A testing tool for detecting the symmetry of a connecting rod small end wedge bevel

Abstract

A kind of gauge for detecting connecting rod small head wedge bevel symmetry, for mechanical manufacturing field.The big base plate, small base plate is fixed on the two sides of base respectively, and the diamond pin that is adapted to the big head hole of connecting rod, the positioning mandrel that is adapted to the small head hole of connecting rod is fixed on the two sides of base, for fixing the anti-rotation pin direction of diamond pin is installed in base, and table block is placed in the side of connecting rod wedge bevel;The gauge further includes table frame and percentage indicating table;The inclination of the upper plane of base is consistent with the inclination of connecting rod wedge bevel.The utility model has the advantages of simple structure, easy to manufacture and detect and debug, and is convenient and fast for on-line detection of connecting rod wedge bevel symmetry, compared with the existing three-coordinate detection method, and its intuitive detection data is more convenient for cutter and fixture debugging during processing, quickly guides operator to adjust equipment, can effectively improve the detection efficiency of connecting rod wedge bevel symmetry, reduce the labor intensity of detection personnel, and reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, specifically a gauge for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod. Background Technology

[0002] The connecting rod plays a crucial role in the smooth operation and efficient output of the entire engine. The ends of the connecting rod piston pin bore commonly feature a wedge-shaped inclined surface structure. If the symmetry of this wedge-shaped inclined surface exceeds the tolerance range, it will reduce the overall performance of the engine, increase fuel consumption, and shorten its service life. The symmetry of the connecting rod wedge-shaped inclined surface is often measured using a coordinate measuring machine (CMM), but CMMs are usually not located with the machining equipment, causing inconvenience in measurement. Therefore, it is particularly important to develop a fixture for measuring the symmetry of the connecting rod small end wedge-shaped inclined surface. Summary of the Invention

[0003] To overcome the shortcomings of the existing technology, the purpose of this invention is to provide a gauge for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod, so as to realize rapid online detection of the symmetry of the wedge-shaped inclined surface of the small end of the connecting rod.

[0004] To achieve the above-mentioned objectives, the present invention provides a gauge for detecting the symmetry of the wedge-shaped inclined surface of a connecting rod. The large and small pads are fixed on both sides of the base, and a diamond-shaped pin that matches the large end hole of the connecting rod and a positioning mandrel that matches the small end hole of the connecting rod are fixed on both sides of the base. An anti-rotation pin for fixing the direction of the diamond-shaped pin is installed inside the base, and a calibration block is placed on one side of the wedge-shaped inclined surface of the connecting rod. The gauge also includes a gauge holder and a percentage indicator.

[0005] Furthermore, the slope of the upper plane of the base is consistent with the slope of the wedge-shaped inclined surface of the connecting rod.

[0006] Furthermore, the large pad is fixed to one side of the upper plane of the base with hexagonal head screws and conical locating pins, corresponding to the large end position of the connecting rod; the small pad is fixed to the other side of the upper plane of the base with hexagonal head screws and conical locating pins, corresponding to the small end position of the connecting rod; after the large pad and small pad are assembled with the base, the upper plane is ground flat, and the flatness is ≤0.01.

[0007] Furthermore, the diamond-shaped pin is fixed to the base with an interference fit, the positioning mandrel is fixed to the base with an interference fit, the perpendicularity of the diamond-shaped pin to the large pad is ≤0.008, and the perpendicularity of the positioning mandrel to the small pad is ≤0.008.

[0008] Furthermore, the upper part of the anti-rotation pin protrudes from the base and extends into the notch of the diamond-shaped pin.

[0009] Furthermore, the long side of the diamond-shaped pin is perpendicular to the center line connecting the large end hole and the small end hole of the connecting rod.

[0010] Furthermore, the calibration block is fixed to the base near the wedge-shaped inclined surface of the connecting rod by hexagonal head screws and conical locating pins.

[0011] Furthermore, a bushing is provided inside the hole of the meter holder, and the connecting rod of the percentage indicator is installed in the bushing and fixed with an internal hexagonal flat-end set screw, with the pointer of the percentage indicator pointing towards the calibration block.

[0012] During testing, first correctly place the connecting rod onto the large and small pads. The large and small ends of the connecting rod should be fitted onto the diamond pin and positioning mandrel, respectively, with one side of the connecting rod flush against the large and small pads. Next, place the pointer of the dial indicator on the calibration block. When the small pointer of the dial indicator is between 0 and 1, tighten the set screw and manually rotate the dial of the dial indicator until its large pointer aligns with zero. Push the pointer of the dial indicator on the wedge-shaped inclined surface of the connecting rod; the reading obtained is the height dimension of one side of the wedge-shaped inclined surface. Remove the connecting rod and repeat the above steps to test the other side of the wedge-shaped inclined surface. The difference between the two readings is the symmetry of the wedge-shaped inclined surface.

[0013] Compared with the prior art, this utility model has a simple structure, is easy to manufacture and test, and provides convenient and quick online detection of the symmetry of the connecting rod wedge-shaped inclined surface. Compared with the existing three-coordinate detection method, its intuitive detection data makes it easier to adjust the cutting tools and fixtures during processing, and quickly guides the operator to adjust the equipment. It can effectively improve the detection efficiency of the symmetry of the connecting rod wedge-shaped inclined surface, reduce the labor intensity of the inspection personnel, and reduce production costs. Attached Figure Description

[0014] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a simplified structural diagram of the connecting rod.

[0015] Figure 2 for Figure 1 Top view.

[0016] Figure 3 This is a simplified structural diagram of the present invention.

[0017] Figure 4 for Figure 3 View A after the connecting rod is rotated 10° clockwise.

[0018] Figure 5 for Figure 3 A simplified structural diagram of the diamond-shaped pin.

[0019] Figure 6 for Figure 5 Top view.

[0020] In the diagram: 1. Base; 2. Anti-rotation pin; 3. Large pad; 4. Diamond pin; 5. Small pad; 6. Locating pin; 7. Calibration block; 8. Socket head cap screw; 9. Conical locating pin; 10. Dial holder; 11. Indicator; 12. Set screw; 13. Connecting rod; 14. Large end hole; 15. Small end hole; 16. Connecting rod wedge-shaped bevel; 17. Notch. Detailed Implementation

[0021] To make the invention's objectives, technical solutions, and advantages clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the gauge for detecting the symmetry of the wedge-shaped inclined plane at the small end of a connecting rod mainly includes a base 1, an anti-rotation pin 2, a large pad 3, a diamond-shaped pin 4, a small pad 5, a positioning pin 6, a calibration block 7, a gauge holder 10, and a percentage indicator 11. This utility model is used for detecting... Figure 1 The symmetry 'a' of the connecting rod 13 shown.

[0023] Large pad 3 and small pad 5 are fixed to both sides of base 1 with hexagon socket head cap screws 8 and conical locating pins 9, respectively. During testing, the large pad 3 corresponds to the large end of connecting rod 13, and the small pad 5 corresponds to the small end of connecting rod 13. After the large pad 3 and small pad 5 are assembled with base 1, the upper surface is ground flat with a flatness of ≤0.01 to ensure the positioning accuracy of the upper and lower surfaces of connecting rod 13 on the large pad 3 and small pad 5.

[0024] The rhomboid pin 4 and the positioning mandrel 6 are fixed on both sides of the base 1. The rhomboid pin 4 is adapted to the large end hole 14 of the connecting rod 13, and the positioning mandrel 6 is adapted to the small end hole 15 of the connecting rod 13. The rhomboid pin 4 and the base 1 are fixed with an interference fit, and the positioning mandrel 6 and the base 1 are fixed with an interference fit. The perpendicularity of the rhomboid pin 4 to the large pad 3 is ≤0.008, and the perpendicularity of the positioning mandrel 6 to the small pad 5 is ≤0.008, to ensure that the large end hole 14 and the small end hole 15 of the connecting rod 13 can be correctly placed. The diamond pin 4 and the positioning mandrel 6 are inserted into the base 1 to ensure the positioning accuracy of the diamond pin 4 and the positioning mandrel 6 relative to the large end hole 14 and the small end hole 15 of the connecting rod 13. The anti-rotation pin 2 is installed in the base 1 to fix the direction of the diamond pin 4. The upper part of the anti-rotation pin 2 protrudes from the base 1 and extends into the notch 17 of the diamond pin 4 to better ensure the anti-rotation effect of the anti-rotation pin 2 on the diamond pin 4. The long side of the diamond pin 4 is perpendicular to the center line connecting the large end hole 14 and the small end hole 15 of the connecting rod 13.

[0025] The slope of the upper plane of the base 1 is consistent with the slope of the wedge-shaped inclined surface 16 of the connecting rod, which is 10°, so that the wedge-shaped inclined surface 16 of the connecting rod 13 remains horizontal when the connecting rod 13 is in the testing state, which facilitates the testing personnel.

[0026] A bushing is provided inside the hole of the meter holder 10. The connecting rod of the percentage indicator 11 is installed in the bushing and fixed with a hexagonal flat-end set screw. The pointer of the percentage indicator 11 is aligned with the calibration block 7. The calibration block 7 is fixed on the base 1 near the wedge-shaped inclined surface 16 of the connecting rod by a hexagonal cylindrical head screw 8 and a conical locating pin 9, and is used to calibrate the reading of the percentage indicator 11.

[0027] The testing steps of this utility model for the gauge used to test the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod are as follows: 1. Correctly place the connecting rod 13 onto the large pad 3 and the small pad 5. The large end hole 14 and the small end hole 15 of the connecting rod 13 are respectively fitted onto the diamond pin 4 and the positioning mandrel 6. One side of the connecting rod 13 is flush with the large pad 3 and the small pad 5.

[0028] 2. Place the pointer of the percentage indicator 11 on the calibration block 7. When the small pointer of the percentage indicator 11 is between 0 and 1, tighten the set screw 12 and manually rotate the dial of the percentage indicator 11 so that its large pointer is aligned with the zero position.

[0029] 3. Push the pointer of the percentage indicator 11 on the wedge-shaped inclined surface 16 of the connecting rod. The reading on the indicator is the height of one side of the wedge-shaped inclined surface 16 of the connecting rod.

[0030] 4. Take out the connecting rod 13 and test the connecting rod wedge-shaped inclined surface 16 on the other side according to the above steps. The difference in height values ​​read from the two indicators is the symmetry a of the connecting rod wedge-shaped inclined surface 16 relative to the F reference.

[0031] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A gauge for detecting the symmetry of the wedge-shaped inclined surface of a connecting rod small end, characterized in that: Large pad (3) and small pad (5) are fixed on both sides of the base (1). A diamond pin (4) that matches the large end hole (14) of the connecting rod (13) and a positioning spindle (6) that matches the small end hole (15) of the connecting rod (13) are fixed on both sides of the base (1). An anti-rotation pin (2) for fixing the direction of the diamond pin (4) is installed in the base (1). The calibration block (7) is placed on one side of the wedge-shaped inclined surface (16) of the connecting rod. The inspection tool also includes a gauge holder (10) and a percentage indicator (11).

2. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The slope of the upper plane of the base (1) is consistent with the slope of the wedge-shaped inclined surface (16) of the connecting rod.

3. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The large pad (3) is fixed to one side of the upper plane of the base (1) with hexagonal head screws (8) and conical locating pins (9), corresponding to the large end position of the connecting rod (13); the small pad (5) is fixed to the other side of the upper plane of the base (1) with hexagonal head screws (8) and conical locating pins (9), corresponding to the small end position of the connecting rod (13); after the large pad (3), small pad (5) and base (1) are assembled, the upper plane is ground flat, and the flatness is ≤0.

01.

4. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The rhombus pin (4) is fixed to the base (1) with an interference fit, the positioning spindle (6) is fixed to the base (1) with an interference fit, the perpendicularity of the rhombus pin (4) to the large pad (3) is ≤0.008, and the perpendicularity of the positioning spindle (6) to the small pad (5) is ≤0.

008.

5. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The upper part of the anti-rotation pin (2) protrudes from the base (1) and extends into the notch (17) of the diamond pin (4).

6. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The long side of the diamond pin (4) is perpendicular to the center line connecting the large end hole (14) and the small end hole (15) of the connecting rod (13).

7. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The calibration block (7) is fixed to the base (1) on one side near the connecting rod wedge-shaped inclined surface (16) by internal hexagonal head screws (8) and conical locating pins (9).

8. The inspection fixture for detecting the symmetry of the wedge-shaped inclined surface of the small end of a connecting rod according to claim 1, characterized in that: The hole in the meter holder (10) is provided with a bushing, and the connecting rod of the percentage indicator (11) is installed in the bushing and fixed with an internal hexagonal flat-end set screw. The pointer of the percentage indicator (11) is aligned with the calibration block (7).

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