JP6823902B2 - Plain bearing - Google Patents

Plain bearing Download PDF

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JP6823902B2
JP6823902B2 JP2017074068A JP2017074068A JP6823902B2 JP 6823902 B2 JP6823902 B2 JP 6823902B2 JP 2017074068 A JP2017074068 A JP 2017074068A JP 2017074068 A JP2017074068 A JP 2017074068A JP 6823902 B2 JP6823902 B2 JP 6823902B2
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bearing body
bearing
elastic member
peripheral surface
groove
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昇 中川
昇 中川
宏之 菊池
宏之 菊池
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Oiles Corp
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Description

本発明は、軸部材の軸方向の移動を許容しつつ、軸部材に加わる荷重を支持する滑り軸受に関し、特に、車両のステアリング機構に用いられるラックブッシュに好適な滑り軸受に関する。 The present invention relates to a slide bearing that supports a load applied to the shaft member while allowing the shaft member to move in the axial direction, and more particularly to a slide bearing suitable for a rack bush used in a steering mechanism of a vehicle.

特許文献１には、車両のステアリング機構に用いられるラックブッシュに好適な滑り軸受として、円筒状のハウジング内に軸方向の移動が規制された状態で収容され、ラック軸の軸方向の移動を許容しつつ、ラック軸に加わる荷重を支持する滑り軸受が記載されている。 Patent Document 1 states that, as a slide bearing suitable for a rack bush used in a vehicle steering mechanism, it is housed in a cylindrical housing in a state where axial movement is restricted, and axial movement of the rack shaft is permitted. However, plain bearings that support the load applied to the rack shaft are described.

この滑り軸受は、ラック軸が挿入される円筒状の軸受本体と、軸受本体に装着され、ゴム、エラストマー等の弾性体からなり、軸受本体を径方向内方に付勢する弾性リングと、を備えている。軸受本体は、合成樹脂製であり、一方の端面から他方の端面に向けて軸方向に沿って形成された第一のスリットと、他方の端面から一方の端面に向けて軸方向に沿って形成された第二のスリットと、軸受本体の外周面に形成され、弾性リングが装着される装着溝と、を有している。 This plain bearing includes a cylindrical bearing body into which a rack shaft is inserted, and an elastic ring that is mounted on the bearing body and is made of an elastic body such as rubber or elastomer and urges the bearing body inward in the radial direction. I have. The bearing body is made of synthetic resin and has a first slit formed along the axial direction from one end face to the other end face and an axial direction from the other end face to one end face. It has a second slit formed therein and a mounting groove formed on the outer peripheral surface of the bearing body to which an elastic ring is mounted.

この滑り軸受によれば、弾性リングによって軸受本体が縮径し、軸受本体に挿入されたラック軸を締め付けるので、軸受本体の内周面とラック軸の外周面との間のクリアランスをゼロにして、軸受本体の内周面とラック軸の外周面との衝突による不快音の発生を防止することができるとともに、ラック軸の外径寸法誤差による摩擦トルクの変動を防止することができる。 According to this sliding bearing, the diameter of the bearing body is reduced by the elastic ring and the rack shaft inserted into the bearing body is tightened, so that the clearance between the inner peripheral surface of the bearing body and the outer peripheral surface of the rack shaft is set to zero. It is possible to prevent the generation of unpleasant noise due to the collision between the inner peripheral surface of the bearing body and the outer peripheral surface of the rack shaft, and to prevent the fluctuation of the friction torque due to the outer diameter dimensional error of the rack shaft.

特開２００８−１５１２８９号公報Japanese Unexamined Patent Publication No. 2008-151289

ところで、特許文献１に記載の滑り軸受は、軸受本体に挿入されたラック軸と滑り軸受が収容されたハウジングとの間に挟まれて、軸受本体に装着された弾性リングが圧縮変形した状態で使用される。このため、弾性リングに用いられるゴム、エラストマー等の弾性体の劣化が進行して、滑り軸受の寿命が短くなるという問題がある。 By the way, the slide bearing described in Patent Document 1 is sandwiched between a rack shaft inserted in the bearing body and a housing in which the slide bearing is housed, and the elastic ring mounted on the bearing body is compressed and deformed. used. Therefore, there is a problem that the elastic bodies such as rubber and elastomer used for the elastic ring are deteriorated and the life of the slide bearing is shortened.

本発明は、上記事情に鑑みてなされたものであり、その目的は、弾性体の耐久性を向上させて長寿命化を図ることができる滑り軸受を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a slide bearing capable of improving the durability of an elastic body and extending the life of the elastic body.

上記課題を解決するために、本発明の滑り軸受では、軸部材が挿入される、径方向に伸縮可能な筒状の軸受本体に、軸受本体の外周面から外方に突出する弾性部材を装着している。そして、弾性部材に、軸受本体の径方向に対して傾斜しながら外方に突出して、例えば筒状のハウジング内に収容した場合に、このハウジングの内周面と当接する突出部を設けている。 In order to solve the above problems, in the slide bearing of the present invention, an elastic member protruding outward from the outer peripheral surface of the bearing body is attached to a cylindrical bearing body into which a shaft member is inserted and which can be expanded and contracted in the radial direction. doing. Then, the elastic member is provided with a protruding portion that projects outward while inclining in the radial direction of the bearing body and comes into contact with the inner peripheral surface of the housing, for example, when it is housed in a tubular housing. ..

例えば、本発明の滑り軸受の第一の態様は、
筒状のハウジング内に収容され、軸部材の軸方向の移動および回転の少なくとも一方を許容しつつ、前記軸部材に加わる荷重を支持する滑り軸受であって、
径方向に伸縮可能な筒状の軸受本体と、
前記軸受本体に装着され、前記軸受本体の径方向に対して傾斜しながら前記軸受本体の外周面から外方に突出する突出部を有する弾性部材と、を備え、
前記軸受本体は、
一方の端部において外周面から外方に突出して、前記ハウジングの内周面に周方向に形成された環状溝に挿入される係合部を有し、
前記弾性部材は、
前記軸受本体の前記係合部とともに前記ハウジングの前記環状溝に挿入され、当該環状溝の側面と当接する係合用弾性部をさらに有し、
前記滑り軸受を前記ハウジング内に収容した場合に、前記突出部が前記ハウジングの内周面と当接して、前記軸受本体を径方向内方に付勢する。 For example, the first aspect of the slide bearing of the present invention is
A plain bearing housed in a tubular housing that supports a load applied to the shaft member while allowing at least one of axial movement and rotation of the shaft member.
A tubular bearing body that can expand and contract in the radial direction,
An elastic member mounted on the bearing body and having a protruding portion protruding outward from the outer peripheral surface of the bearing body while being inclined with respect to the radial direction of the bearing body .
The bearing body
At one end, it has an engaging portion that projects outward from the outer peripheral surface and is inserted into an annular groove formed in the circumferential direction on the inner peripheral surface of the housing.
The elastic member is
It further has an engaging elastic portion that is inserted into the annular groove of the housing together with the engaging portion of the bearing body and abuts on the side surface of the annular groove.
When the slide bearing is housed in the housing, the protruding portion abuts on the inner peripheral surface of the housing to urge the bearing body inward in the radial direction .

また、本発明の滑り軸受の第二の態様は、
径方向に伸縮可能な筒状の軸受本体と、
前記軸受本体に装着され、前記軸受本体の径方向に対して傾斜しながら前記軸受本体の外周面から外方に突出する突出部を有する弾性部材と、を備え、
前記軸受本体は、
外周面に形成され、底部の溝幅が開口部の溝幅より広い保持溝を有し、
前記弾性部材は、
前記軸受本体の前記保持溝に収容され、当該保持溝と同形状の被保持部をさらに有する。
 The second aspect of the slide bearing of the present invention is
A tubular bearing body that can expand and contract in the radial direction,
An elastic member mounted on the bearing body and having a protruding portion protruding outward from the outer peripheral surface of the bearing body while being inclined with respect to the radial direction of the bearing body.
The bearing body
It is formed on the outer peripheral surface and has a holding groove whose bottom groove width is wider than the groove width of the opening.
The elastic member is
It is housed in the holding groove of the bearing body and further has a held portion having the same shape as the holding groove .

本発明では、滑り軸受を例えば筒状のハウジング内に収容した場合に、弾性部材の径方向外方の端部がハウジングの内周面と当接して、軸受本体を径方向内方に付勢する。これにより、軸受本体が縮径して、軸受本体に挿入された軸部材を締め付ける。この際、弾性部材の突出部がハウジングの内周面と当接して曲げ変形する。弾性部材に用いられるゴム、エラストマー等の弾性体の劣化は、一般に、曲げ変形よりも圧縮変形の影響の方が大きい。本発明によれば、弾性部材に加わる圧縮応力の一部を曲げ変形により逃がすことができるので、その分だけ圧縮変形量を小さくでき、これにより弾性部材の耐久性を向上させて、滑り軸受の長寿命化を図ることができる。 In the present invention, when the slide bearing is housed in, for example, a tubular housing, the radial outer end of the elastic member abuts on the inner peripheral surface of the housing to urge the bearing body in the radial direction. To do. As a result, the diameter of the bearing body is reduced, and the shaft member inserted into the bearing body is tightened. At this time, the protruding portion of the elastic member comes into contact with the inner peripheral surface of the housing and is bent and deformed. Deterioration of elastic bodies such as rubber and elastomers used for elastic members is generally more affected by compressive deformation than bending deformation. According to the present invention, a part of the compressive stress applied to the elastic member can be released by bending deformation, so that the amount of compressive deformation can be reduced by that amount, thereby improving the durability of the elastic member and making the slide bearing. The life can be extended.

図１は、本発明の第一実施の形態に係るラックブッシュ１が用いられた車両のステアリング機構の一部の部分断面図である。FIG. 1 is a partial cross-sectional view of a part of a steering mechanism of a vehicle in which the rack bush 1 according to the first embodiment of the present invention is used. 図２（Ａ）、図２（Ｂ）および図２（Ｃ）は、ラックブッシュ１の正面図、側面図および背面図である。2 (A), 2 (B) and 2 (C) are a front view, a side view and a rear view of the rack bush 1. 図３（Ａ）、図３（Ｂ）および図３（Ｃ）は、ブッシュ本体２の正面図、側面図および背面図であり、図３（Ｄ）および図３（Ｅ）は、図３（Ａ）に示すブッシュ本体２のＡ−Ａ断面図およびＢ−Ｂ断面図であり、図３（Ｆ）は、図３（Ａ）に示すブッシュ本体２のＣ部拡大図である。3 (A), 3 (B) and 3 (C) are front views, side views and rear views of the bush body 2, and FIGS. 3 (D) and 3 (E) are shown in FIG. 3 (E). AA cross-sectional view and BB cross-sectional view of the bush body 2 shown in A), FIG. 3 (F) is an enlarged view of a portion C of the bush body 2 shown in FIG. 3 (A). 図４（Ａ）、図４（Ｂ）および図４（Ｃ）は、弾性部材３の正面図、上面図および側面図であり、図４（Ｄ）は、図２（Ａ）のＤ部拡大図である。4 (A), 4 (B) and 4 (C) are a front view, a top view and a side view of the elastic member 3, and FIG. 4 (D) is an enlargement of the D portion of FIG. 2 (A). It is a figure. 図５（Ａ）、図５（Ｂ）および図５（Ｃ）は、本発明の第二実施の形態に係るラックブッシュ１’の正面図、側面図および背面図である。5 (A), 5 (B) and 5 (C) are a front view, a side view and a rear view of the rack bush 1'according to the second embodiment of the present invention. 図６（Ａ）、図６（Ｂ）および図６（Ｃ）は、弾性部材３ａの正面図、上面図および側面図であり、図６（Ｄ）は、図５（Ｂ）に示すＥ部の図５（Ｃ）に示すＦ方向矢視拡大図である。6 (A), 6 (B) and 6 (C) are front views, top views and side views of the elastic member 3a, and FIG. 6 (D) is a portion E shown in FIG. 5 (B). It is an enlarged view of the arrow in the F direction shown in FIG. 5 (C). 図７（Ａ）、図７（Ｂ）および図７（Ｃ）は、弾性部材３ｂの正面図、上面図および側面図であり、図７（Ｄ）は、図７（Ｃ）のＧ部拡大図である。7 (A), 7 (B) and 7 (C) are a front view, a top view and a side view of the elastic member 3b, and FIG. 7 (D) is an enlargement of the G portion of FIG. 7 (C). It is a figure. 図８は、弾性部材３ｃの上面図である。FIG. 8 is a top view of the elastic member 3c.

以下、本発明の実施の形態について、図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

［第一実施の形態］
図１は、本実施の形態に係るラックブッシュ１が用いられた車両のステアリング機構の一部の部分断面図である。 [First Embodiment]
FIG. 1 is a partial cross-sectional view of a part of the steering mechanism of the vehicle in which the rack bush 1 according to the present embodiment is used.

図示するように、本実施の形態に係るラックブッシュ１は、円筒状のハウジング４内に軸Ｏ方向の移動が規制された状態で収容され、ラック軸５の軸Ｏ方向の移動を許容しつつ、ラック軸５に加わる荷重を支持する。 As shown in the figure, the rack bush 1 according to the present embodiment is housed in the cylindrical housing 4 in a state where the movement in the axis O direction is restricted, and the rack shaft 5 is allowed to move in the axis O direction. , Supports the load applied to the rack shaft 5.

図２（Ａ）、図２（Ｂ）および図２（Ｃ）は、ラックブッシュ１の正面図、側面図および背面図である。 2 (A), 2 (B) and 2 (C) are a front view, a side view and a rear view of the rack bush 1.

図示するように、ラックブッシュ１は、ラック軸５が挿入される円筒状のブッシュ本体２と、ブッシュ本体２に装着された複数の弾性部材３と、を備えている。 As shown in the figure, the rack bush 1 includes a cylindrical bush body 2 into which the rack shaft 5 is inserted, and a plurality of elastic members 3 mounted on the bush body 2.

図３（Ａ）、図３（Ｂ）および図３（Ｃ）は、ブッシュ本体２の正面図、側面図および背面図であり、図３（Ｄ）および図３（Ｅ）は、図３（Ａ）に示すブッシュ本体２のＡ−Ａ断面図およびＢ−Ｂ断面図であり、図３（Ｆ）は、図３（Ａ）に示すブッシュ本体２のＣ部拡大図である。 3 (A), 3 (B) and 3 (C) are front views, side views and rear views of the bush body 2, and FIGS. 3 (D) and 3 (E) are shown in FIG. 3 (E). AA cross-sectional view and BB cross-sectional view of the bush body 2 shown in A), FIG. 3 (F) is an enlarged view of a portion C of the bush body 2 shown in FIG. 3 (A).

ブッシュ本体２は、ポリアセタール樹脂、ポリアミド樹脂、ポリエチレン樹脂等の摺動特性のよい合成樹脂で形成され、図示するように、内周面２０に形成され、挿入されたラック軸５の外周面５０と摺接する摺動面２１と、周方向に等間隔で交互に配置された複数の第一スリット２５および第二スリット２６と、外周面２２に形成された係合部２７と、弾性部材３を保持する複数の保持溝２８と、を備えている。 The bush body 2 is made of a synthetic resin having good sliding characteristics such as polyacetal resin, polyamide resin, polyethylene resin, etc., and is formed on the inner peripheral surface 20 and is inserted into the outer peripheral surface 50 of the rack shaft 5 as shown in the figure. Holds a sliding surface 21 that is in sliding contact, a plurality of first slits 25 and second slits 26 that are alternately arranged at equal intervals in the circumferential direction, an engaging portion 27 formed on the outer peripheral surface 22, and an elastic member 3. It is provided with a plurality of holding grooves 28 and the like.

第一スリット２５は、一方の端面２３から他方の端面２４に向けて軸Ｏ方向に沿って形成され、第二スリット２６は、他方の端面２４から一方の端面２３に向けて軸Ｏ方向に沿って形成されている。ブッシュ本体２は、周方向に等間隔で交互に配置された複数の第一スリット２５および第二スリット２６により、縮径方向に変形しやすくなっている。 The first slit 25 is formed along the axis O direction from one end face 23 toward the other end face 24, and the second slit 26 is formed along the axis O direction from the other end face 24 toward one end face 23. Is formed. The bush main body 2 is easily deformed in the diameter reduction direction by a plurality of first slits 25 and second slits 26 which are alternately arranged at equal intervals in the circumferential direction.

係合部２７は、一方の端面２３側において外周面２２から外方に突出し、ハウジング４の内周面４０に周方向に形成された環状溝４１に挿入される。これにより、ハウジング４内に収容されたラックブッシュ１の軸Ｏ方向の移動が規制される。 The engaging portion 27 projects outward from the outer peripheral surface 22 on one end surface 23 side, and is inserted into an annular groove 41 formed in the circumferential direction on the inner peripheral surface 40 of the housing 4. As a result, the movement of the rack bush 1 housed in the housing 4 in the axial O direction is restricted.

保持溝２８は、両端面２３、２４を貫くように軸Ｏ方向に沿って外周面２２に形成されている。また、保持溝２８は、底部２８０の溝幅Ｗ１が開口部２８１の溝幅Ｗ２より広くなるように形成されている。 The holding groove 28 is formed on the outer peripheral surface 22 along the axis O direction so as to penetrate both end surfaces 23 and 24. Further, the holding groove 28 is formed so that the groove width W1 of the bottom portion 280 is wider than the groove width W2 of the opening 281.

図４（Ａ）、図４（Ｂ）および図４（Ｃ）は、弾性部材３の正面図、上面図および側面図であり、図４（Ｄ）は、図２（Ａ）のＤ部拡大図である。 4 (A), 4 (B) and 4 (C) are a front view, a top view and a side view of the elastic member 3, and FIG. 4 (D) is an enlargement of the D portion of FIG. 2 (A). It is a figure.

弾性部材３は、ゴム、エラストマー等の弾性体で形成され、図示するように、被保持部３１と、被保持部３１の上面３１０に形成された一対の突出部３０ａ、３０ｂと、を備えている。 The elastic member 3 is formed of an elastic body such as rubber or elastomer, and includes a held portion 31 and a pair of protruding portions 30a and 30b formed on the upper surface 310 of the held portion 31 as shown in the figure. There is.

突出部３０ａ、３０ｂは、ラックブッシュ１において、ブッシュ本体２の外周面２２から外方に突出し、突出部３０ａ、３０ｂの頂点を結ぶ円Ｃの直径Ｄ１（図２（Ａ）参照）が、ハウジング４の内径Ｄ２（図１参照）に対してシメシロとなるように、被保持部３１の上面３１０からの突出量が設定されている。これにより、弾性部材３は、ラックブッシュ１をハウジング４内に収容した場合に、突出部３０ａ、３０ｂがハウジング４の内周面４０と当接して、ブッシュ本体２を径方向内方に付勢する。 The protrusions 30a and 30b project outward from the outer peripheral surface 22 of the bush body 2 in the rack bush 1, and the diameter D1 of the circle C connecting the vertices of the protrusions 30a and 30b (see FIG. 2A) is the housing. The amount of protrusion from the upper surface 310 of the held portion 31 is set so as to be squeezed with respect to the inner diameter D2 (see FIG. 1) of 4. As a result, when the rack bush 1 is housed in the housing 4, the elastic members 3 have the protrusions 30a and 30b in contact with the inner peripheral surface 40 of the housing 4 and urge the bush body 2 inward in the radial direction. To do.

また、図４（Ｄ）に示すように、弾性部材３の突出部３０ａ、３０ｂは、軸Ｏ方向に垂直な断面において、ブッシュ本体２の中心を通って径方向Ｒに延びる直線に対して周方向Ｓに傾斜している。このため、突出部３０ａ、３０ｂは、ラックブッシュ１をハウジング４内に収容した場合に、ハウジング４の内周面４０と当接して周方向Ｓに曲げ変形する。また、ブッシュ本体２の保持溝２８の開口部２８１は、弾性部材３の突出部３０ａ、３０ｂの周方向Ｓの両側に収容領域２８２ａ、２８２ｂを形成することのできる溝幅Ｗ２を有するように形成されている。ハウジング４の内周面４０と当接して曲げ変形した突出部３０ａ、３０ｂは、収容領域２８２ａ、２８２ｂに収容される。 Further, as shown in FIG. 4D, the protruding portions 30a and 30b of the elastic member 3 are circumferential with respect to a straight line extending in the radial direction R through the center of the bush body 2 in a cross section perpendicular to the axis O direction. It is inclined in the direction S. Therefore, when the rack bush 1 is housed in the housing 4, the protruding portions 30a and 30b come into contact with the inner peripheral surface 40 of the housing 4 and are bent and deformed in the circumferential direction S. Further, the opening 281 of the holding groove 28 of the bush body 2 is formed so as to have a groove width W2 capable of forming accommodating regions 282a and 282b on both sides of the protruding portions 30a and 30b of the elastic member 3 in the circumferential direction S. Has been done. The protruding portions 30a and 30b that are bent and deformed in contact with the inner peripheral surface 40 of the housing 4 are housed in the housing areas 282a and 282b.

被保持部３１は、ブッシュ本体２の保持溝２８の底部２８０と同形状であり、弾性部材３を軸Ｏ方向にスライドさせて、被保持部３１をブッシュ本体２の保持溝２８の底部２８０に挿入することにより、弾性部材３がブッシュ本体２の保持溝２８に保持される。ブッシュ本体２の保持溝２８は、底部２８０の溝幅Ｗ１が開口部２８１の溝幅Ｗ２より広くなるように形成されているため、この保持溝２８に保持された弾性部材３が径方向に抜け落ちるのを防止することができる。 The held portion 31 has the same shape as the bottom portion 280 of the holding groove 28 of the bush body 2, and the elastic member 3 is slid in the axial O direction to move the held portion 31 to the bottom portion 280 of the holding groove 28 of the bush body 2. By inserting, the elastic member 3 is held in the holding groove 28 of the bush body 2. Since the holding groove 28 of the bush body 2 is formed so that the groove width W1 of the bottom portion 280 is wider than the groove width W2 of the opening 281, the elastic member 3 held by the holding groove 28 falls off in the radial direction. Can be prevented.

以上、本発明の第一実施の形態について説明した。 The first embodiment of the present invention has been described above.

本実施の形態では、ラックブッシュ１を円筒状のハウジング４内に収容した場合に、弾性部材３の突出部３０ａ、３０ｂがハウジング４の内周面４０と当接して、ブッシュ本体２を径方向内方に付勢する。これにより、ブッシュ本体２が縮径して、ブッシュ本体２に挿入されたラック軸５を締め付ける。ここで、弾性部材３の突出部３０ａ、３０ｂは、軸Ｏ方向に垂直な断面において、径方向Ｒに対して周方向Ｓに傾斜しているので、この際、ハウジング４の内周面４０と当接して周方向Ｓに曲げ変形し、突出部３０ａ、３０ｂの周方向Ｓの両側に形成されたブッシュ本体２の保持溝２８の収容領域２８２ａ、２８２ｂに収容される。弾性部材３に用いられるゴム、エラストマー等の弾性体の劣化は、一般に、曲げ変形よりも圧縮変形の影響の方が大きい。本実施の形態によれば、ラックブッシュ１をハウジング４内に収容したときに弾性部材３に加わる圧縮応力の一部を突出部３０ａ、３０ｂの曲げ変形により逃がすことができるので、その分だけ圧縮変形量を小さくでき、これにより弾性部材３の耐久性を向上させて、ラックブッシュ１の長寿命化を図ることができる。 In the present embodiment, when the rack bush 1 is housed in the cylindrical housing 4, the protruding portions 30a and 30b of the elastic member 3 come into contact with the inner peripheral surface 40 of the housing 4 to bring the bush body 2 in the radial direction. Encourage inward. As a result, the bush body 2 is reduced in diameter, and the rack shaft 5 inserted into the bush body 2 is tightened. Here, since the protruding portions 30a and 30b of the elastic member 3 are inclined in the circumferential direction S with respect to the radial direction R in the cross section perpendicular to the axis O direction, at this time, the protrusions 30a and 30b of the elastic member 3 and the inner peripheral surface 40 of the housing 4 It abuts and is bent and deformed in the circumferential direction S, and is accommodated in the accommodating areas 282a and 282b of the holding grooves 28 of the bush body 2 formed on both sides of the projecting portions 30a and 30b in the circumferential direction S. Deterioration of elastic bodies such as rubber and elastomer used for the elastic member 3 is generally more affected by compressive deformation than bending deformation. According to the present embodiment, a part of the compressive stress applied to the elastic member 3 when the rack bush 1 is housed in the housing 4 can be released by bending deformation of the protrusions 30a and 30b, so that the amount of compression is reduced by that amount. The amount of deformation can be reduced, thereby improving the durability of the elastic member 3 and extending the life of the rack bush 1.

また、本実施の形態では、ブッシュ本体２の保持溝２８の底部２８０の溝幅Ｗ１を開口部２８１の溝幅Ｗ２より広くするとともに、弾性部材３の被保持部３１を、ブッシュ本体２の保持溝２８の底部２８０と同形状にして、この保持溝２８の底部２８０に挿入することにより、弾性部材３をブッシュ本体２の保持溝２８に保持させている。このため、ブッシュ本体２の保持溝２８に保持された弾性部材３が径方向に抜け落ちるのを防止することができる。 Further, in the present embodiment, the groove width W1 of the bottom 280 of the holding groove 28 of the bush main body 2 is made wider than the groove width W2 of the opening 281 and the held portion 31 of the elastic member 3 is held by the bush main body 2. The elastic member 3 is held in the holding groove 28 of the bush body 2 by having the same shape as the bottom 280 of the groove 28 and inserting it into the bottom 280 of the holding groove 28. Therefore, it is possible to prevent the elastic member 3 held in the holding groove 28 of the bush body 2 from falling off in the radial direction.

また、上記特許文献１に記載の滑り軸受は、ハウジング４に挿入された場合、軸Ｏ方向において点でハウジング４に支持されることとなり（弾性リングが１本なら１点支持、２本なら２点支持）、このため、軸受本体の外周面がハウジング４内で軸Ｏ方向に傾く可能性がある。この点、本実施の形態では、弾性部材３が軸Ｏ方向に延びているので、ハウジング４に挿入された場合に、軸Ｏ方向において線でハウジング４に支持されることとなり、したがって、ブッシュ本体２の外周面２２がハウジング４内で軸Ｏ方向に傾く可能性を低くすることができる。 Further, when the slide bearing described in Patent Document 1 is inserted into the housing 4, it is supported by the housing 4 at a point in the axial O direction (one elastic ring supports one point, and two elastic rings support two). (Point support), therefore, the outer peripheral surface of the bearing body may be tilted in the axial O direction in the housing 4. In this respect, in the present embodiment, since the elastic member 3 extends in the axis O direction, when it is inserted into the housing 4, it is supported by the housing 4 by a line in the axis O direction, and therefore, the bush main body. It is possible to reduce the possibility that the outer peripheral surface 22 of 2 is tilted in the axis O direction in the housing 4.

さらに、本実施の形態では、弾性部材３が曲げ変形を利用した形状であるため、形状の自由度が高く、剛性のコントロールがしやすいという利点がある。 Further, in the present embodiment, since the elastic member 3 has a shape utilizing bending deformation, there is an advantage that the degree of freedom of the shape is high and the rigidity can be easily controlled.

［第二実施の形態］
本実施の形態に係るラックブッシュ１’も、図１に示す第一実施の形態に係るラックブッシュ１と同様、円筒状のハウジング４内に軸Ｏ方向の移動が規制された状態で収容され、ラック軸５の軸Ｏ方向の移動を許容しつつ、ラック軸５に加わる荷重を支持する。 [Second Embodiment]
The rack bush 1'according to the present embodiment is also housed in the cylindrical housing 4 in a state where the movement in the axial O direction is restricted, like the rack bush 1 according to the first embodiment shown in FIG. It supports the load applied to the rack shaft 5 while allowing the rack shaft 5 to move in the axis O direction.

図５（Ａ）、図５（Ｂ）および図５（Ｃ）は、本発明の第二実施の形態に係るラックブッシュ１’の正面図、側面図および背面図である。 5 (A), 5 (B) and 5 (C) are a front view, a side view and a rear view of the rack bush 1'according to the second embodiment of the present invention.

本実施の形態に係るラックブッシュ１’が第一実施の形態に係るラックブッシュ１と異なる点は、弾性部材３に代えて弾性部材３ａを用いたことである。その他の構成は、第一実施の形態に係るラックブッシュ１と同様である。 The difference between the rack bush 1 ′ according to the present embodiment and the rack bush 1 according to the first embodiment is that the elastic member 3a is used instead of the elastic member 3. Other configurations are the same as those of the rack bush 1 according to the first embodiment.

図６（Ａ）、図６（Ｂ）および図６（Ｃ）は、弾性部材３ａの正面図、上面図および側面図であり、図６（Ｄ）は、図５（Ｂ）に示すＥ部の図５（Ｃ）に示すＦ方向矢視拡大図である。 6 (A), 6 (B) and 6 (C) are front views, top views and side views of the elastic member 3a, and FIG. 6 (D) is a portion E shown in FIG. 5 (B). It is an enlarged view of the arrow in the F direction shown in FIG. 5 (C).

弾性部材３ａが第一実施の形態に係るラックブッシュ１の弾性部材３と異なる点は、一対の係合用弾性部３２ａ、３２ｂを有することである。その他の構成は、第一実施の形態に係るラックブッシュ１の弾性部材３と同様である。 The elastic member 3a differs from the elastic member 3 of the rack bush 1 according to the first embodiment in that it has a pair of engaging elastic portions 32a and 32b. Other configurations are the same as those of the elastic member 3 of the rack bush 1 according to the first embodiment.

係合用弾性部３２ａ、３２ｂは、ブッシュ本体２の係合部２７側において、被保持部３１の上面３１０に突出部３０ａ、３０ｂを挟んで形成され、ブッシュ本体２の外周面２２から外方に突出する。そして、ブッシュ本体２の係合部２７とともに、ハウジング４の環状溝４１に挿入される。 The engaging elastic portions 32a and 32b are formed on the engaging portion 27 side of the bush body 2 with the protrusions 30a and 30b sandwiched between the upper surface 310 of the held portion 31 and outward from the outer peripheral surface 22 of the bush body 2. Protrude. Then, it is inserted into the annular groove 41 of the housing 4 together with the engaging portion 27 of the bush body 2.

係合用弾性部３２ａ、３２ｂの軸Ｏ方向の長さＬ１は、ブッシュ本体２の係合部２７の軸Ｏ方向の長さＬ２より長く、かつ、ハウジング４の環状溝４１の軸Ｏ方向の長さＬ３（図１参照）に対してシメシロとなるように設定されている。ただし、係合用弾性部３２ａ、３２ｂは、軸Ｏ方向において、少なくとも一方の端面がブッシュ本体２の係合部２７の端面から環状溝４１とシメシロとなるように突出する形状であれば、係合用弾性部３２ａ、３２ｂの軸Ｏ方向の長さＬ１が、ブッシュ本体２の係合部２７の軸Ｏ方向の長さＬ２より短くてもかまわない。 The length L1 of the engaging elastic portions 32a and 32b in the axis O direction is longer than the length L2 of the engaging portion 27 of the bush body 2 in the axis O direction, and the length of the annular groove 41 of the housing 4 in the axis O direction. It is set to be squeaky with respect to L3 (see FIG. 1). However, if the engaging elastic portions 32a and 32b have a shape in which at least one end surface protrudes from the end surface of the engaging portion 27 of the bush body 2 so as to form an annular groove 41 and a mesh in the axial O direction, the engaging elastic portions 32a and 32b are engaged. The length L1 of the elastic portions 32a and 32b in the axial O direction may be shorter than the length L2 of the engaging portion 27 of the bush body 2 in the axial O direction.

以上、本発明の第二実施の形態について説明した。 The second embodiment of the present invention has been described above.

本実施の形態では、係合用弾性部３２ａ、３２ｂを、軸Ｏ方向において、少なくとも一方の端面がブッシュ本体２の係合部２７の端面から突出する形状とし、かつ係合用弾性部３２ａ、３２ｂの軸Ｏ方向の長さＬ１を、ハウジング４の環状溝４１の軸Ｏ方向の長さＬ３に対してシメシロとなるように設定している。このため、ラックブッシュ１をハウジング４内に収容した場合に、ブッシュ本体２の係合部２７がハウジング４の環状溝４１の側面と接触・非接触を繰り返して異音を発生させるのを防止できる。その他の効果は、ハウジング４に挿入されたラックブッシュ１’のブッシュ本体２の外周面がハウジング４内で軸Ｏ方向に傾く可能性を低くできる効果を除き、本発明の第一実施の形態と同様である。 In the present embodiment, the engaging elastic portions 32a and 32b have a shape in which at least one end surface protrudes from the end surface of the engaging portion 27 of the bush body 2 in the axial O direction, and the engaging elastic portions 32a and 32b The length L1 in the axis O direction is set so as to be squeezed with respect to the length L3 in the axis O direction of the annular groove 41 of the housing 4. Therefore, when the rack bush 1 is housed in the housing 4, it is possible to prevent the engaging portion 27 of the bush body 2 from repeatedly contacting and not contacting the side surface of the annular groove 41 of the housing 4 to generate an abnormal noise. .. Other effects are the same as those of the first embodiment of the present invention, except for the effect that the outer peripheral surface of the bush body 2 of the rack bush 1'inserted into the housing 4 can be reduced in the housing 4 in the axial O direction. The same is true.

なお、本発明は、上記の各実施の形態に限定されるものではなく、その要旨の範囲内で数々の変形は可能である。 It should be noted that the present invention is not limited to each of the above embodiments, and many modifications can be made within the scope of the gist thereof.

例えば、上記の各実施の形態では、弾性部材３、３ａの突出部３０ａ、３０ｂを、軸Ｏ方向に垂直な断面において、径方向Ｒに対して周方向Ｓに傾斜させている（図４（Ｄ）参照）。しかし、本発明はこれに限定されない。弾性部材３、３ａの突出部３０ａ、３０ｂは、径方向Ｒに対して傾斜しながらブッシュ本体２の外周面２２から外方に突出したものであればよい。例えば、図７に示す弾性部材３ｂのように、軸Ｏ方向の断面において、径方向Ｒに対して軸Ｏ方向に傾斜した突出部３０ｃを、軸Ｏ方向に沿って被保持部３１の上面３１０に複数設けてもよい。この場合、ハウジング４の内周面４０と当接して曲げ変形した突出部３０ｃが収容される収容領域２８２ｃを有するように、所定の間隔を空けて突出部３０ｃを設けることが好ましい。 For example, in each of the above embodiments, the protruding portions 30a and 30b of the elastic members 3 and 3a are inclined in the circumferential direction S with respect to the radial direction R in the cross section perpendicular to the axis O direction (FIG. 4 (FIG. 4). See D)). However, the present invention is not limited to this. The protruding portions 30a and 30b of the elastic members 3 and 3a may be those that protrude outward from the outer peripheral surface 22 of the bush body 2 while being inclined with respect to the radial direction R. For example, like the elastic member 3b shown in FIG. 7, in the cross section in the axis O direction, the protruding portion 30c inclined in the axis O direction with respect to the radial direction R is formed on the upper surface 310 of the held portion 31 along the axis O direction. May be provided in plurality. In this case, it is preferable to provide the protrusions 30c at predetermined intervals so as to have a storage area 282c in which the protrusions 30c that are bent and deformed in contact with the inner peripheral surface 40 of the housing 4 are accommodated.

また、上記の各実施の形態において、ブッシュ本体２の保持溝２８の底部２８０の両端部における溝幅を、その両端部に挟まれた中央部の溝幅よりも広く、かつ、いずれか一方の端面２３、２４側の端部の溝幅をその端面２３、２４に近づくにつれて狭くなるように傾斜させ、これに併せて、図８に示す弾性部材３ｃのように、被保持部３１の両端部３１１ａ、３１１ｂにおける幅を両端部３１１ａ、３１１ｂに挟まれた中央部３１２の幅より広く、かつ一方の端部３１１ａの幅を端面３１３に近づくにつれて狭くなうように傾斜させてもよい。そして、端部３１１ａを先頭にして、被保持部３１をブッシュ本体２の保持溝２８の底部２８０に挿入することにより、弾性部材３をブッシュ本体２の保持溝２８に保持させてもよい。このようにすることで、弾性部材３ｃが軸Ｏ方向にスライドしてブッシュ本体２の保持溝２８から軸Ｏ方向に抜け落ちるのを防止することができる。 Further, in each of the above embodiments, the groove width at both ends of the bottom 280 of the holding groove 28 of the bush body 2 is wider than the groove width of the central portion sandwiched between the both ends, and one of them is used. The groove width of the end portions on the end faces 23 and 24 side is inclined so as to become narrower as it approaches the end faces 23 and 24, and at the same time, both ends of the held portion 31 are formed as in the elastic member 3c shown in FIG. The width of the 311a and 311b may be wider than the width of the central portion 312 sandwiched between the both end portions 311a and 311b, and the width of one end portion 311a may be inclined so as to become narrower as it approaches the end surface 313. Then, the elastic member 3 may be held in the holding groove 28 of the bush main body 2 by inserting the held portion 31 into the bottom portion 280 of the holding groove 28 of the bush main body 2 with the end portion 311a at the head. By doing so, it is possible to prevent the elastic member 3c from sliding in the shaft O direction and falling out of the holding groove 28 of the bush body 2 in the shaft O direction.

また、上記の各実施の形態では、ブッシュ本体２の保持溝２８をブッシュ本体２の外周面２２に軸Ｏ方向に沿って形成し、弾性部材３、３ａ〜３ｃを、直線状に形成して、この保持溝２８に保持させている。しかし、本発明はこれに限定されない。例えば、保持溝をブッシュ本体２の外周面２２に周方向に沿って環状に形成し、この保持溝に、軸Ｏ方向の断面あるいは軸Ｏ方向に垂直な断面において、ブッシュ本体２の径方向に対して傾斜しながら外周面２２から外方に突出して、ハウジング４の内周面４０と当接する突出部を有する環状の弾性部材を装着してもよい。 Further, in each of the above embodiments, the holding groove 28 of the bush body 2 is formed on the outer peripheral surface 22 of the bush body 2 along the axis O direction, and the elastic members 3, 3a to 3c are formed linearly. , It is held in this holding groove 28. However, the present invention is not limited to this. For example, a holding groove is formed in an annular shape on the outer peripheral surface 22 of the bush body 2 along the circumferential direction, and the holding groove is formed in a cross section in the axis O direction or a cross section perpendicular to the axis O direction in the radial direction of the bush body 2. An annular elastic member having a protruding portion that protrudes outward from the outer peripheral surface 22 while inclining with respect to the inner peripheral surface 40 of the housing 4 may be attached.

また、上記の各実施の形態では、ブッシュ本体２に、一方の端面２３から他方の端面２４に向けて複数の第一スリット２５を軸Ｏ方向に沿って形成するとともに、他方の端面２４から一方の端面２３に向けて複数の第二スリット２６を軸Ｏ方向に沿って形成している。しかし、本発明はこれに限定されない。ブッシュ本体２は、径方向に伸縮可能な筒形状を有するものであればよい。例えば、いずれか一方の端面から他方の端面に向けて軸Ｏ方向に沿って形成されたスリットを備えることにより、径方向に伸縮可能としたものでもよし、あるいは、スリットの代わりに肉薄部を設けることにより、径方向に伸縮可能としたものでもよい。 Further, in each of the above embodiments, a plurality of first slits 25 are formed in the bush body 2 from one end face 23 toward the other end face 24 along the axis O direction, and one from the other end face 24. A plurality of second slits 26 are formed along the axis O direction toward the end surface 23 of the above. However, the present invention is not limited to this. The bush body 2 may have a tubular shape that can be expanded and contracted in the radial direction. For example, a slit formed along the axis O direction from one end face to the other end face may be provided so that the slit can be expanded and contracted in the radial direction, or a thin portion is provided instead of the slit. As a result, it may be expandable and contractible in the radial direction.

また、上記の各実施の形態では、ブッシュ本体２の形状を円筒状としているが、挿入されるラック軸５の形状に適合する筒形状であればよい。また、本実施の形態では、ブッシュ本体２と弾性部材３、３ａ〜３ｃとを別材質で形成しているが、両者を同じ材質で形成してもよい。 Further, in each of the above embodiments, the shape of the bush body 2 is cylindrical, but it may be a cylindrical shape that matches the shape of the rack shaft 5 to be inserted. Further, in the present embodiment, the bush body 2 and the elastic members 3, 3a to 3c are made of different materials, but both may be made of the same material.

また、本発明はラックブッシュに限定されない。本発明は軸部材の軸方向の移動および回転の少なくとも一方を許容しつつ、この軸部材に加わる荷重を支持する滑り軸受に広く適用可能である。例えば、本発明は、ステアリングコラムの回転を許容しつつ、ステアリングコラムに加わる荷重を支持するステアリングコラムブッシュに適用することができる。 Further, the present invention is not limited to rack bushes. The present invention is widely applicable to plain bearings that support a load applied to the shaft member while allowing at least one of axial movement and rotation of the shaft member. For example, the present invention can be applied to a steering column bush that supports a load applied to the steering column while allowing the steering column to rotate.

１、１’：ラックブッシュ、 ２：ブッシュ本体、 ３、３ａ〜３ｃ：弾性部材、 ４：ハウジング、 ５：ラック軸、２０：ブッシュ本体２の内周面、 ２１：ブッシュ本体２の摺動面、 ２２：ブッシュ本体２の外周面、 ２３、２４：ブッシュ本体２の端面、 ２５：第一スリット、 ２６：第二スリット、 ２７：係合部、 ２８：保持溝、 ３０ａ〜３０ｃ：突出部、 ３１：被保持部、 ３２ａ、３２ｂ：係合用弾性部、 ４０：ハウジング４の内周面、 ４１：環状溝、 ５０：ラック軸５の外周面、 ２８０：保持溝２８の底部、 ２８１：保持溝２８の開口部、 ２８２ａ〜２８２ｃ：収容領域、 ３１０：被保持部３１の上面、 ３１３：弾性部材３ｃの端面 1, 1': Rack bush, 2: Bush body, 3, 3a to 3c: Elastic member, 4: Housing, 5: Rack shaft, 20: Inner peripheral surface of bush body 2, 21: Sliding surface of bush body 2 , 22: Bush body 2 outer peripheral surface, 23, 24: Bush body 2 end surface, 25: First slit, 26: Second slit, 27: Engagement part, 28: Holding groove, 30a to 30c: Projection part, 31: Held part, 32a, 32b: Elastic part for engagement, 40: Inner peripheral surface of housing 4, 41: Circular groove, 50: Outer surface of rack shaft 5, 280: Bottom of holding groove 28, 281: Holding groove 28 openings, 282a to 282c: accommodation area, 310: upper surface of held portion 31, 313: end face of elastic member 3c

Claims (7)

筒状のハウジング内に収容され、軸部材の軸方向の移動および回転の少なくとも一方を許容しつつ、前記軸部材に加わる荷重を支持する滑り軸受であって、
径方向に伸縮可能な筒状の軸受本体と、
前記軸受本体に装着され、前記軸受本体の径方向に対して傾斜しながら前記軸受本体の外周面から外方に突出する突出部を有する弾性部材と、を備え、
前記軸受本体は、
一方の端部において外周面から外方に突出して、前記ハウジングの内周面に周方向に形成された環状溝に挿入される係合部を有し、
前記弾性部材は、
前記軸受本体の前記係合部とともに前記ハウジングの前記環状溝に挿入され、当該環状溝の側面と当接する係合用弾性部をさらに有し、
前記滑り軸受を前記ハウジング内に収容した場合に、前記突出部が前記ハウジングの内周面と当接して、前記軸受本体を径方向内方に付勢する
ことを特徴とする滑り軸受。 A plain bearing housed in a tubular housing that supports a load applied to the shaft member while allowing at least one of axial movement and rotation of the shaft member.
A tubular bearing body that can expand and contract in the radial direction,
An elastic member mounted on the bearing body and having a protruding portion protruding outward from the outer peripheral surface of the bearing body while being inclined with respect to the radial direction of the bearing body.
The bearing body
At one end, it has an engaging portion that projects outward from the outer peripheral surface and is inserted into an annular groove formed in the circumferential direction on the inner peripheral surface of the housing.
The elastic member is
It further has an engaging elastic portion that is inserted into the annular groove of the housing together with the engaging portion of the bearing body and abuts on the side surface of the annular groove .
A slide bearing characterized in that when the slide bearing is housed in the housing, the protruding portion abuts on the inner peripheral surface of the housing to urge the bearing body inward in the radial direction . 請求項１に記載の滑り軸受であって
前記軸受本体は、
一方の端面から他方の端面に向けて軸方向に沿って形成されたスリットをさらに有する
ことを特徴とする滑り軸受。 The slide bearing according to claim 1, wherein the bearing body is
A plain bearing characterized by further having slits formed along the axial direction from one end face to the other end face. 請求項１または２に記載の滑り軸受であって、
前記軸受本体は、
外周面に形成され、底部の溝幅が開口部の溝幅より広い保持溝をさらに有し、
前記弾性部材は、
前記軸受本体の前記保持溝に収容され、当該保持溝と同形状の被保持部をさらに有する
ことを特徴とする滑り軸受。 The slide bearing according to claim 1 or 2 .
The bearing body
Further having a holding groove formed on the outer peripheral surface and having a groove width at the bottom wider than the groove width of the opening.
The elastic member is
A slide bearing that is housed in the holding groove of the bearing body and further has a held portion having the same shape as the holding groove. 径方向に伸縮可能な筒状の軸受本体と、
前記軸受本体に装着され、前記軸受本体の径方向に対して傾斜しながら前記軸受本体の外周面から外方に突出する突出部を有する弾性部材と、を備え、
前記軸受本体は、
外周面に形成され、底部の溝幅が開口部の溝幅より広い保持溝を有し、
前記弾性部材は、
前記軸受本体の前記保持溝に収容され、当該保持溝と同形状の被保持部をさらに有する
ことを特徴とする滑り軸受。 A tubular bearing body that can expand and contract in the radial direction,
An elastic member mounted on the bearing body and having a protruding portion protruding outward from the outer peripheral surface of the bearing body while being inclined with respect to the radial direction of the bearing body.
The bearing body
It is formed on the outer peripheral surface and has a holding groove whose bottom groove width is wider than the groove width of the opening.
The elastic member is
A slide bearing that is housed in the holding groove of the bearing body and further has a held portion having the same shape as the holding groove. 請求項４に記載の滑り軸受であって
前記軸受本体は、
一方の端面から他方の端面に向けて軸方向に沿って形成されたスリットをさらに有する
ことを特徴とする滑り軸受。 The slide bearing according to claim 4 , wherein the bearing body is
A plain bearing characterized by further having slits formed along the axial direction from one end face to the other end face. 請求項３ないし５のいずれか一項に記載の滑り軸受であって、
前記軸受本体の前記保持溝および前記弾性部材の前記被保持部は、
前記軸受本体の一方の端面から他方の端面に向けて軸方向に沿って形成され、両端部の溝幅が当該両端部に挟まれた中間部の溝幅より広く、かつ一方の端面側の溝幅が当該一方の端面に近づくにつれて狭くなる
ことを特徴とする滑り軸受。 The slide bearing according to any one of claims 3 to 5 .
The holding groove of the bearing body and the held portion of the elastic member are
A groove formed along the axial direction from one end face of the bearing body to the other end face, the groove width of both ends is wider than the groove width of the intermediate portion sandwiched between the both ends, and the groove on one end face side. A plain bearing characterized in that its width narrows as it approaches one of the end faces. 請求項３ないし６のいずれか一項に記載の滑り軸受であって、
前記軸受本体の前記保持溝は、
前記弾性部材の曲げ変形した前記突出部を収容する収容領域を有する
ことを特徴とする滑り軸受。 The slide bearing according to any one of claims 3 to 6 .
The holding groove of the bearing body
A slide bearing having a storage area for accommodating the bent and deformed protruding portion of the elastic member.
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