Hydraulic continuously variable transmission for use on vehicle

Details Hydraulic continuously variable transmission for use on vehicle Hydraulic continuously variable transmission for use on vehicle

1998-05-08

2000-05-30

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Methods of operation

60436, 60442, 60468, 180338, F16D 3108

Patent

active

060677953

ABSTRACT:
A hydraulic continuously variable transmission for use on a vehicle comprises a hydraulic closed circuit, first and second pressure controlling means, brake operation detecting means and deceleration detecting means. The hydraulic closed circuit includes a hydraulic pump, a hydraulic motor, a first oil passage connecting a port of the hydraulic pump with a port of the hydraulic motor and a second oil passage connecting another port of the hydraulic pump with another port of the hydraulic motor, and first and second pressure controlling means control the pressures of the first and second oil passages, respectively. If the deceleration of the vehicle is greater than a standard deceleration when the operation of the brake is detected, then the pressure of the first or second oil passage whose pressure is higher than that of the other is lowered to a predetermined low pressure that is higher than the pressure of either oil passage which is lower by either the first or second pressure controlling means. This predetermined low pressure is determined in reverse proportion to the engine rotational speed, thus preventing the engine from stalling when the wheels are locked up in an abrupt braking operation.

REFERENCES:
patent: 3923129 (1975-12-01), Rusch et al.
patent: 4887428 (1989-12-01), Iino
patent: 4958494 (1990-09-01), Maki et al.
patent: 5001900 (1991-03-01), Sasajima et al.
patent: 5277286 (1994-01-01), Yamamoto et al.
English language translation of Abstract of JP 62-147148.
English language translation of Abstract of JP 2566457.

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