KR100569017B1 - Structure of oil pump for vehicle - Google Patents

Abstract

An oil pump structure for an automobile is disclosed. The disclosed oil pump structure for a vehicle includes a housing, a driven gear mounted to the housing, a drive gear inserted to be inscribed in the driven gear, and a crescent provided in an empty space because the drive gear is not engaged. In the oil pump structure for automobiles, the housing is formed with a support for supporting the driven gear and the drive gear, characterized in that the support is formed with an oil passage through which oil flows.

According to the present invention, oil buoyancy can be generated even where there is no buoyancy such as crescent, thereby minimizing non-uniform buoyancy along the gear circumference, thereby minimizing rotational imbalance, and minimizing wear of the pump housing and gear, Durability, etc. can be increased, there is an advantage in minimizing unnecessary leakage due to malfunction, and also reduce noise.

Oil Pump, Crescent, Driven Gear, Drive Gear

Description

Automotive oil pump structure {STRUCTURE OF OIL PUMP FOR VEHICLE}

1 is a view schematically showing the configuration of an oil pump structure for a vehicle according to the prior art.

FIG. 2 is a schematic cross-sectional view taken along line A-A in FIG. 1. FIG.

3 is a view schematically showing the configuration of the oil pump structure for a vehicle according to the present invention.

4 and 5 are schematic cross-sectional views shown by cutting along the lines A-A and B-B in FIG.

<Description of Symbols for Main Parts of Drawings>

11. Driven gear

12. Inlet

13. Discharge port

14. Drive gear

15. Crescent

20. Housing

21. First support

22. Second Support

23. The first oil passage

24. The second oil passage

The present invention relates to an oil pump structure for an automobile, and more particularly, to an oil pump structure for an automobile for improving durability of an oil pump, minimizing leakage, and reducing gear noise.

In general, a vehicle transmission is installed between an engine and a propulsion shaft so that a proper gear selection can be maintained according to a driving state of a vehicle.

Among the transmissions for automobiles, the automatic transmission has an input shaft and an output shaft disposed inside the transmission case, and a plurality of friction elements are disposed on the outer circumference thereof. This friction element is selectively operated to be a shift of the vehicle. The selective actuation of the friction element is by hydraulic pressure. Therefore, the automatic transmission has a structure in which an oil pump for operating the friction element is included in the transmission case.

The oil pump, for example, is installed on one side of the torque converter in the transmission case of the vehicle, and consists of a structure that operates simultaneously with the pump impeller of the torque converter.

FIG. 1 illustrates a general automotive oil pump structure, and FIG. 2 illustrates a cross-sectional view of the oil pump in FIG. 1.

Referring to the drawings, the oil pump structure for an automobile includes a housing 10, a driven gear 1, a drive gear 4, and a crescent 5. have.

That is, the vehicle oil pump structure is such that the drive gear (gear) 4 is inscribed in the inlet 2 and the outlet 3 in the driven gear (outer gear) 1 mounted to the housing 10. The internal gear pump is provided with a crescent 5 in an empty space because the drive gear 4 is not engaged with the drive gear 4.

The driven gear 1 and the drive gear 4 are mostly involute teeth, and are characterized by small size and light weight.

The oil pump structure for automobiles configured as described above allows the oil of the oil tank (not shown) to be input to one side of the drive gear 4 and the driven gear 1 to rotate the drive gear 4 fixed to the input shaft 6. do. At this time, the oil is compressed while passing between the drive gear 4, the compressed oil is discharged, for example to operate the friction element in the automatic transmission.

By the way, the gear around the crescent (5) is not buoyant, but because the oil pressure of the inlet (2) and discharge port (3) of the oil passage is subjected to buoyancy in the circumferential direction of the gear, this phenomenon is the drive gear (4) ) And an unbalanced oil buoyancy in the circumferential direction of the driven gear (1).

That is, rotational imbalance occurs in the rotating gears 1 and 4 due to the buoyancy generated. As a result, wear and the like with the housing 10 occurs, so that durability and the like are lowered, operation becomes poor, and unnecessary leakage occurs. In addition, the imbalanced buoyancy causes pump noise, Drone.

The present invention has been made to solve the above problems, an object of the present invention is to provide an oil pump structure for an automobile to improve the durability of the oil pump, minimize leakage, and reduce gear noise.

The oil pump structure for automobiles of the present invention for achieving the above object is a housing, a driven gear mounted to the housing, a drive gear inserted to be inscribed in the driven gear, and the drive gear is not engaged. In the oil pump structure for an automobile including a crescent provided in an empty space, the housing is formed with a support for supporting the driven gear and the drive gear, the support is formed with an oil passage through which the oil flows It features.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic view showing the configuration of the oil pump structure for an automobile according to the present invention, and FIGS. 4 and 5 are cross-sectional views cut along the lines BB and CC of FIG. 3, respectively. .

Prior to the description, the configuration of a general automotive oil pump structure will be referred to the above description, and only the characteristic configuration of the present invention will be described in detail.

Referring to each of the drawings, the oil pump structure for automobiles according to the present invention, the housing 20, the driven gear (11) mounted on the housing 20, is inserted and installed to be inscribed in the driven gear (11) It includes a drive gear 14 and the crescent 15 provided in the empty space is not engaged with the drive gear 14, the housing 20 is driven gear 11 and the drive gear 14 A support portion is formed to support the oil passage, and an oil passage through which oil flows is formed.

In more detail, as shown in FIGS. 4 and 5, the support part includes a first support part 21 supporting the driven gear 11 and a second support part supporting the drive gear 14 ( 22).

The oil passage is formed in the first support portion 21 and is connected to the oil discharge port 13 to receive the oil pressure, and is formed in the first oil passage 23 and the second support portion 22. The second oil passage 24 is connected to the oil passage 23 and supplies oil pressure to the drive gear 14.

The first and second oil passages 23 and 24 are separated from the oil inlet 12, and are connected only to the outlet 13.

Referring to the operation of the oil pump structure for a vehicle according to the present invention having the configuration as described above are as follows.

Prior to the description, the operation of the general automotive oil pump structure will be referred to the above description, and only the characteristic operation of the present invention will be described in detail.

Referring again to the drawings, the oil pump structure for an automobile according to the present invention, as described above, the oil buoyancy unbalanced in the circumferential direction of the gears 11 and 14 by the oil pressure difference between the inlet 12 and the outlet 13. This is to eliminate the various problems that occur, that is, to reduce the difference in oil buoyancy appearing on both sides.

As shown in FIG. 1 and FIG. 2, the existing housing 10 has no support plane capable of supporting the gears 1 and 4 at the inlet 2 and the outlet 3 of the oil.

However, as shown in FIGS. 3 to 5 of the present invention, in the housing 20 of the oil pump, first and second support parts 21 and 22, which are support planes capable of supporting gears, are formed. The first and second oil passages 23 and 24 through which oil flows are formed in the second supporting parts 21 and 22.

The first and second oil passages 23 and 24 through which the oil flows are separated from the inlet 12 of the oil, and are connected only to the outlet port 13 at which the pressure rises.

Accordingly, when the pressure generated at the suction port 12 forms the same pressure at both the drive gear 14 and the driven gear 11, the difference in the buoyancy caused by the pressure difference between the suction port 12 and the discharge port 13 is minimized. The first and second oil passages 23 and 24 simultaneously supply oil to the lower end of the drive gear 14 and the driven gear 11.

Therefore, if the pressure generated in the inlet 12 through which oil flows forms a pressure across the drive gear 14 and the driven gear 11, the buoyancy difference of the gear generated due to the crescent part 15 may be minimized. .

As described above, the automotive oil pump structure according to the present invention has the following effects.

Oil buoyancy can be generated even where there is no buoyancy, such as crescent, to minimize non-uniform buoyancy along the gear circumference to minimize rotational imbalance. Accordingly, wear of the pump housing and the gear can be minimized, and durability can be increased. In addition, it is possible to minimize unnecessary leakage due to malfunction and to reduce noise.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (3)

In a motor oil pump structure comprising a housing, a driven gear mounted to the housing, a drive gear inserted to be inscribed in the driven gear, and a crescent provided in an empty space because the drive gear is not engaged. , The housing is provided with a support for supporting the driven gear and the drive gear, the support portion is an automobile oil pump structure, characterized in that an oil passage through which oil flows. The method of claim 1, The support part includes a first support part for supporting the driven gear and a second support part for supporting the drive gear, The oil passage may include a first oil passage formed in the first support portion and connected to an oil discharge port to receive oil pressure, and formed in the second support portion and connected to the first oil passage to provide oil pressure to the drive gear. Automotive oil pump structure, characterized in that consisting of the second oil passage to supply. The method of claim 2, The first and second oil passages are separated from the inlet of the oil, and the oil pump structure for the vehicle, characterized in that connected only to the discharge port is increased pressure.

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