JPH11164510A - Lubricating oil leakage preventing structure of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent lubricating oil from scattering and sticking on a commutator or the like. SOLUTION: A rotating shaft 9 has a commutator 11 and is rotatably retained by a slide bearing 5. A cup washer 15 for preventing the lubricating oil of the sliding bearing 5 from scattering which is to be caused by the rotation of the rotating shaft 9 is forcibly inserted and fixed on the rotating shaft 9 between the sliding bearing 5 and the commutator 11. The commutator 11 has a recessed part 12a on the end surface of the sliding bearing 5 side. An end portion 15b of the cup washer 15 which is forcibly inserted in the rotating shaft 9 is arranged in the recessed part 12a. Thereby lubricating oil scattered in the peripheral direction is stuck in the recessed part 12a and held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil leakage prevention structure for preventing lubricating oil leaking from a motor bearing from adhering to a commutator or the like.

[0002]

2. Description of the Related Art As shown in FIG. 8, a conventional motor has a pair of sliding bearings 53 and 54 disposed in a housing 51 and an end frame 52. As shown in FIG. Slide bearings 53, 5
4 supports both ends of the rotation shaft 56 of the rotor 55 rotatably. The rotor 55 has an armature (armature) in the center.
The commutator 58 is provided on the rotation shaft 56 on the end frame 52 side.

As shown in FIG. 9, a slide bearing 53 on the end frame 52 side is attached so that lubricating oil does not leak. More specifically, the sliding bearing 53 has a spherical contact surface 53a formed at one end and a spherical contact surface 53b formed at the other end. And the sliding bearing 53 is
The spherical contact surface 53a contacts the bearing accommodating portion 52a formed on the end frame 52, and the spherical contact surface 53b contacts the spherical contact portion 59a of the lock washer 59 fixed to the end frame 52. Touched and supported. still,
The slide bearing 53 is an oil-impregnated bearing made of a porous sintered alloy that is lubricated by a lubrication packing 60. The lubricating packing 60 is provided on the outer peripheral side surface of the sliding bearing 53, at the end frame 5.
2 and the lock washer 59 are hermetically disposed. Further, the plain bearing 53 has a planar end face 53 c formed at the other end supported by a cup washer 62 via a thrust washer 61. The cup washer 62 is non-rotatably supported with respect to the rotating shaft 56 by being press-fitted and fixed to the rotating shaft 56. still,
The cup washer 62 has an outer peripheral portion extending toward the lock washer 59 so as to cover the other end of the slide bearing 53.

In the motor configured as described above, when the rotating shaft 56 rotates, the surface tension (capillary tube) between the sliding bearing 53 and the thrust washer 61 caused by the sliding of the thrust washer 61 and the centrifugal movement of the thrust washer 61. Due to the action of the force, the lubricating oil may flow out to the commutator 58 through the thrust washer 61. However, since the cup washer 62 is provided on the commutator 58 side, the lubricating oil is prevented from scattering and adhering to the commutator 58.

[0005]

However, since the cup washer 62 is press-fitted and fixed to the rotating shaft 56,
Lubricating oil may leak from the press-fitting gap. The leaked lubricating oil is scattered by the rotation of the rotating shaft 56 and the commutator 5
8 in some cases. This means that commutator 5
Abnormal wear of the brush that comes into sliding contact with No. 8 and problems such as overcurrent due to clogging of the contaminants may be caused.

In order to prevent the attachment to the commutator 58, it has been proposed to increase the distance between the cup washer 62 and the commutator 58. However, in this case, the outer shape of the motor becomes large, and the motor is securely attached. There is a problem that can not be prevented. Further, it has been proposed to provide an oil sump groove in the rotating shaft 56, but there is a problem that even if this is done, adhesion cannot be reliably prevented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent a lubricating oil from being scattered and adhering to a commutator or the like without fail. It is to provide a structure.

[0008]

According to a first aspect of the present invention, there is provided a rotating shaft having a commutator on an outer peripheral surface, and a bearing containing or coated with lubricating oil and rotatably supporting the rotating shaft. Lubrication of a motor having a flanged oil stopper mounted on the rotating shaft between the bearing and the commutator and for preventing lubricating oil of the bearing from scattering due to rotation of the rotating shaft. In the oil leakage prevention structure,
The commutator has a concave portion on the end surface on the bearing side,
The gist is characterized in that an end of the flanged oil stopper attached to the rotating shaft is arranged in the recess.

According to a second aspect of the present invention, in the lubricating oil leakage preventing structure for a motor according to the first aspect, a tapered surface is formed in the recess toward the direction of the rotating shaft, and the tapered surface of the tapered surface is formed. The gist is that an oil escape groove is formed in a deep portion reaching the rotation shaft.

[0010] The invention described in claim 3 is the invention according to claim 1 or 2.
The lubricating oil leakage prevention structure for a motor according to claim 1, wherein the concave portion is provided with a scattering prevention portion for preventing the lubricating oil from scattering outside the concave portion based on the rotation of the rotating shaft. And

According to the first aspect of the present invention, the flanged oil stopper prevents the lubricating oil of the bearing from scattering due to the rotation of the rotating shaft. Since the end of the flanged oil stopper mounted on the rotating shaft is arranged in a recess formed on the end face of the commutator on the bearing side, even if the lubricating oil leaks from the end, the lubrication is prevented. The oil is held in the recess and is prevented from scattering.

According to the second aspect of the present invention, when the commutator is disposed on the lower side of the bearing and used, the lubricating oil held in the recess is used in addition to the effect of the first aspect of the present invention. Flows along the tapered surface and further flows into the lower oil escape groove. Therefore, the scattering of the lubricating oil is reliably prevented.

According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention described in the above, the lubricating oil held in the concave portion is prevented from scattering outside the concave portion based on the rotation of the rotating shaft. Therefore, the scattering of the lubricating oil is reliably prevented.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a motor embodying the present invention; FIG.

As shown in FIG. 1, a motor housing 1 is provided.
Is formed in a bottomed cylindrical shape with an open upper end. An end frame 2 is attached to an upper end of the housing 1 with a bolt 3 so as to seal the housing 1.

The end frame 2 is formed in a closed cylindrical shape having an open lower end, a cylindrical holding portion 2a at the top, and a spherical housing concave portion 2b bent upward from the cylindrical holding portion 2a. Are formed. As shown in FIG.
A holding step 2c is formed on the inner peripheral surface of the holding portion 2a so as to protrude annularly. The lock washer 4 has an outer cylindrical portion 4a fitted to the holding portion 2a and an end of the outer cylindrical portion 4a supported by the holding step portion 2c. On the inner peripheral side of the lock washer 4, a spherical spherical dish portion 4b extending downward toward the center axis thereof is formed. The spherical dish portion 4b is open at the bottom.

The plain bearing 5 as a bearing is an oil-impregnated bearing made of a porous sintered alloy having a large number of holes (not shown). The slide bearing 5 is held in the housing recess 2b and the spherical dish 4b, and is disposed in the end frame 2. More specifically, the slide bearing 5 is formed in a substantially cylindrical shape, a spherical contact surface 5a is formed on an upper end side surface, and a spherical contact surface 5b is formed on a lower end side surface. . The sliding bearing 5 is held with the spherical contact surface 5a being in contact with the housing recess 2b of the end frame 2 and the spherical contact surface 5b being in contact with the spherical dish portion 4b of the lock washer 4. ing. Also, both end faces 5 of the sliding bearing 5
c and 5d are formed in a planar shape, and the both end faces 5 are formed at the center thereof.
A bearing hole 5e penetrating through c and 5d is formed. Oil supply packing 6 for supplying lubricating oil to the slide bearing 5
Is filled in a space formed by the slide bearing 5, the end frame 2 and the lock washer 4, and is held by the lock washer 4.

As shown in FIG. 1, a sliding bearing 7 is provided at the bottom of the housing 1 in the same configuration as the sliding bearing 5 provided on the end frame 2. The slide bearings 5 and 7 rotatably support the rotating shaft 9 of the rotor 8. The rotor 8 includes an armature 10 at the center,
A commutator 11 is provided on the rotation shaft 9 on the end frame 2 side.

As shown in FIGS. 2 and 3, the commutator 11 is provided with a plurality of contact sliding terminals 13 divided in the circumferential direction on the outer peripheral surface of a resin portion 12 formed in a substantially cylindrical shape. The end frame 2 is provided with a power supply brush 14 at a position corresponding to the contact sliding terminal 13 so as to be in sliding contact with the contact sliding terminal 13.

The resin portion 12 has a concave portion 12a formed on the end face on the end frame 2 side. The concave portion 12a has an opening surface formed in a circular shape, and has an inner peripheral side surface 12b vertically penetrated from the opening surface, and an armature 10 from the inner peripheral side surface 12b.
A taper surface 12c is formed toward the center axis direction of the resin portion 12 toward the side, and a through hole 12e is formed at the center thereof. The rotating shaft 9 is inserted into the through hole 12e so as not to rotate with respect to the commutator 11.

In the concave portion 12a of the resin portion 12,
As shown in FIG. 4, a cup washer 15 as a flanged oil stopper is press-fitted and fixed to the outer peripheral surface of the rotary shaft 9. More specifically, the cup washer 15 is mounted on the rotating shaft 9 such that the end portion 15b of the press-fitting cylindrical portion 15a formed inside the cup washer 15 is located at a position facing the inner peripheral side surface 12b. Press-fit fixed.
The cup washer 15 has a receiving portion 15c extending from the press-fitting cylindrical portion 15a in the outer peripheral direction, and a holding portion 15d extending to the lock washer 4 side is formed on the outer peripheral portion of the receiving portion 15c. . On the upper surface of the receiving portion 15c of the cup washer 15, a lower end surface 5d of the slide bearing 5 is pressed and supported via a thrust washer 16.

In the motor configured as described above, when the rotating shaft 9 rotates, the surface tension (capillary tube) action between the sliding bearing 5 and the thrust washer 16 caused by the sliding of the thrust washer 16 and the rotation of the thrust washer 16 Due to the action of the centrifugal force, the lubricating oil may flow out to the commutator 11 via the thrust washer 16. Then, the lubricating oil is held by the cup washer 15 so as not to be scattered. However, cup washer 15
Is press-fitted and fixed to the rotating shaft 9, so that the lubricating oil flows into the press-fitting gap, that is, the inner end 15 b of the cup washer 15.
May ooze out and leak. Then, the lubricating oil is scattered in the circumferential direction by centrifugal force due to the rotation of the rotating shaft 9, but the lubricating oil adheres and is held in the concave portion 12 a formed in the resin portion 12 of the commutator 11. Therefore, the lubricating oil is prevented from adhering to the contact sliding terminal 13 of the commutator 11.

Next, the characteristic operation and effect of the motor configured as described above will be described below. (1) In the present embodiment, the inner end portion 15 b of the cup washer 15, that is, the portion where the press-fitting gap through which the lubricating oil leaks is formed, is the concave portion 1 formed in the resin portion 12 of the commutator 11.
2a. Therefore, even if the lubricating oil oozes out from the inner end 15 b of the cup washer 15 and scatters in the circumferential direction due to the centrifugal force caused by the rotation of the rotating shaft 9, the recess 1
Adhered and held in 2a. As a result, in this motor, lubricating oil is prevented from adhering to the contact sliding terminal 13 of the commutator 11.

(2) In the present embodiment, the recess 12a
The resin portion 12 constituting the commutator 11 was provided in a recessed manner on the end face. Therefore, the cost does not increase in order to prevent the lubricating oil from adhering to the contact sliding terminals 13.

The above embodiment may be modified and implemented as follows. The commutator 11 of the above embodiment may be changed to a commutator 21 as shown in FIG. Commutator 2
1, a recess 21a is formed similarly to the commutator 11 of the above-described embodiment, and an oil escape groove 21c is formed in a deep portion of the tapered surface 21b reaching the rotation shaft 9. Three oil escape grooves 21c are formed at equal intervals in the circumferential direction. The oil escape groove 21c is formed to a predetermined position along the rotating shaft 9. In this way, when the commutator 21 is disposed below the slide bearing 5 and used, the recess 2
The lubricating oil held in 1a further flows along the tapered surface 21b into the oil escape groove 21c and is held. Therefore, it is possible to reliably prevent the lubricating oil from scattering and adhering to the contact sliding terminal 13 of the commutator 21. In addition, the oil escape groove 21c
May be formed in any number. Also, the intervals need not be equal.

The commutator 11 of the above embodiment may be changed to a commutator 22 as shown in FIG. The commutator 22 is the commutator 11 of the above embodiment.
A concave portion 22a is formed in the same manner as described above, and an annular convex portion 22b as a scattering prevention portion is formed at the opening end. The lower end of the projection 22b is connected to the cup washer 15.
Is disposed above the end portion 15b of the main body. In this case, even if the lubricating oil oozing out from the end portion 15b of the cup washer 15 and held in the concave portion 22a rises up the inner surface in the concave portion 22a due to the centrifugal force generated by the rotation of the rotating shaft 9,
Since it is securely held by the annular convex portion 22b in the concave portion 22a, it does not scatter outside.

The commutator 11 of the above embodiment may be changed to a commutator 23 as shown in FIG. The commutator 23 is the commutator 11 of the above embodiment.
A concave portion 23a is formed in the same manner as described above, and an annular groove portion 23b is formed on the inner peripheral surface thereof as a scattering prevention portion. The upper end of the groove 23b is disposed above the end 15b of the cup washer 15. In this way, the lubricating oil that has oozed out of the end portion 15b of the cup washer 15 and held in the recess 23a can be lifted in the recess 23a by the centrifugal force generated by the rotation of the rotating shaft 9 even if it rises inside the recess 23a. Is reliably held by the annular groove 23b, so that it does not fly outward.

In the above embodiment, the recess 12a is provided as a recess on the end face of the resin portion 12 constituting the commutator 11, but the recess 12a may be provided separately. Even in this case, the same effect as the effect (1) of the above embodiment can be obtained.

The sliding bearing 5 of the above embodiment may be changed to another bearing as long as it contains lubricating oil or is coated with lubricating oil. The technical ideas other than those described in the claims that can be grasped from the above embodiment will be described below together with their effects.

(A) In the structure for preventing leakage of lubricating oil for a motor according to claim 3, the scattering prevention portion (22b) has an annular projection (2) formed on the inner peripheral surface of the recess (22a).
2b) A structure for preventing lubricating oil from leaking from a motor, which is characterized in that 2b). This ensures that the lubricating oil is not scattered.

(B) In the structure for preventing lubricating oil leakage of a motor according to claim 3, the scattering prevention portion (23b) has an annular groove (2) formed on the inner peripheral surface of the recess (23a).
3b) A structure for preventing lubricating oil from leaking from a motor, wherein This ensures that the lubricating oil is not scattered.

(C) In the motor lubricating oil leakage preventing structure according to any one of (1) to (3) and (b), the recesses (12a, 21a to 23a) are provided with the commutator (11, 21). 23) A lubricating oil leakage prevention structure for a motor, wherein the lubricating oil leakage structure is recessed in the resin portion (12). By doing so, it is possible to prevent the lubricating oil from scattering at low cost.

(D) In the lubricating oil leakage prevention structure for a motor according to any one of claims 1 to 3 and any one of (a) to (c), the bearing (5) is a sliding bearing (5), and The bearing (5) is fixed to the end side surface (5) on the commutator (11, 21 to 23) side by a lock washer (4).
b) is supported, and the end face (5d) on the commutator side is supported by the flanged oil stopper (15) via a thrust washer (16) and is partitioned by the lock washer (4). In space,
A lubricating oil leakage prevention structure for a motor, wherein a lubricating packing (6) for supplying lubricating oil is provided on a side surface of the slide bearing.
By doing so, the same effect as the effect of the invention described in claim 1 can be obtained.

[0034]

As described in detail above, according to the present invention,
A lubricating oil leakage prevention structure capable of reliably preventing the lubricating oil from scattering and adhering to a commutator or the like can be provided.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view for explaining a motor in an embodiment.

FIG. 2 is a side view showing a commutator according to the embodiment.

FIG. 3 is a plan view showing a commutator according to the embodiment.

FIG. 4 is an explanatory diagram for explaining the periphery of the sliding bearing according to the embodiment.

FIG. 5 is a plan view showing a commutator in another example.

FIG. 6 is an essential part cross-sectional view showing a commutator in another example.

FIG. 7 is a sectional view of a main part showing a commutator in another example.

FIG. 8 is an essential part cross-sectional view for explaining a motor according to a conventional technique.

FIG. 9 is an explanatory diagram for explaining the periphery of a motor slide bearing according to the related art.

[Explanation of symbols]

5: sliding bearing, 9: rotating shaft, 11, 21 to 23: commutator, 15: cup washer, 12a, 21a to 2
3a: concave portion, 15b: end portion, 21b: tapered surface, 21c
... oil escape groove, 22b ... annular convex part, 23b ... annular groove part.

Claims (3)

[Claims] A commutator (11, 21 to 21) is provided on an outer peripheral surface.
A bearing (5) that contains or is coated with lubricating oil and rotatably supports the rotating shaft (9); a bearing (5) and the commutator (11, 23); 21-2
3) A flanged oil stopper (15) mounted on the rotating shaft (9) for preventing the lubricating oil of the bearing (5) from scattering based on the rotation of the rotating shaft (9). )
The commutator (11, 21 to 23) includes a concave portion (12a, 21a to) on an end surface on the bearing (5) side, and the flanged oil stopper (15). ) The rotating shaft (9)
The end (15b) to be attached to the recess (12a, 2)
A lubricating oil leakage preventing structure for a motor, wherein the lubricating oil leakage preventing structure is disposed in any of 1a to 23a). 2. The lubricating oil leakage prevention structure for a motor according to claim 1, wherein the concave portion (21a) has a tapered surface (21b) directed toward the rotating shaft (9). An oil leakage groove (21c) is formed in a deep portion of the motor (21b) reaching the rotary shaft (9). 3. The structure for preventing lubricating oil leakage of a motor according to claim 1, wherein said recess (22a, 23a) is provided with lubricating oil based on rotation of said rotary shaft (9). , 23a) to prevent scattering outside.
23b) A structure for preventing lubricating oil from leaking, wherein the structure is provided with 23b).