Engine torque measuring device and method

Abstract

The invention relates to the technical field of aero-engines, and particularly discloses an engine torque measuring device and method.The engine torque measuring device 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, and the piston assembly is arranged in the mounting cavity; 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 in sliding connection with the shell, one end of the piston body penetrates out of the shell to abut against the top disc, a first oil drainage hole is formed in the shell, and a second oil drainage hole is formed in the shell. A second oil drainage hole is formed in the piston body, and the piston body slides to enable the first oil drainage hole and the second oil drainage hole to be selectively connected or disconnected. An oil way is arranged in the installation base, an oil outlet of the oil way is communicated with the second oil drainage hole, the lubricating oil pressure sensor is used for detecting the lubricating oil pressure of the oil way, measurement is stable, and cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation engines, and in particular to an engine torque measurement device and method. Background Art

[0002] The output shaft torque measuring device of an aircraft 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 aircraft's performance requirements for the engine. On the other hand, it can also detect and warn of over-torque failure modes to avoid mechanical damage to the engine.

[0003] In the related art, the commonly used torque measurement device is an electrical torque measurement device. This device converts the phase displacement between the torque measurement axis and the reference axis into a torque value. However, this device requires a dual-margin design and uses two measurement systems, which is costly. Furthermore, this device is susceptible to electromagnetic interference, which affects the accuracy and stability of the measurement. Summary of the Invention

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

[0005] To achieve this object, the present invention adopts the following technical solutions:

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

[0007] A mounting seat having a mounting cavity;

[0008] a torsion measuring shaft, one end of which is rotatably disposed in the mounting cavity and capable of sliding relative to the mounting cavity, a top plate being rotatably disposed on the end of the torsion measuring shaft, a transmission helical gear being disposed on the torsion measuring shaft, and the transmission helical gear being capable of drivingly connecting to the output shaft of the engine;

[0009] A piston assembly is disposed in the mounting cavity, comprising a housing and a piston body, wherein the housing is fixedly connected to the inner wall of the mounting seat, the piston body is slidably connected to the housing, and one end of the piston body extends through the housing and abuts against the top plate; a first oil drain hole is provided on the housing, and a second oil drain hole is provided on the piston body, and the sliding of the piston body can selectively connect or disconnect the first and second oil drain holes;

[0010] The lubricating oil pressure sensor is provided with an oil circuit in the mounting seat, the oil circuit has an oil inlet and an oil outlet, the oil outlet is connected to the second oil drain hole, and the lubricating oil pressure sensor is used to detect the lubricating oil pressure of the oil circuit.

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

[0012] There are multiple second oil drain holes, and the multiple second oil drain holes are arranged along the circumference of the piston body and all of the multiple second oil drain holes are connected to the open groove.

[0013] In one embodiment, a first bearing is provided between the torsion measuring shaft and the mounting seat. The first bearing includes an outer ring, a roller and an inner ring. The roller can rotate between the outer ring and the inner ring. The outer ring is fixedly connected to the mounting seat. 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 is extended along the radial direction of the torsion measuring shaft, and a side wall of the limiting portion can abut against the mounting seat; and / or,

[0015] The torsion measuring shaft is provided with a flange, and the flange is provided on a side of the transmission helical gear close to the piston assembly, and the transmission helical gear can abut against the flange.

[0016] In one embodiment, the mounting seat 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 axis, a mounting hole is provided on the cover, the mounting hole is connected to the oil circuit, and 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 via a second bearing, and the top plate is fixedly connected to the sleeve.

[0018] In one embodiment, the top plate is a hemispherical plate structure, and the convex top of the hemispherical plate faces the piston body and can abut against the piston body.

[0019] In one embodiment, a mounting groove is provided on the wall of the mounting cavity, a connecting plate is provided around the shell, the shell portion is 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] In a second aspect, the present invention provides an engine torque measurement method, based on the engine torque measurement device in any of the above 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 torsion measuring shaft;

[0024] According to the output torque of the output shaft of the engine, the transmission bevel gear pushes the torsion measuring shaft to move axially, and the torsion measuring shaft pushes the piston body to move closer to the housing. The first oil drain hole and the second oil drain hole are disconnected, and the lubricating oil pressure in the oil circuit increases. The lubricating oil pushes the piston body to slide away from the housing. The first oil drain hole and the second oil drain hole are connected to drain oil, and the force applied by the lubricating oil on the piston body and the force applied by the torsion measuring shaft on the piston body reach a dynamic balance;

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

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides an engine torque measurement device and method. The device calibrates torque and oil pressure by correlating torque changes on an engine output shaft with changes in lubricating oil pressure. During engine operation, when the output torque of the engine output shaft increases, the axial load on the transmission helical gear toward the piston assembly 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, disconnecting the first and second oil drain holes. At this point, the oil pressure in the oil circuit of the mounting seat increases. The increased oil pressure pushes the piston body to slide axially until the second oil drain hole on the piston body is reconnected to the first oil drain hole on the housing. The piston body and the top plate reach a dynamic equilibrium position. An oil pressure sensor detects the current increased oil pressure. The increased oil pressure is used to obtain the output torque value corresponding to the bench calibration. This allows the engine output torque to be measured based on changes in oil pressure in the oil circuit. The device is simple in structure, easy to use, and low in cost. It also reduces the impact of electromagnetic interference on measurement accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the overall structure of the engine torque measurement device in an embodiment of the present invention;

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

[0030] In the picture:

[0031] 1. Mounting seat; 11. Mounting cavity; 12. Oil circuit; 13. Cylinder; 14. Cover; 141. Mounting hole; 15. Mounting slot;

[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. Stopper; 25. Sleeve; 26. Second bearing;

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

[0034] 4. Lubricating oil pressure sensor;

[0035] 5. Output shaft. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0040] like Figures 1 to 2 As shown, the X direction in the figure represents the axial sliding direction of the torque measuring shaft when the engine's output torque increases. An embodiment of the first aspect of the present invention provides an engine torque measuring device, comprising a mounting base 1, a torque measuring shaft 20, a piston assembly 3, and an 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 is capable of sliding relative to the mounting cavity 11. The torque measuring shaft 20 is provided with a transmission bevel gear 22, which is capable of drivingly connecting to the engine's output shaft 5. Rotation of the engine's output shaft 5 drives the torque measuring shaft 20 via the transmission bevel gear 22. Due to the helical tooth structure of the transmission bevel gear 22, when the output torque of the engine's output shaft 5 increases, the axial load on the transmission bevel gear 22 increases, and the transmission bevel gear 22 can propel the torque measuring shaft 20 to axial movement. A top plate 21 is rotatably disposed at the end of the torque measuring shaft 20. The top plate 21 is disposed within the mounting cavity 11 and is rotatably disposed at the end of the torque measuring shaft 20.

[0041] The piston assembly 3 is arranged in the mounting cavity 11. The piston assembly 3 includes a shell 31 and a piston body 32. The shell 31 is fixedly connected to the inner wall of the mounting seat 1, and the shell 31 can be supported by the mounting seat 1. The piston body 32 is slidably connected to the shell 31, and one end of the piston body 32 passes through the shell 31 and abuts against the top plate 21. A first oil drain hole 311 is provided on the shell 31, and a second oil drain hole 321 is provided on the piston body 32. The sliding of the piston body 32 can selectively connect or disconnect the first oil drain hole 311 and the second oil drain hole 321, that is, when the piston body 32 slides to a position where the first oil drain hole 311 and the second oil drain hole 321 are aligned, the connection between the first oil drain hole 311 and the second oil drain hole 321 can enable the lubricating oil in the oil circuit 12 to be drained. When the piston body 32 slides to a position where the first oil drain hole 311 and the second oil drain hole 321 are misaligned, the first oil drain hole 311 and the second oil drain hole 321 are disconnected, and the inner wall of the housing 31 can block the second oil drain hole 321. The oil circuit 12 is disposed within the mounting base 1 and has an oil inlet and an oil outlet. The oil outlet is connected to the second oil drain hole 321. The lubricating oil pressure sensor 4 is used to detect the oil pressure in the oil circuit 12.

[0042] With this arrangement, the engine torque measuring device can be set at the position of the engine's output shaft 5, which is in transmission connection with the transmission bevel gear 22. During the engine bench test, the engine's output shaft 5 outputs different torques in sequence, and the lubricating oil pressure sensor 4 can detect the corresponding lubricating oil pressure values ​​under different torques, so as to associate the torque changes on the engine output shaft 5 with the lubricating oil pressure changes, and complete the calibration of torque and lubricating oil pressure.

[0043] During the operation of the engine, when the output torque of the engine's output shaft 5 increases, the axial load of the transmission bevel gear 22 toward the piston assembly 3 increases, and the transmission bevel gear 22 can drive the torsion 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 no longer connected.

[0044] At this time, the lubricating oil pressure in the oil circuit 12 of the mounting seat 1 increases. The increased lubricating oil pressure 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, and 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 through the increased lubricating oil pressure, thereby realizing the measurement of the engine's output torque according to the change in the lubricating oil pressure in the oil circuit 12. It is not only simple in structure, easy to use, and low in cost, but also reduces the influence of electromagnetic interference on measurement accuracy and stability, and solves the problem in related technologies that the engine output torque needs to be detected by an electric torque measuring device, which is costly and susceptible to electromagnetic interference, affecting the measurement accuracy and stability.

[0045] like Figures 1 to 2 As shown, in some embodiments, an open groove 322 is provided at one end of the piston body 32 facing the oil inlet, and the open groove 322 is connected to the inner cavity of the housing 31 and the oil inlet. There are multiple second oil drain holes 321, and the multiple second oil drain holes 321 are arranged along the circumference of the piston body 32 and all of the multiple second oil drain holes 321 are connected to the open groove 322. With this arrangement, the groove cavity of the open groove 322 and the inner cavity enclosed by the piston body 32 and the housing 31 can store lubricating oil, increasing the flow space of the lubricating oil. Moreover, the provision of multiple second oil drain holes 321 not only facilitates the alignment and communication between the second oil drain holes 321 and the first oil drain holes 311, but also increases the oil leakage flow area.

[0046] In this embodiment, the housing 31 may also be provided with multiple first oil drain holes 311 to facilitate oil drain 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 relative rotation between the piston body 32 and the housing 31 and facilitating alignment between 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 seat 1, and 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 seat 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, and there is axial freedom between the inner ring 243 and the outer ring 241 of the first bearing 24, and can perform axial movement of a certain distance. The circumferential movement distance of the inner ring 243 and the outer ring 241 can meet the disconnection requirements of the first oil drain hole 311 and the second oil drain hole 321.

[0048] The roller 242 may be disposed on the outer ring 241 or on the inner ring 243 . The roller 242 may be, but is not limited to, a long roller bar, and may provide an axial space for relative movement between the inner ring 243 and the outer ring 241 .

[0049] In some other embodiments, a support frame may be provided between the torsion measuring shaft 20 and the mounting base 1. The support frame may be a cylindrical structure and may be mounted outside a first bearing 24. The first bearing 24 may be a common bearing structure such as a ball bearing. The support frame and the torsion measuring shaft 20 are rotatably connected via the first bearing 24, allowing the torsion measuring shaft 20 to flexibly rotate 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 bevel 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 squeeze the piston body 32 and slide, thereby disconnecting the first oil drain hole 311 and the second oil drain hole 321. A linear bearing may be provided between the support frame and the mounting cavity 11 to facilitate smooth and flexible sliding of the support frame relative to the mounting base 1. This embodiment, by installing the support frame, provides the torsion measuring shaft 20 with a larger axial sliding space relative to the mounting base 1.

[0050] In this embodiment, a guide structure, such as a guide rail or a guide groove, may be provided between the support frame and the mounting seat 1. The guide structure may be extended 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 seat 1.

[0051] In some embodiments, a limiting portion 244 is provided on the outer ring 241, and the limiting portion 244 is extended along the radial direction of the torsion measuring shaft 20. The side wall of the limiting portion 244 can abut against the mounting seat 1, that is, the limiting portion 244 can be provided along the radial direction of the torsion measuring shaft 20 and protrude from the surface of the torsion measuring shaft 20. When the torsion measuring shaft 20 drives the mounting seat 1 to slide toward the mounting cavity 11, pushing the top plate 21 to slide so that the second oil drain hole 321 on the piston body 32 is disconnected from the first oil drain hole 311 on the shell 31, the side wall of the limiting portion 244 can abut against the inner wall or the side wall of the groove of the mounting seat 1, thereby limiting the sliding position of the torsion measuring shaft 20 and preventing the torsion measuring shaft 20 from sliding excessively and damaging the piston assembly 3.

[0052] In this embodiment, the limiting portion 244 can be, but is not limited to, a plurality of point segment protrusions or annular protrusions. The limiting portion 244 can be arranged along the circumference of the mounting seat 1 to form a limiting effect on the sliding limit position of the outer ring 241.

[0053] In some embodiments, a flange 201 is provided on the torsion measuring shaft 20, and the flange 201 is provided on the side of the transmission bevel gear 22 close to the piston assembly 3. The transmission bevel gear 22 can abut against the flange 201, that is, when the axial load of the transmission bevel gear 22 increases, the transmission bevel gear 22 can drive the torsion measuring shaft 20 to slide axially through the connection position between its own center hole and the surface of the torsion measuring shaft 20 and the abutment position between the side wall of the transmission bevel gear 22 and the flange 201. The flange 201 can withstand a large axial load to avoid axial relative sliding of the transmission bevel gear 22 and the torsion measuring shaft 20.

[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 provides ample space for the arrangement and sliding of the torsion measuring shaft 20. The cover 14 is provided with a mounting hole 141, which is connected to the oil circuit 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 circuit 12 through the mounting hole 141. This ensures that the lubricating oil pressure sensor 4 is not only securely connected to the cover 14 but also accurately detects the lubricating oil pressure in the oil circuit 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, clamping, bonding or magnetic connection. A sealing structure can also be provided at the connection position between the cylinder 13 and the cover 14. The sealing structure can be, but is not limited to, a sealing ring, so that the cylinder 13 and the cover 14 are tightly connected and the connection sealing is improved. The torsion measuring shaft 20 can be provided as a whole in the cylinder 13, or the cylinder 13 can be a segmented structure, one cylinder segment can be provided at one end of the torsion measuring shaft 20, and the other cylinder segment can be provided at the other end of the torsion measuring shaft 20, so as to support both ends of the torsion measuring shaft 20. A first bearing 24 can be provided at both end positions 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 a second bearing 26. The sleeve 25 can be flexibly rotated relative to the torsion measuring shaft 20. When the torsion measuring shaft 20 rotates, the top plate 21 can maintain 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 of the top plate 21 and the piston body 32.

[0057] In some embodiments, 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 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 conduction of 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 flat to improve the stability of the top plate 21's abutment and reduce relative shaking between the two. Of course, for ease of processing, the top plate 21 can also be designed as a multi-faceted pyramidal plate structure, with the convex top of the top plate 21 facing the piston body 32 and capable of abutting against the piston body 32. The structure of the top plate 21 can be configured according to usage needs, as long as it can meet the requirements of the pushing operation 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 on the circumference of the shell 31. The shell 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 not limited to bolt connection or clamping. The shell 31 is extended into and connected to the mounting groove 15. The mounting groove 15 can radially limit the shell 31, and the two are firmly connected. Moreover, the connecting plate 312 is convexly provided on the circumference of the shell 31. The shell 31 is connected to the mounting seat 1 through the connecting plate 312, which can limit the axial sliding of the shell 31 and the mounting seat 1, thereby reducing the shaking and displacement of the shell 31 and improving the accuracy of the top plate 21 pushing the piston body 32.

[0060] In some embodiments, multiple seals are provided between the piston body 32 and the housing 31, and the multiple seals are arranged at intervals along the axial direction of the piston body 32 to perform sliding sealing between the piston body 32 and the housing 31, thereby reducing the leakage of lubricating oil pressure caused by the sliding of the piston body 32 relative to the housing 31, so as to maintain the stability of the lubricating oil pressure in the oil circuit 12.

[0061] In this embodiment, the seal may be made of an elastic material such as rubber or silicone, so that the seal and the piston body 32 or the seal and the housing 31 fit more closely, reducing the gap and having 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-mentioned engine torque measurement device, the engine torque measurement method specifically includes the following steps:

[0063] S100, obtaining lubricating oil pressure corresponding to different engine output torques;

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

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

[0066] S400 , detecting the lubricating oil pressure in the oil circuit 12 , and determining the output torque of the engine according to the lubricating oil pressure.

[0067] With this arrangement, during the engine bench test, the engine output shaft 5 outputs different torques in sequence, and the lubricating oil pressure sensor 4 can detect the corresponding lubricating oil pressure under the action of different torques, so as to associate 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.

[0068] During the operation of the engine, when the output torque of the engine's output shaft 5 increases, the axial load of the transmission bevel gear 22 toward the piston assembly 3 increases, and the transmission bevel gear 22 can drive the torsion 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 no longer connected.

[0069] At this time, the lubricating oil pressure in the oil circuit 12 of the mounting seat 1 increases. The increased lubricating oil pressure 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 and the force exerted by the torsion measuring shaft 20 on the piston body 32 can be equal to make 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 through the increased lubricating oil pressure value, thereby realizing the measurement of the engine's output torque according to the change in the 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 to reduce the influence of electromagnetic interference on measurement accuracy and stability.

[0070] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall 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: A mounting seat (1) having a mounting cavity (11); a torsion measuring shaft (20), the torsion measuring shaft (20) being rotatably arranged in the installation cavity (11), and the torsion measuring shaft (20) being able to slide relative to the installation cavity (11), a top plate (21) being rotatably arranged at the end of the torsion measuring shaft (20), a transmission bevel gear (22) being arranged on the torsion measuring shaft (20), and the transmission bevel gear (22) being able to be transmission-connected to an output shaft (5) of an engine; A piston assembly (3) is arranged in the mounting cavity (11), the piston assembly (3) comprising a shell (31) and a piston body (32), the shell (31) being fixedly connected to the inner wall of the mounting seat (1), the piston body (32) being slidably connected to the shell (31), and one end of the piston body (32) passing through the shell (31) to abut against the top plate (21); a first oil drain hole (311) is arranged on the shell (31), and a second oil drain hole (321) is arranged on the piston body (32), and the sliding of the piston body (32) can selectively connect or disconnect the first oil drain hole (311) and the second oil drain hole (321); A lubricating oil pressure sensor (4), wherein an oil circuit (12) is arranged in the mounting seat (1), the oil circuit (12) having an oil inlet and an oil outlet, the oil outlet being connected to the second oil drain hole (321), and the lubricating oil pressure sensor (4) is used to detect the lubricating oil pressure of the oil circuit (12).

2. The engine torque measuring device according to claim 1, characterized in that: An end of the piston body (32) facing the oil inlet is provided with an open groove (322), and the open groove (322) is connected to the inner cavity of the housing (31) and the oil inlet; There are multiple second oil drain holes (321), 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 arranged between the torsion measuring shaft (20) and the mounting seat (1), and the first bearing (24) comprises an outer ring (241), a roller (242) and an inner ring (243), and 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 seat (1), and the inner ring (243) is fixedly connected to the torsion measuring shaft (20), and 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: The outer ring (241) is provided with a limiting portion (244), the limiting portion (244) is extended along the radial direction of the torsion measuring shaft (20), and the side wall of the limiting portion (244) can abut against the mounting seat (1); and / or, The torsion measuring shaft (20) is provided with a flange (201), and the flange (201) is arranged on a side of the transmission bevel gear (22) close to the piston assembly (3), and the transmission bevel gear (22) can abut against the flange (201).

5. The engine torque measuring device according to claim 1, characterized in that: The mounting seat (1) comprises a cylinder (13) and a cover (14) which are detachably connected. One end of the torsion measuring shaft (20) is rotatably arranged in 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). The mounting hole (141) is connected to the oil circuit (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: A sleeve (25) is provided at the end of the torsion measuring shaft (20), the sleeve (25) is rotatably connected to the torsion measuring shaft (20) via 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: A mounting groove (15) is provided on the wall surface of the mounting cavity (11); a connecting plate (312) is provided in the circumference of the shell (31); a portion of the shell (31) is connected to the mounting groove (15); and a 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 measurement device according to any one of claims 1 to 9, the engine torque measurement method comprises: Obtain the lubricating oil pressure corresponding to different output torques of the engine; 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 output shaft of the engine, the transmission bevel gear pushes the torsion measuring shaft to move axially, and the torsion measuring shaft pushes the piston body to move closer to the housing, the first oil drain hole is disconnected from the second oil drain hole, the lubricating oil pressure in the oil circuit increases, the lubricating oil pushes the piston body to slide away from the housing, the first oil drain hole is connected to the second oil drain hole for oil draining, and the force applied by the lubricating oil to the piston body and the force applied by the torsion measuring shaft to the piston body reach a dynamic balance; The lubricating oil pressure in the oil circuit is detected, and the output torque of the engine is determined according to the lubricating oil pressure.

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