JP6812904B2 - Vehicle seats and their manufacturing methods - Google Patents

Description

The present disclosure relates to a vehicle seat and a manufacturing method thereof, and more particularly to a vehicle seat installed in a vehicle such as an automobile and a manufacturing method thereof.

Conventionally, as a vehicle seat, in addition to the reclining function of holding the seat back at a desired backrest angle, there is known a vehicle seat having a function of tilting the seat back to the extent that it cannot be backed up, such as a walk-in function. ing.

For example, Japanese Patent Application Laid-Open No. 2012-20595 (Patent Document 1) discloses a vehicle seat having a walk-in function. In the vehicle seat, the holding of the seat back can be released by a large tilting mechanism composed of a release plate, a cam, a hook plate, etc. assembled on the outer wall surface of the side frame of the seat back. It is configured so that the seat back can be tilted to the extent that it cannot lean back.

Japanese Unexamined Patent Publication No. 2012-20595

However, when the configuration disclosed in Patent Document 1 is adopted, many of the various components constituting the above-mentioned tilting mechanism are arranged outside the side frame of the seat back in the seat width direction. As a result, there is a problem that the space inside the vehicle is squeezed. In particular, in a vehicle seat equipped with a walk-in function, since the occupant gets on and off through the space on the side of the vehicle seat on which the tilting mechanism is installed, a wider space on the side is secured. Is desirable.

On the other hand, since the tilting mechanism usually requires many components, it is desirable that the structure is as simple as possible, and it is also important to design these components so that they can be assembled efficiently. Is.

Therefore, the present disclosure has been made to solve the above-mentioned problems, and it is possible to narrow the seat width direction while providing a large tilting function that tilts the seat back to the extent that it cannot lean back. Furthermore, it is an object of the present invention to provide a vehicle seat that can be easily manufactured and a method for manufacturing the vehicle seat.

The vehicle seat based on the present disclosure includes a support portion that rotatably supports the seat back with a rotation axis extending in the seat width direction as the center of rotation, a back frame forming the skeleton of the seat back, and the seat back. It is provided with a holding mechanism for holding the seat back in a leaning first state and a releasing mechanism for releasing the holding of the seat back by the holding mechanism and changing the seat back to a tiltable second state. The back frame has a side frame located on one end side in the seat width direction, and the side frame has an outer wall portion located outside in the seat width direction and extending in the seat vertical direction, and a seat width. An inner side wall portion located inside the direction and extending in the vertical direction of the seat, a front side wall portion located on the front side in the front-rear direction of the seat and extending in the vertical direction of the seat, and a rear side portion in the front-rear direction of the seat. By having the rear side wall portion extending in the vertical direction of the seat, it has an internal space defined by the outer wall portion, the inner side wall portion, the front side wall portion, and the rear side wall portion. The holding mechanism has an engaging member provided with an engaging portion that can be engaged with the engaged portion provided on the supporting portion, and the releasing mechanism receives an input from the outside. It has a rotating input member and a cam that rotates by receiving power transmission from the input member. The engaging member rotates by being pressed by the cam, so that the engaging portion is engaged with the engaged portion and the engaging portion is engaged with the engaged portion. It can be switched to the disengaged state. The vehicle seats based on the present disclosure are arranged so as to face each other along the seat width direction, and further include a first plate-shaped member and a second plate-shaped member in which at least a part thereof is housed in the internal space. The first plate-shaped member is arranged closer to the inner side wall portion than the second plate-shaped member. The input member and the cam are configured to be able to rotate together with the first pin extending along the seat width direction as the center of rotation, and the engaging member extends along the seat width direction. It is configured to be rotatable around pin 2 as the center of rotation. The first pin and the second pin are provided so as to penetrate the inner side wall portion, the first plate-shaped member, the second plate-shaped member, and the outer wall portion. The input member is supported by the first pin in a state of being arranged outside the internal space. The cam is supported by the first pin in a state of being sandwiched between the first plate-shaped member and the second plate-shaped member, and the engaging member is the first plate-shaped member and the second plate-shaped member. It is supported by the second pin in a state of being sandwiched by the plate-shaped members. The vehicle seat based on the present disclosure has a sliding contact surface that is in sliding contact with the cam and is fixed to the first plate-shaped member, and the first plate-shaped member and the second plate-shaped member. It further includes a fixed second sleeve, the first pin is slidably inserted into the first sleeve, and the second pin is inserted into the second sleeve.

With this configuration, among the various components required to realize the tilting function, the cam and engaging member, which occupy a relatively large volume, are more than the side frame of the seat back in the seat width direction. Is not located on the outside, but is mainly arranged in the internal space of the side frame, so that the seat width direction can be narrowed. Further, with this configuration, the cam and the engaging member are preliminarily assembled to the first plate-shaped member and the second plate-shaped member by using the first sleeve and the second sleeve, and further, this is a side frame. It is possible to insert the cam and the engaging member into the internal space of the side frame and fix it with the first pin and the second pin, and as a result, the cam and the engaging member can be arranged in the internal space of the side frame by a simple operation. It also facilitates manufacturing.

In the vehicle seat based on the present disclosure, the shape of the through hole of the cam through which the first pin is inserted is a non-circular shape, and the first portion of the portion inserted through the through hole is formed. The shape of the pin may be a shape that matches the shape of the through hole of the cam.

With this configuration, the input member and the cam can be configured to rotate together via the first pin. In particular, the cam and the engaging member are preliminarily assembled to the first plate-shaped member and the second plate-shaped member using the first sleeve and the second sleeve, and further inserted into the internal space of the side frame. When fixing with the 1st pin and the 2nd pin, the 1st pin can rotate together with the cam even though the 1st pin is inserted later with respect to the cam housed inside the side frame. Therefore, it is possible to easily configure the input member and the cam to rotate together with each other via the first pin.

In the vehicle seat based on the present disclosure, the sliding contact surface that is in sliding contact with the first sleeve is defined by the inner peripheral surface of the recess because the recess is provided on the peripheral edge of the through hole of the cam. At the same time, one end of the first sleeve in the axial direction may be inserted into the recess.

With this configuration, the cam and engaging member are preliminarily assembled to the first plate-shaped member and the second plate-shaped member by using the first sleeve and the second sleeve, and further, this is inside the side frame. When the cam is inserted into the space and then fixed with the first pin and the second pin, the cam can be positioned using the first sleeve before being inserted into the side frame, so that the cam can be positioned in the internal space of the side frame. Can be arranged by a simple operation.

In the vehicle seat based on the present disclosure, the support portion may have a cushion frame forming the skeleton of the seat cushion, and a recline connecting the cushion frame and the back frame, in which case. The engaged portion may be provided on the reclining portion.

With this configuration, it is possible to obtain a vehicle seat having both a large tilting function and a reclining function with a simple configuration.

The method for manufacturing a vehicle seat based on the present disclosure is a method for manufacturing a vehicle seat based on the above-mentioned disclosure, in which the first sleeve is fitted into the first plate-shaped member and the first sleeve is fitted. The step of fixing the second sleeve to the plate-shaped member, and the second sleeve fixed to the first plate-shaped member while fitting the cam into the first sleeve fitted to the first plate-shaped member. A step of positioning and arranging the cam and the engaging member with respect to the first plate-shaped member by fitting the engaging member into the first plate-shaped member, and placing the cam and the engaging member in the first plate-shaped member. While fitting the second plate-shaped member into the first sleeve fitted into the first plate-shaped member so as to be sandwiched between the two, the second sleeve fixed to the first plate-shaped member. By fixing the two plate-shaped members, the process of manufacturing the intermediate assembly, the process of inserting the intermediate assembly into the side frame for positioning, and the process of slidable the first pin on the first sleeve. In addition to the step of inserting the second pin into the second sleeve, the input member is fixed to the first pin inserted into the first sleeve, and the second pin is attached to the side frame. It has a fixing process.

By manufacturing the vehicle seat according to the manufacturing method, the cam and the engaging member are previously assembled to the first plate-shaped member and the second plate-shaped member by using the first sleeve and the second sleeve, and further, this is made. Is inserted into the internal space of the side frame and then fixed by the first pin and the second pin, so that the cam and the engaging member can be arranged in the internal space of the side frame by a simple operation. As a result, manufacturing is facilitated.

Based on the present disclosure, a vehicle seat that can be narrowed in the seat width direction and can be easily manufactured while having a large tilting function that tilts the seat back to the extent that it cannot be leaned back. The manufacturing method becomes feasible.

It is a schematic side view which shows the structure of the vehicle seat which concerns on embodiment, and the overturning function. It is a schematic perspective view which shows the skeleton structure of the main part of the vehicle seat shown in FIG. It is an exploded view which shows the assembly structure with respect to the side frame of the seat back of the reclining and the tilting mechanism in the vehicle seat shown in FIG. 3 is a schematic cross-sectional view of a side frame of a seat back along the IVA-IVA line shown in FIG. 3, and is a schematic cross-sectional view showing another configuration example of the side frame. It is a schematic side view of the reclining and tilting mechanism of the vehicle seat shown in FIG. 1. It is a schematic cross-sectional view along the VI-VI line shown in FIG. FIG. 5 is a plan view of the cam shown in FIG. 5 viewed from the inside along the seat width direction. It is a schematic cross-sectional view along the line VIII-VIII shown in FIG. FIG. 5 is a schematic side view showing a state in which the engagement between the tilting mechanism and the reclining is disengaged in the vehicle seat shown in FIG. FIG. 5 is a schematic perspective view showing a state in which the seat back is greatly tilted in the vehicle seat shown in FIG. 1. It is a schematic cross-sectional view for demonstrating the manufacturing method of the vehicle seat which concerns on this embodiment. It is a schematic cross-sectional view for demonstrating the manufacturing method of the vehicle seat which concerns on this embodiment. It is a schematic cross-sectional view for demonstrating the manufacturing method of the vehicle seat which concerns on this embodiment. It is a schematic cross-sectional view for demonstrating the manufacturing method of the vehicle seat which concerns on this embodiment. It is a schematic cross-sectional view which shows the other structural example in the vicinity of 1st pin.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments shown below exemplify a case where the present invention is applied to a vehicle seat configured as an automobile seat and a method for manufacturing the same. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

FIG. 1 is a schematic side view showing a configuration of a vehicle seat and a tilting function according to the present embodiment, and FIG. 2 is a schematic perspective view showing a skeleton structure of a main part of the vehicle seat shown in FIG. is there. First, with reference to these FIGS. 1 and 2, a schematic configuration of a vehicle seat and a large tilting function according to the present embodiment will be described. In addition, in FIG. 1 and FIG. 2, some component parts are omitted for ease of understanding.

The vehicle seat in the present embodiment is assumed to be installed in the vehicle so that the seated occupant faces the front side of the vehicle, and the front-rear direction of the seat coincides with the front-rear direction of the vehicle. The seat vertical direction coincides with the vehicle vertical direction, and the seat width direction coincides with the vehicle width direction. Further, the vehicle seat in the present embodiment is assumed to be installed on the left side of the vehicle, and the left direction of the seat coincides with the outside direction of the vehicle (that is, the direction on the door side) and the right direction of the seat. Corresponds to the vehicle interior direction (that is, the direction toward the right seat side).

As shown in FIG. 1, the vehicle seat 1 includes a seat cushion 2 and a seat back 3. The seat cushion 2 constitutes a portion on which the thigh and buttocks of the occupant sit, and the seat back 3 constitutes a portion on which the back of the occupant sits (that is, the occupant leans back).

As shown in FIGS. 1 and 2, the seat cushion 2 includes a cushion pad on which an occupant sits, a cushion frame 2F that supports the cushion pad and forms the skeleton of the seat cushion 2, and a connecting plate fixed to the cushion frame 2F. 4. It has a slide rail 5 connected to the cushion frame 2F, and a floor bracket 6 fixed to the slide rail 5.

The cushion frame 2F has a side frame 2S extending in the front-rear direction of the seat. A pair of side frames 2S are provided at the left and right positions of the cushion frame 2F in the seat width direction. The side frame 2S is composed of a press-formed product obtained by pressing a metal plate such as a steel plate.

The connecting plate 4 is fixed to the rear end of the side frame 2S in the front-rear direction of the seat, and extends from the rear end of the side frame 2S toward the upper side of the seat. A reclining 10 described later is fixed to the upper end of the connecting plate 4. A pair of connecting plates 4 are provided corresponding to a pair of left and right side frames 2S. The connecting plate 4 is composed of a press-formed product obtained by pressing a metal plate such as a steel plate.

The slide rail 5 extends along the front-rear direction of the seat, and has an upper rail and a lower rail. The upper rail is provided so as to be slidable with respect to the lower rail. A floor bracket 6 is fixed to the lower rail, and a side frame 2S is connected to the upper rail via a link mechanism. A pair of slide rails 5 are provided below the pair of left and right side frames 2S corresponding to the pair of side frames 2S. The slide rail 5 is made of, for example, a metal member. The slide rail 5 is a mechanism for sliding the seat cushion 2 in the front-rear direction of the seat, and the link mechanism is a mechanism for lifting the seat cushion 2 in the vertical direction of the seat. The slide mechanism and the link mechanism may be driven manually or electrically.

The floor bracket 6 is provided below the seat of the slide rail 5. The floor brackets 6 are provided in the front and rear, respectively, corresponding to the pair of left and right slide rails 5. The floor bracket 6 is composed of a press-formed product obtained by pressing a metal plate such as a steel plate. The floor bracket 6 is a member for installing the slide rail 5 on the floor of the vehicle.

The seat back 3 has a back pad on which an occupant sits, and a back frame 3F that supports the back pad and forms the skeleton of the seat back 3. The seat back 3 is erected from the rear end side of the seat cushion 2 in the front-rear direction of the seat toward the upper side of the seat.

The back frame 3F has a side frame 3S extending in the vertical direction of the seat. The lower end of the side frame 3S in the vertical direction of the seat is fixed to the reclining 10 described later. A pair of side frames 3S are provided at left and right positions on the back frame 3F in the seat width direction. The side frame 3S is composed of a press-formed product obtained by pressing a metal plate such as a steel plate.

The reclining 10 connects the seat cushion 2 and the seat back 3 by interposing the connection between the connecting plate 4 and the side frame 3S as described above. The reclining 10 makes it possible to adjust the backrest angle of the seat back 3, and holds the seat back 3 at the backrest angle adjusted by being manually or electrically driven. The details of the reclining 10 will be described later.

A large tilting mechanism 20A is attached to the back frame 3F. The large tilting mechanism 20A tilts the seat back 3 to the extent that it cannot lean back, unlike the adjustment of the backrest angle by the reclining 10 described above. The large tilting mechanism 20A is typically used for a walk-in function. The large tilting mechanism 20A is installed adjacent to the reclining 10 in a space above the seat above the reclining 10. The details of the large tilting mechanism 20A will be described later.

An operation lever 30 for operating the large tilting mechanism 20A is provided at the upper position of the seat back 3 in the vertical direction of the seat. The operating lever 30 is rotatably attached to the seat back 3 via, for example, a hinge.

With reference to FIG. 1, when the occupant operates the operating lever 30 in the direction of the arrow shown in the drawing, the seat back 3 is tilted in the direction of the arrow DR1 shown in the drawing. Here, an urging spring (not shown) is provided between the seat back 3 and the connecting plate 4, so that the urging force of the urging spring is urged in a direction that tilts the seat back 3 forward of the seat. If it is left, the seat back 3 is tilted forward by the urging force of the urging spring by the operation of the operation lever 30 described above.

Here, the walk-in function is a function of expanding the space for getting on and off the vehicle seat 1 behind the seat. As described above, the seat back 3 of the vehicle seat 1 is tilted forward, and usually, the slide mechanism described above is used. Is a function of moving the vehicle seat 1 to the front of the seat in conjunction with.

In addition, in FIG. 1, a state in which the seat back 3 is arranged at a position in the middle of the tilting range toward the front of the seat is shown by a two-dot chain line, but in the present embodiment, it is shown in the figure. The seat back 3 further collapses in the direction of the arrow DR2, and the seat back 3 substantially overlaps the seat cushion 2.

The seat back 3 tilted forward by operating the operation lever 30 returns to the original position by performing an operation caused by the occupant to raise the seat back 3.

FIG. 3 is an exploded view showing an assembly structure of the seat back of the recliner and the tilting mechanism in the vehicle seat shown in FIG. 1 with respect to the side frame. FIG. 4 (A) is a schematic cross-sectional view of a side frame of the seat back along the IVA-IVA line shown in FIG. 3, and FIGS. 4 (B) and 4 (C) are other configurations of the side frame. It is a schematic cross-sectional view which shows an example. Next, prior to explaining the detailed configuration of the reclining and the tilting mechanism in the vehicle seat according to the present embodiment, with reference to FIGS. 3 and 4, the seat back of the reclining and the tilting mechanism The assembly structure for the side frame will be described.

As shown in FIG. 3, the recliner 10 and the tilting mechanism 20A are assembled to the side frame 3S of the seat back 3 in a state where the main portion thereof is unitized. Specifically, the reclining 10 includes its components ratchet 11, guide 12, outer peripheral ring 13, rotary cam 14 (see FIG. 6), hinge cam 15 (see FIG. 6), spring 16 (see FIG. 6), and spring. The cover 17 and the like are assembled to the base plate 21 of the ratchet mechanism 20A in a pre-assembled state, and the ratchet mechanism 20A is attached to the base plate 21 which is a component thereof, and the cam 23 and the first which are also the components thereof. The hook plate 24A, the second hook plate 24B, the cover plate 25, and the like are assembled, whereby the main part of the reclining 10 and the large tilting mechanism 20A is unitized. Here, the unit in which the main parts of the reclining 10 and the tilting mechanism 20A are integrated corresponds to an intermediate assembly. The connecting plate 4 is fixed to the unit in which the above-mentioned reclining 10 and the main part of the tilting mechanism 20A are integrated by assembling the unit to the reclining 10 prior to assembling the unit to the side frame 3S. It may be fixed to the reclining 10 after the unit is assembled to the side frame 3S.

As shown in FIGS. 3 and 4 (A), the side frame 3S is located outside the seat width direction and extends in the vertical direction of the seat, and the outer wall portion 3Sa and is located inside the seat width direction. The inner side wall 3Sb extending in the vertical direction, the front side wall 3Sc located on the front side in the front-rear direction of the seat and extending in the vertical direction of the seat, and the rear side wall portion 3Sc extending in the front-rear direction of the seat and extending in the vertical direction of the seat. It has a rear side wall portion 3Sd. As a result, the side frame 3S has an internal space 3S1 defined by an outer wall portion 3Sa, an inner side wall portion 3Sb, a front side wall portion 3Sc, and a rear side wall portion 3Sd.

The lower end of the side frame 3S in the vertical direction of the seat is open to the outside, whereby the above-mentioned internal space 3S1 is exposed to the outside through the lower end. The unit in which the main part of the recliner 10 and the tilting mechanism 20A described above is integrated is inserted into the internal space 3S1 of the side frame 3S from the lower end of the side frame 3S.

Here, through holes 3a, 3b, 3c are provided at predetermined positions of the outer wall portion 3Sa and the inner side wall portion 3Sb of the side frame 3S, and the above-mentioned unit is inserted into the internal space 3S1 and positioned. The first pin 26A, the second pin 27A, and the third pin 28A are assembled so as to be inserted into the through holes 3a, 3b, 3c and the through holes provided in the tilting mechanism 20A, respectively. The unit is assembled to the side frame 3S.

At the time of this assembly, the large tilting mechanism 20A of the above-mentioned units is mainly accommodated in the internal space 3S1 of the side frame 3S, and the mainly reclining 10 of the above-mentioned units is housed in the internal space 3S1. It is considered to be exposed to the outside without being housed. The portion of the large tilting mechanism 20A near the lower end in the vertical direction of the seat may be exposed to the outside without being accommodated in the internal space 3S1, and the portion of the reclining mechanism 10 near the upper end in the vertical direction of the seat is external. It may be housed in the internal space 3S1 without being exposed to. In particular, the base plate 21 of the large tilting mechanism 20A is arranged so that the portion supporting the reclining 10 is exposed to the outside without being accommodated in the internal space 3S1.

After the above-mentioned unit is fixed to the side frame 3S, the release plate 22, which is a component of the large tilting mechanism 20A, is assembled to the tip of the first pin 26A of the portion protruding outward from the inner side wall portion 3Sb. Be done.

As described above, among the various components constituting the large tilting mechanism 20A, the base plate 21, the release plate 22, the cam 23, the first hook plate 24A and the second hook plate 24B are the outer walls of the side frame 3S in the seat width direction. The cover plate 25 will be arranged inside the seat more than the portion 3Sa, and most of the cover plate 25 will be arranged inside the seat than the outer wall portion 3Sa of the side frame 3S in the seat width direction. Further, among these, the base plate 21, the cam 23, the first hook plate 24A and the second hook plate 24B are all or most of them arranged in the internal space 3S1 of the side frame 3S. The release plate 22 is arranged further inside the seat than the inner side wall portion 3Sb of the side frame 3S in the seat width direction.

As shown in FIG. 4A, in the present embodiment, the side frame 3S is composed of one press-molded product. Specifically, in the present embodiment, the press-molded product is provided with the welded portion 31 by performing the welding process along the abutting surface of the press-molded product bent so as to surround the internal space 3S1. As a result, the side frame 3S is formed in a substantially square tubular shape having a flat cross-sectional view.

Instead of this, a side frame is formed by combining two press-molded products as shown in the side frame 3S-1 shown in FIG. 4 (B) or the side frame 3S-2 shown in FIG. 4 (C). May be. In that case, prepare a pair of press-molded products in which both ends are bent in the same direction, and combine the pair of press-molded products so that the bent portions formed at both ends partially overlap each other. By performing a welding process along the overlapped portion, a welded portion 31 is provided on these pair of press-molded products, whereby the side frames 3S-1 and 3S-2 are formed into a substantially square tubular shape having a flat cross-sectional view. It may be formed in the shape of. When the side frame is configured in this way, the main parts of the recliner 10 and the large tilting mechanism 20A described above are integrated with one of the press-molded products prior to welding the pair of press-molded products described above. The unit may be assembled and then the other press-molded product may be welded to the one press-molded product so as to cover the unit.

Although detailed description thereof will be omitted here, the side frame may be composed of three or more press-molded products, or may be composed of extruded products in some cases. In addition, instead of the above-mentioned welding, the press-molded product may be joined by fastening or the like.

FIG. 5 is a schematic side view of the reclining and tilting mechanism of the vehicle seat shown in FIG. 1, and FIG. 6 is a schematic cross-sectional view taken along the VI-VI line shown in FIG. FIG. 7 is a plan view of the cam shown in FIG. 5 as viewed from the inside along the seat width direction. Further, FIG. 8 is a schematic cross-sectional view taken along the line VIII-VIII shown in FIG. Next, with reference to these FIGS. 5 to 8, a detailed configuration of the vehicle seat reclining and the large tilting mechanism according to the present embodiment will be described. Here, in FIGS. 5, 6 and 8, the case where the seat back of the vehicle seat is held in the first state in which the vehicle seat can be leaned back is shown. Further, in FIGS. 5, 6 and 8, some components are omitted for easy understanding.

As shown in FIGS. 5 and 6, in the vehicle seat 1, the side frame 3S of the back frame 3F forming the skeleton of the seat back 3 has a rotation axis O extending along the seat width direction as a rotation center. It is rotatably supported by a reclining 10 as a support and a connecting plate 4. More specifically, the base plate 21 of the tilting mechanism 20A is fixed to the portion near the lower end of the side frame 3S by the above-mentioned first pin 26A, second pin 27A and third pin 28A, and the base plate 21 is fixed. It is rotatably supported by the reclining 10 and the connecting plate 4. Here, the rotation shaft O is defined by a hinge pin 18 described later of the reclining 10.

The reclining 10 includes a ratchet 11, a guide 12, an outer peripheral ring 13, a rotating cam 14, a hinge cam 15, a spring 16, a spring cover 17, and a hinge pin 18. The ratchet 11 and the guide 12 are both configured in a substantially disk shape, and are assembled in a state in which they can rotate relative to each other. The outer peripheral ring 13 sandwiches and holds the ratchet 11 and the guide 12 in the axial direction so as not to fall off in the axial direction. The ratchet 11 is integrally fixed to the base plate 21 by welding or the like, and the guide 12 is integrally fixed to the connecting plate 4 by welding or the like. The rotary cam 14, the hinge cam 15, and the spring 16 cooperate with each other in conjunction with the rotational movement of the hinge pin 18 to switch between the locked state and the locked state of the ratchet 11 and the guide 12, whereby the ratchet 11 and the guide 12 are switched. The relative position is changed with the rotation axis O as the center of rotation. The hinge pin 18 is connected to a rod 19 (see also FIG. 2) extending along the seat width direction, whereby the recliner provided at the other end in the seat width direction is synchronously operated. ..

Here, a stopper pin 11a is provided toward the inside of the seat at a predetermined position on the outer peripheral portion of the inner wall surface located inside the ratchet 11 in the seat width direction. The stopper pin 11a defines an inclination range toward the front of the seat back 3, and restricts further rotation of the seat back 3 by abutting on the abutting surface 21a provided on the base plate 21.

Further, the outer peripheral surface of the ratchet 11 on the upper side of the seat is formed in a stepped shape so that a step is generated in the seat width direction, and the outer peripheral surface of the portion is formed with a pair of first engaged recesses 11b and a pair. A second engaged recess 11c is provided. More specifically, the portion of the outer peripheral surface of the ratchet 11 closer to the outside of the seat is arranged at a position farther from the rotation axis O, and a pair of first outer peripheral surfaces are arranged along the circumferential direction on the outer peripheral surface of the portion. 1 Engagement recess 11b is provided. Further, the portion of the outer peripheral surface of the ratchet 11 closer to the inside of the seat is arranged at a position closer to the rotation axis O, and a pair of second engagements are arranged so as to line up on the outer peripheral surface of the portion along the circumferential direction. A joint recess 11c is provided. The pair of first engaged recesses 11b and the pair of second engaged recesses 11c correspond to the engaged portions provided on the support portion.

As shown in FIGS. 5, 6 and 8, the tilting mechanism 20A includes a base plate 21, a release plate 22, a cam 23, a first hook plate 24A, a second hook plate 24B, and a cover plate 25. The first pin 26A, the first sleeve 26B, the second pin 27A, the second sleeve 27B, and the third pin 28A are provided. As described above, most of the tilting mechanism 20A is housed in the internal space 3S1 of the side frame 3S.

The base plate 21, the cam 23, the first hook plate 24A, the second hook plate 24B, and the cover plate 25 are arranged so as to overlap each other in the seat width direction. More specifically, the base plate 21 and the cover plate 25 are arranged to face each other at a predetermined distance in the seat width direction, and the cam 23, the first hook plate 24A and the second hook plate 24B are arranged in the space between them. Has been done. Of these, the cam 23 and the first hook plate 24A are arranged adjacent to each other along the vertical direction of the seat, and the first hook plate 24A and the second hook plate 24B have the outer wall portion of the first hook plate 24A. The second hook plate 24B is overlapped and integrated in the seat width direction so as to be located on the 3Sa side and on the inner side wall portion 3Sb side. The base plate 21, the cam 23, the first hook plate 24A, the second hook plate 24B, and the cover plate 25 are made of a press-formed product obtained by pressing a metal plate such as a steel plate. The base plate 21 and the cover plate 25 correspond to the first plate-shaped member and the second plate-shaped member respectively housed in the internal space 3S1 of the side frame 3S and arranged to face each other.

The release plate 22 has a bent elongated plate shape, and is arranged outside the internal space 3S1 so as to be addressed to the inner side wall portion 3Sb of the side frame 3S. The release plate 22 is composed of a press-formed product obtained by pressing a metal plate such as a steel plate. A cable 29 connected to the above-mentioned operating lever 30 is connected to the release plate 22.

The first pin 26A, the second pin 27A, and the third pin 28A are provided so as to penetrate the outer wall portion 3Sa and the inner side wall portion 3Sb of the side frame 3S as described above, whereby the first pin 26A, The second pin 27A and the third pin 28A insert the internal space 3S1 of the side frame 3S. The first pin 26A, the second pin 27A, and the third pin 28A fix the unit formed by integrating the main parts of the reclining 10 and the tilting mechanism 20A to the side frame 3S, and are included in the tilting mechanism 20A. The base plate 21, the cam 23, the first hook plate 24A, the second hook plate 24B, and the cover plate 25 are individually rotatably or non-rotatably assembled to the side frame 3S.

As shown in FIG. 6, the first pin 26A is rotatably supported by the side frame 3S, and the first pin 26A is housed in the internal space 3S1 of the side frame 3S and is welded to the base plate 21. It is inserted through the first sleeve 26B joined by 33. Further, the first pin 26A is inserted into the through holes provided in the base plate 21, the cam 23 and the cover plate 25 in the internal space 3S1, and is further provided in the release plate 22 outside the internal space 3S1. It is inserted through the hole. The first sleeve 26B is inserted into the through hole provided in the base plate 21, and the first pin 26A is inserted into the through hole provided in the base plate 21 via the first sleeve 26B. ..

Here, as shown in FIG. 7, the through hole 23b provided in the cam 23 has a non-circular shape (specifically, a set of opposing sides) having a plane shape orthogonal to the axial direction of the through hole 23b. Is configured to have a substantially rectangular shape that bulges outward in a curved shape). On the other hand, as shown in FIGS. 2 and 6, the portion 26a inserted into the through hole 23b of the first pin 26A has a plane shape orthogonal to the axial direction of the first pin 26A, which is the plane of the through hole 23b of the cam 23. It is configured in a shape that matches the shape. As a result, the cam 23 is meshed with the first pin 26A and rotates together with the first pin 26A as the first pin 26A rotates.

Further, the release plate 22 is joined to the first pin 26A by a welded portion 32. As a result, the release plate 22 is fixed to the first pin 26A and rotates together with the first pin 26A as the first pin 26A rotates.

On the other hand, the first pin 26A is loosely fitted to the pair of through holes 3a provided in the side frame 3S, the through holes provided in the cover plate 25, and the first sleeve 26B. As a result, the side frame 3S, the cover plate 25, and the first sleeve 26B do not rotate together with the first pin 26A, and the first pin 26A is rotatably supported by sliding contact with these members.

As shown in FIG. 7, a concave portion 23c having a circular shape in a plan view is provided on the surface of the cam 23 located on the inner side wall portion 3Sb side along the peripheral edge of the through hole 23b. One end of the first sleeve 26B in the axial direction is inserted into the recess 23c. As a result, the inner peripheral surface of the recess 23c provided in the cam 23 is configured as a sliding contact surface that is in sliding contact with the first sleeve 26B, and the outer circumference of the first sleeve 26B of the portion inserted into the recess 23c. The surface will be configured as a sliding contact surface that is in sliding contact with the cam 23. The concave portion 23c of the cam 23 and one end in the axial direction of the first sleeve 26B of the cam 23 are in a state before assembling the unit in which the reclining 10 and the main part of the tilting mechanism 20A are integrated to the side frame 3S. This is the part used for positioning.

As shown in FIG. 8, the second pin 27A is non-rotatably supported by the side frame 3S because its tip is joined to the outer wall portion 3Sa by the welded portion 34. The second pin 27A is inserted into the second sleeve 27B housed in the internal space 3S1 of the side frame 3S. Further, the second pin 27A is inserted into the through holes provided in the base plate 21, the first hook plate 24A, the second hook plate 24B and the cover plate 25 in the internal space 3S1. The second sleeve 27B is inserted through the through holes provided in the base plate 21, the first hook plate 24A, the second hook plate 24B, and the cover plate 25, and the second pin 27A is the second. It is inserted through these through holes through the sleeve 27B.

Here, the second sleeve 27B is loosely fitted into the through holes provided in the first hook plate 24A and the second hook plate 24B. As a result, the first hook plate 24A and the second hook plate 24B are rotatably supported by sliding contact with the second sleeve 27B.

With reference to FIG. 6, the third pin 28A is non-rotatably supported by the side frame 3S because its tip is joined to the outer wall portion 3Sa by welding or the like. The third pin 28A is inserted into the through hole provided in the base plate 21 and the cover plate 25 in the internal space 3S1 of the side frame 3S. The third pin 28A is for positioning and fixing the base plate 21 and the cover plate 25 housed in the internal space 3S1 with respect to the side frame 3S.

As shown in FIG. 5, the cable 29 connected to the operating lever 30 is connected to the release plate 22 as described above. The release plate 22 is configured to be rotatable around the first connecting shaft O1 defined by the first pin 26A.

The cam 23 is configured to be rotatable around the first connecting shaft O1 defined by the first pin 26A. At the lower end of the cam 23 in the seat width direction, a disengagement protrusion 23a having a predetermined shape is provided. The disengagement protrusion 23a is a portion for pressing the first hook plate 24A in a predetermined direction.

The release plate 22 rotates when pulled by the cable 29. As a result, the cam 23 rotates together with the release plate 22, and the disengagement protrusion 23a provided on the cam 23 moves in the rotational direction. The release plate 22 and the cam 23 correspond to a release mechanism for releasing the holding of the seat back 3 by the holding mechanism described later, and the release plate 22 thereof is a member to be input that rotates by receiving an input from the outside. Correspondingly, the cam 23 corresponds to a member that rotates by receiving power transmission from the input member.

The first hook plate 24A and the second hook plate 24B are configured to be rotatable around the second connecting shaft O2 defined by the second pin 27A. Since the first hook plate 24A and the second hook plate 24B are integrated as described above, they rotate together with the second connecting shaft O2 as the center of rotation.

A predetermined shape of the disengagement recess 24a is provided at the upper end of the first hook plate 24A in the vertical direction of the sheet. The disengagement recess 24a is a portion to be pressed by the disengagement protrusion 23a provided on the cam 23 described above. Further, a pair of first engaging protrusions 24b are provided at the lower ends of the first hook plate 24A in the vertical direction of the sheet. The pair of first engaging protrusions 24b are provided side by side along the outer peripheral surface of the first hook plate 24A. The pair of first engaging protrusions 24b is a portion capable of engaging with the pair of first engaged recesses 11b provided in the ratchet 11 of the reclining 10 described above.

The second hook plate 24B has a larger outer shape than the first hook plate 24A when viewed along the seat width direction. A pair of second engaging protrusions 24c are provided at the lower ends of the second hook plate 24B in the vertical direction of the sheet. The pair of second engaging protrusions 24c are provided side by side along the outer peripheral surface of the second hook plate 24B. The pair of second engaging protrusions 24c is a portion capable of engaging with the pair of second engaged recesses 11c provided in the ratchet 11 of the reclining 10 described above.

The first hook plate 24A and the second hook plate 24B correspond to the engaging members of the holding mechanism that holds the seat back 3 in the first state in which the seat back 3 can be leaned back, and the pair of the first engaging protrusions 24b and the pair described above. The second engaging protrusion 24c corresponds to an engaging portion provided on the engaging member.

Here, the pair of first engaging protrusions 24b and the pair of second engaging protrusions 24c as engaging portions form a pair of first engaged recesses 11b and a pair of second engaged protrusions 24c as engaged portions. In the engaged state engaged with the recess 11c, the large tilting mechanism 20A and the reclining 10 are in an engaged state, whereby the posture of the seat back 3 is maintained, so that the above-mentioned first state in which the backrest is possible is possible. Will be maintained at.

FIG. 9 is a schematic side view showing a state in which the engagement between the tilting mechanism and the reclining is disengaged in the vehicle seat according to the present embodiment, and FIG. 10 shows a state in which the seat back is tilted. It is a schematic perspective view which shows. Next, with reference to FIGS. 9 and 10 and FIG. 5 described above, a large tilting operation of the vehicle seat according to the present embodiment will be described. Here, in FIGS. 9 and 10, the second state in which the holding of the seat back of the vehicle seat is released is shown. Further, in FIGS. 9 and 10, in order to facilitate understanding, some components are not shown.

When the occupant operates the operating lever 30 in the state shown in FIG. 5, as shown in FIG. 9, the release plate 22 is rotated clockwise by the cable 29 with the first connecting shaft O1 as the center of rotation. Along with this, the cam 23 also rotates clockwise with the first connecting shaft O1 as the center of rotation, and the disengagement protrusion 23a of the cam 23 comes into contact with the disengagement recess 24a of the first hook plate 24A. Press.

When the disengagement recess 24a is pressed by the disengagement protrusion 23a, the first hook plate 24A and the second hook plate 24B rotate counterclockwise when viewed from the side with the second connecting shaft O2 as the center of rotation. The pair of first engaging protrusions 24b of the hook plate 24A are disengaged from the pair of first engaged recesses 11b of the ratchet 11, and the pair of second engaging protrusions 24c of the second hook plate 24B are a pair of ratchets 11. It comes off from the second engaged recess 11c of.

At this time, although detailed description thereof will be omitted, the seat back 3 is configured so that the lock of the reclining 10 is released in conjunction with the operation of the operating lever 30, so that the seat back 3 is formed by the reclining 10 as a support portion and the connecting plate. The holding is also released by 4, and the seat back 3 can rotate about the rotation axis O as the rotation center.

That is, by operating the operating lever 30, the pair of first engaging protrusions 24b and the pair of second engaging protrusions 24c as engaging portions are paired with the pair of first engaged recesses 11b as engaged portions. The state shifts to a non-engaged state in which the second engaged recess 11c is not engaged, whereby a state in which the large tilting mechanism 20A and the reclining mechanism 10 are not engaged is realized, and further. The lock of the reclining 10 is also released, and a second state in which the seat back 3 can be tilted is realized.

Therefore, as shown in FIG. 10, when the above-mentioned urging spring is provided between the seat back 3 and the connecting plate 4, the urging spring is provided by the urging force of the urging spring. If not, the seat back 3 is tilted forward by the operation of the occupant's seat back 3. As a result, the vehicle seat 1 is changed to a state in which the seat back 3 cannot be leaned back.

Here, as an example of a method of configuring the reclining 10 to be unlocked in conjunction with the operation of the operating lever 30, the reclining 10 connected to the release plate 22 of the tilting mechanism 20A and the hinge pin 18 of the reclining 10 It is assumed that the operating lever is connected with a cable or the like so that the hinge pin 18 of the reclining 10 is rotated in conjunction with the operation of the operating lever 30.

When the occupant releases the operation of the operation lever 30, the release plate 22 is released from being pulled by the cable 29, and the release plate 22 is returned to the original position by an urging spring or the like (not shown). As a result, the cam 23 also returns to its original position, and at that time, the disengagement protrusion 23a of the cam 23 comes into contact with the other portion of the disengagement recess 24a of the first hook plate 24A and presses it. As a result, by rotating the seat back 3 of the occupant, the pair of first engaging protrusions 24b and the pair of second engaging protrusions 24c as engaging portions are brought into contact with the pair of first engaged protrusions as engaged portions. It returns to the engaged state in which it is engaged with the recess 11b and the pair of second engaged recesses 11c, and shifts to the first state described above.

11 to 14 are schematic cross-sectional views for explaining a method for manufacturing a vehicle seat according to the present embodiment. Hereinafter, a method for manufacturing a vehicle seat according to the present embodiment will be described in detail with reference to FIGS. 11 to 14 and FIG. 3 described above. In addition, in FIGS. 11 to 14, the cross section of the vicinity of the first connecting shaft O1 in the manufacturing process (that is, the vicinity of the portion where the first pin 26A is arranged) is set to (A), and the second connecting shaft in the manufacturing process. A cross section in the vicinity of O2 (that is, in the vicinity of the portion where the second pin 27A is arranged) is shown in (B).

As described above with reference to FIG. 3, in the vehicle seat 1 according to the present embodiment, after the unit in which the main parts of the reclining 10 and the large tilting mechanism 20A are integrated is manufactured, this is the side. It is inserted into the internal space 3S1 of the frame 3S, and then the unit is fixed to the side frame 3S using the first pin 26A, the second pin 27A and the third pin 28A.

More specifically, as shown in FIG. 11A, first, among the through holes provided in the base plate 21, the first sleeve 26B is inserted into the through hole into which the first pin 26A is to be inserted. The first sleeve 26B is fixed to the base plate 21 by the welded portion 31. Along with this, as shown in FIG. 11B, the second sleeve 27B is fixed to the through hole provided in the base plate 21 into which the second pin 27A is to be inserted. To. For the fixing, press-fitting can be preferably used, and instead of this, welding or the like can be performed.

Next, the second hook plate 24B, the first hook plate 24A, the cam 23, and the cover plate 25 are stacked on the base plate 21 in this order. At this time, for the first hook plate 24A and the second hook plate 24B, the second sleeve 27B is inserted into the through holes provided in the first hook plate 24A and the second hook plate 24B, and the cam 23 The first sleeve 26B is inserted into the through hole 23b and the recess 23c provided in the cam 23. Further, regarding the cover plate 25, among the through holes provided in the cover plate 25, the through hole into which the first pin 26A is to be inserted is positioned and arranged so as to overlap the through hole 23b of the cam 23. At the same time, the second sleeve 27B is inserted and fixed in the through hole into which the second pin 27A is to be inserted among the through holes provided in the cover plate 25. For the fixing, press-fitting can be preferably used, and welding or the like can be performed instead. At that time, the reclining 10 is also positioned and arranged with respect to the base plate 21, and the ratchet 11 thereof is interposed between the second hook plate 24B and the cover plate 25. To do so.

As described above, the unit in which the base plate 21, the cam 23, the first hook plate 24A, the second hook plate 24B, the cover plate 25, the first sleeve 26B, the second sleeve 27B, and the reclining 10 are mutually positioned and integrated. Will be produced. Here, the unit corresponds to an intermediate assembly.

Next, as shown in FIGS. 12A and 12B, a unit in which the main parts of the reclining 10 and the tilting mechanism 20A are integrated is inserted into the internal space 3S1 of the side frame 3S. At this time, the hollow portion of the first sleeve 26B and the through hole 3a provided in the side frame 3S overlap, and the hollow portion of the second sleeve 27B and the through hole 3b provided in the side frame 3S overlap with each other. The unit is positioned with respect to the side frame 3S.

Next, as shown in FIG. 13A, the first pin 26A is inserted into the through hole 3a provided in the side frame 3S from the outer wall portion 3Sa side of the side frame 3S. At this time, the first pin 26A is inserted so as to penetrate the large tilting mechanism 20A inserted in the internal space 3S1 of the side frame 3S, and the first pin 26A can slide on the first sleeve 26B. Will be inserted in. Along with this, as shown in FIG. 13B, the second pin 27A is inserted into the through hole 3b provided in the side frame 3S from the inner side wall portion 3Sb side of the side frame 3S. At this time, the second pin 27A is inserted so as to penetrate the large tilting mechanism 20A inserted in the internal space 3S1 of the side frame 3S, and the second pin 27A is inserted into the second sleeve 27B. It will be.

Next, as shown in FIG. 13A, the release plate 22 is assembled to the tip of the first pin 26A that protrudes outward beyond the inner side wall portion 3Sb of the side frame 3S. At this time, the through hole provided in the release plate 22 is inserted into the tip of the first pin 26A, whereby the release plate 22 is in a state of being addressed to the inner side wall portion 3Sb of the side frame 3S. ..

Next, as shown in FIGS. 14 (A) and 14 (B), welding is performed at the locations indicated by reference numerals W in the drawings. Specifically, the tip of the first pin 26A and the release plate 22 are welded, and the tip of the second pin 27A protruding outward beyond the outer wall portion 3Sa of the side frame 3S becomes the outer wall portion 3Sa. Will be welded. As a result, the release plate 22 is fixed to the first pin 26A by the welded portion 32 (see FIG. 6), and the second pin 27A is fixed to the side frame 3S by the welded portion 34 (see FIG. 8).

By going through the series of steps described above, the reclining 10 and the large tilting mechanism 20A are assembled to the side frame 3S. That is, in the method for manufacturing a vehicle seat according to the present embodiment, the cam 23, the first hook plate 24A and the second hook plate 24B are preliminarily used as the base plate 21 and the cover plate 25 by using the first sleeve 26B and the second sleeve 27B. The first pin 26A and the second pin 27A are used to fix the side frame 3S after inserting it into the internal space 3S1 of the side frame 3S.

Here, as described above, the base plate 21, the cover plate 25, the first sleeve 26B and the second sleeve 27B are used to stack the cam 23, the first hook plate 24A and the second hook plate 24B, whereby these base plates are stacked. The cam 23, the first hook plate 24A and the second hook plate 24B will be attached to the cover plate 25, the first sleeve 26B and the second sleeve 27B at appropriate positions. Therefore, the cam 23, the first hook plate 24A, and the second hook plate 24B can be positioned in the seat width direction by this padding, and the cams 23, the first hook plate 24A, and the first hook plate 24B can be positioned in the in-plane direction orthogonal to the seat width direction. Positioning of the hook plate 24A and the second hook plate 24B can be performed at the same time. From the viewpoint of easy assembly and the viewpoint of fastening for positioning, a clearance having a predetermined size is provided between the inner side wall portion 3Sb of the side frame 3S and the base plate 21. It is preferable to have.

In the vehicle seat 1 according to the present embodiment described above, as described above, among the various components constituting the large tilting mechanism 20A, the base plate 21, the cam 23, the first hook plate 24A, and the second The hook plate 24B and the cover plate 25 will be mainly arranged in the internal space 3S1 of the side frame 3S. Therefore, among the various components required to realize the tilting function, the components having a relatively large occupied volume are arranged outside the side frame 3S of the seat back 3 in the seat width direction. Therefore, narrowing in the seat width direction can be realized.

Further, in the vehicle seat 1 according to the present embodiment, as described above, among the various components constituting the large tilting mechanism 20A, the base plate 21, the cam 23, the first hook plate 24A, and the second hook plate Both the 24B and the cover plate 25 are housed in the internal space 3S1 of the side frame 3S. Therefore, among the various components required to realize the tilting function, the components having a relatively large occupied volume are arranged inside the side frame 3S of the seat back 3 in the seat width direction. Since these components are not arranged close to each other or overlapped with each other at the seating position of the occupant, it is possible to realize narrowing in the seat width direction without deteriorating the riding comfort.

Further, in the vehicle seat 1 according to the present embodiment, as described above, the outer wall portion 3Sa and the inner side wall portion 3Sb of the side frame 3S having the internal space 3S1 have the first pin 26A in the internal space 3S1. Since the configuration is connected by the second pin 27A and the third pin 28A, the rigidity of the side frame 3S is improved, and the cam 23, the first hook plate 24A and the second hook plate 24B are in the seat width direction. Since it is sandwiched between the outer wall portion 3Sa and the inner side wall portion 3Sb of the side frame 3S, the rigidity (particularly resistance to twisting) of the cam 23, the first hook plate 24A and the second hook plate 24B is also improved. Become.

Here, in the case of the vehicle seat 1 according to the present embodiment, the side frame 3S, the large tilting mechanism 20A, the reclining 10 and the connecting plate 4 are arranged more linearly along the vertical direction of the seat. Become. Therefore, even when a load is applied to the vehicle seat 1 in the vertical direction, the load can be efficiently released to the outside while suppressing the displacement generated in the skeleton of the vehicle seat 1.

Further, in the vehicle seat 1 according to the present embodiment, as described above, the release plate 22 is arranged outside the side frame 3S in the seat width direction (that is, inside the side frame 3S in the seat width direction). Therefore, the power input by the input means (for example, the operation lever 30 described above, and in some cases, a drive motor provided in place of the operation lever 30) arranged outside the side frame 3S is the power input to the release plate 22 and the release plate 22. It is introduced into the internal space 3S1 of the side frame 3S via the first pin 26A, and can be efficiently transmitted to the cam 23 housed in the internal space 3S1, so that the device configuration is not complicated and the configuration is simple. It is possible to easily realize power transmission.

On the other hand, in the method for manufacturing a vehicle seat according to the present embodiment, as described above, the cam 23, the first hook plate 24A and the second hook plate 24B are preliminarily used by using the first sleeve 26B and the second sleeve 27B. It is assembled to the base plate 21 and the cover plate 25, and is further inserted into the internal space 3S1 of the side frame 3S and fixed by the first pin 26A and the second pin 27A. Therefore, among the various components required to realize the tilting function, the components having a relatively large occupied volume can be arranged in the internal space 3S1 of the side frame 3S by a simple operation, and as a result. As a result, the production will be facilitated, and it will be possible to provide a vehicle seat having a defeating function at a low cost.

Therefore, by adopting the method for manufacturing the vehicle seat 1 according to the present embodiment and the vehicle seat according to the present embodiment, the seat back 3 is provided with a large tilting function of tilting the seat back 3 to the extent that it cannot be leaned back. , The seat width direction can be narrowed, and further, a vehicle seat that can be easily manufactured and a method for manufacturing the vehicle seat can be used.

FIG. 15 is a schematic cross-sectional view showing another configuration example in the vicinity of the first pin. Hereinafter, with reference to FIG. 15, another configuration example in the vicinity of the first pin of the vehicle seat according to the above-described embodiment will be described.

In the vehicle seat 1 according to the above-described embodiment, the large tilting mechanism 20A in which the release plate 22 is arranged inside the seat with respect to the inner side wall portion 3Sb of the side frame 3S in the seat width direction will be described as an example. However, as shown in FIG. 15, the release plate 22 may be a large tilting mechanism 20B arranged outside the outer wall portion 3Sa of the side frame 3S in the seat width direction. In that case, the insertion direction of the first pin 26A with respect to the side frame 3S can be changed.

Also in this case, the first pin 26A is rotatably supported by the side frame 3S, and the first pin 26A is housed in the internal space 3S1 of the side frame 3S and is welded to the base plate 21 by the welded portion 33. It is inserted through the joined first sleeve 26B. Further, the first pin 26A is inserted into the through holes provided in the base plate 21, the cam 23 and the cover plate 25 in the internal space 3S1, and is further provided in the release plate 22 outside the internal space 3S1. It is inserted through the hole. The first sleeve 26B is inserted into the through hole provided in the base plate 21, and the first pin 26A is inserted into the through hole provided in the base plate 21 via the first sleeve 26B. ..

Here, the through hole 23b provided in the cam 23 has a non-circular shape in a plane shape orthogonal to the axial direction of the through hole 23b. On the other hand, the portion 26a inserted into the through hole 23b of the first pin 26A is configured such that the planar shape orthogonal to the axial direction of the first pin 26A matches the planar shape of the through hole 23b of the cam 23. .. As a result, the cam 23 is meshed with the first pin 26A and rotates together with the first pin 26A as the first pin 26A rotates.

Further, the release plate 22 is joined to the first pin 26A by a welded portion 32. As a result, the release plate 22 is fixed to the first pin 26A and rotates together with the first pin 26A as the first pin 26A rotates.

On the other hand, the first pin 26A is loosely fitted to the pair of through holes 3a provided in the side frame 3S, the through holes provided in the cover plate 25, and the first sleeve 26B. As a result, the side frame 3S, the cover plate 25, and the first sleeve 26B do not rotate together with the first pin 26A, and the first pin 26A is rotatably supported by sliding contact with these members.

The surface of the cam 23 located on the inner side wall portion 3Sb side is provided with a concave portion 23c having a circular shape in a plan view along the peripheral edge of the through hole 23b. One end of the first sleeve 26B in the axial direction is inserted into the recess 23c. The concave portion 23c of the cam 23 and one end in the axial direction of the first sleeve 26B of the cam 23 are in a state before assembling the unit in which the reclining 10 and the main part of the tilting mechanism 20A are integrated to the side frame 3S. This is the part used for positioning.

Although detailed description thereof will be omitted here, even when a vehicle seat provided with the large tilting mechanism 20B configured as described above is used, the vehicle seat is manufactured according to the method for manufacturing the vehicle seat according to the above-described embodiment. Depending on the method, the production can be carried out. That is, the cam 23, the first hook plate 24A, and the second hook plate 24B are previously assembled to the base plate 21 and the cover plate 25 by using the first sleeve 26B and the second sleeve 27B, and further, this is attached to the side frame 3S. By inserting it into the internal space 3S1 and fixing it with the first pin 26A and the second pin 27A, the production becomes possible.

Even in the case of such a configuration, the same effect as that described in the above-described embodiment can be obtained.

As described above, the above-described embodiment disclosed this time is an example in all respects and is not limiting. The technical scope of the present invention is defined by the scope of claims and includes all modifications within the meaning and scope equivalent to the description of the scope of claims.

1 Vehicle seat, 2 seat cushion, 2F cushion frame, 2S side frame, 3 seat back, 3F back frame, 3S, 3S-1, 3S-2 side frame, 3S1 internal space, 3Sa outer side wall, 3Sb inner side wall , 3Sc front side wall, 3Sd rear side wall, 3a to 3c through hole, 4 connecting plate (support), 5 slide rail, 6 floor bracket, 10 reclining (support), 11 ratchet, 11a stopper pin, 11b 1st Engagement recess (engaged part), 11c 2nd engaged recess (engaged part), 12 guide, 13 outer ring, 14 rotation cam, 15 hinge cam, 16 spring, 17 spring cover, 18 hinge pin, 19 Rod, 20A, 20B tilting mechanism, 21 base plate (first plate-shaped member), 21a abutting surface, 22 release plate (input member), 23 cam, 23a disengagement protrusion, 23b through hole, 23c recess, 24A first 1 hook plate (engagement member), 24B second hook plate (engagement member), 24a disengagement recess, 24b first engagement protrusion (engagement part), 24c second engagement protrusion (engagement part), 25 cover plate (second plate-like member), 26A first pin, 26B first sleeve, 26a (first pin) part, 27A second pin, 27B second sleeve, 28A third pin, 29 cable, 30 operations Lever, 31-34 welded part, O rotating shaft, O1 first connecting shaft, O2 second connecting shaft.

Claims (5)

A support portion that rotatably supports the seat back with a rotation axis extending in the seat width direction as the center of rotation,
The back frame that forms the skeleton of the seat back and
A holding mechanism that holds the seat back in the first state where it can lean back,
A release mechanism for releasing the holding of the seat back by the holding mechanism and changing the seat back to a tiltable second state is provided.
The back frame has a side frame located on one end side in the seat width direction.
The side frame includes an outer wall portion located outside in the seat width direction and extending in the seat vertical direction, an inner side wall portion located inside the seat width direction and extending in the seat vertical direction, and a seat front-rear direction. By having a front side wall portion located on the front side of the seat and extending in the vertical direction of the seat and a rear side wall portion located on the rear side in the front-rear direction of the seat and extending in the vertical direction of the seat, the outer wall portion, said It has an inner wall portion, an internal space defined by the front side wall portion and the rear side wall portion, and has an internal space.
The holding mechanism has an engaging member provided with an engaging portion that can be engaged with the engaged portion provided on the supporting portion.
The release mechanism has an input member that rotates by receiving an input from the outside, and a cam that rotates by receiving power transmission from the input member.
The engaging member rotates by being pressed by the cam, so that the engaging portion is engaged with the engaged portion and the engaging portion is engaged with the engaged portion. Switched to the disengaged state,
A first plate-shaped member and a second plate-shaped member are further provided, which are arranged so as to face each other along the seat width direction and in which at least a part thereof is housed in the internal space.
The first plate-shaped member is arranged closer to the inner side wall portion than the second plate-shaped member.
The input member and the cam are configured so as to be able to rotate together with the first pin extending along the seat width direction as the center of rotation.
The engaging member is configured to be rotatable about a second pin extending along the seat width direction as a rotation center.
The first pin and the second pin are provided so as to penetrate the inner side wall portion, the first plate-shaped member, the second plate-shaped member, and the outer wall portion.
The input member is supported by the first pin in a state of being arranged outside the internal space.
The cam is supported by the first pin while being sandwiched between the first plate-shaped member and the second plate-shaped member.
The engaging member is supported by the second pin in a state of being sandwiched between the first plate-shaped member and the second plate-shaped member.
It further includes a first sleeve having a sliding contact surface that is in sliding contact with the cam and fixed to the first plate-shaped member, and a second sleeve fixed to the first plate-shaped member and the second plate-shaped member. ,
The first pin is slidably inserted into the first sleeve.
A vehicle seat in which the second pin is inserted into the second sleeve. The shape of the through hole of the cam through which the first pin is inserted is a non-circular shape.
The vehicle seat according to claim 1, wherein the shape of the first pin of the portion inserted through the through hole is a shape that matches the shape of the through hole of the cam. By providing a recess on the peripheral edge of the through hole of the cam, the sliding contact surface that is in sliding contact with the first sleeve is defined by the inner peripheral surface of the recess.
The vehicle seat according to claim 2, wherein one end of the first sleeve in the axial direction is inserted into the recess. The support portion has a cushion frame forming a skeleton of a seat cushion, and a recline connecting the cushion frame and the back frame.
The vehicle seat according to any one of claims 1 to 3, wherein the engaged portion is provided on the reclining. The method for manufacturing a vehicle seat according to any one of claims 1 to 4.
A step of fitting the first sleeve into the first plate-shaped member and fixing the second sleeve to the first plate-shaped member.
By fitting the cam into the first sleeve fitted into the first plate-shaped member and fitting the engaging member into the second sleeve fixed to the first plate-shaped member, the first A step of positioning and arranging the cam and the engaging member with respect to the plate-shaped member,
While fitting the second plate-shaped member into the first sleeve fitted into the first plate-shaped member so as to sandwich the cam and the engaging member with the first plate-shaped member, the first A process of manufacturing an intermediate assembly by fixing the second plate-shaped member to the second sleeve fixed to the plate-shaped member, and
The process of inserting and positioning the intermediate assembly into the side frame,
A step of slidably inserting the first pin into the first sleeve and inserting the second pin into the second sleeve.
A method for manufacturing a vehicle seat, comprising a step of fixing the input member to the first pin inserted into the first sleeve and fixing the second pin to the side frame.

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