A bearing shell testing device and a bearing shell testing method

Abstract

This invention provides a bearing test apparatus and method, relating to the field of engine bearing testing technology. The bearing test apparatus includes a drive structure, a test shaft, a mounting component, a hydraulic system, a force transmission structure, a camshaft, and a transmission structure. The drive structure drives the test shaft to rotate, and the transmission structure drives the camshaft to rotate synchronously with the test shaft. The bearing to be tested is mounted between the test shaft and the mounting component. The hydraulic system applies hydraulic pressure to the force transmission structure, and the cam on the camshaft presses against the force transmission structure to apply a cam force. The force transmission structure applies a load to the bearing. In other words, this bearing test apparatus adjusts the bearing load through the combined action of hydraulic pressure and cam force. The cam force changes according to the cam profile, and the hydraulic pressure can be adjusted through the hydraulic system, thereby more accurately simulating the load changes experienced by the bearing during operation and obtaining more accurate test results.

Description

Technical Field

[0001] This invention relates to the field of engine bearing testing technology, and more specifically, to a bearing testing device and a bearing testing method. Background Technology

[0002] As a core component of an engine, the performance indicators of bearings directly determine the reliability of engine operation. Therefore, it is necessary to verify the technical indicators and performance of bearings through relevant platform tests. Only after all indicators meet the design requirements can engine matching tests be carried out. Otherwise, unpredictable losses may occur after the bearings are matched with the engine.

[0003] Currently, sapphire testing is often used to test the performance of bearings during the design phase. However, since the test specimens and test principles used in sapphire testing differ significantly from the actual working conditions of bearings, they cannot reflect the actual working conditions of bearings after they are installed in the engine. Therefore, the test results cannot effectively guide the design and selection of bearings for high-speed, high-power diesel engines.

[0004] To enable bearing platform tests to more realistically reflect the actual working process of bearings, relevant universities, research institutions, and enterprises have designed hydraulically driven bearing test benches to test and verify the relevant performance of bearings. Theoretically, hydraulically driven bearing test benches can simulate various loads borne by bearings during operation by controlling hydraulic pressure, and assess the performance indicators of bearings. However, in actual platform tests, due to various limitations, hydraulic pressure is mostly applied to the bearings in the form of constant load, sine wave, or square wave, which still differs from the actual load borne by the bearings during operation. Summary of the Invention

[0005] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0006] The present invention aims to provide a bearing test device that can more accurately simulate the actual load borne by the bearing during engine operation and apply it to the bearing to be tested in order to obtain more accurate test results.

[0007] The present invention also aims to provide a bearing test method that can more accurately simulate the actual load borne by the bearing during engine operation and apply it to the bearing to be tested in order to obtain more accurate test results.

[0008] The embodiments of the present invention can be implemented in the following ways:

[0009] A bearing bush testing device includes a drive structure, a test shaft, a mounting component, and a hydraulic system. The drive structure drives the test shaft to rotate. The mounting component is installed outside the test shaft, and a bearing bush to be tested is mounted between the test shaft and the mounting component. The bearing bush testing device further includes:

[0010] A force transmission structure, wherein the hydraulic system is used to apply hydraulic pressure to the force transmission structure;

[0011] A camshaft, wherein a cam on the camshaft is used to press against the force transmission structure to apply a cam force to the force transmission structure; the force transmission structure is used to transmit the hydraulic pressure and the cam force to the mounting member to apply a load to the bearing bush; and

[0012] A transmission structure is provided, which is connected to the camshaft and the test shaft respectively, so as to drive the camshaft to rotate synchronously with the test shaft.

[0013] Optionally, the force transmission structure includes a movable plate, a hydraulic seat, a hydraulic push rod, a hydraulic piston, and a spring; the bearing test device also includes a frame, and the hydraulic seat is fixedly connected to the frame; the hydraulic push rod and the movable plate are slidably disposed within the hydraulic seat, and the hydraulic push rod, the movable plate, and the hydraulic seat define a hydraulic cavity, the hydraulic cavity being connected to the hydraulic system, and the hydraulic push rod being used to slide relative to the hydraulic seat under the action of the hydraulic oil in the hydraulic cavity;

[0014] The hydraulic piston slides in conjunction with the hydraulic push rod, and the hydraulic push rod is used to apply hydraulic pressure to the hydraulic piston. The cam presses against the movable plate to apply cam force to the hydraulic piston through the movable plate. One end of the spring is connected to the hydraulic piston, and the spring is used to generate spring force under the action of the hydraulic pressure and the cam force. The other end of the spring is used to apply elastic force to the mounting component to apply load to the bearing.

[0015] Optionally, the force transmission structure further includes a thrust rod, one end of which is slidably engaged with the hydraulic piston, and the other end of which abuts against the mounting component. The two ends of the spring are respectively connected to the hydraulic piston and the thrust rod to apply an elastic force to the mounting component through the thrust rod.

[0016] Optionally, the bearing test device further includes an angle sensor for detecting the rotation angle of the camshaft, and the hydraulic system for controlling the magnitude of the hydraulic pressure applied to the force transmission structure according to the rotation angle.

[0017] Optionally, the bearing test device further includes an eccentric block mounted on the test shaft, with the eccentric block provided on both sides of the mounting component.

[0018] Optionally, the drive structure includes a drive motor, a first coupling, a torque meter, and a second coupling. The drive motor, the first coupling, the torque meter, and the second coupling are connected in sequence. The end of the second coupling away from the torque meter is fixedly connected to the test shaft to transmit the rotation of the drive motor to the test shaft.

[0019] The torque meter is used to detect the instantaneous torque between the drive motor and the test shaft, and the motor is used to stop when the instantaneous torque exceeds a threshold.

[0020] Optionally, the bearing test device further includes a lubrication system. The test shaft is provided with a first lubrication oil passage for lubricating the bearing. The bearing test device is provided with a second lubrication oil passage for lubricating the camshaft. The lubrication system is used to supply lubricating oil to the first lubrication oil passage and the second lubrication oil passage.

[0021] Optionally, the bearing test device further includes a first temperature sensor and a first pressure sensor, wherein the first temperature sensor is used to detect the temperature of the lubricating oil in the lubrication system, and the first pressure sensor is used to detect the pressure of the lubricating oil in the lubrication system.

[0022] Optionally, the bearing testing device further includes a second temperature sensor and a second pressure sensor, the second temperature sensor being used to detect the temperature of the hydraulic oil in the hydraulic system, and the second pressure sensor being used to detect the pressure of the hydraulic oil in the hydraulic system; and / or,

[0023] The bearing test apparatus further includes a bearing temperature sensor, which is used to detect the temperature during the bearing test; and / or

[0024] The bearing test device also includes an angular displacement sensor mounted on the test shaft, which is used to collect the axis trajectory signal of the test shaft.

[0025] A bearing bush testing method, using the aforementioned bearing bush testing apparatus, characterized in that the bearing bush testing method includes:

[0026] The bearing bush to be tested is installed onto the test shaft using the mounting hardware;

[0027] The test shaft is controlled to rotate synchronously with the camshaft so as to apply a load to the bearing bush through the cam;

[0028] The hydraulic system is controlled according to the rotation angle of the camshaft to apply a load to the bearing bush via the hydraulic system;

[0029] The load applied by the cam to the bearing bush is used to simulate the load on the bearing bush during the non-power stroke, and the load applied by the hydraulic system to the bearing bush is used to simulate the load on the bearing bush during the power stroke.

[0030] The beneficial effects of the bearing testing apparatus and bearing testing method provided in the embodiments of the present invention include:

[0031] The bearing bush testing device provided in the embodiments of the present invention includes a drive structure, a test shaft, a mounting component, a hydraulic system, a force transmission structure, a camshaft, and a transmission structure. The drive structure is connected to the test shaft, thereby driving the test shaft to rotate. The transmission structure is connected to both the camshaft and the test shaft, thereby driving the camshaft to rotate synchronously with the test shaft. The mounting component is installed outside the test shaft, and the bearing bush to be tested is installed between the test shaft and the mounting component. The hydraulic system is used to apply hydraulic pressure to the force transmission structure. The cam on the camshaft is used to press against the force transmission structure to apply a cam force to the force transmission structure. The force transmission structure is used to transmit the hydraulic pressure and the cam force to the mounting component, thereby applying a load to the bearing bush. That is, this bearing bush testing device adjusts the bearing bush load through the combined action of hydraulic pressure and cam force. The cam force changes according to the cam profile, and the hydraulic pressure can be adjusted through the hydraulic system, thereby more accurately simulating the load changes experienced by the bearing bush during operation and obtaining more accurate test results.

[0032] The embodiments of the present invention also provide a bearing test method, which is implemented by the bearing test device described above. Therefore, the bearing test method also has the beneficial effect of being able to more accurately simulate the load changes that the bearing is subjected to during operation, thereby obtaining more accurate test results. Attached Figure Description

[0033] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0034] Figure 1 A schematic diagram of the bearing test apparatus provided according to one aspect of the present invention is shown;

[0035] Figure 2 A schematic diagram of the force transmission structure in the bearing test apparatus provided according to one aspect of the present invention is shown.

[0036] Figure label:

[0037] 100-Bearing bearing testing device; 1-Frame; 101-Base; 102-Support leg; 103-Mounting plate; 104-Mounting hole; 2-Drive motor; 3-First coupling; 4-Torque meter; 5-Second coupling; 6-Drive gear; 7-Support bearing seat; 8-Support lower bearing; 9-Eccentric block; 10-Test bearing seat; 11-Bearing bearing; 12-Test shaft; 13-Angular displacement sensor; 14-Support upper bearing; 15-Support bearing cover; 16-Test bearing cover; 17-Thrust rod; 18-Hydraulic seat; 19-Hydraulic piston; 191-Large diameter rod section; 192-Small diameter rod section; 20-Hydraulic... Push rod; 201-Limit protrusion; 21-Spring; 22-First pressure sensor; 23-First temperature sensor; 24-Second pressure regulating valve; 25-Lubricating oil pump; 26-High pressure oil pump; 27-Pressure relief valve; 28-Three-way solenoid valve; 29-First pressure regulating valve; 30-Second pressure sensor; 31-Second temperature sensor; 32-Driven gear; 33-Timing belt; 34-Camshaft; 35-Cam bearing housing; 36-Cam bushing; 37-Angle sensor; 38-Cam; 39-Controller; 40-First lubrication circuit; 41-Second lubrication circuit; 42-Moving plate. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0039] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does 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, and therefore should not be construed as a limitation of this invention.

[0040] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable 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, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Figure 1 A schematic diagram of the bearing testing device 100 provided in this embodiment is shown. Please refer to... Figure 1 This embodiment provides a bearing bush testing device 100, which includes a drive structure, a test shaft 12, a mounting component, a hydraulic system, a force transmission structure, a camshaft 34, and a transmission structure. The drive structure is connected to the test shaft 12, thereby driving the test shaft 12 to rotate. The transmission structure is connected to both the camshaft 34 and the test shaft 12, thereby causing the camshaft 34 to rotate synchronously with the test shaft 12. The mounting component is installed outside the test shaft 12, and the bearing bush 11 to be tested is installed between the test shaft 12 and the mounting component. The hydraulic system is used to apply hydraulic pressure to the force transmission structure. The cam 38 on the camshaft 34 is used to press against the force transmission structure to apply a cam force to the force transmission structure. The force transmission structure is used to transmit the hydraulic pressure and the cam force to the mounting component, thereby applying a load to the bearing bush 11. That is, the bearing bush testing device 100 adjusts the load on the bearing bush 11 through the combined action of hydraulic pressure and cam force. The cam force changes according to the profile of the cam 38, and the hydraulic pressure can be adjusted through the hydraulic system, thereby more accurately simulating the load changes experienced by the bearing bush 11 during operation and obtaining more accurate test results.

[0043] The bearing test apparatus 100 provided in this embodiment will be further described below.

[0044] The bearing bush testing device 100 includes a frame 1, and other components of the bearing bush testing device 100 are mounted on the frame 1. Specifically, the frame 1 includes a base 101, and the drive structure of the bearing bush testing device 100 and the test shaft 12 are all mounted on the base 101. The frame 1 also includes a support leg 102 and a mounting plate 103. The lower end of the support leg 102 is fixedly connected to the base 101, and its upper end is fixedly connected to the mounting plate 103, thereby supporting the mounting plate 103 on the upper side of the base 101.

[0045] The drive unit includes a drive motor 2, a first coupling 3, a torque meter 4, and a second coupling 5. The drive motor 2, the first coupling 3, the torque meter 4, the second coupling 5, and the test shaft 12 are connected sequentially. Thus, the torque of the drive motor 2 is transmitted to the test shaft 12 through the first coupling 3, the torque meter 4, and the second coupling 5. By configuring the drive unit to connect to the test shaft 12 via couplings, the alignment parameters between the test shaft 12 and the motor shaft of the drive motor 2 can be manually adjusted as needed to verify the impact of the alignment parameters on the performance of the bearing bush 11, thereby guiding the alignment relationship of the test shaft 12.

[0046] Meanwhile, the torque meter 4, located between the first coupling 3 and the second coupling 5, can detect the instantaneous torque between the drive motor 2 and the test shaft 12. The drive motor 2 is used to stop the machine when the instantaneous torque exceeds the threshold.

[0047] Furthermore, the bearing test device 100 also includes a controller 39, which in this embodiment is an ECU. Figure 1 The dashed lines in the diagram represent the electrical connections between the controller 39 and the various electronic components.

[0048] Optionally, the controller 39 is electrically connected to each electronic component via wires, therefore Figure 1 The dotted line in the diagram can also be seen as a representation of an electrical wire. Electronic components refer to parts of the bearing test apparatus 100 that can be controlled or have data acquired (e.g., by sensors) via the controller 39.

[0049] Both the torque meter 4 and the drive motor 2 are electrically connected to the controller 39. The torque meter 4 sends a signal representing the instantaneous torque collected to the controller 39. After receiving the signal, the controller 39 processes the signal containing...

[0050] The instantaneous torque data is analyzed and stored. At the same time, if the instantaneous torque value is greater than the threshold, a stop signal is sent to drive motor 2 to protect drive motor 2 and other components.

[0051] The frame 1 also includes support bearing seats 7 mounted on the base 101. Two support bearing seats 7 are spaced apart along the axial direction of the test shaft 12, thus supporting both ends of the test shaft 12. Support bearing seats 7 also have support bearing covers 15, forming a through hole between the support bearing seats 7 and the support bearing covers 15 for the test shaft 12 to pass through. The ends of the test shaft 12 are fixed by the connection between the support bearing seats 7 and the support bearing covers 15. The drive motor 2 is placed on the base 101 and is arranged in a straight line with the two support bearing seats 7. Further...

[0052] Between the support tile seat 7 and the test shaft 12, a lower support tile 8 is also provided, and between the support tile cover 15 and the test shaft 12, an upper support tile 14 is also provided.

[0053] The mounting components include interconnected test tile cover 16 and test tile base 10, the test tile cover 16 and test...

[0054] A through hole is formed between the bearing seats 10, allowing the test shaft 12 to pass through, thereby fitting the mounting component onto the test shaft 120. Simultaneously, the gap between the through hole and the test shaft 12 serves as space for mounting the bearing bush 11; that is, during use, the through hole...

[0055] By connecting the test bearing cover 16 and the test bearing seat 10, the bearing 11 is installed on the test shaft 12.

[0056] Furthermore, the bearing test device 100 also includes eccentric blocks 9 mounted on the test shaft 12, with each eccentric block 9 provided on both sides of the mounting component. In this embodiment, there are two eccentric blocks 9.

[0057] One of the eccentric blocks 9 is located between the mounting component and a support bearing seat 7, and the other of the two eccentric blocks 9 is located between the mounting component and another support bearing seat 7. By setting the eccentric blocks 9, the bearing 11 can be simulated.

[0058] The amount of balance that the shaft system bears during actual operation.

[0059] Optionally, the eccentric block 9 is detachably connected to the test shaft 12 by bolts, and correspondingly, the test shaft 12 is provided with threaded holes for bolt connection. During the test, eccentric blocks 9 of different specifications can be matched according to requirements to ensure that the shaft imbalance borne by the bearing bush 11 meets the test requirements. The required imbalance generated by the eccentric block 9 is determined based on the imbalance generated by the engine crankshaft in which the tested bearing bush 11 is actually used. Specifically, the imbalance generated by the eccentric block 9 is greater than or equal to the imbalance generated by the crankshaft in which the tested bearing bush 11 is actually used.

[0060] The mounting plate 103 has two spaced-apart cam bearing seats 35, each with a cam bushing 36. Both ends of the camshaft 34 are mounted to the cam bearing seats 35 via the cam bushings 36, thus positioning the camshaft 34 directly above the test shaft 12. The lower end of the transmission structure is connected to the test shaft 12, and the upper end is connected to the camshaft 34, thereby driving the camshaft 34 to rotate synchronously with the test shaft 12.

[0061] Optionally, the transmission structure includes a driving gear 6, a driven gear 32, and a timing belt 33. The driving gear 6 is fixedly connected to the test shaft 12, forming the lower end of the transmission structure. The driven gear 32 is fixedly connected to the camshaft 34, forming the upper end of the transmission structure. The timing belt 33 meshes with both the driving gear 6 and the driven gear 32, thereby transmitting the rotation of the driving gear 6 to the driven gear 32, and driving the camshaft 34 to rotate via the driven gear 32. It is understood that in other embodiments, other transmission methods may also be used, such as direct power transmission through the meshing of two gears.

[0062] A cam 38 is mounted on the camshaft 34, located directly above the mounting component. A force transmission structure is mounted on the lower side of the mounting plate 103, between the cam 38 and the mounting component. The cam 38 applies a cam force to the mounting component through the force transmission structure. This cam force applied to the mounting component is used to simulate a portion of the load experienced by the bearing bush 11 during actual operation. A hydraulic system applies hydraulic pressure to the mounting component through the force transmission structure. This hydraulic pressure applied to the mounting component is used to simulate another portion of the load experienced by the bearing bush 11 during actual operation.

[0063] Figure 2 A schematic diagram of the force transmission structure in the bearing test apparatus 100 provided in this embodiment is shown. Please refer to the attached diagram. Figure 1 and Figure 2 Optionally, the force transmission structure includes a movable plate 42, a hydraulic seat 18, a hydraulic push rod 20, a hydraulic piston 19, and a spring 21. A mounting hole 104 is provided on the mounting plate 103, located directly below the cam 38. The hydraulic seat 18 is fixedly connected to the mounting hole 104 and has a tubular structure. The movable plate 42 and the hydraulic push rod 20 are slidably disposed within the hydraulic seat 18. The movable plate 42 is a plate-shaped component that can close the opening at one end of the hydraulic seat 18. The movable plate 42, the hydraulic push rod 20, and the hydraulic seat 18 define a hydraulic cavity. The hydraulic system communicates with this hydraulic cavity. By filling or releasing hydraulic oil into the hydraulic cavity, the hydraulic pressure is changed, thereby changing the load applied to the bearing 11.

[0064] The hydraulic push rod 20 is also generally tubular, with a radially inwardly extending limiting protrusion 201 at its upper opening. The limiting protrusion 201 has an annular structure. The hydraulic piston 19 includes a large-diameter rod section 191 and a small-diameter rod section 192 connected to each other. The small-diameter rod section 192 is located above the large-diameter rod section 191, and passes through the opening formed by the limiting protrusion 201 and abuts against the movable plate 42. Thus, when the movable plate 42 moves downward under the pressure of the cam 38, the hydraulic piston 19 is subjected to downward pressure and moves downward synchronously with the movable plate 42. The large-diameter rod section 191 is located inside the hydraulic push rod 20, and its end near the small-diameter rod section 192 abuts against the limiting protrusion 201. While the hydraulic push rod 20 moves downward under hydraulic pressure, it pushes the hydraulic piston 19 downward. Spring 21 is located on the lower side of hydraulic push rod 20, and the upper end of spring 21 is connected to hydraulic push rod 20. During the downward movement of hydraulic push rod 20, spring 21 is compressed and deformed. At this time, the lower end of spring 21 is used to apply a downward elastic force to test bearing cover 16, thereby simulating the load on bearing 11.

[0065] Furthermore, the force transmission structure also includes a thrust rod 17. One end of the thrust rod 17 slides in conjunction with the hydraulic piston 19, and the other end abuts against the mounting component. The two ends of the spring 21 are respectively connected to the hydraulic piston 19 and the thrust rod 17, thereby applying an elastic force to the mounting component through the thrust rod 17. The spring 21 is sleeved on the thrust rod 17, so the thrust rod 17 not only serves as a component that applies load to the test cover 16, but also as a guide for the spring 21, ensuring that the elastic force generated by the spring 21 is always directed in the direction of vertically pressing the test cover 16.

[0066] To ensure that the load borne by the bearing bush 11 on the bearing bush testing device 100 is consistent with the load borne by the bearing bush 11 during engine operation, the profile of the cam 38, the timing of hydraulic system oil supply, the hydraulic system oil supply pressure, the area of ​​the hydraulic piston 19, and the stiffness of the spring 21 need to be matched and designed. The load applied by the bearing bush testing device 100 is calibrated by the measured pressure inside the engine cylinder. Specifically, in this embodiment, the cam 38 is set to simulate the gas force generated during the non-working process inside the cylinder, and the hydraulic system is set to simulate the gas force generated during the combustion of combustible gas inside the cylinder during the working process. The load generated by the cam 38 and the hydraulic system simulates the gas force inside the cylinder during engine operation, and finally passes through the thrust rod 17 to the bearing bush 11, simulating the actual load borne by the bearing bush 11.

[0067] In this embodiment, the hydraulic system includes a high-pressure oil pump 26, a first pressure regulating valve 29, a three-way solenoid valve 28, and a pressure limiting valve 27 connected in sequence. The high-pressure oil pump 26 pumps hydraulic oil sequentially along the first pressure regulating valve 29, the three-way solenoid valve 28, and the pressure limiting valve 27, and finally pumps it into the hydraulic chamber in the force transmission structure. The three-way solenoid valve 28 is electrically connected to the controller 39, and the opening and closing phases of the three-way solenoid valve 28 are calibrated and matched according to the camshaft 34 rotation angle and the angular range of the engine's power stroke.

[0068] Specifically, the process of simulating the gas force generated during non-working processes by cam 38 is as follows: based on the cylinder pressure data collected when a cylinder of the engine is shut down, the data is converted into a load curve on the bearing 11 by combining structural parameters such as bearing 11 and shaft diameter; the spring 21 is matched with appropriate stiffness according to the force condition of bearing 11, and the elastic force generated by spring 21 is calibrated by the collected force curve of bearing 11, so that during the operation of cam 38, the elastic force generated by compressing spring 21 by cam force alone is consistent with the load borne by bearing 11 during cylinder shutdown. The process of simulating the gas force during power stroke using hydraulic pressure is as follows: Based on the explosion pressure data collected during normal engine operation, and combined with structural parameters such as the bearing bush 11 and shaft diameter, this data is converted into a load curve acting on the bearing bush 11. Based on parameters such as the area of ​​the hydraulic piston 19, the load curve borne by the bearing bush 11 during power stroke, and the stiffness of the spring 21, the hydraulic system's oil supply pressure, the opening and closing times of the three-way solenoid valve 28's inlet valve, and the opening time of the three-way solenoid valve 28's drain valve are appropriately matched. Using the force curve of the bearing bush 11 collected during the engine's power stroke as a benchmark, the matched hydraulic system's oil supply pressure, the opening and closing times of the three-way solenoid valve 28, the area of ​​the hydraulic piston 19, and the stroke of the hydraulic piston 19 are calibrated to ensure that the combined effect of the hydraulic pressure generated by the hydraulic oil and the cam force generated by the cam 38 is consistent with the effect of the in-cylinder explosion pressure. Finally, based on the ultimate load that the bearing bush 11 can withstand, the maximum oil supply pressure that can be applied during the test is calculated. This oil supply pressure is used as the input during the test to verify the bearing capacity limit of the bearing bush 11.

[0069] The bearing testing device 100 also includes an angle sensor 37 mounted on the camshaft 34. The angle sensor 37 is used to detect the rotation angle of the camshaft 34, so that the hydraulic system can control the magnitude of the hydraulic pressure applied to the force transmission structure according to the rotation angle. Specifically, the angle sensor 37 is electrically connected to the controller 39, and the three-way solenoid valve 28 of the hydraulic system is also electrically connected to the controller 39. The angle sensor 37 transmits a signal characterizing the detected rotation angle to the controller 39, and the controller 39 controls the opening and closing of the three-way solenoid valve 28 and the oil supply pressure of the three-way solenoid valve 28 according to the angle signal.

[0070] Furthermore, a limit oil hole (not shown in the figure) is provided on the hydraulic seat 18. When the relative movement between the hydraulic piston 19 and the hydraulic push rod 20 exceeds the design value, the hydraulic oil flows out from the limit oil hole to protect the force transmission structure from being damaged.

[0071] In this embodiment, the bearing test device 100 also includes a lubrication system. A first lubrication oil passage 40 is provided on the test shaft 12 for lubricating the bearing 11. The bearing test device 100 also has a second lubrication oil passage 41 for lubricating the camshaft 34. The lubrication system is used to supply lubricating oil to the first lubrication oil passage 40 and the second lubrication oil passage 41.

[0072] Specifically, the lubrication system includes a lubricating oil pump 25 and a second pressure regulating valve 24 connected in sequence. The lubricating oil pump 25 delivers lubricating oil to the second pressure regulating valve 24 and then to the first lubricating oil passage 40 and the second lubricating oil passage 41. The first lubricating oil passage 40 has openings located at the support bearing cover 15, the support bearing seat 7, the test bearing cover 16, and the test bearing seat 10, thereby providing lubrication and cooling for the rotating support positions at both ends of the test shaft 12 and the bearing 11. The second lubricating oil passage 41 is located at the cam bearing seat 35, thereby providing lubrication and cooling for the rotating support positions at both ends of the camshaft 34.

[0073] Furthermore, the bearing bush testing device 100 also includes a first temperature sensor 23 and a first pressure sensor 22. The first temperature sensor 23 is used to detect the temperature of the lubricating oil in the lubrication system, and the first pressure sensor 22 is used to detect the pressure of the lubricating oil in the lubrication system. Both the first temperature sensor 23 and the first pressure sensor 22 are electrically connected to the controller 39, thereby allowing the controller 39 to store and analyze the temperature and pressure data of the lubricating oil in the lubrication system, thus providing data support for analyzing the impact of the temperature and pressure of the lubricating oil on the performance of the bearing bush 11.

[0074] Furthermore, the bearing bush testing device 100 also includes a second temperature sensor 31 and a second pressure sensor 30. The second temperature sensor 31 is used to detect the temperature of the hydraulic oil in the hydraulic system, and the second pressure sensor 30 is used to detect the pressure of the hydraulic oil in the hydraulic system. Both the second temperature sensor 31 and the second pressure sensor 30 are electrically connected to the controller 39, thereby allowing the controller 39 to store and analyze the temperature and pressure data of the hydraulic oil in the hydraulic system. This provides data support for analyzing the impact of the temperature and pressure of the hydraulic oil on the performance of the bearing bush 11. At the same time, the controller 39 can also control the three-way solenoid valve 28 based on the pressure value detected by the second force sensor.

[0075] In this embodiment, the bearing test apparatus 100 also includes a bearing temperature sensor (not shown), which is used to detect the temperature of the bearing 11 during the test. The controller 39 is electrically connected to the bearing temperature sensor to obtain the temperature of the bearing 11 during the test, thereby determining whether the bearing 11 has failed.

[0076] In this embodiment, the bearing testing device 100 further includes an angular displacement sensor 13 mounted on the test shaft 12. The angular displacement sensor 13 is used to acquire the axis trajectory signal of the test shaft 12. The angular displacement sensor 13 is electrically connected to the controller 39, thereby allowing the controller 39 to store and analyze the axis trajectory of the test shaft 12.

[0077] Accordingly, embodiments of the present invention also provide a bearing test method, which can be implemented based on the bearing test apparatus 100 described above. Specifically, the bearing test method includes:

[0078] S01: Install the bearing shell 11 to be tested onto the test shaft 12 using the mounting components.

[0079] S02: Control the test shaft 12 to rotate synchronously with the camshaft 34, thereby applying a load to the bearing bush 11 through the cam 38.

[0080] The controller 39 controls the start of the drive motor 2, thereby driving the test shaft 12 to rotate. The camshaft 34 rotates synchronously with the camshaft 34 under the drive of the transmission structure.

[0081] S03: Control the hydraulic system according to the rotation angle of the camshaft 34 to apply load to the bearing 11 through the hydraulic system.

[0082] The controller 39 controls the opening and closing of the three-way solenoid valve 28 and the oil supply pressure in the hydraulic system based on the rotation angle signal obtained by the angle sensor 37 and the preset curve of the relationship between the rotation angle of the camshaft 34 and the hydraulic oil supply pressure, thereby adjusting the load applied by the hydraulic system to the bearing 11.

[0083] The load applied by the cam 38 to the bearing 11 is used to simulate the load on the bearing 11 during the non-power stroke, while the load applied by the hydraulic system to the bearing 11 is used to simulate the load on the bearing 11 during the power stroke.

[0084] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A bearing shell testing device comprising a driving structure for driving a test shaft to rotate, a test shaft, a mounting member mounted outside the test shaft, and a hydraulic system, wherein a bearing shell to be tested is mounted between the test shaft and the mounting member, characterized in that, The bearing test device also includes: A force transmission structure, wherein the hydraulic system is used to apply hydraulic pressure to the force transmission structure; A camshaft, wherein a cam on the camshaft is used to press against the force transmission structure to apply a cam force to the force transmission structure; the force transmission structure is used to transmit the hydraulic pressure and the cam force to the mounting member to apply a load to the bearing bush; and A transmission structure is provided, which is connected to the camshaft and the test shaft respectively, so as to drive the camshaft to rotate synchronously with the test shaft; The force transmission structure includes a movable plate, a hydraulic seat, a hydraulic push rod, a hydraulic piston, and a spring; the bearing test device also includes a frame, and the hydraulic seat is fixedly connected to the frame; the hydraulic push rod and the movable plate are slidably disposed in the hydraulic seat, and the hydraulic push rod, the movable plate, and the hydraulic seat define a hydraulic cavity, the hydraulic cavity is connected to the hydraulic system, and the hydraulic push rod is used to slide relative to the hydraulic seat under the action of the hydraulic oil in the hydraulic cavity; The hydraulic piston slides in conjunction with the hydraulic push rod, and the hydraulic push rod is used to apply hydraulic pressure to the hydraulic piston. The cam presses against the movable plate to apply cam force to the hydraulic piston through the movable plate. One end of the spring is connected to the hydraulic piston, and the spring is used to generate spring force under the action of the hydraulic pressure and the cam force. The other end of the spring is used to apply elastic force to the mounting component to apply load to the bearing.

2. The bearing test apparatus according to claim 1, characterized in that, The force transmission structure also includes a thrust rod, one end of which is slidably engaged with the hydraulic piston, and the other end of which abuts against the mounting component. The two ends of the spring are respectively connected to the hydraulic piston and the thrust rod, so as to apply an elastic force to the mounting component through the thrust rod.

3. The bearing test apparatus according to claim 1, characterized in that, The bearing test device also includes an angle sensor, which is used to detect the rotation angle of the camshaft, and the hydraulic system is used to control the magnitude of the hydraulic pressure applied to the force transmission structure according to the rotation angle.

4. The bearing test apparatus according to claim 1, characterized in that, The bearing test device also includes an eccentric block mounted on the test shaft, with the eccentric block provided on both sides of the mounting component.

5. The bearing test apparatus according to claim 1, characterized in that, The drive structure includes a drive motor, a first coupling, a torque meter, and a second coupling. The drive motor, the first coupling, the torque meter, and the second coupling are connected in sequence. The end of the second coupling away from the torque meter is fixedly connected to the test shaft to transmit the rotation of the drive motor to the test shaft. The torque meter is used to detect the instantaneous torque between the drive motor and the test shaft, and the motor is used to stop when the instantaneous torque exceeds a threshold.

6. The bearing test apparatus according to claim 1, characterized in that, The bearing test device also includes a lubrication system. The test shaft is provided with a first lubrication oil passage for lubricating the bearing. The bearing test device is provided with a second lubrication oil passage for lubricating the camshaft. The lubrication system is used to supply lubricating oil to the first lubrication oil passage and the second lubrication oil passage.

7. The bearing test apparatus according to claim 6, characterized in that, The bearing test device further includes a first temperature sensor and a first pressure sensor. The first temperature sensor is used to detect the temperature of the lubricating oil in the lubrication system, and the first pressure sensor is used to detect the pressure of the lubricating oil in the lubrication system.

8. The bearing test apparatus according to any one of claims 1-7, characterized in that, The bearing testing device further includes a second temperature sensor and a second pressure sensor. The second temperature sensor is used to detect the temperature of the hydraulic oil in the hydraulic system, and the second pressure sensor is used to detect the pressure of the hydraulic oil in the hydraulic system; and / or... The bearing test apparatus further includes a bearing temperature sensor, which is used to detect the temperature during the bearing test; and / or The bearing test device also includes an angular displacement sensor mounted on the test shaft, which is used to collect the axis trajectory signal of the test shaft.

9. A bearing bush testing method, using the bearing bush testing apparatus as described in any one of claims 1-8, characterized in that, The bearing test method includes: The bearing bush to be tested is installed onto the test shaft using the mounting hardware; The test shaft is controlled to rotate synchronously with the camshaft so as to apply a load to the bearing bush through the cam; The hydraulic system is controlled according to the rotation angle of the camshaft to apply a load to the bearing bush via the hydraulic system; The load applied by the cam to the bearing bush is used to simulate the load on the bearing bush during the non-power stroke, and the load applied by the hydraulic system to the bearing bush is used to simulate the load on the bearing bush during the power stroke.

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