Bushing swing wear life test tool

Abstract

The utility model belongs to the technical field of bearing test, and particularly relates to a bushing swing wear life test tool, which comprises a left support bearing and a right support bearing which are respectively arranged in a left support seat and a right support seat, a left support sleeve and a right support sleeve which are respectively arranged in the support bearings, and a stepped shaft provided with a left thread, a middle shaft shoulder and a right shaft shoulder, the stepped shaft sequentially penetrates through the right supporting sleeve, a to-be-tested lining installed in the pressing plate and the left supporting sleeve; the left supporting sleeve is locked with a middle shaft shoulder of the stepped shaft through a left thread of the stepped shaft, a nut, a check ring and an inner ring of a left supporting bearing; the right supporting sleeve is locked with a right shaft shoulder of the stepped shaft through a bolt structure and an inner ring of a right supporting bearing; according to the test tool, the stepped shaft is adopted to increase the diameter, the yield strength is improved, the structure is simple, the performance is reliable, mounting and dismounting are convenient and fast, test faults are reduced, the stability is enhanced, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tests, and particularly relates to a bushing swing wear life test tooling. Background Art

[0002] A bushing refers to a ring sleeve that plays a role in cushioning and reducing friction. In the field of aerospace, bushings are usually located at the bearing points of aircraft. Bushings can reduce the wear of shafts, and the bushings can be replaced when worn to a certain extent. Before use, a life wear test should be carried out on the bushing to provide strong support for the actual use of the bushing and ensure the quality and life during subsequent use.

[0003] The existing swing tooling for spherical plain bearings realizes the swing wear of the outer ring of the spherical plain bearing by clamping the inner ring of the spherical plain bearing. In the wear test, under the condition of the same inner diameter size, the bushing bears a greater load than the spherical plain bearing, and the same is true for small bushings, which poses a greater test for the swing shaft of the small bushing wear test. If the strength of the shaft is not high enough, it is possible that the swing shaft breaks before the wear test is completed.

[0004] Therefore, there is an urgent need for a bushing high-load swing wear test tooling with a simple structure, reliable performance, and convenient installation and disassembly to solve the problems in the above-mentioned existing technologies. Content of the Utility Model

[0005] The utility model is committed to solving the deficiencies of the existing bearing test technologies, and provides a bushing swing wear life test tooling.

[0006] On the one hand, the utility model provides a bushing swing wear life test tooling, which includes: a stepped shaft, a left support sleeve, a right support sleeve, a left support bearing, a right support bearing, a left support seat, a right support seat and a pressing plate. Among them, the left support bearing is installed in the left support seat, and the right support bearing is installed in the right support seat; the left support sleeve is installed in the left support bearing, and the right support sleeve is installed in the right support bearing; the stepped shaft has a left thread, a middle shaft shoulder, and a right shaft shoulder. The stepped shaft sequentially passes through the right support sleeve, the bushing to be tested installed in the pressing plate, and the left support sleeve; the left support sleeve is locked with the middle shaft shoulder of the stepped shaft through the left thread of the stepped shaft, a nut, a retaining ring, and the inner ring of the left support bearing; the right support sleeve is locked with the right shaft shoulder of the stepped shaft through a bolt structure and the inner ring of the right support bearing; a cube structure is arranged on the right side of the stepped shaft for connecting with a drive system.

[0007] In an optional embodiment, a first assembly gap is arranged between the left end face of the left support sleeve and the right end face of the retaining ring, and the first assembly gap is used to lock the left support sleeve and the retaining ring.

[0008] In an alternative embodiment, a second assembly gap is provided between the right end face of the right support sleeve and the shoulder end face on the right side of the stepped shaft; the second assembly gap is used to lock the right support sleeve and the shoulder on the right side of the stepped shaft.

[0009] In an alternative embodiment, through holes evenly distributed are provided on the shoulder end face on the right side of the stepped shaft, and corresponding threaded holes evenly distributed are provided on the right end face of the right support sleeve. The right support sleeve is locked to the shoulder on the right side of the stepped shaft by bolts.

[0010] In an alternative embodiment, at least two through holes evenly distributed are provided on the right end face of the stepped shaft; at least two corresponding threaded holes evenly distributed are provided on the right end face of the right support sleeve.

[0011] In an alternative embodiment, four through holes evenly distributed are provided on the right end face of the stepped shaft; four corresponding threaded holes evenly distributed are provided on the right end face of the right support sleeve.

[0012] In an alternative embodiment, the stepped shaft locks the left support sleeve, the inner ring of the left support bearing, and the retaining ring to the threaded portion of the stepped shaft through the shoulder in the middle thereof in the radial direction. The locking structure is used to limit the radial displacement of the components and improve the axial stability.

[0013] In an alternative embodiment, the right support seat is fixedly connected to the outer ring of the right support bearing, the left support seat is fixedly connected to the outer ring of the left support bearing, and the left support seat and the right support seat are connected to the fixed base to realize the limit installation of the overall tooling.

[0014] In an alternative embodiment, the drive system realizes periodic swinging through the right-side cube structure of the stepped shaft. The drive devices of the drive system include but are not limited to servo motors and hydraulic cylinders. Among them, servo motors are suitable for high-frequency and low-load tests, and hydraulic cylinders are suitable for low-frequency and high-load tests.

[0015] In an alternative embodiment, the pressing plate is installed at the middle position of the stepped shaft for fixing the bushing, and the pressing plate and the bushing are in a static state during the test.

[0016] In an alternative embodiment, the pressing plate serves as an external force loading component to apply a radial dynamic load to the bushing; the stepped shaft serves as a rotating component, and the stepped shaft swings periodically to realize the wear life test of the bushing.

[0017] In an alternative embodiment, it includes: the bolt structure includes socket head cap screws and square head bolts.

[0018] In an alternative embodiment, the left support bearing and the right support bearing include tapered roller bearings.

[0019] For the bushing swing wear life test tooling of the present utility model, the drive system directly drives the stepped shaft to achieve relative periodic displacement of the bushing, so as to realize the bushing wear test. The left support sleeve is locked with the shoulder in the middle of the stepped shaft through a retaining ring and a lock nut, and the right support sleeve is locked with the right shoulder of the stepped shaft through an internal hexagonal screw. Thus, the stepped shaft, the left and right support sleeves, and the inner rings of the left and right support bearings are locked into one body. The drive system drives the stepped shaft to achieve its periodic swing, realizing the swing relative to the bushing, so as to conduct the bushing wear test. The swing shaft of this set of test tooling adopts a stepped shaft, which increases the diameter of the shaft and the yield strength of the shaft. Therefore, it has reliable performance, simple structure, is convenient for processing, has convenient installation and disassembly, reduces the probability of test failures, increases the stability of the test process, saves test time, and reduces test costs. Description of the Drawings

[0020] This specification expounds the complete and enlightening disclosure content of this application for those skilled in the art, including its best implementation mode. This specification refers to the drawings, in which:

[0021] Figure 1 It is a schematic diagram of a bushing swing wear life test tooling provided by an embodiment of the present utility model.

[0022] Reference Signs:

[0023] 1, nut; 2, retaining ring; 3, left support sleeve; 4, left support bearing; 41, inner ring of left support bearing; 42, roller of left support bearing; 43, outer ring of left support bearing; 5, bushing; 6, pressing plate; 7, right support bearing; 71, inner ring of right support bearing; 72, roller of right support bearing; 73, outer ring of right support bearing; 8, right support sleeve; 9, internal hexagonal screw; 10, stepped shaft; 11, right support seat; 12, left support seat; 13, first assembly gap; 14, second assembly gap. Detailed Embodiments

[0024] Reference will now be made in detail to embodiments of the present application, and one or more examples of the embodiments of the present application will be illustrated in the drawings. Each example is provided for the purpose of explaining the present application and not for limiting the present application. In fact, those skilled in the art will clearly understand that various modifications and variations can be made to the present application without departing from the scope or spirit of the present application. For example, features described or illustrated as part of one embodiment can be used with another embodiment to produce yet another embodiment. As used in this specification, the terms "first", "second", etc. can be used interchangeably to distinguish one component from another component and are not intended to indicate the position or importance of each component. As used in the specification, unless the context clearly indicates otherwise, the terms "a", "an", "the" and "said" are intended to mean the presence of one or more elements. The terms "comprising", "comprises" and "having" are intended to be inclusive and mean that there may be other elements in addition to the listed elements.

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the prior art, a swing wear life test requires adding an inner ring (abrasion-resistant ring), and the function of the abrasion-resistant ring is similar to that of the inner ring of the spherical plain bearing. However, since the inner diameter of the bushing 5 is fixed, if the abrasion-resistant ring is added, the diameter of the mandrel of the experimental tooling must be reduced, which will reduce the strength of the shaft. If the prior art is adopted, the diameter of the shaft needs to be reduced while the load borne is higher than that of the spherical plain bearing with the same inner diameter, which will result in insufficient strength of the shaft. To address the above technical problems, Figure 1 The structural block diagram of the bushing swing wear life test tooling according to an embodiment of the present invention is shown, as Figure 1 shown, the bushing swing wear life test tooling mainly includes: a stepped shaft 10, a left support sleeve 3, a right support sleeve 8, a left support bearing 4, a right support bearing 7, a left support seat 12, a right support seat 11, and a pressing plate 6.

[0027] In one embodiment, a left support bearing 4 is installed in a left support seat 12, and a right support bearing 7 is installed in a right support seat 11; a left support sleeve 3 is installed in the left support bearing 4, and a right support sleeve 8 is installed in the right support bearing 7; the stepped shaft 10 has a left-side thread, an intermediate shoulder, and a right-side shoulder, and the stepped shaft 10 passes through the right support sleeve 8, the bushing 5 to be tested installed in the pressure plate 6, and the left support sleeve 3 in sequence; the left support sleeve 3 is locked with the intermediate shoulder of the stepped shaft 10 through the left-side thread of the stepped shaft 10, the nut 1, the retaining ring 2, and the inner ring of the left support bearing 4; the right support sleeve 8 is locked with the right-side shoulder of the stepped shaft 10 through the bolt structure and the inner ring of the right support bearing 7; a cubic structure is arranged on the right side of the stepped shaft 10 for connecting with the drive system.

[0028] The bushing swing wear life test fixture proposed in the embodiment of the present application directly performs a wear swing test on the stepped shaft 10 against the bushing 5 without reducing the diameter of the stepped shaft 10, thereby maintaining the rigidity and strength of the stepped shaft 10, and ensuring that it can withstand large loads and torques, thereby improving the reliability of the test. The stepped shaft 10 has threads on its shaft head and shoulders on its shaft. The left support sleeve 3 and the left support bearing 4 are locked with the shoulder in the middle of the stepped shaft 10 through the nut 1 and the retaining ring 2. The right shoulder of the stepped shaft 10 has four evenly distributed through holes, and the right end face of the right support sleeve 8 has four evenly distributed threaded holes, which are locked with the threaded holes through the through holes on the right shoulder of the stepped shaft 10 through the hexagon socket screw 9. The right support sleeve 8 and the right support bearing 7 are connected and locked with the threaded holes of the right support sleeve 8 through the through holes of the right shoulder of the stepped shaft 10 through the hexagon socket screw 9. The periodic swing between the test fixtures is achieved through friction. The driving system drives the stepped shaft 10 to periodically swing the bushing 5 to implement a swing wear test.

[0029] The bushing swing wear life test tool proposed in the embodiment of the present application solves the problem that the swing shaft strength is not sufficient to meet the test strength during the bushing swing wear life test. The stepped shaft 10 is used, and there is no need to install a grinding ring. The bushing 5 is directly subjected to swing wear by the stepped shaft 10, which increases the diameter of the shaft in disguise, improves the rigidity and strength of the test core shaft, and ensures that the support is stably locked through the shoulder design.

[0030] In one embodiment, a first assembly gap 13 is provided between the left end face of the left support sleeve 3 and the right end face of the retaining ring 2, and the first assembly gap 13 prevents the left support sleeve 3 and the retaining ring 2 from directly contacting each other. The first assembly gap 13 is used to lock the left support sleeve 3 and the retaining ring 2 through the nut and thread structure of the stepped shaft 10. By providing the first assembly gap 13, it is ensured that the left support sleeve 3 and the retaining ring 2 can be locked when combined. In a specific embodiment, the first assembly gap range can be set to 0.5-1 mm.

[0031] In one embodiment, a second assembly gap 14 is provided between the right end face of the right support sleeve 8 and the shoulder end face on the right side of the stepped shaft 10; the second assembly gap 14 enables the right support sleeve 8 and the right shoulder of the stepped shaft 10 not to be in direct contact, and the second assembly gap 14 is used to lock the right support sleeve 8 and the right shoulder of the stepped shaft 10 through a bolt and screw hole structure. By providing the second assembly gap 14 in the embodiment of the present application, it is ensured that the right support sleeve 8 and the right shoulder assembly of the stepped shaft 10 can be locked when combined. In a specific embodiment, the range of the second assembly gap can be set to 0.5 - 1 mm.

[0032] In one embodiment, through holes evenly distributed are provided on the shoulder end face on the right side of the stepped shaft 10, and corresponding threaded holes evenly distributed are provided on the right end face of the right support sleeve 8. The right support sleeve 8 is locked with the right shoulder of the stepped shaft 10 through bolts. By the design of the evenly distributed through holes and bolt threaded holes in the embodiment of the present application, it is ensured that the bolt locking force is evenly distributed, improving the connection strength and stability of the entire test body.

[0033] In one embodiment, at least 2 evenly distributed through holes are provided on the right end face of the stepped shaft 10; at least 2 corresponding evenly distributed threaded holes are provided on the right end face of the right support sleeve 8.

[0034] In one embodiment, 4 evenly distributed through holes are provided on the right end face of the stepped shaft 10; 4 corresponding evenly distributed threaded holes are provided on the right end face of the right support sleeve 8.

[0035] In one embodiment, the left support bearing 4 includes a left support bearing inner ring 41, left support bearing rollers 42, and a left support bearing outer ring 43.

[0036] In one embodiment, the right support bearing 7 includes a right support bearing inner ring 71, right support bearing rollers 72, and a right support bearing outer ring 73.

[0037] Those skilled in the art can understand that the 2 evenly distributed threaded holes and the 4 evenly distributed threaded holes are examples of the embodiments. In specific embodiments, 3, 6, 8 evenly distributed threaded holes can also be designed. By designing different numbers of evenly distributed through holes and threaded holes in the embodiments of the present application, different strength and stability requirements can be met according to actual experimental requirements.

[0038] In one embodiment, the stepped shaft 10 radially locks the left support sleeve 3, the inner ring of the left support bearing 4, and the retaining ring 2 through the shoulder in the middle with a nut 1 to the left end thread of the stepped shaft 10. The locking structure is used to limit the radial displacement of the components and improve the axial stability. By the combined design of the thread and the nut 1 in the embodiment of the present application, the components are firmly locked to avoid radial displacement or loosening.

[0039] In one embodiment, the right support seat 11 is fixedly connected to the outer ring of the right support bearing 7, and the left support seat is fixedly connected to the outer ring of the left support bearing 4. The left support seat and the right support seat 11 are connected to the fixed base to achieve the limit installation of the overall tooling. Through the limit installation design in the embodiment of the present application, the stability of the tooling during the high-load swing process is ensured.

[0040] In one embodiment, the drive system realizes periodic swing through the right-side cuboid structure of the stepped shaft 10. The drive devices of the drive system include but are not limited to servo motors and hydraulic cylinders. Among them, the servo motor is suitable for high-frequency and low-load tests, and the hydraulic cylinder is suitable for low-frequency and high-load tests. By providing two drive methods of servo motors and hydraulic cylinders in the embodiment of the present application, the test requirements of different frequencies and loads are adapted.

[0041] In one embodiment, the pressing plate 6 is installed in the middle part of the stepped shaft 10 and is used to fix the bushing 5. The pressing plate 6 and the bushing 5 are in a static state during the test. The third assembly gap between the pressing plate and the bushing is controlled within: 0.005 - 0.025 mm, and the fourth assembly gap between the bushing and the swing shaft is 0.013 - 0.038 mm. Generally, the life swing test tooling of the bushing does not allow installation using temperature difference. Therefore, using clearance fit is beneficial to the installation and disassembly between the bushing toolings. However, too large a gap will affect the actual test. Therefore, after referring to the standards and actual verification, the above-mentioned fit gap has good effects during the test.

[0042] In one embodiment, the pressing plate 6 serves as an external force loading part and applies a radial dynamic load to the bushing 5; the stepped shaft 10 serves as a rotating part, and the stepped shaft swings periodically to realize the wear life test of the bushing. In the embodiment of the present application, a radial dynamic load is applied through the loading component, combined with the periodic swing of the stepped shaft 10, to realize the simulation test of the actual working conditions of the bushing 5. In one embodiment, through multiple test verifications, the applicable range of this set of tooling is: bushing bearings with an inner diameter of 6 - 20 mm.

[0043] In one embodiment, the bolt structure includes hexagon socket head cap screws and square head bolts.

[0044] In one embodiment, the left support bearing 4 and the right support bearing 7 include tapered roller bearings.

[0045] The usage method of the tooling provided by the embodiment of the utility model is as follows: Install the bushing 5 into the pressure plate 6, install the left support bearing 4 into the left support seat 12, install the right support bearing 7 into the right support seat 11, install the left support sleeve 3 into the left support bearing 4, install the right support sleeve 8 into the right support bearing 7, and sequentially pass the stepped shaft 10 through the right support sleeve 8, the bushing 5, and the left support sleeve 3. The right support sleeve 8 is locked with the right shaft shoulder of the stepped shaft 10 through the hexagon socket screw 9. The left end face of the right shaft shoulder of the stepped shaft 10 contacts the inner ring 71 of the right support bearing 7 and does not contact the right end face of the right support sleeve 8.

[0046] Install the nut 1 and the retaining ring 2 onto the shaft head. The nut 1 and the retaining ring 2 lock the shaft shoulder among the left support bearing 4, the left support sleeve 3, and the stepped shaft 10. When conducting the swing wear test of the bushing 5, the loading system applies a radial dynamic load to the bushing 5 through the pressure plate 6. The driving system is connected to the cube at the right side of the stepped shaft 10 to drive the stepped shaft 10 to swing periodically. The left end face of the shaft shoulder at the middle of the stepped shaft 10 drives the left support sleeve 3 to swing periodically through friction. The left support sleeve 3 drives the left support bearing 4 to swing periodically through friction. The right side of the stepped shaft 10 drives the right support sleeve 8 to swing through the tightening force of the hexagon socket screw 9. The right support sleeve 8 drives the right support bearing 7 to swing periodically through friction.

[0047] The driving system is connected to the cube at the right side of the stepped shaft 10 to drive the stepped shaft 10 to swing periodically, and the driving system provides the periodic swing function. The specific process of realizing the swing is described as follows:

[0048] I. Right side: First, the driving system drives the stepped shaft 10 to swing. The right shaft shoulder of the stepped shaft 10 is locked with the right support sleeve 8 and the inner ring of the right support bearing 7 through the hexagon socket bolt. During the swinging process of the stepped shaft 10, it drives the hexagon socket screw 9 to swing. The hexagon socket bolt drives the right support sleeve 8 to swing. At the same time, there is also the friction force applied by the locking mechanism. The friction force for locking the right support sleeve 8 and the inner ring of the right support bearing 7 drives the inner ring of the right support bearing 7 to swing. The friction force generated by locking the right shaft shoulder of the stepped shaft 10 and the inner ring of the right support bearing 7 also drives the inner ring of the right support bearing 7 to swing.

[0049] II. Left side: The nut 1 locks and presses the retaining ring 2 with the shaft shoulder at the middle of the stepped shaft 10. The retaining ring 2 locks the inner ring of the left support bearing 4. The inner ring of the left support bearing 4 locks the left support sleeve 3. The position bearing the locking force is the shaft shoulder at the middle of the stepped shaft 10. The driving system swings the stepped shaft 10. The shaft shoulder at the middle of the stepped shaft 10 generates friction to drive the left support sleeve 3 to swing. The left support sleeve 3 drives the inner ring of the left support bearing 4 to swing through friction. The stepped shaft 10 drives the nut 1 to rotate. The friction force generated by locking the nut 1 and the retaining ring 2 drives the retaining ring 2 to swing. The friction force generated by locking the retaining ring 2 and the inner ring of the left support bearing 4 drives the inner ring of the left support bearing 4 to swing.

[0050] 3. The nut 1, the retaining ring 2, the left support bearing inner ring 41 of the left support bearing 4, the left support sleeve 3 and the right support sleeve 8, the right support bearing inner ring 71 of the right support bearing 7, the hexagon socket screw 9 and the stepped shaft 10 swing synchronously together.

[0051] The embodiment of the present application adopts a set stepped shaft design to achieve wear on the bushing, which requires a structure to perform periodic swinging relative to the bushing. Referring to the wear test of the spherical bearing, it is to drive the inner ring to perform swinging wear on the outer ring. For the wear test of the bushing, if the swinging wear method of the spherical bearing is referred to, an "inner ring" must be added to perform swinging wear on the bushing. Since the inner diameter of the bushing is fixed, the diameter of the swinging shaft must be reduced. During the actual test process itself, the load borne by the bushing with the same inner diameter is greater than that of the spherical bearing. If a tooling design similar to that of the spherical bearing wear test is adopted, the strength of the shaft will be reduced while the load increases, resulting in fatigue fracture of the shaft before the test is completed. However, if the shaft diameter is reduced while maintaining the strength of the shaft under the test conditions, and the support bearings on both sides can be locked without adding an "inner ring" (wearing ring), if the support bearing cannot be limited and the inner ring of the support bearing is locked with the swing shaft, the swing shaft will cause friction with the support sleeve on the support bearing during the swinging process, and it will be impossible to perform wear tests on the bushing alone. The use of a stepped shaft can avoid these situations and at the same time achieve swing wear on the bushing, which is the advantage of the present invention.

[0052] The utility model adopts the technical solution of a stepped shaft to increase the rigidity and strength of the stepped shaft in disguise, directly drives the stepped shaft to swing and wear the bushing, and can easily lock the supporting bearings on the left and right sides on the stepped shaft respectively. The structure is convenient and quick to disassemble and replace the test piece, and the test piece can be easily replaced by removing the left nut 1.

[0053] The bushing 5 in the embodiment of the present application is not fixed, nor does it bear the clamping force. This clamping method is different from the inner ring of the spherical bearing in the prior art. Instead, it adopts a stepped shaft structure to directly clamp the support bearings on the left and right sides to the stepped shaft respectively. The advantage is that it does not reduce the diameter of the shaft, which in disguise enhances the strength of the shaft and enables better completion of the test.

[0054] The driving system of the present application can be a swing machine, which is connected to the cubic end of the stepped shaft 10. The test process relies on friction to achieve periodic swing, and uses friction to transmit motion, avoiding the impact and wear of the key connection, reducing the failure rate, and improving the stability of the system.

[0055] The tooling of the present utility model has undergone swing wear tests at high temperature of 165°C and low temperature of -55°C respectively. The results show that it has good wear resistance and structural strength. In the high-temperature environment (165°C), the tooling bears a load of 89.3 kN, completes 25,000 swings at a swing frequency of 0.2 Hz and a swing angle of 25°. During the test, the temperature of the bushing gradually rises and finally approaches 165°C. The wear amount increases with the number of swings and reaches about 0.12 mm at the end of the test, showing relatively stable wear resistance characteristics overall. In the low-temperature environment (-55°C), the tooling bears a load of 66.9 kN and completes 100,000 swings with the same swing parameters. The wear amount increases linearly with the number of swings and finally reaches about 0.28 mm, which is much higher than the wear amount in the high-temperature test, indicating that low temperature may exacerbate the wear of the material. The test data show that this tooling has good heat resistance and a stable wear trend in the high-temperature environment. In the low-temperature environment, although the wear amount increases, the overall structure remains intact without fracture or failure.

[0056] Compared with the tooling before improvement in this center, the swing bearing load position fractured during the normal-temperature test, resulting in the termination of the test. However, the tooling of the present utility model can still complete a complete test under extreme temperature conditions, indicating that its strength and wear resistance have been significantly improved. Especially in the low-temperature environment, this tooling can still withstand long-time high-load swings without structural damage, demonstrating excellent environmental adaptability and reliability. The improvement of the present utility model effectively enhances the durability of the tooling under extreme working conditions, ensures its stable operation in high and low temperature environments, and has high engineering application value.

[0057] The description of the present utility model is given for purposes of illustration and description, and is not intended to be exhaustive or to limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better explain the principles of the present utility model and its practical application, and to enable those of ordinary skill in the art to understand the present utility model and design various embodiments with various modifications suitable for a particular purpose.

[0058] Although the embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A bushing swing wear life test tooling, characterized in that Comprising: A stepped shaft, a left support sleeve, a right support sleeve, a left support bearing, a right support bearing, a left support seat, a right support seat and a pressing plate. Wherein, The left support bearing is installed inside the left support seat, and the right support bearing is installed inside the right support seat; The left support sleeve is installed inside the left support bearing, and the right support sleeve is installed inside the right support bearing; The stepped shaft has a left-side thread, a middle shaft shoulder, and a right-side shaft shoulder. The stepped shaft sequentially passes through the right support sleeve, the bushing to be tested installed inside the pressing plate, and the left support sleeve. The left support sleeve is locked with the middle shaft shoulder of the stepped shaft through the left-side thread of the stepped shaft, a nut, a retaining ring, and the inner ring of the left support bearing. The right support sleeve is locked with the right-side shaft shoulder of the stepped shaft through a bolt structure and the inner ring of the right support bearing. A cube structure is provided on the right side of the stepped shaft for connection with the drive system.

2. The bushing swing wear life test tooling according to claim 1, wherein: A first assembly gap is provided between the left-side end face of the left support sleeve and the right-side end face of the retaining ring, and the first assembly gap is used to lock the left support sleeve and the retaining ring; And / or A second assembly gap is provided between the right-side end face of the right support sleeve and the shaft shoulder end face on the right side of the stepped shaft; the second assembly gap is used to lock the right support sleeve and the shaft shoulder on the right side of the stepped shaft.

3. The bushing swing wear life test tooling according to claim 1, wherein: Uniformly distributed through holes are provided on the shaft shoulder end face on the right side of the stepped shaft. Corresponding uniformly distributed threaded holes are provided on the right-side end face of the right support sleeve. The right support sleeve is locked with the right-side shaft shoulder of the stepped shaft through bolts.

4. The bushing swing wear life test tooling according to claim 3, wherein: At least 2 uniformly distributed through holes are provided on the right-side end face of the stepped shaft; Corresponding at least 2 uniformly distributed threaded holes are provided on the right-side end face of the right support sleeve; And / or 4 uniformly distributed through holes are provided on the right-side end face of the stepped shaft; Corresponding 4 uniformly distributed threaded holes are provided on the right-side end face of the right support sleeve.

5. The bushing swing wear life test tooling according to claim 1, wherein: The stepped shaft locks the left support sleeve, the inner ring of the left support bearing, and the retaining ring through the middle shaft shoulder in the radial direction with the thread of the stepped shaft and a nut, and the locking structure is used to limit the radial displacement of the components and improve the axial stability.

6. The bushing swing wear life test tooling according to claim 1, wherein: The right support seat is fixedly connected to the outer ring of the right support bearing. The left support seat is fixedly connected to the outer ring of the left support bearing. The left support seat and the right support seat are connected to a fixed base to realize the limit installation of the overall tooling.

7. The bushing swing wear life test tooling according to claim 1, wherein: The drive system realizes the periodic swing of the stepped shaft through the cube structure on the right side of the stepped shaft, and the driving devices of the drive system include but are not limited to servo motors and hydraulic cylinders. Among them, the servo motor is applicable to high-frequency and low-load tests, and the hydraulic cylinder is applicable to low-frequency and high-load tests.

8. The bushing swing wear life test tooling according to claim 1, characterized in that : The pressing plate is installed at the middle position of the stepped shaft and is used to fix the bushing. The pressing plate and the bushing are in a static state during the test.

9. The bushing swing wear life test tooling according to claim 1, wherein: The pressing plate serves as an external force loading component to apply a radial dynamic load to the bushing.

10. The bushing swing wear life test tooling according to claim 1, wherein, Including: The bolt structure includes an internal hexagon bolt and a square head bolt. And / or The left support bearing and the right support bearing include tapered roller bearings.

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