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Assignee501 Lucas Industries Public Ltd. Company
InventorsRedmond McCusker, Helmut Heibel, Leo Gilles
Estimating the term…
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 Alternatively the cam bearing assembly may be withdrawn with the shaft, the pistons being retained by stop devices located in the bores.
An hydraulic pump and motor assembly for a vehicle hydraulic system, said pump being operated by said motor to pump hydraulic fluid in an hydraulic circuit of said system, said assembly having a housing accommodating said pump and said motor, said pump comprising bore means defined in said housing, together with a reservoir port and a delivery port for connection to said hydraulic circuit, and spring-loaded piston means working in said bore means to pump hydraulic fluid from said reservoir port to said delivery port, said motor having a rotary output shaft, an eccentric mounted on said output shaft, and cam bearing means mounted on said eccentric, with said piston means operated from said eccentric through said cam bearing means, said assembly including retaining means for said piston means to limit radially inwards movement of said piston means in said bore means, when said motor output shaft is withdrawn from said housing, to an amount insufficient to break said hydraulic circuit.
Dependencies are inferred from the claim text.