JPH0215737B2 - - Google Patents
Info
- Publication number
- JPH0215737B2 JPH0215737B2 JP57057347A JP5734782A JPH0215737B2 JP H0215737 B2 JPH0215737 B2 JP H0215737B2 JP 57057347 A JP57057347 A JP 57057347A JP 5734782 A JP5734782 A JP 5734782A JP H0215737 B2 JPH0215737 B2 JP H0215737B2
- Authority
- JP
- Japan
- Prior art keywords
- adjustment
- brake
- shoe
- lever
- adjustment lever
- 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
- 238000003825 pressing Methods 0.000 claims description 6
- 210000000078 claw Anatomy 0.000 description 7
- 238000005452 bending Methods 0.000 description 4
- 230000005489 elastic deformation Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
- F16D65/561—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake
- F16D65/563—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake arranged adjacent to service brake actuator, e.g. on parking brake lever, and not subjected to service brake force
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Description
【発明の詳細な説明】
本発明はシユー間隙自動調整装置を内蔵するド
ラムブレーキに関し、ドラムとブレーキシユーと
の間隙の過調整を防止するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum brake incorporating an automatic shoe gap adjustment device, which prevents excessive adjustment of the gap between the drum and the brake shoe.
バツクプレート上に可動的に装架された一対の
ブレーキシユーの一方の対向端が作動装置に、且
つ他方の対向端がアンカー部材に夫々当接し、ラ
イニングの摩耗に対応するブレーキシユーの過大
な拡開量に応答して、一方のブレーキシユーに枢
支した調整レバーがばね手段により回転すると共
に、該調整レバーに一端が係合されたブレーキシ
ユーの戻りを規制するストラツトが連動してその
実質的な有効長を伸長し、以てドラムとブレーキ
シユーとの間隙を常にほぼ一定に維持するシユー
間隙自動調整装置が種々提供されている。しかし
乍ら、従来のこの種の装置に於いては、ドラムや
ブレーキシユー等の弾性変形に係わらず、ブレー
キシユーの拡開量に追従して前記調整レバーを回
転してしまう。従つて、急制動時の過調整を防止
するためには、通常制動時のドラムとブレーキシ
ユーとの間隙を大きく設定する必要があり、その
結果、通常制動時のペダル或いはハンドレバーの
操作フイーリングが悪くなつたり、突発時の制動
距離が長くなつて事故を誘発し易い等の欠点があ
つた。 One opposing end of a pair of brake shoes movably mounted on the back plate is in contact with the actuating device, and the other opposing end is in contact with the anchor member. In response to the amount of expansion, an adjustment lever pivotally supported on one brake shoe is rotated by a spring means, and a strut that restricts the return of the brake shoe, one end of which is engaged with the adjustment lever, is interlocked. Various automatic shoe gap adjustment devices have been provided which extend the substantial effective length of the brake shoe and thereby maintain a substantially constant gap between the drum and the brake shoe. However, in this type of conventional device, the adjustment lever is rotated in accordance with the amount of expansion of the brake shoe, regardless of the elastic deformation of the drum, brake shoe, etc. Therefore, in order to prevent over-adjustment during sudden braking, it is necessary to set a large gap between the drum and the brake shoe during normal braking, and as a result, the operation feeling of the pedal or hand lever during normal braking will be There were disadvantages such as poor performance and longer braking distance in the event of a sudden collision, which could easily lead to an accident.
本発明は上述した欠点を解消するために、調整
レバーから一体に伸長した伸長部をブレーキシユ
ー作動装置の作動子とブレーキシユーとの間に介
挿したものであつて、前記作動装置の作動力が上
昇してライニングがドラムに接触し始めると、調
整レバーの伸長部が急激に強く圧接されてその回
転が停止するものである。即ち、調整レバーの回
転はドラムやブレーキシユー等の弾性変形に追従
しないのでドラムとブレーキシユーとの間隙を小
さく設定出来る。 In order to solve the above-mentioned drawbacks, the present invention is such that an extension part extending integrally from the adjustment lever is inserted between the actuator of the brake shoe actuating device and the brake shoe. When the operating force increases and the lining begins to come into contact with the drum, the extension of the adjustment lever is suddenly and strongly pressed against it, stopping its rotation. That is, since the rotation of the adjustment lever does not follow the elastic deformation of the drum, brake shoe, etc., the gap between the drum and the brake shoe can be set small.
以下、本発明を図面に示す実施例により詳細に
説明する。第１図はその一実施例であつて、１は
バツクプレート、２，３はバツクプレート１上に
可動的に装架された断面Ｔ字状の一対のブレーキ
シユーであつて、夫々シユーリム２ａ，３ａ、シ
ユーウエーブ２ｂ，３ｂ及びライニング２ｃ，３
ｃとから成つている。４はシユー２，３の上方対
向端間に介在されたブレーキシユー作動装置であ
るホイールシリンダ、４ａ，４ｂは該シリンダ４
の両側に滑動自在に嵌装された一対の対向するブ
レーキシユー作動子であるピストン、５はシユー
２，３の下方対向端間に介在しバツクプレート１
上に固定されたアンカー部材、６はブレーキレバ
ーで、その一方端がシユー３の上方端近傍にピン
７で以て回動自在に軸支され、他方端には図示し
ない機械的作動装置のコントロールケーブルが連
結される。ブレーキレバー６の中間部とシユー２
間にはドラム（図示せず）とライニング２ｃ，３
ｃとの間隙を調整する機能を備えたストラツト８
が懸け渡され、且つブレーキレバー６の背縁に形
成した突出部６ａがシユーリム３ａに当接して常
時のシユー２，３の外径が決められる。前記スト
ラツト８はねじ棒９、調整ナツト１０及び管部材
１１より構成されており、ねじ棒９はその一方の
フオーク部９ａがブレーキレバー６に係合し、他
方のねじ部９ｂは調整ナツト１０を螺合し、その
突出部が管部材１１の中空部に遊嵌している。管
部材１１の一方のフオーク部１１ａはシユーウエ
ブ２ｂの切欠溝２ｄに係合し、他方の中空部開口
端面が調整ナツト１０の一側面に当接している。
１２はシユー２の上方端近傍にピン１３で以て回
動可能に軸支された調整レバーであつて、ピン１
３の軸方向並びに径方向に所望の間隙を有して遊
嵌している。調整レバー１２の一方の腕１２ａは
調整ナツト１０に向かつて延設され、そしてほぼ
直角に折曲された先端部の駆動歯１２ｂが、調整
ナツト１０の外周に形成した小核みな調整歯１０
ａに係合している。又、調整レバー１２の他方の
腕１２ｃは管部材１１のフオーク部１１ａの外方
に向かつて延設され、その内縁１２ｄがフオーク
部１１ａの外方端面に当接している。更に、前記
他方の腕１２ｃの外縁にはバツクプレート１側に
向かう折曲部１２ｅが形成され、その折曲部１２
ｅとシユー２間に張設した調整ばね１４により常
時ストラツト８をブレーキレバー６に当接せしめ
ると共に、調整レバー１２の駆動歯１２ｂを調整
ナツト１０の調整歯１０ａに係合せしめる如く偏
倚力を与えている。１５ａ，１５ｂはブレーキ不
作動時、両ブレーキシユー２，３を相近よる方向
に付勢するシユー戻しばね、１６ａ，１６ｂはブ
レーキシユー２，３をバツクプレート１上に軽く
押し付けているホールド機構である。 Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings. FIG. 1 shows one embodiment of the same, in which reference numeral 1 denotes a back plate, and 2 and 3 a pair of brake shoes having a T-shaped cross section movably mounted on the back plate 1, each of which has a rear rim 2a. , 3a, Sheuwave 2b, 3b and lining 2c, 3
It consists of c. 4 is a wheel cylinder which is a brake shoe actuating device interposed between upper opposing ends of shoes 2 and 3; 4a and 4b are cylinders 4;
A pair of opposing brake shoe operating elements, pistons 5, are slidably fitted on both sides of the back plate 1 and are interposed between lower opposing ends of the shoes 2 and 3.
The anchor member 6 fixed on the top is a brake lever, one end of which is rotatably supported by a pin 7 near the upper end of the shoe 3, and the other end controls a mechanical actuator (not shown). Cables are connected. The middle part of the brake lever 6 and the brake lever 2
There is a drum (not shown) and linings 2c and 3 in between.
Strut 8 with a function to adjust the gap between c.
is suspended, and the protruding portion 6a formed on the back edge of the brake lever 6 comes into contact with the shoe rim 3a, thereby determining the outer diameter of the shoes 2 and 3 at all times. The strut 8 is composed of a threaded rod 9, an adjusting nut 10, and a pipe member 11. One fork portion 9a of the threaded rod 9 engages with the brake lever 6, and the other threaded portion 9b engages with the adjusting nut 10. They are screwed together, and the protruding portion loosely fits into the hollow portion of the tube member 11. One fork portion 11a of the tube member 11 is engaged with a notch groove 2d of the shew web 2b, and the other hollow opening end surface is in contact with one side of the adjustment nut 10.
Reference numeral 12 denotes an adjustment lever rotatably supported by a pin 13 near the upper end of the shoe 2;
3 with a desired gap in the axial and radial directions. One arm 12a of the adjustment lever 12 is extended toward the adjustment nut 10, and the drive tooth 12b at the tip bent at an almost right angle is a small-shaped adjustment tooth 10 formed on the outer periphery of the adjustment nut 10.
It is engaged with a. The other arm 12c of the adjustment lever 12 extends outward from the fork portion 11a of the tube member 11, and its inner edge 12d is in contact with the outer end surface of the fork portion 11a. Further, a bent portion 12e directed toward the back plate 1 is formed on the outer edge of the other arm 12c.
The adjustment spring 14 stretched between the shaft e and the shoe 2 constantly brings the strut 8 into contact with the brake lever 6, and applies a biasing force so that the drive tooth 12b of the adjustment lever 12 engages with the adjustment tooth 10a of the adjustment nut 10. ing. 15a and 15b are shoe return springs that urge both brake shoes 2 and 3 toward each other when the brakes are not activated, and 16a and 16b are hold mechanisms that lightly press the brake shoes 2 and 3 onto the back plate 1. It is.
上述した構成が従来のドラムブレーキの実施例
であつて、本発明によるものは調整レバー１２に
そのピストン４ａ側から伸長する伸長部１２ｆを
一体に形成し、その伸長部１２ｆの端部をほぼ直
角に折曲した折曲部１２ｇと成し、該折曲部１２
ｇをシユーウエブ２ｂとピストン４ａとの間に介
挿せしめたものである。前記折曲部１２ｇはピン
１３を支点とする弧状に、且つシユーウエブ２ｂ
の端面を前記折曲部１２ｇより若干小さい曲率半
径で形成すると良い。 The above-mentioned configuration is an embodiment of a conventional drum brake, and the one according to the present invention has an extension part 12f extending from the piston 4a side formed integrally with the adjustment lever 12, and the end of the extension part 12f is set at a substantially right angle. The bent portion 12g is formed by bending the bent portion 12g.
g is inserted between the shew web 2b and the piston 4a. The bent portion 12g has an arc shape with the pin 13 as the fulcrum, and
It is preferable to form the end face with a slightly smaller radius of curvature than the bent portion 12g.
上述した構成に於けるシユー間隙自動調整の作
動を説明する。 The operation of automatic shoe gap adjustment in the above configuration will be explained.
ホイールシリンダ４に液圧が生ずるとピストン
４ａ，４bbがシユー戻しばね１５ａ，１５ｂに
抗してブレーキシユー２，３を拡開し、回転して
いるドラム（図示せず）にライニング２ｃ，３ｃ
を圧接してこれを制動する。この時、調整レバー
１２には調整ばね１４により予め回転力が付与さ
れているため、ストラツト８をブレーキシユー３
の動きに追従させると共に、図に於いてピン１３
を支点として反時計方向に回転する。今、ライニ
ング２ｃ，３ｃが摩耗してブレーキシユー２，３
の拡開量が所定の量より大きい場合には駆動歯１
２ｂが調整ナツト１０を回転せしめてねじ棒９を
管部材１１より引き出し、ストラツト８の全長を
増大してドラムとライニング２ｃ，３ｃとの間隙
を詰める。然して従来の調整作動時には、調整レ
バー１２の回転量がドラムやブレーキシユー２，
３等の弾性変形分をも含んでいたので液圧による
ので液圧による前記間隙の大きな変動を余儀なく
された。本発明によるものはライニング２ｃ，３
ｃがドラムに接触し始めると、調整レバー１２の
折曲部１２ｇがピストン４ａとシユーウエブ２ｂ
により急激に強く圧接されてその回転が停止さ
れ、自動調整が不作動状態になる。即ち、調整レ
バー１２はブレーキシユー２とほぼ一体となつて
動くのみである。従つて、それ以降の液圧上昇に
よるドラムやブレーキシユー２，３等の弾性変形
を吸収せず、液圧による前記間隙の変動を小さく
することが出来るものである。 When hydraulic pressure is generated in the wheel cylinder 4, the pistons 4a, 4bb expand the brake shoes 2, 3 against the shoe return springs 15a, 15b, and the linings 2c, 3c are applied to the rotating drum (not shown).
Brake this by applying pressure. At this time, since the adjusting lever 12 has been given a rotational force by the adjusting spring 14 in advance, the strut 8 is moved from the brake shoe 3.
In addition to following the movement of pin 13 in the figure,
Rotate counterclockwise using the fulcrum. Now, the linings 2c and 3c are worn out and the brake shoes 2 and 3
If the amount of expansion is larger than the predetermined amount, the drive tooth 1
2b rotates the adjusting nut 10 to pull out the threaded rod 9 from the tube member 11, increasing the overall length of the strut 8 and closing the gap between the drum and the linings 2c, 3c. However, during the conventional adjustment operation, the amount of rotation of the adjustment lever 12 depends on the drum, brake shoe 2,
Since it also included elastic deformation of the order of 3, the gap was forced to undergo large fluctuations due to the hydraulic pressure. According to the present invention, the linings 2c, 3
c begins to contact the drum, the bent portion 12g of the adjustment lever 12 moves between the piston 4a and the shew web 2b.
The rotation is stopped due to sudden strong pressure contact, and the automatic adjustment becomes inactive. That is, the adjustment lever 12 only moves almost integrally with the brake shoe 2. Therefore, the elastic deformation of the drum, brake shoes 2, 3, etc. due to subsequent increase in hydraulic pressure is not absorbed, and fluctuations in the gap due to hydraulic pressure can be reduced.
第２図は本発明による変形例を示す第１図の
−断面図であつて、シユーウエブ２ｂとピスト
ン４ａとの間に介挿した調整レバー１２の伸長部
１２ｆの折曲部１２ｇに角度θを設けたものであ
る。先ず、前記折曲部１２ｇを図の方向に傾けた
場合の自動調整の作動を説明する。ホイールシリ
ンダ４に液圧が生じてライニング２ｃ，３ｃがド
ラムに接触するまでは、調整ばね１４により調整
レバー１２の駆動歯１２ｂが調整ナツト１０の調
整歯１０ａに正常に係合した状態で調整作動をし
続けるが、ライニング２ｃ，３ｃがドラムに接触
し始めてホイールシリンダ４の押付力が調整ばね
１４の偏倚力に打ち勝つて折曲部１２ｇの角度θ
が減少する。そのため、調整レバー１２の駆動歯
１２ｂ側がバツクプレート１側に傾動し、以て駆
動歯１２ｂと調整歯１０ａの係合が外れて自動調
整が停止するものである。次いで、前記折曲部１
２ｇを図の反対方向に傾けた場合の自動調整の作
動を説明する。ホイールシリンダ４に液圧が生じ
てライニング２ｃ，３ｃがドラムに接触するまで
は駆動歯１２ｂの調整歯１０ａへの押付力が正常
状態にあるので調整ばね１４により調整作動をし
続けるが、ライニング２ｃ，３ｃがドラムに接触
し始めると、調整レバー１２の一方の腕１２ａが
撓んで駆動歯１２ｂの調整歯１０ａへの押付力が
急激に増大し、該係合部分の摩擦力が大きくなる
のでストラツト８及び調整レバー１２等はブレー
キシユー２とほぼ一体となつて動くのみであり、
自動調整が停止する。 FIG. 2 is a cross-sectional view of FIG. 1 showing a modification according to the present invention, in which an angle θ is set at the bent portion 12g of the extension portion 12f of the adjustment lever 12 inserted between the shew web 2b and the piston 4a. It was established. First, the automatic adjustment operation when the bending portion 12g is tilted in the direction shown in the figure will be explained. Until hydraulic pressure is generated in the wheel cylinder 4 and the linings 2c and 3c come into contact with the drum, the adjusting spring 14 allows the adjusting operation to occur with the driving tooth 12b of the adjusting lever 12 normally engaged with the adjusting tooth 10a of the adjusting nut 10. However, when the linings 2c and 3c begin to contact the drum, the pressing force of the wheel cylinder 4 overcomes the biasing force of the adjustment spring 14, and the angle θ of the bent portion 12g is changed.
decreases. Therefore, the driving tooth 12b side of the adjusting lever 12 tilts toward the back plate 1, and the driving tooth 12b and the adjusting tooth 10a are disengaged from each other and automatic adjustment is stopped. Next, the bending part 1
The automatic adjustment operation when the 2g is tilted in the opposite direction as shown in the figure will be explained. Until hydraulic pressure is generated in the wheel cylinder 4 and the linings 2c and 3c come into contact with the drum, the pressing force of the drive tooth 12b against the adjustment tooth 10a is in a normal state, so the adjustment operation is continued by the adjustment spring 14, but the lining 2c , 3c starts to come into contact with the drum, one arm 12a of the adjustment lever 12 is bent, and the pressing force of the drive tooth 12b against the adjustment tooth 10a increases rapidly, and the frictional force of the engaging portion increases, so that the strut 8 and the adjustment lever 12, etc., only move almost integrally with the brake shoe 2,
Automatic adjustment stops.
第３図はシユー戻しばね１５ａを利用して調整
レバー１２に回転力を付与した従来のシユー間隙
自動調整装置に本発明を用いたものであつて、シ
ユーウエブ２ｂにピン１３で以て軸支した調整レ
バー１２の一方の腕１２ａは、シユー戻しばね１
５ａを跨いで調整ナツト１０に向かつて延設さ
れ、その折曲された先端部の駆動歯１２ｂが調整
ナツト１０の調整歯１０ａに係合している。調整
レバー１２の他方の腕１２ｃは管部材１１のフオ
ーク部１１ａに向かつて延設されて、そのシユー
ウエブ２ｂ面と略平行な部分が前記フオーク部１
１ａの溝に遊嵌されると共に、外縁にほぼ直角に
折曲した折曲部１２ｅを形成し、その内面がフオ
ーク部１１ａ外縁に当接される。又、前述した実
施例と同様の本発明による伸長部１２ｆが調整レ
バー１２より延設され、その端部の折曲した折曲
部１２ｇがシユーウエブ２ｂとピストン４ａ間に
介挿される。シユー戻しばね１５ａの一方のフツ
クは調整レバー１２の枢支点と他方の腕１２ｃの
フオーク部１１ａへの当接点との中間部に、且つ
他方のフツクがシユーウエブ３ｂに夫々掛止され
てブレーキシユー２，３を相近よる方向に付勢す
ると共に、図に於いて調整レバー１２を反時計方
向に付勢している。本構成によるブレーキ作動及
びシユー間隙自動調整作動は上述した実施例とほ
ぼ同じにつき説明を省略する。 FIG. 3 shows a conventional shoe gap automatic adjustment device in which the present invention is applied to a conventional shoe gap automatic adjustment device that uses a shoe return spring 15a to apply rotational force to the adjustment lever 12, and is pivoted on a shoe web 2b with a pin 13. One arm 12a of the adjustment lever 12 is connected to the shoe return spring 1.
5a and extends toward the adjustment nut 10, and the drive tooth 12b at the bent tip engages with the adjustment tooth 10a of the adjustment nut 10. The other arm 12c of the adjustment lever 12 is extended toward the fork portion 11a of the tube member 11, and a portion thereof substantially parallel to the surface of the shew web 2b is connected to the fork portion 1.
A bent portion 12e is loosely fitted into the groove of the fork portion 1a, and a bent portion 12e is bent at a substantially right angle to the outer edge, and the inner surface of the bent portion 12e is brought into contact with the outer edge of the fork portion 11a. Further, an extension part 12f according to the present invention similar to the embodiment described above extends from the adjustment lever 12, and a bent part 12g at the end thereof is inserted between the shew web 2b and the piston 4a. One hook of the shoe return spring 15a is hooked to the intermediate portion between the pivot point of the adjustment lever 12 and the contact point of the other arm 12c to the fork portion 11a, and the other hook is hooked to the shoe web 3b, so that the brake shoe can be 2 and 3 toward each other, and also urges the adjustment lever 12 counterclockwise in the figure. The brake operation and automatic shoe gap adjustment operation according to this configuration are almost the same as those of the above-mentioned embodiment, and therefore their explanation will be omitted.
第４図は上述したインクリメンタル形自動調整
装置とは異なるワンシヨツト形自動調整装置に本
発明を用いた実施例であつて、１０１はバツクプ
レート、１０２，１０３は一対の対向するブレー
キシユー、１０２ａ，１０３ａはシユーリム、１
０２ｂ，１０３ｂはシユーウエブ、１０２ｃ，１
０３ｃはライニング、１０４はホイールシリン
ダ、１０４ａ，１０４ｂはそのピストンである。
１０５はアンカー部材、１０６はブレーキバーで
その一端がピン１０７で以てシユーウエブ１０３
ｂに回動可能に軸支され、他端の背縁に形成した
突出部１０６ａがシユーリム１０３ａの内面に当
接している。１０８は板状のストラツトで、その
一方のフオーク部１０８ａにブレーキレバー１０
６の中間部とシユーウエブ１０３ｂを嵌入し、フ
オーク部１０８ａの溝底にブレーキレバー１０６
の切欠き溝１０６ｂの底が当接している。ストラ
ツト１０８の他方にもフオーク状をしたフオーク
部１０８ｂを有してシユーウエブ１０２ｂと後述
する調整レバー１１２を嵌入している。板状の調
整レバー１１２はシユーウエブ１０２ｂの上方端
近傍にピン１１３で以で回動可能に軸支され、図
の下方に向かつて延設された延設端部１１２ａの
弧状の外縁には小刻みな調整歯１１２ｂが刻設さ
れている。調整レバー１１２の中間部には略矩形
の穴１１２ｃが穿設され、この穴１１２ｃにスト
ラツト１０８のフオーク部１０８ｂの溝に形成し
た突状鉤部１０８ｃが嵌入され、ブレーキ非作動
時には、前記突状鉤部１０８ｃの左端面１０８ｄ
が矩形穴１１２ｃの左内縁に当接してブレーキシ
ユー１０２の戻りを規制し、右端面１０８ｅと矩
形穴１１２ｃの右内縁とに間隙Δxを有している。
１１０は一端がシユーウエブ１０２ｂにピン１１
３で以て回動可能に軸支された爪部材で、他端の
外縁に刻設した歯１１０ａが前記調整レバー１１
２の調整歯１１２ｂに噛み合い、該爪部材１１０
はピン１１３に取着した捩りばね１１７により、
図に於いて、常時反時計方向に付勢されている。
捩りばね１１７はそのコイル部をピン１１３に嵌
装して、その一方の腕１１７ａをシユーリム１０
２ａの内面に当接し、且つ他方の腕１１７ｂを撓
ませた状態で爪部材１１０の外縁に掛止すること
により爪部材１１０に回転力を与えている。１１
４はシユーウエブ１０３ｂとストラツト１０８間
に張設した調整ばねで、ブレーキ作動時、捩りば
ね１１７に抗してストラツト１０８と調整レバー
１１２とをブレーキシユー１０３の動きに追従さ
せる。１１５ａ，１１５ｂはシユー戻しばね、１
１６ａ，１１６ｂはシユーホールド機構である。 FIG. 4 shows an embodiment in which the present invention is applied to a one-shot type automatic adjustment device different from the above-mentioned incremental type automatic adjustment device, in which 101 is a back plate, 102 and 103 are a pair of opposing brake shoes, 102a, 103a is Shurim, 1
02b, 103b are Sheuweb, 102c, 1
03c is a lining, 104 is a wheel cylinder, and 104a, 104b are pistons thereof.
105 is an anchor member, 106 is a brake bar, one end of which is connected to the show web 103 with a pin 107.
b, and a protrusion 106a formed on the back edge of the other end is in contact with the inner surface of the rim 103a. 108 is a plate-shaped strut, and the brake lever 10 is attached to one of the fork parts 108a.
6 and the show web 103b, and insert the brake lever 106 into the groove bottom of the fork part 108a.
The bottoms of the notched grooves 106b are in contact with each other. The other side of the strut 108 also has a fork-shaped fork portion 108b into which a shew web 102b and an adjustment lever 112, which will be described later, are fitted. The plate-shaped adjustment lever 112 is rotatably supported by a pin 113 near the upper end of the show web 102b, and the arcuate outer edge of the extending end 112a extending downward in the drawing is provided with small steps. Adjustment teeth 112b are carved. A substantially rectangular hole 112c is bored in the middle of the adjustment lever 112, and a protruding hook portion 108c formed in a groove of the fork portion 108b of the strut 108 is fitted into this hole 112c. Left end surface 108d of hook portion 108c
comes into contact with the left inner edge of the rectangular hole 112c to restrict the return of the brake shoe 102, and has a gap Δx between the right end surface 108e and the right inner edge of the rectangular hole 112c.
110 has one end attached to the shew web 102b with pin 11.
3, and teeth 110a carved on the outer edge of the other end engage the adjustment lever 11.
The claw member 110 meshes with the adjustment tooth 112b of No. 2
is caused by the torsion spring 117 attached to the pin 113,
In the figure, it is always biased counterclockwise.
The torsion spring 117 has its coil portion fitted onto the pin 113, and one arm 117a of the torsion spring 117 is attached to the spring 10.
A rotational force is applied to the claw member 110 by contacting the inner surface of the claw member 2a and hooking the other arm 117b to the outer edge of the claw member 110 with the other arm 117b being bent. 11
Reference numeral 4 denotes an adjustment spring stretched between the shoe web 103b and the strut 108, which causes the strut 108 and adjustment lever 112 to follow the movement of the brake shoe 103 against the torsion spring 117 when the brake is activated. 115a and 115b are show return springs, 1
16a and 116b are shoe-hold mechanisms.
上述した構成が従来のドラムブレーキの実施例
であつて、本発明によるものは調整レバー１１２
のピン１１３による支承部回りに溶接やリベツト
止め等の手段で以て当板１１８を固着し、該当板
１１８から伸張する伸長部１１８ｆの端部にはほ
ぼ直角に折曲された折曲部１１８ｇが形成されて
おり、この折曲部１１８ｇがシユーウエブ１０２
ｂとピストン１０４ａ間に介挿される。 The configuration described above is an example of a conventional drum brake, and the one according to the present invention has an adjustment lever 112.
A backing plate 118 is fixed around the supporting portion by the pin 113 by means such as welding or riveting, and the end of the extending portion 118f extending from the corresponding plate 118 has a bent portion 118g bent at an approximately right angle. is formed, and this bent portion 118g is the shew web 102.
b and the piston 104a.
上述した構成に於けるシユー間隙自動調整の作
動を説明する。ホイールシリンダ１０４に液圧が
生じるとピストン１０４ａ，１０４ｂがシユー戻
しばね１１５ａ，１１５ｂに抗してブレーキシユ
ー１０２，１０３を拡開し、回転しているドラム
（図示せず）にライニング１０２ｃ，１０３ｃを
圧接してこれを制動する。この時、ストラツト１
０８は調整ばね１１４によりブレーキシユー１０
３の動きに追従し、調整レバー１１２と爪部材１
１０等はブレーキシユー１０２とほぼ一体となつ
てその動きに追従する。今、ライニング１０２
ｃ，１０３ｃが摩耗してブレーキシユー１０２，
１０３の拡開量が所定の量より大きい場合には、
ストラツト１０８の突状鉤部１０８ｃの右端面１
０８ｅが調整レバー１１２の矩形穴１１２ｃの右
内縁に当接してその間隙Δxを吸収し、更に捩り
ばね１１７に抗して調整レバー１１２が、図に於
いて反時計方向に回転されるので、調整レバー１
１２と爪部材１１０の歯１１２ｂと１１０の噛み
合い位置が移動する。以てストラツト１０８の実
質的な有効長を伸長してドラムとライニング１０
２ｃ，１０３ｃとの間隙を詰める。従つて、本形
式のシユー間隙自動調整装置も前述したインクリ
メンタル形自動調整装置と同様の欠点を有してい
た。 The operation of automatic shoe gap adjustment in the above configuration will be explained. When hydraulic pressure is generated in the wheel cylinder 104, the pistons 104a, 104b expand the brake shoes 102, 103 against the shoe return springs 115a, 115b, and the linings 102c, 103c are applied to the rotating drum (not shown). Brake this by applying pressure. At this time, strut 1
08 is the brake shoe 10 by the adjustment spring 114.
Following the movement of 3, the adjustment lever 112 and the claw member 1
The brake shoe 102, etc., is almost integrated with the brake shoe 102 and follows its movement. Now, lining 102
c, 103c are worn out and the brake shoe 102,
If the expansion amount of 103 is larger than the predetermined amount,
Right end surface 1 of the protruding hook portion 108c of the strut 108
08e comes into contact with the right inner edge of the rectangular hole 112c of the adjustment lever 112 and absorbs the gap Δx, and the adjustment lever 112 is further rotated counterclockwise in the figure against the torsion spring 117, so that the adjustment is completed. Lever 1
12 and the tooth 112b of the claw member 110 and the meshing position of 110 move. This extends the substantial effective length of the struts 108 and connects the drum and lining 10.
Close the gap between 2c and 103c. Therefore, this type of automatic shoe gap adjustment device also had the same drawbacks as the above-mentioned incremental type automatic adjustment device.
本発明によれば、ライニング１０２ｃ，１０３
ｃがドラムに接触し始めると、調整レバー１１２
と一体の当板１１８の折曲部１１８ｇがピストン
１０４ａとシユーウエブ１０２ｂにより急激に強
く圧接されてその回転が停止される。調整レバー
１１２の回転が停止した後は、調整ばね１１４が
伸長されてストラツト１０８、調整レバー１１２
及び爪部材１１０等がブレーキシユー１０２とほ
ぼ一体となつて動くのみであつて、自動調整が停
止する。 According to the invention, the linings 102c, 103
c begins to contact the drum, the adjustment lever 112
The bent portion 118g of the contact plate 118, which is integral with the piston 104a and the shoot web 102b, is suddenly and strongly pressed against the piston 104a and the shew web 102b, and its rotation is stopped. After the adjustment lever 112 stops rotating, the adjustment spring 114 is extended and the strut 108 and adjustment lever 112 are extended.
The pawl member 110 and the like only move almost integrally with the brake shoe 102, and the automatic adjustment is stopped.
上述の説明から明らかな如く、本発明によれば
調整レバーから一体に伸長せしめた伸長部の端部
をシユーウエブとシユー作動子との間に介挿する
事により、ライニングがドラムに接触した以降の
シユー間隙自動調整を停止出来るため、制動状態
によるドラムとライニングとの間隙の変動が小さ
い。従つて、ペダル或いはハンドレバーストロー
クを小さく設定出来てフイーリングが良好になる
と共に、突発時等の制動距離が短かくなつて安全
である。又、従来の構成部品の変更も少なく、且
つ構造が簡単であるためそのレイアウトが容易で
あると共に、ブレーキの分解及び組立作業が極め
て簡単であり、しかも回転部分が少ないので耐久
性や耐環境性に対しても優れている等本発明は多
大の効果を有している。 As is clear from the above description, according to the present invention, by inserting the end of the extension part integrally extended from the adjustment lever between the show web and the show actuator, the adjustment after the lining contacts the drum is prevented. Since automatic shoe gap adjustment can be stopped, variations in the gap between the drum and lining due to braking conditions are small. Therefore, the pedal or hand lever stroke can be set small, resulting in good feeling, and the braking distance in the event of an accident is shortened, resulting in safety. In addition, there are few changes to conventional components and the structure is simple, making layout easy. Disassembling and assembling the brake is extremely easy, and since there are few rotating parts, it is durable and environmentally resistant. The present invention has many effects, such as being superior to both.
第１図は本発明の一実施例を示すドラムブレー
キの正面図、第２図はその変形例を示す第１図の
−断面図、第３図は他の実施例を示すドラム
ブレーキの要部の正面図、第４図は更に他の実施
例を示すドラムブレーキの正面図である。
２，３，１０２，１０３……ブレーキシユー、
４，１０４……ホイールシリンダ、４ａ，４ｂ，
１０４ａ，１０４ｂ……ピストン、８，１０８…
…ストラツト、９……ねじ棒、１０……調整ナツ
ト、１１……管部材、１２，１１２……調整レバ
ー、１２ｆ，１１８ｆ……伸長部、１２ｇ，１１
８ｇ……折曲部、１１０……爪部材、１１８……
当板。
FIG. 1 is a front view of a drum brake showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1 showing a modification thereof, and FIG. 3 is a main part of a drum brake showing another embodiment. FIG. 4 is a front view of a drum brake showing still another embodiment. 2, 3, 102, 103...Brake shoe,
4,104...Wheel cylinder, 4a, 4b,
104a, 104b... Piston, 8, 108...
... Strut, 9 ... Threaded rod, 10 ... Adjustment nut, 11 ... Pipe member, 12, 112 ... Adjustment lever, 12f, 118f ... Extension part, 12g, 11
8g...Bending portion, 110...Claw member, 118...
Our board.
Claims (1)
該ブレーキシユーの外径を規制するストラツトを
配し、一方のブレーキシユーに枢支されると共に
前記ストラツトの一端部に連動するように係合し
た調整レバーが、ブレーキシユーの過大な拡開に
応答して回転し、以て前記ストラツトの実質的な
有効長を伸長する自動調整装置に於いて、前記調
整レバーから一体に伸長せしめた伸長部を形成
し、該伸長端部をブレーキ作動装置の作動子とブ
レーキシユーとの間に介挿し、前記作動子の押圧
力が所定値に達すると前記調整レバーの回転を停
止させる構成としたことを特徴とするブレーキの
シユー間〓自動調整装置。1 At one opposite end of the pair of brake shoes,
A strut is arranged to regulate the outer diameter of the brake shoe, and an adjustment lever that is pivotally supported by one brake shoe and operatively engaged with one end of the strut prevents excessive expansion of the brake shoe. The automatic adjustment device rotates in response to opening and thereby extends a substantial effective length of the strut, forming an extension extending integrally from the adjustment lever, the extension end being brake actuated. Automatic adjustment between brake shoes, characterized in that the adjustment lever is inserted between an actuator of a device and a brake shoe, and stops rotation of the adjustment lever when the pressing force of the actuator reaches a predetermined value. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5734782A JPS58174735A (en) | 1982-04-08 | 1982-04-08 | Automatic shoe gap adjusting device for brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5734782A JPS58174735A (en) | 1982-04-08 | 1982-04-08 | Automatic shoe gap adjusting device for brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58174735A JPS58174735A (en) | 1983-10-13 |
| JPH0215737B2 true JPH0215737B2 (en) | 1990-04-13 |
Family
ID=13053034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5734782A Granted JPS58174735A (en) | 1982-04-08 | 1982-04-08 | Automatic shoe gap adjusting device for brake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58174735A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS628439U (en) * | 1985-06-29 | 1987-01-19 | ||
| JPH0214672Y2 (en) * | 1985-09-03 | 1990-04-20 | ||
| JP2000192998A (en) * | 1998-12-25 | 2000-07-11 | Nisshinbo Ind Inc | Shoe clearance automatic adjusting device of drum brake |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5817236A (en) * | 1981-06-03 | 1983-02-01 | ル−カス・インダストリ−ズ・パブリツク・リミテツド・カンパニ− | Automatic regulator for brake |
-
1982
- 1982-04-08 JP JP5734782A patent/JPS58174735A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5817236A (en) * | 1981-06-03 | 1983-02-01 | ル−カス・インダストリ−ズ・パブリツク・リミテツド・カンパニ− | Automatic regulator for brake |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58174735A (en) | 1983-10-13 |
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