JP2562086Y2 - Variable inertia flywheel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable inertia flywheel having a main flywheel connected to a crankshaft of an internal combustion engine, and a sub flywheel detachable from the main flywheel.

[0002]

2. Description of the Related Art Conventionally, a variable inertia flywheel disclosed in Japanese Utility Model Publication No. Sho 60-32448 is known.

In this variable inertia flywheel, a variable flywheel is rotatably supported via a thrust bearing on a flywheel body fixed to a crankshaft of an internal combustion engine, and the variable flywheel is moved relative to the flywheel body. It has a structure that can be disengaged by hydraulic urging means. Therefore, by rotating the variable flywheel integrally with the main flywheel when the internal combustion engine is rotating at a low speed, the inertial mass of the variable flywheel can be increased to reduce fluctuations in the engine rotational speed. By rotating only the wheel body, the inertial mass of the wheel body can be reduced and the rising response of the engine rotation can be improved.

[0004]

However, in the conventional variable inertia flywheel, the inertial mass of the flywheel changes discontinuously at a predetermined rotational speed of the internal combustion engine. There is an inconvenience that vibration is generated due to a sudden change in generated torque. Ie variable
Flywheels allow more freedom in mass selection in the same space
If it is composed of solids to increase
The shock during the disengagement between the wheel (that is, between solids)
Torque suddenly changes at the point where the inertial mass changes.
And the problem such as vibration is likely to occur.

The present invention has been made in view of the above circumstances, and has as its object to provide a variable inertia flywheel capable of smoothly changing an inertial mass with a change in the rotation speed of an internal combustion engine. .

[0006]

In order to achieve the above object, the present invention comprises a main flywheel connected to a crankshaft of an internal combustion engine, and a sub flywheel detachable from the main flywheel. in the variable inertia flywheel, <br/> main flywheel by centrifugal force at a plurality of positions of the outer peripheral portion of the weight plurality of movable in the radial direction each provided Rutotomoni, the inner surface of the respective weight, secondary flywheel
A sub-flywheel, which is formed on a circular arc surface along the outer peripheral surface of the weight, is supported by a main flywheel via a bearing on the radially inner side of the weight by a bearing, and the inner surface of the weight and the sub-fly are The outer circumference of the wheel
A viscous fluid is interposed in the gap between the surface and the viscous fluid and the weight
A viscous fluid coupling is formed by the inner surface and the outer peripheral surface of the sub flywheel, and the sub flywheel is detachable from the main flywheel via the viscous fluid coupling .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of the variable inertia flywheel, and FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a cross-sectional view showing a high-speed rotation state, and FIG. 4 is a graph showing a change in inertial mass with respect to the rotation speed.

As shown in FIG. 1, a variable inertia flywheel F is mounted at an end of a crankshaft 1 of an internal combustion engine, and a rotation of the crankshaft 1 is transmitted to a position facing the variable inertia flywheel F. A clutch C for transmitting to the input shaft 2 is provided.

The variable inertia flywheel F has a substantially disk-shaped main flywheel 4 fixed to the crankshaft 1 with bolts 3. An annular space 4a is recessed inside the main flywheel 4, and an annular space 4a is formed in the annular space 4a .
An annular sub-flywheel 6 made of a solid and supported on its inner periphery by a ball bearing 5 as a bearing,
The main flywheel 4 is disposed so as to be rotatable relative to the main flywheel 4. The annular space 4a of the main flywheel 4 is closed in a liquid-tight manner by a cover plate 8 fixed with bolts 7 via a sealing member 9, and the inside thereof is filled with a viscous fluid 10 so as to fill the outer periphery of the sub-flywheel 6. Is done.

Referring to FIG. 2 together, it is apparent that
At a plurality of locations on the outer periphery of the annular space 4a of the main flywheel 4, concave portions 4b are formed radially outward. A weight 11 is supported movably in the radial direction inside each recess 4b, and a coil spring 13 is disposed in a spring chamber 12 formed between the outer surface of the weight 11 and the inner surface of the recess 4b. Weight 1
1 is provided with a communication groove 11a on the sliding surface of the main flywheel 4 with the concave portion 4b, and the annular space 4a and the spring chamber 12 are communicated with each other through the communication groove 11a. Is allowed.

The inner surface of the weight 11 is formed as an arc surface centered on the crankshaft 1, that is, an arc surface parallel to the outer peripheral surface of the sub flywheel 6 (in other words, along the outer peripheral surface) . The crankshaft 1 stops and the weight 11
Centrifugal force when not working, cross-sectional circular arc shape gap [delta] ₁ between the outer peripheral surface of the inner surface and the secondary flywheel 6 of the coil spring 13 In the free state the weight 11 is formed. The size of the gap δ ₁ is determined by the annular recess 4 a and the sub flywheel 6.
It is set smaller than the gap δ ₃ with the outer peripheral surface of
When the main flywheel 4 rotates, the rotational force of the main flywheel 4 is transmitted to the sub flywheel 6 by the shearing force of the viscous fluid passing through the gap δ ₁ . When the main flywheel 4 rotates together with the crankshaft 1, the weight 11 moves radially outward against the coil spring 13 by the action of centrifugal force, and finally the inner surface of the weight 11 and the sub flywheel 6 the gap [delta] ₂ between the outer peripheral surface of the larger than the gap [delta] ₃ of the outer peripheral surface of the annular recess 4a and the secondary flywheel 6 (see FIG. 3). Thus, the viscous fluid 10 and the weight 11
The primary and secondary flywheels are
A viscous fluid coupling is formed between the wheels 4,6.

Next, the structure of the clutch C will be described with reference to FIG. Clutch C is a dry single-plate clutch,
It is provided inside a clutch cover 14 integrally connected to the main flywheel 4 by bolts (not shown). A pressure plate 16 is supported on the clutch cover 14 via pins 15 so as to be slidable in the axial direction. The pressure plate 16 abuts on its inner periphery with a diaphragm spring 18 locked on a release bearing 17. And, between the main flywheel 4 and the pressure plate 16,
A facing 20 provided on the outer periphery of the clutch disk 19 spline-coupled to the tip of the transmission input shaft 2 is provided.

Next, the operation of the embodiment of the present invention having the above-described configuration will be described. When the release bearing 17 of the clutch C is in the position shown in FIG. 1, the clutch disc 19 is located between the pressure plate 16 urged leftward by the resilience of the diaphragm spring 18 and the main flywheel 4 of the variable inertia flywheel F. Facing 20 is pinched. As a result, the rotation of the crankshaft 1 is controlled by the main flywheel 4 and the pressure plate 16.
The transmission input shaft 2 is transmitted to the clutch disk 19 from the
Is transmitted to When the release bearing 17 is driven rightward to release the urging of the pressure plate 16 by the diaphragm spring 18, the main flywheel 4 and the pressure plate 16 are disengaged from the clutch disc 19.
Is disengaged and power transmission is interrupted.

When the rotational speed of the crankshaft 1 is low, the centrifugal force acting on the weight 11 provided on the main flywheel 4 of the variable inertia flywheel F is also small. 11 is held in the position of FIG. At this time, since a small gap δ ₁ is formed between the inner surface of the weight 11 and the outer peripheral surface of the sub flywheel 6, the sub flywheel is dragged by the shearing force of the viscous fluid interposed in the gap δ _1. 6 rotates integrally with the main flywheel 4. As a result, the inertial mass of the variable inertia flywheel F is maintained in a large state, and the clearance δ
Due to the buffering action of the viscous fluid interposed in ₁ , the fluctuation of the rotational speed which is remarkable during low-speed operation of the internal combustion engine is effectively absorbed.

On the other hand, when the rotational speed of the internal combustion engine gradually increases, the weight 11 moves radially outward while compressing the coil spring 13 due to the centrifugal force acting on the weight 11, so that the size of the gap is increases from [delta] ₁ to [delta] _2. As a result, the shear force of the viscous fluid acting between the weight 11 and the sub flywheel 6 gradually decreases, and finally the rotation speed of the sub flywheel 6 becomes extremely low, and the inertial mass of the variable inertia flywheel F is reduced. Because of the decrease, a rapid rise of the rotation speed of the internal combustion engine becomes possible.

As can be seen with reference to FIG. 4, the inertial mass of the variable inertia flywheel F varies smoothly as the rotational speed of the internal combustion engine increases or decreases between about 1000 RPM and 2000 RPM. Can be prevented, and the occurrence of a shock during acceleration or deceleration can be avoided.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and does not depart from the present invention described in the claims for utility model registration.
Various small design changes can be made.

For example, although the variable inertia flywheel F of the embodiment is integral with the clutch C, the variable inertia flywheel F can be provided independently of the clutch C.

[0020]

As described above, according to the present invention, the action of the viscous fluid coupling disposed between the two flywheels by supporting the sub flywheel made of solid material inside the main flywheel via bearings. With this, the amount of transmission of the driving force from the main flywheel to the sub-flywheel is continuously changed, and the viscous fluid coupling action is performed through a plurality of weights provided at a plurality of locations on the outer periphery of the main flywheel. Since the flywheels are sufficiently transmitted to each other, even if the secondary flywheel is made of a solid material to increase the degree of freedom in selecting the mass, and is supported inside the main flywheel via a bearing ( That is, even if the mutual engagement and disengagement of the two flywheels is the mutual engagement and disengagement of the solids which are liable to cause a shock, the sufficient viscous fluid coupling action based on the plurality of weights is not sufficient. The inertia mass of the flywheel can be continuously increased or decreased according to the operating speed of the internal combustion engine, and as a result, when the internal combustion engine accelerates and decelerates, a sudden change in the inertia mass of the flywheel causes a shock Inconvenience can be effectively prevented. Also
In particular, align the inner surface of each weight with the outer
To the inner surface of the weight and the sub flywheel.
Between the outer peripheral surface and the viscous fluid
And a viscous fluid coupling is directly connected between the main and sub flywheels.
Because it is formed, both flywheel mutual disengagement machine
The structure as a whole is extremely simplified and the number of parts is minimized
Cost savings, assembly workability,
This can contribute to improvement in maintenance workability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a variable inertia flywheel according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 showing a low-speed rotation state;

FIG. 3 is a sectional view corresponding to FIG. 2 and showing a high-speed rotation state;

FIG. 4 is a graph showing a change in inertial mass with respect to a rotation speed.

[Explanation of symbols]

1 ... crankshaft 4 ... main flywheel 6 ... sub flywheel 10 ... viscous fluid 11 .. weight [delta] ₁ ... gap [delta] ₂ ... clearance

Claims (1)

(57) [Scope of request for utility model registration] 1. A variable inertia flywheel comprising a main flywheel (4) connected to a crankshaft (1) of an internal combustion engine, and a sub flywheel (6) detachable from the main flywheel (4). in the main flywheel (4) of the outer peripheral portion of Rutotomoni provided movable plurality of weight in the radial direction by the centrifugal force at a plurality of locations (11) respectively, the inner surfaces of the weight (11), sub hula
Formed on an arc surface along the outer peripheral surface of the wheel (6),
An auxiliary flywheel (6) made of a solid is supported on a main flywheel (4) via a bearing (5) on a radially inner side of the weight (11), and
The inner surface of the weight (11) and the sub flywheel (6)
In the gap (δ ₁ , δ ₂ ) between the outer peripheral surface and the viscous fluid (1
0) , the viscous fluid (10) and the weight (11)
A viscous fluid coupling is formed by the inner surface and the outer peripheral surface of the sub flywheel (6) , and the sub flywheel (6) is detachable from the main flywheel (4) via the viscous fluid coupling. , Variable inertia flywheel.