WO2023032634A1 - 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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- WO2023032634A1 WO2023032634A1 PCT/JP2022/030649 JP2022030649W WO2023032634A1 WO 2023032634 A1 WO2023032634 A1 WO 2023032634A1 JP 2022030649 W JP2022030649 W JP 2022030649W WO 2023032634 A1 WO2023032634 A1 WO 2023032634A1
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- WO
- WIPO (PCT)
- Prior art keywords
- leg shaft
- peripheral surface
- joint
- inner ring
- constant velocity
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 60
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 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 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
-
- 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
-
- 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 (differential side) of the intermediate shaft, and a fixed constant velocity universal joint is connected to the outboard side (wheel side).
- 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. Reference 1). Since the double roller type allows the rollers to swing and oscillate about the leg shaft, compared to the single roller type, induced thrust (axial force induced by friction between parts inside the joint) and sliding It has the advantage that a reduction in resistance can be achieved.
- an inner ring is assembled to the inner circumference of a roller to form a roller unit, and then this roller unit is externally fitted to each leg shaft of the tripod member, and these are attached to the outer side. It is assembled to the inner circumference of the joint member.
- a functionally necessary gap is provided between the roller unit and the customer shaft. Therefore, when the roller unit and the tripod member are attached to or detached from the outer joint member for assembly or repair, or when the drive shaft is attached or detached from the vehicle, the roller unit may fall off the leg shaft.
- Patent Document 2 describes, as shown in FIG. A portion 124 is provided.
- Patent Document 2 describes that the falling-off prevention function can be exhibited by setting the radial projection amount (af1-ag1) of the protrusion and the width h in the leg axis direction to a predetermined value or more. However, if these are made too large, it becomes difficult to incorporate the roller unit into the pedestal.
- Patent Document 2 does not mention the width of the protrusion in the circumferential direction of the leg axis.
- the width of the protrusion in the circumferential direction of the leg axis has been considered as follows. That is, in the double roller type tripod constant velocity universal joint, as shown in FIG. They are in contact with each other in the long axis direction of the shaft 122 (direction orthogonal to the joint axis), and a gap is provided between them in the short axis direction of the leg shaft 122 (joint axis direction).
- the leg shaft of the tripod member When assembling or repairing the tripod type constant velocity universal joint, when attaching or detaching the tripod member and roller unit to or from the outer joint member, or when attaching or detaching the drive shaft to or from the vehicle, the leg shaft of the tripod member In many cases, the roller unit is tilted (see FIG. 8). When the roller unit inclines with respect to the leg shaft in this way, the gap between the inner peripheral surface of the inner ring of the roller unit and the outer peripheral surface of the leg shaft is apparently reduced (see the chain line in FIG. 7).
- the present invention which has been made based on the above knowledge, comprises an outer joint member having axially extending track grooves formed at three locations in the circumferential direction, a tripod member having three radially protruding leg shafts, and the a roller unit rotatably supported by the leg shaft and housed in the track groove,
- the roller unit has a roller and an inner ring that is fitted onto the leg shaft and rotatably supports the roller,
- the inner peripheral surface of the inner ring has a convex curved surface in which an axially intermediate portion of the inner ring protrudes toward the inner diameter side,
- the inner peripheral surface of the inner roller is in contact with the outer peripheral surface of the leg shaft in a direction orthogonal to the joint axis, and forms a gap between the inner peripheral surface and the outer peripheral surface of the leg shaft in the joint axial direction.
- a protrusion is provided in a region of the outer peripheral surface of the leg shaft that is on the shaft end side of the inner ring and includes both end portions in a direction orthogonal to the joint axis,
- a ratio T/ag1 between a dimension T of the protrusion in the direction of the joint axis and a dimension ag1 of the outer peripheral surface of the leg shaft in a direction perpendicular to the axis of the joint is 0.3 or more.
- the protrusions are formed at the same time as grinding the ground surfaces. can be done. In this case, the protrusions are provided over the entire area of the ground surface in the joint axial direction.
- the protrusion amount of the protrusion is 0.015 to 0.15 mm in the entire joint axial direction of the protrusion.
- the width of the protrusion in the leg axis direction is 0.1 to 0.5 mm over the entire joint axial direction of the protrusion.
- the function of preventing the roller unit from falling off from the leg shaft is improved without degrading the ease of assembling the roller unit and the tripod member.
- FIG. 1 is a cross-sectional view of a tripod-type constant velocity universal joint according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view taken along line KK of FIG. 1
- FIG. 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 constant velocity universal joint of FIG. 1 has taken an operating angle
- FIG. 3 is an enlarged view of FIG. 2
- FIG. 6 is a cross-sectional view of part A in FIG. 5
- 4 is an enlarged cross-sectional view showing the inner ring and the leg shaft of FIG. 3
- FIG. 5 is a cross-sectional view showing a state in which the roller unit is tilted with respect to the leg shaft;
- FIG. 4 is a cross-sectional view showing a step of grinding the leg shaft;
- FIG. 10 is a cross-sectional view of a conventional tripod type constant velocity universal joint;
- FIG. 11 is a cross-sectional view of the inner ring and leg shaft of the constant velocity universal joint of FIG. 10;
- the tripod type constant velocity universal joint 1 is of double roller type. As shown in FIGS. 1 and 2, the tripod type constant velocity universal joint 1 is mainly composed of an outer joint member 2, a tripod member 3, 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 axial direction are formed on the inner peripheral surface at regular intervals in the circumferential direction.
- a roller guide surface 6 is formed in each track groove 5 so as to face each other in the circumferential direction of the outer joint member 2 and extend in the axial direction of the outer joint member 2 .
- a tripod member 3 and a roller unit 4 are housed inside the outer joint member 2 .
- the tripod member 3 integrally has a trunk portion 31 having a central hole 30 and three leg shafts 32 projecting radially from trisecting positions of the trunk portion 31 in the circumferential direction.
- 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 center hole 30 of the trunk portion 31 .
- One end surface of the tripod member 3 is engaged with a shoulder portion 82 provided on the shaft 8 , and a retaining ring 10 attached to the tip of the shaft 8 is engaged with the end surface of the tripod member 3 , so that the tripod member 3 is attached to the shaft 8 .
- the roller unit 4 has a roller 11 and an annular inner ring 12 arranged on the inner periphery of the roller 11 and fitted on the leg shaft 32, and is accommodated in the track groove 5 of the outer joint member 2. there is
- the roller 11 is rotatably supported by the inner ring 12 .
- a large number of needle rollers 13 interposed between the roller 11 and the inner ring 12 make them relatively rotatable.
- the roller unit 4 consisting of the inner ring 12, the needle rollers 13, and the rollers 11 is structured so as not to be separated by the washers 14 and 15. As shown in FIG.
- the outer peripheral surface of the roller 11 is a convex curved surface whose generatrix is an arc having the center of curvature on the axis of the leg shaft 32 .
- the roller 11 is movable along the roller guide surface 6 in the joint axis O direction.
- the outer peripheral surface of the roller 11 is in angular contact with the roller guide surface 6 .
- the needle rollers 13 have the cylindrical inner peripheral surface of the roller 11 as an outer raceway surface and the cylindrical outer peripheral surface of the inner ring 12 as an inner raceway surface. placed.
- each leg shaft 32 of the tripod member 3 forms a straight line parallel to the axis P in any longitudinal section including the axis P of the leg shaft 32 .
- the outer peripheral surface of the leg shaft 32 has a substantially elliptical shape in a cross section perpendicular to the axis P 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 axis O of the joint, that is, in the direction of the long axis a.
- a slight gap is provided between the outer peripheral surface of the leg shaft 32 and the inner peripheral surface 12a of the inner ring 12 in the direction perpendicular to the joint axis O for assembling the two.
- the outer peripheral surface of the leg shaft 32 does not contact the inner peripheral surface 12a of the inner ring 12, and there is a gap between them perpendicular to the direction of the joint axis O.
- a gap m is formed which is much larger than the directional gap.
- the inner peripheral surface 12a of the inner ring 12 has a convex curved surface in which an intermediate portion in the direction of the axis P of the inner ring 12 protrudes to the inner diameter side (see FIG. 5).
- the inner peripheral surface 12a of the inner ring 12 is formed by a convex curved surface having an arcuate cross section, and tapered surfaces 12b are provided on both sides in the direction of the axis P.
- the inner peripheral surface 12a of the inner ring 12 is provided with a convex curved surface in this way, and that the cross-sectional shape of the leg shaft 32 is substantially elliptical as described above, there is a joint axial line O direction between the leg shaft 32 and the inner ring 12.
- the inner ring 12 can swing and swing with respect to the leg shaft 32 .
- the inner ring 12 and the roller 11 are assembled to be relatively rotatable via the needle rollers 13, so that the roller 11 can swing and swing with respect to the leg shaft 32 together with the inner ring 12. is. That is, the axes of the rollers 11 and the inner ring 12 can be tilted with respect to the axis of the leg shaft 32 within a plane containing the axis of the leg shaft 32 (see FIG. 4).
- the cross section of the leg shaft 32 is substantially elliptical, and the longitudinal section of the inner peripheral surface 12a of the inner ring 12 is an arcuate convex section.
- the outer peripheral surface and the inner peripheral surface 12a of the inner ring 12 are in contact with each other in a narrow area close to point contact. Therefore, the force that tends to incline the roller unit 4 is reduced, and the stability of the posture of the roller 11 is improved.
- the tripod member 3 is manufactured from a steel material through the main processes of forging (cold forging) ⁇ machining (turning) ⁇ broaching of splines 34 ⁇ heat treatment ⁇ grinding.
- a region of the outer peripheral surface of the leg shaft 32 that includes both ends in the longitudinal direction that come into contact with the inner ring 12 is ground.
- both longitudinal ends of the outer peripheral surface of the leg shaft 32 and their vicinities are ground, and the circumferential region between them is not ground. That is, as shown in FIG. 5, ground surfaces 32a are formed at both ends in the longitudinal direction of the outer peripheral surface of the pedestal 32, and the areas between them in the circumferential direction are non-ground areas.
- the ground surface 32a is provided up to the tip of the outer peripheral surface of the leg shaft 32 . This ground surface 32 a contacts the inner peripheral surface 12 a of the inner ring 12 .
- the projection 40 which is a characteristic configuration of the present invention, will be described below.
- a protrusion 40 is provided on the outer peripheral surface of the leg shaft 32 of the tripod member 3 .
- the protrusion 40 is provided closer to the shaft end than the inner ring 12 on the outer peripheral surface of the leg shaft 32 .
- the protrusions 40 are provided in regions of the outer peripheral surface of the leg shaft 32 that include both ends in the direction of the major axis a (see FIG. 7).
- a projection 40 is provided on the ground surface 32a of the outer peripheral surface of the leg shaft 32, and in particular, is provided over the entire area of the ground surface 32a in the peripheral direction of the leg shaft (joint axis O direction) (see FIG. 8).
- the protrusion 40 is provided on the grinding surface 32a slightly closer to the base end (center side of the tripod member 3) than the tip of the leg shaft 32 (see FIG. 5). Therefore, ground surfaces 32a are provided on both sides of the protrusion 40 in the direction of the leg shaft axis P. As shown in FIG.
- the protrusion 40 extends along the circumferential direction of the leg shaft 32.
- a ratio T/ag1 between the dimension T of the protrusion 40 in the direction of the joint axis O and the dimension ag1 of the leg shaft 32 in a direction orthogonal to the joint axis O is 0.3 or more. It is said that For example, when the major axis ag1 of the leg shaft 32 is 20 mm, the dimension T of the projection 40 in the joint axis O direction is set to 6 mm or more.
- the major axis ag1 of the leg shaft 32 is measured in a region (ground surface 32a) in contact with the inner ring 12. As shown in FIG. 7, the gap between the leg shaft 32 and the inner ring 12 and the protrusion amount of the protrusion 40 are exaggerated.
- the amount of protrusion ⁇ of the protrusion 40 with respect to the area adjacent to the leg shaft axis P direction is constant in the circumferential direction and is set within the range of 0.015 to 0.15 mm.
- the difference (af1- ⁇ Ds1) between the circumscribed circle diameter af1 of the protrusion 40 and the minimum inner diameter ⁇ Ds1 of the inner ring 12 is 0.02 to 0.20 mm.
- the width h (see FIG. 6) of the projection 40 in the direction of the leg shaft axis P is constant in the circumferential direction and is set within the range of 0.1 to 0.5 mm.
- the inner ring 12 and the leg Interference with the protrusions 40 of the shafts 32 prevents the roller units 4 from coming off the leg shafts 32 of the tripod members 3 .
- the Circumferential center portions of the projections 40 interfere with the inner peripheral surface of the inner ring 12 (see FIG. 7). At this time, since the vicinity of both circumferential ends of each projection 40 is separated from the inner peripheral surface of the inner ring 12, it does not contribute to the retaining function.
- the protrusions 40 provided on the outer peripheral surface of the leg shaft 32 extend to a region that was conventionally thought not to interfere with the inner ring 12 .
- the dimension T of the protrusion 40 in the direction of the joint axis O is larger than the width of the region where the leg shaft 32 and the inner ring 12 may interfere with each other when they are coaxially arranged.
- the region Q adjacent to the one circumferential side of the maximum diameter portion 32 b of the outer peripheral surface of the leg shaft 32 becomes the inner peripheral surface of the inner ring 12 .
- the region 40a near one end in the circumferential direction interferes with the inner peripheral surface 12a of the inner ring 12 first (in FIG. 8, the interference region is indicated by fine hatching). ).
- the region 40a near one end in the circumferential direction of the protrusion 40 is formed inside the inner ring 12 before the central portion in the circumferential direction. Easy to interfere with the surrounding surface.
- the interference area between the protrusion 40 and the inner ring 12 widens toward the center of the protrusion 40 in the circumferential direction.
- interference between the protrusion 40 and the inner ring 12 can be reduced.
- the force for preventing the roller unit 4 from coming off from the leg shaft 32 can be increased.
- the protruding portion 40 can be formed by machining such as cutting or plastic working such as crimping.
- the protrusion 40 is ground simultaneously with the grinding surface 32a provided on the leg shaft 32 .
- the grindstone 50 is pressed against the outer peripheral surface of the leg shaft 32 while being rotated relative to the leg shaft 32 for grinding.
- the grindstone 50 is provided with a flat surface 51 and a groove portion 52 .
- the flat surface 51 of the grindstone 50 forms the grinding surface 32 a on the outer peripheral surface of the leg shaft 32
- the groove 52 forms the protrusion 40 .
- the ground surface 32 a of the leg shaft 32 not only the ground surface 32 a of the leg shaft 32 , but also the outer diameter surface and the side surface of the protrusion 40 are surfaces ground by the grindstone 50 .
- the manufacturing cost can be reduced as compared with the case where the projections 40 are formed in a separate process.
- the protrusions 40 are provided over the entire circumference of the ground surface 32a of the leg shaft 32 .
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
前記ローラユニットは、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、
前記インナリングの内周面が、前記インナリングの軸線方向中間部が内径側に突出した凸曲面を有し、
前記インナローラの内周面は、継手軸線と直交する方向で前記脚軸の外周面と接触し、継手軸線方向で前記脚軸の外周面との間に隙間を形成するトリポード型等速自在継手において、
前記脚軸の外周面のうち、前記インナリングよりも軸端側で、継手軸線と直交する方向の両端部を含む領域に突起部を設け、
前記突起部の継手軸線方向寸法Tと、前記脚軸の外周面の継手軸線と直交する方向の寸法ag1との比T/ag1が0.3以上であることを特徴とする。
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 シャフト
11 ローラ
12 インナリング
31 胴部
32 脚軸
32a 研削面
40 突起部
O 継手軸線
P 脚軸軸線
Claims (4)
- 円周方向の三箇所に軸方向に延びるトラック溝が形成された外側継手部材と、半径方向に突出した三つの脚軸を有するトリポード部材と、前記脚軸に回転自在に支持されると共に前記トラック溝に収容されるローラユニットとを備え、
前記ローラユニットは、
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、
前記インナリングの内周面が、前記インナリングの軸線方向中間部が内径側に突出した凸曲面を有し、
前記インナローラの内周面は、継手軸線と直交する方向で前記脚軸の外周面と接触し、継手軸線方向で前記脚軸の外周面との間に隙間を形成するトリポード型等速自在継手において、
前記脚軸の外周面のうち、前記インナリングよりも軸端側で、継手軸線と直交する方向の両端部を含む領域に突起部を設け、
前記突起部の継手軸線方向寸法Tと、前記脚軸の外周面の継手軸線と直交する方向の寸法ag1との比T/ag1が0.3以上であるトリポード型等速自在継手。 - 前記脚軸の外周面のうち、継手軸線と直交する方向の両端部を含む領域に研削面を設け、
前記突起部が、前記研削面の継手軸線方向全域に設けられた請求項1に記載のトリポード型等速自在継手。 - 前記突起部の継手軸線方向全域において、前記突起部の突出量が0.015~0.15mmである請求項1又は2に記載のトリポード型等速自在継手。
- 前記突起部の継手軸線方向全域において、前記突起部の脚軸軸線方向の幅が0.1~0.5mmである請求項1~3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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CN202280057460.0A CN117836531A (zh) | 2021-09-03 | 2022-08-10 | 三球销型等速万向联轴器 |
EP22864219.5A EP4397877A1 (en) | 2021-09-03 | 2022-08-10 | Tripod-type constant velocity universal joint |
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JP2021143955A JP7233497B1 (ja) | 2021-09-03 | 2021-09-03 | トリポード型等速自在継手 |
JP2021-143955 | 2021-09-03 |
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WO2023032634A1 true WO2023032634A1 (ja) | 2023-03-09 |
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JP (1) | JP7233497B1 (ja) |
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WO (1) | WO2023032634A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000320563A (ja) | 1999-03-05 | 2000-11-24 | Ntn Corp | 等速自在継手 |
JP2003097589A (ja) | 2001-09-26 | 2003-04-03 | Ntn Corp | 等速自在継手 |
WO2008117616A1 (ja) * | 2007-03-27 | 2008-10-02 | Ntn Corporation | 自在継手 |
-
2021
- 2021-09-03 JP JP2021143955A patent/JP7233497B1/ja active Active
-
2022
- 2022-08-10 CN CN202280057460.0A patent/CN117836531A/zh active Pending
- 2022-08-10 EP EP22864219.5A patent/EP4397877A1/en active Pending
- 2022-08-10 WO PCT/JP2022/030649 patent/WO2023032634A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000320563A (ja) | 1999-03-05 | 2000-11-24 | Ntn Corp | 等速自在継手 |
JP2003097589A (ja) | 2001-09-26 | 2003-04-03 | Ntn Corp | 等速自在継手 |
WO2008117616A1 (ja) * | 2007-03-27 | 2008-10-02 | Ntn Corporation | 自在継手 |
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EP4397877A1 (en) | 2024-07-10 |
CN117836531A (zh) | 2024-04-05 |
JP7233497B1 (ja) | 2023-03-06 |
JP2023037302A (ja) | 2023-03-15 |
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