Locked-rotor device applied to new energy automobile motor test

Abstract

The invention provides a locked-rotor device applied to a new energy automobile motor test. The locked-rotor device comprises a locked-rotor device shell, a locking rotor and a hydraulic driving assembly, the locking rotor is arranged on the locked-rotor device shell, the locked-rotor device shell is used for being fixed on a dynamometer shell, and the locking rotor is used for being connected with a dynamometer output shaft; a locking block is arranged on the periphery of the locking rotor; a hydraulic sliding body is arranged in the locked-rotor device shell, and the hydraulic driving assembly can drive the hydraulic sliding body to move in the locked-rotor device shell, so that the hydraulic sliding body extrudes the locking block; before the locking block is extruded, the locking rotor can rotate on the locked-rotor device shell; when the locking block is extruded, the locking block generates radial deformation, and radial locking force is generated on the locking rotor. Hydraulic pressure is adopted as power to lock the motor shaft, a hydraulic system can provide large pressure, and large locking torque is achieved with the small size.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile motor testing, and in particular to a rotor blocking device applied to new energy automobile motor testing. Background Art

[0002] The stall device in the automotive motor test is a test device used to simulate the stall condition that the motor may encounter in actual operation. The stall condition refers to the state where the motor output shaft is locked and cannot operate normally. This situation may occur when the electric vehicle starts or stops on a certain slope or when the driver operates improperly (such as pulling the handbrake and stepping on the accelerator). The stall characteristic is one of the important indicators for the performance evaluation of the drive motor.

[0003] The traditional locking mechanism adopts the structure of brake disc + pneumatic brake. Because the braking force of pneumatic brake is small, a brake disc with large diameter needs to be installed on the shaft. The large diameter brake disc has large rotational inertia and large unbalanced mass. The hydraulic structure adopted by the present invention has large braking force, so the diameter of the brake disc is reduced. At the same time, by converting the axial force into locking force, the structure is very compact.

[0004] The patent document with publication number CN214953965U discloses a motor stall test fixture, which adopts the following technical scheme: it includes a horizontally arranged mounting plate, at least two supporting legs are fixed to the lower surface of the mounting plate, a cylinder is fixed on the mounting plate, the piston rod of the cylinder passes through the mounting plate and extends outward from the bottom of the mounting plate, the lower end of the piston rod is fixedly connected to an upper connecting plate, an upper die is detachably fixed to the lower surface of the upper connecting plate, an arc-shaped limiting groove is provided on the lower surface of the upper die, a lower die is symmetrically arranged directly below the upper die, the lower die is detachably fixed to the upper surface of the lower connecting plate, and a vertical telescopic mechanism is fixed to the lower surface of the lower connecting plate. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a stalling device for use in motor testing of new energy vehicles.

[0006] A stalling device for use in a new energy vehicle motor test according to the present invention comprises: a stalling device housing, a locking rotor and a hydraulic drive assembly;

[0007] The locking rotor is arranged on the housing of the locking device, the housing of the locking device is used to be fixed on the dynamometer housing, and the locking rotor is used to be connected to the output shaft of the dynamometer; a locking block is arranged on the periphery of the locking rotor;

[0008] A hydraulic sliding body is arranged in the housing of the locking device, and the hydraulic driving assembly can drive the hydraulic sliding body to move in the housing of the locking device so that the hydraulic sliding body squeezes the locking block;

[0009] Before the locking block is squeezed, the locking rotor can rotate on the housing of the locking device; when the locking block is squeezed, the locking block produces radial deformation, thereby generating a radial locking force on the locking rotor.

[0010] Preferably, the moving direction of the hydraulic sliding body is the axial direction of the dynamometer output shaft;

[0011] The hydraulic sliding body is provided with a first extrusion inclined surface inclined relative to the axial direction, and the locking block is provided with a second extrusion inclined surface inclined relative to the axial direction;

[0012] The first extrusion inclined surface and the second extrusion inclined surface are in contact with each other; when the hydraulic sliding body moves axially, the hydraulic sliding body squeezes the locking block through the first extrusion inclined surface and the second extrusion inclined surface.

[0013] Preferably, a return spring is provided on the hydraulic sliding body and the housing of the blocking device;

[0014] When there is no hydraulic driving force, the hydraulic sliding body is reset by the reset spring.

[0015] Preferably, the return spring is provided in plurality;

[0016] The plurality of return springs are evenly spaced and distributed along the circumference of the hydraulic sliding body and the housing of the locking device.

[0017] Preferably, the hydraulic sliding body comprises: a sliding guide portion and an extrusion portion which are integrally arranged;

[0018] The connecting position of the sliding guide part and the extrusion part forms an annular step pushing structure, and the position of the locking device housing corresponding to the annular step pushing structure is provided with an annular hydraulic oil channel;

[0019] The hydraulic driving assembly drives the hydraulic sliding body to move through the annular step pushing structure and the annular hydraulic oil passage.

[0020] Preferably, the housing of the blocking device is provided with a hydraulic oil inlet hole and a pressure relief hole at a position corresponding to the step pushing structure;

[0021] The hydraulic oil inlet hole and the pressure relief hole are in communication with the annular hydraulic oil passage.

[0022] Preferably, a first O-ring is provided between the outer side wall of the extrusion portion and the inner side wall of the housing of the blocking device;

[0023] A second O-ring is provided between the outer wall of the sliding guide portion and the inner wall of the housing of the locking device.

[0024] Preferably, the locking block is a wedge.

[0025] Preferably, the locking device housing is connected and fixed to the dynamometer housing by a first bolt.

[0026] Preferably, the locking rotor is connected and fixed to the dynamometer output shaft via a second bolt.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention adopts hydraulic pressure as the power source for driving the locking structure, and drives the hydraulic sliding body through hydraulic pressure, so that the hydraulic sliding body squeezes the locking block, and then the locking block generates a locking force on the locking rotor, which solves the problem of insufficient locking force and enables the locking device to achieve large torque locking requirements.

[0029] 2. The present invention uses a plurality of springs evenly distributed to reset the hydraulic sliding body, thereby solving the problem that the locking device is difficult to reset and has poor reset reliability.

[0030] 3. The present invention adopts hydraulic drive. Since hydraulic locking can provide a higher locking force, the diameter and thickness of the locking rotor can be made very small, the moment of inertia is reduced, and it can be suitable for high-speed test applications.

[0031] 4. The whole device of the present invention can be installed on the dynamometer housing, making the overall structure more compact and avoiding the need for additional brackets to support the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the stalling device used in the motor test of new energy vehicles;

[0034] Figure 2 This is the front view of the stall device used in the motor test of new energy vehicles;

[0035] Figure 3 for Figure 2 The cross-sectional diagram of the stall device used in the new energy vehicle motor test along the AA line;

[0036] Figure 4 for Figure 2 Schematic diagram of the cross-section along line BB of the stall device used in the new energy vehicle motor test.

[0037] The figure shows:

[0038] 1. Dynamometer housing; 2. Dynamometer output shaft; 3. Locking device housing; 4. Hydraulic sliding body; 401. Sliding guide part; 402. Extrusion part; 5. Locking block; 6. Locking rotor; 7. Reset spring; 8. First O-ring; 9. Second O-ring; 10. Hydraulic oil inlet hole; 11. Pressure relief hole; 12. First bolt; 13. Second bolt. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0040] Embodiment 1:

[0041] like Figure 1-4 As shown, this embodiment provides a stalling device for testing new energy vehicle motors, including: a stalling device housing 3, a locking rotor 6, and a hydraulic drive assembly; the locking rotor 6 is arranged on the stalling device housing 3, the stalling device housing 3 is used to be fixed on the dynamometer housing 1, and the locking rotor 6 is used to connect the dynamometer output shaft 2; a locking block 5 is arranged on the periphery of the locking rotor 6; a hydraulic sliding body 4 is arranged in the stalling device housing 3, and the hydraulic drive assembly can drive the hydraulic sliding body 4 to move in the stalling device housing 3, so that the hydraulic sliding body 4 squeezes the locking block 5; before the locking block 5 is squeezed, the locking rotor 6 can rotate on the stalling device housing 3; when the locking block 5 is squeezed, the locking block 5 produces radial deformation, and a radial locking force is generated on the locking rotor 6. The locking block 5 is squeezed by the inclined surface to cause the radial deformation.

[0042] The locking block 5 is a wedge. The locking device housing 3 is connected and fixed to the dynamometer housing 1 through a first bolt 12. The locking rotor 6 is connected and fixed to the dynamometer output shaft 2 through a second bolt 13.

[0043] The hydraulic sliding body 4 and the locking device housing 3 are provided with a return spring 7; when there is no hydraulic driving force, the hydraulic sliding body 4 is reset by the return spring 7. There are multiple return springs 7; the multiple return springs 7 are evenly spaced along the circumference of the hydraulic sliding body 4 and the locking device housing 3.

[0044] The hydraulic sliding body 4 includes: an integrally arranged sliding guide part 401 and an extrusion part 402; the connection position of the sliding guide part 401 and the extrusion part 402 forms an annular step push structure, and the position of the locking device housing 3 corresponding to the annular step push structure is provided with an annular hydraulic oil channel; the hydraulic drive assembly drives the hydraulic sliding body 4 to move through the annular step push structure and the annular hydraulic oil channel. The moving direction of the hydraulic sliding body 4 is the axial direction of the dynamometer output shaft 2; the hydraulic sliding body 4 is provided with a first extrusion inclined surface inclined relative to the axial direction, and the locking block 5 is provided with a second extrusion inclined surface inclined relative to the axial direction; the first extrusion inclined surface and the second extrusion inclined surface are in contact; when the hydraulic sliding body 4 moves in the axial direction, the hydraulic sliding body 4 squeezes the locking block 5 through the first extrusion inclined surface and the second extrusion inclined surface. The first extrusion inclined surface is provided on the extrusion part 402.

[0045] The position of the locking device housing 3 corresponding to the step pushing structure is provided with a hydraulic oil inlet hole 10 and a pressure relief hole 11; the hydraulic oil inlet hole 10 and the pressure relief hole 11 are connected to the annular hydraulic oil channel. A first O-type sealing ring 8 is provided between the outer wall of the extrusion part 402 and the inner wall of the locking device housing 3; a second O-type sealing ring 9 is provided between the outer wall of the sliding guide part 401 and the inner wall of the locking device housing 3.

[0046] Working principle:

[0047] The locking device housing 3 is fixed to the dynamometer housing 1 with bolts, and the locking rotor 6 is connected to the dynamometer output shaft 2. The hydraulic sliding body 4 moves forward under the action of the hydraulic oil pressure, and pushes the locking block 5 to axially deform through the inclined surface, so that the locking block 5 contacts and squeezes the locking rotor 6 and generates friction, thereby preventing the rotation of the dynamometer shaft and the entire shaft system, playing a role of locking.

[0048] When locking is not required, the hydraulic station releases the pressure in the system, and the return spring 7 pushes the hydraulic sliding body 4 back to its original position. At this time, the locking block 5 returns to its shape before deformation and no longer contacts the locking rotor 6. The dynamometer shaft and the entire shaft system can now rotate freely.

[0049] The first O-ring 8 and the second O-ring 9 are used to seal the high-pressure hydraulic oil, the hydraulic oil inlet hole 10 is used for pressure supply, and the pressure relief hole 11 is used for manual pressure relief.

[0050] This embodiment uses hydraulic pressure as the power to lock the motor shaft. The hydraulic system can provide a large pressure and achieve a large locking torque with a small volume.

[0051] In this embodiment, the hydraulic pressure pushes the sliding body to slide forward and backward, and the linear force is converted into a locking force in the rotational direction through the inclined surface, and the structure is compact.

[0052] After the hydraulic pressure of this embodiment is released, it is reset by 8 springs evenly distributed around the circumference, and the reset is reliable, thereby avoiding the error of the axle being still clamped after unlocking.

[0053] In this embodiment, the hydraulic oil pushes the sliding body to slide, and the pushing area is an annular belt with uniform force.

[0054] The whole device of this embodiment is installed on the dynamometer housing, with compact structure and strong integration.

[0055] The present invention adopts hydraulic pressure as the power to lock the motor shaft. The hydraulic system can provide a large pressure and realize a large locking torque with a small volume.

[0056] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A stalling device for new energy vehicle motor testing, characterized in that: include: A locking device housing (3), a locking rotor (6) and a hydraulic drive assembly; The locking rotor (6) is arranged on the locking device housing (3), the locking device housing (3) is used to be fixed on the dynamometer housing (1), and the locking rotor (6) is used to be connected to the dynamometer output shaft (2); a locking block (5) is arranged on the periphery of the locking rotor (6); A hydraulic sliding body (4) is arranged in the housing (3) of the locking device, and the hydraulic driving component can drive the hydraulic sliding body (4) to move in the housing (3) of the locking device, so that the hydraulic sliding body (4) squeezes the locking block (5); Before the locking block (5) is squeezed, the locking rotor (6) can rotate on the locking device housing (3); when the locking block (5) is squeezed, the locking block (5) undergoes radial deformation, thereby generating a radial locking force on the locking rotor (6).

2. The stalling device for new energy vehicle motor testing according to claim 1 is characterized in that: The moving direction of the hydraulic sliding body (4) is the axial direction of the dynamometer output shaft (2); The hydraulic sliding body (4) is provided with a first extrusion inclined surface inclined relative to the axial direction, and the locking block (5) is provided with a second extrusion inclined surface inclined relative to the axial direction; The first extrusion inclined surface and the second extrusion inclined surface are in contact with each other; when the hydraulic sliding body (4) moves axially, the hydraulic sliding body (4) squeezes the locking block (5) through the first extrusion inclined surface and the second extrusion inclined surface.

3. The stalling device for new energy vehicle motor testing according to claim 1 is characterized in that: The hydraulic sliding body (4) and the locking device housing (3) are provided with a return spring (7); When there is no hydraulic driving force, the hydraulic sliding body (4) is reset by the reset spring (7).

4. The stalling device for new energy vehicle motor testing according to claim 3 is characterized in that: The return spring (7) is provided in plurality; The plurality of return springs (7) are evenly spaced and distributed along the circumference of the hydraulic sliding body (4) and the housing (3) of the locking device.

5. The stalling device for new energy vehicle motor testing according to claim 1 is characterized in that: The hydraulic sliding body (4) comprises: a sliding guide portion (401) and a pressing portion (402) which are integrally arranged; The connection position of the sliding guide part (401) and the extrusion part (402) forms an annular step pushing structure, and the position of the locking device housing (3) corresponding to the annular step pushing structure is provided with an annular hydraulic oil channel; The hydraulic drive assembly drives the hydraulic sliding body (4) to move via the annular step pushing structure and the annular hydraulic oil channel.

6. The stalling device for new energy vehicle motor testing according to claim 5 is characterized in that: The locking device housing (3) is provided with a hydraulic oil inlet hole (10) and a pressure relief hole (11) at a position corresponding to the step pushing structure; The hydraulic oil inlet hole (10) and the pressure relief hole (11) are in communication with the annular hydraulic oil passage.

7. The stalling device for new energy vehicle motor testing according to claim 6 is characterized in that: A first O-type sealing ring (8) is provided between the outer side wall of the extrusion portion (402) and the inner side wall of the housing (3) of the blocking device; A second O-type sealing ring (9) is provided between the outer side wall of the sliding guide portion (401) and the inner side wall of the housing (3) of the locking device.

8. The stalling device for new energy vehicle motor testing according to claim 1 is characterized in that: The locking block (5) is a wedge.

9. The stalling device for new energy vehicle motor testing according to claim 1 is characterized in that: The locking device housing (3) is connected and fixed to the dynamometer housing (1) via a first bolt (12).

10. The stalling device for new energy vehicle motor testing according to claim 1 is characterized in that: The locking rotor (6) is connected and fixed to the dynamometer output shaft (2) via a second bolt (13).

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