Fatigue test device for speed reducer single body of driving assembly
By introducing a bench transition plate and auxiliary bearing support into the drive assembly, the problems of axial movement and tooth side impact at the spline connection between the drive shaft and the reducer were solved, enabling efficient fatigue testing of the reducer and improving the reliability and safety of the test.
Patent Information
- Application Number
- CN202520040193.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-08
AI Technical Summary
In existing drive assembly testing, axial movement and tooth flank impact are prone to occur at the spline connection between the drive shaft and the reducer input shaft, resulting in increased noise, spline wear, and wear of the internal gears of the reducer, affecting the reliability and safety of the test.
A fatigue testing device for a single reducer of a drive assembly was designed. The device is coaxially fixed to the front housing of the reducer via a transition plate on the test bench. One end of the drive shaft is connected to the input motor on the test bench, and the other end is splined to the input shaft of the reducer. The device is supported and positioned by auxiliary bearings to reduce the axial movement and radial vibration of the drive shaft and improve its coaxiality.
It effectively reduces the impact and wear of the drive shaft on the reducer, reduces noise and spline wear, and improves the reliability and safety of the reducer in fatigue testing.
Smart Images
Figure CN223611116U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a reducer monomer fatigue test device of drive assembly for the fatigue test of reducer in drive assembly. BACKGROUND
[0002] The all-in-one drive assembly of new energy vehicle includes motor, controller and reducer, with the higher and higher requirement for the power density of drive assembly, integration is more and more important, the integration of motor in the reducer front shell to save motor shell is an important measure to improve the integration of assembly, and the current test of all-in-one drive assembly generally adopts the separate mode of motor and reducer offline test, that is, the motor assembly line is tested by the electric parameter and mechanical performance of the motor on the towing test bench, and the fatigue performance of the reducer assembly line is tested by the test bench. The output shaft length of the test bench input motor is not enough, and the reducer monomer integrated with the motor in the reducer front shell cannot pass through the reducer front shell and the input shaft of the reducer to form spline connection, such as connecting the extension shaft with the input shaft spline of the reducer on the output shaft of the test bench input motor, the spline fit between the extension shaft and the input shaft of the reducer bears axial and radial load, axial movement and tooth side impact between the inner and outer splines are formed in the test process, which not only increases the noise in the test process and spline wear, but also forms impact on the gears of the reducer, accelerating the wear of the gears. SUMMARY
[0003] The reducer monomer fatigue test device of drive assembly provided by the utility model reduces the impact of transmission shaft on the reducer in the test process, reduces the wear of gears in the reducer in the test process, reduces the spline load and tooth side impact between the transmission shaft and the input shaft of the reducer, reduces the noise and spline wear in the test process, and improves the reliability and safety of the reducer unit fatigue test.
[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:
[0005] The reducer monomer fatigue test device of drive assembly is characterized by comprising a test bench transition plate connected with the test bench and coaxially fixed on the end face of the reducer front shell, a transmission shaft spline-connected with the test bench input motor on the test bench, the transmission shaft being spline-connected with the input shaft of the reducer through the reducer front shell and the test bench transition plate, and the transmission shaft being supported and positioned on the test bench transition plate by an auxiliary bearing.
[0006] Preferably, the transmission shaft is provided with a shaft shoulder and a positioning bushing, the inner ring of the auxiliary bearing is press-fitted on the transmission shaft, the inner end of the inner ring of the auxiliary bearing abuts against the shaft shoulder, and the outer end of the inner ring abuts against the positioning bushing.
[0007] Preferably, the transmission shaft is provided with a threaded segment with external threads, a locking nut is assembled on the threaded segment, a positioning bush is gap fitted on the transmission shaft and located at the inner side of the locking nut, the outer end of the positioning bush is provided with an outwardly folded edge folded outwardly by 90 degrees, and the locking nut abuts against the outwardly folded edge.
[0008] Preferably, the bench transition plate is provided with an inner hole corresponding to the auxiliary bearing, the inner hole is provided with an annular positioning surface, the outer ring of the auxiliary bearing is press fitted in the inner hole and the outer end of the outer ring of the auxiliary bearing abuts against the annular positioning surface, and a bearing cover plate is fixed on the inner end surface of the bench transition plate and the inner end of the outer ring of the auxiliary bearing abuts against the bearing cover plate.
[0009] Preferably, the transmission shaft is composed of a spline segment one connected with the input shaft of the speed reducer, a spline segment two connected with the input motor of the bench, and an intermediate segment arranged between the spline segment one and the spline segment two, the outer diameters of the spline segment one and the spline segment two are smaller than the outer diameter of the intermediate segment, and a shaft shoulder is arranged on the intermediate segment.
[0010] The drive assembly of the utility model has the advantages of:
[0011] The drive assembly of the utility model has the advantages of: BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 The drive assembly of the utility model has the advantages of:
[0013] Figure 2 The drive assembly of the utility model has the advantages of: Figure 1 The drive assembly of the utility model has the advantages of: DETAILED DESCRIPTION
[0014] The drive assembly of the utility model has the advantages of: Figures 1-2 The drive assembly of the utility model has the advantages of:
[0015] The application discloses a fatigue test device for a reducer unit of a driving assembly, which is characterized in that the device comprises a bench transition plate 2 connected with a test bench and coaxially fixed on the end face of a reducer front shell 1, a transmission shaft 3 connected with a bench input motor through a spline on the test bench, and the transmission shaft 3 is connected with a reducer input shaft 4 through a spline and supported and positioned on the bench transition plate 2 through an auxiliary bearing 5.
[0016] The fatigue test device for the reducer unit of the driving assembly is characterized in that the bench transition plate 2 is connected with the test bench and coaxially fixed on the end face of the reducer front shell 1, one end of the transmission shaft 3 is connected with the bench input motor, the other end is connected with the reducer input shaft 4 through a spline, the power of the bench input motor is transmitted to the reducer, the reducer is driven to run to form the fatigue test of the reducer, the auxiliary bearing 5 is used to position the transmission shaft 3 to reduce the axial movement of the transmission shaft during the transmission process, thereby reducing the impact of the transmission shaft 3 on the reducer during the test process, reducing the wear of the gears at all levels in the reducer during the test process, the auxiliary bearing 5 is used to position the transmission shaft 3 to reduce the radial vibration of the transmission shaft during the transmission process, the auxiliary bearing 5 is used to support the transmission shaft, the coaxiality of the transmission shaft is improved, the transmission shaft is arranged along the central axis, thereby reducing the spline bearing and the tooth side impact between the transmission shaft 3 and the reducer input shaft 4, reducing the noise and the wear of the spline during the test process, and improving the reliability and safety of the unit fatigue test of the reducer.
[0017] The transmission shaft 3 is provided with a shaft shoulder 31 and a positioning bush 32, the inner ring of the auxiliary bearing 5 is press-fitted on the transmission shaft 3, the inner end of the inner ring of the auxiliary bearing 5 abuts against the shaft shoulder 31, and the outer end of the inner ring of the auxiliary bearing 5 abuts against the positioning bush 32. The inner ring of the auxiliary bearing 5 is axially positioned through the shaft shoulder 31 and the positioning bush 32, and the axial positioning of the auxiliary bearing 5 and the transmission shaft 3 is formed.
[0018] The transmission shaft 3 is provided with a threaded section 33 with external threads, the threaded section 33 is assembled with a locking nut 6, the positioning bush 32 is gap-fitted on the transmission shaft 3 and located on the inner side of the locking nut 6, the outer end of the positioning bush 33 is provided with an outwardly folded 90-degree outward flange 34, and the locking nut 6 abuts against the outward flange 34. The positioning reliability of the auxiliary bearing 5 on the transmission shaft 3 is ensured through the locking nut 6 pushing the positioning bush 32 against the outer end of the inner ring of the auxiliary bearing 5, the contact area of the locking nut 6 and the positioning bush 33 is increased through the outward flange 34, and the positioning reliability of the positioning bush 32 is improved.
[0019] The inner hole 21 corresponding to the auxiliary bearing 5 is arranged on the bench transition plate 2, the annular positioning surface 22 is arranged in the inner hole 21, the outer ring of the auxiliary bearing 5 is pressed into the inner hole 21, and the outer end of the outer ring of the auxiliary bearing 5 abuts against the annular positioning surface 22; the bearing cover plate 7 is fixed on the inner end surface of the bench transition plate 2, and the inner end of the outer ring of the auxiliary bearing 5 abuts against the bearing cover plate 7. The outer ring of the auxiliary bearing 5 is axially positioned through the annular positioning surface 22 and the bearing cover plate 7, the axial positioning of the auxiliary bearing 5 and the bench transition plate 2 is formed, and the rotating shaft 3 is supported and positioned on the bench transition plate 2 through the auxiliary bearing 5. The motor is not assembled in the reducer front shell 1, the position of assembling the motor in the reducer front shell 1 is a cavity, when the reducer single-body fatigue test device of the driving assembly is assembled to the reducer, the auxiliary bearing 5 needs to be pressed into the bench transition plate 2 first, then the bearing cover plate 7 is fixed on the inner end surface of the bench transition plate 2, then the auxiliary bearing 5 is pressed into the transmission shaft 3, then the transmission shaft 3 is inserted through the reducer front shell 1 and matched with the inner spline of the reducer input shaft 4, then the positioning bushing 32 and the locking nut 6 are sequentially sleeved on the transmission shaft 3, finally, the test bench is spline-connected with the transmission shaft 3, and the bench transition plate 2 is connected to the test bench, after the assembly is completed, the test bench input motor on the test bench is started to drive the reducer to run, and the fatigue test of the reducer is formed.
[0020] The transmission shaft 3 is composed of the spline segment one 8 spline-connected with the reducer input shaft 4, the spline segment two 9 spline-connected with the test bench input motor and the middle segment 10 arranged between the spline segment one 8 and the spline segment two 9, the outer diameters of the spline segment one 8 and the spline segment two 9 are smaller than the outer diameter of the middle segment 10, and the shaft shoulder 31 is arranged on the middle segment 10. The outer diameter of the middle segment 10 is larger than the outer diameters of the spline segment one 8 and the spline segment two 9, the outer diameter of the middle segment 10 is the largest, the rigidity and the carrying capacity of the transmission shaft 3 are improved, the bending deformation rate of the middle segment 10 is reduced, the coaxiality of the transmission shaft 3 is improved, and the transmission reliability is improved.
[0021] The technical scheme of the embodiment of the utility model is completely described in combination with the drawings, and it should be noted that the described embodiment is only a part of the embodiment of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
Claims
1. A device for testing the fatigue of a reducer unit of a drive assembly, characterized in that: The transmission shaft is supported and positioned on the test bench transition plate by an auxiliary bearing.
2. The fatigue test apparatus for a reduction gear unit of a drive assembly according to claim 1, characterized by: The inner ring of the auxiliary bearing is press-fitted on the transmission shaft, and the inner end of the inner ring abuts against the shaft shoulder, and the outer end of the inner ring abuts against the positioning bushing.
3. The fatigue testing apparatus for a speed reducer unit of a drive assembly according to claim 2, characterized in that: The transmission shaft is provided with a threaded segment with external threads, and a locking nut is assembled on the threaded segment.
4. The fatigue testing apparatus for a speed reducer unit of a drive assembly according to claim 3, characterized in that: The test bench transition plate is provided with an inner hole corresponding to the auxiliary bearing, and an annular positioning surface is arranged in the inner hole.
5. The fatigue testing apparatus for a speed reducer unit of a drive assembly according to claim 2, characterized by: The transmission shaft is composed of a spline segment one connected with the input shaft of the reducer by spline, a spline segment two connected with the input motor of the test bench by spline, and an intermediate segment arranged between the spline segment one and the spline segment two.