A high-precision bearing axial load testing device based on annular wedge disk

Abstract

This invention discloses a high-precision bearing axial load testing device based on an annular wedge plate, belonging to the field of bearing load testing technology. It includes a support frame with a lifting cylinder fixed inside; a base fixed to the upper surface of the support frame, with the output end of the lifting cylinder passing through the base; a top plate fixed above the base by multiple columns; a lifting platform slidably mounted on the columns, with its bottom connected to the output end of the lifting cylinder; a clamping assembly fixed to the upper surface of the lifting platform; and a loading assembly fixed to the lower surface of the top plate, corresponding to the position of the clamping assembly. This invention applies differentiated axial forces to the bearing end face using an annular wedge and a micro-pump, enabling testing under off-center load conditions. Furthermore, it replaces hydraulic pressure with a motor drive, eliminating hysteresis and creep, achieving high linearity and high-frequency response control. The lifting platform, combined with a limiting structure, ensures rigidity and extends bearing life.

Description

Technical Field

[0001] This invention relates to the field of bearing load testing technology, specifically a high-precision bearing axial load testing device based on an annular wedge disk. Background Technology

[0002] In actual service, the main bearings of aero-engines not only bear uniformly distributed axial preload, but also bear significant non-uniform axial loads and off-center torques caused by gyroscopic torque and rotor inertial force when the aircraft performs maneuvers such as pitching, yaw, and rolling. To accurately reproduce these working conditions in ground tests, the loading device must have the ability to generate differentiated axial forces on the circumference of the end face of the bearing being tested.

[0003] Currently, bearing axial loading devices aim to generate uniform axial force. The hydraulic loading system applies force to the entire end face of the bearing through a single piston. However, the axial force on the bearing is uneven during use. Therefore, existing equipment cannot accurately test the axial load of the bearing. Furthermore, due to the nonlinear hysteresis interference of the hydraulic system, it is difficult to achieve precise control of the axial load with high linearity and high response speed.

[0004] To address the above problems, this invention provides a high-precision bearing axial load testing device based on an annular wedge disk, thereby solving the aforementioned issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-precision bearing axial load testing device based on an annular wedge disk, comprising: The bracket has a lifting cylinder fixed inside it; The base is fixed to the upper surface of the bracket, and the output end of the lifting cylinder passes through the base; The top plate is fixed above the base by multiple columns; The lifting platform is slidably mounted on multiple columns, and its bottom is connected to the output end of the lifting cylinder. A clamping assembly is fixed to the upper surface of the lifting platform; The loading component is fixed to the lower end face of the top plate and corresponds to the position of the clamping component.

[0006] Furthermore, preferably, the upper end face of the lifting platform is symmetrically fixed with two limiting posts, and each of the two limiting posts has a limiting groove on the side that is close to each other. Two limiting cylinders are symmetrically fixed on the top plate, and a clearance groove is provided on the top plate. The clearance groove is slidably connected to the limiting posts, and when the clamping component contacts the loading component, the output end of the limiting cylinder is embedded in the limiting groove to complete the limiting.

[0007] Further, preferably, the clamping assembly includes: The test plate is fixed on the lifting platform, and a test motor is fixed inside it; An expansion shaft is rotatably positioned at the center of the test disk and is fixedly connected to the output end of the test motor. A test slot is formed on the upper surface of the test disk; Clamping blocks, configured in multiple units, are evenly distributed around the sidewalls of the test slot and are driven by pneumatic or hydraulic pressure.

[0008] Furthermore, preferably, the height of the upper end face of the expansion shaft is lower than the height of the upper end face of the test disk.

[0009] Further, preferably, the loading component includes: A retaining ring is fixed to the lower end face of the top plate; A thrust assembly is disposed on the lower end face of the fixed ring; A loading motor is fixed on the top plate, and an adjustment component is fixed at its output end. The adjustment component is in contact with the thrust component for transmission.

[0010] Further, preferably, the thrust assembly includes: The thrust ring has its upper end face hinged to the fixed ring by multiple hinge rods; Multiple fixed wedges are configured and evenly fixed around the circumference of the thrust ring; The hinge rod includes a first hinge rod, one end of which is hinged to the thrust ring, and the other end is fixed to a sliding post. A second hinge rod is slidably mounted on the sliding post, and the second hinge rod is hinged to the fixed ring. A tension spring is provided between the sliding post and the second hinge rod, and the initial state of the tension spring is a contracted state.

[0011] Further, preferably, the adjustment component includes: The adjustment disc is fixed at the output end of the loading motor; Multiple sliding blocks are configured and evenly arranged circumferentially within the adjusting disc; The piston is sealed and slidably disposed within the adjusting disc and symmetrically fixed on both sides of the sliding block; An adjusting wedge is fixed on the sliding block and located on the lower end face of the adjusting disc.

[0012] Furthermore, preferably, the upper surface of the adjusting disc is fixed with a plurality of connecting components, and the plurality of connecting components correspond one-to-one with a plurality of sliding blocks. Each connecting component includes two connecting parts, and the two connecting parts correspond to the chambers of the two pistons respectively. The two connecting parts are connected by a pipe, and a micro pump is provided in the middle of the pipe. Both the pipe and the chamber of the piston are filled with hydraulic oil.

[0013] Furthermore, preferably, the plurality of adjusting wedges correspond one-to-one with the plurality of fixed wedges.

[0014] Compared with the prior art, the present invention provides a high-precision bearing axial load testing device based on an annular wedge disk, which has the following advantages: First, by using multiple adjusting wedges arranged in a ring and cooperating with fixed wedges, along with an independent micro pump, differentiated axial forces can be applied to different positions on the circumference of the bearing end face under test. This allows for high-precision reproduction of the gyroscopic torque and off-center load conditions generated during aircraft maneuvers, making the test data closer to the actual service environment. Second, it significantly improves control performance by abandoning the direct loading method of hydraulic cylinders and using a loading motor to drive the adjusting wedges to rotate. This applies thrust to the thrust ring through the fixed wedges, effectively eliminating the nonlinear hysteresis and creep problems of traditional hydraulic systems. This achieves high linearity and high-frequency response precision control of axial loads. Finally, the lifting platform, in conjunction with the limit cylinder and limit groove, ensures that it is in a rigid state during loading, avoiding excessive pressure on the lifting cylinder and improving its service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the clamping component structure of the present invention; Figure 3 This is a schematic diagram of the loading component structure of the present invention; Figure 4 This is a schematic diagram of the thrust assembly structure of the present invention; Figure 5 This is a cross-sectional view of the adjustment component of the present invention; In the diagram: 1. Bracket; 2. Base; 3. Lifting cylinder; 4. Top plate; 5. Column; 6. Lifting platform; 7. Clamping assembly; 8. Loading assembly; 61. Limiting post; 62. Limiting groove; 63. Limiting cylinder; 71. Test plate; 72. Expansion shaft; 73. Test groove; 74. Clamping block; 81. Fixing ring; 82. Thrust assembly; 83. Loading motor; 84. Adjusting assembly; 821. Thrust ring; 822. Fixing wedge; 823. First hinge rod; 824. Second hinge rod; 825. Sliding post; 841. Adjusting plate; 842. Sliding block; 843. Piston; 844. Connecting part; 845. Micro pump; 846. Adjusting wedge. Detailed Implementation

[0016] Reference Figures 1-5 This invention provides a technical solution: a high-precision bearing axial load testing device based on an annular wedge disk, comprising: Support 1, with a lifting cylinder 3 fixed inside it; The base 2 is fixed to the upper end face of the bracket 1, and the output end of the lifting cylinder 3 passes through the base 2; The top plate 4 is fixed above the base 2 by multiple columns 5; The lifting platform 6 is slidably mounted on the plurality of columns 5, and its bottom is connected to the output end of the lifting cylinder 3; The clamping assembly 7 is fixed to the upper end face of the lifting platform 6; The loading component 8 is fixed to the lower end face of the top plate 4 and corresponds to the position of the clamping component 7.

[0017] Preferably, the upper end face of the lifting platform 6 is symmetrically fixed with two limiting posts 61, and each of the two limiting posts 61 has a limiting groove 62 on the side that is close to each other. The top plate 4 is symmetrically fixed with two limiting cylinders 63, and the top plate 4 has a clearance groove. The clearance groove is slidably connected to the limiting post 61. When the clamping component 7 contacts the loading component 8, the output end of the limiting cylinder 63 is embedded in the limiting groove 62 to complete the limiting.

[0018] In other words, after the lifting platform 6 has finished lifting, it is rigidly limited by the limiting cylinder 63 and the limiting groove 62, thereby avoiding damage to the lifting cylinder 3 when axial force is applied, and preventing the lifting platform 6 from falling or shaking due to reaction force during the loading process.

[0019] In this embodiment, the clamping assembly 7 includes: The test plate 71 is fixed on the lifting platform 6, and a test motor is fixed inside it; The expansion shaft 72 is rotatably positioned at the center of the test disk 71 and is fixedly connected to the output end of the test motor. Test slot 73 is formed on the upper surface of the test disk 71; Clamping blocks 74 are configured in multiples, evenly arranged around the sidewall of the test groove 73, and are driven by pneumatic or hydraulic pressure.

[0020] The bearing under test can be quickly centered and reliably fixed by the clamping block 74 and the expansion shaft 72. The expansion shaft 72 tightens the inner ring of the bearing, and multiple clamping blocks 74 press the outer ring of the bearing from the outside. Furthermore, the test motor drives the expansion shaft 72 to rotate, which can also test whether the bearing can rotate normally when subjected to axial load.

[0021] In addition, the height of the upper end face of the expansion shaft 72 is lower than the height of the upper end face of the test plate 71, ensuring that after the bearing is installed, its end face is higher than the upper end face of the expansion shaft 72, so that the loading component 8 can directly contact the bearing end face without interfering with the expansion shaft 72, avoiding the loading force being mistakenly applied to the expansion shaft 72, ensuring that all axial loads are accurately transmitted to the bearing end face, and improving the authenticity of the test results.

[0022] In this embodiment, the loading component 8 includes: A retaining ring 81 is fixed to the lower end face of the top plate 4; The thrust assembly 82 is disposed on the lower end face of the fixed ring 81; The loading motor 83 is fixed on the top plate 4, and an adjustment component 84 is fixed at its output end. The adjustment component 84 is in contact with the thrust component 82 for transmission.

[0023] Among them, the loading motor 83 drives the adjustment component 84, and the adjustment component 84 controls the thrust component 82 to output axial force through contact transmission. The whole system does not rely on traditional hydraulic cylinders, eliminating the nonlinear hysteresis and response delay problems of hydraulic systems, and realizing high linearity, high dynamic response and precise controllability of axial load.

[0024] In a preferred embodiment, the thrust assembly 82 includes: The thrust ring 821 has its upper end face hinged to the fixed ring 81 by multiple hinge rods. Multiple fixed wedges 822 are configured and are evenly fixed around the thrust ring 821. The hinge rod includes a first hinge rod 823, one end of which is hinged to the thrust ring 821, and the other end is fixed to a sliding post 825. A second hinge rod 824 is slidably disposed on the sliding post 825. The second hinge rod 824 is hinged to the fixed ring 81, and a tension spring is disposed between the sliding post 825 and the second hinge rod 824. The initial state of the tension spring is a contracted state.

[0025] The thrust ring 821 is connected to the fixed ring 81 via a hinged rod. A tension spring provides a restoring force. Fixed wedges 822 are evenly distributed around the thrust ring 821 to receive the wedge driving force from the adjustment assembly 84. The hinged rod structure allows the thrust ring 821 to tilt in the axial direction, thereby enabling the output of non-uniform axial loads.

[0026] In a preferred embodiment, the adjustment component 84 includes: Adjustment disc 841 is fixed at the output end of the loading motor 83; Multiple sliding blocks 842 are configured and evenly arranged circumferentially within the adjusting disk 841; Piston 843 is sealed and slidably disposed within the adjusting plate 841 and symmetrically fixed on both sides of the sliding block 842; The adjusting wedge 846 is fixed on the sliding block 842 and is located on the lower end face of the adjusting disk 841.

[0027] Preferably, the upper surface of the adjusting disc 841 is fixed with a plurality of connecting components, and the plurality of connecting components correspond one-to-one with a plurality of sliding blocks 842. The connecting component includes two connecting parts 844, and the two connecting parts 844 correspond to the chambers of the two pistons 843 respectively. The two connecting parts 844 are connected by a pipe, and a micro pump 845 is provided in the middle of the pipe. Both the pipe and the chamber of the piston 843 are filled with hydraulic oil.

[0028] In other words, the pistons 843 symmetrically arranged on both sides of each sliding block 842 can push the sliding block 842 to move circumferentially, thereby changing the circumferential position of the adjusting wedge 846, realizing independent and precise control of the position of each adjusting wedge 846, and providing the bearing with point-to-point differentiated axial force on the circumference.

[0029] The piston 843 and the sliding block 842 are moved by the micro pump 845 and the closed hydraulic circuit, thereby avoiding delay caused by simultaneous operation of both sides of the piston 843, which affects the adjustment response speed. Furthermore, the bidirectional operation of the micro pump 845 can drive the piston 843 to move independently in both directions, resulting in a fast dynamic response.

[0030] In addition, each of the plurality of adjusting wedges 846 corresponds one-to-one with each of the plurality of fixed wedges 822.

[0031] Depending on the required test content, whether it is a uniform or non-uniform load, the adjusting wedge 846 is adjusted accordingly. When a uniform load is required, the micro pumps 845 in the adjusting assembly 84 are controlled to operate synchronously, so that the spacing between the multiple adjusting wedges 846 is the same, that is, they are uniformly arranged in a circular pattern, thereby applying a uniform force to the multiple fixed wedges 822 synchronously. When a non-uniform load is required, the micro pumps 845 in the adjusting assembly 84 are controlled to operate separately. Each micro pump 845 drives the corresponding piston 843 and sliding block 842 to move, changing the circumferential position of the adjusting wedges 846. At this time, the multiple adjusting wedges 846 are arranged in a non-uniform circular pattern. That is to say, the contact time between the multiple adjusting wedges 846 and the fixed wedges 822 is different. The adjusting wedges 846 that contact the fixed wedges 822 first apply a larger axial load force.

[0032] In practice, firstly, the bearing to be tested is placed on the expansion shaft 72 of the clamping assembly 7, and the expansion shaft 72 is started to expand radially, centering and tightening the inner ring of the bearing. Then, multiple clamping blocks 74 on the side wall of the test groove 73 are driven to extend synchronously and press the outer ring of the bearing from the outside to complete the stable installation of the test piece. Next, start the lifting cylinder 3 to push the lifting platform 6 to rise steadily along the column 5. When the bearing on the clamping component 7 approaches the loading component 8, observe the position until the two are about to contact. At this time, the output end of the control limit cylinder 63 extends out and embeds into the limit groove 62 of the two limit columns 61 on the lifting platform 6 to achieve rigid limit and ensure the precise alignment and parallelism between the loading component 8 and the bearing end face. After determining the test content, loading and testing are performed. The loading motor 83 is started, driving the adjustment disk 841 to rotate. The adjustment wedge 846 rotates with the adjustment disk 841. By pressing the corresponding fixed wedge 822 through the wedge surface, the resistance of the tension spring in the hinge rod is overcome, and the thrust ring 821 is pushed to apply a precise axial load to the end face of the bearing under test. Since the position of each adjustment wedge 846 has been set as needed, a preset uniform or non-uniform load distribution can be generated on the circumference of the bearing end face. At the same time, the test motor drives the expansion shaft 72 to rotate, and tests whether the bearing under test can rotate smoothly under axial load. Finally, after the test is completed, the loading motor 83 and each micro pump 845 reverse their actions to reset the adjusting wedge 846, control the lifting cylinder 3 to descend slowly, and at the same time the limit cylinder 63 exits the limit groove 62. After the lifting platform 6 descends to the low position, the clamping block 74 is released and the expansion shaft 72 is retracted, and the tested bearing is removed, thus ending the test.

[0033] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-precision bearing axial load testing device based on annular wedge disk, characterized in that, include: The bracket (1) has a lifting cylinder (3) fixed inside it. The base (2) is fixed to the upper surface of the bracket (1), and the output end of the lifting cylinder (3) passes through the base (2). The top plate (4) is fixed above the base (2) by multiple columns (5); The lifting platform (6) is slidably mounted on multiple columns (5), and its bottom is connected to the output end of the lifting cylinder (3); The clamping assembly (7) is fixed to the upper end face of the lifting platform (6); The loading component (8) is fixed to the lower end face of the top plate (4) and corresponds to the position of the clamping component (7); The loading component (8) includes: A fixing ring (81) is fixed to the lower end face of the top plate (4); The thrust assembly (82) is disposed on the lower end face of the fixed ring (81); The loading motor (83) is fixed on the upper surface of the top plate (4), and an adjustment component (84) is fixed at its output end. The adjustment component (84) is in contact with the thrust component (82) for transmission. The thrust assembly (82) includes: The thrust ring (821) has multiple hinge rods on its upper end face that are hinged to the fixed ring (81); Multiple fixed wedges (822) are configured and are circumferentially fixed on the thrust ring (821); The hinge rod includes a first hinge rod (823), one end of which is hinged to the thrust ring (821), and the other end is fixed with a sliding column (825). A second hinge rod (824) is slidably arranged on the sliding column (825). The second hinge rod (824) is hinged to the fixed ring (81), and a tension spring is provided between the sliding column (825) and the second hinge rod (824). The initial state of the tension spring is a contracted state. The adjustment component (84) includes: An adjustment disc (841) is fixed at the output end of the loading motor (83); Multiple sliding blocks (842) are configured and evenly arranged circumferentially within the adjusting disk (841); The piston (843) is sealed and slidably disposed within the adjusting disc (841) and symmetrically fixed on both sides of the sliding block (842); The adjusting wedge (846) is fixed on the sliding block (842) and located on the lower end face of the adjusting disk (841); The upper surface of the adjusting plate (841) is fixed with a plurality of connecting components, and the plurality of connecting components correspond one-to-one with a plurality of sliding blocks (842). The connecting components include two connecting parts (844), and the two connecting parts (844) correspond to the chambers of the two pistons (843) respectively. The two connecting parts (844) are connected by a pipe. A micro pump (845) is provided in the middle of the pipe, and the pipe and the chamber of the piston (843) are filled with hydraulic oil.

2. The high-precision bearing axial load testing device based on an annular wedge disk as described in claim 1, characterized in that, The upper end of the lifting platform (6) is symmetrically fixed with two limiting posts (61). Each of the two limiting posts (61) has a limiting groove (62) on the side that is close to each other. Two limiting cylinders (63) are symmetrically fixed on the top plate (4). A clearance groove is provided on the top plate (4). The clearance groove is slidably connected to the limiting post (61). When the clamping component (7) contacts the loading component (8), the output end of the limiting cylinder (63) is embedded in the limiting groove (62) to complete the limiting.

3. The axial load testing device for high-precision bearings based on an annular wedge disk as described in claim 1, characterized in that, The clamping assembly (7) includes: The test plate (71) is fixed on the lifting platform (6), and a test motor is fixed inside it; An expansion shaft (72) is rotatably positioned at the center of the test disk (71) and is fixedly connected to the output end of the test motor. Test slot (73) is provided on the upper surface of the test plate (71); Clamping blocks (74) are configured in multiples, evenly arranged around the sidewall of the test slot (73), and are driven by pneumatic or hydraulic pressure.

4. The axial load testing device for high-precision bearings based on an annular wedge disk as described in claim 3, characterized in that, The height of the upper end face of the expansion shaft (72) is lower than the height of the upper end face of the test disk (71).

5. The high-precision bearing axial load testing device based on an annular wedge disk as described in claim 1, characterized in that, Each of the multiple adjusting wedges (846) corresponds to one of the multiple fixed wedges (822).

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