JP5865228B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat provided with a pipe member.

  Some vehicle seats include a seat suspension using an X-type link that connects a seat cushion and a vehicle body floor (see, for example, Patent Document 1 below).

  This X-type link includes a movable shaft movably connected to a pair of frames arranged side by side in the vertical direction, and a fixed shaft (pipe member) movably connected to the pair of frames. It is configured. Then, when the movable shaft is moved along the frame, the X-type link is rotated, and the frame arranged on the upper side is relatively moved in the vertical direction with respect to the frame arranged on the lower side. ing.

  By the way, this fixed shaft is formed in a pipe shape, and bushes are fitted (press-fit) at both ends in the longitudinal direction of the fixed shaft. A core shaft is inserted into the bush, and the core shaft is fixed to the frame. As a result, the fixed shaft is connected to the core shaft and the frame via the bush and is immovable with respect to the frame.

Japanese Utility Model Publication No. 7-27938

  However, when the fixed shaft is formed in a pipe shape by welding the end portions in the circumferential direction, a welded bead (so-called weld bead) is formed on the side surface of the fixed shaft. As a result, when the bush is press-fitted into the fixed shaft on which the weld bead is formed, the bush comes into contact (pressing) with the weld bead, so that the bush breaks and the inner diameter of the bush is reduced and the core shaft is inserted into the bush. There is a problem that you can not.

  Therefore, in general, a machined weld bead, a pipe previously formed into a pipe shape, or the like drawn to a predetermined diameter is used as the fixed shaft. Thereby, there existed a problem of causing a cost increase in a vehicle seat.

  An object of the present invention is to provide a vehicle seat in which a bush can be press-fitted well into a welded pipe member in consideration of the above facts.

The vehicle seat according to claim 1 constitutes a skeleton of the vehicle seat, and is inserted into the pipe member formed into a pipe shape having a welded portion between circumferential end portions , and the pipe member. A bush for connecting the pipe member to another skeleton member for the vehicle seat, a part of the bush, and a cylindrical shape arranged coaxially with the pipe member, the diameter of the pipe member A cylindrical portion that is spaced apart in the direction, and is formed integrally with the cylindrical portion, protrudes in the radial direction of the cylindrical portion from an outer peripheral surface or an inner peripheral surface of the cylindrical portion, and an axis of the cylindrical portion A contact portion that is formed in a rib shape extending from a middle portion in the direction to the opposite side to the insertion direction of the bush, and that contacts the pipe member in a state where the bush is inserted into the pipe member.

In the vehicle seat according to the first aspect, the pipe member constituting the skeleton of the vehicle seat is formed in a pipe shape. The pipe member is formed in a pipe shape having a welded portion between end portions in the circumferential direction. Therefore, the side surface of the pipe member, the weld (so-called weld bead) is Ru Tei is formed along the longitudinal direction of the pipe member. And a bush is inserted in a pipe member and a pipe member is connected with other frame members of a vehicular seat via a bush.

  Here, a part of the bush is composed of a cylindrical portion formed in a cylindrical shape, and the cylindrical portion is arranged coaxially with the pipe member and spaced apart in the radial direction of the pipe member. That is, the cylinder part is arrange | positioned in the radial direction inner side or radial direction outer side of a pipe member.

Moreover, the contact part is integrally formed in the cylinder part. The contact portion protrudes from the outer peripheral surface or inner peripheral surface of the cylindrical portion in the radial direction of the cylindrical portion, and the contact portion is in contact with the pipe member in a state where the bush is inserted into the pipe member.

For this reason, when a cylinder part is arrange | positioned at the radial inside of a pipe member, a contact part is formed in a pipe by projecting a contact part from the outer peripheral surface of a cylinder part to the radial direction outer side of a cylinder part. It contacts the inner peripheral surface of the member. On the other hand, when the cylindrical portion is disposed on the radially outer side of the pipe member, the contact portion is formed so as to protrude from the inner peripheral surface of the cylindrical portion to the radially inner side of the cylindrical portion. It contacts the outer peripheral surface of the member. As a result, a gap (space) is formed between the pipe portion and the cylindrical portion where no contact portion is formed. On the other hand, the bush can be inserted into the pipe member without the influence of the weld bead. Therefore, the bush can be press-fitted well into the welded pipe member without cutting the weld bead of the pipe member.
Further, the contact portion is formed in a rib shape and extends from the intermediate portion in the axial direction of the cylindrical portion to the opposite side to the bushing insertion direction. For this reason, the contact part is not formed in the edge part by the side of the insertion direction in a bush. Accordingly, when the bush is inserted into the pipe member or when the pipe member is inserted into the bush, interference between the weld bead of the pipe member and the contact portion of the bush is suppressed. As a result, the assembling property of the bush to the pipe member can be improved.

  The vehicle seat according to a second aspect is the vehicle seat according to the first aspect, wherein the contact portion is formed at three or more locations in the circumferential direction of the cylindrical portion.

In the vehicle seat according to claim 2, since the contact portions are formed at three or more locations in the circumferential direction of the cylindrical portion, when the bush is inserted into the pipe member, the pipe is at least at three contact portions. The member is supported by the bush. For this reason, for example, the axial misalignment of the bush with respect to the pipe member is suppressed, and the bush can be stably press-fitted into the pipe member.

For example, when four or more contact portions are formed, even if the contact portion is temporarily crushed by the weld bead when the bush is inserted into the pipe member, the bush is piped at three or more contact portion portions. Supported by the member. For this reason, also in this case, for example, the axial misalignment of the bush with respect to the pipe member is suppressed, and the bush can be stably press-fitted into the pipe member.

The vehicle seat according to claim 3 is the vehicle seat according to claim 1 or 2, wherein the contact portion is formed in an arc shape in a cross-sectional view as viewed from the axial direction of the cylindrical portion, An end of the contact portion on the insertion direction side of the bush is inclined toward the tube portion as it goes in the insertion direction of the bush in a side view.

In the vehicle seat according to claim 3, the cross-sectional shape of the contact portion viewed from the axial direction of the cylindrical portion is formed in an arc shape, and an end portion of the contact portion on the insertion direction side of the bush is a bush in a side view. As it goes in the direction of insertion, it is inclined toward the tube side. For this reason, after inserting the bush into the pipe member or after inserting the pipe member into the bush, the bush can be temporarily press-fitted into the pipe member at the end of the contact portion on the insertion direction side of the bush. As a result, when the bush is fully press-fitted into the pipe member, the bush is supported in a state of being temporarily press-fitted into the pipe member, so that the assembling property of the bush to the pipe member can be further improved.

According to the vehicle seat of the first aspect , the bush can be press-fitted satisfactorily into the welded pipe member, and the assembly of the bush to the pipe member can be improved.

  According to the vehicle seat of the second aspect, the bush can be stably press-fitted into the pipe member.

According to the vehicle seat of the third aspect , the assembling property of the bush to the pipe member can be further improved.

It is sectional drawing which looked at the state by which the bush used for the vehicle seat which concerns on embodiment of this invention was press-fitted in the welding pipe from the sheet | seat width direction inner side. FIG. 2 is a side sectional view corresponding to FIG. 1 (a sectional view taken along line 2-2 in FIG. 1). It is a front view of the bush shown by FIG. FIG. 4 is a side view of the bush shown in FIG. 3. It is the side view seen from the sheet left side which shows the lower part of the vehicular seat concerning an embodiment of the invention. FIG. 6 is a perspective view showing a state in which the link unit shown in FIG. 5 is partially disassembled. It is the schematic sectional view seen from the seat front side which shows the parallel link mechanism used for the vehicle seat which concerns on embodiment of this invention.

  FIG. 5 is a side view of the lower part of the vehicle seat 10 according to the embodiment of the present invention as viewed from the left side of the seat. Note that an arrow FR appropriately shown in the drawings indicates the front of the seat, an arrow UP indicates the upper portion of the seat, and an arrow RH indicates the right side of the seat (one side in the seat width direction).

  As shown in this figure, the vehicle seat 10 includes a cushion frame 12 that constitutes a skeleton of a seat cushion (not shown) on which an occupant sits. The cushion frame 12 includes a conventionally known X-link mechanism 14 ( In a broad sense, it is connected to the vehicle body floor by an element grasped as a “connection mechanism”. Thereby, both the cushion frame 12 and the X link mechanism 14 constitute a skeleton of the vehicle seat 10. Further, a support member (not shown) configured by a compression spring or the like is provided below the seat of the cushion frame 12, and the cushion frame 12 is elastically supported in the seat vertical direction by this support member.

  The X link mechanism 14 includes a pair of lower rails 16, a pair of upper rails 18, and a pair of link units 20. The lower rail 16 extends in the front-rear direction of the seat and is arranged side by side in the seat width direction. In FIG. 5, only the lower rail 16 arranged on the left side of the seat is shown. The lower rail 16 has a substantially U-shaped cross section that is opened inward in the seat width direction (directions facing each other), and is fixed to the vehicle body floor by a pair of brackets 22.

  The upper rails 18 are respectively disposed above the seat of the lower rail 16 (only the upper rail 18 disposed on the left side of the seat is shown in FIG. 5), extend in the vehicle front-rear direction, and are arranged side by side in the seat width direction. Yes. The upper rail 18 has a substantially U-shaped cross section that is open to the inside in the seat width direction (directions facing each other), and is fixed to the cushion frame 12 via a pair of brackets 24.

  As shown in FIG. 6, the link unit 20 includes a pair of link members 26. A substantially pipe-like movable side pipe 28 is stretched across the front end portion of the link member 26 in the sheet width direction, and substantially cylindrical rollers 30 (see FIG. 5) at both longitudinal ends of the movable side pipe 28. Is assembled in a rotatable manner.

  In addition, a welding pipe 32 as a substantially pipe-shaped “pipe member” is bridged along the sheet width direction at the rear end portion of the link member 26. In the welded pipe 32, a pipe-shaped steel plate having a part of the side surface opened is used, and the open part of the steel plate is joined by welding. Thereby, a weld bead 33 formed by this welding is formed on the inner peripheral surface of the weld pipe 32 along the longitudinal direction of the weld pipe 32.

  Further, substantially cylindrical bushes 40 to be described later are press-fitted into both ends in the longitudinal direction of the weld pipe 32, and a substantially round bar-shaped fixed shaft 34 is inserted into the bushes 40. A fixed flange 36 is formed at one longitudinal end of the fixed shaft 34, and a screw portion 38 is formed at the other longitudinal end of the fixed shaft 34.

  The pair of link units 20 are disposed between the pair of lower rails 16 and the pair of upper rails 18, and are disposed between the link members 26 disposed on the left side of the seat and the right side of the pair of link units 20. The link members 26 are connected to each other so as to be rotatable in a state of intersecting in a substantially X shape in a side view.

  Further, the rollers 30 assembled to the movable side pipe 28 in the pair of link units 20 are respectively disposed in the lower rail 16 and the upper rail 18, whereby the seat front side end portion of the link member 26 is arranged at the lower rail. 16 and the upper rail 18 are configured to be movable.

  Further, the fixed shafts 34 in the pair of link units 20 are respectively penetrated through the lower rail 16 and the upper rail 18, and nuts (not shown) are screwed into the screw portions 38 of the fixed shaft 34, so that the fixed shaft 34 is connected to the lower rail 16. And fixed to the upper rail 18. Thereby, the seat rear side end portion of the link member 26 is configured to be immovable with respect to the lower rail 16 and the upper rail 18.

  Next, the bush 40 which is the main part of the present invention will be described with reference to FIGS.

  The bush 40 has a cylindrical portion 42 formed in a cylindrical shape. The outer diameter dimension of the cylindrical portion 42 is set to be smaller than the inner diameter dimension of the welded pipe 32, and the cylindrical portion 42 is coaxial with the welded pipe 32 at the positions at both ends in the longitudinal direction of the welded pipe 32. Has been placed. The inner diameter dimension of the cylindrical portion 42 is slightly larger than the outer diameter dimension of the fixed shaft 34 described above, and the fixed shaft 34 is rotatably inserted into the cylindrical portion 42.

  A flange portion 44 is integrally formed at the outer end of the cylindrical portion 42 in the sheet width direction. The flange portion 44 is formed in a substantially annular shape, and protrudes from the cylindrical portion 42 to the radially outer side of the cylindrical portion 42. And the flange part 44 is contact | abutted to the longitudinal direction both ends of the welding pipe 32, and the movement to the inner side of the sheet | seat width direction of the bush 40 is restrict | limited.

  In addition, a plurality of (four in this embodiment) press-fit ribs 46 as “contact portions” are integrally formed on the outer periphery of the tube portion 42, and the press-fit ribs 46 are formed in the circumferential direction of the tube portion 42. Arranged at equal intervals. The press-fitting rib 46 protrudes from the cylindrical portion 42 to the outer side in the radial direction of the cylindrical portion 42, and extends from the axially intermediate portion of the cylindrical portion 42 to the flange portion 44 along the axial direction of the cylindrical portion 42. That is, the press-fitting rib 46 is not formed on the outer peripheral portion of the cylindrical portion 42 at the inner end in the seat width direction. Further, the outer peripheral surface of the press-fitting rib 46 is curved in an arc shape when viewed from the axial direction of the cylindrical portion 42, and the diameter dimension of the circle in contact with the outer peripheral surfaces of the four press-fitting ribs 46 is the inner diameter dimension of the welded pipe 32. It is set larger than that. Thereby, the press-fitting rib 46 comes into contact with the inner peripheral surface of the weld pipe 32, and the bush 40 is press-fitted into the weld pipe 32. Therefore, a gap G (see FIG. 1) is formed between the outer peripheral surface of the cylindrical portion 42 and the inner peripheral surface of the welded pipe 32 at a portion where the press-fitting rib 46 is not formed.

  Further, a temporary press-fit portion 48 is formed at each end of each press-fit rib 46 on the inner side in the sheet width direction (the side opposite to the flange portion 44). The temporary press-fit portion 48 is formed in a substantially semi-conical shape that tapers toward the inside in the sheet width direction. That is, the temporary press-fit portion 48 is inclined toward the cylindrical portion 42 side (inward in the radial direction of the cylindrical portion 42) as it goes inward in the seat width direction as viewed from the side.

  In a state where the bush 40 is press-fitted into the weld pipe 32, the weld bead 33 of the weld pipe 32 is disposed in the gap G between the cylindrical portion 42 of the bush 40 and the weld pipe 32.

  The temporary press-fit portions 48 (end portions on the inner side in the sheet width direction) of the press-fit ribs 46 described above are disposed between the inner end in the sheet width direction of the cylindrical portion 42 and the flange portion 44, and the shaft of the bush 40 The length of each press-fitting rib 46 in the direction is set by a set value of the extraction force of the bush 40 pressed into the weld pipe 32 with respect to the weld pipe 32. As a result, the “intermediate portion in the axial direction of the cylindrical portion” in the present invention is spaced a predetermined distance from the inner end in the sheet width direction of the cylindrical portion 42 between the inner end in the sheet width direction of the cylindrical portion 42 and the flange portion 44. Refers to the part.

  Next, the operation and effect of the present embodiment will be described while explaining the procedure for assembling (press-fitting) the bush 40 to the welded pipe 32.

  When the bush 40 is assembled (press-fitted) into the weld pipe 32, the bush 40 is inserted into the weld pipe 32 from the outside in the seat width direction. At this time, the press-fit rib 46 is interfered with the weld bead 33 of the weld pipe 32 because the press-fit rib 46 is not formed on the outer peripheral portion of the cylindrical portion 42 of the bush 40 at the inner end in the seat width direction. It is inserted without it.

  When the bush 40 is inserted into the welded pipe 32, the edges at both ends in the longitudinal direction of the welded pipe 32 are brought into contact with the temporary press-fit portion 48 of the bush 40. When the bush 40 is further inserted inward in the sheet width direction from this state, both longitudinal ends of the weld pipe 32 press the temporary press-fit portions 48 of the bush 40 so that the bush 40 is temporarily press-fitted into the weld pipe 32. Become. Thereby, the bush 40 is supported by the welding pipe 32.

  When the bush 40 is temporarily press-fitted into the weld pipe 32, for example, when the weld pipe 32 is set in a press-fitting machine (not shown) and the bush 40 is press-fitted into the weld pipe 32 by the press-fitting machine, the bush 40 is press-fitted. The ribs 46 are brought into contact with the inner peripheral surface of the weld pipe 32, and the bush 40 is press-fitted into the weld pipe 32. Note that the bush 40 may be press-fitted into the welding pipe 32 manually by a human.

  Here, the cylindrical portion 42 of the bush 40 is arranged coaxially with the welded pipe 32 and is spaced apart on the radially inner side of the welded pipe 32. Further, a press-fit rib 46 is formed on the outer peripheral portion of the tube portion 42 so as to protrude outward in the radial direction of the tube portion 42, and the press-fit rib 46 is formed in the weld pipe 32 when the bush 40 is press-fit into the weld pipe 32. Touched. Thereby, a gap G is formed between the outer peripheral surface of the cylindrical portion 42 and the inner peripheral surface of the welded pipe 32. Therefore, by arranging the weld bead 33 of the weld pipe 32 in the gap G, the bush 40 can be pressed into the weld pipe 32 without the weld bead 33 affecting the bush 40. For this reason, for example, the bush 40 can be favorably press-fitted into the welded pipe 32 that has been welded without cutting the weld bead 33.

  Four press-fitting ribs 46 are formed in the circumferential direction of the cylindrical portion 42. For this reason, even if the press-fit rib 46 is crushed by the weld bead 33 when the bush 40 is press-fit into the weld pipe 32, the bush 40 is supported by the weld pipe 32 at the three press-fit ribs 46. Thereby, the axial misalignment of the bush 40 with respect to the weld pipe 32 is suppressed, and the bush 40 can be stably press-fitted into the weld pipe 32.

  Further, the press-fitting rib 46 extends from the intermediate portion in the axial direction of the cylindrical portion 42 to the side opposite to the press-fitting direction of the bush 40 (outside in the sheet width direction). As a result, as described above, the press-fitting rib 46 is not formed on the outer peripheral portion of the bush 40 at the inner end in the seat width direction. For this reason, when the bush 40 is inserted into the welded pipe 32, interference between the weld bead 33 and the press-fit rib 46 in the welded pipe 32 is suppressed, so that the assembly of the bush 40 to the welded pipe 32 can be improved. .

  Further, the cross-sectional shape of the press-fit rib 46 as viewed from the axial direction of the tube portion 42 is formed in an arc shape, and the temporary press-fit portion 48 of the press-fit rib 46 is closer to the tube portion 42 as it goes in the press-fit direction of the bush in a side view. Is inclined to. For this reason, after the bush 40 is inserted into the weld pipe 32, the bush 40 can be temporarily press-fitted into the weld pipe 32 at the portion of the temporary press-fit portion 48. Thus, when the bush 40 is fully press-fitted into the weld pipe 32, the bush 40 is supported in a state of being temporarily press-fitted into the weld pipe 32, so that the assembling property of the bush 40 to the weld pipe 32 can be further improved. .

  Furthermore, the temporary press-fit portion 48 is formed in a semi-conical shape that tapers as it goes in the press-fit direction (in the sheet width direction). As a result, when the bush 40 is inserted into the weld pipe 32 and the temporary press-fit portion 48 temporarily hits the weld bead 33 of the weld pipe 32, the bush 40 is rotated in the circumferential direction of the bush 40 by the temporary press-fit portion 48. Can be guided.

  In the present embodiment, the cushion frame 12 and the vehicle body floor are connected by the X link mechanism 14, but the cushion frame 12 and the vehicle body floor may be connected by a so-called parallel link mechanism. In this case, the cylindrical portion 42 of the bush 40 may be disposed outside the weld pipe 32 in the radial direction, and the bush 40 may be press-fitted into the weld pipe 32. An example of this case will be briefly described with reference to FIG.

  As shown in FIG. 7, the parallel link mechanism 50 includes a lower frame 52 connected to the vehicle body floor, a parallel link member 54, a welded pipe 32, and a bush 40.

  The press-fitting ribs 46 in the bush 40 protrude from the inner peripheral surface of the cylindrical portion 42 to the inner side in the radial direction of the cylindrical portion 42 and are in contact with the outer peripheral surface of the welded pipe 32. Thereby, a gap G is formed between the outer peripheral surface of the welded pipe 32 and the inner peripheral surface of the cylindrical portion 42. Therefore, for example, even when the pipe material in which the weld bead 33 (not shown in FIG. 7) is formed on the outer peripheral surface of the pipe is used for the weld pipe 32, the bush 40 is arranged by arranging the weld bead 33 in the gap G. On the other hand, the bush 40 can be press-fitted into the welded pipe 32 without being affected by the weld bead 33. For this reason, for example, the bush 40 can be press-fitted into the welded pipe 32 that has been welded without cutting the welding beat 33.

  The bush 40 is connected to the lower frame 52 so as not to move, and one end of the parallel link member 54 is connected to the outer peripheral surface of the bush 40 so as to be rotatable. Further, the other end portion of the parallel link member 54 is rotatably connected to the cushion frame 12. Thereby, the cushion frame 12 is connected to the vehicle body floor via the parallel link mechanism 50.

  Further, in the present embodiment, four press-fitting ribs 46 are formed in the cylindrical portion 42, but it is also possible to form three or more press-fitting ribs 46. Thereby, when the bush 40 is press-fitted into the welded pipe 32, the bush 40 is supported by the welded pipe 32 at at least three portions of the press-fitting ribs 46. An axial misalignment or the like is suppressed, and the bush 40 can be stably press-fitted into the weld pipe 32.

  Further, in the present embodiment, the press-fitting rib 46 extends from the intermediate portion in the axial direction of the cylindrical portion 42 to the flange portion 44 along the axial direction of the cylindrical portion 42. Instead of this, the press-fitting ribs 46 may be formed so as to extend along the axial direction of the cylindrical portion 42 from the end portion of the cylindrical portion 42 on the inner side in the sheet width direction.

  Further, in the present embodiment, the bush 40 and the weld pipe 32 are applied to the X link mechanism 14 of the vehicle seat 10, but the part of the vehicle seat 10 to which the bush 40 and the weld pipe 32 are applied is here. Not exclusively. For example, the bush 40 and the welded pipe 32 may be applied to a conventionally known lifter mechanism that adjusts the vertical position of the seat cushion of the vehicle seat 10.

10 Vehicle Seat 32 Welding Pipe (Pipe Member)
40 Bush 42 Cylinder 46 Press-fit rib (contact part)

Claims (3)

A pipe member that forms a skeleton of the vehicle seat and is formed in a pipe shape having a welded portion between end portions in the circumferential direction;
A bush inserted into the pipe member to connect the pipe member to another skeleton member of the vehicle seat;
Forming a part of the bush, and formed in a cylindrical shape coaxially arranged with the pipe member, and a cylindrical portion arranged spaced apart in the radial direction of the pipe member;
The cylindrical portion is integrally formed, protrudes from the outer peripheral surface or inner peripheral surface of the cylindrical portion in the radial direction of the cylindrical portion, and is opposite to the insertion direction of the bush from the axial intermediate portion of the cylindrical portion. A contact portion that is formed in a rib shape extending to the side and contacts the pipe member in a state where the bush is inserted into the pipe member;
Vehicle seat equipped with   The vehicle seat according to claim 1, wherein the contact portion is formed at three or more locations in the circumferential direction of the cylindrical portion. The contact portion is formed in an arc shape in a cross-sectional view seen from the axial direction of the cylindrical portion,
3. The vehicle seat according to claim 1, wherein an end portion of the contact portion on the insertion direction side of the bush is inclined toward the cylindrical portion side in a side view toward the insertion direction of the bush.