JP2009173090A - Vehicular steering unit - Google Patents

Vehicular steering unit Download PDF

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JP2009173090A
JP2009173090A JP2008011865A JP2008011865A JP2009173090A JP 2009173090 A JP2009173090 A JP 2009173090A JP 2008011865 A JP2008011865 A JP 2008011865A JP 2008011865 A JP2008011865 A JP 2008011865A JP 2009173090 A JP2009173090 A JP 2009173090A
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housing
pinion shaft
inner ring
annular
ring
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Eiji Tanaka
英治 田中
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JTEKT Corp
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JTEKT Corp
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  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular steering unit that reliably prevents a holder of a pinion shaft supporting bearing from coming off. <P>SOLUTION: A threaded member 22 screwed into the inner circumference of the pinion housing 2 is equipped with a ring-shaped body 31, which presses the top end 27a of the outer ring 27 of a first bearing 3 that rotates the pinion shaft 5. A regulator member 36 is provided protruding from the inner circumference 31b of the body 31 in the diametrical direction Y1. The minimum inside diameter d1 of the regulator member 36 is smaller than the outside diameter d2 of the inner ring 28 (d1<d2). The regulator member 36 prevents the holder 30 from coming off. Should the holder 30 break and come off, the regulator member 36 prevents the inner ring 28 from coming off. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ラックアンドピニオン式の車両用操舵装置に関するものである。   The present invention relates to a rack and pinion type vehicle steering apparatus.

ラックアンドピニオン式の車両用操舵装置として、例えば特許文献１の車両用操舵装置が提案されている。特許文献１の車両用操舵装置では、ピニオン軸を筒状のハウジング内に回転可能に支持する軸受が設けられている。その軸受の内輪とピニオン軸との軸方向相対移動が規制されている。また、ハウジング上部の入口の内周ねじ部には、いわゆるトッププラグがねじ込まれている。そのトッププラグが、軸受の外輪に係合することにより、軸受およびピニオン軸が、ハウジングの入口から抜脱することが防止されている。
特開２００５−１４８１５号公報 As a rack and pinion type vehicle steering device, for example, a vehicle steering device of Patent Document 1 has been proposed. In the vehicle steering apparatus disclosed in Patent Document 1, a bearing that rotatably supports a pinion shaft in a cylindrical housing is provided. Axial relative movement between the inner ring of the bearing and the pinion shaft is restricted. A so-called top plug is screwed into the inner peripheral threaded portion of the inlet at the top of the housing. Since the top plug engages with the outer ring of the bearing, the bearing and the pinion shaft are prevented from being pulled out from the inlet of the housing.
Japanese Patent Laid-Open No. 2005-14815

しかしながら、何らかの原因で保持器が軸受から抜脱され、環状のトッププラグ内へ進入する場合がある。
その原因としては、ピニオン軸および軸受の寸法のバラツキや軸受内部の錆び発生のために、ボールがスムーズに移動できなくなり、その結果、進み遅れを生じたボールによって、保持器が軸受外へ押し出される場合が考えられる。 However, for some reason, the cage may be pulled out of the bearing and enter the annular top plug.
The cause is that the ball cannot move smoothly due to variations in the dimensions of the pinion shaft and the bearing and rusting inside the bearing, and as a result, the cage is pushed out of the bearing by the ball that has advanced and delayed. There are cases.

本発明は上記課題に鑑みてなされたものであり、保持器の抜脱を確実に防止することができる車両用操舵装置を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle steering apparatus that can reliably prevent the retainer from being removed.

上記課題を解決するため、本発明は、上部に入口（２０）を有し、その入口の内周にねじ部（２１）を有するする筒状のハウジング（２）と、そのハウジング内に挿通され、ラック軸と噛み合うピニオン（５ａ）を有するピニオン軸（５）と、ハウジングによって保持されピニオン軸を回転可能に支持する軸受（３）と、ハウジングの上記ねじ部にねじ込まれた環状のねじ部材（２２）と、を備え、上記軸受は、ハウジングによって軸方向下方への移動が規制された外輪（２７）と、ピニオン軸とは軸方向に同行移動可能な内輪（２８）と、外輪および内輪の間に介在する複数の転動体（２９）と、これらの転動体を保持する保持器（３０）と、を含み、上記ねじ部材は、上記外輪を軸方向に止定するために外輪の上端（２７ａ）を押圧する環状の本体（３１）と、本体の内周（３１ｂ）から径方向内方に突出し、上記保持器の抜脱を規制する規制部（３６）とを含むことを特徴とするものである。   In order to solve the above-mentioned problems, the present invention includes a cylindrical housing (2) having an inlet (20) at the top and a threaded portion (21) on the inner periphery of the inlet, and being inserted into the housing. , A pinion shaft (5) having a pinion (5a) meshing with the rack shaft, a bearing (3) held by the housing and rotatably supporting the pinion shaft, and an annular screw member screwed into the threaded portion of the housing ( 22), and the bearing includes an outer ring (27) whose movement downward in the axial direction is restricted by the housing, an inner ring (28) that can move along the axial direction with the pinion shaft, and an outer ring and an inner ring A plurality of rolling elements (29) interposed therebetween, and a retainer (30) that holds the rolling elements, and the screw member is configured to fix the outer ring in the axial direction (the upper end of the outer ring ( 27a) is pressed And Jo body (31) and is characterized in that it comprises projecting radially inward from the inner periphery of the main body (31b), regulating portion for regulating the pull-out of the retainer and (36).

本発明によれば、ハウジングの上部の入口のねじ部にねじ込まれたねじ部材が、ピニオン軸を回転可能にする軸受の外輪の上端を押圧する環状の本体を備えており、その本体の内周から径方向内方に突出する規制部によって、上記軸受の保持器の抜脱を防止することができる。
また、上記規制部の最小内径（ｄ１）は、内輪の外径（ｄ２）よりも小さくされており、規制部によって、ハウジングからの内輪の抜脱が規制されるようにしてある場合がある（請求項２）。その場合、保持器の抜脱を確実に防止することができる。しかも、万一、破損等により保持器が抜脱したとしても、規制部によって、内輪の抜脱が防止される。したがって、軸受およびピニオン軸がハウジングから抜脱することが確実に防止される。 According to the present invention, the screw member screwed into the screw portion of the inlet at the upper part of the housing includes the annular main body that presses the upper end of the outer ring of the bearing that enables the pinion shaft to rotate, and the inner periphery of the main body By means of the restricting portion protruding radially inward from the bearing, it is possible to prevent the bearing retainer from being pulled out.
The minimum inner diameter (d1) of the restricting portion is smaller than the outer diameter (d2) of the inner ring, and the restricting portion may restrict the removal of the inner ring from the housing. Item 2). In that case, it is possible to reliably prevent the cage from being pulled out. In addition, even if the cage is pulled out due to breakage or the like, the inner ring is prevented from being pulled out by the restricting portion. Therefore, the bearing and the pinion shaft are reliably prevented from being removed from the housing.

また、上記ピニオン軸によって保持され、ピニオン軸と内輪の軸方向相対移動を規制するために内輪の上端（２８ａ）に当接する環状部材（３９）を備え、上記規制部の最小内径は、環状部材（３９）の外径（ｄ３）よりも大きくされている場合がある（請求項３）。その場合、例えばねじ部材および環状部材の位置をピニオン軸の軸方向に関して一部重複させて、軸方向の小型化を図ることも可能である。   In addition, an annular member (39) that is held by the pinion shaft and abuts on the upper end (28a) of the inner ring to restrict the relative movement of the pinion shaft and the inner ring in the axial direction is provided. The outer diameter (d3) of (39) may be larger (claim 3). In that case, for example, the positions of the screw member and the annular member may be partially overlapped with respect to the axial direction of the pinion shaft, so that the axial size can be reduced.

また、上記規制部に、内輪の上端との干渉を防止するための逃げ部（３７）が設けられている場合がある（請求項４）。その場合、保持器の抜脱を防止するために、規制部をねじ部材の環状の本体の径方向内方に突出させても、当該規制部と内輪との干渉が、逃げ部によって防止される。
また、上記規制部の最小内径は、内輪の外径よりも大きく、かつ外輪の内径（ｄ４）よりも小さくされている場合がある（請求項５）。その場合、規制部によって保持器の抜脱を防止できるので、軸受の周方向に関して複数の転動体の偏りを防止でき、その結果、軸受およびピニオン軸の抜脱を確実に防止することができる。 Further, the restricting portion may be provided with a relief portion (37) for preventing interference with the upper end of the inner ring (claim 4). In that case, in order to prevent the retainer from being pulled out, even if the restricting portion protrudes radially inward of the annular main body of the screw member, interference between the restricting portion and the inner ring is prevented by the escape portion. .
The minimum inner diameter of the restricting portion may be larger than the outer diameter of the inner ring and smaller than the inner diameter (d4) of the outer ring. In that case, since the retainer can be prevented from being pulled out by the restricting portion, the bias of the plurality of rolling elements can be prevented in the circumferential direction of the bearing, and as a result, the bearing and the pinion shaft can be reliably prevented from being pulled out.

また、上記ねじ部材の本体の内周に保持され、上記ねじ部材の本体の内周とピニオン軸の外周（５ｂ）との間を封止するための環状のシール部材（３５）を備え、上記規制部によってシール部材の軸方向下方への移動が規制されている場合がある（請求項６）。その場合、ねじ部材およびシール部材を一体的なユニットとして取り扱うことができ、したがって、組み立て易く、また、修理のときに取外し易くメンテナンスがし易い。   And an annular seal member (35) that is held on the inner periphery of the screw member main body and seals between the inner periphery of the screw member main body and the outer periphery (5b) of the pinion shaft, There is a case where movement of the seal member downward in the axial direction is restricted by the restricting portion (claim 6). In that case, the screw member and the seal member can be handled as an integral unit, and therefore, it is easy to assemble, and can be easily removed and maintained during repair.

また、上記ねじ部材の本体の外周とハウジングの内周との間を封止するシール部材を備えることが、外部からの水分の浸入を防止するうえで好ましい。そのシール部材としては、例えば液体パッキンを例示することができる。
なお、上記において、括弧内の英数字は、後述する実施形態における対応構成要素の参照符号を表すものであるが、これらの参照符号により特許請求の範囲を限定する趣旨ではない。 In addition, it is preferable to provide a seal member that seals between the outer periphery of the main body of the screw member and the inner periphery of the housing in order to prevent moisture from entering from the outside. As the sealing member, for example, liquid packing can be exemplified.
In the above description, the alphanumeric characters in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

本発明の好ましい実施の形態について添付図面を参照しながら説明する。図１は本発明の一実施形態に係る車両用操舵装置の要部を示す概略断面図である。
図１を参照して、車両用操舵装置１は、ラックアンドピニオン式の操舵装置である。車両用操舵装置１は、筒状のピニオンハウジング２と、ピニオンハウジング２によって第１の軸受３および第２の軸受４を介して回転可能に支持されたピニオン軸５と、ピニオン軸５のピニオン５ａに噛み合うラック歯６ａを有するラック軸６とを備えている。ピニオン軸５およびラック軸６によって、転舵機構としてのラックアンドピニオン機構７が構成されている。 Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing a main part of a vehicle steering apparatus according to an embodiment of the present invention.
Referring to FIG. 1, a vehicle steering apparatus 1 is a rack and pinion type steering apparatus. A vehicle steering apparatus 1 includes a cylindrical pinion housing 2, a pinion shaft 5 rotatably supported by the pinion housing 2 via a first bearing 3 and a second bearing 4, and a pinion 5a of the pinion shaft 5. And a rack shaft 6 having rack teeth 6a meshing with each other. The pinion shaft 5 and the rack shaft 6 constitute a rack and pinion mechanism 7 as a turning mechanism.

ピニオン軸５は、例えばステアリングホイールからなる操舵部材８とは、ステアリングシャフト９ａおよび中間部材９ｂを介して同行回転可能に連結されている。ラック軸６は、ピニオンハウジング２とは交差状に連結された図示しない筒状のラックハウジングによって、軸長方向（紙面に直交する方向）に移動可能に支持されている。図示していないが、ラック軸６の両端部は、タイロッドを介して転舵輪に連結されており、操舵部材８の回転に伴って、ラック軸６が軸長方向に移動し操向が行われるようになっている。   The pinion shaft 5 is connected to a steering member 8 made of, for example, a steering wheel so as to be able to rotate along with the steering shaft 9a and an intermediate member 9b. The rack shaft 6 is supported by a cylindrical rack housing (not shown) connected in a crossing manner with the pinion housing 2 so as to be movable in the axial direction (direction perpendicular to the paper surface). Although not shown, both ends of the rack shaft 6 are coupled to the steered wheels via tie rods, and the rack shaft 6 moves in the axial length direction as the steering member 8 rotates, and steering is performed. It is like that.

ピニオンハウジング２には、ラック軸６を隔ててピニオン軸５とは反対側に筒状のサポートハウジング１０が設けられており、そのサポートハウジング１０に、ラック軸支持装置１１が取り付けられている。ラック軸支持装置１１は、サポートハウジング１０内に前後に進退可能に収容された支持部材としての円筒状のサポートヨーク１２と、サポートハウジング１０の入口のねじ部１０ａに固定された封止部材１３と、サポートヨーク１２と封止部材１３との間に介在し、サポートヨーク１２を介してラック軸６をピニオン軸５に向けて付勢する例えば圧縮コイルばねからなる付勢部材１４とを備えている。   The pinion housing 2 is provided with a cylindrical support housing 10 on the opposite side of the pinion shaft 5 across the rack shaft 6, and a rack shaft support device 11 is attached to the support housing 10. The rack shaft support device 11 includes a cylindrical support yoke 12 as a support member accommodated in the support housing 10 so as to be able to advance and retreat back and forth, and a sealing member 13 fixed to a screw portion 10a at the entrance of the support housing 10. And a biasing member 14 made of, for example, a compression coil spring, which is interposed between the support yoke 12 and the sealing member 13 and biases the rack shaft 6 toward the pinion shaft 5 via the support yoke 12. .

サポートヨーク１２の前面１２ａには、ラック軸６を軸長方向に摺動自在に支持する凹部１５が形成されている。その凹部１５には、ラック軸６に摺接する低摩擦部材からなるパッド１６が取り付けられている。
封止部材１３の前面１３ａとサポートヨーク１２の後面１２ｂとの間には、所定の隙間Ｓが形成されている。その隙間Ｓの量は、封止部材１３のねじ込み位置の調整により、例えば０．１ｍｍのように厳密に調整されている。 The front surface 12a of the support yoke 12 is formed with a recess 15 that supports the rack shaft 6 so as to be slidable in the axial direction. A pad 16 made of a low friction member that is in sliding contact with the rack shaft 6 is attached to the recess 15.
A predetermined gap S is formed between the front surface 13 a of the sealing member 13 and the rear surface 12 b of the support yoke 12. The amount of the gap S is strictly adjusted to 0.1 mm, for example, by adjusting the screwing position of the sealing member 13.

サポートヨーク１２の外周面に形成された一対の周溝に、例えばＯリングからなる環状の弾性部材１７がそれぞれ収容され、これら弾性部材１７が、サポートハウジング１０の内周に弾性的に接触することにより、サポートヨーク１２を径方向に弾性支持し、サポートヨーク１２のがたつきを防止している。
封止部材１３の後面１３ｂには、封止部材１３を回動操作する工具に係合するための、例えば断面多角形形状の工具係合孔１８が形成されている。 An annular elastic member 17 made of, for example, an O-ring is accommodated in a pair of circumferential grooves formed on the outer peripheral surface of the support yoke 12, and these elastic members 17 elastically contact the inner periphery of the support housing 10. Thus, the support yoke 12 is elastically supported in the radial direction to prevent the support yoke 12 from rattling.
On the rear surface 13b of the sealing member 13, for example, a tool engagement hole 18 having a polygonal cross section for engaging with a tool for rotating the sealing member 13 is formed.

ピニオンハウジング２は、ピニオン軸５の下部を収容するための収容孔１９を有している。収容孔１９の入口２０の内周には、ねじ部２１が形成され、そのねじ部２１に、環状のねじ部材２２がねじ込まれている。また、収容孔１９の入口２０からの水分等の浸入を防止するために、ピニオンハウジング２の上端に筒状のダストカバー２３が被せられている。ダストカバー２３には、ピニオン軸５を液密的に挿通させる挿通孔２４を有している。   The pinion housing 2 has an accommodation hole 19 for accommodating the lower part of the pinion shaft 5. A screw portion 21 is formed on the inner periphery of the inlet 20 of the accommodation hole 19, and an annular screw member 22 is screwed into the screw portion 21. In addition, a cylindrical dust cover 23 is placed on the upper end of the pinion housing 2 in order to prevent moisture and the like from entering from the inlet 20 of the accommodation hole 19. The dust cover 23 has an insertion hole 24 through which the pinion shaft 5 is inserted in a liquid-tight manner.

第１の軸受３および第２の軸受４は、ピニオン軸５のピニオン５ａを挟んだ上下に配置されており、それぞれ、ピニオンハウジング２の収容孔１９の内周に設けられた対応する軸受保持部２５，２６によって支持されている。第１の軸受３のための軸受保持部２５は、上記ねじ部２１に隣接して設けられている。
第１の軸受３は、例えば転がり軸受としての玉軸受からなり、第２の軸受４は例えば転がり軸受としての円筒ころ軸受からなる。第１の軸受３は、ピニオンハウジング２によって軸方向Ｘ１の下方への移動が規制された外輪２７と、ピニオン軸５とは軸方向Ｘ１に同行移動可能な内輪２８と、外輪２７および内輪２８の間に介在する複数のボールからなる転動体２９と、転動体２９を保持する例えば冠形の保持器３０とを含んでいる。 The first bearing 3 and the second bearing 4 are arranged above and below the pinion 5 a of the pinion shaft 5, and corresponding bearing holding portions provided on the inner periphery of the accommodation hole 19 of the pinion housing 2, respectively. 25, 26. A bearing holding portion 25 for the first bearing 3 is provided adjacent to the screw portion 21.
The first bearing 3 is composed of, for example, a ball bearing as a rolling bearing, and the second bearing 4 is composed of, for example, a cylindrical roller bearing as a rolling bearing. The first bearing 3 includes an outer ring 27 in which the downward movement in the axial direction X1 is restricted by the pinion housing 2, an inner ring 28 that can move along the axial direction X1 with the pinion shaft 5, and the outer ring 27 and the inner ring 28. A rolling element 29 composed of a plurality of balls interposed therebetween and a crown-shaped cage 30 that holds the rolling element 29 are included.

保持器３０において各転動体２９を保持するためのポケット部３０ａは下向きに開放されている。
図２および図３を参照して、上記ねじ部材２２は、外輪２７を軸方向Ｘ１に止定するために外輪２７の上端２７ａを押圧する環状の本体３１を備えている。図１を参照して、本体３１の外周３１ａに形成されたねじ部３２が、収容孔１９の入口２０のねじ部２１にねじ込まれている。外輪２７は、収容孔１９の内周に形成された環状段部３３とねじ部材２２の下面の当接部３４との間に挟持されて、ピニオンハウジング２に対する軸方向移動が規制されている。 The pocket 30a for holding each rolling element 29 in the cage 30 is opened downward.
2 and 3, the screw member 22 includes an annular main body 31 that presses the upper end 27a of the outer ring 27 in order to fix the outer ring 27 in the axial direction X1. With reference to FIG. 1, a screw portion 32 formed on the outer periphery 31 a of the main body 31 is screwed into the screw portion 21 of the inlet 20 of the accommodation hole 19. The outer ring 27 is sandwiched between an annular step portion 33 formed on the inner periphery of the accommodation hole 19 and the abutting portion 34 on the lower surface of the screw member 22, so that axial movement relative to the pinion housing 2 is restricted.

本体３１の内周３１ｂには、環状のシール部材３５が保持されており、そのシール部材３５は、本体３１の内周３１ｂとピニオン軸５の外周５ｂとの間を封止する。図３に示すように、シール部材３５は、芯金３５ａと、ピニオン軸５の外周５ｂに係合するリップ（図示せず）を有するゴム部材３５ｂとを備えている。
また、図２および図３を参照して、ねじ部材２２は、本体３１の内周３１ｂから径方向Ｙ１の内方に突出する規制部３６を備えており、その規制部３６は、第１の軸受３の保持器２８の抜脱を規制する機能を果たす。本体３１の内周３１ｂの上部は、拡径されており、当該ねじ部材２２を回動操作するための工具が係合される工具係合部４０とされている。工具係合部４０は例えば六角形等の多角形断面をなしている。 An annular seal member 35 is held on the inner periphery 31 b of the main body 31, and the seal member 35 seals between the inner periphery 31 b of the main body 31 and the outer periphery 5 b of the pinion shaft 5. As shown in FIG. 3, the seal member 35 includes a metal core 35 a and a rubber member 35 b having a lip (not shown) that engages with the outer periphery 5 b of the pinion shaft 5.
2 and 3, the screw member 22 includes a restricting portion 36 that protrudes inward in the radial direction Y1 from the inner circumference 31b of the main body 31, and the restricting portion 36 includes the first restricting portion 36. It fulfills the function of regulating the removal of the cage 28 of the bearing 3. The upper part of the inner periphery 31b of the main body 31 has an enlarged diameter, and serves as a tool engaging portion 40 with which a tool for rotating the screw member 22 is engaged. The tool engaging portion 40 has a polygonal cross section such as a hexagon.

図３に示すように、規制部３６の最小内径ｄ１（規制部３６の内周３６ａの径に相当）は、内輪２８の外径ｄ２よりも小さくされている（ｄ１＜ｄ２）。これにより、規制部３６によって、ピニオンハウジング２からの内輪２８の抜脱が防止されるようになっている。また、規制部３６には、内輪２８の上端２８ａとの干渉を防止するための環状の逃げ部３７が設けられている。具体的には、規制部３６の下面３６ｂに逃げ部３７が形成されている。   As shown in FIG. 3, the minimum inner diameter d1 of the restricting portion 36 (corresponding to the diameter of the inner periphery 36a of the restricting portion 36) is smaller than the outer diameter d2 of the inner ring 28 (d1 <d2). As a result, the restriction portion 36 prevents the inner ring 28 from being removed from the pinion housing 2. Further, the restricting portion 36 is provided with an annular relief portion 37 for preventing interference with the upper end 28a of the inner ring 28. Specifically, an escape portion 37 is formed on the lower surface 36 b of the restricting portion 36.

上記シール部材３５は、規制部３６の上面３６ｃに当接しており、規制部３６によって、シール部材３５の軸方向Ｘ１の下方への移動が規制されている。
一方、図１に示すように、内輪２８は、ピニオン軸５の外周に設けられた環状段部３８とピニオン軸５の外周に固定された環状部材３９との間に挟持されて、ピニオン軸５に対する軸方向移動が規制されている。図４に示すように、環状部材３９の外周３９ａには、周方向に等間隔を隔てて配置された複数の外向突起３９ｂが設けられており、外向突起３９ｂの外径が、環状部材３９の最大外径ｄ３となっている。外向突起３９ｂの径は、環状の素材の外周を複数箇所（図の例では４箇所）、径方向内方へかしめ付けた（塑性変形させた）ときに、上記環状の素材のもともとの形状を残す部分の外径に相当する。 The seal member 35 is in contact with the upper surface 36c of the restricting portion 36, and the restricting portion 36 restricts the downward movement of the seal member 35 in the axial direction X1.
On the other hand, as shown in FIG. 1, the inner ring 28 is sandwiched between an annular step portion 38 provided on the outer periphery of the pinion shaft 5 and an annular member 39 fixed to the outer periphery of the pinion shaft 5. Axial movement with respect to is restricted. As shown in FIG. 4, a plurality of outward projections 39 b arranged at equal intervals in the circumferential direction are provided on the outer periphery 39 a of the annular member 39, and the outer diameter of the outward projection 39 b is equal to that of the annular member 39. The maximum outer diameter is d3. The diameter of the outward projection 39b is the same as the original shape of the annular material when the outer periphery of the annular material is caulked (plastically deformed) at a plurality of locations (four locations in the example in the figure) and radially inward. Corresponds to the outer diameter of the remaining part.

図３に示すように、規制部３６および環状部材３９の互いの少なくとも一部が、径方向に対向している。規制部３６の最小内径ｄ１は、環状部材３９の最大外径ｄ３よりも大きくされている。これにより、ピニオン軸５の軸方向Ｘ１に関して、規制部３６および環状部材３９の互いの少なくとも一部が重なる位置に配置することが可能となり、軸方向Ｘ１の小型化に寄与することができる。   As shown in FIG. 3, at least a part of the restricting portion 36 and the annular member 39 are opposed to each other in the radial direction. The minimum inner diameter d1 of the restricting portion 36 is set larger than the maximum outer diameter d3 of the annular member 39. Thereby, with respect to the axial direction X1 of the pinion shaft 5, it becomes possible to arrange the restricting portion 36 and the annular member 39 at a position where at least a part of each other overlaps, which can contribute to downsizing of the axial direction X1.

本実施の形態によれば、ピニオンハウジング２の上部の入口２０のねじ部２１にねじ込まれたねじ部材２２が、ピニオン軸５を回転可能にする第１の軸受３の外輪２７の上端２７ａを押圧する環状の本体３１を備えており、その本体３１の内周３１ｂから径方向Ｙ１の内方に突出する規制部３６によって、第１の軸受３の保持器３０の抜脱を確実に防止することができる。   According to the present embodiment, the screw member 22 screwed into the screw portion 21 of the inlet 20 at the top of the pinion housing 2 presses the upper end 27a of the outer ring 27 of the first bearing 3 that enables the pinion shaft 5 to rotate. The retaining portion 30 of the first bearing 3 is reliably prevented from being pulled out by the restricting portion 36 that protrudes inward in the radial direction Y1 from the inner periphery 31b of the main body 31. Can do.

具体的には、規制部３６の最小内径ｄ１が、内輪２８の外径ｄ２よりも小さくされている（ｄ１＜ｄ２）。したがって、万一、保持器３０の抜脱が発生したとしても、規制部３６によって、内輪２８の抜脱が防止されるので、第１の軸受３およびピニオン軸５がピニオンハウジング２から抜脱することが確実に防止される。
また、ピニオン軸５によって保持された環状部材３９が、内輪２８の上端２８ａに当接することにより、ピニオン軸５および内輪２８の軸方向Ｘ１の相対移動を規制されており、しかも、規制部３６の最小内径ｄ１が、環状部材３９の最大外径ｄ３よりも大きくされている。これにより、ねじ部材２２および環状部材３９の位置をピニオン軸５の軸方向Ｘ１に関して一部重複させることができ、軸方向Ｘ１の小型化を図ることができる。 Specifically, the minimum inner diameter d1 of the restricting portion 36 is smaller than the outer diameter d2 of the inner ring 28 (d1 <d2). Therefore, even if the retainer 30 is removed, the restriction portion 36 prevents the inner ring 28 from being removed, so that the first bearing 3 and the pinion shaft 5 can be removed from the pinion housing 2. It is surely prevented.
The annular member 39 held by the pinion shaft 5 is in contact with the upper end 28a of the inner ring 28, so that the relative movement of the pinion shaft 5 and the inner ring 28 in the axial direction X1 is restricted. The minimum inner diameter d1 is made larger than the maximum outer diameter d3 of the annular member 39. Thereby, the positions of the screw member 22 and the annular member 39 can be partially overlapped with respect to the axial direction X1 of the pinion shaft 5, and downsizing in the axial direction X1 can be achieved.

また、規制部３６に逃げ部３７が設けられているので、内輪２８の抜脱を防止するために、規制部３６をねじ部材２２の本体３１の径方向Ｙ１の内方に突出させても、当該規制部３６と内輪２８との干渉を逃げ部３７によって確実に防止することができる。
また、ねじ部材２２の本体３１の内周３１ｂに、本体３１の内周３１ｂとピニオン軸５の外周５ｂとの間を封止するための環状のシール部材３５を保持し、そのシール部材３５の軸方向Ｘ１の下方への移動を上記規制部３６によって規制するようにした。これにより、ねじ部材２２およびシール部材３５を一体的なユニットとして取り扱うことができ、したがって、組み立て易く、また、修理のときに取外し易くメンテナンスがし易い。 Further, since the relief portion 37 is provided in the restriction portion 36, even if the restriction portion 36 protrudes inward in the radial direction Y <b> 1 of the main body 31 of the screw member 22 in order to prevent the inner ring 28 from being pulled out, Interference between the restricting portion 36 and the inner ring 28 can be reliably prevented by the escape portion 37.
Further, an annular seal member 35 for sealing between the inner periphery 31 b of the main body 31 and the outer periphery 5 b of the pinion shaft 5 is held on the inner periphery 31 b of the main body 31 of the screw member 22. The downward movement in the axial direction X1 is restricted by the restriction part 36. As a result, the screw member 22 and the seal member 35 can be handled as an integral unit. Therefore, the screw member 22 and the seal member 35 can be easily assembled, and can be easily removed and maintained during repair.

なお、ねじ部材２２の本体３１の外周３１ｂのねじ部３２とピニオンハウジング２の内周との間を封止するために、例えば液体パッキン等のシール部材を用いることが、外部からの水分の浸入を確実に防止するうえで好ましい。
次いで、図５は本発明の別の実施の形態の車両用操舵装置１の要部の断面を示している。図５を参照して、本実施の形態が図３の実施の形態と異なるのは、図３の実施の形態では、ねじ部材２２の規制部３６の最小内径ｄ１が、第１の軸受３の内輪２８の外径ｄ２よりも小さくされていたが（ｄ１＜ｄ２）、本実施の形態では、ねじ部材２２の規制部３６０の最小内径ｄ１が、第１の軸受３の内輪２８の外径ｄ２よりも大きくされている（ｄ１＞ｄ２）点にある。 In order to seal between the threaded portion 32 of the outer periphery 31b of the main body 31 of the screw member 22 and the inner periphery of the pinion housing 2, for example, a seal member such as a liquid packing is used so that moisture can enter from the outside. It is preferable for reliably preventing the above.
Next, FIG. 5 shows a cross section of the main part of the vehicle steering apparatus 1 according to another embodiment of the present invention. Referring to FIG. 5, the present embodiment is different from the embodiment of FIG. 3 in that in the embodiment of FIG. 3, the minimum inner diameter d1 of the restricting portion 36 of the screw member 22 is Although it is smaller than the outer diameter d2 of the inner ring 28 (d1 <d2), in the present embodiment, the minimum inner diameter d1 of the restricting portion 360 of the screw member 22 is the outer diameter d2 of the inner ring 28 of the first bearing 3. (D1> d2).

本実施の形態においても、規制部３６０によって保持器３０の抜脱を防止することができるので、第１の軸受３の周方向に関して複数の転動体２９の偏りを防止でき、その結果、第１の軸受３およびピニオン軸５の抜脱を防止することができる。図３の実施の形態のように、規制部３６によって内輪２８の抜脱を防止すれば、より確実なフェールセーフが達成されるが、本実施の形態のようにしても、十分有効なフェールセーフ機能を果たすことができる。   Also in the present embodiment, since the retainer 30 can be prevented from being pulled out by the restricting portion 360, the bias of the plurality of rolling elements 29 can be prevented in the circumferential direction of the first bearing 3, and as a result, the first The bearing 3 and the pinion shaft 5 can be prevented from being pulled out. If the inner ring 28 is prevented from being pulled out by the restricting portion 36 as in the embodiment of FIG. 3, a more reliable fail safe is achieved. However, even in the present embodiment, a sufficiently effective fail safe is achieved. Can fulfill the function.

また、万一、保持器が破損した場合でも、シール部材３５を傷つけることなく、第１の軸受３の交換や、その他のメンテナンスを行うことができる。
なお、本発明は上記各実施の形態に限定されるものではなく、例えば、図６（ａ）、（ｂ）に示すように、規制部３６１が、ねじ部材２２の本体３１の内周３１ｂの周方向に間隔を隔てて環状に配置された複数の突起により構成されていてもよい。 In addition, even if the cage is broken, the first bearing 3 can be replaced and other maintenance can be performed without damaging the seal member 35.
The present invention is not limited to the above-described embodiments. For example, as shown in FIGS. 6A and 6B, the restricting portion 361 is provided on the inner periphery 31 b of the main body 31 of the screw member 22. You may be comprised by the some protrusion arrange | positioned cyclically | annularly at intervals in the circumferential direction.

また、図７に示すように、ねじ部材２２の本体３１の外周３１ｂの下部とピニオンハウジング２の内周との間に、例えばＯリングからなる環状の弾性部材４１を介在させて、本体３１の外周３１ｂとピニオンハウジング２の内周との間を封止してもよい。この場合、上記の液体パッキンは廃止される。   Further, as shown in FIG. 7, an annular elastic member 41 made of, for example, an O-ring is interposed between the lower part of the outer periphery 31 b of the main body 31 of the screw member 22 and the inner periphery of the pinion housing 2. The space between the outer periphery 31b and the inner periphery of the pinion housing 2 may be sealed. In this case, the above liquid packing is abolished.

本発明の一実施の形態の車両用操舵装置の要部の断面図である。It is sectional drawing of the principal part of the steering apparatus for vehicles of one embodiment of this invention. ねじ部材の断面図である。It is sectional drawing of a screw member. 図１の要部の拡大断面図である。It is an expanded sectional view of the principal part of FIG. ピニオン軸および環状部材の断面図である。It is sectional drawing of a pinion shaft and an annular member. 本発明の別の実施の形態の車両用操舵装置の要部の断面図である。It is sectional drawing of the principal part of the steering apparatus for vehicles of another embodiment of this invention. （ａ）は、本発明のさらに別の実施の形態のねじ部材の断面図であり、（ｂ）は、そのねじ部材の下面図である。(A) is sectional drawing of the screw member of another embodiment of this invention, (b) is a bottom view of the screw member. 本発明のさらに別の実施の形態の車両用操舵装置の要部の断面図である。It is sectional drawing of the principal part of the steering apparatus for vehicles of another embodiment of this invention.

符号の説明Explanation of symbols

１…車両用操舵装置、２…ピニオンハウジング（ハウジング）、３…第１の軸受（軸受）、５…ピニオン軸、５ｂ…外周、６…ラック軸、１９…収容孔、２０…入口、２１…ねじ部、２２…ねじ部材、２７…外輪、２７ａ…上端、２８…内輪、２８ａ…上端、２９…転動体、３０…保持器、３１…本体、３１ａ…外周、３１ｂ…内周、３２…ねじ部、３３…環状段部、３４…当接部、３５…シール部材、３６，３６０，３６１…規制部、３７…逃げ部、３８…環状端部、３９…環状部材、Ｘ１…軸方向、Ｙ１…径方向、ｄ１…規制部の最小内径、ｄ２…内輪の外径、ｄ３…環状部材の最大外径、ｄ４…外輪の内径   DESCRIPTION OF SYMBOLS 1 ... Vehicle steering device, 2 ... Pinion housing (housing), 3 ... 1st bearing (bearing), 5 ... Pinion shaft, 5b ... Outer periphery, 6 ... Rack shaft, 19 ... Housing hole, 20 ... Inlet, 21 ... Threaded part, 22 ... Screw member, 27 ... Outer ring, 27a ... Upper end, 28 ... Inner ring, 28a ... Upper end, 29 ... Rolling element, 30 ... Retainer, 31 ... Main body, 31a ... Outer periphery, 31b ... Inner periphery, 32 ... Screw 33, annular stepped portion, 34 ... abutting portion, 35 ... sealing member, 36, 360, 361 ... regulating portion, 37 ... relief portion, 38 ... annular end portion, 39 ... annular member, X1 ... axial direction, Y1 ... radial direction, d1 ... minimum inner diameter of restricting portion, d2 ... outer diameter of inner ring, d3 ... maximum outer diameter of annular member, d4 ... inner diameter of outer ring

Claims (6)

上部に入口を有し、その入口の内周にねじ部を有するする筒状のハウジングと、
そのハウジング内に挿通され、ラック軸と噛み合うピニオンを有するピニオン軸と、 ハウジングによって保持されピニオン軸を回転可能に支持する軸受と、
ハウジングの上記ねじ部にねじ込まれた環状のねじ部材と、を備え、
上記軸受は、ハウジングによって軸方向下方への移動が規制された外輪と、ピニオン軸とは軸方向に同行移動可能な内輪と、外輪および内輪の間に介在する複数の転動体と、これらの転動体を保持する保持器と、を含み、
上記ねじ部材は、上記外輪を軸方向に止定するために外輪の上端を押圧する環状の本体と、本体の内周から径方向内方に突出し、上記保持器の抜脱を規制する規制部とを含むことを特徴とする車両用操舵装置。 A cylindrical housing having an inlet at the top and a threaded portion on the inner periphery of the inlet;
A pinion shaft having a pinion that is inserted into the housing and meshes with the rack shaft; a bearing that is held by the housing and rotatably supports the pinion shaft;
An annular screw member screwed into the screw portion of the housing,
The bearing includes an outer ring whose movement downward in the axial direction is restricted by the housing, an inner ring that can move in the axial direction with respect to the pinion shaft, a plurality of rolling elements interposed between the outer ring and the inner ring, and the rolling elements. A cage for holding a moving body,
The screw member includes an annular main body that presses the upper end of the outer ring in order to clamp the outer ring in the axial direction, and a restricting portion that protrudes radially inward from the inner periphery of the main body and restricts removal of the cage. And a vehicle steering apparatus. 請求項１において、上記規制部の最小内径は、内輪の外径よりも小さくされており、
規制部によって、ハウジングからの内輪の抜脱が規制されるようにしてあることを特徴とする車両用操舵装置。 In claim 1, the minimum inner diameter of the restriction portion is smaller than the outer diameter of the inner ring,
A vehicle steering apparatus, wherein the restriction portion restricts removal of the inner ring from the housing. 請求項２において、上記ピニオン軸によって保持され、ピニオン軸と内輪の軸方向相対移動を規制するために内輪の上端に当接する環状部材を備え、
上記規制部の最小内径は、環状部材の外径よりも大きくされていることを特徴とする車両用操舵装置 In Claim 2, provided with an annular member that is held by the pinion shaft and abuts on the upper end of the inner ring to restrict relative movement of the pinion shaft and the inner ring in the axial direction,
The minimum steering inner diameter of the said control part is made larger than the outer diameter of an annular member, The steering apparatus for vehicles characterized by the above-mentioned 請求項２または３において、上記規制部に、内輪の上端との干渉を防止するための逃げ部が設けられていることを特徴とする車両用操舵装置。   4. The vehicle steering apparatus according to claim 2, wherein an escape portion for preventing interference with the upper end of the inner ring is provided in the restriction portion. 請求項１において、上記規制部の最小内径は、内輪の外径よりも大きく、かつ外輪の内径よりも小さくされていることを特徴とする車両用操舵装置。   2. The vehicle steering apparatus according to claim 1, wherein a minimum inner diameter of the restricting portion is larger than an outer diameter of the inner ring and smaller than an inner diameter of the outer ring. 請求項１から５の何れか１項において、上記ねじ部材の本体の内周に保持され、上記ねじ部材の本体の内周とピニオン軸の外周との間を封止するための環状のシール部材を備え、
上記規制部によってシール部材の軸方向下方への移動が規制されていることを特徴とする車両用操舵装置。 6. An annular seal member according to claim 1, wherein the annular seal member is held on the inner periphery of the main body of the screw member and seals between the inner periphery of the main body of the screw member and the outer periphery of the pinion shaft. With
The vehicle steering apparatus, wherein the restriction member restricts the downward movement of the seal member in the axial direction.
JP2008011865A 2008-01-22 2008-01-22 Vehicular steering unit Pending JP2009173090A (en)

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CN102213265A (en) * 2010-04-08 2011-10-12 夏晓峰 Bearing and installation method thereof
JP2012012006A (en) * 2010-06-03 2012-01-19 Jtekt Corp Rack pinion type steering device and rotary tool for bearing presser
CN106737437A (en) * 2017-01-11 2017-05-31 江苏东成机电工具有限公司 Hand-held tool
WO2018135107A1 (en) * 2017-01-20 2018-07-26 日立オートモティブシステムズ株式会社 Power steering apparatus
CN110214109A (en) * 2017-01-20 2019-09-06 日立汽车***株式会社 Power steering gear
JPWO2018135107A1 (en) * 2017-01-20 2019-12-12 日立オートモティブシステムズ株式会社 Power steering device
KR20220136593A (en) * 2021-03-31 2022-10-11 (주)케이에이씨 Steering system for micro vehicle
KR102550146B1 (en) * 2021-03-31 2023-07-04 (주)케이에이씨 Steering system for micro vehicle

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