Measuring tool

Abstract

The invention relates to the technical field of main speed reducer measurement, and discloses a measuring tool suitable for measuring a shell of a main speed reducer. The half shaft bearing simulation piece is arranged on the connecting shaft in a sleeving manner; the end cover simulation piece is arranged on the connecting shaft in a sleeving manner; the test piece is connected with the connecting shaft, the test piece is provided with a reading display part and a test part, the test part is movably arranged along a first direction, the first direction is perpendicular to the axial direction of the connecting shaft, the reading display part is connected with the test part, and the reading display part is arranged on a projection plane perpendicular to the connecting shaft. The orthographic projection of the reading display part is higher than the orthographic projection of the end cover simulation piece and / or the orthographic projection of the half-shaft bearing simulation piece; and the driving gear bearing simulation piece abuts against the lower end of the test part. The measuring tool is simple in structure, short in testing time and suitable for measurement in the small-batch and medium-batch shell production process.

Description

Technical Field

[0001] This invention relates to the field of main reducer housing measurement technology, and specifically to a measuring fixture. Background Technology

[0002] As a core component of a vehicle, the main reducer has a significant impact on vehicle performance. Since manufacturing errors in the main reducer housing can affect the meshing effect between the drive gear and the driven gear, the housing needs to be tested to determine its quality. Among these tests, the installation distance between the central axis of the half-shaft and the bottom surface of the drive gear bearing is an important indicator for judging whether the housing is qualified.

[0003] In related technologies, when the number of housings produced is small, the above-mentioned installation distance is mainly measured by a coordinate measuring machine. The measurement results are relatively accurate and reliable, but the measurement time for each housing is relatively long. When the number of housings produced is large, an automated testing platform composed of sensors, a standard platform and a computer system is mainly used to measure the above-mentioned installation distance. This can reduce the measurement time for each housing. However, the automated testing platform has a complex structure and high investment cost. It is suitable for mass standardized production, but it is difficult to control costs for small and medium batch production. Summary of the Invention

[0004] This invention provides a measuring fixture to solve the problem that in the production process of small-batch and medium-batch main reducer housings in the prior art, it is impossible to balance measurement cost and measurement time when measuring the housing.

[0005] This invention provides a measuring fixture suitable for measuring the housing of a main reducer. The measuring fixture includes: a connecting shaft; a half-shaft bearing simulation component fitted onto the connecting shaft; an end cap simulation component fitted onto the connecting shaft; a test component connected to the connecting shaft, the test component having a reading display section and a testing section, the testing section being movably disposed along a first direction perpendicular to the axial direction of the connecting shaft, the reading display section being connected to the testing section, and on a projection plane perpendicular to the connecting shaft, the orthographic projection of the reading display section being higher than the orthographic projection of the end cap simulation component and / or the orthographic projection of the half-shaft bearing simulation component; and a drive gear bearing simulation component abutting against the lower end of the testing section.

[0006] Beneficial effects: The measuring fixture can quickly determine the installation distance between the central axis of the upper half shaft of the housing under test and the bottom surface of the bearing of the drive gear. It has low cost, simple operation, short test time and reliable test results. The measuring fixture is suitable for the production process of small and medium batch housings, achieving the goal of balancing measurement cost and measurement time.

[0007] In one optional embodiment, the measuring fixture further includes a calibration assembly, which includes a base plate, a standard bearing support arm, and a standard end cap support arm. The standard bearing support arm and the standard end cap support arm are both connected to the base plate. The standard bearing support arm is adapted to support the half-shaft bearing simulator, the standard end cap support arm is adapted to support the end cap simulator, and the base plate is adapted to support the drive gear bearing simulator.

[0008] Beneficial effects: The measuring fixture includes calibration components, which can calibrate test pieces without the need for additional standard housings, reducing calibration difficulty and simplifying the structure.

[0009] In one optional embodiment, the half-shaft bearing simulation component includes: a first ring portion sleeved on the connecting shaft; and a second ring portion sleeved on the connecting shaft, wherein the second ring portion and the first ring portion are connected and arranged along the axial direction of the connecting shaft, and the outer diameter of the second ring portion is smaller than the outer diameter of the first ring portion.

[0010] Beneficial effects: By fitting both the first and second rings onto the connecting shaft, the contact area between the axle bearing simulator and the connecting shaft is increased, which helps ensure the positioning reliability between the axle bearing simulator and the connecting shaft. The structural strength of the axle bearing simulator can be increased, reducing the probability of damage. Furthermore, because the outer diameter of the second ring is smaller, the volume and weight of the axle bearing simulator can be reduced, lowering costs.

[0011] In one optional embodiment, the end cap simulation component includes: a third ring portion sleeved on the connecting shaft; and an arc-shaped portion connected to the outer peripheral surface of the third ring portion, the arc-shaped portion having an arc-shaped surface, the central angle corresponding to the arc-shaped surface being A, 180°≤A<360°, and on a projection plane perpendicular to the connecting shaft, the orthographic projection of the reading display portion is higher than the orthographic projection of the end cap simulation component.

[0012] Beneficial effects: The third ring ensures a sufficiently large contact area between the end cap simulator and the connecting shaft, resulting in more reliable positioning between them. The arc-shaped portion effectively supports the end cap simulator on the end cap mounting holes of the housing, reducing its size and weight while still allowing for housing measurements, thus lowering costs. Furthermore, the end cap simulator does not obstruct the reading display, and the large gap between its upper surface and the housing facilitates operator observation of the readings, enabling easier measurement of the housing.

[0013] In one alternative embodiment, the arcuate portion has a slope formed on the upper surface of the arcuate portion, the slope connecting the arcuate surface and the outer peripheral surface of the third ring portion, and the height of the slope gradually increases in the direction away from the third ring portion.

[0014] Beneficial effects: On the one hand, it can increase the arc length of the curved surface, which increases the contact area between the end cap simulator and the calibration component during the calibration stage, resulting in better positioning between the end plate simulator and the calibration component and improving calibration reliability. On the other hand, it increases the contact area between the end cap simulator and the shell under test, resulting in better positioning between the end plate simulator and the shell under test and improving measurement reliability.

[0015] In one alternative embodiment, the thickness of the third ring portion is greater than the thickness of the arc-shaped portion.

[0016] Beneficial effects: Increasing the thickness of the third ring increases the contact area between the third ring and the connecting shaft, which helps ensure the positioning reliability between the third ring and the connecting shaft, increases the structural strength of the third ring, and reduces the probability of damage to the end cap simulator. Furthermore, because the arc-shaped portion has a larger cross-sectional area, setting its thickness to be smaller effectively reduces the volume and weight of the end cap simulator, thus lowering costs.

[0017] In one alternative embodiment, the end cap simulator is provided with weight-reduction holes.

[0018] Beneficial effects: It can further reduce the size and weight of the end cap simulation part, and reduce costs.

[0019] In one alternative embodiment, the connecting shaft has a plane of symmetry, the central axis of the connecting shaft is located on the plane of symmetry, and the plane of symmetry is parallel to the first direction; the half-shaft bearing simulator is symmetrically arranged with respect to the plane of symmetry, and / or, the end cap simulator is symmetrically arranged with respect to the plane of symmetry.

[0020] Beneficial effects: The measuring fixture has a more uniform weight distribution, which can prevent rotation due to uneven weight distribution during the calibration and measurement stages, thus improving the accuracy of calibration and measurement.

[0021] In one optional embodiment, the test piece further includes: a fixing frame connected to the connecting shaft; a sleeve connected to the fixing frame, wherein the test part is movably disposed within the sleeve along the first direction, and the upper end of the sleeve is connected to the reading display part.

[0022] Beneficial effects: By setting a fixing bracket, the relative position of the test piece and the connecting shaft can be fixed, and the sleeve can fix the reading display part and the test part. The reading display part will not shake or move relative to the connecting shaft, ensuring convenient reading. It can also realize the relative movement of the test part and the connecting shaft. The test part can test the installation distance between the central axis of the upper half shaft of the housing under test and the bottom surface of the bearing of the drive gear.

[0023] In one optional embodiment, the active gear bearing simulator includes: a first segment that abuts against the test section; a second segment whose upper end is connected to the lower end of the first segment, and the diameter of the second segment is smaller than the diameter of the first segment; and a third segment whose upper end is connected to the lower end of the second segment, and the diameter of the second segment is smaller than the diameter of the third segment.

[0024] Beneficial effects: The first and third segments can simulate the bearings on the drive gear, and can be positioned with the drive gear mounting holes on the housing. By setting the diameter of the second segment to be smaller, the relative position between the first and third segments can be fixed while reducing the weight of the drive gear bearing simulator, making it easier to fit the simulator with the calibration components and the housing under test. Furthermore, the second segment is easier for the operator to hold, making it more convenient for the operator to move the drive gear bearing simulator. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the measuring fixture according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the axle bearing simulation component according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a simulated half-shaft bearing according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the end cap simulation component according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the end cap simulation component according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the calibration component according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a standard bearing support arm according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a standard end cap support arm according to an embodiment of the present invention; Figure 9 This is a cross-sectional view of the housing according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Measuring fixture; 2. Housing; 21. Bearing mounting hole; 22. End cover mounting hole; 23. Drive gear mounting hole; 100. Connecting shaft; 110. Bearing section; 120. Intermediate section; 130. End cap section; 140. Groove; 200. Simulated half-shaft bearing component; 210. First ring section; 220. Second ring section; 300. End cap simulation part; 310. Third ring part; 320. Arc-shaped part; 321. Arc-shaped surface; 322. Inclined surface; 330. Weight reduction hole; 340. First wall body; 350. Second wall body; 400. Test piece; 410. Reading display unit; 420. Test unit; 430. Fixture; 440. Sleeve; 500. Simulated drive gear bearing; 510. First section; 520. Second section; 530. Third section; 600, Calibration component; 610, Base plate; 620, Standard bearing support arm; 621, Bearing support groove; 622, First mounting hole; 623, First fixing hole; 630, Standard end cap support arm; 631, End cap support groove; 632, Second mounting hole; 633, Second fixing hole; 640, First support plate; 650, Second support plate; 660, First limiting component; 670, Second limiting component. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, 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 the actual implementation. In the 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.

[0031] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, a measuring fixture 1 is provided, which is adapted to measure the housing 2 of the main reducer.

[0033] The measuring fixture 1 includes a connecting shaft 100, a half-shaft bearing simulation component 200, an end cover simulation component 300, a test component 400, and a drive gear bearing simulation component 500.

[0034] A half-shaft bearing simulation component 200 is sleeved on the connecting shaft 100, an end cap simulation component 300 is sleeved on the connecting shaft 100, a test component 400 is connected to the connecting shaft 100, and the test component 400 is provided with a reading display unit 410 and a test unit 420. The test unit 420 is movably arranged along a first direction, which is perpendicular to the axial direction of the connecting shaft 100. The reading display unit 410 is connected to the test unit 420. On a projection plane perpendicular to the connecting shaft 100, the orthographic projection of the reading display unit 410 is higher than the orthographic projection of the end cap simulation component 300 and / or the orthographic projection of the half-shaft bearing simulation component 200. The drive gear bearing simulation component 500 abuts against the lower end of the test unit 420.

[0035] The half-shaft bearing simulator 200 simulates the bearing mounted on the half-shaft of the main reducer; the end cover simulator 300 simulates the end cover on the housing 2 of the main reducer; and the drive gear bearing simulator 500, after being installed in the drive gear mounting hole 23 on the housing 2, simulates the mounting position of the bearing on the drive gear on the housing 2. The test piece 400 can be a dial indicator, micrometer, or other testing equipment, or it can be a graduated ruler. Alternatively, the test piece 400 can be any other device with displacement distance testing capabilities.

[0036] Furthermore, the tolerance of the upper surface of the active gear bearing simulator 500 does not exceed 0.02mm, and the tolerance of the lower surface of the active gear bearing simulator 500 does not exceed 0.02mm. When the active gear bearing simulator 500 and the test unit 420 are in tandem, the readings are more stable and the reading jumps are smaller.

[0037] Before using the measuring fixture 1 to measure the housing 2 under test, the measuring fixture 1 needs to undergo a calibration stage to obtain a first reading displayed on the reading display unit 410 under standard conditions. At this time, the first reading can be recorded or reset to zero. Then, the measuring fixture 1 is installed on the housing 2 under test. Specifically, the half-shaft bearing simulator 200 is installed in the bearing mounting hole 21 on the housing 2, the end cover simulator 300 is installed in the end cover mounting hole 22, and the drive gear bearing simulator 500 is installed in the drive gear mounting hole 23. At this time, the drive gear bearing simulator 500 abuts against the test unit 420, and the reading display unit 410 can have a second reading. If the first reading is recorded during the calibration stage, the installation error between the central axis of the upper half-shaft of the housing 2 and the bottom surface of the drive gear bearing can be obtained by subtracting the first reading from the second reading. If the first reading is reset to zero during the calibration stage, the second reading is the installation error between the central axis of the upper half-shaft of the housing 2 and the bottom surface of the drive gear bearing.

[0038] Thus, since the orthographic projection of the reading display unit 410 on the projection plane perpendicular to the connecting shaft 100 is higher than the orthographic projection of the end cover simulation 300 and / or the orthographic projection of the half-shaft bearing simulation 200, the operator can directly observe the reading of the reading display unit 410. The measuring fixture 1 can quickly determine the installation distance between the central axis of the upper half-shaft of the housing 2 under test and the bottom surface of the bearing of the drive gear. By comparing with the standard installation distance, the installation error between the central axis of the upper half-shaft of the housing 2 under test and the bottom surface of the bearing of the drive gear can be obtained. Based on the installation error, it can be determined whether the measuring fixture 1 is qualified. The measurement cost is low, the operation is simple, the measurement result is reliable, and the measurement time is short. The measuring fixture 1 is suitable for the production process of small or medium batch housings 2.

[0039] In some embodiments, such as Figures 6-8 As shown, the measuring fixture 1 also includes a calibration component 600, which includes a base plate 610, a standard bearing support arm 620, and a standard end cap support arm 630. Both the standard bearing support arm 620 and the standard end cap support arm 630 are connected to the base plate 610. The standard bearing support arm 620 is suitable for supporting the half-shaft bearing simulation component 200, the standard end cap support arm 630 is suitable for supporting the end cap simulation component 300, and the base plate 610 is suitable for supporting the drive gear bearing simulation component 500.

[0040] The calibration component 600 may further include a first support plate 640 and a second support plate 650. Both the first support plate 640 and the second support plate 650 are connected to the base plate 610. The first support plate 640 is connected to the side of the standard bearing support arm 620 facing away from the standard end cap support arm 630, and the second support plate 650 is connected to the side of the standard end cap support arm 630 facing away from the standard bearing support arm 620.

[0041] Furthermore, the upper surface of the standard bearing support arm 620 is provided with a bearing support groove 621, and the half-shaft bearing simulation component 200 is installed into the bearing support groove 621. The upper surface of the standard end cap support arm 630 is provided with an end cap support groove 631, and the end cap simulation component 300 is installed into the end cap support groove 631. The calibration assembly 600 may also include a first limiting member 660 and a second limiting member 670. Both the first limiting member 660 and the second support plate 650 are connected to the base plate 610. The first limiting member 660 is used to limit the relative position between the half-shaft bearing simulation component 200 and the standard bearing support arm 620, preventing the half-shaft bearing simulation component 200 from moving out of the bearing support groove 621. The second limiting member 670 is connected to the side of the standard bearing support arm 620 facing away from the standard end cap support arm 630. The second limiting member 670 is used to limit the relative position between the end cap simulation 300 and the standard end cap support arm 630, to prevent the end cap simulation 300 from moving out of the end cap support groove 631, and to ensure the positioning reliability between the connecting shaft 100, the half shaft bearing simulation 200, the end cap simulation 300 and the calibration component 600.

[0042] The bottom surface of the standard bearing support arm 620 is provided with a first mounting hole 622 that mates with the base plate 610, and the side of the standard bearing support arm 620 facing the first limiting member 660 is provided with a first fixing hole 623 that mates with the first limiting member 660. The bottom surface of the standard end cap support arm 630 is provided with a second mounting hole 632 that mates with the base plate 610, and the side of the standard end cap support arm 630 facing the second limiting member 670 is provided with a second fixing hole 633 that mates with the second limiting member 670.

[0043] During the calibration phase, the standard bearing support arm 620 can support the half-shaft bearing simulator 200, the standard end cap support arm 630 can support the end cap simulator 300, and the base plate 610 can support the drive gear bearing simulator 500. At this time, the drive gear bearing simulator 500 abuts against the test section 420, and the reading display section 410 can have a first reading. At this time, the first reading can be recorded or the first reading can be reset to zero.

[0044] During the testing phase, the half-shaft bearing simulator 200 is installed in the bearing mounting hole 21 on the housing 2, the end cover simulator 300 is installed in the end cover mounting hole 22, and the drive gear bearing simulator 500 is installed in the drive gear mounting hole 23. At this time, the drive gear bearing simulator 500 abuts against the testing unit 420, and the reading display unit 410 can have a second reading. If the first reading is recorded during the calibration phase, the second reading is subtracted from the first reading to obtain the drive gear installation error on the housing 2. If the first reading is reset to zero during the calibration phase, the second reading is the drive gear installation error.

[0045] In this way, the measuring fixture 1 has a built-in calibration component 600, which can achieve the calibration of the test piece 400 without the need for an additional standard housing 2, thus reducing the calibration difficulty and simplifying the structure.

[0046] In some embodiments, such as Figure 2 and Figure 3 As shown, the half-shaft bearing simulation component 200 includes a first ring portion 210 and a second ring portion 220. The first ring portion 210 is sleeved on the connecting shaft 100, and the second ring portion 220 is sleeved on the connecting shaft 100. The second ring portion 220 and the first ring portion 210 are connected and arranged along the axial direction of the connecting shaft 100. The outer diameter of the second ring portion 220 is smaller than the outer diameter of the first ring portion 210.

[0047] By fitting both the first ring portion 210 and the second ring portion 220 onto the connecting shaft 100, the contact area between the half-shaft bearing simulation component 200 and the connecting shaft 100 is increased. This helps ensure the positioning reliability between the half-shaft bearing simulation component 200 and the connecting shaft 100, increases the structural strength of the half-shaft bearing simulation component 200, and reduces the probability of damage to the half-shaft bearing simulation component 200. Furthermore, because the outer diameter of the second ring portion 220 is smaller, the volume and weight of the half-shaft bearing simulation component 200 can be reduced, thus lowering costs.

[0048] In some embodiments, such as Figure 4 and Figure 5 As shown, the end cap simulation component 300 includes a third ring portion 310 and an arc-shaped portion 320. The third ring portion 310 is sleeved on the connecting shaft 100, and the arc-shaped portion 320 is connected to the outer peripheral surface of the third ring portion 310. The arc-shaped portion 320 has an arc-shaped surface 321, and the central angle corresponding to the arc-shaped surface 321 is A, where 180°≤A<360°. On the projection plane perpendicular to the connecting shaft 100, the orthographic projection of the reading display portion 410 is higher than the orthographic projection of the end cap simulation component 300.

[0049] In the main reducer, the cross-sectional area of ​​the end cover is usually larger than that of the bearing. When using the end cover simulator 300 to simulate the end cover, it is not necessary to make the shape of the end cover simulator 300 exactly the same as that of the end cover. By setting the arc surface 321 of the arc portion 320 to have the same central angle as the outer peripheral surface of the end cover, it is possible to ensure that the end cover simulator 300 can be effectively supported on the end cover mounting hole 22 of the housing 2. While ensuring that the housing 2 can be measured, the volume and weight of the end cover simulator 300 are reduced, thus reducing costs. Furthermore, the end cover simulator 300 does not obstruct the reading display 410, and there is a large gap between the upper surface of the end cover simulator 300 and the housing 2, making it easy for the operator to observe the value of the reading display 410 and facilitating the measurement of the housing 2.

[0050] By setting the third ring 310, the contact area between the end cap simulation 300 and the connecting shaft 100 can be ensured to be large enough, and the positioning between the end cap simulation 300 and the connecting shaft 100 is more reliable.

[0051] In some embodiments, the connecting shaft 100 has a plane of symmetry, the central axis of the connecting shaft 100 is located on the plane of symmetry, the plane of symmetry is perpendicular to the horizontal plane, and the plane of symmetry is parallel to a first direction. The half-shaft bearing simulation element 200 is symmetrically arranged with respect to the plane of symmetry, or the end cap simulation element 300 is symmetrically arranged with respect to the plane of symmetry, or both the half-shaft bearing simulation element 200 and the end cap simulation element 300 are symmetrically arranged with respect to the plane of symmetry.

[0052] In this way, the weight distribution of measuring fixture 1 is more uniform, which can prevent the measuring fixture 1 from rotating due to uneven weight distribution during the calibration and measurement stages, thereby improving the accuracy of calibration and measurement.

[0053] Among them, such as Figure 3 As shown, the thickness of the third ring portion 310 is greater than the thickness of the arc-shaped portion 320. Increasing the thickness of the third ring portion 310 increases the contact area between the third ring portion 310 and the connecting shaft 100, which helps ensure the positioning reliability between the third ring portion 310 and the connecting shaft 100, increases the structural strength of the third ring portion 310, and reduces the probability of damage to the end cap simulation component 300. Furthermore, since the arc-shaped portion 320 has a larger cross-sectional area, setting its thickness to be smaller effectively reduces the volume and weight of the end cap simulation component 300, thus lowering costs.

[0054] Furthermore, such as Figure 4 As shown, the end cap simulator 300 is provided with weight-reduction holes 330. These weight-reduction holes 330 are symmetrically arranged with respect to a plane of symmetry. For example, there may be one weight-reduction hole 330, in which case the plane of symmetry passes through the weight-reduction hole 330; or there may be two weight-reduction holes 330, located on opposite sides of the plane of symmetry. Of course, the number of weight-reduction holes 330 can also be other than one. By providing weight-reduction holes 330, the volume and weight of the end cap simulator 300 can be further reduced, thus lowering costs.

[0055] Along the radial direction of the end cap simulation 300 from the inside to the outside, the circumferential dimension of the weight reduction hole 330 gradually increases. The extension lines of the weight reduction hole 330 on both sides of the circumferential direction of the end cap simulation 300 can pass through the center point of the third ring 310, so that the force distribution on the end cap simulation 300 is more uniform.

[0056] In some embodiments, such as Figure 4As shown, the arc-shaped portion 320 has a slope 322, which is constructed on the upper surface of the arc-shaped portion 320. The slope 322 connects the arc-shaped surface 321 and the outer peripheral surface of the third ring portion 310. The height of the slope 322 gradually increases in the direction away from the third ring portion 310.

[0057] In this way, on the one hand, the arc length of the arc surface 321 can be increased, and during the calibration stage, the contact area between the end cap simulation 300 and the calibration component 600 can be increased, resulting in better positioning between the end cap simulation and the calibration component 600 and improving calibration reliability. During the measurement stage, the contact area between the end cap simulation 300 and the shell under test 2 can be increased, resulting in better positioning between the end cap simulation and the shell under test 2 and improving measurement reliability. On the other hand, the wall thickness of the weight reduction hole 330 can be increased, thereby improving the structural strength of the end cap simulation 300 and reducing the probability of damage to the end cap simulation 300.

[0058] In addition, there are two weight-reducing holes 330. The end cap simulation 300 forms a first wall 340 between the two weight-reducing holes 330. The end cap simulation 300 has a second wall 350 between the inclined surface 322 and the weight-reducing holes 330. The first wall 340 and the second wall 350 are more similar in shape and size, and the first wall 340 and the second wall 350 are more coordinated and consistent, ensuring the uniformity of the force on the end cap simulation 300.

[0059] In some embodiments, such as Figure 1 As shown, the test piece 400 also includes a fixing frame 430 and a sleeve 440. The fixing frame 430 is connected to the connecting shaft 100, the sleeve 440 is connected to the fixing frame 430, the test part 420 is movably disposed in the sleeve 440 along the first direction, and the upper end of the sleeve 440 is connected to the reading display part 410.

[0060] For example, the mounting bracket 430 can be sleeved on the connecting shaft 100, and the mounting bracket 430 and the connecting shaft 100 can be interference-fitted; or, the mounting bracket 430 and the connecting shaft 100 can be connected by threaded fasteners (such as screws or bolts); or, the mounting bracket 430 and the connecting shaft 100 can be welded together. The connection method between the mounting bracket 430 and the connecting shaft 100 is not limited.

[0061] The fixing frame 430 may be provided with two fixing arms, which are located on opposite sides of the sleeve 440. Fasteners are then inserted through the two fixing arms. By adjusting the tightness of the fasteners, the clamping force of the fixing arms on the sleeve 440 can be adjusted, thereby achieving the fixing and separation between the fixing frame 430 and the sleeve 440.

[0062] The relative positions of the test piece 400 and the connecting shaft 100 can be fixed by setting the fixing bracket 430, and the sleeve 440 can fix the reading display unit 410 and the testing unit 420. The reading display unit 410 will not shake or move relative to the connecting shaft 100, ensuring convenient reading, and the relative movement of the testing unit 420 and the connecting shaft 100 can be realized. The testing unit 420 can test the installation distance between the central axis of the upper half shaft of the housing 2 under test and the bottom surface of the bearing of the drive gear, ensuring the effectiveness of the measurement function of the measuring fixture 1.

[0063] In some embodiments, such as Figure 1 As shown, the active gear bearing simulation component 500 includes a first section 510, a second section 520, and a third section 530.

[0064] The first segment 510 abuts against the test section 420. The upper end of the second segment 520 is connected to the lower end of the first segment 510. The diameter of the second segment 520 is smaller than the diameter of the first segment 510. The upper end of the third segment 530 is connected to the lower end of the second segment 520. The diameter of the second segment 520 is smaller than the diameter of the third segment 530.

[0065] The first segment 510 and the third segment 530 simulate the bearings on the drive gear. The first segment 510 and the third segment 530 can be positioned with the drive gear mounting hole 23 on the housing 2. When testing the same type of main reducer, the dimensions of the first segment 510 and the third segment 530 are fixed, and the diameter of the third segment 530 can be larger than the diameter of the first segment 510.

[0066] By setting the diameter of the second segment 520 to be smaller, the relative position between the first segment 510 and the third segment 530 can be fixed, while the weight of the active gear bearing simulation component 500 can be reduced. This makes it easier to mate the active gear bearing simulation component 500 with the calibration component 600 and the housing 2 to be tested. Furthermore, the second segment 520 is easier for the operator to hold, making it more convenient for the operator to move the active gear bearing simulation component 500.

[0067] In some embodiments, such as Figure 1 As shown, the connecting shaft 100 includes a bearing section 110, an intermediate section 120, and an end cap section 130. A half-shaft bearing simulation component 200 is sleeved on the bearing section 110, and an end cap simulation component 300 is sleeved on the end cap section 130. The intermediate section 120 connects the bearing section 110 and the end cap section 130. The intermediate section 120 abuts against the side of the half-shaft bearing simulation component 200 facing the end cap section 130, and the intermediate section 120 abuts against the side of the end cap simulation component 300 facing the bearing section 110. While ensuring the connection of the connecting shaft 100, the half-shaft bearing simulation component 200, and the end cap simulation component 300, the relative positions of the half-shaft bearing simulation component 200 and the end cap simulation component 300 in the axial direction of the connecting shaft 100 can be determined.

[0068] Furthermore, the upper surface of the intermediate section 120 may be provided with a groove 140, the bottom surface of the groove 140 may be constructed as a plane, and the fixing frame 430 is installed in the groove 140. The fixing frame 430 is connected to the bottom surface of the groove 140. In this way, the overall size of the measuring fixture 1 in the first direction can be reduced, which is beneficial to placing the measuring fixture 1 in the housing 2. Moreover, the connection between the fixing frame 430 and the connecting shaft 100 has high reliability.

[0069] The bearing section 110 and the end cover section 130 can be coaxially arranged. The distance between the central axis of the bearing section 110 and the bottom surface of the drive gear bearing simulation component 500 in the first direction is the installation distance between the central axis of the half shaft and the bottom surface of the drive gear bearing.

[0070] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A measuring fixture suitable for measuring the housing (2) of a main reducer, characterized in that, include: Connecting shaft (100); A half-shaft bearing simulation component (200) is sleeved on the connecting shaft (100). End cap simulation component (300), the end cap simulation component (300) is sleeved on the connecting shaft (100); Test piece (400), the test piece (400) is connected to the connecting shaft (100), the test piece (400) is provided with a reading display part (410) and a test part (420), the test part (420) is movably arranged along a first direction, the first direction is perpendicular to the axial direction of the connecting shaft (100), the reading display part (410) is connected to the test part (420), on the projection plane perpendicular to the connecting shaft (100), the orthographic projection of the reading display part (410) is higher than the orthographic projection of the end cap simulation part (300) and / or the orthographic projection of the half shaft bearing simulation part (200); An active gear bearing simulator (500) abuts against the lower end of the test section (420).

2. The measuring fixture according to claim 1, characterized in that, The measuring fixture (1) also includes: A calibration assembly (600) includes a base plate (610), a standard bearing support arm (620), and a standard end cap support arm (630). The standard bearing support arm (620) and the standard end cap support arm (630) are both connected to the base plate (610). The standard bearing support arm (620) is adapted to support the half-shaft bearing simulator (200), the standard end cap support arm (630) is adapted to support the end cap simulator (300), and the base plate (610) is adapted to support the drive gear bearing simulator (500).

3. The measuring fixture according to claim 1, characterized in that, The half-shaft bearing simulation component (200) includes: The first ring (210) is sleeved on the connecting shaft (100). The second ring (220) is sleeved on the connecting shaft (100). The second ring (220) and the first ring (210) are connected and arranged along the axial direction of the connecting shaft (100). The outer diameter of the second ring (220) is smaller than the outer diameter of the first ring (210).

4. The measuring fixture according to claim 1, characterized in that, The end cap simulation component (300) includes: The third ring (310) is sleeved on the connecting shaft (100). The arc-shaped part (320) is connected to the outer peripheral surface of the third ring part (310). The arc-shaped part (320) has an arc-shaped surface (321). The central angle corresponding to the arc-shaped surface (321) is A, 180°≤A<360°. On the projection plane perpendicular to the connecting shaft (100), the orthographic projection of the reading display part (410) is higher than the orthographic projection of the end cap simulation part (300).

5. The measuring fixture according to claim 4, characterized in that, The arc-shaped portion (320) has a slope (322) which is constructed on the upper surface of the arc-shaped portion (320). The slope (322) connects the arc-shaped surface (321) and the outer peripheral surface of the third ring portion (310). The height of the slope (322) gradually increases in the direction away from the third ring portion (310).

6. The measuring fixture according to claim 4, characterized in that, The thickness of the third ring portion (310) is greater than the thickness of the arc-shaped portion (320).

7. The measuring fixture according to any one of claims 1-6, characterized in that, The end cap simulation component (300) is provided with a weight reduction hole (330).

8. The measuring fixture according to any one of claims 1-6, characterized in that, The connecting shaft (100) has a plane of symmetry, the central axis of the connecting shaft (100) is located on the plane of symmetry, and the plane of symmetry is parallel to the first direction; The half-shaft bearing simulator (200) is symmetrically arranged with respect to the symmetrical surface, and / or the end cap simulator (300) is symmetrically arranged with respect to the symmetrical surface.

9. The measuring fixture according to any one of claims 1-6, characterized in that, The test piece (400) also includes: A fixing frame (430) is connected to the connecting shaft (100); A sleeve (440) is connected to the fixing frame (430), and the testing part (420) is movably disposed inside the sleeve (440) along the first direction. The upper end of the sleeve (440) is connected to the reading display part (410).

10. The measuring fixture according to any one of claims 1-6, characterized in that, The drive gear bearing simulation component (500) includes: The first segment (510) abuts against the test section (420); The second segment (520) has its upper end connected to the lower end of the first segment (510), and the diameter of the second segment (520) is smaller than the diameter of the first segment (510). The upper end of the third segment (530) is connected to the lower end of the second segment (520), and the diameter of the second segment (520) is smaller than the diameter of the third segment (530).

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