JP6586881B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat provided with a height adjusting mechanism.

In a vehicle seat, as a mechanism for adjusting the height of the seat cushion, a link that is rotatably connected to the seat cushion and the slide rail, the length of the telescopic direction is changed by the motor and the operation of the motor, and the link is changed. One having a lead screw for transmitting power is known.
For example, a seat lifter described in Patent Document 1 includes a long link (hereinafter referred to as a rear link), a lead screw that is connected to the rear link and expands and contracts in the front-rear direction by driving a motor, and a front link (hereinafter referred to as a rear link). A front link).

JP 2005-238879 A

  Incidentally, the housing surrounding the speed reduction mechanism connected to the motor of Patent Document 1 is connected to the rear link via a lead screw. To increase the rigidity against the load applied to the deceleration mechanism in the housing via the lead screw added to the rear link, so that the seat cushion height can be adjusted stably even when an impact load such as a rear impact is applied. Was necessary.

  Moreover, the speed reduction mechanism connected to the motor of Patent Document 1 is covered with a housing and a bracket, and these are fastened by bolts and nuts. When foreign matter enters between the bolt / nut and the housing or the bracket, rattling occurs, and abnormal noise may occur depending on the operation of the motor.

  The housing that covers the reduction mechanism of Patent Document 1 is attached to the seat cushion frame by a bolt via a bracket. For this reason, it is necessary to prepare a bolt for attaching the housing to the seat cushion frame, and to form a hole for passing the bolt through the seat cushion frame.

  Further, since the housing and the motor of Patent Document 1 are linearly attached to the seat cushion frame via the bracket in the seat width direction, the overhang from the seat cushion frame obstructs the handling of the harness and the like. Was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat capable of stably adjusting the height of a seat cushion.
Another object of the present invention is to prevent foreign matter from entering the vicinity of an attachment member for attaching the first housing portion and the second housing portion surrounding the speed reduction mechanism.
Another object of the present invention is to provide a vehicle seat with a housing, thereby reducing the number of parts and eliminating the need for additional machining.
Another object of the present invention is to arrange a housing or the like in a compact manner.

According to the vehicle seat of the present invention, the subject is a base member, a link member that is rotatably attached to the base member, and includes a first link and a second link , and the link. A seat cushion frame that is pivotally connected to the member and moves up and down in accordance with the pivoting of the link member; and a connecting member that is pivotally coupled to one of the first link or the second link ; A vehicle seat provided with a drive unit for rotating the link member, wherein the drive unit includes a motor, a speed reduction mechanism coupled to the motor, the speed reduction mechanism and the first link or the second. It has the other connected to a lead screw of the link, wherein the vehicle seat comprises further a housing enclosing the speed reduction mechanism, a part of the said coupling member housing is integrally formed, The housing is composed of a first housing part and a second housing part having higher rigidity than the first housing part, and the connecting member is formed with a recessed portion extending, The housing part is solved by being arranged on the extension in the extending direction of the concave part .

According to the above configuration, since the connecting member and a part of the housing are integrally formed, the rigidity of the housing surrounding the speed reduction mechanism can be increased, and the height of the seat cushion can be adjusted stably. It becomes.
Further, according to the above configuration, the recess is formed in the connecting member, and the first housing portion having low rigidity is arranged on the extension in the extending direction of the recess, so that the vicinity of the housing surrounding the speed reduction mechanism The rigidity of can be increased.
According to the above configuration, in the configuration in which the link member includes the first link and the second link, the connecting member is rotatably connected to one of the first link or the second link, and the lead screw is connected to the first link or the second link. The housing is connected to the other of the second links, and the housing is formed integrally with the link member. For this reason, it is not necessary to fix a connection member, a lead screw, and a housing to a seat cushion frame, it is not necessary to provide the attachment member, and the process for the attachment is not required.

Moreover, the said subject is attached so that rotation with respect to the base member and this base member is comprised , and the link member comprised from the 1st link and the 2nd link is rotatably connected to this link member, A seat cushion frame that moves up and down according to the rotation of the link member, a connecting member that is rotatably connected to one of the first link or the second link, and a drive unit that rotates the link member. The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the other of the speed reduction mechanism and the first link or the second link. And the vehicle seat further includes a housing that surrounds the speed reduction mechanism, wherein the connecting member and a part of the housing are integrally formed, and the housing includes a first housing. The connecting member is formed with a recessed portion, and the second housing portion includes a first vertical wall, a second vertical wall, and the second housing portion. A connecting wall connecting the first vertical wall and the second vertical wall, wherein the connecting member includes an extending portion extending in the front-rear direction of the seat, and the extending portion of the first vertical wall and the connecting member; This is also solved by the fact that a flange is integrally formed at the upper end of each.

Moreover, the said subject is attached so that rotation with respect to the base member and this base member is comprised , and the link member comprised from the 1st link and the 2nd link is rotatably connected to this link member, A seat cushion frame that moves up and down according to the rotation of the link member, a connecting member that is rotatably connected to one of the first link or the second link, and a drive unit that rotates the link member. The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the other of the speed reduction mechanism and the first link or the second link. And the vehicle seat further includes a housing that surrounds the speed reduction mechanism, wherein the connecting member and a part of the housing are integrally formed, and the housing includes a first housing. The connecting member is formed by extending a recess, and the second housing part includes a first vertical wall, and the connecting member includes: An extension portion extending in the front-rear direction of the seat is provided, a flange is formed at an upper end portion of the first vertical wall, and the first housing portion and the second housing portion are attached by an attachment member. The mounting member is also solved by covering the upper part with the flange.
According to the above configuration, the second housing portion has the first vertical wall, the second vertical wall, and the connecting wall to be connected, and the flange is integrated with the upper ends of the first vertical wall and the connecting member. Therefore, the rigidity of the second housing part can be increased.

Moreover, the said subject is attached so that rotation with respect to the base member and this base member is comprised, and the link member comprised from the 1st link and the 2nd link is rotatably connected to this link member, A vehicle seat comprising: a seat cushion frame that moves up and down in accordance with the rotation of the link member; a connecting member that is rotatably connected to the second link; and a drive unit that rotates the link member. The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the speed reduction mechanism and the first link , and the vehicle seat includes the speed reduction mechanism. A housing surrounding the mechanism, wherein the connecting member and a part of the housing are integrally formed, and the link member is provided in both the sheet width direction and in the sheet width direction; While with the first link and the second link are arranged one behind the that, the disposed back and forth in the other in the sheet width direction, corresponding to the third link and the second link corresponding to the first link A vehicle, wherein the vehicle seat includes a hollow member that connects the fourth link and the second link, and a torsion bar that biases the second link or the fourth link upward. The hollow member further includes a torsion bar support portion that supports the torsion bar, and the housing is disposed on an extension of the torsion bar support portion in the seat front-rear direction. Solved.
According to the above configuration, in the configuration in which the link member includes the first link and the second link, the connecting member is rotatably connected to one of the first link or the second link, and the lead screw is connected to the first link or the second link. The other of the two links is connected, and the housing is formed integrally with the link member. For this reason, it is not necessary to fix a connection member, a lead screw, and a housing to a seat cushion frame, it is not necessary to provide the attachment member, and the process for the attachment is not required.
Moreover, according to the said structure, a housing will be arrange | positioned compactly by arrange | positioning on the seat front-back direction extension of a torsion bar support part.

Moreover, the said subject is attached so that rotation with respect to the base member and this base member is comprised , and the link member comprised from the 1st link and the 2nd link is rotatably connected to this link member, A vehicle seat comprising: a seat cushion frame that moves up and down in accordance with the rotation of the link member; a connecting member that is rotatably connected to the second link; and a drive unit that rotates the link member. The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the speed reduction mechanism and the first link, and the vehicle seat includes the speed reduction mechanism. A housing surrounding the mechanism, wherein the connecting member and a part of the housing are integrally formed, and an outer end of the first link in the sheet width direction is outside of the second link in the sheet width direction; The housing and the lead screw are provided on the inner side in the sheet width direction with respect to the second link, and the lead screw attached to the first link is located on the inner side in the sheet width direction with respect to the second link. It is also solved by the provision of the part.
According to the above configuration, the lead screw can be easily attached to the first link at a compact position while avoiding interference in the seat width direction between the housing and the lead screw and each link.

Moreover, the said subject is attached so that rotation with respect to the base member and this base member is comprised, and the link member comprised from the 1st link and the 2nd link is rotatably connected to this link member, A vehicle seat comprising: a seat cushion frame that moves up and down in accordance with the rotation of the link member; a connecting member that is rotatably connected to the second link; and a drive unit that rotates the link member. The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the speed reduction mechanism and the first link , and the vehicle seat includes the speed reduction mechanism. A housing surrounding the mechanism, wherein the connecting member and a part of the housing are integrally formed; the connecting member includes an extending portion extending in a seat front-rear direction; and the extending portion is a seat Also solved by being disposed between the lead screw and the second link in the direction.
According to the said structure, the enlargement of a height adjustment mechanism can be suppressed because the connection member is arrange | positioned between the 2nd link and the lead screw in the sheet | seat width direction.

The housing includes a first housing part and a second housing part. The second housing part includes a first vertical wall, a second vertical wall, and the first vertical wall and the second vertical wall. A connecting wall connecting the walls, the connecting member including an extending portion extending in the seat front-rear direction, and a flange at each upper end portion of the first vertical wall and the extending portion of the connecting member; Are preferably formed integrally .

In addition, the connecting member is rotatably connected to the second link, and the lead screw is connected to the speed reduction mechanism and the first link, and the outer side of the first link in the seat width direction is connected to the second link. The end is provided on the outer side in the seat width direction with respect to the second link, the housing and the lead screw are provided on the inner side in the seat width direction with respect to the second link, and the first link includes the first link It is preferable that a lead screw mounting portion located on the inner side in the sheet width direction than the two links is provided.
According to the above configuration, the lead screw can be easily attached to the first link at a compact position while avoiding interference in the seat width direction between the housing and the lead screw and each link.

Further, it is preferable that the lead screw mounting portion is located on the inner side in the seat width direction than the end portion on the outer side in the seat width direction of the housing.
According to the above configuration, since the lead screw mounting portion is on the inner side in the seat width direction than the end portion on the outer side in the seat width direction of the housing, it is possible to suppress an increase in size of the height adjusting mechanism.

According to the present invention, the height of the seat cushion can be stably adjusted.
Further, according to the present invention, the rigidity in the vicinity of the housing surrounding the speed reduction mechanism can be increased.
Moreover, according to this invention, the rigidity of a 2nd housing part can be improved.
In addition, according to the present invention, the flange can increase the rigidity of the connecting member, and can prevent foreign matter from entering the vicinity of the mounting member.
According to the present invention, it is not necessary to fix the connecting member, the lead screw, and the housing to the seat cushion frame, it is not necessary to provide the mounting member, and it is not necessary to perform processing for the mounting.
Moreover, according to this invention, a housing can be arrange | positioned compactly.
Further, according to the present invention, it is possible to easily attach the lead screw to the first link at a compact position while avoiding interference in the seat width direction between the housing and the lead screw and each link.
Moreover, according to this invention, the enlargement of a height adjustment mechanism can be suppressed.

1 is a perspective view showing a vehicle seat according to a first embodiment of the present invention. It is a perspective view showing a seat frame concerning a 1st embodiment of the present invention. It is a perspective view which shows the assembly | attachment state of a connection link, a motor, a housing, a lead screw, and a front link from a seat width direction inner side. It is a perspective view which shows the assembly | attachment state of a rear link, a connection link, a motor, a housing, and a lead screw. It is a perspective view which shows a connection link. It is a top view which shows the positional relationship of the 1st engaging part (or 2nd engaging part) of a connection pipe, and a housing. It is a perspective view which shows a torsion bar. It is a side view which shows the state in which a seat cushion frame is located below. It is a side view showing the state where a seat cushion frame is located on the upper side. It is a side view showing the state where the seat cushion frame concerning a 2nd embodiment is located in the lower part.

<< First Embodiment >>
Hereinafter, the configuration of the vehicle seat according to the first embodiment of the present invention will be described. In addition, embodiment described below is for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents.

  In the following description, the “front-rear direction” means the front-rear direction when viewed from the seated person of the vehicle seat, and is the direction that coincides with the traveling direction of the vehicle. The “seat width direction” means the lateral width direction of the vehicle seat and coincides with the left-right direction when viewed from the seated person of the vehicle seat. “Height direction” means the height direction of the vehicle seat, and coincides with the vertical direction when the vehicle seat is viewed from the front.

First, a basic configuration of a vehicle seat S as a vehicle seat according to the present embodiment will be described with reference to FIG. FIG. 1 is a perspective view showing a vehicle seat S according to the first embodiment of the present invention.
The vehicle seat S according to this embodiment has substantially the same configuration as a known general vehicle seat, and includes a seat back S1, a seat cushion S2, and a headrest S3 as shown in FIG. A slide rail mechanism 30 for sliding the seat body (main part of the vehicle seat S) in the front-rear direction is disposed below the seat cushion S2.
The slide rail mechanism 30 corresponds to a base member as a reference for the height of a height adjusting mechanism 40 described later. For example, in a seat without the slide rail mechanism 30, the base member serving as a height reference is a member to which the seat body is attached, such as a floor in a vehicle.

  Furthermore, the vehicle seat S has a seat frame F shown in FIG. 2 as its skeleton. FIG. 2 is a perspective view showing the seat frame F according to the first embodiment of the present invention. The seat frame F includes the seat back frame 10 and the seat cushion frame 20 as main components.

The seat back frame 10 is attached to the seat cushion frame 20 so as to be reclining.
The seat cushion frame 20 has a rectangular frame-like outer shape when viewed from above, and includes a side frame 21 positioned at both ends in the seat width direction and a pan frame 22 constituting the front end of the seat cushion frame 20. And are the main components.
As shown in FIG. 2, the rear ends of the side frames 21 positioned at both ends in the seat width direction are round pipes extending along the seat width direction, and are connected by a connecting pipe 24 as a hollow member. Yes. The connection pipe 24 is supported so as to be rotatable relative to the side frame 21 with the central axis of the connection pipe 24 as a rotation center.

<About the height adjustment mechanism>
By the way, the vehicle seat S of this embodiment is mainly characterized by including a height adjusting mechanism 40 for adjusting the height of the seat cushion S2. The height adjusting mechanism 40 is disposed between the upper rail 32 of the slide rail mechanism 30 and the seat cushion frame 20 in the vertical direction. When the occupant performs a height adjustment operation (for example, an operation of pressing an unillustrated lift button), electric power is supplied to the motor M as one of the drive units of the height adjustment mechanism 40 under the control of a control unit (not shown). By being supplied, the motor M is driven. By driving the motor M, a lead screw 47, which is one of the drive units described below, expands and contracts, and the front link 43 as the first link or link member and the rear link 44 as the second link or link member rotate. Thus, the height of the seat body including the seat cushion S2 is adjusted.

  Hereinafter, the configuration of the height adjustment mechanism 40 according to the present embodiment will be described with reference to FIGS. FIG. 3 is a perspective view showing the assembled state of the connecting link 45, the motor M, the housing 46, the lead screw 47, and the front link 43 from the inner side in the seat width direction. 4 is a perspective view showing an assembled state of the rear link 44, the connecting link 45, the motor M, the housing 46, and the lead screw 47, and FIG. 5 is a perspective view showing the connecting link 45. As shown in FIG. 6 is a plan view showing the positional relationship between the first engaging portion 24a (or the second engaging portion 24b) of the connecting pipe 24 and the housing 46, and FIG. 7 is a perspective view showing the torsion bar 50. is there.

  As shown in FIGS. 3 and 4, the height adjustment mechanism 40 includes a front link 43, a rear link 44, a connection link 45 as a connection member that connects the rear link 44 and the housing 46, a motor M, A lead screw 47 that expands and contracts according to the operation of the motor M is mainly provided. As shown in FIG. 2, the height adjustment mechanism 40 includes a front link 63 as a third link, a rear link 64 and a connection link 65 as a fourth link, and a lead screw (not shown) on the opposite side in the seat width direction. And a motor. Note that only one of the height adjustment mechanisms 40 has the above-described configuration and the other has only the front link 63 and the rear link 64, and the other has the seat cushion frame 20 in accordance with the operation of the one height adjustment mechanism 40. It may be configured to follow.

The front link 43 shown in FIG. 3 is a member that rotates around a rotation axis that faces in the seat width direction in accordance with the expansion and contraction of the lead screw 47 described later, and that supports the front side of the seat cushion frame 20 from below. It is.
Specifically, the front link 43 is formed in a substantially L shape in a side view. An L-shaped bent portion of the front link 43 is rotatably supported by a link support portion 32 a fixed to the upper rail 32. Further, a lead screw attachment portion 43d attached to the end portion of the lead screw 47 is formed on the lower end side of the front link 43, and the rear end side of the L shape is rotated in the seat width direction by the pivot pin 43b. The seat cushion frame 20 is connected to a side frame 21 so as to be rotatable about an axis.

  In particular, a bent portion 43e is formed at the upper and lower intermediate portions of the front link 43 so as to bend downward after extending inward in the seat width direction. Due to the bent portion 43e, one end side (lower end side) of the front link 43 is formed so as to protrude inward in the sheet width direction from the other portions. By being formed in this way, the lead screw mounting portion 43 d is separated from the link support portion 32 a of the upper rail 32 on the inner side in the seat width direction and is positioned on the extension of the lead screw 47. For this reason, the load applied from the lead screw 47 for rotation is efficiently applied to one end side of the front link 43. Further, the lead screw mounting portion 43d is disposed on the inner side in the sheet width direction with respect to the outer end portion 46f on the outer side in the sheet width direction of the housing 46 to be described later, thereby restricting the protrusion to the outer side in the sheet width direction. The increase in the size of the device is suppressed.

The rear link 44 rotates around the rotation axis facing the seat width direction in accordance with the change in the position of the seat cushion frame 20 (side frame 21) due to the rotation of the front link 43, and the rear link 44 It is a member that supports the side from below.
Specifically, the rear link 44 is formed in a flat plate shape that is substantially L-shaped in a side view so that the rear link 44 extends in the front-rear direction and the front portion extends upward with an obtuse angle. The rear link 44 is provided on the outer side in the seat width direction than the front link 43. The bent portion of the L shape in the rear link 44 is rotatably supported by a link pin 32b on a link support portion 32b fixed to the upper rail 32. In addition, a connection hole 44a is formed on the rear link side of the rear link 44, penetrating in the sheet thickness direction, which is the sheet width direction. By inserting the connecting pipe 24 of the seat cushion frame 20 into the connection hole 44a, the rear link 44 is supported so as to be rotatable about the central axis of the connecting pipe 24 with respect to the seat cushion frame 20. Become. Further, the L-shaped front end side of the rear link 44 is pivotally connected to a later-described connecting link 45 around a pivot shaft facing in the seat width direction by a pivot pin 44b.

A torsion bar 50 shown in FIG. 7 as a member for assisting the height adjustment of the seat cushion S2 is provided inside the connecting pipe 24 as a hollow member for connecting the rear end side of the rear link 44 provided on both sides in the seat width direction. Is built-in. The torsion bar 50 is made of a rod-shaped spring and has an extending direction one end 51, an extending direction other end 52, and an extending direction central portion 55, as shown in FIG.
One end portion 51 in the extending direction of the torsion bar 50 is a portion curved in a bowl shape, and the central portion 55 in the extending direction is a portion extending in a straight line. Further, a bent portion 53 that is bent in an obtuse angle is formed at the boundary portion between the extending direction one end portion 51 and the extending direction central portion 55. Further, a folded portion 54 that is folded in a U shape is formed in the middle of the extending direction one end portion 51. The other end 52 in the extending direction of the torsion bar 50 is substantially orthogonal to the central portion 55 in the extending direction, and a bent tip 52a bent in a substantially L shape is formed at the tip. Yes.

  The torsion bar 50 is attached to the inside of the connection pipe 24 in a state in which the central portion 55 in the extending direction is twisted (strictly, in a state in which the central portion 55 is rotated in the direction rotating around the central axis of the central portion 55 in the extending direction). ing. In particular, one end portion 51 in the extending direction of the torsion bar 50 is attached to the first engagement portion 24a and the second engagement portion 24b as the torsion bar support portion inside the connection pipe 24. The first engaging portion 24a and the second engaging portion 24b are formed by recessing the outer peripheral portion of the connecting pipe 24 radially inward. The torsion bar 50 uses the restoring force when restoring from the twisted state as an urging force, and urges a predetermined portion of the seat cushion S2 upward.

The connection link 45 is made of a steel member, and is connected to the rear link 44 while supporting a motor M and a resin housing portion 46P of the housing 46 described later by a metal housing portion 46M formed integrally with the connection link 45. It is a member to do.
Specifically, the connecting link 45 includes an extending part 45 a extending in the front-rear direction and a metal housing part 46 M as a second housing part that is formed on the front side of the extending part 45 a and forms a part of the housing 46. Has been.

The extending portion 45a is formed in a bent plate shape that is formed in a substantially L shape in a top view so as to be bent inward in the sheet width direction on the front side. An insertion hole 45b is formed in the sheet width direction on the rear end side of the extending portion 45a. By connecting the pivot pin 44b through the insertion hole 45b, the connecting link 45 is rotatably supported by the rear link 44. Moreover, the longitudinal direction center part of the extension part 45a is formed in the longitudinal direction which is the extension direction of the extension part 45a, in other words, the recessed part 45c extending in the front-rear direction. By forming the recess 45c, the rigidity of the entire connecting link 45 including the metal housing portion 46M is enhanced.
In particular, when a resin housing portion 46P, which will be described later, is disposed on the extension in the extending direction of the recess 45c, in other words, at a position that intersects the curved cross section of the recess 45c in the extending direction, the resin housing portion 46P is provided. This is preferable because the connection link 45 is protected by a portion having high rigidity.

The metal housing portion 46M as the second housing portion constitutes a part of the housing 46 that covers the speed reduction mechanism 48 that is one of the drive portions, and is formed continuously to the extending portion 45a as shown in FIG. Yes. In detail, the metal housing part 46M includes a first vertical wall 46a, a second vertical wall 46b formed in a parallel direction spaced forward from the first vertical wall 46a, and a first vertical wall 46a. The second vertical wall 46b is connected to the lower end portion of the second vertical wall 46b and extends substantially horizontally, and is formed in a substantially U shape when viewed from the sheet width direction.
The first vertical wall 46a and the second vertical wall 46b have a notch extending from the inner edge in the sheet width direction to the outer side in the sheet width direction, and an insertion hole 46d drilled in the plate thickness direction at the center in the vertical direction. Is formed. The insertion hole 46d is a hole through which a lead screw 47 described later is passed. Further, two holes are formed in the upper end portions of the first vertical wall 46a and the second vertical wall 46b so as to be separated from each other in the sheet width direction. By passing two screws 49a as attachment members through the holes, a resin housing part 46P described later is fixed to the metal housing part 46M.

  Further, a flange 46e is formed at the upper end portion of the first vertical wall 46a so as to extend to the rear side in the front-rear direction of the seat, in other words, to the extended portion 45a side. Similarly, a flange 45d extending inward in the sheet width direction is formed at the upper end, the rear end, and the lower end that are the outer periphery of the extending portion 45a. Thus, the rigidity of the extension part 45a and the metal housing part 46M is improved by forming the flange 46e and the flange 45d, in particular, these being integrally formed continuously. In particular, when the flange 46e is formed so as to cover the top of the head of the screw 49a (strictly, the portion between the screw 49a and the first vertical wall 46a), the screw 49a and the first vertical wall 46a It is easy to avoid the intrusion of foreign matters during the period. For this reason, it is easy to prevent rattling or abnormal noise from occurring during operation of the motor M.

  The motor M is for operating link members such as the front link 43 by generating rotational power in accordance with control of a control unit (not shown). The motor M is attached to the inner side surface of the box-shaped housing 46 in the sheet width direction. The output shaft of the motor M is connected to a speed reduction mechanism 48 provided in the housing 46.

The housing 46 includes the metal housing portion 46M and the resin first housing portion or a resin housing portion 46P as a part of the housing. The housing 46 is connected to the output shaft of the motor M to increase the rotational speed of the motor M. The decelerating mechanism 48 that decelerates is surrounded.
The resin housing portion 46P is fixed to a metal housing portion 46M whose upper side is fixed by passing two screws 49a. The resin housing portion 46P is on the extension of the first engagement portion 24a and the second engagement portion 24b formed in the connecting pipe 24 in the seat front-rear direction. By being arranged in this way, the resin housing portion 46P and the motor M or the like attached to the housing 46 can be prevented from projecting inward in the sheet width direction and can be arranged compactly.

The lead screw 47 has a function of changing the turning state of the front link 43 by changing the amount of protrusion from the second vertical wall 46b according to the operation of the motor M. The lead screw 47 extends substantially from the speed reduction mechanism 48 in the front-rear direction of the seat, and a tip end portion of the lead screw 47 is rotatably attached by a pivot pin 43 c that is passed through a lead screw attachment portion 43 d of the front link 43.
As shown in FIG. 6, the extending portion 45 a of the connecting link 45 is positioned between the lead screw 47 and the rear link 44 in the seat width direction. With such an arrangement, an increase in the size of the height adjustment mechanism 40 is suppressed.
Further, the housing 46 and the lead screw 47 are arranged on the inner side in the seat width direction with respect to the front link 43 so as not to interfere when the front link 43 disposed on the inner side in the seat width direction with respect to the rear link 44 and the rear link 44 operates. It is arranged.

  The operation of the height adjustment mechanism 40 configured as described above will be described with reference to FIGS. 8A and 8B. 8A is a side view showing a state where the seat cushion frame 20 is located on the lower side, and FIG. 8B is a side view showing a state where the seat cushion frame 20 is located on the upper side.

  When an occupant who is a seat occupant performs an operation of raising the seat cushion S2 by performing, for example, an operation of pressing a lift button (not shown) in the height adjustment operation, the motor M is driven and the deceleration mechanism 48 is operated. Accordingly, the protruding length of the lead screw 47 from the housing 46 is shortened. When the protruding length of the lead screw 47 is shortened, as shown in FIG. 8B, the front link 43 attached to the lead screw 47 by the lead screw attachment portion 43d rotates counterclockwise in FIG. 8A. In other words, the front link 43 rotates around the pivot pin 43a attached to the link support portion 32a in the direction in which the pivot pin 43b attached to the side frame 21 moves to a higher position.

The seat cushion frame 20 rotatably connected to the front link 43 by the pivot pin 43 b swings upward as the front link 43 rotates. The rear link 44 connected to the connecting pipe 24 of the seat cushion frame 20 via the connection hole 44a rotates counterclockwise in FIG. In other words, the rear link 44 rotates around the pivot pin 41b attached to the link support portion 32b in a direction in which the connection hole 44a connected to the connection pipe 24 moves to a higher position. That is, the rear link 44 is configured to support the seat cushion frame 20 from below by rotating with the rotation of the front link 43, and to prevent the seat cushion frame 20 from tilting back and forth. ing.
In this way, the seat cushion frame 20 moves from the lower side to the upper side position, and the height of the seat cushion S2 increases.

  At this time, the rear end side of the connecting link 45 is pivotably fixed to the rear link 44 by the pivot pin 44b, so that the rear end side of the connecting link 45 largely swings downward. Note that the pivot pin 43c of the front link 43 is less likely to swing up and down due to the difference in the pivot position and pivot radius compared to the pivot pin 44b. That is, since the front end side of the connection link 45 is connected to the pivot pin 43c of the front link 43 via the housing 46 and the lead screw 47, it swings smaller than the rear end side. By being configured in this manner, the influence of the movement of the connecting link 45 on the motor M and the lead screw 47 connected to the speed reduction mechanism 48 in the housing 46 on the front end side of the connecting link 45 is suppressed. be able to.

  On the other hand, in order to reduce the height of the seat cushion S2, the motor M may be driven to increase the length of protrusion of the lead screw 47 from the housing 46. In this way, the protruding length of the lead screw 47 becomes longer, and each link rotates in the opposite direction, whereby the seat cushion frame 20 moves from the upper side to the lower side, and the height of the seat cushion S2 is lowered. be able to.

<< Second Embodiment >>
Next, the height adjustment mechanism 40a according to the second embodiment will be described with reference to FIG. FIG. 9 is a side view showing a state in which the seat cushion frame 20 according to the second embodiment is positioned on the lower side. In the following description of the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and the differences are clarified.

The height adjustment mechanism 40a is configured to adjust the height according to the first embodiment even when a load on the rear side in the front-rear direction of the seat is applied from the seated person of the vehicle seat S to the seat back S1 due to an impact caused by a rear impact received by the vehicle. The structure is more stable and easier to operate than the mechanism 40.
More specifically, when a rear load is applied to the seat back S1, a clockwise moment as indicated by an arrow in FIG. 9 is applied to the seat cushion frame 20. When this moment is applied, the load applied to the lead screw 47 and the speed reduction mechanism 48 can be reduced. Each component of the height adjusting mechanism 40a that realizes this function will be described.

  As shown in FIG. 9, the height adjustment mechanism 40 a connects the front link 73 as the first link or link member, the rear link 74 as the second link or link member, and the rear link 74 and the housing 46. The connecting link 45, the motor M, and the lead screw 47 that expands and contracts according to the operation of the motor M are mainly provided.

  The front link 73 includes a front member 73a and a rear member 73b, which are plate pieces, and is formed by overlapping the rear end side of the front member 73a and the front end side of the rear member 73b. The front member 73a and the rear member 73b of the front link 73 are overlapped and fixed at an angle, and the front link 73 has an obtuse angle as a whole than the front link 43 that is substantially L-shaped in a side view. It is formed in a shape bent in the lower side (in other words, a substantially U shape).

  The front member 73a is disposed outside the side frame 21 in the seat width direction in order to avoid interference with a front pipe (not shown). The front end side of the front side member 73a is pivotally supported by a link support portion 32a fixed to the upper rail 32 with a pivot shaft facing the seat width direction as a center by a pivot pin 73d. The rear end side of the front side member 73a is fixed to the rear side member 73b by a pivot pin 73c and is supported by the side frame 21 so as to be rotatable about a rotation axis directed in the seat width direction.

  The rear member 73b is disposed on the inner side of the side frame 21 in the seat width direction for connection with the lead screw 47 disposed on the inner side of the side frame 21 in the seat width direction. The front end side of the rear side member 73b is supported by the side frame 21 so as to be rotatable around a rotation axis facing the seat width direction while being fixed to the front side member 73a by a pivot pin 73c. The rear end side of the rear side member 73b is attached by a pivot pin 73e so as to be rotatable around the tip end of the lead screw 47 and a rotation axis directed in the sheet width direction.

  In particular, the rear member 73b is formed in a crank shape when viewed from above, and is attached so that the front end side is along the inner surface in the seat width direction of the side frame 21, and the rear end side is separated from the side frame 21 inward in the seat width direction. It is formed to do. Since the front end side is attached along the side frame 21 in this way, the occurrence of wobble can be suppressed when the rear side member 73b rotates due to the expansion and contraction of the lead screw 47. Furthermore, since the rear end side is arranged on the extension of the extension direction of the lead screw 47, the load applied from the lead screw 47 for rotation is efficiently applied to the rear end side.

  The rear link 74 extends in the front-rear direction, and is formed in a flat plate shape having a generally letter shape in side view so that the front side portion forms an obtuse angle and extends downward. A bent portion of a substantially heck in the rear link 74 is rotatably supported by a link support portion 32b fixed to the upper rail 32 by a pivot pin 41b. Further, the front end side of the rear link 74 is pivotally connected to a connecting link 45 described later around a pivot shaft facing in the seat width direction by a pivot pin 74b.

When a moment in the clockwise direction as indicated by an arrow in FIG. 9 is applied, an instantaneous load applied to the lead screw 47 and the speed reduction mechanism 48 from the front link 73 side is a pivot pin 73e centering on the pivot pin 73c. Is a downward load, and the load in the front-rear direction is small.
At this time, the instantaneous load applied to the lead screw 47 and the speed reduction mechanism 48 from the rear link 74 side via the connecting link 45 is a forward load applied from the pivot pin 74b centering on the pivot pin 41b. . For this reason, the load applied to the lead screw 47 and the speed reduction mechanism 48 is not a tensile load applied by the configuration of the first embodiment but a compressive load. Since the lead screw 47 and the speed reduction mechanism 48 have higher rigidity than the tensile load with respect to the compressive load, the height adjusting mechanism 40a can be applied even if an impact due to a rear impact is applied to the vehicle. The operation is more stable than the height adjustment mechanism 40.

  According to the vehicle seat according to the above-described embodiment, the rigidity of the housing surrounding the speed reduction mechanism connected to the lead screw is increased and the height is adjusted because a part of the housing is formed integrally with the connecting link. The mechanism can be operated stably.

  Further, the motor, the housing, and the lead screw according to the above embodiment are not directly attached to the seat cushion frame, but are attached to the connection frame or the front link. For this reason, for example, when changing to a seat provided with a power lifter to a seat provided with a manual lifter that does not use a motor, there is no need to process the seat cushion frame or attach a member. In other words, using the connecting frame and the front link, the motor, the housing, and the lead screw can be attached and easily modified to have a power lifter.

  In the above description, the vehicle seat is described as an example. However, the present invention is not limited to the vehicle, and the present invention can be applied to a vehicle seat such as an aircraft, a ship, and an industrial machine.

DESCRIPTION OF SYMBOLS 10 Seat back frame 20 Seat cushion frame 21 Side frame 22 Pan frame 24 Connection pipe (hollow member)
24a First engagement part (torsion bar support part)
24b Second engaging part (torsion bar support part)
30 Slide rail mechanism (base member)
32 Upper rails 32a, 32b Link support 40 Height adjustment mechanism 41b Pivot pin 43 Front link (first link, link member)
43a, 43b, 43c Pivot pin 43d Lead screw mounting portion 43e Bending portion 44 Rear link (second link, link member)
44a Connection hole 44b Pivot pin 45 Connection link (connection member)
45a Extension part 45b Insertion hole 45c Recess 45d Flange 46 Housing 46P Resin housing part (first housing part, part of housing)
46M metal housing part (second housing part)
46a First vertical wall 46b Second vertical wall 46c Connection wall 46d Insertion hole 46e Flange 46f Outer end 47 Lead screw (drive unit)
48 Reduction mechanism (drive unit)
49a Screw (Mounting member)
50 torsion bar 51 extending direction one end portion 51a first engaged portion 51b second engaged portion 52 extending direction other end portion 52a bending tip portion 53 bending portion 54 folding portion 55 extending direction central portion 63 front link ( (3rd link)
64 Rear link (4th link)
65 connecting link 73 front link (first link, link member)
73a Front side member 73b Rear side members 73c, 73d, 73e Pivot pin 74 Rear link (second link, link member)
74b Pivot pin F Seat frame M Motor (drive unit)
S Vehicle seat (vehicle seat)
S1 Seat back S2 Seat cushion S3 Headrest

Claims (9)

A base member;
A link member that is rotatably attached to the base member, and is composed of a first link and a second link;
A seat cushion frame that is pivotally connected to the link member and moves up and down according to the rotation of the link member;
A connecting member rotatably connected to one of the first link or the second link;
A vehicle seat comprising: a drive unit that rotates the link member;
The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the other of the speed reduction mechanism and the first link or the second link,
The vehicle seat further includes a housing surrounding the speed reduction mechanism,
The connecting member and a part of the housing are integrally formed,
The housing is composed of a first housing part and a second housing part having higher rigidity than the first housing part,
The connecting member is formed with an extending recess.
The vehicle seat according to claim 1, wherein the first housing portion is disposed on an extension in the extending direction of the recess. A base member;
A link member that is rotatably attached to the base member, and is composed of a first link and a second link;
A seat cushion frame that is pivotally connected to the link member and moves up and down according to the rotation of the link member;
A connecting member rotatably connected to one of the first link or the second link;
A vehicle seat comprising: a drive unit that rotates the link member;
The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the other of the speed reduction mechanism and the first link or the second link,
The vehicle seat further includes a housing surrounding the speed reduction mechanism,
The connecting member and a part of the housing are integrally formed,
The housing is composed of a first housing part and a second housing part,
The connecting member is formed with an extending recess.
The second housing part includes a first vertical wall, a second vertical wall, and a connecting wall that connects the first vertical wall and the second vertical wall,
The connecting member includes an extending portion that extends in the front-rear direction of the seat,
A vehicle seat, wherein a flange is integrally formed at each upper end portion of the first vertical wall and the extending portion of the connecting member. A base member;
A link member that is rotatably attached to the base member, and is composed of a first link and a second link;
A seat cushion frame that is pivotally connected to the link member and moves up and down according to the rotation of the link member;
A connecting member rotatably connected to one of the first link or the second link;
A vehicle seat comprising: a drive unit that rotates the link member;
The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the other of the speed reduction mechanism and the first link or the second link,
The vehicle seat further includes a housing surrounding the speed reduction mechanism,
The connecting member and a part of the housing are integrally formed,
The housing is composed of a first housing part and a second housing part,
The connecting member is formed with an extending recess.
The second housing part comprises a first vertical wall;
The connecting member includes an extending portion that extends in the front-rear direction of the seat,
A flange is formed at the upper end of the first vertical wall,
The first housing part and the second housing part are attached by an attachment member,
The vehicle seat, wherein the attachment member is covered with the flange. A base member;
A link member that is rotatably attached to the base member, and is composed of a first link and a second link;
A seat cushion frame that is pivotally connected to the link member and moves up and down according to the rotation of the link member;
A connecting member rotatably connected to the second link ;
A vehicle seat comprising: a drive unit that rotates the link member;
The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the speed reduction mechanism and the first link ,
The vehicle seat further includes a housing surrounding the speed reduction mechanism,
The connecting member and a part of the housing are integrally formed,
The link member is provided in both the sheet width direction, the sheet and the first link and the second link are arranged one behind the one in the width direction, arranged in front and rear on the other in the sheet width direction It has been, and a fourth link corresponding to the third link and the second link corresponding to the first link,
The vehicle seat includes a hollow member that connects the fourth link and the second link;
A torsion bar that urges the second link or the fourth link upward;
The hollow member has a torsion bar support portion for supporting the torsion bar inside,
The vehicle seat according to claim 1, wherein the housing is disposed on an extension of the torsion bar support portion in the longitudinal direction of the seat. A base member;
A link member that is rotatably attached to the base member, and is composed of a first link and a second link;
A seat cushion frame that is pivotally connected to the link member and moves up and down according to the rotation of the link member;
A connecting member rotatably connected to the second link;
A vehicle seat comprising: a drive unit that rotates the link member;
The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the speed reduction mechanism and the first link,
The vehicle seat further includes a housing surrounding the speed reduction mechanism,
The connecting member and a part of the housing are integrally formed,
The outer end of the first link in the sheet width direction is provided outside the second link in the sheet width direction,
The housing and the lead screw are provided on the inner side in the seat width direction than the second link,
The vehicle seat according to claim 1, wherein the first link is provided with a lead screw mounting portion located on the inner side in the seat width direction than the second link. A base member;
A link member that is rotatably attached to the base member, and is composed of a first link and a second link;
A seat cushion frame that is pivotally connected to the link member and moves up and down according to the rotation of the link member;
A connecting member rotatably connected to the second link ;
A vehicle seat comprising: a drive unit that rotates the link member;
The drive unit includes a motor, a speed reduction mechanism coupled to the motor, and a lead screw connected to the speed reduction mechanism and the first link ,
The vehicle seat further includes a housing surrounding the speed reduction mechanism,
The connecting member and a part of the housing are integrally formed,
The connecting member includes an extending portion that extends in the front-rear direction of the seat,
The vehicle seat according to claim 1, wherein the extending portion is disposed between the second link and the lead screw in the seat width direction. The housing is composed of a first housing part and a second housing part,
The second housing part includes a first vertical wall, a second vertical wall, and a connecting wall that connects the first vertical wall and the second vertical wall,
The connecting member includes an extending portion that extends in the front-rear direction of the seat,
The vehicle according to any one of claims 4 to 6, wherein a flange is integrally formed at an upper end portion of each of the first vertical wall and the extending portion of the connecting member. Sheet. The connecting member is rotatably connected to the second link,
The lead screw is connected to the speed reduction mechanism and the first link;
The outer end of the first link in the sheet width direction is provided outside the second link in the sheet width direction,
The housing and the lead screw are provided on the inner side in the seat width direction than the second link,
The vehicle according to any one of claims 1 to 4, wherein the first link is provided with a lead screw mounting portion located on the inner side in the seat width direction than the second link. Sheet.   The vehicle seat according to claim 5 or 8, wherein the lead screw mounting portion is located on the inner side in the seat width direction than the end portion on the outer side in the seat width direction of the housing.

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