KR20120005088A - Height adjust apparatus of seat for vehicle - Google Patents

Abstract

PURPOSE: A height adjusting apparatus for a vehicle seat is provided to prevent backlash because a retainer and a clutch spring are not required. CONSTITUTION: A height adjusting apparatus for a vehicle seat comprises a front housing(1), an input shaft(4), first and second rotary units(51,52), engagement units(81), elastic members(82), a clutch drum(7), an output member(9), and an output shaft(10). The front housing is fixed to a seat cushion. The input shaft is inserted into the front housing. Multiple first cam surfaces(51c) are formed on the outer surface of the first rotary unit. Multiple second cam surfaces(52c) corresponding to the first cam surfaces are formed on the outer surface of the second rotary unit. The engagement units are arranged on the cam surfaces. The elastic members are inserted between the engagement units. The clutch drum has a pressing surface touching with the engagement units. The output member is meshed with the clutch drum. The output shaft is coupled to the center of the output member and has an output gear which adjusts the height of a seat.

Description

Seat height adjustment device for vehicle {HEIGHT ADJUST APPARATUS OF SEAT FOR VEHICLE}

The present invention relates to a seat height adjustment device for a vehicle, and more particularly, it is possible to expect a cost reduction effect due to the reduction of the number of parts by omitting the retainer for retaining the conventional mater, and also to operate by removing the working gap and storage gap A vehicle seat height adjusting device for increasing efficiency.

Generally, seats, which are driver's seats, auxiliary seats, and passenger seat chairs installed in the front and rear of an interior of a vehicle, are equipped with various convenience devices for the passenger's comfort.

For example, in addition to the sliding function that can be pushed back and forth according to the passenger's body shape, and the lifting function of moving the seat up and down depending on the situation, as well as the reclining to adjust the inclination of the seat back. ) Function.

In addition, the seat height adjusting device is provided with a seat lift function to adjust the height of the seat to the passengers in recent years or more than a set standard vehicle.

The seat height adjusting device is operated using a lever installed on one side of the seat, and is configured to adjust the height of the seat by transmitting external power to the link means of the seat cushion.

The seat height adjusting device is largely composed of a clutch unit and a brake unit, and the clutch unit functions to transmit external input to the link means of the seat cushion, and the brake unit is reversely input. It cuts the power to act to fix the completed link means.

Meanwhile, referring to FIG. 9, in the conventional seat height adjusting device, a retainer for retaining the retainer for power transmission is essentially provided, and the retainer forms an operating gap between the cam surface and the retainer, and between the retainer and the retainer. There is a storage gap. As described above, in the conventional seat height adjusting device, there is a problem that a loss of operating efficiency occurs due to a backlash phenomenon caused by the working gap and the storage gap formed by the retainer.

In addition, in the conventional seat height adjusting device, a separate clutch spring is essentially provided for returning the retainer or the engaging device to the initial position, thereby causing a problem in manufacturing cost increase due to the increase in the number of parts.

The present invention has been made to solve the above problems, by omitting the retainer for retaining the retainer for power transmission, thereby eliminating the storage gap formed between the retainer and the retainer to reduce the operating efficiency of the backlash. It is a main problem to provide the vehicle seat height adjustment apparatus which can be prevented.

In another aspect, the present invention is to provide a cost reduction through the reduction of the number of parts by not having a separate clutch spring for returning the engaging member to the initial position.

Vehicle seat height adjustment apparatus according to the present invention as a means for solving the above problems, the front housing is fixed to the seat cushion, the space formed therein is closed by the rear cover; An input shaft inserted into the front housing and rotating according to an external input; A first rotating part inserted into the center of the input shaft, rotating in the same direction according to one side rotation of the input shaft, and having a plurality of first cam surfaces formed on an outer circumferential surface thereof; A second pivot portion inserted into the center portion and rotating in the same direction according to rotation of the other side of the input shaft, and having a plurality of second cam surfaces facing the first cam surface on the outer circumferential surface thereof; Engaging members disposed on the cam surfaces; An elastic member inserted between the pair of engaging members disposed on opposite cam surfaces to elastically support the cam member; A clutch drum having a pressing surface in frictional contact with each of the engaging members on an inner circumferential surface of a central portion thereof; An output member driven by engagement with the clutch drum; An output shaft fixedly coupled to the center of the output member and having an output gear for adjusting the seat height at the front end thereof, the engaging member disposed on the first cam surface or the second cam surface according to the rotational direction of the input shaft rotates and The clutch drum is configured to rotate in the same direction as the input shaft by frictional contact between the rotationally moving engagement member and the pressing surface.

Here, the input shaft is preferably spline-coupled to the center portion of the first rotating part and the second rotating part in order.

In addition, the vehicle seat height adjustment device is located between the inner bottom surface of the front housing and the front of the first rotating part, a plurality of limiting projections for limiting the rotation of the first and second rotating parts in the rear edge in the axial direction. It characterized in that it further comprises a; rotational limiting member protruding.

In the vehicle seat height adjusting device, a plurality of first cam protrusions are formed to radially protrude from the outer circumferential surface of the first pivot, and each first cam protrusion is formed with a first cam surface having a step in one circumferential direction. ; On the outer circumferential surface of the second rotating part, a plurality of second cam protrusions are formed to protrude radially, and each of the second cam protrusions is formed such that a second cam surface forming a step in the other circumferential direction is disposed to face the first cam surface. desirable.

In addition, the first cam protrusion protrudes rearward in the axial direction, the second cam protrusion protrudes forward in the axial direction, and the first cam protrusion and the second cam protrusion are alternately arranged with each other in the axial direction. It is more preferable that it is comprised so that it may not overlap.

According to the vehicle seat height adjustment device of the present invention, it is possible to prevent the backlash due to the storage gap and the operating gap to increase the operating efficiency due to the omission of the retainer for storing the engaging.

In addition, according to the present invention, the cost reduction effect can be expected through the reduction of the number of parts by eliminating the retainer for storing the retainer and the clutch spring for the return of the retainer.

1 and 2 are an exploded perspective view showing a vehicle seat height adjustment device according to the present invention.
3 is a plan view showing the vehicle seat height adjustment device.
4 is a cross-sectional view taken along line AA ′ of FIG. 3.
5 and 6 are cross-sectional views taken along line BB ′ of FIG. 4 showing an operating state.
7 is a plan view illustrating first and second input units in the vehicle seat height adjusting apparatus.
8 is a cross-sectional view taken along the line CC ′ of FIG. 4.
Figure 9 is a schematic diagram showing an operating state of the vehicle seat height adjustment device according to the prior art.

Hereinafter, a preferred embodiment of the vehicle seat height adjustment device of the present invention will be described with reference to the accompanying drawings.

1 and 2, and 3 and 4 are shown an exploded structure and a cross-sectional structure of the vehicle seat height adjustment device according to the present invention, respectively, and the operating state of the clutch unit is shown in FIGS. 8 illustrates a cross-sectional structure of the brake unit.

1 to 4, the seat height adjustment device for a vehicle according to the present invention is coupled to the front housing (1), the rear of the front housing (1) to form an interior space (2), and the handle lever ( Clutch unit (A) for releasing the brake force by forming a force transmission path coaxial with the shaft center according to the rotational force according to the rotational force of (not shown), and rotates through the clutch unit (A) with the brake force released And a brake unit B for forcibly rotating the link side sector gear to adjust the seat height.

On the other hand, the handle lever operation applied to the present invention is an up (UP) / down (DOWN) method, and rotates in the counterclockwise direction when the handle lever UP (UP), rotates in the clockwise direction when the handle lever (DOWN).

The front housing 1 has a shaft hole 1a, a side flange 1b, a coupling hole 1c, and a guide slot 1d formed in a cylindrical body in which an inner space is formed by combining the rear cover 2. .

That is, the front housing 1 has a shaft hole (1a) is formed at the front center position, side flanges (1b) are formed on both sides, a plurality of coupling holes (1c) are formed on the side flange (1b), the front A guide slot 1d is formed at one side of the outer edge while being concentric with the shaft hole 1a.

Here, the guide slot (1d) is a space through which the stop leg (3b) of the lever bracket (3) for inputting power to the input shaft (4) for lifting the seat, the stop leg (3b) is a guide slot ( The change angle of the handle lever is limited by 1d).

The rear cover 2 is coupled to the open rear surface of the front housing 1, the shaft hole (2a) is formed in the front center position, the side flange (2b) is formed on both sides, the side flange (2b) A plurality of fixing pins (2c) is inserted into the coupling hole (1c) of the front housing (1) is formed so as to extend through the coupling hole (1c) in the outward direction so that the output gear (10a) of the output shaft 10 through The high information 2d is formed.

Since the front housing 1 and the rear cover 2 are respectively formed through holes on the side flanges 1b and 2b, they are fastened to each other by the fastening means through the through holes.

The front housing 1 and the rear cover 2 drill shaft holes 1a and 2a at the center of the shaft to position the clutch unit A and the brake unit B on the axis center line.

On the other hand, the clutch unit (A) is made of the following structure.

The clutch unit (A) is inserted into the front housing (1) and the input shaft (4), one end of which is fixedly coupled to the lever bracket (3), and the rear end of the input shaft (4) is a rotating member (5) , The rotation limiting member 6 for limiting the rotation of the rotating member 5, the torque transmitting part 8 which is elastically moved by the rotating member 5, and the input shaft 4 by the torque transmitting part 8. It comprises a clutch drum 7 which rotates in conjunction with the rotation of the.

The lever bracket 3 is connected to a handle lever (not shown in the drawing) connected to the front to adjust the seat height, a shaft hole 3a for coupling the input shaft 4 is formed at the center thereof, and an axis center direction at the rear side thereof. As a result, a stop leg 3b protrudingly extending through the guide slot 1d of the front housing 1 is formed. At this time, the stop leg 3b is inserted into the guide slot 1d of the front housing 1 to limit the rotation angle of the lever bracket 3.

The input shaft 4 is inserted into the shaft hole 3a of the lever bracket 3 through the shaft hole 1a of the front housing 1, and the rear end thereof is located in the inner space of the front housing 1, In the center, an insertion hole through which the tip of the output shaft 10 is inserted is formed. On the other hand, the input shaft (4) is inserted into the center of the rotation member 5 is interlocked, for this purpose, a plurality of spline projections for spline coupling to the center of the rotation member (5) on the outer peripheral surface of the rear end of the input shaft (4) Reference numerals are omitted).

The rotating member 5 includes a first rotating part 51 and a second rotating part 52 which are splined to the outer circumferential surface of the input shaft 4 in order.

As for the 1st rotation part 51 couple | bonded with the front-end | tip of the outer peripheral surface of the said input shaft 4, the spline hole-shaped coupling hole 51a is formed in the center part, and many 1st cam protrusion 51b protrudes radially on the outer peripheral surface. Is formed. At this time, each of the first cam protrusion (51b) is formed with a first cam surface (51c) forming a step in one circumferential direction, for example, as shown in Figures 1 to 7 The first cam surface 51c is formed.

In addition, the second pivot 52 coupled to the rear end of the outer peripheral surface of the input shaft 4 has a spline hole-shaped coupling hole 52a formed at the center thereof, and a plurality of second cam protrusions 52b are radially formed on the outer peripheral surface thereof. Is formed to protrude. At this time, the coupling hole 51a of the first pivoting part 51 and the coupling hole 52a of the second pivoting part 52 are arranged to partially overlap in the axial direction, and the input shaft 4 is disposed at the overlapping part. Inserted through and splined together.

In addition, each of the second cam protrusions 52b is provided with a second cam surface 52c which forms a step in the circumferential direction opposite to the first cam protrusions 51b. For example, as shown in FIGS. Similarly, the second cam surface 52c of the stepped structure is formed in the clockwise direction. That is, the first cam surface 51c and the second cam surface 52c are disposed in mutually opposite directions. Here, each of the cam surfaces 51c and 52c has a concave curved or linear planar shape, whereby the engaging member 81 is wedge-coupled between the cam surfaces 51c and 52c and the inner circumferential surface of the clutch drum 7.

On the other hand, the first cam protrusion (51b) and the second cam protrusion (52b) are arranged alternately with each other so as not to overlap each other in the axial direction. In addition, the first cam protrusion 51b protrudes rearward in the axial direction, and the second cam protrusion 52b protrudes forward in the axial direction. In this case, the first cam protrusion 51b and the second cam protrude. The thickness of the protrusion 52b may be formed to be similar to the sum of the body thicknesses of the first rotating part 51 and the second rotating part 52.

And the width of each spline groove formed in the center of the first rotating part 51 and the second rotating part 52 is formed somewhat longer than the width of the spline protrusion formed on the outer peripheral surface of the input shaft (4), thereby A gap of a predetermined size is formed between the spline groove and the spline protrusion. Accordingly, the input shaft 4 splined to the centers of the first rotating part 51 and the second rotating part 52 can rotate by a predetermined angle in the clockwise and counterclockwise directions.

For example, as shown in FIG. 7, the spline protrusion of the input shaft 4 has its left side contacting the inner circumferential surface of the spline groove of the first pivoting portion 51, and its right side is the second pivoting portion 52. It may be configured to contact the inner peripheral surface of the spline groove. Therefore, when the input shaft 4 rotates in the counterclockwise direction (left direction in FIG. 7), the first rotating part 51 rotates together, due to the play between the input shaft 4 and the second rotating part 52. The second rotating part 52 does not rotate. On the contrary, when the input shaft 4 rotates clockwise (the right direction in FIG. 7), the second rotating part 52 rotates together, due to the play between the input shaft 4 and the first rotating part 51. The first rotating part 51 is not rotated.

The rotation limiting member 6 is located between the inner bottom of the front housing 1 and the front of the first pivot 51 and has a hole 6a through which the input shaft 4 penetrates. In addition, a plurality of limiting protrusions 6b for limiting the rotation of the pivoting member 5 protrude in the axial direction at the rear edge of the pivotal restricting member 6.

Here, the limiting protrusion 6b is inserted between the first cam protrusion 51b and the second cam protrusion 52b, thereby limiting the rotation of the first rotating part 51 and the second rotating part 52. . The limiting protrusion 6b is preferably provided in the same number as the cam protrusions 51b and 52b.

In addition, the torque transmission unit 8 serves to transmit the rotational torque of the input shaft 4 to the clutch drum 7, a plurality of engaging members 81 disposed on each cam surface (51c, 52c), It is configured to include an elastic member 82 for elastically supporting between the pair of engaging member (81).

That is, the engaging members 81 are disposed on the cam surfaces 51c and 52c, respectively, and the cam surfaces 51c and 52c and the engaging members 81 are preferably arranged in one-to-one correspondence. The engaging member 81 is constrained between the cam surfaces 51c and 52c and the inner circumferential surface of the clutch drum 7 to move together with the cam surfaces 51c and 52c when the input shaft 4 rotates. The engagement member 81 may have a ball or roller shape, and other shapes are possible.

In addition, the elastic member 82 is inserted and elastically supported between the pair of engaging members 81 disposed on the first cam surface 51c and the second cam surface 52c facing each other, for example, made of a coil spring. Can be.

For example, as illustrated in FIGS. 5 to 7, three first cam protrusions 51b protrude in the circumferential direction on the outer circumferential surface of the first pivoting part 51, and each of the first cam protrusions 51b The first cam surface 51c of the stepped structure is formed in the counterclockwise direction. In addition, three second cam protrusions 52b protrude in the circumferential direction on the outer circumferential surface of the second pivoting part 52, wherein the first cam protrusions 51b and the second cam protrusions 52b are alternately disposed to form a shaft. No overlap in the direction. In each of the second cam protrusions 52b, a second cam surface 52c having a stepped structure is formed in a clockwise direction. Here, a total of six engaging members 81 are disposed on each of the cam surfaces 51c and 52c, and a total of three elastic members 82 are disposed between the first cam surface 51c and the second cam surface 52c which are disposed to face each other. Is inserted.

Accordingly, as shown in FIGS. 5 and 6, when the input shaft 4 rotates counterclockwise, the first pivot 51 splined to the input shaft 4 rotates counterclockwise, and rotates counterclockwise. The eastern portion 52 is supported by the limiting protrusion 6b so as not to rotate. Therefore, the engaging member 81 disposed on the first cam surface 51c of the first rotating unit 51 moves counterclockwise, and the engaging member disposed on the second cam surface 52c of the second rotating unit 52. The 81 remains as it is, and the elastic member 82 inserted between the pair of engaging members 81 is elastically compressed. On the contrary, when the input shaft 4 rotates in the clockwise direction, the second pivoting portion 52 rotates clockwise, and the first pivoting portion 51 is supported by the limiting projection 6b so as not to rotate.

On the other hand, the first and second pivoting portions 51, 52, on which the cam surfaces 51c, 52c are formed, are located at the center of the clutch drum 7, and at the inner circumferential surface of the center of the clutch drum 7, The pressing surface 7a which is in frictional contact is formed. That is, the engaging member 81 is inserted between each of the cam surfaces 51c and 52c and the pressing surface 7a of the clutch drum 7, and the engaging member 81 includes the cam surfaces 51c and 52c and the clutch drum 7. By frictional contact with each of the pressing surfaces 7a of the c), the rotational torque of the input shaft 4 can be transmitted to the clutch drum 7 via the engaging member 81.

In addition, a shaft hole is formed in a central portion of the clutch drum 7, and a plurality of protruding legs 7b protruding in the axial direction are formed on the outer circumferential surface, and such protruding legs 7b protrude on the outer circumferential surface of the output member 9. By being inserted between the formed wedge boss 9a, the rotational force of the clutch drum 7 can be transmitted to the output member 9.

As described above, the clutch drum 7 also rotates in accordance with the rotation of the input shaft 4 by frictional contact between the engaging member 81 disposed on the cam surfaces 51c and 52c and the pressing surface 7a. do. At this time, each engaging member 81 is frictionally contacted between the cam surfaces 51c and 52c and the pressing surface 7a of the clutch drum 7, and is elastically supported by a neighboring elastic member 82, thereby maintaining a conventional retainer. There is no need. Therefore, the storage gap caused by the existence of the conventional retainer is not formed, and the operating gap between the cam surfaces 51c and 52c and the engaging member 81 can also be minimized, thereby increasing the operating efficiency.

Next, look at the configuration of the brake unit (B). The brake unit B may be variously modified in addition to the embodiments described below.

1, 2 and 8, the brake unit (B) is coupled to the output member (9) and the output member (9) having a wedge boss (9a) protruding on the outer peripheral surface of the body, the rear An output shaft 10 having an output gear 10a which is pulled out into the shaft hole 2a of the cover 2 and engaged with the link-side sector gear, and is positioned on the output member 9 side and braked with a frictional force against the front housing 1; It consists of a roller member 11 for generating a force.

In the present embodiment, the output member 9 forms a latch hole around the shaft, and the output shaft 10 is latched to each other by forming a latch, but the output member 9 and the output shaft 10 are integrally formed by a forced press. It may have a structure.

On the outer circumferential surface of the output member 9, a plurality of wedge bosses 9a protrude at regular intervals, and the protruding legs 7b of the clutch drum are inserted between the wedge bosses 9a. Further, on the outer circumferential surface of the output member 9, roller position surfaces 9c into which the first and second roller shafts 11a and 11b of the roller member 11 are inserted are formed with the wedge bosses 9a interposed therebetween. The roller position surface 9c is connected to the restraint section surface 9d protruding from the outer peripheral surface of the body of the output member 9.

The restraint section surface 9d reduces the distance between the front housing 1 and the output member 9 to implement a wedge action on the roller member 11, thereby restraining the output member 9 with a strong brake force to constrain the output shaft. It becomes possible to prevent the rotation of (10).

The output shaft 10 has an output shaft 10b whose end is inserted into the shaft hole 1a of the front housing 1 and has an output gear 10a snapped to the link side sector gear at the rear end thereof, and is extended out of the rear cover 2. And a latch shaft having a latch coupled to the latch hole of the output member 9 in the extension shaft 10b.

The output gear 10a is engaged with the link side sector gear to raise or lower the link side when the brake force is released, and restrain the link side movement when the brake force is formed.

The roller member 11 according to the present invention is located between the paired first and second roller shafts 11a and 11b and the first and second roller shafts 11a and 11b, and the first roller shaft 11a and It consists of the insert spring 11c which pushes out the 2nd roller shaft 11b, respectively.

The insert spring 11c has a structure that pushes the first and second roller shafts 11a and 11b located on both sides while wrapping the wedge boss 9a of the output member 9, for this purpose, to have an "M" shape. Make it.

As shown, the first and second roller shafts 11a and 11b, which are assembled to the roller position surface 9c on the side of the wedge boss 9a of the output member 9 and are pushed out from the insert spring 11c, By constraining the movement through the constraining section surface 9d protruding while connecting the roller position surface 9c, it is possible to constrain the rotation of the output member 9.

The roller member 11 is composed of a pair of first and second roller shafts 11a and 11b and an insert spring 11c, and is composed of one pair of six pairs having a 60 ° interval.

Hereinafter, look at the operation of the vehicle seat height adjustment apparatus according to the present invention.

When the stop leg 3b of the lever bracket 3 moves in the guide slot 1d of the front housing 1 by the UP or DOWN of the handle lever, the shaft hole of the lever bracket 3 The input shaft 4 fixed to 3a) also moves and rotates. Here, since the UP or DOWN of the lever lever is the reverse direction only in the rotational direction and all the operations are the same, the operation direction of the handle lever is not limited.

When the input shaft 4 rotates as described above, the first rotating part 51 of the rotating member 5 splined to the outer circumferential surface of the input shaft 4 rotates in the rotational direction of the input shaft 4, The two rotating parts 52 are supported by the limiting protrusion 6b so as not to rotate. In this case, when the input shaft 4 rotates in the opposite direction, the second rotating part 52 rotates and the first rotating part 51 does not rotate.

As such, when the first pivoting part 51 rotates, the engaging member 81 disposed on the first cam surface 51c of the first cam protrusion 51b also moves in the circumferential direction, whereby a pair of engaging members ( Each elastic member 82 inserted between 81 is elastically compressed. At this time, the clutch drum 7 is rotated by the frictional contact between each engaging member 81 and the pressing surface 7a, and the fixing of the brake unit B is released.

That is, the clutch drum 7 subjected to the strong push of the engaging member 81 rotates the roller member 11 while rotating in the same direction as the input shaft 4, through which the clutch drum 7 outputs the output member 9. ) Is switched to a state capable of rotating.

At this time, a slight gap is formed between each engaging member 81 and the pressing surface 7a of the clutch drum 7, and the cam protrusions 51a and 51b are rotated by any of the cam protrusions 51a and 51b which rotate. Only the engaging members 81 disposed on the cam surfaces 51c and 51c of the < RTI ID = 0.0 >) < / RTI > For example, when the first rotating unit 51 is rotated, only the engaging member 81 disposed on the first cam surface 51c forms a wedge coupling with the pressing surface 7a of the clutch drum 7. The engagement member 81 disposed on the two cam surfaces 52c does not make wedge engagement with the pressing surface 7a of the clutch drum 7, so that the clutch drum 7 is in the same direction as the first pivot 51. It can rotate.

Then, the rotation of the clutch drum 7 causes the protruding leg 7b to press the second roller 11b located in the rotational direction of the roller member 11, and the second roller 11b pushed by the pressing force. Compresses and deforms the insert spring 11c fitted to the wedge boss 9a.

As described above, the second roller 11b is moved from the restraint section surface 9d to the roller position surface 9c, whereby the frictional force between the front housing 1 and the clutch drum 7 is greatly weakened or released. .

In this state, rotation of the clutch drum 7 rotates the output member 9 in the same direction, and rotation of the output member 9 rotates the output shaft 10 fixed to the output member 9 in the same direction. .

Subsequently, the output gear 10a fixed to the output shaft 10 is rotated in the same direction by the rotation of the output shaft 10, and the rotation of the output gear 10a is transmitted to the interlocking sector gear, so that the link is provided through the sector gear. The page is activated so that the seat height can be adjusted.

On the other hand, if the load applied to the handle lever is released after the seat height adjustment is completed, the clutch unit A returns to the initial state by the elastic restoring force of the elastic member, and at the same time, the brake unit B is also switched back to the locked state.

The initial state restoration of the clutch unit A is performed through the following process.

When the engaging member 81 is moved in the reverse direction by the elastic restoring force of the elastic member 82 elastically compressed by the engaging member 81 moved in the rotational direction of the applying shaft 4, the engaging member 81 is moved. Rotating portions 51b and 51b having cam surfaces 51c and 51c disposed also rotate in the same direction, and the input shaft 4 splined to the rotating portions 51b and 51b also rotates in the reverse direction to an initial state. Will return. In addition, the clutch drum 7 in friction contact with the engaging member 81 also rotates in the reverse direction to return to the initial position.

The restoration of the initial state of the brake unit B is performed through the following process.

When the engaging member 81 rotated in the opposite direction during the handle lever operation by the elastic restoring force of the elastic member 82 rotates the clutch drum 7 in the same direction, the rotation force applied through the clutch drum 7 is released. At the same time, the wedge action of the roller member 11 is implemented again.

That is, when the load of the clutch drum 7 against the roller member 11 is released, the second roller 11b which receives the elastic restoring force of the insert spring 11c that has been compressed is the roller position surface of the output member 9 ( It is moved back from the side 9c) toward the restraint section surface 9d, and is converted to the initial state.

The return of the initial state of the roller member 11 implements a wedge action, a brake force that forms a strong friction force between the front housing 1 and the output member 9, so that the output shaft 10 on the link side through the load applied to the seat. The rotational force transmitted to) is cut off from the output member 9 constrained to the front housing 1, and thus the seat can be fixed in a state where the height is adjusted.

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, the scope of protection of the present invention is not limited to the above embodiment, and those skilled in the art of the present invention It will be understood that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

1: Front housing 1a, 2a, 3a: Shaft hole
1b, 2b: side flange 1d: guide slot
1c: coupling hole 2: rear cover
2c: fixing pin 2d: high information
3: lever bracket 3b: stop leg
4 input shaft 5 rotating member
51: first rotating part 51a: coupling hole
51b: first cam protrusion 51c: first cam surface
52: second rotating part 52a: coupling hole
52b: second cam projection 52c: second cam surface
6: limiting member 6b: limiting projection
7: clutch drum 7a: pressing surface
7b: protruding leg 8: torque transmission part
81: engaging member 82: elastic member
9: output member 9a: wedge boss
9b: spline groove 10: output shaft
10a: output gear 11: roller
11a: first roller shaft 11b: second roller shaft
11c: Insert spring A: Clutch unit
B: Brake Unit

Claims (5)

A front housing fixed to the seat cushion and having a space formed therein closed by the rear cover;
An input shaft inserted into the front housing and rotating according to an external input;
A first rotating part inserted into the center of the input shaft, rotating in the same direction according to one side rotation of the input shaft, and having a plurality of first cam surfaces formed on an outer circumferential surface thereof;
A second pivoting part inserted into a central portion thereof, rotating in the same direction according to rotation of the other direction of the input shaft, and having a plurality of second cam surfaces opposed to the first cam surface formed on an outer circumferential surface thereof;
Engaging members disposed on the cam surfaces;
An elastic member inserted between the pair of engaging members disposed on opposite cam surfaces to elastically support the cam member;
A clutch drum having a pressing surface in frictional contact with each of the engaging members on an inner circumferential surface of a central portion thereof;
An output member driven by engagement with the clutch drum;
And an output shaft fixedly coupled to the center of the output member and provided with an output gear for adjusting the seat height at the front end thereof.
The engaging member disposed on the first cam surface or the second cam surface rotates according to the rotational direction of the input shaft, and the clutch drum is configured to rotate in the same direction as the input shaft by frictional contact between the rotating moving engaging member and the pressing surface. Vehicle seat height adjustment device. The method of claim 1,
The input shaft is a vehicle seat height adjustment device, characterized in that the spline coupled to the central portion of the first pivot and the second pivot in order. The method of claim 1,
A rotation limiting member, positioned between the inner bottom of the front housing and the front of the first pivot, and having a plurality of limiting protrusions protruding in the axial direction at the rear edge thereof to limit rotation of the first pivot and the second pivot;
Vehicle seat height adjustment device further comprising a. The method of claim 1,
A plurality of first cam protrusions are formed to radially protrude from the outer circumferential surface of the first pivoting portion, and each first cam protrusion is formed with a first cam surface having a step in one circumferential direction;
On the outer circumferential surface of the second rotating part, a plurality of second cam protrusions are formed to protrude radially, and each of the second cam protrusions is formed such that a second cam surface forming a step in the other circumferential direction is disposed to face the first cam surface. Vehicle seat height adjustment device. The method of claim 4, wherein
The first cam protrusion protrudes backward in the axial direction, the second cam protrusion protrudes forward in the axial direction, and the first cam protrusion and the second cam protrusion are alternately arranged to not overlap each other in the axial direction. Vehicle seat height adjustment device, characterized in that not configured.

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