Measuring device

Abstract

The present invention relates to the field of engine detection technology, and more particularly to a measuring device. The device comprises a rotational speed measuring structure and an angle measuring structure. The rotational speed measuring structure comprises a rotational speed measuring device, a first supporting housing, and a first measuring shaft. The rotational speed measuring device measures the rotational speed of the engine crankshaft. The first supporting housing is fixedly mounted on the engine body, and the rotational speed measuring device is fixedly mounted on the first supporting housing. One end of the first measuring shaft is connected to the engine output shaft, and the first measuring shaft sleeve is provided with a code disk. The angle measuring structure comprises an angle measuring device, a second supporting housing, and a second measuring shaft. The angle measuring device measures the rotational angle of the engine crankshaft. The second supporting housing is fixedly mounted on the first supporting housing. The two ends of the second measuring shaft are respectively connected to the first measuring shaft and the angle measuring device. This allows for simultaneous measurement of the crankshaft's rotational angle and rotational speed, ensuring normal engine operation and safe and reliable acquisition of crankshaft rotational speed and angle information.

Description

Technical Field

[0001] The present invention relates to the technical field of engine detection, and in particular to a measuring device. Background Art

[0002] The speed and angle measurement device for marine low-speed engines is a key component of low-speed diesel engines. The engine's speed and angle signals are core inputs for engine control. Critical engine controls such as fuel injection, exhaust, and oil filling require accurate speed and angle signals and phase information, making the engine's speed and angle signals particularly important.

[0003] The mainstream speed and angle measurement devices currently used on marine engines use a single Hall effect sensor array to measure the engine's gear ring, generating square or sine wave signals to determine direction and speed. However, a disadvantage is that some hardware in the speed measurement system of low-speed marine engines lacks redundancy. Hardware failures can prevent proper startup and operation, requiring downtime for repairs and parts replacement, increasing diesel engine operating costs.

[0004] Therefore, a measuring device is urgently needed to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a measuring device that can safely and reliably obtain accurate speed and angle information to ensure normal operation of the engine.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A measuring device for measuring the rotational speed and rotational angle of an engine crankshaft, comprising a rotational speed measuring structure and a rotational angle measuring structure, wherein the rotational speed measuring structure comprises:

[0008] Tachometer, used to measure the engine crankshaft speed;

[0009] a first supporting shell, fixedly mounted on the engine body, at least two tachometers fixedly mounted on the first supporting shell, and measuring ends of the tachometers passing through the first supporting shell and placed in a cavity formed by the first supporting shell;

[0010] a first measuring shaft, both ends of which pass through the first supporting housing, one end of which is connected to the output shaft of the engine, a code disk being provided on the first measuring shaft sleeve, and the speed measuring device being arranged opposite to the code disk;

[0011] The rotation angle measurement structure includes:

[0012] Angle meter, used to measure the engine crankshaft angle;

[0013] a second supporting shell, the second supporting shell being fixedly connected to the first supporting shell;

[0014] The second measuring shaft is arranged in the second supporting shell, and both ends of the second measuring shaft pass through the cavity formed by the second supporting shell, one end of the second measuring shaft is fixedly connected to the other end of the first measuring shaft, and the other end of the second measuring shaft is transmission-connected to the two rotation angle measuring devices.

[0015] As a preferred technical solution of the above-mentioned measuring device, the angle measuring structure further includes a transmission assembly, the angle measuring device is provided with a first pulley, and the transmission assembly includes:

[0016] Two second pulleys are provided at the other end of the second measuring shaft, and the two second pulleys are spaced apart;

[0017] A transmission belt is respectively connected to the second pulley and the first pulley for transmission.

[0018] As a preferred technical solution of the above-mentioned measuring device, one of the angle measuring devices is provided on both sides of the second measuring shaft, one of the second pulleys is provided on both sides of the first pulley, and the first pulley is respectively connected to the two second pulleys in a transmission manner.

[0019] As a preferred technical solution of the above-mentioned measuring device, the second supporting shell is connected to the first supporting shell by connecting bolts, and a distance tube is provided between the first supporting shell and the second supporting shell and is sleeved on the connecting bolts, and the two ends of the distance tube are respectively against the first supporting shell and the second supporting shell.

[0020] As a preferred technical solution of the above-mentioned measuring device, it also includes a third measuring shaft and a third supporting shell, the third supporting shell is fixedly connected to the engine and the first supporting shell respectively, the two ends of the third measuring shaft are connected to the engine crankshaft and the first measuring shaft respectively, the third measuring shaft is fixedly set on the body of the engine, and the third measuring shaft and the first measuring shaft extend into the chamber formed by the third supporting shell and are connected by a coupling.

[0021] As a preferred technical solution of the above-mentioned measuring device, the third measuring shaft includes a shaft body and a connecting plate, the shaft body and the connecting plate are an integrally formed structure, and the connecting plate is fixedly connected to the output shaft of the engine.

[0022] As a preferred technical solution of the above-mentioned measuring device, the third supporting shell is provided with an observation hole, the observation hole is covered with a glass cover, and a gasket is provided between the glass cover and the observation hole.

[0023] As a preferred technical solution of the above-mentioned measuring device, the third support shell is connected to the engine via fixing bolts, and a cam locking washer is provided between the third support shell and the fixing bolts.

[0024] As a preferred technical solution of the above-mentioned measuring device, the third supporting shell and the engine are both provided with pin holes, and cylindrical pins are provided in the pin holes.

[0025] As a preferred technical solution of the above-mentioned measuring device, the first measuring shaft and the second measuring shaft are interference fit.

[0026] Beneficial effects of the present invention:

[0027] The present invention is connected to the engine crankshaft and the first measuring shaft respectively through a second measuring shaft, wherein the angle measuring device is used to measure the angle of the crankshaft, and the speed measuring device is used to measure the speed of the crankshaft, thereby achieving the purpose of simultaneously measuring the angle and speed of the crankshaft. In addition, there are two angle measuring devices, and when one of the angle measuring devices fails, the other can work normally; at the same time, there are at least two speed measuring devices, so when one of the speed measuring devices fails, the other can work normally, so that the engine can operate normally, and the speed and angle information of the crankshaft can be obtained safely and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0029] Figure 1 A schematic structural diagram of a measuring device provided in an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Cross-sectional view at AA in the middle.

[0031] In the picture:

[0032] 1. Speed ​​measurement structure; 11. Speed ​​meter; 12. First support shell; 13. First measuring shaft; 14. Code disk; 2. Angle measurement structure; 21. Angle meter; 22. Second support shell; 23. Second measuring shaft; 24. First pulley; 25. Second pulley; 26. Drive belt; 3. Connecting bolt; 4. Distance tube; 5. Third measuring shaft; 51. Shaft body; 52. Connecting plate; 6. Third support shell; 7. Glass cover; 8. Gasket; 9. Fixing bolt; 10. Coupling. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not 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 meanings.

[0037] A measuring device is provided in an embodiment of the present invention for measuring the rotational speed and rotation angle of a crankshaft of an engine, wherein the engine is a low-speed marine engine, specifically, a low-speed diesel engine with a cylinder diameter of 340 mm.

[0038] like Figure 1 and Figure 2 As shown, the measuring device includes a speed measuring structure 1 and an angle measuring structure 2, wherein the speed measuring structure 1 is used to measure the speed of the crankshaft, while the angle measuring structure 2 is used to measure the angle of the crankshaft. The measuring device can achieve the purpose of simultaneous measurement of the angle and speed of the crankshaft. The speed measuring structure 1 includes a speed meter 11, a first support shell 12 and a first measuring shaft 13, wherein the speed meter 11 is used to measure the speed of the engine crankshaft; the first support shell 12 is fixedly mounted on the engine body, at least two speed meters 11 are fixedly mounted on the first support shell 12, and the measuring end of the speed meter 11 passes through the first support shell 12 and is placed in the chamber formed by the first support shell 12; both ends of the first measuring shaft 13 pass through the first support shell 12, one end of the first measuring shaft 13 is connected to the output shaft of the engine, the first measuring shaft 13 is sleeved with a code disk 14, and the speed meter 11 and the code disk 14 are arranged oppositely;

[0039] The angle measuring structure 2 includes an angle measuring device 21, a second supporting shell 22 and a second measuring shaft 23, wherein the angle measuring device 21 is used to measure the engine crankshaft angle; the second supporting shell 22 is fixedly connected to the first supporting shell 12; the second measuring shaft 23 is arranged in the chamber formed by the second supporting shell 22, and both ends of the second measuring shaft 23 pass through the second supporting shell 22, one end of the second measuring shaft 23 is fixedly connected to the other end of the first measuring shaft 13, and the other end of the second measuring shaft 23 is transmission-connected to the two angle measuring devices 21.

[0040] In an embodiment of the present invention, a second measuring shaft 23 is respectively connected to the engine crankshaft and the first measuring shaft 13, wherein the angle measuring device 21 is used to measure the angle of the crankshaft, and the speed measuring device 11 is used to measure the speed of the crankshaft. In this way, the purpose of simultaneously measuring the angle and speed of the crankshaft can be achieved. In addition, there are two angle measuring devices 21. If one of the angle measuring devices 21 fails, the other can work normally. At the same time, there are at least two speed measuring devices 11. In this way, if one of the speed measuring devices 11 fails, the other speed measuring devices 11 can work normally, so that the engine can operate normally, and the speed and angle information of the crankshaft can be obtained safely and reliably.

[0041] In some embodiments, the angle measuring structure 2 also includes a transmission assembly, which can enable the two angle measuring devices 21 to work simultaneously. Correspondingly, the angle measuring device 21 is provided with a first pulley 24, and the transmission assembly includes a transmission belt 26 and two second pulleys 25, wherein the two second pulleys 25 are provided at the other end of the second measuring shaft 23, and the two second pulleys 25 are provided at intervals. The angle measuring devices 21 are respectively provided on both sides of the second measuring shaft 23, so that a second pulley 25 is provided on both sides of the first pulley 24, and the transmission belt 26 is respectively connected to the second pulley 25 and the first pulley 24 for transmission. When the second measuring shaft 23 rotates, the two second pulleys 25 can be driven to rotate through the first pulley 24. Since each angle measuring device 21 is provided with a second pulley 25, each angle measuring device 21 can rotate with the second pulley 25, thereby achieving the purpose of measuring the angle measuring device 21.

[0042] For example, in this embodiment, the angle measuring device 21 is an angle encoder, the structure of which is prior art and will not be described in detail here. The connection between the angle measuring structure 2 and the first measuring shaft 13 is prior art and will not be described in detail here.

[0043] Because the second measuring shaft 23 is connected to the first measuring shaft 13, and to facilitate the connection between the first and second measuring shafts 13, the length of the second measuring shaft 23 is greater than the thickness of the angle measuring device 21. Therefore, the second supporting housing 22 is configured to correspond to the length of the second measuring shaft 23. The second supporting housing 22 is fixedly connected to the first supporting housing 12, specifically, via connecting bolts 3. To protect the connecting bolts 3 during operation, a spacer tube 4 is provided between the first and second supporting housings 12 and 22. The spacer tube 4 is sleeved over the connecting bolts 3, with its ends respectively abutting against the first and second supporting housings 12 and 22.

[0044] In this embodiment, the first measuring shaft 13 and the second measuring shaft 23 are interference-fitted, which can facilitate the installation of the first measuring shaft 13 and the second measuring shaft 23 and also achieve the purpose of simultaneous rotation of the first measuring shaft 13 and the second measuring shaft 23.

[0045] To prevent hard transmission during crankshaft rotation, in some embodiments, the measuring device further includes a third measuring shaft 5 and a third support housing 6. The third support housing 6 is fixedly connected to the engine and the first support housing 12, respectively. The ends of the third measuring shaft 5 are connected to the engine crankshaft and the first measuring shaft 13, respectively. The third measuring shaft 5 is fixedly mounted on the engine body. The third measuring shaft 5 and the first measuring shaft 13 extend into the chamber formed by the third support housing 6 and are connected by a coupling 10. The coupling 10 is an elastic coupling, so that hard transmission of the crankshaft can be absorbed by the elastic coupling, thereby ensuring stable output of the first measuring shaft 13 and the second measuring shaft 23.

[0046] Specifically, the third measurement shaft 5 comprises a main shaft 51 and a connecting plate 52. The main shaft 51 and connecting plate 52 are integrally formed, and the connecting plate 52 is fixedly connected to the engine's output shaft. The connecting plate 52 secures the entire third measurement shaft 5 to the end of the crankshaft, while the main shaft 51 connects to the first measurement shaft 13 via the coupling 10.

[0047] In order to facilitate the installation of the third measuring shaft 5 and the first measuring shaft 13, the third supporting housing 6 is provided with an observation hole, which is covered with a glass cover 7. A gasket 8 is provided between the glass cover 7 and the observation hole. The provision of the gasket 8 serves the purpose of good sealing.

[0048] Specifically, in order to protect the third measuring shaft 5 , the third support housing 6 is connected to the engine via a fixing bolt 9 , and a cam locking washer is provided between the third support housing 6 and the fixing bolt 9 .

[0049] In order to achieve positioning before installing the third support housing 6, in this embodiment, the third support housing 6 and the engine are both provided with pin holes, and cylindrical positioning pins are provided in the pin holes to prevent the third measuring shaft 5 from rotating during installation and affecting subsequent installation.

[0050] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A measuring device for measuring the rotational speed and rotational angle of an engine crankshaft, comprising a rotational speed measuring structure (1) and a rotational angle measuring structure (2), characterized in that: The rotation speed measurement structure (1) comprises: A speed meter (11) for measuring the speed of the engine crankshaft; A first supporting shell (12) is fixedly mounted on the engine body, at least two rotation speed measuring devices (11) are fixedly mounted on the first supporting shell (12), and measuring ends of the rotation speed measuring devices (11) pass through the first supporting shell (12) and are placed in a cavity formed by the first supporting shell (12); a first measuring shaft (13), both ends of the first measuring shaft (13) passing through the first supporting housing (12), one end of the first measuring shaft (13) being connected to the output shaft of the engine, a code disk (14) being sleeved on the first measuring shaft (13), and the speed measuring device (11) and the code disk (14) being arranged relative to each other; The rotation angle measurement structure (2) comprises: An angle measuring device (21) is used to measure the engine crankshaft angle; a second supporting shell (22), the second supporting shell (22) being fixedly connected to the first supporting shell (12); A second measuring shaft (23) is disposed in the second supporting shell (22), with both ends of the second measuring shaft (23) passing through a cavity formed by the second supporting shell (22), one end of the second measuring shaft (23) being fixedly connected to the other end of the first measuring shaft (13), and the other end of the second measuring shaft (23) being transmission-connected to the two rotation angle measuring devices (21); The rotation angle measurement structure (2) further comprises a transmission assembly, the rotation angle measuring device (21) is provided with a first pulley (24), and the transmission assembly comprises: Two second pulleys (25) are arranged at the other end of the second measuring shaft (23), and the two second pulleys (25) are arranged at intervals; a transmission belt (26), wherein the transmission belt (26) is respectively connected to the second pulley (25) and the first pulley (24); The second supporting shell (22) is connected to the first supporting shell (12) via a connecting bolt (3), and a distance tube (4) sleeved on the connecting bolt (3) is provided between the first supporting shell (12) and the second supporting shell (22), with both ends of the distance tube (4) respectively abutting against the first supporting shell (12) and the second supporting shell (22).

2. The measuring device according to claim 1, characterized in that A rotation angle measuring device (21) is provided on both sides of the second measuring shaft (23), a second pulley (25) is provided on both sides of the first pulley (24), and the first pulley (24) is respectively connected to the two second pulleys (25) in a transmission manner.

3. The measuring device according to claim 1, characterized in that The invention also includes a third measuring shaft (5) and a third supporting shell (6), wherein the third supporting shell (6) is fixedly connected to the engine and the first supporting shell (12) respectively, and the two ends of the third measuring shaft (5) are connected to the engine crankshaft and the first measuring shaft (13) respectively. The third measuring shaft (5) is fixedly arranged on the body of the engine, and the third measuring shaft (5) and the first measuring shaft (13) extend into the chamber formed by the third supporting shell (6) and are connected through a coupling (10).

4. The measuring device according to claim 3, characterized in that The third measuring shaft (5) comprises a shaft body (51) and a connecting plate (52); the shaft body (51) and the connecting plate (52) are an integrally formed structure; and the connecting plate (52) is fixedly connected to the output shaft of the engine.

5. The measuring device according to claim 3, characterized in that The third supporting shell (6) is provided with an observation hole, the observation hole is covered with a glass cover (7), and a gasket (8) is provided between the glass cover (7) and the observation hole.

6. The measuring device according to claim 3, characterized in that The third support housing (6) is connected to the engine via a fixing bolt (9), and a cam locking washer is provided between the third support housing (6) and the fixing bolt (9).

7. The measuring device according to claim 3, characterized in that The third supporting shell (6) and the engine are both provided with pin holes, and cylindrical pins are provided in the pin holes.

8. The measuring device according to any one of claims 1 to 7, characterized in that: The first measuring shaft (13) and the second measuring shaft (23) are interference fit.

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