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Negative pressure type booster

一种助力器、负压型的技术，应用在负压型助力器领域，能够解决阈值易于变动、计时准确性减小、激活不稳定等问题，达到减少不稳定性、准确性增加、简单结构的效果

Inactive Publication Date: 2005-05-11
ADVICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the timing accuracy of disengagement is reduced, making the thresholds used to enable the emergency braking feature prone to variation
Therefore, the activation of the emergency brake tends to become unstable

Method used

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  • Negative pressure type booster
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Embodiments of the present invention will be described below with reference to the drawings. 1-3 show a negative pressure type booster according to the present invention. The negative pressure type booster includes a movable diaphragm 20 and a power piston 30 mountable to the casing 10 , and an input member 40 , an output member 50 , a spool valve 60 and a control valve 70 installed into the power piston 30 .

[0025] As shown in FIG. 1 , the case 10 includes a front case 11 and a rear case 12 . The front and rear shells 11 and 12 define a pressure chamber Ro therein. The movable diaphragm 20 divides the pressure chamber Ro into a constant pressure chamber R1 and a variable pressure chamber R2. The constant pressure chamber R1 is always in communication with the vacuum source through the vacuum introduction tube 13 . The flow is established / disconnected between the variable pressure chamber R2 and the constant pressure chamber R1 and between the variable pressure cha...

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PUM

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Abstract

The negative pressure booster includes a power piston, a slide valve and a holding mechanism, etc., and helps the driver during emergency braking. A retaining mechanism is adapted to retain the spool valve in a predetermined forward position and includes a detent member mounted to the power piston movable linearly in a radial direction, and a garter spring for biasing radially inwardly The locking element. The locking element has a hook capable of engaging with or disengaging from a hook provided on the slide valve. When the forward movement of the plunger relative to the power piston is greater than a predetermined value, the pushing slope arranged on the plunger pushes the driven slope arranged on the locking element radially inward, so that the locking element The hook is disengaged from the hook of the spool valve.

Description

technical field [0001] The present invention relates to a negative-pressure booster used in a vehicle braking system, and more particularly to a negative-pressure booster for compensating for insufficient force on a brake pedal and assisting a driver during emergency braking. Background technique [0002] Recent analysis has revealed that, in many cases, when the driver steps on the brake pedal urgently in the event of an obstacle in the vehicle's path, the vehicle cannot exhibit sufficient braking performance; i.e., during emergency braking , because the force applied by the driver on the brake pedal is relatively small compared to the force required to generate such high brake fluid pressures as to cause the wheels to lock. According to the analysis results, a device has been proposed and put into use, which judges whether the brake is a normal operation or an emergency operation according to the speed of depressing the brake pedal or the rate of increase of the hydraulic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/57B60T8/32B60T13/52B60T13/575B60T13/577
CPCB60T8/3275B60T13/52B60T13/575B60T13/577
Inventor 坪内薰井上阳治酒井智康高取叶子
Owner ADVICS CO LTD