Continuously variable transmission control system for vehicle and work vehicle
US-9222581-B2 · Dec 29, 2015 · US
Continuously variable transmission
US10865859B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10865859-B2 |
| Application number | US-201616461935-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 24, 2016 |
| Priority date | Nov 24, 2016 |
| Publication date | Dec 15, 2020 |
| Grant date | Dec 15, 2020 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
An object of the present invention is to provide a continuously variable transmission in which a magnitude relationship between a piston area of a primary pulley and a piston area of a secondary pulley is specified. As means for achieving the object, a continuously variable transmission includes: an electric oil pump disposed in an oil path between a piston oil chamber of a primary pulley and a piston oil chamber of a secondary pulley; and a controlling portion configured to control the entry and exit of oil in the piston oil chamber of the primary pulley by the electric oil pump. A piston area of the primary pulley in the continuously variable transmission is smaller than a piston area of the secondary pulley.
First claim
Opening claim text (preview).
The invention claimed is: 1. A continuously variable transmission comprising: an electric oil pump disposed in an oil path between a piston oil chamber of a primary pulley and a piston oil chamber of a secondary pulley; and a controlling portion configured to control entry and exit of oil in the piston oil chamber of the primary pulley by the electric oil pump, wherein a piston area of the primary pulley is smaller than a piston area of the secondary pulley, and is set to a minimum magnitude satisfying a lower limit of an area at which: (i) an amount of leak in the oil path at a time when a thrust of the primary pulley is maximum does not exceed a supply flow rate limiting value set in advance based on a leak characteristic of the oil path to a hydraulic pressure of the piston oil chamber of the primary pulley, and (ii) a hydraulic pressure of the piston oil chamber of the primary pulley at a time when a thrust of the primary pulley is maximum does not exceed an upper limit hydraulic pressure determined based on a pressure resistance of a component used in a hydraulic circuit.
Assignees
Inventors
Classifications
- F16H61/66259Primary
using electrical or electronical sensing or control means · CPC title
with switching means, e.g. to change ranges · CPC title
using auxiliary pumps, e.g. pump driven by a different power source than the engine · CPC title
CVT using endless flexible members · CPC title
the mechanical gearing comprising gearing of the friction or endless flexible member type · CPC title
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- What does patent US10865859B2 cover?
- An object of the present invention is to provide a continuously variable transmission in which a magnitude relationship between a piston area of a primary pulley and a piston area of a secondary pulley is specified. As means for achieving the object, a continuously variable transmission includes: an electric oil pump disposed in an oil path between a piston oil chamber of a primary pulley and a…
- Who is the assignee on this patent?
- Nissan Motor
- What technology area does this patent fall under?
- Primary CPC classification F16H61/66259. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Dec 15 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).