JP3138521B2 - Lubrication device for piston member of fuel injection pump - Google Patents

Abstract

An improved lubrication arrangement for a piston member (2) arranged to be reciprocatingly movable in a cylinder element (1) of an injection pump for fuel or the like pressure medium, wherein lubricant is supplied under pressure into a lubrication groove (5) arranged in the cylinder element (1) and encircling the piston member (2). The flow-through of the lubricant is effected by providing the cylinder element (1) with at least one channel (6) extending in the longitudinal direction of the cylinder element, said channel (6) being connected with said lubrication groove (5) for leading lubricant continuously into another position on the mantle surface of the piston member (2) at a distance from said lubrication groove (5) further to be recovered and for possible recirculation. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an apparatus according to the preamble of claim 1 for lubricating a piston member of an injection pump for injection of a pressure medium such as fuel.

[0002]

2. Description of the Related Art The supply of fuel to a cylinder of an internal combustion engine by an injection pump is performed under high pressure. For this reason,
The gap between the cylinder element of the pump and the sliding surface of the piston member is very tight, only a few thousandths of a millimeter, so that little fuel can leak through the gap into the interior of the pump. In general, the purpose of the lubrication system for the piston member of the injection pump is to provide the piston member with lubrication as well as to make the gap tighter and thus prevent fuel leakage there. In addition, the lubrication is
Provides protection and purification.

In known lubrication systems, lubricating oil is introduced into the gap using pressure. However, due to the narrow gap, the oil flow is slow, even if the oil delivery pressure is increased. Further, the lubricating oil is sufficiently warmed in the narrow gaps and thus exceeds the desired value of about 110 ° C. to 115 ° C. for mineral oils, thereby providing sufficient oil, especially when heavy oil is used as fuel in large diesel engines. The warmed lubricating oil reacts more easily with the fuel to form sticky lacquer and carbon deposits, which makes it more difficult for the piston member to move through the cylinder, and the lubrication oil delivery. Even ducts can become completely obstructed. It should be appreciated that a large diesel engine as referred to herein is one that is applicable as a main propulsion engine or an auxiliary engine for a ship in a diesel heating power plant or the like.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new and improved lubrication system for piston members of an injection pump that substantially eliminates the drawbacks present in known systems, especially associated with heavy duty diesel engines using heavy oil as fuel. It is to be.

[0005] The object of the invention is achieved in the embodiments specified in claim 1 and in the dependent claims. The lubrication system according to the present invention effectively generates a lubricating oil flow .
Rukoto can, thereby retaining leave the temperature of the lubricating oil is low
As a result , impurities can be more effectively removed. It improved been effective <br/> fruits, also be obtained at a pressure lower than in the known systems
Can be .

[0006] Lubricating oil flows in the longitudinal direction of the cylinder element.
Channel extending to the position for supplying lubricating oil.
By placing it at least on the opposite side of the Linda element
It can be more effective .

An advantageous solution in terms of lubrication and cleaning is that the cylinder element has a separate lubrication channel surrounding the piston member and arranged at a predetermined distance from said lubricating oil, said lubrication channel being a cylinder element. Is obtained when arranged in relation to the outer surface of the piston member in such a way as to be connected to said longitudinally extending channels for effective lubrication. The lubrication channel may be coupled to the outer surface of the piston member via one or several nozzle orifices or the like to achieve splash lubrication in the lower portion of the piston.

Further, lubricating oil is piped from the lubricating channel.
A collection reservoir or corresponding moisture along the outer surface of the stone member
In order to guide freely into the lubricating oil collection space,
The lubrication oil recovery space between the piston member and the lubrication channel
It is advisable to arrange a sufficient gap extending to the position of the handle .

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes a cylinder element of a fuel injection pump surrounding a movable piston member 2 reciprocating. Although the present invention does not relate to the actual delivery of fuel by the injection pump, the delivery may be made in some known manner by utilizing structural solutions as is well known. Accordingly, these structures are not shown in detail in the drawings and are not described herein.

As a result of the normal operation of the injection pump, fuel is transferred away from the fuel injection chamber due to high pressure to the inner part of the pump, ie downwardly in FIG. Tend to flow into the gap 3 between them. Especially in large diesel engines, when heavy oil is used as fuel, the mixture of fuel and oil used to lubricate the gap 3 tends to form carbon deposits or become sticky lacquers due to high temperatures. There is. According to the present invention, prevention of this phenomenon is achieved by making the lubricating oil flow effective, whereby the temperature of the oil can be reduced and the impurities that produce carbon deposits can be removed. is there.

According to FIG. 1, the lubricating oil is
Are guided along the channel 4 to a lubrication groove 5 arranged in the cylinder element 1. The lubricating oil is guided into a lubricating channel 7 along a channel 6 extending longitudinally of the cylinder element from a lubricating groove 5, which also surrounds the piston member 2 and is remote from the pressure chamber of the pump. At a predetermined distance from the lubrication groove 5. Several nozzle orifices 8 are provided around the lubrication channel 7, which channel 7 is connected to the outer surface of the piston member 2 via said orifice 8. By means of the nozzle orifice 8, the cross-sectional area of the orifice 8 is preferably limited compared to the channel 7, and the outer surface is under splash lubrication, so that a correspondingly more effective lubricating oil Spraying effectively lubricates and removes impurities forward. At the same time, the nozzle orifices 8 allow the lubricating oil to sufficiently act on the outer surface of the piston member and serve to limit the excessive flow of the lubricating oil through the lubrication groove 5.

[0013] The lubricating oil passes through the gap 9 after the nozzle orifice 8 is led into the space 10 inside the pump, can be recovered from the space, Ru is recycled after purification.

In FIG. 2, circulation of the lubricating oil according to the embodiment of FIG. 1 is illustrated by showing only the lubricating oil channels and flows.

In principle, the nozzle orifice 8 may be formed in a different manner, but the circular holes are rather optimally shaped to also remove particles with large impurities. For example, instead of a hole, one or several slots surrounding the piston member can be implemented as well, but the width of the slot at the flow rate corresponding to the flow rate through a nozzle orifice having a particular diameter, is of interest. Significantly smaller than the diameter, this allows the slots to enter by particles of impurities having only a correspondingly small cross section.

The cylinder element 1 with respect to the feed channel 4
The arrangement of the channel 6 on the opposite side provides a favorable oil flow and lubrication around the outer surface of the piston member 2. However, the arrangement of the channels 6 may be changed as needed. It is also feasible to provide several channels 6 with several feed channels 4 in the cylinder element 1, when only the dimensions of the channels are to be taken into account to provide suitable circulation and lubrication.

The invention is not limited to the embodiments shown, but some modifications can be made within the scope of the appended claims.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lubricating device of the present invention for a piston member of an injection pump.

FIG. 2 is a schematic diagram of the circulation of lubricating oil in a cylinder element of a pump according to the apparatus of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder element 2 Piston member 5 Lubrication groove 6 Channel 7 Lubrication channel 8 Nozzle orifice 9 Gap 10 Space

Claims (5)

(57) [Claims] 1. A lubrication system for the piston member (2) arranged to reciprocate in a cylinder element (1) of the pressure medium for the injection pump such as a fuel, the piston member
(2) surrounding the cylinder element (1)
Lubrication groove configured to be supplied with pressurized lubricant
(5) outside the piston member (2) facing the lubrication groove
A lubrication groove (5) for continuously guiding the lubricant to a position on the surface to be coated;
To further collect and recirculate lubricant,
Piston member at a predetermined distance from lubrication groove (5)
(2) Continuously guide the lubricant to other positions on the outer surface
The cylinder element connected to the lubrication groove (5)
(1) The lubrication system is provided so as to extend in the longitudinal direction.
At least one channel (6) through which the agent is distributed
A lubricating device comprising: 2. A lubricating device according to claim 1, wherein said channel extending in the longitudinal direction of the cylinder element (6), said cylinder element (1) at least approximately in pairs to a position for supplying the lubricating oil Lubrication device located on the opposite side. 3. The lubricating device according to claim 1, wherein said cylinder element (1) is provided with a predetermined distance from said lubrication groove (5).
Arranged at a distance has a separate lubrication channel (7) surrounding said piston member (2),該潤sliding channel (7) is coupled to the channel (6) extending in the longitudinal direction of the cylinder element, wherein Outside the piston member (2)
Arranged to communicate with the other position on the surface to perform lubrication
It has been that the lubricating device. 4. The lubricating device according to claim 3, wherein the lubricating channel (7) is coupled to the outer surface of the piston member (2) via one or several nozzle orifices (8). Lubrication device. 5. The lubricating apparatus according to claim 3, wherein the cylinder element (1) or the cylinder element (1) is provided.
Lubricant, which is arranged to couple to the cylinder element (1)
Space (10) for accommodating the lubricant and the lubricant
From the pipe (7) to the space (10) for collecting the lubricant.
So that it can be freely guided along the outer surface of the stone member (2).
Between the cylinder element (1) and the piston member (2)
From the space (10) arranged for collecting the lubricant,
A gap (9) extending to the position of the slip channel (7).
Lubricating device for.