GB/T 3478.7-2008_English: PDF (GB/T3478.7-2008)
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Straight cylindrical involute splines - Metric module, side fit. 37.5-degreepressure angle M and W values
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Straight cylindrical involute splines 37. 5 Degree pressure angle--M and W values
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| Standard ID | GB/T 3478.7-2008 (GB/T 3478.7-2008) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J18 | | Classification of International Standard | 21.120.30 | | Word Count Estimation | 93,971 | | Date of Issue | 2008-09-22 | | Date of Implementation | 2009-05-01 | | Older Standard (superseded by this standard) | GB/T 3478.7-1995 | | Quoted Standard | GB/T 321; GB/T 3478.1 | | Drafting Organization | Productivity Promotion Center in the machine | | Administrative Organization | National Standardization Technical Committee axis machines and accessories | | Regulation (derived from) | National Standard Approval Announcement 2008 No.16 (Total No.129) | | Summary | This standard specifies the pressure angle of 37. 5 �� sleepy column straight involute splines M value (bar spacing MRi, cross bar from MRe and W values ??(external splines normal line average length > formula and limit the size of the table this section applies by GB/T 3478. 1 design and manufacture of pressure angle of 37. 5 �� involute splines. |
GB/T 3478.7-2008
Straight cylindrical involute splines.Metric module, side fit.37.5-degreepressure angle M and W values
ICS 21.120.30
J18
National Standards of People's Republic of China
Replacing GB/T 3478.7-1995
Straight cylindrical involute splines
(Metric series of teeth with the side)
Part 7. 37.5 ° pressure angle M and W values
2008-09-22 released
2009-05-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China
China National Standardization Management Committee released
Preface
GB/T 3478 "cylindrical straight teeth involute spline (metric series of teeth with the side)" is divided into nine parts.
- Part 1. General;
- Part 2. 30 ° pressure angle dimension table;
- Part 3. 37.5 ° pressure angle dimension table;
- Part 4. 45 ° pressure angle dimension table;
- Part 5. Inspection;
- Part 6. 30 ° pressure angle M and W;
- Part 7. 37.5 ° Pressure angle M and W;
- Part 8. 45 ° pressure angle M and W;
Part 9. Measuring rods.
This part is part 7 of GB/T 3478.
This part refers to ISO 4156-2..2005 "Cylindrical Straight Tooth Spline Spline (Metric Modulus Tooth Side) Part 2. Dimensions"
About 37.5 ° pressure angle M value and W value, is the GB/T 3478.7-1995 "cylindrical straight teeth involute spline 37.5 ° pressure angle M value
And W value ".
The main differences between this part and GB/T 3478.7-1995 are as follows.
--- standard name from the "cylindrical straight teeth involute spline 37.5 ° pressure angle M value and W value" to "cylindrical straight involute spline
(Metric Modulus Tooth Side) Part 7. 37.5 ° Pressure Angle M Value and W Value ";
--- modified the original standard of the error, according to GB/T 1.1 made editorial changes.
This part of the national machinery shaft and accessories standardization technical committee put forward and centralized.
This part of the drafting unit. in the machine productivity promotion center, Harbin Dongan engine manufacturing company, Shijiazhuang sprocket factory, China second
Machinery Group Corporation, Taiyuan Heavy Industry Co., Ltd.
This part of the main drafters. Ming Cui new, often treasure India, Xu Wenjiang, Tan Ren Wan, Wang Xiaoling, Deng Gao see.
This part of the previous version of the standard to replace the release of the situation.
--- GB/T 3478.7-1995.
Straight cylindrical involute splines
(Metric series of teeth with the side)
Part 7. 37.5 ° pressure angle M and W values
1 range
This part of GB/T 3478 specifies the M value of the involute spline of the cylindrical straight teeth with a pressure angle of 37.5 ° (rod spacing MRi,
MRe) and W value (the average length of the spline normal line) and the limit size table.
This part is applicable to involute splines with a pressure angle of 37.5 ° manufactured and manufactured according to GB/T 3478.1.
2 normative reference documents
The terms of this document are the terms of this part by reference to this part of GB/T 3478. Any reference to the date of the text
, All subsequent amendments (excluding corrigenda) or revisions do not apply to this part, however, encouragement under this section
The parties to the agreement study whether the latest versions of these files are available. For undated references, the latest edition of this document applies
section.
GB/T 321 priority and priority series
GB/T 3478.1 Cylindrical straight teeth involute splines (metric series of teeth with side) Part 1. General (GB/T 3478.1-
2008, ISO 4156-1..2005, MOD)
3 bar measurement of the size of the formula
Note. Allow the corresponding steel ball instead of the bar.
3.1 Calculation formula for measuring the size of internal spline bar
Figure 1
D'Ri = Db [tanαci-tan (αci-EmaxD + invαci-inv37.5 °
)] (1)
Where.
D'Ri - the calculated diameter of the bar;
Αci - the pressure angle on the spline and the rod contact point, expressed in radians, αci = cos-1
Db
Dci
Dci --- internal spline and measuring rod at the point of contact diameter.
Dci = Deemax + Dimin2
Deemax --- the maximum size of the external spline;
Dimin --- minimum value of internal spline trails;
Emax --- the actual maximum cogging width, the table by the tolerance level of 7 values.
Invαci = tanαci-αci;
Inv37.5 ° = 0.1128285.
The rod diameter DRi is selected according to R40 in GB/T 321. If D'Ri is not the R40 series value, it should be selected to be the closest to D'Ri
The value.
Figure 2
Even teeth.
MRimax = Dbcosαimax-
DRi (2)
MRimin = Dbcosαimin-
DRi (3)
Odd teeth.
MRimax = Dbcosαimax ×
Cos90 ° z-DRi
(4)
MRimin = Dbcosαimin ×
Cos90 ° z-DRi
(5)
Where.
MRimax --- the maximum value of the spline bar spacing;
MRimin - the minimum value of the spline bar spacing;
Αimax --- When E is Emax, the internal pressure on the center circle of the pressure bar.
Invαimax = EmaxD + inv37.5 ° -
DRi
Db
Αimin --- When E is Emin, the internal pressure on the center circle of the internal pressure bar.
Invαimin = EminD + inv37.5 ° -
DRi
Db
DRi - internal spline bar diameter.
3.2 Calculation formula for measuring the size of external spline bar
Figure 3
D'Re = Db [tan (αce + invαce + πz-
Smin
D -inv37.5 °
) -tanαce] (6)
Where.
D'Re - the calculated diameter of the bar;
Αce - the pressure angle on the outer spline and the rod contact point, expressed in radians, αce = cos-1
Db
Dce
Dce --- outside the splines and measuring rods at the point of contact.
Dce = Deemax + Dimin2
Smin --- the actual minimum tooth thickness, the table by tolerance level 7 and the basic deviation of h value.
Invαce = tanαce-αce.
The rod diameter DRe is selected according to R40 in GB/T 321. If D'Re is not the value of R40 series, the closest to D'Re should be selected.
value.
Figure 4
Even teeth.
MRemin = Dbcosαemin +
DRe (7)
MRemax = Dbcosαemax +
DRe (8)
Odd teeth.
MRemin = Dbcosαemin ×
Cos90 ° z + DRe
(9)
MRemax = Dbcosαemax ×
Cos90 ° z + DRe
(10)
Where.
MRemin - the minimum value of the spline span of the spline;
MRemax - the maximum value of the spline span between the outer splines;
Αemin --- When S is Smin, the pressure angle on the center circle of the external spline bar.
Invαemin = DReDb +
Inv37.5 ° + SminD -
Αemax - when S is Smax, the pressure angle on the center circle of the external spline bar.
Invαemax = DReDb +
Inv37.5 ° + SmaxD -
DRe - outside the spline with the diameter of the rod.
4 The formula for the average length W of the outer spikes (see Figure 5)
Figure 5
Wmax = Wmin + Tcos37.5 ° (12)
Where.
Wmin --- the average length of the common line of the minimum;
Wmax --- the maximum length of the average length of the common law;
K - number of teeth, K = 1.25 z/6 + 0.5 (take integer);
(T + λ) --- total tolerance;
T --- processing tolerances;
Esv --- the role of tooth thickness on the deviation.
5 bar measurement size
5.1 Measuring the size of the internal spline
Modulus of 0.5mm ~ 10mm, the number of teeth 10 to 100, the tolerance level of 4 to 7, the basic deviation of the h of the internal spline measurement with the amount of stick
Diameter DRi, maximum rod spacing MRimax and minimum MRimin See Table 1 to Table 14.
5.2 Measuring the size of the outer spline
5.2.1 The amount of the outer spline is 0.5mm ~ 10mm, the number of teeth is 10 ~ 100, the tolerance level is 4 ~ 7, the basic deviation is h
Rod diameter DRe, minimum value of span distance MRemin and max MRemax see Table 15 to Table 28.
5.2.2 When the basic deviation of the spline is not h, the span distance shall be calculated according to the formula listed in 3.2.2 or calculated according to the following formula
After the difference ΔMRe, the span value in the table is corrected.
ΔMRe = Ke · esv (13)
5.3 The rod diameter DRi and DRe listed in Tables 1 to 28 are determined according to 3.1.1 and 3.2.1. If necessary, make a number on the bar
Plane to avoid contact with the spline trails.
5.4 When the actual selection of the rod diameter and the diameter listed in the standard are different, the maximum distance between the spline rod spacing MRimax and the minimum
MRimin, the minimum value of the spline span distance MRemin and the maximum value MRemax, should be calculated according to the actual rod diameter.
6 km normal length W limit value
6.1 Modulus 0.5mm ~ 10mm, the number of teeth 10 ~ 100, the tolerance level of 4 to 7, the basic deviation of h outside the average length of the normal length of the horn
Degrees W limit values, see Table 29 to Table 42.
6.2 When the basic deviation of the external spline tooth thickness is not h, the difference ΔW of the average length of its common line is calculated as follows.
ΔW = esv · cos 37.5 ° = 0.793esv (14)
Number of teeth
Diameter bar
DRi
Emin and Emax Rod Distance MRi
4H 5H 6H 7H
Min max min max min max min max
1.00
1.00
1.00
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
3.277
3.750
4.313
4.587
5.142
5.616
6.161
6.635
7.174
7.649
8.183
8.659
9.190
9.668
10.195
10.502
11.028
11.509
12.033
12.515
13.037
13.520
14.041
14.525
15.044
15.529
16.047
16.532
17.049
17.535
18.051
18.538
19.053
19.540
20.055
20.543
21.057
21.545
22.058
22.547
23.060
23.549
24.061
24.550
25.062
25.552
3.306
3.775
4.337
4.612
5.167
5.639
6.184
6.657
7.196
7.671
8.205
8.681
9.211
9.689
10.217
10.523
11.049
11.530
12.054
12.536
13.058
13.541
14.062
14.546
15.065
15.549
16.067
16.553
17.070
17.556
18.072
18.559
19.074
19.561
20.076
20.563
21.077
21.565
22.079
22.567
23.080
23.569
24.081
24.571
25.082
25.572
3.288
3.760
4.322
4.597
5.152
5.625
6.170
6.644
7.182
7.657
8.192
8.668
9.199
9.676
10.204
10.511
11.037
11.518......
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