JPS6326584Y2 - - Google Patents
Info
- Publication number
- JPS6326584Y2 JPS6326584Y2 JP1982145743U JP14574382U JPS6326584Y2 JP S6326584 Y2 JPS6326584 Y2 JP S6326584Y2 JP 1982145743 U JP1982145743 U JP 1982145743U JP 14574382 U JP14574382 U JP 14574382U JP S6326584 Y2 JPS6326584 Y2 JP S6326584Y2
- Authority
- JP
- Japan
- Prior art keywords
- camshaft
- lever
- friction
- friction lever
- brake
- 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
Links
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229920001875 Ebonite Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
Description
【考案の詳細な説明】
本考案は機械式ドラムブレーキのオートアジヤ
スタ装置に関するものである。[Detailed Description of the Invention] The present invention relates to an auto-adjuster device for a mechanical drum brake.
小型の機械式ドラムブレーキでは、ドラムとブ
レーキシユーとの間隙を自動調整するオートアジ
ヤスタ装置の組込みが非常に困難であり、従来、
種々の装置が提案されているが、機構が複雑であ
つたり、形状が大きかつたり、トルクの伝達容量
が不足であつたり等の問題点が多い。 In small mechanical drum brakes, it is extremely difficult to incorporate an auto-adjuster device that automatically adjusts the gap between the drum and the brake shoe.
Although various devices have been proposed, there are many problems such as complicated mechanisms, large shapes, and insufficient torque transmission capacity.
本考案は上記の如き事情に鑑みてなされたもの
であり、トルクの伝達にフリクシヨンレバーを使
用し、ブレーキシユーの拡開用カムの軸に設けた
歯部に、バツキングプレートに微少回動を許容さ
れて装着した環状部材の外周に形成した弾性爪を
係止させて、構造簡単にしてバツキングプレート
内に収容し易く、かつトルク伝達の確実なオート
アジヤスタ装置を提供することを目的としてい
る。 The present invention was developed in view of the above circumstances, and uses a friction lever to transmit torque.The teeth provided on the shaft of the brake shoe's expansion cam are provided with minute rotations on the bucking plate. To provide an auto-adjuster device which has a simple structure, can be easily housed in a bucking plate, and can ensure reliable torque transmission by locking elastic claws formed on the outer periphery of an annular member mounted so as to be allowed to move. The purpose is
本考案に係るドラムブレーキのオートアジヤス
タ装置について図面に基いて説明する。 An auto-adjuster device for a drum brake according to the present invention will be explained based on the drawings.
第１図に機械式ドラムブレーキを示す。１はバ
ツキングプレート、２，３はブレーキシユー、４
はアンカー、５，６は戻しばね、７はカムであ
り、カム７を外力によつて回動させてアンカー４
を支点としてブレーキシユー２，３の一端を拡開
して図外のブレーキドラムにブレーキシユー２，
３を押圧して制動し、外力を除去してカム７を復
帰させると、ブレーキシユー２，３が戻しばね
５，６の引張力により図外のブレーキドラムより
離脱して制動力が解除される。 Figure 1 shows a mechanical drum brake. 1 is the bucking plate, 2 and 3 are the brake shoes, 4
is an anchor, 5 and 6 are return springs, and 7 is a cam, and the cam 7 is rotated by an external force to release the anchor 4.
Using the brake shoes 2 and 3 as a fulcrum, expand one end of the brake shoes 2 and 3 and attach the brake shoes 2 and 3 to the brake drum (not shown).
When the brake shoes 2 and 3 are released from the brake drum (not shown) due to the tensile force of the return springs 5 and 6, the braking force is released. Ru.
オートアジヤスタ装置について、第２図乃至６
図を併用して説明する。 Regarding the auto adjuster device, Figures 2 to 6
This will be explained using figures.
カム軸７ａのバツキングプレート１の内方に突
出する基端部の外周には、第４図に示す如く、カ
ム７の制動時の回動方向Ｂ側を傾斜面８ａとし、
反対面を直径方向の直立面８ｂとする複数個の歯
を有する歯部８を設けてある。９は環状部材であ
り、第５図イ，ロに示す如く、短筒部にＬ字形の
切り目を入れて内方に折り曲げて複数個の弾性爪
９ａを形成し、かつその一端環状部に外方に突出
する複数個の突起９ｂを設けてある。該複数個の
弾性爪９ａは歯部８の歯ピツチ間において若干の
ずれを有する如くに設けてあり、いずれか一つの
弾性爪９ａが歯部８の歯に係止して微調整し得る
如くに形成されている（第４図参照）。かかる環
状部材９がカム軸７ａに遊嵌され、弾性爪９ａは
外方より歯部８に係止し得る。又複数個の突起９
ｂはバツキングプレートに穿設した複数個の穴１
ａにそれぞれ遊間δ1をもつて微小回動を許容され
て挿入されており、遊間δ1が図外のブレーキドラ
ムとブレーキシユー２，３との設定隙間となる。 As shown in FIG. 4, the outer periphery of the proximal end of the camshaft 7a that protrudes inward from the bucking plate 1 is provided with an inclined surface 8a facing in the direction B of rotation when the cam 7 is braked.
A tooth portion 8 is provided having a plurality of teeth whose opposite surface is a diametrically upright surface 8b. Reference numeral 9 denotes an annular member, and as shown in FIGS. 5A and 5B, an L-shaped cut is made in the short cylindrical part and bent inward to form a plurality of elastic claws 9a, and one end of the annular part is provided with an external part. A plurality of protrusions 9b are provided that protrude in the opposite direction. The plurality of elastic pawls 9a are provided so that there is a slight deviation between the tooth pitches of the tooth portion 8, so that any one of the elastic pawls 9a can be engaged with the teeth of the tooth portion 8 for fine adjustment. (See Figure 4). The annular member 9 is loosely fitted onto the camshaft 7a, and the elastic pawl 9a can be engaged with the tooth portion 8 from the outside. Also, a plurality of protrusions 9
b is a plurality of holes 1 drilled in the bucking plate
a, each having a clearance δ 1 and allowing slight rotation, and the clearance δ 1 serves as a set clearance between the brake drum and the brake shoes 2 and 3 (not shown).
次にカム７にトルクを与えるフリクシヨン機構
について説明する。１０は制動時に外力が与えら
れる外側レバーであり、外力は第１図の矢印Ａ方
向に与えられるものとする。外側レバー１０は少
なくとも下方に開口を有する空洞１０ａを有し、
その両側壁１０ｂ，１０ｃにピン１１を挿通して
ある。１２は硬質ゴム等よりなるフリクシヨンレ
バーであり、その上端部にピン１１が遊挿され、
外側レバー１０への外力の方向側（矢印Ａ側）の
肩部１２ａは曲面をなして外側レバー１０の作動
時に空洞１０ａの上壁曲面１０a′によつて押圧さ
れる。反対側の側面と空洞１０ａの側壁１０a″と
の間には間隙δ2を設けてある。フリクシヨンレバ
ー１２の下端面は、第６図に示す如くカム軸７ａ
の外周に接触する円弧状凹曲面部１２ｂを設け、
カム軸７ａの回動方向Ｂの反対側は若干の逃げを
設けて平面部１２ｃに、矢印Ｂ側は平面部１２ｄ
に接続している。そして円弧状凹曲面部１２ｂ
は、その中心点O2をカム軸７ａの中心O1より矢
印Ｂ側にS1だけずらせたカム軸７ａよりは大径の
円弧で形成されている。角θは、フリクシヨンレ
バー１２とカム軸７ａとの摩擦角を示し、角θと
カム軸７ａ外周との交点Ｐに円弧状凹曲面部１２
ｂが当接するのが好ましく、新製時の円弧状凹曲
面部１２ｂの先端を当接させておくと、前記した
如く円弧状凹曲面部１２ｂは中心点O2がカム軸
７ａの中心O1より矢印Ｂ側にずれたカム軸７ａ
よりは大径の円弧で形成されており、かつフリク
シヨンレバー１２は後記する結合ピン１４の周り
に矢印Ｂと反対方向の回動勝手にカム軸７ａを押
圧するので、寸法誤差や、円弧状凹曲面部１２ｂ
の摩耗によつても当接点が円弧状凹曲面部１２ｂ
の外方にずれるのみで必ず円弧凹曲面部１２ｂが
カム軸７ａ外周のＰ点付近に当接するようにな
る。又円弧状凹曲面部１２ｂの高さS2は寸法誤差
や摩耗にかかわらず、制動時にカム軸７ａを乗り
越さないように配慮してある。又円弧状凹曲面部
１２ｂに波形の凹凸等を設けてフリクシヨンの増
加を計つてもよい。１３はＵ字形をなすフリクシ
ヨンレバー１２の保持具であり、フリクシヨンレ
バー１２の下部を挾装して結合ピン１４にて外側
レバー１０、フリクシヨンレバー１２と共に回動
可能に結合されている。１５ａ，１５ｂは第１円
筒コイルばねであり、それぞれ一端を外側レバー
１０に係止し、ピン１１に巻き付けられて他端に
てフリクシヨンレバーの肩部１２ａを押圧して、
その円弧状凹曲面部１２ｂを常時カム軸７ａ面に
当接させ、外側レバー１０とフリクシヨンレバー
１２とを弾性的に結合し、かつピン１１の抜け止
めの作用をしている。Ｕ字形をなす保持具１３に
は、両側壁を貫通してカム軸７ａが遊挿されてい
る。保持具１３の下端部には両側壁端面間にボル
ト１６がナツト１６ａにて固定されている。中央
部においてカム軸７ａに遊嵌し、基部を折り曲げ
てつばつき座金状に形成されて、該つばつき座金
状部にボルト１６が挿通され、つばがナツト１６
ａに係止されて保持具１３と一体となるインジケ
ートプレート１７の先端部をバツキングプレート
に設けた突起１ｂに係止させて取付時、すなわち
非制動時の外側レバー１０、フリクシヨンレバー
１２、保持具１３の通常位置決めをしてある。１
８は第２円筒コイルばねであり、一端をバツキン
グプレート１に設けた突起１ｃに係止し、カム軸
７ａに巻きつけられて他端にて結合ピン１４を押
圧して、制動解除時のフリクシヨンレバー１２の
元位置への復帰を確実ならしめている。 Next, the friction mechanism that applies torque to the cam 7 will be explained. Reference numeral 10 denotes an outer lever to which external force is applied during braking, and the external force is applied in the direction of arrow A in FIG. The outer lever 10 has a cavity 10a having an opening at least downward,
A pin 11 is inserted through both side walls 10b and 10c. 12 is a friction lever made of hard rubber or the like, into which a pin 11 is loosely inserted;
The shoulder portion 12a on the side in the direction of external force applied to the outer lever 10 (arrow A side) has a curved surface and is pressed by the upper wall curved surface 10a' of the cavity 10a when the outer lever 10 is actuated. A gap δ 2 is provided between the opposite side surface and the side wall 10a'' of the cavity 10a.The lower end surface of the friction lever 12 is connected to the camshaft 7a as shown in FIG.
An arcuate concave curved surface portion 12b is provided which contacts the outer periphery of the
The opposite side of the rotation direction B of the camshaft 7a is provided with a slight clearance to form a flat part 12c, and the side of the arrow B is a flat part 12d.
is connected to. And arcuate concave curved surface portion 12b
is formed by an arc having a larger diameter than the camshaft 7a with its center point O 2 shifted by S 1 toward the arrow B side from the center O 1 of the camshaft 7a. The angle θ indicates the friction angle between the friction lever 12 and the camshaft 7a, and the arc-shaped concave curved surface portion 12 is located at the intersection P between the angle θ and the outer periphery of the camshaft 7a.
It is preferable that the points b are in contact with each other, and if the tips of the newly manufactured arcuate concave curved surface portions 12b are brought into contact with each other, the center point O 2 of the arcuate concave curved surface portion 12b will be the center point O 1 of the camshaft 7a as described above. The camshaft 7a is shifted more toward the arrow B side.
Since the friction lever 12 presses the camshaft 7a around a connecting pin 14 (to be described later) in a direction opposite to the arrow B, dimensional errors and arc-shaped Concave curved surface portion 12b
Even due to wear, the contact point remains in the arcuate concave curved surface portion 12b
Just by shifting outward, the arcuate concave curved surface portion 12b always comes into contact with the vicinity of point P on the outer periphery of the camshaft 7a. Further, the height S 2 of the arcuate concave curved surface portion 12b is designed so that it does not go over the camshaft 7a during braking, regardless of dimensional errors or wear. Further, the arc-shaped concave curved surface portion 12b may be provided with wave-like unevenness or the like to increase the friction. Reference numeral 13 denotes a U-shaped holder for the friction lever 12, which clamps the lower part of the friction lever 12 and is rotatably coupled with the outer lever 10 and the friction lever 12 by a coupling pin 14. Reference numerals 15a and 15b are first cylindrical coil springs, each having one end locked to the outer lever 10, wound around the pin 11, and the other end pressing the shoulder 12a of the friction lever.
The arcuate concave curved surface portion 12b is always brought into contact with the surface of the camshaft 7a, elastically connecting the outer lever 10 and the friction lever 12, and acting to prevent the pin 11 from coming off. A cam shaft 7a is loosely inserted into the U-shaped holder 13 through both side walls. A bolt 16 is fixed to the lower end of the holder 13 between the end faces of both side walls with a nut 16a. The central part is loosely fitted onto the camshaft 7a, the base is bent to form a flange washer shape, a bolt 16 is inserted through the flange washer shape, and the flange is inserted into the nut 16.
The outer lever 10 and the friction lever 12 are attached when the indicator plate 17 is engaged with the protrusion 1b provided on the bucking plate, i.e. when not braking, with the tip of the indicator plate 17 being integrated with the holder 13 being engaged with the retainer 13. , the holder 13 is normally positioned. 1
Reference numeral 8 designates a second cylindrical coil spring, one end of which is engaged with a protrusion 1c provided on the bucking plate 1, wound around the camshaft 7a, and the other end of which presses the coupling pin 14, so that when the brake is released, This ensures that the friction lever 12 returns to its original position.
次に、作用について、外側レバー１０に矢印Ａ
方向の引き力を与えた場合について説明する。 Next, regarding the action, mark the arrow A on the outer lever 10.
The case where a directional pulling force is applied will be explained.
外側レバー１０、フリクシヨンレバー１２、保
持具１３は結合ピン１４を介して一体となつて第
２円筒コイルばね１８の復元弾撥力によつて外力
と反対方向に付勢され、インジケートプレート１
７の先端部が突起１ｂに当接して位置決めされ、
かつ第１コイルばね１５ａ，１５ｂにて付勢され
たフリクシヨンレバーの円弧状凹曲面部１２ｂは
カム軸７ａの右上面（第２図上にて）に当接して
いる。かかる状態にて、外側レバー１０に矢印方
向の引き力を加えると外側レバー１０は結合ピン
１４を支軸として回動し、空洞の上壁曲面１０
a′はフリクシヨンレバーの肩部１２ａを押圧し、
この押圧力は、フリクシヨンレバー１２の側面と
空洞の側壁１０a″との間に間隙δ2を設けてあるの
で支障なく第１円筒コイルばね１５ａ，１５ｂの
弾撥力に付加されて円弧状凹曲面部１２ｂをカム
軸７ａの右上面に押圧して、カム軸７ａを摩擦力
にて矢印Ｂ方向に回動させ、カム７はブレーキシ
ユー２，３の一端をアンカー４を支点として拡開
してブレーキシユー２，３を図外のドラムに押圧
して制動力を生ずる。その際にブレーキシユー
２，３の摩耗によつてドラムとブレーキシユー
２，３との間隙が所定値を超過していると、環状
部材のいずれかの弾性爪９ａが歯部８の一歯を乗
り越えて次位の歯と係合し得る状態となる。外側
レバー１０への引き力を除くとブレーキシユー
２，３は戻しばね５，６の作用によつて図外のド
ラムより離脱し、カム７は一歯送られた状態とな
り、かつ環状部材９はバツキングプレートの穴１
ａと突起９ｂとの間隙δ1だけ押し戻されて設定ク
リアランスを確保することとなつてシユー間隙が
オートアジヤストされる。この間に外側レバー１
０、フリクシヨンレバー１２、保持具１３は第２
円筒コイルばね１８の復元弾撥力によつて、スト
ツパたるインジケートプレート１７の先端部が突
起１ｂに当接するまで押し戻されて元位置に復帰
し、かつフリクシヨンレバー１２は第１円筒コイ
ルばね１５ａ，１５ｂにて付勢されているのでそ
の円弧状凹曲面部１２ｂをカム軸７ａの右上面に
当接して次回の制動に備える。 The outer lever 10, the friction lever 12, and the holder 13 are integrally connected via the connecting pin 14, and are urged in the opposite direction to the external force by the restoring elastic force of the second cylindrical coil spring 18, and the indicator plate 1
The tip of 7 is positioned by contacting the protrusion 1b,
The arcuate concave curved surface portion 12b of the friction lever, which is biased by the first coil springs 15a and 15b, is in contact with the upper right surface (as viewed in FIG. 2) of the camshaft 7a. In this state, when a pulling force is applied to the outer lever 10 in the direction of the arrow, the outer lever 10 rotates about the coupling pin 14, and the upper wall curved surface 10 of the cavity is rotated.
a' presses the shoulder 12a of the friction lever,
This pressing force is applied to the elastic force of the first cylindrical coil springs 15a and 15b without any problem because a gap δ 2 is provided between the side surface of the friction lever 12 and the side wall 10a'' of the cavity. The curved surface portion 12b is pressed against the upper right surface of the camshaft 7a, and the camshaft 7a is rotated in the direction of arrow B by frictional force, and the cam 7 is expanded with one end of the brake shoes 2 and 3 using the anchor 4 as a fulcrum. The brake shoes 2 and 3 are pressed against a drum (not shown) to generate braking force.At this time, due to wear of the brake shoes 2 and 3, the gap between the drum and the brake shoes 2 and 3 decreases to a predetermined value. If the tension exceeds 1, the elastic pawl 9a of the annular member can overcome one tooth of the tooth portion 8 and engage with the next tooth.When the pulling force on the outer lever 10 is removed, the brake The shoes 2 and 3 are separated from the drum (not shown) by the action of the return springs 5 and 6, the cam 7 is advanced by one tooth, and the annular member 9 is inserted into the hole 1 of the bucking plate.
The shoe gap is automatically adjusted by being pushed back by the gap δ 1 between the protrusion 9b and the protrusion 9b to secure the set clearance. During this time, use the outer lever 1.
0, the friction lever 12 and the holder 13 are the second
Due to the restoring elastic force of the cylindrical coil spring 18, the tip of the indicator plate 17 serving as a stopper is pushed back until it comes into contact with the protrusion 1b and returns to its original position, and the friction lever 12 is moved by the first cylindrical coil spring 15a. , 15b, the arcuate concave curved surface portion 12b comes into contact with the upper right surface of the camshaft 7a in preparation for the next braking.
なお、ピン１１が折損した場合は、外側レバー
１０に引き力を与えば、フリクシヨンレバー１２
の側面と空洞の側壁１０a″との間隙δ2を零とし
て、フリクシヨンレバー１２でカム軸７ａを回動
させて制動力を確保することもできる。 If the pin 11 is broken, applying a pulling force to the outer lever 10 will cause the friction lever 12 to break.
It is also possible to ensure the braking force by rotating the camshaft 7a with the friction lever 12 by setting the gap δ 2 between the side surface and the side wall 10a'' of the cavity to be zero.
第７図乃至第９図に基いて第２実施例について
説明する。第２実施例においてはフリクシヨン機
構が第１実施例と異なつており、他は同様に構成
されている。１０′は外側レバーである。１２′は
硬質ゴム等よりなるフリクシヨンレバーであり、
Ｕ字形に形成され、両側壁に通孔１２′ａを設け
てある。そして通孔１２′ａの右上曲面部（第７
図上にて）、すなわちカム軸７ａに当接する部分
は第９図に示す如く第１実施例と同様に円弧状凹
曲面部１２′ｂを形成し、他の部分はカム軸７ａ
に対し遊間を設けてある。 A second embodiment will be described based on FIGS. 7 to 9. In the second embodiment, the friction mechanism is different from the first embodiment, but the other structures are the same. 10' is an outer lever. 12' is a friction lever made of hard rubber or the like;
It is formed in a U-shape and has through holes 12'a in both side walls. Then, the upper right curved surface part (the seventh part) of the through hole 12'a
In other words, the part that comes into contact with the camshaft 7a forms an arcuate concave curved surface part 12'b as in the first embodiment, as shown in FIG.
There is a play area for the children.
１５′は第１円筒コイルばねであり、中央部１
５′ａは外側レバー１０′の外力の作用方向矢印Ａ
の側に係止し、外側レバー１０′とフリクシヨン
レバー１２′とを結合する結合ピン１４′に巻き付
けられて両端部１５′ｂはフリクシヨンレバー１
２′の矢印Ａ側を付勢して常時フリクシヨンレバ
ーの円弧状凹曲面部１２′ｂをカム軸７ａに当接
させ外側レバー１０′とフリクシヨンレバー１
２′とを弾性的に結合している。 15' is a first cylindrical coil spring;
5'a is the action direction arrow A of the external force on the outer lever 10'
The ends 15'b are fixed to the side of the friction lever 1, and are wound around a connecting pin 14' that connects the outer lever 10' and the friction lever 12'.
The arrow A side of 2' is biased to constantly bring the arc-shaped concave curved surface 12'b of the friction lever into contact with the camshaft 7a, thereby causing the outer lever 10' and the friction lever 1 to be brought into contact with each other.
2' are elastically connected.
１６はボルト、１６ａはナツト、１７はインジ
ケータプレート、１ｂ，１ｃはそれぞれバツキン
グプレート１に設けた突起であり、第２円筒コイ
ルばね１８は一端を突起１ｃに係止し、カム軸７
ａに巻き付けられて他端にて結合ピン１４′を矢
印Ａと反対方向に付勢しており、インジケータプ
レート１７が突起１ｂに当接してフリクシヨンレ
バー１２′の位置決めをしており、第１円筒コイ
ルばね１５′にて付勢されたフリクシヨンレバー
の円弧状凹曲面部１２′ｂにてカム軸７ａの右上
面（第７図上にて）に当接している。外側レバー
１０′に矢印Ａ方向の引き力を与えるとカム７を
矢印Ｂ方向に回動させて第１実施例と同様の作用
効果を生じる。 16 is a bolt, 16a is a nut, 17 is an indicator plate, 1b and 1c are protrusions provided on the backing plate 1, and the second cylindrical coil spring 18 has one end locked to the protrusion 1c, and the camshaft 7
The other end of the connecting pin 14' is urged in the direction opposite to the arrow A, and the indicator plate 17 abuts against the protrusion 1b to position the friction lever 12'. The arc-shaped concave curved surface portion 12'b of the friction lever, which is biased by a cylindrical coil spring 15', abuts against the upper right surface (as viewed in FIG. 7) of the camshaft 7a. When a pulling force is applied to the outer lever 10' in the direction of arrow A, the cam 7 is rotated in the direction of arrow B, producing the same effect as in the first embodiment.
本考案に係る機械式ドラムブレーキのオートア
ジヤスタ装置は、バツキングプレートに回動可能
に支承されたカム軸に設けたブレーキシユー拡開
用カムを、バツキングプレート上に対峙する一対
のブレーキシユーの端部間に挾装し、外力の作用
する外側レバーと共に回動可能に結合ピンにて結
合され、かつばねにて外側レバーと弾性的に結合
され、一端部に形成された円弧状凹曲面部が該カ
ム軸に当接するように付勢されたフリクシヨンレ
バーを設け、外側レバーの回動によつて共に回動
するフリクシヨンレバーとの摩擦力によつてカム
軸が回動して一対のブレーキシユーを拡開するよ
う構成し、カム軸に歯部を設け、バツキングプレ
ートに対し微小回動を許容してカム軸に環装する
環状部材に、該歯部に係止し得る弾性爪を設ける
と共に、前記結合ピンを外側レバーへの入力方向
と反対方向に付勢するばねと、結合ピンを通常位
置に停止させるためのフリクシヨンレバーとバツ
キングプレートとの間のストツパとを設けた機械
式ドラムブレーキのオートアジヤスタ装置であ
る。 The auto-adjuster device for mechanical drum brakes according to the present invention connects a pair of brakes facing each other on the bucking plate to a brake shoe expanding cam provided on a camshaft rotatably supported on the bucking plate. It is sandwiched between the ends of the shoe, is rotatably connected with the outer lever on which an external force is applied, by a connecting pin, is elastically connected to the outer lever by a spring, and has a circular arc shape formed at one end. A friction lever is provided whose concave curved surface portion is biased to come into contact with the camshaft, and the camshaft is rotated by the frictional force between the friction lever and the friction lever that rotate together when the outer lever rotates. The camshaft is provided with toothed portions, and the annular member that is attached to the camshaft while allowing minute rotation relative to the bucking plate is engaged with the toothed portions. a spring for biasing the coupling pin in a direction opposite to the input direction to the outer lever; and a stopper between the friction lever and the bucking plate for stopping the coupling pin in its normal position. This is an auto-adjuster device for mechanical drum brakes that is equipped with.
従つて下記の如き効果がある。 Therefore, the following effects are obtained.
(1) ブレーキドラムとブレーキシユーとの隙間調
整をカム軸に設けた歯部と環状部材の弾性爪と
の係合で行うのでブレーキドラム内の構成が簡
単となりスペース的に有利で組立が容易となつ
た。(1) The gap between the brake drum and the brake shoe is adjusted by engaging the teeth on the camshaft with the elastic pawls on the annular member, which simplifies the internal configuration of the brake drum, saves space, and facilitates assembly. It became.
(2) 外側レバーとフリクシヨンレバーとが一体と
なつてトルクをフリクシヨンによりカム軸に与
えるので強度的に有利である。(2) The outer lever and the friction lever work together to apply torque to the camshaft through friction, which is advantageous in terms of strength.
(3) フリクシヨンレバーがバツキングプレートの
外方にあるので、カム軸の径、フリクシヨンレ
バーのサイズの選定によつてトルクの伝達容量
の確保が容易である。(3) Since the friction lever is located outside the bucking plate, it is easy to ensure torque transmission capacity by selecting the diameter of the camshaft and the size of the friction lever.
(4) フリクシヨンレバーの位置決めが第２円筒コ
イルばねとストツパたるインジケートプレート
とによつて確実になされる。(4) The positioning of the friction lever is ensured by the second cylindrical coil spring and the indicator plate serving as a stopper.
(5) 環状部材の弾性爪を複数個とすることによつ
てシユー間隙が微調整される。(5) The shoe gap can be finely adjusted by providing a plurality of elastic claws on the annular member.
(6) 環状部材の弾性爪とバツキングプレートに係
止する突起部とでカム軸の歯止め機構としたの
でその構造が簡単になつた。(6) The structure is simplified because the elastic pawl of the annular member and the protrusion that engages with the bucking plate form the pawl mechanism for the camshaft.
第１図は本考案に係る機械式ドラムブレーキの
一部切開図、第２図は本考案に係る機械式ドラム
ブレーキのオートアジヤスタ装置の第１実施例を
示す正面図、第３図は同側面図、第４図はカム軸
の歯部と環状部材の弾性爪との関係を示す図、第
５図イは環状部材の平面図、同ロは同じく側面
図、第６図はフリクシヨンレバーとカム軸との関
係を示す説明図、第７図は本考案に係る機械式ド
ラムブレーキのオートアジヤスタ装置の第２実施
例を示す正面図、第８図は同レバー装置の側面
図、第９図は第２実施例のフリクシヨンレバーの
平面図である。
１……バツキングプレート、１ａ……穴、１
ｂ，１ｃ……突起、２，３……ブレーキシユー、
７……カム、７ａ……カム軸、８……歯部、８ａ
……傾斜面、８ｂ……直立面、９……環状部材、
９ａ……弾性爪、９ｂ……突起、１０……外側レ
バー、１０ａ……空洞、１０a′……上壁曲面、１
０a″……側壁、１２……フリクシヨンレバー、１
２ａ……肩部、１２ｂ……円弧状凹曲面部、１３
……保持具、１４……結合ピン、１５′，１５ａ，
１５ｂ……第１円筒コイルばね、１６……ボル
ト、１７……インジケートプレート（ストツパ）、
１８……第２円筒コイルばね、Ａ……引き力の作
用する方向を示す、Ｂ……カム軸の回動方向を示
す。
Fig. 1 is a partially cutaway view of a mechanical drum brake according to the present invention, Fig. 2 is a front view showing a first embodiment of an auto-adjuster device for a mechanical drum brake according to the present invention, and Fig. 3 is the same. 4 is a side view showing the relationship between the teeth of the camshaft and the elastic pawl of the annular member, FIG. 5 A is a plan view of the annular member, FIG. 7 is a front view showing a second embodiment of the automatic adjuster device for a mechanical drum brake according to the present invention, and FIG. 8 is a side view of the same lever device. FIG. 9 is a plan view of the friction lever of the second embodiment. 1... Batching plate, 1a... Hole, 1
b, 1c... protrusion, 2, 3... brake shoe,
7... Cam, 7a... Cam shaft, 8... Teeth, 8a
... Inclined surface, 8b ... Upright surface, 9 ... Annular member,
9a...Elastic claw, 9b...Protrusion, 10...Outside lever, 10a...Cavity, 10a'...Top wall curved surface, 1
0a″...Side wall, 12...Friction lever, 1
2a... Shoulder portion, 12b... Arc-shaped concave curved surface portion, 13
... Holder, 14 ... Connection pin, 15', 15a,
15b...first cylindrical coil spring, 16...bolt, 17...indicator plate (stopper),
18... Second cylindrical coil spring, A... Indicates the direction in which the pulling force acts, B... Indicates the rotating direction of the camshaft.
Claims (1)
ム軸に設けたブレーキシユー拡開用カムを、バツ
キングプレート上に対峙する一対のブレーキシユ
ーの端部間に挾装し、外力の作用する外側レバー
と共に回動可能に結合ピンにて結合され、かつば
ねにて外側レバーと弾性的に結合され、一端部に
形成された円弧状凹曲面部が該カム軸に当接する
ように付勢されたフリクシヨンレバーを設け、外
側レバーの回動によつて共に回動するフリクシヨ
ンレバーとの摩擦力によつてカム軸が回動して一
対のブレーキシユーを拡開するよう構成し、カム
軸に歯部を設け、バツキングプレートに対し微小
回動を許容してカム軸に環装する環状部材に、該
歯部に係止し得る弾性爪を設けると共に、前記結
合ピンを外側レバーへの入力方向と反対方向に付
勢するばねと、結合ピンを通常位置に停止させる
ためのフリクシヨンレバーとバツキングプレート
との間のストツパとを設けたことを特徴とする機
械式ドラムブレーキのオートアジヤスタ装置。 A brake shoe expanding cam provided on a camshaft rotatably supported on the bucking plate is sandwiched between the ends of a pair of brake shoes facing each other on the bucking plate, and an external force is applied to the brake shoe expansion cam. It is rotatably coupled with the outer lever by a coupling pin, is elastically coupled to the outer lever by a spring, and is biased so that the arc-shaped concave curved surface formed at one end comes into contact with the camshaft. A friction lever is provided, and when the outer lever rotates, the camshaft rotates due to the frictional force between the friction lever and the friction lever, which rotates together, and the cam shaft rotates to spread out the pair of brake shoes. A toothed portion is provided on the shaft, and an annular member that is encircled around the camshaft while allowing minute rotation with respect to the bucking plate is provided with an elastic pawl that can be engaged with the toothed portion, and the connecting pin is connected to the outer lever. A mechanical drum brake automatic, characterized in that it is provided with a spring that biases in the opposite direction to the input direction of the input signal, and a stopper between the friction lever and the bucking plate that stops the coupling pin in the normal position. Adjuster device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14574382U JPS5951228U (en) | 1982-09-28 | 1982-09-28 | Drum brake auto adjuster device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14574382U JPS5951228U (en) | 1982-09-28 | 1982-09-28 | Drum brake auto adjuster device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5951228U JPS5951228U (en) | 1984-04-04 |
| JPS6326584Y2 true JPS6326584Y2 (en) | 1988-07-19 |
Family
ID=30324621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14574382U Granted JPS5951228U (en) | 1982-09-28 | 1982-09-28 | Drum brake auto adjuster device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5951228U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5666532A (en) * | 1979-10-30 | 1981-06-05 | Nissin Kogyo Kk | Automatic adjuster for braking gap of mechanical drum brake |
-
1982
- 1982-09-28 JP JP14574382U patent/JPS5951228U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5666532A (en) * | 1979-10-30 | 1981-06-05 | Nissin Kogyo Kk | Automatic adjuster for braking gap of mechanical drum brake |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5951228U (en) | 1984-04-04 |
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