Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1991-12-02
1993-09-28
Lorence, Richard M.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74867, 192 8713, B60K 4106
Patent
active
052478580
ABSTRACT:
A hydraulic relief valve according to the invention comprises; a housing having a clutch port communicating with a hydraulic chamber of a given hydraulic clutch and a drain port communicating with a drain, a spool inserted in the housing and being movable between an operational position at which the clutch port is isolated from the drain port and a relief position at which the clutch port communicates with the drain port, and biasing means to push the spool toward the operational position. The housing further includes an up-shift port communicating with a hydraulic chamber of an up-shift clutch which is engaged when the speed range is shifted up from the given speed range and a down shift port communicating with a hydraulic chamber of a down-shift clutch which is engaged when the speed range is shifted down from the give speed range. The hydraulic pressure in the chamber of the up-shift clutch is supplied into said housing through the up-shift port to push the spool toward the relief position when the speed range is shifted up. The hydraulic pressure in the chamber of the down-shift clutch is supplied into the housing through the down-shift port to push the spool toward the relief position when the speed range is shifted down.
REFERENCES:
patent: 3882738 (1975-05-01), Audiffred, Jr. et al.
patent: 4186627 (1980-02-01), Kuramochi
patent: 4253553 (1981-03-01), Yamada et al.
patent: 4756213 (1988-07-01), Mainquist et al.
Honda Giken Kogyo Kabushiki Kaisha
Levi Benjamin
Lorence Richard M.
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