JPH07151212A - Method of maintaining oil seal function gear motor - Google Patents

Abstract

PURPOSE:To improve life of an oil seal by holding cooling and lubrication oil in a space part formed to a speed reducer side rather than the oil seal between a partition member and a rotational shaft and forming an oil film between the oil seal and a collar fit to the rotary shaft and cooling both of the oil seal and the collar by the oil film. CONSTITUTION:A space part 22 is formed at a reduction device side 2 rather than an oil seal 19 between a partition member 3 and a rotary shaft 4. Cooling and lubricating oil 21 is held in this space part, 21. An oil film is formed by this cooling and lubricating oil 21 between the oil seal 19 and a collar fit to the rotary shaft 4 and the oil seal 19 and the collar 20 are cooled. Lubricating function of the oil seal 19 with the collar 20 can be kept agreeably by the cooling and lubricating oil 21. The cooling and lubricating oil 21 has higher viscosity than lube oil and thereby, if lube oil 21 is lubricated in a position corresponding to the space part, 22 of the collar 20, assembling work of parts can be performed smoothly. Thereby, heat by rotation of the collar 20 is cooled and lubricated by the oil film of the cooling and lubricating oil 21. Accordingly, deterioration of the oil seal 19 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gear motor,
The present invention relates to a method for maintaining the function of an oil seal to prevent the lubricating oil of the reducer section from leaking to the motor section.

[0002]

2. Description of the Related Art In a conventional gear motor, a motor section and a speed reducer section connected to a rotation shaft of the motor section are partitioned by a partition member, and when the speed reducer section is driven by the motor section, the speed reduction is performed. The gear group of the machine section is lubricated by the lubricating oil that has been lubricated inside. Further, an oil seal is installed between the partition member and the rotating shaft, and when the lubricating oil in the reducer section is scattered by the gear group, the oil seal causes the lubricating oil to pass through the rotating shaft insertion section of the partition member and the motor section. I try to prevent it from leaking.

[0003]

As described above, in the conventional gear motor, the main purpose of the oil seal is to prevent the lubricating oil in the reduction gear section from leaking to the motor section. However, when the oil seal itself is protected. Regarding this point, sufficient consideration has not been given. In other words, the scattered lubricating oil enters between the sliding portion between the oil seal and the rotating shaft to form an oil film, which fulfills both lubricating functions, but the lubricating oil contains the abrasion powder of the gear group. As a result, the abrasion powder also enters between the sliding parts to lower the lubrication function and damages the oil seal, and the heat generated by the rotation of the rotating shaft significantly shortens the life of the oil seal. is there.

In view of the above problems of the prior art, it is an object of the present invention to provide a method for maintaining the function of an oil seal in a gear motor, which can reliably extend the life of the oil seal.

[0005]

According to the present invention, a partition member is provided between the motor section and the speed reducer section connected to the rotary shaft of the motor section, and lubricating oil is injected into the speed reducer section. In a gear motor provided with an oil seal for preventing the lubricating oil from leaking to the motor section between the partition member and the rotary shaft, the gear motor is provided on the speed reducer section side of the oil seal between the partition member and the rotary shaft and The space that holds the lubricating oil for cooling, which has a higher viscosity than the lubricating oil, prevents the lubricating oil from entering the reducer section into the motor section and cools between the oil seal and the rotating shaft. Is characterized by.

[0006]

As described above, in the present invention, the cooling / lubricating oil is reserved in the space provided on the speed reducer section side of the oil seal between the partition member and the rotary shaft, and the cooling / lubricating oil serves as the oil seal. Since an oil film is formed between the collar mounted on the rotating shaft and both are cooled by the oil film, the oil seal can be prevented from being deteriorated by the heat generated by the rotation of the collar. At that time, both of them are lubricated by the oil film, and the space portion prevents the lubricant oil from entering the speed reducer portion.Therefore, there is no possibility that the abrasion powder in the lubricant oil will mix with the cooling and lubricating oil in the space portion. The lubricating function of the oil seal and the collar by the cooling / lubricating oil can be well maintained.

Further, since the cooling / lubricating oil has a higher viscosity than the lubricating oil and does not drip from the collar space portion, if the lubricating oil is previously lubricated at a position corresponding to the collar space portion, the assembly work of parts is performed. Can be carried out smoothly and the assembling workability can be improved accordingly. Moreover, even if abrasion powder in the lubricating oil may enter the space, the abrasion powder is mixed with the lubricating oil. Since it can prevent fitting, there is no fear that the lubrication function will deteriorate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing a gear motor to which an embodiment of the present invention is applied, and FIG. 2 is an enlarged view showing a main part of FIG. In the gear motor of the embodiment, the motor unit 1 and the reduction gear unit 2 are partitioned by the partition member 3.

The motor unit 1 includes a rotary shaft 4 rotatably supported at both ends, a rotor 5 provided around an intermediate position of the rotary shaft 4, and a stator 6 arranged in the outer peripheral direction of the rotor 5. , And a casing 7 surrounding the stator 6. An end bracket 9 that supports one end side of the rotating shaft 4 via a bearing 8 is attached to the opening portion of one end of the casing 7, and the other end side of the rotating shaft 4 is attached to the opening portion of the other end via a bearing 10. A supporting partition member 3 is attached. The reduction gear unit 2 has a first gear 12 to be meshed with a first pinion 11 provided on the other end side of the rotary shaft 4, and an rotatably supported intermediate shaft 13; The second meshing with the second pinion 14 provided in the middle position
An output shaft 16 having a gear 15 and rotatably supported
And a casing 17 surrounding them.
The partition member 3 is attached to one end opening of the casing 17, and the output side of the output shaft 16 is inserted into the other end.

The partition member 3 is inserted through the other end of the rotary shaft 4 and closes the other end opening of the motor section casing 7 and the opening of the speed reducer section casing 17 to reduce the speed with the motor section 1. It separates from the machine section 2. Further, in order to lubricate the gear groups 12, 14, 15 inside the reduction gear unit 2,
Lubricating oil 18 is enclosed in a space defined by the casing 17 and the partition member 3. Further, an oil seal 19 for preventing oil leakage is arranged between the partition member 3 and the motor section rotary shaft 4. The oil seal 19 includes a collar 2 mounted on the rotary shaft insertion portion of the partition member 3 and the rotary shaft 4.
It is provided between the reduction gear unit 2 and the bearing 10 and is arranged on the reduction gear unit 2 side of the bearing 10.
When scattered by 2, 14, and 15, the lubricating oil 18 is prevented from leaking to the motor section 1, and the lubricating oil (not shown) in the bearing 10 is prevented from leaking to the reduction gear section 2. For this reason, a groove (not shown) having a shape capable of accommodating the oil seal 19 is provided in the rotary shaft insertion portion of the partition member 3.

Therefore, in the method of maintaining the function of the oil seal of the embodiment, the space portion 22 is provided between the partition member 3 and the rotating shaft 4 on the speed reducer portion 2 side by the oil seal 19 and is retained in the space portion 22. The cooling / lubricating oil 21 is used to cool the space between the oil seal 19 and the rotary shaft 4. As shown in FIG. 2, the space 22 has an appropriate length in the axial direction and an appropriate length in the radial direction at a position closer to the speed reducer 2 than the oil seal 19 of the rotary shaft insertion portion of the partition member 3. Large groove 23 formed with a depth of
Is formed in a size smaller than the large groove 23 at the end closer to the speed reducer portion 2 and has a minute gap 2 with the collar 20.
When the lubricating oil 18 is spattered by the rotation of the reduction gear unit gear groups 12, 14 and 15, the lubricating oil 18 is blocked by the gap 24 'and flows into the groove 23. It is configured not to.

Further, when the cooling / lubricating lubricating oil 21 is poured into the space portion 22, the space 24 prevents the lubricating oil from leaking to the speed reducer portion 2 and holds the cooling / lubricating lubricating oil 21. ing. The cooling / lubricating oil 21 is used in the space 2
When it is retained in the groove 23 of No. 2, an oil film is formed between the lip piece of the oil seal 18 and the collar 20 mounted on the rotary shaft 4 to cool both the oil seal 18 and the collar 20. I try to lubricate. Further, as the cooling / lubricating oil 21, when the lubricating oil 18 of the speed reducer portion 2 approaches the gap 24 'of the space portion 22, the abrasion powder in the lubricating oil 18 is prevented from being mixed with each other, and the gear motor In order to prevent dripping when oil is applied to a position corresponding to the space portion 22 of the collar 20 in the assembling process, the lubricant is made of a material having a higher viscosity than the lubricating oil 18, for example, grease. Further, the cooling / lubricating oil 21 has a structure that can be replaced from the outside of the gear motor. That is, the partition member 3 is formed with the discharge passage 25 for discharging the cooling / lubricating oil 21 in the space 22 and the injection passage 26 for injecting the cooling / lubricating oil 21 into the space 22. , The plug 27 that is fastened to the discharge passage 25 and the injection passage 26 is removed, and the cooling / lubricating oil 21 is replaced.
I try to maintain the function of.

The method for maintaining the function of the oil seal of the embodiment is as follows:
As described above, the space 22 provided between the partition member 3 and the rotary shaft 4 on the speed reducer section 2 side of the oil seal 19 is provided.
The cooling / lubricating oil 21 is held in the oil seal, and the cooling / lubricating oil 21 forms an oil film between the oil seal 19 and the collar 20 mounted on the rotating shaft 4, and both of them are cooled by the oil film. Can be prevented from being deteriorated by the heat generated by the rotation of the collar 20. At that time, both are lubricated by the oil film, and the space portion 22 prevents the lubricant oil 18 in the reduction gear portion 2 from entering. Therefore, the abrasion powder in the lubricant oil 18 is mixed with the cooling / lubricating oil 21 in the space portion 22. There is no danger of fitting, so the lubricating oil for both cooling 2
The lubrication function of the oil seal 19 and the collar 20 according to No. 1 can be kept good. Further, since the cooling / lubricating oil 21 has a higher viscosity than the lubricating oil 18 and does not drip from the space 22 of the collar 20, if the lubricating oil 21 is previously lubricated to a position corresponding to the space 22 of the collar 20, The assembling work of the parts can be smoothly carried out, and the assembling workability can be improved accordingly, and even if the abrasion powder in the lubricating oil 18 may enter the space 22, Since the powder can be prevented from being mixed with the lubricating oil 18, there is no fear that the lubricating function will deteriorate. Further, since the discharge passage 25 and the injection passage 26 are formed in the partition member 3 and the cooling / lubricating oil 21 can be replaced from the outside, the lubricating oil 21
If this is replaced before its function is exhausted, the function of the lubricating oil 21 can be further maintained, and in addition, the replacement operation of the lubricating oil 21 can be easily performed without removing parts.

[0014]

As described above, according to the first aspect of the present invention, the cooling / lubricating oil is retained in the space provided between the partition member and the rotary shaft on the speed reducer section side of the oil seal. The cooling and lubricating oil cools and lubricates both the oil seal and the rotating shaft.
It is possible to prevent the oil seal from deteriorating due to the heat generated by the rotation of the rotating shaft and from being damaged by the abrasion powder in the lubricating oil, so that the oil seal can maintain its good function. There is an advantage that the life can be surely extended. According to claim 2, in addition to claim 1, the partition member is configured to replace the cooling / lubricating oil in the space, so that the function of the lubricating oil can be further maintained. There is also an advantage that the work of replacing the lubricating oil can be easily performed without removing the parts.

[Brief description of drawings]

FIG. 1 is a sectional view showing a gear motor to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged view showing a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor part, 2 ... Reduction gear part, 3 ... Partition member, 4 ... Rotating shaft, 18 ... Lubricating oil in reduction gear part, 19 ... Oil seal, 21 ... Cooling lubricating oil for oil seal, 22 ... Space part , 25 ... discharge path, 26 ... injection path.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mikihiko Dairiki 7-1, 1-1 Higashi Narashino, Narashino, Chiba Prefecture Inside the Narashino Factory, Hitachi, Ltd. (72) Inventor Yasunori Miyanaga 7-1, Higashi Narashino, Narashino, Chiba Prefecture Issue Hitachi Ltd. Narashino Factory (72) Inventor Ryoichi Yamamoto 7-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Ltd. Narashino Factory

Claims (2)

[Claims] 1. A partition member divides the motor part from a speed reducer part connected to a rotary shaft of the motor part, and lubrication oil is injected into the speed reducer part to provide a space between the partition member and the rotary shaft. In a gear motor provided with an oil seal that prevents the lubricating oil from leaking to the motor section, a cooling lubrication provided on the speed reducer section side of the oil seal between the partition member and the rotating shaft and having a higher viscosity than the lubricating oil in the speed reducer. A method for maintaining the function of an oil seal in a gear motor, characterized in that a space for retaining oil prevents the inflow of lubricating oil from the reducer section into the motor section and cools between the oil seal and the rotating shaft. 2. A partition member is provided between the motor section and a speed reducer section connected to the rotary shaft of the motor section, and lubricating oil is injected into the speed reducer section to provide a space between the partition member and the rotary shaft. In a gear motor provided with an oil seal that prevents the lubricating oil from leaking to the motor section, a cooling lubrication provided on the speed reducer section side of the oil seal between the partition member and the rotating shaft and having a higher viscosity than the lubricating oil in the speed reducer. The oil holding space prevents the inflow of lubricating oil from the reducer section into the motor section, cools the space between the oil seal and the rotating shaft, and at the same time replaces the cooling lubricating oil in the space section. A method for maintaining the function of an oil seal in a gear motor, characterized by.