JPS6263208A - Shape of press-in shaft - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application of the invention] 15 The present invention was molded or die cast.

Concerning improvements to a shaft that is press-fitted into a hole in a board.

Especially when rotating objects are placed on both the upper and lower ends of the shaft.

Regarding the shape of the shaft suitable for the case.

[Background of the invention]

Conventionally, molding is performed as shown in FIGS. 3 to 5.

Press fit the shaft 2 into the molded substrate 1 and fix it.

Attach gear 3 and pulley gear 5 to both ends, and then.

Grooves 2A and 2B provided at the upper and lower ends of the shaft.

There is one that is made by fitting a Rasha or lli IJ song, 6, etc. to prevent both of the above 5 gears from falling. .

Here, the shaft 2 is indicated by an arrow as shown in FIG.

It is press-fitted from the input direction, but when press-fitting, the first

As shown in Figure 5, the edges of the two groovers scrape off a part of the press-fitting allowance while rolling the shavings 7 into the two grooves, and as a result, as shown in Figure 4, the edges of the two groovers 7 I will fill it up. Gi in such a state.

When I tried to install Gear 3, something happened to the bearing part of Gear 3.

A slight amount of shavings 7 has entered the gear, making the rotational movement unsmooth and preventing the insertion of the groove 2AK, washer, or redundant ring 4.5, resulting in a defective gear 3 installation.

There is. Incidentally, this type of shaft is related.

For example, Japanese Utility Model Publication No. 54-40006.

Can be mentioned.

[Object of the invention] 6゜ The object of the present invention is to provide a rotating component in view of the above problems.

to prevent rotation or make it uneven.

It is in providing a shaft with a prevented structure.　　.

[Summary of the invention]

The present invention is a shaft that is press-fitted into a mold or die-cast product, and rotates at both ends of the shaft.

In order to prevent the shavings of the molded product from entering the groove in which the mounting member for attaching the part is inserted, a tapered surface was provided on the portion of the shaft facing the groove [Embodiment of the invention]
+.

Examples of the present invention will be described below based on FIGS. 1 and 2.

I will explain. In the same figure, 1 is a mold or.

Reference numeral 2 indicates a die-cast substrate, and 2 indicates a shaft press-fitted into a press-fitting portion 1 of the substrate.

The tip of the end is formed into a tapered shape. Also, washers 2 are installed at both ends of the shaft 2 to prevent rotating parts from falling after they are attached to the shaft 2°.

Grooves 2A' and 2B' into which E-rings etc. are inserted are formed.

ing. One side of grooves 2A and 2B is a washer]! i
In order to prevent rings etc. from coming off easily, the number of thread faces is slightly 2° or R-shaped, and the corners are set to almost a right angle 2XB.
The other side has a surface larger than the press-fit allowance.

to avoid cutting the press-fit allowance.

The tapered shape 2A'C is formed. by this.

5. It is possible to press-fit the shaft without producing any debris when press-fitting it.

Also, to avoid shaving off the press-fit allowance.

Sufficient press-fit strength is maintained.

〔Effect of the invention〕

According to the present invention, a shaft is press-fitted into a molded product, rotating parts are placed on the upper and lower sides, and the shaft is fixed in a groove of a shaft with a washer or ring of 10 members. Groove on shaft when press-fitting.

The shape is almost perpendicular to the shaft like a conventional groove.

Maybe the edges of both grooves are almost edges.

Regarding the direction in which the washer or E IJ song comes off, 5
The stopping force is sufficient because it has a right-angled edge.

Yes, and the taper surface is press-fitted when the shaft is press-fitted.

Scrape off the material to reduce press force deterioration and shavings.

Enter the groove and place rotating parts on the shaft.

When doing so, debris may get stuck in the bearing of the rotating object and cause it to seize up.

, 3.

There will be no more accidents, which will improve reliability. Also many.

When press-fitting multiple shafts from the same direction at the same time.

A groove is passed through the molded product.

Since it can be passed through the process, productivity can be greatly improved and the industrial effect is great. 5

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a press-fit shaft 7° showing an embodiment of the present invention, and FIG. 2 is a press-fit shaft of the present invention. Figure 3 is a cross-sectional view when the shirt is press-fitted using the conventional method, Figure 4 is a cross-sectional view when the 10 shaft is press-fitted, and Figure 5 shows the shaft press-fitting process. FIG. 1... Board 2... Shaft 3.4
...Rotating parts.

Claims (1)

[Claims] A rotary component is placed on a shaft that is press-fitted into a substrate made of a mold or die-cast product, and a groove is formed in the shaft with a washer or an E-ring to prevent the rotary component from coming off, in which the washer or The corners of the groove on the side that prevents the E-ring from coming off are made approximately right angles, and the corners of the groove that come into contact with the other rotating component are provided with a tapered surface to prevent the press-fitting allowance from being cut. The shape of the press-fit shaft is characterized by a tapered surface at the tip.