Seat rail device

Abstract

To provide an electrically-driven seat rail device which can prevent rattling in a vertical direction while preventing increase of a slide load.SOLUTION: A seat rail device has a vertical backlash prevention member 50 including: a cam 51 having an upper surface slide part 51d which slides on a part of a lower rail formed on an upper surface and an elastic member contact surface 51c formed on a rear end; an elastic member 52 which contacts with the elastic member contact surface 51c at one end and biases the cam 51 to the tip side; a bush 53 including an elastic member support part 53c supporting the other end of the elastic member 52 and an upper rail contact surface 53d which is formed protruding so as to contact with an upper rail; and a housing member 55 having a tip opening 55a formed at a tip, a bottom surface opening 55b formed at the bottom surface side, an upper surface opening 55c formed on the upper surface, and an attachment part attachable to the upper rail, the housing member formed in a container shape.SELECTED DRAWING: Figure 3

Description

Technical Field

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[0001] The present invention relates to a seat rail device.

Background Art

[0002] In a seat rail device for a manual vehicle seat, various rattling suppression mechanisms in the left - right and up - down directions have been proposed (for example, Patent Document 1). Particularly for up - down rattling, it is possible to suppress rattling in conjunction with a locking mechanism.

[0003] However, recently, many seat rail devices for vehicles have adopted a power slide mechanism. In the case of a seat rail device using a power slide mechanism, front - rear rattling can be suppressed by the meshing of gears and screws, and left - right rattling can be suppressed by attaching left - right play suppression members. However, for up - down rattling, since there is no locking mechanism like in the manual type, a rattling suppression mechanism that operates in conjunction with a locking mechanism cannot be established, and it has been difficult to suppress up - down rattling as it is.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0007] The seat rail device according to the present invention is In a seat rail device for slidably mounting a vehicle seat, An upper rail having rollers provided on both sides and vertical wobble prevention members that prevent vertical wobble, A lower rail is formed to be longer than the upper rail and has a roller guide portion that guides the roller and the vertical wobble prevention member, Equipped with, The aforementioned vertical wobble prevention member is, A cam having a cam bottom surface formed at an angle to the upper surface so that the tip is narrow and tapered, an upper sliding portion that slides with a part of the lower rail formed on the upper surface, a bottom contact portion formed on the cam bottom surface, and an elastic member contact surface formed at the rear end, An elastic member having one end in contact with the contact surface of the elastic member and biasing the cam toward the tip, A bush comprising: a bush inclined portion that abuts against the cam bottom surface of the cam and is formed to be thicker at the tip; a bush parallel portion arranged parallel to the elastic member; an elastic member support portion that supports the other end of the elastic member; and an upper rail contact surface that protrudes to contact the upper rail. The bush is formed in a container shape having a tip opening formed at the tip, a bottom opening formed on the bottom side, a top opening formed on the top surface, and a mounting portion that can be attached to the upper rail, the bush is positioned so that the upper rail contact surface is exposed from the bottom opening, the cam is positioned so that the bottom surface of the cam faces the bush inclined surface of the bush, and the top sliding portion of the cam is exposed from the top opening, the tip of the cam is formed so that it is exposed from the tip opening, and the elastic member is housed in a housing member that is positioned between the elastic member contact surface of the cam and the elastic member support portion of the bush, It has, The upper rail contact surface is characterized in that it contacts a part of the upper rail, and the upper sliding portion is provided to be slidable with a part of the lower rail.

[0008] According to the seat rail device of the present invention, the cam and bush can maintain contact between the upper rail and the lower rail without any gaps, regardless of whether the upper rail moves in the forward or backward direction. Therefore, vertical rattling can be prevented whether the vehicle is stopped or in motion.

[0009] Furthermore, in the seat rail device according to the present invention, the cam may be characterized by having two upper sliding parts and one lower sliding part. By adopting such a configuration, the cam is formed to make contact at a total of three points: two upper sliding parts on the upper side that contact the lower upper surface, and one lower contact part on the lower side that contacts the bush. This ensures that even if there are variations in the cam, bush, and other products, three points of contact can always be made, preventing gaps from occurring.

[0010] Furthermore, in the seat rail device according to the present invention, the frictional force between the upper sliding portion and a part of the lower rail may be stronger than the frictional force between the upper rail contact surface and a part of the upper rail. By adopting such a configuration, the anti-wobble member in the vertical direction can be moved smoothly in the front-rear direction.

[0011] Furthermore, the seat rail device according to the present invention may be characterized in that the upper rail is provided with a mounting base on which a vertical wobble prevention member is placed. By adopting such a configuration, the vertical wobble prevention member can be easily attached to the upper rail.

[0012] Furthermore, the seat rail device according to the present invention may be characterized in that the upper rail is provided with a member to prevent lateral rattling. By adopting such a configuration, rattling in the lateral direction can be prevented in addition to rattling in the vertical direction.

[0013] Furthermore, in the seat rail device according to the present invention, the vertical rattling prevention member may be characterized in that two members are provided on the front and rear sides, symmetrically arranged front to back. By adopting such a configuration, the rattling prevention effect can be achieved with the same efficiency regardless of whether the device is moved in the forward or rearward direction. [Effects of the Invention]

[0014] The seat rail device according to the present invention provides an electrically operated seat rail device that can prevent vertical rattling while preventing an increase in the sliding load. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a perspective view showing a seat rail device 100 according to an embodiment. [Figure 2] Figure 2 is a perspective view showing the upper rail 30 of the seat rail device 100 according to an embodiment. [Figure 3] Figure 3A is a perspective view showing the vertical wobble prevention member 50 of the seat rail device 100 according to the embodiment. Figure 3A is a perspective view showing the cam 51, elastic member 52, and bush 53 of the vertical wobble prevention member 50 of the seat rail device 100 according to the embodiment. [Figure 4] Figure 4 is a schematic side view of the vertical wobble prevention member 50 of the trail device 100 according to the embodiment. Figure 4A is a schematic side view of the vertical wobble prevention member 50 having an upper rail 30 and a lower rail 10, and Figure 4B is a schematic side view of the vertical wobble prevention member 50 with the lower rail 10 removed and only the upper rail 30 shown. [Figure 5] FIG. 5 is an explanatory diagram for explaining an operating state when the upper rail 30 of the seat rail device 100 according to the embodiment is moved leftward. [Figure 6] FIG. 6 is an explanatory diagram for explaining an operating state when the upper rail 30 of the seat rail device 100 according to the embodiment is moved rightward.

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments and drawings described below are examples of a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations. In addition, the same or similar reference numerals are assigned to corresponding components in each figure. In the present invention, "up and down" and "front and rear" refer to the directions shown in FIG. 1, and "front" refers to the direction in which the vehicle seat moves forward.

[0017] The seat rail device 100 according to the present embodiment supports a vehicle seat (not shown) so as to be slidable in the front-rear direction, and is fixed to a vehicle floor (not shown) and used. As shown in FIG. 1 or FIG. 2, the seat rail device 100 according to the present embodiment mainly includes a lower rail 10 having a roller guide portion 19 that guides rollers 34 on both sides, an upper rail 30 that slides back and forth with respect to the lower rail 10, and an upper rail 30 that is attached to the upper rail 30 and prevents vertical play between the upper rail 30 and the lower rail 10. And a vertical play prevention member 50.

[0018] The lower rail 10 is formed in the shape of a long rail and, as shown in Figure 1, comprises a bottom portion 11 fixed to the vehicle floor and roller guide portions 19 provided on both sides of the bottom portion 11. The bottom portion 11 has a plurality of through holes (not shown) formed therein for fixing to the vehicle floor, and can be fixed to the vehicle floor using screw members or the like using these through holes. The lower rail 10 comprises a pair of lower side portions 12 erected from both sides of the bottom portion 11, a pair of lower upper portions 13 extending horizontally from the lower side portions 12 toward the center, and lower inner portions 14 extending vertically downward from the lower upper portions 13. As shown in Figure 1, the roller guide portions 19 are arranged in the order of the lower upper portion 13, the lower side portions 12 and the bottom portion 11 from the upper end of the lower inner portion 14 and are formed to surround the roller 34, which will be described later, and guide the roller 34 in the front-rear direction. Furthermore, the support bottom surface 16 that supports the roller 34 of the roller guide section 19 may be raised higher than the bottom surface 11, as shown in Figure 1.

[0019] The upper rail 30 mainly comprises a rail body 39, a lateral wobble prevention member 40, a vertical wobble prevention member 50, a cam locking part 60 that locks a cam 51 constituting the vertical wobble prevention member 50, and a motor 70 which is a power source for electrically moving the rail body 39. Two vertical wobble prevention members 50 are provided on the front and rear sides, arranged symmetrically.

[0020] As shown in Figure 2, the rail body 39 is formed as a long member having a horizontal cross-section 31 and vertical surfaces 32 that hang vertically downward from both sides of the horizontal cross-section 31. On both sides, vertically erected portions 33 are formed, having a J-shaped cross-section, so as to be positioned on the roller guide portion 19 side of the lower inner surface portion 14 of the lower rail 10. Rollers 34 are provided on these vertical portions 33. Also, as shown in Figure 2, a mounting base 35 for attaching a vertical wobble prevention member 50 is provided on the side of the rail body 39.

[0021] The lateral rattle prevention member 40 consists of a horizontal rotating roller that rotates horizontally on the side surface of the rail body 39, and prevents lateral rattle by rotating while in contact with the inner surface of the lower side surface portion 12 of the roller guide portion 19 formed on the lower rail 10.

[0022] As shown in Figures 3A and 3B, the vertical wobble prevention member 50 is provided on one or both sides of the upper rail 30 and is positioned within the roller guide portion 19 formed in the lower rail 10. The vertical wobble prevention member 50 mainly comprises a cam 51, an elastic member 52 that presses against the cam 51, a bush 53 that supports the opposite side of the elastic member 52, and a housing member 55 that houses these. Two vertical wobble prevention members 50 are provided, one on the front side and one on the rear side, arranged symmetrically front to back. However, they have the same configuration except for being formed symmetrically front to back, so here we will describe the front vertical wobble prevention member 50.

[0023] The cam 51 is tapered, with a cam bottom surface 51b that is sloped relative to the horizontal top surface, and its width narrows vertically towards the cam tip 51a. An elastic member contact surface 51c is formed on the rear end of the cam 51, which contacts the elastic member 52, and the cam 51 is biased toward the cam tip 51a side (forward side) by contacting one end of the elastic member 52. The upper side of the cam 51 has an upper sliding portion 51d that slides against the inner surface of the lower upper surface portion 13 of the roller guide portion 19 formed on the lower rail 10. As shown in Figure 3A, it is preferable to provide two upper sliding portions 51d so that they slide against the lower upper surface portion 13 at two locations, front and rear. The cam bottom surface 51b is provided with a bottom contact portion 51e that contacts the bush 53, which will be described later. The bottom contact portion 51e may contact the bush 53 over a surface, but as shown in Figure 3A, it is preferable to form it as a convex curved surface or a convex shape with corners, so that it makes point contact or line contact with the bush 53 at one point. By forming it so that it contacts the lower upper surface portion 13 at two upper sliding portions 51d on the upper side and the bush 53 at one bottom contact portion 51e on the bottom side, a total of three points of contact can be ensured, even if there are variations in products such as the cam 51 and bush 53.

[0024] The elastic member 52 is made of a spring, rubber, or the like, and is positioned between the cam 51 and the bush 53, biasing the cam 51 towards the tip.

[0025] The bush 53 is positioned on the cam bottom surface 51b side of the cam 51 and is tapered so that the width of the tip increases. It comprises a bush inclined surface 53a that contacts the cam bottom surface 51b, a bush parallel portion 53b that is positioned parallel to the elastic member 52, and an elastic member support portion 53c that supports the other end (rear side) of the elastic member 52. The bottom side of the bush 53 has an upper rail contact surface 53d that protrudes to contact a mounting base 35 formed on the upper rail 30, which will be described later. The frictional force between the mounting base 35 and the upper rail contact surface 53d is set to be weaker than the frictional force between the lower upper surface portion 13 and the upper sliding portion 51d.

[0026] The housing member 55 is a container-shaped member for mounting to the upper rail 30 with the cam 51, elastic member 52, and bush 53 described above housed inside. The housing member 55 has a tip opening 55a at its front, a bottom opening 55b on its bottom side, and an upper opening 55c on its top surface. The bush 53 is positioned inside the housing member 55 such that the upper rail contact surface 53d of the bush 53 is slightly exposed from the bottom opening 55b. The bottom opening 55b is larger than the upper rail contact surface 53d, and the bush 53 is positioned to be movable back and forth relative to the housing member 55. The cam 51 is positioned so that its bottom surface 51b faces the bush inclined surface 53a of the bush 53, and its upper sliding surface 51d protrudes from the upper opening 55c. The cam tip 51a of the cam 51 is positioned to protrude from the tip opening 55a, and is positioned to be movable back and forth relative to the housing member 55. The elastic member 52 is positioned between the contact surface 51c of the cam 51 and the elastic member support portion 53c of the bush 53. The housing member 55 also has a hook-shaped mounting portion 55e for attachment to the mounting base 35 of the upper rail 30.

[0027] As shown in Figure 2, the vertical wobble prevention member 50 manufactured as described above is attached by inserting the hook 55f into the mounting hole 36 of the mounting base 35 provided on the upper rail 30.

[0028] A cam locking portion 60 is provided near the tip 51a of the cam 51, which is positioned on a vertical wobble prevention member 50 attached to a mounting base 35.

[0029] The motor 70 can electrically move the rail body 39 via a switch located near the seat, and a known motor can be used.

[0030] The seat rail device 100 thus manufactured operates as follows. FIG. 4A shows a side schematic view of the vertical rattling prevention member 50 having the upper rail 30 and the lower rail 10. FIG. 4B shows a side schematic view of the vertical rattling prevention member 50 with the lower rail 10 removed and only the upper rail 30 shown. In both FIGS. 4A and 4B, the hatched portion is the upper rail 30, and the portion represented by dots in FIG. 4A is the lower rail 10. The state before moving the seat rail device 100 is the state shown in FIG. 4A. When the upper rail 30 is moved in the direction of the arrow (leftward in the figure) from this state, the cam 51 stops due to the friction between the upper surface sliding portion 51d and the lower upper surface portion 13 of the lower rail 10. Also, due to the friction between the bush 53 and the cam 51 and the inclination of the contact surface, the relative position between the cam 51 and the bush 53 does not change, and in this state, the upper rail contact surface 53d of the bush 53 with a weak frictional force and the mounting pedestal 35 slide, and as shown in FIG. 5A, the cam tip 51a of the cam 51 protruding from the tip opening 55a becomes shorter (d1>d2), and the gap between the tip side of the upper rail contact surface 53d and the tip side of the bottom opening 55b becomes wider (d3<d4). Then, when the upper rail 30 is further moved, the accommodating member 55 reaches the rear end of the bush 53, and thereafter, it moves so as to press the rear end of the bush 53. Due to this pressing of the bush 53, as shown in FIG. 5B, the sliding between the bush 53 and the mounting pedestal 35 of the upper rail 30 stops, the pressing force between the cam 51 and the bush 53 becomes loose, and the cam 51 and the lower upper surface portion 13 of the lower rail 10 start to slide. Thereafter, the cam 5I slides with respect to the lower rail 10, and the upper rail 30 moves together with the vertical rattling prevention member 50. During this movement, since the cam 51 is pressed toward the tip side by the elastic member 52, the relative position between the cam 51 and the bush 53 hardly changes, and it moves up and down without a gap between the lower rail 10 and the upper rail 30, so that rattling in the vertical direction between the lower rail 10 and the upper rail 30 can be prevented.

[0031] Next, as shown in FIG. 6A, the case of moving the upper rail 30 in the direction of the arrow (rightward in the figure) will be described. As shown in FIG. 6A, when the upper rail 30 is moved rightward, the cam 51 does not move in relation to the lower rail 10 due to the friction with the lower upper surface portion 13 of the lower rail 10, and the movement of the bush 53 regulated by the cam 51 is also restricted. Therefore, the housing member 55 moves rightward. At this time, the positional relationship between the cam 51 and the bush 53 does not change, and the upper rail 30 starts to slide in this state. That is, the upper rail contact surface 53d of the bush 53 and the mounting pedestal 35 slide, the cam tip 51a of the cam 51 protruding from the tip opening 55a becomes longer (d5 < d6), and the gap between the tip side of the upper rail contact surface 53d and the tip side of the bottom opening 55b becomes narrower (d7 > d8). Then, when the upper rail 30 is further moved rightward and the cam locking portion 60 abuts against the cam tip 51a of the cam 51, as shown in FIG. 6B, the cam locking portion 60 presses the cam tip 51a and moves the cam 51 so as to slide against the frictional force with the lower upper surface portion 13 of the lower rail 10. As a result, the mutual pressing force between the cam 51 and the bush 53 is loosened, and the mutual positional relationship between the cam 51 and the bush 53 hardly changes and they move. In this way, the positional relationship between the cam 51 and the bush 53 hardly changes, and they move without a gap in the vertical direction between the lower rail 10 and the upper rail 30, so that rattling in the vertical direction between the lower rail 10 and the upper rail 30 can be prevented.

[0032] Thus, according to the vertical rattling prevention member 50 according to the present invention, when the vehicle seat of the seat rail device 100 is moved forward or backward, that is, when the upper rail 30 is moved in either the front or rear direction, the mutual positional relationship between the cam 51 and the bush 53 does not change, and it can be moved. Therefore, it can be moved in a state where rattling in the vertical direction between the lower rail 10 and the upper rail 30 is prevented.

[0033] Note that the present invention is not limited to the above-described embodiments in any way, and can be implemented in various modes as long as it belongs to the technical scope of the present invention.

[0034] In the above embodiment, two vertical rattle prevention members 50 are provided symmetrically on the front and rear sides, but either one may be used. The vertical rattle prevention members 50 in this embodiment can suppress rattle in both the forward and backward directions, so the same effect can be obtained even if only one is provided. [Industrial applicability]

[0035] As shown in the embodiments described above, it is industrially applicable as a seat rail device for mounting automotive seats. [Explanation of symbols]

[0036] 10...Lower rail, 11...Bottom surface, 12...Lower side surface, 13...Lower top surface, 14...Lower inner surface, 16...Support bottom surface, 19...Roller guide section, 30...Upper rail, 31...Horizontal surface, 32...Vertical surface, 33...Upright section, 34...Roller, 35...Mounting base, 36...Mounting hole, 39...Rail body, 40...Lateral wobble prevention member, 50...Vertical wobble prevention member, 51...Cam, 51a...Cam tip, 51b...Cam bottom Surface, 51c...Elastic member contact surface, 51d...Upper sliding part, 51e...Bottom contact part, 52...Elastic member, 53...Bush, 53a...Bush inclined part, 53b...Bush parallel part, 53c...Elastic member support part, 53d...Upper rail contact surface, 55...Housing member, 55a...Tip opening, 55b...Bottom opening, 55c...Upper opening, 55e...Mounting part, 55f...Hook, 60...Cam locking part, 70...Motor, 100...Seat rail device

Claims

1. In a seat rail device for slidably mounting a vehicle seat, An upper rail having rollers provided on both sides and vertical wobble prevention members that prevent vertical wobble, A lower rail is formed to be longer than the upper rail and has a roller guide portion that guides the roller and the vertical wobble prevention member, Equipped with, The aforementioned vertical wobble prevention member is, A cam having a cam bottom surface formed at an angle to the upper surface so that the tip is narrow and tapered, an upper sliding portion that slides with a part of the lower rail formed on the upper surface, a bottom contact portion formed on the cam bottom surface, and an elastic member contact surface formed at the rear end, An elastic member having one end in contact with the contact surface of the elastic member and biasing the cam toward the tip, A bush comprising: a bush inclined portion that abuts against the cam bottom surface of the cam and is formed to be thicker at the tip; a bush parallel portion arranged parallel to the elastic member; an elastic member support portion that supports the other end of the elastic member; and an upper rail contact surface that protrudes to contact the upper rail. The bush is formed in a container shape having a tip opening formed at the tip, a bottom opening formed on the bottom side, a top opening formed on the top surface, and a mounting portion that can be attached to the upper rail, the bush is positioned so that the upper rail contact surface is exposed from the bottom opening, the cam is positioned so that the bottom surface of the cam faces the bush inclined surface of the bush, and the top sliding portion of the cam is exposed from the top opening, the tip of the cam is formed so that it is exposed from the tip opening, and the elastic member is housed in a housing member that is positioned between the elastic member contact surface of the cam and the elastic member support portion of the bush, It has, The seat rail device is characterized in that the upper rail contact surface contacts a part of the upper rail, and the upper sliding portion is slidably provided with respect to a part of the lower rail.

2. The seat rail device according to claim 1, characterized in that the cam comprises two upper sliding portions and one bottom contact portion.

3. The seat rail device according to claim 1, characterized in that the frictional force between the upper sliding portion and a part of the lower rail is stronger than the frictional force between the upper rail contact surface and a part of the upper rail.

4. The seat rail device according to claim 1, characterized in that the upper rail is provided with a mounting base on which the vertical wobble prevention member is placed.

5. The seat rail device according to claim 1, characterized in that the upper rail is provided with a member to prevent wobbling in the lateral direction.

6. The seat rail device according to any one of claims 1 to 5, characterized in that two of the aforementioned vertical wobble prevention members are provided on the front and rear sides so as to be symmetrical front to back.

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