Method for measuring the piston crown height of an engine

Abstract

This invention discloses a method for measuring the protrusion height of an engine piston, comprising the following steps: constructing an automatic measuring mechanism matched with field equipment, the mechanism consisting of a reference positioning component, a first measuring rod, and a piston clamping component, the first measuring rod being connected to the piston clamping component; setting multiple measuring points on a reference surface at the top of the engine block using the reference positioning component, and obtaining a reference value through data conversion; the piston clamping component fitting against the piston, and using field equipment to drive the engine to run, causing the piston clamping component and the piston to reciprocate linearly synchronously to simulate the operating state, and collecting data through the first measuring rod to complete the dynamic measurement; and automatically transmitting the measurement data to the manufacturing execution system for storage. This invention, through a dedicated automatic measuring mechanism, can improve the accuracy and efficiency of measuring the protrusion height of the installed piston, ensuring stable and excellent engine performance.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically, it relates to a method for measuring the protrusion height of an engine piston. Background Technology

[0002] In the research, development, production, and assembly of piston engines, piston protrusion height is a critical technical parameter. Its measurement accuracy directly determines the precision of the engine's compression ratio. Compression ratio, as a core performance indicator of the engine, has a decisive impact on power output, fuel economy, operational stability, and emissions. If there is a deviation in the measurement of piston protrusion height, the engine's compression ratio will deviate from the design value. This can lead to minor issues such as reduced engine power, increased fuel consumption, and engine vibration, or more serious malfunctions such as piston-cylinder head interference and valve damage, significantly reducing the engine's lifespan and reliability.

[0003] Currently, most methods for measuring piston protrusion height in the industry are traditional contact-based measurements, such as manual measurement using depth gauges, dial indicators, and specialized tooling. These methods have several inherent drawbacks: First, the measurement process relies excessively on the operator's experience and skills; manual positioning and reading are prone to human error, making it difficult to guarantee the consistency and accuracy of the measurement results. This is especially pronounced in mass production assembly lines where individual operational differences lead to measurement deviations. Second, traditional measurement methods are cumbersome and time-consuming, failing to meet the demands of modern production lines for efficient inspection, thus hindering engine assembly efficiency and increasing manufacturing costs.

[0004] Furthermore, with the continuous improvement of engine performance requirements in the automotive, aviation and other fields, higher standards have been set for the measurement accuracy of piston protrusion height, and traditional measurement methods are no longer suitable for the production and testing needs of high-precision engines.

[0005] This invention provides a method for measuring the protrusion height of an engine piston, and specifically addresses how to improve the accuracy and efficiency of measuring the protrusion height of an engine piston. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a method for measuring the protrusion height of an engine piston, with the purpose of improving the accuracy and efficiency of measuring the protrusion height of the engine piston.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a method for measuring the protrusion height of an engine piston, comprising the following steps: An automatic measuring mechanism matching the field equipment is constructed. The automatic measuring mechanism consists of a reference positioning component, a first measuring rod, and a piston clamping component, with the first measuring rod and the piston clamping component connected together. Multiple measurement points are set on the top reference surface of the engine block using the reference positioning component, and the reference value is obtained by converting the measurement data from multiple points. The piston clamping assembly is kept in contact with the piston. The engine is driven by field equipment. The piston clamping assembly and the piston reciprocate linearly in sync to simulate the engine operation. The piston protrusion height data is collected by the first measuring rod to complete the dynamic measurement of the piston protrusion height. The measurement data of the piston protrusion height is automatically transmitted to the manufacturing execution system for storage.

[0008] The piston clamping assembly is flexibly connected to the top of the piston, which can adapt to changes in the piston's state during operation and always remain in close contact with the piston.

[0009] The reference positioning component has three measurement points, and the measurement data from the three measurement points are converted to obtain the reference value of the reference surface on the top of the cylinder.

[0010] The reference positioning component includes a second measuring rod, and three second measuring rods are provided.

[0011] The second measuring rod is mounted on the base and is distributed around the outer periphery of the piston clamping assembly.

[0012] The piston clamping assembly passes through the base, and the second measuring rod is located between the base and the engine block.

[0013] The piston clamping assembly is a directional clamping structure that remains in close contact with the piston and performs reciprocating linear motion synchronously throughout the measurement process.

[0014] The piston clamping assembly applies an axial force to the piston during the measurement process, ensuring that the automatic measuring mechanism remains in contact with the top of the piston at all times.

[0015] The manufacturing execution system is the MES system for the engine production line.

[0016] The engine piston protrusion height measurement method of the present invention, by employing a dedicated automatic measurement mechanism, can improve the accuracy and efficiency of measuring the engine piston protrusion height, thereby making the engine's working performance more stable and superior. Attached Figure Description

[0017] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram showing the piston protrusion height measuring mechanism in use; Figure 2 This is a partial schematic diagram of the piston protrusion height measuring mechanism in use; The following are labeled in the diagram: 1. Power output mechanism; 2. Cylinder block; 3. First measuring rod; 4. Piston clamping assembly; 5. Base; 6. Second measuring rod; 7. Piston connecting rod assembly. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0019] It should be noted that in the following embodiments, the terms "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0020] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a method for measuring the protrusion height of an engine piston, including the following steps: S1. Build an automatic measuring mechanism that matches the field equipment. The automatic measuring mechanism consists of a reference positioning component, a first measuring rod 3 and a piston clamping component 4. One end of the first measuring rod 3 and the piston clamping component 4 are connected. S2. Multiple measurement points are set on the top reference surface of the engine block 2 using the reference positioning component, and the reference value is obtained by converting the measurement data from multiple points. S3. The piston clamping assembly 4 is in contact with the piston. The engine is driven to run by the field equipment. The piston clamping assembly 4 and the piston move back and forth in a linear motion along the axial direction in sync to simulate the engine running state. The piston protrusion height data is collected by the first measuring rod 3 to complete the dynamic measurement of the piston protrusion height. S4. The measurement data of the piston protrusion height is automatically transmitted to the manufacturing execution system for storage.

[0021] Specifically, in this embodiment of the invention, the Manufacturing Execution System (MES) is the engine production line's MES system. By creating an automatic protrusion height measuring mechanism that is matched with field equipment, the mechanism drives the engine to automatically measure the engine piston protrusion height and uploads the measurement results to the MES system in real time. This upgrades the traditional manual measurement of protrusion height to automated measurement, improving measurement efficiency and achieving a measurement speed four times faster than manual measurement.

[0022] In this embodiment of the invention, the piston clamping assembly 4 is flexibly connected to the piston top, which can adapt to the state changes during piston operation and always remain in close contact with the piston. Through this flexible connection, the piston clamping assembly 4 can adapt to the axial displacement and attitude changes generated by the piston during engine operation, thereby maintaining contact with the piston top throughout the measurement process and ensuring measurement accuracy.

[0023] In embodiments of the present invention, such as Figure 1 As shown, the automatic measurement mechanism also includes a reference positioning component, which is used to position and measure the top reference surface of the engine block 2. The reference positioning component has three measurement points, and the measurement data collected at the three measurement points are converted to obtain the reference value of the top reference surface of the cylinder block 2.

[0024] Furthermore, such as Figure 1 As shown, the reference positioning assembly includes three second measuring rods 6. The second measuring rods 6 are mounted on the base 5 and distributed around the outer periphery of the piston clamping assembly 4. The piston clamping assembly 4 passes through the base 5, and the second measuring rods 6 are located between the base 5 and the engine block 2, enabling the second measuring rods 6 to measure the height of the top reference surface of the cylinder block 2.

[0025] Before starting the piston protrusion height measurement operation, the three preset measurement points on the top reference surface of the cylinder body 2 are first detected by each of the second measuring rods 6. After collecting the height data of each point, the unified reference value of the top reference surface of the cylinder body 2 is calculated by the preset conversion algorithm, which provides a reference for the subsequent measurement of piston protrusion height.

[0026] In this embodiment of the invention, the automatic measuring mechanism is equipped with three measuring probes for the top reference surface of the cylinder 2. The device calculates the reference value of the top reference surface by measuring at three points, ensuring the accuracy of the reference value.

[0027] In step S2 above, the top reference surface of the engine block 2 is a planar reference surface defined by the design. Based on the three-point plane determination principle of plane geometry, a three-point plane fitting algorithm is used to calculate the actual height values ​​of the three measurement points. The three collected height data are substituted into the plane fitting formula to obtain the fitting plane of the top reference surface of the cylinder block 2. This fitting plane is the actual equivalent reference plane of the top reference surface of the cylinder block 2. In this embodiment of the invention, a method of simultaneously measuring the reference surface of the cylinder block 2 at multiple measurement points is used, and a more accurate reference value is obtained through comprehensive calculation by the equipment.

[0028] In this embodiment of the invention, the piston clamping assembly 4 is a directional clamping structure. During the measurement of the piston protrusion height, the piston clamping assembly 4 remains in contact with the piston and reciprocates linearly in sync with the piston. During the measurement process, the piston clamping assembly 4 applies a force along the piston axial direction to the piston, ensuring that the automatic measuring mechanism remains in contact with the top of the piston throughout the measurement process, thereby achieving continuous measurement of the piston protrusion height.

[0029] By adding a piston clamping assembly 4, during the piston protrusion height measurement process, the first measuring rod 3 can reciprocate linearly by closely adhering to the top of the piston through the piston clamping assembly 4, simulating the engine operating state to achieve dynamic measurement and ensuring the accuracy of the engine piston protrusion height measurement.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for measuring the protrusion height of an engine piston, characterized in that, Includes the following steps: An automatic measuring mechanism matching the field equipment is constructed. The automatic measuring mechanism consists of a reference positioning component, a first measuring rod, and a piston clamping component, with the first measuring rod and the piston clamping component connected together. Multiple measurement points are set on the top reference surface of the engine block using the reference positioning component, and the reference value is obtained by converting the measurement data from multiple points. The piston clamping assembly is kept in contact with the piston. The engine is driven by field equipment. The piston clamping assembly and the piston reciprocate linearly in sync to simulate the engine operation. The piston protrusion height data is collected by the first measuring rod to complete the dynamic measurement of the piston protrusion height. The measurement data of the piston protrusion height is automatically transmitted to the manufacturing execution system for storage.

2. The method for measuring the protrusion height of an engine piston according to claim 1, characterized in that, The piston clamping assembly is flexibly connected to the top of the piston, which can adapt to changes in the piston's state during operation and always remain in close contact with the piston.

3. The method for measuring the protrusion height of an engine piston according to claim 1, characterized in that, The reference positioning component has three measurement points, and the measurement data from the three measurement points are converted to obtain the reference value of the reference surface on the top of the cylinder.

4. The method for measuring the protrusion height of an engine piston according to claim 3, characterized in that, The reference positioning component includes a second measuring rod, and three second measuring rods are provided.

5. The method for measuring the protrusion height of an engine piston according to claim 4, characterized in that, The second measuring rod is mounted on the base and is distributed around the outer periphery of the piston clamping assembly.

6. The method for measuring the protrusion height of an engine piston according to claim 5, characterized in that, The piston clamping assembly passes through the base, and the second measuring rod is located between the base and the engine block.

7. The method for measuring the protrusion height of an engine piston according to any one of claims 1 to 6, characterized in that, The piston clamping assembly is a directional clamping structure that remains in close contact with the piston and performs reciprocating linear motion synchronously throughout the measurement process.

8. The method for measuring the protrusion height of an engine piston according to claim 7, characterized in that, The piston clamping assembly applies an axial force to the piston during the measurement process, ensuring that the automatic measuring mechanism remains in contact with the top of the piston at all times.

9. The method for measuring the protrusion height of an engine piston according to any one of claims 1 to 8, wherein the manufacturing execution system is the MES system of an engine production line.

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