JP2546406Y2 - Oil pump - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an oil pump,
More specifically, the present invention relates to an oil pump used for a lubricating oil supply system such as a vehicle engine.

[0002]

2. Description of the Related Art As a conventional oil pump used for such a purpose, for example, Japanese Utility Model Laid-Open No. 63-112290 is known.
Japanese Unexamined Patent Publication No. 63-40595 and Japanese Utility Model Laid-Open Publication No. Sho 63-40595 are known. Each of these is an inscribed oil pump directly connected to the crankshaft of the engine. The oil is guided from the suction chamber side to the volume chamber formed between the tips of the rotor, and the oil delivered to the discharge chamber side. Is sent out to each part of the lubrication system through the discharge passage.

[0003]

However, in the conventional oil pump as described above, the pump casing that rotatably houses the rotor is provided with a discharge chamber and a discharge chamber, and the discharge chamber has an inlet to the discharge passage. Is opened, and the flow of the oil guided from the discharge chamber at the opening is rapidly reduced. In addition, the periphery of the opening facing the discharge chamber is left in an angular shape due to the difficulty in processing from the discharge chamber side.

As a result, when the oil guided to the discharge chamber flows into the discharge passage, the oil is contracted in the passage near the opening,
There is a drawback that the loss horsepower of the pump increases due to a decrease in efficiency based on the pressure loss of the fluid.

An object of the present invention is to provide an oil pump in which oil is efficiently introduced from a discharge chamber to a discharge passage in order to eliminate such a conventional disadvantage.

[0006]

An oil pump according to the present invention
The pump is an oil pump configured to guide oil discharged through a rotor from a discharge chamber to a discharge passage opening to a wall surface of the discharge chamber , wherein the discharge chamber has a radius of the rotor.
Direction, and the discharge passage is open to the discharge chamber .
The wall of the rotor and the length of the discharge passage
It is characterized by being inclined obliquely to the direction .

[0007]

When the [action] Ru good to the present invention, the discharge chamber by the rotation of the rotor
The oil inside is discharged to the discharge passage through the opening in the wall
You. Here, the area of the opening of the discharge passage facing the discharge chamber
Is inclined with respect to the axis of the rotor and the longitudinal direction of the discharge passage.
Because it is inclined, it is larger than the passage cross-sectional area of the discharge passage,
Razz contraction in the opening portion to put, ejection to smoothly discharge passage
It issued Ru.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. In these figures, 1 is a pump housing, 2
Is a pump cover, 3 is a pump chamber formed between the pump housing 1 and the cover 2, 4 is an outer rotor, 5 is an inner rotor, and 6 is a drive shaft fitted into a shaft hole of the inner rotor 5. In this embodiment, an oil suction chamber 7 and a discharge chamber 8 are provided in the pump housing 1, and a rotation chamber 9 formed between the tips of both rotors by rotation of the inner rotor 5 in the direction of the arrow. The guided oil is confined and then sent to the discharge chamber 8.

Reference numeral 10 denotes a discharge passage for guiding the oil delivered to the discharge chamber 8 to a lubrication system (not shown), and reference numeral 11 denotes an opening at the inlet of the discharge passage 10 which opens on the wall surface of the discharge chamber 8. Thus, in this embodiment, the wall surface 8A of the discharge chamber 8 in which the opening 11 is formed.
Are formed obliquely to the direction of the discharge passage 10 as shown in FIG. By forming the wall surface 8A so as to be inclined in this manner, the shape of the opening 11 that opens the wall surface 8A can be made substantially elliptical or elliptical with the direction along the above-mentioned passage as the major axis, and accordingly the axial direction It is possible to keep the opening area widened. In FIGS. 1 and 3,
Reference numeral 12 denotes a discharge port provided in the discharge passage 10, and 13 denotes a blind lid.

In the oil pump configured as described above, the oil guided from the oil pan (not shown) to the suction chamber 7 via the suction port 14 and the suction passage 15 rotates the inner rotor 5 to rotate the inner rotor 5 and the outer rotor 4. It is drawn into the volume chamber 9 formed between the tooth tips, pressurized while being confined, and sent out to the discharge chamber 8. Then, the oil is guided from here to the discharge passage 10 through the opening 11, but since the opening 11 is largely opened obliquely on the wall 8A of the discharge chamber, the oil flows through the opening as in the conventional case. Is suppressed to cause a contraction. Therefore, the horsepower loss of the engine can be prevented by reducing the pressure loss of the fluid due to the contraction.

[0012]

[0013]

[Effect of the Invention] According to the oil pump of the present invention,
The wall opening the passage to the discharge chamber is
Since it is made to incline obliquely to the longitudinal direction of the path, it is possible to prevent pressure loss due to the contraction of the flow of oil flowing from the discharge chamber into the discharge passage, and to increase pump efficiency. The effect of suppressing the loss horsepower is obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention with a cover removed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 pump housing 2 pump cover 3 pump chamber 4 outer rotor 5 inner rotor 8 discharge chamber 8A wall surface 10 discharge passage 11 opening

Claims (1)

(57) [Scope of request for utility model registration] 1. An oil pump for guiding oil discharged through a rotor from a discharge chamber to a discharge passage opening to a wall surface of the discharge chamber , wherein the discharge chamber is located radially outward of the rotor. A wall formed so that the discharge passage opens to the discharge chamber is formed by the rotor.
Inclined with respect to the axis of
An oil pump characterized by being inclined .