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Hd video downloadThe present invention relates generally to a clutch actuator and, more particularly, to a fluid-actuated clutch actuator for releasing a friction clutch for coupling the rotary output shaft of a continuously variable speed ratio transmission to a power takeoff system in a motor vehicle.
The continuously variable speed ratio transmission (CVT) is a transmission which is capable of changing its speed ratio between any ratio in the range of 1:1 to the speed ratio available at maximum torque capacity from the engine. The typical CVT comprises a primary pulley having a rotary input shaft connected to the power takeoff system, a secondary pulley having a rotary output shaft connected to the output of the engine, and a torque transmitting belt connecting the two pulleys. During vehicle acceleration, the torque transmitted through the belt from the engine to the power takeoff system must be reduced in order to maintain the available power output from the engine within the maximum torque capacity of the engine. To accomplish this, one or more clutches are arranged to be selectively engageable to couple the engine to the power takeoff system. The clutches may be controlled to be engageable or disengageable depending upon the required torque at a given point in the vehicle acceleration. One of the clutches is the clutch actuator. The clutch actuator is coupled to the belt and is operable to control engagement of the belt between the two pulleys.
One type of a clutch actuator known in the prior art employs a system of fluid pressure actuators in order to engage the belt. One of the actuators includes a pump and a plurality of valves connected to the pump and arranged in a parallel fluid path configuration. When the system is deenergized, the flow of fluid through the system is such that the actuator which is disposed downstream of the pump is the dominant load. As the pressure in the upstream actuator rises, the pressure in the downstream actuator decreases to a level sufficiently low to permit the downstream valve to open. This allows fluid to bypass the downstream valve and flow through the upstream valve to refill the downstream actuator. In such a system, the fluid pressure in the downstream actuator is substantially below the maximum pressure which the downstream valve is designed to withstand. This means that the valve in the upstream actuator must be designed with a pressure rating which is approximately twice ac619d1d87
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