JPH0547295Y2

JPH0547295Y2 -

Info

Publication number: JPH0547295Y2
Application number: JP1989150410U
Authority: JP
Priority date: 1989-12-26
Filing date: 1989-12-26
Publication date: 1993-12-13
Anticipated expiration: 2003-12-13
Also published as: JPH0388037U

Description

【考案の詳細な説明】〔産業上の利用分野〕本考案は、自動車や自動二輪車等の車両用デイ
スクブレーキのピストン対向型キヤリパに係り、
詳しくは、３個以上のシリンダ孔を両作用部に対
向して設けたピストン対向型のキヤリパに関す
る。[Detailed description of the invention] [Field of industrial application] The present invention relates to a piston-opposed caliper for disc brakes for vehicles such as automobiles and motorcycles.
Specifically, the present invention relates to a piston-opposed caliper in which three or more cylinder holes are provided facing both working parts.

[Conventional technology]

四輪自動車等の車両に適用されるデイスクブレ
ーキでは、デイスクロータの有効半径を稼ぎ、且
つデイスクロータの両側に対向配置される一対の
摩擦パツドをデイスクロータに平均して押圧でき
るように、両摩擦パツドを挟んで配設されるキヤ
リパの両作用部に、摩擦パツドをデイスクロータ
に押圧するピストンを夫々内挿する小径のシリン
ダ孔をデイスク周方向に２個づつを対向並設した
４ポツトのピストン対向型や、デイスク回入側か
らデイスク回出側に亘つてデイスク周方向に片側
３個づつを対向並設させた６ポツトピストン対向
型が知られている（例えば特公昭37−6761号公報
参照）。 In disc brakes applied to vehicles such as four-wheeled vehicles, both friction pads are used to increase the effective radius of the disc rotor and to press a pair of friction pads facing each other on both sides of the disc rotor evenly against the disc rotor. A 4-pot piston with two small-diameter cylinder holes arranged in parallel in the circumferential direction of the disk, each of which inserts a piston that presses the friction pad against the disk rotor, in both acting parts of the caliper, which is placed across the pad. A facing type and a 6-pot piston facing type in which three pistons are arranged in parallel on each side in the circumferential direction of the disk from the disk rotation side to the disk rotation side are known (for example, see Japanese Patent Publication No. 37-6761). ).

[The problem that the idea attempts to solve]

しかしながら、片側に３個以上のシリンダ孔を
持つキヤリパでは、デイスク周方向の長さが増加
するため、デイスク回入及び回出側のシリンダ孔
の周辺は、分割された双方のキヤリパ半体を連結
する締結ボルトに近接しているので、剛性が保持
されるのに対し、中間のシリンダ孔の周辺は、剛
体部分から離れていることから剛性力がダウン
し、キヤリパの中間部が、制動時に反デイスク方
向に撓んで、摩擦パツドのライニングに偏摩耗を
生じることとなる。さらに、このようにしてキヤ
リパの中間部が撓み易いので、制動フイーリング
も、ふわふわとした剛性感のない感じ悪いものと
なる。 However, in a caliper with three or more cylinder holes on one side, the circumferential length of the disk increases, so the area around the cylinder holes on the disk rotation and rotation sides connects the two divided caliper halves. Since the caliper is close to the fastening bolt, its rigidity is maintained, whereas the area around the intermediate cylinder hole is far from the rigid body part, so the rigidity is reduced, and the intermediate part of the caliper suffers from reaction during braking. This bends in the direction of the disk, causing uneven wear on the lining of the friction pad. Furthermore, since the intermediate portion of the caliper is easily bent in this way, the braking feeling is also unpleasant with a fluffy and lack of rigidity.

本考案は、かかる実情を背景にしてなされたも
ので、その目的とするところは、キヤリパの中間
部に剛性を持たせて、制動時の撓みを抑止するこ
とにより、ライニングの偏摩耗を防止すると共
に、制動フイーリングの向上を図つた車両用デイ
スクブレーキのピストン対向型キヤリパを提供す
ることにある。 The present invention was developed against this background, and its purpose is to prevent uneven wear of the lining by providing rigidity to the middle part of the caliper and suppressing deflection during braking. Another object of the present invention is to provide a piston-opposed caliper for a vehicle disc brake that improves braking feeling.

[Means to solve the problem]

本考案は、上述の目的を達成するため、その１
は、デイスクロータの両側に対向配置した一対の
摩擦パツドを挟んで配設される両作用部に、該摩
擦パツドをデイスクロータに押圧するピストンを
夫々内挿する３個以上のシリンダ孔をデイスク回
入側からデイスク回出側に亘つてデイスク周方向
に対向並設した車両用デイスクブレーキのピスト
ン対向型キヤリパにおいて、前記複数のシリンダ
孔のうち、デイスク回入及び回出側のシリンダ孔
よりも中間のシリンダ孔を小径に形成すると共
に、中間のシリンダ孔を囲繞するボス部の外周
に、補強用肉盛りを施したことを特徴とし、その
２は、前記複数のシリンダ孔のうち、デイスク回
入及び回出側のシリンダ孔よりも中間のシリンダ
孔を小径に形成すると共に、中間のシリンダ孔を
囲繞するボス部と該中間のシリンダ孔のボス部に
隣接する他のシリンダ孔のボス部との間のデイス
ク外周側及びデイスク内周側部分に補強用隆起部
を設けたことを特徴とし、その３は、前記複数の
シリンダ孔のうち、デイスク回入及び回出側のシ
リンダ孔よりも中間のシリンダ孔を小径に形成
し、中間のシリンダ孔を囲繞するボス部の外周
に、補強用肉盛りを施すと共に、中間のシリンダ
孔を囲繞するボス部と該中間のシリンダ孔のボス
部に隣接する他のシリンダ孔のボス部との間のデ
イスク外周側及びデイスク内周側部分に補強用隆
起部を設けたことを特徴とするものである。 In order to achieve the above-mentioned purpose, the present invention has the following objectives:
The disc rotor is equipped with three or more cylinder holes into which pistons for pressing the friction pads against the disc rotor are inserted, respectively, in both acting parts which are arranged sandwiching a pair of friction pads arranged oppositely on both sides of the disc rotor. In a piston-opposed caliper of a vehicle disc brake that is arranged in parallel in the circumferential direction of the disk from the entry side to the disc rotation side, among the plurality of cylinder holes, the cylinder hole on the disk rotation side and the cylinder hole on the disk rotation side are arranged in parallel. The cylinder hole is formed to have a small diameter, and the outer periphery of the boss portion surrounding the intermediate cylinder hole is provided with reinforcement padding. The intermediate cylinder hole is formed to have a smaller diameter than the cylinder hole on the output side, and a boss portion surrounding the intermediate cylinder hole and a boss portion of another cylinder hole adjacent to the boss portion of the intermediate cylinder hole are formed. A reinforcing protuberance is provided on the outer circumferential side of the disk and on the inner circumferential side of the disk between the cylinder holes. The cylinder hole is formed to have a small diameter, and reinforcement is applied to the outer periphery of the boss portion surrounding the intermediate cylinder hole, and the boss portion surrounding the intermediate cylinder hole is adjacent to the boss portion of the intermediate cylinder hole. It is characterized in that reinforcing protuberances are provided on the outer circumferential side of the disk and on the inner circumferential side of the disk between the boss portions of other cylinder holes.

[Effect]

かかる構成により、小径に形成した中間のシリ
ンダ孔では、摩擦パツドに対する押圧力が、デイ
スク回入及び回出側のシリンダ孔よりも小さくな
るので、制動反力が小さく抑えられ、しかも、中
間のシリンダ孔外周のボス部が肉盛りやリブによ
つて補強されるので、キヤリパの中間部の剛性が
増し、制動による撓みが抑止される。 With this configuration, the pressing force against the friction pad in the small-diameter intermediate cylinder hole is smaller than that in the cylinder holes on the disc rotation and rotation sides, so the braking reaction force is suppressed to a small level. Since the boss portion on the outer periphery of the hole is reinforced by padding and ribs, the rigidity of the intermediate portion of the caliper is increased and deflection due to braking is suppressed.

〔Example〕

以下、本考案の第１実施例を第１図及び第２図
に基づいて説明する。 Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 and 2.

デイスクブレーキ１は、デイスクロータ２の外
周で分割された一対のキヤリパ半体３ａ，３ｂの
デイスク回入及び回出側を、夫々２本の締結ボル
ト４で連結してキヤリパ３を構成し、デイスクロ
ータ２の両側に配置される両作用部３ｃ，３ｄ
に、口径の異なるシリンダ孔５，７，６をデイス
ク回入側からデイスク回出側に亘つてデイスク周
方向に相対向して設け、これらシリンダ孔５，
７，６に、コツプ型のピストン８，１０，９を、
夫々液密且つ移動可能に内挿した６ポツトのピス
トン対向型で、前記キヤリパ３は、一方のキヤリ
パ半体３ａに延設されたブラケツト３ｅ，３ｆを
車体にボルト止めして固定される。 In the disc brake 1, a pair of caliper halves 3a and 3b, which are divided at the outer periphery of a disc rotor 2, are connected at the disc rotation and rotation sides with two fastening bolts 4, respectively, to form a caliper 3. Both acting parts 3c and 3d arranged on both sides of the rotor 2
, cylinder holes 5, 7, and 6 having different diameters are provided facing each other in the disk circumferential direction from the disk rotation side to the disk rotation side.
At 7, 6, put a small piston 8, 10, 9,
The caliper 3 is of a six-pot opposed piston type, each of which is fluid-tightly and movably inserted, and is fixed to the vehicle body by bolting brackets 3e and 3f extending from one caliper half 3a.

シリンダ孔５，７，６の底部には、前記ピスト
ン８，１０，９の内挿によつて、夫々液圧室１１
が画成される。これら液圧室１１は、同側の３つ
が通孔１２にて、また両側の３つづつが、デイス
ク回入側でデイスクロータ２の外周を跨ぐ連通孔
１３にて夫々連通され、さらにキヤリパ半体３ａ
のデイスク回出側のシリンダ孔６に画成される液
圧室１１は、インレツトポート１４と連通してい
る。 Hydraulic pressure chambers 11 are provided at the bottoms of the cylinder holes 5, 7, 6 by inserting the pistons 8, 10, 9, respectively.
is defined. Three of these hydraulic pressure chambers 11 on the same side communicate with each other through a communication hole 12, and three on both sides communicate with each other through a communication hole 13 that straddles the outer circumference of the disk rotor 2 on the disk rotation side. body 3a
A hydraulic chamber 11 defined in the cylinder hole 6 on the disk extraction side communicates with the inlet port 14.

デイスクロータ２と両作用部３ｃ，３ｄとの間
には、一対の摩擦パツド１５，１５が、ハンガー
ピン１６にてデイスク軸方向へ移動可能に吊持さ
れている。各摩擦パツド１５は、上部中央をハン
ガーピン１６に支持される裏板１５ａと、該裏板
１５ａの一側面に貼着されるライニング１５ｂと
からなつている。 A pair of friction pads 15, 15 are suspended between the disk rotor 2 and the working portions 3c, 3d by hanger pins 16 so as to be movable in the disk axial direction. Each friction pad 15 consists of a back plate 15a whose upper center is supported by a hanger pin 16, and a lining 15b stuck to one side of the back plate 15a.

前記インレツトポート１４は、図示しないブレ
ーキホースにて、公知の液圧マスタシリンダに連
結され、液圧マスタシリンダに発生した圧液が、
インレツトポート１４から各液圧室１１に供給さ
れると、ピストン８，１０，９が、夫々のシリン
ダ孔５，７，６を前進して、両摩擦パツド１５，
１５をデイスクロータ２方向に押動し、矢印Ａ方
向へ回転するデイスクロータ２の側面に、ライニ
ング１５ｂを押圧して制動作用を行なう。 The inlet port 14 is connected to a known hydraulic master cylinder through a brake hose (not shown), and the pressure fluid generated in the hydraulic master cylinder is
When the fluid is supplied from the inlet port 14 to each hydraulic pressure chamber 11, the pistons 8, 10, 9 move forward through the respective cylinder holes 5, 7, 6, and the friction pads 15,
15 is pushed in the direction of the disc rotor 2, and the lining 15b is pressed against the side surface of the disc rotor 2 rotating in the direction of arrow A to perform a braking action.

前記シリンダ孔５，７，６のうち、デイスク回
入及び回出側のシリンダ孔５，６は夫々中径及び
大径に、また中間のシリンダ孔７は小径に形成さ
れている。即ち、シリンダ孔５，６は、前述の締
結ボルト４に近接して配置され、しかもこの締結
ボルト４が螺着されるキヤリパ３の両側部が厚肉
に形成されるため、制動時の反力にも充分な剛性
を保持するのに対し、中間のシリンダ孔７では、
剛体部分から離れていて、デイスク回入及び回出
側のシリンダ孔５，６よりも剛性が劣ることか
ら、摩擦パツド１５への押圧力を小さく設定する
ことにより、シリンダ孔７が受ける反力が小さく
なるようにしている。 Among the cylinder holes 5, 7, 6, the cylinder holes 5, 6 on the disk insertion and rotation sides are formed to have a medium diameter and a large diameter, respectively, and the intermediate cylinder hole 7 is formed to have a small diameter. That is, the cylinder holes 5 and 6 are arranged close to the aforementioned fastening bolt 4, and both sides of the caliper 3 onto which the fastening bolt 4 is screwed are formed thick, so that the reaction force during braking is reduced. However, the middle cylinder hole 7 maintains sufficient rigidity.
Since the cylinder holes 5 and 6 are located away from the rigid body part and have lower rigidity than the cylinder holes 5 and 6 on the disk insertion and extraction sides, by setting the pressing force on the friction pad 15 small, the reaction force received by the cylinder hole 7 can be reduced. I'm trying to make it smaller.

またこれと同時に、中間のシリンダ孔７を囲繞
するボス部７ａの外周に、補強用肉盛りを施して
いる。即ち、中間のシリンダ孔７を囲繞するボス
部７ａの外周の肉厚t₃を、デイスク回入及び回出
側のシリンダ孔５，６のボス部５ａ，６ａの肉厚
t₁，t₂よりも厚く肉盛りして、制動反力に対する
シリンダ孔７周辺の剛性を高めている。このよう
にして、多数のポツトを対向して持つキヤリパ３
は、デイスク周方向に長く形成されるにも拘ら
ず、全体として充分な剛性を保持することとな
る。 At the same time, the outer periphery of the boss portion 7a surrounding the intermediate cylinder hole 7 is padded for reinforcement. That is, the wall thickness _t3 of the outer periphery of the boss portion 7a surrounding the intermediate cylinder hole 7 is the wall thickness of the boss portions 5a, 6a of the cylinder holes 5, 6 on the disk rotation and rotation sides.
The build-up is thicker than t ₁ and t ₂ to increase the rigidity around the cylinder hole 7 against braking reaction force. In this way, the caliper 3 with many pots facing each other
Although it is formed long in the circumferential direction of the disk, it maintains sufficient rigidity as a whole.

尚、本実施例の如きデイスクブレーキ１では、
通常、摩擦パツド１５のデイスク回入側にリーデ
イング作用が働くため、デイスク回入側のシリン
ダ孔５を、デイスク回出側のシリンダ孔６よりも
やや小さい中径に形成して、その押圧力を抑える
ことにより、摩擦パツド１５のデイスク回入側に
対する偏摩耗をも同時に抑止するようにしてい
る。 In addition, in the disc brake 1 like this embodiment,
Normally, a leading action acts on the disk retraction side of the friction pad 15, so the cylinder hole 5 on the disk retraction side is formed to have a slightly smaller diameter than the cylinder hole 6 on the disk retraction side to reduce the pressing force. By suppressing this, uneven wear of the friction pad 15 on the disk insertion side is also suppressed at the same time.

本実施例は上述のように、中間のシリンダ孔７
を、デイスク回入及び回出側のシリンダ孔５，７
よりも小径に形成し、さらにこのシリンダ孔７を
形成する外周を厚く肉盛りして補強したから、キ
ヤリパ３の中間部に剛性力が得られ、制動反力に
よる変形が抑止される。 In this embodiment, as described above, the middle cylinder hole 7
, the cylinder holes 5 and 7 on the disk insertion and extraction sides.
Since the caliper 3 is formed to have a smaller diameter, and the outer periphery forming the cylinder hole 7 is reinforced by thickening, rigidity is obtained in the middle part of the caliper 3, and deformation due to braking reaction force is suppressed.

したがつて、キヤリパ３の中間部の撓みによる
ライニング１５ｂの偏摩耗が防止され、さらに中
径に形成されたデイスク回入側のシリンダ孔５と
相俟つて、ライニング１５ｂの摩耗が一層均一化
されると共に、デイスクブレーキ１を操作するペ
ダルやレバーの操作フイーリングも、しつかりと
した剛性感となつて伝わり、手ごたえのある感じ
のよいものとなる。 Therefore, uneven wear of the lining 15b due to the bending of the intermediate portion of the caliper 3 is prevented, and in combination with the cylinder hole 5 on the disk insertion side formed to have a medium diameter, the wear of the lining 15b is made more uniform. At the same time, the operating feel of the pedals and levers that operate the disc brake 1 also conveys a firm and rigid feel, giving it a good and responsive feel.

第３図及び第４図は、本考案の第２実施例を示
す。 3 and 4 show a second embodiment of the invention.

本実施例では、シリンダ孔５，７，６とピスト
ン８，１０，９が、第１実施例と同様に構成され
るほか、ボス部５ａ，７ａ，６ａの肉厚t₁，t₃，
t₂は、全て同一の厚さで形成されている。 In this embodiment, the cylinder holes 5, 7, 6 and the pistons 8, 10, 9 are constructed in the same manner as in the first embodiment, and the wall thicknesses t ₁ , t ₃ of the boss portions 5a, 7a, 6a,
t ₂ are all formed with the same thickness.

キヤリパ半体３ａ，３ｂには、長手方向の略全
長に亘る２条のリブ２０ａ，２０ｂが、夫々前記
ボス部５ａ，７ａ，６ａの外面を繋ぐように突設
されている。 The caliper halves 3a, 3b are provided with two ribs 20a, 20b extending over substantially the entire length in the longitudinal direction so as to connect the outer surfaces of the boss portions 5a, 7a, 6a, respectively.

また、中間のシリンダ孔７を囲繞する外周のボ
ス部７ａと該中間のシリンダ孔７のボス部７ａに
隣接するデイスク回入及び回出側のシリンダ孔
５，６外周のボス部５ａ，６ａとの間のデイスク
外周側及びデイスク内周側部分に補強用隆起部２
０ｃを設けている。即ち、ボス部７ａのデイスク
回入及び回出側のデイスク外周側及びデイスク内
周側部分に４個の補強用隆起部２０ｃが突設され
ている。 Further, a boss portion 7a on the outer periphery surrounding the intermediate cylinder hole 7, and boss portions 5a, 6a on the outer periphery of the cylinder holes 5, 6 on the disk rotation and rotation sides adjacent to the boss portion 7a of the intermediate cylinder hole 7. There are reinforcing ridges 2 on the outer circumferential side of the disk and the inner circumferential side of the disk between
0c is provided. That is, four reinforcing protuberances 20c are protrudingly provided on the outer peripheral side of the disk and the inner peripheral side of the disk on the disk insertion and extraction sides of the boss portion 7a.

したがつて、これらボス部５ａ，７ａ，６ａ
は、リブ２０ａ，２０ｂにて補強されると共に、
殊に補強用隆起部２０ｃが、第１実施例の補強用
肉盛りに代わつて中間のシリンダ孔７のボス部７
ａを補強するので、制動反力による変形が抑止さ
れ、ライニング１５ｂの偏摩耗防止と制動フイー
リングの向上とが図られる。 Therefore, these boss portions 5a, 7a, 6a
is reinforced with ribs 20a and 20b, and
In particular, the reinforcing raised portion 20c is formed on the boss portion 7 of the intermediate cylinder hole 7 instead of the reinforcing padding in the first embodiment.
Since the lining 15b is reinforced, deformation due to braking reaction force is suppressed, and uneven wear of the lining 15b is prevented and the braking feeling is improved.

本実施例では、第１実施例のように中間のボス
部７ａを肉盛りしないので、中間のシリンダ孔７
を小径化した分の長さを短縮して、キヤリパ３を
コンパクトにすることができる。 In this embodiment, unlike the first embodiment, the intermediate boss portion 7a is not built up, so the intermediate cylinder hole 7a is not built up.
The caliper 3 can be made more compact by reducing the length of the caliper due to the smaller diameter.

第５図に示す第３実施例は、キヤリパ半体３
ａ，３ｂの一方に、口径の異なる４個のシリンダ
孔３０，３２，３３，３１をデイスク回入側から
デイスク回出側に亘つてデイスク周方向へ並べた
８ポツトのピストン対向型で、これらシリンダ孔
３０，３２，３３，３１には、夫々の口径に応じ
たピストン３４，３６，３７，３５が内挿され
る。 The third embodiment shown in FIG.
A, 3b is an 8-pot piston facing type in which four cylinder holes 30, 32, 33, 31 of different diameters are arranged in the disk circumferential direction from the disk rotation side to the disk rotation side. Pistons 34, 36, 37, 35 are inserted into the cylinder holes 30, 32, 33, 31 according to their respective diameters.

デイスク回入及び回出側のシリンダ孔３０，３
１は、夫々中径及び大径に形成され、その間に挟
まれる２つの中間のシリンダ孔３２，３３は、両
側のシリンダ孔３０，３１よりも夫々小径に形成
されており、両シリンダ孔３２，３３を形成する
図示しないボス部は、上記両実施例と同様に、肉
盛りや隆起部によつて補強される。 Cylinder holes 30, 3 on the disk rotation and rotation sides
1 is formed to have a medium diameter and a large diameter, respectively, and the two middle cylinder holes 32 and 33 sandwiched therebetween are formed to have a smaller diameter than the cylinder holes 30 and 31 on both sides, respectively. The boss portion (not shown) forming 33 is reinforced by a build-up or a raised portion, as in both of the above embodiments.

尚、上記実施例では、肉盛りと隆起部による補
強を個々に実施して説明したが、双方を同時に実
施しても差支えない。 In addition, in the above embodiment, the reinforcement by the build-up and the reinforcement by the raised portion were individually implemented and explained, but there is no problem even if both are implemented at the same time.

[Effect of idea]

上記各実施例で説明したように、本考案のピス
トン対向型キヤリパは、デイスク回入側からデイ
スク回出側に亘つてデイスク周方向に対向並設し
た３個以上のシリンダ孔のうち、デイスク回入及
び回出側のシリンダ孔に挟まれた中間のシリンダ
孔を、デイスク回入及び回出側のシリンダ孔より
も小径に形成すると共に、中間のシリンダ孔を囲
繞するボス部の外周に、補強用肉盛りを施すか、
あるいは中間のシリンダ孔を囲繞するボス部と該
中間のシリンダ孔のボス部に隣接する他のシリン
ダ孔のボス部との間のデイスク外周側及びデイス
ク内周側部分に補強用隆起部を設けるか、また
は、前記補強用肉盛りと前記補強用隆起部を設け
たので、キヤリパの中間部に、デイスク回入及び
回出側と同様の剛性力が得られ、制動反力による
変形が抑止される。これにより、摩擦パツドの偏
摩耗が防止されると共に、制動フイーリングも、
運転者にしつかりとした剛性感となつて伝わり、
手ごたえのある感じのよいものとなる。 As explained in each of the above embodiments, the piston-opposed caliper of the present invention has three or more cylinder holes arranged in parallel in the circumferential direction of the disk from the disk rotation side to the disk rotation side. The intermediate cylinder hole sandwiched between the cylinder holes on the input and output sides is formed to have a smaller diameter than the cylinder holes on the disk input and output sides, and the outer periphery of the boss surrounding the intermediate cylinder hole is reinforced. Add meat to the meat or
Alternatively, reinforcing protuberances may be provided on the outer circumferential side of the disk and the inner circumferential side of the disk between the boss portion surrounding the intermediate cylinder hole and the boss portion of another cylinder hole adjacent to the boss portion of the intermediate cylinder hole. Or, since the reinforcing build-up and the reinforcing protrusion are provided, the same rigidity as on the disc rotation and rotation sides is obtained at the intermediate portion of the caliper, and deformation due to braking reaction force is suppressed. . This prevents uneven wear of the friction pads and also improves the braking feeling.
It conveys a solid feeling to the driver,
It will give you a good feel and feel.

[Brief explanation of drawings]

第１図及び第２図は本考案の第１実施例を示
し、第１図はデイスクブレーキの一部切欠き正面
図、第２図は同じく一部切欠き平面図、第３図及
び第４図は第２実施例を示し、第３図はデイスク
ブレーキの正面図、第４図は第３図の−断面
図、第５図は第３実施例を示すデイスクブレーキ
の断面正面図である。１……デイスクブレーキ、２……デイスクロー
タ、３……キヤリパ、３ａ，３ｂ……キヤリパ半
体、３ｃ，３ｄ……作用部、４……締結ボルト、
５，６，７，３０，３１，３２，３３……シリン
ダ孔、５ａ，６ａ，７ａ……ボス部、８，９，１
０，３４，３５，３６，３７……ピストン、１５
……摩擦パツド、２０ｃ……補強用隆起部、Ａ…
…デイスクロータ２の回転方向、t₁……ボス部５
ａの肉厚、t₂……ボス部６ａの肉厚、t₃……ボス
部７ａの肉厚。 1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of a disc brake, FIG. 2 is a partially cutaway plan view, and FIGS. The drawings show a second embodiment, FIG. 3 is a front view of the disc brake, FIG. 4 is a cross-sectional view taken at - 3 in FIG. 3, and FIG. 5 is a sectional front view of the disc brake showing the third embodiment. 1... Disc brake, 2... Disc rotor, 3... Caliper, 3a, 3b... Caliper half, 3c, 3d... Working part, 4... Fastening bolt,
5, 6, 7, 30, 31, 32, 33... Cylinder hole, 5a, 6a, 7a... Boss part, 8, 9, 1
0, 34, 35, 36, 37...Piston, 15
...Friction pad, 20c...Reinforcement ridge, A...
...Rotation direction of disc rotor 2, t ₁ ...Boss part 5
Thickness of a, t ₂ ... Thickness of boss portion 6a, t ₃ ... Thickness of boss portion 7a.

Claims

[Claims for Utility Model Registration] (1) A piston that presses a pair of friction pads against the disc rotor is inserted into each of the acting parts that are arranged to sandwich a pair of friction pads facing each other on both sides of the disc rotor. In a piston-opposed caliper for a vehicle disc brake, in which three or more cylinder holes are arranged in parallel in the disk circumferential direction from the disk rotation side to the disk rotation side, of the plurality of cylinder holes, one A piston for a disc brake for a vehicle, characterized in that an intermediate cylinder hole is formed to have a smaller diameter than a cylinder hole on the retraction side, and a reinforcing padding is applied to the outer periphery of a boss portion surrounding the intermediate cylinder hole. Opposed type caliper. (2) A disk with three or more cylinder holes into which pistons for pressing the friction pads against the disk rotor are inserted, respectively, in both acting parts that are arranged across a pair of friction pads arranged oppositely on both sides of the disk rotor. In a piston-opposed caliper of a vehicle disc brake that is arranged in parallel in the disk circumferential direction from the rotation side to the disk rotation side, the cylinder holes on the disk rotation and rotation sides are larger than those on the disk rotation and rotation sides among the plurality of cylinder holes. The intermediate cylinder hole is formed to have a small diameter, and the outer circumferential side of the disk and the inner circumference of the disk are formed between the boss portion surrounding the intermediate cylinder hole and the boss portion of another cylinder hole adjacent to the boss portion of the intermediate cylinder hole. A piston-opposed caliper for a vehicle disc brake, characterized by having a reinforcing bulge on the side portion. (3) A disk with three or more cylinder holes into which pistons for pressing the friction pads against the disk rotor are inserted, respectively, in both acting parts which are arranged sandwiching a pair of friction pads arranged oppositely on both sides of the disk rotor. In a piston-opposed caliper of a vehicle disc brake that is arranged in parallel in the disk circumferential direction from the rotation side to the disk rotation side, the cylinder holes on the disk rotation and rotation sides are larger than those on the disk rotation and rotation sides among the plurality of cylinder holes. The intermediate cylinder hole is formed to have a small diameter, and the outer periphery of the boss surrounding the intermediate cylinder hole is provided with reinforcement padding, and the boss surrounding the intermediate cylinder hole and the boss of the intermediate cylinder hole are A piston-opposed caliper for a vehicle disc brake, characterized in that reinforcing protuberances are provided on the outer peripheral side of the disk and the inner peripheral side of the disk between the boss portion of another adjacent cylinder hole.