Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1993-01-08
1994-01-18
Friedman, Carl D.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74574, 192113AD, F16F 1530, F16D 1372
Patent
active
052791823
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cooling mechanism for a built-up flywheel of split type applicable to motor vehicles such as automobiles, industrial trucks, construction-site vehicles etc.
BACKGROUND ART
A built-up flywheel of the kind referred to above is generally provided with a first flywheel coupled to an output shaft at the engine side, a second flywheel elastically coupled to the rear surface of the first flywheel which is spaced a distance from the second flywheel and a clutch covering body secured to an outer periphery of the rear surface of the second flywheel.
The assignee of the present invention has already proposed some cooling mechanisms for cooling the above clutch covering body. For example, in U.S. Pat. No. 4,886,153, it is proposed that the lateral edge in the circumferential direction of a finger of a diaphragm spring used in the clutch covering body is notched to form wide slits and a vane member is provided in the slits to gather the cooling air.
Although the proposed cooling mechanism is able to cool the interior of the clutch cover effectively, it is not enough to cool the flywheel itself.
Meanwhile, a flywheel cooling mechanism proposed in Japanese Utility Model Laid-open Publication No. 48-43044 (43044/1973) has realized cooling of the flywheel. According to the proposal, a plurality of cooling fins are provided inwards at the side of a pressure plate of the flywheel, thereby raking the air inside the clutch cover to a pressuring surface of the flywheel.
Since the cooling fins are at the side of the pressure plate of the flywheel in the foregoing cooling mechanism and, no allowable space is there for the cooling fins, the area of the surface for each fin cannot be large. Therefore, it is impossible to obtain sufficient driving force (raking force) for the cooling air.
SUMMARY OF THE INVENTION
An essential object of the present invention is to provide a cooling mechanism for a built-up flywheel of split type wherein cooling ports communicating the interior of a clutch covering body and a space between a first and a second flywheels, and cooling grooves generally in the radial arrangement for raking the air inside the clutch covering body which is discharged from the cooling ports outwards in a radial direction are provided in the second flywheel.
In accomplishing the above-described object, according to the present invention, a second flywheel of a built-up flywheel which comprises a first flywheel coupled to an output shaft at the engine side, the second flywheel elastically coupled with a distance to the rear surface of the first flywheel and a clutch covering body secured to an outer peripheral part of the rear surface of the second flywheel has cooling ports formed in the inner periphery thereof which communicate the distance and the inside of the clutch covering body, and cooling grooves generally in the radial arrangement at the front face thereof to guide the air inside the clutch covering body discharged from the cooling ports outwards in a radial direction.
Accordingly, the rotating force at the engine side is transmitted smoothly to the second flywheel through the first flywheel. When the second flywheel is rotated, the pressure at the part in the vicinity of the inner periphery at the front surface of the second flywheel is rendered negative by the action of the cooling grooves, and therefore the air inside the clutch covering body is discharged outside through the cooling ports and guided out along the cooling grooves to the atmosphere.
BRIEF DESCRIPTION OF THE DRAWINGS
This and other objects and features of the present invention will become apparent from the following description taken in conjunction with one preferred embodiment thereof with reference to the accompanying drawings, in which:
FIG. 1 is a cross sectional view of a cooling mechanism according to the present invention; and
FIG. 2 is a front view of a second flywheel.
BEST MODE FOR CARRYING OUT THE INVENTION
Before the description of the present invention proceeds, it is to b
REFERENCES:
patent: 3581855 (1971-06-01), Taeffner
patent: 3809192 (1974-05-01), Stehle
patent: 4139085 (1979-02-01), Kanbe et al.
patent: 4294343 (1981-10-01), Reh
patent: 4727970 (1988-03-01), Reik et al.
patent: 4788884 (1988-12-01), Reik et al.
patent: 4886153 (1989-12-01), Takenaka et al.
Friedman Carl D.
Kabushiki Kaisha Daikin Seisakusho
Yip Winnie
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