Multi-disc frictional engagement mechanism

摘要

A multi-disc frictional engagement mechanism includes driven plates and drive plates, a clutch piston including a radially extending first pressure receiving portion, a joint piston including a radially extending second pressure receiving portion and an engaging portion which is engaged with a clutch hub to engage the clutch hub and the clutch drum such that the clutch hub and the clutch drum are not relatively rotatable when the joint piston advances, a first oil chamber which causes a hydraulic pressure to act on the first pressure receiving portion, and a second oil chamber which communicates with the first oil chamber and to which the hydraulic pressure is supplied later than to the first oil chamber to act on the second pressure receiving portion when the hydraulic pressure is supplied to the first oil chamber.

主权项

1. A multi-disc frictional engagement mechanism for coupling a first member and a second member which are coaxially arranged, comprising:
a plurality of first friction plates mounted on the first member slidably in an axial direction; a plurality of second friction plates mounted on the second member slidably in an axial direction, the plurality of first friction plates and the plurality of second friction plates being alternately arranged; a clutch piston arranged displaceably in a direction perpendicular to the pluralities of the first and second friction plates and including a radially extending first pressure receiving portion; a joint piston including a radially extending second pressure receiving portion provided so as to be displaceable in the axial direction relative to the second member without being relatively rotatable, and an engaging portion which is configured to engage with the first member and to engage with the second member such that the first and second members are not relatively rotatable when the joint piston advances; a first oil chamber which is configured to cause a hydraulic pressure to act on the first pressure receiving portion; a second oil chamber configured to communicate with the first oil chamber and to which the hydraulic pressure is supplied later than to the first oil chamber so as to act on the second pressure receiving portion when the hydraulic pressure is supplied to the first oil chamber, and a restricting mechanism configured to restrict a retracting movement of the joint piston by a mechanical contact in a state in which the engaging portion is engaged with the first member and a supply of the hydraulic pressure to the first oil chamber is stopped.