LEVELLING VALVE ASSEMBLY

摘要

1307128 Controlling vehicle suspension height AISIN SEIKI KK 28 Sept 1970 [26 Sept 1969] 45987/70 Heading B7D A vehicle suspension levelling valve comprises a body 10, an actuating shaft 22 rotatably mounted in the body and carrying at one end a height sensing arm 11, a resilient connecting member 29 engaged with the actuating shaft 22 and with a double-acting hydraulic damping piston 35, a connecting lever 63 co-operating with the resilient connecting member 29 and secured to a supporting shaft 45 carrying a valve operating lever 47 arranged to operate compressed air supply and exhaust valves 53, 54. The resilient connecting member 29 includes a close coiled spring engaged with a seating 27 secured to the actuating shaft 22 and with a disc 132 on a rod member 33 having a hemispherical end 32 received in a lateral bore 36 in the damping piston 35. A pin 62 on the hemispherical end 32 engages with a predetermined free play in a forked end on the connecting lever 63. The valve operating lever 47 has respective arms one of which actuates the appropriate valve 53, 54 according to the direction of movement of the lever once a predetermined free play between the lever and the stems 55, 56 of the valves has been taken up. A space 21 housing the lever 47 is connected to a pneumatic spring through a pipeline 17, the exhaust valve 54 providing communication between the space 21 and a low pressure reservoir through a pipeline 16 and the supply valve 53 providing communication between the space 21 and a high pressure reservoir fed by a compressor from the low pressure reservoir through a sintered metal filter 61 and a non-return valve 57. The damping piston 35 fits in a bore 34 with a diametral clearance which permits a throttled flow of damping liquid past the piston. Flap valves 39, 40 associated with passages 37, 38 in the damping piston 35 permit rapid return of the piston to the central position. A pointed locking screw 65 is provided on the arm 11 for co-operating with the housing to assist in setting up the valve for correct operation.