Some standard content:
Machinery Industry Standard of the People's Republic of China
Brake Arm Disc Brake
Subject Content and Scope of Application
Brake Pad
JB/T 7020.3 93||tt| |This standard specifies the type, size, technical requirements and inspection rules of brake arm disc brake brake pads. This standard applies to brake pads for brake arm disc brakes (hereinafter referred to as brake pads). 2 Reference standards
GB3700 carbon structural steel
GB1036 Determination method of plastic linear expansion coefficient GB 1041
GB5763
Plastic compression test method
Automotive brakes Lining
Friction material Rockwell hardness test method
GB5766
JB/T7020.1 brake arm disc brake
JB/T7020.2 brake arm disc Type brake
Brake block
JB/T7021.3 block brake brake pad 3 types and sizes
3.1
Type
Regarding the connection method between the dynamic lining and the brake block, the brake lining is divided into three types: A type, B type and C type, as shown in Figure 1. Figure 2 shows the distribution of connecting holes when the B1 type brake pad is pressed with the steel backing. 3.2 Dimensions of brake pads
a. The dimensions of A, and B type brake pads should comply with the requirements in Figure 1 and Table 1; b. The dimensions of Type C brake pads shall comply with the requirements in Figure 1 and Table 2. 3.3 Mark
Model representation method:
Brake lining effective friction area As, cm
Product code
Marking example:
The effective friction area is A108cm, the marking of type brake lining is: brake lining A-108JB/T7020).3---93 Ministry of Machinery Industry of the People's Republic of China Approved on 1993-09-21 and implemented on 1994-07-01||tt ||1.9
160
9PX
JB/T 7020.3-93
.70
Type A
Type B||tt ||Figure 1
Joint seam
Gutter shape
EE cross-section
Start
2-——E view
Picture Smoke
A is 108cm2 and 177cm
JB/T 7020.3-93
[
Type C
Continued Figure 1
A is 270cm2
Figure 2
A
0. 15
4, which is 434cm2 and 710cm2
161
Ap
cmWww.bzxZ.net
108
177
270
434
710
Ap
cm
108| |tt||177
270
341
710
brake disc diameter
d
315
355
400
400
4.50
500
560
630
630
710|| tt||800
800
900
1000
f
(-. )
35
65| |tt||f2
(二1)
46
76
Note: R and r should be appreciated.
162
(-8.3)
89
114
142
180
228
J3
(±:)
79
100
125
158
200
(-8.s )
7.9
7.9
f
JB/T 7020.3---93
Table 1
a4
45
55
55
60
75
45
60
60
60| |tt||80
Average effective
Friction radius
ri
125
144
167.5
159| |tt||182
200
229
265
252
290
337
319||tt ||367
415
ra
h
71
91
111
141
181
155.589.5
198
248
h2
30.5
39
48
61
78
r4
16
112
142
177
313
222| |tt||398
20
25
20
25
2S
36
45||tt ||R
12
80
100
120
150
200
de
140
M6
180
M6
230
M6
32290
40
M8| |tt||370M8
()
15
20
nXd
(n is the number of holes)
8×8| |tt||8x8
10X8
12×10
12×10
min
12
16
mm
115
135
157.5
..
146
171
185
215
250
233
273
318
295
345
395
Reference weight| |tt||kg
0.6
1.0
1.5
3.0)
4.6
1
cm|| tt||66
177
brake disc diameter
d
315;400
500;630
630;710| |tt||800
4 technical requirements
Ho
(=8:2)
130
214
b|| tt||(28:1)
70
110
he
57.5
JB/T 7020.3
Table 2| |tt||12
98
157
4.1 The friction performance of the brake pad should meet the following requirements: 15
The friction coefficient should not be less than 0.36;a.
f
2.5
2.5
93
f
f
8||tt| |f
5
r
150
313
r
6
R.
3.5
b. The wear rate q cannot be greater than 2% when the ratio of the worn mass after 2000 consecutive braking operations to the mass of the brake pad before wear. 4.2. The physical (mechanical) properties of the material should comply with the provisions of Table 3. Table 3
Name
Linear expansion coefficient
Compressive strength
Rockwell hardness
Single
bit
N/ mm
reference
standard
3X105
40
mm
reference weight
kg
0.5
1.6
Measured according to P, M and I. scales, the HR value is 40~90; the hardness difference on the same brake pad does not exceed 6 hardness units
Note: If If there are special requirements, the supply and demand parties will negotiate and determine. 4.3 The steel back material adopts Q235-B steel plate in GB700. 4.4 Manufacturing requirements
4.4.1A, the type brake lining and the steel back are pressed or sintered, and their interconnection is non-detachable. The dovetail groove used in the middle cross section is processed according to the gauge (see A in Figure 1 EE cross-section view). The layout of the grooves is chosen by the manufacturer. 4.4.2 Type B1 brake pad and steel back are pressed, and their interconnection is non-detachable. The layout of the grooves is chosen by the manufacturer. The connection cross-sectional view is shown as type B in Figure 1.
4.4.3 (, type brake lining and steel backing are bonded or sintered, and their interconnection is non-detachable (see type C in Figure 1). 4.5 Friction plane of the brake lining It should be smooth and free of defects such as bubbles, cracks, delamination, obvious impurities, and processing damage. 4.6 The connection between the brake lining and the steel backing must be firm and reliable, and no loosening should occur when the brake lining is worn to the minimum allowable thickness. 5 Test methods
5.1 Brake pad performance test
5.1.1 The physical (mechanical) performance test requirements of the material are as follows: a: Linear expansion coefficient: Carry out in accordance with the test method specified in GB1036: Compressive strength : According to the test method specified in GB1041: b.
c.
Rockwell hardness: According to the test method specified in GB5766 5.1.2 Determination of wear coefficient
According to JB/ The method in Article 5.3.2 of T7020.1 first measures the braking torque, and then calculates the average value of the friction coefficient M M
M
ftd
2Nri2pA according to the following formula. .r
Where: M-
The average braking torque obtained from the test;
. :
2
The number of brake pads;
The total pressure of the brake pad, N=pA
r effective friction radius.rd/2;
p
-specific pressure,
A , effective friction area.
JB/T 7020.3-93
5.1.3 The wear rate shall be carried out in accordance with the wear rate test method specified in GB5763. 6 Inspection Rules
6.1 Factory Inspection||tt ||Each brake lining shall be inspected by the quality inspection department of the manufacturer in accordance with the provisions of this standard. It shall be inspected before leaving the factory and shall be accompanied by a product certificate
6.1.1 General usage quantities. , the dimensions with tolerance requirements in the fixture inspection tables 1 and 2 and the relevant items specified in Article 4.4. 6.1.2 The quality of Article 4.5 shall be checked by visual inspection and knocking. All items of factory inspection must be qualified. . 6.2 Type inspection
6.2.1 Type inspection shall be carried out when one of the following situations occurs: a. When new products are finalized or old products are transferred to the factory for trial production and appraisal; after formal production, the formula of friction material and brake lining When there are major changes in the manufacturing process of the pad, which may affect product performance; b.
When the product has been discontinued for more than two years and is resumed; c.
d. During the normal production process of the product, every two years Conduct a type inspection; when the national quality supervision department proposes type inspection requirements. e. | Select one of the specifications, select at least three specifications for each series, and select at least 2 pairs of brake pads for each specification. 6.2.3 Inspection items
a.
All items of factory inspection;
b. Test all the dimensions in Table 1 and Table 2, and use the method in Article 5.3.4 of JB/T7020.1 to test the firmness and reliability of the connection between the brake pad and the steel backing in Article 4.6 of this standard; c.
d. Test the performance of the brake pad according to the test method in Chapter 5. 6.2.4 All test items of the selected products for inspection must be qualified. If there are any unqualified items, it is allowed to double-select products of the same batch and specifications for re-inspection. All re-inspected products must be qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
The brake pad should be marked with the following content on the non-friction surface: a. Product model:
b． Manufacturing batch number;
c. Manufacturer's name or trademark.
7.2 Packaging
The brake lining should be packed tightly in a moisture-proof, strong box to prevent damage during transportation. The product certificate and instruction manual are included in the box.
7.3 Transportation
During transportation, loading and unloading, bumps and impacts are strictly prohibited, and rain, snow and water must be prevented to prevent damage to the product. 164
7.4 Storage
JB/T7020.3-93
The product should be stored in a clean, ventilated, dry place and protected from rain, snow and water. It should not be stored in Prolonged exposure to sunlight. Additional notes:
This standard is proposed and administered by the Beijing Hoisting and Transport Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Taiyuan Heavy Machinery College. The main drafters of this standard are Tang Feng, Hua Xiaoyang, Song Yanjun, and Wu Jinggang. 165
Relevant items specified in Article 4. 6.1.2 Use visual inspection and knocking method to check the quality of Article 4.5. 6.1.3 All factory inspection items must be qualified. 6.2 Type inspection
6.2.1 Type inspection shall be carried out when one of the following situations occurs: a. When a new product is finalized or an old product is transferred to a factory for trial production and appraisal; after formal production, the formula of friction material and brake lining When there are major changes in the manufacturing process, which may affect product performance; b.
When the product has been discontinued for more than two years and resumes production; c.
d, during the normal production process of the product, every two years A type inspection; when the national quality supervision department proposes type inspection requirements. e.
6.2.2 Sampling method for type inspection
According to the order of specifications of the effective friction area of ??the produced products, one of every two specifications is selected, and at least three specifications are selected from each series. Take at least 2 pairs of brake pads for each specification. 6.2.3 Inspection items
a.
All items of factory inspection;
b. Test all the dimensions in Table 1 and Table 2, and use the method in Article 5.3.4 of JB/T7020.1 to test the firmness and reliability of the connection between the brake pad and the steel backing in Article 4.6 of this standard; c.
d. Test the performance of the brake pad according to the test method in Chapter 5. 6.2.4 All test items of the selected products for inspection must be qualified. If there are any unqualified items, it is allowed to double-select products of the same batch and specifications for re-inspection. All re-inspected products must be qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
The brake pad should be marked with the following content on the non-friction surface: a. Product model:
b． Manufacturing batch number;
c. Manufacturer's name or trademark.
7.2 Packaging
The brake lining should be packed tightly in a moisture-proof, strong box to prevent damage during transportation. The product certificate and instruction manual are included in the box.
7.3 Transportation
During transportation, loading and unloading, bumps and impacts are strictly prohibited, and rain, snow and water must be prevented to prevent damage to the product. 164
7.4 Storage
JB/T7020.3-93
The product should be stored in a clean, ventilated, dry place and protected from rain, snow and water. It should not be stored in Prolonged exposure to sunlight. Additional notes:
This standard is proposed and administered by the Beijing Hoisting and Transport Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Taiyuan Heavy Machinery College. The main drafters of this standard are Tang Feng, Hua Xiaoyang, Song Yanjun, and Wu Jinggang. 165
Relevant items specified in Article 4. 6.1.2 Use visual inspection and knocking method to check the quality of Article 4.5. 6.1.3 All factory inspection items must be qualified. 6.2 Type inspection
6.2.1 Type inspection shall be carried out when one of the following situations occurs: a. When a new product is finalized or an old product is transferred to a factory for trial production and appraisal; after formal production, the formula of friction material and brake lining When there are major changes in the manufacturing process, which may affect product performance; b.
When the product has been discontinued for more than two years and resumes production; c.
d, during the normal production process of the product, every two years A type inspection; when the national quality supervision department proposes type inspection requirements. e.
6.2.2 Sampling method for type inspection
According to the order of specifications of the effective friction area of ??the produced products, one of every two specifications is selected, and at least three specifications are selected from each series. Take at least 2 pairs of brake pads for each specification. 6.2.3 Inspection items
a.
All items of factory inspection;
b. Test all the dimensions in Table 1 and Table 2, and use the method in Article 5.3.4 of JB/T7020.1 to test the firmness and reliability of the connection between the brake pad and the steel backing in Article 4.6 of this standard; c.
d. Test the performance of the brake pad according to the test method in Chapter 5. 6.2.4 All test items of the selected products for inspection must be qualified. If there are any unqualified items, it is allowed to double-select products of the same batch and specifications for re-inspection. All re-inspected products must be qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
The brake pad should be marked with the following content on the non-friction surface: a. Product model:
b． Manufacturing batch number;
c. Manufacturer's name or trademark.
7.2 Packaging
The brake lining should be packed tightly in a moisture-proof, strong box to prevent damage during transportation. The product certificate and instruction manual are included in the box.
7.3 Transportation
During transportation, loading and unloading, bumps and impacts are strictly prohibited, and rain, snow and water must be prevented to prevent damage to the product. 164
7.4 Storage
JB/T7020.3-93
The product should be stored in a clean, ventilated, dry place and protected from rain, snow and water. It should not be stored in Prolonged exposure to sunlight. Additional notes:
This standard is proposed and administered by the Beijing Hoisting and Transport Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Taiyuan Heavy Machinery College. The main drafters of this standard are Tang Feng, Hua Xiaoyang, Song Yanjun, and Wu Jinggang. 165
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