JP2016169816A - Bearing bush and coupling mechanism equipped with bearing bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing bush capable of preventing the generation of noise, and a coupling mechanism equipped with the bearing bush.SOLUTION: A bearing bush 1 is equipped with a cylindrical portion 5 which has a slit 4 extending from one end portion 2 to the other end portion 3 in an axial direction A so as to freely contract, and an annular collar portion 6 which is integrally provided at the one end portion 2 of the cylindrical portion 5. The collar portion 6 is equipped with a curved base portion 31 extending from the end portion 2 outward in a diametrical direction B of the cylindrical portion 5, and a tip end portion 32 inclining and extending from the curved base portion 31 toward the end portion 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bearing bush and a coupling mechanism that includes the bearing bush and couples a plurality of coupling members used in a vehicle seat storage mechanism to each other in a freely rotatable manner.

  As described in Patent Documents 1 to 4, in a vehicle such as an automobile, a rear seat including a seat cushion (seat) and a seat back (backrest) connected to the seat cushion (seat) is used. When not, a vehicle seat storage mechanism is used which is stored in a storage portion formed on the vehicle body floor.

  Such a vehicle seat storage mechanism is provided with a connecting portion that rotatably connects a plurality of connecting members to each other. In this connecting portion, the plurality of connecting members have a bearing bush on the shaft member at one end thereof. It is rotatably supported via.

JP 2014-208505 A JP 2014-208506 A JP 2014-141240 A JP 2014-141241 A

  By the way, a flange portion of the bearing bush is disposed between one end portions of the plurality of connecting members. To eliminate axial backlash, the end portion and the flange portion are connected to each other by a fastening means provided on the shaft member. When the parts are brought into strong pressure contact in the axial direction without a gap, smooth rotation of the plurality of connecting members cannot be secured, while there is a slight gap in the axial direction between the one end and the flange part. If one end of each is rotatably supported by the shaft member via the bearing bush, there is no problem in normal traveling of the vehicle, but if severe rolling such as rough road traveling occurs in the vehicle body, one end of the connecting member The part moves violently in the axial direction with respect to the shaft member, and this movement may cause abnormal noise due to collision or slipping, which may cause anxiety to the occupant.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a bearing bush capable of preventing the generation of abnormal noise and a coupling mechanism including the bearing bush.

  The bearing bush of the present invention comprises a cylindrical part having a slit extending from one end part to the other end part, and a flange part provided at one end part of the cylindrical part, The flange includes a curved base extending from one end of the cylindrical portion outward in the radial direction of the cylindrical portion, and a distal end extending from the curved base toward the other end of the cylindrical portion. ing.

  According to the bearing bush of the present invention, the flange portion extends from one end portion of the cylindrical portion to the radially outer side of the cylindrical portion, and from the curved base portion to the other end portion of the cylindrical portion. When the flange portion is disposed between the axial directions of the respective one end portions of the connecting member, the one end portion of the connecting member moves violently in the axial direction with respect to the shaft member. Even so, the buttocks can be elastically deformed to buffer this intense movement and avoid collisions or slips, thus eliminating the generation of abnormal noise caused by the collisions or slips and causing anxiety to the passengers. I will not let you.

  In the bearing bush of the present invention, the curved base may include a curved convex surface continuously extending from the cylindrical inner surface of the cylindrical portion, and another curved convex surface continuously extending from the curved convex surface, In this case, the curved convex surface and the other curved convex surface may have the same curvature.

  Thus, when the curved base has a curved convex surface and another curved convex surface continuously extending from the curved convex surface, the pressing contact to the one end of the connecting member can be substantially linear contact. The frictional resistance between the one end portion and the curved base portion can be reduced, and the connecting member can be smoothly rotated.

  On the other hand, in the bearing bush of the present invention, the curved base may include a curved convex surface continuously extending from the cylindrical inner surface of the cylindrical portion, and a flat surface continuously extending from the curved convex surface, As described above, when the curved base portion has a flat surface continuously extending from the curved convex surface, the pressing contact to the one end portion of the coupling member can be substantially surface contact. Reduction can be reduced and durability can be improved.

  In the present invention, in a preferred example, the curved base portion has a curved concave surface continuously extending from the cylindrical outer surface of the cylindrical portion, and the curved base portion having such a curved concave surface is the elasticity of the collar portion. Deformation can be preferably obtained.

  In the present invention, in a preferred example, the distal end portion is inclined and extended from the curved base portion toward the other end portion of the cylindrical portion. In this case, the distal end portion is on one end portion side of the cylindrical portion. Even if it has a flat surface inclined from the curved base toward the other end of the cylindrical portion, it faces the other end of the cylindrical portion from the curved base toward the other end of the cylindrical portion. And may have an inclined flat surface.

  In the present invention, instead of the inclined tip portion, the tip portion may be curved and extended from the curved base portion toward the other end portion of the cylindrical portion. In this case, the tip portion is cylindrical. Even if it has a curved convex surface on one end side of the part, it may have a curved concave surface on the other end side of the cylindrical part.

  In the bearing bush of the present invention, preferably, the cylindrical portion and the flange portion are integrally formed from a synthetic resin such as polyacetal resin or polyamide resin, a non-ferrous metal plate such as copper or copper alloy, aluminum or aluminum alloy, or a stainless steel plate. More preferably, the cylindrical portion and the flange portion include a steel thin plate, a porous metal sintered layer integrally formed on the steel thin plate, and a synthetic resin layer filled and coated with the porous metal sintered layer. In this case, the cylindrical inner surface of the cylindrical portion and the annular surface of the flange extending continuously from the cylindrical inner surface are made of the surface of the synthetic resin layer. If the cylindrical inner surface of the cylindrical portion and the annular surface of the flange portion are formed from the surface of the synthetic resin layer, the rotation at one end of the connecting member can be performed smoothly.

  One connecting member is fixed and the other one connecting member is mounted so as to be movable in the axial direction, and the bearing bush is provided. In the coupling mechanism of the present invention in which one coupling member and the other coupling member are coupled to each other so that the one coupling member is relatively rotatable around the axis, the cylindrical portion of the bearing bush is In order to ensure relative rotation around the shaft member of the other connecting member with respect to the shaft member, the shaft member is interposed between the other connecting member and attached to the shaft member. The flange portion of the bearing bush is disposed in a gap between the one connecting member and the other one connecting member in the axial direction, and the other one connecting member is connected to the one through the flange portion in the axial direction. It can be pressed against the connecting member.

  According to the connection mechanism of the present invention, the flange portion of the bearing bush is disposed in the gap between the one connection member and the other connection member, and the other one connection member is the flange in the axial direction. Since the first connecting member is pressed against the one connecting member through the portion, the relative axial movement of the other connecting member with respect to the one connecting member is buffered by the elastic deformation of the collar portion. As a result, it is possible to avoid a sudden collision between one connecting member and the other one connecting member or a sudden axial slip of the other connecting member with respect to the shaft member. The generation of sound can be eliminated, and the passengers will not feel uneasy.

  ADVANTAGE OF THE INVENTION According to this invention, the bearing bush which can prevent generation | occurrence | production of unusual noise, and the connection mechanism provided with this bearing bush can be provided.

FIG. 1 is a cross-sectional explanatory view taken along the line I-I in FIG. 2 of an example of a preferred embodiment of a bearing bush of the present invention. FIG. 2 is an explanatory diagram on the right side of the example shown in FIG. FIG. 3 is a cross-sectional explanatory view of a multilayer board which is a forming material of the example shown in FIG. FIG. 4 is an explanatory front sectional view of an example in which the example shown in FIG. FIG. 5 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. FIG. 6 is an explanatory view of another example of the preferred embodiment of the bearing bush of the present invention.

  Next, the present invention and its embodiments will be described in more detail based on preferred specific examples shown in the drawings. The present invention is not limited to these specific examples.

  1 to 3, the bearing bush 1 of this example has a cylindrical portion 5 having a slit 4 extending from one end portion 2 in the axial direction A to the other end portion 3 so that the diameter can be freely reduced. And an annular flange 6 integrally provided at one end 2 of the cylindrical portion 5.

  The bearing bush 1 as a flanged bush having the cylindrical portion 5 and the flange portion 6 includes a steel sheet 15 having copper coating layers 13 and 14 on both surfaces 11 and 12, and one surface 11 of the steel sheet 15. One surface of the porous metal sintered layer 16 is filled with the porous metal sintered layer 16 integrally formed through the copper coating layer 13 and the pores of the porous metal sintered layer 16. The multi-layer plate 19 having a synthetic resin layer 18 containing ethylene tetrafluoride resin coated thereon is integrally formed by press molding.

  The cylindrical portion 5 has a cylindrical inner surface 21 formed from the surface of the synthetic resin layer 18, a cylindrical outer surface 22 formed from the surface of the copper coating layer 14, and a taper in the axial direction A in which the slit 4 is opened at the end 3. And an annular end face 23.

  The flange portion 6 includes a curved base portion 31 extending outward from the end portion 2 in the radial direction B of the cylindrical portion 5, and a distal end portion (free end portion) 32 extending obliquely from the curved base portion 31 toward the end portion 3. It has.

  The curved base 31 includes an annular curved convex surface 35 continuously extending from the cylindrical inner surface 21 outward in the radial direction B, and an outer side in the radial direction B continuously from the curved convex surface 35 in the axial direction A. An annular flat surface 36 extending substantially orthogonally to the cylindrical outer surface 22 and an annular curved concave surface 37 continuously extending outward in the radial direction B from the cylindrical outer surface 22 are provided.

  The distal end portion 32 includes an annular flat surface 41 extending continuously from the curved base portion 31 toward the end portion 3 toward the end portion 2 side, that is, toward the flat surface 36 side, and an end portion. On the third side, that is, on the curved concave surface 37 side, an annular flat surface 42 that extends continuously from the curved concave surface 37 and is inclined from the curved base portion 31 toward the end portion 3 is provided.

  For example, as shown in FIGS. 4 and 5, the bearing bush 1 described above is used in a coupling mechanism 53 that couples coupling members 51 and 52 used in a vehicle seat storage mechanism so as to be rotatable relative to each other.

  The connection mechanism 53 that connects the connection members 51 and 52 to each other so that the connection member 51 is rotatable in the direction R relative to the connection member 52 around the axis O of the cylindrical portion 5 is the connection member 51. A shaft member 64 which is mounted so as to be movable in the axial direction A at the bifurcated end 61 and to be rotatable in the direction R around the axis O, and to which the connecting member 52 is fixed at the bifurcated end 62; Bearing bushes 1 a and 1 b made of the bush 1 are provided.

  The connecting member 51 is rotatably connected to the seat cushion (seat) of a rear seat of a vehicle such as an automobile at the other end, and the connecting member 52 is rotatably connected to the vehicle body floor at the other end. A rear seat composed of a seat cushion (seat) and a seat back (backrest) connected to the seat cushion (seat) by folding around the shaft member 64 of the connecting member 52 with respect to the member 51 is formed on the vehicle body floor. It is designed to be stored in the storage section.

  The shaft member 64 is integrally formed with a column main body 66 having a cylindrical outer peripheral surface 65, a massive head 67 formed integrally with one end of the column main body 66 in the axial direction A, and the other end of the column main body 66 in the axial direction A. A stepped bolt 69 having a threaded portion 68 and a tightening nut 70 screwed to the threaded portion 68.

  The shaft member 64 has a threaded portion of the tightening nut 70 so that the connecting member 51 can rotate with an appropriate resistance in the direction R relative to the connecting member 52 around the axis O which is also the axis of the cylindrical body 66. Each of the one ends 62 is fastened to the one end 61 in the axial direction A via the respective flanges 6 of the bearing bushes 1a and 1b.

  The cylindrical portion 5 of the bearing bush 1a is inserted into the through hole 75 of one end 61, and has one end 61 that defines the through hole 75 with the cylindrical inner surface 21 and the cylindrical outer surface 22 with the cylindrical inner surface 21. The cylindrical portion 5 of the bearing bush 1a is slidably in contact with the cylindrical inner peripheral surface 76, and the relative direction of the connecting member 51 around the axis O with respect to the column main body 66 is thus determined. In order to ensure the rotation of R, the cylindrical body 66 is mounted on the cylindrical body 66 so as to be interposed between the cylindrical body 66 and the cylindrical inner peripheral surface 76 of one end 61.

  The flange portion 6 of the bearing bush 1a is pressed against the side surface 81 of one end 62 at least by the flat surface 36 and against the side surface 83 of one end 61 by the annular outer peripheral edge 82 of the flat surface 42 of the tip end portion 32. The axial direction A tightening caused by the screwing of the tightening nut 70 to the threaded portion 68 is brought into contact with the gap 84 between the side surface 83 of the one end 61 and the side surface 81 of the one end 62 in the axial direction A. It is elastically deformed by force.

  The cylindrical portion 5 and the flange portion 6 of the bearing bush 1b are disposed between the other ends 61 and 62 and the column body 66 in the same manner as the cylindrical portion 5 and the flange portion 6 of the bearing bush 1a.

  According to the coupling mechanism 53 described above, each of the one ends 62 of the coupling member 52 is pressed against each of the one ends 61 of the coupling member 51 via the flange portion 6 in the axial direction A. The intense relative movement of the connecting member 51 in the axial direction A with respect to 52 is buffered by the elastic deformation of the flange 6, resulting in a sudden collision between one end 61 of the connecting member 51 and one end 62 of the connecting member 52, or a cylinder body. A sudden slip in the axial direction A of the connecting member 51 with respect to 66 can be avoided, and thus the generation of abnormal noise due to a collision or slippage can be eliminated, so that the passenger does not feel uneasy.

  In the coupling mechanism 53 shown in FIG. 4, the bearing bush 1 is used for each of the two bearing bushes 1a and 1b. Instead, the bearing bush 1 is used as one of the bearing bushes 1a and 1b. A bushed bush that does not elastically deform may be used for the other of 1a and 1b.

  By the way, in the flange portion 6 of the bearing bush 1, the curved base portion 31 has a flat surface 36, and the distal end portion 32 has flat surfaces 41 and 42, respectively, from the curved base portion 31 to the end portion 3. However, instead of this, as shown in FIG. 6, the curved base 31 includes a curved convex surface 35 continuously extending from the cylindrical inner surface 21, and a curved convex surface 35 continuously. The curved convex surface 35 may have another curved convex surface 101 that has the same curvature as that of the curved convex surface 35, and the distal end portion 32 is curved and extended from the curved base portion 31 toward the end portion 3. One end 2 side of the cylindrical portion 5, that is, the curved convex surface 101 side, has a curved convex surface 102 extending continuously from the curved convex surface 101, while the end 3 side, that is, the curved concave surface 37 side. The curved concave surface 37 extends continuously with the curved concave surface 37. The same curvature may have other concave curved surface 103 having.

  Also by the bearing bush 1 shown in FIG. 6, as a result of the elastic deformation of the flange portion 6 by the pressing and clamping force in the axial direction A to the flange portion 6, for example, the end 62 of the connecting member 52 with respect to the cylindrical body 66 Vigorous movement in the axial direction A can be buffered, and collision or slipping can be avoided, so that the generation of abnormal noise due to the collision or slipping can be eliminated and the passenger can be prevented from feeling uneasy.

DESCRIPTION OF SYMBOLS 1 Bearing bush 2, 3 End part 4 Slit 5 Cylindrical part 6 collar part 31 Curved base part 32 Tip part

Claims (15)

  A cylindrical portion having a slit extending from one end portion to the other end portion, and a flange portion provided at one end portion of the cylindrical portion, the flange portion being cylindrical A bearing bush comprising: a curved base extending from one end of the portion radially outward of the cylindrical portion; and a tip extending from the curved base toward the other end of the cylindrical portion.   The bearing bush according to claim 1, wherein the curved base portion includes a curved convex surface continuously extending from the cylindrical inner surface of the cylindrical portion and another curved convex surface continuously extending from the curved convex surface.   The bearing bush according to claim 2, wherein the curved convex surface and the other curved convex surface have the same curvature.   The bearing bush according to claim 1, wherein the curved base portion includes a curved convex surface continuously extending from the cylindrical inner surface of the cylindrical portion, and a flat surface continuously extending from the curved convex surface.   The bearing bush according to any one of claims 1 to 4, wherein the curved base portion includes a curved concave surface continuously extending from a cylindrical outer surface of the cylindrical portion.   The bearing bush according to any one of claims 1 to 5, wherein the distal end portion is inclined and extended from the curved base portion toward the other end portion of the cylindrical portion.   The bearing bush according to claim 6, wherein the distal end portion has a flat surface inclined from the curved base portion toward the other end portion of the cylindrical portion on one end portion side of the cylindrical portion.   The bearing bush according to claim 6 or 7, wherein the distal end portion has a flat surface inclined toward the other end portion of the cylindrical portion from the curved base portion on the other end portion side of the cylindrical portion.   The bearing bush according to any one of claims 1 to 5, wherein the tip end portion is curvedly extended from the curved base portion toward the other end portion of the cylindrical portion.   The bearing bush according to claim 9, wherein the tip has a curved convex surface on one end side of the cylindrical portion.   The bearing bush according to claim 9 or 10, wherein the tip has a curved concave surface on the other end side of the cylindrical portion.   The bearing bush according to any one of claims 1 to 11, wherein the cylindrical portion and the flange portion are integrally formed from a synthetic resin, a non-ferrous metal plate, or a stainless steel plate.   The cylindrical part and the flange part are made of a steel sheet, a multilayer metal plate comprising a porous metal sintered layer integrally formed on the steel sheet, and a synthetic resin layer filled and coated with the porous metal sintered layer. The bearing bush according to claim 1, wherein the bearing bush is integrally formed.   The bearing bush according to claim 13, wherein the cylindrical inner surface of the cylindrical portion and the annular surface of the flange portion extending continuously from the cylindrical inner surface are formed from the surface of a synthetic resin layer. A shaft member to which one connecting member is fixed and another one connecting member is mounted so as to be movable in the axial direction, and the bearing bush according to claim 1. And a connecting mechanism that connects the one connecting member and the other connecting member to each other so that the other connecting member is rotatable relative to the one connecting member around the axis. The cylindrical portion of the bearing bush is provided between the shaft member and the other connecting member so as to ensure relative rotation around the axis of the shaft member of the other connecting member with respect to the shaft member. The flange portion of the bearing bush is disposed in a gap between the one connecting member and the other connecting member in the axial direction, and the other connecting member Is connected to one connecting member through the flange in the axial direction. Mechanism.

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