JP6453414B2 - Seat cushion and vehicle seat - Google Patents

Description

  The present invention relates to a seat cushion and a vehicle seat, and more particularly to a seat cushion and a vehicle seat that have good vibration characteristics and excellent seating feeling.

  In general, in a vehicle seat, a seating portion (seat cushion) that supports an occupant's buttocks and thighs is formed by placing a cushion pad on a seating frame and covering a skin material (trim cover). . In such a seat cushion, various proposals have been made to improve the seating feeling of the occupant.

  Factors that affect the seating feeling include the followability (fit feeling) of the seat cushion to the occupant, vibration characteristics during vehicle travel, and the like. In particular, vibration characteristics tend to affect passengers sitting for a long time.

  Vehicles such as automobiles and trains vibrate on the floor surface when traveling. When the vibration at this time is transmitted to the vehicle seat, the seat cushion vibrates at a low frequency (about 3 to 4 Hz). As a result, the occupant's body seated on the seat cushion resonates, and the seating feeling may be impaired.

  On the other hand, as a technique for reducing the vibration in the low frequency region generated by the seat cushion when the vehicle travels and improving the seat cushion feeling, a technique for providing a seat suspension device has been proposed. There was a problem that it was complicated and increased in size.

  Furthermore, as a technique for relaxing resonance, a technique is known in which a pan frame is provided, and a plurality of S springs are installed at positions corresponding to the occupant's buttocks in the pan frame. With such a configuration, the seat cushion can easily follow the occupant's body due to the elastic deformation of the S spring and the cushion pad, and can obtain good cushioning properties. As a result, vibration transmitted from the vehicle body as the vehicle travels can be reduced.

  With respect to a seat cushion having a structure in which an S spring is installed on such a pan frame, Patent Document 1 discloses a seat cushion having an air chamber by forming a concave buttocks storage portion at a position corresponding to the occupant's buttocks. Is disclosed. In this seat cushion, the air chamber is a space formed between the pan frame and a cushion pad (described as “seat pad” in Patent Document 1) placed on the pan frame, An orifice communicating with the air chamber is formed on the wall surface of the pan frame.

  With the above-described configuration, the seat cushion disclosed in Patent Document 1 allows the air outflow from the air chamber to be satisfactorily performed with the compression deformation of the cushion pad, and the seat cushion itself can attenuate the vibration.

JP-A-9-117346

  The seat cushion disclosed in Patent Document 1 has a configuration in which the S spring is installed on the pan frame at a position corresponding to the occupant's buttocks, so that the cushion pad easily follows the occupant's body. Since the S spring is constructed above the air chamber, it is possible to attenuate the vibration without separately providing a suspension device or the like.

  However, in the seat cushion of Patent Document 1, a pan frame as a seating frame is provided over the entire surface of the seating frame, and it is necessary to arrange not only the thigh of the occupant but also a portion corresponding to the buttocks. Therefore, there is a disadvantage that the weight is large. Therefore, there has been a demand for a seat cushion that has a simple and lightweight configuration of the seat cushion itself, has high followability to the occupant, and further improves the seating feeling.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seat cushion and a vehicle seat that have a simple and lightweight structure and that have a good vibration characteristic, thereby providing a good seating feeling.

According to the seat cushion of the present invention, the subject is a seat cushion comprising: a seating frame; a cushion pad placed on the seating frame; and a skin material covering the seating frame and the cushion pad. The seating frame is installed on the pair of side frames extending in the front-rear direction of the seat, on the pair of side frames, on the front elastic member in contact with the cushion pad, and on the pair of side frames. A rear elastic member disposed at a predetermined distance from the front elastic member and abutting against the cushion pad; a connecting member provided at a rear portion of the pair of side frames; and a pair of the side frames. has been provided with a plate-shaped frame, and at least part of the previous SL front elastic member, in the sheet vertically The rear elastic member is disposed at a position higher than the connecting member and at the same height as the plate-like frame, and the front end and the rear end of the rear elastic member are disposed below the front end of the front elastic member. The pad contact surface of the front elastic member is disposed to be inclined rearward with respect to the horizontal plane, and the pad contact surface of the rear elastic member is inclined forward or parallel to the horizontal plane. The front elastic member and the rear elastic member are spaced apart from each other by a predetermined distance so that a sciatic tuber of the occupant is located in a space between the front elastic member and the rear elastic member. The rear end of the elastic member is solved by being disposed at a lower position in the seat vertical direction than the front end of the plate-like frame .

As described above, the seat cushion according to the present invention is installed on the pair of side frames and is in contact with the cushion pad. The seat cushion is installed on the pair of side frames and spaced apart from the front elastic member by a predetermined distance. And a rear elastic member that abuts against the cushion pad and a plate-like frame that is installed on the pair of side frames. The frame area can be reduced. As a result, the seat frame can be reduced in weight.
By laying the elastic member in the left-right direction, the occupant's buttocks are supported by the elastic member. As a result, the resonance magnification is further reduced, and the resonance frequency can be increased. Therefore, the vibration characteristics with respect to the vibration from the vehicle are further improved, and the occupant is less likely to feel fatigue due to resonance. As a result, a seat cushion having a good seating feeling can be obtained.
Moreover, a cushion pad is supported by the elastic member by providing an elastic member. As a result, when the occupant is seated, the cushion pad easily follows the occupant's buttocks by the elastic member, so that the seating feeling can be improved.
Further, since a lightweight elastic member is used without using a special device in order to improve the followability of the cushion pad, the seat cushion of the present invention is suitable without increasing its weight.
In addition, since the front elastic member and the rear elastic member are arranged so that the sciatic tuber of the occupant is located in the space between the front elastic member and the rear elastic member in the front-rear direction, the pressure just below the sciatic tuber (sciatic pressure) Better seating feeling can be given.

In the above configuration, a locking portion for locking the front elastic member is provided on an inner side surface of each of the pair of side frames, and at least a part of the locking portion is an upper end of the coupling member. It is preferable that it is disposed at a higher position than that of the plate-shaped frame.
In addition, a first locking portion for locking the front elastic member and a second locking portion for locking the rear elastic member are provided on the inner side surfaces of the pair of side frames. It is preferable that the first locking portion and the second locking portion are provided at a position higher than the upper end of the connecting member.
Furthermore, it is preferable that at least a part of the first locking portion is disposed at a position higher than the second locking portion.

The connecting member is a long member having a substantially cylindrical shape, and the cushion pad is located between the rear elastic member and the connecting member, and the rear end portion of the rear elastic member and the center of the connecting member. It is preferable that it extends downward to a position intersecting with an imaginary line connecting the axes.

The front end and the rear end of the rear elastic member are preferably disposed below the front end of the plate-like frame.
Each of the pair of side frames is provided with a locking portion for locking the front elastic member or the rear elastic member, and the locking portion is formed on the bulging surface and the bulging surface. It is preferable that an end portion of the front elastic member or the rear elastic member is inserted into the engagement hole.
Further, it is preferable that the end portion of the front elastic member or the rear elastic member is inserted into the engagement hole from the rear to the front in the seat front-rear direction.
The bulge surface is preferably formed on an inner surface of the side frame.

In addition, according to the vehicle seat of the present invention, the above problem is solved by including any one of the above seat cushions and a seat back.
As described above, the vehicle seat according to the present invention includes the seat cushion having a good seating feeling with a light and simple configuration as described above. Therefore, it is possible to provide a vehicle seat that is lightweight as a whole and has a good seating feeling.

According to the present invention, the vibration characteristics can be improved with an extremely lighter and simpler structure than the seat cushion in which the pan frame is disposed over the entire surface of the seating frame. Although the seat cushion can be reduced in weight simply by reducing the pan frame, the vibration characteristics may be reduced. Since the body is less likely to resonate, a seat cushion that provides a comfortable seating feeling can be provided.
In addition to the plate-like member, the vibration characteristics can be further improved by further providing an elastic member. In addition, by supporting the cushion pad with the elastic member, the cushion pad can more easily follow the occupant, so that the seating feeling can be further improved. And since the followable | trackability of a cushion pad is improved without using a special apparatus, the weight of a seat cushion does not increase.
Moreover, it can be set as the seat cushion which reduces a sciatic pressure and gives a better seating feeling.
In addition, according to the present invention, since the seat cushion is provided, a vehicle seat having a lightweight and simple configuration, excellent vibration characteristics, and good seating feeling can be provided.

1 is a schematic perspective view of a vehicle seat according to an embodiment of the present invention. It is a schematic perspective view of the seating frame concerning the embodiment of the present invention. It is explanatory drawing of the state in which the passenger | crew sat down on the seat cushion which concerns on embodiment of this invention. It is explanatory drawing which shows the structure of the elastic member which concerns on embodiment of this invention. It is explanatory drawing which shows the structure of the plate-shaped frame which concerns on embodiment of this invention. It is a graph which shows the seating shape in the seat cushion which concerns on the Example and comparative example of this invention. It is a graph which shows the magnitude | size of the sciatic pressure in the seat cushion which concerns on the Example and comparative example of this invention. It is a graph which shows the resonance magnification of the seat cushion which concerns on the Example and comparative example of this invention. It is a graph which shows the load characteristic of the seat cushion which concerns on the Example and comparative example of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and various modifications can be made in accordance with the spirit of the present invention. Further, in this specification, the vehicle refers to a vehicle for traveling on which a seat can be mounted, such as a vehicle for traveling on the ground having wheels such as an automobile or a railroad, an aircraft or a ship moving on the ground, and the like. Further, the normal seating load includes a seating impact that occurs when sitting, a load during acceleration caused by sudden start of the vehicle, and the like.
Furthermore, regarding the term indicating the direction in this specification, each direction is defined as shown in FIG. That is, the left-right direction indicates the width direction of the vehicle seat, and the left side when viewed from the seated occupant is the left direction, and the right side when viewed from the seated occupant is the right direction. The forward direction refers to the front as viewed from the seated occupant, and the rear direction refers to the rear as viewed from the seated occupant.

  Further, in this specification, “hip point” and “H point” connect the torso and thigh of a three-dimensional mannequin according to US SAE standard J-826 (SAE-3DM type manufactured by Ito Seiki Co., Ltd.). This is the center point of rotation. Furthermore, the “sciatic nodule” is a portion located at the lowermost part of the pelvis of the occupant.

  1 to 5 relate to an embodiment of the present invention, FIG. 1 is a schematic perspective view of a vehicle seat, FIG. 2 is a schematic perspective view of a seating frame, and FIG. 3 is a state in which an occupant is seated on a seat cushion. FIG. 4 is an explanatory view showing the configuration of the elastic member, FIG. 5 is an explanatory view showing the configuration of the plate-like frame, and FIGS. 6 to 9 are related to the seat cushion according to the embodiment and the comparative example of the present invention. FIG. 6 is a graph showing the sitting shape, FIG. 7 is a graph showing the magnitude of the sciatic pressure, FIG. 8 is a graph showing the resonance magnification, and FIG. 9 is a graph showing the load characteristics.

With reference to FIG. 1 thru | or FIG. 5, the vehicle seat S which concerns on embodiment is demonstrated.
As shown in FIG. 1, the vehicle seat S includes a seat back S1 (back), a seat cushion S2, and a headrest S3. The seat back S1 and the seat cushion S2 mount cushion pads 1a and 2a on the seat frame. It is covered with the skin material 1b, 2b. The headrest S3 is formed by arranging a pad material 3a on a core material (not shown) of the head and covering it with a skin material 3b. Reference numeral 20 denotes a headrest pillar that supports the headrest S3.

The seat frame of the vehicle seat S includes a seat back frame (not shown) constituting the seat back S1 and a seating frame F constituting the seat cushion S2.
The seat back S1 has the cushion pad 1a mounted on the seat back frame as described above and is covered with the skin material 1b from above the cushion pad 1a, and supports the back of the occupant C from behind. .

The seat cushion S2 is configured to place the cushion pad 2a on the seating frame F as described above, and is covered with the skin material 2b from above the cushion pad 2a, and support the occupant C from below. . The seating frame F is supported by a leg (not shown). An inner rail is attached to the leg, and the leg is assembled in a slide type that can be adjusted in the front-rear position with the outer rail installed on the vehicle floor. It has been.
Further, the rear end portion of the seating frame F is connected to a seat back frame (not shown) via a reclining mechanism (not shown).

In the present embodiment, as shown in FIG. 2, the seating frame F is a substantially rectangular frame, and the side frames 11, 11 that are separated in the left-right direction and the front side of the side frames 11, 11 ( Pan frame 12 as a plate-like frame laid on the front end), member pipe 13 as a connecting member disposed on the rear side of the side frames 11, 11, and a front elastic member laid on the side frames 11, 11 And a rear spring 15 as a rear elastic member.
The pan frame 12 and the member pipe 13 are both installed on the side frames 11 and 11 and connect the side frames 11 and 11.

  The two (a pair of) side frames 11 are disposed so as to be separated from each other in the left-right direction and extend in the front-rear direction in order to configure the width of the seating frame F. A member pipe 13 is attached to the rear side of the pair of side frames 11 and 11, and the pair of side frames 11 and 11 are connected by the member pipe 13.

  The pan frame 12 is fixedly joined to the front side of the pair of side frames 11, 11, and the pair of side frames 11, 11 are also connected by the pan frame 12. More specifically, the left and right ends of the pan frame 12 are fixed to flanges 11b and 11b provided on the side frames 11 and 11, respectively.

  The pan frame 12 is a metal frame whose upper surface is formed in a substantially rectangular shape so as to mainly support the thigh of the occupant C. As shown in FIG. 2, a convex portion 12 d may be provided on the upper surface of the pan frame 12 in order to suppress a submarine phenomenon at the time of rear collision and a positional shift at the time of sitting.

  As shown in FIG. 3, the pan frame 12 includes a front bent portion 12a whose front end portion is bent downward, and a rear bent portion 12b whose rear end portion is bent downward. . Further, a support surface 12c is provided between the front bent portion 12a and the rear bent portion 12b. The support surface 12c has a substantially flat upper surface and is inclined slightly downward toward the rear. In addition, the edge part of the left-right direction of this support surface 12c is fixed to the flanges 11b and 11b of the side frames 11 and 11, respectively (refer FIG. 2).

  The end portion of the skin material 2 b is locked to the end portion (lower end portion) of the front bent portion 12 a of the pan frame 12. In addition, a well-known method, such as a trim cord, is used for the locking means between the skin material 2b and the front bent portion 12a.

  A front spring 14 and a rear spring 15 are disposed behind the rear bent portion 12 b of the pan frame 12. The front spring 14 and the rear spring 15 are horizontally mounted between the side frames 11 and 11, and both end portions of the front spring 14 and the rear spring 15 are engaged with locking portions 11 c and 11 c provided on the side frames 11 and 11. Each is locked. The locking portion 11c is provided in the side frame 11 and is formed with two holes spaced apart in the front-rear direction so that a portion sandwiched between the holes bulges toward the inside of the side frame 11. It is configured. Then, the end of the front spring 14 or the rear spring 15 is inserted from one hole, and a part of the spring is placed along the bulged portion, and then the end is inserted through the other hole.

  In this way, the end portions of the front spring 14 and the rear spring 15 are supported by the locking portion 11c having a bulging surface that abuts along the front-rear direction.

  The front spring 14 and the rear spring 15 are separated from each other by a predetermined distance (about 50 to 70 mm from the rear end of the front spring 14 to the front end of the rear spring 15) when the seating frame F is viewed from directly above (that is, in plan view). The extending directions are substantially parallel to each other.

  Further, a position corresponding to the sciatic nodule P of the occupant C is supported between the front spring 14 and the rear spring 15 (space separated by a predetermined distance). That is, the anterior spring 14 and the posterior spring 15 are disposed so as to be separated from each other to the extent that they are not disposed at least below the position of the sciatic nodule P.

  The front spring 14 and the rear spring 15 are linear members formed in a wave shape (zigzag shape) or the like, and mainly support the occupant C's buttocks. End portions of the front spring 14 and the rear spring 15 are pivotally supported by the side frames 11, 11, respectively, and the cushion pad 2 a is placed above the front spring 14 and the rear spring 15.

  The planes including the corrugated shapes of the front spring 14 and the rear spring 15 (planes constituted by the corrugated shapes) are respectively disposed slightly inclined with respect to the horizontal direction. Hereinafter, the inclination angle will be described in detail.

(Inclination angle of the front spring 14 and the rear spring 15)
FIG. 4 shows a partially enlarged view of the sectional view of the seat cushion S2 in a state of being cut in the front-rear direction and an explanation thereof. In FIG. 4, the left side indicates the front side of the seat cushion S2, and the right side indicates the rear side of the seat cushion S2.
As shown in FIG. 4, the front spring 14 and the rear spring 15 are arranged such that the surfaces formed by the corrugated shapes are inclined with respect to the horizontal direction (horizontal plane X). The front spring 14 is disposed with its rear side inclined downward (backwardly inclined), and the rear spring 15 is disposed with its front side inclined downward (forwardly inclined), or It is arranged horizontally.

  In other words, the front spring 14 is disposed so that the surface (pad contact surface 14a with the cushion pad 2a) that contacts the cushion pad 2a and supports the pad tilts backward with respect to the horizontal plane X. The rear spring 15 abuts against the cushion pad 2a and supports the pad (the pad abutment surface 15a with the cushion pad 2a) tilts forward with respect to the horizontal plane X or is parallel to the horizontal plane X. It is arranged.

At this time, as shown in FIG. 4, the smaller one of the angles formed by the corrugated shape of the front spring 14 (the pad contact surface 14 a with the cushion pad 2 a) with respect to the horizontal plane X ( the size of the acute angle) and theta _1, surface formed by the waveform shape of the rear spring 15 (the pad contact surface 15a of the cushion pad 2a) is, among the angle formed with respect to the horizontal plane X, the smaller the angle of ( When the magnitude of the acute angle is θ ₂ , the angles θ ₁ and θ ₂ are set to different angles.

The angle theta ₁ and theta ₂ is generally occupant C buttocks shape physique (more specifically, the angle is inclined relative to the seat surface theta _{1 'and} θ _2': θ _{1 'is} of the occupant C The angle formed between the horizontal plane X and the line passing through the sciatic nodule P and the buttocks of the occupant C located 80 mm forward from the sciatic nodule P, and θ ₂ ′ is the sciatic nodule P of the occupant C and the posterior from the sciatic nodule Is an angle formed by a line passing through the buttocks of the occupant C at a position 80 mm away and the horizontal plane X). In the present invention, θ ₁ > θ ₂ is satisfied. More specifically, when I = θ ₂ / θ ₁ , 0 ≦ I ≦ 0.18 (more specifically, I = 0 when the pad contact surface 15a is horizontal, otherwise In this case, 0 <I ≦ 0.18) is preferable.

  By providing the front spring 14 and the rear spring 15 having such a configuration, the seat cushion S2 can easily follow the shape of the buttock of the occupant C, so that the occupant C can obtain a good fit. Further, since the front spring 14 and the rear spring 15 are separated from each other by a predetermined distance, the sciatic tuberculosis P of the occupant C can be supported between the front spring 14 and the rear spring 15 (part separated by a predetermined distance). As a result, the seat cushion pressure can be reduced and the seat cushion S2 having a better seating feeling can be obtained.

More specifically, θ ₁ = 17 to 21 ° and θ ₂ = 0 to 3 ° are preferable. Thus, the value of θ ₁ is set so that the height of the front end of the pan frame 12 disposed in front and the front spring 14 does not differ greatly in consideration of the deflection of the cushion pad 2a. . When the value of θ ₁ is made larger or smaller than the above value, the passenger C feels a step at the boundary portion between the pan frame 12 and the front spring 14 and the seating feeling decreases, but the value of θ ₁ is reduced to the above value. Thus, the seat cushion S2 having a good seating feeling can be obtained. The value of θ ₁ is optimally set to 19 ° in consideration of the bending of the front spring 14 itself.

Furthermore, if the value of θ ₂ is larger than the above value, the cushion pad 2a must be thinned, so that the buttocks of the occupant C are likely to come into contact with the rear spring 15 and the seating feeling is lowered, but θ ₂ By setting the above value to the above value, the thickness of the cushion pad 2a can be secured, and the occupant C does not feel the bottom when sitting, which is preferable. The value of θ ₂ is optimally set to 0 ° in order to secure the thickness of the cushion pad 2a.

  Furthermore, since the front spring 14 and the rear spring 15 having the above-described configuration are provided, the deflection of the cushion pad 2a can be absorbed by the extension of the spring, so that the seating feeling is further improved.

In addition, although the structure comprised by each S spring was demonstrated as a front elastic member and a back elastic member, for example, elastic members, such as rubber | gum formed in the strip | belt shape which has predetermined width, are used as a front elastic member and a back elastic member. May be. When the belt-like elastic member is used, the upper surface thereof is disposed to be inclined with respect to the horizontal direction. That is, among the angles formed by the upper surface of the elastic member disposed in the front and the horizontal plane X, the smaller angle (acute angle) is θ ₁ , and the angle formed by the upper surface of the elastic member disposed in the rear and the horizontal plane X. Of these, the smaller angle (acute angle) is defined as θ ₂ , and the elastic member is disposed so that θ ₁ and θ ₂ satisfy the above values.

(Effects of the front spring 14 and the rear spring 15)
As described above, since the front spring 14 is inclined backward with respect to the horizontal plane X and the rear spring 15 is inclined forward (or horizontally) with respect to the horizontal plane X, the seat of the present invention. The cushion S2 has a high followability with respect to the occupant C and exhibits a good fit.

  In addition, by configuring the front spring 14 and the rear spring 15 as described above, the seat cushion S2 of the present invention can have good cushioning properties and can attenuate vibration without separately including other buffer members.

  Further, in the seat cushion S2 of the present invention, since the front spring 14 and the rear spring 15 are arranged at a predetermined distance from each other, the pressure just below the sciatic tubercle (sciatic pressure) having the highest seating pressure when sitting is provided. Can be reduced.

  Therefore, as described above, the seat cushion S2 of the present invention exhibits a good fit, can attenuate vibrations, and can further reduce the sciatic pressure. A very good seating feeling can be given. Further, since the seat cushion S2 of the present invention has a simple and lightweight configuration without increasing the number of parts, work efficiency is improved when the seat cushion S2 (vehicle seat S) is assembled to a vehicle. Is preferable.

(Structure of pan frame 12)
In FIG. 5, sectional drawing of the state which cut | disconnected seat cushion S2 in the front-back direction and its description are shown. In FIG. 5, the left side indicates the front side of the seat cushion S2, and the right side indicates the rear side of the seat cushion S2.
As shown in FIG. 5, the rear end portion 12e of the support surface 12c of the pan frame 12 (that is, the boundary portion between the support surface 12c and the rear bent portion 12b) is based on the position of the hip point H of the three-dimensional mannequin. The position is determined.

  As shown in FIG. 5, the rear end 12e of the pan frame 12 has a height (vertical direction distance) from the rear end 12e to the hip point H in the longitudinal direction between the rear end 12e and the hip point H. When the distance (however, the hip point H is located behind the rear end portion 12e) is β, the ratio of α to β, that is, α / β satisfies the relationship 0.73 ≦ α / β ≦ 1.09. It is preferable that it is provided.

  When the rear end portion 12e of the pan frame 12 is provided at the position as described above, the vibration characteristics when the vehicle is traveling are improved, and a foreign object feeling at the time of sitting is not felt, and a good seating feeling can be obtained. In this case, “vibration characteristics are improved” means that the resonance magnification is reduced and the resonance frequency is increased. The vibration characteristics will be described in detail below.

More specifically, the values of α and β are preferably about α = 85 to 105 mm and β = 96 to 116 mm. When the pan frame 12 is attached to the side frames 11 and 11 so that α and β are in this range, the vibration characteristics are improved.
When α exceeds 105 mm or when β exceeds 116 mm, the vibration characteristics cannot be improved, and when α is smaller than 85 mm or when β is smaller than 96 mm, Since it becomes easy to feel a feeling of bottoming or a foreign object in the buttocks, the seating feeling is lowered.

  As described above, a configuration in which a pan frame that is originally heavy is spanned over the entire surface by setting the position of the rear end 12e of the pan frame 12 within the above range with respect to the hip point H of the three-dimensional mannequin. Compared with, the pan frame area can be reduced. As a result, not only the weight of the seating frame F can be reduced, but also the vibration characteristics during traveling of the vehicle and the seating feeling felt by the passenger C can be improved.

  Furthermore, the seat cushion S2 of the present invention has improved vibration characteristics by installing the rear end 12e of the pan frame 12 within the above range and further installing the front spring 14 and the rear spring 15 as described above. In addition, since the cushion pad 2a can easily follow the body (buttock) of the occupant C and the sciatic pressure is further reduced, a very good seating feeling can be given to the occupant C. Moreover, since a complicated apparatus is not provided as a structure which improves the followable | trackability of the cushion pad 2a, a weight does not increase.

(Examples and Comparative Examples)
Hereinafter, examples and comparative examples of the present invention will be described with reference to FIGS.
6 to 9, “Example” is the seat cushion S2 according to the embodiment of the present invention, in which θ ₁ is 19 ° and θ ₂ is 0 °. Further, α = 95 mm and β = 106 mm.
In the “comparative example”, four S springs are installed in the front-rear direction instead of the front spring 14 and the rear spring 15 of the present invention. In the “comparative example”, the pan frame is smaller in the front-rear direction than the embodiment (that is, β is larger than 116 mm), and the height from the rear end of the pan frame to the hip point H is large ( That is, α is larger than 105 mm). Specifically, α = 115 mm and β = 153 mm.

  FIG. 6 is a graph showing the seating shape (displacement in the height direction) of the seat cushion S2 when the occupant C (subject) is seated. The horizontal axis is the front-rear direction of the seat cushion S2, and the vertical axis is the amount of displacement in the height direction of the upper surface (the surface on which the occupant abuts) of the seat cushion S2. ing. 6 indicates the position of the sciatic nodule P of the occupant C.

  In this measurement, a stainless steel tape (thickness = 0.4 mm, width = 40 mm) was stretched across the seat cushion S2 in the front-rear direction, and a strain gauge type load measuring instrument (Minebea Corp.) was seated on the seat cushion S2. The seating shape comparison was performed by measuring using a company. The test subject at this time was an occupant closest to the average of 40 body shapes (buttock shape).

  As a result, in the position of the sciatic nodule P, the displacement amount is the same in the example and the comparative example, while the displacement of the embodiment of the present invention is smaller at the front end and the rear end of the seat cushion S2, and the passenger C It was shown to support. Therefore, it was confirmed that the seat cushion S2 of the present invention has high followability to the occupant C, that is, fit.

  Therefore, the front spring 14 and the rear spring 15 are installed in the left-right direction, and the front spring 14 is tilted rearwardly, rather than the seat cushion having a configuration in which the elastic member supporting the cushion pad 2a is installed in the front-rear direction. It was shown that the cushion pad 2a can easily follow the occupant C by tilting forward.

Angle theta ₁ to 19 ° to the pad contact surface 15a of the pad contact surface 14a and the rear spring 15 of the front spring 14 makes with the horizontal plane X, by the theta ₂ and 0 °, before and after the ischial tuberosity P, occupant It was shown that it is possible to support the buttock well.

  FIG. 7 is a graph showing the sciatic pressure in the seat cushion S2 when the occupant C is seated. In this measurement, a sensor is mounted on the cushion pad 2a (skin material 2b) (more specifically, the portion corresponding to the sciatic tuberculosis P), and the subject is seated using a clothing pressure gauge (manufactured by AIM Techno Co., Ltd.). This was done by measuring the pressure of

As a result, it was shown that the sciatic pressure of the example was significantly smaller than the sciatic pressure of the comparative example. Therefore, it was confirmed that the sciatic pressure that greatly affects the seating feeling can be reduced by installing the front spring 14 and the rear spring 15 in the left-right direction and disposing them apart from each other.
On the other hand, in the comparative example in which the elastic member is installed in the front-rear direction, it is difficult to reduce the sciatic pressure because the elastic member cannot be disposed avoiding the sciatic tuberosity. Therefore, in the seat cushion S2 of the present invention, the front spring 14 and the rear spring 15 are arranged with a predetermined distance apart, and the sciatic nodule P can be positioned in the separated portion, so that the seating feeling is improved.

FIG. 8 is a graph showing the results of the forced vibration test (vibration characteristic test) of the seat cushion S2. The horizontal axis represents frequency, and the vertical axis represents resonance magnification (transmittance).
This measurement was performed based on JASO B407-87 “6.4 Vibration Test”.

As a result, in the seat cushion S2 of the embodiment, the resonance magnification is decreased, the frequency is shifted to the high frequency side, and the resonance point is greatly shifted from the resonance range of the body of the occupant C. confirmed.
On the other hand, in the comparative example in which the pan frame is formed to be relatively small in the front-rear direction (that is, the rear end of the pan frame is provided at a position far from the hip point H), the resonance magnification is high, and the resonance point is further increased. It is difficult to shift from the resonance range of the occupant C body.

  Therefore, the seat cushion S2 of the present invention has improved vibration characteristics by setting the position of the rear end portion 12e of the pan frame 12 to the above-described configuration. That is, the seat cushion S2 of the present invention can shift the resonance point of the seat from the resonance region of the body of the occupant C, and can further reduce the resonance magnification. As a result, the seat cushion S2 of the present invention has a high effect of relieving resonance during vehicle travel and can have a good seating feeling.

  Further, in the seat cushion of the comparative example, the elastic members provided in the seating frame are installed in the left-right direction, and the number thereof is four, but the seat cushion S2 of the present invention reduces the number of elastic members. Since the installation direction is the front-rear direction, the vibration characteristics are expected to be further improved.

FIG. 9 is a graph showing the results of the load deflection test (load characteristic test) of the seat cushion S2. The horizontal axis indicates the amount of displacement of the seat cushion S2, and the vertical axis indicates the load applied to the seat cushion S2.
This measurement was performed based on the section “6.1 Load test” of JASO B407-87.

  As a result, the seat cushion S2 of the example maintains the same degree of hardness as the seat cushion of the comparative example in the load range of the static seating (normal seating) region, but compared in the load range of the vibration seating region. It was shown to be stiffer than the example seat cushion.

  Therefore, the seat cushion S2 of the present invention has high hardness against a high load when the position of the rear end portion 12e of the pan frame 12 is configured as described above. As a result, the seat cushion S2 of the present invention has improved vibration characteristics and a good seating feeling.

(Other embodiments)
In each of the above embodiments, the seat frame F of the front seat of the automobile has been described as a specific example. However, the present invention is not limited to this, and the same configuration can be applied to the seat frame of the rear seat. is there.

C Crew (3D mannequin)
H Hip point (H point)
P Sciatic tuberosity S Vehicle seat S1 Seat back S2 Seat cushion S3 Headrest F Seating frame X Horizontal surface 1a, 2a, 3a Cushion pad (pad material)
1b, 2b, 3b Skin material 11 Side frame 11b Flange 11c Locking portion 12 Pan frame (plate frame)
12a Front bent part 12b Back bent part 12c Support surface 12d Convex part 12e Rear end part 13 Member pipe (connecting member, pipe frame)
14 Front spring (front elastic member)
14a Pad contact surface 15 Rear spring (rear elastic member)
15a Pad contact surface 20 Headrest pillar

Claims (10)

A seat cushion comprising: a seating frame; a cushion pad placed on the seating frame; and a skin material covering the seating frame and the cushion pad;
The seating frame is
A pair of side frames extending in the longitudinal direction of the seat;
A front elastic member installed on the pair of side frames and in contact with the cushion pad;
A rear elastic member installed on the pair of side frames, disposed at a predetermined distance from the front elastic member, and in contact with the cushion pad;
A connecting member erected on the rear part of the pair of side frames;
A plate-like frame constructed between the pair of side frames;
Equipped with a,
At least part of the previous SL front elastic member, in the sheet vertically, while being disposed at a higher position than the connecting member, is located at the same height as the plate frame,
The front end and the rear end of the rear elastic member are disposed below the front end of the front elastic member ,
The pad contact surface of the front elastic member is disposed to be inclined rearward with respect to a horizontal plane,
The pad contact surface of the rear elastic member is disposed so as to be inclined forward or parallel to the horizontal plane,
The front elastic member and the rear elastic member are arranged at a predetermined distance so that an occupant's sciatic tubercle is located in a space between the front elastic member and the rear elastic member,
The seat cushion according to claim 1, wherein a rear end of the front elastic member is disposed at a lower position in a seat vertical direction than a front end of the plate-like frame . A locking portion for locking the front elastic member is provided on the inner side surface of each of the pair of side frames,
2. The seat according to claim 1, wherein at least a part of the locking portion is disposed at a position higher than an upper end of the connecting member and is positioned at the same height as the plate-like frame. cushion. A first locking portion for locking the front elastic member and a second locking portion for locking the rear elastic member are provided on the inner side surfaces of the pair of side frames. ,
The seat cushion according to claim 1, wherein the first locking portion and the second locking portion are disposed at a position higher than an upper end of the connecting member.   The seat cushion according to claim 3, wherein at least a part of the first locking portion is disposed at a position higher than the second locking portion. The connecting member is a long member having a substantially cylindrical shape,
The cushion pad extends downward to a position intersecting a virtual line connecting the rear end portion of the rear elastic member and the central axis of the connecting member between the rear elastic member and the connecting member. The seat cushion according to any one of claims 1 to 4, wherein the seat cushion is provided. The seat cushion according to any one of claims 1 to 5 , wherein the front end and the rear end of the rear elastic member are disposed below the front end of the plate-like frame. Each of the pair of side frames is provided with a locking portion for locking the front elastic member or the rear elastic member,
The locking portion has a bulging surface and an engagement hole formed in the bulging surface,
The seat cushion according to claim 1, wherein an end portion of the front elastic member or the rear elastic member is inserted into the engagement hole.   The seat cushion according to claim 7, wherein the end portion of the front elastic member or the rear elastic member is inserted into the engagement hole from the rear to the front in the seat front-rear direction.   The seat cushion according to claim 7 or 8, wherein the bulging surface is formed on an inner surface of the side frame.   A vehicle seat comprising the seat cushion according to any one of claims 1 to 9 and a seat back.

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