Reclining device for vehicle seat

Abstract

The present invention provides a reclining device for a vehicle seat, the reclining device comprising: a gear plate in which an outer gear provided on an outer diameter portion engages with an inner gear provided on an inner diameter portion of a flange, and the inner diameter portion has an accommodation portion; and first and second cams assembled between a flange protrusion protruding from the center of the flange and a bearing inserted into the accommodation portion. Outer diameter portions of the first and second cams include a first outer diameter portion and a second outer diameter portion extending from the first outer diameter portion, the first outer diameter portion is in contact with an inner diameter portion of the bearing, and the second outer diameter portion is spaced apart from the inner diameter portion of the gear plate and thus not in contact therewith.

Description

Reclining device for vehicle seats

[0001] The present invention relates to a reclining device for a vehicle seat.

[0002] Typically, a vehicle seat may include a seatback, which supports the passenger's upper body, a seat cushion, which supports the lower body, including the buttocks and thighs, and a headrest, which supports the back of the head. The connection between the seatback and seat cushion may be equipped with a reclining device, which allows for forward and backward angle adjustment of the seatback relative to the seat cushion.

[0003] Reclining devices for vehicle seats can be divided into manual types that adjust the angle of the seatback by the passenger's lever operation, and power types that automatically operate with the power of a motor through the operation of a switch.

[0004] A reclining device for a vehicle seat may include a flange having an internal gear formed thereon and a flange projection provided at a center thereof, a gear plate having an external gear formed thereon to mesh with the internal gear and a plate projection provided at a center thereof, a central projection through which a recliner shaft is penetrated and an input device having a device projection provided at an outer side of the central projection, a bearing assembled between the device projection and the plate projection, a pair of first and second cams assembled between the flange projection and the bearing, and a spring having ends on both sides elastically supporting one end of the first and second cams facing each other.

[0005] When the recliner shaft rotates clockwise, the input device connected to the recliner shaft may rotate. As the input device rotates, the device protrusion provided on the input device may rotate.

[0006] As the device protrusion rotates, it can pressurize the first cam, thereby rotating the first cam. As the first cam rotates, it can pressurize one end of the spring. As a result, both ends of the spring are narrowed, and the elastic force of both ends of the spring acts on the second cam, thereby rotating the second cam.

[0007] However, although it is advantageous in terms of securing strength to configure the length of the first and second cams that surround the flange projection of the flange to be long, as the length of the first and second cams increases, the wear of the bearing may progress rapidly due to the increase in frictional resistance between the first and second cams and the bearing.

[0008] [Prior Art Literature]

[0009] [Patent Document]

[0010] (Patent Document 1) Republic of Korea Patent Publication No. 10-2020-0064262 (Published on June 8, 2020)

[0011] In order to solve the above-mentioned problem, the present invention seeks to provide a reclining device for a vehicle seat capable of minimizing friction between the first and second cams and the bearing.

[0012] In order to achieve the above-mentioned object, the present invention provides a reclining device for a vehicle seat, comprising: a gear plate having an outer gear provided on an outer diameter portion and an inner gear provided on an inner diameter portion of a flange, and a receiving portion provided on an inner diameter portion; and first and second cams assembled between a flange projection protruding from the center of the flange and a bearing inserted into the receiving portion; wherein the outer diameter portions of the first and second cams include a first outer diameter portion and a second outer diameter portion extending from the first outer diameter portion, and the first outer diameter portion contacts the inner diameter portion of the bearing, and the second outer diameter portion is not in contact with the inner diameter portion of the gear plate by a gap.

[0013] Additionally, the diameter of the inner diameter of the bearing may be smaller than the diameter of the inner diameter of the gear plate.

[0014] Additionally, one surface of the gear plate, the bearing, and the first and second cams facing the flange can be in close contact with one surface of the flange.

[0015] In addition, it may further include an input device coupled to the flange projection.

[0016] In addition, the input device is provided with a central protrusion inserted into the inside of the flange protrusion, a disc portion is provided on the outside of the central protrusion, first and second device protrusions are provided on both sides of the disc portion, and one end and the other end of an elastic member can be inserted into an insertion groove provided on one end of the first and second cams.

[0017] In addition, a protrusion may be provided on one side of the first and second cams facing the first and second device protrusions, and one side of the protrusion may be configured as an inclined surface.

[0018] Additionally, one side of the protrusion of the first cam can be pressed by one end of the first device protrusion, and one side of the protrusion of the second cam can be pressed by one end of the second device protrusion.

[0019] Additionally, one end of the first and second device protrusions may be configured as an inclined surface that matches one side of the protrusions of the first and second cams.

[0020] Additionally, one end of the first and second device protrusions may be positioned opposite one side of the protrusions of the first and second cams, passing through the horizontal center axis of the input device.

[0021] Additionally, the inclination angle of one end of the first and second device protrusions may be configured to be 90 to 120 degrees.

[0022] The present invention can minimize friction between the first and second cams and the bearing.

[0023] In addition, the present invention can prevent excessive deformation and compression of the bearing due to external force.

[0024] Additionally, wear on bearings can be minimized.

[0025] FIG. 1 is an exploded perspective view of a reclining device for a vehicle seat according to a preferred embodiment of the present invention.

[0026] FIG. 2 is a partially cut-away perspective view of a reclining device for a vehicle seat according to a preferred embodiment of the present invention.

[0027] Figure 3 is an enlarged view of part A of Figure 2.

[0028] Fig. 4 is a cross-sectional view of a reclining device for a vehicle seat according to a preferred embodiment of the present invention.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals as much as possible even if they are shown in different drawings. Furthermore, in describing the present invention, if a detailed description of a related known structure or function is judged to obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, although preferred embodiments of the present invention will be described below, it should be understood that the technical idea of ​​the present invention is not limited thereto and can be modified and implemented in various ways by those skilled in the art.

[0030] FIG. 1 is an exploded perspective view of a reclining device for a vehicle seat according to a preferred embodiment of the present invention, FIG. 2 is a partially cut-away perspective view of a reclining device for a vehicle seat according to a preferred embodiment of the present invention, FIG. 3 is an enlarged view of part A of FIG. 2, and FIG. 4 is a cross-sectional view of a reclining device for a vehicle seat according to a preferred embodiment of the present invention.

[0031] As illustrated in FIGS. 1 to 4, the present invention may include a gear plate (20) having an outer gear (21) provided on an outer diameter portion.

[0032] The gear plate (20) may be provided with a receiving portion (24) in the inner diameter portion (22). A bearing (50) may be received in the receiving portion (24). The receiving portion (24) may be formed in a portion of the inner diameter portion (22) of the gear plate (20) facing the flange (10).

[0033] Since the bearing (50) is inserted into the receiving portion (24) in this way, excessive deformation and compression of the bearing (50) due to external force can be prevented.

[0034] The gear plate (20) can be inserted and assembled into the inner gear (11) provided on the inner diameter of the flange (10). The outer gear (21) of the gear plate (20) can be meshed with the inner gear (11) of the flange (10).

[0035] The flange (10) may be provided with a flange projection (12). The flange projection (12) may be formed to protrude from the center of the flange (10) toward the gear plate (20).

[0036] The first and second cams (61, 62) can be assembled between the flange projection (12) and the bearing (50) so as to surround the flange projection (12) of the flange (10). The outer diameters of the first and second cams (61, 62) can include a first outer diameter portion (64) and a second outer diameter portion (65) extending from the first outer diameter portion (64).

[0037] Since the diameter (D2) of the inner diameter (51) of the bearing (50) is smaller than the diameter (D1) of the inner diameter (22) of the gear plate (20), a gap (G) can be formed between the inner diameter (22) of the gear plate (20) and the outer diameters of the first and second cams (61, 62) when assembling the first and second cams (61, 62) between the flange projection (12) and the bearing (50).

[0038] The first outer diameter (64) of the first and second cams (61, 62) can contact the inner diameter (51) of the bearing (50). Due to the gap (G) formed between the inner diameter (22) of the gear plate (20) and the outer diameters of the first and second cams (61, 62), the second outer diameter (65) of the first and second cams (61, 62) can not contact the inner diameter (22) of the gear plate (20).

[0039] In this way, the height of the bearing (50) is minimized to be smaller than the height of the first and second cams (61, 62) so as to match the receiving portion (24), and only a portion of the first outer diameter (64) of the first and second cams (61, 62) is made to contact the inner diameter (51) of the bearing (50), thereby minimizing friction between the bearing (50) and the first and second cams (61, 62).

[0040] The gear plate (20), the bearing (50), and the flange (10)-facing surface (23, 53, 63) of the first and second cams (61, 62) can be assembled to be in close contact with the flange (10) surface (13).

[0041] The input device (40) may be provided with a circular portion (42) on the outside of the central protrusion (41). First and second device protrusions (43, 44) may be formed to extend to both sides of the circular portion (42).

[0042] The elastic member (80) can be assembled so that one end (81) and the other end (82) are inserted into the insertion groove (661) provided in one end (66) of the first and second cams (61, 62) while being in close contact with one surface of the disc portion (42). For example, the elastic member (80) can be a spring.

[0043] A protrusion (68) may be provided on one surface of the first and second cams (61, 62). One side surface (681) of the protrusion (68) of the first and second cams (61, 62) may be configured as an inclined surface.

[0044] One side (681) of the protrusion (68) of the first cam (61) can be pressed by one end (431) of the first device protrusion (43). One side (681) of the protrusion (68) of the second cam (62) can be pressed by one end (441) of the second device protrusion (44).

[0045] One end (431, 441) of the first and second device protrusions (43, 44) may be configured as an inclined surface that conforms to one side (681) of the protrusion (68) of the first and second cams (61, 62).

[0046] One end (431, 441) of the first and second device protrusions (43, 44) may be positioned opposite to one side (681) of the protrusion (68) of the first and second cams (61, 62) passing through the horizontal center axis (C) of the first and second device protrusions (43, 44).

[0047] The inclination angle (A) of one end (431, 441) of the first and second device protrusions (43, 44) can be configured to be 90 to 120 degrees.

[0048] The following describes the operation of the present invention.

[0049] As shown in FIGS. 1 to 3, when a passenger operates a lever (not shown) or a switch (not shown), a recliner shaft (30) connected to a lever (not shown) or a driving motor (not shown) can rotate in one direction.

[0050] As the recliner shaft (30) rotates in one direction, the input device (40) having an inner diameter of a square shape, such as a square shape, into which the recliner shaft (30) having a square shape, such as a square shape, is inserted and coupled, can rotate in one direction. The first device protrusion (43) can rotate in one direction together with the input device (40) to rotate the first cam (61) in one direction.

[0051] Specifically, as the first device protrusion (43) rotates in one direction, one end (431) of the first device protrusion (43) can press one side (681) of the protrusion (68) provided in the first cam (61). This allows the first cam (61) to rotate in one direction.

[0052] As the first cam (61) rotates in one direction, one end (81) of the elastic member (80) coupled to the insertion groove (661) of the first cam (61) is pressed, and the elastic force of the other end (82) of the elastic member (80) acts on the second cam (62), so that the second cam (62) can rotate in one direction.

[0053] At this time, the gear plate (20) rotates by generating a rotation ratio equal to the difference in the number of teeth between the inner gear (11) and the outer gear (21) with respect to the flange (10) by the rotation of the second cam (62), and the seat back (not shown) can rotate by the rotation of the flange (10). As a result, the angle of the seat back (not shown) can be adjusted in the forward and backward directions.

[0054] For example, the flange (10) may be connected to a seatback bracket (not shown), and the seatback bracket (not shown) may be connected to a seatback frame (not shown). The gear plate (20) may be connected to a seat cushion bracket (not shown) via a lower bracket (not shown). The seat cushion bracket (not shown) may be coupled to the seat cushion frame (not shown). With this structure, the angle between the seatback frame (not shown) and the seat cushion frame (not shown) may be varied depending on the relative rotation between the flange (10) and the gear plate (20).

[0055] The above description is merely an illustrative description of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications, changes, and substitutions may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of ​​the present invention, but rather to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments and the accompanying drawings. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. A gear plate having an external gear provided on the outer diameter portion and meshing with an internal gear provided on the inner diameter portion of the flange, and having a receiving portion provided on the inner diameter portion; and First and second cams assembled between a flange projection protruding from the center of the flange and a bearing inserted into the receiving portion; Including, A reclining device for a vehicle seat, characterized in that the outer diameters of the first and second cams include a first outer diameter and a second outer diameter extending from the first outer diameter, the first outer diameter contacting the inner diameter of the bearing, and the second outer diameter not contacting the inner diameter of the gear plate with a gap therebetween.

2. In paragraph 1, A reclining device for a vehicle seat, characterized in that the diameter of the inner diameter of the bearing is smaller than the diameter of the inner diameter of the gear plate.

3. In paragraph 1, A reclining device for a vehicle seat, characterized in that one surface of the gear plate, the bearing, and the first and second cams facing the flange are in close contact with one surface of the flange.

4. In paragraph 1, An input device coupled to the above flange projection; A reclining device for a vehicle seat further comprising:

5. In paragraph 4, A reclining device for a vehicle seat, characterized in that the input device has a central protrusion inserted into the interior of the flange protrusion, a disc portion is provided on the outer side of the central protrusion, first and second device protrusions are provided on both sides of the disc portion, and one end and the other end of an elastic member are inserted into an insertion groove provided on one end of the first and second cams.

6. In paragraph 5, A reclining device for a vehicle seat, characterized in that a protrusion is provided on one surface of the first and second cams facing the first and second device projections, and one side of the protrusion is configured as an inclined surface.

7. In paragraph 5, A reclining device for a vehicle seat, characterized in that one side of the protrusion of the first cam is pressed by one end of the first device protrusion, and one side of the protrusion of the second cam is pressed by one end of the second device protrusion.

8. In paragraph 6, A reclining device for a vehicle seat, characterized in that one end of the first and second device protrusions is configured as an inclined surface that conforms to one side of the protrusions of the first and second cams.

9. In paragraph 6, A reclining device for a vehicle seat, characterized in that one end of the first and second device protrusions is positioned opposite one side of the protrusions of the first and second cams, passing through the horizontal center axis of the input device.

10. In paragraph 6, A reclining device for a vehicle seat, characterized in that the angle of inclination of one end of the first and second device protrusions is configured to be 90 to 120 degrees.

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