JPH0958456A - Diaphram attachment structure of negative pressure booster for vehicle - Google Patents
Diaphram attachment structure of negative pressure booster for vehicleInfo
- Publication number
- JPH0958456A JPH0958456A JP7214774A JP21477495A JPH0958456A JP H0958456 A JPH0958456 A JP H0958456A JP 7214774 A JP7214774 A JP 7214774A JP 21477495 A JP21477495 A JP 21477495A JP H0958456 A JPH0958456 A JP H0958456A
- Authority
- JP
- Japan
- Prior art keywords
- diameter annular
- valve body
- stopper
- annular groove
- negative pressure
- 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.)
- Pending
Links
Landscapes
- Braking Systems And Boosters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ブレーキペダルや
ブレーキレバー操作による入力トルクを負圧を利用して
増大し、四輪自動車や自動二輪車を始めとする車両のブ
レーキを作動する負圧ブースタに係り、詳しくは、ブー
スタシェルの内部を負圧室と作動室に仕切るダイヤフラ
ムの取付け構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative pressure booster for increasing the input torque by operating a brake pedal or a brake lever by using a negative pressure to operate a brake of a vehicle such as a four-wheeled vehicle or a motorcycle. More specifically, the present invention relates to a diaphragm mounting structure that partitions the interior of the booster shell into a negative pressure chamber and a working chamber.
【０００２】[0002]
【従来の技術】四輪自動車等のブレーキに用いられる負
圧ブースタとして、例えば実公平６−１１８４１号公報
に示されるものがある。この技術は、ブースタシェルの
中心軸上に配設されるバルブボディの外周面に、大径環
状溝と小径環状溝とを連設し、ブースタシェルの内部を
負圧室と作動室とに仕切るダイヤフラムの内周側ビード
を、大径環状溝に締まり嵌めを以て気密に嵌着すると共
に、前記小径環状溝にリング状のストッパを嵌着して、
ダイヤフラムがブースタピストンの中心軸方向へ往復動
した際に、小径環状溝のストッパで、ダイヤフラムの内
周側ビードが大径環状溝から外れて気密性が損われるこ
とがないようにしている。2. Description of the Related Art As a negative pressure booster used for a brake of a four-wheeled vehicle or the like, for example, there is one disclosed in Japanese Utility Model Publication No. 6-11841. In this technique, a large-diameter annular groove and a small-diameter annular groove are continuously provided on the outer peripheral surface of a valve body arranged on the central axis of the booster shell, and the interior of the booster shell is partitioned into a negative pressure chamber and a working chamber. The inner peripheral bead of the diaphragm is hermetically fitted into the large-diameter annular groove with an interference fit, and a ring-shaped stopper is fitted to the small-diameter annular groove.
When the diaphragm reciprocates in the central axis direction of the booster piston, the stopper of the small-diameter annular groove prevents the inner peripheral side bead of the diaphragm from coming off the large-diameter annular groove and impairing the airtightness.
【０００３】ストッパの内周縁には、複数の弾性爪が内
周側ビードと反対側へ傾斜して突設されており、ストッ
パをバルブボディへ手作業や機械による自動的な押し込
み手段によって組付けする際には、バルブボディの外周
面に弾性爪を弾性変形させながら滑らせて小径環状溝方
向への圧入を許容し、ストッパが小径環状溝へ位置する
と、弾性変形を解かれた弾性爪が小径環状溝に落ち込ん
で、ストッパの嵌合状態を保持するようになっている。On the inner peripheral edge of the stopper, a plurality of elastic claws are provided so as to incline toward the side opposite to the inner peripheral bead, and the stopper is assembled to the valve body by manual work or automatic pushing means by a machine. When elastically deforming the elastic claws on the outer peripheral surface of the valve body, allow them to be pressed into the small-diameter annular groove by elastically deforming them. It is designed to fall into a small-diameter annular groove and hold the stopper in a fitted state.
【０００４】[0004]
【発明が解決しようとする課題】このような構成にあっ
ては、ストッパの組付け時に、バルブボディの外周面に
弾性爪の鋭利な先端を抵抗を以て摺接させるために、あ
るストッパは低い押し込み荷重で圧入できるが、他のス
トッパには高い押し込み荷重が必要となるなど、個々の
ストッパによって押し込み荷重にバラ付きを生じ、組付
け作業を困難にすることがあった。In such a structure, when the stopper is assembled, a certain stopper has a low pushing force in order to cause the sharp tip of the elastic claw to slidably contact the outer peripheral surface of the valve body with resistance. Although it can be press-fitted with a load, a high pushing load is required for other stoppers, and the pushing load varies depending on the individual stoppers, which may make assembly work difficult.
【０００５】本発明は、このような実情に鑑みてなされ
たもので、その目的とするところは、ストッパをバルブ
ボディへ圧入で組付けする際に、ストッパに対する挿入
荷重のバラ付きを極力抑えて、組付け性の向上を図った
車両用負圧ブースタのダイヤフラム取付け構造を提供す
ることにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress variations in the insertion load with respect to the stopper as much as possible when the stopper is press-fitted into the valve body. The purpose of the present invention is to provide a diaphragm mounting structure for a negative pressure booster for a vehicle, which has an improved assembling property.
【０００６】[0006]
【課題を解決するための手段】上述の目的に従って本発
明は、ブースタシェルの中心軸上を入力杆の押動にて移
動するバルブボディの外周面に、大径環状溝と小径環状
溝とを連設し、前記ブースタシェルの内部を負圧室と作
動室とに仕切るダイヤフラムの内周側ビードを前記大径
環状溝に嵌着すると共に、前記小径環状溝に、内周縁か
ら内周側ビードと反対側へ傾斜して突出する複数の弾性
爪を備えるリング状のストッパを圧入によって嵌着する
車両用負圧ブースタのダイヤフラム取付け構造におい
て、前記複数の弾性爪に、前記内周側ビードと反対方向
へ前記バルブボディの外周面と平行乃至は外側へ傾斜し
て延びる係止片を設け、該係止片を前記小径環状溝に嵌
合したことを特徴としている。According to the present invention, a large-diameter annular groove and a small-diameter annular groove are provided on the outer peripheral surface of a valve body which moves on the central axis of a booster shell by pushing of an input rod. The inner peripheral side bead of the diaphragm that connects the booster shell and divides the inside of the booster shell into a negative pressure chamber and a working chamber is fitted into the large diameter annular groove, and the small diameter annular groove is fitted to the inner peripheral side bead. In a diaphragm mounting structure of a negative pressure booster for a vehicle, in which a ring-shaped stopper having a plurality of elastic claws inclined and protruding to the opposite side is press-fitted, the plurality of elastic claws are opposite to the inner peripheral side bead. A locking piece extending in a direction parallel to the outer peripheral surface of the valve body or inclined outward is provided, and the locking piece is fitted in the small-diameter annular groove.
【０００７】[0007]
【発明の実施の形態】以下、本発明の一形態例を図面に
基づいて説明する。負圧ブースタ１のケーシングとなる
ブースタシェル２は、前後一対のシェル半体２ａ，２ｂ
を接合して構成され、後部シェル半体２ｂを、車室３と
エンジン室４とを仕切る車体の隔壁５にボルト６及びナ
ット７で固定して、エンジン室４の内部に車体前後方向
へ向けて配設される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The booster shell 2 serving as the casing of the negative pressure booster 1 includes a pair of front and rear shell halves 2a and 2b.
The rear shell half body 2b is fixed to the partition wall 5 of the vehicle body that separates the vehicle compartment 3 and the engine compartment 4 with bolts 6 and nuts 7, and is directed inside the engine compartment 4 in the vehicle front-rear direction. Is arranged.
【０００８】ブースタシェル２の前部中央には、負圧ブ
ースタ１の倍力作動にて内部のブレーキ液を昇圧する液
圧マスタシリンダ８が、ボルト９及びナット１０を用い
て取付けられている。ブースタシェル２の後部中央には
円筒状のバルブハウジング２ｃが突設され、その内部
に、後端をブレーキペダル１１に連結される入力杆１２
の先端側が、端壁２ｄに開口する大気導入口２ｅより突
出配置されている。At the center of the front portion of the booster shell 2, a hydraulic master cylinder 8 for boosting the internal brake fluid by boosting operation of the negative pressure booster 1 is attached using bolts 9 and nuts 10. A cylindrical valve housing 2c is provided at the center of the rear portion of the booster shell 2, and an input rod 12 having a rear end connected to the brake pedal 11 is provided therein.
The tip end side of is projected and arranged from the atmosphere introduction port 2e opening to the end wall 2d.
【０００９】ブースタシェル２の内部は、薄鋼板製のブ
ースタピストン１３と、該ピストン１３の背面に接合さ
れる可撓性のダイヤフラム１４とによって、車体前部側
の負圧室１５と車体後部側の作動室１６とに仕切られて
おり、ブースタシェル２とバルブハウジング２ｃの中心
軸上に、前記入力杆１２の押動にて車体前後方向へ移動
する合成樹脂製のバルブボディ１７が配設されている。
ダイヤフラム１４は、外周側ビード１４ａがシェル半体
２ａ，２ｂの接合部に挾着され、内周側ビード１４ｂ
が、ブースタピストン１３の内周縁１３ａと共に、バル
ブボディ１７のテーパ状の本体部１７ａにリング状のス
トッパ１８を用いて取付けされている。Inside the booster shell 2, a booster piston 13 made of a thin steel plate and a flexible diaphragm 14 joined to the rear surface of the piston 13 are used to form a negative pressure chamber 15 on the front side of the vehicle body and a rear side of the vehicle body. And a valve body 17 made of synthetic resin, which is moved in the longitudinal direction of the vehicle body by the pushing of the input rod 12, is arranged on the central axis of the booster shell 2 and the valve housing 2c. ing.
The outer peripheral bead 14a of the diaphragm 14 is sandwiched between the shell half bodies 2a and 2b, and the inner peripheral bead 14b of the diaphragm 14 is attached.
Is attached to the tapered main body 17a of the valve body 17 together with the inner peripheral edge 13a of the booster piston 13 by using a ring-shaped stopper 18.
【００１０】ブースタピストン１３とバルブボディ１７
は、ブースタシェル２の前部壁と、バルブボディ１７の
前面で出力杆１９の基部１９ａを抜け止め係止するリテ
ーナ２０との間に縮設された第１バルブスプリング２１
によって常時車体後部方向へ付勢され、ブースタピスト
ン１３の後退限が、ダイヤフラム１４の突起１４ｃとブ
ースタシェル２の後部壁との当接によって規制されると
共に、バルブボディ１７の後退限が、筒状部１７ｂの後
端に嵌着したフィルタ２２，２３とバルブハウジング２
ｃの端壁２ｄとの当接によって規制されるようになって
いる。Booster piston 13 and valve body 17
Is a first valve spring 21 compressed between a front wall of the booster shell 2 and a retainer 20 that locks the base 19a of the output rod 19 on the front surface of the valve body 17 so as not to come off.
Is constantly urged toward the rear of the vehicle body, the rearward limit of the booster piston 13 is restricted by the abutment of the projection 14c of the diaphragm 14 and the rear wall of the booster shell 2, and the rearward limit of the valve body 17 is cylindrical. The filters 22 and 23 fitted to the rear end of the portion 17b and the valve housing 2
It is designed to be regulated by the contact with the end wall 2d of c.
【００１１】バルブボディ１７は、筒状部１７ｂの外周
を、前記バルブハウジング２ｃに係止プレート２４にて
係止されるリングホルダ２５とシール材２６にて保持さ
れており、その内部に、前記入力杆１２の先端側と制御
弁２７とが配設されている。制御弁２７は、バルブボデ
ィ１７に周設された第１弁座２８と、該第１弁座２８に
着座するゴム製の弁体２９と、弁体２９の内周に形成さ
れた第２弁座３０と、該第２弁座３０に着座する弁ピス
トン３１とを持っている。The valve body 17 is held at its outer periphery by a ring holder 25 and a seal member 26, which are locked to the valve housing 2c by a locking plate 24, and the inside of the cylindrical body 17b. A front end side of the input rod 12 and a control valve 27 are arranged. The control valve 27 includes a first valve seat 28 provided around the valve body 17, a rubber valve body 29 seated on the first valve seat 28, and a second valve formed on the inner periphery of the valve body 29. It has a seat 30 and a valve piston 31 seated on the second valve seat 30.
【００１２】上記弁体２９は、バルブボディ１７の筒状
部１７ｂに嵌着された保持筒３２の前端に保持され、ま
た弁ピストン３１は、バルブボディ１７に後部側へ開口
して設けた段付き孔１７ｃ内に保持されており、弁ピス
トン３１に凹設された受け穴３１ａには、入力杆１２の
球状頭部１２ａが首振り可能に支承されている。The valve body 29 is held at the front end of a holding cylinder 32 fitted in the cylindrical portion 17b of the valve body 17, and the valve piston 31 is a step provided in the valve body 17 by opening to the rear side. The spherical head portion 12a of the input rod 12 is supported in a receiving hole 31a formed in the valve piston 31 so as to be swingable.
【００１３】入力杆１２と弁体２９との間には、テーパ
状の第２バルブスプリング３３が、また入力杆１２と保
持筒３２との間には、同じくテーパ状の第３バルブスプ
リング３４がそれぞれ縮設されており、第２バルブスプ
リング３３によって、弁体２９が第１弁座２８に着座す
るよう付勢されると共に、第３バルブスプリング３４に
よって、入力杆１２がブレーキペダル方向へ付勢されて
いる。入力杆１２にはストッパ３５とロックナット３６
とが螺着されており、ストッパ３５を移動することによ
って、入力杆１２の後退限を調整できるようにしてい
る。A second tapered valve spring 33 is provided between the input rod 12 and the valve element 29, and a third tapered valve spring 34 is similarly provided between the input rod 12 and the holding cylinder 32. Each of them is compressed, and the second valve spring 33 urges the valve element 29 to be seated on the first valve seat 28, and the third valve spring 34 urges the input rod 12 toward the brake pedal. Has been done. The input rod 12 has a stopper 35 and a lock nut 36.
And are screwed together, and the rear end of the input rod 12 can be adjusted by moving the stopper 35.
【００１４】バルブボディ１７には、第１ポート３７と
第２ポート３８とが設けられており、前記負圧室１５と
第１弁座２８の外側とが第１ポート３７にて連通し、作
動室１６と弁ピストン３１の外周とが第２ポート３８を
通して連通すると共に、弁体２９及び保持筒３２の内部
と大気導入口２ｅとがフィルタ２２，２３を通して連通
している。負圧室１５は、図示しないエンジンのインテ
ークマニホールド等の負圧源に接続されており、負圧室
１５と作動室１６は、弁体２９と弁ピストン３１とが第
１及び第２弁座２８，３０から離間した際に、大気導入
口２ｅとが連通するようになっている。The valve body 17 is provided with a first port 37 and a second port 38, and the negative pressure chamber 15 and the outside of the first valve seat 28 communicate with each other through the first port 37 to operate. The chamber 16 and the outer periphery of the valve piston 31 communicate with each other through the second port 38, and the insides of the valve body 29 and the holding cylinder 32 communicate with the atmosphere introduction port 2e through the filters 22 and 23. The negative pressure chamber 15 is connected to a negative pressure source such as an intake manifold of an engine (not shown), and the negative pressure chamber 15 and the working chamber 16 have a valve body 29 and a valve piston 31 which are the first and second valve seats 28. , 30 to communicate with the atmosphere introduction port 2e.
【００１５】バルブボディ１７の負圧室側には、弾性ピ
ストン３９と前記出力杆１９の基部１９ａとがリテーナ
２０にて係着されており、出力杆１９の先端は、前記液
圧マスタシリンダ８から負圧室１５へ突出するピストン
４０の後端を支承するように設けられる。On the negative pressure chamber side of the valve body 17, an elastic piston 39 and a base portion 19a of the output rod 19 are attached by a retainer 20, and the tip of the output rod 19 is at the hydraulic master cylinder 8 side. Is provided so as to support the rear end of the piston 40 protruding from the negative pressure chamber 15.
【００１６】バルブボディ１７は、本体部１７ａの外周
面１７ｄに大径環状溝１７ｅと小径環状溝１７ｆとが連
設されている。大径環状溝１７ｅは、比較的大きな円弧
で側壁に連続しており、また小径環状溝１７ｆは、大径
環状溝１７ｅへ続くテーパ面を持っている。大径環状溝
１７ｅには、ダイヤフラム１４の内周側ビード１４ｂが
適度な締まり嵌めを以て気密に嵌着され、また小径環状
溝１７ｆにはリング状のストッパ１８が嵌着されてい
る。In the valve body 17, a large-diameter annular groove 17e and a small-diameter annular groove 17f are continuously provided on the outer peripheral surface 17d of the main body 17a. The large-diameter annular groove 17e is continuous with the side wall in a relatively large arc, and the small-diameter annular groove 17f has a tapered surface continuing to the large-diameter annular groove 17e. The inner peripheral side bead 14b of the diaphragm 14 is airtightly fitted in the large-diameter annular groove 17e with an appropriate interference fit, and the ring-shaped stopper 18 is fitted in the small-diameter annular groove 17f.
【００１７】ストッパ１８の外周縁には、内周側ビード
１４ｂと反対側へ突出するリム１８ａが周設され、また
ストッパ１８の内周縁には、内周側ビード１４ｂと反対
側へ傾斜して突出する複数の弾性爪１８ｂが等間隔で設
けられている。各弾性爪１８ｂの先端には、内周側ビー
ド１４ｂと反対方向へバルブボディ１７の外周面と平行
に延びる係止片１８ｃが設けられており、ストッパ１８
はバルブボディ１７の本体部１７ａの外周面１７ｄより
も大径に形成され、また複数の係止片１８ｃによって描
かれる仮想円Ｒは、小径環状溝１７ｆと同径に設定され
ている。A rim 18a is provided around the outer peripheral edge of the stopper 18 so as to project to the side opposite to the inner peripheral bead 14b, and the inner peripheral edge of the stopper 18 is inclined toward the side opposite to the inner peripheral bead 14b. A plurality of protruding elastic claws 18b are provided at equal intervals. A stopper piece 18c is provided at the tip of each elastic claw 18b and extends parallel to the outer peripheral surface of the valve body 17 in a direction opposite to the inner peripheral bead 14b.
Is formed to have a larger diameter than the outer peripheral surface 17d of the main body 17a of the valve body 17, and the virtual circle R drawn by the plurality of locking pieces 18c is set to have the same diameter as the small-diameter annular groove 17f.
【００１８】上記ストッパ１８は、弾性爪１８ｂと係止
片１８ｃとを内周側ビード１４ｂと反対側に向けなが
ら、手作業或いは機械による適宜な押し込み手段を用い
てバルブボディ１７の筒状部１７ｂ側から外挿され、本
体部１７ａでは、弾性爪１８ｂと係止片１８ｃとの稜縁
１８ｄを外周面１７ｄに摺接させて、弾性爪１８ｂと係
止片１８ｃを外側へ弾性変形しながら、小径環状溝方向
へ圧入されて行く。そして、ストッパ１８が小径環状溝
１７ｆの外側に位置すると、稜縁１８ｄと外周面１７ｄ
との摺接が外れ、弾性変形を解かれた弾性爪１８ｂと係
止片１８ｃの復元力によって、係止片１８ｃが小径環状
溝１７ｆに落ち込む。これにより、係止片１８ｃの先端
が小径環状溝１７ｆの側壁１７ｇと対向して、ストッパ
１８自身の嵌合状態が保持され、またダイヤフラム１４
の内周側ビード１４ｂが、ストッパ１８によって大径環
状溝１７ｅ内に保持される。The stopper 18 has a cylindrical portion 17b of the valve body 17 which is manually or mechanically pushed in while the elastic claw 18b and the locking piece 18c are directed toward the opposite side of the inner bead 14b. It is externally inserted from the side, and in the main body portion 17a, the ridge edges 18d of the elastic claws 18b and the locking pieces 18c are brought into sliding contact with the outer peripheral surface 17d to elastically deform the elastic claws 18b and the locking pieces 18c to the outside. It is pressed into the small-diameter annular groove. Then, when the stopper 18 is located outside the small-diameter annular groove 17f, the ridge 18d and the outer peripheral surface 17d.
Sliding contact with and the elastic claws 18b and elastic pieces 18c that have been elastically deformed and the restoring force of the engaging pieces 18c cause the engaging pieces 18c to fall into the small-diameter annular groove 17f. As a result, the tip of the locking piece 18c faces the side wall 17g of the small-diameter annular groove 17f, and the fitted state of the stopper 18 itself is maintained, and the diaphragm 14
The inner peripheral side bead 14b is held in the large-diameter annular groove 17e by the stopper 18.
【００１９】上述のように構成される本形態例の負圧ブ
ースタ１は、図２に示す非作動時に制御弁２７が閉状態
にあって、負圧室１５と作動室１６及び大気導入口２ｅ
との連通が遮断されている。そして、ブレーキペダル１
１を踏み操作して、入力杆１２が車体前部方向へ前進す
ると、球形頭部１２ａに押動される弁ピストン３１が前
進して第２弁座３０から離間し、大気導入口２ｅから第
２弁座３０及びポート３８を通して、外部の大気が作動
室１６へ導入される。大気が導入された作動室１６は負
圧室１５よりも高圧となり、ブースタピストン１３は、
これらの圧力差によって、第１バルブスプリング２１に
抗しながら前進し、出力杆１９を介して液圧マスタシリ
ンダ８のピストン４０を倍力で押動する。In the negative pressure booster 1 of the present embodiment configured as described above, the control valve 27 is in the closed state at the time of non-operation shown in FIG. 2, the negative pressure chamber 15, the working chamber 16 and the atmosphere introduction port 2e.
Communication with is interrupted. And the brake pedal 1
When 1 is depressed and the input rod 12 moves forward in the front direction of the vehicle body, the valve piston 31 pushed by the spherical head portion 12a moves forward and separates from the second valve seat 30, and the air introducing port 2e External atmosphere is introduced into the working chamber 16 through the two-valve seat 30 and the port 38. The working chamber 16 into which the atmosphere is introduced has a higher pressure than the negative pressure chamber 15, and the booster piston 13 is
Due to these pressure differences, it moves forward against the first valve spring 21, and pushes the piston 40 of the hydraulic master cylinder 8 via the output rod 19 with a boosting force.
【００２０】また、ブレーキペダル１１の踏み操作を解
除すると、弁ピストン３１が入力杆１９と共に後退し、
弁ピストン３１が第２弁座３０に着座すると共に、弁体
２９を後退方向に押動して、第１弁座２８から離間させ
る。これにより、作動室１６と負圧室１５とが第１及び
第２ポート３７，３８を介して連通し、作動室１６と負
圧室１５との圧力差がなくなって、ブースタピストン１
３が、第１バルブスプリング２１の弾発力にて後退し、
液圧マスタシリンダ７の押動が解除される。When the depression operation of the brake pedal 11 is released, the valve piston 31 moves backward together with the input rod 19,
The valve piston 31 is seated on the second valve seat 30, and the valve body 29 is pushed in the backward direction to separate it from the first valve seat 28. As a result, the working chamber 16 and the negative pressure chamber 15 communicate with each other through the first and second ports 37 and 38, and the pressure difference between the working chamber 16 and the negative pressure chamber 15 disappears, and the booster piston 1
3 is retracted by the elastic force of the first valve spring 21,
The pushing motion of the hydraulic master cylinder 7 is released.
【００２１】本形態例は、ストッパ１８の弾性爪１８ｂ
に、内周側ビード１４ｂと反対方向へバルブボディ１７
の外周面と平行な係止片１８ｃを延設したから、ストッ
パ１８を本体部１７ａへ圧入する際には、本体部１７ａ
の外周面１７ｄに弾性爪１８ｂと係止片１８ｃとを折り
曲げた稜縁１８ｄが滑らかに摺接するので、バルブボデ
ィ１７の外周面１７ｄに弾性爪の鋭い先端を摺接させて
いた従来のものと比較すると、弾性爪１８ｂの傾斜角が
滑り抵抗によってバラ付くことが極力防止され、全ての
係止片１８ｃが小径環状溝１７ｆへ確実で容易に落ち込
ませることができると共に、負圧ブースタ１毎に設定さ
れるストッパ１８を、一定の押し込み荷重で圧入できる
ようになるので、組付け作業性の向上を図ることができ
る。また、バルブボディ１７を軽量な合成樹脂で形成し
た場合にも、外周面１７ｄをストッパの圧入で削って、
バリや削り粉を発生させることもない。In this embodiment, the elastic claw 18b of the stopper 18 is used.
The valve body 17 in the direction opposite to the inner bead 14b.
Since the locking piece 18c extending parallel to the outer peripheral surface of the main body 17a is inserted into the main body 17a when the stopper 18 is press-fitted into the main body 17a.
Since the ridge edge 18d obtained by bending the elastic claw 18b and the locking piece 18c is smoothly slidably contacting the outer peripheral surface 17d of the above, the sharp tip of the elastic claw is slidably contacted to the outer peripheral surface 17d of the valve body 17. By comparison, it is possible to prevent the inclination angle of the elastic claw 18b from varying due to the sliding resistance as much as possible, and all the locking pieces 18c can be surely and easily dropped into the small-diameter annular groove 17f, and each negative pressure booster 1 Since the set stopper 18 can be press-fitted with a constant pushing load, the assembling workability can be improved. Even when the valve body 17 is made of lightweight synthetic resin, the outer peripheral surface 17d is cut by press fitting the stopper,
No burr or shavings are generated.
【００２２】尚、上述の形態例では、弾性爪と係止片と
の稜縁に円弧面を形成すると、バルブボディ外周面との
滑り抵抗を減少できて、上述の効果を一層高めることが
できる。また、弾性爪と係止片の長さや角度によって
は、係止片の内面全体がバルブボディの外周面を摺接す
るようになるが、この場合にも上述の形態例と同様の効
果を奏する。更に本発明は、係止片をバルブボディの外
周面から外側へ傾斜するように設けてもよく、係止片の
先端を小さくカールさせてもよい。In the embodiment described above, when the arcuate surface is formed on the ridge between the elastic claw and the locking piece, the sliding resistance with the outer peripheral surface of the valve body can be reduced, and the above-mentioned effect can be further enhanced. . Further, depending on the length and angle of the elastic claw and the locking piece, the entire inner surface of the locking piece comes into sliding contact with the outer peripheral surface of the valve body, but in this case also, the same effect as the above-described embodiment can be obtained. Further, in the present invention, the locking piece may be provided so as to be inclined outward from the outer peripheral surface of the valve body, and the tip of the locking piece may be curled small.
【００２３】[0023]
【発明の効果】本発明は、大径環状溝に嵌合したダイヤ
フラムの内周側ビードを抜け止めするリング状のストッ
パに、複数の弾性爪から内周側ビードと反対方向へバル
ブボディの外周面と平行乃至は外側へ傾斜する係止片を
延設して、該係止片をバルブボディ外周面の小径環状溝
に嵌合する構造としたから、ストッパを小径環状溝へ圧
入する際には、バルブボディの外周面に、係止爪の内面
や弾性爪と係止片との稜縁が滑らかに摺接するようにな
る。従って、弾性爪の鋭い先端を摺接させていた従来の
ものと比較すると、弾性爪の傾斜角が滑り抵抗によって
バラ付くことが極力防止され、全ての係止片が小径環状
溝へ確実で容易に落ち込ませることができると共に、負
圧ブースタ毎に設定されるストッパを、一定の押し込み
荷重で圧入できるようになるので、組付け作業性の向上
を図ることができる。また、バルブボディに軽量な合成
樹脂を採用した場合にも、外周面をストッパの圧入で削
って、バリや削り粉を発生させることもない。As described above, according to the present invention, the ring-shaped stopper for preventing the inner peripheral side bead of the diaphragm fitted in the large-diameter annular groove from coming off is provided with a plurality of elastic claws in the direction opposite to the inner peripheral side bead and the outer periphery of the valve body. Since a locking piece extending parallel to the surface or inclined to the outside is extended and the locking piece is fitted in the small-diameter annular groove on the outer peripheral surface of the valve body, when the stopper is press-fitted into the small-diameter annular groove. Allows the inner surface of the locking claw and the ridges of the elastic claw and the locking piece to slide smoothly on the outer peripheral surface of the valve body. Therefore, compared with the conventional one in which the sharp tip of the elastic claw is in sliding contact, it is possible to prevent the inclination angle of the elastic claw from varying due to sliding resistance as much as possible, and all locking pieces can be reliably and easily placed in the small-diameter annular groove. Since the stopper set for each negative pressure booster can be press-fitted with a constant pushing load, the assembling workability can be improved. Even when a lightweight synthetic resin is used for the valve body, the outer peripheral surface is not pressed by a stopper to generate burrs or shavings.
【図１】本発明の一形態例を示す負圧ブースタの要部拡
大断面図FIG. 1 is an enlarged cross-sectional view of a main part of a negative pressure booster showing an embodiment of the present invention.
【図２】本発明の一形態例を示す負圧ブースタの断面正
面図FIG. 2 is a sectional front view of a negative pressure booster showing an embodiment of the present invention.
【図３】本発明の一形態例を示すストッパの斜視図FIG. 3 is a perspective view of a stopper showing an embodiment of the present invention.
１…負圧ブースタ ２…ブースタシェル ２ｃ…バルブハウジング ２ｅ…大気導入口 ８…液圧マスタシリンダ １１…ブレーキペダル １２…入力杆 １３…ブースタピストン １３ａ…ブースタピストン１３の内周縁 １４…ダイヤフラム １４ａ…ダイヤフラム１４の外周側ビード １４ｂ…ダイヤフラム１４の内周側ビード １５…負圧室 １６…作動室 １７…合成樹脂製のバルブボディ １７ａ…バルブボディ１７の本体部 １７ｂ…バルブボディ１７の筒状部 １７ｄ…本体部１７ａの外周面 １７ｅ…外周面１７ｄに形成された大径環状溝 １７ｆ…外周面１７ｄに形成された小径環状溝 １７ｇ…小径環状溝１７ｆの側壁１７ｇ １８…リング状のストッパ １９…出力杆 ２７…制御弁 ２９…弁体 ３１…弁ピストン ３２…保持筒 １８ａ…ストッパ１８のリム １８ｂ…ストッパ１８の弾性爪 １８ｃ…弾性爪１８ｂに続く係止片 １８ｄ…弾性爪１８ｂと係止片１８ｃとの稜縁 Ｒ…複数の係止片１８ｃで描かれる小径環状溝１７ｃと
同径の仮想円1 ... Negative pressure booster 2 ... Booster shell 2c ... Valve housing 2e ... Atmosphere introduction port 8 ... Hydraulic master cylinder 11 ... Brake pedal 12 ... Input rod 13 ... Booster piston 13a ... Booster piston 13 inner peripheral edge 14 ... Diaphragm 14a ... Diaphragm Outer peripheral bead 14b of diaphragm 14 Inner peripheral bead of diaphragm 14 Negative pressure chamber 16 Working chamber 17 Synthetic resin valve body 17a ... Main body portion 17b of valve body 17 ... Cylindrical portion 17d of valve body 17 Outer peripheral surface 17e of main body portion 17a ... Large diameter annular groove 17f formed on outer peripheral surface 17d ... Small diameter annular groove 17g formed on outer peripheral surface 17d ... Side wall 17g of small diameter annular groove 17f 18 ... Ring-shaped stopper 19 ... Output rod 27 ... Control valve 29 ... Valve body 31 ... Valve piston 32 ... Holding cylinder 18a ... Stopper 1 Rim 18b ... Elastic claw 18c of stopper 18 ... Locking piece 18d following elastic claw 18b ... Ridge edge between elastic claw 18b and locking piece R ... Same as small-diameter annular groove 17c drawn by a plurality of locking pieces 18c Virtual circle of diameter
Claims (1)
動にて移動するバルブボディの外周面に、大径環状溝と
小径環状溝とを連設し、前記ブースタシェルの内部を負
圧室と作動室とに仕切るダイヤフラムの内周側ビードを
前記大径環状溝に嵌着すると共に、前記小径環状溝に、
内周縁から内周側ビードと反対側へ傾斜して突出する複
数の弾性爪を備えるリング状のストッパを圧入で嵌着す
る車両用負圧ブースタのダイヤフラム取付け構造におい
て、前記複数の弾性爪に、前記内周側ビードと反対方向
へ前記バルブボディの外周面と平行乃至は外側へ傾斜し
て延びる係止片を設け、該係止片を前記小径環状溝に嵌
合したことを特徴とする車両用負圧ブースタのダイヤフ
ラム取付け構造。1. A large-diameter annular groove and a small-diameter annular groove are continuously provided on an outer peripheral surface of a valve body that moves on the central axis of the booster shell by pushing of an input rod, and a negative pressure is applied to the inside of the booster shell. While fitting the inner peripheral side bead of the diaphragm partitioning the chamber and the working chamber into the large-diameter annular groove, in the small-diameter annular groove,
In a diaphragm mounting structure of a vehicle negative pressure booster in which a ring-shaped stopper equipped with a plurality of elastic claws protruding obliquely from the inner peripheral edge to the side opposite to the inner peripheral side bead is fitted, in the plurality of elastic claws, A vehicle characterized in that a locking piece extending in a direction opposite to the inner peripheral side bead and extending in parallel to the outer peripheral surface of the valve body or outward is provided, and the locking piece is fitted in the small-diameter annular groove. Negative pressure booster diaphragm mounting structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7214774A JPH0958456A (en) | 1995-08-23 | 1995-08-23 | Diaphram attachment structure of negative pressure booster for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7214774A JPH0958456A (en) | 1995-08-23 | 1995-08-23 | Diaphram attachment structure of negative pressure booster for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0958456A true JPH0958456A (en) | 1997-03-04 |
Family
ID=16661319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7214774A Pending JPH0958456A (en) | 1995-08-23 | 1995-08-23 | Diaphram attachment structure of negative pressure booster for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0958456A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017132271A (en) * | 2016-01-25 | 2017-08-03 | 株式会社アドヴィックス | Negative pressure type booster |
-
1995
- 1995-08-23 JP JP7214774A patent/JPH0958456A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017132271A (en) * | 2016-01-25 | 2017-08-03 | 株式会社アドヴィックス | Negative pressure type booster |
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