KR101505775B1 - 2-stage variable displacement oil pump using one chamber and one two-way valve - Google Patents

Abstract

The purpose of the present invention is to provide a 2-stage variable oil pump using a chamber and a two-way valve, in which the chamber, the two-way valve, and a three-way solenoid valve is configured in a variable oil pump, and which changes pressure in two stages in predetermined two setting pressures to supply a proper flow required by an engine or the like even at high speed according to the speed (rotation speed) of the oil pump, thereby preventing overload on the variable oil pump and stably supplying oil. Especially, another purpose of the present invention is to provide a 2-stage variable oil pump using a chamber and a two-way valve, which adjusts the pressure of the variable oil pump in two stages through the chamber, the two-way valve, and a three-way solenoid valve which may be manufactured by conventional techniques, thereby simplifying the structure of the variable oil pump, adjusting accurately the pressure in two stages, and being easily manufactured at a low cost.

Description

(2-STAGE VARIABLE DISPLACEMENT OIL PUMP USING ONE CHAMBER AND ONE TWO-WAY VALVE)

The present invention relates to a two-stage variable oil pump using one chamber and a two-way valve, and more particularly to a two-stage variable oil pump using one chamber, two-way valve, and three-way solenoid valve, By making it possible to vary the oil pressure to be discharged in two stages, it is possible to easily manufacture the structure, and it is possible to easily manufacture the oil according to the required flow rate at the rotating portion according to the rotating speed, .

Generally, a variable oil pump is widely used to supply the oil required for cooling and lubrication in a vehicle engine. The variable oil pump supplies the oil proportional to the RPM when the speed (RPM) is low, and reduces the load on the oil pump by reducing the unnecessary flow when the speed is low. In the following Patent Documents 1 to 3, such a variable-type oil pump is disclosed.

This variable oil pump of Patent Document 1 includes: a pump housing having a pivot; An out ring connected to the pivot so as 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 periphery of the rotor; The engine oil sucked by the low pressure portion of the inner circumference of the out ring is sent to the high pressure portion of the other side of the inner circumference of the out ring through the compression section of the center of the inner circumference of the out ring, A variable oil pump for a vehicle having grooves on the inner circumferential surface of the ring and involute holes corresponding to the high pressure portion of the cover is provided, and an extension portion extending to the suction end of the low pressure portion is provided on one side of the groove of the out ring .

Patent Document 2 relates to a mechanical multi-stage variable vane pump for engine oil, and more specifically, to a multi-stage variable mechanical vane pump for engine oil which improves the structure so that the variable flow rate of the vane pump can be mechanically varied.

The variable oil pump disclosed in Patent Document 3 is located at the extended end of the cam ring whose position is changed so as to change the oil inflow and discharge volume, and the control signal of the ECU for calculating the oil discharge flow rate using the oil pressure corresponding to the engine speed And a piezoelectric element for lifting or lowering the extension end by receiving the oil pressure of the oil pump, so that continuous variable control can be implemented without any interruption to the rotation region of the engine so that the oil pump is matched to the optimum oil pressure in accordance with the engine- , Which improves fuel economy by up to about 3% compared to other multi-stage control type oil pumps.

However, the conventional variable oil pumps according to Patent Documents 1 to 3 have the following problems.

(1) Normally, the variable oil pump is a one-stage type in which the flow rate is increased in proportion to the number of revolutions (speed) in the middle-speed range, and a constant flow rate is provided in a predetermined speed in the middle-speed range.

(2) However, the variable oil pump, like the oil pump of a vehicle, keeps running at a medium speed when the vehicle is running. If the oil pressure is controlled in a one-stroke manner, a lot of oil is required But it actually provides more than the required flow rate. Thus, the first-stage variable oil pump has a limitation in properly controlling the oil pressure in the middle-speed section.

(3) In particular, the variable oil pump varies the volume of the chamber for controlling the oil pressure substantially in the middle speed range. Since the variable oil pump has a limited flow rate, the variable oil pump occurs in the variable oil pump There is a limit in controlling the oil pressure.

(4) One or more chambers may be used to control the oil pressure. However, when such a chamber is constituted as described above, not only the internal structure of the oil pump is complicated, but also difficulties in manufacturing a variable oil pump.

(5) Since the variable oil pump is required to withstand more than the necessary oil pressure in the middle speed range, there is a possibility that the variable oil pump can not supply oil due to the damage of the variable oil pump due to the durability of the variable oil pump. there was.

Korean Published Patent No. 10-2012-0053843 (public date: May 29, 2012) Korean Registered Patent No. 1301406 (Registered on 2013.08.22) Korean Patent Publication No. 10-2013-0056458 (2013.05.30)

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a variable oil pump in which one chamber, two-port valve and three-port solenoid valve are constituted, According to the speed (rotation speed) of the oil pump, it is possible to supply an appropriate flow rate required by the engine even at high speed, so that a stable chamber can be supplied without overloading the variable oil pump. However, the purpose is to provide a variable oil pump.

Particularly, the present invention can control the variable oil pump in two stages through one chamber, two-way valve, and three-way solenoid valve which can be manufactured by the conventional technique, so that the structure of the variable oil pump is simple and precise It is another object to provide a two-stage variable oil pump using a two-chamber valve and a single chamber which can be easily manufactured and used at low cost as well as controlling the pressure in two stages.

A variable oil pump for sending an oil, which has been varied in two stages with a first set pressure (P1) and a second set pressure (P2) set differently according to a speed change of a vehicle, to a gallery (200) A slider 120 that elastically supports the rotor 110 to change an internal volume of the rotor 110 and a chamber 130 that receives oil and rotates the slider 120 to change a pumping space, A seal 100; A two-way valve 300 having first to fourth ports W1 to W4; And a three-way solenoid valve (400) having first to third ports (P, A, T), the first port (P, W1) being connected to the gallery (200) And the third and fourth ports W3 and W4 are connected to the chamber 130. The first and second ports A and W2 are connected to each other and the third port T exposes the oil to the outside of the variable oil pump, And each port is connected to a chamber P → A → W 2 → W 3 → if the pressure to be delivered from the variable oil pump is between 0 and the first set pressure, and if the pressure is in the first set pressure interval The pressure of the chamber 130 is maintained to be maintained in the chamber 130 when the pressure is between the first set pressure P1 and the second set pressure P2. W3 → W2 → A → T → to make it higher than the first set pressure P1 and when the pressure is within the second set pressure P2, W1 → W4 → connect to the chamber 130, To maintain the pressure P2 .

Particularly, a check valve 210 is provided between the variable pumping chamber 100 and the gallery 200 so that the internal pressure of the gallery 200 does not rise above a preset pressure.

The two-stage variable oil pump using one chamber and two-way valve according to the present invention has the following effects.

(1) The variable oil pump can adjust the oil pressure in two stages according to its rotational speed, so that it can supply properly according to the flow rate required in the rotating part.

(2) In particular, when a small amount of oil is required in the middle of the engine, the flow rate can be adjusted accordingly, so that the durability of the variable oil pump can be prevented even if the variable oil pump operates for a long time.

(3) The oil delivery pressure of the variable oil pump can be adjusted in two stages by the normal two-way valve and the three-way solenoid valve. Therefore, it is possible to easily manufacture and use the variable oil pump without increasing the manufacturing cost of the variable oil pump.

(4) Since the required oil can be supplied using a single gallery, and the oil can be controlled by these two stages, not only the internal structure of the variable oil pump can be easily formed, The space utilization of the user can be increased.

FIG. 1 is a conceptual diagram showing an overall configuration of a variable oil pump according to the present invention. FIG.
2 is an enlarged view showing a configuration of a variable pumping chamber for generating oil pressure in a variable oil pump according to the present invention;
3 to 6 are a conceptual diagram and a graph for showing a state in which the oil pressure is controlled in two stages by driving the variable oil pump according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should properly define the concept of the term to describe its invention in the best possible way The present invention should be construed in accordance with the spirit and scope of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Thus, various equivalents And variations may be present.

(Configuration)

1 and 2, the two-stage variable oil pump 10 according to the present invention includes a variable pumping chamber 100 for generating an oil pressure, A two-way valve 300 and a three-way solenoid valve (not shown) for shifting to two-stage according to the speed (rotation speed) of the variable oil pump 10 by using the oil pressure sent from the gallery 200 400).

1, the gallery 200 is separated from the variable oil pump 10 and is connected to the outlet side of the variable pumping chamber 100 to rotate the oil generated in the variable pumping chamber 100, Which is a kind of chamber capable of storing a predetermined flow rate so that it can be stably pressed and fed. The gallery 200 is formed at a position which is not related to the variable oil pump 10 such as an engine cover. The gallery 200 stably supplies the oil supplied from the outlet side of the variable oil pump 10 to the rotating portion It is the role of

The term "rotating portion" as used herein means a component that 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 as follows.

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

Particularly, the variable pumping chamber 100 is provided with a slider 120 that covers the rotor 110 and varies a substantial space for compressing the oil. 2, the slider 120 is installed so as to be rotatable in the variable pumping chamber 100 around one side of the housing constituting the variable oil pump 10, and at this time, the elastic support of the elastic spring 121 .

Between the inner surface of the variable pumping chamber 100 and the slider 120, a chamber 130 is formed as shown in FIGS. 1 and 2. Particularly, the chamber 130 is supplied with oil flowing in and out according to the internal pressure of the gallery 200, which will be described later. The oil is supplied to the variable pumping chamber 100 surrounding the rotor 110 by rotating the slider 120 Variable volume.

In the preferred embodiment of the present invention, when the internal pressure of the gallery 200 is equal to or higher than the set pressure, in addition to the passage for discharging the oil to the outside of the actual variable oil pump 10 between the gallery 200 and the variable pumping chamber 100, It is preferable to further configure the check valve 210 so as to maintain the pressure. The check valve 210 makes it possible to return the abnormal pressure of the gallery 200 higher than the set pressure to the oil pan 500 or the like that supplies oil to the variable oil pump 10 as shown in Fig. In Figure 1, the check valve 210 is illustratively shown as an example of a ball check valve.

Since the configuration of the variable pumping chamber 100 is the same as that of the conventional variable oil pump 10, 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. In the present invention, as the two-way valve 300, a valve having four first to fourth ports W1 to W4 is used. The first port W1 is connected to the gallery 200 to selectively supply oil to the fourth port W4 and the second port W2 is connected to the three-way solenoid valve 400 And is internally connected to the third port (W3).

In the preferred embodiment of the present invention, the two-way valve 300 is a switching valve manufactured by a conventional technique, and may be constructed by being attached to a housing of a variable oil pump according to the present invention, Or may be integrally formed as a type.

As shown in Fig. 1, the three-way solenoid valve 400 is made by a conventional technique having three first to third ports P, A, and T. [ In this case, 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, And the oil that is selectively connected to the second port (A) and supplied through the second port (W2) is configured to be discharged to the outside of the variable oil pump according to the present invention.

(work)

The operation of the two-stage variable oil pump 10 using one chamber and the two-way valve according to the present invention will now be described with reference to FIGS. 3 to 6, using the two-way valve 300 and the three-way solenoid valve 400, As shown in FIG.

Here, the operation differs depending on the rotational speed of the rotor 110, and the pressure to be sent to the gallery 200 is different. In this case, the pressure at this time is divided into two stages of the first set pressure P1 and the second set pressure P2 In order to be able to change it, it is divided into four sections as follows.

The first period is, as shown in the graph of Fig. 3, the interval between the delivery pressure "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 fed to the gallery 200, and supplied to the necessary rotating parts 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 flows 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 To the chamber (130). Since the oil supplied in this way increases gradually with the pressure of the gallery 200 but does not overcome the elastic force of the elastic spring 121 supporting the slider 120, there is no change in the volume of the chamber 130, As shown in the graph, the pressure increases in a solid line.

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

The second period is a period in which the delivery pressure becomes equal to the first set pressure P1 as indicated by a 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 larger than the elastic force of the elastic spring 121, thereby rotating the slider 120.

When the slider 120 rotates as described above, the volume of the variable pumping chamber 100 is reduced, and the first set pressure P1 is maintained while preventing the pressure to be sent to the gallery 200 from increasing in proportion thereto.

That is, in this interval, as the speed of the rotor 110 increases, the pressure of the variable pumping chamber 100 must be higher than the first set pressure P1. However, since the volume of the variable pumping chamber 100 is decreased due to the rotation of the slider 120, And the first set pressure P1 is maintained.

At this time, the oil flows through the first port P of the three-way solenoid valve 400 and the second port A of the two-way valve 300 through the second port A, as in the case of FIG. W2 and the third port W3. The difference from the first section is that the slider 120 is rotated by overcoming the elastic force of the elastic spring 121 as described above.

The third period is a step for maintaining the pressure between the first set pressure P1 and the second set pressure P2 as shown in Fig. Which 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 rate than the second section. When the elastic spring 121 rotates the slider 120 to widen the volume of the variable pumping chamber 100, if the pressure in the chamber 130 is reduced to be lower than the elastic force of the elastic spring 121, Increase.

The oil flow at this time is discharged from the chamber 130 to the third port W3 of the two-way valve 300, the second port W2, and the third port T of the three-way solenoid valve 100 . Here, "outside" means outside the variable oil pump according to the present invention, and it is preferable to return to the oil pan 500 for storing the oil.

As the pressure in the chamber 130 is removed as described above, the slider 120 is returned to its original position by the elastic force of the elastic spring 121, thereby widening the volume of the variable pumping chamber 100, .

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

The oil is supplied from the gallery 200 to the chamber 130 to be larger than the elastic force of the elastic spring 121 and the slider 120 is rotated to change the volume of the variable pumping chamber 140 to the second set pressure P2 state Lt; / RTI >

As described above, according to the present invention, the structure is simple, and stable lubrication and cooling can be performed at the rotating portion through a preset two-step pressure change.

100: variable pumping chamber
200: Gallery
210: Check valve
300: Two-way valve
400: 3-room solenoid valve

Claims (2)

A variable oil pump for sending oil to a gallery (200) which is varied in two steps by a first set pressure (P1) and a second set pressure (P2) set differently according to a speed change of the vehicle,
A slider 120 that elastically supports the rotor 110 to change its internal volume; a chamber 130 that receives oil and rotates the slider 120 to change the pumping space; A variable pumping chamber (100) having an inlet port A two-way valve 300 having first to fourth ports W1 to W4; And a three-way solenoid valve (400) having first to third ports (P, A, T)
The first port (P, W1) is connected to the gallery (200)
The second ports A and W2 are connected to each other,
The third port T allows oil to be exposed to the outside of the variable oil pump,
The third and fourth ports W3 and W4 are connected to the chamber 130,
Each of the ports is connected to the chamber through a path P → A → W2 → W3 → if the pressure to be delivered from the variable oil pump is between 0 and the first set pressure, and if the pressure is in the first set pressure interval, P → A W3 → W3 → chamber to maintain the pressure at the first set pressure P1 and if the pressure is between the first set pressure P1 and the second set pressure P2, the chamber 130 → W3 → W2 → A → T → to be higher than the first set pressure P1 and when the pressure is within the second set pressure P2, W1 → W4 → connected to the chamber 130 and the second set pressure P2 ) Of the two-stage variable oil pump using one chamber and two-way valve.
The method according to claim 1,
Characterized in that a check valve (210) is provided between the variable pumping chamber (100) and the gallery (200) to prevent the internal pressure of the gallery (200) from rising above a preset pressure. Two-stage variable oil pump with valve.

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