JP2000354355A - Fastening structure and fastening method between solid member having hole and cylindrical member - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is intended to obtain a predetermined press-in allowance by a press-fitting fixing means by an inconvenience in environment, time control, temperature control and the like in handling chemical substances. The purpose is to realize dimensional control relaxation. In the fastening structure for a solid member, for example, a stator core, according to the present invention, the cylindrical member for fitting and holding the fixing member has a pair of circumferential concave portions on the outer peripheral surface and an intermediate portion between the pair of circumferential concave portions. An axially-facing circumferential convex portion of the inner peripheral surface corresponding to the portion, and an expanding deformation in the vicinity of a pair of circumferential concave portions of the outer peripheral surface accompanying the expanding deformation of the circumferential convex portion of the inner peripheral surface; And a step of inserting a solid member into the cylindrical member, and in a state where the solid member is inserted, a steel ball having a predetermined outer diameter is passed through the inner peripheral surface of the cylindrical member. And expanding and deforming the axially-facing circumferential protrusion formed on the inner peripheral surface of the cylindrical member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening of a solid member having a hole and a cylindrical member inserted through the hole of the solid member, for example, a stator core of an external rotating electric machine and a cylindrical member forming a bearing box. It relates to a structure and a fastening method.

[0002]

2. Description of the Related Art Although not shown or shown in detail, for example,
In the stator of the abduction type rotating electric machine, the fastening means between the stator core and the cylindrical member that holds the stator and forms the bearing box is generally bonded and fixed to eliminate the influence on the inner diameter of the bearing box. In other applications, the press-fit fixing is also employed in a configuration in which the rigidity of the cylindrical member is sufficient.

[0003]

The conventional structure as described above is complicated in handling the chemical substance in the environment, time management and temperature management in the work, and also requires a certain amount of fixing means by press-fitting. There has been a demand for improvements such as difficulties in dimension management for obtaining press-fitting costs.

[0004]

A fastening structure according to the present invention is a cylindrical member (the stator) which is inserted into a solid member having a hole (for example, a stator core of an external rotating machine) and is fastened and held. A cylindrical member forming a bearing housing corresponding to the iron core) is arranged in at least one place on the outer peripheral surface thereof in the vicinity of the circumferential direction to form a pair, and an intermediate portion between the pair of circumferential concave portions In the inner peripheral surface corresponding to the, at least one rising end has an inclined surface, provided with a circumferential convex portion directed to the axial center formed so as to be connected to the inner peripheral surface, of the inner peripheral surface It is configured to be fastened by expanding deformation in the vicinity of the circumferential recess forming a pair of the outer peripheral surfaces with the expansion of the circumferential protrusion.

Further, for fastening and fixing a solid member (stator core) and a cylindrical member (a cylindrical member forming a bearing housing),
A step of inserting the solid member into the cylindrical member, and in the inserted state, a steel ball having an outer diameter larger than the inner diameter of the circumferential convex portion is formed on the axially-facing circumferential convex portion of the inner peripheral surface of the cylindrical member. Penetrating and expanding and deforming the circumferential projection to expand and deform the vicinity of the circumferential concave portion of the outer peripheral surface of the cylindrical member, thereby expanding the vicinity of the circumferential concave portion of the outer peripheral surface of the cylindrical member. It is configured to obtain a fastening force by open deformation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show the fastening state of the solid member 1 having the hole 1-1 shown in FIG. 3 and the cylindrical member 2 having the outer peripheral surface 2-1 sized to match the hole 1-1 shown in FIG. FIG.

The solid member 1 shown in FIG.
The cylindrical member 2 shown in FIG. 4 is inserted through the hole 1-1. As shown in FIG. 4, the outer peripheral surface 2 of the cylindrical member 2
-1, two adjacent circumferential recesses 2-11 are formed, and an inner circumferential surface 2-2 corresponding to an intermediate portion of the pair of recesses 2-11 has a circumferential direction facing the axial center. Protrusions 2-21 are provided.

FIG. 1 shows the above-mentioned state of insertion of both.
In this inserted state, the hole 1-1 of the solid member and the outer peripheral surface 2-1 of the cylindrical member are simply aligned, and there is no fastening force between them. Therefore, as shown in FIG. 5, for example, as shown in FIG.
Steel ball 3 having an outer diameter φD larger than the inner diameter φd of No. 11
To the circumferential convex inner diameter 2-211 and the circumferential convex 2
-21 is penetrated from the end side having the inclined surface 2-212. FIG. 2 shows a state after the steel ball 3 has been penetrated. The solid member gets into the inner peripheral surface of the hole 1-1 to obtain a fastening force.

By setting the outer diameter φD of the steel ball 3 and the inner diameter φd of the circumferential projection 2-21 of the cylindrical member 2 to be D> d,
This enables expansion deformation.

Further, as described above, in order to facilitate the forced penetration of the steel ball 3, the inner peripheral surface 2 of the cylindrical member 2 is formed.
It is preferable that an inclined surface 2-212 is formed at the steel ball insertion-side end of the circumferential projection 2-21 formed in No. 2, but the inclined surface 2-212 is not essential.

In the above-described example, the circumferential concave portion 2-11 of the outer peripheral surface 2-1 accompanying the expanding deformation formed in the cylindrical member 2 and the corresponding circumferential convex portion 2-11 of the inner peripheral surface 2-2 are formed. 21 are provided at one place, but may be provided at a plurality of places corresponding to a desired fastening force. The shape of the circumferential recess 2-11 including the circumferential protrusion 2-21 is also as illustrated. Any other than the shape can be selected.

The penetration of the steel ball 3 for deforming the circumferential projection 2-21 formed on the inner peripheral surface 2-2 of the cylindrical member 2 to obtain the above-described fastening force is performed, for example, by an abduction type rotation shown in FIG. Mounting a cylindrical member 2 'forming a stator 1' and a bearing box inserted through the stator 1 'on a pedestal B5 to exemplify a stator 1' of the machine;
It is a simple means to push down the steel ball 3 inserted into the cylindrical member 2 'with the push rod A4.

Although the illustration and detailed description of the inner peripheral surface 2-2 of the solid member are omitted, a non-circular portion is provided so that the expanded deformed portion 2-12 of the cylindrical member 2 can enter there. By doing so, the fastening force can be increased. The means for expanding and deforming the cylindrical member 2 is not limited to the above-described steel ball, but may be, for example, a rod-shaped member.

[0014]

The fastening structure according to the present invention can avoid deformation at other portions of the cylindrical member, and can realize highly effective and highly effective fastening means.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state of insertion of a solid member and a cylindrical member according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state after a steel ball is penetrated in the example of FIG. 1;

FIG. 3 is a sectional view of a main part showing the solid member of the example of FIG. 1;

FIG. 4 is a sectional view showing the cylindrical member of the example of FIG. 1;

FIG. 5 is a sectional view showing a steel ball of the example of FIG. 1;

FIG. 6 is a schematic sectional view illustrating a process for penetrating the steel ball of the example of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solid member 1 'Stator of abduction type rotary machine 1-1 Hole 2 Cylindrical member 2' Cylindrical bearing box 2-1 Outer peripheral surface 2-11 Circumferentially concave part 2-12 Expanding deformation part 2-2 Inner circumference Surface 2-21 Circumferential portion in the circumferential direction 2-211 Inner diameter of convex portion 2-212 Inclined surface 3 Steel ball 4 Jig A (push rod) 5 Jig B (cradle) 5-1 Steel ball passage

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J022 DA01 DA11 EB14 EC17 FA02 FB13 FB16 GA04 GA19 GB05 5H607 BB14 BB17 CC01 DD01 DD16 GG00 5H615 AA01 BB14 PP01 PP25 SS03 SS09 SS10 TT13

Claims (5)

[Claims] In a fastening structure between a solid member having a hole and a cylindrical member inserted through the hole of the solid member, the cylindrical member is axially close to at least one location on an outer peripheral surface thereof. A pair of circumferential concave portions, and an inner circumferential surface corresponding to an intermediate portion of the pair of circumferential concave portions, provided with a circumferential convex portion facing the axial center, and a circumferential convex portion of the cylindrical member inner circumferential surface. A solid member having a hole, wherein the expanding deformation in the vicinity of the pair of circumferential concave portions of the outer peripheral surface accompanying the expansion of the outer peripheral surface is a fastening means with the solid member; Fastening structure with cylindrical member. 2. A stator of an external rotary electric machine comprising: a stator core on which a winding is wound; and a cylindrical member inserted through and held by the stator core to form a bearing box, wherein the cylindrical member comprises: At least at one location on the outer circumferential surface, a pair of circumferential recesses that are closely arranged in the axial direction, and an inner circumferential surface corresponding to an intermediate portion of the pair of circumferential recesses have a circumferential circumferential direction. With the convex portion, with the expansion of the circumferential convex portion of the inner peripheral surface of the cylindrical member, the expansion deformation near the circumferential concave portion forming a pair of the outer peripheral surface is a fastening means with the stator core, A fastening structure between a stator core and a cylindrical member of an abduction type rotary electric machine, characterized in that: 3. An axially-oriented circumferential projection formed on the inner peripheral surface of the cylindrical member has at least one rising end having an inclined surface, and is formed continuously with the inner peripheral surface of the cylindrical member. The structure for fastening a solid member having a hole and a cylindrical member according to any one of claims 1 and 2, to the cylindrical member. 4. The fastening structure between a solid member having a hole and a cylindrical member according to claim 1, wherein the hole in the inner peripheral surface of the solid member has a non-circular portion. 5. A step of inserting the cylindrical member into a hole of the solid member to fasten and fix a solid member having a hole and a cylindrical member inserted through the hole of the solid member. In the inserted state, a steel ball having an outer diameter larger than the inner diameter of the circumferential protrusion is penetrated through the circumferential protrusion on the inner peripheral surface of the cylindrical member toward the axial center to expand and deform the circumferential protrusion. A step of expanding and deforming the vicinity of the circumferential concave portion of the outer peripheral surface of the cylindrical member. A method of fastening a solid member having a hole and a cylindrical member inserted through the hole.