Epicyclic-type automatic transmissions are used in automobiles widely. There
are many advantages of epicyclic-type automatic transmissions. It is composed more
densely, smaller and provide higher gear ratio. We can get different output speed by
actuating different clutches or brakes. There are a lot of patents for epicyclic-type
automatic transmissions, but most of them tends to be three degrees of freedom
automatic transmissions or using embedded clutches or brakes and other complex
constructions. It is a better choice if we could use relatively simple manufacturing and
control of two degrees of freedom and external clutches and brakes in the same multi
speeds, speed ratio of the same premise. Therefore, this study aims to propose a set
of design process for two degrees of freedom parallel-connected epicyclic gear
automatic transmissions and computerize the process. First, we established the lever
diagram for eight-speed automatic transmissions. By decomposing lever diagrams to
all possible three-point lines, then composing four different lines to get all possible
eight-speed automatic transmission constructions. Then, we use direct-member
-number method to get member number of all constructions. Determining the
possibility of configuring clutches and brakes, excluding the construction
which can¡¦t configure the clutch and brake, establish the database can be configured.
Finally, we determine a speed ratio for the eight-speed automatic
transmissions, excluding the constructions doesn¡¦t match the appropriate gear ratios.
Drawing the diagram which comply the restriction for eight-speed automatic
transmissions.
Keywords: automatic transmission, lever diagram, direct-member-number method,
member number, configuration of clutches
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0811111-154240 |
| Date | 11 August 2011 |
| Creators | Hsu, Yuan-Che |
| Contributors | Chih-Ching Hung, Nien-Te Liu, Yaw-Hong Kang, Yi-Chang Wu, Cheng-Ho Hsu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0811111-154240 |
| Rights | user_define, Copyright information available at source archive |
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