Plunger-type master cylinder

A plunger type, master cylinder technology, applied in the direction of hydraulic brake transmission, etc., can solve problems such as damage to the durability of the sealing ring, and achieve the effect of achieving the sealing durability
CN1777529AInactive Publication Date: 2006-05-24BOSCH CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BOSCH CORP
Publication Date
2006-05-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a plunger-type master cylinder capable of reducing lost strokes and preventing residual pressure without impairing the durability of a seal ring (70). The piston (91) of the master cylinder is provided with a recess (93) on the outer peripheral surface, and an overflow port (900) is provided in the recess (93). The seal ring (70) is provided with a seal joint (70s) on the inner periphery of the front end portion of the inner peripheral lip (701). The sealing junction (70s) is located at the opening of the overflow port (900) on the side of the piston (91) when the brake is not working. The distance from the sealing joint (70s) to the overflow opening (900) is small. Furthermore, the sealing ring (70) is provided with first and second protrusions (7006, 7002) on the inner peripheral surface of the inner peripheral lip (701), so that the working fluid on the inner peripheral side of the inner peripheral lip (701) can be ensured. flow path.
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Description

Technical field

[0001] The present invention relates to a plunger-type master cylinder used in a vehicle hydraulic brake system and the like, and in particular to a brake control suitable for being performed separately from the brake control performed by the driver (for example, an automatic brake for vehicle posture control) The master cylinder technology for controlling or controlling the braking force of the driving wheels when the vehicle is accelerating. Background technique

[0002] Such a plunger-type master cylinder is a so-called cylinder that has an overflow port and a seal ring for opening and closing the overflow port in a piston that moves in the axial direction through a cylinder bore.

[0003] As the main technical problem of this plunger-type master cylinder, the first is to reduce the ineffective stroke caused by the operation of the brake; the second is to prevent the brake hydraulic pressure from remaining in the hydraulic chamber during non-braking operation (...

Claims

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