JP2018192834A - Vehicular seat - Google Patents

Abstract

To provide one example of a vehicular seat capable of suppressing vibration caused by vibration of a driving device and generation of operation sound.SOLUTION: A first connection section 24 is connected to a driving device 20 on an opposite side of an output section 22A of a first axis line L1 direction end of the driving device 20. A second connection section 25 and a third connection section 26 are connected to the driving device 20 at a portion closer to the output section 22A than the first connection section 24. Furthermore, the second connection section 25 is connected to the driving device 20 at a position shifted from the third connection section 26 in a rotation direction L3. Thus, the first connection section 24 is configured to be connected to the driving device 20 at a portion away from the output section 22A. Therefore, vibration in the rotation direction L3 can be suppressed also by the first connection section 24 in addition to the second connection section 25 and the third connection section 26. Consequently, vibration caused by an operation of the driving device 20, impact due to torque reaction generated during an initial motion and generation of operation sound can be suppressed.SELECTED DRAWING: Figure 4

Description

  The present application relates to a vehicle seat including an electric drive device.

  For example, in the vehicle seat described in Patent Document 1, the seat back is reclined by a driving device such as a motor unit.

Japanese Patent Laying-Open No. 2015-20711

  The driving device is usually fixed to a seat frame of a vehicle seat. For this reason, the drive device fixed to the seat frame generates large vibrations, impacts and operating sounds due to torque reaction at the time of initial movement, and the seated person may feel uncomfortable. The present application provides an example of a vehicle seat that can suppress the generation of vibrations and operating sounds resulting from the operation of the drive device.

  The vehicle seat includes a drive device (20) having an electric motor (21) that outputs a rotational force, and an output unit (22A) that outputs the rotational force in a direction substantially orthogonal to the direction of the output, and the drive device (20). Is a fixing bracket (23) for fixing to the seat frame (7), the first connecting part (24), the second connecting part (25) and the third connecting part ( 26) and a fixing bracket (23) having a fixing portion (27) fixed to the seat frame (7).

  The rotation center axis of the electric motor (21) is the first axis (L1), the rotation center axis of the output part (22A) is the second axis (L2), and the circumferential direction is centered on the second axis (L2). Is the rotational direction (L3), the first connecting portion (24) is connected to the drive device (20) on the opposite side of the output portion (22A) of the end portion in the first axis (L1) direction. .

  The second connecting portion (25) and the third connecting portion (26) are connected to the drive device (20) at a position closer to the output portion (22A) than the first connecting portion (24), and the second connecting portion. The part (25) is connected to the drive device (20) at a position shifted in the rotation direction (L3) with respect to the third connection part (26).

  Thereby, a 1st connection part (24) becomes a structure connected with the drive device (20) in the site | part away from the output part (22A). Therefore, vibration in the rotation direction (L3) can be suppressed also by the first connecting portion (24) in addition to the second connecting portion (25) and the third connecting portion (26). As a result, it is possible to suppress the vibration caused by the operation of the drive device (20), the impact caused by the torque reaction generated in the rotation direction (L3) at the initial movement, and the generation of the operation sound.

In addition, you may comprise as follows.
When a portion of the fixed bracket (23) extending in a direction substantially parallel to the first axis (L1) is a bracket body (23A), the bracket body (23A) is centered on the electric motor (21) side. It is desirable that the shape has a curved shape. Thereby, it becomes possible to improve the cross-sectional secondary moment of the bracket body (23A), that is, the bending rigidity.

  The first connecting portion (24) is provided in an extending portion (23B) extending in a direction parallel to the second axis (L2) direction from one end side in the extending direction of the bracket main body portion (23A). The part (23A) and the extension part (23B) are integrally formed, and the bracket body part (23A) and the extension part (23B) are connected via a smoothly continuous curved surface (23E, 23F). It is desirable that Thereby, it can suppress that big stress concentration generate | occur | produces in the connection location of a bracket main-body part (23A) and an extension part (23B).

The first connecting portion (24) is preferably substantially U-shaped with one end side in the second axis (L2) direction opened. Thereby, the vibration of a rotation direction (L3) can be suppressed reliably.
Incidentally, the reference numerals in the above parentheses are examples showing the correspondence with the specific configurations described in the embodiments described later, and the present invention is limited to the specific configurations indicated by the reference numerals in the parentheses. It is not something.

1 is an external view of a vehicle seat according to an embodiment of the present invention. It is an external view of the back frame 7 which concerns on embodiment of this invention. It is a front view of the drive device 20 which concerns on embodiment of this invention. It is a rear view of the drive device 20 which concerns on embodiment of this invention. It is explanatory drawing of the fixing structure of the drive device 20 which concerns on embodiment of this invention. It is a perspective view of the fixing bracket 23 which concerns on embodiment of this invention. A is a front view of the fixing bracket 23 according to the embodiment of the present invention. B and C are side views of the fixing bracket 23 according to the embodiment of the present invention. D is a top view of the fixing bracket 23 according to the embodiment of the present invention. A is AA sectional drawing of FIG. 7A. FIG. 7B is a sectional view taken along line BB in FIG. 7A.

  The “embodiment of the invention” described below shows an example of an embodiment belonging to the technical scope of the present invention. In other words, the invention specific items described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the arrow etc. which show the direction attached | subjected to each figure are described in order to make it easy to understand the relationship between each figure. The present invention is not limited to the directions given in the drawings.

  At least one member or part described with at least a reference numeral is provided, except where “one” or the like is omitted. That is, when there is no notice such as “one”, two or more members may be provided.

(First embodiment)
1. Outline of Vehicle Seat In this embodiment, the vehicle seat according to the present invention is applied to a vehicle seat. A vehicle seat 1 shown in FIG. 1 includes a seat cushion 3 and a seat back 5. The seat cushion 3 is a part that supports a seated person's buttocks. The seat back 5 is a part that supports the back of the seated person.

  The back frame 7 shown in FIG. 2 is an example of a seat frame, and forms a skeleton of the seat back 5. The back frame 7 is swingably connected to a cushion frame (not shown). The cushion frame is a member that constitutes the skeleton of the seat cushion 3.

  The back frame 7 includes a pair of side frames 7A and 7B, an upper panel 7C, a lower panel 7D, and the like. The side frames 7A and 7B are members that extend substantially in the vertical direction and are disposed on both sides in the seat width direction.

  The upper panel 7C extends in the seat width direction and connects the upper ends of the side frames 7A and 7B. The lower panel 7D extends in the seat width direction and connects the lower ends of the side frames 7A and 7B.

2. 2. Reclining device 2.1 Outline of the reclining device The vehicle seat 1 includes an electric reclining device. The reclining device swings the seat back 5, that is, the back frame 7 in the seat front-rear direction with respect to the cushion frame. The reclining device has at least a driving device 20.

  As illustrated in FIG. 3, the drive device 20 includes an electric motor 21 and a speed reduction mechanism 22. The electric motor 21 generates a rotational force for swinging the back frame 7. The speed reduction mechanism 22 decelerates the rotational output of the electric motor 21 and increases the driving force (torque).

  The speed reduction mechanism 22 has at least an output part 22A. The output unit 22A outputs the rotational force in a direction substantially orthogonal to the “output direction of the electric motor 21”. The “direction of output of the electric motor 21” according to the present embodiment matches the rotation center axis L <b> 1 of the electric motor 21.

  Hereinafter, the rotation center axis L1 is referred to as a first axis L1. The rotation center axis of the output unit 22A is referred to as a second axis L2. A circumferential direction around the second axis L2 is referred to as a rotation direction L3. Note that the second axis L2 according to the present embodiment coincides with the sheet width direction. Therefore, the “output direction of the electric motor 21” is a direction orthogonal to the sheet width direction.

2.2 Fixing Structure of Drive Device The drive device 20 is fixed to either one of the pair of side frames 7A and 7B via a fixing bracket 23. As shown in FIG. 2, the drive device 20 according to the present embodiment is fixed to a surface of the side frame 7 </ b> A that faces the side frame 7 </ b> B.

  As shown in FIG. 4, the fixing bracket 23 is provided with a first connecting part 24, a second connecting part 25, a third connecting part 26, and a fixing part 27. The first connecting part 24, the second connecting part 25, and the third connecting part 26 are parts connected to the driving device 20.

  The 1st connection part 24 is a site | part connected with the drive device 20 on the opposite side to 22 A of output parts among the edge parts in the 1st axis line L1 direction. In other words, the first connecting portion 24 is connected to the portion farthest from the output portion 22A in the direction of the first axis L1, that is, the upper end portion of the electric motor 21.

  The second connecting part 25 and the third connecting part 26 are parts connected to the driving device 20 at a part closer to the output part 22A than the first connecting part 24. The second connecting part 25 and the third connecting part 26 according to the present embodiment are connected to the lower end side of the electric motor 21 in the drive device 20.

  The second connecting portion 25 is connected to the driving device 20 at a portion shifted in the rotation direction L3 with respect to the third connecting portion 26. In other words, the 2nd connection part 25 and the 3rd connection part 26 are parts which can receive the counter torque generated when 22 A of output parts output a rotational force (torque).

  Each 1st connection part 24-3rd connection part 26 supports the drive device 20 via elastic members 24A-26A, such as vibration-proof rubber. Each of the elastic members 24A to 26A has an annular shape having a through hole (not shown).

  The first connecting portion 15A24 is fixed to the driving device 20 by a bearing portion 24B of the electric motor 21 inserted into the through hole. Each of the second connecting portion 25 to the third connecting portion 26 is fixed to the driving device 20 by members 25B to 26B such as bolts or pins inserted into the through holes.

  As shown in FIG. 5, the fixing portion 27 is a portion fixed to the side frame 7A. That is, the driving device 20 is fixed to the side frame 7A via the fixing portion 27. The fixing portion 27 is fixed to the side frame 7A by a plurality of bolts 27A and 27B.

2.3 Structure of Fixed Bracket As shown in FIG. 6, the fixed bracket 23 includes a first connecting portion 24 to a third connecting portion 26, a bracket main body portion 23 </ b> A, and the like. The bracket body 23A is a portion extending in a direction substantially parallel to the first axis L1 in the fixed bracket 23) (see FIG. 4).

  The female screw portions 23G and 23H are portions where female screws that are screw-coupled to the bolts 27A and 27B are provided. The female screw parts 23G and 23H are parts formed by a weld nut or a burring part by burring processing or the like.

  As shown in FIGS. 7A to 7D, the first connecting portion 24 is provided in the first extending portion 23B. The second connecting portion 25 is provided in the second extending portion 23C. The third connecting portion 26 is provided in the third extending portion 23D.

  The first extending portion 23B to the third extending portion 23D and the bracket main body portion 23A are metal integrally formed products. Specifically, the first extending portion 23B to the third extending portion 23D and the bracket main body portion 23A are integrally formed by subjecting a cold rolled steel sheet such as SPCC or SPHC to press forming.

  The first extending portion 23B is a portion extending in a direction parallel to the second axis L2 direction from one end side in the extending direction of the bracket main body portion 23A. The second extending portion 23C and the third extending portion 23D are portions that extend in a direction parallel to the second axis L2 direction from the other end side in the extending direction of the bracket body portion 23A.

  The first extending portion 23B is a plate surface that is substantially orthogonal to the first axis L1. The second extending portion 23C and the third extending portion 23D are plate surfaces that are substantially orthogonal to the rotation direction L3. The 1st connection part 24 and the 2nd connection part 25 are the substantially U shape which the one end side of the 2nd axis L2 direction opened.

  In the state where the fixing bracket 23 according to the present embodiment is fixed to the side frame 7A, the first connecting portion 24 and the second connecting portion 25 are substantially U-shaped with the side frame 7B side opened.

  The bracket body 23A and at least the first extension 23B are connected to each other via smoothly curved surfaces 23E and 23F. As shown in FIGS. 8A and 8B, the bracket body 23A has a curved shape having a center of curvature on the electric motor 21 side (lower side in FIG. 8).

3. Characteristics of the Vehicle Seat According to the Present Embodiment The first connecting portion 24 is connected to the driving device 20 on the side opposite to the output portion 22A in the end portion of the driving device 20 in the first axis L1 direction. The second connecting portion 25 and the third connecting portion 26 are connected to the driving device 20 at a portion closer to the output portion 22A than the first connecting portion 24. Further, the second connecting portion 25 is connected to the driving device 20 at a portion that is shifted in the rotational direction L3 with respect to the third connecting portion 26.

  Thereby, the 1st connection part 24 becomes the structure connected with the drive device 20 in the site | part away from 22 A of output parts. Therefore, the vibration in the rotation direction L3 can be suppressed by the first connecting portion 24 in addition to the second connecting portion 25 and the third connecting portion 26. As a result, it is possible to suppress the vibration caused by the operation of the drive device 20, the impact caused by the torque reaction generated in the rotation direction L3 at the initial movement, and the generation of the operation sound.

  The bracket body 23A has a curved shape having a center of curvature on the electric motor 21 side. Thereby, it is possible to improve the cross-sectional secondary moment of the bracket body 23A, that is, the bending rigidity.

  The bracket main body portion 23A and the first extension portion 23B are connected via smoothly continuous curved surfaces 23E and 23F. Thereby, it can suppress that big stress concentration generate | occur | produces in the connection location of 23 A of bracket main-body parts, and the 1st extension part 23B.

The 1st connection part 24 and the 2nd connection part 25 are the substantially U shape which the one end side of the 2nd axis L2 direction opened. Thereby, the vibration of the rotation direction L3 can be suppressed reliably.
(Other embodiments)
In the above-described embodiment, the first extending portion 23B to the third extending portion 23D and the bracket main body portion 23A are integrally formed products made of metal. However, the invention disclosed in this specification is not limited to this.

  The bracket body 23A according to the above-described embodiment has a curved shape having a center of curvature on the electric motor 21 side. However, the invention disclosed in this specification is not limited to this. That is, for example, it may be a simple band plate shape or a rectangular shape (a U-shape) with an opening on the electric motor 21 side.

  In the above-mentioned embodiment, the 1st connection part 24 and the 2nd connection part 25 were the substantially U shape which the 2nd axis-L2 direction one end side opened. However, the invention disclosed in this specification is not limited to this. That is, for example, similarly to the third connecting portion 26, the first connecting portion 24 and the second connecting portion 25 may be configured in a closed shape (for example, a circle).

  The drive device 20 according to the above-described embodiment is a drive device that supplies rotational force to the recliner. However, the invention disclosed in this specification is not limited to this. That is, for example, a drive device that supplies a rotational force for raising and lowering the cushion seat may be used.

  In the above-described embodiment, the vehicle seat according to the present invention is applied to a normal passenger car. However, the application of the present invention is not limited to this, and can be applied to other automobile seats or seats used for vehicles such as railway vehicles, ships and aircraft.

  Furthermore, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims. Therefore, you may combine at least 2 embodiment among several embodiment mentioned above.

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat 3 ... Seat cushion 5 ... Seat back 7 ... Back frame 7A, 7B ... Side frame 20 ... Drive device 21 ... Electric motor 22 ... Deceleration mechanism 22A ... Output part 23 ... Fixed bracket 23A ... Bracket main part 23B ... 1st extension part 23C ... 2nd extension part 23D ... 3rd extension part 24 ... 1st connection part 25 ... 2nd connection part 26 ... 3rd connection part

Claims (4)

In vehicle seats mounted on vehicles,
A drive device mounted on the seat frame, the drive device having an electric motor that outputs a rotational force, and an output unit that outputs the rotational force in a direction substantially orthogonal to the direction of the output;
A fixing bracket for fixing the driving device to the seat frame, the first connecting portion connected to the driving device, the second connecting portion and the third connecting portion, and the fixing portion fixed to the seat frame. A fixing bracket having
When the rotation center axis of the electric motor is the first axis, the rotation center axis of the output unit is the second axis, and the circumferential direction around the second axis is the rotation direction,
The first connecting portion is connected to the driving device on the side opposite to the output portion among the first axial ends.
The second connecting part and the third connecting part are connected to the driving device at a portion closer to the output part than the first connecting part,
Furthermore, the second connecting portion is a vehicle seat that is connected to the driving device at a portion that is shifted in the rotational direction with respect to the third connecting portion.   The bracket body portion is a curved shape having a center of curvature on the electric motor side when a portion extending in a direction substantially parallel to the first axis of the fixed bracket is a bracket body portion. Vehicle seat. The first connecting part is provided in an extending part extending in a direction parallel to the second axial direction from one end side in the extending direction of the bracket body part,
The vehicle seat according to claim 2, wherein the bracket main body portion and the extending portion are integrally formed products, and the bracket main body portion and the extending portion are connected via a smoothly continuous curved surface. .   The vehicle seat according to any one of claims 1 to 3, wherein the first connecting portion has a substantially U shape having an opening at one end in the second axial direction.