Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-04-21
1978-12-26
Wyche, Benjamin W.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4104
Patent
active
041310357
ABSTRACT:
In a hydromechanical transmission, low and high range clutches are selectively operated in response to variation of an actual speed ratio between an input shaft and an output shaft to complete low or high speed drive power train. The transmission comprises a speed ratio detecting valve for detecting lower and higher limits of a predetermined speed ratio and a clutch control valve for selectively operating the low and high range clutches when the actual speed ratio reaches in a range defined by the lower and higher limits of the predetermined speed ratio. The operation of the clutch control valve is controlled by a pressure control valve in accordance with a difference in value between a first signal responsive to a throttle opening angle and a second signal responsive to the rotation speed of the input shaft such that the low and high range clutches are selectively operated only when the difference between the first and second signals becomes a predetermined value.
REFERENCES:
patent: 3665787 (1972-05-01), Wilkinson
Maeda Hiroaki
Mizuno Kiyohumi
Takahashi Shigeo
Watanabe Tsukasa
Aisin Seiki Kabushiki Kaisha
McKenzie, Jr. Frank H.
Wyche Benjamin W.
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