Rotary oil return structure and gear box

Abstract

The utility model belongs to the technical field of gearbox sealing, and discloses a rotary oil return structure and a gearbox, in the rotary oil return structure, an oil inlet of a first oil return part is communicated with a first oil return cavity, an oil inlet of a second oil return part is communicated with a second oil return cavity, and an oil outlet of the first oil return part and an oil outlet of the second oil return part are both communicated with the interior of the gearbox. The rotating shaft penetrates through the first oil return cavity, and oil in the first oil return cavity and the second oil return cavity can return into the gearbox in the first oil return part and the second oil return part under the action of rotating centrifugal force of the rotating shaft. An oil inlet of the first oil return part and an oil inlet of the second oil return part are located on the two axial sides of the bearing correspondingly. Oil in the first oil return cavity can enter the second oil return cavity after passing through the bearing, and the sealing piece is used for sealing the second oil return cavity. Rotating centrifugal force of the rotating shaft can be effectively utilized, oil return capacity of lubricating oil is accelerated, so that the gear box can operate for a long time, and sealing reliability of the gear box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gearbox sealing, in particular to a rotating oil return structure and a gearbox. Background Art

[0002] During the operation of the gearbox, due to the downward inclination of the shafting, the oil inside it will accumulate continuously from the gap at the center of the sun gear towards the center of the rotating shaft, affecting the sealing performance of the rotating shaft. Under the influence of the height difference of the internal components, the sealing measures for the rotating shaft need to meet extremely strict requirements. Therefore, how to effectively utilize the rotational centrifugal force of the rotating shaft to accelerate the oil return ability of the lubricating oil, so that the gearbox can operate for a long time and improve its sealing reliability is a problem that needs to be solved by those skilled in the art at present. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a rotating oil return structure and a gearbox, so as to effectively utilize the rotational centrifugal force of the rotating shaft to accelerate the oil return ability of the lubricating oil, so that the gearbox can operate for a long time and improve its sealing reliability.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A rotating oil return structure for a gearbox, including:

[0006] A first oil return part and a second oil return part. The oil inlet of the first oil return part is communicated with a first oil return cavity, the oil inlet of the second oil return part is communicated with a second oil return cavity, and the oil outlets of the first oil return part and the second oil return part are both communicated with the inside of the gearbox. The rotating shaft passes through the first oil return cavity. The oil in the first oil return cavity and the second oil return cavity can return to the inside of the gearbox in the first oil return part and the second oil return part respectively under the action of the rotational centrifugal force of the rotating shaft;

[0007] The oil inlets of the first oil return part and the second oil return part are respectively located on both sides of the axial direction of the bearing, and the oil in the first oil return cavity can enter the second oil return cavity after passing through the bearing;

[0008] A seal for sealing the second oil return cavity.

[0009] Optionally, a connecting shaft is sleeved outside the rotating shaft, and an annular cavity is provided between the inner wall of the connecting shaft and the outer wall of the rotating shaft. Both ends of the annular cavity are respectively communicated with the inside of the gearbox and the first oil return cavity, and the oil in the gearbox can be transported to the first oil return cavity through the annular cavity.

[0010] Optionally, the first oil return part includes a first oil return hole and a first oil return channel. The first oil return hole communicates with the first oil return cavity and the first oil return channel, and the other end of the first oil return channel communicates with the inside of the gearbox.

[0011] Optionally, the first oil return hole is a straight hole arranged radially along the rotating shaft, and the first oil return channel is inclined axially along the rotating shaft.

[0012] Optionally, the second oil return part includes a second oil return hole and a second oil return channel. The second oil return hole communicates with the second oil return cavity and the second oil return channel, and the other end of the second oil return channel communicates with the inside of the gearbox.

[0013] Optionally, the second oil return hole is a straight hole arranged radially along the rotating shaft, and the second oil return channel is inclined axially along the rotating shaft.

[0014] Optionally, a plurality of the first oil return parts and the second oil return parts are provided.

[0015] Optionally, a baffle is provided on the bearing to block part of the oil from entering the second oil return cavity.

[0016] Optionally, the seal is set as a patch oil seal.

[0017] On the other hand, a gearbox includes the rotating oil return structure, a rotating shaft and a connecting shaft. The connecting shaft is sleeved outside the rotating shaft, and the first oil return cavity is located between the connecting shaft and the bearing.

[0018] Advantages of the present utility model:

[0019] In the present utility model, through the arrangement of the first oil return part and the second oil return part, the oil in the first oil return cavity and the second oil return cavity can be timely returned to the inside of the gearbox, thereby improving the oil return efficiency. Further, the oil can be returned under the action of the rotating centrifugal force, which can effectively improve the oil discharge effect, and the higher the rotation speed, the better the oil return effect. Optionally, the oil inlet of the first oil return part and the oil inlet of the second oil return part are respectively located on both sides of the bearing, and the oil in the first oil return cavity can enter the second oil return cavity after passing through the bearing. Thus, under the action of the first oil return part and the second oil return part, it can be effectively ensured that all the oil can be collected and returned. The seal seals the second oil return cavity, so that the oil will not leak out, thereby ensuring the sealing effect of the whole device and effectively collecting the oil. Description of the drawings

[0020] Figure 1 is a schematic structural diagram of the rotating oil return structure described in the embodiment of the present utility model;

[0021] Figure 2It is a cross-sectional schematic diagram of the rotating oil return structure described in the embodiment of the present utility model;

[0022] Figure 3 is Figure 2 a partially enlarged schematic diagram in

[0023] Figure 4 It is another cross-sectional schematic diagram of the rotating oil return structure described in the embodiment of the present utility model.

[0024] In the figure:

[0025] 100 - rotating shaft; 200 - connecting shaft; 300 - first oil return cavity; 20 - bearing; 30 - seal; 101 - annular cavity; 11 - first oil return part; 111 - first oil return hole; 112 - first oil return channel; 12 - second oil return part; 121 - second oil return hole; 122 - second oil return channel; 21 - baffle; 301 - second oil return cavity. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the description of the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0029] During the operation of the gearbox, due to the downward inclination of the shafting, the oil inside it will accumulate continuously from the gap at the center of the sun gear towards the center of the rotating shaft, affecting the sealing performance of the rotating shaft. Under the influence of the height difference of the internal components, extremely strict requirements need to be met for the sealing measures of the rotating shaft. Therefore, how to effectively utilize the rotational centrifugal force of the rotating shaft to accelerate the oil return capacity of the lubricating oil so that the gearbox can operate for a long time and improve its sealing reliability is a problem that needs to be solved by those skilled in the art at present.

[0030] The technical solution of this embodiment will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0031] As Figures 1 - 4 shown, this embodiment provides a rotational oil return structure for a gearbox, including a first oil return part 11, a second oil return part 12 and a seal 30. The oil inlet of the first oil return part 11 communicates with the first oil return cavity 300, the oil inlet of the second oil return part 12 communicates with the second oil return cavity 301, and the oil outlets of both the first oil return part 11 and the second oil return part 12 communicate with the inside of the gearbox. The rotating shaft 100 passes through the first oil return cavity 300. The oil in the first oil return cavity 300 and the second oil return cavity 301 can return oil to the inside of the gearbox in the first oil return part 11 and the second oil return part 12 respectively under the action of the rotational centrifugal force of the rotating shaft 100. The oil inlets of the first oil return part 11 and the second oil return part 12 are respectively located on both sides of the axial direction of the bearing 20. The oil in the first oil return cavity 300 can enter the second oil return cavity 301 after passing through the bearing 20. The seal 30 is used to seal the second oil return cavity 301.

[0032] On the other hand, the gearbox includes a rotational oil return structure, a rotating shaft 100 and a connecting shaft 200. The connecting shaft 200 is sleeved outside the rotating shaft 100, and the first oil return cavity 300 is located between the connecting shaft 200 and the bearing 20.

[0033] Specifically, in this embodiment, through the settings of the first oil return part 11 and the second oil return part 12, the oil in the first oil return cavity 300 and the second oil return cavity 301 can be returned to the inside of the gearbox in time, thereby improving the oil return efficiency. Further, the oil can return oil under the action of the rotational centrifugal force, which can effectively improve the oil discharge effect, and the higher the rotational speed, the better the oil return effect. Optionally, the oil inlets of the first oil return part 11 and the second oil return part 12 are respectively located on both sides of the bearing 20, and the oil in the first oil return cavity 300 can enter the second oil return cavity 301 after passing through the bearing 20. Thus, under the action of the first oil return part 11 and the second oil return part 12, it can be effectively ensured that all the oil can be collected and returned. The seal 30 seals the second oil return cavity 301 so that the oil will not leak out, thereby ensuring the sealing effect of the whole device and effectively collecting the oil.

[0034] The specific structure of the rotating oil return structure in this embodiment will be described below.

[0035] As Figure 1 and Figure 2 shown, the rotating oil return structure in this embodiment includes a first oil return portion 11, a second oil return portion 12, and a seal 30. Optionally, the rotating oil return structure is used at the rotating shaft 100 in the gearbox and can recover oil under the action of the rotational centrifugal force of the rotating shaft 100, ensuring the sealing performance and reliability of the gearbox so that it can operate for a long time. Exemplarily, one end of the rotating shaft 100 is connected to the inside of the gearbox, and a connecting shaft 200 is sleeved on the outside. The rotating shaft 100 also passes through the first oil return cavity 300. The first oil return cavity 300 is arranged as an annular first oil return cavity for storing and placing oil. Exemplarily, an annular cavity 101 is arranged between the inner wall of the connecting shaft 200 and the outer wall of the rotating shaft 100 in this embodiment. Both ends of the annular cavity 101 are respectively communicated with the inside of the gearbox and the first oil return cavity 300. Thus, the oil inside the gearbox can be transported to the first oil return cavity 300 under the action of the annular cavity 101 to achieve the effect of oil collection. Further, both the first oil return portion 11 and the second oil return portion 12 are provided with an oil inlet and an oil outlet. The oil inlet of the first oil return portion 11 is communicated with the wall body 300, and the oil inlet of the second oil return portion 12 is communicated with the second oil return cavity 301. Further, the oil outlets of the first oil return portion 11 and the second oil return portion 12 are both communicated with the inside of the gearbox, thereby realizing a complete path for the oil to return to the inside of the gearbox. Specifically, the oil in the first oil return cavity 300 and the second oil return cavity 301 can return to the inside of the gearbox in the first oil return portion 11 and the second oil return portion 12 respectively under the action of the rotational centrifugal force of the rotating shaft 100, thereby achieving the effect of oil return, avoiding the continuous flow of oil in the second oil return cavity 301, and the oil return efficiency is higher and the effect is better by using its own centrifugal force, and the oil return process is simplified.

[0036] Further, a bearing 20 is provided on the side of the first oil return cavity 300 facing away from the connecting shaft 200, that is, the first oil return cavity 300 is located between the connecting shaft 200 and the bearing 20, and the second oil return cavity 301 is located on the side of the bearing 20 facing away from the first oil return cavity 300. In this embodiment, the oil in the first oil return cavity 300 will enter the second oil return cavity 301 after passing through the bearing 20. In the prior art, the oil will leak from the other end of the second oil return cavity 301, resulting in the problem of oil leakage. In this embodiment, the oil inlet of the first oil return part 11 and the oil inlet of the second oil return part 12 are respectively located on both sides of the axial direction of the bearing 20, so that the oil in the first oil return cavity 300 that has not entered the bearing 20 can be subjected to oil return treatment through the first oil return part 11, and the oil that has entered the second oil return cavity 301 after passing through the bearing 20 can be subjected to oil return treatment through the second oil return part 12, thereby improving the oil return efficiency. Further, in this embodiment, the seal 30 is used to seal the second oil return cavity 301. Thus, the oil that enters the second oil return cavity 301 but does not enter the second oil return part 12 will be blocked in the second oil return cavity 301 by the seal 30 and will not have the problem of oil leakage as in the prior art. Then, under the continuous rotation of the rotating shaft 100, the oil return is realized again through the second oil return part 12, thereby ensuring that there is no oil leakage problem in the whole device and enabling the oil to be quickly subjected to oil return treatment.

[0037] As Figure 2 and Figure 4 shown, in this embodiment, the first oil return part 11 includes a first oil return hole 111 and a first oil return channel 112, and the second oil return part 12 includes a second oil return hole 121 and a second oil return channel 122. Optionally, in this embodiment, the oil inlet of the first oil return part 11 is arranged on the first oil return hole 111, the oil outlet is arranged on the first oil return channel 112, and the first oil return hole 111 communicates with the first oil return cavity 300 and the first oil return channel 112. The other end of the first oil return channel 112 communicates with the inside of the gearbox. Thus, the oil at the first oil return cavity 300 can return to the inside of the gearbox through the first oil return hole 111 and the first oil return channel 112. Optionally, the first oil return hole 111 is a straight hole arranged radially along the rotating shaft 100, the first oil return channel 112 is inclined along the axial direction of the rotating shaft 100, and the distance between the first oil return channel 112 and the rotating shaft 100 gradually increases in the direction from the first oil return cavity 300 to the connecting shaft 200, so as to facilitate the rapid oil return of the oil from the first oil return channel 112 to the inside of the gearbox during the rotation of the rotating shaft 100. Exemplarily, in this embodiment, the first oil return hole 111 is arranged in a penetrating manner, the first oil return channel 112 communicates with the upper middle part of the first oil return hole 111, and its outside is blocked by other plugs to avoid oil leakage.

[0038] Accordingly, in this embodiment, the oil inlet of the second oil return part 12 is arranged on the second oil return hole 121, the oil outlet is arranged on the second oil return passage 122, and the second oil return hole 121 communicates with the second oil return cavity 301 and the second oil return passage 122. The other end of the second oil return passage 122 communicates with the inside of the gearbox. Thus, the oil remaining in the second oil return cavity 301 can return to the inside of the gearbox through the second oil return hole 121 and the second oil return passage 122. Optionally, the second oil return hole 121 is a straight hole arranged radially along the rotating shaft 100, the second oil return passage 122 is inclined axially along the rotating shaft 100, and the distance between the second oil return passage 122 and the rotating shaft 100 gradually increases in the direction from the first oil return cavity 300 to the connecting shaft 200, so as to facilitate the rapid return of the oil to the inside of the gearbox through the second oil return passage 122 during the rotation of the rotating shaft 100. Exemplarily, in this embodiment, the second oil return hole 121 is arranged in a penetrating manner, the second oil return passage 122 communicates with the upper middle part of the second oil return hole 121, and its outside is blocked by other plugs to prevent oil leakage.

[0039] Optionally, in this embodiment, a plurality of first oil return parts 11 and second oil return parts 12 are provided, and the first oil return parts 11 and the second oil return parts 12 are arranged at intervals, thereby achieving the effect of multi-channel oil return. As Figure 3 shown, in this embodiment, a baffle 21 is arranged on the bearing 20 to block part of the oil from entering the second oil return cavity 301, so that most of the oil can be blocked in front of the baffle 21, and then the oil returns through the first oil return part 11 under the action of centrifugal force. A small amount of oil enters the second oil return cavity 301 through the bearing 20 and can be returned by the second oil return part 12. Exemplarily, in this embodiment, the seal 30 is set as a patch oil seal, so as to block the oil or oil mist in the second oil return cavity 301 to ensure the sealing effect of the rotating oil return structure and prevent oil leakage. In other embodiments, the seal 30 can also be made of rubber material or felt and other materials to improve the wear resistance of the oil seal.

[0040] On the other hand, in this embodiment, the gearbox includes the above-mentioned rotating oil return structure, rotating shaft 100, connecting shaft 200 and first oil return cavity 300, and the connecting shaft 200 is sleeved outside the rotating shaft 100. The rotating shaft 100 penetrates through the first oil return cavity 300, and one end of the rotating shaft 100 is connected to the inside of the gearbox. Thus, the oil inside the gearbox can be conveyed between the rotating shaft 100 and the connecting shaft 200 to the first oil return cavity 300 and return to the inside of the gearbox in the rotating oil return structure under the action of rotating centrifugal force.

[0041] Thus, through the annular cavity 101 between the rotating shaft 100 and the connecting shaft 200, the oil can be converged onto the rotating shaft 100 until it enters the first oil return cavity 300. Then, under the action of the centrifugal force during its continuous rotation, the oil flows back into the gearbox along the oil return system, improving the oil drainage effect. Moreover, the higher the rotational speed, the more obvious the oil return effect.

[0042] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Rotary oil return structure, used for gear box, characterized in that: include: A first oil return portion (11) and a second oil return portion (12), wherein an oil inlet of the first oil return portion (11) is connected to a first oil return chamber (300), an oil inlet of the second oil return portion (12) is connected to a second oil return chamber (301), and an oil outlet of the first oil return portion (11) and an oil outlet of the second oil return portion (12) are both connected to the interior of a gearbox, a rotating shaft (100) is arranged to pass through the first oil return chamber (300), and oil in the first oil return chamber (300) and the second oil return chamber (301) can be returned to the interior of the gearbox from the first oil return portion (11) and the second oil return portion (12) respectively under the action of the centrifugal force of the rotating shaft (100); The oil inlet of the first oil return portion (11) and the oil inlet of the second oil return portion (12) are respectively located on both sides of the axial direction of the bearing (20), and the oil in the first oil return chamber (300) can enter the second oil return chamber (301) after passing through the bearing (20); A sealing member (30), wherein the sealing member (30) is used to seal the second oil return chamber (301).

2. The rotary oil return structure according to claim 1, characterized in that: A connecting shaft (200) is sleeved on the outer side of the rotating shaft (100), and an annular cavity (101) is provided between the inner wall of the connecting shaft (200) and the outer wall of the rotating shaft (100), and two ends of the annular cavity (101) are respectively connected to the interior of the gear box and the first oil return cavity (300), and the oil inside the gear box can be transported to the first oil return cavity (300) through the annular cavity (101).

3. The rotary oil return structure according to claim 1, characterized in that: The first oil return portion (11) comprises a first oil return hole (111) and a first oil return channel (112); the first oil return hole (111) is connected to the first oil return chamber (300) and the first oil return channel (112); the other end of the first oil return channel (112) is connected to the interior of the gear box.

4. The rotary oil return structure according to claim 3, characterized in that: The first oil return hole (111) is a straight hole arranged radially along the rotating shaft (100), and the first oil return channel (112) is inclined axially along the rotating shaft (100).

5. The rotary oil return structure according to claim 1, characterized in that: The second oil return portion (12) comprises a second oil return hole (121) and a second oil return channel (122); the second oil return hole (121) is connected to the second oil return chamber (301) and the second oil return channel (122); the other end of the second oil return channel (122) is connected to the interior of the gear box.

6. The rotary oil return structure according to claim 5, characterized in that: The second oil return hole (121) is a straight hole arranged radially along the rotating shaft (100), and the second oil return channel (122) is inclined axially along the rotating shaft (100).

7. The rotary oil return structure according to claim 1, characterized in that: A plurality of the first oil return parts (11) and the second oil return parts (12) are provided.

8. The rotary oil return structure according to claim 1, characterized in that: The bearing (20) is provided with a baffle (21) for blocking part of the oil from entering the second oil return chamber (301).

9. The rotary oil return structure according to claim 1, characterized in that: The sealing element (30) is configured as a patch oil seal.

10. Gear box, characterized in that, It comprises a rotating oil return structure as described in any one of claims 1 to 9, a rotating shaft (100) and a connecting shaft (200), wherein the connecting shaft (200) is sleeved on the outside of the rotating shaft (100), and the first oil return chamber (300) is located between the connecting shaft (200) and the bearing (20).

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