JP2011240865A - Negative pressure type booster - Google Patents

Negative pressure type booster Download PDF

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JP2011240865A
JP2011240865A JP2010116156A JP2010116156A JP2011240865A JP 2011240865 A JP2011240865 A JP 2011240865A JP 2010116156 A JP2010116156 A JP 2010116156A JP 2010116156 A JP2010116156 A JP 2010116156A JP 2011240865 A JP2011240865 A JP 2011240865A
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valve piston
negative pressure
assembled
backward
valve
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Yoichi Terasaki
陽一 寺崎
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Advics Co Ltd
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Advics Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To improve assemblability when a control mechanism which can supplement insufficiency of an operating force during operation of an emergency brake is attached to a valve piston, in a negative pressure type booster.SOLUTION: The negative pressure type booster includes an end member 72 arranged between an input member (41) and a reaction member 73 to receive a reaction from the reaction member 73 and the control mechanism 80 for controlling the movement of the end member 72. The control mechanism 80 includes an annular case 81 having the accommodating hole 81a of the end member 72 and attached between the valve piston 30 and the reaction member 73, an engaging member 82 attached to the annular case 81 so as to be diametrically movable and urged inward in the diametrical direction by a spring 83 to control the movement of the end member 72 in accordance with an amount of a forward movement of the input member (41) relative to the valve piston 30 and a rod shaped transmitting member 84 attached to the valve piston 30, moving forward and backward in accordance with the diametrical movement of the engaging member 82 and pressed by a key member 71 when the valve piston 30 is returned to an original position to return the engaging member 82 to an initial position.

Description

本発明は、車両用ブレーキ装置に採用される負圧式倍力装置に関し、特に、運転者が慌ててブレーキペダルを踏み込んだ時のような緊急ブレーキ操作時におけるブレーキペダル踏力(操作力)の不足を補うことができるように構成した負圧式倍力装置に関するものである。   The present invention relates to a negative pressure type booster used in a vehicle brake device, and in particular, a shortage of brake pedal depression force (operating force) during an emergency brake operation such as when a driver rushes and depresses a brake pedal. The present invention relates to a negative pressure type booster configured to be able to compensate.

この種の負圧式倍力装置の一つとして、内部に圧力室を形成するハウジングと、このハウジング内に前進後退可能に組付けられて前記圧力室を前方の負圧室と後方の変圧室とに区画する可動隔壁と、前記ハウジングに前進後退可能に組付けられて前記ハウジング内に収容されている前端部にて前記可動隔壁に結合されたバルブピストンと、このバルブピストン内にて同バルブピストンに対し前進後退可能に設置されかつ外部からの操作力を受ける入力部材と、前記バルブピストンの前端部に組付けられて前記バルブピストンの推進力を外部に出力する出力部材と、前記バルブピストン内にて前記入力部材と前記出力部材間に介装されて前記出力部材に作用する力の反力を前記バルブピストンと前記入力部材に分けて伝達する反力部材とを備えるとともに、前記入力部材に設けた大気弁座とにより前記変圧室と大気との連通・遮断を制御する大気制御弁部と前記バルブピストンに設けた負圧弁座とにより前記変圧室と前記負圧室との連通・遮断を制御する負圧制御弁部を有して前記バルブピストン内に組付けられた制御弁を備え、さらに、
前記入力部材と前記バルブピストンに対して前進後退可能に組付けられて前記入力部材の前記バルブピストンに対する前進後退移動の限度を規定するとともに前記バルブピストンの前記ハウジングに対する後退移動の限度を規定するキー部材と、前記入力部材の先端部と前記反力部材の後端部間に前進後退可能に配置されて前端面にて前記反力部材と当接可能で後端面にて前記入力部材に係合・離脱可能な先端部材と、前記入力部材の前記バルブピストンに対する前進量が所定値以下の場合には、前記先端部材を前記入力部材と一体的に前進後退移動可能とし、前記入力部材の前記バルブピストンに対する前進量が所定値より大きい場合には、前記先端部材を前記入力部材から離脱した状態で前記バルブピストンに対して固定可能とする制御機構を備えている負圧式倍力装置があり、例えば下記特許文献1に記載されている。なお、後方とは、負圧式倍力装置に対してブレーキペダル側あるいは車両後方側を意味し、前方とは、負圧式倍力装置に対してブレーキマスタシリンダ側あるいは車両前方側を意味する。
As one of the negative pressure type boosters of this type, a housing that forms a pressure chamber therein, a pressure chamber that is assembled in the housing so as to be capable of moving forward and backward, and a negative pressure chamber in the front and a rear variable pressure chamber, A movable partition that is partitioned into a housing, a valve piston that is assembled to the housing so as to be capable of moving forward and backward, and is coupled to the movable partition at a front end portion accommodated in the housing, and the valve piston in the valve piston An input member that can be moved forward and backward and receives an operating force from the outside, an output member that is assembled to the front end portion of the valve piston and outputs the driving force of the valve piston to the outside, and the valve piston And a reaction force member that is interposed between the input member and the output member and transmits a reaction force acting on the output member separately to the valve piston and the input member. In addition, the variable pressure chamber and the negative pressure chamber are provided by an atmospheric control valve portion for controlling communication / blocking between the variable pressure chamber and the atmosphere by an atmospheric valve seat provided in the input member, and a negative pressure valve seat provided in the valve piston. A control valve assembled in the valve piston having a negative pressure control valve portion for controlling communication / blocking with the valve,
A key that is assembled to the input member and the valve piston so as to be capable of moving forward and backward, and that defines a limit for the forward and backward movement of the input member relative to the valve piston and that defines a limit for the backward movement of the valve piston relative to the housing. A member and a front end portion of the input member and a rear end portion of the reaction force member are disposed so as to be able to advance and retreat, and can be brought into contact with the reaction force member at a front end surface and engaged with the input member at a rear end surface. When the advanceable amount of the detachable tip member and the input member relative to the valve piston is less than a predetermined value, the tip member can be moved forward and backward integrally with the input member, and the valve of the input member When the forward movement amount with respect to the piston is larger than a predetermined value, the control can be fixed to the valve piston in a state in which the tip member is detached from the input member. There is vacuum booster which has a structure, for example, described in Patent Document 1. Note that the rear means the brake pedal side or the vehicle rear side with respect to the negative pressure booster, and the front means the brake master cylinder side or the vehicle front side with respect to the negative pressure booster.

特開2009−132216号公報JP 2009-132216 A

上記した特許文献1に記載されている負圧式倍力装置では、前記制御機構が、前記バルブピストンに径方向にて移動可能に組付けられてスプリングによって径内方に向けて付勢され、前記入力部材の前記バルブピストンに対する前進量が所定値以下の場合には、初期位置(径外方位置)にあって前記先端部材の前記バルブピストンに対する前進後退移動を許容し、前記入力部材の前記バルブピストンに対する前進量が所定値より大きい場合には、初期位置から径内方に移動して前記先端部材の前記バルブピストンに対する後退移動を制限する係止部材と、前記バルブピストンに前進後退移動可能に組付けられていて前記係止部材に係合しており前記係止部材の径方向移動に応じて前後方向に移動する伝達部材と、前記キー部材とは別個に構成されて前記入力部材と前記バルブピストンに対して前進後退移動可能に組付けられており前記バルブピストンが原位置(ハウジングに対する後退限度位置)に復帰するとき前記伝達部材を介して前記係止部材を初期位置に復帰させる解除部材を備えている。   In the negative pressure booster described in Patent Document 1 described above, the control mechanism is assembled to the valve piston so as to be movable in the radial direction, and is biased radially inward by a spring. When the advance amount of the input member relative to the valve piston is less than or equal to a predetermined value, the forward movement of the tip member relative to the valve piston is allowed at the initial position (outward radial position), and the valve of the input member is permitted. When the forward movement amount with respect to the piston is larger than a predetermined value, a locking member that moves radially inward from the initial position to limit the backward movement of the tip member with respect to the valve piston, and the valve piston can be moved forward and backward. A transmission member that is assembled and engaged with the locking member and moves in the front-rear direction in accordance with the radial movement of the locking member, and the key member are configured separately When the valve piston returns to its original position (reverse limit position with respect to the housing), it is assembled with the input member and the valve piston. A release member for returning to the initial position is provided.

ところで、上記した特許文献1に記載されている負圧式倍力装置では、制御機構の構成部材である係止部材、スプリング、伝達部材、解除部材等がそれぞれバルブピストンに直接組付けられるように構成されている。しかも、係止部材と解除部材がバルブピストンの前進後退移動方向(軸方向)に対して直交する径方向に組付けられ、スプリングがバルブピストンの外周に組付けられ、伝達部材がバルブピストンの前進後退移動方向(軸方向)に沿って組付けられている。このため、上記した特許文献1に記載されている負圧式倍力装置では、制御機構の構成部材をバルブピストンに組付ける際に、バルブピストンに対して多方向からの組付作業が必要であり、組付性に改善の余地がある。   By the way, in the negative pressure type booster described in the above-mentioned patent document 1, it is configured such that a locking member, a spring, a transmission member, a release member, etc., which are components of the control mechanism, are directly assembled to the valve piston. Has been. In addition, the locking member and the release member are assembled in the radial direction perpendicular to the forward and backward movement direction (axial direction) of the valve piston, the spring is assembled to the outer periphery of the valve piston, and the transmission member is advanced of the valve piston. It is assembled along the backward movement direction (axial direction). For this reason, in the negative pressure type booster described in Patent Document 1 described above, when the constituent members of the control mechanism are assembled to the valve piston, it is necessary to perform assembly work from multiple directions with respect to the valve piston. There is room for improvement in assembly.

また、上記した特許文献1に記載されている負圧式倍力装置では、入力部材に反力を伝達するための先端部材がバルブピストンに設けた収容孔に前進後退移動可能に組付けられている。このため、車両の要求仕様に応じて、外径の異なる複数種類の先端部材を製作するのに併せて、先端部材を前進後退移動可能に収容する収容孔の内径が異なる複数種類のバルブピストンを製作する必要がある。ところで、バルブピストンは先端部材に比して大きい部品であって、かかるバルブピストンを複数種類製作しなければならない従来の負圧式倍力装置は生産面で改善の余地がある。   Moreover, in the negative pressure type booster described in the above-mentioned Patent Document 1, a tip member for transmitting a reaction force to the input member is assembled in an accommodation hole provided in the valve piston so as to be capable of moving forward and backward. . For this reason, according to the required specifications of the vehicle, in addition to producing a plurality of types of tip members having different outer diameters, a plurality of types of valve pistons having different inner diameters of the receiving holes for accommodating the tip members so as to be capable of moving forward and backward are provided. Need to make. By the way, the valve piston is a larger component than the tip member, and there is room for improvement in the production of the conventional negative pressure type booster that has to produce a plurality of types of such valve pistons.

本発明は、上記した課題を解決するためになされたものであり、前記制御機構が、前記先端部材を前進後退移動可能に収容する収容孔を有して、前記バルブピストンの前端部と前記反力部材の後端部間に組付けられており、前端面にて前記反力部材と当接し後端面にて前記バルブピストンに当接する環状ケースと、この環状ケースに径方向にて移動可能に組付けられてスプリングによって径内方に向けて付勢され、前記入力部材の前記バルブピストンに対する前進量が所定値以下の場合には、初期位置にあって前記先端部材の前記バルブピストンに対する前進後退移動を許容し、前記入力部材の前記バルブピストンに対する前進量が所定値より大きい場合には、初期位置から径内方に移動して前記先端部材の前記バルブピストンに対する後退移動を制限する係止部材と、前記バルブピストンに前進後退移動可能に組付けられていて、前端部にて前記係止部材に係合し後端部にて前記キー部材に係合しており、前記係止部材の径方向移動に応じて前後方向に移動可能で、前記バルブピストンが原位置に復帰するとき前記係止部材を前記スプリングの付勢力に抗して初期位置に復帰させる棒状伝達部材とを備えていることに特徴がある。   The present invention has been made to solve the above-described problems, and the control mechanism has a receiving hole for receiving the tip member so as to be capable of moving forward and backward, and the front end portion of the valve piston and the reaction member are opposite to each other. An annular case that is assembled between the rear end portions of the force member, abuts against the reaction force member at the front end surface and abuts against the valve piston at the rear end surface, and is movable in the radial direction to the annular case. When the amount of advancement of the input member relative to the valve piston is less than or equal to a predetermined value when assembled and urged radially inward by a spring, the tip member is at the initial position and is advanced and retracted relative to the valve piston. When movement is permitted and the advance amount of the input member relative to the valve piston is greater than a predetermined value, the tip member moves backward from the initial position to the valve piston. A locking member that restricts movement, and is assembled to the valve piston so as to be able to move forward and backward, and engages with the locking member at the front end and engages with the key member at the rear end. The rod-shaped transmission is movable in the front-rear direction according to the radial movement of the locking member, and returns the locking member to the initial position against the biasing force of the spring when the valve piston returns to the original position. And a member.

この負圧式倍力装置においては、通常ブレーキ操作時、入力部材のバルブピストンに対する前進量が所定値以下であり、係止部材が初期位置にあって先端部材のバルブピストンに対する前進後退移動を許容する。このため、先端部材は入力部材と一体的に移動し、反力部材から先端部材に伝達される反力は入力部材に伝達される。   In this negative pressure type booster, during normal braking operation, the advance amount of the input member relative to the valve piston is less than a predetermined value, and the locking member is in the initial position to allow forward and backward movement of the tip member relative to the valve piston. . For this reason, the tip member moves integrally with the input member, and the reaction force transmitted from the reaction force member to the tip member is transmitted to the input member.

また、緊急ブレーキ操作時、入力部材のバルブピストンに対する前進量が所定値より大きくて、係止部材が初期位置から径内方に移動して先端部材のバルブピストンに対する後退移動を制限する。このため、先端部材は係止部材を介してバルブピストンと一体となり、反力部材から先端部材に伝達される反力は先端部材から係止部材を介してバルブピストンに伝達される。   Further, during an emergency brake operation, the advance amount of the input member relative to the valve piston is greater than a predetermined value, and the locking member moves radially inward from the initial position to limit the backward movement of the tip member relative to the valve piston. For this reason, the tip member is integrated with the valve piston via the locking member, and the reaction force transmitted from the reaction force member to the tip member is transmitted from the tip member to the valve piston via the locking member.

この結果、緊急ブレーキ操作時に反力部材から入力部材に伝達される反力が、通常ブレーキ操作時に比して、小さくなり、緊急ブレーキ操作時における倍力比(出力/入力)が通常ブレーキ操作時における倍力比に比して大きくなる。このため、緊急ブレーキ操作時のブレーキペダル踏力の不足を補うことができて、緊急ブレーキ操作時におけるブレーキの効きを、通常ブレーキ操作時におけるブレーキの効きに比して、向上させることが可能である。   As a result, the reaction force transmitted from the reaction member to the input member during an emergency brake operation is smaller than during a normal brake operation, and the boost ratio (output / input) during an emergency brake operation is reduced during normal brake operation. It becomes larger than the boost ratio at. For this reason, it is possible to compensate for the shortage of the brake pedal depression force at the time of emergency brake operation, and it is possible to improve the effectiveness of the brake at the time of emergency brake operation compared to the effectiveness of the brake at the time of normal brake operation. .

ところで、この負圧式倍力装置においては、制御機構の構成部材である環状ケース、係止部材、スプリング、棒状伝達部材等がバルブピストンに組付けられる前に、環状ケースに係止部材とスプリングを予め組付けて、これらを一体化(サブアセンブリ化)することが可能である。このため、入力部材とキー部材を組付けた状態のバルブピストンに対して、棒状伝達部材を前方から組付けるとともに、一体化された環状ケースと係止部材とスプリングを前方から組付けることで、制御機構の構成部材をバルブピストンに容易に組付けることができて、制御機構のバルブピストンへの組付性を改善することが可能である。なお、入力部材とキー部材を組付けた状態のバルブピストンに対して制御機構の構成部材を組付ける際に、バルブピストンの前方が上方となるようにバルブピストンを設置すれば、上述した前方からの組付方向が上方からの組付方向となる。   By the way, in this negative pressure type booster, before the annular case, the locking member, the spring, the rod-shaped transmission member, etc., which are components of the control mechanism are assembled to the valve piston, the locking member and the spring are attached to the annular case. These can be assembled in advance and integrated (sub-assembly). For this reason, with respect to the valve piston in a state where the input member and the key member are assembled, the rod-shaped transmission member is assembled from the front, and the integrated annular case, the locking member and the spring are assembled from the front, The components of the control mechanism can be easily assembled to the valve piston, and the assemblability of the control mechanism to the valve piston can be improved. In addition, when the valve piston is installed so that the front of the valve piston is upward when the component member of the control mechanism is assembled to the valve piston with the input member and the key member assembled together, Is the assembling direction from above.

また、この負圧式倍力装置においては、環状ケース(バルブピストンに比して小さい部品)に、先端部材を前進後退移動可能に収容する収容孔が設けられている。このため、車両の要求仕様に応じて、外径の異なる複数種類の先端部材を製作するのに併せて、先端部材を前進後退移動可能に収容する収容孔の内径が異なる複数種類の環状ケースを製作すればよくて、バルブピストンは一種類で製作すればよく、当該負圧式倍力装置の生産面を改善することが可能である。   In this negative pressure type booster, the annular case (parts smaller than the valve piston) is provided with an accommodation hole for accommodating the tip member so as to be capable of moving forward and backward. For this reason, according to the required specifications of the vehicle, in addition to producing a plurality of types of tip members having different outer diameters, a plurality of types of annular cases having different inner diameters of receiving holes for accommodating the tip members so as to be capable of moving forward and backward are provided. What is necessary is just to produce and the valve piston should just be produced with one kind, and it can improve the production surface of the said negative pressure type booster.

また、本発明の実施に際して、前記バルブピストンと前記環状ケースには、前記環状ケースの前記バルブピストンに対する周方向の位置を規定するための位置決め手段(凸部と凹部)が設けられていることも可能である。この場合には、一体化された環状ケースと係止部材とスプリング等のバルブピストンへの誤組付を防止することが可能であり、バルブピストンに組付けられる棒状伝達部材に対して、係止部材を的確に係合させることが可能である。さらに、負圧式倍力装置の作動中にバルブピストンと環状ケースの間の周方向の相対移動を規制し、係止部材を径方向に移動可能に保持する環状ケースと棒状伝達部材との摩擦や干渉を防止して棒状伝達部材の前後移動を円滑にすることで、棒状伝達部材による係止部材の初期位置への復帰を円滑にする。   In carrying out the present invention, the valve piston and the annular case may be provided with positioning means (projections and recesses) for defining a circumferential position of the annular case with respect to the valve piston. Is possible. In this case, it is possible to prevent erroneous assembly of the integrated annular case, the locking member, and the spring to the valve piston, and the rod-shaped transmission member assembled to the valve piston can be locked. It is possible to accurately engage the members. Further, during the operation of the negative pressure booster, the relative movement in the circumferential direction between the valve piston and the annular case is restricted, and the friction between the annular case and the rod-like transmission member that holds the locking member movably in the radial direction is reduced. By preventing the interference and making the rod-shaped transmission member move back and forth smoothly, the rod-shaped transmission member can smoothly return the locking member to the initial position.

また、本発明の実施に際して、前記環状ケースには、前記係止部材との係合によって前記係止部材の前記環状ケースに対する径内方への移動量を所定値に規定するストッパが設けられていることも可能である。この場合には、環状ケース、係止部材およびスプリングが一体化された際に、係止部材がスプリングによって径内方に押されてストッパと弾性的に係合し、環状ケースとスプリングによって係止部材が弾性的に保持される。したがって、環状ケースと係止部材とスプリングを一体化した後に、係止部材が環状ケースから脱落することを抑制することができて、一体化された部品の搬送性を良好とすることが可能である。   In carrying out the present invention, the annular case is provided with a stopper that regulates the amount of movement of the locking member relative to the annular case to a predetermined value by engagement with the locking member. It is also possible. In this case, when the annular case, the locking member and the spring are integrated, the locking member is pushed radially inward by the spring and elastically engages with the stopper, and is locked by the annular case and the spring. The member is held elastically. Therefore, after the annular case, the locking member, and the spring are integrated, it is possible to prevent the locking member from dropping from the annular case, and it is possible to improve the transportability of the integrated parts. is there.

本発明による負圧式倍力装置の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the negative pressure type booster by this invention. 図3の2−2線に沿った断面を展開して示すとともにバルブピストンと制御機構の関係を示した図1の要部拡大断面図である。FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 1, showing a section taken along line 2-2 of FIG. 図2の3−3線に沿った断面図(ハウジングの断面は省略)である。FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2 (the cross section of the housing is omitted). 図1および図2に示した環状ケース、係止部材、スプリングが一体化された状態の拡大正面図である。FIG. 3 is an enlarged front view of a state in which the annular case, the locking member, and the spring illustrated in FIGS. 1 and 2 are integrated. 図4に示した環状ケース、係止部材、スプリングの中央縦断側面図である。FIG. 5 is a central longitudinal side view of the annular case, the locking member, and the spring shown in FIG. 4. 図4および図5に示した環状ケース単体の正面図である。FIG. 6 is a front view of a single annular case shown in FIGS. 4 and 5. 図6に示した環状ケース単体の中央縦断側面図である。FIG. 7 is a central longitudinal side view of the annular case shown in FIG. 6. 図6に示した環状ケース単体の底面図である。It is a bottom view of the annular case single body shown in FIG. 図4および図5に示した係止部材単体の拡大正面図である。FIG. 6 is an enlarged front view of a single locking member shown in FIGS. 4 and 5. 図9に示した係止部材単体の側面図である。FIG. 10 is a side view of a single locking member shown in FIG. 9. 図9に示した係止部材単体の平面図である。FIG. 10 is a plan view of a single locking member shown in FIG. 9. 本発明による負圧式倍力装置の入力と出力の関係を示した線図である。It is the diagram which showed the relationship between the input and output of the negative pressure type booster by this invention. 本発明による負圧式倍力装置の変形実施形態を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the deformation | transformation embodiment of the negative pressure type booster by this invention.

以下に、本発明の一実施形態を図面に基づいて説明する。図1〜図11に示した負圧式倍力装置は、ハウジング10に組付けられた可動隔壁20とバルブピストン30を備えるとともに、バルブピストン30に組付けられた入力部材40と出力部材50と制御弁60とキー部材71等を備えている。また、この負圧式倍力装置は、入力部材40の先端部に組付けられた先端部材72と、この先端部材72のバルブピストン30に対する前進後退を制御する制御機構80を備えている。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The negative pressure type booster shown in FIGS. 1 to 11 includes a movable partition wall 20 and a valve piston 30 assembled to a housing 10, and controls an input member 40 and an output member 50 assembled to the valve piston 30. A valve 60 and a key member 71 are provided. The negative pressure booster includes a tip member 72 assembled at the tip of the input member 40 and a control mechanism 80 that controls the forward and backward movement of the tip member 72 relative to the valve piston 30.

ハウジング10は、図1に示したように、内部に圧力室Roを形成する前方シェル11と後方シェル12を備えていて、内部の圧力室Roが可動隔壁20によって負圧導入管13を通して負圧源(例えば、図示省略のエンジンの吸気マニホールド)に常時連通する前方の負圧室R1と、この負圧室R1と大気にそれぞれ連通・遮断する後方の変圧室R2とに区画されている。このハウジング10は、後方シェル12を気密的に貫通する複数本(図1では1本が示されている)のボルト14と、これに螺着されるナット(図示省略)を用いて、車体(図示省略)に固定されるように構成されている。また、ハウジング10の前方には、前方シェル11を気密的に貫通する複数本(図1では1本が示されている)のボルト15と、これに螺着されるナット16を用いて、ブレーキマスタシリンダ100が組付けられている。   As shown in FIG. 1, the housing 10 includes a front shell 11 and a rear shell 12 that form a pressure chamber Ro therein, and the internal pressure chamber Ro is negatively pressured through a negative pressure introducing pipe 13 by a movable partition wall 20. It is divided into a front negative pressure chamber R1 that always communicates with a source (for example, an intake manifold of an engine not shown), and a rear pressure chamber R2 that communicates with and shuts off the negative pressure chamber R1 and the atmosphere. The housing 10 includes a plurality of bolts 14 (one is shown in FIG. 1) penetrating the rear shell 12 in an airtight manner and nuts (not shown) screwed on the bolts 14. (Not shown). Further, in front of the housing 10, a plurality of bolts 15 (one is shown in FIG. 1) penetrating the front shell 11 in an airtight manner and nuts 16 screwed to the bolts 15 are used for braking. A master cylinder 100 is assembled.

可動隔壁20は、金属製のプレート21とゴム製のダイアフラム22とから成り、ハウジング10内に前進後退可能に組付けられている。ダイアフラム22は、その外周縁に形成されたビード部にて、後方シェル12の外周縁に設けられた折り返し部と前方シェル11とにより気密的に挟持されている。また、ダイアフラム22は、その内周縁に形成されたビード部にて、バルブピストン30の前方フランジ部外周に設けられた溝に、プレート21とともに気密的に固定されている。   The movable partition wall 20 includes a metal plate 21 and a rubber diaphragm 22 and is assembled in the housing 10 so as to be capable of moving forward and backward. The diaphragm 22 is airtightly sandwiched between the folded portion provided on the outer peripheral edge of the rear shell 12 and the front shell 11 at a bead portion formed on the outer peripheral edge thereof. The diaphragm 22 is airtightly fixed together with the plate 21 in a groove provided on the outer periphery of the front flange portion of the valve piston 30 at a bead portion formed on the inner peripheral edge thereof.

図1に示したブレーキマスタシリンダ100は、そのシリンダ本体101の後端部101aが前方シェル11に形成された中心筒部を貫通して負圧室R1内に気密的に突入し、またシリンダ本体101に形成されたフランジ部101bの後面が前方シェル11の前面に当接している。また、ブレーキマスタシリンダ100のピストン102は、シリンダ本体101から後方に突出して負圧室R1内に突入しており、出力部材50の先端によって前方に押動されるように構成されている。   The brake master cylinder 100 shown in FIG. 1 has a cylinder body 101 with a rear end portion 101a penetrating through a central cylindrical portion formed in the front shell 11 and airtightly entering the negative pressure chamber R1. The rear surface of the flange portion 101 b formed on 101 is in contact with the front surface of the front shell 11. Further, the piston 102 of the brake master cylinder 100 protrudes rearward from the cylinder main body 101 and enters the negative pressure chamber R1, and is configured to be pushed forward by the tip of the output member 50.

バルブピストン30は、ハウジング10内に収容されている前端部にて可動隔壁20に結合された中空状のピストンであって、円筒状に形成された部位にてハウジング10の後方シェル12に気密的かつ前進後退可能に組付けられており、ハウジング10の前方シェル11との間に介装されたスプリング31によって後方に付勢されている。また、バルブピストン30の軸心には、図2に示したように、前端面から後端面に向けて、反力室孔30a、反力室孔30aより小径のケース収納孔30b、プランジャ収納孔(段付孔)30c、プランジャ収納孔30cより大径のプランジャ収容孔30d、制御弁収納孔30e、フィルタ収納孔30f等からなり、前後方向に貫通する軸孔が設けられている。   The valve piston 30 is a hollow piston coupled to the movable partition 20 at the front end portion accommodated in the housing 10, and is airtight to the rear shell 12 of the housing 10 at a portion formed in a cylindrical shape. Further, it is assembled so as to be able to advance and retreat, and is urged rearward by a spring 31 interposed between the housing 10 and the front shell 11. Further, as shown in FIG. 2, the valve piston 30 has a reaction force chamber hole 30a, a case storage hole 30b having a smaller diameter than the reaction force hole 30a, and a plunger storage hole from the front end surface toward the rear end surface. (Stepped hole) 30c, a plunger accommodating hole 30d having a diameter larger than that of the plunger accommodating hole 30c, a control valve accommodating hole 30e, a filter accommodating hole 30f and the like, and a shaft hole penetrating in the front-rear direction is provided.

また、バルブピストン30には、ケース収納孔30bに対応して出力部材50の筒部51a後端を前進後退移動可能に収容する環状収容孔30gが同軸的に設けられるとともに、プランジャ収納孔30cに対応してキー部材挿通孔30hが径方向に設けられている。また、プランジャ収納孔30cの外周に、伝達部材収納孔30iが前後方向に沿って設けられている。また、バルブピストン30には、負圧室R1と制御弁収納孔30eを連通可能な二対の連通孔30j(図2および図3参照)が設けられていて、これら各連通孔30jの後端部には制御弁60の負圧制御弁部60aが着座可能な円弧状の負圧弁座30kが形成されている。   The valve piston 30 is coaxially provided with an annular housing hole 30g for accommodating the rear end of the cylindrical portion 51a of the output member 50 so as to be able to move forward and backward in correspondence with the case housing hole 30b. Correspondingly, a key member insertion hole 30h is provided in the radial direction. Further, a transmission member storage hole 30i is provided along the front-rear direction on the outer periphery of the plunger storage hole 30c. Further, the valve piston 30 is provided with two pairs of communication holes 30j (see FIGS. 2 and 3) capable of communicating the negative pressure chamber R1 and the control valve storage hole 30e, and the rear ends of these communication holes 30j. An arc-shaped negative pressure valve seat 30k on which the negative pressure control valve portion 60a of the control valve 60 can be seated is formed in the portion.

入力部材40は、バルブピストン30内にて同バルブピストン30に対し前進後退可能に設置されかつ外部からの操作力(入力)を受ける部材であり、バルブピストン30のケース収納孔30bから制御弁収納孔30eに収容されてバルブピストン30に対して軸方向(前後方向)に移動可能なプランジャ41と、このプランジャ41に球状先端部42aにて関節状に連結されて後端部42b(図1参照)にてブレーキペダル(図示省略)に連結される入力ロッド42を備えている。   The input member 40 is a member installed in the valve piston 30 so as to be capable of moving forward and backward with respect to the valve piston 30 and receiving an operating force (input) from the outside. A plunger 41 accommodated in the hole 30e and movable in the axial direction (front-rear direction) with respect to the valve piston 30, and a rear end portion 42b (see FIG. 1) connected to the plunger 41 in a joint shape by a spherical tip portion 42a. ) And an input rod 42 connected to a brake pedal (not shown).

プランジャ41は、図2にて示したように、先端小径部と中間部にてバルブピストン30のプランジャ収納孔(段付孔)30cに軸方向へ摺動可能に組付けられていて、バルブピストン30によってガイド支持されている。また、プランジャ41は、その先端小径部にて、バルブピストン30のケース収納孔30b内に突出していて、先端(前端面)にて、円柱形状に形成された先端部材72を介して、バルブピストン30の反力室孔30aに出力部材50の筒部51aとともに収容された反力部材73に係合可能であり、その後端には制御弁60の大気制御弁部60bに離座可能に着座する環状の大気弁座41aが形成されている。   As shown in FIG. 2, the plunger 41 is assembled in the plunger housing hole (stepped hole) 30c of the valve piston 30 so as to be slidable in the axial direction at the tip small diameter portion and the intermediate portion. 30 is supported by a guide. The plunger 41 protrudes into the case housing hole 30b of the valve piston 30 at the tip small diameter portion, and the valve piston via the tip member 72 formed in a cylindrical shape at the tip (front end surface). The reaction force member 73 accommodated in the reaction force chamber hole 30a of the output member 50 together with the cylinder portion 51a of the output member 50 can be engaged with the reaction force chamber hole 30a. An annular atmospheric valve seat 41a is formed.

反力部材73は、バルブピストン30内にて入力部材40と出力部材50間に先端部材72および環状ケース81とともに介装されたリアクションゴムディスクであり、その前端面にて出力部材50における後方部材51の後端面に当接し、その後端面にて、バルブピストン30の環状反力受け面30mと先端部材72の前端面に直接当接するとともに、環状ケース81を介してバルブピストン30の前端面(反力受け面)に間接的に当接するようになっていて、出力部材50に作用する力の反力をバルブピストン30と入力部材40(プランジャ41)に分けて伝達可能である。   The reaction force member 73 is a reaction rubber disk interposed between the input member 40 and the output member 50 in the valve piston 30 together with the tip member 72 and the annular case 81, and the rear member of the output member 50 on the front end surface thereof. 51 is in contact with the rear end surface of the valve piston 30 and directly contacts the front end surface of the annular reaction force receiving surface 30m of the valve piston 30 and the front end member 72 at the rear end surface. The reaction force of the force acting on the output member 50 can be divided and transmitted to the valve piston 30 and the input member 40 (plunger 41).

出力部材50は、バルブピストン30の推進力を外部に出力するものであり、反力部材73とともにバルブピストン30の反力室孔30aに軸方向へ移動可能に組付けられた後方部材51と、この後方部材51の先端部に一体的に組付けられた出力ロッド52(図1参照)によって構成されている。なお、後方部材51には、反力部材73を収容する筒部51aが形成されていて、この筒部51aの後端部はバルブピストン30の環状収容孔30g内に収容されている。また、出力ロッド52の先端は、図1に示したように、ブレーキマスタシリンダ100におけるピストン102の係合部に押動可能に当接している。   The output member 50 outputs the propulsive force of the valve piston 30 to the outside, and the rear member 51 assembled to the reaction force chamber hole 30a of the valve piston 30 together with the reaction force member 73 so as to be movable in the axial direction. It is comprised by the output rod 52 (refer FIG. 1) integrally assembled | attached to the front-end | tip part of this back member 51. FIG. The rear member 51 is formed with a cylindrical portion 51 a that accommodates the reaction force member 73, and the rear end portion of the cylindrical portion 51 a is accommodated in the annular accommodating hole 30 g of the valve piston 30. Further, as shown in FIG. 1, the tip of the output rod 52 abuts against the engaging portion of the piston 102 in the brake master cylinder 100 so as to be able to be pushed.

制御弁60は、上記した負圧制御弁部60aと大気制御弁部60bを有する環状の可動部60Aと、バルブピストン30の制御弁収納孔30eに形成された段部に気密的に嵌合固定された環状の固定部60Bと、環状の可動部60Aと環状の固定部60Bを連結する円筒状の伸縮部60Dによって構成されている。環状の可動部60Aは、入力ロッド42に組付けたリテーナ43間に介装したスプリングS1によって前方に向けて付勢されていて、前後方向に移動可能である。環状の固定部60Bは、環状のリテーナ61によってバルブピストン30に固定されていて、入力ロッド42に組付けたリテーナ43間に介装したスプリングS2によって前方に向けて付勢されている。   The control valve 60 is hermetically fitted and fixed to the annular movable portion 60A having the negative pressure control valve portion 60a and the atmospheric control valve portion 60b described above, and the step portion formed in the control valve housing hole 30e of the valve piston 30. The annular fixed portion 60B, and the cylindrical movable portion 60D that connects the annular movable portion 60A and the annular fixed portion 60B are configured. The annular movable portion 60A is biased forward by a spring S1 interposed between retainers 43 assembled to the input rod 42, and is movable in the front-rear direction. The annular fixing portion 60B is fixed to the valve piston 30 by an annular retainer 61, and is urged forward by a spring S2 interposed between retainers 43 assembled to the input rod.

スプリングS2は、バルブピストン30と入力部材40間に介装されて入力部材40をバルブピストン30に対して後方所定位置に向けて後方に付勢するリターンスプリングであり、前端にてリテーナ61を介してバルブピストン30に係合し、後端にてリテーナ43を介して入力部材40の入力ロッド42に係合している。リテーナ61は、バルブピストン30に組付けられていて、バルブピストン30の内孔段部に固定されており、制御弁60の固定部60Bをバルブピストン30に固定する機能をも備えている。リテーナ43は、入力ロッド42に組付けられていて、入力ロッド42の外周段部に固定されている。   The spring S2 is a return spring that is interposed between the valve piston 30 and the input member 40 and urges the input member 40 rearward toward the predetermined position with respect to the valve piston 30 via a retainer 61 at the front end. It engages with the valve piston 30 and engages with the input rod 42 of the input member 40 via the retainer 43 at the rear end. The retainer 61 is assembled to the valve piston 30, is fixed to the inner hole step portion of the valve piston 30, and has a function of fixing the fixing portion 60 </ b> B of the control valve 60 to the valve piston 30. The retainer 43 is assembled to the input rod 42 and is fixed to the outer peripheral step portion of the input rod 42.

負圧制御弁部60aは、バルブピストン30に形成された対の円弧状負圧弁座30kに着座・離座可能であり、円弧状負圧弁座30kへの着座によって負圧室R1と変圧室R2の連通を遮断し、円弧状負圧弁座30kからの離座によって負圧室R1と変圧室R2を連通させる。大気制御弁部60bは、プランジャ41に形成された環状の大気弁座41aに着座・離座可能であり、環状の大気弁座41aへの着座によって変圧室R2と大気の連通を遮断し、環状の大気弁座41aからの離座によって変圧室R2と大気を連通させる。   The negative pressure control valve portion 60a can be seated on and separated from a pair of arcuate negative pressure valve seats 30k formed on the valve piston 30, and the negative pressure chamber R1 and the variable pressure chamber R2 can be seated on the arcuate negative pressure valve seat 30k. And the negative pressure chamber R1 and the variable pressure chamber R2 are communicated with each other by separating from the arc-shaped negative pressure valve seat 30k. The atmospheric control valve portion 60b can be seated and separated from an annular atmospheric valve seat 41a formed on the plunger 41, and the communication between the variable pressure chamber R2 and the atmosphere is blocked by the seating on the annular atmospheric valve seat 41a. The atmosphere from the atmospheric pressure valve seat 41a is communicated with the variable pressure chamber R2.

キー部材71は、バルブピストン30に対するプランジャ41の軸方向移動(前進後退移動)の限度を規定するとともに、バルブピストン30のハウジング10に対する後退移動の限度(ハウジング10に対する後退限度位置、すなわち、原位置)を規定するためのものであり、プランジャ41とバルブピストン30に対して前進後退可能に組付けられていて、バルブピストン30に形成された径方向のキー部材挿通孔30hに挿通されている。キー部材71の前後方向の肉厚寸法は、キー部材挿通孔30hの前後方向寸法よりも小さくされていて、キー部材71はバルブピストン30に対して所定量だけ前後方向に移動可能である。   The key member 71 defines the limit of the axial movement (forward and backward movement) of the plunger 41 with respect to the valve piston 30 and the limit of the backward movement of the valve piston 30 with respect to the housing 10 (reverse limit position with respect to the housing 10, that is, the original position). ), And is assembled to the plunger 41 and the valve piston 30 so as to be able to advance and retreat, and is inserted into a radial key member insertion hole 30h formed in the valve piston 30. The thickness dimension of the key member 71 in the front-rear direction is smaller than the dimension in the front-rear direction of the key member insertion hole 30h, and the key member 71 is movable in the front-rear direction by a predetermined amount with respect to the valve piston 30.

このキー部材71は、バルブピストン30から径外方に突出した両端部(図3の上下両端部)の後端面にて後方シェル12に当接可能であり、ハウジング10に対するバルブピストン30の後方への移動限界位置(後退限度位置)は、図2に示すように、キー部材挿通孔30hの前方壁がキー部材71の前端面に当接しかつキー部材71の両端部の後端面が後方シェル12に当接した位置である。   The key member 71 can be in contact with the rear shell 12 at the rear end surfaces of both end portions (upper and lower end portions in FIG. 3) protruding radially outward from the valve piston 30, and to the rear side of the valve piston 30 with respect to the housing 10. As shown in FIG. 2, the movement limit position (retreat limit position) of the key member insertion hole 30 h is in contact with the front end surface of the key member 71, and the rear end surfaces of both end portions of the key member 71 are the rear shell 12. It is the position which contact | abutted.

また、キー部材71は、その中央部にて、プランジャ41の中央部に形成された環状溝の前後両端面41b,41cに当接可能であって、プランジャ41がバルブピストン30に組付けられた後に、バルブピストン30に組付けられている。バルブピストン30に対するプランジャ41の後方への移動限界位置は、環状溝の前端面41bがキー部材71の前端面に当接しかつキー部材71の後端面がキー部材挿通孔30hの後方壁に当接した位置である。また、バルブピストン30に対するプランジャ41の前方への移動限界位置は、環状溝の後端面41cがキー部材71の後端面に当接しかつキー部材71の前端面がキー部材挿通孔30hの前方壁に当接した位置である。   Further, the key member 71 can contact the front and rear end faces 41b and 41c of the annular groove formed in the central portion of the plunger 41 at the central portion, and the plunger 41 is assembled to the valve piston 30. Later, it is assembled to the valve piston 30. The rearward movement limit position of the plunger 41 with respect to the valve piston 30 is such that the front end surface 41b of the annular groove contacts the front end surface of the key member 71 and the rear end surface of the key member 71 contacts the rear wall of the key member insertion hole 30h. Is the position. Further, the forward movement limit position of the plunger 41 with respect to the valve piston 30 is such that the rear end surface 41c of the annular groove is in contact with the rear end surface of the key member 71 and the front end surface of the key member 71 is on the front wall of the key member insertion hole 30h. This is the abutting position.

先端部材72は、制御機構80の環状ケース81に設けた収容孔81aに前進後退移動可能に収容されていて、プランジャ41と反力部材73間に組付けられており、前端面にて反力部材73と当接可能で、後端面にてプランジャ41の前端面と係合・離脱可能(当接可能)である。この先端部材72は、バルブピストン30に対する前進後退を制御機構80によって制御されるように構成されている。   The distal end member 72 is accommodated in an accommodation hole 81a provided in the annular case 81 of the control mechanism 80 so as to be capable of moving forward and backward, and is assembled between the plunger 41 and the reaction force member 73. The member 73 can be brought into contact with the front end surface of the plunger 41 at the rear end surface, and can be engaged / disengaged (contact is possible). The tip member 72 is configured to be controlled by the control mechanism 80 to move forward and backward with respect to the valve piston 30.

制御機構80は、入力部材40のバルブピストン30に対する前進量が所定値以下の場合(通常のブレーキ操作時)に、先端部材72をプランジャ41と一体的に前進後退移動可能とし、入力部材40のバルブピストン30に対する前進量が所定値より大きい場合(緊急ブレーキ操作時)に、先端部材72をプランジャ41から離脱した状態でバルブピストン30に対して固定可能とするものであって、図2に示したように、環状ケース81、係止部材82、ガータースプリング83、棒状伝達部材84を備えている。   The control mechanism 80 enables the tip member 72 to move forward and backward integrally with the plunger 41 when the advance amount of the input member 40 relative to the valve piston 30 is equal to or less than a predetermined value (during normal brake operation). When the forward movement amount with respect to the valve piston 30 is larger than a predetermined value (when an emergency brake operation is performed), the tip member 72 can be fixed to the valve piston 30 in a state of being detached from the plunger 41, as shown in FIG. As described above, an annular case 81, a locking member 82, a garter spring 83, and a rod-shaped transmission member 84 are provided.

環状ケース81は、図1および図2と図4〜図8に示したように、先端部材72を前進後退移動可能に収容する収容孔81aを軸心部に有していて、バルブピストン30の前端部と反力部材73の後端部間に組付けられており、前端面にて反力部材73と当接し後端面にてバルブピストン30に当接している。また、環状ケース81は、環状溝81bと収容溝81cを有するとともに、ストッパ81dと凹部81eを有している。   As shown in FIGS. 1, 2, and 4 to 8, the annular case 81 has an accommodation hole 81 a that accommodates the tip member 72 so as to be capable of moving forward and backward. It is assembled | attached between the front-end part and the rear-end part of the reaction force member 73, is contact | abutted with the reaction-force member 73 in the front end surface, and is contact | abutted to the valve piston 30 in the rear-end surface. The annular case 81 has an annular groove 81b and an accommodation groove 81c, and also has a stopper 81d and a recess 81e.

環状溝81bは、環状ケース81の軸方向中間部外周に形成されていて、ガータースプリング83が組付けられるように構成されている。収容溝81cは、環状ケース81の軸方向中間部から後端部に形成されていて、径方向に延びており、係止部材82を径方向に移動可能に収容している。ストッパ81dは、図5に示したように、係止部材82との係合によって係止部材82の環状ケース81に対する径内方への移動量を所定値に規定するものであり、収容溝81cの径内方部分に形成されている。凹部81eは、環状ケース81のバルブピストン30に対する組付位置を規定するためのものであり、環状ケース81の後端部に形成されていて、バルブピストン30に設けた凸部30n(図2参照)とにより位置決め手段を構成している。   The annular groove 81b is formed in the outer periphery of the intermediate portion in the axial direction of the annular case 81, and is configured to be assembled with the garter spring 83. The housing groove 81c is formed from the intermediate portion in the axial direction of the annular case 81 to the rear end portion, extends in the radial direction, and houses the locking member 82 so as to be movable in the radial direction. As shown in FIG. 5, the stopper 81d regulates the amount of movement of the locking member 82 radially inward with respect to the annular case 81 by engagement with the locking member 82, and the receiving groove 81c. It is formed in the diameter inside part. The concave portion 81e is for defining the assembly position of the annular case 81 with respect to the valve piston 30. The concave portion 81e is formed at the rear end portion of the annular case 81, and is a convex portion 30n provided on the valve piston 30 (see FIG. 2). ) Constitutes positioning means.

係止部材82は、図1、図2、図4、図5と図9〜図11に示したように、環状ケース81の収容溝81cに径方向へ移動可能に組付けられていて、径内方端が環状ケース81の収容孔81aに所定量突出可能に構成されており、ガータースプリング83によって径内方に向けて付勢されている。この係止部材82は、入力部材40のバルブピストン30に対する前進量が所定値以下の場合、初期位置(図2に示した径外方位置)にあって先端部材72のバルブピストン30に対する前進後退移動を許容し、入力部材40のバルブピストン30に対する前進量が所定値より大きい場合、初期位置から径内方に所定量移動して環状ケース81の収容孔81a内に突出し、先端部材72のバルブピストン30に対する後退移動を制限するものであり、直線状溝82a、段部82bおよび傾斜面部(カム部)82cを有している。   As shown in FIGS. 1, 2, 4, 5, and 9 to 11, the locking member 82 is assembled in the housing groove 81c of the annular case 81 so as to be movable in the radial direction. The inner end is configured to project a predetermined amount into the accommodation hole 81 a of the annular case 81, and is biased radially inward by a garter spring 83. When the amount of advancement of the input member 40 relative to the valve piston 30 is equal to or less than a predetermined value, the locking member 82 is in the initial position (the radially outward position shown in FIG. 2), and the tip member 72 moves forward and backward relative to the valve piston 30. When the movement is allowed and the advance amount of the input member 40 relative to the valve piston 30 is larger than a predetermined value, the input member 40 moves by a predetermined amount radially inward from the initial position and protrudes into the accommodation hole 81a of the annular case 81. It restricts the backward movement with respect to the piston 30 and has a linear groove 82a, a stepped portion 82b, and an inclined surface portion (cam portion) 82c.

なお、係止部材82が図2示した初期位置にあるとき、係止部材82の径内方端は先端部材72の外周面に摺動可能に当接していて、先端部材72のバルブピストン30に対する前進後退移動を許容している。また、係止部材82が図2示した初期位置から径内方に所定量移動して環状ケース81の収容孔81a内に突出したとき、係止部材82の径内方端は先端部材72の後端部端面72aに係合可能であり、先端部材72のバルブピストン30に対する後退移動を制限(規制)している。なお、上記した先端部材72の後端部端面72aは、先端部材72の後端部外周に環状の段部が形成された場合(図2に示した実施形態の場合)の環状面であり、先端部材72の後端部外周に環状の段部が形成されない場合の後端面である。   When the locking member 82 is in the initial position shown in FIG. 2, the radially inner end of the locking member 82 is slidably in contact with the outer peripheral surface of the tip member 72, and the valve piston 30 of the tip member 72. Is allowed to move forward and backward. When the locking member 82 moves a predetermined amount radially inward from the initial position shown in FIG. 2 and protrudes into the accommodation hole 81 a of the annular case 81, the radially inner end of the locking member 82 is the tip of the tip member 72. It is engageable with the rear end face 72a and restricts (restricts) the backward movement of the tip member 72 relative to the valve piston 30. Note that the rear end portion end surface 72a of the tip member 72 described above is an annular surface when an annular step is formed on the outer periphery of the rear end portion of the tip member 72 (in the case of the embodiment shown in FIG. 2). This is a rear end surface when an annular step is not formed on the outer periphery of the rear end of the front end member 72.

直線状溝82aは、係止部材82の径外方端部に形成されていて、ガータースプリング83の一部を収容可能である。段部82bは、係止部材82の前端部の径内方端部に形成されていて、環状ケース81に設けたストッパ81dに対して係合・離脱可能である。傾斜面部(カム部)82cは、係止部材82の後端部の径外方部分に形成されていて、図2に示したように、棒状伝達部材84の前端部と摺動可能に係合している。   The linear groove 82 a is formed at the radially outer end of the locking member 82 and can accommodate a part of the garter spring 83. The step portion 82 b is formed at the radially inner end portion of the front end portion of the locking member 82, and can be engaged / disengaged with respect to the stopper 81 d provided on the annular case 81. The inclined surface portion (cam portion) 82c is formed on the radially outer portion of the rear end portion of the locking member 82, and slidably engages with the front end portion of the rod-shaped transmission member 84 as shown in FIG. is doing.

ガータースプリング83は、環状ケース81の軸方向中間部外周に設けた環状溝81bと係止部材82の径外方端部に設けた直線状溝82aに組付けられていて、環状ケース81の外周と係止部材82の径外方端に弾性的に係合しており、係止部材82を環状ケース81の径内方(先端部材72を収容する収容孔81a内)に向けて付勢している。   The garter spring 83 is assembled with an annular groove 81 b provided on the outer periphery of the annular case 81 in the axial direction and a linear groove 82 a provided on the radially outer end of the locking member 82. Are elastically engaged with the radially outer end of the locking member 82, and the locking member 82 is urged toward the radially inner side of the annular case 81 (inside the accommodation hole 81a for accommodating the tip member 72). ing.

棒状伝達部材84は、図2に示したように、バルブピストン30に形成した伝達部材収納孔30iに前進後退移動可能に組付けられていて、前端部にて係止部材82の傾斜面部(カム部)82cに係合し、後端部にてキー部材71に係合しており(図3参照)、係止部材82の径方向移動に応じて前後方向に移動可能である。このため、棒状伝達部材84は、バルブピストン30が原位置(図2に示した後退限度位置)に復帰するとき、キー部材71によって前方に押されてバルブピストン30に対して前方に移動し、係止部材82をガータースプリング83の付勢力に抗して初期位置(図2に示した径外方位置)に復帰させることが可能である。   As shown in FIG. 2, the rod-shaped transmission member 84 is assembled in a transmission member housing hole 30i formed in the valve piston 30 so as to be capable of moving forward and backward. Part) 82c and is engaged with the key member 71 at the rear end (see FIG. 3), and is movable in the front-rear direction in accordance with the radial movement of the locking member 82. For this reason, when the valve piston 30 returns to the original position (retreat limit position shown in FIG. 2), the rod-shaped transmission member 84 is pushed forward by the key member 71 and moves forward with respect to the valve piston 30. The locking member 82 can be returned to the initial position (the radially outward position shown in FIG. 2) against the biasing force of the garter spring 83.

フィルタ91は、バルブピストン30のフィルタ収納孔30f内にて入力ロッド42間に装着されている。このフィルタ91にはバルブピストン30の摺動部を外周から保護するブーツ92に形成された複数個の通気孔92aを通して大気が流入可能である。ブーツ92は、前端部にてハウジング10における後方シェル12の後端筒部に嵌合固定され、後端部にて入力ロッド42の中間部外周に嵌合固定されている。   The filter 91 is mounted between the input rods 42 in the filter housing hole 30 f of the valve piston 30. Air can flow into the filter 91 through a plurality of vent holes 92 a formed in a boot 92 that protects the sliding portion of the valve piston 30 from the outer periphery. The boot 92 is fitted and fixed to the rear end cylinder portion of the rear shell 12 in the housing 10 at the front end portion, and is fitted and fixed to the outer periphery of the intermediate portion of the input rod 42 at the rear end portion.

上記のように構成したこの実施形態の負圧式倍力装置においては、通常ブレーキ操作時、入力部材40の前方移動に対するバルブピストン30の前方移動の応答遅れ(すなわち、入力部材40の前方移動に伴って、変圧室R2が負圧室R1との連通を遮断されて大気に連通し、変圧室R2に流入する大気によってバルブピストン30が前方に移動する際の作動遅れ)が少なくて、入力部材40とバルブピストン30との相対移動量(バルブピストン30に対する入力部材40の前進量)が所定値以下である。このため、先端部材72の後端部端面72aは係止部材82の前端部より前方に移動せず、係止部材82は、先端部材72によって径内方への移動を規制されていて、先端部材72のバルブピストン30に対する前進後退移動を許容する。このため、先端部材72は入力部材40のプランジャ41と一体的に移動し、反力部材73から先端部材72に伝達される反力は先端部材72から入力部材40のプランジャ41に伝達される。   In the negative pressure booster of this embodiment configured as described above, a response delay of the forward movement of the valve piston 30 with respect to the forward movement of the input member 40 during normal braking operation (that is, with the forward movement of the input member 40). Thus, the variable pressure chamber R2 is disconnected from the negative pressure chamber R1 and communicates with the atmosphere, and there is little delay in operation when the valve piston 30 moves forward due to the air flowing into the variable pressure chamber R2, and the input member 40 The relative movement amount between the valve piston 30 and the valve piston 30 (the advance amount of the input member 40 relative to the valve piston 30) is equal to or less than a predetermined value. Therefore, the rear end portion end surface 72a of the tip member 72 does not move forward from the front end portion of the locking member 82, and the locking member 82 is restricted from moving radially inward by the tip member 72. The member 72 is allowed to move forward and backward with respect to the valve piston 30. Therefore, the tip member 72 moves integrally with the plunger 41 of the input member 40, and the reaction force transmitted from the reaction force member 73 to the tip member 72 is transmitted from the tip member 72 to the plunger 41 of the input member 40.

一方、運転者が慌ててブレーキペダルを踏み込む緊急ブレーキ操作時には、入力部材40の前方移動に対するバルブピストン30の前方移動の応答遅れが多くて、入力部材40とバルブピストン30との相対移動量(バルブピストン30に対する入力部材40の前進量)が所定値より大きくなる。このため、先端部材72の後端部端面72aは係止部材82の前端部より前方に移動し、係止部材82は先端部材72による径内方への移動規制を解除される。したがって、ガータースプリング83のばね力により径内方に付勢されている係止部材82が、初期位置から径内方に移動して環状ケース81の収容孔81a内に突出し、先端部材72のバルブピストン30に対する後退移動を制限する。このため、先端部材72は係止部材82を介してバルブピストン30と一体となり、反力部材73から先端部材72に伝達される反力は先端部材72から係止部材82を介してバルブピストン30に伝達される。   On the other hand, during an emergency braking operation in which the driver rushes and depresses the brake pedal, there is a large response delay in the forward movement of the valve piston 30 with respect to the forward movement of the input member 40, and the relative movement amount between the input member 40 and the valve piston 30 (valve) (Advancing amount of the input member 40 with respect to the piston 30) becomes larger than a predetermined value. For this reason, the rear end portion end surface 72a of the tip member 72 moves forward from the front end portion of the locking member 82, and the locking member 82 is released from restricting movement of the tip member 72 in the radially inward direction. Therefore, the locking member 82 urged radially inward by the spring force of the garter spring 83 moves radially inward from the initial position and protrudes into the accommodation hole 81 a of the annular case 81, and the valve of the tip member 72. The backward movement with respect to the piston 30 is limited. Therefore, the tip member 72 is integrated with the valve piston 30 via the locking member 82, and the reaction force transmitted from the reaction force member 73 to the tip member 72 is transmitted from the tip member 72 via the locking member 82 to the valve piston 30. Is transmitted to.

この結果、緊急ブレーキ操作時に反力部材73から入力部材40のプランジャ41に伝達される反力が、通常ブレーキ操作時に比して、先端部材72の受圧面積相当分だけ小さくなり、緊急ブレーキ操作時における倍力比(出力/入力)が通常ブレーキ操作時における倍力比に比して大きくなる。このため、緊急ブレーキ操作時のブレーキペダル踏力の不足を補うことができて、緊急ブレーキ操作時におけるブレーキの効きを通常ブレーキ操作時におけるブレーキの効きに比して向上させることが可能である。なお、図12は、この実施形態の負圧式倍力装置において得られる特性線図であり、点a,bを経て点cに向けて上昇する特性線A1は、通常ブレーキ操作時のものであり、点a,dを経て点cに向けて上昇する特性線A2は、緊急ブレーキ操作時のものであってフルサーボ性能が得られる。   As a result, the reaction force transmitted from the reaction force member 73 to the plunger 41 of the input member 40 during an emergency brake operation is smaller by an amount corresponding to the pressure receiving area of the tip member 72 than during a normal brake operation. The boost ratio (output / input) at is larger than the boost ratio during normal braking operation. For this reason, it is possible to make up for a shortage of the pedal effort at the time of emergency brake operation, and it is possible to improve the effectiveness of the brake at the time of emergency brake operation compared to the effectiveness of the brake at the time of normal brake operation. FIG. 12 is a characteristic diagram obtained in the negative pressure booster of this embodiment, and a characteristic line A1 that rises toward point c via points a and b is that during normal braking operation. The characteristic line A2 rising toward the point c through the points a and d is obtained during an emergency brake operation, and full servo performance is obtained.

なお、上記した緊急ブレーキ操作後のブレーキ解除時には、バルブピストン30が図2に示した原位置に復帰するとき、キー部材71がハウジング10と当接して後方への移動を規制され、棒状伝達部材84を介して係止部材82をガータースプリング83のばね力に抗して初期位置(図2に示した径外方位置)に復帰させる。このため、係止部材82による先端部材72のバルブピストン30に対する後退移動制限が解除されて、先端部材72が図2に示した状態に復帰し、次のブレーキ動作に備えることになる。   When the brake is released after the emergency brake operation described above, when the valve piston 30 returns to the original position shown in FIG. 2, the key member 71 is in contact with the housing 10 and the rearward movement is restricted. The locking member 82 is returned to the initial position (the radially outward position shown in FIG. 2) against the spring force of the garter spring 83 via 84. Therefore, the restriction of the backward movement of the tip member 72 with respect to the valve piston 30 by the locking member 82 is released, and the tip member 72 returns to the state shown in FIG. 2 to prepare for the next braking operation.

ところで、この実施形態の負圧式倍力装置においては、制御機構80の構成部材である環状ケース81、係止部材82、ガータースプリング83、棒状伝達部材84等がバルブピストン30に組付けられる前に、環状ケース81に係止部材82とガータースプリング83を予め組付けて、図4および図5に示したように、これらを一体化(サブアセンブリ化)することが可能である。このため、入力部材40とキー部材71を組付けた状態のバルブピストン30に対して、棒状伝達部材84を前方から組付けるとともに、一体化された環状ケース81と係止部材82とガータースプリング83を前方から組付けることで、制御機構80の構成部材をバルブピストン30に容易に組付けることができて、制御機構80のバルブピストン30への組付性を改善することが可能である。なお、入力部材40とキー部材71を組付けた状態のバルブピストン30に対して制御機構80の構成部材を組付ける際に、バルブピストン30の前方が上方となるようにバルブピストン30を設置すれば、上述した前方からの組付方向が上方からの組付方向となる。   By the way, in the negative pressure type booster of this embodiment, before the annular case 81, the locking member 82, the garter spring 83, the rod-shaped transmission member 84, etc., which are constituent members of the control mechanism 80 are assembled to the valve piston 30. The locking member 82 and the garter spring 83 can be assembled to the annular case 81 in advance, and these can be integrated (sub-assembled) as shown in FIGS. For this reason, the rod-shaped transmission member 84 is assembled from the front with respect to the valve piston 30 in a state where the input member 40 and the key member 71 are assembled, and the integrated annular case 81, locking member 82, and garter spring 83 are assembled. By assembling from the front, the constituent members of the control mechanism 80 can be easily assembled to the valve piston 30 and the assembling property of the control mechanism 80 to the valve piston 30 can be improved. When assembling the constituent members of the control mechanism 80 with respect to the valve piston 30 in the state where the input member 40 and the key member 71 are assembled, the valve piston 30 is installed so that the front of the valve piston 30 is upward. For example, the assembly direction from the front described above is the assembly direction from above.

また、この負圧式倍力装置においては、環状ケース81(バルブピストン30に比して小さい部品)に、先端部材72を前進後退移動可能に収容する収容孔81aが設けられている。このため、車両の要求仕様に応じて、外径の異なる複数種類の先端部材72を製作するのに併せて、先端部材72を前進後退移動可能に収容する収容孔81aの内径が異なる複数種類の環状ケース81を製作すればよくて、バルブピストン30は一種類で製作すればよく、当該負圧式倍力装置の生産面を改善することが可能である。   In this negative pressure booster, the annular case 81 (a component smaller than the valve piston 30) is provided with an accommodation hole 81a for accommodating the tip member 72 so as to be capable of moving forward and backward. For this reason, according to the required specifications of the vehicle, in addition to producing a plurality of types of tip members 72 having different outer diameters, a plurality of types of housing holes 81a for accommodating the tip members 72 so as to be capable of moving forward and backward are different. The annular case 81 may be manufactured, and the valve piston 30 may be manufactured as a single type, and the production surface of the negative pressure booster can be improved.

また、この実施形態においては、バルブピストン30と環状ケース81に、環状ケース81のバルブピストン30に対する周方向の位置を規定するための位置決め手段(環状ケース81の凹部81eとバルブピストン30の凸部30n)が設けられている。このため、一体化された環状ケース81と係止部材82とガータースプリング83等のバルブピストン30への誤組付を防止することが可能であり、バルブピストン30に組付けられる棒状伝達部材84に対して、係止部材82を的確に係合させることが可能である。さらに、負圧式倍力装置の作動中にバルブピストン30と環状ケース81の間の周方向の相対移動を規制し、係止部材82を径方向に移動可能に保持する環状ケース81と棒状伝達部材84との摩擦や干渉を防止して棒状伝達部材84の前後移動を円滑にすることで、棒状伝達部材84による係止部材82の初期位置への復帰を円滑にする。   In this embodiment, the valve piston 30 and the annular case 81 are provided with positioning means for defining the circumferential position of the annular case 81 with respect to the valve piston 30 (the concave portion 81e of the annular case 81 and the convex portion of the valve piston 30). 30n). Therefore, it is possible to prevent erroneous assembly of the integrated annular case 81, the locking member 82, the garter spring 83 and the like to the valve piston 30, and the rod-shaped transmission member 84 assembled to the valve piston 30 On the other hand, the locking member 82 can be accurately engaged. Furthermore, the annular case 81 and the rod-shaped transmission member that restrict relative movement in the circumferential direction between the valve piston 30 and the annular case 81 during operation of the negative pressure type booster and hold the locking member 82 movably in the radial direction. By preventing friction and interference with 84 and making the rod-shaped transmission member 84 move back and forth smoothly, the rod-shaped transmission member 84 can smoothly return the locking member 82 to the initial position.

また、この実施形態においては、環状ケース81に、係止部材82との係合によって係止部材82の環状ケース81に対する径内方への移動量を所定値に規定するストッパ81dが設けられている。このため、環状ケース81、係止部材82およびガータースプリング83が一体化された際に、係止部材82がガータースプリング83によって径内方に押されてストッパ81dと弾性的に係合し、環状ケース81とガータースプリング83によって係止部材82が弾性的に保持される。したがって、環状ケース81と係止部材82とガータースプリング83を一体化した後に、係止部材82が環状ケース81から脱落することを抑制することができて、一体化された部品の搬送性を良好とすることが可能である。   In this embodiment, the annular case 81 is provided with a stopper 81d that regulates the amount of movement of the locking member 82 radially inward relative to the annular case 81 by engagement with the locking member 82. Yes. Therefore, when the annular case 81, the locking member 82, and the garter spring 83 are integrated, the locking member 82 is pushed radially inward by the garter spring 83 and elastically engages with the stopper 81d. The locking member 82 is elastically held by the case 81 and the garter spring 83. Therefore, after the annular case 81, the locking member 82, and the garter spring 83 are integrated, it is possible to prevent the locking member 82 from dropping from the annular case 81, and the transportability of the integrated parts is good. Is possible.

上記した実施形態においては、反力部材73からの反力を入力部材40またはバルブピストン30に伝達可能な先端部材72を円柱形状に形成して実施したが、図13に示した変形実施形態のように、反力部材73からの反力を入力部材40またはバルブピストン30に伝達可能な先端部材172を円筒形状(プランジャ41の前端小径部41dが軸方向に摺動可能に貫通する円筒形状)に形成して実施することも可能である。   In the above-described embodiment, the tip member 72 capable of transmitting the reaction force from the reaction force member 73 to the input member 40 or the valve piston 30 is formed in a columnar shape, but the modified embodiment shown in FIG. Thus, the tip member 172 that can transmit the reaction force from the reaction force member 73 to the input member 40 or the valve piston 30 has a cylindrical shape (a cylindrical shape in which the front end small-diameter portion 41d of the plunger 41 penetrates slidably in the axial direction). It is also possible to form and implement.

図13に示した変形実施形態においては、緊急ブレーキ操作時において、先端部材172の後端部端面172aが係止部材82の前端部より前方に移動すると、係止部材82がガータースプリング83のばね力により径内方に押されて初期位置から径内方に移動し環状ケース81の収容孔81a内に突出する。このため、先端部材172が、係止部材82によってバルブピストン30に対する後退移動を制限されて、係止部材82を介してバルブピストン30と一体となる。このとき、反力部材73からの反力は、先端部材172と係止部材82を介してバルブピストン30に伝達されるとともに、プランジャ41の先端部(入力部材40)に伝達されて、図12の点a,eを経て点cに向けて上昇する特性線A3(図12の仮想線参照)が得られる。   In the modified embodiment shown in FIG. 13, when the rear end portion end surface 172 a of the leading end member 172 moves forward from the front end portion of the locking member 82 during an emergency braking operation, the locking member 82 is a spring of the garter spring 83. It is pushed radially inward by the force, moves radially inward from the initial position, and projects into the accommodation hole 81 a of the annular case 81. For this reason, the distal end member 172 is restricted from moving backward with respect to the valve piston 30 by the locking member 82, and becomes integrated with the valve piston 30 via the locking member 82. At this time, the reaction force from the reaction force member 73 is transmitted to the valve piston 30 via the tip member 172 and the locking member 82, and is also transmitted to the tip portion (input member 40) of the plunger 41, as shown in FIG. A characteristic line A3 (see a virtual line in FIG. 12) that rises toward the point c through the points a and e is obtained.

また、上記した実施形態においては、一個の係止部材82を用いて本発明を実施したが、この係止部材の個数は適宜増加可能であり、2個以上の係止部材を用いて本発明を実施することも可能である。また、上記した実施形態においては、環状ケース81に組付けられて係止部材82を環状ケース81の径内方に向けて付勢するスプリングとしてガータースプリング83を用いて本発明を実施したが、このガータースプリング83に代えて同等の機能を有するスプリングを採用して本発明を実施することも可能である。また、上記した実施形態においては、シングル型の負圧式倍力装置に本発明を実施したが、本発明はタンデム型やトリプル型の負圧式倍力装置にも同様に実施可能であることは勿論のこと、特許請求の範囲に記載した範囲内において適宜変更して実施することが可能である。   In the above-described embodiment, the present invention is implemented using one locking member 82. However, the number of the locking members can be increased as appropriate, and the present invention can be performed using two or more locking members. It is also possible to implement. In the above-described embodiment, the present invention is implemented using the garter spring 83 as a spring assembled to the annular case 81 and biasing the locking member 82 toward the radially inner side of the annular case 81. Instead of the garter spring 83, it is possible to implement the present invention by adopting a spring having an equivalent function. In the above-described embodiment, the present invention is applied to a single negative pressure booster. However, the present invention can be similarly applied to a tandem or triple negative pressure booster. Of course, the present invention can be implemented with appropriate modifications within the scope of the claims.

10…ハウジング、20…可動隔壁、30…バルブピストン、30b…ケース収納孔、30i…伝達部材収納孔、30k…負圧弁座、30n…凸部、40…入力部材、41…プランジャ、41a…大気弁座、50…出力部材、60…制御弁、60a…負圧制御弁部、60b…大気制御弁部、71…キー部材、72…先端部材、73…反力部材、80…制御機構、81…環状ケース、81a…収容孔、81b…環状溝、81c…収容溝、81d…ストッパ、81e凹部、82…係止部材、82a…直線状溝、82b…段部、82c…傾斜面部(カム部)83…ガータースプリング、84…棒状伝達部材、Ro…圧力室、R1…負圧室、R2…変圧室 DESCRIPTION OF SYMBOLS 10 ... Housing, 20 ... Movable partition, 30 ... Valve piston, 30b ... Case accommodation hole, 30i ... Transmission member accommodation hole, 30k ... Negative pressure valve seat, 30n ... Convex part, 40 ... Input member, 41 ... Plunger, 41a ... Air | atmosphere Valve seat 50 ... Output member 60 ... Control valve 60a ... Negative pressure control valve portion 60b ... Atmospheric control valve portion 71 ... Key member 72 ... Tip member 73 ... Reaction force member 80 ... Control mechanism 81 An annular case, 81a ... an accommodation hole, 81b ... an annular groove, 81c ... an accommodation groove, 81d ... a stopper, 81e recess, 82 ... a locking member, 82a ... a linear groove, 82b ... a step, 82c ... an inclined surface part (cam part) 83) Garter spring, 84 ... Rod-shaped transmission member, Ro ... Pressure chamber, R1 ... Negative pressure chamber, R2 ... Transformer chamber

Claims (3)

内部に圧力室(Ro)を形成するハウジング(10)と、このハウジング内に前進後退可能に組付けられて前記圧力室を前方の負圧室(R1)と後方の変圧室(R2)とに区画する可動隔壁(20)と、前記ハウジングに前進後退可能に組付けられて前記ハウジング内に収容されている前端部にて前記可動隔壁に結合されたバルブピストン(30)と、このバルブピストン内にて同バルブピストンに対し前進後退可能に設置されかつ外部からの操作力を受ける入力部材(40)と、前記バルブピストンの前端部に組付けられて前記バルブピストンの推進力を外部に出力する出力部材(50)と、前記バルブピストン内にて前記入力部材と前記出力部材間に介装されて前記出力部材に作用する力の反力を前記バルブピストンと前記入力部材に分けて伝達する反力部材(73)とを備えるとともに、前記入力部材に設けた大気弁座(41a)とにより前記変圧室と大気との連通・遮断を制御する大気制御弁部(60b)と前記バルブピストンに設けた負圧弁座(30k)とにより前記変圧室と前記負圧室との連通・遮断を制御する負圧制御弁部(60a)を有して前記バルブピストン内に組付けられた制御弁(60)を備えた負圧式倍力装置において、
前記入力部材と前記バルブピストンに対して前進後退可能に組付けられて前記入力部材の前記バルブピストンに対する前進後退移動の限度を規定するとともに前記バルブピストンの前記ハウジングに対する後退移動の限度を規定するキー部材(71)と、
前記入力部材の先端部と前記反力部材の後端部間に前進後退可能に配置されて前端面にて前記反力部材と当接可能で後端面にて前記入力部材に係合・離脱可能な先端部材(72)と、
前記入力部材の前記バルブピストンに対する前進量が所定値以下の場合には、前記先端部材を前記入力部材と一体的に前進後退移動可能とし、前記入力部材の前記バルブピストンに対する前進量が所定値より大きい場合には、前記先端部材を前記入力部材から離脱した状態で前記バルブピストンに対して固定可能とする制御機構(80)を備えていて、
前記制御機構(80)が、
前記先端部材を前進後退移動可能に収容する収容孔(81a)を有して、前記バルブピストンの前端部と前記反力部材の後端部間に組付けられており、前端面にて前記反力部材と当接し後端面にて前記バルブピストンに当接する環状ケース(81)と、
この環状ケースに径方向にて移動可能に組付けられてスプリング(83)によって径内方に向けて付勢され、前記入力部材の前記バルブピストンに対する前進量が所定値以下の場合には、初期位置にあって前記先端部材の前記バルブピストンに対する前進後退移動を許容し、前記入力部材の前記バルブピストンに対する前進量が所定値より大きい場合には、初期位置から径内方に移動して前記先端部材の前記バルブピストンに対する後退移動を制限する係止部材(82)と、
前記バルブピストンに前進後退移動可能に組付けられていて、前端部にて前記係止部材に係合し後端部にて前記キー部材に係合しており、前記係止部材の径方向移動に応じて前後方向に移動可能で、前記バルブピストンが原位置に復帰するとき前記係止部材を前記スプリングの付勢力に抗して初期位置に復帰させる棒状伝達部材(84)と
を備えていることを特徴とする負圧式倍力装置。
A housing (10) that forms a pressure chamber (Ro) inside, and the pressure chamber is assembled into the housing so as to be able to advance and retreat, and the pressure chamber is divided into a front negative pressure chamber (R1) and a rear variable pressure chamber (R2). A movable partition wall (20) that is partitioned, a valve piston (30) that is assembled to the housing so as to be capable of moving forward and backward, and is coupled to the movable partition wall at a front end portion accommodated in the housing; And an input member (40) that can be moved forward and backward with respect to the valve piston and receives an operating force from the outside, and is assembled to the front end of the valve piston to output the propulsive force of the valve piston to the outside. An output member (50) and a reaction force of a force that is interposed between the input member and the output member in the valve piston and acts on the output member is divided into the valve piston and the input member. And an atmospheric control valve portion (60b) for controlling communication / blocking between the variable pressure chamber and the atmosphere by an atmospheric valve seat (41a) provided on the input member. The negative pressure valve seat (30k) provided in the valve piston has a negative pressure control valve portion (60a) for controlling communication / blocking between the variable pressure chamber and the negative pressure chamber, and is assembled in the valve piston. In the negative pressure type booster equipped with the control valve (60),
A key that is assembled to the input member and the valve piston so as to be capable of moving forward and backward, and that defines a limit for the forward and backward movement of the input member relative to the valve piston and that defines a limit for the backward movement of the valve piston relative to the housing. A member (71);
Arranged between the front end portion of the input member and the rear end portion of the reaction force member so as to be able to advance and retreat. The front end surface can contact the reaction force member, and the rear end surface can be engaged with and disengaged from the input member A tip member (72),
When the advance amount of the input member relative to the valve piston is less than or equal to a predetermined value, the tip member can be moved forward and backward integrally with the input member, and the advance amount of the input member relative to the valve piston is less than a predetermined value. If it is larger, it is provided with a control mechanism (80) that can be fixed to the valve piston in a state in which the tip member is detached from the input member,
The control mechanism (80)
It has an accommodation hole (81a) for accommodating the tip member so as to be able to move forward and backward, and is assembled between the front end portion of the valve piston and the rear end portion of the reaction force member. An annular case (81) in contact with the force member and in contact with the valve piston at the rear end surface;
In the case where the annular case is assembled so as to be movable in the radial direction and is urged inward in the radial direction by a spring (83). The tip member is allowed to move forward and backward with respect to the valve piston, and when the amount of advance of the input member relative to the valve piston is greater than a predetermined value, the tip member moves radially inward from the initial position to move the tip A locking member (82) for restricting the backward movement of the member with respect to the valve piston;
The valve piston is assembled so as to be able to move forward and backward, and engages with the locking member at the front end and engages with the key member at the rear end, and the radial movement of the locking member And a rod-shaped transmission member (84) that is movable in the front-rear direction and returns the locking member to the initial position against the biasing force of the spring when the valve piston returns to the original position. A negative pressure booster characterized by that.
請求項1に記載の負圧式倍力装置において、前記バルブピストンと前記環状ケースには、前記環状ケースの前記バルブピストンに対する周方向の位置を規定するための位置決め手段(凸部30n、凹部81e)が設けられていることを特徴とする負圧式倍力装置。   2. The negative pressure booster according to claim 1, wherein the valve piston and the annular case are provided with positioning means (a convex portion 30 n and a concave portion 81 e) for defining a circumferential position of the annular case with respect to the valve piston. A negative pressure type booster characterized by that. 請求項1または2に記載の負圧式倍力装置において、前記環状ケースには、前記係止部材との係合によって前記係止部材の前記環状ケースに対する径内方への移動量を所定値に規定するストッパ(81d)が設けられていることを特徴とする負圧式倍力装置。   The negative pressure type booster according to claim 1 or 2, wherein an amount of movement of the locking member radially inward with respect to the annular case is set to a predetermined value by engaging the locking member with the annular case. A negative pressure type booster provided with a stopper (81d) for defining.
JP2010116156A 2010-05-20 2010-05-20 Negative pressure type booster Pending JP2011240865A (en)

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