Tool for measuring diameter of chamfer in cylinder bore

Abstract

The utility model provides a kind of tooling for measuring cylinder hole inner chamfer diameter, including measuring piece, retaining sleeve, dial gauge and calibration gauge, the lower part of measuring piece has conical measuring part, and conical measuring part is used to contact and measure engine cylinder hole inner chamfer;Retaining sleeve and the upper portion of measuring piece are slidingly engaged, so that conical measuring part can be moved after contacting cylinder hole inner chamfer, retaining sleeve and measuring piece are provided with limiting piece between, limiting piece is used to limit the sliding range of measuring piece, the lower end of retaining sleeve is used to be placed in the upper end of cylinder hole inner chamfer;Dial gauge is used to measure the moving distance of measuring piece, to feedback the size deviation of cylinder hole inner chamfer;Calibration gauge is used to pre-calibrate conical measuring part in initial state.Compared with prior art, the tooling can quickly and accurately measure the actual diameter of engine cylinder hole inner chamfer, effectively improve the measuring efficiency and measuring accuracy of cylinder hole inner chamfer.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling technology, and in particular to a tooling for measuring the diameter of the inner chamfer of a cylinder bore. Background Technology

[0002] The light-duty engine produced in the machining workshop has a cylinder bore chamfer located inside the engine cylinder body and at the bottom, with a countersunk platform above the cylinder bore chamfer. The diameter of the cylinder bore chamfer requires high precision, and repeated measurements are needed during the machining process to ensure that its dimensional accuracy is achieved.

[0003] Currently, the measurement of the inner chamfer of the cylinder bore mainly relies on vernier calipers. The measurement process is manual and has a large measurement error. Moreover, due to the special location of the inner chamfer of the cylinder bore, it is very inconvenient to measure, resulting in low measurement efficiency and further amplifying the measurement error. Summary of the Invention

[0004] This utility model provides a tooling for measuring the diameter of the inner chamfer of a cylinder bore, in order to solve the technical problems of large errors and inconvenience in measuring the diameter of the inner chamfer of a cylinder bore.

[0005] This utility model provides a tooling for measuring the diameter of the inner chamfer of a cylinder bore, comprising: The measuring element has a tapered measuring section at its lower part, which is used to make chamfered contact with and measure the inside of the engine cylinder bore. A retaining sleeve is provided, which slides with the upper part of the measuring element so that the tapered measuring part can move after contacting the inner chamfer of the cylinder bore. A limiting element is provided between the retaining sleeve and the measuring element to limit the sliding range of the measuring element. The lower end of the retaining sleeve is used to be placed on the upper end of the inner chamfer of the cylinder bore. A dial indicator, used to measure the movement distance of the measuring element to provide feedback on the dimensional deviation of the chamfer inside the cylinder bore; A calibration gauge is used to pre-calibrate the tapered measuring section to its initial state.

[0006] In one embodiment of the present invention, the measuring element has a central rod in the middle, the retaining sleeve has a through hole through which the central rod slides and extends, the dial indicator is fixed to the outside of the retaining sleeve, and the measuring head of the dial indicator abuts against the end of the central rod.

[0007] In one embodiment of the present invention, the lower part of the retaining sleeve has an upper part that extends into and slides into a receiving cavity for accommodating the measuring element, and the upper part of the measuring element is provided with a limiting groove along its center line direction. The limiting member extends into the limiting groove to limit the sliding range of the measuring element along the retaining sleeve.

[0008] In one embodiment of the present invention, the limiting member includes a limiting screw and a spring washer. The retaining sleeve has a threaded hole that extends into the receiving cavity. The limiting screw extends into the threaded hole, and the spring washer is placed outside the threaded hole. The limiting screw is located in the limiting groove to limit the sliding range of the measuring member.

[0009] In one embodiment of the present invention, a return spring is sleeved on the central rod, one side of the return spring abuts against the retaining sleeve, and the other side of the return spring abuts against the measuring element. The return spring is used to automatically return the conical measuring part to its original position.

[0010] In one embodiment of the present invention, the upper end of the calibration gauge is used to place the retaining sleeve, and the calibration gauge has an inner calibration chamfer inside, which is used to contact the tapered measuring part to adjust the initial state of the measuring part.

[0011] In one embodiment of this utility model, the sliding fit tolerance between the receiving cavity of the retaining sleeve and the upper part of the measuring element is H7 / g6, and the tolerance grade inside the calibration gauge is <IT6.

[0012] In one embodiment of the present invention, a dial indicator base is installed on the upper part of the retaining sleeve, the dial indicator base has a U-shaped mounting hole, and one end of the dial indicator is fixed in the mounting hole.

[0013] In one embodiment of this utility model, the dial indicator and the dial gauge, as well as the dial indicator and the retaining sleeve, are fixedly connected by locking bolts.

[0014] In one embodiment of this utility model, the return spring is made of silicon manganese spring steel, and the measuring element is made of alloy tool steel.

[0015] The beneficial effects of this utility model are as follows: This utility model proposes a fixture for measuring the diameter of the chamfer inside a cylinder bore. Before use, the tapered measuring part of the measuring component is first placed in the calibration gauge, ensuring the ground surface of the measuring sleeve is in contact with the top surface of the calibration gauge. The dial indicator is adjusted to zero, placing the tapered measuring part in its initial state. After calibration, the fixture is placed into the engine cylinder to be measured, and the tapered measuring part is placed inside the cylinder bore, contacting the chamfer. At this time, the tapered measuring part will slide within the retaining sleeve according to the actual size of the chamfer diameter, causing the dial indicator pointer to move. The difference between the actual and theoretical chamfer size can be read from the value displayed on the dial indicator. After measurement, the fixture can be returned to the calibration gauge for future use. Compared with existing technologies, this fixture can quickly and accurately measure the actual diameter of the chamfer inside an engine cylinder bore, completely avoiding the problems of large errors and low efficiency associated with manual measurement using vernier calipers, effectively improving the measurement efficiency and accuracy of the chamfer inside the cylinder bore. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of a tooling for measuring the diameter of the inner chamfer of a cylinder bore, as an example of this utility model. Figure 2 This is a schematic diagram illustrating the usage state of a tooling for measuring the inner chamfer diameter of a cylinder bore, as an example of this utility model.

[0018] The attached figures are labeled as follows: Measuring component 10, tapered measuring part 11, center rod 12, return spring 13, limit groove 14, retaining sleeve 20, receiving cavity 21, screw hole 22, limit screw 23, spring washer 24, calibration gauge 30, calibration inner chamfer 31, dial indicator 40, gauge base 41, mounting hole 42, locking bolt 43, engine cylinder block 50, cylinder bore inner chamfer 51. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0022] The specific structure of a tooling for measuring the inner chamfer diameter of a cylinder bore in this utility model is described in conjunction with [reference needed]. Figures 1 to 2 The tooling for measuring the inner chamfer diameter of a cylinder bore includes: Measuring element 10, the lower part of which has a tapered measuring part 11, the tapered measuring part 11 being used to contact and measure the chamfer 51 inside the engine cylinder bore; A retaining sleeve 20 is provided, which slides in conjunction with the upper part of the measuring element 10 to allow the tapered measuring part 11 to move after contacting the chamfer 51 inside the cylinder bore. A limiting member is provided between the retaining sleeve 20 and the measuring element 10 to limit the sliding range of the measuring element 10. The lower end of the retaining sleeve 20 is used to place... Dial indicator 40 is used to measure the movement distance of the measuring element 10 to provide feedback on the dimensional deviation of the inner chamfer 51 of the cylinder bore. Calibration gauge 30 is used to pre-calibrate the tapered measuring part 11 to its initial state.

[0023] The dial indicator 40 can be pressed against a certain position of the measuring piece 10. When the measuring piece 10 is in its initial state, i.e., the scale of the dial indicator 40 is 0, the dial indicator 40 swings as the measuring piece 10 moves during the use of this fixture, thereby recording the diameter deviation of the inner chamfer 51 of the cylinder bore. The calibration gauge 30 has a calibration inner chamfer 31. When the retaining sleeve 20 and the measuring piece 10 are placed in the calibration gauge 30, the measuring piece 10 directly returns to its initial state.

[0024] The working process of this tooling is as follows: 1. Calibration: Place the measuring piece 10 into the calibration gauge 30, such as... Figure 1 As shown, the retaining sleeve 20 is placed on the calibration gauge 30, and the bottom surface of the retaining sleeve 20 is in close contact with the top surface of the calibration gauge 30. The conical measuring part 11 will enter the calibration gauge 30 and come into contact with the inside of the calibration gauge 30. At this time, the dial of the dial indicator 40 is set to zero to complete the calibration.

[0025] 2. Measurement: After calibration, place this fixture onto the engine block 50 to be tested, such as... Figure 2 As shown, the retaining sleeve 20 is placed above the chamfer 51 inside the cylinder bore, and the tapered measuring part 11 will contact the chamfer 51 inside the cylinder bore; after the measuring part 10 is in a stable position, that is, after the tapered measuring part 11 contacts the chamfer 51 inside the cylinder bore and no longer slides, the measurement is completed.

[0026] 3. Reading: Since the measuring part 10 is slidably connected in the retaining sleeve 20, if the inner chamfer 51 of the cylinder bore is too small, it will push the measuring part 10 upward; if the inner chamfer 51 of the cylinder bore is too large, it will cause the measuring part 10 to fall downward. After the measurement is completed, the conical measuring part 11 will feed back the actual size of the inner chamfer 51 diameter of the cylinder bore, that is, the value after the pointer of the dial indicator 40 moves. The value displayed by the dial indicator 40 is the deviation value between the actual inner chamfer 51 diameter of the cylinder bore and the theoretical diameter.

[0027] 4. Return to initial position: After measuring the chamfer 51 dimension inside the cylinder bore, place the measuring part 10 within the orientation calibration gauge 30 of this fixture. Under the action of the calibration gauge 30, the measuring part 10 will automatically return to its initial state, preparing for the next measurement. It should be noted that although the measuring part may slide when picked up without the return spring installed, the dial indicator reading is 0 in the initial state during use (it has been calibrated). Therefore, if the measuring part slides during use, it will not affect the final result.

[0028] The above method is used to measure the chamfer 51 inside the cylinder bore. The measurement process only requires picking up and placing the fixture, and then taking the reading. No extra operations or alignment are required, making the operation simple, convenient, and fast. Furthermore, it allows for rapid secondary measurements, completely overcoming the problems of low efficiency and large errors caused by vernier caliper measurements, and greatly improving the efficiency and accuracy of measuring the chamfer 51 inside the cylinder bore.

[0029] In some embodiments, the measuring element 10 has a central rod 12 at its center, the retaining sleeve 20 has a through hole through which the central rod 12 slides and extends, the dial indicator 40 is fixed to the outside of the retaining sleeve 20, and the measuring head of the dial indicator 40 abuts against the end of the central rod 12. For example, Figure 1 and Figure 2 As shown, the central rod 12 of the measuring element 10 slides within the through hole of the retaining sleeve 20. This arrangement makes the sliding of the measuring element 10 along the retaining sleeve 20 smoother, and also facilitates the direct detection of the measuring element 10 by the dial indicator 40.

[0030] In some embodiments, the lower portion of the retaining sleeve 20 has a cavity 21 for receiving and sliding the upper portion of the measuring member 10. A limiting groove 14 is provided on the upper portion of the measuring member along its centerline, and a limiting member extends into the limiting groove 14 to limit the sliding range of the measuring member 10 along the retaining sleeve 20. For example, Figure 1 and Figure 2 The setting of the limiting groove 14 shown effectively limits the sliding range of the measuring element 10 along the retaining sleeve 20, and the setting of the receiving cavity 21 further makes the sliding of the measuring element 10 along the retaining sleeve 20 stable.

[0031] In some embodiments, the limiting member includes a limiting screw 23 and a spring washer 24. The retaining sleeve 20 has a threaded hole 22 extending into the receiving cavity 21. The limiting screw 23 extends into the threaded hole 22, and the spring washer 24 is disposed outside the threaded hole 22. The limiting screw 23 is located within the limiting groove 14 to limit the sliding range of the measuring member 10. For example, Figure 1 and Figure 2 As shown, the limiting screw 23 extends into the limiting groove 14, and the length of the limiting groove 14 directly limits the sliding range of the measuring piece 10 along the retaining sleeve 20, while the spring washer 24 facilitates the stable installation of the limiting screw 23.

[0032] In some embodiments, a return spring 13 is sleeved on the central rod 12. One side of the return spring 13 abuts against the retaining sleeve 20, and the other side of the return spring 13 abuts against the measuring element 10. The return spring 13 is used to automatically return the conical measuring part 11 to its original position. For example, Figure 1 and Figure 2 As shown, the return spring 13 quickly returns the measuring element 10 to its initial state after the fixture completes the measurement, preparing it for the next measurement. Furthermore, the return spring 13 ensures that the measuring element 10 is always in its initial state, allowing the fixture to perform measurement work at any time.

[0033] In some embodiments, the upper end of the calibration gauge 30 is used to place the retaining sleeve 20, and the calibration gauge 30 has an inner calibration chamfer 31, which is used to contact the tapered measuring part 11 to adjust the initial state of the measuring part. For example, Figure 1 As shown, the inner chamfer 31 within the calibration gauge 30 enables the tapered measuring section 11 to quickly return to its initial state. The inner chamfer 31 is designed to correspond to the theoretical dimensions of the inner chamfer 51 of the cylinder bore, i.e., the theoretical dimensions of the inner chamfer 51 of the cylinder bore, with the tapered measuring section 11 in its initial state.

[0034] In some embodiments, the sliding fit tolerance between the receiving cavity 21 of the retaining sleeve 20 and the upper part of the measuring element 10 is H7 / g6, and the tolerance grade inside the calibration gauge 30 is <IT6. The retaining sleeve 20 and the measuring element 10 undergo multiple precision machining processes to achieve a sliding fit with a small clearance of H7 / g6, ensuring measurement accuracy and stability. The dimensional tolerance grade of the calibration gauge 30 is controlled below IT6 to ensure calibration and measurement accuracy. The H7 / g6 fit tolerance grade ensures a precise small-clearance sliding fit between the retaining sleeve 20 and the measuring element 10. This precision fit significantly improves measurement accuracy and stability, while ensuring smooth movement of the measuring element 10 during the measurement process and reducing measurement errors.

[0035] In some embodiments, a dial indicator 41 is mounted on the upper part of the retaining sleeve 20, the dial indicator 41 having a U-shaped mounting hole 42, and one end of the dial indicator 40 is fixed within the mounting hole 42. For example, Figure 1 and Figure 2 As shown, the base 41 facilitates the installation, adjustment, and use of the dial indicator 40. The design of the U-shaped mounting hole 42 increases the adjustability of the dial indicator 40's installation position. This flexible design allows the fixture to adjust the position of the dial indicator 40 according to different measurement needs or operating habits, improving the fixture's adaptability and ease of operation.

[0036] In some embodiments, the gauge base 41 and the dial indicator 40, as well as the gauge base 41 and the retaining sleeve 20, are fixedly connected by locking bolts 43. For example, Figure 1 and Figure 2 As shown, the locking bolt 43 enables a quick and stable fixed connection between the gauge base 41 and the dial indicator 40, and between the gauge base 41 and the retaining sleeve 20.

[0037] In some embodiments, the return spring 13 is made of silicon-manganese spring steel, and the measuring element 10 is made of alloy tool steel. Both the calibration gauge 30 and the measuring element 10 are made of 9CrWMn alloy tool steel, which is characterized by high toughness, high hardness, and excellent wear resistance. This material possesses high toughness and high hardness, enabling it to maintain good shape and dimensional stability during long-term use, thereby ensuring the long-term accuracy and reliability of the tooling. Using silicon-manganese spring steel to make the return spring 13 improves the spring's strength and durability. This material selection ensures that the return spring 13 maintains good elasticity during long-term use, thereby guaranteeing the reliable return of the measuring element 10, improving the service life of the measuring tooling, and enhancing measurement consistency.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A tooling for measuring the diameter of the inner chamfer of a cylinder bore, characterized in that: The measuring element has a tapered measuring section at its lower part, which is used to make chamfered contact with and measure the inside of the engine cylinder bore. A retaining sleeve is provided, which slides with the upper part of the measuring element so that the tapered measuring part can move after contacting the inner chamfer of the cylinder bore. A limiting element is provided between the retaining sleeve and the measuring element to limit the sliding range of the measuring element. The lower end of the retaining sleeve is used to be placed on the upper end of the inner chamfer of the cylinder bore. A dial indicator, used to measure the movement distance of the measuring element to provide feedback on the dimensional deviation of the chamfer inside the cylinder bore; A calibration gauge is used to pre-calibrate the tapered measuring section to its initial state.

2. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 1, characterized in that: The measuring element has a central rod in the middle, and the retaining sleeve has a through hole through which the central rod slides and extends. The dial indicator is fixed to the outside of the retaining sleeve, and the measuring head of the dial indicator abuts against the end of the central rod.

3. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 1, characterized in that: The lower part of the retaining sleeve has an upper part that extends into and slides into a receiving cavity to accommodate the measuring element. The upper part of the measuring element is provided with a limiting groove along its center line. The limiting member extends into the limiting groove to limit the sliding range of the measuring element along the retaining sleeve.

4. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 3, characterized in that: The limiting component includes a limiting screw and a spring washer. The retaining sleeve has a threaded hole that extends into the receiving cavity. The limiting screw extends into the threaded hole, and the spring washer is placed outside the threaded hole. The limiting screw is located in the limiting groove to limit the sliding range of the measuring component.

5. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 2, characterized in that: A return spring is fitted on the central rod. One side of the return spring abuts against the retaining sleeve, and the other side of the return spring abuts against the measuring element. The return spring is used to automatically return the conical measuring part to its original position.

6. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 1, characterized in that: The upper end of the calibration gauge is used to place the retaining sleeve. The calibration gauge has an inner calibration chamfer inside, which is used to contact the tapered measuring part to adjust the initial state of the measuring part.

7. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 3, characterized in that: The sliding fit tolerance between the receiving cavity of the retaining sleeve and the upper part of the measuring element is H7 / g6, and the tolerance grade inside the calibration gauge is <IT6.

8. A tooling for measuring the inner chamfer diameter of a cylinder bore according to any one of claims 1-7, characterized in that: A dial indicator base is mounted on the upper part of the retaining sleeve. The dial indicator base has a U-shaped mounting hole, and one end of the dial indicator is fixed in the mounting hole.

9. The tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 8, characterized in that: The dial indicator and the dial gauge, as well as the dial indicator and the retaining sleeve, are fixedly connected by locking bolts.

10. A tooling for measuring the inner chamfer diameter of a cylinder bore according to claim 5, characterized in that: The return spring is made of silicon manganese spring steel, and the measuring component is made of alloy tool steel.

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