This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of wheeled engineering machinery service brake system caliper disc brakes. This standard applies to caliper disc brakes (hereinafter referred to as brakes) of service brake systems of wheeled construction machinery such as loaders, scrapers, graders and dump trucks. JB/T 5948-1991 Technical conditions for caliper disc brakes of engineering machinery JB/T5948-1991 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Construction Machinery Clamp Disc Brake
Technical Conditions
1 Subject Content and Scope of Application
JB/T 594891
This The standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of wheeled construction machinery service brake system caliper disc brakes.
This standard applies to caliper disc brakes of service brake systems of wheeled T-range machinery such as loaders, scrapers, graders and dump trucks (hereinafter referred to as brakes).
2 reference standards
JB3935
Automobile brake performance requirements
J13/T 5937
JB/T 5938
JB/T 5944
General technical conditions for gray iron castings in engineering machinery
General technical conditions for ductile iron castings
General technical conditions for heat-treated parts
General technical conditions for heat-treated parts
JB/ T 5936
Construction machinery
General technical conditions for machined parts
JB/T5945
GB 5763
GBn 257
Construction machinery assembly General technical conditions
Automotive brake pads
Automotive brake linings (supplementary provisions for appearance, friction performance and impact strength) JB2805 Automobile brake bench test method JB8 product label
JB/T5947 Engineering Machinery
General Technical Conditions for Packaging
GB2828 Batch-by-Batch Inspection and Counting Sampling Procedures and Sampling Tables (Applicable to Continuous Batch Inspection) 3 Technical Requirements
Brake products should comply with this According to the provisions of the standard, it shall be manufactured according to the product drawings and technical spare parts approved by the prescribed procedures. If there are special requirements, it shall be implemented according to the agreement between the user and the manufacturer. 3.1 Performance requirements
3.1.1 When the initial braking speed of the first, second and third brake effectiveness tests is 20km/h, and the brake pipeline pressure is the maximum value specified by the manufacturer, the braking torque output by the brake Should not be less than the rated value. 3.1.2 In the first, second and third efficiency tests, the difference between the braking torque output by the brake when the initial braking speed is 40km/h and the braking torque output when the initial speed is 20km/h is expressed as a percentage. calculated, should not be greater than 10%. 3.1.3 Other performance requirements of the brake should comply with the relevant provisions of JB3935, performance requirements table 1. 3.2 Materials
The raw materials used in the brake should have the official mark and certificate of the manufacturer. The manufacturer should conduct random inspections and confirm that they are qualified before use.
The Ministry of Mechanical and Electronic Industry of the People's Republic of China approved the implementation on 1992-07-01 on 12-12-1992
197
3.3 accessories and purchased parts
JB/T 5948--91
The accessories and purchased parts used in the brake must have product certificates; the manufacturer should conduct random inspections and confirm that they are qualified before assembly Table 1
Serial number
4|| tt||5
F
8
In the table:
th running-in
item
at a=.30km/ h, 0.30g (or corresponding brake line pressure) when t disc ≤ 100℃
first performance
at u= pn mx,UabZxz.net
-th recession Recovery
20km/h
40km/h 15 times at 0.45g (or corresponding brake line pressure)
20km/h, 10 times
Second Secondary performance
at =po maxn=20 km/h
Second decay
at 0.07g (or corresponding brake line pressure) 20 km/h, 18 Second time (fluid>hour
Second running-in
At "\.30g (or corresponding brake line pressure) 1100 hours
Second performance
At = pa Working surface
c, clamp
d. Brake pad
c. Cylinder (cylinder)
M-Rated braking torque of the brake, M= M×80%, N·m performance index
The number of running-in when the contact area reaches 80%=.500 timesMnaMe
4(40-20),- (M2-M)-M2 X100X ≤110% retreat rate=(M,)mz-
(M)mu+(M,)mawX100
Recovery rate: [(M)-(Ma)ma→(M)x× 100% regression rate 25%
recovery rate 120%
M22Mm
4(40-20)2:(M2M)+M2X10010%!
recession Rate = [(M/p)max—(M./)u-(M/p)mx×100%
Reduction rate 60%
Grind 50 times (manual polishing is not allowed) )
Maa=Mm
A(40-20), (M\2-M\40)+M\2m ×100%= 110A=times=(Mmax—Mmin)+Mtmx X100 %V2Ax≤30% 244-≤35%
a, after all tests, the operation should be normal
b. There should be no scratch marks
c. There should be no impact on braking performance Deformation
d. Intact, no delamination, slight cracks allowed, and firmly attached to the brake pad backing plate
c. No oil leakage is allowed
M-.--braking torque of the brake (which is the friction coefficient u0.35 or the calculated value during design), N·m; initial braking speed.km/h| |tt||t.-Brake disc temperature, ℃
--The maximum pipeline pressure specified by the manufacturer.MPa; pc ax
Mal, Maz, Mas—one is the first time respectively , during the second and third efficiency tests, the initial braking speed is 20km/h. When the brake line pressure is the maximum value specified by the manufacturer, the braking torque output by the brake (average braking torque), N· m; 198
JB/T5948--91
4 (40-20)., △ (40-20) 2 △ (40-20) 3--respectively: times, During the second and third efficiency tests, the difference between the braking torque output by the brake when the initial braking speed is 40km/h and the braking torque output by the brake when the initial speed is 20km/h, N·m:
Man, Mf4a.M2n.M, M\2, M\s are the first, second and first efficiency tests respectively. The initial braking speed is 20km.h and 40km respectively. /h. When the brake line pressure is the maximum value specified by the manufacturer, the braking torque output by the brake is N?m;
The maximum value of the braking torque in 15 times of fade braking, N·m (M .) nax ---
(Ma)mmn
Recovery error rate
3.4 ??castings
Minimum value of braking torque in 15 times of fade braking, N+ m Recovery In the 10-time recovery test, the difference between the maximum braking torque and the braking force with the same brake line pressure in the first efficiency test (A.):
3.4.1 Gray iron castings must comply with the technical requirements of the drawings and shall comply with the relevant provisions of JB/T5937. 3.4.2 Ductile iron castings must comply with the technical requirements of the drawings and shall comply with the relevant provisions of JB/T5938. 3.5 Machined parts
must comply with the technical requirements of the drawings and shall comply with the relevant provisions of JB/T5936. The technical requirements for the main parts of the main parts of the brake are shown in Appendix A (Supplement). 3.6 Heat-treated parts
must comply with the technical requirements of the drawings and shall comply with the relevant provisions of JB/T5944. 3.7 Friction lining
must comply with the technical requirements of the drawing, and shall comply with the relevant regulations of GB5763 and GBn257. 3.8 Assembly
must comply with the technical requirements of the drawing. And should comply with the relevant provisions of JB/T5945. 3.9 Appearance
3.9.1 The non-machined surface of castings should be smooth and free of sand and spurs. 3.9.2 The surface should be painted evenly, and there should be no signs of sagging, missing or wrinkled skin, etc. 3.10 Sealing performance
3.10.1 Static pressure test
The oil pressure is the oil pressure used by the brake assembly on the main engine (when the brake is used on different main engines, the maximum operating oil pressure is used) multiplied by 1.3 times. There should be no leakage in any part of the static pressure test for 3 minutes. , the pressure drop does not exceed 0.3MPa, 3.10.2 There is no leakage after a 1000h test with the host. 3.11 Reliability
Mean time between failures (MTBF) three 400h. 4 Test method
4.1 Performance test
4.1.1 For the first, second, and third performance tests, the initial braking speeds are 10, 20, 30.40.50km/h (each Increase 10km, h is -. level) to the maximum speed.
4.1.2 When conducting the first, second and third efficiency tests, the oil pressure used by the brake under test was 4.9011.80MFa, with each increase! --The level is 0.98 MPa.
4.1.3 Before the first fade test, the initial speeds are 20km/h and 40km/h respectively. When the initial temperature of the brake disc is 65C+5C, adjust the input The line pressure causes the deceleration to reach 0.45g. 4.1.4 For the second fade test, the initial braking speed is 20km/h. 4.1.5 During the brake bench test, the inertia of the vehicle with the largest brake usage is used as the test inertia. See Appendix B (Supplement) for the calculation method of the rotational inertia. The bench test records and reports are shown in Appendix C (reference part). 199
JB/T 5948-91
4.1.6 Other brake tests shall be carried out in accordance with the provisions of JB2805. 4.2 Reliability test
A 1000h test and assessment is carried out along with the host machine to assess its average trouble-free working time. T | | tt | —Total working time, h,
N--The total number of faults that occur during the total working time. 4.3 Other requirements shall be tested in accordance with Articles 3.2~3.9. 5 Inspection Category
Inspection is divided into outgoing inspection and type testing. 5.1 Factory inspection
5.1.1 Each brake shall undergo factory inspection before leaving the factory. The manufacturer's inspection department shall conduct inspection and acceptance according to the drawings, relevant technical documents and the provisions of this standard. Products must be accompanied by a certificate of conformity when leaving the factory. 5.1.2 Factory inspection items
Assembly quality:
a.
b.
c.
d.
Appearance quality;
Tight sealing;
Packaging quality.
5.2 Type test
5.2.1 Type test should be approved by the industry quality inspection department. Type testing must be carried out in case of the following circumstances: 5.2.2
a.
b.
c.
d.
New When the product is trial-produced;
When the structure, process or materials are changed enough to affect the performance of the brake; mass-produced products are type tested every four years: when the national quality supervision agency puts forward the requirement for type testing. Type test items:
5.2.3 pad
a.
h.
d.
brake performance;
reliability;
All factory inspection items:
Inspection of main components
5.2.4 Product sampling
Product sampling shall be carried out in accordance with the provisions of GB2828
5.2.4.1 Sampling method
Products are sampled without notifying the company in advance. Random sampling is used among the products in the user or manufacturer's database. The products are sealed immediately after sampling and are not allowed to be adjusted, modified or replaced. 5.2.4.2 Inspection Level
Use special inspection level S-3.
5.2.4.3 Sampling quantity N
Bench test of brake performance shall be conducted from batch range N=9-~15 samples in Taichung. Inspection of other items is sampled from batch range N91150 Taichung. There is no limit to the size of N when sampling among users. 5.2.4.4 Sample code and sample size 200
JB/T 5948-91
This standard stipulates that the sample size code for bench performance test is A, and the sample size n is 2, that is, the sample size is 2 brakes were used for bench performance testing. The sample size code for inspection of other items is specified as C, and the sample size is n-5, that is, 5 brakes are selected for inspection of other items. 6 Marking, packaging, transportation and storage
6.1 Mark
6.1.1 The brake plate should be fixed on a visible part, and the plate should comply with the provisions of JB8. 6.1.2 The plate includes the following content:||tt ||Manufacturer name and factory logo;
a
h. Product name and model;
c.
d.
Cylinder diameter, effective braking radius and rated operating pressure; production number and year of manufacture.
6.2 packaging
6.2.1
6.2.2
6.2.3
6.2.4
a.||tt| |b.
Product packaging should comply with the relevant regulations of JB/T5947. Product packaging should be moisture-proof and rust-proof. The oil inlet and air bleed nozzle should have oil-resistant plugs and protective covers. When each product leaves the factory, it should be accompanied by the following technical documents: product factory certificate;
self-recorded accessories and spare parts.
The outer wall of the packaging box should be marked with the following:
6.2.5
a.
b.
c.
d.| |tt||t.
f.
g.
Product model and name;
Product factory number and year, month and day of manufacture;
Manufacturing Name and address;
Receiving unit and address;
Gross weight and net weight;
Name of shipping and arrival station (port);
Transportation and storage mark.
6.3 Transportation and Storage
When transporting and storing products, measures should be taken to prevent rain and moisture. 7Quality Guarantee Period
Under the premise that the user complies with the storage and use requirements, within 12 months from the date of delivery from the manufacturer (based on the date of delivery invoice), if the product is damaged due to manufacturing quality or material defects If the product is damaged or fails to work properly, the manufacturer shall promptly repair or replace the product free of charge. 201
JB/T5948
Appendix A
91
Technical requirements for main parts of main parts
(Supplementary parts)
A1 Main The technical requirements for the main parts of the parts are shown in Table A1. Part name
Clamp body
Live
Zhai
Split pump cover
Mounting pad
Neck
1. Hydraulic cylinder bore size accuracy
2. Hydraulic cylinder bore surface roughness
3. Verticality between the hydraulic cylinder hole and the mounting surface
Table A1
Object
4. Dimensional accuracy of the connecting hole of the fixed friction tree block 1. Dimensional accuracy of piston diameter
2. Ru value of piston outer surface roughness
1. Dimensional accuracy of matching diameter of cylinder cover and hydraulic cylinder 2. Dimensional accuracy of ○-shaped sealing groove||tt| |Parallelism of both end faces of the friction pad
Appendix B
Calculation method of slow rotation
(Supplement)
B1 Calculation of moment of inertia
B1. 1 When both front wheels are tested for brakes at the same time, the calculation formula is as follows: IαGiBr-2
Where: 1Qi
The moment of inertia when both front wheels are tested for brakes at the same time, N·m2G---empty Front axle load in loading and transportation position, N; tire rolling radius, m;
β--front axle load transfer coefficient during no-load braking. B1.2 When only a single front wheel brake is tested, the calculation formula is as follows: GiBre
I
Where: I--
The moment of inertia when only a single front wheel brake is tested , N·m2. h
β=1+§
where: mountain - road adhesion coefficient;;
hg
b-
202||tt| |Height of center of gravity at unloaded transport position, m;
Distance between center of gravity and rear axle, m.
Require
Ask
Conform to the drawing
IT?
0.8 μm
IT7
Conform to the drawing||tt| |Not human in 0.04um
Prepare
Note
Integral clamp
Integral clamp
(131)
(B2)||tt ||3)
c
Models
JB/T5948-91
Appendix C
Bench test records and reports
( Reference parts)
For the recording paper format and the format for drawing each curve, see the JB2805 appendix complete machine parameters and brake parameter table
manufacturer
machine quality in unloaded transportation position
Tire model
Axle load distribution:
Unladen transport position, front
Fully loaded transport position, front
Center of gravity height: Unladen transport position
When fully loaded transport position
Center of gravity position: Distance from the rear axle when unloaded transport position Distance from the rear axle when fully loaded transport position
Wheelbase
Brake type: front||tt ||Brake manufacturer
Brake drive mode: front
Brake wheel cylinder diameter: front
Maximum brake line pressure
Front and rear axle braking force ratio|| tt||Rated braking torque: front
rear
friction material grade
vibration between friction pad and brake disc: front
rear||tt| |Brake fluid grade
Additional instructions:
Manufacturing date
Manufacturer
Manufacturer
Rolling radius
N||tt ||m
After
After
After
After
After
Year and month of manufacture
Maximum speed,| |tt||Date of manufacture
Date of manufacture
This standard is proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Mechanical and Electronic Industry. This standard is drafted by Tianjin Engineering Machinery Research Institute, Yingkou Engineering Machinery Clutch Factory, and Xuzhou Engineering Machinery Bridge Box Factory. The main drafters of this standard are Yang Xiuwen, Chen Shurong and Wang Zhongru. kg
m
N
N
m
m
m
m
km/ h
MPa
N?m
Nm
mm
203
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