JP2012082910A - Welding structure of rotary member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding structure of a rotary member capable of simplifying protection of a welding part.SOLUTION: In the welding structure 1 of a rotary member including a gear member 5 having a gear part 3, a shaft member 7 to which the gear member 5 is assembled, and a welding part 9 provided between the gear member 5 and the shaft member 7 and fixing the gear member 5 to the shaft member 7 in an integrated rotatable manner. The welding part 9 is composed of: a gear-side welding part 13 provided at the gear member 5 and having a gear-side welding surface 11; and a shaft-side welding part 17 provided at the shaft member 7 and positioned so that a shaft-side welding surface 15 is disposed opposite the gear-side welding surface 11. The gear member 5 is provided with a protection part 21 having a protection surface 19 protruding more than the gear-side welding surface 11.

Description

  The present invention relates to a rotating member welding structure applied to a vehicle.

  Conventionally, as a rotating member welding structure that welds members made of different members so as to be integrally rotatable, a large gear is electron beam welded to the shaft portion of the small gear at an inlay portion, and the large gear and the small gear are joined together. What is fixed so as to be integrally rotatable is known (for example, see Patent Document 1).

  In the welding structure of the rotating member, a groove is formed in the spigot portion between the large gear and the shaft portion, and a void is formed between the grooves when the large gear and the shaft portion are combined. This vacancy facilitates the formation of the electron beam welded portion in the spigot portion and facilitates diffusion of gas generated during electron beam welding.

JP-A-61-62663

  By the way, in the welding structure of the rotating member as described above, the welded portion between the members such as the spigot portion is processed with very high accuracy in order to improve the welding accuracy. For this reason, in order to avoid damage to a welding part before welding between members and at the time of welding, handling of members had to be performed carefully.

  Then, this invention aims at provision of the welding structure of the rotating member which can simplify protection of a welding part.

  The present invention provides a gear member having a gear portion, a shaft member to which the gear member is assembled, and the gear member and the shaft member provided between the gear member and the shaft member so as to be integrally rotatable. A rotating member welding structure including a welded portion, wherein the welded portion is provided on the gear member and has a gear-side welded surface, and the shaft member is provided on the gear-side welded surface. The gear member is provided with a protective portion having a protective surface that protrudes from the gear-side welded surface.

  In this rotating member welding structure, the gear member is provided with a protective portion having a protective surface protruding from the gear-side welding surface, so that when the gear member is handled alone, when the gear member is transported or stored, etc. By grounding the gear-side welded surface, the protective surface of the protection portion can be grounded before the gear-side welded surface, and damage to the gear-side welded surface can be prevented.

  Therefore, in such a welding structure of the rotating member, the gear member can be easily handled, workability can be improved, and protection of the welded portion can be simplified.

  According to the present invention, there is an effect that it is possible to provide a welding structure of a rotating member that can simplify the protection of a welded portion.

It is sectional drawing of the power transmission device with which the welding structure of the rotating member which concerns on embodiment of this invention was applied. It is sectional drawing of the welding structure of the rotating member which concerns on embodiment of this invention. (A) is sectional drawing of the gear member of the welding structure of the rotating member which concerns on embodiment of this invention. (B) is sectional drawing of the shaft member of the welding structure of the rotating member which concerns on embodiment of this invention.

  First, an example of a power transmission device to which the rotating member welding structure of the present invention is applied will be described with reference to FIG.

  As shown in FIG. 1, the power transmission device 101 includes a casing 103, a shaft member 7, a drive shaft 105, and a direction change gear set 107. The casing 103 includes a plurality of divided cases, and is fixed to a stationary system member (not shown) such as a casing that houses a vehicle body frame and other power transmission mechanisms. In the casing 103, the shaft member 7 and the drive shaft 105 are rotatably accommodated.

  The shaft member 7 is formed in a hollow shape and is rotatably supported on the casing 103 via a pair of bearings 109 and 111 on both sides in the axial direction. A shaft 113 connected to an input-side transmission mechanism (not shown) is inserted on the inner peripheral side of the shaft member 7 so as to be rotatable relative to the shaft member 7. Further, a spline-shaped connecting portion 115 is formed on the outer periphery of the axial end portion of the shaft member 7 so as to be integrally rotatable with the input side transmission mechanism, and a driving force is input to the shaft member 7. The driving force input to the shaft member 7 is output to the drive shaft 105.

  The drive shaft 105 is disposed in a direction orthogonal to the axis of the shaft member 7 and is rotatably supported by the casing 103 via a pair of bearings 117 and 119. Further, a flange member 123 is spline-connected to the outer periphery of the drive shaft 105 via a spline-shaped connecting portion 121 so as to be integrally rotatable, and an axial position of the flange member 123 is fixed by a nut 125. The flange member 123 is coupled to an output-side transmission mechanism (not shown) so as to be integrally rotatable, and a driving force from the shaft member 7 side is output to the output-side transmission mechanism via the direction change gear set 107.

  The direction change gear set 107 is constituted by a bevel gear set including a pinion 127 and a gear member 5 that is a ring gear. The pinion 127 is formed at one end of the drive shaft 105 in the axial direction as a member continuous with the drive shaft 105. The pinion 127 meshes with the gear member 5, and the driving force transmitted to the pinion 127 is output from the driving shaft 105 to the output-side transmission mechanism via the flange member 123.

  The gear member 5 is fixed on the outer periphery of the shaft member 7 so as to be integrally rotatable with the shaft member 7 by a welding structure described later. The gear member 5 meshes with the pinion 127 at the gear portion 3, and the driving force is changed in direction from the shaft member 7 to the driving shaft 105 side and transmitted.

  In the power transmission device 101, the driving force input to the shaft member 7 is output to the driving shaft 105 via the direction changing gear set 107. However, the driving force input to the driving shaft 105 is output to the direction changing gear set. It is good also as a structure output to the shaft member 7 via 107. FIG.

  The gear member 5 and the shaft member 7 mounted on such a power transmission device 101 are fixed so as to be integrally rotatable by welding. Hereinafter, the welding structure of the rotating member according to the embodiment of the present invention will be described with reference to FIGS.

  The rotating member welding structure 1 according to the present embodiment includes a gear member 5 having a gear portion 3, and the gear member 5 receives an inner peripheral surface 6 thereof and is aligned with each other by a surface 8 (so-called centered). A) a shaft member 7 to be assembled, and a welding portion 9 provided between the gear member 5 and the shaft member 7 and fixing the gear member 5 and the shaft member 7 so as to be integrally rotatable.

  In addition, the welded portion 9 is positioned on the gear member 5 with the gear-side welded surface 13 facing the gear-side welded surface 13 and the gear-side welded surface 11 provided on the shaft member 7. It consists of a shaft-side weld 17.

  The gear member 5 is provided with a protective portion 21 having a protective surface 19 that protrudes from the gear-side welded surface 11 with a gap 18 having a predetermined volume spreading in an annular shape in the radial direction.

  Moreover, the protection part 21 is provided over the circumferential direction of the gear member 5.

  As shown in FIGS. 2 and 3, the welded portion 9 includes a gear-side welded portion 13 and a shaft-side welded portion 17. The gear-side welded portion 13 is provided as a single member that protrudes in the axial direction on the back side of the gear portion 3 of the gear member 5 and continues to the gear member 5 in an annular shape. An end surface in the axial direction of the gear side welded portion 13 is a gear side welded surface 11. The gear side welding surface 11 is welded with the shaft side welding surface 15 of the shaft side welding portion 17.

  The shaft-side welded portion 17 is provided on the outer peripheral side of the shaft member 7 as a single member that is continuous with the shaft member 7 in a flange shape. A facing surface facing the gear side welding surface 11 of the shaft side welding portion 17 in the axial direction is a shaft side welding surface 15. The shaft-side welding surface 15 is welded by laser beam welding, electron beam welding, or the like from the outer diameter side to a plurality of locations in the circumferential direction or the entire circumference with the gear member 5 assembled to the shaft member 7. The gear side welding surface 11 of the gear side welding part 13 is welded and integrated.

  In such a welded portion 9, the gear member 5 and the shaft member 7 are fixed so as to be integrally rotatable by welding the gear side welding surface 11 and the shaft side welding surface 15. A protective portion 21 is provided between the gear side welded portion 13 of the welded portion 9 and the outer peripheral side of the shaft member 7 in the radial direction.

  The protection part 21 is provided as a single member that is continuous with the gear member 5 in an annular shape on the inner diameter side of the gear side welding part 13. The protective surface 19 of the protective portion 21 that faces the shaft-side welded portion 17 is provided so as to protrude in the axial direction from the gear-side welded surface 11 toward the shaft-side welded portion 17, and the gear member 5 is assembled to the shaft member 7. In the state, it is disposed in the recess 23 of the shaft-side welded portion 17. When the gear member 5 is not assembled to the shaft member 7, that is, when the gear member 5 is handled alone, the protective surface 19 is grounded on the back side of the gear portion 3 of the gear member 5. Be grounded before. In addition, the gear-side welding surface 11 is not grounded when the protective surface 19 is grounded. For this reason, the gear side welding surface 11 does not interfere with other members, and damage to the gear side welding surface 11 can be prevented. Further, since the protection portion 21 is provided in an annular shape over the entire circumference of the gear member 5, a beam or the like reaches the outer periphery of the shaft member 7 when the gear side welding surface 11 and the shaft side welding surface 15 are welded. This can be prevented, and the shaft member 7 can be protected during welding.

  In such a rotating member welding structure 1, the gear member 5 is provided with the protective portion 21 having the protective surface 19 that protrudes from the gear-side welded surface 11. By grounding the gear-side welded surface 11 during transportation or storage of the member 5, the protective surface 19 of the protection part 21 can be grounded before the gear-side welded surface 11. Can prevent damage.

  Therefore, in the welding structure 1 of such a rotating member, the gear member 5 can be handled easily, workability can be improved, and protection of the welded portion 9 can be simplified.

  In addition, the gap 18 allows and absorbs sagging of the members during welding of the welds 13 and 17 and facilitates diffusion of the welding gas.

  Furthermore, since the protection part 21 is provided over the circumferential direction of the gear member 5, the protection part 21 can protect the shaft member 7 when the gear side welding surface 11 and the shaft side welding surface 15 are welded. it can.

  Specifically, taking a welding means such as laser beam welding or electron beam welding as an example, the welding side 9 includes the gear-side welding surface 11 and the shaft-side welding surface 15, and the radial axial center side from the radial outside. Suppose that welding was performed toward

  At this time, even if the laser beam or the electron beam penetrates the welded portion 9, the protective portion 21 receives the laser beam or the electron beam, so that the receiving surface 8 and the corner R portion 10 of the gear member 5 in the shaft member 7 are damaged. In addition, it is possible to prevent deformation and strength reduction, and it is not necessary to control the output of the heat source severely in consideration of this damage.

  In the rotating member welding structure according to the embodiment of the present invention, the welded portion is provided on the outer diameter side of the shaft member, and the protective portion is provided between the welded portion and the shaft member in the radial direction. It is good also as a structure which provides a protection part between the axial directions of a welding part and a shaft member or a gear member by providing a part in the axial direction of a shaft member and a gear member.

  Moreover, the protection part does not necessarily need to be formed in an annular shape, and may be convex parts provided at a plurality of locations in the circumferential direction so as to protrude toward the mating surface. Also in this case, the welding surface 11 (welded portion 9) can be protected, and since it is not annular, it can contribute to weight reduction.

DESCRIPTION OF SYMBOLS 1 ... Welded structure of a rotation member 3 ... Gear part 5 ... Gear member 7 ... Shaft member 9 ... Welding part 11 ... Gear side welding surface 13 ... Gear side welding part 15 ... Shaft side welding surface 17 ... Shaft side welding part 19 ... Protection Surface 21 ... Protection part

Claims (2)

A gear member having a gear portion, a shaft member to which the gear member is assembled, and a welded portion provided between the gear member and the shaft member to fix the gear member and the shaft member so as to be integrally rotatable. A rotating member welding structure provided,
The welded portion includes a gear-side welded portion provided on the gear member and having a gear-side welded surface, and a shaft-side welded portion provided on the shaft member and positioned with the shaft-side welded surface facing the gear-side welded surface. Consists of
A rotating member welding structure, wherein the gear member is provided with a protective portion having a protective surface protruding from the gear side welding surface. The welding structure of the rotating member according to claim 1,
The protective member is provided over a circumferential direction of the gear member.

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