JPH05329721A - Assembling method and assembling device for needle roller - Google Patents

Abstract

PURPOSE:To provide an assembling method to assemble needle rollers in the inner hole of a work such as a pinion gear. CONSTITUTION:A guide bar 17 inserted through a through hole 11 is rotated as vertical needles N are supplied into the funnel-shaped receiving section on the upper part of the through hole 11 of an aligning guide member 10 to vertically align fixed number of needles N on the circumference of the guide bar 17. In this case, the output shaft 16 of a motor 15 and the axis of tone guide bar 17 are made eccentric to each other, and plurality of grooves are provided at the lower end of the guide bar 17. After arrangement, a centripetal chuck members 25a, 25b opening till then are closed to restrict the outer periphery of the needles N for reducing the diameter of the above outer periphery, and a lower shutter member 7 is simultaneously opened as a pushing-in cylinder 18 is lowered, and the needles N are inserted in the annular gap of a work with the upper end of the needles N pressed downward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a needle roller in a pinion gear, for example.

[0002]

2. Description of the Related Art Conventionally, as a device for incorporating a needle roller into a pinion gear or the like, for example, Japanese Patent Laid-Open No. Sho 60 has been proposed.
Devices such as -6313 are known. Then, in this case, a predetermined number of needle rollers are vertically aligned around the centering rod as the insertion jig, and the conical portion at the lower end of the centering rod positions the dummy shaft at the center of the work inner hole while The shutter that supports the needle is opened and the needle is inserted at the same time. On the other hand, in order to smoothly align a predetermined number of needles along the circumference in advance, there is known a device such as Japanese Utility Model Laid-Open No. 2-39828. In this case, a funnel receiving roller guide that surrounds the center guide pin with a predetermined gap is provided, and vertical needles are sequentially supplied to the tapered funnel portion of the roller guide to allow it to slide downward. A predetermined number of needles are arranged around the guide pin while rotating the roller guide around a vertical axis.

[0003]

However, when the needle roller is preliminarily aligned longitudinally along the circumference in advance, when the roller guide for guiding the sliding of the needle is rotated as in the latter example, the vertical posture is obtained. There is a problem that the needle supplied in step 3 tends to tilt while sliding down, so that the subsequent needle may be caught by the tilted needle and cannot be inserted properly, and in order to rotate the roller guide, there is a rotation mechanism. It was easy to get complicated. That is, it is desirable to provide the rotating mechanism in the vicinity of the roller guide. However, for example, a shutter mechanism for supporting the needle supply portion or the needle lower end portion, or a workpiece positioning mounting portion is provided around the roller guide. This is because each mechanism is concentrated, and if an attempt is made to provide the mechanism at a position away from the roller guide while avoiding complication of each mechanism, an extra mechanism such as a transmission mechanism is required.

[0004]

In order to solve the above problems, the present invention provides a method for assembling needle rollers in which aligned needles are assembled in an annular gap of a work. While rotating the guide bar arranged in, a predetermined number of needles are vertically aligned around the guide bar, and then the outer circumference is constrained by a holding member having a diameter that is substantially the same as or slightly smaller than the inner diameter of the annular gap of the work, The end of the needle was pressed for insertion. or,
A guide bar provided above the work and coaxial with the center axis of the work, a drive motor for rotating the guide bar around the axis, and one end side of the needle vertically aligned around the guide bar. A support member for temporarily supporting the needle, and a holding member for restraining the outer periphery of the aligned needles,
In the assembling apparatus including the pushing member that pushes the needle end portion and inserts it into the annular gap of the work, the output shaft of the drive motor and the shaft center of the guide bar are eccentric. or,
A plurality of grooves were formed along the axial direction on the outer circumference of the tip of the guide bar.

[0005]

Operation: The guide bar as the central axis is rotated, and the needle supplied from one location is rotated by the rotation of the guide bar to align a predetermined number of needles around the guide bar and then insert the needle into the annular gap of the work. However, there is no problem that the needle posture tilts when inserting the work, and it can be inserted more smoothly. At this time, if the output shaft of the drive motor for rotating the guide bar and the shaft center of the guide bar are eccentric, eccentric movement (precession) can be caused at the tip of the guide bar, and the needle The effect of carrying around is enhanced. The effect of this turning is further enhanced by providing a groove along the axial direction on the outer circumference of the tip end portion of the guide bar. Also, the mechanism for rotating the guide bar can be simply configured,
Moreover, the position can also select a more suitable position. Also at this time,
After the needles are aligned along the circumference, the outer periphery is restrained by the holding member and inserted into the work, whereby smoothness at the time of inserting the work can be achieved and a problem such as damage to the work can be prevented. In addition, since the workpieces can be aligned with a diameter larger than the annular gap when the needles are aligned, a space is provided and the alignment itself is smooth.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a needle roller assembling method and apparatus according to the present invention will be described with reference to the accompanying drawings.
1 to 3 are overall views of the assembly apparatus of the present invention.
2 is a side view of a part of which is shown in section, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof.

As shown in FIGS. 1 to 3, the needle roller assembling apparatus 1 is slidably engaged with a pair of columns 3a and 3b standing on a base 2 and a slide guide 4 on the base 2. A slide body 5 to be fitted and a work placing portion 6 provided on the slide body 5 are provided, and a pinion gear (hereinafter, referred to as a work W) is positioned and placed on the work placing portion 6. ..

According to the present invention, a predetermined number of needle rollers N are formed in the annular gap formed by the work W and the dummy shaft D inserted in the center of the inner hole of the work W.
In order to assemble, the predetermined number of needle rollers N are vertically aligned above the work W along the circumference and then inserted all at once.

Therefore, a shutter member 7 is provided above the work W as a support member for supporting the lower end of the needle N until a predetermined number of needles N are aligned. The drive source 8 fixed to the base 2 is capable of moving forward and backward. A pair of centripetal chuck members 25a, 25b as holding members, which will be described later, are provided above the shutter member 7 so as to be openable and closable, and the outer circumference of the needles N aligned along the circumference can be tightened or opened. I am trying.

Further, an alignment guide member 10 is provided on the lower portion of the column 3a so as to project toward the front of the work W, and the shutter member 7 is slidable along the lower surface of the alignment guide member 10. At the center of the alignment guide member 10, a through hole 11 having a funnel-shaped upper portion and a vertically lower portion is provided.

The tip of the supply line 13 extending from the needle supply section 12 faces the funnel-shaped receiving section of the alignment guide member 10. The alignment guide member 10
Corresponds to the roller guide of Japanese Utility Model Laid-Open No. 2-39828 described above, and in the same apparatus, the needle is supplied while rotating the roller guide (alignment guide member 10).

By the way, an overhanging member 14 is provided on the upper portion of the column 3a so as to project forward, and a motor 15 is provided on the upper portion of the overhanging member 14. An output shaft 16 of the motor 15 extends downward through the overhanging member 14, and a round bar-shaped guide bar 17 is connected to a lower end of the output shaft 16 via a joint 28.

The guide bar 17 has its axial direction vertical, and its lower end is inserted into the center of the through hole 11 of the alignment guide member 10 and almost up to the vicinity of the upper surface of the shutter member 7. It is extended.

Then, the through hole 11 of the alignment guide member 10
A vertical annular space is formed between the inner peripheral wall of the lower vertical portion and the outer periphery of the guide bar 17, and this gap is approximately the same as or slightly wider than the diameter of the needle roller N. ..

By the way, the centripetal chuck members 25a and 25b as the above-mentioned holding members are slidable in a horizontal plane in a horizontal groove provided below the alignment guide member 10, as shown in FIGS. As shown in the drawing, the semicircular dividing holes 26a and 26b are provided at the center. The configuration of the centripetal mechanism will be described. 4 is a plan view of the centripetal mechanism in a horizontal plane, and FIG. 5 is a partial sectional view of the same in front view.

The centering mechanism includes a parallel chuck unit 27 attached to the alignment guide member 10. The parallel chuck unit 27 includes, for example, a drive cylinder that reciprocates left and right in the figure, and the centering chuck member 25.
a and 25b are connected to the drive cylinder via a cam mechanism incorporated therein.

By the operation of the drive cylinder and the operation of the cam mechanism, the centripetal chuck members 25a and 25b can be opened and closed in the vertical direction of FIG. 4 with the guide bar 17 of FIG. 4 interposed therebetween, and in the closed state, As described above, each of the dividing holes 26a and 26b has a circular shape, and has a diameter substantially the same as or slightly smaller than the diameter of the annular gap of the work W.

Further, as shown in FIG. 1, a push-in cylinder 18 which slidably moves up and down along the guide bar 17 is annularly mounted at an intermediate portion of the guide bar 17 and is urged downward by a spring 19. Has been done.

A cylinder unit 21 for vertically moving the push-in cylinder 18 is attached to the upper portion of the column 3b. That is, the lower end of the cylinder rod of the cylinder unit 21 is connected to the elevating body 23 that engages with the vertical rail 22 of the column 3b, and the connecting member 24 connected to the elevating body 23 is integrally connected to the pushing cylinder 18. ing.

By the way, the axis of the output shaft 16 of the motor 15 and the axis of the guide bar 17 are eccentrically connected by the joint 28.

That is, as shown in FIG. 6, the joint 28 is provided with an output shaft connecting hole 30 into which the output shaft 16 can be inserted and a guide bar connecting hole 31 into which the guide bar 17 can be inserted. And these connecting holes 3
The output shaft 16 and the guide bar 17 are inserted into 0 and 31, respectively, and each of them is fixed with two tightening screws 32 and 32. For example, the output shaft connecting hole 30 and the guide bar connecting hole 31 are The diameters are made different and fixed with tightening screws 32, 32.

Therefore, the output shaft 16 and the guide bar 17, which are connected by the joint 28, are eccentrically attached to each other, and the motor 15 drives the guide shaft 17 so that the guide bar 17 has a tip portion (lower end portion). Can cause a rubbing movement.

As shown in FIG. 5, the lower end portion of the guide bar 17 has a stepped shape, and the tip end from the stepped portion 17a is formed as a small diameter portion 17b, and a portion having a large diameter near the stepped portion 17a is formed. , A plurality of slit grooves 33 extending in the axial direction are provided at the tip of the small diameter portion 17b.

In the case of the embodiment, as shown in FIG.
Each of the slit grooves 33, ... Has a total of eight grooves at intervals of 45 degrees along the circumferential direction.

The stepped portion 17a is located at a position of the through hole 11 of the alignment guide member 10 that is located at the boundary between the generally funnel-shaped receiving hole and the vertical hole, and slides down the funnel-shaped receiving hole. The slit groove 33 near the stepped portion 17a faces the portion where the needle N that comes into contact with the guide bar 17 first.

Therefore, the effect of rotating the needle N is enhanced by the slit grooves 33, ....

Next, an assembling method by the above assembling apparatus 1 will be described.

First, the slide body 5 is pulled out to position the work W and the dummy shaft D on the work mounting portion 6, and an annular gap for inserting the needle roller N is formed in the work W inner hole. When the positioning is completed, the slide body 5 is moved to be positioned below the alignment guide member 10.

Next, a predetermined number of needles N are supplied from the needle supply unit 12 and are aligned on the circumference of the work W.
That is, the shutter member 7 blocks the through hole 11 of the alignment guide member 10 and the annular gap of the work W,
The vertically oriented needles N are sequentially supplied from the funnel-shaped receiving portion above the through hole 11. At this time, the motor 15 is simultaneously driven to rotate the guide bar 17 to perform the operation. At this time, the centripetal chuck members 25a and 25b are set in the open position as shown by the chain line in FIG.

Therefore, the supplied needles N are slid down the tapered surface of the alignment guide member 10 and are rotated at the final stage of contact with the guide bar 17, and are sequentially aligned neatly on the circumference. go. Since the rotation is started at the time when the needle roller N substantially enters the vertical portion below the through hole 11, it is possible to prevent the needle roller N from falling down. That is, in the vertical portion below the through hole 11, the space in which the needle N falls is limited.

Further, as described above, in addition to the precession of the lower end portion of the guide bar 17, a plurality of slit grooves 33, ... As a result, a predetermined number of needles N can be arranged in an orderly manner.

Then, when a predetermined number of needles N are aligned on the circumference, the rotation of the motor 15 is stopped, and thereafter, the drive cylinders of the parallel chucks are operated to operate the centripetal chucks 2.
5a and 25b are closed to constrain the outer periphery of the lower end of the needle N. That is, the lower ends of the needles arranged in a circle are reduced in diameter so that they easily enter the annular gap of the work W, and at the same time, the work W
Prevent problems such as scratches on the body.

After that, the cylinder unit 21 is actuated to lower the push-in cylinder 18 and the lower end of the push-in cylinder 18 comes into contact with the upper end of the needle N almost at the same time.
And the needle N is dropped all at once into the annular gap of the lower hole of the work W. At the same time, the push-in cylinder 18 is also continuously lowered to ensure reliable insertion.

When the assembly is completed in this way, the slide body 5 is pulled out and the work W is taken out. Instead of the centripetal chuck members 25a and 25b as described above, the lower end side of the vertical portion below the through hole 11 of the alignment guide member 10 is narrowed down to a small diameter, and the diameter of the portion narrowed down to this small diameter is the work W.
The annular gap may be substantially the same as or slightly smaller than the annular gap.

[0035]

As described above, in the assembly of the needle roller of the present invention, when the predetermined number of needles are previously aligned along the circumference, the guide bar as the central axis is aligned while rotating. Unlike the conventional case, there is no problem that the needle falls over during alignment, and problems such as defective insertion can be suppressed. In addition, the rotation mechanism of the guide bar can be simply constructed. At this time, the output shaft of the motor and each axis of the guide bar are eccentric to cause the precession movement like a rasping at the tip of the guide bar. You can arrange them neatly. Further, by providing a plurality of grooves along the axial direction at the tip of the guide bar, the effect of rotating the needle can be further enhanced. Further, by restraining the outer peripheral portion of the needles aligned along the circumference with the holding member, the needle is inserted into the work,
It is possible to facilitate the insertion into the work, and moreover, the alignment itself has an effect that it has a space in terms of space and is smooth.

[Brief description of drawings]

FIG. 1 is a side view in which a part of an assembling apparatus is shown in section.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a cross-sectional view of the centripetal mechanism.

FIG. 5 is a partial sectional view from the front view.

FIG. 6 is an enlarged sectional view of a joint connecting the output shaft and the guide bar.

FIG. 7 is a cross-sectional view of the tip of the guide bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Assembly device 7 Shutter member 10 Alignment guide member 15 Motor 16 Output shaft 17 Guide bar 18 Push-in cylinders 25a and 25b Centripetal chuck member 28 Joint 33 Slit groove W Work N Needle roller

Claims (3)

[Claims] 1. A method of assembling a needle roller in which aligned needles are assembled in an annular gap of a workpiece, the method comprising: being provided above the workpiece and coaxial with a central axis of the workpiece. While rotating the guide bar, a predetermined number of needles are vertically aligned around the guide bar, and then the outer periphery is constrained by a holding member having a diameter that is substantially the same as or slightly smaller than the annular gap of the work,
A method for assembling a needle roller, characterized in that the needle end is pressed and inserted into the annular gap of the work. 2. A needle roller assembling device, in which aligned needles are assembled in an annular gap of a work, the device being provided above the work and coaxial with a central axis of the work. A guide bar,
A drive motor that rotates the guide bar around the axis, a support member that temporarily supports one end side of the needle vertically aligned around the guide bar, a holding member that constrains the outer periphery of the aligned needle, and a needle. A needle roller assembling apparatus comprising: a pushing member that pushes an end portion of the work into an annular gap of a work, and eccentric the output shaft of the drive motor and the shaft center of the guide bar. 3. The needle roller assembling apparatus according to claim 2, wherein a plurality of grooves are formed along the axial direction on the outer periphery of the tip end portion of the guide bar.