JP2004239157A - Lubricating device for diesel engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating device for a diesel engine capable of eliminating unnecessary consumption in injection lubrication of lubricating oil. <P>SOLUTION: This lubricating device is equipped with a passing time detection part 32 for detecting passing time of a piston ring part 7 to a lubrication port of a drive piston 6 of the diesel engine 2; a lubricating time detection part 33 for detecting lubricating time on the basis of a moving speed of a lubricating piston of a lubricator 11; a comparison part 34 for inputting and comparing the passing time and the lubricating time detected by the detection parts 32, 33; and a pressure command part 35 that outputs a pressure increasing/reducing command to a pressure control valve 14 for adjusting working pressure of working fluid supplied to the lubricator 11, such that the lubricating time corresponds to the passing time when the comparison part 42 judges that the passing time differs from the lubricating time. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a lubricating oil injection device for a diesel engine.
[0002]
[Prior art]
Generally, in a large marine diesel engine, lubricating oil is supplied to a piston ring portion of a driving piston from an oiling hole formed in a side wall portion of a cylinder chamber of the engine by an oiling device. Some are hydraulically driven.
[0003]
Conventionally, as shown in FIG. 3, this lubricating apparatus includes a lubricator 51 for supplying lubricating oil to a lubrication port, and a hydraulic pump 53 for supplying lubricating oil to the lubricator 51 via a lubricating oil supply pipe 52. And an electromagnetic on-off valve 54 provided at a location where the lubricating oil supply pipe 52 is connected to the lubricator 51 side, and a control device 55 for controlling the electromagnetic on-off valve 54 in accordance with the rotation speed of the engine. (See Patent Document 1).
[0004]
The lubricator 51 mainly includes a block body 61 in which an operation cylinder chamber 61a and an oil cylinder chamber 61b are formed, a lubrication piston 62 movably disposed in both of the cylinder chambers 61a and 61b. A proximity sensor 63 for detecting the lubricating piston 62 is disposed on a side wall of the operating cylinder chamber 61a for guiding the operating piston portion 62a of the lubricating piston 62.
[0005]
According to this lubrication device, the electromagnetic on-off valve 54 is opened and closed via the control device 55 in accordance with the rotation speed of the engine, and the lubrication piston 62 is operated. That is, the lubricating oil introduced into the lubrication cylinder chamber 61b is extruded from the discharge hole 61c formed on the other end side to the lubrication port of the engine, and injected into the piston ring portion.
[0006]
At the time of the lubrication, the position of the working piston portion 62a is detected by the proximity sensor 63, and a detection signal thereof is input to the control device 55, where it is compared with the rotation speed of the engine. The electromagnetic opening / closing valve 54 is controlled so as not to shift.
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-121931
[Problems to be solved by the invention]
However, according to the above conventional configuration, the lubrication start timing is controlled according to the engine rotation speed, but the lubrication time is not controlled, so that when the engine rotation speed increases, In some cases, the lubricating oil is injected even after the piston ring has passed, and the lubricating oil is wastefully consumed and uneconomical.
[0009]
Therefore, an object of the present invention is to provide a lubricating device for a diesel engine that can eliminate wasteful consumption when lubricating oil is supplied.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a lubricating device for a diesel engine according to the present invention supplies lubricating oil to a lubricating port formed on a side wall of a cylinder chamber of the diesel engine to supply lubricating oil from the lubricating port to a piston ring portion of a driving piston. For lubricating,
A lubricator for supplying lubricating oil to the lubrication port,
A lubricating oil supply path connected to a hydraulic pump and provided with a pressure regulator on the way to supply lubricating oil to the lubricator;
A control valve provided in the lubricating oil supply path and operating the lubricating piston provided in the lubricator in synchronization with the rotation of the engine to discharge the lubricating oil from the lubrication port;
A passage time detection unit that detects a passage time of the piston ring unit with respect to the lubrication port based on a rotation speed of the diesel engine,
An oiling time detecting unit that detects an oiling time based on a moving speed of an oiling piston in an oiler,
A comparison unit that performs a comparison by inputting the passage time and the lubrication time detected by the two detection units,
A pressure command unit that outputs a pressure increase or pressure reduction command to the pressure regulator so that when the transit time and the lubrication time are determined to be different by the comparison unit, the lubrication time matches the transit time. It was done.
[0011]
The lubricating device for a diesel engine according to claim 2 is the lubricating device according to claim 1,
When detecting the moving speed of the lubricating piston, detection signals from two proximity sensors provided at a predetermined distance in a moving passage of the lubricating piston provided in the lubricator are used.
[0012]
According to the above configuration, the lubricating time in the lubricator is determined, and the lubricating time is compared with the passage time of the piston ring portion, and the operating pressure in the lubricator is set to be the same or almost the same. Since the adjustment is performed, even if the rotation speed increases, the lubricating oil is always injected when passing through the piston ring portion, so that wasteful consumption of the lubricating oil can be eliminated.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a lubricating device in a diesel engine according to an embodiment of the present invention will be described with reference to FIGS.
[0014]
As shown in FIG. 1, the lubricating device 1 is formed at a plurality of positions on a side wall portion (a side wall portion of a cylinder chamber) of a cylinder block 3 of a marine diesel engine 2 (for example, formed at four positions at equal intervals). This is for supplying lubricating oil to the lubrication port 4 and injecting it into the cylinder chamber 5 from the lubrication port 4. The lubricator 11 supplies lubricating oil to the lubrication port 4, and a hydraulic pump. A lubricating oil supply pipe (lubricating oil supply path) 13 which is connected to the lubricating oil supply 11 and which supplies lubricating oil to the lubricator 11. A control valve (an example of a pressure regulator) 14 and an electromagnetic on-off valve (an example of a control valve) 15; a rotation speed detector 16 for detecting the rotation speed of the diesel engine 2; Was And a rotation speed and lubricators lubrication piston (described later) provided in the 11-side control unit 17 for controlling the pressure regulating valve 14 based on the movement speed of the.
[0015]
As shown in FIG. 2, the lubricator 11 has an introduction hole 21 a for introducing lubricating oil at one end and a supply hole 21 b for supplying lubricating oil as hydraulic oil, and discharges lubricating oil to the other end. For example, a cylindrical block body 21 having a plurality of (four provided in accordance with the lubrication ports) discharge holes 21c, and one end and the other end of the block body 21 (hereinafter referred to as an axis center). The lubricating piston 23 is disposed movably in the axial direction in the formed cylinder chamber 22 for performing lubrication, and pushes out the lubricating oil introduced into the cylinder chamber 22 from the discharge hole 21c. It is composed of The supply hole 21b is connected to the discharge port of the solenoid on-off valve 15, while the introduction hole 21a is connected to the oil return pipe side of the solenoid on-off valve 15 so that lubricating oil can be always introduced. ing. In FIG. 2, the introduction hole 21a is shown as being provided integrally with the manifold in which the electromagnetic on-off valve 15 is built. However, the introduction hole 21a may of course be connected in the middle of the return pipe.
[0016]
The cylinder chamber 22 will be described in detail. In order from one end side to the other end side, a small-diameter hole portion (also referred to as an actuation cylinder chamber) 22a having a circular cross section communicated with the supply hole 21b, A large-diameter hole portion (for lubrication) having a circular cross section having the other end communicating with the small-diameter hole portion 22a and the introduction hole 21a and having the other end communicating with the discharge holes 21c and having a larger outer diameter than the small-diameter hole portion 22a. 22b).
[0017]
The lubricating piston 23 is connected to a piston portion 23a slidably disposed in the small-diameter hole portion 22a and to the other end of the piston portion 23a via a smaller-diameter rod-like portion 23b. A circular plate portion 23c movably arranged in the inside 22b, and a plurality of circular plate portions 23c protruding in the axial direction from the other end surface side of the circular plate portion 23c and having the distal end side inserted into each discharge hole 21c ( For example, four (4) rod-shaped extruded portions (also referred to as plunger portions) 23d.
[0018]
When the lubricating oil is supplied to the supply hole 21b, the lubricating piston 23 is pushed toward the other end, so that the lubricating oil guided from the introduction hole 21a to the discharge hole 21c through the large-diameter hole portion 22b is supplied to the lubrication hole 4b. Will be extruded. The lubricating piston 23 moved to the other end side is returned to the original one end side by a compression coil spring 24 which is an urging member disposed in the large-diameter hole 22b and between the circular plate 23c. Is restored.
[0019]
In order to adjust the amount of movement of the lubrication piston 23 to the other end, a guide hole 21d having a predetermined diameter is formed in the other end of the block body 21 and a circular plate portion of the piston 23 is formed. A bar-shaped guide portion 23e inserted into the guide hole 21d protrudes from the other end surface side of the guide hole 23c. Further, on the block body 21 side, the rod-shaped guide portion 23e is inserted from the outside into the guide hole 21d to restrict the movement of the bar-shaped guide portion 23e. A stopper 25 is provided. A check valve 26 is provided in each of the discharge holes 21c.
[0020]
Next, the control device 17 will be described.
The control device 17 controls the lubricator so that the passage time of the piston ring portion 7 of the driving piston 6 with respect to the lubrication port 4 from the rotation speed of the diesel engine 2 and the lubrication time of the lubricator 11 are the same or almost the same. The operation pressure of the lubrication piston 23 at 11 is adjusted.
[0021]
That is, a pair of proximity sensors (for example, magnetic sensors) 31 (31A, 31B) capable of detecting the piston portion 23a of the lubrication piston 23 are provided on the side wall portion of the small-diameter hole portion 22a of the block body 21 in the axial direction. Are provided at a predetermined distance from each other, and detection signals from these two proximity sensors 31 are input to the control device 17.
[0022]
On the other hand, the control device 17 receives a rotation speed signal detected by the engine rotation speed detector 16 and calculates a passage time of the piston ring portion 7 to the lubrication port 4 to obtain a passage time. A lubrication time detecting unit (also referred to as lubrication time calculation unit) 33 which receives the detection signals from the proximity sensors 31 and obtains the movement time of the stroke of the lubrication piston 23 in the lubricator 11, that is, the lubrication time. A comparison unit 34 for inputting the lubrication time obtained by the lubrication time detection unit 33 and the transit time obtained by the transit time detection unit 32 and comparing which is shorter (or longer); By inputting the comparison result obtained by the comparison unit 34, the lubrication time and the transit time are the same or almost the same (exactly, the lubrication time is slightly shorter than the transit time. As a preferable), and the pressure command unit 35 that outputs a pressure command to the pressure regulating valve 14 are provided.
[0023]
Specifically, when the rotation speed of the engine is high and the transit time is shorter than the lubrication time, the pressure increasing valve 21 increases the operating pressure of the lubrication piston 23 in the lubricator 11 with respect to the pressure control valve 14. A command is output, and if the rotation speed of the engine is slower and the transit time is longer than the lubrication time, a pressure reduction command for lowering the operating pressure is output.
[0024]
That is, since the lubrication time is controlled according to the rotation speed of the engine, lubrication after passing through the piston ring portion, which occurs when the lubrication time does not change, is eliminated as in the related art, and wasteful consumption of lubricating oil is suppressed. be able to. More specifically, lubrication is normally performed once every several revolutions of the crankshaft. For example, once every four revolutions, lubrication is performed once every five revolutions. And the number of times of lubricating oil injection can be reduced.
[0025]
The controller 17 also controls the electromagnetic on-off valve 15, and determines the lubrication start time by detecting the rotational position of the diesel engine 2, that is, the rotational position of the crankshaft. As described above, lubrication is performed once every several revolutions of the crankshaft. The detection of the rotational position may be performed based on a signal from the rotational speed detector 16, for example, or a rotational position detector may be separately provided.
[0026]
In addition, a rotational position detector such as a rotary encoder that detects the rotational position of the crankshaft is provided to detect the rotational speed of the diesel engine, and the rotational position detected by the rotational position detector is divided by time. May be used to detect the rotation speed. In this case, the detection position from the rotation position detector may be input to the control device, and the rotation speed may be determined here.
[0027]
Further, in the above description, the proximity sensor 31 is arranged at a predetermined distance, the moving speed of the lubricating piston 23 is determined from these detection signals, and then the lubricating time is determined from the moving speed. For example, the lubrication time may be directly detected by disposing the two proximity sensors 31 at the lubrication start position and the lubrication end position of the lubrication piston 23.
[0028]
【The invention's effect】
As described above, according to the configuration of the lubricating device in the diesel engine of the present invention, the lubricating time in the lubricator is determined, and the lubricating time is compared with the transit time of the piston ring portion. The operating pressure of the lubricator is adjusted so that the lubricating oil is always injected when passing through the piston ring, even if the rotational speed increases, so that wasteful consumption of lubricating oil is reduced. Can be eliminated. For example, oiling is performed once every four rotations of the crankshaft, but only once every five rotations, and the number of times of lubricating oil injection can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a lubricating device in a diesel engine according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an oil injector in the oil injector.
FIG. 3 is a cross-sectional view of a main part of a conventional lubrication device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lubricating device 2 Diesel engine 3 Cylinder block 4 Lubrication port 6 Driving piston 7 Piston ring part 11 Lubricator 12 Hydraulic pump 13 Lubricating oil supply pipe 14 Pressure control valve 15 Electromagnetic on-off valve 16 Rotational position detector 17 Control device 21 Block body 21a introduction hole 21b supply hole 21c discharge hole 21d guide hole 22 lubrication cylinder chamber 22a small diameter hole 22b large diameter hole 23 lubrication piston 23a piston 23b rod 23c circular plate 23d rod extrusion 23e rod guide 24 Stopper 31 Proximity sensor 32 Passage time detection unit 33 Lubrication time detection unit 34 Comparison unit 35 Pressure command unit

Claims (2)

An oiling device for supplying lubricating oil to an oiling hole formed in a cylinder chamber side wall portion of a diesel engine to lubricate a piston ring portion of a driving piston from the oiling hole,
A lubricator for supplying lubricating oil to the lubrication port,
A lubricating oil supply path connected to a hydraulic pump and provided with a pressure regulator on the way to supply lubricating oil to the lubricator;
A control valve provided in the lubricating oil supply path and operating the lubricating piston provided in the lubricator in synchronization with the rotation of the engine to discharge the lubricating oil from the lubrication port;
A passage time detection unit that detects a passage time of the piston ring unit with respect to the lubrication port based on a rotation speed of the diesel engine,
An oiling time detecting unit that detects an oiling time based on a moving speed of an oiling piston in an oiler,
A comparison unit that performs a comparison by inputting the passage time and the lubrication time detected by the two detection units,
A pressure command unit that outputs a pressure increase or pressure reduction command to the pressure regulator so that when the transit time and the lubrication time are determined to be different by the comparison unit, the lubrication time matches the transit time. A lubrication device for a diesel engine. When detecting the moving speed of the lubricating piston, detection signals from two proximity sensors provided at a predetermined distance in a moving passage of the lubricating piston provided in the lubricator are used. Item 2. An oiling device for a diesel engine according to Item 1.

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