JP3413493B2 - Piston driven oil pump device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston drive type oil pump device.

[0002]

2. Description of the Related Art Generally, engine lubrication not only reduces frictional resistance in the engine but also has an important meaning for cooling the engine. Therefore, engine oil for lubrication is injected into the engine.

There are two types of engine lubrication, one is pushing by an oil pump and the other is scattering of main moving parts.
In general, a wet pump system in which engine oil is collected in an oil pan under the engine and is sent to a main part of the engine by driving an oil pump is the mainstream.

The oil pump in the pump system is
It is used to push engine oil to the crankshaft, cam bearings, etc., and the oil pump is driven directly by the crankshaft or indirectly by gears, chains, timing belts, etc., and is trochoidal or crescent type. , A gear type, a vane type, etc. Among them, a trochoid type composed of an inner rotor and an outer rotor is generally used.

The conventional oil pump installation structure is shown in FIG.
As shown in FIG. 4, an installation space (21) is provided on the side surface of the cylinder block (20), and the oil pump cover (2
2), the inner and outer rotors (23, 24), the front case (25), etc. are assembled in this order. When the inner rotor (23) is coupled to the front portion of the crankshaft (26) and driven, the inner rotor (23 23, the center of the inner rotor is eccentric with respect to the center of the outer rotor (24), so that the convex teeth (23a) of the inner rotor (23) and the concave groove portion (24) of the outer rotor (24).
While a) sequentially rotates while meshing with each other, the volume space is changed, and the oil sucked through the pump suction port (27) is compressed and pushed through the pump discharge port (28) to each part of the engine.

[0006]

By the way, according to the rotor structure as described above, each time the crankshaft makes one revolution, contact is made by the number of teeth of the inner rotor (23) and a noise is generated. That is, the noise is increased as the engine rpm is increased. As described above, the noise generated by driving the oil pump occupies an important region of engine noise. Further, as another problem, in the case of the conventional oil pump, it is pointed out that the structural process is complicated because a large number of parts must be assembled.

The present invention has been made to solve the above-mentioned various problems, and its objects are simple parts and structure, excellent compression efficiency, and significantly reducing noise generated. An object of the present invention is to provide an oil pump device that can be operated.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is an oil pump provided on one side of a cylinder block in which a cylinder is formed in which a piston is reciprocally driven in accordance with an explosion of a combustion chamber. Cylinder, an oil pump piston that is reciprocally driven in the oil pump cylinder by a crankshaft that converts the reciprocating motion of the piston into a rotational motion, and an oil gallery that communicates with the upper side of the oil pump cylinder. And an oil suction port formed on the upper side of the oil pump cylinder adjacent to the oil discharge port and connected to the oil pan side, and the oil pump cylinder moves downward. In this case, the oil intake port is opened and the oil discharge port is shut off. Characterized in that it is configured to include an oil suction valve and an oil discharge valve for opening and closing operation by a valve train so as to open the outlet.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a view showing a piston drive type oil pump device according to the present invention. A cylinder block (10, hereinafter, a concept including a cylinder head) has four cylinders (1, 2, 3 in the case of a four cylinder engine). , 4) are arranged in order, and an oil pump cylinder (5) is formed adjacent to the first cylinder (1) or the fourth cylinder (4).

An oil pump piston (6) is provided in the oil pump cylinder (5) so as to reciprocate, and the oil pump piston (6) is connected to a crankshaft by a connecting rod (7). It is connected to (8). An oil suction port (9) and an oil discharge port (11) are formed on the upper side of the oil pump cylinder (5), and the oil suction port and the discharge port (9, 11) are formed.
Are the oil intake valve (12) and the oil discharge valve (1
It is opened and closed by 3). In addition, the oil intake valve (1
2) and the oil discharge valve (13) are opened / closed by a valve train (14, an intake / exhaust valve operating mechanism) for opening / closing the combustion cylinders (1, 2, 3, 4).

Next, the oil feeding process according to the present invention will be described. No. 1 to 4 cylinders (1, 2, 3, 4)
When are sequentially exploded, the crankshaft (8) obtains rotational power, and the oil pump piston (6) connected to the crankshaft (8) is also vertically reciprocated in the oil pump cylinder (5). . In this case, when the oil pump piston (6) descends from the position of the top dead center, the valve train (14) such as the cam shaft causes the oil intake valve (12) to open the oil intake port (9) and the oil discharge valve. (13) shuts off the oil outlet (11). As a result, the oil in the oil pan is sucked into the oil pump cylinder (5) due to the formation of negative pressure in the oil pump cylinder (5).

When the piston (6) for the oil pump reverses and rises, contrary to the above, the oil suction valve (12) shuts off the oil suction port (9) and the oil discharge valve (13) moves to the oil discharge port ( Open 11). When the oil pump piston (6) rises, the engine oil with which the oil pump cylinder (5) is filled receives a compressive force, whereby the oil gallery (15) is passed through the opened oil discharge port (11). ), The engine oil is pumped to each of the moving parts of the engine.

Here, in place of the oil intake and exhaust valves (12, 13) operated by the valve train (14), a valve seat portion is provided at the oil intake (9) and the oil exhaust (11) as shown in FIG. Forming (18, 19),
Plate valves (16, 17) that are in close contact with the valve seats (18) and (19) or that are opened and closed separately may be provided so that oil can be sucked and discharged easily.

[0014]

As described above, according to the present invention, the oil pump cylinder is formed following the cylinder block so as to be adjacent to the cylinder for obtaining power, and the oil pump cylinder sucks in the oil and then compresses and discharges the oil. By providing the engine oil piston on the oil pump cylinder so that the engine oil piston operates in conjunction with the crankshaft, the structure of the oil pump can be simplified and the noise generation can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic view showing a piston drive type oil pump device according to the present invention.

FIG. 2 is a view showing an embodiment of an oil intake / exhaust valve of the present invention.

FIG. 3 is a diagram showing a conventional technique.

FIG. 4 is a diagram showing a conventional technique.

[Explanation of symbols]

1, 2, 3, 4. ． ． Cylinder 5. ． ． Cylinder for oil pump 6. ． ． Piston for oil pump 7. ． ． Connecting rod 8. ． ． Crankshaft 9. ． ． Oil inlet 10. ． ． Cylinder block 1 l. ． ． Oil outlet 12. ． ． Oil intake valve 13. ． ． Oil drain valve 14. ． ． Valve train 15. ． ． Oil gallery 16. ． ． Plate valve for oil intake 17. ． ． Plate valve for oil discharge

Claims (2)

(57) [Claims] 1. An oil pump cylinder provided on one side of a cylinder block having a cylinder in which a piston is reciprocally driven by an explosion of a combustion chamber, and a crankshaft converting a reciprocating motion of the piston into a rotary motion. An oil pump piston that is reciprocally driven in the pump cylinder, an oil discharge port formed so as to communicate with an oil gallery to the upper side of the oil pump cylinder, and an oil discharge to the upper side of the oil pump cylinder. When an oil intake port formed adjacent to the outlet and connected to the oil pan side and the oil pump cylinder are lowered, the oil intake port is opened to block the oil discharge port, and the ascending action is performed. The valve train opens and closes so that the oil inlet is closed and the oil outlet is opened. A piston drive type oil pump device comprising an oil intake valve and an oil discharge valve. 2. An oil pump cylinder provided on one side of a cylinder block formed with a cylinder in which a piston reciprocates in response to an explosion in a combustion chamber, and a crankshaft converting the reciprocating motion of the piston into a rotary motion. An oil pump piston that is reciprocally driven in the oil pump cylinder, an oil discharge port formed to communicate with an oil gallery to the upper side of the oil pump cylinder, and an upper side of the oil pump cylinder. An oil inlet formed adjacent to the oil outlet and connected to the oil pan side, and when the oil pump cylinder descends, separates from the valve seat of the oil inlet and opens the oil inlet. Close the valve seat of the oil outlet, shut off the oil outlet, and use the oil inlet when moving up. Close to the valve seat of the and close the oil inlet,
A piston-driven oil pump device comprising a plate-like valve for oil suction and discharge that is rotated to open the oil discharge port away from the valve seat portion of the oil discharge port.