JP2596085Y2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] In the present invention, a rotating force is generated by a current flowing between a magnetic field line and an armature winding by a magnetic field, and the rotating force is output via a rotating shaft. The present invention relates to a motor, and more particularly to an attachment structure between a laminated steel plate and a rotating shaft. This motor is used as a rotary drive source of a fuel pump that supplies fuel to an engine such as an automobile.

[Conventional technology]

Conventionally, commonly used motors will be described with reference to FIGS. 8, 9, and 10. FIG.

8 is a side view showing a state in which a laminated steel plate is attached to the rotating shaft, FIG. 9 is a longitudinal sectional view of the rotating shaft including a press-fit projection of the rotating shaft, and FIG. 10 is XX of FIG. It is a longitudinal cross-sectional view in a line. The motor is disclosed in, for example, Japanese Patent Application Laid-Open No. 60-79193, in which a rotating shaft is rotatably supported at the center of a cylindrical housing, and a pair of semi-cylindrical shafts are concentrically mounted on the inner cylindrical portion of the housing. A permanent magnet is disposed, and a laminated steel plate is integrally attached to the rotating shaft in a concentric relationship with the rotating shaft, and a coil wound around the laminated steel plate is integrally attached to the rotating shaft. Is connected to the commutator, and a brush is slidably contacted with the commutator.

Here, the laminated steel plate needs to transmit the rotational force generated in the laminated steel plate to the rotating shaft, and therefore, the laminated steel plate and the rotating shaft need to be integrally attached. Generally, these attachments are performed as follows.

That is, the rotation axis S is given by α from the outer diameter + D of the rotation axis S.
Only partially projecting, and the longitudinal axis XX of the rotation axis S
Press-fitting protrusion 30 is formed. In this case, the press-fit projection 30 can be formed laterally by a method in which a punch having a blade portion is pressed toward the rotation axis S from above and below the rotation axis S. This is commonly referred to as a knuring operation.

The state in which the press-fit projection 30 is formed on the rotating shaft S is well shown in FIG.

On the other hand, the laminated steel sheet P is formed by laminating a plurality of single flat plate-shaped punched steel sheets, and a projection and a recess for positioning and fixing are provided on the front and back of each steel sheet (not shown). A plurality of steel plates can be integrally laminated by fitting the protrusions and the recesses. An insert having an inner diameter φd slightly larger than the outer diameter φD of the rotating shaft S (for example, φD + 20μ) at the center thereof. A hole 31 is provided.

The outer diameter φE of the press-fit projection 30 formed on the rotation shaft S
Is larger than the inner diameter φd of the insertion hole 31 of the laminated steel sheet P.

 That is, φD <φd <φE.

In order to attach the laminated steel sheet P to the rotating shaft S, the insertion hole 31 of the laminated steel sheet P is inserted from the end of the rotating shaft S to a desired position with respect to the rotating shaft S. According to this, in the initial stage of inserting the laminated steel sheet P into the rotation axis S, the insertion hole 31 is formed.
The inner diameter φd of the rotary shaft S is slightly larger than the outer diameter φD of the rotary shaft S, so that it can enter smoothly. However, when the insertion hole 31 reaches the press-fitting protrusion 30 of the rotary shaft S, the insertion hole 31 The part 30 is pressed in while deforming.

Thus, the laminated steel sheet P can be integrally attached to the rotating shaft S by press-fitting the insertion hole 31 of the laminated steel sheet P and the press-fitting protrusion 30 of the rotating shaft S. The state in which the laminated steel sheet P is pressed into the rotating shaft S is shown in FIGS. 8 and 10.

[Problems to be solved by the invention]

 Such a conventional motor has the following problems.

When press-fitting the insertion hole of the laminated steel plate into the press-fitting projection of the rotating shaft, it is necessary to press-fit over the thickness of the stacked laminated steel plates, which increases the press-in time and increases the number of work steps This leads to an increase in manufacturing cost, which is not preferable.

According to the press-fitting of laminated steel sheets, the insertion hole at the press-fit side end of the laminated steel sheet may cut the press-fitting projection and generate fine chips, which generate static electricity and are attracted to the laminated steel sheet or the rotating shaft. And it takes a lot of time to remove the chips.

That is, this chip is formed by an extremely small gap (for example, 0.4 mm) formed between the outer periphery of the laminated steel sheet and the inner cylinder of the permanent magnet.
) Must be deterred.

The mounting strength of the laminated steel plate and the rotating shaft in the rotation direction and the pull-out direction is determined by the inner diameter φd of the insertion hole of the laminated steel plate and the outer diameter φE of the press-fitting projection of the rotating shaft.
The inner diameter of the insertion hole φd is relatively easy to obtain the precision with a precision press, but generally the outer diameter φE of the press-fitting projection is maintained by swelling and protruding by rotating the rotating shaft. , Management required a lot of man-hours.

[Means for Solving the Problems] [Operation] The motor according to the present invention has been made in view of the above-mentioned problems, and enables extremely easy attachment of the laminated steel sheet to the rotating shaft and removal of chips. The main object of the present invention is to provide a simple motor. In order to achieve the above-mentioned object, a rotary shaft rotatably supported by a housing is disposed in the housing in a concentric relationship with the rotary shaft. Having a plurality of semi-cylindrical permanent magnets, and a laminated steel plate integrally attached to the rotating shaft in a concentric relationship with the permanent magnets, and a magnetic field line and an armature winding formed by a magnetic field. In a motor that generates a rotational force by an electric current flowing between, a long groove recessed along the longitudinal axis of the rotating shaft and inward from the outer peripheral surface is formed in the outer peripheral surface of the rotating shaft. Laminated steel sheet formed by laminating multiple steel sheets At the center, a hole slightly larger than the outer diameter of the rotating shaft is drilled, and the insertion hole of the laminated steel plate is inserted into the rotating shaft. The shaft is press-fitted inwardly into the long groove recess of the shaft.

Since the laminated steel plate near the insertion hole is elastically deformed and enters into the long groove recess of the rotating shaft, the laminated steel plate and the rotating shaft can be integrally press-fitted.

〔Example〕

An embodiment of the motor according to the present invention will be described below with reference to FIGS.

FIG. 1 is a side view showing a state where a laminated steel plate is attached to a rotating shaft, FIG. 2 is an enlarged vertical sectional view of the rotating shaft along line II-II in FIG. 1, and FIG. 3 is an enlarged plan view of the laminated steel plate. FIG. 4 is an enlarged vertical sectional view taken along line IV-IV in FIG. 1, showing a state in which the laminated steel plate is crimped into the rotating shaft.

S is a rotating shaft rotatably supported at the center of the housing, and a long groove recess 1 along the longitudinal axis XX of the rotating shaft S is provided on the outer circumferential portion of the rotating shaft S having an outer diameter φD. Is drilled.

The long groove recess 1 is formed so as to be recessed from the outer peripheral surface of the rotating shaft S toward the inside of the shaft, and the length L of the long groove recess 1 in the longitudinal axis XX direction of the rotating shaft S is determined. Is longer than the stacked length 1 of the laminated steel sheets described later. The long groove recess 1 is formed by, for example, milling.

On the other hand, P is a single flat steel plate
A plurality of laminated steel sheets are integrally provided, and an insertion hole 2 is formed in a central portion thereof. Inner diameter φd of this insertion hole 2
Is slightly larger than the outer diameter φD of the rotating shaft S (for example, φD +
20μ).

 That is, φD <φd.

Then, the laminated steel sheet P is integrally attached to the rotating shaft S as follows.

That is, the insertion hole 2 of the laminated steel sheet P is inserted into the rotation shaft S. At this time, the inner diameter φd of the insertion hole 2 is changed to the outer diameter φD of the rotation shaft S.
With a slightly larger diameter, this insertion can be done smoothly without any resistance.

Next, in a state where the laminated steel sheet P reaches a desired position of the rotating shaft S, the vicinity of the insertion holes 2 at both ends of the laminated steel sheet P is directed toward the inside of the long groove recess 1 of the rotating shaft S with a caulking punch K. Press-fit.

Thus, the inner peripheral surface of the insertion hole 2 of the laminated steel sheet P near both ends of the laminated steel sheet P is elastically deformed and penetrates into the long groove recess 1 of the rotating shaft S. The rotary shaft S can be integrally attached. This state is shown in FIG.

The above-mentioned caulking press-fitting operation will be described more specifically with reference to FIG. 5. Reference numeral 5 denotes a fixed lower punch jig, and reference numeral 6 denotes an upper punch jig movable vertically in FIG. is there.

The lower punch jig 5 is provided with a rotating shaft guide hole 5A into which the rotating shaft S is inserted and guides the rotating shaft S, and a laminated steel plate guide hole 5B for guiding the outer diameter of the laminated steel plate P. Shaft guide hole 5A
And the laminated steel plate guide hole 5B are connected by a step 5C, and the upper part of the laminated steel plate guide hole 5B is opened.

Then, in the step 5C, around the opening of the rotary shaft guide hole 5A, the vicinity of the insertion hole 2 of the laminated steel sheet P is pressed to insert the insertion hole 2A.
Is formed by projecting a caulking punch K which elastically deforms and penetrates the inner periphery of the rotary shaft S into the long groove recess 1.

On the other hand, the upper punch jig 6 is opposed to the lower punch jig 5, and a rotary shaft guide hole 6A facing the rotary shaft guide hole 5A of the lower punch jig 5 is formed. A caulking punch K that suppresses the vicinity of the insertion hole 2 of the laminated steel plate P and elastically deforms and inserts the inner periphery of the insertion hole 2 into the long groove recess 1 of the rotation shaft S is provided around the lower opening. Formed.

The lower punch jig 5 is fixedly disposed, and the upper punch jig is movably disposed toward the lower punch jig 5 by a hydraulic cylinder or the like.

Then, the swaging press-fitting operation is performed as follows. That is, the rotating shaft S is inserted into the rotating shaft guide hole 5A of the lower pump jig 5, and then the laminated steel plate P is inserted into the laminated steel plate guide hole 5B.
Insert At this time, the insertion hole 2 of the laminated steel sheet P is
Is inserted into. This state is shown in FIG.

Next, the upper punch jig 6 is pressed and moved toward the lower punch jig 5 by a hydraulic cylinder. According to this, the caulking punch K of the lower punch jig 5 presses the periphery of the insertion hole 2 of the laminated steel plate P located at the lower position, and according to this, the inner periphery of the insertion hole 2 has a long groove recess of the rotation shaft S. 1, while the caulking punch K of the upper punch jig 6 presses around the insertion hole 2 of the laminated steel plate P located at the upper position, and similarly, the inner circumference of the insertion hole 2 is It is elastically deformed into the inside.

As described above, both ends of the laminated steel sheet P can be press-fitted to the rotation axis S.

In the above embodiment, the inner circumference of the laminated steel sheet P was swaged only into the long groove recess 1 of the rotating shaft S, but the inner circumference of the laminated steel sheet P was further swung by the crimping press into the long groove recess 1. S may be elastically deformed and pressed toward the outer circumferential portion R of S. According to this, the attachment strength between the laminated steel sheet P and the rotating shaft S can be further increased. This is shown in FIG. As the caulking punch K used for such caulking press-fitting, an annular punch as shown in FIG. 6 may be used.

Further, the long groove concave portion 1 may be formed only in a portion corresponding to the vicinity of the end of the laminated steel sheet P, whereby the processing time for forming the long groove concave portion 1 can be reduced. This is shown in FIG.

[Effect of the invention]

As described above, the motor according to the present invention has the following effects.

On the outer peripheral surface of the rotating shaft, a long groove recessed along the longitudinal axis of the rotating shaft and inward from the outer peripheral surface is bored.On the other hand, a laminated steel plate formed by laminating a plurality of flat steel plates is In the center, an insertion hole with a diameter slightly larger than the outer diameter of the rotating shaft is drilled, and the insertion hole of the laminated steel sheet is inserted into the rotating shaft. Since the end of the laminated steel plate inserted into the rotating shaft only has to be crimped inward, the working time for attaching the laminated steel plate to the rotating shaft can be greatly reduced. In addition, since the inner periphery of the insertion hole of the laminated steel plate was elastically deformed and press-fitted when attaching the laminated steel plate to the rotating shaft, there was no generation of chips and the removal of the chip removal work was abolished, and the chip was rotated by the rotating shaft. , No longer adheres to the laminated steel sheet.

Furthermore, since the long groove recess provided on the rotating shaft can be mechanically cut, any change is made to the outer diameter of the rotating shaft, which affects the insertion of the laminated steel plate with the insertion hole. Instead, the manufacturing cost was significantly reduced and the quality was improved.

Further, a long groove recessed along the longitudinal axis of the rotating shaft and extending inward from the outer circumferential surface is formed in the outer circumferential surface of the rotating shaft. In the center, an insertion hole with a diameter slightly larger than the outer diameter of the rotating shaft is drilled, and the insertion hole of the laminated steel sheet is inserted into the rotating shaft, and the vicinity of the insertion hole at both outer ends of the laminated steel plate is rotated. According to the press-fitting inward into the long groove recess of the shaft and the press-fitting toward the outer periphery of the rotary shaft, the attachment strength between the rotary shaft and the laminated steel plate could be further increased. So
In particular, it is effective when adopted for a motor having a large driving force.

In addition, according to the fact that a plurality of long groove recesses are formed in the circumferential direction of the rotating shaft, when the laminated steel plate and the rotating shaft are attached, the inner periphery of the insertion hole of the laminated steel plate enters into the long groove recess. The amount can be reduced (since the press-fitting is shared by the plurality of long groove recesses), thereby shortening the press-fitting work and improving the life of the punch jig.

Further, according to the fact that the long groove recess is formed in the rotary shaft located near the outer end of the laminated steel plate, it is sufficient to form the long groove recess only for a relatively short portion of the rotary shaft. The processing time can be reduced.

In addition, since a plurality of long groove recesses are formed in the circumferential direction of the rotating shaft and the respective long groove recesses are provided at special intervals in the circumferential direction of the rotating shaft, the balance at the time of rotation of the rotating shaft is well maintained. This is particularly effective when the number of rotations of the motor is increased, and the wear on the bearing and the sound of the bearing can be largely suppressed by eliminating the center runout of the rotating shaft.

[Brief description of the drawings]

1 to 4 show an embodiment of the motor according to the present invention. 1 is a side view showing a state where a laminated steel plate is attached to a rotating shaft, FIG. 2 is an enlarged longitudinal sectional view of the rotating shaft along the line II-II in FIG. 1, FIG. 3 is an enlarged plan view of the laminated steel plate, FIG. 4 is a longitudinal sectional view taken along the line IV-IV of FIG. 1 and shows a state in which the laminated steel plate is swaged into the rotating shaft. FIG. 5 is a longitudinal sectional view of an essential part showing one embodiment of a method for caulking a laminated steel plate into a rotating shaft, and FIG.
The figure is a longitudinal sectional view showing a state in which the insertion hole of the laminated steel plate is crimped into the long groove recess of the rotating shaft and the outer circumference, and FIG. 7 is a side view showing another embodiment of the long groove recess of the rotating shaft. Fig. 8
FIG. 10 to FIG. 10 show a conventional motor. 8 is a side view showing a state where a laminated steel plate is attached to a rotating shaft, FIG. 9 is an enlarged vertical sectional view of the rotating shaft along line IX-IX in FIG. 8, and FIG. It is an expanded longitudinal cross-sectional view which shows the state which inserted the insertion hole. S: rotating shaft P: laminated steel sheet 1: long groove concave part 2: insertion hole R: outer peripheral part

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Real opening 58-59337 (JP, U) Real opening 48-6502 (JP, U) Real opening 63-1337547 (JP, U) Real opening Hei 2- 118464 (JP, U) JP 48-25561 (JP, B1)

Claims (2)

(57) [Scope of request for utility model registration] 1. A rotating shaft rotatably supported by a housing, a plurality of semi-cylindrical permanent magnets in the housing and arranged concentrically with the rotating shaft, and concentric with the permanent magnet. A laminated steel plate integrally attached to the rotating shaft in a relationship, wherein the motor generates a rotating force by a current flowing between the magnetic field lines and the armature winding by the magnetic field; In addition, a long groove recessed along the longitudinal axis of the rotating shaft and inward from the outer peripheral surface is bored.On the other hand, a laminated steel sheet formed by laminating a plurality of flat steel sheets has Drill an insertion hole slightly larger in diameter than the outer diameter of the rotating shaft, insert the insertion hole of the laminated steel plate into the rotating shaft, and insert the vicinity of the insertion hole at both outer ends of the laminated steel plate into the long groove recess of the rotating shaft. A motor that is press-fitted inward toward the motor. 2. A rotating shaft rotatably supported by the housing, a plurality of semi-cylindrical permanent magnets in the housing and arranged concentrically with the rotating shaft, and a concentric circle with the permanent magnet. A laminated steel plate integrally attached to the rotating shaft in a relationship, wherein the motor generates a rotating force by a current flowing between the magnetic field lines and the armature winding by the magnetic field; In addition, a long groove recessed along the longitudinal axis of the rotating shaft and inward from the outer peripheral surface is bored.On the other hand, a laminated steel sheet formed by laminating a plurality of flat steel sheets has Drill an insertion hole slightly larger in diameter than the outer diameter of the rotating shaft, insert the insertion hole of the laminated steel plate into the rotating shaft, and insert the vicinity of the insertion hole at both outer ends of the laminated steel plate into the long groove recess of the rotating shaft. To the inside of the rotating shaft and press Caulking press-fitted to the motor comprising.