WO2011114505A1 - 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
- Publication number
- WO2011114505A1 WO2011114505A1 PCT/JP2010/054783 JP2010054783W WO2011114505A1 WO 2011114505 A1 WO2011114505 A1 WO 2011114505A1 JP 2010054783 W JP2010054783 W JP 2010054783W WO 2011114505 A1 WO2011114505 A1 WO 2011114505A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- trunnion
- tripod
- spherical roller
- constant velocity
- universal joint
- Prior art date
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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
- 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
- F16D3/2055—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 having three pins, i.e. true tripod joints
Definitions
- the present invention relates to a tripod type constant velocity universal joint, and can be used for power transmission devices of automobiles, various industrial machines and the like.
- the outer joint member is connected to the drive shaft or the driven shaft
- the inner joint member is connected to the driven shaft or the drive shaft
- the torque transmission member is interposed therebetween
- the drive shaft and the driven shaft Is designed to transmit torque even in the angled state, and is roughly divided into a fixed type that allows only angular displacement and a sliding type that allows not only angular displacement but also axial displacement (plunging).
- the tripod type constant velocity universal joint belongs to the sliding type, and as shown in FIG. 4, the outer ring 110 as an outer joint member, the tripod 120 as an inner joint member, and the spherical roller 130 as a torque transmission member are mainly configured. It is an element.
- the outer ring 110 includes a mouth portion 112 and a stem portion (not shown), and a spline (or serration, hereinafter the same) shaft portion formed on the stem portion is connected to be able to transmit torque with the driving shaft or the driven shaft.
- the mouse portion 112 has a cup shape, and three axially extending track grooves 114 are formed on the inner circumference at equal intervals in the circumferential direction. Roller guide surfaces 116 are formed on both side walls of the track groove 114.
- the tripod 120 is composed of a boss 122 and three trunnions 126, and is connected with a driven shaft or a driving shaft so as to be capable of transmitting torque by means of a spline hole 124 formed in the boss 122.
- the three trunnions 126 are equally spaced in the circumferential direction of the boss 122 and each project radially from the boss 122.
- Each trunnion 126 has a cylindrical shape, and an annular groove 128 is formed near the tip.
- a spherical roller 130 is attached to each trunnion 126.
- a plurality of needle rollers 132 are interposed between the spherical roller 130 and the trunnion 126 in a full roller state.
- the spherical roller 130 is rotatable relative to the trunnion 126.
- An inner washer 134 and an outer washer 136 are disposed on both axial ends of the needle roller 132.
- the inner washer 134 is seated on the shoulder of the base of the trunnion 126.
- a circlip 138 is mounted in the annular groove 128 of the trunnion 126 to restrict the movement of the outer washer 136 to the distal end of the trunnion 126. Accordingly, movement of the needle roller 132 to the tip end side of the trunnion 126 is restricted (retaining).
- Patent No. 3615987 gazette
- the conventional tripod type constant velocity universal joint requires many parts such as the spherical roller 130, the needle roller 132, the inner washer 134, the outer washer 136 and the circlip 138 in addition to the outer ring 110 and the tripod 120.
- the large number of parts in this way is a problem from the viewpoint of cost and the like. Accordingly, an object of the present invention is to reduce the number of parts of a tripod type constant velocity universal joint.
- the tripod type constant velocity universal joint has an outer ring having three track grooves extending in the axial direction on the inner periphery and a roller guide surface formed on both side walls of each track groove, a radius from the boss and its boss
- the trunnion and the spherical roller are in direct contact with each other, and a tripod roller comprising three trunnions projecting in a direction and a spherical roller supported rotatably and axially movably with respect to each trunnion and inserted in the track groove,
- a void is provided between the trunnion and the spherical roller in the axial direction of the boss of the tripod.
- the parts constituting the tripod type constant velocity universal joint become only three points of the outer ring (outer joint member), the tripod (inner joint member) and the spherical roller (torque transmission member), and the number of parts is greatly reduced.
- the outer peripheral surface of the trunnion also has a cylindrical shape, and a desired gap is provided between the cylindrical surfaces of the two and the spherical roller is fitted to the trunnion, the outer surface of the trunnion and the spherical roller
- the contact area with the inner peripheral surface is large, and the frictional resistance to relative rotation between the trunnion and the spherical roller is large.
- the presence of grease between the outer peripheral surface of the trunnion and the inner peripheral surface of the spherical roller is not good until the clearance necessary to fit the spherical roller into the trunnion.
- the cylindrical outer peripheral surface of the trunnion can be cut out over a predetermined region including the portion directed in the axial direction of the boss.
- the outer peripheral surface shape of the longitudinal cross section of the spherical roller is preferably an arc having a center of curvature on the rotation axis of the spherical roller.
- the outer peripheral surface of the spherical roller is a partial spherical surface, which facilitates rotation in the roller guide surface.
- the cross section of the trunnion can be a part of a perfect circle, that is, a perfect circle, at least in a portion excluding the cut portion, that is, a portion in contact with the inner peripheral surface of the spherical roller.
- the cross section of the trunnion may have a non-round shape at least in a portion in contact with the inner peripheral surface of the spherical roller.
- non-perfect circular shapes include arcs having a center at a position away from the axis of the trunnion and elliptical shapes. In the case of the oval shape, the major axis direction outer peripheral surface of the oval contacts the inner diameter of the spherical roller.
- the clearance between the trunnion and the spherical roller gradually widens from the contact portion of the trunnion and the spherical roller toward the void, so it becomes easy to draw in the grease. Instead, since the contact width between the trunnion and the spherical roller is reduced, the spherical roller is likely to rock. Therefore, the rolling of the spherical roller is promoted, and a lower vibration constant velocity universal joint is realized.
- At least a portion of the trunnion in contact with the inner peripheral surface of the spherical roller is finished by grinding or hardened steel cutting.
- hardened steel cutting by using so-called dry cutting, the grinding oil (coolant) necessary for grinding is not used, which is excellent in terms of environment.
- the trunnion is in contact with the spherical roller and plays a role of transmitting torque, so strength and durability are required.
- various methods are known for surface hardening treatment, for example, any of carburizing, carbonitriding and induction hardening may be selected.
- a hardened layer may be provided on at least the root and outer peripheral surface of the trunnion. Induction hardening is advantageous in that it can be locally hardened where it is needed.
- the present invention it is possible to achieve a significant reduction in the number of parts of the tripod constant velocity universal joint by setting the parts constituting the tripod constant velocity universal joint to only three points of the outer ring, the tripod and the spherical roller. Further, by providing a space between the trunnion and the spherical roller in the axial direction of the boss of the tripod, the interposition of grease can be improved and the rolling of the spherical roller can be promoted. Therefore, during plunging of the tripod type constant velocity universal joint, the spherical roller rolls smoothly along the roller guide surface, which contributes to the reduction of the slide resistance and the reduction of the induced thrust.
- the tripod type constant velocity universal joint shown in FIGS. 1 and 2 is constituted by three members of an outer ring 10 as an outer joint member, a tripod 20 as an inner joint member, and a spherical roller 30 as a torque transfer member.
- this tripod type constant velocity universal joint is constituted only by three parts of the outer ring 10, the tripod 20 and the spherical roller 30. Needless to say, the total number of spherical rollers 30 is three.
- the outer ring 10 comprises a mouth portion 12 and a stem portion (not shown), and a spline shaft portion formed on the stem portion is connected to the driving shaft or the driven shaft so as to be capable of transmitting torque.
- the mouse portion 12 is cup-shaped and has three track grooves 14 on its inner periphery.
- the track grooves 14 are formed at equal intervals in the circumferential direction of the mouse portion 12 and extend in parallel with the axis X of the mouse portion 12.
- Roller guide surfaces 16 are formed on both side walls of each track groove 14.
- the roller guide surface 16 is a part of a cylindrical surface, and the cross section perpendicular to the axis X is a part of a perfect circle.
- the tripod 20 is composed of a boss 22 and three trunnions 26, and is connected to the driven shaft or the driving shaft so as to be capable of transmitting torque by means of the spline holes 24 of the boss 22.
- the three trunnions 26 are equally spaced in the circumferential direction of the boss 22 and each project in the radial direction of the boss 22.
- a spherical roller 30 is attached to each trunnion 26, and the trunnion 26 and the spherical roller 30 are in direct contact with each other.
- the spherical roller 30 is accommodated in the track groove 14 and directly contacts the roller guide surface 16 at the outer peripheral surface 32.
- the spherical roller 30 is ring-shaped and has a partial spherical outer peripheral surface 32 and a cylindrical inner peripheral surface 34.
- the outer peripheral surface 32 of the spherical roller 30 is spherical. It is a part of a spherical surface having a center of curvature on the rotation axis of the roller 30, ie, a partial spherical shape.
- the shape of the outer peripheral surface 32 in the longitudinal cross section of the spherical roller 30 is a circular arc having the center of curvature on the rotation axis of the spherical roller 30.
- the radius of curvature of the outer peripheral surface 32 of the spherical roller 30 is substantially the same as the radius of curvature of the roller guide surface 16, or the radius of curvature of the roller guide surface 16 is larger.
- the shape of the outer peripheral surface 32 in the vertical cross section of the spherical roller 30 may be a circular arc having a center of curvature at a position away from the rotation axis of the spherical roller 30.
- the outer peripheral surface 32 of the spherical roller 30 is a part of a torus (ring).
- the trunnion 26 has a surface portion 28 orthogonal to the axis Y of the boss 22.
- the surface portion 28 is axially retracted from the virtual cylindrical surface of the trunnion 26.
- a space 36 is formed between the surface portion 28 of the trunnion 26 and the inner circumferential surface 34 of the spherical roller 30 in the direction of the axis Y of the boss 22.
- the surface portion 28 is a flat surface, so the cavity 36 has a crescent-shaped cross section.
- the interposition of the lubricant (grease) between the trunnion 26 and the spherical roller 30 is improved, and it can be expected that the rolling of the spherical roller 30 is promoted.
- the surface portion 28 is flat, but not necessarily flat, as long as the desired space 36 can be formed with the inner circumferential surface of the spherical roller 30, for example, other than the flat surface, for example It may be convex or concave. Also, in the illustrated embodiment, the surface portion 28 exists over the entire length of the trunnion 26 and is flush with the end face of the boss 22 but does not have to be flush with the end face of the boss 22. However, if the surface portion 28 is flat and flush with the end face of the boss 22, it is relatively easy to process, which is advantageous in manufacturing.
- the tripod 20 is generally formed by forging, and then the outer peripheral surface of the spline hole 24 and the trunnion 26 is finished by machining.
- the surface portion 28 may be formed simultaneously in the process of forging, or may be subjected to cutting after forging into a cylindrical shape.
- the trunnion is specifically designated 26a.
- the cross section perpendicular to the axis Z (FIG. 2) of the trunnion 26a, that is, the cross section, is a part of a perfect circle, that is, a perfect circle shape at least in a region in contact with the inner peripheral surface 34 of the spherical roller 30.
- the true circle is centered on the axis Z of the trunnion 26a.
- the trunnion is specifically designated 26b.
- the cross section of the trunnion 26 b may have a non-perfect circular shape at least in a region in contact with the inner peripheral surface 34 of the spherical roller 30.
- the outer peripheral surface shape of the transverse section of the trunnion 26b is an arc having a center of curvature at a position away from the axis Z of the trunnion 26b, in other words, an arc having no center of curvature on the axis Z of the trunnion 26b. It is an example.
- the radius of curvature of the arc is represented by the symbol R.
- the spherical roller 30 swings more easily with the load point as the fulcrum, as compared with the case where the cross-sectional shape of the trunnion 26b is made into a perfect circle shape as described above.
- a dot-and-dash line perpendicular to the roller guide surface 16 represents the torque load direction. And the intersection of this dashed-dotted line and the roller guide surface 16 becomes a load point.
- FIGS. 3A and 3B as can be seen from the slight clearance a on the non-load side, when torque is transmitted from the outer ring 10, a force is applied from the right side to the left side in the same figure. Is shown.
- the cross-sectional shape of the trunnion 26 may be elliptical as another example of the non-round shape.
- the cross-sectional shape is similar to that of the oval shown in FIG. 3B, and therefore, the same effect as described for the swing of the spherical roller 30 can be expected for the configuration of FIG. 3B.
- the vibration generated in the axial direction of the joint transmitted from the engine to the drive shaft can be absorbed to suppress the vibration (slide) Reduced resistance).
- the rocking motion of the spherical roller 30 makes it easier for the spherical roller 30 to roll, thereby reducing the force (induced thrust) generated in the axial direction of the joint. .
- a structure in which a spherical roller is mounted on the outer periphery of a trunnion via a plurality of needle rollers is general, but the outer ring and the tripod operate When transmitting the torque while taking the angle, since each spherical roller and the roller guide surface cross each other obliquely with the inclination of the trunnion, a slip occurs between them, and the smooth rolling of the spherical roller There is a problem that it is hindered and the induced thrust becomes large. Further, there is a problem that the sliding resistance when the outer ring and the tripod are relatively displaced in the axial direction is increased by the frictional force between each spherical roller and the roller guide surface.
- the induced thrust means the axial force of the joint generated by the friction inside the joint when torque is applied at an angle during rotation of the constant velocity universal joint, and in the case of the tripod type, it is mainly It appears strongly as a third-order component.
- the slide resistance is a sliding type joint such as a tripod type constant velocity universal joint, and means the magnitude of the axial friction force generated when the outer ring and the tripod slide relative to each other. It is desirable to reduce induced thrust and slide resistance as much as possible because they cause vibration and noise of the vehicle body, affect the NVH characteristics of the vehicle, and lower the design freedom of the vehicle underbody.
- the NVH refers to noise (vibration), vibration (vibration), harshness (coarse ride quality), and is a generic term for reduction of vibration noise of a vehicle.
- the NVH problem of automobiles is the point of solution by reducing the magnitude of the induced thrust and sliding resistance of the joint.
- the induced thrust and sliding resistance of a joint tend to depend on the magnitude of the operating angle. Therefore, when it applies to the drive shaft of a motor vehicle, it leads to the design restrictions that an operating angle can not be enlarged. Therefore, in order to increase the degree of freedom in designing the underbody of a car, low stabilization of induced thrust and slide resistance has been a problem.
- the trunnion 26 is surface-hardened to provide a hardened layer.
- various methods are known for surface hardening treatment, for example, any of carburizing, carbonitriding and induction hardening may be selected. In the case of induction hardening, it is sufficient if a hardened layer is provided at least at the base of trunnion 26 and the outer peripheral surface.
- Carburizing includes solid carburizing, liquid carburizing, gas carburizing and the like.
- Carbonitriding is a method of simultaneously diffusing carbon and nitrogen into the surface layer of steel and hardening only the surface by subsequent hardening.
- a salt bath such as sodium cyanide. The higher the temperature of carbon and the lower the more easily nitrogen infiltrates, the reaction is carried out at 800 to 900.degree.
- Induction hardening mainly uses medium carbon steel with a carbon content of 0.3 to 0.5%, and after hardening and tempering in advance to provide sufficient strength and toughness for the entire cross section of the steel, induction heating by high frequency current is used. It is a method of rapidly heating, hardening only from the surface austenitized state, and hardening only the surface. By devising the shape of the coil used for high frequency heating, only a necessary part can be locally heated.
- Hardened steel cutting is a method of cutting a work after quenching using a high hardness tool such as a CBN (cubic boron nitride) sintered body tool.
- a high hardness tool such as a CBN (cubic boron nitride) sintered body tool.
- dry cutting the grinding oil (coolant) necessary for grinding is not used, which is excellent in terms of environment.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Friction Gearing (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
そこで、この発明の目的は、トリポード型等速自在継手の部品点数を削減することにある。
図1および図2に示すトリポード型等速自在継手は、外側継手部材としての外輪10と、内側継手部材としてのトリポード20と、トルク伝達部材としてのスフェリカルローラ30の3部材で構成されている。図1から明らかなように、このトリポード型等速自在継手は外輪10とトリポード20とスフェリカルローラ30の3部品のみで構成されている。なお、スフェリカルローラ30の全数が3個であるのは言うまでもない。
12 マウス部
14 トラック溝
16 ローラ案内面
20 トリポード(内側継手部材)
22 ボス
24 スプライン孔
26、26a、26b トラニオン
28 面部分
30 スフェリカルローラ(トルク伝達部材)
32 外周面
34 内周面
36 空所
Claims (9)
- 内周に軸線と平行な3本のトラック溝を有し各トラック溝の両側壁にローラ案内面を形成した外輪と、ボスとそのボスから半径方向に突出した3本のトラニオンとからなるトリポードと、各トラニオンに回転および軸方向移動可能に支持されトラック溝内に挿入されたスフェリカルローラとからなり、トラニオンとスフェリカルローラを直接接触させ、トリポードのボスの軸線方向において、トラニオンとスフェリカルローラとの間に空所を設けたトリポード型等速自在継手。
- トラニオンの横断面は、少なくともスフェリカルローラの内周面と接触する部分において、真円形状である請求項1のトリポード型等速自在継手。
- トラニオンの横断面は、少なくともスフェリカルローラの内周面と接触する部分において、非真円形状である請求項1のトリポード型等速自在継手。
- 前記非真円形状は楕円形状である請求項3のトリポード型等速自在継手。
- 前記非真円形状はトラニオン軸線から離れた位置に曲率中心をもつ円弧である請求項3のトリポード型等速自在継手。
- スフェリカルローラの縦断面における外周面形状は、スフェリカルローラの軸線上に曲率中心をもつ円弧である請求項1~5のいずれか1項のトリポード型等速自在継手。
- トラニオンの、少なくともスフェリカルローラの内周面と接触する部分は、研削または焼入れ鋼切削で仕上げてある請求項1~6のいずれか1項のトリポード型等速自在継手。
- トラニオンに表面熱処理による硬化層を設けた請求項1~7のいずれか1項のトリポード型等速自在継手。
- トラニオンの少なくとも付け根および外周面に高周波焼入れによる硬化層を設けた請求項8のトリポード型等速自在継手。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/054783 WO2011114505A1 (ja) | 2010-03-19 | 2010-03-19 | トリポード型等速自在継手 |
US13/634,371 US20120329564A1 (en) | 2010-03-19 | 2010-03-19 | Tripod constant velocity universal joint |
CN2010800655465A CN102859219A (zh) | 2010-03-19 | 2010-03-19 | 三球销型等速万向接头 |
DE112010005406T DE112010005406T5 (de) | 2010-03-19 | 2010-03-19 | Tripode-Konstantgeschwindigkeits-Kardangelenk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/054783 WO2011114505A1 (ja) | 2010-03-19 | 2010-03-19 | トリポード型等速自在継手 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011114505A1 true WO2011114505A1 (ja) | 2011-09-22 |
Family
ID=44648633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/054783 WO2011114505A1 (ja) | 2010-03-19 | 2010-03-19 | トリポード型等速自在継手 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120329564A1 (ja) |
CN (1) | CN102859219A (ja) |
DE (1) | DE112010005406T5 (ja) |
WO (1) | WO2011114505A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8251827B2 (en) * | 2007-11-29 | 2012-08-28 | Hyundai Wia Corporation | Constant velocity joint of tripod type |
JP2017180675A (ja) * | 2016-03-30 | 2017-10-05 | Ntn株式会社 | トリポード型等速自在継手およびトリポード部材の熱処理方法 |
DE102018118634A1 (de) * | 2018-08-01 | 2020-02-06 | Schaeffler Technologies AG & Co. KG | Verfahren zur Montage einer Tripodenrolle, Tripodenrolle sowie Gleichlaufgelenk mit der Tripodenrolle |
JP7358046B2 (ja) * | 2018-12-27 | 2023-10-10 | Ntn株式会社 | トリポード型等速自在継手 |
JP7211261B2 (ja) * | 2019-05-17 | 2023-01-24 | 株式会社ジェイテクト | トリポード型等速継手 |
JP7398310B2 (ja) | 2020-03-26 | 2023-12-14 | 本田技研工業株式会社 | 等速ジョイント |
DE102021105055A1 (de) | 2021-03-03 | 2022-09-08 | Schaeffler Technologies AG & Co. KG | Podenrolle für ein Gleichlaufgelenk, Verfahren zur Herstellung einer Podenrolle sowie Gleichlaufgelenk mit der Podenrolle |
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JP2002054649A (ja) * | 2000-08-11 | 2002-02-20 | Ntn Corp | トリポード型等速自在継手 |
TWI298767B (en) * | 2002-10-25 | 2008-07-11 | Ntn Toyo Bearing Co Ltd | Tripod type constant velocity joint |
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DE602005003991T2 (de) * | 2004-08-03 | 2008-12-11 | Ntn Corporation | Gleichlauftripodegelenk |
JP4926584B2 (ja) * | 2006-07-18 | 2012-05-09 | Ntn株式会社 | トリポード型等速自在継手 |
JP5349756B2 (ja) * | 2007-01-17 | 2013-11-20 | Ntn株式会社 | 等速自在継手 |
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2010
- 2010-03-19 WO PCT/JP2010/054783 patent/WO2011114505A1/ja active Application Filing
- 2010-03-19 CN CN2010800655465A patent/CN102859219A/zh active Pending
- 2010-03-19 DE DE112010005406T patent/DE112010005406T5/de not_active Withdrawn
- 2010-03-19 US US13/634,371 patent/US20120329564A1/en not_active Abandoned
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JP2005133890A (ja) * | 2003-10-31 | 2005-05-26 | Ntn Corp | トリポード型等速自在継手 |
JP2008240816A (ja) * | 2007-03-26 | 2008-10-09 | Jtekt Corp | 摺動式トリポード形等速ジョイント |
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CN102859219A (zh) | 2013-01-02 |
US20120329564A1 (en) | 2012-12-27 |
DE112010005406T5 (de) | 2012-12-27 |
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