JP7235945B2 - seat rail device - Google Patents

Description

The present invention relates to a seat rail device for sliding a vehicle seat forward and backward.

2. Description of the Related Art Conventionally, as a seat rail device for sliding a vehicle seat back and forth, for example, a seat rail device disclosed in Japanese Unexamined Patent Application Publication No. 2002-200002 is known. In this seat rail device, the upper rails slide relative to the lower rails such that the rollers provided on each of the first upper rail and the second upper rail that constitute the upper rails are guided by the guide portions of the lower rails. Thus, the vehicle seat to which the upper rail is fixed is supported so as to be slidable in the front-rear direction with respect to the vehicle floor to which the lower rail is fixed.

JP 2015-186984 A

In the structure where the rollers are guided by the guide section as described above, rattling may occur during sliding. In order to suppress rattling while realizing a low sliding load, the guide structure adds side rollers guided by the guide section. can be considered. That is, when the rollers supported by the upper rail are in rolling contact with the guide portion in the vertical direction, the side rollers are supported by the upper rail so as to be in rolling contact with the guide portion in the horizontal direction perpendicular to the vertical direction. By doing so, rattling can be suppressed.

By the way, in order to bring the rollers and the side rollers into rolling contact with the guide portion in directions perpendicular to each other, for example, as shown in FIG. A support structure in which the side rollers 112 are supported by the support portions 102 formed by cutting down is conceivable. However, if a part of the outer wall 101 is cut down to form the support portion 102 as described above, there is a problem that the rigidity of the upper rail 100 is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and its object is to provide a structure capable of suppressing rattling and reducing the slide load without lowering the rigidity of the upper rail. That's what it is.

In order to achieve the above object, the invention of claim 1 described in the scope of claims is
It has a lower rail (20) fixed to the vehicle body and an upper rail (30) fixed to the seat, and a roller (61) supported by the upper rail is attached to guide portions (22a, 22b) provided on the lower rail. A seat rail device (10) in which the upper rail is slidably assembled to the lower rail by being guided,
brackets (40a to 40d, 50a, 50b) fixed to the upper rail and supporting a second roller (62) guided by the guide part;
The guide portion has a first surface (23) and a second surface (24) which are arranged to face each other and which come into contact with one of the rollers during rolling contact, and the first surface and the second surface. a connecting surface (25) is formed,
The bracket includes a fixed portion that is welded and fixed to the upper rail and a support piece that extends substantially perpendicularly to the fixed portion,
the second roller is supported by the support pieces (42, 54) entering the guide portion and is in rolling contact with the connecting surface;
The support piece has a narrow portion formed between the fixed portion and a position where the second roller is supported, and the position where the second roller is supported is a sliding direction with respect to the narrow portion. is shifted in a direction away from the fixing portion .
It should be noted that the symbols in parentheses above indicate the corresponding relationship with specific means described in the embodiments to be described later.

In the first aspect of the invention, the upper rail is slidably assembled to the lower rail by guiding the roller supported by the upper rail to the guide portion provided on the lower rail, and the guide portion is arranged to face the roller. As a result, a first surface and a second surface which are in contact with one of the rollers during rolling contact , and a connection surface which connects the first surface and the second surface are formed. A bracket is provided that is fixed to the upper rail and supports a second roller that is guided by the guide portion. rolling contact.

As a result, the roller is in rolling contact with one of the first and second surfaces of the guide part, and the second roller is in rolling contact with the connecting surface of the guide part, realizing a low sliding load during sliding. While sliding, rattling can be suppressed. In particular, since the second roller is supported by the upper rail via the bracket, there is no need to cut down a part of the upper rail, so the rigidity of the upper rail is not lowered. Therefore, rattling can be suppressed and the slide load can be reduced without lowering the rigidity of the upper rail.

In particular, the bracket includes a fixed portion that is welded and fixed to the upper rail, and a support piece that extends substantially perpendicularly to the fixed portion. The position where the narrow width portion is formed and the second roller is supported is set so as to be offset from the narrow width portion in the sliding direction in the direction away from the fixed portion . Therefore, when the second roller comes into rolling contact with the connecting surface of the guide portion, the supporting piece is likely to be elastically deformed starting from the narrow width portion, so that the second roller may be pressed against the connecting surface more than necessary. do not have. This makes it possible to further reduce the slide load.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the sheet|seat slide apparatus which concerns on 1st Embodiment of this invention, FIG.1(A) shows a top view, FIG.1(B) shows a side view. 2A is a cross-sectional view showing the X1-X1 cross section of FIG. 1, and FIG. 2B is a cross-sectional view showing the X2-X2 cross section of FIG. It is a side view which shows the state which removed the lower rail from FIG.1(B). FIG. 4 is an exploded perspective view showing a state in which the upper rail and the like shown in FIG. 3 are exploded; It is a perspective view which shows a pair of front side bracket. 6(A) is a plan view, FIG. 6(B) is a side view, and FIG. 6(C) is a rear view. FIG. show. It is an explanatory view explaining relation between roller pitch and lower rail width. It is a perspective view showing a pair of rear side brackets. 9A is a plan view, FIG. 9B is a side view, and FIG. 9C is a rear view. FIG. indicates It is a perspective view explaining the reinforcement bracket in the seat rail apparatus concerning the 1st modification of this embodiment. FIG. 11 is a perspective view illustrating a reinforcing bracket in a seat rail device according to a second modified example of the present embodiment; It is explanatory drawing explaining the structure by which a side roller is supported by the support part which cut down a part of upper rail.

[First embodiment]
A seat rail device according to a first embodiment of the present invention will be described below with reference to the drawings.
A seat rail device 10 according to the present embodiment is a device for fixing a vehicle seat (not shown) to a vehicle floor (not shown) so as to be slidable back and forth. 1 to 4, the seat rail device 10 mainly includes a lower rail 20 fixed to the vehicle floor, an upper rail 30 fixed to the vehicle seat, the lower rail 20 and the upper rail 30. A left and right pair of locking members 70 that can be fixed (locked) so as not to move relative to each other and rattling prevention members 80 that prevent rattling in the locked state are provided. The seat rail device 10 also includes an operation unit (not shown) that is operated to switch between a locked state of the lower rails 20 and the upper rails 30 by the pair of locking members 70 and an unlocked state of releasing the locked state. ing. Hereinafter, each element constituting the seat rail device 10 will be described in detail with the longitudinal direction of the seat rail device 10 as the front-rear direction. 1 shows one lower rail 20 and upper rail 30, etc., and the other lower rail 20, upper rail 30, etc. are omitted for convenience.

The lower rail 20 is formed in an elongated rail shape, and as shown in FIGS. 22b. The guide portions 22a and 22b surround and guide a roller 61 and a side roller 62, which will be described later. 24 and a connecting surface 25 connecting the top surface 23 and the bottom surface 24 are formed. In addition, inner surface portions 26 extend downward from the end portions of the upper surface 23 of the guide portions 22a and 22b. Note that the top surface 23 and the bottom surface 24 can correspond to examples of the "first surface" and the "second surface".

A plurality of lock member fitting holes (not shown) for fitting with the lock pieces 71a of the lock member 70 are formed along the longitudinal direction in the inner surface portion 26 that continues to the guide portion 22a. In addition, a plurality of pressing member grooves (not shown) into which the pressing portion 81a of the rattling prevention member 80 can be inserted are formed along the longitudinal direction on the inner surface portion 26 that continues to the guide portion 22b.

The upper rail 30 includes a first upper rail 31 and a second upper rail 32 that are arranged as a left and right pair, and connecting portions 33 and 34 that are attached to the first upper rail 31 and the second upper rail 32 from the front-rear direction. configured to provide.

As shown in FIG. 2(A), the first upper rail 31 has a support portion 31a that is inserted into the guide portion 22a. 24 is rotatably supported at two points on the front side and the rear side. Similarly, the second upper rail 32 has a support portion 32a that is inserted into the guide portion 22b. A roller 61 is rotatably supported at two points on the front side and the rear side.

As shown in FIG. 4, a front side bracket 40a and a rear side bracket 50a for reinforcement are fixed by welding to the front side and rear side of the first upper rail 31, respectively. Similarly, a front side bracket 40b and a rear side bracket 50b for reinforcement are welded and fixed to the front side and rear side of the second upper rail 32, respectively.

Since the front side bracket 40a and the front side bracket 40b have symmetrical shapes as shown in FIG. 5, the detailed shape will be described with reference to FIGS. 2B and 6, taking the front side bracket 40a as an example.
As shown in FIGS. 2(B) and 6, the front bracket 40a has a fixing portion 41 welded and fixed to the front inner side of the first upper rail 31 and a support piece 42 whose tip side is inserted into the guide portion 22a. is formed so as to be continuous with The support piece 42 has a side roller 62 rotatably supported as a second roller that rolls and comes into contact with the connecting surface 25 of the guide portion 22a. In addition, the support piece 42 is formed with a narrow portion 42a between the fixed portion 41 and the position where the side roller 62 is supported, in order to facilitate elastic deformation of the tip side with respect to the fixed portion 41 side. .

Similarly, the front side bracket 40b includes a support piece 42 formed with a fixed portion 41 and a narrow portion 42a, and a side roller 62 rollingly contacting the connecting surface 25 of the guide portion 22b on the tip side of the support piece 42 is rotatable. is formed to be supported by

The side rollers 62 are assembled to the support pieces 42 so as to be pressed inwardly and in rolling contact with the connecting surface 25 by utilizing the elastic deformation of the support pieces 42 starting from the narrow portions 42a. That is, as shown in FIG. 7, the distance between the connecting surface 25 of the guide portion 22a and the connecting surface 25 of the guide portion 22b is the width of the lower rail W, and the outer surface of the side roller 62 of the front bracket 40a before rolling contact with the front bracket. The side rollers 62 are assembled to the support pieces 42 so that the roller pitch P is slightly longer than the lower rail width W, where the distance between the side rollers 62 of 40b and the outer surface of the side rollers 62 is a roller pitch P. Therefore, when the side roller 62 rolls and contacts the connection surface 25, the support piece 42 elastically deforms in the direction of arrow F in FIG. pressed against surface 25;

As shown in FIG. 8, the rear bracket 50a and the rear bracket 50b have symmetrical shapes, so the detailed shape will be described with reference to FIG. 9, taking the rear bracket 50a as an example.
The rear bracket 50a includes a first fixing portion 51 welded to the rear inner side of the first upper rail 31, a second fixing portion 52 welded to the rear outer side, the first fixing portion 51 and the second fixing portion. 52, and a support piece 54 whose distal end side is inserted into the guide portion 22a. Two openings 52 a for welding are formed in the second fixing portion 52 . The support piece 54 has a side roller 62 rotatably supported as a second roller that rolls and contacts the connection surface 25 of the guide portion 22a on the tip side thereof. The support piece 54 is formed with a narrow portion 54a between the connecting portion 53 and the position where the side roller 62 is supported, in order to facilitate elastic deformation of the tip side with respect to the connecting portion 53 side.

Similarly, the rear bracket 50b includes a first fixing portion 51, a second fixing portion 52, a connecting portion 53, and a support piece 54 having a narrow portion 54a. A side roller 62 rollingly contacting the connecting surface 25 of is rotatably supported.

The side rollers 62 of the rear bracket 50a and the rear bracket 50b are pressed inwardly against the connecting surface 25 by utilizing the elastic deformation of the support piece 54 starting from the narrow portion 54a so as to make rolling contact. It is attached to the support piece 54 . That is, like the side rollers 62 of the front bracket 40a and the front bracket 40b, the side rollers 62 of the rear bracket 50a and the rear bracket 50b are assembled to the support pieces 54 so that the roller pitch is slightly longer than the lower rail width. be done. Therefore, when the side roller 62 rolls and contacts the connection surface 25, the support piece 54 is elastically deformed starting from the narrow portion 54a in the same manner as the support piece 42, so that the side roller 62 is connected with an appropriate pressing force. pressed against surface 25;

The supporting portion 31a of the first upper rail 31 has two openings 31b to avoid interference with the side rollers 62 of the welded front bracket 40a and the welded side rollers 62 of the rear bracket 50a. is formed. Similarly, the support portion 32a of the second upper rail 32 has two openings to avoid interference with the side rollers 62 of the welded front bracket 40b and the welded rear bracket 50b. 32b are formed.

Further, the first upper rail 31 and the second upper rail 32 are provided with connecting pieces 31d to 31g and connecting pieces 32d to 32g, which come into surface contact when assembled using the connecting portions 33 and 34, respectively.

The connecting portion 33 includes a fixing portion 33a for fixing the vehicle seat, an engaging hole 33b into which the connecting pieces 31d and 32d in surface contact are fitted, and the connecting pieces 31e and 32e in surface contact. An engagement hole 33c for fitting is formed. The connecting portion 34 includes a fixing portion 34a for fixing the vehicle seat, an engaging hole 34b into which the connecting piece 31f and the connecting piece 32f that are in surface contact, and the connecting piece 31g and the connecting piece that are in surface contact. An engagement hole 34c into which 32g is fitted is formed.

As shown in FIG. 4, the lock member 70 is supported by a lock piece member 71 having a plurality of lock pieces 71a, a movable member 72 for moving the lock piece member 71, and the first upper rail 31 for locking. A fixing member 73 that rotatably supports the piece member 71 and the movable member 72 is provided. The lock member 70 functions to lock the lower rail 20 and the upper rail 30 in a non-slidable manner by fitting the lock pieces 71a into the lock member fitting holes when the operation portion is not operated. The lock member 70 rotates the movable member 72 in accordance with the operation of the operating portion, and the engagement between the lock pieces 71a and the lock member engagement holes is released, thereby moving the upper rail 30 to the lower rail 20. On the other hand, it functions so that it can be slid back and forth.

As shown in FIG. 4, the rattling prevention member 80 is a pressing member 81 that presses against the upper side of the pressing member groove of the lower rail 20 to prevent rattling, and the vertical position of this pressing member 81 is controlled. A pair of front and rear rotating plate members 82 and pivot members 83 that support the rotating plate members 82 so as to be rotatable with respect to the second upper rails 32 are provided. When the operation portion is not operated, the rattling prevention member 80 is configured such that the pressing portion 81a of the pressing member 81, which receives pressure from the rotating plate member 82, is strongly pressed against the pressing member groove. It functions to suppress rattling of 30. When the pressing member 81 is pushed down by the rotating plate member 82 in accordance with the operation of the operating portion, and the pressure on the pressing member groove is released, the rattling prevention member 80 maintains the lower rail in a slidable state. It functions to release the rattling suppression of the upper rail 30 with respect to 20 .

Next, the manufacturing process of the seat rail device 10 will be described.
First, as shown in FIG. 4, the front bracket 40a and the rear bracket 50a are welded to the first upper rail 31, and the front bracket 40b and the rear bracket 50b are welded to the second upper rail 32. do. This welding is for increasing the rigidity of the upper rail 30. Specifically, the front side bracket 40a to which the side roller 62 is assembled is spot-welded or the like to the front inner side of the first upper rail 31 at the fixing portion 41. The front bracket 40b to which the side rollers 62 are assembled is welded and fixed to the front inner side of the second upper rail 32 at the fixing portion 41 using spot welding or the like. In addition, the rear bracket 50a to which the side roller 62 is assembled has the first fixing portion 51 spot-welded to the rear inner side of the first upper rail 31, and the second fixing portion 52 to the rear outer side of the first upper rail 31. It is welded and fixed to the first upper rail 31 by welding using the two openings 52a. The rear bracket 50b to which the side rollers 62 are assembled has the first fixing portion 51 spot-welded to the rear inner side of the second upper rail 32, and the second fixing portion 52 to the rear outer side of the second upper rail 32. It is welded and fixed to the second upper rail 32 by welding using the two openings 52a.

Thereafter, the two rollers 61 and the lock member 70 are assembled to the first upper rail 31 to which the front bracket 40a and the rear bracket 50a are welded, and the front bracket 40b and the rear bracket 50b are welded and fixed. Two rollers 61 and an anti-rattle member 80 are assembled to the second upper rail 32 .

Then, the connecting pieces 31d to 31g of the first upper rail 31 to which the locking member 70 and the like are assembled and the connecting pieces 32d to 32g of the second upper rail 32 to which the anti-rattle member 80 and the like are assembled are brought into surface contact. In this state, the connecting portion 33 and the connecting portion 34 are assembled. A connecting piece 31d and a connecting piece 32d projecting from the engaging hole 33b, a connecting piece 31e and a connecting piece 32e projecting from the engaging hole 33c, a connecting piece 31f and a connecting piece 32f projecting from the engaging hole 34b, and projecting from the engaging hole 34c. The connecting piece 31g and the connecting piece 32g are respectively welded (see the hatched area in FIG. 3).

As a result, as shown in FIG. 3, the upper rail 30 is assembled with the brackets 40a, 40b, 50a, 50b, the locking member 70, the rattling prevention member 80, and the like. In this state, the rollers 61 and the side rollers 62 are assembled so as to be guided by the guide portions 22a and 22b of the lower rails 20, whereby the assembly of the upper rails 30 to the lower rails 20 is completed.

In the seat rail device 10 configured as described above, the rollers 61 are in rolling contact with either one of the upper surface 23 and the bottom surface 24 at two locations in the front-rear direction of the guide portion 22a, and at two locations in the front-rear direction of the guide portion 22b. The roller 61 is in rolling contact with either one of the top surface 23 and the bottom surface 24 . Further, the side rollers 62 are in rolling contact with the connecting surface 25 at two locations in the front-rear direction of the guide portion 22a, and the side rollers 62 are in rolling contact with the connecting surface 25 at two locations in the front-rear direction of the guide portion 22b. Such rolling contact suppresses looseness during sliding while realizing a low sliding load during sliding.

As described above, in the seat rail device 10 according to the present embodiment, the rollers 61 supported by the upper rails 30 are guided by the guide portions 22a and 22b provided on the lower rails 20, so that the upper rails 30 are aligned with the lower rails 20. The guide portions 22a and 22b are slidably assembled to each other, and the top surface 23 and the bottom surface 24 are connected to the top surface 23 and the bottom surface 24, which are arranged to face each other and contact one of them when the roller 61 rolls and contacts. A connecting surface 25 is formed. Front side brackets 40a and 40b and rear side brackets 50a and 50b are provided which are fixed to the upper rail 30 and support side rollers 62 guided by the guide portions 22a and 22b. It is supported by the support pieces 42 and 54 that enter into the portions 22a and 22b and comes into rolling contact with the connecting surface 25. As shown in FIG.

As a result, the rollers 61 are in rolling contact with one of the top surfaces 23 and bottom surfaces 24 of the guide portions 22a and 22b, and the side rollers 62 are in rolling contact with the connecting surfaces 25 of the guide portions 22a and 22b. While realizing a low sliding load, rattling during sliding can be suppressed. In particular, since the side rollers 62 are supported by the upper rails 30 via the brackets 40a, 40b, 50a, 50b, there is no need to cut down a part of the upper rails 30, so that the rigidity of the upper rails 30 is reduced. do not have. Therefore, rattling can be suppressed and the slide load can be reduced without lowering the rigidity of the upper rail 30 .

In particular, the support piece 42 has a narrow portion 42a between the position where it is welded to the upper rail 30 and the position where the side roller 62 is supported, and the support piece 54 is welded and fixed to the upper rail 30. A narrow portion 54a is formed between the position where the side roller 62 is supported and the position where the side roller 62 is supported. Therefore, when the side roller 62 rolls into contact with the connection surface 25 of the guide portions 22a, 22b, the support pieces 42, 54 are likely to be elastically deformed starting from the narrow portions 42a, 54a. 25 is not pressed more than necessary. This makes it possible to further reduce the slide load.

[Other embodiments]
It should be noted that the present invention is not limited to the above embodiments and the like, and may be embodied as follows, for example.
(1) The configuration for supporting the side rollers 62 is not limited to the use of a pair of front brackets 40a and 40b, and a reinforcing bracket that integrates the front brackets 40a and 40b may be used. For example, as a first modified example of the present embodiment, two support pieces 42 each supporting a side roller 62 on the tip side of a narrow portion 42a, like a reinforcing bracket 40c shown in FIG. A reinforcing bracket including one fixing portion 44 that is welded and fixed to both the upper rail 31 and the second upper rail 32 may be employed. Further, for example, as a second modification of the present embodiment, a reinforcing bracket having a narrow portion 42a longer than the reinforcing bracket 40c, such as a reinforcing bracket 40d shown in FIG. 11, is adopted. may be Similarly, the configuration for supporting the side rollers 62 is not limited to the use of a pair of the rear brackets 50a and 50b. An integral reinforcing bracket may be employed.

(2) The side roller 62 is not limited to one provided for one bracket like the front side bracket 40a and the front side bracket 40b, and a plurality of side rollers 62 may be provided for one bracket. Similarly, the side roller 62 is not limited to one provided for one bracket as in the rear bracket 50a and the rear bracket 50b, and a plurality of side rollers 62 may be provided for one bracket.

DESCRIPTION OF SYMBOLS 10... Seat rail apparatus 20... Lower rail 22a, 22b... Guide part 23... Upper surface (1st surface)
24 ... bottom surface (second surface)
25... Connection surface 30... Upper rail 31... First upper rail 32... Second upper rail 40a, 40b... Front side bracket (bracket)
40c, 40d... Bracket 42... Support piece 50a, 50b... Rear side bracket (bracket)
54... Support piece 61... Roller 62... Side roller (second roller)

Claims (1)

It has a lower rail fixed to the vehicle body and an upper rail fixed to the seat, and rollers supported by the upper rail are guided by guides provided on the lower rail so that the upper rail is moved with respect to the lower rail. A seat rail device assembled in a slidable manner,
a bracket fixed to the upper rail and supporting a second roller guided by the guide part;
The guide portion has a first surface and a second surface which are arranged to face each other and which come into contact with one of the rollers when the rollers are in rolling contact, and a connecting surface which connects the first surface and the second surface. formed,
The bracket includes a fixed portion that is welded and fixed to the upper rail and a support piece that extends substantially perpendicularly to the fixed portion,
The second roller is supported by the support piece inserted into the guide portion and is in rolling contact with the connecting surface,
The support piece has a narrow portion formed between the fixed portion and a position where the second roller is supported, and the position where the second roller is supported is a sliding direction with respect to the narrow portion. A seat rail device , wherein the seat rail device is set with a deviation in a direction away from the fixed portion .

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