JP2003088043A - Motor for pumping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor for pumping which raises the rigidity of a bearing holder provided at a bracket so as to hold a bearing on the rotary shaft of a motor. SOLUTION: The bearing holder 58 of the bracket 56 comprises an outer barrel 58a which projects outward of a motor housing 48 from the center of the bracket 56, and an inner barrel 58b which is turned at the outside end of the outer barrel 58a and is extended in the direction of the motor housing 48 while contacting with the inwall face of the outer barrel 58a and accommodates and holds a bearing 60 therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump operating motor used in, for example, a vehicle brake fluid pressure control device.

[0002]

2. Description of the Related Art In a vehicle brake fluid pressure control device, for example, an antilock brake device, a pump is provided in a fluid pressure circuit connected to the reservoir in order to return the brake fluid stored in the reservoir to the brake master cylinder side. ing. This pump is operated by a motor to return the brake fluid to the master cylinder side.

FIG. 4 shows the structure of a conventionally known pump operating motor (hereinafter sometimes simply referred to as a motor), and the structure of the conventional motor will be described based on this structure. The motor 10 is attached to the metal block body (base body) 9 described above. Motor housing 12
Is formed in a cylindrical shape having a bottom, and the bearing holding portion 13 is formed on the bottom surface.
Is formed and the bearing 15 is provided inside. Also,
An arc-shaped magnet 14 is attached to the inner peripheral surface of the motor housing 12 along the circumferential direction. At the opening of the motor housing 12, a bracket 1 covering the opening is provided.
6 is attached. A cylindrical bearing holder 18 is formed at the center of the bracket 16 so as to project outward, and a bearing 20 is accommodated in the bearing holder 18. The bearing holding portion 18 is formed by pressing the bracket 16.

The rotor 21 is housed in the motor housing 12, one end side 22a of the rotary shaft 22 thereof is supported by the bearing 20 held by the bracket 16, and the other end side 2
2b is supported by a bearing 15 held by the motor housing 12 so that it can rotate. A tip portion of the rotor 21 on one end side of the rotary shaft 22 projects from the bearing holding portion 18 of the bracket 16 as an output shaft. An eccentric shaft portion 23 that is formed eccentrically with respect to the axis of the rotary shaft 22 and that operates as a cam is provided on a part of the rotary shaft 22 that protrudes from the bearing holding portion 18 of the bracket 16. As the rotating shaft 22 rotates, the eccentric shaft portion 2
3 activates a plunger pump (not shown).

A commutator 26 is provided on the opening side of the rotary shaft 22 located inside the motor housing 12, and a brush 28 is provided so as to surround the rotary shaft 22 so as to be in contact with the commutator 26. Reference numeral 27 is a rotor core. The rotor core 27, the commutator 26, the brush 28, and the rotating shaft 22 form the rotor 21.

[0006]

Conventional bracket 16
The bearing holding portion 18 is a mere recess formed so as to project toward the block body 9, and the bearing 15 is press-fitted and held therein. On the other hand, since the load of the rotary shaft 22 of the motor 10 is applied to the bearing holder 18, the rigidity of the bearing holder 18 should be set as high as possible. However, under the present circumstances where the plate thickness of the bracket 16 has to be made thinner than that of the conventional one in order to reduce the weight of the entire motor, the conventional plate having the same plate thickness as the bracket 16 as a whole is used. In the bearing holding part having such a structure, there is a problem that the plate thickness is small and the rigidity becomes weak to hold the rotating shaft.

Further, the grease applied to the bearing 15 of the rotating shaft 22 moves to the inside of the motor 10 or the brush 2
It is necessary to prevent foreign substances from moving inside and outside the motor 10 when dust or the like generated between the motor 8 and the commutator 26 moves to the block body 9 side.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to operate a pump for increasing the rigidity of a bearing holding portion provided on a bracket for holding a bearing of a rotating shaft of a motor. To provide a motor.

[0009]

That is, according to the pump operating motor of the present invention, there is provided a motor housing which is formed in a cylindrical body having a bottom and in which a bearing is arranged on the inner bottom surface side.
A bracket, which is attached to the opening of the motor housing so as to cover the opening, and in which a bearing is arranged in a bearing holding portion provided in the center, a brush holder provided near the bracket in the motor housing, A rotor in which one end of the shaft is housed in the motor housing in a state of protruding from the bearing holding portion of the bracket, and the rotary shaft is rotatably supported by the bearings held by the motor housing and the bracket. In the pump operating motor having: and the bearing holding portion, the bearing holding portion is folded back at an outer tubular portion protruding from the central portion of the bracket toward the outside of the motor housing, and an outer end portion of the outer tubular portion. And an inner cylinder portion that extends in the motor housing direction while contacting the inner wall surface of the outer cylinder portion and accommodates and holds a bearing therein. It is characterized. According to this configuration, since the bearing is accommodated and held by the bearing holding portion having the double-walled structure including the inner tubular portion and the outer tubular portion, the bearing holding portion has high rigidity,
The rotation shaft can be held securely.

Further, there is provided a ring-shaped partition wall portion extending from the end portion of the inner cylinder portion on the motor housing side toward the center of the inner cylinder portion and formed so as to surround the periphery of the rotating shaft. It has a feature. Since the inside and outside of the motor are blocked by the partition wall in this way, the grease applied to the bearing moves to the inside of the motor, and dust generated between the brush and the commutator moves to the block side. It is possible to prevent foreign matter from moving inside and outside the motor.

Since the bearing holding portion is characterized in that the outer end portion is bent toward the center to hold the bearing, the bearing does not easily come off from the bearing holding portion, and the bearing is held securely. Becomes

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, an outline of the entire structure of the brake fluid pressure control device to which the motor of this embodiment is attached will be described with reference to FIG. The motor 40 is attached to a metal block body 39 having a block-shaped outer shape. Plural plunger pumps, an electronic control unit (ECU) 41, a solenoid 43, and the like, which are not shown, are provided in the block body 39. The plunger pump abuts on an eccentric shaft portion 45 provided on a rotary shaft 44 of the motor 40, and is driven by a piston (not shown) that reciprocates by the rotation of the eccentric shaft portion 45.

The solenoid 43 is provided to open and close a valve (not shown) provided in each cylinder of the wheel brake. The electronic control unit 41 can control the valves and the motor by inputting the traveling state of the vehicle from a wheel speed sensor (not shown) provided on each wheel. Reference numeral 47 is a terminal provided for supplying power from the electronic control unit 41 to the motor 40.

Next, the structure of the motor according to the present invention will be described. The motor 40 has a rotor 50 housed in a motor housing 48, and is attached to the block body 39 such that one end side 44 a of a rotary shaft 44 on which the rotor 50 is provided enters the block body 39. As described in the related art, the motor housing 48 is formed in a bottomed cylindrical shape, and the bearing holding portion 51 is formed on the bottom surface. A bearing 52 is press-fitted and held in the bearing holding portion 51. An arcuate magnet 54 is attached to the inner peripheral surface of the motor housing 48 along the circumferential direction. A bracket 56 that covers the opening is attached to the opening of the motor housing 48. A bearing holding portion 58 is formed at the center of the bracket 56 so as to project outward. A bearing 60 is press-fitted and held in the bearing holding portion 58.

A commutator 62 is provided near the opening of the rotary shaft 44. On the inner surface of the bracket 56,
A brush 64 is arranged so as to surround the rotating shaft 44 so as to contact the commutator 62. The brush 64 is biased in the direction of the commutator 62 by the spring 65 and constantly contacts the commutator 62. One end side 44a of the rotating shaft 44
(The right end in FIG. 1) is supported by the bearing 60 held by the bracket 56 and the bearing 68 held in the cam chamber 69 of the block body 39, and the other end side 44b (the left end in FIG. 1). Is supported by a bearing 52 held by the motor housing 48, so that it is rotatable.

When the motor 40 is attached to the block body 39, one end side 44a of the rotary shaft 44 protruding from the bracket 56 enters the inside of the block body 39, and the eccentric shaft portion 45 drives a pair of plunger pumps. To do. Motor 4
0 indicates that one end side 44a of the rotary shaft 44 is the block body 3
The bearing holding portion 58 of the bracket 56 is fitted into the positioning portion 70, and is attached to the block body 39.

Next, the structure of the bearing holding portion formed on the bracket will be described with reference to FIGS. FIG. 2 shows an enlarged view of the portion A shown in FIG. 1, and FIG. 3 shows an enlarged view of the bearing holding portion 58 of the bracket 56. The bearing holder 58 is
The whole is formed as a double wall structure in which two metal pieces forming the bracket 56 are stacked. That is, the entire bearing holding portion 58 is formed by superimposing the outer tubular portion 58a located on the outer side and the inner tubular portion 58b provided along the inner wall surface of the outer tubular portion 58a. The outer tubular portion 58a is formed so as to project outward (to the block body 39 side) from the center of the bracket 56, and the outer end portion 5 thereof is formed.
An inner cylinder portion 58b that is folded back from 9 and extends toward the inside (motor housing 48 side) is formed.

On the motor housing 48 side of the bearing holder 58, the inside of the motor housing 48 and the motor housing 48 are
A partition 72 is formed so as to be isolated from the outside. The partition wall portion 72 has a ring shape and is formed so as to project from the end portion of the inner tubular portion 58b on the motor housing side toward the center direction of the bearing holding portion 58 so as to surround the rotary shaft 44. Further, since the partition wall portion 72 closes the gap between the rotary shaft 44 and the inner wall surface of the inner cylinder portion 58b, the through hole 75 having a diameter through which the rotary shaft 44 penetrates and is rotatable in the central portion. Are formed.

Further, as shown by the broken line portions in FIGS. 2 and 3, the bearing holding portion 58 is formed by accommodating the bearing 60 inside and then bending the outer end portion 59 toward the center. Good. By thus bending the bearing holder 58 toward the center, the bearing 60 can be reliably held. Specifically, after the bearing 60 is held, the vicinity of the outer end portion 59 of the bearing holding portion 58 is caulked to bend the outer end portion 59 toward the center.

Such a bearing holding portion can be formed by pressing (drawing). Hereinafter, a method of forming the bearing holding portion 58 by pressing will be described. That is, first, in the central portion of the flat plate-shaped bracket 56, press working is performed with a punch having a predetermined diameter,
A protrusion that protrudes from the inside of the motor housing 48 toward the outside is formed. Then, a punch different from the previously used punch and having a diameter smaller than the diameter of the previously used punch is used to press the formed protruding portion.
Specifically, the punch is operated from the outside to the inside of the motor housing 48, that is, in the direction opposite to the direction in which the protrusion is formed, and press working is performed to bend the protrusion inward. Then, the tip of the protruding portion is bent to form the inner tubular portion 58b, and the inner tubular portion 58b is formed along the inner wall of the outer tubular portion 58a. The inner cylinder portion 58b is formed up to the bottom surface of the bracket 56. Next, a punching process is performed on the end surface of the formed inner cylindrical portion 58b on the motor housing 48 side to form a through hole 75 into which the rotating shaft 44 is inserted. The diameter of the through hole 75 is determined by the diameter of the punch for punching used in this punching process.

Although the present invention has been variously described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0022]

According to the pump operating motor of the present invention, the rigidity of the bearing holding portion that holds the rotating shaft of the pump operating motor can be increased, and the rotating shaft can be held reliably. In addition, since the ring-shaped partition wall portion that is formed so as to project from the end portion of the inner cylinder portion on the motor housing side toward the center direction of the inner cylinder portion and surround the periphery of the rotation shaft is provided,
Prevents foreign matter from moving inside and outside the motor, such as the grease applied to the bearings moving to the inside of the motor, and dust generated between the brush and commutator moving to the block side. Can be smoothly rotated. Further, since the bearing holding portion holds the bearing by bending the outer end portion toward the center, the bearing can be held reliably.

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall structure of a brake fluid pressure control device to which a pump operating motor according to the present invention is attached.

FIG. 2 is an enlarged cross-sectional view of the vicinity of a bearing holding portion of the bracket of the pump operating motor shown in FIG.

FIG. 3 is a cross-sectional view of the bracket shown in FIGS. 1 and 2.

FIG. 4 is a cross-sectional view of a conventional pump operating motor.

[Explanation of symbols]

39 blocks 40 motor 41 Electronic control unit 43 solenoid 44 rotation axis 45 Eccentric shaft 47 terminal 48 motor housing 51,58 Bearing holder 58a Outer cylinder part 58b Inner tube part 52,60,66,68 bearings 54 magnet 56 bracket 59 Outer end 62 commutator 64 brushes 65 spring 69 cam room 70 Positioning unit 72 Partition

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoshi Tamai             840 Kokubu, Ueda City, Nagano Prefecture Nisshin Kogyo             Within the corporation F term (reference) 3D049 BB29 BB36 CC02 HH12                 3H071 AA03 CC26 CC28 DD46 DD89                 3J017 AA03 CA03 DA01 DA02 DB07                       DB08                 5H607 BB01 BB04 BB14 CC01 CC05                       DD16 FF06 GG01 GG08

Claims (3)

[Claims] 1. A motor housing having a bottomed cylindrical body, in which a first bearing is arranged on the inner bottom surface side, and a motor housing which is attached to an opening portion of the motor housing so as to cover the opening portion and is provided at the center. The bearing holder provided on the second
A bracket in which the bearing is arranged, a brush holder provided near the bracket in the motor housing, and one end side of the rotating shaft is housed in the motor housing in a state of protruding from the bearing holding portion of the bracket, In a pump operation motor having a motor housing and a rotor in which the rotary shaft is rotatably supported by the bearings held in a bracket, the bearing holding portion of the bracket is a motor housing from a central portion of the bracket. Of the outer cylindrical portion, and an inner cylindrical portion that is folded back at the outer end portion of the outer cylindrical portion and extends toward the motor housing while contacting the inner wall surface of the outer cylindrical portion and accommodates and holds the bearing inside. A motor for pump operation, comprising: a tubular portion. 2. A ring-shaped partition wall portion extending from the end of the inner cylinder portion on the motor housing side toward the center of the inner cylinder portion and formed so as to surround the periphery of the rotation shaft. The pump operating motor according to claim 1. 3. The pump operating motor according to claim 1, wherein the bearing holding portion holds the bearing by bending the outer end portion toward the center.