High-speed shaft string for high-rotating-speed off-line test bench of new energy automobile

Abstract

The utility model discloses a high-speed shaft string for a high-rotating-speed off-line test bench of a new energy automobile, which relates to the technical field of the high-rotating-speed off-line test bench of the new energy automobile and comprises a high-speed dynamometer, a torque flange, a coupler, a high-speed bearing seat, a telescopic spline and a locking device. The high-speed shaft string provided by the utility model has the highest rotating speed of 15000 rpm and the maximum torque of 200 Nm, so that the high-speed shaft string can be applied to a rack of a high-speed off-line test bench; the inherent frequency and the torsional vibration inherent frequency of the high-speed shaft string avoid a rotating speed interval applied by the high-speed offline test bench, so that the resonance of the shaft string is avoided; and all the connecting flanges are provided with precise dynamic balance adjusting structures, so that the dynamic balance grade G1 can be easily reached.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy automobile's high rotational speed off line test bench technical field, concretely for a kind of new energy automobile's high rotational speed off line test bench with high speed shaft string. BACKGROUND

[0002] With the continuous development of science and technology, the use of electric vehicles in modern society is increasing, and various requirements for electric vehicles are also increasing. With the rapid development of new energy vehicles, the automobile motor is also required to develop towards high performance, high efficiency and high power density, so the upper limit of the driving motor speed is continuously increasing, so the speed requirement of the off-line test bench for new energy vehicles is also higher and higher. The latest test requirement of user requires that the speed can meet 15000rpm and above. Because the high-speed off-line test bench has high automation degree, large data acquisition, high control precision and high vibration requirement standard, it is still difficult to meet the test speed of 15000rpm and above. One of the key components of the high-speed off-line test bench is the high-speed shaft string, which can meet the speed of 15000rpm and above, which is one of the core problems in the prior art. SUMMARY

[0003] The utility model aims at providing a kind of new energy automobile's high rotational speed off line test bench with high speed shaft string, to solve the above-mentioned background art proposed existing high-speed off-line test bench its meet 15000rpm and above test speed still have certain difficulty, wherein as one of the key components of high-speed off-line test bench high-speed shaft string can meet the speed of 15000rpm and above, which is one of the core difficult problems.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of new energy automobile's high rotational speed off line test bench with high speed shaft string, including high-speed dynamometer, torque flange, shaft coupling, high-speed bearing seat, telescopic spline connected coaxially in sequence, the front end of high-speed bearing seat is provided with locking device outside its axle rod.

[0005] Preferably, the high-speed dynamometer includes a horizontally arranged high-speed detection motor, and a motor mounting seat is arranged at each end of the bottom of the shell of the high-speed detection motor. An electric control box is arranged on the top surface of the shell of the high-speed motor, and the electric control box is internally provided with electric control components and is electrically connected with the high-speed detection motor, the torque flange and the high-speed bearing seat.

[0006] Preferably, the torque flange is arranged on the shaft rod of the high-speed detection motor and rotates coaxially with the shaft rod, and a torque sensor is arranged below the torque flange.

[0007] Preferably, the coupling can be selected from a diaphragm coupling, or a bellows coupling, or a ball-cage universal joint.

[0008] Preferably, the high-speed bearing seat is internally provided with an angular contact ball bearing of high-precision grade and is lubricated by grease, and a temperature sensor and a vibration sensor are mounted on the high-speed bearing seat; a rotating flange is arranged on the front end shaft of the high-speed bearing seat, and a plurality of balance holes are uniformly arranged on the outer circular sidewall of the rotating flange, and counterweights can be mounted in the balance holes.

[0009] Preferably, the telescopic spline is mounted at the shaft center of the torque flange and internally provided with a spring;

[0010] Preferably, the locking device is symmetrically arranged on the outer side of the rotating flange in two groups, and each group of the locking device comprises a locking support arranged on the front side of the high-speed bearing seat, a locking cylinder is arranged on the locking support, and a locking block is arranged at the front end of the piston shaft of the locking cylinder.

[0011] Preferably, the high-speed dynamometer is provided with a connecting flange at the front end, and a plurality of dynamic balance holes are arranged on the flange, a plurality of dynamic balance holes are arranged on the torque flange, a plurality of dynamic balance holes are arranged on the connecting flanges on both sides of the coupling, and a plurality of balance holes are uniformly arranged on the outer circular sidewall of the rotating flange, and counterweights can be mounted in the dynamic balance holes and the balance holes.

[0012] Preferably, the high-speed shaft string is connected with an electric control system, the electric control system optimizes the parameters of the motor and designs corresponding control logic in the test process through PLC control of the frequency converter.

[0013] Preferably, the telescopic spline can compensate for a centering deviation of 0.03 mm, can satisfy that the maximum torque at the highest speed is 15000 rpm and the maximum torque at low speed is 200 Nm.

[0014] Compared with the prior art, the high-speed shaft string has the advantages that:

[0015] The highest speed of the high-speed shaft string is 15000 rpm, and the maximum torque is 200 Nm, so the high-speed shaft string can be applied to a high-speed off-line test bench; the natural frequency and the torsional vibration natural frequency of the high-speed shaft string avoid the speed range applied to the high-speed off-line test bench, so that the shaft string resonance is avoided; and all the connecting flanges are provided with precise dynamic balance adjustment structures, so that the dynamic balance grade G1 can be easily achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an axonometric view;

[0017] Figure 2 is a front view;

[0018] Figure 3 is Figure 2 enlarged view of A in

[0019] Figure 4 is Figure 2 partial sectional view in

[0020] Figure 5 is a plan view;

[0021] In the figure: high-speed dynamometer-1, high-speed detection motor-11, motor mounting seat-12, electric control box-13,

[0022] torque flange-2, torque sensor-21, coupling-3, high-speed bearing seat-4, rotating flange-41, balance hole-42, telescopic spline-5, locking device-6, locking bracket-61, locking cylinder-62, locking block-63. DETAILED DESCRIPTION

[0023] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the technical scheme in the utility model embodiment is described clearly and completely below in combination with the drawings and specific embodiments.

[0024] Please refer to Figures 1-5 , Figure 1 is an isometric view; Figure 2 is a front view; Figure 3 is Figure 2 enlarged view of A in Figure 4 is Figure 2 partial sectional view in Figure 5 is a plan view.

[0025] The utility model provides a high-speed shaft series for high rotational speed off-line test bench of new energy automobile, including high-speed dynamometer 1, torque flange 2, coupling 3, high-speed bearing seat 4, telescopic spline 5 of coaxial connection in proper order, the front end of high-speed bearing seat 4 is provided with locking device 6 on the outer side of its axle rod.

[0026] The high-speed dynamometer 1 includes horizontally arranged high-speed detection motor 11, and one motor mounting seat 12 is arranged at the bottom of the shell of high-speed detection motor 11 near both ends respectively, and the high-speed detection motor 11 is installed and fixed using bolt; the top surface of the shell of high-speed motor 11 is provided with electric control box 13, and electric control box 13 is built-in electric control component and is electrically connected with high-speed detection motor 11, torque flange 2 and high-speed bearing seat 4 respectively.

[0027] The torque flange 2 is arranged on the shaft rod of the high-speed detection motor 11 and rotates coaxially with the shaft rod, and a torque sensor 21 is arranged below the torque flange 2, so that the torque of the high-speed dynamometer 1 can be measured through the torque flange 2.

[0028] The shaft coupling 3 is used to connect the high-speed dynamometer 1 and the high-speed bearing seat 4, and the shaft coupling 3 can compensate the centering error between the high-speed bearing seat 4 and the high-speed dynamometer 1, so as to reduce the centering requirement and difficulty; the shaft coupling 3 can be a diaphragm coupling, a bellows coupling or a ball cage universal joint, and different universal joints can meet different use requirements.

[0029] The high-speed bearing seat 4 is internally provided with an angular contact ball bearing of high-precision grade, and adopts grease lubrication to realize lifelong maintenance-free; the high-speed bearing seat 4 is further provided with a temperature sensor and a vibration sensor for real-time monitoring of the temperature and vibration state of the bearing; when the high-speed bearing seat 4 has a problem, the temperature and vibration values will be reflected in the first time, and the system will set an alarm value for over-temperature or over-vibration to issue an alarm or even stop; the front end shaft rod of the high-speed bearing seat 4 is provided with a rotating flange 41, and a plurality of balance holes 42 are uniformly arranged on the outer circular side wall of the rotating flange 41, and a counterweight can be installed in the balance hole 42 for adjusting the dynamic balance of the high-speed bearing seat 4. The design of the high-speed bearing seat 4 is simulated and calculated strictly to ensure its service life and stability.

[0030] The telescopic spline 5 is installed at the shaft center of the torque flange 2 and internally provided with a spring, and under the action of the spring, the telescopic spline 5 can produce a buffering effect during butt joint to ensure that the butt joint process will not damage the test piece and the telescopic spline 5; the use of the telescopic spline 5 can compensate the centering deviation of 0.03mm, and can also meet the requirements of the maximum speed of 15000rpm and the maximum torque of 200Nm at low speed.

[0031] The locking device 6 is symmetrically arranged on the outside of the rotating flange 41, and each locking device 6 includes a locking bracket 61 arranged on the front side of the high-speed bearing seat 4, a locking cylinder 62 is arranged on the locking bracket 61, and the front end of the piston shaft rod of the locking cylinder 62 is provided with a locking block 63 for abutting against the outside edge of the rotating flange 41 to perform locking operation.

[0032] The front end of the high-speed dynamometer 1 is further provided with a connecting flange, and a plurality of dynamic balance holes are arranged on the connecting flange, a plurality of dynamic balance holes are arranged on the torque flange 2, and a plurality of dynamic balance holes are arranged on the connecting flanges on the two sides of the shaft coupling 3, and a counterweight can be mounted in each dynamic balance hole, so that the high-speed shaft string can be precisely dynamically balanced through the plurality of dynamic balance holes on the plurality of flanges, and the dynamic balance grade G1 can be easily achieved.

[0033] In addition, the high-speed shaft string is further connected with an electric control system, the electric control system optimizes the parameters of the motor in the test process through the PLC control frequency converter and designs the corresponding control logic, and the speed and torque accuracy of the high-speed motor are realized.

[0034] In use, the following analysis means of shaft string torsional vibration analysis and shaft string natural frequency analysis can be used to ensure that the high-speed shaft string does not produce vibration problems, torsional vibration and even shaft breakage and other failures when applied to the offline test bench, and the service life is ensured: the shaft string torsional vibration analysis uses the torsional vibration frequency calculation formula or the torsional vibration calculation software according to the torsional stiffness and rotational inertia fulcrum parameters of each part of the shaft string structure, and the shaft system torsional vibration frequency can be obtained by analysis; the shaft string natural frequency analysis uses the finite element method to perform modal analysis on the shaft string, and the natural frequency of the shaft string can be obtained.

[0035] The highest speed of the high-speed shaft string provided by the utility model is 15000rpm, and the maximum torque is 200Nm, so it can be applied to the high-speed offline test bench; the natural frequency and the torsional vibration natural frequency of the high-speed shaft string avoid the speed range applied to the high-speed offline test bench, so that the shaft string resonance is avoided; and all the connecting flanges have precise dynamic balance adjustment structures, and the dynamic balance grade G1 can be easily achieved.

[0036] Although the embodiments of the utility model have been shown and described, it is obvious that the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, those skilled in the art can understand that all other embodiments obtained by various changes, modifications, replacements and modifications of these embodiments without departing from the principles and spirits of the utility model, belong to the protection scope of the utility model.

Claims

1. A high-speed shaft string for a high-speed offline test bench of a new energy vehicle, characterized in that: It includes high-speed dynamometer (1), torque flange (2), shaft coupling (3), high-speed bearing seat (4), telescopic spline (5) connected coaxially in turn, the front end of high-speed bearing seat (4) is provided with locking device (6) on the outside of its shaft, the front end shaft of high-speed bearing seat (4) is provided with rotary flange (41), the locking device (6) is provided with two groups on the outside of rotary flange (41), and the two groups of locking device (6) all include locking bracket (61) provided on the front side of high-speed bearing seat (4), locking cylinder (62) is provided on locking bracket (61), and the front end of piston shaft of locking cylinder (62) is provided with locking block (63), the front end of high-speed dynamometer (1) is provided with connecting flange, and a plurality of dynamic balancing holes are provided on the flange, a plurality of dynamic balancing holes are provided on torque flange (2), a plurality of dynamic balancing holes are provided on the connecting flange of both sides of shaft coupling (3), a plurality of balancing holes (42) are uniformly provided on the outer circular side wall of rotary flange (41), and counterweight blocks can be installed in the dynamic balancing holes and balancing holes (42).

2. The high-speed shaft string for a new energy vehicle high-speed test bench according to claim 1, characterized in that: The high-speed dynamometer (1) includes horizontally arranged high-speed detection motor (11), the bottom of the shell of high-speed detection motor (11) is provided with a motor mounting seat (12) near both ends, and the top surface of the shell of high-speed detection motor (11) is provided with an electric control box (13), the electric control box (13) is built-in electric control components and is electrically connected with high-speed detection motor (11), torque flange (2) and high-speed bearing seat (4).

3. The high-speed shaft string for a new energy vehicle high-rotation-speed off-line test bench according to claim 2, characterized in that: The torque flange (2) is arranged on the shaft of high-speed detection motor (11) and rotates coaxially with it, and a torque sensor (21) is arranged below the torque flange (2).

4. The high-speed shaft string for a new energy vehicle high-rotation-speed off-line test bench according to claim 3, characterized in that: The shaft coupling (3) can be selected diaphragm coupling, or bellows coupling, or ball cage universal joint.

5. The high-speed shaft string for a new energy vehicle high-rotation-speed off-line test bench according to claim 4, characterized in that: The high-speed bearing seat (4) is built-in high-precision grade angular contact ball bearing and adopts grease lubrication, and temperature sensor and vibration sensor are installed on the high-speed bearing seat (4).

6. The high-speed shaft string for a new energy vehicle high-rotation-speed off-line test bench according to claim 5, characterized in that: The telescopic spline (5) is installed at the shaft center of torque flange (2) and internally contains a spring.

7. The high-speed shaft string for a new energy vehicle high-rotation-speed off-line test bench according to claim 6, characterized in that: The high-speed shaft is connected with an electric control system, the electric control system optimizes the parameters of motor and designs corresponding control logic in the test process through PLC control frequency converter.

8. The high-speed shaft string for a high-speed test bench of a new energy vehicle according to any one of claims 1-7, characterized in that: The telescopic spline (5) can compensate the deviation of 0.03mm, and can meet the maximum speed of 15000rpm and the maximum torque of 200Nm at low speed.

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