WO2023032631A1 - トリポード型等速自在継手 - Google Patents
トリポード型等速自在継手 Download PDFInfo
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- WO2023032631A1 WO2023032631A1 PCT/JP2022/030621 JP2022030621W WO2023032631A1 WO 2023032631 A1 WO2023032631 A1 WO 2023032631A1 JP 2022030621 W JP2022030621 W JP 2022030621W WO 2023032631 A1 WO2023032631 A1 WO 2023032631A1
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- WIPO (PCT)
- Prior art keywords
- tripod
- leg shaft
- region
- constant velocity
- joint
- Prior art date
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- 230000002093 peripheral effect Effects 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 description 21
- 238000010791 quenching Methods 0.000 description 15
- 230000000171 quenching effect Effects 0.000 description 15
- 238000005255 carburizing Methods 0.000 description 11
- 238000005496 tempering Methods 0.000 description 9
- 238000005242 forging Methods 0.000 description 7
- 229910000760 Hardened steel Inorganic materials 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 6
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000010273 cold forging Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 102200082907 rs33918131 Human genes 0.000 description 1
- 102220005308 rs33960931 Human genes 0.000 description 1
- 102220259718 rs34120878 Human genes 0.000 description 1
- 102220062469 rs786203185 Human genes 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
- F16D3/202—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints
- F16D3/205—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
Definitions
- the present invention relates to tripod-type constant velocity universal joints used for power transmission in automobiles and various industrial machines.
- a sliding constant velocity universal joint is connected to the inboard side (center side in the vehicle width direction) of the intermediate shaft, and the outboard side (end in the vehicle width direction) side) is often connected to a fixed constant velocity universal joint.
- the sliding constant velocity universal joint referred to here permits both angular displacement and axial relative movement between two axes
- the fixed constant velocity universal joint permits angular displacement between two axes. However, it does not allow relative axial movement between the two axes.
- a tripod type constant velocity universal joint is known as a sliding constant velocity universal joint.
- a roller inserted into the track groove of the outer joint member is rotatably attached to the leg shaft of the tripod member via a plurality of needle rollers.
- the double roller type includes a roller inserted into the track groove of the outer joint member, and an inner ring that fits over the leg shaft of the tripod member and supports the roller rotatably. Since the double roller type allows the rollers to oscillate about the leg shaft, the induced thrust (axial force induced by friction between parts inside the joint) and sliding resistance are reduced compared to the single roller type. It has the advantage of being able to reduce each.
- Patent Document 1 discloses an example of a double roller type tripod type constant velocity universal joint.
- the outer peripheral surface of the leg shaft of the tripod member and the inner peripheral surface of the inner ring are in point contact or nearly point contact on the torque load side. Therefore, in this type of tripod type constant velocity universal joint, the surface pressure at the contact portion between the outer peripheral surface of each shaft and the inner peripheral surface of the inner ring increases, especially at high load torque. Therefore, the durability of the contact portion on the outer peripheral surface of the leg shaft may be affected.
- Patent Document 1 discloses that a hardened layer is formed on the leg axle by carburizing, quenching and tempering, and the tripod member is made of steel with a carbon content of 0.23 to 0.44%.
- a double roller type tripod type constant velocity universal joint having an effective hardened layer with a limit hardness of 600Hv is disclosed.
- the double roller type tripod type constant velocity universal joint described in Patent Document 1 is obtained, for example, by carburizing and quenching chromium-molybdenum steel with a carbon content of 0.34% and then subjecting it to high-temperature tempering. With this configuration, the amount of carbon in the steel material can be increased more than before. It is possible to improve the durability of the leg shaft in the part.
- an object of the present invention is to improve the strength of the root portion of the leg shaft of the tripod member.
- the present invention which has been made based on the above findings, has track grooves extending in the axial direction of the joint at three locations in the circumferential direction, and each track groove has a pair of roller guide surfaces arranged opposite to each other in the circumferential direction of the joint.
- a trunk portion having a center hole; three leg shafts protruding radially from the trunk portion; a tripod member made of steel and having a curvilinear intermediate portion; a roller mounted on each of the leg shafts; and an inner ring fitted on the leg shaft and rotatably supporting the rollers.
- roller is movable along the roller guide surface in the axial direction of the outer joint member, and the roller and the inner ring constitute a roller unit that can swing with respect to the leg shaft;
- the middle of the tripod member a first region having a radius of curvature Ra in a cross section including the axis of the leg shaft and perpendicular to the joint axial direction; A second region is provided, and Ra>Rb.
- connection area S between the first area and the second area which is smoothly connected to both areas.
- Ra/PCD is the pitch circle diameter of the roller guide surface of the outer joint member.
- t/PCD 0.145, where t is the minimum distance from the large-diameter portion of the spline formed on the inner peripheral surface of the body of the tripod member to the first region.
- the surface hardness of the leg shaft of the tripod member is preferably 653HV or more.
- the internal hardness of the tripod member is preferably 513HV or more. By setting the internal hardness to 513 HV or more, the effective hardened layer depth required for the tripod member can be obtained.
- FIG. 2 is a cross-sectional view in the joint axial direction showing a double roller type tripod constant velocity universal joint.
- FIG. 2 is a cross-sectional view taken along line KK of FIG. 1;
- FIG. 2 is a cross-sectional view taken along line LL of FIG. 1;
- FIG. 2 is a cross-sectional view showing a state in which the tripod-type constant velocity universal joint of FIG. 1 has an operating angle;
- FIG. 4 is a cross-sectional view showing a hardened layer formed on a tripod member;
- FIG. 10 is a diagram showing a hardness distribution in a conventional leg shaft;
- FIG. 10 is a diagram showing the hardness distribution on the leg shaft of the improved product; It is the front view which looked at the tripod member from the joint axial direction.
- FIG. 9 is a cross-sectional view taken along line MM of FIG. 8; 4 is a cross-sectional view showing an enlarged first region; FIG. It is sectional drawing which expands and shows a 2nd area
- FIG. 3 is a cross-sectional view showing an enlarged vicinity of a first region of a tripod member in FIG. 2;
- FIG. 1 An embodiment of a tripod-type constant velocity universal joint according to the present invention will be described with reference to FIGS. 1 to 12.
- FIG. 1 An embodiment of a tripod-type constant velocity universal joint according to the present invention will be described with reference to FIGS. 1 to 12.
- FIG. 1 An embodiment of a tripod-type constant velocity universal joint according to the present invention will be described with reference to FIGS. 1 to 12.
- FIG. 1 An embodiment of a tripod-type constant velocity universal joint according to the present invention will be described with reference to FIGS. 1 to 12.
- the tripod type constant velocity universal joint 1 of this embodiment shown in FIGS. 1 to 4 is of double roller type.
- 1 is an axial cross-sectional view of a double roller type tripod type constant velocity universal joint
- FIG. 2 is a cross-sectional view taken along line KK of FIG. 3 is a cross-sectional view taken along line LL in FIG. 1
- FIG. 4 is an axial cross-sectional view showing the tripod type constant velocity universal joint when the operating angle is taken.
- the axial direction of the joint and the circumferential direction of the joint respectively mean the axial direction and the circumferential direction of the tripod type constant velocity universal joint when the operating angle is set to 0°.
- this tripod type constant velocity universal joint 1 is mainly composed of an outer joint member 2, a tripod member 3 as an inner joint member, and a roller unit 4 as a torque transmission member.
- the outer joint member 2 has a cup shape with one end opened, and three linear track grooves 5 extending in the joint axial direction are formed on the inner peripheral surface at regular intervals in the joint circumferential direction.
- a roller guide surface 6 is formed in each track groove 5 so as to face each other in the joint circumferential direction of the outer joint member 2 and extend in the joint axial direction.
- a tripod member 3 and a roller unit 4 are housed inside the outer joint member 2 .
- the tripod member 3 includes a body portion 31 (trunnion body portion) having a central hole 30 and three leg shafts 32 (trunnion shafts) protruding radially from trisecting positions in the joint circumferential direction of the outer peripheral surface of the body portion 31 (trunnion body portion). journal) and an intermediate portion 33 that connects the outer peripheral surface of the trunk portion 31 and the outer peripheral surface of the leg shaft 32 together.
- the tripod member 3 is coupled to the shaft 8 so as to transmit torque by fitting a male spline 81 formed on the shaft 8 as an axis into a female spline 34 formed in the central hole 30 of the trunnion body 31 . be.
- the end surface of the tripod member 3 on one side in the joint axial direction is engaged with the shoulder portion 82 provided on the shaft 8, and the retaining ring 10 attached to the tip of the shaft 8 is engaged with the end surface of the tripod member 3 on the other side in the joint axial direction. By doing so, the tripod member 3 is fixed to the shaft 8 in the joint axial direction.
- the roller unit 4 includes an outer ring 11, which is an annular roller centered on the axis of the leg shaft 32, and an annular inner ring 12, which is arranged on the inner diameter side of the outer ring 11 and fitted onto the leg shaft 32. , and a large number of needle rollers 13 interposed between the outer ring 11 and the inner ring 12 .
- the roller unit 4 is housed in the track groove 5 of the outer joint member 2 .
- the roller unit 4 consisting of the outer ring 11, the inner ring 12, and the needle rollers 13 is structured so as not to be separated by the washers 14 and 15. As shown in FIG.
- the outer peripheral surface 11a (see FIG. 2) of the outer ring 11 is a convex curved surface whose generatrix is an arc having the center of curvature on the axis of the leg shaft 32.
- An outer peripheral surface 11 a of the outer ring 11 is in angular contact with the roller guide surface 6 .
- the needle rollers 13 are free to roll between the outer raceway surface of the outer ring 11 and the inner raceway surface of the inner ring 12, respectively. placed in
- each leg shaft 32 of the tripod member 3 has a straight shape in the axial direction of the leg shaft 32 in a cross section in any direction including the axis of the leg shaft 32 . Further, as shown in FIG. 3 , the outer peripheral surface of the leg shaft 32 has a substantially elliptical shape in a cross section perpendicular to the axis of the leg shaft 32 .
- the outer peripheral surface of the leg shaft 32 contacts the inner peripheral surface 12a of the inner ring 12 in a direction orthogonal to the joint axial direction, that is, in the direction of the long axis a.
- a gap m is formed between the outer peripheral surface of the leg shaft 32 and the inner peripheral surface 12a of the inner ring 12 in the direction of the joint axis, that is, the direction of the minor axis b.
- the intermediate portion 33 between the trunk portion 31 of the tripod member 3 and the leg shaft 32 is formed to draw a concave curve in any cross section including the axis of the leg shaft 32.
- the inner peripheral surface 12a of the inner ring 12 has a convex arc shape in any cross section including the axis of the inner ring 12.
- the cross-sectional shape of the leg shaft 32 is substantially elliptical as described above, and the predetermined gap m is provided between the leg shaft 32 and the inner ring 12. 32 can be swung.
- the inner ring 12 and the outer ring 11 are assembled to be relatively rotatable via the needle rollers 13, so that the outer ring 11 can swing integrally with the inner ring 12 with respect to the leg shaft 32. is. That is, the axes of the outer ring 11 and the inner ring 12 can be tilted with respect to the axis of the leg shaft 32 within a plane including the axis of the leg shaft 32 (see FIG. 4).
- the cross section (transverse section) of the leg shaft 32 is substantially elliptical, and the cross section (longitudinal section) of the inner peripheral surface 12a of the inner ring 12 is an arcuate convex section.
- the outer peripheral surface of the leg shaft 32 and the inner peripheral surface 12a of the inner ring 12 are in point contact or close to point contact in a narrow area. Therefore, the force that tends to incline the roller unit 4 is reduced, and the stability of the posture of the outer ring 11 is improved.
- the tripod member 3 described above is made from a steel material through the main processes of forging (cold forging) ⁇ machining (turning) ⁇ broaching of the spline 34 ⁇ heat treatment ⁇ grinding the outer peripheral surface of the leg shaft 32 . produced through.
- the outer peripheral surface of the leg shaft 32 can be finished by hardened steel cutting instead of the grinding process.
- a spheroidizing annealing step and a bonder treatment step can be added before cold forging.
- the spheroidizing annealing step can be omitted if there is no problem with the forgeability during cold forging due to circumstances such as the use of a material with a low carbon content.
- As the heat treatment, carburizing, quenching and tempering are performed.
- FIG. 5 is a cross-sectional view showing the hardened layer 16 formed by heat-treating the tripod member 3.
- the hardened layer 16 is formed by hardening the carburized layer by quenching.
- a hardened layer 16 is formed on the entire surface of the tripod member 3 including the outer peripheral surface of the leg shaft 32 , the outer peripheral surface of the body portion 31 , the surface of the intermediate portion 33 and the surfaces of the female splines 34 .
- the outer peripheral surface of the leg shaft 32 is finished by grinding (or by cutting hardened steel). It is shallow as much as the machining allowance due to etc. Since this machining allowance is usually as small as about 0.1 mm, the thickness of the hardening layer 16 is drawn uniformly over the entire surface in FIG.
- the tripod member 3 is forged from chromium-molybdenum steel, which is a type of case-hardened steel, and then subjected to carburizing, quenching, and tempering as heat treatment to form a hardened layer 16 on the surface.
- a conventional tripod member 3 material e.g., JIS G4052 chromium-molybdenum steel, etc., equivalent to a carbon content of less than about 0.23%
- carburized and quenched quenching temperature 860 ° C. , and a tempering temperature of 180° C.
- the hardness of the surface exceeds 513 HV, but the hardness is lower than 513 HV in a very shallow region from the surface. Therefore, when excessive torque is applied, the durability of the contact portion of the leg shaft 32 is affected. Therefore, in order to solve the above problem, it is necessary to form the hardening layer 16 as deeply as possible.
- the effective hardening layer depth means the distance from the surface of the steel material to the position of the limit hardness.
- the limit hardness of the effective hardened layer is 550HV.
- Critical hardness may be used."
- the internal hardness of the tripod member 3 (the hardness of the region that is not quenched) is 513 HV or more. is defined as 600HV.
- the easiest way to deepen the hardened layer 16 is to increase the depth of the carburized layer, but forming a deep carburized layer requires an enormous amount of carburizing time, resulting in an increase in manufacturing costs. It is conceivable to use a steel material with a high carbon content, such as carbon steel for machine structural use such as S50C to S55C, as the material, and change the heat treatment method to induction quenching, which allows deeper quenching than carburizing quenching, but in this case. Since the material becomes harder as the amount of carbon increases, the processing load increases when forging the tripod member 3, which causes problems such as an increase in the size of the forging equipment.
- FIG. 7 shows the hardness distribution when carburizing, quenching, and tempering are performed using a chromium-molybdenum steel with a carbon content of about 0.34% as the material.
- the quenching temperature is 850°C and the tempering temperature is 180°C.
- the horizontal axis (depth from the surface) in FIG. 7 is shown on the same scale as in FIG.
- the depth of the hardened layer 16 can be increased as intended by increasing the carbon content of the case hardening steel. As a result of increasing the depth of the hardened layer 16 in this way, it can also be understood that the internal hardness becomes 513 HV or more.
- the toughness of the leg shaft 32 may decrease and the repeated fatigue strength of the tripod member 3 may decrease. A countermeasure for this problem will be described later.
- the type of material that can be used is not limited.
- SCM440 or the like can be used in addition to SCM435.
- H steel for example, SCM435H, SCM440H, etc.: defined in JIS G4052
- chromium steel for example, SCr435, SCr440, etc.
- JIS G4053 chromium steel (for example, SCr435, SCr440, etc.) specified in JIS G4053 can also be used as the material.
- H steel such as SCr435H and SCr440H can be used.
- case-hardening steel such as chromium-molybdenum steel and chromium steel
- carbon steel for machine structural use such as S10C to S35C can be used as the material.
- a steel material with a carbon content of 0.44% or less it is preferable to use.
- a steel material containing more than 0.44% carbon can also be used. If the case-hardened steel has a carbon content of 1% or less, no particular problem occurs during hot forging.
- the improved product described above had a problem with the strength of the root portion (intermediate portion 33) of the leg shaft 32.
- the reason for this is that the entire tripod member 3 is hardened from the surface to the deep region, and the toughness of the tripod member 3 is reduced. It is presumed that the fatigue strength of the tripod member 3 is lowered, which affects the strength of the intermediate portion 33 . Attempting to solve this problem by reconsidering the materials and heat treatment technique may reduce the durability of the contact portion X of the leg shaft 32, and it is desired to solve the problem from a different point of view.
- the tripod member 3 was reconsidered from the aspect of shape.
- the intermediate portion 33 is formed over the entire circumference of the leg shaft 32 so that the cross section including the axis of the leg shaft 32 forms a concave curve.
- the intermediate portion 33 has a curvature radius of It is formed in an arc shape of Ra, and is formed in an arc shape with a curvature radius Rb in a cross section including the axis of the leg shaft 32 in the joint axial direction (minor axis direction of the ellipse formed by the cross section of the leg shaft 32).
- the curvature radius Ra is larger than the curvature radius Rb (Ra>Rb).
- a first region P having a radius of curvature Ra and a second region Q having a radius of curvature Rb are each formed to have a width in the circumferential direction of the leg shaft 32.
- the first region P can be formed in a partial region in the circumferential direction of the leg shaft 32 centered on a plane that includes the axis of the leg shaft 32 and is orthogonal to the joint axial direction.
- the second region Q can be formed in a partial region in the circumferential direction of the leg shaft 32 centered on a plane in the joint axial direction including the axis of the leg shaft 32 .
- two first regions P are arranged to face each other in a direction orthogonal to the joint axial direction
- two second regions Q are arranged to face each other in the joint axial direction.
- the portion sandwiched between the adjacent first region P and second region Q has a first region P and a second region Q.
- a connection region S smoothly connected to each of Q is formed.
- the curvature radius is gradually changed in the circumferential direction of the leg shaft 32 .
- the intermediate portion 33 is formed by any one of the first region P, the second region Q, and the connection region S.
- Each of these regions P, Q, and S can be formed by a single circular arc or multiple circular arcs with different radii of curvature in a longitudinal section including the axis of the leg shaft 32 .
- the minimum radius of curvature in a cross section including the axis of the leg shaft 32 is Ra
- the maximum radius of curvature in the cross section including the axis of the leg shaft 32 is Rb.
- the shape of the intermediate portion 33 is determined such that Ra>Rb. Any one or two of the regions P, Q, and S may be formed by a single arc, and the remaining regions may be formed by multiple arcs.
- the second region Q is a portion with a low degree of contribution to torque transmission. Therefore, by reducing the radius of curvature Rb of the second region Q, more material is removed during processing, and weight reduction can be achieved while avoiding a reduction in the strength of the tripod member 3 . This effect, as shown in FIG. By making it larger than ⁇ , it can be obtained more remarkably.
- the needle rollers 13 do not roll on the outer peripheral surface of the leg shaft 32 . It is not necessary to provide a thinned portion (recessed portion) for avoiding interference with the shaped roller 13. - ⁇ Therefore, no edges are formed in the region from the surface of the intermediate portion 33 to the outer peripheral surface of the leg shaft 32, and the region from the intermediate portion 33 to the outer peripheral surface of the leg shaft 32 continues smoothly. becomes. Therefore, by providing a difference between the curvature radii Ra and Rb, it is possible to sufficiently obtain the effect of alleviating stress concentration.
- the curvature radius Ra in the first region P of the intermediate portion 33 is preferably Ra/PCD ⁇ 0.0850, where PCD is the pitch circle diameter of the roller guide surface 6 of the outer joint member 2 (see FIG. 2). Further, t (see FIG. 5) is the minimum distance from the large-diameter portion 34a of the spline 34 formed on the inner peripheral surface of the body portion 31 of the tripod member 3 to the first region P, and t/PCD ⁇ 0.145. preferably set. Note that PCD, Ra, and t all have the same unit (mm).
- FIG. 12 is an enlarged cross-sectional view showing the vicinity of the intermediate portion 33 (first region P) of the tripod member 3.
- the inner diameter side of the first region P is smoothly connected to the outer peripheral surface of the body portion 31 by drawing a tangent line.
- the outer diameter side of the first region P is connected to the outer peripheral surface of the leg shaft 32 via a minute step Z.
- This step Z is due to the fact that when the outer peripheral surface of the leg shaft 32 is ground after the tripod member 3 is cold forged, the outer peripheral surface of the leg shaft 32 retreats by the grinding margin.
- the conventional product is set to R/PCD ⁇ 0.0850.
- the term "conventional product" used herein means that the intermediate portion 33 has a uniform radius of curvature R over its entire circumference.
- the thickness of the first region P that is, the minimum distance t (see FIG. 12: wall thickness) can be increased. Specifically, t/PCD ⁇ 0.145 can be satisfied.
- the first region P of the intermediate portion 33 of the leg shaft 32 is strength, especially fatigue strength, can be increased. Therefore, it is possible to increase the torsional strength of the leg shaft 32 and improve the degree of freedom in designing the tripod member 3 .
- the grinding allowance Y increases on the outer diameter side of the first region P. It was confirmed that the grinding accuracy when grinding the outer peripheral surface of the pedestal 32 is not adversely affected within the range of 0.20. Therefore, the upper limit of Ra/PCD is preferably 0.20. That is, it is preferable to set 0.0850 ⁇ Ra/PCD ⁇ 0.20. Also, if the value of t/PCD is too large, the tripod member 3 will be unnecessarily large and will increase in weight. .20).
- the radius of curvature Rb of the second region Q is preferably in the range of 0.0550 ⁇ Rb/PCD ⁇ 0.0820.
- Rb/PCD 0.0550 ⁇ Rb/PCD.
- the outer peripheral surface of the leg shaft 32 may be formed into a convex curved surface (for example, a convex circular cross section), and the inner peripheral surface 12a of the inner ring 12 may be formed into a cylindrical surface.
- the outer peripheral surface of the leg shaft 32 may be formed into a convex curved surface (for example, a convex arcuate cross section), and the inner peripheral surface 12a of the inner ring 12 may be formed into a concave spherical surface that fits with the outer peripheral surface of the leg shaft.
- the washers 14 and 15 can be eliminated by providing flanges at both inner diameter end portions of the outer ring.
- the tripod type constant velocity universal joint 1 described above is not limited to application to drive shafts of automobiles, but can be widely used in power transmission paths of automobiles, industrial equipment, and the like.
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Abstract
Description
2 外側継手部材
3 トリポード部材
4 ローラユニット
5 トラック溝
6 ローラ案内面
8 軸(シャフト)
11 ローラ(アウタリング)
12 インナリング
13 針状ころ
16 硬化層
30 中心孔
31 胴部
32 脚軸
33 中間部
34 雌スプライン
P 第1領域
Q 第2領域
Claims (6)
- 円周方向の三カ所に継手軸方向に延びるトラック溝を備え、各トラック溝が継手円周方向に対向して配置された一対のローラ案内面を有する外側継手部材と、
中心孔を有する胴部と、当該胴部の半径方向に突出した三つの脚軸と、前記胴部と脚軸の間に位置し、前記脚軸の軸線を含む断面が曲線状をなす中間部とを備え、鋼材で形成されたトリポード部材と、
前記各脚軸に装着されるローラと、
前記脚軸に外嵌され、前記ローラを回転自在に支持するインナリングとを有し、
前記ローラが前記ローラ案内面に沿って前記外側継手部材の軸方向に移動可能であり、
前記ローラと前記インナリングが、前記脚軸に対して揺動可能のローラユニットを構成し、
前記トリポード部材の芯部における炭素含有量を0.23~0.44%とし、
前記脚軸の表面に、浸炭層の硬化層が設けられたトリポード型等速自在継手において、
前記トリポード部材の中間部に、前記脚軸の軸線を含む、継手軸方向と直交する方向の断面で曲率半径Raを有する第1領域と、前記脚軸の軸線を含む、継手軸方向の断面で曲率半径Rbを有する第2領域とを設け、かつRa>Rbとしたことを特徴とするトリポード型等速自在継手。 - 前記第1領域と、前記第2領域との間に、両領域と滑らかにつながる接続領域Sを設けた請求項1に記載のトリポード型等速自在継手。
- 前記外側継手部材のローラ案内面のピッチ円直径をPCDとして、Ra/PCD≧0.0850にした請求項1または2に記載のトリポード型等速自在継手。
- 前記トリポード部材の胴部の内周面に形成されたスプラインの大径部から前記第1領域までの最小距離をtとして、t/PCD≧0.145にした請求項3に記載のトリポード型等速自在継手。
- 前記トリポード部材の脚軸の表面硬度が、653HV以上である請求項1~4の何れか1項に記載のトリポード型等速自在継手。
- 前記トリポード部材の内部硬度が、513HV以上である請求項1~5の何れか1項に記載のトリポード型等速自在継手。
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