JP2008105542A - Driving mechanism of vehicular power seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving mechanism of a vehicular power seat which can achieve a driving mechanism for inclining a tilt pan or for rising and falling at least one of the front end part and the rear end part of a seat part by a simple structure with a few components. <P>SOLUTION: The driving mechanism comprises: a nut 26 supported at the seat part 14 incapable of relatively moving in an axial direction, but capable of rotating around an axial line; a male screw 33 screwed in the nut whose rotation around the axial line is regulated; a rotational driving means M for rotationally driving the nut around the axial line; and a link member 37 whose both ends are rotatably pivoted by the tilt pan 20 and the male screw. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drive mechanism for a vehicle power seat capable of rotating a tilt pan provided in a seat or raising and lowering a front end and a rear end of the seat.

Conventionally, various types of power seats for vehicles that can rotate a tilt pan provided at the front end of the seat or raise and lower the front and rear ends of the seat have been proposed.
Patent Document 1 discloses a vehicle power seat capable of moving up and down the front end portion and the rear end portion of a seat portion. The seat portion of the power seat is supported on the vehicle floor via a slide rail device. A drive mechanism for raising and lowering the front end of the seat is provided between the front end of the seat and the front end of the upper rail of the slide rail device, and the rear end of the seat and the rear of the upper rail. A driving mechanism for raising and lowering the rear end portion of the seat portion is provided between the end portions. Therefore, when the motors built in the front and rear drive mechanisms are driven, the front and rear drive mechanisms operate, and the front end portion and the rear end portion of the seat portion are raised and lowered with respect to the upper rail (vehicle floor surface).
JP 2005-28955 A

The drive mechanism before and after the power seat disclosed in Patent Document 1 utilizes a link mechanism.
However, these drive mechanisms are complex structures with a large number of link members and number of nodes constituting the link mechanism. For this reason, the manufacturing cost is high, and if the manufacturing accuracy of each component member is reduced even a little, the drive mechanism becomes difficult to move, and there is a risk of causing play or performance degradation.

  An object of the present invention is to provide a drive mechanism for a vehicle power seat that can realize a drive mechanism for tilting a tilt pan or raising / lowering at least one of a front end portion and a rear end portion of a seat portion with a simple structure having few components. It is to provide.

  The power seat drive mechanism for a vehicle according to the present invention includes a power seat in which a rear end portion of a tilt pan is attached to a front portion of a seat portion supported on a vehicle floor so as to be rotatable about a rotation axis in the width direction of the seat portion. The power seat has a drive mechanism for the tilt pan, and the drive mechanism is supported by one of the seat portion and the tilt pan so that it cannot move in the axial direction of itself and can rotate around the axis. A member, a non-rotating member screwed into the rotating member so as to be movable in the axial direction in a state in which the rotation around the axis of the member is restricted, and a rotation driving means for driving the rotating member to rotate about the axis And a non-rotating member, and a link member pivotally attached to the other of the seat portion and the tilt pan so that both end portions thereof are swingable about a swing shaft parallel to the rotation shaft. Features

  According to another aspect, the vehicle power seat drive mechanism of the present invention is a power seat capable of moving up and down at least one of a front end portion and a rear end portion of a seat portion supported by a support member provided on a vehicle floor surface. The seat has a drive mechanism that raises and lowers at least one of the front end portion and the rear end portion of the seat portion, and the drive mechanism cannot move in the axial direction of one of the seat portion and the support member. A rotating member supported so as to be capable of rotating about the axis, a non-rotating member which is screwed to the rotating member so as to be movable in the axial direction in a state in which the rotation around the axis is restricted, and the rotation Both ends of the rotational drive means for rotationally driving the member around the axis, the other of the seat portion and the support member, and the non-rotating member swing around a swing shaft in the width direction of the seat portion. Each link member pivoted as possible, It is characterized in that it comprises.

  The link mechanism constituting the main part of the drive mechanism of the present invention is composed of two members, a non-rotating member and a link member, and the number of nodes is only two. Thus, since the structure is extremely simple compared to the conventional case, the manufacturing cost can be kept low. Furthermore, since there are few components, even if the manufacturing accuracy of each component is somewhat low, there is an advantage that the operation accuracy of the drive mechanism is not significantly reduced.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, the overall structure of the power seat 10 will be described with reference to FIG.
A pair of left and right slide rails 11 extending in the vehicle longitudinal direction (front-rear direction) are provided on a floor surface FL in the vehicle. Each of the left and right slide rails 11 includes a lower rail 12 fixed to the floor surface FL, and an upper rail (support member) 13 slidably supported on the lower rail 12.
Metal seat cushion frames (seat portions) 14 are fixed to the upper surfaces of the left and right upper rails 13, respectively, and the inner side surfaces of the left and right seat cushion frames 14 are a plurality of metal connecting members (not shown). It is connected. An upward connection end portion 15 is formed at the rear end portions of the left and right seat cushion frames 14, and a lower end portion of a metal seat back frame 16 is located between the left and right connection end portions 15. Yes. The left and right connection end portions 15 and the lower end portions of the seat back frame 16 are connected by a rotation connecting shaft 17 extending in the vehicle width direction so as to be relatively rotatable around the rotation connecting shaft 17.
The left and right seat cushion frames 14 and the connecting member are covered with a seat cushion (seat portion) 18 made of a flexible material capable of elastic deformation, and the seat back frame 16 is a seat back cushion 19 made of a flexible material capable of elastic deformation. Covered by.

Next, the tilt pan 20 and the drive mechanism DM will be described with reference to FIGS.
A downward folded piece 21 is formed at the front end of the tilt pan 20 which is a metal plate member. Further, downward-facing connecting protrusions 22 and supporting protrusions 23 are provided in the vicinity of the front end and the rear end of the left and right side edges of the tilt pan 20, respectively. The left and right support protrusions 23 face the outer surfaces of the left and right seat cushion frames 14. The left support protrusion 23 and the left seat cushion frame 14, and the right support protrusion 23 and the right seat cushion frame 14 are rotatably connected by a rotation shaft 24 that extends in the vehicle width direction.

A pair of front and rear bearings 25 are provided in the vicinity of the front end portions of the outer side surfaces of the left and right seat cushion frames 14, and a nut (rotating member) 26 is rotatable between the front and rear bearings 25 about its axis and in the axial direction. Is supported as a relative immobility. The nut 26 includes a female screw hole 27 (see FIG. 4) penetrating the nut 26 in the axial direction, and a gear 28 formed on the outer peripheral surface.
A main body of a motor (rotation drive means) M is fixed to the inner side surfaces of the left and right seat cushion frames 14. The distal end portion of the rotation output shaft M1 protruding from the end face of the motor M facing the seat cushion frame 14 passes through a through hole (not shown) of the seat cushion frame 14. Further, a worm 30 that meshes with the gear 28 of the nut 26 is fixed to the tip portion.
A feed screw (non-rotating member) 33 is fitted in the female screw hole 27 of the nut 26, and a male screw 34 formed on the outer peripheral surface of the feed screw 33 is screwed into the female screw hole 27. Further, the vicinity of both front and rear ends of the feed screw 33 is slidably supported by a pair of front and rear bearings 35 protruding from the seat cushion frame 14.
A rocking shaft 36 that protrudes in the vehicle width direction protrudes from the front end portion of the feed screw 33, and an engagement hole 38 formed in one end of a link member 37 can rock on the rocking shaft 36. It is mated. Further, an engagement hole 39 is formed in the other end portion of the link member 37, and the engagement hole 39 swings on a swing shaft 40 projecting from the connection projecting piece 22 and extending in the vehicle width direction. It is movably fitted. The link member 37 can only swing about the swing shaft 36 and swing about the swing shaft 40, and cannot rotate about the longitudinal direction of the link member 37, so the link member 37 is linked by the swing shaft 36 and the engagement hole 38. The rotation around the axis of the feed screw 33 linked to the member 37 is restricted.
The nut 26, the motor M, the feed screw 33, and the link member 37 are components of the drive mechanism DM.

Next, the operation of the power seat 10 configured as described above will be described.
FIG. 2 shows a state in which the tilt pan 20 is located at a substantially horizontal initial position. When the tilt switch S (see FIG. 1) provided on the power seat 10 is pushed in the UP direction (backward) from the initial position in this state, the motor M continues to rotate normally while the tilt switch S is being pushed. Then, the worm 30 rotates forward and the rotational force of the worm 30 is transmitted to the gear 28 of the nut 26, so that the gear 28 (nut 26) rotates about its axis. Then, the feed screw 33 slides forward with respect to the nut 26 and the seat cushion frame 14 in accordance with the screwing relationship between the female screw hole 27 and the male screw 34, and the link member 37 and the tilt pan 20 are inclined with respect to the floor surface FL as shown in FIG. The angle increases. Therefore, the front end portion of the seat cushion 18 is lifted as shown in FIG.
When the hand is released from the tilt switch S, the tilt switch S returns to the initial position by the biasing force of the biasing means built in the tilt switch S, and the motor M stops rotating.
On the other hand, when the tilt switch S is pushed in the DOWN direction opposite to the UP direction with respect to the initial position (forward), the motor M continues to reverse while the tilt switch is being pushed. Slide backward with respect to the cushion frame 14. Then, since the inclination angle with respect to the floor surface FL of the link member 37 and the tilt pan 20 becomes small, the front end part of the seat cushion 18 descends.

  As described above, the main part of the drive mechanism DM according to the present embodiment is constituted by a link mechanism having only two nodes, the feed screw 33 and the link member 37 slidably supported by the seat cushion frame 14. Has been. Therefore, the structure is simpler than the driving mechanism in the conventional power seat, and the manufacturing cost can be kept low. Furthermore, since the number of parts is small, even if the manufacturing accuracy of each part is somewhat low, the operation accuracy of the drive mechanism DM is not significantly reduced.

FIG. 5 shows a first modification.
In this modification, the tilt pan 20 is not provided, and instead, between the front end portions of the left and right seat cushion frames 14 and the front end portions of the upper rails 13 and between the rear end portions of the seat cushion frames 14 and the rear end portions of the upper rails 13. In total, four drive mechanisms DM are provided. Specifically, support pieces 41 project from both front and rear end portions of the upper surfaces of the left and right upper rails 13, and a nut 26 is rotatably supported between a pair of bearings 25 projecting from each support piece 41. A pair of front and rear bearings 35 projecting from the piece 41 slidably supports the feed screw 33 screwed into the female screw hole 27 of the nut 26, and a motor M is attached to the inner surface of the support piece 41 (the worm 30 is attached to the nut 26. The feed screw 33 and the link member 37 are rotatably connected by the swing shaft 36 and the engagement hole 38, and the engagement hole 39 of the link member 37 is protruded from the seat cushion frame 14. The swing shaft 42 is rotatably connected.
The power seat 10 is provided with a tilt switch S (not shown) for the front drive mechanism DM and a tilt switch S (not shown) for the rear drive mechanism DM, and the tilt switch S for the front drive mechanism DM is provided. By operating S and the tilt switch S for the rear drive mechanism DM, the front end portion and the rear end portion of the seat cushion frame 14 can be moved up and down independently (see the phantom line in FIG. 5). ).
The front drive mechanism DM and the rear drive mechanism DM may be operated by a single tilt switch S. In this case, when the single tilt switch S is operated to the UP side or the DOWN side, the front and rear drive mechanisms DM operate in synchronization, and the front end portion and the rear end portion of the seat cushion frame 14 always have the same distance in the same direction. Therefore, the seat cushion frame 14 (seat cushion 18) moves up and down while maintaining the inclination angle.

FIG. 6 shows a second modification.
In this modification, the front end portion of the seat cushion frame 14 and the front support piece 41 are connected by the drive mechanism DM having the same configuration as in FIG. 5, and the rotation axis is connected to the rear end portion of the seat cushion frame 14 and the rear support piece 43. Both end portions of the link member 46 are rotatably connected using the shaft 44 and the rotating shaft 45. In this modification, when the front drive mechanism DM is operated by operating the tilt switch S, the tilt angle of the link member 37 and the tilt angle of the link member 46 change simultaneously, so that the vertical position of the entire seat cushion frame 14 changes. At the same time, the inclination angle of the seat cushion frame 14 changes.

FIG. 7 shows a third modification.
In this modified example, the rear end portion of the seat cushion frame 14 and the rear support piece 41 are connected by the drive mechanism DM mechanism having the same configuration as in FIG. 5, and the seat cushion frame 14 rotates to the front end portion and the front support piece 43. Both ends of the link member 46 are rotatably connected using a shaft 44 and a rotating shaft 45. In this modification, when the rear drive mechanism DM is operated by operating the tilt switch S, the inclination angle of the link member 37 and the inclination angle of the link member 46 change simultaneously, so that the vertical position of the seat cushion frame 14 as a whole is changed. At the same time, the inclination angle of the seat cushion frame 14 changes.
In the first modification, the rotation range of any one of the rocking shaft 36 and the rocking shaft 42 is restricted within a predetermined range by a rotation range restricting means (not shown). And in the third modification, the rotation range of any one of the swing shaft 36, the swing shaft 42, the rotary shaft 44, and the rotary shaft 45 is within a predetermined range by a rotation range restriction means (not shown). It is regulated. Therefore, in any of the modifications, the seat cushion frame 14 is not greatly inclined and abuts against the floor surface FL when sitting. Instead of providing the rotation range restricting means, any one of the swing shaft 36 and the swing shaft 42 is fixed in a non-rotatable manner in the first modification, and any one of the second and third modifications. The rocking shaft 36, the rocking shaft 42, the rotating shaft 44, and the rotating shaft 45 may be fixed so as not to rotate.

FIG. 8 shows a fourth modification.
The basic structure of this modification is the same as that of the embodiment shown in FIGS. 1 to 4, but a bearing 25, a nut 26, and a motor M are provided on the inner side of the seat cushion frame 14, and the front end portion of the seat cushion frame 14 A guide long hole 48 extending in the front-rear direction is formed in the front end of the seat cushion frame 14 through the guide long hole 48. The point from which the engagement hole 38 of the link member 37 is rotatably engaged with the part differs from the embodiment shown in FIGS.
In this modification, the rocking shaft 36 of the feed screw 33 is supported and guided by the guide slot 48, so that the feed screw 33 moves back and forth more smoothly than in the embodiment shown in FIGS. Therefore, it is possible to operate the drive mechanism DM more smoothly than in the embodiment shown in FIGS. Further, since the swing shaft 36 is supported and guided by the guide elongated hole 48, the front and rear bearings 35 that existed in the above-described embodiment and the modification can be omitted.
Although not shown, a guide slot 48 is formed in the support piece 41 of FIGS. 5 to 7, and the swing shaft 36 of the feed screw 33 is passed through the guide slot 48 on one side surface of the support piece 41. The engaging hole 38 of the link member 37 may be rotatably engaged with the protruding portion of the swing shaft 36 by projecting from the side to the opposite side surface.

As mentioned above, although one Embodiment and each modification of this invention were demonstrated using FIGS. 1-8, the technical scope of this invention is not limited to these, Furthermore, it can implement with various changes. It is.
For example, in the embodiment and the fourth modification of FIGS. 1 to 4, the feed screw 33 is supported on the seat cushion frame 14 side so as not to be slidable (rotatable) in the axial direction. 27 may be slidably fitted (non-rotatable), and the engaging hole 38 of the link member 37 may be swingably connected to the swing shaft 36 protruding from the nut 26.
Further, in the embodiment and the fourth modification of FIGS. 1 to 4, a nut 26, a feed screw 33, a motor M, and the like are provided on the connection projecting piece 22 side, and a link member 37 is connected to the feed screw 33 and the seat cushion frame 14. It is also possible to carry out by connecting both end portions of the swayable to be swingable.

Further, in the first to third modifications, the feed screw 33 is supported on the support piece 41 side so as not to be slidable (rotatable), and the female screw hole 27 of the nut 26 is slidable (unrotatable) to the feed screw 33. The engaging hole 38 of the link member 37 may be swingably connected to the swinging shaft 36 that is fitted and protrudes from the nut 26.
Further, in the first to third modifications, a nut 26, a feed screw 33, a motor M, etc. are provided on the seat cushion frame 14 side, and both end portions of the link member 37 can swing between the feed screw 33 and the support piece 41. You may carry out by connecting to.

  Further, in the first to third modifications, the lower end side of the drive mechanism DM is swingably connected to the support piece 41 of the upper rail 13 of the slide rail 11, but the slide rail 11 is omitted and the drive mechanism is omitted. The lower end side of the DM may be swingably connected to a support member (for example, a bracket projecting from the floor surface FL) provided on the floor surface FL.

It is a side view of the power seat of one embodiment of the present invention. It is a side view of the seat part in an initial state. It is a side view of a seat part when raising a tilt pan. It is an enlarged side view of a tilt pan, a drive mechanism, and its peripheral part. It is the side view which abbreviate | omitted the seat cushion of the seat part of the 1st modification. It is the side view which abbreviate | omitted the seat cushion of the seat part of the 2nd modification. It is the side view which abbreviate | omitted the seat cushion of the seat part of the 3rd modification. It is a side view of the seat part of a 4th modification.

Explanation of symbols

10 Power seat 11 Slide rail 12 Lower rail 13 Upper rail (support member)
14 Seat cushion frame (seat)
15 Connecting projection 16 Seat back frame 17 Rotating connecting shaft 18 Seat cushion (seat)
19 Seat back cushion 20 Tilt pan 21 Folding piece 22 Projection piece 23 Connection projection piece 24 Rotating shaft 25 Bearing 26 Nut (rotating member)
27 Female thread hole 28 Gear 30 Worm 33 Feed screw (non-rotating member)
34 Male screw 35 Bearing 36 Oscillating shaft 37 Link member 38 39 Engagement hole 40 Oscillating shaft 41 Support piece 42 Oscillating shaft 44 45 Rotating shaft 46 Link member 48 Guide long hole DM Drive mechanism M Motor (rotation drive means)
M1 Rotation output shaft S Tilt switch

Claims (2)

In the power seat attached to the front part of the seat part supported on the vehicle floor so that the rear end part of the tilt pan is rotatable around the rotational axis in the width direction of the seat part,
The power seat has a tilt pan drive mechanism,
A rotating member supported on one of the seat part and the tilt pan so as not to move in the axial direction of the seat part and to be rotatable around the axial line;
A non-rotating member that is screwed into the rotating member so as to be able to move in the axial direction in a state in which the rotation around its own axis is restricted;
Rotation drive means for rotating the rotation member around the axis;
The non-rotating member, and a link member pivotally attached to the other of the seat portion and the tilt pan so that both end portions thereof are swingable about a swing shaft parallel to the rotation shaft. A drive mechanism for a vehicle power seat. In the power seat capable of raising and lowering at least one of the front end portion and the rear end portion of the seat portion supported by the support member provided on the vehicle floor surface,
The power seat has a drive mechanism that raises and lowers at least one of the front end portion and the rear end portion of the seat portion, and the drive mechanism includes:
A rotating member supported on one of the seat and the support member so as not to move in the axial direction of the seat and to be rotatable around the axis;
A non-rotating member that is screwed into the rotating member so as to be able to move in the axial direction in a state in which the rotation around its own axis is restricted;
Rotation drive means for rotating the rotation member around the axis;
Link members each having both ends pivotably attached to the other of the seat part and the support member and the non-rotating member so as to be swingable about a swing axis in the width direction of the seat part. A drive mechanism for a vehicle power seat.

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