JP3752188B2 - motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor for operating a pump of, for example, an antilock brake device for a vehicle.
[0002]
[Prior art]
An example of an antilock brake device for a vehicle will be described. In a hydraulic circuit formed between a brake master cylinder provided to be connected to a brake pedal for a vehicle and a wheel cylinder provided to be connected to a wheel brake. The brake fluid can be circulated. The hydraulic circuit is provided with a reservoir for temporarily storing brake fluid. In order to return the brake fluid stored in the reservoir to the brake master cylinder side, a pump is provided in the hydraulic circuit connected to the reservoir. This pump is operated by a motor to return the brake fluid to the master cylinder side.
[0003]
The present applicant has proposed a pump operation motor disclosed in Japanese Patent Application Laid-Open No. 2000-278925 as an example of a pump operation motor of a vehicle antilock brake device. This pump operating motor relates to a motor that improves the assembly of magnets constituting the stator side yoke and the positioning of the magnet and the brush. The magnet has one end abutting on both sides of a ridge formed by inflating the wall surface of the yoke formed in a cup shape, and an elastic member such as a clip is mounted between the opposite ends. It is assembled. By removing these clips and the like, the magnets can be collected separately, and the motor can be designed with ecology in mind.
[0004]
[Problems to be solved by the invention]
However, since the magnet is fixed to the yoke by the elastic force of an elastic member such as a clip, when a vibration or impact is applied to the pump operating motor during traveling or the like, the elastic member such as a clip moves in the circumferential direction of the yoke. However, there is a possibility that the positional deviation or dropout in the radial direction may occur.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor that solves the above-described problems of the prior art, improves magnet assembly and recovery, and prevents the magnet from being displaced or dropped from the yoke.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
That is, in a motor including a stator having a plurality of magnets assembled along the inner wall of the yoke and a rotor housed in the yoke of the stator, the stator has the yoke peripheral wall inward. One or a plurality of stoppers, which are bulged and formed in the axial direction, are arranged along the inner wall surface of the yoke with one end surfaces of the plurality of magnets abutting from both sides and formed on the other end surface of the magnet. An elastic member elastically mounted in a gap surrounded by a tapered surface and an inner wall surface of the yoke, which is inclined in a direction in which the interval increases toward the radially outer side, is assembled using the tapered surface and the inner wall surface of the yoke as a guide surface. The corner portion of the circumferential end surface adjacent to the surface is chamfered .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the embodiment of the present invention, a pump operating motor used in a vehicle antilock brake device will be described as an example of a motor.
FIG. 1 is a partially broken explanatory view showing a fixed state of a magnet with respect to a yoke, FIGS. 2 (a), (b) and (c) are plan views of the magnet, a partial side view seen from an arrow A direction, and an enlarged plan view of a B portion. 3 (a) and 3 (b) are a front view and a side view of the magnet, FIGS. 4 (a) and 4 (b) are a front view and a side view of a clip mounted between the magnets, and FIG. FIG. 6 is a side view of the pump operating motor as viewed from the housing side.
[0008]
Next, a schematic configuration of the pump operating motor will be described with reference to FIG.
The pump operating motor 1 is an inner rotor type motor, and includes a stator 4 having a plurality of magnets 3 assembled along the inner wall of the yoke 2, and a rotor 5 accommodated in the yoke 2 of the stator 4. It has.
The pump operating motor 1 has a main body side end 7 which is one end of a rotary shaft 6 inserted into a block body (not shown), and a terminal 8 for supplying power to the pump operating motor 1 is connected to a connection terminal of an electronic control unit (not shown). Insert and fix.
[0009]
Next, the structure of the stator 4 of the pump operating motor 1 will be described. The yoke 2 is formed in a cup shape and forms the exterior of the motor. As the material of the yoke 2, for example, a metal material such as a deep drawing steel plate (SPCE) is preferably used.
On the inner wall surface of the yoke 2, a plurality of (two in this embodiment) magnets 3 having a circular arc section made of a magnetic material such as ferrite are assembled, and magnetized to a required number of magnetic poles (four poles in this embodiment). Has been.
[0010]
In FIG. 5, the bottom 2 a of the yoke 2 is formed without bulging outward, and a bearing housing portion 9 that protrudes toward the rotor 5 is formed. The bearing housing portion 9 is formed by bending the yoke bottom portion in the axial direction opposite to the axial direction by press molding. Not only the bending process but also a protruding wall that protrudes toward the rotor 5 may be formed on the bottom 2a of the yoke 2. A rolling bearing 10 is fitted in the bearing housing portion 9, and a rotor side end portion 11 that is the other end of the rotating shaft 6 is rotatably supported by the rolling bearing 10. The rolling bearing 10 is firmly held by the elasticity of the bent portion by fitting into the bearing housing portion 9 by bending. The bearing housing 9 is not limited to the rolling bearing 10 but may be a sliding bearing or the like.
[0011]
A brush holder 12 is provided in the opening of the yoke 2. The brush holder 12 holds a brush 14 that can supply power to a commutator 13 through a terminal 8 from a block body (not shown) that is a main body of the apparatus. The brush holder 12 is fitted into a gap formed on the opening-side inner wall of the yoke 2. The brush 14 is always urged so as to be in sliding contact with the commutator (commutator) 13 by a spring 15 which is elastically mounted between the brush holder inner wall.
Reference numeral 16 denotes a housing which is fitted over the opening of the yoke 2 from the outside of the brush holder 12 and is interposed between the yoke 2 and a block body (not shown). As shown in FIG. 6, the terminal 8 protrudes toward the block body through a through hole 16 a formed in the housing 16.
[0012]
Next, the configuration of the rotor 5 of the pump operating motor 1 will be described. In FIG. 5, reference numeral 17 denotes a core that is integrally fitted to the rotor side end 11 that is the other end of the rotating shaft 6. The periphery of the core 17 is covered with an insulator 18 made of an insulating material, and an armature winding (magnet wire) 19 is wound around a slot formed in the core 17.
[0013]
The commutator 13 is fitted into the rotor side end 11 of the rotating shaft 6 and energizes the armature winding 19 so as to urge the rotor 5 in the rotation direction. A brush 14 is pressed against the commutator 13 so that power is supplied from the block body side (not shown) through the terminal 8.
[0014]
A support ball bearing 20 is press-fitted into the main body side end 7 of the rotary shaft 6. The supporting ball bearing 20 is fitted so as to be accommodated between the brush holder 12 and the housing 16. The support ball bearing 20 is adapted to receive a radial load applied to the rotary shaft 6 by press-fitting and supporting the housing 16 covering the outer periphery to the block body (not shown). Further, an eccentric shaft portion 21 is formed in the vicinity of the main body side end portion 7 of the rotating shaft 6, and an operation ball bearing 22 is press-fitted into the eccentric shaft portion 21. The actuating ball bearing 22 is configured to reciprocate a piston of a plunger pump (not shown) linked to a spring.
[0015]
Next, the structure for fixing the magnet 3 to the yoke 2 will be described in detail with reference to FIGS. In FIG. 1, the cup-shaped yoke 2 is formed with protrusions 23 in the axial direction as stoppers by inflating the yoke peripheral wall inward. One end surface 3a of the plurality of magnets 3 is brought into contact with the protrusion 23 from both sides, and is disposed along the yoke inner wall surface 26. Between the other end surfaces 3b of the magnet 3, a U-shaped clip 24 is elastically moved as an elastic member. It is assembled by wearing.
[0016]
2A to 2C, each magnet 3 has its one end surface 3a abutting against the ridge 23 from both sides to restrict the movement in the circumferential direction. A tapered surface 25 is formed on the other end surface 3b of each magnet 3 which has an inclination in a direction in which the interval increases radially outward. That is, a C-shaped tapered surface 25 opened toward the outer diameter side in plan view is formed on the other end surface 3b of the opposing magnet 3 (see FIG. 1). 3A and 3B, the corner portions 3c and 3d of the circumferential end surface and the axial end surface of the magnet 3 are chamfered so that the yoke inner wall surface 26 is not damaged.
[0017]
In FIG. 1, each magnet 3 is assembled by mounting a clip 24 in a gap 27 surrounded by a tapered surface 25 and a yoke inner wall surface 26 formed on the opposite other end surface 3b. That is, the clip 24 abuts against the taper surface 25 and the yoke inner wall surface 26 and is repelled, whereby the one end surface 3 a of the magnet 3 is pressed against both sides of the ridge 23 in the circumferential direction, and further, in the radial direction of the magnet 3. The holding power is improved by preventing the displacement and dropout.
[0018]
The clip 24 is made of an elastic steel material formed in a U shape. The clip 24 will be described in detail with reference to FIGS. 4 (a) and 4 (b). The clip 24 includes a pressing portion 24 a that stands up on both sides so as to be elastically tiltable, and a connecting portion 24 b that connects the pressing portions 24 a and is mounted along the bottom portion 2 a of the yoke 2. The upper end side of the both side pressing portions 24a is formed to be bent slightly narrow so that the taper surface 25 of the magnet 3 and the yoke inner wall surface 26 are not damaged. Note that the elastic member is not limited to the clip 24 made of steel, and various materials and forms can be applied as long as the member is elastic and can be positioned.
[0019]
When the magnets 3 are fixed using the clips 24, in FIG. 1, each magnet 3 is inserted along the inner wall of the yoke 2, and the one end surface 3 a is brought into contact with both end surfaces 23 a of the protrusion 23. In this state, when the magnet 3 is mounted between the other end surfaces 3b, while pressing the connecting portion 24b, the both side pressing portions 24a are guided by the tapered surface 25 and the yoke inner wall surface 26, and the distance between the both side pressing portions 24a is increased. Insert while tilting to narrow. At this time, the both-side pressing portion 24a can be pushed in without radial displacement using the tapered surface 25 and the yoke inner wall surface 26 as a guide surface, so that the assembling property is improved. The circumferential urging of each magnet 3 is strengthened, the one end surface 3a is pressed against both side surfaces 23a of the ridge 23, the circumferential movement is restricted, and there is no occurrence of displacement or dropping in the radial direction. Fits mechanically.
[0020]
Therefore, the plurality of magnets 3 are arranged such that the one end surface 3a is pressed against the protrusion 23 by the clip 24 that is elastically contacted with the tapered surface 25 and the yoke inner wall surface 26 formed on the other end surface 3b facing each other. 2, even when vibration is applied to the pump operating motor 1, the fixing force of the magnet 3 to the yoke 2 is improved, thereby preventing radial displacement and dropping. Since the plurality of magnets 3 can be fixed to the yoke 2 by the elastic force of the clips 24, the magnets 3 can be easily attached and detached by releasing the urging force by the clips 24, and can be collected separately. Further, the clip 24 can push the connecting portion 24b while the both-side pressing portion 24a is guided by the tapered surface 25 and the yoke inner wall surface 26, so that the assembling property is improved.
[0021]
In the above embodiment, the description has been made using the quadrupole magnetized magnet 16 in which the protrusion 23 is formed in one place on the yoke 2 and the two magnets 3 are provided. However, the present invention is not limited to this embodiment. For example, two or three protrusions 23 may be provided as stoppers, and the number of magnets 3 may be four or six, and a larger number (even number). Further, the protrusions 23 may be formed on the yoke 2 at a plurality of locations, and the plurality of magnets 3 may be fixed using an elastic member such as the clip 24 without being limited to the divided form.
In addition, although the present embodiment has exemplified the pump operating motor of the vehicle anti-lock brake device, the present invention is not limited to this, and the spirit of the law can be applied to motors used in other devices. Of course, various modifications can be made without departing from the scope.
[0022]
【The invention's effect】
According to the configuration described in claim 1 of the present invention, the plurality of magnets are formed on the taper surface and the yoke inner wall surface, which are inclined in the direction in which the interval is widened toward the radially outer side formed on the other end surfaces facing each other. Since the elastic member is elastically mounted in the enclosed gap, even when vibration is applied to the motor, the fixing force of the magnet to the yoke is improved, and it is possible to prevent positional deviation and dropout. Further, since the elastic member can be mounted while being guided by the tapered surface and the inner wall surface of the yoke, the assembling property is improved. Moreover, since each magnet can be easily attached or detached by releasing the urging | biasing of an elastic member, it can collect separately.
[Brief description of the drawings]
FIG. 1 is a partially broken explanatory view showing a fixed state of a magnet to a yoke.
FIG. 2 is a plan view of a magnet, a partial side view seen from the direction of arrow A, and an enlarged plan view of a B portion.
FIG. 3 is a front view and a side view of a magnet.
FIG. 4 is a front view and a side view of a clip mounted between magnets.
FIG. 5 is a cross-sectional view showing an overall configuration of a pump operating motor.
FIG. 6 is a side view of the pump operating motor as viewed from the housing side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump operation motor 2 Yoke 2a Bottom part 3 Magnet 4 Stator 5 Rotor 6 Rotating shaft 7 Main body side edge part 8 Terminal 9 Bearing accommodating part 10 Rolling bearing 11 Rotor side edge part 12 Brush holder 13 Commutator 14 Brush 15 Spring 16 Housing 16a Through-hole 17 Core 18 Insulator 19 Armature winding 20 Supporting ball bearing 21 Eccentric shaft portion 22 Acting ball bearing 23 Projection 24 Clip 24a Pressing portion 24b Connecting portion 25 Tapered surface 26 Yoke inner wall surface 27 Gap

Claims (1)

In a motor comprising a stator having a plurality of magnets assembled along the inner wall of the yoke, and a rotor housed in the yoke of the stator,
The stator is arranged along the yoke inner wall surface with one or more stoppers formed in the axial direction by inflating the yoke peripheral wall inward, with one end surfaces of the magnets coming into contact from both sides. An elastic member elastically mounted in a gap surrounded by a tapered surface and an inner wall surface of the yoke, each of which is formed on each of the other end surfaces of the magnet and has an inclination in a direction in which the interval is widened toward the radially outer side. A motor comprising a yoke inner wall surface as a guide surface and a corner portion of a circumferential end surface adjacent to the tapered surface being chamfered .

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