JPH0816503B2 - Balancer device for reciprocating engine - Google Patents

Description

The present invention relates to a balancer device for a reciprocating engine.

2. Description of the Related Art Conventionally, most balancers of reciprocating engines, as shown in FIG. 1, drive an unbalanced weight by driving the engine with a chain, a toothed belt or a gear.

That is, the crankshaft 1A and the camshaft 2A of the reciprocating engine, the sprocket 3A and the unbalanced exciter 5A through the chain.
The balancer attempts to reduce the vibration of the engine by driving the motor and adjusting the vibration force generated from the vibration exciter 5A so as to reduce the force generated by the engine.

Note that FIG. 1 (b) is provided with two vibrators 5A.

It has a plurality of rotating bodies to adjust the direction and magnitude of the exciting force, and an unbalanced exciter that uses a motor instead of direct drive with a chain or gear to drive in an electrically synchronized manner. The one shown in Fig. 2 has also been recently developed.

In the figure, a is a drive motor, b is an unbalanced flywheel, and c is a bearing.

Since the balancer as shown in Fig. 1 needs to be changed in mechanical structure at the time of installation, it must be possible to install it at the time of setting, and the installation is costly and time consuming after vibration becomes a problem. It is practically inconvenient.

Further, the electric balancer shown in FIG. 2 is easier to install newly than the mechanical type balancer shown in FIG. 1, but it is very difficult to reduce the size and weight, and a complicated mechanism is required. Therefore, the cost is very high, which is inconvenient.

Further, since both of the above methods are unbalanced vibration methods, only the vibration force of only the rotational speed component of the vibration exciter can be generated.

Therefore, multiple balancers are needed to balance multiple orders.

It is not easy to adjust the magnitude of the exciting force, and usually only the exciting force proportional to the square of the rotation speed is produced, and if it is attempted to be adjustable, the control is very complicated and impractical.

In addition, the vibration of the two-cycle engine that occurs at a certain rotation speed is obtained by trial operation or calculation, and the primary and secondary component vibration waveforms (= 1/1, 1/1 / of the rotation speed) for generating the excitation force that cancels the vibration The waveform and the gain of the cycle of 2) are obtained in advance, and when actually operating the reciprocating engine, by vibrating the engine based on the primary and secondary component vibration waveforms with the above-mentioned phase and gain adjustment. There is also a technology that tries to cancel the vibration.

This technique is effective for a small engine, but the damping effect may be insufficient for a large multi-cylinder engine having vibrations of higher or third order components.

By the way, recently, there is a demand for an engine with lower vibration, and as described above, not only the vibration of the primary component but also k
(= 1 to n, where n is a positive integer) Vibration of the next component (1 / the number of rotations)
It has become an issue to reduce the vibration of n times the cycle).

Furthermore, since the engine vibration changes not only with the number of revolutions but also with the load, a vibration reduction device that can follow the load is also needed.

In order to meet such needs, the present invention provides a hydraulic cylinder to which hydraulic pressure is introduced from a hydraulic source via an electromagnetic servo valve, and a hydraulic piston that reciprocates in the hydraulic cylinder by supplying and discharging pressurized oil, An inertial mass fixed to the outer ends of piston rods projecting from both ends of the piston and penetrating seals and bearings at both ends of the hydraulic cylinder, and the force generated by the reciprocating motion of the inertial mass is applied to the reciprocating engine. Balancer head for transmission, rotation order reference signal generator that generates rotation order signal based on rotation reference signal input from the outside, and phase adjustment of rotation order signal based on known cancellation phase corresponding to rotation reference signal And the load-dependent characteristic control that sets the gain of the rotation order signal based on the load signal input from the outside and the known load / cancellation gain characteristics. Device, each order number dependent gain adjuster for multiplying the canceling phase adjusted rotating order signal by the set gain, and each order for synthesizing the canceling phase adjusted rotating order signal multiplied by the canceling gain It is an object of the present invention to provide a balancer device for a reciprocating engine including a waveform synthesizer and a control device including an electromagnetic servo valve controller that outputs a control amount corresponding to the waveform to the electromagnetic servo valve.

The operation of the present invention having the above structure will be described with reference to FIG. 5 by taking a case of a two-cycle engine as an example.

The present invention generates the vibration waveform A of the first to fifth order components based on the rotation reference signal obtained by the rotation reference signal generator, and determines the phase and gain of the waveform of each component corresponding to the rotation speed and the load. After setting the phase and gain for canceling, the waveform B (= the one that generates the exciting force for canceling the engine vibration) is obtained, and the signal corresponding to the waveform is applied to the balancer head as the exciting force C. , To reduce the vibration of the engine.

An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 3 shows the overall configuration of the embodiment, where 0 is a reciprocating engine, 1 is a balancer head, 2 is a hydraulic power source, 3 is a control device, 4 is a rotation reference signal generator, 5 is a load condition and a balancer head. Is a control signal line for transmitting activation / deactivation of the control device 3 to the control device 3.

FIG. 4 shows a configuration diagram of the balancer head 1.
Is an electromagnetic servo valve, 7 is a hydraulic cylinder, 8 is a hydraulic piston, 9 is a seal / bearing, 10 is an inertial mass, 11 is a displacement measuring instrument, 12 is an acceleration measuring instrument, 13 is a mounting jig, and 16 is a soundproof protective cover. , The inertial mass 10 is displaced left and right by the pressure oil supplied to and discharged from the left and right piston chambers, thereby vibrating the engine through the mounting jig 13 (Practical application Sho 56
-A large one with a configuration similar to No. 161201).

Next, the operation of the control device 3 will be described with reference to FIG.

When the rotation reference signal is input from the rotation reference signal generator 4, the rotation order reference signal generator 3-1 outputs the kth order (k = 1 to 1).
The rotation order signal (= waveform) of n) is generated.

In each order phase adjuster 3-2, a phase (= canceling phase) corresponding to a k-th order signal for canceling engine vibration generated at a certain speed is obtained in advance and stored. The kth-order rotation order signal generated by the reference signal generator 3-1 is input and the phase of each rotation order signal is adjusted to the corresponding cancellation phase.

On the other hand, when the load signal is input, the load dependence characteristic control device 3-3 cancels the gain corresponding to each of the kth rotation order signals (generated at a certain load) on the basis of the load / cancellation gain characteristics obtained in advance. The gain corresponding to the kth-order rotation reference signal for canceling the engine vibration is set.

Each order-rotation speed-dependent gain adjuster 3-4 receives the output from each order phase adjuster 3-2 and the load-dependent characteristic control device 3-3, and outputs to each of the phase-adjusted k-th order rotation order signals. Multiply the set gain.

Each order waveform synthesizer 3-5 includes a phase adjuster 3-2 for each order.
And the kth-order rotation order signal adjusted to the cancellation phase and multiplied by the cancellation gain in each order-speed-dependent gain adjuster 3-4, and the electromagnetic servo valve controller 3-6 corresponds to the combined waveform. The control amount is output to the electromagnetic servo valve 6 of the balancer head 1.

As a result, the inertial mass 10 moves in the direction of canceling the engine vibration, and the vibration force due to this is transmitted to the engine 0 through the mounting jig 13, and the vibration of the engine 0 is reduced.

Line 3-7 is the feedback of the displacement amount of the balancer head 1.

Further, by operating the balancer head 1, the balancer head 1 is operated only near the natural frequency of the engine 0 where vibration is a problem, or a balance force depending on the load is generated. Is easily possible.

An example in which the balancer head 1 is operated / stopped is shown in FIG.

8 to 10 show the mounting relationship of the displacement direction β of the balancer head 1 with respect to the vibration direction α of the engine. FIG. 8 shows the mounting of the engine against vibration in the direction perpendicular to the cylinder, and FIG. Mounting against vibration in the load direction,
FIG. 10 shows the mounting condition against vibration in the crankshaft direction.

As described above in detail, the present invention provides a hydraulic cylinder in which hydraulic pressure is introduced from a hydraulic source via an electromagnetic servo valve, a hydraulic piston that reciprocates in the hydraulic cylinder by supplying and discharging pressurized oil, and The inertial mass is fixed to the outer ends of the piston rods protruding from both ends of the piston and penetrating the seals and bearings at both ends of the hydraulic cylinder, and the force generated by the reciprocating motion of the inertial mass is applied to the reciprocating engine. A balancer head to be transmitted, a rotation order reference signal generator that generates a kth rotation order signal based on a rotation reference signal input from the outside, and a kth rotation based on a known cancellation phase corresponding to the rotation speed reference signal. Each order phase adjuster that adjusts the phase of the order signal, and a negative value that sets the gain of the k-th order signal based on the load signal input from the outside and known load / cancellation gain characteristics. And dependency control unit, and the cancellation phase-adjusted k following each order rotational speed multiplying each said set gain to the rotational order signal dependent gain controller,
Control consisting of each order waveform synthesizer that synthesizes the kth rotation order signal that has been subjected to the cancellation phase adjustment and multiplied by the cancellation gain, and an electromagnetic servo valve controller that outputs a control amount corresponding to the waveform to the electromagnetic servo valve Since it is provided with the device, (1) it is possible to reduce the vibration of higher-order components of the third order or higher.

(2) Vibration that follows the rotation speed and the load can be reduced.

(3) If the cancellation phase and the gain corresponding to the rotation speed and the load are obtained, it can be easily added to the existing reciprocating engine.

Such an effect is extremely useful in practice.

[Brief description of drawings]

FIG. 1 (a) is an explanatory view showing a mechanical drive type balancer,
FIG. 2B is an explanatory view showing a device provided with two unbalanced vibration exciters, FIG. 2 is an explanatory view showing an electric balancer, and FIG.
FIG. 4 is an explanatory diagram showing the overall configuration of a balancer device according to an embodiment of the present invention, FIG. 4 is an explanatory diagram showing the balancer head of FIG. 3, FIG. 5 is an explanatory diagram showing the operation of the balancer device, and FIG.
FIG. 7 is an explanatory view showing an intermittent operation by the balancer device, FIG. 7 is an explanatory view showing the operation of the control device of FIG. 3, and FIGS. Is. 1 ... balancer head, 2 ... hydraulic power source, 3 ... control device, 4 ... rotation reference signal generator, 5 ... control signal line, 6 ... servo valve, 7 ... hydraulic cylinder, 8 ...
Hydraulic piston, 10 ... inertia mass.

Continuation of front page (56) Reference JP 58-211048 (JP, A) JP 58-217838 (JP, A) JP 55-101839 (JP, A)

Claims (1)

[Claims] 1. A hydraulic cylinder into which hydraulic pressure is introduced from an oil pressure source via an electromagnetic servo valve, a hydraulic piston that reciprocates in the hydraulic cylinder by supplying and discharging pressurized oil, and hydraulic pressures protruding from both ends of the piston. A balancer head consisting of an inertia mass fixed to the outer ends of piston rods that penetrate the seals and bearings at both ends of the cylinder, and a balancer head that transmits the force generated by the reciprocating motion of the inertia mass to the reciprocating engine, and an external input The rotation order reference signal generator that generates the rotation order signal based on the rotation reference signal, each order phase adjuster that adjusts the phase of the rotation order signal based on the known cancellation phase for the rotation speed signal, and the external input Load-dependent characteristic control device that sets the gain of the rotation order signal based on the load signal and the known load / cancellation gain characteristic, and the cancellation-phase-adjusted circuit. Corresponding to each waveform, each order-speed-dependent gain adjuster that multiplies the order signal by the above-mentioned gain, each order-waveform synthesizer that combines the canceling-phase-adjusted rotation-order signal multiplied by the canceling gain, and A balancer device for a reciprocating engine, comprising: an electromagnetic servo valve controller that outputs a control amount to the electromagnetic servo valve;