JP5483410B2 - Power seat truck - Google Patents

Description

  The present invention relates to a power seat truck.

This will be described with reference to FIGS. 9 is a sectional view of the power seat track, FIG. 10 is an exploded perspective view of the nut member of FIG. 9, and FIG. 11 is an enlarged view of the nut member of FIG.
In FIG. 9, an upper rail 103 disposed on the seat side is movably engaged with a lower rail 101 disposed on the vehicle floor.

A screw rod 105 is rotatably supported on the upper rail 103. Further, the screw rod 105 is rotationally driven by a motor (not shown).
A nut member 107 to which the screw rod 105 is screwed is fixed to the lower rail 101.

  Next, the nut member 107 will be described with reference to FIGS. 10 and 11. As shown in these drawings, the nut member 107 is made of a resin having a metal bracket 109 screwed to the lower rail 101 and a female screw hole 111a that is disposed in the bracket 109 and into which the screw rod 105 is screwed. Nut member main body 111 and an elastic damper 113 disposed in a compressed state between the inner surface of the bracket 109 and the outer surface of the nut member main body 111. The damper 113 is provided in order to prevent the vibration from the motor transmitted through the screw rod 105 from being transmitted to the lower rail 1 and the generation of abnormal noise.

Next, the operation of the above configuration will be described.
When a motor (not shown) is driven to rotate, the screw rod 105 rotates. Since the nut member main body 111 of the nut member 107 to which the screw rod 105 is screwed is fixed to the lower rail 101 and is not allowed to rotate, the upper rail 103 moves along the lower rail 101.

  When the upper rail 103 reaches the final position, the rear stopper 105a (see FIG. 11) formed on the screw rod 105 comes into contact with the outer surface of the bracket 109 of the nut member 7, and further movement of the upper rail 103 to the rear is prohibited. Is done.

JP-A-9-164864

  In the power seat track having the above configuration, when the upper rail 103 reaches the last position and the rear stopper 109a of the screw rod 105 is in contact with the outer surface of the bracket 109, and the motor is further driven, the damper 113 moves in the axial direction of the screw rod 105. To compressive deformation. Since the damper 113 is made of an elastic material, when the load is released, the damper 113 returns elastically.

  However, when the amount of compressive deformation of the damper 113 is large, if the deformation continues for a long time or is deformed at a high temperature, the damper 113 does not return elastically and becomes a permanent deformation. A backlash in the moving direction of the upper rail 103 is generated between the outer surface of the nut member main body 111 and the damper 113 or between the damper 113 and the inner surface of the bracket 109.

Therefore, when the motor is driven and the upper rail 103 moves with respect to the lower rail 101, absorption of motor vibration by the damper 113 is deteriorated and abnormal noise is generated.
When the upper rail 103 is stationary with respect to the lower rail 101, the upper rail 103 can move in the front-rear direction by the amount of play, and the seating feeling is poor.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power seat track that does not generate backlash or abnormal noise.

According to a first aspect of the present invention, there is provided a lower rail disposed on a vehicle floor surface, an upper rail that is movably engaged with the lower rail and disposed on a seat side, and one of the upper rail and the lower rail. a threaded rod which is supported lifting the screwed on the threaded rod, and a nut member fixed to the other rail of the upper rail and the lower rail, the nut member, a bracket secured to the other rail And the bracket restricts the movement of the upper rail in the moving direction, and is arranged between the nut member main body having a female screw hole into which the screw rod is screwed, and the inner surface of the bracket and the outer surface of the nut member main body. in the power seat track comprising a damper having an elastic, provided with a stopper mechanism for restricting the upper rail elastic deformation of the moving direction of the damper, the The topper mechanism is provided on one of the end surface of the nut member main body on the moving direction side of the upper rail and the surface of the bracket facing the nut member main body, and extends in the moving direction of the upper rail. A projection provided in the damper, a through-hole through which the projection is inserted, an end surface of the nut member body on which the projection can abut through the through-hole, on the moving direction side of the upper rail, and the bracket And the other surface of the surface facing the nut member main body, and the protrusion has the upper rail of the nut member main body when a load in the moving direction of the upper rail is not acting on the nut member. the end faces, especially that it is set so as not to contact the other surface of said nut member body and the opposite sides of the bracket in the moving direction of the It is a power seat track to.

According to a second aspect of the present invention, there is provided a lower rail disposed on the vehicle floor, an upper rail movably engaged with the lower rail and disposed on the seat side, and any one of the upper rail and the lower rail. A screw rod supported by the screw rod, and a nut member screwed to the screw rod and fixed to the other rail of the upper rail and the lower rail, and the nut member is a bracket fixed to the other rail; The bracket restricts the movement of the upper rail in the moving direction, and has a nut member main body having a female screw hole into which the screw rod is screwed, and elasticity arranged between the inner surface of the bracket and the outer surface of the nut member main body. A power seat track comprising a damper having a stopper mechanism for regulating an elastic deformation amount of the damper in an upper rail movement direction; The topper mechanism is provided on one of the end surface of the nut member main body on the moving direction side of the upper rail and the surface of the bracket facing the nut member main body, and extends in the moving direction of the upper rail. A projection provided on the damper, a bottomed hole into which the projection can be inserted, and an end surface on the moving direction side of the upper rail of the nut member main body through which the projection can be pressed through the bottom of the bottomed hole, The other surface of the bracket facing the nut member main body, and the protrusion and the bottom of the bottomed hole are not subjected to a load in the movement direction of the upper rail on the nut member. in this case, the end surface of the moving direction of the upper rail of the nut member body, not to press the other face of said nut member body and the opposite sides of the bracket It is a feature and be Rupa Lower sheet track set in.

The invention according to claim 3 is characterized in that the screw rod is rotatably supported, and the protrusion is provided on an end surface of the nut member main body on the moving direction side of the upper rail . It is a power seat truck.

According to a fourth aspect of the present invention, the protrusion of the stopper mechanism is provided on an end surface of the nut member body on the movement direction side of the upper rail, and the bracket has an open surface on a side surface along the movement direction of the upper rail. A protrusion that engages the recess on a surface of the damper that faces the surface of the nut member body provided with the recess. The power seat track according to claim 3, wherein the power seat track is provided.

  According to a fifth aspect of the present invention, the bracket is clamped between the nut member main body and the rail to which the nut member is fixed, and the clamp wall is fixed to the rail to which the nut member is fixed. A pair of upstanding walls that stand from both ends of the rail in the extending direction to which the nut member of the sandwiching wall is fixed, and a separating partition that connects the pair of standing walls and faces the sandwiching wall The damper is in contact with the end surface of the nut member main body in the moving direction of the upper rail, and is bent from the bottom portion in contact with the inner surface of the bracket, and the peripheral portion of the bottom portion, and the upper rail of the nut member main body And a cylindrical portion that covers a surface along the moving direction of the base plate, and the cylindrical portion is provided with an elastic convex portion that presses against at least one of the clamping wall and the separation wall of the bracket. Claim characterized by 1 to a power seat track according to any one of the 4.

  According to the first to fifth aspects of the present invention, by providing the stopper mechanism for restricting the amount of elastic deformation of the damper in the upper rail movement direction, the amount of elastic deformation of the damper can be limited, and the damper can be permanently deformed. Can be prevented. As a result, no play or abnormal noise occurs in the power seat track.

Before SL stopper mechanism, the end face of the moving direction of the upper rail of the nut member body, is provided on either side of said nut member body and the opposite sides of the bracket, in the direction of movement of the upper rail An extending projection, a through hole provided in the damper, through which the projection is inserted, an end surface of the nut member body on which the projection can abut through the hole on the moving direction side of the upper rail, the bracket And the other surface of the surface facing the nut member main body, and the protrusion is formed when the load in the movement direction of the upper rail does not act on the nut member. the end surface of the moving direction of the upper rail, that is set so as not to contact the other surface of said nut member body and the opposite sides of the bracket , The damper is elastically deformed load in the moving direction of the upper rail to the nut member acts, the end surface of the moving direction of the protrusions the upper rail of the nut member body, and the nut member body and the opposite sides of the bracket When it contacts the other surface, further elastic deformation of the damper is prohibited. That is, the amount of elastic deformation of the damper is limited, and permanent deformation of the damper can be prevented.

  At this time, a force in the compression direction mainly acts on the protrusion, and almost no bending moment is generated. Therefore, the projection can be easily designed. Moreover, the allowable elastic deformation amount can be easily changed by changing the length of the protrusion.

According to the second aspect of the present invention, the upper rail is provided on either one of the end surface of the nut member main body on the moving direction side of the upper rail and the surface of the bracket facing the nut member main body. A protrusion extending in the moving direction, a bottomed hole provided in the damper, into which the protrusion can be inserted, and an upper rail of the nut member main body through which the protrusion can be pressed through the bottom of the bottomed hole . An end surface on the moving direction side, and the other surface of the surface of the bracket facing the nut member main body, and the bottom of the protrusion and the bottomed hole is in the moving direction of the upper rail to the nut member. If the load is not applied, the end surface of the moving direction of the upper rail of the nut member body, the other surface of said nut member body and the opposite sides of the bracket By being set not pressed, the the damper load acts in the direction of movement of the upper rail to the nut member is elastically deformed, the said nut member body projections through the bottom of the blind hole of the damper The other surface of the end surface on the moving direction side of the upper rail and the surface of the bracket facing the nut member main body is pressed. When the load acting on the nut member increases, the protrusion breaks the bottom of the bottomed hole of the damper, and the protrusion faces the end surface of the nut member body on the moving direction side of the upper rail and the nut member body of the bracket. When it comes into contact with the other of the surfaces to be moved, further elastic deformation of the damper is prohibited.

  Further, when the load acting on the nut member is increased, the bottom portion of the bottomed hole of the damper that has been pressed and deformed by the protrusion may not be compressed and deformed. Even in this case, further elastic deformation of the damper is prohibited.

And the elastic deformation amount of a damper is restrict | limited and the permanent deformation | transformation of a damper can be prevented.
At this time, a force in the compression direction mainly acts on the protrusion, and almost no bending moment is generated. Therefore, the projection can be easily designed. Moreover, the allowable elastic deformation amount can be easily changed by changing the length of the protrusion.

  According to the invention which concerns on Claim 4, the said bracket has an open surface in the side surface along the moving direction of the said upper rail, provided a recessed part in the end surface at the side of the moving direction of the said upper rail of the said nut member main body, The said recessed part By providing a convex portion that engages the concave portion on the surface of the damper that faces the surface of the nut member main body provided with the damper, it is possible to prevent the damper from elastically deforming and escaping to the open surface of the bracket. .

  According to the invention which concerns on Claim 5, the said bracket is clamped between the said nut member main body and the said rail to which the said nut member was fixed, and the clamp fixed to the said rail to which the said nut member was fixed. A wall, a pair of upright walls standing from both ends in the extension direction of the rail to which the nut member of the sandwiching wall is fixed, and a separating partition that connects the pair of standing walls and faces the sandwiching wall The damper is in contact with the end surface of the nut member body on the moving direction side of the upper rail, and is bent from a bottom portion that is in contact with the inner surface of the bracket, and a peripheral portion of the bottom portion. It is a bottomed cylindrical shape composed of a cylindrical portion that covers a surface along the moving direction of the upper rail, and an elastic convex portion that presses against at least one of the clamping wall and the separation wall of the bracket on the cylindrical portion. By providing Pas assembly of it is easy.

It is a figure which shows the invention part of embodiment, Comprising: It is a disassembled perspective view around the nut member of FIG. 1 is a longitudinal sectional view showing an embodiment of a power seat track according to the present invention. 1 is a perspective view showing a general configuration of a vehicle seat track. It is a longitudinal cross-sectional view which shows the model example of a deformation | transformation of the nut member at the time of the collision of the power seat track | truck by this invention. It is the perspective view seen from the different direction of the nut member of FIG. It is the perspective view seen from the different direction of the damper of FIG. It is the perspective view seen from the different direction of the damper of FIG. It is a figure explaining other embodiment. It is sectional drawing of a power seat track. It is a disassembled perspective view of the nut member of FIG. FIG. 10 is an enlarged view of the nut member of FIG. 9.

  As shown in FIG. 3, the vehicle seat track includes a pair of left and right seat tracks 10 that are located between the vehicle seat S and the floor F and extend in the vehicle front-rear direction. The left and right seat tracks 10 have the same (symmetric) structure and are fixed to the floor F with front and rear brackets 11 and 12.

The seat track 10 includes a lower rail 13 and an upper rail 14 fixed to the seat S. The upper rail 14 is movably engaged with the lower rail 13.
As shown in FIG. 2, the lower rail 13 is fixed with a nut member 16 whose axis is directed in the front-rear direction via a fixing screw 16G. As shown in FIG. 2 and FIG.
A nut member body (threaded member) 16A made of a synthetic resin (for example, PA) in the center, a bracket 16B made of metal (for example, iron-based material) surrounding the nut member body 16A, and an inner surface of the bracket 16B It consists of an elastic damper 16C disposed between the outer surface of the nut member main body 16A.

  The nut member main body 16A has a rectangular shape as a whole, and a female screw hole 16D is formed at the center thereof. The bracket 16B has a rectangular shape in side view surrounding the nut member main body 16A.

  The bracket 16B stands from the lower rail (nut member support rail) 13, the sandwiching wall 16B1 sandwiched between the bracket 16B, and both ends of the sandwiching wall 16B1 in the front-rear direction (extension direction of the lower rail 13). The pair of upstanding walls 16B2 and a separation wall 16B3 connecting the upper ends of the pair of upstanding walls 16B2. The pair of standing walls 16B2 are parallel wall surfaces orthogonal to the sandwiching wall 16B1 (lower rail 13), and the separation partition wall 16B3 is parallel to the sandwiching wall 16B1. The clamping wall 16B1 is divided at the central portion (the bracket 16B is formed by bending a plate material, and the divided portion is present in the bracket 16B), and the fixing screw insertion holes 16B4 are formed on both sides of the divided portion. Is drilled. A through hole 16B5 through which the screw rod 20 is inserted is formed in the pair of standing walls 16B2. The pair of upright walls 16B2 functions to inhibit the movement of the upper rail 14 of the nut member main body 16A in the moving direction.

The lower rail 13 has a pair of fixing screw insertion holes 13a corresponding to the pair of fixing screw insertion holes 16B4. The nut member body 16A has a pair of fixing screw insertion holes 16B4 and a fixing screw insertion hole 13B. A pair of fixed female screw holes 16F are formed corresponding to the above.

  The fixing screw 16G inserted into the fixing screw insertion hole 13B and the fixing screw insertion hole 16B4 from the lower surface of the lower rail 13 is screwed into the fixing female screw hole 16F, and the nut member 16 is fixed to the mounting hole of the lower rail 13. .

  A screw rod 20 that is screwed into the female screw hole 16 </ b> D of the nut member 16 is rotatably supported on the upper rail 14. That is, the upper rail 14 is provided with a gear box 30 and a bearing member 17 that rotatably support the front end portion and the rear end portion of the screw rod 20 at the front end portion and the rear end portion thereof. In this order from the front end portion, the serration portion 21, the screwless portion 22, the (crash nut screwing portion 23, the screwless portion 24), the main nut screwing portion 25 screwed into the female screw hole 16D of the nut member 16, and the bearing A screwless portion (rear end bearing portion) 26 that is rotatably supported by the member 17 is formed.

  The gear box 30 is fixed to the upper rail 14 by a connection bracket 31. In the gear box 30, a worm wheel 32 having a serration hole 32a that engages with the serration portion 21 so as not to rotate relative to the shaft portion is rotatably supported. The worm wheel 32 meshes with a worm 33 whose axis is directed in the vehicle left-right direction. When the worm 33 rotates in the forward and reverse directions, the worm wheel 32 rotates in the forward and reverse directions, and the serration portion 21 (screw rod 20) rotates in the forward and reverse directions. Rotate to.

The worm 33 in the gear box 30 of the left and right upper rails 14 is rotated in conjunction with the interlocking mechanism, and the threaded rod 20 of the left and right upper rails 14 is rotated in the forward and reverse directions by this interlocking rotation. Then, since the screw rod 20 is screwed with the nut member 16 fixed to the lower rail 13, the upper rail 14 (seat S) moves back and forth. FIG. 2 shows the forward moving end of the upper rail 14 (seat S) with respect to the lower rail 13.

  Further, a load transmission member 40 that is rotatable relative to the screw rod 20 and moves together with the screw rod 20 in the axial direction (in which axial movement is restricted) is fixed to the upper rail 14. The load transmitting member 40 includes a first annular portion 41 and a second annular portion 41 ′ having screw rod insertion holes 41 a and 41 a ′ through which the screw rod 20 is inserted (slowly passed), and a bolt portion for fixing to the upper rail 14. 42 in an integrated manner. As shown in FIG. 2, the bolt portion 42 is inserted into the fastening hole 31 a formed in the connection bracket 31 of the gear box 30 and the fastening hole 14 a formed in the upper rail 14, and then the fixing nut 44 is screwed into the protruding end. The load transmitting member 40 is fixed to the upper rail 14 (gear box 30) by tightening and tightening.

  A crush nut 27 is screwed into the front portion of the main nut screwing portion 25 of the screw rod 20 so as to be positioned between the annular portions 41 and 41 ′ of the load transmission member 40. The relative movement of the member 40 in the axial direction with respect to the screw rod 20 is restricted.

  In the above seat track, when a collision load is applied, the upper rail 14 tends to move relative to the lower rail 13, and the load is transmitted from the annular portions 41, 41 ′ of the load transmission member 40 via the crash nut 27. The screw rod 20 is added. For this reason, the load applied to the gear box 30 portion can be reduced, and damage to the gear box 30 (worm wheel 32, worm 33) can be prevented.

  Further, when a longitudinal displacement occurs between the screw rod 20 (upper rail 14) and the lower rail 13 (floor surface F), the nut member 16 screwed with the screw rod 20 is brought together with the screw rod 20 together. Try to move. More specifically, the nut main body portion 16A of the nut member 16 pushes one of the pair of standing walls 16B2 of the bracket 16B, and as a result, the pair of standing walls 16B2 is in a direction in which the orthogonality with the sandwiching wall 16B1 is broken. Due to plastic deformation, the distance between the separating partition wall 16B3 and the sandwiching wall 16B1 is reduced (FIG. 4). In FIG. 4, the shape of the bracket 16B before deformation is indicated by a chain line. As described above, when the distance between the separation wall 16B3 and the sandwiching wall 16B1 is narrowed (when the bracket 16B that is rectangular in a side view is deformed into a rhombus), the nut member main body 16A between the both walls is crushed, and the screw rod 20 Increase the meshing force. Accordingly, it is possible to reduce the possibility that the seat S runs away from the floor surface F and to improve the collision safety.

  And in this embodiment, the stopper mechanism 51 which regulates the elastic deformation amount of the moving direction of the upper rail 14 of the damper 16C is provided. The stopper mechanism 51 will be described with reference to FIGS.

  As shown in FIGS. 1 and 5, a pair of protrusions 53 extending in the moving direction of the upper rail 14 are provided on both sides of the female screw hole 16D on the end surface on the moving direction side of the upper rail 14 of the nut member main body 16A. Is formed.

  On the other hand, as shown in FIGS. 1, 6 and 7, the damper 16C is in contact with the end surface of the nut member main body 16A on the moving direction side of the upper rail 14, and is in contact with the inner surface of the upright wall 16B2 of the bracket 16B. The bottom portion 55 has a bottomed cylindrical shape including a cylindrical portion 57 that is bent from the peripheral portion of the bottom portion 55 and covers a surface of the nut member main body 16 </ b> A along the moving direction of the upper rail 14. The cylinder part of this embodiment is composed of a bottom part 57A, a top part 57B, and side parts 57C and 57D. A hole 55A through which the protrusion 53 of the nut member main body 16A is inserted is formed in the bottom portion 55 of the damper 16C.

The protrusion 53 of the nut member main body 16A can contact the inner surface of the upright wall 16B2 of the bracket 16B through the hole 55A.
The protrusion 53 is set so as not to contact the inner surface of the upright wall 16B2 of the bracket 16B when a load in the moving direction of the upper rail 14 is not applied to the nut member 16.

  According to such a configuration, the damper 16C can be elastically deformed in the moving direction of the upper rail 14 by being pushed by the nut member main body 16A while the protrusion 53 does not contact the inner surface of the upright wall 16B2 of the bracket 16B. When the protrusion 53 comes into contact with the inner surface of the upstanding wall 16B2 of the bracket 16B, further elastic deformation in the moving direction of the upper rail 14 of the damper 16C is prohibited. That is, a pair of protrusions 53 provided in the nut member main body 16A and extending in the moving direction of the upper rail 14, a hole 55A provided in the bottom portion 55 of the damper 16C through which the protrusion 53 of the nut member main body 16A is inserted, and the nut member A stopper mechanism 51 that restricts the amount of elastic deformation in the moving direction of the upper rail 14 of the damper 16C is formed with the inner surface of the upright wall 16B2 of the bracket 16B with which the protrusion 53 of the main body 16A can abut.

  Furthermore, in this embodiment, a pair of recessed part 61 was provided in the end surface by the side of the moving direction of the upper rail 14 of nut member main body 16A. And the convex part 63 engaged with the recessed part 61 was provided in the bottom part 55 which is the surface of the damper 16C facing the surface of the nut member main body 16A in which the recessed part 61 was provided.

In addition, an elastic convex portion 71 is formed on the top portion 57B of the cylindrical portion 57 of the damper 16C so as to press against the separation wall 16B3 of the bracket 16B.
According to such a configuration, the following effects can be obtained.

 (1) By providing the stopper mechanism 51 that restricts the amount of elastic deformation of the damper 16C in the moving direction of the upper rail 14, the amount of elastic deformation of the damper 16C can be limited, and permanent deformation of the damper 16C can be prevented. As a result, no play or abnormal noise occurs in the power seat track.

 (2) The stopper mechanism is provided in the nut member main body 16A, and is provided in the pair of protrusions 53 extending in the moving direction of the upper rail 14 and the bottom 55 of the damper 16C, and the hole through which the protrusion 53 of the nut member main body 16A is inserted. 55A and the inner surface of the upright wall 16B2 of the bracket 16B on which the protrusion 53 of the nut member main body 16A can come into contact, and when the protrusion 53 comes into contact with the surface of the bracket 16B, the protrusion 53 has a compression direction. The force acts mainly and no bending moment is generated. Therefore, the design of the protrusion 53 is easy.

(3) By changing the length of the protrusion 53, the allowable elastic deformation amount can be easily changed.
(4) In the bracket 16B of the present embodiment, the surface along the extending direction of the lower rail 12 to which the nut member 16 is fixed is an open surface.

  However, in the present embodiment, the pair of recesses 61 is provided on the end surface of the nut member main body 16A on the moving direction side of the upper rail 14. And the convex part 63 engaged with the recessed part 61 was provided in the bottom part 55 which is the surface of the damper 16C facing the surface of the nut member main body 16A in which the recessed part 61 was provided. Therefore, it is possible to prevent the damper 16C from being elastically deformed and escaping to the open surface of the bracket 16B.

(5) Since the elastic convex portion 71 that presses against the separation wall 16B3 of the bracket 16B is formed on the top portion 57B of the cylindrical portion 57 of the damper 16C, the assembly of the damper 16C becomes easy.
In addition, this invention is not limited to the said embodiment.

Although the protrusion of the stopper mechanism of the above embodiment is provided on the nut member main body 16A, it may be provided on the inner surface of the standing wall 16B2 of the bracket 16B.
Furthermore, although the protrusion of the nut member main body 16A of the above embodiment extends in the moving direction of the upper rail 14, it may extend in a direction intersecting with the moving direction of the upper rail 14. As an example, there is a configuration in which a protrusion is provided on a surface along the moving direction of the upper rail 14 and a long hole is provided in the bracket 16B to fit the protrusion.

Further, the elastic convex portion 71 of the damper 16C may be provided on the bottom portion 57A of the cylindrical portion 57 of the damper 16C.
Further, the bracket 16B in the above embodiment is a monolithic rectangle in a side view, but as shown in FIG. 8, it is bent from the base part 81A and the base part 81A attached to the lower rail (nut member support rail) 13. Two brackets 81 that are L-shaped in a side view and that include the standing wall 81B facing the damper 16C may be used. The pair of upright walls 81B functions to prohibit movement of the upper rail 14 of the nut member main body 16A in the moving direction.

  According to such a configuration, even when the dimensions of the nut member main body 16A and the damper 16C are changed, it can be dealt with only by changing the position of the fixing screw insertion hole 13B of the lower rail (nut member support rail) 13.

16 Nut member 16A Nut member body 16B Bracket 16C Damper 16D Female thread hole 20 Screw rod

Claims (5)

A lower rail disposed on the vehicle floor;
An upper rail that is movably engaged with the lower rail and disposed on the seat side;
A threaded rod which is supported lifting to one of the rails between the upper rail and the lower rail,
A nut member screwed to the screw rod and fixed to the other rail of the upper rail and the lower rail;
With
The nut member is
A bracket fixed to the other rail;
The bracket restricts movement of the upper rail in the moving direction, and a nut member main body having a female screw hole into which the screw rod is screwed,
In a power seat track comprising an elastic damper disposed between the inner surface of the bracket and the outer surface of the nut member body,
A stopper mechanism for restricting the amount of elastic deformation of the damper in the upper rail movement direction is provided ,
The stopper mechanism is
A protrusion extending in the moving direction of the upper rail, provided on one of the end surface of the nut member main body on the moving direction side of the upper rail and the surface of the bracket facing the nut member main body;
A through hole provided in the damper and through which the protrusion is inserted;
An end surface on the moving direction side of the upper rail of the nut member main body with which the protrusion can abut through the through hole, the other surface of the surface of the bracket facing the nut member main body,
Consists of
When the load in the movement direction of the upper rail is not applied to the nut member, the protrusion has an end surface on the movement direction side of the upper rail of the nut member main body, a surface of the bracket facing the nut member main body, A power seat track, wherein the power seat track is set so as not to contact the other surface . A lower rail disposed on the vehicle floor;
An upper rail that is movably engaged with the lower rail and disposed on the seat side;
A screw rod supported by one of the upper rail and the lower rail;
A nut member screwed to the screw rod and fixed to the other rail of the upper rail and the lower rail;
With
The nut member is
A bracket fixed to the other rail;
The bracket restricts movement of the upper rail in the moving direction, and a nut member main body having a female screw hole into which the screw rod is screwed,
In a power seat track comprising an elastic damper disposed between the inner surface of the bracket and the outer surface of the nut member body,
A stopper mechanism for restricting the amount of elastic deformation of the damper in the upper rail movement direction is provided,
The stopper mechanism is
A protrusion extending in the moving direction of the upper rail, provided on one of the end surface of the nut member main body on the moving direction side of the upper rail and the surface of the bracket facing the nut member main body;
A bottomed hole provided in the damper and into which the protrusion can be inserted;
An end surface of the nut member main body that can be pressed through the bottom of the bottomed hole on the moving direction side of the upper rail, the other surface of the bracket facing the nut member main body,
Consists of
When the load in the movement direction of the upper rail is not applied to the nut member, the bottom of the projection and the bottomed hole is an end surface of the nut member body on the movement direction side of the upper rail, and the nut of the bracket features and to Rupa Lower seat track that the other surface of the member body and the facing surfaces are set so as not to press. The screw rod is rotatably supported,
3. The power seat track according to claim 1 , wherein the protrusion is provided on an end surface of the nut member main body on the moving direction side of the upper rail . The protrusion of the stopper mechanism is provided on an end surface of the nut member main body on the moving direction side of the upper rail,
The bracket has an open surface on a side surface along the moving direction of the upper rail,
A recess is provided on the end surface of the nut member main body on the moving direction side of the upper rail,
4. The power seat track according to claim 3 , wherein a convex portion that engages with the concave portion is provided on a surface of the damper that faces the surface of the nut member main body provided with the concave portion. The bracket is
A clamping wall that is clamped between the nut member body and the rail to which the nut member is fixed, and is fixed to the rail to which the nut member is fixed;
A pair of upstanding walls that stand up from both ends in the extension direction of the rail to which the nut member of the sandwiching wall is fixed;
Connecting the pair of upstanding walls, and comprising a separating partition facing the sandwiching wall,
The damper is
A bottom portion in contact with an end surface of the nut member body on the moving direction side of the upper rail, and in contact with an inner surface of the bracket;
Bent from the periphery of the bottom, and a bottomed cylindrical shape comprising a cylindrical portion covering the surface of the nut member main body along the moving direction of the upper rail,
The power seat track according to any one of claims 1 to 4, wherein the cylindrical portion is provided with an elastic convex portion that presses against at least one of the sandwiching wall and the separation wall of the bracket.

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