JP5904091B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat having a seat frame and a seat pad provided in contact with the seat frame.

  2. Description of the Related Art Conventionally, there is known a vehicle seat provided with a sound absorbing device (resonator) that absorbs various vibration sounds transmitted in a seat back by a resonance effect in a cavity (Patent Document 1). Specifically, the sound absorbing device is provided in an iron pipe constituting the upper frame of the seat back frame, and communicates with a hole (opening) formed in the outer peripheral surface of the iron pipe. It is formed as a hollow portion composed of a resonance space defined in an iron pipe.

Japanese Utility Model Publication No. 1-212641

  However, the conventional technology has a complicated configuration in which a plurality of partition walls for partitioning the resonance space are formed in the iron pipe. The present invention has been created as a solution to the above problems, and the problem to be solved by the present invention is to form a resonator in a simple form on a vehicle seat.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
A first invention is a vehicle seat having a seat frame and a seat pad provided in contact with the seat frame. On the surface where the seat frame and the seat pad are in contact, a through hole formed in the seat frame and a recess formed in the seat pad so as to communicate with the through hole are formed. A Helmholtz resonator having an opening and a recess as a resonance space is formed.

  According to the first aspect of the present invention, there is provided a Helmholtz resonator in which a through hole is formed in a seat frame and a recess is formed in a seat pad. It is formed. In this way, the resonator can be formed in a simple form on the vehicle seat.

  The second invention is the following configuration in the first invention described above. The recess formed in the seat pad is formed in a narrowed shape in which the opening is fitted and opened in a through hole formed in the seat frame.

  According to the second aspect of the present invention, the recess formed in the seat pad is assembled in a state of being positioned with respect to the through hole formed in the seat frame. Therefore, the function as a resonator is exhibited well. In addition, since it is difficult for a gap to be formed between the recess of the seat pad and the through hole of the seat frame, a resonance space having a predetermined width can be formed.

  According to a third invention, in the first or second invention described above, the seat frame is formed by a hollow pipe, and the through hole is formed as a hole penetrating the inside and the outside of the hollow pipe.

  According to the third aspect of the invention, the vibration sound transmitted through the hollow pipe can be satisfactorily absorbed by the resonator communicating with the hollow pipe.

  According to a fourth invention, in any one of the first to third inventions described above, the seat frame is configured as an upper frame forming an upper skeleton of the seat back frame, and a through hole is formed in the upper frame. .

  According to the fourth aspect of the invention, the vibration sound transmitted through the upper frame of the seat back frame close to the seated occupant's ear is absorbed, and the resonator capable of exhibiting a high sound absorbing effect on the seated occupant is formed. Can do.

1 is a perspective view showing a schematic configuration of a vehicle seat of Example 1. FIG. It is the disassembled perspective view which showed the internal structure of the seat back. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a model figure of a resonator. FIG. 6 is a cross-sectional view illustrating a configuration of a main part of a vehicle seat of Example 2.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the sheet 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the seat 1 of the present embodiment is configured as a seat for the second row of a vehicle provided with a three-row seat. The seat 1 includes a seat back 2 that serves as a backrest for a seated occupant and a seat cushion 3 that serves as a seating portion. The seat back 2 has an electric reclining device 4 that functions as a rotating shaft device whose lower end portions on both the left and right sides can be prevented from rotating with respect to the rear end portions of the left and right sides of the seat cushion 3, respectively. Connected to each other. As a result, the seat back 2 tilts the backrest angle with respect to the seat cushion 3 in the front-rear direction in accordance with the driving of each reclining device 4 described above, or the backrest angle is fixed by restraining the driving of each reclining device 4. It is comprised so that it can do.

  Each of the reclining devices 4 described above is operated by driving of an electric motor M that is integrally attached to the seat back frame 2F. Along with this, the operation sound accompanying the driving of the electric motor M is easily transmitted to the seat back frame 2F, and the transmitted operation sound is easily transmitted to the seated passenger's ear through the upper frame 2Fa of the seat back frame 2F. ing. Further, the vibration sound transmitted to the seated occupant's ear through the seat back frame 2F described above is not limited to the operation sound of the electric motor M that operates each reclining device 4 described above. The operating sound of the electric motor for operating, the vibration sound accompanying driving | running | working of a vehicle, an engine sound, etc. are mentioned.

  Therefore, in the seat 1 of the present embodiment, in the upper region of the seat back 2 through which the above-described upper frame 2Fa passes in order to absorb various vibration sounds transmitted to the ears of the seated occupant through the above-described seat back frame 2F. In addition, a plurality of Helmholtz resonators Re capable of absorbing various vibration sounds transmitted through the upper frame 2Fa described above by a resonance effect are formed. As described above, a plurality of resonators Re capable of absorbing various vibration sounds transmitted through the upper frame 2Fa are set in the upper region of the seat back 2 close to the ears of the seated occupant. High sound absorption effect is exhibited.

  As shown in FIG. 2, each of the resonators Re includes a plurality of through-holes 2Fa1 formed in the upper frame 2Fa and a seat back pad 2P that is assembled in contact with the upper frame 2Fa. Each recess 2Pa is formed on the contact surface with the hole 2Fa1. Specifically, as shown in FIG. 3, each resonator Re has a seat in each through hole 2Fa1 formed in the upper frame 2Fa by assembling the seat back pad 2P to the upper frame 2Fa in a predetermined contact state. Each recess 2Pa formed in the back pad 2P is assembled in a state of close communication, and each through hole 2Fa1 functions as an “opening” and each recess 2Pa functions as a “resonance space”. It is supposed to be in a state.

  Hereinafter, detailed configurations of the seat back 2 and the resonators Re described above will be described. As shown in FIG. 1, a seat back 2 includes a steel seat back frame 2F that forms an internal skeleton, a urethane foam seat back pad 2P that forms a cushion structure, and a cloth seat back cover 2C that forms a skin. , Is composed of. As shown in FIG. 2, the seat back frame 2 </ b> F is configured by being assembled into a square frame shape that forms a skeleton shape along the outer periphery of the seat back 2. Specifically, the seat back frame 2F includes a side frame 2Fs made of a pair of left and right vertically long steel plates, and an upper frame 2Fa made of a circular steel pipe that is bridged and rigidly connected to the upper ends of the side frames 2Fs. And a bridging frame 2Fb made of a horizontally long steel plate that is bridged between the lower ends of both side frames 2Fs and integrally joined.

  Each side frame 2Fs is disposed in a state in which the plate surfaces face each other in the seat width direction, and each of the reclining devices 4 described above is connected to the lower region surface outside the seat. Yes. The upper frame 2Fa is formed in a shape bent in an inverted U shape, and the tip of each bent leg portion is bent into an arc shape formed at the upper end of each side frame 2Fs described above. Each surface is applied to the surface from the inside of the seat and is in a state of being firmly and integrally coupled by welding. In the intermediate portion extending in the seat width direction of the upper frame 2Fa, the rectangular cylindrical holder 2Fh serving as the headrest mounting portion described above with reference to FIG. They are assembled, welded, and fixed.

  As shown in FIG. 2, round leg-shaped through holes 2Fa1 are formed in the leg portions of the upper frame 2Fa and the intermediate portion extending in the seat width direction, respectively. Each through hole 2Fa1 is formed in each leg portion of the upper frame 2Fa, and three in the middle portion are arranged in the seat width direction. Each through-hole 2Fa1 is formed so as to penetrate on the surface portion facing the outer peripheral side (the seat outer side or the seat upper side) of the seat back 2 in each leg portion or intermediate portion. Specifically, each through-hole 2Fa1 is formed so as to penetrate each of the outer peripheral portions of the upper frame 2Fa on an obliquely inclined surface portion inclined from the outer peripheral direction (outer seat direction or upper seat direction) of the seat back 2 to the front side of the seat. (See FIG. 4).

  As shown in FIG. 2, the seat back pad 2P is assembled from the seat front side with respect to the seat back frame 2F assembled in the square frame shape described above, and the seat back frame 2F is separated from the seat front side and the outer peripheral side. Each is covered. Specifically, after the seat back pad 2P is assembled to the seat back frame 2F, the seat back cover 2C is placed so as to cover the entire surface, and the peripheral portion is pulled into the rear surface portion of the seat back frame 2F. By being fastened to the closed state, the seat back cover 2C is assembled in a state of being pressed in a state of being in close contact with the outer peripheral surfaces of the side frames 2Fs of the seat back frame 2F and the upper frame 2Fa. Yes.

  The seat back pad 2P is formed with a plurality of recesses 2Pa that are wound in a bag-like shape on the back surface of the seat back pad 2P that is applied to the outer peripheral surface of the upper frame 2Fa. These recesses 2Pa are formed by being pinched on the surface portions of the seat back pad 2P that come into contact with the through holes 2Fa1 formed in the above-described upper frame 2Fa. Specifically, as shown in FIG. 3, each of the recesses 2Pa is formed in a narrowed shape in which the opening 2Pa1 is fitted into each through hole 2Fa1 and opens into the pipe of the upper frame 2Fa. ing. Each recess 2Pa has a structure in which each opening 2Pa1 described above is configured to be fitted and opened inside each through-hole 2Fa1, so that it is substantially in communication with each through-hole 2Fa1. Has been. Moreover, each recessed part 2Pa is assembled | attached in the state correctly positioned with respect to each through-hole 2Fa1 by setting each opening part 2Pa1 mentioned above to the inside of each through-hole 2Fa1 being assembled | attached. It is configured.

  With the above assembly, Helmholtz resonators Re are formed in which each through hole 2Fa1 (opening 2Pa1) functions as an “opening” and each recess 2Pa functions as a “resonance space”. Each resonator Re is capable of effectively absorbing low-frequency (around 300 to 400 Hz) vibration sound that is difficult to be absorbed by the seat back pad 2P by the resonance effect. The seat back pad 2P is adapted to absorb vibration sound of around 1 kHz, which is a general high frequency region.

As shown in FIG. 5, the sound absorption frequency f0 of the vibration sound absorbed by each resonator Re is determined by the shape of each resonator Re determined by the shape of each through hole 2Fa1 (opening 2Pa1) and each recess 2Pa. Specifically, the sound absorption frequency f0 of the vibration sound absorbed by each resonator Re is given by the following equation calculated by the sound speed C, the volume V of the resonance space, the correction value L ′ of the port length, and the port opening area S. It is done.

In the above calculation formula, the port length correction value L ′ is given by the following formula obtained by adding 1.6 times the port opening radius r to the port length L.

Further, the port opening area S is given by the following expression obtained by multiplying the circumference ratio π by the square of the port opening radius r.

  In this embodiment, the shape of each resonator Re is as follows: port opening radius r = 2.5 mm, port length L = 10 mm, resonance space volume V = 25500 mm 3 (vertical inner dimension (10 mm) × horizontal inner dimension 85 (mm) X Height inside dimension (30 mm). When these dimensions are calculated by applying the above formulas, the sound absorption frequency f0 of each resonator Re is about 405 Hz. Therefore, by adjusting each of the above dimensions, the sound absorption frequency f0 (target frequency) desired to be absorbed by each resonator Re can be freely adjusted.

  In this way, the through hole 2Fa1 is formed in the seat back frame 2F, and the through hole 2Fa1 is defined as an “opening” and the respective recesses 2Pa are defined as “resonance spaces” by simply forming the recess 2Pa in the seat back pad 2P. A Helmholtz resonator Re can be formed. Specifically, each recess 2Pa formed in the seat back pad 2P is formed in a narrowed shape in which the opening 2Pa1 is fitted and opened in each through hole 2Fa1 formed in the seat back frame 2F. ing. Thereby, each recessed part 2Pa formed in the seat back pad 2P is assembled in a state of being positioned at an appropriate position with respect to each through hole 2Fa1 formed in the seat back frame 2F, and a sound absorbing function is provided in each resonator Re. Is exhibited well. In addition, a gap is less likely to be formed between each recess 2Pa of the seat back pad 2P and each through hole 2Fa1 of the seat back frame 2F, and a resonance space having a predetermined width can be formed.

  Further, each through hole 2Fa1 formed in the seat back frame 2F is specifically formed as a hole penetrating the inside and outside of the hollow pipe with respect to the upper frame 2Fa formed by the hollow pipe. Therefore, various vibration sounds transmitted through the upper frame 2Fa made of a hollow pipe can be satisfactorily absorbed by the resonator Re communicating with the hollow pipe. Further, since the vibration sound transmitted through the upper frame 2Fa of the seat back frame 2F close to the ears of the seated occupant is absorbed, a resonator Re that can exert a high sound absorbing effect on the seated occupant can be formed. .

  Then, the structure of the sheet | seat 1 (vehicle seat) of Example 2 is demonstrated using FIG. In addition, in a present Example, about the location which becomes substantially the same structure and an effect | action as the sheet | seat 1 (vehicle seat) shown in Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted and different. The location will be described in detail. In the present embodiment, each recess 2Pa formed in the seat back pad 2P is formed in a shape that is widened by being curled into a cylindrical shape from the back surface of the seat back pad 2P, and is formed in the upper frame 2Fa. It is configured to be pressed and positioned in close contact so as to communicate with each through hole 2Fa1. By setting each recess 2Pa formed in the seat back pad 2P to a slender shape as described above, each recess 2Pa can be formed relatively easily, and a slight amount is formed between each through-hole 2Fa1. Even if there is a misalignment, it is easy to assemble the recesses 2Pa in a state where they are communicated with the through holes 2Fa1.

  As mentioned above, although embodiment of this invention was described using two Examples, this invention can be implemented with various forms other than the said Example. For example, the resonator may be formed between a seat frame and a seat pad provided in contact with the seat frame, and between the frame other than the upper frame of the seat back frame and the seat back pad. It may be formed by. Further, the resonator may be formed between the seat cushion frame and the seat cushion pad, or between the frame and the pad in the headrest. Further, the seat frame in which the through hole is formed may have a plate shape instead of a hollow pipe shape.

  In addition, the narrowed shape (lid portion) of the opening 2Pa1 of each recess 2Pa formed in the seat back pad 2P shown in Example 1 is used as a back material such as a nonwoven fabric on the back surface of the seat back pad (sheet pad). You may make it form by laminating | stacking. In each of the above embodiments, the automobile seat 1 is illustrated as an example of the vehicle seat of the present invention. However, the vehicle seat of the present invention can be used for various vehicles such as vehicles other than automobiles, railways, airplanes, ships, and the like. It can be applied to a sheet for use.

1 seat (vehicle seat)
2 Seat back 2F Seat back frame 2Fs Side frame 2Fa Upper frame 2Fa1 Through hole 2Fh Holder 2Fb Bridge frame 2P Seat back pad 2Pa Recess 2Pa1 Opening 2C Seat back cover 3 Seat cushion 4 Reclining device Re Resonator f0 Sound absorption frequency C Sound velocity r Port opening Radius S Port opening area L Port length L 'Port length correction value V Resonance space volume M Electric motor

Claims (3)

A vehicle seat having a seat frame and a seat pad provided in contact with the seat frame,
A through-hole formed in the seat frame and a recess formed in the seat pad so as to communicate with the through-hole are formed on a part surface where the seat frame and the seat pad are in contact with each other. A Helmholtz resonator having a hole as an opening and the recess as a resonance space is formed ;
The vehicle is characterized in that the recess formed in the seat pad is formed in a narrowed shape in which an opening is fitted and opened in the through-hole formed in the seat frame . Sheet. The vehicle seat according to claim 1,
The vehicle seat according to claim 1, wherein the seat frame is formed of a hollow pipe, and the through hole is formed as a hole penetrating the inside and outside of the hollow pipe . The vehicle seat according to claim 1 or 2,
A vehicle seat, wherein the seat frame is configured as an upper frame that forms an upper skeleton of a seat back frame, and the through hole is formed in the upper frame .

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