Sanitation vehicle direct drive motor shaft extension end protection device

Abstract

This invention discloses a protective device for the shaft extension end of a direct-drive motor in a sanitation vehicle. The device includes a rotating shaft with an oil seal dust cover connected to it. The oil seal dust cover and the double-lip skeleton oil seal form a multi-stage protective structure. The double-lip skeleton oil seal has an inner lip and an outer lip. An output flange and a flange nut are also provided on the rotating shaft. This combined structure of the double-lip skeleton oil seal and the oil seal dust cover significantly improves the dust and water resistance of the shaft extension end, adapting to complex working conditions with abundant mud and high humidity. It reduces the risk of single-seal failure, as the double-lip skeleton oil seals are redundant. The oil seal dust cover reduces wear on the oil seal lips, effectively extending the service life of the seals and reducing the probability of motor failure due to oil seal failure. Furthermore, this design is simple and compact, easy to assemble and disassemble, facilitating subsequent oil seal replacement and maintenance, and reducing the operation and maintenance costs of sanitation vehicles.

Description

Technical Field

[0001] This invention belongs to the field of motor protection technology, and specifically relates to a protective device for the shaft extension end of a direct drive motor in a sanitation vehicle. Background Technology

[0002] Currently, new energy sanitation vehicles are widely used in the market, representing an important measure for urban green and low-carbon development. Compared to traditional fuel-powered sanitation vehicles, new energy sanitation vehicles have advantages such as zero exhaust emissions and no fuel pollution. However, sanitation vehicles often operate in harsh environments with abundant mud, sewage, and dust. The shaft extension end of the direct-drive motor is a weak point for mud and sewage intrusion. Fine particles and sludge can easily penetrate the mating surface between the oil seal lip and the shaft, causing scratches and uneven wear on the lip. After long-term operation, the sealing gap widens, leading to grease leakage and impurities entering the bearing. At the same time, the rubber material is prone to aging and hardening in high-temperature, oily, and acidic / alkaline sewage environments, resulting in decreased elasticity and rapid decline in sealing capacity. Traditional oil seal protection structures are prone to wear and aging under high-load and high-pollution environments, leading to oil seal failure, impurities entering the bearing, motor failure, and shortened service life.

[0003] To address this issue, China has invented a protective device for the extended end of a motor shaft (patent publication number: CN218564394U). This design includes an end cover, with a drive shaft movably connected to its center. Both ends of the drive shaft extend to the outside of the end cover. An upper groove is located at the top of the end cover outside the drive shaft, and an oil seal skeleton is mounted on the inner wall of the upper groove. A lower groove is located at the bottom of the end cover outside the drive shaft, and a bearing sleeve is mounted on the inner wall of one section of the lower groove. A transparent protective cover is installed at the top of the end cover outside the drive shaft. An annular positioning plate is located on the outer wall of the transparent protective cover near the end cover, with its bottom end in contact with the top of the end cover. A limiting ring is located on the inner wall of the transparent protective cover near the end cover. This structure not only improves the protection of the lower end of the drive shaft during use but also reduces the possibility of the oil seal skeleton detaching during use and improves the sealing performance of the protective device. However, this patent has the following problems:

[0004] 1. This protective device has a large number of parts, a complex structure, high part costs, and requires a lot of installation space;

[0005] 2. During long-term use, mud, dust, and splashed sewage can easily accumulate at the junction of the rotating shaft and the outer lip of the oil seal after entering the transparent sleeve. This direct contact with the oil seal lip causes wear and leads to faster oil seal failure.

[0006] 3. This solution requires increasing the length of the rotating shaft to allow space for the transparent sleeve and positioning plate, which increases the cost.

[0007] Therefore, it is necessary to design a highly reliable, multi-level protective dustproof device for the shaft extension end. Summary of the Invention

[0008] The main objective of this invention is to provide a protective device for the shaft extension end of a direct drive motor in sanitation vehicles, which solves the problems of numerous parts, high manufacturing difficulty, high cost, and easy detachment in current dustproof devices for the shaft extension end of direct drive motors.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a protective device for the shaft extension end of a direct drive motor of a sanitation vehicle, including a rotating shaft, an oil seal dust cover is provided on the rotating shaft, the oil seal dust cover is connected to a double-lip skeleton oil seal, the oil seal dust cover and the double-lip skeleton oil seal form a multi-level protective structure, the double-lip skeleton oil seal is provided with an inner lip and an outer lip, and the rotating shaft is also provided with an output flange and a flange nut.

[0010] Furthermore, an end cap is provided at the outer end of the shaft.

[0011] Furthermore, the output flange is fitted with a flange nut, and the flange nut axially locks the output flange.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The combined structure of the double-lip skeleton oil seal and oil seal dust cover can significantly improve the dustproof and waterproof capabilities of the shaft extension end, meet the protection requirements of sanitation vehicles of IP67 and above, and adapt to complex working conditions with lots of mud and sand and high humidity.

[0014] 2. The multi-level protection structure reduces the risk of single seal failure. The double-lip skeleton oil seals are redundant, and the oil seal dust cover reduces wear on the oil seal lips, effectively extending the service life of the seals and reducing the probability of motor failure due to oil seal failure.

[0015] 3. This solution has a simple and compact structure, is easy to disassemble and assemble, facilitates the replacement and maintenance of oil seals in the future, and reduces the operation and maintenance costs of sanitation vehicles;

[0016] 4. The flange nut axially locks the output flange to ensure the coaxiality of the flange and the shaft, avoids uneven wear of the oil seal lip due to eccentricity, and improves the long-term stability of the sealing structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a protective device for the shaft extension end of a direct drive motor of a sanitation vehicle according to the present invention.

[0018] In the diagram: 1. Output flange; 2. Flange nut; 3. Oil seal dust cover; 4. Shaft; 5. Double-lip skeleton oil seal; 6. End cover. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] See Figure 1 This invention discloses a protective device for the shaft extension end of a direct-drive motor in a sanitation vehicle, including a rotating shaft 4. An oil seal dust cover 3 is installed on the rotating shaft 4, and a double-lip skeleton oil seal 5 is connected to the oil seal dust cover 3. The oil seal dust cover 3 serves as the first layer of protection, which can prevent large particles of mud, dust, and splashing sewage from directly impacting the oil seal, reducing direct wear on the oil seal lip, and lowering the probability of external impurities entering. The double-lip skeleton oil seal 5 serves as the second layer of protection, forming two radial sealing barriers. The inner lip of the double-lip skeleton oil seal 5 can prevent the leakage of lubricating grease from inside the motor, and the outer lip of the double-lip skeleton oil seal 5 can prevent residual small impurities and moisture from entering. The cavity between the two oil seals can store a small amount of lubricating grease, while buffering the impact of impurities.

[0021] By incorporating a multi-level protection structure with a double-lip skeleton oil seal 5 and an oil seal dust cover 3, the dustproof and waterproof capabilities of the shaft extension end can be significantly improved, meeting the IP67 and above protection requirements of sanitation vehicles and adapting to complex working conditions with abundant mud and sand and high humidity. Furthermore, the multi-level protection structure reduces the risk of single-seal failure; the double-lip skeleton oil seal 5 provides redundancy, and the oil seal dust cover 3 reduces wear on the oil seal lips, effectively extending the service life of the seals and reducing the probability of motor failure due to oil seal failure.

[0022] Furthermore, an end cap 6 is also provided at the outer end of the rotating shaft 4.

[0023] Furthermore, the rotating shaft 4 is also equipped with an output flange 1 and a flange nut 2. The output flange 1 and the flange nut 2 are fitted together to form a partial labyrinth-like protection, further preventing impurities from entering along the axial direction of the rotating shaft 4. The flange nut 2 axially locks the output flange 1, ensuring the coaxiality of the flange and the rotating shaft 4, avoiding uneven wear of the oil seal lip due to eccentricity, which could lead to oil seal failure, and thus improving the long-term stability of the sealing structure.

[0024] This solution has a simple and compact structure, is easy to disassemble and assemble, facilitates the replacement and maintenance of oil seals in the future, and reduces the operation and maintenance costs of sanitation vehicles.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective device for the shaft extension end of a direct-drive motor in a sanitation vehicle, characterized in that: Includes a rotating shaft (4), on which an oil seal dust cover (3) is provided, and the oil seal dust cover (3) is connected to a double-lip skeleton oil seal (5). The oil seal dust cover (3) and the double-lip skeleton oil seal (5) form a multi-level protection structure. The double-lip skeleton oil seal (5) is provided with an inner lip and an outer lip. The rotating shaft (4) is also provided with an output flange (1) and a flange nut (2).

2. The protective device for the shaft extension end of a direct-drive motor in a sanitation vehicle according to claim 1, characterized in that: An end cap (6) is also provided at the outer end of the rotating shaft (4).

3. The protective device for the shaft extension end of a direct-drive motor in a sanitation vehicle according to claim 1, characterized in that: The output flange (1) is fitted with a flange nut (2), and the flange nut (2) axially locks the output flange (1).

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