JP2018086904A - Power seat slide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power seat slide device which enables members, such as a fixing member, to be arranged in a space between wall surfaces of a bracket including the pair of wall surfaces without forming gaps and enables insertion work of each member to be easily performed.SOLUTION: A power seat slide device includes: a nut member fixed to one side of the floor side and the seat side; a rod screw member which is disposed at the other side and threadedly engages with the nut member; a fixed member fixed to the rod screw member; a bracket fixed to the other side and including a pair of wall parts which are provided so as to sandwich a pair of end surfaces of the fixed member and are respectively formed with bracket through holes through which the rod screw member penetrates; and a pressing member provided with an insertion part which penetrates through the bracket through hole of the pair of wall parts toward the fixed member and is fixed in a protruding state. The pressing member is fixed to the bracket so as to determine relative positions of the bracket and the fixed member in a state where faces of members located adjacent in a fore and aft direction contact with each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power seat slide device.

  2. Description of the Related Art Conventionally, a power seat slide device that moves and adjusts the position of a vehicle seat (seat) in the longitudinal direction of the vehicle using power such as a motor is known (for example, Patent Document 1). The power seat slide device includes, for example, a motor on the seat side, and a rod screw member that is rotationally driven by the motor and screwed with a nut member fixed on the floor side. In such a power seat slide device, the rod screw member may swell during rotation due to an assembly error of the rod screw member or the nut member, dimensional variation of each member (component), or the like. The waviness of the bar screw member may cause a change in rotational resistance during rotation, and the rotation speed of the bar screw member may become unstable. As a result, smooth sheet movement may be hindered or abnormal noise or vibration may occur. Therefore, there is one that employs a power transmission member that includes a sliding mechanism that smoothens the rotational drive of the rod screw member. The power transmission member includes a fixing member fixed to a part of the rod screw member, and a bracket including a pair of wall portions fixed to the seat side and provided to sandwich the pair of end surfaces of the fixing member in the vehicle front-rear direction. And a bush member disposed between the pair of wall portions and slidably disposed in the vehicle front-rear direction. The sliding surfaces of the fixing member and the bushing member are, for example, concave and convex curved shapes that fit with each other. By sliding the fixing member and the bushing member on the curved surface, the undulation action of the bar screw member rotates the rod screw member. To avoid the load. As a result, the rotational speed of the bar screw member is stabilized, and the occurrence of abnormal noise and vibration during sheet movement is reduced.

JP 2013-173516 A

  As described above, when a member such as a fixing member is inserted and arranged in a space formed by a pair of wall portions, adjacent members are arranged in contact with each other without leaving a gap. It is desirable. However, it is difficult to push a member having the same length as the length of the space (gap length, relative distance) formed by the pair of wall portions into the space, resulting in poor working efficiency. For this reason, it is conceivable to set the length of the member to be arranged shorter than the gap length. However, a gap is created before and after the fixed member, and a hitting sound is generated during operation and the fixed member slides smoothly. In some cases, it was not possible.

  Accordingly, one of the objects of the present invention is, for example, a power seat slide in which a member such as a fixing member can be arranged without a gap in a space between each wall surface of a bracket having a pair of wall surfaces, and the insertion work of each member is easy. Is to get the equipment.

  A power seat slide device according to an embodiment of the present invention includes a nut member fixed to one side of a vehicle floor side and a seat side, and the vehicle side in the front-rear direction of the floor side and the seat side. A bar screw member screwed into the nut member, a fixing member fixed to the bar screw member, and a bracket fixed to the other side of the floor side and the seat side, A bracket provided with a pair of wall portions provided so as to sandwich a pair of end surfaces provided on the front and rear sides of the fixing member and having a bracket through-hole through which the rod screw member passes, and one of the pair of wall portions A pressing member provided with an insertion portion that is fixed in a state of projecting toward the fixing member through the bracket through-hole of the portion, and the pressing member is between the pair of wall portions , Serial face of member adjacent to the front-rear direction are fixed to the bracket so as to determine the relative position between the bracket and the fixing member while in contact with each other.

  A power seat slide device according to an embodiment of the present invention includes, for example, at least one bush in which a bush through-hole through which the bar screw member passes is formed between an inner wall surface of the wall portion and an end surface of the fixing member. A member may be provided, and the pressing member may contact the surfaces of the members adjacent in the front-rear direction with the bush member interposed therebetween.

  The distal end of the insertion portion of the power seat slide device according to the embodiment of the present invention is, for example, a non-circular pressing engagement portion that engages with a non-circular restriction engagement portion provided on the end surface of the bush member. May be provided.

  The pressing member of the power seat slide device according to the embodiment of the present invention includes, for example, the bracket penetrating that is connected to the insertion portion and contacts the outer wall surface of the wall portion to restrict the insertion amount of the insertion portion. You may have the head of the outer shape larger than a hole.

  The said insertion part of the power seat slide apparatus concerning embodiment of this invention may be provided with the external thread part screwed together with the internal thread part formed in the said bracket through-hole, for example.

  The pressing member of the power seat slide device according to the embodiment of the present invention may include, for example, an engaging recess that engages with a tool for screwing the male screw portion of the insertion portion into the female screw portion. .

  In the power seat slide device, even when the length of the member inserted between the pair of wall portions is set to be shorter than the distance between the pair of wall portions so as to be easily inserted, the relative position between the bracket and the fixing member is set. After the determination, the surfaces of members adjacent in the front-rear direction come into contact with each other. As a result, the operation when inserting the member between the pair of wall portions is easy, and the members after the insertion are in contact with each other, so that rattling of the member is suppressed.

FIG. 1 is a perspective view of a vehicle seat on which the power seat slide device of the present embodiment is installed. FIG. 2 is a schematic cross-sectional view illustrating the overall configuration of the power seat slide device of the present embodiment. FIG. 3 is an exploded perspective view of a load transmission mechanism included in the power seat slide device of FIG. FIG. 4 is a cross-sectional view of the load transmission mechanism shown in FIG.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. According to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration. In the present specification, the ordinal numbers are given for convenience in order to distinguish members (parts), parts, and the like, and do not indicate priority or order.

  The overall configuration of the vehicle seat on which the power seat slide device of the present embodiment is installed will be described with reference to FIG. The power seat slide device is located between the seat S and the floor surface F in the vehicle interior of the vehicle. The power seat slide device includes a pair of left and right seat tracks 10 extending in the longitudinal direction X (front direction Xa, rear direction Xb) of the vehicle. The left and right seat tracks 10 have the same (symmetric) structure, the lower rail 16 fixed to the front bracket 12 and the rear bracket 14 arranged on the floor surface F so as to be separated from each other in the front-rear direction X, and the seat seat of the seat S And an upper rail 18 fixed to the back side of the portion Sa. And the upper rail 18 which supports the sheet | seat S is engaged with the lower rail 16 fixed to the floor surface F side so that the movement to the front-back direction X is possible. The seat S may include a reclining mechanism for reclining the backrest Sb with respect to the seat seat portion Sa, a tilt mechanism for tilting the seat seat portion Sa, a lifting mechanism for raising and lowering the seat seat portion Sa, and the like. The reclining mechanism may be provided, for example, at a portion connecting the seat seat portion Sa and the backrest Sb, and the tilt mechanism and the lifting mechanism may be provided between the power seat slide device and the seat seat portion Sa.

  Next, the overall configuration of the power seat slide device 20 will be described with reference to FIG. In FIG. 2, the lower rail 16 and the upper rail 18 are arranged along the longitudinal direction X of the vehicle. A bar screw member 22 is disposed on the upper rail 18 along the longitudinal direction (front-rear direction X). A male screw portion 22a is formed on the peripheral surface of the central portion of the bar screw member 22. One end side (front side, front direction Xa side) of the rod screw member 22 is connected to the male screw portion 22a and has an outer diameter set smaller than the outer diameter of the male screw portion 22a. The small diameter step part 22b in which the part is not formed is formed. Further, a serration portion is provided on the distal end side of the bar screw member 22 so as to be connected to the small diameter step portion 22b, the outer diameter is set smaller than the outer diameter of the small diameter step portion 22b, and a serration extending in the axial direction is formed on the peripheral surface. 22c is formed. On the other end side (rear part side, rear direction Xb side) of the bar screw member 22, a straight-shaped support part 22d that is connected to the male screw part 22a and does not have a screw part is formed. A screw bracket 24 into which the support portion 22 d at the end of the bar screw member 22 is inserted is attached to the upper rail 18. The screw bracket 24 includes a taper-shaped support hole whose diameter gradually decreases toward the back side that rotatably supports the bar screw member 22.

  A nut member 26 is fixed to the lower rail 16 in a state of being housed in a nut housing 28. The nut member 26 has a through hole formed in the insertion direction of the bar screw member 22, and a female screw portion 26 a is formed on the inner peripheral surface of the through hole. The female screw portion 26a of the nut member 26 and the male screw portion 22a of the bar screw member 22 are screwed together. The nut housing 28 is provided so as to cover the nut member 26. In a space between the inner surface of the nut housing 28 and the outer surface of the nut member 26, a vibration absorbing member, for example, a rubber sheet may be provided. On the lower surface of the nut housing 28, fixing female screw portions 28a are formed, for example, at two locations. Further, the nut member 26 has a clearance hole at a position corresponding to the position where the fixing female screw portion 28a is formed, and has a diameter larger than that of the fixing female screw portion 28a and escapes the tip of the bolt 30 screwed with the fixing female screw portion 28a. 26b is formed. The lower rail 16 is formed with a through hole 16a having a diameter larger than that of the fixing female screw portion 28a at a position corresponding to the fixing female screw portion 28a and the escape hole 26b. Therefore, the nut housing 28 is fixed to the lower rail 16 by the bolts 30 that are inserted into the through holes 16a and screwed into the fixing female screw portions 28a.

  A bent portion 18a that is bent upward is formed at one end of the upper rail 18 (front, front end Xa end). A gear box 32 is fixed to the bent portion 18a.

  The gear box 32 includes a gear housing 34 and a cover 36 that covers the upper portion of the gear housing 34 and to which the gear housing 34 is attached. A gear is formed by a through hole 36 a formed in the cover 36, a through hole 34 a formed in the gear housing 34, a bolt 38 inserted through the through hole 18 b formed in the bent portion 18 a, and a nut 40 screwed into the bolt 38. The box 32 is attached and fixed to the bent portion 18 a of the upper rail 18.

  In the gear housing 34, there is provided a gear reduction mechanism including a worm 42 driven by a motor (not shown) and a worm wheel 44 into which the worm 42 is screwed. A serration portion 44a is formed on the inner peripheral surface of the through hole formed along the rotation center axis of the worm wheel 44 on the output side of the gear reduction mechanism. The serration portion 22 c of the bar screw member 22 is fitted into the serration portion 44 a of the worm wheel 44. By this serration fitting, the worm wheel 44 and the rod screw member 22 rotate together in a state where relative movement in the rotation axis direction (front-rear direction X) is allowed.

  When the rod screw member 22 is rotationally driven by a motor (not shown), the rod screw member 22 moves forward and backward with respect to the nut member 26 fixed to the lower rail 16. That is, the upper rail 18 moves in the front-rear direction X along the lower rail 16. Since the seat S is fixed to the upper rail 18 as described above, the seat S can move in the front-rear direction X with respect to the floor surface F.

  In the present embodiment, the bar screw member 22 and the upper rail 18 are also connected by a load transmission mechanism 46. The load transmission mechanism 46 supports a fixing member 48 fixed to a part of the bar screw member 22, a plurality of bush members that rotatably support the fixing member 48, and the fixing member 48 and the plurality of bush members. The bracket 50 is fixed to the upper rail 18. That is, the load acting on the seat S is transmitted to the floor surface F via the upper rail 18, the load transmission mechanism 46, the rod screw member 22, the nut member 26, the nut housing 28, and the lower rail 16.

  3 is an exploded perspective view of the load transmission mechanism 46, and FIG. 4 is a cross-sectional view of the load transmission mechanism 46.

  As shown in FIG. 3, the load transmission mechanism 46 includes a bracket 50, a fixing member 48, a plurality of bush members (a front fixing bush member 52 (fixing side bush member), a rear fixing bush member 54 (fixing side bush member), a wall surface. Side bush member 56), elastic member 58, pressing member 60, and the like.

  As shown in FIGS. 3 and 4, the bracket 50 has a pair of wall portions 62 (a front wall portion 62 a and a rear wall portion 62 b) fixed so as to sandwich a pair of end surfaces in the front-rear direction X of the fixing member 48. The cross section of the front-back direction X connected by the connection part 64 provided so that the member 48 may be straddled in the front-back direction X is a substantially C-shaped member. The bracket 50 is made of metal (for example, iron), and a bracket through-hole through which the bar screw member 22 can penetrate at a substantially central portion in the front-rear direction X of the wall portion 62 (the front wall portion 62a and the rear wall portion 62b). 66 (front through hole 66a, rear through hole 66b) is formed. In the case of the present embodiment, as shown in FIG. 4, a female screw portion 66 c that is screwed with a male screw portion 60 a of a pressing member 60 that is a bolt, for example, is formed on the inner peripheral surface of the front through hole 66 a. On the other hand, the threaded portion is not formed on the inner peripheral surface of the rear through hole 66b.

  A through hole 64a penetrating in the vertical direction of the vehicle is formed at a substantially central portion of the connection portion 64 of the bracket 50 in the front-rear direction X. Bolts 68 are inserted into the through holes 64a, and the bracket 50 is fixed to the upper rail 18 by nuts 70 as shown in FIG. The fixing of the bracket 50 to the upper rail 18 is not limited to the fastening by the bolt 68 and the nut 70, and other techniques such as welding may be used.

  In the space formed by the front wall portion 62a and the rear wall portion 62b facing each other in the bracket 50, the front fixed bush member 52, the fixed member 48, the rear fixed bush member 54, the elastic member 58, and the wall surface side bush member 56 are arranged. Is done. These accommodating members are arranged along the axial direction (front-rear direction X) of the bar screw member 22 that passes through the front through hole 66a and the rear through hole 66b. That is, at least one bush member provided with a bush through hole through which the bar screw member 22 passes is disposed between the inner wall surface of the wall portion 62 of the bracket 50 and the end surface of the fixing member 48.

  As described above, the fixing member 48 is a member that is fixed to a part of the bar screw member 22 and rotates together with the bar screw member 22, for example, made of metal. In the case of the present embodiment, the fixing member 48 is, for example, a cylindrical member, and as shown in FIG. 4, a female screw portion 48 a is formed on the inner peripheral surface. The female screw portion 48a has a screw diameter slightly smaller than the screw diameter of the male screw portion 22a of the rod screw member 22, for example, and can be fixed by screwing the fixing member 48 into the male screw portion 22a in a press-fit state. Alternatively, the inner diameter of the female screw portion 48a of the fixing member 48 may be formed so as to correspond to the screw diameter of the male screw portion 22a and fixed by caulking, welding, or the like.

  In the fixing member 48 of the present embodiment, one front end surface 72a and the other rear end surface 72b in the front-rear direction X are, for example, convex curved surfaces as shown in FIG. The convex curved surfaces of the front end surface 72a and the rear end surface 72b can be, for example, part of a spherical surface centered at a point O that is the intersection of the rotation axis of the rod screw member 22 and the rotation axis of the bolt 68.

  A front fixed bushing member 52 that is in sliding contact with the front end surface 72a is disposed on the front side in the front-rear direction X of the fixing member 48. The front fixed bushing member 52 is formed of, for example, resin, and, as shown in FIG. 3, for example, is a block-shaped member having a substantially square cross section in a direction orthogonal to the front-rear direction X, and a bush through hole through which the bar screw member 22 passes. 52a is formed. Further, the rear end surface 52 b of the front fixed bushing member 52 is formed with a concave curved surface corresponding to the convex curved surface of the front end surface 72 a of the fixing member 48. That is, the concave curved surface of the rear end surface 52 b is a part of a spherical surface centering on a point O that is an intersection of the rotation axis of the rod screw member 22 and the rotation axis of the bolt 68.

  In the front fixed bush member 52, the front end face 52c opposite to the rear end face 52b, that is, the end face opposite to the fixed member 48 is pressed to restrict the movement of the front fixed bush member 52 in the front-rear direction X. A restricting engagement portion 52d (engagement support portion) is formed in which a pressing engagement portion 60c formed in the insertion portion 60b of the member 60 (restriction member) is engaged. The restriction engagement portion 52d formed on the front fixed bushing member 52 and the pressing engagement portion 60c formed on the distal end side of the insertion portion 60b of the pressing member 60 are both non-circular, and when engaged, The relative rotation of both is restricted. The pressing member 60 is fixed to the bracket 50 by the male screw portion 60 a being screwed with the female screw portion 66 c of the bracket 50. Therefore, the front fixing bush member 52 is disposed between the front wall portion 62a and the fixing member 48 in a state where rotation is restricted with respect to the bracket 50 via the pressing member 60 (non-rotatable state).

  On the rear side of the fixing member 48 in the front-rear direction X, a rear fixing bush member 54 that is in sliding contact with the rear end surface 72b is disposed. The rear fixed bushing member 54 is formed of, for example, resin, and as shown in FIG. 3, as in the case of the front fixed bushing member 52, for example, a block-shaped member having a substantially square cross section in the direction orthogonal to the front-rear direction X. A bush through hole 54a through which the member 22 passes is formed. Further, the front end surface 54b of the rear fixed bush member 54 that is in sliding contact with the rear end surface 72b of the fixing member 48 is formed with a concave curved surface corresponding to the convex curved surface of the rear end surface 72b. That is, the concave curved surface of the front end surface 54 b is a part of a spherical surface centering on a point O that is an intersection of the rotation axis of the rod screw member 22 and the rotation axis of the bolt 68. In another embodiment, the curvature of the concave curved surface of the rear end surface 52 b of the front fixed bush member 52 may be smaller than the curvature of the front end surface 72 a of the fixing member 48. Similarly, the curvature of the concave curved surface of the front end surface 54b of the rear fixed bush member 54 may be smaller than the curvature of the rear end surface 72b of the fixing member 48. As described above, by reducing the curvature on the front fixed bushing member 52 side and the curvature on the rear fixed bushing member 54 side, even if an assembly error or dimensional error of each sliding component occurs, the front fixed bushing member 52, the rear fixed bush member 54 can receive the fixed member 48 as a point contact (single point contact), and it is easy to avoid an increase in sliding resistance.

  In the rear fixed bush member 54, a support portion 54d (engagement support portion) that supports the elastic member 58 is provided on the rear end surface 54c side opposite to the front end surface 54b, that is, on the end surface side opposite to the fixing member 48. Is formed. The support portion 54d may be a groove that is slightly larger than the outer diameter shape of the elastic member 58 and that is recessed in the front direction Xa so that the elastic member 58 can be supported in a state of protruding a predetermined amount from the rear end surface 54c. . By providing the support portion 54d, when the elastic member 58 is assembled to the bracket 50, it can be temporarily fixed to the rear fixed bush member 54, and the efficiency of the assembly work can be improved.

  As described above, in the present embodiment, the front end surface 72a and the rear end surface 72b of the fixing member 48 have curved shapes (for example, convex curved surfaces), and the rear end surface 52b of the front fixing bush member 52 that contacts these in the front-rear direction X. The front end face 54b of the rear fixed bushing member 54 has a corresponding curved surface shape (for example, a concave curved surface). As a result, for example, even when the rod screw member 22 swells during rotation due to assembly errors of the rod screw member 22 and the fixing member 48, dimensional variations of the respective members, and the like, the front and rear contact surfaces of the fixing member 48 slide along the curved surface. Therefore, the rotational resistance of the bar screw member 22 can be reduced. That is, the bar screw member 22 is easily rotated smoothly, and fluctuations in the rotation speed can be reduced. As a result, the movement of the seat S becomes smooth and generation of vibrations and abnormal noise can be reduced, and the seat S can be moved (slid) in the front-rear direction X stably and smoothly.

  The elastic member 58 is an annular member having a predetermined thickness in the front-rear direction X, for example, formed of a rubber material or an elastomer having an elastic property intermediate between a resin and a rubber material. The elastic member 58 is formed with, for example, a circular damper through hole 58a through which the bar screw member 22 passes. And the hole dimension of the bush penetration hole 54a of the back fixed bush member 54 is set so that it may become smaller than the hole dimension of the damper penetration hole 58a. With this setting, for example, when the bar screw member 22 that rotates integrally with the fixing member 48 that is slidably supported by the front fixing bush member 52 and the rear fixing bush member 54 undulates during rotation, the bar screw member 22 Prior to the elastic member 58, the rear fixed bush member 54 comes into contact. As a result, it is possible to avoid wear and breakage of the elastic member 58 formed of a rubber material or the like that is generally lower in strength than the rear fixed bush member 54 formed of a resin material.

  On the rear side in the front-rear direction X of the rear fixed bush member 54, a wall surface side bush member 56 that is in contact with the rear wall portion 62b of the bracket 50 is disposed as a bush member. In the present embodiment, the elastic member 58 is provided between the rear fixed bush member 54 and the wall surface side bush member 56. The wall surface side bush member 56 is a member that is formed of, for example, metal and has an outer shape of, for example, a substantially rectangular shape. For example, a bracket engagement portion 56 a that engages with the bracket 50 is formed on the outer surface. In the case of this embodiment, the bracket engaging portion 56 a is, for example, a flat portion, engages with the inner wall surface of the connection portion 64 of the bracket 50, and restricts the rotation of the wall surface side bush member 56 relative to the bar screw member 22. To be. In another embodiment, the wall surface side bush member 56 may be made of resin.

  On the rear fixed bush member 54 side of the wall surface side bush member 56, an engagement concave portion 56b that engages so as to wrap a bush engaging portion 54e formed on the outer surface of the rear fixed bush member 54 is formed. Therefore, the rotation of the rear fixed bush member 54 relative to the wall surface side bush member 56 is restricted by the bush engagement portion 54e engaged with the engagement recess portion 56b of the wall surface side bush member 56. Further, since the wall surface side bush member 56 engages with the bracket 50 and the rotation with respect to the bar screw member 22 is restricted, the rear fixed bush member 54 is connected to the bar screw member 22 via the wall surface side bush member 56. On the other hand, rotation is restricted. Therefore, the front fixed bushing member 52 and the rear fixed bushing member 54 that hold (slidably contact) the fixing member 48 are fixed to the bracket 50, so that the rod screw member 22 can be rotated more smoothly.

  As shown in FIG. 4, the wall-side bush member 56 formed of metal is formed in the bracket through hole 66 (rear through hole 66 b) on the surface opposite to the surface in contact with the elastic member 58 in the front-rear direction X. A cylindrical portion 56c to be fitted is provided. By fitting the metal cylindrical portion 56c into the bracket through hole 66, the positioning and movement of the wall surface side bush member 56 with respect to the bracket 50 can be easily performed. Further, since the diameter of the bracket through-hole 66 can be substantially reduced, for example, even when a high load in the front-rear direction X is applied to the load transmission mechanism 46, it is formed on the cylindrical portion 56c and the rear wall portion 62b. The bracket through-hole 66 is not easily deformed, and the possibility that storage members such as the fixing member 48, the front fixing bush member 52, and the rear fixing bush member 54 fall off (jump out) from the rear wall portion 62b can be reduced.

  The pressing member 60 is, for example, a cylindrical bolt having a bolt through hole 60d through which the bar screw member 22 passes, and penetrates the bracket through hole 66 (front through hole 66a) of the front wall portion 62a of the bracket 50. An insertion portion 60b that is fixed in a state of protruding toward the fixing member 48 is provided. The pressing member 60 is disposed between the pair of wall portions 62 (the front wall portion 62a and the rear wall portion 62b) with respect to the bracket 50 and the fixing member 48 in a state where the surfaces of the members adjacent to each other in the front-rear direction X are in contact with each other. It is fixed to the bracket 50 so as to determine the position. That is, the pressing member 60 is screwed into the wall portion 62 (front wall portion 62a) of the bracket 50, and the insertion portion 60b protrudes toward the fixing member 48, so that the space between the front wall portion 62a and the rear wall portion 62b is reached. A plurality of members arranged in the front-rear direction X (the axial direction of the bar screw member 22) are biased to the inner wall surface 62c of the rear wall portion 62b. In other words, the clearance between the front fixing bush member 52, the fixing member 48, the rear fixing bush member 54, the elastic member 58, and the wall surface side bush member 56 is eliminated and the rattling between the respective members is suppressed. it can. Further, it is possible to stabilize the contact between the fixing member 48 that rotates together with the rod screw member 22, the front fixing bush member 52, and the rear fixing bush member 54, and to smoothly rotate the rod screw member 22 (fixing member 48).

  The adjacent members include, for example, the fixing member 48 and the front fixing bush member 52, the fixing member 48 and the rear fixing bush member 54, the rear fixing bush member 54 and the elastic member 58, the elastic member 58 and the wall surface side bush member 56, The wall surface side bush member 56, the rear wall portion 62b, and the like are applicable. Further, for example, when the elastic member 58 is omitted, the rear fixed bushing member 54 and the wall surface side bushing member 56 are adjacent to each other. For example, when the wall surface side bush member 56 is omitted and the elastic member 58 contacts the rear wall portion 62b, the elastic member 58 and the rear wall portion 62b are adjacent to each other.

  The insertion portion 60b of the pressing member 60 includes a male screw portion 60a that engages with the female screw portion 66c of the bracket through hole 66 (front through hole 66a) of the front wall portion 62a. As a result, adjustment of the protruding amount of the insertion portion 60b, that is, fine adjustment of the contact state of each member arranged in the bracket 50 can be easily performed by adjusting the screwing amount of the pressing member 60. Further, the relative positioning of the pressing member 60 with respect to the bracket 50 can be easily and accurately performed.

  The pressing member 60 is connected to the insertion portion 60b, contacts the outer wall surface 62d of the front wall portion 62a, and regulates the insertion state of the insertion portion 60b, and has a larger outer shape than the bracket through hole 66 (front through hole 66a). It has a head 60e. By tightening the pressing member 60 until the head 60e contacts the outer wall surface 62d, the pressing member 60 is tightened with respect to the bracket 50, that is, the insertion amount (protruding state) of the insertion portion 60b is kept constant. Can be regulated as follows. When the pressing member 60 is tightened, the elastic member 58 is compressed, so that the rear fixed bushing member 54 and the wall surface side bushing member 56 are not completely in contact with each other, that is, the elastic member 58 is a predetermined amount or more. It is desirable to set the lengths of the insertion portion 60b and the head 60e so that they protrude from the elastic member 58. Further, the position of the fixing member 48 in the bracket 50 is set so that the insertion portion 60b protrudes so that the center position of the fixing member 48 (the center of the length in the front-rear direction X) is located directly below the rotation center of the bolt 68. Setting is desirable in terms of reducing the influence of waviness during rotation of the bar screw member 22. Further, by maintaining the state where the elastic member 58 protrudes from the rear end surface 54c of the rear fixed bushing member 54 by a predetermined amount or more, the crushing margin of the elastic member 58 is secured. In this case, for example, the variation in the tightening amount of the pressing member 60 can be absorbed by the compression of the elastic member 58, and the variation in the contact state of each member arranged in the bracket 50 can be reduced.

  Note that a portion connected to the bolt through hole 60d on the end side of the head 60e is associated with a tool for screwing the male screw portion 60a of the insertion portion 60b into the female screw portion 66c of the front through hole 66a of the front wall portion 62a. An engaging recess 60f is provided. The engaging recess 60f is, for example, a hexagonal recess, and is engaged with, for example, a hexagonal bar spanner as a tool so that the pressing operation of the pressing member 60 can be easily performed. By forming the engaging recess 60f inside the head 60e, the surface of the head 60e can be formed into a cylindrical shape, for example. For example, when the outer shape of the head 60e of the pressing member 60 is a hexagonal shape that engages a spanner or the like, the spanner is engaged so as to be orthogonal to the axial direction of the bar screw member 22, When the member 60 is tightened, there is a high possibility of interference with other members, and the outer shape of the head 60e for engaging the spanner is increased, which may increase the possibility of interference with other members. is there. On the other hand, by forming the engaging recess 60f on the inner diameter side of the head 60e of the pressing member 60, the outer shape of the head 60e can be reduced in size and the interference with other members can be easily avoided. Further, the tool operation from the axial direction of the bar screw member 22 becomes possible, and the assembling work becomes easy. In addition, the engagement recess 60f can be easily made only by performing additional machining on the bolt through hole 60d.

  The assembly procedure of the load transmission mechanism 46 configured as described above will be described below. As shown in FIG. 4, in the bracket 50, when the opposing distance between the inner wall surface 62f of the front wall portion 62a and the inner wall surface 62c of the rear wall portion 62b is “L0”, the front and rear of each member arranged in the bracket 50 The total dimension L in the direction X needs to be L0> L. Further, in order to easily arrange the members, it is desirable that the total dimension L is sufficiently small with respect to the facing distance L0. However, if the total dimension L is reduced, each member may rattle within the bracket 50, and the front fixed bush member 52, the rear fixed bush member 54, and the fixed member 48 may not be able to slide smoothly. Further, it may cause the swell of the bar screw member 22 to increase, which may impair stable rotation of the bar screw member 22 and may cause fluctuations in the sliding speed of the sheet S, abnormal noise, and vibration.

  On the other hand, in the present embodiment, the longitudinal direction X between the end surface (rear end surface 72b) of the fixing member 48 in the front-rear direction X and the inner wall surface 62c of the wall portion 62 (rear wall portion 62b) facing the end surface. An elastic member 58 that expands and contracts is provided. That is, by compressing the elastic member 58 in the front-rear direction X, the total dimension L in the front-rear direction X of each member arranged in the bracket 50 can be reduced. For example, consider a case where the total dimension when the front fixed bush member 52, the fixed member 48, the rear fixed bush member 54, the elastic member 58, and the wall surface side bush member 56 are arranged in close contact with each other is equal to or greater than the facing distance L0. In this case, it is assumed that the elastic member 58 sufficiently protrudes from the rear end face 54c of the rear fixed bushing member 54 in a state where the compression of the elastic member 58 in the front-rear direction X is zero or the compression margin remains. In this case, the elastic member 58 is crushed in the front-rear direction X by pressing in the front-rear direction X after the front fixed bushing member 52 to the wall surface side bushing member 56 which are the arranged members are in an assembly state, and the total dimension L Can be less than or equal to the facing distance L0. That is, it is possible to easily perform the operation of inserting each member in the assembled state between the inner wall surface 62f of the front wall portion 62a of the bracket 50 and the inner wall surface 62c of the rear wall portion 62b. After the assembly is inserted, the pressing force applied to the front fixed bushing member 52 and the wall surface side bushing member 56 at the time of insertion is released, and the length of the elastic member 58 in the front-rear direction X returns to the state before the pressing. In this case, by appropriately setting the length of the elastic member 58 in the front-rear direction X, the elastic member 58 is compressed to a predetermined amount (pressurized state) even when each member is disposed in the bracket 50. can do. That is, the generation of gaps between the members can be reduced. When the insertion of each member into the bracket 50 is completed, the pressing member 60 is screwed from the outside of the front through hole 66a of the front wall portion 62a. Then, the front fixing bush member 52, the rear fixing bush member 54, the elastic member 58, and the wall surface side bush member 56 are fixed to the bracket 50 while adjusting the relative position of the fixing member 48 with respect to the bracket 50.

  When the assembly of the bracket 50 is completed, the bar screw member 22 into which the nut member 26 is screwed is inserted from the rear through hole 66b of the bracket 50, and the fixing member 48 is fixed to a predetermined position of the bar screw member 22. Further, the serration portion 22 c of the rod screw member 22 is inserted into the serration portion 44 a of the worm wheel 44, and the support portion 22 d of the rod screw member 22 is supported by the screw bracket 24. Then, the load transmission mechanism 46 is fixed to the upper rail 18 using bolts 68 and nuts 70, and the nut housing 28 is fixed to the lower rail 16 using bolts 30 to complete the power seat slide device 20.

  As described above, according to the present embodiment, each member can be easily assembled in the bracket 50, and each member in the bracket 50 can be disposed in a close contact state in the front-rear direction X. As a result, the assembly efficiency of the power seat slide device 20 can be improved, and the sliding of the fixing member 48 and the front fixing bush member 52 and the sliding of the fixing member 48 and the rear fixing bush member 54 can be smoothly performed when the bar screw member 22 rotates. Can be done. That is, even when waviness is generated in the bar screw member 22, occurrence of fluctuations in the rotational speed of the bar screw member 22 due to waviness during rotation of the bar screw member 22 can be reduced by smooth sliding. In other words, it is possible to stabilize the sliding speed of the seat S, reduce the occurrence of vibration during sliding, reduce the occurrence of abnormal noise during sliding, and improve the quality of the power seat sliding device 20.

  Further, as shown in FIG. 3, the elastic member 58 is in contact with the bush end surface 56d on the end surface side (rear end surface 72b side) of the fixing member 48 in the bush member (in the case of FIG. 3, the wall surface side bush member 56). Provided. That is, the elastic member 58 is not arranged at the outermost part when a plurality of members arranged in the bracket 50 are assembled. As a result, the elastic members 58 are not easily twisted when pressing both ends of the members assembled for insertion into the bracket 50 (in the case of FIG. 3, the front fixed bushing member 52 and the wall surface side bushing member 56). The total dimension L in the front-rear direction X can be easily reduced while maintaining the state, and workability can be improved.

  As described above, when importance is attached to the assembling property of each member arranged in the bracket 50, the elastic member 58 may be arranged on the front side in the front-rear direction X of the fixing member 48, and the effects as described above are obtained. be able to. On the other hand, as shown in FIGS. 3 and 4, by arranging the elastic member 58 on the rear side in the front-rear direction X from the fixing member 48, the following effects can be obtained in addition to the above effects. In order to improve the stability when the user is seated on the seat S, the lower rail 16 of the vehicle may be installed to be inclined such that the rear side in the front-rear direction X is lower than the front side. In this case, due to the weight of the seat S, the weight of the user, etc., the bracket 50 connected to the seat S via the upper rail 18 receives a force that moves backward. Even in such a case, the compressed elastic member 58 pushes the rear fixed bush member 54 forward. As a result, even when the seat S (bracket 50) moves rearward, the formation of a gap between the fixing member 48 and the rear fixing bush member 54 is suppressed, and the sliding of the both is ensured. The movement can be performed smoothly.

  In the case of the above-described embodiment, when each member is inserted into the bracket 50, in order to ensure (guarantee) mutual contactability (adhesion) in the front-rear direction X, the protruding amount of the insertion portion 60b of the pressing member 60 To adjust the elastic member 58 to a compressed state. In another embodiment, the elastic member 58 may be omitted, and the occurrence of a gap between the members may be avoided only by adjusting the protruding amount of the insertion portion 60b of the pressing member 60.

  When the elastic member 58 is omitted, the front fixed bush member 52, the fixed member 48, the rear fixed bush member 54, and the wall surface side bush member 56 are arranged in the bracket 50 as assembled members. In this case, the total dimension L in the front-rear direction X of each member arranged in the bracket 50 may be made sufficiently smaller than the facing distance L0 so that it can be easily arranged in the bracket 50. Then, the assembled member is urged against the inner wall surface 62 c of the wall portion 62 by screwing the insertion portion 60 b of the pressing member 60 from the outside of the front wall portion 62 a toward the fixing member 48. That is, the pressing member 60 is configured so that the surfaces of the members adjacent in the front-rear direction X are in contact with each other with the bush members (the front fixed bush member 52, the rear fixed bush member 54, and the wall surface side bush member 56) interposed therebetween. The relative position between the bracket 50 and the fixing member 48 can be determined. As a result, it is possible to prevent a gap from being generated between the members only by adjusting the protruding amount of the insertion portion 60b of the pressing member 60. That is, each member can be easily assembled in the bracket 50, and each member in the bracket 50 can be disposed in a close contact state in the front-rear direction X. As a result, the assembly efficiency of the power seat slide device 20 can be improved and the quality of the power seat slide device 20 can be improved as in the case where the elastic member 58 is used.

  In the above-described embodiment, an example is shown in which the front fixed bush member 52 and the rear fixed bush member 54 are formed of resin, and the wall surface side bush member 56 is formed of metal. The same effect can be obtained even if this is changed. For example, if the bush member is made of metal, the strength can be easily improved. Further, as shown in the present embodiment, by forming the front fixing bush member 52 and the rear fixing bush member 54 with resin, sliding with the fixing member 48 made of metal can be performed smoothly, Contact between metals can be avoided and generation of metal sliding noise can be suppressed. Further, by forming the wall-side bush member 56 of metal, for example, even when a large external force is applied to the vehicle and the seat S (upper rail 18, bracket 50) receives a large load in the front-rear direction X, the inside of the bracket 50 The possibility that the member jumps out from the bracket 50 in the front-rear direction X can be reduced.

  The members arranged in the bracket 50 are an example, and for example, the number of bush members may be increased or decreased as appropriate. For example, in another embodiment, the wall 62 may perform the functions of the front fixed bush member 52 and the rear fixed bush member 54. In this case, a curved surface similar to the rear end surface 52b of the front fixed bush member 52 may be formed on the front end surface of the insertion portion 60b of the pressing member 60. When the rear fixed bushing member 54 and the wall surface side bushing member 56 are omitted, a curved surface similar to the front end surface 54b of the rear fixed bushing member 54 is formed on the front direction Xa side of the elastic member 58 to be elastic with the fixing member 48. The member 58 may slide. In this case, it is desirable to take measures against wear of the elastic member 58 separately. Further, the front fixing bush member 52 may be omitted only on the front side of the fixing member 48, and the configuration shown in FIG.

  In another embodiment, the rear fixed bush member 54 may be omitted. In this case, the front direction Xa side of the elastic member 58 and the wall surface side bush member 56 contacts the rear end surface 72b of the fixing member 48, and the rear direction Xb side of the wall surface side bush member 56 contacts the inner wall surface 62c of the rear wall portion 62b. In this case as well, it is desirable to take measures against wear of the elastic member 58 separately. Further, it is desirable that the wall surface side bush member 56 is made of a resin material or the like so as not to generate an abnormal noise or the like when sliding with the fixing member 48 formed of metal as an example. In another embodiment, the wall surface side bush member 56 may be omitted. In this case, the rear direction Xb side of the elastic member 58 and the rear fixed bush member 54 contacts the inner wall surface 62c of the rear wall portion 62b, and the front end surface 54b of the rear fixed bush member 54 contacts the rear end surface 72b of the fixed member 48. . In this case, it is desirable to appropriately select the arrangement position so that the elastic member 58 does not fit into the bracket through hole 66 even when the elastic member 58 is elastically deformed. Further, FIG. 4 shows an example in which the rear fixed bushing member 54 and the wall surface side bushing member 56 are provided as separate members, and the elastic member 58 is interposed therebetween. In another embodiment, the wall-side bush member 56 is an inner bush member on the side close to the rotation center of the bar screw member 22 and the rear fixed bush member 54 is an outer bush member on the outer side. The elastic member 58 may be built in between the inner bush member and the outer bush member. In this case, the inner bush member contacts the rear end surface 72b of the fixing member 48, and the outer bush member contacts the inner wall surface 62c of the rear wall portion 62b. Further, the inner bush member and the outer bush member can be expanded and contracted in the front-rear direction X by elastic deformation of the elastic member 58. As described above, even when the number of the bush members is appropriately selected, the length of each member in the assembly state by the compression of the elastic member 58 is changed to the length of the inner wall surface 62f and the rear wall portion 62b of the front wall portion 62a of the bracket 50. It becomes possible to make it shorter than the space | interval with the inner wall surface 62c, and an insertion operation | work to the bracket 50 can be performed easily. And after insertion of an assembly, the length of the front-back direction X of the elastic member 58 returns to the state before a press by releasing the pressing force provided at the time of insertion. As a result, in the state where each member is disposed in the bracket 50, the occurrence of a gap between the members can be reduced.

  In another embodiment, the elastic member 58 may be omitted. In this case, a curved surface similar to the rear end surface 52b of the front fixed bush member 52 is formed on the front end surface of the insertion portion 60b of the pressing member 60, and the front end surface of the rear fixed bush member 54 is formed on the inner wall surface 62c of the rear wall portion 62b. A curved surface similar to 54 b may be formed, and the pressing member 60 may determine the relative position of the fixing member 48 with respect to the bracket 50. In this case as well, the fixing member 48 can be easily assembled in the bracket 50, the rattling of the fixing member 48 in the bracket 50 is reduced, and the influence of the undulation during rotation of the bar screw member 22 is reduced. Thus, a smooth slide of the sheet S can be realized, and the occurrence of vibration and abnormal noise can be reduced.

  Moreover, as shown in FIG. 3, the case where the shape of the elastic member 58 of this embodiment was an annular shape was shown. In another embodiment, the outer shape of the elastic member 58 may be the same shape as the pressing engagement portion 60 c of the insertion portion 60 b of the pressing member 60. In this case, the front fixed bushing member 52 and the rear fixed bushing member 54 can use members having the same shape by reversing the front and back in the front-rear direction X during assembly. That is, the member can be shared, which can contribute to cost reduction.

  Moreover, although the elastic member 58 showed the example formed cyclically | annularly with the rubber material or resin in this embodiment, it is not limited to this. In other embodiments, for example, a spring material such as a coil spring or a leaf spring may be used as the elastic member 58. When a spring material is used as the elastic member 58, it is desirable that a plurality of the elastic members 58 be arranged uniformly around the rotation axis of the bar screw member 22. For example, it is desirable that the fixing member 48 and the rear fixing bush member 54 be arranged at intervals of 120 ° or 60 ° so that the fixing member 48 and the rear fixing bush member 54 can be biased without tilting in the front-rear direction X (the axial direction of the bar screw member 22).

  In the present embodiment, the end surface in the front-rear direction X of the fixing member 48 has a convex curved surface shape, and the end surfaces of the front fixed bush member 52 and the rear fixed bush member 54 that slide therewith have a concave curved surface shape. However, the present invention is not limited to this. In another embodiment, for example, a concave curved surface may be formed on the fixed member 48 side, and a convex curved surface may be formed on the front fixed bush member 52 side and the rear fixed bush member 54 side. Further, one end face of the fixing member 48 may be a convex curved surface and the other end may be a concave curved surface. In addition, when the undulation at the time of rotation of the bar screw member 22 (fixing member 48) is reduced by another method, or when it is not necessary to consider the undulation, the end surface of the fixing member 48 and the front fixed bushing member that slides therewith are used. 52, the end face of the rear fixed bushing member 54 may be flat.

  In the embodiment described above, the nut member 26 housed in the nut housing 28 is fixed to the lower rail 16 that is one side of the floor surface F and the seat S, and the upper rail 18 that is the other side of the floor surface F and the seat S is fixed to the lower rail 16. The example which fixed the rod screw member 22, the gear box 32, and the load transmission mechanism 46 arrange | positioned along the front-back direction X was shown. In another embodiment, the rod screw member 22, the gear box 32, and the load transmission mechanism 46 may be fixed to the lower rail 16, and the nut member 26 housed in the nut housing 28 may be fixed to the upper rail 18. Can be obtained. Moreover, in this embodiment, the power seat slide apparatus 20 showed the example containing the lower rail 16 and the upper rail 18. In FIG. In another embodiment, the rod screw member 22, the gear box 32, and the load transmission mechanism 46 are directly fixed to the back side of the seat S, and the nut member 26 housed in the nut housing 28 is directly fixed to the floor surface F. The same effect can be obtained.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example and is not intending limiting the range of invention. The present invention can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. These various forms and modified forms are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. In addition, specifications (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration and shape, etc. are changed as appropriate. can do.

DESCRIPTION OF SYMBOLS 16 ... Lower rail, 18 ... Upper rail, 20 ... Power seat slide apparatus, 22 ... Bar screw member, 46 ... Load transmission mechanism, 48 ... Fixed member, 48a, 66c ... Female screw part, 50 ... Bracket, 52 ... Front fixed bush member, 52a ... bush through hole, 52b, 54c, 72b ... rear end surface, 52c, 54b, 72a ... front end surface, 52d ... regulating engagement part (engagement support part), 54 ... rear fixed bush member, 54a ... bush through hole, 54d: support portion (engagement support portion), 54e: bush engagement portion, 56: wall surface side bush member, 56a ... bracket engagement portion, 56b ... engagement recess, 56c ... cylindrical portion, 56d ... bush end surface, 58 ... Elastic member, 58a ... Damper through hole, 60 ... Pushing member, 60a ... Male screw part, 60b ... Insertion part, 60c ... Pushing engagement part, 60e ... Head part, 60f ... Engagement 62, ... wall part, 62a ... front wall part, 62b ... rear wall part, 62c, 62f ... inner wall surface, 62d ... outer wall surface, 64 ... connection part, 66 ... bracket through hole, 66a ... front through hole, 66b ... Back through hole, F ... floor surface, S ... sheet, X ... front-rear direction.

Claims (6)

A nut member fixed to one of the vehicle floor side and the seat side;
A rod screw member disposed along the front-rear direction of the vehicle on the other side of the floor side and the seat side, and screwed with the nut member;
A fixing member fixed to the rod screw member;
A bracket that is fixed to the other side of the floor side and the seat side, and is formed so as to sandwich a pair of end surfaces provided before and after the fixing member, and a bracket through-hole through which the bar screw member passes is formed A bracket provided with a pair of wall portions,
A pressing member provided with an insertion portion that is fixed in a state of projecting toward the fixing member through the bracket through hole of one of the pair of wall portions;
With
The pressing member is fixed to the bracket so as to determine a relative position between the bracket and the fixing member in a state where the surfaces of the members adjacent in the front-rear direction contact each other between the pair of wall portions. Power seat slide device. Between the inner wall surface of the wall portion and the end surface of the fixing member, at least one bush member having a bush through hole through which the bar screw member passes,
2. The power seat slide device according to claim 1, wherein the pressing member causes the surfaces of the members adjacent in the front-rear direction to contact each other with the bush member interposed therebetween.   The power seat slide device according to claim 2, wherein a distal end of the insertion portion includes a non-circular pressing engagement portion that engages with a non-circular restriction engagement portion provided on the end surface of the bush member.   2. The pressing member according to claim 1, wherein the pressing member includes a head having an outer shape larger than the bracket through-hole that is connected to the insertion portion and abuts against an outer wall surface of the wall portion to regulate an insertion amount of the insertion portion. Item 4. The power seat slide device according to any one of Items 3 to 3.   The power seat slide device according to any one of claims 1 to 4, wherein the insertion portion includes a male screw portion that is screwed into a female screw portion formed in the bracket through hole. The power seat slide device according to claim 5, wherein the pressing member includes an engagement recess that engages with a tool for screwing the male screw portion of the insertion portion into the female screw portion.

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