JP7633503B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat that includes a frame having an inward surface that faces the portion of the seat cushion that supports the occupant, and a motor that is positioned at least partially closer to that portion than the inward surface.

Patent Document 1 discloses a soundproofing panel that is incorporated into the seat back of a vehicle seat. The soundproofing panel is disposed behind a blower. The front surface of the soundproofing panel is formed with an uneven surface that diffusely reflects the operating noise emitted from the blower. The diffuse reflection attenuates the operating noise of the blower. In this way, harsh sounds in the interior space are suppressed.

JP 2013-177027 A

However, although the uneven surface of the soundproofing panel reduces harsh sounds, it also reflects operating noises toward the occupant leaning against the seat back. Therefore, it has not been possible to effectively provide quietness for the occupant sitting in the vehicle seat.

The present invention aims to provide a vehicle seat that can provide sufficient and effective quietness for seated occupants.

According to a first aspect of the present invention, there is provided a vehicle seat comprising: a frame having an inward surface facing a portion of a cushion pad that supports an occupant; a motor that is at least partially positioned closer to the portion than the inward surface; and a sound-absorbing member that is attached to the frame and connects via a through hole to a space in contact with the motor at a position closer to the portion than the inward surface, the frame comprising: a seatback side frame having the inward surface facing a portion of the cushion pad that supports a waist of the occupant; and a lumbar support member that is connected to the seatback side frame and supports the sound-absorbing member .

According to the second aspect, in addition to the configuration of the first aspect, the frame has a seatback side frame having an inward surface that faces the part of the cushion pad that supports the occupant's lower back, and a lumbar support member that is connected to the seatback side frame and supports the sound-deadening member.

According to the third aspect, in addition to the configuration of the second aspect, the sound-deadening member is at least partially integrated into the lumbar support member.

According to the fourth aspect, in addition to the configuration of the first aspect, the vehicle seat further includes a pressure-receiving member that is formed of an elastic body, is attached to the seat cushion frame, receives the seat cushion pad from below, and supports the sound-deadening member in a position facing the motor.

According to the fifth aspect, in addition to the configuration of the fourth aspect, the sound absorbing member is hinged to be rotatable around the edge of the flat plate of the pressure receiving member, and is displaceable between an open position away from the flat plate and an assembled position facing the motor and defining the resonance space between the flat plate and the movable body having the through hole.

According to the sixth aspect, in addition to the configuration of the fifth aspect, the displacement body is formed with a rib that surrounds the through hole and extends toward the flat plate piece at the assembly position.

According to the seventh aspect, in addition to the configuration of the first aspect, the vehicle seat has a frame including left and right seat cushion side frames that support the seat cushion pad of the cushion pad, and a holding frame that connects the seat cushion side frames to each other and has an inward surface that faces the seat cushion pad, and the holding frame includes a plate piece having an opening for receiving the motor, a first wall piece that is continuous with the plate piece, stands upright from the edge of the opening, and has the through hole at a position facing the motor, and a second wall piece that is continuous with the edge of the plate piece, extends parallel to the first wall piece, and forms the resonance space.

According to the eighth aspect, in addition to the configuration of the first aspect, the frame of the vehicle seat includes left and right seat cushion side frames that support the seat cushion pad of the cushion pad, and a retaining frame that connects the seat cushion side frames to each other and has an inward surface that faces the seat cushion pad, and the sound-deadening member includes a hook piece that engages with the retaining frame based on elastic deformation to position the sound-deadening member on the retaining frame.

According to the ninth aspect, in addition to the configuration of the eighth aspect, the sound absorbing member includes a main body that faces the motor at a position away from the motor, and an auxiliary body that is connected to the main body and disposed between the main body and the motor, forms the resonance space between the main body and the auxiliary body, and has the through hole at a position facing the motor.

According to a tenth aspect of the present invention, there is provided a vehicle seat including a frame having an inward surface that faces a portion of the seat cushion that supports an occupant, a motor that is at least partially positioned closer to the portion than the inward surface, and a sound-deadening member that is attached to the frame, has a through hole that opens at a position closer to the portion than the inward surface, and defines a space that is connected to the through hole.

According to the eleventh aspect, in addition to the configuration of the tenth aspect, the frame has left and right seatback side frames each having an inward surface that faces the portion of the seat cushion that supports the occupant's lower back, and a seatback lower frame that connects the left and right seatback side frames and defines the through hole, and a back cover that faces the through hole from the rear and defines the space between the seatback side frame and the seatback lower frame is supported on the seatback side frame.

According to the first aspect, when the motor is operating, the operating noise of the motor is blocked by the frame and transmitted toward the part supporting the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant.

According to the second aspect, when the motor in the seat back is operating, the operating noise of the motor is blocked by the seat back side frame and transmitted toward the part supporting the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant. Since the sound-deadening member is attached to the frame via the lumbar support member, simple installation work can be achieved from the front of the seat back side frame.

According to the third aspect, the installation work of the sound-absorbing member can be simplified.

According to the fourth aspect, when the seat cushion is in operation, the operating noise of the motor is blocked by the seat cushion frame and transmitted toward the part supporting the thighs of the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant. Since the sound-deadening member is attached to the seat cushion frame via the pressure-receiving member, simple installation work can be achieved by assembling the sound-deadening member to the pressure-receiving member in advance.

According to the fifth aspect, a part of the pressure-receiving member, which is an existing component, is used to form the resonance space, so that the increase in the volume and weight of the sound-absorbing member can be suppressed.

According to the sixth aspect, a closed space can be established by the action of the rib. Since the flat plate piece and the displacement body are connected by a hinge, the closed space can be easily positioned relative to the through hole.

According to the seventh aspect, when the seat cushion is in operation, the operating noise of the motor is blocked by the support frame and transmitted toward the part supporting the thighs of the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant. Since the first wall piece and the second wall piece of the support frame function as sound-proofing members, an increase in the number of parts required to achieve the sound-proofing effect can be avoided. An increase in the number of steps in the assembly work can be avoided.

According to the eighth aspect, when the seat cushion is in operation, the operating noise of the motor is blocked by the holding frame and transmitted toward the part supporting the thighs of the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant. Since the sound-deadening member elastically engages with the holding frame by the function of the hook piece, the sound-deadening member can be easily attached to the holding frame without using tools. Simple installation work can be realized.

According to the ninth aspect, a through hole and a resonance space can be established in the sound deadening member by connecting an auxiliary body to the main body. The positional relationship between the through hole and the resonance space can be established in advance. A simple installation procedure can be achieved when installing the sound deadening member.

According to the tenth aspect, when the motor is operating, the operating noise of the motor is blocked by the frame and transmitted toward the part supporting the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant.

According to the eleventh aspect, when the motor in the seat back is operating, the operating noise of the motor is blocked by the seat back side frame and transmitted toward the part supporting the occupant. The operating noise of the motor enters the resonance space via the through hole. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant. Since the resonance space is formed based on the seat back lower frame and back cover, which are existing components, an increase in the number of parts can be avoided when achieving the sound-deadening effect.

1 is a perspective view showing a schematic overall configuration of a vehicle seat according to a first embodiment of the present invention; FIG. 2 is a perspective view showing a schematic structure of a seat frame. FIG. 2 is a perspective view showing a schematic configuration of a seat cushion pad and a seat back pad. FIG. 2 is a conceptual diagram showing a configuration of a sound deadening member. FIG. 2 is a conceptual diagram showing a configuration of a sound deadening member. FIG. 13 is a conceptual diagram showing the configuration of a sound deadening member at least partially integrated into a lumbar support. 10 is a conceptual diagram showing a retaining frame incorporated in a vehicle seat according to a second embodiment of the present invention. FIG.

Embodiments of the present invention will be described below with reference to the attached drawings. In the following description, front/rear, left/right, and up/down refer to directions as seen by an occupant seated in a vehicle seat in a normal seating position (e.g., the basic position when driving).

Figure 1 shows a schematic diagram of the overall configuration of a vehicle seat according to a first embodiment of the present invention. The vehicle seat 11 includes a slide rail 13 connected to a floor panel 12 that functions as one component of the vehicle's monocoque structure, a seat cushion 14 that is supported by the slide rail 13 so as to be movable in the front-rear direction and supports the buttocks and thighs of an occupant, a seat back 15 that is connected to the seat cushion 14 so as to be swingable in the front-rear direction around a swing axis SX and supports the back of the occupant, and a headrest 16 that is supported by the upper end of the seat back 15 and supports the head of the occupant. The seat back 15 is formed with a lumbar support 17 that supports the occupant's lower back from the left and right. The vehicle seat 11 is configured for a left seat. When the vehicle seat 11 is used for a right seat, the left and right sides of the vehicle seat 11 can be interchanged.

The seat cushion 14, seat back 15, and headrest 16 each have a covering material 14a, 15a, and 16a that encases the internal padding. The covering materials 15a and 16a are attached to the outer surface of the pad by following the depressions in the pad due to the action of the hanging thread 18. The details of the pad will be described later.

The seat cushion 14 includes a side cover 19. A first switch 21a and a second switch 21b are attached to the side cover 19. The first switch 21a is formed as a knob that is long in the front-rear direction. When the first switch 21a is operated forward, the seat cushion 14 and the seat back 15 move forward. When the first switch 21a is operated rearward, the seat cushion 14 and the seat back 15 move rearward. When the first switch 21a is operated upward, the seat cushion 14 and the seat back 15 move upward. When the first switch 21a is operated downward, the seat cushion 14 and the seat back 15 move downward. The second switch 21b is formed as a knob that is long in the up-down direction. When the second switch 21b is operated forward, the seat back 15 oscillates forward around the oscillating axis SX. When the second switch 21b is operated rearward, the seat back 15 oscillates rearward around the oscillating axis SX.

The headrest 16 is fixed to a headrest pillar 22 that extends upward from the upper end of the seat back 15. The headrest pillar 22 is supported by the seat back 15 so that it can be displaced axially in the up and down direction. The height of the headrest 16 can be adjusted according to the displacement of the headrest pillar 22.

As shown in FIG. 2, the vehicle seat 11 includes a seat frame 23 that supports a pad. The seat frame 23 includes a seat cushion frame 24 that supports the pad of the seat cushion 14, and a seat back frame 25 that is connected to the seat cushion frame 24 so as to be swingable around the swing axis SX and supports the pad of the seat back 15. The seat cushion frame 24 includes a seat cushion side frame 29 that is connected to the base frame 26 by a link mechanism 27 and includes a vertically movable frame 28 that supports the pad of the seat cushion 14 on the base frame 26, a pan frame 32 that connects the seat cushion side frames 29 to each other at the front end of the seat cushion 14, a connecting pipe 33 that connects the seat cushion side frames 29 to each other at the rear end of the seat cushion 14, and a holding frame 34 that connects the seat cushion side frames 29 to each other in front of the connecting pipe 33. In addition, in the seat cushion side frame 29, the vertically movable frame 28 may be integrated with the base frame 26, and the link mechanism 27 may be omitted.

The base frame 26 extends parallel to the slide rail 13 and is guided by the slide rail 13 so as to be freely movable back and forth in the longitudinal direction. The holding frame 34 extends parallel to the swing axis SX and connects the left and right base frames 26 to each other. The vertical movement frame 28 extends parallel to the base frame 26 above the base frame 26. The pan frame 32 connects the left and right vertical movement frames 28 to each other and supports the pad of the seat cushion 14 on its surface. The connecting pipe 33 connects the left and right vertical movement frames 28 to each other and forms a frame that cooperates with the vertical movement frames 28 and the pan frame 32 to support the weight of the occupant.

The link mechanism 27 includes a link member 35 having one end connected to the base frame 26 so as to be rotatable about a horizontal axis FH extending in the left-right direction, and the other end connected to the vertically movable frame 28 so as to be rotatable about a horizontal axis SH extending in the left-right direction parallel to the horizontal axis FH. The link member 35 guides the vertical movement of the vertically movable frame 28 relative to the base frame 26 around the horizontal axis FH.

A pressure-receiving member 36 made of an elastic material is attached to the seat cushion frame 24 to receive the pad of the seat cushion 14 from below. The pressure-receiving member 36 includes a number of S springs 37 that are placed between the pan frame 32 and the connecting pipe 33, and flat plate pieces 38 that are attached to the S springs 37 and regulate the elastic deformation of the S springs 37. Each S spring 37 extends forward and backward in a zigzag shape. The zigzag shape is formed by alternating wires that extend forward and backward and wires that extend left and right.

An electric forward/backward movement device 39 is attached to the base frame 26. The electric forward/backward movement device 39 has an electric motor 41 supported by the holding frame 34. The electric motor 41 generates power in response to the supply of electricity. The power is supplied based on the operation of the first switch 21a. The power of the electric motor 41 causes the base frame 26 to move forward/backward along the slide rail 13.

An electric vertical movement device 42 is attached to the seat cushion side frame 29 of the seat cushion frame 24. The electric vertical movement device 42 is supported by the vertical movement frame 28 and includes an actuator 43 connected to the link mechanism 27. The actuator 43 includes an electric motor 44 arranged outside the vertical movement frame 28 and generating power in response to the supply of electricity, and a gear box 45 that is fixed to the vertical movement frame 28, receives the electric motor 44 on the mounting surface, and houses a power transmission mechanism. The transmission mechanism can include, for example, a worm fixed to the drive shaft of the electric motor 44, a worm wheel that cooperates with the worm to form a worm gear, a driven gear fixed to the link member 35 around the horizontal axis SH, and a group of gears that mesh with each other in order to transmit power from the worm wheel to the driven gear. In response to the power of the electric motor 44, the link member 35 is caused to rotate relative to the vertical movement frame 28 around the horizontal axis SH. Electric power is supplied based on the operation of the first switch 21a. The power of the electric motor 44 causes the vertical movement of the vertical movement frame 28 around the horizontal axis FH. Note that if the link mechanism 27 described above is omitted, the electric vertical movement device 42 is omitted.

A support shaft 47 is assembled into the seat cushion frame 24 coaxially with the swing axis SX above and behind the connecting pipe 33. The support shaft 47 is formed, for example, from a hollow metal tube. Metal tubes have high rigidity in the axial direction. The support shaft 47 is sandwiched between the left and right vertical movement frames 28. The seat back frame 25 is supported by the support shaft 47.

The seatback frame 25 includes seatback side frames 48 connected to the inside of each vertically movable frame 28 by support shafts 47, an upper frame 49 connecting the upper ends of the seatback side frames 48 to each other, and a lower frame 51 connecting the lower ends of the seatback side frames 48 to each other. A lumbar support member 52 that supports the pad of the lumbar support 17 is connected to the seatback side frames 48. A headrest pillar guide 53 that supports the headrest pillar 22 so that it can slide vertically is fixed to the upper frame 49.

An electric reclining device 54 is attached to the seatback side frame 48 of the seatback frame 25. The electric reclining device 54 includes an actuator 55 attached to the seatback side frame 48 around the swing axis SX. The actuator 55 includes an electric motor 56a that is disposed inside the seatback side frame 48 and generates power in response to the supply of electric power, and a base 56b that is fixed to the seatback side frame 48 and receives the electric motor 56a on the mounting surface. The power of the electric motor 56a is converted into a driving force around the swing axis SX by the action of a transmission mechanism. The transmission mechanism can include, for example, a worm fixed to the drive shaft of the electric motor 56a, and a worm wheel that cooperates with the worm to form a worm gear and is fixed to the support shaft 47 around the swing axis SX. Electric power is supplied based on the operation of the second switch 21b. The power of the electric motor 56a causes the seat back frame 25 to swing back and forth around the swing axis SX relative to the seat cushion frame 24. The actuator 55 is covered with a sound-deadening member 57 supported by the lumbar support member 52.

3, the seat cushion 14 further includes a seat cushion pad 58 supported by the seat cushion frame 24 and wrapped in the upholstery material 14a. The seat back 15 further includes a seat back pad 59 supported by the seat back frame 25 and wrapped in the upholstery material 15a. The seat cushion pad 58 and the seat back pad 59 are formed from an elastic material such as urethane foam. Here, the lumbar support member 52 may support a lumbar support pad that is separated from the seat back pad 59 and wrapped in the upholstery material 15a.

As shown in FIG. 4, the support frame 34 has an inward surface 34a that faces from below toward the seat cushion pad 58 that supports the thighs of the occupant. The inward surface 34a is defined by a plate piece 62 that defines an opening 61 that receives the electric motor 41. The electric motor 41 is disposed at least partially closer to the seat cushion pad 58 than the inward surface 34a.

The sound-absorbing member 63 is supported on the pressure-receiving member 36 at a position facing the electric motor 41. The sound-absorbing member 63 is attached to the seat cushion frame 24 via the pressure-receiving member 36. The sound-absorbing member 63 defines a resonance space 64 at a position closer to the seat cushion pad 58 than the inward surface 34a. The resonance space 64 is connected to a space in contact with the electric motor 41 via a through hole 65. The sound-absorbing member 63 has a displacement body 67 that is rotatably connected to the edge of the flat plate piece 38 by a living hinge 66. The displacement body 67 is displaced between an open position away from the flat plate piece 38 and an assembly position where the displacement body 67 is opposed to the electric motor 41 and defines the resonance space 64 between the flat plate piece 38 and the displacement body 67. A plurality of through holes 65 are formed in the displacement body 67. The through hole 65 is opposed to the electric motor 41. At the assembly position, the displacement body 67 is formed with ribs 68 that surround the through holes 65 and extend toward the flat plate piece 38. Here, the ribs 68 define a resonance space 64 for each through hole 65.

5, the seatback side frame 48 has an inward surface 48a that faces the part of the seatback pad 59 that supports the occupant's lower back. The inward surface 48a is defined by a plate piece 71 that is held in a position perpendicular to the swing axis SX. A front piece 71a is formed at the front edge of the plate piece 71, which is continuous with the plate piece 71 and spreads toward the part that supports the occupant's lower back, and supports the lumbar support member 52. A rear piece 71b is formed at the rear edge of the plate piece 71, which is continuous with the plate piece 71 and spreads toward the part that supports the occupant's lower back. A restriction piece 71c is formed at the open end of the rear piece 71b, which is continuous with the rear piece 71b and spreads toward the front piece 71a. The electric motor 56a is disposed in the space between the front piece 71a and the rear piece 71b, closer to the part that supports the occupant's lower back than the inward surface 48a.

The sound deadening member 57 defines a resonance space 73 connected to the space adjacent to the electric motor 56a via a through hole 72 at a position closer to the part supporting the occupant's lower back than the inward surface 48a. The sound deadening member 57 has a first wall piece 74a that faces the electric motor 56a and positions the through hole 72 relative to the electric motor 56a, an engagement piece 74b that extends from the first wall piece 74a and engages with the restriction piece 71c from the front to connect the first wall piece 74a to the rear piece 71b of the seat back side frame 48, and a fastening piece 74c that extends from the first wall piece 74a and is overlapped with the lumbar support member 52 and is joined to the lumbar support member 52 by a fastening member 75. A second wall piece 74d that has a wall body that faces the first wall piece 74a and forms the resonance space 73 between the first wall piece 74a and the first wall piece 74a is fixed to the first wall piece 74a. The fastening member 75 may be, for example, a screw.

A sound deadening member 76 is attached to the seat back side frame 48 as an auxiliary. The sound deadening member 76 has a through hole 77 that opens at a position closer to the part supporting the occupant's waist than the inward surface 48a, and defines a space 78 connected to the through hole 77. Here, the sound deadening member 76 uses the lower frame 51 of the seat back frame 25 and a back cover 79 that covers the lower frame 51 from the rear. The back cover 79 can be formed, for example, from a resin molded body. The back cover 79 is attached from the rear to a seat back side cover 81 that covers the left and right seat back side frames 48 from the outside, and forms a space 78 between the lower frame 51 and the back cover 79. A through hole 77 is formed in the lower frame 51. The through hole 77 is connected to the space 78.

A space 82 can be formed between the seatback side cover 81 and the seatback side frame 48. The space 82 can be connected to a space adjacent to the electric motor 56a via a through hole 83 defined in the seatback side frame 48. The through hole 83 can be disposed in a position on the plate piece 71 of the seatback side frame 48 facing the electric motor 56a.

When the first switch 21a is operated forward or backward, power is supplied to the electric motor 41. The electric motor 41 operates. Driving force is taken from the drive shaft of the electric motor 41. Based on the driving force, the seat cushion 14 and the seat back 15 can be moved forward and backward.

At this time, the operating noise of the electric motor 41 is blocked by the retaining frame 34 of the seat cushion frame 24 and transmitted toward the area supporting the occupant's thighs. The operating noise of the electric motor 41 enters the resonance space 64 via the through hole 65. The operating noise can be silenced based on Helmholtz resonance. In this way, quietness can be effectively ensured for the seated occupant.

Prior to the installation of the sound-absorbing member 63, as shown in FIG. 4B, the flat plate 38 is fixed to the S-spring 37. When the flat plate 38 is fixed, the displacement body 67 can be moved from the open position to the installation position by the action of the living hinge 66. When the displacement body 67 is placed on the flat plate 38, the resonance space 64 can be formed between the flat plate 38 and the displacement body 67. In this way, the pressure-receiving member 36 is formed. Since the sound-absorbing member 63 is attached to the seat cushion frame 24 via the pressure-receiving member 36, a simple installation operation can be realized by assembling the sound-absorbing member 63 to the pressure-receiving member 36 in advance. Moreover, since a part of the pressure-receiving member 36, which is an existing component, is used to form the resonance space 64, the increase in the volume occupied by the sound-absorbing member 63 and the increase in weight can be suppressed.

When the displacement body 67 is in the assembled position, a rib 68 is formed that surrounds the through hole 65 and extends toward the flat plate piece 38. The rib 68 serves to establish a closed space. The flat plate piece 38 and the displacement body 67 are connected by a hinge, so that the closed space can be easily positioned relative to the through hole 65.

When the second switch 21b is operated forward or backward, power is supplied to the electric motor 56a. The electric motor 56a operates. Driving force is taken from the drive shaft of the electric motor 56a. The forward and backward movement of the seat back 15 can be realized based on the driving force.

At this time, the operating noise of the electric motor 56a is blocked by the seatback side frame 48 and transmitted toward the part supporting the occupant. The operating noise of the electric motor 56a enters the resonance space 73 via the through hole 72. The operating noise can be silenced based on Helmholtz resonance. In this way, sufficiently effective quietness can be established for the seated occupant. Since the sound-deadening member 63 is attached to the seat frame 23 via the lumbar support member 52, simple installation work can be achieved from the front of the seatback side frame 48.

In the sound deadening member 76, the operating noise of the electric motor 56a enters the space 78 via the through hole 77. The operating noise can be silenced based on Helmholtz resonance. In this way, quietness for seated occupants can be further improved. In the sound deadening member 76, the resonance space is formed based on the existing components, the lower frame 51 and the back cover 79, so an increase in the number of parts required to achieve the sound deadening effect can be avoided.

6, the sound deadening member 57 may be at least partially integrated into the lumbar support member 52. Here, for example, the first wall piece 74a is continuous with the lumbar support member 52. When the lumbar support member 52 is fixed to the seat back side frame 48, the first wall piece 74a can position the through hole 72 at the electric motor 56a. The second wall piece 74d is attached to the first wall piece 74a. In this way, the installation work of the sound deadening member 57 can be simplified.

Figure 7 shows a holding frame 91 that is incorporated into a vehicle seat 11a according to a second embodiment of the present invention. In the vehicle seat 11a, the holding frame 91 is used instead of the above-mentioned holding frame 34. The configuration of the vehicle seat 11a is the same as that of the vehicle seat 11, except for the above-mentioned sound-deadening member 63.

The support frame 91 has an inward surface 91a that faces from below toward the seat cushion pad 58 that supports the thighs of the occupant. The inward surface 91a is defined by a plate piece 93 that defines an opening 92 that receives the electric motor 41. The electric motor 41 is disposed at least partially closer to the seat cushion pad 58 than the inward surface 91a.

The holding frame 91 includes a first wall piece 95 that is continuous with the plate piece 93, stands upright from the edge of the opening 92, and has a through hole 94 at a position facing the electric motor 41, and a second wall piece 97 that is continuous with the edge of the plate piece 93 and spreads parallel to the first wall piece 95 to form a resonance space 96. In the seat cushion 14, when the seat cushion 14 is in operation, the operating sound of the electric motor 41 is blocked by the holding frame 91 and transmitted toward the part supporting the thigh of the occupant. The operating sound of the electric motor 41 enters the resonance space 96 via the through hole 94. The operating sound can be silenced based on Helmholtz resonance. In this way, quietness can be sufficiently and effectively established for the seated occupant. Since the first wall piece 95 and the second wall piece 97 of the holding frame 91 function as sound-deadening members, an increase in the number of parts can be avoided in achieving the sound-deadening effect. An increase in the number of assembly steps can be avoided.

A sound-deadening member 98 can be further attached to the holding frame 91. The sound-deadening member 98 defines a resonance space 101 connected to the space in contact with the electric motor 41 via a through hole 99 at a position closer to the part supporting the thigh of the occupant than the inward surface 91a. The sound-deadening member 98 has a hook piece 102 that engages with the holding frame 91 based on elastic deformation and positions the sound-deadening member 98 on the holding frame 91. The operating noise of the electric motor 41 enters the resonance space 101 via the through hole 99. The operating noise can be silenced based on Helmholtz resonance. In this way, quietness for the seated occupant can be further improved. Since the sound-deadening member 98 elastically engages with the holding frame 91 due to the function of the hook piece 102, the sound-deadening member 98 can be easily attached to the holding frame 91 without using tools. Simple installation work can be realized.

Here, the sound deadening member 98 includes a main body 103 that faces the electric motor 41 at a position away from the electric motor 41, and an auxiliary body 104 that is connected to the main body 103 and disposed between the main body 103 and the electric motor 41, forms a resonance space 101 between the main body 103, and has a through hole 99 at a position facing the electric motor 41. The through hole 99 and the resonance space 101 can be established in the sound deadening member 98 by connecting the auxiliary body 104 to the main body 103. The positional relationship between the through hole 99 and the resonance space 101 can be established in advance. A simple installation operation can be realized when installing the sound deadening member 98.

11...vehicle seat, 11a...vehicle seat, 24...seat cushion frame, 34...frame (holding frame), 34a...inward surface, 36...pressure-receiving member, 38...flat plate piece, 41...motor (electric motor), 48...frame (seat back side frame), 48a...inward surface, 51...(seat back) lower frame, 52...lumbar support member, 56a...motor (electric motor), 57...sound-absorbing member, 58...cushion pad (seat cushion pad) , 59...cushion pad (seat back pad), 63...sound deadening member, 64...resonance space, 65...through hole, 66...hinge (living hinge), 67...displacement body, 72...through hole, 73...resonance space, 76...sound deadening member, 77...through hole, 78...space, 79...back cover, 92...opening, 93...plate piece, 94...through hole, 95...first wall piece, 96...resonance space, 97...second wall piece, 98...sound deadening member, 99...through hole, 101...resonance space, 102...hook piece, 103...main body, 104...auxiliary body.

Claims (8)

a frame having an inward surface that faces a portion of the cushion pad that supports an occupant;
a motor disposed at least partially closer to the site than the inwardly facing surface;
a sound-absorbing member attached to the frame, at a position closer to the part than the inward surface, for defining a resonance space connected to a space in contact with the motor via a through hole ;
the frame includes a seatback side frame having an inward surface that faces a portion of the cushion pad that supports a lower back of the occupant, and a lumbar support member that is connected to the seatback side frame and supports the sound-deadening member . The vehicle seat according to claim 1,
The vehicle seat, wherein the sound deadening member is at least partially integrated with the lumbar support member. a frame having an inward surface that faces a portion of the cushion pad that supports an occupant;
a motor disposed at least partially closer to the site than the inwardly facing surface;
a sound-absorbing member attached to the frame, at a position closer to the part than the inward surface, for defining a resonance space connected to a space in contact with the motor via a through hole;
a seat cushion frame that receives a seat cushion pad from below and a pressure-receiving member that supports the sound deadening member at a position facing the motor. The vehicle seat according to claim 3,
The sound-absorbing member is hinged so as to be freely rotatable relative to the edge of the flat piece of the pressure-receiving member, and is displaceable between an open position in which it is moved away from the flat piece and an assembly position in which it faces the motor and defines the resonance space between itself and the flat piece, and has a displacement body having the through hole. The vehicle seat according to claim 4,
The vehicle seat, wherein the displacement body is formed with a rib surrounding the through hole and extending toward the flat plate piece at the assembly position. a frame having an inward surface that faces a portion of the cushion pad that supports an occupant;
a motor disposed at least partially closer to the site than the inwardly facing surface;
a sound-absorbing member attached to the frame, at a position closer to the part than the inward surface, for defining a resonance space connected to a space in contact with the motor via a through hole;
the frame includes left and right seat cushion side frames that support a seat cushion pad of the cushion pad, and a holding frame that connects the seat cushion side frames to each other and has an inward surface that faces the seat cushion pad,
The vehicle seat is characterized in that the retaining frame comprises a plate piece having an opening for receiving the motor, a first wall piece continuing from the plate piece, standing upright from the edge of the opening, and having the through hole in a position facing the motor, and a second wall piece continuing from the edge of the plate piece, extending parallel to the first wall piece, to form the resonance space. a frame having an inward surface that faces a portion of the cushion pad that supports an occupant;
a motor disposed at least partially closer to the site than the inwardly facing surface;
a sound-absorbing member attached to the frame, at a position closer to the part than the inward surface, for defining a resonance space connected to a space in contact with the motor via a through hole;
the frame includes left and right seat cushion side frames that support a seat cushion pad of the cushion pad, and a holding frame that connects the seat cushion side frames to each other and has an inward surface that faces the seat cushion pad,
The vehicle seat, wherein the sound deadening member includes a hook piece that is elastically deformed to engage with the holding frame and position the sound deadening member relative to the holding frame. The vehicle seat according to claim 7,
The sound-absorbing member includes a main body facing the motor at a position away from the motor, and an auxiliary body connected to the main body and disposed between the main body and the motor, forming the resonance space between the main body and the auxiliary body, and having the through hole at a position facing the motor.

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