JPH082406Y2 - Internal combustion engine oil pump - Google Patents

Description

The present invention relates to an oil pump for an internal combustion engine, and more particularly to an oil pump for an internal combustion engine that discharges oil to a predetermined portion of the internal combustion engine to lubricate the internal combustion engine. .

[Conventional technology]

As the oil pump, there are a gear pump that pumps oil by meshing two gears, an oil pump that uses a trochoid curve having an inner rotor and an outer rotor, and the like.

For example, an oil pump utilizing this trochoidal curve meshes the inner teeth of the inner rotor formed by the trochoidal curve with the outer teeth of the inner rotor, and the axial centers of the oil teeth are made different to be incorporated in the pocket of the pump housing. The number of inner teeth of the inner rotor is smaller than the number of outer teeth of the outer rotor by one, and by rotating the inner rotor, the outer rotor rotates in the same direction as the inner rotor. The space formed by the outer teeth of the pump changes its volume and acts as a pump, sucking fluid from the inflow port and discharging it to the discharge port side, which is smaller than other types of oil pump of the same volume. Since the structure is simple and the meshing noise is small, it is widely used as an oil pump such as a vehicle lubricating oil pump and an automatic transmission oil pump.

In addition, as another engine, the actual development Sho 51-66645
As disclosed in the publication, an oil pump is provided near the crankshaft bearing in the front part of the cylinder block, and the oil pump is driven by a drive mechanism provided on a camshaft, a cooling fan, a dynamo, a water pump, a balancer shaft, etc. There was something I did.

[Problems to be solved by the invention]

By the way, in the conventional oil pump of the internal combustion engine, as shown in FIG. 3, the oil in the oil pan (not shown) is purified by the strainer (not shown), and the lower port is supplied through the suction side opening 128. 126 is sucked into the main body 122 of the oil pump 120 through the lower port 126, and the oil pressurized by the oil pump 120 is discharged from the upper port 124 through the discharge side opening 130 to a predetermined portion (not shown). Was being supplied to.

As a result, when the internal combustion engine is stopped, the height position of the suction side opening communicating with the lower port is lower than the height position of the discharge side opening communicating with the upper port, so that the oil pump and the lower port The oil falls through the suction side opening to the oil pan side, and the amount of oil in the oil pump decreases, so when the internal combustion engine is restarted, the oil supply to the specified part is temporarily interrupted, However, there is an inconvenience that it cannot be supplied sufficiently.

In cold regions, the low temperature increases the viscosity of the oil, making it difficult to suck the oil into the oil pump from the oil pan, delaying the oil supply and causing seizure of the internal combustion engine. there were.

[Purpose of device]

Therefore, in order to eliminate the above-mentioned inconvenience, the object of the present invention is to make the suction side opening and the discharge side opening of the oil pump respectively higher than the central height position of the crankshaft arranged in the cylinder block of the internal combustion engine. The oil pump is formed by the main body and the upper and lower ports, and the height position of the suction side opening is set so that the upper side port is the suction side and the lower side port is the discharge side. By forming it larger than the position, it is possible to prevent the oil from falling into the oil pan and hold the oil in the oil pump securely.
An object of the present invention is to realize an oil pump for an internal combustion engine that can sufficiently supply oil to a predetermined portion even when the internal combustion engine is restarted.

[Means for solving problems]

In order to achieve this object, the present invention is directed to an oil pump for an internal combustion engine, which sucks oil in an oil pan into a suction side opening of an oil pump through a strainer and discharges oil from the discharge side opening to lubricate a predetermined portion. In the above, the respective height positions of the suction side opening and the discharge side opening of the oil pump are arranged to be larger than the central height position of the crankshaft arranged in the cylinder block of the internal combustion engine, and the oil pump is It is formed by the main body and the upper and lower side ports, and the height position of the suction side opening is formed larger than the height position of the discharge side opening so that the upper side port is the suction side and the lower side port is the discharge side. Is characterized by.

[Action]

With the above configuration, oil is retained in the oil pump even when the internal combustion engine is stopped, and oil shortage at restart of the internal combustion engine is prevented.

〔Example〕

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

1 and 2 show an embodiment of the present invention. In FIGS. 1 and 2, 2 is an internal combustion engine, 4 is a cylinder block, 6 is a strainer, and 8 is an oil pan. In the internal combustion engine 2, a cylinder head (not shown) is attached to an upper surface 4a of a cylinder block 4, and an oil pan 8 is attached to a lower surface 4b.

A crankshaft 12 is rotatably mounted on a crankshaft bearing portion 10 of the cylinder block 4 by a mounting portion 14 having a U-shaped cross section.

An oil drain hole 16 for exchanging oil is provided at a bottom portion of the oil pan 8, a drain bolt 18 is screwed into the oil pan 8, and the oil in the oil pan 8 is purified to be described later. A strainer 6 to be introduced into the pump 20 is arranged.

Then, a suction side opening 28 of the oil pump 20 described later is provided.
The respective height positions of the discharge side opening 30 and the discharge side opening 30 are arranged larger than the center height position of the crankshaft 12 arranged in the cylinder block 4 of the internal combustion engine 2, as is apparent from FIG.

The oil pump 20 is composed of a main body 22 that pressurizes oil and upper and lower ports 24 and 26.
The height position of the suction side opening 28 is configured to be larger than the height position of the discharge side opening 30 so that 24 is on the suction side and the lower port 26 is on the discharge side.

That is, as shown in FIG. 2, the upper port 24 and the strainer 6 communicating with the oil pan 8 are communicated with each other by the suction passage 32, and the lower port 26 and a predetermined portion (not shown) of the internal combustion engine 2 are connected with each other. The discharge passages 34 communicate with each other. At this time, the height position of the suction side opening 28 that is the oil pump 20 side opening of the suction passage 32, that is, the lower surface of the cylinder block 4.
The height A from 4b to the lower portion of the suction side opening 28 is the height position of the discharge side opening 30, which is the oil pump 20 side opening of the discharge passage 34, that is, the height from the lower surface 4b of the cylinder block 4 to the lower portion of the discharge side opening 30. It is larger than B.

Further, the oil pump 20 is a conventional one in a predetermined direction,
For example, it can be realized by rotating in a clockwise direction by a predetermined angle to reverse the arrangement of the upper and lower ports and extending the suction passage 32.

 Next, the operation will be described.

When the internal combustion engine 2 is started, the oil in the oil pan 8 enters the suction passage 32 through the strainer 6, and the suction passage 32 enters the upper port 24 to enter the main body of the oil pump 20.
Guided within 22. The oil pressurized in the main body 22 of the oil pump 20 is discharged to the lower port 26, and is supplied from the lower port 26 to a predetermined portion (not shown) of the internal combustion engine 2 through the discharge passage 34. Has been lubricated.

Further, when the internal combustion engine 2 is stopped, the intake side opening 28
Since the height position A is higher than the height position B of the discharge side opening 30, the oil is retained in the lower port 26 of the oil pump 20.

As a result, it is possible to prevent the oil from dropping from the oil pump 20 to the oil pan 8 when the internal combustion engine 2 is stopped, and to reliably hold the oil in the oil pump to prevent the oil from breaking. Even when the engine is restarted, oil can be sufficiently supplied to a predetermined portion (not shown) of the internal combustion engine 2, and seizure of the internal combustion engine 2 due to insufficient oil can be prevented, which is practically advantageous.

Further, the height positions of the suction side opening 28 and the discharge side opening 30 of the oil pump 20 are as shown in FIG.
By disposing the crankshaft 12 in the cylinder block 4 of the internal combustion engine 2 at a position higher than the center height position, at least the crankshaft 12 peripheral portion is filled with oil even when the engine is stopped. Therefore, the oil is constantly supplied to the rotating portion, which contributes to preventing the internal combustion engine 2 from burning.

[Effect of device]

As described in detail above, according to the present invention, the respective height positions of the suction side opening and the discharge side opening of the oil pump are made larger than the central height position of the crankshaft arranged in the cylinder block of the internal combustion engine. The oil pump is formed by the main body and the upper and lower ports, and the height position of the suction side opening is set to be higher than that of the discharge side opening so that the upper port is the suction side and the lower port is the discharge side. Since it is also formed large, it is possible to prevent the oil from falling from the oil pump to the oil pan and hold the oil in the oil pump securely, and it is possible to sufficiently supply the oil to a predetermined part even when the internal combustion engine is restarted. It is possible to prevent seizure of the internal combustion engine due to lack of oil, which is practically advantageous. Further, the height positions of the suction side opening and the discharge side opening of the oil pump are arranged to be larger than the center height position of the crankshaft arranged in the cylinder block of the internal combustion engine, Even when the engine is stopped, at least the crankshaft peripheral portion is filled with oil, and the rotating portion is constantly supplied with oil, which can contribute to preventing seizure of the internal combustion engine.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a schematic cross-sectional explanatory view of an internal combustion engine, and FIG. 2 is an enlarged view of essential parts of an oil pump. FIG. 3 is an enlarged view of the essential parts of an oil pump showing the prior art of this invention. In the figure, 2 is an internal combustion engine, 4 is a cylinder block, and 6
Is a strainer, 8 is an oil pan, 10 is a crankshaft bearing portion, 12 is a crankshaft, 14 is a mounting portion, 16 is an oil drain hole portion, 18 is a drain bolt, 20 is an oil pump, 22 is a main body, and 24 is An upper port, 26 is a lower port, 26 is a suction side opening, 30 is a discharge side opening, 32 is a suction passage, and 34 is a discharge passage.

Claims (1)

[Scope of utility model registration request] 1. An oil pump for an internal combustion engine, which sucks oil in an oil pan into a suction side opening of an oil pump through a strainer and discharges oil from a discharge side opening to lubricate a predetermined portion. The intake pump opening and the discharge pump opening of the oil pump are arranged at a height higher than the center height of the crankshaft arranged in the cylinder block, and the oil pump is connected to the main body and the upper and lower ports. The internal combustion engine is characterized in that the height position of the suction side opening is made larger than the height position of the discharge side opening so that the upper side port is the suction side and the lower side port is the discharge side. Oil pump.