drive system for vehicles

Abstract

A drive system for a vehicle includes an engine, a transmission, a clutch mechanism including first and second clutch portions, the clutch mechanism being switchable between connected and disconnected states, and a clutch operation mechanism switching the clutch mechanism between the connected and disconnected states, the clutch operation mechanism including a clutch drum forming a drum chamber, a piston dividing the drum chamber into a spring chamber and a pressurizing chamber, a control valve, a biasing member arranged in the spring chamber and exerting a biasing force in a direction in which the first and second clutch portions are engaged with each other, and a bore formed in the clutch drum, the bore discharging oil of the spring chamber to an outer side of the spring chamber in a state where a counteracting force against a centrifugal force acting in the pressurizing chamber is generated in the spring chamber.

Description

technical field [0001] The invention relates to a drive system for a vehicle. Background technique [0002] In JP2009-101730A, JP2006-137406A, and JP2010-6190A (hereinafter referred to as Patent Documents 1, 2, and 3), each discloses a well-known drive system for a vehicle including a transmission (the engine driving force from the engine output shaft is transmitted to the transmission) and a clutch mechanism arranged between the output shaft of the engine and the input shaft of the transmission. According to the drive systems disclosed in each of Patent Documents 1, 2 and 3, the clutch mechanism includes a first clutch portion arranged at an engine output shaft, and a second clutch portion arranged at a transmission input shaft. The clutch mechanism can be switched between a connected state and a disconnected state. In the connected state, the first clutch part and the second clutch part are engaged with each other, thereby transmitting the driving force of the engine to t...

AI Technical Summary

Problems solved by technology

[0003] According to the drive systems disclosed in each of Patent Documents 1, 2 and 3, under the condition that the input shaft of the transmission is rotating, when the clutch mechanism is brought into the connected state or into the disengaged state, the hydraulic pressure (hereinafter due to the centrifugal force of the rotation) The hydraulic pressure caused by the rotating centrifugal force is called centrifugal hydraulic pressure), which will affect the operational responsiveness of the clutch mechanism when the clutch mechanism switches between the connected state and the separated state

As a result, the improvement of the operational responsiveness of the clutch mechanism may be limited

In addition, centrifugal hydraulic pressure due to rotation is affected by the rotational speed of the input shaft

According to this, the operational responsiveness of the clutch mechanism is affected by the moving speed of the vehicle, thereby limiting the improvement of the operational responsiveness of the clutch mechanism

Images