Brake boosting device

Patent metadata

Field	Value
Publication number	US-10300893-B2
Application number	US-201515315012-A
Country	US
Kind code	B2
Filing date	Jul 14, 2015
Priority date	Jul 16, 2014
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A brake boosting device wherein a vibration control member is provided to an end part of a return coil spring that is arranged inside a vehicle chamber and that is interposed between a booster body and an input rod. The vibration control member has provided thereto: a seat part that suppresses the vibration of the return coil spring and that is between the end part of the return coil spring and a support part that supports the end part; and a guide part that is provided integrally with the seat part and that fits with the inner periphery of the end part of the return coil spring at a prescribed radial tightening allowance.

First claim

The invention claimed is:

1. A brake boosting device,
wherein a vibration control member is provided at an end part of a return coil spring interposed between a booster body and an input rod, the return coil spring being disposed in a vehicle interior,
the vibration control member is provided with a seat part interposed between the end part of the return coil spring and a support part supporting the end part, the seat part suppressing vibrations of the return coil spring, and a guide part disposed integrally with the seat part, the guide part being fitted to an inner periphery or an outer periphery of the end part of the return coil spring via a predetermined radial tightening allowance,
the vibration control member being integral with a first end part of a boot, the boot extending in an axial direction and being disposed between the booster body and the input rod, the first end part of the boot being closer to the booster body than to the input rod, the boot including a second end part at an end of the boot opposite the first end part, the boot also including a bellows part positioned between the first end part and the second end part of the boot,
the first end part of the boot comprising a guide part, the guide part of the first end part of the boot comprising a cylindrical base part and a plurality of projections, the cylindrical base part being supported on the support part which is a cylindrical support part of the booster body, the cylindrical base part possessing an outer periphery and an inner periphery, the plurality of projections being provided on the cylindrical base part that is supported on the cylindrical support part of the booster body, the plurality of projections extending in the axial direction and being spaced apart from one another in a circumferential direction of the cylindrical base part, the plurality of projections being located on the inner peripheral surface of the cylindrical base part or the outer peripheral surface of the cylindrical base part, and
the plurality of projections including three or more outer peripheral projections provided at regular intervals in the circumferential direction on the outer periphery of the cylindrical base part and three or more inner peripheral projections provided at regular intervals in the circumferential direction on the inner periphery of the cylindrical base part, and the outer peripheral projections and the inner peripheral projections are alternately disposed with a phase difference in the circumferential direction.

2. The brake boosting device according to claim 1 ,
wherein the plurality of projections are arc-shaped projections, the plurality of arc-shaped projections being fitted to the inner periphery or the outer periphery of the end part of the return coil spring via the predetermined radial tightening allowance.

3. The brake boosting device according to claim 2 ,
wherein a connection portion between the seat part and the guide part is provided with an annular recess part in which is positioned the end part of the return coil spring.

4. The brake boosting device according to claim 1 ,
wherein a connection portion between the seat part and the guide part is provided with an annular recess part configured to house the end part of the return coil spring.

5. The brake boosting device according to claim 1 , wherein the outer peripheral projections are fitted into the inner periphery of the end part of the return coil spring via the predetermined radial tightening allowance.

6. The brake boosting device according to claim 1 , wherein the inner peripheral projections elastically engage an outer periphery of the cylindrical support part of the booster body.

7. A brake boosting device for a vehicle comprising
a booster body that includes a cylindrical support part, an input rod operatively connected to the booster body, a spring retainer connected to the input rod, a boot extending in an axial direction between the booster body and the input rod, a return coil spring disposed in an interior of the vehicle and including first and second end parts, a first vibration control member, and a second vibration control member;
the first vibration control member being made of vibration control material and comprising a seat part to suppress vibration of the return coil spring and a guide part disposed integrally with the seat part, the guide part being fitted to an inner periphery or an outer periphery of the end part of the return coil spring via a predetermined radial tightening allowance;
the second vibration control member being an end part of the boot, the end part of the boot constituting the second vibration control member comprising a seat part and a guide part integral with one another, the seat part of the second vibration control member being interposed between the second end part of the return coil spring and an end part of the booster body, the guide part of the second vibration control member comprising a cylindrical base part that is supported on the cylindrical support part of the booster body; and
the guide part of the second vibration control member comprising at least three outer peripheral projections provided at regular intervals in a circumferential direction on an outer periphery of the cylindrical base part and at least three inner peripheral projections provided at regular intervals in the circumferential direction on an inner periphery of the cylindrical base part, and the outer peripheral projections and the inner circumferential direction.

8. The brake boosting device according to claim 7 , wherein the inner peripheral projections elastically engage an outer periphery of the cylindrical support part of the booster body.

9. The brake boosting device according to claim 7 , wherein the outer peripheral projections elastically engage an inner periphery of the second end part of the return spring.

10. The brake boosting device according to claim 7 , further comprising a connection portion between the seat part and the guide part of the second vibration control member, the connection portion including an annular recess in which is positioned the second end part of the return coil spring.

Assignees

• Advics Co Ltd

Inventors

• Miwa Yuta
• Honda Tetsuya

Classifications

• G05G1/30

  Controlling members actuated by foot · CPC title

• F16F1/12

  Attachments or mountings {(F16F1/041, F16F13/02 take precedence; of combinations of vibration damper and mechanical spring for vehicle suspension units B60G15/02)} · CPC title

• F16F1/02

  made of steel or other material having low internal friction {(characterised by their special construction from fibre-reinforced plastics F16F1/366; spring units consisting of several springs F16F3/02; making springs from wire B21F35/00)}; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant · CPC title

• B60T11/18

  Connection thereof to initiating means · CPC title

• B60T17/221

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title