QB/T 1715-1993 Bicycle handlebars

This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle handlebars (hereinafter referred to as "handlebars"). This standard applies to bicycle handlebars for general use as specified in Article 4.2 of QB1714 "Bicycle Naming and Model Compilation Method". This standard does not apply to BMX, MTB and ATB handlebars. QB/T 1715-1993 Bicycle Handlebars QB/T1715-1993 Standard download decompression password: www.bzxz.net

1 Subject Content and Scope of Application
Industry Standard of the People's Republic of China
Bicycle
QB/T1715-93
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle handlebars (hereinafter referred to as "handlebars"). This standard applies to bicycle handlebars for general use as specified in Article 4.2 of QB1714 "Bicycle Naming and Model Compilation Method".
This standard does not apply to BMX, MTB and ATB handlebars. 2 Reference standards~
GB2828
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB2829
Counting sampling procedures and sampling tables for periodic inspection (applicable to inspection of production process stability) GB3565
GB12742
Bicycle safety requirements
Technical conditions for bicycle testing equipment and instruments QB/T1217 Technical conditions for bicycle electroplating
QB/T1218
QB1220
3 Terms and symbols
3.1 Terms
Technical conditions for bicycle paint
Metric threads and gauges for bicycles
3.1.1 Fixed handlebars
The handlebar cross tube and handlebar stem are non-adjustable structures. 3.1.2 Combined handlebar
The crossbar tube and stem tube are adjustable structures. 3.1.3 Handlebar body
Combined welded parts of crossbar tube, stem tube and handlebar joint. 3.1.4 Stem tube body
Combined welded parts of stem tube and handlebar joint or combined welded parts of stem tube, handlebar joint and crossbar tube. 3.2 Symbols
The following symbols are used in handlebar standards.
G——Fixed handlebar
Z—Combined handlebar
P Flat handlebar
Q—Crank handlebar
Approved by the Ministry of Light Industry of the People's Republic of China on April 15, 1993 and implemented on December 1, 1993
C—Drop handlebar
4 Product classification
4.1 Types of handlebars
The types of handlebars are shown in Table 1.
Handlebar type
Fixed handlebar
Combined handlebar
4.2 Handlebar type and main parameters
4.2.1 Fixed flat handlebar (GP)
a. See Figure 1 for a type example:
b. See Table 2 for main parameters.
1-Front brake handle,
QB/T1715-93
3-Core washer:
2-Right brake spring,
7-Core screw rod8-Left pull plate,
13-Handlebar joint;
18-Bracket nut
14-Standpipe,
9-Left brake spring;
15-Short pull rod
4-Right pull plate,
10 - Rear brake handle,
Type code
5 Short tie rod joint,
6 A core nut #
11-Handlebar cross tube,
12-Handle cover
16-Handlebar bracket
17 Bracket washer,
360~520
4.2.2 Fixed tilt handle (GQ)
Type example see Figure 2:
b. Main parameters see Table 3.
1-Handlebar cross tube:
7 A vertical tube
450~700
2 A core washer:
4.2.3 Combined flat handle (ZP)
a. Type example see Figure 8
b. Main parameters see Table 4.
QB/T1715-—93
3-core nut;
1-joint,
5-set,
6-core screw rod,
QB/T1715—93
1-core washer;3-core nut;4-set,5-core screw rod,6-vertical tube;7-joint horizontal tube,2-
450~700
4.2.4 Combined handlebar (ZQ)
a. See Figure 4 for the type example,
b. See Table 5 for the main parameters.
One horizontal tube,
One core washer, 3One core nut,
One sleeve:
One core screw rod, 6One vertical tube, One connector B
450~700
4.2.5 Combined drooping handle (ZC)
a. See Figure 5 for the type example;
b. See Table 6 for the main parameters.
1 Handle cover:
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2 Handle cover (wrapped with tape):
6-Handle core nut;
360~420
7-Handle core screw rod;
4.3 Types and basic parameters of some parts of the handlebar 8
3-Handle cross tube;
&Standpipe,
4-Joint cross tube;
9-Handle core pad diagram
5-Joint:
4.3.1 Handle core screw rod
4.3.1.1 Hexagon handle core screw rod
a. See Figure 6 for the type example;
b. See Table 7 for the basic number.
4.3.1.2 Hexagon handle core screw rod
a. See Figure 7 for the type example;
b. See Table 7 for the basic parameters.
QB/T1715—93
External hexagon handle screw
Internal hexagon handle screw
QB/T1715—93
M8x1--6g
M8×1—6g
Handle screw 1 is 10~15mm larger than the handlebar stem H. 4.3.2 Handle nut
The type and basic parameters of the conical handle nut are shown in Figure 8. 4.3.2.2
The type and basic parameters of the wedge-shaped handle nut are shown in Figure 9. M8×1-6H
4.4 Product marking
4.4.1 Composition
M8x1-6H
The product marking consists of technical characteristics (type code, main technical parameters: B×H) and standard number. 4.4.2 Marking example
Fixed flat handlebar with a crossbar width of 500mm and a stem height of 230mm: 10—
GP500×230
QB/T1715
5 Technical requirements
5.1 Accuracy requirements
5.1.1 Fitting accuracy
QB/T1715—93
5.1.1.1 The outer diameter of the stem is 022±0.08. 5.1.1.2 The thread M8×16g/6H shall comply with the provisions of Articles 3.1, 3.2, 3.3 and 3.4 of QB1220. 5.1.2 Roundness of the crossbar bend
The roundness tolerance of the crossbar bend is 2mm. 5.1.3 Height deviation of handlebar tube
Height deviation of left and right ends of handlebar tube: fixed handlebar shall not exceed 5mm; combined handlebar shall not exceed 7mm. 5.2 Safety mark
The handlebar tube shall have a safety line. Its requirements shall comply with the provisions of Article 6.2 of GB3565. The length of the safety line shall not be less than half of the outer circumference of the handlebar tube.
5.3 Strength requirements
5.3.1 Static load of handlebar
The force applied to both ends of the handlebar tube: 490N for drop handlebars and 392N for other handlebars. After 1 minute, the permanent deformation shall be: fixed handlebar shall not exceed 2mm, and combined handlebar shall not exceed 8mm. 5.3.2 Stem tube torque
The stem tube torque shall comply with the provisions of Article 6.5 of GB3565. 5.3.3 Static load of stem tube
The static load of stem tube shall comply with the provisions of Article 6.5 of GB3565. 5.3.4 Torque of cross tube and stem tube
The torque of cross tube and stem tube shall comply with the provisions of Article 6.5 of GB3565. 5.3.5 Torque of stem tube and front fork stem tube
The torque of stem tube and front fork stem tube shall comply with the provisions of Article 6.5 of GB3565. 5.3.6 Vibration test
Fix the specified code at both ends of the handlebar and conduct the vibration test according to the conditions specified in Table 8. No part of the handlebar should be displaced or broken.
Code quality
Maximum
Acceleration at the vibration part
G (m/s*)
Vibration frequency
Number of vibrations
For handlebars with a handlebar tube tilted up more than 200mm: handlebars with a handlebar stem height of more than 280mm; handlebars with a handlebar tube width (B) of more than 600mm, the magnetic code mass is 7kg, and the other conditions are as specified in Table 8. Breaking torque of handlebar core screw
QB/T1715—93
The breaking torque of the handlebar core screw should be no less than 27N·m. 5.3.8 Pull-off force of grip on handlebar tube
The pull-off force of grip on handlebar tube shall comply with the provisions of Article 6.1 of GB3565. 5.4 Electroplating requirements
The electroplated parts of handlebar body and brake lever of fixed handlebar, and handlebar tube and stem tube of modular handlebar shall comply with the provisions of "chrome-plated Class I parts" in QB/T1217, and the other electroplated parts shall comply with the provisions of "chrome-plated Class III parts". All "chrome-plated Class I parts" shall be assessed, and "chrome-plated Class III parts" shall be assessed in accordance with the provisions of Articles 5.4.1 and 5.4.4. 5.4.1 Appearance of electroplated parts
The appearance quality of electroplated parts shall comply with the provisions of Article 5.1.1 of QB/T1217. 5.4.2 Surface roughness of chrome-plated parts
The surface roughness of chrome-plated parts shall comply with the provisions of Article 5.2.1 of QB/T1217. 5.4.3 Thickness of chrome layer
The thickness of chrome layer of chrome-plated parts shall comply with the provisions of Article 5.3.1 of QB/T1217. 5.4.4 Anti-corrosion ability of chrome-plated parts
The anti-corrosion ability of chrome-plated parts shall comply with the provisions of Article 5.4.1 of QB/T1217. 5.5 Paint requirements
Painted parts shall comply with the provisions of "Painted Class I Parts" in QB/T1218. 5.5.1 Appearance of paint film
The appearance quality of paint film shall comply with the provisions of Articles 4.1.1 and 4.1.2 of QB/T1218. 5.5.2 Impact strength of paint filmbzxz.net
The impact strength of paint film shall comply with the provisions of Article 4.2 of QB/T1218. 5.5.3 Anti-corrosion ability of paint film
The anti-corrosion ability of paint film shall comply with the provisions of Article 4.3 of QB/T1218. 5.5.4 Paint film hardness
The paint film hardness shall comply with the provisions of Article 4.4 of QB/T1218. 5.6 Appearance requirements
5.6.1 The exposed parts of the handlebars shall not have sharp edges and obvious scratches, bumps, indentations and other defects. 5.6.2 The trademark stamp and safety mark shall be clear and complete. 6 Test methods
The testing equipment and instruments used in this chapter shall comply with the requirements specified in GB12742. 6.1 Accuracy test
6.1.1 Fit accuracy
6.1.1.1 The outer diameter of the stem
The outer diameter of the stem is measured with a special card plate. The special card plate is shown in Appendix A (Supplement). 6.1.1.2 Thread accuracy
The thread accuracy is measured with a thread gauge. The gauge requirements shall comply with the provisions of QB1220. . . The through-end thread ring gauge and plug gauge should be able to pass smoothly; 12
QB/1715—93
b. The stop-end thread ring gauge and plug gauge shall not pass, and the allowable screwing amount shall not exceed 2 pitches; c. The through-end smooth gauge shall be able to pass smoothly; d. The stop-end smooth gauge shall not pass.
6.1.2 Roundness of the handlebar tube bend
Use a vernier caliper to measure the outer diameter of the left and right bends of the handlebar tube, and measure two values ​​on the same section. The difference between the maximum and minimum values ​​is the roundness error.
The data obtained at the left and right places shall be based on the maximum value. 6.1.3 Height deviation of the handlebar tube
Tighten the handlebar stem on a special fixture (as shown in Figure 10), and use a dial indicator to measure the height deviation of the handlebar tube at 40mm from the end face at both ends of the handlebar tube. The difference between the two values ​​is the height deviation of the handlebar tube. Figure
6.2 Safety mark
Use a steel ruler to measure the distance from the safety line to the bottom of the handlebar. The length of the safety line is measured with a special card. The special card should not completely cover the safety line. See Appendix B (Supplement) for the special card.
6.3 Strength test
6.3.1 Static load test of handlebar
As shown in Figure 11, insert the handlebar to the safety mark and fix it. First, apply the specified force at 40mm at one end of the handlebar. After 1min, remove the force and measure the permanent deformation with a dial indicator. Then repeat the test at the other end. The maximum value of the two values ​​shall prevail. The measurement position is 30mm from the end of the handlebar.
When testing the New-fit handlebar, the force-applying part of the handlebar should be in a horizontal position.
Safety mark
6.3.2 Stem torque test
QB/T1715--93
The stem torque test shall be in accordance with the provisions of Article 24.1.1 of GB3565. The time is 30s. 6.3.3 Static load test of stem
The static load test of stem shall be in accordance with the provisions of Article 24.1.2 of GB3565. The time is 30s. 6.3.4 Torque test of cross tube and stem
The torque test of cross tube and stem shall be in accordance with the provisions of Article 24.2 of GB3565, and the time is 30s. 6.3.5 Torque test of stem and front fork stem The torque test of stem and front fork stem shall be in accordance with the provisions of Article 24.3 of GB3565, and the time is 30s. 6.3.6 Vibration test
Insert the handlebar stem into the vibration test bench at an angle of 70° in the use state and clamp it at the safety mark. Then, as shown in Figure 12, fix the specified code at 40mm from the left and right ends of the handlebar cross tube. Perform the vibration test according to the conditions specified in Article 5.3.6 and visually inspect it.
During the test, the relationship between the maximum acceleration of the vibration part and the vibration frequency and amplitude is as follows: g=0.04an2
Where: g acceleration, G,
a-half amplitude, cm
Vibration frequency, H2.
Safety mark
During the test, the vibration frequency starts from 6Hz. Avoid the resonance area.
6.3.7 Handlebar screw breaking torque test
As shown in Figure 13, insert the handlebar with the handlebar screw and handlebar nut into the special fixture at the safety mark, apply a force of 27N·m to the handlebar screw, and the handlebar screw should not break.
6.3.8 Pull-off force test of the handlebar sleeve on the handlebar cross tube After the handlebar sleeve and the handlebar cross tube are assembled, the pull-off force test is carried out as shown in Figure 14, and the handlebar sleeve and the handlebar cross tube should not be separated. 6.4 Electroplating test
The following test piece parts are not tested:
&. The cover of the handlebar sleeve, the strap or the sheath, the bracket gasket, and the core gasket;
b. Below the safety line of the handlebar stem;
c. The threaded and square milled part of the end of the brake handle,
d. Within 5mm on both sides of the corners;
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e: The matching part between the combined handlebar cross tube and the handlebar joint.
6.4.1 Appearance of electroplated parts
The test method for the appearance of electroplated parts shall comply with the provisions of Article 5.1.2 of QB/T
6.4.2 Surface roughness of chrome-plated parts
The test method for the surface roughness of chrome-plated parts shall comply with the provisions of Article 5.2.2 of QB/T1217.
Measurement location:
a. Four symmetrical points on the left and right sides of the handlebar cross tube;
b. Take a point on the handlebar stem;
c. Take a point each at the bend and straight part of the brake handle: d. Take a point on the flat surface of the handlebar joint.
6.4.3 Thickness of chromium layer
-mrmym
The test method for the thickness of chromium layer of electroplated parts shall comply with the provisions of Article 5.3.2 of QB/T1217. 6.4.4 Anti-corrosion ability of chrome-plated parts
The test method for the anti-corrosion ability of chrome-plated parts shall comply with the provisions of Article 5.4.2 of QB/T1217. Calculation of electroplating area: Except for the part not to be tested, the rest of the handlebar is the tested area. The approximate formula is: Yuan D, (L-100×2) + Yuan D, (L-55) + πDLs Where: L, -
-handlebar tube unfolded length, mm;
handlebar stem tube height, mm
-brake handle unfolded length, mm;
-handlebar tube outer diameter, mm;
D,-handlebar stem outer diameter, mm;
6.5 Paint test
-brake handle outer diameter, m.
6.5.1 Paint film appearance
The test method for paint film appearance shall comply with the provisions of Article 5.1 of QB/T1218. 6.5.2 Paint film impact strength
The test method for paint film impact strength shall comply with the provisions of Article 5.2 of QB/T1218. Test location: measure one point on the handlebar tube and the stem tube. Impact location: handlebar tube and stem tube except abe in 6.4.5.3 Paint film corrosion resistance
The test method for paint film corrosion resistance shall comply with the provisions of Article 5.3 of QB/T1218, and the test location is the same as Article 6.4. 6.5.4 Paint film hardness
The test method for paint film hardness shall comply with the provisions of Article 5.4 of QB/T1218. The test location is the same as Article 6.5.2.
6.6 Appearance test
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