JPH076545U - Torsional vibration reduction device - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the torsional vibration reduction device of the present invention is to reduce the output torque fluctuation and to reduce the size and weight of the flywheel, to greatly reduce the torsional vibration of the engine drive system, and to reduce its weight and size. It is to provide a torsional vibration reduction device capable of [Structure] Machines with large torsional vibration excited by fluctuating torque, such as diesel engines and press machines, are equipped with a plurality of eccentric flywheels whose rotational speed changes according to the rotation of the main shaft. Vibration reduction device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration reduction device applied to a reciprocating rotary machine such as a diesel engine due to torque fluctuation. The present invention can be applied to prevent torsional vibration of not only the above-mentioned engine but also press machines, compressors, pumps and the like. It can also be applied as a torque fluctuation device (torsion shaker).

[0002]

[Prior art]

 A conventional example will be described with reference to FIGS. FIG. 6 is a front view of a conventional torsional vibration reduction measure, and FIG. 7 is a side view of FIG. Conventionally, a flywheel is used as shown in FIGS. 6 and 7 as a method for reducing the vibration due to the torque fluctuation of a rotating machine such as an engine. That is, the flywheel 9 having a large inertia is attached to the main shaft 2 of the engine and is rotated to absorb the fluctuation of the torque in the flywheel 9 having a large inertia to reduce the torque.

[0003]

[Problems to be solved by the device]

 When reducing torque by the conventional method, a very large flywheel of both size and weight is required to reduce the reduction below a certain level, which not only makes the weight and cost excessive but also prevents sudden acceleration and deceleration. It is also not practical. Large flywheels also cause vibrations and shaft breakage, and are a source of noise such as muffled noise in automobiles.

The object of the present invention is to eliminate the above-mentioned problems, to reduce fluctuations in output torque, to reduce the size and weight of a flywheel, and to greatly reduce torsional vibration of a drive system such as an engine, to reduce weight and size. A simple torsional vibration reduction device is provided.

[0005]

[Means for Solving the Problems]

 The torsional vibration reduction device of the present invention is equipped with a plurality of eccentric flywheels whose rotational speed changes in accordance with the rotation of the main shaft in a machine such as a diesel engine, a press machine, or the like which has a large torsional vibration excited by fluctuating torque. Is characterized by.

[0006]

[Action]

 Taking a 4-cycle 2-cylinder engine as an example, the torque fluctuation that occurs is based on the fluctuation of (rotation speed) × (number of cylinders) × 1/2 = (rotation speed) × 2 × 1/2 = rotation speed × 1 It will be a wave. In order to counteract this, a flywheel that generates torque fluctuations (rotation speed) x 1 synchronized with the engine may be installed. Therefore, when an eccentric flywheel is used as shown in FIG. 1, a required torque fluctuation can be generated because the flywheel undergoes one speed fluctuation per revolution.

For other numbers of cylinders, a speed regulator such as an accelerating / decelerating machine may be connected as shown in FIG. That is, the present invention devises a method of balancing torque fluctuations by utilizing that torque fluctuations are synchronized with rotation. In other words, the mechanism that the rotational angular speed changes in synchronization with the torque fluctuation cancels the torque fluctuation and reduces the torque fluctuation on the output shaft, which leads to the reduction of the size of the flywheel and the reduction of the vibration. is there.

[0008]

【Example】

 A first embodiment according to the present invention will be described with reference to FIGS. 1 is a front view of the first embodiment, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 4 is a view showing a principle of torque fluctuation with a torque fluctuation of the main shaft, and FIG. 5 is generated from a machine. FIG. 3 is a diagram for canceling the fluctuating torque of the machine and reducing the torsional vibration by combining the torque of the opposite phase and the torque of the opposite phase.

The vibration reducing device of the present invention may be mounted on the output side or the opposite side of the shaft, and the first embodiment is mounted on the output side. An eccentric flywheel 7 for the spindle is attached to the spindle 2 of the reciprocating machine 1 and meshes with the eccentric flywheel 6. The eccentric flywheel 6 is supported by the support cover 4 via a flywheel shaft 5 and a bearing 3.

FIG. 4 shows the principle of generation of the generated torque in which the torque fluctuation of the spindle 2 leads to the angular velocity fluctuation of the eccentric flywheel 6, and the torque fluctuation of the spindle 2 due to the eccentric flywheel 6 is 180 degrees out of phase. As shown in FIG. 5, the torque generated by the device of the present invention is applied in the opposite phase (180 degrees) from the torque generated by the machine to cancel the fluctuation torque of the machine and reduce the torsional vibration.

A second embodiment according to the present invention will be described with reference to FIG. FIG. 3 is a front view of the second embodiment. FIG. 3 is a schematic view in which a torsional vibration reduction device is attached via an acceleration / deceleration device. The second embodiment is an embodiment in the case of an engine having four cycles and not two cylinders, and the torsional vibration reducing device of the present invention is attached via an accelerating / decelerating device 8. The structure and operation are the same as those in the first embodiment, and the description thereof will be omitted.

[0012]

[Effect of device]

 By installing the torsional vibration reduction device (torque fluctuation reduction device) of the present invention, the output torque fluctuation can be greatly reduced and the flywheel can be made smaller and lighter than the conventional flywheel, and the torsional vibration of the engine drive system can be reduced. It is possible to reduce the width, make it lighter and more compact.

[Brief description of drawings]

FIG. 1 is a front view of a torsional vibration reduction device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a front view of a second embodiment according to the present invention.

FIG. 4 is a principle diagram of torque generation according to the first embodiment.

FIG. 5 is a diagram for canceling the fluctuation torque of the machine and reducing the torsional vibration by combining the torque generated from the machine of the first embodiment and the torque of the opposite phase.

FIG. 6 is a front view of a conventional example.

FIG. 7 is a side view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reciprocating machine, 2 ... Main shaft, 3 ... Bearing, 4 ... Support cover, 5 ... Flywheel shaft, 6 ... Eccentric flywheel, 7 ... Main shaft eccentric flywheel, 8 ... Accelerator / decelerator.

Claims (1)

[Scope of utility model registration request] 1. A machine, such as a diesel engine or a press machine, which has a large torsional vibration excited by a fluctuating torque, is equipped with a plurality of eccentric flywheels whose rotational speed changes according to the rotation of a main shaft. Torsional vibration reducing device.