Test bench for durability test of EMB ball screw

Abstract

The invention belongs to the technical field of durability test of ball screws, and relates to a test bench for durability test of EMB ball screws, which comprises a test bench, at least one test position arranged on the test bench and an operation bench, and an EMB ball screw is placed on the test position; one end of the test position is provided with a thrust load end, and the other end is provided with a torque test input end. The torque test input end comprises a torque test servo motor, a dynamic torque sensor, a bearing seat assembly and a quick-change driving rotating mechanism; an output shaft of the torque test servo motor is provided with a dynamic torque sensor so as to dynamically detect the rotating speed of the torque test servo motor; the method has the effects of long-time stable test and improvement of the test precision.

Description

Technical Field

[0001] This invention relates to the technical field of ball screw durability testing, and more particularly to a test bench for EMB ball screw durability testing. Background Technology

[0002] Electro-Mechanical Brake (EMB) is a system where the ball screw is no longer a traditional "transmission component" but rather a core, safety-critical "actuator." EMB completely eliminates the hydraulic system, achieving full electronic control. This results in faster response, a more compact structure, and easier integration with vehicle intelligent systems such as ABS, ESC, and autonomous driving. EMB represents the ultimate form of brake-by-wire and is the future direction of automotive braking systems.

[0003] In EMB, the ball screw is the core hub for power conversion. Its function is to accurately, efficiently, and quickly convert the rotational torque of the servo motor into the required clamping force. Its core is to transform a mature industrial precision component into a core actuator that can meet automotive-grade reliability, safety, durability, and environmental requirements through comprehensive innovation in materials, processes, design, and verification.

[0004] However, in the field of ball screws, because ball screws need to be used for a long time, the testing cycle for ball screws is long. Long-term testing can easily lead to inaccurate data acquisition and errors. At the same time, long-term testing can also cause wear and tear on the testing equipment, resulting in insufficient control and thus inaccurate testing. Summary of the Invention

[0005] The purpose of this invention is to provide a test bench for endurance testing of EMB ball screws, in order to solve the technical problems of long test cycles for ball screws, which can easily lead to inaccurate data acquisition and errors during long-term testing. At the same time, long-term testing can also cause wear and tear on the test equipment, resulting in insufficient control and thus inaccurate testing. The invention aims to achieve stable testing over a long period of time and improve test accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A test bench for endurance testing of EMB ball screws, comprising: A test bench, at least one test position on the test bench, and an operating table, wherein an EMB ball screw is placed on the test position and the operating table controls the test bench. One end of the test position is provided with a thrust load end, and the other end is provided with a torque test input end; The torque test input includes a torque test servo motor, a dynamic torque sensor, a bearing housing assembly, and a quick-change drive rotation mechanism; A dynamic torque sensor is installed on the output shaft of the torque testing servo motor to dynamically detect the rotational speed of the torque testing servo motor. The output shaft of the dynamic torque sensor is provided with a bearing housing assembly at its far end. The end of the bearing housing assembly away from the torque test servo motor is provided with a quick-change drive rotation mechanism. The quick-change drive rotation mechanism is aligned with a quick-change positioning mechanism. An EMB ball screw is provided on the quick-change positioning mechanism for testing. The thrust load end is used to drive the EMB ball screw.

[0007] As a preferred embodiment of the present invention, the quick-change drive rotation mechanism includes a connector and a connecting sleeve, wherein the connector and the connecting sleeve are embedded and connected.

[0008] As a preferred embodiment of the present invention, the quick-change positioning mechanism includes a positioning ring and a positioning sleeve, wherein the positioning sleeve is circumferentially positioned around the positioning ring, and the positioning sleeve is aligned and connected to the connector.

[0009] As a preferred embodiment of the present invention, the thrust load end includes a thrust load servo motor, an electric cylinder, and a quick-change tungsten steel block; The thrust load servo motor is connected to the electric cylinder, the pushing end of the electric cylinder is connected to the quick-change tungsten steel block, and the quick-change tungsten steel block is connected to the EMB ball screw.

[0010] As a preferred embodiment of the present invention, a pressure sensor is provided on the quick-change tungsten steel block; The EMB ball screw is equipped with a high and low temperature resistant displacement gauge.

[0011] As a preferred embodiment of the present invention, the test position is provided with a first vertical fixing plate, a second vertical fixing plate and a fixing connecting rod; The first vertical fixing plate is disposed at the end of the electric cylinder facing the test platform, and the second vertical fixing plate is disposed at the end of the torque testing servo motor facing the test platform. The fixing rod connects the first vertical fixing plate and the second vertical fixing plate.

[0012] As a preferred embodiment of the present invention, the test position is covered with an environmental chamber to simulate high temperature and low temperature environments.

[0013] As a preferred embodiment of the present invention, at least one cooling fan is provided on the test bench.

[0014] As a preferred embodiment of the present invention, a protective box is provided at the dynamic torque sensor.

[0015] As a preferred embodiment of the present invention, the dynamic torque sensor is connected to a stabilizing connecting rod, and the stabilizing connecting rod is connected to the protective box.

[0016] The beneficial effects of this invention are: 1. The torque test servo motor is rotated through the torque test input terminal to simulate a constant load. The lead screw reciprocates under the constant load to perform fatigue testing on the lead screw.

[0017] 2. The dynamic torque sensor can detect the magnitude of the torque in real time, thereby adjusting it to a constant torque.

[0018] 3. The test lead screw can be quickly replaced via the quick-change drive rotation mechanism.

[0019] 4. The quick-change positioning mechanism can position the lead screw, improving the accuracy of the lead screw's placement.

[0020] 5. The thrust load end can continuously push the lead screw, and the thrust of the electric cylinder can be detected by the pressure sensor to control the thrust of the electric cylinder. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the test bench for EMB ball screw durability testing according to the present invention. Figure 2 This is a schematic diagram of the test position of the test bench for EMB ball screw durability testing according to the present invention. Figure 3 This is a schematic diagram of the thrust load end and torque test input end of the present invention; Figure 4 This is a schematic diagram of the protective box of the present invention.

[0022] Legend: 1. Test bench; 11. Cooling fan; 2. Test position; 21. First vertical fixing plate; 22. Second vertical fixing plate; 23. Fixing link; 3. Control panel; 4. Thrust load end; 41. Thrust load servo motor; 42. Electric cylinder; 43. Quick-change tungsten carbide block; 44. Pressure sensor; 45. High and low temperature resistant displacement gauge; 5. Torque test input terminal; 51. Torque test servo motor; 52. Dynamic torque sensor; 53. Bearing housing assembly; 54. Quick-change drive rotation mechanism; 541. Connector; 542. Connecting sleeve; 6. Quick-change positioning mechanism; 61. Positioning ring; 62. Positioning sleeve; 7. Environmental enclosure; 8. Protective box; 81. Stabilizing connecting rod. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example: like Figures 1 to 4 As shown, a test bench for endurance testing of EMB ball screws includes: a test bench 1, at least one test position 2 disposed on the test bench 1, and an operating table 3. An EMB ball screw is placed on the test position 2. In this embodiment, to improve accuracy and comparability testing, two test positions 2 are provided to test two EMB ball screws simultaneously. The operating table 3 controls the test bench 1.

[0025] like Figures 1 to 4 As shown, one end of test position 2 is equipped with a thrust load end 4, which is used to push the EMB ball screw. The other end is equipped with a torque test input end 5. The thrust load end 4 provides a thrust to the EMB ball screw under test to make it slide on the track, and the test is carried out by pushing and pulling back and forth. The torque test input end 5 provides torque force to the EMB ball screw to simulate the load on the EMB ball screw, simulating the use of the EMB ball screw with heavy objects in a real environment.

[0026] The torque test input terminal 5 includes a torque test servo motor 51, a dynamic torque sensor 52, a bearing housing assembly 53, and a quick-change drive rotation mechanism 54. The torque force provided by the torque test servo motor 51 is applied to the EMB ball screw, thereby simulating real-world load testing of the EMB ball screw.

[0027] Among them, a dynamic torque sensor 52 is installed on the output shaft of the torque test servo motor 51 to dynamically detect the speed of the torque test servo motor 51, thereby improving the stability of torque application.

[0028] Among them, a bearing housing assembly 53 is set at the far end of the output shaft of the dynamic torque sensor 52. A quick-change drive rotation mechanism 54 is set at the end of the bearing housing assembly 53 away from the torque test servo motor 51. A quick-change positioning mechanism 6 is connected to the quick-change drive rotation mechanism 54 for alignment. An EMB ball screw is set on the quick-change positioning mechanism 6 for testing.

[0029] like Figures 1 to 4As shown, the quick-change drive rotation mechanism 54 includes a connector 541 and a connecting sleeve 542, which are embedded and connected. The connecting sleeve 542 is mounted on the bearing housing assembly 53. The EMB ball screw is connected via the connector 541, and the embedded connector 541 and connecting sleeve 542 facilitate installation and disassembly, improving ease of use.

[0030] The quick-change positioning mechanism 6 includes a positioning ring 61 and a positioning sleeve 62. The positioning sleeve 62 circumferentially surrounds the positioning ring 61 and is aligned with and connected to the connector 541. By embedding the positioning sleeve 62 into the connector 541, the positioning accuracy between the tested EMB ball screw and the torque testing servo motor 51 is achieved. The torque testing servo motor 51 can better apply torque to the tested EMB ball screw, thereby enabling better docking and torque application.

[0031] like Figures 1 to 3 As shown, the thrust load end 4 includes a thrust load servo motor 41, an electric cylinder 42, and a quick-change tungsten steel block 43. The thrust load servo motor 41 is connected to the electric cylinder 42, the pushing end of the electric cylinder 42 is connected to the quick-change tungsten steel block 43, and the quick-change tungsten steel block 43 is connected to the EMB ball screw. The thrust load servo motor 41 drives the electric cylinder 42, which in turn pushes the EMB ball screw back and forth for testing.

[0032] In this embodiment, a pressure sensor 44 is provided on the quick-change tungsten steel block 43 to measure and control the pushing force of the electric cylinder 42 on the EMB ball screw.

[0033] The EMB ball screw is equipped with a high and low temperature resistant displacement gauge 45, which allows the expansion or contraction of the metal to be observed under high or low temperature conditions, thus enabling overall adjustment.

[0034] In this embodiment, the test position 2 is provided with a first vertical fixing plate 21, a second vertical fixing plate 22, and a fixing rod 23. The first vertical fixing plate 21 is located at the end of the electric cylinder 42 facing the test platform 1, and the second vertical fixing plate 22 is located at the end of the torque test servo motor 51 facing the test platform 1. The fixing rod 23 connects the first vertical fixing plate 21 and the second vertical fixing plate 22. The connection between the first vertical fixing plate 21 and the second vertical fixing plate 22 through the fixing rod 23 improves the overall stability and keeps the overall test equipment at the same height and horizontal line, so that the torque side and the thrust are in the same concentric position.

[0035] Test position 2 is equipped with an environmental chamber 7 to simulate high and low temperature environments. The environmental chamber 7 can be set with high and low temperatures to simulate the harsh working environment of the EMB ball screw, and to simulate and verify the performance and durability of the ball screw under extreme environments that it may encounter throughout the vehicle's life cycle, thereby exposing potential faults in advance and ensuring absolute safety.

[0036] In this embodiment, at least one cooling fan 11 is provided on the test bench 1 to dissipate heat inside the test bench 1 and keep the temperature inside the test bench 1 within the normal range.

[0037] In this embodiment, a protective housing 8 is provided at the dynamic torque sensor 52, which can protect the dynamic torque sensor 52 and improve its safety. Simultaneously, a stabilizing connecting rod 81 is connected to the dynamic torque sensor 52 and is connected to the protective housing 8, thereby increasing the stability of the dynamic torque sensor 52.

[0038] In summary: The torque test servo motor 51 at the torque test input end 5 rotates to simulate a constant load, causing the lead screw to reciprocate under this constant load, thus performing fatigue testing on the lead screw. The dynamic torque sensor 52 can detect the torque magnitude in real time, allowing for adjustment to a constant torque. The quick-change drive rotation mechanism 54 enables rapid replacement of the test lead screw. The quick-change positioning mechanism 6 positions the lead screw, improving the accuracy of its placement. The thrust load end 4 continuously pushes the lead screw, and the pressure sensor 44 detects and controls the thrust of the electric cylinder 42.

[0039] All the devices selected in this application are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0040] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A test bench for endurance testing of EMB ball screws, characterized in that, include: Test bench (1), at least one test position (2) provided on the test bench (1) and operation table (3), wherein an EMB ball screw is placed on the test position (2) and the operation table (3) controls the test bench (1); One end of the test position (2) is provided with a thrust load end (4), and the other end is provided with a torque test input end (5); The torque test input terminal (5) includes a torque test servo motor (51), a dynamic torque sensor (52), a bearing housing assembly (53), and a quick-change drive rotation mechanism (54); A dynamic torque sensor (52) is installed on the output shaft of the torque testing servo motor (51) to dynamically detect the rotational speed of the torque testing servo motor (51); The output shaft of the dynamic torque sensor (52) is provided with a bearing housing assembly (53) at the far end. The bearing housing assembly (53) is provided with a quick-change drive rotation mechanism (54) at the end away from the torque test servo motor (51). The quick-change drive rotation mechanism (54) is aligned with a quick-change positioning mechanism (6). An EMB ball screw is provided on the quick-change positioning mechanism (6) for testing. The thrust load end (4) is used to drive the EMB ball screw.

2. The test bench for EMB ball screw durability testing as described in claim 1, characterized in that, The quick-change drive rotation mechanism (54) includes a connector (541) and a connecting sleeve (542), which are embedded and connected.

3. The test bench for EMB ball screw durability testing as described in claim 2, characterized in that, The quick-change positioning mechanism (6) includes a positioning ring (61) and a positioning sleeve (62). The positioning sleeve (62) is circumferentially positioned around the positioning ring (61). The positioning sleeve (62) is aligned and connected to the connector (541).

4. The test bench for EMB ball screw durability testing as described in claim 3, characterized in that, The thrust load end (4) includes a thrust load servo motor (41), an electric cylinder (42), and a quick-change tungsten steel block (43); The thrust load servo motor (41) is connected to the electric cylinder (42), the push end of the electric cylinder (42) is connected to the quick-change tungsten steel block (43), and the quick-change tungsten steel block (43) is connected to the EMB ball screw.

5. The test bench for EMB ball screw durability testing as described in claim 4, characterized in that, A pressure sensor (44) is installed on the quick-change tungsten steel block (43); The EMB ball screw is equipped with a high and low temperature resistant displacement gauge (45).

6. The test bench for EMB ball screw durability testing as described in claim 5, characterized in that, The test position (2) is provided with a first vertical fixing plate (21), a second vertical fixing plate (22) and a fixing rod (23); The first vertical fixing plate (21) is located at one end of the electric cylinder (42) facing the test platform (1), and the second vertical fixing plate (22) is located at one end of the torque test servo motor (51) facing the test platform (1). The fixing rod (23) connects the first vertical fixing plate (21) and the second vertical fixing plate (22).

7. The test bench for EMB ball screw durability testing as described in claim 6, characterized in that, The test position (2) is covered with an environmental chamber (7) to simulate high and low temperature environments.

8. The test bench for EMB ball screw durability testing as described in claim 7, characterized in that, At least one cooling fan (11) is provided on the test bench (1).

9. The test bench for EMB ball screw durability testing as described in claim 8, characterized in that, A protective enclosure (8) is provided at the location of the dynamic torque sensor (52).

10. A test bench for EMB ball screw durability testing as described in claim 9, characterized in that, The dynamic torque sensor (52) is connected to a stabilizing connecting rod (81), which is connected to the protective box (8).

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