Hydraulic servo for friction coupling element of automatic transmission
A hydraulic servo is described for a friction coupling element in an automatic transmission including a casing, the hydraulic servo, comprising: an annular drum having a first cylinder, a second cylinder, and a side wall connecting the first and second cylinders all integrally formed together as a single piece by press forming, the first cylinder having splines on its outer cylindrical surface and fixed to the interior of the casing through the splines and the second cylinder having splines on its inner cylindrical surface; a press-formed third cylinder joined to the side wall of the annular drum by a fully encircling weld; a piston fitted between the first cylinder and the third cylinder; and biasing means provided between the third cylinder and the second cylinder for returning the piston.
- Assignee:
- Aisin-Warner Limited and Toyota Jidosha Kabushiki Kaisha
- Patent Number(s):
- US 4682534
- OSTI ID:
- 6395669
- Resource Relation:
- Patent File Date: Filed date 29 Jul 1985
- Country of Publication:
- United States
- Language:
- English
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