Bearing lubricating structure of speed reducer output shaft

Abstract

The utility model provides a bearing lubrication structure of a speed reducer output shaft, which relates to the technical field of bearing lubrication, and comprises a speed reducer shell, an oil supply pipe and an oil spray pipe, the speed reducer shell is provided with a bearing installation part for fixing a bearing; a through hole is formed in the side wall of the bearing mounting part; the oil supply pipe is fixed on the outer wall of the bearing mounting part and is communicated with the outer end of the through hole; the oil spraying pipe is fixed in the oil spraying pipe containing cavity, an oil inlet of the oil spraying pipe communicates with the inner end of the through hole, and an oil spraying opening of the oil spraying pipe faces the bearing containing cavity; the through hole is formed in the side wall of the bearing mounting part, so that a channel for supplying oil to the interior of the bearing mounting part from the outside can be formed, the bearing is lubricated, oil pressure is concentrated in the bearing mounting part and cannot be concentrated between the bearing mounting part and the annular sealing cover, oil leakage cannot occur even if the oil pressure is properly increased, and the service life of the bearing is prolonged. Therefore, the problem of oil leakage between the bearing mounting part and the annular sealing cover in a traditional sealing structure is solved.

Description

Technical Field

[0001] This utility model relates to the field of bearing lubrication technology, and in particular to a bearing lubrication structure for the output shaft of a speed reducer. Background Technology

[0002] Medium-speed coal mills are important auxiliary equipment in pulverized coal boilers of thermal power plants, their function being to grind coal lumps into pulverized coal. A medium-speed coal mill includes a reducer, the reducer housing of which has a bearing mounting section. A bearing is installed in the bearing mounting section, and the output shaft of the reducer is sleeved within the bearing. The bearing mounting section is fixedly connected to an annular sealing disc.

[0003] During operation, the reducer requires lubrication of its output shaft. The bearing mounting section has an annular oil supply groove with four spray nozzles. Lubricating oil enters the annular oil supply groove through a distributor and is then sprayed out from the four nozzles to cool and lubricate the bearing. The input lubricating oil pressure is typically 0.05 MPa. However, the small diameter of the annular oil supply groove can obstruct flow, causing lubricating oil to leak from the gap between the bearing mounting section and the annular seal. This leakage seriously affects the safe and stable operation of the coal mill and causes environmental pollution, while also increasing the workload of maintenance personnel and wasting spare parts. Lowering the oil pressure, on the other hand, can lead to inadequate lubrication of the bearing, damaging it and further increasing the workload of maintenance personnel and wasting spare parts.

[0004] To address this issue, a bearing lubrication structure for the output shaft of a speed reducer is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a bearing lubrication structure for the output shaft of a speed reducer, so as to solve the problems existing in the prior art and ensure effective lubrication of the bearing while avoiding oil leakage.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A bearing lubrication structure for a speed reducer output shaft includes a speed reducer housing, an oil supply pipe, and an oil injection pipe. The speed reducer housing has a bearing mounting portion for fixing the bearing. The bearing mounting portion has a bearing receiving cavity and an oil injection pipe receiving cavity connected inside, with the oil injection pipe receiving cavity located closer to the bearing mounting portion than the bearing receiving cavity. A through hole is provided on the side wall of the bearing mounting portion, connecting the oil injection pipe receiving cavity and the outside of the bearing mounting portion. The oil supply pipe is fixed to the outer wall of the bearing mounting portion and communicates with the outer end of the through hole. The oil injection pipe is fixed inside the oil injection pipe receiving cavity, with the oil inlet of the oil injection pipe communicating with the inner end of the through hole. The oil injection nozzle of the oil injection pipe faces the position communicating with the oil injection pipe receiving cavity, for spraying oil to lubricate the bearing.

[0008] In one embodiment, the through hole is provided radially along the bearing mounting portion.

[0009] In one embodiment, the through hole is located at the top of the bearing mounting portion.

[0010] As one embodiment, the fuel injection pipe has two fuel injection ports, which are symmetrically arranged with respect to the axis of the through hole.

[0011] As one embodiment, the included angle between the injection directions of the two injection nozzles is 90° to 150°.

[0012] As one embodiment, the included angle between the injection directions of the two injection nozzles is 120°.

[0013] As one embodiment, the fuel injection pipe is welded to the inner wall of the bearing mounting portion.

[0014] As one embodiment, the fuel injection pipe is threaded to the inner end of the through hole.

[0015] In one embodiment, the oil supply pipe is connected to the outer end of the through hole via a connector assembly.

[0016] In one embodiment, the connector assembly includes a connector body, a spacer, and a nut. One end of the connector body is threaded to the outer end of the through hole, and the other end has a spherical structure. The end of the oil supply pipe has a flared structure, which abuts against the spherical structure. The spacer is sleeved on the outside of the oil supply pipe and pressed onto the flared structure. The nut is sleeved on the outside of the oil supply pipe and threaded to the other end of the connector body, pressing the spacer and the flared structure tightly against the other end of the connector body.

[0017] This utility model has the following technical advantages over the prior art:

[0018] This invention creates a channel for oil supply from the outside to the inside of the bearing mounting section by opening a through hole in the side wall of the bearing mounting section. An oil injection pipe is connected to the inner end of the through hole, and an oil supply pipe is connected to the outer end of the through hole, thus achieving bearing lubrication. Furthermore, the through hole in the side wall of the bearing mounting section concentrates the oil pressure inside the bearing mounting section, preventing it from concentrating between the bearing mounting section and the annular seal. Even with a slight increase in oil pressure, leakage will not occur, thereby solving the problem of oil leakage between the bearing mounting section and the annular seal in traditional sealing structures. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the bearing lubrication structure of the reducer output shaft in one embodiment of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of the side section structure.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Bearing mounting section; 2. Bearing; 3. Through hole; 4. Oil supply pipe; 5. Oil injection pipe; 6. Connector assembly. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The purpose of this invention is to provide a bearing lubrication structure for the output shaft of a speed reducer, so as to solve the problems existing in the prior art, and to ensure effective lubrication of the bearing while avoiding oil leakage.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , Figure 2As shown, this embodiment provides a bearing lubrication structure for the output shaft of a speed reducer, including a speed reducer housing, an oil supply pipe 4, and an oil injection pipe 5. The speed reducer housing has a bearing mounting part 1, which is typically a cylindrical structure with a mounting hole for mounting a bearing 2. The cavity within the mounting hole can be divided into a bearing 2 receiving cavity and an oil supply pipe 4 receiving cavity, with the oil supply pipe 4 receiving cavity located outside the bearing 2 receiving cavity. The bearing 2 is fixed inside the bearing 2 receiving cavity, and the output shaft of the speed reducer is fixed to the inner ring of the bearing 2. A through hole 3 is provided on the side wall of the bearing mounting part 1, connecting the oil supply pipe 4 receiving cavity to the outside of the bearing mounting part 1. This through hole 3 serves as a channel for the flow of lubricating oil. The oil supply pipe 4 is fixed on the outer wall of the bearing mounting part 1 and is connected to the outer end of the through hole 3; the oil injection pipe 5 is fixed on the inner wall of the bearing mounting part 1 and is located in the oil injection pipe 5 receiving cavity. The oil inlet of the oil injection pipe 5 is connected to the inner end of the through hole 3. The oil injection port of the oil injection pipe 5 faces the bearing 2 receiving cavity. After the bearing 2 is installed in the bearing 2 receiving cavity, the oil injection port faces the bearing 2.

[0028] In use, the oil supply pipe 4 is connected to the hydraulic oil tank through the oil pump. The oil pump pumps the hydraulic oil into the oil supply pipe 4, and then into the oil injection pipe 5 through the through hole 3. Finally, the oil is sprayed from the oil injection port of the oil injection pipe 5 onto the bearing 2 to lubricate the bearing 2.

[0029] This embodiment creates a channel for supplying oil from the outside to the inside of the bearing mounting part 1 by opening a through hole 3 on the side wall of the bearing mounting part 1, and connecting an oil injection pipe 5 to the inner end of the through hole 3 and an oil supply pipe 4 to the outer end of the through hole 3, thus achieving lubrication of the bearing 2. Moreover, by opening a through hole 3 on the side wall of the bearing mounting part 1, the oil pressure is concentrated inside the bearing mounting part 1 and will not be concentrated between the bearing mounting part 1 and the annular sealing cover. Even if the oil pressure is appropriately increased, there will be no oil leakage, thereby solving the problem of oil leakage between the bearing mounting part 1 and the annular sealing cover in traditional sealing structures.

[0030] To facilitate the installation of the through hole 3, in this embodiment, the through hole 3 is arranged radially along the bearing mounting part 1. It can be obtained by drilling a hole with an electric drill on the side wall of the bearing mounting part 1, and its diameter can be 10mm. Then, the through hole 3 is tapped to form an internal thread. The specific diameter of the through hole 3 can be set according to the actual oil supply requirements.

[0031] The mounting holes of the bearing mounting part 1 can be set vertically or horizontally. For example, in the reducer used in the ZQM158 medium-speed coal mill, the mounting holes are set horizontally with the openings facing upwards. In this case, the through hole 3 can be located at any position on the bearing mounting part 1, as long as the oil supply pipe 4 is easy to install. When the mounting holes are set vertically with the openings facing horizontally, the through hole 3 is located at the top of the bearing 2 mounting seat.

[0032] To increase the fuel injection coverage area of ​​the fuel injection pipe 5, in this embodiment, the fuel injection pipe 5 has two fuel injection nozzles, which are symmetrically arranged with respect to the axis of the through hole 3. The included angle of the fuel injection direction of the two fuel injection nozzles is 90° to 150°, specifically, the included angle of the fuel injection direction of the two fuel injection nozzles is 120°.

[0033] In one embodiment, the fuel injection pipe 5 is welded to the inner wall of the bearing mounting part 1.

[0034] In another embodiment, the fuel injection pipe 5 is threaded to the inner end of the through hole 3 to achieve a detachable connection between the fuel injection pipe 5 and the bearing mounting part 1.

[0035] In one embodiment, the oil supply pipe 4 is connected to the outer end of the through hole 3 via a connector assembly 6. The connector assembly 6 includes a connector body, a spacer, and a nut. One end of the connector body is threaded to the outer end of the through hole 3, and the other end has a spherical structure. The end of the oil supply pipe 4 has a flared structure (flared mouth structure), the diameter of which abuts against the spherical structure. The spacer is sleeved on the outside of the oil supply pipe 4 and pressed onto the flared structure. The nut is sleeved on the outside of the oil supply pipe 4 and threaded to the other end of the connector body, pressing the spacer and the flared structure tightly against the other end of the connector body. The connector body, spacer, and nut can use existing devices; their specific structures will not be described in detail in this embodiment.

[0036] For the reducer used in the traditional ZQM158 medium-speed coal mill, the bearing lubrication structure in this embodiment can be achieved through modification. Specifically, the oil supply port in the annular oil supply groove of the traditional reducer is sealed with screws. The sealing method can be welding or tapping the oil supply port and then threading it. Then, a through hole 3 is drilled from the side wall of the bearing mounting part 1, penetrating the side wall of the bearing mounting part 1. Threads are tapped inside the through hole 3. Finally, the oil supply pipe 4 and the oil injection pipe 5 are connected.

[0037] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A bearing lubrication structure for the output shaft of a speed reducer, characterized in that, include: A speed reducer housing has a bearing mounting portion for fixing a bearing; the bearing mounting portion has a bearing receiving cavity and an oil injection pipe receiving cavity connected inside, the oil injection pipe receiving cavity being closer to the end of the bearing mounting portion than the bearing receiving cavity; a through hole is provided on the side wall of the bearing mounting portion, connecting the oil injection pipe receiving cavity and the outside of the bearing mounting portion; An oil supply pipe is fixed on the outer wall of the bearing mounting part and communicates with the outer end of the through hole; And an oil injection pipe, the oil injection pipe being fixed inside the oil injection pipe receiving cavity, the oil inlet of the oil injection pipe being connected to the inner end of the through hole, and the oil injection port of the oil injection pipe being oriented towards the position where the bearing receiving cavity and the oil injection pipe receiving cavity are connected, for spraying oil to lubricate the bearing.

2. The bearing lubrication structure for the output shaft of the reducer according to claim 1, characterized in that, The through hole is arranged radially along the bearing mounting portion.

3. The bearing lubrication structure for the output shaft of the reducer according to claim 2, characterized in that, The through hole is located at the top of the bearing mounting portion.

4. The bearing lubrication structure for the output shaft of the reducer according to claim 3, characterized in that, The fuel injection pipe has two fuel injection ports, which are symmetrically arranged with respect to the axis of the through hole.

5. The bearing lubrication structure for the output shaft of the reducer according to claim 4, characterized in that, The included angle between the injection directions of the two injection nozzles is 90° to 150°.

6. The bearing lubrication structure for the output shaft of the reducer according to claim 5, characterized in that, The angle between the injection directions of the two injection nozzles is 120°.

7. The bearing lubrication structure for the output shaft of the reducer according to claim 1, characterized in that, The fuel injection pipe is welded to the inner wall of the bearing mounting part.

8. The bearing lubrication structure for the output shaft of the reducer according to claim 1, characterized in that, The fuel injection pipe is threaded to the inner end of the through hole.

9. The bearing lubrication structure for the output shaft of the reducer according to claim 1, characterized in that, The oil supply pipe is connected to the outer end of the through hole via a connector assembly.

10. The bearing lubrication structure for the output shaft of the reducer according to claim 9, characterized in that, The connector assembly includes a connector body, a spacer, and a nut. One end of the connector body is threaded to the outer end of the through hole, and the other end has a spherical structure. The end of the oil supply pipe has a flared structure, which abuts against the spherical structure. The spacer is sleeved on the outside of the oil supply pipe and pressed onto the flared structure. The nut is sleeved on the outside of the oil supply pipe and threaded to the other end of the connector body, pressing the spacer and the flared structure tightly against the other end of the connector body.

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