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AssigneeAisin Aw Co., Ltd.
InventorsTakao Taniguchi, Shoichi Miyagawa, Kazumasa Tsukamoto, Shiro Sakakibara, Takeshi Inuzuka, Masashi Hattori, Hirofumi Nozawa
Estimating the term…
An infinitely variable transmission has a gear neutral (GN) point and serves as an output member by torque circulation. When a pulley ratio thereof is within a predetermined range from the GN point, a coasting state occurs which may hinder smooth torque transmission based on the transmission efficiency and generate a great engine braking effect (failure in the transmission resulting from the coasting state) based on a large gear ratio. When the pulley ratio assumes a predetermined value that may cause failure in transmission resulting from the coasting state, upon release of the accelerator pedal, an electronic throttle system performs control such that the engine outputs a predetermined torque. Thus a positive driving state is always established. In this state, the continuously variable transmission (CVT) is shifted in the upshift direction to escape rapidly from a range defined by the pulley ratio of the predetermined value.
An infinitely variable transmission for use with an output shaft of a power source and wheels, comprising:
A method of operating an infinitely variable transmission that includes an input shaft connected to an output shaft of a power source, an output member connected to wheels, and a continuously variable transmission having a first rotating member connected to said input shaft and a second rotating member, comprising the steps of:
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Transmission for changing ratio: the transmission being a continuously variable transmission
Toothed gearing combined with continuously variable friction gearing: the toothed gearing having orbital motion
Controlling of shifting being influenced by a signal derived from the engine and the main coupling: using electrical or electronical sensing or…
At least one power path being a continuously variable transmission, i.e. CVT: cVT using endless flexible members
Term ended 24 Oct 2017 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of Invention
The invention relates to an infinitely variable transmission (IVT) that establishes torque circulation in combination with a planetary gear set and, more specifically, to an infinitely variable transmission that establishes a neutral state using the torque circulation.
2. Description of Related Art
The invention will be described reference to the drawings in which:
FIG. 1 is a front sectional view of an infinitely variable transmission according to the invention;
FIG. 2 is a velocity diagram of the infinitely variable transmission;
Preferred embodiments of the invention will now be described with reference to the accompanying drawings. As shown in FIG. 1, an infinitely variable transmission 1 for use with motor vehicle includes a first shaft 3 aligned with an engine crankshaft 2, a second shaft 4, a third shaft 5(a, b) aligned with a front axle, and a fourth shaft 6 that includes a countershaft. A primary (first) pulley 7 is disposed on the first shaft 3, and a secondary (second) pulley 9 is disposed on the second shaft 4. A belt 10 is wound around both the pulleys 7, 9, thus providing a belt-type continuously variable transmission 11.
In addition, the first shaft 3 is directly connected to the engine crankshaft 2 through a damper device 12 for absorbing engine torque fluctuations, so that the first shaft 3 constitutes an input shaft. The input shaft 3 includes a shaft 3a that is spline-fitted to a stationary sheave 7a of the primary pulley 7 and a boss portion 7a1 of the stationary sheave 7a. An input-side member 13 of a low clutch C.sub.L is fixed to the shaft 3a constituting the input shaft 3, and an output member 15 of the low clutch C.sub.L is rotatably supported on the input shaft 3. The output member 15 is integrally connected to a primary-side sprocket 18, which constitutes a constant-speed transmission device 16. The stationary sheave 7a of the primary pulley 7, which constitutes the input shaft 3, is connected to an oil pump 17. A movable sheave 7b is axially movably supported on the stationary sheave 7a through a hydraulic actuator 7c, which will be described later.
The second shaft 4 includes a stationary sheave 9a of the secondary pulley 9. A movable sheave 9b is axially movably supported on the stationary sheave 9a through a hydraulic actuator 9c. Furthermore, a high clutch C.sub.H and a planetary gear set 19 are disposed on the second shaft 4, and a secondary-side sprocket 20 and an output gear (output member) 21 are also rotatably supported on the second shaft 4.