Deflection angle measuring instrument for outer ring of front thrust connecting rod bearing of engine
By designing an engine front thrust connecting rod bearing outer ring deflection angle measuring instrument, the center of the bearing assembly is accurately located by using the comparison area of the pointer and scale, thus solving the problem of large measurement error in the existing technology and realizing accurate angle measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA SOUTHERN AIRLINES CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-04-14
AI Technical Summary
The lack of existing technology for accurately measuring the deflection angle of the outer ring of the engine's front thrust connecting rod bearing leads to large measurement errors, failing to meet the accuracy requirements of the manual's technical specifications.
An instrument for measuring the deflection angle of the outer ring of an engine front thrust connecting rod bearing was designed, including a pointer dial and a scale dial. The deflection angle of the bearing outer ring can be read directly through the pointer and the angle scale, and the center position of the bearing assembly can be accurately located by using the reference area.
It achieves precise quantitative measurement of the outer ring deflection angle of the engine front thrust connecting rod bearing, reducing measurement errors by several degrees and meeting the accuracy requirements of the technical specifications.
Smart Images
Figure CN224121876U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine technology, and in particular to a measuring instrument for the deflection angle of the outer ring of the front thrust connecting rod bearing of an engine. Background Technology
[0002] Because the V2500 engine's front thrust connecting rod bearing is hollow, there are currently no tools available for determining the reference point, i.e., the center of the circle, during maintenance. This leads to significant measurement errors. Secondly, even if the center were determined, the connecting rod bearing protrudes from the outer ring, making it impossible to get close enough to the outer ring plane with a commercially available protractor, resulting in substantial errors. Thirdly, even if the above problems were solved, the centerline of the grooved plane on the outer ring of the bearing still cannot be determined, as the outer ring is also hollow. Furthermore, there are currently no suitable tools to accurately locate the axis of the thrust connecting rod as a reference line; only simple positioning is possible. Even a slight deviation in the axis position can result in angular errors of several degrees. The manual's technical specification is ±5 degrees, a very small value. An error of several degrees renders the measurement meaningless, and a connecting rod that was originally qualified is reworked.
[0003] Therefore, there is an urgent need for a measuring instrument for the deflection angle of the outer ring of the engine front thrust connecting rod bearing to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to provide a measuring instrument for the outer ring deflection angle of the engine front thrust connecting rod bearing, so as to facilitate the measurement of the outer ring deflection angle of the engine front thrust connecting rod bearing.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] An engine front thrust connecting rod bearing outer ring deflection angle measuring instrument, the connecting rod bearing includes a connecting rod and a bearing assembly disposed on the connecting rod, the bearing assembly includes a bearing outer ring and a bearing, and includes a pointer dial and a scale dial;
[0007] The dial is provided with a mounting hole that passes through the dial. The pointer dial includes a mounting part and an indicating part. The mounting part and the indicating part are fixedly connected. The mounting part is rotatably disposed in the mounting hole. The indicating part is exposed on the top surface of the dial. A pointer is fixedly disposed on the periphery of the indicating part. An angle scale is provided on the top surface of the dial.
[0008] The pointer dial is provided with an observation hole that passes through the mounting part and the indicating part. The center line of the observation hole is collinear with the center line of the mounting hole. A first reference area is provided on the wall of the observation hole. The projection of the first reference area along the axial direction of the observation hole is the same as the shape and size of a portion of the inner contour of the end face of the bearing outer ring. A second reference area is provided on the outer wall of the scale. The projection of the second reference area along the axial direction of the mounting hole is the same as the shape and size of the outer contour of a portion of the end face of the connecting rod.
[0009] As an improvement to the above technical solution, the first comparison area includes two opposing first arc surfaces and two opposing second arc surfaces, which are alternately arranged along the circumference of the observation hole, and the radius of the first arc surface is greater than the radius of the second arc surface.
[0010] As an improvement to the above technical solution, the angle scale is provided on both sides of the mounting hole.
[0011] As an improvement to the above technical solution, both the pointer dial and the scale dial are made of metal.
[0012] As an improvement to the above technical solution, a spline is provided on the periphery of the indicator part.
[0013] As an improvement to the above technical solution, both the dial and the pointer dial are provided with chamfers.
[0014] As an improvement to the above technical solution, a first verification point and a second verification point are provided on the top surface of the dial, and a third verification point and a fourth verification point are provided on the top surface of the indicator. When the first verification point, the second verification point, the third verification point and the fourth verification point are collinear, the pointer points to the zero degree mark of the angle scale.
[0015] As an improvement to the above technical solution, the dial is further provided with a fifth verification point and a sixth verification point, and the pointer points along the extension direction of the straight line determined by the fifth verification point and the sixth verification point.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] This utility model relates to an engine front thrust connecting rod bearing outer ring deflection angle measuring instrument, which can accurately locate the center position of the bearing assembly. The scale has an angle and the pointer has a pointer. The deflection angle of the bearing outer ring can be read directly through the pointer and the angle scale. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the front thrust connecting rod bearing structure of the engine;
[0019] Figure 2 This is a schematic diagram of the structure of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument provided in this embodiment of the utility model. Figure 1 ;
[0020] Figure 3 This is a schematic diagram of the structure of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument provided in this embodiment of the utility model. Figure 2 ;
[0021] Figure 4 This is a schematic diagram of the structure of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument provided in this embodiment of the utility model. Figure 3 ;
[0022] Figure 5 This is a schematic diagram of the pointer dial of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument provided in this embodiment of the utility model;
[0023] Figure 6 This is a schematic diagram of the scale of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument provided in this embodiment of the utility model.
[0024] In the picture:
[0025] 1. Pointer dial; 11. Mounting part; 12. Indicator part; 121. Pointer; 122. Spline; 123. Observation hole; 1231. First reference area; 12311. First arc surface; 12312. Second arc surface; 124. Third verification point; 125. Fourth verification point; 126. Fifth verification point; 127. Sixth verification point;
[0026] 2. Dial; 21. Angle scale; 22. Mounting hole; 23. Second reference area; 231. Third arc surface; 232. First plane; 233. Second plane; 24. First calibration point; 25. Second calibration point;
[0027] 100. Connecting rod; 200. Bearing assembly; 201. Bearing outer ring; 202. Bearing. Detailed Implementation
[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0032] like Figure 2-6 As shown, this embodiment provides a measuring instrument for the deflection angle of the outer ring of the front thrust connecting rod bearing of an engine. The front thrust connecting rod of a V2500 engine includes a connecting rod 100 and a bearing assembly 200 disposed on the connecting rod 100. The bearing assembly 200 includes a bearing outer ring 201 and a bearing 202 disposed within the bearing outer ring 201, as shown. Figure 1As shown. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument includes a pointer dial 1 and a scale dial 2. The scale dial 2 is provided with a mounting hole 22 penetrating the scale dial 2. The pointer dial 1 includes a mounting part 11 and an indicating part 12, which are fixedly connected. The mounting part 11 is rotatably disposed in the mounting hole 22, that is, the mounting part 11 is inserted into the mounting hole 22 and rotatably connected to the scale dial 2. The rotation axis between the pointer dial 1 and the scale dial 2 is collinear with the axis of the mounting hole 22. The indicating part 12 is exposed on the top surface of the scale dial 2. A pointer 121 is fixedly disposed on the periphery of the indicating part 12. An angle scale 21 is provided on the top surface of the scale dial 2. The top surface of the scale dial 2 is perpendicular to the axis of the mounting hole 22, and the center of the angle scale 21 is located on the axis of the mounting hole 22. The pointer dial 1 is provided with an observation hole 123 that passes through the mounting part 11 and the indicating part 12. The center line of the observation hole 123 is collinear with the center line of the mounting hole 22. A first reference area 1231 is provided on the wall of the observation hole 123. The projection of the first reference area 1231 along the axial direction of the observation hole 123 is the same as the shape and size of a portion of the inner contour of the end face of the bearing outer ring 201. A second reference area 23 is provided on the outer wall of the scale dial 2. The projection of the second reference area 23 along the axial direction of the mounting hole 22 is the same as the shape and size of the outer contour of a portion of the end face of the connecting rod 100.
[0033] The outer surface of the dial 2 mentioned here is the outer circumferential surface connecting the top and bottom surfaces of the dial 2. The part of the connecting rod 100 mentioned here is the part of the connecting rod 100 surrounding the bearing assembly 200. The end face of the part of the connecting rod 100 is the end face of the part of the connecting rod 100 surrounding the bearing assembly 200 along the axial direction of the bearing assembly 200.
[0034] Those skilled in the art will understand that the inner contour of the end face of the bearing outer ring 201 is non-circular, and the outer contour of the end face of some structures of the connecting rod 100 is also non-circular. Only a non-circular contour on the end face of the bearing outer ring 201 can serve as a reference for aligning the observation hole 123 with the bearing outer ring 201. Only when the observation hole 123 is aligned with the bearing outer ring 201 can the position of the pointer dial 1 accurately reflect the installation position of the bearing outer ring 201. Similarly, only a non-circular outer contour on the end face of the connecting rod 100 along the axial direction of the bearing assembly 200 can serve as a reference for aligning the scale dial 2 with the connecting rod 100. Only when the scale dial 2 is aligned with the connecting rod 100 can the position of the scale dial 2 accurately reflect the position of the connecting rod 100. Furthermore, after the observation hole 123 is aligned with the inner contour of the bearing outer ring 201 and the scale 2 is aligned with the outer contour of the connecting rod 100, the relative position between the pointer 121 on the pointer dial 1 and the angle scale 21 on the scale 2 can reflect the deflection angle of the bearing outer ring 201.
[0035] It should be noted that when the position of the bearing outer ring 201 is not deflected, after the observation hole 123 is aligned with the bearing outer ring 201 and the scale 2 is aligned with the connecting rod 100, the pointer 121 points to the zero mark on the scale 2. Therefore, if the installation position of the bearing outer ring 201 is deflected, after the observation hole 123 is aligned with the bearing outer ring 201 and the scale 2 is aligned with the connecting rod 100, the mark pointed to by the pointer 121 is the deflection angle of the bearing outer ring 201.
[0036] When measuring the deflection angle of the outer ring of the engine front thrust connecting rod bearing using the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument in this embodiment, the second reference area 23 on the outer wall of the scale 2 is aligned with the outer contour of the end face of the connecting rod 100 around the bearing assembly 200 along the axial direction of the bearing assembly 200. At this time, the axis of the mounting hole 22 is collinear with the center line of the receiving hole on the connecting rod 100 used to mount the bearing assembly 200 (that is, the axis of the bearing assembly 200). The first reference area 1231 on the inner wall of the observation hole 123 is aligned with the corresponding area on the inner contour of the end face of the bearing outer ring 201. The reading of the angle scale 21 pointed to by the pointer 121 is the deflection angle of the bearing outer ring 201.
[0037] The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument provided in this embodiment can accurately locate the center position of the bearing assembly 200 by aligning the second reference area 23 on the scale 2 with the corresponding outer contour on the connecting rod 100. Furthermore, by aligning the first reference area 1231 on the observation hole 123 with the corresponding inner contour on the bearing outer ring 201, the relative position of the pointer dial 1 and the scale 2 can reflect the relative position of the bearing outer ring 201 and the connecting rod 100. The scale 2 has an angle, and the pointer dial 1 has a pointer 121. The deflection angle of the bearing outer ring 201 can be directly read through the pointer 121 and the angle scale 21.
[0038] In this embodiment, the wall of the observation hole 123 is parallel to the axis of the observation hole 123 so as to facilitate the alignment of the observation hole 123 with the inner contour of the end face of the bearing outer ring 201.
[0039] In this embodiment, the first comparison area 1231 includes two opposing first arc surfaces 12311 and two opposing second arc surfaces 12312. The first arc surfaces 12311 and the second arc surfaces 12312 are alternately arranged along the circumference of the observation hole 123, and the radius of the first arc surface 12311 is larger than the radius of the second arc surface 12312. The second comparison area 23 includes a third arc surface 231, a first plane 232, and a second plane 233. One end of the first plane 232 is connected to one end of the extension direction of the third arc surface 231, and one end of the second plane 233 is connected to the other end of the extension direction of the third arc surface 231.
[0040] Optionally, angle scales 21 are provided on both sides of the mounting hole 22, and the angle scales 21 on both sides of the mounting hole 22 have a zero-degree scale value, so that the pointer 121 can be read on both sides of the mounting hole 22.
[0041] Optionally, both the pointer dial 1 and the scale dial 2 are made of metal. Specifically, in this embodiment, stainless steel is used, which is sturdy, durable, and essentially maintenance-free.
[0042] Optionally, a spline 122 is provided on the periphery of the indicator 12 so that the operator can rotate the indicator 12 to align the observation hole 123 with the outer ring 201 of the bearing.
[0043] Optionally, both the dial 2 and the pointer dial 1 are chamfered to prevent the sharp edges of the dial 2 and the pointer dial 1 from scratching the operator.
[0044] Optionally, a first calibration point 24 and a second calibration point 25 are provided on the top surface of the dial 2, and a third calibration point 124 and a fourth calibration point 125 are provided on the top surface of the indicator 12. When the first calibration point 24, the second calibration point 25, the third calibration point 124 and the fourth calibration point 125 are collinear, the pointer 121 points to the zero degree scale of the angle scale 21.
[0045] Furthermore, the dial 2 is also equipped with a fifth calibration point 126 and a sixth calibration point 127, and the pointer 121 points along the extension direction of the straight line determined by the fifth calibration point 126 and the sixth calibration point 127. Two points determine a straight line, and the straight line passing through the fifth calibration point 126 and the sixth calibration point 127 is also the straight line determined by the fifth calibration point 126 and the sixth calibration point 127.
[0046] The first verification point 24, the second verification point 25, the third verification point 124, the fourth verification point 125, the fifth verification point 126, and the sixth verification point 127 are used to verify the measurement accuracy of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument. For example, when verifying that the first verification point 24, the second verification point 25, the third verification point 124, and the fourth verification point 125 are collinear, it is necessary to check whether the straight line containing the fifth verification point 126, the sixth verification point 127, and the pointer 121 points to the zero mark, in order to verify whether the machining accuracy of the engine front thrust connecting rod bearing outer ring deflection angle measuring instrument meets the requirements for measuring the engine front thrust connecting rod bearing outer ring deflection angle.
[0047] The working process of this utility model is as follows:
[0048] Step S1: First, align the outer contour of the dial 2 (second reference area 23) with the outer contour of the end of the connecting rod 100. Do not move the dial 2. This will allow you to locate the axial position of the receiving hole of the connecting rod 100 for mounting the bearing assembly 200.
[0049] Step S2: Rotate the pointer dial 1 to align the outline of the observation hole 123 (first reference area 1231) of the pointer dial 1 with the groove outline of the bearing outer ring 201 (inner outline of the end face of the bearing outer ring 201), and a uniform arc can be seen at the four corners.
[0050] Step S3: The scale value that pointer 121 is pointing to at this time is the deflection angle of the outer ring 201 of the bearing.
[0051] Step S4: To ensure measurement accuracy, arrange for two operators to take the measurement multiple times and take the average value.
[0052] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A measuring instrument for the deflection angle of the outer ring of a front thrust connecting rod bearing for an engine, wherein the connecting rod bearing includes a connecting rod and a bearing assembly disposed on the connecting rod, the bearing assembly including a bearing outer ring and a bearing, characterized in that, Includes both analog and graduated dials; The dial is provided with a mounting hole that passes through the dial. The pointer dial includes a mounting part and an indicating part. The mounting part and the indicating part are fixedly connected. The mounting part is rotatably disposed in the mounting hole. The indicating part is exposed on the top surface of the dial. A pointer is fixedly disposed on the periphery of the indicating part. An angle scale is provided on the top surface of the dial. The pointer dial is provided with an observation hole that passes through the mounting part and the indicating part. The center line of the observation hole is collinear with the center line of the mounting hole. A first reference area is provided on the wall of the observation hole. The projection of the first reference area along the axial direction of the observation hole is the same as the shape and size of a portion of the inner contour of the end face of the bearing outer ring. A second reference area is provided on the outer wall of the scale. The projection of the second reference area along the axial direction of the mounting hole is the same as the shape and size of the outer contour of a portion of the end face of the connecting rod.
2. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 1, characterized in that, The first comparison area includes two opposing first arc surfaces and two opposing second arc surfaces, which are alternately arranged along the circumference of the observation hole, and the radius of the first arc surface is greater than the radius of the second arc surface.
3. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 1, characterized in that, The angle scale is provided on both sides of the mounting hole.
4. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 1, characterized in that, Both the pointer dial and the scale dial are made of metal.
5. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 4, characterized in that, The periphery of the indicator is provided with splines.
6. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 4, characterized in that, Both the dial and the pointer dial have chamfers.
7. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 1, characterized in that, The dial has a first and a second calibration point on its top surface, and the indicator has a third and a fourth calibration point on its top surface. When the first, second, third, and fourth calibration points are collinear, the pointer points to the zero degree mark of the angle scale.
8. The engine front thrust connecting rod bearing outer ring deflection angle measuring instrument according to claim 7, characterized in that, The dial is also provided with a fifth check point and a sixth check point, and the pointer points along the extension direction of the straight line determined by the fifth check point and the sixth check point.