JPS5948256A - Booster for brake - Google Patents

Abstract

PURPOSE:To prevent a power piston and a shell from rotating relatively to each other, by a method wherein a plurality of projections are provided on the inside surface of an opening provided at one end part of a sealing boot surrounding reinforcing tie bolts for a shell, and the gap between the projections and the tie bolts is set to be small. CONSTITUTION:In the interior of a shell 1, a sealing boot 7 is provided which surrounds a plurality of the tie bolts 6, one end of the boot 7 is fixed to a front shell 1a, and the other end is airtightly fixed to tie bolt penetrating parts of a piston plate 2a and a diaphragm 3. The other end of the boot 7 is opened into a rear chamber 9 of the shell, and a plurality of the projections 7a are provided on the inside surface of the opening part. The projections 7a are faced to the tie bolts 6 with a small spacing provided therebetween so that the projections 7a normally do not contact the bolts 6. Accordingly, since a rotating force exerted on a piston 2 in operation is received by the contact of the projections 7a with the tie bolts 6, relative rotation of the shell and the piston is restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is directed to a brake doubler that uses vacuum pressure or air pressure to amplify and output one force. 11J1 to the brake booster.

(b) Prior Art A brake booster having a single circular shell and power piston is well known in the art. A booster device is also well known in which a power piston is passed through a tie bolt, which is covered with a sealing boot, inside the circular shell to reduce load bearing. However, with a booster that uses this pressure difference, the shell and power piston can be made into a non-circular cross-section, such as an oval, a cabinet, or a rectangular shape with rounded corners.
Despite the various advantages that can be obtained, such as the possibility of developing a new shell structure, it has not yet been developed into a commercial product.

If PJ ', this σ脣i1j, I7f force ＞＼ｼ is,
The power piston is unstable (and guided) through the rolling diaphragm, and the power piston has a non-circular (cross-section) shell and the rolling diaphragm is accompanied by the outer circumferential wall of the power piston. Changes in circumferential length are different for each rolling part, that is, the smaller the radius of curvature of the power piston's outer shape r (1
This is because a relative rotational force is generated between the shell and the power piston, which interferes with the smooth movement of the piston and may cause troubles such as friction, which is a major hindrance to practical use.

The details of the brake booster with shell reinforcement tie bolts are as follows, even when the shell and power piston are circular.
T and shell G to avoid contact between tie bolt and piston.
It is necessary to regulate the rotation of the piston in response to this, and therefore, if this problem of rotation can be solved, it will greatly benefit industry.

(c) This invention is a first means of solving the problem.
This was done in consideration of the above, and one of its main features is the non-circular 1:1
In order to provide a trouble-free brake boosting device that is practical and trouble-free, the present invention provides a means for cooling the target.
fil〆F's sealing boot is overturned, and the power piston is moved to i5(', i!I'l).
・Internal support (・brake boost)
Here, a plurality of solid protrusions are provided on the inner surface of the opening 11 of the sealing boot which protects the power piston. By setting it small, the power piston and shell σ) are made to have a relative rotation of 171i1 high.

(=) Actual 77 (Ii f column to F1 An embodiment of the present invention will be described with reference to the attached drawing Q.

Honjitsu (?ilj f'yIJ's double-curved existence is such that the shell 1, which is airtight inside and outside, is formed into a square shape with a rectangular core as an R curved surface, as shown in Fig. 1. The power piston 2 inserted into the shell 1 has a shape similar to the cross-sectional shape of the shell when viewed from the end 1m of the piston plate 2a. It is divided into two chambers by a rolling die A/flamm 3, which is supported by the joint part of the power piston 2 (the outermost section is the front shell 1a and the Lee I-shell 11).
One of the chambers (front chamber) 4 accommodates a piston return ring 5. Sara(Ko, Ciel Shi1)
Inside the interior, a plurality of tie bolts 6 that carry the load are parallel to the central axis of the device if and connect the power piston's play 1-2a and the diaphragm 3! The penetrating part that is 1n and jn is -1λ'
^(The front desk is la) Two-part interview + one set is fixed.
Konyabara style sealing boots 7I are airtightly sealed. The internal 11+1 shadow and operating principle of the piston 2 are well known υ) 11°f, , J5. i4
It's no different from the i position. That is, input 1ii11.13 is before [
When the river 1 and the rear chamber of the shell 9G air flowed, true ['
Due to the pressure difference between the filter 1'' and the chamber 4, the force is dissipated and output via the output shaft 10.

Now, Q) One end of the booster which performs the force i'+lf of the shell is held by the piston plate 2a and moves to the piston and one end of the sealing boot 7 (7). T-piece 1 that pulls the air in and out of the boots.
6. Normally, 1i11-11! ! 5 surrounds the tie bolt with a clearance of 1.
In the light, as shown in Figure 21 and Figure 3, on the inner surface of the opening 1 of this boot: f,) J relief protrusion, 7a,
Preferably, the protrusions 7a are provided at regular intervals in the circumferential direction (this is different from the follower λ().
ζ Two suburbs 1 Shiku・'b''? (ko; Wjl: and face each other,
usually? It is desirable to keep the tire flam rolling r'ilf 3 a from changing in circumference (specifically, this first).
(Group 1 in part α in Figure 1) The change is large) G 11μ Therefore, the turning force acting on the piston 2 is caused by the contact of the protrusion 7a to the tie bolt. It is possible to control the relative curvature between the shell and the piston, which has a non-circular cross section, to a small extent without hindering the entry and exit of the atmosphere.

Please note that the protrusion does not necessarily have to be integrated with the boot.
For example, as shown in No. 4j'X1 and FIG.
A cylindrical portion lAl1 made of rubber or blanks may be attached to the inner surface G of the opening 1 of the boot 7, and a protrusion 10a similar to that described in -lx may be formed in this portion.

: f: 1 ko, Honzu 6 light σ] 1: zu i upper case is 1 Σ゛ (1 vacuum 11 It also extends.

G-10 effect mark, 1 degree, explained, this invention is based on the power piston 1, r', and the shell's draw tie bolt is 4 f, and the opening 1 of one end of the sealing boot is ``A protrusion φ of the vent hole is provided on the inner surface, and the clearance between this protrusion and the tie bolt is made smaller by the part G. Defense 1 Now,
The space efficiency is high, and the reinforcement groove 1f47 etc. is 1111 degrees.
I hope we can create a brake booster.

tf If the shell and power piston are circular (here, accordingly, the phase of both; +!J'I'l<
J times 11 (ξ can be controlled within a small range (this 1, i7).

[Brief explanation of the drawing]

FIG. 1 shows an example of a force position according to the present invention.
1-Front view, Figure 2 is a cross-sectional view taken along line A-A, Figure 3 is a cross-sectional view taken along line B-B O in Figure 2, and Figure 4 is a cross-sectional view taken along line A-A in Figure 2. Fig. 5 is a top view showing the 4th part of the J2o) CC line G. 1.Shell, 2.Power piston, 2a.Brate, 3.Tire flam, 6.Tieholt, 7.
-Sea Link Boots, 7a...Tsu/1g, 11...
Cylindrical portion (O, 11a, protrusion) Patent applicant Sumitomo Electric Industries, Ltd. Agent
Sickle 1) Sentence 2nd M 1a 3a / 13 2a ' Ko B 4゛9 -6 1 'l 7a 8 / th; (item 121ζ1; figure 41ヶ1

Claims (1)

[Claims] (1) Covered by the sealing boot and passing through the power piston, the shell is reinforced by the tie bolt number 1ri-4, and in the brake booster, the inner surface of the opening 11 at one end of the sealing boot where the power piston is held. A plurality of protrusions are provided on the
By setting the clearance of l sufficiently small, the relative transmission between the shell and the power piston during operation can be adjusted to
A brake booster featuring L1 control. +21, , -1=The protrusion is formed integrally with the sealing boot,
Brake booster 8i3+ described in section 1)
(1) The brake booster according to claim 11, characterized in that the front member is made of rubber or plastic. 4S +
Brake booster +'FI described in item 31:.