Control system for a hydraulic transmission to prevent vehicle creep
This patent describes a hydraulic shift transmission for a vehicle including a hydraulic torque converter for transmitting a torque from an engine to a road driving system, comprising: a plurality of gear trains interposed between the hydraulic torque converter and the road wheel driving system; the gear trains being different in the gear ratio; the gear trains including a first speed gear train adapted for the running at relatively low speeds; a plurality of clutch mechanism alternatively installed in the gear trains; the clutch mechanisms being each hydraulically connectable and disconnectable; the clutch mechanisms including a first speed clutch mechanism installed in the first speed gear train having a spring with a preset load; a hydraulic control system for selectively supplying a hydraulic pressure to the clutch mechanisms in accordance with shift operations; an oil supply line connecting the hydraulic control mechanism to the first speed clutch mechanism; a release valve means, provided in the oil supply line, for releasing the hydraulic pressure while the vehicle speed is lower than a preset reference value with the engine idling; an oil return port open relative to the oil supply line and releasing the hydraulic pressure while opened; a piston member having an axis and being slidable axially for closing the return port; and a resilient member normally biasing the piston member in one axial direction such that the piston member closes the return port.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4643049
- OSTI ID:
- 6733196
- Resource Relation:
- Patent File Date: Filed date 18 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MECHANICAL TRANSMISSIONS
HYDRAULIC CONTROL DEVICES
VEHICLES
ENGINES
GEARS
ORIFICES
PISTONS
PRESSURE CONTROL
ROAD TRANSPORT
SPEED REGULATORS
TORQUE
CONTROL
CONTROL EQUIPMENT
EQUIPMENT
LAND TRANSPORT
MACHINE PARTS
OPENINGS
TRANSPORT
330602* - Vehicle Design Factors- Engine-Transmission Matching