又、前記スラスト玉軸受１３ａは、前記トラニオン７ｂの支持梁部２３ａの内側面と前記パワーローラ６ａの外側面との間に設けられ、外輪１６ｂと、複数個の玉とを備える。このうちの外輪１６ｂは、外側面に部分円筒面状の凹部２４ａを、この外側面を径方向に横切る状態で設け、内側面の中央部に支持軸１２ａを、前記外輪１６ｂと一体に固設している。そして、前記外輪１６ｂは、前記凹部２４ａを、前記支持梁部２３ａの円筒状凸面２２ａに係合させる事で、前記トラニオン７ｂに対し、この円筒状凸面２２ａの中心軸を中心とする揺動変位（前記トロイダル型無段変速機を組み立てた状態での、前記各ディスク２、５の軸方向に関する揺動変位）を可能に支持している。そして、前記外輪１６ｂの内側面に設けた外輪軌道１７ａと前記パワーローラ６ａの内側面に設けた内輪軌道との間に前記各玉を転動自在に配置して、前記スラスト玉軸受１３ａを構成すると共に、前記パワーローラ６ａの中心孔の内周面と前記支持軸１２ａの外周面との間にラジアル軸受を設ける事で、このパワーローラ６ａをこの支持軸１２ａの周囲に回転自在に支持する。
The thrust ball bearing 13a is provided between the inner surface of the support beam portion 23a of the trunnion 7b and the outer surface of the power roller 6a, and includes an outer ring 16b and a plurality of balls. Of these, the outer ring 16b is provided with a concave portion 24a having a partially cylindrical surface on the outer side surface in a state of crossing the outer side surface in the radial direction, and a support shaft 12a is fixed integrally with the outer ring 16b at the center of the inner side surface. doing. Then, the outer ring 16b engages the concave portion 24a with the cylindrical convex surface 22a of the support beam portion 23a, so that the outer ring 16b swings and displaces around the central axis of the cylindrical convex surface 22a with respect to the trunnion 7b. (The swing displacement in the axial direction of each of the disks 2 and 5 in the assembled state of the toroidal type continuously variable transmission) is supported. Then, each ball is movably arranged between an outer ring raceway 17a provided on the inner side surface of the outer ring 16b and an inner ring raceway provided on the inner side surface of the power roller 6a, thereby constituting the thrust ball bearing 13a. At the same time, by providing a radial bearing between the inner peripheral surface of the center hole of the power roller 6a and the outer peripheral surface of the support shaft 12a, the power roller 6a is rotatably supported around the support shaft 12a. .
上述の様に構成する本例のトロイダル型無段変速機用パワーローラユニットは、前記突条２８の両外側面を、所謂パーシャルクラウニング形状としている為、前記トロイダル型無段変速機の運転時に、前記トラニオン７ｂが前記外輪１６ｂを設置した側が凹となる方向に弾性変形した場合であっても、前記凹溝２７の内側面と前記突条２８の外側面との当接部のうちの周方向両端部の面圧が、過度に高くなる事を防止できる。従って、前記外輪１６ｂの前記支持梁部２３ａに対する揺動変位の際に、前記凹溝２７の内側面と前記突条２８の外側面との擦れ合い部の摩耗が著しくなる事を防止できて、摩耗粉が潤滑油を汚染する事を抑えられる。この結果、この潤滑油が供給される各部の潤滑状態を長期間に亙って良好に保つと共に、歯車同士の噛合部や転がり軸受の転がり接触部を損傷し難くできて、前記トロイダル型無段変速機用パワーローラユニット、延いては、前記トロイダル型無段変速機全体の耐久性の確保を図り易くできる。又、前記凹溝２７と前記突条２８との寸法関係（これら凹溝２７の内側面と突条２８の外側面との間の隙間の大きさ）を長期間に亙り適正に維持できる為、前記トロイダル型無段変速機によるトルクの伝達方向が逆転する際に、意図しない変速動作が行われる事を長期間に亙り防止して、運転者に違和感を与える事を防止できる。
Since the power roller unit for the toroidal type continuously variable transmission of the present example configured as described above has both outer side surfaces of the protrusion 28 in a so-called partial crowning shape, during operation of the toroidal type continuously variable transmission, Even if the trunnion 7b is elastically deformed in a direction in which the side on which the outer ring 16b is installed is concave, the circumferential direction of the contact portion between the inner surface of the groove 27 and the outer surface of the protrusion 28 It is possible to prevent the surface pressure at both ends from becoming excessively high. Therefore, when the outer ring 16b is oscillated and displaced with respect to the support beam portion 23a, it is possible to prevent the abrasion of the rubbing portion between the inner side surface of the concave groove 27 and the outer side surface of the protrusion 28, and It is possible to prevent the wear powder from contaminating the lubricating oil. As a result, the kept well over the lubricated state of each portion the lubricating oil is supplied to the long term, it can hardly damage the rolling contact portion of the engagement portion and the rolling bearing of the gears, the toroidal continuously variable It is possible to easily ensure the durability of the transmission power roller unit, and thus the entire toroidal continuously variable transmission. In addition, since the dimensional relationship between the groove 27 and the protrusion 28 (the size of the gap between the inner surface of the groove 27 and the outer surface of the protrusion 28) can be maintained properly over a long period of time, When the torque transmission direction by the toroidal-type continuously variable transmission is reversed, it is possible to prevent an unintended shift operation from being performed for a long period of time and to prevent the driver from feeling uncomfortable.
１ 入力回転軸
２ 入力ディスク
３ 出力筒
４ 出力歯車
５ 出力ディスク
６、６ａ パワーローラ
７、７ａ、７ｂ トラニオン
８、８ａ、８ｂ 傾転軸
９ 支持梁部
１０ 支持板
１１、１１ａ ラジアルニードル軸受
１２、１２ａ 支持軸
１３、１３ａ スラスト玉軸受
１４ スラストニードル軸受
１５ 内輪軌道
１６、１６ａ、１６ｂ 外輪
１７、１７ａ 外輪軌道
１８ 玉
１９ 駆動軸
２０ 押圧装置
２１ アクチュエータ
２２、２２ａ 円筒状凸面
２３、２３ａ、２３ｂ 支持梁部
２４、２４ａ 凹部
２５ ラジアルニードル軸受
２６ 段差面
２７、２７ａ 凹溝
２８ 突条
２９ 傾斜凸面部
３０ 平坦面部
３１ 傾斜凹面部
３２ 平坦面部
DESCRIPTION OF SYMBOLS 1 Input rotating shaft 2 Input disk 3 Output cylinder 4 Output gear 5 Output disk 6, 6a Power roller 7, 7a, 7b Trunnion 8, 8a, 8b Tilt shaft 9 Support beam part 10 Support plate 11, 11a Radial needle bearing 12, 12a Support shaft 13, 13a Thrust ball bearing 14 Thrust needle bearing
15 inner ring raceway 16, 16a, 16b outer ring 17 , 17a outer ring raceway 18 ball 19 drive shaft 20 pressing device 21 actuator 22, 22a cylindrical convex surface 23, 23a, 23b support beam portion 24, 24a concave portion 25 radial needle bearing 26 stepped surface 27 27a Groove 28 Projection 29 Inclined convex portion 30 Flat surface portion 31 Inclined concave portion 32 Flat surface portion
