JP2011218901A - Seat back board for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back board for vehicle that reduces vibration of a vehicle seat without increasing the number of components and vehicle mass.SOLUTION: The seat back board 1 for vehicle is mounted on a seat frame 50 installed on a cabin floor. The seat back board is provided with: a faceplate body part 10; an upper fastening part 20 provided on the upper side of the body part 10 so as to be locked to the upper end of the seat frame 50; and a lower fastening part 30 provided at the lower end of the body part 10 and on which the lower end of the seat frame 50 is placed so as to be fixed with screws 37. The lower fastening part 30 includes: each hollow cylindrical cushion case 31 provided on one face of the body part 10; each cylinder 33 inserted and fixed to the central part inside a cylinder of each cushion case 31 and has a through-hole to which the screw 37 is inserted; and each liquid-sealed cushion part 35 sealed with liquid and housed in an air gap between the inner-peripheral surface inside the cylinder of each cushion case 31 and the outer-peripheral surface of each cylinder 33.

Description

  The present invention relates to a vehicle seat backboard, and for example, relates to a vehicle seat backboard having a function of reducing vibration of a seat installed in a vehicle interior.

  Conventionally, it has been proposed to reduce resonance vibration with respect to vibration input from a floor by attaching a dynamic damper or mass to a vehicle seat installed in a vehicle interior such as an automobile.

For example, in Patent Document 1, as shown in FIG. 8, a bracket 105 including an upper support wall 105A and a lower support wall 105B is fixed to a seat back frame (not shown) of a vehicle seat W, The mass body 102 is disposed between the support walls (105A, 105B), the upper surface of the mass body 102 and the upper support wall 105A, and the lower surface of the mass body 102 and the lower support wall 105B. It has been proposed that the elastic bodies 104A, 104B, 104C, and 104D are provided, respectively, and the dynamic damper 100 is configured by the mass body 102 and the elastic bodies 104A, 104B, 104C, and 104D.
According to the above configuration, when vibration is input from the vehicle floor to the seat W, when the seat W resonates and the vibration is amplified, the dynamic damper 100 provided in the seat back frame suppresses the vibration. Resonance vibration is reduced.

  Patent Document 2 has a seat back including a back frame, a pad made of a foam material configured to wrap the back frame, and a skin covering the pad in order to reduce vibration of the seat. In a vehicle seat, it is disclosed that a mass body (mass) is placed in a pad and supported to function as a dynamic damper.

Japanese Patent Laid-Open No. 2003-226179 JP 2001-161489 A

However, all of the above-described conventional techniques are designed to install separate parts (dynamic dampers and masses) on the vehicle seat, so that the number of parts increases and the weight of the vehicle increases. have.
For this reason, the above-described conventional method has caused an increase in manufacturing cost due to an increase in the number of parts and a deterioration in fuel consumption due to the weight of the vehicle.

  The present invention has been made to solve the above technical problem, and an object of the present invention is to reduce the vibration of a vehicle seat without increasing the number of parts and increasing the mass of the vehicle. It is to provide a seat back board.

  The present invention made to solve the above-mentioned problems is a vehicle seat backboard attached to a seat frame installed on a passenger compartment floor, and a main body portion formed in a face plate shape, and an upper side of the main body portion An upper fastening portion having a hook portion that is engaged with an upper end portion of the seat frame, and a lower end portion of the main body portion that is placed on the lower end portion of the main body portion and is fixed to the seat frame with screws. A lower fastening part, and the lower fastening part is inserted and fixed to a hollow cylindrical case part provided on one surface of the lower end of the main body part, and a center part in a cylinder of the case part, and A liquid seal cushion part in which a liquid stored in a space between a cylindrical body in which a screw is inserted and a through hole formed therein and an inner peripheral surface in the cylinder of the case part and an outer peripheral surface of the cylindrical body is enclosed It is characterized by having There.

According to the above configuration, the vibration energy input to the seat is attenuated by the liquid-sealed cushion portion of the lower fastening portion attached to the seat frame (due to the fluid flow), thereby reducing the vibration of the seat. be able to.
That is, according to the present invention, it is not necessary to attach another component (such as a dynamic damper or a mass) for reducing vibration as in the prior art described above, and thus the number of components is not increased. Further, according to the present invention, since it is not necessary to attach another part (dynamic damper, mass, etc.) to the seat, it is possible to reduce the weight as compared with the above-described prior art.

  In addition, the liquid seal cushion part includes a hollow cylindrical outer elastic part fitted on the inner peripheral surface of the case part, an inner elastic part fitted on the outer peripheral surface of the cylindrical body, and the outer elastic part. And a liquid sealed in a gap formed between the inner elastic portions, and a damping adjustment screw that penetrates the side surface and presses the outer peripheral portion of the outer elastic portion. The damping adjustment screw is used to adjust the cross-sectional area of the flow path of the liquid by changing the amount of elastic deformation of the outer elastic portion by changing the load pressing the outer elastic portion. It is desirable.

According to the above configuration, the attenuation peak can be adjusted by adjusting the cross-sectional area of the flow path of the enclosed liquid with the attenuation adjusting screw.
Therefore, the vehicle seat backboard of the present invention can cope with a wide range of frequencies, and can be generally applied to a plurality of types of vehicles.

The upper fastening portion is preferably formed of an elastic material.
As described above, the upper fastening portion locked to the upper end portion of the seat frame is formed of an elastic material, so that the seat frame can be attached with a degree of freedom.
In addition, with the above configuration, the upper fastening portion functions as a spring that connects the main body portion and the seat frame. As a result, the vibration from the seat frame is transmitted to the main body portion 10 through the upper fastening portion that functions as a spring.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle seat backboard which reduces the vibration of a vehicle seat can be provided, without causing the increase in a number of parts and the mass increase of a vehicle.

It is the perspective view which showed the state with which the vehicle seat backboard of embodiment of this invention was mounted | worn with the seat frame. It is the schematic diagram which looked at the state by which the vehicle seat backboard of embodiment of this invention was mounted | worn with the seat frame from the side surface. It is the schematic diagram shown in order to demonstrate the attachment method to the seat frame of the vehicle seat backboard of embodiment of this invention. It is the schematic diagram which expanded and showed the lower fastening part enclosed with the broken line A of FIG. It is the schematic diagram which expanded and showed the upper fastening part enclosed with the broken line B of FIG. It is the schematic diagram which showed the cross section of the lower fastening part of the vehicle seat backboard of embodiment of this invention. It is the schematic diagram shown in order to demonstrate the damping principle of the vibration by the vehicle seat back board of embodiment of this invention. It is a perspective view of the vehicle seat provided with the vibration isolating structure of the prior art.

Hereinafter, the structure of a vehicle seat backboard having a vibration reducing function according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
Here, FIG. 1 is a perspective view showing a state in which the vehicle seat backboard according to the embodiment of the present invention is mounted on the seat frame. FIG. 2 is a schematic view of a state in which the vehicle seat backboard of the present embodiment is mounted on the seat frame, as viewed from the side.
FIG. 3 is a schematic view for explaining a method of attaching the vehicle seat backboard of the embodiment of the present invention to the seat frame. FIG. 4 is an enlarged schematic view showing a lower fastening portion surrounded by a broken line A in FIG. FIG. 5 is an enlarged schematic view of the upper fastening portion surrounded by a broken line B in FIG. FIG. 6 is a schematic view showing a cross section of the lower fastening portion of the vehicle seat backboard of the present embodiment.
In FIG. 1 to FIG. 6, for convenience of explanation, cushion materials (seat cushion and seat back) attached to the seat frame are omitted.

As shown in FIGS. 1 to 3, a vehicle seat back board (hereinafter simply referred to as “seat back board”) 1 of the present embodiment is a vehicle seat (hereinafter referred to as a vehicle seat) installed on a vehicle floor of a vehicle such as an automobile. (Hereinafter simply referred to as “seat”) is attached to the rear end portion of the seat frame 50, and is configured to reduce seat vibration caused by vibrations of the engine and tires transmitted from the floor.
Here, the seat frame 50 is formed of a hollow tube made of metal or the like, for example, and a rectangular frame-like cushion frame 51 to which a seat cushion (not shown) for supporting a seated occupant is attached, and the cushion. And a back frame 52 that is erected behind the frame 51 and to which a seat back (not shown) is attached.

Specifically, the cushion frame 51 includes a pair of vertical frames 51a and 51b arranged opposite to each other in the front-rear direction of the vehicle, and a pair of horizontal frames 51c that connect both front and rear ends of the pair of vertical frames 51a and 51b. 51d.
Further, a screw hole 51d1 (see FIG. 3) passes through the lateral frame 51d on the rear side of the cushion frame 51, and a lower fastening portion 30 of the seat back board 1 to be described later is used by using the screw hole 51d1. It can be fixed.

  The back frame 52 includes a pair of upper and lower frames 52a and 52b extending upward from the left and right ends of the cushion frame 51 (left and right ends of the horizontal frame 51d), and upper ends of the pair of upper and lower frames 52a and 52b. And a horizontal frame 52c.

Further, the seat back board 1 is provided with a substantially rectangular face plate-shaped main body portion 10 made of a synthetic resin, and is provided on the upper side of the main body portion 10 and is locked to an upper end portion (the horizontal frame 52c) of the seat frame 50. The upper fastening portion 20 and the lower end portion (the horizontal frame 51d) of the seat frame 50 are placed on the lower end of the main body portion 10, and are mounted on the seat frame 50 (the horizontal frame 51d) with screws 37 (see FIG. 3). And a lower fastening portion 30 to be fixed.
In the illustrated example, two upper fastening portions 20 and two lower fastening portions 30 are formed on the seat back board 1, but the number of the upper fastening portions 20 and the lower fastening portions 30 is merely an example. It is.

Specifically, as shown in FIG. 5, the upper fastening portion 20 includes a belt-like arm portion 21 whose base end is fixed to the upper end side of one surface (front surface) of the main body portion 10 and extends upward, and the arm portion 21. And a hook portion 23 which is formed at the front end of the seat frame and can be locked to the seat frame 50. In the illustrated example, the hook portion 23 is bent in an arc shape so as to be locked to the seat frame 50, but is not particularly limited thereto.
In the present embodiment, the upper fastening portion 20 is formed of an elastic material such as rubber.
In this way, by forming the upper fastening portion 20 locked to the upper end portion of the seat frame 50 with an elastic material, the seat frame 50 can be attached with a degree of freedom, and the upper fastening portion 20 It functions as a spring that connects the main body 10 and the seat frame 50.

  4 and 6, the lower fastening portion 30 has a hollow cylindrical shape in which an upper surface 31a and a lower surface 31b (see FIG. 6) provided on one surface (front surface) of the lower end of the main body 10 are formed. Between the cushion case (case part) 31, the cylinder 33 inserted and fixed in the center of the cylinder of the cushion case 31, and between the inner peripheral surface of the cylinder of the cushion case 31 and the outer peripheral surface of the cylinder 33 The liquid-sealed cushion part 35 (35a, 35b, 35c) accommodated in the space | gap is provided. The cushion case 31 and the cylinder 33 are arranged concentrically.

Here, the cushion case 31 is formed of a synthetic resin, and is integrally formed with the main body 10 by, for example, resin injection molding.
Moreover, the cylinder 33 is formed with metals, such as iron and stainless steel, and is provided with the through-hole which penetrates up-and-down both ends. A screw 37 for fastening to the cushion frame 50 is inserted through the through hole.

Further, as shown in FIG. 6, the liquid seal cushion portion 35 includes a hollow cylindrical outer elastic portion 35 a fitted inside the inner circumferential surface of the cushion case 31 and an inner side fitted outside the outer circumferential surface of the cylindrical body 33. A liquid sealing portion 35c obtained by enclosing a liquid in a gap formed between the elastic portion 35b, the outer elastic portion 35a, and the inner elastic portion 35b is provided. Note that the upper and lower ends of the liquid seal portion 35c are closed by the cushion case 31 (the upper surface 31a and the lower surface 31b).
Both the outer elastic portion 35a and the inner elastic portion 35b are formed of an elastically deformable elastic material such as rubber.

Also, the cushion case 31 has a pair of screw holes (not shown) passing through opposite positions on the side surfaces thereof, and the damping adjustment screws 36 are inserted into the screw holes, respectively. It has become.
The damping adjustment screw 36 is configured such that the tip of the shaft portion is in contact with the outer peripheral surface of the outer elastic portion 35a and can press the outer elastic portion 35a.
Then, the amount of elastic deformation of the outer elastic portion 35a is changed by changing the load that presses the outer elastic portion 35a according to the tightening degree of the damping adjustment screw 36, thereby adjusting the area (cross-sectional area) of the liquid flow path. Can be done.

Next, a procedure for attaching the seat back board 1 to the seat frame 50 will be described.
Specifically, first, as shown in FIGS. 3 and 5, the hook portion 23 is locked to the upper end portion (lateral frame 52 c) of the back frame 52 constituting the seat frame 50, and the seat frame 50 is seated on the seat frame 50. Attach the upper end of the backboard 1.
Next, the rear lower end (lateral frame 51 d) of the seat frame 50 is placed on the upper surface of the lower fastening portion 30 of the seat back board 1, and the seat frame 50 is inserted into the through hole of the cylindrical body 33 of the lower fastening portion 30. The screw hole 51d1 is aligned. Then, the screw 37 is inserted into the through hole and the screw hole 51d1, and the nut 38 is attached and tightened.
Thereby, the seat back board 1 is attached to the seat frame 50.

According to the structure of the seat back board 1 attached to the seat frame 50 as described above, the vibration of the seat can be attenuated by the flow of the liquid in the liquid seal cushion portion 35.
Further, with the above configuration, a damper structure in which the main body 10 of the seatback board 1 becomes a mass (mass body) and the “upper fastening portion 20, the outer elastic portion 35a and the inner elastic portion 35b of the lower fastening portion 30” serve as springs. It is formed.

Specifically, as shown in FIG. 7, the vibration S from the engine or tire is transmitted to the seat frame 50 via the floor FL of the passenger compartment (the seat comes to vibrate).
According to this embodiment, the vibration S transmitted to the seat is the liquid-sealed cushion portion 35 (the outer elastic portion 35a, the lower fastening portion 30 of the main body portion 10 of the seat back board 1 attached to the seat frame 50). Since the liquid sealing portion 35c and the inner elastic portion 35b) are attenuated, the vibration of the sheet is reduced.
Further, the damper structure in which the main body portion 10 becomes a mass (mass body), and the “upper fastening portion 20, the outer elastic portion 35a and the inner elastic portion 35b of the lower fastening portion 30” serve as springs has a damping function against vibrations of the seat. Demonstrated.

Further, the seat back board 1 of the present embodiment changes the amount of elastic deformation of the outer elastic portion 35a that covers the outer peripheral portion of the liquid sealing portion 35c according to the tightening of the damping adjustment screw 36 provided in the cushion case 31. The area (cross-sectional area) through which the liquid sealed in the portion 35c passes can be adjusted.
As a result, the attenuation peak can be adjusted by the attenuation adjusting screw 36, and a wide range of frequencies can be handled. That is, the seat back board 1 of the present embodiment can be used for a plurality of types of vehicles for general purposes.

As described above, in the present embodiment, the liquid vibration cushion portion 35 is provided in the lower fastening portion 20 of the seat back board 1 attached to the seat frame 50, thereby reducing the vibration of the seat.
Further, according to the present embodiment, the main body 10 itself of the seatback board 1 becomes a mass (mass body), and the “upper elastic part 35, the outer elastic part 35 a and the inner elastic part 35 b of the lower fastening part 30” are springs. The damper structure is formed, and the damping function for the vibration of the seat is exhibited.
As described above, in the present embodiment, the seat back board 1 itself attached to the seat is provided with a function of reducing the vibration of the seat. There is no need to install separate parts (dynamic damper, mass, etc.), and the number of parts does not increase. Moreover, in this embodiment, since it is not necessary to attach another component (a dynamic damper, a mass, etc.) to a sheet | seat, weight reduction can be achieved compared with the thing of the prior art mentioned above.

That is, according to the backboard 1 of the present embodiment, the vibration of the vehicle seat can be reduced without causing an increase in the number of parts and an increase in the mass of the vehicle.
In addition, this invention is not limited to embodiment mentioned above, A various change is possible within the range of the summary.

For example, in the above-described embodiment, two upper fastening portions 20 and two lower fastening portions 30 are formed, but the number of the upper fastening portions 20 and the lower fastening portions 30 is the number of the seat frame 50 or the seat back board. It is designed appropriately according to the shape of 1.
Further, the shape and structure of the seat frame 50 described above are merely examples.
Moreover, the seat back board 1 of this embodiment is applicable also to vehicles (railway vehicles etc.) other than a motor vehicle.

DESCRIPTION OF SYMBOLS 1 Vehicle seat back board 10 Main-body part 20 Upper fastening part 21 Arm part (upper fastening part)
23 hook part (upper fastening part)
30 Lower fastening part 31 Cushion case (lower fastening part)
31a Upper surface (cushion case (lower fastening part))
31b bottom surface (cushion case (lower fastening part))
33 cylinder (cushion case (lower fastening part))
35 Liquid seal cushion (lower fastening part)
35a Outer elastic part (liquid seal cushion part (lower fastening part))
35b Inner elastic part (liquid seal cushion part (lower fastening part))
35c Liquid seal part (Liquid seal cushion part (lower fastening part))
36 Damping adjustment screw (lower fastening part)
37 screw 38 nut 50 seat frame 51 cushion frame (seat frame)
51a, 51b Vertical frame (cushion frame (seat frame))
51c, 51d Horizontal frame (cushion frame (seat frame))
51d1 screw hole (cushion frame (seat frame))
52 Back frame (seat frame)
52a, 52b Upper and lower frames (back frame (seat frame))
52c Horizontal frame (back frame (seat frame))

Claims (3)

A vehicle seat backboard attached to a seat frame installed on a passenger compartment floor,
A main body formed in a face plate shape;
An upper fastening portion having a hook portion provided on an upper side of the main body portion and locked to an upper end portion of the seat frame;
A lower fastening portion that is provided at a lower end of the main body portion and on which the lower end portion of the seat frame is placed and fixed to the seat frame with a screw;
The lower fastening portion is
A hollow cylindrical case provided on one side of the lower end of the main body,
A cylindrical body in which a through hole through which the screw is inserted is formed and fixed to a central portion in the cylinder of the case portion;
A vehicular seat backboard comprising: a liquid-sealed cushion portion in which a liquid stored in a gap between an inner peripheral surface in a cylinder of the case portion and an outer peripheral surface of the cylindrical body is enclosed. . The liquid-sealed cushion portion includes a hollow cylindrical outer elastic portion fitted on the inner peripheral surface of the case portion, an inner elastic portion externally fitted on the outer peripheral surface of the cylindrical body, the outer elastic portion, and the A liquid enclosed in a gap formed between the inner elastic portions,
On the side surface of the case portion is inserted a damping adjustment screw that penetrates the side surface and presses the outer peripheral portion of the outer elastic portion,
The damping adjustment screw can adjust the cross-sectional area of the flow path of the liquid by changing the amount of elastic deformation of the outer elastic portion by changing the load pressing the outer elastic portion. The vehicle seat backboard according to claim 1.   3. The vehicle seat backboard according to claim 1, wherein the upper fastening portion is formed of an elastic material.

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