| 摘要 |
<p>928,334. Fluid-pressure brakes. BENDIX CORPORATION. Nov. 29, 1961 [Dec. 1, 1960], No. 42705/61. Class 103 (1). [Also in Group XXIX] A control valve for use in a power unit A of a servo-operated brake master cylinder, comprises a valve body having a valve seat 24, a closure member 28, a diaphragm 34 attached to the body and the closure member and a structure 66 providing frictional resistance between the closure member and the body. The structure 66 is in the form of a ring fitted into the body and provided with projections which frictionally engage the periphery of a flange 32 on the closure member 28 thereby preventing flutter of the latter; the ring may be formed integrally with the housing. In a modification, the projections may be formed on the periphery of the flange 32 and frictionally engage with the body. As shown, the valve 28 is arranged in a vacuum-operated brake servo unit, the valve being urged by a spring 50 against the seat 24. A seating face 26 formed on a valve plunger member 22 is also arranged to co-operate with the closure member 28. In the inoperative position of the unit the seating face 26 is slightly away from the closure member 28 so that atmospheric pressure acts on both sides 12, 14, of a power piston B via filter 42, port 44, seat face 26, control chamber 40, and port 48. Upon actuation of a rod 54, the seating face contacts the closure member 28 thereby moving the latter away from the seat 24 and so allows the side 12 of the piston B to communicate with a vacuum source via a chamber 38 and a pipe 46. The atmospheric pressure on the side 14 of the piston then moves the latter end so as to operate the plunger D of the hydraulic brake unit A. Specification 846,211 is referred to.</p> |
