JP2009241697A - Electrically operated seat slide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components for determining a moving stroke of a nut. <P>SOLUTION: This electrically operated seat slide device is provided with: a nut holding member 11 having a connecting part 11a connected to the inside of a lower rail 1 and a pair of holding parts 11b which are erected in a vehicle body longitudinal position of the connecting part 11a and on each of which a first insertion hole 11c for inserting a screw shaft 3 therein is formed; and an elastic body 12 provided with a recessed part 12b for fitting a nut 7 on an upper surface of the elastic body 12 formed into a substantially rectangular parallelepiped and formed with a second insertion hole 12a for inserting the screw shaft 3 therein, and provided with fitting spaces 12c for fitting the holding parts 11b from a lower side on both sides in a direction along the second insertion hole 12a of the recessed part 12b. The nut 7 is fitted into the recessed part 12b of the elastic body 12, and the holding parts 11b are fitted into the fitting spaces 12c from a lower side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seat slide device that slides a seat back and forth with a motor, and in particular, an improved joint between a screw shaft and a nut.

  The seat slide device includes a manual seat slide device that manually moves the seat in the front-rear direction and an electric seat slide device that moves the seat in the front-rear direction by the rotational force of a motor.

  As a conventional electric seat slide device, for example, the one described in Patent Document 1 is known. The basic structure of the electric seat slide device is that an upper rail that couples a seat is arranged inside a lower rail fixed to the vehicle body, a screw shaft is rotatably supported inside the upper rail, and the screw shaft located on the left and right of the seat A motor that rotates in synchronization with each other is provided on the upper rail, and nut members coupled to the lower rail are screw-coupled to the left and right screw shafts, respectively. A stopper for stopping the relative movement of the nut member is coupled to both ends of the screw shaft by caulking the screw shaft.

However, when the nut member collides with the stopper, the nut member collides with the rotating stopper, and a torsional force acts on the stopper from the nut member. Therefore, as disclosed in Patent Document 2, a seat slide device is disclosed in which a damper sandwiched between a damper pressing portion and a nut body side plate is provided on the nut member side of a stopper fixed to a lead screw. Yes. Although the nut member collides with the rotating nut body side plate, the nut body side plate rotates relative to the damper, so that a torsional force does not act on the damper.
JP-A-9-123807 JP-A-10-203209

  However, in addition to the stopper, the damper pressing portion, the nut body side plate, and the damper are provided on the lead screw, so that the number of parts increases and the number of parts increases, resulting in poor assembly. In addition, there is a great demand for miniaturization and weight reduction in the electric seat slide device, but in the structure where the lead screw is arranged in the upper rail, the nuts absorb the dimensional variation in the vertical and horizontal directions between the upper rail and the lower rail. The nut must be supported by the lower rail in a state surrounded by a damper so that the nut can be moved up and down, left and right, and a member for supporting the nut needs to be arranged inside the upper rail, so that the cross section of the upper rail is reduced. It was difficult.

  Accordingly, an object of the present invention is to provide an electric seat slide device that solves the above-described problems.

  According to a first aspect of the present invention, there is provided a lower rail having a substantially U-shaped cross section fixed to the vehicle body floor, an upper rail having a substantially inverted U-shaped cross section provided slidably on the lower rail, and an inner portion of the upper rail. A screw shaft disposed along the length direction of the upper rail, a nut screwed to the screw shaft, a nut holding member that holds the nut via an elastic body and is coupled to the inside of the lower rail; In the electric seat slide device comprising a motor provided on the upper rail side for rotationally driving the screw shaft and a pair of stroke setting members for setting the movement range of the nut, the nut holding member is disposed inside the lower rail. A first insertion having a coupled coupling part and a pair of holding parts erected at the vehicle body front-rear position of the coupling part, and the threaded shaft is inserted into each of the pair of holding parts The elastic body is an elastic block formed in a substantially rectangular parallelepiped, a second insertion hole is formed through the screw shaft in the length direction of the elastic body, and a recess is formed on the upper surface of the elastic body. A fitting space is formed on both sides of the concave portion along the second insertion hole, and the nut is fitted into the concave portion of the elastic body, and the holding portion is fitted into the fitting space from below. It is characterized by being.

  According to the present invention, the rotational force acts on the nut into which the screw shaft is screwed by the rotation of the screw shaft, but the rotation of the nut is restricted by the elastic body located on the side of the nut. In addition, a force that moves the nut in the axial direction by the rotation of the screw shaft acts, but since both sides of the nut in the axial direction are held by the holding portions via the elastic body, the nut holding member and the lower rail are simultaneously moved with the nut. Will move relatively, and as a result, the upper rail moves relative to the lower rail. Furthermore, since the screw shaft is only inserted into the first insertion hole of the holding portion and the second insertion hole of the elastic body, and the nut is movable up and down and left and right with respect to the nut holding member, Even if the lower rail moves relatively and the relative position of the nut holding member with respect to the screw shaft shifts, this shift is absorbed by the movement of the nut relative to the nut holding member in the vertical and horizontal directions.

  According to a second aspect of the present invention, in the electric seat slide device according to the first aspect, the side surfaces on both sides in the moving direction of the elastic body are close to the inner side surface of the upper rail.

  According to the present invention, when a large rotational force is applied to the nut, the elastic bodies on both sides of the nut are deformed, but the side surfaces of the elastic body are close to the inner side surface of the upper rail. Rotation is supplementarily regulated.

  According to a third aspect of the present invention, in the electric seat slide device according to the first or second aspect, the pair of stroke setting members are provided on the front and rear of the nut so as to be coupled to the inside of the upper rail perpendicular to the screw shaft. A third insertion hole is formed in the stroke setting member, and the screw shaft is inserted into the third insertion hole.

  According to this invention, the nut moves along the screw shaft, and the nut holding member and the elastic body that move together with the nut come into contact with the stroke setting member. Since the end of the elastic body is interposed between the stroke setting member and the nut holding member, there is a buffering action.

  According to a fourth aspect of the present invention, in the electric seat slide device according to any one of the first to third aspects, the elastic body is made of rubber and has a rubber hardness of A60 or more.

  According to the present invention, the elastic body is formed of rubber, and by setting the rubber hardness to A60 or higher, the hardness becomes appropriate, and when the rotational force acts on the nut, the portions located on both sides of the nut can be easily obtained. There is no deformation. Further, when the elastic body comes into contact with the stroke setting member, the deformation of the elastic body is suppressed, and thereby the variation in the stopping position of the sheet at the foremost end and the rearmost end is reduced.

  According to the electric seat slide device of the first aspect, the screw shaft and the nut are simply coupled by inserting the screw shaft into the second insertion hole of the elastic body into which the nut and the nut holding member are fitted and screwing the nut into the nut. Because it can be assembled with, it is easy to assemble. Further, since the rotation of the nut is restricted by the elastic body located on the side of the nut, it is not necessary to cover the side surface of the nut with a metal material via the elastic body as in the conventional case. Furthermore, since it is not covered with a metal material, it is sufficient that the width of the upper rail is large enough to accommodate the elastic body, and the width of the upper rail can be greatly reduced. Can be achieved.

  According to the electric seat slide device of the second aspect, when a large rotational force acts on the nut, the elastic bodies on both sides of the nut are deformed, but the side surfaces of the elastic body are close to the inner side surface of the upper rail. The rotation of the nut is supplementarily restricted by the inner side surface of the upper rail.

  According to the electric seat slide device of the third aspect, the elastic body that moves integrally with the nut makes contact with the stroke setting member so as to alleviate the impact. There is no need to provide it, and the number of parts can be reduced and the assemblability can be improved. In addition, since the stroke setting member is coupled to the upper rail, the stroke setting member is coupled to the screw shaft as in the conventional case when the gear box for reducing the rotation of the motor is arranged on the axis of the screw shaft. Unlike the case, the impact at the time of collision does not directly act on the gear box via the screw shaft.

  According to the electric seat slide device of the fourth aspect, the elastic body is formed of rubber. When the rubber hardness is set to A60 or more, the hardness becomes appropriate, and both sides of the nut are applied when a rotational force is applied to the nut. The portion located at is not easily deformed. Further, when the elastic body comes into contact with the stroke setting member, the deformation of the elastic body is suppressed, and thereby the variation in the stopping position of the sheet at the foremost end and the rearmost end is reduced.

Embodiments of an electric seat slide device according to the present invention will be described below.
(Constitution)
As shown in an exploded perspective view in FIG. 6, the electric seat slide device includes a lower rail 1 fixed to the floor of the vehicle body, and an upper rail in which the seat is coupled to the lower rail 1 so as to be slidable in the length direction. 2, a screw shaft 3 disposed along the length direction of the upper rail 2 inside the upper rail 2, a nut 7 screwed to the screw shaft 3 and coupled to the inside of the lower rail 1, A motor (not shown) that is provided on the upper rail 2 and rotationally drives the screw shaft 3, and is arranged on the axis of the screw shaft 3 to reduce the rotation of the motor and transmit it to the screw shaft 3. And a gear box 6 fixed to the upper rail 2. The electric seat slide device shown in FIG. 6 is provided at each of the left and right positions of the seat, and the front portions of the upper rail 2, which is the right end of FIG. 6, are connected by a connecting member (not shown). The output shaft of the single motor provided on the connecting member is connected to an input shaft (not shown) in the input cylinder 6 a of the left and right gear boxes 6, and the respective screw shafts are connected via the gear box 6. 3 are driven synchronously.

  As shown in FIG. 7, the lower rail 1 has a substantially U-shaped cross-section with an open top, a bottom surface portion 1a, a side wall portion 1b bent upward from the bottom surface portion 1a, and the side wall portion 1b. It is comprised from the downward bending part 1c bent toward the inner side downward from the upper end. As shown in FIG. 6, legs 19 and 20 are coupled to both ends of the lower rail 1 via bolts 15 to 18, and the legs 19 and 20 are coupled to the vehicle body floor via bolts (not shown). ing. On the other hand, the cross-sectional shape of the upper rail 2 is a substantially inverted U-shape with an opening at the bottom. It is comprised from the upward bending part 2c bent toward the direction. A sheet is coupled to the upper rail 2 via four bolts 21. The upper rail 2 is inserted into the lower rail 1 so as to be slidable in the length direction, and the upward bent portion 2c of the upper rail 2 enters between the side wall portion 1b and the downward bent portion 1c of the lower rail 1.

  A guide ball 9 is provided between the lower rail 1 and the upper rail 2. The guide balls 9 are respectively arranged at positions above and below the retainer 8 while being held by the retainer 8. The retainer 8 and the guide ball 9 are provided in two pairs at the front and rear positions as a pair of left and right.

  The screw shaft 3 is rotatably supported inside the upper rail 2 by fixing the gear box 6 to the upper rail 2. As shown in FIG. 6, the left end of the gear box 6 is attached to the right end of the upper rail 2, and the gear box 6 is coupled to the upper rail 2 via two bolts 22.

  Fixing stoppers 1d are formed on the left and right sides of the lower rail 1 to prevent the retainer 8 and the guide ball 9 from coming off and preventing displacement. On the other hand, four sets of movable stoppers 2d and 2e protrude upward and downward on the outer surface of the upward bent portion 2c of the upper rail 2. The retainer 8 is arranged between the left two sets and the right two sets of the four sets of movable stoppers 2d and 2e.

  A configuration in the vicinity of the nut 7 will be described with reference to FIGS. The nut 7 is coupled to the lower rail 1 via a nut holding member 11 and an elastic body 12. The nut holding member 11 includes a coupling portion 11a coupled to the inner bottom surface of the lower rail 1 and a pair of holding portions 11b erected at the vehicle body front-rear position of the coupling portion 11a. Each of these is formed with a first insertion hole 11c through which the screw shaft 3 is inserted. The elastic body 12 is formed in a substantially rectangular parallelepiped shape, and a recess 12b for fitting the nut 7 is formed on the upper surface of the elastic body in which the second insertion hole 12a through which the screw shaft 3 is inserted is formed. A fitting space 12c for fitting the holding portion 11b from below is formed on both sides in the direction along the second insertion hole 12a. The elastic body 12 is made of rubber, and the rubber hardness of the rubber is A60 or higher, preferably A70 or higher. A nut 7 is fitted into the recess 12b from above, and a pair of holding portions 11b are fitted into the fitting space 12c from below. The nut 7 is fitted in the recess 12b without gaps in the front and rear and left and right directions, and the screw shaft 3 inserted through the first insertion hole 11c and the second insertion hole 12a is screwed into the nut 7, and a nut holding member 11 coupling portions 11 a are coupled to the inner bottom surface of the lower rail 1 via bolts 14. Thereby, as shown in FIG. 3, the side surfaces 12d located on both sides in the moving direction of the elastic body 12 are close to the inner side surface 2x of the upper rail 2 and are slidable.

  When the vehicle collides, an impact load acts on the upper rail 2. An impact transmission means 13 is provided for preventing an impact load acting on the upper rail 2 from being transmitted from the gear box 6 coupled to the upper rail 2 to the screw shaft 3 and being transmitted directly from the upper rail 2 to the screw shaft 3. Is provided. As shown in FIGS. 4 and 5, the impact transmission means 13 includes a reinforcing plate 4 as a stroke setting member that is coupled to the inside of the upper rail 2 at right angles to the screw shaft 3, and the above-described vicinity of the reinforcing plate 4. The stopper 5 is coupled to the screw shaft 3. The impact transmission means 13 is disposed at two locations sandwiching the elastic body 12 surrounding the nut 7 from the axial direction of the screw shaft 3. That is, a pair of reinforcing plates 4 are arranged at positions sandwiching the elastic body 12, and the stoppers 5 are arranged outside the respective reinforcing plates 4.

  The mounting state of the reinforcing plate 4 will be described with reference to FIG. An upper claw portion 4a is formed at the upper center of the reinforcing plate 4, and lower claw portions 4b are formed on both sides of the lower portion. On the other hand, an upper slit 2f is formed in the upper surface portion 2a of the upper rail 2, and a lower slit 2g is formed in the lower portion of both side wall portions 2b. The upper claw portion 4a and the lower claw portion 4b are formed in the upper slit 2f and the lower slit 2g. Each is fitted. And the caulking part 4c is formed in the both sides of the upper nail | claw part 4a which protrudes outside the upper rail.

  A third insertion hole 4 d through which the screw shaft 3 is inserted is formed in the central portion of the reinforcing plate 4. When the caulking portion 4c is formed, the reinforcing plate 4 is compressed in the vertical direction, and when the impact load is applied to the upper rail 2, the reinforcing plate 4 is pressed against the stopper 5, so that the strength of the reinforcing plate 4 is increased. In order to ensure, a cylindrical portion 4e projecting to one side is integrally formed around the third insertion hole 4d. The cylindrical portion 4 e is formed at a position facing the stopper 5. Further, in order to ensure the strength of the reinforcing plate 4 when the reinforcing plate 4 is pressed against the stopper 5, the lower claw portion 4b and the cylindrical portion 4e are partially overlapped with each other in the vertical direction. By extending the upper end to the vicinity of the center of the insertion hole 4d, the length of the lower claw portion 4b in the vertical direction is long. Here, sufficient gaps are formed between the first to third insertion holes 11 c, 12 a, 4 d and the screw shaft 3.

  On the other hand, the screw shaft 3 is inserted into the stopper 5, and the stopper 5 is caulked by pressing a plurality of locations from the outer peripheral portion of the stopper 5 toward the shaft center, and the stopper 5 is coupled to the screw shaft 3.

Thus, the elastic body 12 can be moved between the pair of reinforcing plates 4, and the pair of reinforcing plates 4 also serves as a stroke setting member for setting the moving stroke of the elastic body 12. is doing.
(Function)
Next, the operation of the electric seat slide device will be described.

  When an output shaft of a motor (not shown) is rotated, the rotation of the output shaft is decelerated by a speed reducer in the left and right gear boxes 6 of the seat and transmitted to the screw shaft 3 in the upper rail 2. Then, the rotation of the screw shaft 3 causes the nut 7 coupled to the lower rail 1 to move relative to the vehicle body longitudinal direction along the screw shaft 3. For this reason, the upper rail 2 moves to the front of the vehicle body or to the rear of the vehicle body with respect to the lower rail 1. Then, when the end surface of the elastic body 12 comes into contact with any one of the reinforcing plates 4 at the front and rear of the vehicle body, the movement of the upper rail 2 in the front-rear direction is stopped. In addition, before the movable stoppers 2d and 2e positioned at the center portion of the upper rail 2 come into contact with the front or rear fixed stopper 1d of the lower rail 1 via the retainer 8, the end face of the elastic body 12 is either one of the reinforcing plates 4. The upper rail 2 stops moving in the front-rear direction. That is, the moving stroke of the upper rail 2 is set by the position where the elastic body 12 contacts the reinforcing plate 4 at the front and rear of the vehicle body.

  When an impact load directed to the front of the vehicle body is applied to the upper rail 2 due to a vehicle collision or the like, the reinforcing plate 4 in front of the vehicle body coupled to the upper rail 2 moves to the front of the vehicle body as shown in FIG. Collides with the front stopper 5. Therefore, the impact load is not directly transmitted from the upper rail 2 to the gear box 6 coupled to the upper rail 2, and the impact load that pulls the gear box 6 away from the screw shaft 3 by transmitting the impact load to the gear box 6 It is blocked from acting. At this time, a tensile force acts on the screw shaft 3. When an impact load directed toward the rear of the vehicle body is applied to the upper rail 2, the reinforcing plate 4 at the rear of the vehicle body collides with the stopper 5 at the rear of the vehicle body. Therefore, the impact load is not directly transmitted from the upper rail 2 to the gear box 6 coupled to the upper rail 2, and the impact load is transmitted to the gear box 6 and the gear box 6 is prevented from pressing the screw shaft 3. Is done. Also at this time, a tensile force acts on the screw shaft 3.

  According to the present invention, a rotational force acts on the nut 7 into which the screw shaft 3 is screwed by the rotation of the screw shaft 3, but the rotation of the nut 7 is restricted by the elastic body 12 positioned on the side of the nut 7. The Moreover, although the force which moves the nut 7 to an axial direction acts by rotation of the screw shaft 3, since the axial direction both sides of the nut 7 are hold | maintained by the holding part 11b via the elastic body 12, the movement of the nut 7 is carried out. At the same time, the nut holding member 11 and the lower rail 1 move relatively, and as a result, the upper rail 2 moves relative to the lower rail 1. Since the side surface 12d of the elastic body 12 is not covered with a metal material, when the elastic body 12 moves inside the upper rail 2, the side surface 12d of the elastic body 12 is in sliding contact with the inner side surface 2x of the upper rail 2. However, no abnormal noise is generated, and it is possible to prevent the movement resistance from increasing due to sliding. Furthermore, the screw shaft 3 is only inserted into the first insertion hole 11c of the holding portion 11b and the second insertion hole 12a of the elastic body 12, and the nut 7 moves up and down and left and right with respect to the nut holding member 11. Therefore, even if the lower rail 1 moves relative to the upper rail 2 and the relative position of the nut holding member 11 with respect to the screw shaft 3 shifts, this shift causes the nut 7 to move up and down and left and right relative to the nut holding member 11. Absorbed by movement to

  Then, the screw shaft 3 and the nut 7 are joined by simply inserting the screw shaft 3 into the second insertion hole 12a of the elastic body 12 into which the nut 7 and the nut holding member 11 are fitted and screwing into the nut 7. Can be assembled, so assembly is good. Further, since the rotation of the nut 7 is restricted by the elastic body 12 positioned on the side of the nut 7, it is not necessary to cover the side surface of the nut 7 with the metal material via the elastic body 12 as in the prior art. Further, since it is not covered with a metal material, it is sufficient if the width of the upper rail 2 is large enough to accommodate the elastic body 12, and the width of the upper rail 2 can be greatly reduced. Can be miniaturized.

  According to the present invention, when a large rotational force is applied to the nut 7, the elastic bodies 12 on both sides of the nut 7 are deformed, but the side surfaces of the elastic body 12 are close to the inner side surface 2 x of the upper rail 2. The rotation of the nut 7 is supplementarily restricted by the inner side surface 2x of the upper rail 2.

  According to this invention, the nut 7 moves along the screw shaft 3, and the nut holding member 11 and the elastic body 12 that move together with the nut 7 come into contact with the reinforcing plate 4. Since the end of the elastic body 12 is interposed between the reinforcing plate 4 and the nut holding member 11, there is a buffering action.

  And since the elastic body 12 which moves integrally with the nut 7 abuts against the reinforcing plate 4 to alleviate the impact, it is not necessary to separately provide a buffer member on the reinforcing plate 4 as in the prior art, and the number of parts is reduced. As well as improving assembly. Further, since the reinforcing plate 4 is coupled to the upper rail 2, when the gear box 6 for reducing the rotation of the motor is arranged on the axis of the screw shaft 3, the reinforcing plate 4 is screwed on the screw shaft as in the conventional case. Unlike the case of being coupled to 3, the impact at the time of collision does not directly act on the gear box 6 via the screw shaft 3.

  According to the present invention, the elastic body 12 is made of rubber, and when the rubber hardness is set to A60 or more, the hardness becomes appropriate, and the portions located on both sides of the nut 7 when a rotational force is applied to the nut 7. Is not easily deformed. Further, the deformation of the elastic body 12 is suppressed when the elastic body 12 abuts against the reinforcing plate 4, thereby reducing variations in the seat stop position at the foremost end and the rearmost end.

  In this embodiment, the gear box is arranged on the axis of the screw shaft. However, the gear box is removed from the axis of the screw shaft, and the output shaft of the gear box and the screw shaft are arranged in parallel. They may be connected via a pair of spur gears that mesh with each other, thereby enabling the gear box to move relative to the screw shaft so that no impact load is applied from the gear box to the screw shaft. Further, the stroke setting member may be coupled to the screw shaft without coupling to the upper rail. Furthermore, although the elastic body is formed of rubber, it may be formed of an elastic member other than rubber. Furthermore, the fitting space may be configured not to penetrate through the elastic body.

The perspective view (embodiment) of the vicinity of the nut in the electric seat slide device. The longitudinal cross-sectional view of the electric seat slide apparatus and the vicinity of the nut (embodiment). FIG. 4 is a cross-sectional view of the electric seat slide device in the vicinity of the nut (embodiment). Front sectional drawing of an electric seat slide device (embodiment). Action | operation explanatory drawing of an electric seat slide apparatus (embodiment). The exploded perspective view of an electric seat slide device (embodiment). Sectional drawing which shows the principal part of an electric seat slide apparatus (embodiment).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lower rail 2 ... Upper rail 2x ... Internal side surface 3 ... Screw shaft 4 ... Reinforcement plate (stroke setting member)
4d ... 3rd insertion hole 6 ... Gear box 7 ... Nut 11 ... Nut holding member 11a ... Connection part 11b ... Holding part 11c ... 1st insertion hole 12 ... Elastic body 12a ... 2nd insertion hole 12b ... Recessed part 12c ... Fitting space 12d ... side

Claims (4)

A lower rail having a substantially U-shaped cross section fixed to the vehicle body floor, an upper rail having a substantially inverted U-shaped cross section provided slidably on the lower rail, and the length of the upper rail in the upper rail. A screw shaft that is screw-coupled to the screw shaft, a nut holding member that holds the nut via an elastic body and is coupled to the inside of the lower rail, and is provided on the upper rail side. In the electric seat slide device provided with a motor for rotationally driving the screw shaft and a pair of stroke setting members for setting the movement range of the nut,
The nut holding member has a coupling portion coupled to the inside of the lower rail and a pair of retaining portions erected at the vehicle body front-rear position of the coupling portion, and the screw shaft is inserted through each of the pair of retaining portions. A first insertion hole is formed, the elastic body is an elastic block formed in a substantially rectangular parallelepiped, and a second insertion hole is formed through which the screw shaft is inserted in the length direction of the elastic body. A concave portion is formed on the upper surface, and fitting spaces are formed on both sides of the concave portion along the second insertion hole. The nut is fitted into the concave portion of the elastic body, and the holding portion is inserted into the fitting space from below. An electric seat slide device in which is inserted. The electric seat slide device according to claim 1,
The electric seat slide device characterized in that side surfaces on both sides in the moving direction of the elastic body are close to an inner side surface of the upper rail. In the electric seat slide device according to claim 1 or 2,
The pair of stroke setting members are provided on the front and rear sides of the nut so as to be coupled to the inside of the upper rail perpendicular to the screw shaft, and a third insertion hole is formed in the stroke setting member, and the third insertion hole includes the third insertion hole. An electric seat slide device in which a screw shaft is inserted. The electric seat slide device according to any one of claims 1 to 3,
The electric seat slide device, wherein the elastic body is made of rubber and has a rubber hardness of A60 or more.

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