JP2766635B2 - Gear motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in maintaining a function of an oil seal for preventing a lubricating oil of a reduction gear portion from leaking to a motor portion in a gear motor. 2. Description of the Related Art In a conventional gear motor, a motor portion and a speed reducer portion connected to a rotating shaft of the motor portion are partitioned by a partition member, and the speed reducer portion is driven by the motor portion. At this time, the gear group of the reduction gear section is lubricated by the lubricating oil injected into the gear group. [0003] An oil seal is provided between the partition member and the rotating shaft, and when the lubricating oil in the reduction gear portion is scattered by the gear group, the oil seal allows the lubricating oil to pass through the rotating shaft insertion portion of the partition member. It prevents leakage through the motor. As described above, in the conventional gear motor, the main purpose of the oil seal is to prevent the lubricating oil in the speed reducer from leaking to the motor. There is not enough consideration given to the protection of That is, the scattered lubricating oil enters between the sliding portions of the oil seal and the rotating shaft to form an oil film, thereby performing both lubricating functions. , The abrasion powder also enters between the sliding parts, which not only deteriorates the lubrication function, but also damages the oil seal, and the heat generated by the rotation of the rotating shaft easily deteriorates the oil seal. Therefore, there is a problem that the life of the oil seal is significantly reduced. SUMMARY OF THE INVENTION An object of the present invention is to provide a gear motor capable of reliably extending the life of an oil seal in view of the above-mentioned problems of the prior art. In the present invention, the motor section and the reduction gear section are partitioned by a partition member, and lubricating oil for lubricating the reduction gear group is sealed in the reduction gear section.
The rotation shaft of the motor part extends through the partition member toward the reduction gear, and a pinion formed on the rotation shaft is meshed with a gear of the reduction gear part to reduce the rotational force of the motor part. In a gear motor that outputs through a reduction gear unit, a cylindrical collar mounted on a motor portion side of a pinion formed on the rotating shaft, and the lubricating oil provided between the partition member and the collar are formed by a motor. An oil seal that prevents leakage to the part, a bearing that supports the rotating shaft provided on the motor side of the oil seal,
A space portion provided with a cooling and lubricating oil having a higher viscosity than the lubricating oil provided on the speed reducer portion side of the oil seal, and a space between the speed reducer portion side of the space portion and the partition member and the collar. And a minute gap provided in the space. As described above, in the present invention, the cooling and lubricating oil is reserved in the space provided on the reduction gear section side from the oil seal between the partition member and the rotating shaft, and the cooling and lubricating oil is stored in the oil seal. Since an oil film is formed between the rotating shaft and the collar, and both are cooled by the oil film,
It is possible to prevent the oil seal from being deteriorated by heat generated by rotation of the collar. At this time, since both are lubricated by the oil film, and since the space portion prevents the intrusion of the lubricating oil in the speed reducer portion, there is no possibility that the abrasion powder in the lubricating oil is mixed with the cooling and lubricating oil in the space portion, and therefore, The lubricating function between the oil seal and the collar by the cooling and lubricating oil can be kept good. Also, since the cooling and lubricating oil has a higher viscosity than the lubricating oil and does not drip from the space of the collar, if the lubricating oil is previously injected into a position corresponding to the space of the collar, the assembling work of the parts can be performed. Can be carried out smoothly, and assembling workability can be improved accordingly. Moreover, even if the wear powder in the lubricating oil tries to enter the space,
Since the wear powder can be prevented from mixing with the lubricating oil,
There is no danger that the lubrication function will be reduced. An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a sectional view showing a gear motor to which one 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, a motor part 1 and a speed reducer part 2 are partitioned by a partition member 3. The motor unit 1 includes a rotating shaft 4 rotatably supported at both ends, a rotor 5 provided around a midway position of the rotating shaft 4, and a stator 6 arranged in an outer circumferential direction of the rotor 5. And a casing 7 surrounding the stator 6. An end bracket 9 that supports one end of the rotary shaft 4 via a bearing 8 is attached to an opening at one end of the casing 7, and the other end of the rotary shaft 4 is connected to the opening at 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 intermediate shaft 13 rotatably supported, and an intermediate shaft 13. An output shaft 16 having a second gear 15 meshing with a second pinion 14 provided at an intermediate position of the shaft 13 and rotatably supported, and a casing 17 surrounding the output shaft 16 are provided. The partition member 3 is attached to one end of the casing 17 at the opening, and the output side of the output shaft 16 is inserted into the other end. The partition member 3 penetrates the other end of the rotary shaft 4 and closes the other end opening of the motor casing 7 and the opening of the reduction gear casing 17 so that the motor 1 and the motor 1 are decelerated. It is divided between the machine unit 2. In order to lubricate the gear groups 12, 14, 15 inside the reduction gear unit 2,
Lubricating oil 18 is sealed in a space defined by the casing 17 and the partition member 3. Further, an oil seal 19 for preventing oil leakage is provided between the partition member 3 and the motor shaft rotating shaft 4. The oil seal 19 is provided between the rotary shaft insertion portion of the partition member 3 and the collar 20 mounted on the rotary shaft 4, and is disposed closer to the reduction gear unit 2 than the bearing 10. When the lubricating oil 18 is scattered by the gear groups 12, 14, 15, the lubricating oil 18 is prevented from leaking to the motor part 1, and the lubricating oil (not shown) in the bearing 10 leaks to the speed reducer part 2. I try to prevent it. For this reason,
The rotary shaft insertion portion of the partition member 3 is provided with a groove (not shown) having a shape capable of storing the oil seal 19. In the embodiment, a space 22 is provided between the partition member 3 and the rotary shaft 4 on the side of the reduction gear unit 2 from the oil seal 19, and the cooling / lubricating oil 21 retained in the space 22 is provided. The space between the oil seal 19 and the rotating shaft 4 is cooled. As shown in FIG. 2, the space portion 22 has an appropriate length in the axial direction and a radius at a position closer to the speed reducer portion 2 than the oil seal 19 of the rotary shaft insertion portion of the partition member 3. A large groove 23 formed with an appropriate depth in the direction, and a small gap 24 ′ formed between the large groove 23 and the collar 20 at an end closer to the reduction gear unit 2 and having a smaller size than the large groove 23. When the lubricating oil 18 is scattered by the rotation of the speed reducer unit gear groups 12, 14, 15, the lubricating oil 18 is prevented by the gap 24 'so as not to flow into the large groove 23. It is configured. When the cooling / lubricating oil 21 is injected into the space 22, the gap 24 'prevents the oil from leaking to the reduction gear unit 2 and holds the cooling / lubricating oil 21. Like that. When the cooling / lubricating oil 21 is retained in the large groove 23 of the space 22, the oil film forms an oil film between the lip piece of the oil seal 19 and the collar 20 mounted on the rotary shaft 4, and Both the seal 19 and the collar 20 are cooled and lubricated. As the cooling / lubricating oil 21, the lubricating oil 18 of the reduction gear unit 2 is
When entering the gap 24 'of the second gear, the wear powder in the lubricating oil 18 is prevented from being mixed, and at the time of assembling the gear motor, it is prevented from dripping when the oil is injected into a position corresponding to the space 22 of the collar 20. Lubricating oil 1
It is made of a material having a viscosity higher than 8, for example, grease. Further, the cooling / lubricating oil 21 has a structure that can be replaced from outside the gear motor. That is, the partition member 3 is formed with a discharge path 25 for discharging the cooling / lubricating oil 21 in the space 22 and an injection path 26 for injecting the cooling / lubricating oil 21 into the space 22. Then, the plug 27 fastened to the discharge passage 25 and the injection passage 26 is removed, and the cooling / lubricating oil 21 is replaced, so that the function of the cooling / lubricating oil 21 is further maintained. In the gear motor according to the embodiment, as described above, the cooling / lubricating oil 21 is reserved in the space 22 provided on the reduction gear unit 2 side from the oil seal 19 between the partition member 3 and the rotary shaft 4. The cooling and lubricating oil 21 forms an oil film between the oil seal 19 and the collar 20 mounted on the rotating shaft 4, and both are cooled by the oil film, so that the oil seal 19 is deteriorated by heat generated by rotation of the collar 20. Can be prevented. At this time, both are lubricated by the oil film, and the space 22 prevents the lubricating oil 18 in the speed reducer 2 from entering. The lubrication function of the oil seal 19 and the collar 20 by the cooling / lubricating oil 21 can be kept good. Since the cooling / combining lubricating oil 21 has a higher viscosity than the lubricating oil 18 and does not drip from the space 22 of the collar 20, the lubricating oil 21 is previously injected into a position corresponding to the space 22 of the collar 20. If this is done, the assembling work of the parts can be performed smoothly, 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 wear powder can be prevented from being mixed with the lubricating oil 21, the lubricating function does not deteriorate. Further, since the discharge passage 25 and the injection passage 26 are formed in the partition member 3 and the cooling / combining lubricating oil 21 can be exchanged from outside, if the lubricating oil 21 is replaced before its function is exhausted, The function of the lubricating oil 21 can be further maintained, and the operation of replacing the lubricating oil 21 can be easily performed without removing the parts. As described above, according to the present invention, the cooling / lubricating oil is reserved in the space provided between the partition member and the rotary shaft and closer to the reduction gear than the oil seal. Since the cooling and lubricating oil cools and lubricates both the oil seal and the rotating shaft, the oil seal may be deteriorated by the heat generated by the rotation of the rotating shaft or damaged by wear powder in the lubricating oil. And the function of the oil seal can be maintained satisfactorily, so that there is an advantage that the life of the oil seal can be reliably extended.

BRIEF DESCRIPTION OF THE 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. [Description of Symbols] 1 ... Motor part, 2 ... Reducer unit, 3 ... Partition member, 4 ... Rotary shaft, 18 ... Lubricant oil in the reducer unit, 19 ... Oil seal, 21 ... Cooling / lubricating oil for oil seal , 22 ... space part, 25 ... discharge path, 26 ... injection path.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Mikihiko Ohriki 7-1-1, Higashi-Narashino, Narashino-shi, Chiba Inside the Narashino Plant, Hitachi, Ltd. (72) Inventor Yasuhiro Miyanaga 7-1-1, Higashi-Narashino, Narashino-shi, Chiba No. 7 in Narashino Plant, Hitachi, Ltd. (72) Inventor Ryoichi Yamamoto 7-1, 1-1 Narashino, Narashino, Chiba Prefecture, Japan In Narashino Plant, Hitachi, Ltd. (56) References JP-A-60-84473 (JP, A) 60-77848 (JP, U) Kikai 60-148722 (JP, U) Kiuchi, “Machine Design Handbook”, New Edition, Nikkan Kogyo Shimbun, April 30, 1974, P.S. 587 (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/04 F16J 15/447 H02K 7/116

Claims (1)

(57) [Claims] The motor section and the reduction gear section are partitioned by a partition member, lubricating oil for lubricating the reduction gear group is sealed in the reduction gear section, and the rotation shaft of the motor section penetrates the partition member and the reduction gear section And a pinion formed on the rotating shaft is meshed with a gear of the reduction gear unit, and is formed on the rotating shaft in a gear motor that outputs the rotating force of the motor unit via the reduction gear unit. A cylindrical collar mounted on the motor portion side of the pinion, an oil seal provided between the partition member and the collar for preventing the lubricating oil from leaking to the motor portion, and a motor portion side of the oil seal. A space provided in the oil seal on the side of the speed reducer, in which a cooling / lubricating oil having a higher viscosity than the lubricating oil is reserved, and a reduction in the space. Giyamotoru characterized in that a small gap provided in the space between the a machine side and the partition member and the collar.