JPH0539179Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an improvement in the bearing structure of a rotary drive pulley in a drive section of a cable-type window regulator equipped with a spring spring for rotational balance.

``Prior Art'' An example of a bearing structure for a rotary drive pulley in a drive section of a window regulator equipped with a mainspring spring for rotational balance is shown in FIG. 9, for example.

That is, the housing 1 is formed by a main plate 2 and a cover plate 3, and a drive pulley 4 around which a cable is wound around a storage space between the main plate 2 and cover plate 3 and a mainspring spring 5 for rotational balance are generally shown. The drive shaft 6, to which the drive pulley 4 is fixed, is installed concentrically inside the main plate 2.
It is constructed between a front wall 2a formed by a part of the cover plate 3 and a rear wall 3a formed by a part of the cover plate 3.

The rear end of the drive shaft 6 is made of a metal bearing member 7.
It is supported by the rear wall 3a via. Bearing member 7
is disposed inside the rear wall 3a, the inner end of the mainspring spring 5 is hooked thereto, and a caulking projection 7a at the rear end of the bearing member 7 is caulked and fixed to the rear wall 3a.
The caulking projection 7a is formed into an oval-shaped cross section to prevent rotation.

"Problems to be Solved by the Invention" However, in the bearing structure of the drive pulley in the drive section of the conventional window regulator, since the bearing member 7 is a metal component, the manufacturing cost due to machining etc. is high. Also, a caulking process is required during assembly, which increases costs, and since the drive shaft 6 and the bearing member 7 come into metal contact, they are prone to wear and the operating feeling deteriorates over a long period of time. .

The present invention was developed by focusing on these conventional problems, and has developed a bearing structure for the drive pulley in the drive section of a window regulator that solves the above problems by making it possible to use resin parts as the bearing. is intended to provide.

``Means for Solving the Problems'' The gist of the present invention to achieve this purpose is to provide a bearing structure for a drive pulley in a drive section of a window regulator equipped with a spring spring for rotational balance. In the housing, a drive pulley around which the cable is wound is pivotally supported by a drive shaft, and a mainspring spring for rotational balance is housed approximately concentrically, and the drive shaft is supported by the housing via a resin bearing bush. The bearing bush is provided with a tail portion that non-rotatably fits into a fitting hole formed in the housing, an enlarged portion for preventing slipping off that comes into contact with the inside of the housing, and an inner end of the mainspring spring that engages with the tail portion. A core portion having a locking groove for locking is provided, the diameter on the side where the locking groove is located is larger with respect to the center of the core portion, and the drive shaft is rotatable from the core portion to the tail portion. The present invention relates to a bearing structure for a drive pulley in a drive section of a window regulator, characterized by having a bearing hole that fits into a bearing hole.

"Operation" Thus, the resin bearing bush can be installed simply by fitting the tail part to the rear wall of the housing, and the lateral load of the drive shaft is supported by the rear wall of the housing via the tail part. Since they are simply fitted together in a non-rotatable manner, there is no need for fixing processes such as caulking.
The bearing bush does not rotate due to the rotational reaction force of the mainspring spring. The wide side of the widening part contacts the inside of the housing, so the bearing bushing does not fall over and maintains a stable posture.Since the bearing hole is eccentric to the core, it can be adjusted to match the shape of the mainspring. The mainspring can be stored without making the core part unnecessarily thick. A bearing hole is drilled from the core to the tail so that the drive shaft can be rotatably fitted, so the load of the drive shaft can be transferred from the tail to the housing and held, resulting in high support rigidity and strength. Since the drive shaft of the drive pulley is supported by a resin material, it rotates stably, is resistant to wear, has improved durability, and can maintain good feeling for a long time.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

1 to 8 show an embodiment of the present invention.

As shown in FIG. 3, a window regulator 20 is attached to the door 10, and the window regulator 20 raises and lowers the window glass 11.

The window regulator 20 includes a guide rail 21 disposed along the vertical trajectory of the window glass 11 and a drive section 30, and a carrier plate 22 to which the window glass 11 is fixed.
is mounted so as to be raised and lowered guided by the guide rail 21, and a drive cable 23 connected to the carrier plate 22 is stretched between the upper and lower sides of the guide rail 21 and the drive section 30.

As shown in FIGS. 1, 2, and 4, the drive unit 30 includes a drive pulley 50 around which the drive cable 23 is wound and a balance spring 60 housed in a housing 40.

The housing 40 has a cover plate 45 attached to a mounting plate 41 by burring caulking 40a, 40a...
They are fixed together to form a storage space between them.
Housing 4 formed by a part of mounting plate 41
A boss 43 is provided to protrude from the front wall 42 of 0. A drive shaft 70 is installed across the boss 43 and the rear wall 46 of the housing 40, which is a part of the cover plate 45, and the drive pulley 50 is pivotally supported by the housing 40 via this drive shaft 70.

The drive pulley 50 has a winding groove 52 for the drive cable 23 carved on the outer periphery of the pulley body 51, a hub boss 54 that fits into the boss 43 of the front wall 42 of the housing 40 protrudes, and a balance spring 60 at the rear. A storage section 55 is formed.

The housing portion 55 is formed by a circular recess bored in the rear part of the drive pulley 50, and the center of the circle is eccentric from the axis of the drive pulley 50, and the side wall 56 has a thin wall on one side 56a and a thick wall on the other side 56b. A notch 57 for engaging the outer end 61 of the mainspring spring 60 for balance is carved in the thick side wall 56b.

The mainspring spring 60 for balance is a wound plate spring material, and is housed in the storage part 55 of the drive pulley 50, and the outer end 61 is bent into a key shape and engaged with the notch 57 of the drive pulley 50. , the inner end portion is formed to wrap around the axis of the drive pulley 50, and the inner end portion 62
is bent inward approximately in the normal direction.

The drive shaft 70 passes through the inside of the drive pulley 50, and a front bearing shaft part 72 which is thicker than the fixed shaft part 71 of the drive pulley 50 is formed in front of the fixed shaft part 71, and a serration shaft part 73 is provided at the front end. Front bearing shaft part 72
is rotatably supported in a burring hole 44 provided in a boss 43 of the front wall 42 of the housing 40, and a hand handle (not shown) is attached to the serration shaft 73.

A drum 74 constituting a reverse rotation prevention mechanism is fixed to the front end of the front bearing shaft portion 72 so as to be located inside the boss 43, and a coil spring 7 is installed between the drum 74 and the boss 43.
5 is wrapped. The rear end portion of the drive shaft 70 forms a rear receiving shaft 76.

The rear bearing shaft 76 of the drive shaft 70 is rotatably supported on the rear wall 46 of the housing 40 via a bearing bush 80.

As shown in FIGS. 1, 2, and 4 to 8, the bearing bush 80 includes a flange 83 integrally molded with resin between a core portion 81 and a tail portion 82. The rear receiving shaft 7 of the drive shaft 70
A bearing hole 8 into which 6 fits and rotatably supports it.
4 is drilled.

The bearing hole 84 is eccentric with respect to the core part 81,
A locking groove 85 for hooking the inner end 62 of the mainspring spring 60 for balance is carved in the thick wall of the cylinder. The core portion 81 has a larger diameter than the tail portion 82, and the step created by the difference in diameter constitutes an expanded portion for preventing slippage.

The tail portion 82 has a keyhole-shaped outer periphery with a rotation prevention protrusion 86 protruding in the normal direction, and a keyhole-shaped fitting hole 47 into which the tail portion 82 fits is bored in the rear wall 46 of the housing 40. It is set up.

The flange 83 cooperates with the step created by the difference in diameter between the core part 81 and the tail part 82 to form an expanded part for preventing the rear wall 4 of the housing 40 from coming off.
6 is provided with a fitting portion 48 that makes the entire surface of the flange 83 flush with the general inner surface of the rear wall 46.

In the assembled state, the rear receiving shaft 76 of the drive unit 70 has the tail portion 8 of the bearing bush 80 between its end and the edge of the keyhole-shaped fitting hole 47 of the rear wall 46 of the housing 40.
It is inserted into the bearing hole 84 up to the position where the side wall of No. 2 is present.

Next, the effect will be explained.

To assemble the drive section 30, the drum 74 is fixed to the drive shaft 70, a coil spring 75 is wound around the drum 74, a reversal prevention mechanism is attached, and the drive shaft 70 is inserted into the drive pulley 50. Also, the drive pulley 50
A mainspring spring 60 for balance is stored in the housing portion 55 of the housing, the outer end 61 is engaged with the notch 57, and the rear receiving shaft 76 of the drive shaft 70 is inserted into the bearing hole 84 of the bearing bush 80.
, and the inner end 62 of the balance mainspring spring 60 is locked in the locking groove 85.

In the above combination, the drive cable 23 is wound around the winding groove 52 of the drive pulley 50, and the mounting plate 41 constituting the housing 40
The front end of the drive shaft 70 is inserted into the burring hole 44 formed in the front wall 42 of the drive shaft 70 and set on the mounting plate 41.

Next, cover the cover plate 45, fit the tail part 82 of the bearing bush 80 into the keyhole-shaped fitting hole 47 formed in the rear wall 46, and bur ring swab 40a, 4.
The assembly is completed by caulking the mounting plate 41 and the cover plate 45.
The bearing bush 80 is positioned between the rear surface of the drive pulley 50 and the rear wall 46 of the housing 40.

When a hand handle is attached to the serration shaft portion 73 of the drive shaft 70 and the drive shaft 70 is rotated, the drive pulley 50 is rotated via the drum 74, and the drive cable 23 is moved in the vertical direction to move the carrier plate 22. is moved along the guide rail 21, whereby the window glass 11 is raised and lowered to open and close.
The balance mainspring spring 60 balances the operating force against the weight of the window glass 11, and improves operability by preventing large differences in operating force depending on the direction of elevation.

The front part of the drive shaft 70 is pivotally supported on the front wall 42 of the housing 40 by a large diameter front bearing shaft part 72, and the rear part is supported by a small diameter rear bearing shaft 76 on the rear wall 46 of the housing 40 via a bearing bush 80. It is pivotally supported. Since the contact area of the front bearing part is large, the front bearing shaft part 7 can be smoothly attached.
2 rotates, and the rear part is supported through a resin bearing bush 80, which prevents wear.
rotates smoothly.

"Effects of the invention" According to the bearing structure of the drive pulley in the drive section of the window regulator according to the invention, since the drive shaft is supported by the housing via the resin bearing bush, the bearing cannot rotate. Since the tail of the bush fits into the fitting hole of the housing, no fixing process such as caulking is required, and the bearing bush does not rotate due to the rotational reaction force of the mainspring spring. The wide side of the widening part contacts the inside of the housing, so the bearing bushing does not fall over and maintains a stable posture.Since the bearing hole is eccentric to the core, it can be adjusted to match the shape of the mainspring. The mainspring can be stored without making the core part unnecessarily thick. Since a bearing hole is drilled from the core to the tail so that the drive shaft can be rotatably fitted, the load of the drive shaft can be transferred from the tail to the housing and held, resulting in high support rigidity and strength. The bearing part is less likely to wear out and the drive shaft can maintain smooth rotation over a long period of time, improving quality performance and durability. The bearing bush itself has a one-piece structure, which reduces manufacturing costs, and it can be installed simply by fitting it into the fitting hole, so the assembly process can be reduced, and the overall cost can be significantly reduced.

[Brief explanation of drawings]

1 to 8 show one embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view of the drive section of the window regulator, FIG. 2 is a cross-sectional view taken along the line of FIG. 1, and FIG.
The figure is a schematic front view of the door equipped with a window regulator, FIG. 4 is a view in the direction of the arrow in FIG. 1, FIG.
8 is a sectional view taken along the line of FIG. 5, and FIG. 9 is a vertical sectional view of the drive section of a conventional window regulator. 10...Door, 11...Window glass, 2
0... Window regulator, 21... Guide rail, 22... Carrier plate, 23... Drive cable, 30... Drive section, 40... Housing, 47... Fitting hole, 50... Drive pulley , 51
...Pulley body, 55...Storage section, 60...Spring spring for balance, 70...Drive shaft, 80...
... Bearing bush, 81 ... Core section, 82 ... Tail section, 8
3...Flange, 84...Bearing hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A bearing structure for a drive pulley in a drive section of a window regulator equipped with a spring spring for rotational balance, in which the drive pulley around which a cable is wound is pivoted by a drive shaft within a housing. At the same time, a mainspring spring for rotational balance is housed approximately concentrically, the drive shaft is supported by the housing via a resin bearing bush, and the rotation is inserted into the fitting hole drilled in the housing in the bearing bush. A tail portion that is fitted together irreversibly, an enlarged portion that abuts from the inside of the housing to prevent it from coming off, and a core portion that has a locking groove that locks the inner end of the mainspring spring. A window regulator characterized in that the diameter of the side with the locking groove is larger than that of the locking groove, and a bearing hole is bored extending from the core to the tail into which the drive shaft is rotatably fitted. Bearing structure of the drive pulley in the drive section of the rotor.