JP2002051487A - Fixing structure of plate-shaped member, and shaft and fixing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a simple and convenient fastening means, without impairing reliability in fixing a plate-shaped member and a shaft member. SOLUTION: This fixing structure of the plate-shaped member and the shaft shaped member comprises the peripheral edge of a fitting small hole in the plate-shaped member has a cylindrical-shaped part, and a conical-shaped recessed part or a wave-shaped part communicating with the cylindrical-shaped peripheral edge part. The end part of the shaft-shaped member is formed with a fitting part, by extending the external diameter of the shaft or forming an offset part, having a smaller diameter. After both of these are fitted, the cylindrical-shaped peripheral edge part and the conical-shaped recessed part communication with the cylindrical-shaped peripheral edge part or the wave-shaped part, having a recessed and projecting part in the front and the back of the plate-shaped member, are pressed by a jig for deformation so as to obtain fixing force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure between a plate member and a shaft member, such as a connection between a rotor shaft of a motor and a rotor body and a connection between a gear and a shaft of a speed reducer.

[0002]

2. Description of the Related Art With the pursuit of resource saving in response to the needs of environmental purification, the demand for downsizing and simplification of the process is continuing, and there is a demand for an improved technology that does not impair the reliability in each field. Have been. Various technologies related to electric motors are no exception, and there is still a demand for miniaturization and cost reduction on the premise of maintaining high performance. inside that,
One of the issues that leaves room for technical improvement in relation to reliability is improvement of the connecting means of the rotating part.

FIGS. 7, 8, and 9 show an example of a fastening structure between a plate member 4 and a shaft member 6 according to the prior art. The first example shown in FIG. The bush 5 is used in combination as a securing means, and has a general configuration as a strength increasing means. In the second example shown in FIG. 8, the thin plate-shaped member 4 is directly fastened and fixed to the shaft member 6, and the shaft member is formed into a stepped structure, and after the plate-shaped member 4 is fitted, the stepped body contact is used. Then, the fixing strength is obtained by caulking work. FIG. 9 shows a cylindrical peripheral portion 4-2 in the small fitting hole 4-1 of the plate member 4 in order to avoid the use of the bush 5 as a reinforcing means.
This is what has been so-called burring processing, and is widely used as a means for increasing the strength in recent years.

[0004]

In the above-mentioned conventional construction, the means for fastening the plate-shaped member and the shaft member has a small fitting hole and a small shaft diameter due to the need for downsizing. It was a disaster and there was a need for improvements in reliability in terms of strength.

[0005]

According to the present invention, there is provided a fixing structure of a plate-shaped member and a shaft member, wherein the small hole for fitting the plate-shaped member has a thickness at the deep end of the conical recess or between the top and bottom of the conical recess. Has a cylindrical peripheral portion communicating with a corrugated portion having irregularities of three times or less, and the shaft member is arranged in the axial direction on the outer peripheral surface near the straight end portion or on the outer peripheral surface of the small diameter portion having a step. A plurality of grooves or spiral grooves or a plurality of small holes formed in the circumferential direction and a plurality of small holes, or an uneven forming portion formed as a non-uniform rough surface, wherein the uneven forming portion is formed with the small holes. Forming a fitting portion, pressure contact by pressurized deformation to a cylindrical peripheral portion outer peripheral surface formed on the plate-shaped member corresponding to the unevenness of the shaft member is configured to be a fixing means,

Further, as a method of realizing the above-mentioned fastening structure, an uneven portion of a shaft member is inserted into a cylindrical peripheral portion provided in a small hole of the plate member, and the uneven portion of the shaft member is inserted into the uneven portion. After fitting the cylindrical peripheral edge of the plate-shaped member small hole, the cylindrical peripheral edge outer peripheral surface is adjusted so that the thickness of the cylindrical peripheral edge is 20% to 80% of the original plate-shaped member. The fixing force is increased by deforming by pressing in the center direction or by deforming the corrugated portion by pressing.

[0007]

FIG. 1 is a sectional view showing an example of an electric motor in which a fixing structure of a plate-like member 4 and a shaft member 6 according to the present invention is employed as a fastening means of a rotor, and FIGS. FIG. 10 is a cross-sectional view of a principal part explaining a fixing portion of an example of the fastening structure according to the present invention, which is in line with the example of FIG. FIG. 6 is an explanatory diagram showing an operation state for realizing the fixing structure.

As shown in FIG. 1, the electric motor of this example is an external rotation type rotating machine, and the outer diameter of the rotor is large and the moment of inertia is large, so that the fastening force between the shaft and the rotor body is high. It is well known that trust is required.

In addition, it is needless to say that it is necessary to consider the fixing force in the axial direction in connection with driving the external load.
A spiral concave portion 6-3 is formed on the outer peripheral surface of the small-diameter step portion 6-1 at the end of the plate member 4. On the other hand, the plate-shaped member 4 which is fastened to this and forms the rotor 2 has a peripheral edge of the small fitting hole 4-1. In addition, a cylindrical peripheral portion 4-2 for increasing the fitting area is formed. The fastening force is determined by the stepped small-diameter fitting portion 6-1 at the tip of the shaft and the plate-shaped member 4.
After fitting of the small hole formed on the cylindrical peripheral portion 4-2,
It is obtained by deforming the outer peripheral surface of the cylindrical peripheral portion 4-2 toward the center.

At this time, as means for reinforcing the fastening force of the outer peripheral surface of the cylindrical peripheral portion 4-2 of the small hole due to the pressing deformation toward the center, for example, in the example of FIG. 1 or FIG. A conical recess 4-3 is also formed in the plate member 4 so as to communicate with the cylindrical peripheral portion 4-2, and the conical recess 4-3 is configured to be deformed under pressure in the axial direction and the radial direction. Have been.

FIG. 3 shows that the shaft member 6 has no small-diameter stepped portion,
The fitting portion is formed as an extension portion having an outer diameter of the shaft. After forming an uneven surface by forming a spiral concave portion on the outer peripheral surface, the cylindrical peripheral portion 4-2 of the small hole of the plate member 4 is formed. Is fitted. The cylindrical peripheral portion 4-2 of the small hole communicates with the wavy forming portion 4-4, and the outer peripheral surface of the cylindrical peripheral portion 4-2 is pressed and deformed in the center direction, and the wavy forming portion 4-4 is deformed. Part 4-4
Is deformed under pressure in the axial or radial direction to increase the fastening force.

FIGS. 4 and 5 show an example of a structure different from the examples shown in FIGS. 2 and 3. FIG. 4 shows a shaft member 6 having no small-diameter step. Columns 6-4,
FIG. 5 shows an example in which the configuration of the uneven surface of the shaft member 6 having the small-diameter stepped portion 6-1 is changed to an uneven rough surface 6-5. FIG. 6 is a schematic view for explaining an operation for obtaining these fastening forces. The small-diameter step portion 6-1 of the shaft 6 and the small hole 4-1 of the plate-like member 4 are shown in FIG.
Are fitted, and the cylindrical peripheral portion 4-2 of the small hole 4-1 is fitted.
And a conical recess communicating with the cylindrical peripheral portion 4-2 are both deformed under pressure. At the time of this fitting and pressurizing deformation, the outer peripheral surface of the fitting portion forming the uneven surface of the shaft member 6 and the small hole 4-
1 does not necessarily need to be aligned, and may be in a loosely fitted state that does not affect the concentric accuracy, and the precision retention related to the concentricity after fastening is not shown or shown in detail. But,
This can depend on the jigs 10-1 and 10-2.

The uneven shape and the like related to the fastening fitting in the above-described example are described with a specific shape. However, the shape and the like are determined by selecting the fitting size, the material, particularly the thickness of the plate-like member 4 and the like. It can be arbitrarily selected in terms of the correlation with the desired fastening strength, including the configuration.

[0014]

According to the fixing structure of the plate member and the shaft member and the fixing method of the present invention, a highly reliable fastening means can be realized while avoiding the use of another member represented by a bush.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of an epimotor according to the present invention.

FIG. 2 is a partial cross-sectional view showing a second example of the fastening structure similar to the example of FIG.

FIG. 3 is a partial cross-sectional view of a third example of the fixing structure of the plate member and the shaft member according to the present invention.

FIG. 4 is a partial cross-sectional view of a fourth example of the fixing structure of the plate member and the shaft member according to the present invention.

FIG. 5 is a partial cross-sectional view of a fifth example of the fixing structure of the plate member and the shaft member according to the present invention.

FIG. 6 is a cross-sectional view of a main part illustrating a state of press deformation according to the present invention.

FIG. 7 is a schematic cross-sectional view of a first example of a conventional structure for fixing a plate-shaped member and a shaft member.

FIG. 8 is a schematic cross-sectional view of a second example of a conventional structure for fixing a plate-like member and a shaft member.

FIG. 9 is a schematic cross-sectional view of a third example of a fixing structure for fixing a plate member and a shaft member according to the related art.

[Description of Signs] 1 Abduction type electric motor 2 Rotor 2-1 Permanent magnet 3 Stator 4 Plate member (rotor yoke of abduction type rotor) 4-1 Small hole 4-2 Small hole 4-3 Conical concave portion communicating with the cylindrical peripheral portion of the small hole 4-4 Wave-shaped forming portion communicating with the cylindrical peripheral portion of the small hole 5 Bush 6 Shaft member 6-1 Small-diameter step portion 6 2 Unevenness composed of grooves aligned in the axial direction 6-3 Unevenness forming a spiral 6-4 Unevenness which is a row of small holes 6-5 Unevenness which is an uneven rough surface 7 Bearing 8 Fixing and holding member 9 External mounting Member 10-1, 10-2 Jig for pressing and deforming plate-shaped member

Claims (12)

[Claims] In a fixing structure of a plate member having a small hole and a shaft member fitted into the small hole, the plate member is
The small hole for fitting has a cylindrical peripheral portion, the shaft member has an uneven portion on the outer peripheral surface near the end portion, and the uneven portion forms a fitting portion with the small hole, A fixing structure for fixing a plate-shaped member and a shaft member, wherein pressure contact by pressurization deformation to the outer peripheral surface of the cylindrical peripheral edge portion corresponding to unevenness of the shaft member is configured as fixing means. 2. The fixing structure according to claim 1, wherein the uneven portion near the end of the shaft member is an outer peripheral surface of a small-diameter stepped portion. 3. A cylindrical peripheral portion of the small hole communicates with a deep end of a conical recess formed in the plate member.
The structure for fixing a plate-shaped member and a shaft member according to any one of claims 1 to 2, characterized in that: 4. The cylindrical peripheral portion of the small hole communicates with a corrugated formed portion formed on the front and back surfaces of the plate-shaped member. The fixing structure of the plate-shaped member and the shaft member according to the above. 5. The plate-shaped member according to claim 4, wherein the corrugated portion formed on the plate-shaped member is three times or less the thickness of the plate-shaped member between the front and back tops. Fixed structure with shaft member. 6. The unevenness of the unevenness forming portion near the end of the shaft member is formed as a plurality of grooves formed so as to be aligned in the axial direction on the outer peripheral surface of the fitting portion. A fixing structure of the plate-shaped member and the shaft member according to any one of claims 1 to 5. 7. The method according to claim 1, wherein the unevenness of the unevenness forming portion near the end of the shaft member is formed as a spiral groove on the outer peripheral surface of the fitting portion. A fixing structure between the plate member and the shaft member described in the above. 8. The unevenness of the unevenness forming portion near the end of the shaft member is formed as a plurality of small holes formed in the outer peripheral surface of the fitting portion in a circumferential direction. A fixing structure of the plate member and the shaft member according to claim 1. 9. The unevenness of the unevenness forming portion near the end of the shaft member is formed as a non-uniform rough surface on the outer peripheral surface of the fitting portion. The fixing structure of the plate member and the shaft member. 10. Fixing a plate-shaped member provided with a small hole having a cylindrical peripheral portion on the periphery thereof, and a shaft member fitted into the small hole and provided with an uneven portion near its end. By the way,
After inserting the concave and convex forming portion of the shaft member into the cylindrical peripheral portion provided in the small hole of the plate member, and fitting the cylindrical peripheral portion of the small plate member into the concave and convex forming portion of the shaft member. A fixing method for fixing a plate-shaped member and a shaft member, wherein a fixing force is obtained by pressurizing and deforming the outer peripheral surface of the cylindrical peripheral portion in the center direction. 11. Pressurizing and deforming the outer peripheral surface of the cylindrical peripheral portion of the plate-shaped member small hole communicating with the corrugated portion having irregularities on the front and back toward the center, and also deforming the corrugated portion. The method for fixing a plate-shaped member and a shaft member according to claim 10, wherein the fixing force is enhanced by (1). 12. After fitting the cylindrical peripheral portion of the plate-shaped member small hole into the concave / convex portion of the shaft member, the outer peripheral surface of the cylindrical peripheral portion is reduced in thickness to the original value. The method for fixing a plate-shaped member to a shaft member according to claim 10, wherein the plate-shaped member is pressurized and deformed in the center direction so as to have a thickness of 20% to 80% of the plate-shaped member.