JPS5928742Y2 - Assembly equipment with double ball bearing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly device for a double ball bearing structure, such as a bicycle body.

More specifically, the present invention has a double ball bearing structure, which has a crown that can be placed coaxially with the inner screw cap facing backwards and prevents it from freely rotating, and whose outer diameter is smaller than the inner diameter on the outer screw cap side. It has a support body, a guide shaft protruding coaxially upward from the rotary support body, and an upper edge on which the outer can be placed coaxially with the rotary support, and in a free state, there is a guide shaft between the outer and the screw cap. The outer part is supported above the screw cap so that the ball has a space in which it can freely move, but it is ringed around the outer periphery of the rotary support so that when pressed down, the screw cap lowers at least to a position where the screw cap can be screwed into the inner part. The outer stand is vertically disposed coaxially above the outer stand placed on the outer stand so as to be able to go up and down, and has an upper part having one or more ball supply ports and an outer part slightly smaller than the minimum inner diameter of the outer. A ball supplying tool having a cylindrical lower part having a guide hole into which a guide shaft can be inserted by T force at the bottom part thereof with a diameter, and a ball outlet communicating with the ball supply opening in this cylindrical lower part. The present invention relates to an assembly device for a dual ball bearing structure.

The double ball bearing structure referred to here consists of a hollow inner shaft (inner), an outer shaft (outer) that fits around the outer periphery, and the outer shaft is screwed into the inner via balls from both sides of the same shaft so as to lock the outer into the inner. Basically, it has a screw cap.
This is a bearing structure in which a ball bearing mechanism is constructed on both the left and right sides of the outer, allowing smooth rotational movement between the outer and inner.

For example, a bicycle rear wheel support shaft mechanism (hereinafter referred to as a hub body) is used.

) is a typical bearing structure.

Incidentally, among the above-mentioned screw caps, the one with a negative force may be integrated with the inner.

Therefore, in the following explanation, the double ball bearing structure will be represented by the hub body of the rear wheel of a bicycle, but the present invention is not limited to this, and can be applied to all bearing structures having the above structure. It is applicable.

To give a concrete example, the hub body of the rear wheel of a bicycle consists of parts as shown in Fig. 1, namely, an inner wheel 1, a left ball 2,
(In the diagram, this refers to the upper and inner balls), outer 3,
The right ball 4 (lower side in the figure), adjustment plate 5, and screw phthalo are assembled in the relationship shown in the figure.

A simple step-by-step explanation of this conventional assembly work is as follows: (1) The upper ball groove 7 of the outer 3 and the lower ball groove 8 provided inside are filled with a thick layer of grease.

(il) A predetermined number (usually several tens) of balls 2, 4 are buried in this grease layer.

The balls adhere to the ball grooves due to the adhesive force of the grease, and once they are buried in the ball groove, they will not be separated even with a little effort.

(11D) Layer an appropriate number of adjustment plates 5 and screws, insert them into the outer from below, and screw them together with the inner inserted from above.

With the above steps, a hub body assembled integrally as shown in FIG. 2 is obtained.

Conventionally, assembly of such a hub body has been carried out exclusively by hand.

As a result, production efficiency was low, and even if the work was performed by skilled workers, sufficient work efficiency could not be achieved.

Incidentally, the number of hub bodies assembled by a skilled person is approximately 50 per hour.

Among these processes, the process of burying the balls in the outer ball groove requires a great deal of time and effort, as the balls are small and easily roll and are difficult to handle, and there are dozens of balls. It has been a strong desire of those skilled in the art to improve at least this process alone.

The inventor of the present invention conducted intensive research in view of the above situation, and as a result, he came to the completion of a device that can assemble a bicycle hub body with high production efficiency without requiring any skill.

That is, the features of the present invention, to put it simply, are that it is equipped with a ball supply tool, a rotation support body that includes the supply tool, an inner attachment guide shaft, and an outer stand, and on which a screw lid can be placed. This allows the ball to be placed in the outer predetermined position (
It can be automatically introduced into the ball grooves on both sides, and the inner and screw cap can be easily screwed together.

Hereinafter, the guide shaft, outer stand, and support will be referred to as a pedestal.

To explain these features in more detail, first, the pedestal part rotates and holds the screw cap and the outer part.

The ball supply tool is vertically installed above these, and approaches and enters the upper part of the outer to supply balls.

That is, when the ball supply device is pulled down and balls are supplied from the upper ball supply port, the balls roll out from the lower ball outlet communicating with this and are deposited in the corresponding ball grooves.

After that, pull up the ball supply tool, insert the inner into the outer along the guide shaft, and press down to loosen the screw cap. Since the screw cap is rotating, it can be automatically screwed together.

The outer stand is configured such that the outer is pushed down together with the inner.

This invention will be described in detail below based on the embodiment shown in FIGS. 3 and 4.

Note that this invention is not limited by this.

First, FIG. 3 shows the rotary support 9, guide shaft 10, outer stand 11, and ball feeder 21 of the device of this invention.

The top portion 12 of the rotary support 9 has a convex surface that conforms to the shape of the front side of the screw cap 13.

The pin 14 passes through the guide shaft 10 and is inserted horizontally into the crown part 12, and is inserted into the tightening groove (54, see Fig. 1) of the screw cap.
The screw cap 13 plays a role of stopping the screw cap 13 from rotating freely.

The pin 14 also serves to prevent the guide shaft, which will be described later, from coming off.

The guide shaft 10 is coaxially and slidably inserted into a hole provided in the rotary support body 9, and is supported by a coil spring 15 and biased upward.

Furthermore, the guide shaft 10 has an elongated hole 26 near the center,
The pin 14 is inserted.

The outer stand 11 is biased upward by a coil spring 17 mounted on a flange 16 of the rotary support, and is locked by a pull-out stop plate 18.

The outer side of the upper end edge 19 is raised one step higher to prevent the outer 20 from shifting laterally, thereby holding the outer 20 coaxially.

The ball supply tool 21 has a guide hole 23 in the bottom portion 22,
At least in the range where the guide shaft 10 and the guide hole 23 fit together, it is held vertically above the outer 20 so as to descend and rise coaxially.

In the upper part 24 there is a ball supply opening 25,26 and a grease inlet 27.

The lower part 28 is a cylinder with an outer diameter slightly smaller than the minimum inner diameter of the outer so that it can be inserted into the outer 20.
Ball outlet 29 corresponding to said ball supply port 25,26
30 and a grease outlet 31,32 corresponding to said grease inlet 27.

The upper portion 24 and the lower portion 28 are joined together via a sloped portion 46 of approximately 30 degrees.

A protrusion 33 is provided in a portion of the bottom portion 22 .

This is for dropping the ball riding on the flat part 34 of the screw cap 13 into the ball groove 35.

Next, a more detailed configuration will be explained following the operational procedure of this embodiment.

First, in FIG. 3, it is assumed that the ball supply tool 21 has been pulled upward.

Place the screw cap 13 on the top portion 12 of the rotary support 9 face down.

The screw cap 13 is fitted with the pin 14 and rotates in the same manner as the rotary support 9.

When deemed necessary, an adjustment plate 36 is placed on top of this.

Next, the outer 20 is placed on the outer stand 11.

Since the outer stand 11 rotates in the same way as the rotary support 9 due to the frictional force with the rotary support 9, the outer 20 placed on it also rotates in the same way.

The ball supply tool 21 is lowered here, and its lower part 28 is inserted into the outer.

Next, a predetermined number of balls are fed into the ball supply ports 25 and 26.
If the balls are fed more naturally, they will come out of the ball outlets 29 and 30 and fit into the ball groove 37 on the upper side of the outer 20 or the ball groove 35 of the screw cap.

One purpose of rotating the outer 20 and screw cap 13 is to allow the ball to fit smoothly into the groove.

The aforementioned protrusion 33 on the bottom portion of the ball feeder 21 is also provided for this purpose.

In other words, the ball on the flat portion 34 is shot down into the ball groove 35 by the protruding portion 33 .

Furthermore, the following configuration is made for this purpose.

([) The outer 20 has a space in which the ball can move freely between the outer and the screw cap 13 in a free state.
An outer stand 11 is provided at a higher supporting position.

This is to move the ball exiting from the lower ball outlet 30 to the ball groove as naturally as possible.

(1i) The outer diameter of the rotary support 9 is slightly smaller than the inner diameter of the outer 20 on the screw lid side.

This is because if the outer diameter is too large, the inner diameter of the outer stand 11 will also become larger, and the ball will fall between the screw cap 13 and the inner wall 38 of the outer stand.

Therefore, the outer diameter of the rotary support 9 must not exceed the length of the screw cap 13 outer diameter plus the ball diameter.

It is preferable that the diameter is slightly smaller than the inner diameter of the outer 20 on the screw lid side as in this embodiment.

(11D The outer diameter of the guide shaft 10 in the free state near the top of the rotary support body 40 is slightly smaller than the inner diameter of the screw hole of the screw cap 13.

This is because if the inner diameter of the screw hole of the screw cap 13 is too small, a gap may be created between the screw cap 13 and the guide shaft 10, and the ball may fall into it.

Further, in this embodiment, the function of coaxial centering of the screw cap 13 and the adjustment plate 36 also functions, so this is done.

Although not shown in this embodiment, if auxiliary means such as slightly cutting the edge of the ball outlet 29 in the direction of the rotational force or slightly vibrating the outer stand are used, the balls can be fed even more smoothly. It will be.

Now, once the ball is seated in the ball groove, grease is injected from the injection port 27.

Grease is heated and pressurized appropriately, and is jetted out from the grease injection ports 31 and 32 by opening a valve (not shown).
Each ball groove 37 towards which an injection port 31, 32 is directed
．． It attaches to 39.

Of course, since the outer part is rotating, it won't bunch up in one place.

When the supply of balls and grease is completed as described above, the ball supply tool 21 is pulled upward.

The reason why the upper and lower connecting parts 46 of the ball supply tool have an inclination of approximately 30 degrees is to prevent troubles such as balls sticking to the ball during this pulling up.

Next, the procedure after pulling up the ball supply tool 21 will be explained with reference to FIG.

While inserting the guide shaft 10 into the pipe 41, the inner 42 is pushed down from above the outer 20 while being held so as not to rotate.

The diameter of the tip 43 of the guide shaft 10 is therefore slightly smaller than the inner diameter of the pipe 41.

As it is further pressed down, the ball hits the ball groove 44 of the inner 42, and the ball passes through the ball to the outer 20 and the outer stand 1.
1 is pressed down.

Since the central portion 40 of the guide shaft 10 is thick, the threaded portion 45 of the inner member 42 comes into contact with it and pushes down the guide shaft 10.

In this way, the threaded portion 45 eventually deteriorates into the threaded cap 13.

On the other hand, the screw cap 13 rotates together with the rotary support 9 as described above, and the screw portion 45 of the inner 42 does not rotate after all.
It will be screwed together.

When the inner 42 and the screw cap 13 are completely screwed together in this manner, the inner 42 tries to rotate in the same manner as the rotation support 9, and a strong rotational force acts on the inner 42.

At this time, when the inner 42 is pulled up, the assembled hub body is obtained.

All operations in this example can be performed by automatic machines.

Further, only specific parts can be performed by automatic machines.

The present inventor conducted an experiment in which balls and grease were automatically supplied by operating a switch, and other operations were performed by hand, and he was able to assemble about 180 pieces per hour.

As mentioned above, the number of pieces assembled per hour by a conventional expert is approximately 5.
Considering that there were 0 pieces, the efficiency was increased by 260 t, and the fatigue was also mild.

Although the hub body shown in FIGS. 1 and 2 is an example of a hub body for a multi-speed gear, there are also hub bodies having other shapes.

For example, there is a hub body that does not include a gear plate for transmitting speed change rotation, and it goes without saying that such a device can be applied to the assembly of such a hub body.

To illustrate a configuration other than the embodiment shown in FIGS. 3 and 4,
As shown in FIG. 5, even if the ball supply tool 52 is a single cylinder with an outer diameter slightly smaller than the minimum inner diameter of the outer, and the ball outlet is one small opening on the outer periphery near the bottom. good.

In this case, the ball supply tool is stopped at two coaxial positions, and the upper and lower balls of the outer are separately supplied accordingly.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a bicycle hub body that is an example of a double ball bearing structure, Fig. 2 is a perspective view of the hub body shown in Fig. 1, and Figs. FIG. 5, which is a cross-sectional view of one embodiment of the assembly apparatus of the dual ball bearing structure, is an explanatory diagram showing the operating procedure of another embodiment. 1.42...Inner, 2,4,50...
・Ball, 3.20...Outer, 6,13...
...Screw lid, 51.52...11 pieces,
9... Rotating support body, 12... Parietal part,
10... Guide shaft, 11... Outer stand,
19...Top layer edge, 21.52...Ball supply tool, 22...Bottom part, 23...
・Guide hole, 24...Top, 25.26,53・
... Ball supply port, 28 ... Lower part, 29
,30...Ball exit.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) In a double ball bearing structure, the inner screw cap is placed face down and coaxially so as not to rotate freely, and has a crown of the crown, and the outer diameter is the inner diameter on the outer screw cap side. (b) a guide shaft coaxially protruding upward from the rotary support; and (c) an upper edge on which the outer can be placed coaxially with the rotary support; In this state, the outer is supported above the screw cap so that there is space for the ball to move and slide between the outer and the screw cap, but when pressed down, the screw cap at least lowers to a position where it can be screwed into the inner. (d) Coaxially above the outer mounted on the outer stand,
It is vertically installed so that it can rise and fall, and has an upper part with one or more ball supply ports and a circular guide hole with an outer diameter slightly smaller than the minimum inner diameter of the outer, into which a guide shaft is inserted from below into the bottom part. 1. An assembly device for a double ball bearing structure, comprising: a ball feeder having a cylindrical lower portion integrally with a knotted lower portion and a ball outlet communicating with the ball feeding port.