Engine torque measuring device and method

Abstract

The application relates to the technical field of aero-engines, and particularly discloses an engine torque measuring device and method, which comprises a mounting base with a mounting cavity, a torque measuring shaft, a piston assembly and a lubricating oil pressure sensor. The torque measuring shaft is rotatably arranged in the mounting cavity and can slide relative to the mounting cavity. The end of the torque measuring shaft is rotatably provided with a top disc. A transmission helical gear is arranged on the torque measuring shaft. The piston assembly comprises a shell and a piston body. The shell is fixedly connected with the inner wall of the mounting base. The piston body is slidably connected with the shell. One end of the piston body penetrates through the shell and abuts against the top disc. A first oil drain hole is arranged on the shell. A second oil drain hole is arranged on the piston body. The piston body can selectively connect or disconnect the first oil drain hole and the second oil drain hole through sliding. An oil channel is arranged in the mounting base. The oil outlet of the oil channel is connected with the second oil drain hole. The lubricating oil pressure sensor is used for detecting the lubricating oil pressure of the oil channel. The application has stable measurement and low cost.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular to an engine torque measuring device and method. Background Technology

[0002] The output shaft torque measuring device of an aero-engine is an important measuring device on the engine. On the one hand, it can monitor in real time whether the engine output torque can meet the performance requirements of the aircraft. On the other hand, it can also detect and warn of over-torque fault modes to avoid mechanical damage to the engine.

[0003] In related technologies, the commonly used torque measuring device is the electrical torque measuring device. It converts the change in phase displacement between the measuring shaft and the reference shaft into a torque value. The electrical torque measuring device requires a double-margin design and uses two sets of measurement systems, which is costly. Moreover, the electrical torque measuring device is susceptible to electromagnetic interference, which affects the accuracy and stability of the measurement. Summary of the Invention

[0004] The purpose of this invention is to provide an engine torque measuring device and method to solve the problem that in related technologies, engine output torque needs to be detected by an electronic torque measuring device, which is costly and susceptible to electromagnetic interference, affecting the accuracy and stability of the measurement.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an engine torque measuring device, the engine torque measuring device comprising:

[0007] Mounting base, having a mounting cavity;

[0008] A torsion measuring shaft, one end of which is rotatably disposed in the mounting cavity and can slide relative to the mounting cavity, a top plate is rotatably disposed at the end of the torsion measuring shaft, and a transmission helical gear is disposed on the torsion measuring shaft, the transmission helical gear being capable of driving connection with the output shaft of the engine;

[0009] A piston assembly is disposed within the mounting cavity. The piston assembly includes a housing and a piston body. The housing is fixedly connected to the inner wall of the mounting base, and the piston body is slidably connected to the housing. One end of the piston body extends through the housing and abuts against the top plate. The housing is provided with a first oil drain hole, and the piston body is provided with a second oil drain hole. The piston body can slide to selectively connect or disconnect the first oil drain hole and the second oil drain hole.

[0010] The lubricating oil pressure sensor has an oil passage provided in the mounting base. The oil passage has an oil inlet and an oil outlet. The oil outlet is connected to the second oil drain hole. The lubricating oil pressure sensor is used to detect the lubricating oil pressure in the oil passage.

[0011] In one embodiment, an opening groove is provided at one end of the piston body facing the oil inlet, and the opening groove is connected to the inner cavity of the housing and the oil inlet;

[0012] The number of the second oil drain holes is multiple, and the multiple second oil drain holes are arranged along the circumference of the piston body and are all connected to the opening groove.

[0013] In one embodiment, a first bearing is provided between the torsion measuring shaft and the mounting base. The first bearing includes an outer ring, a roller, and an inner ring. The roller is rotatable between the outer ring and the inner ring. The outer ring is fixedly connected to the mounting base, and the inner ring is fixedly connected to the torsion measuring shaft. The outer ring can rotate and slide relative to the inner ring.

[0014] In one embodiment, a limiting portion is provided on the outer ring, the limiting portion extending radially along the torsion measuring shaft, and the sidewall of the limiting portion abutting against the mounting base; and / or,

[0015] The torque measuring shaft is provided with a flange, which is located on the side of the transmission helical gear near the piston assembly, and the transmission helical gear can abut against the flange.

[0016] In one embodiment, the mounting base includes a detachably connected cylinder and a cover. One end of the torsion measuring shaft is rotatably disposed in the cylinder and can slide relative to the cylinder along its own axial direction. The cover is provided with a mounting hole, which is connected to the oil circuit. The lubricating oil pressure sensor is connected to the mounting hole.

[0017] In one embodiment, a sleeve is provided at the end of the torsion measuring shaft, the sleeve is rotatably connected to the torsion measuring shaft through a second bearing, and the top plate is fixedly connected to the sleeve.

[0018] In one embodiment, the top plate is a hemispherical disc structure, with the convex top of the hemispherical disc facing the piston body and able to abut against the piston body.

[0019] In one embodiment, a mounting groove is formed on the wall of the mounting cavity, a connecting plate is provided around the periphery of the housing, the housing is partially connected to the mounting groove, and the side wall of the connecting plate is fixedly connected to the wall of the mounting cavity.

[0020] In one embodiment, a plurality of seals are provided between the piston body and the housing, and the plurality of seals are arranged at intervals along the axial direction of the piston body.

[0021] Secondly, the present invention provides an engine torque measurement method, based on the engine torque measurement device in any of the above-mentioned solutions, the engine torque measurement method comprising:

[0022] Obtain the lubricating oil pressure corresponding to different engine output torques;

[0023] The output shaft of the engine is connected to the transmission helical gear of the torque measuring shaft;

[0024] Based on the output torque of the engine's output shaft, the transmission helical gear drives the torque measuring shaft to move axially. The torque measuring shaft drives the piston body to move closer to the housing. The first oil drain hole and the second oil drain hole are disconnected. The lubricating oil pressure in the oil circuit increases. The lubricating oil pushes the piston body away from the housing to slide. The first oil drain hole and the second oil drain hole are connected to drain oil. The force exerted by the lubricating oil on the piston body and the force exerted by the torque measuring shaft on the piston body reach dynamic equilibrium.

[0025] The lubricating oil pressure in the oil circuit is detected, and the output torque of the engine is determined based on the lubricating oil pressure.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention provides an engine torque measurement device and method. By correlating the torque change on the engine output shaft with the lubricating oil pressure change, the torque and lubricating oil pressure are calibrated. During engine operation, when the output torque of the engine output shaft increases, the axial load on the piston assembly side of the transmission helical gear increases. The transmission helical gear drives the torque measuring shaft and the top plate to slide axially toward the piston assembly. The top plate drives the piston body to slide relative to the housing, so that the first and second oil drain holes are disconnected. At this time, the lubricating oil pressure in the oil circuit of the mounting base increases. The increased lubricating oil pressure pushes the piston body to slide axially until the second oil drain hole on the piston body reconnects with the first oil drain hole on the housing. The piston body and the top plate reach a dynamic equilibrium position. The lubricating oil pressure sensor detects the increased lubricating oil pressure. The output torque value corresponding to the bench calibration can be obtained from the increased lubricating oil pressure. Thus, the engine output torque can be measured based on the change of lubricating oil pressure in the oil circuit. This method is not only simple in structure and easy to use, but also low in cost, and reduces the impact of electromagnetic interference on the measurement accuracy and stability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the engine torque measuring device in an embodiment of the present invention;

[0029] Figure 2 This is a partial enlarged view of the engine torque measuring device in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Mounting base; 11. Mounting cavity; 12. Oil passage; 13. Cylinder body; 14. Cover body; 141. Mounting hole; 15. Mounting groove;

[0032] 20. Torque measuring shaft; 201. Flange; 21. Top plate; 22. Transmission helical gear; 24. First bearing; 241. Outer ring; 242. Roller; 243. Inner ring; 244. Limiting part; 25. Sleeve; 26. Second bearing;

[0033] 3. Piston assembly; 31. Housing; 311. First drain hole; 312. Connecting plate; 32. Piston body; 321. Second drain hole; 322. Opening groove;

[0034] 4. Lubricating oil pressure sensor;

[0035] 5. Output shaft. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0040] like Figures 1 to 2 As shown in the figure, the X direction is a schematic diagram of the axial sliding direction of the torque measuring shaft when the engine output torque increases. An embodiment of the first aspect of the present invention provides an engine torque measuring device, which includes a mounting base 1, a torque measuring shaft 20, a piston assembly 3, and a lubricating oil pressure sensor 4. The mounting base 1 has a mounting cavity 11. The torque measuring shaft 20 is rotatably disposed within the mounting cavity 11 and can slide relative to the mounting cavity 11. A transmission helical gear 22 is disposed on the torque measuring shaft 20. The transmission helical gear 22 can be transmitted to the engine output shaft 5. Rotation of the engine output shaft 5 can drive the torque measuring shaft 20 to rotate via the transmission helical gear 22. Due to the helical tooth structure of the transmission helical gear 22, when the output torque of the engine output shaft 5 increases, the axial load on the transmission helical gear 22 increases, and the transmission helical gear 22 can push the torque measuring shaft 20 to move axially. A top plate 21 is rotatably disposed at the end of the torque measuring shaft 20, and the top plate 21 is disposed within the mounting cavity 11 and rotatably disposed at the end of the torque measuring shaft 20.

[0041] Piston assembly 3 is disposed within mounting cavity 11. Piston assembly 3 includes housing 31 and piston body 32. Housing 31 is fixedly connected to the inner wall of mounting base 1, and housing 31 can be supported by mounting base 1. Piston body 32 is slidably connected to housing 31, and one end of piston body 32 protrudes from housing 31 and abuts against top plate 21. Housing 31 is provided with a first oil drain hole 311, and piston body 32 is provided with a second oil drain hole 321. Sliding piston body 32 can selectively connect or disconnect the first oil drain hole 311 and the second oil drain hole 321. That is, when piston body 32 slides to the position where the first oil drain hole 311 and the second oil drain hole 321 are aligned, the first oil drain hole 311 and the second oil drain hole 321 are connected, allowing lubricating oil in oil passage 12 to drain. When the piston body 32 slides to a position where the first drain hole 311 and the second drain hole 321 are misaligned, the first drain hole 311 and the second drain hole 321 are disconnected and no longer conductive, and the inner wall of the housing 31 can block the second drain hole 321. The oil passage 12 is provided in the mounting base 1, and the oil passage 12 has an oil inlet and an oil outlet. The oil outlet is connected to the second drain hole 321. The lubricating oil pressure sensor 4 is used to detect the oil pressure of the oil passage 12.

[0042] With this setup, the engine torque measuring device can be placed at the output shaft 5 of the engine. The output shaft 5 of the engine is connected to the transmission helical gear 22. During engine bench testing, the output shaft 5 of the engine outputs different torques in sequence. The lubricating oil pressure sensor 4 can detect the corresponding lubricating oil pressure value under different torques, so as to correlate the torque change on the engine output shaft 5 with the lubricating oil pressure change and complete the calibration of torque and lubricating oil pressure.

[0043] During engine operation, when the output torque of the engine output shaft 5 increases, the axial load on the transmission helical gear 22 toward the piston assembly 3 increases. The transmission helical gear 22 can drive the torque measuring shaft 20 and the top plate 21 to slide axially toward the piston assembly 3. The top plate 21 drives the piston body 32 to slide relative to the housing 31, so that the first oil drain hole 311 and the second oil drain hole 321 are disconnected and not connected.

[0044] At this time, the lubricating oil pressure in the oil circuit 12 of the mounting base 1 increases. After the lubricating oil pressure increases, it will push the piston body 32 to slide axially until the second oil drain hole 321 on the piston body 32 is connected to the first oil drain hole 311 on the housing 31 again. The piston body 32 and the top plate 21 reach a dynamic equilibrium position. The lubricating oil pressure sensor 4 detects the current increased lubricating oil pressure. The output torque value corresponding to the bench calibration can be obtained by the increased lubricating oil pressure. Thus, the engine output torque can be measured according to the change of lubricating oil pressure in the oil circuit 12. It is not only simple in structure and easy to use, but also low in cost. It also reduces the impact of electromagnetic interference on the measurement accuracy and stability. It solves the problem that the engine output torque needs to be detected by an electric torque measuring device, which is costly and easily affected by electromagnetic interference, thus affecting the accuracy and stability of the measurement.

[0045] like Figures 1 to 2 As shown, in some embodiments, an opening groove 322 is provided at one end of the piston body 32 facing the oil inlet, and the opening groove 322 is connected to the inner cavity of the housing 31 and the oil inlet. There are multiple second oil drain holes 321, which are arranged circumferentially along the piston body 32 and are all connected to the opening groove 322. This arrangement allows the groove cavity of the opening groove 322 and the inner cavity enclosed by the piston body 32 and the housing 31 to store lubricating oil, increasing the flow space of the lubricating oil. Furthermore, having multiple second oil drain holes 321 not only facilitates alignment and communication between the second oil drain holes 321 and the first oil drain hole 311, but also increases the oil drainage area.

[0046] In this embodiment, multiple first oil drain holes 311 may be provided on the housing 31 to facilitate oil drainage through communication with the second oil drain hole 321. A guide member may be provided between the housing 31 and the piston body 32. The guide member extends axially along the piston body 32 to allow the piston body 32 to slide axially relative to the housing 31, reducing the relative rotation between the piston body 32 and the housing 31 and facilitating the alignment of the first oil drain hole 311 and the second oil drain hole 321. The guide member may be, but is not limited to, a guide rail or a guide groove, as long as it can guide the movement of the piston body 32 and the housing 31.

[0047] like Figures 1 to 2 As shown, in some embodiments, a first bearing 24 is provided between the torsion measuring shaft 20 and the mounting base 1. The first bearing 24 includes an outer ring 241, a roller 242, and an inner ring 243. The roller 242 can rotate between the outer ring 241 and the inner ring 243. The outer ring 241 is fixedly connected to the mounting base 1, and the inner ring 243 is fixedly connected to the torsion measuring shaft 20. The outer ring 241 can rotate and slide relative to the inner ring 243. That is, the first bearing 24 can rotate circumferentially with the inner ring 243 through the rotation of the roller 242. Moreover, the inner ring 243 and the outer ring 241 of the first bearing 24 have axial freedom and can move axially a certain distance. The circumferential movement distance of the inner ring 243 and the outer ring 241 is sufficient to meet the disconnection requirements of the first oil drain hole 311 and the second oil drain hole 321.

[0048] The roller 242 can be disposed on the outer ring 241 or the inner ring 243. The roller 242 can be, but is not limited to, a long strip-shaped roller, which can provide axial space for the relative movement of the inner ring 243 and the outer ring 241.

[0049] In some other embodiments, a support frame can be provided between the torsion measuring shaft 20 and the mounting base 1. The support frame can be a cylindrical structure and can be sleeved on the outside of the first bearing 24. The first bearing 24 can be a common bearing structure such as a ball bearing. The support frame and the torsion measuring shaft 20 are rotatably connected through the first bearing 24, so that the torsion measuring shaft 20 can rotate flexibly relative to the support frame and the mounting base 1. The support frame is slidably connected to the mounting cavity 11, so that when the transmission helical gear 22 applies axial force to the torsion measuring shaft 20, the torsion measuring shaft 20 and the support frame assembly can slide relative to the mounting base 1, thereby causing the top plate 21 at the end of the torsion measuring shaft 20 to press the piston body 32 to slide, so that the first oil drain hole 311 and the second oil drain hole 321 can be disconnected. A linear bearing can be provided between the support frame and the mounting cavity 11, which can make the sliding of the support frame relative to the mounting base 1 more flexible and smooth. In this embodiment, the installation of the support frame allows the torsion measuring shaft 20 to have a large axial sliding space relative to the mounting base 1.

[0050] In this embodiment, a guide structure, such as a guide rail or guide groove, can be provided between the support frame and the mounting base 1. The guide structure can extend along the axial direction of the torsion measuring shaft 20 so that the support frame can slide smoothly along the axial direction of the torsion measuring shaft 20, thereby reducing the circumferential rotation of the support frame relative to the mounting base 1.

[0051] In some embodiments, a limiting portion 244 is provided on the outer ring 241. The limiting portion 244 extends radially along the torsion measuring shaft 20. The sidewall of the limiting portion 244 can abut against the mounting base 1. That is, the limiting portion 244 can protrude radially from the surface of the torsion measuring shaft 20. When the torsion measuring shaft 20 drives the mounting base 1 to slide toward the mounting cavity 11, pushing the top plate 21 to slide and disconnect the second oil drain hole 321 on the piston body 32 from the first oil drain hole 311 on the housing 31, the sidewall of the limiting portion 244 can abut against the inner wall or the sidewall of the groove of the mounting base 1, thereby limiting the sliding position of the torsion measuring shaft 20 and preventing the torsion measuring shaft 20 from sliding out of position and damaging the piston assembly 3.

[0052] In this embodiment, the limiting part 244 may be, but is not limited to, multiple point segment protrusions or annular protrusions. The limiting part 244 can be arranged along the circumference of the mounting base 1 to limit the sliding limit position of the outer ring 241.

[0053] In some embodiments, a flange 201 is provided on the torsion measuring shaft 20. The flange 201 is located on the side of the transmission helical gear 22 near the piston assembly 3. The transmission helical gear 22 can abut against the flange 201. That is, when the axial load of the transmission helical gear 22 increases, the transmission helical gear 22 can drive the torsion measuring shaft 20 to slide axially through the connection position between its own central hole and the surface of the torsion measuring shaft 20 and the abutment position between the side wall of the transmission helical gear 22 and the flange 201. The flange 201 can withstand a large axial load and prevent the transmission helical gear 22 and the torsion measuring shaft 20 from sliding axially relative to each other.

[0054] like Figures 1 to 2 As shown, in some embodiments, the mounting base 1 includes a detachably connected cylinder 13 and a cover 14. The end of the torsion measuring shaft 20 is rotatably disposed within the cylinder 13 and can slide relative to the cylinder 13 along its own axial direction. The cylinder 13 can provide sufficient space for the installation and sliding of the torsion measuring shaft 20. The cover 14 is provided with a mounting hole 141, which is connected to the oil passage 12. The lubricating oil pressure sensor 4 is connected to the mounting hole 141, that is, the lubricating oil pressure sensor 4 can be mounted on the cover 14 through the mounting hole 141, and the detection end of the lubricating oil pressure sensor 4 is connected to the oil passage 12 through the mounting hole 141, so that the lubricating oil pressure sensor 4 can not only be stably connected to the cover 14, but also accurately detect the lubricating oil pressure in the oil passage 12.

[0055] In this embodiment, the connection method between the cylinder 13 and the cover 14 can be, but is not limited to, bolt connection, snap-fit, adhesive connection, or magnetic connection. A sealing structure can also be provided at the connection point between the cylinder 13 and the cover 14. The sealing structure can be, but is not limited to, a sealing ring, to ensure a tight connection between the cylinder 13 and the cover 14 and improve the sealing performance. The torsion measuring shaft 20 can be entirely housed within the cylinder 13, or the cylinder 13 can be a segmented structure, with one segment located at one end of the torsion measuring shaft 20 and another segment at the other end, sufficient to support both ends of the torsion measuring shaft 20. A first bearing 24 can be provided at both ends of the torsion measuring shaft 20, and the two first bearings 24 can provide rotational and sliding support for both ends of the torsion measuring shaft 20.

[0056] like Figures 1 to 2 As shown, in some embodiments, a sleeve 25 is provided at the end of the torsion measuring shaft 20, and the top plate 21 is fixedly connected to the sleeve 25. The top plate 21 can be supported by the sleeve 25. The sleeve 25 is rotatably connected to the torsion measuring shaft 20 through the second bearing 26. The sleeve 25 can rotate flexibly relative to the torsion measuring shaft 20. When the torsion measuring shaft 20 rotates, the top plate 21 can remain in contact with the piston body 32, reducing the rotational torque of the top plate 21 with the torsion measuring shaft 20, thereby reducing the relative rotation between the top plate 21 and the piston body 32.

[0057] In some embodiments, the top plate 21 is a hemispherical disc structure, with the convex top of the hemispherical disc facing the piston body 32 and able to abut against the piston body 32, so as to reduce the contact area between the top plate 21 and the piston body 32, reduce the friction between the two, reduce the rotation of the piston body 32, and facilitate the connection between the first oil drain hole 311 and the second oil drain hole 321.

[0058] In this embodiment, the convex top of the top plate 21 can be a flat surface to improve the stability of the top plate 21 in contact with the piston and reduce relative wobbling. Of course, for ease of processing, the top plate 21 can also be designed as a multi-faceted pyramidal disc structure, with the convex top of the top plate 21 facing the piston body 32 and able to abut against the piston body 32. The structure of the top plate 21 can be set according to the usage requirements, as long as it can meet the pushing operation requirements of the piston body 32.

[0059] like Figures 1 to 2As shown, in some embodiments, a mounting groove 15 is provided on the wall of the mounting cavity 11, and a connecting plate 312 is provided circumferentially on the housing 31. The housing 31 is partially connected to the mounting groove 15, and the side wall of the connecting plate 312 is fixedly connected to the wall of the mounting cavity 11. The connection can be, but is not limited to, bolt connection or snap-fit. The housing 31 extends into and is connected to the mounting groove 15. The mounting groove 15 can radially limit the housing 31, and the connection between the two is stable. Moreover, the connecting plate 312 protrudes outward in the circumferential direction of the housing 31. The housing 31 is connected to the mounting base 1 through the connecting plate 312, which can limit the axial sliding of the housing 31 and the mounting base 1, reduce the shaking and displacement of the housing 31, and improve the accuracy of the push position of the top plate 21 on the piston body 32.

[0060] In some embodiments, a plurality of seals are provided between the piston body 32 and the housing 31. The plurality of seals are arranged at intervals along the axial direction of the piston body 32 to provide sliding seal between the piston body 32 and the housing 31, thereby reducing the leakage of lubricating oil pressure when the piston body 32 slides relative to the housing 31 and maintaining the stability of lubricating oil pressure in the oil circuit 12.

[0061] In this embodiment, the seal can be made of elastic materials such as rubber or silicone, so that the seal fits better with the piston body 32 or the housing 31, reducing the gap and providing good sealing performance.

[0062] like Figures 1 to 2 As shown, an embodiment of the second aspect of the present invention provides an engine torque measurement method. Based on the above-described engine torque measurement device, the engine torque measurement method specifically includes the following steps:

[0063] S100: Obtain the lubricating oil pressure corresponding to different engine output torques;

[0064] S200, Connect the engine output shaft 5 to the transmission helical gear 22 of the torque measuring shaft 20;

[0065] S300. According to the output torque of the engine output shaft 5, the transmission helical gear 22 pushes the torque measuring shaft 20 to slide axially. The torque measuring shaft 20 pushes the piston body 32 to slide close to the housing 31. The first oil drain hole 311 and the second oil drain hole 321 are disconnected. The lubricating oil pressure in the oil circuit 12 increases. The lubricating oil pushes the piston body 32 away from the housing 31 to slide. The first oil drain hole 311 and the second oil drain hole 321 are connected to drain oil. The force exerted by the lubricating oil on the piston body 32 and the force exerted by the torque measuring shaft 20 on the piston body 32 reach dynamic equilibrium.

[0066] S400: Detect the lubricating oil pressure in oil circuit 12 and determine the engine output torque based on the lubricating oil pressure.

[0067] With this setup, during engine bench testing, the engine output shaft 5 outputs different torques sequentially. The lubricating oil pressure sensor 4 can detect the corresponding lubricating oil pressure under different torques, thereby correlating the torque changes on the engine output shaft 5 with the lubricating oil pressure changes and completing the calibration of torque and lubricating oil pressure.

[0068] During engine operation, when the output torque of the engine output shaft 5 increases, the axial load on the transmission helical gear 22 toward the piston assembly 3 increases. The transmission helical gear 22 can drive the torque measuring shaft 20 and the top plate 21 to slide axially toward the piston assembly 3. The top plate 21 drives the piston body 32 to slide relative to the housing 31, so that the first oil drain hole 311 and the second oil drain hole 321 are disconnected and not connected.

[0069] At this time, the lubricating oil pressure in the oil circuit 12 of the mounting base 1 increases. After the lubricating oil pressure increases, it will push the piston body 32 to slide axially until the second oil drain hole 321 on the piston body 32 is connected to the first oil drain hole 311 on the housing 31 again. The force exerted by the lubricating oil on the piston body 32 is equal to the force exerted by the torque measuring shaft 20 on the piston body 32 so that the piston body 32 and the top plate 21 reach a dynamic equilibrium position. The lubricating oil pressure sensor 4 detects the current increased lubricating oil pressure. The output torque value corresponding to the bench calibration can be obtained by the increased lubricating oil pressure value. Thus, the output torque of the engine can be measured according to the change of lubricating oil pressure in the oil circuit 12. It is not only simple in structure and easy to use, but also uses mechanical dynamic pressure detection, which reduces the impact of electromagnetic interference on the measurement accuracy and stability.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An engine torque measuring device, characterized in that, include: Mounting base (1) has mounting cavity (11); Torque measuring shaft (20), the torsion measuring shaft (20) is rotatably disposed in the mounting cavity (11), and the torsion measuring shaft (20) can slide relative to the mounting cavity (11). The end of the torsion measuring shaft (20) is rotatably provided with a top plate (21). The torsion measuring shaft (20) is provided with a transmission helical gear (22), and the transmission helical gear (22) can be connected to the output shaft (5) of the engine. A piston assembly (3) is disposed in the mounting cavity (11). The piston assembly (3) includes a housing (31) and a piston body (32). The housing (31) is fixedly connected to the inner wall of the mounting base (1). The piston body (32) is slidably connected to the housing (31), and one end of the piston body (32) protrudes from the housing (31) and abuts against the top plate (21). A first oil drain hole (311) is provided on the housing (31), and a second oil drain hole (321) is provided on the piston body (32). The piston body (32) can slide to selectively connect or disconnect the first oil drain hole (311) and the second oil drain hole (321). The lubricating oil pressure sensor (4) is provided in the mounting base (1) with an oil passage (12). The oil passage (12) has an oil inlet and an oil outlet. The oil outlet is connected to the second drain hole (321). The lubricating oil pressure sensor (4) is used to detect the lubricating oil pressure of the oil passage (12).

2. The engine torque measuring device according to claim 1, characterized in that, The piston body (32) has an opening groove (322) at one end facing the oil inlet, and the opening groove (322) is connected to the inner cavity of the housing (31) and the oil inlet. The number of the second oil drain holes (321) is multiple, and the multiple second oil drain holes (321) are arranged along the circumference of the piston body (32) and the multiple second oil drain holes (321) are all connected to the opening groove (322).

3. The engine torque measuring device according to claim 1, characterized in that, A first bearing (24) is provided between the torsion measuring shaft (20) and the mounting base (1). The first bearing (24) includes an outer ring (241), a roller (242) and an inner ring (243). The roller (242) is rotatable between the outer ring (241) and the inner ring (243). The outer ring (241) is fixedly connected to the mounting base (1), and the inner ring (243) is fixedly connected to the torsion measuring shaft (20). The outer ring (241) can rotate and slide relative to the inner ring (243).

4. The engine torque measuring device according to claim 3, characterized in that, A limiting portion (244) is provided on the outer ring (241), the limiting portion (244) extending radially along the torsion measuring shaft (20), and the sidewall of the limiting portion (244) abutting against the mounting base (1); and / or, The torque measuring shaft (20) is provided with a flange (201), which is located on the side of the transmission helical gear (22) near the piston assembly (3), and the transmission helical gear (22) can abut against the flange (201).

5. The engine torque measuring device according to claim 1, characterized in that, The mounting base (1) includes a detachably connected cylinder (13) and a cover (14). One end of the torsion measuring shaft (20) is rotatably disposed inside the cylinder (13) and can slide relative to the cylinder (13) along its own axial direction. The cover (14) is provided with a mounting hole (141), which is connected to the oil passage (12). The lubricating oil pressure sensor (4) is connected to the mounting hole (141).

6. The engine torque measuring device according to claim 1, characterized in that, The end of the torsion measuring shaft (20) is provided with a sleeve (25), the sleeve (25) is rotatably connected to the torsion measuring shaft (20) through a second bearing (26), and the top plate (21) is fixedly connected to the sleeve (25).

7. The engine torque measuring device according to claim 1, characterized in that, The top plate (21) is a hemispherical plate structure, and the convex top of the hemispherical plate faces the piston body (32) and can abut against the piston body (32).

8. The engine torque measuring device according to claim 1, characterized in that, The mounting cavity (11) has a mounting groove (15) on its wall surface. The housing (31) is provided with a connecting plate (312) in its circumferential direction. The housing (31) is partially connected to the mounting groove (15). The side wall of the connecting plate (312) is fixedly connected to the wall surface of the mounting cavity (11).

9. The engine torque measuring device according to claim 1, characterized in that, A plurality of seals are provided between the piston body (32) and the housing (31), and the plurality of seals are arranged at intervals along the axial direction of the piston body (32).

10. A method for measuring engine torque, characterized in that, Based on the engine torque measuring device according to any one of claims 1-9, the engine torque measuring method includes: Obtain the lubricating oil pressure corresponding to different engine output torques; The output shaft of the engine is connected to the transmission helical gear of the torque measuring shaft; According to the output torque of the engine's output shaft, the transmission helical gear drives the torque measuring shaft to move axially, and the torque measuring shaft drives the piston body to move closer to the housing. The first oil drain hole and the second oil drain hole are disconnected, the lubricating oil pressure in the oil circuit increases, and the lubricating oil pushes the piston body away from the housing to slide. The first oil drain hole and the second oil drain hole are connected to drain oil, and the force exerted by the lubricating oil on the piston body and the force exerted by the torque measuring shaft on the piston body reach dynamic equilibrium. The lubricating oil pressure in the oil circuit is detected, and the output torque of the engine is determined based on the lubricating oil pressure.

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