A device and method for measuring inner ring distance of a fork joint bearing

Abstract

The present invention relates to the field of assembly and measurement technology, and in particular to a device and method for measuring the inner ring distance of a fork joint bearing. The device comprises a counter, a positioning assembly, and a measuring assembly; the counter is rectangular in shape and has a groove in the middle with a fixed width of L±0.005mm, which is used for dial indicator calibration. This device overcomes the difficulty and low precision of measuring the inner ring distance of a fork with ordinary measuring tools. The present application provides a device with accurate positioning, high measurement accuracy, simple and intuitive measurement, and the ability to meet the measurement requirements of a fork, effectively ensuring the assembly accuracy of a certain helicopter and improving the flight safety of the helicopter.

Description

Technical Field

[0001] The present invention relates to the technical field of assembly and measurement, and in particular to a device and method for measuring the inner ring distance of a fork-shaped joint bearing. Background Art

[0002] The fork is a matching part of the tail reducer of the tail rotor system of a certain type of helicopter. The fit between the fork and the spherical bearing is a clearance fit, such as Figure 1 As shown in the figure, assembly requires that the outer rings of the spherical plain bearings on both sides of the fork be pressed inward, while the inner rings of the spherical plain bearings are pressed outward. The inner distance between the two inner rings is L(+0.05, 0). During regular inspection and maintenance of the spherical plain bearings on the fork of a certain type of machine, it is necessary to measure the dimension L(+0.05, 0). However, it is difficult to position and press the outer rings of the spherical plain bearings on both sides of the fork inward, while the inner rings of the spherical plain bearings can rotate freely within a certain radial range, making it difficult to measure with ordinary gauges. Generally, assembly personnel use two positioning bushings to press the outer ring of the spherical plain bearing inward by hand, and use the inner measuring jaws of an ordinary caliper to clamp the inner ring of the bearing outward to directly read the size value. Due to the manual clamping and positioning, the force is unstable and the measurement error is large. In addition, the accuracy of the measured size is only 0.05mm, while the measurement accuracy of the caliper is only 0.02mm. Therefore, the final measurement error is large. If the measurement is incorrect, after the fork is assembled, the spherical plain bearing will wear more seriously during flight. When the bearing clearance is too large and exceeds the fixed inspection value, the tail rotor will vibrate, causing the spherical plain bearing to fail prematurely and the dynamic balance of the tail rotor to change frequently, which will seriously affect the flight safety of the aircraft. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problem of difficulty in measuring the inner ring distance value of a fork-shaped joint bearing. The present invention provides a device and method for measuring the inner ring distance of a fork-shaped joint bearing, which can effectively ensure the accuracy of the measured value, and the measurement is simple and easy to operate.

[0004] Technical Solution

[0005] A device for measuring the inner ring distance of a fork-shaped joint bearing comprises a counter (1), a positioning assembly, and a measuring assembly; the counter (1) is rectangular in shape and has a groove in the middle, the groove width of which is a fixed value of L±0.005 mm and is used for dial indicator calibration;

[0006] The positioning assembly consists of a knurled nut (2), a bushing (3), a positioning pin (4), a pull rod (5), a handle (6), a baffle (7), a slotted cylindrical head screw (8), a movable push rod (9), a shaft sleeve (10), a large compression spring (11), a push rod (22), a washer (23), a hexagonal nut (24), a hexagonal head bolt (25), a cylindrical pin (26), a bottom plate (27), a left base (28), a slotted screw (29), a flat plate (30) and a right base (31). The bottom plate (27), the left base (28) and the right base (31) are connected as a whole by using hexagonal bolts (25), cylindrical pins (26) and slotted screws (29), and the left base (28) and the right bottom plate (31) are concentric through the groove on the bottom plate (27); the shaft sleeve (10) is installed in the hole of the right base (31) with a transition fit, and the movable push rod (9) is installed in the hole of the right base (31) with the shaft sleeve (10) with a clearance fit, and is connected to the handle (6), the baffle (7) and the large compression spring (11) by the slotted cylindrical head screws (8) and the cylindrical pin (26). By turning the handle (6), the movable push rod (9) can be moved in the axial direction. Further, the cylindrical end face of the movable push rod (9) with a blind hole is perpendicular to the flat plate (30). The pull rod (5) is inserted into the light hole on the side of the right base (31) where the positioning pin (4) is installed, and passes through the bottom hole of the bushing (3) and is fixed with a knurled nut (2); the fixed push rod (22) is installed in the hole of the left base (28). It is connected as a whole through a washer (23) and a hexagonal nut (24). The fixed push rod (22) is concentric with the movable push rod (9), and the cylindrical end surface of the fixed push rod (22) with a blind hole is also perpendicular to the plate (30).

[0007] The measuring assembly consists of a dial indicator (12), a plug (13), a screw (14), a small compression spring (15), a set screw (16), a jacket (17), a meter frame (18), a meter shaft (19), a measuring body (20), and a measuring rod (21). The meter frame (18) and the measuring body (20) are fixed together by screws (14); the measuring rod (21) is loosely fitted into the small hole of the measuring body (20); the meter shaft (19) is loosely fitted into the waist-shaped hole of the measuring body (20), passes through the waist-shaped hole on the measuring body (20), and is interference-fitted into the radial hole of the measuring rod (21). The small compression spring (15) is installed in the small hole of the measuring body (20), with one end in contact with the measuring rod (21) and the other end in contact with the plug (13). The jacket (17) is loosely fitted into the large hole of the stepped hole of the meter frame (18) and positioned with the small hole end of the stepped hole. The dial indicator (12) is inserted into the hole of the meter frame (18) on which the jacket (17) is installed with a clearance fit, and the axial movement of the dial indicator (12) is fixed by a set screw (16). The plug (13) is a cylindrical body and is inserted into the large hole of the measuring body (20) with an interference fit, and the cylindrical side surface of the plug (13) is flush with the end surface of the measuring body (20).

[0008] The outer shape of the jacket (17) is a circular ring, the middle of the outer ring surface of which is provided with a ring groove, and slots are provided along the axial direction, and the inner hole is a smooth hole.

[0009] The meter frame (18) is formed in an "L" shape on the outside, with a threaded hole connected to the set screw (16) at the upper end, a stepped hole at the side, and a mounting hole for fixing the measuring body (20) at the bottom;

[0010] The alignment shaft (19) is a polished rod with a flat surface at one end and the other end passing through the waist-shaped hole of the measuring body (20) and having an interference fit with the radial hole on the measuring rod (21);

[0011] The measuring body (20) is a cylindrical body with two flat surfaces on both sides parallel to the axial direction. A threaded hole for fixing the table frame (18) is provided on one flat surface. A waist-shaped hole is also provided. The inner hole is a stepped hole. The large hole is matched with the plug (13). The end surface of the outer hole is flush with the end surface of the plug (13). The small hole is clearance-matched with the measuring rod (21).

[0012] The measuring rod (21) is a stepped shaft, the small cylinder is provided with a through hole in the radial direction for interference fit with the counter shaft (19), and the end face of the large cylinder is perpendicular to the axial direction of the small cylinder.

[0013] Furthermore, the outer diameter of the large cylinder of the movable push rod (9) and the fixed push rod (22) of the positioning assembly is smaller than the outer ring diameter of the joint bearing on the fork, and the blind hole diameter of the large cylinder is larger than the orifice diameter of the outer ring of the joint bearing on the fork.

[0014] Furthermore, the movable push rod (9) of the positioning assembly is concentric with the fixed push rod (22), and the cylindrical end faces of the movable push rod (9) and the fixed push rod (22) with blind holes are perpendicular to the flat plate (30), so that the outer rings of the joint bearings at both ends of the fork are pressed inward.

[0015] Furthermore, the cylindrical side surface of the plug (13) of the measuring assembly is flush with the end surface of the measuring body (20) and parallel to the flat surface of the alignment axis (19);

[0016] A method for measuring the inner ring distance of a fork spherical bearing comprises the following steps:

[0017] It includes the following steps:

[0018] Step 1: Place the base (27) flat on the platform, turn the handle (6) to pull out the movable push rod (9);

[0019] Step 2: Fit the outer ring of the joint bearing on one side of the tail rotor fork (32) to be tested to the surface of the fixed push rod (22) and make them concentric, turn the handle (6) so that the movable push rod (9) presses the outer ring of the joint bearing on the other side of the tail rotor fork (32), place the root of the fork (32) on the flat plate (30), tighten the knurled nut (2) to lock and fix the movable push rod (9), so that the outer rings of the pair of joint bearings of the tail rotor fork are completely fixed due to the inward force;

[0020] Step 3: Insert the dial indicator (12) into the jacket (17) in the hole of the dial indicator frame (18), so that the probe of the dial indicator (12) contacts the flat surface of the dial indicator shaft (19), and the dial indicator (6) has a certain reading, then tighten the set screw (16) to fix the dial indicator (12) firmly.

[0021] Step 4: Push the alignment shaft (19), place the measuring body (20) into the groove of the alignment member (1), and align the dial, that is, rotate the dial of the dial indicator (12) so that the pointer is at the "0" position on the dial.

[0022] Step 5: Remove the aligned measuring body (20), push the alignment shaft (19), and place it between a pair of joint bearings of the tail rotor fork (32), so that the measuring body (20) fits with the inner ring of the joint bearing on one side of the fork, and the measuring rod (21) fits with the inner ring of the joint bearing on the other side of the fork (32).

[0023] Step 6: Hold (20) tightly with your hand so that there is no shaking, and then read the dial indicator (12). If the reading is between 0-0.050mm, it is determined that the distance between the inner rings of the joint bearings on both sides of the fork is qualified and meets the size requirement of L(+0.05, 0)mm; if the reading is not within the range of 0-0.050mm, it is determined that the distance between the inner rings of the joint bearings on both sides of the fork is unqualified.

[0024] Technical Effects

[0025] A device and method for measuring the inner ring distance of a fork joint bearing overcome the problems of difficulty and low precision in measuring the inner ring distance of a fork using ordinary measuring tools. This application provides a device and method for measuring the inner ring distance of a fork with accurate positioning, high measurement accuracy, simple and intuitive measurement, which can meet the measurement requirements of the fork, effectively ensure the assembly accuracy of a certain helicopter, and improve the flight safety of the helicopter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic diagram of the fork structure;

[0027] Figure 2 This is a structural diagram of the positioning component and measurement component of this application;

[0028] Figure 3 yes Figure 2A top view of

[0029] Figure 4 yes Figure 3 AA partial cross-sectional view;

[0030] Figure 5 It is a schematic diagram of the structure of the watch;

[0031] Figure 6 It is a schematic diagram of the application structure of this application;

[0032] Figure 7 is an axonometric diagram of the present application;

[0033] Figure 8 It is a structural diagram of a movable ejector rod;

[0034] Figure 9 It is a structural diagram of the large bushing;

[0035] Figure 10 It is a schematic diagram of the structure of the jacket;

[0036] Figure 11 It is a structural diagram of the measuring body. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the following embodiments. The following are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1

[0039] The present invention is described in further detail below: Figure 1-10A fork-shaped joint bearing inner ring distance measuring tool, comprising a gauge (1), a knurled nut (2), a bushing (3), a positioning pin (4), a pull rod (5), a handle (6), a baffle (7), a slotted cylindrical head screw (8), a movable push rod (9), a sleeve (10), a large compression spring (11), a dial indicator (12), a plug (13), a screw (14), a small compression spring (15), a set screw (16), a sleeve (17), and a gauge stand (18). , alignment shaft (19), measuring body (20), measuring rod (21), push rod (22), washer (23), hexagonal nut (24), hexagonal bolt (25), cylindrical pin (26), bottom plate (27), base 1 (28), slotted screw (29), flat plate (30), bottom plate 2 (31), fork-shaped piece (32). The alignment piece (1) is rectangular in shape, with a groove in the middle, and the groove width L is a fixed value of ±0.005mm, for the dial indicator alignment value. The knurled nut (2) is a nut with a large outer circle and knurling characteristics; the bushing (3) is a cylinder with an axial cross-section of a concave arc groove with a radius R at one end, and a through hole at the center. Further, the bushing (3) is installed in the light hole of the bottom plate 2 (31) and has a gap. The positioning pin (4) is a cylinder, which is installed in the small hole on the side of the base 2 (31) and passes through the groove on the large outer circle of the pull rod (5) to fix the axial rotation of the pull rod (5). The pull rod (5) is a stepped shaft, one end of which is a large cylinder with a groove in the axial direction of the cylindrical surface, and the other end is a small cylinder with a thread of a certain length. The middle part is an optical axis with a certain precision, and the optical axis close to the side of the small cylinder is provided with a concave arc groove of radius R. Further, the pull rod (5) passes through the light hole from the side of the bottom plate 2 (31) where the positioning pin (4) is installed, passes through the bottom hole of the bushing (3), and is fixed with a knurled nut (2); the handle (6) is a handle at one end and a rectangle with rounded corners and beveled features at the other end, and is provided with a pin hole that is interference fit with the cylindrical pin (26). Further, the handle (6) is connected with the cylindrical pin (26) and is installed in the middle of the axial notch of the movable push rod (9); The baffle (7) is a rectangular parallelepiped with two through holes in thickness. The baffle (7) passes through the notch of a movable push rod (9) equipped with a large compression spring (11). The movable push rod (9) is fixed to the light hole of the base 2 (31) through a slotted cylindrical head screw (8). The movable push rod (9) is a stepped shaft, which is a large cylinder with a blind hole on its end face and a small cylinder at the other end with a deep hole drilled in the center and a notch in the axial direction. The sleeve (10) is also a stepped shaft with a through hole in the center and a semicircular notch perpendicular to the axial direction on the side closer to the large cylinder.The plug (13) is a cylinder, which is interference-fitted with the inner hole of the measuring body (20); the outer shape of the jacket (17) is a cylinder, with an empty knife groove in the middle, and its axial cross-section is annular, and is slotted along the axial direction; the outer shape of the meter frame (18) is "L"-shaped, with a threaded hole connected to the set screw (16) at the upper end, a through hole with a clearance fit with the jacket (17) at the side, and a mounting bolt hole fixed to the measuring body (20) at the bottom; the meter shaft (19) is a polished rod, one end of which passes through the waist-shaped hole of the measuring body (20) and is interference-fitted with the radial hole on the measuring rod, and the other end is provided with a groove; the measuring body (2 0) is a cylindrical body with flat surfaces on both sides parallel to the axis. One side of the flat surface is provided with a threaded hole for fixing the table frame (18), and is also provided with a waist-shaped hole. The bottom hole is a stepped hole. The large hole matches the plug (13), and the outer hole end face is flush with the end face of the plug (13). The small hole is clearance-matched with the measuring rod (21); the measuring rod (21) is a stepped shaft, and the small cylinder is radially provided with a through hole that is interference-fitted with the table shaft (19); the fixed top rod (22) is also a stepped shaft, one end of which is threaded and the other end is a cylinder with a blind hole, and the middle is the outer circle of the polished rod, and the polished rod is clearance-matched with the through hole on the side of the base 1 (28). The bottom plate (27) is a rectangular parallelepiped, and is provided with positioning holes and threaded holes for fixing the base 1 (28), the flat plate (30) and the base 2 (31) in the height direction. Furthermore, a straight groove is provided in the middle of the bottom plate (27) in the longitudinal direction for positioning the base 1 (28) and the base 2 (31) to ensure that the through holes on the two sides are concentric; the base of the base 1 (28) is provided with a positioning hole and a mounting hole for positioning and connecting to the bottom plate (27); a through hole is provided on the column above the base, and is gap-connected with the fixed top rod (22), and is fixed as a whole by a gasket (23) and a hexagonal nut (24). Furthermore, a boss is provided in the middle below the base, and is gap-matched with the groove on the bottom plate (27). The flat plate (30) is a rectangular parallelepiped, and is provided with four screw countersunk holes near the four corners, and is fixed to the bottom plate (27) by slotted screws (29); the base of the base 2 (31) is also provided with a positioning hole and a mounting hole for positioning and connecting to the bottom plate (27), and a step hole is provided on the column above the base, and the step hole is interference-fitted with the large bushing (10). The small hole end face of the stepped hole is symmetrically provided with two threaded holes for fixing the baffle (7). Furthermore, a straight hole is provided on the side of the large hole near the stepped hole, a certain distance from the end face and perpendicular to the axial direction of the hole, and a positioning hole is arranged on the end face of the straight hole for positioning the axial rotation of the pull rod (5). In addition, a boss is provided in the middle of the lower part of the base, and is clearance-matched with the groove on the bottom plate (27).

[0040] The present invention also provides a method for measuring the distance between inner rings of a fork, which is characterized by comprising the following steps:

[0041] Step 1: Place the base (27) flat on the platform, turn the handle (6) to pull out the movable push rod (9);

[0042] Step 2: Fit the outer ring of the joint bearing on one side of the tail rotor fork (32) to be tested to the surface of the fixed push rod (22) and make them concentric, turn the handle (6) so that the movable push rod (9) presses the outer ring of the joint bearing on the other side of the tail rotor fork (32), place the root of the fork (32) on the flat plate (30), tighten the knurled nut (2) to lock and fix the movable push rod (9), so that the outer rings of the pair of joint bearings of the tail rotor fork are completely fixed due to the inward force;

[0043] Step 3: Insert the dial indicator (12) into the jacket (17) in the hole of the dial indicator frame (18), so that the probe of the dial indicator (12) contacts the flat surface of the dial indicator shaft (19), and the dial indicator (6) has a certain reading, then tighten the set screw (16) to fix the dial indicator (12) firmly.

[0044] Step 4: Push the alignment shaft (19), place the measuring body (20) into the groove of the alignment member (1), and align the dial, that is, rotate the dial of the dial indicator (12) so that the pointer is at the "0" position on the dial.

[0045] Step 5: Remove the aligned measuring body (20), push the alignment shaft (19), and place it between a pair of joint bearings of the tail rotor fork (32), so that the measuring body (20) fits with the inner ring of the joint bearing on one side of the fork, and the measuring rod (21) fits with the inner ring of the joint bearing on the other side of the fork (32).

[0046] Step 6: Hold (20) tightly with your hand so that there is no shaking, and then read the dial indicator (12). If the reading is between 0-0.050mm, it is determined that the distance between the inner rings of the joint bearings on both sides of the fork is qualified and meets the size requirement of L(+0.05, 0)mm; if the reading is not within the range of 0-0.050mm, it is determined that the distance between the inner rings of the joint bearings on both sides of the fork is unqualified.

[0047] Example 2

[0048] A device for measuring the inner ring distance of a fork-shaped joint bearing comprises a counter (1), a positioning component, and a measuring component; the counter 1 is rectangular in shape and has a groove in the middle, the groove width of which is a fixed value of L±0.005 mm and is used for dial indicator calibration;

[0049] The positioning assembly consists of a knurled nut (2), a bushing (3), a positioning pin (4), a pull rod (5), a handle (6), a baffle (7), a slotted cylindrical head screw (8), a movable push rod (9), a shaft sleeve (10), a large compression spring (11), a push rod (22), a washer (23), a hexagonal nut (24), a hexagonal head bolt (25), a cylindrical pin (26), a bottom plate (27), a left base (28), a slotted screw (29), a flat plate (30) and a right base (31). The bottom plate (27), the left base (28) and the right base (31) are connected as a whole by using hexagonal bolts (25), cylindrical pins (26) and slotted screws (29), and the left base (28) and the right bottom plate (31) are concentric through the groove on the bottom plate (27); the shaft sleeve (10) is installed in the hole of the right base (31) with a transition fit, and the movable push rod (9) is installed in the hole of the right base (31) with the shaft sleeve (10) with a clearance fit, and is connected to the handle (6), the baffle (7) and the large compression spring (11) by the slotted cylindrical head screws (8) and the cylindrical pin (26). By turning the handle (6), the movable push rod (9) can be moved in the axial direction. Further, the cylindrical end face of the movable push rod (9) with a blind hole is perpendicular to the flat plate (30). The pull rod (5) is inserted into the light hole on the side of the right base (31) where the positioning pin (4) is installed, and passes through the bottom hole of the bushing (3) and is fixed with a knurled nut (2); the fixed push rod (22) is installed in the hole of the left base (28). It is connected as a whole through a washer (23) and a hexagonal nut (24). The fixed push rod (22) is concentric with the movable push rod (9), and the cylindrical end surface of the fixed push rod (22) with a blind hole is also perpendicular to the plate (30).

[0050] The measuring assembly consists of a dial indicator (12), a plug (13), a screw (14), a small compression spring (15), a set screw (16), a jacket (17), a meter frame (18), a meter shaft (19), a measuring body (20), and a measuring rod (21). The meter frame (18) and the measuring body (20) are fixed together by screws (14); the measuring rod (21) is loosely fitted into the small hole of the measuring body (20); the meter shaft (19) is loosely fitted into the waist-shaped hole of the measuring body (20), passes through the waist-shaped hole on the measuring body (20), and is interference-fitted into the radial hole of the measuring rod (21). The small compression spring (15) is installed in the small hole of the measuring body (20), with one end in contact with the measuring rod (21) and the other end in contact with the plug (13). The jacket (17) is loosely fitted into the large hole of the stepped hole of the meter frame (18) and positioned with the small hole end of the stepped hole. The dial indicator (12) is inserted into the hole of the meter frame (18) on which the jacket (17) is installed with a clearance fit, and the axial movement of the dial indicator (12) is fixed by a set screw (16). The plug (13) is a cylindrical body and is inserted into the large hole of the measuring body (20) with an interference fit, and the cylindrical side surface of the plug (13) is flush with the end surface of the measuring body (20).

[0051] The outer shape of the jacket (17) is a circular ring, the middle of the outer ring surface of which is provided with a ring groove, and a slot is provided along the axial direction, and the inner hole is a smooth hole, such as Figure 10 As shown;

[0052] The meter frame (18) is formed in an "L" shape on the outside, with a threaded hole connected to the set screw (16) at the upper end, a stepped hole at the side, and a mounting hole for fixing the measuring body (20) at the bottom;

[0053] The alignment shaft (19) is a polished rod with a flat surface at one end and the other end passing through the waist-shaped hole of the measuring body (20) and having an interference fit with the radial hole on the measuring rod (21);

[0054] The measuring body (20) is a cylindrical body with two flat surfaces on both sides parallel to the axial direction. A threaded hole for fixing the table frame (18) is provided on one flat surface. A waist-shaped hole is also provided. The inner hole is a stepped hole. The large hole is matched with the plug (13). The end surface of the outer hole is flush with the end surface of the plug (13). The small hole is in clearance with the measuring rod (21). Figure 11 As shown;

[0055] The measuring rod (21) is a stepped shaft, the small cylinder is provided with a through hole in the radial direction for interference fit with the counter shaft (19), and the end face of the large cylinder is perpendicular to the axial direction of the small cylinder.

[0056] Furthermore, the outer diameter of the large cylinder of the movable push rod (9) and the fixed push rod (22) of the positioning assembly is smaller than the outer ring diameter of the joint bearing on the fork, and the blind hole diameter of the large cylinder is larger than the orifice diameter of the outer ring of the joint bearing on the fork, ensuring that the outer ring of the joint bearing is completely pressed inward.

[0057] Furthermore, the movable push rod (9) of the positioning assembly is concentric with the fixed push rod (22), and the cylindrical end faces of the movable push rod (9) and the fixed push rod (22) with blind holes are perpendicular to the flat plate (30), so that the outer rings of the joint bearings at both ends of the fork are pressed inward, ensuring that the fork and the joint bearings at both ends are correctly positioned, facilitating accurate measurement of the inner ring distance.

[0058] Furthermore, the cylindrical side surface of the plug (13) of the measuring assembly is flush with the end surface of the measuring body (20) and parallel to the flat surface of the alignment axis (19), ensuring that the dial indicator reading is error-free when measuring the distance between the inner rings of the joint bearings on both sides of the fork;

[0059] Furthermore, the measuring rod (21) can press the inner rings of the joint bearings on both sides of the fork-shaped member outward under the preload force of the small compression spring (15), thereby achieving accurate positioning;

[0060] Furthermore, under the action of external force, the alignment shaft (19) will drive the measuring rod (21) to move along the length direction of the waist-shaped hole of the measuring body (20), so that the measuring assembly can be easily installed in the alignment block and the inner ring of the joint bearing on both sides of the fork-shaped member, which is convenient for reading and measuring the dial indicator (12).

[0061] Furthermore, the movable ejector rod (9) and the fixed ejector rod (22) are made of tool rod T8A, the material of which has high hardness and wear resistance, ensuring that the movable ejector rod (9) and the fixed ejector rod (22) are not easily worn during frequent use and maintain a certain shape and position accuracy.

[0062] Furthermore, the plug (13), the alignment shaft (19), the measuring body (20) and the measuring rod (21) are made of bearing steel GCr15, which has high hardness, good wear resistance and dimensional stability, ensuring that when measuring the inner rings of the joint bearings on both sides of the fork, the measuring surface is not easy to wear and maintains stable shape and position dimensions, thereby making the measurement quality stable.

[0063] Furthermore, the watch element (1) is made of alloy steel CrMn, which has high hardness, high dimensional stability, small deformation during heat treatment, and is easy to ensure dimensional accuracy.

[0064] A method for measuring the inner ring distance of a fork spherical bearing comprises the following steps:

[0065] It includes the following steps:

[0066] Step 1: Place the base (27) flat on the platform, turn the handle (6) to pull out the movable push rod (9);

[0067] Step 2: Fit the outer ring of the joint bearing on one side of the tail rotor fork (32) to be tested to the surface of the fixed push rod (22) and make them concentric, turn the handle (6) so that the movable push rod (9) presses the outer ring of the joint bearing on the other side of the tail rotor fork (32), place the root of the fork (32) on the flat plate (30), tighten the knurled nut (2) to lock and fix the movable push rod (9), so that the outer rings of the pair of joint bearings of the tail rotor fork are completely fixed due to the inward force;

[0068] Step 3: Insert the dial indicator (12) into the jacket (17) in the hole of the dial indicator frame (18), so that the probe of the dial indicator (12) contacts the flat surface of the dial indicator shaft (19), and the dial indicator (6) has a certain reading, then tighten the set screw (16) to fix the dial indicator (12) firmly.

[0069] Step 4: Push the alignment shaft (19), place the measuring body (20) into the groove of the alignment member (1), and align the dial, that is, rotate the dial of the dial indicator (12) so that the pointer is at the "0" position on the dial.

[0070] Step 5: Remove the aligned measuring body (20), push the alignment shaft (19), and place it between a pair of joint bearings of the tail rotor fork (32), so that the measuring body (20) fits with the inner ring of the joint bearing on one side of the fork, and the measuring rod (21) fits with the inner ring of the joint bearing on the other side of the fork (32).

[0071] Step 6: Hold (20) tightly with your hand so that there is no shaking, and then read the dial indicator (12). If the reading is between 0-0.050mm, it is determined that the distance between the inner rings of the joint bearings on both sides of the fork is qualified and meets the size requirement of L(+0.05, 0)mm; if the reading is not within the range of 0-0.050mm, it is determined that the distance between the inner rings of the joint bearings on both sides of the fork is unqualified.

[0072] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with that in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein. The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for measuring the inner ring distance of a fork joint bearing, characterized in that: It includes a watch alignment component, a positioning component, and a measuring component; the watch alignment component is rectangular in shape with a groove in the middle; The positioning assembly consists of a knurled nut, a bushing, a positioning pin, a pull rod, a handle, a baffle, a slotted cylindrical head screw, a movable push rod, a sleeve, a large compression spring, a push rod, a washer, a hexagonal nut, a hexagonal head bolt, a cylindrical pin, a base plate, a left base, a slotted screw, a flat plate and a right base; the base plate, the left base and the right base are connected as a whole using hexagonal head bolts, cylindrical pins and slotted screws, and the left base and the right base plate are concentric through the grooves on the base plate; the sleeve is installed in the hole of the right base with a transition fit In the figure, the movable ejector rod is installed with clearance fit in the hole of the right base with the shaft sleeve installed, and is connected to the handle, baffle and large compression spring through slotted cylindrical head screws and cylindrical pins. By turning the handle, the movable ejector rod can be moved in the axial direction. The cylindrical end face of the movable ejector rod with a blind hole is perpendicular to the plate; the pull rod is inserted into the light hole on the side of the right base with the locating pin installed, and passes through the bottom hole of the bushing and is fixed with a knurled nut; the fixed ejector rod is installed in the hole of the left base; and they are connected as a whole through washers and hexagonal nuts. The fixed push rod is concentric with the movable push rod, and the cylindrical end surface of the fixed push rod with a blind hole is also perpendicular to the flat plate; The measuring assembly consists of a dial indicator, a plug, a screw, a small compression spring, a set screw, a jacket, a gauge frame, an alignment shaft, a measuring body, and a measuring rod. The gauge frame and the measuring body are fixed together with screws. The measuring rod is loosely fitted into the small hole of the measuring body. The alignment shaft is loosely fitted into the waist-shaped hole of the measuring body, passes through the waist-shaped hole on the measuring body, and is interference-fitted into the radial hole of the measuring rod. The small compression spring is installed in the small hole of the measuring body, with one end in contact with the measuring rod and the other end in contact with the plug. The jacket is loosely fitted into the large hole of the stepped hole of the gauge frame and positioned with the small hole end of the stepped hole. The dial indicator is inserted into the hole of the meter frame with the jacket installed with a clearance fit, and the axial movement of the dial indicator is fixed by a set screw; the plug is a cylinder, which is inserted into the large hole of the measuring body with an interference fit, and the cylindrical side of the plug is flush with the end face of the measuring body.

2. A fork joint bearing inner ring distance measuring device according to claim 1, characterized in that: The outer shape of the jacket is a circular ring, the middle of the outer ring surface of the jacket is provided with a ring groove, and slots are provided along the axial direction, and the inner hole is a smooth hole.

3. The device for measuring the inner ring distance of a fork joint bearing according to claim 1, characterized in that: The meter frame is formed into an "L" shape on the outside, with a threaded hole connected to a set screw at the upper end, a stepped hole at the side, and a mounting hole for fixing the measuring body at the bottom.

4. A fork joint bearing inner ring distance measuring device according to claim 1, characterized in that: The alignment shaft is a polished rod with a flat surface at one end and the other end passing through the waist-shaped hole of the measuring body and interference-fitting with the radial hole on the measuring rod.

5. The device for measuring the inner ring distance of a fork joint bearing according to claim 1, characterized in that: The measuring body is a cylinder with two flat surfaces on both sides parallel to the axis. A threaded hole for fixing the table frame is provided on one flat surface, and a waist-shaped hole is also provided. The inner hole is a stepped hole, the large hole cooperates with the plug, and the end face of the outer hole is flush with the end face of the plug, and the small hole has a clearance fit with the measuring rod.

6. The device for measuring the inner ring distance of a fork joint bearing according to claim 1, characterized in that: The measuring rod is a stepped shaft, the small cylinder is radially provided with a through hole which is interference fit with the counter shaft, and the end face of the large cylinder is perpendicular to the axial direction of the small cylinder.

7. The device for measuring the inner ring distance of a fork joint bearing according to claim 1, characterized in that: The outer diameter of the large cylinder of the movable ejector rod and the fixed ejector rod of the positioning assembly is smaller than the outer ring diameter of the joint bearing on the fork, and the blind hole diameter of the large cylinder is larger than the orifice diameter of the outer ring of the joint bearing on the fork.

8. The device for measuring the inner ring distance of a fork joint bearing according to claim 1, characterized in that: The movable ejector rod of the positioning assembly is concentric with the fixed ejector rod, and the cylindrical end faces of the movable ejector rod and the fixed ejector rod with blind holes are perpendicular to the flat plate, so that the outer rings of the joint bearings at both ends of the fork are pressed inward.

9. The device for measuring the inner ring distance of a fork joint bearing according to claim 1, characterized in that: The cylindrical side surface of the plug of the measuring component is flush with the end surface of the measuring body and parallel to the flat surface of the measuring axis.

10. A method for measuring the inner ring distance of a spherical bearing using the device according to claim 1, characterized in that: The following steps are involved: Step 1: Place the base flat on the platform and turn the handle to pull out the movable ejector rod. Step 2: Fit the outer ring of the spherical bearing on one side of the tail rotor fork to be tested to the surface of the fixed push rod, and make them concentric. Turn the handle so that the movable push rod presses the outer ring of the spherical bearing on the other side of the tail rotor fork. Place the base of the fork on a flat plate, tighten the knurled nut to lock and secure the movable push rod. The outer rings of the pair of spherical bearings of the tail rotor fork are completely fixed due to the inward force. Step 3: Insert the dial indicator rod into the sleeve in the hole of the dial indicator frame, so that the dial indicator probe contacts the flat surface of the dial indicator shaft and the dial indicator has a certain reading, then tighten the set screw to fix the dial indicator firmly; Step 4: Push the alignment shaft, place the measuring body into the groove of the alignment part, and align the dial, that is, turn the dial of the dial indicator so that the pointer is at the "0" position on the dial; Step 5: Remove the aligned measuring body, push the alignment shaft, and place it between the pair of spherical plain bearings on the tail rotor fork, ensuring that the measuring body fits against the inner ring of the spherical plain bearing on one side of the fork, and the measuring rod fits against the inner ring of the spherical plain bearing on the other side of the fork. Step 6: Hold the measuring body tightly with your hands so that there is no shaking, and then read the dial indicator reading. If the reading is between 0-0.050mm, it is determined that the distance between the inner rings of the spherical bearings on both sides of the fork is qualified and meets the size requirement of L(+0.05, 0)mm; if the reading is not within the range of 0-0.050mm, it is determined that the distance between the inner rings of the spherical bearings on both sides of the fork is unqualified.

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