JP7129846B2 - seat slide device - Google Patents

Description

The technology disclosed in this specification relates to a seat slide device for sliding a seat of an automobile.

A seat slide device for sliding a seat includes a lower rail that can be attached to the vehicle body and an upper rail that can be attached to the lower portion of the seat. The upper rail is slidably engaged with the lower rail. Further, the seat slide device has a lock mechanism that fixes the upper rail to the lower rail (for example, Japanese Unexamined Patent Application Publication No. 2002-100003).

In the seat slide device of Patent Document 1, the sliding resistance of the upper rail to the lower rail differs between the first direction and the second direction along the rail longitudinal direction. Note that the first direction and the second direction are directions opposite to each other. Such a seat slide device can, for example, increase sliding resistance when sliding the seat forward of the vehicle and reduce sliding resistance when sliding the seat rearward of the vehicle. With such a configuration, the seat can be moved backward with a light force, and the speed of forward movement of the seat can be suppressed. Abrupt movement of the seat can be suppressed when moving the seat forward, and the occupant can comfortably move the seat without feeling uneasy.

In the seat slide device of Patent Document 1, a wedge member is sandwiched between the upper rail and the lower rail. The wedge member is supported by the upper rail so as to move back and forth along the rail longitudinal direction, and is sandwiched in a tapered posture along the rail longitudinal direction. Below, the gap in which the wedge member is sandwiched will be referred to as a wedge gap. When the upper rail moves in the tapering direction of the wedge member, the lower rail relatively moves from the thin side to the thick side of the wedge member. Then, the wedge member is pushed to the thick side, that is, in a direction to come out of the wedge gap due to the frictional resistance between the lower rail and the wedge member. As a result, the contact pressure between the wedge member and the lower rail is lowered, and the sliding resistance is lowered. Conversely, when the upper rail moves from the thin side to the thick side of the wedge member, the lower rail relatively moves from the thick side to the thin side of the wedge member. Then, the wedge member is pushed toward the thin side by the frictional resistance between the lower rail and the wedge member, that is, in the direction of pushing the wedge member into the wedge gap. As a result, the contact pressure between the wedge member and the lower rail increases and the sliding resistance increases. In the seat slide device of Patent Document 1, by sandwiching the wedge member between the upper rail and the lower rail, the sliding resistance in one direction and the sliding resistance in the opposite direction of the upper rail can be made different.

Japanese Patent Application Laid-Open No. 2018-2130

In the seat slide device of Patent Document 1, a wedge member is sandwiched between the upper rail and the lower rail. The wedge member is sandwiched between the upper plate of the lower rail and a predetermined portion of the upper rail located below the upper plate. On the other hand, the upper rail has rollers, and the lower surfaces of the rollers are in contact with the bottom plate of the lower rails. When the upper rail moves with respect to the lower rail, the rollers rotate to smoothly move the upper rail. The gap in which the wedge member is sandwiched, that is, the gap between the upper plate of the lower rail and the predetermined portion of the upper rail (the above-described wedge gap) varies according to the error in the mounting height of the rollers. That is, the wedge clearance varies when mass-produced. If the wedge gap varies, the contact pressure between the wedge member and the lower rail varies. As a result, the force required to move the sheet varies. This specification relates to a seat slide device having different sliding resistance in one direction and in the opposite direction, and provides a technique for reducing variations in sliding resistance when mass-produced.

A seat slide device disclosed in this specification includes a lower rail, an upper rail, rollers, and a wedge member. The lower rail is attachable to the vehicle body and has a bottom plate and an upper plate facing the bottom plate. The upper rail is attachable to the seat and slidably engaged with the lower rail. The roller is supported by the upper rail so as to be positioned between the bottom plate and the top plate, and the bottom surface is in contact with the bottom plate. The wedge member is supported by the upper rail so as to move back and forth along the longitudinal direction of the rail, and is sandwiched between the upper surface of the roller and the upper plate of the lower rail. The wedge member is arranged in a tapered posture along the rail longitudinal direction of the lower rail. A sliding piece may be used instead of the roller.

In the seat slide device of Patent Document 1, the wedge member is sandwiched between the lower rail and the upper rail. It is sandwiched between the upper plates of the lower rail. Therefore, it is not affected by errors in the mounting height of the roller (or sliding piece) with respect to the upper rail. Therefore, the seat slide device disclosed in the present specification has less variation in surface pressure acting on the contact surface between the wedge member and the lower rail when mass-produced, resulting in less variation in sliding resistance. Although there are various dimensional tolerances in mass production, the sheet slide device disclosed in this specification can at least eliminate the influence of mounting height errors of rollers (or sliding pieces).

The effect of the wedge member is the same as in Patent Document 1, and the sliding resistance against the lower rail when the upper rail moves in the tapering direction of the wedge member is is smaller than the sliding resistance against

The wedge member may be biased in a tapering direction. The biasing force keeps the wedge member in stable contact with the roller and the upper plate at all times, thereby suppressing changes in sliding resistance over time.

In the sheet slide device disclosed in this specification, the roller and the wedge member may be in direct contact, or a cushioning material may be sandwiched between the roller and the wedge member. By providing the cushioning material, the rotation of the roller is not directly transmitted to the wedge member, and the rotation of the roller does not affect the surface pressure acting on the contact surface between the wedge member and the upper rail. That is, by sandwiching the cushioning material, it is possible to prevent the sliding resistance from being affected by the rotation of the roller.

The cushioning material has a wedge shape, and is preferably arranged in a posture in which the tapering direction of the cushioning material is opposite to the tapering direction of the wedge member. In this case, when the wedge member is pushed to the thick side by the movement of the upper rail, the cushioning material in contact with the roller is dragged by the rotation of the roller and pushed in the direction opposite to the wedge member. That is, each of the wedge member and the cushioning material is pushed in a direction to be removed from the wedge gap, and the sliding resistance becomes smaller. When the wedge member is pushed to the narrow side by the movement of the upper rail, the wedge member and the cushioning material are pushed into the wedge gap, and the sliding resistance increases. That is, according to the above structure, it is possible to increase the difference between the sliding resistance when the upper rail moves in one direction and the sliding resistance when it moves in the opposite direction.

Details and further improvements of the technique disclosed in this specification are described in the following "Mode for Carrying Out the Invention".

1 is a side view of a seat slide device according to an embodiment; FIG. 1 is a perspective view of a seat slide device; FIG. 4 is a perspective view of an upper rail; FIG. FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2; FIG. 3 is a cross-sectional view taken along line VV of FIG. 2; FIG. 11 is a cross-sectional view passing through the roller axis of the seat slide device of the first modified example; FIG. 7 is a cross-sectional view along line VII-VII of FIG. 6; FIG. 11 is a cross-sectional view of a seat slide device of a second modification passing through the roller axis; FIG. 9 is a cross-sectional view along line IX-IX of FIG. 8; FIG. 11 is a cross-sectional view of a seat slide device of a third modified example; FIG. 11 is a cross-sectional view of a seat slide device of a fourth modified example;

A seat slide device 2 according to an embodiment will be described with reference to the drawings. FIG. 1 shows a side view of a seat slide device 2 attached to an automobile. The seat slide device 2 is composed of lower rails 10 and upper rails 20 . The upper rail 20 is slidably attached to the lower rail 10 . The lower rail 10 is fixed to the floor panel 99 of the vehicle. The upper rail 20 is attached to the lower portion of the seat cushion 91 of the seat 90 .

An operation lever 39 interlocked with a lock lever (described later) extends forward beyond the front end of the upper rail 20 . When the user lifts the operation lever 39, the lock of the upper rail 20 with respect to the lower rail 10 is released, and the upper rail 20 becomes slidable. That is, the seat 90 becomes slidable. The X direction of the coordinate system in the drawing corresponds to the rail longitudinal direction of the lower rail 10 and the upper rail 20 . The Y direction corresponds to the lateral direction of the rail. The +Z direction of the coordinate system in the drawing indicates upward. For convenience of explanation, the +X direction is called "forward" and the -X direction is called "backward." The meaning of each axis of the coordinate system is the same in the following figures.

2 shows a perspective view of the seat slide device 2, and FIG. 3 shows a perspective view of the upper rail 20. As shown in FIG. First, the structure of the lower rail 10 will be described with reference to FIG. The lower rail 10 is formed from a single metal plate by bending (roll forming, press working, or the like). The lower rail 10 includes a bottom plate portion 11 attached to the vehicle body, a pair of outer vertical plate portions 12 , a pair of upper plate portions 13 and a pair of inner vertical plate portions 14 . The pair of outer vertical plate portions 12 extends upward from both ends of the bottom plate portion 11 in the rail width direction (the Y direction in the drawing). The pair of upper plate portions 13 laterally extends from the upper end of each outer vertical plate portion 12 toward the center in the rail width direction. The pair of inner vertical plate portions 14 extend downward from the inner ends of the respective upper plate portions 13 . The pair of inner vertical plate portions 14 are opposed to each other. The outer vertical plate portion 12 and the inner vertical plate portion 14 are substantially parallel. The inner vertical plate portion 14 is provided with lock holes 15 arranged along the rail longitudinal direction (X direction).

The structure of the upper rail 20 will be described with reference to FIG. The upper rail 20 has a pair of main plate portions 21 , a pair of lower plate portions 22 and a pair of arm plate portions 23 . The pair of main plate portions 21 extend in the vertical direction, and their upper and lower portions are open in directions away from each other. Below the pair of main plate portions 21, a lower plate portion 22 extends outward in the rail width direction from the lower end of each main plate portion 21. As shown in FIG. An arm plate portion 23 extends upward from the outer end of each lower plate portion 22 . When the upper rail 20 is assembled to the lower rail 10 , the arm plate portion 23 is positioned between the outer vertical plate portion 12 and the inner vertical plate portion 14 of the lower rail 10 . A roller 24 is rotatably supported on the arm plate portion 23 . The lower surface of the roller 24 (the lower surface of the peripheral surface) is in contact with the bottom plate portion 11 of the lower rail 10, and when the upper rail 20 moves relative to the lower rail 10, the roller 24 rotates, thereby causing the upper rail 20 to move. move smoothly.

A plurality of lock claws 27 protrude from one arm plate portion 23 substantially at the center in the rail longitudinal direction. The lock claw 27 moves in conjunction with the lock lever 29. - 特許庁Although detailed description of the mechanism is omitted, the lock lever 29 is also interlocked with the operation lever 39 (see FIG. 1), and when the user raises the operation lever 39, the lock lever 29 is lowered. The lock claw 27 retreats from the arm plate portion 23 in conjunction with the lowering of the lock lever 29. - 特許庁The lock claw 27 retreats to a space sandwiched between the pair of main plate portions 21 . The lock lever 29 is biased by a spring (not shown). When the user releases the force applied to the operation lever 39 , the lock lever 29 returns to its original position due to the biasing force, and the lock claw 27 engages the arm plate portion 23 . advance to the outside. At this time, the lock claw 27 passes through the lock hole 15 provided in the inner vertical plate portion 14 of the lower rail 10 located between the main plate portion 21 and the arm plate portion 23 . When the lock claw 27 passes through the lock hole 15, the upper rail 20 is locked with respect to the lower rail 10. - 特許庁When the lock claw 27 retreats and disengages from the lock hole 15 , the lock is released and the upper rail 20 becomes slidable with respect to the lower rail 10 .

The upper rail 20 has a wedge member 32 . The wedge member 32 is sandwiched between the roller 24 and the upper plate portion 13 of the lower rail 10 to adjust the sliding resistance of the upper rail 20 with respect to the lower rail 10 . The rollers 24 are arranged on both sides of the upper rail 20 in the rail width direction, and a wedge member 32 is arranged for each roller 24 . Wedge members on both sides in the rail width direction are connected by connecting beams 31 . The connecting beam 31 is urged in the tapering direction of the wedge member 32 (-X direction of the coordinate system in the figure) by a spring (not shown). That is, the wedge member 32 is biased in its tapering direction.

A mechanism by which the wedge member 32 affects the sliding resistance will be described. 4 shows a cross-sectional view along line IV-IV in FIG. 2, and FIG. 5 shows a cross-sectional view along line VV in FIG. FIG. 4 shows a section through the axis of the front roller 24 . FIG. 5 is also a cross-section taken along line VV of FIG. 4 and shows a cross-section passing through the bottom plate portion 11, the top plate portion 13 and the rollers 24 of the lower rail 10. As shown in FIG. FIG. 5 corresponds to a cross section along line VV in FIG. In FIG. 5, illustration of the connecting beam 31 (see FIG. 3) that supports the wedge member 32 is omitted. In FIGS. 7 and 9-11, the illustration of the connecting beam 31 is similarly omitted. Also, in the following, it is assumed that the upper rail 20 is unlocked.

The wedge member 32 is supported by the upper rail 20 in a tapered posture along the rail longitudinal direction. In other words, the wedge member 32 is supported in a wedge-shaped posture when viewed from the rail width direction (the Y direction in the drawing).

The upper surface 32 a of the wedge member 32 is horizontal and contacts the lower surface of the upper plate portion 13 of the lower rail 10 . there is As previously mentioned, wedge member 32 is biased in a tapering direction. Due to this biasing force, the upper surface 32a of the wedge member 32 is always in contact with the upper plate portion 13, and the lower surface 32b is always in contact with the roller 24. As shown in FIG. In addition, the lower surface of the roller 24 is in contact with the bottom plate portion 11 of the lower rail 10 . The upper surface (lower surface) of the roller 24 means a surface positioned upward (lower) in the peripheral surface of the roller 24 .

When the upper rail 20 moves in the direction of arrow M in FIG. 5 (+X direction in the drawing), the lower rail 10 relatively moves rearward with respect to the upper rail 20 (-X direction in the drawing). The upper plate portion 13 of the lower rail 10 moves relatively rearward while contacting the upper surface 32a of the wedge member 32 . As understood from FIG. 5, the wedge member 32 is pushed rearward (-X direction in the figure) by the frictional force F between it and the upper plate portion 13. As shown in FIG. That is, the wedge member 32 receives a load in the direction of being pushed into the gap between the upper plate portion 13 and the roller 24 . As described above, the wedge member 32 is biased in the tapering direction (rearward in the case of the embodiment) by the spring. The contact surface pressure P between the plate portions 13 increases. As the contact surface pressure P increases, the sliding resistance of the upper rail 20 against the lower rail 10 increases.

Conversely, when the upper rail 20 moves rearward (-X direction in the drawing), the lower rail 10 relatively moves forward (+X direction in the drawing) with respect to the upper rail 20 . The upper plate portion 13 of the lower rail 10 moves in the +X direction in the drawing, and loads the wedge member 32 in the +X direction due to frictional force. The wedge member 32 receives a load in a direction away from the gap between the upper plate portion 13 and the roller 24 . This load cancels part of the urging force of the spring, the contact surface pressure P between the wedge member 32 and the upper plate portion 13 is reduced, and the sliding resistance of the upper rail 20 with respect to the lower rail 10 is reduced.

As described above, depending on the wedge member 32, the sliding resistance when moving the upper rail 20 forward and the sliding resistance when moving backward are different. The relationship between the moving direction of the upper rail 20 and the sliding resistance is as follows. The sliding resistance of the lower rail 10 when the upper rail 20 moves in the tapering direction (−X direction) of the wedge member 32 is greater than the sliding resistance of the lower rail 10 when moving in the direction opposite to the tapering direction (+X direction). become smaller.

As shown in FIGS. 4 and 5, the roller 24 and the wedge member 32 are sandwiched between the bottom plate portion 11 and the top plate portion 13 of the lower rail 10 . Even if the mounting height of the roller 24 on the upper rail 20 varies during mass production, the variation does not affect the contact surface pressure P between the wedge member 32 and the upper plate portion 13, that is, the sliding resistance.

(First Modification) A seat slide device 2a of a first modification will be described with reference to FIGS. FIG. 6 shows a cross section through the axis of the roller 24 of the sheet slide device 2a. FIG. 7 shows a cross section along line VII--VII in FIG. The seat slide device 2a differs from the seat slide device 2 of the embodiment in that a cushioning material 25 is attached to the upper rail 20. As shown in FIG. Since other structures are the same as those of the seat slide device 2 of the embodiment, the description is omitted. In FIGS. 6 and 7, the cushioning material 25 is grayed out to aid understanding.

The cushioning material 25 is attached to the side surface of the arm plate portion 23 of the upper rail 20 . The cushioning material 25 is attached to the arm plate portion 23 so as to be positioned between the roller 24 and the wedge member 32 . The cushioning material 25 is provided to prevent the wedge member 32 from being affected by the rotation of the roller 24 . The cushioning material 25 is made of a material softer than metal, such as resin or rubber. When the wedge member 32 moves rightward in FIG. 7 , pressure is applied to the roller 24 via the cushioning material 25 .

First, the effect of the rotation of the roller 24 on the wedge member 32 in the case of the sheet slide device 2 of the embodiment described above will be described. As described with reference to FIG. 5, the upper plate portion 13 of the upper rail 20 is in contact with the upper surface 32a of the wedge member 32, and when the upper rail 20 moves in the direction of the arrow M, contact with the upper plate portion 13 causes The frictional force F acts to push the wedge member 32 in the tapering direction (-X direction in the figure). On the other hand, when the upper rail 20 moves in the arrow M direction, the roller 24 rotates in the arrow R direction. Since the roller 24 is in contact with the lower surface 32b of the wedge member 32, its rotation acts to push the wedge member 32 in the direction from the thin side to the thick side (+X direction in the figure). That is, the rotation of the roller 24 acts to reduce the frictional force F exerted by the upper plate portion 13 on the wedge member 32 . Since the rotation of the roller 24 acts to reduce the force (friction force F) in the direction of pushing the wedge member 32 between the roller 24 and the upper plate portion 13, the contact surface pressure P acting on the upper surface 32a of the wedge member 32 goes down. Therefore, the rotation of the roller 24 acts in a direction to reduce the sliding resistance when the upper rail 20 moves in the +X direction. For the same reason, the rotation of the roller 24 acts to increase the sliding resistance when the upper rail 20 moves in the -X direction. That is, the rotation of the roller 24 acts to reduce the difference between the sliding resistance when the upper rail 20 moves in the +X direction and the sliding resistance when it moves in the -X direction.

On the other hand, in the case of the sheet slide device 2a shown in FIGS. 6 and 7, the roller 24 is in contact with the cushioning material 25 and is not in contact with the wedge member 32, so the wedge member 32 is not affected by the rotation of the roller 24. . As a result, compared with the seat slide device 2 of the embodiment, the seat slide device 2a of the first modified example has greater sliding resistance when the upper rails 20 move in the +X direction, and when the upper rails 20 move in the -X direction. sliding resistance becomes smaller. Compared to the seat slide device 2 of the embodiment, the seat slide device 2a of the first modification has a difference in sliding resistance when the upper rail 20 moves in the +X direction and in sliding resistance when it moves in the -X direction. becomes larger.

(Second Modification) Next, a seat slide device 2b of a second modification will be described with reference to FIGS. FIG. 8 shows a cross section through the axis of the roller 24 of the sheet slide device 2b. FIG. 9 shows a cross section along line IX-IX in FIG. The seat slide device 2b has cushioning materials 26 attached to the upper rails 20 in the same manner as the seat slide device 2a of the first modified example. However, the cushioning material 26 differs from the seat slide device 2a of the first modified example in that it has a wedge shape. Since the rest of the structure is the same as the seat slide device 2a, the description is omitted. In FIGS. 8 and 9, the cushioning material 26 is grayed out to aid understanding.

The cushioning material 26 is attached to the arm plate portion 23 of the upper rail 20 in such a posture that the tapered direction of the wedge shape faces the longitudinal direction of the rail. The cushioning material 26 is attached in a posture in which the tapering direction of the wedge faces opposite to the tapering direction of the wedge member 32 . In the example of FIG. 9, the wedge member 32 tapers in the -X direction, while the cushioning material 26 tapers in the +X direction. The upper surface 26 a of the cushioning material 26 is in surface contact with the lower surface 32 b of the wedge member 32 .

As described above, when the upper rail 20 moves in the direction of the arrow M, the frictional force F1 acts on the upper surface 32a of the wedge member 32 from the upper plate portion 13 in the -X direction. On the other hand, roller 24 rotates in the direction of arrow R. Due to this rotation, a frictional force F2 acts on the cushioning material 26 that is in contact with the upper surface of the roller 24 . The frictional force F2 is opposite to the frictional force F1. The friction force F1 acts to push the wedge member 32 between the upper plate portion 13 and the roller 24, and the friction force F2 acts to push the cushioning material 26 between the upper plate portion 13 and the roller 24. The contact surface pressure P between the wedge member 32 and the upper plate portion 13 is further increased by the frictional force F2 acting on the cushioning material 26 . That is, the sliding resistance increases when the upper rail 20 moves in the +X direction. For the same reason, the sliding resistance is further reduced when the upper rail 20 moves in the -X direction. The difference in sliding resistance of the seat slide device 2b of the second modification is even greater than that of the seat slide device 2a of the first modification.

(Third Modification) A seat slide device 2c of a third modification will be described with reference to FIG. FIG. 8 shows a cross section of the seat slide device 2c. The section in FIG. 10 corresponds to the section in FIG. The seat slide device 2c has a cushioning material 126 having a tapered shape. In order to facilitate understanding in FIG. 10 as well, the cushioning material 126 is filled with gray. As with the cushioning material 26 of the seat slide device 2b of the second modification, the cushioning material 126 is attached in a posture in which the tapering direction is opposite to the tapering direction of the wedge member 32, and the upper surface 126a of the cushioning material 126 faces the wedge member. 32 is in surface contact with the lower surface 32b. Furthermore, the lower surface 126b of the cushioning material 126 is provided with a recess having a radius of curvature that is the same as the radius of the cylinder of the roller 24. As shown in FIG. The lower surface 126b of the cushioning material 126 is in surface contact with the roller 24 at its depression. Since the lower surface 126b of the cushioning material 126 is in surface contact with the roller 24, the frictional force received from the roller 24 is increased. The difference in sliding resistance of the seat slide device 2c of the third modification is even greater than that of the seat slide device 2b of the second modification.

(Fourth Modification) A seat slide device 2d of a fourth modification will be described with reference to FIG. FIG. 11 shows a cross section of the seat slide device 2d. The section in FIG. 11 corresponds to the section in FIG. The seat slide device 2d differs from the seat slide device 2 in that it has a sliding piece 124 instead of the roller 24 of the seat slide device 2. As shown in FIG. Other structures are the same as those of the seat slide device 2 . The lower surface 124b of the sliding piece 124 is in surface contact with the bottom plate portion 11 of the lower rail 10, and the upper surface 124a is in surface contact with the lower surface 32b of the wedge member 32. As shown in FIG. The upper surface 32 a of the wedge member 32 is in surface contact with the upper plate portion 13 of the lower rail 10 . When the upper rail 20 moves relative to the lower rail 10 , the lower surface 124 b of the sliding piece 124 slides on the bottom plate portion 11 . A seat slide device 2d having sliding pieces 124 in place of the rollers 24 also has the same effects as the seat slide device 2 of the embodiment.

As described above, the seat slide device 2 of the embodiment and the seat slide devices 2a to 2d of the modified examples have a sliding resistance when the upper rail moves in one direction and a sliding resistance when moving in the opposite direction. Different resistance. And, when they are mass-produced, variations in the respective sliding resistances are small.

The wedge member 32 is biased in a tapering direction. A member that applies a biasing force to the wedge member 32 may be a coil spring, a plate spring, highly elastic rubber or highly elastic resin, or any other elastic member.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or in the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims as of the filing. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

2, 2a, 2b, 2c, 2d: seat slide device 10: lower rail 11: bottom plate portion 12: outer vertical plate portion 13: upper plate portion 14: inner vertical plate portion 15: lock hole 20: upper rail 21: main plate portion 22: Lower plate portion 23: Arm plate portion 24: Rollers 25, 26, 126: Cushioning material 27: Lock claw 29: Lock lever 31: Connecting beam 32: Wedge member 39: Operation lever 124: Sliding piece

Claims (4)

a lower rail attachable to the vehicle body and comprising a bottom plate and an upper plate facing the bottom plate;
an upper rail attachable to the seat and slidably engaged with the lower rail;
a roller or sliding piece supported by the upper rail so as to be positioned between the bottom plate and the top plate, the bottom surface of which is in contact with the bottom plate;
A wedge member sandwiched between the roller or the sliding piece and the upper plate, supported by the upper rail so as to advance and retreat in the longitudinal direction of the lower rail, and tapered along the longitudinal direction of the rail. a wedge member arranged in a shaped posture;
and
The seat slide device , wherein the wedge member is biased in a tapering direction . a lower rail attachable to the vehicle body and comprising a bottom plate and an upper plate facing the bottom plate;
an upper rail attachable to the seat and slidably engaged with the lower rail;
a roller or sliding piece supported by the upper rail so as to be positioned between the bottom plate and the top plate, the bottom surface of which is in contact with the bottom plate;
A wedge member sandwiched between the roller or the sliding piece and the upper plate, supported by the upper rail so as to advance and retreat in the longitudinal direction of the lower rail, and tapered along the longitudinal direction of the rail. a wedge member arranged in a shaped posture;
and
A sheet slide device, wherein a cushioning material is sandwiched between the roller and the wedge member. 3. The seat slide device according to claim 2 , wherein the cushioning material has a wedge shape and is arranged in a posture such that the tapering direction of the wedge shape is opposite to the tapering direction of the wedge member. 4. A sliding resistance against said lower rail when said upper rail moves in the tapering direction of said wedge member is smaller than a sliding resistance against said lower rail when moving in a direction opposite to said tapering direction. The seat slide device according to any one of 1.

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