JP3514380B2 - Fixing structure of plate member and shaft and method of fixing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure for a plate-shaped member and a shaft member, such as a connection between a rotor shaft of an electric motor and a rotor body, a connection between a gear of a reduction gear and a shaft.

[0002]

2. Description of the Related Art Due to the pursuit of resource saving to meet the needs of environmental purification, there is a continuous demand for downsizing and simplification of processes, and improved technologies without impairing reliability are required in each field. ing. The technologies related to electric motors are no exception, and demands for downsizing and cost reduction are premised on maintaining high performance. inside that,
In terms of reliability, one of the issues that leaves room for technical improvement is improvement of the coupling means of the rotating part.

FIG. 8, FIG. 9 and FIG. 10 show an example of a fastening structure of a plate member 4 and a shaft member 6 according to the prior art.
In the first example shown in FIG. 8, the bush 5 is interposed because the strength is uncertain when the thin plate member 4 and the shaft member 6 are directly fastened and fixed. The example shown in FIG. This is a general configuration in which a step is provided on a shaft member, a small hole of a plate-like member is fitted into the stepped portion, and then the fitting surplus portion is deformed under pressure, so that strength is maintained in so-called caulking work. Further, FIG. 10 shows a so-called burring process in which a cylindrical peripheral portion 4-2 is formed in the fitting small hole 4-1 of the plate member 4 in order to avoid the combined use of the bush 5 as a reinforcing means. Recently, it has been widely used as a means for increasing strength.

[0004]

In the above-mentioned conventional structure, as a fastening means for the plate member and the shaft member, the fitting small hole and the shaft diameter may be reduced due to the need for miniaturization. Due to the disaster, improvement in reliability in terms of strength was required.

[0005]

In the fastening structure of the plate member and the shaft member according to the present invention, the flange of the small diameter step portion provided at the end portion of the shaft member is fitted with the step with the outer diameter surface of the groove portion. The fitting small holes formed in the plate-shaped member have a cylindrical peripheral edge portion and are equal to or less than the thickness of the plate-shaped member to be fixed. A non-planar shape is formed as an edge-shaped concavo-convex shape, and the cylindrical peripheral edge portion of the small hole communicates with a corrugated forming portion having concavo-convex portions formed on the inner end or the front and back of the conical recess formed in the plate member. Is formed.

In the fastening and fixing means having the above structure, the small-diameter step portion of the shaft member is inserted into the cylindrical peripheral portion of the small hole formed in the plate-like member, and the small hole cylindrical shape of the small hole is formed in the groove-shaped small diameter step portion. With the step of fitting the peripheral edge portion, the step of pressurizing and deforming the outer peripheral surface of the cylindrical peripheral edge portion of the small hole toward the center, and the step of pressurizing and deforming the shaft end side surface of the collar in the axial direction. A step of deforming the wavy shaped portion or the conical concave portion communicating with the cylindrical peripheral portion of the small hole formed in the plate-shaped member under pressure.

[0007]

1 is a sectional view showing an example of an electric motor in which a solid structure of a plate member 4 and a shaft member 6 according to the present invention is adopted as a fastening means of a rotor. FIG. 2 is a cross-sectional view showing the fastening portion according to the present invention as a side view, and FIG. 2 is an explanatory diagram of an example similar to the example of FIG. 1 having a wavy forming portion communicating with a cylindrical peripheral portion of a small hole of a plate-shaped member.

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

Needless to say, it is necessary to consider the axial fixing force as well as to drive an external load. In order to deal with these, the tip of the shaft member 6 has a tip collar. A groove-shaped small-diameter step portion 6-1 having a groove 6-2 is formed, and the plate-shaped member 4 fastened to the groove-shaped step portion 6-1 is formed on the periphery of the fitting small hole 4-1 to enlarge the fitting area. A cylindrical peripheral portion 4-2 is formed. As will be described later, the fastening force is passed through the cylindrical peripheral edge portion 4-2 of the small hole of the plate member 4 so as to pass over the flange 6-2 at the tip of the shaft, and the cylindrical peripheral edge portion 4 of the small hole is inserted. -2 is fitted to the groove-shaped small-diameter step portion 6-1 formed inside the collar 6-2, and then the outer peripheral surface of the cylindrical peripheral portion 4-2 of the small hole is deformed toward the center. Securely fasten with .

The tip of the cylindrical peripheral edge portion 4-2, which abuts the inside of the shaft end collar 6-2, has a non-planar shape as a plurality of edge-shaped irregularities, and the collar 6-2 is axially arranged. By pressurizing and deforming to realize a bite state between the flange 6-2 and the tip of the cylindrical peripheral portion 4-2, the fastening force of the fastening means is strengthened.

3 to 6 are explanatory views showing a process of fitting and fixing, and FIG. 7 is a schematic diagram for explaining a jig used for pressure deformation of the fastening portion. FIG. 3 shows a state before the plate-shaped member 4 and the shaft member 6 are fitted, and in FIG. 4, the small hole 4-1 of the plate-shaped member 4 is fitted over the flange 6-2 of the shaft member 6. Fig. 5 shows a state in which the outer peripheral surface of the peripheral cylindrical portion 4-2 of the small hole is deformed by pressure in the central direction, and Fig. 6 shows that the shaft end flange 6-2 is further applied in the axial direction. It shows a state of pressure deformation. The shaft end collar 6-
In the axial pressure deformation of 2, the pressing portion of the axial end pressing jig is moved to the peripheral cylindrical portion 4 of the small hole as shown in the schematic view of FIG.
-By adopting a shape corresponding to the concavo-convex shape of the tip, an effective deformed and fixed state can be realized .

Further, for example, as shown in FIG. 2, it is also effective to strengthen the fixing force by pressurizing and deforming the corrugated forming portion communicating with the cylindrical peripheral portion of the small hole. Further, although not shown, it goes without saying that it is also effective to increase the fastening force by subjecting the outer peripheral surface of the groove-shaped small-diameter step portion 6-1 serving as the fastening portion to known so-called knurling.

[0013]

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

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a fastening portion in a side view of an example of an outer rotation type electric motor according to the present invention.

FIG. 2 is a sectional view of another example of a fastening and fixing portion configuration similar to the example of FIG.

FIG. 3 is an explanatory view showing a state before the plate member 4 and the shaft member 6 according to the present invention are fitted together.

4 is an explanatory view showing a state in which a small hole 4-1 of the plate member 4 is fitted over the flange 6-2 of the shaft member 6 following the state of FIG.

FIG. 5 is an explanatory view following FIG. 4, showing a state in which the outer peripheral surface of the peripheral cylindrical portion 4-2 of the small hole is press-deformed in the center direction and press-deformed.

FIG. 6 is an explanatory view illustrating a state in which the shaft end collar 6-2 is further pressed and deformed in the axial direction to continue the pressing deformation, following FIG. 5;

FIG. 7 is an explanatory view showing an example of a jig and an operation state for axially deforming the collar shown in FIG. 6 under pressure.

FIG. 8 is a sectional view of a first example of the related art.

FIG. 9 is a sectional view of a second example of the prior art.

FIG. 10 is a sectional view of a third example of the prior art.

[Explanation of symbols]

1 Abduction type electric motor 2 stator 3 Stator holding part 4 Plate member (rotor yoke of abduction rotor) 4-1 Small hole 4-2 Small hole peripheral cylinder 4-3 Conical recess forming portion that communicates with the small hole peripheral cylindrical portion 4-4 Corrugated forming portion communicating with the cylindrical portion around the small hole 5 bush 6 shaft members 6-1 Groove-shaped small diameter step 6-2 Tsubabe 7 Permanent magnet mainly composed of rotor 8 Bearing members 9 External mounting member 10 A jig for deforming a plate-shaped member under pressure

Continuation of front page (56) Reference JP-A-9-267139 (JP, A) JP-A-63-20139 (JP, A) JP-A-59-80523 (JP, A) JP-A-7-119754 (JP , A) JP 57-160525 (JP, A) JP 2-169143 (JP, A) Actually opened 64-35247 (JP, U) Actually opened 58-71422 (JP, U) Special table flat 8-507479 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16D 1/06 F16B 9/00-11/00 H02K 1/00-1/34 B21D 39/00-41 / 04

Claims (7)

(57) [Claims] 1. A fixing structure of a plate member having a small hole and a shaft member fitted in the small hole, wherein the plate member is
The fitting small hole has a cylindrical peripheral edge portion, the tip of the cylindrical peripheral edge portion has a non-planar uneven shape with a height difference, and the shaft member has a groove-shaped small diameter whose end portion is a flange. The stepped portion has a groove, and by fitting the groove of the shaft member with the small hole peripheral cylindrical portion of the plate-shaped member, pressure contact between the outer peripheral surface of the small-diameter stepped portion of the shaft member and the inner peripheral surface of the plate-shaped member small hole is performed. And the cylindrical peripheral edge of the plate member and the pressure contact between the inner surface of the flange of the small-diameter step portion formed on the shaft member are both formed as fixing means, and the plate member and the shaft member. Fixed structure with. 2. The plate-shaped member and the shaft member according to claim 1, wherein the tip end shape of the cylindrical peripheral portion of the small hole is formed as a plurality of uneven shapes having sharp edges. Fixed structure. 3. The cylindrical peripheral portion of the small hole communicates with the inner end of a conical recess formed in the plate member,
The fixing structure for a plate-shaped member and a shaft member according to claim 1 or 2. 4. The cylindrical portion at the periphery of the small hole communicates with a corrugated forming portion formed on the plate-shaped member and having irregularities on the front and back sides. A structure for fixing a plate-shaped member and a shaft member according to any one of the claims. 5. The collar of the small-diameter step portion provided at the end of the shaft member is characterized in that the step with the outer diameter surface of the groove portion is equal to or less than the thickness of the plate-shaped member fitted and fixed. A structure for fixing the plate member and the shaft member according to any one of claims 1 to 4. 6. A method of fixing a plate-shaped member having a small hole having a cylindrical peripheral edge portion and a shaft member fitted in the small hole and having a groove-shaped small-diameter step portion at its end. After inserting the small-diameter step portion of the shaft member into the cylindrical peripheral portion of the small hole formed in the plate-like member and fitting the cylindrical peripheral portion of the small hole into the groove-shaped small diameter step portion, The outer peripheral surface of the cylindrical peripheral portion of the hole is pressed and deformed in the central direction, and the shaft end side surface of the collar is
Serial that to obtain the adhesive force by the axial direction pressing deformation, claim 1, wherein in any one of claims 5
A method of fixing the mounted plate member and shaft member . 7. The outer peripheral surface of the cylindrical peripheral portion of the small hole formed in the plate member is deformed by pressure in the central direction, and the cylindrical peripheral portion of the small hole formed in the plate member is formed. 7. The method for fixing a plate-shaped member and a shaft member according to claim 6, wherein the corrugated portion or the conical recess that is in communication with each other is also deformed under pressure so as to strengthen the fixing force.