JPS643867Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flywheel device for suppressing rotational fluctuations and torque fluctuations of an internal combustion engine.

Conventionally, in internal combustion engines, by fixing the flywheel to the end of the crankshaft,
In particular, it was designed to suppress rotational fluctuations and torque fluctuations at low speeds.

However, such conventional flywheels are fixed to the crankshaft, so
Even at high speeds where the flywheel is not required, the flywheel and crankshaft rotate together, resulting in poor acceleration/deceleration response and loss of output.
Furthermore, it caused deterioration in fuel efficiency. Moreover, since the flywheel rotates at high speed, the flywheel causes an increase in rotational noise and rotational vibration.

The present invention has been made with the aim of solving these conventional problems.
For this reason, a clutch is provided between the crankshaft and flywheel of the internal combustion engine to connect and separate them, and a vibration sensor is provided to detect engine vibration.
A rotation speed sensor that detects the engine rotation speed, a clutch control means that controls the operation of the clutch according to the detected engine rotation speed, and a clutch that stops the operation of the clutch control means according to the detected engine vibration. A control stop means is provided to connect the crankshaft and the flywheel by means of a clutch when the engine speed is less than a predetermined value, thereby suppressing engine rotational speed fluctuations and torque fluctuations; In this case, the clutch is used to separate the crankshaft flywheel from the crankshaft flywheel in order to improve acceleration/deceleration response, output, fuel efficiency, and noise reduction. Furthermore, even if the engine speed is above a predetermined value, when abnormal vibrations are detected, the crankshaft and flywheel are connected to suppress torque fluctuations and rotational fluctuations at high speeds.

The present invention will be explained below based on an embodiment shown in FIGS. 1 and 2.

First, referring to FIG. 1, a flywheel 4 is attached to an end of a crankshaft 2 of an internal combustion engine 1 via a clutch 3, which will be described later. Clutch 3 is the second
It is configured as shown in the figure. That is, a disc-shaped flywheel 4 is rotatably attached to the end of the crankshaft 2 via a bearing 5, and a shaft 6 of the flywheel 4 has a bearing 7 attached to a supporting part of an engine body (not shown). It is rotatably supported through. In addition, crankshaft 2 has
A thin disc-shaped movable plate 8 is attached to the flywheel 4 via a key 9, and this movable plate 8 rotates integrally with the crankshaft 2, but is slidable in the axial direction of the crankshaft 2. ing. Here, dog clutches 3a and 3b are attached to opposing surfaces of the flywheel 4 and the movable plate 8, respectively.

Further, a fixed plate 10 facing the movable plate 8 is attached to the crankshaft 2. A plurality of springs 11 are stretched between the fixed plate 10 and the movable plate 8, and the spring force presses the movable plate 8 toward the flywheel 4 to engage the dog clutches 3a and 3b. This allows the crankshaft 2 and flywheel 4 to rotate together.

On the other hand, an electromagnet 12 is attached to the fixed plate 10, and when it is energized, it attracts the movable plate 8 against the force of the spring 11, thereby disengaging the clutches 3a and 3b, thereby disengaging the crankshaft 2 and flywheel 4. I am trying to disconnect from it.
Incidentally, reference numeral 13 is a slip ring for transmitting a current (clutch disengagement signal) from a control unit 14 (described later) to the electromagnet 12.

The control unit 14 includes an ignition coil 1
The ignition signal from 5 is input, and the engine speed is detected from this. Further, the control unit 14 is configured to cause current to flow from its output terminal to the electromagnet 12 via the slip ring 13 when the detected engine speed is above a predetermined value. The control unit 14 also includes an internal combustion engine 1.
A signal is input from a vibration sensor 16 that is attached to the cylinder block of the engine and detects abnormal vibrations.
No current is allowed to flow from the output terminal of the control unit 14 to the electromagnet 12. here,
The control unit 14 serves as a rotational speed sensor, clutch control and stop means, and clutch speed control means.

Next, the operation of the device having such a configuration will be explained.

When the engine speed is less than a predetermined value according to the signal from the ignition coil 15, the control unit 1
4 does not allow current to flow through the electromagnet 12 from its output terminal. Therefore, since the electromagnet 12 is not excited, the movable plate 8 is pressed by the force of the spring 11 and the dog clutches 3a and 3b are engaged, so that the crankshaft 2 and the flywheel 4 rotate together. This makes it possible to suppress engine rotational fluctuations and torque fluctuations at low rotational speeds.

Further, when the engine speed exceeds a predetermined value, a current flows from the output terminal of the control unit 14 to the electromagnet 12 via the slip ring 13. This excites the electromagnet 12, and this electromagnet 12
The suction force causes the movable plate 8 to slide to the left in FIG. 2 against the force of the spring 11, and the meshing clutch 3
Since a and 3b are separated, the connection between the crankshaft 2 and the flywheel 4 is severed. Therefore, it is possible to improve responsiveness of acceleration and deceleration at high speeds of an engine that does not require a flywheel, improve output, improve fuel efficiency, and reduce noise.

Further, when the vibration sensor 1 detects abnormal vibration, the control unit 14 sends the electromagnet 12
Crankshaft 2 without applying current to
This maintains the connection between the flywheel 4 and the flywheel 4, and suppresses torque fluctuations and rotational fluctuations at high speeds.

As explained above, the present invention connects the crankshaft and flywheel when the engine speed is less than a predetermined value, and separates the crankshaft and flywheel when the engine speed is above a predetermined value. Therefore, it is possible to suppress torque fluctuations and rotational fluctuations at low speeds, and to improve acceleration/deceleration responsiveness, output, fuel efficiency, and noise reduction at high speeds. In addition, the crankshaft and flywheel are connected when abnormal vibration occurs even if the engine speed is above a predetermined value, so torque fluctuations and rotational fluctuations can be suppressed, for example, when one cylinder does not explode. .

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the main part of FIG. 1. 2... Crankshaft, 3a, 3b... Dog clutch, 4... Flywheel, 8... Movable plate, 12
...Electromagnet, 14...Control unit, 16...
vibration sensor.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine having a flywheel rotated by a crankshaft, a clutch is provided between the crankshaft and the flywheel to connect and separate them, and a vibration sensor for detecting engine vibration and a rotation speed sensor for detecting engine speed are provided. a clutch control means that receives a signal from the rotational speed sensor and controls the operation of the clutch so as to separate the crankshaft and the flywheel when the engine rotational speed is equal to or higher than a predetermined value; A flywheel device for an internal combustion engine, characterized in that a clutch control stop means is provided for stopping the operation of the clutch control means so as to connect a crankshaft and a flywheel when the clutch control means is detected.