Flywheel for internal combustion engine

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Element is plate with external edge completely surrounding...

Reexamination Certificate

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Details

C464S092000, C192S200000

Reexamination Certificate

active

06280334

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to improvements in a flywheel for an internal combustion engine.
A flywheel for an internal combustion engine generally has a characteristic that a bending vibration based on mass of a mass member tends to generate if the mass member is in direct contact with a crankshaft of an internal combustion engine. Such bending vibration tends to cause noises for occupants in a passenger compartment in a vehicle. In order to suppress such noises, an attempt for varying the frequency of the bending characteristic vibration from a regular range has been executed. For example, JP-A-9-217791 discloses such arranged flywheel for an internal combustion engine. This flywheel is arranged such that a crankshaft of the engine is connected to a mass member through a flexible plate having a bending flexibility. More specifically, a diametrically inner portion of the flexible plate is fixed to the crankshaft by means of installation bolts, and a diametrically outer portion of the flexible plate is connected to the mass member. In a clearance defined by the flexible plate and the mass member, a washer plate is disposed so as to be able to be in contact with the mass member. A center portion of the washer plate is installed to the crankshaft.
SUMMARY OF THE INVENTION
Although this conventional flywheel performs an excellent bending vibration damping performance, the installation structure of the washer plate to the crankshaft invites a large projection of installation bolts. This projection of the installation bolts will affect an arrangement of a clutch apparatus connected to the flywheel.
It is an object of the present invention to provide an improved flywheel that enables an installation of a spring member without increasing a projecting amount of installation bolts while improving a damping performance of bending vibration.
A flywheel according to the present invention is for an internal combustion engine and comprises an flexible plate connected to a crankshaft of the engine. A mass member is connected to the flexible plate. A clearance is formed at a diametrically outer portion with respect to a connecting portion of the flexible plate to the crankshaft. A spring member is disposed in the clearance. Both ends of the spring member are in contact with clearance defining surfaces of the clearance.


REFERENCES:
patent: 5362276 (1994-11-01), Fuehrer et al.
patent: 5515745 (1996-05-01), Tsuruta et al.
patent: 5868624 (1999-09-01), Fukushima et al.
patent: 5908095 (1999-06-01), Jackel et al.
patent: 6039651 (2000-03-01), Fukushima et al.
patent: 9-217791 (1997-08-01), None

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