JB/T 5949-1991 English PDF (JBT5949-1991)

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JB/T 5949-1991: Construction machinery shoe brake technical conditions
JB/T 5949-1991
P 97
PROFESSIONAL STANDARD OF THE PEOPLE’S
REPUBLIC OF CHINA
Construction machinery shoe brake
Technical conditions
Issued on. December 12, 1991 Implemented on July 01, 1992
Issued by. Ministry of Mechanical Electronics Industry of People’s
Republic of China
Table of Contents
1 Subject contents and application scope ... 3
2 Normative references ... 3
3 Technical requirements ... 4
4 Test methods ... 8
5 Inspection classifications ... 9
6 Marking, packaging, transportation and storage ... 11
7 Quality assurance periods ... 12
Annex A The technical requirements of main positions of the major
components (Supplement) ... 13
Annex B Calculation method of rotational inertia (Supplement) ... 14
Annex C Records and reports of bench test (Reference) ... 15
Additional explanation ... 16
References and Original Chinese Documents ... 17
PROFESSIONAL STANDARD OF THE PEOPLE’S
REPUBLIC OF CHINA
JB/T 5949-91
Construction machinery shoe brake
Technical conditions
1 Subject contents and application scope
This Standard specifies the technical requirements, test methods, inspection rules,
marking, packaging, transportation and storage for shoe brake of wheel type construction
machinery traveling crane brake system.
This Standard applies to shoe brake of wheel cranes, loaders, scrapers, backhoe loaders
and other wheel engineering machinery traveling crane brake system (hereinafter referred
to as the brake).
2 Normative references
JB 3935 Automotive brake--Performance requirements
JB/T 5937 Engineering machinery--General technical specifications for gray pig iron
parts
JB/T 5938 Engineering machinery--General technical specifications for ductile iron
castings
JB/T 5944 Engineering machinery--General technical specifications for heat-treated
work pieces
JB/T 5936 Engineering machinery--General technical specifications for mechanical
processed parts
JB/T 5943 Engineering machinery--General technical specifications for weldments
JB/T 5945 Engineering machinery--General technical specifications for assembling
JB/T 5947 Engineering machinery--General technical requirements for packaging
JB 8 Product plates
GB 5763 Brake linings for automobiles
GBn 257 Car brake lining (Supplement for shape, friction performance and impact
strength)
JB 2805 Trucks and buses—Brake—Bench test methods
GB 2828 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply
to inspection of successive lots or batches)
3 Technical requirements
Brake products shall comply with the provisions of this Standard and be manufactured
according to the product drawings and technical documents approved by specified
procedures, if there is any special requirements, it shall be executed according to the
agreement between the user and the manufacturer.
3.1 Performance requirement
3.1.1 The initial braking speed of brake for the first, second and third effective
performance tests is 20km/h, when the brake line pressure is the maximum value
specified by the manufacturer, the braking torque of braking output shall not be less than
the rated value.
3.1.2 During the first, second and third effective performance tests, the difference of the
braking torque output - BETWEEN the initial braking speed is 40km/h AND the initial
speed is 20km/h - shall not be more than 10%, counted in percentage.
3.1.3 Other performance requirements for the brake shall be consistent with the relevant
provisions of JB 3935, and the performance requirements are shown in Table 1.
3.2 Materials
The raw materials used by the brakes shall have a formal mark and a certification of the
manufacturing plant. The manufacturer shall carry out random checks, and the brakes can
only be used after the qualification is confirmed.
3.3 Supporting parts and purchased parts
The supporting parts and purchased parts used by the brake must have product
Annex B
Calculation method of rotational inertia
(Supplement)
B1 Calculation of rotational inertia
B1.1 When making brake test for double front wheels brake test at the same time,
computational formula is as follows.
Where. IQ — Rotational inertia when making brake test for double front wheels brake test
at the same time, N•m2;
G1 — Front axle load at empty-load transport position, N;
r — Rolling radius of tire, m;
β — Front axle load transfer coefficient when empty-load braking.
B1.2 When Brake test is conducted for single front wheel, computational formula is as
follows.
Where. IF — Rotational inertia when making brake test for single front wheel, N•m2
Where ψ — Adhesion coefficient of road surface;
hg — Height of center of gravity at empty-load transport position, m;
b — The distance between center of gravity and rear axle, m.
Annex C
Records and reports of bench test
(Reference)
Table of Integral machine parameters and brake parameters
Vehicle model Manufacturer Exit-factory date
Machine quality at empty-load transport position kg
Tire type Rolling radius m
Axle load distribution.
Empty-load transport position, front N Rear N
Full-load transport position, front N Rear N
Height of center of gravity. At empty-load transport position m
At full-load transport position m
Position of center of gravity. The distance from the rear axle at empty-load transport
position m
The distance from the rear axle at full load-transport position m
Wheelbase m Maximum speed km/h
Brake type. Front Rear
Brake manufacturing plant Exit-factory date
Driving method of brake. Front Rear
Diameter of brake wheel cylinder. Front Rear
Maximum brake line pressure MPa
Braking force ratio of front and rear axle
Rated braking torque. Front N • m
Rear N • m
Trademark of friction material Manufacturer Exit-factory date
The gap between friction lining pad and brake drum. Front mm
Rear mm
Trademark of brake fluid Manufacturer Exit-factory date
Additional explanation
This Standard is proposed and administered by Tianjin Research Institute of Construction
Machinery of the Ministry of Machinery and Electronics Industry.
This Standard is drafted by Tianjin Construction Machinery Research Institute, Yingkou
Construction Mechanical Clutch Factory and Xuzhou Construction Machinery Bridge Box
Factory.
Main drafters of this Standard are. Yang Xiuwen, Chen Shurong, and Wang Zhongru.
References and Original Chinese Documents
[1] JB/T 5949 Construction Machinery shoe brakes technical conditions