This standard specifies the technical requirements for the pneumatic and hydraulic brake systems of wheeled tractor trailer units. This standard applies to pneumatic and hydraulic brake systems. JB/T 5997-1992 Technical requirements for brake systems of wheeled tractor trailer units JB/T5997-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB5997-92
Braking System of Wheeled Tractor Trailer Unit
Technical Conditions
Published on 1992-05-28
Implementation on 1993-01-01 by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Braking System of Wheeled Tractor Trailer Unit
Technical Conditions
1 Subject Content and Scope of Application
JB599792
This standard specifies the technical requirements for the pneumatic and hydraulic brake systems of wheeled tractor trailer units (hereinafter referred to as units). This standard applies to pneumatic and hydraulic brake systems. 2 Technical requirements
2.1 When the driving and parking brake systems produce the maximum braking effect, the pedal force shall not exceed 600N, and the hand pull (pressure) force shall not exceed 400N.bzxz.net
2.2 The maximum braking effect of the driving brake shall be achieved within 4/5 of the full pedal stroke. 2.3 For units using pneumatic brakes, when the pressure rises to 630kPa, the air compressor stops working in the non-braking state, and the pressure drop value observed for 3 minutes does not exceed 10kPa; in the case of full braking, the pressure drop value observed for 3 minutes after the air pressure stabilizes does not exceed 30kPa.
2.4 For units using hydraulic brakes, when the pedal force is the maximum, it is maintained for 1 minute, and the pedal shall not move slowly to the bottom. 2.5 For units using pneumatic brakes, a safety valve and a drain valve must be installed on the air storage cylinder. When the inflation pressure reaches the specified value, the inflation will not continue. The capacity of the air cylinder should be able to ensure that the air pressure in the cylinder shall not be less than 400kPa after the unit has been fully braked for 5 consecutive times: 2.6 For units using pneumatic brakes, the air supply of the air compressor should be able to meet the requirement that the air pressure in the cylinder can rise from zero to 400kPa when the engine runs at medium speed for 4 minutes.
2.7 For units using pneumatic brakes with trailers fully loaded with 5t or more, when the trailer is accidentally separated from the tractor, the trailer can brake automatically. 2.8 The wheeled tractor trailer unit is driven at a speed of 20 km/h on a flat, clean, dry cement or asphalt road surface (adhesion coefficient not less than 0.7) both when empty and fully loaded. Under full braking, the braking distance shall not be greater than 5.4m and 6m respectively, or the average braking deceleration shall not be less than 2.9m/s and 2.6m/s; the deviation shall not be greater than 80mm, and the trailer brake mark shall be greater than the tractor brake mark. 2.9 When the unit is driven at a speed of 20 km/h, the coordination time of the braking system (under full braking, the time from the start of the pedal action to the average braking deceleration, when empty load reaches 2.9m/s and when fully loaded reaches 2.6m/s) is shown in the table below. Unit type
Total weight <4.5t
4.5t<Total weight <12t
Total weight >12t
Brake system coordination time S
2.10 The complete release time of the unit brake (the time required from releasing the brake pedal to completely eliminating the movement) shall not be greater than 0.8s. 2.11 When the fully loaded unit is on a 16% slope, divided into two situations, uphill and downhill, it should not slide down after braking and stopping for 30 minutes; it is allowed to use the method of measuring traction instead of the slope test, that is, after fully braking and stopping on a flat road, the traction resistance of the unit should be not less than 16% of the total weight.
Approved by the Ministry of Machinery and Electronics Industry on May 28, 1992 and implemented on January 1, 1993
Additional instructions:
JB/T5997-92
This standard was proposed by the National Technical Committee for Tractor Standardization. This standard is under the jurisdiction of the Luoyang Tractor Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Luoyang Tractor Research Institute of the Ministry of Machinery and Electronics Industry, Shanghai Tractor Factory, and Shanghai Meimei Machinery Factory. This standard was mainly drafted by Li Shunqing, Lu Haihe, Wang Minghua and Chen Baosheng. The People's Republic of China
Mechanical Industry Standard
Braking System of Wheeled Tractor Trailer Unit
Technical Conditions
JB599792
Published by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
Copyright reserved. No reproduction allowed
Format 880×1230
Print Sheet 3/8 Number of Words 2000
First Edition in October 1992
First Printing in October 1992
Print Quantity 0.001-—500
Price 1.00 Yuan
No. 0910
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