JPH1118353A - Small-sized motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate very easily a parting line formed in the attaching part or an O-ring, and make it very easy to attach the O-ring, by installing an O-ring holder which clamps the O-ring along the insertion direction of a holder base to a motor case. SOLUTION: An O-ring holder has first gap dimension in the radial direction of a motor case 2, between the outer peripheral part of a first insertion part 3c1 of a holder base 3 and the inner peripheral part of a holder base seat 2a1 installed in the motor case 2. When a motor case insertion part 3c of the holder base 3 is inserted in the inside of the motor case 2, a first O-ring 5 is inserted while the holder base 3 is arranged concentrically to a motor case main body 2a by an aligning part 34. The side part on the second insertion part 3c2 side of the holder base 3 abuts against a holder base side stepwise part 3c3 of the holder base 3. The first O-ring 5 is brought into contact with uniform pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor used as a power source such as an actuator for increasing the pressure of brake fluid in an anti-brake lock device for a vehicle.

[0002]

2. Description of the Related Art As a small motor serving as a power source of an actuator or the like in an anti-brake lock device for a vehicle, a holder base 51 is provided inside an open end of a motor case 50 as shown in FIG. ) Ring 52
It is known that the holder base 51 is attached to the inside of the motor case 50 by inserting the front housing 53 outside the open end of the motor case 50. The O (O) ring 52 is fitted into an O-ring mounting groove 51 a formed in a concave shape on the outer peripheral portion of the holder base 51, and is inserted into the motor case 50 together with the holder base 51, so that the motor case 50 and the Holder base 51
To prevent water from entering the motor case 50 from outside.

[0003]

In the above-mentioned small motor, the O-ring mounting groove 51a for fitting the O-ring 52 is directed toward the center of the motor case 50 over the entire outer periphery of the holder base 51. It is formed in a concave groove shape having a depth. Therefore, the parting line generated when the holder base 51 is molded with resin is in the O-ring attachment groove 51a, and if the O-ring 52 is fitted as it is, the O-ring 52 is damaged. However, post-processing was performed to remove the parting line in the O-ring mounting groove 51a from the radial direction of the holder base 51 toward the centripetal direction. If there is a projection such as the connector portion 51b, post-processing from the radial direction of the holder base 51 is difficult, and there is a problem that the number of steps is increased.

In the above-mentioned small motor, since the O-ring mounting groove 51a for fitting the O-ring 52 is formed in a concave groove on the outer periphery of the holder base 51, the O-ring is formed. In mounting the 52, the O (O) ring 52 must be once expanded so as to increase the inner diameter and covered over the outer peripheral portion of the holder base 51, and then moved to the O-ring mounting groove 51a. Since it cannot be said that there is no possibility that the O (O) ring 52 is twisted or partially pulled, there is also a problem that the mounting operation of the O (O) ring 52 can be troublesome.

[0005]

SUMMARY OF THE INVENTION A small motor according to the present invention makes it possible to extremely easily remove a parting line generated at an O-ring mounting portion when a holder base is formed of resin, and to make O-ring mounting very easy. It is an object of the present invention to provide a small-sized motor that can be operated at a high speed.

[0006]

Configuration of the Invention

[0007]

According to a first aspect of the present invention, there is provided a small-sized motor having a motor case and a motor case insertion portion disposed inside the motor case by being inserted toward a cylinder direction of the motor case. A holder base, an O-ring fitted on the holder base in a direction opposite to a direction in which the holder base is inserted into the motor case, and arranged on an outer peripheral portion of the holder base, a magnet arranged inside the motor case, and coupled to a load. An armature having an armature shaft to be rotated and rotating on the inner circumference side of the magnet when energized, and a brush arranged on the holder base on the outer circumference side of the armature commutator,
A brush spring that presses the brush so that it can be electrically connected to the commutator, a brush box that is formed integrally with the holder base and holds the brush and the brush spring on the holder base, and a motor case insertion portion of the holder base. Between the outer circumference and the inner circumference of the motor case,
The present invention is characterized in that an O-ring holder is provided to sandwich the O-ring along a direction in which the holder base is inserted into the motor case.

In the small motor according to a second aspect of the present invention, the O-ring holder includes a motor case side step formed on the inner peripheral portion of the motor case and a motor case extending along a direction in which the holder base is inserted into the motor case. A holder base-side step formed on the outer periphery of the holder base insertion portion facing the side step is provided.

In a small motor according to a third aspect of the present invention, the motor case includes a motor case main body having a magnet attached to an inner peripheral portion thereof, and a holder base receiver having an inner diameter larger than the inner diameter of the motor case main body. And a motor case side step portion disposed between the motor case body and the holder base receiving portion. The holder base includes a holder base body disposed at an end of the motor case, and a holder base. A first insertion portion that is formed to project from the base body into the motor case main body and fits inside the motor case main body of the motor case, and is disposed between the holder base main body and the first insertion portion; A second insertion portion fitted inside the holder base receiving portion; and a second insertion portion disposed between the first insertion portion and the second insertion portion. Holder base side step portion is provided,
The O-ring holder includes a holder base receiving portion of the motor case, a first insertion portion of the holder base facing the holder base receiving portion, a motor case side step portion of the motor case, and a motor case side step portion. And a holder base side step portion of the holder base.

In the small motor according to the present invention, the first insertion portion of the holder base is fitted to the first insertion portion of the O-ring at the tip protruding from the step portion on the holder base side. And a guide portion for guiding the holder base to the inside of the motor case main body of the motor case is formed.

In the small motor according to the fifth aspect of the present invention, when the holder base is inserted inside the motor case, the holder base is arranged concentrically with the motor case when the holder base is inserted into the motor case. The centering portion of the present invention is provided.

[0012]

In the small motor according to the first aspect of the present invention, the O-ring fitted to the outer peripheral portion of the holder base in the same direction as the insertion direction of the motor case into the holder base is such that the holder base is formed of the motor case. When the O-ring holder is inserted inside, the O-ring holder is inserted between the outer periphery of the holder base and the inner periphery of the motor case in the direction of insertion of the holder base into the motor case. Will be retained. Therefore, even if the parting line at the time of resin molding is on the holder base, since the O-ring holder is arranged on the outer peripheral portion of the insertion portion of the holder base inserted inside the motor yoke, The post-processing is performed in the direction of the cylinder of the motor case, and the post-processing is not performed from the radial direction of the holder base to the centripetal direction. And the O-ring is easily held. Also, as compared with the case where the O-ring is inserted into the O-ring mounting groove formed in a concave groove shape on the outer periphery of the holder base, the O-ring is once expanded so as to increase the inner diameter and the outer periphery of the holder base is enlarged. Then, it is not necessary to move to the O-ring mounting groove.

In the small motor according to the second aspect of the present invention, the insertion portion of the holder base is inserted into the inside of the motor case, so that the step portion of the holder base on the side of the holder base relative to the step portion of the motor case on the side of the motor case. Are opposed to each other, and the O-ring is sandwiched and held by the motor case side step portion of the motor case and the holder base side step portion of the holder base. Therefore, in addition to the function of the first aspect, the holder base-side step portion for forming the O-ring holder is easily formed without undercut when the holder base is molded with resin.

According to a third aspect of the present invention, the first insertion portion of the holder base is inserted into the motor case body of the motor case, and the second insertion portion of the holder base is received by the holder base of the motor case. When inserted into the portion, the holder base receiving portion of the motor case, the motor case side step portion of the motor case,
An O-ring holder, which is a ring-shaped space surrounded on all sides by the first insertion portion of the holder base and the holder base-side step portion of the holder base, is formed, and the O-ring is held therein. Therefore, in addition to the function of the first aspect, the O-ring holder is simply formed by the holder base and the motor case simply by inserting the holder base into the motor case.

In the small-sized motor according to the fourth aspect of the present invention, when the O-ring is fitted to the first insertion portion of the holder base, the O-ring is positioned by the guide portion, and the O-ring is inserted into the first insertion portion. It is fitted. Further, when the holder base is inserted inside the motor case body of the motor case, the guide portion formed on the first insertion portion of the holder base guides the insertion direction of the holder base. Therefore, in addition to the function of the third aspect, the O-ring can be easily fitted and the O-ring can be prevented from being damaged by bending and inserting the holder base into the motor case.

In the small motor according to the fifth aspect of the present invention, when the holder base is inserted inside the motor case, the holder base is arranged concentrically with the motor case by the aligning portion. Therefore, in addition to the effect of the first aspect, the O-ring interference in the O-ring holder is made uniform.

[0017]

1 to 8 show one embodiment of a small motor according to the present invention.

The illustrated small motor 1 mainly includes a motor case 2, a holder base 3, a front housing 4,
First O (O) ring 5, first, second, third, fourth magnets 6, 7, 8, 9, armature 10, first brushes 11, 12, 13, 14; Second, third and fourth brush springs 15, 16, 17, 18;
Third and fourth brush boxes 19, 20, 21, 22,
An O-ring holder 23 is provided.

The motor case 2 has a cylindrical motor case body 2a with one end open and a flange 2b formed on the outside. The flange 2b is joined to the front housing 4. As shown in FIG. 2, the motor case 2 has a motor case main body 2a having an inner diameter dimension D1, and one end side of the motor case main body 2a has an inner diameter dimension D2 larger than the motor case main body 2a.
Is formed. The holder base receiving portion 2a1 is connected to the motor case main body 2a via the motor case side stepped portion 2a2, and projects in a single cylindrical shape in the same direction as the cylinder direction of the motor case main body 2a. No post-processing such as cutting is performed on the inner surface of the holder base receiving portion 2a1.

In the motor case 2, the inner peripheral portion of the holder base receiving portion 2a1 and the inner peripheral portion of the motor case side step portion 2a2 form the motor case 2 side of the O-ring holder 23.

The other end side of the motor case main body 2a is a closed plate portion 2c, and a second bearing 24 is mounted on a bearing mounting portion 2c1 formed in a concave shape at the center of the plate portion 2c. . Inside the motor case main body 2a,
Second, third, and fourth magnets 6, 7, 8, and 9 are attached. The first and third magnets 6 and 8 and the second and fourth magnets 7 and 9 generate mutually opposing magnetic forces on the inner peripheral side.

In the front housing 4, a first bearing 25 is mounted on a bearing mounting portion 4a1 formed in a concave shape at the center of a front housing body 4a having a circular plate shape. Bearing mounting part 4a1 of front housing body 4a
On the outer peripheral side of the holder base 3, an annular O-ring housing 4 a 2 is formed in a concave shape on the opposite side of the holder base 3.
The second O-ring 26 is accommodated in the O-ring accommodating portion 4a2. One end of the second O-ring 26 accommodated in the O-ring accommodating portion 4a2 is pressed against the front housing body 4a, while the other end is pressed against the holder base 3.

The front housing 4 has a flange 4b formed outside the front housing body 4a. The flange portion 4b is a flange portion 2b of the motor case 2.
It is joined by being caulked to.

An armature shaft 27 provided in the armature 10 is provided between the first bearing 25 disposed at the center of the front housing 4 and the second bearing 24 disposed at the center of the plate 2c of the motor case 2. Has been inserted.

The armature 10 includes an armature shaft 27, an armature core 28, a commutator 2
9. An armature coil 30 is provided.

The armature shaft 27 has one end of a shaft main body 27a inserted into the first bearing 25 and protrudes to the outside of the front housing 4, and has an output bearing coupled to a pump (not shown) at one end. 31
Is installed.

An armature core 28 is fixed substantially at the center of the armature shaft 27. The armature core 28 has a number of winding portions 28a corresponding to the number of slots.
Are formed.

A commutator 29 is fixed near the armature core 28. On the outer peripheral portion of the commutator 29, the same number of commutator pieces 29a as the winding portions 28a of the armature core 28 are provided, respectively, and after being electrically connected to the commutator pieces 29a, the winding portions of the armature core 28 are respectively provided. Armature coils 30 are respectively wound around 28a.

On the outer periphery of the commutator 29 of the armature 10, first, second, third and fourth brushes 11, 1
2, 13, 14 and first, second, third, and fourth brush springs 15, 16, 17, 18 are arranged on the holder base 3, respectively.

As shown in FIG. 3, the connector portion 3b of the holder base 3 is formed to protrude outside the disc-shaped holder base body 3a. The connector portion 3b is disposed outside the motor case 2, and the first and second terminals 32 and 33 are disposed in the connector portion 3b. The first terminal 32 is connected to the first and third brushes 11 and 13.
Respectively, and the second terminal 33 is connected to the second
The fourth brushes 12 and 14 are electrically connected to each other.

The holder base 3 has a holder base body 3
A cylindrical motor case insertion portion 3c is formed on the outer peripheral portion of a. In this motor case insertion portion 3c,
A first insertion portion 3c1 inserted from the holder base body 3a inside the motor case main body 2a, and a second insertion portion 3c2 formed at a position closer to the holder base body 3a side from the first insertion portion 3c1. A tapered guide portion 3c4 at the tip of the first insertion portion 3c1, and a holder base formed as a step between the first insertion portion 3c1 and the second insertion portion 3c2. A side step portion 3c3 is provided. When the holder base 3 is inserted inside the motor case main body 2a provided in the motor case 2, the holder base side step portion 3c3
The motor case 2 is disposed opposite to the motor case-side stepped portion 2a2 in the cylinder direction of the motor case 2 so as to be separated from the motor case-side stepped portion 2a2.

As shown in FIG. 2, the first insertion portion 3c1 has an outer diameter D3.
And the second insertion portion 3c2 has an outer diameter D4
It has become. Outer diameter dimension D3 of first insertion portion 3c1
Is slightly smaller than the inner diameter dimension D1 of the motor case main body 2a. The outer diameter dimension D4 of the second insertion portion 3c2 is
The outer diameter D2 of the holder base receiving portion 2a1 of the motor case 2 is slightly smaller. The outer diameter dimension D5 of the guide portion 3c4 disposed at the tip of the first insertion portion 3c1 is
It is smaller than the outer diameter dimension D3 of the first insertion portion.

An alignment portion 34 is formed on the second insertion portion 3c2 of the motor case insertion portion 3c. As shown in FIG. 3, six aligning portions 34 are formed at equal intervals on the outer periphery of the second insertion portion 3c2.
As shown in (2), the second insertion portion 3c2 is formed in a rib shape so as to have a length L3 from the base end on the holder base body 3a side to the tip of the second insertion portion 3c2. As shown in FIG. 3, the six centering portions 34 are formed with an outer diameter D7, and the outer diameter D7 of the centering portion 34 is equal to the inner diameter of the holder base receiving portion 2a1 of the motor case 2. It is almost equal to D2.

Since the outer diameter D7 of the aligning portion 34 is substantially equal to the inner diameter D2 of the holder base receiving portion 2a1 of the motor case 2, the motor case insertion portion 3 of the holder base 3 is formed.
When the second insertion portion 3c2 of the holder base is inserted into the holder base receiving portion 2a1 of the motor case 2 by inserting the second insertion portion c into the inside of the motor yoke 2, as shown in FIG. The holder base 2 has a function of slidably contacting the inner peripheral surface of the holder base receiving portion 2a1 and crushing the holder base 3 so as to arrange the holder base 3 at a concentric position of the motor case main body 2a. At this time, since the centering portion 34 has a length L3 in the longitudinal direction of the motor case 2 on the outer peripheral surface of the second insertion portion 3c2, the second portion of the holder base 3 inserted into the motor case 2 Insertion part 3c2
To prevent misalignment.

The aligning section 34 is provided with a first O (O)
Since the first insertion portion 3c1 of the holder base 3 to which the first O (O) ring 5 is fitted is inserted into the inside of the motor case 2 because the holder base 3 is disposed near the ring 5, By arranging the O-ring holder 23 at the concentric position of the case body 2a, the O-ring holder 23 has a function of making the interference of the first O (O) ring 5 uniform.

In the motor case insertion portion 3c, the outer peripheral portion of the first insertion portion 3c1 and the holder base side step portion 3c
The outer periphery of 3 forms the holder base 3 side of the O-ring holder 23.

The O-ring holder 23 holds the motor case 2
The inner peripheral portion of the holder base receiving portion 2a1 and the inner peripheral portion of the motor case side step portion 2a2 respectively formed on the holder base 3 and the first insertion portions 3c formed on the holder base 3 respectively.
1 and an outer peripheral portion of the holder base side stepped portion 3c3 are formed as an annular space surrounded on all sides, and a first O (O) is formed in the O-ring holder 23.
The ring 5 is held.

As shown in FIG. 1, the O-ring holder 23 is provided with a holder base receiving portion 2 provided on the motor case 2 from an outer peripheral portion of the first insertion portion 3c1 of the holder base 3.
A first gap dimension L1 is provided in the radial direction of the motor case 2 between the inner circumference of the motor case 2 and a1. O-ring holder 2
As shown in FIG. 1, a second portion 3 extends in the cylinder direction of the motor case 2 between the motor case-side step portion 2 a 2 provided in the motor case 2 and the holder base-side step portion 3 c 3 provided in the holder base 3. It has a gap dimension L2.

The first O (O) ring 5 is slightly smaller than the outer diameter D3 of the first insertion portion 3c1 of the holder base 3 before being assembled, and the first insertion portion 3c1. Has an inner diameter slightly larger than the outer diameter D5 of the guide portion 3c4 formed at the tip of the guide portion 3c4, so that the inner peripheral portion is aligned with the outside of the guide portion 3c4 to perform positioning with respect to the first insertion portion 3c1. From the outer peripheral portion of the first insertion portion 3c1.

Then, as shown in FIG. 2, the first O (O) ring 5 fitted on the outer peripheral portion of the first insertion portion 3c1 is disposed in contact with the holder base side step portion 3c3. You. At this time, the first O (O) ring 5
Has an outer diameter dimension D6, and the first O (O) ring 5 has a height in the radial direction of the motor case 2 slightly larger than the first gap dimension L1 described above. The width in the cylinder direction is slightly smaller than the second gap L2.

When the motor case insertion portion 3c of the holder base 3 is inserted inside the motor case 2, the first O (O) ring 5 causes the holder base 3 to be concentric with the motor case main body 2a by the aligning portion 34. By being inserted while being arranged, the holder base 3 is arranged within the first gap dimension L1, which is a uniform interference, and the side of the holder base 3 on the side of the second insertion portion 3c2 is the holder base 3.
Abuts on the holder base side step portion 3c3 of
The side portion of the holder base 3 on the guide portion 3c4 side is in contact with the motor case side step portion 2a2 of the motor case 2, the inner peripheral portion is pressed against the outer peripheral surface of the first insertion portion 3c1 of the holder base 3, and the outer peripheral portion is pressed. The portion contacts the inner peripheral surface of the holder base receiving portion 2a1 of the motor case 2. At this time, the first
O ring 5 is pressed against inner peripheral surface of holder base receiving portion 2a1 of motor case 2 and outer peripheral surface of first insertion portion 3c1 of holder base 3 with uniform pressure. .

The O-ring holder 23 is a holder base 3
Between the holder base 3 and the motor case 2 by sandwiching the first O (O) ring 5 in the direction in which the holder base 3 is inserted into the motor case 2 between the outer periphery of the motor case 2 and the inner periphery of the motor case 2. Therefore, even if the parting line at the time of resin molding is on the holder base 3, the O-ring holder 23 is attached to the outer periphery of the motor case insertion portion 3 c of the holder base 3 inserted inside the motor yoke 2. Because it is located in
Post-processing is performed on the holder base 3 in the cylinder direction of the motor case 2, and post-processing is not performed from the radial direction of the holder base 3 toward the centripetal direction. Even if there is such a protrusion, it does not hinder the post-processing. Also, the first O (O) ring 5 is temporarily increased in inner diameter as compared with a case where the O-ring is fitted into an O-ring mounting groove formed in a concave groove shape on the outer peripheral portion of the holder base 3. It is not necessary to move the holder base 3 to the O-ring mounting groove after it is spread and covered on the outer peripheral portion of the holder base 3, and the holder base 3 is mounted on the first insertion portion 3 c of the holder base 3.

The holder base 3 has the motor case insertion portion 3c inserted into the inside of one end side of the motor case 2 via the first O (O) ring 5, and the front surface is attached to the lower surface 3a1 of the holder base body 3a. When the housing 4 abuts, the housing 4 is sandwiched between one end of the motor case 2 and the front housing 4 and is fixed inside the motor case 2.

At the center of the holder base body 3a, a round hole shaft insertion portion 3a2 is formed. One end of the armature shaft 27 is inserted into the shaft insertion portion 3a2.

On the lower surface 3a1 of the holder base body 3a,
As shown in FIG. 4, the O-ring receiving portion 4 of the front housing 4 is located on the outer peripheral side of the shaft insertion portion 3a2.
At a position distant in the outer peripheral direction from a2, a concave and annular vibration absorbing member housing portion 3a3 is formed. The vibration absorbing member 35 is housed in the vibration absorbing member housing portion 3a3.

The vibration absorbing member 35 is formed in a ring shape using an elastic material such as butyl rubber. At this time, when the front housing body 4a of the front housing 4 abuts on the lower surface 3a1 of the holder base body 3a, the holder base 3 is sandwiched between one end of the motor case 2 and the front housing 4, and the front housing 4 is When the front housing 4 and the holder base 3 are joined, there is a gap between the front housing main body 4a and the lower surface 3a1 of the holder base main body 3a due to a variation generated when the front housing 4 and the holder base 3 are formed.

The vibration absorbing member 35 accommodated in the vibration absorbing member accommodating portion 3a3 protrudes into the above-mentioned gap, and the width in the horizontal direction in FIG. 1 is surrounded by the front housing body 4a. Vibration absorbing member housing 3a3
When the front housing 4 is crimped to the motor case 2, the front housing 4 is crushed in the width direction. Therefore, the vibration absorbing member 35 in the gap is
One is pressed against the front housing body 4a, and the other is the vibration absorbing member accommodating portion 3a of the holder base body 3a.
3 is pressed. The vibration absorbing member 35 allows the front housing body 4a to remain in the gap between the front housing body 4a and the lower surface 3a1 of the holder base body 3a even when the vibration of the pump is transmitted from the armature shaft 27 to the front housing body 4a. Has the function of preventing the tapping vibration of the pump from propagating to the holder base main body 3a. The vibration absorbing member 35 is not limited to being formed in a ring shape, but may be
It may be made to protrude to the side and sealed in the vibration absorbing member accommodating portion 3a3.

In the above case, the vibration absorbing member 35 includes the front housing body 4a and the lower surface 3 of the holder base body 3a.
If it is not arranged between the pump and a1, the vibration of the pump will be
Since high-frequency vibrations are generated from the motor case 2, the occupant is particularly uncomfortable. However, the vibration absorbing member 35 is disposed between the front housing body 4a and the lower surface 3a1 of the holder base body 3a. It has been found by experiments that the high-frequency vibrations are eliminated by the operation.

On the upper surface 3a4 of the holder base body 3a,
As shown in FIG. 3, a first brush box 19, a second brush box 20, a third brush box 21,
Fourth brush boxes 22 are respectively formed.

The first brush box 19 is arranged symmetrically to the third brush box 21 and the second brush box 2
0 is symmetrically arranged in the fourth brush box 22,
In the first brush box 19, the first brush 11, the first
Of the second brush box 2
0, the second brush 12 and the second brush spring 16 are housed therein, and the third brush 1
The third brush spring 17 is housed therein, and the fourth brush 14 and the fourth brush spring 1 are accommodated in the fourth brush box 22.
8 are accommodated.

Since the first, second, third, and fourth brush boxes 19, 20, 21, and 22 have the same shape, only the first brush box 19 will be described here. The first brush box 19 includes first and second brush guide portions 19a and 19b which are disposed opposite to each other.
And a first stopper 19c.

A pair of first and second brush guide portions 19
As shown in FIG. 6, a and 19b have a length in the radial direction of the shaft insertion portion 3a2, and are formed in a plate shape from the shaft insertion portion 3a2 toward the outer periphery of the holder base body 3a. Are formed to protrude from the upper surface 3a4.

As shown in FIG. 6, the first brush guide portion 19a has a plate-shaped first brush guide portion main body 19a.
On the second brush guide portion 19b side of a1, a planar first brush support portion 19a2 is formed so as to be substantially orthogonal to the upper surface 3a4 of the holder base body 3a.
The first brush supporting portion 19a2 is used as the holder base body 3
a from the upper surface 3a4 of the first brush 1
1 slightly larger than the height dimension.

As shown in FIG. 6, the tip of the first brush guide portion main body 19a1 has a length along the length direction of the first brush guide portion main body 19a1 and has a first brush support portion. 19a2 from the upper end to the second brush guide 1
A first retaining portion 19a3 protruding toward the 9b side is formed.

As shown in FIG. 6, the first brush guide of the plate-shaped second brush guide main body 19b1 is provided on the second brush guide 19b arranged opposite to the first brush guide 19a. A second flat portion is formed on the side of the portion 19a as substantially orthogonal to the upper surface 3a4 of the holder base body 3.
The brush support portion 19b2 is formed. The second brush support portion 19b2 is located on the upper surface 3 of the holder base body 3a.
The height from a4 is slightly larger than the height of the first brush 15. Second brush support 19b2
And the first brush support 1 of the first brush guide 19a
9a2 is slightly larger than the width of the first brush 11. Then, the second brush support 19
b2 and the first brush support portion 19a2 of the first brush guide portion 19a, the holder base body side brush support portion 3a on the same surface as the upper surface 3a4 of the holder base body 3a.
It is 5.

As shown in FIG. 6, the upper end of the second brush guide portion main body 19b1 has a length along the length direction of the second brush guide portion main body 19b1, and A second retaining portion 19b3 protruding from the upper end of the portion 19b2 toward the first brush guide portion 19a is formed. The distance between the second retaining portion 19b3 and the first retaining portion 19a3 of the first brush guide portion 19a is larger than the width of the first brush 11 and the outer diameter of the first brush spring 15. small. Therefore, the first and second
The first brush 11 and the first brush spring 15 housed inside the brush guide portions 19a and 19b of the
Since it is between the second retaining portions 19a3 and 19b3, it does not pop out.

The holder base body 3a is located between the first brush guide portion 19a and the second brush guide portion 19b.
A flash groove 3a6 is formed in the holder base main body side brush support portion 3a5 formed on the same surface as the upper surface 3a4. The flash relief groove 3a6 is provided at the center between the first brush support 19a2 of the first brush guide 19a and the second brush support 19b2 of the second brush guide 19b. The second brush guide portion 19b is formed to extend downward from the upper surface 3a4 of the holder base body 3a along the length direction. The first brush guide portion 19a and the second brush guide portion 19a are provided on the bottom surface of the flash escape groove 3a6.
A round mold pressing jig insertion hole 3a7 is formed at substantially the center of the length of the brush guide portion 19b.

The mold pressing jig insertion hole 3a7 is formed to penetrate from the lower surface 3a1 of the holder base body 3a to the bottom surface of the flash relief groove 3a6.
Is used to remove a second mold 60 for molding the inner portion of the first brush guide portion 19a and the inner portion of the second brush guide portion 19b. At this time, the mold pressing jig 70 is attached to the lower surface 3 of the holder base body 3a.
The second mold 60 is released by inserting and pressing into the mold pressing jig insertion hole 3a7 from the a1 side. Since the bottom surface of the burr escape groove 3a6 is located at a position lower than the upper surface 3a4 of the holder base body 3a, the second die 60
When the inner portion of the first brush guide portion 19a and the inner portion of the second brush guide portion 19b are formed in the first brush box 19, the upper surface 3a4 side of the mold pressing jig insertion hole 3a7 should be used. Even if burrs are generated, the burrs are arranged in the burr escape grooves 3a6, and the first brush 15 moves inside the first brush box 19.
It has a function to prevent it from protruding on the surface of a5.

The first and second brush guide portions 19a, 19
A first stopper portion 19c is formed at a position slightly away from b along the radial direction of the shaft insertion portion 3a2. The first stopper portion 19c is formed in a plate shape and protrudes from the upper surface 3a4 of the holder base body 3a at an angle orthogonal to the first and second brush guide portions 19a and 19b.

As shown in FIG. 6, the first stopper portion 19c is provided with the holder base body 3a on the first and second brush guide portions 19a, 19b side of the plate-like first stopper portion body 19c1. A first brush spring supporting portion 19c2 having a planar shape is formed so as to be substantially orthogonal to the upper surface 3a4. The height of the first brush spring support 19c2 from the upper surface 3a4 of the holder base body 3a is slightly larger than the outer diameter of the first brush spring 15.
The other end of the first brush spring 15 contacts the first brush spring support 19c2.

The upper end of the first stopper portion main body 19c1 has a length along the longitudinal direction of the first stopper portion main body 19c1, and is located at the first end from the upper end of the first brush spring support portion 19c2. A first slip stopper 19c3 protruding toward the second brush guides 19a and 19b is formed. Since the side of the other end of the first brush spring 15 is locked to the first slip stopper 19c3, the first slip stopper 19c3 is locked.
Reference numeral 3 has a function of preventing the other end of the first brush spring 15 from being displaced from the first brush spring support 19c2. The distance between the ends of the first and second brush guides 19a and 19b of the first slip stopper 19c3 is determined by the length of the first brush 11 and the length of the first brush spring 15. Since it is smaller than the dimensions, the first slip stopper 19c3 and the first and second brush guides 19a, 19b
The first brush 11 and the first brush spring 15 do not protrude.

A first holding plate 19d is formed between the first brush guide 19a and the first stopper 19c, and is formed between the second brush guide 19b and the first stopper 19c. Is formed with a second pressing plate portion 19e.

The height of the first pressing plate 19d is smaller than the height of the first brush guide 19a and slightly larger than the outer diameter of the first brush spring 11. First from the end of the first brush guide portion 19a
Is provided continuously with the stopper portion 19c. The inner surface of the first holding plate portion 19d is provided on the first brush guide portion 19d.
The first brush supporting portion 19a2 has the same plane as the first brush supporting portion 19a2.

The height of the second holding plate 19e is smaller than the height of the second brush guide 19b and slightly larger than the outer diameter of the first brush spring 15. First from the end of the second brush guide portion 19b
Is provided continuously with the stopper portion 19c. The inner surface of the second holding plate portion 19e is in contact with the second brush guide portion 19e.
The second brush supporting portion 19b2 has the same plane as the second brush supporting portion 19b2.

In the first and second holding plate portions 19d and 19e, each height dimension is larger than the outer diameter dimension of the first brush spring 15, and each interval is larger than the outer diameter dimension of the first brush spring 15. Because it is slightly larger than the dimensions,
Even if a bending stress is applied to the first brush spring 15, it has a function of supporting the first brush spring 15 so as not to bend.

In the first brush box 19, the first brush box 19
Brush guide 19a and second brush guide 19b
Between the first brush spring 15 and the first
Brush 11 is inserted, and the first pigtail 36 electrically connected to the first brush 11 is pulled out because it is between the first brush guide portion 19a and the second brush guide portion 19b. It is electrically connected to the terminal 32. When the armature shaft 27 is inserted into the shaft insertion hole 3a2 of the holder base 3, the first brush 11 comes into contact with the commutator piece 29a of the commutator 29. At this time, the first brush spring 15
Has one end locked to the first brush 11, and the other end connected to the first brush spring support 19c of the first stopper 19c.
The first brush 11 is pressed against the commutator piece 29 a of the commutator 29 by the elastic repulsive force accumulated due to the elastic contraction of the commutator 29.

The commutator piece 2 of the commutator 29
The first brush 11 that is in pressure contact with the first brush 9a includes a holder base body-side brush support 3a5 and a first brush guide 19a.
The first brush support portion 19a1 and the second brush support portion 19b1 of the second brush guide portion 19b support the lower and both sides in FIG. First retaining portion 19a3 of 19a
And the second retaining portion 1 of the second brush guide portion 19b.
9b3, the upper part in FIG. 6 is prevented from falling off and is supported, so that it can be moved in the radial direction of the commutator 29 without attaching another component such as a lid member, and is supported in the first brush box 19. Is done.

In the holder base 3, the first brush 11 is pressed by the first brush spring 15 toward the commutator 29 in the first brush box 19, and is accommodated in the second brush box 20. The second spring 11 is moved by the brush spring 16 to the commutator 2.
9, the third brush box 21
The third brush 13 is pressed by the third brush spring 17 toward the commutator 29 and accommodated therein, and the fourth brush spring 18 in the fourth brush box 22 is accommodated therein.
Accordingly, the fourth brush 14 is pressed toward the commutator 29 and accommodated therein.

As shown in FIG. 8, the first brush box 19 is formed by using a first mold 50, a second mold 60, and a mold pressing jig 70.

The first mold 50 is used to form an outer portion of the first brush guide portion 19a, an outer portion of the second brush guide portion 19b, and an outer portion of the first stopper portion 19c. The second mold 60 includes an inner portion of the first brush guide portion 19a and a second brush guide portion 19b.
And the inner portion of the first stopper portion 19c.

The first mold 50 and the second mold 60 are
The respective tips are arranged so as to be aligned, and a third mold (not shown) is arranged away from these in a downward direction in FIG. After the resin material is poured between the first mold 50, the second mold 60, and the third mold, the third mold, the first mold,
Is opened. When the first mold 50 is opened, a second mold 60 is provided inside the first brush guide 19a, inside the second brush guide 19b, and inside the first stopper 19c. The mold pressing jig insertion hole 3a7 is formed by the third mold remaining.

When the first mold 50 is opened,
The second mold 60 is engaged with the first mold 50 and moves upward together with the first mold 50 in FIG. 8, and the mold pressing jig 70 is moved from below in FIG. By being inserted into the tool insertion hole 3a7 and being pressed upward, the second die 60 is pressed upward in FIG. Then, the second mold 60 is pushed upward in FIG. 8 to move the first brush guide portion 19a.
, The inside of the second brush guide portion 19b, and the inside of the first stopper portion 19c, respectively, while moving outward to separate from the holder base molded body 3x. At this time, the inner portion of the first brush guide portion 19a,
Although the inside portion of the brush guide portion 19b and the inside portion of the first stopper portion 19c are undercut, the first mold 50 uses the outside of the first brush guide portion 19a and the second brush guide portion. After the outside of the first stopper 19c and the outside of the first stopper 19c are formed, the second mold 60 is pressed by the mold pressing jig 70 in a direction perpendicular to the length direction of the first brush box 19. As a result, the inner portion of the first brush guide portion 19a, the inner portion of the second brush guide portion 19b, and the inner portion of the first stopper portion 19c are formed by being removed from the holder base molded body 3x. Molding with a simple mold structure is performed without using a mold that is opened in the same direction as the movement direction of the first brush 11, and the length in the movement direction of the first brush 11 is increased. That.

The small motor 1 having such a structure is as follows.
After the inner peripheral portion of the first O (O) ring 5 is fitted to the outside of the guide portion 3c4 of the holder base 3, the first O (O) ring 5 is positioned with respect to the first insertion portion 3c1, and then the first
The O-ring 5 is fitted on the outer peripheral surface of the first insertion portion 3c1, and the motor case insertion portion 3c is inserted inside the motor case 2 with the first insertion portion 3c1 of the holder base 3 first. It is. At this time, the alignment unit 34
As a result, the holder base 3 is arranged concentrically with the motor case main body 2a and inserted, so that the first O (O) ring 5 is held by the O-ring holder 23 having a uniform interference, and the first O ( O) In the ring 5, the side of the holder base 3 on the side of the second insertion portion 3c2 is in contact with the holder base side step 3c3 of the holder base 3, and the side of the holder base 3 on the side of the guide 3c4. The motor case 2 is in contact with the motor case side stepped portion 2a2, and the inner peripheral portion is the first insertion portion 3c1 of the holder base 3.
At a uniform pressure, and the outer peripheral portion thereof is pressed against the inner peripheral surface of the holder base receiving portion 2a1 of the motor case 2 at a uniform pressure.

Then, the lower surface 3a of the holder base body 3a
1 is in contact with the front housing 4 and the motor case 2
The motor case 2 and the front housing 4 are fixed by tightening the flange 2b of the front housing 4 with the flange 2b.

The outer ring of the output side bearing 31 is connected to a pump in the actuator, and the motor case 2 and the front housing 4 are screwed to the case of the actuator.
First and second terminals 32 and 33 in the connector portion 3b are electrically connected to an external anti-brake lock control circuit and mounted on a vehicle.

When the power supply voltage is applied to the first terminal 32 and the second terminal 33 is grounded by operating the anti-brake lock device, the first brush box 19 is connected to the first brush box 19 through the commutator 29. After a current flows through the accommodated first brush 11, the armature coil 30, and the third brush 13 accommodated in the third brush box 17, the current flows through the commutator 29 to the second brush housed in the second brush box 20. Electric current flows through the second brush 12, the armature coil 30, and the fourth brush 18 housed in the fourth brush box 22, and a magnetic force is generated in the armature core 28. Then, the armature 10 is rotated by electromagnetic induction caused by the magnetic force generated by the armature core 28 and the magnetic force generated by the first, second, third, and fourth magnets 6, 7, 8, and 9, and the armature 1 is rotated.
Zero rotational force is applied to the pump through the armature shaft 27, and the pump operates.

As described above, when the holder base 3 is inserted into the inside of the motor case 2, the O-ring holder 23 moves between the outer peripheral portion of the holder base 3 and the inner peripheral portion of the motor case 2 so that the holder base 3 is in contact. 3 is held between the holder base 3 and the motor case 2 by sandwiching the first O (O) ring 5 in the insertion direction with respect to the motor case 2. The O-ring holder 23 is disposed on the outer periphery of the motor case insertion portion 3c of the holder base 3 inserted into the motor yoke 2, so that the O-ring holder 23 is Is performed, and the post-processing is not performed from the radial direction of the holder base 3 toward the centripetal direction.
Even if there is a projection such as the connector portion 3b outside the holder base 3, it does not hinder post-processing. Further, the O-ring is once pushed and expanded so as to increase the inner diameter as compared with the O-ring which is fitted into the O-ring mounting groove formed in the outer peripheral portion of the holder base 3 in the form of a concave groove. There is no need to move to the O-ring mounting groove after covering the outer peripheral portion.

[0078]

As described above, according to the small-sized motor according to the first aspect of the present invention, the motor fitted to the outer peripheral portion of the holder base in the same direction as the insertion direction of the motor case into the holder base. When the holder base is inserted inside the motor case, the O-ring holder is inserted between the outer periphery of the holder base and the inner periphery of the motor case in the direction of insertion of the holder base into the motor case. It is held between the holder base and the motor case. Therefore, even if the parting line at the time of resin molding is on the holder base, since the O-ring holder is arranged on the outer peripheral portion of the insertion portion of the holder base inserted inside the motor yoke, The post-processing is performed in the direction of the cylinder of the motor case, and the post-processing is not performed from the radial direction of the holder base to the centripetal direction. And the O-ring is easily held. In addition, the O-ring is pushed and expanded once so that the inner diameter is larger than that of the O-ring in which the O-ring is fitted into the O-ring mounting groove formed in a concave groove shape on the outer peripheral portion of the holder base. It is not necessary to move to the O-ring mounting groove after covering the part. Therefore, it is possible to easily remove the parting line generated at the mounting portion of the O-ring when the holder base is formed of resin, and it is possible to easily mount the O-ring extremely easily. .

According to the small motor according to the second aspect of the present invention, the insertion portion of the holder base is inserted into the inside of the motor case, whereby the holder base side of the holder base with respect to the motor case side step portion of the motor case. The step portions are arranged to face each other, and the O-ring is sandwiched and held by the motor case side step portion of the motor case and the holder base side step portion of the holder base. Therefore, in addition to the effect of claim 1, there is an excellent effect that the holder base-side step portion for forming the O-ring holder is easily formed without undercut when the holder base is molded with resin. .

According to the small motor according to the third aspect of the present invention, the first insertion portion of the holder base is inserted into the motor case body of the motor case, and the second insertion portion of the holder base is connected to the holder of the motor case. When inserted into the base receiving portion, a holder base receiving portion of the motor case, a motor case side step portion of the motor case,
An O-ring holder, which is a ring-shaped space surrounded on all sides by the first insertion portion of the holder base and the holder base-side step portion of the holder base, is formed, and the O-ring is held therein. Therefore, in addition to the effect of the first aspect, there is an excellent effect that the O-ring holder is simply formed by the holder base and the motor case simply by inserting the holder base into the motor case.

According to the small motor according to the fourth aspect of the present invention, when the O-ring is fitted to the first insertion portion of the holder base, the positioning is performed by the guide portion, and then the first O-ring is inserted. Attached to the part. Further, when the holder base is inserted inside the motor case body of the motor case, the guide portion formed on the first insertion portion of the holder base guides the insertion direction of the holder base. Therefore, in addition to the effect of the third aspect, the O-ring is easily fitted, and the O-ring can be prevented from being damaged by bending and inserting the holder base into the motor case. It works.

According to the small motor according to the fifth aspect of the present invention, when the holder base is inserted inside the motor case, the holder base is arranged concentrically with respect to the motor case by the aligning portion. Therefore, in addition to the effect of the first aspect, there is an excellent effect that the interference of the O-ring in the O-ring holder is made uniform.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of an embodiment of a small motor according to the present invention.

FIG. 2 is a cross-sectional view showing an assembling relationship between a holder base and a motor case used in the small motor shown in FIG.

FIG. 3 is a left side view of a holder base unit used in the small motor shown in FIG. 1;

FIG. 4 is a right side view of a holder base alone used in the small motor shown in FIG. 1;

FIG. 5 is a longitudinal sectional view around a brush box of the small motor shown in FIG. 1;

FIG. 6 is an external perspective view of the small motor shown in FIG. 1 around a brush box.

FIG. 7 is a cross-sectional view around an aligning portion in the small motor shown in FIG.

FIG. 8 is an explanatory cross-sectional view when a holder base used for the small motor shown in FIG. 1 is formed.

FIG. 9 is a sectional view of a conventional small motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small motor 2 Motor case 2a Motor case main body 2a1 Holder base receiving part 2a2 Motor case side step part 3 Holder base 3a Holder base main body 3c Motor case insertion part 3c1 First insertion part 3c2 Second insertion part 3c3 Holder base side step Part 3c4 guide part 5 (O-ring) first O (O) ring 6 (magnet) first magnet 7 (magnet) second magnet 8 (magnet) third magnet 9 (magnet) fourth magnet 10 Armature 11 (brush) 1st brush 12 (brush) 2nd brush 13 (brush) 3rd brush 14 (brush) 4th brush 15 (brush spring) 1st brush spring 16 (brush spring) 2nd Brush spring 17 (brush spring) third brush spring 18 Brush spring) fourth brush spring 19 (brush box) first brush box 20 (brush box) second brush box 21 (brush box) third brush box 22 (brush box) fourth brush box 23 Ring holder 27 Armature shaft 34 Alignment part

Claims (5)

[Claims] 1. A motor case, a holder base having a motor case insertion portion disposed inside the motor case by being inserted toward the cylinder direction of the motor case, and inserting the holder base into the motor case. An O-ring fitted in the opposite direction to the holder base and disposed on the outer peripheral portion of the holder base; a magnet disposed inside the motor case; and an armature shaft coupled to a load. An armature rotating on the inner peripheral side of the armature; a brush disposed on the holder base on an outer peripheral side of a commutator of the armature; and a brush spring for pressing the brush so as to be electrically connectable to the commutator. The brush and the brush spring are formed integrally with the holder base, A brush box to be held on a holder base, and between the outer peripheral portion of the motor case insertion portion of the holder base and the inner peripheral portion of the motor case, the O-ring is inserted along the insertion direction of the holder base into the motor case. A small motor comprising an O-ring holder to be sandwiched. 2. An O-ring holder comprising: a motor case-side step formed on an inner peripheral portion of a motor case; and a holder base opposed to the motor case-side step along a direction in which the holder base is inserted into the motor case. The small motor according to claim 1, further comprising a holder base-side step formed at an outer peripheral portion of the insertion portion. 3. A motor case having a motor case main body having a magnet attached to an inner peripheral portion thereof, a holder base receiving portion having an inner diameter larger than the inner diameter of the motor case main body, a motor case main body and a holder base. A motor case side step portion is provided between the receiving portion and the holder. The holder base includes a holder base body disposed at an end of the motor case, and a holder base body provided in the motor case body. A first insertion portion which is formed to project and is fitted inside the motor case body of the motor case;
A second insertion portion disposed between the holder base body and the first insertion portion and fitted inside the holder base receiving portion of the motor case; and a second insertion portion between the first insertion portion and the second insertion portion. An O-ring holder, a holder base receiving portion of the motor case, a first insertion portion of the holder base facing the holder base receiving portion, and a motor case side of the motor case. The small motor according to claim 1, wherein the small motor is formed of a step portion and a holder base side step portion of the holder base facing the motor case side step portion. 4. A first insertion portion of the holder base,
At the tip protruding from the holder base side step, the fitting of the O-ring to the first insertion portion is guided,
The small motor according to claim 3, wherein a guide portion for guiding the holder base inside the motor case body of the motor case is formed. 5. The motor case insertion portion of the holder base includes an aligning portion for arranging the holder base concentrically with the motor case when the holder base is inserted inside the motor case. Claim 1.
The small motor according to the above.