JP2010006123A - Power slide device for vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power slide device for a vehicle seat including a screw rod freely rotatably supported by a screw rod support rail, and a nut member screwed with the screw rod and fixed to a nut member fixing rail, the nut member including a cover member made of a metal and a nut body member made of a synthetic resin, to obtain the power slide device having a high tolerance to an impact load by the metal cover member increasing a slip tolerance load of the screw rod and the feed nut. <P>SOLUTION: In the power slide device for the vehicle seat, the cover member is provided with a pinched wall pinched between a nut body member and a nut member support rail and fixed to the nut member support rail, a pair of standing walls standing from both end parts of the pinched wall in an extending direction of the nut member support rail, and a partition wall connecting the pair of standing walls and opposing to the pinched wall. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power slide device that moves a vehicle seat in the front-rear direction by a motor-driven feed screw mechanism.

  The vehicle seat slide device has a basic structure in which an upper rail fixed to a seat is slidably engaged with a lower rail fixed to a vehicle floor surface in the front-rear direction. In this vehicle seat slide device, a motor-driven screw rod is rotatably supported on one of an upper rail and a lower rail in an extending direction of the rail, and the other is screwed into a nut screwing portion of the screw rod. Power is achieved by fixing the nut member.

It has been proposed and put into practical use that at least the female thread portion is made of a synthetic resin material in order to prevent the nut member from generating abnormal noise due to relative screwing rotation with the long screw rod. In addition, in order to supplement the strength of the nut body member made of a synthetic resin material, it has been proposed to cover the outer periphery of the nut body member with a metal cover member. In the conventional product, this metal cover member is formed in a hat shape (patent document 1).
JP 2006-175953 A

  In a power slide device, when a collision load is applied to the vehicle, an axial pull-out load (peeling load) is applied between the screw rod and the feed nut (in the aspect of supporting the screw rod on the upper rail, the shaft is connected to the screw rod). Directional force is applied, and force to pull out from the feed nut fixed to the lower rail is applied). In a nut member hybridized with a synthetic material of a synthetic resin material and a metal material, the meshing portion with the screw rod is a soft synthetic resin material. Therefore, the meshing portion is deformed, and the screw rod and the feeding member can be easily moved in the axial direction. There was a risk of relative movement. In the conventional hybrid nut member, the metal cover member does not contribute to the increase of the above-described detachment load, or the degree of contribution is low.

  The present invention is a power slide device for a vehicle seat in which a nut member is hybridized based on the above awareness of the problem. A power cover that is strong against a collision load by using a metal cover member to increase the removal load of the screw rod and the feed nut. The object is to obtain a device.

  The present invention relates to a hybrid type feed nut composed of a metal cover member and a synthetic resin nut body member, and a direction in which the nut body member is crushed in the direction perpendicular to the axis due to deformation generated in the metal cover member by a collision load. This is based on the viewpoint that the removal load can be increased by applying the above force.

  The present invention relates to a lower rail disposed on a vehicle floor surface; an upper rail slidably engaged with the lower rail and disposed on a seat side; rotatably supported by one of the upper rail and the lower rail and driven to rotate. And a nut member screwed to the screw rod and fixed to the other of the upper rail and the lower rail. The nut member includes a metal cover member and the metal member. A synthetic resin nut body member located in the cover member, and the cover member is sandwiched between the nut body member and the nut member support rail and is fixed to the nut support rail. A wall, a pair of upright walls rising from both ends in the extending direction of the nut member support rail of the sandwiching wall, and the sandwiching wall connecting the pair of standing walls It is characterized in that it consists of a series of metallic material having a wall facing away walls.

  The cover member and the nut main body member can be fixed to the nut support rail with, for example, a fixing screw inserted and screwed into the clamping wall and the nut main body member from the nut member support rail.

  The pair of upright walls can be upright wall surfaces which are most generally parallel to each other and orthogonal to the sandwiching wall. Or it can also be set as the mutually parallel inclination wall surface inclined with respect to the surface orthogonal to a pinching wall.

  The clamping wall can be divided at the center in the extending direction of the feed nut support rail, and fixing screw insertion holes can be formed on both sides of the divided part.

  It is preferable to sandwich a vibration absorbing member made of an elastic material between the metal cover member and the synthetic resin nut main body member.

  The present invention relates to a vehicle seat power slide device in which a seat is moved back and forth through a feed nut by a rotational movement of a screw rod, and the feed nut is made of a metal cover member and a synthetic resin located in the cover member. The feed nut body member, and the cover member is provided with a sandwiching wall sandwiched between the nut body member and the nut member support rail, and a separation wall facing the sandwiching wall, Since the nut body member is supported between the two walls, when a collision load is applied, the gap between the sandwiching wall and the separation wall is narrowed with the deformation of the pair of standing walls (the angle of the connecting portion). Thus, a force in the screw rod radial direction acts on the nut body member. For this reason, the removal load (peeling load) between the nut body member and the screw rod can be increased, and a power slide device that is strong against a collision load can be obtained.

  As illustrated in FIG. 8, the vehicle seat slide device includes a pair of left and right seat tracks 10 that are positioned between the vehicle seat S and the floor surface F and extend in the vehicle front-rear direction. The left and right seat tracks 10 have the same (symmetric) structure, and have a lower rail 13 fixed to the floor F with front and rear brackets 11 and 12 and an upper rail 14 fixed to the seat S. The upper rail 14 is slidably fitted.

  As shown in FIG. 1, a nut member 16 whose axis is directed in the front-rear direction is fixed to the lower rail 13 via a fixing bolt 15. As shown in FIGS. 1 and 4, the nut member 16 includes a nut main body member (threaded member) 16A made of a synthetic resin (for example, PA) in the center and a metal (for example, a member surrounding the nut main body member 16A). It is composed of a cover member 16B made of (iron-based material), and a rubber vibration absorbing member (vibration absorbing sheet) 16C is interposed between the nut main body member 16A and the cover member 16B in a compressed state.

  The nut body member 16A has a rectangular shape as a whole, and a female screw 16D is formed at the center thereof. The cover member 16B has a rectangular shape in side view that surrounds the entire nut body member 16A. That is, the nut body member 16A includes a lower rail (nut member support rail) 13 and a sandwiching wall 16B1 sandwiched between the cover member 16B, and the front-rear direction of the sandwiching wall 16B1 (extending direction of the lower rail 13). It consists of a pair of upright walls 16B2 that stand up from both ends, and a separation wall 16B3 that connects the upper ends of the upright 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 16B2. The clamping wall 16B1 is divided at the central portion (the cover member 16B is formed by bending a plate material, and the divided portions are present in the cover member 16B), and fixed screws are inserted on both sides of the divided portion. A hole 16B4 is formed. A through hole 16B5 through which the screw rod 20 is inserted is formed in the pair of standing walls 16B2.

  The lower rail 13 is provided with a pair of fixing screw insertion holes 13a corresponding to the pair of fixing screw insertion holes 16B4. The nut body member 16A has a pair of fixing screw insertion holes 16B4 and a fixing screw insertion hole 13a. 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 13a 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 lower rail 13.

  On the upper rail 14, a screw rod 20 that is screwed into the female thread 16D of the nut member 16 is rotatably supported. That is, the upper rail 14 is provided with a gear box 30 and a bearing member 17 that rotatably support the front end and the rear end of the screw rod 20 at the front end and the rear end thereof. From the front end portion, the serration portion 21, the screwless portion 22, the crush nut screwing portion 23, the screwless portion 24, the main nut screwing portion 25 screwed into the female screw 16 </ b> D of the nut member 16, and the bearing member 17 are rotated. A screwless portion (rear end bearing portion) 26 that is freely supported 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 engaged with the serration portion 21 so as not to rotate relative to the shaft portion is rotatably supported. The worm wheel 32 is meshed 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) is in the normal direction. Reversely rotate.

  The worms 33 in the gear box 30 of the left and right upper rails 14 are rotated by an interlocking mechanism, and the screw rods 20 of the left and right upper rails 14 are 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. 1 shows a forward moving end of the upper rail 14 (seat S) with respect to the lower rail 13.

  A load transmission member 40 is fixed to the upper rail 14 so as to be rotatable relative to the screw rod 20 and move together with the screw rod 20 in the axial direction (restricted in the axial movement). As apparent from FIGS. 1 to 3, the load transmission member 40 includes an annular portion 41 having a screw insertion hole 41 a for inserting (slowing) the screw rod 20, and a bolt portion 42 for fixing to the upper rail 14. The annular portion 41 and the flange portion 43 between the bolt portions 42 are integrally provided. As shown in FIG. 1, the bolt portion 42 is inserted into a fastening hole 31 a formed in the connection bracket 31 of the gear box 30 and a fastening hole 14 a formed in the upper rail 14, and then a 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.

  Crash nuts 27 and 28 are caulked and fixed to the crush nut screwing portion 23 of the screw rod 20 so as to be positioned before and after the annular portion 41 of the load transmission member 40, and the load transmission member is formed by the crush nuts 27 and 28. The relative movement of the 40 screw rods 20 in the axial direction is restricted.

  In the seat slide device described above, when a collision load is applied, the upper rail 14 tends to move relative to the lower rail 13, and the load is transferred from the annular portion 41 of the load transmitting member 40 via the crash nut 27 or 28. To the screw rod 20. 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 (vehicle floor F), the nut member 16 screwed with the screw rod 20 is joined together with the screw rod 20. Try to move on. More specifically, the nut main body portion 18A of the nut member 16 pushes one of the pair of standing walls 16B2 of the cover member 16B, and as a result, the pair of standing walls 18B2 breaks the orthogonality with the sandwiching wall 16B1. Thus, the space between the separating partition wall 18B3 and the sandwiching wall 16B1 is narrowed (FIG. 5). In FIG. 5, the shape of the cover member 16B before deformation is indicated by a chain line. As described above, when the interval between the separation partition wall 18B3 and the sandwiching wall 16B1 is narrowed (when the cover member 16 that is rectangular in a side view is deformed into a rhombus), the nut body member 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.

  FIG. 6 shows another embodiment of the present invention. In this embodiment, the shape of the cover member 16B of the nut member 16 is a rhombus from the side as viewed from the beginning. Regarding the direction of the rhombus, the runaway to the front of the sheet S at the time of the front collision is considered to be more dangerous than the runaway to the rear of the sheet S at the time of the rear collision. Elastic deformation is performed in a direction approaching the wall 16B1. That is, in this embodiment, the pair of upright walls 16B2 are inclined by an angle α so that the upper side is forward with respect to the direction orthogonal to the sandwiching wall 16B1. If the angle α is set in advance in this way, it is easy to obtain a trigger for deformation. Further, as shown in FIG. 7, by forming the thin wall portion T in the bent corner portions of the upright wall 16B2, the sandwiching wall 16B1 and the separating partition wall 16B3 of the cover member 16B, the deformation of the cover member 16B at the time of the collision is easier. Can be.

  Incidentally, in the case of a metal cover member having a cross-sectional hat shape as in Patent Document 1, the above-described crushing effect of the nut body member 16A cannot be obtained. This is because the fixed wall with the nut support rail is located outside the nut main body member, so that when the force is applied to the standing wall through the nut main body portion by the collision load, the fixed wall is separated from the nut support rail. It is thought to receive the force of direction.

  In addition, the cover member 16B can also be formed in the box shape which does not have a parting part, for example by processing a pipe material.

  The above embodiment is an embodiment in which the bearing member 17 of the present invention is applied to a power slide device in which the screw rod 20 is rotatably supported on the upper rail 14 and the nut member 16 is fixed to the lower rail 13. The invention can be similarly applied to a power slide device in which the screw rod 20 is rotatably supported on the lower rail 13 and the nut member 16 is fixed to the upper rail 14.

It is a longitudinal cross-sectional view which shows one Embodiment of the power slide apparatus by this invention. It is sectional drawing which follows the II-II line of FIG. It is the perspective view which took out the structure around a screw rod from the power slide apparatus of FIG. It is a disassembled perspective view around a nut member. It is a longitudinal cross-sectional view which shows the example of a model of a deformation | transformation of the nut member at the time of the collision of the power slide apparatus by this invention. It is a longitudinal cross-sectional view around the nut member showing another embodiment of the power slide device according to the present invention. It is a side view of the principal part of a nut member which shows another embodiment of the power slide apparatus by this invention. 1 is a perspective view showing a general configuration of a vehicle seat slide device.

S Vehicle Seat F Floor 10 Seat Track 13 Lower Rail (Nut Member Support Rail)
14 Upper rail (screw rod support rail)
14a Fastening hole 15 Fixing bolt 16 Nut member 16A Nut body member 16B Cover member 16C Damping member 16B1 Nipping wall 16B2 Standing wall 16B3 Separating partition 16B4 Fixing screw insertion hole 16D Female screw 16F Fixed female screw hole 16G Fixing screw 17 Bearing member 20 Screw rod 21 Serration portion 22 24 Screwless portion 23 Crash nut screwing portion 25 Main nut screwing portion 26 Rear end bearing portion 27 28 Crash nut 30 Gear box 31 Connection bracket 31a Fastening hole 32 Worm wheel 32a Serration hole 33 Worm 40 Load transmission member 41 Annular part 41a Screw insertion hole 42 Bolt part 43 Flange part 44 Fixing nut

Claims (6)

A lower rail disposed on the vehicle floor;
An upper rail slidably engaged with the lower rail and disposed on the seat side;
A screw rod rotatably supported and driven by one of the upper rail and the lower rail; and a nut member screwed into the screw rod and fixed to the other of the upper rail and the lower rail;
In a vehicle seat power slide device comprising:
The nut member has a metal cover member and a synthetic resin nut body member located in the metal cover member,
The cover member is sandwiched between the nut body member and the nut member support rail, and is fixed to the nut support rail. From both ends of the sandwiching wall in the extending direction of the nut member support rail. A power slide device for a vehicle seat, comprising a series of metal materials having a pair of standing walls and a separation wall facing the sandwiching wall that connects the pair of standing walls. The power slide device for a vehicle seat according to claim 1, wherein the cover member and the nut body member are fixed to the nut support rail by a fixing screw inserted and screwed from the nut member support rail to the clamping wall and the nut body member. A power slide device for a fixed vehicle seat. The power sliding device for a vehicle seat according to claim 1 or 2, wherein the pair of upright walls are upright wall surfaces parallel to each other perpendicular to the sandwiching wall. 4. The vehicle seat power slide device according to claim 1, wherein the pair of upright walls are parallel inclined wall surfaces inclined with respect to a surface orthogonal to the sandwiching wall. 5. Power slide device. 5. The vehicle seat power slide device according to claim 1, wherein the clamping wall is divided at a central portion in a feed nut support rail extending direction, and fixed screws are provided on both sides of the divided portion, respectively. A power slide device for a vehicle seat in which an insertion hole is formed. The power sliding device for a vehicle seat according to any one of claims 1 to 5, wherein a vibration absorbing member made of an elastic material is sandwiched between the metal cover member and a synthetic resin nut body member. Power seat device for vehicle seats.

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