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Automatic transmission casing
| Details |
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Inventors: Morisawa, Kunio; Kyushima, Tatsuo;
Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Schroeder; Werner H.
Assistant Examiner: Falik; Andrew M.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner
An automatic transmission for vehicles including a fluid torque converter, a change-over gear mechanism, and an oil pressure control means, wherein the oil pressure control means is substantially composed of a grooved portion formed integrally with the housing of the transmission, a first valve body means adapted to engage a first part of the grooved portion and providing a manual shift valve, and a second valve body means adapted to engage a second part of the grooved portion and providing other hydraulically operated control valves. |
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DETAILED DESCRIPTION We claim: 1.
An automatic transmission, comprising: (a) a casing with an integral grooved portion comprising a plurality of oil passage circuits; (b) a changeover gear mechanism, supported within the casing and including a plurality of oil pressure operated servo mechanisms, which provides various speed stages in accordance with variation of supply of oil pressure to the servo mechanisms; (c) a first valve body member directly engaged with a first part of the grooved portion and which incorporates a manually controlled shift valve which when operated varies supply of oil pressure to the servo mechanisms and changes over the speed stages manually; and (d) a second valve body member directly engaged with a second part of the grooved portion and which incorporates a plurality of hydraulically operated control valves which shift in accordance with supply of oil pressure, and which by shifting varies supply of oil pressure to the servo mechanisms and change over said speed stages automatically.
2.
The transmission of claim 1, further comprising a fluid torque converter, a line pressure control valve and a governor pressure control valve, both of which are located separately from the grooved portion and from the first and second valve body members, and a differential; wherein rotary power is transmitted in a first direction through said torque converter to said changeover gear mechanism, and then, in the opposite direction, to said differential; said line pressure control valve and said governor pressure control valve being located in said opposite direction from said grooved portion; said grooved portion being located on the underneath face of the casing; and wherein said first part of said grooved portion extends from said second part of said grooved portion in said opposite direction and to one side thereof.
3.
The transmission of claim 2, wherein said casing is formed with a support mounting portion and an empty cutter space in said opposite direction from said support mounting portion, said cutter space being bordered along its one lower side to said first part of said grooved portion of said casing; and further comprising a support mounted in the support mounting portion
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