Decoupling type mechanical sealing force flow gear experiment table

Abstract

The utility model provides a decoupling type mechanical closed force flow gear experiment table, which comprises a driving device, an accompanying test gear box, an experiment gear box, a first transmission shaft, a second transmission shaft, a hydraulic expansion sleeve, a torque loading device and a wireless acquisition device, wherein the accompanying test gear box and the experiment gear box are oppositely arranged; the input ends and the output ends of the test gear box, the accompanying test gear box, the transmission shaft and other parts are correspondingly connected to form a closed system. One side of the accompanying gearbox is connected in series with a loading flange, so that the first transmission shaft and the second transmission shaft in the closed system are subjected to torsional elastic deformation, a tooth surface load is added to a gear in the experimental gearbox, and an energy consumption device does not need to be additionally configured to provide a load; the loading flange is disconnected with the hydraulic expansion sleeve, then the loading lever and the weight disc are used for loading to generate torque, and after the torque is generated, the shaft system is connected into a whole through the hydraulic expansion sleeve, so that after the loading lever and the weight disc are removed, the elastic deformation of the second transmission shaft always exists, and the closed torque also exists.

Description

Technical Field

[0001] This utility model belongs to the field of gear experiments, specifically relating to a decoupled mechanical closed force flow gear experimental platform. Background Technology

[0002] Gear test benches are devices used for gear transmission experiments, including those testing transmission efficiency, vibration, lifespan, and torsional strength. Based on different power transmission principles and loading methods, gearbox test benches can be broadly classified into open-flow and closed-flow types. Mechanically closed-flow gear test benches are currently the most widely used equipment for gear experiments. Most existing test benches use loading arms and weights to apply torque to the closed system, maintaining the required load on the experimental gears.

[0003] CN201720079174.0 discloses a dynamic performance test bench for a closed-loop power flow RV reducer. The RV reducer under test and the auxiliary test RV reducer are the same RV reducer, connected in series in a back-to-back configuration within the drive shaft. A weight pan loading method is used, with the weight torque loading device suspended at one end of the transmission gearbox and manually applied. This patent requires the weight pan to remain continuously mounted on the floating support gearbox during the experiment. By changing the rotation direction of the rear gear, an interaction force is generated, thus producing torque. If the weight pan falls or is removed, the rear gear will not rotate in the reverse direction, and the closed-loop torque will disappear. Utility Model Content

[0004] The present invention aims to solve the technical problems existing in the prior art. The purpose of the present invention is to provide a decoupled mechanical closed force flow gear experimental platform.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a decoupled mechanical closed-loop force flow gear test bench, comprising a drive device, a test gearbox and an experimental gearbox arranged opposite to each other, a first transmission shaft and a second transmission shaft arranged in parallel, a torque loading device for applying torque, and a wireless acquisition device for collecting experimental data. The drive device is connected to the first input end of the test gearbox and drives it to operate. The test gearbox transmits power to the experimental gearbox through the first transmission shaft, and the experimental gearbox transmits power back to the test gearbox through the second transmission shaft, forming a closed-loop force flow. The torque loading device includes a loading flange coaxially fixed to the end of the second transmission shaft away from the experimental gearbox, a loading lever detachably connected to the loading flange, and a weight pan that can be suspended at the end of the loading lever. The end of the loading flange away from the second transmission shaft is detachably connected to the test gearbox through a connecting device. When the loading flange is connected to the connecting device, the shaft system of the second transmission shaft is connected as one unit, and the connecting device can rotate with the loading flange. When the loading flange is disconnected from the connecting device, the loading flange and the connecting device do not contact each other and can rotate relative to each other.

[0006] The above technical solution involves a loading flange connected in series on one side of the test gearbox of the experimental platform. This causes torsional elastic deformation of the first and second drive shafts within the closed system, thereby adding tooth surface load to the gears in the experimental gearbox without requiring additional energy-consuming devices to provide the load. Furthermore, the loading flange generates torque by disconnecting from the hydraulic expansion sleeve and then applying load through the loading lever and weight pan. After generating torque, the loading flange is then connected to the hydraulic expansion sleeve as a whole. Thus, even after removing the loading lever and weight pan, the elastic deformation of the second drive shaft and the closed torque remain. By adjusting the mass of the weights on the weight pan, the torque is changed, thereby altering the tooth surface load to simulate different experimental conditions. This experimental platform can achieve full-speed, full-load, and constant-load variable-speed experiments. Moreover, the loading method using the loading lever and weight pan is simple and controllable, allowing the weight mass to be adjusted according to experimental needs to achieve full-load condition experiments.

[0007] In a preferred embodiment of the present invention, the outer wall of the loading flange has several grooves, and the loading lever has at least two locking teeth that cooperate with the grooves and can be locked in the grooves.

[0008] The above technical solution achieves a detachable connection between the loading lever and the loading flange through the structure of grooves and teeth. The structure is simple and the loading lever is easy to install and disassemble.

[0009] In a preferred embodiment of this utility model, the connecting device is a hydraulic expansion sleeve, which locks the two contact surfaces opposite to the loading flange by friction through the squeezing of the internal hydraulic medium.

[0010] The above technical solution uses a hydraulic expansion sleeve to connect the test gearbox and the loading flange, which has the advantages of high concentricity and small radial runout, avoiding the off-center load problem that may occur when using flange connection; at the same time, the hydraulic expansion sleeve is convenient and time-saving to disassemble and assemble, and only the screws are operated radially, saving axial space.

[0011] In a preferred embodiment of this utility model, the driving device includes a drive motor with adjustable speed, and the output shaft of the drive motor is connected to the first input end of the test gearbox through a belt drive mechanism.

[0012] The above technical solution transmits the driving force of the drive motor through a belt drive mechanism, which allows the drive motor to be placed on the left or rear side of the experimental gearbox, making the installation position of the drive motor more flexible.

[0013] In another preferred embodiment of this utility model, the output end of the test gearbox is coaxially connected to the first transmission shaft, the end of the first transmission shaft away from the test gearbox is coaxially connected to the input end of the experimental gearbox, the output end of the experimental gearbox is on the same side as its input end and coaxially connected to the second transmission shaft, and the second input end of the test gearbox is on the same side as its output end and coaxially connected to the end of the second transmission shaft away from the experimental gearbox.

[0014] In another preferred embodiment of this utility model, the first drive shaft is connected to the input end of the experimental gearbox via a first flexible coupling, and the output end of the experimental gearbox is connected to the second drive shaft via a second flexible coupling. A wireless acquisition device is installed on the first and second flexible couplings.

[0015] In the above technical solution, the first flexible coupling and the second flexible coupling serve as components connecting the experimental gearbox with the first and second drive shafts to transmit power. They also integrate wireless acquisition devices to collect and transmit torque and strain data, making installation convenient. Furthermore, the flexible coupling connects the two gearboxes. Since the flexible coupling is composed of two half couplings and an intermediate diaphragm, the elastic deformation of the intermediate diaphragm can compensate for the relative displacement of the two shafts, thereby reducing torsional stiffness and achieving vibration isolation between the two shafts. Thus, axial vibration coupling is decoupled.

[0016] In another preferred embodiment of this utility model, the output end of the test gearbox is connected to the first transmission shaft via a spline sleeve.

[0017] In another preferred embodiment of this utility model, the end of the second drive shaft away from the experimental gearbox is supported by a support base.

[0018] The above technical solution supports the end of the second drive shaft with a support base. After disconnecting the connection between the loading flange and the hydraulic expansion sleeve, the second drive shaft is not a cantilever structure, which reduces its bending deformation, makes the torque loading more accurate, and facilitates the subsequent alignment and connection of the loading flange and the hydraulic expansion sleeve.

[0019] In another preferred embodiment of this utility model, the experimental gearbox, the auxiliary gearbox, and the support base are all fixedly installed on the workbench by bolts.

[0020] The above technical solution, by setting up a workbench, is more conducive to maintaining the integrity of the experimental platform and facilitates the installation of the experimental platform on the ground.

[0021] Compared with the prior art, the superior technical solution of this utility model has the following beneficial effects:

[0022] 1) The experimental platform applies a loading torque through the loading flange on one side of the test gearbox. After loading, a torque is generated, causing the second drive shaft to undergo elastic deformation. The elastic deformation keeps the torque inside the second drive shaft and transmits it to the gear shaft of the experimental gearbox through the second flexible coupling, so that the meshing gear pairs press against each other to form a tooth surface load. The torque can be changed by adjusting the mass of the weights on the weight pan, thereby changing the tooth surface load to simulate different experimental conditions. This experimental platform can realize full speed, full load experiments, and constant load variable speed experiments, which can basically meet the scientific research and teaching needs of the laboratory.

[0023] 2) The experimental platform is a mechanically closed force flow system. The input and output ends of the entire system are connected to form a closed structure. Therefore, the force is only transmitted inside the system. Apart from the energy consumption generated by internal friction, there is no other load energy consumption. The power loss is small and the overall energy consumption is small. The drive motor only needs to provide speed and a small output power, which can make the output speed more constant and the experimental data more accurate. At the same time, a small power model can be selected when selecting the drive motor to save construction costs and achieve the goal of completing high-power equipment experiments with low power consumption.

[0024] 3) This experimental platform employs a decoupled design, separating force transmission from motion control to ensure independent force flow paths, reduce mutual interference between internal system components, and improve testing accuracy and stability. Furthermore, load increases / decreases and speed adjustments are independent, with each functional module operating independently, facilitating individual testing and adjustment. In the design of the test gearbox and experimental gearbox, dynamic inertia and stiffness matching achieves decoupling of meshing excitation and separation of mode shapes, reducing vibration coupling and optimizing dynamic performance.

[0025] 4) The setup of this experimental platform is simple. The main components include a test gearbox and an experimental gearbox, two drive shafts, a loading flange, a flange coupling, a drive motor, etc., without a complex transmission mechanism.

[0026] 5) The experimental platform contains a variety of mechanical parts such as gearboxes, drive shafts, and couplings, and can collect a wide variety of physical quantities, such as vibration acceleration signals, shaft torque signals, speed signals, and tooth root strain signals, making it highly practical.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1This is a top-view schematic diagram of a decoupled mechanical enclosed force flow gear test bench according to an embodiment.

[0030] Figure 2 This is a schematic diagram of the connection between the loading lever and the loading flange in the embodiment.

[0031] The reference numerals in the accompanying drawings include: drive motor 1, experimental gearbox 2, test gearbox 3, connecting device (hydraulic expansion sleeve) 4, support base 5, second flexible coupling 6, first flexible coupling 7, spline sleeve 8, first drive shaft 9, second drive shaft 10, loading lever 11, locking tooth 11a, weight pan 12, belt drive mechanism 13, worktable 14, loading flange 15, groove 15a. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] This utility model provides a decoupled mechanically enclosed force flow gear experimental platform, such as... Figure 1As shown, in a preferred embodiment, the experimental platform includes a drive unit, a test gearbox 3 and an experimental gearbox 2 arranged opposite each other on the left and right, a first drive shaft 9 and a second drive shaft 10 arranged in parallel, a torque loading device for applying torque, and a wireless acquisition device for collecting experimental data (including torque, speed, and strain). For example, the test gearbox 3 is located on the left, the experimental gearbox 2 is located on the right, and the first drive shaft 9 and the second drive shaft 10 are located between the test gearbox 3 and the experimental gearbox 2. The drive unit is connected to the first input end of the test gearbox 3 and drives it to operate. The test gearbox 3 transmits power to the experimental gearbox 2 through the first drive shaft 9, and the experimental gearbox 2 transmits power back to the test gearbox 3 through the second drive shaft 10, forming a closed force flow.

[0036] The experimental gearbox 2 has two gear shafts coaxial with the first drive shaft 9 and the second drive shaft 10, respectively. Each gear shaft has meshing gears (these are experimental gears), forming a gear set. The auxiliary gearbox 3 has the same structure as the experimental gearbox 2, also having two gear shafts coaxial with the first drive shaft 9 and the second drive shaft 10, respectively. The auxiliary gearbox 3 and the experimental gearbox 2 use gear sets with different numbers of teeth, ensuring that the excitation generated by the two gearboxes during the experiment is distributed in different frequency ranges, avoiding mode coupling. Simultaneously, the gears in the auxiliary gearbox 3 have herringbone teeth, which have the advantages of high overlap and smooth meshing, effectively reducing the generation of irrelevant excitations.

[0037] The torque loading device includes a loading flange 15 coaxially fixed to the left end of the second drive shaft 10 away from the experimental gearbox 2, a loading lever 11 detachably connected to the loading flange 15, and a weight pan 12 suspended at the end of the loading lever 11. The left end of the loading flange 15 away from the second drive shaft 10 is detachably connected to the test gearbox 3 via a connecting device 4. The connecting device 4 is a hydraulic expansion sleeve (e.g., CN200710099766.X) in the prior art. 、 According to CN201910151872.0 or CN202320699013.7, the hydraulic expansion sleeve 4 operates from the radial screw, and by squeezing the internal hydraulic medium, it generates uniform surface pressure between the two contact end faces of the hydraulic expansion sleeve 4 and the loading flange 15, so as to lock it by friction.

[0038] When the loading flange 15 is connected to the connecting device 4, the shaft system of the second drive shaft 10 is connected as one unit, and the connecting device 4 can rotate together with the loading flange 15; when the loading flange 15 is disconnected from the connecting device 4, the loading flange 15 and the connecting device 4 do not contact each other and can rotate relative to each other.

[0039] When using this experimental platform, first disconnect the loading flange 15 from the connecting device 4, connect the loading lever 11 to the loading flange 15, and suspend the weight pan 12 at the end of the loading lever 11 (the specific method of suspending the weight pan 12 is existing technology and will not be described in detail here). The torque generated by the loading lever 11 and the weight pan 12 causes the loading flange 15 to rotate relative to the connecting device 4. When the loading flange 15 rotates, it will cause the left end of the second drive shaft 10 to rotate. Since the right end of the second drive shaft 10 and the experimental gearbox 2 are fixed, the second drive shaft 10 undergoes torsional elastic deformation to generate torque. After the torque is applied, connect the loading flange 15 to the connecting device 4 to form a whole, so that the shaft system is connected as a whole through the connecting device 4, so that the second drive shaft 10 cannot rotate in the opposite direction to return to its original position. Thus, after the loading lever 11 and the weight pan 12 are removed, the elastic deformation of the second drive shaft 10 continues to exist, and the closing torque also exists.

[0040] The experimental platform applies torque via the loading flange 15 on the left side of the second drive shaft 10. This torque causes elastic deformation of the second drive shaft 10, which retains the torque within the shaft and transmits it to the gear shaft of the experimental gearbox 2. This causes the meshing gear pairs to press against each other, creating a tooth surface load. By disconnecting the loading flange 15 from the connecting device 4 and adjusting the mass of the weights on the weight pan 12, the torque is changed, thus altering the tooth surface load to simulate different experimental conditions.

[0041] This invention relates to a mechanically enclosed force-flow experimental bench, which applies elastic deformation to the second drive shaft 10 via a loading flange 15 to achieve a specified experimental load. The input and output ends of components such as the experimental gearbox 2, the auxiliary gearbox 3, the first drive shaft 9, and the second drive shaft 10 are connected to form a closed system. A torque loading device is connected in series on one side of the auxiliary gearbox 3, causing torsional elastic deformation of the second drive shaft 10 within the closed system. Since gears mesh at both ends of the first and second drive shafts 9 and 10, the first drive shaft 9 generates a reverse torque and elastic deformation, thus compressing the gear teeth and generating a tooth surface load. This adds a tooth surface load to the gears in the experimental gearbox 2 without requiring additional energy-consuming devices to provide the load.

[0042] like Figure 1 As shown, in this invention, the first input end of the test gearbox 3 is located on its left side. The driving device includes a speed-adjustable drive motor 1 located at the rear of the test gearbox 3. The drive motor 1 is a three-phase motor, and its output shaft extends to the left. The output shaft of the drive motor 1 is connected to the first input end of the test gearbox 3 via a belt transmission mechanism 13. Thus, the power of the output shaft of the drive motor 1 is transmitted to the first input end of the test gearbox 3 through the belt transmission mechanism 13, driving the test gearbox 3 to rotate.

[0043] After the torque is applied, the load is essentially determined. During the experiment, the experimental conditions can be changed by adjusting the speed of the drive motor 1. The speed range of the drive motor 1 is 0–5000 r / min. Combined with the loading flange 15, it can achieve full-speed, full-load experiments, as well as constant-load variable-speed experiments, basically meeting all experimental conditions. This experimental platform is designed for conventional gear operation experiments. Its main purpose is to achieve different operating conditions (multiple combinations of speed and load) by adjusting the torque of the loading flange 15 (different masses of the weight pan 12) and the speed of the drive motor 1, providing more experimental data, and most of these operations are short-duration.

[0044] This invention achieves significant differences in natural frequencies across different orders by matching the inertia and stiffness of the dynamics (e.g., avoiding frequency overlap), ensuring spatial decoupling of mode shapes for different vibration modes (torsional and lateral). Simultaneously, the sum of the inertia of the test gearbox 3 and the drive motor 1 is much greater than that of the experimental gearbox 2, realizing dynamic decoupling and mode shape separation of the gear meshing excitation between the two gearboxes, significantly reducing system resonance and noise.

[0045] like Figure 1 As shown, in this invention, the output end on the right side of the test gearbox 3 is coaxially connected to the left end of the first drive shaft 9 via a spline sleeve 8. The right end of the first drive shaft 9, away from the test gearbox 3, is coaxially connected to the input end on the left side of the experimental gearbox 2 via a first flexible coupling 7. The output end of the experimental gearbox 2 is on the same side as its input end and coaxially connected to the second drive shaft 10 via a second flexible coupling 6. The second input end of the test gearbox 3 is on the same side as its output end and coaxially connected to the end of the second drive shaft 10 away from the experimental gearbox 2. Wireless data acquisition devices are installed on the first flexible coupling 7 and the second flexible coupling 6 to collect and transmit torque, speed, and strain. This is existing technology and will not be described in detail here.

[0046] like Figure 1 As shown, in another preferred embodiment, the left end of the second drive shaft 10, away from the experimental gearbox 2, is supported by a support base 5. The second drive shaft 10 is rotatably connected to the support base 5, which is located between the loading flange 15 and the second drive shaft 10. More preferably, the experimental gearbox 2, the auxiliary gearbox 3, and the support base 5 are all bolted to the workbench 14. The workbench 14 is a rectangular platform, and the drive motor 1 is located on the rear side outside the workbench 14.

[0047] like Figure 2As shown, in another preferred embodiment, the outer wall of the loading flange 15 has a plurality of grooves 15a, which can be rectangular grooves. The loading lever 11 has at least two locking teeth 11a that cooperate with the grooves 15a and can be locked in the grooves 15a. The locking teeth 11a are locked into the corresponding grooves 15a at the top of the loading flange 15 and fixed in place. The weight pan 12 is suspended from the end of the loading lever 11 to apply torque.

[0048] In the description of this specification, the references to terms such as "preferred embodiment," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A decoupled mechanical closed-loop force flow gear test bench, comprising a drive unit, a test gearbox and an experimental gearbox arranged opposite to each other, a first transmission shaft and a second transmission shaft arranged in parallel, a torque loading device for applying torque, and a wireless acquisition device for collecting experimental data. The drive unit is connected to and drives the test gearbox to operate. The test gearbox transmits power to the experimental gearbox through the first transmission shaft, and the experimental gearbox transmits power back to the test gearbox through the second transmission shaft, forming a closed-loop force flow. ； The torque loading device includes a loading flange coaxially fixed to the end of the second drive shaft away from the test gearbox, a loading lever detachably connected to the loading flange, and a weight pan that can be suspended at the end of the loading lever. The end of the loading flange away from the second drive shaft is detachably connected to the test gearbox through a connecting device. When the loading flange is connected to the connecting device, the shaft system containing the second drive shaft is connected as one unit, and the connecting device can rotate together with the loading flange. When the loading flange is disconnected from the connecting device, the loading flange and the connecting device do not contact each other and can rotate relative to each other.

2. The decoupled mechanically enclosed force flow gear test bench according to claim 1, characterized in that, The outer wall of the loading flange has several grooves, and the loading lever has at least two locking teeth that cooperate with the grooves and can be locked in the grooves.

3. The decoupled mechanically enclosed force flow gear test bench according to claim 1, characterized in that, The connecting device is a hydraulic expansion sleeve, which tightens the two contact surfaces opposite the loading flange by squeezing the internal hydraulic medium.

4. A decoupled mechanically enclosed force flow gear test bench according to any one of claims 1-3, characterized in that, The drive device includes a speed-adjustable drive motor, and the output shaft of the drive motor is connected to the first input end of the test gearbox via a belt drive mechanism.

5. A decoupled mechanically enclosed force flow gear test bench according to any one of claims 1-3, characterized in that, The output end of the test gearbox is coaxially connected to the first drive shaft. The end of the first drive shaft away from the test gearbox is coaxially connected to the input end of the experimental gearbox. The output end of the experimental gearbox is on the same side as its input end and coaxially connected to the second drive shaft. The second input end of the test gearbox is on the same side as its output end and coaxially connected to the end of the second drive shaft away from the experimental gearbox.

6. The decoupled mechanically enclosed force flow gear test bench according to claim 5, characterized in that, The first drive shaft is connected to the input end of the experimental gearbox via a first flexible coupling, and the output end of the experimental gearbox is connected to the second drive shaft via a second flexible coupling. The wireless acquisition device is installed on the first and second flexible couplings.

7. The decoupled mechanically enclosed force flow gear test bench according to claim 5, characterized in that, The output end of the test gearbox is connected to the first drive shaft via a splined sleeve.

8. The decoupled mechanically enclosed force flow gear test bench according to claim 5, characterized in that, The end of the second drive shaft away from the experimental gearbox is supported by a support base.

9. A decoupled mechanically enclosed force flow gear test bench according to claim 8, characterized in that, The experimental gearbox, the auxiliary gearbox, and the support base are all fixedly installed on the workbench with bolts.

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