Self-lubricating gear and transmission structure

Abstract

The self-lubricating gear and transmission structure comprises a main body disc and a gear ring, and a transmission shaft assembly hole is formed in the center of the main body disc; a plurality of oil storage cavities are formed in the main body disc and are of an annular arrangement structure around the transmission shaft assembly hole, a first flow channel is formed between the oil storage cavities and the gear ring, and a second flow channel is formed between the oil storage cavities and the transmission shaft assembly hole; a one-way valve I is mounted between the runner I and the oil storage cavity; the self-lubricating gear has the advantages that the self-lubricating function is achieved, and oil leakage during shutdown is prevented; the multiple oil storage cavities are formed in the gear body, the first flow channels are formed between the oil storage cavities and the gear ring, and directional conveying of lubricating oil is achieved by combining the control effect of the one-way valve; the second flow channel is arranged between the gear and the transmission shaft and matched with the one-way valve, so that lubricating oil can be directly injected into the oil storage cavities through a centralized oil supply system in the transmission shaft, and the tedious operation that oil needs to be injected into each oil storage cavity independently in a traditional mode is avoided.

Description

Technical Field

[0001] This utility model relates to the field of transmission component manufacturing, and in particular to a self-lubricating gear and transmission structure. Background Technology

[0002] A gear is a mechanical component with teeth on its rim, capable of transmitting motion and power through continuous meshing. It is a key transmission component widely used in various types of mechanical equipment. During meshing, gears generate impact noise corresponding to the meshing frequency; simultaneously, the relative sliding between the tooth surfaces also induces friction noise. These noises not only increase the noise level of the equipment during operation but may also accelerate gear wear, thereby shortening its service life.

[0003] By injecting lubricating oil into the gear meshing area, wear and noise can be reduced. For example, patents 202122987984.5 and 202120955989.7 both propose self-lubricating gear structures. By opening an oil storage chamber in the gear and setting a flow channel connecting the teeth and the oil storage chamber, the lubricating oil in the oil storage chamber is transported to the meshing area by centrifugal force when the gear rotates, thus achieving self-lubrication.

[0004] However, the above structure has the following drawbacks:

[0005] 1. No valve mechanism is installed at the oil storage chamber and the flow channel. When the gear is installed vertically, the lubricating oil in the oil storage chamber can also flow out along the flow channel under its own weight. This causes the lubricating oil stored in the gear to continuously flow out when the equipment stops running, resulting in the oil storage chamber being unable to maintain the oil level and requiring frequent refilling.

[0006] 2. Gears typically have multiple annularly distributed oil reservoirs inside to achieve center of gravity balance and uniform lubrication of the gear ring. Each oil reservoir is equipped with a cover plate for opening and closing. When adding oil, the cover plate must be opened and each reservoir must be filled one by one, which is cumbersome and inefficient.

[0007] Therefore, this case is brought. Utility Model Content

[0008] One of the objectives of this invention is to provide a self-lubricating gear to solve the aforementioned defects.

[0009] To achieve the above objectives, the technical solution of this utility model is as follows:

[0010] A self-lubricating gear includes a main disc and a gear ring integrally formed on the outer circumference of the main disc. A drive shaft mounting hole is formed at the center of the main disc. Multiple oil storage chambers are arranged in a ring around the drive shaft mounting hole. A flow channel one is provided between the oil storage chamber and the gear ring, and a flow channel two is provided between the oil storage chamber and the drive shaft mounting hole. A one-way valve one is installed between the flow channel one and the oil storage chamber, through which lubricating oil in the oil storage chamber can enter the flow channel one and be output to the gear ring. A one-way valve two is installed between the flow channel two and the oil storage chamber, through which lubricating oil entering the flow channel two can enter the oil storage chamber.

[0011] Furthermore, the one-way valve one and the one-way valve two have the same structure, both including a valve seat, a valve body, a spring and a steel ball;

[0012] The valve seat includes an integrally formed connecting part 1 and a screwing part 1. The connecting part 1 is a hollow external threaded column structure with open ends. The screwing part 1 is a hollow hexagonal column with open ends. The inner diameter of the connecting part 1 is larger than the inner diameter of the screwing part 1, and the outer diameter of the connecting part 1 is larger than the outer diameter of the screwing part 1.

[0013] The valve body sequentially includes an integrally formed connecting part two, a limiting part, and a screwing part two. The connecting part two is a hollow externally threaded column structure with open ends. The inner wall of the connecting part one is provided with internal threads. The connecting part two is inserted into the connecting part one and threadedly connected to the connecting part one. The inner diameter of the connecting part two is larger than the outer diameter of the steel ball, and the outer diameter of the steel ball is larger than the inner diameter of the screwing part one. The limiting part is a hollow cylindrical structure with open ends. Its outer diameter is smaller than the outer diameter of the connecting part one, and its inner diameter is smaller than the inner diameter of the connecting part two. The end face of the limiting part located on the inner side of the connecting part two forms a spring mounting surface. The steel ball moves in the hollow part of the connecting part two, and the spring abuts between the steel ball and the spring mounting surface. The screwing part two is a hollow hexagonal column with open ends. The inner diameter of the screwing part one, the inner diameter of the screwing part two, and the inner diameter of the limiting part are the same. The outer diameter of the screwing part two is smaller than the outer diameter of the limiting part.

[0014] The inner walls of the first and second flow channels near the oil storage chamber are threaded. The first check valve is threadedly connected to the first flow channel through the connecting part, and the second check valve is threadedly connected to the second flow channel through the connecting part.

[0015] Furthermore, the oil storage chambers are provided in six groups, divided into three groups: A, B, and C. Two oil storage chambers in the same group are symmetrically arranged and located in the same radial direction. The opening pressure of the one-way valve in the same group is the same, while the opening pressure of the one-way valve in different groups is different. The opening pressure of the one-way valve in group A is defined as F. A1 The opening pressure of check valve 1 in group B is F. B1 The opening pressure of check valve 1 in group C is F. C1 The opening pressure of all one-way valves is F2, and it satisfies F A1>F B1 >F C1 >F2.

[0016] Furthermore, the oil storage cavity is hemispherical, with the spherical surface facing the gear ring side, and the connection point between the flow channel and the oil storage cavity is located at the center of the spherical surface.

[0017] Furthermore, the diameter of the flow channel extending to one end of the gear ring is reduced to 1 / 3 of the diameter of the port near the oil storage cavity, and the opening on the side of the gear ring is located on the side wall of the gear ring teeth.

[0018] Furthermore, the surface of the gear ring is provided with a self-lubricating coating.

[0019] The second objective of this utility model is to provide a transmission structure, including a transmission shaft and the self-lubricating gear. The self-lubricating gear is fixed on the transmission shaft. The transmission shaft is provided with a main input oil passage and input branch oil passages corresponding to the oil storage chambers. The main input oil passage is arranged along the central axis of the transmission shaft, and the input branch oil passages are arranged radially along the transmission shaft. One end of the input branch oil passage is connected to the main input oil passage, and the other end of the input branch oil passage is directly opposite to and connected to the flow channel.

[0020] The advantages of this utility model are:

[0021] 1. Achieve self-lubrication and prevent oil leakage during shutdown: By setting multiple oil storage chambers inside the gear body and opening a flow channel between the oil storage chamber and the gear ring, combined with the control function of the one-way valve, the directional delivery of lubricating oil is realized. The one-way valve can automatically open under the centrifugal force generated by the gear rotation to ensure timely and effective lubrication; when the equipment stops running, the valve closes to prevent backflow or leakage of lubricating oil, thereby achieving a reliable self-lubricating function and reducing the frequency of manual maintenance.

[0022] 2. Setting up an oil replenishment channel to improve oil injection efficiency: A second flow channel is set up between the gear and the drive shaft, and a second check valve is used to allow lubricating oil to be directly injected into the oil storage chamber through the centralized oil supply system inside the drive shaft. This avoids the cumbersome operation of individually injecting oil into each oil storage chamber in the traditional method, which significantly improves the oiling efficiency, saves maintenance time, and enhances the operability and practicality of the system.

[0023] 3. Considering the differences in lubrication requirements of gears at different speeds (greater friction and higher lubrication requirements at high speeds), this application sets the opening pressure of multiple check valves in groups (e.g., FA1>FB1>FC1). This hierarchical control strategy ensures that only valves with lower pressure are opened at low speeds, while more valves are opened in stages under high-speed or high-load conditions, achieving on-demand oil supply and a dynamic response effect of "the higher the speed, the more oil is supplied," effectively ensuring good lubrication of gears under various operating conditions. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the self-lubricating gear in the embodiment;

[0025] Figure 2 for Figure 1 Enlarged diagram of part A in the diagram;

[0026] Figure 3 This is a front view schematic diagram of the one-way valve in the embodiment;

[0027] Figure 4 This is a cross-sectional view of the one-way valve in the embodiment.

[0028] Label Explanation

[0029] 1. Main disc; 101. Flow channel one; 102. Flow channel two; 103. Oil reservoir; 2. Gear ring; 3. Drive shaft; 301. Main input oil passage; 302. Branch input oil passage; 4. Check valve one; 401. Valve seat; 4011. Connecting part one; 4012. Tightening part one; 402. Valve body; 4021. Connecting part two; 4022. Limiting part; 4023. Tightening part two; 403. Steel ball; 404. Spring; 5. Check valve two. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the embodiments. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" etc. indicated by the coordinate system of the accompanying drawings are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] This embodiment proposes a transmission structure, such as Figures 1 to 4 As shown, the device includes a gear and a drive shaft 3. The gear includes a main body disk 1 and a gear ring 2 integrally formed on the outer circumference of the main body disk 1. A drive shaft mounting hole is opened at the center of the main body disk 1, and the drive shaft 3 is fixed to the gear through the drive shaft mounting hole. Six oil storage chambers 103 are provided inside the main body disk 1, and the six oil storage chambers 103 are evenly arranged in a ring around the drive shaft 3 mounting hole. A flow channel 101 is provided between the oil storage chambers 103 and the gear ring 2, and a flow channel 102 is provided between the oil storage chambers 103 and the drive shaft mounting hole. A one-way valve 4 is installed between the flow channel 101 and the oil storage chamber 103, and the lubricating oil in the oil storage chamber 103 can enter the flow channel 101 through the one-way valve 4 and be output to the gear ring 2. A one-way valve 5 is installed between the flow channel 102 and the oil storage chamber 103, and the lubricating oil entering the flow channel 102 can enter the oil storage chamber 103 through the one-way valve 5.

[0032] The drive shaft 3 is provided with a main input oil passage 301 and input branch oil passages 302 corresponding to the oil storage chamber 103. The main input oil passage 301 is arranged along the central axis of the drive shaft 3, and the input branch oil passages 302 are arranged radially along the drive shaft 3. One end of the input branch oil passage 302 is connected to the main input oil passage 301, and the other end of the input branch oil passage 302 is directly opposite to and connected to the flow channel 102. External lubricating oil can enter the input branch oil passage 302 through the main input oil passage 301, and then enter the oil storage chamber 103 through the check valve 5.

[0033] In this embodiment, the one-way valve 4 and the one-way valve 5 have the same structure, both including a valve seat 401, a valve body 402, a spring 404, and a steel ball 403, as shown below. Figures 3 to 4 As shown, the following description uses one-way valve 4 as an example.

[0034] The valve seat 401 includes an integrally formed connecting part 4011 and a screwing part 4012. The connecting part 4011 is a hollow external threaded column structure with open ends. The screwing part 4012 is a hollow hexagonal column with open ends. The inner diameter of the connecting part 4011 is larger than the inner diameter of the screwing part 4012, and the outer diameter of the connecting part 4011 is larger than the outer diameter of the screwing part 4012.

[0035] The valve housing 402 sequentially includes an integrally formed connecting part 4021, a limiting part 4022, and a screwing part 4023. The connecting part 4021 is a hollow, externally threaded cylindrical structure with open ends. The inner wall of the connecting part 4011 is provided with internal threads. The connecting part 4021 is inserted into the connecting part 4011 and threadedly connected to it. The inner diameter of the connecting part 4021 is larger than the outer diameter of the steel ball 403, and the outer diameter of the steel ball 403 is larger than the inner diameter of the screwing part 4012. The limiting part 4022 is a hollow cylindrical structure with open ends. Its outer diameter is smaller than the outer diameter of the connecting part 4011, and its inner diameter is smaller than the inner diameter of the connecting part 4021. The end face of the limiting part 4022 located outside the connecting part 4021 forms a limiting surface, which is used to limit the maximum extent to which the connecting part 4021 screws into the connecting part 4011. The end face of the limiting part 4022 located inside the connecting part 4021 forms a spring mounting surface. The steel ball 403 moves in the hollow part of the connecting part 4021. The spring 404 abuts between the steel ball 403 and the spring mounting surface. The second screwing part 4023 is a hollow hexagonal prism with open ends. The inner diameter of the first screwing part 4012, the inner diameter of the second screwing part 4023, and the inner diameter of the limiting part 4022 are the same. The outer diameter of the second screwing part 4023 is smaller than the outer diameter of the limiting part 4022. When the spring 404 presses the steel ball 403 against the end of the hollow cavity of the first screwing part 4012, the hollow cavity of the first screwing part 4012 is blocked, and the lubricating oil entering from the outside of the first screwing part 4012 cannot pass through the one-way valve 4; when the spring 404 is compressed under the action of external force, and the steel ball 403 leaves the end of the hollow cavity of the first screwing part 4012, the hollow cavity of the first screwing part 4012 is not blocked, and the lubricating oil entering from the outside of the first screwing part 4012 can enter the one-way valve, and pass through the hollow cavity of the second connecting part, the hollow cavity of the limiting part, and the hollow cavity of the second screwing part in sequence, until the output one-way valve 4.

[0036] The inner walls of flow channels 101 and 102 near the oil storage chamber 103 are threaded. One-way valve 4 is threaded into flow channel 101 via connecting part 4011, and one-way valve 5 is threaded into flow channel 102 via connecting part 4011. When installing one-way valve 4, it is screwed into flow channel 101 by tightening the tightening part 4012. Figure 2 As shown, when installing check valve 2 5, you can hold the outer wall of the connecting part 1 4011 and screw check valve 2 5 into it. According to the experiment, the threaded connection of this part is sufficient to install check valve 2 5 securely. If it is not secure enough, the connecting part 1 of check valve 2 can be welded to the flow channel 2 for fixation (but according to the current experiment, welding is not necessary).

[0037] In this embodiment, the opening pressure of check valve 4 and check valve 5 is adjustable (i.e., the steel ball 403 moves against the thrust of the spring 404 under external force). The adjustment process is to change the compression degree of the spring 404 by turning the screwing part 4023, thereby changing the opening pressure. Considering the difference in lubrication requirements of gears at different speeds (greater friction and higher lubrication requirements at high speeds), this application sets the opening pressure of multiple check valves 4 in groups. The oil storage chambers 103 are provided with six chambers, which are divided into three groups: A, B, and C. The two oil storage chambers 103 in the same group are symmetrically arranged and located on the same radial direction. The opening pressure of check valve 4 in the same group is the same, and the opening pressure of check valve 4 in different groups is different. The opening pressure of check valve 4 in group A is defined as FA1, the opening pressure of check valve 4 in group B is defined as FB1, and the opening pressure of check valve 4 in group C is defined as FC1. The opening pressure of all check valves 5 is F2, and the following conditions are met: FA1>FB1>FC1>F2. Based on this setup, the self-lubricating process of the gear is as follows.

[0038] Low-speed lubrication stage:

[0039] The drive shaft 3 drives the gear to rotate at a low speed. At this time, the centrifugal force of the steel ball 403 of the one-way valve 4 is greater than FC1 but less than FB1. When the gear rotates, the steel ball 403 of the one-way valve 4 of group C overcomes the resistance of the spring 404 and moves towards the limit part 4022, so that the one-way valve 4 of group C opens. The lubricating oil in the oil storage chamber 103 can enter the flow channel 101 through the one-way valve 4 of group C and finally be output to the gear ring 2. At this time, the one-way valves 4 of groups A and B are not open.

[0040] Medium-speed lubrication stage:

[0041] The drive shaft 3 drives the gear to rotate at a medium speed. At this time, the centrifugal force of the steel ball 403 of the one-way valve 4 is greater than FB1 but less than FA1. When the gear rotates, the steel ball 403 of the one-way valves 4 of groups B and C overcomes the resistance of the spring 404 and moves towards the limit part 4022, so that the one-way valves 4 of groups B and C open. The lubricating oil in the oil storage chamber 103 can enter the flow channel 101 through the one-way valves 4 of groups B and C and finally be output to the gear ring 2. At this time, the one-way valve 4 of group A is not open.

[0042] High-speed lubrication stage:

[0043] The drive shaft 3 drives the gear to rotate at high speed. At this time, the centrifugal force of the steel ball 403 of the one-way valve is greater than that of FA1. When the gear rotates, all the steel balls 403 of the one-way valve overcome the resistance of the spring 404 and move towards the limit part 4022, so that all the one-way valves 4 open. The lubricating oil in the oil storage chamber 103 can enter the flow channel 101 through the one-way valve 4 and finally be output to the gear ring 2.

[0044] When the gear is rotating at low, medium, or high speeds, the steel ball 403 of check valve 2 5 can always overcome the resistance of spring 404 to open check valve 2 5. However, if no lubricating oil is injected into the drive shaft 3 at this time, no lubricating oil will pass through the flow channel 2 102 or check valve 2 5. When it is necessary to replenish oil to the oil reservoir 103, the drive shaft 3 can drive the gear to perform the oil replenishment at a speed lower than the speed during the low-speed lubrication stage. This makes the centrifugal force of the steel ball 403 of check valve 1 4 less than FA1, while the centrifugal force of the steel ball 403 of check valve 2 5 is greater than F2. This causes the steel ball 403 of check valve 2 5 to overcome the resistance of spring 404 and move towards the limiting part 4022, opening check valve 2 5, while check valve 1 4 remains closed. At this time, external lubricating oil can enter the input branch oil channel 302 through the input main oil channel 301, and then enter the oil reservoir 103 through check valve 2 5 to achieve oil replenishment.

[0045] Preferably, the oil reservoir 103 is hemispherical, with the spherical surface facing the gear ring 2, and the connection point between the flow channel 101 and the oil reservoir 103 is located at the center of the spherical surface. This allows the lubricating oil in the oil reservoir 103 to flow along the spherical guide to the flow channel 101. Simultaneously, as... Figure 2 As shown, the diameter of the flow channel 101 extending to one end of the gear ring 2 is reduced to 1 / 3 of the diameter of the port near the oil storage chamber 103. The opening on the side of the gear ring 2 is located on the side wall of the gear teeth. This reduced opening decreases the probability of external lubricating oil flowing back into the flow channel 101. Furthermore, placing the opening of the flow channel 101 on the side of the teeth, compared to the traditional design where the opening is located on the bottom surface of the tooth groove, not only effectively prevents the backflow of lubricating oil but also prevents dust accumulated in the tooth groove from entering the flow channel 101.

[0046] Preferably, the surface of the gear ring 2 is provided with a self-lubricating coating to reduce the coefficient of friction during meshing. The self-lubricating coating can be diamond-like carbon film (DLC), molybdenum disulfide (MoS2), etc.

[0047] The above embodiments are only used to explain the concept of this utility model, and are not intended to limit the protection of this utility model. Any non-substantial modifications made to this utility model using this concept should fall within the protection scope of this utility model.

Claims

1. A self-lubricating gear, comprising a main body disk and a gear ring integrally formed on the outer periphery of the main body disk, wherein a drive shaft mounting hole is formed at the center of the main body disk; characterized in that: The main disc is provided with multiple oil storage chambers, which are arranged in a ring around the drive shaft mounting hole. A flow channel one is provided between the oil storage chamber and the gear ring, and a flow channel two is provided between the oil storage chamber and the drive shaft mounting hole. A one-way valve is installed between the flow channel and the oil storage chamber. The lubricating oil in the oil storage chamber can enter the flow channel through the one-way valve and be output to the gear ring. A one-way valve is installed between the flow channel two and the oil storage chamber, and the lubricating oil entering the flow channel two can enter the oil storage chamber through the one-way valve.

2. A self-lubricating gear as described in claim 1, characterized in that: The one-way valve one and one-way valve two have the same structure, both including a valve seat, valve body, spring and steel ball; The valve seat includes an integrally formed connecting part 1 and a screwing part 1. The connecting part 1 is a hollow external threaded column structure with open ends. The screwing part 1 is a hollow hexagonal column with open ends. The inner diameter of the connecting part 1 is larger than the inner diameter of the screwing part 1, and the outer diameter of the connecting part 1 is larger than the outer diameter of the screwing part 1. The valve body sequentially includes an integrally formed connecting part two, a limiting part, and a screwing part two. The connecting part two is a hollow externally threaded column structure with open ends. The inner wall of the connecting part one is provided with internal threads. The connecting part two is inserted into the connecting part one and threadedly connected to the connecting part one. The inner diameter of the connecting part two is larger than the outer diameter of the steel ball, and the outer diameter of the steel ball is larger than the inner diameter of the screwing part one. The limiting part is a hollow cylindrical structure with open ends. Its outer diameter is smaller than the outer diameter of the connecting part one, and its inner diameter is smaller than the inner diameter of the connecting part two. The end face of the limiting part located on the inner side of the connecting part two forms a spring mounting surface. The steel ball moves in the hollow part of the connecting part two, and the spring abuts between the steel ball and the spring mounting surface. The screwing part two is a hollow hexagonal column with open ends. The inner diameter of the screwing part one, the inner diameter of the screwing part two, and the inner diameter of the limiting part are the same. The outer diameter of the screwing part two is smaller than the outer diameter of the limiting part. The inner walls of the first and second flow channels near the oil storage chamber are threaded. The first check valve is threadedly connected to the first flow channel through the connecting part, and the second check valve is threadedly connected to the second flow channel through the connecting part.

3. A self-lubricating gear as described in claim 2, characterized in that: The oil storage chambers are arranged in six groups, A, B, and C. Two oil storage chambers in the same group are symmetrically arranged and located on the same radial direction. The opening pressure of check valve 1 within the same group is the same, while the opening pressure of check valve 1 differs between different groups. The opening pressure of check valve 1 in group A is defined as F. A1 The opening pressure of check valve 1 in group B is F. B1 The opening pressure of check valve 1 in group C is F. C1 The opening pressure of all one-way valves is F2, and it satisfies F A1 >F B1 >F C1 >F2.

4. A self-lubricating gear as described in claim 1, characterized in that: The oil storage cavity is hemispherical, with the spherical surface facing the gear ring. The connection point between the flow channel and the oil storage cavity is located at the center of the spherical surface.

5. A self-lubricating gear as described in claim 1, characterized in that: The diameter of the flow channel extending to one end of the gear ring is reduced to 1 / 3 of the diameter of the port near the oil storage cavity, and the opening on the side of the gear ring is located on the side wall of the gear ring teeth.

6. A self-lubricating gear as described in claim 1, characterized in that: The surface of the gear ring is provided with a self-lubricating coating.

7. A transmission structure, characterized in that, It includes a drive shaft and a self-lubricating gear as described in any one of claims 1 to 6. The self-lubricating gear is fixed on the drive shaft. The drive shaft is provided with a main input oil passage and input branch oil passages corresponding to the oil storage chambers. The main input oil passage is arranged along the central axis of the drive shaft, and the input branch oil passages are arranged radially along the drive shaft. One end of the input branch oil passage is connected to the main input oil passage, and the other end of the input branch oil passage is directly opposite to and connected to the flow channel.

Images