Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1974-10-21
1976-02-10
Scott, Samuel
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74869, 74864, 74645, B60K 4118
Patent
active
039371085
ABSTRACT:
To permit continued operation of an electronically controlled gear change transmission in case of failure of electronic control signals, at least one three-way check valve is included in the system to connect, in one mode of operation, the normal output control signals from a hydraulic control valve system to engage an operating element (such as a control clutch, control band, or the like in the automatic transmission) and, when in another position, connect hydraulic pressure to effect connection of drive power to the first gear, or reverse (as selected by a control selector) and in the absence of electrical command signals from the electronic control unit. By use of a second three-way check valve, simple interlocks to prevent shifting into reverse when the vehicle is moving forward in excess of a given speed, and to permit holding of an engaged gear in case of malfunction, can be provided.
REFERENCES:
patent: 3650161 (1972-03-01), Ito et al.
patent: 3665779 (1972-05-01), Mori
patent: 3750495 (1973-08-01), Ito et al.
Chandler Lance W.
Robert Bosch G.m.b.H.
Scott Samuel
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