| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic pressure supply device of a driving force distribution device, capable of effectively suppressing fluctuation of the hydraulic pressure of a piston chamber by a simple configuration for which the number of part items is suppressed to be small. <P>SOLUTION: For the piston chamber (32) for generating the hydraulic pressure for driving a piston (33) which imparts an engaging pressure to a clutch (20), the surface thereof on the opposite side of the piston (33) is covered with a back surface part (31a) in a thin plate shape which is a part of a piston housing (31). The back surface part (31a) is set to a thickness dimension to generate deflecting deformation on the surface thereof by the hydraulic pressure of hydraulic fluid inside the piston chamber (32). Thus, the piston chamber (32) has a function as an accumulator for suppressing the fluctuation of the hydraulic pressure. Also, by forming a projected rib (31b) for reinforcing the back surface part (31a) on the surface on the opposite side of the piston chamber (32) of the back surface part (31a), strength required for the piston housing (31) is secured. <P>COPYRIGHT: (C)2013,JPO&INPIT |
