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Vacuum brake booster

A servo brake and negative pressure technology, applied in the direction of brakes, brake components, brake transmission devices, etc., can solve problems such as high noise, and achieve simple installation and implementation.

Inactive Publication Date: 2017-02-15
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of negative pressure servo brake is that it works very noisy due to the sudden and rapid entry of external air into the pressure variable chamber when the braking action is performed

Method used

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  • Vacuum brake booster
  • Vacuum brake booster

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] according to figure 1 , the negative pressure servo brake 1 is connected to a master cylinder 2, in particular a schematically shown tandem master cylinder, which supplies pressurized brake fluid to the brake circuits C1, C2 of the vehicle. It is fixed to a bulkhead 4 which separates the cab from the engine casing.

[0018] According to orientation conventions, the master cylinder 2 is located at the front AV of the servo brake 1 and the joystick 3 is located at the rear AR.

[0019] The vacuum servo brake 1 is actuated via a lever 3 connected to the brake pedal. The servo brake 1 is constituted by a negative pressure housing 100 provided with two chambers CH1 and CH2. Chamber CH1 is under negative pressure (P 1 atm The intake of the lower air is controlled by the brake pedal, which is actuated by the joystick 3 on the air intake valve described below. The piston 110 is connected to the master cylinder 2 so as to control the master cylinder 2 to pressurize the brake...

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PUM

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Abstract

Vacuum brake booster comprising a vacuum housing (100) subdivided by a piston (110) into a vacuum chamber (CH1) and a variable-pressure chamber (CH2) for amplifying the input force Fe and applying the output force (Fs) to the master cylinder (2). The piston (110) is carried by a valve body (120) connected to the control rod (3) by a plunger piston (130) collaborating with the valve (140) to command the pulling of a vacuum in the variable-pressure chamber (CH2) or the venting thereof to atmosphere at the moment of braking. The air path (CAE) passes via the opening (183) through the inlet filter (160), the inside of the body (120) and the passage of the sealing seat (132) controlled by the valve (140) to pass through the passage (128) of the body (120) opening between the cover (103) and the piston (110, 111) into the chamber (CH2). The outlet of the passage (128) is covered by a slowing filter (170).

Description

technical field [0001] The present invention relates to a negative pressure servo brake, which includes a negative pressure box, which is divided into a vacuum chamber and a pressure variable chamber by a piston, so as to amplify the input force and apply the output force to the master cylinder 2 , the piston is supported by the valve body, which is connected to the operating rod through the plunger, which cooperates with the valve to control on the one hand the variable pressure chamber at Vacuum, on the other hand to communicate this pressure variable chamber to atmosphere during braking, the rear of the body is provided with an air inlet opening and an inlet filter, the air path includes the following: the opening through the inlet filter, the body Access to the interior, and to the sealing seat, controlled by a valve, to enter the pressure variable chamber through the channel of the body communicating between the cover and the piston. Background technique [0002] Such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/569B60T13/57B60T17/00
CPCB60T17/008B60T13/569B60T13/57
Inventor B.贝托米厄
Owner ROBERT BOSCH GMBH