JPH04290640A - Flywheel - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the function of a clutch mechanism with the lapse of time by removing a frictional slide part from a clutch mechanism for regulating the relative turn between the divided mass bodies. CONSTITUTION:A mass body is divided into the first and second mass bodies 3 and 17, and a flywheel 1 is formed by connecting these bodies by a torsional damper 15 and a clutch mechanism 32, and the clutch mechanism 32 is constituted of a shaft part 9 formed on the first mass body 3, cylinder part 25 having the larger diameter than the shaft part 9 formed on the second mass body 17, and a spiral shaped elastic member 27 in which the outer peripheral edge 28 is welded to the inner peripheral surface 29 of the cylinder part 25 and the inner peripheral edge 30 is welded to the outer peripheral surface 31 of the shaft part 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel attached to the end of a crankshaft.

0002

[Prior Art] This type of flywheel reduces rotational fluctuations of the crankshaft due to fluctuations in engine torque, damps torsional vibrations of the crankshaft, and enables smooth power transmission to the output shaft via the clutch. Various improvements have been made.

For example, the flywheel disclosed in Japanese Utility Model Application Publication No. 160343/1983 divides a mass body (inertia body) and connects the divided mass bodies with a clutch mechanism and with a torsional damper. When starting the engine, a clutch mechanism restricts the relative rotation between the divided mass bodies to improve engine startability, but when the engine speed exceeds a predetermined rotation speed, the clutch mechanism disengages and the clutch mechanism restricts the relative rotation between the two mass bodies. By allowing relative rotation, the torsional damper functions to effectively absorb and damp engine torque fluctuations and accompanying crankshaft torsional vibrations.

0004

However, as shown in FIG.
is pressed against the outer peripheral part 104 of the other mass body 103 by the spring 105, and both mass bodies 101, 103 are pressed by the frictional force of the friction material 102.
It is designed to integrate. Therefore, as the friction material 102 wears, the spring force of the spring 105 that presses it changes (decreases), and the friction force generated at the sliding contact between the friction material 102 and the other mass body 103 decreases, and the friction surface When abrasion powder or the like adheres to the clutch mechanism, the friction coefficient of the sliding contact portion changes and the frictional engagement force changes, so there is a concern that the function of the clutch mechanism may deteriorate over time.

[0005] Accordingly, an object of the present invention is to provide a flywheel that can eliminate the problems of the conventional example.

[0006]

[Means for Solving the Problems] That is, in the present invention, mass bodies are arranged oppositely in the axial direction of a crankshaft, one of these mass bodies is fixed to the crankshaft, and this one mass body is fixed to the crankshaft. and the other mass body are torsionally
The flywheel is connected by a damper and connected by a clutch mechanism, the clutch mechanism being formed on the side of one of the two mass bodies facing the other mass body. a shaft, a cylindrical portion formed on the side of the other mass body facing the one mass body with a diameter larger than that of the shaft portion, and a spiral connecting the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the shaft portion. It is characterized by being constructed with a shaped elastic member.

[0007]

[Operation] When one mass body and the other mass body rotate slightly relative to each other when starting or stopping the engine,
Since the spiral elastic member is stretched between the cylindrical portion and the shaft portion, both mass bodies are thereafter rotated together by the action of the clutch mechanism.

On the other hand, when the engine accelerates, the directions of relative rotation of the two mass bodies are reversed to those at the time of starting the engine, allowing the relative rotation of the two mass bodies without tension of the spiral elastic member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a flywheel 1 in an installed state showing one embodiment of the present invention, and in this figure, 2 is a crankshaft. A first mass body 3 and a reinforcement plate 4 are fixed to the shaft end of the crankshaft 2 with bolts 5. The first mass body 3 is composed of a substantially disk-shaped elastic plate 6, a torsional damper case 7, and a cylindrical shaft portion 9 fixed to an inner cylindrical portion 8 of the torsional damper case 7. .

Among these, torsional damper case 7
is an annular spring holding member 10 fixed to the side surface of the elastic plate 6.
It consists of a substantially disc-shaped side plate 12 fixed to the outer circumferential end of the elastic plate 6 together with a spacer 11, and a spring holding member 13 fixed to the side surface of this side plate 12. Both spring holding members 10, 13
A plurality of spring receiving parts 14 are formed in the circumferential direction, and a torsional damper (compression coil spring) 1 is installed in this spring receiving part 14.
It accommodates 5. The inner peripheral portion of the side plate 12 of the torsional damper case 7 and the elastic plate 6 are fixed with rivets 16 at a predetermined interval.

[0012] 17 is a second mass body. This second mass body 17 includes a substantially hollow disc-shaped main body 18 and a main body 18
It consists of a damper connecting part 20 fixed with bolts 19 to
The damper connecting portion 20 is assembled to the first mass body 3 so as to be able to rotate relative to it by a predetermined angle, and the plate portion 21 thereof
The spring receiving portion 22 formed in the torsional damper 15
The torsional damper 15 is connected to the first mass body 3 via the torsional damper 15. The inner peripheral end of the damper connecting portion 20 is rotatably supported by a bearing 23 fitted to the reinforcement plate 4. Note that 24 is a stopper hole formed in the plate portion 21 of the damper connecting portion 20. This stopper hole 24 is
The elongated hole is shaped to engage with the rivet 16 with a predetermined gap so that the mass body 3 and the second mass body 17 can rotate relative to each other by a predetermined angle.

On the other hand, a cylindrical portion 25 is formed at the outer peripheral end of the main body portion 18 and extends toward the first mass body 3 (left side in the figure).
An annular space 26 is formed between this cylindrical portion 25 and the shaft portion 9 of the first mass body 3. Then, the spiral elastic member 27 is accommodated in the annular space 26, and as shown in FIG.
At the same time, the inner peripheral end 30 of the spiral elastic member 27 is welded to the outer peripheral surface 31 of the shaft portion 9, and the shaft portion 9, the spiral elastic member 27, and the cylindrical portion 25 form a clutch mechanism. 32 is formed.

As shown in FIG. 2, the spiral elastic member 27 is made of a material such as a plate-shaped spring steel wound so as to rapidly expand in diameter from the shaft portion 9 toward the cylindrical portion 25. Therefore, the cylindrical part 2
5 (second mass body 17) slightly rotates in the counterclockwise direction in FIG. 2 with respect to shaft portion 9 (first mass body 3) (phase shifts)
As shown in FIG. 3, most of the spiral elastic member 27 comes into close contact with the inner peripheral surface 29 of the cylindrical portion 25, and the spiral elastic members 27 overlap on the outer peripheral side, so that the spiral elastic member 27 The tension prevents relative rotation of both mass bodies 3 and 17. Further, the spiral elastic member 27 is connected to the cylindrical portion 2 in FIG.
5 (second mass body 17) remains stationary, shaft portion 9 (first mass body 3) rotates counterclockwise in the figure (phase shifts)
, it deforms so as to wrap around the shaft portion 9, but in the state shown in this figure, relative rotation between the two is not prevented. Therefore, it is possible to relatively rotate the two mass bodies 3 and 17 to a large extent (shift the phase) compared to the state shown in FIG. It is considered that excessive stress will not be generated on the spiral elastic member 27 by controlling the engagement portion of the spiral elastic member 27. Note that the cross-sectional dimensions, material, etc. of the spiral elastic member 27 are determined so that the buckling phenomenon does not occur in the state shown in FIG.

33 is a friction force generating means, and this friction force generating means 33 connects the elastic plate 6 of the first mass body 3 and the second mass body 1.
It is interposed between the damper connecting portion 20 of No. 7 and the damper connecting portion 20 of No. 7. This friction force generating means 33 includes a friction plate 34 and a retainer plate 35.
and a spring member 36, which generates a frictional force when the first mass body 3 and the second mass body 17 rotate relative to each other, and damps torsional vibrations transmitted from the first mass body 3 to the second mass body 17. .

Reference numeral 37 denotes a ring gear fixed to the outer peripheral end of the second mass body 17, and this ring gear 37 is adapted to mesh with a pinion gear of a starter motor (not shown). In addition, flywheel 1 is operated by a starter motor (not shown).
The rotated state is shown in FIG.

Reference numeral 38 denotes a clutch disc that is spline-fitted to the output shaft 39, and this clutch disc 38 is connected to the clutch facing 4 that is frictionally engaged with the second mass body 17.
It is equipped with 0. Further, 41 is a clutch cover assembly attached to the second mass body 17.

According to the structure of the above embodiment, during idling, the spiral elastic member 27 is in the state shown in FIG.
Relative rotation between the mass body 3 and the second mass body 17 is allowed. In this state, the rotational force of the engine is
It is transmitted to the second mass body 17 via the mass body 3 and the torsional damper 15, and the torsional damper 15 and the friction force generating means 33 absorb and damp the impact force and torsional vibration caused by the torque fluctuation.

When the engine accelerates, the shaft portion 9 of the first mass body 3 in FIG. 2 rotates counterclockwise (out of phase) with respect to the cylindrical portion 25 of the second mass body 17 in FIG. The shaped elastic member 27 deforms into the state shown in FIG.
, 17 are not prevented from rotating relative to each other. Therefore, the rotational force of the engine during engine acceleration is transmitted to the second mass body 17 via the first mass body 3 and the torsional damper 15, and is caused by the torque fluctuation by the torsional damper 15 and the frictional force generating means 33. Absorbs and damps impact force and torsional vibration.

When the engine starts, when the rotational force of the starter motor (not shown) is input to the second mass body 17 via the ring gear 37, the cylindrical portion 25 of the second mass body 17 in FIG.
rotates counterclockwise with respect to the shaft portion 9 of the first mass body 3 (
Since the spiral elastic member 27 is deformed into the state shown in FIG. 3 and 17 rotate together.

[0021] When stopping the engine, the first mass body 3 of the rotating flywheel 1 is braked.
The relationship between the two mass bodies 3, 17 and the spiral elastic member 27 is the same as that shown in FIG. 3 when the engine is started, and the first mass body 3 and the second mass body 17 rotate together.

As described above, in this embodiment, the clutch function 32 for regulating the relative rotation between the first mass body 3 and the second mass body 17 is provided.
The clutch mechanism 32 is composed of a shaft portion 9, a spiral elastic member 27, and a cylindrical portion 25, and there is no frictional sliding part unlike the conventional example, so there is no risk of deterioration of the function of the clutch mechanism 32 over time. The rotation between the mass bodies 3 and 17 can be reliably restricted for a long period of time.

In this embodiment, the shaft portion 9 is formed in the first mass body 3 and the cylindrical portion 25 is formed in the second mass body 17, but the shaft portion 9 is formed in the second mass body 17. The cylindrical part 2
5 may be formed on the first mass body 3.

[0024]

Effects of the Invention As explained above, the present invention arranges mass bodies facing each other in the axial direction of the crankshaft, fixes one of these mass bodies to the crankshaft,
A flywheel in which one mass body and the other mass body are connected by a torsional damper and both are connected by a clutch mechanism, and the clutch mechanism is connected to one of the mass bodies by a clutch mechanism. A shaft portion formed on the side of the mass body facing the other mass body, a cylindrical portion formed on the side of the other mass body facing the one mass body, the inner peripheral surface of this cylindrical portion and the outer periphery of the shaft portion. By constructing the clutch mechanism with a spiral elastic member that connects the surface, frictional sliding parts can be eliminated from the clutch mechanism, so there is no risk of deterioration of the clutch mechanism's function over time, and the Rotation can be controlled reliably over a long period of time, further improving the reliability of the flywheel.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flywheel showing one embodiment of the present invention.

FIG. 2 is a front view of the clutch mechanism.

FIG. 3 is an operating state diagram of the clutch mechanism when the starter motor is started.

FIG. 4 is a diagram showing the operating state of the clutch mechanism during engine acceleration.

FIG. 5 is an enlarged sectional view of main parts of a conventional clutch mechanism.

[Explanation of symbols]

1...Flywheel, 2...Crankshaft, 3,17
...Mass body, 9...Shaft part, 15...Torsional damper, 2
5... Cylindrical part, 27... Spiral elastic member.

Claims (1)

[Claims] Claim 1: Mass bodies are arranged opposite to each other in the axial direction of the crankshaft, one of these mass bodies is fixed to the crankshaft, and the one mass body and the other mass body are connected to each other by a torsional damper. and a clutch mechanism, the clutch mechanism being formed on the side of one of the two mass bodies facing the other mass body. a cylindrical portion having a larger diameter than the shaft portion formed on the side of the other mass body facing the one mass body, and a spiral shape connecting the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft portion. A flywheel characterized by comprising an elastic member.