JP3249244B2 - Motor with sleeve bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a motor having a shaft rotatably inserted into a cylindrical portion of a housing, the shaft is rotatably supported via a ball bearing provided in the cylindrical portion. On the other hand, there is a type in which a shaft is rotatably supported by a cylindrical sleeve bearing instead of an expensive ball bearing, and an inexpensive and simple motor is provided.

[0003] In the motor provided with the above-described sleeve bearing, the shaft is supported in the thrust direction by using a thrust receiver and a stopper.

That is, while the tip of the shaft inserted into the sleeve bearing is supported by the thrust receiver, the movement of the shaft in the pulling-out direction from the sleeve bearing is caused by engaging a separately provided stopper with the shaft or rotor. To prevent it.

[0005]

However, in the motor having such a structure, it is necessary to use a thrust receiver and a retaining member for supporting the shaft in a thrust direction. There are problems such as troublesome work.

The present invention has been made in consideration of such problems of the prior art, and an object of the present invention is to provide a sleeve bearing capable of reducing the number of parts and facilitating assembly. To provide a motor provided with such a motor.

[0007]

Means for Solving the Problems] To achieve the above object, at <br/> shaft is fitted into the cylindrical portion of the housing to a motor provided with a sleeve bearing for rotatably supporting the cylindrical portion Te, the proximal end opening of the cylindrical portion, with the thrust receiving member for receiving a thrust force inserted and fixed in sliding contact with the proximal end face of the shaft, and provided with a preventing claw escape to the thrust receiving member, the shaft And a locking groove for locking the slip-off preventing claw.

[0008] It is also preferable that an oil reservoir is provided in the thrust receiving member for infiltrating and supplying oil to a sliding inner surface which is in sliding contact with the base end surface of the shaft.

[0009]

[Action] insert fixing the thrust receiving member to the base end opening of the cylindrical portion of the housing, the removal prevention claws provided on the thrust receiving member, if locked in the locking grooves of the shaft, the shaft is missing In the stopped state, it is rotatably supported by the cylindrical portion.

Further, the thrust receiving member can receive the thrust force of the shaft, and the shaft rotates smoothly in a stable state without excessive thrust play.

[0011]

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

FIG. 2 shows a fan device using a motor according to the present invention. The fan device includes a housing 2 having a cylindrical portion 1 and a shaft 3 rotatably inserted into the cylindrical portion 1.
And a stator 4 externally fitted and fixed to the cylindrical portion 1, and a rotor 5 fixed to the tip of the shaft 3.

The stator 4 includes a stator core 4a formed by laminating a plurality of thin plate-shaped cores, and a stator coil 4b wound around the stator core 4a. You.

The rotor 5 has a bowl-shaped holder 6.
And a rotor magnet 7 fixed to the inner peripheral surface of the holder 6. A plurality of blades 8 are provided on the outer peripheral surface of the holder 6.
Is protruding.

Thus, the cylindrical sleeve bearing 9 is fitted inside the cylindrical portion 1, and the shaft 3 is inserted into the sleeve bearing 9 so that the shaft 3 is rotatable. The sleeve bearing 9 is
For example, it is made of a sintered alloy or the like impregnated with oil.

A thrust receiving member 10 is inserted and fixed in the base opening 1a of the cylindrical portion 1. Thrust receiving member 10
As shown in FIG. 1, a disk-shaped main body portion 10a inserted into the cylindrical portion 1, an outer flange portion 10b protruding from an outer end of the main body portion 10a, and an inward direction from the main body portion 10a. And a plurality of projecting pieces 10c.

That is, when the thrust receiving member 10 is inserted into the base opening 1a of the cylindrical portion 1, the outer flange portion 10b is engaged with the base opening edge of the cylindrical portion 1 and the outer periphery of the main body 10a. The surface presses against the inner peripheral surface 11 of the cylindrical portion 1.

A plurality (for example, three to four) of the protruding pieces 10c are arranged at a predetermined pitch along the circumferential direction, and between the outer surface 12 thereof and the inner peripheral surface 11 of the cylindrical portion 1. A gap S having a predetermined interval dimension is formed.

At the end of each protruding piece 10c, a stopper 13 is provided which protrudes in the inner diameter direction. For example, as shown in the drawing, the slip-off preventing claw 13 is formed of a substantially right-angled triangular body having an inclined surface whose tip surface is inclined toward the base end side as it goes in the radial direction.

Further, the main body 10a of the thrust receiving member 10
On the inner surface of the is provided a recess 14 whose bottom surface is a curved surface,
In addition, the base end surface 15 of the shaft 3 is a curved surface (ball face), and the base end surface 15 of the shaft 3 is a concave portion of the thrust receiving member 10.
Fit into 14. As a result, the thrust receiving member 10 is
Thrust force.

At the base end of the shaft 3, there is provided a locking groove 16 formed of a circumferential groove.
13 locks. This prevents the shaft 3 from coming off in the axial direction.

In this case, the magnetic center of the stator 4
It is preferable that the magnetic center of the rotor magnet 7 is shifted by a predetermined dimension in the axial direction so that the rotor 5 receives a force toward the thrust receiving member 10.

The thrust receiving member 10 is preferably made of a synthetic resin (eg, polyphenylene sulfide) having low friction and excellent wear resistance, but may be metal.

Next, a method of assembling the motor will be described.
As shown in FIG. 3A, the thrust receiving member 10 is inserted and fixed in the base end opening 1a of the cylindrical portion 1, and in this state, the shaft 3
Into the cylindrical portion 1 along the direction of the arrow.

At this time, the stopper 13 comes into contact with the outer peripheral edge of the base end face 15 of the shaft 3. When the shaft 3 is further inserted from this state, the protruding piece 10 c is brought into contact with the base end face 15 of the shaft 3. Along the outer diameter, and expand as shown in FIG.
Between the protruding pieces 10c is allowed.

When the shaft 3 is further inserted, the stopper 13 is locked in the locking groove 16 of the shaft 3 as shown in FIG. 1, and the assembly is completed.

Also, as shown in FIG.
After that, the thrust receiving member 10 can be freely inserted from the base end side into the base end opening 1a of the cylindrical portion 1.

In this case, as shown in FIG. 4A, when the thrust receiving member 10 is inserted as shown by the arrow, the slip-off preventing claw 13 is fixed to the shaft 3 as in the case of FIG. If it is brought into contact with the outer peripheral edge of the base end face 15 and further inserted, it will be shown in FIG.
As shown in FIG. 1, the protruding pieces 10c are expanded to allow the receiving member 10 to be inserted into the cylindrical portion 1, and the outer flange portion 10b is formed at the base opening edge of the cylindrical portion 1 as shown in FIG. The receiving member 10 is inserted and fixed to the base end of the cylindrical portion 1 while being locked to the
13 is locked in the locking groove 16.

That is, by providing a gap S between the inner peripheral surface 11 of the cylindrical portion 1 and the outer surface 12 of the protruding piece 10c, the protruding piece 10c shown in FIGS. 3B and 4B is provided. Expansion is possible.

By the way, as shown in FIG.
13 is locked in the locking groove (that is, the thrust receiving member 10
When the base end surface 15 of the shaft 3 is fitted into the recess 14 of the shaft 3), a minute gap S ₁ (for example, a gap) is formed between the base end surface 13a of the stopper 13 and the base end surface 16a of the locking groove 16. Dimensions are about 0.2 mm). That is, the base end face 15 of the shaft 3
Is to be surely fitted into the recess 14 of the thrust receiving member 10.

Therefore, according to the motor constructed as described above, the shaft 3 is inserted into the cylindrical portion 1 in a state where the shaft 3 is prevented from coming off, and the thrust force is received by the thrust receiving member 10. The shaft 3 rotatably supported at 9 can rotate smoothly in a stable state.

FIG. 5 shows another embodiment. In this case, the thrust receiving member 10 is provided with an oil reservoir 17.

That is, a recess 19 for an oil reservoir is provided at the center of the base end face 18 of the thrust receiving member 10, and an oil impregnated material 20 impregnated with oil is fitted into the recess 19,
The oil reservoir 17 is formed by fitting a sealing member 21 made of, for example, synthetic rubber or the like outside the oil impregnating material 20.

The thrust receiving member 10 is made of a metal or the like through which oil easily penetrates.
The oil from 20 slides on the base end surface 15 of the shaft 3
Infiltrated up to 22.

Accordingly, the rotation of the shaft 3 becomes smoother and the durability is improved.

When the thrust receiving member 10 is made of a material that does not easily penetrate oil, a small diameter connecting the recess 19 and the recess 14 of the thrust receiving member 10 as shown by a two-dot chain line in FIG. If the oil supply passage 30 is formed, smooth rotation of the shaft 3 is realized.

In the embodiment shown in FIG. 6, the thrust receiving member 10 also serves as a radial bearing. That is, a sliding contact surface 10 d that slides on the outer peripheral surface of the shaft 3 is formed on the main body 10 a of the thrust receiving member 10 .

[0038] and in time, in each embodiment described above, the thrust receiving member 10 is formed by a single member, as shown in FIG. 7, it is also possible to form the two members.

That is, a first member 24 having a disk-shaped main body 24a, an outer flange 24b, and a projecting piece 24c is fitted to a recess 25 provided on the inner surface of the main body 24a of the first member 24. Second member
Consists of 26.

Accordingly, in this case, since the second member 26 receives the base end surface 15 of the shaft 3, the second member 26 may be formed of a resin or an alloy having low friction and excellent wear resistance. . At the tip of the protruding piece 24 c of the first member 24, a slip-off preventing claw 13 is formed.
And the shaft 3 is prevented from coming off.

It should be noted that the present invention is not limited to the above-described embodiment, and the design can be freely changed without departing from the scope of the present invention. For example, the number of the slip-off preventing claws 13 can be freely increased or decreased. The cylindrical shape of the shaft 3 is
Any shape may be used as long as the base end surface 15 of the shaft 3 is received by the thrust receiving member 10 and is locked in the locking groove 16 of the shaft 3.

The thrust receiving member 10 is inserted and fixed in the cylindrical portion 1. The magnetic center of the stator 4 and the magnetic center of the rotor magnet 7 are displaced in the axial direction so that the rotor 5 exerts a force on the thrust receiving member 10 side. When the thrust receiving member 10 is received, a force acts in a direction in which the thrust receiving member 10 comes out of the cylindrical portion 1. Therefore, such a problem can be solved by fixing the thrust receiving member 10 to the cylindrical portion 1 by screwing .

[0043]

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

When the thrust receiving member 10 is inserted and fixed in the base end opening 1a of the cylindrical portion 1 of the housing 2 and the shaft 3 is inserted into the sleeve bearing 9 in the cylindrical portion 1, the thrust receiving member 10 is provided. The pull-out preventing claw 13 is locked in the locking groove 16 of the shaft 3, and the shaft 3 is rotatably supported by the thrust receiving member 10 and the cylindrical portion 1 in a state where the shaft 3 is prevented from falling off.

Therefore, the assembling is easy, the thrust force can be received by the thrust receiving member 10, and the shaft 3 can rotate smoothly in a stable state.

Further, there is an advantage that no ball bearing is required, the cost is not increased, and the entire structure is not complicated.

Further, in the case where the oil sump portion 17 is provided, the base end surface 15 of the shaft 3 is provided with a thrust receiving member for a long time.
It can be smoothly received on the inner surface 22 of the sliding contact 10 and has excellent durability.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is an overall simplified cross-sectional view.

FIG. 3 is an explanatory view of an assembling process.

FIG. 4 is an explanatory view of another assembling process.

FIG. 5 is a cross-sectional view of a main part showing another embodiment.

FIG. 6 is a sectional view of a main part showing another embodiment.

FIG. 7 is a sectional view showing a modification of the thrust receiving member.
You.

[Description of Signs] 1 Cylindrical portion 1a Base end opening 2 Housing 3 Shaft 9 Sleeve bearing 10 Thrust receiving member 13 Detachment preventing claw 15 Base end surface 16 Locking groove 17 Oil reservoir 22 Inner sliding contact surface

Claims (2)

(57) [Claims] 1. A sleeve bearing 9 fitted inside the cylindrical portion 1 of the housing 2 and rotatably supporting the shaft 3 in the cylindrical portion 1.
At a motor having a proximal end opening portion 1a of the cylindrical portion 1
A thrust receiving member 10 that receives a thrust force by slidingly contacting the base end surface 15 of the shaft 3 is inserted and fixed, and a thrust preventing claw 13 for the shaft 3 is provided on the thrust receiving member 10. A motor provided with a sleeve bearing, wherein a locking groove 16 for locking the slip-off preventing claw 13 is provided. 2. A motor having a sleeve bearing according to claim 1, wherein an oil reservoir portion for permeating and supplying oil to a sliding inner surface of said shaft which is in sliding contact with a base end surface of said shaft is provided on said thrust receiving member. .