KR20120102206A - An appratus for moving a car seat - Google Patents

Abstract

PURPOSE: A vehicle seat moving device is provided to minimize the axial clearance or the lateral movement of the lead screw and reduce the weight of a lead nut assembly and improve the productivity through simple assembling process. CONSTITUTION: A vehicle seat moving device comprises a gear box(30), a lead screw(40), a lead nut assembly(50), and a leaf spring. The gear box accommodates a worm gear(31) and a worm wheel(32). The lead screw comprises a male thread(40a) on the exterior and is rotated with the worm wheel. The lead nut assembly is composed to be moved along the axial direction of the lead screw by the rotation of the lead screw. The leaf spring is accommodated in the gear box and prevents the unintended movement of the lead screw by pushing the end portion of the lead screw to the lead nut assembly.

Description

Seat transfer device for vehicle {AN APPRATUS FOR MOVING A CAR SEAT}

The present invention relates to a seat transfer apparatus for a vehicle, and more particularly, to a seat transfer apparatus for a vehicle to minimize axial play and minimize shaking of a lead screw for transfer.

In general, the vehicle seat is to be able to transfer a predetermined distance in front and rear to secure a proper space in the passenger sitting state, there are a manual type to be moved back and forth by manual operation, and an electric type to be transferred by an electric motor. Recently, there is also an automatic type that is automatically adjusted by pre-input information according to the driver's body type.

1 is a schematic view of a general vehicle seat conveying apparatus, which is installed at a lower portion of a vehicle seat so that the seat can be moved in the front-rear direction by a passenger. As shown in FIG. 1, the vehicle seat transfer apparatus includes a drive motor 1, a worm shaft 2, a gear box 3, a lead screw 4, and a lead nut assembly 5. One end of the worm shaft 2 is connected to the drive motor 1 to rotate according to the operation of the drive motor 1, and a worm gear (see 31 in FIG. 2) is formed at the other end. To be seated in the gearbox 3.

Meanwhile, in the gearbox 3, a worm wheel (see 32 in FIG. 2) interlocked with the worm gear is seated, and the worm wheel is connected to the lead screw 4, so that the worm wheel and the lead screw are rotated by the worm gear. (4) will rotate. The male screw thread 4a is formed in the outer periphery of the lead screw 4 in the longitudinal direction. A through nut is formed in the lead nut assembly, and a female thread is formed in the inner circumference of the through hole. The male screw thread 4a of the lead screw 4 is engaged with the female screw thread of the through nut assembly 5 through hole. As 4) rotates, the lead nut assembly 5 is moved relative to the lead screw 4 in the axial direction.

Thus, when the gear box 3 is fixedly attached to the bottom of the vehicle seat (not shown) and the lead nut assembly 5 is fixedly attached to the vehicle body (not shown), the worm gear is operated by the operation of the drive motor 1. And the lead screw 4 is rotated through the worm wheel and the gear box 3 is moved in the front and rear direction of the vehicle body. Alternatively, the lead nut assembly 5 may be fixedly attached to the bottom surface of the vehicle seat, and the gear box 3 may be fixedly attached to the vehicle body so that the lead nut assembly 5 may move in the front-rear direction of the vehicle body.

Conventionally, since the lead nut assembly 5 is made of an integral steel, the weight of the lead nut assembly 5 may be high, and operation noise between the lead screw and the lead nut, which is a steel material, may occur. In order to solve this problem, an outer cover of the lead nut assembly is made of steel, and a method of assembling a plastic with a female thread in the inner through hole inside the outer cover has been proposed. There is a problem that the sheet shakes during the transfer.

Also, in order to prevent shaking of the worm wheel and the lead screw 4 in the gear box 3, the end of the lead screw 4 in the gear box may be pushed using a set screw and a ball. However, the assembly time of the set screw is long, the ball closing position is inclined due to the assembly position and angle of the set screw, and the lead screw 4 may be shaken, and the play may be increased by loosening the set screw during operation. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its main object is to provide a seat transfer apparatus for a vehicle with smooth transfer of seats by minimizing axial play and transverse shaking of the lead screw.

Another object of the present invention is to provide a vehicle seat conveying apparatus which is light in weight and low in operation.

In addition, another object of the present invention is to provide a vehicle seat transfer apparatus that can be easily assembled and increase the productivity.

Vehicle seat conveying apparatus according to the present invention for achieving the above object, a gear box for receiving a worm gear and a worm wheel, connected to the worm wheel and rotates with the worm wheel, a lead screw provided with a male thread on the outer circumference, and the inner circumference A lead nut assembly having a female thread formed therein, the lead screw penetrating into the through hole, the lead nut assembly being movable relative to the axial direction of the lead screw according to the rotation of the lead screw; It includes an outer cover and the inner nut, the inner nut is insert injection molded in the outer cover is characterized in that there is no gap between the outer cover and the inner nut.

The outer cover of the lead nut assembly may be made of aluminum, and the inner nut of the lead nut assembly may be made of plastic. As a result, weight reduction and operation noise reduction can be achieved.

In addition, when the inner nut of the lead nut assembly is injection molded, it is preferable that the internal thread of the inner nut is also molded.

Meanwhile, stoppers may be further provided at both ends of the lead nut assembly in the axial direction of the lead screw, and the stopper may be injection molded as the inner nut is injection molded from plastic.

Here, the gearbox is fixedly attached to the vehicle seat, the lead nut assembly may be fixedly attached to the vehicle body, on the contrary, the lead nut assembly is fixedly attached to the vehicle seat, and the gearbox is fixedly attached to the vehicle body May be

On the other hand, the seat transfer apparatus for a vehicle according to the present invention includes a gear box for receiving a worm gear and a worm wheel, connected to the worm wheel to rotate like the worm wheel, a lead screw having a male thread on the outer circumference, and a female thread on the inner circumference. A lead nut assembly having a hole formed therein, the lead screw penetrating into the through hole, the lead nut assembly being movable relative to the axial direction of the lead screw according to the rotation of the lead screw, and the leaf spring is mounted in the gear box. To push the end of the lead screw toward the lead nut assembly, it is characterized in that the lead screw is not shaken.

A central convex portion protruding convexly toward the lead screw is formed at a portion in contact with the lead screw end of the leaf spring, and a plurality of peripheral convex portions protruding convexly opposite to the central convex portion are formed around the central convex portion. It is preferably formed in contact with the inner surface of the gearbox, by pushing the end of the lead screw toward the lead nut assembly by elasticity.

In addition, it is preferable that the V-shaped groove is further formed at the end of the lead screw, and the central convex portion is in close contact with the V-shaped groove.

In addition, the central convex portion and the peripheral convex portion may be made of one of a hemispherical shape, a truncated cone shape, a cone shape, a square pyramid shape, or a combination thereof.

Meanwhile, the assembly tolerance between the inner surface of the gear box on which the worm wheel is seated and the front and rear surfaces of the worm wheel is preferably managed within 0.05 to 0.2 mm.

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The seat transfer apparatus for a vehicle according to the present invention provides the following effects.

-The axial play of the lead screw is minimized, so the sheet movement is smooth and smooth.

-The movement of the seat is smooth and smooth due to less lateral shaking of the lead screw.

-The weight of the lead nut assembly can be reduced to reduce the weight of the vehicle seat conveying device.

-When manufacturing the lead nut assembly, the assembly process can be omitted by using the insert injection molding method, and the female thread processing can be omitted by injection molding the female thread of the lead nut.

-It is easy to assemble the vehicle seat conveying device and it takes less time, and it is possible to improve the quality of assembly.

1 is a schematic diagram of a general vehicle seat transfer apparatus.
2 is a schematic perspective view of a lead nut assembly, a lead screw and a gear box assembled according to the present invention.
3 is a side view of the lead nut assembly according to the present invention.
4 is a axial play comparison graph of the lead nut assembly and the conventional product according to the present invention.
5 is a schematic view showing a state in which the leaf spring according to the present invention is assembled in the gearbox.
6A is a perspective view of a leaf spring according to the present invention.
Figure 6b is a cut perspective view of the leaf spring according to the present invention.
7 is an enlarged cross-sectional view of a leaf spring according to the present invention assembled into a gearbox.
8 is a comparative graph of the lateral shaking of the lead screw in the product and the existing product to which the leaf spring is applied according to the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described for the vehicle seat transfer apparatus according to a preferred embodiment of the present invention, which is illustrative and does not limit the present invention.

2 and 3, the vehicle seat transfer apparatus according to the present invention includes a gearbox 30, a lead screw 40, and a lead nut assembly 50.

The worm gear 31 and the worm wheel 32 are accommodated and seated in the gearbox 30, and the worm gear 31 and the worm wheel 32 are engaged in such a manner that their axes cross each other.

The lead screw 40 is concentrically connected to the worm wheel 32 in the form of a shaft and rotates together, and a male thread 40a is formed on the outer circumference of the lead screw 40.

Meanwhile, the lead nut assembly 50 includes an outer cover 51 and an inner nut 52, and the inner nut 52 is injection molded into the outer cover 51, that is, the outer cover ( 51) is inserted into an injection mold and molded into the molten resin such as plastic. By doing so, a gap does not occur between the outer cover 51 and the inner nut 52, so that the clearance problem between the outer cover 51 and the inner nut 52, which has occurred in the conventional prefabricated lead nut assembly, is solved.

Figure 3 is a detailed side view of the lead nut assembly 50 according to the present invention, both ends of the outer cover 51 in the axial direction of the lead screw 40 may be further provided with a stopper 53, the stopper 53 can be molded together when the inner nut 52 is injection molded. On the other hand, a hollow through hole is formed in the outer cover 51 and the stopper 53, and a hollow through hole and a female thread 52a are formed in the inner nut 52. Here, the female thread 52a is preferably molded simultaneously when the inner nut 52 is injection molded. In this way, the step of assembling the inner nut 52 in the outer cover 51 of the lead nut assembly 50 can be omitted, and the internal thread processing on the inner nut 52 after molding can be omitted, thereby improving productivity. It can increase.

On the other hand, a fastening hole 51a for fastening to the vehicle body or the vehicle seat is formed on the lower surface or the upper surface of the outer cover 51. Although shown in the drawings in two, this may vary in quantity as needed.

Referring back to FIG. 2, one side of the lead screw 40 is connected to the worm wheel 32 in the gearbox 30, and the male thread 40a of the lead screw 40 is an inner nut of the lead nut assembly 50. In engagement with the female screw thread (52a in FIG. 3) of 52, the lead nut assembly 50 is installed to be penetrated by the lead screw 40. As shown in FIG.

Thus, the gearbox 30 is fixedly attached to the bottom of the vehicle seat, and the worm gear 31 is rotated by the drive motor (see 1 in FIG. 1) while the lead nut assembly 50 is fixedly attached to the frame of the vehicle body. When the worm wheel 31 meshes with the worm gear 31, the lead screw 40 connected to the worm wheel 32 also rotates about the axis of the lead screw 40. At this time, since the male thread 40a of the lead screw 40 is engaged with the female thread 52a of the lead nut assembly 50, relative movement in the axial direction occurs, and the lead nut assembly 50 is fixed to the frame of the vehicle body. Since it is attached, the gearbox 30 moves forward or backward along the axis of the lead screw 40, and the sheet fixedly attached thereto moves forward or backward. If the gear box 30 is fixedly attached to the frame of the vehicle body and the lead nut assembly 50 is fixedly attached to the bottom of the vehicle seat, the lead nut assembly 50 is moved forward or along the axis of the lead screw 40. By moving backward, the sheet connected to the lead nut assembly 50 is moved forward or backward.

Meanwhile, as described above, the stopper 53 may be provided at both ends of the lead nut assembly 50 to limit the movement of the vehicle seat within an appropriate range.

Here, the outer cover 51 of the lead nut assembly 50 is made of a hard metal material such as aluminum, and the inner nut 52 is made of a plastic material having high strength and high durability, for example, an engineering plastic material, so that the weight can be reduced. In addition, it is possible to reduce noise caused by friction between the male screw thread 40a of the lead screw 40 and the female screw thread 52a of the lead nut assembly 50 during sheet transfer. Here, the outer cover 51 may be manufactured by cutting an extruded elongated aluminum product.

4 is a graph showing the results of the axial play test of the lead screw 40 in the product equipped with the lead nut assembly 50 and the existing product according to the present invention. In the case of the axial play is about 0.09 to 0.22 mm, in the product equipped with the lead nut assembly 50 according to the present invention it can be seen that it is very reduced to about 0.04 to 0.1 mm. Therefore, the seat transfer apparatus for a vehicle equipped with the lead nut assembly 50 according to the present invention can be seen that there is almost no play so that the sheet can be transferred very smoothly.

Meanwhile, in order to prevent the axial movement of the worm wheel (see 32 in FIG. 2) and the transverse shaking of the lead screw (see 40 in FIG. 2) assembled in the gearbox (see 30 in FIG. 2), It is also possible to use the set screw and ball to push the end of the lead screw in the axial direction of the lead screw.It is difficult to accurately set the set screw and the ball to the end of the lead screw. There is a problem that the tilt of the lead screw is increased due to the inclination, the set screw is released during the sheet conveying operation to increase the axial play of the worm wheel. Therefore, according to the present invention, it is possible to reduce the axial play of the worm wheel by using a leaf spring instead of the set screw and the ball, and to minimize the shaking of the lead screw during operation. Details thereof will be described with reference to FIGS. 5 to 8.

5 shows a state in which the leaf spring 33 according to the present invention is assembled to the end portion 40b of the lead screw 40 in the gearbox 30, and the plate according to the present invention is shown in FIGS. 6a and 6b. A preferred embodiment of the spring 33 is shown, and in FIG. 7, a detailed cross-sectional view of the leaf spring 33 according to the present invention is in close contact with the end portion 40b of the lead screw 40 in the gearbox 30. 8, in the case where the leaf spring 33 according to the present invention is mounted and in the conventional products, the end portion of the opposite side of the lead screw 40, that is, the opposite side of the gearbox 30, is shaken. A graph plotting the measured data is shown.

Referring first to FIGS. 6A and 6B, there is shown a perspective view of a preferred embodiment of a leaf spring 33 according to the invention and a cross-sectional perspective view cut in the radial direction, as shown, the leaf spring according to the invention. 33 has a central convex portion 33a protruding convexly in the center portion, and a plurality of peripheral convex portions 33b protruding convexly protrudingly opposite to the central convex portion 33a around the central convex portion 33a. ) Is formed. In this figure, although four peripheral convex portions 33b are formed, the number of peripheral convex portions 33b may vary from two, three, five, six, and the like, and the leaf spring 33 The shapes of the convex portions 33a and 33b may also be modified differently. In particular, the central convex portion 33a and the peripheral convex portion 33b are each pressed into close contact with each other to serve as a spring, and their shapes may be variously modified such as hemispherical, conical, conical, and square pyramid. For example, the central convex portion 33a may be formed in various combinations, such as the hemispherical peripheral convex portion 33b in a truncated cone shape or the like.

Referring back to FIG. 5, the leaf spring 33 shown in FIG. 6A is installed in close contact with the end portion 40b of the lead screw 40 in the gearbox 30. The end portion 40b is preferably formed with a V-shaped groove 40c as indicated by the dotted line. The central convex portion 33a of the leaf spring 33 is pressed against the V-shaped groove 40c, and the peripheral convex portions 33b of the leaf spring 33 are pressed against the inner surface 34 of the rear side of the gearbox. do. Thus, the elastic force of the leaf spring 33 pushes the end portion 40b of the lead screw 40 toward the lead nut assembly (see 50 in FIG. 2). As a result, the worm wheel 32 fixedly connected to the lead screw 40 is also pushed toward the lead nut assembly, so that the movement in the gearbox 30 is reduced, and the lateral shake of the lead screw 40 is reduced. In addition, assembling is simpler than mounting a conventional set screw, ball, or the like.

7 is a cross-sectional view showing an enlarged portion of the leaf spring 33 according to the present invention mounted on the end portion 40b of the lead screw 40 in the gearbox 30. The center convex of the leaf spring 33 is shown. The portion 33a is pressed against the V-shaped groove 40c formed in the end portion 40b of the lead screw 40, and the peripheral convex portion 33b of the leaf spring 33 is formed on the inner surface 34 of the rear side of the gearbox. It may be well understood that the lead screw 40 is pushed in the opposite direction of the leaf spring 33 by the elastic force of the leaf spring 33.

In addition, it is preferable that the tolerance management between the inner surface of the gear box 30 on which the worm wheel 32 is seated and the front and rear surfaces of the worm wheel 32 is managed within 0.05 to 0.2 mm.

 On the other hand, with respect to the product equipped with the leaf spring 33 according to the present invention and the five existing products, the probe sensor (in the vicinity of the opposite end of the lead screw, that is, near the opposite end of the end portion 40b of the lead screw 40) As a result of measurement using a probe sensor), a graph as shown in FIG. 8 was obtained.

In the graph of Fig. 8, the lines ① and ② are the test results for the product equipped with the leaf spring 33 according to the present invention, and the line ① is the case where the lead screw 40 is tested in the forward direction. , ② is the case where the lead screw 40 is tested in the reverse direction. On the other hand, lines ③ through ⑦ are the test results for the existing products A, B, C, D and E, respectively.

As shown in the graph of FIG. 8, in the conventional products A, B, C, D, and E, the shake measurement value is 0.218 to 1.194 mm, and the shake amount is large and the deviation according to the test frequency is large, whereas the leaf spring according to the present invention (33) ), The shake of 0.117 to 0.127 mm was measured when the lead screw 40 moved forward, and the shake of 0.146 to 0.222 mm was measured when the lead screw 40 moved backward. The amount of shaking was much lower than that of the product, and the variation according to the number of tests was very small. Therefore, the seat transfer apparatus for a vehicle equipped with the leaf spring 33 according to the present invention can transfer the sheet very smoothly with little shaking.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And it is also within the scope of the present invention.

1: drive motor 2: worm shaft
3: gearbox 4: lead screw
4a male thread 5 lead nut assembly
30: gear box 31: worm gear
32: worm wheel 33: leaf spring
33a: central convex part 33b: peripheral convex part
34: rear side of gearbox 40: lead screw
40a: Male thread 40b: Lead screw end
40c: V-shaped groove 50: Lead nut assembly
51 outer cover 51a fastening hole
52: inner nut 52a: female thread
53: stopper

Claims (7)

A gear box for receiving a worm gear and a worm wheel; A lead screw connected to the worm wheel and rotating together with the worm wheel, the male screw being provided on an outer circumference thereof; A lead nut assembly having a through hole provided with a female thread in an inner circumference thereof and having the lead screw penetrated into the through hole, the lead nut assembly being capable of relative movement in the axial direction of the lead screw as the lead screw rotates; In the vehicle seat transfer apparatus comprising:
A leaf spring is mounted in the gearbox, and pushes the end of the lead screw toward the lead nut assembly to prevent the lead screw from shaking.
The method of claim 1,
A central convex portion protruding convexly toward the lead screw is formed at a portion contacting the lead screw end of the leaf spring, and a plurality of peripheral convex portions protruding convexly opposite the central convex portion are formed around the central convex portion. And contact with the inner surface of the gearbox to push the lead screw toward the lead nut assembly by elasticity.
The method of claim 2,
A V-shaped groove is further formed at an end of the lead screw, and the center convex portion is in close contact with the V-shaped groove.
The method of claim 2,
The center convex portion and the peripheral convex portion is made of one of the hemispherical shape, truncated cone shape, cone shape, square pyramid shape, or a combination sheet of the vehicle characterized in that made of a combination thereof.
The method of claim 1,
The assembly tolerance between the inner surface of the gear box on which the worm wheel is seated and the front and rear surfaces of the worm wheel is 0.05 to 0.2 mm.
The method of claim 1,
The gear box is fixedly attached to the vehicle seat, the lead nut assembly is a vehicle seat transport apparatus, characterized in that fixedly attached to the vehicle body.
The method of claim 1,
The lead nut assembly is fixedly attached to the vehicle seat, and the gear box is a vehicle seat transport apparatus, characterized in that fixedly attached to the vehicle body.

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