KR101684108B1

KR101684108B1 - Oil pump for car engine

Info

Publication number: KR101684108B1
Application number: KR1020150064522A
Authority: KR
Inventors: 문승동
Original assignee: 현대자동차주식회사
Priority date: 2015-05-08
Filing date: 2015-05-08
Publication date: 2016-12-07
Also published as: KR20160131644A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oil pump that sucks and pressurizes oil in an oil pan to deliver oil to a part where lubrication and cooling are required.
The present invention realizes a durability equivalent to that of a mechanical oil pump by implementing a new type of oil pump that variably adjusts a discharge flow rate by a mechanical mechanism by applying a dual chamber and a dual rotor type, The present invention provides an oil pump for an automobile engine that is advantageous in terms of price and can achieve the same level of improvement in fuel economy.

Description

[0001] Oil pump for car engine [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump for an automobile engine, and more particularly, to an oil pump that sucks and pressurizes oil in an oil pan to deliver oil to a site where lubrication and cooling are required.

Generally, an engine oil pump is a device that supplies lubricating oil to a friction portion of an engine to smooth the operation of the engine.

Generally, an oil pump is composed of pumps for generating a high pressure such as a rotary pump, a gear pump, and a vane pump in order to pressurize the oil in the oil pan, which is a container in which oil is stored, Among the gear pumps, an internal gear pump is mainly used.

1, a chamber 110 is formed in a case 100, two rotors 120a and 120b are installed in the chamber 110, The rotors 120a and 120b are engaged with each other by rotational movement of gears to suck and pressurize oil to supply oil to the engine.

Here, reference numeral 130 denotes a cover, and reference numeral 140 denotes a gear for driving the rotor.

However, in the conventional internal gear pump, the rotor size (width) of the oil pump increases with an increase in the capacity of the oil required by the engine as the engine becomes more powerful. As a result, the size of the rotor increases, And there is a disadvantage that fuel efficiency is bad.

Recently, fuel efficiency improvement and eco-friendliness have become key items for vehicle development due to high oil price and CO ₂ regulations. In order to achieve this goal, we are concentrating on developing technologies for fuel reduction.

Improvement of the driving torque of the engine is essential for improving the fuel efficiency. As a technique for improving the loss of the oil pump, a variable displacement type oil pump technique for adjusting the discharge flow rate according to the required amount is used.

However, the conventional variable displacement oil pump has a disadvantage in that the circuit is considerably complicated, expensive, and lacks in durability compared to the conventional mechanical oil pump.

BACKGROUND ART [0002] Techniques that serve as the background of the present invention are disclosed in Korean Patent Laid-Open Nos. 10-2002-0001132, Korean Patent Laid-Open Nos. 10-2012-0010449 and 10-2012-0000232.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a new type of oil pump that adjusts a discharge flow rate variably by a mechanical mechanism by applying a dual chamber and a dual rotor type, And it is an object of the present invention to provide an oil pump of an automobile engine which is advantageous in terms of price compared to a variable oil pump and can achieve an equal level of fuel economy improvement effect.

In order to achieve the above object, the oil pump of the automobile engine provided in the present invention has the following features.

The oil pump of the automobile engine is provided with chambers each having an intake port and a discharge port on both sides of the case, and a pair of rotors are provided in the chambers, and the rotors in the chambers are rotated And the oil is supplied to the engine by sucking and pressurizing the oil.

Therefore, the oil pump of the automobile engine has both advantages of the variable oil pump and the advantages of the mechanical oil pump, thereby ensuring durability and improving fuel economy and cost.

Here, the oil pump of the automobile engine is provided with a solenoid valve, for example, a proportional-control solenoid valve which is provided at any one of the discharge ports extending from each chamber and is opened or closed by the output control of the control unit to adjust the amount of oil to be delivered .

In the case of the solenoid valve, the solenoid valve can be turned ON during warm-up, so that all the oil sent out from the two rotors can be supplied to the engine. In the cold state, So that the delivered oil can be supplied to the engine.

The oil pump of the automobile engine provided in the present invention has the following advantages.

First, it has the same level of durability as a mechanical oil pump.

Second, it has the same level of fuel economy improvement as a variable oil pump, and it is advantageous in terms of price.

Third, we can actively cope with the recent intensifying oil price and CO ₂ regulations.

1 is a perspective view showing a conventional mechanical oil pump;
2 is a schematic view showing the concept of an oil pump according to an embodiment of the present invention;
3 is a perspective view showing an oil pump according to an embodiment of the present invention.
4 is a perspective view showing an operating state of the oil pump according to the embodiment of the present invention;
5 is a graph showing a control method of the oil pump according to the embodiment of the present invention.

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

2 is a schematic view showing the concept of an oil pump according to an embodiment of the present invention.

As shown in FIG. 2, the oil pump is a combination of a mechanical type and a variable type, and has a structure capable of ensuring a sufficient durability while varying the discharge flow rate according to a required amount.

The oil pump includes two chambers 11a and 11b formed in the case 10. Two chambers 11a and 11b are provided with two suction ports 15a and 15b for oil inflow, Or two suction side lines are connected and two discharge ports 16a, 16b for oil discharge or two discharge side lines are connected.

A solenoid valve 19 is installed in any one of the two discharge ports 16a and 16b extending from the respective chambers 11a and 11b or one discharge port 16a or 16b of the discharge side line.

For example, a solenoid valve 19 is provided in the discharge port 16b extending from the chamber 11b.

The solenoid valve 19 is opened and closed by an output control signal of a control unit (not shown), which inputs the operating state and operating conditions of the engine, that is, from the chamber 11b The amount of oil to be delivered can be controlled or interrupted.

Here, the solenoid valve 19 may be constituted by a proportional control solenoid valve, for example, so that all the oil delivered from the chamber 11b is supplied to the engine, or the oil delivery from the chamber 11b is stopped (In this case, it is preferable to shut off the power to the rotor side in the chamber under the control of the control section), or the amount of oil delivered from the chamber 11b can be supplied while being variably controlled.

The suction ports 15a and 15b connected to the respective chambers 11a and 11b are connected to the oil strainer 18 so as to be able to receive oil and are connected to the discharge ports 15a and 15b extending from the chambers 11a and 11b. The oil outlets 16a and 16b are connected to the oil out pipe 17 side so that oil can be supplied to the engine side.

Accordingly, all or a part of the oil sent out from the two rotors 12a and 12b can be supplied to the engine depending on whether the solenoid valve 19 opened or closed by the control unit is turned on or off.

For example, when the warm-time solenoid valve 19 is turned ON, all the oil sent out from the two rotors 12a and 12b can be supplied to the engine.

In addition, the cold-time solenoid valve 19 is turned off so that oil sent out from one rotor 12a or 12b out of the two rotors 12a and 12b can be supplied to the engine.

3 is a perspective view showing an oil pump according to an embodiment of the present invention.

3, chambers 11a and 11b are formed on both sides of the case 10, and suction ports 15a and 15b are provided in the chambers 11a and 11b, respectively. And discharge ports 16a and 16b are formed.

That is, the suction ports 15a and 15b are formed to communicate with one side space of the chambers 11a and 11b with respect to the rotors 12a and 12b, and the discharge ports 16a and 16b are connected to the chambers 11a and 11b, 11b.

This allows the oil introduced into one space of the chambers 11a and 11b through the suction ports 15a and 15b by the engagement operation of the rotors 12a and 12b to be supplied to the discharge ports 16a and 16b You will be able to escape through.

Here, the chambers 11a and 11b may have a structure communicating with each other, or may have independent structures.

Each of the chambers 11a and 11b is provided with a pair of rotors 12a and 12b which are rotatable about their own axes so as to be engaged with each other and are rotatably supported by the rotor shaft extending and projecting toward the rear side of the case 10 And the rotor driving gears 14a and 14b are respectively mounted.

At this time, the rotor driving gears 14a and 14b are rotated by receiving power from the engine side and are operated in the same manner as a conventional gear for driving the rotor, so a detailed description thereof will be omitted.

In addition, the front surface of the case 10 is closed by a cover (reference numeral 13 in FIG. 4), and suction ports 15a and 15b for sucking and discharging the oil are formed in the cover 13, And discharge ports 16a and 16b are formed, respectively.

Accordingly, the rotors 12a and 12b installed in the respective chambers 11a and 11b are engaged with each other by the rotational movement of the gears to suck and pressurize the oil, so that the oil delivered from the chambers 11a and 11b So that it can be supplied to the engine.

On the other hand, the rotors 12a and 12b can have a relatively small width as compared with the conventional rotor.

For example, the width of the conventional rotor and the width of the rotor of the present invention can be made at a ratio of 1: 0.5.

Thus, by using two small rotors of the rotor width, the drive torque can be reduced and improved.

That is, when the rotor width is increased in order to increase the pump capacity, it is difficult to manufacture a product having a diameter of 60 mm or more as a sintering material. However, by using a rotor having a small rotor width, the constraint of increasing the pump capacity can be solved.

Therefore, the pump capacity can be doubled as compared with the conventional oil pump structure.

4 is a perspective view showing an operating state of an oil pump according to an embodiment of the present invention.

As shown in Fig. 4, here, the flow of the oil delivered from each of the chambers 11a and 11b is shown.

The oil that has entered the suction port 15a of the chamber 11a by the engagement operation of the rotor 12a in the one chamber 11a is discharged to the discharge port 16a via the chamber 11a, And the oil introduced into the suction port 15b of the chamber 11b by the engagement operation of the rotor 12b in the other chamber 11b is discharged through the chamber 11b Port 16b.

5 is a graph illustrating a control method of an oil pump according to an embodiment of the present invention.

As shown in FIG. 5, when the vehicle is in the low pressure mode, the oil is delivered from only one chamber. If the high pressure mode section is reached, the flow rate of the remaining one chamber oil is increased to meet the required flow rate in the high speed section The same effect as that of the control oil pump can be obtained.

That is, in the low-pressure mode section, only one chamber of the two chambers is operated to send oil, and in the high-pressure mode section, both chambers are operated to transmit the oil.

By controlling the oil discharge amount of the one chamber, it is possible to obtain the same effect as that of the variable oil pump, and the fuel efficiency gain section can be obtained by the portion indicated by the gray region in the graph.

As described above, in the present invention, by implementing a mechanical variable oil pump having two chambers and two pairs of rotors, it is possible to secure durability equivalent to that of a conventional mechanical oil pump, and it is advantageous in terms of price and is equivalent to a conventional variable oil pump Fuel efficiency can be improved. In particular, it is possible to increase the pump capacity required in a high-output engine without restricting the increase of the oil pump capacity.

10: Case
11a, 11b: chambers
12a, 12b: rotor
13: cover
14a and 14b: gears for driving the rotor
15a, 15b: suction port
16a and 16b:
17: Oil out pipe
18: Oil Strainer
19: Solenoid valve

Claims

The chambers 11a and 11b having the suction ports 15a and 15b and the discharge ports 16a and 16b are formed on both sides of the case 10 and the chambers 11a and 11b are provided with a pair of rotors And the rotors 12a and 12b in the respective chambers 11a and 11b are engaged with each other by rotational movement of the gears to suck and pressurize the oil to supply the oil to the engine.
A solenoid valve 19 (not shown) which is provided on any one of the discharge ports 16a and 16b out of the discharge ports 16a and 16b extending from the chambers 11a and 11b and which is opened and closed by the output control of the control unit, Further comprising: an oil pump connected to the oil pump.

delete

The method according to claim 1,
Wherein the solenoid valve (19) is turned on when the solenoid valve (19) is warmed, so that all the oil sent out from the two rotors (12a, 12b) can be supplied to the engine.

The method according to claim 1,
The solenoid valve 19 is operated to be turned off in cold state so that oil sent out from one rotor 12a or 12b out of the two rotors 12a and 12b can be supplied to the engine. Oil pump.

The method according to claim 1,
Characterized in that the solenoid valve (19) comprises a proportional control solenoid valve.