JPH0749768B2 - Intermittent lubrication type lubricator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a device for intermittently supplying lubricating oil, and makes it possible to arbitrarily control the oil supply timing and the amount of oil supply, and in particular the cylinder oil of an internal combustion engine. It is suitable for use in the oil lubrication system.

[Conventional technology]

When there is relative motion between two members such as sliding parts of various equipment, a lubrication method that supplies lubricating oil to reduce friction and prevent wear and heat generation by forming an oil film on the contact surface Often adopted.

For example, it is also possible to inject and lubricate cylinder oil into the sliding portion between the cylinder liner 2 and the piston 3 of a low speed diesel engine 1 used as a marine propulsion engine as shown in FIG. Therefore, the lubrication is performed intermittently during the period of the most appropriate crank angle.

Intermittent lubrication device 4 for cylinder oil injection currently used
Is, for example, as shown in FIG.
Is provided with a plunger pump 6 which is reciprocated by a cam 5 whose drive source is a drive source. The plunger pump 6 boosts the pressure of cylinder oil sucked from an oil sump 7 via a suction check valve 8 and a discharge check valve. A certain amount of cylinder oil is supplied to the sliding portion between the cylinder liner 2 and the piston 3 of the low speed diesel engine 1 via 9.

Therefore, the low speed diesel engine 1 is driven and the plunger pump 6 also operates at the same time, so that the cylinder oil can be constantly supplied during operation.

[Problems to be Solved by the Invention]

In such an intermittent oil supply device 4 for cylinder oil injection, the characteristics of the discharge pressure of the cylinder oil are determined by the cam profile of the cam 5 and the cam rotation speed, so that the injection timing and injection amount of the cylinder oil are optimally controlled. There is a problem that it is difficult and controllability is poor.

Further, the discharge pressure of the cylinder oil boosted by the plunger pump 6 decreases at the same time when the injection is started, and there is a problem that the injection cannot be performed at a constant pressure.

Further, since the time constant at the time of increasing the pressure by the plunger pump 6 depends on the cam rotation speed, there is a problem in that the responsiveness is uneven and it changes depending on the cam rotation speed.

The present invention has been made in view of the problems of the related art, and can directly detect the supply amount and perform feedback control,
It is an object of the present invention to provide an intermittent oil supply type lubricating device which can supply lubricating oil at a predetermined pressure and can arbitrarily change the supply timing and supply amount.

[Means for Solving the Problems] In order to solve the above problems, the present invention is an intermittent lubrication type lubrication apparatus that intermittently supplies a predetermined amount of lubricating oil to a lubrication unit according to operating conditions, and the pressure is boosted by a hydraulic power source. A relief valve that changes the accumulated pressure is installed in the accumulator that accumulates the lubricating oil, while the opening and closing with a throttling function that can change the supply time by changing the opening time width via the flow rate detection means of the lubricating oil from this accumulator. The control signal for controlling the pressure of the lubricating oil sent to the on-off valve is fed back to the relief valve by the detection signal of the flow rate detecting means, and the control signal for controlling the pressure of the lubricating oil is fed back to the relief valve. It is characterized in that a supply amount control means for feeding back a control signal for changing the opening time width to the on-off valve is provided.

[Operation] According to such an intermittent lubrication type lubricating device, the pressurized lubricating oil is put into an accumulator provided with a relief valve such as an electromagnetic proportional relief valve, and this accumulator is passed through a flow rate detecting means and an on-off valve. The lubricating oil is supplied to the lubrication unit by feeding back the supply amount detected by the flow rate detection means to the relief valve to change the value of the pressure accumulated in the accumulator, and the supply at a predetermined pressure without pressure fluctuation. In addition, the detected supply amount is fed back to the opening / closing valve such as a solenoid valve to control the supply amount.

As a result, the relief valve and the on-off valve can be feedback-controlled by the control means to electrically control the supply amount and the supply timing independently of the lubrication unit, and various discharge pressure waveforms can be obtained. Become.

Therefore, in the low speed diesel engine, it becomes possible to easily change the lubrication timing and control the lubrication amount according to the operating state.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view according to an embodiment in which the intermittent lubrication type lubricating apparatus of the present invention is applied to lubrication of cylinder oil of a low speed diesel engine.

The intermittent lubrication type lubrication apparatus 10 is provided with a hydraulic source 11 such as a plunger pump driven by a low speed diesel engine, and the lubricating oil boosted by the hydraulic source 11 is stored in an accumulator.
It is sent to 12 and pressure is accumulated.

An electromagnetic proportional relief valve 13 as a relief valve is branched and connected to the accumulator 12, and electrically holds the pressure in the accumulator 12 at a predetermined value,
The temperature compensation and the pressure compensation for the temperature variation and the pressure variation are performed.

A flow meter 14 as a flow rate detecting means is connected to the downstream side of the accumulator 12, and a cylinder liner 2 and a piston 3 of the low speed diesel engine 1 are connected via a solenoid valve 15 having a throttle or an orifice as an opening / closing valve. Lubricating oil is supplied to the sliding portion between them by an electric signal.

The detection signal from the flowmeter 14 is the electromagnetic proportional relief valve.
It is fed back to the solenoid valve 13 and the solenoid valve 15, and temperature and pressure are compensated by the solenoid proportional relief valve 13, while the opening time width of the solenoid valve 15 is controlled to control the discharge amount of the lubricating oil.

In such an intermittent lubrication type lubrication device 10, the accumulator
Solenoid valve with pressure inside 12 and throttle or orifice 15
The discharge amount is controlled by changing the pressure difference caused by opening and the opening time width of the solenoid valve 15.

Although not shown, the intermittent oil supply type lubricating device 10 includes
Control means is provided to control the operation timing (lubrication time) and operation time (open time width) of the solenoid valve 15 by obtaining information about the operating state of the low speed diesel engine 1, and
The operation of the electromagnetic proportional relief valve 13 is controlled based on the information of the change in the temperature and pressure of the lubricating oil to compensate for the temperature and pressure.

Supply of cylinder oil between the cylinder liner 2 and the piston 3 of the low speed diesel engine 1 by the intermittent lubrication type lubrication apparatus 10 thus compensated is performed as follows.

Cylinder oil pressurized and boosted by a hydraulic source 11 such as a plunger pump directly connected to the low speed diesel engine 1 is accumulated in an accumulator 12, and the pressure in the accumulator 12 is an electromagnetic proportional relief by a control signal from a control means. valve
By being output to 13, it is held at a predetermined value.

After the cylinder oil pressurized and boosted in this way is secured, at the optimum time according to the operating state of the low speed diesel engine 1, the control means outputs an open signal to the solenoid valve 15,
The solenoid valve 15 is opened.

Then, a pressure difference is generated between the upstream side and the downstream side of the solenoid valve 15 due to the throttle or orifice provided in the solenoid valve 15, cylinder oil flows, and lubrication is started in the low speed diesel engine 1 to close the solenoid valve 15. Lubrication is continued until a signal is output from the control means.

Then, by repeating this one cycle, the cylinder oil is intermittently supplied.

In this case, the amount of lubrication in one cycle is 12
The amount of oil injected into the low speed diesel engine 1 is determined by the pressure of the cylinder oil inside and the operating time of the solenoid valve 15.
It is detected by measuring as an average flow rate by 14, and is controlled by feeding back the detection result to the solenoid valve 15 and the solenoid proportional relief valve 13.

The oiling amount in this case is affected by the pressure change and temperature change (such as the pressure and temperature in the cylinder of the low-speed diesel engine 1) on the downstream side of the solenoid valve 15, but the detection signal of the flow meter 14 is changed to the electromagnetic proportional relief valve 13 By feeding back to, electric adjustment is performed, and pressure and temperature compensation are performed, so that a predetermined amount of oil is constantly lubricated.

Therefore, as compared with the conventional case where the discharge pressure waveform of the cylinder oil is determined by the profile of the cam directly driven by the low-speed diesel engine and the rotational speed of the cam, an electromagnetic wave that operates independently of the operating state of the low-speed diesel engine 1 is used. Since the lubrication state can be freely controlled by controlling the valve 15 and the lubrication is performed via the accumulator 12, it is possible to always maintain a constant pressure during lubrication, and constant pressure lubrication can be realized.

Further, the time constant at the time of boosting the cylinder oil is determined only by the characteristics of the solenoid valve 15 which are independent of the operating state of the low speed diesel engine such as the rotational speed of the cam and is always constant even when the operating state changes.

Although the above embodiment has been described with reference to the case of cylinder oil lubrication of a low speed diesel engine, the present invention is not limited to this and can be widely applied to the case where it is necessary to lubricate oil intermittently.

Also, instead of the solenoid valve that controls the amount of lubrication, a pilot type
You may use an ON-OFF valve.

Further, the hydraulic power source is not limited to the one driven by the low speed diesel engine, but may be a separately driven one.

Furthermore, the control system is not limited to the case where the control system is electrically configured, and may be a control system configured by using another working fluid such as a pneumatic type or a hydraulic type.

〔The invention's effect〕

As described above in detail with reference to the embodiment, according to the intermittent lubrication type lubricating apparatus of the present invention, the pressurized lubricating oil is put into the accumulator provided with the relief valve such as the electromagnetic proportional relief valve. Lubricating oil is supplied from the accumulator to the lubrication part via the flow rate detecting means and the on-off valve, and the supply amount detected by the flow rate detecting means is fed back to the relief valve to change the value of the pressure accumulated in the accumulator. In addition, it is possible to supply at a predetermined pressure without pressure fluctuation, and further, the detected supply amount is fed back to the on-off valve such as a solenoid valve to control the supply amount. Even if the discharge is started, the discharge pressure does not decrease, and constant pressure oil supply without pressure fluctuation can be performed.

Further, since the supply amount and the supply timing can be electrically controlled, for example, independently of the lubrication part by using an opening / closing valve such as a solenoid valve, it is easy to change the discharge pressure and the discharge period, and it is possible to diversify only by adjusting the control system. It is possible to obtain various discharge pressure waveforms, and optimal lubrication can be performed in all situations.

Furthermore, the time constant when the discharge pressure rises depends only on the response speed of the opening / closing valve such as the solenoid valve, and can be kept constant at all times.

Therefore, if the cylinder oil is used for a low speed diesel engine or the like, the lubrication timing can be varied and the lubrication amount control according to the operating state can be easily performed, and optimization can be easily realized.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment in which the intermittent lubrication type lubrication system of the present invention is applied to cylinder oil lubrication of a low speed diesel engine, and FIG. 2 is a schematic configuration diagram of a conventional intermittent lubrication type lubrication system. is there. 1: Low speed diesel engine, 2: Cylinder liner, 3: Piston, 10: Intermittent lubrication type lubricator, 11: Hydraulic power source, 12: Accumulator, 13: Electromagnetic proportional relief valve, 14: Flow meter, 15: Solenoid valve.

Claims (1)

[Claims] 1. A relief for changing accumulated pressure in an accumulator in which lubricating oil boosted by a hydraulic pressure source is accumulated in an intermittent lubrication type lubricating device for intermittently supplying a predetermined amount of lubricating oil to a lubrication section according to operating conditions. While the valve is provided, it is possible to supply to the lubrication part from an on-off valve having a throttling function that can change the supply time by changing the opening time width through the means for detecting the flow rate of lubricating oil from this accumulator. The control signal for controlling the pressure of the lubricating oil sent to the on-off valve is fed back to the relief valve by the detection signal of the above, and the control signal for changing the opening time width is fed back to the on-off valve by the detection signal of the flow rate detecting means. An intermittent lubrication type lubrication device, characterized in that a quantity control means is provided.