Measuring tool for detecting end face distance of camshaft

Abstract

The utility model provides a measuring tool for detecting the end face distance of a camshaft, which can directly detect the end face distance of the camshaft on line after a camshaft body is clamped in place and ground, is high in detection efficiency, does not need to clamp the camshaft for the second time, enables the processing efficiency of the camshaft to be high, and improves the yield. The gauge comprises a gauge body which is a sleeve mechanism; the dial indicator comprises a gauge stand, a measuring gauge and a measuring telescopic head; the measuring assembly comprises a core and a measuring block, the core comprises a lantern ring and a back plate, the lantern ring is arranged on the front end face of the back plate, the measuring block protruding backwards is arranged in the center of the back end face of the back plate, and a taper angle profiling surface profiling the tail end conical surface of the camshaft to be measured is arranged on the inner circumference of the front end of the lantern ring; and the positioning sleeve comprises a side convex stop ring at the front end, and the inner diameter of the positioning sleeve is equal to the outer diameter of the corresponding shaft end of the camshaft to be detected.

Description

Technical Field

[0001] This utility model relates to the technical field of camshaft measurement, specifically a measuring tool for detecting the distance between the end faces of a camshaft. Background Technology

[0002] The low fuel consumption and low emissions of diesel high-pressure common rail injection technology are of great significance for improving the current air quality. However, due to the internal pressure of its pump reaching 1800 kg, the requirements for the machining and inspection of parts are extremely stringent. Among them, the machining and inspection of the HP0 camshaft, a key component, is particularly important.

[0003] Among common rail components, the HP0 camshaft is characterized by its small size and high precision requirements. The structure of the camshaft is shown below. Figure 1 (The camshaft corresponding to the specific embodiment), where the distance between the Φ30 outer diameter end face and the 40.2±0.15mm is a detection structure that often appears during the grinding process.

[0004] Existing technologies make online inspection of the end face distance of tapered shafts difficult for operators, requiring shape measuring instruments for verification. Camshafts require grinding with a grinding wheel. The existing technology for machining the end face distance of the first camshaft piece (40.2±0.15) is cumbersome. For HP0 camshafts, the end face distance is first machined to approximately 40.2±0.1, then cut and inspected with a shape measuring instrument. Based on the measured value, the camshaft is re-clamped and machined. This process involves repeated positioning, clamping, machining, assembly / disassembly, and inspection. The initial machining dimension of 40.2±0.15 for HP0 camshafts requires grinding machine precision. If the shape measuring instrument fails the inspection, secondary positioning, clamping, and alignment are necessary, introducing errors and causing dimensional deviations, resulting in scrap. Therefore, existing inspection methods cannot perform online inspection, leading to low inspection efficiency, low production efficiency, and a high scrap rate.

[0005] Therefore, there is an urgent need to develop a measuring tool that can reliably perform online detection of the distance between the camshaft end faces. Utility Model Content

[0006] To address the aforementioned issues, this utility model provides a measuring tool for detecting the distance between the end faces of a camshaft. After the camshaft body is clamped in place and ground, the tool directly detects the distance between the end faces of the camshaft online. This tool has high detection efficiency and eliminates the need for secondary clamping of the camshaft, thereby increasing the processing efficiency of the camshaft and improving the yield rate.

[0007] A measuring tool for detecting the distance between the end faces of a camshaft, characterized in that it comprises:

[0008] The gauge body is a sleeve mechanism;

[0009] A dial indicator, which includes a base, a measuring instrument, and a telescopic measuring head;

[0010] A measuring assembly includes a core and a measuring block. The core includes a collar and a back plate. The collar is provided on the front end face of the back plate, and a protruding measuring block is provided at the center of the rear end face of the back plate. A cone angle conforming surface, which is shaped to the end cone surface of the camshaft to be measured, is provided on the inner circumference of the front end of the collar.

[0011] And a positioning sleeve, which includes a side-convex stop ring at the front end, wherein the inner diameter of the positioning sleeve is equal to the outer diameter of the corresponding shaft end of the camshaft to be tested.

[0012] The measuring component is inserted into the inner cavity of the gauge body. A positioning sleeve is fitted into the inner cavity of the front end of the gauge body. The side protrusion stop ring of the positioning sleeve is arranged close to the front end face of the gauge body. The dial indicator base is fixedly installed at the rear end of the gauge body. The front end face of the measuring telescopic head is close to the rear end face of the measuring block.

[0013] Its further features are:

[0014] It also includes a pre-made standard block, which is made into a boss, transition shaft section and conical end part according to a set size, and the measured size of the conical end part and the boss meets the design requirements;

[0015] The outer periphery of the collar of the core is also provided with a guide hole groove, and the outer periphery of the gauge body is provided with a threaded hole. After the fastening screw passes through the threaded hole, part of the stud is located in the guide hole groove. The guide hole groove enables the core to have the function of linear movement according to the camshaft to be tested, ensuring reliable testing of camshafts of different sizes.

[0016] The back plate of the collar has a central threaded hole, the front end of the measuring block is threaded to the central threaded hole, the rear end of the measuring block is a large-diameter cylinder, and the rear end face of the large-diameter cylinder is a plane perpendicular to the measuring telescopic head, to ensure accurate and reliable detection.

[0017] The inner ring at the rear end of the gauge body is provided with an installation thread, and the outer periphery of the gauge base is fixedly fitted with an installation ring sleeve. The installation ring sleeve is fixedly fitted to the installation thread by a threaded structure and is fixedly positioned by a stop ring, which ensures that the dial indicator is fixedly and reliably.

[0018] The dial indicator base is fitted with a bushing, which is inserted into the rear end of the central through hole of the mounting ring. The mounting ring is threaded with a tightening screw, which is arranged perpendicular to the bushing and is located at the exposed rear end of the gauge body. The end of the tightening screw presses tightly against the bushing, which ensures that the dial indicator is installed securely and reliably.

[0019] It also includes a spring, and a spring guide groove is provided at the front end of the central through hole of the mounting ring sleeve. The rear end of the spring is fixed in the spring guide groove, and the front end of the spring is fixed at the corresponding position of the rear end face of the back plate, which ensures that the front end face of the measuring telescopic head is in close contact with the rear end face of the measuring block.

[0020] By employing this invention, a pre-made standard block is inserted into the positioning sleeve until the end of the cone conforms to the cone angle contour surface, thereby driving the measuring component to move along the inner cavity of the gauge body to the corresponding position. At this point, the dial indicator is at 0. Afterward, the standard block is removed, and the positioning sleeve of the measuring tool is aligned with the pre-machined camshaft still clamped on the grinding machine. Then, the camshaft is inserted into the positioning sleeve until the end of the cone of the camshaft conforms to the cone angle contour surface, thereby driving the measuring component to move along the inner cavity of the gauge body to the corresponding position. At this point, the scale displayed by the dial indicator pointer is the actual distance error between the camshaft and the standard end face. If the value is within the error range, the machining is complete. If there is a repairable error value, the machining continues on the grinding machine until the error range meets the standard. After the camshaft body is clamped in place and ground, the distance between the camshaft end faces is directly detected online. This method has high detection efficiency and eliminates the need for secondary clamping of the camshaft, resulting in high machining efficiency and improved yield. Attached Figure Description

[0021] Figure 1 This is a camshaft dimension drawing corresponding to a specific embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the measuring tool structure of this utility model (the camshaft to be measured is represented by a dashed line);

[0023] Figure 3 This is a schematic diagram of the structure of the standard block of this utility model;

[0024] Figure 4 This is a schematic diagram of the core structure of this utility model;

[0025] The names corresponding to the serial numbers in the diagram are as follows:

[0026] Positioning sleeve 1, gauge body 2, core 3, collar 31, cone angle contour surface 311, guide hole groove 312, back plate 32, center threaded hole 321, fastening screw 4, measuring block 5, spring 6, support screw 7, mounting ring sleeve 8, bushing 9, dial indicator 10, indicator base 101, measuring gauge 102, measuring telescopic head 103, standard block 11, boss 111, transition shaft section 112, cone end part 113;

[0027] Camshaft 20, end cone 21. Detailed Implementation

[0028] A measuring tool for detecting the distance between camshaft end faces, see Figures 2-4 It includes a positioning sleeve 1, a gauge body 2, a measuring component, and a dial indicator 10;

[0029] The gauge body 2 is a sleeve mechanism;

[0030] The dial indicator 10 includes a base 101, a measuring instrument 102, and a measuring telescopic head 103;

[0031] The measuring component includes a core 3 and a measuring block 5. The core 3 includes a collar 31 and a back plate 32. The front end face of the back plate 32 is provided with a collar 31, and the rear end face of the back plate 32 is provided with a rear-protruding measuring block 5. The inner circumference of the front end of the collar 31 is provided with a cone angle contour surface 311 that is modeled after the end cone surface 21 of the camshaft 20 to be measured.

[0032] The positioning sleeve 1 includes a side-convex stop ring at the front end, and the inner diameter of the positioning sleeve 1 is equal to the outer diameter of the corresponding shaft end of the camshaft 20 to be measured.

[0033] A measuring component is inserted into the inner cavity of the gauge body 2. A positioning sleeve 1 is fitted into the front inner cavity of the gauge body 2. The side protrusion stop ring of the positioning sleeve 1 is arranged close to the front end face of the gauge body 2. The gauge base 101 of the dial indicator 10 is fixedly installed at the rear end of the gauge body 2. The front end face of the measuring telescopic head 103 is close to the rear end face of the measuring block 5.

[0034] For the dimensions of the camshaft corresponding to the specific embodiment, see [link to specific embodiment]. Figure 1 The end face distance of its Φ30 outer diameter is set to 40.2±0.15mm.

[0035] In specific implementation, it also includes a pre-made standard block 11. The standard block 11 is made into a boss 111, a transition shaft section 112, and a cone end portion 113 according to the set size. The measured size of the cone end portion 113 and the boss 111 is 42mm.

[0036] In a specific embodiment, a guide groove 312 is provided on the outer periphery of the collar 31 of the core 3, and a threaded hole is provided on the outer periphery of the gauge body 2. After the fastening screw 4 passes through the threaded hole, part of the stud is located in the guide groove 312. The guide groove 312 enables the core 3 to have the function of linear movement according to the camshaft to be tested, ensuring reliable detection of camshafts 20 of different sizes.

[0037] The back plate 32 of the collar 31 has a central threaded hole 321. The front end of the measuring block 5 is threaded to the central threaded hole 321. The rear end of the measuring block 5 is a large-diameter cylinder. The rear end face of the large-diameter cylinder 5 is a plane perpendicular to the measuring telescopic head 103 to ensure accurate and reliable detection.

[0038] The inner ring at the rear end of the gauge body 2 is provided with an installation thread, and the outer periphery of the gauge base 10 is fixedly fitted with an installation ring sleeve 8. The installation ring sleeve 8 is fixedly fitted to the installation thread through a threaded structure and is fixedly positioned by a stop ring, which ensures that the dial indicator 10 is fixedly and reliably.

[0039] The dial indicator 10 has a bushing 9 on its base 101. The bushing 9 is inserted into the rear end of the central through hole of the mounting ring 8. The mounting ring 8 is threaded with a fastening screw 7. The fastening screw 7 is arranged perpendicular to the bushing 9 and is located at the exposed rear end of the gauge body 2. The end of the fastening screw 7 presses tightly against the bushing 9, which ensures that the dial indicator 10 is installed firmly and reliably.

[0040] In specific implementation, it also includes a spring 6, and a spring guide groove is provided at the front end of the central through hole of the mounting ring 8. The rear end of the spring 6 is fixed in the spring guide groove, and the front end of the spring 6 is fixed at the corresponding position of the rear end face of the back plate 32, which ensures that the front end face of the measuring telescopic head 103 is in close contact with the rear end face of the measuring block 5.

[0041] Its working principle is as follows: A pre-made standard block is inserted into the positioning sleeve until the end of the cone fits against the cone angle contour surface, thereby driving the measuring component to move along the inner cavity of the gauge body to the corresponding position. At this time, the dial indicator is at 0. Then, the standard block is removed, and the positioning sleeve of the measuring tool is aligned with the camshaft that is still clamped in the grinding machine after preliminary machining. Then, the camshaft is inserted into the positioning sleeve until the end of the cone of the camshaft fits against the cone angle contour surface, thereby driving the measuring component to move along the inner cavity of the gauge body to the corresponding position. At this time, the scale displayed by the pointer swing of the dial indicator is the actual distance error between the camshaft and the standard end face. If the value is within the error range, the machining is completed. If there is a repairable error value, the grinding machine is continued until the error range is met. After the camshaft body is clamped in place and ground, the distance between the camshaft end faces is directly detected online. Its detection efficiency is high, and there is no need to clamp the camshaft again, which makes the machining efficiency of the camshaft high and improves the yield rate.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gage for camshaft end face distance detection, characterized by, It includes: The gauge body is a sleeve mechanism; A dial indicator, which includes a base, a measuring instrument, and a telescopic measuring head; A measuring assembly includes a core and a measuring block. The core includes a collar and a back plate. The collar is provided on the front end face of the back plate, and a protruding measuring block is provided at the center of the rear end face of the back plate. A cone angle conforming surface, which is shaped to the end cone surface of the camshaft to be measured, is provided on the inner circumference of the front end of the collar. And a positioning sleeve, which includes a side-convex stop ring at the front end, wherein the inner diameter of the positioning sleeve is equal to the outer diameter of the corresponding shaft end of the camshaft to be tested. The measuring component is inserted into the inner cavity of the gauge body. A positioning sleeve is fitted into the inner cavity of the front end of the gauge body. The side protrusion stop ring of the positioning sleeve is arranged close to the front end face of the gauge body. The dial indicator base is fixedly installed at the rear end of the gauge body. The front end face of the measuring telescopic head is close to the rear end face of the measuring block.

2. The measuring tool for detecting the distance between the end faces of a camshaft according to claim 1, characterized in that: It also includes a pre-made standard block, which is made into a boss, transition shaft section and cone end part according to a set size, and the measured size of the cone end part and the boss meets the design requirements.

3. The measuring tool for detecting the distance between the end faces of a camshaft according to claim 2, characterized in that: The outer periphery of the collar of the core is also provided with a guide hole groove, and the outer periphery of the gauge body is provided with a threaded hole. After the fastening screw passes through the threaded hole, part of the stud is located in the guide hole groove.

4. The measuring tool for detecting the distance between the end faces of a camshaft according to claim 1, characterized in that: The back plate of the collar has a central threaded hole, the front end of the measuring block is threaded to the central threaded hole, the rear end of the measuring block is a large-diameter cylinder, and the rear end face of the large-diameter cylinder is a plane perpendicular to the measuring telescopic head.

5. The measuring tool for detecting the distance between the end faces of a camshaft according to claim 1, characterized in that: The inner ring at the rear end of the gauge body is provided with a mounting thread, and the outer periphery of the gauge base is fixedly fitted with a mounting ring sleeve. The mounting ring sleeve is fixedly fitted to the mounting thread by a threaded structure and is fixedly positioned by a stop.

6. The measuring tool for detecting the distance between the end faces of a camshaft according to claim 5, characterized in that: The dial indicator base is fitted with a bushing, which is inserted into the rear end of the central through hole of the mounting ring. The mounting ring is threaded with a tightening screw, which is arranged perpendicular to the bushing and is located at the exposed rear end of the gauge body. The end of the tightening screw presses tightly against the bushing.

7. The measuring tool for detecting the distance between the end faces of a camshaft according to claim 5, characterized in that: It also includes a spring, with a spring guide groove provided at the front end of the central through hole of the mounting ring sleeve, the rear end of the spring being fixed in the spring guide groove, and the front end of the spring being fixed at the corresponding position on the rear end face of the back plate.

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