JP3498083B2 - A method of attaching a balance piece using welding means around a shaft on which a balance piece cannot be attached by welding - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching a balance piece for welding a balance having a shaft, such as a propeller shaft, by welding.

[0002]

2. Description of the Related Art Conventionally, in order to balance the rotation of such a propeller shaft, it has been common to weld a balance piece directly to the peripheral surface of the propeller shaft itself.

[0003]

However, recently, due to material innovation, a rotating body having a shaft is often manufactured from a material to which a balance piece cannot be attached by welding.

Therefore, an object of the present invention is to attach a balance piece by welding to a shaft of a rotating body made of a material to which the balance piece cannot be attached by welding, and to a portion where it is difficult to attach the balance piece by welding. To get a balance piece attachment method that allows you to.

[0005]

To achieve this object, in the balance piece mounting method according to the present invention,
A balance-shaped strip can be welded around the shaft of a rotating body that has a shaft to which a balance-piece cannot be attached by welding, and a band with a length slightly shorter than the circumference of the shaft can be wound around and temporarily fixed. Then
Balance measurement is performed in a temporarily fixed state, and the gap between the opposing ends of the band is bridged at the appropriate position with an appropriate balance piece, and each end of the balance piece is welded to the end portion that abuts the band. It is characterized by comprising. Further, as the means for temporarily fixing, for example, the side edges on both sides of the band are bent inward toward the winding surface side, and the bent portion is excluded from the circumferential surface of the shaft around which the band is wound. It is preferable that an annular groove having a width slightly smaller than the width of the band is provided, and the spring action of the bent portion of the band presses the annular groove to the side wall of the annular groove of the shaft to cause temporary fixing. Further, it is preferable that at least a part of the edge of the bent portion of the band is formed in a sawtooth shape, and in addition, the welding of the balance piece is more preferably performed by spot welding.

[0006]

According to this mounting method of the present invention, the balance piece performs not only the function of balancing the rotating body but also the function of tightening the band around the shaft, which makes it difficult to mount the balance piece. Securely fixed to the body shaft.

[0007]

The preferred embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows an embodiment in which the method of the present invention is applied to a part of a drive shaft 2 having a yoke 1 of a universal joint as a rotating body.

According to the method of the present invention, a band 4 capable of welding a balance piece for welding a strip-shaped balance piece 3 as shown in FIG. 1A is wound around the peripheral surface of the shaft 2. The length of the band 4 is slightly shorter than the circumference of the shaft 2. This band 4 is wound around the peripheral surface of the shaft 2 and temporarily fixed, and the balance is measured in the temporarily fixed state, and the gap between the ends 4a and 4b of the band 4 facing each other is bridged at an appropriate position by the appropriate balance piece 3. Then, the respective ends of the balance piece 3 are welded to the vicinity of the ends 4a and 4b which abut on the band, for example, by spot welding (spot welding points are indicated by reference numeral 5).

In the preferred embodiment, as shown in FIG. 1 (b), the side edges on both sides of the band 4 are bent inward toward the winding surface side, and the band of the shaft 2 is wound around the circumferential surface. Provides an annular groove 6 having a width slightly smaller than the width of the band excluding the bent portion 4c, and presses the side wall 6a of the annular groove of the shaft by the spring action of the bent portion 4c of the band to temporarily fix it. Further, the temporary fixing can be reinforced by other temporary fixing means.

Furthermore, in the preferred embodiment, the edge of the bent portion 4c of the band is serrated as shown in FIG. With this serrated edge, the gripping force on the peripheral surface of the shaft 2 is improved, and relative rotation of the band with respect to the rotating body during temporary fixing and after welding the balance piece can be reliably prevented.

[0012]

According to the method of the present invention, by winding a band on which a balance piece can be welded around a shaft of a rotating body, a shaft of a rotating body made of a material in which the balance piece cannot be attached by welding, In addition, welding makes it possible to easily attach the balance piece to a place where it is difficult to attach the balance piece.

[Brief description of drawings]

FIG. 1 shows an embodiment in which the method of the present invention is applied to a part of a drive shaft having a universal joint yoke as a rotating body, (a) is a side view of the shaft, and (b) is an ellipse A of (a). It is an expanded longitudinal cross-sectional view of the portion shown.

FIG. 2 is a perspective view of a preferred embodiment of a band capable of welding a balance piece used in the method of the present invention in a wound state.

[Explanation of symbols]

1 York 2 shafts 3 balance pieces 4 bands 4a, 4b band end 4c bent part 5 spot welds 6 annular groove

Claims (4)

(57) [Claims] 1. A band in which a strip-shaped balance piece can be welded around a shaft of a rotating body having a shaft to which a balance piece cannot be attached by welding and which has a length slightly shorter than the circumferential length of the shaft. The wire is wound around and temporarily fixed, and the balance is measured in the temporarily fixed state, and the gap between the ends of the band facing each other is bridged at an appropriate position with an appropriate balance piece, and each end of the balance piece is brought into contact with the band. A method of attaching a balance piece using welding means to the periphery of a shaft where the balance piece cannot be attached by welding, characterized in that the balance piece is welded to the end portion. 2. The side edges on both sides of the band are bent inward toward the winding surface side, and the circumferential surface of the shaft around which the band is wound is slightly smaller than the width of the band excluding the bent portion. 2. A periphery of a shaft to which a balance piece cannot be attached by welding according to claim 1, wherein an annular groove having a width is provided, and a spring action of a bent portion of the band causes pressure contact with a side wall of the annular groove of the shaft to cause temporary fixing. A method of attaching a balance piece to the body using welding means. 3. The balance piece is attached by welding means around the shaft where the balance piece cannot be attached by welding according to claim 2, wherein at least a part of the edge of the bent portion of the band is formed in a sawtooth shape. Method. 4. The balance piece is welded around the shaft where the balance piece cannot be attached by welding according to any one of claims 1 to 3, wherein the balance piece is welded by spot welding. How to install.