traction machine

Abstract

The application discloses a traction machine. It comprises a machine base, a front end cover, a rear end cover, a stator, a rotor, a first rotating shaft, a traction wheel and a second rotating shaft. The rear end cover is provided with a first bearing, and the front end cover is provided with a second bearing. The machine base is provided with a supporting seat in front of the front end cover, and the supporting seat is provided with a third bearing. The two ends of the second rotating shaft are respectively connected with the second bearing and the third bearing in a rotating mode. The traction wheel is arranged on the second rotating shaft between the second bearing and the third bearing. The first rotating shaft is arranged in the machine base. The front end of the first rotating shaft is connected with the rear end of the second rotating shaft in a synchronous rotating mode. The rear end of the first rotating shaft is connected with the first bearing in a rotating mode. The rotor is arranged on the first rotating shaft between the second bearing and the first bearing. The stator is arranged in the machine base. The first rotating shaft drives the rotor to rotate in the stator. The force is reasonable, the bearing capacity is strong, the bending resistance of the second rotating shaft is improved, the air gap between the stator and the rotor is uniform, and the traction machine runs stably with low noise.

Description

Technical Field

[0001] This invention relates to the field of traction machine technology, and more specifically to a high-load and high-speed traction machine. Background Technology

[0002] There are two existing types of traction machines that place the two load-bearing bearings at opposite ends of the traction sheave. One design places one front bearing close to the traction sheave and the other rear bearing far away. This approach has the following problems: due to the large distance between the two bearings, especially since the rear bearing is placed behind the rotor core, the bending resistance of the shaft is poor, thus requiring higher dimensions and quality from the shaft. Furthermore, because the load-bearing center of the traction sheave is closer to the front bearing and farther from the rear bearing, the front bearing needs to bear a greater load, necessitating the use of larger bearings and larger diameter shafts. During operation, noise increases, and the large distance between the two bearings also increases the requirement for concentricity of the bearing housings during machining, increasing manufacturing difficulty.

[0003] Another design is to place the rotor core at the rear end of a bearing, but in order to overcome the attraction between the permanent magnet and the stator, the requirements for the shaft and the frame will be very high, or the two bearing housings can be mounted on a frame with higher rigidity, which makes the structure more complex and the processing requirements higher. Summary of the Invention

[0004] The purpose of this invention is to provide a traction machine with reasonable force distribution.

[0005] The objective of this invention is achieved as follows.

[0006] A traction machine includes a base, a front cover, a rear cover, a stator, a rotor, a first rotating shaft, and a traction sheave. The rear cover is located at the rear end of the base and has a first bearing. The front cover is located at the front end of the base and has a second bearing. The machine also includes a second rotating shaft. The base has a support seat in front of the front cover and has a third bearing. The two ends of the second rotating shaft are rotatably connected to the second and third bearings, respectively. The traction sheave is located on the second rotating shaft between the second and third bearings. The first rotating shaft is located inside the base. The front end of the first rotating shaft and the rear end of the second rotating shaft are connected and rotate synchronously. The rear end of the first rotating shaft is rotatably connected to the first bearing. The rotor is located on the first rotating shaft between the second and first bearings. The stator is located inside the base. The first rotating shaft drives the rotor to rotate within the stator.

[0007] The above technical solution can be further improved as follows.

[0008] A more specific design includes a first bearing chamber on the rear end cover, a fixing groove on the first bearing chamber, an O-ring in the fixing groove, a first bearing placed inside the first bearing chamber, and the outer ring of the first bearing abutting against the O-ring.

[0009] In a more specific scenario, the compressibility of the O-ring is greater than the misalignment between the second and third bearings.

[0010] In a more specific design, both the second and third bearings are load-bearing bearings, and they are equidistantly positioned on both sides of the traction sheave.

[0011] In a more specific design, the second and third bearings are open bearings.

[0012] A more specific design includes a brake wheel on the front cover, a second bearing chamber on the front cover, an oil trough inside the second bearing chamber, a first oil guide pipe on the top of the base, an oil inlet on one end of the first oil guide pipe, and the other end of the first oil guide pipe connected to the oil trough. A second oil guide pipe is located at the bottom of the base, with one end of the second oil guide pipe connected to the oil trough through a second sealing interface, and the other end of the second oil guide pipe forming an oil drain port on the base.

[0013] In a more specific embodiment, the first oil guide pipe is connected to the oil tank through the first sealing interface.

[0014] A more specific design involves installing an oil collection box at the bottom of the base corresponding to the oil drain port, with the oil collection box located below the oil drain port.

[0015] A more specific solution is to mold the front cover and the base as a single piece.

[0016] A more specific solution is that the first and second rotating shafts are molded as a single piece.

[0017] The beneficial effects of this invention are as follows.

[0018] The overall structural design is reasonable. The second and third bearings support the traction sheave through the second rotating bearing, resulting in reasonable force distribution and strong load-bearing capacity. This effectively improves the bending resistance of the second rotating shaft. The first bearing fixes the rear end of the first rotating shaft, ensuring a uniform air gap between the stator and rotor, resulting in smooth operation and low noise of the traction machine. O-rings secure the first bearing, preventing creeping, sintering, or even damage due to the gap between the first bearing and its housing, extending its service life and ensuring reliable operation of the traction machine. Simultaneously, the deformation of the O-rings ensures a uniform air gap between the stator and rotor without affecting the normal use of the second and third bearings. The arrangement of the second and third bearings helps reduce noise and ensure stability during high-speed operation, improving load-bearing capacity. The third and first bearings are positioned externally for easy maintenance. The second bearing is grease-injected through the first oil guide pipe and grease-out through the second oil guide pipe, facilitating maintenance and preventing excess grease from draining from the bearing housing in a timely manner. This prevents overheating of the bearing housing and potential liquefied grease leakage, which could lead to safety accidents. Attached Figure Description

[0019] Figure 1This is a partial cross-sectional structural diagram of an embodiment. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1, see Figure 1 As shown, a traction machine includes a base 1, a rear end cover 2, a front end cover 3, a stator 4, a rotor 5, a first rotating shaft 6, a traction sheave 7, and a second rotating shaft 8. The rear end cover 2 is fixed to the rear end of the base 1 and has a first bearing chamber 21. The first bearing chamber 21 has an annular fixing groove 22, and an O-ring 9 is installed within the fixing groove 22. A first bearing 10 is installed within the first bearing chamber 21, and the outer ring of the first bearing 10 abuts against the O-ring 9, i.e., the O-ring 9 fixes the outer ring of the first bearing 10. The front end cover 3 is located at the front end of the base 1 and has a second bearing chamber 31, which contains a second bearing 11. A support seat 12 is located in front of the front end cover 3 on the base 1, and a third bearing 13 is installed on the support seat 12. The two ends of the second rotating shaft 8 are rotatably connected to the second bearing 11 and the third bearing 13 respectively. The traction sheave 7 is set on the second rotating shaft 8 between the second bearing 11 and the third bearing 13. The first rotating shaft 6 is set inside the machine base 1. The front end of the first rotating shaft 6 and the rear end of the second rotating shaft 8 are connected and rotate synchronously. The rear end of the first rotating shaft 6 is rotatably connected to the first bearing 10. The rotor 5 is set on the first rotating shaft 6 between the second bearing 11 and the first bearing 10. The stator 4 is set inside the machine base 1. The first rotating shaft 6 drives the rotor 5 to rotate inside the stator 4.

[0022] In this embodiment, both the second bearing 11 and the third bearing 13 are load-bearing bearings, such as adjustable roller bearings, and are equidistantly arranged on both sides of the traction sheave 7. Preferably, the second bearing 11 and the third bearing 13 are the same or similar in size. The front cover 3 and the base 1 are designed as separate or integral parts, and the first rotating shaft 6 and the second rotating shaft 8 are also designed as separate or integral parts.

[0023] The second bearing 11 and the third bearing 13 are open bearings. The third bearing 13 is located further out, which facilitates maintenance and extends its service life. However, since the front cover 3 also has a brake wheel 14, the liquefied grease in the second bearing chamber 31 will leak to the end face of the brake wheel 14. The end face of the brake wheel 14 rubs against the brake friction pads to provide braking torque. Once the liquefied oil leaks to the end face of the brake wheel 14, it will reduce the braking torque and cause a safety hazard. Therefore, the second bearing chamber 31 is provided with an oil groove 32 corresponding to the second bearing 11. The top of the base 1 is provided with a first oil guide pipe 16. One end of the first oil guide pipe 16 is provided with an oil injection nozzle 15, and the other end of the first oil guide pipe 16 is connected to the oil groove 32 through a first sealing interface 17. A second oil guide pipe 19 is provided at the bottom of the base 1. One end of the second oil guide pipe 19 is connected to the oil trough 32 through the second sealing interface 18, and the other end of the second oil guide pipe 19 forms an oil drain port on the base 1. An oil collection box 20 is provided at the bottom of the base 1 corresponding to the oil drain port, and the oil collection box 20 is located below the oil drain port. Grease is injected into the upper oil trough 32 through the grease nipple 15, the first oil guide pipe 16, and the first sealing interface 17 and flows into the second bearing 11. Waste oil is discharged from the lower oil trough 32 through the second sealing interface 18 and the oil drain port of the second oil guide pipe 19 into the oil collection box 20. This achieves the maintenance of the second bearing 11 and also ensures that the second bearing 11 avoids the aforementioned safety hazards, making its use safe and reliable.

[0024] The rear end cover 2 and the rear end of the base 1 are fitted with a stop to ensure the concentricity of the first bearing 10, the second bearing 11 and the third bearing 13. The compressibility of the O-ring 9 is greater than the misalignment of the second bearing 11 and the third bearing 13.

[0025] The first bearing 10 is a non-load-bearing bearing. Since the stator 4 and rotor 5 are suspended on the same side of the second bearing 11 and the third bearing 13, there are very strong permanent magnets between the stator 4 and rotor 5. At the same time, due to the requirements of electromagnetic performance, the air gap between the stator 4 and rotor 5 must be very small. Therefore, the frame 1 and the stator 4 or rotor 5 installed in it are easily deformed under the action of strong magnetic attraction, which causes the circumference of the air gap between the stator 4 and rotor 5 to be locally reduced or zero, resulting in the traction machine failing to operate or causing very high noise due to uneven air gap. The rear end of the first shaft 6 is connected and fixed to the frame 1 through the first bearing 10 and the rear end cover 2 to resist the strong magnetic attraction of the permanent magnets, ensuring the uniformity of the air gap between the stator 4 and rotor 5, reducing noise and maintaining the operation of the traction machine. Meanwhile, the outer ring of the first bearing 10 and the inner diameter of the first bearing 10 chamber 21 of the rear end cover 2 are fitted with a clearance, so the first bearing 10 will not be damaged by the load on the traction wheel. The O-ring 9 fixes the first bearing 10, so that the first bearing 10 and the first bearing 10 chamber 21 will not have relative creep, thus preventing sintering or even damage.

[0026] The traction machine structure design in this invention will not reduce the service life of the first bearing 10, the second bearing 11, and the third bearing 13 under heavy-load and high-speed applications, making subsequent maintenance easy and ensuring the safe and reliable operation of the traction machine.

Claims

1. A traction machine, comprising a base, a front end cover, a rear end cover, a stator, a rotor, a first shaft, and a traction sheave, wherein the rear end cover is located at the rear end of the base and is provided with a first bearing, and the front end cover is located at the front end of the base and is provided with a second bearing, characterized in that... It also includes a second rotating shaft. The base has a support seat in front of the front cover, and a third bearing is provided on the support seat. The two ends of the second rotating shaft are rotatably connected to the second bearing and the third bearing, respectively. The traction sheave is set on the second rotating shaft between the second bearing and the third bearing. The first rotating shaft is set inside the base. The front end of the first rotating shaft and the rear end of the second rotating shaft are connected and rotate synchronously. The rear end of the first rotating shaft is rotatably connected to the first bearing. The rotor is set on the first rotating shaft between the second bearing and the first bearing. The stator is set inside the base. The first rotating shaft drives the rotor to rotate inside the stator.

2. The traction machine according to claim 1, characterized in that, The rear end cover is provided with a first bearing chamber, and a fixing groove is provided on the first bearing chamber. An O-ring is provided in the fixing groove. The first bearing is placed in the first bearing chamber, and the outer ring of the first bearing abuts against the O-ring.

3. The traction machine according to claim 2, characterized in that, The compressibility of the O-ring is greater than the misalignment between the second and third bearings.

4. The traction machine according to claim 1, characterized in that, Both the second and third bearings are load-bearing bearings, and they are equidistantly arranged on both sides of the traction sheave.

5. The traction machine according to claim 4, characterized in that, The second and third bearings are open bearings.

6. The traction machine according to claim 5, characterized in that, The front cover is also equipped with a brake wheel of the brake. The front cover is equipped with a second bearing chamber. The second bearing is placed in the second bearing chamber. The second bearing chamber is equipped with an oil trough. The top of the machine base is equipped with a first oil guide pipe. One end of the first oil guide pipe is equipped with an oil injection nozzle. The other end of the first oil guide pipe is connected to the oil trough. The bottom of the machine base is equipped with a second oil guide pipe. One end of the second oil guide pipe is connected to the oil trough through a second sealing interface. The other end of the second oil guide pipe forms an oil drain port on the machine base.

7. The traction machine according to claim 6, characterized in that, The first oil guide pipe is connected to the oil tank through the first sealing interface.

8. The traction machine according to claim 6, characterized in that, An oil collection box is provided at the bottom of the base corresponding to the oil drain port, and the oil collection box is located below the oil drain port.

9. The traction machine according to any one of claims 1-8, characterized in that, The front cover and the base are molded as one piece.

10. The traction machine according to claim 1, characterized in that, The first and second rotating shafts are formed as a single piece.

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