KR100770526B1 - Diesel engine with swing arm in fuel pump - Google Patents

Abstract

A diesel engine is provided to adjust fuel injection timing in accordance with the forward and reverse rotation of the engine through the rotation of a swing cam. A diesel engine includes a plurality of fuel pump assemblies. Each assembly includes a cam shaft(101), a fuel cam(100), a swing arm(204), and a fuel pump(400). The cam shaft is extended from one side of an engine crank shaft. The fuel cam is mounted on the cam shaft, and drives the fuel pump mounted on a cylinder. The fuel pump rotates by the cam shaft. The swing arm interconnects the fuel cam and the fuel pump. The swing arm has one side with a roller(201) which reciprocates in a vertical direction in correspondence to the curvature of the fuel camp and a connecting arm(210) for connecting the roller and a lower end of the fuel pump, and the other side with a swing cam(205) for moving the position of the roller by rotating an eccentric cam when the engine rotates in a reverse direction or if necessary. The fuel pump is driven in accordance with the vertical reciprocation of the swing arm.

Description

Diesel engine with reverse fuel injection by eccentric shaft

1 is a conceptual diagram showing a preferred embodiment of the present invention,

Figure 2 is an exemplary cross-sectional view showing an example showing the position of the eccentric shaft during the forward and reverse rotation of the engine according to the present invention,

3 is an exemplary view showing the operation of the fuel quality setting system according to the present invention,

4 is an exemplary view showing the operation of timing control according to the present invention;

5 is an exemplary view illustrating the operation of an over stopper according to the present invention;

6 is a configuration diagram in the form of the top dead center and the bottom dead center of the engine normal rotation and reverse rotation of the present invention,

7 is a perspective view showing the shape of a swing cam schematically.

<Description of the symbols for the main parts of the drawings>

100: fuel cam 101: cam shaft

201: Roller 202: Pivot Pin

(203): Guide supporter

204: swing arm

205 : Swing Cam

(210): connecting arm

(230): Anna screw

(231): external thread

(232): Lever

(233): Overload limit

400: integral part of the fuel pump

The present invention relates to a diesel engine having an inverted fuel injection device by an eccentric shaft, and more particularly, a swing arm having a swing cam between a fuel pump and a fuel cam of a large marine engine. The present invention provides a diesel engine that adjusts the injection point of the pump according to the operation of the cam and efficiently has the injection point of the fuel pump corresponding to the reverse rotation even in the reverse rotation of the engine.

In general, direct reversible engines such as large low-speed diesel engines need to be added to control the injection timing of fuel corresponding to reverse rotation when the engine is reversed because of the characteristic that fuel injection starts before top dead center. In general, there is a need for a device corresponding to reversal of the engine capable of adjusting the fuel injection timing to the cam or fuel pump.

As a method for adjusting the fuel injection time corresponding to the reverse rotation of the engine in the conventional large-speed low-speed diesel engine, it is fixed to the lower end of the fuel pump for converting the rotational movement of the cam into a straight up and down movement to adjust the starting point of the reverse rotation injection There are a method of moving the position of the roller (MAN-B & W method) and a method of rotating the cam itself by a hydraulic vane method (Wartsila-Sulzer). However, both methods can control only the injection timing corresponding to reverse rotation and forward rotation, so it is difficult to control individual timing of FQS and each pump. Especially, in case of Wartsila-Sulzer system, the cam itself is rotated. .

An object of the present invention for solving the above problems is not only to adjust the fuel injection timing of the fuel pump corresponding to the engine reversal but also to have a more efficient fuel injection device capable of fine adjustment of the fuel injection timing during the forward rotation of the engine To provide an institution.

The present invention, which achieves the object as described above and the problem for eliminating the conventional drawbacks, in a mechanical diesel engine for fuel injection to the cylinder through a camshaft, the camshaft is extended to one side of the engine crankshaft driven and;

A fuel cam having a heart shape and installed on the cam shaft to be rotated by the cam shaft to drive fuel pumps installed in the cylinder;

One side is composed of a roller and a connecting arm connecting the lower end of the fuel pump and the roller to the upper and lower reciprocating motion in response to the bending of the fuel cam to drive the fuel pump by connecting the fuel cam and the fuel pump, the other side has an eccentric shaft A swing arm having a swing cam which is fixed to rotate the eccentric shaft when the engine is reversely rotated or, if necessary, to move the position of the roller;

And a fuel pump assembly composed of a plurality of fuel pumps driven in response to vertical swing reciprocation of the swing arm.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a cross-sectional view showing a preferred embodiment of the present invention, Figure 2 is a state at the highest point and the lowest point of each fuel cam 100 at the time of the engine forward (Ahead) and reverse rotation (Astern) according to the present invention Is a cross-sectional view showing

Specifically, as shown in FIGS. 1 and 2, a fuel injection pump having a swing cam according to a preferred embodiment includes: a cam shaft 101 extended and driven to one side of an engine crankshaft; A fuel cam (100) installed on the cam shaft (101) and rotating by the cam shaft (101) to drive the fuel pump by vertically moving the roller (201); A roller 201 installed to be interlocked by the fuel cams to change the rotational movement of the fuel cam 100 to a linear vertical movement in response to the bending of the fuel cam; Characterized in that composed of a fuel pump 400 for pumping the fuel through the vertical movement of the roller 201.

A swing arm 203 serves to connect the fuel cam 100 and the fuel pump 400 to one side in response to the bending of the fuel cam 100 so as to vertically reciprocate the rotational movement of the fuel cam 100. It has a roller 201 for converting, and a connecting arm 210 for connecting the roller 201 and the lower end of the fuel pump,

The other side is fixed with an eccentric shaft, and consists of a swing cam (swing cam-205) which can move the position of the roller by rotating the eccentric shaft when the engine rotates in reverse or if necessary.

3 is an exemplary view showing the operation of the fuel quality setting system according to the present invention, by adjusting the outer screw 231 of the double screw through the lever 232 to the fuel in the fuel pump of all cylinders Demonstrates the operation of the fuel quality setting to control injection timing.

The lever 232 is provided to move equally for each fuel injection device provided for each cylinder. As the lever is rotated, the double screw moves slightly downwards or upwards to press one support of the swing cam 205. The swing cam 205 is rotated by the eccentric shaft as much as the swing cam 205 is pressed. The swing arm 204 moves slightly from side to side by the amount of rotation, and consequently, the position of the roller can be moved from side to side, thereby implementing an FQS system that can accelerate or slow down the fuel injection timing of all cylinders by the same interval.

To supplement, the principle of operation of the fuel quality setting (FQS) and the individual pump timing is the same, but the FQS is the movement of all cylinders in conjunction, and each pump timing controls the individual fuel injection values. It is a function that can. For example, "I'll slow down the fuel injection angle for all cylinders by 1 degree (FQS) and cylinder 3 by 2 degrees (Each pump timing)."

Figure 4 is an exemplary view showing the operation of the timing control (Timing control) according to the present invention, by adjusting the inner screw 230 of the screw consisting of a double screw with the fuel quality setting (Fuel quality setting) of FIG. Demonstrates the operation of individual pump timing to control the fuel injection timing of individual fuel pumps.

The double screw can be adjusted separately for each fuel injection system and used in the required cylinders during engine operation. If it is necessary to adjust the fuel injection timing of a specific cylinder, the inner screw 230 of the fuel injection system is rotated, and one support of the swing cam 205 is pressed. As a result of the FQS system, the position of the roller is changed left and right as a result. Fuel injection timing can be adjusted for each cylinder.

Figure 5 is an exemplary view showing the operation of the over stopper according to the present invention, showing the operating principle of the overload limit 233 to prevent the eccentric shaft shaking during forward and reverse rotation. The up-and-down movement of the roller by rotation has a considerable load. When there is no such overload limit, the swing cam 205 rotates arbitrarily. As a result, the position of the roller is changed and the fuel injection timing changes arbitrarily. It is a system to prevent this because it may not be able to exhibit performance.

6 is a configuration diagram of the top dead center and the bottom dead center of the engine normal rotation and reverse rotation of the present invention. Figure 6 is a state at the highest point and the lowest point of each fuel cam at the engine normal rotation and reverse rotation according to the present invention. It is sectional drawing which shows. According to this drawing, since the angles of the highest and lowest points of the forward and reverse rotations are changed, the fuel injection timing is also corresponding to the reverse rotation of the engine.

Referring to the effect of the present invention configured as described in connection with the accompanying drawings as follows.

As shown in FIGS. 1 and 2, as the cam shaft 101 extended and rotated on the diesel engine crank shaft rotates, the fuel cam 100 installed on the cam shaft 101 operates as the engine operates. Will rotate.

Therefore, the roller 201 rotating in contact with the fuel cam 100 has a vertical reciprocating motion as in the forward or reverse rotation of FIG. 2 with the eccentric shaft 205 fixed. Is delivered to the lower end of the fuel pump.

When the fuel pump pumps fuel and sends it to the fuel injector while moving up and down, the fuel injector injects fuel into the cylinder of the engine when a certain pressure is reached.

In addition, when the engine rotates in reverse, the eccentric shaft (the eccentric shaft refers to the '+' mark of the swing cam in the drawing. When the swing cam is rotated around this axis, the swing arm moves left and right as the swing cam rotates.) When rotating the swing cam (swing cam-204) around the roller of the swing arm (swing arm 204) is positioned differently than when the Ahead, as shown in Figure 2 Astern 2 through the rotation of the fuel cam 100 Since the time points corresponding to the highest and lowest points are different, it is possible to adjust the fuel injection timing according to the reverse rotation of the cam shaft at the reverse rotation of the engine.

Actually, all marine engines have a device for adjusting the fuel injection timing during forward and reverse rotation of the engine (described above in the case of B & W and Sulzer). It not only degrades, but also causes serious smoke problems. The position of the bottom dead center and the top dead center of FIG. 6 shows that the angle of the fuel cam is different. If the fuel injection starts when the roller reaches the highest point, the roller at the forward and reverse rotation of the engine Can be adjusted as shown in Fig. 6 can have a fuel injection timing corresponding to each)

To prevent movement of the swing cam 204 during reverse rotation of the engine, an overload limit 233 is provided to limit the rotation of the fuel cam 100 and the movement of the roller 201 as it moves.

3, the dual screw (FUEL QUALITY SETTING) and the timing control (Timing control) (double thread outer thread 231 and the inner thread that is equally adjusted in all cylinders through the lever 232) (To say 230 together) is provided.

The outer thread 231 of the double screw is linked to all cylinders of the engine by the fuel quality setting system, and thus the injection time of all the cylinders can be moved equally.

The principle of operation is that as the outer thread rotates by turning the lever 232 as shown in FIG. 3, the swing cam 205 supporting the swing cam 205 moves up or down, and thus swing cam, 205 is rotated by pressing and as the swing cam rotates, the roller moves little by little to the left or right to adjust the position at which the highest and lowest points of the fuel cam 100 are reached so that the injection timing can be adjusted. .

In addition, the lever is a wrench-like device that is integrated with the external thread and is equally connected to all fuel injection systems of the engine. Therefore, when the lever is turned, the outer thread rotates and moves up and down. At this time, the inner thread is fixed in the outer thread, so the outer thread supporting the actual swing cam moves up and down as much as the outer thread moves. When the outer screw is fixed and only the inner screw is turned, only the inner screw of the individual fuel injection system moves up and down to rotate the swing cam.

If the manual adjustment like this does not require a separate device such as a hydraulic system can achieve the cost saving and the simplicity of the structure, but do not have to be manually.

In such a system, all cylinders are interlocked so that the same adjustment is possible for all cylinders. The double screw Anna screw 230 is a system capable of pump timing control.

The system can be adjusted for each individual cylinder of the engine.The principle of operation is the swing cam by moving the inner screw up and down by rotating only the inner screw following the fuel quality setting adjusted by the outer screw 231. Press and rotate to move the roller to the left or right to allow adjustment of the injection timing of each cylinder, as with the FUEL QUALITY SETTING system.

7 is a perspective view showing a schematic shape of a swing cam. As shown in the figure, the center of the swing cam in the swing cam is cross-shaped, and if the part contacting the inner thread is indicated by a small green circle, a small green circle is shown. Depending on the size of the pressing part, the swing cam rotates around the cross shape and moves to the left or right. Therefore, the swing arm and the roller linked to the swing cam moves to the left or right according to the movement of the swing cam.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The present invention as described above can simplify the injection timing adjustment for the forward and reverse rotation of the engine through the rotation of the swing cam with the eccentric shaft roller connecting the fuel cam and the fuel pump, the simple structure of the double screw Through the fuel quality setting and each pump timing adjustment system, it is a useful invention that increases the reliability of the engine and provides the simplicity of structure and the convenience of maintenance. It is an invention.

Claims (4)

In the diesel engine that injects fuel into the engine cylinder by operating the fuel pump through the rotation of the fuel cam, A cam shaft extended and formed to one side of the engine crank shaft; A fuel cam having a heart shape and installed on the cam shaft to be rotated by the cam shaft to drive fuel pumps installed in the cylinder; One side is composed of a roller and a connecting arm connecting the lower end of the fuel pump and the roller to the upper and lower reciprocating motion in response to the bending of the fuel cam to drive the fuel pump by connecting the fuel cam and the fuel pump, the other side has an eccentric shaft A swing arm fixed with a swing cam which can be moved at the time of reverse rotation of the engine or as necessary to rotate the eccentric shaft to move the position of the roller; A fuel pump driven in response to a vertical reciprocation of the swing arm; Diesel engine having a reverse fuel injection device by the eccentric shaft, characterized in that the fuel pump assembly (Assembly) consisting of a plurality. The method of claim 1, The roller is installed on the swing arm (swing arm) is configured to adjust the injection point by moving the swing cam (swing cam) supported by any one of the double screw consisting of the outer thread and the inner screw to the left or right, The outer thread is installed to rotate the same for all cylinders so that the fuel quality setting can be made. Anna is a diesel engine having an inverted fuel injection value by an eccentric shaft, characterized in that the pump timing control is configured for each fuel pump. The method according to claim 1 or 2, And an overload limit that is fixedly supported after the swing arm is moved. The method according to claim 1 or 2, The outer thread is a diesel engine having a reverse fuel injection value by the eccentric shaft, characterized in that the rotation is controlled by the lever.

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