JP6219738B2 - Headrest device - Google Patents

Description

  The present invention relates to a headrest device.

  2. Description of the Related Art Conventionally, there is a vehicle headrest device that can tilt a headrest that is supported above a seat back. For example, in the headrest device described in Patent Literature 1, the headrest is supported so as to be rotatable with respect to a headrest stay provided on the seat back. This makes it possible to adjust the front-rear position of the headrest.

  Further, for example, in the headrest device described in Patent Document 2, the headrest can be largely moved forward integrally with the headrest stay by pulling up the headrest stay protruding from the seat back. As a result, the front view of the rear seat can be expanded by moving the headrest below the upper end of the seatback.

JP 2013-244157 A Japanese Examined Patent Publication No. 2-54255

  However, the conventional technique has a problem that the apparatus becomes complicated and large by providing both of the two position adjusting functions as described above. This problem becomes more prominent by automation using a motor as a drive source, and there is still room for improvement in this respect.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a headrest device that has an excellent position adjustment function and can be miniaturized with a simple configuration.

  A headrest device that solves the above problems is provided at a first bracket that is fixed to a seat back, a second bracket that is fixed to a headrest stay, and a coaxial position that is spaced apart in the seat width direction. A pair of pivot coupling portions that pivotably couple the two brackets, and rotation of the brackets at a position between the pivot coupling portions in the seat width direction by being held by either of the brackets. It is preferable to include a motor arranged along the axis and a drive mechanism that relatively rotates the brackets based on the driving force of the motor.

  According to the above configuration, when the headrest is in the normal state arranged above the seat back, the front and rear positions of the headrest can be adjusted steplessly by tilting the headrest stay. And thereby, a headrest can be arrange | positioned in the optimal position according to the physique, a seating attitude | position, etc.

  Further, by further tilting the headrest stay toward the front side of the vehicle, the headrest supported by the headrest stay can be moved downward from the upper end of the seat back with the same configuration as the position adjustment function. And thereby, the front view of a back seat can be expanded.

  Furthermore, the headrest stay fixed to the second bracket can be stably supported by providing the pair of rotation connecting portions at two positions separated in the seat width direction. In addition, the motor that serves as the drive source is arranged between the two rotation connecting parts so as to be along the rotation axis of both brackets, thereby holding the motor in a form that does not protrude in the thickness direction of the seat back and in the vertical direction. can do. As a result, it is possible to effectively reduce the size of the apparatus while suppressing the interference of the motor with the seat back.

  In the headrest device that solves the above-described problem, the drive mechanism includes a second output element coupled to the second output element with respect to the first bracket coupled to the first output element by rotationally driving the input element. It is preferable that a planetary gear mechanism capable of relatively rotating the two brackets is provided.

  According to the above configuration, a reduction gear having a small size and a high reduction ratio can be formed. In particular, the dimension along the rotation axis of both brackets, that is, the dimension in the sheet width direction can be suppressed. And thereby, size reduction of an apparatus can be achieved effectively.

  A headrest device that solves the above-described problem includes a pair of planetary gear mechanisms provided in each of the rotation coupling portions, and a coupling shaft that couples the input elements of the planetary gear mechanisms so as to transmit torque. Is preferred.

  According to the said structure, the driving force of a motor can be input into both planetary gear mechanisms via a connection shaft. And thereby, these both planetary gear mechanisms can be operated synchronously. As a result, the headrest stay can be tilted in a well-balanced manner with a small and simple configuration. Further, the load input to the headrest can be received in a distributed manner at both rotating connection portions. As a result, the headrest can be supported more stably above the seat back.

  A headrest device that solves the above-described problem is characterized in that the headrest stay has a pair of longitudinal axis portions that are arranged to extend in the vertical direction of the seat back by being fixed to the second bracket, and the seat width. It is preferable that the motor is disposed at a position between the two longitudinal axis portions in the sheet width direction while being disposed at a position between the both rotation connecting portions in the direction.

According to the said structure, size reduction of an apparatus can be achieved more effectively.
In the headrest device that solves the above-described problem, it is preferable that a tilting range of the headrest stay on the vehicle rear side is limited when the both brackets contact each other.

  According to the above configuration, even when an excessive load is input to the headrest, for example, at the time of a vehicle collision, the headrest can be held above the seat back. As a result, it is possible to more reliably support the occupant's head and ensure high safety.

  ADVANTAGE OF THE INVENTION According to this invention, size reduction of an apparatus can be achieved by simple structure, ensuring the outstanding position adjustment function.

The schematic block diagram which shows the headrest apparatus provided in the headrest stay and seat back which support a headrest. The perspective view of a headrest apparatus. The front view of a headrest apparatus. The side view of a headrest apparatus. Sectional drawing of a headrest apparatus (VV sectional drawing in FIG. 3). Sectional drawing of a headrest apparatus (VI-VI sectional drawing in FIG. 3). Sectional drawing of a headrest apparatus (VII-VII sectional drawing in FIG. 3). Sectional drawing of a headrest apparatus (VIII-VIII sectional drawing in FIG. 3).

Hereinafter, an embodiment of a headrest device for a vehicle will be described with reference to the drawings.
As shown in FIG. 1, a vehicle seat 1 is provided with a headrest 5 that supports a head 4 of an occupant 3 above a seatback 2. Specifically, the headrest 5 of this embodiment is supported by a headrest stay 6 provided so as to protrude from the seat back 2. The seat 1 is provided with a headrest device 10 that enables the position of the headrest 5 to be adjusted by tilting the headrest 5 integrally with the headrest stay 6.

  More specifically, as shown in FIGS. 2 to 4, the headrest device 10 according to the present embodiment includes a fixed bracket (first bracket) 11 that is fixed to the seat back 2 and a rotation that fixes the headrest stay 6. A bracket (second bracket) 12 and a rotation connecting portion 13 that rotatably connects these both brackets are provided.

  The fixed bracket 11 according to the present embodiment has a substantially plate-like outer shape extending in the vertical direction (the vertical direction in FIG. 3) of the seat back 2 and extends in the seat width direction (the horizontal direction in FIG. 3). A pair of vertical plate portions 11a and 11b that are spaced apart from each other, and a long plate-like horizontal plate portion 11c that is spanned between the vertical plate portions 11a and 11b are provided. The horizontal plate portion 11c is fixed to the lower end portions (the lower end portions in FIG. 3) of the vertical plate portions 11a and 11b by bolt fastening. In this embodiment, the fixing bracket 11 itself is also fastened to a seat back frame (not shown) by using the nut portions 11d provided on the vertical plate portions 11a and 11b. ing.

  On the other hand, the rotation bracket 12 has a long and substantially plate-like outer shape extending in the sheet width direction. The headrest stay 6 has a pair of longitudinal axis portions 6a and 6b having a long and substantially axial outer shape extending in the vertical direction of the seat back 2 and spaced apart in the seat width direction. And a horizontal axis portion 6c connecting the upper end portions of the vertical axis portions 6a and 6b. In addition, the headrest stay 6 of this embodiment is formed by bending a pipe material (pipe). As shown in FIG. 5, the headrest stay 6 of the present embodiment uses the fastening member 15 having a plurality of nut portions 15a, so that the lower end portions of both longitudinal axis portions 6a and 6b are rotated by fastening. The moving bracket 12 is fastened together.

  As shown in FIGS. 2 to 4, the headrest device 10 according to the present embodiment includes a pair of left and right rotation connecting portions 13 provided at coaxial positions spaced apart in the seat width direction. The pivot bracket 12 is connected to the fixed bracket 11 so that the both ends of the pivot bracket 12 can be pivoted through the pivot coupling portions 13.

  As shown in FIG. 2 to FIG. 4 and FIG. 6, the rotation connecting portion 13 of the present embodiment includes a first connecting member 21 connected to the fixed bracket 11 and a second connecting member connected to the rotating bracket 12. And 22 so as to be relatively rotatable.

  Specifically, the first connecting member 21 of the present embodiment is formed in a substantially flat plate shape. Further, both vertical plate portions 11a and 11b constituting the fixed bracket 11 are provided with flange portions 11e and 11f which are folded back toward the vehicle front side (left side in FIG. 4) at both ends in the longitudinal direction. It has been. And in this embodiment, the 1st connection member 21 is provided in the sheet | seat width direction both sides of the fixed bracket 11 in the form fastened by each of these flange parts 11e and 11f.

  On the other hand, the rotating bracket 12 includes a pair of folded portions 12b and 12c extending from both ends in the seat width direction of the base portion 12a to which the headrest stay 6 is fixed toward the vehicle front side (left side in FIG. 4). In the present embodiment, the folded portions 12b and 12c are in sliding contact with the pair of left and right first connecting members 21 connected to the fixing bracket 11 as described above from the inside in the sheet width direction. Is formed. Moreover, the 2nd connection member 22 of this embodiment has the substantially cup-shaped external shape which has the flange part 22a in the periphery. And the 2nd connection member 22 is the aspect which pinches | interposes the said 1st connection member 21 between each said folding | returning part 12b, 12c by making each said folding | returning part 12b, 12c into the fastening part 23 of the rotation bracket 12, respectively. The flange portion 22a is fastened.

  As shown in FIG. 6, the second connecting member 22 of the present embodiment has an annular fitting recess 24 on the sliding contact surface with the first connecting member 21 (the left side surface in the flange portion 22 a in FIG. 6). have. In the present embodiment, the fitting recess 24 is formed in the peripheral wall portion of the cup-shaped portion 22b having a bottomed cylindrical shape. Further, the first connecting member 21 has an annular projection on the sliding contact surface (the right side surface in FIG. 6) on the second connecting member 22 side, and has an annular outer shape to be fitted into the fitting recess 24. Part 25. And the rotation connection part 13 of this embodiment is fixed bracket 11 by which the 1st connection member 21 was fixed to the surroundings of the rotation axis L which passes along the center position of the fitting recessed part 24 and the annular protrusion 25 by this. And the rotating bracket 12 to which the second connecting member 22 is fixed are connected so as to be relatively rotatable.

  As shown in FIGS. 2 and 3, the headrest device 10 of the present embodiment includes a motor 30 held by the fixed bracket 11. Specifically, the motor 30 of the present embodiment is fixed to the horizontal plate portion 11c of the fixed bracket 11 in a state of being accommodated in a motor case 31 having a substantially cylindrical outer shape. The headrest device 10 of the present embodiment is provided with a drive mechanism 40 that relatively rotates the fixed bracket 11 and the rotation bracket 12 using the motor 30 as a drive source.

More specifically, in the present embodiment, the planetary gear mechanisms 41 are formed in the respective rotation connecting portions 13 that are spaced apart in the seat width direction as described above.
As shown in FIGS. 6 to 8, in the present embodiment, the annular protrusion 25 provided on the first connecting member 21 as described above has a cup whose inner peripheral surface 25 s constitutes the second connecting member 22. It is formed so as to be substantially flush with the inner peripheral surface 22s of the shape portion 22b. Further, inner teeth 42 and 43 having different numbers of teeth are formed on the inner peripheral surface 25s of the annular protrusion 25 and the inner peripheral surface 22s of the cup-shaped portion 22b, respectively.

  Further, in the present embodiment, the inner teeth 42 and 43 are arranged on the inner sides of the inner teeth 42 and 43 at positions eccentric from the rotation axes L of the first connecting member 21 and the second connecting member 22. A meshing external gear 44 is provided. Further, an eccentric cam 45 that is rotatably supported at a position coaxial with the rotation axis L of the first connecting member 21 and the second connecting member 22 is provided inside the external gear 44. Specifically, the eccentric cam 45 of the present embodiment includes through holes 46 and 47 provided in the first connecting member 21 and the second connecting member 22 (and through holes provided in the respective fastening portions 23 of the rotating bracket 22). A coaxial part 45a inserted into the hole 48) and an eccentric part 45b fitted into a through hole 49 provided in the external gear 44. In this embodiment, the planetary gear mechanism 41 is thus formed with the eccentric cam 45 as an input element and the first connecting member 21 and the second connecting member 22 as first and second output elements, respectively. It is like that.

  That is, in the planetary gear mechanism 41 of the present embodiment, the external gear 44 for the internal teeth 42 and 43 formed on the first connecting member 21 and the second connecting member 22 when the eccentric cam 45 is rotationally driven. The meshing position is configured to move. And thereby, the 1st connection member 21 and the 2nd connection member 22 rotate relatively based on the number-of-teeth difference set to each of the internal teeth 42 and 43.

  More specifically, in the present embodiment, the eccentric cam 45 constituting the planetary gear mechanism 41 as described above is located at a position coaxial with the rotation axis L of the first connecting member 21 and the second connecting member 22. A hexagonal hole 50 that penetrates the eccentric cam 45 in the axial direction is formed.

  As shown in FIGS. 2 to 4, in the headrest device 10 of the present embodiment, the planetary gears provided in the left and right rotational connection portions 13 by fitting the shaft end portions into the hexagonal holes 50. A connecting shaft 51 is provided for connecting the input elements of the mechanism 41 so that torque can be transmitted. In the drive mechanism 40 of the present embodiment, the connecting shaft 51 and the motor 30 are drivingly connected via spur gears 52 and 53.

  Specifically, the motor 30 of the present embodiment includes the fixing bracket 11 along the rotation axis L of the first connecting member 21 and the second connecting member 22 so as to be substantially parallel to the connecting shaft 51. Is held on. Specifically, the motor 30 is arranged at the position inside the seat width direction of the headrest stay 6 fixed to the rotating bracket 12, that is, between the longitudinal axis portions 6 a and 6 b extending in the vertical direction of the seat back 2. ing. Furthermore, a gear case 54 formed integrally with the motor case 31 is provided at the axial end of the motor case 31. In this embodiment, the spur gear 52 fixed to the connecting shaft 51 and the spur gear 53 fixed to the motor shaft 30a mesh with each other in the gear case 54.

  In other words, the driving force of the motor 30 is such that the planetary gear mechanism 41 provided on the left and right rotational connecting portions 13 via these spur gears 52 and 53 and the connecting shaft 51, specifically, the eccentricity constituting the input element thereof. It is transmitted to the cam 45. Further, when the eccentric cam 45 is driven to rotate, the rotating bracket 12 connected to the second connecting member 22 rotates with respect to the fixed bracket 11 connected to the first connecting member 21. And the headrest apparatus 10 of this embodiment can adjust the position of the headrest 5 supported by the said headrest stay 6 by tilting the headrest stay 6 fixed to the rotation bracket 12 by this. It has become.

  As shown in FIGS. 2, 4, and 5, the headrest device 10 according to the present embodiment rotates the rotation of the rotation bracket 12 in the direction in which the headrest stay 6 tilts toward the vehicle rear side. The base portion 12 a of the bracket 12 is configured to abut against both the vertical plate portions 11 a and 11 b of the fixed bracket 11. And in this embodiment, this limits the tilting range of the headrest stay 6 in the vehicle rear side.

Next, the operation of the headrest device 10 configured as described above will be described.
As shown in FIG. 1, the headrest 5 supported by the headrest stay 6 is disposed above the seatback 2 when the occupant 3 is in a normal state where it can be seated on the seat 1. And the headrest apparatus 10 of this embodiment can adjust the front-back position of the headrest 5 in a stepless manner by tilting the headrest stay 6 in this state.

  Further, the headrest device 10 of the present embodiment can tilt the headrest stay 6 further toward the vehicle front side beyond the adjustment range of the front-rear position as described above. As a result, the front view of the rear seat can be expanded by moving the headrest 5 supported by the headrest stay 6 below the upper end 2a of the seat back 2.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The headrest device 10 is separated from the fixed bracket 11 (first bracket) fixed to the seat back 2 and the rotating bracket 12 (second bracket) fixed to the headrest stay 6 in the seat width direction. And a pair of rotation connecting portions 13 that are provided at the same coaxial position and rotatably connect both brackets. The headrest device 10 is held by the fixed bracket 11, and the motor 30 disposed along the rotation axis L of both brackets at a position between the both rotation coupling portions 13 in the seat width direction, And a drive mechanism 40 for relatively rotating both brackets based on the drive force of the motor.

  According to the above configuration, when the headrest 5 is in a normal state arranged above the seat back 2, the front and rear positions of the headrest 5 can be adjusted steplessly by tilting the headrest stay 6. And thereby, the headrest 5 can be arrange | positioned in the optimal position according to the physique, a seating attitude | position, etc.

  Further, by further tilting the headrest stay 6 toward the front side of the vehicle, the headrest 5 supported by the headrest stay 6 is moved below the upper end 2a of the seat back 2 with the same configuration as the position adjustment function. Can be made. And thereby, the front view of a back seat can be expanded.

  Furthermore, the headrest stay 6 fixed to the rotating bracket 12 can be stably supported by providing the pair of rotating connecting portions 13 at two positions separated in the seat width direction. Further, the motor 30 serving as a driving source is arranged between the both rotation connecting portions 13 so as to follow the rotation axis L of both brackets, whereby the thickness direction of the seat back 2 (the left-right direction in FIGS. ) And the vertical direction (the vertical direction in FIGS. 1 and 4), the motor 30 can be held in a form that does not protrude. As a result, it is possible to effectively reduce the size of the apparatus while suppressing the interference of the motor 30 with the seat back 2.

  (2) The drive mechanism 40 has a second output element (to the fixed bracket 11 coupled to the first output element (first coupling member 21) by rotationally driving the input element (eccentric cam 45). A planetary gear mechanism 41 capable of relatively rotating the rotating bracket connected to the second connecting member 22) is provided.

  According to the above configuration, a reduction gear having a small size and a high reduction ratio can be formed. In particular, it is possible to suppress the dimension along the rotation axis L of both brackets, that is, the dimension in the seat width direction. And thereby, size reduction of an apparatus can be achieved effectively.

  (3) The drive mechanism 40 includes a pair of planetary gear mechanisms 41 provided in each of the rotation coupling portions 13 and a coupling shaft 51 that couples the eccentric cams 45 of the planetary gear mechanisms 41 so as to transmit torque. .

  According to the above configuration, the driving force of the motor 30 can be input to the planetary gear mechanism 41 via the connecting shaft 51. And thereby, these both planetary gear mechanisms 41 can be operated synchronously. As a result, the headrest stay 6 can be tilted in a well-balanced manner with a small and simple configuration. In addition, the load input to the headrest 5 can be received by being distributed to both the rotation connecting portions 13. As a result, the headrest 5 can be supported more stably above the seat back 2.

  (4) The headrest stay 6 includes a pair of longitudinal axis portions 6 a and 6 b that are arranged to be separated from each other in the seat width direction by being fixed to the fixing bracket 11. And the motor 30 is arrange | positioned in the position between these both vertical-axis parts 6a and 6b in a sheet | seat width direction. By adopting such a configuration, it is possible to more effectively reduce the size of the apparatus.

  (5) The headrest device 10 is configured such that the tilting range of the headrest stay 6 on the vehicle rear side is limited by the fixed bracket 11 and the rotating bracket 12 coming into contact with each other.

  According to the above configuration, for example, even when an excessive load is input to the headrest 5 such as when a vehicle collides, the headrest 5 can be held above the seat back 2. As a result, it is possible to more reliably support the head 4 of the occupant 3 and ensure high safety.

In addition, you may change the said embodiment as follows.
In the above embodiment, the motor 30 is held by the fixed bracket 11, but the motor 30 may be held by the rotating bracket 12.

  The configuration of the drive mechanism 40 may be arbitrarily changed. For example, the connection shaft 51 and the motor shaft 30a may be configured to be driven and connected via a gear other than the spur gears 52 and 53. Moreover, you may change arbitrarily also about the structure of the planetary gear mechanism 41 used as a reduction gear. Further, the planetary gear mechanism 41 may be provided only on one side of the both rotation coupling portions 13 or at a place other than the rotation coupling portion 13. In this case, the connecting shaft 51 may not be provided. And the structure which does not use the planetary gear mechanism 41 may be sufficient. For example, a configuration in which a speed reducer other than the planetary gear mechanism is interposed between a rotating shaft that integrally rotates with one of the brackets and the motor 30 fixed to the other bracket may be employed.

  In the above embodiment, the motor 30 is arranged so as to be substantially parallel to the connecting shaft 51, but it is not necessarily required to be completely parallel. Further, the shape of the headrest stay 6 may be arbitrarily changed. For example, the horizontal axis portion 6c may not be provided. Further, the number of the vertical axis portions may be one or three or more. Further, although the motor 30 is disposed at a position between the longitudinal axis portions 6a and 6b constituting the headrest stay 6 in the seat width direction, the present invention is not necessarily limited thereto. Further, the shapes of the fixed bracket 11 and the rotating bracket 12 may be arbitrarily changed.

  DESCRIPTION OF SYMBOLS 1 ... Seat, 2 ... Seat back, 2a ... Upper end, 3 ... Crew, 4 ... Head, 5 ... Headrest, 6 ... Headrest stay, 6a, 6b ... Vertical axis part, 10 ... Headrest device, 11 ... Fixed bracket 1), 12... Rotating bracket (second bracket), 12 b and 12 c, Folded portion (fastening portion), 13, Rotating connecting portion, 21... First connecting member (first output element), 22 ... second connecting member (second output element), 24 ... fitting recess, 25 ... annular protrusion, 30 ... motor, 30a ... motor shaft, 40 ... drive mechanism, 41 ... planetary gear mechanism, 42, 43 ... inside Teeth, 44 ... external gear, 45 ... eccentric cam (input element), 51 ... connecting shaft, 52, 53 ... spur gear, L ... rotating shaft.

Claims (4)

A first bracket fixed to the seat back;
A second bracket to which the headrest stay is fixed;
A pair of pivot connecting portions provided at coaxial positions spaced apart in the seat width direction and pivotably coupling the first and second brackets;
A motor disposed along the pivot axis of the brackets at a position between the pivot joints in the seat width direction by being held by either of the brackets;
A drive mechanism for relatively rotating the brackets based on the driving force of the motor;
Equipped with a,
The drive mechanism rotates the second bracket connected to the second output element relative to the first bracket connected to the first output element by rotating the input element. A headrest device provided with a planetary gear mechanism that can be used. The headrest device according to claim 1 ,
A pair of the planetary gear mechanisms provided in each of the rotation connecting portions, and a connecting shaft for connecting the input elements of the planetary gear mechanisms so as to transmit torque;
Headrest device characterized by. The headrest device according to claim 1 or 2 ,
The headrest stay has a pair of longitudinal axis portions which are arranged to extend in the vertical direction of the seat back by being fixed to the second bracket, and the headrest stays of the both rotation connecting portions in the seat width direction. And placed in between
The motor is disposed at a position between the vertical axis portions in the sheet width direction;
Headrest device characterized by. In the headrest device according to any one of claims 1 to 3 ,
A headrest device characterized in that a tilt range of the headrest stay on the rear side of the vehicle is limited by the two brackets abutting each other.