Power rotation device for vehicle seat

Abstract

The present invention relates to a power rotating device for a vehicle seat, wherein a brake unit is provided between a fixed plate mounted on a seat track and a rotating plate mounted on the seat. The brake unit transmits the rotational force of a motor to the rotating plate, and when the motor stops, the rotational direction play of the rotating plate is suppressed. Therefore, the rotational direction play of the seat caused by gear backlash can be prevented.

Description

Technical Field

[0001] The present invention relates to a power rotating device for a vehicle seat, and more particularly to a power rotating device for automatically rotating a vehicle seat by driving the vehicle seat with a motor. Background Art

[0002] Vehicle seats are equipped with various convenience devices for providing passengers with a more comfortable ride and convenience, such as a seat rail device that can move the vehicle seat forward and backward according to the body shape of the passenger, and a leg rest device for supporting the passenger's legs.

[0003] In addition, with the recent popularization of electric vehicles, it is advantageous to secure the interior space of the vehicle, and with the significant development of autonomous driving technology, there is an increasing interest in activities other than driving performed in the interior space while driving.

[0004] Therefore, seat structures are being developed to realize various modes such as a conversation mode between passengers and a relaxation mode in addition to a normal driving mode. A typical example of this is a swivel seat whose seat direction can be freely adjusted.

[0005] This type of rotating seat is currently mainly used in the second row of multi-purpose vehicles (MPV), and the goal is to apply it to the driver's cab under the premise of practical application of fully autonomous driving technology.

[0006] A conventional power turning device for a vehicle seat has a structure in which a motor is provided on one side of two plates rotatably coupled to each other, and a drive gear meshing with an output gear of the motor is fixedly provided on the other side.

[0007] Therefore, when the motor is driven in a state where one of the two plates is fixed to the seat rail and the seat is provided on the other, the plate provided with the seat rotates, so that the direction of the seat can be adjusted as required.

[0008] However, as a gear motor having a gear box for reducing speed, the above-mentioned motor has backlash between the multiple gears inside the gear box, and there is also backlash between the final output gear of the gear box and the above-mentioned drive gear. Therefore, there is play in the rotation direction between the fixed plate and the rotating plate of the rotating device.

[0009] Therefore, rotational play occurs in the seat, which not only reduces the safety of the seat but also causes a problem of generating noise in the seat while the vehicle is running.

[0010] Prior art literature

[0011] Patent Literature

[0012] Korean Patent Publication No. 10-2019-0048405 (published on May 9, 2019) Summary of the invention

[0013] Technical issues

[0014] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a power turning device for a vehicle seat which has no rotational play, thereby improving the safety of the seat and preventing the generation of noise.

[0015] Technical Solution

[0016] The present invention for achieving the above-mentioned purpose comprises: a fixed plate fixed to a seat track of a vehicle interior floor; a swivel plate rotatably arranged on the upper part of the fixed plate and equipped with a seat; a motor arranged on the side of the fixed plate; and a brake unit arranged between the fixed plate and the swivel plate, wherein when the motor is working, the rotational force of the motor is transmitted to the swivel plate, and when the motor stops, the rotational direction movement of the swivel plate is suppressed.

[0017] A circular guide portion is formed on the fixed plate to protrude upward, and a circular guide portion is formed on the rotating plate to protrude downward. The guide portion of the fixed plate surrounds the outer side of the guide portion of the rotating plate, thereby suppressing radial movement between the fixed plate and the rotating plate.

[0018] The brake unit includes: a drum shell and a shell cover, which are combined with each other to form a component installation space inside; a brake plate, which is arranged between the drum shell and the shell cover, and has a plurality of wedge-shaped protrusions formed on the outer peripheral surface, and wedge surfaces with inclined surfaces in which the wedge-shaped protrusion side is low and the opposite side is high are formed on both side surfaces of the wedge-shaped protrusion; a wedge roller, which is provided between the wedge surface and the inner peripheral surface of the drum shell, and is clamped between the wedge surface and the inner peripheral surface of the drum shell to constrain the rotation of the brake plate when the brake plate rotates; and an elastic component, which is arranged on the inner side of a wedge groove formed on the side of the wedge-shaped protrusion, and pushes the wedge roller toward the top of the wedge surface.

[0019] A plurality of bolts are provided on one side surface of the brake plate. The bolts are exposed to the outside through the inner diameter portion of the drum housing, and the plurality of bolts are fastened to the mounting portion of the revolving plate.

[0020] A driving plate is provided between the brake plate and the outer shell cover, a plurality of operating plates are formed on the outer peripheral surface of the driving plate and are arranged between the wedge-shaped protrusions of the brake plate, a plurality of coupling plates are formed on the inner peripheral surface of the driving plate and protrude outward through the inner diameter portion of the outer shell cover, and the plurality of coupling plates are inserted into the inner diameter portion of the driving gear located outside the outer shell cover and are welded.

[0021] A plurality of bolt fastening portions facing each other are protruded and formed on outer peripheral surfaces of the drum housing and the housing cover, and the plurality of bolt fastening portions are fixed to the mounting portion of the fixing plate by bolts.

[0022] A circumferential surface is formed between the wedge surfaces on both sides of the wedge-shaped protrusions adjacent to each other on the brake plate, and the operating piece of the drive plate is formed in an arc shape having the same curvature as the circumferential surface and contacts the circumferential surface.

[0023] A mounting plate is spaced apart at the lower part of the fixing plate, a motor is mounted on the mounting plate, and an output gear of the motor is meshed with a driving gear of the brake unit.

[0024] Effects of the Invention

[0025] According to the present invention described above, the brake unit is provided between the fixed plate and the rotating plate of the rotating device, so that play in the rotation direction does not occur between the fixed plate and the rotating plate.

[0026] Therefore, the seat does not play in the rotational direction, so that the safety of the seat is improved and noise caused by the play in the rotational direction of the seat is not generated during driving.

[0027] As described above, the seat is fixed more securely and noise is not generated, thereby improving the sensory quality of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the power rotation device of the present invention.

[0029] Figure 2 It is an exploded view of the power rotation device of the present invention.

[0030] Figure 3 It is a top perspective view of a brake unit which is a main structure of the present invention.

[0031] Figure 4 It is a bottom perspective view of the brake unit.

[0032] Figure 5 is an exploded view of the above brake unit.

[0033] Figure 6 Partially enlarged views of the brake unit, (a) is a view showing a brake plate fixed state, and (b) is a view showing a brake plate released state.

[0034] Description of Reference Numerals

[0035] 10: Fixed plate 20: Rotating plate

[0036] 30: Braking unit 31: Drum housing

[0037] 32: Shell cover 33: Brake plate

[0038] 34: Driving plate 35: Driving gear

[0039] 36: side panel 40: motor

[0040] 43: Output gear 50: Mounting plate DETAILED DESCRIPTION

[0041] The present invention may be subjected to various changes and various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, it should be understood that this does not limit the present invention to specific embodiments, but also includes all changes, equivalents and substitutes included in the concept and technical scope of the present invention. The thickness of the lines shown in the drawings or the size of the components are sometimes exaggerated for the clarity and convenience of the description.

[0042] In addition, the terms described below are defined in consideration of the functions of the present invention, and these terms may differ depending on the intention of the user or operator or on precedents. Therefore, the definitions of these terms should be based on the entire contents of this specification.

[0043] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0044] like Figure 1 and Figure 2 As shown, the power rotation device of the vehicle seat of the present invention includes: a fixed plate 10, fixed to the seat track of the interior bottom surface of the vehicle; a rotating plate 20, fixed to the lower part of the seat and rotatably arranged on the upper part of the above-mentioned fixed plate 10; a braking unit 30, arranged between the above-mentioned fixed plate 10 and the rotating plate 20, to prevent the rotating plate 20 from wandering in the rotation direction; and a motor 40, arranged on the side of the above-mentioned fixed plate 10, to provide a rotational force to the above-mentioned rotating plate 20 through the braking unit 30.

[0045] The fixing plate 10 is substantially rectangular in shape and fixed to the upper rail of the seat rail, which is provided on the floor of the vehicle. A circular through hole 11 is formed in the center of the fixing plate 10 so that the driving gear of the brake unit 30 can protrude downward, and a mounting portion 12 for mounting the brake unit 30 is formed around the through hole 11.

[0046] The mounting portion 12 is a peripheral portion of the through hole 11 , and is formed with a plurality of bolt holes so that a bolt fastening portion formed around the brake unit 30 can be mounted.

[0047] In addition, a circular guide portion 13 is formed on the upper surface of the fixing plate 10 around the mounting portion 12 and is concentric with the through hole 11 and the mounting portion 12. The guide portion 13 is formed of a plurality of curved surfaces and is formed to protrude upward from the fixing plate 10 as a whole.

[0048] The swivel plate 20 is fixedly assembled at the lower part of the seat and is a rectangular plate-type component having a shape and area similar to those of the fixed plate 10 .

[0049] A circular through hole 21 is also formed in the center of the swing plate 20, and a mounting portion 22 is formed around the through hole 21. A plurality of bolt holes are formed in the mounting portion 22. The brake plate of the brake unit 30 is fixed to the mounting portion 22 of the swing plate 20 by bolts.

[0050] In addition, in the rotating plate 20, a circular guide portion 23 is also formed on the peripheral portion of the mounting portion 22, which is concentric with the through hole 21 and the mounting portion 22. Although the guide portion 23 of the rotating plate 20 is also composed of a plurality of curved surfaces, it is formed to protrude downward from the rotating plate 20 in correspondence with the guide portion 13 of the fixed plate 10.

[0051] The guide portion 13 of the fixed plate 10 is formed with a larger diameter than the guide portion 23 of the revolving plate 20 , so that the guide portion 13 of the fixed plate 10 can surround the guide portion 23 of the revolving plate 20 from the outside when the fixed plate 10 and the revolving plate 20 are assembled by the brake unit 30 .

[0052] Therefore, when the seat is rotating, the swivel plate 20 can rotate smoothly and without interference relative to the fixed plate 10. Even if a large impact is applied to the seat due to a collision accident, etc., the guide parts 13 and 23 constrain the fixed plate 10 and the swivel plate 20 in the radial direction, so that the seat will not be separated from the assembly position.

[0053] The brake unit 30 assembles the rotating plate 20 to the fixed plate 10 in a rotatable state, transmits the rotational force of the motor 40 to the rotating plate 20 to rotate the seat, and generates a braking force for the rotational force acting on the seat side to maintain the stopped state when the motor 40 is stopped, thereby fixing the seat in a state where it cannot rotate. The detailed structure of the brake unit 30 will be described below.

[0054] The motor 40 is fixedly mounted on the lower portion of the fixing plate 10 via the mounting plate 50. The mounting plate 50 is a metal plate disposed on the lower portion of the fixing plate 10 at a predetermined interval, and is preferably welded to the fixing plate 10.

[0055] The motor 40 is a gear motor integrally provided with a speed reduction gear box 41, and a mounting bracket 42 is provided on the upper portion of the gear box 41. An output gear 43 of the gear box 41 passes through the center portion of the mounting bracket 42 and protrudes upward.

[0056] A through hole 51 whose center coincides with the through holes 11 and 21 of the fixed plate 10 and the rotating plate 20 is formed at the center of the mounting plate 50 , and a gear hole 52 for inserting the output gear 43 is formed on the outer side of the through hole 51 .

[0057] The mounting bracket 42 is fixed to the bottom surface of the mounting plate 50 by bolts so that the output gear 43 is inserted into the gear hole 52. In the assembled state, the output gear 43 of the motor 40 is meshed with the driving gear of the brake unit 30.

[0058] Reference Figures 3 to 5 , the brake unit 30 which is a main structure of the present invention is described. Figure 3 is a three-dimensional diagram of the upper surface of the brake unit 30, Figure 4 is a three-dimensional view of the lower surface of the brake unit 30, Figure 5 It is an exploded perspective view of the brake unit 30 .

[0059] The brake unit 30 includes a brake plate 33 , a drive plate 34 , a side plate 36 , a wedge roller 33 d and the like between a drum casing 31 and a casing cover 32 , and a drive gear 35 is mounted on the drive plate 34 from the outside of the casing cover 32 .

[0060] The drum housing 31 and the housing cover 32 are welded and fixed to each other, and a space capable of accommodating the above components is formed therebetween. A plurality of bolt fastening portions 31a, 32a facing each other are formed at the same position on the outer peripheral surfaces of the drum housing 31 and the housing cover 32, and bolt holes are formed in these bolt fastening portions 31a, 32a. These bolt fastening portions 31a, 32a are fixed to the mounting portion 12 of the fixing plate 10 by bolts.

[0061] like Figure 5 , Figure 6 As shown, the brake plate 33 has wedge-shaped protrusions 33a formed on the outer circumferential surface at equal intervals along the circumferential direction. Wedge grooves 33b whose width gradually narrows toward the inside are formed on both side surfaces of the wedge-shaped protrusions 33a. The bottom surfaces of the wedge grooves 33b on both sides of the wedge-shaped protrusions 33a are wedge surfaces 33c, and the wedge surfaces 33c become lower as they approach the wedge-shaped protrusions 33a (the distance from the inner circumferential surface of the drum shell 31 increases), and become higher as they move away from the wedge-shaped protrusions 33a (the distance from the inner circumferential surface of the drum shell 31 decreases).

[0062] Wedge rollers 33d are provided on both sides of the wedge-shaped protrusion 33a, and the wedge rollers 33d are elastically supported by elastic members 33e inserted into the inner side of the wedge groove 33b. The elastic members 33e push the wedge rollers 33d toward the upper part of the wedge surface 33c, and the wedge rollers 33d are sandwiched between the inner peripheral surface of the drum housing 31 and the wedge surface 33c.

[0063] The brake plate 33 is provided with a driving plate 34 and a side plate 36 on both side surfaces thereof so that the wedge roller 33 d and the elastic member 33 e do not separate in the axial direction of the brake plate 33 .

[0064] A plurality of bolts 33f are provided in the circumferential direction on one side of the brake plate 33, and the portion provided with the bolts 33f protrudes toward one side of the brake unit 30 through the through hole of the drum housing 31. The bolts 33f are fastened to the mounting portion 22 of the swing plate 20. Since the swing plate 20 is fixed to the lower part of the seat, the brake plate 33 swings together with the seat.

[0065] The driving plate 34 has a plurality of operating pieces 34a formed on its outer peripheral surface so as to protrude toward the brake plate 33. The operating pieces 34a are formed in the same number as the wedge-shaped protrusions 33a of the brake plate 33 and are located between the wedge-shaped protrusions 33a.

[0066] On the other hand, the portion between the wedge surfaces 33c on both sides of the adjacent wedge-shaped protrusions 33a of the brake plate 33 is formed as a circumferential surface (circumferential surface 33g). In response to this, the operating piece 34a is also formed in an arc shape with the same curvature as the circumferential surface 33g, and is in contact with (or slightly separated from) the circumferential surface 33g. In this state, when the drive plate 34 rotates, the operating piece 34a slides along the circumferential surface 33g and rotates.

[0067] The end of the wedge-shaped protrusion 33a of the driving plate 34 contacts the inner circumferential surface of the drum shell 31. Therefore, as described above, the operating piece 34a of the driving plate 34 contacts the circumferential surface 33g of the brake plate 33, so that the rotation centers of the drum shell 31, the brake plate 33, and the driving plate 34 are consistent, which is conducive to correctly maintaining the coaxial relationship between the components.

[0068] On the other hand, a plurality of coupling pieces 34b are formed on the inner peripheral surface of the drive plate 34 protruding toward the outer shell cover 32. These coupling pieces 34b are inserted and mounted on the inner diameter surface of the drive gear 35 located outside the outer shell cover 32 and then welded. Therefore, the drive gear 35 rotates integrally with the drive plate 34.

[0069] Can Figure 3 and Figure 4 The assembled state of the brake unit 30 assembled in the above-mentioned structure is confirmed.

[0070] Regarding the brake unit 30, the bolt fastening parts 31a and 32a are assembled to the mounting part 12 of the fixing plate 10 by bolts. In the assembled state, the driving gear 35 of the brake unit 30 passes through the inner diameter part of the fixing plate 10 and protrudes downward from the fixing plate 10, and the output gear 43 of the motor 40 meshes with the driving gear 35.

[0071] Hereinafter, the effects of the present invention will be described.

[0072] The seat is fixed to the seat track of the vehicle floor by the power rotation device of the present invention. In the normal use state (the motor 40 is off), as Figure 6 As shown in (a) of FIG. 1 , the brake unit 30 is in a state where the wedge roller 33 d is pushed toward the high side of the wedge surface 33 c by the elastic member 33 e .

[0073] In the above state, when an external force acts on the seat in the rotational direction, the rotational force is transmitted to the brake plate 33 connected to the seat side, and the wedge roller 33d on the opposite side of the rotational direction is sandwiched between the wedge surface 33c of the brake plate 33 and the inner peripheral surface of the drum shell 31 with the wedge-shaped protrusion 33a as a reference, so that the brake plate 33 cannot rotate. The wedge rollers 33d are provided on both sides of the wedge-shaped protrusion 33a, so the brake plate 33 cannot rotate in both directions. As described above, the rotation of the brake plate 33 is restricted by the sandwiching of the wedge rollers 33d, so there is no rotational play between the drum shell 31 and the brake plate 33, and thus the rotational play of the brake plate 33 is not generated, and therefore the rotational play is not generated in the seat. Therefore, the rotational fixation safety of the seat is greatly improved.

[0074] On the other hand, the user operates the power rotation device operating button (switch), so that when power is supplied to the motor 40 and the motor 40 rotates to one side, the output gear 43 of the motor 40 rotates, the drive gear 35 meshing with the output gear 43 rotates, and the drive plate 34 rotates integrally with the drive gear 35.

[0075] like Figure 6 As shown in (b), when the driving plate 34 rotates, the operating piece 34a of the driving plate 34 moves in the rotation direction and pushes the wedge roller 33d in the rotation direction. As a result, the wedge roller 33d moves downwardly from the wedge surface 33c, and the restraint state of the brake plate 33 on the drum shell 31 is released.

[0076] The wedge roller 33d pushed downwardly on the wedge surface 33c comes into contact with the upper side surface of the wedge-shaped protrusion 33a and the middle portion of the wedge surface 33c.

[0077] Therefore, the rotational force of the driving plate 34 is transmitted to the brake plate 33 via the operating piece 34 a , the wedge roller 33 d , and the wedge-shaped protrusion 33 a , so that the brake plate 33 rotates.

[0078] When the wedge roller 33d on one side of the wedge-shaped protrusion 33a is pushed by the operating piece 34a, the wedge roller 33d on the opposite side of the wedge-shaped protrusion 33a moves to the lower part of the corresponding wedge surface 33c by the rotation of the brake plate 33. That is, the wedge roller 33d on the opposite side of the wedge-shaped protrusion 33a cannot restrain the rotation of the brake plate 33 with respect to the drum shell 31.

[0079] Therefore, when the driving plate 34 rotates due to the operation of the motor 40 , the brake plate 33 rotates in the rotation direction, whereby the seat connected to the brake plate 33 rotates and the direction of the seat can be adjusted.

[0080] As described above, the power rotating device of the present invention has a brake unit 30 disposed between the fixed plate 10 and the rotating plate 20 to firmly maintain the rotation direction fixed state without play, so that no rotation direction play occurs between the fixed plate 10 and the rotating plate 20.

[0081] Therefore, there is no play in the seat in the rotational direction, the seat is secured in a rotational direction more securely, and there is an effect that noise caused by play in the seat in the rotational direction is not generated during driving.

[0082] As described above, the seat is fixed securely and noise is not generated, thereby achieving an effect of improving the sensory quality of the seat.

[0083] As described above, the present invention has been described with reference to the embodiments shown in the accompanying drawings, but this is only for illustration, and it should be understood that those skilled in the art can derive various modifications and other equivalent embodiments from these. Therefore, the true technical protection scope of the present invention should be defined by the scope of the claims.

Claims

1. A power rotation device for a vehicle seat, comprising: A fixing plate fixed to the seat track of the vehicle interior floor; A revolving plate is rotatably arranged on the upper part of the fixed plate and is equipped with a seat; A motor, arranged on the side of the fixing plate; as well as a brake unit, disposed between the fixed plate and the rotating plate, for transmitting the rotational force of the motor to the rotating plate when the motor is working, and for suppressing the rotational direction movement of the rotating plate when the motor stops; and The brake unit comprises: The drum shell and the shell cover are combined with each other to form a component arrangement space inside; A brake plate is disposed between the drum shell and the shell cover, and has a plurality of wedge-shaped protrusions formed on the outer peripheral surface, and wedge surfaces in the shape of inclined surfaces with a low side of the wedge-shaped protrusion and a high side opposite thereto are formed on both side surfaces of the wedge-shaped protrusion; a wedge roller provided between the wedge surface and the inner peripheral surface of the drum shell, and clamped between the wedge surface and the inner peripheral surface of the drum shell to constrain the rotation of the brake plate when the brake plate rotates; as well as an elastic member, arranged inside a wedge groove formed on a side surface of the wedge-shaped protrusion, and pressing the wedge roller upwardly from the wedge surface; A driving plate is provided between the brake plate and the outer shell cover, a plurality of operating plates are formed on the outer peripheral surface of the driving plate and are arranged between the wedge-shaped protrusions of the brake plate, a plurality of coupling plates are formed on the inner peripheral surface of the driving plate and protrude outward through the inner diameter portion of the outer shell cover, and the plurality of coupling plates are inserted into the inner diameter portion of the driving gear located outside the outer shell cover and are welded.

2. The power rotation device for a vehicle seat according to claim 1, characterized in that: A circular guide portion is formed on the fixing plate protruding upward. A circular guide portion is formed on the rotating plate protruding downward. The guide portion of the fixed plate surrounds the outside of the guide portion of the revolving plate, thereby suppressing radial play between the fixed plate and the revolving plate.

3. The power rotation device for a vehicle seat according to claim 1, characterized in that: A plurality of bolts are provided on one side surface of the brake plate. The bolts are exposed to the outside through the inner diameter portion of the drum housing, and the plurality of bolts are fastened to the mounting portion of the revolving plate.

4. The power rotation device for a vehicle seat according to claim 1, characterized in that: A plurality of bolt fastening portions facing each other are formed protrudingly on outer peripheral surfaces of the drum casing and the casing cover, and the plurality of bolt fastening portions are fixed to the mounting portion of the fixing plate by bolts.

5. The power rotation device for a vehicle seat according to claim 1, characterized in that: A circumferential surface is formed between the wedge surfaces on both sides of the wedge-shaped protrusions adjacent to each other on the brake plate, and the operating piece of the drive plate is formed in an arc shape having the same curvature as the circumferential surface and contacts the circumferential surface.

6. The power rotation device for a vehicle seat according to claim 1, characterized in that: A mounting plate is spaced apart at the lower part of the fixing plate, a motor is mounted on the mounting plate, and an output gear of the motor is meshed with a driving gear of the brake unit.

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