JP2024025079A - Seat spring mounting structure and vehicle seat - Google Patents

Abstract

[Problem] To attenuate the vibration of a seat spring while suppressing an increase in the number of parts and weight. A seat spring mounting structure includes a front frame part 24, a rear frame part 26, and a front locking part 20D and a rear locking part 20A that are respectively locked to the front frame part 24 and the rear frame part 26. It includes an S spring 20 and a damping section 40. The damping portion 40 is constituted by a locking portion between the rear frame portion 26 and the rear locking portion 20A. The locking member 42 of the rear locking portion 20A is locked in a state where it is wrapped around the outer circumference of the rear frame portion 26. As the load toward the lower side of the seat is input to the S spring 20, the force with which the locking member 42 tightens the outer periphery of the rear frame portion 26 increases, and the locking member 42 and the outer periphery of the rear frame portion 26 slide. do. [Selection diagram] Figure 5

Description

The present invention relates to a seat spring mounting structure and a vehicle seat.

Patent Document 1 listed below discloses a vehicle seat that includes a seat frame, an S spring installed on the seat frame, and a vibration damping mechanism provided on the S spring. The vehicle seat described in this document uses a rotary damper as a vibration damping mechanism. The vibration of the S spring can be damped by the viscous resistance of the oil provided inside the rotary damper.

Japanese Patent Application Publication No. 2016-185751

However, in the vehicle seat described in Patent Document 1, it is necessary to provide a rotary damper to damp the vibration of the seat spring (S spring), so there is no improvement in terms of suppressing increases in the number of parts and weight. There is room for

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a seat spring mounting structure and a vehicle seat that can damp vibrations of the seat spring while suppressing an increase in the number of parts and weight.

The seat spring mounting structure of the first aspect constitutes the skeleton of a seat cushion that supports the buttocks of a seated occupant, and includes a pair of frame portions spaced apart from each other in the front-rear direction of the seat, and a pair of the frame portions. a seat spring that has a pair of spring-side locking portions that are respectively locked, and that is deflected and deformed between the pair of spring-side locking portions when a load is input to the lower side of the seat; and one of the frames. and a locking portion between the frame portion and the other spring side locking portion, and the spring side locking portion is configured by at least one of a locking portion between the frame portion and the other spring side locking portion, and the spring side locking portion The spring-side locking portion tightens the outer circumference of the frame when the load is applied to the seat spring toward the lower side of the seat. The damping portion includes a damping portion where the force increases and the spring-side locking portion and the outer peripheral portion of the frame portion slide.

According to the seat spring mounting structure of the first aspect, one spring-side locking portion of the seat spring is locked to one frame portion, and the other spring-side locking portion of the seat spring is locked to the other frame portion. It is locked. Thereby, the seat spring is stretched between the pair of frame parts. When a load toward the lower side of the seat is input to the seat spring, the space between the pair of spring-side locking portions of the seat spring is bent and deformed. In addition, when a load toward the lower side of the seat is input to the seat spring, the force of the spring-side locking part that makes up the damping part tightens the outer periphery of the frame part that makes up the damping part increases, and and the outer periphery of the frame portion slide. This damps the vibrations of the seat spring. In this way, according to the seat spring mounting structure of the first aspect, the vibration of the seat spring can be damped without providing a damping mechanism for a member separate from the pair of frame parts and the seat spring. Further, since it is not necessary to provide a damping mechanism that is a separate member from the pair of frame portions and the seat spring, an increase in the number of parts and weight can be suppressed.

In the seat spring mounting structure of the second aspect, in the seat spring mounting structure of the first aspect, a part of the spring-side locking portion is locked to the frame portion that constitutes the damping portion. A frame-side locking portion is formed, and when a load toward the lower side of the seat is input to the seat spring, a portion of the spring-side locking portion contacts the frame-side locking portion, and then the frame By climbing over the side locking portion, the other part of the spring side locking portion presses the outer peripheral portion of the frame portion.

According to the seat spring mounting structure of the second aspect, when a load toward the lower side of the seat is input to the seat spring, a part of the spring-side locking portion contacts the frame-side locking portion, and then the frame-side locking portion contacts the frame-side locking portion. By climbing over the stop portion, the other part of the spring-side stop portion presses the outer peripheral portion of the frame portion. This allows the spring-side locking portion to increase the force with which it tightens the outer peripheral portion of the frame portion, compared to a configuration in which a part of the spring-side locking portion does not ride over the frame-side locking portion after contacting the frame-side locking portion.

In the seat spring mounting structure of the third aspect, in the seat spring mounting structure of the second aspect, a part of the spring side locking part and another part protrude toward the frame part side. A first convex portion and a second convex portion are respectively formed, and when a load toward the lower side of the seat is input to the seat spring, the first convex portion comes into contact with the frame side locking portion. After that, the second convex portion presses the outer peripheral portion of the frame portion by climbing over the frame-side locking portion.

According to the seat spring mounting structure of the third aspect, by adjusting the amount of protrusion of the first convex portion and the second convex portion, the ability of the damping portion to damp the vibration of the seat spring can be adjusted. .

A vehicle seat according to a fourth aspect includes a seat cushion that supports the buttocks of a seated occupant, a pair of frame portions that constitute a skeleton of the seat cushion and are arranged at intervals in the front-rear direction of the seat, and a seat spring that has a pair of spring-side locking portions that are respectively locked to the frame portion, and that bends and deforms between the pair of spring-side locking portions when a load is input to the lower side of the seat; The spring-side locking portion is configured by at least one of a locking portion between the frame portion and one of the spring-side locking portions, and a locking portion between the other frame portion and the other spring-side locking portion, and The spring-side locking portion is wrapped around and locked around the outer periphery of the frame portion, and when a load toward the lower side of the seat is input to the seat spring, the spring-side locking portion is wrapped around the outer periphery of the frame portion. The damping part is provided with a damping part in which the force for tightening the spring-side locking part is increased and the spring-side locking part and the outer peripheral part of the frame part slide.

According to the vehicle seat of the fourth aspect, one spring-side locking portion of the seat spring is locked to one frame portion, and the other spring-side locking portion of the seat spring is locked to the other frame portion. be done. Thereby, the seat spring is stretched between the pair of frame parts. When a load toward the lower side of the seat is input to the seat spring, the space between the pair of spring-side locking portions of the seat spring is bent and deformed. In addition, when a load toward the lower side of the seat is input to the seat spring, the force of the spring-side locking part that makes up the damping part tightens the outer periphery of the frame part that makes up the damping part increases, and and the outer periphery of the frame portion slide. This damps the vibrations of the seat spring. In this manner, according to the vehicle seat of the fourth aspect, vibrations of the seat spring can be damped without providing a damping mechanism of a member separate from the pair of frame portions and the seat spring. Further, since it is not necessary to provide a damping mechanism that is a separate member from the pair of frame portions and the seat spring, an increase in the number of parts and weight can be suppressed.

The seat spring mounting structure and vehicle seat according to the present invention have an excellent effect of being able to damp vibrations of the seat spring while suppressing an increase in the number of parts and weight.

FIG. 2 is a side view schematically showing a vehicle seat. FIG. 3 is a perspective view of a plurality of S springs and the like as viewed diagonally from the front side of the seat. FIG. 3 is a cross-sectional view showing a cross section of a rear locking portion and a rear frame portion that constitute the damping portion of the first embodiment. FIG. 3 is a sectional view showing a cross section of a rear locking portion and a rear frame portion that constitute the damping portion of the first embodiment, and shows a state in which a load toward the lower side of the seat is input to the S spring. FIG. 3 is a sectional view showing a cross section of a rear locking portion and a rear frame portion that constitute the damping portion of the first embodiment, and shows a state in which a load toward the lower side of the seat is input to the S spring. FIG. 7 is a sectional view showing a cross section of a rear locking part and a rear frame part that constitute a damping part of a second embodiment. FIG. 7 is a sectional view showing a cross section of a rear locking part and a rear frame part that constitute a damping part of a third embodiment. FIG. 7 is a sectional view showing a cross section of a rear locking part and a rear frame part that constitute a damping part of a fourth embodiment. It is a sectional view showing the cross section of the rear lock part and the rear frame part which constitute a damping part of a 5th embodiment.

First, the basic configuration of a vehicle seat 10 according to an embodiment of the present invention will be explained using FIGS. 1 and 2, and then, using FIGS. The configuration of is explained below. Note that arrow FR, arrow UP, arrow RH, and arrow LH shown in the figure respectively indicate the front side, the upper side, the right side, and the left side of the seat as viewed from the occupant seated on the vehicle seat 10. Hereinafter, when a description is made simply using front and rear, up and down, and left and right directions, unless otherwise specified, the front and back directions of the seat front and back, the top and bottom of the seat up and down direction, and the left and right sides of the seat left and right direction are meant, unless otherwise specified.

(Basic configuration of vehicle seat 10)
As shown in FIG. 1, the vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant, and a seat back 14 that supports the back of the seated occupant.

The seat cushion 12 includes a seat cushion frame 18 that constitutes the skeleton of the seat cushion 12, an S spring 20 attached to the seat cushion frame 18, and an S spring 20 that is disposed above the S spring 20 and attached to the seat cushion frame 18. An attached seat cushion pad 22 is provided.

The seat cushion frame 18 includes a pair of left and right side frame portions (not shown) arranged at intervals in the left-right direction and extending in the front-rear direction, and a front frame portion serving as a frame portion that connects the front end sides of the pair of left and right side frame portions in the left-right direction. 24, and a rear frame portion 26 as a frame portion that connects the rear end sides of the pair of left and right side frame portions in the left-right direction. The front frame portion 24 is formed, for example, by press working or the like on a steel sheet material. The rear frame portion 26 is, for example, formed in a cylindrical shape with the left-right direction as the axial direction.

As shown in FIG. 2, the S spring 20 as a seat spring is formed by bending a bar-shaped steel material. Here, in this embodiment, four S springs 20 are provided side by side in the left-right direction. The rear end portions of the four S springs 20 serve as a rear locking portion 20A as a spring side locking portion. The rear locking portion 20A is curved into a U-shape with an open lower side. The rear locking portion 20A is configured to be locked to the rear frame portion 26 (see FIG. 1) of the seat cushion frame 18. Further, the front side portions of the rear locking portions 20A of the four S springs 20 are connected in the left-right direction via a connecting plate 28 formed in a plate shape.

Further, the four S springs 20 include an inclined portion 20B that extends downward from the lower end of the front side of the rear locking portion 20A toward the front side. An intermediate portion of the inclined portion 20B in the front-rear direction is bent in the left-right direction. The two left inclined portions 20B are connected in the left-right direction via a support plate 30 formed in a plate shape. Further, the two slope portions 20B on the right side are connected in the left-right direction via a support plate 30 formed in a plate shape.

Moreover, the four S springs 20 are provided with a horizontal portion 20C extending toward the front side from the front end of the inclined portion 20B. An intermediate portion of the horizontal portion 20C in the front-rear direction is bent in the left-right direction. Further, the front end portions of the horizontal portions 20C of the four S springs 20 serve as front locking portions 20D as spring-side locking portions. As shown in FIGS. 1 and 2, the front locking portion 20D is configured to be locked to the front frame portion 24 of the seat cushion frame 18.

As shown in FIGS. 1 and 2, in a state where the four S springs 20 are stretched between the rear frame part 26 and the front frame part 24 of the seat cushion frame 18, a load to the downward side is applied. When input to the four S springs 20 via the seat cushion pad 22, the inclined portion 20B and the horizontal portion 20C of the four S springs 20 are bent and deformed.

As shown in FIG. 1, the seat cushion pad 22 is formed using urethane foam or the like. This seat cushion pad 22 is attached to the seat cushion frame 18 while being arranged along four S springs 20 (see FIG. 2). Note that the surface of the seat cushion pad 22 facing the seated occupant is covered with a skin material (not shown).

(Configuration for damping vibration of S spring 20)
Next, the configuration of the damping section 40 of the first embodiment for damping the vibration of the S spring 20 will be described using FIGS. 3 to 5. Note that there are some points where the configuration of the S spring 20 shown in FIGS. 3 to 5 and the configuration of the S spring 20 shown in FIG. 3 used in explaining the general configuration of the vehicle seat 10 do not match each other. be.

FIG. 3 shows a cross-sectional view of the locking portion between the rear locking portion 20A of the S spring 20 and the rear frame portion 26, taken along the front-back direction and the up-down direction. Note that cross-sectional hatching is omitted in FIG. 3 and FIGS. 4 to 9 used in later explanations.

As shown in FIG. 5, the damping section 40 of this embodiment is constituted by a locking portion between the rear locking section 20A of the S spring 20 and the rear frame section 26.

A locking hole 26A serving as a frame-side locking portion is formed below a portion of the rear frame portion 26 where the rear locking portion 20A of the S spring 20 is locked. The locking hole 26A is a through hole that communicates the inner space and the outer space of the rear frame portion 26. Furthermore, the locking hole 26A has a rectangular shape when viewed from below. Further, the rear edge (rear edge 26A1) of the locking hole 26A has a planar shape along the left-right direction and the radial direction of the rear frame portion 26.

A locking member 42 serving as a spring-side locking portion is fixed to the rear locking portion 20A of the S spring 20. The locking member 42 of this embodiment is formed using a resin material, for example, and is formed integrally with the aforementioned connection plate 28 (see FIG. 2). Note that the locking member 42 constitutes a part of the rear locking portion 20A of the S spring 20.

The locking member 42 includes a curved portion 42A that is curved in a shape corresponding to the upper portion of the rear frame portion 26. Further, the locking member 42 includes a rear side extension portion 42B extending downward from the rear end of the curved portion 42A. Further, the locking member 42 includes a front extension portion 42C that extends downward from the front end of the curved portion 42A so as to be inclined forward. Further, the locking member 42 includes a first convex portion 42D that projects from the rear side extension portion 42B toward the rear frame portion 26 side (front side). The shape of the first convex portion 42D when viewed from the left and right is a substantially triangular shape with the rear frame portion 26 side pointed. Further, the locking member 42 includes a second convex portion 42E that projects from the front side extension portion 42C toward the rear frame portion 26 side (rear side). The shape of the second convex portion 42E when viewed from the left and right direction is approximately trapezoidal with the rear frame portion 26 side narrowed. Note that before the rear locking portion 20A of the S spring 20 is locked to the rear frame portion 26, the distance between the first convex portion 42D and the second convex portion 42E is smaller than that of the rear frame portion 26. is smaller than the outer diameter of

When the rear locking portion 20A of the S spring 20 is locked (wrapped) on the rear frame portion 26, that is, the locking member 42 is locked (wrapped) on the rear frame portion 26. In the state shown in FIG. It becomes a state of being stuck. In addition, when the locking member 42 is locked to the rear frame portion 26, the tip of the first convex portion 42D is disposed within the locking hole 26A of the rear frame portion 26, and the second convex portion The portion 42E is in contact with the lower outer peripheral surface of the front end portion of the rear frame portion 26.

(Actions and effects of this embodiment)
Next, the operation and effects of this embodiment will be explained.

As shown in FIGS. 1, 2, and 3, when a vehicle occupant sits on the vehicle seat 10 of this embodiment, a downward load is input to the S spring 20 via the seat cushion pad 22. . As a result, the inclined portion 20B and the horizontal portion 20C of the S spring 20 are bent and deformed downward. Here, the downward load input to the S spring 20 fluctuates due to vibrations and the like as the vehicle travels. As a result, the inclined portion 20B and the horizontal portion 20C of the S spring 20 are repeatedly deformed in the vertical direction. That is, the S spring 20 vibrates.

Here, when a downward load is input to the S spring 20, the locking member 42 rotates with respect to the rear frame portion 26 from the position shown in FIG. 3 to the position shown in FIG. At this time, the locking member 42 and the rear frame portion 26 slide. Further, as shown in FIG. 4, when the locking member 42 rotates in the above direction relative to the rear frame portion 26, the first convex portion 42D of the locking member 42 engages the locking member formed on the rear frame portion 26. It contacts the trailing edge 26A1 of the hole 26A. Furthermore, when a higher downward load is input to the S spring 20, as shown in FIG. Get over the trailing edge 26A1 of 26A. As a result, the locking member 42 is deformed so that the distance between the first convex portion 42D and the second convex portion 42E becomes wider. Further, when the locking member 42 is deformed in this way, the restoring force of the locking member 42 increases the force with which the locking member 42 tightens the outer circumference of the rear frame portion 26, and in particular, the second protrusion of the locking member 42 The contact pressure between the shaped portion 42E and the outer peripheral portion of the rear frame portion 26 increases. Here, when the first convex portion 42D of the locking member 42 crosses the rear edge 26A1 of the locking hole 26A formed in the rear frame portion 26, the second convex portion 42E of the locking member 42 and the rear The second convex portion 42E of the locking member 42 and the outer circumferential portion of the rear frame portion 26 slide as the contact pressure with the outer circumferential portion of the frame portion 26 increases. Thereby, the vibration of the S spring 20 can be damped. In this manner, in this embodiment, the vibration of the S spring 20 can be damped without providing a damping mechanism that is a separate member from the seat cushion frame 18 and the S spring 20. Further, since it is not necessary to provide a damping mechanism that is a separate member from the seat cushion frame 18 and the S spring 20, an increase in the number of parts and weight can be suppressed.

Furthermore, in this embodiment, compared to a configuration in which the first convex portion 42D of the locking member 42 does not go over the rear edge 26A1 of the locking hole 26A formed in the rear frame portion 26, the locking member 42 is The force for tightening the outer peripheral portion of the portion 26 can be effectively increased.

In addition, in the configuration of the locking member 42 of this embodiment, the ability of the damping part 40 to damp the vibration of the S spring 20 is adjusted by adjusting the amount of protrusion of the first convex part 42D and the second convex part 42E. can do.

In addition, although this embodiment demonstrated the example which provided the 1st convex-shaped part 42D and the 2nd convex-shaped part 42E in the locking member 42, this invention is not limited to this. Whether or not to provide the first convex portion 42D and the second convex portion 42E on the locking member 42 may be determined as appropriate in consideration of the shape of the rear frame portion 26 and the like.

(Second Embodiment to Fifth Embodiment)
Next, the configuration of the damping section 40 of the second to fifth embodiments will be explained. In addition, in the damping section 40 of the second embodiment to the fifth embodiment, the members and parts corresponding to the damping section 40 of the first embodiment described above include the members and parts corresponding to the damping section 40 of the first embodiment. The same reference numerals may be used and the explanation thereof may be omitted.

As shown in FIG. 6, in the damping part 40 of the second embodiment, the first convex part 42D protrudes from the front side extension part 42C toward the rear frame part 26 side (rear side), and the second The convex portion 42E is configured to protrude from the rear side extension portion 42B toward the rear frame portion 26 side (front side). Further, the locking hole 26A is formed on the front side of the lower portion of the rear frame portion 26.

As shown in FIG. 7, in the damping part 40 of the third embodiment, the first convex part 42D protrudes from the front side extension part 42C toward the rear frame part 26 side (rear side), and the second The convex portion 42E is configured to protrude from the rear side extension portion 42B toward the rear frame portion 26 side (front side). Furthermore, in the damping section 40 of the third embodiment, a convex bead 26B serving as a frame-side locking section is formed on the front side of the lower portion of the rear frame section 26. The convex bead 26B protrudes radially outward from the outer peripheral surface of the rear frame portion 26. When a downward load is input to the S spring 20, the first convex portion 42D contacts the convex bead 26B and then rides over the convex bead 26B.

As shown in FIG. 8, the structure of the damping section 40 of the fourth embodiment is similar to the structure of the damping section 40 of the first embodiment, but in the damping section 40 of the fourth embodiment, In place of the locking hole 26A, a concave bead 26C as a frame-side locking portion is formed in the rear frame portion 26. Further, as shown in FIG. 9, the structure of the damping section 40 of the fifth embodiment is similar to the structure of the damping section 40 of the second embodiment, but the damping section 40 of the fifth embodiment Here, instead of the locking hole 26A, a concave bead 26C as a frame-side locking portion is formed in the rear frame portion 26. The concave bead 26C is formed by recessing a part of the rear frame portion 26 radially inward of the rear frame portion 26.

The damping section 40 of the second to fifth embodiments described above can also damp the vibration of the S spring 20, similarly to the damping section 40 of the first embodiment.

In each of the embodiments described above, an example has been described in which the damping section 40 is constituted by the rear locking section 20A of the S spring 20 and the locking section of the rear frame section 26, but the present invention is not limited to this. Not done. For example, the damping portion 40 may be configured by a locking portion between the front locking portion 20D of the S spring 20 and the front frame portion 24. Further, the damping portion 40 is constituted by both the locking portion between the rear locking portion 20A of the S spring 20 and the rear frame portion 26 and the locking portion between the front locking portion 20D of the S spring 20 and the front frame portion 24. You can leave it there.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented with various modifications other than the above without departing from the spirit thereof. Of course.

10 Vehicle seat 12 Seat cushion 20 S spring (seat spring)
20A Rear locking part (spring side locking part)
20D Front locking part (spring side locking part)
24 Front frame part (frame part)
26 Rear frame part (frame part)
26A Locking hole (frame side locking part)
26B Convex bead (frame side locking part)
26C concave bead (frame side locking part)
40 Damping part 42 Locking member (spring side locking part)
42D First convex portion 42E Second convex portion

Claims (4)

a pair of frame portions that constitute the skeleton of a seat cushion that supports the buttocks of a seated occupant and are spaced apart from each other in the front-rear direction of the seat;
A seat spring that has a pair of spring-side locking portions that are respectively locked to the pair of frame portions, and is deformed by bending between the pair of spring-side locking portions when a load is input to the lower side of the seat. and,
The spring-side locking portion is configured by at least one of a locking portion between one of the frame portions and one of the spring-side locking portions, and a locking portion between the other frame portion and the other spring-side locking portion. The stop portion is wrapped around and locked around the outer circumferential portion of the frame portion, and when a load toward the lower side of the seat is input to the seat spring, the spring side lock portion is engaged with the frame portion. a damping part in which the force to tighten the outer peripheral part is increased and the spring-side locking part and the outer peripheral part of the frame part slide;
Seat spring mounting structure with The frame part constituting the damping part is formed with a frame side locking part to which a part of the spring side locking part is locked,
When a load toward the lower side of the seat is input to the seat spring, a part of the spring-side locking portion contacts the frame-side locking portion and then climbs over the frame-side locking portion, so that the spring The seat spring mounting structure according to claim 1, wherein the other part of the side locking part presses the outer peripheral part of the frame part. A first convex portion and a second convex portion protruding toward the frame portion are formed on a portion of the spring-side locking portion and another portion, respectively,
When a load toward the lower side of the seat is input to the seat spring, the first convex portion contacts the frame-side locking portion and then climbs over the frame-side locking portion, thereby causing the second convex portion to The seat spring mounting structure according to claim 2, wherein the portion presses an outer peripheral portion of the frame portion. a seat cushion that supports the buttocks of a seated occupant;
a pair of frame portions that constitute a skeleton of the seat cushion and are spaced apart from each other in the front-rear direction of the seat;
A seat spring that has a pair of spring-side locking portions that are respectively locked to the pair of frame portions, and is deformed by bending between the pair of spring-side locking portions when a load is input to the lower side of the seat. and,
The spring-side locking portion is configured by at least one of a locking portion between one of the frame portions and one of the spring-side locking portions, and a locking portion between the other frame portion and the other spring-side locking portion. The stop portion is wrapped around and locked around the outer circumferential portion of the frame portion, and when a load toward the lower side of the seat is input to the seat spring, the spring side lock portion is engaged with the frame portion. a damping part in which the force to tighten the outer peripheral part is increased and the spring-side locking part and the outer peripheral part of the frame part slide;
A vehicle seat equipped with