JP3131027B2 - Fan motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor.

[0002]

2. Description of the Related Art As shown in FIG. 10 , a cylindrical sliding bearing b rotatably supporting a shaft a, and a thrust plate fitted to the shaft a so as to be slidable on one end surface c of the sliding bearing b. d and the thrust plate d
And a stopper e for abutting and holding the thrust plate d, one end face of the thrust plate d and the stopper e
The thrust plate d is held by contacting the entire end surface of the thrust plate d.

[0003]

However, when the thrust plate d is held in such a structure, when the stopper e is pressed into the shaft a in a state where the stopper e is inclined with respect to the thrust plate d, the thrust plate d slides in the sliding bearing. There is a problem that a rubbing sound or the like is generated during rotation of the shaft a, or a local wear is generated on the thrust plate d due to the one-side contact with the one end surface c of b. Moreover, it has been difficult to suppress the inclination of the stopper e only by improving the processing accuracy of a single component.

Accordingly, an object of the present invention is to provide a fan motor which can solve such a conventional problem and eliminate rubbing noise during rotation and can prevent local wear.

[0005]

In order to achieve the above object, a cylindrical slide bearing which rotatably supports a shaft, and a thrust externally fitted to the shaft so as to be slidable on one end surface of the slide bearing. A circumferential projection formed near the outer peripheral edge of the thrust plate , the stopper including a plate, and a stopper for pressing and fixing the thrust plate to the shaft to abut and hold the thrust plate.
Sliding contact surface of the slide bearing abuts one end surface, and,
The stopper integrally connects the short cylindrical portion and the umbrella-shaped disk
It has, to form the non-contact micro gap on the outer periphery side of the said stopper and the thrust plate, of the disc portion of the stopper
The annular ridge formed near the periphery is the inner periphery of the thrust plate
In which an annular abutment edges closer abutting is configured to be formed.

[0006]

[Function] Even if the stopper is slightly press-fitted into the shaft with the thrust plate being slightly inclined with respect to the thrust plate, the stopper and the thrust plate are surely brought into contact at the annular contact portion, and the thrust plate and one end surface of the slide bearing are brought into contact. It slides evenly and does not hit one side.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 is a cross-sectional view of a fan motor according to the present invention. Reference numeral 1 denotes a plastic housing. This housing 1 has a central boss 1a on which a housing cylinder 2 is erected. Have.

Reference numeral 3 denotes a stator core which is externally fitted to the housing cylinder portion 2, and a stator coil 6 is wound around the stator core 3 via insulators 4 and 5.

The stator coil 6 is connected to a circuit board 39 via a terminal (not shown), and the circuit board 39 is attached to a central boss 1a to which a sheet 40 made of polyester, paper, or the like is adhered.

A bowl-shaped base 7 has a plurality of blades 8 projecting from an outer peripheral surface of the bowl-shaped base 7. A rotor magnet 10 is provided on the inner peripheral surface of the bowl-shaped base 7 via an annular yoke 9.
Is fixed, and the outer peripheral surface of the stator core 3 and the inner peripheral surface of the rotor magnet 10 face each other at a small interval.

A shaft hole is provided in the center hole of the bowl-shaped base 7.
The shaft 11 is fixed to a cylindrical sliding bearing 12
Is rotatably supported by the housing cylinder 2 via the shaft.

The sliding bearing 12 has a stepped surface 25 of the housing cylinder 2 and a thrust plate which receives a thrust force of the sliding bearing 12.
13 and slidably interposed therebetween.

As shown in FIGS. 2 and 3, the thrust plate 13 includes a disk portion 17 having an insertion hole 16 and a circumferential ridge 19 formed on the outer peripheral edge of one end surface of the disk portion 17. And a pair of convex portions 20, 20 formed on the other end surface of the disk portion 17 so as to face each other.

A thrust plate 13 has a through hole 16
The thrust plate 13 is rotatably passed through a shaft, and the thrust plate 13 is abutted and held by a stopper 15.

The stopper 15 includes a short cylindrical portion 21, an umbrella-shaped disk portion 22 having a predetermined inclination angle, and a pair of locking flat plate portions 23, 23 extending radially outward from the disk portion 22. And are integrally molded by a sheet metal press.

The short cylindrical portion 21 of the stopper 15 is press-fitted and fixed to the shaft 11, one end face 14 of the slide bearing 12, thrust
A flat sliding contact surface 18 of a circumferential ridge 19 protrudingly formed near the outer peripheral edge of the plate 13 is in contact with the disk portion 22 of the stopper 15 .
The annular ridge 24a formed near the periphery is formed by the thrust plate 13.
Abuts against the other end surface of the disk portion 17 of the first embodiment.

Thus, an annular contact portion S is formed near the inner peripheral edge of the stopper 15 and the thrust plate 13, and a non-contact minute gap G is formed near the outer peripheral edge.

Further, the flat portions 23 of the stopper 15 are engaged with the projections 20 of the thrust plate 13, so that the shaft 11, the stopper 15 and the thrust plate 13 can be integrally rotated in a predetermined direction.

The non-contact minute gap G is, for example, about 0.15 mm near the outer peripheral edge, and the gap gradually decreases from the outer peripheral edge to the inner peripheral edge. The diameter D of the annular contact portion S is, for example,
Is set to about D = B + 1 to 2 (mm) with respect to the outer diameter B of

If the stopper 15 and the thrust plate 13 are configured as described above, even if the stopper 15 is pressed into the shaft 11 with the stopper 15 slightly inclined with respect to the thrust plate 13, the stopper 15
The thrust plate 13 and the thrust plate 13 surely contact each other at the annular contact portion S, so that the thrust plate 13 and the one end surface 14 of the slide bearing 12 are evenly slidably contacted .

FIG. 4 and FIG. 5 is a (upper in Fig. 1) a plan view of the insulator 4 and the main part perspective view, FIG. 6 is a sectional view taken along line X-X of FIG. 1, FIG. 7 is a housing tube portion 2 FIG. 5 is a cross-sectional view of a main part showing a state before the insulators 4, 5 and a stator core 3 are assembled.

As shown in FIGS. 4 to 7 , the insulator 4 includes a fitting cylindrical portion 26, an end wall portion 27, and a tooth corresponding wall portion.
On the inner surface of the fitting cylindrical portion 26, a plurality of (four in the example in the figure) engaging projections 30 having a gradient surface 29 with a predetermined inclination angle θ are formed at a constant pitch in the circumferential direction.

Further, a small concave groove 31 is formed at a position corresponding to the engaging projection 30 of the fitting cylinder 26, and a plurality of small concave grooves 31 (four in the illustrated example) are formed at a constant pitch in the circumferential direction. Is done. The small concave groove portion 31 is formed in a tapered shape in which the groove width increases from the radially outer side to the radially inner side.

The insulator 5 shown in FIG. 7 (on the lower side in FIG. 7 ) comprises a cylindrical portion 32, an end wall portion 33, and a tooth corresponding wall portion. Walls for both teeth of insulators 4 and 5
28 ..., 34 ... are fitted into the teeth of the stator core 3,
A stator coil 6 is wound from above the insulators 4 and 5.

The housing cylinder 2 (upper side in the figure)
On the outer surface of the one end portion 38, a plurality of small projections 35 are formed to fit into the small concave grooves 31 of the insulator 4 so as to correspond to the small concave grooves 31, and are elastically engaged with the engaging protrusions 30 of the insulator 4. A matching recess 36 is provided. Reference numeral 37 denotes an inclined surface formed in the concave portion 36. The inclined surface 37 comes close to or comes into contact with the inclined surface 29.

Insulators 4 and 5 having stator coil 6 wound around housing cylindrical portion 2 and stator core 3
In order to assemble, the insulators 4 and 5 and the stator core 3 are externally fitted to the housing tube portion 2 and pushed in the direction of arrow C, and the engaging protrusions 30... And one end portion 38 of the housing tube portion 2 are elastically deformed. The small projections 35 are fitted into the small concave grooves 31, and the engagement projections 30 are engaged with the recesses.

Then, as shown in FIG. 1, the insulators 4, 5 and the stator core 3 are connected to the housing cylinder 2 while the one end 38 of the housing cylinder 2 is pressed radially inward by the resilient force of the engaging projections 30. while being securely fixed to the part 2, the end face 35a of the small projections 35, the end face 31a is engaged with the small recess groove portion 31, retaining the insulator 4, 5 and the stator core 3 is performed, as shown in FIG. 6 The left and right outer surfaces of the small protrusion 35 are in close contact with the left and right inner surfaces of the small groove 31.

By the way, the assembly of the housing tube portion 2 and the insulator 4, 5 and the stator core 3 are conventionally 10
As shown in FIG. 11 , the insulator corresponding portion j of the housing cylindrical portion h is tightened and fixed to the inside of the diameter by an insulator f having a fitting allowance in the fitting cylindrical portion g. In addition, the housing cylindrical portion h and the insulators f and k are bonded and fixed.

Alternatively, after the insulators f and k are externally fitted to the housing cylinder h, the protrusions m... Of the housing cylinder h are heated and bent in the outer diameter direction, and are pushed into the notches i. Was fixed by welding.

However, in the case of the above-mentioned fitting and fixing, it is difficult to control the diameter of the housing cylindrical portion h, and the sliding bearing b (in the illustrated example, the sliding bearing b is used, but a ball bearing may be used). However, there is a problem in that the insulators f and k are damaged due to being tightened. In the case of the above-mentioned adhesive fixing, it takes much time, and in the case of the above-mentioned welding fixing, there is a problem that the insulators f and k are apt to rattle.

However, according to the housing cylinder 2 and the insulators 4 and 5 shown in FIGS. 1 and 7 , only one end 38 of the housing cylinder 2 can be tightened and fixed inward in a radial direction.
Adhesion and welding are not required, and the slide bearing 12 is not tightened and damaged.

Further, by fitting the small concave groove 31 of the insulator 4 and the small projection 35, rattling in the circumferential direction can be prevented. In addition, the inclined surface 29 of the engagement protrusion 30 also functions as a guide surface, and facilitates insertion of the insulators 4 and 5 into the housing cylinder 2.

In FIG. 7 , a small projection 35, a concave portion 36 and the like are not provided at one end 38 of the housing cylindrical portion 2, but the outer peripheral surface thereof is formed up and down straight, and the outside of the stator 3 to the cylindrical portion 2 is formed. At the time of fitting, the cylindrical portion 2 is formed by the engagement protrusion 30 of the insulator 4.
One end portion 38 may be tightened and fixed inward, and a portion of the one end portion 38 may be melted to fill the small concave groove portion 31.

Therefore, the play in the circumferential direction, which is likely to occur when only the welding and fixing are performed, can be prevented by applying the frictional force due to the tightening of the protrusion 30.

FIG. 8 is a view of the housing 1 before the sheet 40 (see FIG. 1) is attached, as viewed from the bottom.
Consists of a body 41 surrounding the blades 8 and three arms 42, 42, 43 connecting the center boss 1a and the body 41.

Of the three arms 42, 42, 43, a guide groove 45 is provided in the wide arm 43, and lead wires 44 are wired. Further, a rectangular opening 46 is formed in the central boss 1a to the arm 43, and the lead wires 44 are connected to the circuit board 39 through the opening 46 by solders 50.

Reference numeral 47 denotes a holding member made of synthetic resin attached to one end of the opening 46. As shown in FIG. 9 , a plurality of holding pieces 49... The body can be pinched (held) to perform positioning with respect to the connection portion of the circuit board 39. This facilitates the soldering operation, and also makes it possible to automate the soldering operation.

[0039]

Since the present invention is configured as described above, the following significant effects can be obtained.

Even if the stopper 15 is press-fitted into the shaft 11 with the stopper 15 slightly inclined with respect to the thrust plate 13, the stopper
The thrust plate 13 and the thrust plate 13 surely contact at the annular contact portion S, so that the thrust plate 13 and one end surface 14 of the slide bearing 12 are evenly slid. Therefore, local wear of the thrust plate 13 due to the rotation of the shaft 11 can be prevented, the life is extended, and rubbing noise can be eliminated.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing one embodiment of the present invention.

FIG. 2 is a bottom view of a main part.

FIG. 3 is an enlarged sectional view of a main part.

FIG. 4 is a plan view of the insulator.

FIG. 5 is a perspective view of a main part of the insulator.

FIG. 6 is a sectional view taken along line XX of FIG . 1;

FIG. 7 shows a state before the insulator and the housing cylinder are assembled .
It is explanatory drawing which shows a state.

FIG. 8 is a bottom view of the housing.

FIG. 9 is an enlarged perspective view of a main part of a holding member.

FIG. 10 is a front sectional view showing a conventional example.

FIG. 11 is a plan view of a conventional insulator.

[Explanation of symbols]

11 Shaft 12 Slide bearing 13 Thrust plate 14 One end face 15 Stopper 18 Sliding surface 19 Circular ridge 21 Short cylindrical part 22 Disk part 24a Annular ridge G Non-contact small gap S Annular contact part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 49-7328 (JP, U) JP 2-110961 (JP, U) JP 4-43362 (JP, U) JP 2-U 83654 (JP, U) Shokai 63-48357 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 5/16-5/167 F16C 17/10 H02K 7/14

Claims (1)

(57) [Claims] 1. A cylindrical slide bearing 12 rotatably supporting a shaft 11, a thrust plate 13 slidably contacting one end surface 14 of the slide bearing 12, and externally fitted to the shaft 11. Pressing and fixing the thrust plate 13
And a stopper 15 for holding the thrust plate 13.
The sliding contact surface 18 of the circumferential ridge 19 formed near the periphery is
Abuts against one end surface 14 of the bearing 12;
Has a short cylindrical portion 21 and an umbrella-shaped disk portion 22 integrally,
A non-contact minute gap G is formed near the outer peripheral edge of the stopper 15 and the thrust plate 13, and the disc portion 22 of the stopper 15 is formed.
The annular ridge 24a formed near the inner peripheral edge of the
A fan motor characterized in that an annular contact portion S is formed so as to contact the inner peripheral edge of the plate 13 .