JP3982751B2 - Washer pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a washer pump that is mounted on an automobile and feeds a washer liquid in a washer tank to a front window or the like.
[0002]
[Prior art]
For example, a washer pump described in Japanese Patent Application Laid-Open No. 2001-234895 is configured by integrating a pump unit and a motor unit, and a yoke that forms an outer shell of the motor unit is housed inside a resin case that forms an exterior body. A pair of semi-cylindrical magnets are arranged opposite to each other on the inner circumference of the yoke, an armature is arranged on the inner circumference of the magnet, and an impeller is coupled to the outer protruding portion of the armature shaft arranged at the center of the armature. The impeller is rotated in a pump chamber defined by a resin case and a pump cover so as to exert a pump action.
[0003]
In this type of washer pump, when fixing the pair of magnets constituting the motor unit at a predetermined position in the circumferential direction on the inner circumference of the yoke, the fixed distance between the circumferential ends of the pair of magnets is fixed. Yes. There are two positions at a predetermined interval. Conventionally, for example, one place receives the end of the magnet with an engagement piece cut and raised on the inner circumference of the yoke, and the other place is between the circumferential ends of the magnet. By sandwiching the spring type retainer, the magnet is fixed in the circumferential direction by the repulsive force of the retainer.
[0004]
[Problems to be solved by the invention]
By the way, in the past, to fix one end of the magnet, an engagement piece is formed by cutting and raising on the peripheral wall of the yoke, so there is a hole in a part of the yoke, which causes the magnetic path There was a risk of adverse effects on formation.
[0005]
In view of the above circumstances, an object of the present invention is to provide a washer pump capable of reliably positioning and fixing a magnet without making a hole in the yoke.
[0006]
[Means for Solving the Problems]
The invention of claim 1 is a cylindrical resin case having a bottom wall, a pump cover that defines a pump chamber by being coupled to the bottom of the resin case, a motor cover that is coupled to the top of the resin case, A cylindrical yoke fitted to the inner periphery of the resin case, a pair of substantially semi-cylindrical magnets arranged opposite to each other on the inner periphery of the yoke, and the pair of magnets fixed at a fixed position in the circumferential direction Positioning means, an armature disposed inside the magnet and rotated by energization, an armature shaft disposed at the center of the armature and supported at both ends on the motor cover and the bottom wall of the resin case by bearings via bearings, respectively, An impeller coupled to the projecting end of the armature shaft into the pump chamber and rotating in the pump chamber by the rotation of the armature shaft to exert a pump action In the washer pump, as a positioning means for fixing the pair of magnets in a fixed position in the circumferential direction, when a yoke is fitted into the resin case on the bottom wall of the resin case, one circumferential direction of the pair of magnets A stopper piece that protrudes into the space between the end portions and restricts the positions of both magnets in the circumferential direction is projected, and inserted into the space between the other circumferential end portions of the pair of magnets later. A U-shaped spring that presses the magnet toward the stopper piece and fixes the magnet is provided, and a plurality of protrusions that serve as seats for the U-shaped spring are formed on the inner peripheral surface of the yoke by punching from the outer periphery. It is characterized by that.
[0007]
When the above-described pair of magnets is fixed at a predetermined position in the circumferential direction on the inner circumference of the yoke, it is necessary to position and fix the gap with a predetermined interval (vacant space) between the circumferential ends of the pair of magnets. In the present invention, when the resin case and the yoke are combined, the stopper piece protruding from the bottom wall of the resin case is made to enter the space. Thus, the positioning is performed by the stopper piece. On the other side, U-shaped springs are inserted between the circumferential ends of the magnets, and both magnets are pressed against the stopper pieces by the opening force of the U-shaped springs. The magnet is fixed at a fixed position in the circumferential direction. In this case, since the stopper piece protrudes from the resin case, it is not necessary to provide the cut-and-raised engagement piece for positioning on the yoke. Therefore, it is not necessary to form a hole in the peripheral wall of the yoke in order to provide the cut-and-raised engagement piece, and there is no possibility of adversely affecting the magnetic path formation. In the present invention, since the cylindrical yoke is fitted to the inner periphery of the cylindrical resin case, the yoke can be brought into close contact with the resin case, and the rigidity can be maintained high. Furthermore, since a plurality of protrusions serving as seats for the U-shaped spring are provided on the inner peripheral surface of the yoke, the U-shaped spring can be held in a stable position, and the urging force of the U-shaped spring can be applied to the end surface of the magnet. An appropriate position can be applied. Accordingly, the magnet can be fixed with a stable force, and improper assembly can be prevented. The plurality of protrusions on the inner peripheral surface of the yoke formed by punching process do not receive the circumferential end of the magnet, but only receive the U-shaped spring, and do not need to protrude greatly. There is no need to worry about holes in the yoke.
[0008]
According to a second aspect of the present invention, in the first aspect, the stopper piece is formed integrally with the resin case .
[0009]
In the present invention, since the stopper piece is formed integrally with the resin case, the number of parts does not increase.
[0010]
A third aspect of the present invention is the axial stopper according to the first or second aspect, wherein the yoke and the resin case are positioned in the axial direction of the magnet by sandwiching the magnet from both sides in the axial direction when the yoke is inserted into the resin case. Are provided.
[0011]
In the present invention, the magnet can be reliably positioned and fixed at a predetermined position in the axial direction of the yoke only by inserting a yoke in which the magnet is previously incorporated into the resin case.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is an exploded perspective view of the main part of the motor part of the washer pump of the embodiment, FIG. 2 is a cross-sectional view of the main part in an assembled state corresponding to the cross section taken along the arrow II-II in FIG. 1, and FIG. 4 is a partial cross-sectional view of the assembled state corresponding to the cross section taken along the arrow, FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2, and FIG.
[0013]
As shown in FIGS. 1 and 2, the washer pump includes a cylindrical resin case 10 having a bottom wall 11 and a pump cover 20 that defines a pump chamber 21 by being coupled to the bottom of the resin case 10. (Only shown in FIG. 2), a motor cover (not shown) coupled to the upper portion of the resin case 10, a cylindrically wound yoke 30 fitted to the inner periphery of the resin case 10, and the inner periphery of the yoke 30 A pair of substantially semi-cylindrical magnets 41, 42 disposed opposite to each other, positioning means (described later) for fixing the pair of magnets 41, 42 at fixed positions in the circumferential direction, An armature 50 (indicated only in FIG. 2) that is arranged on the inside and rotates when energized, and a motor cover (not shown) and both ends of the armature 50 that are arranged in the center of the armature 50 and the bottom wall 11 of the resin case, respectively. The armature shaft 51 rotatably supported through the receiver 12 is coupled to the projecting end 51 a of the armature shaft 51 into the pump chamber 21, and is rotated inside the pump chamber 21 by the rotation of the armature shaft 51. An impeller 60 (only shown in FIG. 2) that exhibits a pump action is provided. The magnets 41 and 42 are arranged symmetrically on the inner periphery of the yoke 30, thereby generating a magnetic force opposite to the inner periphery.
[0014]
Here, as a positioning means for fixing the pair of magnets 41 and 42 at fixed positions in the circumferential direction, as shown in FIG. 4, the magnets 41 and 42 are inserted into the first space 43 between the circumferential ends of the magnets 41 and 42. A stopper piece 16 and a U-shaped spring 70 to be inserted into the second space 44 are provided. The stopper piece 16 is formed integrally with the resin case 10 as will be described below, and the U-shaped spring 70 is inserted into the space 44 later, and a metal pin bent into a U-shape. It is.
[0015]
On the bottom wall 11 of the resin case 10, first and second arcuate walls 13 and 14 on which the lower end surfaces of the magnets 41 and 42 are placed project upward. The first and second arc walls 13 and 14 do not correspond to the magnets 41 and 42, but are positioned so that both ends of one magnet 41 and 42 straddle the upper ends of the two arc walls 13 and 14. The upper end surfaces near both ends in the width direction (circumferential direction) of the circular arc walls 13 and 14 are magnet mounting surfaces 15. Accordingly, the first and second cavities 43 and 44 secured between the circumferential ends of the magnets 41 and 42 are located on the center portions in the width direction of the arc walls 13 and 14.
[0016]
Then, as shown in FIG. 2, when the yoke 30 is fitted in the resin case 10 at the center in the width direction of the first arc wall 13, the first arc space 13 enters the first space 43 between the magnets 41 and 42. The stopper piece 16 is provided so as to project the position of the magnets 41 and 42 in the circumferential direction. Further, as shown in FIG. 3, a notch groove into which the head of the U-shaped spring 70 inserted into the second space 44 between the magnets 41 and 42 is inserted in the center portion in the width direction of the second arc wall 14. 17 is provided. The notch groove 17 is provided to position the U-shaped spring 70 in the insertion direction by applying a curved head 70 a to the bottom surface of the notch groove 17 when the U-shaped spring 70 is inserted into the space 44. Yes. The U-shaped spring 70 is inserted into the second space 44 between the magnets 41 and 42 later so that the magnets 41 and 42 are pressed toward the stopper piece 16 by the opening force. It plays the role of positioning and fixing 42 in the circumferential direction. The circumferential end surfaces of the magnets 41 and 42 are chamfered at an angle at which the pressing force from the stopper piece 16 and the U-shaped spring 70 can be effectively received as a force for fixing the magnets 41 and 42 in the circumferential direction.
[0017]
As shown in FIGS. 3, 4, and 5, four protrusions 31 that serve as seats for the U-shaped spring 70 are formed on the inner peripheral surface of the yoke 30 by stamping from the outer periphery of the yoke 30. ing. As shown in FIG. 5, these protrusions 31 hold the U-shaped spring 70 at a certain height so that the action point of the opening force of the U-shaped spring 70 (the straight portion 70 b of the U-shaped spring 70) is magnet 41, It is intended to effectively abut the end face of 42 and does not directly position and fix the magnets 41, 42. Therefore, it is only formed as a small protrusion, and is not specifically formed with a hole. .
[0018]
The magnet mounting surface 15 of the arc walls 13 and 14 described above is one of axial stoppers that perform axial positioning with the magnets 41 and 42 sandwiched from both sides in the axial direction when the yoke 30 is inserted into the resin case 10. The other means is constituted by a locking piece 32 cut and raised on the inner peripheral side of the yoke 30. That is, by inserting the yoke 30 into which the magnets 41 and 42 are inserted in advance into the resin case 10, the magnets 41 and 42 are connected to the magnet mounting surface 15 of the arcuate walls 13 and 14 and the locking piece 32 of the yoke 30. Is positioned at a predetermined position.
[0019]
Next, the assembly procedure will be described.
To assemble the motor part of this washer pump, first, magnets 41 and 42 are inserted into the inner periphery of the yoke 30. At this time, the positions of the voids 43 and 44 between the magnets 41 and 42 are roughly set out. Next, the yoke 30 is inserted into the resin case 10 and the stopper piece 16 on the resin case 10 side is caused to enter the first space 43 between the magnets 41 and 42. Here, since the yoke 30 and the resin case 10 are both cylindrical, the yoke 30 is in close contact with the inner periphery of the resin case 10.
[0020]
Next, the U-shaped spring 70 is inserted into the second space 44 between the magnets 41 and 42 from the head 70a, and the U-shaped spring 70 is positioned on the protrusion 31 which is a seat. In this way, the opening force of the U-shaped spring 70 can be effectively applied to the end surfaces of the magnets 41 and 42, and the magnets 41 and 42 are sandwiched between the U-shaped spring 70 and the stopper piece 16, 41 and 42 can be positioned and fixed in the circumferential direction. Further, the magnets 41 and 42 can be positioned and fixed in the axial direction by the magnet mounting surface 15 on the resin case 10 side and the locking piece 32 on the yoke 30 side.
[0021]
Thereafter, the armature 50 is inserted into the inner peripheral portions of the magnets 41 and 42, a motor cover (not shown) is attached to the upper end of the resin case 10, and the armature shaft 51 is rotatably supported, and the resin of the armature shaft 51 is also supported. Install the Lee Npera 60 to the protruding end 51 a of the casing 10 outside, by attaching the pump cover 20, the washer pump is completed.
[0022]
As described above, in this washer pump, the magnets 41 and 42 are positioned and fixed in the circumferential direction by the stopper piece 16 protruding from the resin case 10 side and the U-shaped spring 70. There is no need to provide a cut and raised engagement piece. Therefore, it is not necessary to form a hole in the peripheral wall of the yoke 30 in order to provide the cut-and-raised engagement piece, and there is no possibility of adversely affecting the magnetic path formation. Further, since the cylindrical yoke 30 is fitted to the inner periphery of the cylindrical resin case 10, the yoke 30 can be brought into close contact with the resin case 10 and there is an advantage that rigidity is increased.
[0023]
Further, since a plurality of protrusions 31 that serve as seats for the U-shaped spring 70 are provided on the inner peripheral surface of the yoke 30, the U-shaped spring 70 can be held in a stable position. The urging force can be effectively applied to appropriate positions on the end surfaces of the magnets 41 and 42. Therefore, the magnets 41 and 42 can be fixed with a stable force, and an inappropriate assembly of the U-shaped spring 70 can be prevented. Here, the protrusion 31 on the inner peripheral surface of the yoke 30 formed by the punching process does not directly receive the circumferential end portions of the magnets 41 and 42 but only receives the U-shaped spring 70 and protrudes greatly. Since it is not necessary, there is no worry that the yoke 30 has a hole. Therefore, there is no adverse effect on the magnetic path formation by providing the protrusion 31. Further, since the stopper piece 16 is formed integrally with the resin case 10, the number of parts does not increase.
[0024]
【The invention's effect】
As described above, according to the first to third aspects of the invention, the magnet can be fixed at a fixed position in the circumferential direction without making a hole in the yoke. Therefore, the magnetic path formation is not adversely affected. In addition, as in the first aspect of the present invention, by providing a plurality of U-shaped spring seats, the U-shaped spring and the magnet can be stably assembled. Moreover, since the stopper piece is integrally formed with the resin case as in the invention of claim 2, the number of parts does not increase. Furthermore, as in the invention of claim 3, by providing an axial stopper on the yoke and the resin case, the magnet can be reliably positioned and fixed at a predetermined axial position of the yoke simply by inserting the yoke into the resin case. This makes it easy to assemble.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of a motor portion of a washer pump according to an embodiment of the present invention.
2 is a cross-sectional view of an essential part in an assembled state corresponding to a cross-section taken along the line II-II in FIG. 1;
3 is a partial cross-sectional view of the assembled state corresponding to the cross-section taken along the line III-III in FIG. 1;
4 is a cross-sectional view taken along the line IV-IV in FIG. 2;
FIG. 5 is an enlarged view of a portion V in FIG. 4;
[Explanation of symbols]
10 Resin case 11 Bottom wall 15 Magnet mounting surface (axial stopper)
16 Stopper piece 20 Pump cover 21 Pump chamber 30 Yoke 31 Protrusion (receiving seat)
32 Locking piece (Axial stopper)
41 magnet 43 cavity 50 the armature 51 the armature shaft 51a protruding end 60 b Npera <br/> 70 U-shaped spring

Claims (3)

A cylindrical resin case having a bottom wall; a pump cover that defines a pump chamber by being coupled to the bottom of the resin case; a motor cover that is coupled to an upper portion of the resin case; A cylindrical yoke fitted to the circumference, a pair of substantially semi-cylindrical magnets arranged opposite to each other on the inner circumference of the yoke, and positioning means for fixing the pair of magnets at fixed positions in the circumferential direction And an armature that is arranged inside these magnets and rotates when energized, and an armature shaft that is arranged at the center of the armature and that is rotatably supported by bearings on the bottom wall of the motor cover and the resin case via bearings, respectively. This armature shaft is coupled to the projecting end of the pump chamber and pumped by being rotated in the pump chamber by the rotation of the armature shaft. A washer pump and a that the impeller,
As a positioning means for fixing the pair of magnets at a fixed position in the circumferential direction, a space between one circumferential end of the pair of magnets when the yoke is fitted into the resin case on the bottom wall of the resin case A stopper piece that restricts the position of both magnets in the circumferential direction is provided by projecting into the space, and is inserted into the space between the other circumferential end portions of the pair of magnets toward the stopper piece. Provide a U-shaped spring to press the magnet and fix the magnet,
A washer pump , wherein a plurality of protrusions serving as seats for the U-shaped spring are formed on the inner peripheral surface of the yoke by punching from the outer periphery . The washer pump according to claim 1, wherein the stopper piece is formed integrally with the resin case .   2. An axial stopper for positioning the magnet in the axial direction by sandwiching the magnet from both sides in the axial direction when the yoke is inserted into the resin case, respectively, on the yoke and the resin case. 2. The washer pump according to 2.

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