KR101144858B1 - Height adjust apparatus of seat for vehicle - Google Patents

Abstract

The present invention is fixed to the seat cushion, the space formed inside the front housing is closed by the rear cover; An input shaft inserted into the front housing and having a plurality of cam surfaces having a curved or planar shape concave on an outer circumferential surface at predetermined intervals; A plurality of second engagement members disposed on the cam surface; A retainer accommodating the second engagement member and rotating in linkage with an outer circumferential surface of the input shaft; An output member having a friction surface in frictional contact with the second engagement member formed at an inner circumferential surface of a central portion; 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, and when the input shaft rotates, second engaging members disposed on each cam surface rotate and rotate with the second engaging member. It relates to a vehicle seat height adjustment device characterized in that the output member is configured to rotate by frictional contact between the friction surfaces.
According to the present invention, by shortening the torque transmission path from the input shaft to the output shaft, it is possible to increase the operating efficiency, and also to omit the expensive heat treatment process conventionally performed on the clutch drum, thereby reducing the manufacturing cost and the process time It becomes possible.

Description

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

The present invention relates to a vehicle seat height adjustment device, and more particularly to a vehicle seat height adjustment device that can increase the operating efficiency by allowing the torque of the input shaft to be transmitted directly to the output member without passing through the clutch drum. .

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.

On the other hand, the torque transmission path in the conventional seat height adjusting device is configured such that torque is transmitted in the order of the input shaft, the engagement rod, the clutch drum, the output member, and the output shaft.

However, the conventional seat height adjusting device has a problem in that the torque transmission path is too complicated to lower the operating efficiency.

In addition, the torque transmission between the engaging and the clutch drum is made through the frictional contact generated between the outer circumferential surface of the engaging and the inner peripheral surface of the clutch drum, the expensive heat treatment for the clutch drum due to the high surface pressure generated during the friction contact process Through the process, there was a problem that causes the increase in manufacturing cost and the increase in the processing time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is a main problem to provide a vehicle seat height adjusting device capable of shortening the torque transmission path from the input shaft to the output shaft to increase the operating efficiency.

In addition, the present invention by omitting or minimizing the role of the clutch drum in the torque transmission path from the input shaft to the output shaft, it is possible to omit the expensive heat treatment process conventionally performed on the clutch drum, thereby reducing the manufacturing cost and process time It is another problem to do.

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 having a plurality of cam surfaces having a curved or planar shape concave on an outer circumferential surface at predetermined intervals; A plurality of second engagement members disposed on the cam surface; A retainer accommodating the second engagement member and rotating in linkage with an outer circumferential surface of the input shaft; An output member having a friction surface in frictional contact with the second engagement member formed at an inner circumferential surface of a central portion; 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, and when the input shaft rotates, second engaging members disposed on each cam surface rotate and rotate with the second engaging member. The output member is configured to rotate by frictional contact between the friction surfaces.

The vehicle seat height adjusting device may further include: a first engaging member accommodated in the retainer and disposed on a cam surface; A clutch drum is formed on the inner circumferential surface of the central portion in frictional contact with the first engaging member, and the clutch drum rotates in coordination with the output member. When the input shaft rotates, the first engaging members disposed on the respective cam surfaces rotate. The clutch drum is preferably configured to rotate by frictional contact between the first engagement member and the pressing surface.

In addition, the vehicle seat height adjustment device, the wedge boss protruding at a predetermined interval from the edge of the output member; It is formed to protrude rearward from the edge of the clutch drum, and protruding legs inserted between the wedge boss; may be configured to further include.

In addition, the vehicle seat height adjustment device, the support protrusion protruding in the axial direction from the front end of the retainer; A second clutch spring that elastically supports the support protrusion to provide an elastic restoring force for returning the retainer to an initial position; And a spring stopper member on which the second clutch spring is seated on an edge inner circumferential surface thereof.

In addition, the vehicle seat height adjustment device, one end of the input shaft is fixedly coupled, the lever bracket having a stop leg protruding and extending in the axial direction; And a first clutch spring elastically supporting the stop leg so as to provide an elastic restoring force for returning the lever bracket to an initial position, and seated on an inner circumferential surface of the spring stopper member.

Here, the outer edge of the spring stopper member is formed in a ring-shaped groove which is opened in the front housing direction to seat the first clutch spring, and the inner edge is opened in the opposite direction of the front housing to ring the second clutch spring to be seated. More preferably, grooves of the form are formed.

In addition, the vehicle seat height adjustment device is characterized in that the first engaging and the second engaging is arranged in a two-stage structure on the same surface of the liner, the number of the second engaging than the first engaging is characterized in that the configuration. .

According to such a vehicle seat height adjustment device of the present invention, by reducing the torque transmission path from the input shaft to the output shaft it is possible to increase the operating efficiency.

In addition, according to the present invention, by eliminating or minimizing the role of the clutch drum in the torque transmission path from the input shaft to the output shaft, it is possible to omit the expensive heat treatment process that is conventionally performed on the clutch drum, reducing the manufacturing cost and process time It becomes possible.

1 and 2 are an exploded perspective view and a side cross-sectional view showing a vehicle seat height adjustment apparatus according to the present invention.
3 and 4 are cross-sectional views illustrating lines A-A 'and B-B' of FIG. 2.

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 show a vehicle seat height adjustment device according to the invention, Figures 3 and 4 are shown the operating relationship of the vehicle seat height adjustment device according to the invention, respectively.

1 and 2, the seat height adjustment apparatus 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 a configuration for torque transmission, the input shaft 4 is inserted into the inside of the front housing (1) and one end is fixedly coupled to the lever bracket (3), and frictional contact with the outer peripheral surface of the input shaft (4) And a clutch drum 8 which rotates in conjunction with the rotation of the input shaft 4 through frictional contact with the torque transmission unit 7.

In addition, the clutch unit (A) is a configuration for return, the first clutch spring 6a for elastically supporting the stop leg (3b) of the lever bracket (3), the second clutch for elastically supporting the torque transmission portion (7) It further comprises a spring stopper member (5) containing a spring (6b), said first and second clutch spring (6a, 6b).

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. Thus, a stop leg 3b is formed extending through the guide slot 1d of the front housing 1 to the position of the first clutch spring 6a in the spring stopper member 5.

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 11 is inserted is formed. In this case, a plurality of concave curved or planar cam surfaces 4a are radially formed on the outer circumferential surface of the rear end of the input shaft 4, and a plurality of such cam surfaces 4a are formed at regular intervals on the outer circumferential surface of the input shaft 4. .

The torque transmission part 7 includes a cylindrical retainer 7c surrounding an outer circumferential surface of the input shaft 4, and a plurality of engaging members accommodated in the retainer 7c and in contact with the cam surface 4a of the input shaft 4. 7a, 7b).

The retainer 7c has a cylindrical structure surrounding the outer circumferential surface of the input shaft 4, and a plurality of receiving grooves are formed in the rim to accommodate a plurality of engaging members 7a and 7b. At this time, the plurality of engaging members (7a, 7b) is configured to be accommodated in a two-stage structure in the axial direction on the edge of the retainer (7c). That is, the first engaging member 7a is accommodated in the front end of the retainer 7c, and the second engaging member 7b is accommodated in the rear end of the retainer 7c, and the first and second engaging members ( Both 7a and 7b are in frictional contact with the cam face 4a of the input shaft 4.

These engaging members 7a and 7b are constrained by the cam surface 4a, so that they move together with the cam surface 4a when the input shaft 4 rotates, and may have a ball or roller shape, and other shapes are possible. .

On the other hand, the first engaging member 7a is in frictional contact between the front end of the cam surface 4a and the inner circumferential surface of the clutch drum 8, thereby transmitting the torque of the input shaft 4 to the clutch drum 8. In addition, the second engagement member 7b is in frictional contact between the rear end of the cam surface 4a and the inner circumferential surface of the output member 10, thereby transmitting the torque of the input shaft 4 to the output member 10.

Here, the number of first and second engagements 7a and 7b coupled to the retainer 7c may be configured differently. For example, ten second engaging members 7b are arranged at the rear end of the outer circumferential surface of the retainer 7c at regular intervals, and five first engaging members 7a are arranged at the front end of the second engaging member 7b. It may be configured to be arranged at regular intervals. At this time, it is preferable that 10 cam surfaces 4a formed on the outer circumferential surface of the input shaft 4 are formed to correspond one-to-one with the second engagement member 7b.

In addition, at the front end of the retainer 7c, a support protrusion 7d, in which both ends of the second clutch spring 6b are contacted and supported, is formed to protrude in the axial direction, and the second clutch spring 6b is rotated during the rotation of the input shaft 4. ) Can be elastically compressed by the support projection (7d).

Meanwhile, the rear end of the input shaft 4 on which the cam surface 4a is formed is located at the center of the clutch drum 8, and the press surface (a frictional contact with the first engaging member 7a is in contact with the inner peripheral surface of the center of the clutch drum 8). 8a) is formed. That is, the first engaging member 7a is inserted between each cam surface 4a formed on the outer circumferential surface of the input shaft 4 and the pressing surface 8a of the clutch drum 8, and this first engaging member 7a is inserted. Are in contact with the cam face 4a of the input shaft 4 and the pressing face 8a of the clutch drum 8, respectively.

Therefore, in the rotation process of the input shaft 4, the first engaging member 7a is in frictional contact with the cam surface 4a of the input shaft 4 and the pressing surface 8a of the clutch drum 8, respectively, whereby the input shaft 4 Rotational torque of the c) can be transmitted to the clutch drum (8) via the first engagement (7a).

In addition, a shaft hole is formed through the center of the clutch drum 8, and a plurality of protruding legs 8b protruding in the axial direction are formed on the outer circumferential surface thereof, and the protruding legs 8b protrude on the outer circumferential surface of the output member 10. By being inserted between the formed wedge boss 10a, the rotational force of the clutch drum 8 can be transmitted to the output member 10.

In addition, the spring stopper member 5 has a shaft hole formed at a central portion thereof so that the rear end of the input shaft 4 can pass therethrough, and a ring-shaped groove in which the first clutch spring 6a is seated is formed at the front edge thereof, and the rear edge thereof. A groove in the form of a ring on which the second clutch spring 6b is seated is formed. That is, at the outer edge of the spring stopper member 5, a ring-shaped groove is opened in the direction of the front housing 1 to seat the first clutch spring 6a, and the front edge is formed at the inner edge of the spring stopper member 5. Opening in the opposite direction of the housing 1 is formed with a ring-shaped groove in which the second clutch spring 6b is seated.

At this time, the first clutch spring (6a) is compressed in the rotational direction by the stop leg (3b) of the lever bracket (3) rotated in either direction, and when the rotational force disappears, the lever bracket (3) returns to its original position Provides resilience that can be achieved.

That is, when the lever bracket 3 is rotated using the handle lever, the first clutch spring 6a is compressed in the rotational direction by the stop leg 3b of the lever bracket 3, and then the lever bracket 3 is applied to the lever bracket 3. When the applied rotational force is released, the lever bracket 3 rotates in the reverse direction and returns to the initial position by the elastic restoring force of the first clutch spring 6a which has been compressed. At this time, the input shaft 4, one end of which is fixed to the lever bracket 3, also rotates in the reverse direction to return to the initial position.

In addition, the second clutch spring 6b is compressed in the rotational direction by the support protrusion 7d of the torque transmission unit 7 which is rotated in either direction, and when the rotational force is extinguished, the retainer 7c is returned to its original position. Provide resilience.

That is, when the retainer 7c is rotated by frictional contact between the cam surface 4a and the engaging members 7a and 7b while the input shaft 4 rotates, the second clutch spring ( 6b) is compressed in the rotational direction, and the retainer 7c rotates in the reverse direction to return to the initial position by the elastic restoring force of the second clutch spring 6b which has been compressed. At this time, the clutch drum 8 in friction contact with the first engagement member 7a and the output member 10 in friction contact with the second engagement member 7b are also rotated in the reverse direction to return to the initial position.

As described above, the clutch unit A according to the present invention is composed of two clutch means according to the torque transmission path.

The first clutch means consists of a path through which torque is transmitted in the order of the input shaft 4, the cam surface 4a, the second engagement member 7b, the output member 10 and the output shaft 11, and such first clutch means. According to the present invention, since the clutch drum 8 is excluded from the torque transmission path, the torque transmission path is shortened to increase the operating efficiency, and it is not necessary to perform a separate heat treatment process for the frictional contact of the clutch drum 8. .

The second clutch means comprises a path through which torque is transmitted in the order of the input shaft 4, the cam surface 4a, the first engaging member 7a, the clutch drum 8, the output member 10, and the output shaft 11. Since this second clutch means is only an auxiliary role of the first clutch means, it is also possible to minimize or minimize the need for a separate heat treatment process for frictional contact of the clutch drum 8 even in this case.

As such, most of the torque is transmitted through the first clutch means in which the clutch drum 8 is excluded from the torque transmission path, and the second clutch means in which the clutch drum 8 is included in the torque transmission path is merely an auxiliary of the first clutch means. In order to perform only a role, it is preferable that the retainer 7c is configured to have a greater number of second engaging members 7b than the first engaging members 7a.

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 to 4, the brake unit (B) is coupled to the output member 10 and the output member 10, which forms a wedge boss (10a) protruding on the outer peripheral surface of the body, the rear cover An output shaft 11 having an output gear 11a which is pulled out into the shaft hole 2a of (2) and engaged with the link-side sector gear, and is located on the output member 10 side and is braked by a frictional force against the front housing 1; It comprises a roller member 12 for generating a.

In the present embodiment, the output member 10 forms a latch hole at the center of the shaft, and the output shaft 11 is latched to each other by forming a latch, but the output member 10 and the output shaft 11 are integrally formed by a forced press. It may have a structure.

On the outer circumferential surface of the output member 10, a plurality of wedge bosses 10a are formed to protrude at regular intervals, and the protruding legs 8b of the clutch drum 8 are inserted between the wedge bosses 10a. In addition, a roller position surface 10c into which the first and second roller shafts 12a and 12b of the roller member 12 are inserted is formed on the outer circumferential surface of the output member 10 with each wedge boss 10a interposed therebetween. And between the roller position surface 10c is connected to the restraint section surface 10d protruding from the outer peripheral surface of the body of the output member (10).

The restraint section surface 10d reduces the distance between the front housing 1 and the output member 10 to implement a wedge action on the roller member 12, thereby restraining the output member 10 with a strong brake force to output the shaft. It becomes possible to prevent the rotation of (11).

In addition, a friction surface 10b is formed on the inner circumferential surface of the output member 10 in frictional contact with the second engagement member 7b of the torque transmission unit 7b. That is, a second engagement member 7b is inserted between each cam surface 4a formed on the outer circumferential surface of the input shaft 4 and the friction surface 10b of the output member 10, and such second engagement member 7b is inserted. Are in contact with the cam surface 4a of the input shaft 4 and the friction surface 10b of the output member 10, respectively.

Accordingly, in the rotation process of the input shaft 4, the second engagement member 7b is in frictional contact with the cam surface 4a of the input shaft 4 and the friction surface 10b of the output member 10, respectively, thereby providing an input shaft 4. The rotation torque of) can be transmitted to the output member 10 through the second engaging member 7b.

Meanwhile, as described above, the protruding leg 8b of the clutch drum 8 is inserted between the wedge bosses 10a of the output member 10, whereby the clutch drum 8 and the output member 10 interlock with each other to rotate. Done. At this time, the friction washer 9 is further provided between the clutch drum 8 and the output member 10 in order to further prevent abrasion and rotational interworkability due to friction between the clutch drum 8 and the output member 10. It is desirable to be.

The output shaft 11 has an output shaft 11b whose front end is inserted into the shaft hole 1a of the front housing 1 and has an output gear 11a bited by the link-side sector gear at the rear end thereof and exits out of the rear cover 2. ) And a latch shaft having a latch coupled to the latch hole of the output member 10 in the extension shaft 11b.

The output gear 11a 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 12 according to the present invention is located between the paired first and second roller shafts 12a and 12b and the first and second roller shafts 12a and 12b, and the first roller shaft 12a and It consists of the insert spring 12c which pushes out the 2nd roller shaft 12b, respectively.

The insert spring 12c surrounds the wedge boss 10a of the output member 10 and has a structure pushing the first and second roller shafts 12a and 12b positioned on both sides thereof. Make it.

As shown, the first and second roller shafts 12a and 12b, which are assembled to the roller position surface 10c on the side of the wedge boss 10a of the output member 10 and are pushed out of the insert spring 12c, By restraining the movement through the constraining section surface 10d protruding from the roller position surface 10c, the rotation of the output member 10 can be constrained.

The roller member 12 may be formed as a pair of first and second roller shafts 12a and 12b and the insert spring 12c, and may be configured in units 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 fixing of the brake unit B is released through the torque transmission paths of the first clutch means and the second clutch means.

First, the torque transmission path according to the first clutch means will be described.

When the input shaft 4 rotates, the retainer 7c also rotates about the input shaft 4 due to the engaging members 7a and 7b in contact with the cam surface 4a of the input shaft 4. At this time, the output member 10 is rotated by the frictional contact between the second engagement member 7b and the friction surface 10b to release the fixing of the brake unit B. FIG.

That is, the output member 10 subjected to the strong push of the second engaging member 7b rotates in the same direction as the input shaft 4, and the output shaft 11 fixedly coupled to the output member 10 is also input shaft 4. Rotate in the same direction as. Subsequently, the output gear 11a fixed to the output shaft 11 is rotated in the same direction by the rotation of the output shaft 11, and the rotation of the output gear 11a 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.

Next, look at the torque transmission path according to the second clutch means.

When the input shaft 4 rotates, the retainer 7c also rotates about the input shaft 4 due to the engaging members 7a and 7b in contact with the cam surface 4a of the input shaft 4, wherein As the clutch drum 8 rotates by frictional contact between the one engaging member 7a and the pressing surface 8a, the fixing of the brake unit B is released.

That is, the clutch drum 8, which is subjected to the strong push of the first engaging member 7a, moves the roller member 12 while rotating in the same direction as the input shaft 4, through which the clutch drum 8 outputs the output member. The state in which the (10) side can be rotated is switched.

Then, the rotation of the clutch drum 8 causes the protruding leg 8b to press the second roller 12b located in the rotational direction of the roller member 12, and the second roller 12b pushed by the pressing force. Compresses and deforms the insert spring 12c fitted to the wedge boss 10a.

As described above, the second roller 12b is moved from the restraint section surface 10d toward the roller position surface 10c, whereby the frictional force between the front housing 1 and the clutch drum 8 is greatly weakened or released. .

In this state, the rotation of the clutch drum 8 rotates the output member 10 in the same direction, and the rotation of the output member 10 causes the output shaft 11 fixed to the output member 10 to rotate in the same direction. do.

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 first and second clutch springs 6a and 6b, and at the same time, the brake unit B Switch back to the locked state.

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

When the lever bracket 3 is rotated in the reverse direction by the elastic restoring force of the first clutch spring 6a that elastically supports the stop leg 3b of the lever bracket 3, the tip thereof is fixed to the lever bracket 3. The input shaft 4 can also be rotated in the reverse direction to return to the initial state.

In addition, when the retainer 7c rotates in the reverse direction by the elastic restoring force of the second clutch spring 6b that elastically supports the support protrusion 7d of the retainer 7c, the clutch drum is in frictional contact with the first engaging member 7a. (8) also rotates in the reverse direction to return to the initial position, and also the output member 10 in frictional contact with the second engaging member (7b) 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 retainer 7c is rotated in the reverse direction when the handle lever is operated by the elastic restoring force of the second clutch spring 6b, the load of the clutch drum 8 with respect to the roller member 12 is released and the insert is compressed. The second roller 12b subjected to the elastic restoring force of the spring 12c is moved back from the roller position surface 10c side of the output member 10 toward the restraint section surface 10d, and is switched to the initial state.

The return of the initial state of the roller member 12 implements a wedge action, which is a brake force that forms a strong friction force between the front housing 1 and the output member 10, and thus the output shaft 10 on the link side through a load applied to the seat. The rotational force transmitted to) is blocked at the output member 10 constrained with respect to the front housing 1, thereby allowing the seat to be fixed while adjusting the height.

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 4a: Cam surface
5: spring stopper member 6a: first clutch spring
6b: 2nd clutch spring 7: Torque transmission part
7a: first mate 7b: second mate
7c: Retainer 7d: Supporting protrusion
8: clutch drum 8a: pressing surface
8b: protruding leg 9: friction washer
10: output member 10a: wedge boss
11: output shaft 11a: output gear
12 roller 12a first roller shaft
12b: 2nd roller shaft 12c: insert spring
A: Clutch Unit B: Brake Unit

Claims (7)

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 to rotate according to an external input and having a plurality of curved or planar cam surfaces concave on an outer circumferential surface at regular intervals;
A plurality of second engagement members disposed on the cam surface;
A retainer accommodating the second engagement member and rotating in linkage with an outer circumferential surface of the input shaft;
A first engagement member accommodated in the retainer and disposed on the cam surface;
An output member having a friction surface in frictional contact with the second engagement member formed at an inner circumferential surface of a central portion;
A clutch drum having a pressurizing surface in frictional contact with the first engagement portion formed at an inner circumferential surface of the central portion, the clutch drum rotating in cooperation with an output member;
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.
When the input shaft rotates, the second engaging members disposed on each cam surface rotate, and the output member rotates by frictional contact between the second engaging member and the friction surface,
When the input shaft is rotated, the first engagement device disposed on each cam surface rotates, the clutch drum height adjustment device characterized in that the clutch drum is rotated by the frictional contact between the first engagement and the pressing surface. delete The method of claim 1,
Wedge boss protruding at a predetermined interval from the edge of the output member;
A protruding leg formed to protrude rearward from an edge of a clutch drum and inserted between the wedge bosses;
Vehicle seat height adjustment device, characterized in that further comprises. The method according to claim 1 or 3,
A support protrusion protruding in the axial direction from the front end of the retainer;
A second clutch spring that elastically supports the support protrusion to provide an elastic restoring force for returning the retainer to an initial position;
A spring stopper member on which the second clutch spring is seated on an edge inner circumferential surface;
Vehicle seat height adjustment device further comprising a. The method of claim 4, wherein
One end of the input shaft is fixedly coupled, the lever bracket having a stop leg protruding in the axial direction;
A first clutch spring elastically supporting the stop leg and seated on an inner circumferential surface of the spring stopper member to provide an elastic restoring force for returning the lever bracket to an initial position;
Vehicle seat height adjustment device further comprising a. The method of claim 5,
The outer edge of the spring stopper member is formed in a ring-shaped groove that is opened in the front housing direction to seat the first clutch spring, and the inner edge of the spring stopper member is opened in the opposite direction of the front housing to ring the second clutch spring. Vehicle seat height adjustment device, characterized in that the groove is formed. The method according to claim 1 or 3,
The first engaging member and the second engaging member is arranged in a two-stage structure on the same surface of the liner, the vehicle seat height adjustment device characterized in that the number of the second engaging member is configured to be larger than the first engaging member.

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