JPH02229941A - Fly wheel for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable execution of reliable transmission of a power without damaging the riding feeling of a vehicle by a method wherein a surface vibration amount of the joint of a fly wheel secured on a crank shaft through a resilient plate is reduced to a value lower than a specified value. CONSTITUTION:With a crank shaft 1 of an internal combustion engine rotated, a fly wheel 5 is reliably rotated by means of a resilient plate 2 formed in a manner to increase rigidity in a rotation direction. Since a surface vibration amount of a joint 5a of a flywheel 5 during rotation is below 0.1mm, engagement between the fly wheel 5 and a clutch facing is extremely smoothly effected. This constitution enables reliable transmission of torque from an engine to an output shaft without producing longitudinal vibration of a car body floor by which a uncomfortable feeling is imparted to a human organism.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a flywheel for an internal combustion engine.

BACKGROUND OF THE INVENTION Conventionally, a flywheel constituting a power transmission system from an internal combustion engine has been directly connected to a crankshaft in order to mainly reduce torsional vibrations of this transmission system. However, in this type, bending vibration occurs due to the mass of the flywheel, and this bending vibration tends to cause abnormal noises such as rattling noise in the passenger compartment of a vehicle.

Therefore, it has been proposed to reduce abnormal noise by changing the natural bending frequency of the crankshaft system from the normal range by connecting the crankshaft and flywheel via an elastic plate (for example, 57-58542).

Problems to be Solved by the Invention However, in such conventional examples, due to machining errors between the elastic plate and the flywheel, when the club facing and the flywheel are connected (during power transmission), the joining surface of the flywheel This results in a face-to-face encounter. The surface runout of the flywheel joint surface and engine torque fluctuations combine to produce vibrations in the power transmission system, and these vibrations are further amplified by vibrations originating from the engine, causing damage to the vehicle floor. It has been pointed out that post-moe vibration causes discomfort to the human body.

Therefore, the present invention has been made with the aim of solving the above-mentioned problems of the prior art.

A further means for solving the problem, that is, the flywheel for an internal combustion engine of the present invention is characterized in that the runout of the joint after being fixed to the crankshaft via an elastic plate is 0.1 cm or less. It is something.

As a result of the present invention having the above-mentioned characteristic configuration, longitudinal vibration of the vehicle floor caused by vibration of the joint surface of the flywheel is suppressed when the flywheel and the cladding facing are joined.

Example Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 shows an embodiment of the present invention, and in this figure, l is the crankshaft of an internal combustion engine. An inner peripheral edge 2a of a substantially disk-shaped elastic plate 2 having high rigidity in the rotational direction and low rigidity in the bending direction is fastened and fixed to the shaft end of the crankshaft l by bolts 4 through reinforcing members 3. be.

On the other hand, a substantially disk-shaped flywheel 5 is fixed to the outer peripheral end 2b of the elastic plate 2 with a port 7 via a reinforcing member 6. This flywheel 5 has a mounting hole 8 at its inner peripheral end fitted into the cylindrical part 3a of the reinforcing member 3 so as to be movable in the axial direction, and an inner peripheral end thereof is fitted into the flange part 3b of the reinforcing member 3.
and the elastic plate 2 so that a predetermined gap is created between them. After the flywheel 5 is thus fixed to the crankshaft l via the elastic plate 2, the engaging portion 9 (or 9, to) between the shaft end of the crankshaft l and the elastic plate 2 is fixed. As a processing standard, the runout of the joint surface 5a that comes into sliding contact with the cludge facing (not shown) is 0, I
The joint 5a has been modified so that it is less than zm. I1 is a ring gear, and this ring gear 1l is fixed to the outer peripheral end of the elastic plate 2. This ring girl 1l
is meshed with a pinion gear of a starter motor (not shown), and is used to transmit the rotation of the starter motor to the crankshaft 1 when starting the internal combustion engine.

No. FIG. 2 shows experimental results showing the correlation between the amount of surface runout of the joint 5a of the flywheel 5 and the longitudinal vibration of the vehicle floor. Normally, the longitudinal vibration of the vehicle floor that does not cause discomfort to the human body is considered to be 0.1 G or less. Incidentally, as shown in this figure, the longitudinal vibration of the vehicle floor increases in proportion to the increase in the amount of surface runout of the flywheel 5. However, as in this embodiment, by making the amount of vibration of the joint 5a of the flywheel 5 less than Olxz, the longitudinal vibration of the vehicle floor can be reduced to 0. ! It can be suppressed to below G.

According to the structure of the embodiment described above, when the crankshaft 1 of the internal combustion engine rotates, the flywheel 5 is reliably rotated by the elastic member 2 which is formed to have a large rigidity in the rotational direction. During this rotation, the amount of vibration of the joint 5a of the flywheel 5 is 0. Since it is less than 1 mx, the flywheel 5 and clutch facing can be joined extremely smoothly. Therefore, as shown in FIG. 2, torque can be reliably transmitted from the engine to the output shaft without causing vibrations in the vehicle floor that cause discomfort to the human body.

Effects of the Invention As described above, the present invention reduces the amount of surface run-out of the joint of the flywheel fixed to the crankshaft via the elastic plate to less than O, I ym, so that the flywheel run-out is not caused by the occurrence of flywheel run-out. The front and rear vibrations of the car body floor cause discomfort to the human body! It is suppressed to an impossible range. Therefore, there is a great practical effect of being able to reliably transmit power without impairing the ride comfort of the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flywheel installed in an internal combustion engine showing an embodiment of the present invention, and FIG. 2 is a diagram showing the correlation between the amount of runout of the flywheel and the longitudinal vibration of the vehicle floor. 1... Crankshaft, 2... Elastic plate, 5...
Flywheel, 5a...joint.

Claims (1)

[Claims] (1) In the flywheel of an internal combustion engine, which is fixed to the crankshaft via an elastic plate and has a joint surface that comes into sliding contact with the clutch facing during power transmission, the joint surface after being fixed to the crankshaft via the elastic plate. A flywheel for an internal combustion engine characterized by a surface runout of 0.1 mm or less.