JP2002087244A - Motor mounting structure of brake unit - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent the generation of sound vibration during motor excitation by low-cost means. SOLUTION: A motor 2 for operating the pump is mounted on a surface of a unit housing 1 in which a pump for supplying a hydraulic pressure is housed by a bolt 3, and is in contact with the surface of the unit housing 1 at a position inside the bolt 3. In the motor mounting structure in which the front plate 24 is provided, a plurality of ribs 242 protrude from the front plate 24, and when the bolt 3 is fastened to the tip of the rib 242 in the protruding direction, the unit housing 1 A contact surface 243 is provided to contact the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic braking control or a vehicle behavior control having a plunger pump for generating a braking force when a driver is not performing a braking operation;
Executes active brake control such as boost control that assists the driver's braking operation, by-wire control that automatically generates a braking force in response to the driver's braking operation, or prevents wheel lock during braking The present invention relates to a mounting structure of a motor for operating a plunger pump in a brake unit capable of executing ABS control.

[0002]

2. Description of the Related Art Conventionally, as a motor mounting structure of a brake unit having a plunger pump as described above, for example, one described in Japanese Patent Application Laid-Open No. H11-139284 is known.

In this conventional publication, an eccentric cam for driving an opposing plunger pump provided in a unit housing is provided on a rotating shaft of a motor. A large-diameter flange portion is also provided, a hole that can be screwed to the unit housing is formed in the flange portion, and a front plate is mounted on the inner diameter of the flange portion. The shaft as well as the bearings supporting this rotating shaft are penetrated. Further, in the related art, the flange portion is formed with an inclined shape, so that the flange portion is coupled with an elastic force.

[0004]

However, in the above-described prior art, the front plate has a flat contact surface with the unit housing. For this reason, if both the planar processing accuracy of the front plate and the planar processing accuracy of the unit housing are not high, play occurs on the contact surface between the front plate and the unit housing, resulting in deterioration of sound vibration performance. That is, when the rotating shaft is vibrated, the motor vibrates,
Relative movement occurs between the front plate and the unit housing, and the two collide with each other or rub against each other to generate a sound, and vibration increases due to resonance. Moreover, in the above-described conventional technology, the support point for supporting the motor is a flange portion on the outer periphery and is separated from the shaft center, so that when the motor vibrates, a moment acts and the vibration is reduced. There was also a problem that it easily became large.

[0005] The present invention has been made in view of the above-mentioned conventional problems, and has as its object to prevent the occurrence of sound vibration at the time of motor excitation by low-cost means.

[0006]

According to the present invention, a motor for operating the pump is mounted on a surface of a unit housing accommodating a pump for supplying hydraulic pressure by fastening means. In a motor mounting structure in which a front plate abutting on a surface of a unit housing is provided inside a fastening means of the motor, a plurality of ribs are protruded from the front plate, and a tip portion of the rib in a protruding direction is provided. And a contact portion that comes into contact with the surface of the unit housing when the fastening means is fastened. According to a second aspect of the present invention, in the motor mounting structure for a brake unit according to the first aspect, the contact portion is provided with a contact surface that comes into contact with a surface of the unit housing. And According to a third aspect of the present invention, in the motor mounting structure for a brake unit according to the first or second aspect, the fastening means is fastened between the ribs so that the abutting portion is formed on the surface of the unit housing. An elastic member is provided, which elastically deforms in a state where the contact portion is in contact with the unit housing and applies an urging force in a direction in which the contact portion moves away from the unit housing. According to a fourth aspect of the present invention, in the motor mounting structure for a brake unit according to the third aspect, the elastic member is a spring piece formed by cutting and raising a front plate.

[0007]

According to the present invention, when the motor is mounted on the unit housing by the fastening means, the front plate provided inside the fastening means comes into contact with the surface of the unit housing. Instead of contacting the entire surface, the contact portions of a plurality of ribs contact. Therefore, as compared with the case where the entire surface is abutted, it is possible to prevent the one-sided contact and stably abut, and at the time of assembling, the positioning of the front plate, that is, the motor, with respect to the unit housing is facilitated. The accuracy of attachment can be improved. In addition, the front plate and the unit housing can be prevented from hitting each other, and noise can be prevented from being generated when a vibration direction is input to the rotating shaft of the motor. Can be prevented.

According to the second aspect of the present invention, the contact surface of the unit housing is provided as a contact portion of the rib as a contact portion of the rib, so that the contact between the rib and the unit housing is more stable, and the generation of noise is prevented. Can be achieved at a higher level.

According to the third aspect of the present invention, when the motor is mounted on the unit housing, the elastic member provided between the ribs is elastically deformed to urge the front plate away from the unit housing. . Therefore, even when the contact portion between the ribs and the unit housing are worn out or the fastening force of the fastening means is weakened, the front plate is not urged and does not hit the unit housing, so that generation of noise can be prevented. . According to the fourth aspect of the present invention, since the spring piece obtained by cutting and raising a part of the front plate is used as the elastic member for obtaining the above-described operation, the number of parts can be reduced, and an inexpensive and simple configuration is used. Generation of noise can be prevented at a high level.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a side view of the brake unit BU to which the embodiment of the present invention is applied. 1 in the figure
A unit housing, not shown, houses therein a pump having a pair of opposed plungers, an electromagnetic valve for controlling wheel cylinder pressure, and the like.

A motor 2 is mounted on a side surface of the unit housing 1. FIG. 1 is a cross-sectional view of the motor 2 and shows a rotor 21 around which a coil 211 is wound.
An eccentric cam 213 that causes a plunger (not shown) to stroke is provided at the tip of the rotary shaft 21 having the second shaft 2. The magnet 23 is attached to a position outside the rotor 212 on the motor case 22 forming the yoke 221.

A flange 222 is formed on the outer periphery of the yoke 221 of the motor case 22. As shown in FIG. 2, holes 223 through which bolts 3 (see FIG. 3) as fastening means are inserted are formed in the flange portion 222 at three places.

A front plate 24 is fitted and fixed to the inner periphery of the flange portion 222. A step 241 is formed at the center of the front plate 24, and a bearing 25 for supporting the rotary shaft 21 is fixed to the step 241, and the motor case 22 near the step 241 is provided in the motor case 22. , And a brush device 26 are housed therein.

As shown in FIGS. 1 and 2, the front plate 24 has ribs 242 projecting in the unit housing direction and extending in an arc shape about the rotary shaft 21 at three places. Is formed.
The upper surface of the rib 242 serves as a contact surface 243 that contacts the unit housing 1. Further, spring pieces 244 as elastic members are cut and raised toward the unit housing 1 at three places between the ribs 242 and the ribs 242.
The protrusion amount is slightly larger than the rib 242.

Therefore, in this embodiment, when the motor 2 is mounted on the unit housing 1, the bolt 3 inserted into the hole 223 is fastened and fixed to the unit housing 1. When the bolt 3 is fastened in this manner, the three spring pieces 2 protruding from the front plate 24
In a state where 44 is elastically deformed, the contact surfaces 243 of the three ribs 242 are brought into contact with the surface of the unit housing 1 and fixed.

In the mounting structure according to the above-described embodiment, the front plate 24 abuts and is fixed by the abutting surfaces 243 of the three ribs 242, so that the entire front plate can be finished in high quality. Even if it is not performed, troubles such as one-sided contact do not occur, and noise is hardly generated at the time of vibration. Further, the positioning of the mounting position of the front plate 24 is also ensured, and the assembling accuracy is improved. As described above, noise can be prevented from being generated with an inexpensive configuration, and assembling accuracy can be improved. Moreover, the rib 24
2 is provided at a position close to the rotary shaft 21, the input point of the fastening force is close to the rotary shaft 21, and the rotation of the rotary shaft 21 is less likely to occur than in the related art, thereby also preventing generation of noise. be able to. in addition,
A spring piece 244 is provided in parallel with the rib 242 so that a reaction force by the spring piece 244 acts upon fastening.
When the contact surface 243 of the rib 242 is worn or the bolt 3 is loosened, the deformation of the spring piece 244 is restored, and the front plate 24 is pushed, and
It is possible to prevent a gap from being formed between the unit 4 and the unit housing 1, and it is possible to prevent the two from colliding at the time of vibration and generating noise.

Although the embodiment has been described with reference to the drawings, the present invention is not limited to this embodiment. For example, in the embodiment, the example in which the rib 242 is provided with the arc-shaped contact surface 243 has been described, but the shapes of the rib and the contact surface are not limited to the shapes described in the embodiment. Further, the rib may be formed in such a shape as to come into point contact with the unit housing 1. Also,
In the embodiment, the front plate 24 is used as the elastic member.
Although the spring piece 244 in which a part of the spring plate 244 is cut out is shown, an elastic member such as rubber may be provided separately from the front plate 24.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (S2-S2 cross section in FIG. 2) of a motor to which an embodiment is applied.

FIG. 2 is a front view of a motor to which the embodiment is applied.

FIG. 3 is a side view showing a brake unit to which the embodiment is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit housing 2 Motor 3 Bolt 21 Rotation shaft 22 Motor case 23 Magnet 24 Front plate 25 Bearing 26 Brush device 211 Coil 212 Rotor 213 Eccentric cam 221 Yoke 222 Flange part 223 Hole 241 Step part 242 Rib 243 Contact surface 244 Spring piece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D049 BB21 HH00 HH12 HH53 MM01 NN01 5H605 AA04 AA05 BB05 CC01 CC02 CC04 CC05 CC07 DD03 DD09 EA11 EA21 EB10 FF08 GG05 GG06 5H607 AA04 BB01 BB14 CC01 DD03 DD05 DD03 DD FF06 GG01 GG08 JJ05 JJ08 KK08

Claims (4)

[Claims] 1. A motor for operating the pump is mounted on a surface of a unit housing in which a pump for supplying hydraulic pressure is housed by fastening means, and abuts on a surface of the unit housing inside the fastening means of the motor. In a motor mounting structure provided with a front plate, a plurality of ribs are protruded from the front plate, and the front end of the rib in a protruding direction is brought into contact with the surface of the unit housing when the fastening means is fastened. A motor mounting structure for a brake unit, wherein a contact portion is provided to be in contact with the motor. 2. The motor mounting structure for a brake unit according to claim 1, wherein the contact portion is provided with a contact surface that comes into contact with a surface of the unit housing. 3. A rib is elastically deformed in a state where the abutting portion is brought into contact with the surface of the unit housing by fastening the fastening means between the ribs so that the abutting portion is separated from the unit housing. The motor mounting structure for a brake unit according to claim 1 or 2, further comprising an elastic member that applies a force. 4. The motor mounting structure for a brake unit according to claim 3, wherein the elastic member is a spring piece formed by cutting and raising a front plate.