192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Patent
1988-09-09
1990-04-24
Lorence, Richard
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
1921062, 464 66, F16H 4502, F16D 350
Patent
active
049192418
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL USEFUL FIELD
This invention relates to a lockup damper for a torque converter having a so-called convex type cover installed between the front cover and a turbine to prevent torsional vibration generated by an engine from being transmitted to a transmission side when a lockup clutch for bringing the torque converter into a non-operating condition is engaged.
BACKGROUND ART
A so-called convex type torque converter, in which a radial intermediate part of a front cover is curved toward the outside for improving rigidity of the front cover and forming a space for housing the lockup damper, has conventionally been known (Published Patent Application (KOKAI) No. 59-222624, Published Utility Model Application (KOKAI) No. 59-139652 or Published Patent Application (KOKAI) No. 58-106246 corresponding to U.S. Pat. No. 4,484,898).
For convex type torque converter, two types have been known: a lug fitting type as illustrated in FIG. 8 and a spline fitting type as illustrated in FIG. 9.
However, because it is necessary to form lugs 100 (notches) on a most outer peripheral part of a piston and an outer peripheral part of a damper in the case of FIG. 8, its weight becomes heavy and it is difficulty to reduce cost.
Further, slap of the lug 100 is apt to arise, for example, during idling in the D-range.
Because two plates 101 of the damper are fastened together by rivets 102 the plate thickness can not be reduced and rigidity maintained. Thus, the cost is increased and the weight becomes heavy.
In the case of FIG. 9, it is necessary to form a spline internal tooth 104 on a damper hub 103 and to machine a spline external tooth also on a turbine hub in which the damper hub 103 fits, so that cost and increase in weight become inevitable.
SUMMARY OF THE INVENTION
An object of the invention is to provide a lockup damper for a torgue converter which is simple in construction, light in weight and inexpensive in cost, and is able to eleminate the foregoing conventional problems and at the same time is suitable for the torque converter having the convex type front cover.
Another features and advantages of the invention will become apparent from the following description with reference to the attached drawings.
STRUCTURE OF THE INVENTION
(1) Technical measure
This invention provides a lockup damper for a torque converter having a convex type front cover curved toward an outside at its radial intermediate part of the front cover to which a power is transmitted; characterized by that an approximately annular disc-like piston, which is curved at its approximate radial intermediate part nearly along the front cover over the entire circumference, is freely slidable in an axial direction; a retaining plate, with holes for radial outside coil springs disposed at plural places on a circumference in said convex portion, is provided on an outer peripheral inside surface of the convex portion of the piston; a side plate, which holds the coil springs from a radial inside, is provided on an inner peripheral inside surface of the covex portion of the piston; spring seats compressing said coil springs are formed on any one or both of the retaining plate and the side plate; a power transmitting driven plate is provided which has claws extending in between the coil springs and is fastened at its inner peripheral part to a turbine hub.
(2) Function
The coil springs are disposed in the space in the convex portion of the piston and the coil springs are held by the thin retaining plate and the side plate, so that the low-cost and light-weight lockup damper becomes obtainable which can eliminate the slap and is suitable for the convex type front cover.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic structural view of a torque converter according to the invention.
FIG. 2 is a vertical sectional partial view of a lockup damper.
FIG. 3 is a view viewed in an arrow III of FIG. 2.
FIG. 4 is a vertical sectional partial view of a retaining plate.
FIG. 4a is a view viewed in an arrow a of FIG. 4.
FIG. 5 is a vertial sectional vie
REFERENCES:
patent: 4143561 (1979-03-01), Melhorn
patent: 4406355 (1983-09-01), Bionaz
patent: 4441595 (1984-04-01), Lamarche
patent: 4484898 (1984-11-01), Kohno
patent: 4572339 (1986-02-01), Koshimo
patent: 4646886 (1987-03-01), Nishimura
patent: 4693348 (1987-09-01), Tsukamoto et al..
patent: 4809830 (1989-03-01), Schierling et al.
Kabushiki Kaisha Daikin Seisakusho
Lorence Richard
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