Motor shaft spline fit lubricating structure of speed reducer
By designing the lubricating structure of the oil collecting chamber and oil conduction groove in the new energy reducer, the problem of insufficient spline lubrication of the motor shaft is solved, efficient lubrication and heat dissipation is achieved, the structure is simplified, the cost is reduced, and the cost is guaranteed is ensured. Key strength and reducer compactness.
Patent Information
- Application Number
- CN202420463410.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-11
AI Technical Summary
Inadequate spline lubrication of motor shafts in new energy reducers leads to damage to the tooth surface. In the prior art, the lubrication structure is complex, the cost is high, and it is difficult to ensure spline strength and structural compactness.
A lubricating structure is designed to synchronize the oil collection chamber and oil conduction groove with the shell. Splashing oil is collected through the oil collection chamber and introduced into the hollow input shaft through the oil conduction groove, flowing along the shaft wall to the spline position, combined with the throttling bowl The plug prevents oil from flowing back, enabling circulating lubrication and heat dissipation.
Effective lubrication and heat dissipation of motor shaft splines is achieved, the amount of oil flushing is reduced, the structure is simplified, the cost is reduced, and the spline strength and reducer compactness is improved, and the lubrication reliability is improved.
Smart Images
Figure CN222255001U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a motor shaft spline matching lubrication structure of a reducer, belonging to the technical field of lubrication of reducers for new energy vehicles. Background Art
[0002] The common characteristic of new energy reducers is high speed, which is basically above 10,000 rpm. It is very important to fully lubricate the gears and bearings with lubricating oil. The motor shaft and the input shaft in the reducer are driven by splines. Insufficient lubrication of the motor shaft spline position will accelerate the damage of the spline tooth surface and even cause the spline failure. Therefore, high speed brings challenges to the lubrication of the motor shaft spline. Some existing technologies use an annular groove on the side of the spline shaft, and the groove is provided with a number of oil injection holes connected to the spline shaft, which will affect the strength of the spline shaft. In order to ensure the strength requirements of the spline shaft, the corresponding size of the spline shaft must be increased, and it is relatively difficult to groove the inner hole of the spline shaft from a process perspective, and the quality reliability is uncontrollable; others use grease to lubricate the spline or set an oil guide pipe to be introduced into the input shaft to actively lubricate the spline connection part, but the use of grease application requires a complex sealing structure with a matching O-ring, and the cost is high. The grease properties of the grease will be reduced or even deteriorated under the cutting action of the spline; the oil guide pipe has high assembly requirements. During operation, due to the action of centrifugal force, the lubricating oil introduced from the outside by the oil guide pipe to the spline matching position is easily thrown out by the centrifugal force, and the lubrication effect is limited. In addition, the design of the oil guide pipe will affect the compactness of the reducer structure. In order to meet the lubrication and heat dissipation requirements of the spline matching position between the motor shaft and the input shaft in the reducer, a lubrication structure with compact structure and low processing cost needs to be designed. Utility Model Content
[0003] The motor shaft spline matching lubrication structure of the reducer provided by the utility model can realize the introduction of oil into the inner end of the hollow input shaft and flow to the outer end to lubricate the spline, thereby meeting the lubrication and heat dissipation requirements of the spline matching position of the motor shaft and the hollow input shaft in the reducer. The oil collecting chamber and the oil guide groove are synchronously processed and formed with the shell. The structure is simple and the cost is low. The strength of the spline is not reduced, the compactness of the internal structure of the reducer is not affected, and the practicability is high.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] The motor shaft spline-matching lubrication structure of the reducer includes a hollow input shaft of the reducer, and the rear end of the hollow input shaft has an internal spline that matches the motor shaft spline. It is characterized in that: an oil collecting chamber for collecting splashing oil and an oil guide groove that is connected to the oil collecting chamber and guides the oil into the hollow input shaft are provided on the rear housing of the reducer. The oil collecting chamber is located above the hollow input shaft, and the oil guide groove extends into the inner end of the hollow input shaft with clearance fit.
[0006] Preferably, there are two oil collecting chambers, each of which is composed of an upper cavity body that is V-shaped from top to bottom and an oil passageway integrally formed at the lower end of the upper cavity body, and the oil guide groove is located below the oil passageway.
[0007] Preferably, the oil guide groove includes an oil guide rib and an arc-shaped oil guide ring which are arranged below the oil passage and protrude from the inner wall of the rear shell body, the two oil guide ribs are arranged opposite to each other in a V shape, the oil guide ring connects the lower ends of the two oil guide ribs, and the oil guide ring extends into the inner end of the hollow input shaft with a clearance fit.
[0008] Preferably, an oil guide groove along the oil flow direction is provided on the oil guide rib, the oil guide ring and the oil guide rib are integrally formed, and the protruding oil guide rib extends into the inner end of the hollow input shaft.
[0009] Preferably, the hollow input shaft is equipped with a throttling bowl plug that seals with the inner wall of the shaft. The throttling bowl plug is close to the inner end of the hollow input shaft and forms an oil storage area between the throttling bowl plug and the inner end of the hollow input shaft. An oil hole is opened in the center of the throttling bowl plug.
[0010] The beneficial effects of the utility model are:
[0011] The oil collecting chamber and the oil guiding groove are simultaneously processed and formed with the shell body, and the structure is simple and the cost is low, and the strength of the spline is not reduced, and the compactness of the internal structure of the reducer is not affected.
[0012] 2. In order to prevent the oil in the hollow input shaft from flowing back to the inner end and ensure that the oil entering the hollow input shaft can flow smoothly into the spline position, a throttle bowl plug with a seal is installed on the hollow input shaft to form an oil storage area between the inner end of the hollow input shaft and the throttle bowl plug. When the oil height in the oil storage area reaches the height of the oil hole in the throttle bowl plug, the oil will flow through the oil hole to the spline position. The throttle bowl plug is used to prevent the oil that has passed through the throttle bowl plug from flowing back to the inner end, thereby ensuring the reliability of lubrication. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a cross-sectional view of the spline matching lubrication structure of the motor shaft of the reducer in a specific implementation manner.
[0014] Figure 2 It is a plan view schematic diagram of the oil collecting chamber and the oil guiding groove arranged on the rear housing.
[0015] Figure 3 It is a three-dimensional schematic diagram of the oil collecting chamber and the oil guiding groove arranged on the rear housing. DETAILED DESCRIPTION
[0016] Combine the following Figures 1 to 3 The embodiments of the utility model are described in detail.
[0017] The motor shaft spline-matching lubrication structure of the reducer includes a hollow input shaft 1 of the reducer, and the rear end of the hollow input shaft 1 has an internal spline 11 that matches the motor shaft spline. It is characterized in that: an oil collecting chamber 3 for collecting splashing oil and an oil guide groove 4 that is connected to the oil collecting chamber 3 and guides the oil into the hollow input shaft 1 are provided on the rear housing 2 of the reducer. The oil collecting chamber 3 is located above the hollow input shaft 1, and the oil guide groove 4 extends into the inner end of the hollow input shaft 1 with a clearance fit.
[0018] The motor shaft spline matching lubrication structure of the reducer described above is provided with an oil collecting chamber 3 and an oil guiding groove 4 located above the hollow input shaft 1 on the rear housing 2 of the reducer. When the hollow input shaft 1 rotates, the oil splashed upward onto the rear housing 2 is collected in the oil collecting chamber 3, and flows downward to the oil guiding groove 4 under the action of gravity. The oil guiding groove 4 guides the oil into the hollow input shaft 1, and the oil flows along the inner wall of the hollow input shaft 1 to the motor shaft spline position to lubricate and cool the spline, and drips back into the reducer from the spline gap between the motor shaft and the hollow input shaft, forming a circulating lubrication of the motor shaft spline, and realizing the introduction of the oil into the inner end of the hollow input shaft and flowing to the outer end to lubricate the spline, effectively reducing the amount of oil thrown out due to centrifugal force, meeting the lubrication and heat dissipation requirements of the spline matching position of the motor shaft and the hollow input shaft in the matching reducer. The oil collecting chamber and the oil guiding groove are synchronously processed and formed with the housing, with a simple structure and low cost, without reducing the strength of the spline, without affecting the compactness of the internal structure of the reducer, and with high practicality.
[0019] There are two oil collecting chambers 3, which are composed of an upper chamber 31 similar to a V-shape from top to bottom and an oil passage 32 integrally formed at the lower end of the upper chamber 31, and the oil guide groove 4 is located below the oil passage 32. As shown in the figure, the upper chamber in the oil collecting chamber 3 is similar to a V-shape, and the width gradually decreases from bottom to bottom. The oil is collected in the upper chamber and flows downward under the action of gravity. Under the guidance of the upper chamber, it flows into the oil passage 32, and then flows into the oil guide groove 4 through the oil passage 32. The area of the upper chamber 31 is set according to the shape of the inner wall of the rear shell, and the two oil collecting chambers 3 are set separately to increase the amount of oil introduced into the oil guide groove 4 and improve the lubrication reliability.
[0020] The oil guide groove 4 includes an oil guide rib 41 and an arc-shaped oil guide ring 42, which are arranged below the oil passage 32 and protrude from the inner wall of the rear housing 2. The two oil guide ribs 41 are arranged opposite to each other in a V shape. The oil guide ring 42 connects the lower ends of the two oil guide ribs 41, and the oil guide ring 42 extends into the inner end of the hollow input shaft 1 with clearance fit. The oil flowing downward from the oil passage 32 flows into the oil guide ring 42 through the guidance of the oil guide rib 41, and flows from the oil guide ring 42 to the hollow input shaft 1. The oil guide rib 41 allows the oil flowing out of the oil passage 32 to flow quickly into the oil guide ring 42.
[0021] The oil guide rib 41 is provided with an oil guide groove 411 along the oil flow direction, and the oil guide ring 42 is integrally formed with the oil guide rib 41 and protrudes from the oil guide rib 41 to extend into the inner end of the hollow input shaft 1. The oil guide groove 411 is provided on the oil guide rib 41 to increase the flow rate of the oil on the oil guide rib 41, reduce the probability of the oil flowing out laterally from the oil guide rib 41, and improve the oil guide efficiency and reliability. The portion of the oil guide ring 42 protruding from the oil guide rib 41 extends into the inner end of the hollow input shaft 1, forming a connection between the oil guide groove 4 and the hollow input shaft 1, and the oil collected in the oil collecting chamber 3 can effectively flow into the hollow input shaft 1.
[0022] The hollow input shaft 1 is provided with a throttle bowl plug 5 which is sealed with the inner wall of the shaft. The throttle bowl plug 5 is close to the inner end of the hollow input shaft 1 and forms an oil storage area A with the inner end of the hollow input shaft 1. An oil hole is provided in the center of the throttle bowl plug 5. Due to the high-speed rotation of the hollow input shaft 1, the oil entering the hollow input shaft 1 from the inner end may flow back to the inner end in the hollow input shaft 1. In order to prevent the oil in the hollow input shaft 1 from flowing back to the inner end and ensure that the oil entering the hollow input shaft 1 can flow smoothly into the spline position, a throttle bowl plug 5 which is sealed is installed on the hollow input shaft 1, and an oil storage area A is formed between the inner end of the hollow input shaft 1 and the throttle bowl plug 5. When the oil height in the oil storage area A reaches the oil hole height in the throttle bowl plug 5, the oil will flow to the spline position through the oil hole. The throttle bowl plug 5 is used to prevent the oil that has passed through the throttle bowl plug 5 from flowing back to the inner end, thereby ensuring the reliability of lubrication.
[0023] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
Claims
1. A motor shaft spline matching lubrication structure of a reducer comprises a hollow input shaft of the reducer, the rear end of the hollow input shaft has an internal spline matching with the motor shaft spline, and is characterized in that: An oil collecting chamber for collecting splashing oil and an oil guide groove connected with the oil collecting chamber and guiding the oil into the hollow input shaft are arranged on the rear housing of the reducer. The oil collecting chamber is located above the hollow input shaft, and the oil guide groove extends into the inner end of the hollow input shaft with clearance fit.
2. The motor shaft spline matching lubrication structure of the reducer according to claim 1 is characterized in that: There are two oil collecting chambers, which are composed of an upper cavity body which is similar to a V-shape from top to bottom and an oil passageway which is integrally formed at the lower end of the upper cavity body, and the oil guide groove is located below the oil passageway.
3. The motor shaft spline matching lubrication structure of the reducer according to claim 2 is characterized in that: The oil guide groove includes an oil guide rib and an arc-shaped oil guide ring which are arranged below the oil passage and protrude from the inner wall of the rear shell body. The two oil guide ribs are arranged opposite to each other in a V shape. The oil guide ring connects the lower ends of the two oil guide ribs, and the oil guide ring extends into the inner end of the hollow input shaft with a clearance fit.
4. The motor shaft spline matching lubrication structure of the reducer according to claim 3 is characterized in that: The oil guide rib is provided with an oil guide groove along the oil flow direction, the oil guide ring and the oil guide rib are integrally formed, and the protruding oil guide rib extends into the inner end of the hollow input shaft.
5. The motor shaft spline matching lubrication structure of the reducer according to claim 1, characterized in that: The hollow input shaft is provided with a throttling bowl plug which seals with the inner wall of the shaft. The throttling bowl plug is close to the inner end of the hollow input shaft and forms an oil storage area with the inner end of the hollow input shaft. An oil hole is provided in the center of the throttling bowl plug.