JPH0734771Y2 - Negative pressure booster - Google Patents
Negative pressure boosterInfo
- Publication number
- JPH0734771Y2 JPH0734771Y2 JP1991049859U JP4985991U JPH0734771Y2 JP H0734771 Y2 JPH0734771 Y2 JP H0734771Y2 JP 1991049859 U JP1991049859 U JP 1991049859U JP 4985991 U JP4985991 U JP 4985991U JP H0734771 Y2 JPH0734771 Y2 JP H0734771Y2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- booster
- negative pressure
- diaphragm
- inner peripheral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
- B60T13/569—Vacuum systems indirect, i.e. vacuum booster units characterised by piston details, e.g. construction, mounting of diaphragm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/02—Diaphragms
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Diaphragms And Bellows (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、ブースタシェル内に前
後往復動自在に収容されるブースタピストンの背面に、
外周部をブースタシェルに結着させるダイヤフラムが重
合され、ブースタシェルで前後往復動自在に支承された
ピストンボスの背面には、ダイヤフラムの内周に設けら
れた抱持部がブースタピストンの内周部を抱持した状態
で弾発的に係合される負圧ブースタに関する。[Industrial application] The present invention is provided on the rear surface of a booster piston housed in a booster shell so as to be reciprocally movable back and forth.
The diaphragm that binds the outer periphery to the booster shell is superposed, and the holding part provided on the inner periphery of the diaphragm is located on the inner periphery of the booster piston on the back of the piston boss that is supported by the booster shell so that it can reciprocate back and forth. The present invention relates to a negative pressure booster that is elastically engaged in a state in which the user holds the item.
【０００２】[0002]
【従来の技術】従来、かかる負圧ブースタは、たとえば
実開昭６３−１０８８５３号公報等により知られてい
る。2. Description of the Related Art Conventionally, such a negative pressure booster is known from, for example, Japanese Utility Model Laid-Open No. 63-108853.
【０００３】[0003]
【考案が解決しようとする課題】図４において、上記従
来の負圧ブースタで用いられるダイヤフラム３′の抱持
部３ｃ′は、ピストンボスとの弾発的な係合状態では図
４の鎖線で示すようにブースタピストン４′の内周部４
ａ′を抱持しているものの、ピストンボスと係合してい
ない自由状態では、図４の実線で示すように、完全に抱
持した状態とはなっておらず、抱持部３ｃ′の一部３ｃ
5 ′が内周部４ａ′から離反する方向に広がっている。
これは、ダイヤフラム３′の型成形後の型抜きを容易と
するためである。In FIG. 4, the holding portion 3c 'of the diaphragm 3'used in the above-mentioned conventional negative pressure booster is indicated by the chain line in FIG. 4 when it is elastically engaged with the piston boss. As shown, the inner circumference 4 of the booster piston 4 '
In a free state in which a'is held but is not engaged with the piston boss, it is not in a completely held state as shown by the solid line in FIG. Part 3c
5 'the inner circumferential portion 4a' extends in a direction away from.
This is for facilitating the die-cutting of the diaphragm 3'after molding.
【０００４】ところが、上記従来のような形状のダイヤ
フラム３′では、ブースタピストン４′の内周部４ａ′
とともにダイヤフラム３′の抱持部３ｃ′をピストンボ
スの背面に係合する際に、前記抱持部３ｃ′の一部３ｃ
5 ′は前記内周部４ａダイヤフラムの前面に押し付けら
れて皺を生じ、ピストンボスおよび抱持部３ｃ′間のシ
ール性に問題が生じる。また負圧ブースタの組立時にダ
イヤフラム３′の内周にブースタピストン４′の内周部
４ａ′が確実に保持されておらず、組付け性が劣る。However, in the diaphragm 3'having the above conventional shape, the inner peripheral portion 4a 'of the booster piston 4'is.
At the same time, when the holding portion 3c 'of the diaphragm 3'is engaged with the rear surface of the piston boss, a part 3c of the holding portion 3c' is provided.
The 5'is pressed against the front surface of the diaphragm of the inner peripheral portion 4a to cause wrinkles, which causes a problem in the sealing property between the piston boss and the holding portion 3c '. Further, when the negative pressure booster is assembled, the inner peripheral portion 4a 'of the booster piston 4'is not securely held on the inner peripheral surface of the diaphragm 3', resulting in poor assembling performance.
【０００５】本考案は、かかる事情に鑑みてなされたも
のであり、ダイヤフラムの抱持部のシール性およびダイ
ヤフラムおよびブースタピストンの組付け性を向上させ
た負圧ブースタを提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a negative pressure booster in which the sealing property of the holding portion of the diaphragm and the assembling property of the diaphragm and the booster piston are improved. .
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本考案によれば、抱持部は、ピストンボスとの係合
を解除した自由状態でブースタピストンの内周部を弾発
的に抱持する形状に形成される。In order to achieve the above object, according to the present invention, the hugging portion elastically springs the inner peripheral portion of the booster piston in a free state where the engagement with the piston boss is released. It is formed into a shape to be held in the.
【０００７】[0007]
【実施例】以下、図面により本考案の一実施例について
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【０００８】先ず図１において、負圧ブースタＢにおけ
るブースタシェル１の前壁には、該ブースタＢにより作
動されるマスタシリンダＭが取付けられる。First, in FIG. 1, a master cylinder M operated by the booster B is attached to the front wall of the booster shell 1 of the negative pressure booster B.
【０００９】ブースタシェル１は、対向端を相互に結合
する前後一対のシェル半体１ａ，１ｂから構成され、該
ブースタシェル１内にはブースタピストン４が前後往復
動自在に収容される。このブースタピストン４の背面に
は、外周部３ａを両シェル半体１ａ，１ｂの衝合部間に
挟着されたゴム製ダイヤフラム３が重合され、該ダイヤ
フラム３の内周はブースタピストン４の内周とともに合
成樹脂製ピストンボス５の背面に弾発係合される。しか
もブースタピストン４およびダイヤフラム３によりブー
スタシェル１内は、ブースタピストン４の前面を臨ませ
る前方側の負圧室ＲA と、ダイヤフラム３の後面を臨ま
せる後方側の作動室ＲB とに区画される。The booster shell 1 is composed of a pair of front and rear shell halves 1a and 1b whose opposite ends are connected to each other, and a booster piston 4 is housed in the booster shell 1 so as to be reciprocally movable back and forth. On the back surface of the booster piston 4, a rubber diaphragm 3 having an outer peripheral portion 3a sandwiched between the abutting portions of the shell halves 1a and 1b is superposed, and the inner periphery of the diaphragm 3 is the inner portion of the booster piston 4. It is elastically engaged with the rear surface of the synthetic resin piston boss 5 along with the circumference. Moreover the booster shell 1 by the booster piston 4 and the diaphragm 3 is partitioned with the negative pressure chamber R A on the front side for exposing the front face of the booster piston 4, into the working chamber R B on the rear side for exposing the rear surface of the diaphragm 3 It
【００１０】ピストンボス５の後端には弁筒５ａが一体
に突設されており、この弁筒５ａは、ブースタシェル１
の後壁中央部に突設されて弁筒５ａを覆うとともに後端
部には大気導入口７を有する後方延長筒８に、ブッシュ
９およびシール部材１０を介して摺動自在に支承され
る。A valve cylinder 5a is integrally projectingly provided at the rear end of the piston boss 5, and the valve cylinder 5a is a booster shell 1.
A rear extension cylinder 8 which is provided at the center of the rear wall so as to cover the valve cylinder 5a and has an atmosphere introduction port 7 at the rear end is slidably supported via a bush 9 and a seal member 10.
【００１１】ブースタシェル１の前壁には負圧導入管１
１が連設されており、負圧室ＲA は該負圧導入管１１を
介して負圧源である内燃機関の吸気マニホールド（図示
せず）内に常時連通する。A negative pressure introducing pipe 1 is provided on the front wall of the booster shell 1.
1 is connected in series, and the negative pressure chamber R A is always connected via the negative pressure introducing pipe 11 to the intake manifold (not shown) of the internal combustion engine which is the negative pressure source.
【００１２】ブレーキペダル１２には入力杆１３が連結
されており、該入力杆１３に揺動可能に連結された弁ピ
ストン１４がピストンボス５に摺動可能に嵌合されてい
る。而して前記ブレーキペダル１２の操作に応じた入力
杆１３の進退作動による弁ピストン１４のピストンボス
５との相対移動に応じて切換作動する制御弁１５が、作
動室ＲB と、負圧室ＲA および大気導入口７との間に介
設されている。An input rod 13 is connected to the brake pedal 12, and a valve piston 14 swingably connected to the input rod 13 is slidably fitted to the piston boss 5. Thus, the control valve 15, which is switched according to the relative movement of the valve rod 14 with respect to the piston boss 5 by the forward / backward movement of the input rod 13 in response to the operation of the brake pedal 12, has a working chamber R B and a negative pressure chamber. It is provided between R A and the air inlet 7.
【００１３】制御弁１５は、前記弁ピストン１４と、ピ
ストンボス５の内壁に挟止されるゴム製弁体１６とを備
える従来周知のものであり、ブレーキペダル１２を操作
しない状態では負圧室ＲA および作動室ＲB 間の連通を
遮断するとともに両室ＲA ，ＲB の大気導入口７との連
通も遮断している。またブレーキペダル１２の操作によ
り弁ピストン１４がピストンボス５に対して前進する
と、制御弁１５は作動室ＲB を大気導入口７に連通さ
せ、さらに弁ピストン１４がピストンボス５に対して前
進作動すると、制御弁１５は負圧室ＲA を作動室ＲB に
連通させる。The control valve 15 is a conventionally well-known one that includes the valve piston 14 and a rubber valve body 16 that is held by the inner wall of the piston boss 5. The control valve 15 has a negative pressure chamber when the brake pedal 12 is not operated. The communication between R A and the working chamber R B is cut off, and also the communication between the two chambers R A and R B with the atmosphere introduction port 7 is cut off. When the valve piston 14 moves forward with respect to the piston boss 5 by operating the brake pedal 12, the control valve 15 communicates the working chamber R B with the atmosphere introduction port 7, and the valve piston 14 moves forward with respect to the piston boss 5. Then, the control valve 15 connects the negative pressure chamber R A to the working chamber R B.
【００１４】ピストンボス５には、その前面中心部に開
口する大径シリンダ孔１７と、そのシリンダ孔１７の後
部に同軸に連なる小径シリンダ孔１８とが設けられてお
り、小径シリンダ孔１８には、弁ピストン１４と一体あ
るいは弁ピストン１４の前面に当接する反力ピストン１
９が摺動自在に嵌合され、大径シリンダ孔１７には、ゴ
ム等から成る弾性ピストン２０および出力ピストン２１
が相互に当接して摺動自在に嵌合される。出力ピストン
２１の前面には出力杆２２が突設される。The piston boss 5 is provided with a large-diameter cylinder hole 17 opening at the center of the front surface thereof and a small-diameter cylinder hole 18 coaxially connected to the rear portion of the cylinder hole 17, and the small-diameter cylinder hole 18 is provided in the small-diameter cylinder hole 18. , A reaction force piston 1 that is integral with the valve piston 14 or abuts on the front surface of the valve piston 14.
9 is slidably fitted in the large-diameter cylinder hole 17 and an elastic piston 20 and an output piston 21 made of rubber or the like are provided.
Abut each other and are slidably fitted. An output rod 22 is provided on the front surface of the output piston 21 so as to project therefrom.
【００１５】ピストンボス５の前面には、大径シリンダ
孔１７からの出力ピストン２１の脱落を阻止すべく合成
樹脂製リテーナ２４が嵌合、当接されており、該リテー
ナ２４とブースタシェル１の前壁との間に縮設される戻
しばね２５により、ブースタピストン４は後退方向すな
わち作動室ＲB 側に常時付勢され、このブースタピスト
ン４の後退限はダイヤフラム３の後面に***して形成さ
れた突起３ｂがブースタシェル１の後壁内面に当接する
ことにより規制される。A synthetic resin retainer 24 is fitted and abutted on the front surface of the piston boss 5 in order to prevent the output piston 21 from coming off from the large-diameter cylinder hole 17. The retainer 24 and the booster shell 1 are connected to each other. The booster piston 4 is constantly urged in the retracting direction, that is, in the working chamber R B side by the return spring 25 that is contracted between the booster piston 4 and the front wall. The protrusion 3b thus formed is regulated by coming into contact with the inner surface of the rear wall of the booster shell 1.
【００１６】マスタシリンダＭの作動ピストン２３に
は、ブースタシェル１の前壁を同軸にかつ移動自在に貫
通するピストンロッド２３ａが同軸に連設されており、
該ピストンロッド２３ａには、後方側を開放した凹部２
７が同軸に設けられる。一方、出力ピストン２１に結合
された出力杆２２は、その先端を凹部２７の先端閉塞部
に当接させるべく該凹部２７内に同軸に挿入される。A piston rod 23a which coaxially and movably penetrates the front wall of the booster shell 1 is coaxially connected to the working piston 23 of the master cylinder M.
The piston rod 23a has a recessed portion 2 whose rear side is open.
7 is provided coaxially. On the other hand, the output rod 22 coupled to the output piston 21 is coaxially inserted into the recess 27 so that the tip of the output rod 22 abuts the tip closing portion of the recess 27.
【００１７】図２を併せて参照して、ピストンボス５に
は、ブッシュ９およびシール部材１０を介して後方延長
筒８に摺動自在に支承されている弁筒５ａの前端に段差
を介して同軸に連なる筒部５ｂと、後方側に臨む環状に
形成されて筒部５ｂの前端に連なる係止段部５ｃとが設
けられる。Referring also to FIG. 2, the piston boss 5 has a step at the front end of a valve cylinder 5a slidably supported by the rear extension cylinder 8 via a bush 9 and a seal member 10. A cylindrical portion 5b that is coaxially continuous and a locking step portion 5c that is formed in an annular shape facing the rear side and that is continuous with the front end of the cylindrical portion 5b are provided.
【００１８】一方、ダイヤフラム３の内周には、ブース
タピストン４の内周部４ａを抱持した状態で前記係止段
部５ｃに弾発的に係合される抱持部３ｃが設けられる。
すなわち金属板から成るブースタピストン４の内周部４
ａは、ピストンボス５を囲繞する円筒状の大円筒部４ａ
1 と、大円筒部４ａ1 の後端から半径方向内方に張出す
係合鍔部４ａ2 と、係合鍔部４ａ2 の内周縁から後方に
延びる小円筒部４ａ3と、小円筒部４ａ3 の後端から半
径方向内方に張出す鍔部４ａ4 と、該鍔部４ａ4 の内周
縁から後方側に折り返されて該鍔部４ａ4 の後面に結着
される折り返し部４ａ5 とを有するように屈曲成形され
る。またダイヤフラム３の抱持部３ｃは、前記大円筒部
４ａ1 の内周面および係合鍔部４ａ2 の前面を露出させ
ながら前記内周部４ａを弾発的に抱持するように成形さ
れるものであり、大円筒部４ａ1の外面に密着する大円
筒部３ｃ1 と、係合鍔部４ａ2 の背面に密着する係合鍔
部３ｃ2 と、小円筒部４ａ3 の外面に密着する小円筒部
３ｃ3 と、折り返し部４ａ5 の背面に密着すべく小円筒
部３ｃ3 の後端に連なる鍔部３ｃ4 と、鍔部４ａ4の前
面に密着すべく鍔部３ｃ4 の内周縁から前方側に折り返
される折り返し部３ｃ5 とを有する。しかも抱持部３ｃ
でブースタピストン４の内周部４ａを抱持した状態で、
折り返し部３ｃ5 の前面は、前記係合鍔部４ａ2 の前面
と面一となるように形成されており、折り返し部３ｃ5
は係合鍔部４ａ2 の前面とともに、前記ピストンボス５
の係止段部５ｃに後方側から当接される。On the other hand, on the inner circumference of the diaphragm 3, there is provided a holding portion 3c which is elastically engaged with the locking step portion 5c while holding the inner circumference portion 4a of the booster piston 4.
That is, the inner peripheral portion 4 of the booster piston 4 made of a metal plate
a is a cylindrical large cylindrical portion 4a surrounding the piston boss 5.
1, an engaging Gotsuba portion 4a 2 which overhangs radially inwardly from the rear end of the large cylindrical portion 4a 1, the small cylindrical portion 4a 3 extending rearward from the inner periphery of the engagement flange portion 4a 2, the small cylindrical portion from the rear end of 4a 3 and the flange portion 4a 4 which overhangs radially inwardly folded-back portion 4a 5 which is bound from the inner peripheral edge of the collar portion 4a 4 is folded back to the rear side to the rear surface of the collar portion 4a 4 Is bent and shaped to have The holding portion 3c of the diaphragm 3 is formed so as to elastically hold the inner peripheral portion 4a while exposing the inner peripheral surface of the large cylindrical portion 4a 1 and the front surface of the engaging collar portion 4a 2. The large cylindrical portion 3c 1 is in close contact with the outer surface of the large cylindrical portion 4a 1 , the engaging flange portion 3c 2 is in close contact with the rear surface of the engaging flange portion 4a 2 , and the outer surface of the small cylindrical portion 4a 3 is in close contact. Of the small cylindrical portion 3c 3 and the collar portion 3c 4 connected to the rear end of the small cylindrical portion 3c 3 so as to adhere to the back surface of the folded portion 4a 5 and the inside of the collar portion 3c 4 to adhere to the front surface of the collar portion 4a 4 . It has a folded-back portion 3c 5 which is folded back from the peripheral edge to the front side. Moreover, the holding portion 3c
While holding the inner peripheral portion 4a of the booster piston 4,
The front surface of the folded-back portion 3c 5 is formed so as to be flush with the front surface of the engaging collar portion 4a 2 , and the folded-back portion 3c 5
Together with the front surface of the engaging collar portion 4a 2 and the piston boss 5
The locking step portion 5c is abutted from the rear side.
【００１９】またピストンボス５には、ダイヤフラム３
の抱持部３ｃに後方側から当接するストッパ２９が係合
される。該ストッパ２９は、内周縁に菊座を有して金属
板により形成されるワッシャ３０と、そのワッシャ３０
の一部を覆ってモールド成形される硬質合成樹脂製の被
覆部材３１とから成る。ワッシャ３０は、円形平板状に
形成されているワッシャ本体３０ａの内周に、菊座を形
成すべく周方向に間隔をあけた複数の爪部３０ｂが設け
られて成るものであり、各爪部３０ｂは後方側（図２の
右方側）に向かうにつれて半径方向内方に傾斜して形成
される。また被覆部材３１は、前記ワッシャ３０におけ
るワッシャ本体３０ａの内周寄りの部分を露出させるよ
うにして該ワッシャ本体３０ａを覆うようにモールド形
成される。このようなストッパ２９において、被覆部材
３１は、ダイヤフラム３の抱持部３ｃにおける小円筒部
３ｃ3 の外面および鍔部３ｃ4 の背面に密着するように
形成される。また前記各爪部３０ｂの先端は、ピストン
ボス５における筒部５ｂの外周に設けられる環状の係合
溝３２に前方側から係止される。それによりストッパ２
９は、ダイヤフラム３の抱持部３ｃを係止段部５ｃに向
けて付勢する弾発力を発揮する。Further, the piston boss 5 has a diaphragm 3
A stopper 29 that comes into contact with the holding portion 3c from the rear side is engaged. The stopper 29 includes a washer 30 having a chrysanthemum seat on the inner peripheral edge and formed of a metal plate, and the washer 30.
And a covering member 31 made of a hard synthetic resin that is molded to cover a part of the. The washer 30 is formed by providing a plurality of claw portions 30b, which are circumferentially spaced to form a chrysanthemum, on the inner circumference of a washer body 30a formed in a circular flat plate shape. 30b is formed so as to be inclined inward in the radial direction toward the rear side (right side in FIG. 2). The covering member 31 is molded so as to cover the washer body 30a by exposing a portion of the washer 30 near the inner circumference of the washer body 30a. In such a stopper 29, the covering member 31 is formed so as to be in close contact with the outer surface of the small cylindrical portion 3c 3 and the rear surface of the collar portion 3c 4 in the holding portion 3c of the diaphragm 3. The tip of each of the claw portions 30b is locked from the front side in an annular engagement groove 32 provided on the outer circumference of the cylinder portion 5b of the piston boss 5. Thereby stopper 2
9 exerts an elastic force that urges the holding portion 3c of the diaphragm 3 toward the locking step portion 5c.
【００２０】ところで、ダイヤフラム３の抱持部３ｃ
は、ブースタピストン４の内周部４ａを抱持していない
自由状態では、図３で示す形状を有するものである。す
なわち抱持部３ｃにおいて、小円筒部３ｃ3 は、後方側
（図３の右方側）に向かうにつれてわずかに小径となる
形状であり、鍔部３ｃ4 は前記後方側に向かうにつれて
小径となるテーパ状であり、折り返し部３ｃ5 は横断面
形状を略Ｌ字状として鍔部３ｃ4 の内端に連設されてい
る。而してダイヤフラム３の型成形後の型抜き時には、
小円筒部３ｃ3 および鍔部３ｃ4 の連設点Ｐを支点とし
て型から抜く方向に鍔部３ｃ4 および折り返し部３ｃ5
を撓ませることにより、型抜きが可能となる。By the way, the holding portion 3c of the diaphragm 3
Has a shape shown in FIG. 3 in a free state in which the inner peripheral portion 4a of the booster piston 4 is not held. That the holding portion 3c, the small cylindrical portion 3c 3 is only a small diameter shape toward the rear side (right side in FIG. 3), the diameter reduced flange portion 3c 4 is directed to the rear side It has a taper shape, and the folded-back portion 3c 5 has a transverse cross-section of a substantially L-shape and is provided continuously with the inner end of the collar portion 3c 4 . Thus, at the time of die cutting after the diaphragm 3 is molded,
The collar portion 3c 4 and the folded portion 3c 5 are formed in the direction of pulling out from the mold with the continuous point P of the small cylindrical portion 3c 3 and the collar portion 3c 4 as a fulcrum.
By bending the die, it becomes possible to perform die cutting.
【００２１】このような形状の抱持部３ｃでブースタピ
ストン４の内周部４ａを抱持すると、抱持部３ｃの小円
筒部３ｃ3 、鍔部３ｃ4 および折り返し部３ｃ5 は、ブ
ースタピストン４の内周部４ａにおける小円筒部４
ａ3 、鍔部４ａ4 および折り返し部４ａ5 の形状に合わ
せて撓み、ピストンボス５の係止段部５ｃに弾発的に係
合していない自由な状態で、図２で示すように、大円筒
部４ａ1 の内周面および係合鍔部４ａ2 の前面を露出さ
せながらブースタピストン４の内周部４ａを弾発的に抱
持するようになり、折り返し部３ｃ5 はブースタピスト
ン４の内周部４ａにおける鍔部４ａ4 の前面に弾発的に
密接されることになる。[0021] embraces the inner circumferential portion 4a of the booster piston 4 by the holding portion 3c of this shape, the small cylindrical portion 3c 3 of holding portions 3c, flange portions 3c 4 and folded portions 3c 5 is the booster piston Small cylindrical portion 4 in the inner peripheral portion 4a of 4
a 3 , the collar portion 4a 4 and the folded portion 4a 5 are bent in conformity with the shape and are not elastically engaged with the locking step portion 5c of the piston boss 5, as shown in FIG. The inner peripheral portion 4a of the booster piston 4 is elastically held while exposing the inner peripheral surface of the large cylindrical portion 4a 1 and the front surface of the engaging collar portion 4a 2 , and the folded-back portion 3c 5 serves as the booster piston 4a. It will be elastically brought into close contact with the front surface of the collar portion 4a 4 in the inner peripheral portion 4a.
【００２２】次にこの実施例の作用について説明する
と、ブレーキペダル１２の操作に応じた入力杆１３の前
進作動に応じて制御弁１５は作動室ＲB を大気導入口７
に連通せしめ、それにより作動室ＲB に大気圧が作用
し、負圧室ＲA および作動室ＲB間に生じる大きな気圧
差によりブースタピストン４が前進作動し、出力杆２２
を介してマスタシリンダＭの作動ピストン２３を倍力作
動させることができる。また入力杆１２を、それに作用
させていた操作力の解放により後退作動させると、制御
弁１５により作動室ＲB は大気導入口７との連通を遮断
されるとともに負圧室ＲA に連通されるので、作動室Ｒ
B および負圧室ＲA 間の気圧差が減少し、戻しばね２５
の力でブースタピストン４が後退作動する。The operation of this embodiment will now be described. The control valve 15 moves the working chamber R B from the atmosphere introducing port 7 in response to the forward movement of the input rod 13 in response to the operation of the brake pedal 12.
Allowed communicating with, thereby the atmospheric pressure acts on the working chamber R B, booster piston 4 moves forward actuated by a large pressure difference occurs between the negative pressure chamber R A and working chamber R B, the output rod 22
The actuating piston 23 of the master cylinder M can be boosted via the. When the input rod 12 is moved backward by releasing the operating force acting on it, the control valve 15 blocks the working chamber R B from communicating with the atmosphere introduction port 7 and also communicates with the negative pressure chamber R A. Operating chamber R
The pressure difference between B and the negative pressure chamber R A decreases, and the return spring 25
The booster piston 4 is retracted by the force of.
【００２３】かかる負圧ブースタＢにおいて、ダイヤフ
ラム３の抱持部３ｃは、ピストンボス５に弾発的に係合
していない自由状態で、ブースタピストン４の内周部４
ａを弾発的に抱持するものであり、ブースタピストン４
およびダイヤフラム３の内周をピストンボス５に組付け
る際に、ダイヤフラム３の内周からブースタピストン４
の内周が外れることはなく、組付け性を向上することが
できる。しかも抱持部３ｃにおいて、折り返し部３ｃ5
は、ブースタピストン４の内周部４ａにおける鍔部４ａ
4 の前面に弾発的に密接されるものであり、皺を生じる
ことなく係止段部５ｃに当接、係合され、負圧室ＲA お
よび作動室ＲB 間のシール性の向上を図ることができ
る。In the negative pressure booster B, the holding portion 3c of the diaphragm 3 is in the free state in which it is not elastically engaged with the piston boss 5, and the inner peripheral portion 4 of the booster piston 4 is in a free state.
a for holding the a elastically, and the booster piston 4
When assembling the inner circumference of the diaphragm 3 to the piston boss 5, the booster piston 4 is moved from the inner circumference of the diaphragm 3 to the piston boss 5.
It is possible to improve the assembling property without the inner circumference of the sheet coming off. Moreover, in the holding portion 3c, the folded-back portion 3c 5
Is a collar portion 4a in the inner peripheral portion 4a of the booster piston 4.
4 is elastically brought into close contact with the front surface of 4 and is brought into contact with and engaged with the locking step portion 5c without causing wrinkles to improve the sealing property between the negative pressure chamber R A and the working chamber R B. Can be planned.
【００２４】上記実施例では、ブースタピストン４の内
周部４ａにおける小円筒部４ａ3 と鍔部４ａ4 とが直角
に連設されるようにしたが、直角でなくてもよく、ピス
トンボス５との係合を解除した自由状態でブースタピス
トン４の内周部４ａが抱持部３ｃに弾発的に抱持されれ
ばよい。In the above embodiment, the small cylinder portion 4a 3 and the collar portion 4a 4 in the inner peripheral portion 4a of the booster piston 4 are connected to each other at a right angle. The inner peripheral portion 4a of the booster piston 4 may be elastically held by the holding portion 3c in a free state in which the engagement with and is released.
【００２５】また本考案は、上記実施例のように単一の
ダイヤフラム３の両側に負圧室ＲAおよび作動室ＲB が
形成された負圧ブースタだけでけなく、負圧室および作
動室を一対ずつ備えるタンデム型負圧ブースタについて
も適用可能である。Further, the present invention is not limited to the negative pressure booster in which the negative pressure chamber R A and the working chamber R B are formed on both sides of the single diaphragm 3 as in the above-described embodiment, but also the negative pressure chamber and the working chamber. It is also applicable to a tandem type negative pressure booster having a pair of.
【００２６】[0026]
【考案の効果】以上のように本考案によれば、抱持部
は、ピストンボスとの係合を解除した自由状態でブース
タピストンの内周部を弾発的に抱持する形状に形成され
るので、ブースタピストンの内周部を抱持部で確実に保
持して組付け性を向上することができるとともに、ブー
スタピストンの内周部を抱持した状態で抱持部に皺が生
じることを防止してシール性を向上することができる。As described above, according to the present invention, the holding portion is formed in a shape that elastically holds the inner peripheral portion of the booster piston in the free state where the engagement with the piston boss is released. Therefore, it is possible to securely hold the inner peripheral portion of the booster piston by the holding portion to improve the assembling property, and wrinkles may be generated in the holding portion while holding the inner peripheral portion of the booster piston. Can be prevented and the sealing property can be improved.
【図１】本考案の一実施例の負圧ブースタの縦断面図で
ある。FIG. 1 is a vertical sectional view of a negative pressure booster according to an embodiment of the present invention.
【図２】図１の２部拡大図である。FIG. 2 is an enlarged view of part 2 of FIG.
【図３】ダイヤフラムの抱持部の自由状態での断面図で
ある。FIG. 3 is a sectional view of a holding portion of a diaphragm in a free state.
【図４】従来のダイヤフラムの抱持部の自由状態での断
面図である。FIG. 4 is a cross-sectional view of a holding portion of a conventional diaphragm in a free state.
１ ブースタシェル ３ ダイヤフラム ３ａ ダイヤフラムの外周部 ３ｃ ダイヤフラムの抱持部 ４ ブースタピストン ４ａ ブースタピストンの内周部 ５ ピストンボス Ｂ 負圧ブースタ 1 Booster Shell 3 Diaphragm 3a Diaphragm Outer Part 3c Diaphragm Holding Part 4 Booster Piston 4a Booster Piston Inner Part 5 Piston Boss B Negative Pressure Booster
Claims (1)
在に収容されるブースタピストン（４）の背面に、外周
部（３ａ）をブースタシェル（１）に結着させるダイヤ
フラム（３）が重合され、ブースタシェル（１）で前後
往復動自在に支承されたピストンボス（５）の背面に
は、ダイヤフラム（３）の内周に設けられる抱持部（３
ｃ）がブースタピストン（４）の内周部（４ａ）を抱持
した状態で弾発的に係合される負圧ブースタにおいて、
抱持部（３ｃ）は、ピストンボス（５）との係合を解除
した自由状態でブースタピストン（４）の内周部（４
ａ）を弾発的に抱持する形状に形成されることを特徴と
する負圧ブースタ。1. A diaphragm (3) for binding an outer peripheral portion (3a) to the booster shell (1) is superposed on the rear surface of a booster piston (4) housed in the booster shell (1) so as to be able to reciprocate back and forth. On the back surface of the piston boss (5) supported by the booster shell (1) so as to be able to reciprocate back and forth, a holding portion (3) provided on the inner circumference of the diaphragm (3) is provided.
c) In the negative pressure booster that is elastically engaged with the inner peripheral portion (4a) of the booster piston (4) being held,
The holding portion (3c) is an inner peripheral portion (4) of the booster piston (4) in a free state where the engagement with the piston boss (5) is released.
A negative pressure booster, which is formed in a shape to elastically embrace a).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991049859U JPH0734771Y2 (en) | 1991-06-28 | 1991-06-28 | Negative pressure booster |
| KR2019910018664U KR960001970Y1 (en) | 1991-06-28 | 1991-11-06 | Vacuum brake booster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991049859U JPH0734771Y2 (en) | 1991-06-28 | 1991-06-28 | Negative pressure booster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0586741U JPH0586741U (en) | 1993-11-22 |
| JPH0734771Y2 true JPH0734771Y2 (en) | 1995-08-09 |
Family
ID=12842782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991049859U Expired - Lifetime JPH0734771Y2 (en) | 1991-06-28 | 1991-06-28 | Negative pressure booster |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0734771Y2 (en) |
| KR (1) | KR960001970Y1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19925092C2 (en) * | 1999-06-01 | 2003-04-10 | Contitech Luftfedersyst Gmbh | Bellows air suspension |
-
1991
- 1991-06-28 JP JP1991049859U patent/JPH0734771Y2/en not_active Expired - Lifetime
- 1991-11-06 KR KR2019910018664U patent/KR960001970Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0586741U (en) | 1993-11-22 |
| KR930000666U (en) | 1993-01-20 |
| KR960001970Y1 (en) | 1996-03-06 |
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