GB/T 13552-2023_English: PDF (GB/T13552-2023)
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Automotive V-ribbed belts
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Standard ID | GB/T 13552-2023 (GB/T13552-2023) | Description (Translated English) | Automotive V-ribbed belts | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | G42 | Classification of International Standard | 21.220.10 | Word Count Estimation | 8,863 | Date of Issue | 2023-09-07 | Date of Implementation | 2024-04-01 | Older Standard (superseded by this standard) | GB/T 13552-2008 | Drafting Organization | Zhejiang Fengmao Technology Co., Ltd., Wuxi Belt Tape Co., Ltd., Ningbo Kaichi Tape Co., Ltd., Ningbo Jaguar Transmission System Co., Ltd., Shaoxing Huafangyuan Transmission Technology Co., Ltd., Qingdao Product Quality Inspection Research Institute | Administrative Organization | National Technical Committee on Standardization of Pulleys and Belts (SAC/TC 428) | Proposing organization | China Petroleum and Chemical Industry Federation | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Standard ID | GB 13552-2008 (GB13552-2008) | Description (Translated English) | [GB/T 13552-2008] Automotive V-ribbed belts | Sector / Industry | National Standard | Classification of Chinese Standard | G42 | Classification of International Standard | 21.220.10 | Word Count Estimation | 18,144 | Date of Issue | 2008-12-30 | Date of Implementation | 2009-12-01 | Older Standard (superseded by this standard) | GB 13552-1998 | Adopted Standard | ISO 9981-1998, NEQ; ISO 11749-1995, NEQ | Drafting Organization | Volkswagen Rubber Co., Ltd., Guizhou | Administrative Organization | China Petroleum and Chemical Industry Association | Regulation (derived from) | Announcement of Newly Approved National Standards No. 21 of 2008 (No. 134 overall) | Proposing organization | China Petroleum and Chemical Industry Association | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This Chinese standard specifies the car Ribbed (hereinafter referred to as band) product classification, requirements, test methods, inspection rules, marking, packaging, storage and transportation. This standard applies to automobile engine fans, motors, pumps, compressors, power steering pump, turbocharger and other transmission with belt. | Standard ID | GB 13552-1998 (GB13552-1998) | Description (Translated English) | Automotive V-ribbed belts | Sector / Industry | National Standard | Classification of Chinese Standard | G42 | Classification of International Standard | 83.140.01 | Word Count Estimation | 12,135 | Date of Issue | 1998/10/19 | Date of Implementation | 1999/4/1 | Older Standard (superseded by this standard) | GB 13552-1992 | Quoted Standard | GB/T 17516.2-1998 | Adopted Standard | ISO/DIS 9981-1997, MOD; ISO 11749-1996, MOD; JASO E109-1994, MOD | Regulation (derived from) | Announcement of Newly Approved National Standards 2008 No. 21 (No. 134 overall) | Proposing organization | The former Ministry of Chemical Industry of the People Republic of China | Issuing agency(ies) | State Quality and Technical Supervision |
GB/T 13552-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.220.10
CCS G 42
Replacing GB/T 13552-2008
Automotive V-ribbed belts
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Structure ... 6
5 Model and marking ... 6
6 Cross-sectional dimensions ... 7
7 Requirements ... 7
8 Test methods ... 8
9 Inspection rules ... 9
10 Signs, labels, packaging, storage and transportation ... 10
Automotive V-ribbed belts
1 Scope
This document specifies the structure, model and marking, cross-sectional dimensions,
requirements, test methods, inspection rules, signs, labels, packaging, storage and
transportation of automotive V-ribbed belts (hereinafter referred to as "V-ribbed belts").
This document applies to V-ribbed belts for transmission of fans, motors, water pumps,
compressors, power steering pumps, superchargers, etc. of automobile internal
combustion engines.
This document does not apply to elastic V-ribbed belts.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 3686, V-belts -- Tensile strength and elongation test method
GB/T 6931.1, Belt drives -- Vocabulary -- Part 1: Basic vocabulary
GB/T 6931.2, Belt drives -- Vocabulary -- Part 2: V-belts and V-ribbed belt drives
GB/T 10715, Belt drives -- V-ribbed belts, joined V-belts and V-belts including wide
section belts and hexagonal belts -- Electrical conductivity of antistatic belts:
Characteristics and methods of test
GB/T 17516.2, V-and ribbed belts drive. Dynamic test to determine pitch zone
location. Part 2: V-ribbed belts
GB/T 33513, Belt drives -- Pulleys and V-ribbed belts for the automotive industry -
- PK profile: Dimensions
GB/T 41947, Belt drives -- V-ribbed belts for the automotive industry -- Fatigue test
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 6931.1,
GB/T 6931.2 apply.
7.6 Antistatic properties
The antistatic properties of V-ribbed belts with antistatic requirements shall comply
with the requirements of GB/T 10715.
8 Test methods
8.1 Appearance
Check the appearance of the V-ribbed belt by visual inspection.
8.2 Size
The effective line difference of V-ribbed belt is measured according to the provisions
of GB/T 17516.2. The exposed height and effective length limit deviation of the V-
ribbed belt are measured in accordance with the provisions of GB/T 33513.
8.3 Tensile property test
The tensile strength and reference force elongation of V-ribbed belts are tested in
accordance with the provisions of GB/T 3686.
8.4 Low temperature resistance performance test
8.4.1 Specimen
The number of specimens is 3. Taken from the same sample tape. Cut a strip with a
length of not less than 250 mm as a specimen. If 3 specimens cannot be taken from one
sample belt, 3 specimens can be taken from the same model and batch of products, but
this shall be noted in the test report.
8.4.2 Test procedures
For ordinary V-ribbed belts, the specimens are pretreated at a temperature of (100±2)℃
for . The specimen is then cooled to room temperature and kept at (-30±1)°C for
. For heat-resistant V-ribbed belts, pretreat the specimens for at a
temperature of (120±2)°C. The specimen is then cooled to room temperature and kept
at a temperature of (-40±1)°C for . After taking it out, immediately conduct
bending tests on the corresponding cylinders according to the requirements of
Condition A and Condition B in Table 2. The bending arc must be at least 90°.
8.5 Fatigue life test
The length of the V-ribbed belt is based on the actual usage conditions or as agreed
between the supplier and the purchaser. Use a two-wheel, three-wheel or four-wheel
fatigue testing machine to conduct fatigue life testing in accordance with the provisions
of GB/T 41947.
8.6 Antistatic performance test
The antistatic performance of V-ribbed belts is tested in accordance with the provisions
of GB/T 10715.
9 Inspection rules
9.1 Exit-factory inspection
9.1.1 V-ribbed belts must be inspected by the manufacturer's quality inspection
department and issued with a certificate before leaving the factory.
9.1.2 The exit-factory inspection items of V-ribbed belts include appearance, size and
tensile properties.
9.1.3 V-ribbed belts shall be visually inspected one by one.
9.1.4 For the size of the V-ribbed belt, at least 3 shall be measured for each mold, and
1 shall be taken from the head, middle and tail. If one of them is unqualified, the molded
V-ribbed belt shall be fully inspected.
9.1.5 The number of V-ribbed belts of the same material shall not exceed 50,000 in one
batch. Sufficient samples shall be taken from each batch of products for tensile property
testing. If the monthly output is less than 50,000 pieces, inspection will be conducted
once a month. If the party has special requirements, relevant inspections can be decided
through negotiation between the supplier and the purchaser.
9.2 Type inspection
9.2.1 V-ribbed belts shall undergo type inspection at least once every six months. When
one of the following conditions occurs, type inspection shall be carried out.
a) During the trial production of new products or the finalization and appraisal of
old products for production transfer;
b) When the product is resumed after 2 years of discontinuation;
c) After the product is officially produced, if there are major changes in structure,
materials, and processes, it may affect product performance;
d) When the national market supervision and administration department puts
forward requirements for type inspection.
9.2.2 The type inspection items of V-ribbed belts shall include all items in Chapter 7.
9.3 Determination rules
9.3.1 Exit-factory inspection
9.3.1.1 If one or both of the appearance and dimensions of the V-ribbed belt do not meet
the requirements of this document, the product will be judged as unqualified.
9.3.1.2 If the tensile properties of the V-ribbed belt do not meet the requirements of this
document, double the number of specimens from the batch of V-ribbed belt products
shall be taken for re-inspection. If the re-inspection result is still unqualified, the batch
of products will be judged as unqualified products.
9.3.2 Type inspection
9.3.2.1 The appearance and size determination of V-ribbed belts shall be carried out in
accordance with 9.3.1.1.
9.3.2.2 If the tensile properties, low temperature resistance, fatigue life and antistatic
properties of the V-ribbed belt do not meet the requirements of this document, double
the number of specimens will be taken from the batch of V-ribbed belt products, and
the unqualified items and related items will be reinspected. If one or more of the re-
inspection results are still unqualified, the batch of products will be judged as
unqualified.
10 Signs, labels, packaging, storage and transportation
10.1 Signs
Each V-ribbed belt shall be clearly marked and shall at least include the following:
a) Mark;
b) Manufacturer's name or trademark or supplier code;
c) Year and month of manufacture or batch number.
10.2 Labels and packaging
......
GB 13552-2008
Automotive V-ribbed belts
ICS 21.220.10
G42
National Standards of People's Republic of China
Replacing GB 13552-1998
Automotive V-ribbed belts
(ISO 9981.1998Beltdrives-PuleysandV-ribbedbeltsfortheautomotive
industry-PKprofile. Dimensions, NEQ; ISO 11749.1995Beltdrive-V-ribbed
beltsfortheautomotiveindustry-Fatiguetest, NEQ)
Posted 2008-12-30
2009-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
4.2 This standard is mandatory, the rest are recommended.
This standard corresponds to ISO 9981.1998 "Automotive V-ribbed belts and belt drive pulley --- --- PK Type. Size" and ISO 11749.1995
"Belt drive V-ribbed belts for the automotive industry --- --- fatigue test," this standard and ISO 9981.1998 and ISO 11749.1995 conformance Cheng
Degree is not equivalent.
This standard replaces GB 13552-1998 "car V-ribbed belt."
This standard and ISO 9981.1998 and ISO 11749.1995 The main differences are as follows.
--- According to Japan Automobile Manufacturers Association standards JASOE109.1994 "Automotive ribbed belts" to increase the effective length limit deviation, wedge high
The reference value, the wedge angle, exposing the height measurement;
--- According JASOE109.1994 increase three fatigue tester power transmission belt, tension, fatigue life;
--- JASOE109 by.1994 increases the tensile properties of the belt, low temperature performance, visual quality;
--- Increased inspection rules, marking, packaging, transportation and storage.
This standard compared with GB 13552-1998 main changes are as follows.
--- Tightened the effective length limit deviation (1998 version 4.5.4, this version 3.5.4);
--- Increasing the specific requirements of the fatigue test equipment, while increasing the test procedure two test machines and equipment specific to
Request (see A.2, A.4.2.1.2);
--- The ribbed belt fatigue test indicators from the 50h to 80h (1998 edition 5.2, this version 4.2);
--- The ribbed belt fatigue testing by the body to Appendix A (1998 edition 6.2, this version of Appendix A).
Appendix A of this standard is a normative appendix.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee and the friction belt drive with pulleys Technical Committee (SAC/TC428/SC3) centralized.
This standard was drafted. Guizhou public Rubber Co., Ltd. in Hangzhou Kim Tae tape, Zijingang Belt Co., Ltd., Ningbo
Lush Far East Rubber Co., Ltd., no Xibeierte Tape Co., Northwestern Polytechnical University, Qingdao Rubber Industry Research Institute.
The main drafters of this standard. SNOW Wei, Song Hui Yan, Wang Jinfang, Chen Hai, Zeng Jun, You Jianping, Li Shujun, Hand deep, Deng Ping, Xu?.
This standard replaces the standards previously issued as follows.
--- GB 13552-1992, GB 13552-1998.
Automotive V-ribbed belts
1 Scope
This standard specifies the automotive ribbed belt (hereinafter referred to as belt) product classification, requirements, test methods, inspection rules, marking, packaging, storage and transportation.
This standard applies to cars with an internal combustion engine fans, motors, pumps, compressors, power steering pumps, turbochargers and other transmission belts.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 11357 pulley material, surface roughness and the balance (GB/T 11357-1989, eqv ISO 254. 1981)
Dynamic test methods - Part 2 GB/T 17516.2 V and ribbed belt drives to determine pitch position. V-ribbed belt
(GB/T 17516.2-1998, idt ISO 8370-2.1993)
3 shape and size and raw material requirements
3.1 Model
With models used to represent the cross-sectional shape and size. Cars generally use PK ribbed belt model.
3.2 specification, markings
Dimensional characteristics include automotive V-ribbed belt with a wedge number, model and the effective length of the following numbers and letters are marked.
a) The first group of numbers represents the number of wedge belt;
b) a group of letters represents the model;
c) a second set of numbers represents the effective length in millimeters.
Example.
Effective length (mm )
PK
band model
with several wedge
3.3 shape and structure
Automotive V-ribbed belt is an endless belt 1 shown in cross section in FIG.
3.4 Material
3.4.1 Rubber
Adhesive rubber composition and the wedge should be uniform.
3.4.2 belt back fabric
Using cotton fibers, synthetic fibers or blended fibers woven into the fabric as a band backing fabric. The warp and weft density
It should be uniform and free from defects and distortion.
1 --- back with fabric;
2 --- tensile body;
3 --- adhesive;
4 --- plastic wedge.
Chart 1 V-ribbed belt
3.4.3 tensile body
Adopt a cord made of synthetic fibers, which should be uniform twist.
3.5 Dimensions
3.5.1 cross-sectional dimension
With a reference value of the cross-sectional dimension as shown in FIG. 2 and Table 1.
Figure 2 is a cross-sectional band
Sectional dimensions in Table 1 millimeter band
Name Size
Wedge from Pb 3.56
Wedge angle α 40 °
Note. The table wedge distance and with high value for reference only. Wedge cumulative pitch tolerance is an important indicator, but it is often subject to mold belt tension at work and tension member
The amount of influence.
3.5.2 Effective line differential and highly exposed
Effective line with the difference in height and is exposed as shown in Figure 3. Exposed height by 5.1 method were determined by the difference between the effective line GB/T 17516.2
The measurement method is measured. Effective line height difference between the exposed and the nominal value and the limit deviation by the supply and demand sides through consultation.
Chou e --- effective line differential;
Chou o --- exposed height.
Figure 3 cross-sectional position
3.5.3 The minimum diameter of the pulley
In order to achieve the desired service life of belt, the pulley diameter should be not less than the values in Table 2.
Table 2 Minimum wheel diameter in millimeters
Project forward bending backward bending
The effective diameter of 55 -
Outer diameter - 85
3.5.4 Limit deviation of effective length
With an effective length of the length said, according to the method of 5.1 was measured. The effective length of 10mm should normally be an integral multiple of its pole
Limit deviation As shown in Table 3.
Table 3. Limit deviation unit effective length in mm
Limit deviation of effective length Le
≤1000 ± 5.0
> 1000, ≤1200 ± 6.0
> 1200, ≤1500 ± 8.0
> 1500, ≤2000 ± 9.0
> 2000, ≤2500 ± 10.0
> 2500, ≤3000 ± 11.0
Note. When the effective length is greater than 3000mm, its limit is determined by the deviation of manufacturing and consumer consultation band.
4 Requirements
4.1 appearance requirements
With the appearance of the harmful distortion may not have the visual can confirm, skew, cracks, bubbles, foreign matter and other defects.
4.2 Fatigue Life
Based on actual usage or agreement by both parties, the choice of two, three or four wheeled bench press machine in Appendix A method of measuring tape
Fatigue life. Upon reaching a predetermined operating time of the test, take the phenomenon can not be damaged as shown in FIG. Should not be lower than fatigue life
4.3 Tensile Properties
Tensile properties with the test method according to 5.3, the tensile strength and elongation of the reference force should be consistent with Table 4.
Table 4 Tensile Properties
Number wedge tensile strength/kN Reference force elongation /% reference force/kN
3 ≥2.40
4 ≥3.20
5 ≥4.00
6 ≥4.80
7 above ≥0.8 × state
≤3.0
0.75
1.00
1.25
1.50
0.25 × shape
Note. the number of wedge-shaped belt.
4.4 Low temperature resistance
Low temperature resistance with a test method in accordance with 5.3, after the test shall not bring cracks.
4 appearance defects
5 Test methods
5.1 length and height measurements exposed
5.1.1 means
The effective length of the belt is a belt mounted on the measuring device consists of the following components of the measurement, as shown in FIG.
Figure 5 is exposed length and height measuring device
5.1.1.1 two pulleys of the same diameter, one of which is fixed and the other is movable. Pulley wheel groove cross-section of the two pulleys with a ruler
Inch shall comply with Figure 6 and Table 5, recommended with an effective diameter can be determined depending on the amount given in Table 6.
FIG. 6 a sectional view of the groove
5.1.1.2 urging means is applied to the movable pulley for measuring the total force.
5.1.1.3 measuring device for measuring a center distance of the two pulleys.
5.1.2 Measuring Force
Measuring force to measure the effective length of the belt shall be applied in accordance with Table 6.
Table 5 PK type pulley wheel groove dimensions in millimeters
Item Limit deviation of a predetermined value
Measuring pulley groove angle αc ± 0 ° 15 '40 °
Operation and practical test pulley pulley groove angle αc ± 1 ° 40 °
2 x0 nominal value 0.99
2Nd maximum 1.68
The angle between the axis of the pulley groove center line c shall be 90 ° ± 0.5 °.
dN nominal value has nothing to do with the pulley diameter, it is from the tank into the measuring wheel contact point ball (or column) to the measuring wheel groove ball (or column) outer edge
Radial distance between.
Table 6 and the measuring force measuring pulleys
Item Value
Pulley effective perimeter Ue (the effective diameter endpoint)/mm 300
Ball (or column) at the outer edge of the pulley diameter K/mm 96.48 ± 0.13
Each wedge measuring force F/N 100
5.1.3 Program
When the effective length of the measuring tape, the first tape rotation at least twice, with a wedge of the wheel so that the groove with the good, and to measure the force evenly distributed in two bands
Straight segment. Then measure the two pulley center distance E, and calculated using the formula (1) with an effective length Le and exposed height Chou o.
Le = Emax + Emin + Ue (1)
Where.
Le --- the effective length of the belt;
Ue --- effective circumferential length measuring pulley;
Emax --- pulley center distance maximum;
Emin --- pulley center distance minimum.
Where.
Chou O --- exposed height, in millimeters (mm);
--- With the S values calculated (see Fig. 5), in millimeters (mm).
5.2 Tensile test
5.2.1 Sample
A tape cut from three sections 250mm long as three samples. Apart in the middle of each sample drawn two standard length 100mm
Line for measuring the elongation. If a tape is not cut out three samples, the number of samples by the manufacturer in consultation with the parties and consumers
determine.
5.2.2 Test Procedure
At 25 ℃ ± 5 ℃ environment, on the tensile testing machine for tensile test specimens. A test speed of 50mm/min ± 5mm/min.
When measuring the maximum tensile force to pull off when the sample as tensile strength.
In general, the standard value should be measured three measured values averaged rounded to two decimal places with only the results obtained by.
In the measured value holding portions broken specimens should be discarded, and the same tape and then cut the sample tested to supplement the lack of
measured value.
5.3 Low temperature test
5.3.1 Sample
Press the tape was cut from 5.1 three samples. At a temperature of 100 ℃ ± 2 ℃ the sample is 70 + 2 0h pretreatment.
5.3.2 Program
The sample was cooled to room temperature and placed in a temperature of -30 ℃ ± 1 ℃ issued 70 + 2 0h, immediately after removing them in accordance with Table 7 requires a cylinder
The bending test. The curvature of at least 90 °.
It is determined using a curved condition A2 or B2 according to the state conditions using a curved band in use.
Table 7 bent condition
Item Condition Condition A2 B2
Test chamber temperature/℃ 25 ± 5 25 ± 5
Cylinder diameter/mm 40 70
Forward bending bending direction reverse bend
Note. with the wedge portion inwardly bent said forward bend with wedge curved outward state known as reverse bend.
5.4 Fatigue Test
Fatigue tests carried out in accordance with Appendix A with regulations.
6 Inspection rules
After 6.1 before being shipped by the manufacturer with a quality inspection department inspection, and issue a certificate.
6.2 in each band one by one according to 3.5.4 and 4.1 should test the quality and appearance of the effective length.
Sectional dimension of 6.3 per 1000 extracted a check, tensile properties test performed at least twice a month.
6.4 Low temperature resistance test at least once every quarter.
6.5 pairs of the same model with the same material every two extraction fatigue life test, at least once every six months.
6.6 has failed projects in the 6.3 to 6.5 of the test, the sample should be the other to take a double batch band of failed projects and have
Off project retest, if the test results there is a still unsatisfactory, then the product is defective.
7 Marking, labeling, packaging, transportation and storage
7.1 marks
Each band have clear signs of water washed away, including the following.
a) specification mark;
b) manufacturers and trademarks;
c) the year of manufacture.
7.2 Labeling and Packaging
Each application with paper sleeve and plastic film packaging, each 50-100 with the use of appropriate bags or boxes for packaging, each outer
Shall indicate the manufacturer, trademark, size, number and production date on the package. In bags or boxes should be accompanied with cardboard or plastic film production
Label, on which shall include the following.
a) manufacturer's name or trademark;
b) specification mark;
c) the number of bags or a box zone;
d) year of manufacture;
e) demand side indicated part number;
f) quality inspection departments qualified chapter.
7.3 Transportation, storage
7.3.1 with transportation and storage, avoid direct sunlight and rain and snow Baptist leaching, kept clean to prevent acid, alkali, oil and organic solvents, which are
Exposure to harmful substances with the quality of the storage position of the belt should be away from the heat source device 1m or more, the tape can not be stored by excessive bending and
extrusion.
7.3.2 Storage warehouse temperature should be maintained at -15 ℃ ~ 40 ℃, relative humidity of 50% to 80%.
Appendix A
(Normative)
Belt drive V-ribbed belts for the automotive industry fatigue test
A. 1 Overview
In A. Determination of the conditions laid down by the following operation on the performance with two, three or four test machine 2.1 requirements.
Note 1. The device tests the shortest four V-ribbed belt is 1000mm (see Figure A.1); with a length of 800mm to 1000mm V-ribbed belt in three test machine
The test (see Figure A.2); shorter belt to be tested (see Figure A.3) on two test machines, as shown in Table A. 1.
Note. The angle between the plane of the plane with a pulley mounted on the pulley with the center determined should be adjusted to ± 15 '.
a45 ° angle is the size of the testing process may be due to the belt tension again and change the test begins.
Figure A. 1 four test machine arrangement
Table A. Claim 1 running test strip
The effective length of the wedge with a number of test equipment belt/mm
Three tester 3800 to 1000
Four test machine 31000 ~ 1300
Note. The angle between the plane of the plane with a pulley mounted on the pulley with the center determined should be adjusted to ± 15 '.
a45 ° angle is the size of the testing process may be due to the belt tension again and change the test begins.
Figure A. 2 three test machine arrangement
Some test conditions, as the test transmission power, the minimum allowed life (in hours), with the number of re-tensioning, by band
Manufacture party decides in consultation with users.
When the tape no longer satisfies a predetermined condition, namely that the band has expired.
A. 2 devices
A. 2.1 Fatigue Testing Machine
Tester should have a solid structure, all of its members should be able to withstand the stress generated in the test without damage.
The main part of the testing machine as described below (see Figure A.1, A.2 and Figure A.3)
a) a capstan and suitable drive means.
b) a driven wheel and a suitable power absorbing means associated therewith.
c) power absorption device shall be accurate and can be used in an appropriate manner (for example, be corrected with a heavy mound).
d) reverse bending tensioner pulley, only four testing machine (see Figure A.1).
Note. The angle between the plane of the plane with a pulley mounted on the pulley with the center determined should be adjusted to ± 15 '.
Figure A. 3 two tester arrangement
e) bear a direct tension test components.
For three or four test machine, it is a tension pulley (see Figure A.1 and A.2).
On two test machines, it is a movable pulley (see Figure A.3).
f) a sliding device for measuring the amount of tape, measurement accuracy of ± 1%.
Arrangement and direction of rotation of each pulley as shown in A. 1, Figure A. 2 and Figure A. Figure 3.
To enable the test function to adapt to the position of various lengths on the belt, drive pulley and driven pulley, tension pulley and its seating position (for three test
Test machine for) and reverse bending tensioner position (four-wheel testing machines) should be adjusted so that each belt pulley arranged to meet long
Degree required.
To enable a predetermined tension can be desirably added to the belt, and to meet the elongation of the belt, mounted in the cradle (if necessary) and tension
Bearing device should be able to slide freely along the tension lines.
In this case, four-wheel test machine, tension line should be located at each wheel center is located on a flat surface and split ribbed belt tensioner and
Reverse bending angle formed at the tensioner pulley.
In this case on three test machines, the tension on the line of action should be in the plane of each wheel center and split at the ribbed belt tensioner
Forming an angle.
In two test machines, one of the two pulleys (driving wheel or the driven wheel) should be moved to the test function test length 800mm V-belt.
The case shall be equipped with fastening means on the test machine, it can withstand a predetermined tension in the tape fixing the movable pulley position. In order to fit a predetermined tension
Almost requirements applied to the belt, and to meet the elongation zone, tension line should be the center of the driving wheel and the driven wheel axle, and two located
Where the wheel center plane (see Figure A.3).
A. 2.2 Test pulley
Throughout the test wheel pulley groove side surface roughness R Rao (see GB/T 1135) shall not exceed the arithmetic mean of 0.8μm. Test strip
Wheel size requirements shown in Figure A. 4 and Table A. Fig.
Table A. 2 test pulley size in millimeters
Bullets numerical limit deviation
3 slots
Groove angle c 40 ° ± 0 ° 30 '
Effective line differential Chou e 2 nominal value
Measuring ball or cylindrical outer cutting plane parallel to the outer edge of the pulley pitch 2 x0 0.99 -
a means of two adjacent grooves symmetrical deviation distance between the wheel axis.
The angle between the symmetry axis and the axis of the pulley wheel groove c should be 90 ° + 0.5 °.
e only for three or four test machine.
f45mm in ISO 9981 is the minimum recommended value, which can be used for the test; 55mm is recommended for the best value of the actual design.
g only for two tester.
h only for four test machine.
i minimum reverse bending wheel diameter of not more standardized rules. 60mm only test value should not be used for actual transmission.
The actual section j ribbed belt pulley mated diameter slightly larger than the effective diameter of the pulley, the exact value will be used in V-ribbed belt pulley mounted on the running order
Measured, the difference between nominal and effective line value (Chou e = 2mm) can be used to calculate the approximate ratio. When higher accuracy, with the maker should ask.
The formula see GB/T 17516.2-1998.
k on a difference between the measured diameter of the pulley on the grooves should be less than 0.15mm, the diameter of the groove can be used to compare the comparison measurements of each groove ball or cylinder
Exo-plane pitch instead.
A. 3 laboratory conditions
Test ambient temperature should be.
a) the test chamber temperature of 18 ℃ ~ 32 ℃. During the test, the test near the gear may not have come from outside the test transmission
Air stream.
b) the temperature inside the temperature controlled at 85 ℃ ± 5 ℃.
Note 1. radial and axial runout (TIR) value should not exceed 0.25mm, respectively, beating both by means of measuring the pressure in the spring rotation of the pulley
While maintaining good contact with the cam groove ball of radial runout and sensing.
Note 2. R Rao as an indicator of the cam groove surface roughness should be less than 0.8μm. Because in this case, R Rao is one of the main parameters of the test wheel, so the value of R Rao
It is determined to be 0.87. R Rao definitions and measurement methods see GB/T 11357.
Figure A. 4 a cross-sectional groove
A. Test Method 4
A. 4.1 Test conditions
Driving wheel speed is 4900r/min, the speed limit deviation of ± 2%. Three or four wheeled drive power fatigue testing machine with the recommended
(3 wedge calculation) is 8kW, tension is (680 ± 30) N. If users have special requirements can be manufactured and users for 3-5 wedge
Ribbed belt consultation. Specific test conditions calculated by the following formula.
With driving wheel speed to calculate the torque. In the case of a driven wheel speed torque loss not by the sliding band produced to compensate
It should remain constant.
Torque M by the formula (A.1) is given by.
M = Ps × 9545 vp
(A.1)
Where.
M --- torque, in units of Newton meter (N · m);
Ps --- given transmission power, in kilowatts (kW);
Vp --- active wheel speed, in revolutions per minute (r/min).
The test equipment should be properly maintained to minimize the loss of additional load by the bearing and lubrication produced.
A. 4.2 Program
A. 4.2.1 Test preparation
A. 4.2.1.1 Prepare three or four wheeled tester
Method A
Attached to the belt pulley, the tension applied to the test (see A.4.1) on the tension pulley. Tensioner wheel bearing can move freely in the chute love
Start testing machine under conditions so that the transmission reaches a predetermined rotational speed (see A.4.1). Try to quickly apply a predetermined load to the driven wheel, the power absorption
Absorbing predetermined power receiving apparatus. Due let gearing operation under these conditions 5min ± 15s (not including start-up and braking time)
Stop at least 10min.
And then turn the pulley so that ribbed belt drive a few laps, and immediately tensioner bearing a fixed position.
Method B
Attached to the belt pulley, tensioner for applying a tension test (see A.4.1), and tensioner wheel bearing can then move freely in the chute
After the rotation of the pulley by hand to make several turns ribbed belt, tensioner bearings and immediately fixed position.
Note. When using a new test pulley, you should use a non-test with test procedures according to the requirements of run-in at least 48h, and then tested.
A. 4.2.1.2 Prepare two test machines
And press A. 4.2.1.1 The same procedure as the preparation, only one of the "tension wheel bearing" to "movable sheave bearings"
Can.
A. 4.2.2 Test
After the temperature inside temperature reached 85 ℃ ± 5 ℃, start (in A to "restart") test machine, so that the transmission reaches a predetermined rotation
speed. The test load is applied to the driven wheel slip amount measuring tape between the driving wheel and the driven wheel.
Where.
Like o
No
Like t
Nt
Like o --- driven wheel initial rotational speed;
T --- like the driven wheel speed during the test termination;
No --- capstan initial rotational speed;
Nt --- active wheel speed during the test termination.
Where are all the speed test speed under load.
A. 4.2.3 belt tension again
Before belt failure, when the sliding rate of 4% increment, immediately stop the test machine at least 20min (cooled to 15 ℃ ~ 35 ℃),
Then release the tension wheel support (in terms of three or four test), th......
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