A self-adjusting clearance type worm gear reducer

Abstract

The present invention relates to a self-adjusting clearance type worm gear reducer, comprising: a clamping assembly, a valve assembly, and a vacuum assembly; a reducer housing is provided with a movable end cover, a worm is inserted into the movable end cover; the clamping assembly comprises a first cylinder body, a piston is provided in the cylinder body, one end of the piston has an elastic element, the other end of the piston has a push rod, the push rod abuts against the movable end cover, and the first cylinder body has an air intake; the valve assembly comprises a second cylinder body, the second cylinder body is provided between the first cylinder body and the reducer housing, a valve body is provided inside the second cylinder body, a valve core is provided in the valve body, the push rod is inserted into the valve core, and the second cylinder body is provided with an air inlet and an air outlet on both sides of the valve body; the vacuum assembly comprises a vacuum generator, the air source interface of the vacuum generator is connected to the air outlet, and the vacuum interface is connected to the air intake. The present invention can solve the problem that the worm gear clearance cannot be adjusted due to the reduction of elastic force caused by the self-elongation of the spring during adjustment.

Description

Technical Field

[0001] The invention relates to the technical field of reducer manufacturing, in particular to a self-adjusting clearance type worm gear reducer. Background Art

[0002] A worm gear reducer is a power transmission mechanism that uses a gear speed converter to reduce the speed of a motor to the desired speed and generate a high torque. Reducers are widely used in mechanisms used to transmit power and motion.

[0003] During the operation of the worm gear reducer, the worm gears contact each other. Long-term use will cause serious wear between the worm gears, resulting in the gradual increase of the direct transmission gap between the worm gears and the reduction of accuracy, which will affect the service life and working efficiency of the reducer.

[0004] Existing techniques typically use a spring mechanism combined with a worm gear for adjustment. The spring tension pushes against the worm gear, and the spring stretches, bringing the worm gears into close contact and reducing the gap. However, as the spring stretches, the elastic force decreases, and the tension increases as the gap widens, making it unable to meet the requirements of high-precision applications. This gap between the worm gears can still increase after prolonged use, and the problem of increased gap between the worm gears has not been fundamentally resolved. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the gap between the worm gear and the worm gear increases due to long-term use; a self-adjusting gap worm gear reducer is needed, which can automatically adjust the gap between the worm gear and the worm gear when a gap appears between the worm gear and the worm gear due to wear.

[0006] In order to solve the above technical problems, the present invention provides a self-adjusting clearance type worm gear reducer, comprising a worm wheel and a worm arranged inside a reducer housing, and further comprising: a pressing assembly, a valve assembly and a vacuum assembly;

[0007] The reducer housing is provided with a movable end cover, and the worm is passed through the movable end cover;

[0008] The pressing assembly includes a first cylinder body, a piston is provided in the first cylinder body, an elastic element is provided between one end of the piston and the first cylinder body, a push rod is provided at the other end of the piston, the push rod abuts against the movable end cover, and an air intake port is opened on the side wall of the first cylinder body, and the air intake port is arranged on the side away from the elastic element;

[0009] The valve assembly includes a second cylinder body, which is arranged between the first cylinder body and the reducer housing. A valve body is arranged inside the second cylinder body, a valve core is arranged in the valve body, and the push rod is arranged in the valve core. The second cylinder body is provided with an air inlet and an air outlet on both sides of the valve body respectively;

[0010] The vacuum assembly includes a vacuum generator, and the vacuum generator is provided with an air source interface and a vacuum interface. The air source interface is communicated with the air outlet, and the vacuum interface is communicated with the air intake.

[0011] In one embodiment of the present invention, a mounting opening for placing the movable end cover is provided on the reducer housing, and the size of the mounting opening is larger than the size of the movable end cover.

[0012] In one embodiment of the present invention, a tapered hole is provided on the valve body, and a taper matching the tapered hole is provided on the valve core, and the valve body and the valve core are tightly fitted.

[0013] In one embodiment of the present invention, a first sealing ring is provided between the push rod and both the first and second cylinder bodies; and a second sealing ring is provided between the piston and the first cylinder body.

[0014] In one embodiment of the present invention, the first cylinder body and the second cylinder body are detachably connected.

[0015] In one embodiment of the present invention, the piston is provided with a piston rod, and the elastic element is sleeved on the piston rod.

[0016] In one embodiment of the present invention, the vacuum assembly further includes an air pipe, the air outlet and the air source interface are communicated through the air pipe, and the vacuum interface and the air intake are communicated through the air pipe.

[0017] In one embodiment of the present invention, both ends of the worm are respectively provided with a first bearing and a second bearing, the first bearing is arranged between the worm and the movable end cover, and the second bearing is arranged between the reducer housing and the worm.

[0018] In one embodiment of the present invention, the worm is provided with a coupling at one end close to the second bearing.

[0019] In one embodiment of the present invention, an output flange is provided on the reducer housing, and the output flange is coaxially arranged with the worm gear.

[0020] The above technical solution of the present invention has the following advantages over the prior art:

[0021] The present invention discloses a self-adjusting clearance type worm gear reducer. The worm gear wears out over a long period of use and produces a gap. The tension of the elastic element pushes the piston, causing the push rod to press against the movable end cover connected to the worm gear. The movement of the push rod drives the valve core mounted on the push rod to move. A gap is generated between the valve core and the valve body, connecting the air inlet and the air outlet. The air outlet is connected to a vacuum generator. The vacuum generator generates negative pressure when it works. The vacuum interface is connected to the vent, driving the piston to move, increasing the thrust of the push rod on the movable end cover, and adjusting the gap of the worm gear. The present invention can avoid the problem that the elastic element itself elongates, resulting in a reduction in elastic force and an inability to adjust the gap of the worm gear. Moreover, as the gap between the worm gears increases, the force for adjusting the gap between the worm gears can be increased, thereby achieving automatic adjustment of the gap between the worm gears and meeting the use environment of the worm gear transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a cross-sectional view of the internal structure of the present invention;

[0025] Figure 3 It is a top view of the internal structure of the present invention;

[0026] Figure 4 for Figure 1 Schematic diagram of the local structure in;

[0027] Explanation of the reference numerals in the specification: 1. Reducer housing; 2. Clamping assembly; 3. Valve assembly; 4. Vacuum assembly; 11. Worm gear; 12. Worm; 13. Removable end cover; 14. First bearing; 15. Second bearing; 16. Coupling; 21. First cylinder; 22. Piston; 23. Push rod; 24. Elastic element; 25. Air intake; 26. First sealing ring; 31. Second cylinder; 32. Valve body; 33. Valve core; 34. Air inlet; 35. Air outlet; 36. Second sealing ring; 41. Vacuum generator; 42. Air source interface; 43. Vacuum interface; 44. Air pipe. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0029] Reference Figure 1As shown, the present invention discloses a self-adjusting clearance type worm gear reducer, comprising a worm wheel 11 and a worm 12 arranged inside a reducer housing 1, and further comprising: a pressing assembly 2, a valve assembly 3 and a vacuum assembly 4;

[0030] Reference Figure 2-3 As shown, a movable end cover 13 is provided on the reducer housing 1, and a worm 12 is passed through the movable end cover 13; the movement of the movable end cover 13 can drive the worm 12 to move, thereby adjusting the gap between the worm 12 and the worm wheel 11.

[0031] The pressing assembly 2 includes a first cylinder 21 in which a piston 22 is disposed. An elastic element 24 is disposed between one end of the piston 22 and the first cylinder 21 . A push rod 23 is disposed at the other end of the piston 22 . The push rod 23 abuts against the movable end cover 13 .

[0032] It can be seen that the piston 22 in the first cylinder body 21 divides the first cylinder body 21 into two cavities. One end of the piston 22 is subjected to the tensioning force of the elastic element 24, driving the piston 22 to move in the first cylinder body 21. The movement of the piston 22 will drive the push rod 23 connected to the piston 22 to move axially. The push rod 23 abuts against the movable end cover 13, driving the worm 12 in the movable end cover 13, so that the worm 12 is in close contact with the worm wheel 11.

[0033] The valve assembly 3 includes a second cylinder body 31, which is arranged between the first cylinder body 21 and the reducer housing 1, and a valve body 32 is arranged inside the second cylinder body 31, and a valve core 33 is arranged inside the valve body 32, and the push rod 23 is passed through the valve core 33; the same as the structure of the first cylinder body 21, the valve body 32 divides the entire second cylinder body 31 into two cavities. After the assembly of the present invention is completed, there is no gap between the worm gear 11 and the worm 12, and the valve core 33 will cooperate with the valve body 32. After long-term use, a gap will appear between the worm gear 11 and the worm 12, and the clamping assembly 2 will drive the push rod 23 to move axially. The movement of the push rod 23 will cause the valve core 33 to leave the valve body 32, and a gap will be generated between the valve core 33 and the valve body 32.

[0034] Reference Figure 3-4 As shown, an air intake port 25 is provided on the side wall of the first cylinder 21, and the air intake port 25 is located on the side away from the elastic element 24. The second cylinder 31 is provided with an air inlet 34 and an air outlet 35 on both sides of the valve body 32. The vacuum assembly 4 includes a vacuum generator 41, which is provided with an air source interface 42 and a vacuum interface 43. The air source interface 42 is connected to the air outlet 35, and the vacuum interface 43 is connected to the air intake port 25. When the air inlet 34 is connected to the air outlet 35, the vacuum generator 41 starts to operate, generating negative pressure, and the vacuum interface 43 is connected to the air intake port 25 of the first cylinder 21, driving the piston 22 to move.

[0035] Specifically, when a gap appears between the worm gear 11 and the worm 12, the elastic element 24 will first extend, driving the piston 22 to make the push rod 23 press against the movable end cover 13. The movement of the push rod 23 drives the valve core 33 to leave the valve body 32, and a gap is generated between the valve core 33 and the valve body 32, connecting the two cavities on both sides of the valve body 32. The compressed air enters from the air inlet 34 and goes out from the air outlet 35. The gas coming out of the air outlet 35 passes through the vacuum generator 41, and a negative pressure is formed at the vacuum interface 43 of the vacuum generator 41, which connects the vacuum interface 43 with the air intake 25 on the first cylinder body 21. The piston 22 forms a negative pressure in the space on one side of the push rod 23, which forms a pulling force on the piston 22, so that the piston 22 drives the push rod 23 to move axially, and adjusts the movable end cover 13 to further make the worm gear 11 and worm 12 fit together. When the gap between the worm wheel 11 and the worm 12 is larger, the distance between the valve body 32 and the valve core 33 will increase, which will increase the air flow of the outlet 35, generate a greater negative pressure, and increase the pressure of the piston 22 on the push rod 23.

[0036] As the elastic element 24 stretches, the tensioning force decreases. As the worm wheel 11 and worm 12 wear, the tensioning force of the elastic element 24 is unable to compress the worm wheel 11 and worm 12. The present invention can solve the problem of adaptively adjusting the gap between the worm wheel 11 and worm 12, automatically adjusting the gap between the worm wheel 11 and worm 12, so that the worm wheel 11 and worm 12 can be tightly meshed, ensuring the precise transmission of the reducer.

[0037] Furthermore, a mounting opening for placing the movable end cover 13 is provided on the reducer housing. In order to facilitate the adjustment of the movable end cover 13, the size of the mounting opening is larger than the size of the movable end cover 13. In the present invention, the movable end cover 13 is connected to the reducer housing 1 by bolts, and a long hole is provided on the movable end cover 13. After the bolts are connected, the entire movable end cover 13 can be adjusted along the radial direction of the bolts. It should be noted that the side of the movable end cover 13 that contacts the top rod 23 is a plane. In the present invention, the movable end cover 13 is square, which facilitates that the force on the top rod 23 can be evenly pressed on the movable end cover 13.

[0038] Furthermore, the valve body 32 is provided with a tapered hole, and the valve core 33 is provided with a taper that matches the tapered hole, forming a sealing slope between the valve body 32 and the valve core 33, and the valve body 32 and the valve core 33 fit tightly. It is important to note that the tapered design of the valve core 33 here not only ensures the seal between the valve core 33 and the valve body 32, but also limits the movement direction of the valve core 33. It is equivalent to a one-way valve. The valve core 33 can only move in one direction, and there will be no gap caused by movement in other directions, thus connecting the cavities on both sides of the valve body 32.

[0039] Furthermore, since the entire automatic adjustment gap is adjusted by the vacuum generator 41, it is necessary to ensure the sealing of the entire device. The entire sealing system in the present invention is realized by a sealing ring. In order to ensure the sealing between the piston 22 and the first cylinder 21 under negative pressure, a first sealing ring 26 is provided between the push rod 23 and the first cylinder 21, and a second sealing ring 36 is provided between the piston 22 and the first cylinder 21. It should be noted that the first cylinder 21 and the second cylinder 31 are two independent spaces. In order to ensure the vacuum degree in the first cylinder 21, it is necessary to ensure the sealing of the first cylinder 21 and the second cylinder 31 at the connection. Preferably, two first sealing rings 26 are provided. During the installation process, the first sealing ring 26 is nested at the ends of the first cylinder 21 and the second cylinder 31, and then the push rod 23 is passed through the middle to ensure the sealing of the joint between the push rod 23 and the first cylinder 21 and the second cylinder 31.

[0040] Furthermore, the first cylinder body 21 and the second cylinder body 31 are two independent parts, and the first cylinder body 21 and the second cylinder body 31 are connected by a coaxially arranged push rod 23. In order to ensure the stability of the connection between the first cylinder body 21 and the second cylinder body 31, the first cylinder body 21 and the second cylinder body 31 are fixed with bolts for easy installation and disassembly.

[0041] Furthermore, a piston rod is provided on the piston 22, and an elastic element 24 is sleeved on the piston rod. The piston rod here mainly serves as a guide. The elastic element 24 is sleeved on the piston rod, using the piston rod as a guide rod, so that the tensioning force of the elastic element 24 can be evenly distributed on the piston 22. At the same time, as a preferred embodiment of the present invention, the elastic element 24 is selected as a spring, and the elastic coefficient and deformation of the spring must meet the design requirements of the present invention.

[0042] Further, refer to Figure 3-4 As shown, the air source in the present invention is mainly compressed air, and the compressed air of the air source is connected to the air inlet 34 of the second cylinder 31. Specifically, the vacuum assembly 4 also includes an air pipe 44, and the air outlet 35 and the air source interface 42 are connected through the air pipe 44, and the vacuum interface 43 and the air intake 25 are connected through the air pipe 44.

[0043] Furthermore, to ensure the stability and accuracy of the transmission between the worm wheel 11 and the worm 12, a first bearing 14 and a second bearing 15 are respectively provided at each end of the worm 12. The first bearing 14 is provided between the worm 12 and the movable end cover 13. During installation, an interference fit is adopted between the first bearing 14 and the movable end cover 13 to prevent shaking between the first bearing 14 and the movable end cover 13, which would affect the adjustment of the entire gap. The second bearing 15 is provided between the reducer housing 1 and the worm 12, and the first bearing 14 and the second bearing 15 play a supporting role to a certain extent.

[0044] Furthermore, a coupling 16 is provided at one end of the worm 12 close to the second bearing 15 for connection with the motor; in addition, an output flange is provided on the reducer housing 1, and the output flange is used to connect other components. The output flange is coaxially arranged with the worm gear 11.

[0045] In summary, the main working principles of the present invention are as follows: when the worm wheel 11 and the worm 12 are normally engaged, the elastic element 24 pushes the piston 22, driving the push rod 23 to press the movable end cover 13. At this time, there is no gap between the valve core 33 and the valve body 32, no gas passes through the second cylinder 31, no gas enters the air source interface 42 of the vacuum generator 41, the vacuum generator 41 does not generate negative pressure, and the piston 22 in the first cylinder 21 is not affected by the force generated by the negative pressure. When the worm gear 11 and worm gear 12 have a gap after long-term use, the self-tensioning force of the elastic element 24 is extended, driving the piston 22 to push the push rod 23 to move axially, so that the push rod 23 is pressed against the movable end cover 13, thereby adjusting the gap between the worm gear 11 and the worm gear 12; at this time, the push rod 23 moves to drive the valve core 33 to leave the valve body 32, and the air inlet 34 on the second cylinder body 31 is connected to the air outlet 35, and the vacuum interface 43 of the vacuum generator 41 generates negative pressure. The piston 22 in the first cylinder body 21 connected to the vacuum interface 43 is sucked by the suction force generated by the negative pressure, driving the push rod 23 to further press the movable end cover 13. The larger the gap between the worm gear 11 and the worm gear 12, the larger the area opened between the valve core 33 and the valve body 32, the larger the flow of compressed air entering the second cylinder body 31, the greater the negative pressure generated by the vacuum generator 41, and the increase in the pressure of the piston 22 on the push rod.

[0046] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A self-adjusting clearance type worm gear reducer, comprising a worm wheel and a worm arranged inside a reducer housing, characterized in that: Also includes: Compression assemblies, valve assemblies, and vacuum assemblies; The reducer housing is provided with a movable end cover, and the worm is passed through the movable end cover; The pressing assembly includes a first cylinder body, a piston is provided in the first cylinder body, an elastic element is provided between one end of the piston and the first cylinder body, a push rod is provided at the other end of the piston, the push rod abuts against the movable end cover, and an air intake port is opened on the side wall of the first cylinder body, and the air intake port is arranged on the side away from the elastic element; The valve assembly includes a second cylinder body, which is arranged between the first cylinder body and the reducer housing. A valve body is arranged inside the second cylinder body, a valve core is arranged in the valve body, and the push rod is arranged in the valve core. The second cylinder body is provided with an air inlet and an air outlet on both sides of the valve body respectively; The vacuum assembly includes a vacuum generator, and the vacuum generator is provided with an air source interface and a vacuum interface. The air source interface is communicated with the air outlet, and the vacuum interface is communicated with the air intake.

2. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The reducer housing is provided with an installation opening for placing the movable end cover, and the size of the installation opening is larger than the size of the movable end cover.

3. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The valve body is provided with a tapered hole, the valve core is provided with a taper matching the tapered hole, and the valve body and the valve core are tightly fitted.

4. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: A first sealing ring is provided between the push rod and the first cylinder body and the second cylinder body; a second sealing ring is provided between the piston and the first cylinder body.

5. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The first cylinder body and the second cylinder body are detachably connected.

6. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The piston is provided with a piston rod, and the elastic element is sleeved on the piston rod.

7. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The vacuum assembly further includes an air pipe, through which the air outlet is communicated with the air source interface, and the vacuum interface is communicated with the air intake port.

8. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The two ends of the worm are respectively provided with a first bearing and a second bearing. The first bearing is arranged between the worm and the movable end cover, and the second bearing is arranged between the reducer housing and the worm.

9. The self-adjusting clearance type worm gear reducer according to claim 8, characterized in that: The worm is provided with a coupling at one end close to the second bearing.

10. The self-adjusting clearance type worm gear reducer according to claim 1, characterized in that: The reducer housing is provided with an output flange, and the output flange is coaxially arranged with the worm gear.

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