CN114034585A - Spline fatigue test device - Google Patents
Spline fatigue test device Download PDFInfo
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- CN114034585A CN114034585A CN202111261556.2A CN202111261556A CN114034585A CN 114034585 A CN114034585 A CN 114034585A CN 202111261556 A CN202111261556 A CN 202111261556A CN 114034585 A CN114034585 A CN 114034585A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
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Abstract
The invention discloses a spline fatigue test device, and belongs to the technical field of gear part fatigue test devices. The invention comprises a tension-compression fatigue testing machine and a spline fatigue testing clamp. The spline fatigue test fixture comprises an external spline clamping mechanism, an internal spline position fine adjustment mechanism, an internal spline position coarse adjustment mechanism, a supporting mechanism and a fatigue testing machine connecting mechanism. According to the invention, a special spline fatigue testing machine is not needed, the requirement of the spline fatigue testing machine is reduced by increasing the spline fatigue testing clamp, namely, the spline fatigue testing machine is provided with the spline fatigue clamp, the tension and compression cyclic load of the tension and compression fatigue testing machine is converted into the rotation cyclic load between the internal spline and the external spline, the spline fatigue testing is realized, the spline fatigue testing is carried out on the tension and compression fatigue testing machine, the cost and the complexity of the spline fatigue testing can be reduced, and the spline fatigue testing precision can be improved. The invention has the characteristics of low test cost, high test precision and good applicability.
Description
Technical Field
The invention relates to a spline fatigue test device, and belongs to the technical field of gear part fatigue test devices.
Background
The spline is used as a commonly used connecting and transmission structure of shaft parts, is widely applied to the fields of vehicles, aerospace and the like, and meanwhile, because the cyclic load borne by the spline part is usually larger than that of other parts, the spline part preferentially generates fatigue failure and causes the failure of the whole part and even the whole equipment. In order to improve the reliability of the equipment, it is necessary to conduct experimental research and testing on the fatigue performance of the spline.
For larger parts such as gears, the gears are usually installed on a test platform through a clamp, and then a load is applied to the gears by using a loading piece so as to test the bending fatigue strength of single teeth of the gears. The spline is less for the gear, and its tooth height is less, and traditional gear fatigue test mechanism is difficult to exert fatigue load to its accuracy, simultaneously because the integral key shaft diameter is less, and the atress state of spline tooth at the during operation is more complicated than the gear wheel, and traditional fatigue test machine is difficult to accurate simulation, and simultaneously, current gear and spline fatigue test anchor clamps still easily appear the inhomogeneous phenomenon of loading force, lead to the test result inaccurate.
Disclosure of Invention
Aiming at the following problems in the prior art: (1) a special device for spline fatigue test is lacked; (2) the fatigue test results are inaccurate. The invention aims to provide a spline fatigue test device, which realizes a spline fatigue test by adding a spline fatigue test clamp on the basis of a tension and compression fatigue test machine and can improve the spline fatigue test precision. According to the invention, a special spline fatigue testing machine is not needed, the requirement of the spline fatigue testing machine is reduced by increasing the spline fatigue testing clamp, the spline fatigue test is carried out on the tension and compression fatigue testing machine, the cost and the complexity of the spline fatigue test can be reduced, and the spline fatigue testing precision can be improved.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a spline fatigue test device which comprises a tension-compression fatigue test machine and a spline fatigue test clamp.
Spline fatigue test anchor clamps are including external spline fixture, internal spline position fine-tuning, the coarse adjustment mechanism in internal spline position, supporting mechanism, fatigue testing machine coupling mechanism.
The external spline clamping mechanism is used for clamping an external spline and mainly comprises an external spline fastening bolt and an external spline fastening nut. The outer spline is located between two interior centre gripping arms, and outer spline center and have all around with interior centre gripping arm upper end complex through-hole, outer spline center through-hole is coaxial with interior centre gripping arm through-hole to it is fixed with interior centre gripping arm to pass interior centre gripping arm and outer spline through outer spline fastening bolt all around through-hole, when interior centre gripping arm rotates around the public axle, drives the outer spline and rotates simultaneously around the public axle.
The inner spline position fine adjustment mechanism is used for fine adjustment of the fit clearance of the inner spline and the outer spline and the interaction pressure of the inner spline and the outer spline so as to ensure that the inner spline and the outer spline are tightly matched in the fatigue test process. The inner spline position fine-tuning mechanism mainly comprises an inner spline left clamping block, an inner spline right clamping block, a first self-locking sliding block, a second self-locking sliding block, a sliding groove cover plate, a first self-locking sliding block positioning bolt and a sliding groove cover plate fastening bolt. The left clamping block right side of the internal spline is provided with a cross-shaped groove, a transverse groove of the cross-shaped groove is used for placing a first self-locking sliding block, and the lower part of a longitudinal groove of the cross-shaped groove is sequentially provided with the internal spline and a second self-locking sliding block from bottom to top. The lower end face of the first self-locking sliding block is an inclined plane, and the upper end face of the second self-locking sliding block is an inclined plane. And a threaded through hole for a first self-locking sliding block positioning bolt to pass through is processed in the center of the sliding groove cover plate. The first self-locking sliding block is driven to move back and forth by rotating and adjusting the positioning bolt of the first self-locking sliding block to move back and forth, the part inclined plane of the lower end surface of the first self-locking sliding block is matched with the inclined plane of the upper end surface of the second self-locking sliding block, the back and forth movement of the first self-locking sliding block is converted into the longitudinal up and down movement of the second self-locking sliding block, and the fit clearance between the internal spline and the external spline and the interaction pressure between the internal spline and the external spline are adjusted by the longitudinal up and down movement of the second self-locking sliding block so as to ensure that the internal spline and the external spline are tightly matched in the fatigue test process. The inclined plane angle of the lower end face of the first self-locking sliding block and the upper end face of the second self-locking sliding block in a matched mode is smaller than a friction angle, and therefore the self-locking of the inner spline position fine adjustment mechanism after the inner spline position fine adjustment mechanism moves to a preset position is guaranteed.
The friction angle is determined by the material static friction factor,
β＝arctan(f) (1)
where β is the friction angle and f is the static friction factor.
The inner spline position coarse adjustment mechanism is used for coarsely adjusting the longitudinal relative position of the inner spline and the outer spline. The inner spline position coarse adjustment mechanism mainly comprises an outer clamping arm, an inner spline left clamping block, an inner spline right clamping block, an inner spline position coarse adjustment sliding block, an inner spline position coarse adjustment mechanism fastening bolt and an inner spline position coarse adjustment mechanism fastening nut. The outer clamping arm is shared by the inner spline position coarse adjustment mechanism and the supporting mechanism. The left clamping block and the right clamping block of the internal spline are shared by the coarse adjustment mechanism and the fine adjustment mechanism of the position of the internal spline. And a guide rail groove for adjusting the left clamping block of the internal spline and the right clamping block of the internal spline to move up and down is processed on the outer clamping arm. The outer sides of the left clamping block and the right clamping block of the internal spline are fixedly connected with the coarse adjustment sliding block of the position of the internal spline respectively. The shape of the inner spline position coarse adjustment slide block is matched with the guide rail groove. The inner spline position coarse adjustment sliding block is driven to move up and down along the guide rail groove by a fastening bolt of the inner spline position coarse adjustment mechanism which moves up and down longitudinally, and the inner spline position coarse adjustment sliding block drives the inner spline left clamping block and the inner spline right clamping block to move up and down, so that the longitudinal relative position coarse adjustment of the inner spline and the outer spline is realized. After the left clamping block and the right clamping block of the internal spline move up and down to the preset position of coarse adjustment, the fastening bolt of the coarse adjustment mechanism of the position of the internal spline is matched and locked with the fastening nut of the coarse adjustment mechanism of the position of the internal spline.
For realizing the left grip block of internal spline, there is stepped regulation and cooperation stability of the right grip block of internal spline and outer clamp arm relative position, as preferred, the left grip block of internal spline, the processing of the right grip block outside of internal spline is used for with outer clamp arm complex wavy texture, the processing of outer clamp arm inboard is used for with the left grip block of internal spline, the right grip block complex texture of internal spline, realize the left grip block of internal spline through the mutually supporting between the texture, there is stepped regulation of the right grip block of internal spline and outer clamp arm relative position, and for the left grip block of internal spline, the right grip block of internal spline and the cooperation that provides more stable of outer clamp arm.
The supporting mechanism mainly comprises an outer clamping arm, an inner clamping arm and an inner and outer arm connecting device, so that the fixing of an inner spline sample and an outer spline sample is realized, and a tension-compression cyclic load in a tension-compression fatigue testing machine is converted into a rotation cyclic load between the inner spline and the outer spline, so that the stress state of the spline is closer to the actual working state. And through holes for the cylinder shafts of the fastening devices of the connecting mechanism of the fatigue testing machine to pass through are respectively processed at the lower end of the inner clamping arm and the upper end of the outer clamping arm. And through holes for the inner and outer arm connecting cylinder shafts of the inner and outer arm connecting device to pass through are respectively processed at the upper end of the inner clamping arm and the lower end of the outer clamping arm. By adjusting the included angle between the outer clamping arm and the inner clamping arm, the axis of the inner and outer arm connecting cylinder shaft is not coplanar with the cylinder shaft of the fatigue testing machine connecting mechanism fastening device, and the purpose of converting the up-and-down cyclic load of the cylinder shaft of the fatigue testing machine connecting mechanism fastening device into the rotary cyclic load of the outer clamping arm and the inner clamping arm around the axis of the inner and outer arm connecting cylinder shaft is achieved.
In order to realize the relative rotation between the inner clamping arm and the outer clamping arm and reduce the energy loss in the load transfer process, as the optimization, the inner and outer arm connecting device mainly comprises an inner and outer arm connecting cylinder shaft, an inner and outer arm fastening bolt, an inner and outer arm fastening nut, an inner and outer arm connecting bearing and an inner and outer arm connecting bearing gasket, the upper end of the inner clamping arm is processed with a lower counter bore which is coaxial with a through hole at the upper end of the inner clamping arm and matched with the outer ring of the inner and outer arm connecting bearing, the inner and outer arm connecting cylinder shaft penetrates through the through hole at the upper end of the inner clamping arm and the lower end of the outer clamping arm, the connection between the inner clamping arm and the outer clamping arm is realized through the inner and outer arm fastening bolt, the inner and outer arm fastening nut, the inner and outer arm connecting bearing and the inner and outer arm connecting bearing gasket, and the preset target of reducing the energy loss is reached.
The fatigue testing machine connecting mechanism is used for fixedly connecting the tension and compression fatigue testing machine and the spline fatigue testing clamp and transmitting the fatigue load of the tension and compression fatigue testing machine to the spline fatigue testing clamp. The fatigue testing machine connecting mechanism comprises an upper connecting mechanism and a lower connecting mechanism. Go up coupling mechanism and be used for connecting and draw and press fatigue testing machine anchor clamps and spline fatigue test anchor clamps, mainly constitute by last connecting rod and last connecting rod fastener, go up the connecting rod upper end and draw and press the fatigue testing machine and go up the anchor clamps cooperation, direct centre gripping is in drawing and pressing the fatigue testing machine and go up anchor clamps, realizes being connected with drawing and pressing the fatigue testing machine. Connecting mechanism is used for connecting and draws and presses anchor clamps and spline fatigue test anchor clamps under the fatigue test machine, mainly comprises lower connecting rod and lower connecting rod fastening device, connecting rod lower extreme and draw and press the fatigue test machine under the anchor clamps cooperation, direct centre gripping is in drawing and pressing the fatigue test machine under anchor clamps, realize with draw and press the fatigue test machine to be connected. In addition, the lower end of the upper connecting rod is provided with a through hole for the transverse cylinder shaft of the upper fastening device to pass through, and the upper end of the lower connecting rod is provided with a through hole for the transverse cylinder shaft of the lower fastening device to pass through. Through last connecting rod fastener and lower connecting rod fastener, realize connecting rod and lower connecting rod and supporting mechanism's being connected, further realize connecting and draw pressure fatigue testing machine and spline fatigue test anchor clamps to will draw pressure fatigue testing machine fatigue load transfer to spline fatigue test anchor clamps.
In order to realize the relative rotation between the connecting rod and the supporting mechanism and reduce the energy loss in the load transfer process, the connecting rod fastening device is preferably mainly composed of a cylinder shaft, a bearing, a sleeve, a bearing cover plate fastening screw, a gasket, a fastening bolt and a fastening nut. And the bearing outer ring is matched with the support mechanism sunken hole and is fastened through a bearing cover plate and a bearing cover plate fastening screw. The cylinder shaft penetrates through the through hole of the connecting rod, the cylinder shaft is connected with the inner ring of the bearing through the matching of the sleeve, the gasket, the fastening bolt and the fastening nut, the connecting rod is further connected with the supporting mechanism, and the preset aims of relative rotation between the connecting rod and the supporting mechanism and reduction of energy loss are achieved. The cylinder shaft, the sleeve and the fastening bolt respectively correspond to the upper cylinder shaft, the upper sleeve and the upper fastening bolt in the upper connecting rod fastening device, and respectively correspond to the lower cylinder shaft, the lower sleeve and the lower fastening bolt in the lower connecting rod fastening device.
The invention discloses a working method of a spline fatigue test device, which comprises the following steps:
and the external spline sample is fixedly connected with the internal clamping arm through the external spline clamping mechanism. The connection between the internal spline sample and the internal spline position fine-tuning mechanism is realized through the matching of the internal spline sample and the longitudinal groove of the left clamping block of the internal spline. The inner spline position coarse adjustment mechanism fastening bolt is driven by the inner spline position coarse adjustment mechanism to move vertically to drive the inner spline position coarse adjustment slide block to move vertically along the outer clamping arm guide rail groove, and the inner spline position coarse adjustment slide block is driven to drive the inner spline left clamping block and the inner spline right clamping block to move vertically to achieve coarse adjustment of the longitudinal relative position of the inner spline and the outer spline. After the left clamping block and the right clamping block of the internal spline move up and down to the preset position of coarse adjustment, the fastening bolt of the coarse adjustment mechanism of the position of the internal spline is matched and locked with the fastening nut of the coarse adjustment mechanism of the position of the internal spline.
The first self-locking sliding block is driven to move back and forth by adjusting the transverse movement of the first self-locking sliding block positioning bolt, the first self-locking sliding block is converted into the longitudinal up-and-down movement of the second self-locking sliding block by matching the partial inclined plane of the lower end surface of the first self-locking sliding block with the inclined plane of the upper end surface of the second self-locking sliding block, and the inner spline and the outer spline are adjusted by adjusting the fit clearance of the inner spline and the outer spline and the interaction pressure of the inner spline and the outer spline so as to ensure that the inner spline and the outer spline are tightly matched in the fatigue test process.
By adjusting the included angle between the outer clamping arm and the inner clamping arm, the axis of the inner and outer arm connecting cylinder shaft is not coplanar with the cylinder shaft of the fatigue testing machine connecting mechanism fastening device, and the purpose of converting the up-and-down cyclic load of the cylinder shaft of the fatigue testing machine connecting mechanism fastening device into the rotary cyclic load of the outer clamping arm and the inner clamping arm around the axis of the inner and outer arm connecting cylinder shaft is achieved.
The calculation formula of the rotating cyclic load is
The fatigue testing machine comprises an inner spline, an outer spline, a tension-compression fatigue testing machine, a fatigue testing machine connecting mechanism, an inner arm connecting cylinder, a tension-compression fatigue testing machine, a compression-compression fatigue testing machine, a compression machine.
Through going up connecting rod upper end and drawing and pressing fatigue testing machine anchor clamps cooperation, direct centre gripping is in drawing and pressing fatigue testing machine anchor clamps on, and lower connecting rod lower extreme and drawing and pressing fatigue testing machine anchor clamps cooperation down, direct centre gripping is in drawing and pressing fatigue testing machine anchor clamps down, realizes fixed connection and draws and presses fatigue testing machine and spline fatigue test anchor clamps to will draw and press fatigue testing machine fatigue load transmission to spline fatigue test anchor clamps.
And starting the tension-compression fatigue testing machine, applying tension-compression cyclic load until the spline fails to work due to fatigue, simultaneously recording load and displacement data borne by an upper clamp and a lower clamp of the testing machine, and converting according to a formula (2) to obtain tangential pressure between the internal spline and the external spline and the fatigue life of the spline under the load condition.
Has the advantages that:
1. according to the spline fatigue test device disclosed by the invention, on the basis of the tension and compression fatigue test machine, a special spline fatigue test machine is not needed, the requirement of the spline fatigue test machine is reduced by increasing a spline fatigue test fixture, the tension and compression cyclic load of the tension and compression fatigue test machine is converted into the rotation cyclic load between the internal spline and the external spline, the spline fatigue test is carried out on the tension and compression fatigue test machine, the cost and the complexity of the spline fatigue test can be reduced, and the spline fatigue test precision can be improved.
2. According to the spline fatigue test device disclosed by the invention, the spline fatigue clamp is arranged on the tension and compression fatigue test machine, the tension and compression cyclic load of the tension and compression fatigue test machine is converted into the rotation cyclic load between the internal spline and the external spline, so that the spline fatigue test is realized, and the spline fatigue test device has the characteristics of low test cost and high test precision.
3. According to the spline fatigue test device disclosed by the invention, the fit clearance between the internal spline and the external spline and the interaction force between the internal spline and the external spline are adjusted by adopting the sliding block self-locking device, the actual stress state of the spline can be simulated more accurately, and the spline fatigue test device has the characteristic of high test precision.
4. The spline fatigue test device disclosed by the invention realizes clamping and fatigue test of spline samples with different specifications by adopting the matching use of the internal spline position coarse adjustment mechanism and the internal spline position fine adjustment mechanism, and has the characteristic of universality.
Drawings
FIG. 1 is a schematic view of a spline fatigue testing apparatus disclosed in the present invention;
FIG. 2 is a schematic view of a spline fatigue test device according to the present invention;
FIG. 3 is a cross-sectional view of the external spline clamping mechanism disclosed in the present invention;
FIG. 4 is a schematic view of an external spline clamping mechanism disclosed in the present invention;
FIG. 5 is a cross-sectional view of the internal spline position fine adjustment mechanism disclosed in the present invention;
FIG. 6 is an internal schematic view of the internal spline position fine adjustment mechanism disclosed in the present invention;
FIG. 7 is a schematic view of a slider friction self-lock;
FIG. 8 is a partial cross-sectional view of the internal spline position gross adjustment mechanism disclosed in the present invention;
FIG. 9 is a schematic view of a coarse adjustment mechanism for the position of an internal spline according to the present disclosure;
FIG. 10 is an enlarged view of FIG. 9 at point D;
FIG. 11 is a schematic view of a rotational cyclic load calculation;
FIG. 12 is an enlarged view taken at point A in FIG. 1;
FIG. 13 is an enlarged view taken at point B of FIG. 1;
fig. 14 is an enlarged view of fig. 1 at point C.
Wherein: 1-external spline clamping mechanism, 2-internal spline position fine adjustment mechanism, 3-internal spline position coarse adjustment mechanism, 4-supporting mechanism and 5-fatigue testing machine connecting mechanism; 1.1-external spline fastening bolt, 1.2-external spline fastening nut, 2.1-internal spline left clamping block, 2.2-internal spline right clamping block, 2.3-first self-locking sliding block, 2.4-second self-locking sliding block, 2.5-sliding groove cover plate, 2.6-first self-locking sliding block positioning bolt, 2.7-sliding groove cover plate fastening bolt, 3.1-internal spline position coarse adjustment sliding block, 3.2-internal spline position coarse adjustment mechanism fastening bolt, 3.3-internal spline position coarse adjustment mechanism fastening nut, 4.1-external clamping arm, 4.2-internal clamping arm, 4.3-internal and external arm connecting cylinder shaft, 4.4-internal and external arm fastening bolt, 4.5-internal and external arm fastening nut, 4.6-internal and external arm connecting bearing, 4.7-internal and external arm connecting bearing gasket, 5.1-connecting rod, 5.2-cylinder shaft, 5.2.1-upper cylinder shaft, 5.2.2-lower cylinder cover plate, 5.5.5-internal and external cylinder shaft connecting bearing, 4.5.5.5.5-internal and external cylinder shaft connecting bearing, 4.5.5.5-internal cylinder sleeve, 4.5-internal cylinder sleeve, 4.2-internal cylinder shaft, 4.5.5-internal cylinder sleeve, 4.5-internal cylinder sleeve, 4.2-internal and internal cylinder sleeve, 4.2 internal cylinder shaft, 5.7-gasket, 5.8-fastening bolt, 5.8.1-upper fastening bolt, 5.8.2-lower fastening bolt, 5.9-fastening nut.
Detailed Description
The invention is further described with reference to the following figures, which are specific embodiments.
As shown in fig. 1, the spline fatigue testing apparatus disclosed in this embodiment includes a tension-compression fatigue testing machine and a spline fatigue testing jig.
As shown in fig. 1, the spline fatigue test fixture comprises an external spline clamping mechanism 1, an internal spline position fine adjustment mechanism 2, an internal spline position coarse adjustment mechanism 3, a supporting mechanism 4 and a fatigue tester connecting mechanism 5.
The external spline clamping mechanism is used for clamping an external spline and mainly comprises an external spline fastening bolt 1.1 and an external spline fastening nut 1.2, and is shown in figure 3. The outer spline is positioned between the two inner clamping arms 4.2, through holes matched with the upper ends of the inner clamping arms are formed in the center and the periphery of the outer spline, the center through hole of the outer spline is coaxial with the through hole of the inner clamping arm, and the diameters of the outer spline and the inner clamping arm are 22 mm. Four M6 bolt through holes matched with the inner clamping arm are distributed around the central hole of the outer spline, the M6 bolt through holes around the inner clamping arm and the outer spline are fixed with the inner clamping arm through four M6 outer spline fastening bolts 1.1 and M6 outer spline fastening nuts 1.2, and when the inner clamping arm rotates around a common shaft, the outer spline is driven to rotate around the common shaft simultaneously.
The inner spline position fine adjustment mechanism is used for fine adjustment of the fit clearance of the inner spline and the outer spline and the interaction pressure of the inner spline and the outer spline so as to ensure that the inner spline and the outer spline are tightly matched in the fatigue test process. As shown in fig. 5, the fine adjustment mechanism for the position of the internal spline mainly comprises a left clamping block 2.1 of the internal spline, a right clamping block 2.2 of the internal spline, a first self-locking sliding block 2.3, a second self-locking sliding block 2.4, a sliding groove cover plate 2.5, a first self-locking sliding block positioning bolt 2.6 and a sliding groove cover plate fastening bolt 2.7. The right side of the left clamping block 2.1 of the inner spline is provided with a cross-shaped groove, a transverse groove of the cross-shaped groove is used for placing a first self-locking sliding block 2.3, and the lower part of a longitudinal groove of the cross-shaped groove is sequentially provided with the inner spline and a second self-locking sliding block 2.4 from bottom to top. The lower end face of the first self-locking sliding block 2.3 is an inclined plane, and the upper end face of the second self-locking sliding block 2.4 is an inclined plane. And an M5 threaded through hole for a first self-locking sliding block positioning bolt 2.6 to pass through is machined in the center of the sliding groove cover plate 2.5. The transverse back-and-forth movement of the first self-locking sliding block positioning bolt 2.6 is adjusted through rotation to drive the first self-locking sliding block 2.3 to move back and forth, the partial inclined plane of the lower end surface of the first self-locking sliding block 2.3 is matched with the inclined plane of the upper end surface of the second self-locking sliding block 2.4, the back-and-forth movement of the first self-locking sliding block 2.3 is converted into the longitudinal up-and-down movement of the second self-locking sliding block 2.4, the longitudinal up-and-down movement of the second self-locking sliding block 2.4 is performed, the fit clearance between the internal spline and the external spline and the interaction pressure between the internal spline and the external spline are adjusted, and the internal spline and the external spline are tightly matched in the fatigue test process. The angle of the inclined plane matched with the lower end face of the first self-locking sliding block 2.3 and the upper end face of the second self-locking sliding block 2.4 is smaller than the friction angle, so that the self-locking of the inner spline position fine adjustment mechanism after moving to the preset position is ensured, and the self-locking is realized as shown in fig. 7. The friction angle is determined by the material static friction factor,
β＝arctan(f) (3)
where β is the friction angle and f is the static friction factor. In the present embodiment, the bevel angle β is 8.5 °.
The inner spline position coarse adjustment mechanism 3 is used for coarsely adjusting the longitudinal relative position of the inner spline and the outer spline. The inner spline position coarse adjustment mechanism 3 mainly comprises an outer clamping arm 4.1, an inner spline left clamping block 2.1, an inner spline right clamping block 2.2, an inner spline position coarse adjustment sliding block 3.1, an inner spline position coarse adjustment mechanism fastening bolt 3.2 and an inner spline position coarse adjustment mechanism fastening nut 3.3, as shown in fig. 8. The outer clamping arm 4.1 is shared by the inner spline position coarse adjustment mechanism 3 and the supporting mechanism 4. The left clamping block 2.1 and the right clamping block 2.2 of the internal spline are shared by the coarse adjustment mechanism 3 and the fine adjustment mechanism 2 of the position of the internal spline. And a guide rail groove for adjusting the left clamping block 2.1 of the internal spline and the right clamping block 2.2 of the internal spline to move up and down is processed on the outer clamping arm 4.1. The outer sides of the left clamping block 2.1 and the right clamping block 2.2 of the internal spline are fixedly connected with the coarse adjusting slide block 3.1 of the position of the internal spline respectively. The shape of the inner spline position coarse adjustment sliding block 3.1 is matched with the guide rail groove. The inner spline position coarse adjustment slide block 3.1 is driven to move up and down along the guide rail groove by the fastening bolt 3.2 of the inner spline position coarse adjustment mechanism which moves up and down longitudinally, the inner spline position coarse adjustment slide block 3.1 drives the left clamping block 2.1 of the inner spline and the right clamping block 2.2 of the inner spline to move up and down, and the longitudinal relative position coarse adjustment of the inner spline and the outer spline is realized. After the left clamping block 2.1 and the right clamping block 2.2 of the internal spline move up and down to the preset position of coarse adjustment, the fastening bolt 3.2 of the coarse adjustment mechanism of the position of the internal spline and the fastening nut 3.3 of the coarse adjustment mechanism of the position of the internal spline are matched and locked.
In order to realize the stepped adjustment of the relative positions of the left clamping block 2.1 and the right clamping block 2.2 of the inner spline and the outer clamping arm 4.1 and ensure the matching stability, the outer sides of the left clamping block 2.1 and the right clamping block 2.2 of the inner spline are processed with wavy textures matched with the outer clamping arm 4.1, the inner side of the outer clamping arm 4.1 is processed with textures matched with the left clamping block 2.1 and the right clamping block 2.2 of the inner spline, the stepped adjustment of the relative positions of the left clamping block 2.1 and the right clamping block 2.2 of the inner spline and the outer clamping arm is realized through the mutual matching among the textures, and more stable matching is provided for the left clamping block 2.1 of the inner spline, the right clamping block 2.2 of the inner spline and the outer clamping arm 4.1. The stepped adjustment accuracy is determined by the wave-like texture wavelength, and in the present embodiment, a trapezoidal wave-like texture having a wavelength of 2mm is used, as shown in fig. 10.
The supporting mechanism 4 mainly comprises an outer clamping arm 4.1, an inner clamping arm 4.2 and an inner arm and outer arm connecting device, so that the fixing of an inner spline sample and an outer spline sample is realized, and a tension-compression cyclic load in a tension-compression fatigue testing machine is converted into a rotation cyclic load between the inner spline and the outer spline, so that the stress state of the splines is closer to the actual working state. And through holes for the cylinder shaft of the fastening device of the connecting mechanism 5 of the fatigue testing machine to pass through are respectively processed at the lower end of the inner clamping arm 4.2 and the upper end of the outer clamping arm 4.1. And through holes for the inner and outer arm connecting cylinder shafts 4.3 of the inner and outer arm connecting device to pass through are respectively processed at the upper end of the inner clamping arm 4.2 and the lower end of the outer clamping arm 4.1. By adjusting the included angle between the outer clamping arm 4.1 and the inner clamping arm 4.2, the axial line of the inner and outer arm connecting cylinder shaft 4.3 is not coplanar with the cylinder shaft of the fatigue testing machine connecting mechanism 5 fastening device, and as shown in fig. 11, the up-and-down cyclic load of the cylinder shaft of the fatigue testing machine connecting mechanism 5 fastening device is converted into the rotary cyclic load of the outer clamping arm 4.1 and the inner clamping arm 4.2 around the axial line of the inner and outer arm connecting cylinder shaft 4.3. The calculation formula of the rotating cyclic load is
The fatigue testing machine comprises an inner spline, an outer spline, a tension-compression fatigue testing machine, a fatigue testing machine connecting mechanism, an inner arm connecting cylinder, a tension-compression fatigue testing machine, a compression-compression fatigue testing machine, a compression machine. In this embodiment, L is 200mm, R is 27.5mm, and θ is 45 °, so equation (4) can be simplified to
P＝5.14259F (5)
In order to achieve a relative rotation between the inner 4.2 and outer 4.1 gripping arms and to reduce energy losses during load transfer, the inner and outer arm connecting device mainly comprises an inner and outer arm connecting cylinder shaft 4.3, an inner and outer arm fastening bolt 4.4, an inner and outer arm fastening nut 4.5, an inner and outer arm connecting bearing 4.6 and an inner and outer arm connecting bearing gasket 4.7, as shown in fig. 12, a lower counter bore which is coaxial with the through hole at the upper end of the inner clamping arm 4.2 and is matched with the outer ring of the inner and outer arm connecting bearing 4.6 is processed at the upper end of the inner clamping arm 4.2, the inner and outer arm connecting cylinder shaft 4.3 passes through the through hole at the upper end of the inner clamping arm 4.2 and the lower end of the outer clamping arm 4.1, the connection of the inner clamping arm 4.2 and the outer clamping arm 4.1 is realized through an inner and outer arm fastening bolt 4.4, an inner and outer arm fastening nut 4.5, an inner and outer arm connecting bearing 4.6 and an inner and outer arm connecting bearing gasket 4.7, and achieves the preset aims of relative rotation between the inner 4.2 and outer 4.1 gripping arms and reduced energy consumption.
The fatigue testing machine connecting mechanism 5 is used for fixedly connecting the tension and compression fatigue testing machine and the spline fatigue testing clamp and transmitting the fatigue load of the tension and compression fatigue testing machine to the spline fatigue testing clamp. Comprises an upper connecting mechanism and a lower connecting mechanism. The upper connecting mechanism is used for connecting an upper clamp of a tension-compression fatigue testing machine and a spline fatigue testing clamp, and mainly comprises a connecting rod 5.1 and an upper connecting rod fastening device, as shown in figure 13. The lower connecting mechanism is used for connecting a lower clamp of a tension-compression fatigue testing machine and a spline fatigue testing clamp, and mainly comprises a connecting rod 5.1 and a lower connecting rod fastening mechanism, as shown in fig. 14. Connecting rod 5.1 one end with draw and press fatigue test machine anchor clamps cooperation, direct centre gripping in drawing and pressing fatigue test machine anchor clamps, realize being connected with drawing and pressing fatigue test machine, the connecting rod 5.1 other end processing has the through-hole that the horizontal section of thick bamboo axle that is used for fastener passed. Through connecting rod fastener, realize connecting rod 5.1 and the connection of supporting mechanism 4, further realize drawing and pressing fatigue testing machine and spline fatigue test anchor clamps to will draw and press fatigue testing machine fatigue load transmission to spline fatigue test anchor clamps.
In order to realize the relative rotation between the connecting rod 5.1 and the supporting mechanism 4 and reduce the energy loss in the load transmission process, the connecting rod fastening device mainly comprises a cylinder shaft 5.2, a bearing 5.3, a sleeve 5.4, a bearing cover plate 5.5, a bearing cover plate fastening screw 5.6, a gasket 5.7, a fastening bolt 5.8 and a fastening nut 5.9. And the outer ring of the bearing 5.3 is matched with the sunken hole of the support mechanism 4 and is fastened through a bearing cover plate 5.5 and a bearing cover plate fastening screw 5.6. The cylinder shaft 5.2 penetrates through a through hole of the connecting rod 5.1, the connection between the cylinder shaft 5.2 and an inner ring of the bearing 5.3 is realized through the matching of the sleeve 5.4, the gasket 5.7, the fastening bolt 5.8 and the fastening nut 5.9, the connection between the connecting rod 5.1 and the supporting mechanism 4 is further realized, and the preset aims of relative rotation between the connecting rod 5.1 and the supporting mechanism 4 and energy loss reduction are achieved. The cylinder shaft 5.2, the sleeve 5.4 and the fastening bolt 5.8 respectively correspond to the upper cylinder shaft 5.2.1, the upper sleeve 5.4.1 and the upper fastening bolt 5.8.1 in the upper connecting rod fastening device, and respectively correspond to the lower cylinder shaft 5.2.2, the lower sleeve 5.4.2 and the lower fastening bolt 5.8.2 in the lower connecting rod fastening device.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a spline fatigue test device which characterized in that: the test fixture comprises a tension-compression fatigue testing machine and a spline fatigue testing fixture;
the spline fatigue test fixture comprises an external spline clamping mechanism (1), an internal spline position fine adjustment mechanism (2), an internal spline position coarse adjustment mechanism (3), a supporting mechanism (4) and a fatigue tester connecting mechanism (5);
the external spline clamping mechanism is used for clamping an external spline and mainly comprises an external spline fastening bolt (1.1) and an external spline fastening nut (1.2); the outer spline is positioned between the two inner clamping arms (4.2), through holes matched with the upper ends of the inner clamping arms are formed in the center and the periphery of the outer spline, the center through hole of the outer spline is coaxial with the through hole of the inner clamping arm, an outer spline fastening bolt penetrates through the through holes in the periphery of the inner clamping arm and the outer spline and is fixed with the inner clamping arm, and when the inner clamping arm rotates around a common shaft, the outer spline is driven to rotate around the common shaft simultaneously;
the inner spline position fine adjustment mechanism (2) is used for fine adjusting the fit clearance between the inner spline and the outer spline and the interaction pressure between the inner spline and the outer spline so as to ensure that the inner spline and the outer spline are tightly matched in the fatigue test process; the inner spline position fine adjustment mechanism (2) mainly comprises an inner spline left clamping block (2.1), an inner spline right clamping block (2.2), a first self-locking sliding block (2.3), a second self-locking sliding block (2.4), a sliding groove cover plate (2.5), a first self-locking sliding block positioning bolt (2.6) and a sliding groove cover plate fastening bolt (2.7); a cross-shaped groove is formed in the right side of the left clamping block (2.1) of the inner spline, a transverse groove of the cross-shaped groove is used for placing a first self-locking sliding block (2.3), and the lower part of a longitudinal groove of the cross-shaped groove is sequentially provided with the inner spline and a second self-locking sliding block (2.4) from bottom to top; the lower end surface of the first self-locking sliding block (2.3) is an inclined surface, and the upper end surface of the second self-locking sliding block (2.4) is an inclined surface; a threaded through hole for a first self-locking sliding block positioning bolt (2.6) to pass through is machined in the center of the sliding groove cover plate (2.5); the first self-locking sliding block positioning bolt (2.6) is adjusted to transversely move back and forth by rotation to drive the first self-locking sliding block (2.3) to move back and forth, the part of the inclined plane of the lower end surface of the first self-locking sliding block (2.3) is matched with the inclined plane of the upper end surface of the second self-locking sliding block (2.4), the back and forth movement of the first self-locking sliding block (2.3) is converted into the longitudinal up and down movement of the second self-locking sliding block (2.4), the longitudinal up and down movement of the second self-locking sliding block (2.4) is realized, and the fit clearance between the internal spline and the external spline and the interaction pressure between the internal spline and the external spline are adjusted to ensure that the internal spline and the external spline are tightly matched in the fatigue test process; the bevel angle of the lower end face of the first self-locking sliding block (2.3) and the upper end face of the second self-locking sliding block (2.4) is smaller than the friction angle, so that the inner spline position fine adjustment mechanism is guaranteed to be self-locked after moving to a preset position;
the inner spline position coarse adjustment mechanism (3) is used for coarsely adjusting the longitudinal relative position of the inner spline and the outer spline; the inner spline position coarse adjustment mechanism (3) mainly comprises an outer clamping arm (4.1), an inner spline left clamping block (2.1), an inner spline right clamping block (2.2), an inner spline position coarse adjustment sliding block (3.1), an inner spline position coarse adjustment mechanism fastening bolt (3.2) and an inner spline position coarse adjustment mechanism fastening nut (3.3); the outer clamping arm (4.1) is shared by the inner spline position coarse adjustment mechanism (3) and the supporting mechanism (4); the inner spline left clamping block (2.1) and the inner spline right clamping block (2.2) are shared by the inner spline position coarse adjustment mechanism (3) and the inner spline position fine adjustment mechanism (2); a guide rail groove for adjusting the left clamping block (2.1) of the internal spline and the right clamping block (2.2) of the internal spline to move up and down is processed on the outer clamping arm (4.1); the outer sides of the left clamping block (2.1) and the right clamping block (2.2) of the internal spline are respectively fixedly connected with a coarse adjustment sliding block (3.1) of the position of the internal spline; the shape of the inner spline position coarse adjusting slide block (3.1) is matched with the guide rail groove; the internal spline position coarse adjustment mechanism fastening bolt (3.2) is driven to drive the internal spline position coarse adjustment slide block (3.1) to move up and down along the guide rail groove by longitudinally moving up and down, and the internal spline position coarse adjustment slide block (3.1) drives the internal spline left clamping block (2.1) and the internal spline right clamping block (2.2) to move up and down, so that the longitudinal relative position coarse adjustment of the internal spline and the external spline is realized; after the left clamping block (2.1) and the right clamping block (2.2) of the internal spline move up and down to the preset position for coarse adjustment, the fastening bolt (3.2) of the coarse adjustment mechanism of the position of the internal spline is matched and locked with the fastening nut (3.3) of the coarse adjustment mechanism of the position of the internal spline;
the supporting mechanism (4) mainly comprises an outer clamping arm (4.1), an inner clamping arm (4.2) and an inner and outer arm connecting device, so that the fixing of an inner spline sample and an outer spline sample is realized, and a tension-compression cyclic load in a tension-compression fatigue testing machine is converted into a rotation cyclic load between the inner spline and the outer spline, so that the stress state of the spline is closer to the actual working state; through holes for a fastening device cylinder shaft of the fatigue testing machine connecting mechanism (5) to pass through are respectively processed at the lower end of the inner clamping arm (4.2) and the upper end of the outer clamping arm (4.1); through holes for the inner and outer arm connecting cylinder shafts (4.3) of the inner and outer arm connecting device to pass through are respectively processed at the upper end of the inner clamping arm (4.2) and the lower end of the outer clamping arm (4.1); the up-and-down cyclic load of the fastening device cylinder shaft of the fatigue testing machine connecting mechanism (5) is converted into the rotary cyclic load of the outer clamping arm (4.1) and the inner clamping arm (4.2) around the axis of the inner-and-outer arm connecting cylinder shaft (4.3) by adjusting the included angle between the outer clamping arm (4.1) and the inner clamping arm (4.2) to ensure that the axis of the inner-and-outer arm connecting cylinder shaft (4.3) is not coplanar with the fastening device cylinder shaft of the fatigue testing machine connecting mechanism (5);
the fatigue testing machine connecting mechanism (5) is used for fixedly connecting the tension and compression fatigue testing machine and the spline fatigue testing clamp and transmitting the fatigue load of the tension and compression fatigue testing machine to the spline fatigue testing clamp; the fatigue testing machine connecting mechanism (5) comprises an upper connecting mechanism (5.1) and a lower connecting mechanism (5.2); the upper connecting mechanism (5.1) is used for connecting an upper clamp of a tension and compression fatigue testing machine and a spline fatigue testing clamp, mainly comprises an upper connecting rod (5.1.1) and an upper connecting rod fastening device, the upper end of the upper connecting rod (5.1.1) is matched with the upper clamp of the tension and compression fatigue testing machine, and is directly clamped on the upper clamp of the tension and compression fatigue testing machine to realize connection with the tension and compression fatigue testing machine; the lower connecting mechanism (5.2) is used for connecting a lower clamp of a tension and compression fatigue testing machine and a spline fatigue testing clamp, mainly comprises a lower connecting rod (5.2.1) and a lower connecting rod fastening mechanism, the lower end of the lower connecting rod (5.2.1) is matched with the lower clamp of the tension and compression fatigue testing machine, and is directly clamped on the lower clamp of the tension and compression fatigue testing machine to realize connection with the tension and compression fatigue testing machine; in addition, a through hole for the transverse cylinder shaft of the upper fastening device to pass through is processed at the lower end of the upper connecting rod (5.1.1), and a through hole for the transverse cylinder shaft of the lower fastening device to pass through is processed at the upper end of the lower connecting rod (5.2.1); through last connecting rod fastener and lower connecting rod fastener, realize connecting rod (5.1.1) and connecting rod (5.2.1) and the being connected of supporting mechanism (4) down, further realize connecting and draw pressure fatigue testing machine and spline fatigue test anchor clamps to will draw pressure fatigue testing machine fatigue load transfer to spline fatigue test anchor clamps.
2. A spline fatigue test device according to claim 1, characterized in that: the friction angle is determined by the material static friction factor,
β＝arctan(f) (1)
where β is the friction angle and f is the static friction factor.
3. A spline fatigue test device according to claim 1, characterized in that: in order to realize the stepped adjustment and the matching stability of the relative positions of the left clamping block (2.1) of the inner spline, the right clamping block (2.2) of the inner spline and the outer clamping arm (4.1), the outer sides of the left clamping block (2.1) of the inner spline and the right clamping block (2.2) of the inner spline are processed with wavy textures matched with the outer clamping arm (4.1), the inner sides of the outer clamping arm (4.1) are processed with wavy textures matched with the left clamping block (2.1) of the inner spline and the right clamping block (2.2) of the inner spline, the relative positions of the left clamping block (2.1) of the inner spline and the right clamping block (2.2) of the outer clamping arm are adjusted in a stepped manner through mutual matching among the textures, and more stable matching is provided for the left clamping block (2.1) of the inner spline, the right clamping block (2.2) of the inner spline and the outer clamping arm (4.1).
4. A spline fatigue test device according to claim 1, characterized in that: in order to realize the relative rotation between the inner clamping arm (4.2) and the outer clamping arm (4.1) and reduce the energy loss in the load transfer process, the inner and outer arm connecting device mainly comprises an inner and outer arm connecting cylinder shaft (4.3), an inner and outer arm fastening bolt (4.4), an inner and outer arm fastening nut (4.5), an inner and outer arm connecting bearing (4.6) and an inner and outer arm connecting bearing gasket (4.7), a lower counter bore which is coaxial with a through hole at the upper end of the inner clamping arm (4.2) and matched with the outer ring of the inner and outer arm connecting bearing (4.6) is processed at the upper end of the inner clamping arm (4.2), the inner and outer arm connecting cylinder shaft (4.3) passes through the through hole at the upper end of the inner clamping arm (4.2) and the lower end of the outer clamping arm (4.1), and the inner and outer arm connecting bearing (4.2) is connected with the outer clamping arm (4.1) through the inner and outer arm fastening bolt (4.4.4.4.4), the inner and outer arm connecting bearing gasket (4.7), and achieves the preset aims of relative rotation between the inner clamping arm (4.2) and the outer clamping arm (4.1) and reduction of energy loss.
5. A spline fatigue test device according to claim 1, characterized in that: in order to realize the relative rotation between the connecting rod (5.1) and the supporting mechanism (4) and reduce the energy loss in the load transmission process, the connecting rod fastening device mainly comprises a cylinder shaft (5.2), a bearing (5.3), a sleeve (5.4), a bearing cover plate (5.5), a bearing cover plate fastening screw (5.6), a gasket (5.7), a fastening bolt (5.8) and a fastening nut (5.9); the outer ring of the bearing (5.3) is matched with a sunken hole of the support mechanism (4) and is fastened through a bearing cover plate (5.5) and a bearing cover plate fastening screw (5.6); the cylinder shaft (5.2) penetrates through the through hole of the connecting rod (5.1), the connection between the cylinder shaft (5.2) and the inner ring of the bearing (5.3) is realized through the matching of the sleeve (5.4), the gasket (5.7), the fastening bolt (5.8) and the fastening nut (5.9), the connection between the connecting rod (5.1) and the supporting mechanism (4) is further realized, and the preset aims of relative rotation between the connecting rod (5.1) and the supporting mechanism (4) and reduction of energy loss are achieved; the cylinder shaft (5.2), the sleeve (5.4) and the fastening bolt (5.8) respectively correspond to the upper cylinder shaft (5.2.1), the upper sleeve (5.4.1) and the upper fastening bolt (5.8.1) in the upper connecting rod fastening device, and respectively correspond to the lower cylinder shaft (5.2.2), the lower sleeve (5.4.2) and the lower fastening bolt (5.8.2) in the lower connecting rod fastening device.
6. A spline fatigue testing device according to claim 1, 2, 3, 4 or 5, wherein: the working method is that,
the external spline sample is fixedly connected with an internal clamping arm (4.2) through an external spline clamping mechanism (1); the connection between the internal spline sample and the internal spline position fine-tuning mechanism (2) is realized through the matching of the internal spline sample and the longitudinal groove of the internal spline left clamping block (2.1); the inner spline position coarse adjustment sliding block (3.1) is driven by a fastening bolt (3.2) of the inner spline position coarse adjustment mechanism to move up and down longitudinally along a guide rail groove of an outer clamping arm (4.1), and the inner spline position coarse adjustment sliding block (3.1) drives a left clamping block (2.1) and a right clamping block (2.2) of the inner spline to move up and down, so that the longitudinal relative position coarse adjustment of the inner spline and the outer spline is realized; after the left clamping block (2.1) and the right clamping block (2.2) of the internal spline move up and down to the preset position for coarse adjustment, the fastening bolt (3.2) of the coarse adjustment mechanism of the position of the internal spline is matched and locked with the fastening nut (3.3) of the coarse adjustment mechanism of the position of the internal spline;
the first self-locking sliding block (2.3) is driven to move back and forth by adjusting a first self-locking sliding block positioning bolt (2.6) to move back and forth transversely, the back and forth movement of the first self-locking sliding block (2.3) is converted into the longitudinal up and down movement of the second self-locking sliding block (2.4) by matching a part of inclined plane of the lower end surface of the first self-locking sliding block (2.3) with an inclined plane of the upper end surface of the second self-locking sliding block (2.4), the longitudinal up and down movement of the second self-locking sliding block (2.4) is adjusted, and the fit clearance between the internal spline and the external spline and the interaction pressure between the internal spline and the external spline are adjusted so as to ensure that the internal spline and the external spline are tightly matched in the fatigue test process;
the up-and-down cyclic load of the fastening device cylinder shaft of the fatigue testing machine connecting mechanism (5) is converted into the rotary cyclic load of the outer clamping arm (4.1) and the inner clamping arm (4.2) around the axis of the inner-and-outer arm connecting cylinder shaft (4.3) by adjusting the included angle between the outer clamping arm (4.1) and the inner clamping arm (4.2) to ensure that the axis of the inner-and-outer arm connecting cylinder shaft (4.3) is not coplanar with the fastening device cylinder shaft of the fatigue testing machine connecting mechanism (5);
the upper end of an upper connecting rod (5.1.1) is matched with an upper clamp of a tension-compression fatigue testing machine and is directly clamped on the upper clamp of the tension-compression fatigue testing machine, the lower end of a lower connecting rod (5.2.1) is matched with a lower clamp of the tension-compression fatigue testing machine and is directly clamped on the lower clamp of the tension-compression fatigue testing machine, the tension-compression fatigue testing machine and a spline fatigue testing clamp are fixedly connected, and the fatigue load of the tension-compression fatigue testing machine is transferred to the spline fatigue testing clamp;
and starting the tension-compression fatigue testing machine, applying tension-compression cyclic load until the spline fails in fatigue, simultaneously recording load and displacement data borne by an upper clamp and a lower clamp of the testing machine, and converting according to a formula (2) to obtain tangential pressure between the internal spline and the external spline and the fatigue life of the spline under the load condition, namely realizing the spline fatigue test.
7. The spline fatigue test device of claim 6, wherein: the calculation formula of the rotating cyclic load is
The fatigue testing machine comprises an inner spline, an outer spline, a tension-compression fatigue testing machine, a fatigue testing machine connecting mechanism, an inner arm connecting cylinder, a tension-compression fatigue testing machine, a compression-compression fatigue testing machine, a compression machine.
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