WO2015160178A1

WO2015160178A1 - Variable oil pump

Info

Publication number: WO2015160178A1
Application number: PCT/KR2015/003757
Authority: WO
Inventors: 정현의
Original assignee: 명화공업주식회사
Priority date: 2014-04-15
Filing date: 2015-04-15
Publication date: 2015-10-22
Also published as: KR101505775B1

Abstract

The purpose of the present invention is to provide a variable oil pump, which comprises one chamber·two-way valve·three-way solenoid valve and enables pressure changes in two stages under two preset setting pressures, so as to supply a proper flow rate required for an engine and the like, at a high speed according to a speed (rotational speed) of the oil pump, thereby preventing an overload applied thereto and stably supplying oil. Particularly, another purpose of the present invention is to provide a variable oil pump, which enables the pressure thereof to be adjusted in two stages through one chamber·two-way valve·three-way solenoid valve capable of being manufactured using a normal technique, thereby having a simple structure, enabling pressure to be correctly adjusted in two stages, and being easily manufactured and used at a low cost.

Description

Variable oil pump

The present invention relates to a variable oil pump, and more particularly, by using one chamber, two-way valve, and three-way solenoid valve, the oil pressure discharged from the gallery can be varied in two stages according to the rotational speed of the variable oil pump. In this way, the structure is simple and easy to manufacture, and according to the rotational speed, the oil can be appropriately provided according to the required flow rate at the rotational site to improve cooling and lubrication.

In general, a variable oil pump is widely used to supply an oil required for cooling and lubrication in an engine of a vehicle. The variable oil pump reduces the load on the oil pump by supplying oil in proportion to the RPM in the low speed section and by reducing the unnecessary flow rate in the high speed section. Patent Documents 1 to 3 below disclose an oil pump of such a variable type.

Such a variable oil pump of Patent Document 1 includes a pump housing having a pivot; An out ring connected to the pivot to rotate about the pivot; An elastic body for providing a restoring force to the out ring; A rotor installed inside the out ring; A plurality of vanes radially installed on an outer circumference of the rotor; A cover for sealing the pump housing; and the engine oil sucked from the low pressure part of the inner circumference of the outer ring is sent to the high pressure part of the inner circumference of the outer ring through the compression section of the inner circumference of the outer ring. In forming a variable oil pump of a vehicle in which grooves are provided on the inner circumferential surface of the ring and an involute hole corresponding to the high pressure part is provided on the cover, an extension part extending to the suction end of the low pressure part is provided on one side of the groove of the out ring. It is characterized by.

Patent document 2 relates to a mechanical multi-stage variable vane pump for engine oil, and more particularly, to a mechanical multi-stage variable vane pump for engine oil having an improved structure so that the variable flow rate of the vane pump can be mechanically multistage.

In the variable oil pump of Patent Literature 3, it is located at an extended end of a cam ring whose position is changed so as to change oil inflow and discharge volume, and a control signal of an ECU that calculates oil discharge flow rate using oil pressure according to the engine speed. Since the piezoelectric element is further provided to raise or lower the extension stage by receiving the input, it is possible to implement a continuous variable control without breaking the rotation region of the engine so that the oil pump is matched to the optimum hydraulic pressure according to the required hydraulic pressure of the engine compared to the engine hydraulic pressure. This improves fuel economy by up to about 3% compared to other multi-stage controlled oil pumps.

However, the existing variable oil pump according to Patent Documents 1 to 3, the following problems occur.

(1) In general, the variable oil pump is a single-stage type, and the speed (speed) of the variable oil pump increases in proportion to the low to medium speed section, and provides a constant flow rate at a predetermined pressure in the medium to high speed section.

(2) However, the variable oil pump, like the oil pump of the vehicle, continues to operate at a medium speed while the vehicle is running, but requires a lot of oil in this medium speed section when the oil pressure is controlled in a single stage manner. Even if not, it actually provides more than the required flow rate. Thus, the single stage variable oil pump has a limitation in properly controlling the oil pressure in such a medium speed section.

(3) In particular, variable oil pumps vary the volume of the chamber for substantially regulating the oil pressure in the medium to high speed section, and since the variable flow rate is limited, in particular, the variable oil pump is generated in the variable oil pump at higher speeds. There is a limit to controlling the oil pressure.

(4) One or more chambers may be configured to control oil pressure. However, in the case of configuring a plurality of chambers as described above, not only the internal configuration of the oil pump is complicated, but also difficulty in manufacturing the variable oil pump.

(5) As such, the variable oil pump must endure the oil pressure more than necessary in the mid to high speed section, so if it is used for a long time in such a situation, there is a possibility that the oil cannot be supplied due to the breakdown of the variable oil pump due to the durability of the variable oil pump. there was.

Prior art literature

(Patent Document 1) Korean Patent Publication No. 10-2012-0053843 (published date: May 29, 2012)

(Patent Document 2) Korean Registered Patent No. 1301406 (Registration Date: 2013.08.22)

(Patent Document 3) Korean Patent Publication No. 10-2013-0056458 (2013.05.30)

The present invention has been invented in view of this point, by configuring one chamber, two-way valve and three-way solenoid valve in the variable oil pump, by making the pressure change in two stages at two preset pressures, The purpose of the present invention is to provide a variable oil pump that can supply oil at a high speed according to the speed (rotational speed) of the oil pump so that the oil can be stably supplied without overloading the variable oil pump. have.

In particular, the present invention allows the variable oil pump to be controlled in two stages through a single chamber, a two-way valve, and a three-way solenoid valve, which can be manufactured according to a conventional technique, thereby making the structure of the variable oil pump simple and accurate. Another object is to provide a variable oil pump that can be easily manufactured and used at low cost as well as adjustable in two stages.

The variable oil pump of the present invention for solving the above technical problem is a variable oil pump for outputting a multi-stage variable oil to a gallery with a plurality of pressures set differently in advance according to the speed change of the vehicle, according to the internal pressure of the gallery A variable pumping chamber in which a volume can be changed by an oil pressure in a chamber to flow in and out; A two-way valve having first to fourth ports W1 to W4; And a three-way solenoid valve having first to third ports P, A, and T, wherein the first ports P and W1 are connected to the gallery, and the second ports A and W2 are The third port T is configured to expose oil to the outside of the variable oil pump, and the third and fourth ports W3 and W4 are connected to the chamber.

Preferably, the variable oil pump may be configured to deliver the oil, which is varied in two stages with the first set pressure and the second set pressure, which are previously set differently according to the speed change of the vehicle, to the gallery.

Preferably, each port may be configured to be connected to P → A → W2 → W3 → chamber to increase the pressure when the pressure discharged from the variable oil pump is between 0 and the first set pressure.

Preferably, each port may be configured to be connected to P → A → W2 → W3 → chamber when the pressure discharged from the variable oil pump is a first set pressure section to maintain the first set pressure.

Preferably, each port is configured to be connected to the chamber → W3 → W2 → A → T → outside so as to be higher than the first set pressure when the pressure discharged from the variable oil pump is between the first set pressure and the second set pressure. Can be.

Preferably, each port may be configured to maintain the second set pressure by connecting to the chamber W1 → W4 → chamber if the pressure discharged from the variable oil pump is the second set pressure section.

Preferably, the variable pumping chamber may include a variable rotor, a slider surrounding the rotor to receive elastic support to change an internal volume, and a chamber to change the pumping space by rotating the slider by receiving oil. have.

Preferably, a check valve may be provided between the variable pumping chamber and the gallery to prevent the internal pressure of the gallery from rising above a predetermined pressure.

Variable oil pump according to the present invention has the following effects.

(1) Since the variable oil pump can adjust the oil pressure in two stages according to its rotation speed, it can supply properly according to the flow rate required by the rotating part.

(2) In this case, especially when a small amount of oil is required at a high speed, the flow rate can be adjusted accordingly, so that even if the variable oil pump operates at a high speed for a long time, the durability of the variable oil pump can be prevented from falling.

(3) The oil delivery pressure of the variable oil pump can be adjusted in two stages with the usual two-way valve and three-way solenoid valve. This can be easily manufactured and used without significantly increasing the manufacturing cost of the variable oil pump.

(4) By supplying the required oil using one gallery and controlling it in two stages, not only the internal structure of the variable oil pump can be easily formed but also within the limited space of the variable oil pump. It can increase the space utilization of.

1 is a conceptual diagram for showing the overall configuration of a variable oil pump according to the present invention.

Figure 2 is an enlarged view for showing the configuration of the variable pumping chamber for generating oil pressure in the variable oil pump according to the present invention.

3 to 6 is a conceptual diagram and graph for showing a state of controlling the oil pressure in two stages by driving the variable oil pump according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. Prior to this, terms or words used in the specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly define the concept of terms in order to best explain their invention. In accordance with the principle that it can be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

Therefore, the embodiments described in the specification and the configuration shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

(구성)(Configuration)

In the two-stage variable oil pump 10 according to the present invention, as shown in Figs. 1 and 2, the variable pumping chamber 100 for generating oil pressure, the oil pumped in the variable pumping chamber 100 is stably rotated Two-way valve 300 and three-way solenoid valve for shifting in two stages according to the speed (rotational speed) of the variable oil pump 10 by using the oil pressure sent from the gallery 200 to be supplied to the part ( 400).

Here, the gallery 200 is separated from the variable oil pump 10, as shown in FIG. 1, and is connected to the outlet side of the variable pumping chamber 100 to rotate oil discharged from the variable pumping chamber 100. It is a kind of chamber that can store a predetermined flow rate so that it can be reliably pumped at. The gallery 200 is formed at a place irrelevant to the variable oil pump 10 such as, for example, an engine cover, and stably supplies oil supplied from the outlet side of the variable oil pump 10 to the rotating part. It plays a role.

In addition, in the case of an engine, an engine means a component which requires oil for lubrication and cooling when the engine is driven, such as a shaft or a crankshaft camshaft.

Hereinafter, this configuration will be described in more detail.

1 and 2, the variable pumping chamber 100 is provided with a rotor 110 rotating therein, and is a kind of space for compressing oil by the rotation of the rotor 110. The rotor 110 is, for example, a conventional rotor for use in a variable oil pump that can rotate together at an engine speed and vary in volume.

In particular, the variable pumping chamber 100 is provided with a slider 120 for varying the substantial space for compressing the oil wrapped around the rotor 110. Slider 120, as shown in Figure 2, is installed so as to rotate in the variable pumping chamber 100 around the housing constituting the variable oil pump 10, at this time, the elastic support of the elastic spring 121 I install it.

In addition, a chamber 130 is formed between the inner surface of the variable pumping chamber 100 and the slider 120, as shown in FIGS. 1 and 2. In particular, the chamber 130 is supplied with oil flowing in and out according to the internal pressure of the gallery 200 to be described later, the oil of the variable pumping chamber 100 surrounding the rotor 110 by rotating the slider 120 To vary the volume.

In a preferred embodiment of the present invention, if the internal pressure of the gallery 200 is higher than the set pressure between the gallery 200 and the variable pumping chamber 100 in addition to the passage for discharging oil to the outside of the actual variable oil pump 10. It is preferable to further configure the check valve 210 to maintain the pressure. The check valve 210 may return the abnormal pressure of the gallery 200 higher than the set pressure to the oil pan 500 that supplies oil to the variable oil pump 10, as shown in FIG. 1. In FIG. 1, the check valve 210 illustratively shows a ball check valve.

Since the configuration of the variable pumping chamber 100 is the same as that already configured in the conventional variable oil pump 10, a detailed description thereof will be omitted.

The two-way valve 300 is a valve for selectively applying the internal pressure of the gallery 200 to the chamber 130 or removing the pressure in the chamber 130 as shown in FIG. 1. In particular, in the present invention, a valve having four first to fourth ports W1 to W4 is used as the two-way valve 300. At this time, the first port (W1) is connected to the gallery 200 can be configured to selectively supply oil to the fourth port (W4), the second port (W2) and the three-way solenoid valve 400 to be described later Connect and configure internally through the third port (W3).

In a preferred embodiment of the present invention, the two-way valve 300 is a switching valve manufactured by a conventional technique, may be mounted on the housing of the variable oil pump according to the present invention, or embedded in the variable oil pump It can also be formed integrally as a type.

The three-way solenoid valve 400 uses what was manufactured by the conventional technique which has three 1st-3rd port P, A, T as shown in FIG. At this time, the first port (P) is connected to the gallery 200, the second port (A) is connected to the second port (W2) of the two-way valve 300 described above, the third port (T) is It is selectively connected to the second port (A) is configured to discharge the oil supplied through the second port (W2) to the outside of the variable oil pump according to the present invention.

(작동)(work)

Hereinafter, the operation of the two-stage variable oil pump 10 using the one chamber and the two-way valve according to the present invention will be described with reference to FIGS. 3 to 6 and the two-way valve 300 and the three-way solenoid valve 400. The following description will focus on.

Here, the operation is the pressure to be sent to the gallery 200 according to the rotational speed of the rotor 110, the pressure at this time to the second stage of the first predetermined pressure (P1) and the second predetermined pressure (P2) predetermined. The description is divided into four sections as follows.

In the first section, as shown in the graph of FIG. 3, the delivery pressure is a section between “0” and the first set pressure P1. That is, when the rotor 110 rotates for the first time, the pressure gradually rises from "0", and the pressure at this time is proportional to the rotational speed of the rotor 110.

Accordingly, the oil generated in the variable pumping chamber 100 is pumped to the gallery 200 and supplied to the required rotating part to cool and lubricate. At this time, a part of the oil supplied to the gallery 200 is supplied to the chamber 130. That is, the oil is passed through the second port W2 and the third port W3 of the two-way valve 300 through the first port P and the second port A of the three-way solenoid valve 400. Supply to the chamber 130. The oil supplied in this way gradually rises with the increase in the pressure of the gallery 200, but does not overcome the elastic force of the elastic spring 121 supporting the slider 120, so that the volume of the chamber 130 does not change. The pressure increases in a solid line as shown in the graph.

Here, the same pressure as the gallery 200 also acts on the first port W1 of the two-way valve 300, but the pressure is weak and is not supplied to the fourth port W4.

The second section is a section in which the delivery pressure is equal to the first set pressure P1, as indicated by the solid line in the graph of FIG. That is, as the speed at which the rotor 110 rotates increases, the pressure to be sent to the gallery 200 also increases. At this time, the pressure is greater than the elastic force of the elastic spring 121 to rotate the slider 120.

As such, when the slider 120 rotates, the volume of the variable pumping chamber 100 is reduced, and thus, the first preset pressure P1 is maintained while preventing the increase in the pressure sent to the gallery 200 in proportion thereto.

That is, in this section, as the speed of the rotor 110 increases, the pressure must be higher than the first set pressure P1, but the pressure increases as the volume of the variable pumping chamber 100 decreases due to the rotation of the slider 120. The first set pressure P1 is maintained.

At this time, the oil is the second port (2) of the two-way valve 300 through the first port (P) and the second port (A) of the three-way solenoid valve 400, as shown in FIG. It is supplied to the chamber 130 through the W2) and the third port (W3). And, the difference with the first section is to rotate the slider 120 while winning the elastic force of the elastic spring 121 as described above.

In a third section, as shown in FIG. 5, the pressure is maintained between the first set pressure P1 and the second set pressure P2. This in turn reduces the internal pressure of the chamber 130 to increase the oil pressure of the gallery 200 as the rotor 110 rotates at a faster speed than the second section. That is, when the pressure in the chamber 130 is reduced to be weaker than the elastic force of the elastic spring 121, the elastic spring 121 rotates the slider 120 to increase the volume of the variable pumping chamber 100, thereby increasing the oil pressure. Increase it.

At this time, the oil flow is discharged to the third port (W3) → second port (W2) → three-way solenoid valve (100) → outside of the chamber (130) → two-way valve (300). . Here, "outside" means outside the variable oil pump according to the present invention, and preferably returns to the oil pan 500 for storing oil.

As the pressure in the chamber 130 is removed, the slider 120 is returned to its original position by the elastic force of the elastic spring 121, thereby expanding the volume of the variable pumping chamber 100 to increase the oil pressure as shown in the solid line portion of the graph of FIG. 5. Increase

The fourth section is a section for maintaining the second set pressure P2 as shown in FIG. 6. This is done by supplying the oil of the gallery 200 to the chamber 130. That is, as the oil pressure increases in the third section, the oil pressure is applied to the first port W1 of the two-way valve 300 to connect the fourth port W4.

Accordingly, the oil is supplied from the gallery 200 to the chamber 130 and is larger than the elastic force of the elastic spring 121, thereby rotating the slider 120 to change the volume of the variable pumping chamber 140 to change the volume of the second set pressure P2. Keep it.

As described above, the present invention is simple in structure and can be made smooth lubrication and cooling in the rotating portion through a predetermined two-stage pressure change.

Claims

It is a variable oil pump that sends oil to the gallery with multiple stages of variable pressure set in advance according to the speed change of the vehicle.

A variable pumping chamber in which a volume can be changed by oil pressure in a chamber flowing in and out according to the internal pressure of the gallery;

A two-way valve having first to fourth ports W1 to W4; And

Three-way solenoid valve having a first to third ports (P, A, T),

The first ports P and W1 are connected to the gallery, the second ports A and W2 are connected to each other, and the third port T is capable of exposing oil to the outside of the variable oil pump. And the third and fourth ports (W3, W4) are configured to be connected to the chamber.
The method of claim 1,

The variable oil pump,

The variable oil pump, characterized in that configured to send to the gallery the oil which is variable in two stages by the first set pressure and the second set pressure previously set differently according to the speed change of the vehicle.
The method of claim 2,

Each port is

The variable oil pump, characterized in that configured to increase the pressure by connecting to the P → A → W2 → W3 → chamber if the pressure sent from the variable oil pump is between 0 and the first set pressure.
The method of claim 2,

Each port is

The variable oil pump, characterized in that configured to maintain the first set pressure by connecting to the P → A → W2 → W3 → chamber if the pressure discharged from the variable oil pump is the first set pressure section.
The method of claim 2,

Each port is

The variable oil pump, characterized in that configured to be higher than the first set pressure by connecting the chamber → W3 → W2 → A → T → outside when the pressure sent from the variable oil pump is between the first set pressure and the second set pressure.
The method of claim 2,

Each port is

The variable oil pump, characterized in that configured to maintain the second set pressure by connecting to the chamber W1 → W4 → chamber when the pressure sent from the variable oil pump is a second set pressure section.
The method of claim 1,

The variable pumping chamber,

A variable oil pump comprising a variable rotor, a slider surrounding the rotor to receive elastic support to change an internal volume, and a chamber to rotate the slider to receive oil to change a pumping space.
The method of claim 1,

Between the variable pumping chamber and the gallery,

And a check valve for preventing the internal pressure of the gallery from rising above a preset pressure.