JP3882102B2 - Brake piece wear detection probe - Google Patents

Brake piece wear detection probe Download PDF

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Publication number
JP3882102B2
JP3882102B2 JP28286598A JP28286598A JP3882102B2 JP 3882102 B2 JP3882102 B2 JP 3882102B2 JP 28286598 A JP28286598 A JP 28286598A JP 28286598 A JP28286598 A JP 28286598A JP 3882102 B2 JP3882102 B2 JP 3882102B2
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Japan
Prior art keywords
electric wire
detection
holding member
holder
detection electric
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JP28286598A
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Japanese (ja)
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JP2000110871A (en
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昌樹 岡本
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Sumitomo Wiring Systems Ltd
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Sumitomo Wiring Systems Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、制動片の摩耗検知プローブに関する。
【0002】
【従来の技術】
特開平10−2363号公報には、自動車のブレーキパッドの摩耗程度が使用限界に達したことを検知する摩耗検知プローブが開示されている。その摩耗検知プローブは、U字状に折り返された電線と、その電線の折り返し部を先端面に露出させた状態で保持する保持部材とを備えて構成されている。そして、この摩耗検知プローブは折り返し部をディスクロータに向けた姿勢でブレーキパッド内に埋め込まれる。これにより、ブレーキパッドの摩耗が進むといずれ摩耗検知プローブがパッド面に露出し、さらに摩耗が進むとブレーキパッドと同時に電線の折り返し部も摩耗し始め、ブレーキパッドの摩耗が使用限界位置まで達すると電線は断線する。そして、断線検出回路によってそのことが検知され、ブレーキパッドの摩耗程度が使用限界に達したことを知らせる警告ランプが点灯する。
【0003】
この摩耗検知プローブでは、検知用電線を保持部材に取り付ける手段として、保持部材に前後方向に直線状に貫通する2本の貫通孔を形成し、この両貫通孔に2つ折りにした検知用電線を前方から挿通させて保持部の後方へ突出させ、その突出部分が摩耗検知回路に接続される。
【0004】
【発明が解決しようとする課題】
走行中、ディスクロータは高速で回転し、このディスクロータが検知用電線の折り返し部に接触すると、折り返し部には急激に強い摩擦抵抗が作用し、その結果折り返し部が前方へ強く引っ張られることになる。もし、検知用電線が前方へ変位すると、検知用電線がホルダの前方へ延びて垂れ下がったり、ホルダの後方で検知用電線が断線したりするおそれがあり、このようになると正常な摩耗検知機能が失われてしまうことになる。したがって、折り返し部に前方への強い引張り力が作用したときに検知用電線が前方へ移動することを防止するための手段が要望されている。
【0005】
本願発明は上記事情に鑑みて創案されたものであって、検知用電線の位置ずれを防止することを目的とするものである。
【0006】
【課題を解決するための手段】
請求項1の発明は、ホルダに対し、その前端で折り返して2本の挿通孔に通して後方へ延出させるように検知用電線を組み付けて構成されるとともに、ロータとの接触を可能とされた制動片に対し、前記検知用電線の折り返し部を前記ロータに対向させるように設けられ、その制動片の摩耗程度が使用限界に達したか否かを前記検知用電線の前記折り返し部における断線の有無によって検出するものであって、前記検知用電線のうち一方の前記挿通孔に挿通されている部分を前方からの引張りに抗する引っ掛かりを生じるように曲げた状態で保持する保持部材を備えており、前記ホルダには、前記保持部材を前方移動規制状態に取付け可能な嵌合部が形成され、前記保持部材が前記嵌合部に取り付けられた状態では、前記検知用電線が前記保持部材と前記ホルダとの間で挟み付けられるようになっているとともに、前記嵌合部に前記保持部材を取り付けることで、前記検知用電線における前記保持部材への保持部分の前記ホルダに対する前方への変位が規制され、前記検知用電線の折返部において前記保持部材側の挿通孔から反対側の挿通孔に向かう方向が、車両が前進する際の前記ロータの回転方向と同じ向きとなっている構成とした。
【0007】
請求項2の発明は、請求項1の発明において、前記保持部材には、前記検知用電線を巻き付けさせることによりその検知用電線を保持する巻き付け部が形成されている構成とした。
【0008】
請求項3の発明は、請求項1又は請求項2の発明において、前記検知用電線が挟み付けられる領域における前記保持部材と前記ホルダのうちの少なくとも一方には、前記検知用電線の外周に食い込んでその変位を規制する規制部が形成されている構成とした。
【0009】
【発明の作用及び効果】
[請求項1の発明]
保持部材を嵌合部に取り付けると、保持部材はホルダに対して前方への変位を規制され、この保持部材に対し検知用電線はその曲げ部分における引っ掛かり作用により前方への変位を規制される。これにより、検知用電線の折り返し部にロータが接触して強い引張力が作用しても、検知用電線の前方への位置ずれが確実に防止される。
また、保持部材を嵌合部に取り付けると、検知用電線が保持部材とホルダとの間で挟み付けられることにより、検知用電線の前方への変位規制機能が高められる。
【0010】
[請求項2の発明]
検知用電線は保持部材の巻き付け部に巻き付けられているので、検知用電線には前方へ折り返される部分と後方へ折り返される部分とが形成され、この両折返部分により、前方への引張りに抗する有効な引っ掛かり作用が機能し、もって検知用電線を確実に変位規制することができる。
【0011】
請求項3の発明
検知用電線の外周に規制部が食い込むことによって検知用電線が変位規制されるので、検知用電線の前方への変位防止機能がさらに向上する。
【0012】
【発明の実施の形態】
[実施形態1]
以下、本発明を具体化した実施形態1を図1乃至図4を参照して説明する。
【0013】
本実施形態の摩耗検知プローブPは、車輪と一体回転する円盤状のロータRを一対のブレーキライニング材B(本発明の構成要件である制動片)で挟み付けることによってブレーキングを行う周知の車両用ディスクブレーキ装置に適用されるものであり、ホルダ10と検知用電線20と保持部材30とからなる。ホルダ10にはその前後両端面の間を貫通する2本の挿通孔11が形成され、ホルダ10の前端面でU字形に折り返された検知用電線20が挿通され、そのホルダ10の後端面から引き出された部分は図示しない断線検出回路に接続されている。
【0014】
かかる摩耗検知プローブPは、ブレーキライニング材Bが固定されている支持部材Sの取付孔Hに固定され、ホルダ10の前端面における検知用電線20の折り返し部21は、ロータRと対向する状態でブレーキライニング材Bの窓孔W内に位置している。通常のブレーキングでは摩耗検知プローブPはロータRと接触しないが、ブレーキライニング材Bの摩耗が進んでその厚さが所定の寸法まで薄くなると、検知用電線20の折り返し部21が摩滅し、やがて断線することになる。検知用電線20の断線が断線検出回路で検知されると、ブレーキライニング材Bの摩耗が使用限界に達したことを知らせる警告ランプ(図示せず)が点灯するようになっている。
【0015】
次に、ホルダ10に対する検知用電線20の位置ずれを防止する手段について説明する。ホルダ10の後部には、その後端面に方形状に開口するように凹ませた嵌合部12が形成されている。この嵌合部12の一方(図3及び図4における右側)の内壁面には、挿通孔11に連なる半円弧形断面の第1電線押さえ溝13Aと、この第1電線押さえ溝13Aに隣接する第2電線押さえ溝13Bとが形成されているとともに、この両電線押さえ溝13A,13Bと対向する内側面(図3及び図4における左側の内壁面)には挿通孔11に連なる第3電線押さえ溝13Cが形成されている。また、嵌合部12の奥端面のうち第1及び第2の電線押さえ溝13A,13Bと隣り合う領域は受け面14とされているとともに、第3電線押さえ溝13Cと隣り合う領域は、受け面14に対して段差状に奥行きを浅くしたストッパ面15とされている。受け面14は、保持部材30に取り付けられた検知用電線20の一部を当接させるようにしたものであって、この受け面14には、その検知用電線20の当接部分の樹脂被覆に食い込み可能な鋸歯状をなす規制部14Aが形成されている。この規制部14Aが検知用電線20の食い込むことにより、その検知用電線20の軸線方向(図3及び図4における左右方向)への変位が規制されるようになっている。
【0016】
保持部材30は、検知用電線20を前方変位を規制するように保持するためのものであり、全体として略サイコロ状をなし、上記嵌合部12に圧入されるようになっている。保持部材30の一方の外壁面には、上記第1電線押さえ溝13A及び第2電線押さえ溝13Bと対応する半円弧形断面の第1電線保持溝31Aと第2電線保持溝31Bが形成されているとともに、他方の外壁面には第3電線押さえ溝13Cと対応する第3電線保持溝31Cが形成されている。保持部材30が嵌合部12に圧入されると、電線保持溝31A,31B,31Cと電線押さえ溝13A,13B,13Cとの間で検知用電線20が挟み込まれて遊動不能に保持される。即ち、電線保持溝31A,31B,31Cと電線押さえ溝13A,13B,13Cによって形成される孔の内径は検知用電線20の外径よりも少し小さく設定されている。さらに、保持部材30にはその前後両端面間に貫通する電線保持孔32が形成されている。また、保持部材30において電線保持孔32と第1及び第2電線保持溝31A,31Bとの間の部分は、検知用電線20を巻き付けるための巻き付け部33とされている。また、保持部材30をストッパ面15に突き当てた状態では、保持部材30の巻き付け部33の前端面33Aと上記受け面14との間隔は、検知用電線20の外径よりも少し小さい寸法に設定されている。
【0017】
次に、本実施形態の作用を説明する。
摩耗検知プローブPの組付けに際しては、まず、検知用電線20を保持部材30の電線保持孔32に貫通させて第1と第2の電線保持溝31A,31Bに嵌めつつ巻き付け部33に一回巻き付け、検知用電線20の第1電線保持溝31Aから延長した部分をホルダ10の一方の挿通孔11に後方から挿通する(図2を参照)。
この後、ホルダ10の前方で検知用電線20を折り返し、空いている挿通孔11に通すとともに、第3電線押さえ溝13Cに嵌めてホルダ10の後端へ延出させ、その延出部分を後方へ引っ張りつつ保持部材30を嵌合部12に圧入する。このとき、検知用電線20の第1電線保持溝31A、第2電線保持溝31B、第3電線押さえ溝13Cに嵌められている部分は、夫々、第1電線押さえ溝13A、第2電線押さえ溝13B、第3電線保持溝31Cに嵌めるようにする。また、両挿通孔11、ホルダ10の前端及び保持部材30において検知用電線20が弛まないようにする。保持部材30をストッパ面15に突き当たるまで圧入すれば、ホルダ10に対する検知用電線20と保持部材30の組付けが完了する。
【0018】
この状態では、保持部材30に巻き付けた検知用電線20の一部が保持部材30の巻き付け部33の前端面33Aと嵌合部12の受け面14との間で押し潰された状態で挟み付けられるとともに、その挟み付けられた部分の樹脂被覆に規制部14Aが食い込む。これにより、検知用電線20の軸方向への変位が規制される。また、第1〜第3の電線保持溝31A,31B,31Cと第1〜第3の電線押さえ溝13A,13B,13Cとの間でも検知用電線20が挟み付けられた状態となるため、摩擦により検知用電線20の軸方向の変位が規制されている。
【0019】
組み付けられた摩耗検知プローブPは支持部材Sの取付孔Hに固定されるが、このときに、検知用電線20の折り返し部21において保持部材30側の挿通孔11から反対側の挿通孔11に向かう方向が、車両が前進する際のロータRの回転方向(図1に下向きの矢線で示す)と同じ向きとなるようにする。
ブレーキライニング材Bの摩耗が進んで検知用電線20の折り返し部21がロータRに接触するようになると、前進走行中に接触した時に検知用電線20とロータRとの間で瞬間的に大きな摩擦抵抗が発生し、そのために検知用電線20には前方(ロータR側)からの引張力が作用する。このときに、検知用電線20が前方へ変位すると、検知用電線20がホルダ10の前方へ延びて垂れ下がったり、ホルダ10の後方で検知用電線20が断線したりするおそれがあり、このようになると正常な摩耗検知機能が失われてしまうことになる。
【0020】
ところが、本実施形態では、ホルダ10の嵌合部12に保持部材30を前方変位を規制した状態に嵌合し、その保持部材30に検知用電線20を巻き付けて保持している。したがって、検知用電線20に前方への引張力が作用しても、検知用電線20はその保持部材30の巻き付け部33の後端と前端においてU字形に折り返されている部分で引っ掛かりを生じ、これにより、検知用電線20の保持部材30に対する前方への位置ずれ、ひいてはホルダ10に対する前方への変位が防止されている。
【0021】
しかも、検知用電線20には、その樹脂被覆に鋸歯状の規制部14Aが食い込むことによって強い引っ掛かり作用が働くとともに、電線保持溝31A,31B,31Cと電線押さえ溝13A,13B,13Cとの間で挟み付けられることによる保持力も働くので、検知用電線20の軸方向、ひいては前方向への変位規制機能がより高められている。
さらに、保持部材30がストッパ面15との間に隙間を残した状態で嵌合されていたとしても、検知用電線20に前方からの引張力が作用したときに、その引張力により保持部材30が前方へ移動して巻き付け部33の前端面33Aが検知用電線20を受け面14側へ押し付けるようになるので、検知用電線20に対する保持力が低下するおそれはない。
【0022】
[他の実施形態]
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施態様も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
(1)上記実施形態では保持部材に電線保持孔を設け、検知用電線をこの電線保持孔に通して巻き付けるようにしたが、本発明によれば、電線保持孔を設けずに、単に保持部材の外周に粗って検知用電線を巻き付けるようにしてもよい。
【0023】
(2)上記実施形態では検知用電線を保持部材にまきつけるようにして保持したが、本発明によれば、保持部材の外面に葛折状やU字形などの屈曲した溝を形成してここに検知用電線を嵌め込んで保持するようにしてよい。
(3)上記実施形態では保持部材を嵌合部に収容したときに検知用電線が保持部材と嵌合部の内面との間で挟み付けられるようにしたが、本発明によれば、保持部材と嵌合部との間での挟み付け構造を採用せず、単に保持部材と検知用電線との引っ掛かり作用だけで変位規制を行うようにしてもよい。
【0024】
(4)上記実施形態では検知用電線の外周に食い込む規制部を嵌合部の受け面のみに設けたが、本発明によれば、規制部を保持部材のみに設けてもよく、嵌合部と保持部材の双方に設けてもよく、あるいは、このような規制部を設けない構成としてもよい。
(5)上記実施形態では嵌合部をキャビティ状にしてそこに保持部材を収容するようにしたが、本発明によれば、保持部材がホルダの外面に露出する形態で取り付けられるようにしてもよい。
【0025】
(6)上記実施形態ではディスクブレーキ用の摩耗検知プローブに適用した場合について説明したが、本発明は、ドラムブレーキ用の摩耗検知プローブにも適用することができる。
【図面の簡単な説明】
【図1】実施形態1の断面図
【図2】組付け前の状態を示す断面図
【図3】保持部材の取付部分の部分拡大断面図
【図4】背面図
【符号の説明】
R…ロータ
B…ブレーキライニング材(制動片)
P…摩耗検知プローブ
10…ホルダ
12…嵌合部
14…受け面
14A…規制部
20…検知用電線
21…折り返し部
30…保持部材
33…巻き付け部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake piece wear detection probe.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 10-2363 discloses a wear detection probe for detecting that the degree of wear of a brake pad of an automobile has reached the use limit. The wear detection probe is configured to include an electric wire folded in a U shape and a holding member that holds the folded portion of the electric wire in a state where the folded portion is exposed on the distal end surface. The wear detection probe is embedded in the brake pad with the folded portion facing the disc rotor. As a result, when the wear of the brake pad progresses, the wear detection probe will eventually be exposed to the pad surface, and when the wear further progresses, the folded portion of the electric wire starts to wear simultaneously with the brake pad, and the wear of the brake pad reaches the use limit position. Wires are disconnected. This is detected by the disconnection detection circuit, and a warning lamp is lit to notify that the wear level of the brake pad has reached the use limit.
[0003]
In this wear detection probe, as a means for attaching the detection wire to the holding member, the holding member is formed with two through holes penetrating in a straight line in the front-rear direction, and the detection wire folded in both through holes is provided. The protrusion is inserted from the front and protrudes backward from the holding portion, and the protrusion is connected to the wear detection circuit.
[0004]
[Problems to be solved by the invention]
During traveling, the disk rotor rotates at a high speed, and when this disk rotor contacts the folded portion of the detection electric wire, a strong frictional resistance acts on the folded portion, and as a result, the folded portion is strongly pulled forward. Become. If the detection wire is displaced forward, the detection wire may extend forward and hang down from the holder, or the detection wire may break behind the holder. It will be lost. Therefore, there is a demand for a means for preventing the detection electric wire from moving forward when a strong tensile force is applied to the folded portion.
[0005]
The present invention has been invented in view of the above circumstances, and aims to prevent the displacement of the detection electric wire.
[0006]
[Means for Solving the Problems]
The invention of claim 1 is configured by assembling a detection electric wire so that the holder is folded back at the front end thereof , passed through the two insertion holes and extended backward, and can be brought into contact with the rotor. For the brake piece, the return portion of the detection wire is provided so as to face the rotor, and whether the wear level of the brake piece has reached the use limit or not is broken in the return portion of the detection wire. And a holding member that holds the portion of the detection wire that is inserted through one of the insertion holes in a bent state so as to resist a pull from the front. in which, in the holder, the fitting portion attachable to the holding member in the forward movement restricted state is formed, in the state in which the holding member is attached to the fitting portion, the detection wire is the coercive Together it is adapted to be clamped between said the member holders, by attaching the holding member to the fitting portion, forward with respect to the holder holding portion to the holding member in the detection wire The displacement is restricted, and the direction from the insertion hole on the holding member side to the insertion hole on the opposite side is the same direction as the rotation direction of the rotor when the vehicle moves forward in the folded portion of the detection electric wire It was.
[0007]
According to a second aspect of the present invention, in the first aspect of the invention, the holding member is formed with a winding portion for holding the detection electric wire by winding the detection electric wire.
[0008]
According to a third aspect of the present invention , in the first or second aspect of the present invention , at least one of the holding member and the holder in a region where the detection electric wire is sandwiched bites into an outer periphery of the detection electric wire. Thus, a configuration is provided in which a restricting portion for restricting the displacement is formed.
[0009]
[Action and effect of the invention]
[Invention of Claim 1]
When the holding member is attached to the fitting portion, the holding member is restricted from moving forward with respect to the holder, and the detecting wire is restricted from moving forward by the hooking action at the bent portion of the holding member. Thereby, even if a rotor contacts the folding | returning part of a detection electric wire and a strong tensile force acts, the position shift to the front of a detection electric wire is prevented reliably.
Further, when the holding member is attached to the fitting portion, the detection electric wire is sandwiched between the holding member and the holder, so that a function of restricting the forward displacement of the detection electric wire is enhanced.
[0010]
[Invention of claim 2]
Since the detection electric wire is wound around the winding portion of the holding member, the detection electric wire is formed with a portion that is folded forward and a portion that is folded backward, and both the folded portions resist the pulling forward. An effective hooking function functions, so that the displacement of the detection electric wire can be reliably controlled.
[0011]
[ Invention of claim 3 ]
Since the displacement of the detection wire is restricted by the restriction portion biting into the outer periphery of the detection wire, the function of preventing the forward displacement of the detection wire is further improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
A first embodiment of the present invention will be described below with reference to FIGS.
[0013]
The wear detection probe P of the present embodiment is a well-known vehicle that performs braking by sandwiching a disk-shaped rotor R that rotates integrally with a wheel with a pair of brake lining materials B (braking pieces that are constituent elements of the present invention). This is applied to a disc brake device for use, and comprises a holder 10, a detection electric wire 20, and a holding member 30. The holder 10 is formed with two insertion holes 11 penetrating between both front and rear end faces thereof, and the detection electric wire 20 folded back in a U shape on the front end face of the holder 10 is inserted from the rear end face of the holder 10. The drawn portion is connected to a disconnection detection circuit (not shown).
[0014]
The wear detection probe P is fixed to the mounting hole H of the support member S to which the brake lining material B is fixed, and the folded portion 21 of the detection electric wire 20 on the front end surface of the holder 10 faces the rotor R. It is located in the window hole W of the brake lining material B. In normal braking, the wear detection probe P does not come into contact with the rotor R. However, when the wear of the brake lining material B advances and the thickness of the brake lining material B is reduced to a predetermined dimension, the folded portion 21 of the detection electric wire 20 is worn away. It will be disconnected. When the disconnection of the detection electric wire 20 is detected by the disconnection detection circuit, a warning lamp (not shown) for notifying that the wear of the brake lining material B has reached the use limit is turned on.
[0015]
Next, a means for preventing the displacement of the detection wire 20 with respect to the holder 10 will be described. A fitting portion 12 is formed at the rear portion of the holder 10 so as to be recessed in the rear end face so as to open in a square shape. On one inner wall surface (right side in FIGS. 3 and 4) of the fitting portion 12, a first electric wire pressing groove 13 </ b> A having a semicircular cross section continuous with the insertion hole 11 and adjacent to the first electric wire pressing groove 13 </ b> A are provided. And a second electric wire holding groove 13B formed on the inner side surface (the left inner wall surface in FIGS. 3 and 4) facing the both electric wire holding grooves 13A and 13B. A holding groove 13C is formed. Moreover, while the area | region adjacent to 1st and 2nd electric wire pressing groove 13A, 13B among the back end surfaces of the fitting part 12 is made into the receiving surface 14, the area | region adjacent to the 3rd electric wire pressing groove 13C is received. The stopper surface 15 has a stepped depth with respect to the surface 14. The receiving surface 14 is configured to abut a part of the detection electric wire 20 attached to the holding member 30, and the receiving surface 14 has a resin coating on a contact portion of the detection electric wire 20. A restricting portion 14 </ b> A having a sawtooth shape that can bite into is formed. When the restricting portion 14A bites in the detection electric wire 20, the displacement of the detection electric wire 20 in the axial direction (left and right direction in FIGS. 3 and 4) is restricted.
[0016]
The holding member 30 is for holding the detection electric wire 20 so as to restrict the forward displacement, has a substantially dice shape as a whole, and is press-fitted into the fitting portion 12. A first electric wire holding groove 31A and a second electric wire holding groove 31B having a semicircular cross section corresponding to the first electric wire holding groove 13A and the second electric wire holding groove 13B are formed on one outer wall surface of the holding member 30. In addition, a third electric wire holding groove 31C corresponding to the third electric wire pressing groove 13C is formed on the other outer wall surface. When the holding member 30 is press-fitted into the fitting portion 12, the detection electric wire 20 is sandwiched between the electric wire holding grooves 31A, 31B, and 31C and the electric wire holding grooves 13A, 13B, and 13C, and is held non-movable. That is, the inner diameter of the hole formed by the electric wire holding grooves 31A, 31B, 31C and the electric wire holding grooves 13A, 13B, 13C is set slightly smaller than the outer diameter of the detection electric wire 20. Further, the holding member 30 is formed with an electric wire holding hole 32 penetrating between both front and rear end faces. Further, a portion of the holding member 30 between the wire holding hole 32 and the first and second wire holding grooves 31 </ b> A and 31 </ b> B serves as a winding portion 33 for winding the detection wire 20. Further, in the state where the holding member 30 is abutted against the stopper surface 15, the distance between the front end surface 33 </ b> A of the winding portion 33 of the holding member 30 and the receiving surface 14 is slightly smaller than the outer diameter of the detection wire 20. Is set.
[0017]
Next, the operation of this embodiment will be described.
When assembling the wear detection probe P, first, the detection electric wire 20 is passed through the electric wire holding hole 32 of the holding member 30 and fitted into the first and second electric wire holding grooves 31A and 31B, once in the winding portion 33. The part extended from the 1st electric wire holding groove | channel 31A of winding and the detection electric wire 20 is penetrated from the back to the one insertion hole 11 of the holder 10 (refer FIG. 2).
Thereafter, the detection electric wire 20 is folded back in front of the holder 10 and passed through the vacant insertion hole 11, and fitted into the third electric wire pressing groove 13C to extend to the rear end of the holder 10, and the extended portion is rearward. The holding member 30 is press-fitted into the fitting portion 12 while being pulled in. At this time, the portions fitted in the first wire holding groove 31A, the second wire holding groove 31B, and the third wire holding groove 13C of the detection wire 20 are the first wire holding groove 13A and the second wire holding groove, respectively. 13B, so as to fit in the third electric wire holding groove 31C. Further, the detection electric wires 20 are not loosened at the insertion holes 11, the front end of the holder 10 and the holding member 30. When the holding member 30 is press-fitted until it hits the stopper surface 15, the assembly of the detection wire 20 and the holding member 30 to the holder 10 is completed.
[0018]
In this state, a part of the detection electric wire 20 wound around the holding member 30 is sandwiched between the front end surface 33A of the winding portion 33 of the holding member 30 and the receiving surface 14 of the fitting portion 12. At the same time, the restricting portion 14A bites into the resin coating of the sandwiched portion. Thereby, the displacement to the axial direction of the electric wire 20 for a detection is controlled. In addition, since the detection electric wire 20 is sandwiched between the first to third electric wire holding grooves 31A, 31B, 31C and the first to third electric wire holding grooves 13A, 13B, 13C, friction is caused. This restricts the axial displacement of the detection wire 20.
[0019]
The assembled wear detection probe P is fixed to the mounting hole H of the support member S. At this time, in the folded portion 21 of the detection electric wire 20, the insertion hole 11 on the holding member 30 side is changed to the insertion hole 11 on the opposite side. The heading direction is set to be the same direction as the rotation direction of the rotor R when the vehicle moves forward (indicated by a downward arrow in FIG. 1).
When wear of the brake lining material B advances and the folded portion 21 of the detection electric wire 20 comes into contact with the rotor R, a large amount of friction is instantaneously generated between the detection electric wire 20 and the rotor R when contact is made during forward running. Resistance is generated, so that a tensile force from the front (rotor R side) acts on the detection electric wire 20. At this time, if the detection electric wire 20 is displaced forward, the detection electric wire 20 may extend to the front of the holder 10 and hang down, or the detection electric wire 20 may be disconnected behind the holder 10. Then, the normal wear detection function will be lost.
[0020]
However, in this embodiment, the holding member 30 is fitted to the fitting portion 12 of the holder 10 in a state in which the forward displacement is restricted, and the detection electric wire 20 is wound around the holding member 30 and held. Therefore, even if a forward tensile force acts on the detection electric wire 20, the detection electric wire 20 is caught at a portion folded back in a U shape at the rear end and the front end of the winding portion 33 of the holding member 30, Thereby, the position shift of the electric wire 20 for detection with respect to the holding member 30 to the front, and hence the forward displacement with respect to the holder 10 are prevented.
[0021]
In addition, the detection wire 20 has a strong hooking action due to the serrated regulation portion 14A biting into the resin coating, and between the wire holding grooves 31A, 31B, 31C and the wire holding grooves 13A, 13B, 13C. Since the holding force due to being sandwiched between them also works, the function of regulating the displacement of the detection electric wire 20 in the axial direction and thus in the forward direction is further enhanced.
Further, even when the holding member 30 is fitted with a gap between the holding member 30 and the stopper surface 15, when a tensile force from the front acts on the detection electric wire 20, the holding member 30 is caused by the tensile force. Moves forward and the front end surface 33A of the winding portion 33 presses the detection electric wire 20 toward the receiving surface 14 side, so that the holding force for the detection electric wire 20 is not reduced.
[0022]
[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the holding member is provided with the electric wire holding hole, and the detection electric wire is wound through the electric wire holding hole. However, according to the present invention, the holding member is simply provided without providing the electric wire holding hole. The wire for detection may be wound around the outer periphery of the wire.
[0023]
(2) In the above embodiment, the detection electric wire is held by being attached to the holding member. However, according to the present invention, a bent groove such as a distorted shape or a U-shape is formed on the outer surface of the holding member. You may make it hold | maintain by inserting the electric wire for a detection.
(3) In the above embodiment, when the holding member is accommodated in the fitting portion, the detection electric wire is sandwiched between the holding member and the inner surface of the fitting portion. Instead of adopting a sandwiching structure between the holding member and the fitting portion, the displacement restriction may be performed only by the hooking action between the holding member and the detection electric wire.
[0024]
(4) In the above embodiment, the restricting portion that bites into the outer periphery of the detection wire is provided only on the receiving surface of the fitting portion. However, according to the present invention, the restricting portion may be provided only on the holding member. And the holding member may be provided, or such a restriction portion may not be provided.
(5) In the above embodiment, the fitting portion is formed in a cavity shape and the holding member is accommodated therein. However, according to the present invention, the holding member may be attached in a form exposed on the outer surface of the holder. Good.
[0025]
(6) In the above embodiment, the case where the present invention is applied to a wear detection probe for a disc brake has been described. However, the present invention can also be applied to a wear detection probe for a drum brake.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment. FIG. 2 is a cross-sectional view showing a state before assembly. FIG. 3 is a partially enlarged cross-sectional view of a mounting portion of a holding member.
R ... Rotor B ... Brake lining material (braking piece)
P ... Wear detection probe 10 ... Holder 12 ... Fitting part 14 ... Receiving surface 14A ... Restricting part 20 ... Detection electric wire 21 ... Folding part 30 ... Holding member 33 ... Winding part

Claims (3)

ホルダに対し、その前端で折り返して2本の挿通孔に通して後方へ延出させるように検知用電線を組み付けて構成されるとともに、
ロータとの接触を可能とされた制動片に対し、前記検知用電線の折り返し部を前記ロータに対向させるように設けられ、
その制動片の摩耗程度が使用限界に達したか否かを前記検知用電線の前記折り返し部における断線の有無によって検出するものであって、
前記検知用電線のうち一方の前記挿通孔に挿通されている部分を前方からの引張りに抗する引っ掛かりを生じるように曲げた状態で保持する保持部材を備えており、
前記ホルダには、前記保持部材を前方移動規制状態に取付け可能な嵌合部が形成され、
前記保持部材が前記嵌合部に取り付けられた状態では、前記検知用電線が前記保持部材と前記ホルダとの間で挟み付けられるようになっているとともに、
前記嵌合部に前記保持部材を取り付けることで、前記検知用電線における前記保持部材への保持部分の前記ホルダに対する前方への変位が規制され、
前記検知用電線の折返部において前記保持部材側の挿通孔から反対側の挿通孔に向かう方向が、車両が前進する際の前記ロータの回転方向と同じ向きとなっていることを特徴とする制動片の摩耗検知プローブ。
The holder is configured by assembling a detection electric wire so that the holder is folded at the front end and passed through the two insertion holes to extend backward,
For the braking piece that is allowed to contact the rotor, the folded portion of the detection electric wire is provided to face the rotor,
Whether the degree of wear of the braking piece has reached the use limit or not is detected by the presence or absence of disconnection in the folded portion of the detection wire,
A holding member is provided that holds the portion inserted into the insertion hole of one of the detection electric wires in a bent state so as to generate a hook that resists pulling from the front,
The holder is formed with a fitting portion capable of attaching the holding member in a forward movement restricted state,
In the state where the holding member is attached to the fitting portion, the detection electric wire is sandwiched between the holding member and the holder,
Wherein by mounting said holding member in the fitting portion, the displacement of the forward is restricted with respect to the holder holding portion to the holding member in the detection wire,
Braking , wherein a direction from the insertion hole on the holding member side to the insertion hole on the opposite side in the folded portion of the detection electric wire is the same direction as the rotation direction of the rotor when the vehicle moves forward Single wear detection probe.
請求項1記載のものにおいて、
前記保持部材には、前記検知用電線を巻き付けさせることによりその検知用電線を保持する巻き付け部が形成されていることを特徴とする制動片の摩耗検知プローブ。
In claim 1,
The brake member wear detection probe, wherein the holding member is formed with a winding portion for holding the detection electric wire by winding the detection electric wire.
請求項1又は請求項2記載のものにおいて、
前記検知用電線が挟み付けられる領域における前記保持部材と前記ホルダのうちの少なくとも一方には、前記検知用電線の外周に食い込んでその変位を規制する規制部が形成されていることを特徴とする制動片の摩耗検知プローブ。
In claim 1 or claim 2,
At least one of the holding member and the holder in a region where the detection electric wire is sandwiched is formed with a restricting portion that bites into the outer periphery of the detection electric wire and restricts its displacement. Brake piece wear detection probe.
JP28286598A 1998-10-05 1998-10-05 Brake piece wear detection probe Expired - Fee Related JP3882102B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28286598A JP3882102B2 (en) 1998-10-05 1998-10-05 Brake piece wear detection probe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28286598A JP3882102B2 (en) 1998-10-05 1998-10-05 Brake piece wear detection probe

Publications (2)

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JP2000110871A JP2000110871A (en) 2000-04-18
JP3882102B2 true JP3882102B2 (en) 2007-02-14

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