Self-lubricating powder metallurgy gear

Abstract

The utility model discloses a self-lubricating powder metallurgy gear. The self-lubricating powder metallurgy gear comprises a gear body, and an oil storage cavity and a plurality of automatic oil pumping mechanisms are arranged on the gear body; the automatic oil pumping mechanism comprises an oil pumping cavity formed in the gear body, an oil supply channel is formed between the oil pumping cavity and the oil storage cavity, a piston rod is installed in the oil pumping cavity, a reset spring is installed between the piston rod and the inner wall of the oil pumping cavity, one end of the piston rod extends out of the gear body, and the other end of the piston rod extends out of the gear body. And a gasket is mounted at one end part of the piston rod. According to the self-lubricating powder metallurgy gear, the gear body, the oil storage cavity and the automatic oil pumping mechanism comprising the oil pumping cavity, the oil supply channel, the piston rod, the reset spring, the gasket and the first sealing ring are arranged, lubricating oil can be automatically and intermittently pumped into tooth grooves of the gear body, self-lubricating of the gear body is achieved, and use is more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear technical field especially relates to a self -lubricating powder metallurgy gear. BACKGROUND

[0002] Gear is the mechanical component in people's life, it is widely used in mechanical transmission mechanism for transmitting motion and power. Powder metallurgy is the process technology of making metal material, composite and various types of products by using metal powder (or mixture of metal powder and non-metal powder) as raw material, through forming and sintering. Gear is driven by mutual meshing, which will cause wear on the tooth surface and produce noise during transmission, reducing the precision and service life of the gear, therefore, the gear needs to be lubricated to reduce the wear rate and noise.

[0003] At present, the lubrication mode of gear mostly adopts external oiling lubrication, that is, adding lubricating oil to the surface of gear by artificial to lubricate the gear, such as drop oil lubrication (dropping lubricating oil to the friction surface of the pair), splash lubrication (spraying lubricant to the friction surface of the pair), oil injection lubrication and oil immersion lubrication, etc. These methods can keep the gear lubricated, but they need to be regularly performed by artificial, which has high labor cost.

[0004] Therefore, it is necessary to provide a self-lubricating powder metallurgy gear to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a self-lubricating powder metallurgy gear which can be automatically lubricated and is convenient to use.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The self-lubricating powder metallurgy gear comprises a gear body manufactured by powder metallurgy technology, and the gear body is provided with an oil storage cavity and a plurality of automatic oil pumping mechanisms; the automatic oil pumping mechanism comprises an oil pumping cavity formed in the gear body, an oil supply channel is arranged between the oil pumping cavity and the oil storage cavity, a piston rod is installed in the oil pumping cavity, a return spring is installed between the piston rod and the inner wall of the oil pumping cavity, one end of the piston rod extends to the outside of the gear body, a gasket is installed on one end of the piston rod, and a first sealing ring is embedded and installed on the inner wall of the oil pumping cavity.

[0008] Preferably, two second sealing rings are installed on the piston rod in a sleeved manner, and an oil outlet hole is arranged on one side of the oil pumping cavity.

[0009] Preferably, a positioning pipe is installed in the oil pumping cavity, and a third sealing ring is installed on the end of the positioning pipe.

[0010] Preferably, a communication hole is formed in the gear body.

[0011] Preferably, a piston ring is installed inside the oil reservoir, and multiple compression springs are evenly installed on the top of the piston ring.

[0012] Preferably, an oil injection pipe is installed on the gear body, an oil injection channel is provided between the oil injection pipe and the oil storage chamber, a limit ring is installed in the oil storage chamber, and a one-way valve is installed on the oil injection pipe.

[0013] Preferably, the gear body is composed of a first part, a second part, and a third part.

[0014] Preferably, the top of the oil storage chamber is provided with an air inlet / outlet port.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) By setting up a gear body, an oil storage chamber, and an automatic oil pumping mechanism including an oil pumping chamber, an oil supply channel, a piston rod, a return spring, a gasket, and a first sealing ring, this utility model can automatically and intermittently pump lubricating oil into the tooth grooves of the gear body, thereby achieving self-lubrication of the gear body and making it more convenient to use.

[0017] (2) By setting a second sealing ring and an oil outlet, this utility model can conveniently control the discharge speed of lubricating oil;

[0018] (3) By setting a positioning tube and installing a third sealing ring, this utility model can conveniently limit the stroke of the piston rod;

[0019] (4) By providing a connecting hole at the root of the teeth of the gear body, this utility model can improve the stability of gear lubrication and reduce costs;

[0020] (5) By installing a piston ring and a compression spring in the oil storage chamber, this utility model can conveniently provide pressure to the lubricating oil in the oil storage chamber and facilitate the supply of oil to the pump chamber.

[0021] (6) By setting up an oil injection pipe, an oil injection channel and a one-way valve, this utility model can conveniently add lubricating oil to the oil storage chamber. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of the self-lubricating powder metallurgy gear provided by this utility model;

[0023] Figure 2 for Figure 1 A schematic cross-sectional view of a self-lubricating powder metallurgy gear is shown.

[0024] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle;

[0025] Figure 4 For Figure 2 Enlarged structural schematic view of the middle B part.

[0026] Wherein, the corresponding name of the reference sign is: 1-gear body, 2-automatic oil pumping mechanism, 3-oil storage cavity, 4-pump oil cavity, 5-oil supply channel, 6-piston rod, 7-return spring, 8-gasket, 9-first sealing ring, 10-second sealing ring, 11-positioning tube, 12-third sealing ring, 13-communication hole, 14-oil outlet hole, 15-piston ring, 16-extrusion spring, 17-oil injection pipe, 18-oil injection channel, 19-one-way valve, 20-first sub-body, 21-second sub-body, 22-third sub-body, 23-inlet and outlet air hole. DETAILED DESCRIPTION

[0027] The utility model will be further explained below by combining with the drawings and examples, and the mode of the utility model includes but is not limited to the following examples.

[0028] For example, Figures 1-4The utility model provides a self -lubricating powder metallurgy gear, including: the gear body 1 of powder metallurgy technology manufacture, automatic oil pumping mechanism 2 is arranged in each tooth slot of gear body 1, be equipped with annular oil storage cavity 3 in gear body 1, automatic oil pumping mechanism 2 includes the oil pumping cavity 4 of being set up in gear body 1, oil pumping cavity 4 with oil storage cavity 3 between being equipped with oil supply channel 5, through oil supply channel 5 will the lubricating oil in oil storage cavity 3 supply into oil pumping cavity 4, install piston rod 6 in oil pumping cavity 4, install return spring 7 between piston rod 6 and oil pumping cavity 4 inner wall, and one end of piston rod 6 extends to the tooth slot outside gear body 1, and install gasket 8 at the end of piston rod 6, according to the different of gear use requirement, can select the gasket 8 of different material type, for example rubber gasket, copper gasket or wear -resistant sheet etc. Embed and install first sealing ring 9 on oil pumping cavity 4 inner wall, through first sealing ring 9, make piston rod 6 with oil pumping cavity 4 inner sealed sliding connection, when using, gear body 1 installs on the equipment and uses, and the mating gear of meshing installation is contacted and is pressed gasket 8 to move to oil pumping cavity 4 with the tooth of mating gear when the tooth of mating gear is cut into the tooth slot of gear body 1 and leaves the process, the top of tooth, and then make piston rod 6 move and compress return spring 7, make piston rod 6 and first sealing ring 9 separate and continue to move a distance, make the lubricating oil in the left side of oil pumping cavity 4 be extruded by piston rod 6, make lubricating oil enter the right side space of piston rod 6 in oil pumping cavity 4, with the tooth of mating gear leaves the tooth slot, under the action of return spring 7, make piston rod 6 move and contact first sealing ring 9, then piston rod 6 continues to move to the initial position right side, the lubricating oil in the right side of oil pumping cavity 4 is extruded by piston rod 4, make lubricating oil enter the tooth slot from the gap between piston rod 6 and gear body 1, then realize the self -lubricating of gear, until the tooth slot and mating gear next time mesh, will carry out next time's oil pumping lubrication work, to realize intermittent self -lubricating operation. It is worth mentioning that, the oil amount of each self -lubricating pumping, with the initial position of piston rod 6 and the position of first sealing ring 9 is related, with the distance of piston rod 6 outside end distance first sealing ring 9 to explain, in the case not more than effective stroke, the greater the distance, then single pumping amount is smaller, on the contrary then greater, in addition, single pumping amount is also related with the gap between piston rod 6 and gear body 1, the gap can not be too small, otherwise will affect normal pumping, also can not be too big, otherwise will lead to the too fast leakage of lubricating oil in the right side of oil pumping cavity 4. This kind of structure design is more suitable for low speed gear use, is not too suitable for the gear of medium and high speed, and the gear is best vertical installation, and horizontal installation influences lubrication effect.

[0029] Through setting up gear body 1, oil storage cavity 3 and including oil pumping cavity 4, oil supply channel 5, piston rod 6, return spring 7, gasket 8 and first sealing ring 9 automatic oil pumping mechanism 2, can automatically intermittent to the tooth slot of gear body 1 pump lubricating oil, realize the self -lubricating of gear body, use more convenient.

[0030] Example 2:

[0031] like Figure 4 As shown, in this embodiment, two second sealing rings 10 are fitted onto the piston rod 6 to properly seal the contact area between the piston rod 6 and the gear body 1, preventing lubricating oil from flowing out in large quantities from the gaps. The second sealing rings 10 are embedded in the gear body 1 and fixed in place. An oil outlet hole 14 is provided on one side of the oil pump chamber 4. The diameter of the oil outlet hole 14 is designed as needed. If the viscosity of the lubricating oil is too high, the diameter is increased; otherwise, the diameter is decreased. Therefore, by controlling the diameter of the oil outlet hole 14, the flow rate of the lubricating oil can be more easily controlled. In use, the piston rod 6 moves to the right, so that the lubricating oil in the right space of the oil pump chamber 4 is compressed by the piston rod 6 and flows out from the oil outlet hole 14 into the gear groove. As the gear rotates, it lubricates the gear surface.

[0032] By setting the second sealing ring 10 and the oil outlet hole 14, the discharge speed of the lubricating oil can be easily controlled.

[0033] Example 3:

[0034] like Figure 4 As shown, a positioning tube 11 is installed in the pump oil chamber 4, and a third sealing ring 12 is installed at the end of the positioning tube 11. When in use, when the piston rod 6 moves to the right to contact the third sealing ring 12 and moderately squeezes the third sealing ring 12, the piston rod 13 stops moving, which can conveniently limit the stroke of the piston rod 6. This position is the initial position of the piston rod 6. The third sealing ring 12 can play a shock absorption and buffering role and effectively reduce the wear rate.

[0035] By setting the positioning tube 11 and installing the third sealing ring 12, the stroke limit of the piston rod 6 can be easily achieved.

[0036] Example 4:

[0037] like Figure 4 As shown, in this embodiment, a connecting hole 13 is provided at the root of the teeth of the gear body 1. The connecting hole 13 connects the tooth grooves on both sides of the teeth. Therefore, when one of the automatic oil pumping mechanisms 2 fails to pump oil normally, the lubricating oil on the other side of the teeth can enter the tooth groove on the other side through the connecting hole 13 to lubricate the tooth groove, thereby improving the stability of gear lubrication. It is worth noting that this structural design can also effectively reduce the number of automatic oil pumping mechanisms 2 required for the gear. For example, a gear with 48 teeth may only need 24 or even fewer automatic oil pumping mechanisms 2 to achieve stable self-lubrication, thereby effectively reducing the cost of the gear.

[0038] By providing a connecting hole 13 at the root of the teeth in the gear body 1, the stability of gear lubrication can be improved and the cost can be reduced.

[0039] Example 5:

[0040] like Figures 2-3 As shown, a piston ring 15 is installed in the oil reservoir 3, and the piston ring 15 slides and seals with the inner wall of the oil reservoir 3. Multiple compression springs 16 are evenly installed on the top of the piston ring 15. The oil reservoir 3 below the piston ring 5 stores lubricating oil. The compression springs 16 are in a compressed state. When in use, the lubricating oil in the pump oil chamber 4 decreases, allowing the lubricating oil in the oil reservoir 3 to enter the pump oil chamber 4 through the oil supply channel 5. At the same time, the compressed compression springs 16 extend and push the piston ring 15 down, which can continuously provide pressure to the lubricating oil in the oil reservoir 3 and prevent the lubricating oil in the oil reservoir 3 from not being able to enter the pump oil chamber 4.

[0041] By installing piston ring 15 and compression spring 16 in oil reservoir 3, pressure can be easily provided to the lubricating oil in oil reservoir 3, which facilitates oil supply to pump oil reservoir 4.

[0042] Example 6:

[0043] like Figure 3 As shown, in this embodiment, the top of the oil storage chamber 3 is provided with an air inlet / outlet hole 23. When in use, outside air can enter the space of the oil storage chamber 3 above the piston ring 15 through the air inlet / outlet hole 23. Similarly, the air above the piston ring 15 can also be discharged through the air inlet / outlet hole 23, thereby balancing the pressure inside and outside the oil storage chamber 3.

[0044] By setting an air inlet / outlet port 23 at the top of the oil storage chamber 3, the air inlet and outlet of the oil storage chamber 3 can be conveniently vented, thus balancing the internal and external pressures.

[0045] Example 7:

[0046] like Figures 2-3 As shown, an oil injection pipe 17 is installed on the gear body 1. An oil injection channel 18 is provided between the oil injection pipe 17 and the oil storage chamber 3. A limiting ring is installed above the outlet of the oil injection channel 18 in the oil storage chamber 3 to prevent the piston ring 15 from blocking the outlet of the oil injection channel 18 when it descends. A one-way valve 19 is installed at the top of the oil injection pipe 17. In use, when the piston ring 15 descends to its lowest position (contacting the limiting ring), the lubricating oil in the oil storage chamber 3 can no longer supply oil to the pump oil chamber 4. At this time, lubricating oil can be injected into the oil injection pipe 17 under high pressure through the one-way valve 19. The lubricating oil enters the oil storage chamber 3 through the oil injection channel 18 and continuously pushes the piston ring 15 up, compressing the compression spring 16. The air above the piston ring 16 is discharged from the air inlet / outlet hole 23 until oil injection stops. It is worth noting that the one-way valve 19 is suitable for use with large gears. For small gears, a sealing cap can be used instead of the one-way valve to reduce costs.

[0047] By setting up the oil injection pipe 17, the oil injection channel 18 and the one-way valve 19, lubricating oil can be easily added to the oil storage chamber 3.

[0048] Example 8:

[0049] like Figures 2-4 Figures 2-4 As shown, in this embodiment, the gear body 1 is composed of three powder metallurgy components, including a first component 20, a second component 21, and a third component 22. The first component 20, the second component 21, and the third component 22 are combined to form an oil storage chamber 3, an oil pumping chamber 4, an oil supply channel 5, an oil injection channel 18, as well as teeth, tooth grooves, etc. Other structures, such as oil outlet holes 14, which cannot be directly formed by powder metallurgy, are formed through post-processing. As for more specific structures, they can be designed as needed, and will not be described in detail here.

[0050] By setting up a gear body 1 including a first part 20, a second part 21, and a third part 22, normal assembly and use of powder metallurgy gears can be achieved.

[0051] Working principle: During use, the gear body 1 is installed on the equipment. When the mating gear meshes with it, as the teeth of the mating gear cut into the tooth groove of the gear body 1 and then leave, the top of the teeth contacts and presses the gasket 8 into the oil pumping chamber 4, which in turn moves the piston rod 6 and compresses the return spring 7. This causes the piston rod 6 to disengage from the first sealing ring 9 and continue to move a certain distance, squeezing the lubricating oil on the left side of the oil pumping chamber 4 into the space on the right side of the oil pumping chamber 4. As the teeth of the mating gear leave the tooth groove, under the action of the return spring 7, the piston rod 6 moves and contacts the first sealing ring 9. Then, the piston rod 6 continues to move to the right to the initial position, squeezing the lubricating oil on the right side of the oil pumping chamber 4 into the tooth groove through the gap between the piston rod 6 and the gear body 1, thus achieving one self-lubrication of the gear. The next oil pumping and lubrication operation will only be performed when the tooth groove meshes with the mating gear again, thus achieving intermittent self-lubrication.

Claims

1. A self-lubricating powder metallurgy gear, characterized by, Include: Gear body (1), the gear body (1) is provided with oil storage cavity (3) and a plurality of automatic oil pumping mechanism (2) on it; The automatic oil pumping mechanism (2) includes the oil pumping cavity (4) opened in the gear body (1), the oil pumping cavity (4) is equipped with oil supply channel (5) between the oil storage cavity (3), the oil pumping cavity (4) is installed with piston rod (6), the piston rod (6) is installed with reset spring (7) between the inner wall of the oil pumping cavity (4), one end of the piston rod (6) extends to the gear body (1) outside, one end of the piston rod (6) is installed with gasket (8), the first sealing ring (9) is embedded and installed on the inner wall of the oil pumping cavity (4).

2. The self-lubricating powder metallurgy gear according to claim 1, wherein Two second sealing rings (10) are installed on the piston rod (6), and the oil outlet hole (14) is arranged on one side of the oil pumping cavity (4).

3. The self-lubricating powder metallurgy gear of claim 1, wherein The oil pumping cavity (4) is installed with positioning pipe (11), and the third sealing ring (12) is installed at the end of the positioning pipe (11).

4. The self-lubricating powder metallurgy gear of claim 1, wherein The gear body (1) is provided with a communication hole (13).

5. The self-lubricating powder metallurgy gear of claim 1 wherein, The oil storage cavity (3) is installed with piston ring (15), and a plurality of extrusion springs (16) are uniformly installed on the top of the piston ring (15).

6. The self-lubricating powder metallurgy gear of claim 1 wherein, The gear body (1) is installed with oil injection pipe (17), and the oil injection pipe (17) is provided with oil injection channel (18) between the oil storage cavity (3), the oil storage cavity (3) is installed with a limiting ring, and the oil injection pipe (17) is installed with a one-way valve (19).

7. The self-lubricating powder metallurgy gear of claim 1 wherein, The gear body (1) is composed of a first part (20), a second part (21) and a third part (22).

8. The self-lubricating powder metallurgy gear of claim 1, wherein The top of the oil storage cavity (3) is provided with an air inlet and outlet hole (23).

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