Patent ID: 8235189
Filing Date: 2012-08-07
Classification: F16D

Abstract:
1. A drum brake apparatus comprising: a wheel cylinder assembly configured to expand a pair of brake shoes, the wheel cylinder assembly comprising: wherein the cylinder body includes a structure defining a single straight pipe both ends of which are open, the cylinder body including a first cylinder portion for one of the pistons on one end of the cylinder body and a second cylinder portion for the other of the pistons on the other end of the cylinder body, wherein a valve seat of the control valve includes the fluid path and is arranged between the first cylinder portion and the second cylinder portion, wherein the control valve includes a plug opposing the valve seat; wherein the valve seat and the plug are respectively restrained in position by stop rings fixed to groove portions of an inner periphery of the cylinder body; and wherein a valve body is configured to seat on the valve seat by cooperatively moving with a returning movement of the one of the pistons so as to close the fluid path in the valve seat, the valve body including a through hole communicated with a fluid path of the plug and being mounted in a recess portion formed in the plug.