JP2020199976A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat which enables easy assembly of a headrest.SOLUTION: A vehicle seat includes a headrest supported by a seat back. The headrest includes: stays fixed to the seat back; a first housing fixed to the stays; a second housing which moves in an anteroposterior direction relative to the first housing; an electric driving part which moves the second housing in the anteroposterior direction relative to the first housing; and a shaft which is moved by the electric driving part. The electric driving part includes: a motor fixed to the first housing; a sector gear which is rotationally driven by the motor; and a bracket provided on a side surface opposite to a side surface provided with the sector gear. The shaft is inserted into an elongated hole included in the first housing, an elongated hole included in the second housing, a hole included in the sector gear, and a hole included in the bracket.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to vehicle seats and is applicable, for example, to vehicle seats provided with power headrests.

The vehicle seat is slidably supported on the vehicle floor in the front-rear direction via a slide mechanism, and is rotatably supported on the rear end via a recline and a seat cushion that forms a seating surface for the seated person. It is composed of a seat back that forms the backrest of the seated person and a headrest that is freely attached to the upper end of the seat back and prevents the seated person's head from falling backward. There is. Some vehicle seats have a power headrest that raises and lowers the headrest by an electric drive mechanism (for example, Japanese Patent Application Laid-Open No. 2007-244811 (Patent Document 1)).

JP-A-2007-244811

In Patent Document 1, an arm portion of a sector gear is connected to a movable member connected to a headrest, and the sector gear is rotated by an actuator to move the movable member. In order to connect the arm part to the movable member, the bush pin and the parts of the main body are assembled to form a bush, the bush is mounted in the elongated hole of the movable member, and the presser is made of a metal plate to be mounted in the mounting hole and the mounting groove. The process of covering with a plate is required, which is troublesome.
An object of the present disclosure is to provide a vehicle seat in which the headrest can be easily assembled.
Other challenges and novel features will become apparent from the description and accompanying drawings herein.

The following is a brief overview of the representative ones of the present disclosure.
That is, the vehicle seat includes a headrest supported by the seat back. The headrests are attached to the stay fixed to the seat back, the first housing fixed to the stay, the second housing moving in the front-rear direction with respect to the first housing, and the first housing. It is provided with an electric drive unit that moves the second housing in the front-rear direction and a shaft that is moved by the electric drive unit. The electric drive unit includes a motor fixed to the first housing, a sector gear rotationally driven by the motor, and a bracket provided on a side surface opposite to the side surface on which the sector gear is provided. The shaft is inserted into a long hole of the first housing, a long hole of the second housing, a hole of the sector gear, and a hole of the bracket.

According to the vehicle seat, the headrest can be easily assembled.

FIG. 1 is a perspective view showing a vehicle seat according to an embodiment. FIG. 2 is a front view showing an outline of an assembled state of the seat back and the headrest of the vehicle seat of FIG. FIG. 3 is a side view of the headrest of FIG. FIG. 4 is an exploded perspective view of the headrest position adjusting mechanism. FIG. 5 is a perspective view of the electric drive unit of FIG. FIG. 6 is a perspective view showing the first housing. FIG. 7 is a perspective view showing the first housing and the second housing. FIG. 8A is a perspective view of the first housing after assembly, and FIG. 8B is a perspective view of the first housing, the second housing, and the shaft. FIG. 9A is a perspective view showing a core material in a state where the second housing is moving forward. FIG. 9B is a diagram showing FIG. 9A excluding the second housing. FIG. 10A is a perspective view showing a core material in a state where the second housing is moved in the rear direction. FIG. 10 (b) is a diagram showing FIG. 10 (a) excluding the second housing.

Hereinafter, embodiments will be described with reference to the drawings. However, in the following description, the same components may be designated by the same reference numerals and repeated description may be omitted. In addition, in order to clarify the description, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited.

(Vehicle seat)
The vehicle seat according to the embodiment will be described with reference to FIG. FIG. 1 is a perspective view showing a vehicle seat according to an embodiment.

The vehicle seat 1 shown here is, for example, one of a plurality of seats installed inside an automobile, which is a type of vehicle. In the following description, the vertical direction is defined as the vertical direction (UP, DW) with reference to the case where the vehicle on which the vehicle seat 1 is mounted is placed on a horizontal plane. Further, the front-rear direction (FR, RR) is defined to coincide with the front-rear direction of the vehicle, and the left-right direction (width direction) is defined to coincide with the width direction of the vehicle. FR is the front side direction of the vehicle, and RR is the rear side direction of the vehicle. Further, the vehicle seat 1 will be referred to as a right side (RH) and a left side (LH) when viewed from the rear of the vehicle.

As shown in FIG. 1, a vehicle seat 1 forming a seating portion for an occupant is supported on the floor of the vehicle. The vehicle seat 1 is supported by a seat cushion 10 forming a seat surface, a seat back 20 rotatably supported by a rear end portion of the seat cushion 10, and an upper end portion of the seat back 20. It is configured to include a headrest 30. The seat back 20 forms the backrest of the occupant, and the headrest 30 forms the restraint of the occupant's head. A stay 31 in which the upper end portion enters the headrest 30 is fixed to the seat back 20, and the headrest 30 is supported by the seat back 20 via the stay 31 and has a position adjusting mechanism described later. There is.

FIG. 2 is a front view showing an outline of an assembled state of the seat back and the headrest of the vehicle seat of FIG.

As shown in FIG. 2, the seat back 20 is formed by covering the cushion material 25 supported by the seat back frame 21 with the cover 26. A pair of left and right tubular support brackets 23 are fixed to the upper frame portion 21a and the upper panel 21b of the seat back frame 21. These support brackets 23 form circular openings that are separated from each other by a predetermined distance in the left-right direction and whose axes extend in the elevating direction of the headrest 30 in parallel with each other.

A headrest support 24 having an insertion hole for a stay 31 is attached to the support bracket 23 in a state of being press-fitted and prevented from coming off. The headrest 30 is supported at the upper end of the seat back 20 by a stay 31 that is inserted into the headrest support 24 and is attached so as not to come off. The headrest 30 can be raised and lowered with respect to the seat back frame 21 (seat back 20).

(Headrest)
The headrest will be described with reference to FIG. FIG. 3 is a side view of the headrest of FIG.

The headrest 30 has a stay 31, a housing 40 which is a core material, a cover 33, and a cushion material 34.

The housing 40 is composed of a first housing 41 connected to the stay 31 and a second housing 42 that can move in the front-rear direction with respect to the first housing 41. The housing 40 is made of a hard resin such as PP (polypropylene) or ABS resin.

The cover 33 is formed in a bag shape by sewing the skin materials together. An opening is formed at the bottom of the cover 33. The housing 40 is covered with the cover 33 by inserting the housing 40 into the inside of the cover 33 through the opening at the bottom of the cover 33 to close the opening. Further, an injection hole (not shown) into which the injection nozzle is inserted is provided at the bottom of the cover 33 in a state where the opening at the bottom is closed. A cushion material 34 is formed between the housing 40 and the cover 33 by foam molding integrally with the skin. As the cushion material 34, for example, polyurethane foam is used.

(Position adjustment mechanism)
The position adjusting mechanism of the headrest 30 will be described with reference to FIGS. 4 and 5. FIG. 4 is an exploded perspective view of the headrest position adjusting mechanism. FIG. 5 is a perspective view of the electric drive unit of FIG.

As described above, the headrest 30 includes a position adjusting mechanism 50 whose front-rear position can be adjusted. The position adjusting mechanism 50 includes a first housing 41 which is a fixed portion and a second housing 42 which is a movable portion. The first housing 41 includes an electric drive unit 51 that drives the second housing 42.

The first housing 41 is composed of an upper surface panel 41a, a lower surface panel 41b, a left side panel 41c, a right side panel 41d, and a back panel 41e. Rail-shaped convex portions 41f and 41g extending in the front-rear direction are formed on the left and right side surface sides of the lower surface of the upper surface panel 41a. Rail-shaped convex portions 41h and 41i extending in the front-rear direction are formed on the left and right side surface sides of the upper surface of the lower surface panel 41b. A hole 41l through which the power line 60 of the electric drive unit 51 passes is formed near the center of the lower surface panel 41b. An elongated hole 41j long in the front-rear direction is formed on the upper side of the left side panel 41c. An elongated hole 41k long in the front-rear direction is formed on the upper side of the right side panel 41d.

The second housing 42 is composed of a front panel 42a, an upper left side panel 42b, a lower left side panel 42c, an upper right side panel 42d, and a lower right side panel 42e (see FIG. 8). A groove-shaped recess 42f extending in the front-rear direction is formed on the upper surface of the upper left side panel 42b, and a groove-shaped recess 42h extending in the front-rear direction is formed on the lower surface of the lower left side panel 42c. A groove-shaped recess 42g extending in the front-rear direction is formed on the upper surface of the upper right side panel 42d, and a groove-shaped recess 42i extending in the front-rear direction is formed on the lower surface of the lower right side panel 42e.

The recesses 42f, 42g, 42h, and 42i of the second housing 42 can be moved in the front-rear direction with respect to the first housing 41 by using the convex portions 41f, 41g, 41h, and 41i as guides. The convex portions 41f, 41g, 41h, 41i and the concave portions 42f, 42g, 42h, 42i are also referred to as guide portions.

As shown in FIG. 4, the stays 31 are a pair of substantially cylindrical axes whose center lines extend in the vertical direction, and are arranged parallel to each other in the horizontal direction. The upper end of the stay 31 is fixed to the lower surface panel 41b of the first housing 41.

As shown in FIG. 5, the electric drive unit 51 includes a motor 52, a fixed bracket 53, a sector gear 54, and a bracket 55. The fixing bracket 53 forms a back surface portion 53a extending along the width direction and a side surface portion 53b extending along the front-rear direction, and a lower left side surface portion 53c extending along the front-rear direction and a lower right side surface extending along the front-rear direction. Form the portion 53d. The output shaft 52a of the motor 52 as a drive source bolted to the back panel 41e of the first housing 41 protrudes from the rectangular opening of the side surface portion 53b, and the output shaft 52a has a tip portion thereof. A spur gear (pinion gear) 52b is formed therein.

Further, a sector gear 54 as a rotating member having a substantially fan shape is rotatably supported by a hinge pin 58 between the side surface portion 53b of the fixing bracket 53 and the lower left side surface portion 53c. An arc-shaped guide hole 54a centered on the hinge pin 58 is formed in the sector gear 54, and a bolt 57 is inserted through the guide hole 54a. Then, the tip of the bolt 57 inserted into the guide hole 54a further penetrates the side surface portion 53b of the fixing bracket 53 and is fastened to the motor 52. The bolt 57 guides the rotation of the sector gear 54 with respect to the side surface portion 53b of the fixing bracket 53 centered on the hinge pin 58. A bracket 55 is rotatably supported by a hinge pin 58 on the right side surface of the lower right side surface portion 53d of the fixed bracket 53.

Further, the sector gear 54 is formed with a gear portion 54b that meshes with the spur gear (pinion gear) 52b of the output shaft 52a on the outer peripheral portion thereof, and an arm portion 54c that continuously extends outward in the radial direction at the lower end thereof. It is formed. The shaft 44 is inserted into the hole 54d at the tip of the arm portion 54c. The shaft 44 is inserted into the hole 55d at the tip of the bracket 55. The hinge pin 58 and the hinge pin 59 are in the same position in the front-rear direction and the up-down direction, and the length from the hinge pin 58 to the hole 54d and the length from the hinge pin 58 to the hole 55d are the same.

The left side panel 41c and the right side panel 41d of the first housing 41 are formed with elongated holes 41j and 41k recessed in an arc shape centered on the hinge pins 57 and 58, and the elongated holes 41j, The 41k accommodates the tip of the shaft 44 inserted into the hole 54d of the arm portion 54c and the hole 55d of the bracket 55. The elongated holes 41j and 41k limit the rotation range of the sector gear 54 with respect to the side surface portion 53b of the fixing bracket 53 to a range until the shaft 44 is locked to the inner wall surfaces on both sides in the circumferential direction.

The second housing 42 forms concave portions 42f, 42g, 42h, 42i that fit with the convex portions 41f, 41g, 41h, 41i of the first housing 41 on both sides in the width direction, and the convex portions of the fixed housing 41. It moves back and forth with respect to the first housing 41 in a manner guided by 41f, 41g, 41h, 41i. An elongated hole 42j penetrating in the thickness direction (left-right direction) is formed in the rear portion of the upper left side panel 42b of the second housing 42. The elongated hole 42j is a hole that is elongated vertically along the trajectory of the shaft 44 inserted into the first housing 41. An elongated hole 42k (see FIG. 8) similar to the elongated hole 42j is also formed in the upper right side panel 42d. A shaft 44 is inserted through the elongated hole 42j to slidably support the shaft 44. Therefore, when the shaft 44 is integrally rotated with the rotation of the sector gear 54, the shaft 44 moves while sliding the elongated hole 42j in the front-rear direction, and the second housing 42 is integrally moved in the front-rear direction.

In such a structure, when the motor 52 is driven and the output shaft 52a rotates, the rotational motion of the spur gear 52b is transmitted to the sector gear 54 (gear portion 54b) that meshes with the motor 52, and the sector gear 54 presses the hinge pin 58. Rotate to the center. Then, an arc motion centered on the hinge pin 58 is generated in the arm portion 54c of the sector gear 54.

Along with the circular motion around the hinge pin 57 of the arm portion 54c, the shaft 44 inserted through the arm portion 54c moves back and forth while sliding the elongated hole 42j of the second housing 42 in the front-rear direction. That is, in the arc motion (rotational motion) of the arm portion 54c, the vertical component is absorbed by the sliding of the shaft 44 in the elongated hole 42j, and only the component in the front-rear direction is transmitted to the second housing 42. As a result, the second housing 42 is moved in the front-rear direction, and the front side of the headrest 30 is moved back and forth via the cushion material 34.

The method of assembling the position adjusting mechanism 50 will be described with reference to FIGS. 5 to 8. FIG. 6 is a perspective view showing the first housing. FIG. 7 is a perspective view showing the first housing and the second housing. FIG. 8A is a perspective view of the first housing after assembly, with the second housing removed. FIG. 8B is a perspective view of the first housing, the second housing, and the shaft.

First, as shown in FIGS. 5 and 6, the motor 52, the sector gear 54, and the bracket 55 are fixed to the fixing bracket 53 with bolts 56, 57 and hinge pins 58, 59 to form the electric drive unit 51.

Next, as shown in FIG. 6, the electric drive unit 51 is fastened to the back panel 41e of the first housing 41 with bolts or the like via the fixing bracket 53.

Next, as shown in FIG. 7, the concave portions 42f, 42g, 42h, 42i of the second housing 42 are fitted in accordance with the convex portions 41f, 41g, 41h, 41i of the first housing 41. The backlash can be suppressed by the convex portion of the first housing 41 and the concave portion of the second housing 42.

Next, as shown in FIG. 8, the elongated hole 41j of the left side panel 41c of the first housing 41, the elongated hole 42j of the upper left side panel 42b of the second housing 42, the hole 54d of the sector gear 54, and the bracket. The shaft 44 is inserted so as to pass through the hole 55d, the elongated hole 42k of the upper right side panel 42d of the second housing 42, and the elongated hole 41k of the right side panel 41d of the first housing 41. After that, the E-ring 45 is fitted into the groove of the shaft 44 and fixed. The fixing of the shaft 44 is not limited to the E-ring, and may be fastened to the male screw portion of the shaft 44 with a nut, or the end portion of the shaft 44 may be crimped.

The operation of the position adjusting mechanism will be described with reference to FIGS. 9 and 10. FIG. 9A is a perspective view showing a housing in a state where the second housing is moving in the forward direction, except for the left side panel of the second housing. FIG. 9B is a diagram showing FIG. 9A excluding the second housing. FIG. 10A is a perspective view showing a housing in a state where the second housing is moving in the rear direction, and is shown except for the left side panel of the second housing. FIG. 10 (b) is a diagram showing FIG. 10 (a) excluding the second housing.

Normally, power is not supplied to the power supply line 60 by an operation unit (not shown) that switches the electrical connection between the power supply line 60 and the power supply, and the motor 52 is stopped. The gear portion 54b of the sector gear 54 and the motor The shaft 44 is held by the 52 being constantly meshed with the spur gear 52b.

At the time of operation, the operation unit supplies power to the power supply line 60 to operate the motor 52, so that the shaft 44 operates back and forth along the elongated holes 41j and 41k of the first housing 41. At that time, the inside of the first housing 41 (convex portions 41f, 41g, 41h, 41i) acts as a guide, and the second housing 42 moves substantially in parallel. The operation unit can change the direction of the current supplied to the power supply line 60, whereby the rotation direction of the motor 52 can be changed, and the operating direction of the shaft 44 can be changed.

In the forward operation of the shaft 44, even if it is not stopped by the operating portion, as shown in FIG. 9, the front end portion of the shaft 44 is brought into contact with the front end portions of the elongated holes 41j and 41k of the first housing 41 in the forward direction. It is possible to stop the movement of. Further, it is possible to stop the forward movement of the shaft 44 due to the operating limit of the gear portion 54b of the sector gear 54. The operating limit of the gear portion 54b of the sector gear 54 is determined by the guide hole 54a and the bolt 57.

In the rearward operation of the shaft 44, as shown in FIG. 10, the rear end portion of the shaft 44 is brought into contact with the rear end portions of the elongated holes 41j and 41k of the first housing 41 to stop the rearward movement. It is possible. Further, it is possible to stop the backward movement of the shaft 44 due to the operating limit of the gear portion 54b of the sector gear 54. Further, the rear end of the second housing 42 can be brought into contact with the front surface of the back panel 41e of the first housing 41 to stop the movement in the rear direction.

In the embodiment, the housing of the headrest is divided into a first housing and a second housing, and the long hole of the first housing, the long hole of the second housing, and the hole of the electrically movable part are aligned and the shaft is inserted. Since it is fixed with an E-ring or the like, it can be easily assembled.

Although the invention made by the present inventor has been specifically described above based on the embodiment, it goes without saying that the present invention is not limited to the above embodiment and can be variously modified.

1 ... Vehicle seat 10 ... Seat cushion 20 ... Seat back 30 ... Headrest 31 ... Stay 41 ... First housing 42 ... Second housing 44 ... Shaft 50 ... Position adjustment mechanism 51 ... Electric drive unit 52 ... Motor 54 ... Sector gear 55 ... Bracket

Claims (8)

With the seat back
The headrest supported by the seat back and
With
The headrest
The stay fixed to the seat back and
The first housing fixed to the stay and
A second housing that moves in the front-rear direction with respect to the first housing,
An electric drive unit provided in the first housing and moving the second housing in the front-rear direction with respect to the first housing.
A shaft moved by the electric drive unit and
With
The electric drive unit
The motor fixed to the first housing and
A sector gear provided on the side surface of the motor and rotationally driven by the motor,
Brackets provided on the side opposite to the side on which the sector gear is provided,
With
The shaft is a vehicle seat inserted through a long hole of the first housing, a long hole of the second housing, a hole of the sector gear, and a hole of the bracket. In the vehicle seat of claim 1,
The first housing has a top panel, a bottom panel, a left side panel, a right side panel, and a back panel.
The elongated hole of the first housing is a vehicle seat provided on the left side panel and the right side panel so as to extend in the front-rear direction. In the vehicle seat of claim 2,
The elongated hole of the first housing is a vehicle seat extending along an arc centered on the rotation center of the sector gear. In the vehicle seat of claim 3,
The second housing has a front panel, an upper left side panel, an upper right side panel, a lower left side panel, and a lower right side panel.
The elongated hole of the second housing is a vehicle seat provided on the upper left side panel and the upper right side panel. In the vehicle seat of claim 4,
A left guide portion and a right guide portion extending in the front-rear direction are provided on the lower surface of the upper surface panel of the first housing.
A left guide portion and a right guide portion extending in the front-rear direction are provided on the upper surface of the lower surface panel of the first housing.
A guide portion extending in the front-rear direction is provided on the upper surface of the upper left side panel of the second housing.
A guide portion extending in the front-rear direction is provided on the upper surface of the upper right side panel of the second housing.
A guide portion extending in the front-rear direction is provided on the lower surface of the lower left side panel of the second housing.
A guide portion extending in the front-rear direction is provided on the lower surface of the lower right side panel of the second housing.
The left guide portion of the top panel is fitted with the guide portion of the upper left side panel.
The right side guide portion of the top panel is fitted with the guide portion of the upper right side panel.
The left guide portion of the lower surface panel is fitted with the guide portion of the lower left side panel.
The right guide portion of the lower surface panel is a vehicle seat that fits with the guide portion of the lower right side panel. In the vehicle seat of claim 2,
The electric drive unit further includes a fixing bracket for fixing the motor to the back panel of the first housing.
The fixing bracket is a vehicle seat that is fixed to the motor and rotatably supports the sector gear and the bracket. In the vehicle seat of claim 6,
The sector gear is a vehicle seat having a gear portion that meshes with a spur gear provided on the output shaft of the motor and an arm portion. In the vehicle seat of claim 7,
The arm portion is a vehicle seat having the hole through which the shaft is communicated.

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