JP6717167B2 - Back frame for vehicle seats - Google Patents

Description

The present application relates to a back frame that is applied to a vehicle seat having a seat back that supports the back of a seated person and that constitutes the skeleton of the seat back.

The vehicle seat back frame is configured to include a pair of side frames as described in Patent Document 1, for example. Each side frame is a strength member that is arranged on each side of the seat width direction and extends substantially vertically.

JP, 2016-49801, A

The present application provides a new vehicle seat back frame in consideration of a case where a large load acts on the back frame from the seat width direction, for example.

In the present application, the pipe-shaped transmission rod (17) extends from the first side frame (9) side to the second side frame (11) side, and the load acting on the first side frame (9) is applied to the second side frame (9). A transmission rod (17) for transmitting to the (11) side, and a pressure receiving spacer fixed directly or indirectly to the second side frame (11) at a position facing the extension direction tip of the transmission rod (17). (25) between the pressure receiving spacer (25) made of resin that receives a load transmitted through the transmission rod (17), and the tip of the pressure receiving spacer (25) in the extending direction of the transmission rod (17). And a metal plate (27) fixed to the pressure receiving spacer (25) by a mechanical fastener (27A).

Accordingly, the load acting on the first side frame (9) is transmitted to the second side frame (11) side via the transmission rod (17), the plate (27) and the pressure receiving spacer (25). Therefore, even if a large load acts on the back frame from the seat width direction, it is possible to obtain a vehicle seat back frame that can withstand the load.

Since the metal plate (27) is fixed to the pressure receiving spacer (25), the load does not directly act on the resin pressure receiving spacer (25), and the pressure receiving spacer (25) is made of metal. Since it is in a reinforced state, it is possible to improve the mechanical strength of the pressure receiving spacer (25) including the plate (27).

The mechanical fastener (27A) is located in the inner peripheral edge (17B) of the transmission rod (17) projected on the plate (27). This can prevent the transmission rod (17) from interfering with the mechanical fastener (27A) when the transmission rod (17) is in contact with the plate (27).

Therefore, the entire distal end of the transmission rod (17) in the extending direction can be surely brought into contact with the plate (27), so that the load acting on the first side frame (9) is reliably transmitted to the second side frame (11). It becomes possible to do.

The present application may be configured as follows.
That is, it is desirable that the center position of the cross section of the mechanical fastener (27A) substantially coincides with the centroid of the figure drawn by the inner peripheral edge (17B). Thereby, for example, even when the transmission rod (17) is tilted, the entire tip of the transmission rod (17) in the extending direction can be surely brought into contact with the plate (27). The "centroid" means a position where the sum of area moments becomes zero.

The pressure receiving spacer (25) is provided with a protrusion (25A) protruding toward the plate (27) side, and the plate (27) is provided with a hole (27B) into which the protrusion (25A) is fitted. Furthermore, it is desirable that the protrusion (25A) and the hole (27B) be located outside the outer peripheral edge (17C) of the transmission rod (17) projected on the plate (27).

As a result, the assembly worker positions the plate (27) by the projection (25A) and the hole (27B), and then the plate (27) is attached to the pressure receiving spacer (25) by the mechanical fastener (27A). Can be fixed.

Since the plate (27) is provided with a hole (27B) into which the protrusion (25A) is fitted, for example, even when the transmission rod (17) is greatly inclined, the transmission rod (17) is The tip in the extending direction does not interfere with the protrusion (25A). Therefore, the entire tip of the transmission rod (17) in the extending direction can be surely brought into contact with the plate (27).

The cross-sectional shape of the protrusion (25A) and the hole (27B) is preferably polygonal or oval. As a result, the rotational displacement of the plate (27) is restricted by the protrusion (25A) and the hole (27B). Therefore, the assembling operator can fix the plate (27) to the pressure receiving spacer (25) while surely positioning the plate (27).

Incidentally, the reference numerals in the above parentheses are examples showing the correspondence with the specific configurations and the like described in the embodiments described later, and the present invention is limited to the specific configurations and the like indicated by the reference numerals in the parentheses. 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 an external view of the back frame 7 which concerns on embodiment of this invention. It is a disassembled perspective view of the back frame 7 which concerns on embodiment of this invention. It is an exploded perspective view of drive device 20 concerning an embodiment of the present invention. It is a figure which shows the assembly state of the drive device 20, the transmission rod 17, etc. which concern on embodiment of this invention. It is a figure which shows the assembly state of the drive device 20, the transmission rod 17, etc. which concern on embodiment of this invention. FIG. 8 is a sectional view taken along line AA of FIG. 7. It is a figure which shows the load receiving part 25B of the 1st pressure receiving spacer 25 which concerns on embodiment of this invention. It is a figure which shows the load receiving part 25B of the 1st pressure receiving spacer 25 which concerns on embodiment of this invention.

The “embodiment of the invention” described below is an example of an embodiment within the technical scope of the present invention. That is, the matters specifying the invention 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. It should be noted that the arrows and the like indicating the directions attached to the respective drawings are provided to facilitate understanding of the mutual relationships between the respective drawings. The present invention is not limited to the directions shown in the drawings.

At least one member or portion described with reference numerals is provided, unless otherwise specified as "one" or the like. That is, two or more members may be provided.
(First embodiment)
In the present embodiment, a vehicle seat back frame and a drive device according to the present application are applied to a front seat of a passenger car. In addition, the direction in the following description means the direction in a state where the vehicle seat according to the present embodiment is assembled to a vehicle.

1. Overview of Vehicle Seat As shown in FIG. 1, the vehicle seat 1 has at least a seat cushion 3 and a seat back 5. The seat cushion 3 is a part for supporting the buttocks of the seated person. The seat back 5 is a part for supporting the back of a seated person. The seat back 5 is capable of swinging (reclining) in the seat front-rear direction with respect to the seat cushion 3.

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

The back frame 7 has at least a pair of side frames 9 and 11, an upper panel 13, a lower panel 15, and the like. Each of the side frames 9 and 11 is a frame that extends substantially vertically and is arranged on both sides in the seat width direction.

The seat width direction according to the present embodiment coincides with the lateral direction of the vehicle. Hereinafter, the side frame 9 arranged on one end side in the seat width direction is also referred to as a first side frame 9. The side frame 11 arranged on the other end side in the seat width direction is also referred to as a second side frame 11.

The upper panel 13 extends in the seat width direction and connects the upper ends of the side frames 9 and 11 to each other. The upper panel 13 is a panel-shaped frame having an open cross-sectional shape in which the cross-sectional shape orthogonal to the extending direction is substantially C-shaped. The upper panel 13 according to this embodiment is a panel member having an open cross-sectional shape that is open at the seat rear side.

A pair of headrest supports 13A and 13B is fixed to the upper panel 13. The pair of headrest supports 13A and 13B are tubular (square tubular in the present embodiment) members for supporting the headrest 4 (see FIG. 1). The headrest 4 is a member for supporting the head of a seated person.

The lower panel 15 extends in the seat width direction and connects the lower end sides of the side frames 9 and 11 to each other. The lower panel 15 is a panel-shaped member having an open cross-sectional shape in which the cross-sectional shape orthogonal to the extending direction is substantially C-shaped or J-shaped.

In addition, the lower panel 15 according to the present embodiment has an open cross-sectional shape that is formed in a J shape with an opening at the front upper side of the seat. The pair of side frames 9 and 11, the upper panel 13, and the lower panel 15 are made of metal. These 9 to 15 are connected and fixed to each other by a joining means such as welding or a mechanical fastener such as a screw.

A transmission rod 17 extending from the first side frame 9 side to the second side frame 11 side is arranged between the pair of side frames 9 and 11. The transmission rod 17 is a columnar member for transmitting a load acting on the first side frame 9 (hereinafter referred to as a side impact load) to the second side frame 11 side. The transmission rod 17 according to this embodiment is a pipe-shaped tubular body having a hollow inside.

That is, as shown in FIG. 4, the frame bracket 19A is fixed to one end side in the extending direction of the transmission rod 17. A portion of the frame bracket 19A that extends in the vertical direction is fixed to the first side frame 9.

Panel brackets 19B and 19C are fixed to a portion of the transmission rod 17 facing the lower panel 15. The panel brackets 19B and 19C are fixed to the lower panel 15. That is, the transmission rod 17 is fixed to the back frame 7 via the frame bracket 19A and the pair of panel brackets 19B and 19C.

In the present embodiment, the frame bracket 19A and the pair of panel brackets 19B and 19C are fixed to the first side frame 9 and the lower panel 15 by mechanical fasteners (not shown) such as screws.

Each bracket 19A to 19C is fixed to the transmission rod 17 by welding. Incidentally, in the present embodiment, the first side frame 9 is located on the vehicle width direction end side, that is, on the door (not shown) side for getting on and off, and the second side frame 11 is the vehicle width direction center side. Located in.

2. Drive Device for Reclining 2.1 Outline of Drive Device As shown in FIG. 2, the drive device 20 is mounted on the back frame 7 and generates a swinging force. The swinging force is a force for swinging the back frame 7 with respect to the cushion frame. As shown in FIG. 5, the drive device 20 includes at least an electric motor 21, a reduction mechanism 23, a first pressure receiving spacer 25, a plate 27, a second pressure receiving spacer 29, and the like.

The electric motor 21 generates a driving force that is the source of the swinging force. The deceleration mechanism 23 decelerates the rotation output of the electric motor 21) to increase the driving force (torque). The speed reduction mechanism 23 according to the present embodiment turns the rotation output generated by the electric motor 21 by approximately 90 degrees and outputs the rotation output.

A polygonal through hole 23A is provided in the output portion of the reduction mechanism 23. A connecting rod 23B having a sectional shape similar to that of the through hole 23A is passed through the through hole 23A (see FIG. 6). The connecting rod 23B transmits the rotation output generated by the electric motor 21 to the pair of side frames 9 and 11 sides.

As shown in FIG. 7, the first pressure receiving spacer 25 is a resin member fixed to the speed reduction mechanism 23 at a position facing the tip 17A in the extending direction of the transmission rod 17. The first pressure receiving spacer 25 is a pressure receiving member that receives a load transmitted via the transmission rod 17.

The first pressure receiving spacer 25 is fixed to the speed reducing mechanism 23 so as to sandwich the speed reducing mechanism 23 in cooperation with the second pressure receiving spacer 29. That is, the first pressure receiving spacer 25 is arranged on the transmission rod 17 (first side frame 9) side with respect to the reduction mechanism 23.

The second pressure receiving spacer 29 is made of the same resin as the first pressure receiving spacer 25, and is arranged on the side opposite to the transmission rod 17 (on the side of the second side frame 11) with respect to the reduction mechanism 23. Then, the first pressure receiving spacer 25 and the second pressure receiving spacer 29 side are fastened and fixed to each other by screws 29A and 29B (see FIG. 5).

The second pressure receiving spacer 29 faces the second side frame 11 while being in contact with or close to the second side frame 11. The drive device 20 is fixed to the second side frame 11 via a bracket 23B (see FIG. 5) provided on the housing of the speed reduction mechanism 23. That is, the first pressure receiving spacer 25 is indirectly fixed to the second side frame 11 via the bracket 23B or the like.

The plate 27 is a metal plate member disposed on the transmission rod 17 side of the first pressure receiving spacer 25, and directly faces the extension direction tip 17A of the transmission rod 17. In other words, the plate 27 is arranged between the first pressure receiving spacer 25 and the transmission rod 17.

In the present embodiment, as shown in FIG. 7, the extension direction tip 17A of the transmission rod 17 is separated from the plate 27. Therefore, when the transmission rod 17 is displaced toward the plate 27 side by the side impact load and the tip 17A comes into contact with the plate 27, the side impact load passes through the first pressure receiving spacer 25 and the second pressure receiving spacer 29 to the second pressure receiving spacer 25. It is transmitted to the side frame 11.

In the present embodiment, the first pressure receiving spacer 25 and the second pressure receiving spacer 29 are fastened, and the first pressure receiving spacer 25 and the second pressure receiving spacer 29 sandwich the reduction mechanism 23, but the reduction mechanism is concerned. Not fixed at 23. Therefore, most of the side impact load transmitted to the first pressure receiving spacer 25 is transmitted to the second side frame 11 via the second pressure receiving spacer 29 instead of the reduction mechanism 23.

2.2 Plate Fixing Structure As shown in FIG. 8, the plate 27 is fixed to the first pressure receiving spacer 25 by a P screw (pan head screw) 27A. The P screw 27A is an example of a mechanical fastener. The P screw 27A is located in the inner peripheral edge 17B of the transmission rod 17 projected on the plate 27.

Specifically, the cross-sectional center position O1 of the P screw 27A substantially coincides with the centroid of the figure drawn by the inner peripheral edge 17B. The centroid means a position where the area moments of the figure drawn by the inner peripheral edge 17B are balanced.

As shown in FIG. 5, the first pressure receiving spacer 25 is provided with a protrusion 25A that protrudes toward the plate 27 side. The plate 27 is provided with a hole 27B into which the protrusion 25A is fitted.

The projection 25A and the hole 27B are located outside the outer peripheral edge 17C of the transmission rod 17 projected on the plate 27, as shown in FIG. The cross-sectional shapes of the protrusion 25A and the hole 27B according to the present embodiment are oval. Note that the “oval” according to the present application includes an ellipse, a spindle shape, and the like.

The longitudinal direction of the ellipse does not matter. The “longitudinal direction of the ellipse” according to this embodiment is the tangential direction of the outer peripheral edge 17C at the intersection of the virtual peripheral line passing through the sectional center position O1 of the P screw 27A and the sectional center position O2 of the protrusion 25A and the outer peripheral edge 17C. Is almost parallel to.

2.3 Structure of First Pressure-Receiving Spacer As shown in FIG. 9, the second pressure-receiving spacer 25 has a second portion at a portion of the first pressure-receiving spacer 25 that faces the distal end 17A in the extending direction of the transmission rod 17 (hereinafter referred to as a load receiving portion 25B). A plurality of holes 26</b>A to 26</b>J that are depressed on the side frame 11 side, that is, on the speed reduction mechanism 23 side are provided. Note that the plurality of holes 26A to 26J may be either through holes that penetrate the reduction gear mechanism 23 or blind holes that do not penetrate.

The load receiving portion 25B is a region including a range surrounded by the “outer peripheral edge 17C of the transmission rod 17” projected on a portion of the first pressure receiving spacer 25 facing the plate 27. Then, at least two of the plurality of holes 26A to 26J (holes 26A to 26H in the present embodiment) are arranged substantially along the inner peripheral edge 17B of the transmission rod 17 projected on the load receiving portion 25B.

"The plurality of holes 26A to 26H are arranged so as to be substantially along the inner peripheral edge 17B" means, for example, the following cases.
(1) When a virtual line connecting the portions facing the inner peripheral edge 17B among the outlines of the plurality of holes 26A to 26H has a shape that is substantially similar to or congruent with the inner peripheral edge 17B (2) Center of each hole 26A to 26H An imaginary line connecting the lines (hereinafter referred to as a center placement line) substantially coincides with the inner peripheral edge 17B. The case of (2) above means, for example, the following states (a) to (c).

(A) A state in which the plurality of holes 26A to 26H are all located inside the inner peripheral edge 17B and the center placement line substantially coincides with the inner peripheral edge 17B. (b) The center of the plurality of holes 26A to 26H is inside the inner peripheral edge 17B and the inner peripheral edge 17B. A state in which the center placement lines are substantially aligned with the inner peripheral edge 17B by being scattered outside 17B. (c) A state in which the centers of the plurality of holes 26A to 26H are located outside the inner peripheral edge 17B and the center placement lines are substantially aligned with the inner peripheral edge 17B. Then, among the plurality of holes 26A to 26J, the plurality of holes 26A to 26H (hereinafter, referred to as peripheral holes 26A to 26H) arranged substantially along the inner peripheral edge 17B, as shown in FIG. In, the distances A1 to A8 between the adjacent holes are substantially the same.

Out of the plurality of holes 26A to 26J, holes other than the peripheral holes 26A to 26H, that is, the hole 26J (hereinafter, referred to as the central hole 26J) is provided on the centroid side of the figure drawn by the inner peripheral edge 17B. Further, the distances A1 to A12 of the adjacent holes including the distances A9 to A12 between the center hole 26J and the peripheral holes 26A to 26H are substantially the same.

The center hole 26J according to the present embodiment constitutes a screw hole of the P screw 27A. Therefore, at least the central hole 26J is a circular hole. Incidentally, the P screw 27A is a tapping screw. Therefore, before the P screw 27A is inserted into the center hole 26J, a female screw is not formed on the inner peripheral surface of the center hole 26J.

The peripheral holes 26A to 26H are holes formed in a substantially rectangular shape. This is because the imaginary line connecting the portions facing the inner peripheral edge 17B of the outer shape lines of the peripheral edge holes 26A to 26H has a shape that is substantially similar to or congruent to the inner peripheral edge 17B.

Portions of the peripheral holes 26A to 26H facing the center hole 26J are curved so as to draw an arc having a center of curvature on the side of the center hole 26J. This is because the distances A1 to A12 of the adjacent holes including the distances A9 to A12 between the central hole 26J and the peripheral holes 26A to 26H are substantially the same.

3. Features of back frame and drive device according to the present embodiment <Regarding plate fixing structure>
In the present embodiment, as described above, the side impact load acting on the first side frame 9 is transmitted to the second side frame 11 side via the transmission rod 17, the plate 27, the first pressure receiving spacer 25 and the second pressure receiving spacer 29. Be transmitted to. Therefore, even when a large side impact load acts on the back frame 7 from the seat width direction, the back frame 7 that can counteract the side impact load can be obtained.

Since the metal plate 27 is fixed to the first pressure receiving spacer 25, the load does not directly act on the resin first pressure receiving spacer 25, and the first pressure receiving spacer 25 is reinforced by the metal. As a result, the mechanical strength of the first pressure receiving spacer 25 including the plate 27 can be improved.

The P screw 27A is located in the inner peripheral edge 17B of the transmission rod 17 projected on the plate 27. This can prevent the transmission rod 17 from interfering with the P screw 27A when the transmission rod 17 is in contact with the plate 27.

Therefore, the entire tip 17A in the extending direction of the transmission rod 17 can be surely brought into contact with the plate 27, so that the side impact load acting on the first side frame 9 can be reliably transmitted to the second side frame 11. Become.

The P screw 27A according to the present embodiment has a cross-sectional center position substantially coincident with the centroid of the figure drawn by the inner peripheral edge 17B. Thereby, even if the transmission rod 17 is inclined, for example, the entire extension direction tip 17A of the transmission rod 17 can be reliably brought into contact with the plate 27.

The first pressure receiving spacer 25 is provided with a protrusion 25A protruding toward the plate 27 side, and the plate 27 is provided with a hole 27B into which the protrusion 25A is fitted. The protrusion 25A and the hole 27B are located outside the outer peripheral edge 17C of the transmission rod 17 projected on the plate 27. Thereby, the assembly worker can fix the plate 27 to the first pressure receiving spacer 25 with the P screw 27A in a state where the plate 27 is positioned by the protrusion 25A and the hole 27B.

Since the plate 27 is provided with the hole 27B into which the protrusion 25A is fitted, for example, even when the transmission rod 17 is greatly inclined, the extension direction tip 17A of the transmission rod 17 interferes with the protrusion 25A. There is no. Therefore, the entire tip 17A in the extending direction of the transmission rod 17 can be surely brought into contact with the plate 27.

The cross-sectional shapes of the protrusion 25A and the hole 27B are oval. As a result, the rotational displacement of the plate 27 is restricted by the protrusion 25A and the hole 27B. Therefore, the assembly worker can fix the plate 27 to the first pressure receiving spacer 25 in a state where the plate 27 is reliably positioned.

<About the structure of the first pressure receiving spacer>
The side impact load transmitted to the first pressure receiving spacer 25 via the transmission rod 17 acts on the load receiving portion 25B of the first pressure receiving spacer 25. Therefore, the thickness dimension of the portion of the load receiving portion 25B that is parallel to the load direction needs to be a dimension that can withstand the side impact load.

However, if the thickness dimension of the load receiving portion 25B is significantly different from the other portions, molding contraction (also referred to as "sink") occurs in the load receiving portion 25B during resin molding, and sufficient mechanical strength is secured. Can be difficult.

On the other hand, the load receiving portion 25B according to the present embodiment is provided with a plurality of holes 26A to 26J recessed on the second side frame 11 side, and the peripheral holes 26A to 26H are provided on the load receiving portion 25B. The transmission rods 17 are arranged substantially along the inner peripheral edge 17B of the transmission rod 17.

As a result, it is possible to prevent the thickness dimension of the load receiving portion 25B from being significantly different from that of other portions, and thus it is possible to suppress the occurrence of sink marks. Therefore, it becomes possible to secure sufficient mechanical strength in the load receiving portion 25B made of resin.

In the peripheral holes 26A to 26H, the distances A1 to A8 between the holes adjacent to each other in the arrangement direction are substantially the same. Thereby, the occurrence of sink marks can be surely suppressed.
In the plurality of holes 26A to 26J, the distances A1 to A12 between adjacent holes, including the distance between the center hole 26J and the peripheral holes 26A to 26H, are substantially the same. Thereby, the occurrence of sink marks can be surely suppressed.

(Other embodiments)
In the above-described embodiment, the center position of the cross section of the P screw 27A substantially coincides with the centroid of the figure drawn by the inner peripheral edge 17B. However, the invention disclosed in the present specification is not limited to this. That is, for example, the center position of the cross section of the P screw 27A may be deviated from the centroid.

In the above-described embodiment, the protrusion 25A and the hole 27B are provided for positioning on the outer side of the outer peripheral edge 17C. However, the invention disclosed in the present specification is not limited to this.

That is, for example, (a) the configuration in which the protrusion 25A and the hole 27B are eliminated, (b) the configuration in which the protrusion 25A and the hole 27B are inside the inner peripheral edge 17B, (c) the protrusion 25A on the plate 27 Alternatively, the first pressure receiving spacer 25 may be provided with the hole 27B.

The protrusion 25A and the hole 27B according to the above-described embodiment have an elliptical shape. However, the invention disclosed in the present specification is not limited to this. That is, for example, a shape such as a polygonal shape capable of exhibiting the rotation prohibition function is sufficient.

In the above-described embodiment, the metal plate 27 is fixed to the first pressure receiving spacer 25 by the P screw 27A located in the figure drawn by the inner peripheral edge 17B. However, the invention disclosed in the present specification is not limited to this. That is, for example, the plate 27 may be omitted, or the P screw 27A may be arranged outside the figure drawn by the inner peripheral edge 17B.

In the above-described embodiment, in the peripheral holes 26A to 26H, the space sizes A1 to A8 of the holes adjacent to each other in the arrangement direction are substantially the same. However, the invention disclosed in the present specification is not limited to this.

In the above-described embodiment, the plurality of holes 26A to 26J have substantially the same distance dimensions A1 to A12 of the adjacent holes including the distance between the center hole 26J and the peripheral holes 26A to 26H. However, the invention disclosed in the present specification is not limited to this.

The load receiving portion 25B according to the above-described embodiment is provided with a plurality of holes 26A to 26J depressed toward the second side frame 11 side, and the peripheral holes 26A to 26H are projected onto the load receiving portion 25B. The rods 17 are arranged so as to be substantially along the inner peripheral edge 17B.

However, the invention disclosed in the present specification is not limited to this. That is, for example, the peripheral holes 26A to 26H may be omitted, or the peripheral holes 26A to 26H may be arranged without being along the inner peripheral edge 17B.

In the above-described embodiment, the peripheral holes 26A to 26H partially overlap the inner peripheral edge 17B. However, the invention disclosed in the present specification is not limited to this. That is, for example, the virtual line connecting the portions facing the inner peripheral edge 17B of the outlines of the plurality of holes 26A to 26H may be located inside the inner peripheral edge 17B.

The first pressure receiving spacer 25 according to the above-described embodiment is indirectly fixed to the second side frame 11. However, the invention disclosed in the present specification is not limited to this. That is, the first pressure receiving spacer 25 may be directly fixed to the second side frame 11.

The first pressure receiving spacer 25 according to the above-described embodiment is fixed to the second side frame 11 via the drive device 20. However, the invention disclosed in the present specification is not limited to this. That is, for example, the first pressure receiving spacer 25 may be fixed to the lower panel 15 and indirectly fixed to the second side frame 11 via the lower panel 15.

The transmission rod 17 according to the above-described embodiment is fixed to the first side frame 9 via the frame bracket 19A and the like. However, the invention disclosed in the present specification is not limited to this. That is, for example, the transmission rod 17 may be fixed to only the lower panel 15.

The plate 27 according to the above-described embodiment is fixed to the first pressure receiving spacer 25 by the P screw 27A. However, the invention disclosed in the present specification is not limited to this. That is, for example, it may be fixed to the first pressure receiving spacer 25 with a rivet.

The transmission rod 17 according to the above-described embodiment has a square pipe shape. However, the invention disclosed in the present specification is not limited to this. That is, for example, a round pipe-shaped transmission rod 17, a solid round rod transmission rod 17, or the like may be used.

In the above-described embodiment, since the figure drawn by the inner peripheral edge 17B has a substantially rectangular shape, for example, the distance between the central hole 26J and the peripheral holes 26A, 26C, 26E, and 26G (hereinafter referred to as the diagonal distance distance). However, it was inevitably larger than the other spacing dimensions A1 to A12.

However, the invention disclosed in the present specification is not limited to this. That is, at least two of all the interval dimensions may be substantially the same, and all the interval dimensions may be substantially the same including the diagonal position interval dimension.

Specifically, (a) the configuration in which the figure drawn by the inner peripheral edge 17B is a circle and all the spacing dimensions are substantially the same, or (b) the hole shape of the central hole 26J and the peripheral hole 26A, 26C, 26E, 26G. The configuration may be such that all the spacing dimensions are substantially the same.

In the above-described embodiment, the present invention is applied to the front seat of a 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 cars, ships and aircrafts.

Furthermore, the present invention is not limited to the above-mentioned embodiments, as long as it conforms to the spirit of the invention described in the claims. Therefore, at least two of the above-described embodiments may be combined.

1... Vehicle seat 3... Seat cushion 4... Headrest 5... Seat back 7... Back frame 9... First side frame 11... Second side frame 17... Transmission rod 20... Drive device 21... Electric motor 23... Reduction mechanism 25... First pressure receiving spacer 25A... Projection portion 25B... Load receiving portion 26A to 26J... Hole 27... Plate 27A... P screw 29... Second pressure receiving spacer

Claims (5)

In a back frame that is applied to a vehicle seat having a seat back that supports the back of a seated person and that constitutes the skeleton of the seat back,
A first side frame disposed on one end side in the seat width direction and extending substantially vertically
A second side frame disposed on the other end side in the seat width direction and extending substantially vertically
A pipe-shaped transmission rod extending from the first side frame side to the second side frame side, the transmission rod transmitting the load acting on the first side frame to the second side frame side;
A pressure receiving spacer, which is directly or indirectly fixed to the second side frame at a position facing the tip of the transmission rod in the extending direction, and is made of resin and receives a load transmitted through the transmission rod. A spacer,
A metal plate disposed between the pressure receiving spacer and a tip in the extending direction of the transmission rod, and fixed to the pressure receiving spacer by a mechanical fastener.
A vehicle seat back frame in which the mechanical fastener is located within the inner periphery of the transmission rod projected onto the plate. The back frame for a vehicle seat according to claim 1, wherein the center position of the cross section of the mechanical fastener substantially coincides with the centroid of the figure drawn by the inner peripheral edge. The pressure receiving spacer is provided with a protrusion protruding toward the plate side,
The plate is provided with a hole into which the protrusion is fitted,
3. The vehicle seat back frame according to claim 1, wherein the protrusion and the hole are located outside an outer peripheral edge of the transmission rod projected on the plate. The vehicle seat back frame according to claim 3, wherein a cross-sectional shape of the protrusion and the hole is polygonal or oval. A first side frame disposed on one end side in the seat width direction, a second side frame disposed on the other end side in the seat width direction, and a pipe shape extending from the first side frame side to the second side frame side. A transmission rod, which is mounted on a back frame for a vehicle seat, which includes a transmission rod for transmitting a load acting on the first side frame to the second side frame side, and is fixed to the second side frame. In a drive device that generates a force for swinging the back frame,
An electric motor that generates driving force,
A reduction mechanism that reduces the rotation output of the electric motor,
A pressure receiving spacer fixed to the speed reducing mechanism at a position facing a tip end in the extending direction of the transmission rod, the pressure receiving spacer being made of resin and receiving a load transmitted through the transmission rod;
A metal plate disposed on the transmission rod side of the pressure receiving spacer and fixed to the pressure receiving spacer by a mechanical fastener,
A drive for a vehicle seat, wherein the mechanical fastener is configured to be located within an inner peripheral edge of the transmission rod projected onto the plate.