Master cylinder

A technology for cylinder body and inner diameter, which is applied in brakes, mechanical equipment, transportation and packaging, etc. It can solve the problems of increased processing cost and time spent in processing, and achieve the effects of shortening processing length, suppressing cost increase, and reducing air retention
CN1807163AActive Publication Date: 2006-07-26HITACHI LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI LTD
Publication Date
2006-07-26

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Abstract

Disclosed is a master cylinder, which has no limit to the brake fluid supply while the air is drawn out, and can restrain the increase of the cost of the connected groove processing, wherein, a pressure chamber part is formed in the cylinder body (15); big- diameter- hole parts (40, 41) with diameter bigger than sliding internal diameter parts (30, 35) are formed coaxially with the sliding internal diameter parts (30, 35) on the side opposite to circumferential grooves (43, 47) of the sliding internal diameter parts (30, 35); communicated grooves (94, 96) which are used for communicating the circumferential grooves (43, 47) with the big- diameter- hole parts (40, 41) are formed on the upper part of the sliding internal diameter parts (30, 35); the deepest position of the communicated grooves (94, 96) are closer to the radial outer side than the bottom of the circumferential grooves. Thereby, while the air is drawn out, the supply of the brake fluid is not limited, so as to reduce the length of the communicated grooves (94, 96), the processing period and the increase of the cost.
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Description

technical field

[0001] The present invention relates to a master cylinder for supplying brake fluid to a brake device of a vehicle. Background technique

[0002] As a master cylinder for supplying brake fluid to a brake device of a vehicle, there is a structure in which a plunger-type piston is directly fitted and inserted into a cylinder body. In this kind of master cylinder, in order to connect the peripheral groove in which the piston oil seal is embedded with the discharge passage on the bottom side of the cylinder, an annular large-diameter groove is provided in the cylinder body on the discharge passage side, and the large-diameter groove is connected. The linear communication groove between the groove and the above-mentioned peripheral groove is provided in the upper part inside the cylinder main body. In addition, when the air in the cylinder main body is extracted, the piston oil seal is opened by the pressure difference, and the brake fluid is supplied to the pist...

Claims

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