Mechanical loading device and test method suitable for EMC test of motor for steering gear

Abstract

The purpose of this invention is to solve the technical problem that existing testing schemes generate interference signals during operation, leading to inaccurate EMC test results for motor controllers. This invention provides a mechanical loading device and testing method suitable for EMC testing of steering gear motors. The device includes a base plate, a first bracket, a base, a bearing housing assembly, a second bracket, brake pads, and a brake caliper. The first bracket is used to fix the steering gear motor controller under test horizontally above the base plate, and the output shaft end of the steering gear motor controller under test is connected to the center of the brake pads through the bearing housing assembly for torque transmission. The outer periphery of the brake pads is installed vertically in the U-shaped groove of the brake caliper, and the brake caliper is fixedly mounted above the base plate via the second bracket. The bearing housing assembly is mounted above the base plate via the base and is located between the first and second brackets.

Description

Technical Field

[0001] This invention relates to a mechanical loading device for testing, specifically to a mechanical loading device and testing method suitable for EMC testing of motors used in steering gears. Background Technology

[0002] With the development of automotive electronics technology, the pure hydraulic power steering systems widely used in heavy-duty commercial vehicle steering systems are gradually being replaced by electro-hydraulic power steering systems. The motor controller, as an important component of the electro-hydraulic power steering system, typically has the structure shown in the attached diagram. Figure 1 As shown, its performance directly affects the handling, stability, and safety of a vehicle. Therefore, in order to ensure that the electro-hydraulic power steering system can operate safely and reliably in its respective electromagnetic environment, the motor controller of the electro-hydraulic power steering system needs to comply with a series of international and domestic EMC standards. The reliability of its test results will directly affect the performance evaluation of the steering system assembly.

[0003] Currently, when conducting EMC tests on the motor controller of an electro-hydraulic power steering system, the test scheme mainly consists of a mounting bracket for the motor under test, a hysteresis brake, a stall fixture, and a support. This scheme can provide the target test conditions, but since the hysteresis brake in this scheme mainly generates and controls torque by controlling the excitation current, it will generate a large amount of interference signal during operation, which will greatly affect the test results of the motor controller EMC test.

[0004] Chinese patent CN111380678A simulates the working conditions of brake pads in actual applications by mounting the brake caliper, brake pads, and brake disc onto a bearing head, thereby measuring the minimum torque required for the brake disc to disengage from the brake pads and generate relative rotation. While this method can accurately generate the torque required for motor controller EMC testing, it does not address the motor controller EMC test itself, thus failing to resolve the issue of interference signals generated during braking in existing testing methods. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem that the test results of motor controller EMC test are inaccurate due to interference signals generated during operation in existing test schemes, and to provide a mechanical loading device and test method suitable for EMC test of motors for steering gears.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] A mechanical loading device suitable for EMC testing of steering gear motors, characterized by including:

[0008] A base plate, with a first bracket, a base, and a second bracket arranged sequentially from one side of the base plate to the other;

[0009] The first bracket is used to fix the motor controller of the steering gear under test, and the motor controller of the steering gear under test is fixed in the horizontal direction. The first bracket is provided with a through hole for the output shaft end of the motor controller of the steering gear under test to pass through.

[0010] A bearing housing assembly is fixedly connected to the base. The input end of the bearing housing assembly is coaxially connected to the output shaft end of the motor controller of the steering gear under test. A brake pad is coaxially connected to the output end for transmitting torque.

[0011] A brake caliper is fixedly connected to the second bracket. The outer periphery of the brake pad is located in the U-shaped groove of the brake caliper. The hydraulic control line connector of the brake caliper is connected to an external hydraulic control device.

[0012] Furthermore, the second bracket includes two columns and a connecting rod. The two columns are symmetrically arranged on both sides of the brake pad and fixedly connected to the base plate. The two ends of the connecting rod are fixedly connected to the two columns respectively, and the brake caliper is fixedly connected to the connecting rod.

[0013] Furthermore, the column is evenly provided with a plurality of connecting holes arranged vertically;

[0014] The connecting rod is L-shaped, comprising a long rod and a short rod. Both the end of the long rod furthest from the short rod and the short rod have elongated connecting grooves. The connecting rod is fixed to the column by connecting bolts passing through the connecting grooves and installed in connecting holes. Near the short rod, the long rod also has an elongated mounting groove corresponding to the bolt mounting holes on the brake caliper. By adjusting the positions of the connecting bolts in the multiple connecting holes, the radial relative position between the brake caliper and the brake pads can be adjusted. By adjusting the positions of the connecting bolts in the elongated connecting grooves and mounting grooves, the consistency of the distance between the bottom surface of the U-shaped groove of the brake caliper and the outer periphery of the brake pads can be adjusted. The elongated connecting grooves are used for coarse adjustment, and the elongated mounting grooves are used for fine adjustment.

[0015] Furthermore, a connecting seat is provided at the bottom of the column, and a strip-shaped hole is provided on the connecting seat. The extension direction of the strip-shaped hole is parallel to the axis of the brake pad. The connecting seat is connected to the base plate by a mounting bolt passing through the strip-shaped hole. By adjusting the position of the mounting bolt in the strip-shaped hole, the relative position between the brake caliper and the brake pad in the axial direction is adjusted to maintain the consistency of the distance between the U-shaped groove sidewall of the brake caliper and the sidewall of the brake pad.

[0016] Furthermore, the bearing housing assembly includes a bearing housing, two bearings, and a rotating shaft. The bottom of the bearing housing is fixedly connected to the base plate. The two bearings are symmetrically fixed inside the bearing housing. The rotating shaft is disposed in the inner rings of the two bearings and passes through both ends of the bearing housing. In order to prevent the rotating shaft from shifting during rotation, a limiting block is provided on the outer side of the middle section of the rotating shaft. The limiting block is located between the inner rings of the two bearings.

[0017] One end of the rotating shaft is the output end of the bearing housing assembly, which is equipped with a flange for connecting the brake pads; the other end of the rotating shaft is the input end of the bearing housing assembly, which is equipped with an adapter for connecting the output shaft end of the motor controller for the steering gear under test.

[0018] The rotating shaft is connected to the flange and adapter with an interference fit; and the side wall at the connection between the rotating shaft and the flange and adapter is provided with a flat key for circumferential fixation.

[0019] Furthermore, in order to transmit torque more accurately, the outer end of the adapter is provided with a swivel pad, and the adapter is connected to the corresponding structure at the output shaft end of the motor controller of the steering gear under test through the swivel pad.

[0020] Furthermore, the base includes a support seat and a connecting plate, the connecting plate being disposed on the top of the support seat and fixedly connected to the bearing seat, and the support seat being fixedly connected to the base plate.

[0021] Furthermore, the first bracket includes a mounting plate and a fixing frame. The mounting plate is fixedly connected to the base plate, and the fixing frame is vertically mounted on the mounting plate. Both sides of the fixing frame are provided with reinforcing plates connected to the mounting plate, and the reinforcing plates are located on the side away from the bearing housing assembly. The fixing frame is provided with the through hole, and the outer periphery of the through hole is provided with fixing holes for fixing the motor controller of the steering gear under test.

[0022] A test method for EMC testing of steering gear motors, characterized in that it uses a mechanical loading device as described above for EMC testing of steering gear motors, specifically including:

[0023] Step 1: Install the steering gear under test on the first bracket using the motor controller, and connect its output shaft end to the adapter of the bearing housing assembly. Fix the brake pads on the flange of the bearing housing assembly.

[0024] Step 2: Select a brake caliper that matches the brake pads and fix it on the connecting rod so that the outer periphery of the brake pads is installed in the U-shaped groove of the brake caliper, thus completing the assembly of the mechanical loading device suitable for EMC testing of steering gear motors.

[0025] Step 3: Place the assembled mechanical loading device suitable for EMC testing of steering gear motors into a semi-anechoic chamber;

[0026] Step 4: Connect the hydraulic control line connector of the brake caliper to the external hydraulic control device, and supply power to the power supply of the motor controller of the steering gear under test. At the same time, connect the motor controller of the steering gear under test to the external computer.

[0027] Step 5: Use an external computer to send instructions to the motor controller of the steering gear under test to control the output shaft to rotate, thereby driving the brake pads to rotate.

[0028] Step 6: Control the brake calipers to clamp the brake pads using an external hydraulic control device to generate the braking torque required for the test;

[0029] Step 7: Observe the braking torque generated by the motor controller of the steering gear under test through an external computer, and determine whether it has abnormal fluctuations, drops, or performance deviations due to the electromagnetic environment of the semi-anechoic chamber. If abnormal fluctuations, drops, or performance deviations occur, and the index of abnormal fluctuations, drops, or performance deviations exceeds the preset value, it is determined that its EMC performance is not up to standard. If no abnormal fluctuations, drops, or performance deviations occur, or the index of abnormal fluctuations, drops, or performance deviations does not exceed the preset value, it is determined that its EMC performance meets the standard, thus completing the EMC test of the motor of the steering gear under test.

[0030] Furthermore, step 2 specifically involves:

[0031] Select a brake caliper compatible with the brake pads and fix it to the connecting rod, so that the outer periphery of the brake pad is installed in the U-shaped groove of the brake caliper. By adjusting the different positions of the connecting bolts in multiple connecting holes, the radial relative position between the brake caliper and the brake pad is adjusted so that the distance between the bottom of the U-shaped groove of the brake caliper and the outer periphery of the brake pad meets the preset requirements. By adjusting the position of the connecting bolts in the elongated connecting groove and mounting groove, the consistency of the distance between the bottom surface of the U-shaped groove of the brake caliper and the outer periphery of the brake pad is adjusted to meet the preset requirements. By adjusting the position of the mounting bolts in the strip hole of the column connector, the axial relative position between the brake caliper and the brake pad is adjusted to maintain the consistency of the distance between the sidewall of the U-shaped groove of the brake caliper and the sidewall of the brake pad to meet the preset requirements, thereby completing the assembly of the mechanical loading device suitable for EMC testing of steering gear motors.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) In the mechanical loading device for EMC testing of steering gear motors, the output shaft end of the steering gear motor controller under test is connected to the brake pads through a bearing housing assembly to transmit torque, and then the brake caliper is used to generate the braking torque required for the test. There is no need for the hysteresis brake in the prior art. Therefore, the present invention will not generate any interference signals when conducting EMC testing of motor controllers, thus ensuring the accuracy of the test results of EMC testing of motor controllers.

[0034] (2) The mechanical loading device for EMC testing of steering gear motors of the present invention uses an "L"-shaped connecting rod to cooperate with two columns in the second bracket, which can adapt to the bolt mounting holes on conventional brake calipers that are deflected at a certain angle. At the same time, the several connecting holes evenly arranged on the columns cooperate with the connecting grooves and mounting grooves on the connecting rods to adjust the brake calipers installed on the connecting rods to any position that is compatible with the brake pads, thereby improving the adaptability of the device of the present invention and making installation more convenient.

[0035] (3) The bearing housing assembly in the mechanical loading device for EMC testing of motor for steering gear of the present invention includes a bearing housing, two bearings and a rotating shaft. By setting a limiting block on the outer side of the middle section of the rotating shaft, the limiting block is movably connected between the inner rings of the two bearings, which can prevent the rotating shaft from shifting or tilting due to rotation, thus affecting the transmission of the matching torque. Furthermore, flat keys are also provided at both ends of the rotating shaft to limit the circumferential rotation of the adapter and flange relative to the rotating shaft, so that they remain in a relatively fixed position and ensure the accuracy of torque transmission.

[0036] (4) The test method of the present invention for EMC testing of motors for steering gears uses an external braking line to brake the brake caliper. The reverse braking torque is increased or decreased by adjusting the fit gap between the brake caliper and the brake pad. No hysteresis brake is required. No interference signal is generated during the test, which ensures the accuracy and reliability of the test results. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of an existing motor controller;

[0038] Figure 2 This is a three-dimensional structural schematic diagram of an embodiment of the mechanical loading device for EMC testing of steering gear motors according to the present invention during use;

[0039] Figure 3 This is a three-dimensional structural diagram of the bearing housing assembly in an embodiment of the present invention;

[0040] Figure 4 This is a cross-sectional view of the bearing housing assembly in an embodiment of the present invention;

[0041] Figure 5This is a schematic diagram of the connecting rod in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the assembly of the brake pads and brake calipers in an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of the first support in an embodiment of the present invention.

[0044] In the diagram: 1- Motor controller for the steering gear under test, 2- First bracket, 21- Mounting plate, 22- Fixing bracket, 23- Through hole, 24- Fixing hole, 3- Bearing housing assembly, 31- Bearing housing, 32- Bearing, 33- Rotating shaft, 34- Limit block, 35- Flat key, 36- Flange, 37- Adapter, 38- Plum blossom gasket, 4- Brake pad, 5- Column, 6- Connecting rod, 7- Brake caliper, 8- Base plate, 9- Base. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] See appendix Figure 1As shown, this embodiment provides a mechanical loading device suitable for EMC testing of steering gear motors, including a base plate, a first bracket, a base 9, and a second bracket arranged sequentially from one side of the base plate 8 to the other. The first bracket is used to fix the steering gear motor controller 1 under test. The base 9 includes a support seat and a connecting plate. The connecting plate is set on the top of the support seat and is fixedly connected to a bearing housing assembly 3. The bearing housing assembly 3 includes a bearing housing 31, two bearings 32, and a rotating shaft 33. The two bearings 32 are symmetrically arranged in the bearing housing 31, and the rotating shaft 31 is arranged in the inner rings of the two bearings 32 and passes through both ends of the bearing housing 31. A limiting block 34 is provided on the outer periphery of the middle section of the rotating shaft 33 to prevent the rotating shaft 33 from shifting during rotation. The limiting block 34 is movably connected between the inner rings of the two bearings 32. And the side walls at both ends of the rotating shaft 33 are embedded with a circumferential fixing mechanism. A key 35 is attached to a rotating shaft 33. One end of the rotating shaft 33 is interference-fitted with a flange 36, and the other end is interference-fitted with an adapter 37. A brake pad 4 is fixedly connected to the flange 36. The adapter 37 is used to connect to the output shaft end of the motor controller 1 for the steering gear under test. In order to transmit torque more accurately, a perforated pad 38 is provided at the connection between the adapter 37 and the output shaft end of the motor controller 1 for the steering gear under test. This pad serves to reduce vibration, insulate, and buffer the vibration caused by shaft errors, and also to avoid vibration caused by shaft errors, thus extending the service life of the rotating shaft 33 and the bearing 32. A brake caliper 7 is fixedly connected to the second bracket, and the outer periphery of the brake pad 4 is located in the U-shaped groove of the brake caliper. In order to ensure that the braking torque generated when the brake caliper contacts the brake pad is maximized, the brake caliper and the brake pad must ensure the largest contact area. The hydraulic control line connector of the brake caliper 7 is connected to an external hydraulic control device.

[0047] The first bracket 2 includes a mounting plate 21 and a fixing bracket 22. The mounting plate 21 is threadedly connected to the base plate 8. The fixing bracket 22 is vertically mounted on the mounting plate 21. Both sides of the fixing bracket are provided with reinforcing plates connected to the mounting plate 21. The reinforcing plates are located on the side away from the bearing housing assembly 3. The fixing bracket 22 is provided with a through hole 23 that is adapted to the output shaft end of the steering motor controller 1 under test. The outer periphery of the through hole 23 is provided with fixing holes 24 for fixing the steering motor controller 1 under test. The steering motor controller 1 under test is fixedly connected to the fixing bracket 22 by bolts passing through the fixing holes 24.

[0048] The second bracket includes two uprights 5 and a connecting rod 6. The two uprights 5 are symmetrically arranged on both sides of the brake pad 4 and are threadedly connected and fixed to the base plate 8. Multiple connecting holes are evenly arranged vertically on the uprights 5. Because the bolt mounting holes on the brake caliper 7 are offset at a certain angle, the connecting rod 6 is an L-shaped rod, including a long rod and a short rod. To accommodate different connecting hole spacings, a long strip-shaped connecting groove is opened at the end of the long rod away from the short rod and on the short rod. The connecting rod is fixed to the uprights by connecting bolts passing through the connecting grooves and installed in the connecting holes. An installation groove is opened on the long rod near the short rod. The connecting rod and uprights are fixedly connected by connecting bolts passing through the connecting grooves and connecting holes. The brake caliper is fixedly installed on the connecting rod by connecting bolts passing through the bolt mounting holes and installation grooves. Adjustment... The connecting bolts are positioned in different locations within multiple connecting holes to adjust the radial relative position between the brake caliper 7 and the brake pad 4. The position of the connecting bolts in the elongated connecting groove and mounting groove is adjusted to ensure consistency in the distance between the bottom surface of the U-shaped groove of the brake caliper 7 and the outer periphery of the brake pad 4. The elongated connecting groove is used for coarse adjustment, and the elongated mounting groove is used for fine adjustment. A connecting seat is provided at the bottom of the column 5, with a strip-shaped hole extending parallel to the axis of the brake pad 4. The connecting seat is connected to the base plate 8 via mounting bolts passing through the strip-shaped hole. By adjusting the position of the mounting bolts within the strip-shaped hole, the axial relative position between the brake caliper 7 and the brake pad 4 is adjusted to maintain consistency in the distance between the sidewall of the U-shaped groove of the brake caliper 7 and the sidewall of the brake pad 4.

[0049] A test method for EMC testing of steering gear motors, employing the aforementioned mechanical loading device, specifically includes:

[0050] First, the motor controller 1 of the steering gear under test is fixedly installed on the first bracket in the horizontal direction with bolts, and the output shaft end of the motor controller 1 of the steering gear under test is connected to the adapter 37 of the bearing housing assembly 3. At the same time, a suitable brake pad 4 is selected and fixed on the flange 36 of the bearing housing assembly 3.

[0051] The second step is to select a brake caliper 7 that is compatible with the brake pad 4 and fix it to the connecting rod 6 with bolts. Adjust the installation angle between the connecting rod 6 and the column 5 so that the outer periphery of the brake pad 4 is installed in the U-shaped groove of the brake caliper 7, thus completing the assembly of the mechanical loading device suitable for EMC testing of steering motors.

[0052] The third step is to place the assembled mechanical loading device, suitable for EMC testing of steering gear motors, into a semi-anechoic chamber.

[0053] Step 4: Connect the hydraulic control line connector of the brake caliper 7 to the external hydraulic control device, and supply power to the motor controller 1 of the steering gear under test. At the same time, connect the motor controller 1 of the steering gear under test to an external computer for communication through the fiber optic isolator.

[0054] Step 5: Use an external computer to send instructions to the motor controller 1 of the steering gear under test, control the output shaft to rotate, and thus drive the brake pads 4 to rotate.

[0055] Step 6: Control the brake caliper 7 to clamp the brake pad 4 through the external hydraulic control device to generate the braking torque required for the test.

[0056] Step 7: Observe the braking torque generated by the motor controller 1 of the steering gear under test through an external computer, and determine whether it has abnormal fluctuations, drops, or performance deviations due to the electromagnetic environment of the semi-anechoic chamber. If abnormal fluctuations, drops, or performance deviations occur, and the index of abnormal fluctuations, drops, or performance deviations exceeds the preset value, it is determined that its EMC performance is substandard. If no abnormal fluctuations, drops, or performance deviations occur, or the index of abnormal fluctuations, drops, or performance deviations does not exceed the preset value, it is determined that its EMC performance meets the standard, thus completing the EMC test of the motor of the steering gear under test.

[0057] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the scope of the technical solution of the present invention should be included within the protection scope of the present invention. Furthermore, it should be noted that the accompanying drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the actual scope of protection claimed by the present invention.

Claims

1. A mechanical loading device suitable for EMC testing of steering gear motors, characterized in that, include: The base plate (8) is provided with a first bracket (2), a base (9) and a second bracket arranged sequentially from one side to the other. The first bracket (2) is used to fix the motor controller (1) of the steering gear under test, and has a through hole (23) for the output shaft end of the motor controller (1) of the steering gear under test to pass through; The base (9) is fixedly connected to a bearing housing assembly (3). The input end of the bearing housing assembly (3) is coaxially connected to the output shaft end of the motor controller (1) of the steering gear under test. The output end is coaxially connected to a brake pad (4). The second bracket includes two columns (5) and a connecting rod (6). The two columns (5) are symmetrically arranged on both sides of the brake pad (4) and fixedly connected to the base plate (8). The two ends of the connecting rod (6) are fixedly connected to the two columns (5) respectively. A brake caliper (7) is fixedly connected to the connecting rod (6). The outer periphery of the brake pad (4) is located in the U-shaped groove of the brake caliper (7). The hydraulic control pipeline connector of the brake caliper (7) is connected to an external hydraulic control device. The column (5) is provided with a plurality of connecting holes arranged vertically on a uniform basis; The connecting rod (6) is L-shaped, including a long rod and a short rod. The end of the long rod away from the short rod and the short rod are both provided with elongated connecting grooves. The connecting rod is fixed to the column by connecting bolts that pass through the connecting grooves and are installed in the connecting holes. The long rod near the short rod is also provided with elongated mounting grooves corresponding to the bolt mounting holes on the brake caliper (7). By adjusting the different positions of the connecting bolts in the multiple connecting holes, the relative radial position between the brake caliper (7) and the brake pad (4) can be adjusted. By adjusting the position of the connecting bolts in the elongated connecting grooves and mounting grooves, the consistency of the distance between the bottom surface of the U-shaped groove of the brake caliper (7) and the outer periphery of the brake pad (4) can be adjusted. The elongated connecting grooves are used for coarse adjustment, and the elongated mounting grooves are used for fine adjustment.

2. The mechanical loading device for EMC testing of steering gear motors according to claim 1, characterized in that: The bottom of the column (5) is provided with a connecting seat, and the connecting seat has a strip hole. The extension direction of the strip hole is parallel to the axis of the brake pad (4). The connecting seat is connected to the base plate (8) by a mounting bolt passing through the strip hole. By adjusting the position of the mounting bolt in the strip hole, the relative position of the brake caliper (7) and the brake pad (4) in the axial direction is adjusted to maintain the consistency of the distance between the U-shaped groove sidewall of the brake caliper (7) and the sidewall of the brake pad (4).

3. The mechanical loading device for EMC testing of steering gear motors according to claim 1, characterized in that: The bearing housing assembly (3) includes a bearing housing (31), two bearings (32) and a rotating shaft (33). The bottom of the bearing housing (31) is fixedly connected to the base plate (8). The two bearings (32) are symmetrically fixed inside the bearing housing (31). The rotating shaft (33) is set in the inner ring of the two bearings (32) and passes through both ends of the bearing housing (31). A limiting block (34) is set on the outer side of the middle section of the rotating shaft (33). The limiting block (34) is located between the inner rings of the two bearings (32). One end of the rotating shaft (33) is the output end of the bearing housing assembly (3), and a flange (36) is installed thereon for connecting the brake pad (4); the other end of the rotating shaft (33) is the input end of the bearing housing assembly (3), and an adapter (37) is installed thereon for connecting the output shaft end of the motor controller (1) of the steering gear under test. The rotating shaft (33) is connected to the flange (36) and the adapter (37) by interference fit; and the side wall of the connection between the rotating shaft (33) and the flange (36) and the adapter (37) is provided with a flat key (35) for circumferential fixation.

4. The mechanical loading device for EMC testing of steering gear motors according to claim 3, characterized in that: The outer end of the adapter (37) is provided with a plum blossom pad (38), and the adapter (37) is connected to the corresponding structure at the output shaft end of the motor controller (1) of the steering gear under test through the plum blossom pad (38).

5. The mechanical loading device for EMC testing of steering gear motors according to claim 3, characterized in that: The base (9) includes a support seat and a connecting plate. The connecting plate is disposed on the top of the support seat and is fixedly connected to the bearing seat (31). The support seat is fixedly connected to the bottom plate (8).

6. The mechanical loading device for EMC testing of steering gear motors according to claim 1, characterized in that: The first bracket (2) includes a mounting plate (21) and a fixing frame (22). The mounting plate (21) is fixedly connected to the base plate (8). The fixing frame (22) is vertically arranged on the mounting plate (21). Both sides of the fixing frame are provided with reinforcing plates connected to the mounting plate (21), and the reinforcing plates are located on the side away from the bearing housing assembly (3). The fixing frame (22) is provided with the through hole (23). The outer periphery of the through hole (23) is provided with fixing holes (24) for fixing the motor controller (1) of the steering gear under test.

7. A test method suitable for EMC testing of motors used in steering gears, characterized in that, The mechanical loading device used for EMC testing of steering gear motors according to any one of claims 1-6 specifically includes: Step 1: Install the motor controller (1) of the steering gear under test on the first bracket (2) and connect its output shaft end to the adapter (37) of the bearing housing assembly (3). Fix the brake pad (4) on the flange (36) of the bearing housing assembly (3). Step 2: Select a brake caliper (7) that is compatible with the brake pad (4) and fix it on the connecting rod (6) so that the outer periphery of the brake pad is installed in the U-shaped groove of the brake caliper (7) to complete the assembly of the mechanical loading device suitable for EMC testing of steering motor; Step 3: Place the assembled mechanical loading device suitable for EMC testing of steering gear motors into a semi-anechoic chamber; Step 4: Connect the hydraulic control line connector of the brake caliper (7) to the external hydraulic control device, and supply power to the power supply of the steering gear motor controller (1) under test. At the same time, connect the steering gear motor controller (1) under test to the external computer. Step 5: Use an external computer to send instructions to the motor controller (1) of the steering gear under test to control the output shaft to rotate, thereby driving the brake pads (4) to rotate; Step 6: Control the brake caliper (7) to clamp the brake pad (4) through the external hydraulic control device to generate the braking torque required for the test; Step 7: Observe the braking torque generated by the motor controller (1) of the steering gear under test through an external computer, and determine whether it has abnormal fluctuations, drops or performance deviations due to the electromagnetic environment of the semi-anechoic chamber. If abnormal fluctuations, drops or performance deviations occur, and the index of abnormal fluctuations, drops or performance deviations exceeds the preset value, it is determined that its EMC performance is not up to standard. If there are no abnormal fluctuations, drops or performance deviations, or the index of abnormal fluctuations, drops or performance deviations does not exceed the preset value, it is determined that its EMC performance meets the standard, thereby completing the EMC test of the motor of the steering gear under test.

8. The test method for EMC testing of steering gear motors according to claim 7, characterized in that, Step 2 is as follows: Select a brake caliper (7) that is compatible with the brake pad (4) and fix it on the connecting rod (6) so that the outer periphery of the brake pad is installed in the U-shaped groove of the brake caliper (7). By adjusting the different positions of the connecting bolts in multiple connecting holes, the relative position of the brake caliper (7) and the brake pad (4) in the radial direction is adjusted so that the distance between the bottom of the U-shaped groove of the brake caliper (7) and the outer periphery of the brake pad (4) meets the preset requirements. By adjusting the position of the connecting bolts in the long strip connecting groove and the mounting groove, the consistency of the distance between the bottom surface of the U-shaped groove of the brake caliper (7) and the outer periphery of the brake pad (4) meets the preset requirements. By adjusting the position of the mounting bolts in the strip hole of the column (5) connecting seat, the relative position of the brake caliper (7) and the brake pad (4) in the axial direction is adjusted so that the consistency of the distance between the side wall of the U-shaped groove of the brake caliper (7) and the side wall of the brake pad (4) meets the preset requirements. Thus, the assembly of the mechanical loading device suitable for EMC testing of the steering gear motor is completed.

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