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In order to ensure safety of the trailer transportation of the tractor and achieve the aim
of prompt stop of the tractor and trailer, air brake system is mounted on the tractor. The
system is made up of air compressor (1), receiver (5), brake valve (4), air pressure gauge and
pipes (Fig.4-23).
1) Working process of air brake device of trailer
Air brake trailer is braked through the compressed air driving the brake hung on the
trailer wheels. Firstly the compressed air is conveyed to receiver from air compressor through
pipes, then is conveyed to the brake air chamber of the trailer wheels through air-bleed hole
(hole B in Fig.4-24) of the brake valve. When stepping on the brake pedal, through the
connecting rod (8 in Fig.4-23) driving the pull arm 10 of brake valve (Fig.4-24) to rotate
around axle pin 13 to make adjusting bolt 12 press down brake pull rod 9, compress balance
spring 7, push core rod 5, compress return spring 4, push valve seat assembly 3 aside
(compress valve seat spring 2), open high pressure air passage, and at this moment, the
compressed air of receiver, from hole A to valve seat hole, then to mouth of hole B and
continuously respectively enter the left and right brake air chambers of trailer wheels
through air-bleed pipe (7 in Fig.4-23) of brake valve and three-way pipe connector and push
the brake tappets of left and right brakes, and thus achieve brake of the trailer.
After completing brake, loosen foot brake pedal, the brake adjusting bolt will return to
the initial position, and the brake tappets and core rod assembly will also return to their
initial position under the effort of compressed return spring; then the valve seat assembly 3
will move right to contact the valve mouth on left housing 6 under the effort of compressed
Summary of Contents for JINMA-200
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