Hydraulic circuit for a public works vehicle and vehicle...

Details Hydraulic circuit for a public works vehicle and vehicle... Hydraulic circuit for a public works vehicle and vehicle...

2005-05-27

2010-12-28

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Having distinct cooling or lubricating structure

Reexamination Certificate

active

07856819

ABSTRACT:
The invention relates to a hydraulic circuit (20) for public works vehicles. The circuit comprises: a pump (21) which is driven by a heat engine (22) using a load sensing technique; a hydraulic motor (10) which is used to move one part of the vehicle (8) and a set of hydraulic actuators (12-14); at least one distributor (29) which supplies the hydraulic actuators (12-13) in a controlled manner; and a device (45) for cooling the fluid circulating through the circuit. The inventive circuit is characterised in that it comprises: a pressure-reducing device (33) which is connected to the outlet of the pump (21) and which delivers a first pressure level, said device (33) being connected to the feed port (34) of the hydraulic motor (10); and an assembly which connects a check valve (40) and a calibrated orifice (41) in parallel, said assembly being connected downstream of the feed port (34) of the hydraulic motor and the return line (36) of the distributor (29) and upstream of the cooling device (45).

REFERENCES:
patent: 4354351 (1982-10-01), Dezelan
patent: 4558631 (1985-12-01), Fassbender
patent: 4757685 (1988-07-01), Burckhartzmeyer
patent: 5927072 (1999-07-01), Vannette
patent: 6073536 (2000-06-01), Campbell
patent: 1126088 (2001-08-01), None
patent: 1479920 (2004-11-01), None

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