Inner diameter measuring device

Abstract

The utility model relates to an inner diameter measuring device, which is used for measuring the inner diameter of a body to be measured, the inner diameter comprises a large-diameter section and a small-diameter section, a step surface extending towards the center is formed between the large-diameter section and the small-diameter section, and the inner side surface of the small-diameter section is an inner diameter measuring surface; the measuring body comprises a first positioning part and a second positioning part which are connected with each other, the outer diameter of the first positioning part is larger than that of the second positioning part, and the lower surface, protruding out of the second positioning part, of the first positioning part is a first matching surface which is in contact with the step surface of the body to be measured to realize axial matching positioning; the first accommodating groove and the second accommodating groove are oppositely arranged on the measuring body and extend downwards from the upper surface opening of the first positioning part to the second positioning part to expose the inner diameter measuring surface, and the bottom surfaces are positioned on the same horizontal plane; and the inner diameter measuring tool is placed in the first accommodating groove and the second accommodating groove. The device is simple in structure and convenient to use, can quickly and accurately find a measurement position, improves the measurement efficiency, and can accurately measure the required inner diameter size.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring equipment, and particularly relates to an inner diameter measuring device. Background Art

[0002] The bearings used to connect the axle to the axle box in rail transit vehicles are core components of the bogie and are installed on the axle with an interference fit on the outer surface of the axle. An oil deflector ring is installed on the bearing. The inner diameter of the oil deflector ring includes two parts: a large diameter section and a small diameter section. A step surface extending toward the center is formed at the transition between the large diameter section and the small diameter section. The inner diameter of the small diameter section of the oil deflector ring is one of the mating surfaces with the axle, and the size measurement is particularly critical. Since the inner diameter measuring surface of the small diameter section of the oil deflector ring is narrow, the operator is prone to shaking when measuring with a handheld internal diameter micrometer, and it is difficult to ensure the level, resulting in distorted measurement results. The internal diameter micrometer must be adjusted repeatedly, and the operation efficiency is low. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide an inner diameter measuring device which has a simple overall structure, is easy to operate and can accurately measure the inner diameter size.

[0004] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0005] An inner diameter measuring device is used to measure the inner diameter of a body to be measured, wherein the inner diameter of the body to be measured includes a large diameter section and a small diameter section, a step surface extending toward the center is formed between the large diameter section and the small diameter section, and the inner side surface of the small diameter section is an inner diameter measuring surface, and the measuring device includes:

[0006] The measuring body comprises a first positioning part and a second positioning part connected to each other, wherein the outer diameter of the first positioning part is greater than the outer diameter of the second positioning part, and the lower surface of the first positioning part protruding from the second positioning part is a first matching surface, which contacts with the step surface of the measured body to realize axial matching positioning;

[0007] A first accommodating groove and a second accommodating groove are arranged on the measuring body opposite to each other, the first accommodating groove and the second accommodating groove extend downward from the upper surface opening of the first positioning portion to the second positioning portion to expose the inner diameter measuring surface of the body to be measured, and the bottom surfaces of the first accommodating groove and the second accommodating groove are in the same horizontal plane;

[0008] The inner diameter measuring tool is placed in the first receiving groove and the second receiving groove.

[0009] Furthermore, the first accommodating groove and the second accommodating groove are located in the first positioning portion with a portion thereof being an outer closed structure or a laterally penetrating structure, and the portion thereof being located in the second positioning portion with a laterally penetrating structure.

[0010] Furthermore, the first accommodating groove is a fan-shaped groove, which matches the contour of the first measuring head in the inner diameter measuring tool and is used to accommodate the first measuring head; the second accommodating groove is a U-shaped groove, which matches the contour of the second measuring head in the inner diameter measuring tool and is used to accommodate the second measuring head.

[0011] Further, the circumferential dimensions of the first accommodating groove and the second accommodating groove are larger than the circumferential dimensions of the first measuring head and the second measuring head, and the first measuring head and the second measuring head can swing along the circumferential direction in the first accommodating groove and the second accommodating groove.

[0012] Furthermore, the outer diameter of the first positioning portion matches the inner diameter of the large diameter section of the body to be measured, and the outer circumferential surface of the first positioning portion is a second matching surface, which matches with the inner side surface of the large diameter section of the body to be measured to achieve radial positioning.

[0013] Furthermore, the outer diameter of the second positioning portion matches the inner diameter of the small diameter section of the measured body, and the outer circumferential surface of the second positioning portion is a third matching surface, which matches with the inner side surface of the small diameter section of the measured body to achieve radial positioning.

[0014] Furthermore, the first positioning portion and the second positioning portion have the same inner diameter.

[0015] Furthermore, the inner diameter measuring tool is an inner diameter micrometer or an inner diameter dial gauge.

[0016] Furthermore, the measuring body is integrally formed of nylon material.

[0017] Furthermore, the body to be tested is a bearing oil retaining ring.

[0018] To summarize the above, the inner diameter measuring device provided by the utility model has a simple overall structure. During measurement, it is only necessary to insert the measuring body into the body to be measured, so that the axial positioning with the body to be measured can be achieved, and the inner diameter measuring surface can be exposed at the same time. It is not only easy to use, but also the measurement personnel can quickly and accurately find the measurement position, thereby improving the measurement efficiency. In addition, the bottom surfaces of the first receiving groove and the second receiving groove can be used to support the inner diameter measuring tool, so that the inner diameter measuring tool can remain in a horizontal state during the measurement process, thereby accurately measuring the required inner diameter size, ensuring the accuracy of the data, and avoiding safety hazards of the product due to inaccurate measurement, thereby affecting driving safety.

[0019] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0021] In the attached picture:

[0022] Figure 1 This is a schematic diagram of the structure of the oil retaining ring of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the measuring device of the utility model Figure 1 ;

[0024] Figure 3 This is a schematic diagram of the structure of the measuring device of the utility model Figure 2 ;

[0025] Figure 4 It is a schematic diagram of the structure of the measuring device of the utility model after being installed with the oil retaining ring in the use state.

[0026] In the figure:

[0027] Oil retaining ring 1, large diameter section 11, small diameter section 12, step surface 13, inner diameter measuring surface 14;

[0028] Measuring body 2 , first positioning portion 21 , second positioning portion 22 , first matching surface 23 , second matching surface 24 , third matching surface 25 , first accommodating groove 3 , second accommodating groove 4 .

[0029] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1 to 4 As shown, the utility model provides an inner diameter measuring device for measuring the inner diameter of a body to be measured, the inner diameter surface of the body to be measured includes a large diameter section and a small diameter section, a step surface extending toward the center is formed at the transition between the large diameter section and the small diameter section, and the inner surface is stepped, wherein the inner surface of the small diameter section is the inner diameter measuring surface to be measured.

[0034] In this embodiment, the inner diameter size of the bearing oil retainer ring installed on the axle of the rail vehicle is measured in detail. Figure 1 As shown, the bearing oil retainer ring 1 to be measured is an overall stepped annular structure, and its inner diameter surface includes a large diameter section 11 and a small diameter section 12. A step surface 13 extending toward the center is formed at the transition between the large diameter section 11 and the small diameter section 12. The outer diameter surface of the oil retainer ring 1 also includes a large diameter section and a small diameter section, forming a stepped structure. The inner side surface of the small diameter section 12 is matched with the axle, and the inner side surface of the small diameter section 12 is the inner diameter measurement surface 14 that needs to be measured by the measuring device. The inner diameter size of the small diameter section 12 is measured by the measuring device.

[0035] Embodiment 1:

[0036] like Figures 2 to 4 As shown, in this embodiment, the measuring device includes a measuring body 2. Since the overall shape of the oil deflector ring 1 is a stepped annular structure, the measuring body 2 preferably adopts a stepped cylindrical structure that can cooperate therewith.

[0037] Specifically, the measuring body 2 includes a first positioning portion 21 and a second positioning portion 22 connected to each other, both of which are cylindrical structures, wherein the outer diameter of the first positioning portion 21 is larger than the outer diameter of the second positioning portion 22, and the lower surface of the first positioning portion 21 protruding from the second positioning portion 22 is a first mating surface 23.

[0038] During measurement, the measuring body 2 is placed as a whole inside the oil slinger 1, and the first mating surface 23 contacts and cooperates with the step surface 13 of the oil slinger 1 to realize the axial positioning of the measuring body 2 and the oil slinger 1, the first positioning portion 21 is located in the large diameter section 11, and the second positioning portion 22 is located in the small diameter section 12. The height of the first positioning portion 21 and the second positioning portion 22 can be the same as or different from the height of the corresponding large diameter section 11 and small diameter section 12 of the oil slinger 1.

[0039] The measuring body 2 has a first receiving groove 3 and a second receiving groove 4 for placing an inner diameter measuring tool (not shown in the figure). The first receiving groove 3 and the second receiving groove 4 extend downward from the opening on the upper surface of the first positioning portion 21 to the second positioning portion 22, and the inner diameter measuring surface 14 of the oil retaining ring 1 is exposed on the side of the second positioning portion 22. When measuring, the inner diameter measuring tool is directly placed on the bottom surface of the first receiving groove 3 and the second receiving groove 4.

[0040] In this embodiment, the inner diameter measuring tool preferably adopts an inner diameter micrometer, and an inner diameter percentage gauge can also be selected as needed. The inner diameter micrometer and the inner diameter percentage gauge include a first measuring head and a second measuring head, wherein the first measuring head is a fixed measuring head and the second measuring head is a movable measuring head. During measurement, the first measuring head and the second measuring head are respectively placed in the first receiving groove 3 and the second receiving groove 4, and are respectively supported on the bottom surfaces of the first receiving groove 3 and the second receiving groove 4. Because the inner diameter measuring surface 14 of the oil retaining ring 1 can be exposed on the side of the first receiving groove 3 and the second receiving groove 4, after the inner diameter measuring tool is placed in the first receiving groove 3 and the second receiving groove 4, the first measuring head and the second measuring head can respectively abut against the inner diameter measuring surface 14 to achieve the measurement of the inner diameter.

[0041] By adopting the above structure, it is only necessary to install the measuring body 2 inside the oil deflector ring 1 and place the measuring body 2 on the step surface 13 of the oil deflector ring 1 to achieve axial positioning between the measuring body 2 and the oil deflector ring 1. Moreover, since the first accommodating groove 3 and the second accommodating groove 4 can expose the inner diameter measuring surface 14 of the oil deflector ring 1, after the inner diameter measuring tool is placed in the first accommodating groove 3 and the second accommodating groove 4, the first measuring head and the second measuring head can respectively abut against the inner diameter measuring surface 14, thereby realizing the measurement of the inner diameter. The operation is simple and convenient, and the measurement efficiency can be greatly improved.

[0042] In addition, since the first receiving groove 3 and the second receiving groove 4 are both groove structures with the top open and extending downward, it is also convenient for the measurement personnel to directly place the first measuring head and the second measuring head of the inner diameter measuring tool in the first receiving groove 3 and the second receiving groove 4 from above, which is more convenient to operate.

[0043] In this embodiment, it is further preferred that the first accommodating groove 3 and the second accommodating groove 4 located at the first positioning portion 21 are of a structure with an outer side closed and an inner side open, and the part located at the second positioning portion 22 is of a laterally penetrating structure to expose the inner diameter measuring surface 14 of the oil retaining ring 1. The upper parts of the first accommodating groove 3 and the second accommodating groove 4 adopt an outer side closed structure, which can limit the initial position of the inner diameter measuring tool to be inserted downward, making it smoother to insert the inner diameter measuring tool. At the same time, the outer diameters of the upper parts of the first accommodating groove 3 and the second accommodating groove 4 form a continuous structure, which is also conducive to improving the overall structural strength of the measuring body 2 and the service life of the measuring body 2. The diameter size between the inner side surfaces of the upper parts of the first accommodating groove 3 and the second accommodating groove 4 can be equal to the inner diameter of the small diameter section 12 of the oil retaining ring 1, or it can be greater than the inner diameter of the small diameter section 12 of the oil retaining ring 1. Of course, the first accommodating groove 3 can also adopt a laterally penetrating structure to completely expose the step surface 13 below.

[0044] In this embodiment, it is further preferred that the bottom surface of the first receiving groove 3 and the second receiving groove 4 is preferably a plane and is in the same horizontal plane. In this way, when the first measuring head and the second measuring head are placed in the first receiving groove 3 and the second receiving groove 4, the first measuring head and the second measuring head can be stably installed in the first receiving groove 3 and the second receiving groove 4, and can be kept in the same horizontal plane, that is, it is ensured that the measuring heads at both ends of the internal diameter micrometer are always kept at the same height during measurement, which is convenient for the measurement personnel to quickly and accurately find the measurement position, and is conducive to fixing the first measuring head and the second measuring head at the same height during the measurement process, thereby ensuring accurate measurement of the size, ensuring the accuracy of the data, and avoiding safety hazards of the product due to inaccurate measurement, affecting driving safety.

[0045] In this embodiment, the first positioning portion 21 and the second positioning portion 22 have the same inner diameter and are the same circumferential surface, but have different outer diameters. The structure is simple and the processing accuracy is easy to control.

[0046] In this embodiment, it is also preferred that the first accommodating groove 3 is a fan-shaped groove, which matches the profile of the first measuring head and is used to accommodate the first measuring head. The second accommodating groove 4 is a U-shaped groove, which matches the profile of the second measuring head and is used to accommodate the second measuring head. In this way, it is beneficial to limit the first measuring head and the second measuring head in the circumferential direction.

[0047] In the present embodiment, it is further preferred that the circumferential dimensions of the first accommodating groove 3 and the second accommodating groove 4 are slightly larger than the circumferential dimensions of the first measuring head and the second measuring head, so that the first measuring head and the second measuring head can have a certain swing amplitude on the horizontal plane along the circumferential direction in the first accommodating groove 3 and the second accommodating groove 4, so as to facilitate finding the measuring position during measurement.

[0048] In this embodiment, it is also preferred that the outer diameter of the first positioning portion 21 matches the inner diameter of the large diameter section 11 of the oil deflector 1, and the outer circumferential surface of the first positioning portion 21 is the second mating surface 24, which cooperates with the inner side surface of the large diameter section 11 to achieve radial positioning. The outer diameter of the second positioning portion 22 matches the inner diameter of the small diameter section 12 of the oil deflector 1, and the outer circumferential surface of the second positioning portion 22 is the third mating surface 25, which cooperates with the inner side surface of the small diameter section 12 to achieve radial positioning. In this way, after the measuring body 2 is placed in the oil deflector 1, the measuring body 2 will not shake in the oil deflector 1, which is conducive to convenient measurement, and is also conducive to increasing the contact area between the first mating surface 23 of the measuring body 2 and the step surface 13 of the oil deflector 1, so that the measuring body 2 can be stabilized inside the oil deflector 1 to improve the measurement accuracy.

[0049] Among them, the height of the first positioning portion 21 can be greater than, equal to or less than the height of the large diameter section 11 of the oil deflector ring 1, that is, the top of the first positioning portion 21 can be higher than the top of the oil deflector ring 1 after installation, or it can be flush with the top of the oil deflector ring 1, or it can be located below the top of the oil deflector ring 1.

[0050] In order to facilitate placing the oil slinger 1 on the table for measurement, the height of the second positioning portion 22 can be equal to or less than the height of the small diameter section 12 of the oil slinger 1, that is, after the second positioning portion 22 is installed, its bottom end can be located above the bottom end surface of the oil slinger 1, or it can be flush with the bottom end surface, as long as the side can be exposed to the inner diameter side measuring surface 14. Of course, depending on the structure of the components, the height of the second positioning portion 22 can be greater than the height of the small diameter section 12 of the oil slinger 1, and its bottom end can also be located below the bottom end surface of the oil slinger 1 after installation.

[0051] With the above structure, different specifications of measuring devices need to be matched according to different specifications and models of the oil deflector ring 1 .

[0052] In this embodiment, it is also preferred that the measuring body 2 is integrally formed of nylon material, which can ensure the machining accuracy of the measuring body 2 and at the same time ensure that the surface of the oil deflector 1 is not damaged during measurement.

[0053] In order to facilitate taking the measuring body 2 , it is more preferred to provide upwardly protruding U-shaped handles at both ends of the upper surface of the measuring body 2 , avoiding the first accommodating groove 3 and the second accommodating groove 4 , so as to facilitate the operator to take out or put in the measuring body 2 .

[0054] The measurement steps are as follows:

[0055] 1. Select a measuring body 2 with matching size according to the specifications of the oil retaining ring 1.

[0056] 2. Install the measuring body 2 inside the oil deflector 1 so that the first matching surface 23 of the measuring body 2 is placed on the step surface 13 of the oil deflector 1 to achieve axial positioning.

[0057] 3. Place the first measuring head and the second measuring head of the inside diameter micrometer in the first receiving groove 3 and the second receiving groove 4. The first measuring head is placed in the first receiving groove 3 and the second measuring head is placed in the second receiving groove 4, and they are supported on the bottom surfaces of the first receiving groove 3 and the second receiving groove 4 respectively.

[0058] 4. Adjust the inside diameter micrometer so that the first measuring head and the second measuring head respectively abut against the inside diameter measuring surface 14 of the oil deflector ring 1.

[0059] 5. The reading from the inside micrometer is the inside diameter size of the small diameter section 12 of the oil retaining ring 1 that needs to be measured.

[0060] Embodiment 2:

[0061] The difference from the first embodiment is that, in this embodiment, the outer diameters of the first positioning portion 21 and the second positioning portion 22 of the measuring body 2 may not match the inner diameters of the corresponding large diameter section 11 and small diameter section of the oil deflector 1, that is, the outer diameters of the first positioning portion 21 and the second positioning portion 22 are both smaller than the inner diameters of the corresponding large diameter section 11 and small diameter section. It is only necessary that the outer diameter of the first positioning portion 21 be larger than the inner diameter of the small diameter section 12 of the oil deflector 1 so that the first mating surface 23 on the measuring body 2 can be placed on the step surface 13 of the oil deflector 1 to achieve axial positioning.

[0062] This can also ensure that the first accommodating groove 3 and the second accommodating groove 4 expose the inner diameter measuring surface 14, and can also ensure that the bottom surface is in the same plane, thereby ensuring the measurement accuracy. It can also be applied to the measurement of oil slinger rings 1 with different inner diameters, thereby increasing the versatility of the device, and one measuring device can be used to measure oil slinger rings 1 with different specifications and sizes.

[0063] After adopting this structure, the first accommodating groove 3 can adopt a laterally penetrating structure to completely expose the step surface 13 below, which can improve the versatility of the measuring device and also help to simplify the processing difficulty of the measuring body 2.

[0064] Embodiment three:

[0065] The difference from the first embodiment is that, in this embodiment, the measuring body 2 as a whole adopts a long cylindrical structure, and has arc surfaces matching the inner surfaces of the large diameter section 11 and the small diameter section 12 of the oil retaining ring 1 at both ends of the first positioning portion 21 and the second positioning portion 22, which are used for radial positioning with the oil retaining ring 1, and the two side surfaces of the first positioning portion 21 and the second positioning portion 22 are planes. Similarly, the first accommodating groove 3 and the second accommodating groove 4 are arranged opposite to each other on the first positioning portion 21 and the second positioning portion 22, and the first accommodating groove 3 and the second accommodating groove 4 are both opened on the upper surface of the first positioning portion 21, extending downward to the second positioning portion 22, and the inner diameter measuring surface 14 is exposed on the side, and the inner diameter measuring tool 3 is inserted into the first accommodating groove 3 and the second accommodating groove 4 to achieve the measurement of the inner diameter size.

[0066] In this embodiment, the upper half of the first accommodating groove 3 and the second accommodating groove 4 corresponding to the first positioning portion 21 is a closed structure on the outside to ensure radial positioning.

[0067] The measuring device provided by the utility model has the following advantages:

[0068] 1. The measuring device has a simple overall structure, is easy to use, has high operating efficiency, and can ensure measurement accuracy, meet the requirements for measuring the inner diameter of the oil retaining ring of the EMU bearing, and ensure the reliability of the rail vehicle EMU bearing during use.

[0069] 2. The measuring device can accurately find the measuring position and ensure that the two measuring heads of the inner diameter measuring tool always remain at the same height during the measurement process, accurately measure the size, ensure the accuracy of the data, avoid distortion of the measurement results due to errors during measurement, and cause potential safety hazards to the product and affect driving safety.

[0070] 3. This measuring device is mainly used for measuring the inner diameter of the oil retaining ring of the rail transit vehicle EMU bearing, and can also be used for measuring the inner diameter of other parts with stepped inner surfaces.

[0071] The above description is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. An inner diameter measuring device, used for measuring the inner diameter of a body to be measured, wherein the inner diameter of the body to be measured comprises a large diameter section and a small diameter section, a step surface extending toward the center is formed between the large diameter section and the small diameter section, and the inner side surface of the small diameter section is an inner diameter measuring surface, It is characterized in that The measuring device comprises: The measuring body comprises a first positioning part and a second positioning part connected to each other, wherein the outer diameter of the first positioning part is greater than the outer diameter of the second positioning part, and the lower surface of the first positioning part protruding from the second positioning part is a first matching surface, which contacts with the step surface of the measured body to realize axial matching positioning; A first accommodating groove and a second accommodating groove are arranged on the measuring body opposite to each other, the first accommodating groove and the second accommodating groove extend downward from the upper surface opening of the first positioning portion to the second positioning portion to expose the inner diameter measuring surface of the body to be measured, and the bottom surfaces of the first accommodating groove and the second accommodating groove are in the same horizontal plane; The inner diameter measuring tool is placed in the first receiving groove and the second receiving groove.

2. The inner diameter measuring device according to claim 1, Features: The first accommodating groove and the second accommodating groove are located in the first positioning portion with a closed structure on the outside or a laterally penetrating structure, and the first accommodating groove and the second accommodating groove are located in the second positioning portion with a laterally penetrating structure.

3. The inner diameter measuring device according to claim 1, Features: The first accommodating groove is a fan-shaped groove, which matches the contour of the first measuring head in the inner diameter measuring tool and is used to accommodate the first measuring head; the second accommodating groove is a U-shaped groove, which matches the contour of the second measuring head in the inner diameter measuring tool and is used to accommodate the second measuring head.

4. The inner diameter measuring device according to claim 3, Features: The sizes of the first accommodating groove and the second accommodating groove in the circumferential direction are larger than the sizes of the first measuring head and the second measuring head in the circumferential direction, and the first measuring head and the second measuring head can swing along the circumferential direction in the first accommodating groove and the second accommodating groove.

5. The inner diameter measuring device according to claim 1, Features: The outer diameter of the first positioning portion matches the inner diameter of the large diameter section of the body to be measured, and the outer circumferential surface of the first positioning portion is a second matching surface, which matches with the inner side surface of the large diameter section of the body to be measured to achieve radial positioning.

6. The inner diameter measuring device according to claim 1, Features: The outer diameter of the second positioning portion matches the inner diameter of the small diameter section of the measured body, and the outer circumferential surface of the second positioning portion is a third matching surface, which matches with the inner side surface of the small diameter section of the measured body to achieve radial positioning.

7. The inner diameter measuring device according to claim 1, Features: The first positioning portion and the second positioning portion have the same inner diameter.

8. The inner diameter measuring device according to claim 1, Features: The inner diameter measuring tool is an inner diameter micrometer or an inner diameter percentage gauge.

9. The inner diameter measuring device according to claim 1, Features: The measuring body is integrally formed of nylon material.

10. The inner diameter measuring device according to any one of claims 1 to 9, Features: The body to be tested is a bearing oil retaining ring.

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