JP4999770B2 - Belt type continuously variable transmission - Google Patents

Belt type continuously variable transmission Download PDF

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JP4999770B2
JP4999770B2 JP2008111768A JP2008111768A JP4999770B2 JP 4999770 B2 JP4999770 B2 JP 4999770B2 JP 2008111768 A JP2008111768 A JP 2008111768A JP 2008111768 A JP2008111768 A JP 2008111768A JP 4999770 B2 JP4999770 B2 JP 4999770B2
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pulley half
movable pulley
pulley
piston
cylinder
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JP2009264427A (en
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徹 矢ケ崎
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Description

本発明は、駆動プーリ及び被動プーリ間に無端状ベルトを巻き掛け、その両プーリの溝幅を変更することで両プーリ間の変速比を無段階に変更可能としたベルト式無段変速機、特に駆動プーリが、回転軸を一体に有する固定プーリ半体と、この固定プーリ半体と協働してベルト溝を形成すると共に回転軸に摺動可能に支持される可動プーリ半体と、前記溝幅を変更するために可動プーリ半体を固定プーリ半体に対し軸方向に進退駆動し得る液圧駆動手段とを備えた無段変速機に関する。   The present invention is a belt-type continuously variable transmission in which an endless belt is wound between a driving pulley and a driven pulley, and the gear ratio between both pulleys can be changed steplessly by changing the groove width of both pulleys, In particular, the driving pulley includes a stationary pulley half integrally having a rotating shaft, a movable pulley half that forms a belt groove in cooperation with the stationary pulley half and is slidably supported on the rotating shaft, The present invention relates to a continuously variable transmission including hydraulic pressure drive means that can move a movable pulley half forward and backward in an axial direction with respect to a fixed pulley half in order to change the groove width.

従来のベルト式無段変速機においては、例えば特許文献1又は2に記載されるように、可動プーリ半体の背面に、その背面の内周端部より固定プーリ半体とは反対方向に延びて回転軸外周に摺動可能に嵌合する円筒状ボス部と、その背面の外周端部より該ボス部と同方向に延びるシリンダ部とを一体に連設する一方、回転軸に、可動プーリ半体側に突出する円筒部を有して可動プーリ半体の背面側を覆うプーリカバーを固定し、前記液圧駆動手段を、可動プーリ半体とプーリカバーとの間に並列に配設した2組の油圧シリンダ機構で構成して、可動プーリ半体に前進推力を作用させる作動油に対する受圧面積拡大を図るようにしたものが既に知られている。   In a conventional belt-type continuously variable transmission, as described in, for example, Patent Document 1 or 2, the rear surface of the movable pulley half extends in the opposite direction from the inner peripheral end of the rear surface of the movable pulley half. A cylindrical boss portion that is slidably fitted to the outer periphery of the rotating shaft and a cylinder portion that extends in the same direction as the boss portion from the outer peripheral end portion of the back surface of the cylindrical boss portion are integrally connected. A pulley cover having a cylindrical portion projecting toward the half body side and covering the back side of the movable pulley half body is fixed, and the hydraulic pressure driving means is disposed in parallel between the movable pulley half body and the pulley cover. There has already been known a structure in which a pressure receiving area for hydraulic oil that is configured by a pair of hydraulic cylinder mechanisms and that applies forward thrust to the movable pulley half is increased.

尚、図6の(A)には特許文献1に記載の無段変速機が、また(B)には、特許文献2に記載の無段変速機がそれぞれ簡略的に示される。
特許第3228174号公報 特開昭60−252857号公報
6A shows the continuously variable transmission described in Patent Document 1 and FIG. 6B shows the continuously variable transmission described in Patent Document 2 in a simplified manner.
Japanese Patent No. 3228174 JP 60-252857 A

図6(A)に示されるものでは、前記2組の油圧シリンダ機構のうち、一方の油圧シリンダ機構A1によって可動プーリ半体背面の径方向中間部に対し推力F1を付与できるようにした上で、他方の油圧シリンダ機構A2によって可動プーリ半体背面の内周端部に対し前記ボス部を介して推力F2を付与し得るようにしており、また、図6(B)に示されるものでは、一方の油圧シリンダ機構A1′によって可動プーリ半体背面の径方向中間部に対し推力F1′を付与できるようにした上で、他方の油圧シリンダ機構A2′によって、可動プーリ半体背面の外周端部に対し前記シリンダ部を介して前進推力F2′を付与し得るようにしている。   In the case shown in FIG. 6A, after one of the two sets of hydraulic cylinder mechanisms, one hydraulic cylinder mechanism A1 can apply a thrust F1 to the radial intermediate portion on the back surface of the movable pulley half. The other hydraulic cylinder mechanism A2 can apply a thrust F2 to the inner peripheral end portion of the back surface of the movable pulley half body via the boss portion, and the one shown in FIG. One hydraulic cylinder mechanism A1 ′ can apply a thrust F1 ′ to the radial intermediate portion of the back surface of the movable pulley half, and the other hydraulic cylinder mechanism A2 ′ can provide an outer peripheral end portion of the back surface of the movable pulley half. In contrast, forward thrust F2 'can be applied through the cylinder portion.

しかしながら図6(A)のものでは、2組の油圧シリンダ機構A1,A2により、可動プーリ半体背面の径方向中間部及び内周端部に対し十分な推力F1,F2を付与できても外周端部に対しては十分な推力を付与し得ないため、特にベルトが可動プーリ半体の外周端近傍位置(例えば図6(A)の実線位置)にある変速状態では、前記推力F1,F2が可動プーリ半体に及ぼす、ベルト・プーリ間の接触点X回りのモーメントM1,M2は、何れも溝幅拡開方向に可動プーリ半体のプーリ面を傾倒させるように作用し、その可動プーリ半体のプーリ面の傾きがベルト・プーリ間の滑りを助長することになって、動力損失を生じさせる虞れがある。   However, in the case of FIG. 6 (A), even if sufficient thrusts F1 and F2 can be applied to the radial intermediate portion and the inner peripheral end portion of the back surface of the movable pulley half by the two sets of hydraulic cylinder mechanisms A1 and A2, the outer periphery Since a sufficient thrust cannot be applied to the end portion, the thrusts F1, F2 are particularly effective in a shift state where the belt is in the vicinity of the outer peripheral end of the movable pulley half (for example, the solid line position in FIG. 6A). The moments M1 and M2 around the contact point X between the belt and the pulley exerted on the movable pulley half act to tilt the pulley surface of the movable pulley half in the groove width expanding direction. The inclination of the pulley surface of the half body promotes the slip between the belt and the pulley, which may cause power loss.

一方、図6(B)のものでは、2組の油圧シリンダ機構A1′,A2′により、可動プーリ半体背面の径方向中間部及び外周端部に対し十分な推力F1′,F2′を付与できても内周端部に対しては十分な推力を付与し得ないため、特にベルトが可動プーリ半体の内周端近傍位置(例えば図6(B)の実線位置)にある変速状態では、上記推力F1′,F2′が可動プーリ半体に及ぼす、ベルト・プーリ間の接触点X回りのモーメントM1′,M2′は、何れも溝幅縮小方向に可動プーリ半体のプーリ面を傾倒させるように作用し、これまた動力損失増大の要因となる虞れがある。   On the other hand, in the case of FIG. 6B, sufficient thrusts F1 ′ and F2 ′ are applied to the radial intermediate portion and the outer peripheral end portion of the back surface of the movable pulley half by the two sets of hydraulic cylinder mechanisms A1 ′ and A2 ′. Even if it is possible, a sufficient thrust cannot be applied to the inner peripheral end portion. Therefore, particularly in a shift state where the belt is in the vicinity of the inner peripheral end of the movable pulley half (for example, the solid line position in FIG. 6B). The moments M1 ′ and M2 ′ around the contact point X between the belt and the pulley exerted by the thrusts F1 ′ and F2 ′ on the movable pulley half tilt the pulley surface of the movable pulley half in the groove width reduction direction. There is a risk that this may cause a power loss increase.

本発明は、斯かる事情に鑑みてなされたもので、可動プーリ半体背面側において、その径方向中間部及び内、外周端部に各々十分な推力を付与し得る3組の油圧シリンダ機構を並列に配置して、可動プーリ半体に作用する推力の分布を径方向内外で極力均一化できるようし、可動プーリ半体の更なる受圧面積拡大を図りながら、推力の偏りによる可動プーリ半体プーリ面の傾きを効果的に防止できるようにして従来構造の問題を解決したベルト式無段変速機を提供することを目的としている。   The present invention has been made in view of such circumstances, and on the back side of the movable pulley half body, there are three sets of hydraulic cylinder mechanisms capable of imparting sufficient thrust to the radial intermediate portion and the inner and outer peripheral end portions, respectively. By arranging in parallel, the distribution of thrust acting on the movable pulley half can be made uniform as much as possible inside and outside in the radial direction, and the movable pulley half due to thrust bias is expanded while further increasing the pressure receiving area of the movable pulley half An object of the present invention is to provide a belt type continuously variable transmission that can effectively prevent the inclination of the pulley surface and solves the problems of the conventional structure.

上記目的を達成するために請求項1の発明は、駆動プーリ及び被動プーリ間に無端状ベルトを巻き掛け、その両プーリの溝幅を変更することで両プーリ間の変速比を無段階に変更可能としたベルト式無段変速機であって、駆動プーリが、回転軸を一体に有する固定プーリ半体と、この固定プーリ半体と協働してベルト溝を形成すると共に回転軸に摺動可能に支持される可動プーリ半体と、前記溝幅を変更するために可動プーリ半体を固定プーリ半体に対し軸方向に進退駆動し得る液圧駆動手段とを備えたものにおいて、前記可動プーリ半体の背面には、その背面の内周端部より固定プーリ半体とは反対方向に延びて回転軸外周に摺動可能に嵌合する円筒状ボス部と、その背面の外周端部より該ボス部と同方向に延びるシリンダ部とが一体に連設され、前記回転軸には、可動プーリ半体の背面側を覆うプーリカバーが固定されていて、そのプーリカバーに、前記シリンダ部よりも大径の外筒部と、前記シリンダ部よりも小径で且つ前記ボス部よりも大径の内筒部とが可動プーリ半体側に各々突設され、前記液圧駆動手段は、前記シリンダ部及び前記ボス部間に摺動可能に嵌合されると共に前記内筒部の先端に背面が係合する第1ピストンと、この第1ピストンの前面と前記可動プーリ半体背面との間に画成される第1油室と、前記内筒部に外周部が摺動可能に嵌合されると共に前記ボス部に内周部が連結される第2ピストンと、この第2ピストンの背面と前記プーリカバーとの間に画成される第2油室と、前記内、外筒部間に摺動可能に嵌合されると共に前記シリンダ部の先端に前面が係合する第3ピストンと、この第3ピストンの背面と前記プーリカバーとの間に画成される第3油室とを備え、前記各油室に作動油を供給することで前記可動プーリ半体に前記固定プーリ半体側への推力を生じさせるようにしたことを特徴とする。   In order to achieve the above object, the invention according to claim 1 is characterized in that an endless belt is wound between a driving pulley and a driven pulley, and the gear ratio between both pulleys is changed steplessly by changing the groove width of both pulleys. A belt-type continuously variable transmission that can be driven, in which a driving pulley forms a belt groove in cooperation with the stationary pulley half that integrally has a rotating shaft, and slides on the rotating shaft. A movable pulley half that is supported, and hydraulic drive means that can move the movable pulley half forward and backward in the axial direction with respect to the fixed pulley half in order to change the groove width. On the back of the pulley half, a cylindrical boss extending from the inner peripheral end of the back in the opposite direction to the fixed pulley half and slidably fitting on the outer periphery of the rotating shaft, and the outer peripheral end of the rear Further, the boss portion and the cylinder portion extending in the same direction are integrally connected. A pulley cover that covers the back side of the movable pulley half is fixed to the rotating shaft, and an outer cylinder portion that is larger in diameter than the cylinder portion and a smaller diameter than the cylinder portion are attached to the pulley cover. And the inner cylinder part larger in diameter than the boss part protrudes from the movable pulley half, and the hydraulic pressure drive means is slidably fitted between the cylinder part and the boss part, and A first piston whose rear surface engages with a tip of the inner cylinder portion, a first oil chamber defined between the front surface of the first piston and the rear surface of the movable pulley half, and an outer peripheral portion on the inner cylinder portion Is slidably fitted, and a second piston whose inner peripheral portion is connected to the boss portion, a second oil chamber defined between the back surface of the second piston and the pulley cover, It is slidably fitted between the inner and outer cylinders, and the front of the cylinder part And a third oil chamber defined between a back surface of the third piston and the pulley cover, and the movable pulley half is provided by supplying hydraulic oil to each oil chamber. The body is caused to generate a thrust toward the fixed pulley half.

また請求項2の発明は、駆動プーリ及び被動プーリ間に無端状ベルトを巻き掛け、その両プーリの溝幅を変更することで両プーリ間の変速比を無段階に変更可能としたベルト式無段変速機であって、駆動プーリが、回転軸を一体に有する固定プーリ半体と、この固定プーリ半体と協働してベルト溝を形成すると共に回転軸に摺動可能に支持される可動プーリ半体と、前記溝幅を変更するために可動プーリ半体を固定プーリ半体に対し軸方向に進退駆動し得る液圧駆動手段とを備えたものにおいて、前記可動プーリ半体の背面には、その背面の内周端部より固定プーリ半体とは反対方向に延びて回転軸外周に摺動可能に嵌合する円筒状ボス部と、その背面の外周端部より該ボス部と同方向に延びるシリンダ部とが一体に連設され、前記回転軸には、可動プーリ半体の背面側を覆うプーリカバーが固定されていて、そのプーリカバーに、前記シリンダ部よりも大径の外筒部と、前記ボス部の先端部に内周部が摺動可能に嵌合する内筒部とがそれぞれ可動プーリ半体側に突設され、前記液圧駆動手段は、前記シリンダ部及び前記ボス部間に摺動可能に嵌合されると共に前記内筒部の先端に背面が係合する第1ピストンと、この第1ピストンの前面と前記可動プーリ半体背面との間に画成される第1油室と、前記ボス部の、前記内筒部内に突入した先端部により構成される第2ピストンと、この第2ピストンの背面と前記プーリカバーとの間に画成される第2油室と、前記内、外筒部間に摺動可能に嵌合されると共に前記シリンダ部の先端に前面が係合する第3ピストンと、この第3ピストンの背面と前記プーリカバーとの間に画成される第3油室とを備え、前記各油室に作動油を供給することで前記可動プーリ半体に前記固定プーリ半体側への推力を生じさせるようにしたことを特徴とする。   Further, the invention of claim 2 is a belt type non-rotating belt in which an endless belt is wound between a driving pulley and a driven pulley, and the gear ratio between both pulleys can be changed steplessly by changing the groove width of both pulleys. A stepped transmission, wherein a drive pulley is a movable pulley half integrally formed with a rotating shaft, and a belt groove is formed in cooperation with the stationary pulley half and is slidably supported on the rotating shaft. A pulley half and hydraulic drive means capable of driving the movable pulley half forward and backward in the axial direction with respect to the fixed pulley half in order to change the groove width; The cylindrical boss extends from the inner peripheral end of the back surface in the opposite direction to the fixed pulley half and is slidably fitted to the outer periphery of the rotating shaft, and the boss is the same as the boss portion from the outer peripheral end of the rear surface. And a cylinder portion extending in the direction are integrally connected to the rotating shaft. A pulley cover that covers the back side of the movable pulley half is fixed, and the outer peripheral portion of the pulley cover that is larger in diameter than the cylinder portion and the inner peripheral portion can slide on the tip of the boss portion And the hydraulic pressure drive means is slidably fitted between the cylinder part and the boss part and at the tip of the inner cylinder part. And a first oil chamber defined between a front surface of the first piston and the rear surface of the movable pulley half, and a boss portion that has entered the inner cylinder portion. A second piston constituted by a tip portion, a second oil chamber defined between a back surface of the second piston and the pulley cover, and a slidably fitted between the inner and outer cylinder portions. And a third piston whose front surface engages with the tip of the cylinder portion, and the third piston And a third oil chamber defined between the rear surface of the pulley and the pulley cover, and by supplying hydraulic oil to each of the oil chambers, a thrust toward the fixed pulley half is generated in the movable pulley half It was made to let it be made to do.

以上のように請求項1,2の各発明によれば、駆動プーリの可動プーリ半体背面側において、その径方向中間部及び内、外周端部に各々十分な推力を付与し得る3組の油圧シリンダ機構を並列に配置して、可動プーリ半体に作用する推力の分布を径方向内外で極力均一化できるようにしたので、その推力が可動プーリ半体に及ぼす、ベルト・プーリ間の接触点回りのモーメントが一方向に偏るのを、その接触点の径方向位置(即ち変速比)の如何によらず回避することができて、そのモーメントの偏りに因る可動プーリ半体のプーリ面の傾きを効果的に防止できる。これにより、可動プーリ半体の更なる受圧面積拡大を図りながら、可動プーリ半体の傾きに起因した動力損失増大等の問題を効果的に抑えることができる。またプーリカバーに突設されて第2,第3油室間の隔壁となる内筒部が、可動プーリ半体内、外周端部に推力を各々付与する2つの油圧シリンダ機構のシリンダ壁に共用されるため、それだけ構造が簡素化され、装置の小型化及びコスト節減に寄与することができる。しかもプーリカバーにおける上記内筒部の径方向配設位置を変更するだけで、第2,第3ピストンの受圧面積比、延いては可動プーリ半体の内、外周端部に対する推力分担比率を容易に変更可能である。   As described above, according to the first and second aspects of the present invention, on the back side of the movable pulley half of the drive pulley, three sets each capable of imparting sufficient thrust to the radial intermediate portion and the inner and outer peripheral end portions. Since the hydraulic cylinder mechanism is arranged in parallel so that the distribution of thrust acting on the movable pulley half can be made as uniform as possible in the radial direction, the contact between the belt and pulley that the thrust exerts on the movable pulley half It is possible to avoid the moment around the point being biased in one direction regardless of the radial position (that is, the gear ratio) of the contact point, and the pulley surface of the movable pulley half caused by the bias in the moment Can be effectively prevented. Thereby, problems such as an increase in power loss due to the inclination of the movable pulley half can be effectively suppressed while further increasing the pressure receiving area of the movable pulley half. Also, the inner cylinder portion protruding from the pulley cover and serving as a partition between the second and third oil chambers is shared by the cylinder walls of the two hydraulic cylinder mechanisms that respectively apply thrust to the movable pulley half and the outer peripheral end. Therefore, the structure is simplified accordingly, which can contribute to downsizing of the apparatus and cost reduction. Moreover, by simply changing the radial arrangement position of the inner cylinder part in the pulley cover, the pressure receiving area ratio of the second and third pistons, and thus the thrust sharing ratio with respect to the outer peripheral end of the movable pulley half can be easily achieved. Can be changed.

また特に請求項2の発明によれば、第3油圧シリンダ機構のピストンの受圧面積、従って可動プーリ半体外周端部に及ぼす前進推力を、可動プーリ半体及びプーリカバーの限られたサイズの中で最大限大きく設定可能となるため、可動プーリ半体プーリ面の溝幅拡開方向への傾きを効果的に防止でき、その傾きに因るプーリ・ベルト間の滑りを効果的に抑えて、その間での動力損失を効果的に軽減することができる。しかも、可動プーリ半体の背面の内周端部より固定プーリ半体とは反対方向に延びて回転軸外周に摺動可能に嵌合する円筒状ボス部が、可動プーリ半体の内周端部に推力を付与する油圧シリンダ機構のピストン(即ち第2ピストン)に兼用できるため、更なる構造の簡素化が図られ、装置の小型化及びコスト節減に一層寄与することができる。   In particular, according to the second aspect of the present invention, the pressure receiving area of the piston of the third hydraulic cylinder mechanism, and hence the forward thrust exerted on the outer peripheral end of the movable pulley half can be reduced within a limited size of the movable pulley half and the pulley cover. Since it can be set to the maximum at the maximum, the inclination of the movable pulley half pulley surface in the groove width expansion direction can be effectively prevented, and the slip between the pulley and the belt due to the inclination can be effectively suppressed, The power loss during that time can be effectively reduced. Moreover, the cylindrical boss that extends in the opposite direction to the fixed pulley half from the inner peripheral end of the back surface of the movable pulley half and is slidably fitted to the outer periphery of the rotating shaft is the inner peripheral end of the movable pulley half. Since it can also be used as a piston (that is, the second piston) of the hydraulic cylinder mechanism that applies thrust to the part, the structure can be further simplified, and the device can be further reduced in size and cost.

本発明の実施の形態を、添付図面に例示した本発明の実施例に基づいて以下に具体的に説明する。   Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

添付図面において、
図1〜図3は、本発明の第1実施例を示すもので、図1は、金属ベルト式無段変速機を搭載した車両の動力伝達系のスケルトン図、図2は駆動プーリの全体縦断面図、図3は図2の3−3線拡大断面図である。また図4は、本発明の第2実施例に係る駆動プーリの、図2と同様の全体縦断面図、図5は、本発明の第3実施例に係る駆動プーリの、図2と同様の全体縦断面図である。
In the accompanying drawings,
1 to 3 show a first embodiment of the present invention. FIG. 1 is a skeleton diagram of a power transmission system of a vehicle equipped with a metal belt type continuously variable transmission, and FIG. 2 is an overall longitudinal view of a drive pulley. FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 4 is an overall longitudinal sectional view similar to FIG. 2 of the drive pulley according to the second embodiment of the present invention, and FIG. 5 is similar to FIG. 2 of the drive pulley according to the third embodiment of the present invention. It is a whole longitudinal cross-sectional view.

先ず、図1において、車両に搭載されるエンジンEの動力は、ダンパーD、駆動軸Si、前後進切換機構4、金属ベルト式無段変速機T、被動軸So、発進用クラッチ5、歯車伝動機構6、差動機構7を順次経由して左右の駆動輪W,Wに伝達される。   First, in FIG. 1, the power of an engine E mounted on a vehicle includes a damper D, a drive shaft Si, a forward / reverse switching mechanism 4, a metal belt type continuously variable transmission T, a driven shaft So, a starting clutch 5, a gear transmission. It is transmitted to the left and right drive wheels W, W via the mechanism 6 and the differential mechanism 7 in order.

前記無段変速機Tは、互いに平行に配置された駆動軸Siおよび被動軸So間に介装されて、その両軸Si,So間の変速比を無段階に変更するものであって、駆動軸Si上に支持された駆動プーリPと、被動軸Soに設けられた被動プーリP′と、その両プーリP,P′間に巻き掛けられた無端状の金属ベルトBとを備える。そして、その両プーリP,P′の溝幅tを変化させることで両プーリP,P′間、従って駆動軸Si及び被動軸So間の変速比を無段階に変更可能である。   The continuously variable transmission T is interposed between a drive shaft Si and a driven shaft So arranged in parallel to each other, and continuously changes a gear ratio between the shafts Si and So. A driving pulley P supported on the shaft Si, a driven pulley P ′ provided on the driven shaft So, and an endless metal belt B wound between the pulleys P and P ′ are provided. By changing the groove width t of the pulleys P and P ′, the gear ratio between the pulleys P and P ′, and hence between the drive shaft Si and the driven shaft So can be changed steplessly.

各プーリP,P′へは、電子制御ユニットECUで作動制御された油圧制御ユニットUから、エンジンEの運転状態に応じて作動油が給,排制御されて、前記変速比の無段階制御がなされる。   Each of the pulleys P and P ′ is supplied and discharged with hydraulic oil according to the operating state of the engine E from the hydraulic control unit U that is controlled by the electronic control unit ECU, so that the gear ratio is continuously controlled. Made.

また、前記金属ベルトBは、左右2本の金属リング集合体8,8に多数の金属エレメント9…を装着して構成されるものであり、その構造は、従来周知であるので、具体的な説明は省略する。   The metal belt B is constructed by attaching a large number of metal elements 9 to the two left and right metal ring assemblies 8, 8 and the structure thereof is well known in the art. Description is omitted.

エンジンEのクランクシャフトEcの端部はダンパーDを介して駆動軸Siの一端に接続されており、その駆動軸Siの中間部上には、無段変速機Tの駆動プーリ1が回転自在に嵌合、支持される。さらにその駆動軸Siの他端部には、遊星歯車機構よりなる前後進切換機構4の入力側が連結され、この前後進切換機構4の出力側は、駆動プーリPの固定プーリ半体1に連結される。   The end of the crankshaft Ec of the engine E is connected to one end of the drive shaft Si via a damper D, and the drive pulley 1 of the continuously variable transmission T is rotatable on the intermediate portion of the drive shaft Si. Mated and supported. Further, the other end of the drive shaft Si is connected to the input side of a forward / reverse switching mechanism 4 comprising a planetary gear mechanism, and the output side of the forward / backward switching mechanism 4 is connected to the fixed pulley half 1 of the drive pulley P. Is done.

また被動軸Soの一端部には発進用クラッチ5の入力側が連結されており、このクラッチ5の出力側には、歯車伝動機構6および差動機構7を介して左右の駆動輪W,Wが連結される。   An input side of the starting clutch 5 is connected to one end of the driven shaft So, and left and right drive wheels W, W are connected to the output side of the clutch 5 via a gear transmission mechanism 6 and a differential mechanism 7. Connected.

駆動プーリPは、駆動軸Siに相対回転自在に嵌合、支持される回転軸1kを一体に有する固定プーリ半体1と、この固定プーリ半体1と協働してベルト溝Gを形成すべく該固定プーリ半体1(即ち回転軸1k)に軸方向摺動自在に嵌合、支持される可動プーリ半体2と、前記ベルト溝Gの溝幅を変更するために可動プーリ半体2を固定プーリ半体1に対し軸方向に進退駆動し得る液圧駆動手段Aとを備えている。   The drive pulley P forms a belt groove G in cooperation with the fixed pulley half 1 integrally having a rotary shaft 1k that is fitted and supported so as to be relatively rotatable with the drive shaft Si. Therefore, the movable pulley half 2 is fitted and supported so as to be slidable in the axial direction to the fixed pulley half 1 (that is, the rotary shaft 1k), and the movable pulley half 2 to change the groove width of the belt groove G. Is provided with hydraulic pressure drive means A that can be driven forward and backward in the axial direction with respect to the stationary pulley half 1.

而して、この液圧駆動手段Aの構造に本発明の特徴があり、その構造の一例を、図2,図3も併せて参照して、次に具体的に説明する。   Thus, the structure of the hydraulic pressure driving means A has the feature of the present invention, and an example of the structure will be specifically described below with reference to FIGS.

可動プーリ半体2の背面には、その背面の内周端部より固定プーリ半体1とは反対方向に延びて回転軸1k外周に軸受10を介して相対回転可能且つ軸方向摺動可能に嵌合、支持される円筒状のボス部2bと、その背面の外周端部より該ボス部2bと同心状で且つ同方向に延びる円筒状のシリンダ部2cとが一体に連設される。   On the back surface of the movable pulley half 2, it extends in the direction opposite to the fixed pulley half 1 from the inner peripheral end of the back surface, and can rotate relative to the outer periphery of the rotary shaft 1 k via the bearing 10 and can slide in the axial direction. A cylindrical boss portion 2b to be fitted and supported and a cylindrical cylinder portion 2c that is concentric with and extends in the same direction as the boss portion 2b from the outer peripheral end portion of the back surface thereof are integrally provided.

また前記回転軸1kには、可動プーリ半体2の背面側を覆う皿状のプーリカバーCの内周端部が液密に固定されており、そのプーリカバーCの前面、即ち可動プーリ半体2との対向面には、前記シリンダ部2cよりも大径の外筒部Coと、前記シリンダ部2cよりも小径で且つ前記ボス部2bよりも大径の内筒部Ciとが、可動プーリ半体2側に各々延びるように互いに同心状に一体に突設される。   An inner peripheral end of a dish-shaped pulley cover C that covers the back side of the movable pulley half 2 is fixed to the rotary shaft 1k in a liquid-tight manner. The front surface of the pulley cover C, that is, the movable pulley half is fixed. 2 is an outer cylinder portion Co having a diameter larger than that of the cylinder portion 2c, and an inner cylinder portion Ci having a diameter smaller than that of the cylinder portion 2c and larger than that of the boss portion 2b. Projecting integrally and concentrically with each other so as to extend to the half body 2 side.

前記液圧駆動手段Aは、可動プーリ半体2の背面側に互いに並列に配置される第1〜第3油圧シリンダA1〜A3より構成される。それら第1〜第3油圧シリンダA1〜A3の各油室c1 ,c2 ,c3 に作動油を供給することで、可動プーリ半体2に固定プーリ半体1側への推力、即ち前進推力を生じさせるようにしている。 The hydraulic pressure driving means A includes first to third hydraulic cylinders A1 to A3 arranged in parallel with each other on the back side of the movable pulley half 2. By supplying hydraulic oil to the oil chambers c 1 , c 2 , c 3 of the first to third hydraulic cylinders A 1 to A 3, thrust to the movable pulley half 2 toward the fixed pulley half 1 side, that is, forward movement The thrust is generated.

第1油圧シリンダ機構A1は、可動プーリ半体2の背面の径方向中間部に前進推力F1を付与するためのものであって、可動プーリ半体2のシリンダ部2c及びボス部2b間に摺動可能に嵌合され且つプーリカバーCの内筒部Ciの先端に背面が係合する第1ピストンp1 と、この第1ピストンp1 の前面と可動プーリ半体2の背面との間に画成される第1油室c1 とを備える。前記第1ピストンp1 は、リング板状に形成され、その内周面及び外周面には、該ピストンp1 の内、外周摺動部をシールするための環状シール部材がそれぞれ装着される。 The first hydraulic cylinder mechanism A1 is for applying a forward thrust F1 to the radially intermediate portion of the back surface of the movable pulley half 2, and is slid between the cylinder portion 2c and the boss portion 2b of the movable pulley half 2. a first piston p 1 which rotatably mated and back to the tip of the inner cylindrical portion Ci of the pulley cover C is engaged, between the first front and back of the movable pulley half second piston p 1 A first oil chamber c 1 defined. The first piston p 1 is formed in a ring plate shape, and annular seal members for sealing the outer peripheral sliding portion of the piston p 1 are mounted on the inner peripheral surface and the outer peripheral surface, respectively.

而してプーリカバーCの内筒部Ciは、その先端部に第1ピストンp1 の背面が係合することで該第1ピストンp1 の後退限を規制するストッパ手段として機能する。従って、第1油室c1 に作動油が導入されると、可動プーリ半体2の背面に作動油圧が作用して、その背面の径方向中間部に対し前進推力F1を付与することができる。 The inner cylindrical portion Ci of Thus to the pulley cover C functions as a stopper means for a first rear piston p 1 regulates the first retreat limit of the piston p 1 by engaging at its distal end. Therefore, when the hydraulic oil is introduced into the first oil chamber c 1, and acts working oil pressure to the back of the movable pulley half 2 can be provided with forward thrust F1 to the radial direction intermediate portion of the back .

また第2油圧シリンダ機構A2は、可動プーリ半体2の背面の内周端部に前記ボス部2bを介して前進推力F2を付与するためのものであって、プーリカバーCの内筒部Ciに外周部が環状シール部材を介して摺動可能に嵌合され且つ可動プーリ半体2のボス部2bの外周段部に内周部が液密に嵌合される第2ピストンp2 と、この第2ピストンp2 の背面とプーリカバーCの前面との間に画成される第2油室c2 とを備えており、第2ピストンp2 は、ボス部2bに適宜固定手段(図示例ではボス部2bの端部外周に弾性係止させたサークリップ16)で固定される。 The second hydraulic cylinder mechanism A2 is for applying a forward thrust F2 to the inner peripheral end of the back surface of the movable pulley half 2 via the boss 2b, and the inner cylinder Ci of the pulley cover C. A second piston p 2 whose outer peripheral portion is slidably fitted via an annular seal member and whose inner peripheral portion is fluid-tightly fitted to the outer peripheral step portion of the boss portion 2b of the movable pulley half 2 . A second oil chamber c 2 defined between the rear surface of the second piston p 2 and the front surface of the pulley cover C is provided, and the second piston p 2 is appropriately fixed to the boss portion 2b (see FIG. In the example shown, it is fixed with a circlip 16) elastically locked to the outer periphery of the end of the boss 2b.

而して第2油室c2 に作動油が導入されると、第2ピストンp2 の背面に作動油圧が作用して、該第2ピストンp2 、従って、それと一体のボス部2bを介して可動プーリ半体2の内周端部に対し前進推力F2を付与することができる。 When Thus to hydraulic oil to the second oil chamber c 2 it is introduced, and acts working oil pressure to the back of the second piston p 2, the second piston p 2, therefore, the same through the boss portion 2b integral Thus, the forward thrust F <b> 2 can be applied to the inner peripheral end of the movable pulley half 2.

また第3油圧シリンダ機構A3は、可動プーリ半体2の背面の外周端部に前記シリンダ部2cを介して前進推力F3を付与するためのものであって、プーリカバーCの内、外筒部Ci,Co間に摺動可能に嵌合され且つ可動プーリ半体2のシリンダ部2cの先端に前面が係合する第3ピストンp3 と、この第3ピストンp3 の背面とプーリカバーCの前面との間に画成される第3油室c3 とを備える。 The third hydraulic cylinder mechanism A3 is for applying a forward thrust F3 to the outer peripheral end of the back surface of the movable pulley half 2 via the cylinder part 2c. A third piston p 3 that is slidably fitted between Ci and Co and that has a front surface engaged with the tip of the cylinder portion 2 c of the movable pulley half 2, a back surface of the third piston p 3 , and a pulley cover C And a third oil chamber c 3 defined between the front surface and the front surface.

而して第3油室c3 に作動油が導入されると、第3ピストンp3 の背面に作動油圧が作用して、該第3ピストンp3 、従って、それの前面と係合するシリンダ部2cを介して可動プーリ半体2の外周端部に対し前進推力F3を付与することができる。 When the hydraulic oil in the third oil chamber c 3 by Thus is introduced, cylinder acts working oil pressure to the back of the third piston p 3, third piston p 3, therefore, to engage it on the front and The forward thrust F3 can be applied to the outer peripheral end of the movable pulley half 2 via the portion 2c.

前記回転軸1kは中空に形成されており、その中空部は、油圧制御ユニットUに連通していて、該ユニットUからの作動油が導入される給油路12として機能する。またその回転軸1kの周壁には、給油路12に連通する複数の第1連絡油路13が放射状に形成され、さらにその回転軸1kの外周面と可動プーリ半体2のボス部2b内周面との嵌合面間には、軸方向に延び且つ外端が第2油室c2 に直接開口する複数の第2連絡油路14が周方向に互いに間隔をおいて形成される。 The rotary shaft 1k is formed in a hollow shape, and the hollow portion communicates with the hydraulic control unit U and functions as an oil supply passage 12 into which hydraulic oil from the unit U is introduced. A plurality of first communication oil passages 13 communicating with the oil supply passage 12 are formed radially on the peripheral wall of the rotary shaft 1k, and further, the outer peripheral surface of the rotary shaft 1k and the inner periphery of the boss portion 2b of the movable pulley half 2 A plurality of second communication oil passages 14 extending in the axial direction and having an outer end directly opening into the second oil chamber c 2 are formed between the fitting surfaces with the surfaces in the circumferential direction at intervals.

そして、可動プーリ半体2のボス部2bには、第2連絡油路14を第1油室c1 に連通させる横孔15が設けられ、またプーリカバーCの内筒部Ciには、第2,第3油室c2 ,c3 間を連通させる横孔17が設けられる。従って、油圧制御ユニットUから給油路12に導入された作動油は、第1,第2連絡油路13,14及び横孔15を介して第1油室c1 に導入され、またそれと略同時に第1,第2連絡油路13,14を介して第2油室c2 に導入され、更に第2油室c2 から横穴17を介して第3油室c3 にも略同時に導入される。 And, the boss portion 2b of the movable pulley half 2, the second communication oil passage 14 transverse bore 15 which communicates is provided in the first oil chamber c 1, also to the inner cylindrical portion Ci of the pulley cover C is the 2, a lateral hole 17 is provided for communicating between the third oil chambers c 2 and c 3 . Accordingly, the hydraulic oil introduced from the hydraulic control unit U into the oil supply passage 12 is introduced into the first oil chamber c 1 through the first and second communication oil passages 13 and 14 and the lateral hole 15, and almost simultaneously therewith. The oil is introduced into the second oil chamber c 2 through the first and second communication oil passages 13 and 14, and further introduced into the third oil chamber c 3 from the second oil chamber c 2 through the lateral hole 17 almost simultaneously. .

一方、被動プーリP′は、被動軸Soに一体に形成された固定プーリ半体1′と、この固定プーリ半体1′に対して軸方向摺動自在な可動プーリ半体2′と、その両プーリ半体1′,2′間に形成されたベルト溝Gの溝幅を変更するために可動プーリ半体2′を固定プーリ半体1′に対し軸方向に進退駆動し得る、只1組の油圧シリンダ機構からなる液圧駆動手段A′とを備える。   On the other hand, the driven pulley P 'includes a fixed pulley half 1' formed integrally with the driven shaft So, a movable pulley half 2 'slidable in the axial direction with respect to the fixed pulley half 1', and In order to change the width of the belt groove G formed between the two pulley halves 1 'and 2', the movable pulley half 2 'can be driven back and forth in the axial direction with respect to the fixed pulley half 1'. And hydraulic drive means A ′ comprising a set of hydraulic cylinder mechanisms.

かくして、乗員が運転席のセレクトレバーでフォワードレンジを選択すると、電子制御ユニットECUにより作動する油圧制御ユニットUからの指令により、先ず、前後進切換装置4が前進切換位置に切り替わり、その結果、駆動軸Siが駆動プーリPに一体に結合される。続いて発進用クラッチ5が係合し、エンジンEのトルクが駆動軸Si、前後進切換装置4、駆動プーリP、金属ベルトB、被動プーリP′、被動軸So、発進クラッチ5及び差動機構7を経て駆動輪W,Wに伝達され、車両は前進発進する。セレクトレバーでリバースレンジを選択すると、油圧制御ユニットUからの指令により、前後進切換装置4が後退切換位置に切り替わり、その結果、駆動プーリPが駆動軸Siの回転方向と逆方向に駆動されるため、発進用クラッチ5の係合により車両は後進発進する。   Thus, when the occupant selects the forward range with the select lever in the driver's seat, the forward / reverse switching device 4 is first switched to the forward switching position in response to a command from the hydraulic control unit U operated by the electronic control unit ECU. The shaft Si is integrally coupled to the drive pulley P. Subsequently, the starting clutch 5 is engaged, and the torque of the engine E causes the driving shaft Si, the forward / reverse switching device 4, the driving pulley P, the metal belt B, the driven pulley P ', the driven shaft So, the starting clutch 5 and the differential mechanism. 7 is transmitted to the drive wheels W, W, and the vehicle starts moving forward. When the reverse range is selected by the select lever, the forward / reverse switching device 4 is switched to the reverse switching position by a command from the hydraulic control unit U, and as a result, the drive pulley P is driven in the direction opposite to the rotation direction of the drive shaft Si. Therefore, the vehicle starts moving backward by the engagement of the starting clutch 5.

このようにして車両が発進すると、油圧制御ユニットUからの指令で駆動プーリPの液圧駆動手段A(第1〜第3油圧シリンダ機構A1〜A3)の各油室c1 〜c3 に供給される油圧が増加し、駆動プーリPの可動プーリ半体2が固定プーリ半体1に接近して有効半径が増加するとともに、被動プーリP′の液圧駆動手段A′の油室に供給される油圧が減少し、被動プーリP′の可動プーリ半体2′が固定プーリ半体1′から離反して有効半径が減少することにより、無段変速機TのレシオがLOW側からOD側に向けて連続的に変化する。 When the vehicle starts in this way, it is supplied to the oil chambers c 1 to c 3 of the hydraulic pressure driving means A (first to third hydraulic cylinder mechanisms A1 to A3) of the driving pulley P by a command from the hydraulic control unit U. As the hydraulic pressure increases, the movable pulley half 2 of the drive pulley P approaches the fixed pulley half 1 and the effective radius increases and is supplied to the oil chamber of the hydraulic drive means A ′ of the driven pulley P ′. As the hydraulic pressure decreases, the movable pulley half 2 'of the driven pulley P' moves away from the fixed pulley half 1 'and the effective radius decreases, so that the ratio of the continuously variable transmission T changes from LOW to OD. It changes continuously.

ところで駆動プーリPの液圧駆動手段Aを構成する3組の油圧シリンダ機構A1〜A3のうち、第1油圧シリンダ機構A1は、可動プーリ半体2の背面の径方向中間部に前進推力F1を付与し、また第2油圧シリンダ機構A2は、可動プーリ半体2の背面の内周端部に前記ボス部2bを介して前進推力F2を付与し、さらに第3油圧シリンダ機構A3は、可動プーリ半体2の背面の外周端部に前記シリンダ部2cを介して前進推力F3を付与することができる。   By the way, of the three sets of hydraulic cylinder mechanisms A1 to A3 constituting the hydraulic pressure driving means A of the drive pulley P, the first hydraulic cylinder mechanism A1 applies the forward thrust F1 to the radial intermediate portion on the back surface of the movable pulley half 2. The second hydraulic cylinder mechanism A2 applies forward thrust F2 to the inner peripheral end of the back surface of the movable pulley half 2 via the boss 2b, and the third hydraulic cylinder mechanism A3 further includes a movable pulley. A forward thrust F3 can be applied to the outer peripheral end of the back surface of the half body 2 through the cylinder portion 2c.

そして、前記推力F1,F2,F3は、可動プーリ半体2に対し、ベルト・プーリ間の接触点X回りのモーメントM1,M2,M3を各々及ぼすようになるが、例えば図2に示すようにベルトBが可動プーリ半体の外周端寄り位置にある変速状態では、前記接触点Xを挟んで径方向内方側に図2で時計回りのモーメントM1,M2が、またその径方向外側に図2で反時計回りのモーメントM3がそれぞれ作用するようになり、従って、その可動プーリ半体2に作用するモーメントM1〜M3の作用方向の偏りが回避されるため、そのプーリ面が溝幅拡開方向に過度に傾くのを防止して、その傾きによる動力損失増大を防止することができる。一方、ベルトBが可動プーリ半体の内周端寄り位置(例えば図6の(B)のベルト位置を参照)にある変速状態では、前記接触点Xを挟んで径方向内方側に図2で時計回りのモーメントM2が、またその径方向外側に図2で反時計回りのモーメントM1,M3がそれぞれ作用するようになり、従って、その可動プーリ半体2のプーリ面が溝幅縮小方向に過度に傾くのを防止して、その傾きによる動力損失増大を防止することができる。   The thrusts F1, F2, and F3 exert moments M1, M2, and M3 around the contact point X between the belt and the pulley on the movable pulley half 2, respectively. For example, as shown in FIG. In the speed change state where the belt B is located near the outer peripheral end of the movable pulley half, the moments M1 and M2 clockwise in FIG. 2 on the inner side in the radial direction across the contact point X and the outer side in the radial direction in FIG. 2, the counterclockwise moment M3 is applied to the movable pulley half 2. Therefore, the bias of the acting direction of the moments M1 to M3 acting on the movable pulley half 2 is avoided. An excessive tilt in the direction can be prevented, and an increase in power loss due to the tilt can be prevented. On the other hand, in a speed change state where the belt B is at a position near the inner peripheral end of the movable pulley half (see, for example, the belt position in FIG. 6B), the belt B is located radially inward with the contact point X in between. 2 and the counterclockwise moments M1 and M3 in FIG. 2 act on the outer side in the radial direction, respectively. Therefore, the pulley surface of the movable pulley half 2 moves in the direction of reducing the groove width. An excessive tilt can be prevented, and an increase in power loss due to the tilt can be prevented.

かくして、本実施例では、可動プーリ半体2の背面側において、その径方向中間部及び内、外周端部に各々十分な推力F1,F2,F3を付与し得る3組の油圧シリンダ機構A1,A2,A3を並列に配置して、可動プーリ半体2に作用する推力の分布を径方向内外で極力均一化できるようにしている。従って、それら推力F1〜F3が可動プーリ半体2に及ぼす、ベルト・プーリ間の接触点X回りのモーメントM1〜M3が一方向に偏るのを、その接触点Xの径方向位置(即ち変速比)の如何によらず可及的に回避することができるから、そのモーメントの作用方向の偏りに因る可動プーリ半体2のプーリ面の傾きを効果的に防止できる。これにより、可動プーリ半体2の更なる受圧面積拡大を図りながら、可動プーリ半体2のプーリ面の傾きに因る動力損失増大を効果的に抑制できる。   Thus, in this embodiment, on the back side of the movable pulley half 2, the three sets of hydraulic cylinder mechanisms A1, A1 that can apply sufficient thrusts F1, F2, F3 to the radially intermediate portion, the inner portion, and the outer peripheral end portion, respectively. A2 and A3 are arranged in parallel so that the distribution of thrust acting on the movable pulley half 2 can be made as uniform as possible inside and outside in the radial direction. Therefore, the moments M1 to M3 around the contact point X between the belt and the pulley exerted on the movable pulley half 2 by the thrusts F1 to F3 are biased in one direction. Therefore, the inclination of the pulley surface of the movable pulley half 2 due to the bias in the acting direction of the moment can be effectively prevented. As a result, an increase in power loss due to the inclination of the pulley surface of the movable pulley half 2 can be effectively suppressed while further increasing the pressure receiving area of the movable pulley half 2.

そして、このようにプーリPのV面角度及びプーリ剛性に応じて、可動プーリ半体2のベルトB(エレメント9)に対する傾きを効果的に抑えることができるため、V面角度を狭角化にしたプーリに対しても同様に、可動プーリ半体のベルト(エレメント)に対する傾きによるエレメント・プーリ間の滑りを防止することになり、動力損失低減に有効である。   And since the inclination with respect to the belt B (element 9) of the movable pulley half body 2 can be effectively suppressed according to the V surface angle and pulley rigidity of the pulley P in this way, the V surface angle is narrowed. Similarly, the slippage between the element and the pulley due to the inclination of the movable pulley half with respect to the belt (element) is prevented, and this is effective in reducing the power loss.

その上、本実施例では、プーリカバーCに突設されて第2,第3油室c2 ,c3 間の隔壁となる内筒部Ciが、可動プーリ半体2の内、外周端部に推力F2,F3を各々付与する2つの油圧シリンダ機構A2,A3のシリンダ壁に共用されるから、それだけ構造が簡素化され、装置の小型化及びコスト節減が達成される。 In addition, in this embodiment, the inner cylinder portion Ci that protrudes from the pulley cover C and serves as a partition wall between the second and third oil chambers c 2 and c 3 is provided on the outer peripheral end portion of the movable pulley half 2. Since the two hydraulic cylinder mechanisms A2 and A3, which respectively apply thrusts F2 and F3, are shared by the cylinder walls, the structure is simplified and the apparatus can be reduced in size and cost can be reduced.

ところで、プーリカバーCに突設されて第2,第3油室c2 ,c3 間の隔壁となる内筒部Ciは、それの径方向配設位置を変更設定することで、第2,第3ピストンp2 ,p3 の受圧面積比、延いては可動プーリ半体2の内、外周端部に対する推力F2,F3の分担比率を容易に変更可能である。 By the way, the inner cylinder portion Ci protruding from the pulley cover C and serving as a partition wall between the second and third oil chambers c 2 and c 3 can be changed by changing its radial arrangement position. The pressure receiving area ratio of the third pistons p 2 and p 3 , that is, the ratio of the thrusts F 2 and F 3 to the outer peripheral end of the movable pulley half 2 can be easily changed.

例えば、図4に示す第2実施例では、第1実施例のものよりも前記内筒部Ciの配設位置を径方向内方側に若干寄せて設定したものを示し、これにより、推力F2に対する推力F3の比率が第1実施例よりも若干大きくなっている。   For example, in the second embodiment shown in FIG. 4, the arrangement position of the inner cylinder portion Ci is set slightly closer to the radially inward side than that of the first embodiment, and thereby the thrust F2 is set. The ratio of the thrust F3 to is slightly larger than that of the first embodiment.

更に図5に示す第3実施例(請求項2の発明に対応)では、前記内筒部Ciの配設位置を径方向で最大限内方寄りに設定し、これにより、推力F2に対する推力F3の比率が最大となっている。即ち、この第3実施例では、前記内筒部Ciの内周が前記ボス部2cの外周面に環状シール部材20を介して直接、嵌合する位置まで径方向内方側に最大限寄せて設定されており、これにより、可動プーリ半体2のボス部2bの、前記内筒部Ci内に突入した先端部により、第2油圧シリンダ機構A2における第2ピストンp2 が構成され、この場合、第2油室c2 は、ボス部2bの先端面とプーリカバーCの前面との対向面間に画成される。 Further, in the third embodiment shown in FIG. 5 (corresponding to the invention of claim 2), the disposition position of the inner cylinder portion Ci is set to the maximum inward in the radial direction, thereby the thrust F3 with respect to the thrust F2. The ratio is the largest. In other words, in this third embodiment, the inner circumference of the inner cylinder portion Ci is moved to the maximum inward in the radial direction to the position where it is directly fitted to the outer circumference of the boss portion 2c via the annular seal member 20. Thus, the second piston p 2 in the second hydraulic cylinder mechanism A2 is configured by the tip portion of the boss portion 2b of the movable pulley half 2 that has entered the inner cylinder portion Ci. In this case, The second oil chamber c 2 is defined between the opposing surfaces of the front end surface of the boss portion 2 b and the front surface of the pulley cover C.

この第3実施例によれば、第3油圧シリンダ機構A3のピストンp3 の受圧面積、従って該油圧シリンダ機構A3が可動プーリ半体2の外周端部に及ぼす前進推力F3を、可動プーリ半体2及びプーリカバーCの限られたサイズの中で最大限大きく設定可能となるため、その大きな推力F3により、可動プーリ半体2のプーリ面の溝幅拡開方向への傾きを効果的に防止でき、その傾きに因るプーリ・ベルト間の滑りが効果的に抑えられるから、その間での動力損失を効果的に軽減することができる。その上、可動プーリ半体2の背面内周端部に突設されるボス部2bが、第2油圧シリンダ機構A2のピストン(即ち第2ピストンp2 )に兼用できるため、更なる構造の簡素化が図られ、装置の小型化及びコスト節減が図られる。 According to the third embodiment, the pressure receiving area of the piston p 3 of the third hydraulic cylinder mechanism A3, and therefore the forward thrust F3 exerted on the outer peripheral end of the movable pulley half 2 by the hydraulic cylinder mechanism A3, 2 and the pulley cover C can be set as large as possible within a limited size, and the large thrust F3 effectively prevents the pulley surface of the movable pulley half 2 from tilting in the groove width expanding direction. Since the slip between the pulley and the belt due to the inclination can be effectively suppressed, the power loss between them can be effectively reduced. In addition, since the boss 2b protruding from the inner peripheral end of the back surface of the movable pulley half 2 can also be used as the piston of the second hydraulic cylinder mechanism A2 (that is, the second piston p 2 ), the structure can be further simplified. Downsizing of the apparatus and cost reduction.

以上、本発明の実施例を詳述したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。   As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.

例えば、実施例では、両プーリP,P′間に掛け渡す無端状ベルトとして金属ベルトBを例示したが、本発明では、非金属製のベルトを用いてもよい。   For example, in the embodiment, the metal belt B is exemplified as the endless belt that spans between the pulleys P and P ′. However, in the present invention, a non-metallic belt may be used.

本発明の第1実施例に係る金属ベルト式無段変速機を搭載した車両の動力伝達系のスケルトン図FIG. 1 is a skeleton diagram of a power transmission system of a vehicle equipped with a metal belt type continuously variable transmission according to a first embodiment of the present invention. 第1実施例に係る駆動プーリの全体縦断面図Overall longitudinal sectional view of the drive pulley according to the first embodiment 図2の3−3線拡大断面図3-3 enlarged sectional view of FIG. 第2実施例に係る駆動プーリの、図2と同様の全体縦断面図Overall longitudinal sectional view similar to FIG. 2 of the drive pulley according to the second embodiment 第3実施例に係る駆動プーリの、図2と同様の全体縦断面図Overall longitudinal sectional view similar to FIG. 2 of the drive pulley according to the third embodiment 従来例を示す2タイプの駆動プーリの全体縦断面図Overall longitudinal sectional view of two types of drive pulleys showing a conventional example

符号の説明Explanation of symbols

A・・・・液圧駆動手段
B・・・・無端状ベルト
C・・・・プーリカバー
Ci・・・内筒部
Co・・・外筒部
1 ,c2 ,c3 ・・第1,第2,第3油室
P・・・・駆動プーリ
P′・・・被動プーリ
1 ,p2 ,p3 ・・第1,第2,第3ピストン
T・・・・ベルト溝
1・・・・固定プーリ半体
1k・・・回転軸
2・・・・可動プーリ半体
2b・・・円筒状ボス部
2c・・・シリンダ部
A ··· Hydraulic drive means B ··· Endless belt C ··· Pulley cover Ci · · · Inner tube portion Co · · · Outer tube portion c 1 , c 2 , c 3 ··· First , Second and third oil chambers P ··· driving pulley P '· driven pulleys p 1 , p 2 , p 3 ··· first, second and third pistons T ··· belt groove 1・ ・ ・ Fixed pulley half 1k ・ ・ ・ Rotating shaft 2 ・ ・ ・ Movable pulley half 2b ・ ・ ・ Cylindrical boss 2c ・ ・ ・ Cylinder

Claims (2)

駆動プーリ(P)及び被動プーリ(P′)間に無端状ベルト(B)を巻き掛け、その両プーリ(P,P′)の溝幅を変更することで両プーリ(P,P′)間の変速比を無段階に変更可能としたベルト式無段変速機であって、
駆動プーリ(P)が、回転軸(1k)を一体的に有する固定プーリ半体(1)と、この固定プーリ半体(1)と協働してベルト溝(G)を形成すると共に回転軸(1k)に摺動可能に支持される可動プーリ半体(2)と、前記溝幅を変更するために可動プーリ半体(2)を固定プーリ半体(1)に対し軸方向に進退駆動し得る液圧駆動手段(A)とを備えたものにおいて、
前記可動プーリ半体(2)の背面には、その背面の内周端部より固定プーリ半体(1)とは反対方向に延びて回転軸(1k)外周に摺動可能に嵌合する円筒状ボス部(2b)と、その背面の外周端部より該ボス部(2b)と同方向に延びるシリンダ部(2c)とが一体に連設され、
前記回転軸(1k)には、可動プーリ半体(2)の背面側を覆うプーリカバー(C)が固定されていて、そのプーリカバー(C)に、前記シリンダ部(2c)よりも大径の外筒部(Co)と、前記シリンダ部(2c)よりも小径で且つ前記ボス部(2b)よりも大径の内筒部(Ci)とが可動プーリ半体(2)側に各々突設され、
前記液圧駆動手段(A)は、前記シリンダ部(2c)及び前記ボス部(2b)間に摺動可能に嵌合されると共に前記内筒部(Ci)の先端に背面が係合する第1ピストン(p1 )と、この第1ピストン(p1 )の前面と前記可動プーリ半体(2)背面との間に画成される第1油室(c1 )と、前記内筒部(Ci)に外周部が摺動可能に嵌合されると共に前記ボス部(2b)に内周部が連結される第2ピストン(p2 )と、この第2ピストン(p2 )の背面と前記プーリカバー(C)との間に画成される第2油室(c2 )と、前記内、外筒部(Ci,Co)間に摺動可能に嵌合されると共に前記シリンダ部(2c)の先端に前面が係合する第3ピストン(p3 )と、この第3ピストン(p3 )の背面と前記プーリカバー(C)との間に画成される第3油室(c3 )とを備え、前記各油室(c1 ,c2 ,c3 )に作動油を供給することで前記可動プーリ半体(2)に前記固定プーリ半体(1)側への推力を生じさせるようにしたことを特徴とする、ベルト式無段変速機。
The endless belt (B) is wound between the driving pulley (P) and the driven pulley (P '), and the groove width of both pulleys (P, P') is changed, so that the distance between both pulleys (P, P ') A belt-type continuously variable transmission capable of changing the transmission ratio of steplessly,
The driving pulley (P) forms a belt groove (G) in cooperation with the fixed pulley half (1) integrally having the rotating shaft (1k), and the rotating pulley (1). The movable pulley half (2) slidably supported by (1k) and the movable pulley half (2) are driven to advance and retract in the axial direction with respect to the fixed pulley half (1) in order to change the groove width. In what is equipped with a hydraulic drive means (A) that can
A cylinder that extends from the inner peripheral end of the back surface of the movable pulley half (2) in the opposite direction to the fixed pulley half (1) and slidably fits on the outer periphery of the rotary shaft (1k). A cylindrical boss portion (2b) and a cylinder portion (2c) extending in the same direction as the boss portion (2b) from the outer peripheral end of the back surface thereof are integrally provided,
A pulley cover (C) that covers the back side of the movable pulley half (2) is fixed to the rotating shaft (1k), and the pulley cover (C) has a larger diameter than the cylinder part (2c). The outer cylinder portion (Co) and the inner cylinder portion (Ci) having a diameter smaller than that of the cylinder portion (2c) and larger than that of the boss portion (2b) project toward the movable pulley half (2). Established,
The hydraulic pressure driving means (A) is slidably fitted between the cylinder part (2c) and the boss part (2b), and a rear surface is engaged with the tip of the inner cylinder part (Ci). 1 piston (p 1 ), a first oil chamber (c 1 ) defined between the front surface of the first piston (p 1 ) and the back surface of the movable pulley half (2), and the inner cylinder portion A second piston (p 2 ) whose outer peripheral part is slidably fitted to (Ci) and whose inner peripheral part is connected to the boss part (2b); and a back surface of the second piston (p 2 ); The second oil chamber (c 2 ) defined between the pulley cover (C) and the inner and outer cylinder parts (Ci, Co) are slidably fitted and the cylinder part ( a third piston front at the tip of 2c) is engaged (p 3), defined between the rear and the pulley cover of the third piston (p 3) (C) The third oil chamber and a (c 3), wherein each of the oil chambers (c 1, c 2, c 3) to the fixed pulley half body said to the movable pulley half body (2) by supplying hydraulic fluid (1 ) A belt type continuously variable transmission characterized in that a thrust to the side is generated.
駆動プーリ(P)及び被動プーリ(P′)間に無端状ベルト(B)を巻き掛け、その両プーリ(P,P′)の溝幅を変更することで両プーリ(P,P′)間の変速比を無段階に変更可能としたベルト式無段変速機であって、
駆動プーリ(P)が、回転軸(1k)を一体的に有する固定プーリ半体(1)と、この固定プーリ半体(1)と協働してベルト溝(G)を形成すると共に回転軸(1k)に摺動可能に支持される可動プーリ半体(2)と、前記溝幅を変更するために可動プーリ半体(2)を固定プーリ半体(1)に対し軸方向に進退駆動し得る液圧駆動手段(A)とを備えたものにおいて、
前記可動プーリ半体(2)の背面には、その背面の内周端部より固定プーリ半体(1)とは反対方向に延びて回転軸(1k)外周に摺動可能に嵌合する円筒状ボス部(2b)と、その背面の外周端部より該ボス部(2b)と同方向に延びるシリンダ部(2c)とが一体に連設され、
前記回転軸(1k)には、可動プーリ半体(2)の背面側を覆うプーリカバー(C)が固定されていて、そのプーリカバー(C)に、前記シリンダ部(2c)よりも大径の外筒部(Co)と、前記ボス部(2c)の先端部に内周部が摺動可能に嵌合する内筒部(Ci)とが可動プーリ半体(2)側に各々突設され、
前記液圧駆動手段(A)は、前記シリンダ部(2c)及び前記ボス部(2b)間に摺動可能に嵌合されると共に前記内筒部(Ci)の先端に背面が係合する第1ピストン(p1 )と、この第1ピストン(p1 )の前面と前記可動プーリ半体(2)背面との間に画成される第1油室(c1 )と、前記ボス部(2b)の、前記内筒部(Ci)内に突入した先端部により構成される第2ピストン(p2 )と、この第2ピストン(p2 )の背面と前記プーリカバー(C)との間に画成される第2油室(c2 )と、前記内、外筒部(Ci,Co)間に摺動可能に嵌合されると共に前記シリンダ部(2c)の先端に前面が係合する第3ピストン(p3 )と、この第3ピストン(p3 )の背面と前記プーリカバー(C)との間に画成される第3油室(c3 )とを備え、前記各油室(c1 ,c2 ,c3 )に作動油を供給することで前記可動プーリ半体(2)に前記固定プーリ半体(1)側への推力を生じさせるようにしたことを特徴とする、ベルト式無段変速機。
The endless belt (B) is wound between the driving pulley (P) and the driven pulley (P '), and the groove width of both pulleys (P, P') is changed, so that the distance between both pulleys (P, P ') A belt-type continuously variable transmission capable of changing the transmission ratio of steplessly,
The driving pulley (P) forms a belt groove (G) in cooperation with the fixed pulley half (1) integrally having the rotating shaft (1k), and the rotating pulley (1). The movable pulley half (2) slidably supported by (1k) and the movable pulley half (2) are driven to advance and retract in the axial direction with respect to the fixed pulley half (1) in order to change the groove width. In what is equipped with a hydraulic drive means (A) that can
A cylinder that extends from the inner peripheral end of the back surface of the movable pulley half (2) in the opposite direction to the fixed pulley half (1) and slidably fits on the outer periphery of the rotary shaft (1k). A cylindrical boss portion (2b) and a cylinder portion (2c) extending in the same direction as the boss portion (2b) from the outer peripheral end of the back surface thereof are integrally provided,
A pulley cover (C) that covers the back side of the movable pulley half (2) is fixed to the rotating shaft (1k), and the pulley cover (C) has a larger diameter than the cylinder part (2c). The outer cylinder part (Co) and the inner cylinder part (Ci) in which the inner peripheral part is slidably fitted to the tip part of the boss part (2c) project from the movable pulley half (2) side. And
The hydraulic pressure driving means (A) is slidably fitted between the cylinder part (2c) and the boss part (2b), and a rear surface is engaged with the tip of the inner cylinder part (Ci). 1 piston (p 1 ), a first oil chamber (c 1 ) defined between the front surface of the first piston (p 1 ) and the back surface of the movable pulley half (2), and the boss portion ( 2b), a second piston (p 2 ) composed of a tip portion that has entered into the inner cylinder portion (Ci), and a space between the back surface of the second piston (p 2 ) and the pulley cover (C). Is slidably fitted between the second oil chamber (c 2 ) defined in the cylinder and the inner and outer cylinder portions (Ci, Co), and the front surface is engaged with the tip of the cylinder portion (2c). the third piston (p 3), the third oil chamber defined between the rear and the pulley cover of the third piston (p 3) (C) to (c 3) The provided, as to cause the thrust to the oil chamber (c 1, c 2, c 3) to the fixed pulley half on the movable pulley half by supplying (2) the hydraulic oil (1) side A belt-type continuously variable transmission characterized by the above.
JP2008111768A 2008-04-22 2008-04-22 Belt type continuously variable transmission Expired - Fee Related JP4999770B2 (en)

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JP4970344B2 (en) * 2008-05-26 2012-07-04 富士重工業株式会社 Hydraulic actuator for belt type continuously variable transmission
JP5848194B2 (en) * 2011-05-30 2016-01-27 本田技研工業株式会社 Method for manufacturing pulley cover in continuously variable transmission

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JP2661346B2 (en) * 1989-09-18 1997-10-08 トヨタ自動車株式会社 Hydraulic control device for continuously variable transmission for vehicles
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EP1271002B1 (en) * 2001-06-18 2004-10-13 Van Doorne's Transmissie B.V. Continuously variable transmission and pulley
DE102005010237A1 (en) * 2004-03-29 2005-10-20 Luk Lamellen & Kupplungsbau Double piston cylinder unit to operate stageless transmission has setting piston inside pressing pressure chamber lying against path disk
JP2007170504A (en) * 2005-12-20 2007-07-05 Toyota Motor Corp Belt type continuously variable transmission
DE102006033652A1 (en) * 2006-07-14 2008-01-17 Hofer Mechatronic Gmbh Continuously variable transmission gearbox has setting cylinders, for axial disk movement, and pressure cylinders with a common feed line and pump

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