JP6963197B2 - Vehicle seat - Google Patents

Description

The present disclosure relates to vehicle seats with height-adjustable seat cushions.

Vehicle seats with height-adjustable seat cushions are known. For example, in Patent Document 1, in a seat cushion that moves up and down by a link, a torsion bar is arranged in a pipe connecting a pair of left and right links, and the urging force of the torsion bar assists the raising of the seat cushion. Is described. On one end side of the torsion bar and the pipe, a position holding member for holding the torsion bar is fitted into an inner hole of the pipe in order to align the axis of the torsion bar with the central axis of the pipe. Further, Patent Document 2 describes that the cylindrical position holding member is composed of two semi-cylindrical parts.

Japanese Unexamined Patent Publication No. 2007-23253 Japanese Unexamined Patent Publication No. 2015-3577

However, the conventional position-holding member may rotate relative to the torsion bar, and the position of the position-holding member that receives the lateral force from the torsion bar may change. Therefore, it is necessary to secure the strength of the position holding member over a wide angle range, which hinders the miniaturization and weight reduction of the position holding member.

Further, if the end portion of the torsion bar is bent, it becomes difficult to assemble with the position holding member described in Patent Document 1. Since the position holding member described in Patent Document 2 is composed of two parts, it can be assembled, but the number of parts is large and the assembling work is complicated.

The present invention is a position-holding member that holds a torsion bar and is supported by a connecting pipe in a vehicle seat provided with the height-adjustable seat cushion, and holds a position having a small frictional resistance with respect to the connecting pipe. It is an object of the present invention to provide a vehicle seat provided with a member. Further, in at least some embodiments of the present invention, it is an object of the present invention to provide a position holding member which is easy to assemble.

The vehicle seat (1) according to at least some embodiments of the present invention includes a base member (2) supported by a vehicle body, a cushion frame (5) constituting a frame of the seat cushion (3), and the base. A link mechanism (6) that supports the cushion frame so as to be displaceable up and down with respect to a member, a drive mechanism (7) that drives the cushion frame in the vertical direction via the link mechanism, and the cushion frame upward. Extending between the left and right sides of the cushion frame to urge towards, and at the left and right first (17) and second (16b) ends, each other at the pivot of the link mechanism. A vehicle seat with the height-adjustable seat cushion having a torsion bar (14) coupled to a first portion (12) and a second portion (8) that rotate relative to each other. A shaft portion (15) extending in the left-right direction, and an extension extending at least partially on the second end side in a direction intersecting the shaft portion and coupled to the second portion. The first portion has a portion (16), which non-rotatably supports the first end of the torsion bar, and the second end side of the shaft portion of the torsion bar is the shaft of the torsion bar. The cushion frame and one of the link mechanisms are supported by a position holding member (24) for suppressing the displacement of the core, and one of the cushion frame and the link mechanism has a connecting member (12) that is rotatable with respect to the other. The connecting member constitutes the first portion, the position holding member has a main body portion (25) having a side peripheral wall including a tubular contour, and the main body portion is an inner hole (13) of the connecting member. ), And a protruding portion (34) is provided on the outer peripheral surface of the main body portion of the position holding member.
In the vehicle seat according to at least some embodiments of the present invention, in the above configuration, the main body portion includes a through hole (27) through which the shaft portion is inserted, and the side peripheral wall has the through hole. It is characterized by having an inner peripheral wall (31) to be defined, an outer peripheral wall (32) supported by the first portion, and a plurality of reinforcing walls (33) connecting the inner peripheral wall and the outer peripheral wall. And.
The vehicle seat according to at least some embodiments of the present invention is characterized in that, in the above configuration, the reinforcing wall extends in the radial direction.
The vehicle seat according to at least some embodiments of the present invention is characterized in that, in the above configuration, the reinforcing wall is aligned with the protrusion in the radial direction.
Vehicle seat according to at least some embodiments of the present invention, in the any of the above construction, the protruding portion is provided in plurality so as to extend along the axial direction, at least one periphery of the projecting portion The length in the direction is shorter than the circumferential distance between the two protrusions adjacent to each other in the circumferential direction.
In any of the above configurations, the vehicle seat according to at least some embodiments of the present invention has a collar portion (28) extending outward in the radial direction from the outer peripheral surface. The protruding portion is continuous with the flange portion.
Vehicle seat according to at least some embodiments of the present invention, in the above-mentioned configuration, for the outer peripheral surface, the protruding length to the radial direction of the protrusion in the radial direction of the flange portion It is characterized by being shorter than the extension length.
In any of the above configurations, the vehicle seat according to at least some embodiments of the present invention extends radially to the inner end face in the left-right direction so that the position-holding member can accept the extension. It is characterized by having a receiving groove (35) recessed so as to be present.
The vehicle seat (1) according to at least some embodiments of the present invention includes a base member (2) supported by a vehicle body, a cushion frame (5) constituting a frame of the seat cushion (3), and the base. A link mechanism (6) that supports the cushion frame so as to be displaceable up and down with respect to a member, a drive mechanism (7) that drives the cushion frame in the vertical direction via the link mechanism, and the cushion frame upward. Extending between the left and right sides of the cushion frame and at the left and right first ends (17) and second ends (16b) to urge each other at the pivot of the link mechanism. A vehicle seat with the height-adjustable seat cushion having a torsion bar (14) coupled to a first portion (12) and a second portion (8) that rotate relative to each other. A shaft portion (15) extending in the left-right direction and an extension extending at least partially on the second end side in a direction intersecting the shaft portion and coupled to the second portion. The first portion has a portion (16), which non-rotatably supports the first end of the torsion bar, and the second end side of the shaft portion of the torsion bar is the shaft of the torsion bar. A through hole that is supported via a position holding member (24, 41) for suppressing the displacement of the core, the position holding member is rotatably supported with respect to the first portion, and the shaft portion is inserted therethrough. It is characterized by having a main body portion (25, 42) including (27) and an engaging portion (26, 43) that engages with the extension portion so as to rotate integrally.

According to this configuration, the position holding member does not rotate about the axis with respect to the torsion bar, but rotates with respect to the first portion, so that the position where the lateral force of the torsion bar is applied to the position holding member becomes constant. , It is sufficient for the position holding member to secure the strength to withstand the lateral force in a narrow angle range.

The vehicle seat according to at least some embodiments of the present invention has a connecting pipe (12) in which one of the cushion frame and the link mechanism is rotatable with respect to the other in the above configuration. The connecting pipe constitutes the first portion, and the main body portion of the position holding member has a cylindrical contour and is rotatably received in the inner hole (13) of the connecting pipe. It is characterized by.

According to this configuration, the first portion can have a simple structure.

In any of the above configurations, the vehicle seat according to at least some embodiments of the present invention has the engaging portion (26) of the position holding member (24) protruding from the main body portion (25). It has an engaging convex portion (30) and an engaging claw (29) that protrudes from the main body portion and cooperates with the engaging convex portion to elastically hold the extension portion, or said. The engaging portion (43) of the position holding member (41) is characterized by having a pair of engaging claws (44) protruding from the main body portion (42) and sandwiching the extension portion.

According to this configuration, the engaging portion can have a simple structure.

In the vehicle seat according to at least some embodiments of the present invention, in the above configuration, the engaging claw is locked so as to overhang the extension portion, and is above the engaging convex portion. It is characterized by being placed.

According to this configuration, the engaged state of the engaging portion can be easily confirmed.

The vehicle seat according to at least some embodiments of the present invention is characterized in that, in any of the above configurations, the engaging portion is located outside the second portion in the left-right direction. ..

According to this configuration, the engaged state of the engaging portion can be easily confirmed.

In any of the above configurations, the vehicle seat according to at least some embodiments of the present invention extends radially to the inner end face in the left-right direction so that the position-holding member can accept the extension. It has a receiving groove (35) recessed so as to exist, and is characterized by being made of an integrally molded product.

According to this configuration, when the torsion bar is inserted into the through hole of the position holding member and the position of the position holding member with respect to the torsion bar is shifted, the bent extension portion of the torsion bar is received by the receiving groove. The position of the holding member can be shifted. Therefore, both can be assembled by inserting the end portion of the torsion bar into the through hole of the position holding member of the integrally molded product and shifting the position holding member.

In the above configuration, the vehicle seat according to at least some embodiments of the present invention has the receiving groove in the circumferential direction with respect to the side where the lateral force received by the position holding member from the torsion bar is maximized. It is characterized in that it is provided at a displaced position.

According to this configuration, since there is no receiving groove at the position where the lateral force from the torsion bar is received, the strength of the position holding member can be ensured.

The vehicle seat according to at least some embodiments of the present invention is characterized in that, in the above configuration, the side where the lateral force received by the position holding member from the torsion bar is maximized is preferentially reinforced. do.

According to this configuration, since the part that receives the lateral force that requires strength is preferentially reinforced, the reinforcement of other parts that may have low strength is low, and the position holding member can be made smaller and lighter. can.

In any of the above configurations, the vehicle seat according to at least some embodiments of the present invention has a plurality of ribs (34) extending along the axial direction on the outer peripheral surface of the main body of the position holding member. Is provided.

According to this configuration, since the rib is in sliding contact with the connecting pipe which is the first portion, the frictional resistance when the position holding member slides with respect to the connecting pipe can be reduced.

In the vehicle seat according to at least some embodiments of the present invention, in the above configuration, the side peripheral wall of the main body portion is formed on the inner peripheral wall (31) defining the through hole and the first portion. It has an outer peripheral wall (32) that is rotatably supported, and a plurality of reinforcing walls (33) that extend radially and connect the inner peripheral wall and the outer peripheral wall, and at least a part of the reinforcing walls. Is provided at a position that coincides with the rib in the radial direction.

According to this configuration, since the position holding member has a lightening structure, the weight of the position holding member can be reduced, and the ribs and the reinforcing wall are aligned with each other in the radial direction, so that the torsion bar is efficiently reinforced against the lateral force. It becomes.

According to the present invention, the frictional resistance of the position holding member with respect to the connecting pipe can be reduced by providing the rib.
In a configuration in which the position holding member has an inner peripheral wall, an outer peripheral wall, and a reinforcing wall, the position holding member can be made lighter because it has a lightening structure. Further, when the reinforcing wall extends in the radial direction or is aligned with the rib, the reinforcement against the lateral force of the torsion bar becomes efficient.
In the configuration having a flange portion, the position of the position holding member in the left-right direction with respect to the connecting pipe is determined by the flange portion contacting the connecting pipe.
In the configuration in which the position holding member has a receiving groove, both can be assembled by inserting the end portion of the torsion bar into the through hole of the position holding member and shifting the position holding member.
In the configuration having an engaging portion, the position holding member does not rotate about the axis with respect to the torsion bar, but rotates with respect to the first portion. Therefore, the position where the lateral force of the torsion bar is applied to the position holding member is determined. It becomes constant, and the position holding member may secure the strength to withstand the lateral force in a narrow angle range.

In the configuration in which the first portion is composed of connecting pipes, a simple structure can be obtained.

A structure in which the engaging portion has an engaging claw can be a simple structure.

In the configuration in which the engaging claws overhang the extension portion, the engaged state of the engaging portion can be easily confirmed.

In the configuration in which the engaging portion is located outside the second portion in the left-right direction, the engaged state of the engaging portion can be easily confirmed.

In the configuration in which the position holding member has a receiving groove, both can be assembled by inserting the end portion of the torsion bar into the through hole of the position holding member and shifting the position holding member.

In a configuration in which the receiving groove is provided at a position shifted in the circumferential direction with respect to the side where the lateral force received from the torsion bar is maximized, there is no receiving groove at the position where the lateral force received from the torsion bar is received. The strength of the holding member can be ensured.

In the configuration in which the side where the position holding member receives the maximum lateral force from the torsion bar is preferentially reinforced, the portion receiving the lateral force that requires strength is preferentially reinforced, so that other strengths may be low. The reinforcement of the portion can be lowered, and the position holding member can be made smaller and lighter.

In a configuration in which a plurality of ribs extending along the axial direction are provided on the outer peripheral surface of the main body of the position holding member, the ribs are in sliding contact with the connecting pipe which is the first portion, so that the position holding member is attached to the connecting pipe. On the other hand, the frictional resistance when sliding can be reduced.

In a configuration in which the position-retaining member has an inner peripheral wall, an outer peripheral wall, and a reinforcing wall, and at least a part of the reinforcing walls is provided at a position that coincides with the rib in the radial direction, the position-retaining member is made lighter because it has a lightening structure. At the same time, since the ribs and the reinforcing wall are aligned with each other in the radial direction, the reinforcement against the lateral force of the torsion bar becomes efficient.

A perspective view showing a vehicle seat according to the first embodiment. Cross-sectional view of a horizontal plane showing the vicinity of the torsion bar of the vehicle seat according to the first embodiment. A perspective view showing a torsion bar and a position holding member according to the first embodiment. A perspective view showing a state in which the position holding member according to the first embodiment is assembled to the torsion bar. Perspective view which shows the position holding member which concerns on 1st Embodiment A perspective view showing the position holding member according to the first embodiment as viewed from another direction. A perspective view showing a state in which the position holding member according to the second embodiment is assembled to the torsion bar. Perspective view which shows the position holding member which concerns on 2nd Embodiment A perspective view showing the position holding member according to the second embodiment as viewed from another direction.

Hereinafter, the vehicle seat 1 according to the first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the vehicle seat 1 is installed in the driver's seat or the passenger seat of the vehicle, and has a pair of left and right base members 2 and 2 supported by the vehicle body and a pair of left and right base members. It includes a seat cushion 3 supported by 2 and 2, a seat back 4 connected to the seat cushion 3, and a headrest (not shown) connected to the seat back 4. The seat cushion 3 drives the cushion frame 5 in the vertical direction via a link mechanism 6 that supports the cushion frame 5 constituting the frame of the seat cushion 3 with respect to the base member 2 so as to be vertically displaceable, and the link mechanism 6. The position can be adjusted in the height direction by the drive mechanism 7. Further, it is preferable that the vehicle seat 1 is supported by the vehicle body via a rail (not shown) extending in the front-rear direction, and the position can be adjusted in the front-rear direction.

The cushion frame 5 has a pair of left and right side frames 8 and 8 and a front frame 9 connecting the pair of left and right side frames 8 and 8 on the front side.

The link mechanism 6 includes a pair of left and right base members 2 and 2 on the front side and a pair of left and right front links 10 and 10 connecting between a pair of left and right side frames 8 and 8, and a pair of left and right front links 10 and 10 on the rear side. It has a pair of base members 2, 2 and a pair of left and right rear links 11, 11 connecting between a pair of left and right side frames 8, 8, and each link 10, 10, 11, 11 has a corresponding base member. It is pivotally supported about the left and right directions with respect to the 2 and the side frame 8. In the pair of left and right rear links 11 and 11, the rotation axes of the left pivot and the corresponding right pivot are coaxial.

The link mechanism 6 further includes a connecting pipe 12 extending in the left-right direction and having both left and right ends fixed to corresponding rear links 11. As shown in FIGS. 1 and 2, the central axis of the connecting pipe 12 is coaxial with the rotation axis of the pair of left and right side frames 8 and 8 and the pair of left and right rear links 11, and is fixed to the rear link 11. The end portion 12b of the connecting pipe 12 is rotatably supported by the side frame 8, so that the pair of left and right rear links 11 and 11 and the connecting pipe 12 are integrated, and the pair of left and right side frames 8 are integrated. , 8 can be rotated around the left-right direction. The left and right end portions 12b and 12b of the connecting pipe 12 constituting the pivot portion are separate from the main body portion 12a so that the shape does not change even if the main body portion 12a is processed. It is joined to the left and right ends of the pipe by welding.

The torsion bar 14 inserted into the inner hole 13 of the connecting pipe 12 is formed by bending both ends of one steel rod having a circular cross section. As shown in FIG. 3, the torsion bar 14 includes a shaft portion 15 extending in the left-right direction, a first extension portion 16a extending from the right end of the shaft portion 15 so as to be orthogonal to the shaft portion 15, and a first extension. The extension portion 16 having the second extension portion 16b extending from the tip of the portion 16a to the left in parallel with the shaft portion 15 and the end portion on the left end side of the steel rod are folded back so as to easily regulate the rotation around the axis. It has a folded-back portion 17 formed by the above.

As shown in FIG. 2, the extension portion 16 is located outside the inner hole 13 of the connecting pipe 12. The second extension portion 16b is located in front of the shaft portion 15 and engages with the engagement hole 18 provided in the side frame 8 on the right side. On the upper surface of the second extension portion 16b, the second extension portion 16b engages with a portion defining the engagement hole 18 of the side frame 8 in order to prevent the second extension portion 16b from coming out to the right from the engagement hole 18. An engaging groove 19 is provided. Since the extension portion 16 engages with the right side frame 8 on the right end side of the torsion bar 14, rotation around the axis with respect to the right side frame 8 is restricted.

On the left end side of the main body portion 12a of the connecting pipe 12, a pipe crushing portion 20 formed by denting the main body portion 12a from the front and rear so as to narrow the inner hole 13 is provided. Since the folded-back portion 17 of the torsion bar 14 is sandwiched by the pipe crushing portion 20 in the inner hole 13, the left end side of the torsion bar 14 is restricted from rotating about the axis with respect to the connecting pipe 12.

The torsion bar 14 is locked to the right side frame 8 and the pipe crushing portion 20 in a twisted state. When the cushion frame 5 is moved up and down, the angle formed by the right side frame 8 and the pair of left and right rear links 11 and 11 and the connecting pipe 12 changes. At the same time, the helix angle of the torsion bar 14 engaged with the connecting pipe 12 changes on the left end side. Since the torsion bar 14 is installed so that the helix angle of the torsion bar 14 increases when the cushion frame 5 is lowered and the helix angle of the torsion bar 14 decreases when the cushion frame 5 is raised, the torsion bar 14 The urging force generated by the twist acts in the direction of raising the cushion frame 5.

The drive mechanism 7 has an electric motor 21 fixed to the left side frame 8, a pinion 22 rotated by the rotation of the electric motor 21, and a gear 23 fixed to the rear link 11 on the left side and meshed with the pinion 22. The electric motor 21 drives the cushion frame 5 in the vertical direction via the pinion 22, the gear 23, and the rear link 11 on the left side. At this time, the rear link 11 on the right side is interlocked with the rear link 11 on the left side by the connecting pipe 12, and the pair of left and right front links 10 and 10 have the pair of left and right side frames 8 and 8 and the front frame 9 mutually. Since it is rigidly connected, it works with a pair of left and right rear links 11 and 11. Instead of the electric motor 21, the cushion frame 5 may be manually driven.

As shown in FIGS. 1 and 2, in order to align the axis of the torsion bar 14 with the central axis of the connecting pipe 12 and maintain that state, the right end side of the connecting pipe 12 and the shaft portion 15 of the torsion bar 14 are maintained. A position holding member 24 is attached to the right end side of the.

As shown in FIGS. 3 to 6, the position holding member 24 holds the shaft portion 15 of the torsion bar 14 and engages with the main body portion 25 attached to the connecting pipe 12 and the first extension portion 16a of the torsion bar 14. It is an integrally molded product having an engaging portion 26.

The main body 25 has a cylindrical contour in which a through hole 27 is formed along the left-right direction. The shaft portion 15 of the torsion bar 14 is inserted through the through hole 27 and gripped, and the cylindrical outer peripheral surface of the main body portion 25 comes into contact with the inner peripheral surface of the inner hole 13 of the connecting pipe 12, so that the torsion bar 14 is held. The position of the shaft core of the shaft portion 15 of the above is maintained. If the position of the shaft core of the shaft portion 15 deviates from the connecting pipe 12, the urging force of the torsion bar 14 deviates from the design value, but this deviation can be prevented by the position holding member 24. A flange portion 28 extending radially from the side peripheral surface is provided at the right end of the main body portion 25, and the left surface of the collar portion 28 abuts on the right end of the connecting pipe 12, so that the connecting pipe 12 of the position holding member 24 The position in the left-right direction with respect to is determined (see FIG. 2).

As shown in FIG. 5, the engaging portion 26 has engaging claws 29 and engaging convex portions 30 that are provided on the right end surface of the main body portion 25 and face each other. The free end side of the engaging claw 29 is bent toward the engaging convex portion 30 side so as to overhang the first extension portion 16a (see FIG. 3), and engages with the right end surface of the main body portion 25. The distance between the facing surfaces of the joint claw 29 with the free end side is substantially equal to the diameter of the first extension portion 16a of the torsion bar 14. Ribs 29a for strengthening the engaging claws 29 are provided along both side edges on the surface of the engaging claw 29 opposite to the side facing the first extension portion 16a. The top of the engaging convex portion 30 does not protrude from the main body 25 from the free end of the engaging claw 29, and the distance between the top of the engaging convex portion 30 and the free end of the engaging claw 29 is usually the first. Although it is smaller than the diameter of the 1 extension portion 16a, the first extension portion 16a can pass between the top of the engaging convex portion 30 and the free end of the engaging claw 29 due to the elastic deformation of the engaging claw 29. .. After assembly, the engaging claw 29 is arranged above the engaging convex portion 30, and / or the engaging portion 26 is configured to be located outside the side frame 8 in the left-right direction. It becomes easier to check the compatibility status.

The engaging convex portion 30 has a triangular shape when viewed from the radial direction, and is provided on a guide surface 30a that separates from the main body portion 25 as it approaches the engaging claw 29 and a side closer to the engaging claw 29 than the guide surface 30a. Therefore, it has a locking surface 30b that approaches the main body 25 as it approaches the engaging claw 29. The guide surface 30a guides the first extension portion 16a when the position holding member 24 is assembled to the torsion bar 14, and the locking surface 30b is on the right side of the engaging claw 29 and the main body portion 25 in the state where both are assembled. The first extension portion 16a is gripped in cooperation with the end face. Since the angle of the locking surface 30b with respect to the right end surface of the main body 25 is steeper than the angle of the guide surface 30a with respect to the right end surface of the main body 25, the engagement between the position holding member 24 and the first extension 16a When the position holding member 24 is rotated in the reverse direction in order to release the above, a larger force is required than when the position holding member 24 is rotated in order to engage the two. The engaging portion 26 may be formed by a recess (not shown) provided in the main body portion 25 instead of the engaging claw 29 and the engaging convex portion 30, and the combination of the engaging claw 29 and the concave portion may be formed. It may be configured by.

As shown in FIG. 6, the cylindrical main body 25 of the position holding member 24 is lightened to have a two-layer structure, and the inner peripheral wall 31 defining the through hole 27 and the inner hole of the connecting pipe 12 are formed. An outer peripheral wall 32 that is slidably contacted with an inner peripheral surface defining 13 and is rotatably supported by a connecting pipe 12, and a plurality of reinforcing walls 33 that extend in the radial direction and connect between the inner peripheral wall 31 and the outer peripheral wall 32. And have. In order to reduce the frictional resistance when the position holding member 24 rotates about the axis with respect to the connecting pipe 12, a plurality of ribs 34 are provided on the outer peripheral surface of the outer peripheral wall 32 along the axial direction, and the ribs 34 are connected pipes. It is in sliding contact with the inner peripheral surface of 12. The plurality of ribs 34 are arranged at substantially equal intervals in the circumferential direction over a predetermined range on the side receiving the lateral force from the torsion bar 14. The plurality of reinforcing walls 33 are arranged at substantially equal intervals in the circumferential direction, and the reinforcing walls 33 located on the side where the ribs 34 are provided are aligned with the ribs 34 in the radial direction, so that the lateral force from the torsion bar 14 is obtained. Reinforcement against is efficient .

The inner peripheral wall 31 and the outer peripheral wall 32 of the position holding member 24 each have an inner receiving groove 35a and an outer receiving groove 35b recessed so as to extend in the radial direction on the left end surface. The inner receiving groove 35a and the outer receiving groove 35b are provided at positions on the opposite side of the rib 34 in the circumferential direction and aligned with each other in the radial direction. The circumferential width of the inner receiving groove 35a and the outer receiving groove 35b is substantially equal to the diameter of the torsion bar 14. When the position holding member 24 is assembled to the torsion bar 14, the inner receiving groove 35a and the outer side are received so that the receiving groove 35 composed of the inner receiving groove 35a and the outer receiving groove 35b can receive the extension portion 16 of the torsion bar 14. The depth of the receiving groove 35b in the left-right direction is set. The receiving groove 35 is provided at a position displaced by about 90 ° in the circumferential direction with respect to the engaging portion 26. The angle of the position of the receiving groove 35 with respect to the engaging portion 26 can be changed as long as the two are displaced from each other in the circumferential direction. Further, since the strength is low in the vicinity of the receiving groove 35, the receiving groove 35 is displaced in the circumferential direction with respect to the side where the lateral force received from the torsion bar 14 by the position holding member 24 is maximized, for example, a diagonal position. It is provided in.

The assembly method and the action and effect will be described. The worker inserts the free end of the second extension portion 16b of the torsion bar 14 into the through hole 27 from the left end side of the position holding member 24, and moves the position holding member 24 to the right end side of the shaft portion 15. At this time, since the position holding member 24 has the receiving groove 35, the position holding member 24 can pass through the extension portion 16 bent with respect to the shaft portion 15.

Next, the worker rotates the position holding member 24 about the axis with respect to the shaft portion 15 of the torsion bar 14. At this time, the first extension portion 16a is arranged between the engaging claw 29 and the engaging convex portion 30 after elastically deforming the engaging claw 29 while sliding the guide surface 30a of the engaging convex portion 30. .. The engaging claw 29 elastically holds the first extension portion 16a in cooperation with the engaging convex portion 30.

After that, the worker inserts the torsion bar 14 to which the position holding member 24 is attached into the inner hole 13 of the connecting pipe 12, and inserts the folded-back portion 17 and the second extension portion 16b of the torsion bar 14 into the pipe crushing portion 20, respectively. And engage with the right side frame 8.

Since the receiving groove 35 is provided, even if the torsion bar 14 is bent, the position holding member 24 can be inserted from the end thereof and moved to a predetermined position, so that the assembly is easy and the position holding member is easy to assemble. The number of parts can be reduced by making 24 an integrally molded product.

When the engaging portion 26 engages the first extension portion 16a, the rotation of the position holding member 24 with respect to the torsion bar 14 and the displacement in the left-right direction are described, and the position and posture of the position holding member 24 are stabilized. Therefore, even if the position holding member 24 is shipped in a state of being assembled to the torsion bar 14, there is little risk that the position holding member 24 will come off or be damaged.

When the engaging portion 26 engages with the first extension portion 16a, the position holding member 24 rotates with respect to the connecting pipe 12 together with the right end side of the shaft portion 15 of the torsion bar 14. Therefore, the position where the lateral force of the torsion bar 14 is applied to the position holding member 24 is constant, and it is sufficient for the position holding member 24 to secure the strength to withstand the lateral force in a narrow angle range. Therefore, the position holding member 24 can be made smaller and lighter, and the receiving groove 35 can be provided in a portion where the influence of the lateral force is small.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 9. In addition, in the description, the description is omitted and the same reference numerals are given to the configurations common to those of the first embodiment. In the second embodiment, the shape and the assembling method of the position holding member 41 are different from those in the first embodiment.

The position holding member 41 according to the second embodiment holds the shaft portion 15 of the torsion bar 14 and engages with the main body portion 42 attached to the connecting pipe 12 and the first extension portion 16a of the torsion bar 14. It is an integrally molded product having 43.

Similar to the first embodiment, the main body portion 42 has a cylindrical shape having through holes 27 along the left-right direction, and has an inner peripheral wall 31, an outer peripheral wall 32, and a reinforcing wall 33. It should be noted that there is no configuration corresponding to the rib 34 of the first embodiment.

As shown in FIG. 8, the engaging portion 43 has a pair of engaging claws 44, 44 facing each other provided on the right end surface of the main body portion 42. The pair of engaging claws 44, 44 are mirror image symmetrical to each other. Each engaging claw 44 is along both side edges of an engaging piece 45 that engages the extension 16 of the torsion bar 14 and a surface of the engaging piece 45 that is opposite to the side facing the first extension 16a. It has a rib 46 for strengthening the strength provided therein. The flange portion 47 extending in the radial direction from the side peripheral surface at the right end of the main body portion 42 extends to a position where the rib 46 should be provided to support the rib 46.

The protrusion length of the engaging piece 45 to the right is longer than the radius of the first extension portion 16a, and is preferably equal to or larger than the diameter of the first extension portion 16a. On the side of the engaging piece 45 facing the first extension portion 16a, a portion protruding from the main body portion 25 with respect to the radius of the first extension portion 16a extends along the extending direction of the first extension portion 16a. The existing radius 48 is provided. The distance between the pair of engaging pieces 45, 45 is approximately equal to the diameter of the first extension 16a. Further, the distance between the pair of ridges 48, 48 is narrower than the diameter of the first extension portion 16a, and the tip of each ridge 48 presses against the first extension portion 16a. Therefore, the pair of engaging claws 44, 44 elastically holds the first extension portion 16a.

The assembly method and the action and effect will be described. The worker inserts the free end of the second extension portion 16b of the torsion bar 14 into the through hole 27 from the left end side of the position holding member 41, and moves the position holding member 41 to the right end side of the shaft portion 15. At this time, the position holding member 41 is positioned to the left of the original position holding member 41 in the left-right direction by the same degree or more as the protrusion length to the right of the engaging claw 44. Since the position holding member 41 has the receiving groove 35 as in the first embodiment, the position holding member 41 can pass through the extension portion 16 bent with respect to the shaft portion 15.

Next, the worker rotates the position holding member 41 about the axis with respect to the shaft portion 15 of the torsion bar 14, and creates a gap between the pair of engaging claws 44, 44 with respect to the first extension portion 16a of the torsion bar 14. After aligning in the left-right direction, the position holding member 41 is moved to the right. At this time, the pair of ridges 48 are pushed out to the first extension portion 16a so as to be separated from each other, and the pair of engaging claws 44, 44 are elastically deformed, so that the first extension portion 16a becomes a pair. It passes between the engaging claws 44 and 44. When the central axis of the first extension portion 16a passes between the pair of ridges 48, 48, the elastic deformation of the pair of engaging claws 44, 44 partially returns, so that the pair of engaging claws 44, 44 elastically holds the first extension portion 16a.

After that, as in the first embodiment, the worker inserts the torsion bar 14 to which the position holding member 41 is attached into the inner hole 13 of the connecting pipe 12, and the folded portion 17 and the second extension portion 16b of the torsion bar 14 are inserted. Are engaged with the pipe crushing portion 20 and the right side frame 8, respectively.

Even if the position holding member 41 is an integrally molded product, it is easy to assemble to the bent torsion bar 14 because the receiving groove 35 is provided, as in the first embodiment.

When the engaging portion 43 engages the first extension portion 16a, the position holding member 41 does not rotate about the axis because it is locked by the pair of engaging pieces 45, 45 with respect to the torsion bar 14. Since it is locked to the pair of ridges 48, 48 and the right surface of the main body 42, the displacement in the left-right direction is restricted. Therefore, even if the position holding member 24 is shipped in a state of being assembled to the torsion bar 14, there is little risk that the position holding member 24 will come off or be damaged.

As in the first embodiment, when the engaging portion 43 engages with the first extension portion 16a, the position holding member 41 rotates with respect to the connecting pipe 12 together with the right end side of the shaft portion 15 of the torsion bar 14. do. Therefore, the position where the lateral force of the torsion bar 14 is applied to the position holding member 41 is constant, and it is sufficient for the position holding member 41 to secure the strength to withstand the lateral force in a narrow angle range. Therefore, the position holding member 41 can be made smaller and lighter, and the receiving groove 35 can be provided in a portion that does not receive the lateral force.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment. In the above embodiment, the left and right sides may be reversed. The connecting pipe may be pivotally supported by a pair of left and right rear links as a part of the cushion frame, and the extension portion of the torsion bar may be engaged with the rear links. The connecting pipe and torsion bar are provided coaxially with the base member, the rear link and the pivot part, the connecting pipe is fixed to one of the base member and the rear link, and the extension portion of the torsion bar is engaged with the other of the base member and the rear link. You may let me. Regarding the shape of the connecting pipe, the portion that receives the position holding member may have a circular inner peripheral surface, and the other portion may have a square tube shape or a rod shape. Instead of the rear link, a connecting pipe and a torsion bar may be attached to the front link.

1: Vehicle seat 2: Base member 3: Seat cushion 5: Cushion frame 6: Link mechanism 7: Drive mechanism 8: Side frame (second part)
11: Rear link 12: Connecting pipe (first part)
13: Inner hole 14: Torsion bar 15: Shaft part 16: Extension part 24, 41: Position holding member 25, 42: Main body part 26: Engagement part 27: Through hole 29, 44: Engagement claw 30: Engagement convex Part 31: Inner side wall 32: Outer wall 33: Reinforcing wall 34: Rib (protruding part)
35: Receptive groove

Claims (8)

The base member supported by the car body and
The cushion frame that makes up the seat cushion frame and
A link mechanism that supports the cushion frame in a vertically displaceable manner with respect to the base member,
A drive mechanism that drives the cushion frame in the vertical direction via the link mechanism, and
In order to urge the cushion frame upward, it extends between the left and right side portions of the cushion frame, and at the left and right first and second ends, each other at the pivot portion of the link mechanism. A vehicle seat with the height-adjustable seat cushion with a first portion that rotates relative to each other and a torsion bar coupled to the second portion.
A shaft portion extending in the left-right direction and an extension portion extending at least partially on the second end side in a direction in which the torsion bar intersects the shaft portion and coupled to the second portion. Have,
The first portion non-rotatably supports the first end of the torsion bar, and the second end side of the shaft portion of the torsion bar is used to suppress displacement of the shaft core of the torsion bar. Supported via a position holding member,
One of the cushion frame and the link mechanism has a connecting member that is rotatable with respect to the other.
The connecting member constitutes the first portion,
The position-holding member has a main body portion having a side peripheral wall including a tubular contour, and the main body portion is received by an inner hole of the connecting member.
A vehicle seat characterized in that a protruding portion is provided on the outer peripheral surface of the main body portion of the position holding member. The main body portion includes a through hole through which the shaft portion is inserted.
The side peripheral wall is characterized by having an inner peripheral wall defining the through hole, an outer peripheral wall supported by the first portion, and a plurality of reinforcing walls connecting the inner peripheral wall and the outer peripheral wall. The vehicle seat according to claim 1. The vehicle seat according to claim 2, wherein the reinforcing wall extends in the radial direction. The vehicle seat according to claim 3, wherein the reinforcing wall aligns with the protruding portion in the radial direction. A plurality of the protrusions are provided so as to extend along the axial direction.
The method according to any one of claims 1 to 4, wherein the length of at least one of the protrusions in the circumferential direction is shorter than the distance in the circumferential direction between the two protrusions adjacent to each other in the circumferential direction. Vehicle seats. The main body portion has a collar portion extending outward in the radial direction from the outer peripheral surface.
The vehicle seat according to any one of claims 1 to 5, wherein the protruding portion is continuous with the flange portion. For the outer peripheral surface, the projecting length in the radial direction of the protrusion, a vehicle seat according to claim 6, characterized in that less than extending length in the radial direction of the flange portion. Any of claims 1 to 7, wherein the position-holding member has a receiving groove recessed so as to extend in the radial direction so as to be able to receive the extension portion on the inner end surface in the left-right direction. The vehicle seat described in paragraph 1.

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