JP2584808Y2 - Thrust bearing structure - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to a thrust bearing structure, in particular, by positioning the sliding contact portion between the rotating shaft and the thrust receiving portion into the opening inside the commutator disposed around the rotary shaft, a commutator The distance from the thrust receiving portion can be reduced, and the small motor can be made thinner.

[0002]

2. Description of the Related Art Conventionally, a thrust bearing structure of this kind, for example, a rotary shaft 100 in a small motor as shown in FIG.
Of the sleeve 21 formed in the housing 200
0, two radial bearings 220, 23 fixed via
0 and a bearing 250 fixed to a side plate 240 (thrust receiving portion) fitted to the housing 200 so as to be rotatably supported. Power is supplied to the coil 120 wound around the armature 110 fixed to the rotation shaft 100 from the brush 130 via the commutator 140, so that the electromagnetic action between the coil 120 and the magnet 260 provided on the housing 200 is opposed to the armature 110. , A rotating torque is generated, and the rotating shaft 100 is rotated.

[0003] The thrust bearing structure used in such an apparatus has a rotating shaft 10 as shown in Figs.
0, the spherical projection 101 formed at least at the tip of the rotating shaft 100 is projected toward the thrust bearing 250 with respect to the opening 141 of the commutator 140 disposed around
The sliding surface 250 is in sliding contact with the smooth surface 251 of the thrust bearing 250 fixed to the side plate 240 (thrust receiving portion).

[0004]

However, in such a conventional thrust bearing structure, the protruding length 11 of the rotating shaft shown in FIG. 10 is used to avoid noise caused by contact between the commutator and the thrust bearing. The thickness 12 of the thrust bearing needs to be maintained at a constant thickness in order to maintain durability against sliding contact with the rotating shaft. Accordingly, as shown in FIG. 11, commutator open end
It is difficult to reduce the distance 13 between the thrust bearing and the back surface of the thrust bearing.
It was also difficult to reduce the interval of 40 (thrust receiving portion) plus the depth 14. Therefore, it has also been difficult to make a small motor using such a bearing structure thinner.

[0005] The present invention is to reduce the distance between the rotary shaft tip and the thrust receiving portion of the bearings structure, it has been, and an object thereof is to reduce the thickness of the small motor using this bearing structure.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention provides a rotating shaft disposed at the center of a rotating body, a thrust receiving portion for supporting the rotating shaft, and a rotating shaft. And a commutator disposed therein. The commutator has an open end protruding from the tip of the rotating shaft and a commutator.
A protruding part inserted into the opening of the
Part in the thrust receiving part and protrude inside the commutator opening.
By sliding the tip parts and the rotating shaft, rotatably supports the rotary shaft.

[0007]

The rotation shaft and the projection provided on the thrust receiving portion are slidably contacted inside the commutator , thereby reducing the distance between the commutator and the back surface of the thrust receiving portion to support the rotation shaft.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the thrust bearing structure of the present invention.
FIG. 4 is a cross-sectional view showing the example of FIG.

The thrust bearing structure 1 is applied to a small motor or the like shown in FIG. 9 and includes a rotating shaft 10 having a flat portion 11 formed at a tip and a side plate 240 fitted to a housing 200 shown in FIG. And a thrust receiving portion 30 composed of a recess 32 formed in the side plate 31 and a thrust bearing 33 fitted in the recess 32.

The rotating shaft 10 has a flat portion 11 formed by chamfering the periphery at the tip end, and has a rotating body (corresponding to the armature 110 in FIG. 9) around the same as the small motor shown in FIG. Radial bearing (the radial bearing 22 in FIG. 9)
0 , 230 ) and the thrust receiving portion 30.

The thrust receiving portion 30 has a side plate 3 corresponding to the side plate 240 fitted to the housing 200 of the small motor.
1 and a thrust bearing 33 fitted into the recess 32, and a spherical projection 34 having a smooth surface is formed on the rotating shaft 10 side of the thrust bearing 33. Ten flat portions 11 are pivotally supported.

A commutator 40 is mounted around the rotating shaft 10. The commutator 40 includes a commutator holder 41 that is in contact with the periphery of the rotating shaft 10 and a commutator segment 41 ′ that is fitted over the commutator holder 41. And the opening 4 of this commutator 40
The second side is formed to extend from a flat portion 11 formed at the tip of the rotating shaft 10. That is, the rotating shaft 10 is housed inside the commutator 40.

Accordingly, the sliding contact portion 20 between the flat portion 11 of the rotating shaft 10 and the spherical projection 34 of the thrust bearing 33 is located inside the commutator 40. At this time, the thrust bearing 3
The size of the spherical projection 34 is set such that the spherical projection 34 does not contact the end face of the commutator 40 or the inner peripheral surface of the commutator holder 41. For this reason, the commutator 40
The distance 13 between the opening 42 and the thrust bearing 33 can be reduced.

FIGS. 2A and 2B are a sectional view showing a second embodiment of the thrust bearing structure of the present invention and a perspective view of the thrust bearing 33. FIG. In this embodiment, the rotating shaft 1
0 is formed in a spherical shape with a smooth surface to form the sliding contact portion 12, and a smooth sliding contact surface 35a is formed on the thrust bearing 33.
Are formed. Then, as in the first embodiment, the sliding contact portion 12 of the rotating shaft 10 and the smooth sliding contact surface 35 a of the thrust bearing 33 are prevented from contacting the end surface of the commutator 40 or the inner peripheral surface of the commutator holder 41. The sliding contact portion 20 is located inside the commutator 40 and supports the rotating shaft 10. According to this example, the conventional rotary shaft can be diverted as it is, and a cost merit can be obtained, and the opening 42 of the commutator 40 and the thrust bearing 3
3 can be reduced.

FIG. 3 shows a third embodiment of the thrust bearing structure of the present invention.
It is sectional drawing which showed the Example. In this embodiment, a rotary shaft 10 and a thrust bearing 33 similar to those of the second embodiment are provided.
Then, the commutator holder 41 of the commutator 40 attached to the rotating shaft 10 is moved to the commutator segment 41 ′.
It is formed shorter, and a cylindrical projection 35 is disposed in the shortened portion, and the sliding contact portion 12 of the rotating shaft 10 and the flat
The rotating shaft 10 is supported at the sliding contact portion 20 with the smooth sliding contact surface 35a . According to this example, the conventional rotary shaft can be diverted as it is, and cost advantages can be obtained, and the commutator holder 41 can be shortened.

FIG. 4 shows a fourth embodiment. In this embodiment, a rotary shaft 10 similar to that of the second embodiment is used, but the configuration of the thrust receiving portion 30 is changed. That is, the thrust receiving portion 30 includes the thrust bearing 33 having the columnar portion 36 and the fitting shaft 36a protruding below the columnar portion 36 (side plate side). The fitting shaft 36a is formed to be slightly smaller than the diameter of the cylindrical portion 36. Then, the thrust bearing 33 inserts the cylindrical portion 36 into the opening 42 so as not to contact the commutator 40, and the fitting shaft 36 a
Is fixed in the concave portion 32 by press-fitting into a fitting hole 31 a formed in the side plate 31. In this example, the rotating shaft 10
Sliding contact portion 12 and the smooth sliding contact surface 36b of the thrust bearing 33
The sliding contact portion 20 is located inside the commutator 40,
The rotating shaft 10 is supported. According to this example, the conventional rotary shaft can be diverted as it is, and a cost merit can be obtained. Further, the protrusion 14 of the side plate 31 to the outside of the motor can be reduced, and the motor can be made thinner.

FIG. 5 shows a fifth embodiment. In this embodiment, the configuration of the thrust receiving portion 30 of the fourth embodiment is changed. That is, the thrust bearing 33 has the same shape, but the side plate 31 has a flat plate shape, and the fitting hole 3
1a is formed, a fitting shaft 36a is press-fitted into the fitting hole 31a, and the thrust bearing 33 is fixed. According to this example, the conventional rotary shaft can be diverted as it is, and a cost advantage can be obtained. Further, the interval l3 between the commutator 40 and the back surface of the side plate 31 can be reduced, and the motor can be made thinner. You.

FIG. 6A shows a sixth embodiment, in which a flat portion 11 is formed at the tip of a rotating shaft 10. On the other hand, the thrust bearing 33 of the thrust receiving portion 30
Is formed in a dish shape, and a locking claw 33a extending in an outer radial direction is formed on a peripheral edge thereof, and a hemispherical projection 3 is formed on a bottom portion 33b.
4 are protruding. The one side plate 31 is formed in a flat plate shape, and has a circular opening 31b at the center. Then, the engaging claw 33a of the thrust bearing 33 is engaged with the periphery of the opening 31b formed in the side plate 31, and the dish-shaped portion is opened.
1b, it is arranged on the side plate 31.

FIG. 6B shows that, in order to cope with a reduction in the thickness of the motor, the locking claws 33a are arranged at positions where the brushes are not arranged, and the brushes are arranged at the recesses of the thrust bearing 33. This is an example corresponding to a reduction in the thickness of the motor. Also in this example, the sliding portion 20 between the flat portion 11 of the rotating shaft 10 and the spherical protrusion 34 of the thrust bearing 33 is located inside the commutator 40. At this time, the size of the spherical projection 34 of the thrust bearing 33 is determined by the commutator 40.
And the inner peripheral surface of the commutator holder 41. Therefore, machining of the rotating shaft 10 is easy, or the interval 13 between the commutator 40 and the back surface of the thrust bearing 33 can be reduced, and the motor can be made thinner.

FIG. 7 shows a seventh embodiment. This embodiment is a modification of the sixth embodiment, and the thrust bearing 33 of the thrust receiving portion 30 is similar to that of the sixth embodiment. Having a configuration. The opening 31 is formed in the recess 32 of the side plate 31.
b is formed, and a step 31c is formed around the side plate 31 and the periphery of the opening 31b.
Is formed. By locking the locking claw 33a to the step portion 31c and fitting the dish-shaped portion into the opening 31b,
The thrust bearing 33 is provided on the side plate 31. Therefore, easy machining of the rotating shaft 10, or, commutator 40 and scan
The distance 13 from the rear surface of the last bearing 33 can be reduced, and the motor can be made thinner.

FIG. 8 shows an eighth embodiment. In this embodiment, a concave portion 32 is formed in a side plate 31 of a thrust receiving portion 30, and a column 32b having a flat surface 32a is formed at the bottom of the concave portion 32. The column 32b is integrally formed as a thrust bearing. Also in this example, the sliding contact portion 20 between the hemispherical projection 12 formed at the tip of the rotating shaft and the flat surface 32 a of the thrust bearing 33 is located inside the commutator 40. Therefore, the processing of the thrust bearing is easy, and the distance 13 between the commutator 40 and the back surface of the thrust bearing 33 can be reduced, and the motor can be made thinner.

If the sliding portion 20 is located inside the commutator 40 and the rotary shaft 10 is pivotally supported, it is of course applicable to changes in various design items made in other portions. It is.

[0024]

As described above, the sliding contact portion between the sliding contact surface formed at the tip of the rotating shaft and the projection provided on the thrust receiving portion supporting the rotating body is positioned inside the commutator. Small motor with thrust bearing
Also in such cases, the distance between the rotating shaft and the thrust receiving portion can be reduced by a simple configuration . Therefore , a high output can be obtained with the same dimensions as the conventional one, and the same output can be obtained with a thinner and smaller motor. Moreover,
Sliding contact between rotating shaft and thrust bearing is surrounded by commutator
Sparks and garbage will not reach the sliding part,
Long-term stable bearing function even with thrust bearings
Achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a thrust bearing structure of the present invention.

FIG. 2 is a view showing a second embodiment of the thrust bearing structure of the present invention, wherein a is a cross-sectional view and b is a perspective view of the thrust bearing.

FIG. 3 is a sectional view showing a third embodiment of the thrust bearing structure of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the thrust bearing structure of the present invention.

FIG. 5 is a cross-sectional view illustrating a thrust bearing structure according to a fifth embodiment of the present invention.

FIG. 6 is a view showing a thrust bearing structure according to a sixth embodiment of the present invention , wherein a is a sectional view, and b is a perspective view of the thrust bearing .

FIG. 7 is a sectional view illustrating a thrust bearing structure according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view showing an eighth embodiment of the thrust bearing structure of the present invention.

FIG. 9 is a sectional view showing a small motor using a conventional thrust bearing structure.

FIG. 10 is a partial sectional view showing a conventional thrust bearing structure.

FIG. 11 is a sectional view showing a conventional thrust bearing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thrust bearing structure 10 Rotary shaft 20 Sliding contact part 30 Thrust receiving part 31 Side plate 32 Recess 33 Thrust bearing 40 Commitator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-200221 (JP, A) JP-A-1-96757 (JP, U) JP-A-2-10776 (JP, U) JP-A-59 90253 (JP, U) Japanese Utility Model Showa 49-92908 (JP, U) Japanese Utility Model Showa 59-1222757 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 5/167 H02K 13 / 00

Claims (1)

(57) [Scope of request for utility model registration] 1. A a rotating shaft disposed at the center of the rotating body, this
Of the thrust receiving portion for supporting the rotary shaft, and a commutator disposed around the rotary shaft, the open end of the commutator causes protrude from the tip of the rotary shaft, before
Insert the commutator inside the commutator opening without contact
The thrust receiving portion is provided in the thrust receiving portion, and the
By sliding the tip of the rotary shaft and the projections in the open interior of the chromatography data, the thrust bearing structure characterized in that pivoted to the rotating shaft.