JPH0384247A - Variable inertia moment fly wheel - Google Patents

Abstract

PURPOSE:To improve the durability and to improve the reliability by a method wherein first and second clutch slide surfaces are concentrically mounted to a planetary gear support plate and a free wheel, respectively, and a centrifugal clutch rockably coupled to a fly wheel and a one-way clutch are provided. CONSTITUTION:A free wheel 3 is rotatably engaged with a fly wheel 1 through three planetary gears 2. The planetary gears 2 are mounted to a planetary gear support plate 6, having a first clutch slide surface 5, by means of a pin 4. A second clutch slide surface 7 is formed to the free wheel 3 concentrically to a first clutch slide surface 5. The planetary gears are rockably coupled to the fly wheel 1 through three centrifugal clutch pins 9. Three one-way pitches 12 are rockably communicated to the fly wheel 1 through respective pins 13 and arranged between a centrifugal clutch 8 and the second clutch slide surface 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a variable moment of inertia flywheel for an engine.

2. Description of the Related Art Conventional variable moment of inertia flywheels include those shown in FIGS. 3 and 4, for example (see Japanese Patent Laid-Open No. 164247/1983).

That is, a flywheel 1 is fixed to a crankshaft 20 of an engine, a freewheel 3 is rotatably fitted therein, and a centrifugal clutch 22 for connecting/disconnecting the freewheel 3 is attached to the flywheel 1.

The centrifugal clutch 21 connects the flywheel l via the bin 22.
and each centrifugal clutch 21
A spring 23 is tensioned between the two, and the biasing force of the spring 23 presses the clutch shoe 24 attached to the centrifugal clutch 21 against the clutch sliding surface 25 formed on the freewheel 3, thereby applying rotational force to the freewheel 3. It is designed to convey.

Thus, at low speeds, centrifugal clutch 2! Since the clutch shoe 24 is pressed against the clutch sliding surface 25 of the freewheel 3, the freewheel 3 rotates together with the flywheel l, increasing its moment of inertia and ensuring idling stability. At high speeds, the centrifugal clutch 21 expands due to centrifugal force, overcoming the biasing force of the spring 23, separating the freewheel 3 from the flywheel l, reducing the moment of inertia acting on the crankshaft 20, and improving responsiveness during acceleration and deceleration. It is designed to increase the

Problems to be Solved by the Invention However, in such a conventional variable moment of inertia flywheel, even at low rotations when the centrifugal clutch 21 is pressed against the freewheel 3, the relationship between the flywheel l and the freewheel 3 remains constant. Since there is a certain degree of rotational difference between the two, in order to sufficiently suppress rotational fluctuations of the crankshaft 20, it is necessary to set a large biasing force of the spring 23 to reduce this rotational difference. When the biasing force of is increased, the centrifugal force acting on the centrifugal clutch 21 overcomes the biasing force of the spring 23, and the rotational speed at which the freewheel 3 is separated from the flywheel l increases, which improves idle stability. There was a problem in that it was difficult to achieve both acceleration responsiveness. Furthermore, when the freewheel 3 is fixed to the flywheel l via a rolling bearing, the rotational difference between the flywheel l and the freewheel 3 becomes large in the high-speed rotation region, causing a phase difference in vibration and resonance. There was also the problem that this excitation force acts on the rolling bearing, reducing its durability.

The present invention has been made by focusing on these conventional problems, and its purpose is to achieve both stability in the low rotation range and responsiveness in the medium and high rotation range,
The objective is to provide a highly durable variable moment of inertia flywheel.

Means for Solving the Problems Therefore, the present invention provides a flywheel fixedly connected to a rotating shaft, a freewheel rotatably connected to the rotating shaft, and an intervening device between the flywheel and the freewheel. a planetary gear supporting a freewheel; and a planetary gear support plate supporting the planetary gear; a first clutch sliding surface is concentric with the planetary gear supporting plate, and a second clutch sliding surface is concentric with the freewheel. A centrifugal clutch and a one-way clutch that are swingably connected to the flywheel are also provided.

At low rotation speeds, the centrifugal clutch is pressed against the first clutch sliding surface of the planetary gear support plate by the biasing force of the spring, and the one-way clutch also has one end in sliding contact with the second clutch sliding surface of the freewheel, and the other end. Press the back side of the centrifugal clutch with. Therefore, the flywheel and the planetary gear support plate are integrated, and the flywheel and freewheel are integrally connected by the centrifugal clutch and the one-way clutch, increasing the moment of inertia and suppressing fluctuations in engine speed.

At medium and high speeds, the centrifugal clutch swings against the biasing force of the spring due to centrifugal force and separates from the first clutch sliding surface, and the back of the centrifugal clutch pushes one end of the one-way clutch and swings the other end. from the second clutch sliding surface. Therefore, the planetary gear support plate is free to separate from the flywheel, and the connection by the centrifugal clutch and one-way clutch is also released, and the freewheel is separated from the flywheel and the moment of inertia is reduced, improving engine responsiveness such as acceleration response. Since the freewheel is supported by a planetary gear, support rigidity is increased and vibration is reduced.

EXAMPLES Hereinafter, the present invention will be explained based on the drawings. FIG. 1 and FIG. 2, which is a cross-sectional view taken along the line A--A, show an embodiment of the present invention.

First, the configuration will be explained. engine crankshaft 20
A freewheel 3 is rotatably fitted to a flywheel 1 fixed to the main body via three planetary gears 2.

The planetary gear 2 is attached by a pin 4 to a planetary gear support plate 6 having a first clutch sliding surface 5. In addition, the freewheel 3 has a second clutch concentrically with the first clutch sliding surface 5.
A clutch sliding mechanism 7 is formed.

Three centrifugal clutches 8 are swingably connected to the flywheel l via pins 9, and each centrifugal clutch 8 is tensioned with a spring lO. Then, due to the biasing force of the spring 10, the clutch L=ll attached to the centrifugal clutch 8 is pressed against the first clutch sliding surface 5, so that the planetary gear support plate 6 is pushed onto the flywheel 1.
The flywheel 1 rotates together with the flywheel 1.

Also, the flywheel 1 has three one-way clutches 1.
2 are swingably connected via a pin 13 and are arranged between the centrifugal clutch 8 and the second clutch sliding surface 7.

Both the flywheel l and the freewheel 3 rotate clockwise in FIG.
A clutch shoe 14 that slides on the clutch sliding surface 7 is attached, and a clutch shoe 14 that contacts the back surface 15 of the centrifugal clutch 8 is attached to the other end that is inclined toward the rotation direction! 6 is installed. The centrifugal force acting on the one-way clutch 12 causes the clutch shoe 14 to be pressed against the second clutch sliding surface 7.

Note that the planetary gear 2 is disposed within the flywheel 1 and freewheel 3 by fixing the gear fixing ring 17 to the flywheel 1 and freewheel 3 with bolts [8].

Next, the effect will be explained. During idling and low speed rotation, the clutch shoe 11 of the centrifugal clutch 8 is pressed against the first clutch sliding surface 5 of the planetary gear support plate 6 by the urging force of the spring 10, and the one-way clutch 12 is pressed against the first clutch sliding surface 5 of the planetary gear support plate 6.
Also, the clutch shoe 14 engages with the second clutch sliding surface 7 of the freewheel 3, and the clutch shoe 16 is pressed against the back surface 15 of the centrifugal clutch 8.

Therefore, rotation of the flywheel is transmitted to the freewheel 3 via the centrifugal clutch 8 and the one-way clutch 12. At the same time, the planetary gear support plate is attached to the flywheel l.
The rotation of the flywheel is transmitted to the freewheel 3 via the planetary gear.

As a result, the flywheel 1 and the freewheel 3 become one and rotate at the same rotational speed, reducing rotational fluctuations and torque fluctuations, thereby ensuring safety.

During medium to high speed rotation, the centrifugal clutch 8 swings against the biasing force of the spring 10 due to centrifugal force, and the clutch shoe 11 separates from the first clutch sliding surface of the planetary gear support plate 6. Further, the centrifugal clutch pushes the one-way clutch 12 with the back surface 15 to swing the one-way clutch 12 and separate the clutch shoe 14 from the second clutch sliding surface 7 of the freewheel 3.

Therefore, the connection between the flywheel l and the freewheel 3 by the centrifugal clutch 8 and the one-way clutch 12 is disconnected. Further, the planetary gear 2 between the flywheel I and the freewheel 3 rotates in the opposite direction to the flywheel I, and does not transmit the rotation of the flywheel 1 to the freewheel 3.

As a result, the freewheel 3 becomes free and does not rotate in synchronization with the flywheel 1, so the moment of inertia acting on the crankshaft decreases and responsiveness increases.

Configured as described in the detailed description of the invention, the invention provides the advantages described below.

While ensuring safety at low engine speeds, it is possible to improve responsiveness at medium and high engine speeds.

Since planetary gears are used, durability and reliability can be improved.

Since the freewheel surface around the axis where the moment of inertia is small can be removed, weight can be reduced.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a transverse sectional view taken along line A-A in Fig. 1, Fig. 3 is a longitudinal sectional view showing a conventional example, and Fig. 4 is a longitudinal sectional view showing an embodiment of the present invention. FIG. 3 is a cross-sectional view of a conventional example. 1... Flywheel, 2... Planetary gear, 3...
Freewheel, 4... Pin, 5... First clutch sliding surface, 6... Planetary gear support plate, 7... Second clutch sliding surface, 8... Centrifugal clutch, 9...・Pin, lO
···spring,! l...Clutch shoe I2.
...One-way clutch, 13...Bin, 14...
Clutch shoe 15... Centrifugal clutch back, I6...
...Clutch shoe 17...Planetary gear fixing ring. Diagram A @ 1-11-Flare 4 or A-1 2---- @ Star gear 3-111 Freef M-11゜5----@1 Cla・/Set # face 6- ---Grief! 8 car top, plate 7 ---- beak 2 cracks, / paddle side 8 ---- f fish tlt/clutch 12 ---- one-way club γza Fig. 4

Claims (1)

[Claims] (1) A flywheel that is fixedly connected to the rotating shaft, a freewheel that is rotatably connected to the rotating shaft, a planetary gear that is interposed between the flywheel and the freewheel and supports the freewheel, and the planetary gear. A planetary gear support plate supporting the gear is provided, a first clutch sliding surface is provided on the planetary gear support plate, a second clutch sliding surface is provided concentrically on the freewheel, and the device is swingably connected to the flywheel. A variable moment of inertia flywheel characterized by being equipped with a centrifugal clutch and a one-way clutch.