Title:
TWO-SPEED TRANSMISSION, METHOD OF LEARNING μ-V CHARACTERISTICS OF SAID TWO-SPEED TRANSMISSION, AND METHOD OF CONTROLLING GEARSHIFT BY SAID TWO-SPEED TRANSMISSION
Document Type and Number:
WIPO Patent Application WO/2024/018887
Kind Code:
A1
Abstract:
[Problem] To prevent the occurrence of gearshift shock in a two-speed transmission which is able to shift a reduction ratio between two stages, high and low. [Solution] A two-speed transmission 1 is provided with a learning function in which, on condition that predetermined learning start conditions are met, mode changeover between a first mode and a second mode is carried out, and in the inertia phase during the mode changeover, the coefficient of friction between first friction plates 30 and second friction plates 31 is computed on the basis of the output torque of a drive motor 2 and the angular acceleration of the output shaft 11 of the drive motor 2, to obtain a μ–V property, which is the relationship between the coefficient of friction μ, and differential rotation V, which is the difference in the rotational speeds of any two elements among the elements constituting a planetary transmission mechanism 9.
Inventors:
YAMAMOTO AKIHIRO (JP)
KIMURA SHINGO (JP)
KIMURA SHINGO (JP)
Application Number:
PCT/JP2023/024671
Publication Date:
January 25, 2024
Filing Date:
July 03, 2023
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16D48/06; F16H59/14; F16H59/42; F16H61/04
Foreign References:
| JP2016125648A | 2016-07-11 | |||
| JP2020085073A | 2020-06-04 | |||
| JPH05116549A | 1993-05-14 |
Attorney, Agent or Firm:
KIWA INTERNATIONAL (JP)
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