WO2016125547A1 - 滑り軸受 - Google Patents

滑り軸受 Download PDF

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Publication number
WO2016125547A1
WO2016125547A1 PCT/JP2016/050860 JP2016050860W WO2016125547A1 WO 2016125547 A1 WO2016125547 A1 WO 2016125547A1 JP 2016050860 W JP2016050860 W JP 2016050860W WO 2016125547 A1 WO2016125547 A1 WO 2016125547A1
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WO
WIPO (PCT)
Prior art keywords
bearing
bearing body
elastic ring
peripheral surface
elastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/050860
Other languages
English (en)
French (fr)
Inventor
昇 中川
和彦 明田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oiles Corp
Oiles Industry Co Ltd
Original Assignee
Oiles Corp
Oiles Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oiles Corp, Oiles Industry Co Ltd filed Critical Oiles Corp
Priority to KR1020177024525A priority Critical patent/KR102447103B1/ko
Priority to US15/548,192 priority patent/US9989084B2/en
Priority to BR112017013570-1A priority patent/BR112017013570B1/pt
Priority to EP16746378.5A priority patent/EP3255291B1/en
Priority to CN201680005532.1A priority patent/CN107110205B/zh
Priority to PL16746378T priority patent/PL3255291T4/pl
Publication of WO2016125547A1 publication Critical patent/WO2016125547A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00Sliding-contact bearings for exclusively rotary movement
    • F16C17/02Sliding-contact bearings for exclusively rotary movement for radial load only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D3/00Steering gears
    • B62D3/02Steering gears mechanical
    • B62D3/12Steering gears mechanical of rack-and-pinion type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/02Sliding-contact bearings
    • F16C25/04Sliding-contact bearings self-adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/02Sliding-contact bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • F16C27/063Sliding contact bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00Bearings for parts moving only linearly
    • F16C29/002Elastic or yielding linear bearings or bearing supports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00Bearings for parts moving only linearly
    • F16C29/02Sliding-contact bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/20Sliding surface consisting mainly of plastics
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/20Sliding surface consisting mainly of plastics
    • F16C33/201Composition of the plastic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/22Sliding surface consisting mainly of rubber or synthetic rubber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/01Parts of vehicles in general
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/20Land vehicles
    • F16C2326/24Steering systems, e.g. steering rods or columns
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/20Sliding surface consisting mainly of plastics
    • F16C33/208Methods of manufacture, e.g. shaping, applying coatings

Definitions

  • the present invention relates to a slide bearing that supports a load applied to a shaft member while allowing the shaft member to move, and more particularly to a slide bearing suitable for a rack bush used in a steering mechanism of a vehicle.
  • Patent Document 1 describes a sliding bearing suitable for a rack bush that supports a load applied to a rack shaft while allowing linear motion of the rack shaft of a vehicle steering mechanism.
  • This sliding bearing includes a cylindrical bearing body into which a rack shaft is inserted, and an elastic ring that is attached to the bearing body and biases the bearing body inward in the radial direction.
  • the bearing body is made of synthetic resin and has a plurality of first slits formed along the axial direction from one end surface toward the other end surface, and along the axial direction from the other end surface toward the one end surface.
  • a plurality of second slits formed on the outer peripheral surface of the bearing body, and a mounting groove on which the elastic ring is mounted.
  • the first slit is arranged in one semi-cylindrical portion of the bearing body divided by the virtual plane including the axis of the bearing body
  • the second slit is a bearing divided by the virtual plane. It is arranged on the other semi-cylindrical part of the main body.
  • the first slit and the second slit have the same width from the inner side to the outer side of the semi-cylindrical part in the direction perpendicular to the virtual plane, or the inner side, or the inner side. It is formed to gradually increase from the outside toward the outside.
  • the diameter of the bearing main body is reduced by the elastic ring, and the rack shaft inserted into the bearing main body is tightened. Therefore, the gap between the inner peripheral surface of the bearing main body and the outer peripheral surface of the rack shaft is reduced.
  • the clearance 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 it is possible to prevent the variation of the friction torque due to the outer diameter error of the rack shaft.
  • the first slit and the second slit have a slit width parallel to a virtual plane including the axis of the bearing body and a direction perpendicular to the virtual plane.
  • the width is the same from the inner side to the outer side of the semi-cylindrical part, or is gradually increased from the inner side to the outer side.
  • Bearing body using an outer mold (upper mold) and an outer mold (lower mold) for the other semi-cylindrical portion, and a core for forming a hollow portion (rack shaft insertion hole) of the bearing body Can be molded. Therefore, it is not necessary to divide the outer mold into the number corresponding to the number of the first slits and the second slits formed in the bearing body, so that the manufacturing cost can be reduced.
  • the sliding bearing described in Patent Document 1 requires a core in addition to the two outer molds (upper mold and lower mold) for molding the bearing body. Also, since the bearing body is molded so that the virtual plane including the shaft center of the bearing body is sandwiched between the two outer molds, the molded product of the bearing body is arranged in parallel to the molding surface of the outer mold, and the molding is performed once. The number of molded products that can be removed from the mold depends on the axial length of the bearing body, and decreases as the axial length increases.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a slide bearing that can be manufactured at a lower cost.
  • the first elastic body locking portion is formed on one end side of the outer peripheral surface
  • the second elastic body locking portion is formed on the other end side of the outer peripheral surface.
  • locking part is distribute
  • An elastic body that urges the bearing body radially inward is mounted between the first elastic body locking portion and the second elastic body locking portion of the bearing body.
  • the sliding bearing of the present invention is a sliding bearing that supports a load applied to the shaft member while allowing movement of the shaft member, A cylindrical bearing body into which the shaft member is inserted; An elastic body mounted on the bearing body and biasing the bearing body radially inward, The bearing body is A slit formed along the axial direction from one end face to the other end face; A first elastic body locking portion formed on one end side of the outer peripheral surface and projecting radially outward; A second elastic body locking portion formed on the other end side of the outer peripheral surface and projecting radially outward, The first elastic body locking portion and the second elastic body locking portion are arranged at positions that do not overlap each other in a virtual plane perpendicular to the axis of the bearing body.
  • a slit is formed in the bearing body along the axial direction from either one end surface to the other end surface, and the first and second elastic body members project radially outward from the outer peripheral surface.
  • a stop portion is formed, and the first and second elastic body locking portions are arranged at positions that do not overlap with each other in a virtual plane perpendicular to the axis of the bearing body.
  • a bearing body can be formed without a core using a mold (upper mold and lower mold). Further, since the molded product of the bearing main body is arranged perpendicular to the molding surface of the outer mold, the number of molded products that can be taken out from the mold by one molding does not depend on the axial length of the bearing main body. Therefore, according to the present invention, a slide bearing that can be manufactured at a lower cost can be provided.
  • 1A, 1B, and 1C are a front view, a side view, and a rear view of a plain bearing 1 according to an embodiment of the present invention.
  • 2A, 2B, and 2C are a front view, a side view, and a rear view of the bearing body 2
  • FIGS. 2D and 2E are FIGS. 2A and 2B are a cross-sectional view taken along line AA and BB of the bearing body 2 shown in FIG. 3A and 3B are a front view and a side view of the elastic ring
  • FIG. 3C is a cross-sectional view of the elastic ring 3 shown in FIG. 3A taken along the line CC. .
  • FIG. 1A, FIG. 1B, and FIG. 1C are a front view, a side view, and a rear view of a plain bearing 1 according to an embodiment of the present invention.
  • the sliding bearing 1 supports a load applied to the shaft member while allowing linear motion of a shaft member such as a rack shaft of a vehicle steering mechanism.
  • the sliding bearing 1 includes a cylindrical bearing body 2 into which a shaft member (not shown) is inserted, and an elastic ring 3 that is attached to the bearing body 2 and biases the bearing body 2 radially inward. And.
  • FIGS. 2A, 2B, and 2C are a front view, a side view, and a rear view of the bearing body 2
  • FIGS. 2D and 2E are FIGS. 2A and 2B are a cross-sectional view taken along line AA and BB of the bearing body 2 shown in FIG.
  • the bearing body 2 is formed on the inner peripheral surface 20, and is a sliding surface 21 that is in sliding contact with the outer peripheral surface of the inserted shaft member, and an axis O direction from one end surface 23 toward the other end surface 24.
  • a plurality of first elastic ring locking portions 27 that are formed on the portion 220 side and project outward in the radial direction, and a plurality of first elastic ring engagement portions 27 that are formed on the other end 221 side of the outer peripheral surface 22 and project outward in the radial direction.
  • a second elastic ring locking portion 28 is located at positions that do not overlap with each other in a virtual plane P perpendicular to the axis O of the bearing body 2, that is, FIG. 2 (A) and FIG. In the front view and the rear view shown in C), they are arranged at positions that do not overlap each other.
  • the bearing body 2 is integrally formed using a synthetic resin having good sliding characteristics, such as a thermoplastic synthetic resin such as polyacetal resin, polyimide resin, polyethylene resin, and tetrafluoroethylene resin.
  • a synthetic resin having good sliding characteristics such as a thermoplastic synthetic resin such as polyacetal resin, polyimide resin, polyethylene resin, and tetrafluoroethylene resin.
  • FIG. 3A and 3B are a front view and a side view of the elastic ring 3
  • FIG. 3C is a cross-sectional view of the elastic ring 3 shown in FIG. 3A taken along the line CC. .
  • the elastic ring 3 has a cylindrical shape, and its inner diameter ⁇ 2 is smaller than the outer diameter ⁇ 1 of the bearing body 1. Thereby, when the elastic ring 3 is mounted on the bearing body 2, the bearing body 2 is urged radially inward.
  • the elastic ring 3 is formed using a thermoplastic synthetic resin having elasticity such as natural rubber, synthetic rubber, or polyester elastomer.
  • the elastic ring 3 is cylindrical, but it may be a so-called O-ring.
  • an elastic ring may be used as long as it is an elastic body that is attached to the bearing body 2 and can bias the bearing body 2 radially inward.
  • a plurality of first slits 25 are formed in the bearing body 2 from one end surface 23 toward the other end surface 24 along the axis O direction, and from the other end surface 24. Since the plurality of second slits 26 are formed along the axis O direction toward the one end face 23, the bearing body 2 can be expanded and contracted in the radial direction. Then, the diameter of the bearing body 2 is reduced by the elastic ring 3 attached to the bearing body 2, and the shaft member inserted into the bearing body 2 is tightened, so that the sliding surface 21 formed on the inner peripheral surface 20 of the bearing body 2.
  • the clearance between the shaft member and the outer peripheral surface of the shaft member can be made zero to prevent generation of unpleasant noise due to a collision between the sliding surface 21 formed on the inner peripheral surface 20 of the bearing body 2 and the outer peripheral surface of the shaft member. In addition, it is possible to prevent fluctuations in the friction torque due to an outer diameter error of the shaft member.
  • a plurality of first elastic ring locking portions 27 projecting radially outward are formed on one end 220 side of the outer peripheral surface 22 of the bearing body 2, and Since the plurality of second elastic ring locking portions 28 projecting radially outward are formed on the other end 221 side of the outer peripheral surface 22, the first elastic ring locking portion 27 and the second elastic ring locking portion 27 of the bearing body 2 are formed. It is possible to prevent the elastic ring 3 mounted between the elastic ring locking portion 28 from falling off the bearing body 2.
  • the first elastic ring locking portion 27 and the second elastic ring locking portion 28 formed on the outer peripheral surface 22 of the bearing body 1 are used as the shaft O of the bearing body 2. Since they are arranged at positions that do not overlap each other in the vertical virtual plane P, that is, positions that do not overlap each other in the front view and the rear view shown in FIGS.
  • the bearing body 2 can be integrally formed without a core using two outer molds (upper mold and lower mold) that move relative to each other. In this case, since the molded product of the bearing body 2 can be arranged perpendicular to the molding surface of the outer mold, the number of molded products that can be removed from the mold by one molding is the length of the bearing body 2 in the axis O direction. Do not depend. Therefore, the slide bearing 2 that can be manufactured at a lower cost can be provided.
  • a plurality of first slits 25 are formed in the bearing body 2 from the one end surface 23 toward the other end surface 24 along the axis O direction, and The plurality of second slits 26 are formed along the axis O direction toward the end face 23, but the present invention is not limited to this.
  • the bearing body 2 only needs to have a slit formed along the axis O direction from one of the end faces toward the other end face.
  • the shape of the bearing main body 2 is made into the cylindrical shape, what is necessary is just a cylindrical shape suitable for the shape of the shaft member inserted.
  • the present invention is widely applicable to a sliding bearing that supports a load applied to the shaft member while allowing the shaft member to move.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Sliding-Contact Bearings (AREA)
  • Support Of The Bearing (AREA)
  • Bearings For Parts Moving Linearly (AREA)

Abstract

 低コストで製造可能な滑り軸受を提供する。滑り軸受(1)は、軸部材が挿入される円筒状の軸受本体(2)と、軸受本体(2)に装着され、軸受本体(2)を径方向内方に付勢する弾性リング(3)を備える。軸受本体(2)は、挿入された軸部材の外周面と摺接する摺動面(21)と、一方の端面(23)から他方の端面(24)に向けて軸O方向に沿った複数の第一スリット(25)と、他方の端面(24)から一方の端面(23)に向けて軸O方向に沿った複数の第二スリット(26)と、外周面(22)の一方の端部(220)側において径方向外方に突出する複数の第一弾性リング係止部(27)と、外周面(22)の他方の端部(221)側において径方向外方に突出する複数の第二弾性リング係止部(28)を有する。第一弾性リング係止部(27)および第二弾性リング係止部(28)は、軸Oに垂直な仮想平面Pにおいて互いに重ならない位置に配される。

Description

滑り軸受
 本発明は、軸部材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。
 特許文献1には、車両のステアリング機構のラック軸の直線運動を許容しつつ、ラック軸に加わる荷重を支持するラックブッシュに好適な滑り軸受が記載されている。
 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、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複数の第一のスリットと、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複数の第二のスリットと、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、を有する。
 ここで、第一のスリットは、軸受本体の軸心を含む仮想平面によって分断される軸受本体の一方の半円筒部に配されており、第二のスリットは、この仮想平面によって分断される軸受本体の他方の半円筒部に配されている。また、第一のスリットおよび第二のスリットは、それぞれ、この仮想平面と平行なスリット幅が、この仮想平面に対して垂直な方向において、半円筒部の内側から外側まで同幅か、あるいは内側から外側に向かうにつれて徐々に大きくなるように形成されている。
 特許文献1に記載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できる。
 また、特許文献1に記載の滑り軸受は、第一のスリットおよび第二のスリットを、それぞれ、軸受本体の軸心を含む仮想平面と平行なスリット幅が、この仮想平面に対して垂直な方向において、この半円筒部の内側から外側まで同幅か、あるいは内側から外側に向かうにつれて徐々に大きくなるように形成しているので、この仮想平面によって分断される軸受本体の一方の半円筒部用の外型(上型)および他方の半円筒部用の外型(下型)と、軸受本体の中空部分(ラック軸の挿入孔)を形成するための中子と、を用いて、軸受本体を成形することができる。したがって、軸受本体に形成される第一のスリットおよび第二のスリットの数に応じた数に外型を分割する必要がないため、製造コストを低減することができる。
特許第4940931号
 しかしながら、特許文献1に記載の滑り軸受では、軸受本体の成形に、2つの外型(上型および下型)に加えて中子が必要である。また、軸受本体の軸心を含む仮想平面を2つの外型で挟み込むようにして軸受本体を成形するため、軸受本体の成形品が外型の成形面に対して平行に配置され、一度の成形で金型から取り出せる成形品の数が軸受本体の軸方向の長さに依存し、軸方向の長さが長くなるほど少なくなる。
 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、より低コストで製造可能な滑り軸受を提供することにある。
 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筒状の軸受本体に、いずれか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と、外周面から径方向外方に突出する第一および第二の弾性体係止部と、を設ける。ここで、第一の弾性体係止部は、外周面の一方の端部側に形成され、第二の弾性体係止部は、外周面の他方の端部側に形成される。そして、第一および第二の弾性体係止部は、軸心に垂直な仮想平面において互いに重ならない位置に配される。また、軸受本体の第一の弾性体係止部と第二の弾性体係止部との間には、軸受本体を径方向内方に付勢する弾性体が装着される。
 例えば、本発明の滑り軸受は、軸部材の移動を許容しつつ、前記軸部材に加わる荷重を支持する滑り軸受であって、
 前記軸部材が挿入される筒状の軸受本体と、
 前記軸受本体に装着され、前記軸受本体を径方向内方に付勢する弾性体と、を備え、
 前記軸受本体は、
 いずれか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と、
 外周面の一方の端部側に形成され、径方向外方に突出する第一の弾性体係止部と、
 外周面の他方の端部側に形成され、径方向外方に突出する第二の弾性体係止部と、を有し、
 前記第一の弾性体係止部および前記第二の弾性体係止部は、前記軸受本体の軸心に垂直な仮想平面において互いに重ならない位置に配される。
 本発明では、軸受本体に、いずれか一方の端面から他方の端面に向けて軸方向に沿ってスリットを形成するとともに、外周面から径方向外方に突出する第一および第二の弾性体係止部を形成し、第一および第二の弾性体係止部を、軸受本体の軸心に垂直な仮想平面において互いに重ならない位置に配しているので、軸方向に相対移動する2つの外型(上型および下型)を用いて、中子なしで軸受本体を成形することができる。また、軸受本体の成形品が外型の成形面に対して垂直に配置されるので、一度の成形で金型から取り出せる成形品の数が軸受本体の軸方向の長さに依存しない。したがって、本発明によれば、より低コストで製造可能な滑り軸受を提供することができる。
図1(A)、図1(B)および図1(C)は、本発明の一実施の形態に係る滑り軸受1の正面図、側面図および背面図である。 図2(A)、図2(B)および図2(C)は、軸受本体2の正面図、側面図および背面図であり、図2(D)および図2(E)は、図2(A)に示す軸受本体2のA-A断面図およびB-B断面図である。 図3(A)および図3(B)は、弾性リング3の正面図および側面図であり、図3(C)は、図3(A)に示す弾性リング3のC-C断面図である。
 以下、本発明の一実施の形態について説明する。
 図1(A)、図1(B)および図1(C)は、本発明の一実施の形態に係る滑り軸受1の正面図、側面図および背面図である。
 本実施の形態に係る滑り軸受1は、車両のステアリング機構のラック軸等の軸部材の直線運動を許容しつつ、この軸部材に加わる荷重を支持する。図示するように、滑り軸受1は、軸部材(不図示)が挿入される円筒状の軸受本体2と、軸受本体2に装着され、軸受本体2を径方向内方に付勢する弾性リング3と、を備えている。
 図2(A)、図2(B)および図2(C)は、軸受本体2の正面図、側面図および背面図であり、図2(D)および図2(E)は、図2(A)に示す軸受本体2のA-A断面図およびB-B断面図である。
 図示するように、軸受本体2は、内周面20に形成され、挿入された軸部材の外周面と摺接する摺動面21と、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た複数の第一スリット25と、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た複数の第二スリット26と、外周面22の一方の端部220側に形成され、径方向外方に突出する複数の第一弾性リング係止部27と、外周面22の他方の端部221側に形成され、径方向外方に突出する複数の第二弾性リング係止部28と、を有する。ここで、第一弾性リング係止部27および第二弾性リング係止部28は、軸受本体2の軸Oに垂直な仮想平面Pにおいて互いに重ならない位置、つまり図2(A)および図2(C)に示す正面図および背面図において互いに重ならない位置に配されている。
 軸受本体2は、ポリアセタール樹脂、ポリイミド樹脂、ポリエチレン樹脂、四フッ化エチレン樹脂等の熱可塑性合成樹脂等の、摺動特性のよい合成樹脂を用いて一体成形される。
 図3(A)および図3(B)は、弾性リング3の正面図および側面図であり、図3(C)は、図3(A)に示す弾性リング3のC-C断面図である。
 図示するように、弾性リング3は、円筒状をしており、その内径φ2は、軸受本体1の外径φ1より小さい。これにより、弾性リング3は、軸受本体2に装着された場合に、軸受本体2を径方向内方に付勢する。弾性リング3は、天然ゴム、合成ゴム、あるいは、ポリエステルエラストマー等の弾性を有する熱可塑性合成樹脂を用いて形成される。なお、ここでは、弾性リング3を円筒状としているが、いわゆるOリングであってもよい。また、軸受本体2に装着され、軸受本体2を径方向内方に付勢することができる弾性体であれば、弾性リングでなくてもかまわない。
 以上、本発明の一実施の形態について説明した。
 本実施の形態に係る滑り軸受1では、軸受本体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ので、軸受本体2を径方向に伸縮することができる。そして、軸受本体2に装着された弾性リング3によって軸受本体2が縮径し、軸受本体2に挿入された軸部材を締め付けるので、軸受本体2の内周面20に形成された摺動面21と軸部材の外周面との間のクリアランスをゼロにして、軸受本体2の内周面20に形成された摺動面21と軸部材の外周面と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、軸部材の外径寸法誤差による摩擦トルクの変動を防止できる。
 また、本実施の形態に係る滑り軸受1では、軸受本体2の外周面22の一方の端部220側に径方向外方に突出する複数の第一弾性リング係止部27を形成するとともに、外周面22の他方の端部221側に径方向外方に突出する複数の第二弾性リング係止部28を形成しているので、軸受本体2の第一弾性リング係止部27と第二弾性リング係止部28との間に装着された弾性リング3が、軸受本体2から抜け落ちるのを防止することができる。
 また、本実施の形態に係る滑り軸受1では、軸受本体1の外周面22に形成された第一弾性リング係止部27および第二弾性リング係止部28を、軸受本体2の軸Oに垂直な仮想平面Pにおいて互いに重ならない位置、つまり図2(A)および図2(C)に示す正面図および背面図において互いに重ならない位置に配しているので、軸受本体2の軸O方向に相対移動する2つの外型(上型および下型)を用いて、中子なしで軸受本体2を一体成形することができる。また、この場合、軸受本体2の成形品を外型の成形面に対して垂直に配置できるので、一度の成形で金型から取り出せる成形品の数が軸受本体2の軸O方向の長さに依存しない。したがって、より低コストで製造可能な滑り軸受2を提供することができる。
 なお、本発明は、上記の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。
 例えば、上記の実施の形態では、軸受本体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が、本発明はこれに限定されない。軸受本体2は、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ものであればよい。また、本実施の形態では、軸受本体2の形状を円筒状としているが、挿入される軸部材の形状に適合する筒形状であればよい。
 また、本発明は、軸部材の移動を許容しつつ、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。
 1:滑り軸受、 2:軸受本体、 3:弾性リング、 20:軸受本体2の内周面、 21:軸受本体2の摺動面、 22:軸受本体2の外周面、 23、24:軸受本体2の端部、 25:第一スリット、 26:第二スリット、 27:第一弾性リング係止部、 28:第二弾性リング係止部、 220、221の外周面22の端部

Claims (3)

  1.  軸部材の移動を許容しつつ、前記軸部材に加わる荷重を支持する滑り軸受であって、
     前記軸部材が挿入される筒状の軸受本体と、
     前記軸受本体に装着され、前記軸受本体を径方向内方に付勢する弾性体と、を備え、
     前記軸受本体は、
     いずれか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と、
     外周面の一方の端部側に形成され、径方向外方に突出する第一の弾性体係止部と、
     外周面の他方の端部側に形成され、径方向外方に突出する第二の弾性体係止部と、を有し、
     前記第一の弾性体係止部および前記第二の弾性体係止部は、前記軸受本体の軸心に垂直な仮想平面において互いに重ならない位置に配される
     ことを特徴とする滑り軸受。
  2.  請求項1に記載の滑り軸受であって、
     前記軸受本体は、合成樹脂で形成されている
     ことを特徴とする滑り軸受。
  3.  請求項1または2に記載の滑り軸受であって、
     前記弾性体は、ゴム、あるいは弾性を有する合成樹脂で形成されている
     ことを特徴とする滑り軸受。
PCT/JP2016/050860 2015-02-03 2016-01-13 滑り軸受 Ceased WO2016125547A1 (ja)

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