Measuring device and measuring method

Abstract

The present invention relates to the technical field of engine phase measurement. The present application provides a measuring device and a measuring method. The engine includes a camshaft assembly, a transition plate of the measuring device is plugged into a cover, the transition plate is provided with a first plug-in hole, the camshaft sleeve is provided with a first stepped hole, the large diameter end of the first stepped hole is fixedly sleeved outside the camshaft bolt, the camshaft sleeve is inserted into the first plug-in hole, and the outer peripheral wall of the camshaft sleeve is abutted against the inner peripheral wall of the first plug-in hole; the first transition plug-in is inserted and fixed to the small diameter end of the first avoidance hole, the first encoder is fixedly sleeved on the first mounting rod, and the first mounting rod is inserted and fixed to the first transition plug-in. In this way, the installation process is simple, the coaxiality of the first encoder and the camshaft can be maintained, and in the measurement stage, the actual piston top dead center and crankshaft angle deviation are introduced to clarify the area causing the error, thereby making the measured value more accurate.

Description

Technical Field

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

[0002] The engine valve timing has a great impact on the engine's performance, fuel consumption, and reliability. The existing engine mechanical timing phase measurement method generally selects several lift characteristic positions of the camshaft peach as characteristic points during the valve opening stage, finds the theoretical corresponding crankshaft angle, and then uses a goniometer to manually measure the crankshaft angle that actually corresponds to the lift. Through the theoretical relationship between the theoretical crankshaft angle and the actual measured value, the relative deviation of the phase in the assembled state compared to the theoretical value is confirmed. The existing testing methods have problems such as a large accuracy range (test accuracy of ±3°), and the phase relationship cannot correspond to the piston running position, resulting in a large initial phase deviation value of the engine installation, which seriously affects the initial performance of the engine and the consistency of test and production.

[0003] For five-axis V-type machines, especially those that rely on idler gears for transmission, the existing detection method requires the detection of four camshafts in sequence, which requires four disassembly and assembly during the detection. The multiple disassembly and assembly during the measurement process will not only seriously affect the accuracy of the test, resulting in inaccurate measurement results, but also complicate the operation process, seriously affecting work efficiency.

[0004] The existing detection method can only be carried out on a test bench, and is performed manually by turning the crankshaft. This is very different from the actual operating state of the five-axis engine and cannot accurately and efficiently measure the true phase of the five-axis engine operating state.

[0005] In addition, the measured installation phase deviation value and dynamic phase deviation value between the crankshaft and the camshaft both contain the angular deviation between the piston top dead center and the crankshaft. As a result, when the measurement data error is large, it is difficult to determine the cause of the error. Repeated measurements are the only option to obtain values ​​that meet the calculation requirements. However, since a single measurement is extremely time-consuming, repeated measurements increase the difficulty of the work.

[0006] Therefore, there is an urgent need for a measuring device and a measuring method to solve the above technical problems. Summary of the invention

[0007] The object of the present invention is to provide a measuring device and a measuring method, which can be easily installed and more accurately determine the cause of the error, thereby avoiding repeated measurements.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] A measuring device for measuring the valve timing of an engine, wherein the engine comprises a camshaft assembly, wherein the camshaft assembly comprises a camshaft, a camshaft bolt and a cover, wherein the camshaft bolt is coaxially threadedly connected to the camshaft, and the cover is provided with a first avoidance hole coaxial with the camshaft, wherein the measuring device comprises:

[0010] A transition plate, the transition plate comprising a first plug-in portion and a first abutment portion, the first plug-in portion being plugged into the first avoidance hole, the first abutment portion being abutted and fixed to the end surface of the first avoidance hole on the side of the cover facing away from the camshaft, the first plug-in portion being provided with a first plug-in hole, the first plug-in hole being provided coaxially with the camshaft;

[0011] A camshaft sleeve, wherein the camshaft sleeve is provided with a first stepped hole, the first stepped hole is coaxially provided with the camshaft, the large diameter end of the first stepped hole is fixedly sleeved outside the camshaft bolt, the camshaft sleeve is inserted into the first plug hole, and the outer peripheral wall of the camshaft sleeve abuts against the inner peripheral wall of the first plug hole;

[0012] A first transition plug-in, the first transition plug-in is inserted and fixed to the small-diameter end of the first avoidance hole, the first transition plug-in is provided with a first mounting hole, and the first mounting hole is coaxially provided with the first stepped hole;

[0013] A first encoder and a first mounting rod, wherein the first encoder is fixedly sleeved on the first mounting rod, and the first mounting rod is inserted and fixed in the first mounting hole.

[0014] As a preferred technical solution of the above-mentioned measuring device, the transition plate and the above-mentioned cover are fixed by threaded fasteners, and the above-mentioned threaded fasteners are provided in plurality and are evenly distributed around the axis of the above-mentioned first avoidance hole.

[0015] As a preferred technical solution of the above-mentioned measuring device, the above-mentioned first mounting rod is threadedly connected to the above-mentioned first transition plug-in.

[0016] As a preferred technical solution of the above-mentioned measuring device, a first handle is fixedly sleeved on a side of the above-mentioned first mounting rod away from the above-mentioned camshaft sleeve, and the above-mentioned first encoder is located between the above-mentioned first handle and the above-mentioned camshaft sleeve.

[0017] As a preferred technical solution of the above-mentioned measuring device, an elastic steel sheet is sandwiched between the above-mentioned camshaft sleeve and the above-mentioned camshaft bolt, and the above-mentioned elastic steel sheet can fill the axial gap between the camshaft sleeve and the above-mentioned camshaft bolt.

[0018] As a preferred technical solution of the above-mentioned measuring device, the above-mentioned engine includes a crankshaft assembly, and the above-mentioned crankshaft assembly includes a crankshaft, a pulley and a pulley bolt, the above-mentioned pulley bolt is coaxially connected with the above-mentioned crankshaft and the above-mentioned pulley and is threadedly connected with the above-mentioned crankshaft, and the above-mentioned crankshaft is drivingly connected with the above-mentioned camshaft. The above-mentioned measuring device includes:

[0019] A crankshaft sleeve, wherein the crankshaft sleeve is provided with a second stepped hole along its axial direction, and a large diameter end of the second stepped hole is sleeved on an end of the pulley bolt facing away from the crankshaft;

[0020] A second transition plug-in, the second transition plug-in is plugged and fixed to the small-diameter end of the second stepped hole, the second transition plug-in is provided with a second mounting hole, and the second mounting hole is coaxially arranged with the second stepped hole;

[0021] A second encoder and a second mounting rod, wherein the second encoder is fixedly sleeved on the second mounting rod, and the second mounting rod is fixedly inserted into the second mounting hole.

[0022] As a preferred technical solution of the above-mentioned measuring device, it also includes a piston position sensor and a connecting sleeve, the connecting sleeve is threadedly connected to the cylinder head, and the piston position sensor is inserted into the connecting sleeve.

[0023] As a preferred technical solution of the above-mentioned measuring device, it also includes a data acquisition system, and the above-mentioned data acquisition system is communicatively connected with the above-mentioned piston position sensor, the above-mentioned first encoder and the above-mentioned second encoder.

[0024] As a preferred technical solution of the above-mentioned measuring device, it also includes a dynamometer and a transmission shaft, and the above-mentioned dynamometer is connected to the above-mentioned crankshaft through the above-mentioned transmission shaft.

[0025] A measurement method is also provided. Based on the above-mentioned measurement device, the above-mentioned data acquisition system receives the feedback signals of the above-mentioned first encoder, the above-mentioned second encoder and the above-mentioned piston position sensor, and performs calculations. The calculation formula is as follows:

[0026] Installation phase deviation β1 = (b1-d1) + a;

[0027] Dynamic phase deviation β2 = (b2-d2) + a;

[0028] Actual phase deviation β = β1-β2;

[0029] Wherein, the above a is the deviation between the actual piston top dead center and the crankshaft angle; the above b1 is the installation crankshaft angle;

[0030] The above b2 is the dynamic crankshaft angle; the above d1 is the installed camshaft angle; and d2 is the dynamic camshaft angle.

[0031] Beneficial effects of the present invention:

[0032] The present application provides a measuring device for measuring the valve timing phase of an engine, wherein the engine comprises a camshaft assembly, wherein the camshaft assembly comprises a camshaft, a camshaft bolt and a cover, wherein the camshaft bolt is coaxially threadedly connected to the camshaft, and the cover is provided with a first avoidance hole coaxial with the camshaft, and the measuring device comprises a transition plate, a camshaft sleeve, a first transition plug-in, a first encoder and a first mounting rod. Among them, the transition plate includes a first plug-in portion and a first abutting portion, the first plug-in portion is plugged into the first avoidance hole, the first abutting portion abuts and is fixed to the end face of the first avoidance hole on the side of the cover facing away from the camshaft, the first plug-in portion is provided with a first plug-in hole, the first plug-in hole is coaxially opened with the camshaft, the camshaft sleeve is provided with a first step hole, the first step hole is coaxially opened with the camshaft, the large diameter end of the first step hole is fixedly sleeved outside the camshaft bolt, the camshaft sleeve is inserted in the first plug-in hole, and the outer peripheral wall of the camshaft sleeve abuts against the inner peripheral wall of the first plug-in hole; the first transition plug-in is inserted and fixed at the small diameter end of the first avoidance hole, the first transition plug-in is provided with a first mounting hole, and the first mounting hole is coaxially opened with the first step hole; the first encoder is fixedly sleeved on the first mounting rod, and the first mounting rod is inserted and fixed in the first mounting hole. With such an arrangement, during installation, it is only necessary to remove the valve body originally installed in the first avoidance port to expose the camshaft bolt from the avoidance port, and then install the transition plate on the cover, and install the camshaft sleeve, the first transition plug-in, the first mounting rod and the first encoder in sequence along the axial direction of the camshaft. The installation process is simple, and the various workpieces support each other, which can maintain the coaxiality of the first encoder and the camshaft, making the measurement result more accurate.

[0033] A measuring method using the above-mentioned measuring device is also provided. During the measuring stage, the actual piston top dead center and crankshaft angle deviation are added to the installation phase deviation and the dynamic phase deviation. In this way, the influence of the actual piston top dead center and crankshaft angle deviation can be removed from the measured data, and only the installation deviation value between the crankshaft and the camshaft is considered. In this way, the area causing the error can be more clearly identified, thereby making the measured value more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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 the description of 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 paying any creative work.

[0035] Figure 1 is a schematic structural diagram of a measuring device (camshaft assembly part) provided in an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the installation structure of the transition plate and the cover provided by an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of the structure of a measuring device (crankshaft assembly part) provided in an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the structure of the measuring device (cylinder part) provided in an embodiment of the present invention;

[0039] Figure 5 is a structural schematic diagram of a five-axis engine provided by an embodiment of the present invention;

[0040] Figure 6 It is a schematic diagram of a measurement method provided by an embodiment of the present invention.

[0041] In the figure:

[0042] 110, camshaft; 111, left intake camshaft; 112, left exhaust camshaft; 113, right intake camshaft; 114, right exhaust camshaft; 120, camshaft bolts; 130, sprocket; 131, left intake sprocket; 132, left exhaust sprocket; 133, right intake sprocket; 134, right exhaust sprocket; 141, left chain; 142, right chain; 143, middle chain; 151, left idler; 152, right idler; 153, middle idler;

[0043] 200, cover;

[0044] 310, crankshaft; 320, pulley; 330, pulley bolt; 340, pulley bolt gasket; 350, oil seal structure; 360, crankshaft sprocket;

[0045] 410, transition plate; 420, camshaft sleeve; 430, first transition plug-in; 440, first encoder; 441, left intake camshaft encoder; 442, left exhaust camshaft encoder; 443, right intake camshaft encoder; 444, right exhaust camshaft encoder; 450, first mounting rod; 460, threaded fastener; 470, first handle; 480, elastic steel sheet;

[0046] 510, crankshaft sleeve; 520, second transition plug-in; 530, second encoder; 540, second mounting rod; 550, second handle;

[0047] 610, piston position sensor; 620, connecting sleeve; 621, third plug-in portion; 622, third abutting portion; 623, clamping portion; 630, cylinder head;

[0048] 700. Data acquisition system. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0053] like Figures 1 to 5As shown, the present application provides a measuring device for measuring the valve timing of an engine, the engine includes a camshaft assembly, the camshaft assembly includes a camshaft 110, a camshaft bolt 120 and a cover 200, the camshaft bolt 120 is coaxially threaded with the camshaft 110, the cover 200 is provided with a first avoidance hole coaxial with the camshaft 110, the measuring device includes a transition plate 410, a camshaft sleeve 420, a first transition plug-in 430, a first encoder 440 and a first mounting rod 450. The transition plate 410 includes a first plug-in portion and a first abutment portion, the first plug-in portion is plugged into the first avoidance hole, the first abutment portion is abutted and fixed to the end face of the first avoidance hole on the side of the cover 200 facing away from the camshaft 110, the first plug-in portion is provided with a first plug-in hole, the first plug-in hole is coaxially provided with the camshaft 110, the camshaft sleeve 420 is provided with a first stepped hole, the first stepped hole is coaxially provided with the camshaft 110, the large diameter end of the first stepped hole is fixedly sleeved on the cam Outside the shaft bolt 120, the camshaft sleeve 420 is inserted into the first plug-in hole, and the outer circumferential wall of the camshaft sleeve 420 abuts against the inner circumferential wall of the first plug-in hole; the first transition plug-in 430 is inserted and fixed at the small diameter end of the first avoidance hole, and the first transition plug-in 430 is provided with a first mounting hole, and the first mounting hole is coaxially provided with the first stepped hole; the first encoder 440 is fixedly sleeved on the first mounting rod 450, and the first mounting rod 450 is inserted and fixed in the first mounting hole.

[0054] Specifically, the camshaft sleeve 420 is fixedly sleeved on the camshaft bolt 120. Since the camshaft bolt 120 is threadedly connected to the camshaft 110 and is coaxially arranged, the coaxiality between the camshaft sleeve 420 and the camshaft 110 can be ensured. Furthermore, in order to limit the camshaft sleeve 420 from swinging relative to the camshaft bolt 120 and affecting the coaxiality, in this embodiment, the radial space between the camshaft sleeve 420 and the cover 200 is filled by the transition plate 410. The transition plate 410 includes a first plug-in portion and a first abutting portion. The first abutting portion is used to be fixed to the cover 200, and the first plug-in portion is inserted into the first avoidance hole. The inner circumferential wall of the first plug-in portion abuts against the outer circumferential wall of the camshaft sleeve 420, and the outer circumferential wall of the first plug-in portion abuts against the inner circumferential wall of the first avoidance hole. In this way, the transition plate 410 can straighten the camshaft sleeve 420 so that the camshaft sleeve 420 remains aligned with the cover 200. The camshaft bolt 120 is coaxially arranged; the first mounting rod 450 is installed on the camshaft sleeve 420 through the first transition plug-in 430, wherein the first transition plug-in 430 includes a second plug-in portion and a second abutment portion, wherein the second plug-in portion is plugged into the small diameter end of the camshaft sleeve 420 and can abut against the camshaft bolt 120 along the axial direction, and the second abutment portion abuts on the side of the camshaft sleeve 420 facing away from the camshaft 110, thereby limiting the swing of the first transition plug-in 430 relative to the camshaft sleeve 420 to ensure the coaxiality between the first mounting rod 450 and the camshaft 110, and the first encoder 440 is sleeved on the first mounting rod 450. Since the first mounting rod 450, the first transition plug-in 430, the camshaft sleeve 420 and the camshaft bolt 120 are all coaxially arranged with the camshaft 110, the first encoder 440 can measure the installation deviation of the camshaft 110.

[0055] With such arrangement, during installation, it is only necessary to remove the valve body originally installed in the first avoidance port so that the camshaft bolt 120 is exposed from the avoidance port, and then install the transition plate 410 on the cover 200, and install the camshaft sleeve 420, the first transition plug-in 430, the first mounting rod 450 and the first encoder 440 in sequence along the axial direction of the camshaft 110. The installation process is simple, and the various workpieces support each other, which can maintain the coaxiality of the first encoder 440 and the camshaft 110, making the measurement result more accurate.

[0056] Furthermore, in order to maintain the relative fixation between the transition plate 410 and the cover 200, it is necessary to avoid the axis of the first stepped hole in the transition plate 410 from intersecting with the axis of the first avoidance hole, and to ensure that when the camshaft 110 rotates, the transition plate 410 can still straighten the camshaft sleeve 420. For this reason, in this embodiment, the transition plate 410 and the cover 200 are fixed by threaded fasteners 460, and a plurality of threaded fasteners 460 are provided and evenly distributed around the axis of the first avoidance hole. The fixing by the threaded fasteners 460 facilitates the installation and disassembly of the transition plate 410 and the cover 200. At the same time, the plurality of threaded fasteners 460 are evenly arranged along the axial direction of the first avoidance hole, so that the force application points between the transition plate 410 and the cover 200 are evenly distributed, and then when the transition plate 410 has a tendency to rotate relative to the cover 200, each threaded fastener 460 is evenly stressed.

[0057] In other embodiments, the first avoidance hole is a threaded hole, the outer peripheral wall of the first plug-in portion of the transition plate 410 is provided with a corresponding threaded structure, and the transition plate 410 is threadedly connected to the cover 200 .

[0058] Optionally, the first mounting rod 450 is threadedly connected to the first transition plug-in unit 430. Thus, through the threaded connection, the first mounting rod 450 and the first transition plug-in unit 430 can be kept relatively fixed.

[0059] Optionally, a first handle 470 is fixedly sleeved on one side of the first mounting rod 450 away from the camshaft sleeve 420, and the first encoder 440 is located between the first handle 470 and the camshaft sleeve 420. Specifically, both axial ends of the first mounting rod 450 are provided with threads, one end of which is threadedly fixed to the first transition plug-in 430, and the other end is threadedly connected to the first handle 470, and the first handle 470 is perpendicular to the first mounting rod 450. In this way, the first mounting rod 450 is easier to be installed on the first transition plug-in 430 through the first handle 470, and the first encoder 440 is clamped between the first handle 470 and the first transition plug-in 430 to prevent the first encoder 440 from escaping from the first handle 470 when the camshaft 110 rotates.

[0060] Optionally, an elastic steel sheet 480 is sandwiched between the camshaft sleeve 420 and the camshaft bolt 120, and the elastic steel sheet 480 can fill the axial gap between the camshaft sleeve 420 and the camshaft bolt 120. Specifically, the elastic steel sheet 480 is arched, including two end points and a vertex located between the two end points. The elastic steel sheet 480 is wrapped around the circumference of the camshaft bolt 120, and the axis of the elastic steel sheet 480 is parallel to the circumference of the camshaft bolt 120. Both end points of the elastic steel sheet 480 are in contact with the circumference of the camshaft bolt 120. When the camshaft sleeve 420 is sleeved outside the camshaft bolt 120, the elastic steel sheet 480 is sandwiched between the camshaft sleeve 420 and the camshaft bolt 120, and the elastic steel sheet 480 is protected. The radial force along the camshaft sleeve 420 causes the apex of the elastic steel sheet 480 to approach the peripheral side wall of the camshaft bolt 120, and the elastic steel sheet 480 is deformed. Its two end points apply force to the camshaft bolt 120, and the apex applies force to the camshaft sleeve 420. In this way, the elastic steel sheet 480 fills the radial gap between the camshaft sleeve 420 and the camshaft bolt 120, straightens the camshaft sleeve 420 from the inside, and further maintains the coaxiality between the camshaft sleeve 420 and the camshaft bolt 120.

[0061] Optionally, the engine includes a crankshaft assembly, the crankshaft assembly includes a crankshaft 310, a pulley 320 and a pulley bolt 330, the pulley bolt 330 is coaxially connected to the crankshaft 310 and the pulley 320 and is threadedly connected to the crankshaft 310, the crankshaft 310 is transmission-connected to the camshaft 110, and the measuring device also includes a crankshaft sleeve 510, a second transition plug-in 520, a second encoder 530 and a second mounting rod 540. The crankshaft sleeve 510 is provided with a second stepped hole along its axial direction, the large-diameter end of the second stepped hole is sleeved on the end of the pulley bolt 330 facing away from the crankshaft 310; the second transition plug-in 520 is plugged and fixed to the small-diameter end of the second stepped hole, the second transition plug-in 520 is provided with a second mounting hole, and the second mounting hole is coaxially arranged with the second stepped hole; the second encoder 530 is fixedly sleeved on the second mounting rod 540, and the second mounting rod 540 is fixedly inserted in the second mounting hole.

[0062] In this way, the crankshaft sleeve 510, the second transition plug-in 520, the second installation rod 540 and the second encoder 530 are sequentially installed along the axial direction. The structure is simple and easy to disassemble.

[0063] Specifically, the cover 200 is provided with a second avoidance hole, the pulley bolt 330 is passed through the second avoidance hole and is threadedly fixed to the crankshaft 310, the crankshaft assembly also includes a pulley bolt gasket 340 and a crankshaft sprocket 360, the pulley bolt 330 includes a bolt head and a bolt rod, the bolt rod passes through the pulley 320, the pulley bolt gasket 340, and the crankshaft sprocket 360 in sequence along the axial direction of the crankshaft 310 and is threadedly connected to the crankshaft 310, the pulley 320, the pulley bolt gasket 340 and the crankshaft sprocket 360 are clamped between the end face of the crankshaft 310 and the bolt head, the crankshaft sprocket 360 is passed through the second avoidance hole, and an oil seal structure 350 is clamped between the crankshaft sprocket 360 and the inner circumference of the second avoidance hole. The second transition plug-in 520 is interference fit with the crankshaft sleeve 510, and an elastic steel sheet 480 is sandwiched between the second transition plug-in 520 and the crankshaft sleeve 510, thereby ensuring the coaxiality of the second transition plug-in 520 and the crankshaft sleeve 510. The second mounting rod 540 is provided with a threaded structure at both axial ends, one end of which is threadedly connected to the second transition plug-in 520, and the other end is threadedly connected to the second handle 550.

[0064] Optionally, the measuring device further includes a piston position sensor 610 and a connecting sleeve 620, the connecting sleeve 620 is threadedly connected to the cylinder head 630, and the piston position sensor 610 is inserted into the connecting sleeve 620. Specifically, the connecting sleeve 620 includes a third plug-in portion 621, a third abutting portion 622 and a clamping portion 623, the third plug-in portion 621 is threadedly connected to the cylinder head 630, the third abutting portion 622 abuts against the end surface of the cylinder head 630, and then the connecting sleeve 620 is straightened, and the piston position sensor 610 is inserted into the clamping portion 623 to be fixed.

[0065] Optionally, a data acquisition system 700 is also included, and the data acquisition system 700 is communicatively connected with the piston position sensor 610 , the first encoder 440 and the second encoder 530 .

[0066] Optionally, a dynamometer and a transmission shaft are further included, and the dynamometer is connected to the crankshaft 310 through the transmission shaft. Specifically, when performing a phase test, it is necessary to measure the static value and the dynamic value respectively. When measuring the static value, the dynamometer is idle, and the crankshaft 310 and the camshaft 110 are both in a stagnant state for measurement. After obtaining relevant data, the dynamometer is started, and the dynamometer drives the crankshaft 310 to rotate through the transmission shaft, and the crankshaft 310 further drives the camshaft 110 to rotate, and the first encoder 440 and the second encoder 530 rotate accordingly to obtain a dynamic value.

[0067] like Figure 5As shown, in this embodiment, the engine is a five-shaft engine, including a crankshaft 310, four camshafts 110 and three idler wheels. The four camshafts 110 are recorded as a left intake camshaft 111, a left exhaust camshaft 112, a right intake camshaft 113 and a right exhaust camshaft 114, and the sleeve of the left intake camshaft 111 is provided with a left intake sprocket 131, the sleeve of the left exhaust camshaft 112 is provided with a left exhaust sprocket 132, the sleeve of the right intake camshaft 113 is provided with a right intake sprocket 133, and the sleeve of the right exhaust camshaft 114 is provided with a right exhaust sprocket 134; the three idler wheels are respectively recorded as a left idler wheel 151, a right idler wheel 152 and a middle idler wheel 153. The left intake camshaft 111, the left exhaust camshaft 112 and the left idler wheel 151 are located on the left side of the crankshaft 310, arranged in a triangle and driven by the left chain 141; the right intake camshaft 113, the right exhaust camshaft 114 and the right idler wheel 152 are located on the right side of the crankshaft 310, the right intake sprocket 133, the right exhaust sprocket 134 and the right idler wheel 152 are located on the right side of the crankshaft 310, arranged in a triangle and driven by the right chain 142; the left idler wheel 151, the right idler wheel 152 and the crankshaft sprocket 360 are arranged in a triangle and driven by the middle chain 143, the middle idler wheel 153 is located between the left idler wheel 151 and the right idler wheel 152 and gives a preload to the middle chain 143 between the left idler wheel 151 and the right idler wheel 152.

[0068] When the dynamometer is started, the transmission shaft drives the crankshaft 310 to rotate, and the crankshaft sprocket 360 rotates accordingly and drives the left idler wheel 151 and the right idler wheel 152 to rotate through the middle chain 143. The left idler wheel 151 drives the left intake camshaft 111 and the left exhaust camshaft 112 to rotate through the left chain 141. Similarly, the right idler wheel 152 drives the right intake camshaft 113 and the right exhaust camshaft 114 to rotate through the right chain 142. The four camshafts 110 are all equipped with a first encoder 440, which are respectively recorded as the left intake camshaft encoder 441, the left exhaust camshaft encoder 442, the right intake camshaft encoder 443 and the right exhaust camshaft encoder 444. Data can be collected from the four camshafts 110 at the same time.

[0069] like Figure 6 As shown, a measurement method is also provided. Based on the above-mentioned measurement device, the data acquisition system 700 receives the feedback signals of the first encoder 440, the second encoder 530 and the piston position sensor 610, and performs calculations. The calculation formula is as follows:

[0070] Installation phase deviation β1 = (b1-d1) + a;

[0071] Dynamic phase deviation β2 = (b2-d2) + a;

[0072] Actual phase deviation β = β1-β2;

[0073] Wherein, a is the angle deviation between the actual piston top dead center and the crankshaft 310; b1 is the angle of the installed crankshaft 310;

[0074] b2 is the angle of the dynamic crankshaft 310; d1 is the angle of the installed camshaft 110; and d2 is the angle of the dynamic camshaft 110.

[0075] The angles used are uniformly converted into the rotation angles of the crankshaft 310, the basic position of the crankshaft 310 is the theoretical 0 point, the measurement advance is "-", and the measurement lag is "+".

[0076] Furthermore, during the measurement phase, the angle deviation between the actual top dead center of the piston and the crankshaft 310 is added to the installation phase deviation and the dynamic phase deviation. In this way, the influence of the angle deviation between the actual top dead center of the piston and the crankshaft 310 can be removed from the measured data, and only the installation deviation value between the crankshaft 310 and the camshaft 110 is considered.

[0077] In this embodiment, when the first handle 470 rotates clockwise relative to the first mounting rod 450, the first handle 470 is screwed together with the first mounting rod 450; when the first mounting rod 450 rotates clockwise relative to the first transition plug-in 430, the first mounting rod 450 is screwed together with the first transition plug-in 430. When the second handle 550 rotates clockwise relative to the second mounting rod 540, the second handle 550 is screwed together with the second mounting rod 540; when the second mounting rod 540 rotates clockwise relative to the second transition plug-in 520, the second mounting rod 540 is screwed together with the second transition plug-in 520.

[0078] After the test is completed, the dynamometer is turned off, and after the crankshaft 310 and the camshaft 110 are completely still, the first handle 470 is turned clockwise, so that the first handle 470 drives the camshaft sleeve 420 to rotate relative to the camshaft bolt 120 through the first mounting rod 450 and the first transition plug-in 430, and pulls the camshaft sleeve 420 away from the camshaft bolt 120 along the axial direction of the camshaft 110. Similarly, the second handle 550 is turned clockwise, so that the second handle 550 drives the crankshaft sleeve 510 to rotate relative to the crankshaft 310 bolt through the second mounting rod 540 and the second transition plug-in 520, and pulls the crankshaft sleeve 510 away from the crankshaft 310 bolt along the axial direction of the crankshaft 310. The bolt is removed from the crankshaft 310. In this way, the measuring device is recovered from the engine.

[0079] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A measuring device for measuring a valve timing of an engine, wherein the engine comprises a camshaft assembly, wherein the camshaft assembly comprises a camshaft (110), a camshaft bolt (120) and a cover (200), wherein the camshaft bolt (120) is coaxially threadedly connected to the camshaft (110), and the cover (200) is provided with a first avoidance hole coaxial with the camshaft (110), wherein: The measuring device comprises: A transition plate (410), the transition plate (410) comprising a first plug-in portion and a first abutment portion, the first plug-in portion being plugged into the first avoidance hole, and the outer peripheral wall of the first plug-in portion abutting against the inner peripheral wall of the first avoidance hole, the first abutment portion abutting against and fixed to the end surface of the first avoidance hole on the side of the cover (200) facing away from the camshaft (110), the first plug-in portion being provided with a first plug-in hole, and the first plug-in hole being provided coaxially with the camshaft (110); A camshaft sleeve (420), wherein the camshaft sleeve (420) is provided with a first stepped hole, the first stepped hole is coaxially formed with the camshaft (110), the large diameter end of the first stepped hole is fixedly sleeved outside the camshaft bolt (120), the camshaft sleeve (420) is inserted into the first plug hole, and the outer peripheral wall of the camshaft sleeve (420) is in contact with the inner peripheral wall of the first plug hole; A first transition plug-in (430), the first transition plug-in (430) is inserted into and fixed on the small-diameter end of the first stepped hole, the first transition plug-in (430) is provided with a first mounting hole, and the first mounting hole is coaxially provided with the first stepped hole; A first encoder (440) and a first mounting rod (450), wherein the first encoder (440) is fixedly sleeved on the first mounting rod (450), and the first mounting rod (450) is inserted and fixed in the first mounting hole.

2. The measuring device according to claim 1, characterized in that The transition plate (410) and the cover (200) are fixed by means of a threaded fastener (460), and a plurality of the threaded fasteners (460) are provided and evenly distributed around the axis of the first avoidance hole.

3. The measuring device according to claim 1, characterized in that The first mounting rod (450) is threadedly connected to the first transition plug-in (430).

4. The measuring device according to claim 3, characterized in that A first handle (470) is fixedly sleeved on one side of the first mounting rod (450) away from the camshaft sleeve (420), and the first encoder (440) is located between the first handle (470) and the camshaft sleeve (420).

5. The measuring device according to claim 1, characterized in that An elastic steel sheet (480) is sandwiched between the camshaft sleeve (420) and the camshaft bolt (120), and the elastic steel sheet (480) can fill the axial gap between the camshaft sleeve (420) and the camshaft bolt (120).

6. The measuring device according to claim 1, characterized in that The engine comprises a crankshaft assembly, the crankshaft assembly comprises a crankshaft (310), a pulley (320) and a pulley bolt (330), the pulley bolt (330) is coaxially connected to the crankshaft (310) and the pulley (320) and is threadedly connected to the crankshaft (310), the crankshaft (310) is drivingly connected to the camshaft (110), and the measuring device comprises: A crankshaft sleeve (510), wherein the crankshaft sleeve (510) is provided with a second stepped hole along its axial direction, and the large-diameter end of the second stepped hole is sleeved on an end of the pulley bolt (330) facing away from the crankshaft (310); A second transition plug-in (520), the second transition plug-in (520) is plugged into and fixed to the small-diameter end of the second stepped hole, the second transition plug-in (520) is provided with a second mounting hole, and the second mounting hole is coaxially arranged with the second stepped hole; A second encoder (530) and a second mounting rod (540), wherein the second encoder (530) is fixedly sleeved on the second mounting rod (540), and the second mounting rod (540) is fixedly inserted into the second mounting hole.

7. The measuring device according to claim 6, characterized in that It also includes a piston position sensor (610) and a connecting sleeve (620), wherein the connecting sleeve (620) is threadedly connected to the cylinder cover (630), and the piston position sensor (610) is inserted into the connecting sleeve (620).

8. The measuring device according to claim 7, characterized in that It also includes a data acquisition system (700), wherein the data acquisition system (700) is communicatively connected to the piston position sensor (610), the first encoder (440) and the second encoder (530).

9. The measuring device according to claim 8, characterized in that It also includes a dynamometer and a transmission shaft, wherein the dynamometer is transmission-connected to the crankshaft (310) via the transmission shaft.

10. A measuring method, based on the measuring device according to claim 9, characterized in that: The data acquisition system (700) receives the feedback signals from the first encoder (440), the second encoder (530) and the piston position sensor (610), and performs calculations. The calculation formula is as follows: Installation phase deviation β1=(b1-d1)+a; Dynamic phase deviation β2=(b2-d2)+a; The actual phase deviation β=β1-β2; Wherein, a is the angle deviation between the actual piston top dead center and the crankshaft (310); b1 is the angle of the installed crankshaft (310); b2 is the angle of the dynamic crankshaft (310); d1 is the angle of the installed camshaft (110); and d2 is the angle of the dynamic camshaft (110).

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