JB/T 7020.2-1993 Brake arm disc brake brake block JB/T7020.2-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Brake arm disc brake
1 Subject content and scope of application
Brake block
JB/T 7020.2- 93||tt ||This standard specifies the type, size, technical requirements and inspection rules of brake arm disc brake pads. This standard is applicable to brake pads for brake arm disc brakes (hereinafter referred to as brake pads). 2 Reference standards
GB9439 gray cast iron parts
JB/T 7020.1
brake arm disc brake
JB/T7020.3 brake arm disc brake Lining potential 3 types and sizes
3.1 type
According to the connection method between the brake pad and the brake pad, the brake pad is divided into the following three types (see Figure 1): aA type|| tt | ;The brake block and the brake lining are connected with bolts and tightened with the pressure plate bolts: -The brake block and the brake lining are connected with bolts. 3.2 Brake pad dimensions
The dimensions of type A and B brake pads are shown in Figure 1 and Table 1, and the dimensions of type C brake pads are shown in Figure 1 and Table 2. 3.3 Marking
Model indication Method:
Effective friction area of ??the brake pad connected to the brake pad Ap4cm Product code
Marking example:
Effective friction area of ??the brake pad (hereinafter referred to as the effective friction area) The mark of the 108cm2 type B brake pad is: brake pad B108JB/T7020.2-93
3.4 ??The brake pad and the brake pad are connected to form a body, which is called the brake pad assembly. Its assembly types are divided into three types: ZA type, ZB type and ZC type, as shown in Figure 2.
The Ministry of Machinery Industry of the People's Republic of China approved on 1993-09-21 and implemented on 1994-07-01
153
151
JB/T 7020.2 ---93|| tt||5Vf—6
3
Type A
Picture
2xd,
Through hole
JB/T 7020.2-93
Type B
2Xds
Type C
continued picture 1bzxz.net
2i5l. bu bsl
153.
cm
108
177
270
434
710
Ap
cm
108|| tt||177
270
434
710
A
cm?
66
177||tt ||A
cm
66
156
brake disc diameter
d2
315,355
400|| tt||400
4.5o
500,560
630
630.710
800
800
900||tt ||1000
$15
10
15
15
55
door
85
100
130
brake disc diameter
de
315+400
500:630
630:710||tt| |800
bis
h6
A
de
(H9)
25
2||tt| |40
45
55
6.5
7.5
9.5
12.5
de
( H9)
20
25
E1
(-8. .)
177
227
283| |tt||359
455
1
90
3
170
210
250||tt ||4 hearts
JB/T 7020.2- 93
table
a14
50
70
75
85
100
positive
F3
O
150
200
±0.05)
130
214
C12
150
E
38
20
20
25| |tt||30
M8
n
it
M12
M14
7. 9
7.9| |tt||Table 2
20
(±0.2)
140
157
230
15
Ri
30
40
45
5
5.5
55
89
115| |tt||125
b
(h12)
80
100
150
190
Ra| |tt||65
85
100
130
15
4 out
M8
Mla|| tt||a
5,
71
91
181
35
35
ak||tt ||45
65
60
110
130
3
79
119
149
189
mm
h
30
4
60
90
reference weight
kg.
0.06
0.06
0.08
0.08
10
15
10| |tt|||110
4.5
8.5
11.5
20
2
mm||tt ||5
Reference Weight
KE
1.2
4 Technical Requirements
4.1 Materials
Type ZA
JB /T 7020.2--93
ZB type
1 brake block:; 2-brake pad, 3-pressure plate; 4-fastening bolt; 5 washer: 6-steel back; 7—Connecting bolts
Figure 2 Schematic diagram of brake pad assembly
The brake pad material adopts mechanical properties not less than HT200 specified in GB9439. 4.2 Quality requirements
ZC type|| tt||4.2.1 Castings shall not have internal defects such as pores and sand inclusions that may affect performance, and shall not have obvious external cracks and surface defects such as sand sticking and flying spurs. Internal stress should be eliminated before mechanical processing. 4.2.2 The anti-rust treatment of smooth parts and the painting treatment of non-processed surfaces shall comply with the relevant provisions of Article 4.6 of JB/T7020.1. 4.2.3 The connection between the brake block and the brake pad should be firm and reliable, and should not be loose. The gap between the brake pad and the steel backing of the brake pad should be less than 0.15mm.
4.2.4 There should be the model mark specified in Article 3.3 on the obvious part of the brake pad. 5 Inspection Rules
5.1 Factory Inspection
5.1.1 Each brake pad shall be subject to factory inspection by the production quality inspection department in accordance with the provisions of this standard. Only after passing the inspection can it be shipped from the factory, with a product qualification certificate certificate.
5.1.2 Factory inspection items and inspection methods are as follows: a. Brake pad materials should comply with Section 4. of this standard.1; b. Use universal measuring tools and fixtures to inspect the dimensions with tolerance requirements in Table 1 and Table 2 and the relevant provisions in Articles 4.2.1 and 4.2.3; c. Use the national measurement method to inspect the relevant appearance quality in Articles 4.2.1 and 4.2.4; 137
JB/T7020.2
93
d. Inspect the relevant items of Article 4.2.2 according to the relevant provisions and methods of JB/T7020.1; e. Article 4.2.3 of this standard can be inspected by the method of Article 5.3.4 of JB/T7020.1. 5.1.3 All factory inspection items of brake pads must be qualified. 5.2 Type inspection
5.2.1 Type inspection items include all technical contents of Chapter 3 and Chapter 4 of this standard. 5.2.2. The type inspection and sampling methods refer to the relevant provisions of Article 6.2 of JB/T7020.1. Additional Notes:
This standard was proposed and managed by the Beijing Hoisting and Conveying Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Taiyuan Heavy Machinery College. The main drafters of this standard are Tang Feng, Hua Xiaoyang, Song Yanjun, and Wu Jinggang. 1.8
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