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Continuously variable transmission

A continuously variable transmission, primary technology, applied in the direction of transmissions, elements with teeth, transmission control, etc.

Active Publication Date: 2019-07-02
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The piston area of ​​the primary pulley and the piston area of ​​the secondary pulley are, for example, important factors affecting the output required for the electric oil pump at the time of shifting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 2 Embodiment approach

[0115] This embodiment is the same as the first embodiment in that the PRI piston area is made smaller than the SEC piston area, but the PRI piston area is set in consideration of not only the above-mentioned downsizing of the electric oil pump 123 but also other factors. Each of the elements considered will be described below.

[0116] (component durability)

[0117] Figure 9 It is a graph showing the relationship between the PRI piston area and the PRI pressure at the time of maximum thrust, with the vertical axis being the PRI pressure and the horizontal axis being the PRI thrust. The maximum thrust mentioned here is the thrust required to realize a predetermined gear ratio under the strictest condition, that is, when the torque transmitted from the engine 1 is the maximum torque when the gear ratio is the lowest gear ratio.

[0118] Such as Figure 9 As shown, the smaller the PRI piston area, the higher the PRI pressure under the same thrust. Therefore, component dura...

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Abstract

The purpose of the invention is to provide a continuously variable transmission in which the relationship in magnitude between a piston area of a primary pulley and a piston area of a secondary pulleyis specified. As a means for achieving this purpose, this continuously variable transmission (4) comprises: an electric oil pump (123) that is arranged in an oil path (106) between a piston oil chamber (41c) of a primary pulley (41) and a piston oil chamber (42c) of a secondary pulley (42); and a control unit (10) that controls the entry / exit of oil to / from the piston oil chamber (41c) of the primary pulley (41) by the electric oil pump (123). A piston area (41c) of the primary pulley (41) of the continuously variable transmission (4) is smaller than a piston area (42c) of the secondary pulley (42).

Description

technical field [0001] The invention relates to a continuously variable transmission. Background technique [0002] JP2002-523711A discloses a continuously variable transmission in which the entry and exit of engine oil into and out of the primary pulley oil chamber is controlled by an electric oil pump arranged in an oil passage between the primary pulley oil chamber and the secondary pulley oil chamber. Contents of the invention [0003] However, the above documents do not mention the size relationship between the piston area of ​​the primary pulley and the piston area of ​​the secondary pulley. For example, the piston area of ​​the primary pulley and the piston area of ​​the secondary pulley are important factors affecting the output required for the electric oil pump at the time of gear shifting. That is, in the continuously variable transmission of the above document, there is room for studying the magnitude relationship between the piston area of ​​the primary pulle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H9/12F16H61/30
CPCF16H61/30F16H61/66259F16H61/0031F16H9/12F16H37/0846F16H47/065F16H61/66263F16H2037/0886
Inventor 寺井启
Owner NISSAN MOTOR CO LTD
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