JPH04282058A - Geared motor sealing device - Google Patents

Abstract

PURPOSE:To maintain the long-term high sealing effect of a geared motor provided with speed reducing mechanism formed of a gear train. CONSTITUTION:A motor spindle 114 is rotatably supported by a bearing 121 provided at the joint cover (a part of a casing) 111 of a motor 110. The rotation of the motor spindle 114 is transmitted in the decelerated state to an output shaft 119 through a first pinion 115, a first gear 116, a second pinion 118 and a second gear 120. A throttle part 102 is formed at the joint cover 111 of such a geared motor 109, and two oil seals 103 are provided between this throttle part 102 and the bearing 121. An overshooting plate 104 is further provided at the motor spindle 114 between the throttle part 102 and the first pinion 115.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a sealing device for a geared motor, and more particularly, a sealing device for a geared motor that has a pinion attached to the motor main shaft and uses a gear train meshing with the pinion to decelerate and output the rotation of the motor main shaft. Pertains to.

0002

2. Description of the Related Art FIGS. 3 and 4 show an overall view of a geared motor 9 using a gear train and detailed views of its main parts.

As shown in these figures, a motor 10
Connect the casing 12 to the joint cover (part of the casing) 11.
is attached, and this joint cover 11 and casing 1
A deceleration mechanism 13 consisting of a gear train is provided within 2.

The speed reduction mechanism 13 includes a first pinion 15 mounted on a motor main shaft 14, a first gear 16 that meshes with the pinion 15, and a pinion shaft 1 that is the same as the first gear 16.
The main elements are a second pinion 18 attached to the output shaft 19, a second gear 20 attached to the output shaft 19, and meshed with the second pinion 18.

The motor main shaft 14 is rotatably supported by a bearing 21 provided on the joint cover 11, and the output shaft 19 is supported between the joint cover 11 and the casing 12.
It is rotatably supported by front and rear bearings 22 and 23 provided at the front and rear sides. A geared motor 9 is constituted by the motor 10, the casing 12, the speed reduction mechanism 13, and the like.

In the geared motor 9 having such a configuration, the rotation of the motor main shaft 14 is caused by the rotation from the first pinion 15 to the first gear 1.
6 and is decelerated while being transmitted from the second pinion 18 to the second gear 20, and the rotation is transmitted to the output shaft 19.

Furthermore, in such a geared motor 9, the lubricating oil or grease supplied to each gear and the bearings is supplied from the inside of the casing 12 to the outside, or from the inside of the casing 1.
An oil seal 24 is installed on the output shaft 19 side and an oil seal 25 is installed on the motor main shaft 14 side to prevent leakage from inside the motor 10. Further, an O-ring 26 is incorporated in the fitting portion between the joint cover 11 and the casing 12, and the lubricating oil and the like in the casing 12 are sealed off by these seal members.

At this time, as shown in detail in FIG. 4, the oil seal 25 on the motor main shaft 14 side extends from the hole 11A for the bearing 21 fitted in the joint cover 11 to the tip side of the motor main shaft 14. Seal fitting hole 11 formed by
It is inserted into B. A pressure-resistant seal may be used as the oil seal 25, or two oil seals may be used side by side.

[0009]

[Problems to be Solved by the Invention] Generally, in a reduction gear that uses a gear train, the meshing of the gears and the rotation of the motor main shaft 14, output shaft 19, etc. cause the meshing parts of the gears, the shaft, and the bearing part to become loose. Abrasion powder is generated at contact parts, etc.

[0010] In addition, in general, the temperature of a speed reducer increases during operation, and if there is no pressure regulating device, there is a problem in that the internal pressure increases.

Furthermore, depending on the installation location of the oil seal, grease etc. that may be scattered from the meshing parts of the gears may cause
Dynamic pressure may be applied to the lip of the oil seal.

By the way, the seal on the motor main shaft 14 of the conventional geared motor 9 is an oil seal 25 fitted into the seal fitting hole 11B penetrating the joint cover 11.
It is carried out by

Therefore, the grease mixed with the wear powder flows through the tooth groove of the first pinion 15 from the meshing portion of the first pinion 15 and the first gear 16, and enters the sealing surface of the oil seal 25 ( Arrow A). At this time, the oil seal 25 is subjected to dynamic pressure due to grease or the like, and the oil seal 25 itself is damaged by abrasion powder that has entered the seal surface, resulting in a problem that the sealing performance is deteriorated.

Such a problem also occurs when lubricating oil or the like from the bearing 21 on the inside of the geared motor 9, that is, on the motor 10 side, enters the oil seal 25 side.

Furthermore, in the conventional example, the motor main shaft 1
Seal number 4 is done with only oil seal 25, so
Even if the pressure inside the geared motor 9 increases, it cannot be absorbed, and there is a problem that the oil seal 25 is easily damaged and the sealing effect is poor.

The present invention has been proposed to solve the above-mentioned problems, and by providing a sealing device for a geared motor that can maintain a high sealing effect over a long period of time, the present invention solves the above-mentioned problems. Trying to solve problems.

[0017]

[Means for Solving the Problems] The present invention rotatably supports a motor main shaft in a casing via a bearing, a pinion is attached to the motor main shaft, and the casing and the motor are connected between the pinion and the bearing. In a geared motor sealing device configured to provide a sealing member for sealing between the main shaft, the casing extends between the pinion and the sealing member, and the casing is provided with a seal between the outer diameter of the motor main shaft and the casing. The above problem has been solved by forming a constriction portion having only a small gap.

[0018] Furthermore, the above problem is solved by installing a plate-shaped oil intrusion prevention plate having an outer diameter larger than at least the tip circle of the pinion between the pinion and the seal member on the motor main shaft. This is what I did.

Note that it is preferable that grease is sealed in the space of the seal member.

[0020]

[Operation] In the first invention, since the sealing member is guarded by the constricted portion formed in the joint cover (casing),
It is not directly exposed to dynamic pressure such as grease from the meshing parts of gears.

Furthermore, in the second invention, a plate-shaped oil infiltration prevention plate having an outer diameter larger than the tip circle of the pinion is installed between the seal member and the (first) pinion of the motor main shaft. Grease, etc. flowing out from the meshing parts of gears, etc. is shaken off by the infiltration prevention plate, and as a result, grease, etc. does not directly infiltrate into the throttle part or sealing member, maintaining high sealing effectiveness over a long period of time. can do.

[0022] Furthermore, if grease is sealed in the space of the seal member or the gap between the constriction part and the motor main shaft,
Even if the pressure inside the reducer increases, it can be absorbed, and it is also possible to prevent grease and the like from entering the sealing surface, resulting in an even higher sealing effect, thereby solving the above problems.

[0023]

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 show an overall view and a partially detailed view of a geared motor sealing device according to the present invention.

As shown in these figures, this geared motor 109 is basically the same as that of the conventional geared motor 9, especially in terms of the structure of its speed reduction mechanism.
Similar parts will be designated by the same reference numerals having the same last two digits, and descriptions of those parts will be omitted or simplified.

A first pinion 115 is attached to the tip of the motor main shaft 114 via a key 105 and a retaining ring 106, and the motor main shaft 114 is rotatably supported by a bearing 121.

The rotation of the motor main shaft 114 is transmitted from a first pinion 115 to a first gear 116, and then transmitted to an output shaft 119 by a speed reduction mechanism 113 via a second pinion 118 and a second gear 120.

A joint cover (part of the casing) 111, which is a fixed portion of the motor 110, extends between the first pinion 115 and the oil seal 103, and has a constricted portion 102 formed therein. This throttle portion 102 is connected to the motor main shaft 114.
A slight gap δ is formed between the outer diameter of the outer diameter and a predetermined width W in the axial direction.

Two oil seals (seal members) 103 are installed in the seal fitting hole 111B.

These throttle portions 102 and oil seals 10
Grease is sealed in the space 3.

The throttle portion 10 of the motor main shaft 114
2 and the first pinion 115 is provided with a swing plate 104 which is a member for preventing oil intrusion.

That is, the throttle portion 1 of the motor main shaft 114
02 is formed to have a diameter different from the outer diameter on which the first pinion 115 is mounted, and a swinging plate 10 formed of a disk-shaped iron plate is attached to this stepped portion 114A.
4 is installed. Here, the outer diameter of the swinging plate 104 is equal to the tip circle of the first pinion 15 and the constricted portion 102.
It is formed larger than the outer diameter of.

That is, the sealing device 101 is constituted by the constricting portion 102, the two oil seals 103, and the swing plate 104 as main elements.

Next, the operation of this embodiment will be explained.

The motor 110 is driven and the motor main shaft 11
4 rotates, the rotation starts from the first pinion 115, the first gear 116, the second pinion 118, and the second gear 12.
While passing through the speed reduction mechanism 113 consisting of 0, etc., the speed is reduced to a predetermined speed reduction ratio and transmitted to the output shaft 119.

At this time, the output shaft 119 is attached to the bearing 122.
, 123, the motor main shaft 114 is rotatably supported by a bearing 121. Further, the output shaft 119 has an oil seal 124, and the motor main shaft 114 has two oil seals 10.
3, each sealed.

The shaker plate 104 attached to the motor main shaft 114 rotates together with the motor main shaft 114 and shakes off oil grease and the like flowing from the tooth grooves of the gears of the reduction mechanism 113.

According to this embodiment as described above, the following effects are achieved.

That is, since the joint cover 11 is provided with a constricted portion 102 and grease is sealed in the gap between the constricted portion 102, it is possible to prevent grease or the like mixed with abrasion particles from penetrating into the oil seal 103. It can be prevented. Therefore,
Not only is the sealing effect high, but damage to the oil seal 103 can be reduced.

Furthermore, since the spaces between the two oil seals 103 are also filled with grease, it is possible to prevent grease mixed with abrasion particles from entering the oil seal lips. Therefore, this configuration also makes it possible to maintain a high sealing effect and reduce damage to the oil seal 103.

Furthermore, since grease is sealed between the two oil seals 103 and the throttle part 102, even if the pressure inside the reducer 109 increases, it can be absorbed and the pressure between the gears can be increased. It is also possible to reduce the influence of dynamic pressure caused by scattering of grease and the like during meshing.

[0042] Furthermore, since the swing plate 104 is provided on the motor main shaft 114, the direction of scattering of grease, etc. when the gears mesh with each other can be changed, and dynamic pressure is applied to the lip of the oil seal 103. can be prevented. Therefore, this configuration also maintains a high sealing effect,
Moreover, damage to the oil seal 103 can be reduced.

Furthermore, since two oil seals 103 are provided, there is a possibility that grease or the like mixed with abrasion powder may enter the lip of the inner oil seal 103, damaging the lip and weakening the sealing effect. However, it takes time for the grease etc. to reach the second oil seal 103, so the sealing effect continues for a long time.

It should be noted that the present invention is not limited to the above-described embodiments, but includes the following modifications.

That is, in the above embodiment, a disk-shaped plate made of iron is used as the swing-out plate 104, but it is not limited to this, and may be, for example, a square plate, or a plate made of oil-resistant resin. It may be. In short, it is sufficient if the flow of grease or the like from the tooth grooves of the first pinion 115 can be changed.

[0046] In addition, the specific structure and shape for carrying out the present invention may be other structures as long as the object of the present invention can be achieved.

[0047]

As explained above, according to the sealing device for a speed reducer of the present invention, the sealing member is double guarded by the swinging plate and the throttle portion, so that it is less susceptible to dynamic pressure. An excellent effect is obtained in that grease and the like mixed with abrasion powder do not directly infiltrate the oil seal, and therefore a high sealing effect can be maintained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a geared motor to which this embodiment is applied.

FIG. 2 is a detailed view of the same main part.

FIG. 3 is a partially sectional side view of a conventional geared motor.

FIG. 4 is a detailed view of the main part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 101... Geared motor sealing device, 102... Throttle part, 3, 103... Oil seal (sealing member), 9, 109
...Geared motor, 104...Divide plate (oil intrusion prevention member), 13, 11
3... Reduction mechanism, 14, 114... Motor main shaft, 19, 119... Output shaft.

Claims (3)

[Claims] 1. A seal member that rotatably supports a motor main shaft in a casing via a bearing, a pinion is attached to the motor main shaft, and is provided between the pinion and the bearing to seal between the casing and the motor main shaft. In the geared motor sealing device, the casing extends between the pinion and the sealing member, and the casing includes a throttle having a slight clearance between the casing and the outer diameter of the motor main shaft. 1. A geared motor sealing device, characterized in that a geared motor sealing device is formed with a section. 2. A sealing member that rotatably supports a motor main shaft in a casing via a bearing, a pinion is attached to the motor main shaft, and is provided between the pinion and the bearing to seal between the casing and the motor main shaft. In the geared motor sealing device configured to provide a geared motor, a plate-shaped oil infiltration prevention plate having an outer diameter larger than at least a tip circle of the pinion is installed between the pinion and the sealing member on the motor main shaft. A geared motor sealing device characterized by: 3. The geared motor sealing device according to claim 1, wherein grease is sealed in the space of the sealing member.