Fixture for EMC test loading of dynamic operation condition of steering system

Abstract

The utility model relates to the technical field of machinery, in particular to a fixture for EMC (Electro Magnetic Compatibility) test loading of a steering system under a dynamic operation condition, which comprises a shell, connecting blocks, a spring, a rack extension rod, a bearing rod, an end cover, a sleeve and an adjusting nut, the two ends of the shell are respectively provided with a connecting block I and an end cover, and the rack extension rod is arranged in the shell; the end of the rack extension rod penetrates through a through hole of the end cover, the second connecting block, the sleeve and the adjusting nut are arranged outside the rack extension rod in a sleeving mode, the second connecting block is located in the shell, the sleeve is located in the through hole of the end cover, the two ends of the bearing rod are located in a mounting hole of the second connecting block and a mounting hole of the shell respectively, and the bearing rod is sleeved with a spring. Compared with the prior art, when a steering system is in dynamic operation, the spring is extruded through the rack extension rod and the sliding plate, so that a dynamic loading working condition is realized; meanwhile, the deformation of the spring is adjusted by adjusting the adjusting nut on the extension rod of the rack, so that different loading forces are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical technical field, concretely is a kind of clamp for steering system dynamic operation condition EMC test loading. BACKGROUND

[0002] In 2021 release, 2022 start implementation of whole car announcement test GB 17675-2021 "Automobile Steering System Basic Requirements" standard, perfects GB 34660-2017 "Road Vehicles Electromagnetic Compatibility Requirements and Test Methods" table 9 vehicle anti-interference test condition and failure criterion specific examination method, GB 17675-2021 "Automobile Steering System Basic Requirements" explicitly requires that when whole car is carried out EMC test, steering wheel needs to keep repeated stable rotation state, and the total range of single cycle rotation angle is greater than 360 °.Thus, from whole car EMC test decomposition to EPS level EMC test needs to realize component level dynamic condition to meet the test requirements.

[0003] Referring to Figure 1 , existing electric power steering system EMC test loading fixture is composed of Y-shaped clamp 1, L-shaped clamp 2, adjusting bolt 3, Y-shaped clamp 1 is fixed on sensor screw hole position, L-shaped clamp 2 is fixed on input shaft rear, and different static loading conditions are realized by adjusting the position of adjusting bolt 3.

[0004] Existing electric power steering system EMC test loading fixture cannot load dynamic running electric power steering system, and cannot realize the dynamic condition requirement of GB 17675-2021 "Automobile Steering System Basic Requirements".

[0005] Therefore, it is needed to design a kind of clamp for steering system dynamic operation condition EMC test loading, which can still be loaded in the dynamic operation of steering system. SUMMARY

[0006] The utility model aims at overcoming the insufficient of prior art, provides a kind of clamp for steering system dynamic operation condition EMC test loading, which can still be loaded in the dynamic operation of steering system.

[0007] In order to achieve the above object, the utility model relates to a kind of clamps for steering system dynamic operating condition EMC test loading, including shell, connecting block, spring, rack extension rod, bearing rod, end cover, sleeve, calibration nut, the both ends of shell are respectively equipped with connecting block one, end cover, the central part of connecting block one, end cover is equipped with through-hole, rack extension rod is installed in shell, the end of rack extension rod passes through the through-hole of end cover, connecting block two, sleeve, calibration nut are set in the outside of rack extension rod, and connecting block two is located in the inside of shell, sleeve is located in the through-hole of end cover, the both ends of sleeve are respectively in contact with calibration nut, connecting block two, the both ends of bearing rod are respectively located in the mounting hole of connecting block two and the mounting hole of shell, spring is sleeved on bearing rod, and the both ends of spring are respectively against connecting block two, shell.

[0008] The spring is 4.

[0009] The rack of steering system is connected with the other end of rack extension rod after passing through the through-hole of connecting block one.

[0010] Connecting block one and shell are connected by screw.

[0011] Spring and connecting block two are equipped with gasket.

[0012] Compared with prior art, when steering system is in dynamic operation, rack extension rod, sliding plate extrude spring, realize dynamic loading condition;At the same time, by adjusting calibration nut on rack extension rod, the deformation size of spring is adjusted, so that different loading force is realized. ACCURACY OF DRAWINGS

[0013] Figure 1 It is the use state diagram of existing electric power steering system EMC test loading clamp.

[0014] Figure 2 It is the structure diagram of the utility model.

[0015] Figure 3 It is the sectional view of the utility model.

[0016] Figure 4 It is the explosion drawing of the utility model.

[0017] Figure 5 It is the schematic diagram of the use state of the utility model.

[0018] Figure 6 It is the sectional view of the use state of the utility model.

[0019] Figure 7 It is the EPS rack stress curve diagram. DETAILED DESCRIPTION

[0020] The present invention will now be further described with reference to the accompanying drawings.

[0021] See Figure 2 , Figure 3 and Figure 4 This utility model is a fixture for EMC testing of a steering system under dynamic operating conditions. It includes a housing, connecting blocks, springs, a rack extension rod, a bearing rod, an end cap, a sleeve, and an adjusting nut. Connecting blocks 1 5 and end caps 9 are respectively installed at both ends of the housing 4. A through hole is provided in the center of the connecting blocks 1 5 and end caps 9. The rack extension rod 7 is installed inside the housing 4, and the end of the rack extension rod 7 passes through the through hole of the end cap 9. Connecting blocks 2 8, sleeves 10, and adjusting nuts 11 are sleeved on the rack extension rod 7, and connecting blocks 2 8 is located inside the housing 4. The sleeves 10 are located in the through hole of the end cap 9, and both ends of the sleeves 10 are in contact with the adjusting nut 11 and connecting blocks 2 8, respectively. The two ends of the bearing rod 12 are located in the mounting holes of connecting blocks 2 8 and the housing 4, respectively. A spring 6 is sleeved on the bearing rod 12, and the two ends of the spring 6 abut against connecting blocks 2 8 and the housing 4, respectively.

[0022] Preferably, there are 4 springs 6.

[0023] For ease of installation and fixation, connecting block 5 is connected to housing 4 by screws 13. A washer 14 is provided between spring 6 and connecting block 8.

[0024] See Figure 5 , Figure 6 In operation, the two clamps are connected to the two ends of the steering system housing. The rack 15 of the steering system passes through the through hole of the connecting block 1 5 and connects to the other end of the rack extension rod 7. Adjusting the position of the adjusting nut 11 adjusts the position of the connecting block 2 8 to ensure that there is no play in the spring 6 inside the housing 4, thus ensuring that the spring 6 is in a zero-deformation state before testing. When the dynamic movement of the rack 15 of the steering system is triggered, the rack 15 drives the rack extension rod 7 to move, and the deformation of the spring 6 is achieved through the change in the position of the connecting block 2 8. This invention simulates different load forces on the rack 15 by using the spring force difference caused by the different deformation strokes of the spring 6 in the left and right clamps. Figure 7 As shown.

[0025] In practical applications, for EPS with different rack forces and rack strokes, dynamic loading tests can be conducted by selecting spring coefficients and springs of different lengths.

[0026] When the steering system is in dynamic operation, this invention achieves dynamic loading by compressing the spring through the rack extension rod and sliding plate; at the same time, by adjusting the adjusting nut on the rack extension rod, the deformation of the spring can be adjusted to achieve different loading forces.

[0027] This invention solves the problem of realizing dynamic operating conditions for EMC testing of automotive steering system components based on GB 17675-2021 "Basic Requirements for Automotive Steering Systems".

Claims

1. A fixture for EMC testing of a steering system under dynamic operating conditions, comprising a housing, a connecting block, a spring, a rack extension rod, a load-bearing rod, an end cap, a sleeve, and an adjusting nut, characterized in that: Connecting block 1 (5) and end cap (9) are respectively installed at both ends of the housing (4). The connecting block 1 (5) and end cap (9) have through holes in the center. The rack extension rod (7) is installed inside the housing (4). The end of the rack extension rod (7) passes through the through hole of the end cap (9). Connecting block 2 (8), sleeve (10) and adjusting nut (11) are sleeved on the outside of the rack extension rod (7). Connecting block 2 (8) is located inside the housing (4). Sleeve (10) is located in the through hole of end cap (9). The two ends of sleeve (10) are in contact with adjusting nut (11) and connecting block 2 (8) respectively. The two ends of the bearing rod (12) are located in the mounting hole of connecting block 2 (8) and the mounting hole of housing (4) respectively. The bearing rod (12) is sleeved with spring (6). The two ends of spring (6) abut against connecting block 2 (8) and housing (4) respectively.

2. The fixture for EMC testing of a steering system under dynamic operating conditions according to claim 1, characterized in that: The spring (6) consists of 4 springs.

3. The fixture for EMC testing of a steering system under dynamic operating conditions according to claim 1, characterized in that: After the rack (15) of the steering system passes through the through hole of the connecting block (5), it is connected to the other end of the rack extension rod (7).

4. The fixture for EMC testing of a steering system under dynamic operating conditions according to claim 1, characterized in that: The connecting block 1 (5) is connected to the housing (4) by screws (13).

5. A fixture for EMC testing of a steering system under dynamic operating conditions according to claim 1, characterized in that: A washer (14) is provided between the spring (6) and the connecting block (8).

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