JPH0651610U - Lubricating oil circulation device for speed reducer - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] By circulating all the lubricating oil in the reducer body without retaining it, deterioration of the lubricating oil can be prevented and the metal contained in the circulating lubricating oil can be prevented. Foreign matter such as abrasion powder is collected and removed, and the lubricating oil in the reducer body is always kept clean. [Structure] A bearing 1 for supporting the output shaft of a reduction gear output shaft 8.
While installing the impeller 30 below 2,14,
A pump chamber 32 is formed by the impeller and the speed reducer body. A discharge port 34 of the pump chamber and a lubricating oil inlet 224 provided at the upper part of the main body are connected by a lubricating oil flow pipe 38, and a filter is arranged in the lubricating oil flow pipe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating oil circulation device for a speed reducer used in a turning device of a hydraulic excavator.

[0002]

[Prior art]

 A hydraulic excavator as a work machine includes a lower traveling body and an upper rotating body mounted on the traveling body so as to be rotatable about an axis extending in the vertical direction. A turning device is interposed between them. A speed reducer is attached to this turning device. The speed reducer has a drive source such as a hydraulic motor arranged on an upper part thereof, and a speed reducer main body which accommodates an output shaft thereof, that is, a speed reducer input shaft, a reduction gear mechanism arranged in the main body and connected to the input shaft, The output shaft is connected to the reduction gear mechanism and is rotatably supported by a bearing in the lower portion of the main body.

In such a speed reducer, a planetary gear type speed reducer is generally used as a speed reducer gear mechanism, and a space between the speed reducer main body and the speed reducer gear mechanism arranged inside the reducer mechanism is limited due to space limitations and the like. There are few, and it is compactly constructed as a whole. For this reason, the amount of lubricating oil that can be stored in the reducer body is small, the heat generated inside the reducer body is poorly dissipated, and the temperature of the lubricating oil tends to rise. Therefore, there is a problem that the lubricating performance deteriorates and the lubricating oil deteriorates early. Moreover, since the amount of lubricating oil is small, there is a problem that the lubricating oil is contaminated early by the metal abrasion powder generated at the gear meshing portion. Continuing operation with the lubricating oil deteriorated or contaminated may cause imperfections such as seizure and fatigue on the rolling contact surfaces and sliding surfaces of the gears, shafts and bearings, which may cause premature failure. Must be regularly replaced with new oil, and at the same time foreign matter in the lubricating oil must be removed, which requires time and labor.

In order to solve such a problem, the applicant of the present invention has proposed a lubricating oil circulating device for a speed reducer in which the lubricating oil inside the speed reducer is forcibly circulated, as disclosed in Japanese Patent Application No. 1-73512. 14361). The lubricating oil circulating device for a speed reducer includes a speed reducer main body that accommodates an input shaft connected to a drive source at an upper portion thereof, a speed reduction gear mechanism arranged in the main body and connected to the input shaft, and the speed reduction gear mechanism. A lubricating oil circulation device for a speed reducer having an output shaft rotatably supported by upper and lower two bearings at the lower part of the main body, wherein an impeller is attached to the output shaft located in the space between the upper and lower two bearings. A pump chamber is formed between the reducer body and the reducer body, and the discharge port of the pump chamber and the lubricant oil inlet provided at the upper part of the reducer body are connected by a lubricant oil flow path means having a filter During operation of the reducer, the pumping action of the impeller that rotates with the output shaft forces the lubricating oil in the reducer body to circulate through the lubricating oil passage means.

[0005]

[Problems to be Solved by the Invention]

 Thus, according to the lubricating oil circulation device for the speed reducer, the lubricating oil is forcedly circulated during the operation of the speed reducer, so that the cooling oil is cooled and foreign matters such as metal abrasion powder are caught by the filter. Since it was collected, there was an effect that it was less likely to be contaminated, but there were the following problems to be solved.

In the lubricating oil circulation device for the speed reducer, the pump chamber is provided in the space between the two bearings that support the output shaft, and is not located at the bottom of the speed reducer body. That is, foreign matter such as deteriorated lubricating oil and metal wear powder is retained in the lower bearing portion, and the foreign matter is caught in the reduction gear mechanism and the bearing and damages them. Deterioration may cause seizure or fatigue of the bearing at an early stage.

The present invention has been made in view of the above points, and its main technical problem is to prevent the deterioration of the lubricating oil by circulating all of the lubricating oil in the main body of the reducer without making it stagnate. At the same time, it collects and removes foreign matter such as metal abrasion powder contained in the circulating lubricating oil and keeps the lubricating oil in the reducer body clean at all times. To provide.

Another technical problem of the present invention is to provide a lubricating oil circulation device for a speed reducer, which can secure a circulating amount of lubricating oil even when the lubricating oil temperature decreases and the viscosity becomes large in cold weather. To provide.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned main technical problems, according to the present invention, a reducer body, which accommodates an input shaft connected to a drive source, is disposed in the main body and is connected to the input shaft. A lubricating oil circulation device of a reduction gear having a reduction gear mechanism and an output shaft connected to the reduction gear mechanism and rotatably supported by a bearing at a lower portion of the main body, wherein the output shaft is connected to the output shaft below the bearing. A pump chamber is formed by the impeller that rotates integrally with the main body, the pump chamber is formed by the impeller and the main body, and a discharge port of the pump chamber is connected by a lubricating oil flow passage means, and a filter is attached to the lubricating oil flow passage pipe. Disclosed is a lubricating oil circulating device for a speed reducer.

The other technical problems described above can be achieved by disposing an auxiliary pump in the lubricating oil flow path pipe.

[0011]

[Action]

 In the lubricating oil circulation device of the speed reducer according to the present invention, the impeller mounted below the bearing of the output shaft supported by the bearing below the speed reducer body is rotated together with the output shaft when the speed reducer is operating. By the pumping action of the rotation of the impeller, the lubricating oil in the speed reducer body is sucked to the bottom of the speed reducer body, is once guided to the outside through the lubricant oil flow pipe, and is installed on the speed reducer body. It is circulated to the reducer body from the provided lubricating oil inlet. In this circulation process, foreign matter such as metal abrasion powder contained in the lubricating oil is collected and removed by the filter provided in the lubricating oil passage means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A detailed description will be given below with reference to the accompanying drawings showing a preferred embodiment of a lubricating oil circulating device for a speed reducer constructed according to the present invention.

Referring to FIG. 1, the speed reducer 2 is a planetary gear type speed reducer and has a speed reducer main body 20. The speed reducer main body (casing) 20 is composed of an upper casing 22, a ring gear 24 and a lower casing 26, which are arranged in the above-mentioned order from the upper portion thereof and fixed to each other. A hydraulic motor 50, which is a drive source, is arranged on the upper surface of the upper casing 22, and has a hole 222 through which the output shaft of the hydraulic motor 50, that is, the input shaft 4 of the speed reducer is inserted. A planetary gear type reduction gear mechanism 6 connected to the input shaft 4 and the ring gear 24 is disposed in the reduction gear body 20. An output shaft 8 having one end connected to the planetary gear type reduction gear mechanism 6 and a pinion gear 82 at the other end is disposed so as to penetrate the lower casing 26, and is rotatable by two upper and lower bearings 12 and 14. It is supported. An impeller 30 is mounted on the output shaft 8 at a position located on the other side of the lower bearing 14 so as to rotate integrally with the output shaft. As shown in FIG. 3, the impeller 30 includes a cylindrical portion 302, a flange portion 303 radially formed from one end of the cylindrical portion, and a plurality of radial members formed between the cylindrical portion and the flange portion. The rotary vane 304 and the cylindrical portion 302 are fitted and fixed to the output shaft 8, and the lower casing 26 forms a pump chamber 32. A cover 40 is attached and fixed to the lower surface of the lower casing 26 with bolts 42, and a discharge port 34 communicating with the pump chamber 32 is formed by the lower casing 26. A communication passage 36 communicating with the discharge port 34 is formed in the lower casing 26, and one end of a lubricating oil flow passage pipe 38 is connected to the communication passage. The end is connected to a lubricating oil inlet 224 provided in the upper casing 22. A filter 40 and an auxiliary pump 42 are arranged in the lubricating oil passage pipe 38.

Next, the operation of the lubricating oil circulation device for the above-described speed reducer will be described.

When the hydraulic motor 50, which is a drive source, operates, the driving force is transmitted from the input shaft 4 of the reduction gear to the planetary gear type reduction gear mechanism 6, where it is decelerated and transmitted to the reduction gear output shaft 8. To be done. When the output shaft 8 rotates, the impeller 30 mounted so as to rotate integrally with the output shaft is rotated. As a result, the lubricating oil 100 in the speed reducer body 20 is sucked into the pump chamber 32 and discharged to the discharge port 34. The lubricating oil discharged from the pump chamber 32 to the discharge port 34 passes through the communication passage 36 and the lubricating oil flow passage pipe 38 and the passing filter 40. In the process of passing through the filter 40, foreign matter such as metal abrasion powder contained in the lubricating oil is collected and removed by the filter, and the contaminated lubricating oil is purified. The lubricating oil purified by the filter 40 is returned to the inside of the speed reducer main body 20 from the lubricating oil inlet 224 provided in the upper casing 22 via the lubricating oil passage pipe 38. Thus, during operation of the speed reducer 2, the impeller 30 mounted on the output shaft 8 of the lower casing 26 constituting the speed reducer main body is constantly rotated. Therefore, due to the pump action, all of the lubricating oil 100 in the speed reducer main body 20 is circulated and is purified by the filter 40 in this circulation process, so that it is always maintained in a clean state.

When the temperature of the lubricating oil decreases and the viscosity increases in the cold, and the amount of lubricating oil discharged by the pumping action of the impeller 30 decreases, the auxiliary pump 42 is operated to operate the lubricating oil. Can be smoothly circulated.

Further, by disposing an oil cooler in the lubricating oil passage pipe 38, the lubricating oil heated by being stirred by the reduction gear mechanism 6 can be cooled, and the lubricating performance can be maintained and maintained. It is possible to prevent early deterioration of the lubricating oil. Further, by disposing an oil heater in the lubricating oil flow pipe 38, it is possible to adjust the viscosity of the lubricating oil during cold weather.

[0018]

[Effect of device]

 The lubricating oil circulation device of the speed reducer according to the present invention is configured as described above, and the impeller is mounted on the output shaft of the speed reducer below the bearing that supports the output shaft, and the pump chamber is formed by the impeller and the speed reducer body. Since the discharge port of the pump chamber and the lubricating oil inlet provided in the upper part of the main body are connected by the lubricating oil flow pipe, and the filter is arranged in the lubricating oil flow pipe, With the pump action, all the lubricating oil in the reducer body can be circulated at all times during operation of the reducer, and foreign matter such as metal abrasion powder contained in the lubricating oil is collected by the filter during this circulation process. The contaminated lubricating oil is purified as it is removed. Therefore, it is possible to prevent damage to the reduction gear mechanism, bearings, etc. due to foreign matter trapped due to the accumulation of foreign matter such as metal abrasion powder in the reducer body, and to keep lubricating oil in the reducer body at all times. It can be kept clean.

Further, in the present invention, by providing an auxiliary pump in a lubricating oil flow path that connects a discharge port of the pump chamber and a lubricating oil inlet provided at an upper portion of the speed reducer body, a cold pump is provided. Even when the temperature of the lubricating oil decreases and the viscosity increases to reduce the amount of lubricating oil discharged by the pumping action of the impeller, the lubricating oil can be circulated smoothly by operating the auxiliary pump. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a lubricating oil circulation device for a speed reducer according to the present invention.

FIG. 2 is a perspective view of an impeller that is a component of the lubricating oil circulation device of the speed reducer shown in FIG.

[Explanation of symbols]

 2: Reduction gear 4: Reduction gear input shaft 6: Planetary gear type reduction gear mechanism 8: Reduction gear output shaft 12: Upper bearing 14: Lower bearing 20: Reduction gear main body 22: Upper casing 24: Ring gear 26: Lower casing 30: Impeller 32: Pump chamber 34: Discharge port 36: Communication passage 38: Lubricating oil passage pipe 40: Filter 42: Auxiliary pump 50: Hydraulic motor 224: Lubricating oil inlet

Claims (2)

[Scope of utility model registration request] 1. A speed reducer main body for accommodating an input shaft connected to a drive source in an upper portion, a reduction gear mechanism arranged in the main body and connected to the input shaft, and a lower portion of the main body connected to the reduction gear mechanism. In a lubricating oil circulation device for a speed reducer having an output shaft rotatably supported by a bearing, an output shaft below the bearing is equipped with an impeller that rotates integrally with the output shaft, and the impeller and the main body A pump chamber is formed by, the discharge port of the pump chamber and a lubricating oil inlet provided on the upper portion of the main body are connected by a lubricating oil flow pipe, and a filter is arranged in the lubricating oil flow pipe. Lubricating oil circulation device for speed reducers. 2. The lubricating oil circulating device for a speed reducer according to claim 1, wherein an auxiliary pump is arranged in the lubricating oil flow pipe.