JP4994122B2 - Hinge pin joint structure - Google Patents

Description

  The present invention relates to a joint structure between a connector pipe and a hinge pin inserted and fixed to an end of the connector pipe.

In the so-called double-folding seat seat support mechanism for vehicles that flips the seat up forward and stores the seat back in the space, the bracket is attached to the tip of the pivotable link via a hinge pin. A structure is known in which the plate at the bottom of the seat surface is supported by this bracket. A pair of links and brackets are provided apart from each other in the width direction of the seat, and left and right hinge pins are connected via a connector pipe to rotate the pair of left and right links in synchronization. The hinge pin is fixed to the end of the connector pipe by a technique such as welding.
JP 2005-313866 A

  By the way, in the joining structure of the hinge pin and the connector pipe in such a sheet apparatus, in the manufacturing stage, the hinge pin and the connector pipe are immersed and coated in a coating liquid (paint tank) in a state where the hinge pin and the connector pipe are joined and fixed. Since the end of the connector pipe is closed with a hinge pin, the coating liquid that has entered the connector pipe does not immediately drain during painting, and the coating liquid in the connector pipe gradually leaks through the drying process after painting. As a result, dripping occurred and the appearance might be deteriorated. In the painting process, degreasing and water washing are performed as a step before immersion in the coating liquid. However, there is a possibility that the washing water that has entered during the water washing may remain in the connector pipe, which is not preferable. The present invention has been made to solve these problems, and it is an object of the present invention to provide a hinge pin / connector pipe joining structure that is less likely to retain liquid in the connector pipe in the painting process and that is excellent in production efficiency.

The present invention is characterized in that , in a structure for joining a hollow cylindrical connector pipe and a hinge pin inserted and fixed to an end of the connector pipe, the hinge pin has the following configuration. An insertion portion that protrudes from the flange portion with a smaller diameter than the flange portion, on the first side surface of the flange portion from which the insertion portion protrudes, from the proximal end side of the insertion portion toward the outer peripheral portion of the flange portion It has a radial groove formed in the radial direction, and has a flat surface on the second side surface opposite to the side from which the insertion portion projects out of the flange portion. It has the plate-shaped member joined with respect to the 2nd side of this hinge pin. The hinge pin and the connector pipe are joined by inserting the insertion portion on the hinge pin side into the connector pipe and bringing the end of the connector pipe into contact with the first side surface of the hinge pin. The radial groove formed in the flange portion of the hinge pin, in a joined state of the connector pipe and hinge pin communicates the inner space and the outside of the connector pipe, to discharge the liquid which has entered into the connector pipe in the painting process to the outside It becomes a discharge channel.

It is effective to form a plurality of radial grooves on the flange portion of the hinge pin in the radial direction centering on the insertion portion. The radial groove may be an inclined groove that gradually increases in depth as it proceeds from the inner diameter side close to the insertion portion to the outer diameter direction.

  The insertion portion of the hinge pin may be configured to have a small diameter so as to be loosely fitted in the connector pipe, and the hinge pin may be fixed to the connector pipe in a state where the axis of the insertion portion is eccentric with respect to the axis of the connector pipe. . Since the space between the outer peripheral surface of the small-diameter insertion portion and the inner peripheral surface of the connector pipe communicates with the radial groove, the discharge efficiency of the coating liquid that has entered the connector pipe can be increased.

  Alternatively, at least one plane portion substantially parallel to the axial direction of the connector pipe is formed on the outer peripheral surface of the insertion portion of the hinge pin, and the space between the plane portion and the inner peripheral surface of the connector pipe is a radial groove. You may comprise so that it may communicate. Also with this configuration, it is possible to increase the discharge efficiency of the coating liquid that has entered the connector pipe.

Moreover, through in terms of providing the outward protrusion that protrudes in the direction opposite to the insertion portion from the second side of the flange portion, as a separate discharge flow channel to the radial grooves, the hinge pin in the axial direction, It is also possible to form an axial through hole having one end opened at the distal end of the insertion portion and the other end opened at the end of the outward projecting portion.

FIG. 1 shows a seat surface support mechanism for a double folding seat for an automobile as an application example of a joining structure of a connector pipe and a hinge pin according to the present invention. An inner link (plate-like member) 13 and an outer link (plate-like member) are connected to a standing wall portion raised upward from a base member 10 fixed to the vehicle floor via first hinge pins 11 and 12. Each lower end part of 14 is supported so that rotation is possible. Second hinge pins 15, 16 are fixed to the upper ends of the links 13, 14, and brackets 17, 18 are supported so as to be rotatable with respect to the hinge pins 15, 16. A connector pipe 19 is connected to the hinge pins 15 and 16 in order to rotate the inner link 13 and the outer link 14 in synchronization. A support plate 20 is fixed on the brackets 17 and 18.

  As shown in FIGS. 2 and 3, the support plate 20 is fixed to the lower frame of the seat surface portion 22 of the rear seat 21. In the normal seating state, as shown in FIG. 2, the seating surface portion 22 is in a state of being directed substantially in the horizontal direction. When the rear seat 21 is stored, the inner link 13 and the outer link 14 are rotated in the flip-up direction as shown in FIG. At this time, the brackets 17 and 18 are also rotated to follow, and as a result, the seat surface portion 22 is in a substantially vertical direction. Subsequently, the backrest portion 23 of the rear seat 21 is tilted forward toward the space occupied by the seat surface portion 22 in the normal sitting state. As a result, the rear seat 21 is stored, and a wide storage space is obtained. The inner link 13 and the outer link 14 are rotationally biased in the direction of the normal seating state in FIG. 2 by a link biasing spring 24 provided around the hinge pin 12 of the outer link 14. The brackets 17 and 18 are urged to rotate in the direction of the normal seating state in FIG. 2 by a bracket urging spring 25 provided around the hinge pin 15.

  In the manufacturing process of the seating surface support mechanism described above, a link unit which is an intermediate assembly in which the hinge pins 15 and 16 are attached to the inner link 13 and the outer link 14 and the hinge pins 15 and 16 are connected by the connector pipe 19 is formed. The The link unit is painted by being immersed in a tank in which a coating liquid is stored. Also, as a pre-painting step, the link unit is degreased and washed with water. The connecting structure of the connector pipe and the hinge pin according to the present invention is provided with a discharge flow path that makes it easy for the cleaning water and the coating liquid that have entered the connector pipe 19 to escape to the outside in the painting process, and the details will be described with reference to FIG. Will be explained. In the following embodiments, the joint portion between the hinge pin 15 on the inner link 13 side and the connector pipe 19 is described. However, the same liquid is discharged between the hinge pin 16 on the outer link 14 side and the connector pipe 19. A channel structure may be provided.

4 and 5 show a first embodiment of a hinge pin joint structure according to the present invention. The hinge pin 15 includes a columnar insertion portion 15a inserted into the connector pipe 19, a disc-shaped flange portion 15b having a diameter larger than that of the insertion portion 15a and abutting against an end portion of the connector pipe 19, and a flange portion 15b. A cylindrical outer protrusion 15c having a smaller diameter is formed, and a spring engagement groove 15d with which the link biasing spring 24 is engaged is formed on the outer peripheral surface of the outer protrusion 15c. The flange portion 15b has a first side surface on which the insertion portion 15a protrudes (an insertion restriction surface 15e to be described later) and a second side surface on which the outer protrusion portion 15c protrudes. It is formed as a parallel plane. The outward projecting portion 15c is inserted into a link through hole 13a formed in the inner link 13, and the second side surface of the flange portion 15b is in contact with the side surface 13b of the inner link 13, and the side surface 13b and the flange portion are in contact with each other. The hinge pin 15 is fixed to the inner link 13 by welding between 15b. The outward projecting portion 15c projecting from the link through hole 13a is inserted into the shaft hole formed in the bracket 17 in the assembly process after painting, and the bracket 17 is supported to be rotatable around the outward projecting portion 15c. Is done.

The insertion portion 15 a is set such that its diameter (outer diameter size) is smaller than the inner diameter size of the connector pipe 19 by a predetermined amount so that the insertion portion 15 a can be reliably inserted and removed without interfering with the connector pipe 19. Yes. On the insertion restricting surface (the surface facing the connector pipe , the first side surface) 15e facing the end of the connector pipe 19 in the flange portion 15b, toward the radial direction centering on the axis of the flange portion 15b, A total of eight radial grooves 30 are formed. Each radial groove 30 is formed to communicate from the proximal end portion of the insertion portion 15a to the outer peripheral portion of the flange portion 15b. When the insertion restricting surface 15e of the flange portion 15b contacts the end of the connector pipe 19, the formation region of the radial groove 30 is not blocked by the end of the connector pipe 19, and the inside and outside of the connector pipe 19 A communication channel (discharge channel) that communicates with each other is configured. The space between the insertion restricting surface 15e and the outer peripheral surface near the end of the connector pipe 19 that contacts the insertion restricting surface 15e is fixed by welding. This welding process is performed so as not to block the radial grooves 30 as much as possible. However, if at least one of the eight radial grooves 30 is opened, a liquid discharge function to be described later is performed. Can be obtained.

  With the hinge pin 15 and the connector pipe 19 connected and fixed as described above, the radial groove 30 communicates with the clearance portion between the outer peripheral surface of the insertion portion 15a and the inner peripheral surface of the connector pipe 19. . Therefore, the cleaning water and the coating liquid that have entered the connector pipe 19 in the painting process are efficiently discharged to the outside through the radial groove 30. The depth of the radial groove 30 is set to a preferable value according to various conditions such as the viscosity of the coating liquid.

  6 and 7 show a second embodiment of the hinge pin joint structure according to the present invention. In the following embodiments, the portions denoted by the same reference numerals as those in FIGS. 4 and 5 are the same as those in the first embodiment, and redundant description is omitted. The hinge pin 15 of this embodiment includes an insertion portion 115a having a smaller diameter than the insertion portion 15a of the previous embodiment, and the clearance between the outer peripheral surface of the insertion portion 115a and the inner peripheral surface of the connector pipe 19 is large. Further, each of the eight radial grooves 130 formed on the insertion restricting surface 15e of the flange portion 15b gradually approaches the outward projecting portion 15c from the proximal end portion of the insertion portion 115a toward the outer diameter direction of the flange portion 15b. It is formed as an inclined groove that increases in depth in the direction of the movement. According to the structure of the second embodiment, the flow passage cross-sectional area of the discharge flow passage becomes larger than that of the first embodiment, so that the liquid in the connector pipe 19 can be discharged more efficiently.

  8 and 9 show a third embodiment of the hinge pin joint structure according to the present invention. The hinge pin 15 of this embodiment includes an insertion portion 215a having a smaller diameter than the insertion portion 15a of the first embodiment, and the axis X1 of the hinge pin 15 (insertion portion 215a) is eccentric with respect to the axis X2 of the connector pipe 19. It is fixed in the state. A radial groove 30 similar to that of the first embodiment is formed on the insertion restricting surface 15e of the flange portion 15b, and the space between the inner peripheral surface of the connector pipe 19 and the outer peripheral surface of the insertion portion 215a is radial. It communicates with the groove 30. According to this structure, a portion having a large radial clearance is formed in a portion between the outer peripheral surface of the insertion portion 215a and the inner peripheral surface of the connector pipe 19, and the cleaning is performed from the connector pipe 19 to the radial groove 30 side through the region. Water and coating liquid can be easily removed, and the discharge efficiency can be improved.

  10 and 11 show a fourth embodiment of the hinge pin joint structure according to the present invention. The hinge pin 15 of this embodiment has a non-circular cross-sectional shape in which the insertion portion 315a inserted into the connector pipe 19 has a pair of parallel flat portions 31 that are substantially parallel to the axis of the connector pipe 19 and the hinge pin 15 instead of a circular cross-section. It has become. The parallel plane part 31 is formed in the whole area of the axial direction from the front-end | tip part of the insertion part 315a to a base end part. And the radial direction groove | channel 30 similar to 1st Embodiment is formed on the insertion control surface 15e of the flange part 15b, and the space between the internal peripheral surface of the connector pipe 19 and the parallel plane part 31 is radial direction. It communicates with the groove 30. According to this structure, the space between the inner peripheral surface and the connector pipe 19 is wide at the portion where the parallel flat portion 31 is formed, and cleaning water or paint is applied from the inside of the connector pipe 19 to the radial groove 30 as in the third embodiment. The liquid is easily removed.

  12 and 13 show a fifth embodiment of the hinge pin joint structure according to the present invention. The hinge pin 15 of this embodiment has an axial through hole (axial through hole) 31 penetrating from the distal end portion of the insertion portion 15a inserted into the connector pipe 19 to the end portion of the outward projecting portion 15c. ing. In this structure, the cleaning water and the coating liquid that have entered the connector pipe 19 can be discharged to the outside through the through hole 32. That is, the through-hole 32 functions as a liquid discharge channel, similarly to the radial groove 30 and the radial groove 130 of the previous embodiment.

As described above, according to the connector pipe and hinge pin joining structure of the present invention, the discharge flow path that connects the internal space of the connector pipe and the outside is formed in the hinge pin in a state in which the connector pipe and the hinge pin are combined, and the painting process Since the cleaning water and the coating liquid that have entered the connector pipe can be discharged to the outside through this discharge channel, problems such as dripping of the coating liquid after the coating process can be prevented. Further, it is possible to shorten the time until the excess liquid in the connector pipe is removed, thereby improving the production efficiency. The radial groove constituting the discharge flow path is a groove formed on one side surface (first side surface) of the flange portion of the hinge pin, and the other side surface (second side surface) of the flange portion has the shape of the radial groove. Since it is formed as a flat surface that does not reflect, a plate-like member such as a link can be reliably joined.

  Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the illustrated embodiment, and can be improved or modified without departing from the gist of the invention. For example, although the illustrated embodiment is applied to a support mechanism for a double folding sheet for automobiles, the hinge pin joining structure of the present invention can be applied to other than the double folding sheet. Further, in the illustrated embodiment, in the type in which the radial groove is formed in the flange portion of the hinge pin as the liquid discharge channel, eight radial grooves are formed, but the number of the radial grooves is other than eight. There may be.

It is a perspective view which shows the seat surface support mechanism of the double folding sheet | seat for motor vehicles to which the hinge pin junction structure of this invention is applied. It is a side view of the normal seating state of the double folding seat provided with the seat surface support mechanism of FIG. It is a side view of the accommodation state of the sheet. It is a sectional side view near the junction part of a hinge pin and a connector pipe in the 1st Embodiment of this invention. It is the front view which looked at the hinge pin of FIG. 4 from the insertion part side. It is a sectional side view near the junction part of a hinge pin and a connector pipe in the 2nd Embodiment of this invention. It is the front view which looked at the hinge pin of FIG. 6 from the insertion part side. It is side sectional drawing of the junction part vicinity of a hinge pin and a connector pipe in the 3rd Embodiment of this invention. It is the front view which looked at the hinge pin of FIG. 8 from the insertion part side. It is a sectional side view near the junction part of a hinge pin and a connector pipe in the 4th Embodiment of this invention. It is sectional drawing of the insertion part of a hinge pin and connector pipe which follow the AA line of FIG. It is a sectional side view of the junction part vicinity of a hinge pin and a connector pipe in the 5th Embodiment of this invention. It is sectional drawing of the insertion part of a hinge pin and connector pipe which follow the BB line of FIG.

Explanation of symbols

13 Inner link 14 Outer link 15 16 Hinge pin 15a 115a 215a 315a Insertion part 15b Flange part 15c Outward projecting part 15d Spring engagement groove 15e Insertion restriction surface (opposite surface with connector pipe)
19 Connector pipe 17 18 Bracket 21 Rear seat 22 Seat surface portion 23 Backrest portion 30 130 Radial groove (discharge flow path)
31 Parallel plane part 32 Through hole (discharge flow path)

Claims (6)

In the structure for joining the hollow cylindrical connector pipe and the hinge pin inserted and fixed to the end of the connector pipe,
The hinge pin has a flange portion and an insertion portion that is smaller in diameter than the flange portion and protrudes from the flange portion, and a proximal end of the insertion portion is formed on a first side surface of the flange portion from which the insertion portion protrudes. A radial groove formed in a radial direction from the portion side toward the outer peripheral portion of the flange portion, and having a flat surface on the second side surface on the opposite side of the flange portion from which the insertion portion protrudes;
Having a plate-like member bonded to the second side surface of the hinge pin;
Inserting the insertion portion of the hinge pin into the connector pipe and bringing the end of the connector pipe into contact with the first side surface of the hinge pin to join the hinge pin and the connector pipe; and
The radial grooves in the bonding state of the connector pipe and the hinge pin are communicated with the internal space and the outside of the connector pipe, and a discharge passage for discharging the liquid which has entered into the connector pipe in the painting process to the outside Become ;
Hinge pin joint structure characterized by The hinge pin joint structure according to claim 1, wherein a plurality of the radial grooves are formed in a flange portion of the hinge pin in a radial direction centering on the insertion portion. 3. The hinge pin joint structure according to claim 1, wherein the radial groove is an inclined groove that gradually increases in depth as it proceeds from the inner diameter side close to the insertion portion toward the outer diameter direction. 4. Eccentric in hinge pin junction structure according to any one of claims 1 to 3, the outer diameter of the insertion portion of the hinge pin is smaller than the inner diameter of the connector pipe, the axis of the insertion portion is with respect to the axis of the connector pipe In this state, the hinge pin is fixed to the connector pipe, and the space between the outer peripheral surface of the small-diameter insertion portion and the inner peripheral surface of the connector pipe communicates with the radial groove. The hinge pin joining structure according to any one of claims 1 to 3 , further comprising: at least one plane portion substantially parallel to the axial direction of the connector pipe on the outer peripheral surface of the insertion portion of the hinge pin; A hinge pin joint structure in which a space between the inner peripheral surface of the connector pipe communicates with the radial groove. In hinge pin junction structure according to any one of claims 1 to 5, the hinge pin has an outward protrusion that protrudes in the direction opposite to the above insertion portion from the second side of the flange portion,
Through the hinge pin in the axial direction, the hinge pin junction structure having an axial through hole of which one end portion is opened to the distal end of the insertion portion, the other end is opened to the distal end of the outer protrusion.

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