Hydraulic pump and motor assemblies for vehicle hydraulic system

Details Hydraulic pump and motor assemblies for vehicle hydraulic system Hydraulic pump and motor assemblies for vehicle hydraulic system

1989-08-03

1990-10-30

Chambers, A. Michael

Pumps

Three or more cylinders arranged in parallel, radial, or...

Radial cylinders

417360, B05D 300, B05D 312

Patent

active

049665308

ABSTRACT:
An hydraulic pump and motor assembly for a vehicle hydraulic system has a housing accommodating the pump and motor, the pump having one or more spring-loaded pistons working in complementary bores to pump hydaulic fluid from a reservoir port to a delivery port, and the pistons being operated from an eccentric on a rotary output shaft of the motor through a cam bearing assembly. The assembly includes a retaining device for the pistons to limit their radially inwards movement, when the motor output shaft is removed, to an amount which is insufficient to break the hydraulic circuit containing the pistons. This enables the motor to be removed, while ensuring that the pistons are retained in their bores so that the hydraulic circuit remains intact. The cam bearing assembly may be mounted on the shaft without being retained on it, with the engagement between the pistons and the cam bearing assembly arranged so that they are all retained in the housing on withdrawal of the output shaft. Alternatively the cam bearing assembly may be withdrawn with the shaft, the pistons being retained by stop devices located in the bores.

REFERENCES:
patent: 2309551 (1943-01-01), Trapp et al.
patent: 3000319 (1961-09-01), Tuck
patent: 3620649 (1971-11-01), Cary
patent: 4629401 (1986-12-01), Grote

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