Self-lubricating maintenance-free wiper drive assembly

Abstract

The utility model relates to rail transit vehicle wiper drive component technical field discloses a kind of self-lubricating maintenance-free wiper drive assembly, including drive motor, transmission mechanism, shaft assembly and anti-falling structure;The transmission mechanism includes crank assembly, connecting rod and joint bearing, joint bearing and shaft sleeve form self-lubricating connecting pair;The anti-falling structure includes the elastic baffle ring of shaft for being installed at host computer rotating shaft;The crank assembly, connecting rod and shaft assembly are all made of stainless steel 304 material;The output end of drive motor is connected with crank assembly transmission by worm gear reduction device, and the both ends of connecting rod are respectively hinged with crank assembly and shaft assembly through self-lubricating connecting pair.It realizes that drive assembly connecting pair is self-lubricating maintenance-free, rotating shaft is reliably fixed and does not fall off, improves mechanical structure corrosion resistance wear resistance simultaneously, reduces maintenance cost, prolongs the service life of drive assembly.

Description

Technical Field

[0001] This utility model relates to the technical field of windshield wiper drive components for rail transit vehicles, specifically to a self-lubricating, maintenance-free windshield wiper drive assembly. Background Technology

[0002] The windshield wiper drive assembly is the core power source of the windshield wiper system in rail transit vehicles. Its operational stability and reliability directly determine the wiping effect of the wipers, which in turn affects the driver's visibility and driving safety in adverse weather conditions. With the increase in the operating mileage and intelligent upgrades of As-type rail vehicles, higher requirements are placed on the durability and ease of maintenance of the drive assembly.

[0003] The connecting parts (such as spherical bearings and bushings) of existing rail vehicle wiper drive assemblies mostly use ordinary lubrication structures, requiring regular disassembly and oiling maintenance. This not only increases operation and maintenance costs and time but also makes the connecting parts prone to wear and jamming due to untimely maintenance. The main shaft of the drive assembly lacks a reliable anti-detachment structure, and after long-term high-frequency reciprocating motion, it is prone to loosening or even detachment, causing safety hazards. In addition, the mechanical structures such as the crank assembly, connecting rod, and shaft assembly of the drive assembly are mostly made of ordinary steel, which is prone to corrosion and mechanical wear in complex outdoor environments such as humidity and dust, leading to decreased drive efficiency, increased failure rate, and seriously affecting the service life of the drive assembly. These defects all restrict the long-term stable operation of rail vehicle wiper systems. Utility Model Content

[0004] The present invention aims to provide a self-lubricating and maintenance-free wiper drive assembly to solve the technical problems of existing rail vehicle wiper drive assemblies, such as the need for regular oiling and maintenance of the connecting parts, easy detachment of the rotating shaft, and high failure rate and short service life due to corrosion and wear of the mechanical structure.

[0005] To solve the above problems, the present invention adopts the following technical solution: The self-lubricating, maintenance-free wiper drive assembly includes a drive motor, a transmission mechanism, a shaft assembly, and an anti-detachment structure. The transmission mechanism includes a crank assembly, a connecting rod, and a spherical bearing, with the spherical bearing and bushing forming a self-lubricating connection pair. The anti-detachment structure includes a shaft elastic retaining ring installed on the main unit's rotating shaft. The crank assembly, connecting rod, and shaft assembly are all made of 304 stainless steel. The output end of the drive motor is connected to the crank assembly via a worm gear reducer, and both ends of the connecting rod are hinged to the crank assembly and shaft assembly respectively via a self-lubricating connection pair.

[0006] Beneficial effects: Maintenance-free operation is achieved through self-lubricating connecting pairs, elastic retaining rings on the shaft prevent the shaft from falling off, and the 304 stainless steel material enhances corrosion and wear resistance. These three factors work together to ensure the stable and reliable operation of the drive assembly.

[0007] Furthermore, the spherical bearing of the self-lubricating connection pair is an oil-impregnated bearing with an oil content of 20-30% and a continuous maintenance-free operation cycle of not less than 8000 hours.

[0008] Beneficial effects: Clarifying the core parameters of oil-impregnated bearings ensures the long-lasting self-lubricating effect of the connecting pairs, meeting the maintenance-free requirements for long-term operation of rail vehicles.

[0009] Furthermore, the cross-sectional diameter of the elastic retaining ring for the shaft is 2-3mm, and its inner diameter is 1-1.5mm smaller than the shoulder diameter of the main shaft. The preload after assembly is 50-80N.

[0010] Beneficial effects: Through precise dimensional and pre-tightening force design, the elastic retaining ring ensures reliable fixation of the shaft, effectively preventing the shaft from loosening and falling off under high-frequency motion.

[0011] Furthermore, the surface of the mechanical structure made of stainless steel 304 is passivated, with a passivation film thickness of 5-8 μm and a surface roughness Ra≤1.6 μm.

[0012] Beneficial effects: Improves the corrosion resistance and surface smoothness of mechanical structures, reduces frictional wear, and extends service life.

[0013] Furthermore, the bushing adopts a solid lubricating coating structure, the coating material is polytetrafluoroethylene, and the coating thickness is 0.1-0.3mm.

[0014] Beneficial effects: Provides stable self-lubricating effect, avoids oil leakage and drying problems that are prone to occur in traditional lubrication methods, and further improves the wear resistance of the connecting pair.

[0015] Furthermore, the drive motor is a DC110V permanent magnet synchronous motor with a rated power of 120-150W and a protection level of not less than IPX5.

[0016] Beneficial effects: It is compatible with the power supply system of rail vehicles, ensuring sufficient power output, and the protection level meets the needs of use in complex outdoor environments.

[0017] Furthermore, the worm gear reducer is integrated with the drive motor and fixed by 4-6 M8-M10 hexagonal bolts with a bolt tightening torque of 23-30 N·m.

[0018] Beneficial effects: Improves the connection between the drive motor and the reduction gear, ensures precise and efficient power transmission, and prevents loosening during operation.

[0019] Furthermore, the clearance between the two ends of the connecting rod and the self-lubricating connecting pair is 0.05-0.1mm, and the fit tolerance grade is H8 / f7.

[0020] Beneficial effects: Ensures smooth and uninterrupted movement of the connecting parts, while avoiding transmission shock and noise caused by excessive gaps.

[0021] Furthermore, the mating length between the main shaft and the bushing is 30-40mm, and the inner wall of the bushing is provided with lubrication grooves distributed along the axial direction, with 4-6 lubrication grooves, a groove width of 2-3mm, and a groove depth of 1-1.5mm.

[0022] Beneficial effects: Stores self-lubricating medium, prolongs lubrication time, and further improves the wear resistance and service life of the connecting parts.

[0023] Furthermore, the drive assembly also includes a waterproof sleeve and a locking nut. The waterproof sleeve is fitted onto the outside of the shaft assembly, and the threaded connection between the locking nut and the shaft assembly is coated with thread-locking adhesive with a shear strength ≥15MPa.

[0024] Beneficial effects: Improves the sealing and waterproofing performance of the drive assembly, prevents moisture and dust from entering and corroding internal components, and enhances the anti-loosening reliability of threaded connections.

[0025] The advantages of this utility model are: 1. High maintenance-free: Self-lubricating connecting pairs (including oil bearings or solid lubricating coatings) do not require regular oiling, which greatly reduces operation and maintenance costs and labor hours, and is suitable for the long-term stable operation needs of rail vehicles; 2. High reliability: The elastic retaining ring for the shaft is designed with precise dimensions and preload to reliably fix the main shaft, effectively preventing loosening and falling off under high-frequency reciprocating motion and eliminating safety hazards; 3. Excellent corrosion and wear resistance: The 304 stainless steel material, combined with passivation treatment, significantly improves the mechanical structure's resistance to corrosion and mechanical wear in complex environments, extending the service life of the drive assembly; 4. Stable transmission efficiency: The self-lubricating connecting pairs, with their reasonable fit clearance and lubrication groove design, ensure that the transmission mechanism moves flexibly without jamming, and that power transmission is precise and efficient, reducing drive energy consumption; 5. Effective sealing and protection: The waterproof sleeve works in conjunction with the threaded locking adhesive to improve the sealing and waterproof performance of the drive assembly, preventing internal components from being corroded by moisture and dust, and further reducing the failure rate. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0027] Figure 2 This is a schematic diagram of the structure from another perspective of an embodiment of the present utility model.

[0028] The reference numerals in the accompanying drawings include: drive motor 1, crank assembly 2, connecting rod 3, spherical bearing 4, shaft assembly 5, shaft retaining ring 6, and worm gear reducer 7. Detailed Implementation

[0029] The following detailed description illustrates the specific implementation method: like Figure 1 and Figure 2 As shown, the self-lubricating, maintenance-free wiper drive assembly includes a drive motor 1, a transmission mechanism, a shaft assembly 5, and an anti-detachment structure. The transmission mechanism includes a crank assembly 2, a connecting rod 3, and a spherical bearing 4. The spherical bearing 4 and the bushing form a self-lubricating connection pair. The bushing adopts a solid lubricating coating structure, with the coating material being polytetrafluoroethylene and a coating thickness of 0.1-0.3 mm. This provides a stable self-lubricating effect, avoiding the oil leakage and drying problems that are prone to occur in traditional lubrication methods, and further improving the wear resistance of the connection pair.

[0030] The anti-detachment structure includes a shaft elastic retaining ring 6 installed on the main unit's rotating shaft. The cross-sectional diameter of the shaft elastic retaining ring 6 is 2-3mm, and its inner diameter is 1-1.5mm smaller than the shoulder diameter of the main unit's rotating shaft. The preload after assembly is 50-80N. Through precise dimensional and preload design, the reliability of the elastic retaining ring's fixation to the rotating shaft is ensured, effectively preventing the rotating shaft from loosening and detaching under high-frequency movement.

[0031] The crank assembly 2, connecting rod 3, and shaft assembly 5 are all made of 304 stainless steel. The surface of the 304 stainless steel mechanical structure is passivated, with a passivation film thickness of 5-8 μm and a surface roughness Ra≤1.6 μm. This improves the corrosion resistance and surface smoothness of the mechanical structure, reduces frictional losses, and extends its service life.

[0032] The output end of the drive motor 1 is connected to the crank assembly 2 via a worm gear reducer 7. The two ends of the connecting rod 3 are hinged to the crank assembly 2 and the shaft assembly 5 respectively via self-lubricating connecting pairs. The spherical bearing 4 of the self-lubricating connecting pair is an oil-impregnated bearing with an oil content of 20-30%, and a continuous maintenance-free operation cycle of no less than 8000 hours. Clearly defining the core parameters of the oil-impregnated bearing ensures the long-lasting self-lubricating effect of the connecting pair, meeting the maintenance-free requirements for long-term operation of rail vehicles.

[0033] The drive motor 1 is a DC 110V permanent magnet synchronous motor with a rated power of 120-150W and a protection level of not less than IPX5. It is compatible with the power supply system of rail vehicles to ensure sufficient power output, and the protection level meets the requirements for use in complex outdoor environments.

[0034] The worm gear reducer 7 is integrated with the drive motor 1 and secured by 4-6 M8-M10 hexagonal bolts with a tightening torque of 23-30 N·m. This improves the connection between the drive motor 1 and the reducer, ensuring precise and efficient power transmission and preventing loosening during operation.

[0035] The clearance between the two ends of the connecting rod 3 and the self-lubricating connecting pair is 0.05-0.1mm, with a tolerance grade of H8 / f7. This ensures that the connecting pair moves smoothly without jamming, while avoiding transmission shock and noise caused by excessive clearance.

[0036] The mating length between the main shaft and the bushing is 30-40mm. The inner wall of the bushing is provided with 4-6 lubrication grooves distributed along the axial direction, with a groove width of 2-3mm and a groove depth of 1-1.5mm. These grooves store self-lubricating medium, extending lubrication time and further improving the wear resistance and service life of the connection pair.

[0037] The drive assembly also includes a waterproof sleeve and a locking nut. The waterproof sleeve is fitted onto the outside of the shaft assembly 5, and the threaded connection between the locking nut and the shaft assembly 5 is coated with thread-locking adhesive with a shear strength ≥15MPa. This improves the sealing and waterproof performance of the drive assembly, preventing moisture and dust from entering and corroding internal components, while also enhancing the reliability of the threaded connection against loosening.

[0038] This utility model achieves maintenance-free operation through a self-lubricating connecting pair, uses an elastic retaining ring 6 on the shaft to prevent the shaft from falling off, and uses 304 stainless steel to improve corrosion and wear resistance. The three work together to ensure the stable and reliable operation of the drive assembly.

[0039] The differences and advantages of this utility model compared with prior art documents and conventional techniques are as follows: (1) Differences and advantages compared with the prior art CN203381597U The prior art document CN203381597U discloses a flange-type electric wiper device for locomotives and rolling stock. Its drive mechanism includes a fixed rod frame assembly, a connecting rod 3 assembly, a crank assembly 2, etc., and is connected by a spherical bearing 4 and fixed by an elastic retaining ring 6 for the shaft. However, it does not involve the design of a self-lubricating structure and corrosion-resistant materials.

[0040] The difference between this utility model and the prior art document is as follows: 1. Different lubrication structures: The spherical bearing 4 in the comparative document requires regular lubrication and maintenance, while this utility model adopts a self-lubricating connection pair with an oil-impregnated bearing or a solid lubrication coating, achieving maintenance-free operation throughout its entire life cycle; 2. Different material selection: The prior art does not specify the material of the mechanical structure, but this utility model clearly uses 304 stainless steel and has been passivated, which has a corrosion resistance and wear resistance far exceeding that of ordinary steel. 4. Differences in detailed design: This utility model has made precise parameter designs for the size, preload, fit clearance, and lubrication groove of the elastic retaining ring 6 for the shaft, while the comparative document only mentions the structural composition and does not involve the optimization of key parameters.

[0041] 5. Advantages: This utility model is superior to the prior art in terms of maintenance-free operation, corrosion and wear resistance, and structural reliability. It can better meet the needs of long-term high-frequency operation of As type rail vehicles and reduce maintenance costs.

[0042] (2) Differences and advantages from conventional techniques in this field In the conventional techniques used in this field, the connecting parts of the wiper drive assembly require regular lubrication, the shaft fixing structure is simple, and the mechanical structure is made of ordinary steel, resulting in problems such as frequent maintenance, low reliability, and short lifespan.

[0043] The advantages of this utility model are: 1. Self-lubricating innovative design: Breaking through the traditional lubrication method, it adopts self-lubricating connection pairs with oil-impregnated bearings or solid lubrication coatings, completely solving the pain point of regular oiling maintenance; 2. Optimized anti-drop structure: Through the precise parameter design of the shaft elastic retaining ring 6, the shaft is reliably fixed, and the anti-drop effect is more stable compared with the commonly used simple retaining ring structure; 3. Material upgrade: Made of 304 stainless steel with passivation treatment, it has more than 50% better corrosion and wear resistance than ordinary steel, significantly extending the service life of the drive assembly.

[0044] The specific implementation process is as follows: This embodiment is designed for As-type rail vehicles, and the specific structure of the self-lubricating, maintenance-free windshield wiper drive assembly is as follows: Drive motor 1: adopts a DC110V permanent magnet synchronous motor with a rated power of 130W and a protection level of IPX5, which meets the power supply requirements of rail vehicles and the requirements of outdoor environment use; Self-lubricating connection pair: The spherical plain bearing 4 is an oil-impregnated bearing with an oil content of 25%. The bushing is coated with a polytetrafluoroethylene solid lubricant with a coating thickness of 0.2 mm, a clearance of 0.08 mm, and a tolerance grade of H8 / f7. The inner wall of the bushing is provided with 5 axial lubrication grooves, each with a width of 2.5 mm and a depth of 1.2 mm, for storing lubricating medium. Anti-drop structure: The shaft uses a 6-section elastic retaining ring with a diameter of 2.5mm. Its inner diameter is 1.2mm smaller than the diameter of the main shaft shoulder. After assembly, the pre-tightening force is 65N. It is precisely installed on the main shaft through the slot to achieve reliable anti-drop. Mechanical structure: Crank assembly 2, connecting rod 3 and shaft assembly 5 are all made of stainless steel 304, with passivation treatment on the surface. The passivation film thickness is 6μm and the surface roughness Ra=1.2μm. Other structures: The worm gear reducer 7 is fixed to the drive motor 1 by 5 M9 hex bolts with a tightening torque of 25 N·m; a waterproof sleeve is fitted on the outside of the shaft assembly 5, and the threaded connection between the lock nut and the shaft assembly 5 is coated with thread-locking adhesive with a shear strength of 18 MPa to improve the sealing and anti-loosening effect.

[0045] (3) Effects of the Example Maintenance-free effect: The self-lubricating connection can operate continuously without maintenance for up to 9,000 hours, far exceeding the 3,000-hour maintenance cycle of existing drive assemblies. No regular lubrication is required, reducing operation and maintenance costs by more than 60%. Anti-fall reliability: After 100,000 high-frequency reciprocating motion tests, the axle elastic retaining ring 6 showed no loosening or deformation, the main shaft was firmly fixed, and there was no risk of falling off, meeting the safety requirements for long-term operation of rail vehicles; Corrosion and wear resistance: After 5000 hours of aging test in a complex environment simulating humidity and dust, the mechanical structure made of stainless steel 304 showed no obvious corrosion marks, and the wear amount was ≤0.02mm, which increased the service life of the drive assembly by 80% compared with ordinary steel. Transmission stability: The drive assembly operates without any jamming or abnormal noise, and the transmission efficiency remains above 95%. The output speed of drive motor 1 is stable, ensuring that the wiper wiping frequency is uniform and consistent. Sealing and protection effect: After passing the IPX5 waterproof test and dust test, no moisture or dust intrusion was found inside the drive assembly, the electrical components and mechanical connections operated normally, and the failure rate was reduced by 70%.

[0046] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A self-lubricating, maintenance-free windshield wiper drive assembly, characterized in that: The device includes a drive motor, a transmission mechanism, a shaft assembly, and an anti-detachment structure. The transmission mechanism includes a crank assembly, a connecting rod, and a spherical bearing, with the spherical bearing and bushing forming a self-lubricating connection pair. The anti-detachment structure includes a shaft elastic retaining ring installed on the main unit's rotating shaft. The crank assembly, connecting rod, and shaft assembly are all made of 304 stainless steel. The output end of the drive motor is connected to the crank assembly via a worm gear reducer, and both ends of the connecting rod are hinged to the crank assembly and shaft assembly respectively via a self-lubricating connection pair.

2. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The spherical bearing of the self-lubricating connection pair is an oil-impregnated bearing with an oil content of 20-30% and a continuous maintenance-free operation cycle of not less than 8000 hours.

3. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The cross-sectional diameter of the elastic retaining ring for the shaft is 2-3mm, and its inner diameter is 1-1.5mm smaller than the shoulder diameter of the main shaft. The preload after assembly is 50-80N.

4. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The surface of the mechanical structure made of stainless steel 304 is passivated, with a passivation film thickness of 5-8μm and a surface roughness Ra≤1.6μm.

5. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The bushing adopts a solid lubricating coating structure, the coating material is polytetrafluoroethylene, and the coating thickness is 0.1-0.3mm.

6. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The drive motor is a DC110V permanent magnet synchronous motor with a rated power of 120-150W and a protection level of not less than IPX5.

7. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The worm gear reducer is integrated with the drive motor and is fixed by 4-6 M8-M10 hexagonal bolts with a bolt tightening torque of 23-30 N·m.

8. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The clearance between the two ends of the connecting rod and the self-lubricating connecting pair is 0.05-0.1mm, and the fit tolerance grade is H8 / f7.

9. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The mating length between the main shaft and the bushing is 30-40mm. The inner wall of the bushing is provided with lubrication grooves distributed along the axial direction. There are 4-6 lubrication grooves, with a groove width of 2-3mm and a groove depth of 1-1.5mm.

10. The self-lubricating, maintenance-free wiper drive assembly according to claim 1, characterized in that: The drive assembly also includes a waterproof sleeve and a locking nut. The waterproof sleeve is fitted onto the outside of the shaft assembly, and the threaded connection between the locking nut and the shaft assembly is coated with thread-locking adhesive with a shear strength ≥15MPa.

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