Rotor pump driving mechanism

Abstract

The utility model discloses a rotor pump driving mechanism, which relates to the technical field of new energy truck speed reducers, and comprises a gear shaft, the gear shaft is provided with an internal oil duct, the end part of the internal oil duct is provided with a driving plug which is in radial interference fit with the internal oil duct, and the other side of the driving plug is provided with a plug groove and is connected with a cycloid rotor driving shaft in a matched manner; one end of the cycloid rotor driving shaft is provided with a driving shaft protrusion matched with the blocking groove, the other end of the cycloid rotor driving shaft is provided with a driving shaft groove, the circumferential side of the cycloid rotor driving shaft is provided with a cycloid inner rotor and an oil pump gland, and the cycloid rotor driving shaft is in interference fit with the cycloid inner rotor in the radial direction. The utility model provides a rotor pump driving mechanism which is simple and compact in structure and compact and reliable in rotor pump driving and power transmission.

Description

Technical Field

[0001] This utility model relates to the field of new energy truck reducer technology, specifically to a rotor pump drive mechanism. Background Technology

[0002] With the rapid development of the new energy truck industry, the market has placed higher demands on the performance and efficiency of vehicle transmission systems. Particularly in the area of ​​reducer transmission mechanisms, there is an increasing emphasis on the simplicity of design and the compactness of structure, aiming to improve the overall system reliability and ease of maintenance by simplifying mechanical construction. Simultaneously, for systems using rotary pumps as the power transmission method, it is not only necessary to ensure stable and reliable power transmission under high load conditions, but also to optimize the design to achieve a more compact power layout, thereby adapting to the limited installation space of new energy trucks. This design philosophy helps improve energy efficiency, reduce failure points, and provide stronger and more durable power support for new energy trucks, meeting the multiple demands of the modern transportation industry for environmental protection, economy, and ease of operation. Therefore, developing reducer transmission mechanisms that meet the above characteristics and possess high reliability has become one of the important directions in current new energy truck technology research and development. Utility Model Content

[0003] Technical problem to be solved by the utility model

[0004] The technical problem to be solved by this utility model is to provide a rotor pump drive mechanism with a simple and compact structure, and a compact and reliable rotor pump drive power transmission mechanism.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] A rotary pump drive mechanism includes a gear shaft with an internal oil passage. The end of the internal oil passage has a radially interference-fitted drive plug. The other side of the drive plug has a plug groove and is connected to a cycloidal rotor drive shaft. One end of the cycloidal rotor drive shaft has a drive shaft protrusion that mates with the plug groove, and the other end has a drive shaft groove. A cycloidal inner rotor and an oil pump cover are located around the cycloidal rotor drive shaft, and the cycloidal rotor drive shaft and the cycloidal inner rotor have a radial interference fit.

[0008] As the core component of the entire transmission system, the gear shaft not only transmits power but also contains an internal oil passage. This internal oil passage facilitates the flow of lubricating oil or coolant, ensuring lubrication and cooling of the entire transmission system, reducing friction and wear, and extending service life. The drive plug is located at one end of the internal oil passage on the gear shaft and is connected with it using a radial interference fit. This method ensures the sealing of the oil passage, preventing lubricating oil or coolant leakage, and also increases the stability of the overall structure. The other side of the drive plug has a plug groove that mates with the drive shaft protrusion at one end of the cycloidal rotor drive shaft. This design helps to accurately position and fix the cycloidal rotor drive shaft, ensuring its stable and reliable operation, while simplifying the assembly process. The cycloidal rotor drive shaft is one of the parts in the entire device responsible for directly transmitting power. One end is connected to the drive plug via the drive shaft protrusion, and the other end has a drive shaft groove for further connection or installation of other functional components. The radial interference fit between the cycloidal rotor drive shaft and the inner cycloidal rotor ensures a tight mechanical connection and improves power transmission efficiency. The cycloidal inner rotor surrounds the cycloidal rotor drive shaft, and the radial interference fit between them ensures efficient power transmission. The oil pump gland serves to protect and seal the internal components, ensuring their proper functioning and helping to maintain the pressure balance of the entire system.

[0009] Alternatively, the blocking groove can be a slotted groove, and the drive shaft protrusion can be a protrusion.

[0010] The slotted design simplifies the connection between the cycloidal rotor drive shaft and the drive plug, making the assembly process more direct and efficient. The slot provides a simple and effective method for positioning and securing the cycloidal rotor drive shaft, ensuring accurate installation and reducing assembly errors. A corresponding slotted protrusion is located at one end of the cycloidal rotor drive shaft to mate with the slot on the drive plug. This design ensures a tight and secure connection between the two, improving assembly efficiency and enhancing the overall strength and reliability of the structure.

[0011] Alternatively, the drive shaft groove can be a slotted groove and parallel to the blocking groove.

[0012] Assembly consistency: The parallel arrangement of the two slots helps ensure that all components are installed in the intended design direction during assembly, reducing the possibility of incorrect installation.

[0013] Force distribution: When subjected to external forces, a parallel design can help distribute these forces more evenly, thereby reducing local stress concentration and increasing the overall strength and durability of the structure.

[0014] Ease of manufacturing: From a manufacturing perspective, parallel groove designs are generally easier to process because they follow the same reference line, which can reduce manufacturing costs and improve production efficiency.

[0015] Optionally, a cycloidal outer rotor is provided on the outer periphery of the inner rotor and is engaged by teeth.

[0016] The cycloidal inner rotor is one of the core components located within the mechanism, driven by an eccentrically mounted drive shaft. Its external profile consists of a series of curves of specific shapes, typically designed based on cycloidal geometry, effectively converting input rotational motion into output power. The cycloidal outer rotor surrounds the inner rotor, and the two mesh with each other through a special tooth profile. The internal tooth profile of the outer rotor matches the external tooth profile of the inner rotor, ensuring tight meshing and efficient power transmission.

[0017] Optionally, the inner rotor of the cycloid is eccentrically connected to the outer rotor of the cycloid.

[0018] Eccentric couplings allow designers to achieve high reduction ratios or pumping efficiencies within limited space, making them ideal for applications requiring compact designs, such as powertrain systems in modern vehicles like new energy trucks.

[0019] Optionally, the head of the drive shaft protrusion and the bottom of the blocking groove are both provided with rounded corners.

[0020] Rounded corners effectively disperse localized stress, preventing material fatigue or fracture caused by stress concentration. Especially under high load conditions, rounded corners reduce stress at sharp edges, increasing component durability. The rounded corner design makes it easier for drive shaft protrusions to insert into the plug slot, reducing frictional resistance and potential damage risks during assembly, thus improving assembly efficiency and safety. Rounded corner treatment reduces wear from direct contact, especially when there is relative movement between components; the smooth transition area helps reduce the coefficient of friction, thereby extending service life.

[0021] Optionally, the cycloidal rotor drive shaft is provided with a housing.

[0022] The housing provides essential physical protection for the cycloidal rotor drive shaft and its related components (such as the inner and outer cycloidal rotors), preventing dust, moisture, and other contaminants from entering the system and thus avoiding unnecessary wear and malfunctions. In addition to environmental factors, the housing also provides mechanical protection against external impacts or collisions that could damage internal precision components, ensuring long-term stable operation.

[0023] Optionally, the housing has a cavity on the outer periphery of the rotor within the cycloid.

[0024] The cavity serves as a storage space for lubricating oil, ensuring that the contact surfaces between the inner and outer rotors of the cycloidal system are always adequately lubricated. This helps reduce friction, decrease wear, and improve the efficiency and lifespan of the entire transmission system. The cavity can also be used to temporarily store or guide the flow of lubricating oil, ensuring effective lubrication of all critical components. By incorporating the cavity, the contact area between the lubricating oil and the inner wall of the housing is increased, thereby improving heat exchange efficiency and helping to quickly dissipate internally generated heat, maintaining a suitable operating temperature.

[0025] Beneficial effects

[0026] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0027] The technical solution provided by this utility model improves the stability and reliability of the overall structure by using precision mechanical connection methods such as radial interference fit; secondly, the design of built-in oil passages effectively solves the lubrication and cooling problems and reduces maintenance requirements; finally, the compact design makes the transmission mechanism very suitable for applications with limited space, such as modern transportation tools like new energy trucks. Attached Figure Description

[0028] Figure 1 A cross-sectional structural schematic diagram of a rotor pump drive mechanism proposed for an embodiment of this utility model;

[0029] Figure 2 This is a schematic diagram of the assembly of a cycloidal inner rotor, a cycloidal outer rotor, and a cycloidal rotor drive shaft in a rotor pump drive mechanism according to an embodiment of the present invention.

[0030] 1. Housing; 2. Cycloidal outer rotor; 3. Cycloidal inner rotor; 4. Oil pump cover; 5. Cycloidal rotor drive shaft; 6. Drive blockage; 7. Gear shaft; 8. Internal oil passage; 9. Blockage groove; 10. Drive shaft protrusion; 11. Drive shaft groove. Detailed Implementation

[0031] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0032] Example

[0033] Combined with appendix Figure 1 A rotor pump drive mechanism includes a gear shaft 7, the gear shaft 7 having an internal oil passage 8, the internal oil passage 8 of the gear shaft 7 adopting a spiral progressive flow channel design, and a 30° guide cone angle is provided at the end.

[0034] The end of the internal oil passage 8 is equipped with a radially interference fit drive plug 6, and the interference fit between the drive plug 6 and the gear shaft 7 is 0.025-0.045mm (Φ20 mating surface). The press-fit pressure is 12-15kN, and a 3.5kN axial tensile force test is performed after press-fitting.

[0035] The other side of the drive blockage 6 is provided with a blockage groove 9 and is connected to a cycloidal rotor drive shaft 5. The cycloidal rotor drive shaft 5 is made of 20CrMnTi alloy steel and is integrally forged. The surface of the shaft is carburized to a depth of 0.8-1.2mm.

[0036] One end of the cycloidal rotor drive shaft 5 is provided with a drive shaft protrusion 10 that mates with the blocking groove 9. The drive shaft protrusion 10 adopts an involute transition structure and has a head radius R0.5±0.05mm.

[0037] The plugging groove 9 is a slotted groove, and the drive shaft protrusion 10 is a slotted protrusion. The drive shaft groove 11 is a slotted groove and is parallel to the plugging groove 9. The head of the drive shaft protrusion 10 and the bottom of the plugging groove 9 are both provided with rounded corner structures. The slotted protrusion at the end of the cycloidal rotor drive shaft 5 can be fitted into the slotted groove of the drive plug 6 with clearance fit. The drive plug 6 is radially interference-fitted with the end of the internal oil passage 8 of the gear shaft 7 rotation system.

[0038] The other end of the cycloidal rotor drive shaft 5 is provided with a drive shaft groove 11. The cycloidal rotor drive shaft 5 has a cycloidal inner rotor 3 and an oil pump cover 4 around its periphery. The cycloidal rotor drive shaft 5 and the cycloidal inner rotor 3 are radially interference-fitted. The length of the interference-fit section between the cycloidal rotor drive shaft 5 and the inner rotor is 15mm, and the taper is 1:100.

[0039] Temperature control for heat fitting: The drive shaft is heated to 200±10℃, while the rotor remains at room temperature. A cycloidal outer rotor 2 is located on the outer side of the inner rotor 3, connected by a toothed fit. The inner rotor 3 and outer rotor 2 are eccentrically connected. The tooth profile of the inner rotor 3 is a modified cycloidal shape. The inner tooth profile of the outer rotor uses a quadratic envelope curve, with a tooth flank clearance of 0.03-0.05mm. The drive plug 6 uses a DIN 7 grade interference fit and is surface-nitrided (hardness ≥700HV).

[0040] The cycloidal rotor drive shaft 5 is provided with a housing 1. The housing 1 has a cavity on the outer periphery of the cycloidal inner rotor 3.

[0041] The housing 1 and the oil pump cover 4 provide oil chambers and working spaces for oil suction and pumping for the cycloidal outer rotor 2 and cycloidal inner rotor 3 of the rotary pump. The cycloidal rotor drive shaft 5 is radially interference-fitted with the cycloidal inner rotor 3.

[0042] The driving route is:

[0043] When the gear shaft 7 rotates, it drives the drive block 6 through radial interference fit, drives the cycloidal rotor drive shaft 5 through the fit of the slot and the slot, drives the cycloidal inner rotor 3 through radial interference fit, and finally drives the oil pump of the cycloidal rotor pump to work.

[0044] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rotor pump drive mechanism, characterized in that, The device includes a gear shaft with an internal oil passage. At one end of the internal oil passage is a drive plug with a radial interference fit. On the other side of the drive plug is a plug groove connected to a cycloidal rotor drive shaft. One end of the cycloidal rotor drive shaft has a drive shaft protrusion that mates with the plug groove, and the other end has a drive shaft groove. A cycloidal inner rotor and an oil pump cover are located around the cycloidal rotor drive shaft, and the cycloidal rotor drive shaft and the cycloidal inner rotor are radially interference-fitted.

2. The rotor pump drive mechanism according to claim 1, characterized in that, The blocking groove is a slotted groove, and the drive shaft protrusion is a protruding protrusion.

3. The rotor pump drive mechanism according to claim 2, characterized in that, The drive shaft groove is a slotted groove and is parallel to the blocking groove.

4. The rotor pump drive mechanism according to claim 1, characterized in that, The cycloidal inner rotor is surrounded by a cycloidal outer rotor, which is engaged by teeth.

5. A rotor pump drive mechanism according to claim 4, characterized in that, The inner rotor of the cycloid is eccentrically connected to the outer rotor of the cycloid.

6. A rotor pump drive mechanism according to claim 1, characterized in that, The head of the drive shaft protrusion and the bottom of the blocking groove are both provided with rounded corners.

7. A rotor pump drive mechanism according to any one of claims 1 to 6, characterized in that, The cycloidal rotor drive shaft is provided with a housing.

8. A rotor pump drive mechanism according to claim 7, characterized in that, The housing has a cavity on the outer periphery of the rotor inside the cycloid.

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