Recirculating hydraulic fluid control valve

Abstract

A hydraulic fluid control valve (HFCV) is provided, configured to recirculate discharged hydraulic fluid from a first hydraulic actuation chamber to a second hydraulic actuation chamber. The HFCV includes a selectively movable valve spool having an outer annular portion configured to receive discharged hydraulic fluid and deliver it to a reservoir or one or both of the first and second hydraulic actuation chambers.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority to U.S. non-provisional patent application 17 / 205,434, filed March 18, 2021, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to hydraulic fluid control valves that can be applied to hydraulically actuated components or systems, including but not limited to camshaft phase shifters for internal combustion (IC) engines. Background Technology

[0004] Hydraulic fluid control valves manage the delivery of pressurized hydraulic fluid to hydraulically actuated components, such as the camshaft phase shifter in an internal combustion engine. The pressurized hydraulic fluid in an internal combustion engine is supplied by a hydraulic fluid pump fluidly connected to a reservoir or tank. The size of the hydraulic fluid pump and its power requirements depend on the total volume of pressurized fluid required or consumed by the internal combustion engine and its associated hydraulic fluid system. This required or consumed hydraulic fluid can be reduced by recirculating and reusing at least some of the hydraulic fluid, which is typically returned to the reservoir or tank after being used for actuation purposes within the hydraulically actuated components. Summary of the Invention

[0005] An example embodiment of a hydraulic fluid control valve including a housing and a valve spool is provided. The housing has a first fluid port and a second fluid port, the first fluid port being configured to be fluidly connected to a first hydraulic actuation chamber and the second fluid port being configured to be fluidly connected to a second hydraulic actuation chamber. The first and second hydraulic actuation chambers are configured to receive hydraulic fluid and discharge hydraulic fluid. The valve spool is disposed within an opening in the housing. The valve spool has a first orifice, a second orifice, a third orifice, an outer annular portion, and an internal fluid chamber. The first orifice may be disposed at the actuating end of the valve spool, and the third orifice may be disposed at the spring end of the valve spool. The first orifice may be configured to receive hydraulic fluid from a pressurized hydraulic fluid source. The internal fluid chamber is configured to allow hydraulic fluid to flow from the first orifice to the second orifice and from the first orifice to the third orifice. The internal chamber is configured to continuously fluidly connect any one of the three orifices to each other in a first axial position and a second axial position of the valve spool. In the longitudinal direction of the valve core, the second orifice is arranged between the first orifice and the third orifice, the outer annular portion is arranged between the second orifice and the third orifice, and the internal fluid chamber extends from the first orifice to the third orifice.

[0006] In a first axial position of the valve core, the first orifice is configured to deliver hydraulic fluid to a first hydraulic actuation chamber. In the first axial position, the outer annular portion is configured to receive hydraulic fluid from a second hydraulic actuation chamber and deliver at least a portion of the hydraulic fluid from the second hydraulic actuation chamber to the first hydraulic actuation chamber. In the first axial position, the outer annular portion is configured to deliver the remaining portion of the hydraulic fluid from the second hydraulic actuation chamber to a discharge port disposed within the hydraulic fluid control valve.

[0007] In the second axial position of the valve core, the third orifice is configured to deliver hydraulic fluid to the second hydraulic actuation chamber. In the second axial position, the outer annular portion is configured to receive hydraulic fluid from the first hydraulic actuation chamber and deliver at least a portion of the hydraulic fluid from the first hydraulic actuation chamber to the second hydraulic actuation chamber. In the second axial position of the valve core, the outer annular portion is configured to deliver the remaining portion of the hydraulic fluid from the first hydraulic actuation chamber to a discharge port disposed within the hydraulic fluid control valve. The discharge port can be fluidly connected to the axial end of the hydraulic fluid control valve.

[0008] In an example embodiment, the hydraulic fluid control valve includes a one-way valve disposed between the valve core and the inner surface of an opening in the housing. The one-way valve may be configured to: i) allow hydraulic fluid to flow from the outer annular portion to the first and second hydraulic actuation chambers, and ii) prevent hydraulic fluid from flowing from the first and second hydraulic actuation chambers to the outer annular portion. The one-way valve may open radially outward to allow hydraulic fluid to flow from the outer annular portion to the first and second hydraulic actuation chambers.

[0009] In an example embodiment, the hydraulic fluid control valve includes a fixed hydraulic sleeve radially disposed between a valve core and a housing, and a check valve disposed on the fixed hydraulic sleeve. The fixed hydraulic sleeve may include: at least one first fluid opening continuously fluidly connected to a first orifice; at least one second fluid opening configured to selectively fluidly connect to either a second orifice or an outer annular portion; at least one third fluid opening configured to selectively fluidly connect to either a third orifice or an outer annular portion; and at least one fourth fluid opening configured to continuously fluidly connect to the outer annular portion. The at least one fourth fluid opening may be configured to fluidly connect to both a first hydraulic actuation chamber and a second hydraulic actuation chamber.

[0010] In an example implementation, the housing includes a third fluid port configured to fluidly connect the valve spool to a pressurized hydraulic fluid source.

[0011] In an example embodiment, the housing includes a fourth fluid port configured as a discharge port, and the fourth fluid port is arranged in the longitudinal direction of the hydraulic fluid control valve between the third fluid port and the solenoid of the hydraulic fluid control valve.

[0012] In an example embodiment, under a first pressure state in the first hydraulic actuation chamber, the outer annular portion is configured to: i) receive a first amount of hydraulic fluid from the second hydraulic actuation chamber, and ii) deliver a first portion of the first amount of hydraulic fluid to the first hydraulic actuation chamber; and under a second pressure state in the first hydraulic actuation chamber, different from the first pressure state, the outer annular portion is configured to: i) receive a first amount of hydraulic fluid from the second hydraulic actuation chamber, and ii) deliver a second portion of the first amount of hydraulic fluid to the first hydraulic actuation chamber, the second portion being larger than the first portion. In an example embodiment, under the first pressure state in the first hydraulic actuation chamber, the outer annular portion delivers a third portion of the first amount of hydraulic fluid to the discharge port of the hydraulic fluid control valve; and under the second pressure state in the first hydraulic actuation chamber, the outer annular portion delivers a fourth portion of the first amount of hydraulic fluid to the discharge port of the hydraulic fluid control valve, the fourth portion being smaller than the third portion.

[0013] An example embodiment of a hydraulic fluid control valve configured as a single unit attached to an internal combustion engine includes a coil, an armature, a pusher attached to the armature, a housing, and a valve spool actuated by the pusher. The armature is surrounded by the coil and configured to be actuated by a magnetic field generated by the coil. The valve spool includes a first outer connecting plate, a second outer connecting plate, and an outer annular portion formed by the first and second outer connecting plates. The outer annular portion is configured to: i) recirculate hydraulic fluid from either the first or second hydraulic actuation chamber to the other of the first or second hydraulic actuation chamber; and ii) deliver hydraulic fluid to a discharge passage of the hydraulic fluid control valve. The valve spool includes an internal fluid chamber having a radially outer wall including a first orifice, a second orifice, and a third orifice. The internal fluid chamber is configured to continuously fluidly connect the first, second, and third orifices to each other. The first and second outer connecting plates, the radially outer wall, and the first, second, and third orifices are all integrally formed with the valve spool.

[0014] In the example implementation, the discharge passage extends axially toward the spring end of the valve core and exits through the axial opening end of the hydraulic fluid control valve. Attached Figure Description

[0015] The above and other features and advantages of the embodiments described herein, as well as the ways in which these features and advantages are obtained, will become apparent and better understood by referring to the following description of several exemplary embodiments in conjunction with the accompanying drawings. A brief description of the drawings is now provided below.

[0016] Figure 1 This is a perspective view of an example implementation of a hydraulic fluid control valve (HFCV).

[0017] Figure 2 This is a perspective view of a camshaft phase shifter connected to the camshaft, which can be coupled with... Figure 1 HFCV can be used together.

[0018] Figure 3 yes Figure 2 A perspective view of a camshaft phase shifter without end caps to show multiple hydraulically actuated chambers.

[0019] Figure 4 yes Figure 1 An exploded perspective view of the HFCV, which includes a solenoid, a valve body, a valve core, and a hydraulic sleeve with a check valve.

[0020] Figure 5 yes Figure 4 A three-dimensional view of the valve housing.

[0021] Figure 6 yes Figure 4 A 3D view of the valve core.

[0022] Figure 7A yes Figure 4 A 3D view of a hydraulic sleeve without a check valve installed.

[0023] Figure 7B yes Figure 4 A 3D view of a hydraulic sleeve with a check valve installed.

[0024] Figure 8 This is a perspective view of an example embodiment of a two-part hydraulic sleeve constructed by an embedding molding process or an overmolding process.

[0025] Figure 9A It is when the HFCV is de-energized and the valve core is in the extended position. Figure 1 A cross-sectional view of the section.

[0026] Figure 9B It is when the HFCV is in the first energized state and the valve core is in the middle position that it starts from... Figure 1 A cross-sectional view of the section.

[0027] Figure 9C It is when the HFCV is in the second energized state and the valve core is in the fully displaced position that... Figure 1 A cross-sectional view of the section.

[0028] Figure 10A It is when the HFCV is de-energized and the valve core is in the extended position. Figure 1A cross-sectional view of the section.

[0029] Figure 10B It is when the HFCV is in the first energized state and the valve core is in the middle position that it starts from... Figure 1 A cross-sectional view of the section.

[0030] Figure 10C It is when the HFCV is in the second energized state and the valve core is in the fully displaced position that... Figure 1 A cross-sectional view of the section.

[0031] Figure 11A It is when the HFCV is de-energized and the valve core is in the extended position. Figure 1 A cross-sectional view of the section.

[0032] Figure 11B It is when the HFCV is in the first energized state and the valve core is in the middle position that it starts from... Figure 1 A cross-sectional view of the section.

[0033] Figure 11C It is when the HFCV is in the second energized state and the valve core is in the fully displaced position that... Figure 1 A cross-sectional view of the section. Detailed Implementation

[0034] Elements marked with the same reference numerals appearing in different figures refer to the same elements, but may not be referenced in the description used for all figures. The examples set forth herein illustrate at least one embodiment in at least one form, and such examples are not to be construed as limiting the scope of the claims in any way. Certain terms used in the following description are for convenience only and not for limitation. The terms “internal,” “external,” “inward,” and “outward” refer to directions toward and away from the portion referenced in the figures. Axial refers to the direction along the central axis of diameter or the axis of rotation. Radial refers to the direction perpendicular to the central axis. The terms “left,” “right,” “up,” “above,” “upper,” “lower,” “downward,” and “below” indicate directions in the referenced figures. Terms include those specifically noted above, their derivatives, and terms with similar meanings.

[0035] Figure 1 This is a perspective view of an example embodiment of the hydraulic fluid control valve 10 (HFCV). Figure 2 This is a perspective view of the camshaft phase shifter 100, which is attached to the camshaft 150 so that the camshaft phase shifter 100 is... Figure 1 The HFCV 10 is used to control the camshaft 150 to be phased relative to the camshaft (not shown) of the internal combustion (IC) engine. Figure 3 This is a perspective view of the rotor 102 and stator 104 of the camshaft phase shifter 100. Figure 4 yes Figure 1 An exploded perspective view of the HFCV 10, which includes a solenoid assembly 12, a valve housing 20, a valve core 40, and a hydraulic sleeve 60 having a first check valve 87A and a second check valve 87B. Figure 5 yes Figure 4 A perspective view of the valve housing 20. Figure 6 yes Figure 4 A three-dimensional view of valve core 40. Figure 7A yes Figure 4 A perspective view of the hydraulic sleeve 60 without the first check valve 87A and the second check valve 87B installed. Figure 7B yes Figure 4 A perspective view of the hydraulic sleeve 60 with the first check valve 87A and the second check valve 87B installed. Figure 8 This is a perspective view of an example embodiment of a two-part hydraulic sleeve constructed by an embedding molding process or an overmolding process. Figure 9A It is when HFCV 10 is de-energized and valve core 40 is in the extended position. Figure 1 A cross-sectional view of the section. Figure 9B It is when HFCV 10 is in the first energized state and valve core 40 is in the middle position that... Figure 1 A cross-sectional view of the section. Figure 9C It is when HFCV 10 is in the second energized state and valve core 40 is in the fully displaced position that... Figure 1 A cross-sectional view of the section. Figure 10A It is when HFCV 10 is de-energized and valve core 40 is in the extended position. Figure 1 A cross-sectional view of the section. Figure 10B It is when HFCV 10 is in the first energized state and valve core 40 is in the middle position that... Figure 1 A cross-sectional view of the section. Figure 10C It is when HFCV 10 is in the second energized state and valve core 40 is in the fully displaced position that... Figure 1 A cross-sectional view of the section. Figure 11A It is when HFCV 10 is de-energized and valve core 40 is in the extended position. Figure 1 A cross-sectional view of the section. Figure 11B It is when HFCV 10 is in the first energized state and valve core 40 is in the middle position that... Figure 1 A cross-sectional view of the section. Figure 11C It is when HFCV 10 is in the second energized state and valve core 40 is in the fully displaced position that... Figure 1 A cross-sectional view taken from the sample. It should be based on... Figures 1 to 11C Read the following discussion.

[0036] The camshaft phase shifter 100 is hydraulically actuated by pressurized hydraulic fluid F, which is controlled by HFCV 10 to rotate the rotor 102 clockwise (CW) or counterclockwise (CCW) relative to the stator 104 about the axis of rotation 106 via a hydraulic actuation chamber 108. The hydraulic actuation chamber 108 is formed by outwardly projecting blades 103 of the rotor 102 and inwardly projecting lugs 105 of the stator 104. When the rotor 102 is connected to the camshaft 150, the clockwise (CW) and counterclockwise (CCW) rotation of the rotor 102 relative to the stator 104 can advance or delay engine valve events relative to the four-stroke cycle of the IC engine. Clockwise (CW) rotation of rotor 102 relative to stator 104 can be achieved by: 1) pressurizing the first hydraulic actuation chamber 110A via a first hydraulic fluid channel 112A arranged in rotor 102; and 2) depressurizing the second hydraulic actuation chamber 110B via a second hydraulic fluid channel 112B arranged in rotor 102, the second hydraulic fluid channel fluidly connecting the second hydraulic actuation chamber 110B to a discharge passage via HFCV 10, which returns hydraulic fluid to a "box" or reservoir. Similarly, counterclockwise (CCW) rotation of rotor 102 relative to stator 104 can be achieved by: 1) pressurizing the second hydraulic actuation chamber 110B via the second hydraulic fluid channel 112B arranged in rotor 102; and 2) depressurizing the first hydraulic actuation chamber 110A via the first hydraulic fluid channel 112A, the first hydraulic fluid channel fluidly connecting the first hydraulic actuation chamber 110A to a box via HFCV 10. The aforementioned pressurization and depressurization actions of the first hydraulic actuation chamber 110A and the second hydraulic actuation chamber 110B can be performed by the HFCV 10. The HFCV 10 is fluidly connected to a hydraulic fluid pressure source 35, such as an oil pump, and can electronically communicate with a controller 99, such as an engine control unit (ECU), via terminal 14 to control the camshaft phase shifter 100. Although the HFCV 10 is described as controlling the camshaft phase shifter 100, any phase adjustment mechanism, such as, but not limited to, a phase adjustment mechanism for a variable compression ratio system, can be controlled by the HFCV 10.

[0037] HFCV 10 includes a solenoid assembly 12, a valve housing 20, a valve core 40, a bias spring 56, a hydraulic sleeve 60, and a retaining ring 84.

[0038] The solenoid assembly 12 includes an electrical connector 13, a coil 15, an armature 16, a first pole 17, a push pin 18, and a mounting plate 19. The electrical connector 13 includes two terminals 14 configured to facilitate electronic communication with the ECU 99. The mounting plate 19, together with the solenoid assembly 12, forms a... Figure 4As shown, however, the mounting plate can also be part of another sub-assembly of the HFCV 10, or simply a separate component. The pusher 18 is rigidly mounted to the armature 16, such that the pusher 18 moves in unison with the armature 16. The HFCV 10 can be described as a pulse width modulation proportional valve typically used in camshaft phase shifter applications.

[0039] The valve housing 20 includes a body 25 and a second pole 26, the second pole extending from the actuator end 32 of the body 25 into a portion of the coil 15. The body 25 has a first port array 90A, which includes a supply fluid port 22, a first fluid port 23, and a second fluid port 24. The body 25 also has a second port array 91A, which includes a discharge fluid port 21', a supply fluid port 22', a first fluid port 23', and a second fluid port 24'. Each of the first port array 90A and the second port array 91A has repeating port arrays 90B, 91B arranged opposite or opposite to the first port array 90A and the second port array 91A at a 180-degree angle. Figure 5 The first port array 90A and the second port array 91A are best shown in a parametric manner. Figures 9A to 9C The top of the cross-sectional view shows the first port array 90A, and Figures 9A to 9C The bottom of the cross-sectional view shows the repeating first port array 90B. Similarly, Figures 10A to 10C The top of the cross-sectional view shows the second port array 91A, and Figures 10A to 10C The bottom of the cross-sectional view shows the repeating second port array 91B. In the figures, the component reference numerals for the repeating first port array 90B and the repeating second port array 91B are the same as those for the first port array 90A and the second port array 91A.

[0040] A first opening 28 of the valve housing 20 extends through the body 25, intersecting and connecting with each radially arranged supply fluid port 22, first fluid port 23, and second fluid port 24. A second opening 29, directly connected to the first opening 28, extends through the second pole 26. A pusher 18 moves longitudinally within the second opening 29 to actuate the valve spool 40. An anti-rotation cavity 30 is located at the retaining end 31 of the first opening 28 and is configured to receive a protrusion of the hydraulic sleeve 60 to align the hydraulic sleeve 60 relative to the valve housing 20. The hydraulic sleeve 60 is held in a fixed position within the first opening 28 of the valve housing 20 by a retaining ring 84.

[0041] The valve spool 40 of the HFCV 10 is biased toward the solenoid assembly 12 or actuator end 11 of the HFCV 10 by the force Fb of the bias spring 56. The pulse width modulation solenoid assembly 12 can apply a force F1 on the push-receive connection disc 47 arranged on the actuator end 48 of the valve spool 40 to overcome the biasing force Fb of the bias spring 56, so as to selectively move the valve spool 40 to a desired longitudinal position, such as... Figure 9B and Figure 9C The longitudinal position is shown. Other types of actuators or solenoid assemblies that move the valve core 40 are also possible. The position of the valve core 40 within the HFCV 10 is controlled by the ECU 99, which can control the duty cycle of the solenoid assembly 12.

[0042] HFCV 10 can be disposed within camshaft phaser 100; for example, HFCV 10 can be configured to attach camshaft phaser 100 to a central fastener of camshaft 150. HFCV 10 can also be disposed at a remote location within the IC engine, outside the scope of camshaft phaser 100. The embodiments and functional strategies described herein can also be applied to other HFCV applications not described in this disclosure.

[0043] Reference Figure 9A and Figure 9C Considering Figure 3 The diagram shows different longitudinal positions of the valve core 40, wherein pressurized hydraulic fluid is selectively delivered to the first hydraulic actuation chamber 110A or the second hydraulic actuation chamber 110B of the camshaft phase shifter 100 via: i) a first fluid channel 112A and a second fluid channel 112B arranged in the rotor 102; ii) a first fluid port 23 and a second fluid port 24 arranged on the valve housing 20; and iii) the inlet hydraulic fluid paths A and A1 of the HFCV 10.

[0044] Clockwise CW actuation of rotor 102 relative to stator 104 requires pressurization of the first hydraulic actuation chamber 110A via the first hydraulic fluid channel 112A and depressurization of the second hydraulic actuation chamber 110B via the second hydraulic fluid channel 112B. Camshaft torque, sometimes referred to as "torque," acts on camshaft 150 in both clockwise and counterclockwise directions and is a result of valve mechanism reaction forces acting on the open and closed sides of the camshaft camshaft cam as it rotates. Assuming clockwise rotation of camshaft 150, the open side of the camshaft cam can result in counterclockwise CCW torque on the camshaft and camshaft phaser due to valve mechanism reaction forces; furthermore, the closed side of the camshaft cam can result in clockwise torque due to valve mechanism reaction forces. In the case of counterclockwise CCW torque, it is possible that the torque can overcome the force F of pressurized fluid acting on the blades (or blades) of rotor 102, which actuates rotor 102 relative to stator 104 in a clockwise CW direction. In this case, hydraulic fluid F can be forced out of the first hydraulic actuation chamber 110A. The camshaft 150 camshaft cam ... The operating principle is achieved by transferring some of the hydraulic fluid from one set of hydraulic actuation chambers to another set of hydraulic actuation chambers for replenishment purposes.

[0045] The valve core 40 includes, in a sequential longitudinal order, a spring end 41, a first connecting disc 42, a second connecting disc 43, a third connecting disc 44, a fourth connecting disc 45, a fifth connecting disc 46, and a push-in receiving connecting disc 47 at the actuator end 48. The first connecting disc 42 and the second connecting disc 43 form a first section of the valve core 40 defining a first outer annular portion 49; the second connecting disc 43 and the third connecting disc 44 form a second section defining a second outer annular portion 50; the third connecting disc 44 and the fourth connecting disc 45 form a third section defining a third outer annular portion 51; and the fourth connecting disc 45 and the fifth connecting disc 46 form a fourth section defining a fourth outer annular portion 52. The valve core 40 further includes: a first through hole 53A disposed within the first outer annular portion 49 between the first connecting plate 42 and the second connecting plate 43; a second through hole 53B disposed within the second outer annular portion 50 between the second connecting plate 43 and the third connecting plate 44; and a third through hole 53C disposed within the third outer annular portion 51 between the third connecting plate 44 and the fourth connecting plate 45. The valve core 40 is closed at the actuator end 48 and open at the spring end 41.

[0046] The valve core 40 has a longitudinal opening 54 with an inner radial surface 55, which, together with a piston 57 disposed within the spring end 41 of the valve core 40, forms an internal fluid chamber 58. The piston 57 and the inner radial surface 55 also define an annular cavity 59 that receives a bias spring 56. Other arrangements of the valve core 40 excluding the piston 57 are also possible. The internal fluid chamber 58 may include a first through-hole, a second through-hole, and third through-holes 53A-53C, such that the first through-hole, the second through-hole, and the third through-holes 53A-53C are fluidly connected to the internal fluid chamber 58. Furthermore, the first through-hole, the second through-hole, and the third through-holes 53A-53C can be fluidly connected to each other continuously via the internal fluid chamber 58. That is, regardless of the position of the valve core, a continuous fluid connection can exist between any one of the three through-holes 53A to 53C and any or all of the other two through-holes, as shown in the figures. For the purposes of this disclosure, two adjacent fluid channels connected to each other via a one-way fluid valve are "fluidly connected," but not "continuously fluidly connected," because there are defined fluid pressure conditions that do not generate fluid flow from one hydraulic fluid channel to another. The valve core 40, its five connecting discs 41-46, four outer annular portions 49-52, push-to-receive connecting disc 47, and the first through hole, second through hole, and third through hole 53A-53C are integrally formed as a single component.

[0047] For the purposes of this disclosure, the internal fluid chamber 58 is defined by a cavity, opening, or orifice that directly contacts and contains a volume of hydraulic fluid, specifically, the hydraulic fluid being transported to or from the hydraulic actuation chamber 108. The internal fluid chamber 58 can be continuous and uninterrupted (or continuously open) such that the entire length L of the internal fluid chamber is in direct contact with the hydraulic fluid; in other words, the internal fluid chamber 58 can be continuous from the first through-hole 53A to the third through-hole 53C, allowing the hydraulic fluid to flow continuously from the first through-hole 53A to the third through-hole 53C and be contained within the internal fluid chamber 58 without interruption. As shown in the figures, the internal fluid chamber 58 can be shaped as an opening or any other suitable shape to receive and contact the hydraulic fluid. As shown in the figures, additional components of the HFCV 10 are not mounted or disposed within the internal fluid chamber 58; however, such an arrangement is possible. Figure 9B As shown, the cross-sectional area of ​​the internal fluid chamber 58 at any longitudinal position X within the length L of the internal fluid chamber 58 can be obtained by dividing the radius Rx The radius Rx is calculated by multiplying the square of pi (3.14159). The radius Rx extends from the central axis 85 of the HFCV 10, which can also be described as the actuation axis, to the inner radial surface 55 of the opening 54 defining the inner fluid chamber 58. The radius of the opening 54 shown in the figures is constant; however, the opening can have different radii along its entire length. Even so, the cross-sectional area of ​​the inner fluid chamber 58 can still be calculated by ((pi) × Rx). 2 The internal fluid chamber 58 is defined by the following: Besides being continuously open in the longitudinal direction from the first through hole 53A to the third through hole 53C, it can also be said that the internal fluid chamber 58 is continuously open in the radial direction from the central axis 85 to the internal radial surface 55. A cutting plane arranged transversely to the central axis 85 and cutting through the internal fluid chamber 58 does not cut through any material (steel, plastic, etc.) from the internal radial surface 55 to the central axis 85. Therefore, the volume of the internal fluid chamber 58 can be determined by multiplying its cross-sectional area by its length L.

[0048] The valve core 40 is disposed within the opening 61 or cavity of the hydraulic sleeve 60. The hydraulic sleeve 60 is disposed within the first opening 28 of the valve housing 20. The first, second, third, fourth, and fifth connecting discs 42-46 of the valve core 40 are engaged by the inner radial surface 62 of the opening 61 of the hydraulic sleeve 60 and are slidably guided by the inner radial surface in a sealing manner. The hydraulic sleeve 40 has an open actuating end 63 and a closed retaining end 64. The closed retaining end 64 forms an axial abutment 65 for biasing the spring 56 and includes an outlet port 66 for discharging hydraulic fluid from the HFCV 10. The outlet port 66 is fluidly connected to a second discharge hydraulic fluid path T2, which will be described later in this disclosure.

[0049] The hydraulic sleeve 60 can be implemented as a single part or as a two-part hydraulic sleeve constructed by an insert molding process or an overmolding process. Other processes or designs are also possible to achieve the functionality of the hydraulic sleeve 60 described herein. Figure 7A The hydraulic sleeve 60 is shown without the first check valve 87A and the second check valve 87B installed, and Figure 7B The hydraulic sleeve 60 is shown with the first check valve 87A and the second check valve 87B installed. Figure 8 A hydraulic sleeve 60A with a two-part structure is shown, comprising an inner sleeve 67 and a covering molding part 68. The inner sleeve 67 may be made of metal or plastic, and the covering molding part 68 may be made of plastic, elastomer, or any suitable material. The metal inner sleeve 67 may be manufactured by drawing, extrusion, or any suitable manufacturing process.

[0050] The hydraulic sleeve 60 has a first through-hole array 92A and a second through-hole array 93A. The first through-hole array 92A is aligned with and continuously fluidly connected to a first port array 90A on the valve housing 20. The second through-hole array 93A is aligned with and continuously fluidly connected to a second port array 91A on the valve housing 20. The first through-hole array 92A includes a supply through-hole 70, a first through-hole 71, and a second through-hole 72.

[0051] The second through-orifice array 93A includes a discharge through-orifice 73', a supply through-orifice 70', a first through-orifice 71', a first pair of recirculation through-orifices 74', a second pair of recirculation through-orifices 75', and a second through-orifice 72'. A first check valve 87A covers the first pair of recirculation through-orifices 74', and a second check valve 87B covers the second pair of recirculation through-orifices 75'. The first check valve 87A and the second check valve 87B are radially outward deflected to: i) allow hydraulic fluid to flow radially outward from the corresponding first pair of recirculation through-orifices 74' and the second pair of recirculation through-orifices 75' to the corresponding first fluid port 23' and the second fluid port 24' of the valve housing 20; and ii) prevent hydraulic fluid from flowing radially inward from the first fluid port 23' and the second fluid port 24' to the corresponding first pair of recirculation through-orifices 74' and the second pair of recirculation through-orifices 75'. Each of these flow instances will be described in further detail later in this disclosure.

[0052] Within the second through-orifice array 93A, both the first through-orifice 71' and the first pair of recirculation through-orifices 74' lead to a first fluid opening 76', which is arranged radially outside the first through-orifice 71' and the first pair of recirculation through-orifices 74'. The first fluid opening 76' overlaps with the first fluid port 23', and because the hydraulic sleeve 60 is fixed to a relative position relative to the valve housing 20, the first fluid opening 76' is continuously fluidly connected to the first fluid port 23' of the valve housing 20. Similarly, within the second through-orifice array 93A, both the second through-orifice 72' and the second pair of recirculation through-orifices 75' lead to a second fluid opening 77', which is arranged radially outside the second through-orifice 72' and the second pair of recirculation through-orifices 75'. The second fluid opening 77' overlaps with the second fluid port 24' of the valve housing 20, and is therefore continuously fluidly connected to the second fluid port 24'. The crossbar 78 separates the first fluid opening 76' from the second fluid opening 77' and sealably engages the inner radial surface 33 of the first opening 28 of the valve housing 20, thereby axially sealing the first fluid opening 76' and the second fluid opening 77'. Another reference to the second through-hole array 92A is equivalent to the following features: a discharge through-hole 73', a supply through-hole 70', a first through-hole 71', a second through-hole 72', and a first fluid opening 76' and a second fluid opening 77'.

[0053] The first through-hole array 92A has a repeating first through-hole array 92B, which is arranged relative to the first through-hole array 92A with opposite or 180-degree circumferential angular increments. Similarly, the second through-hole array 93A has a repeating second through-hole array 93B, which is arranged relative to the second through-hole array 93A with opposite or 180-degree circumferential angular increments. Referring to the accompanying drawings, the element reference numerals of the repeating first through-hole array 92B and the repeating second through-hole array 93B are the same as those of the element reference numerals of the first through-hole array 92A and the second through-hole array 93A. Figure 7A and Figure 7B Parametric diagrams of the first through-hole array 92A and the second through-hole array 93A are shown, while Figures 9A to 9C The bottom of the cross-sectional view shows a repeating array of the first through-holes 92B, and Figures 10A to 10C The bottom of the cross-sectional view shows a repeating second through-hole array 93B. For further clarity, Figure 9A and Figure 11A At the corresponding top and bottom of each of these cross-sectional views, the matching array groups of both the hydraulic sleeve 60 and the valve housing 20 are identified. Figure 9A The matching arrays identified in the text also apply to Figure 9B and Figure 9C ,and Figure 11A The matching arrays identified in the text also apply to Figure 11B and Figure 11C .

[0054] Figure 9A , Figure 10A and Figure 11A Different cross-sectional views of the HFCV 10 are shown when the HFCV 10 is de-energized and the valve spool 40 is in the extended position. The following discussion describes the various hydraulic fluid paths and corresponding fluid connections that occur when the valve spool 40 is in this extended position. Each of the hydraulic fluid paths described is arranged in opposite directions within the HFCV 10.

[0055] Figure 9A This is a cross-sectional view of HFCV 10, showing the inlet hydraulic fluid path A and return hydraulic fluid path B of HFCV 10 when HFCV 10 is de-energized and valve spool 40 is in the extended position. In this extended position of valve spool 40, bias spring 56 applies a force Fb to the spring end 41 of valve spool 40, causing the brake end 48 of valve spool 40 to engage the base 27 of the second pole 26 of valve housing 20. Along the path of the inlet hydraulic fluid path A, the hydraulic fluid flows from the hydraulic fluid pressure source 35, through the supply fluid port 22 of the housing, through the supply through-hole 70 of the hydraulic sleeve 60, through the fourth outer annular portion 52 and the third through-hole 53C of the valve core 40, and flows to the internal fluid chamber 58 of the valve core 40. Once the hydraulic fluid reaches the internal fluid chamber 58, the hydraulic fluid flows continuously and uninterruptedly along the first flow direction FD1 toward the spring end 41 of the valve core until it reaches the longitudinal position of the first through-hole 53A. The hydraulic fluid flows from the internal fluid chamber 58, through the first through-hole 53A and the first outer annular portion 49 of the valve core 40, through the second through-hole 72 of the hydraulic sleeve 60, through the second fluid port 24 of the valve housing 20, and flows to the second hydraulic actuation chamber 110B.

[0056] Along Figure 9A The return hydraulic fluid path B is the path from the first hydraulic actuation chamber 110A, through the first fluid port 23 of the valve housing 20, through the first through-hole 71 of the hydraulic sleeve 60, and flows to the second outer annular portion 50 of the valve core 40. Then, the hydraulic fluid flow from the second outer annular portion 50 is directed to the second discharge hydraulic fluid path T2 or the recirculation hydraulic fluid path R', as will now be referred to. Figure 10A Described.

[0057] Figure 10A Cross-sectional views of the HFCV 10 in the de-energized state and the valve core in the extended position are also shown, but as... Figure 1As shown, in relation to Figure 9A The cross-sectional view is in different cutting planes. Figure 10A The diagram shows the inlet hydraulic fluid path A', the return hydraulic fluid path B', the first discharge hydraulic fluid path T1, the first discharge hydraulic fluid path T2, and the recirculation hydraulic fluid path R'. Along the path of hydraulic fluid path A', hydraulic fluid flows from the hydraulic fluid pressure source 35, through the supply fluid port 22' of the valve housing 20, through the supply through-hole 70' of the hydraulic sleeve 60, through the fourth outer annular portion 52 and the third through-hole 53C of the valve core 40, and into the internal fluid chamber 58 of the valve core 40. Once inside the internal fluid chamber 58, the hydraulic fluid flows continuously and uninterruptedly along the first flow direction FD1 toward the spring end 41 of the valve core 40 until it reaches the longitudinal position of the first through-hole 53A. From the internal fluid chamber 58, the hydraulic fluid flows through the first through-hole 53A and the first outer annular portion 49 of the valve core 40, through the second through-hole 72' of the hydraulic sleeve 60, through the second fluid port 24' of the valve housing 20, and into the second hydraulic actuation chamber 110B.

[0058] Along Figure 10A The first discharge hydraulic fluid path T1 is a path in which hydraulic fluid flows from the discharge through-hole 73' to the discharge fluid port 21'. The hydraulic fluid discharged from the discharge fluid port 21' returns to the hydraulic fluid reservoir, which is typically used for the hydraulic fluid pressure source 35. One purpose of the first discharge hydraulic fluid path T1 is to discharge hydraulic fluid that has accumulated in the discharge through-hole 73' due to internal radial leakage, which occurs between: i) the fifth connecting disc 46 of the valve core 40 and the internal radial surface 62 of the opening 61 of the hydraulic sleeve 60; or ii) the radial outer surface 69 of the hydraulic sleeve 60 and the internal radial surface 33 of the first opening 28 of the valve body 20. A second purpose of the first discharge hydraulic fluid path T1 is to discharge hydraulic fluid that has accumulated in a cavity 36 formed between the actuator end 48 of the valve core 40 and the second pole 26 of the valve body 20.

[0059] Along Figure 10AThe return hydraulic fluid path B' is the path through which hydraulic fluid flows from the first hydraulic actuation chamber 110A, through the first fluid port 23' of the valve housing 20, through the first fluid opening 76' and the first through-hole 71' of the hydraulic sleeve 60, and to the second outer annular portion 50 of the valve core 40. The hydraulic fluid can be divided from the second outer annular portion 50 into two separate hydraulic fluid paths: a second discharge hydraulic fluid path T2 and a recirculation hydraulic fluid path R'. The recirculation hydraulic fluid path R' facilitates the efficient reuse of hydraulic fluid from the first hydraulic actuation chamber 110A to the second hydraulic actuation chamber 110B. The recirculation hydraulic fluid path R' moves along the first fluid direction FD1 within the second outer annular portion 50, through the second recirculation through-hole 75' of the hydraulic sleeve 60, the second check valve 87B, and the second fluid opening 77', and through the second fluid port 24' of the valve housing 20. The amount of hydraulic fluid supplied from the first hydraulic actuation chamber 110A to the second hydraulic actuation chamber 110B via the recirculated hydraulic fluid path R' depends on the required pressure difference between the second outer annular portion 50 of the valve core 40 and the second hydraulic actuation chamber 110B. For positive hydraulic fluid flow to occur from the second outer annular portion 50 to the second hydraulic actuation chamber 110B, the hydraulic fluid pressure P3 within the second outer annular portion 50 needs to be greater than the hydraulic fluid pressure P2 within the second actuation chamber 110B. This pressure difference condition defines a positive pressure difference. Furthermore, the amount of hydraulic fluid supplied from the second outer annular portion 50 (via the first hydraulic actuation chamber 110A) to the second hydraulic actuation chamber 110B under the first positive pressure difference condition ΔP1 differs from the amount supplied under the second positive pressure difference condition ΔP2, which is different from the first positive pressure difference condition ΔP1. Therefore, the amount of hydraulic fluid supplied from the second outer annular portion 50 to the second discharge hydraulic fluid path T2 also depends on the aforementioned positive pressure difference between the second outer annular portion 50 and the second hydraulic actuation chamber 110B, and thus varies accordingly. This relationship is shown below in the form of a mathematical equation.

[0060] X = The amount of hydraulic fluid discharged from the first hydraulic actuation chamber 110A and delivered to the second outer annular portion 50 (path B').

[0061] The first portion of Y = X recirculated from the first hydraulic actuation chamber 110A to the second hydraulic actuation chamber 110B (path R').

[0062] The second part of the discharge of Z = X in HFCV 10 (path T2)

[0063] ΔP = Hydraulic fluid pressure of the second outer annular portion 50 - Pressure of the second hydraulic actuation chamber 110B

[0064] X = Y + Z

[0065] When ΔP1 = 0.5 bar:

[0066] X = Y1 + Z1

[0067] When ΔP2 = 1 bar:

[0068] X = Y² + Z²

[0069] Where: Y2 > Y1 and Z2 < Z1

[0070] The above-described example of a positive pressure difference between the second outer annular portion 50 and the second hydraulic actuation chamber 110B illustrates how the amount of hydraulic fluid in the return hydraulic fluid path B' is distributed between the recirculation hydraulic fluid path R' and the second discharge hydraulic fluid path T2. In such an example of a positive pressure difference, the amount of fluid flow in the return hydraulic fluid path B' can be divided into two fluid flow rates: a first portion Y in the recirculation hydraulic fluid path R' and a second portion Z in the discharge hydraulic fluid path T2. The first portion Y can vary from zero to X, which is equal to the amount in the return hydraulic fluid path B'. The second portion Z can also vary from zero to X, which is equal to the amount in the return hydraulic fluid path B'. Referring to the two ΔP examples above, for an increasing positive ΔP spanning the second outer annular portion 50 and the second hydraulic actuation chambers 110A, 110B, the first portion Y increases, while the second portion Z decreases. Furthermore, for a decreasing positive ΔP, the first portion Y decreases, while the second portion Z increases. It can be said that the amount of recirculated hydraulic fluid delivered to the second hydraulic actuation chamber 110B via the recirculated hydraulic fluid path R' varies as needed.

[0071] Figure 11A A cross-sectional view of the HFCV 10 through the second discharge hydraulic fluid path T2 is shown, which extends from the second outer annular portion 50 of the valve core 40 to the retaining end 31 of the first opening 28 (or open end) of the valve housing 20. The second discharge hydraulic fluid path T2 comprises two symmetrically opposite paths, such as... Figure 11AAs shown in the diagram, along the path of the second discharge hydraulic fluid path T2, hydraulic fluid flows out from the second outer annular portion 50, through the first discharge through-hole 80 of the hydraulic sleeve 60, within the groove 79 of the hydraulic sleeve 60 extending axially along the first flow direction FD1, through the second discharge through-hole 81 of the hydraulic sleeve 60, through the spring recess 82 formed between the axial abutment 65 of the hydraulic sleeve 60 and the spring end 41 of the valve core 40, through the discharge port 66 arranged on the axial abutment 65, through the retaining ring recess 83 formed between the retaining ring 84 and the axial abutment 65, and through the inner opening region 86 of the retaining ring 84. The fluid discharged or discharged from HFCV 10 is then transported to the reservoir of a pressurized hydraulic fluid pressure source 35, such as an oil pump.

[0072] Figure 9B , Figure 10B and Figure 11B Different cross-sectional views of the HFCV 10 are shown when the HFCV 10 is in its first energized state and the valve core 40 is in its intermediate position. The intermediate position of the valve core 40 is achieved when the pulse width modulation solenoid assembly 12 applies a first force F1-A to the brake end 48 of the valve core 40 to overcome the biasing force Fb of the biasing spring 56. Figure 9B and Figure 10B As shown, neither the first outer annular portion 49 nor the third outer annular portion 51 overlaps with the first through-hole 71, 71' or the second through-hole 72, 72' of the hydraulic sleeve 60, thereby preventing: i) the flow of pressurized hydraulic fluid to either the first hydraulic actuation chamber 110A or the second hydraulic actuation chamber 110B; and ii) the flow of discharged hydraulic fluid from either the first hydraulic actuation chamber 110A or the second hydraulic actuation chamber 110B. Therefore, the intermediate position of the valve core 40 can be used to maintain the phasing position of the camshaft phase shifter 100, or in other words, to maintain the constant rotational position of the rotor 102 relative to the stator 104. When the valve core 40 is in the intermediate position, as previously stated... Figure 10A As described above, the first discharge hydraulic fluid path T1 is functional and causes hydraulic fluid to be discharged or discharged to the reservoir of the hydraulic fluid pressure source 35. As previously stated... Figure 10A and Figure 11A As described, the second discharge hydraulic fluid path T2 also functions; however, in this case, the second discharge hydraulic fluid path T2 will discharge hydraulic fluid caused by the internal leakage of the second outer annular portion 50 of the valve core 40 due to the flow of HFCV10, instead of discharging hydraulic fluid as described for... Figure 10A The hydraulic fluid described is discharged directionally from one of the first hydraulic actuation chamber 110A or the second hydraulic actuation chamber 110B.

[0073] The described intermediate position of the valve core 40 and the corresponding flow (or lack thereof) represent one of many design scenarios. In other example embodiments, a small amount of flow to or from the first hydraulic actuation chamber 110A and the second hydraulic actuation chamber 110B is possible.

[0074] Figure 9C , Figure 10C and Figure 11C Different cross-sectional views of the HFCV 10 are shown when the HFCV 10 is in the second energized state and the valve spool 40 is selectively moved to the fully displaced position. The following discussion describes the various hydraulic fluid paths and corresponding fluid connections that exist when the valve spool 40 is in this fully displaced position.

[0075] Figure 9C The cross-sectional view shows the inlet hydraulic fluid path A1 and the return hydraulic fluid path B1 of HFCV 10. Each of these described hydraulic fluid paths A1 and B1 is arranged opposite to each other within HFCV 10. In this fully displaced position of valve spool 40, pulse width modulation solenoid assembly 12 applies a second force F1-B to the actuator end 48 of valve spool 40 to overcome the biasing force Fb of bias spring 56. The second force F1-B is greater in magnitude than the aforementioned first force F1-A. Along the path of the inlet hydraulic fluid path A1, the hydraulic fluid flows from the hydraulic fluid pressure source 35, through the supply fluid port 22 of the valve housing 20, through the supply through-hole 70 of the hydraulic sleeve 60, through the fourth outer annular portion 52 and the third through-hole 53C of the valve core 40, and flows to the internal fluid chamber 58 of the valve core 40. Once the hydraulic fluid reaches the internal fluid chamber 58, the hydraulic fluid flows continuously and uninterruptedly toward the spring end 41 of the valve core along the first flow direction FD1 until it reaches the longitudinal position of the second through-hole 53B. The hydraulic fluid flows from the internal fluid chamber 58, through the second through-hole 53B and the third outer annular portion 51 of the valve core 40, through the first through-hole 71 of the hydraulic sleeve 60, and through the first fluid port 23 of the valve housing 20, and flows to the first hydraulic actuation chamber 110A.

[0076] Along Figure 9C The return hydraulic fluid path B1 is the path from the second hydraulic actuation chamber 110B, through the second fluid port 24 of the valve housing 20, through the second through-hole 72 of the hydraulic sleeve 60, and flows to the second outer annular portion 50 of the valve core 40. The hydraulic fluid flow from the second outer annular portion 50 can be directed to the second discharge hydraulic fluid path T2 or the recirculation hydraulic fluid path R1', which will now be referred to... Figure 10C Describe it.

[0077] Figure 10CThe inlet hydraulic fluid path A1', the return hydraulic fluid path B1', the first discharge hydraulic fluid path T1, the first portion of the second discharge hydraulic fluid path T2, and the recirculation hydraulic fluid path R1' are shown. Each of these hydraulic fluid paths A1', B1', T1, and T2 is arranged in opposite directions within HFCV 10.

[0078] Along the path of the inlet hydraulic path A1', hydraulic fluid flows from the hydraulic fluid pressure source 35, through the supply fluid port 22' of the valve housing 20, through the supply through-hole 70' of the hydraulic sleeve 60, through the fourth outer annular portion 52 and the third through-hole 53C of the valve core 40, and flows to the internal fluid chamber 58 of the valve core 40; once inside the internal fluid chamber 58, the hydraulic fluid flows continuously and uninterruptedly toward the spring end 41 of the valve core 40 along the first flow direction FD1 until it reaches the longitudinal position of the second through-hole 53B; before reaching the first hydraulic actuation chamber 110A, the hydraulic fluid flows from the internal fluid chamber 58 through the second through-hole 53B and the third outer annular portion 51 of the valve core 40, through the first through-hole 71' and the first fluid opening 76' of the hydraulic sleeve 60, and through the first fluid port 23' of the valve housing 20.

[0079] The phrase “uninterrupted continuous flow” is intended to describe the flow within a continuous hollow internal fluid chamber 58, which does not contain internal components around which the hydraulic fluid would have to flow, inside of which, or through which, to reach the longitudinal position of the second through-hole 53B.

[0080] Figure 10C The path of the first discharge hydraulic fluid path T1 is the same as the path previously targeted. Figure 10A and Figure 10B The path described for the first discharge hydraulic fluid path T1 is the same, therefore, no further discussion is needed.

[0081] Along Figure 10CThe return hydraulic fluid path B1' is the path through which hydraulic fluid flows from the second hydraulic actuation chamber 110B, through the second fluid port 24' of the valve body 20, through the second fluid opening 77' and the second through-hole 72' of the hydraulic sleeve 60, and to the second outer annular portion 50 of the valve core 40. The hydraulic fluid can be divided from the second outer annular portion 50 into two separate hydraulic fluid paths: a second discharge hydraulic fluid path T2 and a recirculation hydraulic fluid path R1'. The recirculation hydraulic fluid path R1' facilitates the efficient reuse of hydraulic fluid from the second hydraulic actuation chamber 110B to the first hydraulic actuation chamber 110A. The recirculation hydraulic fluid path R1' moves within the second outer annular portion 50 along the second fluid direction FD2, through the first recirculation through-hole 74', the first check valve 87A, and the first fluid opening 76' of the hydraulic sleeve 60, and through the first fluid port 23' of the valve body 20. The amount of hydraulic fluid supplied from the second hydraulic actuation chamber 110B to the first hydraulic actuation chamber 110A via the recirculated hydraulic fluid path R1' depends on the need or on the pressure difference between the second outer annular portion 50 of the valve core and the first hydraulic actuation chamber 110A. This is similar to the previous [measures / measures]. Figure 10A However, in the example embodiment, in order for flow to occur within the recirculating hydraulic fluid path R1' from the second outer annular portion 50 to the first hydraulic actuation chamber 110A, the hydraulic fluid pressure P3 of the second outer annular portion 50 is greater than the hydraulic fluid pressure P1 of the first hydraulic actuation chamber 110A. Furthermore, the amount of hydraulic fluid supplied from the second outer annular portion 50 (via the second hydraulic actuation chamber 110B) to the first hydraulic actuation chamber 110A under the first positive pressure difference condition ΔP1' differs from the amount supplied under the second positive pressure difference condition ΔP2', which is different from the first positive pressure difference condition ΔP1'. Therefore, the amount of hydraulic fluid supplied from the second outer annular portion 50 to the second discharge hydraulic fluid path T2 also depends on the positive pressure difference between the second outer annular portion 50 and the first hydraulic actuation chamber 110A, and thus varies accordingly. Figure 10A The mathematical equations and discussions provided for the recirculated hydraulic fluid volume and the discharged hydraulic fluid volume also apply to the previous discussion. Figure 10C The amount of recirculated hydraulic fluid and the amount of discharged hydraulic fluid are so specific that no further discussion is needed.

[0082] Figure 11C A cross-sectional view of the HFCV 10 through the second discharge hydraulic fluid path T2 is shown, which extends from the second outer annular portion 50 of the valve core 40 to the retaining end 31 of the first opening 28 of the valve housing 20. Figure 11C The second discharge hydraulic fluid path T2 is similar in flow path and function to the previous one. Figure 11AThe second discharge hydraulic fluid path T2 is the same as described, so no further discussion is needed.

[0083] The size and / or diameter of the through-hole and opening of the second discharge hydraulic fluid path T2 can be adjusted to regulate the amount of recirculation occurring within HFCV 10. This amount can depend on the magnitude of the camshaft torque acting on the camshaft phaser; for example, a higher camshaft torque may require a smaller discharge through-hole.

[0084] The flow paths shown in the accompanying drawings are arranged in pairs symmetrically with respect to the periphery of the cylindrical sleeve. In the example embodiment shown in the drawings, the transverse cutting plane that intersects the central axis 85 of the HFCV 10 and one of the flow paths also intersects a second instance of the same flow path. Other arrangements of the flow paths are also possible, including asymmetrical arrangements.

[0085] While exemplary embodiments have been described above, it is not intended that these embodiments describe all possible forms covered by the claims. The language used in this specification is descriptive rather than restrictive, and it should be understood that various changes may be made without departing from the spirit and scope of this disclosure. As previously described, features of various embodiments may be combined to form other embodiments that may not be explicitly described or illustrated. Although various embodiments may be described with respect to one or more desired characteristics as providing an advantage or superiority over other embodiments or prior art implementations, it is recognized by those skilled in the art that one or more features or characteristics may be compromised to achieve desired overall system properties depending on the specific application and implementation. These properties may include, but are not limited to, cost, strength, durability, life cycle cost, merchantability, appearance, packaging, size, suitability, weight, manufacturability, ease of assembly, etc. Therefore, to some extent, any embodiment described with respect to one or more characteristics as less desirable than other embodiments or prior art implementations that are not outside the scope of this disclosure and may be desirable for a particular application.

Claims

1. A hydraulic fluid control valve, comprising: Valve housing, the valve housing having: A first fluid port, configured to be fluidly connected to a first hydraulic actuation chamber; as well as, A second fluid port is configured to be fluidly connected to a second hydraulic actuation chamber, wherein the first hydraulic actuation chamber and the second hydraulic actuation chamber are configured to receive and discharge hydraulic fluid; A valve core, wherein the valve core is disposed within an opening in the valve housing, the valve core having: First opening; Second opening; Third opening; Outer ring portion; as well as, An internal fluid chamber configured to allow hydraulic fluid to flow from the first orifice to the second orifice, and from the first orifice to the third orifice; and, In the longitudinal direction of the valve core: The second orifice is arranged between the first orifice and the third orifice; The outer annular portion is arranged between the second orifice and the third orifice; and... The internal fluid chamber extends from the first orifice to the third orifice; and... In the first axial position of the valve core: The second orifice is configured to deliver hydraulic fluid to the first hydraulic actuation chamber; and, The outer annular portion is configured to receive hydraulic fluid from the second hydraulic actuation chamber and to deliver at least a portion of the hydraulic fluid from the second hydraulic actuation chamber to the first hydraulic actuation chamber; and, In the second axial position of the valve core: The third orifice is configured to deliver hydraulic fluid to the second hydraulic actuation chamber; and... The outer annular portion is configured to receive hydraulic fluid from the first hydraulic actuation chamber and to deliver at least a portion of the hydraulic fluid from the first hydraulic actuation chamber to the second hydraulic actuation chamber. It also includes a one-way valve disposed between the inner surface of the opening of the valve core and the valve housing, the one-way valve being configured to: i) allow hydraulic fluid to flow from the outer annular portion to the first hydraulic actuation chamber and the second hydraulic actuation chamber, and ii) prevent hydraulic fluid from flowing from the first hydraulic actuation chamber and the second hydraulic actuation chamber to the outer annular portion.

2. The hydraulic fluid control valve according to claim 1, wherein, The first orifice is located at the actuating end of the valve core, and the third orifice is located at the spring end of the valve core.

3. The hydraulic fluid control valve according to claim 2, wherein, The internal fluid chamber is configured to continuously fluidly connect any one of the three orifices to each other in the first and second axial positions of the valve core.

4. The hydraulic fluid control valve according to claim 1, wherein: In the first axial position of the valve core, the outer annular portion is configured to deliver the remainder of the hydraulic fluid from the second hydraulic actuation chamber to a discharge port arranged within the hydraulic fluid control valve; and, In the second axial position of the valve core, the outer annular portion is configured to deliver the remainder of the hydraulic fluid from the first hydraulic actuation chamber to a discharge port arranged within the hydraulic fluid control valve.

5. The hydraulic fluid control valve according to claim 4, wherein, The discharge port is fluidly connected to the axial end of the hydraulic fluid control valve.

6. The hydraulic fluid control valve according to claim 4, wherein, The first orifice is configured to receive hydraulic fluid from a pressurized hydraulic fluid source.

7. The hydraulic fluid control valve according to claim 1, wherein, The one-way valve opens radially outward to allow hydraulic fluid to flow from the outer annular portion to the first hydraulic actuation chamber and the second hydraulic actuation chamber.

8. The hydraulic fluid control valve according to claim 7 further includes a hydraulic sleeve, the hydraulic sleeve being radially arranged between the valve core and the valve body, and the check valve being arranged on the hydraulic sleeve.

9. The hydraulic fluid control valve according to claim 7, wherein, The valve housing also includes a third fluid port configured to fluidly connect the valve core to a pressurized hydraulic fluid source.

10. The hydraulic fluid control valve according to claim 9, wherein, The valve housing also includes a fourth fluid port configured as a discharge port, which is arranged in the longitudinal direction of the hydraulic fluid control valve between the third fluid port and the solenoid of the hydraulic fluid control valve.

11. A hydraulic fluid control valve, comprising: Valve housing, the valve housing having: A first fluid port, configured to be fluidly connected to a first hydraulic actuation chamber; as well as, A second fluid port is configured to be fluidly connected to a second hydraulic actuation chamber, wherein the first hydraulic actuation chamber and the second hydraulic actuation chamber are configured to receive and discharge hydraulic fluid; A valve core, wherein the valve core is disposed within an opening in the valve housing, the valve core having: First opening; Second opening; Third opening; Outer ring portion; as well as, An internal fluid chamber configured to allow hydraulic fluid to flow from the first orifice to the second orifice, and from the first orifice to the third orifice; and, In the longitudinal direction of the valve core: The second orifice is arranged between the first orifice and the third orifice; The outer annular portion is arranged between the second orifice and the third orifice; and... The internal fluid chamber extends from the first orifice to the third orifice; and... Under the first pressure state of the first hydraulic actuation chamber: The outer annular portion is configured to: i) receive a first amount of hydraulic fluid from the second hydraulic actuation chamber; and ii) deliver a first portion of the first amount of hydraulic fluid to the first hydraulic actuation chamber; as well as, Under a second pressure state in the first hydraulic actuation chamber, which is different from the first pressure state: The outer annular portion is configured to: i) receive the first amount of hydraulic fluid from the second hydraulic actuation chamber; and ii) deliver a second portion of the first amount of hydraulic fluid to the first hydraulic actuation chamber, the second portion being larger than the first portion. It also includes a one-way valve disposed between the inner surface of the opening of the valve core and the valve housing, the one-way valve being configured to: i) allow hydraulic fluid to flow from the outer annular portion to the first hydraulic actuation chamber and the second hydraulic actuation chamber, and ii) prevent hydraulic fluid from flowing from the first hydraulic actuation chamber and the second hydraulic actuation chamber to the outer annular portion.

12. The hydraulic fluid control valve according to claim 11, wherein: Under the first pressure state of the first hydraulic actuation chamber, the outer annular portion delivers a third portion of the first amount of hydraulic fluid to the discharge port of the hydraulic fluid control valve. and, Under the second pressure state of the first hydraulic actuation chamber, the outer annular portion delivers a fourth portion of the first amount of hydraulic fluid to the discharge port of the hydraulic fluid control valve, the fourth portion being smaller than the third portion.

13. The hydraulic fluid control valve according to claim 12, wherein, The discharge port is connected to the axial end of the hydraulic fluid control valve.

14. A hydraulic fluid control valve configured to be attached as a single unit to an internal combustion engine, the hydraulic fluid control valve comprising: coil; An armature, the armature being surrounded by the coil and configured to be actuated by a magnetic field generated by the coil; The sales pitch is attached to the armature; Valve housing, the valve housing having: A first radial fluid port, configured to be fluidly connected to a first hydraulic actuation chamber; A second radial fluid port, configured to be fluidly connected to a second hydraulic actuation chamber; as well as, A third radial fluid port, configured to be fluidly connected to a pressurized hydraulic fluid source; as well as, A valve core, disposed within an opening in the valve housing and actuated by the pusher, the valve core comprising: First external connection disk; Second external connection disk; An outer annular portion, formed by the first outer connecting plate and the second outer connecting plate, is configured to: i) recirculate hydraulic fluid from either the first or the second hydraulic actuation chamber to the other of the first or the second hydraulic actuation chamber; and ii) deliver hydraulic fluid to the discharge passage of the hydraulic fluid control valve; and, An internal fluid chamber configured to directly contact hydraulic fluid, the internal fluid chamber having a radial outer wall comprising: First opening; The second opening; and The third opening; and The internal fluid chamber is configured to continuously fluidly connect the first orifice, the second orifice, and the third orifice to each other; and The first and second outer connecting discs, the radial outer wall, and the first, second, and third orifices are all integrally formed with the valve core. It also includes a one-way valve arranged between the valve core and the inner radial surface of the opening in the valve housing.

15. The hydraulic fluid control valve according to claim 14, wherein, The discharge passage extends axially toward the spring end of the valve core and exits through the axial opening end of the hydraulic fluid control valve.

16. The hydraulic fluid control valve according to claim 14, further comprising a fixed hydraulic sleeve radially arranged between the valve core and the valve body, and the check valve arranged on the fixed hydraulic sleeve.

17. The hydraulic fluid control valve according to claim 16, wherein, The fixed hydraulic sleeve includes: At least one first fluid opening, the at least one first fluid opening being continuously fluidly connected to the first orifice; At least one second fluid opening, the at least one second fluid opening being configured to be fluidly connected to either the second orifice or the outer annular portion; At least one third fluid opening, said at least one third fluid opening being configured to be selectively fluidly connected to one of the third orifice or the outer annular portion; and, At least one fourth fluid opening, the at least one fourth fluid opening being configured to be continuously fluidly connected to the outer annular portion.

18. The hydraulic fluid control valve according to claim 17, wherein, The at least one fourth fluid opening is configured to be fluidly connected to both the first hydraulic actuation chamber and the second hydraulic actuation chamber.

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