JPH10174347A - Dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the temperature management of the casing body, and raise the degree of freedom in the incorporation work period to the first bracket of a bearing metal, in a DC motor where the bearing metal having a spherical external surface is born oscilatably by the first bracket that the casing body made of synthetic resin possesses integrally, and one end of the rotary shaft that the rotor possesses is born rotatably by the bearing metal. SOLUTION: The first fitting recess 25 which has a spherical internal surface and the second fitting recess 27 with a larger diameter than the recess 25 form a step 26 between each other, and a metal holder 28 provided at the internal surface of the first bracket 3 and made of metal is engaged and fixed to the recess 27, with the tip of its engaging collar 28c biting in the recess 27, and the inside retainer part 28b of the metal holder 28 abuts elastically on the external surface of the projection of the bearing metal 16 from the recess 25, and the aligning bearing metal 16 is born oscilatably between the internal surface of the recess 25 and the metal holder 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cylindrical yoke in which magnets are provided at a plurality of positions spaced apart in the circumferential direction, and a first bracket is integrally provided at one end of a cylindrical portion to which the yoke is integrally connected. The casing is composed of a casing main body formed of a synthetic resin having a bottomed cylindrical shape and a second bracket coupled to the other end of the casing main body, and includes a rotor coaxially arranged in the casing. One end of the rotating shaft is rotatably supported by a centering bearing metal which is formed in a cylindrical shape having a spherical outer surface and is swingably supported by the first bracket, and other than the rotating shaft passing through the second bracket. The present invention relates to a DC motor in which a bearing member is provided between an end side and a second bracket.

[0002]

2. Description of the Related Art Conventionally, such a DC motor is known, for example, from Japanese Patent Application Laid-Open No. Hei 8-33297, in which an aligning bearing metal is press-fitted into a first bracket immediately after molding of a casing mainly composed of a synthetic resin. I have.

[0003]

However, if the aligning bearing metal is press-fitted into the first bracket as in the prior art described above, the first bracket, that is, the casing main body is at a relatively high temperature immediately after molding. In this case, it is necessary to perform the press-fitting work of the centering bearing metal, and it is necessary to control the temperature of the casing, and the mounting time of the centering bearing metal to the first bracket is limited. Is narrowed.

The present invention has been made in view of the above circumstances, and eliminates the need for temperature control of the casing main body, and performs assembly work of the centering bearing metal on the first bracket even when the casing main body is at room temperature. It is an object of the present invention to provide a DC motor in which the degree of freedom in assembling work time is increased.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a cylindrical portion in which magnets are provided at a plurality of positions spaced apart in a circumferential direction of a cylindrical yoke, and the yokes are integrally connected. A casing is composed of a casing main body formed of a synthetic resin in a cylindrical shape with a bottom having a first bracket integrally provided at one end of the casing, and a second bracket coupled to the other end of the casing main body. One end of a rotating shaft provided in a rotor coaxially disposed therein is rotatably supported by an aligning bearing metal which is formed in a cylindrical shape having a spherical outer surface and is swingably supported by the first bracket, In a DC motor, wherein a bearing member is provided between the other end of the rotating shaft penetrating the second bracket and the second bracket, the centering shaft has a spherical inner surface on the inner surface of the first bracket. An annular step is formed between the first fitting recess for fitting a part of the metal and the outer end of the first fitting recess, and the second fitting recess is formed to have a larger diameter than the first fitting recess. A fitting recess is provided, and an annular base contacting the step portion and a first fitting for exerting an elastic force for pressing the centering bearing metal toward a spherical inner surface of the first fitting recess. A holding portion which is continuously provided at a plurality of locations spaced in the circumferential direction on the inner periphery of the base portion in contact with the projection outer surface of the centering bearing metal from the mating recess;
A metal-made metal holder having a fitting cylinder portion formed in a tapered shape having a large diameter as the base end is continuously provided on the outer periphery of the base portion and separated from the base portion, the distal end of the fitting cylinder portion is formed. It is characterized by being cut into the inner surface of the second fitting recess and fixed to the first bracket.

According to such a configuration, a part of the aligning bearing metal is fitted into the first fitting recess of the first bracket,
A metal holder is fixed to the first bracket such that the fitting cylindrical portion is fitted into the second fitting concave portion and the tip of the fitting cylindrical portion is cut into the inner surface of the second fitting concave portion. The holding portion provided in the first contact portion comes into contact with the outer surface of the projecting portion of the aligning bearing metal from the first fitting concave portion, thereby preventing the aligning bearing metal from falling off from the first fitting concave portion. 1 The bracket is held between the bracket and the metal holder, so that the synthetic resin casing main body does not need to be in a relatively high temperature state, and the centering bearing metal can be assembled to the normal temperature casing main body. Thus, the degree of freedom of the assembling operation time can be increased. In addition, the holding portion exerts a resilient force for pressing the aligning bearing metal toward the spherical inner surface of the first fitting recess, and the aligning bearing metal has a spherical shape in the first fitting recess. A swingable support can be provided between the inner surface and the holding portion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

1 to 3 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a DC motor, and FIG.
FIG. 3 is a front view of the metal holder.

First, in FIG. 1, this DC motor is connected to, for example, a hydraulic pump for tilt-up operation of an outboard motor, and a casing 1 of the casing 1 is provided with a first bracket 3 at one end of a cylindrical portion 2. The casing main body 4 is formed of a synthetic resin having a bottomed cylindrical shape and a second bracket 5 formed of a synthetic resin and coupled to the other end of the casing main body 4.

At the other end of the cylindrical portion 2 of the casing main body 4, there are provided flanges 6 projecting outward in the radial direction at four positions equally spaced in the circumferential direction. Are embedded in a cylindrical sleeve 7 made of metal. On the other hand, the second bracket 5 is formed in a disk shape so as to close the other end of the cylindrical portion 2 and includes flange portions 8... Corresponding to the respective flange portions 6 of the cylindrical portion 2. Yes,
Insert holes 9 corresponding to the respective sleeves 7 are provided with respective flange portions 8.
Is provided. The bolts 10 inserted into the sleeves 7 and the insertion holes 9 respectively are attached to the second bracket 5.
Of the casing 1 is screwed to a support 11 disposed so as to be sandwiched between the casing 1 and the casing 1.
Fixed to 1.

The casing main body 4 includes a yoke 1 formed in a cylindrical shape from a magnetic metal and provided on an inner periphery of the cylindrical portion 2.
2 and magnets 13 which are formed in an arc shape corresponding to the inner peripheral surface of the yoke 12 and are arranged on the inner surface of the yoke 12 at a plurality of locations, for example, two locations, which are equally spaced in the circumferential direction of the yoke 12. Are joined together.

In the cylindrical portion 2 of the casing main body 4, the first
The rotor 14 rotatably supported by the second brackets 3 and 5 is arranged concentrically. That is, one end of the rotating shaft 15 provided in the rotor 14 is supported by the first bracket 3 via the centering bearing metal 16. Although not shown,
A plate is interposed between one end of the rotating shaft 15 and the first bracket 3. The other end of the rotating shaft 15 extends through the second bracket 5 toward the support 11, and is provided between the second bracket 5 and the rotating shaft 15 as a cylindrical roller bearing 17 and an annular sealing member 18 as bearing members. Is interposed.

A commutator 19 is provided on the second bracket 5 side of the rotating shaft 15. On the other hand, the second bracket 15 has a plurality of recesses 2 opened to the commutator 19 side.
.. Are provided, the recesses 20... And each recess 20.
Between the holder 21 and the holder 21 attached to the inner surface of the second bracket 5 so as to cover the
Are slidably held, and each of the brushes 22 is compressed between the second bracket 5 and the spring 2.
.. Are urged toward the side that comes into sliding contact with the commutator 19. Cords 24 are respectively connected to the brushes 22. These cords 24 are pulled out from the first bracket 3.

In FIG. 2, the centering bearing metal 16 has a support hole 16a at its center, which rotatably supports one end of the rotating shaft 15 and penetrates it, and is formed in a cylindrical shape by metal. The outer surface of the aligning bearing metal 16 is formed in a spherical shape. On the other hand, a first fitting concave portion 25 having a spherical inner surface into which a part of the centering bearing metal 16 is fitted so as to be able to swing, and a first fitting concave portion 25 are provided on the inner surface of the central portion of the first bracket 3. An annular step 26 is formed between the outer end and
Second fitting recess 27 formed to be larger in diameter than fitting recess 25
The metal bearing 28 and the first bracket 3, which are fitted and fixed in the second fitting recess 27 with the aligning bearing metal 16 partially fitted in the first fitting recess 25, are provided. And supported by the first bracket 3 so as to be able to swing.

Referring also to FIG. 3, the metal holder 28
Include a base portion 28a formed in an annular shape, holding portions 28b, 28b... Which are continuously provided at a plurality of locations, for example, six locations, which are spaced apart in the circumferential direction of the inner circumference of the base portion 28a. Is formed by pressing a plate made of metal (for example, JIS S65CM).

The holding portions 28b, 28b are connected to the base 28a of the metal holder 28 by the first and second fitting recesses 27, 2 respectively.
7, the first fitting recess 25
The outer peripheral surface of the centering bearing metal 16, a part of which is fitted in the first fitting concave portion 25, is resiliently contacted at a plurality of circumferentially spaced locations on the outer surface. The core bearing metal 16 prevents the center bearing metal 16 from dropping out of the first fitting recess 25, and exerts a resilient force for pressing the centering bearing metal 16 against the spherical inner surface of the first fitting recess 25.

The fitting cylindrical portion 28c is formed in a tapered shape having a larger diameter as it separates from the base portion 28a.
In the state where the fitting cylindrical portion 28c is fitted in the second fitting concave portion 27 until the base portion 28a contacts the step portion 26,
The distal end of the fitting cylindrical portion 28c bites into the inner surface of the second fitting recess 27, whereby the metal holder 28 is fixed to the first bracket 3. At this time, the fitting cylinder 2
In order to ensure that the distal end of 8c penetrates into the inner surface of the second fitting recess 27, it is desirable that the second fitting recess 27 is formed in a tapered shape having a smaller diameter as it moves away from the step portion 26.

Next, the operation of this embodiment will be described. A part of the aligning bearing metal 16 is fitted into the first fitting concave portion 25 provided in the first bracket 3, and the fitting cylindrical portion 28c is fitted. The tip of the second fitting recess 27
The plurality of holding portions 28b, 28 of the metal holder 28 fixed to the first bracket 3
b contact the outer surface of the protruding portion of the aligning bearing metal 16 from the first fitting concave portion 25, so that the aligning bearing metal 16
Is prevented from falling out of the first fitting concave portion 25, and the centering bearing metal 16 is sandwiched between the first bracket 3 and the metal holder 28.

Therefore, as compared with the case where the aligning bearing metal 16 is press-fitted into the first bracket 3 which is in a relatively high temperature immediately after the molding of the synthetic resin casing main body 4, the casing main body 4 is formed. It is not necessary to make a relatively high temperature state a necessary condition, and it is possible to mount the aligning bearing metal 16 on the casing main body 4 at normal temperature. As a result, the temperature control of the casing main body 4 becomes unnecessary, and the timing of assembling the aligning bearing metal 16 to the first bracket 3 is not limited, and the degree of freedom of the assembling work time can be increased.

In addition, since the tip of the fitting cylindrical portion 28c cuts into the inner surface of the second fitting recess 27, the metal holder 28 is securely fixed to the first bracket 3, and the first bracket 3 of the aligning bearing metal 16 is secured. Can be carried out more firmly and reliably.

The holding portions 28b, 28b,... Exert a resilient force to press the centering bearing metal 16 toward the spherical inner surface of the first fitting recess 25, so that the base portion 28
a, the centering bearing metal 16 is connected to the first fitting concave 2
5 can be swingably supported between the spherical inner surface and each of the holding portions 28b.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, the yoke 12 is provided on the inner surface side of the cylindrical portion 2 of the casing main body 4. However, the present invention is also applied to a DC motor in which the yoke 12 is provided on the outer surface side of the cylindrical portion 2. It is possible. Further, a slit may be provided at the distal end of the fitting cylindrical portion 28c so that the distal end of the fitting cylindrical portion 28c has elasticity along the radial direction. The fitting operation to the two fitting recesses 27 becomes easy.

[0024]

As described above, according to the present invention, the metal holder allows the fitting cylindrical portion to fit into the second fitting concave portion and the tip of the fitting cylindrical portion to bite into the second fitting concave portion. The plurality of holding portions of the metal holder, which are firmly fixed to the first bracket so as to be in contact with each other, come into contact with the outer surfaces of the projecting portions of the aligning bearing metal from the first fitting recesses, so that the first bracket and the metal holder are provided. Since the bearing metal is sandwiched between the casings, the centering bearing metal can be fixed to the main body of the casing at room temperature, and the degree of freedom of the assembling operation time can be increased.
In addition, since the centering bearing metal is resiliently biased toward the spherical inner surface of the first fitting recess by each holding portion, the alignment between the spherical inner surface of the one fitting recess and each holding portion is adjusted. The core bearing metal can be swingably supported.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a DC motor.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a front view of a metal holder. DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Cylindrical part 3 ... 1st bracket 4 ... Casing main body 5 ... 2nd bracket 12 ... Yoke 13 ... Magnet 14 ... Rotor 15 ... Rotating shaft 16: Aligned bearing metal 17: Cylindrical roller bearing as bearing member 25: First fitting recess 26: Step 27: Second fitting recess 28: Metal Holder 28a: Base 28b: Holder 28c: Fitting tube

Claims (1)

[Claims] 1. A magnet (13) is provided at a plurality of positions spaced apart in a circumferential direction of a cylindrical yoke (12), and a magnet (13) is provided at one end of a cylindrical portion (2) to which the yoke (12) is integrally joined. A casing main body (4) formed of a synthetic resin in the form of a bottomed cylinder formed integrally with one bracket (3), and a second bracket (5) coupled to the other end of the casing main body (4). And a casing (1), and the rotor (1) coaxially arranged in the casing (1).
One end of a rotating shaft (15) provided in 4) is formed in a cylindrical shape having a spherical outer surface, and is rotatably supported by a centering bearing metal (16) supported on the first bracket (3) so as to swing. Inner surface of the first bracket (3) in a DC motor supported and provided with a bearing member (17) between the other end of the rotating shaft (15) penetrating the second bracket (5) and the second bracket (5). A first fitting recess (25) having a spherical inner surface and fitting a part of the centering bearing metal (16), and an outer end of the first fitting recess (25). A second fitting recess (27) which forms an annular step (26) and has a larger diameter than the first fitting recess (25);
An annular base (28a) contacting the step (26);
The first aligning bearing metal (16) is firstly pressed to exert a resilient force for pressing the metal toward the spherical inner surface of the first fitting recess (25).
The holding portion () is provided at a plurality of circumferentially spaced locations on the inner periphery of the base portion (28 a) in contact with the outer surface of the projecting portion of the aligning bearing metal (16) from the fitting recess (25). 28
b) and a fitting cylindrical portion (28c) formed in a tapered shape having a base end connected to the outer periphery of the base portion (28a) and having a larger diameter as the distance from the base portion (28a) increases. Of the fitting cylindrical portion (28)
A DC motor characterized in that the tip of (c) is fixed to the first bracket (3) by cutting into the inner surface of the second fitting recess (27).