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Negative pressure doubling device

A technology of booster and negative pressure, applied in the directions of brake transmission, transportation and packaging, brakes, etc., can solve the problems of high cost, complex structure, assembly cost, etc., to reduce the number of occurrences, reduce noise, and reduce the number of actions Effect

Inactive Publication Date: 2006-07-26
BOSCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, the negative pressure booster device disclosed in the aforementioned publications has the problems that the structure of the mechanical BA is extremely complicated, and its assembly is very time-consuming and costly.

Method used

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Examples

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Embodiment Construction

[0034] Below, preferred implementation forms of the present invention will be described with reference to the accompanying drawings.

[0035] figure 1 It is a cross-sectional view showing a non-operating state of a first example of a negative pressure booster applied to an embodiment of the brake booster according to the present invention, figure 2 It is a partial enlarged cross-sectional view showing the vacuum valve and the atmospheric valve of the first example after partial enlargement. image 3 It is a drawing that partially shows the operating state of the cylindrical member of the first example, Figure 4 It is a drawing showing the abutting state of both the reaction disc and the spacer in the first example, (a) shows the abutting state when it is not in operation, and (b) shows the abutting state when performing a normal braking operation State, (c) shows the contact state when BA operation is performed and belongs to the low input and output category, (d) shows th...

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PUM

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Abstract

In the negative pressure doubling device of the invention, a threshold line is set for starting a BA operation at a pedal stepping speed not less than a set speed, and the inclination of the threshold line is set equal to that for a servo ratio (SR2) smaller than a servo ratio (SR1) for normal brake operation in a low input region (small pedal stepping force region), while in a high input region (large pedal stepping force region) it is set equal to the size of a servo ratio (SR1) during normal brake operation. That is, the threshold line for starting the BA operation is adjustable for low input and high input. And even if the brake pedal is stepped at a stepping speed not less than the set speed in spite of not being in an emergency, the BA operation is not performed; thus, unnecessary BA operation is prevented. In an emergency and when the brake pedal is stepped at a stepping speed not less than the set speed and with more than a set stepping force, the BA operation is performed.

Description

technical field [0001] The present invention belongs to the technical field of a negative pressure booster used in devices such as a brake booster, and in particular to a negative pressure booster capable of obtaining a larger output than a normal operation during an emergency operation such as an emergency braking operation. The technical field of the device. Background technique [0002] Conventionally, in the braking system of automobiles such as passenger cars, negative pressure boosters that use negative pressure for brake boosters have been used. In this existing general negative pressure booster device, the power piston is divided into a constant pressure chamber into which negative pressure is usually introduced and a variable pressure chamber in which the pressure can change. In addition, when the brake pedal is generally stepped on to perform a normal braking operation, the input shaft advances to switch the control valve, thereby introducing atmospheric air into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/573B60T8/00B60T13/66B60T8/32B60T13/569
CPCB60T13/569B60T13/573B60T8/3275B60T13/66
Inventor 井上英文高崎良保
Owner BOSCH CORP
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