Cushion frame

Abstract

To disclose an example of a cushion frame, taking account of a case where a large load acts on the cushion frame.SOLUTION: A front end of a first reinforcing frame 15 is located on a front side from a center point OM, and at least a part of a rear pipe 14 projected on a virtual vertical plane overlaps the first reinforcing frame 15 projected on the virtual vertical plane. As a result, even when an inertial force acting on an occupant is input to a back frame and a large moment is consequently generated in the cushion frame, the cushion frame can resist the moment.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a cushion frame applied to a vehicle seat. [Background technology]

[0002] For example, in the cushion frame described in Patent Document 1, a reinforcing patch is attached to a part of the side frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-73184 Summary of the Invention [Problem to be solved by the invention]

[0004] In the event of a collision, the inertial force acting on the seat occupant is input to the back frame, which generates a large moment in the cushion frame connected to the base of the back frame. This disclosure discloses an example of a cushion frame that takes this into consideration. [Means for solving the problem]

[0005] A cushion frame (10) applied to a vehicle seat, the cushion frame (10) having a back frame connected to its rear end side, desirably has at least one of the following constituent features, for example.

[0006] That is, the constituent elements are a first side frame (11) arranged at one end of the seat width direction and extending in the front-to-rear direction of the seat, a second side frame (12) arranged at the other end of the seat width direction and extending in the front-to-rear direction of the seat, a first connecting member (13) extending in the seat width direction and connecting the front side of the first side frame (11) to the front side of the second side frame (12), a second connecting member (14) extending in the seat width direction and connecting the rear side of the first side frame (11) to the rear side of the second side frame (12), and a reinforcing frame (15) fixed to the first side frame (11) and reinforcing the first side frame (11).

[0007] It is desirable that the front end of the reinforcing frame (15) projected onto the imaginary plane is located forward of the midpoint (OM), and that at least a portion of the second connecting member (14) projected onto the imaginary plane overlaps with the reinforcing frame (15) projected onto the imaginary plane.

[0008] The imaginary plane is an imaginary plane perpendicular to the sheet width direction. The midpoint (OM) is the midpoint between the first center (O1) and the second center (O2). The first center (O1) is the center of the first connecting member (13) projected onto the imaginary plane. The second center (O2) is the center of the second connecting member (14) projected onto the imaginary plane.

[0009] As a result, even if the inertial force acting on the seated person is input to the back frame and a large moment is generated in the cushion frame (10), the cushion frame (10) can resist the moment.

[0010] Furthermore, the center of the load acting on the cushion frame (10), which is caused by the weight of the seated person, is usually located between the first center (O1) and the second center (O2). Therefore, the cushion frame (10) can effectively resist such load.

[0011] The cushion frame (10) may have the following configuration, for example. That is, the first connecting member (13) and the second connecting member (14) are rotatably connected to the first side frame (11) and the second side frame (12), and include a first lifter link (7C) that rotates integrally with the first connecting member (13) and extends in a direction perpendicular to the longitudinal direction of the first connecting member (13), and a second lifter link (7A) that rotates integrally with the second connecting member (14) and extends in a direction perpendicular to the longitudinal direction of the second connecting member (14). The rotating shaft (13) is provided with a link (7A), a sector gear (7E) that rotates integrally with the second connecting member (14), and an electric motor (7F) that is arranged on the opposite side of the sector gear (7E) across the first side frame (11) from the sector gear (7E), the electric motor (7F) generating a driving force to rotate the sector gear (7E), and the reinforcing frame (15) is arranged between the first side frame (11) and the sector gear (7E), and further, it is desirable that the reinforcing frame (15) is provided with a displacement regulating portion (15E) that protrudes toward the sector gear (7E).

[0012] As a result, in the cushion frame (10), the sector gear (7E) is restricted from being displaced beyond a predetermined position. The reinforcing frame (15) is provided with a wall-like first flange portion (11B) that is provided at one end side of the first side frame (11) in the vertical direction and protrudes from the one end side in the seat width direction, and a wall-like second flange portion (15D) that is provided at a portion of the reinforcing frame (15) opposite the first flange portion (11B) in the vertical direction and protrudes from the portion in the seat width direction, and when the fixing point between the electric motor (7F) and the first side frame (11) is defined as the motor fixing portion (Mf), it is desirable that the motor fixing portion (Mf) projected onto an imaginary horizontal plane is located inside the outer edge of the second flange portion (15D) projected onto the imaginary horizontal plane.

[0013] This can prevent a large change in rigidity at the motor fixing portion (Mf), making it difficult for stress to concentrate at the motor fixing portion (Mf), and ultimately preventing deformation from being induced around the motor fixing portion (Mf).

[0014] Furthermore, it is desirable that the second flange portion (15D) protrude in the opposite direction to the first flange portion (11B). This allows the neutral point to be positioned at a location where a member is present, thereby effectively ensuring rigidity.

[0015] Incidentally, in a C-shaped or U-shaped cross-sectional shape, the neutral point is located in a region where no members are present. On the other hand, in a Z-shaped or H-shaped cross-sectional shape, the neutral point is located in a region where members are present. A structure in which the neutral point is located in a region where members are present can effectively ensure rigidity.

[0016] Incidentally, the symbols in each of the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram showing a vehicle seat according to a first embodiment. [Figure 2] FIG. 2 is a view showing a cushion frame according to the first embodiment. [Figure 3] FIG. 2 is a view showing a cushion frame according to the first embodiment. [Figure 4] FIG. 2 is a partial enlarged view of the cushion frame according to the first embodiment. [Figure 5] FIG. 3 is an exploded view of the first side frame side according to the first embodiment. [Figure 6] 3A and 3B are views showing a first side frame and the like according to the first embodiment. [Figure 7] 3A and 3B are views showing a first side frame and the like according to the first embodiment. [Figure 8]FIG. 3 is a diagram showing a first reinforcing frame according to the first embodiment. [Figure 9] 3A and 3B are views showing a first side frame and the like according to the first embodiment. [Figure 10] 3A and 3B are views showing a first side frame and the like according to the first embodiment. [Figure 11] 3A and 3B are views showing a first side frame and the like according to the first embodiment. [Figure 12] 3A and 3B are views showing a first side frame and the like according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following "embodiments of the invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

[0019] This embodiment is an example in which the cushion frame according to the present disclosure is applied to a seat (hereinafter referred to as a vehicle seat) to be installed in a vehicle such as a car. Arrows and diagonal lines indicating directions in each figure are provided to facilitate understanding of the relationships between the figures and the shapes of components or parts.

[0020] Therefore, the cushion frame is not limited to the directions indicated in the drawings. The directions indicated in the drawings are directions when the vehicle seat according to the present embodiment is assembled to a vehicle. Diagonally shaded drawings do not always represent cross-sectional views.

[0021] At least one of a component or part that is described with a reference numeral is provided unless otherwise specified, such as "one." In other words, unless otherwise specified, two or more components may be provided. The cushion frame shown in the present disclosure includes at least one of the components, such as the component or part, that are described with a reference numeral and the structural parts shown in the drawings.

[0022] (First embodiment) <1. Overview of vehicle seats> As shown in Fig. 1, the vehicle seat 1 includes at least a seat back 3, a seat cushion 5, a lifter device 7, and a slide device 9. The seat back 3 is a portion for supporting the back of the seated occupant. The seat cushion 5 is a portion for supporting the buttocks of the seated occupant.

[0023] The lifter device 7 is a mechanism for vertically displacing the seat cushion 5. The slide device 9 is a mechanism for enabling the seat cushion 5 to be slidably displaced in the front-rear direction of the seat.

[0024] The seat back 3 is configured to include a back frame (not shown) and a cushioning material (not shown). The back frame is a member that forms the framework of the seat back 3. The cushioning material is configured to include an elastically deformable member such as urethane.

[0025] The seat cushion 5 is configured to include a cushion frame 10 and a cushion material (not shown). The cushion frame 10 is a member that forms the framework of the seat cushion 5. The cushion material is configured to include an elastically deformable member such as urethane.

[0026] <2. Details of cushion frame and lifter device, etc.> <2.1 Cushion frame configuration> As shown in FIGS. 2 and 3, the cushion frame 10 includes at least a first side frame 11, a second side frame 12, a front pipe 13, a rear pipe 14, a first reinforcing frame 15, a second reinforcing frame 16, and the like.

[0027] The first side frame 11 is a strength member disposed at one end of the seat width direction and extending in the front-rear direction of the seat. The second side frame 12 is a strength member disposed at the other end of the seat width direction and extending in the front-rear direction of the seat.

[0028] The front pipe 13 is an example of a first connecting member that extends in the seat width direction and connects the front side of the first side frame 11 to the front side of the second side frame 12. The rear pipe 14 is an example of a second connecting member that extends in the seat width direction and connects the rear side of the first side frame 11 to the rear side of the second side frame 12.

[0029] The front pipe 13 and the rear pipe 14 are rotatably connected to the first side frame 11 and the second side frame 12, respectively. In other words, the front pipe 13 and the rear pipe 14 are rotatable about a central axis that is parallel to the seat width direction.

[0030] The first reinforcing frame 15 is a reinforcing member that is fixed to the first side frame 11 and reinforces the first side frame 11. The second reinforcing frame 16 is a reinforcing member that is fixed to the second side frame 12 and reinforces the second side frame 12.

[0031] Incidentally, the first reinforcing frame 15 is fixed to the first side frame 11 by welding (spot welding in this embodiment). The second reinforcing frame 16 is fixed to the second side frame 12 by welding (spot welding in this embodiment).

[0032] The back frame is directly or indirectly connected to the rear ends of the first side frame 11 and the second side frame 12. The back frame according to this embodiment is fixed to the rear end of the cushion frame 10 via a recliner (not shown) or the like.

[0033] 2, the cushion frame 10 according to this embodiment also includes a tilt mechanism 17. The tilt mechanism 17 is a mechanism for changing the angle of the front end side of the seat cushion 5.

[0034] The tilt mechanism 17 is configured to include tilt arms 17A and 17B, a front panel 17C, an actuator (not shown), etc. The tilt arm 17A extends in the front-rear direction of the seat, and its rear end is rotatably connected to the first side frame 11.

[0035] Tilt arm 17B extends in the front-rear direction of the seat, and its rear end is rotatably connected to second side frame 12. Front panel 17C is a panel-shaped member that connects the front ends of tilt arms 17A and 17B.

[0036] The actuator generates a force that causes the tilt arms 17A and 17B to pivot relative to the first side frame 11 and the second side frame 12. When the actuator is activated, the angle of the front end of the seat cushion 5 changes.

[0037] <2.2 Lifter device> As shown in Figures 1 to 4, the lifter device 7 is configured to include at least first lifter links 7C and 7D, second lifter links 7A and 7B, a sector gear 7E (see Figure 4), and an electric motor 7F (see Figure 3).

[0038] The first lifter links 7C, 7D are members whose upper ends are fixed to the front pipe 13, extend in a direction perpendicular to the longitudinal direction of the front pipe 13, and rotate integrally with the front pipe 13.

[0039] The first lifter link 7C is fixed to the front pipe 13 on the first side frame 11 side. The first lifter link 7D is fixed to the front pipe 13 on the second side frame 12 side.

[0040] The second lifter links 7A, 7B are members whose upper ends are fixed to the rear pipe 14, extend in a direction perpendicular to the longitudinal direction of the rear pipe 14, and rotate integrally with the rear pipe 14.

[0041] The second lifter link 7A is fixed to the rear pipe 14 on the first side frame 11 side. The second lifter link 7B is fixed to the rear pipe 14 on the second side frame 12 side.

[0042] As shown in FIGS. 1 to 3, the lower end sides of the first lifter links 7C, 7D and the second lifter links 7A, 7B are rotatably connected to the movable rails 9A of the corresponding slide devices 9.

[0043] Specifically, the lower ends of the lifter links 7A and 7C are connected to the slide device 9 arranged on the first side frame 11 side. The lower ends of the lifter links 7B and 7D are connected to the slide device 9 arranged on the second side frame 12 side.

[0044] Each slide device 9 is configured with a movable rail 9A and a fixed rail 9B. Each fixed rail 9B is a rail member that is fixed directly or indirectly to the vehicle. Each movable rail 9A is a member that can slide relative to the corresponding fixed rail 9B.

[0045] 4, the sector gear 7E is a sector gear that rotates integrally with the rear pipe 14. Note that the sector gear 7E according to this embodiment is fixed to the second lifter link 7A and rotates integrally with the rear pipe 14 together with the second lifter link 7A.

[0046] The electric motor 7F is an actuator that generates a driving force to rotate the sector gear 7E. The electric motor 7F is disposed on the opposite side of the sector gear 7E across the first side frame 11.

[0047] That is, the sector gear 7E and the first reinforcing frame 15 are disposed on the second side frame 12 side relative to the first side frame 11 (hereinafter referred to as the inside of the first side frame 11). Hereinafter, the side opposite the inside with the first side frame 11 in between will be referred to as the outside.

[0048] The first reinforcing frame 15 is disposed inside the first side frame 11, between the first side frame 11 and the sector gear 7E. The electric motor 7F is disposed outside the first side frame 11.

[0049] The output shaft of the electric motor 7F passes through the first side frame 11 and the first reinforcing frame 15 and reaches the inside. A pinion 7G that meshes with a sector gear 7E is provided on the output shaft. The tip side of the output shaft is supported by a bracket 18.

[0050] <Details of the first side frame and first reinforcing frame> 5, the first reinforcing frame 15 is disposed inside (on the left side in FIG. 5) the first side frame 11. The first side frame 11 has at least a plate surface 11A and first flange portions 11B, 11C, etc.

[0051] The plate surface 11A is a wall-like portion perpendicular to the sheet width direction. The first flange portions 11B and 11C are wall-like convex walls extending in the sheet width direction. The first flange portions 11B and 11C are provided at least between the first center O1 and the second center O2.

[0052] The first center O1 refers to the center of the front pipe 13 projected onto an imaginary plane (hereinafter referred to as an imaginary vertical plane) perpendicular to the seat width direction. The second center O2 refers to the center of the rear pipe 14 projected onto the imaginary vertical plane. The midpoint between the first center O1 and the second center O2 is referred to as a central point OM.

[0053] The first flange portion 11B extends inward (to the left in FIG. 5) from the upper end side of the plate surface 11A. The first flange portion 11C extends inward (to the left in FIG. 5) from the lower end side of the plate surface 11A.

[0054] The first flange portion 11B projected onto an imaginary horizontal plane (hereinafter referred to as the imaginary horizontal plane) includes at least a center point OM projected onto the imaginary horizontal plane (see FIG. 6). The rear end of the first flange portion 11C projected onto the imaginary horizontal plane substantially coincides with the center point OM projected onto the imaginary horizontal plane (see FIG. 5).

[0055] As shown in Figure 7, the front end 15A of the first reinforcement frame 15 projected onto the imaginary vertical plane is located forward of the center point OM, and at least a portion of the rear pipe 14 projected onto the imaginary vertical plane overlaps with the first reinforcement frame 15 projected onto the imaginary vertical plane.

[0056] In this embodiment, the rear end of the first reinforcing frame 15 is substantially aligned with the rear end of the first side frame 11. For this reason, the first reinforcing frame 15 in this embodiment is provided with a female thread portion 15B for fastening and fixing the back frame.

[0057] The female thread portion 15B is a portion where a female thread is formed on the inner circumferential surface of the cylindrical portion. The cylindrical portion is a portion formed by burring a plate material. A bolt (not shown) for fastening and fixing the back frame passes through the first side frame 11 and screws into the female thread portion 15B of the first reinforcing frame 15.

[0058] 8, the first reinforcing frame 15 has at least a plate surface 15C and a second flange portion 15D. The plate surface 15C is a wall-like portion perpendicular to the seat width direction. The second flange portion 15D is a wall-like convex wall extending in the seat width direction.

[0059] The second flange portion 15D is provided on the first reinforcing frame 15 at a portion opposite to the first flange portion 11B in the up-down direction. Specifically, the second flange portion 15D is provided on the lower end side of the first reinforcing frame 15.

[0060] 10, the motor fixing portion Mf projected onto the imaginary horizontal plane is located inside the outer edge of the second flange portion 15D projected onto the imaginary horizontal plane (the thick solid line in FIG. 10). The motor fixing portion Mf refers to the location of the first side frame 11 where the electric motor 7F is fixed (see FIG. 9).

[0061] The second flange portion 15D projected onto the imaginary vertical plane is continuous at least in the range from the center point OM to the second center O2. In other words, the first flange portion 11C and the second flange portion 15D projected onto the imaginary vertical plane cooperate to form a flange in the range from the first center O1 to the second center O2.

[0062] 11, the second flange portion 15D protrudes in the opposite direction to the first flange portion 11B. That is, the first flange portion 11B is provided on the upper end side of the first side frame 11. The second flange portion 15D is provided on the lower end side of the first side frame 11, in a region where the first flange portion 11C is not present.

[0063] The first flange portion 11B according to this embodiment protrudes inward (to the left in this embodiment) from the plate surface 11A, and the second flange portion 15D according to this embodiment protrudes outward (to the right in this embodiment) from the plate surface 15C.

[0064] 12, a displacement restriction portion 15E is provided on the first reinforcing frame 15. The displacement restriction portion 15E protrudes toward the sector gear 7E and restricts the sector gear 7E from being displaced toward the first side frame 11 beyond a predetermined position.

[0065] Displacement restricting portion 15E according to this embodiment is formed by burring plate surface 15C. In addition to displacement restricting portion 15E and female thread portion 15B, first reinforcing frame 15 is also provided with other functional portions such as swing shaft portions of tilt arms 17A and 17B and harness support portions.

[0066] Incidentally, the second side frame 12 and the second reinforcing frame 15 have roughly the same configuration as the first side frame 11 and the first reinforcing frame 15, except that they do not have the electric motor 7F, the sector gear 7E, the second flange portion 15D, etc.

[0067] 3. Features of the cushion frame according to this embodiment As shown in Figure 7, the front end of the first reinforcement frame 15 in this embodiment is located forward of the center point OM, and at least a portion of the rear pipe 14 projected onto an imaginary vertical plane overlaps with the first reinforcement frame 15 projected onto the imaginary vertical plane.

[0068] As a result, even if the inertial force acting on the seated person is input to the back frame and a large moment is generated in the cushion frame 10, the cushion frame 10 can resist the moment.

[0069] Furthermore, the center of a load acting on the cushion frame 10, which is caused by the weight of a seated person or the like, is usually located between the first center O1 and the second center O2. Therefore, the cushion frame 10 can effectively resist such a load.

[0070] The first reinforcing frame 15 is provided with a displacement restriction portion 15E that protrudes toward the sector gear 7E side. This restricts the sector gear 7E of the cushion frame 10 from being displaced beyond a predetermined position.

[0071] As shown in FIG. 10, the motor fixing portion Mf projected onto the imaginary horizontal plane is located inside the outer edge of the second flange portion 15D projected onto the imaginary horizontal plane. This can prevent a large change in rigidity at the motor fixing portion Mf. Therefore, stress concentration at the motor fixing portion Mf can be prevented. As a result, deformation induced around the motor fixing portion Mf can be prevented.

[0072] Incidentally, if the motor fixing portion Mf is configured such that its rigidity changes significantly, stress tends to concentrate on the motor fixing portion Mf, which may induce large deformation centered on the motor fixing portion Mf.

[0073] Furthermore, as shown in Fig. 11, the second flange portion 15D protrudes in the opposite direction from the first flange portion 11B. This allows the neutral point to be positioned at a location where a member is present, thereby effectively ensuring rigidity.

[0074] (Other embodiments) In the above-described embodiment, the rear end of the first reinforcing frame 15 is substantially aligned with the rear end of the first side frame 11. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, the rear end of the first reinforcing frame 15 is aligned with the rear end of the rear pipe 14.

[0075] The first reinforcing frame 15 according to the above-described embodiment is provided with the displacement restricting portion 15E, the female thread portion 15B, the swing shaft portions of the tilt arms 17A and 17B, the harness support portion, and the like. However, the present disclosure is not limited to this. The first reinforcing frame 15 may be provided with these components eliminated.

[0076] In the above-described embodiment, the motor fixing portion Mf projected onto the imaginary horizontal plane is located inside the outer edge of the second flange portion 15D projected onto the imaginary horizontal plane, as shown in FIG. 10 . However, the present disclosure is not limited to this. That is, in the present disclosure, for example, the motor fixing portion Mf projected onto the imaginary horizontal plane may be located outside the outer edge of the second flange portion 15D projected onto the imaginary horizontal plane.

[0077] In the above-described embodiment, the second flange portion 15D protrudes in the opposite direction to the first flange portion 11B. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the second flange portion 15D protrudes in the same direction as the first flange portion 11B, for example.

[0078] In the above-described embodiment, the first flange portion 11B protrudes inward. However, the present disclosure is not limited to this. That is, the present disclosure may have a configuration in which the first flange portion 11B protrudes outward, for example.

[0079] The sector gear 7E according to the above-described embodiment is fixed to the second lifter link 7A and rotates integrally with the rear pipe 14 together with the second lifter link 7A. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the sector gear 7E is directly fixed to the rear pipe 14, for example.

[0080] In the above-described embodiment, one end in the width direction of the sheet corresponds to the right end of the sheet, and the other end in the width direction of the sheet corresponds to the left end of the sheet. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that one end in the width direction of the sheet corresponds to the left end of the sheet, and the other end in the width direction of the sheet corresponds to the right end of the sheet.

[0081] In the above-described embodiment, the vehicle seat according to the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited thereto. That is, the present disclosure can also be applied to seats used in vehicles such as railway cars, ships, and aircraft, as well as stationary seats used in theaters, homes, etc.

[0082] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0083] 1... Vehicle seat 3... Seat back 5... Seat cushion 7... Lifter device 9... Slide device 10... Cushion frame 11... First side frame 11A… Board surface 11B... First flange part 11C... First flange 12... Second side frame 13... Front pipe 14... Rear pipe 15... First reinforcement frame 15D... Second flange 15E... Displacement control section

Claims

1. A cushion frame applied to a vehicle seat, the cushion frame having a back frame connected to a rear end thereof, a first side frame disposed at one end side in the seat width direction and extending in the seat front-rear direction; a second side frame disposed on the other end side in the seat width direction and extending in the seat front-rear direction; a first connecting member extending in a seat width direction and connecting a front side of the first side frame and a front side of the second side frame; a second connecting member extending in the seat width direction and connecting a rear side of the first side frame and a rear side of the second side frame; a reinforcing frame fixed to the first side frame, the reinforcing frame reinforcing the first side frame; When the center of the first connecting member projected onto an imaginary plane perpendicular to the seat width direction is defined as a first center, the center of the second connecting member projected onto the imaginary plane is defined as a second center, and the midpoint between the first center and the second center is defined as a central point, A cushion frame in which the front end of the reinforcing frame projected onto the imaginary plane is located forward of the center point, and at least a portion of the second connecting member projected onto the imaginary plane overlaps with the reinforcing frame projected onto the imaginary plane.

2. the first connecting member and the second connecting member are rotatably connected to the first side frame and the second side frame, a first lifter link that rotates integrally with the first connecting member and extends in a direction perpendicular to the longitudinal direction of the first connecting member; a second lifter link that rotates integrally with the second connecting member and extends in a direction perpendicular to the longitudinal direction of the second connecting member; a sector gear that rotates integrally with the second connecting member; an electric motor disposed on an opposite side of the sector gear with the first side frame therebetween, the electric motor generating a driving force for rotating the sector gear; the reinforcing frame is disposed between the first side frame and the sector gear, The cushion frame according to claim 1, further comprising a displacement restriction portion on the reinforcing frame that protrudes toward the sector gear and restricts the sector gear from being displaced beyond a predetermined position.

3. a wall-like first flange portion provided at one end of the first side frame in the up-down direction and protruding from the one end in the seat width direction; The reinforcing frame is provided at a portion opposite the first flange portion in the up-down direction, and includes a wall-like portion and a second flange portion protruding from the portion in the seat width direction, 3. The cushion frame of claim 2, wherein when the fixed point between the electric motor and the first side frame is defined as a motor fixing portion, the motor fixing portion projected onto an imaginary horizontal plane is located inside the outer edge of the second flange portion projected onto the imaginary horizontal plane.

4. The cushion frame according to claim 3 , wherein the second flange portion projects in a direction opposite to the first flange portion.

Images