JPH0426733Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a joint device, and in particular to one in which a joint member made of resin is integrally molded into a mounting hole opened in a rod. This invention relates to a connecting rod that is useful for use in a crank device in a wiper device of an automobile.

[Conventional technology]

Generally, in wiper devices for wiping automobile windows, a crank device is used to convert the rotational motion of the wiper motor into the swinging motion of the wiper arm. A connecting rod in which a spherical bearing member as a joint member made of resin is integrally molded (hereinafter referred to as outsert molding) is sometimes used.

As such a connecting rod, a plurality of slits are formed on the inner circumferential surface of a spherical bearing member at the same time during outsert molding to enhance the insertion work of the spherical shaft as a mating joint member. be.

[Problem that the invention attempts to solve]

However, in such a joint device, it is necessary to ensure a predetermined wall thickness from the rod's mounting hole to the inner surface of the spherical bearing member, but the mold that forms the slit uses the rod's mounting hole. Since the positioning with the rod is performed by using the slit, there is a drawback that the depth of the slit becomes deeper than necessary.

An object of the present invention is to provide a joint device that allows flexibility in designing the depth of the slit.

[Means for solving problems]

In the joint device according to the present invention, a circular mounting hole 5 is provided in a flat plate-shaped mounting portion 3 formed on the rod 1, and a spherical bearing member 40 is mounted in the mounting portion 3, with the spherical center thereof being The spherical bearing member 40 is outsert-molded from resin and is arranged so as to approximately coincide with the center of the mounting hole 5.The spherical bearing member 40 has an opening parallel to the mounting hole 5, and a plurality of stripes formed in this opening. The slits 41 are arranged at approximately equal intervals in the circumferential direction and are each opened so as to extend near the maximum diameter of the spherical bearing member 40, and the spherical shaft 43 is pushed into the spherical bearing member 40 from the opening, In the joint device that is rotatably fitted, a plurality of small diameter portions 5a are arranged on the inner periphery of the attachment hole 5 of the attachment portion 3 at positions facing each of the slits 41 and project radially inward. It is characterized by being set up.

[Effect]

According to the above-mentioned means, since the inner diameter of the portion of the mounting hole facing the slit can be set small, the degree of freedom in designing the depth of the slit can be correspondingly increased. On the contrary, the inner diameter dimensions of other parts of the mounting hole can be freely set regardless of the depth of the slit.

〔Example〕

Fig. 1 is an enlarged partial vertical sectional view showing a connecting rod which is an embodiment of the present invention, and Fig.
3 is an enlarged partial vertical sectional view showing the assembled state; FIG. 4 is a partially cutaway side sectional view showing one step of outsert molding in the manufacturing method; FIG. 5 6 is a partial front sectional view showing another process, and FIG. 6 is an enlarged partial perspective view thereof.
FIGS. 7 and 8 are enlarged partial longitudinal sectional views showing other steps, respectively.

In this embodiment, the connecting rod as a joint device is formed by outsert molding, with spherical bearing members as joint members made of resin aligned in mounting holes opened at both ends of the rod. It is molded using an outsert molding device as shown below.

In this example, the rod 1, which has spherical bearing members on both ends by outsert molding, is formed into the shape shown in FIGS. 1 and 6 (only a portion is (as shown in the figure) in advance. The rod 1 is formed into a pipe shape as a whole, and at both ends of the rod 1 (only one end is shown) there are mounting portions 3 formed by outsert-molding a spherical bearing member.
They are each formed by being crushed into an oval-shaped flat plate having a width wider than the width of the pipe-shaped portion 2. The connecting part 4 for connecting the pipe-shaped part 2 and the flat plate-shaped mounting part 3 in the rod 1 while harmonizing or absorbing the difference in shape has a roughly M-shaped cross section with a gently curved upper wall. However, the shape is continuously changed so that the height gradually decreases from the pipe-shaped portion 2 toward the attachment portion 3 side, and the width gradually increases.

A mounting hole 5 into which a spherical bearing member is outsert-molded is concentrically formed in the mounting portion 3 of the rod 1, and a plurality of small diameter portions 5 are formed on the inner periphery of the mounting hole 5.
a are arranged at equal intervals in the circumferential direction and protrude inward in the radial direction. These small diameter parts 5
a is disposed at a position facing a positioning member to be described later, that is, a slit formed by this positioning member, and the small diameter portion 5a is set so that its inner diameter matches the outer dimension of the positioning member. Accordingly, it is configured so that it can play a role as a positioned portion during outsert molding. Grooves 6 having a V-shaped cross section are arranged concentrically in the vicinity of the mounting hole 5 on the front and back surfaces of the mounting portion 3, and are respectively carved in the shape of a perfect circular ring.

On the other hand, the outsert molding device 7 used in this embodiment is a mold clamping cylinder device (not shown).
The upper mold 10 and the lower mold 2 are matched with each other by
0, and the upper mold 10 and the lower mold 20 are respectively installed on mounting plates that can be moved toward and away from each other. The upper mold 10 and the lower mold 20 are provided with cavity blocks 11 and 21, respectively, and an upper mold recess 12 and a lower mold recess 22 are formed on the mating surfaces of both blocks 11 and 21, and one side of the rod is provided with an upper mold recess 12 and a lower mold recess 22. The upper mold recess 12 is a hollow chamber in the shape of an approximately trapezoidal cone, and the lower mold recess 22 is approximately circular. Each is configured in a plate-shaped hollow chamber.

An upper holding block 14 is fixedly suspended from the upper mounting plate 13 by bolts or the like, and a guide hole 15 formed in a substantially two-step cylindrical shape is formed in the block 14 so as to pass through it in the vertical direction. ing. The upper mold cavity block 11 is fitted into the guide hole 15 so as to be slidable in the vertical direction while being prevented from rotating by the anti-rotation pin 16. By engaging with the shoulder portion of the guide hole 15, the upper mold cavity block 11 is fitted into a predetermined position. It is held so that it can move forward and backward with respect to the holding block 14 with a stroke of
is constantly urged downward by a compression spring 17 interposed between the mounting plate 13 and the mounting plate 13. A gate 18 is provided on the mating surface of the upper cavity block 11.
is opened so that resin as a molding material can be injected into the cavity 8, and the gate 18 communicates with a runner 19 opened in the holding block 14.

On the other hand, in the mating surface of the lower mold cavity block 21, a rod accommodating recess 23 having the same shape as the planar projection external shape of the end of the rod 1 described above is sunk so as to overlap with the lower mold cavity recess 22. The receiving recess 23 extends in a direction opposite to the gate 18 of the upper mold cavity block 11.

In addition, the lower mounting plate 24 includes a lower holding block 2.
6 is supported via a spacer 25, and this block 26 has a holding hole 27 formed in a hollow shape of an approximately two-step cylinder. Holding hole 27
The lower mold cavity block 21 is inserted in a state in which it is prevented from rotating by a rotation stopper pin 28, and the cavity block 21 has a guide hole 29 formed in a hollow shape of an approximately two-stage cylinder. are arranged concentrically and are opened so as to penetrate in the vertical direction. A core 30 formed into a generally cylindrical shape as a whole is fitted into the guide hole 29 so as to be slidable in the vertical direction, and a spherical shaft-shaped portion 30a has a spherical shaft-shaped portion 30a at the upper end of the core 30. It is formed so that it can be formed.

On the outer periphery of the core 30, a plurality of positioning members 31 are arranged at approximately equal intervals in the circumferential direction and protrude radially so as to extend parallel to the axis. The diameter is set to be equal to the inner diameter of the group of small diameter portions 5a protruding from the attachment hole 5 of the rod 1. A collar 32 is in contact with the lower ends of the core 30 and the group of positioning members 31, and the collar 32 is moved up and down in the lower large diameter part of the guide hole 29 until it engages with the step between the upper small diameter part and the upper small diameter part. , middle child 3
0 and the upper and lower limit positions of the positioning member 31 are defined.

A movable plate 33 is floatingly supported on the mounting plate 24 so as to be constantly urged upward via a compression spring 34, and a push-up bar 35 and a push-up sleeve 36 are mounted on the movable plate 33 so that they are aligned with each other on the center line. They are arranged concentrically and fixed on vertical stands. The upper end of the push-up sleeve 36 passes through the spacer 25 and is abutted against the lower end surface of the collar 32, and the upper end of the push-up bar 35 is connected to the push-up sleeve 3.
6 and is concentrically screwed into the lower end of the core 30. Further, a pair of push-down bars 37 are arranged on the left and right sides of the push-up sleeve 36 on the movable plate 33, and are fixed and vertically erected.
The upper end of the spacer 25 and the holding block 26
is slidably inserted therethrough and protrudes from the upper surface of the lower die 20.

Next, a method for manufacturing a connecting rod according to this embodiment, in which a spherical bearing member is molded into a rod preformed as described above using the outsert molding apparatus according to the configuration described above will be explained. The configuration of the connecting rod according to this embodiment will now be explained.

When the upper mold 10 and the lower mold 20 are opened in the outsert molding device 7, the movable plate 33 is pushed up by the spring 34 as shown in FIG. 5, so that the core 30 and the positioning member 31 is set at the upper limit position.

In this state, the rod 1 is attached to the lower mold 20, the attachment part 3, the connection part 4, and the pipe-shaped part 2 at one end thereof.
It is set by fitting a part of the rod into the rod receiving recess 23. At this time, as shown in FIG. 5 and FIG.
The outer surfaces of a plurality of positioning members 31 that protrude radially from the outer periphery of the core 30 are respectively fitted. Here, since the outer diameter of the positioning member 31 group is set to be centered with respect to the cavity recess 22, the rod accommodation recess 23 is set to be smaller than the outer diameter of the rod 1 in order to absorb press processing errors. Even if the rod 1 is formed to be larger, the attachment hole 5 of the rod 1 and the mold cavity 8 can be aligned with high accuracy by fitting the small diameter portion 5a group of the attachment hole 5 with the positioning member 31 group. will be done.

Next, when the upper mold 10 is relatively lowered by the mold clamping cylinder device and is matched with the lower mold 20, the rod 1 is moved between the upper mold 10 and the lower mold 20, as shown in FIG. It is inserted into the cavity 8 while being sandwiched between them.

Here, when the upper mold 10 is relatively lowered, as shown in FIG. 7, the upper mold cavity block 11 is pressed down against the holding block 14 by the spring 17. The upper mold cavity block 11 is pressed against the rod 1 set on the lower mold 20. Therefore, as described below, before the group of positioning members 31 is pulled out from the mounting hole 5, the rod 1 is held by the upper die 10 and the lower die 20, so that the attachment hole 5 of the rod 1 and the cavity 8 are The centering accuracy will be maintained as is.

When the upper mold 10 is further lowered after the upper mold cavity block 11 is pressed against the lower mold 20, the spring 17 that makes the upper mold cavity block 11 protrude is compressed and deformed. Since the cavity block 11 slides within the guide hole 15 and is relatively pushed into the holding block 14, the holding block 14 is lowered and the lower die 20
on the holding block 26.

When the upper die 10 and the lower die 20 are brought together, the spring 3 with the push rod 37 lifting the movable plate 33 by the upper die 10 as shown in FIG.
4, the movable plate 33 is pushed down to the lower limit position. When the movable plate 33 is pushed down to the lower limit position, the core 30 is pushed down through the push-up bar 35 and push-up sleeve 36 that are fixed to the movable plate 33.
Then, the positioning members 31 are set in the cavity 8 at the lower limit position, which is the proper molding position. As a result, the group of positioning members 31 is pulled out of the mounting hole 5 of the rod 1, so that the centering state is released.

Thereafter, when the molding material is injected through the gate 18 and filled into the cavity 8, a spherical bearing member 40 as a joint member is molded, as shown in FIG. At this time, since the mounting portion 3 of the rod 1 is inserted into the cavity 8, the spherical bearing member 40 is integrally outsert molded into the mounting portion 3 of the rod 1. Since the mounting hole 5 of the rod 1 and the cavity 8 are aligned, the spherical bearing member 40 formed by the cavity 8 is integrally installed in the mounting hole 5 of the rod 1 with its center aligned. This means that the

In this embodiment, the lower limit position is set so that the positioning member 31 slightly protrudes into the lower mold cavity recess 22 during molding as shown in FIG. As shown in , on the inner peripheral surface of the lower end of the spherical bearing member 40,
A plurality of slits 41 are formed simultaneously. As will be described later, this group of slits 41 makes it easy to extract the core from the spherical bearing member and to push the spherical shaft as the mating joint member into the spherical bearing member.

When the molding of the spherical bearing member 40 is completed, the upper mold 1
0 is relatively raised and separated from the lower mold 20.
When the upper mold 10 is released, the movable plate 33 is urged upward by the spring 34, so the core 30
Then, the positioning member 31 is pushed up via the push-up rod 35 and the push-up sleeve 36, and returned to its original upper limit position.

Subsequently, the rod 1 is removed from the lower mold 20.
At this time, the inner periphery of the lower end of the spherical bearing member 40 is engaged with the outer periphery of the core 30, but since the slit 41 is carved in the inner periphery of the lower end as described above, the spherical surface of the core 30 The process of releasing the bearing member 40 from the mold can be performed relatively easily. In this way, the connecting rod 39 shown in FIG. 1 is manufactured.

When the connecting rod 39 as a joint device manufactured by the above method is used in a crank device in a wiper device, the spherical shaft 43 is pushed into the spherical bearing member 40 as shown in FIG. Then, the crank arm, the other end of which is fixed to the output shaft (not shown) of the wiper motor, or one end of the wiper arm shaft (not shown) is fixed to the spherical shaft 43 by appropriate means such as caulking. When the spherical shaft 43 is pushed into the spherical bearing member 40, since the slit 41 is formed in the opening of the bearing member 40, the operation can be carried out relatively easily.

When this connecting rod 39 is mounted on a wiper device (not shown), a third
As shown in the figure, a seal member 44 is interposed between the spherical bearing member 40 and the spherical shaft 43 to prevent water from entering the spherical bearing surface. At this time,
The seal member 44 is pressed against the outer portion of the group of slits 41 in the spherical bearing member 40, so that
Since the sealed state is maintained, the sealing allowance S is the outermost diameter dimension of the slit 41, that is,
It depends on the depth of the slit 41. In other words, it is desirable that the bottom 41a of the slit 41 be as far away from the inner peripheral surface of the attachment hole 5 as possible.

In this embodiment, the slit 41 is molded simultaneously with the spherical bearing member 40 by the positioning member 31, and the outermost diameter of the positioning member 31 is the inner diameter of the small diameter portion 5a protruding inwardly into the mounting hole 5. Since the dimensions are set to be equal to each other, the outermost diameter of the slit 41 is located closer to the inside than the inner diameter of the mounting hole 5 by the amount that the small diameter portion 5a protrudes inward. Therefore, the sealing distance S of the spherical bearing member 40 with respect to the sealing member 44 increases as the outermost diameter of the slit 41 moves inward.

On the other hand, when the wiper device is operated, the maximum load is applied to the thick wall portion 42 of the connecting rod 39 located on the axial center line of the rod 1. The thick portion 42 located on the axial center line is formed thick enough to prevent the small diameter portion 5a from protruding, so that it can sufficiently withstand the maximum load.

In this way, the small diameter portion 5a is formed on the inner circumference of the mounting hole 5.
By arranging the slits 41 in correspondence with the slits 41 of the spherical bearing member 40, it is possible to have flexibility in the design regarding the depth of the slits 41 and the thickness of the thick wall portion 42 of the spherical bearing member 40. Therefore, it is possible to realize a design that appropriately deals with the sealing allowance and maximum load for the entire connecting rod.

Also, a small diameter portion 5a protruding from the inner circumference of the mounting hole 5 is provided.
is in a state where it bites into the spherical bearing member 40, so the small diameter portion 5a functions as a rotation stopper that prevents the spherical bearing member 40 from rotating with respect to the mounting hole 5.

On the other hand, since the grooves 6 carved on the front and back surfaces of the attachment part 3 of the rod 1 are formed in a continuous circular ring shape, they do not function as a rotation prevention part, but they have a radial movement prevention function. It also functions as a barrier to water inundation routes.

Incidentally, the molded resin of the spherical bearing member 40 contracts when hardened. During this contraction, if the groove 6 is formed in an intermittent annular shape, there will be a difference in the distribution of the amount of contraction locally, causing distortion in the spherical bearing member 40. However, in this embodiment, since the groove 6 is formed in a circular ring shape, no distortion occurs during contraction.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the joint member is not limited to being molded by the method described above using the outsert molding device having the above configuration, but may be molded by another method using another device.

The number and length of slits carved into the joint member,
The width, depth, inner diameter and circumferential dimensions of the small diameter section interposed between the slit and the mounting hole are determined by the desired sealing allowance, the maximum load acting on the connecting rod, and the material of the rod. It is desirable to select an appropriate one depending on the size of the rod, the size of the mounting hole, the type of resin used, the degree of adhesion between the rod material and the resin material, etc.

In the above embodiment, the manufacturing of a connecting rod used in a crank device has been explained, but the joint device according to the present invention can be used for general joint devices such as a connecting rod in a retractor device, a link bar in a link device, etc. It can be applied to

[Effect of idea]

As explained above, according to the present invention, by arranging and protruding the small diameter part on the inner periphery of the mounting hole so as to correspond to the slit, the depth of the slit and the distance between the slit and the mounting hole can be adjusted. It is possible to increase the degree of freedom in designing the interposed thick portions and the like.

[Brief explanation of the drawing]

Fig. 1 is an enlarged partial vertical sectional view showing a connecting rod which is an embodiment of the present invention, and Fig.
3 is an enlarged partial vertical sectional view showing the assembled state; FIG. 4 is a partially cutaway side sectional view showing one step of outsert molding in the manufacturing method; FIG. 5 6 is a partial front sectional view showing another process, and FIG. 6 is an enlarged partial perspective view thereof.
FIGS. 7 and 8 are enlarged partial longitudinal sectional views showing other steps, respectively. 1...Rod, 2...Pipe shaped part, 3...Mounting part, 4...Connecting part, 5...Mounting hole (positioned part), 5a...Small diameter part, 6...Groove, 7...Out Cert molding device, 8... Cavity, 10...
Upper mold, 11... Upper mold cavity block, 12
...Cavity recess, 13...Mounting plate, 14...
...Holding block, 15...Guide hole, 16...Stopping pin, 17...Spring, 18...Gate, 19...Runner, 20...Lower die, 21...Lower die cavity block, 22... ... Cavity recess, 23 ... Rod accommodation recess, 24 ... Mounting plate, 25 ... Spacer, 26 ... Holding block,
27... Holding hole, 28... Stopping pin, 29...
... Guide hole, 30 ... Core, 31 ... Positioning member, 32 ... Collar, 33 ... Moving plate, 34 ...
Spring, 35... Push-up rod, 36... Push-up sleeve, 37... Push-down rod, 40... Spherical bearing member (joint member), 41... Slit, 41a... Bottom of slit, 42... Thick part, 43... Spherical shaft (joint member), 44... Seal member.

Claims (1)

[Claims for Utility Model Registration] A circular mounting hole 5 is provided in a flat plate-shaped mounting portion 3 formed on the rod 1, and a spherical bearing member 40 is mounted in this mounting portion 3, with its spherical center being arranged so as to substantially coincide with the center of the mounting hole 5,
This spherical bearing member 40 is outsert molded from resin, and has an opening parallel to the mounting hole 5, and a plurality of slits 41 arranged at approximately equal intervals in the circumferential direction in this opening, forming a spherical bearing member 40. In a joint device in which the spherical shaft 43 is pushed into the spherical bearing part 40 through the opening and is rotatably fitted, the fitting part is respectively opened so as to extend to the vicinity of the maximum diameter of the bearing member 40. 3. A joint device characterized in that a plurality of small diameter portions 5a are disposed on the inner periphery of the attachment hole 5 of No. 3 at positions facing each of the slits 41 and protrude radially inward.