A camshaft angle measuring instrument

Abstract

This utility model relates to a camshaft angle measuring instrument. It includes a base plate, with a detection center and a follower center at each end of the base plate for abutting the camshaft. An encoder for detecting the rotation angle is mounted on the detection center, and a positioning component is provided between the detection center and the follower center. A limiting component is provided on one side of the base plate. This invention solves the technical problem that in the prior art, camshaft cam detection is generally done manually, measuring the angle of each cam on the camshaft. However, the camshaft has a large number of cams with varying angles, and each measurement requires rotating the camshaft, resulting in low efficiency and significantly impacting accuracy due to the frequent need to re-fix the camshaft after rotation.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment, and in particular to a camshaft angle measuring instrument. Background Technology

[0002] The camshaft is a component in a piston engine, its function being to control the opening and closing of the valves. The main body of the camshaft is a cylindrical rod approximately the same length as the cylinder bank, with several cams mounted on it to drive the valves. Camshaft bearings are subjected to periodic impact loads, resulting in high contact stress and relatively high sliding speeds between the cams and tappets. Therefore, the camshaft journals and cam working surfaces need to maintain high dimensional accuracy to reduce wear, necessitating the measurement of the cam angles.

[0003] However, existing camshaft cam inspection generally involves manual operation of the inspection equipment to measure the angle of each cam on the camshaft. However, there are many cams on the camshaft with different angles, and each inspection requires rotating the camshaft. As a result, the existing manual inspection method is not only inefficient, but also has a significant impact on the inspection accuracy because the camshaft needs to be re-fixed after frequent rotation. Utility Model Content

[0004] This application provides a camshaft angle measuring instrument, which solves the technical problem that in the prior art, camshaft cam detection is generally carried out manually by operating the detection equipment to measure the angle of each cam on the camshaft. However, there are many cams on the camshaft and their angles are different. Each detection requires rotating the camshaft, which makes the existing manual detection method not only inefficient, but also greatly affects the detection accuracy because the camshaft needs to be re-fixed after frequent rotation.

[0005] The technical solutions adopted in the embodiments of this application are as follows.

[0006] A camshaft angle measuring instrument includes a base plate. At both ends of the base plate are a detection center and a follower center for abutting the camshaft. An encoder for detecting the rotation angle is mounted on the detection center. A positioning assembly is provided between the detection center and the follower center. A limiting assembly is provided on one side of the base plate. The positioning assembly includes a support assembly and a pressing assembly. The support assembly includes a support column mounted on the base plate, with two rollers at the top of the support column. The pressing assembly includes a support column, a pressing rod, a pressing block, and rollers. The pressing block is connected to the support column via a pressing spring. The limiting assembly includes a support that moves along a second guide rail. A telescopic rod with a limiting spring is mounted on the support, and a measuring seat is provided at the top of the telescopic rod.

[0007] As a further improvement to the above technical solution:

[0008] A further technical solution is as follows: the bottom end of the follower tip is provided with a fixing pin, and the follower tip slides along the first guide rail and is fixed in position by the fixing pin.

[0009] A further technical solution is that the roller of the pressing component and the rotating wheel of the support component cooperate to form a three-point positioning structure for the camshaft.

[0010] A further technical solution is as follows: the support includes a fixing part, an adjusting rod, and a translation part, wherein the adjusting rod is used to adjust the distance between the measuring seat and the positioning component.

[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0012] 1. Due to the adoption of a base plate detection center, a follower center, an encoder, and a limiting component, in this utility model, during use, the camshaft is placed into the positioning component, and the camshaft is pressed onto the support component by the pressing component. Then, the follower center is moved, and the two ends of the camshaft are positioned by the follower center and the detection center. A template hole is arranged on the side of the camshaft keyway, and a liftable tapered pin is set at the front end of the detection center. The tapered pin is inserted into the template hole to establish the angular zero position. A V-shaped measuring seat is used to measure each cam, and the encoder records the angle of rotation of the camshaft, thereby determining the angle of each cam on the camshaft relative to the zero position. In summary, this utility model has a reasonable structural design. Through the positioning component, the position of the camshaft can be limited, and the camshaft can only rotate, avoiding the need to remove the camshaft and re-fix the rotation angle when switching the cam to be tested, thereby reducing errors and improving detection accuracy. Through the cooperation of the positioning component and the limiting component, the cam to be tested can be positioned quickly and effectively, improving the measurement speed. Attached Figure Description

[0013] Figure 1 The diagram shown is a structural schematic of a camshaft angle measuring instrument disclosed in an embodiment of this utility model.

[0014] Figure 2 The diagram shows the cooperative structure of the pressing component and the supporting component of a camshaft angle measuring instrument disclosed in this embodiment of the present invention.

[0015] Figure 3 The diagram shown is a structural schematic of a limiting component of a camshaft angle measuring instrument disclosed in an embodiment of this utility model.

[0016] In the diagram: 1. Base plate; 2. Detection center; 3. Encoder; 4. Follower center; 5. First guide rail; 6. Pressing assembly; 61. Support column; 62. Pressing rod; 63. Pressing spring; 64. Pressing block; 65. Roller; 7. Support assembly; 71. Support column; 72. Rotary wheel; 8. Second guide rail; 9. Limiting assembly; 91. Support; 92. Adjusting rod; 93. Telescopic rod; 94. Limiting spring; 95. Measuring seat. Detailed Implementation

[0017] This application provides a camshaft angle measuring instrument, which solves the technical problem that in the prior art, camshaft cam detection is generally carried out manually by operating the detection equipment to measure the angle of each cam on the camshaft. However, there are many cams on the camshaft and their angles are different. Each detection requires rotating the camshaft, which makes the existing manual detection method not only inefficient, but also greatly affects the detection accuracy because the camshaft needs to be re-fixed after frequent rotation.

[0018] The technical solution in this application embodiment is to solve the above problems, and the overall idea is as follows:

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] A camshaft angle measuring instrument, such as Figure 1 , Figure 2 and Figure 3 As shown, the system includes a base plate 1, with a detection tip 2 and a follower tip 4 at each end for abutting the camshaft. The detection tip 2 is equipped with an encoder 3 for detecting the rotation angle. A positioning component is provided between the detection tip 2 and the follower tip 4. A limiting component 9 is provided on one side of the base plate 1. The positioning component includes a support component 7 and a pressing component 6. The support component 7 includes a support column 71 mounted on the base plate 1. The top of the support column 71 is equipped with two rotating wheels 72. The pressing component 6 includes a support column 61, a pressing rod 62, a pressing block 64, and a roller 65. The pressing block 64 is connected to the support column 61 through a pressing spring 63. The limiting component 9 includes a support 91 that moves along the second guide rail 8. The support 91 is equipped with a telescopic rod 93 with a limiting spring 94. The top of the telescopic rod 93 is equipped with a measuring seat 95.

[0021] The bottom of the follower tip 4 is provided with a fixing pin. The follower tip 4 slides along the first guide rail 5 and is fixed in position by the fixing pin.

[0022] The roller 65 of the pressing component 6 and the rotating wheel 72 of the supporting component 7 cooperate to form a three-point positioning structure for the camshaft.

[0023] The support 91 includes a fixing part, an adjusting rod 92, and a translation part. The adjusting rod 92 is used to adjust the distance between the measuring seat 95 and the positioning component.

[0024] The bottom end of the follower tip 4 is provided with a fixing pin. The follower tip 4 slides along the slide rail, and the fixing pin is used to fix the follower tip 4. The follower tip 4 can move along the slide rail, so that the detection tip 2 and the follower tip 4 can clamp camshafts of different lengths. The fixing pin can prevent the follower tip 4 from sliding after it is in place and maintain the clamping force.

[0025] The positioning components are at least two in number, including a support component 7 for supporting the camshaft and a pressing component 6 for confining the camshaft to the support component 7. The presence of two or more positioning components provides better support for the camshaft, and one positioning component can be fixed while the other can move along the first guide rail 5 to accommodate camshafts of different lengths. The cooperation between the support component 7 and the pressing component 6 ensures that the camshaft does not shift its position during rotation, reducing errors and improving detection accuracy.

[0026] The support assembly 7 includes a support column 71 disposed on the base plate 1. The top of the support column 71 is provided with two rotating wheels 72. The camshaft is located between the two rotating wheels 72 and abuts against the two rotating wheels 72. The arrangement of the two rotating wheels 72 can automatically limit the camshaft to the middle of the support column 71, which is convenient for positioning. The rotating wheels 72 themselves can facilitate the rotation of the camshaft and prevent wear on the surface of the camshaft.

[0027] The pressing assembly 6 includes a support column 61 mounted on the base plate 1, a pressing rod 62 at the top of the support column 61, the pressing rod 62 being inserted into the top of the support column 61, a pressing block 64 fixed at the bottom of the pressing rod 62, two rollers 65 at the bottom of the pressing block 64 abutting against the camshaft, and a pressing spring 63 on the pressing rod 62, the top of the pressing spring 63 abutting against the top of the support column 61, and the bottom of the pressing spring 63 abutting against the pressing block 64; the pressing spring 63 causes the pressing block 64 to press down, and the position of the camshaft is limited by the rollers 65 and the rotating wheel 72, so that the camshaft can only rotate.

[0028] The limiting component 9 is provided with a second guide rail 8 below it. The limiting component 9 includes a support 91, which moves along the second guide rail 8. The top of the support 91 is provided with a telescopic hole, and a telescopic rod 93 is provided in the telescopic hole. The top of the telescopic rod 93 is provided with a measuring seat 95 that cooperates with the cam of the camshaft. A limiting spring 94 is provided between the measuring seat 95 and the support 91 and is sleeved on the telescopic rod 93. The limiting spring 94 engages the measuring seat 95 with the tip of the cam of the camshaft to improve the detection accuracy.

[0029] The support 91 includes a fixed part, an adjusting rod 92, and a translation part. The translation part is located above the fixed part, and the adjusting rod 92 adjusts the distance between the translation part and the positioning component. Since the extension and retraction distance of the limiting spring 94 is limited, the adjusting rod 92 can adjust the movement of the translation part, so that the measuring seat 95 can be adjusted according to the size of the camshaft.

[0030] In this invention, during use, the camshaft is placed into the positioning assembly, and the camshaft is pressed onto the support assembly 7 by the pressing assembly 6. Then, the follower tip 4 is moved, and the two ends of the camshaft are positioned by the follower tip 4 and the detection tip 2. A template hole is arranged on the side of the camshaft keyway, and a liftable tapered pin is set at the front end of the detection tip 2. The tapered pin is inserted into the template hole to make the angular zero position. The V-shaped measuring seat 95 measures each cam, and the encoder 3 records the angle of rotation of the camshaft, thereby determining the angle of each cam on the camshaft relative to the zero position.

[0031] In summary, the present invention has a reasonable structural design. The positioning component can limit the position of the camshaft, allowing it to rotate only. This avoids the need to remove the camshaft and re-fix it when switching the cam to be tested, thereby reducing errors and improving detection accuracy. The positioning component and the limiting component 9 work together to quickly and effectively position the cam to be tested, improving measurement speed.

[0032] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0033] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A camshaft angle measuring instrument, characterized in that: The system includes a base plate (1), with a detection tip (2) and a follower tip (4) at each end for abutting the camshaft. The detection tip (2) is equipped with an encoder (3) for detecting the rotation angle. A positioning component is provided between the detection tip (2) and the follower tip (4). A limiting component (9) is provided on one side of the base plate (1). The positioning component includes a support component (7) and a pressing component (6). The support component (7) includes a support column (71) disposed on the base plate (1). The support column (71) is provided with two rotating wheels (72) at the top. The pressing assembly (6) includes a support column (61), a pressing rod (62), a pressing block (64) and a roller (65). The pressing block (64) is connected to the support column (61) through a pressing spring (63). The limiting assembly (9) includes a support (91) that moves along the second guide rail (8). The support (91) is provided with a telescopic rod (93) with a limiting spring (94). The top of the telescopic rod (93) is provided with a measuring seat (95).

2. The camshaft angle measuring instrument according to claim 1, characterized in that: The bottom end of the follower tip (4) is provided with a fixing pin, and the follower tip (4) slides along the first guide rail (5) and is fixed in position by the fixing pin.

3. The camshaft angle measuring instrument according to claim 1, characterized in that: The roller (65) of the pressing component (6) and the rotating wheel (72) of the support component (7) cooperate to form a three-point positioning structure for the camshaft.

4. The camshaft angle measuring instrument according to claim 1, characterized in that: The support (91) includes a fixing part, an adjusting rod (92) and a translation part. The adjusting rod (92) is used to adjust the distance between the measuring seat (95) and the positioning component.

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