Built-in electronically controlled valve assembly and electronically controlled damper including same

Abstract

The present invention provides a built-in electronically controlled valve assembly and an electronically controlled damper including the same, the built-in electronically controlled valve assembly according to an embodiment of the present invention includes an outer housing, a solenoid valve, an inner housing, a main poppet, a pilot poppet, a main seat, a control disc, and a main poppet retainer, and a main poppet retainer which is formed in the shape of a disc, has an edge portion formed by protruding downward, and is horizontally disposed between the main poppet and the control disc, and during a compression stroke, after the pressure of the working fluid flowing in through the hollow hole of the main seat is reduced in the process of passing through the space between the control disc and the main poppet retainer, the pressure of the working fluid is reduced. Therefore, the pilot valve has the advantage that the pressure of the compression pilot chamber can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to a built-in electronically controlled valve assembly and an electronically controlled damper including the same, and more particularly to a built-in electronically controlled valve assembly and an electronically controlled damper including the same, which can improve ride comfort by improving rebound lag generated as the damping force is progressive at a high flow rate in a hard mode during a compression stroke. Background Art

[0002] The structure of the conventional built-in electronically controlled damper is to change the damping force by changing the size of the orifice into which the current flows into the pilot chamber by moving the position of the spool in accordance with the current.

[0003] However, this structure has a problem that the damping force increases sharply in accordance with the flow rate because the size of the fixed orifice changes in accordance with the current.

[0004] In addition, the bobbin needs to move smoothly, so precision processing is required, resulting in a high product price, but there are problems that it is easily affected by foreign matter and an additional process is required to adjust the initial position of the bobbin.

[0005] In order to solve the aforementioned problems, a built-in electronically controlled damper which is easy to assemble and easy to control the damping force is proposed in the prior art.

[0006] Figure 1 1 is a diagram showing the structure of a built-in electronically controlled valve assembly used in an electronically controlled damper according to the prior art.

[0007] like Figure 1 As shown, the built-in electronically controlled valve assembly of the prior art includes: an outer housing 10, a solenoid valve 20, an inner housing 30, a pilot lift valve 40, a main lift valve 50, a control disc 70, a main seat 80, a soft valve 90, an upper cover 100 and a check valve 110.

[0008] The built-in electronically controlled valve assembly of the prior art as described above is separately formed with pilot chambers corresponding to the compression stroke and the extension stroke (3: compression pilot chamber, 4: extension pilot chamber), and the opening force of the main flow path is adjusted by controlling the pressure of these pilot chambers 3 and 4 corresponding to each stroke.

[0009] At this time, the hard damping force is controlled by controlling the pressures of the pilot chambers 3 and 4 , and the soft damping force is controlled by tuning the soft valve 90 .

[0010] Figure 2 It is shown Figure 1The FS (force-displacement) graph of the built-in electronically controlled valve assembly during the compression stroke in hard mode with high flow rate producing rebound lag as the damping force is progressive.

[0011] Figure 2 The horizontal axis represents the displacement of the piston rod in the up-down direction inside the cylinder of the damper in which the valve assembly with built-in electronic control is assembled.

[0012] also, Figure 2 The vertical axis represents the load generated by the resistance of the valve assembly installed at the end of the piston rod, and the load generated at the end of the piston rod is measured by a pressure sensor.

[0013] Since the flow path into the compression pilot chamber 3 is kept constant during the compression stroke of the built-in electronically controlled valve assembly, the damping force exhibits a progressively increasing characteristic when the flow rate increases.

[0014] That is, the working fluid flowing in through the hollow hole of the main seat 80 passes between the control disk 70 and the main poppet valve 50 at a constant pressure and flows into the pilot flow path formed in the main poppet valve 50 .

[0015] Therefore, the fluid fails to flow sufficiently into the upper chamber 1 of the cylinder, thereby causing a rebound hysteresis phenomenon in the hard mode.

[0016] Therefore, if Figure 2 As shown in the upper left end of the FS line graph, energy loss will occur during the stretching stroke, and there is a problem that the driving motion of the vehicle becomes unstable. Summary of the invention

[0017] Problem that the invention aims to solve

[0018] The present invention is proposed to solve the various existing problems as mentioned above. The purpose of the present invention is to provide a built-in electronically controlled valve assembly and an electronically controlled damper including the same, which can improve the riding comfort by improving the rebound lag generated by the progressive damping force under the high flow rate in the hard mode during the compression stroke.

[0019] Means used to solve problems

[0020] In order to achieve the above-mentioned purpose, the present invention provides a built-in electronically controlled valve assembly, characterized in that it includes: an outer shell, which reciprocates up and down inside the cylinder to divide the upper chamber and the lower chamber of the cylinder; an electromagnetic valve, which is located at the uppermost part of the internal space of the outer shell; an inner shell, which is arranged in the lower part of the electromagnetic valve inside the outer shell to form a main flow path connecting the upper chamber and the lower chamber of the cylinder; a main lift valve, which is arranged in the interior of the inner shell in a manner that can move up and down to open and close the main flow path; a pilot lift valve, at least a part of which is accommodated in the upper part of the main lift valve, according to the direction to the electromagnetic a main seat having a hollow hole formed in the center thereof and coupled to the open lower end of the inner shell to limit downward movement of the main lift valve; a control disk formed in a ring shape and horizontally arranged on the upper part of the main seat; and a main lift valve retainer formed in a disc shape with its edge portion protruding downward and horizontally arranged between the main lift valve and the control disk, wherein during the compression stroke, the working fluid flowing in through the hollow hole of the main seat has its pressure reduced during the process of passing between the control disk and the main lift valve retainer, and then flows into the pilot flow path formed on the main lift valve.

[0021] The main poppet valve retainer may include: a main body in a disc shape with a clamping hole formed at the center; and a protrusion formed to protrude downward along an edge of the main body.

[0022] The protrusion may include: an inner peripheral surface inclined downward from the edge bottom surface of the body toward the outside; and a bottom surface flatly extending toward the outside from the inner peripheral surface.

[0023] A clamping member in the shape of a rod with a predetermined length may be extended at the center of the bottom surface of the main poppet valve, and the clamping member may be inserted into a clamping hole formed on the main body of the main poppet valve retainer and a coupling hole formed at the center of the control disk.

[0024] The main poppet valve retainer may have a diameter smaller than a diameter of the control disk, and the main poppet valve retainer may be spaced apart from the control disk.

[0025] The present invention may include: a soft valve coupled to the lower portion of the outer shell.

[0026] The main flow path can be formed along an outer through hole and a first inner through hole, the outer through hole is formed in the outer shell, and the first inner through hole is formed on the inner shell at a height corresponding to the outer through hole, and the main flow path is opened and closed according to the pressure of the working fluid pushing the main lifting valve upward.

[0027] A stretching pilot chamber may be formed between the inner circumferential surface of the inner housing and the side of the main poppet valve, and during a stretching stroke, the pilot poppet valve may move up and down according to the control current to adjust the opening force of the main flow path.

[0028] A compression pilot chamber may be formed on an upper side of the pilot poppet valve, and during a compression stroke, the opening force of the main flow path may be adjusted using a force supported by the pilot poppet valve corresponding to the control current.

[0029] The main lift valve may include: a main lift valve body portion, which is formed with a accommodating portion for accommodating the pilot lift valve and a main lift valve flow path portion forming a pilot flow path; and a working fluid action portion, which extends from the lower end of the main lift valve body portion and is pressurized by the working fluid to open and close the main flow path.

[0030] The main lift valve flow path portion may include: a horizontal pilot flow path, which is connected to the stretching pilot chamber; a first vertical pilot flow path, whose lower end is connected to the horizontal pilot flow path and whose upper end is connected to the accommodating portion; and a second vertical pilot flow path, which passes through the main lift valve body portion in the up and down direction.

[0031] The first vertical pilot flow path and the second vertical pilot flow path may be communicated by pushing the pilot poppet valve upward.

[0032] The pilot poppet valve may include: a plunger rod support portion for seating an end of a plunger rod of the solenoid valve; and a guide flow path connecting the first vertical pilot flow path and the second vertical pilot flow path.

[0033] The working fluid acting portion may include: a guide wall formed to protrude downward from a lower end surface of the main poppet valve; and a guide groove formed on a radially inner side of the guide wall.

[0034] In another aspect, the present invention discloses an electronically controlled damper comprising the built-in electronically controlled valve assembly.

[0035] The details of other embodiments are included in the “Detailed Description” and the attached “Drawings”.

[0036] If with Figure 1 Advantages and / or features of the present invention and methods of achieving them will be clearly understood with reference to various embodiments described in detail below.

[0037] However, the present invention is not limited to the structures of the embodiments disclosed below, but can be implemented in various different forms. However, each embodiment disclosed in this specification is only to complete the disclosure of the present invention and fully inform the ordinary technicians in the technical field to which the present invention belongs. The scope of the present invention is only defined by the scope of each claim of the claims.

[0038] Effects of the Invention

[0039] According to the above-mentioned technical solution to the problem, the present invention has the following effects.

[0040] The present invention includes a main lift valve retainer, which is in the shape of a disk with an edge portion protruding downward and is horizontally arranged between the main lift valve and the control disk, so that during the compression stroke, the working fluid flowing in through the hollow hole of the main seat has its pressure reduced during the process of passing between the control disk and the main lift valve retainer, and then flows into the pilot flow path formed on the main lift valve, thereby having the effect of significantly reducing the pressure of the compression pilot chamber.

[0041] Thereby, the rebound hysteresis phenomenon can be prevented from occurring during the compression stroke, thereby avoiding the energy loss during the extension stroke, and the running motion of the vehicle can be stably improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a diagram showing the structure of a built-in electronically controlled valve assembly used in an electronically controlled damper according to the prior art.

[0043] Figure 2 It is shown Figure 1 FS graph of the built-in electronically controlled valve assembly during the compression stroke at high flow in hard mode with progressive damping force and rebound lag.

[0044] Figure 3 1 is a diagram showing the structure of a built-in electronically controlled valve assembly employed in the electronically controlled damper according to the present invention.

[0045] Figure 4 yes Figure 3 Magnified view of the inner housing, main poppet, main poppet retainer, control disc, and main seat.

[0046] Figure 5 It is shown in Figure 3 The figure shows a state in which the working fluid flowing in through the hollow hole of the main seat has its pressure reduced while passing between the control disk and the main poppet valve retainer, and then flows into the second vertical pilot flow path formed on the main poppet valve.

[0047] Figure 6is a diagram showing a main poppet valve retainer in a built-in electronically controlled valve assembly employed in an electronically controlled damper according to the present invention.

[0048] Figure 7 is a FS graph showing that the in-line electronically controlled valve assembly according to the present invention improves rebound lag at high flow in hard mode during the compression stroke as the damping force is degressive.

[0049] Figure 8 1 is a graph showing the relationship between pressure and flow rate in a hard mode, a middle mode, and a soft mode during a compression stroke of a built-in electronically controlled valve assembly according to the prior art and the present invention.

[0050] Description of Reference Numerals

[0051] 1: Upper chamber; 2: Lower chamber; 3: Compression pilot chamber; 4: Extension pilot chamber; 5: Horizontal pilot flow path; 6: First vertical pilot flow path; 7: Second vertical pilot flow path; 8: Compression pilot chamber inlet; 10: Outer shell; 20: Solenoid valve; 30: Inner shell; 40: Pilot lift valve; 50: Main lift valve; 60: Main lift valve retainer; 70: Control disk; 80: Main seat; 90: Soft valve DETAILED DESCRIPTION

[0052] Below, the preferred embodiments of the built-in electronically controlled valve assembly and the electronically controlled damper including the same according to the present invention will be described in detail based on the accompanying drawings. For reference, the terms or words used in this specification and the claims should not be interpreted in a limited manner to the general or dictionary meanings, but should be based on the principle that the inventor can appropriately define the concepts of the terms in order to explain his invention in the best way, so as to be consistent with the meaning and concept of the technical ideas of the present invention. In addition, the embodiments described in this specification and the structures shown in the accompanying drawings are only the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention. It should be understood that when submitting this application, there may be various equivalents and modifications that can be replaced.

[0053] Figure 3 1 is a diagram showing the structure of a built-in electronically controlled valve assembly used in an electronically controlled damper according to the present invention, Figure 4 yes Figure 3 Enlarged view of the inner housing, main poppet, main poppet retainer, control panel and main seat in the Figure 5 It is shown in Figure 3 The figure shows a state in which the working fluid flowing in through the hollow hole of the main seat has its pressure reduced while passing between the control disk and the main poppet valve retainer, and then flows into the second vertical pilot flow path formed on the main poppet valve.

[0054] The built-in electronically controlled valve assembly according to the present invention may include an outer housing 10 , a solenoid valve 20 , an inner housing 30 , a pilot poppet valve 40 , a main poppet valve 50 , a main poppet valve retainer 60 , a control disk 70 , a main seat 80 and a soft valve 90 .

[0055] The built-in electronically controlled valve assembly of the present invention is provided with pilot chambers 3 and 4 corresponding to the compression stroke and the extension stroke, respectively, and the opening force of the main flow path is adjusted by controlling the pressure of the pilot chambers 3 and 4 corresponding to each stroke.

[0056] In the present invention, the hard damping force can be controlled by controlling the pressures of the pilot chambers 3 and 4 , and the soft damping force can be controlled by tuning the soft valve 90 .

[0057] The outer housing 10 may be configured to be coupled to the end of a piston rod (not shown) to reciprocate up and down inside the cylinder in response to compression and tension, and to divide the inside of the cylinder into an upper chamber 1 and a lower chamber 2 .

[0058] The outer housing 10 has a space formed therein, and may be configured in a substantially cylindrical shape that is open downward.

[0059] The solenoid valve 20 , the inner housing 30 , the pilot poppet valve 40 , the main poppet valve 50 , the main poppet valve retainer 60 , the control disk 70 , and the main seat 80 may be coaxially disposed in the inner space of the outer housing 10 .

[0060] The soft valve 90 may be coupled to the opened lower end of the outer housing 10 .

[0061] An outer through hole 12 for allowing the working fluid to flow in and out may be formed on the side surface of the outer housing 10 along the periphery thereof.

[0062] The working fluid in the upper chamber 1 and the lower chamber 2 of the cylinder can flow mutually through a flow path formed inside the outer housing 10 .

[0063] A solenoid valve 20 may be disposed at the uppermost side of the inner space of the outer housing 10 .

[0064] The solenoid valve 20 may include a plunger 22 and a plunger rod 24 configured to move downward when a control current is applied.

[0065] The distal end of the plunger rod 24 may be seated on the plunger rod support portion 42 of the pilot poppet valve 40 , and pressurize the pilot poppet valve 40 downward in response to the control current.

[0066] In the present invention, the movement of the pilot poppet valve 40 is controlled by adjusting the control current applied to the solenoid valve 20, so that the opening force of the main flow path can be adjusted.

[0067] A compression pilot chamber 3 may be formed at a lower portion of the solenoid valve 20 .

[0068] An inner housing 30 may be disposed at a lower side of the solenoid valve 20 .

[0069] The inner case 30 may be configured to be fixed inside the outer case 10 by an auxiliary mold.

[0070] The inner housing 30 may form an internal space, and the pilot poppet valve 40 , the main poppet valve 50 , the main poppet valve retainer 60 , and the control disk 70 may be coaxially arranged in the internal space.

[0071] A main seat 80 may be disposed at a lower end of the inner housing 30 .

[0072] The inner housing 30 may be configured to be open at the top and bottom and to have a substantially cylindrical shape.

[0073] The internal space of the inner housing 30 can be divided into an upper section where the compression pilot chamber 3 is formed and a lower section where the tension pilot chamber 4 is formed.

[0074] The diameter of the lower section of the inner housing 30 may be formed to be larger than the diameter of the upper section.

[0075] In the inner space of the inner housing 30 , an upper section where the compression pilot chamber 3 is formed may be formed to have a diameter corresponding to the main poppet valve body 52 so as to accommodate and slide the main poppet valve body 52 .

[0076] The main poppet valve 50 may be disposed inside the inner housing 30 so as to be movable in the up-down direction.

[0077] The pilot poppet valve 40 may be disposed in an upper section of the inner housing 30 so as to be able to move up and down.

[0078] A main seat 80 for limiting downward movement of the main poppet valve 50 may be coupled to a lower end of the inner housing 30 , and the control disk 70 may be disposed between the main seat 80 and the main poppet valve retainer 60 .

[0079] In the lower section of the inner housing 30 , the tension pilot chamber 4 may be formed between the inner peripheral surface of the inner housing 30 and the main poppet valve body portion 52 .

[0080] In the upper section of the inner housing 30 , a compression pilot chamber 3 may be formed between the main poppet valve 50 and the solenoid valve 20 .

[0081] A first inner through hole 32 for forming a main flow path and a second inner through hole 34 for forming a tension pilot flow path may be formed on a side surface corresponding to the lower section of the inner housing 30 .

[0082] The first inner through hole 32 may be formed at a height corresponding to the outer through hole 12 of the outer housing 10 .

[0083] In addition, the second inner through hole 34 may be arranged on the side surface of the inner housing 30 at an upper side than the first inner through hole 32 .

[0084] During the stretching stroke, the working fluid in the upper chamber 1 of the cylinder can flow into and flow to the lower chamber 2 of the cylinder through the first inner through hole 32 and the second inner through hole 34. During the compression stroke, the working fluid in the lower chamber 2 can flow out to the upper chamber 1 through the first inner through hole 32.

[0085] The main poppet valve 50 is disposed inside the inner housing 30 so as to be movable up and down, thereby opening and closing the main flow path.

[0086] The main flow path may be formed along the outer through hole 12 of the outer housing 10 , the first inner through hole 32 of the inner housing 30 , the hollow hole 82 of the main seat 80 , and the valve hole (not shown) of the soft valve 90 .

[0087] Among them, the main flow path is closed by the main lifting valve 50 contacting the main seat 80 or the control disk 70 on the upper side of the main seat 80. When the main lifting valve 50 is pushed up by the working fluid, the main flow path can be opened by separating it from the main seat 80 or the control disk 70 on the upper side of the main seat 80.

[0088] The main poppet valve 50 may include a main poppet valve body portion 52 , a working fluid acting portion 54 , and a clamping member 56 .

[0089] Unexplained reference numerals 100 and 110 respectively denote an upper cover and a check valve provided on an upper portion of the main poppet valve 50 .

[0090] The main poppet valve body 52 may be configured to have a diameter corresponding to the upper section of the inner housing 30 so as to slide in the up-down direction relative to the inner peripheral surface of the upper section of the inner housing 30 .

[0091] On the other hand, since the diameter of the lower section of the inner housing 30 is formed larger than the diameter of the upper section, a space is formed between the inner peripheral surface of the lower section and the main poppet valve body 52 , and the extension pilot chamber 4 can be formed in the space.

[0092] The main poppet valve body 52 may have an accommodation portion 52 a formed recessed from a top surface thereof so as to accommodate the pilot poppet valve 40 .

[0093] At least a part of the pilot poppet valve 40 may be accommodated inside the accommodation portion 52 a and arranged so as to be able to move up and down.

[0094] The outer peripheral surface of the pilot poppet valve 40 is slidable relative to the inner peripheral surface of the accommodation portion 52 a .

[0095] The bottom surface of the accommodation portion 52 a may communicate with a first vertical pilot flow path 6 described later.

[0096] A compression pilot chamber 3 may be formed in an upper section of the inner housing 30 between the main poppet valve body 52 and the solenoid valve 20 .

[0097] A flow path portion of the main poppet valve 50 for forming a pilot flow path may be formed inside the main poppet valve body portion 52 .

[0098] The flow path portion of the main lifting valve 50 may include: a horizontal pilot flow path 5, which is connected to the stretching pilot chamber 4; a first vertical pilot flow path 6, whose lower end is connected to the horizontal pilot flow path 5 and the upper end is connected to the accommodating portion 52a; and a second vertical pilot flow path 7, which penetrates the main lifting valve body 52 in the up and down directions.

[0099] During the stretching stroke, a stretching pilot flow path can be formed along the outer through hole 12 of the outer shell 10, the second inner through hole 34 of the inner shell 30, the stretching pilot chamber 4, the horizontal pilot flow path 5, the first vertical pilot flow path 6, the second vertical pilot flow path 7, the hollow hole 82 of the main seat 80 and the valve hole (not shown) of the soft valve 90.

[0100] The clamp member 56 of the main poppet valve 50 is formed in a rod shape having a predetermined length and extending from the center of the bottom surface of the main poppet valve body portion 52 .

[0101] Such a clamping member 56 is to be inserted into a clamping hole 62 a formed in the main body 62 of the main poppet valve retainer 60 and a coupling hole (not shown) formed in the center of the control disk 70 .

[0102] On the other hand, during the compression stroke, a compression pilot flow path may be formed along the valve hole (not shown) of the soft valve 90 , the hollow hole 82 of the main seat 80 , and the second vertical pilot flow path 7 .

[0103] The unexplained reference numeral 8 indicates a compression pilot chamber inlet. (During the compression stroke, the working fluid flowing in through the hollow hole 82 of the main seat 80 is reduced in pressure during the process between the control disk 70 and the main lift valve retainer 60, and then flows into the second vertical pilot flow path 7 formed on the main lift valve 50 through the compression pilot chamber inlet 8).

[0104] The working fluid acting portion 54 may be formed at a lower end of the main poppet valve 50 and pressurized by the working fluid.

[0105] The working fluid acting portion 54 as described above may include: a guide wall 54 a formed to protrude downward from the lower end surface of the main poppet valve 50 ; and a guide groove 54 c formed on the radially inner side of the guide wall 54 a .

[0106] The outer peripheral surface of the guide wall 54 a may be formed as an inclined surface 54 b that is inclined upward toward the radially outer side.

[0107] During the extension stroke, the working fluid presses the outer peripheral surface of the guide wall 54 a radially inward, thereby pushing up the main poppet valve 50 . During the compression stroke, the working fluid presses the guide groove 54 c upward, thereby pushing up the main poppet valve 50 .

[0108] The pilot poppet valve 40 may be disposed inside a housing portion 52 a formed in the main poppet valve body 52 .

[0109] The pilot poppet valve 40 is slidable in the up-down direction relative to the inner peripheral surface of the accommodation portion 52 a.

[0110] The pilot poppet valve 40 may have a diameter corresponding to the diameter of the accommodation portion 52 a and be configured in a substantially cylindrical shape.

[0111] The pilot poppet valve 40 may include a plunger rod support portion 42 for placing an end of the plunger rod 24 of the solenoid valve 20 ; and a guide flow path 44 for connecting the first vertical pilot flow path 6 and the second vertical pilot flow path 7 .

[0112] The plunger rod supporting portion 42 may be formed at the center portion.

[0113] The pilot poppet valve 40 can be moved downward by the plunger rod 24 of the solenoid valve 20 .

[0114] The pilot poppet valve 40 can adjust the downward movement amount according to the magnitude of the control current applied to the solenoid valve 20 .

[0115] During the stretching stroke, the downward movement of the pilot lift valve 40 can be controlled by controlling the magnitude of the control current, thereby controlling the pressure of the stretching pilot chamber 4 .

[0116] During the compression stroke, with the lower surface of the pilot lift valve 40 in contact with the bottom surface of the accommodating portion 52a of the main lift valve 50, the pilot lift valve 40 and the main lift valve 50 are pressurized downward by the drive of the solenoid valve 20, thereby adjusting the pressure of the compression pilot chamber 3.

[0117] The lower surface of the plunger rod support portion 42 of the pilot poppet valve 40 is formed so as to cover the first vertical pilot flow path 6 communicating with the bottom surface of the accommodation portion 52 a of the main poppet valve 50 .

[0118] The lower surface of the plunger rod support portion 42 of the pilot poppet valve 40 can also be described as a pressure applying surface that is pressed upward by the working fluid flowing in through the first vertical pilot flow path 6 during the extension stroke.

[0119] The main poppet valve retainer 60 is formed in a disk shape with an edge portion protruding downward, and is horizontally disposed between the main poppet valve 50 and the control disk 70 .

[0120] On the other hand, the main seat 80 formed with the hollow hole 82 may be coupled to the open lower end of the inner housing 30 , and the ring-shaped control disk 70 may be disposed between the main seat 80 and the main poppet retainer 60 .

[0121] Next, a method for controlling the hard damping force in the built-in electronically controlled valve assembly according to the present invention will be described in detail.

[0122] In the present invention, the damping force of the damper can be adjusted by the opening force of the main flow path.

[0123] The opening force of the main passage can be described as the combined force of the force of the working fluid flowing along the main passage pushing the main poppet valve 50 upward and the force pushing the main poppet valve 50 downward in the opposite direction.

[0124] According to the present invention, the force for pushing the main poppet valve 50 downward may act differently during the extension stroke and during the compression stroke, respectively.

[0125] During the extension stroke, the pressure of the extension pilot chamber 4 , which changes with the movement of the pilot poppet valve 40 , may serve as a force that pushes the main poppet valve 50 downward.

[0126] Hereinafter, the opening force of the main flow path during the stretching stroke will be described in detail.

[0127] During the extension stroke, the working fluid of the upper chamber 1 of the cylinder may flow into the side of the main poppet valve 50 via the outer through-hole 12 of the outer housing 10 and the first inner through-hole 32 of the inner housing 30 .

[0128] The inflowing working fluid applies pressure to the working fluid action portion 54 formed at the lower end of the main poppet valve 50 . Since the outer peripheral surface of the working fluid action portion 54 is formed as an inclined surface 54 b , the main poppet valve 50 can be pushed upward by the pressure of the working fluid.

[0129] The working fluid flowing in through the outer through-hole 12 of the outer housing 10 can flow not only into the first inner through-hole 32 of the inner housing 30 , but also into the second inner through-hole 34 communicating with the tension pilot chamber 4 .

[0130] The working fluid flowing into the tension pilot chamber 4 through the second inner through hole 34 flows along the horizontal pilot flow path 5 and the first vertical pilot flow path 6 of the main poppet valve 50 , thereby pressing the pressure surface at the lower end of the pilot poppet valve 40 upward.

[0131] The pilot poppet valve 40 is pushed upward by the working fluid, and a passage is opened between the pilot poppet valve 40 and the main poppet valve 50 , so that the working fluid can flow to the lower chamber 2 of the cylinder through the extension pilot flow path.

[0132] At this time, due to the inflow of the working fluid, a predetermined pressure can be formed in the tension pilot chamber 4 .

[0133] On the other hand, when the control current is applied to the solenoid valve 20 , the pilot poppet valve 40 is pressed by the plunger rod 24 of the solenoid valve 20 to move downward, and the amount of movement can be adjusted according to the magnitude of the control current.

[0134] In the present invention, the amount of downward movement of the pilot poppet valve 40 is adjusted by controlling the magnitude of the control current applied to the solenoid valve 20 , thereby adjusting the pressure of the tension pilot chamber 4 .

[0135] Therefore, in the present invention, during the stretching stroke, the opening force of the main flow path can be adjusted by controlling the pressure of the stretching pilot chamber 4 corresponding to the control current applied to the solenoid valve 20, thereby adjusting the damping force.

[0136] Therefore, during the extension stroke, the combined force of the pressure of the working fluid pushing the main poppet valve 50 upward and the pressure of the extension pilot chamber 4 changing in accordance with the movement of the pilot poppet valve 40 can be used as the opening force of the main flow path.

[0137] During the stretching stroke, the working fluid in the main flow path and the stretching pilot flow path will flow to the lower chamber 2 of the cylinder via the soft valve 90 .

[0138] On the other hand, during the compression stroke, unlike during the extension stroke, one or more of the pressure of the compression pilot chamber 3 and the thrust acting by driving the solenoid valve 20 can be used as a force to push the main poppet valve 50 downward.

[0139] Hereinafter, the opening force of the main flow path during the compression stroke will be described in detail.

[0140] During the compression stroke, the working fluid of the lower chamber 2 of the cylinder can flow in through the valve hole (not shown) of the soft valve 90 .

[0141] The inflowing working fluid presses the guide groove 54 c of the main poppet valve 50 , thereby providing a force to push the main poppet valve 50 upward.

[0142] At the same time, the working fluid flowing into the valve hole (not shown) of the soft valve 90 flows along the second vertical pilot flow path 7 formed on the main lift valve body 52 into the compression pilot flow path formed on the upper side of the main lift valve 50, thereby forming the pressure of the compression pilot chamber 3.

[0143] Since the diameter of the guide groove 54 c of the main poppet valve 50 is formed larger than the diameter of the main poppet valve body 52 , the pressure acting on the guide groove 54 c for pushing up the main poppet valve 50 can be larger than the pressure of the compression pilot chamber 3 .

[0144] At this time, under the action of the working fluid flowing into the compression pilot chamber 3, the pilot poppet valve 40 is pushed downward and blocks the first vertical pilot flow path 6, thereby cutting off the flow of the working fluid.

[0145] On the other hand, in this state, if a control current is applied to the solenoid valve 20, the plunger rod 24 of the solenoid valve 20 supports the pilot lift valve 40 downward. Therefore, according to the control current of the solenoid valve 20, the force supported by the pilot lift valve 40 will also be used as a force to push the main lift valve 50 downward.

[0146] Therefore, in the present invention, during the compression stroke, the opening force of the main flow path is adjusted by using the pressure of the compression pilot chamber 3 and the downward pressure applied to the main lift valve 50 according to the control current applied to the solenoid valve 20, thereby adjusting the damping force of the damper.

[0147] Therefore, during the compression stroke, the combined force of the pressure of the working fluid pushing up the main lift valve 50, the pressure of the compression pilot chamber 3, and the downward pressure applied to the main lift valve 50 according to the control current applied to the solenoid valve 20 can be used as the opening force of the main flow path.

[0148] Figure 6 is a diagram showing a main poppet valve retainer in a built-in electronically controlled valve assembly employed in an electronically controlled damper according to the present invention.

[0149] The main poppet valve retainer 60 includes a main body 62 in a disk shape with a clamping hole 62 a formed at the center, and a protrusion 64 formed to protrude downward along the edge of the main body 62 .

[0150] At this time, the protrusion 64 includes an inner peripheral surface 64 a that is inclined downward from the edge bottom surface of the main body 62 to the outside, and a bottom surface 64 b that is flatly extended from the inner peripheral surface 64 a to the outside.

[0151] In addition, the diameter of the main poppet valve retainer 60 is formed to be smaller than the diameter of the control disk 70 , and the main poppet valve retainer 60 is arranged to be spaced apart from the control disk 70 .

[0152] During the compression stroke, the working fluid that flows in through the hollow hole 82 of the main seat 80 passes between the control disk 70 and the main lift valve retainer 60, and after the pressure is reduced due to the protrusion 64 of the main lift valve retainer 60 (the pressure is reduced due to the narrowing of the gap between the control disk 70 and the protrusion 64), it flows into the second vertical pilot flow path 7 formed on the main lift valve 50.

[0153] Figure 7 is a FS graph showing that the in-line electronically controlled valve assembly according to the present invention improves rebound lag as the damping force is degressive in high flow in hard mode during the compression stroke. Figure 8 1 is a graph showing the relationship between pressure and flow rate in a hard mode, a medium mode, and a soft mode during a compression stroke of a built-in electronically controlled valve assembly according to the prior art and the present invention.

[0154] Figure 7 The horizontal axis shows the vertical displacement of the piston rod inside the cylinder of the damper in which the built-in electronically controlled valve assembly is assembled.

[0155] also, Figure 7 The vertical axis represents the load generated by the resistance of the valve assembly installed at the end of the piston rod, and the load generated at the end of the piston rod is measured by a pressure sensor.

[0156] Since the flow path of the built-in electronically controlled valve assembly into the pilot chamber is narrowed by the main poppet valve retainer 60 during the compression stroke, it exhibits a characteristic of decreasing damping force as the flow rate increases.

[0157] That is, the working fluid flowing in through the hollow hole 82 of the main seat 80 has its pressure reduced while passing between the control disk 70 and the main poppet retainer 60 , and then flows into the second vertical pilot flow path 7 formed in the main poppet 50 .

[0158] Therefore, the fluid can sufficiently flow into the upper chamber 1 of the cylinder, so that the rebound hysteresis phenomenon in the hard mode as in the related art can be improved.

[0159] Thus, during the stretching stroke, Figure 7 As shown in the upper left end of the FS graph, the energy loss can be greatly reduced and the vehicle's driving motion can be stably achieved.

[0160] exist Figure 8 In the figure, numbers 1 and 1' represent the relationship between pressure and flow rate in hard mode, 3 and 3' represent the relationship between pressure and flow rate in soft mode, and 2 and 2' represent the relationship between pressure and flow rate in an intermediate mode between hard mode and soft mode.

[0161] Figure 8The pressure-flow curve can be obtained through the specified test equipment, where the flow rate is the input value and the pressure is the output value.

[0162] Right now, Figure 8 The graph shows the pressure achieved in real time with flow through the valve assembly.

[0163] 1 and 2 shown by dotted lines are conventional built-in electronically controlled valve assemblies that are not provided with a main poppet valve retainer, and exhibit a progressive characteristic with a steep slope.

[0164] On the other hand, 1 ′ and 2 ′ shown by solid lines are built-in electronically controlled valve assemblies according to the present invention provided with main poppet valve retainers, which exhibit slow-slope, degressive characteristics.

[0165] As described above, the present invention includes a main lift valve retainer 60, which is formed in a disc shape with an edge portion protruding downward, and is horizontally arranged between the main lift valve 50 and the control disk 70. During the compression stroke, the working fluid flowing in through the hollow hole 82 of the main seat 80 has its pressure reduced during the process of passing between the control disk 70 and the main lift valve retainer 60, and then flows into the second vertical pilot flow path 7 formed on the main lift valve 50, thereby having the advantage of being able to significantly reduce the pressure of the compression pilot chamber 3.

[0166] Thereby, the rebound hysteresis phenomenon can be prevented from occurring during the compression stroke, thereby avoiding the energy loss during the extension stroke, and the running motion of the vehicle can be stably improved.

[0167] The present invention described above is not limited to the embodiments and drawings, and a person skilled in the art will appreciate that various substitutions, deformations and changes may be made without departing from the technical concept of the present invention.

Claims

1. A built-in electronically controlled valve assembly, characterized in that: include: The outer shell reciprocates up and down inside the cylinder barrel to divide the upper chamber and the lower chamber of the cylinder barrel. a solenoid valve located at the uppermost portion of the inner space of the outer shell, The inner housing is arranged at the lower part of the solenoid valve inside the outer housing to form a main flow path connecting the upper chamber and the lower chamber of the cylinder. a main poppet valve disposed inside the inner housing in a manner capable of moving up and down to open and close the main flow path, A pilot poppet valve, at least a portion of which is accommodated in the upper portion of the main poppet valve, adjusts the opening force of the main flow path according to the control current applied to the solenoid valve, The main seat has a hollow hole formed in the center thereof and is coupled to the open lower end of the inner shell to limit the main poppet valve from moving downward. a control plate formed in a ring shape and arranged horizontally on the upper portion of the main seat, and A main poppet valve retainer is formed in a disc shape with its edge portion protruding downward, and is horizontally arranged between the main poppet valve and the control disc; During the compression stroke, the working fluid flowing in through the hollow hole of the main seat is reduced in pressure while passing between the control disk and the main poppet valve retainer, and then flows into the pilot flow path formed in the main poppet valve.

2. The built-in electronically controlled valve assembly according to claim 1, characterized in that: The main poppet valve retainer comprises: a main body in the shape of a disk with a clamping hole formed at the center; and The protrusion is formed by protruding downward along the edge of the main body.

3. The built-in electronically controlled valve assembly according to claim 2, characterized in that: The protrusion comprises: An inner peripheral surface that slopes downward from the edge bottom surface of the main body toward the outside; and The bottom surface is formed to extend flatly outward from the inner peripheral surface.

4. The built-in electronically controlled valve assembly according to claim 2, characterized in that: A clamping member in the shape of a rod of a predetermined length is extended and formed at the center of the bottom surface of the main poppet valve. The clamping member is inserted into a clamping hole formed on a body of the main poppet valve retainer and a coupling hole formed at a center of the control disk.

5. The built-in electronically controlled valve assembly according to claim 1, characterized in that: The diameter of the main poppet valve retainer is smaller than the diameter of the control disc, The main poppet valve retainer is spaced apart from the control disk.

6. The built-in electronically controlled valve assembly according to claim 1, characterized in that: include: A soft valve is combined with the lower portion of the outer shell.

7. The built-in electronically controlled valve assembly according to claim 1, characterized in that: The main flow path is formed along an outer through hole and a first inner through hole, the outer through hole is formed in the outer shell, and the first inner through hole is formed on the inner shell at a height corresponding to the outer through hole, and the main flow path is opened and closed according to the pressure of the working fluid pushing the main lift valve upward.

8. The built-in electronically controlled valve assembly according to claim 1, characterized in that: A tension pilot chamber is formed between the inner peripheral surface of the inner housing and the side portion of the main poppet valve. During the extension stroke, the pilot poppet valve moves up and down according to the control current, thereby adjusting the opening force of the main flow path.

9. The built-in electronically controlled valve assembly according to claim 1, characterized in that: A compression pilot chamber is formed on the upper side of the pilot poppet valve. During a compression stroke, an opening force of the main flow path is adjusted using a force supported by the pilot poppet valve corresponding to the control current.

10. The built-in electronically controlled valve assembly according to claim 1, characterized in that: The main lift valve comprises: a main poppet valve body portion having a housing portion for housing the pilot poppet valve and a main poppet valve flow path portion forming a pilot flow path; and The working fluid acting portion extends from the lower end of the main poppet valve body portion and is pressurized by the working fluid to open and close the main flow path.

11. The built-in electronically controlled valve assembly according to claim 10, characterized in that: The main poppet valve flow path portion comprises: a horizontal pilot flow path, communicating with the stretching pilot chamber; a first vertical pilot flow path, the lower end of which is connected to the horizontal pilot flow path, and the upper end of which is connected to the accommodation portion; and The second vertical pilot flow path penetrates the main poppet valve body in the up-down direction.

12. The built-in electronically controlled valve assembly according to claim 11, characterized in that: The first vertical pilot flow path and the second vertical pilot flow path are communicated by pushing the pilot poppet valve upward.

13. The built-in electronically controlled valve assembly according to claim 12, characterized in that: The pilot lift valve comprises: a plunger rod support portion, used to place the end of the plunger rod of the solenoid valve; and The guide flow path connects the first vertical pilot flow path and the second vertical pilot flow path.

14. The built-in electronically controlled valve assembly according to claim 10, characterized in that: The working fluid action part comprises: a guide wall formed to protrude downward from a lower end surface of the main poppet valve; and A guide groove is formed on the radial inner side of the guide wall.

15. An electronically controlled damper comprising the built-in electronically controlled valve assembly according to any one of claims 1 to 14.

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