JP2009133349A - Balance piece for propeller shaft, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep a welding strength of a balance piece while improving productivity, when the balance piece is welded to a front surface of a propeller shaft. <P>SOLUTION: A balance piece 20 for the propeller shaft, which is welded to a front surface of a propeller shaft 10, is formed by coating an insulator 23 to a periphery of a projection 22 for welding in a rear surface of a balance piece body 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a propeller shaft balance piece that transmits engine output to drive wheels, and a method of manufacturing the balance piece.

Conventionally, as a balance piece that is electrically welded to the surface of a propeller shaft in order to suppress vibration caused by rotation of the propeller shaft, there is one described in Patent Document 1. The balance piece described in Patent Document 1 is a portion other than a welding projection on the back surface of the balance piece main body, and an insulator such as rubber or resin is bonded to a portion where the balance piece and the surface of the propeller shaft are in contact with each other. It is affixed using an agent. Since the welding current supplied to the balance piece passes only through the welding projection and does not leak to the propeller shaft from other parts, the balance piece welding projection and the portion of the propeller shaft in contact with this will melt sufficiently. Therefore, the welding strength can be secured.
JP 10-9343

  In the balance piece described in Patent Document 1, the insulator is pasted with an adhesive, and the mounting property is poor.

  The subject of this invention is ensuring the welding strength of a balance piece, improving productivity, when welding a balance piece to the surface of a propeller shaft.

  According to the first aspect of the present invention, in the propeller shaft balance piece welded to the surface of the propeller shaft, an insulator is coated on the periphery of the welding projection on the back surface of the balance piece body. .

  Invention of Claim 2 is the manufacturing method of the balance piece for propeller shafts of Claim 1, Comprising: The process of coating an insulator on the back surface of the plane board used as a balance piece main body, The said balance piece main body is a propeller shaft. And press-molding so as to conform to the curvature of the surface, and also having a step of press-molding the projection for welding.

  Invention of Claim 3 is a manufacturing method of the balance piece for propeller shafts of Claim 1, Comprising: The process of coating an insulator on the whole back surface of a circular pipe, and the circle | round | yen used as a balance piece main body with the said circular pipe It comprises a step of cutting at a circumference and a step of press-forming a welding projection on the balance piece body and piercing the insulator with the welding projection.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the circular tube has a curvature along the surface of the propeller shaft.

(Claim 1)
(a) The balance piece is provided by coating an insulator and has high productivity.

  (b) When the balance piece is placed along the surface of the propeller shaft and is electrically welded, only the welding projection serves as a conductive portion and contacts the surface of the propeller shaft. Therefore, since the welding current supplied to the balance piece passes only through the welding projection and does not leak to the propeller shaft from other portions, the welding projection of the balance piece and the portion contacting the propeller shaft are sufficient. It can be melted to ensure welding strength.

  When only one welding projection is provided on the balance piece, the torsion durability of the propeller shaft can be improved without the balance piece constraining the torsion caused by the torque applied to the propeller shaft.

(Claim 2)
(c) A step of coating an insulator on the back surface of the flat plate serving as the balance piece body, and a step of press-molding the balance piece body along the curvature of the surface of the propeller shaft and at the same time press-molding the projection for welding. The balance pieces (a) and (b) described above can be easily manufactured.

(Claim 3)
(d) a step of painting an insulator on the entire back surface of the circular tube, a step of cutting the circular tube with a circumferential length to be a balance piece body, and press forming a projection for welding on the balance piece body, The balance piece of the above-mentioned (a) and (b) can be easily manufactured by having the step of breaking through the insulator with the welding projection.

(Claim 4)
(e) Since the circular pipe of (d) described above has a curvature along the surface of the propeller shaft, a balance piece along the surface of the propeller shaft can be easily manufactured.

  FIG. 1 is a schematic view showing a propeller shaft, FIG. 2 shows a balance piece, (A) is a cross-sectional view, (B) is a back view, and FIG. 3 is a cross-sectional view showing a state in which the balance piece is welded to the surface of the propeller shaft. 4 is a front view showing a circular tube, FIG. 5 is a balance piece, (A) is a cross-sectional view, (B) is a back view, and FIG. 6 is a cross-section showing a state in which the balance piece is welded to the surface of the propeller shaft. FIG.

  As shown in FIG. 1, the propeller shaft 10 is provided by electrically welding a balance piece 20 to a necessary portion of the surface of the propeller shaft main body 11 to adjust the weight balance in the circumferential direction of the propeller shaft main body 11. Suppresses the vibration caused by the rotation. In addition, the propeller shaft main body 11 has yokes 12A and 12B welded to end portions of cylindrical pipes 11A and 11B such as two aluminum alloys or ERW steel pipes, and the yokes 12A and 12B of both pipes 11A and 11B are welded. The end portions that were not present are friction-welded, and yokes 13A and 13B are attached to both yokes 12A and 12B.

  As shown in FIG. 2, the balance piece 20 has, for example, a rectangular shape in plan view, and is along the surface of the propeller shaft main body 11 (pipe 11A, 11B) by a metal plate piece having a size corresponding to the required weight. A balance piece body 21 having a curvature is formed. The balance piece 20 has a welding projection (projection) 22 protruding substantially at the center of the back surface of the balance piece main body 21, and is insulated with rubber, resin, or the like around the welding projection 22. The body 23 is painted and provided. The insulator 23 is provided on the entire surface of the back surface of the balance piece main body 21 excluding the welding projection 22. However, the insulators 23 may be provided at a plurality of locations in a continuous frame shape or discontinuous surrounding the welding projection 22 along the outer edge of the back surface of the balance piece main body 21.

  As shown in FIG. 3, the balance piece 20 is placed on the surface of the propeller shaft main body 11 (the pipes 11 </ b> A and 11 </ b> B) so as to contact the welding projection 22 and the insulator 23. One electrode tip is provided on the upper surface of the balance piece main body 21, and the other electrode tip is provided on the propeller shaft main body 11 side. The balance piece 20 is pressed against the propeller shaft main body 11 by both electrode tips, a large current is supplied to the propeller shaft main body 11 for a short time, and the welding projection 22 and the welding local part of the propeller shaft main body 11 in contact therewith are melted and combined.

The balance piece 20 is manufactured by the following process (FIG. 4).
(1) The insulator 23 is coated on the entire back surface of the circular tube 1 that is the material of the balance piece main body 21. At this time, the inner diameter of the circular pipe 1 has a curvature along the surface of the propeller shaft main body 11 (pipe 11A, 11B).

  (2) The circular tube 1 of the above (1) is cut with a circumferential length (predetermined weight) that becomes the balance piece main body 21. In FIG. 4, A to F indicate cleavage sites.

  (3) The welding projection 22 is press-molded on the balance piece main body 21 described in (2) above, and the insulator 23 is pierced by the welding projection 22.

  When the inner diameter of the circular tube 1 does not have a curvature along the surface of the propeller shaft main body 11, the balance piece main body 21 is press-molded (bent) so as to follow the curvature of the surface of the propeller shaft main body 11 in the above (3). At the same time, the welding projection 22 is also press-molded.

According to the present embodiment, the following operational effects can be obtained.
(a) The balance piece 20 is provided by coating the insulator 23 and has high productivity.

  (b) When the balance piece 20 is placed along the surface of the propeller shaft main body 11 and is electrically welded, only the welding projection 22 serves as a conductive portion and contacts the surface of the propeller shaft main body 11. Therefore, since the welding current supplied to the balance piece 20 passes only through the welding projection 22 and does not leak from the other parts to the propeller shaft main body 11, the welding projection 22 of the balance piece 20 and the propeller shaft main body 11 are prevented. The portion in contact with this is sufficiently melted to ensure the welding strength.

  When the welding projection 22 provided on the balance piece 20 is provided at only one place, the torsion durability of the propeller shaft main body 11 is prevented without the balance piece 20 restraining the torsion caused by the torque applied to the propeller shaft main body 11. Can be improved.

  (c) The step of coating the insulator 23 on the entire back surface of the circular tube 1, the step of cutting the circular tube 1 with a circumferential length to be the balance piece main body 21, and the welding protrusion on the balance piece main body 21 The balance piece 20 of the above-mentioned (a) and (b) can be easily manufactured by press-molding 22 and having the step of breaking through the insulator 23 by the welding projection 22.

  (d) Since the circular pipe 1 of (d) described above has a curvature along the surface of the propeller shaft body 11, the balance piece 20 along the surface of the propeller shaft body 11 can be easily manufactured.

  5 and 6 show a balance piece 30 in place of the balance piece 20 shown in FIGS.

  As shown in FIG. 5, the balance piece 30 has, for example, a rectangular shape in plan view, and is along the surface of the propeller shaft main body 11 (pipe 11 </ b> A, 11 </ b> B) by a metal plate piece having a size corresponding to the required weight. A balance piece body 31 having a curvature is formed. The balance piece 30 has a welding projection (projection) 32 substantially projecting from the back surface of the balance piece main body 31, and is insulated with rubber, resin, or the like around the welding projection 32. The body 33 is provided by painting. The insulator 33 is provided in a continuous frame shape (may be a plurality of discontinuous locations) surrounding the welding projection 32 along the outer edge of the back surface of the balance piece main body 31. The insulator 33 may be provided on the entire surface excluding the welding projection 32 on the back surface of the balance piece main body 31.

  As shown in FIG. 6, the balance piece 30 is placed on the surface of the propeller shaft main body 11 (the pipes 11 </ b> A and 11 </ b> B) so as to contact the welding projection 32 and the insulator 33. One electrode tip is provided on the upper surface of the balance piece main body 31, and the other electrode tip is provided on the propeller shaft main body 11 side. The balance piece 30 is pressed against the propeller shaft main body 11 by both electrode tips, a large current is supplied to the propeller shaft main body 11 for a short time, and the welding projection 32 and the weld local part of the propeller shaft main body 11 in contact therewith are melted and combined.

The balance piece 30 is manufactured by the following process.
(1) The insulator 33 is coated on the back surface of the flat plate that becomes the balance piece body 31.

  (2) The balance piece main body 31 of the above (1) is press-formed (bent) along the curvature R of the surface of the propeller shaft main body 11 (pipe 11A, 11B), and at the same time, the welding projection 32 is also press-formed. At this time, when the insulator 33 is coated on the entire back surface of the balance piece main body 31 in the above (1), the insulator 33 is pierced by the press-formed welding projection 32.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to these embodiments, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is a schematic view showing a propeller shaft. FIG. 2 shows a balance piece, (A) is a cross-sectional view, and (B) is a back view. FIG. 3 is a cross-sectional view showing a state in which a balance piece is welded to the surface of the propeller shaft. FIG. 4 is a front view showing a circular pipe. FIG. 5 shows a balance piece, (A) is a cross-sectional view, and (B) is a back view. FIG. 6 is a cross-sectional view showing a state in which a balance piece is welded to the surface of the propeller shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circular pipe 10 Propeller shaft 11 Propeller shaft main body 20, 30 Balance piece 21, 31 Balance piece main body 22, 32 Welding protrusions 23, 33 Insulator

Claims (4)

In the propeller shaft balance piece welded to the surface of the propeller shaft,
A balance piece for a propeller shaft, wherein an insulator is coated on a peripheral portion of a welding projection on the back surface of the balance piece body. It is a manufacturing method of the balance piece for propeller shafts according to claim 1,
Painting an insulator on the back of the flat plate that will be the balance piece body;
A method for producing a balance piece for a propeller shaft, comprising: pressing the balance piece main body so as to follow the curvature of the surface of the propeller shaft, and simultaneously press-forming a welding projection. It is a manufacturing method of the balance piece for propeller shafts according to claim 1,
Painting the insulator on the entire back of the tube,
Cutting the circular tube with a circumferential length to be a balance piece body;
A method of manufacturing a balance piece for a propeller shaft, comprising: pressing a welding projection on the balance piece body, and piercing the insulator with the welding projection.   The manufacturing method of the balance piece for propeller shafts of Claim 3 with which the said circular pipe has a curvature along the surface of a propeller shaft.

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