Vehicle seat

Abstract

To ensure as much foot space of a rear seat occupant as possible.SOLUTION: A vehicle seat 10 has: a seat cushion 30 having a pair of left and right side frames 42; a back frame 21 coupled to the side frames 42 via a recliner mechanism 50; and a connection pipe 70 that rotatably engages the back frame 21 and the side frames 42 with each other by a four-node linkage, and connects a lifter link 63, which constitutes the four-node linkage, to the pair of left and right side frames 42. The connection pipe 70 has a recess 71, which is formed so that the lifter link 63 widens an opposite gap T to a lower part of the back frame 21, on an external surface of the connection pipe 70 at an engagement position of a sector gear 63b of the lifter link 63 for rotating the four-node linkage and at a position where the opposite gap T between the lifter link 63 and the lower part of the back frame 21 becomes minimum between a lowest stage position and a highest stage position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a connecting pipe structure of a lifter link mechanism that adjusts the height of a seat cushion of a vehicle seat. [Background technology]

[0002] For example, in the vehicle seat disclosed in Patent Document 1, the lifter link mechanism has a connecting pipe that connects left and right rear links in the vehicle width direction to each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO2013-021914 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the connecting pipe described in this document is located below the back frame of the vehicle seat in the vertical direction of the vehicle, which means that when the seat cushion of the vehicle seat is in the lowest position, the space between the vehicle floor and the underside of the connecting pipe is narrow, resulting in a problem of narrow legroom for rear seat passengers sitting in the vehicle seat.

[0005] Therefore, the present invention has been made in consideration of such problems, and its object is to provide a vehicle seat that can ensure as much legroom as possible for rear seat passengers seated in the seat. [Means for solving the problem]

[0006] In order to solve the above problems, a vehicle seat according to one aspect of the present invention is a vehicle seat capable of adjusting the height of a seat cushion of a vehicle, and includes a pair of side frames provided on the left and right sides of the seat cushion, a back frame connected to the pair of side frames via a recliner mechanism, a pair of seat support parts provided on the left and right sides along the longitudinal direction of the vehicle on the floor of the vehicle, a pair of front links and a pair of rear links provided on the front and rear sides of the vehicle so as to rotatably connect the pair of seat support parts and the pair of side frames to each other at left and right positions to form a four-bar link mechanism together with the side frames, and an operating unit that rotates the four-bar link mechanism to adjust the height of the seat cushion. and a lifter link mechanism which is provided as one of the pair of rear links and has a sector gear formed thereon that rotates the four-bar link mechanism by operating the operating unit, and the lifter link mechanism has a lifter link which is provided as one of the pair of rear links and has a sector gear formed thereon that rotates the four-bar link mechanism by operating the operating unit, and a connecting pipe which is rotatably engaged with the pair of side frames and connects the pair of left and right rear links including the lifter link to each other, and the connecting pipe has a recess on its outer surface which is formed so that the opposing gap between the lifter link and the lower part of the back frame is wider than the outer circumferential surface of the connecting pipe at a position where the sector gear of the lifter link is engaged and where the opposing gap between the lifter link and the lower part of the back frame is smallest between the lowermost position and the uppermost position of the lifter link. [Effects of the Invention]

[0007] According to the present invention, it is possible to ensure as large a legroom as possible for rear seat passengers seated in vehicle seats. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are explanatory diagrams of an embodiment of a vehicle seat according to one aspect of the present invention, in which FIG. 1A is a schematic side view of the vehicle seat, and FIG. 1B is an enlarged view of a main part in the ZZ cross section of FIG. 1A. [Figure 2]2A and 2B are diagrams illustrating the change in posture of the connecting pipe when the height of the seat cushion is adjusted using the lifter link mechanism in the vehicle seat shown in FIG. 1, where FIG. 2A shows the relative relationship with other members above the connecting pipe, and FIG. 2B shows the relative relationship with other members below the connecting pipe. [Figure 3] 1A and 1B are diagrams illustrating the change in the posture of the connecting pipe in the vehicle seat shown in FIG. 1, in which (a) is an explanatory diagram illustrating whether or not the connecting pipe interferes within the swing range of the lifter link, (b) shows the opposing gap in the height direction of the surface provided on the underside of the connecting pipe, and (c) shows the relationship with the feet of the rear seat passenger in (b). [Figure 4] These figures explain the relative relationship with other parts in response to changes in the posture of the connecting pipe within the swing range of the lifter link. Figure (a) shows an example in which the relief shape on the upper side of the connecting pipe is formed in the shape of a single convex arc, and Figure (b) shows an example in which the relief shape on the upper side of the connecting pipe is formed by combining two planes. [Figure 5] 1A and 1B are schematic exploded perspective views illustrating the connection structure between the connecting pipe and the left and right rear links that constitute the lifter link mechanism, in which (a) shows an example of the configuration in a conventional lifter link mechanism, (b) shows an example of the configuration in which a recess is formed in part of the outer surface of the connecting pipe but the left and right rear links are the same as those in a conventional lifter link mechanism, and (c) shows an example of the configuration in which a recess is formed in the outer surface of the connecting pipe and the left and right rear links are combined as a two-piece structure. [Figure 6] This is a schematic perspective view explaining the connection structure between the connecting pipe, left rear link (lifter link), and side frame that make up the lifter link mechanism, where (a) shows the state after they have been connected to each other, and (b) shows the disassembled state before they are connected to each other. [Figure 7] 2A and 2B are diagrams for explaining forces acting on various parts of the vehicle seat shown in FIG. 1 (illustrated by images of outline arrows), in which FIG. 2A is a schematic side view of the vehicle seat, and FIG. 2B is a ZZ cross-sectional view of FIG. 2A. [Figure 8]1(b) are shown ((a) and (b)), in which (a) is a diagram explaining the locations of stress concentration due to the forces acting on each part of the sheet shown in FIG. 7, and (b) is a diagram explaining a preferred embodiment corresponding to the stress concentration. [Figure 9] 2A and 2B are schematic perspective views showing an example of attachment of a suspension mat to a connecting pipe in the vehicle seat shown in FIG. 1, the suspension mat being installed inside the seat cushion. [Figure 10] FIG. 1 is a schematic side view illustrating an example of a conventional vehicle seat. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the drawings are schematic. Therefore, it should be noted that the relationship between thickness and planar dimensions, ratios, etc. differ from the actual ones, and the drawings also include portions where the relationship and ratio of dimensions differ from each other. Furthermore, the embodiments described below are intended to exemplify devices and methods for embodying the technical ideas of the present invention, and the technical ideas of the present invention do not limit the materials, shapes, structures, arrangements, etc. of the components to the embodiments described below.

[0010] As shown in FIG. 1, the vehicle seat 10 of this embodiment includes a pair of left and right fixed rails 11 fixed on the floor F of the vehicle and extending in the fore-and-aft direction of the vehicle, and slide rails 12 slidably engaged with each fixed rail 11, at the bottom of the seat frame 40.

[0011] A link support 13 is provided on the front side of the pair of left and right slide rails 12 to pivotally support the lower end of the front link 61. Also, a link support 14 is provided on the rear side of each slide rail 12 to pivotally support the lower end of the rear link 62 (and lifter link 63) shown in FIG. 7(b). A pair of left and right side frames 42 are attached to the pivotal support portions at the upper ends of the links 61, 62 (63) at the front and rear of the vehicle in order to support the seat cushion 30. A back frame 21 is connected to the pair of left and right side frames 42 via a recliner mechanism 50, so that the seat back 20 can be tilted in the fore-and-aft direction of the vehicle.

[0012] The rear ends of the left and right side frames 42 are connected to each other by a connecting pipe 70. Both ends of the connecting pipe 70 are rotatably held in mounting holes in the side frames 42. The front ends of the left and right side frames 42 are connected to each other by a connecting shaft (not shown), and both ends of the connecting shaft are rotatably held in mounting holes in the front parts of the side frames 42.

[0013] A lifter link mechanism 60 including a four-bar link configured to allow the seat cushion 30 to move up and down is provided on the rear side of the side frame 42. As a result, the seat height of the side frame 42 can be adjusted by rotating each of the links 61, 62 (63) at the front and rear of the vehicle in the up and down direction. 7(b), in this embodiment, a sector gear 63b is provided on the left rear link, which is one of the right and left rear links 62, to form the lifter link 63. The lifter link mechanism 60 has an operating unit (not shown) that adjusts the height of the seat cushion 30, and the operating unit can employ a well-known mechanism in which a pinion gear is provided on the end of a drive shaft (not shown).

[0014] In this embodiment, a well-known operating unit is used, and the sector gear 63b of the lifter link 63 is configured to be able to mesh with the pinion gear at the engagement position of the sector gear 63b. When the drive shaft is rotated with the sector gear 63b meshed, the sector gear 63b swings. As a result, the entire side frame 42 can move up and down as shown in the figure, following the swing path of the four-bar link mechanism centered on the lower pivot part of the lifter link 63 and the rear link 62.

[0015] Here, the connecting pipe 70 of this embodiment has a recess 71 formed so as to widen the opposing gap T toward the back frame 21 at the engagement position of the sector gear 63b of the lifter link 63, where the opposing gap T between the lifter link 63 and the lower part of the back frame 21 is at its smallest between the lowest position PL and the highest position PH of the lifter link 63, as shown in Figure 1(b).

[0016] More specifically, in the connecting pipe 70 of this embodiment, as shown in Fig. 1(b), the connecting pipe 70 is crushed in the radial direction to form a recess 71 on the outer surface of the connecting pipe 70. Note that the cross-sectional shape of the recess 71 can be various, as long as it is formed so as to widen the opposing gap T. For example, it can be a linear (flat) shape, an arc shape, or a polyhedral shape combining multiple surfaces. In order to ensure the strength and rigidity (section modulus) of the recess 71, it is desirable to reduce the amount of crushing when forming the recess 71.

[0017] With the connecting pipe 70 of this embodiment, the opposing gap T between the lifter link 63 and the lower part of the back frame 21 can be expanded to a gap T1. As a result, as shown in FIG. 2(a), with the connecting pipe 70 of this embodiment, a margin TN can be obtained by the expanded space (see FIG. 3(a)). Therefore, with this embodiment, the axial center position of the connecting pipe 70 can be positioned higher. Therefore, it is possible to prevent the space around the feet Rf of rear seat passengers from becoming narrower.

[0018] As shown in Fig. 2(b), it is preferable to form a second recess 72 on the lower side of the connecting pipe 70. If the second recess 72 is formed on the lower side of the connecting pipe 70, it is possible to expand the space toward the floor F by the amount of the gap T2 that has been compressed, as shown in Fig. 3(c). This is therefore more preferable in terms of preventing the space around the feet Rf of rear seat passengers from becoming narrower.

[0019] Furthermore, as shown in FIG. 3, in the connecting pipe 70 of this embodiment, when the lifter link 63 is in the lowest position PL, it is preferable to form a second recess 72 by crushing the lower side of the connecting pipe 70. With this configuration, as shown in the figure, the second recess 72 ensures a margin TW in the gap direction with the floor F. This further increases the foot space Rf for rear seat passengers. Note that Figure 3(c) also shows lines (lowest level L, middle level M, and top level U) that indicate the position of the back frame 21 when the full range of motion of the lifter link mechanism 60 relative to the connecting pipe 70 is taken into consideration.

[0020] Here, if the outer surface of the connecting pipe 70 is crushed in the direction of widening the opposing gap T, there is a risk that interference with other components will occur in part of the rotation range in which the lifter link 63 rotates from the lowest position PL to the highest position PH. Therefore, when the recess 71 is formed by crushing it into a linear shape in cross section (a plane along the axial direction of the connecting pipe 70), it is desirable to tilt the cross-sectional shape direction of the recess 71 in a direction that prevents interference when widening the opposing gap T so that the lifter link 63 does not interfere with the back frame 21 between the lowest position PL and the highest position PH.

[0021] Furthermore, when forming the recess 71 in a shape other than a straight line in cross section in the connecting pipe 70 of this embodiment, it is preferable to form the recess 71 in an arc shape in cross section (FIG. 4(a)) or a broken line shape (FIG. 4(b)) made up of a combination of multiple straight lines 71a, 71b, as shown in Fig. 4(a) in order to avoid interference with other components at other positions. Note that the multiple two-dot chain lines shown in the figure indicate an image of the relative passage trajectory of other components over the entire rotation range.

[0022] However, when the connecting pipe 70 and the lifter link 63 are fixed with a jig and welded together during assembly in the manufacturing process of the vehicle seat 10, higher assembly accuracy is required for the relative assembly angle. Therefore, in order to lower the accuracy requirements during assembly and improve assembly workability, it is preferable to simplify the method of crushing the recess 71. For example, it is desirable to make the cross-sectional shape of the recess 71 a linear shape (a plane along the axial direction).

[0023] 6 and 8 show examples of assembly in the manufacturing process of the vehicle seat 10. Also, FIG. 5 shows a conventional example and a comparative example. In the conventional example shown in Figure 5(a), the connecting pipe 170 is simply cylindrical, and the connecting holes of the left and right links 162, 163 connected to both ends of the conventional connecting pipe 170 are also circular. Therefore, the conventional connecting pipe 170 does not have the adjustment margin for adjusting the axial height of the conventional connecting pipe 170 as does the connecting pipe 70 of this embodiment. Therefore, it is difficult to ensure as much legroom as possible for rear seat passengers.

[0024] Furthermore, as shown in a comparative example in the same figure (b), although it is possible to form a recess 71 only in the middle part of the connecting pipe 70, in this case, when passing the links 62, 63 through both ends of the connecting pipe 70, if the connecting holes of the links 62, 63 at both ends are circular, it is difficult to maintain the attachment position of the links 62, 63 at the position of the recess 71 in the middle part.

[0025] On the other hand, as shown in Fig. 1C, the links 62, 63 at both ends of the connecting pipe 70 can be made into a two-piece structure consisting of separate parts 62a, 62b and 63a, 63b that are configured to fit the shape of the recess 71 in the middle portion. With this configuration, the separate parts 62a, 62b and 63a, 63b can be fitted together radially at the position of the recess 71 in the middle portion, thereby achieving the effect of the recess 71 of the connecting pipe 70 of this embodiment. However, such a two-piece structure increases the number of parts and complicates the assembly process.

[0026] In contrast to this, in order to further improve the ease of assembly in the manufacturing process of the vehicle seat 10, in the connecting pipe 70 of this embodiment, the recess 71 and the second recess 72 are formed to have a so-called two-face shape, as shown in Figures 6(b) and 8(b). Furthermore, the two-face shape is formed so that the range of formation extends outward (to both ends) in the width direction of the seat cushion 30 beyond the engagement position with the lifter link 63 in the axial direction.

[0027] In addition, in this embodiment, a fitting hole 63h is formed on the lifter link 63 side, for example by press-forming, so that the fitting hole fits snugly to the two-sided width of the end of the connecting pipe 70, thereby making it possible to easily and reliably maintain the mounting position. 6(b) and 8(b), a multi-step cylindrical collar 80 is provided at the engagement position between the side frame 42 and the connecting pipe 70, and is fitted coaxially from the outside in the axial direction. By making the collar 80 multi-step cylindrical, the gap (space) between the recessed portion 71 is filled by the recessed step portions 80h, and the cross-sectional shape at the engagement position between the side frame 42 and the connecting pipe 70 is a perfect circle.

[0028] Here, if, as shown in Figure 8(a), the recess 71 is formed in the middle of the connecting pipe 70 only at the engagement position of the lifter link 63, there is a risk of stress concentration at the corners of the recess 71 when input force is applied to the side frame 42 in the front-to-back or left-to-right directions, as shown in the image in Figure 7. That is, with this configuration, as shown by the load image in Fig. 7 with the white arrows, a shear force is input to the connecting pipe 70 when a force is input to the rear link 62 and the lifter link 63 in the front-to-rear direction. In addition, a tensile or compressive force is input to the connecting pipe 70 when a force is input to the rear link 62 and the lifter link 63 in the left-to-right direction.

[0029] Stress concentrates at the bent corners caused by plastic deformation of the recessed portion 71 and the second recessed portion 72, and these are also the portions where the plate thickness of the connecting pipe 70 is thinned by crushing the recessed portion 71 and the second recessed portion 72 of the connecting pipe 70. Therefore, in the connecting pipe 70 of this embodiment, as shown in the perspective view of Fig. 9, crushing is performed on the entire outer surface of the pipe over the entire axial direction of the connecting pipe 70, thereby reducing the number of locations where stress concentrates.

[0030] In this way, in the connecting pipe 70 of this embodiment, if recesses 71 are formed over the entire axial direction of both ends of the connecting pipe 70 and the recesses 71 are formed to extend to the outside (both ends) in the width direction of the sheet, this is more suitable for reducing areas where stress is concentrated. Furthermore, if the ends of the connecting pipe 70 were simply plastically deformed to form the recesses 71 and the second recesses 72, rattle would occur at the engagement position between the side frame 42 and the connecting pipe 70. However, in the connecting pipe 70 of this embodiment, by further using the above-mentioned collar 80, the gap at the engagement position between the side frame 42 and the connecting pipe 70 is filled, thereby more reliably preventing rattle from occurring.

[0031] Furthermore, in the connecting pipe 70 of this embodiment, as shown in FIG. 9, it is preferable that the suspension mat 31 be rotatably engaged with the connecting pipe 70 at the mat engaging portion 32 via a fixing resin 90. In this case, it is preferable that the recess 71 is formed to extend axially inward (toward the center) in the width direction of the seat cushion 30 further inward than the engagement position with the lifter link 63, and the fixing resin 90 is formed to fill the gap (space) with the recess 71 and have a semicircular shape that is convex toward the upper side in the cross-sectional shape at the engagement position between the suspension mat 31 and the connecting pipe 70.

[0032] In other words, if only both ends of the connecting pipe 70 were partially plastically deformed to form the recesses 71 and the second recesses 72, stress concentration areas would remain on the sides that were not plastically deformed. In contrast, by adopting the configuration shown in Fig. 9, the entire connecting pipe 70 is plastically deformed along the axial direction to form the recesses 71 and the second recesses 72, thereby eliminating stress concentration areas. Furthermore, if the entire connecting pipe 70 is crushed in the axial direction to form the recess 71 or the second recess 72, rattle may occur at the mutual engagement position between the suspension mat 31 and the connecting pipe 70. However, by adopting the configuration shown in FIG. 9, the gap at the mutual engagement position can be filled with fixing resin 90, thereby more reliably preventing rattle from occurring.

[0033] Next, the effects of the vehicle seat 10 of this embodiment will be described. 10 shows a conventional example of a vehicle seat 100, for example, the lifter link mechanism has a connecting pipe 170 that connects left and right rear links 162, 163 in the vehicle width direction (see FIG. 5(a)). This connecting pipe 170 is located below the back frame 121 of the vehicle seat 100 in the vertical direction of the vehicle. Therefore, in Figure 10, when the seat cushion of the vehicle seat 100 is in the lowest position (solid line position in the same figure), the space between the vehicle floor and the underside of the connecting pipe 170 is narrow, which causes a problem in that the foot space of rear seat passengers sitting in the vehicle seat 100 becomes narrow.

[0034] In contrast, in the vehicle seat 10 of this embodiment, as shown in Figure 1, the connecting pipe 70 forms a recess 71 in a direction that widens the opposing gap T with the back frame 21 at the engagement position of the sector gear 63b of the lifter link 63, where the opposing gap T between the lifter link 63 and the back frame 21 is smallest between the lowest position PL and the highest position PH of the lifter link 63. 2, the vehicle seat 10 of this embodiment can thin the portion of the lifter link 63 on the back frame 21 side in the direction widening the opposing gap T by the amount of the space in the opposing direction where the recess 71 is formed. Therefore, the axis of the connecting pipe 70 can be positioned further upward in accordance with the above-mentioned clearance TN, and it is possible to prevent the foot space Rf of rear seat passengers from becoming narrower [Invention 1].

[0035] Furthermore, in a vehicle seat, as shown in Figure 3(a), in a position where positioning within the rotation range is difficult, if a recess 71 is formed in a direction that widens the opposing gap T, there is a risk of interference with the back frame 21. In contrast, in the vehicle seat 10 of this embodiment, as shown in Figure 3(c), when the recess 71 is formed in a linear shape (i.e., one plane) in cross section, the plane of the recess 71 is tilted to the side that avoids interference so that the lifter link 63 does not interfere with the back frame 21 between the lowest position PL and the highest position PH.

[0036] That is, in the vehicle seat 10 of this embodiment, when the recess 71 is formed by crushing to have a shape other than a single plane, as shown in FIG. 4, it is preferable to give it a convex arc shape (FIG. 4(a)) or a broken line shape combining multiple planes (FIG. 4(b)) in order to prevent interference with other components at other positions. However, as described above, when the connecting pipe 70 and the lifter link 63 are fixed to each other with a jig and welded together during assembly of the vehicle seat 10, the accuracy of the angle of assembly is inferior compared to when the recess 71 is formed on a single flat surface. Therefore, in order to improve assembly workability, it is not preferable for the crushing process to be complicated, and it is preferable to crush the recess 71 into a linear shape (one flat surface). However, when the recess 71 is made linear (one plane), there is a risk of interference with other components at other rotation positions due to dimensional adjustments depending on the shapes of the back frame 21 and the lifter link 63. In such cases, as shown in Figure 3(c), this can be prevented by tilting the surface in a direction that widens the opposing gap T when the recess 71 is made linear (one plane) in order to avoid interference [Invention 2].

[0037] As described above, the vehicle seat 10 of this embodiment can ensure as much legroom as possible for rear seat passengers seated in the vehicle seat 10. The connection structure between the lifter link 63 and the connecting pipe 70 according to the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0038] For example, as shown in Figure 7, if the connecting pipe 70 is crushed only at the position where it engages with the lifter link 63, stress will be concentrated at the corners of the crushed part when input force is applied to the frame in the front-rear and left-right directions. In contrast to this, in the vehicle seat 10 of this embodiment, as shown in FIG. 6, a collar 80 is further provided to fit into the mutual engagement position between the side frame 42 and the connecting pipe 70, and the recess 71 is formed to extend outward (at both ends) beyond the engagement position with the lifter link 63 in the width direction of the seat cushion 30, and the collar 80 fills the gap (space) in the recess 71, thereby maintaining the mutual engagement position between the side frame 42 and the connecting pipe 70 as a perfect circle. As a result, as described above, it is possible to reduce stress concentration points by crushing the axially outer side of the connecting pipe 70. Furthermore, if both ends of the connecting pipe 70 were simply crushed, rattle would occur at the engagement position between the side frame 42 and the connecting pipe 70, as shown in Figure 8(a). However, by filling the gap at the engagement position with the collar 80, rattle can be prevented from occurring, as shown in Figure 8(b) [Invention 3].

[0039] Furthermore, if crushing is performed only on both ends of the connecting pipe 70, a stress concentration portion remains on the side that is not crushed. In contrast, in the vehicle seat 10 of this embodiment, as shown in Fig. 9, the suspension mat 31 is rotatably engaged with the connecting pipe 70 via the fixing resin 90, the recess 71 is formed to extend over the entire axial direction in the width direction of the seat cushion 30 to the axially inner side (center side) of the engagement position with the lifter link 63, and the fixing resin 90 fills the gap (space) in the recess 71, so that the mutual engagement position between the suspension mat 31 and the connecting pipe 70 can be configured to be a semicircle. With this configuration, stress concentration points can be eliminated by crushing the entire axial direction of the connecting pipe 70 to form the recesses 71 extending along the axial direction. Furthermore, crushing the entire axial direction of the connecting pipe 70 may cause rattles at the mutual engagement positions between the suspension mat 31 and the connecting pipe 70, but by filling the gap with the fixing resin 90, rattles can be prevented [Invention 4].

[0040] 3, in the vehicle seat 10 of this embodiment, when the lifter link 63 is in the lowest position PL, the lower side of the connecting pipe 70 can be crushed to form the second recess 72. This configuration is more suitable for further expanding the foot space Rf for rear seat passengers [Invention 5]. [Explanation of symbols]

[0041] 10 Vehicle seats 11 Fixed rail 12 Slide rail 13, 14 Link support 20 Seatback 21 Back Frame 30 seat cushion 31 Suspension Mat 32 Mat engagement part 40 seat frame 41 Cushion Frame 42 Side frame 50 Reclining mechanism 60 Lifter link mechanism 61 Previous Link 62 Next Link 63 Lifterlink 70 Connecting pipe 71 Recess 72 Second recess 80 colors 90 Fixing resin Rf Rear seat passenger legroom PL bottom position PH top position F Vehicle floor

Claims

1. A vehicle seat in which the height of the seat cushion of the vehicle is adjustable, a pair of side frames provided on the left and right of the seat cushion; a back frame connected to the pair of side frames via a recliner mechanism; a pair of seat support parts attached to the left and right of the floor of the vehicle along the longitudinal direction of the vehicle; a pair of front links and a pair of rear links provided at the front and rear of the vehicle to rotatably connect the pair of seat support parts and the pair of side frames to each other at left and right positions to form a four-bar link mechanism together with the side frames; and a lifter link mechanism having an operating part that rotates the four-bar link mechanism to adjust the height of the seat cushion, The lifter link mechanism is a lifter link provided as one of the pair of rear links and having a sector gear formed thereon that rotates the four-bar link mechanism by operation of the operating unit; a connecting pipe rotatably engaged with the pair of side frames to connect the pair of left and right rear links including the lifter link to each other, The connecting pipe is a recess formed on an outer surface of the connecting pipe so as to widen the opposing gap between the lifter link and the lower part of the back frame more than the outer peripheral surface of the connecting pipe at a position where the sector gear of the lifter link is engaged and where the opposing gap between the lifter link and the lower part of the back frame is smallest between the lowermost position and the uppermost position of the lifter link.

2. The recess is formed by crushing the connecting pipe in the radial direction to form a flat surface along the axial direction, 2. The vehicle seat according to claim 1, wherein the direction in which the opposing gap is widened is such that the plane is inclined toward a side that avoids interference so that the lifter link does not interfere with the lower part of the back frame over the entire range from the lowest position to the highest position.

3. a collar that is fitted into an engagement position where the side frame and the connecting pipe are connected; The recessed portion extends outward from both ends in the width direction of the seat cushion beyond an engagement position of the sector gear of the lifter link, The vehicle seat according to claim 1 , wherein the collar is fitted in the axial direction so as to fill a gap between the recess and the side frame, and the collar maintains an engagement position between the side frame and the connecting pipe by a cylindrical surface.

4. The seat cushion is provided with a suspension mat, the suspension mat is rotatably engaged with the connecting pipe via a fixing resin, The recess is formed to extend inward in the width direction of the seat cushion beyond an engagement position of the sector gear of the lifter link, 2. The vehicle seat according to claim 1, wherein the fixing resin fills a gap between the recess and the suspension mat to form a semi-cylindrical cross section at an engagement position between the suspension mat and the connecting pipe.

5. 2. The vehicle seat according to claim 1, wherein an outer surface of the connecting pipe is crushed radially inward so that a lower side of the connecting pipe increases a facing distance from a floor of the vehicle when the sector gear of the lifter link is in a lowest position.

Images