JB/T 9840.1-1998 This standard is a revision of ZB T66 004-89 "Technical conditions for brake chambers of air brake systems for tractor trailers". The relevant contents of ZB T66 001.2-89 "Series parameters of air brake valves and brake chambers for air brake systems for tractor trailers" are incorporated into this standard. From the date of implementation of this standard, it will replace both ZB T66 004-89 and ZB T66 001.2-89. This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage requirements for brake chambers of air brake systems for tractor trailers. This standard applies to brake chambers of air brake systems for tractor trailers. JB/T 9840.1-1998 Technical conditions for brake chambers of air brake systems for tractor trailers JB/T9840.1-1998 Standard download decompression password: www.bzxz.net

ICS 65.060.10
Machinery Industry Standard of the People's Republic of China
JB/T9840.1—1998
Brake chamber for pneumatic braking system of tractor trailer-Technical requirement1998-09-30 Issued
State Machinery Industry Bureau
1998-12-01 Implementation
JR/T9840.1-1998
This standard is a revision of ZBT66004-89 "Technical conditions for brake chambers of air brake systems for tractors", and the relevant contents of ZD【66001.2-89 "Series of parameters of air brake system components for tractors, air brake lubrication and brake chambers" are incorporated into this standard
From the date of implementation, the vehicle standard will replace ZBT66004-89 and ZBT66001.2-89 at the same time. This standard was proposed and managed by the National Technical Committee for Standardization of Machinery. The drafting unit of this standard is Luoyang Tractor Research Institute. The main drafter of this standard is Ma En.
Machinery Industry Standard of the People's Republic of China
Technical conditions for brake chambers of air brake systems for tractor trailers
requirementJB/T9840,1-I998
Replace ZB F66 [04 -89
ZB T65 001.289
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of brake chambers of tractor trailer air brake systems.
This standard is applicable to brake chambers of tractor trailer air brake systems. 2
Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in the standards. When this standard was published, the versions shown were valid. All standards will be considered and the possibility of using the latest versions of the following standards will be explored by applying the methods of this standard, GB2828-87
GB:[13384--92
FB/T 5673—91
3 Series parameters
Batch-by-batch verification and sampling table (applicable to continuous batch inspection) General technical requirements for packaging of electromechanical products
General technical requirements for agricultural and forestry tractors and implements Parts of the brake system of the vehicle The series parameters of the brake gas system shall comply with the provisions of Table 1. Table 1
Nominal pressure L
Nominal pressure kPs
Number of stroke mm
Under 4400Pa, the maximum stroke cannot be swept
4 Technical requirements
QS-0.35/630
4.! The brake rate shall be manufactured according to the product drawings and technical documents approved by the specified order. OS-0.6-630
QS-0.9/630
4.2 The surface of the brake chamber should be smooth and smooth, without flash and burrs, and the base layer and the rust-treated layer should not fall off and the surface should meet the requirements of H/15673 and TQ-2-2. 4.3 The working temperature of the brake chamber is between -40 and 0.4 Properties
4.4. 1 Tightness
Fill the brake chamber with compressed air, and under the condition of normal displacement and working stroke, the pressure should not be full for 5 minutes. Approved by the State Bureau of Machinery Industry on September 30, 1998, and implemented on December 1, 1998. 4.4.2 Force characteristics JB/E9840.1-1998 4.4.2.1 When compressed air is filled into the brake chamber, at a force of 400 kV and a maximum operating stroke, the minimum thrust of the brake rod shall comply with the provisions of Table 1: 4.4.2.2 Within the specified range, the relationship between the push rod thrust F output by the brake chamber and the input air pressure P and the maximum operating stroke 5 shall comply with the provisions of Table 1. 4.4.3 Pressure resistance The brake chamber shall be subjected to a bench pressure resistance test at 125% of the nominal pressure for 30 action cycles, and then the lever shall be fully extended and maintained for 5 minutes before being fully discharged.
4.4.4 Durability
The brake chamber shall be subjected to a durability test on a bench with 25×10 cycles of action. No parts shall be damaged. During the test, no blocking or jamming shall occur in any moving parts, and no loose or jamming shall occur in any connecting parts. The sealing shall meet the requirements of 4.4.1, and the thrust characteristics shall meet the requirements of 4.4.2.
4.5 Warranty period
If the user complies with the installation, maintenance and use rules specified in the instruction manual of the tractor trailer air brake device, the warranty period is the same as that of the main engine.
During the warranty period, if the brake air brake fails or cannot be used normally due to the responsibility of the system, the system shall be responsible for all expenses and shall be replaced.
5 Test method
5.1 Sealing test
5. 1. 1 Test device
The schematic diagram of the test device is shown in the figure! :
1 Air separation: 2 Separation: 3 Air gain: 4 Standard pressure: 5 Pressure relief; 6 Device: 8 Sensor: 9 Brake chamber: 10 Variable speed drive: 11 Displacement sensor: 12 Sensor: 13 Transmitter: 14 Transmission control: Tightness test device diagram
5.1.2 Test system
5.1.2.1 The accuracy of the standard pressure gauge shall not be less than 0.4, and the upper limit shall not be more than 2.5 times of the maximum value. 5.1.2.2 The test pressure shall not be lower than the nominal pressure of the dynamic air chamber. 5.1.2.3 The travel of the dynamic air chamber is the working stroke. 2
5.1.2.4 The sealing device is not allowed to leak.
JH/T 984D.1-1998
5.1.3 Fill the compressed air into the pneumatic disc. Under the condition of nominal pressure and 1 working stroke, the air is stopped and the air is kept for 5m. The airtightness requirements must meet the requirements of 4.4.1. 5. 2 Thrust characteristics
5.2.1 Test device
The test device is the same as that of 5.11.
5.2.2 Test conditions
5.2.2.1 Same as 5.1.2.1wwW.bzxz.Net
5.2.2.2 Test pressure 400~630kPa
5.2.2.3 Same as 5.1.2.3 Dynamic setting
5.2.2.4 Same as 5.1.2.4.
5.2.3 Fill the brake air chamber with pressure screen air. When the pressure is divided into 400, 450, 500, 550, 600 and 630kPa, the dynamic air chamber can push the rod to increase from the maximum working stroke, and record the relationship between the push rod force F output by the brake air and the input air pressure P and the push rod stroke S. Repeat the test three times.
5.2.4 Test results processing
Make the test results of 52 into a force characteristic curve. See Figure 2 for the force characteristic curve. Mark the minimum standard rod force on the curve and determine its working stroke range. r(N
Figure 2 Schematic diagram of brake air chamber standard force characteristic curve
5.3 Test
5.3.1 Test device
Replace the test results of 5.11 with the station
5.3. 2 Test conditions
5.3.2. The same as the conditions in 5.12.1
5.3.2.1 The test pressure shall not be less than 125% of the rated pressure of the brake air chamber. 5.3.2.3 The frequency of the brake air chamber action shall be 5.30 times/min, and the air intake time shall not be greater than 0.5s/min. The brake air chamber shall be operated in a step-by-step cycle of emergency braking, pressure maintenance, and rapid release of the brake. The brake air input pressure value during the pressure maintenance period shall comply with the provisions of 5.3.2.2. 5.3.3 Carry out a pressure test in accordance with 5.1. The test pressure shall comply with the provisions of 5.3.22. 5.4 The continuous action shall not exceed 3 cycles, and the working condition of the brake air chamber shall be observed. 5.3.5 All the levers shall be pulled out for 5 minutes, and the pressure resistance test shall be carried out in accordance with the provisions of 5.3.2.3. No leakage shall be allowed. 5.3. 6 Test result processing
JB/T9840.1—1998
5.3.6.1 Determine the pressure resistance according to the test results of 5.3.3, 5.3.4 and 5.3.5. 5.3.6.2 Disassemble the brake chamber and inspect the parts when necessary. 5. 4 Durable parts
5. 4. Test equipment
The test is carried out on a dedicated bench 1.
5. 4. 2 Test method
The test force shall comply with the provisions of 5.1.2.2
5.4.3 According to 5.3.2.3, the pressure of the brake chamber auxiliary air pressure during the pressure holding period shall comply with the provisions of 5.1.2.2.
5.4.4 Avoid continuous action and count.
5.4.5 During the test, the tightness inspection shall be carried out regularly according to 5.」, and the interval between two consecutive inspections shall not exceed 5×10 action cycles. 5.4.6 The test shall be terminated when one of the following situations occurs, and the total number of completed tests shall be recorded: a. Basic parts damage
1) The seal fails and the derivative assembly is tight. According to the provisions of 4.4.4, 5.4.7 Test result processing
According to the test results of 5.4.5 and 5.4.6, the life of the easily removable parts and the life of the brake chamber shall be determined. 6 Inspection rules
6.1 Factory inspection
Each brake chamber shall be inspected by the quality inspection department of the manufacturer before leaving the factory. Factory inspection items are as specified in Table 2: 2
Sealing
Frequency inspection
6.2 Reverse inspection
6. 2. 1 Inspection items
Sealing, thrust characteristics, pressure resistance and durability. 6.2.2 Batch regulation and sampling plan
Thrust characteristics
Frequency
a) Brake chambers should be inspected in batches, each inspection batch N-26~50 units, one inspection batch can be composed of one production batch that has passed the factory inspection, or it can be composed of two production batches. If the number of products in a batch is large, each batch can also be divided into several inspection batches. b) According to GB2828, this standard adopts a normal sampling plan, and stipulates the use of special inspection level S-1, sample size n-2, qualified quality level AQL-=6.5, and can also be tested according to the sampling method agreed by the parties. 6.2.3 Judgment rules
(self) The durability test is assessed separately, and the test results should meet the requirements of 4.4.4. If the durability test fails, the product shall be judged as unqualified. b) The tested items shall be tested according to the sampling plan. If they do not meet the joint quality level, the batch of products shall be rejected; if they fail to meet the standards for consecutive inspections, double sampling shall be conducted for testing. After passing the inspection, the product shall be inspected regularly, marked, packaged, transported and stored. 7.1 The basic contents of product marking include: d) manufacturer name and address: b) product name; e) product model or mark: d) manufacturing date (year number) or production number, JB/E9840,1-1998 7.2 Brake air packaging shall comply with the provisions of B 13384. Brake air chambers shall provide at least the following technical documents: 3) product instruction manual h) product certificate: warranty certificate: packing list, 7.3 Ensure that the brake air chamber will not be damaged or lost during normal transportation. 7.4 The brake air chamber shall be stored in a warehouse with ventilation and dryness. It shall be ensured that it will not be damaged by rust due to poor packaging within one year from the date of delivery. Special requirements shall be implemented according to the agreement between the two parties.
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