JP2017114425A - Seat frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable lengths of springs to be adjusted so that optimum springs can be installed in a seat frame and the springs can be commonly used, by changing a length of an upper surface part of a bracket to be mounted on a side frame part, even if an interval of the side frame part differs depending on a width and a set type of a vehicle to which is applied the structure.SOLUTION: In the seat frame structure in which springs 52 and 53 are in stalled in a side frame part 51 positioned at a side part of a seat frame 5, a mounting surface 51a of a bracket 6 is formed in the side frame part 51. The bracket 6 has an upper surface part 61 extending from an upper surface of the side frame part 51 to inside of the seat frame 5, and a vertical surface part 63 extending downward from an inner end part of the upper surface part 61 through a bent part 62, where in the vertical surface part 63, spring mounting parts 64 and 65 on which end parts 52a and 53a of the springs 52 and 53 are to be mounted are provided.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a vehicle seat frame structure.

It is known that the seating sensation of a vehicle seat such as an automobile greatly affects the impression of the occupant on the vehicle. For this reason, a spring that supports the seat cushion pad that constitutes the seat cushion is often used to obtain an optimum reaction force. Such springs have characteristics that individual strengths are generated and change depending on the material, length, thickness (diameter), number of turns (number of folds), and the like of the spring. In addition, since the difference in strength in the spring characteristics appears as a reaction force of the spring, it may lead to a difference in the feeling received when the occupant sits on the seat cushion.
On the other hand, the length of the spring in the vehicle width direction must be changed depending on the width of the vehicle to be applied and the difference in seat type, and it cannot be used because there is a spring that can obtain the optimum reaction force. There are many.

Further, most of the springs are attached in a state of being spanned between a pair of left and right side frame portions located on the side portion of the seat frame as a seating portion. On the other hand, the seat frame is formed using a high-strength member. For this reason, if the spring is firmly fixed by the high-strength side frame portion, the reaction force of the spring becomes difficult to exert and the possibility of halving. The uncomfortable feeling felt when the occupant sits on the seat cushion is directly linked to the impression of the vehicle, so when designing the seat cushion, it is necessary to repeat the test ride test and select and set the optimal spring. However, it has the problem of requiring a lot of labor.
Therefore, some conventional vehicle seats have a structure in which the ends of the springs are attached to the flange surfaces formed on the left and right side frames in order to solve the above problem (for example, Patent Document 1). .

Japanese Patent Application Laid-Open No. 2014-1000093

However, with the conventional spring mounting structure on the side frame described above, the spring mounting strength can be increased, but the spring is attached with the end of the spring in contact with the flange surface of the high-strength side frame. As a result, the spring loses the reaction force at the portion of the spring attached to the flange surface, and there is a problem that the occupant feels uncomfortable when the seat cushion is seated.
In addition, when the spacing between the left and right side frames differs depending on the applicable seat, etc., the optimum spring setting must be considered each time, and the freedom of spring placement is limited and the seat There has been a problem in that the effort in designing the cushion cannot be reduced.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a bracket to be attached to the side frame portion even if the distance between the side frame portions varies depending on the width of the vehicle to be applied, the seat type, and the like. It is an object of the present invention to provide a seat frame structure in which the length of the spring can be adjusted by changing the width of the upper surface portion, the optimum spring can be set in the seat frame, and the spring can be shared.

  In order to solve the above-described problems of the prior art, the present invention provides a seat frame structure in which a spring is attached to a side frame portion located on a side portion of the seat frame, and a mounting surface of a bracket is formed on the side frame portion. The bracket has an upper surface portion extending from the upper surface of the side frame portion to the inside of the seat frame, and a vertical surface portion extending downward from the inner end portion of the upper surface portion via a bent portion. The vertical surface portion is provided with a spring mounting portion for attaching an end portion of the spring.

  In the aspect of the invention, the bracket extends along the longitudinal direction of the side frame portion, and the seat cushion pad supported by the seat frame has a groove portion extending along the seat width direction. The seat front side end portion of the bracket is positioned on the seat front side of the groove portion.

Furthermore, in one aspect of the present invention, a bead-shaped portion is provided on the upper surface portion of the bracket.
And in one mode of the present invention, the bead shape portion is located at least on the front side or the rear side of the spring mounting portion in the seat longitudinal direction.
Moreover, in 1 aspect of this invention, it has a seat cushion which has a seat back and the said seat frame structure as described in any one of Claim 1 to 4.

  As described above, the seat frame structure according to the present invention is a seat frame structure in which a spring is attached to a side frame portion located on a side portion of the seat frame, wherein the side frame portion is provided with a mounting surface of a bracket, The bracket includes an upper surface portion that extends from the upper surface of the side frame portion to the inside of the seat frame, and a vertical surface portion that extends downward from the inner end portion of the upper surface portion via a bent portion. Since the surface portion is provided with a spring mounting portion for attaching the end portion of the spring, unlike the case where the load loaded on the spring is received only by the side frame portion, the bracket can also receive the load loaded on the spring. it can. Moreover, since the load applied to the spring is finally received by the side frame portion while allowing the bending of the bracket and the spring mounting portion to bend due to the load applied to the spring, the spring is firmly held. be able to.

In addition, the seat frame structure of the present invention is configured to be able to support the thigh of the occupant by the upper surface of the bracket that can be bent when the occupant is seated or when getting on / off, The seating feeling can be improved and the passenger can get on and off smoothly.
Furthermore, the seat frame structure of the present invention can change the width of the upper surface of the bracket attached to the side frame portion even if the distance between the side frame portions varies depending on the width of the vehicle to be applied, the seat type, etc. Since the height can be adjusted, it is possible to reduce the frequency of reviewing the spring setting according to differences in the seat width, etc., and it is possible to easily set a spring that exhibits optimal cushion performance to the seat frame and to make the spring common It is possible to reduce the part cost due to the above.

  In the aspect of the invention, the bracket extends along the longitudinal direction of the side frame portion, and the seat cushion pad supported by the seat frame has a groove portion extending along the seat width direction. Since the front end of the seat with respect to the spring mounting portion of the bracket is located on the front side of the seat with respect to the groove, the seat rear portion of the seat cushion pad groove portion has a seated passenger's buttocks Considering the current situation that it is often set as a supporting portion, a portion necessary for supporting the buttock can be reinforced by the bracket, and the support state of the buttock of the occupant seated on the seat cushion can be stabilized. In addition, since the contact area between the side frame portion and the seat cushion pad is reduced, the seat cushion pad can be prevented from being scraped by rubbing with the side frame portion.

  Furthermore, in one aspect of the present invention, since the bead-shaped portion is provided on the upper surface portion of the bracket, the shape of the bracket can be stabilized and the strength of the spring mounting portion can be improved. In addition, since the holding state of the spring becomes stable, the occupant's thigh in the sitting state and the getting on / off state can be supported more stably.

It is a perspective view showing a seat frame, a spring, and a bracket to which a seat frame structure according to an embodiment of the present invention is applied. It is the top view seen from the arrow Z direction in FIG. It is a perspective view which expands and shows the state in which the edge part of the spring was attached to the spring attachment part of the bracket in FIG. It is the perspective view which looked at the state in FIG. 3 from another direction. It is a top view which shows the seat cushion pad supported by the seat frame in FIG. It is a top view which shows the positional relationship of the groove part of a seat cushion pad in FIG. 5, and a bracket.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
1 to 6 show a seat frame structure according to an embodiment of the present invention.

  As shown in FIGS. 1, 2, 5, and 6, the vehicle seat 1 to which the seat frame structure of the embodiment of the present invention is applied is a seat that is disposed in a vehicle interior, and is mainly seated by an occupant. A seat cushion 2, a seat back 3 that receives the back of the occupant at the rear end of the seat cushion 2, and a headrest 4 that supports the occupant's head at the top of the seat back 3. The seat cushion 2 of the present embodiment has a substantially square shape having a shape and size corresponding to the seat cushion 2 when viewed from above the vehicle, and is seat cushion such as urethane foam supported by the seat frame 5 on the lower outer periphery. A pad 21 is provided, and the outer surface of the seat cushion pad 21 is covered with a skin material. Note that the seat back 3 in the figure shows the back frame 31 with the back pad and the like removed.

As shown in FIGS. 1 to 4 and 6, the seat frame 5 of the present embodiment includes a pair of left and right side frame portions 51 that are located on both left and right sides of the seat frame 5 in the vehicle width direction (seat width direction). The two springs 52, 53 arranged along the vehicle width direction and spanned between the pair of left and right side frame parts 51, the front frame part 54 that connects the front and rear parts of the pair of left and right side frame parts 51, and the rear Side frame portion 55.
The pair of left and right side frame portions 51 respectively extend along the vehicle front-rear direction (seat front-rear direction), and are arranged at a predetermined interval in the vehicle width direction of the seat frame 5. Further, an attachment surface 51a of the bracket 6 is formed on the upper surface of the side frame portion 51. The attachment surface 51a substantially extends the upper end portion of the side frame portion 51 toward the inner side in the vehicle width direction (sides facing each other). By bending at a right angle, it extends inward in the vehicle width direction and is formed in a flange shape.

  As shown in FIGS. 1 to 4 and 6, the bracket 6 of the present embodiment is a separate member from the side frame portion 51 of the seat frame 5, and the seat frame 5 extends from the mounting surface 51 a of the side frame portion 51. The upper surface portion 61 extends inward in the vehicle width direction, and the vertical surface portion 63 extends downward from the inner end portion of the upper surface portion 61 via the bent portion 62. For this reason, the bracket 6 has a substantially reverse cross-section in which a bent portion 62 that is curved in an arc shape is sandwiched between an upper surface portion 61 that is disposed in a substantially horizontal direction and a vertical surface portion 63 that is disposed in a substantially vertical direction. It is formed in an L shape and is provided so as to extend in the vehicle front-rear direction over a predetermined length along the side frame portion 51. That is, the bracket 6 is provided so as to extend over a predetermined length along the longitudinal direction of the side frame portion 51.

The upper surface portion 61 of the bracket 6 is formed to be wide except for a narrow vehicle rear side, and the outer portion is attached to the mounting surface 51a of the side frame portion 51 so as to be attached. The seat frame 5 is attached so as to protrude from the surface 51a toward the inside of the seat frame 5 in the vehicle width direction. Preferably, the bracket 6 is attached to an attachment surface 51 a on the upper surface of the side frame portion 51. Preferably, the outer edge portion of the bracket 6 is attached to the attachment surface 51 a of the side frame portion 51.
On the lower side of the vertical surface portion 63 of the bracket 6, spring mounting portions 64 and 65 for attaching the end portions 52a and 53a of the springs 52 and 53 are provided. The front spring mounting portion 64 is a wide intermediate portion in the vehicle front-rear direction. The rear spring mounting portion 65 is disposed at a rear portion in the vehicle front-rear direction. The spring mounting portions 64 and 65 are formed by cutting out a part of the vertical surface portion 63 and bending it obliquely upward toward the inner side in the vehicle width direction, and bending the tip portion upward and outward, thereby opening the opening portion. It is formed in a semicircular arc shape that faces outward. Therefore, the springs 52 and 53 are configured to be attached to the spring attachment portions 64 and 65 by hooking and fixing the end portions 52a and 53a on both right and left sides to the tip portion. Moreover, the bracket 6 has a structure in which the bending portion 62 and the spring mounting portions 64 and 65 are allowed to be bent by the load applied to the springs 52 and 53.

  As shown in FIGS. 1 to 4 and 6, the springs 52 and 53 of the present embodiment are elastic members that receive the load of an occupant seated on the seat cushion 2, and are arranged at intervals in the front and rear of the seat frame 5. Has been. In the structure of the present embodiment, the shape of the front spring 52 and the shape of the rear spring 53 are different, and the front spring 52 extends in the vehicle width direction while being bent a plurality of times in the vehicle front-rear direction at a predetermined pitch. The rear spring 53 is a crank-shaped spring that extends in the vehicle width direction while being bent a plurality of times in the vehicle front-rear direction at a larger pitch than the front spring 53. In addition, the left and right end portions 52a and 53a of the springs 52 and 53 are formed in a shape that extends toward the rear of the vehicle and the rear ends are inclined obliquely inward. The attaching / detaching work is simple and the end portions 52a, 53a of the attached springs 52, 53 are prevented from being detached from the spring attaching portions 64, 65. Note that the outer peripheral surfaces of the end portions 52a and 53a of the springs 52 and 53 are coated with paint for preventing the spring mounting portions 64 and 65 from rubbing against the outer peripheral surfaces.

  On the other hand, in the seat frame structure of the present embodiment, as shown in FIGS. 5 and 6, a groove portion 21 a extending along the vehicle width direction is provided in the middle portion of the seat cushion pad 21 in the vehicle longitudinal direction and the vehicle width direction. The body portion supported by the seated occupant is separated by the front and rear positions of the groove 21a. On the other hand, the bracket 6 is formed so as to extend to the vehicle front side from the front spring mounting portion 64, and the end portion 6 a on the vehicle front side is disposed so as to be positioned in front of the vehicle with respect to the groove portion 21 a of the seat cushion pad 21. Has been.

The seat frame structure of the present embodiment takes into account the fact that the rear of the vehicle is often set as a portion that supports the seated occupant's buttocks than the groove 21a of the seat cushion pad 21. That is, in the portion of the rear of the vehicle from the groove portion 21a, the occupant's buttocks seated on the seat cushion 2 is supported by the seat cushion pad 21 and the springs 52 and 53, but the bracket 6 of the present embodiment is It is not provided only in the portion that supports the occupant's buttocks, but is provided in a wide area in the vehicle front-rear direction from the portion to the vehicle front position. As a result, the occupant's buttocks are also supported by the bracket 6 and the side frame 51 from the seat cushion pad 21 and the springs 52 and 53 via the spring mounting portions 64 and 65, thereby increasing the support strength of the occupant's buttocks. It has a structure that enhances.
In addition, when getting on and off, when the occupant performs a movement of sitting on the vehicle seat 1 by sitting down on the side frame portion 51 located on the side portion of the seat cushion 2 and moving the buttocks in parallel with the posture. In addition, since the bracket 6 extends to the vehicle front position from the groove portion 21a of the seat cushion pad 21, the strength to support the parallel movement of the occupant's buttocks is maintained, and the support state of the buttocks is stabilized. It is supposed to be. Also,

  Furthermore, when the occupant seated on the seat cushion 2 corrects the sitting posture, the seat cushion pad 21 may move together. For this reason, if the flange-shaped upper surface end portion of the side frame portion 51 is exposed, the moving seat cushion pad 21 is scraped by the upper surface end portion of the side frame portion 51. On the other hand, in the seat frame structure of the present embodiment, the bracket 6 is provided in the vehicle front-rear direction of the side frame portion 51 to the vehicle front position rather than the groove portion 21a. And the seat cushion pad 21 is prevented from being scraped by rubbing with the side frame portion 51. Further, since the bent portion 62 is curved in an arc shape, it is possible to effectively prevent the seat cushion pad 21 from being scraped by rubbing between the seat cushion pad 21 and the bracket 6.

  Further, as shown in FIGS. 2 to 4, bead-shaped portions 66 and 67 projecting upward of the vehicle are provided on the upper surface portion 61 of the bracket 6 positioned in front of and behind the front spring mounting portion 64 of the present embodiment. Yes. These bead-shaped portions 66 and 67 are formed, for example, by curving a part of the upper surface portion 61 in a semicircular arc shape, and extend along the vehicle width direction. Since such bead-shaped portions 66 and 67 reinforce the bracket 6 and contribute to stabilization of the shape of the upper surface portion 61 and the strength of the front spring mounting portion 64, the bracket 6 loads the springs 52 and 53. Even if the bent portion 62 and the spring mounting portions 64 and 65 are allowed to be bent by the applied load, the spring 52 attached to the front spring mounting portion 64 is stably held and the seat cushion 2 is seated. Even in a state of getting on and off, the thigh of the occupant is stably supported, and a comfortable comfort in the passenger compartment is ensured.

  Thus, in the seat frame structure according to the embodiment of the present invention, the mounting surface 51a of the bracket 6 is formed on the upper surface of the side frame portion 51 located on the left and right sides of the seat frame 5, and the bracket 6 It has an upper surface portion 61 extending from the mounting surface 51a of the frame portion 51 to the inside of the seat frame 5, and a vertical surface portion 63 extending downward from the inner end portion of the upper surface portion 61 via the bent portion 62. Since the spring mounting portions 64 and 65 for attaching the end portions 52a and 53a of the springs 52 and 53 are provided on the surface portion 63, the load applied to the springs 52 and 53 generated when the occupant sits on the seat cushion 2 is reduced to the side frame portion. 51, but also received by the bracket 6 while allowing the bending portion 62 and the spring mounting portions 64 and 65 to bend, and finally the upper surface of the side frame portion 51. The springs 52 and 53 can be received by the mounting surface 51a, and the springs 52 and 53 are firmly and securely held, and the springs 52 and 53 are held firmly and stably while allowing bending including the springs 52 and 53. be able to.

Further, the bracket 6 having a portion such as a bent portion 62 where bending occurs is attached to the attachment surface 51a on the upper surface of the side frame portion 51 in the seat frame structure of the present invention via a wide upper surface portion 61. Yes. On the other hand, since the upper surface of a normal side frame part is set as a flange, it is formed with a narrow width. Therefore, when correcting the seating posture of the occupant and when getting on and off, the occupant's thigh is supported while receiving reaction force with a spring or cushion pad that does not have the upper surface of the side frame, and it is difficult for the foot to move Happens.
On the other hand, in the seat frame structure of the present invention, since the upper surface portion 61 of the bracket 6 forms the upper surface of the side frame portion 51, it becomes possible to support the occupant's thigh while keeping the flexure. The seating feeling of the occupant can be improved in the seated state or when getting on and off, and a smooth occupant getting on and off operation can be secured.

  Further, in the seat frame structure of the present invention, the interval between the side frame portions 51 differs depending on the width of the vehicle to be applied, the width of the vehicle seat 1, the design design, etc., and the setting of the springs 52 and 53 must be reviewed accordingly. Even if not, the end portions 52a and 53a of the springs 52 and 53 are attached to the spring attachment portions 64 and 65 of the vertical wall surface 63 of the bracket 6 attached to the attachment surface 51a of the side frame portion 51. The lengths of the springs 52 and 53 can be adjusted by changing the width dimension of the upper surface portion 61 of the bracket 6. Accordingly, it is possible to reduce the frequency of reviewing the setting of the springs 52 and 53 corresponding to the difference in the seat width and the like, the springs 52 and 53 exhibiting the optimum cushion performance can be easily set on the seat frame 5, and the springs 52 and 53 can be employed in common.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention. Further, in specifying the position in the above description, expressions such as “vehicle longitudinal direction” and “vehicle width direction” are used, but these are used for convenience of description, and in the present invention the position in relation to the vehicle. Is not specified.

  In the seat frame structure of the embodiment described above, the shape of the front spring 52 and the shape of the rear spring 53 are different, but the front spring 52 and the rear spring 53 may be the same shape. good. Further, the spring mounting portions 64 and 65 are formed by notching a part of the vertical surface portion 63, bending the diagonally upward toward the inside in the vehicle width direction, and bending the tip portion upward and outward, thereby opening the opening portion. However, it may be formed in a cylindrical shape or other shapes as long as the end portions 52a and 53a of the springs 52 and 53 can be securely attached. Further, although one spring 52, 53 is disposed in the longitudinal direction of the vehicle, two or more springs may be disposed, and the position where the spring is disposed can be appropriately selected.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 5 Seat frame 6 Bracket 6a End part of vehicle front side 21 Seat cushion pad 21a Groove part 51 Side frame part 51a Mounting surface 52, 53 Spring 52a, 53a Spring end part 61 Upper surface part 62 Bending part 63 Vertical surface portion 64 Front side spring mounting portion 65 Rear side spring mounting portion 66, 67 Bead shape portion

Claims (5)

In the seat frame structure in which the spring is attached to the side frame portion located on the side portion of the seat frame,
A mounting surface of a bracket is formed on the side frame portion,
The bracket has an upper surface portion that extends from the upper surface of the side frame portion to the inside of the seat frame, and a vertical surface portion that extends downward from the inner end portion of the upper surface portion via a bent portion,
A seat frame structure in which a spring mounting portion for attaching an end portion of the spring is provided on the vertical surface portion. The bracket extends along the longitudinal direction of the side frame part,
The seat cushion pad supported by the seat frame is provided with a groove extending along the seat width direction,
2. The seat frame structure according to claim 1, wherein an end portion on the front side of the seat with respect to the spring mounting portion of the bracket is positioned on a front side of the seat with respect to the groove portion.   The seat frame structure according to claim 1, wherein a bead-shaped portion is provided on the upper surface portion of the bracket.   4. The seat frame structure according to claim 3, wherein the bead-shaped portion is located at least on the front side or the rear side of the spring mounting portion in the seat front-rear direction. Seat back,
The vehicle seat which has a seat cushion which has the said seat frame structure as described in any one of Claim 1 to 4.

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