JP4970763B2 - BEARING DEVICE AND STEERING DEVICE PROVIDED WITH BEARING DEVICE - Google Patents

BEARING DEVICE AND STEERING DEVICE PROVIDED WITH BEARING DEVICE Download PDF

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JP4970763B2
JP4970763B2 JP2005272893A JP2005272893A JP4970763B2 JP 4970763 B2 JP4970763 B2 JP 4970763B2 JP 2005272893 A JP2005272893 A JP 2005272893A JP 2005272893 A JP2005272893 A JP 2005272893A JP 4970763 B2 JP4970763 B2 JP 4970763B2
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peripheral surface
outer cylinder
cylinder
bearing device
housing
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JP2007083790A (en
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健仁 冨田
耕造 藤田
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JTEKT Corp
Toyota Motor Corp
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Toyota Motor Corp
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Description

この発明は、軸受装置および軸受装置を備えたステアリング装置に関するものである。   The present invention relates to a bearing device and a steering device including the bearing device.

ラックピニオン式ステアリング装置は、通例、ステアリングホイール等の操舵部材の回転により軸長方向に移動するラック軸と、ラック軸を収容するハウジングとを備える。ラック軸は、ハウジングに保持された軸受装置によって、ハウジング内において摺動自在に支持されている。
軸受装置には、ラック軸を摺動自在に支持する筒状のブッシュと、ブッシュとハウジングとの間に介在した弾性部材とを含むものがある（例えば、特許文献１）。
特開２００４−１８３７８０号公報 A rack-and-pinion type steering apparatus typically includes a rack shaft that moves in the axial direction by rotation of a steering member such as a steering wheel, and a housing that houses the rack shaft. The rack shaft is slidably supported in the housing by a bearing device held in the housing.
Some bearing devices include a cylindrical bush that slidably supports a rack shaft, and an elastic member interposed between the bush and the housing (for example, Patent Document 1).
JP 2004-183780 A

しかしながら、特許文献１記載の発明では、ブッシュおよび弾性部材が、ハウジングに対して、ラック軸と共に軸長方向に移動してしまう場合がある。このような場合、軸受装置がハウジングから抜けるおそれがある。また、ハウジング内にストッパを設けて軸受装置の移動を規制しても、軸受装置がストッパに当たった際にラック軸の摺動荷重が急激に変動するおそれがある。さらに、ハウジングおよびブッシュに対する弾性部材の締め代を大きくすると、ブッシュおよび弾性部材の移動を規制できるが、ラック軸の摺動抵抗が大きくなる。   However, in the invention described in Patent Document 1, the bush and the elastic member may move in the axial length direction together with the rack shaft with respect to the housing. In such a case, the bearing device may come off the housing. Even if a stopper is provided in the housing to restrict the movement of the bearing device, the sliding load of the rack shaft may fluctuate rapidly when the bearing device hits the stopper. Further, when the tightening margin of the elastic member with respect to the housing and the bush is increased, the movement of the bush and the elastic member can be restricted, but the sliding resistance of the rack shaft is increased.

この発明は、かかる背景のもとになされたものであり、ラック軸の径方向の支持剛性および軸長方向の良好な摺動特性を有し、ハウジングに対する移動が規制された軸受装置ならびに軸受装置を備えたステアリング装置を提供することを目的とする。   The present invention has been made based on such background, and has a bearing rigidity and a good sliding characteristic in the radial direction of the rack shaft in the radial direction, and the movement with respect to the housing is restricted, and the bearing apparatus. It aims at providing the steering device provided with.

上記目的を達成するため、軸部材（６）を摺動自在に支持する内筒（１３）と、内筒を、径方向（Ａ１）に所定の隙間（ｗ）を設けて取り囲む外筒（１４）と、内筒と外筒との間に、径方向に弾性的に圧縮された状態で介在する環状の弾性部材（１５）とを備え、内筒は、周方向（Ｚ１）と交差する方向に延びるスリット（２０）を有していて弾性的に縮径可能であり、内筒の外周面（１６ａ）および外筒の内周面（１４ｂ）に、互いに対向して上記弾性部材を収容した環状溝（１８ａ，１８ｂ，２３ａ，２３ｂ）がそれぞれ形成されており、外筒の外周面（１４ａ）が、ハウジング（７）の保持孔（１２）の内周面（２４ｂ）に嵌め合わされて保持されており、外筒の外周面とハウジングの保持孔の内周面との摩擦係数は、内筒の内周面と軸部材の外周面との摩擦係数よりも大きいことを特徴とする軸受装置（１１）である。   To achieve the above object, an inner cylinder (13) that slidably supports the shaft member (6) and an outer cylinder (14) surrounding the inner cylinder with a predetermined gap (w) in the radial direction (A1). ) And an annular elastic member (15) interposed between the inner cylinder and the outer cylinder in an elastically compressed state in the radial direction, and the inner cylinder intersects the circumferential direction (Z1). The elastic member is accommodated on the outer peripheral surface (16a) of the inner cylinder and the inner peripheral surface (14b) of the outer cylinder so as to oppose each other. The annular grooves (18a, 18b, 23a, 23b) are formed, respectively, and the outer peripheral surface (14a) of the outer cylinder is fitted and held in the inner peripheral surface (24b) of the holding hole (12) of the housing (7). The friction coefficient between the outer peripheral surface of the outer cylinder and the inner peripheral surface of the holding hole of the housing is the same as that of the inner peripheral surface of the inner cylinder. Bearing device being larger than the friction coefficient between the outer peripheral surface of the member is (11).

本発明によれば、外筒の外周面とハウジングの保持孔の内周面との摩擦係数を内筒の内周面と軸部材の外周面との摩擦係数よりも大きくすることにより、軸受装置のハウジングに対する移動を規制することができる。これにより、軸部材の良好な摺動特性を得ることができる。
請求項２記載の発明は、車両の左右方向（Ｘ１）に延びる、軸部材としての転舵軸（６）と、転舵軸を軸長方向（Ｙ１）に摺動自在に支持する請求項１記載の軸受装置と、軸受装置を保持する保持孔を有するハウジングとを備えるステアリング装置（１）である。 According to the present invention, the friction coefficient between the outer peripheral surface of the outer cylinder and the inner peripheral surface of the holding hole of the housing is made larger than the friction coefficient between the inner peripheral surface of the inner cylinder and the outer peripheral surface of the shaft member. The movement with respect to the housing can be restricted. Thereby, the favorable sliding characteristic of a shaft member can be acquired.
The invention according to claim 2 supports the steered shaft (6) as a shaft member extending in the left-right direction (X1) of the vehicle, and supports the steered shaft slidably in the axial length direction (Y1). A steering device (1) including the bearing device described above and a housing having a holding hole for holding the bearing device.

本発明によれば、請求項１記載の軸受装置をステアリング装置に用いることにより、転舵軸の良好な摺動特性を得ることができる。
なお、上記において、括弧内の英数字は、後述の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。 According to the present invention, by using the bearing device according to claim 1 for a steering device, it is possible to obtain good sliding characteristics of the steered shaft.
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.

以下には、図面を参照して、この発明の実施形態について具体的に説明する。
図１は、本発明の一実施形態にかかるラックピニオン式ステアリング装置を模式的に示した概略図である。図１を参照して、ラックピニオン式ステアリング装置１は、ステアリングホイール２が連結された入力軸３と、ピニオン４が形成された出力軸５と、ピニオン４と噛み合う転舵軸としてのラック軸６と、ラック軸６が挿通されたハウジング７とを備える。 Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a schematic view schematically showing a rack and pinion type steering apparatus according to an embodiment of the present invention. Referring to FIG. 1, a rack and pinion type steering apparatus 1 includes an input shaft 3 to which a steering wheel 2 is connected, an output shaft 5 on which a pinion 4 is formed, and a rack shaft 6 as a steered shaft that meshes with the pinion 4. And a housing 7 through which the rack shaft 6 is inserted.

入力軸３と出力軸５とは、トーションバー８を介して同軸上に連結されている。入力軸３と出力軸５とは、ステアリングホイール２から与えられる操舵トルクに応じて、トーションバー８の弾性的なねじりを伴って相対回転する。
ラック軸６は、図示しない車両の左右方向Ｘ１（図１における左右方向）に延びており、ハウジング７内においてピニオン４と噛み合っている。ラック軸６の両端は、タイロッド９がそれぞれ連結されている。このタイロッド９は、ナックルアーム１０を介して車輪１０ａにそれぞれ連結されている。また、ラック軸６は、ラック軸６のラック歯と反対側の周面を移動可能に支持する図示しないラックヨークと、ハウジング７に保持された軸受装置１１によって、ラック軸６の軸長方向Ｙ１に摺動自在に支持されている。 The input shaft 3 and the output shaft 5 are connected coaxially via a torsion bar 8. The input shaft 3 and the output shaft 5 rotate relative to each other with elastic torsion of the torsion bar 8 according to the steering torque applied from the steering wheel 2.
The rack shaft 6 extends in the left-right direction X1 (left-right direction in FIG. 1) of the vehicle (not shown), and meshes with the pinion 4 in the housing 7. Tie rods 9 are respectively connected to both ends of the rack shaft 6. The tie rods 9 are connected to the wheels 10a through knuckle arms 10, respectively. Further, the rack shaft 6 includes a rack yoke (not shown) that movably supports a peripheral surface of the rack shaft 6 opposite to the rack teeth, and a bearing device 11 that is held by the housing 7. It is slidably supported by.

ステアリングホイール２に操舵トルクが与えられ、ピニオン４が回動する。これにより、ピニオン４と噛み合うラック軸６が軸長方向Ｙ１に移動させられ、車輪の操舵角度が変化する。
次に、ラック軸６を支持する軸受装置１１について詳細に説明する。
図２は、図１における軸受装置およびその周辺を概略的に示す一部断面拡大図であり、図３は、自由状態における軸受装置のブッシュを概略的に示す断面図である。図２を参照して、軸受装置１１は、ラック軸６が挿通された状態で、ハウジング７に形成された保持孔１２に保持されている。また、軸受装置１１は、周方向に有端である内筒としてのブッシュ１３と、周方向に無端である外筒１４と、ブッシュ１３と外筒１４との間に介在した一対の環状の弾性部材１５とを含む。 Steering torque is applied to the steering wheel 2 and the pinion 4 rotates. As a result, the rack shaft 6 that meshes with the pinion 4 is moved in the axial direction Y1, and the steering angle of the wheel changes.
Next, the bearing device 11 that supports the rack shaft 6 will be described in detail.
FIG. 2 is an enlarged partial cross-sectional view schematically showing the bearing device and its periphery in FIG. 1, and FIG. 3 is a cross-sectional view schematically showing a bush of the bearing device in a free state. With reference to FIG. 2, the bearing device 11 is held in a holding hole 12 formed in the housing 7 in a state where the rack shaft 6 is inserted. Further, the bearing device 11 includes a bush 13 as an inner cylinder that is endless in the circumferential direction, an outer cylinder 14 that is endless in the circumferential direction, and a pair of annular elastic members interposed between the bush 13 and the outer cylinder 14. Member 15.

内筒としてのブッシュ１３は、合成樹脂製であり、円筒状の本体１６と、本体１６の一端から径方向Ａ１外方に突き出した環状フランジ１７とを含む。本体１６の外周面１６ａに、本体１６の周方向Ｚ１に延びた一対の環状溝１８ａ，１８ｂが形成されている。本体１６を軸方向Ｂ１に貫く挿通孔１９に、ラック軸６が挿通され支持されている。挿通孔１９の径Ｄ１は、図３に示すように、ブッシュ１３の自由状態において、ラック軸６の外径Ｄ２よりも大径となっている。   The bush 13 as an inner cylinder is made of synthetic resin, and includes a cylindrical main body 16 and an annular flange 17 protruding outward from the one end of the main body 16 in the radial direction A1. A pair of annular grooves 18 a and 18 b extending in the circumferential direction Z <b> 1 of the main body 16 are formed on the outer peripheral surface 16 a of the main body 16. The rack shaft 6 is inserted into and supported by an insertion hole 19 that penetrates the main body 16 in the axial direction B1. As shown in FIG. 3, the diameter D <b> 1 of the insertion hole 19 is larger than the outer diameter D <b> 2 of the rack shaft 6 in the free state of the bush 13.

また、本体１６には、単一のスリット（すり割り）２０が形成され、これにより、本体１６は、スリット２０を周方向Ｚ１に挟んだ両側に一対の端部１６ｃを有している。具体的には、スリット２０は、本体１６の軸方向Ｂ１の一端から他端にかけて延びており、本体１６の軸方向Ｂ１に延びる一対の軸方向部２１と、本体１６の周方向Ｚ１と交差する方向に延びる傾斜部２２とを有する。一対の軸方向部２１は、本体１６の軸方向Ｂ１の両端からそれぞれ延びており、傾斜部２２を介して互いに接続されている。   In addition, a single slit (slit) 20 is formed in the main body 16, whereby the main body 16 has a pair of end portions 16 c on both sides sandwiching the slit 20 in the circumferential direction Z <b> 1. Specifically, the slit 20 extends from one end to the other end in the axial direction B1 of the main body 16 and intersects with a pair of axial portions 21 extending in the axial direction B1 of the main body 16 and the circumferential direction Z1 of the main body 16. And an inclined portion 22 extending in the direction. The pair of axial portions 21 extend from both ends in the axial direction B1 of the main body 16 and are connected to each other via the inclined portion 22.

スリット２０によって、ブッシュ１３が弾性的に変形して、ブッシュ１３の外径および内径が変化する。また、ラック軸６がブッシュ１３の挿通孔１９に挿通された状態において、スリット２０の間隔（スリット幅）ｔを調整することにより、ブッシュ１３の内周面１６ｂとラック軸６の外周面６ａとの間の径方向Ａ１の隙間が無くなり、ブッシュ１３の内周面１６ｂがラック軸６の外周面６ａに沿う。   The bush 13 is elastically deformed by the slit 20, and the outer diameter and inner diameter of the bush 13 change. Further, in the state where the rack shaft 6 is inserted into the insertion hole 19 of the bush 13, the inner peripheral surface 16 b of the bush 13 and the outer peripheral surface 6 a of the rack shaft 6 are adjusted by adjusting the interval (slit width) t of the slit 20. And the inner peripheral surface 16b of the bush 13 is along the outer peripheral surface 6a of the rack shaft 6.

再び図２を参照して、外筒１４は、円筒状に形成されている。外筒１４の内周面１４ｂには、外筒１４の周方向Ｚ１に延びた一対の環状溝２３ａ，２３ｂが形成されている。また、外筒１４は、外筒１４の外周面１４ａとハウジング７の内周面２４ｂとの摩擦係数がブッシュ１３の本体１６の内周面１６ｂとラック軸６の外周面６ａとの摩擦係数よりも大きくなる材料（例えば、金属）で形成されている。   Referring to FIG. 2 again, the outer cylinder 14 is formed in a cylindrical shape. A pair of annular grooves 23 a and 23 b extending in the circumferential direction Z <b> 1 of the outer cylinder 14 are formed on the inner peripheral surface 14 b of the outer cylinder 14. Further, the outer cylinder 14 has a friction coefficient between the outer peripheral surface 14 a of the outer cylinder 14 and the inner peripheral surface 24 b of the housing 7 based on the friction coefficient between the inner peripheral surface 16 b of the main body 16 of the bush 13 and the outer peripheral surface 6 a of the rack shaft 6. It is made of a material (for example, metal) that becomes larger.

ハウジング７に形成された保持孔１２は、小径部２４と、小径部２４よりも大径の大径部２５とを含む。小径部２４の軸方向の長さは、外筒１４の軸方向の長さよりも長く、小径部２４の外径は、外筒１４の外径と略等しい大きさとなっている。大径部２５の軸方向の長さは、環状フランジ１７の板厚よりも大きく、大径部２５の外径は、環状フランジ１７の外径よりも大きい。また、ハウジング７には、保持孔１２の軸方向の外側（図２においては右側）において、大径部２５よりも大径の係合部２６が形成されている。この係合部２６に、ラック軸６が挿通された環状のストッパ２７の外周面が圧入により係合され固定されている。   The holding hole 12 formed in the housing 7 includes a small diameter portion 24 and a large diameter portion 25 having a larger diameter than the small diameter portion 24. The axial length of the small diameter portion 24 is longer than the axial length of the outer cylinder 14, and the outer diameter of the small diameter portion 24 is substantially equal to the outer diameter of the outer cylinder 14. The length of the large diameter portion 25 in the axial direction is larger than the plate thickness of the annular flange 17, and the outer diameter of the large diameter portion 25 is larger than the outer diameter of the annular flange 17. Further, the housing 7 is formed with an engaging portion 26 having a diameter larger than that of the large diameter portion 25 on the outer side in the axial direction of the holding hole 12 (right side in FIG. 2). An outer peripheral surface of an annular stopper 27 through which the rack shaft 6 is inserted is engaged and fixed to the engaging portion 26 by press-fitting.

ブッシュ１３の環状フランジ１７は、保持孔１２の大径部２５内に収容されている。外筒１４は、外筒１４の外周面１４ａと保持孔１２の小径部２４の内周面２４ｂとが嵌合することにより小径部２４に保持されている。また、外筒１４の内周面１４ｂとブッシュ１３の本体１６の外周面１６ａとの間には、所定の隙間ｗが設けられ、外筒１４の内周面１４ｂに形成された一対の環状溝２３ａ，２３ｂとブッシュ１３の本体１６の外周面１６ａに形成された一対の環状溝１８ａ，１８ｂとはそれぞれ対向するように配置されている。一対の弾性部材１５は、それぞれ対向する環状溝１８ａ，２３ａおよび環状溝１８ｂ，２３ｂの間に、径方向Ａ１に弾性変形された状態でそれぞれ収容されている。各弾性部材１５は、ブッシュ１３および外筒１４の双方に対して締め代を持っている。ブッシュ１３は、環状溝１８ａ，２３ａおよび環状溝１８ｂ，２３ｂの間にそれぞれ収容された一対の弾性部材１５を介して外筒１４に保持されている。   The annular flange 17 of the bush 13 is accommodated in the large diameter portion 25 of the holding hole 12. The outer cylinder 14 is held by the small diameter portion 24 by fitting the outer peripheral surface 14 a of the outer cylinder 14 and the inner peripheral surface 24 b of the small diameter portion 24 of the holding hole 12. A predetermined gap w is provided between the inner peripheral surface 14 b of the outer cylinder 14 and the outer peripheral surface 16 a of the main body 16 of the bush 13, and a pair of annular grooves formed on the inner peripheral surface 14 b of the outer cylinder 14. 23a, 23b and a pair of annular grooves 18a, 18b formed on the outer peripheral surface 16a of the body 16 of the bush 13 are arranged so as to face each other. The pair of elastic members 15 are respectively accommodated between the annular grooves 18a and 23a and the annular grooves 18b and 23b facing each other in a state of being elastically deformed in the radial direction A1. Each elastic member 15 has an allowance for both the bush 13 and the outer cylinder 14. The bush 13 is held by the outer cylinder 14 via a pair of elastic members 15 housed between the annular grooves 18a and 23a and the annular grooves 18b and 23b.

このようにして、軸受装置１１では、外筒１４および一対の弾性部材１５を介して保持孔１２に保持されたブッシュ１３によって、ラック軸６が支持されている。また、ブッシュ１３は、一対の弾性部材１５によって径方向Ａ１に締め付けられ弾性的に縮径する。ブッシュ１３の縮径により、ブッシュ１３の本体１６の内周面１６ｂがラック軸６の外周面６ａに沿う。また、ラック軸６は、一対の弾性部材１５によって締め付けられたブッシュ１３によって径方向Ａ１に弾性的に支持される。   Thus, in the bearing device 11, the rack shaft 6 is supported by the bush 13 held in the holding hole 12 via the outer cylinder 14 and the pair of elastic members 15. The bush 13 is tightened in the radial direction A1 by a pair of elastic members 15 and elastically contracts in diameter. Due to the reduced diameter of the bush 13, the inner peripheral surface 16 b of the main body 16 of the bush 13 follows the outer peripheral surface 6 a of the rack shaft 6. The rack shaft 6 is elastically supported in the radial direction A1 by a bush 13 fastened by a pair of elastic members 15.

以上のように、この実施形態によれば、外筒１４を外筒１４の外周面１４ａとハウジング７の保持孔１２の内周面２４ｂとの摩擦係数がブッシュ１３の本体１６の内周面１６ｂとラック軸６の外周面６ａとの摩擦係数よりも大きくなる材料で形成している。これによって、ラック軸６が軸長方向Ｙ１に移動する場合に、外筒１４がラック軸６と共に軸長方向Ｙ１に移動することを規制できる。したがって、軸受装置１１がハウジング７から抜けることを防止できる。   As described above, according to this embodiment, the friction coefficient between the outer cylinder 14 and the outer peripheral surface 14 a of the outer cylinder 14 and the inner peripheral surface 24 b of the holding hole 12 of the housing 7 is the inner peripheral surface 16 b of the main body 16 of the bush 13. And the outer peripheral surface 6 a of the rack shaft 6. Thereby, when the rack shaft 6 moves in the axial direction Y1, it is possible to restrict the movement of the outer cylinder 14 together with the rack shaft 6 in the axial direction Y1. Therefore, it is possible to prevent the bearing device 11 from coming off the housing 7.

また、上記の摩擦係数を有する外筒１４を用いて、ラック軸６の軸長方向Ｙ１へのブッシュ１３の移動を規制しているので、外筒１４およびブッシュ１３に対する弾性部材１５の径方向Ａ１の締め代を適宜調整することができる。これにより、弾性部材１５の締め代を適切に調節して、ラック軸６の支持剛性および軸長方向Ｙ１の良好な摺動特性を得ることができる。   Further, since the movement of the bush 13 in the axial length direction Y1 of the rack shaft 6 is restricted by using the outer cylinder 14 having the friction coefficient, the radial direction A1 of the elastic member 15 with respect to the outer cylinder 14 and the bush 13 is used. The tightening margin can be adjusted as appropriate. Thereby, the fastening margin of the elastic member 15 can be adjusted appropriately, and the support rigidity of the rack shaft 6 and the favorable sliding characteristic of the axial length direction Y1 can be obtained.

この発明は、以上の実施形態の内容に限定されるものではなく、請求項記載の範囲内において種々の変更が可能である。例えば、外筒１４は、合成樹脂製であってもよい。外筒１４の外周面１４ａに凹凸を形成して摩擦係数を調整し、外筒１４の外周面１４ａとハウジング７の保持孔１２の内周面２４ｂとの摩擦係数がブッシュ１３の本体１６の内周面１６ｂとラック軸６の外周面６ａとの摩擦係数より大きくなるようにしてもよい。   The present invention is not limited to the contents of the above embodiments, and various modifications can be made within the scope of the claims. For example, the outer cylinder 14 may be made of a synthetic resin. The friction coefficient is adjusted by forming irregularities on the outer peripheral surface 14 a of the outer cylinder 14, and the friction coefficient between the outer peripheral surface 14 a of the outer cylinder 14 and the inner peripheral surface 24 b of the holding hole 12 of the housing 7 is the inner diameter of the body 16 of the bush 13. You may make it become larger than the friction coefficient of the surrounding surface 16b and the outer peripheral surface 6a of the rack shaft 6. FIG.

また、外筒１４の外径を自由状態において保持孔１２の小径部２４の内径よりも大きくし、小径部２４に外筒１４を圧入してもよい。さらに、外筒１４に、当該外筒１４の一端から他端に延び、外筒１４の周方向と交差するスリットを形成してもよい。これにより、保持孔１２の小径部２４に挿通された外筒１４を一対の弾性部材１５によって拡径させて、外筒１４の外周面１４ａを小径部２４の内周面２４ｂに押圧することができる。   Alternatively, the outer diameter of the outer cylinder 14 may be made larger than the inner diameter of the small diameter part 24 of the holding hole 12 in a free state, and the outer cylinder 14 may be press-fitted into the small diameter part 24. Furthermore, a slit that extends from one end of the outer cylinder 14 to the other end and intersects the circumferential direction of the outer cylinder 14 may be formed in the outer cylinder 14. Thereby, the outer cylinder 14 inserted into the small diameter portion 24 of the holding hole 12 is expanded by the pair of elastic members 15, and the outer peripheral surface 14 a of the outer cylinder 14 is pressed against the inner peripheral surface 24 b of the small diameter portion 24. it can.

本発明の一実施形態にかかるラックピニオン式ステアリング装置を模式的に示した概略図である。1 is a schematic view schematically showing a rack and pinion steering device according to an embodiment of the present invention. 図１における軸受装置およびその周辺を概略的に示す一部断面拡大図である。FIG. 2 is an enlarged partial cross-sectional view schematically showing the bearing device in FIG. 1 and its periphery. 自由状態における軸受装置のブッシュを概略的に示す断面図である。It is sectional drawing which shows schematically the bush of the bearing apparatus in a free state.

符号の説明Explanation of symbols

１・・・ラックピニオン式ステアリング装置（ステアリング装置）、６・・・ラック軸（軸部材、転舵軸）、７・・・ハウジング、１１・・・軸受装置、１２・・・保持孔、１３・・・ブッシュ（内筒）、１６ａ・・・外周面（内筒の外周面）、１４・・・外筒、１４ａ・・・外周面（外筒の外周面）、１４ｂ・・・内周面（外筒の内周面）、１５・・・弾性部材、１８ａ，１８ｂ，２３ａ，２３ｂ・・・環状溝、２０・・・スリット、２４ｂ・・・内周面（保持孔の内周面）ｗ・・・隙間、Ａ１・・・径方向、Ｘ１・・・左右方向、Ｙ１・・・軸長方向、Ｚ１・・・周方向   DESCRIPTION OF SYMBOLS 1 ... Rack and pinion type steering device (steering device), 6 ... Rack shaft (shaft member, steered shaft), 7 ... Housing, 11 ... Bearing device, 12 ... Holding hole, 13 ... Bush (inner cylinder), 16a ... Outer circumferential surface (outer circumferential surface of inner cylinder), 14 ... Outer cylinder, 14a ... Outer circumferential surface (outer circumferential surface of outer cylinder), 14b ... Inner circumference Surface (inner peripheral surface of outer cylinder), 15 ... elastic member, 18a, 18b, 23a, 23b ... annular groove, 20 ... slit, 24b ... inner peripheral surface (inner peripheral surface of holding hole) ) W ... gap, A1 ... radial direction, X1 ... left and right direction, Y1 ... axial length direction, Z1 ... circumferential direction

Claims (2)

軸部材を摺動自在に支持する内筒と、
内筒を、径方向に所定の隙間を設けて取り囲む外筒と、
内筒と外筒との間に、径方向に弾性的に圧縮された状態で介在する環状の弾性部材とを備え、
内筒は、周方向と交差する方向に延びるスリットを有していて弾性的に縮径可能であり、
内筒の外周面および外筒の内周面に、互いに対向して上記弾性部材を収容した環状溝がそれぞれ形成されており、
外筒の外周面が、ハウジングの保持孔の内周面に嵌め合わされて保持されており、
外筒の外周面とハウジングの保持孔の内周面との摩擦係数は、内筒の内周面と軸部材の外周面との摩擦係数よりも大きいことを特徴とする軸受装置。 An inner cylinder that slidably supports the shaft member;
An outer cylinder surrounding the inner cylinder with a predetermined gap in the radial direction;
An annular elastic member interposed between the inner cylinder and the outer cylinder in an elastically compressed state in the radial direction,
The inner cylinder has a slit extending in a direction intersecting the circumferential direction and can be elastically reduced in diameter,
On the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, annular grooves that accommodate the elastic members are formed opposite to each other,
The outer peripheral surface of the outer cylinder is fitted and held in the inner peripheral surface of the holding hole of the housing,
A bearing device, wherein a friction coefficient between an outer peripheral surface of the outer cylinder and an inner peripheral surface of the holding hole of the housing is larger than a friction coefficient between the inner peripheral surface of the inner cylinder and the outer peripheral surface of the shaft member. 車両の左右方向に延びる、軸部材としての転舵軸と、転舵軸を軸長方向に摺動自在に支持する請求項１記載の軸受装置と、軸受装置を保持する保持孔を有するハウジングとを備えるステアリング装置。

A steered shaft as a shaft member extending in the left-right direction of the vehicle, a bearing device according to claim 1 that slidably supports the steered shaft in an axial length direction, and a housing having a holding hole for holding the bearing device; A steering apparatus comprising:

JP2005272893A 2005-09-20 2005-09-20 BEARING DEVICE AND STEERING DEVICE PROVIDED WITH BEARING DEVICE Expired - Fee Related JP4970763B2 (en)

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JP5427647B2 (en) * 2010-03-01 2014-02-26 Ｃｋｄ株式会社 Electric actuator
DE102010042118A1 (en) * 2010-10-07 2012-04-12 Robert Bosch Gmbh Slide bearing, method for producing a plain bearing and use of a sliding bearing
JP2012144132A (en) * 2011-01-11 2012-08-02 Jtekt Corp Device for supporting rack shaft and steering device for vehicle
KR20210032638A (en) * 2019-09-17 2021-03-25 주식회사 만도 Steer-by-wire type steering apparatus

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JPS6115310Y2 (en) * 1981-03-30 1986-05-13
JPH0261773U (en) * 1988-10-31 1990-05-08
JP3696670B2 (en) * 1995-09-29 2005-09-21 カヤバ工業株式会社 guide bush

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