Oil control valve for controlling a cam phaser with a spool positioned by an external actuator and including a groove
阅读说明:本技术 具有由外部执行器定位且包括凹槽的阀芯的用于控制凸轮相位器的油控制阀 (Oil control valve for controlling a cam phaser with a spool positioned by an external actuator and including a groove ) 是由 丹尼尔·斯坦霍普 于 2018-09-18 设计创作,主要内容包括:一种用于内燃机的凸轮相位器的油控制阀,其中阀芯由外部致动器定位。该阀包括阀芯组件,该阀芯组件包括能够在中心开口中轴向地移动的阀芯,并且在阀芯中存在至少一个凹槽。当打开时,该凹槽显著地增加了通过液压阀的流体流量。通过控制凹槽的尺寸和位置,可以控制流体流量的量。通过控制阀芯中的孔的尺寸,可以进一步控制流体流量。与不存在至少一个凹槽的情况相比,可归因于凹槽的流体流量的增加可为至少50%、100%或甚至200%。(An oil control valve for a cam phaser of an internal combustion engine in which a spool is positioned by an external actuator. The valve includes a spool assembly including a spool axially movable in a central opening and there is at least one groove in the spool. When open, the groove significantly increases the fluid flow through the hydraulic valve. By controlling the size and location of the grooves, the amount of fluid flow can be controlled. By controlling the size of the orifice in the valve spool, fluid flow can be further controlled. The increase in fluid flow attributable to the grooves may be at least 50%, 100%, or even 200% as compared to the absence of the at least one groove.)
1. A hydraulic valve for a cam phaser, comprising:
a valve cartridge assembly including a valve cartridge axially movable in a central opening of a valve housing; and
at least one groove on the outside of the valve core,
wherein the valve core assembly has at least a first position, a second position corresponding to the retaining position, and a third position,
wherein when the valve core assembly is in the first position or the third position, fluid flows through the hydraulic valve, and
wherein the at least one groove substantially increases fluid flow through the hydraulic valve when the at least one groove is opened in the first position or the third position or both the first position and the third position.
2. The hydraulic valve of claim 1, wherein the spool assembly includes an integrally disposed check valve tube and check valve disc.
3. The hydraulic valve of claim 1, wherein the hydraulic valve is pressure balanced.
4. The hydraulic valve of claim 1, wherein the at least one groove substantially increases fluid flow through the hydraulic valve when the at least one groove is open only in the first position.
5. The hydraulic valve of claim 1, wherein the at least one groove substantially increases fluid flow through the hydraulic valve when the at least one groove is open only in the third position.
6. The hydraulic valve of claim 1, wherein the at least one groove substantially increases a fluid flow rate through the hydraulic valve when the at least one groove is opened in the first and third positions.
7. The hydraulic valve of claim 1, wherein the at least one groove substantially increases fluid flow through the hydraulic valve whenever a spool strokes into the first position.
8. The hydraulic valve of claim 1, wherein the at least one groove substantially increases fluid flow through the hydraulic valve whenever the spool strokes into the third position.
9. The hydraulic valve of claim 1, wherein the at least one groove substantially increases fluid flow through the hydraulic valve after a spool stroke travels a predetermined distance in the first position.
10. The hydraulic valve of claim 1, wherein the at least one groove substantially increases fluid flow through the hydraulic valve after a spool stroke travels a predetermined distance in the third position.
11. The hydraulic valve of claim 1, wherein the at least one groove is uniform.
12. The hydraulic valve of claim 1, wherein the at least one groove has a smaller groove portion and a larger groove portion.
13. The hydraulic valve of claim 1, wherein the at least one groove increases fluid flow by at least 50% as compared to an absence of the at least one groove.
14. The hydraulic valve of claim 1, wherein the at least one groove increases fluid flow by at least 100% as compared to an absence of the at least one groove.
15. The hydraulic valve of claim 1, wherein the at least one groove increases fluid flow by at least 200% as compared to an absence of the at least one groove.
16. The hydraulic valve of claim 1, wherein the spool includes a plurality of bores each having the same size, the plurality of bores merging into the at least one groove.
17. The hydraulic valve of claim 1, wherein the spool includes at least two differently sized bores that merge into the at least one groove.
18. A hydraulic valve for a cam phaser, comprising:
a valve cartridge assembly including a valve cartridge axially movable in a central opening of a valve housing; and
first and second check valves axially disposed in the spool, the first and second check valves preventing hydraulic fluid flowing through the spool assembly from inadvertently flowing out of the interior space of the spool assembly in first and second flows through the first and second openings of the spool associated with the first and second operating connections, respectively;
wherein the valve core assembly has at least a first position, a second position and a third position,
wherein when the spool assembly is in the first position, the hydraulic fluid flows from the first operating joint to the second operating joint,
wherein when the valve spool assembly is in the second position, the hydraulic fluid does not flow between the first and second operating joints,
wherein when the spool assembly is in the third position, the hydraulic fluid flows from the second operating joint to the first operating joint,
wherein the first and second operating joints open and close according to the position of the spool, an
Wherein the check valve is axially movable on the supply tube of the cartridge assembly and has an opposite opening direction.
19. The hydraulic valve of claim 18, wherein the first check valve abuts against a recess of the spool and the second check valve abuts against a check valve disc.
20. The hydraulic valve of claim 19, wherein the check valve disc is fixed to an end of the supply tube.
21. The hydraulic valve of claim 19, wherein the check valve disc and the supply tube are integrally provided.
22. The hydraulic valve as set forth in claim 18,
wherein the valve element comprises a plurality of bores which merge into at least one groove on the outside of the valve element, and
wherein the at least one groove substantially increases fluid flow through the hydraulic valve when the at least one groove is opened in the first position or the third position or both the first position and the third position.
23. The hydraulic valve of claim 22, wherein the spool includes a plurality of bores each having the same size.
24. The hydraulic valve of claim 22, wherein the spool includes a plurality of apertures having at least two different sizes.
25. The hydraulic valve of claim 22, wherein the at least one groove is offset from the bore.
Technical Field
The present invention relates to an oil control valve for a cam phaser for an internal combustion engine in which a spool is positioned by an external actuator and the spool has a groove.
Background
Hydraulic valves for cam phasers of internal combustion engines are well known in the art. The hydraulic valve includes a piston that is axially movable in a housing of the hydraulic valve and that controls the hydraulic load of the cam phaser. There are many different configurations of desired hydraulic valves and a new original design is typically required for each new desired hydraulic valve. Accordingly, there is a need in the art to reduce the need for the original design when designing new hydraulic valves.
Disclosure of Invention
It is an object of the present invention to provide a hydraulic valve for a cam phaser including a spool assembly including a spool axially movable in a central opening of a valve housing and at least one groove on an outside of the spool. The valve core assembly has at least a first position, a second position corresponding to the retained position, and a third position, and fluid flows through the hydraulic valve when the valve core assembly is in the first position or the third position. Additional positions therebetween are possible. The at least one groove substantially increases a fluid flow rate through the hydraulic valve when the at least one groove is opened in the first position or the third position or both the first position and the third position. The valve core assembly may include a check valve tube and a check valve disc provided in one piece. The hydraulic valve may be pressure balanced. The at least one recess may substantially increase the fluid flow through the hydraulic valve when the at least one recess is open in only the first position or only the third position, but not both positions. The at least one groove may substantially increase fluid flow through the hydraulic valve once the spool stroke enters the first and/or third positions, or may do so after the spool stroke travels a predetermined distance in the first and/or third positions. The at least one groove may be uniform or may have a smaller groove portion and a larger groove portion. The at least one groove increases fluid flow by at least 50%, 100%, or even 200% as compared to the absence of the at least one groove. The valve core may include a plurality of holes of the same size, or may include a plurality of holes having at least two different sizes.
It is another object of the present invention to provide a hydraulic valve for a cam phaser including a spool assembly including a spool axially movable in a central opening of a valve housing. The spool assembly has first and second check valves axially disposed within the spool that prevent hydraulic fluid flowing through the spool assembly from inadvertently flowing out of the interior space of the spool assembly in first and second flows through the first and second openings of the spool associated with the first and second operating joints, respectively. The spool assembly has at least a first position, a second position, and a third position. When the spool assembly is in the first position, hydraulic fluid can flow from the first operating joint to the second operating joint, when the spool assembly is in the second position, hydraulic fluid does not flow between the first operating joint and the second operating joint, and when the spool assembly is in the third position, hydraulic fluid can flow from the second operating joint to the first operating joint. The operating joint and the second operating joint open and close according to the position of the spool. The check valve is axially movable on the supply tube of the cartridge assembly and has an opposite opening direction. The first check valve may abut against the recess of the spool and the second check valve may abut against the check valve disc. The check valve disc may be secured to the end of the supply tube. The check valve disc and the supply pipe may be provided in one piece. The spool may include a plurality of apertures incorporated into at least one groove on an outside of the spool, wherein the at least one groove substantially increases fluid flow through the hydraulic valve when the at least one groove is opened in the first position or the third position or both the first and third positions. The valve core may include a plurality of holes each having the same size. The valve core may include a plurality of apertures having at least two different sizes. The at least one recess may be offset from the aperture.
Drawings
Further advantages, features and details of the invention can be taken from the following description of an advantageous embodiment and the drawings. The features and combinations of features set forth in the foregoing description, as well as the features and combinations of features set forth and illustrated in the accompanying drawings individually, may be used not only in the combination set forth individually, but in other combinations or alone without departing from the spirit and scope of the invention. The same reference numerals are used to denote identical or functionally equivalent elements. For purposes of clarity, possible elements have not been designated with reference numbers in all of the figures, but have not lost their association, wherein:
FIG. 1 illustrates an exemplary embodiment of an oil control valve assembly of the present invention;
FIG. 2 illustrates an assembled view of another exemplary embodiment of an oil control valve for a cam phaser of an internal combustion engine of the present invention;
FIG. 3 illustrates an exemplary embodiment of a prior art valve cartridge wherein openings in the valve cartridge meter oil flow;
FIG. 4 illustrates a second exemplary embodiment of a prior art valve cartridge, wherein an opening in the valve cartridge meters oil flow;
FIG. 5 illustrates a first exemplary embodiment of a valve spool, wherein an opening in the valve spool meters oil flow;
FIG. 6 shows a second exemplary embodiment of a valve cartridge similar to the valve cartridge of FIG. 5, but with openings of different sizes;
FIG. 7 illustrates another embodiment of the oil control valve assembly of the present invention having 0mm travel (home position);
FIG. 8 shows the oil control valve according to FIG. 7 with 1.5mm travel (neutral or hold position);
fig. 9 shows the oil control valve according to fig. 7 with 3mm travel (end position);
FIG. 10 shows a graph of flow rate versus spool travel for a spool having a hole but no groove, such as the spool of FIG. 3;
FIG. 11 shows a graph of flow rate versus spool travel for a spool having a bore and a groove starting with the bore diameter, such as the spool of FIG. 4;
FIG. 12 shows a graph of flow rate versus spool travel for a spool having a bore and a groove starting 0.8mm behind the bore opening, such as the spool of FIG. 5;
FIG. 13 shows a graph of flow rate versus spool travel for a spool having fewer orifices and a groove that begins 0.5mm behind the orifice opening, such as the spool of FIG. 6;
FIG. 14 shows a flow aperture in a housing;
FIG. 15 shows a small flow area;
FIG. 16 illustrates an increased flow area corresponding to a location where a groove is exposed to increase flow;
FIG. 17 shows a flow hole in the valve core;
FIG. 18 shows the aperture edge at the port edge;
FIG. 19 illustrates the increased flow area; and
fig. 20 illustrates an example valve core assembly having a groove offset from the bore.
Detailed Description
The present invention relates to an oil control valve for a cam phaser for an internal combustion engine in which a spool is positioned by an external actuator and has a groove. In the prior art, metering of the flow from the supply channel to the control channel is achieved by opening a port on the drilled channel hole. When the spool moves and the port begins to open, only a small area of the bore is uncovered to allow oil to flow. This is important in cam phaser oil control valves where the intermediate position is used to hold the phaser position and a small flow is required on either side of the hold position (either advance or retard) to compensate for leakage. When fast phaser movement is desired, the additional spool travel exposes a larger area and increases the flow. However, unlike the prior art, the present invention uses drilled access holes to meter the flow near the holding location and further places the notch into a run that allows for increased flow for fast phaser movement. Advantageously, the oil control valve is pressure balanced. Advantageously, the oil control valve may include a check valve tube and a check valve disc provided in one piece.
FIG. 1 illustrates an exemplary embodiment of an
The first and
The
Fig. 3 shows an exemplary embodiment of a prior
Fig. 4 shows a second exemplary embodiment of a prior
Fig. 5 shows a first exemplary embodiment of the
Fig. 6 shows a second exemplary embodiment of the
The relationship of flow to travel around the hold position can be set by controlling the size and number of
Fig. 7 shows an
Fig. 8 shows the
Fig. 9 shows the
The
FIG. 10 is a graph of flow rate versus spool travel for a
FIG. 11 is a graph of flow rate versus spool travel for a
FIG. 12 is a graph of flow rate versus spool travel for a
Here, the flow rate substantially matches that of fig. 10, which does not include the
Fig. 13 is a graph of flow rate versus spool travel for a
Here, since there are fewer holes than in fig. 10, the flow rate decreases. Once the spool moves 0.5mm from the orifice, the
The flow rates from the
Fig. 14 shows the
Fig. 15 shows a small flow area. In the prior art device and the present invention, a small flow area occurs without the
Fig. 16 shows the increased flow area, which corresponds to the location where the
Fig. 17 shows the
Fig. 18 shows the hole edge of the
Fig. 19 shows the increased flow area of the
Fig. 20 illustrates an example
Although several embodiments of the present invention and their advantages have been described in detail, it should be understood that changes, substitutions, variations, alterations, adaptations, variations, substitutions and alterations can be made therein without departing from the teachings of the invention, the spirit and scope of which is set forth in the following claims.
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