JPH0511755U - Retainer for motor magnet - Google Patents

Abstract

(57) [Summary] [Purpose] By making the shape simpler than that of the conventional one, the assembly to the motor yoke is extremely easy and the productivity is improved. By inserting the insertion guides 1f and 1g into the retainer mounting portion 60a1 along the cylinder direction of the motor yoke 60 first, the motor yoke contact portion 1a contacts the motor yoke 60 and the side wall support portions 1d, 1e and the side wall abutment protrusions 1h and 1i are side walls 6 of the motor magnets 61 and 62.
The bent portions 1b are pressed against and supported by the elastic portions 1a and 62a by the elastic force, and the end wall support projections 1c contact and support the end walls 61b and 62b of the motor magnets 61 and 62.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a retainer for a motor magnet used for holding a motor magnet mounted on the inner peripheral side of a motor yoke for accommodating an armature in a motor motor, for example, in a small motor for an automobile.

[0002]

[Prior Art]

 7 to 10 exemplify a retainer for a motor magnet used to hold the motor magnet on the motor yoke.

As shown in FIGS. 7 and 8, half-ring shaped motor magnets 31 and 32 are arranged at positions facing each other on the inner peripheral side of a substantially cylindrical shaped motor yoke 30. Motor magnets 50, 51 are assembled between the motor magnets 31, 32.

Since the illustrated motor magnet retainers 50 and 51 have the same shape, only the motor magnet retainer 50 on one side will be described here.

The motor magnet retainer 50 is made of elastic steel, and has a positioning hole 50a1 formed substantially in the center of a horizontally long rectangular plate-shaped base 50a in FIG. The left end and the right end of the base 50a in FIG. 9 are slightly inclined toward the upper side in the drawing.

In addition, as shown in FIG. 10, a curved shape is formed near the center of the base 50a from three positions separated from each other on the upper edge side and the lower edge side of the base 50a toward the upper side in FIG. The curved pieces 50b, 50c, 50d and the curved pieces 50e, 50f, 50g are provided respectively, and the small projection-like stopper 50b1 is provided on the tip side of each of the curved pieces 50b, 50c, 50d and 50e, 50f, 50g. , 50c1, 50d1 and 50e1, 50f1, 50g1 are provided, and each of the bending pieces 50b, 50c, 50d and 50e, 50f, 50g has an elastic force in the direction in which the curved portion expands and in the direction in which the curved portion narrows. Have.

On both sides of each of the curved pieces 50b, 50c, 50d and 50e, 50f, 50g of the base 50a, the base 50a is directed from the right end side and the left end side in FIG. 10 to the front side in FIG. Support pieces 50h and 50i protruding in an inverted V shape are provided respectively, and the support pieces 50h and 50i are formed on both ends of the base 50a in the direction in which the inverted C-shaped holding angle is widened with respect to the base 50a. And elastically deforms in the direction of narrowing the included angle.

Here, in the motor yoke 30, the retainers along the cylinder direction of the motor yoke 30 are provided between the side walls 31 a and 32 a and the side walls 31 b and 32 b of the motor magnets 31 and 32 along the cylinder direction of the motor yoke 30. Mounting portions 30a and 30b are formed, and convex portions 30c and 30d for fitting into the positioning holes 50a1 are provided at substantially the center of the retainer mounting portions 30a and 30b.

Therefore, the supporting piece 50h on the one side, which is the insertion tip side into the retainer mounting portion 30a on the one side, is elastically deformed in the direction in which the sandwiching angle is narrowed, and the bending pieces 50b, 50c, 50d and 50e, The motor magnet retainer 50 is held between the side walls 31a and 32a of the motor magnets 31 and 32 from the left side in FIG. 7 in a state in which 50f and 50g are pressed by a jig (not shown) in the direction in which the curved portions are narrowed. insert.

Then, when the support piece 50h on one side passes through the end walls 31c, 32c on the one side which is the right side in FIG. 7 of the motor magnets 31, 32, the positioning hole 50a1 is formed in the retainer mounting portion 30a. By inserting the convex portion 30c and removing the jig from the supporting piece 50h on one side and the curved pieces 50b, 50c, 50d and 50e, 50f, 50g on one side, the supporting piece 50h on one side is attached to the motor magnets 31, 32. Of the curved pieces 50b, 50c, 50d and the stoppers 50b1, 50c1, 50d1 are brought into contact with the side wall 31a of the motor magnet 31 on one side so that the curved pieces 50b, 50c, 50d are brought into contact with the curved pieces. 50e, 50f, 50g and the stoppers 50e1, 50f1, 50g1 are brought into contact with the side wall 32a of the motor magnet 32 on the other side. Let

As a result, the support piece 50h on the other side is positioned in the central portion of the end walls 31d, 32d on the other side of the motor magnets 31, 32 while the support piece 50i on the other side is positioned on the other side end wall 31d. , 32d on the opposite side to the motor magnets 31, 32 located at the center of one end wall 31c, 32c on one side, and by the elastic repulsive force of the curved pieces 50b, 50c, 50d and 50e, 50f, 50g. The side walls 31a and 32a of the motors 31 and 32 are pressed in the circumferential direction of the motor yoke 30 and assembled in the same manner to the retainer mounting portion 30b on the side opposite to the retainer mounting portion 30a. The magnet retainer 51 and the motor magnets 31 and 32 are held on the inner circumference of the motor yoke 30.

The armature 70 is housed inside the motor yoke 30, and the left end side of the motor yoke 30 in FIG. 7 is housed in a state where the left end side of the armature 70 in FIG. 7 is housed in a gear casing (not shown). Attach to the gear casing.

However, in the conventional motor magnet retainer 50 described above, the curved pieces 50b, 50c, 50d and the curved pieces 50e, 50f, 50g are curved from three positions apart from each other on the upper end edge side and the lower end edge side of the base 50a. Since the supporting pieces 50h and 50i are respectively provided in a state of inverted V shape projecting from the base 50a, the bending pieces 50b and 50c are provided in a protruding state. , 50d, 50e, 50f, 50g are difficult to dispose on the retainer mounting portion 30a while pressing in the direction in which the curved portion is narrowed, which makes it difficult to assemble the motor yoke 30.

In addition, since the curved pieces 50b, 50c, 50d, 50e, 50f, 50g at six locations and the support pieces 50h, 50i at two locations in total are provided on the base 50a at separate locations, respectively, However, it is difficult to mold each of the pieces 50b, 50c, 50d, 50e, 50f, 50g, 50h, and 50i, which makes it difficult to improve productivity.

[0015]

[Problems to be solved by the device]

 The problem to be solved by the invention is that if the shape is complicated, it is difficult to assemble it to the motor yoke, and the productivity accompanying the production is poor.

[0016]

[Means for Solving the Problems]

 The retainer for the motor magnet according to the present invention has a simpler shape than the conventional one. Therefore, the motor yoke contact portion that contacts the retainer mounting portion of the motor yoke and the motor yoke retainer at the center of the motor yoke contact portion. A bent portion that is formed along the cylinder direction of the yoke and elastically presses the motor yoke contact portion along the inner peripheral wall of the motor yoke; and a motor yoke from the one end side of the motor yoke contact portion along the cylinder direction of the motor yoke. End projections protruding inwardly toward the inner peripheral side of the motor yoke and supporting the end wall of the motor magnet at one end along the cylinder direction of the motor yoke, and the inner peripheral wall of the motor yoke. Along both sides of the motor yoke abutment part in a U-shape projecting toward the centering direction of the motor yoke, and with respect to the side wall of the motor magnet along the cylinder direction of the motor yoke. The side wall support part that is pressed and supported by the elastic force of the bent part and the other end side along the cylinder direction of the motor yoke at the motor yoke contact part is inclined from the edge of the side wall support part toward the inside of the side wall support part. -Shaped insertion guide and both ends of the motor yoke abutting portion along the cylinder direction of the motor yoke project inwardly toward the inner peripheral side of the motor yoke and are folded with respect to the side wall of the motor magnet. The most important feature is that it has side wall abutment protrusions that come into contact with each other in the state of being bitten by the elastic force of the bending part, and it is extremely easy to assemble to the motor yoke and to improve productivity. Has been realized while having a sufficient function of holding the motor magnet on the motor yoke.

[0017]

[Action]

 In the retainer for a motor magnet according to the present invention, by inserting the insertion guide side of the side wall support portion into the retainer mounting portion along the cylinder direction of the motor yoke, the motor yoke contact portion abuts on the motor yoke, and the side wall support portion. Is pressed against and supported against the side wall of the motor magnet by the elastic force at the bent portion, and the side wall abutting projection is supported by being pressed against the side wall of the motor magnet by the elastic force at the bent portion, Since the end wall support projections abut and support the end wall of the motor magnet, it is extremely simple compared to the case where 6 curved pieces in total and 2 support pieces in total are provided on the base at separate locations. The motor magnet is held in the motor yoke with a unique shape.

[0018]

【Example】

 1 to 6 show an embodiment of a retainer for a motor magnet according to the present invention.

Here, on the inner peripheral side of the cylindrical motor yoke 60, curved motor magnets 61, 62, 63, 64 are formed along the inner peripheral wall 60 a of the motor yoke 60. And retainer mounting portions 60a1, 60a2, 60a3, 60a4 are formed between the motor magnets 61, 62, 63, 64 of the inner peripheral wall 60a.

As shown in FIG. 2, motor magnet retainers 1, 2, 3 and 4 are respectively attached to the retainer mounting portions 60a1, 60a2, 60a3 and 60a4.

Since the illustrated motor magnet retainers 1, 2, 3 and 4 have the same shape, here, the retainer mounting portion 60a1 formed between the motor magnet 61 and the motor magnet 62 is used. Only the retainer 1 for the motor magnet assembled in 1 will be described.

The motor magnet retainer 1 is made of steel having elasticity, and as shown in FIGS. 3 and 4, the motor yoke abutting portion 1a having a horizontally long rectangular plate shape is formed at the center. 1 is provided with a bent portion 1b formed along the cylinder direction of the motor yoke 60 in FIG. 1 and projecting upward in the drawing.

A curved surface 1a1 having a curvature that matches the inner peripheral wall 60a of the motor yoke 60 is formed on the lower side of the motor yoke contact portion 1a in FIG. 3, and the curved surface 1a1 is The motor yoke contact portion 1a is elastically pressed along the inner peripheral wall 60a toward the upper side and the lower side in FIG. 1 by the bent portion 1b in a state of being in contact with the inner peripheral wall 60a.

The left side of FIG. 3 and FIG. 4 of the motor yoke contact portion 1 a, which is one end side of the motor yoke 60 along the cylinder direction, is the inner peripheral side of the motor yoke 60. An end wall supporting protrusion 1c is provided which protrudes in an inverted V shape toward the upper side in FIG.

The distance between the front end portions of the end wall supporting protrusions 1c is larger than the distance between the motor magnet 61 and the motor magnet 62 arranged on the motor yoke 60.

In addition, the upper and lower ends of the motor yoke abutting portion 1 a in FIG. 4 are along the length direction of the motor yoke abutting portion 1 a, that is, in the cylinder direction of the motor yoke 60 and the motor yoke abutting portion. Side wall supporting portions 1d and 1e, which project in a U-shape from the portion 1a toward the upper side in the centripetal direction of the motor yoke 60 in FIGS. 5 and 6, are provided respectively.

The separation distance between the side wall supporting portions 1d and 1e is the motor magnet 61 and the motor magnet 62 arranged on the motor yoke 60 in the state before assembly shown in FIGS. 3, 4, 5, and 6. The distance between the side wall support portions 1d and 1e is slightly larger than the distance between the side wall supporting portions 1d and 1e, and the side wall supporting portions 1d 1 and 1e are elastically deformed by the bent portion 1b in a direction in which the distance is increased and a direction in which the distance is reduced.

Further, the side walls on the right side in FIG. 4 of the side wall supporting portions 1d and 1e, which are the other ends of the motor yoke abutting portion 1a along the cylinder direction of the motor yoke 60, are located on the right side walls. Insertion guides 1f and 1g, which are inclined toward the inside of the support portions 1d and 1e and projecting in an inclined shape, are provided respectively, and the distance between the tip portions of the insertion guides 1f and 1g is set to the motor yoke 60. It is smaller than the distance between the arranged motor magnet 61 and motor magnet 62.

Further, the motor yoke abutment portion 1a is located inside the motor yoke 60 from the motor yoke abutment portion 1a on both sides of the side wall support portions 1d and 1e at the upper end side and the lower end side in FIG. Side wall abutting protrusions 1h, 1i protruding toward the circumferential side are provided respectively, and the distance between the tip portions of the side wall abutting protrusions 1h, 1i is set to the motor yoke 60. It is slightly larger than the distance between the magnet 61 and the motor magnet 62.

Here, the motor magnets 61 and 62 arranged on the inner peripheral side of the motor yoke 60 have side walls 61 a and 62 a along the cylinder direction of the motor yoke 30 on the retainer mounting portion 60 a 1 side.

Therefore, a direction in which the separation distance between the side wall supporting portions 1d and 1e is made slightly smaller than the separation distance between the motor magnet 61 and the motor magnet 62 against the elastic repulsive force of the bent portion 1b by a jig (not shown) 1 with the insertion guides 1f and 1g first, the motor yoke contact portion 1a is brought into contact with the retainer mounting portion 60a1 while the motor magnets 61 and 62 are moved from the left side in FIG. I will insert it in the middle.

At this time, since the side wall supporting portions 1d and 1e are pressed in the direction in which the separation distance is slightly reduced, the separation distance between the tip portions of the side wall abutting protrusions 1h and 1i is also set to the motor magnet 61 and the motor magnet. It is inserted inside the motor yoke 60 in a state in which it is slightly smaller than the distance from 62.

When the end wall support projection 1c comes into contact with one end wall 61b, 62b of the motor magnets 61, 62 on the left side in FIG. 1, the side wall support portions 1d, 1e Remove the jig.

When the pressing of the jig against the side wall supporting portions 1d and 1e is released, the elastic restoring force of the bent portion 1b causes the distance between the side wall supporting portions 1d and 1e and the side wall contact. Since the protrusions 1h and 1i elastically return in the direction toward the return side where the distance between the tip portions of the protrusions 1h and 1i increases, the end wall support protrusion 1c contacts the end walls 61b and 62b on one side of the motor magnets 61 and 62. In the contact state, the side wall supporting portions 1d and 1e are in pressure contact with the side walls 61a and 62a of the motor magnets 61 and 62, respectively, and the tip end portions of the side wall abutting protrusions 1h and 1i are respectively in contact with the motor magnets 61 and 62. The side walls 61a and 62a come into contact with each other in a state of biting.

Further, by assembling the motor magnet retainers 2, 3, and 4 to the retainer mounting portions 60a2, 60a3, and 60a4 in the same manner as described above, the motor magnet retainers 1, 2, 3, and 4 are The motor magnets 61, 62, 63, 64 are held at predetermined positions on the inner circumference of the motor yoke 60.

Further, the armature 70 is housed inside the motor magnets 61, 62, 63, 64, and the right end side of the armature 70 in FIG. 1 is housed in a gear casing (not shown). The left end side and the right end side of 60 of FIG. 1 are rotatably supported by bearings (not shown), and the gear casing is attached to the right end side of the motor yoke 60 of FIG.

[0037]

[Effect of the device]

 As described above, since the retainer for the motor magnet according to the present invention has the above-mentioned configuration, by inserting the insertion guide side of the side wall support portion into the retainer mounting portion along the cylinder direction of the motor yoke, The side wall support is pressed against the side wall of the motor magnet by the elastic force at the bent portion, and the side wall abutment protrusion bites into the side wall of the motor magnet by the elastic force at the bent portion. Since the end wall support projections abut and support the end wall of the motor magnet at one end side along the cylinder direction of the motor yoke, there are 6 curved pieces in total and 2 support pieces in total. Compared with the ones installed on the base in separate locations, the shapes are much simpler, so assembly to the motor yoke is extremely easy and productivity is improved. In which exhibits an excellent effect that that.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a state in which a retainer for a motor magnet according to an embodiment of the present invention is attached to a motor yoke.

FIG. 2 is a right side view of the retainer for a motor magnet shown in FIG.

FIG. 3 is a front view of the retainer for motor magnet shown in FIG. 1 before being attached to a motor yoke.

FIG. 4 is a plan view of the retainer for the motor magnet shown in FIG.

5 is a right side view of the retainer for a motor magnet shown in FIG.

6 is a left side view of the retainer for a motor magnet shown in FIG.

FIG. 7 is a vertical sectional front view of a conventional motor magnet retainer attached to a motor yoke.

8 is a left side view of the motor magnet retainer shown in FIG. 7. FIG.

9 is a front view of the retainer for motor magnet shown in FIG. 7 before being attached to a motor yoke.

10 is a plan view of the retainer for the motor magnet shown in FIG. 7. FIG.

[Explanation of symbols]

1 Motor Magnet Retainer 1a Motor Yoke Contact Part 1b Bent Part 1c End Wall Supporting Protrusions 1d, 1e Side Wall Supporting Parts 1f, 1g Insertion Guide 1h, 1i Side Wall Abutting Protrusion 60 Motor Yoke 60a1, 60a2, 60a3, 60a4 Retainer Mounting Part 61, 62, 63, 64 Motor magnet 61a, 62a Side wall 61b, 62b End wall

Claims (1)

Claims for utility model registration: Claims: 1. A motor yoke abutting portion that abuts a retainer mounting portion provided between a plurality of motor magnets arranged along an inner peripheral wall of a motor yoke accommodating an armature; A bent portion that is formed in the center of the motor yoke contact portion along the cylinder direction of the motor yoke and elastically presses the motor yoke contact portion along the inner peripheral wall of the motor yoke; and a motor yoke at the motor yoke contact portion. An end wall support protrusion that protrudes in an inverted V shape from one end side along the cylinder direction toward the inner peripheral side of the motor yoke and that abuts and supports the end wall of the motor magnet on one end side along the cylinder direction of the motor yoke. One side and the motor yoke abutting portion along the inner peripheral wall of the motor yoke, projecting in a U-shape in the centripetal direction of the motor yoke, and along the cylinder direction of the motor yoke. A side wall supporting portion that presses and supports the side wall of the motor magnet by the elastic force of the bent portion, and at the other end of the motor yoke abutting portion along the cylinder direction of the motor yoke from the edge of the side wall supporting portion. An insertion guide protruding inwardly toward the inside of the side wall supporting portion, and a V-shape protruding toward the inner peripheral side of the motor yoke at both ends of the motor yoke abutting portion along the cylinder direction of the motor yoke, A retainer for a motor magnet, comprising a side wall abutment protrusion that abuts against a side wall of the motor magnet in a state of being bitten by an elastic force of a bent portion.