| 摘要 |
PURPOSE: Piston structure of a clutch release cylinder for a vehicle is provided to prevent oil leakage and lowering of hydraulic pressure in the release cylinder by restricting a parting line in a mold with making a piston of synthetic resin, and to improve strength against tension of a spring by modifying the structure. CONSTITUTION: A piston is supported elastically by a return spring(42) in a cylinder, and divided into a piston body(41a) and a return spring supporting part(43). The spring supporting part and the piston body are manufactured individually, and combined integrally by an assembling unit. The assembling unit consists of an assembling protrusion(44) formed in the inner periphery of the spring supporting part, and an assembling groove(45) formed in the outer periphery of the piston body. The piston body is combined with the spring supporting part by inserting the assembling protrusion to the assembling groove, and by pressing elastic grooves(41c) with the inner periphery of the spring supporting part. The parting line of a mold is eliminated, and burr is not formed in the cup installation surface of the piston body with manufacturing the spring supporting part and the piston body individually. Oil leakage, lowering of hydraulic pressure and the breakage of the piston are prevented with improving the strength against tension of the spring by modifying the structure.
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