JPH0221533Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications This invention relates to a fuel injection device.

Background technology, objectives and issues Conventionally, in-line fuel injection pumps and mechanical
In a fuel injection device for a vehicle diesel engine that includes a governor, a refueling port is formed in a side wall of the pump casing and opens into a cam chamber of the pump casing above the camshaft of the fuel injection pump. , and the camshaft extending through the pump casing and into the governor casing is rotatably supported in the cam chamber on front and rear bearings attached to the pump casing. , the lubricating oil supplied to the fuel injection pump and the mechanical governor first flows into the cam chamber from the oil fill port, then the lubricating oil flows through the bearing behind the cam chamber, and further, It flows into the governor chamber of the governor casing.

Therefore, when the vehicle goes up or down a hill, the vehicle body is tilted in the longitudinal direction, and accordingly, when the governor chamber is located above the cam chamber, the lubricating oil in the governor chamber is This caused the oil to flow back through the other bearing and back into the cam chamber, leaving the governor chamber without oil, potentially causing wear in the governor mechanism. Furthermore, when the cam chamber is located above the governor chamber, the lubricating oil in the cam chamber flows through the bearing behind it and accumulates in the governor chamber, so that the cam mechanism in the cam chamber is sufficiently lubricated. I didn't like it at all.

Furthermore, Japanese Utility Model Publication No. 47-1765 discloses a fuel injection pump for an internal combustion engine in which the pump chamber side and the governor chamber side are connected through a communication pipe. If the governor chamber side is located higher than the pump chamber side on a slope or slope, it becomes difficult to supply lubricating oil to the governor chamber.

Furthermore, in Japanese Utility Model Publication No. 56-41081, a cam chamber and a governor chamber are separated by a partition wall, and a communication passage that allows lubricating oil to flow from the cam chamber to the governor chamber is located above the camshaft. A lubricating device for a fuel pump drive part in a diesel engine is provided, in which a hole is bored in the partition wall of the diesel engine, and an outflow hole for allowing lubricating oil to flow out from the governor chamber is located below the camshaft. However, in this lubricating device, as in the case of the above-mentioned fuel injection pump, when the vehicle is on a slope or slope and the governor chamber is located above the cam chamber, the lubricating oil is not supplied. It becomes difficult to supply that governor room.

Therefore, the purpose and problem of this invention was to enable a sufficient supply of lubricating oil to the cam chamber and governor chamber at all times, regardless of whether the vehicle is traveling on a slope or is stopped on a slope for work. Provides fuel injection equipment.

Description of Specific Examples The fuel injection device of this invention will be described below based on the specific examples shown in the drawings. The figure shows a tenth specific example of the fuel injection device of this invention applied to a diesel engine. ing.

The fuel injection device 10 includes a row type fuel injection pump 1 having a cam chamber formed in a pump casing 13.
1, a mechanical governor 12 with a governor chamber formed in the governor casing 14, and its pump.
Ball valve 17 located in casing 13
It was manufactured to include a cam chamber side oil supply pipe 18, a governor chamber side oil supply pipe 19, and an oil pump side oil supply pipe 20.

In the fuel injection pump 11, both ends of a camshaft 21 are rotatably supported by a pair of bearings 22, 23, and in the mechanical governor 12, an overflow pipe 24 is connected to the governor for lubricating oil 32.・
It is connected to the side wall of the casing 14.

The ball valve 17 has a valve chamber 26 formed therein, and has a cam chamber side outlet port 27 and a governor chamber side outlet port 28 opened to the valve chamber 26 in the front-rear direction, and a valve chamber 26 in the upper direction. A valve body 25 having an inlet port 29 opening at 26 and disposed in the pump casing 13 in a predetermined position, and a valve chamber 26 thereof.
The structure includes a ball 30 which is disposed to be movable in the front-rear direction inside and opens and closes the outlet ports 27 and 28 on the cam chamber side and the governor chamber side.

In the ball valve 17, the governor casing 14 is located above the pump casing 13, or the pump casing 14 is located above the pump casing 13.
Depending on whether the casing 13 is positioned above the governor casing 14, the ball 3
0 closes either the cam chamber side outlet port 27 or the governor chamber side outlet port 28.

The cam chamber side oil supply pipe 18 has one end connected to the cam chamber side outlet port 27, and the other end 1
5 is located below the cam chamber side outlet port 27 and opens into the cam chamber, and one end of the governor chamber side oil supply pipe 19 is connected to the governor chamber side outlet port 28, and the other end is connected to the governor chamber side outlet port 28. The end 16 is located below the governor chamber side outlet port 28 and opens into the governor chamber, and the oil pump side oil supply pipe 20 has an inlet port on the discharge side of an oil pump (not shown). Port 29 is connected.

Next, the flow of the lubricating oils 31 and 32 in the above-mentioned fuel injection device 10 will be explained.

This fuel injection device 10 is kept horizontal when the vehicle is on a flat road and the vehicle body is not tilted,
The oil pump supplies lubricating oil 31 from the oil pump side oil supply pipe 20 to the ball valve 17, and further flows into the cam chamber side and governor room side oil supply pipes 18, 19 to the pump. The casing 13 and the governor casing 14 are filled with oil, which overflows from the front bearing 22 of the pump casing 13 and the overflow pipe 24 of the governor casing 14 and is circulated back to the oil pump.

Also, as shown in the figure, when the vehicle is on a slope, the vehicle body is tilted, and the governor casing 14 is positioned above the pump casing 13, the ball 30 is located at the outlet port 27. and its exit port 2
8 is opened, the lubricating oil 31 flows from the oil pump side oil supply pipe 20 to the governor room side oil supply pipe 19 to supply the governor casing 14, and further flows through the bearing 23 at the rear thereof to the pump. - After the casing 13 is filled with oil, it overflows to the outside from the bearing 22 in front of it and is circulated to the oil pump.

Also, in the opposite direction, that is, the pump casing 13 is connected to the governor casing 1.
4, the ball 30 closes the outlet port 28 and opens the outlet port 27, and the lubricating oil 31 is supplied to the pump casing 13; 32 flows through the rear bearing 23 to oil the governor casing 14 and is again circulated through the overflow pipe 24 to the oil pump.

Convenience and benefits of the invention According to the above invention, the in-line fuel injection pump forms a cam chamber in the pump casing, the mechanical governor forms a governor chamber in the governor casing, and the ball valve has a valve chamber formed inside, and has a cam chamber-side outlet port and a governor chamber-side outlet port that are open to the valve chamber in the front-rear direction, and an inlet port that is open to the valve chamber in the upper direction. and a valve body disposed in the pump casing at a predetermined position, and a ball disposed in the valve chamber so as to be movable in the front and rear direction to open and close the cam chamber side and governor chamber side outlet ports. The cam chamber side oil supply pipe has one end connected to the cam chamber side outlet port, and the other end is located below the cam chamber side outlet port and opens into the cam chamber, and the governor chamber side oil supply pipe is connected to the cam chamber side outlet port. The piping has one end connected to the governor chamber side outlet port, and the other end located below the governor chamber side outlet port and opens into the governor chamber, and the oil pump side oil supply piping, The inlet port of the oil pump is connected to the discharge side of the oil pump, so even if the vehicle is tilted when the vehicle is traveling on a slope or is stopped on a slope for work, the ball valve will remain in its position. It opens and closes automatically in response to the inclination of the vehicle body, and accordingly, lubricating oil is supplied to the upper chamber in the cam chamber and the governor chamber. The lubricating oil flows from the chamber located at Damage to the mechanism is prevented.

Relationship between the invention and specific examples As mentioned above, from the specific examples of this invention explained with reference to the drawings, for those who have ordinary knowledge in the field of technology pertaining to this invention,
Various design modifications and changes can be easily made, and furthermore, the content of this invention is essential to the establishment of the invention that accomplishes the task of the invention,
It originates from the technical essence of the invention, which is the nature of the invention, and can be easily replaced by a mode that is objectively recognized as incorporating it.

[Brief explanation of the drawing]

The figure is a schematic diagram of the fuel injection device of this invention applied to a diesel engine. 17...Ball valve, 18...Cam chamber side oil supply pipe, 19...Governor chamber side oil supply pipe, 20...
Oil/pump side oil supply piping, 25...Valve body, 26...Valve chamber, 27...Cam chamber side outlet port, 28...Governor chamber side outlet port, 29...Inlet port, 30...Ball.

Claims (1)

[Scope of claim for utility model registration] An in-line fuel injection pump with a cam chamber formed within the pump casing, a mechanical governor with a governor chamber formed within the governor casing, and a valve chamber formed inside. In the front-rear direction, a cam chamber-side outlet port and a governor-chamber side outlet port that are open to the valve chamber, and above,
A valve body having an inlet port opened to the valve chamber and disposed in the pump casing at a predetermined position; and a ball valve consisting of a ball that opens and closes an outlet port on the governor chamber side, one end of which is connected to the outlet port of the cam chamber, and the other end of which is located below the outlet port of the cam chamber. Connect the cam chamber side oil supply pipe opened to the governor chamber side outlet port at one end,
and a governor chamber side oil supply pipe whose other end is located below the governor chamber side outlet port and opens into the governor chamber, and an oil pump side whose inlet port is connected to the discharge side of the oil pump. A fuel injection device comprising a fuel supply pipe.