JP5005375B2 - Hinge pin coupling structure of seat reclining device and method of manufacturing seat reclining device - Google Patents

Description

  The present invention relates to a reclining device mainly for adjusting the inclination of a seat back in a vehicle seat, and more particularly to a hinge pin (operation shaft) provided in a reclining mechanism and a structure for connecting the hinge pin to a rotating operation member. The present invention also relates to a manufacturing method for coupling a hinge pin to a rotation operation member in a similar seat reclining device.

In Patent Document 1, in both reclining devices having round reclining units on both the left and right sides of a seat, the hinge pins of the reclining units on both sides are inserted into a connecting pipe, and the connecting pipe is pressed from the outer surface side to be plastically deformed and caulked and joined. The structure is described.
JP 2005-132145 A

  In the case of performing caulking and coupling as in Patent Document 1, since the surplus meat portion generated by the pressure deformation tends to rise to the outer surface side opposite to the pressing direction, the interference between the raised deformation portion and other members is considered. There is a need. For example, in the case of a structure in which the end portion of the hinge pin and a cylindrical cap member are caulked and joined, and this cap member is inserted and fixed (embedded) in an insertion hole of another rotating operation member, the raised deformation portion caused by caulking is inserted. It cannot be inserted because it interferes with the hole. Normally, such bulging deformation occurs on both sides of the pressure deformation area due to caulking, and therefore, insertion into the insertion hole is limited only to the area excluding the pressure deformation area and the bulging deformation area on both sides. Only the hinge pins and cap members need to be long. That is, downsizing and weight reduction of the reclining device are limited. The present invention has been made to solve such problems. A hinge pin provided in a reclining mechanism, a rotation operation member for applying a rotation operation force to the hinge pin, and an end of the hinge pin are inserted and fixed. In a seat reclining device having a cylindrical connecting member embedded in a moving operation member, a hinge pin coupling structure and manufacturing method for a seat reclining device that can be configured to be small and light while caulking and coupling the hinge pin and the cylindrical connecting member The purpose is to provide.

  The present invention includes the hinge pin, the rotation operation member, and the cylindrical connection member as described above, and forms the deformation pressing recess by pressing the cylindrical connection member from the outside to the inner diameter direction, thereby connecting the cylindrical connection member and the hinge pin. In the hinge pin coupling structure of the seat reclining device to be coupled, the cylindrical connection member coupled with the hinge pin advances from the bottom surface portion to the distal end portion of the cylindrical connection member. The tapered connecting portion is inclined so as to approach the outer peripheral surface of the cylindrical connecting member, and is positioned on the opposite side of the tapered connecting portion across the bottom surface portion in the axial direction of the cylindrical connecting member, and the cylindrical connecting member is pressed and deformed. A portion extending from the distal end portion of the cylindrical connecting member to the bottom surface portion of the deformation pressing recess is covered by the rotating operation member. As is characterized in that is embedded in the tubular connecting member to the rotating operation member.

  Further, the present invention provides a method of manufacturing a seat reclining device including the hinge pin, the rotation operation member, and the cylindrical connecting member as described above, a tip pressing surface portion substantially parallel to the axial direction of the cylindrical connecting member, and a cylindrical shape A cylindrical connecting member using a punch member having a tip cross-sectional shape surrounded by an advancing / retreating direction surface portion that is substantially orthogonal to the axial direction of the connecting member and a tapered pressing surface portion that is inclined in a direction away from the advancing / retreating direction surface portion as the distance from the tip pressing surface portion increases. In the state where the end of the hinge pin is inserted into the cylindrical connecting member, the punch connecting member presses the cylindrical connecting member from the outer surface side toward the inner diameter direction. In the region of the deformation pressing recess formed by the advancing / retreating direction surface portion side, the tubular connecting member is allowed to bend and deform to the outer surface side according to the pressing deformation, and the tapered pressing surface portion side In the region it is characterized by inhibiting the bulge deformation.

  According to the hinge pin coupling structure and the manufacturing method of the seat reclining device of the present invention described above, the seat reclining can be inserted into the rotating operation member without interfering with the position of the deformation pressing recess in the cylindrical connecting member. The apparatus can be reduced in size and weight.

  A seat reclining device 10 shown in FIG. 1 is provided on one side of a vehicle seat (not shown), and includes a round reclining unit 11, a hinge pin 12, an end cap (cylindrical connecting member) 13, an unlocking operation knob (turning). Moving operation member) 14. Although not shown, a round reclining unit and a hinge pin that are paired with the round reclining unit 11 and the hinge pin 12 are provided on the other side of the seat.

  The hinge pin 12 includes a cam operation shaft portion 12a, an intermediate shaft portion 12b protruding from one end of the cam operation shaft portion 12a and having a smaller diameter than the cam operation shaft portion 12a, and an intermediate shaft portion 12b extending from the intermediate shaft portion 12b. Further, the knob coupling shaft portion 12c having a smaller diameter, the flange portion 12d provided at the end of the cam operation shaft portion 12a opposite to the intermediate shaft portion 12b, and the intermediate shaft portion 12b following the flange portion 12d. And a pipe connecting portion 12e extending in the direction. A connecting pipe (not shown) is connected and fixed to the pipe connecting portion 12e, and the hinge pin 12 is rotated integrally with a hinge pin (not shown) on the other side of the seat via the connecting pipe. .

  The round reclining unit 11 includes a lower arm 21 provided in the vicinity of the rear end portion of the seat cushion frame, and a cam operation shaft portion 12a of the hinge pin 12 is fitted to a shaft hole 21a formed in the lower arm 21 so as to be relatively rotatable. Yes. A part of the cam operation shaft portion 12a has a non-circular cross-sectional shape having a pair of substantially parallel plane portions, and a rotation transmission hole 22a formed in the cam member 22 by the non-circular cross-section portion of the cam operation shaft portion 12a. It fits in. The hinge pin 12 and the cam member 22 rotate integrally. When the cam member 22 rotates forward and backward, the slide pole 24 supported by the lower arm 21 moves forward and backward in the radial direction around the hinge pin 12. The cam member 22 is held by a release plate 23.

  A ratchet 25 provided on the seat back side is fitted to the lower arm 21 so as to be relatively rotatable. The inner edge portion of the annular ratchet 25 and the outer edge portion of the slide pole 24 are opposed to each other, and inner teeth and outer teeth that can mesh with each other are formed. When the slide pole 24 moves in a direction away from the hinge pin 12 by the action of the cam member 22 described above, the inner teeth and the outer teeth mesh with each other, and the relative rotation of the ratchet 25 with respect to the lower arm 21 is restricted. That is, the locked state in which the tilting motion of the seat back with respect to the seat cushion is restricted. On the contrary, when the slide pole 24 moves in the direction approaching the hinge pin 12, the meshing of the inner teeth and the outer teeth is released, and the relative rotation of the ratchet 25 with respect to the lower arm 21 is allowed. That is, an unlocked state in which the seat back can be tilted is obtained. The hinge pin 12 is urged to rotate in a locking direction in which the external teeth of the slide pole 24 and the internal teeth of the ratchet 25 are engaged by a spring (not shown).

  The release plate 23 and the ratchet 25 have a through hole 23a and a through hole 25a, respectively, through which the hinge pin 12 is inserted. The intermediate shaft portion 12b and the knob coupling shaft portion 12c in the hinge pin 12 protrude to the side of the round reclining unit 11 through the through hole 23a and the through hole 25a. An end cap 13 is fixed to the outside of the knob coupling shaft portion 12c, and the end cap 13 is embedded and fixed in the shaft fixing hole 14a of the unlock operation knob 14. The unlocking operation knob 14 is a turning operation member provided on the side of the seat. By applying a turning operation force in a predetermined direction to the unlocking operation knob 14, the unlocking operation knob 14 resists the aforementioned urging spring in the locking direction. Thus, the hinge pin 12 can be rotated in the unlocking direction.

  The seat reclining device 10 having the above structure is characterized by a connection structure (coupling method) between the hinge pin 12 and the unlock operation knob 14 via the end cap 13. First, the hinge pin 12 is assembled to the round reclining unit 11 from the exploded state of FIG. As shown in FIG. 2, the round reclining unit 11 has a shaft hole 21a, a rotation transmission hole 22a, a through hole 23a, and a through hole 25a formed in the center thereof in communication with each other coaxially. The hinge pin 12 is inserted into the communication hole with the knob coupling shaft portion 12c side as a tip portion. The hinge pin 12 is restricted from being inserted into the round reclining unit 11 at a position where the flange portion 12d contacts the lower arm 21 (FIG. 3). Subsequently, using a caulking tool, the caulking margin 12f at the boundary between the cam operating shaft portion 12a and the intermediate shaft portion 12b is pressed and expanded toward the cam member 22 as shown in FIG. Then, the expanded caulking allowance portion 12 f is brought into contact with the side portion of the cam member 22, and the hinge pin 12 is prevented from coming off from the round reclining unit 11. That is, the lower arm 21 and the cam member 22 are sandwiched by the flange portion 12d and the caulking margin portion 12f, and the axial movement of the hinge pin 12 with respect to the round reclining unit 11 is restricted. At this time, the non-circular cross section of the cam operation shaft portion 12a is fitted into the rotation transmission hole 22a, and the hinge pin 12 and the cam member 22 are coupled so as to rotate integrally.

  Further, in the hinge pin 12 that is prevented from coming off, the intermediate shaft portion 12b and the knob coupling shaft portion 12c are projected to the side of the round reclining unit 11 through the through hole 23a and the through hole 25a. The end cap 13 is a cylindrical member having a hollow portion 13a formed therein, and the knob coupling shaft portion 12c is inserted into the hollow portion 13a. The intermediate shaft portion 12b of the hinge pin 12 has a larger diameter than the inner diameter size of the hollow portion 13a. When the end portion of the intermediate shaft portion 12b abuts against the end surface of the end cap 13, a knob coupling shaft into the hollow portion 13a. The insertion position of the part 12c is determined.

  The knob coupling shaft portion 12c and the end cap 13 are caulked and coupled using a punch tool (punch member) 31 shown in FIG. In this caulking operation, as shown in FIG. 4, the deformation preventing jig 30 is attached to the outside of the end cap 13. As shown in FIG. 5, with the knob coupling shaft portion 12c inserted into the hollow portion 13a, the end cap 13 is pressed by sandwiching the outer surface of the end cap 13 with a pair of opposing punch tools 31. The deformation pressing recess R is formed by being crushed in the inner diameter direction, and the insertion shaft portion 12c is sandwiched between inner portions of the deformation pressing recess R.

  The tip portions of the pair of punch tools 31 each have a trapezoidal cross-sectional shape having a taper pressing surface portion 31a as shown in FIG. Specifically, the punch tool 31 has a tip pressing surface portion 31b substantially orthogonal to the advancing / retreating direction (a direction substantially orthogonal to the axis of the hinge pin 12 and the end cap 13), and substantially parallel to the advancing / retreating direction of the punch tool 31. The advancing / retreating parallel surface portion 31c and the tapered pressing surface portion 31a that gradually inclines away from the advancing / retreating parallel surface portion 31c as the distance from the tip pressing surface portion 31b increases. At the time of caulking, the pair of punch tools 31 are formed so that the side on which the taper pressing surface portion 31a is formed faces the distal end portion side (the unlocking operation knob 14 side) of the end cap 13 and the advance / retreat parallel surface portion 31c is formed. In a state where the side that is being directed toward the base end side of the end cap 13 (the round reclining unit 11 side), it is moved closer to the direction substantially perpendicular to the axis of the hinge pin 12 to press the outer surface of the end cap 13. . Then, in the portion along the advancing / retreating parallel surface portion 31c in the deformation pressing recess R, the surplus meat portion generated by caulking deformation of the deformation pressing recess R rises to the outer surface side, and a deformation portion (building portion) S is formed. On the other hand, in the region of the deformation pressing recess R that is pressurized by the taper pressing surface portion 31a, such bulging deformation toward the outer surface side is suppressed. More specifically, the deformation pressing concave portion R of the end cap 13 is formed by a bottom surface portion R1 formed by the tip pressing surface portion 31b of the punch tool 31, a tapered surface portion R2 formed by the tapered pressing surface portion 31a, and an advancing / retreating parallel surface portion 31c. The deformed portion S is formed only on the region side following the standing wall portion R3 and is not formed on the tapered surface portion R2 side. That is, the punch tool 31 brings the surplus meat portion generated by the pressure deformation of the end cap 13 to only one end (the round reclining unit 11 side) of the deformation pressing recess R, and the other end (the unlock operation knob 14 side). Then, it has a shape that does not cause a raised deformation due to excess meat.

  In the end cap 13 after caulking, there is no raised deformation portion in the region on the tip side of the deformation portion S. Therefore, when the end cap 13 is embedded (inserted) in the shaft fixing hole 14a of the unlock operation knob 14, FIG. 6, it is possible to enter the shaft fixing hole 14 a immediately before the deformation portion S, that is, to the region including the deformation pressing recess R. Unlike the present embodiment, in the structure in which the raised deformed portions are formed on both the front and rear sides of the press deformed recess, the raised deformed portion on the end cap end side interferes, so the shaft of the operation knob is fixed to the formation region of the press deformed recess. It cannot be inserted into the hole. On the other hand, according to the hinge pin coupling structure of the present embodiment (manufacturing method using the punch tool 31), the region of the deformation pressing recess R is inserted into the shaft fixing hole 14a. Space becomes possible. In other words, the round reclining unit 11 and the unlock operation knob 14 can be disposed close to each other. Therefore, effects such as downsizing, weight reduction, and manufacturing cost reduction of the seat reclining device can be obtained.

  When the caulking coupling between the hinge pin 12 and the end cap 13 is completed as described above, the end cap 13 is inserted into the shaft fixing hole 14a as shown in FIG. The shaft fixing hole 14a is a circular hole having an inner diameter size corresponding to the outer diameter size of the end cap 13, and the end cap 13 is inserted into the shaft fixing hole 14a to the position regulated by the deformed portion S as described above. be able to. Then, the end cap 13 is fixed in the shaft fixing hole 14a by a fixing screw (not shown). Thereby, the hinge pin 12, the end cap 13, and the unlocking operation knob 14 are connected so as to rotate integrally. When the unlock operation knob 14 is rotated in this state, the above-described unlocking operation in the round reclining unit 11 can be performed via the hinge pin 12. At the same time, the hinge pin on the other side of the seat is also rotated through the connecting pipe connected to the hinge pin 12, and the unlocking operation is also performed in the round reclining unit on the other side.

  As mentioned above, although this invention was demonstrated based on illustration embodiment, this invention is not limited to this embodiment. For example, the detailed configuration of the reclining device having a hinge pin may be different from the round reclining unit 11 of the illustrated embodiment. Moreover, the retaining structure of the hinge pin 12 with respect to the round reclining unit 11 can be different from that of the illustrated embodiment.

It is the figure which looked at the sheet reclining device obtained by applying the hinge pin coupling structure and the manufacturing method according to the present invention as a part thereof in a side view. It is a figure which shows the decomposition | disassembly state of a round reclining unit, a hinge pin, an end cap, and an unlocking operation knob in the seat reclining apparatus of FIG. It is a figure which shows the state which assembled | attached the hinge pin from the decomposition | disassembly state of FIG. 2 to the round reclining unit, and stopped, and also crimped and joined the hinge pin and the end cap. FIG. 4 is a plan view from the direction of arrow IV in FIG. 3 showing a step of caulking and joining a hinge pin and an end cap. FIG. 5 is a side view of the step of caulking and joining a hinge pin and an end cap as viewed from the direction of arrow V in FIG. It is the figure which expanded and showed the insertion state of the hinge cap with respect to the axis | shaft fixing hole of this unlocking operation knob by making a part of unlocking operation knob into a cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seat reclining apparatus 11 Round reclining unit 12 Hinge pin 12c Knob coupling shaft part 13 End cap (tubular connection member)
13a Hollow part 14 Unlocking operation knob (turning operation member)
14a Shaft fixing hole 30 Deformation prevention jig 31 Punch tool (punch member)
31a Taper pressing surface portion 31b Tip pressing surface portion 31c Advance and retreat parallel surface portion R Deformation pressing recess portion R1 Bottom surface portion R2 Taper surface portion R3 Standing wall portion S Deformation portion (building up portion)

Claims (2)

A hinge pin provided in the reclining mechanism, a rotation operation member for applying a rotation operation force to the hinge pin, and a deformation pressing recess is formed by pressing from the outside to the inner diameter direction with the end of the hinge pin inserted. In a seat reclining device that has a cylindrical connecting member that is coupled to the hinge pin and embedded in the rotating operation member,
The cylindrical connecting member coupled with the hinge pin is
A bottom surface located at the bottom of the deformation pressing recess,
A tapered surface portion that inclines so as to approach the outer peripheral surface of the cylindrical connecting member as it proceeds from the bottom surface portion toward the distal end portion of the cylindrical connecting member;
A built-up portion that is located on the opposite side of the tapered surface portion across the bottom surface portion in the axial direction of the cylindrical connecting member and is raised in the outer diameter direction from the outer peripheral surface position before the cylindrical connecting member is pressed and deformed When,
Have
A seat reclining characterized in that the cylindrical connecting member is embedded in the rotating operation member so that a portion extending from the distal end portion of the cylindrical connecting member to the bottom surface portion of the deformation pressing recess is covered by the rotating operation member. The hinge pin connection structure of the device. 2. The method of manufacturing a seat reclining device according to claim 1, wherein the tip pressing surface portion is substantially parallel to the axial direction of the cylindrical connecting member, the advancing / retreating direction surface portion is substantially orthogonal to the axial direction of the cylindrical connecting member, and the tip pressing surface portion is separated. And a step of coupling the cylindrical connecting member with the hinge pin using a punch member having a tip cross-sectional shape surrounded by a taper pressing surface portion inclined in a direction away from the advancing / retreating direction surface portion. With the end portion inserted, the tubular connecting member is pressed from the outer surface side toward the inner diameter direction by the punch member, and in the deformation pressing recess formed by the punch member, it is pressed and deformed in the region on the front and rear direction surface portion side. The cylindrical connecting member according to the above is allowed to be deformed to the outer surface side, and the convex deformation is suppressed in the region on the taper pressing surface portion side. Manufacturing method of lining apparatus.

Images