This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle brakes (hereinafter referred to as "brakes"). This standard applies to brakes for general bicycles. QB/T 1720-1993 Bicycle Brakes QB/T1720-1993 Standard download decompression password: www.bzxz.net

Subject content and scope of application
Industry Standard of the People's Republic of China
Bicycle brake
QB/T1720-93
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bicycle brakes (hereinafter referred to as "brakes"). This standard applies to brakes for general bicycles. 2 Reference standards
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB2828
Counting sampling procedures and sampling tables for periodic inspection (applicable to inspection of production process stability) GB2829
GB3565
GB12742
Bicycle safety requirements
Technical conditions for bicycle testing equipment and instruments Technical conditions for bicycle electroplating
QB/ T1217
Technical conditions for surface oxidation treatment of bicycles
QB/T1219
QB1220
QB1221
3Product categories
Metric threads and gauges for bicycles
Inch threads and gauges for bicycles
3.1 Basic types and part names
3.1.1 Rod-type expansion brake
3.1.1.1 For the front axle, see Figure 1.
2 For the rear axle, see Figure 2.
For the front brake, see Figure 3.
For the rear brake, see Figure 4.
3.1.2 Line-type expansion brake
For the front axle, see Figure 5.
For the rear axle, see Figure 6.
For the front brake, see Figure 7.
The example of the rear gate is shown in Figure 8.
Approved by the Ministry of Light Industry of the People's Republic of China on April 15, 1993 and implemented on December 1, 1993
— 61 -
1-tension spring,
6-front brake support plate,
11-axle bowl,
16-left axle stopper;
2-fixed axle:
7-front support plate clamp;
12-front axle stick;
QB/T1720-93
3-external expansion spacer,
8-lock nut
13-front axle housing,
4-inner expansion brake plate;
9-auxiliary stopper;
14-a sleeve:
17-adjusting washer,
:18-front smell box cover,19-slider
5 expansion Brake shoe;
10--dust cover,
15-front brake rocker arm:
20-eccentric shaft
1-rear support plate clamp;
6-slider,
11-adjusting washer;
16-rear axle stick;
QB/T1720——93
2-rear brake support plate;
7-inner brake piece;
12-left shaft stop,
17-shaft bowl;
3-fixed shaft
8-outer brake piece;
4-tension spring,
5-eccentric shaft
9- Brake pad, 10-rear brake box cover,
13-rear brake rocker arm; 14-sleeve;
18-dust cover,
19 shaft stopper,
15-rear axle housing;
20-lock nut
QB/T1720--93
1-purple brake screw;
2-pull pipe upper joint
3-front pull pipe;
4-pull pipe lower joint;
5-front gate plate;
6-pull rod joint 3
7 bent gate plate;
8-cover plate,
9-front pull rod;
10 top Column;
11-adjusting seat
QB/T1720-93
1-tension spring;
QB/T1720-93
2-brake pad support shaft,
3-external brake pad;
6-front brake support plate,
7-front support plate clamp,
11-axle bowl,
16-left axle block,
21-eccentric shaft
12-front axle stick;
17-adjusting washer;
8-lock nut;
13-front axle housing,
4-inner brake pad:||tt| |9-shaft stopper,
14-a set of pipes;
5-expansion brake skin;
10-dust cover;
15-front brake rocker arm;
18--front brake box cover;19-rope pipe positioning screw, 20-slider; Figure 5
1-rear support plate clamp #
6-slider;
11-adjusting pad,
16-rear axle stick;
QB/T1720——93
10/11/12/13
2-rear south support plate,
3-fixed shaft
4-tension spring;||tt| |7-inner brake disc; 8-outer brake disc,
12-left shaft stopper;
17-shaft bowl,
5-eccentric shaft,
9-brake skin; 10-rear brake box cover;
13-rear brake rocker arm; 14-a sleeve;
18-dust cover;
19-shaft stopper,
15-rear axle housing,
20-lock nut
1-rope sheath;
5-front brake handle (right brake handle);
9-stop phase,
QB/T1720--93
2 positioning sleeve;||tt| |8 front brake handle (right brake handle) bracket:
6-bracket clamp ring; 7-steel rope lower joint
10-lock nut;
11-adjusting screw:
4-steel rope upper joint,
8-steel rope:
12-steel rope sleeve
1-rear brake handle (left brake handle),
5-steel rope sleeve sheath;
9-adjusting screw:
13-steel rope lower joint
QB/T1720—93bzxz.net
2-steel rope upper joint: 3-rear brake handle (left brake handle) bracket; 4-positioning sleeve 6-bracket clamp ring:
10- —Lock nut,
7—Rope clamp;
11—Rope positioning column:
8—Rope sleeve,
12—Rope:
3.2 Type dimensions and specifications
QB/T1720-93
3.2.1 For the type dimensions and specifications of the front axle, see Figure 9 and Table 1.
M10x1-6g
B0.379-26-6g6c
Number of holes on the axle housing
36, 32, 28
QB/T1720—93
3.2.2 For the type dimensions and specifications of the rear axle, see Figure 10 and Table 2. Figure
M10×1
6gB0.379-26-6g6e
Note: 110, 22 are preferred size. Meter
-6gB1.375-24-6g
Shaft housing bar
40, 36, 28
QB/T1720--93
3.2.3 For the size of the rod-type front brake, see Figure 11 and Table 8. Figure 11
≥30 (single side)
≥45 (double side)
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.