JP7407087B2 - seat sliding device - Google Patents

Description

The present invention relates to a seat slide device that moves a seat back and forth.

2. Description of the Related Art An electric seat slide device is known that moves a seat on an upper rail side back and forth with respect to a lower rail by rotating a screw shaft attached to an upper rail with respect to a nut member attached to a lower rail. The electric seat slide device described in Patent Document 1 supports the nut member in a swingable manner by disposing an elastic member between the nut member and the bracket when the nut member is attached to the lower rail via the bracket. are doing. This makes it possible to absorb the misalignment between the axis of the screw shaft and the axis of the screw hole of the nut member. At this time, in the electric seat slide devices of Patent Documents 1 and 2, the lower surface of the nut member and the bottom surface of the lower rail are separated from each other.

Japanese Patent Application Publication No. 2010-47172 JP 2018-16237 Publication

In the electric seat slide devices described in Patent Document 1 and Patent Document 2, the lower surface of the nut member, which is spaced apart from the bottom surface (upper surface) of the lower rail, is not supported by the bracket. For this reason, the nut member tends to rotate easily and is insufficiently supported by the bracket.

Therefore, an object of the present invention is to absorb the deviation between the axis of the screw shaft and the axis of the threaded hole of the nut member by an elastic member, and to provide sufficient support of the nut member by the bracket.

The seat slide device of the present invention includes a lower rail that extends along the longitudinal direction of a vehicle, an upper rail that moves relatively along the longitudinal direction of the lower rail, and a seat slide device that is rotatably attached to either the lower rail or the upper rail. a screw shaft extending along the direction of relative movement; a nut member attached to the other of the lower rail and the upper rail and threaded onto the screw shaft; an elastic member having a square cylindrical shape that covers four sides and having a through hole that overlaps with a screw hole that passes through the nut member in the front-rear direction; and an elastic member that is supported on the outside of the elastic member so as to cover the four sides of the nut member. and a bracket. The bracket includes a first plane facing the upper surface of the nut member, a pair of first wall surfaces extending downward from both ends of the first plane in the front and back direction and facing the front and rear surfaces of the nut member, respectively; a first bracket having a pair of first mounting surfaces extending in directions away from each other from the lower ends of the pair of first wall surfaces, a second plane facing the lower surface of the nut member, and both ends of the second plane in the front-rear direction. a pair of second wall surfaces extending downward from the first bracket and respectively opposing the pair of first wall surfaces of the first bracket; A second bracket having a pair of second mounting surfaces located between the first mounting surface and the bottom surface of the lower rail.

According to the present invention, the deviation between the axis of the screw shaft and the axis of the screw hole of the nut member can be absorbed by the elastic member, and the nut member can be sufficiently supported by the bracket.

FIG. 1 is an exploded perspective view of a seat slide device according to an embodiment. FIG. 1B is an exploded perspective view showing the nut member, bracket, and elastic member of FIG. 1A. FIG. 1A is a perspective view of the seat slide device with the front and rear directions reversed. 3 is a sectional view taken along line III-III in FIG. 2. FIG. FIG. 3 is a perspective view of the vicinity of a drive unit of the seat slide device of FIG. 2; FIG. 1B is a cross-sectional view showing an attached state of a nut member used in the seat slide device of FIG. 1A. FIG. 1B is a perspective view showing the internal structure of the nut member used in the seat slide device of FIG. 1A in an attached state.

Embodiments of the present invention will be described below based on the drawings. Note that the direction indicated by arrow FR in the figure is the front of the vehicle body, the direction indicated by arrow RR is the rear of the vehicle body, the direction indicated by arrow LH is the left side of the vehicle body, and the direction indicated by arrow RH is the right side of the vehicle body. The longitudinal direction of the vehicle body is reversed in FIG. 1A and FIG. 2. In the following description, "front-back direction" and "horizontal direction" correspond to "front-back direction of the vehicle body" and "horizontal direction of the vehicle body," respectively, unless otherwise specified.

As shown in FIGS. 1A and 2, the electric seat slide device installed in an automobile includes a lower rail 1 that is fixed to the floor of the vehicle body and extends along the longitudinal direction of the vehicle, and a lower rail 1 that extends in the longitudinal direction inside the lower rail 1. The upper rail 3 is provided with an upper rail 3 that moves relatively along the upper rail 3. The upper rail 3 is attached to the lower surface of the seat (not shown). Therefore, the seat, together with the upper rail 3, moves in the front-rear direction with respect to the lower rail 1 attached to the floor surface of the vehicle body. A lower rail 1 and an upper rail 3 constitute a rail body.

As shown in FIG. 3, the lower rail 1 includes inclined walls 1b and 1c extending outward and obliquely upward from both left and right ends of a bottom wall 1a, left and right side walls 1d extending upward from the upper ends of the inclined walls 1b and 1c, 1e is formed. Upper walls 1f and 1g are formed that extend inward from the upper ends of the left and right side walls 1d and 1e, and inner walls that extend downward from the inner ends of the upper walls 1f and 1g substantially parallel to the side walls 1d and 1e. 1h and 1i are formed. The bottom wall 1a of the lower rail 1 is fixed to the floor surface of the vehicle body via a plurality of fixtures (not shown).

The upper rail 3 has left and right side walls 3b and 3c extending downward from both left and right sides of the top wall 3a, and folded portions 3d and 3e that bend outward from the lower ends of the left and right side walls 3b and 3c. The folded parts 3d, 3e include lower ball holding parts 3d1, 3e1 extending outward and upward from the lower ends of the side walls 3b, 3c, and inclined parts 3d2, 3e2 extending outward and obliquely upward from the lower ball holding parts 3d1, 3e1. , upper ball holding portions 3d3 and 3e3 extending upwardly inward from the inclined portions 3d2 and 3e2. The top wall 3a of the upper rail 3 is fixed to the lower surface of the seat via a plurality of seat-side fittings (not shown).

Lower guide balls 5, 7 and upper guide balls 9, 11 are rotatably housed between the lower ball holding parts 3d1, 3e1 and upper ball holding parts 3d3, 3e3 of the upper rail 3 and the lower rail 1, respectively. . The lower guide balls 5, 7 and the upper guide balls 9, 11 are supported by ball retainers 13, 15. The lower ball holding parts 3d1, 3e1 and the upper ball holding parts 3d3, 3e3 are curved in a concave shape on the lower guide balls 5, 7 and upper guide balls 9, 11 side. When the upper rail 3 moves forward and backward relative to the lower rail 1, the lower guide balls 5, 7 and the upper guide balls 9, 11 rotate, which suppresses friction between the rails and enables smooth movement. Become.

As shown in FIGS. 1A and 2, fixed stoppers 1s are formed on the left and right sides near both front and rear ends of the lower rail 1, and on the left and right sides near the middle part of the lower rail 1, respectively. The fixed stopper 1s engages with the ball retainers 13, 15 to prevent the plurality of lower guide balls 5, 7 and upper guide balls 9, 11 from coming off the lower ball holding parts 3d1, 3e1 and the upper ball holding parts 3d3, 3e3. and suppresses displacement in the front-back direction.

A screw shaft 17 is arranged inside the upper rail 3 and extends along the moving direction of the upper rail 3. The screw shaft 17 has approximately the same length as the upper rail 3 and is supported by the upper rail 3. On the other hand, a nut member 19 is attached to the bottom wall 1a slightly rearward of the longitudinal center of the lower rail 1. The nut member 19 includes a female threaded portion 19a serving as a screw hole into which the male threaded portion 17a of the screw shaft 17 is screwed. That is, as the screw shaft 17 rotates, the screw shaft 17 (upper rail 3) moves in the front-back direction with respect to the nut member 19 (lower rail 1).

The screw shaft 17 is rotationally driven by a drive section 25 including a motor 21 and a gear box 23, as shown in FIGS. 2 and 4. Note that the drive unit 25 is omitted in FIG. 1A. As shown in FIG. 4, the drive unit 25 is attached to a pair of left and right mounting plates 3f formed at the front end of the upper rail 3 in the longitudinal direction. The drive unit 25 is attached to the attachment plate 3f by a drive unit attachment hole 3fh (FIG. 1A) formed in the attachment plate 3f and fasteners 27 (crimping pins, bolts and nuts, etc.).

As shown in FIG. 1A, serrations 17b are formed at the front end of the screw shaft 17. By coupling the serrations 17b to a worm wheel (not shown) rotatably supported within the gear box 23, the screw shaft 17 and the drive unit 25 are coupled. The electric seat slide devices excluding the motor 21 are provided at the left and right positions of the seat, respectively. An output shaft of a single motor 21 provided in one of the electric seat slide devices of the seat is connected to an input shaft (not shown) of a gear box 23 of the other electric seat slide device by a connecting member (not shown). As a result, the screw shafts 17 of the left and right electric seat slide devices are driven in synchronization.

Reinforcement plates 29 and 31 are attached to the front and rear sides of the upper rail 3. The reinforcing plates 29 and 31 are substantially plate-shaped and are perpendicular to the screw shaft 17, and are attached to the inside of the upper rail 3 so as to straddle the left and right side walls 3b and 3c of the upper rail 3. The reinforcing plates 29, 31 are attached to slits 3g formed in the side walls 3b, 3c of the upper rail 3 by caulking the left and right caulking portions 29a, 29b at the upper end portions.

In the reinforcing plate 29, a plate through hole 29d is formed in the center of the plate-like portion 29c, and the screw shaft 17 is inserted through the plate through hole 29d. The inner diameter of the plate through hole 29d is larger than the outer diameter of the screw shaft 17. Therefore, the screw shaft 17 is rotatable relative to the reinforcing plate 29 while being inserted into the plate through hole 29d.

The upper rail protrusion 3p protrudes downward slightly from the center of the upper rail 3 in the front-rear direction. As shown in FIG. 3, the upper rail protrusion 3p is directed downward so as to be continuous from the left and right side walls 3b, 3c by leaving the portions between the left and right side walls 3b, 3c and the folded parts 3d, 3e unbent. It protrudes and is formed on both the left and right sides. As shown in FIGS. 1A and 3, the lower rail side protrusions 1p provided at the front and rear are formed by cutting and raising the bottom wall 1a of the lower rail 1 upward, and the lower rail side protrusions 1p provided on the left and right sides correspond to the left and right upper rail protrusions 3p. Formed on both sides.

A bearing nut 33 is disposed on the front side of the front reinforcing plate 29, and a bearing nut 35 is disposed on the rear side of the rear reinforcing plate 31, respectively. The bearing nuts 33 and 35 are lock nuts whose threads have been partially crushed in advance, and are fixed at a predetermined position by screwing them into the male threaded portion 17a of the screw shaft 17 to a predetermined position. Note that with a normal nut screwed into a predetermined position of the male threaded portion 17a of the screw shaft 17, the nut is fixed to the screw shaft 17 by caulking by pressing at multiple locations from the outer circumference of the nut toward the shaft center. You can do it like this.

When an impact load toward the front of the vehicle is applied to the upper rail 3 due to a vehicle collision or the like, the reinforcement plate 29 at the front of the vehicle moves toward the front of the vehicle, so that the reinforcement plate 29 collides with the bearing nut 33 at the front of the vehicle. Therefore, direct transmission of impact load from the upper rail 3 to the gear box 23 coupled to the upper rail 3 can be suppressed. Thereby, it is possible to suppress the application of an impact load that would cause the gear box 23 to be separated from the screw shaft 17 due to the impact load being transmitted to the gear box 23 . At this time, a tensile force acts on the screw shaft 17.

When an impact load toward the rear of the vehicle acts on the upper rail 3, the reinforcement plate 31 at the rear of the vehicle collides with the bearing nut 35 at the rear of the vehicle. Therefore, direct transmission of impact load from the upper rail 3 to the gear box 23 coupled to the upper rail 3 can be suppressed. As a result, impact load is transmitted to the gear box 23 and the gear box 23 is prevented from pressing the screw shaft 17. At this time as well, a tensile force acts on the screw shaft 17.

The screw shaft 17 is disposed within the upper rail 3, and a rear end portion 17c on the rear side is rotatably supported by a bearing portion 37a of the end cap 37. The end cap 37 is attached by being engaged with the engagement holes 3h formed in the side walls 3b, 3c of the upper rail 3 by a pair of left and right engagement claws 37b provided on the outer circumference of the bearing portion 37a. A male thread is formed in a front end portion 17d of the screw shaft 17 further forward than the serrations 17b. As shown in FIG. 4, the screw shaft 17 is fixed to a worm wheel (not shown) in the gear box 23 in the axial direction by screwing the nut 36 into the male thread.

Next, a structure for attaching the nut member 19 to the lower rail 1 will be described.

The nut member 19 is attached to the lower rail 1 with a bracket 39, as shown in FIGS. 5 and 6. The bracket 39 includes a first bracket 41 that covers the upper side of the nut member 19 and a second bracket 43 that covers the lower side of the nut member 19. An elastic member 45 is interposed between the first bracket 41 and the second bracket 43 and the nut member 19. The elastic member 45 is made of an elastically deformable material such as rubber, and has a hollow interior.

As shown in FIG. 1B, the nut member 19 has an upper surface 19b, a lower surface 19c, a left side surface 19d, a right side surface 19e, a front surface 19f, and a rear surface 19g, and has an approximately rectangular parallelepiped shape as a whole. A female threaded portion 19a is formed that penetrates between the front surface 19f and the rear surface 19g in the front-rear direction. Regulating protrusions 19h that protrude forward and rearward are formed on the front 19f and rear 19g sides of the left side surface 19d, respectively.

Regulating protrusions 19i that protrude forward and rearward are formed on the front 19f and rear 19g sides of the right side surface 19e, respectively. Each regulating protrusion 19h, 19i is formed over the entire length of the nut member 19 in the vertical direction. The regulating protrusions 19h and 19i are arranged to sandwich the elastic member 45 from both left and right sides with the nut member 19 disposed inside the elastic member 45.

The first bracket 41 includes a first plane 41a facing the upper surface of the nut member 19, and a pair of first wall surfaces extending downward from both ends of the first plane 41a in the front and back direction and facing the front and rear surfaces of the nut member 19, respectively. 41b. The first bracket 41 includes a pair of first mounting surfaces 41c extending in a direction away from each other (front-back direction) from the lower ends of the pair of first wall surfaces 41b.

An insertion hole 41bh into which the screw shaft 17 is inserted is formed in the first wall surface 41b. The inner diameter of the insertion hole 41bh is larger than the outer diameter of the screw shaft 17. An attachment hole 41ch for attaching the first bracket 41 and the second bracket 43 to the bottom wall 1a of the lower rail 1 is formed in the first attachment surface 41c.

The second bracket 43 includes a second plane 43a facing the lower surface of the nut member 19, and a pair of second wall surfaces 43b extending downward from both ends of the second plane 43a in the axial direction. The pair of second wall surfaces 43b are opposed to (or may be in contact with) a portion of the lower side of the pair of first wall surfaces 41b of the first bracket 41 with a slight gap between them. The second bracket 43 includes a pair of second mounting surfaces 43c extending in a direction away from each other (front-back direction) from the lower ends of the pair of second wall surfaces 43b. The pair of second mounting surfaces 43c are located between the pair of first mounting surfaces 41c of the first bracket 41 and the bottom wall 1a of the lower rail 1.

A positioning hole 43ah is formed in the second plane 43a. A pair of positioning projections 45f and 45g (FIG. 5) of the elastic member 45, which will be described later, are fitted into the positioning hole 43ah. The positioning protrusions 45f and 45g have a rectangular shape that is long in the left-right direction. A mounting hole 43ch for mounting the second bracket 43 and the first bracket 41 to the bottom wall 1a of the lower rail 1 is formed in the second mounting surface 43c. As shown in FIG. 5, with the first mounting surface 41c of the first bracket 41 superimposed on the second mounting surface 43c of the second bracket 43, a caulking pin is inserted as a fixture 47 into the mounting hole 41ch and the mounting hole. 43ch from below and fix by caulking from the first mounting surface 41c side.

The first bracket 41 and the second bracket 43 are formed of metal plates, and the second bracket 43 has a thinner plate thickness than the first bracket 41. As shown in FIG. 1B, a V-shaped recess 43d is formed at the corner between the second plane 43a of the second bracket 43 and the pair of second wall surfaces 43b. By forming the recessed portion 43d, it functions as a reinforcing portion. The first bracket 41 and the second bracket 43 have substantially the same width in the left-right direction.

The elastic member 45 includes a damper upper surface 45a located between the first plane 41a of the first bracket 41 and the upper surface 19b of the nut member 19, as shown in FIGS. 1B and 5. A damper front surface 45b and a damper rear surface 45c are formed from the front edge and the rear edge of the damper upper surface 45a, respectively, extending downward. Damper through holes 45bh and 45ch are formed in the damper front surface 45b and the damper rear surface 45c, respectively, as through holes penetrating in the front-rear direction. The screw shaft 17 is inserted into the damper through holes 45bh and 45ch. The inner diameters of the damper through holes 45bh and 45ch are larger than the outer diameter of the screw shaft 17, and are approximately equal to the insertion hole 41bh of the first bracket 41.

The left and right edges of the damper front surface 45b and the damper rear surface 45c are located inside the left and right edges of the damper upper surface 45a. In other words, the left and right edges of the damper top surface 45a protrude further outward in the left and right direction than the left and right edges of the damper front surface 45b and the damper rear surface 45c.

A damper front lower surface 45d and a damper rear lower surface 45e are formed as lower surface portions, respectively, extending from the lower ends of the damper front surface 45b and the damper rear surface 45c toward mutually opposing sides. The front end portions of the damper front lower surface 45d and the damper rear lower surface 45e are separated from each other with a slight gap. Positioning protrusions 45f and 45g that protrude downward are formed at the center in the left-right direction at the tips in the front-rear direction of the damper front lower surface 45d and the damper rear lower surface 45e. The positioning protrusions 45f and 45g are in a state where their opposing surfaces are substantially in contact with each other, and are fitted into the positioning hole 43ah of the second bracket 43 and positioned in the contact state. The left and right edges of the damper front lower surface 45d and the damper rear lower surface 45e are located at approximately the same position as the left and right edges of the damper upper surface 45a.

As shown in FIG. 5, when the nut member 19 is assembled to the bracket 39, the elastic member 45 is attached to four surrounding surfaces (damper upper surface 45a, damper front surface 45b, damper rear surface 45c, damper front lower surface 45d, and damper rear lower surface 45e). ) has the following positional relationship with respect to the first bracket 41, the second bracket 43, and the nut member 19. That is, the front and rear damper front surfaces 45b and damper rear surfaces 45c are pressed against the inner surfaces of the pair of first wall surfaces 41b of the opposing first brackets 41, and between the front surfaces 19f and rear surfaces 19g of the opposing nut members 19, respectively. They are in close contact with each other. The damper upper surface 45a is in close contact with the first plane 41a of the opposing first bracket 41 and with the upper surface 19b of the opposing nut member 19, respectively (abutting with almost no gap). The damper front lower surface 45d and the damper rear lower surface 45e are in substantially close contact with the second plane 43a of the opposing second bracket 43 and with the opposing lower surface 19c of the nut member 19, respectively.

The width between the left side surface 19d and the right side surface 19e of the nut member 19 is formed to be slightly smaller than the width between the left and right edges of the first bracket 41 and the second bracket 43. . Therefore, the regulating protrusions 19h and 19i of the nut member 19 face the pair of first wall surfaces 41b of the first bracket 41, respectively. At this time, the tips of the regulating protrusions 19h, 19i are spaced apart from the pair of first wall surfaces 41b, and a gap is formed between the regulating protrusions 19h, 19i and the pair of first wall surfaces 41b. Therefore, when a load is applied to the upper rail 3 in the front-rear direction and the elastic member 45 is compressed, the tips of the regulating projections 19h and 19i come into contact with the pair of first wall surfaces 41b.

Next, the effects of this embodiment will be explained.

The seat slide device of the present embodiment includes a lower rail 1 extending along the longitudinal direction of the vehicle, an upper rail 3 moving relatively along the longitudinal direction of the lower rail 1, and rotating in either one of the lower rail 1 and the upper rail 3. A screw shaft 17 that is freely attached and extends along the direction of relative movement, a nut member 19 that is attached to the other of the lower rail 1 or the upper rail 3 and screwed into the screw shaft 17, and both upper and lower surfaces of the nut member 19. and an elastic member 45 having a rectangular cylindrical shape that covers four sides of the front and back surfaces, and having damper through holes 45bh and 45ch that overlap the female threaded portion 19a that passes through the nut member 19 in the front and back direction, and a nut member on the outside of the elastic member 45. It has a bracket 39 that supports so as to cover the four sides of 19.

The bracket 39 is composed of a first bracket 41 and a second bracket 43. The first bracket 41 has a first plane 41a facing the upper surface 19b of the nut member 19, and a pair of first planes extending downward from both ends of the first plane 41a in the front and back direction and facing the front and rear surfaces of the nut member 19, respectively. It has a wall surface 41b and a pair of first mounting surfaces 41c extending in a direction away from each other from the lower ends of the pair of first wall surfaces 41b. The second bracket 43 has a second plane 43a facing the lower surface of the nut member 19, and a pair extending downward from both ends of the second plane 43a in the front and back direction, and facing the pair of first wall surfaces 41b of the first bracket 41, respectively. a pair of second mounting surfaces extending in directions away from each other from the lower ends of the pair of second wall surfaces 43b and located between the pair of first mounting surfaces 41c of the first bracket 41 and the bottom surface of the lower rail 1. It has a surface 43c.

In the seat slide device configured in this manner, the nut member 19 is supported by two brackets, the first bracket 41 and the second bracket 43, so as to sandwich the nut member 19 from the vertical direction and the front/back direction. Therefore, even if the lower surface of the nut member 19 and the bottom surface of the lower rail 1 (the upper surface of the bottom wall 1a) are apart, the nut member 19 is not supported by the bracket 39 because the lower surface of the nut member 19 is supported. It will be sufficient. Thereby, rotation of the nut member 19 around the axis can be suppressed when the screw shaft 17 rotates, and generation of abnormal noise and vibration can be reduced.

At this time, an elastic member 45 is interposed between the nut member 19 and the bracket 39. Therefore, the nut member 19 is swingable in the vertical, horizontal, and longitudinal directions with respect to the screw shaft 17, and it is possible to suppress the generation of abnormal noise and vibration when the screw shaft 17 rotates. That is, the elastic member 45 can absorb the misalignment between the axis of the screw shaft 17 and the axis of the female threaded portion 19a of the nut member 19. Since the elastic member 45 is generally plate-shaped and has a shape that covers the four sides around the nut member 19, it can be made smaller and lighter, which can contribute to cost reduction.

Since the first wall surface 41b of the first bracket 41 and the second wall surface 43b of the second bracket 43 are in contact with each other, the strength of the bracket 39 is maintained high, and the variation in the position of the nut member 19 against the load (bracket 39) can be kept small. Since the first bracket 41 and the second bracket 43 have a simple shape of a long plate material bent into a substantially ohm (Ω) shape, they have excellent workability and can keep manufacturing costs low. Since the outer first bracket 41 does not need to provide an engagement hole for engagement with the elastic member 45, it can maintain high strength.

In the elastic member 45 of this embodiment, a damper front lower surface 45d and a damper rear lower surface 45e located between the lower surface 19c of the nut member 19 and the second plane 43a of the second bracket 43 are divided into two parts in the front and rear. A pair of positioning protrusions 45f and 45g that protrude downward are formed on mutually opposing portions of the damper front lower surface 45d and damper rear lower surface 45e, which are divided into two parts, and the pair of positioning protrusions 45f and 45g are connected to the second bracket. 43 is inserted into a positioning hole 43ah provided in the second plane 43a and penetrating vertically.

Both the front and rear surfaces of the nut member 19 have regulating protrusions 19h and 19i that respectively protrude from the left and right side ends toward the pair of first wall surfaces 41b of the first bracket 41. The regulating protrusions 19h and 19i protrude so as to sandwich the elastic member 45 from both sides, and are located further away from the first wall surface 41b of the first bracket 41 than the elastic member 45 is.

In this case, the elastic member 45 positions the positioning protrusions 45f and 45g by fitting them into the positioning holes 43ah of the second bracket 43 located inside. Therefore, the first bracket 41 located on the outside does not need to provide a positioning hole for positioning the elastic member 45, and can maintain high strength. Since the elastic member 45 wraps around and covers the four surfaces around the nut member 19, it can be easily attached to the nut member 19 even if it is provided with the regulating protrusions 19h and 19i.

The regulating protrusions 19h and 19i face the first wall surface 41b of the first bracket 41. In this case, the load acting on the upper rail 3 in the front-rear direction is received by the elastic member 45 via the screw shaft 17 and the nut member 19. At this time, when the elastic member 45 is elastically deformed by a predetermined amount or more in the front-rear direction, the regulating protrusions 19h, 19i directly contact the first wall surface 41b. Thereby, deterioration in durability due to excessive compression of the elastic member 45 can be suppressed. By suppressing deterioration in the durability of the elastic member 45, generation of abnormal noise can be suppressed. The regulating protrusions 19h and 19i can suppress misalignment between the nut member 19 and the elastic member 45 in the left-right direction.

To assemble the nut member 19 and the bracket 39, with the elastic member 45 wrapped around the nut member 19, while fitting the positioning protrusions 45f and 45g into the positioning hole 43ah of the second bracket 43, the elastic member 45 is placed on the second plane. 43a. Next, the first bracket 41 is placed over the elastic member 45. In this case, it is easy to assemble the nut member 19 and the bracket 39, and the assemblability is improved.

The second bracket 43 of this embodiment is provided with a reinforcing recess 43d at the corner between the second plane 43a and the second wall surface 43b. Therefore, the strength of the second bracket 43 can be ensured to be high, and the variation in the position of the nut member 19 (the amount of deformation of the bracket 39) with respect to the load can be made smaller.

In this embodiment, the thickness of the second bracket 43 is thinner than the thickness of the first bracket 41. In this case, while the strength of the bracket 39 is improved as described above, the thickness of the entire mounting surface of the first mounting surface 41c and the second mounting surface 43c becomes thinner. This allows the height of the fixture 47 to protrude upward from the bottom surface (bottom wall 1a) of the lower rail 1 to be lower. Since the outer first bracket 41 is thicker than the inner second bracket 43, the strength of the bracket 39 as a whole is increased.

Although the embodiments of the present invention have been described above, these embodiments are merely examples described to facilitate understanding of the present invention, and the present invention is not limited to the embodiments. The technical scope of the present invention is not limited to the specific technical matters disclosed in the above embodiments, but also includes various modifications, changes, alternative techniques, etc. that can be easily derived therefrom.

For example, in the above embodiment, the screw shaft 17 is attached to the upper rail 3 and the nut member 19 is attached to the lower rail 1, but the screw shaft 17 may be attached to the lower rail 1 and the nut member 19 is attached to the upper rail 3.

1 Lower rail 3 Upper rail 17 Screw shaft 19 Nut member 19a Female threaded part (screw hole) of nut member
19b Upper surface of the nut member 19c Lower surface of the nut member 19f Front surface of the nut member 19g Rear surface of the nut member 19h, 19i Regulating protrusion of the nut member 39 Bracket 41 First bracket 41a First plane of the first bracket 41b Pair of first brackets of the first bracket 1 wall surface 41c a pair of first mounting surfaces of the first bracket 43 a second bracket 43a a second plane of the second bracket 43ah a positioning hole of the second bracket 43b a second wall surface of the pair of second brackets 43c a pair of first mounting surfaces of the second bracket 2 Mounting surface 43d Recessed part (reinforced part) of the second bracket
45 Elastic member 45bh, 45ch Damper through hole (through hole) of elastic member
45d Front lower surface of damper (lower surface part) of elastic member
45e Rear lower surface of damper (lower surface part) of elastic member
45f, 45g Elastic member positioning protrusion

Claims (4)

A lower rail that extends along the longitudinal direction of the vehicle;
an upper rail that moves relatively along the longitudinal direction of the lower rail;
a screw shaft rotatably attached to either the lower rail or the upper rail and extending along the direction of relative movement;
a nut member attached to the other of the lower rail and the upper rail and threaded onto the screw shaft;
an elastic member having a square cylindrical shape that covers both upper and lower surfaces and front and rear surfaces of the nut member, and having a through hole that overlaps with a screw hole that passes through the nut member in the front and back direction;
a bracket that supports the nut member so as to cover the four sides of the nut member on the outside of the elastic member;
The bracket is
a first plane facing the upper surface of the nut member; a pair of first wall surfaces extending downward from both ends of the first plane in the front and back direction and facing the front and rear surfaces of the nut member, respectively; a first bracket having a pair of first mounting surfaces extending in directions away from each other from the lower end of the wall surface;
a second plane facing the lower surface of the nut member; a pair of second wall surfaces extending downward from both ends of the second plane in the front-rear direction and respectively opposing the pair of first wall surfaces of the first bracket; A second bracket having a pair of second mounting surfaces extending in directions away from each other from lower ends of the pair of second wall surfaces and located between the pair of first mounting surfaces of the first bracket and the bottom surface of the lower rail. A seat slide device comprising: In the elastic member, a lower surface portion located between the lower surface of the nut member and the second plane of the second bracket is divided into two parts in the front and rear, and mutually opposing portions of the divided lower surface portions include: A pair of positioning protrusions are respectively formed that protrude downward, and the pair of positioning protrusions are inserted into vertically penetrating positioning holes provided on the second plane of the second bracket,
The nut member has restricting protrusions on both the front and rear surfaces thereof, each protruding from the left and right side ends toward the first wall surfaces of the pair of first brackets, and the restricting protrusions sandwich the elastic member from both the left and right sides. 2. The seat slide device according to claim 1, wherein the seat slide device protrudes from the first wall of the first bracket and is located further away from the first wall surface of the first bracket than the elastic member. The seat slide device according to claim 1 or 2, wherein the second bracket is provided with a reinforcing portion at a corner between the second plane and the second wall surface. 4. The seat slide device according to claim 1, wherein the second bracket has a thickness smaller than that of the first bracket.

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