JP2016005924A - Lifter gear suppressing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat lifter which changes the height of a seat by rotating a link by a pinion and a driven gear (sector gear ) provided in the link, and which can reduce costs.SOLUTION: A first plate 131 arranged adjacently to a member provided with a pinion 101, and a second plate 133 for pinching a driven gear 115 in cooperation with the first plate 131 are provided. The three members, that is, the second plate 133, the first plate 131 and the member provided with the pinion 101 are attached by being co-fastened by the same fastening member 141.

Description

  The present invention relates to a gear holding structure provided in a seat lifter that changes the height and inclination of a seat cushion (seat portion) of a seat with respect to a floor.

  One end is rotatably attached to the floor, the other end is attached to the front of the seat cushion of the seat, and one end is rotatably attached to the floor, and the other end is the seat cushion of the seat. The rear link attached to the rear, the floor, and the seat cushion constitute a four-bar rotation chain, the floor is a fixed link, and by rotating either the front link or the rear link, There is a seat lifter that lifts and lowers the seat cushion with respect to the floor.

  As a mechanism for rotating the link, there is a mechanism in which a pinion is provided on the floor or the seat cushion side, a driven gear (sector gear) that meshes with the pinion is provided on the link, and the link is rotated by rotationally driving the pinion.

Hereinafter, the pinion and the driven gear may be collectively referred to as a lifter gear.
In such a mechanism, when a large load acts on the seat, the pinion and the driven gear may be disengaged.

  Therefore, a lifter gear restraining structure is provided in order to maintain positive engagement between the pinion and the driven gear. The conventional lifter gear restraint structure is such that a driven gear is sandwiched between a pair of plates, and the pair of plates are fastened by a fastening member, and one of the fastened plates (a seat cushion which is a member provided with a pinion) (Plate on the (lower arm) side) is attached to the seat cushion (lower arm) by welding (for example, see Patent Document 1).

US Pat. No. 6,502,799 B2

  In the lifter gear restraint structure described in Patent Document 1, when a load that causes vibration of the driven gear is applied to the seat, the load is in the order of fastening member → one plate → welded location → seat cushion (lower arm). Communicated.

  And since the welding location of one plate and a seat cushion (lower arm) and the location where the fastening member of a pair of plate is provided are different, a bending moment generate | occur | produces in one plate centering on a welding location.

  Due to this bending moment, it is necessary to prevent one of the plates from being deformed to disengage the pinion from the driven gear and to prevent the one plate from being peeled off from the seat cushion (lower arm).

  Therefore, in the lifter gear restraint structure described in Patent Document 1, it is necessary to increase the thickness of the plate or to make the plate material high in strength so that the plate does not deform even with a large bending moment. There is a problem that becomes high.

  This invention is made | formed in view of the said problem, The subject is providing the lifter gear restraint structure which can aim at cost reduction.

  In order to realize at least one of the above-described problems, the lifter gear restraint structure reflecting one aspect of the present invention has a floor side in which one end is provided on the seat cushion side member of the seat and the other end is provided on the floor side. A lifter gear restraining structure for a seat lifter that includes a link rotatably attached to each member and a drive mechanism that rotates the link using a lifter gear, and changes the height and inclination of the seat cushion with respect to the floor. The lifter gear is rotatably provided on one of the seat cushion side member and the floor side member, and is provided on the pinion driven by the drive unit and the link, and the pinion is provided. A drib that has a plurality of teeth that mesh with the pinion along a circumference around the rotation center axis of the link on the member side The lifter gear restraining structure comprises a first plate disposed adjacent to one member provided with the pinion, and a second plate sandwiching the driven gear in cooperation with the first plate. And the same fastening member to which the three members of the second plate, the first plate, and the one member provided with the pinion are fastened together.

  Other features of the present invention will become more apparent from the following detailed description and accompanying drawings.

  According to the present invention, the lifter gear restraining structure includes a first plate disposed adjacent to one member provided with the pinion, and a second plate sandwiching the driven gear in cooperation with the first plate. The driven gear has a swing due to the second plate, the first plate, and the same fastening member to which the first member provided with the pinion is fastened together. Even when such a load acts on the sheet, a large bending moment does not occur in the first plate.

Therefore, it is not necessary to increase the thickness of the first plate and the second plate or to make the material high in strength, thereby reducing the cost.
Other effects of the present invention will become more apparent from the following detailed description and accompanying drawings.

It is a figure explaining the invention part of embodiment, and is a cut-part end view in the cutting line II of FIG. It is a figure explaining the invention part of embodiment, and is an enlarged view of II part of FIG. It is a perspective view of the state where the frame of the seat back (backrest) of the seat provided with the seat lifter of the present embodiment is removed. FIG. 4 is a view in the direction of arrows IV in FIG. 3. It is a V direction arrow directional view of FIG. FIG. 4 is a view in the direction of arrow VI in FIG. 3. It is a VII direction arrow line view of FIG.

  First, the overall configuration of a sheet provided with the sheet lifter according to the embodiment will be described with reference to FIGS. 3 is a perspective view of the seat provided with the seat lifter according to the embodiment with the frame of the seat back (back) removed, FIG. 4 is a view in the direction of arrow IV in FIG. 3, and FIG. 5 is a view in the direction of arrow V in FIG. 6 is a view taken in the direction of the arrow VI in FIG. 3, and FIG. 7 is a view taken in the direction of the arrow VII in FIG.

Note that the seat shown in FIG. 3 is a driver seat of a right-hand drive vehicle.
As shown in these drawings, the inner side seat track 1 includes a lower rail 3 provided on a floor via a bracket (not shown), and an upper rail 5 movably engaged with the lower rail 3.

  Similarly, the outer side seat track 7 includes a lower rail 9 provided on a floor via a bracket (not shown), and an upper rail 11 movably engaged with the lower rail 9.

  As shown in FIGS. 3 and 5, the inner side seat track 1 is provided with an inner side locking device that prohibits the movement of the upper rail 5 relative to the lower rail 3. The inner side locking device includes a plurality of locking holes 3a provided in the side of the lower rail 3 along the longitudinal direction of the rail, and a locking member provided in the upper rail 5 and having teeth that can be engaged and disengaged in the locking hole 3a. 4 and a spring 6 that urges the lock member 4 in a direction (lock direction) in which the teeth of the lock member 4 engage with the lock hole 3a.

  Furthermore, as shown in FIG. 6, the outer side lock device for prohibiting the movement of the upper rail 11 relative to the lower rail 9 is also provided in the outer side seat track 7. The outer side locking device includes a plurality of lock holes 9a provided in the side portion of the lower rail 9 along the longitudinal direction of the rail, and a lock member provided in the upper rail 11 and formed with a detachable tooth in the lock hole 9a. 10 and a spring 12 that urges the lock member 10 in a direction (lock direction) in which the teeth of the lock member 10 engage with the lock hole 9a.

  The lock member 4 and the lock member 10 are operated by a lock release lever 8 that extends from the inner lock device to the outer lock device through the front portion of the seat.

  Usually, the teeth of the upper rail 5, the lock member 4 of the upper rail 11, and the lock member 10 engage with the lock hole 3 a and the lock hole 9 a of the lower rail 3 and the lock hole 9 a by the urging force of the spring 6 and the spring 12. The upper rail 11 is in a locked state in which movement of the upper rail 11 is prohibited.

  Here, by pulling upward the portion of the lock release lever 8 located in front of the seat, the teeth of the lock member 4 and the lock member 10 are locked against the urging force of the spring 6 and the spring 12, and the lock hole 3a and the lock member 10 are locked. It will detach | leave from the hole 9a, and will be in the unlocking state in which the movement of the upper rail 5 and the upper rail 11 was permitted.

  As shown in FIGS. 3 to 5, an inner bracket (floor side member) 21 is provided at the top of the upper rail 5 of the seat track 1 on the inner side. At the front portion of the inner bracket 21, one end side of the front link 25 is rotatably provided using a pin 23. One end of the rear link 29 is rotatably attached to the rear portion of the inner bracket 21 using a pin 27.

  As shown in FIGS. 3 and 6-7, an outer bracket (floor side member) 31 is provided at the top of the upper rail 11 of the outer side seat track 7. At the front part of the outer bracket 31, one end side of the front link 35 is rotatably provided using a pin 33. One end of the rear link 39 is rotatably attached to the rear portion of the outer bracket 31 using a pin 37.

  3-7, on the upper rail 5 of the inner side seat track 1 and on the upper rail 11 of the outer side seat track 7, a lower arm (seat cushion side member) 51 and a lower arm (seat cushion) are respectively provided. Side member) 61 is arranged.

  A front pipe 71 is rotatably provided at the front portion of the lower arm 51 and the front portion of the lower arm 61. A rear pipe 73 is rotatably provided at the rear portion of the lower arm 51 and the rear portion of the lower arm 61. Further, a cushion frame 75 is attached to the front side portion of the lower arm 51 and the front side portion of the lower arm 61.

Further, the rear pipe 73 is provided with a rear bracket 76.
As shown in FIG. 3, between the cushion frame 75 and the rear bracket 76, a plurality of S springs (springs made of wire that is repeatedly bent into an S shape) 77 are provided to bridge the two. It has been.

  As shown in FIGS. 3 to 5, the other end portion side of the front link 25 is fixed to a front pipe 71 that is rotatably provided to the lower arm 51. The other end side of the rear link 29 is fixed to a rear pipe 73 that is rotatably provided to the lower arm 51. Thereby, on the inner side, a four-bar rotation mechanism is formed by the inner bracket 21, which is a member on the floor side, the front link 25, the rear link 29, and the lower arm 51.

  Similarly, as shown in FIGS. 3 and 6 to 7, the other end side of the front link 35 is fixed to a front pipe 71 that is rotatably provided to the lower arm 61. The other end portion side of the rear link 39 is fixed to a rear pipe 73 that is rotatably provided to the lower arm 61. Thereby, on the outer side, a four-bar rotation mechanism is formed by the outer bracket 31, which is a member on the floor side, the front link 35, the rear link 39, and the lower arm 61.

  The inner front link 25 and the outer front link 35 are connected via a front pipe 71, and the movement of one front link is transmitted to the other front link via the front pipe 71. The inner side rear link 29 and the outer side rear link 39 are connected via a rear pipe 73, and the movement of one rear link is transmitted to the other rear link via the rear pipe 73. Accordingly, the inner side four-bar rotation mechanism and the outer side four-bar rotation mechanism operate in synchronization. Therefore, by rotating and driving any one of the inner side front link 25, the outer side front link 35, the inner side rear link 29, and the outer side rear link 39, the inner side The lower arm 51 and the lower arm 61 on the outer side move up and down with respect to the inner bracket 21 that is a member on the floor side on the inner side and the outer bracket 31 that is a member on the floor side on the outer side. You can change that.

In the present embodiment, as shown in FIGS. 3 and 6, the outer side rear link 39 is rotated using a drive mechanism.
Here, a drive mechanism for rotating the outer side rear link 39 will be described with reference to FIGS. 1, 2, 3, and 6. FIG. 1 is a diagram for explaining an invention part of the embodiment, and is a cross-sectional view taken along a cutting line II in FIG. 2, and FIG. It is.

  As shown in these drawings, a pinion 101 is arranged on the surface side of the outer side lower arm 61 facing the inner side lower arm 51. On the other hand, a clutch unit 103 is provided on the surface of the outer side lower arm 61 opposite to the surface facing the inner side lower arm 51. An output shaft 105 as an output portion of the clutch unit 103 is inserted into a hole 61a formed in the lower arm 61, protrudes to a surface side facing the inner side lower arm 51 of the outer side lower arm 61, and a pinion is formed on the protruding portion. 101 is attached.

  The clutch unit 103 is provided on the input side, and a lever side clutch portion 109 that controls transmission / cutoff of the output side rotational torque by operation of the lever 107 and an input side from the lever side clutch portion. The brake side clutch unit 111 transmits torque to the output side and blocks reverse input torque from the output side. An example of such a clutch unit is disclosed in Japanese Patent Application Laid-Open No. 2009-30634.

  The rear link 39 is formed with a driven gear (sector gear) 115 formed with a plurality of teeth 113 that mesh with the pinion 101. The teeth 113 of the driven gear 115 have a circumference centered on a rotation center axis (center axis of the rear pipe 73) (indicated by a point O in FIG. 2) on the lower arm 61 side which is a member provided with the pinion 101 of the rear link 39. It is formed along.

  The lever 107 and the clutch unit 103 constitute a drive unit that rotationally drives the pinion 101, and the drive unit (lever 107, clutch unit 103), the pinion 101, and the driven gear 115 of the rear link 39 form the rear link 39. A drive mechanism that rotates is configured.

In addition, although the drive part of this embodiment is a manual type drive part driven manually, it may be a power type drive part which drives the pinion 101 with a motor.
When the lever 107 is swung upward, the pinion 101 rotates in the clockwise direction in FIG. 2 and the driven gear 115 rotates in the counterclockwise direction, whereby the rear link 39 stands, and the inner side lower arm 51, outer The lower arm 61 on the side rises with respect to the inner bracket 21 that is a member on the floor side on the inner side and the outer bracket 31 that is a member on the floor side on the outer side.

  Further, when the lever 107 is swung downward, the pinion 101 rotates counterclockwise in FIG. 2, and the driven gear 115 rotates clockwise, so that the rear link 39 lies down and the inner lower arm 51, The lower arm 61 on the outer side descends with respect to the inner bracket 21 that is a member on the floor side on the inner side and the outer bracket 31 that is a member on the floor side on the outer side.

  In the present embodiment, the driven gear 115 of the rear link 39 is sandwiched between the first plate 131 and the second plate 133. The first plate 131 is disposed so as to be adjacent to the lower arm 61 that is a member provided with the pinion 101.

  The first plate 131, the second plate 133, and the lower arm 61, which is a member provided with the pinion 101, are attached by fastening together with a fastening member including a bolt and a nut.

  Specifically, the driven gear 115 side is attached to the first fastening member 141 via the pinion 101. The other side of the driven gear 115 via the pinion 101 is attached by a second fastening member 151.

  Further, the driven gear (rear link 39) 115 is fixed to the rear pipe 73 so that there is a gap between the first plate 131 and the second plate 133. Therefore, the central axis of the rear pipe 73 becomes the rotational central axis of the driven gear 115.

Further, the first plate 131 is formed with a hole 131 c that faces the hole 61 a formed in the lower arm 61 and through which the output shaft 105 of the clutch unit 103 is inserted. The second plate 133 is opposed to a hole 61 a formed in the lower arm 61, and an output shaft (pinion shaft) 105 of the clutch unit 103 is fitted therein, and a hole 133 c (pinion shaft fitting) that holds the output shaft 105 is formed. Is formed.
(First fastening member 141)
The first fastening member 141 includes a bolt member 143 and a nut 145.

The bolt member 143 includes the following three parts.
A medium diameter portion 143 a that passes through the hole 131 a formed in the first plate 131 and the hole 61 b formed in the lower arm 61.

  -It is connected to the medium diameter part 143a, has a larger diameter than the medium diameter part 143a, passes through a through hole 115a formed in the driven gear 115 of the rear link 39, and has an axial length slightly larger than the thickness of the rear link 39. A large-diameter portion 143b set long.

A threaded portion 143c that is connected to the large-diameter portion 143b, has a diameter smaller than that of the large-diameter portion 143b, has a screw formed on the peripheral surface, and passes through a hole 133a formed in the second plate 133.
A portion exposed through the hole 61b of the lower arm 61 of the medium diameter portion 143a and exposed to the outside is a crimped portion 143d that is pressure-deformed. The caulking portion 143 d is larger than the hole 61 b of the lower arm 61 and presses against the lower arm 61.

Further, a nut 145 is screwed into a portion inserted through the hole 133a of the second plate 133 and exposed to the outside, and the nut 145 is pressed against the second plate 133.
As shown in FIG. 1, the hole 131a of the first plate 131 and the hole 133a of the second plate 133 function as a first fastening member fitting portion to which the first fastening member 141 is attached. Furthermore, the hole 133a is arrange | positioned below the hole 133c (pinion shaft fitting part).
(Second fastening member)
The second fastening member 151 includes a bolt member 153 and a nut 155.

  The bolt member 153 has a screw formed on the peripheral surface thereof, and passes through a hole 61c formed in the lower arm 61, a hole 131b formed in the first plate 131, and a hole 133b formed in the second plate 133.

A nut 155 is screwed into a portion of the bolt member 153 exposed to the outside from the second plate 133 side, and the nut 155 is pressed against the second plate 133.
A portion exposed to the outside from the hole 61c of the lower arm 61 of the bolt member 153 is a crimped portion 153a that is pressure-deformed. The caulking portion 153 a is larger than the hole 61 c of the lower arm 61 and presses against the lower arm 61.

It should be noted that welding may be used instead of caulking to deform the portion exposed to the outside from the hole 61c of the lower arm 61 of the bolt member 153 by pressure deformation.
As shown in FIG. 1, the hole 131b of the first plate 131 and the hole 133b of the second plate 133 function as a second fastening member fitting portion to which the second fastening member 151 is attached.

  As shown in FIG. 2, the second plate 133 is connected to the rotation center axis of the driven gear 115 (the center axis of the rear pipe 73) and the pinion 101 from the first fastening portion fitting portion (the hole 133 a of the second plate 133). It extends so as to expand in a fan shape to the opposite side to the first fastening portion fitting portion (the hole 133a of the second plate 133) via a straight line l connecting the rotation shaft, and the driven gear 115 cooperates with the first plate 131. Has a gear-side connecting portion 171 sandwiching.

A bead 181 that can abut on the driven gear 115 is formed in the gear side connecting portion 171.
Further, the second plate 133 has an anti-gear side coupling portion 173 that extends from the hole 133c that is the pinion shaft fitting portion to the hole 133b that is the second fastening member fitting portion to which the second fastening member 151 is attached. Yes.

  As shown in FIG. 1, the anti-gear side connecting portion 173 is arranged in the vehicle width direction from the hole 133 c serving as the pinion shaft fitting portion toward the hole 133 b serving as the second fastening member fitting portion in the first plate 131 direction. The surface is inclined so as to gradually approach.

According to the above configuration, the following effects can be obtained.
(1) The first plate 131, the second plate 133, and the lower arm 61, which is a member provided with the pinion 101, are attached by being fastened together with a fastening member made of a bolt and a nut, thereby driving the driven gear 115. Even when a load that causes vibration is applied to the sheet, a large bending moment is not generated in the first plate 131.

Therefore, it is not necessary to increase the thickness of the first plate 131 and the second plate 133 or to make the material high-strength, and the cost can be reduced.
(2) Since the gear-side coupling portion 171 is formed on the second plate 133, the receiving surface for the driven gear 115 is widened, so that the driven gear 115 can be vibrated on a wide surface, and the second plate 133 can be made thicker, It is not necessary to increase the strength of the material, and the cost can be reduced.

 (3) The gear-side coupling portion extends from the first fastening member (the hole 133a of the second plate 133) so as to expand in a fan shape, so that the receiving surface for the driven gear 115 further expands.

 (4) Since the bead 181 that can contact the driven gear 115 is formed at the gear side connecting portion 171 of the second plate 133, the amount of tilt (inclination) of the driven gear 115 can be suppressed to be small. In addition, since the contact area between the bead 181 and the driven gear 115 is narrow, the sliding friction resistance against the driven gear 115 is reduced even when the bead contacts.

 (5) The non-gear side coupling portion 173 gradually approaches the first plate 131 in the vehicle width direction from the hole 133c as the pinion shaft fitting portion toward the hole 133b as the second fastening member fitting portion. Since it is an inclined surface, it is possible to suppress a decrease in strength of the second plate 133 rather than forming a stepped surface.

 (6) The driven gear (rear link 39) 115 is fixed to the rear pipe 73 so that there is a gap between the first plate 131 and the second plate 133, so that the driven gear 115 and the pinion 101 can be Variations in dimensional accuracy and mounting accuracy are absorbed, and smooth operation of the driven gear 115 and good engagement between the driven gear 115 and the pinion 101 are obtained.

  In addition, this invention is not limited to the said embodiment. In the above embodiment, the outer-side rear link 39 is driven, but the inner-side rear link 29, the inner-side front link 25, and the outer-side front link 35 may be driven.

101 Pinion 115 Driven Gear 131 First Plate 133 Second Plate 141, 151 Fastening Member

Claims (6)

A link having one end portion rotatably attached to a seat cushion side member of the seat and the other end portion being rotatably attached to a floor side member provided on the floor side, and a drive mechanism for rotating the link using a lifter gear , A lifter gear restraining structure for a seat lifter that changes the height and inclination of the seat cushion with respect to the floor,
The lifter gear is
A pinion rotatably provided on one of the seat cushion side member and the floor side member, and driven by a drive unit;
A driven gear provided on the link and having a plurality of teeth that mesh with the pinion along a circumference around the rotation center axis of the link on the member side on which the pinion is provided;
Consists of
The lifter gear holding structure is
A first plate disposed adjacent to one member provided with the pinion;
A second plate sandwiching the driven gear in cooperation with the first plate;
The same fastening member to which the three members of the second plate, the first plate, and the one member provided with the pinion are fastened together,
Lifter gear holding structure characterized by comprising The fastening member is
A first fastening member provided closer to the driven gear than the pinion;
The second plate is
A pinion shaft fitting portion into which the rotation shaft of the pinion is fitted;
A first fastening member fitting portion to which the first fastening member is attached;
From the first fastening member fitting portion, the first plate extends to a side opposite to the first fastening member fitting portion via a straight line connecting the rotation center axis of the driven gear and the rotation center axis of the pinion. A gear side coupling portion that sandwiches the driven gear in cooperation with
The lifter gear restraining structure according to claim 1, further comprising:   The lifter gear restraint structure according to claim 2, wherein the gear side coupling portion extends from the first fastening member so as to spread in a fan shape.   The lifter gear restraint structure according to claim 2 or 3, wherein a bead capable of contacting the driven gear is formed in the gear side connecting portion. The fastening member is
Having a second fastening member provided on the opposite side of the driven gear through the pinion;
The second plate is
A second fastening member fitting portion to which the second fastening member is attached;
A non-gear side coupling portion extending from the pinion shaft fitting portion to the second fastening member fitting portion;
Have
The non-gear side coupling portion of the second plate is a surface inclined so as to gradually approach the first plate direction from the pinion shaft fitting portion toward the second fastening member fitting portion. The lifter gear restraint structure according to any one of claims 2 to 4.   The lifter gear restraint structure according to any one of claims 1 to 5, wherein there are gaps between the driven gear and the first plate, and between the driven gear and the second plate, respectively.

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