Hydraulic servo for a gear change

Machine element or mechanism – Gearing – Interchangeably locked

Reexamination Certificate

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Details

C074S337500, C074S473110

Reexamination Certificate

active

07603923

ABSTRACT:
Described herein is a hydraulic servo for a gear change provided with a control shaft; the servo has: a frame; a first hydraulic actuator, which is carried by the frame and has two first chambers, which are alternatively filled with a pressurized fluid for displacing the control shaft axially in the two directions; two first solenoid valves, which control filling of the two first chambers; a second hydraulic actuator, which is carried by the frame and has at least one second chamber that is filled with a pressurized fluid for rotating the control shaft about its central axis; a second solenoid valve, which controls filling of the second chamber; and a supporting body, which is fixed to the frame, houses the solenoid valves, and has inside it a series of hydraulic circuits, which connect the solenoid valves themselves both to the chambers of the actuators and to a supply of the pressurized fluid.

REFERENCES:
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patent: 5473959 (1995-12-01), Lasoen
patent: 6102829 (2000-08-01), Muddell et al.
patent: 6422104 (2002-07-01), Kamiya
patent: 7464617 (2008-12-01), Baldascini et al.
patent: 2001/0037696 (2001-11-01), Meyer et al.
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patent: 0 541 035 (1993-05-01), None
patent: 1 544 492 (2005-06-01), None
patent: WO 01/51829 (2001-07-01), None
European Search Report, EP 06 42 5096, Jul. 31, 2006, 3 pp.

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