Gear fatigue testing device and testing method

Abstract

The invention provides a gear fatigue testing device and method, and relates to the technical field of testing. The device comprises a supporting body, a first rotating shaft, a fixed mounting part, a first driving part and a second driving part, the first rotating shaft is fixedly connected with the supporting body; the fixed mounting part is arranged on the supporting body and is used for connecting and fixing a to-be-detected gear and enabling the to-be-detected gear to be coaxial with the first rotating shaft; the first driving part is movably arranged on the supporting body and rotationally connected with the first rotating shaft, the output end of the first driving part is connected with a loading gear, and the rotating axis of the loading gear is parallel to the axis of the first rotating shaft; the second driving part is connected with the supporting body, the output end of the second driving part is connected with one end of the swinging part, and the other end of the swinging part is rotationally connected with the first driving part; wherein the loading gear and the to-be-tested gear can be engaged and disengaged in a reciprocating manner, and the first driving part can output a preset rotating torque to the loading gear. Therefore, the gear fatigue test device can realize the fatigue test of the gear.

Description

Technical Field

[0001] The present invention relates to the field of testing technology, and in particular to a gear fatigue testing device and a testing method. Background Art

[0002] Ceramic gears are widely used in many industries such as aerospace, automobile manufacturing, chemical production, food processing and packaging, pharmaceuticals, textiles, precision instruments, and medical equipment due to their advantages such as high wear resistance, high temperature resistance, corrosion resistance, electromagnetic compatibility, low noise, and the ability to run without lubrication.

[0003] However, due to the brittle nature of ceramics, there is a lack of a plastic deformation stage. Fatigue fracture of ceramic materials often occurs when cracks initiate at surface or internal defects and expand to fracture under the action of stress concentration. Moreover, the crack propagation rate is affected by the fracture toughness of the material, loading conditions and environmental factors, and fracture often manifests as rapid failure.

[0004] Therefore, it is necessary to test the fatigue resistance of ceramic gears. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a gear fatigue testing device and testing method, so as to perform fatigue testing on gears accurately and at low cost.

[0006] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] The first aspect of the present application provides a gear fatigue testing device:

[0008] Support body;

[0009] a first rotating shaft, the first rotating shaft being fixedly connected to the supporting body;

[0010] a fixed mounting portion, the fixed mounting portion being provided on the support body and being used to connect and fix the gear to be tested, and to make the gear to be tested coaxial with the first rotating shaft;

[0011] a first driving unit, the first driving unit being movably disposed on the support body and rotatably connected to the first rotating shaft, an output end of the first driving unit being connected to a loading gear, a rotation axis of the loading gear being parallel to an axis of the first rotating shaft;

[0012] a second driving part, the second driving part being connected to the supporting body, an output end of the second driving part being connected to one end of the swinging part, and the other end of the swinging part being rotatably connected to the first driving part;

[0013] Among them, the second driving part can drive the swinging part to drive the first driving part to swing back and forth on the support body with the first rotating shaft as the axis, so that the loading gear and the gear to be measured are reciprocally engaged and disengaged, and the first driving part can output a preset size torque to the loading gear when the loading gear is engaged with the gear to be measured.

[0014] In some embodiments, in the aforementioned gear fatigue testing device, the support body comprises:

[0015] The first support plate is arranged horizontally, the first rotating shaft is arranged vertically and one end is fixedly connected to the bottom of the first support plate, the fixed installation portion is arranged on the top of the first support plate, and the center line of the fixed installation portion is colinear with the axis of the first rotating shaft.

[0016] In some embodiments, in the aforementioned gear fatigue testing device, the fixed mounting portion includes:

[0017] a base connected to the top surface of the first support plate;

[0018] A fastener is connected to the base, fixes the gear to be measured between the base and the fastener, and makes the measured tooth of the gear to be measured extend toward the loading gear.

[0019] In some embodiments, in the aforementioned gear fatigue testing device, a mounting shaft is provided at the center of the base protruding away from the first support plate, and the mounting shaft is provided with an external thread;

[0020] The fastener has a central hole with an internal thread, and the fastener can be threadedly connected to the mounting shaft.

[0021] In some embodiments, in the aforementioned gear fatigue testing device, the first driving unit includes:

[0022] A drive motor and a clutch, wherein the drive motor and the clutch are both movably connected to the support body, the clutch input end is connected to the output end of the drive motor, and the clutch output end is connected to the loading gear;

[0023] Wherein, the driving motor and / or the clutch are rotationally connected to the first rotating shaft, and are rotationally connected to the other end of the swinging part.

[0024] In some embodiments, in the aforementioned gear fatigue testing device, the first driving unit further comprises:

[0025] A test box, one side of which is open, the drive motor, the clutch and the loading gear are arranged in the test box and are all connected to the test box, the test box is movably connected to the support body, the test box is rotatably connected to the first rotating shaft, and the test box is rotatably connected to the other end of the swinging part.

[0026] In some embodiments, in the aforementioned gear fatigue testing device, the support body comprises:

[0027] A second support plate is arranged horizontally, an upper surface of the second support plate is provided with an arc-shaped slide rail, a bottom of the test box is provided with a slider, the test box is arranged on the second support plate, and the arc-shaped slide rail and the slider are slidably matched.

[0028] In some embodiments, in the aforementioned gear fatigue testing device, the support body includes a third support plate disposed horizontally;

[0029] The swinging part includes a crank and a connecting rod, one end of the crank is rotatably connected to the third support plate, the other end of the crank is connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the first driving part;

[0030] The output end of the second driving part is drivingly connected to one end of the crank.

[0031] In some embodiments, the aforementioned gear fatigue testing device further includes:

[0032] a first sensor controller and a second sensor controller, wherein the first sensor controller and the second sensor controller are both connected to the first driving part;

[0033] The first sensor controller is provided at the position of the third support plate corresponding to the connection between the crank and the connecting rod when the crank and the connecting rod move to a coincident collinear position; the second sensor controller is provided at the position of the third support plate corresponding to the connection between the crank and the connecting rod when the crank and the connecting rod move to a non-coincident collinear position;

[0034] wherein, the crank and the connecting rod move to a coincident collinear position, the loading gear meshes with the gear to be measured, the first sensor controller detects the connection position of the crank and the connecting rod, the first sensor controller sends a start signal to the first drive unit, and the first drive unit outputs the preset magnitude torque to the loading gear; the crank and the connecting rod move to a non-coincident collinear position, the loading gear is disengaged from the gear to be measured, the second sensor controller detects the connection position of the crank and the connecting rod, the second sensor controller controls the first drive unit to send a shutdown signal, and the first drive unit stops outputting the preset magnitude torque to the loading gear;

[0035] A revolution sensor is provided on the third support plate and adjacent to both the first sensor controller and the second sensor controller, for detecting the number of rotations of the swinging portion and serving as the number of meshings between the loading gear and the gear to be measured.

[0036] A second aspect of the present application provides a gear fatigue testing method, comprising:

[0037] Drive the loading gear to reciprocately engage and disengage with the gear to be tested;

[0038] When the loading gear is engaged with the gear to be tested, a preset rotational torque is provided to the loading gear, and the preset rotational torque acts on the gear to be tested through the loading gear;

[0039] When the loading gear is disengaged from the gear to be tested, stopping providing the preset rotational torque to the loading gear;

[0040] The number of meshing times of fatigue fracture of the gear to be tested and the preset magnitude of the rotational torque are recorded.

[0041] Compared with the prior art, the gear fatigue testing device provided by the present application can fix the gear to be tested coaxially with the first rotating shaft through a fixed mounting portion on the support body, connect the loading gear parallel to the axis of the first rotating shaft through a first driving portion, and the first driving portion can also be driven by the second driving portion, so that the first driving portion carries the loading gear to swing along the first rotating shaft toward or away from the gear to be tested, thereby realizing reciprocating engagement and disengagement between the loading gear and the gear to be tested, and when the loading gear and the gear to be tested are engaged, the first driving portion can also output a preset magnitude torque to the loading gear, thereby simulating the rotational engagement between the gears with a torque force, repeating the above actions, and further recording the value of the preset magnitude torque and the number of engagements when fatigue damage occurs to the gear to be loaded, so as to obtain fatigue test data. From the above, it can be seen that the gear fatigue testing device provided by the present application can not only realize gear fatigue testing but also has the following further technical effects:

[0042] By adjusting the preset torque output by the first drive unit, the force acting on the gear to be tested required for fatigue testing can be output, which facilitates the adjustment of the test torque and satisfies various gear fatigue tests with different force requirements.

[0043] It is also possible to stop the first driving unit from outputting a preset torque to the loading gear while releasing the meshing between the loading gear and the gear to be tested. This not only accurately simulates the meshing between the tooth surfaces of the gears, but also prevents the loading gear and the gear to be tested from rubbing against each other with force after the meshing is released. This ensures that the test process is consistent with the meshing and releasing states between the actual gears, further ensuring the accuracy of the test.

[0044] In addition, fatigue testing is performed by reciprocatingly driving the loading gear to mesh with the gear to be tested. There is no need to rotate the gear to be tested. Fatigue testing can be performed on multiple teeth of the gear to be tested separately, and multiple sets of fatigue data for one gear to be tested can be obtained, thereby reducing the sample consumption of the gear to be tested and the fatigue testing cost. It is especially suitable for fatigue testing of expensive ceramic gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0046] Figure 1 The figure schematically shows a first-view structural diagram of a gear fatigue testing device provided in the first embodiment of the present invention;

[0047] Figure 2Schematically shows a structural diagram of the gear fatigue testing device provided by the first embodiment of the present invention from a second viewing angle with all side walls of the support body removed;

[0048] Figure 3 The structure diagram of the gear fatigue testing device provided by the first embodiment of the present invention is schematically shown, excluding the second driving part and the swinging part;

[0049] Figure 4 The diagram schematically shows a structure diagram of the first driving part of the gear fatigue testing device provided by the first embodiment of the present invention connected to the loading gear and the first rotating shaft;

[0050] Figure 5 yes Figure 4 Another perspective of

[0051] Figure 6 The flowchart of the gear fatigue testing method provided in the second embodiment of the present invention is schematically shown.

[0052] Description of Figure Numbers:

[0053] 1. Support body; 11. First support plate; 12. Second support plate; 13. Third support plate; 2. First rotating shaft; 3. Fixed mounting portion; 31. Base; 32. Fastener; 33. Mounting shaft; 4. Gear to be tested; 5. First driving portion; 51. Driving motor; 52. Clutch; 53. Test box; 531. Limiting member; 6. Loading gear; 7. Second driving portion; 8. Swinging portion; 81. Crank; 82. Connecting rod; 9. First sensor controller; 10. Second sensor controller; 20. Speed sensor. DETAILED DESCRIPTION

[0054] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present application, but are not intended to limit the scope of the present application. The present application may be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0055] The present application provides these embodiments to make this application thorough and complete, and to fully express the scope of this application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0056] It should be noted that, in the description of this application, unless otherwise specified, "plurality" means greater than or equal to two; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicating directions or positional relationships, are intended solely to facilitate the description of this application and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0057] In addition, the terms "first," "second," and similar terms used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the word include the elements listed after the word, and do not exclude the possibility of other elements being included.

[0058] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0059] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0060] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0061] Gears are commonly used parts for power transmission, speed regulation, and direction adjustment. They are often required to have a certain degree of reliability, and material fatigue fracture is the most common type of gear damage. Therefore, fatigue testing of gears is necessary to deeply understand their performance. For gears with special properties such as ceramic gears and gears with special material characteristics, fatigue testing is even more necessary to understand the performance of gears made of this material, avoid uncontrollable situations during use, and cause unnecessary losses. It is also convenient to understand the performance of gears through fatigue testing so as to make more appropriate usage choices.

[0062] In the existing technology, common gear fatigue testing machines are mainly divided into two categories:

[0063] The first type of gear fatigue testing machine simulates actual working conditions by meshing the gear under test with a loaded gear until the gear fails due to fatigue, thereby collecting fatigue life data. This testing method requires replacing a new gear once fatigue failure occurs, which not only increases material costs but also prolongs testing time, placing a significant financial burden on companies.

[0064] The second type of gear fatigue testing machine applies a pulsating load only to a single tooth of a single gear to be tested in each test, and presses or clamps it with tools such as a pressure head and a fixture until the tooth fails due to fatigue, and then records the life data. Next, the position of the gear to be tested is adjusted, and similar fatigue life tests are performed on other teeth. This testing method cannot simulate the stress conditions of the gear tooth surface during the test. It simply applies force to one place and ignores the dynamic changes in force when the gears are engaged. This leads to a large difference between the test conditions and the actual working conditions, and the fatigue life data obtained is therefore inaccurate.

[0065] To solve the above problems, this application provides a new testing concept: the gear to be tested is fixed, and then the loading gear is reciprocally meshed with the gear to be tested. Then, a preset torque is output to the loading gear to load and mesh the loading gear with the gear to be tested, simulating the meshing force between actual gears. When the loading gear is released from meshing with the gear to be tested, the output of the preset torque is stopped, thus simulating the situation where the force is released after the actual gears are engaged. Furthermore, based on the above concept, a testing device and testing method shown in the following embodiments were developed and created:

[0066] Example 1

[0067] like Figure 1 and Figure 2 As shown, the first embodiment of the present application provides a gear fatigue testing device, comprising:

[0068] Support body 1, first rotating shaft 2, fixed mounting portion 3, first driving portion 5, second driving portion 7; the first rotating shaft 2 is fixedly connected to the support body 1; the fixed mounting portion 3 is provided on the support body 1, for connecting and fixing the gear to be measured 4, and making the gear to be measured 4 coaxial with the first rotating shaft 2; the first driving portion 5 is movably provided on the support body 1, and is rotationally connected to the first rotating shaft 2, the output end of the first driving portion 5 is connected to the loading gear 6, and the rotation axis of the loading gear 6 is parallel to the axis of the first rotating shaft 2; the second driving portion 7 is connected to the support body 1, the output end of the second driving portion 7 is connected to one end of the swinging portion 8, and the other end of the swinging portion 8 is rotationally connected to the first driving portion 5;

[0069] Among them, the second driving part 7 can drive the swinging part 8 to drive the first driving part 5 to swing back and forth on the support body 1 with the first rotating shaft 2 as the axis, so that the loading gear 6 and the gear to be measured 4 are reciprocally engaged and disengaged, and the first driving part 5 can output a preset size torque to the loading gear 6 when the loading gear 6 is engaged with the gear to be measured 4.

[0070] Specifically, the support body 1 is a supporting structure that realizes the relative positional relationship of the first rotating shaft 2, fixed mounting portion 3, first driving portion 5, second driving portion 7, etc. in the gear fatigue testing device, as well as the relative movement of each component. It is the frame of the gear fatigue testing device and can be designed adaptively as needed. The support body 1 can be a frame structure constructed from profiles, or a support structure formed by a combination of plates, beams, and frames, that is, as long as it can achieve the functions of supporting, fixing, and connecting the first rotating shaft 2, fixed mounting portion 3, first driving portion 5, second driving portion 7, etc. The support body 1 can be made of a metal material with a certain strength, such as steel or aluminum alloy.

[0071] The first rotating shaft 2 and the fixed mounting portion 3 are simultaneously connected to a certain connection point of the support body 1. The first rotating shaft 2 can be connected to the support body 1 at one end or at multiple locations. The fixed mounting portion 3 can be a clamp, a fixture, a screw-nut locking structure, or a slot structure, as long as it can secure the gear to be tested 4. However, it is important to note that after the fixed mounting portion 3 secures the gear to be tested 4, the gear to be tested 4 must be coaxial with the first rotating shaft 2, so that the first driving portion 5 can rotate about the axis of the gear to be tested 4 after being rotationally connected to the first rotating shaft 2.

[0072] The first drive unit 5 is used to output a torque and needs to be accurately controlled to achieve the adjustment and control of the output torque. The first drive unit 5 and the support body 1 can be connected by a rotational connection, a sliding connection, or a movable connection directly supported by the support body 1. The first drive unit 5 can be a servo motor, a stepper motor, a synchronous motor, etc., or the first drive unit 5 can be a combination of a drive motor 51 and a clutch 52. The output end of the first drive unit 5 and the loading gear 6 can be detachably connected, for example, by a keyway connection, a nut locking connection, etc., so that the loading gear 6 with appropriate parameters can be selected and replaced according to the test needs. However, it should be noted that no matter what the parameters of the loading gear 6 are, the hardness and strength of the loading gear 6 are required to be greater than the gear 4 to be tested. In addition, in order to achieve the meshing of the loading gear 6 and the gear 4 to be tested, the rotation axis of the output end of the first drive unit 5 must be parallel to the axis of the first rotating shaft 2, thereby making the rotation axis of the loading gear 6 parallel to the axis of the first rotating shaft 2.

[0073] The second driving part 7 is used to drive the swinging part 8 to swing back and forth, and it needs to be connected to the support body 1. The connection here can be a fixed connection or a detachable connection; the second driving part 7 can be a drive motor with controllable output, a combination of a drive motor and a reducer, an electric cylinder, or a hydraulic cylinder; the swinging part 8 needs to match the second driving part 7. When the second driving part 7 is a rotational output, the swinging part 8 can be a crank 81-connecting rod 82 mechanism. When the second driving part 7 is a linear output, the swinging part 8 can be a four-linkage 82 mechanism, a swing arm or a crank 81-connecting rod 82 mechanism.

[0074] Among them, a control unit can be set as needed to realize automatic control of the start and stop of the second drive unit 7, so as to realize the control of the first drive unit 5 with the loading gear 6 and the meshing and disengagement of the gear 4 to be tested. Of course, the start and stop of the second drive unit 7 can also be controlled by a manual control switch; when the loading gear 6 is engaged with the gear 4 to be tested, the control of the second drive unit 7 outputting a preset size torque can also be automatically controlled by the control unit set, or manually controlled, and the size of the preset size torque can be set in advance for the second drive unit 7, or can be adjusted manually or automatically by the control unit. It should be noted that there are many types of control units and simple control logics for realizing automatic control of the start and stop of the first drive unit 5 and the second drive unit 7, and no specific restrictions are made here.

[0075] The working method of the gear fatigue testing device provided in the present application is as follows: the gear to be tested 4 is coaxially fixed to the first rotating shaft 2 by the fixed mounting part 3 on the support body 1, and the loading gear 6 is connected to the axis of the first rotating shaft 2 in parallel by the first driving part 5. The first driving part 5 can also be driven by the second driving part 7, so that the first driving part 5 carries the loading gear 6 to swing in the direction of approaching or away from the gear to be tested 4 with the first rotating shaft 2 as the axis, thereby realizing reciprocating engagement and disengagement between the loading gear 6 and the gear to be tested 4, and when the loading gear 6 and the gear to be tested 4 are engaged, the first driving part 5 can also output a preset size torque to the loading gear 6, thereby simulating the rotational engagement between gears with torque action, repeating the above actions, and further recording the value of the preset size torque and the number of engagements when fatigue damage occurs to the gear to be loaded 6, so as to obtain fatigue test data.

[0076] From the above, it can be seen that the gear fatigue testing device provided by this application can not only realize gear fatigue testing but also has the following further technical effects:

[0077] By adjusting the preset torque output by the first drive unit 5, the force acting on the gear to be tested 4 required for fatigue testing can be output, which facilitates the adjustment of the test torque and meets the needs of gear fatigue tests with various force requirements; the first drive unit 5 can also stop outputting the preset torque of the loading gear 6 when the loading gear 6 and the gear to be tested 4 are released from engagement, which not only accurately simulates the engagement of the tooth surfaces between the gears, but also prevents the loading gear 6 and the gear to be tested 4 from mutual friction with force after the engagement is released, so that the test process is the same as the actual state of engagement and release of force between the gears, further ensuring the accuracy of the test; in addition, the reciprocating drive loading gear 6 and the gear to be tested 4 are used for fatigue testing, and there is no need to rotate the gear to be tested 4. Fatigue testing can be performed on multiple teeth of the gear to be tested 4 separately, and multiple sets of fatigue data of a gear to be tested 4 can be obtained, thereby reducing the sample consumption of the gear to be tested 4 and reducing the fatigue test cost, which is especially suitable for fatigue testing of expensive ceramic gears.

[0078] like Figure 1-Figure 3 As shown, in one embodiment, the support body 1 can be a supporting body in the form of a box having a bottom plate, a top plate and side plates. Figure 1 and Figure 2 It is just an example. The support body 1 can have all the side panels and top panels of the box. The figure shows that some side panels and top panels are hidden to show the internal structure. A first support plate 11 can be horizontally arranged in the support body 1. The first support plate 11 is connected to the side panels of the support body 1. The first rotating shaft 2 is vertically arranged and one end is fixedly connected to the bottom of the first support plate 11. The fixed installation part 3 is arranged on the top of the first support plate 11, and the center line of the fixed installation part 3 is colinear with the axis of the first rotating shaft 2.

[0079] Specifically, a gear fatigue testing device can implement various structures for meshing the loading gear 6 and the gear to be tested 4. For example, the axes of the loading gear 6 and the gear to be tested 4 can be arranged horizontally, vertically, or at a certain angle to the vertical. However, this application does not specifically limit the structure of the gear fatigue testing device for meshing the loading gear 6 and the gear to be tested 4. However, placing the gear to be tested 4 and the loading gear 6 horizontally and performing the meshing test is a structure that is convenient for implementing in a gear fatigue testing device, so this embodiment of the application will be described using this as an example.

[0080] Furthermore, in order to achieve horizontal placement of the gear to be tested 4 and the loading gear 6, that is, the axes of the two are arranged vertically, the support body 1 can be provided with a first support plate 11 horizontally, and the first support plate 11 needs to be firmly connected to the main body of the support body 1. The first rotating shaft 2 is vertically connected to the bottom of the first support plate 11. One end of the first rotating shaft 2 can be fixedly connected to the first support plate 11, such as by welding or threading; the first rotating shaft 2 can pass through the first support plate 11 to form a firm connection between the two, such as by welding after passing through or forming the two into one piece; or a bracket or sleeve can be provided on the first support plate 11, and then connected to at least one end of the first rotating shaft 2 to ensure a firm connection. Then the fixed mounting part 3 is installed on the top of the first support plate 11 opposite to the first rotating shaft 2, and the center line of the fixed mounting part 3 is kept coaxial with the axis of the first rotating shaft 2. Then, when the gear 4 to be measured is fixed by the fixed mounting part 3, the gear 4 to be measured can be coaxial with the first rotating shaft 2, and after the first driving part 5 is rotationally connected to the first rotating shaft 2, the first driving part 5 can drive the loading gear 6 to rotate around the axis of the gear 4 to be measured, thereby achieving engagement during reciprocating swing.

[0081] like Figure 1-Figure 3 As shown, in one embodiment, the fixed mounting portion 3 includes: a base 31 and a fastener 32, the base 31 is connected to the top surface of the first support plate 11; the fastener 32 can be connected to the base 31, fixing the gear to be measured 4 between the base 31 and the fastener 32, and making the measured teeth of the gear to be measured 4 extend toward the loading gear 6.

[0082] Specifically, the base 31 may be in the shape of a round pancake, and the bottom surface of the base 31 is attached to and firmly connected to the top surface of the first support plate 11 , for example, by welding, and the axis of the base 31 is coaxial with the first rotating shaft 2 .

[0083] A slot can be provided above the base 31, the center line of which is coaxial with the first rotating shaft 2. When the gear 4 to be tested is placed in the slot, the fastener 32 can be fastened to the slot to secure the gear 4 to be tested. It should be noted that an opening needs to be provided on the side of the slot facing the loading gear 6 so that the teeth to be tested of the gear 4 to be tested are exposed.

[0084] Alternatively, a mounting shaft 33 is provided at the center of the base 31 protruding away from the first support plate 11, and the mounting shaft 33 is provided with an external thread; the fastener 32 has a center hole, and the center hole has an internal thread, and the fastener 32 can be threadedly connected to the mounting shaft 33, and then the gear 4 to be tested can be tightened between the fastener 32 and the base 31 to achieve the fixation of the gear 4 to be tested; wherein, the fastener 32 can be an integrated structure or a split structure, that is, a pressing plate with a through hole plus a nut.

[0085] like Figure 1-Figure 5 As shown, in one embodiment, the first driving part 5 includes: a driving motor 51 and a clutch 52, the driving motor 51 and the clutch 52 are both movably connected to the support body 1, the input end of the clutch 52 is connected to the output end of the driving motor 51, and the output end of the clutch 52 is connected to the loading gear 6; wherein the driving motor 51 and / or the clutch 52 are rotationally connected to the first rotating shaft 2, and are rotationally connected to the other end of the swinging part 8.

[0086] Specifically, the present application introduces the first drive unit 5 in the form of a combination of a drive motor 51 and a clutch 52. The drive motor 51 can be a torque motor, a servo motor, a stepper motor, a synchronous motor, or other motors that can continuously output torque. The clutch 52 can be a magnetic powder clutch, a hydraulic coupling, a friction clutch, an electromagnetic clutch, a pneumatic clutch, or a hysteresis clutch. The output of the torque can be controlled by controlling the clutch 52. In this way, the first drive unit 5 can be conveniently controlled to achieve rapid and convenient adjustment of the output torque of a preset magnitude, and to facilitate the first drive unit 5 to be controlled to output or stop outputting the preset torque to the loading gear 6.

[0087] Furthermore, the first driving part 5 also includes: a test box 53, which is open on one side, and the driving motor 51, the clutch 52 and the loading gear 6 are arranged in the test box 53 and are all connected to the test box 53, the test box 53 is movably connected to the support body 1, the test box 53 is rotationally connected to the first rotating shaft 2, and the test box 53 is rotationally connected to the other end of the swinging part 8.

[0088] Specifically, the test box 53 can be in the shape of a rectangular parallelepiped as a whole and needs to have a certain strength. The side walls of the test box 53 can be connected to the drive motor 51. A fixed plate can be installed in the test box 53, connected to the side walls of the test box 53 and connected to the clutch 52 through the fixed plate. The top plate of the test box 53 can be connected to the loading gear 6. The bottom plate of the test box 53 can be movably connected to the support body 1. For example, the bottom plate of the test box 53 can be movably connected to the bottom plate of the support body 1, or to an additional support plate of the support body 1.

[0089] The configuration of the test box 53 enables the drive motor 51, clutch 52, and loading gear 6 to move as a whole, that is, the first drive unit 5 to move as a whole. This facilitates the control of the overall movement of the first drive unit 5 via the swing unit 8, improves the stability of the movement, and improves the accuracy of the trajectory of the driven movement. This ensures that each engagement between the loading gear 6 and the gear to be tested 4 is accurate and the engagement position is uniform. When the test gear contacts the limit device, the test gear cannot rotate, ensuring that the gears engage in the same position each time.

[0090] Furthermore, the test box 53 is also provided with a limit member 531, which is located between two adjacent teeth of the loading gear 6, and the position of the limit member 531 must ensure that it will not interfere with the torque output of the loading gear 6 after the loading gear 6 is engaged with the gear 4 to be tested. The function of the limit member 531 is to limit the rotation of the loading gear 6 when the loading gear 6 is disengaged from the gear 4 to be tested, so as to ensure that the loading gear 6 engages with the gear 4 to be tested at the same position each time, thereby ensuring the accuracy of the fatigue test.

[0091] like Figure 1 and Figure 2 As shown, in one embodiment, taking the above-mentioned box-shaped support body 1 as an example, it can also include: a horizontally arranged second support plate 12, the upper surface of the second support plate 12 is provided with an arc-shaped slide rail (not shown in the figure), and the bottom of the test box 53 is provided with a slider (not shown in the figure). The test box 53 is arranged on the second support plate 12, and the arc-shaped slide rail and the slider are slidably matched.

[0092] Specifically, it is important to note that the trajectory of the arcuate slide must be identical to the swing trajectory of the first drive unit 5 when driving the loading gear 6 to reciprocately mesh with the gear to be tested 4. That is, the trajectory of the arcuate slide is the swing trajectory of the first drive unit 5. In this way, the second support plate 12 not only effectively supports the first drive unit 5 in the vertical direction, but also, by adding a slider at the bottom of the test box 53 that is slidably connected to the arcuate slide of the second support plate 12, the trajectory of the swing motion is precisely refined, thereby improving the accuracy of the reciprocating meshing action during testing and enhancing test accuracy.

[0093] like Figure 1 and Figure 2 As shown, in one embodiment, taking the above-mentioned box-shaped support body 1 as an example, the support body 1 may further include a third support plate 13 arranged horizontally; the swinging portion 8 includes a crank 81 and a connecting rod 82 .

[0094] Specifically, the third support plate 13 can be located above the first support plate 11 , and the second drive unit 7 is located above the first support plate 11 ; the third support plate 13 can also be located below the first support plate 11 , and the second drive unit 7 is located below the first support plate 11 .

[0095] Among them, this application is introduced by taking the third support plate 13 below the first support plate 11 as an example. The third support plate 13 is connected to the side plate of the support body 1. The third support plate 13 serves as the supporting structure of the swinging part 8, so that the swinging part 8 swings back and forth in the horizontal direction, thereby driving the first driving part 5 to swing back and forth with the first rotating shaft 2 as the axis.

[0096] The swinging portion 8 of the present application can be a structure of a crank 81 and a connecting rod 82, wherein one end of the crank 81 is rotationally connected to the third support plate 13, the other end of the crank 81 is connected to one end of the connecting rod 82, and the other end of the connecting rod 82 is rotationally connected to the first driving portion 5, and the position where the other end of the connecting rod 82 is rotationally connected to the first driving portion 5 is opposite to the position where the first driving portion 5 is rotationally connected to the first rotating shaft 2. The two rotationally connected positions can be on two opposite side edges or two opposite side surfaces of the test box 53. The output end of the second driving portion 7 is drivingly connected to one end of the crank 81. The second driving portion 7 can be a combination of a driving motor 51 and a reducer. The connection between the driving motor 51 and the reducer can be a belt connection or a coupling connection. Similarly, the driving connection between the reducer and one end of the crank 81 can also be a belt connection or a coupling connection.

[0097] like Figure 1 and Figure 2 As shown, in one embodiment, the gear fatigue testing device further includes: a first sensor controller 9 and a second sensor controller 10, both of which are connected to the first driving part 5; the first sensor controller 9 is set at the position of the third support plate 13 corresponding to the connection between the crank 81 and the connecting rod 82 when the crank 81 and the connecting rod 82 move to the overlapping collinear position; the second sensor controller 10 is set at the position of the third support plate 13 corresponding to the connection between the crank 81 and the connecting rod 82 when the crank 81 and the connecting rod 82 move to the non-overlapping collinear position; wherein the crank 81 and the connecting rod 82 move to the overlapping collinear position, the loading gear 6 is engaged with the gear to be tested 4, and the first sensor controller 9 detects the connection position of the crank 81 and the connecting rod 82 The first sensor controller 9 sends a start signal to the first drive unit 5, and the first drive unit 5 outputs a preset size torque to the loading gear 6; the crank 81 and the connecting rod 82 move to a non-overlapping collinear position, and the loading gear 6 is disengaged from the gear 4 to be measured. The second sensor controller 10 detects the connection position of the crank 81 and the connecting rod 82, and the second sensor controller 10 controls the sending of a shutdown signal to the first drive unit 5, and the first drive unit 5 stops outputting the preset size torque to the loading gear 6; the speed sensor 20 is arranged on the third support plate 13 and is arranged at a position adjacent to the first sensor controller 9 and the second sensor controller 10, for detecting the number of rotations of the swinging part 8, and as the number of engagements of the loading gear 6 with the gear 4 to be measured.

[0098] Specifically, the first sensor controller 9 and the second sensor controller 10 can both be grating type controllers or contact type controllers; the revolution sensor 20 can be any type of sensor that can realize counting, which is not limited here.

[0099] The gear fatigue testing device of the present application may also include a controller as described above, which collects signals from the first sensor controller 9, the second sensor controller 10 and the speed sensor 20, and the controller is connected to the first drive unit 5 and the second drive unit 7. The controller receives signals from the first sensor controller 9, the second sensor controller 10 and the speed sensor 20, and controls the first drive unit and the second drive unit based on the signals from the first sensor controller 9 and the second sensor controller 10 to implement the above-mentioned fatigue test action, which will not be repeated here.

[0100] Example 2

[0101] like Figure 6 As shown, the second embodiment of the present application provides a gear fatigue testing method, which can be implemented by the device provided in the above-mentioned first embodiment, but is not limited to the device provided in the first embodiment. The gear fatigue testing method includes:

[0102] 201. Drive the loading gear to reciprocately engage and disengage with the gear to be tested.

[0103] Specifically, the gear to be tested can be fixed and its teeth to be tested can be exposed, and then the loading gear can be driven to move, and the driven loading gear can be moved closer to or farther from the gear to be tested, and meshing and disengagement can be achieved.

[0104] 202. When the loading gear is engaged with the gear to be tested, a preset rotational torque is provided to the loading gear, and the preset rotational torque is applied to the gear to be tested through the loading gear.

[0105] Specifically, when the loading gear meshes with the test gear, a suitable torque can be set based on the test requirements or operational needs of the gear under test. This means a preset torque can be applied to the loading gear, allowing the loading gear to apply the preset torque to the teeth of the gear under test. This preset torque can be a constant value, or it can be set to a variable value based on test needs, such as a variable torque during a single meshing operation, or a variable torque value after multiple meshing operations to simulate gear operation. This means the outputted preset torque can be controlled and adjusted in real time or non-real time based on test needs.

[0106] 203. When the loading gear and the gear to be tested are disengaged, the preset torque provided to the loading gear is stopped.

[0107] Specifically, stopping applying the preset torque when disengaging can avoid the loaded gear from causing wear and force on the gear to be tested during the return motion, accurately simulating the stress state of the gear teeth during operation, and ensuring the accuracy of the fatigue test.

[0108] 204. Record the number of meshing times and the preset torque at which the gear to be tested will fracture due to fatigue.

[0109] Specifically, the number of meshing times of fatigue fracture and the preset torque can be recorded manually or automatically by a controller that controls the movement of the loading gear and applies the torque.

[0110] From the above, it can be seen that the gear fatigue testing method provided by this application has the following technical effects:

[0111] Fatigue testing is performed by reciprocatingly driving the loading gear to mesh with the gear to be tested. This eliminates the need to rotate the gear to be tested, and allows fatigue testing to be performed on multiple teeth of the gear to be tested separately. This allows for the acquisition of multiple sets of fatigue data for one gear to be tested, thereby reducing sample consumption for the gear to be tested and reducing fatigue testing costs. This is particularly applicable to fatigue testing of expensive ceramic gears.

[0112] By applying torque to the gears during meshing, the tester accurately simulates the meshing of the gear teeth and facilitates adjustment of the applied torque. Furthermore, the tester stops applying torque when the loading gear is released from mesh with the gear under test, eliminating friction with applied force. This test method replicates the actual meshing and release conditions of the gears, ensuring test accuracy.

[0113] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A gear fatigue testing device, characterized in that: include: Support body; a first rotating shaft, the first rotating shaft being fixedly connected to the supporting body; a fixed mounting portion, the fixed mounting portion being provided on the support body and being used to connect and fix the gear to be tested, and to make the gear to be tested coaxial with the first rotating shaft; a first driving unit, the first driving unit being movably disposed on the support body and rotatably connected to the first rotating shaft, an output end of the first driving unit being connected to a loading gear, a rotation axis of the loading gear being parallel to an axis of the first rotating shaft; a second driving part, the second driving part being connected to the supporting body, an output end of the second driving part being connected to one end of the swinging part, and the other end of the swinging part being rotatably connected to the first driving part; Among them, the second driving part can drive the swinging part to drive the first driving part to swing back and forth on the support body with the first rotating shaft as the axis, so that the loading gear and the gear to be measured are reciprocally engaged and disengaged, and the first driving part can output a preset size torque to the loading gear when the loading gear is engaged with the gear to be measured.

2. The gear fatigue testing device according to claim 1, characterized in that: The support body comprises: The first support plate is arranged horizontally, the first rotating shaft is arranged vertically and one end is fixedly connected to the bottom of the first support plate, the fixed installation portion is arranged on the top of the first support plate, and the center line of the fixed installation portion is colinear with the axis of the first rotating shaft.

3. The gear fatigue testing device according to claim 2, characterized in that: The fixed installation portion includes: a base connected to the top surface of the first support plate; A fastener is connected to the base, fixes the gear to be measured between the base and the fastener, and makes the measured tooth of the gear to be measured extend toward the loading gear.

4. The gear fatigue testing device according to claim 3, characterized in that: A mounting shaft is provided at the center of the base protruding away from the first support plate, and the mounting shaft is provided with an external thread; The fastener has a central hole with an internal thread, and the fastener can be threadedly connected to the mounting shaft.

5. The gear fatigue testing device according to claim 1, characterized in that: The first driving unit includes: A drive motor and a clutch, wherein the drive motor and the clutch are both movably connected to the support body, the clutch input end is connected to the output end of the drive motor, and the clutch output end is connected to the loading gear; Wherein, the driving motor and / or the clutch are rotationally connected to the first rotating shaft, and are rotationally connected to the other end of the swinging part.

6. The gear fatigue testing device according to claim 5, characterized in that: The first driving unit further includes: A test box, one side of which is open, the drive motor, the clutch and the loading gear are arranged in the test box and are all connected to the test box, the test box is movably connected to the support body, the test box is rotatably connected to the first rotating shaft, and the test box is rotatably connected to the other end of the swinging part.

7. The gear fatigue testing device according to claim 6, characterized in that: The support body comprises: A second support plate is arranged horizontally, an upper surface of the second support plate is provided with an arc-shaped slide rail, a bottom of the test box is provided with a slider, the test box is arranged on the second support plate, and the arc-shaped slide rail and the slider are slidably matched.

8. The gear fatigue testing device according to claim 1, characterized in that: The support body includes a third support plate arranged horizontally; The swinging part includes a crank and a connecting rod, one end of the crank is rotatably connected to the third support plate, the other end of the crank is connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the first driving part; The output end of the second driving part is drivingly connected to one end of the crank.

9. The gear fatigue testing device according to claim 8, characterized in that: Also includes: a first sensor controller and a second sensor controller, wherein the first sensor controller and the second sensor controller are both connected to the first driving part; The first sensor controller is provided at the position of the third support plate corresponding to the connection between the crank and the connecting rod when the crank and the connecting rod move to a coincident collinear position; the second sensor controller is provided at the position of the third support plate corresponding to the connection between the crank and the connecting rod when the crank and the connecting rod move to a non-coincident collinear position; wherein, the crank and the connecting rod move to a coincident collinear position, the loading gear meshes with the gear to be measured, the first sensor controller detects the connection position of the crank and the connecting rod, the first sensor controller sends a start signal to the first drive unit, and the first drive unit outputs the preset magnitude torque to the loading gear; the crank and the connecting rod move to a non-coincident collinear position, the loading gear is disengaged from the gear to be measured, the second sensor controller detects the connection position of the crank and the connecting rod, the second sensor controller controls the first drive unit to send a shutdown signal, and the first drive unit stops outputting the preset magnitude torque to the loading gear; A revolution sensor is provided on the third support plate and adjacent to both the first sensor controller and the second sensor controller, for detecting the number of rotations of the swinging portion and serving as the number of meshings between the loading gear and the gear to be measured.

10. A gear fatigue testing method, characterized in that: include: Drive the loading gear to reciprocately engage and disengage with the gear to be tested; When the loading gear is engaged with the gear to be tested, a preset rotational torque is provided to the loading gear, and the preset rotational torque acts on the gear to be tested through the loading gear; When the loading gear is disengaged from the gear to be tested, stopping providing the preset rotational torque to the loading gear; The number of meshing times of fatigue fracture of the gear to be tested and the preset magnitude of the rotational torque are recorded.

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