Hydraulic connector for connecting an internal tube to a lateral solenoid valve and damper system

Abstract

The present invention relates to a hydraulic connector (14) which can be used to hydraulically connect a solenoid valve (7, 8) to one side of a second tube (2) of a damper system, the second tube (2) being inside a first tube (1), the solenoid valve (7, 8) being located on an outer side of the first tube (1). The invention further comprises the damper system which comprises a first chamber (13) inside the second tube (2), and a second chamber (12) between the second tube (2) and the first tube (1), such that the solenoid valve (7, 8) is configured to control the flow of liquid between the second chamber (12) and the first chamber (13), and the hydraulic connector (14) is configured to channel liquid between the first chamber (13) and the solenoid valve (7, 8), through an intermediate lateral through hole (23) in the second tube (2).

Description

[0001] DESCRIPTION

[0002] HYDRAULIC CONNECTOR FOR CONNECTING AN INTERNAL TUBE TO A SIDE SOLENOID VALVE AND SHOCK ABSORBER SYSTEM

[0003] OBJECT OF THE INVENTION AND TECHNICAL FIELD

[0004] The invention consists of a hydraulic connector, especially suitable for a damping system, comprising a tube located inside another tube, where it is required to regulate a flow of damping fluid between the chambers generated by the arrangement of said tubes and at least one solenoid valve.

[0005] The technical field in which the invention is found is that of hydraulically operated devices, in particular, hydraulic shock absorbers, and more specifically shock absorbers for vehicles, such as those used in automobiles.

[0006] BACKGROUND OF THE INVENTION

[0007] A shock absorber is a device designed to dampen the oscillations of a car's suspension until it returns to its equilibrium position by dissipating kinetic energy. In this way, the shock absorber significantly influences both the stability and comfort of a car. In fact, the adjustment of the hydraulic damping it generates represents a compromise between these two factors.

[0008] Stability: Dynamic vehicle control is achieved at low extension or compression speeds of the suspension and low oscillation frequencies, corresponding to the natural frequency of the sprung mass (passenger car), typically in the range of 1–1.5 Hz for passenger cars. This operating regime requires a high level of damping, i.e., high hydraulic loads.

[0009] Comfort: This is primarily related to medium and high extension and compression speeds of the suspension, which occur at medium to high oscillation frequencies. The reference frequency is the natural frequency of the unsprung mass (wheel suspension), typically in the 8-15 Hz range for passenger cars. A higher degree of comfort is achieved with a reduced level of damping, which decouples wheel movement from chassis oscillations. Therefore, it is desirable for the damper to be able to adjust its load level to the characteristics of the oscillations it is designed to dampen.

[0010] Electronic shock absorbers use solenoid valves to control the shock absorber's load level, adjusting it to the oscillations it needs to dampen. They also use an intermediate tube, concentric with the inner tube, to hydraulically connect the working chamber to the solenoid valve.

[0011] When the electronic shock absorber comprises two control solenoid valves, one to control compression movements and the other for extension movements, these solenoid valves can be located at the ends of the shock absorber tubes or in intermediate parts of them, at different heights in the shock absorber body, using two separate intermediate tubes separated by tonneau seals.

[0012] This arrangement occupies a certain space that is not always available in the vehicle or installation to be located, due to the presence of the suspension system elements, so it is necessary to place the solenoid valves in other positions that are not possible with current designs due to the limitations caused by the shock absorber components.

[0013] One of the problems encountered in designs where solenoid valves cannot be connected to the ends of the tubes that form part of the damping system is determined by the connection between the chambers of said damping system and the solenoid valves. In other words, the method of conveying the damping fluid from each of the chambers created by the tube arrangement to and from the solenoid valves, so that they can determine the level of damping of the system by regulating the flow rate through them.

[0014] This problem has been solved in different ways in the damping systems present in the state of the art, where the solenoid valves are located in intermediate parts of the outer tube, but in most cases, limiting the possible arrangement of said solenoid valves to specific orientations and / or positions.

[0015] EXPLANATION OF THE INVENTION

[0016] The invention consists of a hydraulic connector specially adapted for hydraulically connecting an intermediate solenoid valve to the side of a second tube of a damping system, the second tube being located inside a first tube, both tubes being straight in at least one section and oriented longitudinally, with the intermediate solenoid valve located on the outside side of the first tube. Preferably, the tubes are cylindrical and arranged concentrically.

[0017] Thus, it is understood that the damping system to which the hydraulic connector can be connected comprises technical characteristics similar to the dampers mentioned in the state of the art, which have solenoid valves to regulate the passage of damping fluid.

[0018] The hydraulic connection means that it can communicate or channel a fluid inside a pipe to the solenoid valve and vice versa. The term "intermediate" refers to the fact that the solenoid valve is located midway between the two ends of the pipe or pipes that make up the damping system.

[0019] In addition to the use indicated in shock absorber systems, the hydraulic connector could also be used for other systems where a hydraulic connection as defined is required, i.e., where it is necessary to hydraulically connect an external device, such as a valve, to a tube located inside another tube.

[0020] Based on the defined tubes, the damping system comprises a first chamber inside the second tube, and a second chamber between the second tube and the first tube, the solenoid valve being configured to regulate the flow of a liquid, preferably a damping liquid, between the second chamber and the first chamber.

[0021] The damping fluid can be an oil comprising a viscosity suitable for the required use.

[0022] The main difference of the hydraulic connector, compared to existing state-of-the-art systems, is that said connector is configured to channel fluid between the first chamber, through an intermediate lateral through-hole of the second tube, and the solenoid valve, as well as to connect to a perimeter of the intermediate lateral through-hole of the second tube by means of a watertight union, configured to prevent the passage of fluid between the first chamber and the second chamber, through said intermediate lateral through-hole.

[0023] In other words, the hydraulic connector can hydraulically connect the chamber located inside an inner tube (second tube) with a device (solenoid valve) located outside the outer tube (first tube), creating a channel for the passage of liquid, without generating contact between the two defined chambers.

[0024] In one embodiment, the hydraulic connector is configured to be located inside a transverse guide tube of the damping system, with a clearance from an inner surface of said transverse guide tube. This guide tube is rigidly attached at one end to an outer side of the first tube, and the solenoid valve is fixed at the other end. The defined clearance allows fluid to flow between the solenoid valve and the second chamber located between the tubes, through the inside of the transverse guide tube and the outside of the hydraulic connector. The transverse direction means that the tube is oriented perpendicular to the longitudinal direction of the first and second tubes.

[0025] In one embodiment, the hydraulic connector comprises:

[0026] - a guide element, comprising a tubular shape, configured to be rigidly fixed, at a second end, to the solenoid valve, wherein said guide element comprises an open tubular cavity, by means of a first opening located at a first end, and by means of at least one through hole, at the second end;

[0027] - an elastic element;

[0028] - a connecting element, annular in shape, comprising: or a peripheral section tightly joined to the tubular cavity of the guide element; or a first flat end base comprising a sealing area located on the outside of the tubular cavity of the guide element; or an axial through hole.

[0029] The elastic element is configured to press the sealing area of ​​the first flat end of the connecting element against a flat surface of the second tube. This surface contains the intermediate lateral through-hole of the second tube, which can be considered a flat hole since it is located on a flat surface. This creates a watertight seal between the two surfaces (i.e., between the flat surface and the sealing area), blocking the passage of damping fluid between the first and second chambers through the intermediate lateral through-hole. Preferably, the elastic element is located between the second end of the guide element, within the open tubular cavity, and a second end of the connecting element.

[0030] The axial through-hole of the connecting element is configured to channel fluid between the first chamber, through the intermediate lateral through-hole of the second tube, and the solenoid valve. The tight fit between the perimeter section of the connecting element and the tubular cavity of the guide element is configured to restrict fluid flow between this joint.

[0031] The term “restrict” is used to explain that the tight fit can limit or completely block the flow of fluid, depending on the use of the hydraulic connector, since, in some cases, the tight fit can also allow the flow of fluid between the two parts, in one or both directions.

[0032] The purpose of this design is to allow the hydraulic connector to absorb tolerances and misalignments from assembly or manufacturing, ensuring a correct connection between the damping system components. For example, if the flat face of the second tube is slightly inclined or rotated from its ideal position (where axial pressure would be exerted by the first flat end), due to the manufacturing and assembly process of all components, which requires very high dimensional and geometric precision, the hydraulic connector can adjust to this inclination or rotation. This adjustment is made by the pressure exerted by the elastic element, maintaining the necessary airtight seal to prevent fluid passing through the intermediate lateral through-hole from escaping into the second chamber.Clearly, the described design prevents minor misalignments, due to the manufacturing and / or assembly process, from affecting the watertight seal between the intermediate lateral through-hole and the axial through-hole of the connecting element that communicates with the solenoid valve. These minor misalignments are very common, especially in damper systems with three tubes arranged as described. The contact between the first flat end of the connecting element and the flat face of the second tube creates a hydraulic passage between the solenoid valve and the first chamber, separate from the second chamber, generating a pressure differential between the two chambers. As the pressure differential between the two chambers increases (higher pressure in the first chamber than in the second), a greater sealing force exists between the hydraulic connector and the second tube.

[0033] As can be easily understood, when the fluid in the damping system is pressurized within the second tube, for example, due to the movement of a piston rod, this fluid exits under pressure through the intermediate lateral through-hole of the second tube. It also passes through the axial through-hole of the connecting element and the through-hole at the other end of the guide element, reaching the solenoid valve. Depending on the configuration of this solenoid valve, some of the fluid passing through it is transferred to the second chamber at a lower pressure than that found in the first chamber.

[0034] As indicated, the guide element is configured to be rigidly attached to the solenoid valve, which, for the described operation of the hydraulic connector, must be rigidly attached to the transverse guide tube of the damping system, which in turn must be rigidly attached to the first tube.

[0035] In one embodiment, the tight connection between the perimeter section of the connecting element and the tubular cavity of the guide element is a ball-and-socket joint that allows relative rotation between the two. This feature allows the connecting element to be oriented, orbiting in any direction, with respect to the guide element, within limits determined by the size and characteristics of the elements described, so that the first flat end base is tightly and airtightly fitted to the flat surface of the second tube, even with minor misalignments such as those mentioned.

[0036] For example, if the axis of the intermediate lateral through-hole in the flat surface of the second tube does not align with the axis of the open cylindrical cavity of the guide element, the connecting element can be slightly rotated so that its axial through-hole aligns with the intermediate lateral through-hole, allowing the damping fluid to pass through. The elastic element can be configured to deform both axially and angularly to ensure that the first flat end of the connecting element is aligned with and in contact with the flat face of the second tube.

[0037] It should be noted that, during assembly of the described damping system, the second tube may have free axial and angular movement relative to the first tube, and its position is determined by the position of the solenoid valve(s). Therefore, it is necessary to accommodate the various manufacturing and assembly tolerances. Most current systems use solenoid valves with sufficient separation between them, allowing the use of two independent tubes hydraulically connected to each of the two solenoid valves (one for tension and one for compression) instead of the second tube.Therefore, in the described state-of-the-art systems, in the case of having two intermediate solenoid valves connected to the same second tube, it is necessary to be able to absorb manufacturing tolerances, since, once the second tube is positioned with respect to a solenoid valve, the hydraulic connection with both solenoid valves must be ensured, absorbing these possible positional misalignments.

[0038] In one embodiment, the elastic element is an element selected from the group comprising: a helical spring, a compression spring, a wave spring, and an elastomeric element whose design and material ensure that it can deform when a load is applied and subsequently recover its previous state.

[0039] In one embodiment, the sealing area of ​​the first flat end base of the connecting element, located on the outside of the tubular cavity of the guide element, comprises at least one open groove that surrounds, totally or partially, the axial through-hole of the connecting element, wherein said groove is configured to channel a liquid between said sealing area and the flat surface of the second tube, when said sealing area is pressing the flat surface generating the airtight joint.

[0040] This groove, channel, or series of grooves or channels is located on the first flat end of the connecting element, that is, on the contact face of the connecting element with the flat surface of the second tube. This improves the seal by creating a labyrinth seal, forcing the damping fluid to travel a long and difficult path to pass between the two surfaces. This type of seal, known as a "labyrinth," is commonly used in hydraulic systems. It works because the pressure required to force the fluid through these channels is much greater than the pressure required for it to pass through an alternative path.

[0041] In one embodiment, the hydraulic connector comprises an axial sealing gasket located between the first flat end base of the connecting element, surrounding the axial through-hole of the connecting element.

[0042] This axial sealing gasket can be inserted into a cavity of similar size in the first flat end of the connecting element to improve the fit between the parts to be sealed. This axial sealing gasket allows for a tighter seal between the contacting components, as it can deform slightly due to the elastic element.

[0043] In one embodiment, the hydraulic connector comprises a perimeter sealing gasket, elastic and press-fitted between the perimeter section of the connecting element and the open tubular cavity of the guide element. This perimeter sealing gasket can be included to achieve a completely watertight seal, and furthermore, the perimeter section of the connecting element can comprise a perimeter recess suitable for housing said sealing gasket and preventing it from displacing from its operating position.

[0044] Since this perimeter sealing gasket is made of an elastic material, it could deform sufficiently, under a specific pressure, and if necessary, even allow fluid to pass between the perimeter section of the connecting element and the open tubular cavity of the guide element. "Fluid" here refers to both liquid and gas.

[0045] In an alternative embodiment in which the hydraulic connector does not have this perimeter sealing gasket, the perimeter section of the connecting element could comprise an elastic part, which would allow a tight fit with the open tubular cavity of the guide element.

[0046] In one embodiment, the perimeter sealing gasket comprises a U-shaped section, with a movable flange configured to deform elastically due to pressure exerted by a liquid flow passage, solely in an axial direction, between the perimeter section of the connecting element and the open tubular cavity of the guide element.

[0047] In other words, with the hydraulic connector connected to the solenoid valve and the tubing of a damping system, this movable tab allows fluid from the second chamber to flow back into the intermediate solenoid valve. This way, the fluid can follow the reverse path of what it does when the pressure in the first chamber is higher than that in the second chamber, as described earlier, flowing from the second chamber to the solenoid valve and then back to the first chamber.

[0048] This situation can occur in certain operating conditions of the damping system, such as at high speeds, where it is desirable to allow some reverse flow of damping fluid from the second chamber to the first when the pressure in the second chamber is higher. To achieve this, the perimeter seal used is a flanged or liped gasket that blocks the flow of damping fluid in one direction but allows it in the other.

[0049] When the pressure in the first chamber is greater than in the second chamber, the fluid pressure separates the flange or lips of the sealing gasket, preventing the passage of damping fluid between the two chambers.

[0050] When the pressure in the first chamber is lower than in the second chamber, the fluid pressure deforms the movable flange, or outer lip, of the perimeter sealing gasket, allowing a flow of damping fluid from the second chamber to the first chamber.

[0051] In one embodiment, particularly suitable when the solenoid valve is a pull-type solenoid valve, the first flat end base of the connecting element comprises a thrust area, peripherally located outside the sealing area, situated at a first separation distance from the sealing area in a direction normal to said sealing area. That is, as if there were a step between the thrust area and the sealing area, it being preferable that both areas be parallel, but not essential.

[0052] When the sealing area is in contact with the flat surface of the second tube, the thrust area is located a distance from the flat surface, forming a channel configured to carry liquid. Thus, the connecting element is configured to move, relative to the guide element, in a direction normal to the thrust area, in a compressive direction, when a pressure is applied to the thrust area that is greater than the pressure exerted on the connecting element in the opposite direction.

[0053] That is, when the liquid pressure in the second chamber is greater than the liquid pressure in the first chamber, the liquid located in the channel between the thrust area and the flat surface can generate such a high pressure on the thrust area that it displaces the connecting element in the opposite direction to that pushed by the elastic element, leaving the intermediate lateral through-hole unblocked, allowing the exchange of liquid between the first and second chambers, through said hole, until the pressures are equalized, without the need for it to pass through the solenoid valve.

[0054] The relationship between the thrust area and the internal area of ​​the connecting element, along with the strength of the elastic element, controls the minimum opening pressure of the connecting element. In other words, the connecting element will move in a compressive direction depending on the fluid pressure in the first and second chambers, thus allowing for rapid fluid recovery in the first chamber.

[0055] Another embodiment of the invention consists of a damping system comprising the hydraulic connector defined in any of the preceding embodiments. That is, a damping system comprising a hydraulic connector that in turn comprises any of the previously defined features, since none of these are incompatible.

[0056] In this embodiment, the damping system comprises:

[0057] - the first tube which is an outer tube of the shock absorber system; - a third tube which is an inner tube of the shock absorber system;

[0058] - the second tube which is an intermediate tube of the shock absorber system, located between the outer tube and the inner tube;

[0059] - a stem configured to move in a straight longitudinal direction relative to the outer tube;

[0060] - a piston attached to a first end part of the rod, displaceable in the longitudinal direction, through an interior of the inner tube, between a first end and a second end of said inner tube;

[0061] - a traction chamber located inside the inner tube, between the piston and the first end of the inner tube;

[0062] - a compression chamber located inside the inner tube, between the piston and the second end of the inner tube;

[0063] - the second chamber, which is an expansion chamber located between the outer tube and the intermediate tube;

[0064] - the first chamber, which is an intermediate chamber located between the intermediate tube and the inner tube;

[0065] - damping fluid, configured to flow between the chambers of the damping system; and

[0066] - the at least one intermediate solenoid valve that is a compression solenoid valve or a traction solenoid valve, configured to limit the longitudinal displacement of the stem, in the compression and expansion directions, respectively.

[0067] The inner tube, the outer tube, and the intermediate tube are straight, oriented in a longitudinal direction, rigidly joined together, and preferably arranged concentrically.

[0068] As can be inferred from the operation of the damping system, the size or internal volume of the tension and compression chambers varies depending on the movement of the piston and rod. If the damping rod extends, or extends, relative to the tube assembly (inner, intermediate, and outer), the fluid in the tension chamber is channeled to the upper part of the intermediate chamber, as these chambers are connected by an internal orifice at the top. Conversely, if the rod compresses, the fluid in the compression chamber is pushed to the lower part of the intermediate chamber, as these chambers are connected by an internal orifice at the bottom. In both movements, the size or volume of the tension and compression chambers varies, expanding and contracting accordingly, directly and proportionally.

[0069] The solenoid valve is attached to a section of the outer tube, in an intermediate part located between two ends of said outer tube, and is configured to limit the longitudinal displacement of the stem by regulating a flow of damping fluid between the first chamber and the second chamber.

[0070] For example, if the intermediate solenoid valve, also called a side solenoid valve, is a pull-type solenoid valve, it is attached to a section or region of the outer tube and is configured to control the flow of damping fluid between the first and second chambers. Specifically, it controls the flow of damping fluid from the first chamber, which is pushed by the fluid in the pull-type chamber when the stem extends.

[0071] The hydraulic connector is configured for:

[0072] - channel damping fluid between the intermediate chamber and the solenoid valve; and

[0073] - to regulate or restrict the flow of damping fluid between the first chamber and the second chamber at the connection between the hydraulic connector and the intermediate tube.

[0074] In this way, the intermediate solenoid valve can be positioned to one side of the outer tube, allowing the damping fluid from the first chamber to be directed to the intermediate solenoid valve without mixing with the damping fluid in the second chamber. This configuration is quite complex and ingenious because the second chamber surrounds the intermediate chamber on its side, where the intermediate solenoid valve is connected.

[0075] The fact that the hydraulic connector is configured to "regulate" or "restrict" fluid flow does not mean that it is always blocking the flow of damping fluid between the first and second chambers (at the connection with the intermediate solenoid valve). Rather, it can do so depending on the use or needs of the damping system. For example, the hydraulic connector typically blocks the flow of damping fluid between the first and second chambers, so that all the damping fluid exchanged between these chambers passes through the corresponding solenoid valve, depending on the direction of the piston rod's movement. This allows the resistance to the piston rod's movement to be greater or lesser depending on the flow rate permitted by the valve.On the other hand, if required, the hydraulic connector can allow the first and second chambers to communicate with each other, at the connection with the intermediate tube, without the need for the damping fluid to pass through said intermediate solenoid valve, allowing the exchange of fluid, equalizing pressures between both chambers.

[0076] This damping system may comprise two intermediate solenoid valves, one for tension and one for compression, or it may have one intermediate valve and one located at one end of the tubes, depending on the design requirements.

[0077] In an embodiment in which the hydraulic connector comprises the guide element, the elastic element and the connecting element, as previously defined, the intermediate tube comprises the flat surface, in an intermediate part, comprising the intermediate lateral through hole that communicates the intermediate chamber with the solenoid valve.

[0078] In an embodiment where the damping system comprises the hydraulic connector, and where the first flat end base of the connecting element includes a thrust area, the solenoid valve of said damping system is a pull-type solenoid valve. This is because the configuration of releasing the intermediate lateral through-hole of the connecting element when the pressure in the second chamber is significantly higher than that in the first chamber is particularly suitable for connection with a pull-type solenoid valve. This is due to the need to fill the pull-type chamber with fluid from the second chamber when the piston rod undergoes a compression movement, unlike during expansion, where the compression chamber receives fluid from the second chamber via the valve support.

[0079] Thus, with the sealing area of ​​the connecting element in contact with the flat surface of the intermediate tube, the connecting element is configured to move in a direction normal to said sealing area, with respect to the guide element, separating the sealing area from the flat surface of the intermediate tube, generating a passage for the exchange of damping fluid between the expansion chamber and the intermediate chamber, when the damping fluid of the expansion chamber exerts a pressure on the thrust area greater than the pressure exerted by the elastic element and the damping fluid, in the opposite direction, on the connecting element.

[0080] In state-of-the-art electronic dampers, which comprise two intermediate control solenoid valves, the tension solenoid valve is equipped with a device that allows a return flow of damping fluid from the expansion chamber to the tension intermediate chamber during the compression stroke of the piston rod. Therefore, in most current designs, the tension and compression solenoid valves are separate.

[0081] With the defined embodiment, in which the first flat end base of the connecting element comprises a thrust area, this return flow of damping fluid can be carried out through the hydraulic connector of the solenoid valve itself with the intermediate tube, thereby simplifying the traction solenoid valve and allowing the same solenoid valve design to be used for both traction and compression.

[0082] In one embodiment, the damping system comprises at least one transverse guide tube rigidly fixed to the outer tube, preferably oriented transversely to the longitudinal direction of the outer tube. The hydraulic connector is located inside this transverse guide tube, with sufficient clearance to channel a flow of damping fluid between the solenoid valve and the second chamber.

[0083] In one embodiment, the damping system comprises two intermediate solenoid valves, a first intermediate solenoid valve that is the traction solenoid valve and a second intermediate solenoid valve that is the compression solenoid valve.

[0084] In one embodiment, the intermediate tube comprises two flat surfaces, located at different intermediate points along the tube, each comprising an intermediate lateral through-hole (which can be considered a flat through-hole) connecting the first chamber to the second chamber. The damping system thus comprises two hydraulic connectors, each connected to one of two solenoid valves located at intermediate points along the outer tube.

[0085] In one embodiment, the inner tube comprises at least one upper inner orifice that connects the damping fluid between the tension chamber and the first chamber, and at least one lower inner orifice that connects the damping fluid between the compression chamber and the first chamber. Therefore, intermediate solenoid valves control the flow of damping fluid between the first and second chambers, because both the fluid from the compression chamber and the tension chamber flow to the first chamber.

[0086] In one embodiment, the damping system comprises a valve support connected to a lower end portion of the outer tube. This valve support can regulate the flow of damping fluid between the different chambers to equalize or release pressure.

[0087] BRIEF DESCRIPTION OF THE DRAWINGS

[0088] To complete the description and to aid in a better understanding of the characteristics of the invention, this descriptive document is accompanied, as an integral part thereof, by figures which, for illustrative and non-limiting purposes, depict the following:

[0089] - Figure 1 A.- Shows a perspective view of the hydraulic connector.

[0090] - Figure 1 B.- Shows a cross-sectional elevation view of the hydraulic connector in Figure 1 A, where the shape and arrangement of the components of said hydraulic connector can be seen.

[0091] - Figure 1 C.- Shows a profile view of the hydraulic connector, with a representation of the plane cut that has been represented in view 1 B.

[0092] - Figure 1D.- Shows an exploded view of the hydraulic connector shown in Figure 1A.

[0093] Figure 2 shows a partially cut elevation view of an intermediate solenoid valve connected to a hydraulic connector. Figure 3A shows a perspective view of a damping system comprising two intermediate solenoid valves, one for tension and one for compression, arranged at different heights relative to the tubes.

[0094] - Figure 3B.- Shows a half-section elevation view of the damping system shown in Figure 3A, in which the arrangement of the connecting element with respect to the solenoid valves can be seen.

[0095] Figure 4A.- Shows a plan view of the damping system shown in Figure 3B, where it can be seen that the sealing area of ​​the first flat end base of the connecting element is in contact with the flat surface of the second tube generating a watertight joint between them, with the axis of the intermediate lateral through hole coinciding with the axis of the axial through hole of the connecting element.

[0096] Figure 4B.- Shows a plan view of the damping system, as shown in Figure 4A, but where the flat surface of the second tube is slightly inclined, rotated or tilted, an angle with respect to that shown in Figure 4A, such that the connecting element is also tilted or inclined at the same angle to maintain airtight contact between the sealing area of ​​the first flat end base of the connecting element and the flat surface of the second tube, where the intermediate side through hole is located.

[0097] Figure 5A.- Shows a detailed view of Figure 4A which allows a better appreciation of the position of the sealing area of ​​the first flat end base of the connecting element and the flat surface of the second tube.

[0098] Figure 5B.- Shows a detailed view of Figure 4B, which allows a better appreciation of the position of the sealing area of ​​the first flat end base of the connecting element and the flat surface of the second tube, this flat surface being slightly inclined, with respect to what would be an ideal position of use.

[0099] Figure 6A shows a detailed view of a connecting element comprising two small open slots that completely surround the axial through-hole of the connecting element. A perimeter elastic sealing gasket, press-fitted between the perimeter section of the connecting element and the tubular cavity of the guide element, is also visible.

[0100] Figure 6B.- Shows a view similar to that shown in Figure 6A, but instead of having two small open slots, it shows an axial sealing gasket located between the first flat end base of the connecting element and the flat surface of the second tube, surrounding the axial through hole of the connecting element.

[0101] - Figure 6C.- Shows a view similar to that shown in Figure 6A, where an elastic perimeter sealing joint comprises a U-shaped section with a movable flange.

[0102] Figure 6D.- Shows a view similar to that shown in Figure 6C, where the first flat end base of the connecting element comprises a thrust area, peripheral outside the sealing area, located at a first separation distance from the flat surface of the second tube.

[0103] Figure 7.- Shows a partial view, in elevation, cut in half, of a damping system, with a first intermediate solenoid valve, which is a traction solenoid valve, located in an upper part, and a second intermediate solenoid valve which is a compression solenoid valve.

[0104] Figure 8A.- Shows a detailed view of the intermediate solenoid valves in Figure 7.

[0105] Figure 8B.- Shows a detailed view of the first intermediate solenoid valve of Figure 7, where the sealing area of ​​the first flat end base of the connecting element is not in contact with the flat surface of the second tube.

[0106] List of elements shown in the figures:

[0107] 1. First tube (Outer tube in the shock absorber system)

[0108] 2.- Second tube (Intermediate tube in the shock absorber system)

[0109] 3. Third tube (Inner tube of the shock absorber system)

[0110] 4.- Stem

[0111] 5.- Piston

[0112] 6.- Transverse guide tube

[0113] 7.- Compression solenoid valve

[0114] 8.- Traction solenoid valve

[0115] 9.- Valve support

[0116] 10.- Traction camera

[0117] 1 1 .- Compression chamber

[0118] 12.- Second chamber (Damp-absorbing system expansion chamber)

[0119] 13.- First chamber (Intermediate chamber of the shock absorber system) 14.- Connect hydraulic

[0120] 15.- Guiding Element

[0121] 16.- Elastic element

[0122] 17.- Connecting element

[0123] 171. - Thrust area

[0124] 172.- Sealing area

[0125] 18.- Perimeter sealing joint

[0126] 181 .- Mobile tab

[0127] 19.- Axial sealing joint

[0128] 20.- Inner top hole

[0129] 21.- Lower inner hole

[0130] 22. Flat surface

[0131] 23.- Intermediate lateral through hole

[0132] 24.- Slot

[0133] PREFERRED EMBODIMENT OF THE INVENTION

[0134] The present invention consists of a hydraulic connector (14), as shown in Figures 1A to 1D, and a damping system, as shown in Figures 3A and 3B comprising the hydraulic connector (14).

[0135] Thus, in a preferred embodiment, the damping system comprises two solenoid valves (7, 8). A compression solenoid valve (7) and a tension solenoid valve (8) are configured to control the flow of damping fluid between the first chamber (13) and the second chamber (12). These valves adjust the pressure opposing the longitudinal displacement of the piston rod (4) in the compression and expansion directions, respectively. Both solenoid valves (7, 8) are called intermediate solenoid valves because they are connected to different sections of a first tube (1), which is an outer tube of the damping system. These sections are located at different intermediate points along this outer tube.

[0136] As can be seen, the shock absorber system is of the type comprising a second tube (2), which is an intermediate tube located between the outer tube and a third tube (3), which is an inner tube of the shock absorber system, all of them straight, cylindrical, arranged concentrically, rigidly joined at their ends by means of a retainer or stop, by an upper end part, which acts as a cap, and by a valve support (9), by a lower end part of said tubes (1, 2, 3).

[0137] Like most damping systems, the damping system of the invention also comprises a rod (4) configured to move in the straight longitudinal direction with respect to the tubes (1, 2, 3), with a piston (5) attached to a first end part of the rod (4), also movable in the longitudinal direction in a way that is integral with the rod (4), through an interior of the third tube (3), between the first end and the second end of said third tube (3).

[0138] The arrangement of the defined tubes (1, 2, 3), as well as the piston, determines the chambers of the damping system. As can be seen in Figure 3B, the system comprises a tension chamber (10), located inside the third tube (3), between the piston (5) and the first (upper) end of the third tube (3); a compression chamber (11), located inside the third tube (3), between the piston (5) and the second (lower) end of the third tube (3); a second chamber (12), consisting of an expansion chamber, located between the first tube (1) and the second tube (2); and a first chamber (13), consisting of an intermediate chamber located between the second tube (2) and the third tube (3).

[0139] Inside these chambers (10-13) flows a damping fluid, preferably oil, since it is suited, due to its conditions, to the normal needs of damping use.

[0140] The function of the described damping system is to regulate or limit the longitudinal displacement of the stem (4) with respect to the tubes (1, 2, 3), by regulating the flow of damping fluid that flows between the first chamber (13) and the second (12). These flows must pass through a solenoid valve (7, 8) whether the stem (4) is moving in the expansion or compression direction.

[0141] Referring to Figure 3B, it can be seen that the fluid in the compression chamber (11) is displaced into the first chamber (13) (intermediate chamber) through a lower internal orifice (21) in the inner tube (3) when the piston rod (4) undergoes compression. Specifically, it is displaced to the lower part of the first chamber (13). The damping fluid from this first chamber (13) is channeled, due, for example, to the geometry of the second tube (2), to the compression solenoid valve (7), passing through an intermediate lateral through-hole (23) in this second tube (2) and a hydraulic connector (14). Depending on the configuration of the compression solenoid valve (7), a greater or lesser flow rate of damping fluid will be allowed, depending on the required stability and comfort, which will determine a greater or lesser displacement of the piston rod (4) relative to the tubes (1, 2, 3).The damping fluid that passes through the compression solenoid valve (7) is directed to the second chamber (12), with a lower pressure than that found in the first chamber (13).

[0142] On the other hand, if the piston rod (4) expands relative to the tubes (1, 2, 3), the damping fluid from the traction chamber (10) is displaced to the first chamber (13), or intermediate chamber, through an internal upper orifice (20). Specifically, it is displaced to the upper part of the first chamber (13). The damping fluid in this part is channeled, due, for example, to the geometry of the second tube (2), to the traction solenoid valve (8), passing through another hydraulic connector (14). Depending on the configuration of the traction solenoid valve (8), a greater or lesser flow of damping fluid will be allowed, depending on the required stability and comfort, which will determine a greater or lesser displacement of the piston rod (4) relative to the tubes (1, 2, 3).The damping fluid that passes through the traction solenoid valve (8) is directed to the second chamber (12) or expansion chamber, with a lower pressure than that found in the first chamber (13).

[0143] Thus, the problem of the invention consists of how to connect the traction (8) and compression (7) solenoid valves to the second tube (2), being located in an intermediate part of the tubes (1, 2, 3), so that said solenoid valves (7, 8) can channel damping fluid between the first chamber (13) and the second chamber (12).

[0144] This problem is solved by the hydraulic connector (14) shown in Figures 1A to 1D, either separately or, as shown in Figure 2, connected to a solenoid valve. This connector (14) is the subject of the invention and is independent of the damping system comprising it. As can be seen in Figures 3A and 3B, both the traction solenoid valve (8) and the compression solenoid valve (7) are connected to one side of the first tube (1) by means of transverse guide tubes (6). In the embodiment shown, these transverse guide tubes (6) are straight, cylindrical tubes oriented transversely to the longitudinal direction of the first tube (1). The described configuration does not limit the transverse guide tubes (6) to having the same transverse direction or being located in the same longitudinal or transverse plane; they can be located anywhere along the first tube (1), even with different orientations.

[0145] Inside each of these transverse guide tubes (6) is a respective hydraulic connector (14) which is rigidly attached to its corresponding solenoid valve (7, 8), which is attached to a corresponding transverse guide tube (6) and, therefore, attached to the first tube (1).

[0146] Each of the hydraulic connectors (14) shown allows the damping fluid to be channeled between the first chamber (13) and the corresponding intermediate solenoid valve (7, 8), and at the same time allows the passage of damping fluid to be restricted or prevented between the first chamber (13) and the second chamber (12), in the connection between the hydraulic connector (14) and the second tube (2).

[0147] As can be seen in Figures 1A-1D and 2, the hydraulic connector (14) comprises a guide element (15), which is tubular, preferably cylindrical, and rigidly fixed at one end to the intermediate solenoid valve. This hydraulic connector (14) comprises an open tubular cavity, accessible by means of a first opening at one end and by means of at least one through-hole at the other end. This allows damping fluid to pass through the open tubular cavity. For connection to the intermediate solenoid valve, the guide element (15) may include a cylindrical projection that can be inserted into the interior of the intermediate solenoid valve. As shown in Figure 7, the guide element (15) is located inside the transverse guide tube (6) with a clearance between them that allows fluid to pass through this clearance.

[0148] The hydraulic connector (14) also comprises an elastic element (16) comprising a compression spring shape, located in the open tubular cavity of the guide element (15), and a connecting element (17), shaped like a ring or a cap, also located in the open tubular cavity of the guide element (15).

[0149] Said connecting element (17) comprises, in turn, a perimeter section loosely and snugly attached to the tubular cavity of the guide element (15), a first flat end base comprising a sealing area (172), located on the outside of the tubular cavity of the guide element (15); and an axial through hole, typical of ring-shaped or bushing-shaped elements.

[0150] In order for the hydraulic connector (14) to operate in the best possible way, the second tube (2) must have a flat surface (22) located in an intermediate part, which comprises an intermediate side through hole (23), also considered a flat through hole, which connects the first chamber (13) with the second chamber (12).

[0151] The operation of the hydraulic connector (14) can be interpreted from Figures 4A and 4B. As can be seen in these figures, which represent the upper section of the damping system, the elastic element (16) presses the sealing area (172) of the first flat end base of the connecting element (17) against a flat surface (22) of the second tube (2), creating a watertight seal between them. This seal blocks the passage of damping fluid between the second chamber (12) and the first chamber (13) through the intermediate lateral through-hole (23). Thus, it is the axial through-hole of the connecting element (17) that channels the damping fluid, which passes through the intermediate lateral through-hole (23) of the second tube (2), to the corresponding intermediate solenoid valve, passing through the through-hole of the guide element (15).

[0152] To prevent the damping fluid, which passes through the intermediate lateral through-hole (23) and is channeled through the axial through-hole of the connecting element (17), from escaping into the second chamber (12) without having passed through the intermediate solenoid valve, the tight fit between the perimeter section of the connecting element (17) and the tubular cavity of the guide element (15) is configured to prevent such fluid passage between the two elements.

[0153] Once the damping fluid has passed through the intermediate solenoid valve, it can be channeled through the clearance between the hydraulic connector (14) and the transverse guide tube (6) into the second chamber (12). Figure 5A shows a detail of the sealed joint created between the sealing area (172) of the first flat end base of the connecting element (17) and a flat surface (22), with this flat surface (22) having an ideal orientation and position. However, it is common for misalignments to occur during both the assembly and manufacturing of the components comprising the damping system, which require very high precision. These misalignments must be corrected to ensure proper operation.For example, in both Figure 4B and Figure 5B, the latter showing a detail of Figure 4B, it can be seen that the flat surface (22) is slightly tilted, orbited, pivoted, or inclined with respect to what would be its ideal operating position. In fact, two dashed-dotted lines have been drawn (in Figure 5B), one along the axis of the intermediate lateral through-hole (23) and the other along the axis of the axial through-hole of the guide element (15), in Figure 4B, which illustrate this tilt. This misalignment may be due to the manufacturing or assembly tolerances of the system, and the hydraulic connector (14) must be able to accommodate and reduce them.

[0154] Thanks to the described configuration, the elastic element (16) can generate sufficient pressure for the connecting element (17) to also tilt or incline, maintaining the airtight joint between the sealing area (172) of the first flat end base of the connecting element (17) and the flat surface (22), taking into account that the perimeter section of the connecting element (17) is inside the tubular cavity of the guide element (15), with a small clearance that allows the airtight fit to be maintained.

[0155] In fact, preferably, the connection between the perimeter section of the connecting element (17) and the tubular cavity of the guide element (15) is a ball-and-socket joint, so that the connecting element (17) can be tilted slightly in any direction to accommodate the misalignment of the flat face (22) of the second tube (2). This ball-and-socket joint implies that, for example, the perimeter section of the connecting element (17) has a curved surface that is either spherical or parabolic, i.e., not cylindrical, but complementary to the curved surface of the tubular cavity of the guide element (15).

[0156] Figures 6A to 6D show different embodiments of the hydraulic connector (14), which can be implemented depending on the needs.

[0157] For example, in all of these figures, the hydraulic connector (14) comprises a perimeter sealing gasket (18), elastic, press-fitted between the perimeter section of the connecting element (17) and the open tubular cavity of the guide element (15). This elastic perimeter sealing gasket (18) prevents the damping fluid that passes through the intermediate lateral through-hole (23) to the axial through-hole of the connecting element (17) from escaping at the tight joint between the connecting element (17) and the open tubular cavity of the guide element (15).

[0158] More specifically, in Figure 6A, in addition to the perimeter sealing gasket (18), two small grooves (24) can be seen located on the first flat end base of the connecting element (17). These grooves (24) completely surround the axial through-hole of the connecting element (17). These grooves (24) allow a damping fluid to be channeled between the sealing area (172) and the flat surface (22) of the second tube (2).

[0159] The function of these grooves (24) or channels located on the first flat end of the connecting element (17) is to improve the seal by creating a labyrinth seal. This forces the damping fluid to travel a long and difficult path to pass between the two surfaces, while a simpler path is available in the opposite direction. This type of seal, known as a "labyrinth," is very common in hydraulic systems. It occurs because the pressure required to force the fluid through these channels is much greater than the pressure required for it to pass through an alternative path.

[0160] Figure 6B does not show these grooves (24), but rather an alternative embodiment, which can be combined with that shown in Figure 6A, in which the connecting element (17) comprises a recess in the first flat end base, in which an axial sealing gasket (19) is located. Thus, when the sealing area (172) is pressing against the flat surface (22) of the second tube (2), the axial sealing gasket (19) is positioned between the first flat end base of the connecting element (17) and the flat surface (22) of the second tube (2), surrounding the axial through-hole of the connecting element (17). This axial sealing gasket (19) improves the seal, as it can deform, conforming to the contact surfaces, under the pressure of the elastic element (16), preventing the passage of any fluid.Figure 6C shows an embodiment similar to that shown in Figure 6A, where the perimeter sealing gasket (18) comprises a U-shaped section (although a V-shaped section would also be suitable), having two tabs, a fixed tab and a movable tab (181) configured to deform elastically due to pressure exerted by a flow of damping fluid, solely in an axial direction, between the perimeter section of the connecting element (17) and the open tubular cavity of the guide element (15). Specifically, this movable tab (181) can deform when the pressure in the second chamber (12) (expansion chamber) is much greater than the pressure in the first chamber (13) (intermediate chamber), allowing the damping fluid from the second chamber (12) to flow into the open tubular cavity of the guide element (15), bypassing the intermediate solenoid valve, and from there into the first chamber (13).In other words, it allows recirculation of the damping fluid to prevent depressions in the tension or compression chambers due to high-speed movement of the piston rod (4). Similarly, due to the arrangement of the perimeter sealing gasket (18), as shown in Figure 6C, damping fluid cannot flow in the opposite direction, since deformation of this perimeter sealing gasket (18) due to high pressure in the first chamber (13) would create a more secure seal between the contacting elements.

[0161] Finally, Figure 6D shows an embodiment that is also shown in Figures 7, 8A, and 8B. Specifically, these figures show a hydraulic connector (14) suitable for connection to an intermediate solenoid valve that is a pull solenoid valve (8). This hydraulic connector (14) comprises a flat thrust area (171), peripherally located outside the sealing area (172), situated at a first separation distance from the flat surface (22) of the second tube (2) when the sealing area (172) of the first flat end base of the connecting element (17) is in contact with the flat surface (22) of the second tube (2).

[0162] This separation distance between the thrust area (171) and the flat surface (22) comprises a channel configured to channel the damping fluid from the second chamber (12).

[0163] The operation of the hydraulic connector in this embodiment is such that, for example, when the stem (4) performs a compression movement, the tension chamber (10) increases its internal volume and significantly reduces its pressure, such that the damping fluid in the first chamber (13), which is in contact with said tension chamber (10) through the inner upper orifice (20), equalizes this pressure. In this way, the pressure in the intermediate lateral through-hole (23) as well as in the open tubular cavity of the guide element (15) of the hydraulic connector (14), which is connected to the tension solenoid valve (8), is lower than the pressure in the second chamber (12).

[0164] Since the damping fluid in the second chamber (12) surrounds the channel created in the gap between the thrust area (171) and the flat surface (22), with a pressure higher than the pressure in the open tubular cavity of the guide element (15), the connecting element (17) can be pushed in the opposite direction to that pushed by the elastic element (16). When the magnitude of this pressure exceeds the force exerted by the elastic element (16), the connecting element (17) moves in the direction normal to the thrust area, creating a passage for the exchange of damping fluid between the second chamber (12) and the first chamber (13).

[0165] This configuration allows the same type of solenoid valve to be used for both compression solenoid valves (7) and traction solenoid valves (8), since alternative systems require traction solenoid valves with a configuration that allows feedback of damping fluid from the second chamber (12).

[0166] For compression solenoid valves (7), this embodiment is not so necessary because the feedback between the second chamber (12) and the first chamber (13) can be carried out by means of the valve support (9).

Claims

AMENDED CLAIMS received by the International Bureau on May 13, 2026 (13.05.2026) 1. Hydraulic connector (14), configured to hydraulically connect an intermediate solenoid valve (7, 8) to a side of a second tube (2) of a damping system; wherein the second tube (2) is located inside a first tube (1), both tubes (2, 1) being straight and oriented in a longitudinal direction, wherein the intermediate solenoid valve (7, 8) is located on an outer side of the first tube (1); wherein the damping system comprises a first chamber (13) inside the second tube (2), and a second chamber (12) between the second tube (2) and the first tube (1); wherein the solenoid valve (7, 8) is configured to regulate the flow of a fluid, preferably a damping fluid, between the first chamber (13) and the second chamber (12);wherein the hydraulic connector (14) is characterized in that it is configured to channel fluid between the first chamber (13), through an intermediate lateral through-hole (23) of the second tube (2), and the solenoid valve (7, 8); and wherein the hydraulic connector (14) is configured to connect to a perimeter of the intermediate lateral through-hole (23) of the second tube (2) by means of a watertight joint configured to prevent the direct passage of fluid between the first chamber (13) and the second chamber (12), through said intermediate lateral through-hole (23); and wherein the hydraulic connector (14) comprises:; - a guide element (15), comprising a tubular shape, configured to be rigidly fixed, at a second end, to the solenoid valve (7, 8), wherein said guide element (15) comprises an open tubular cavity, by means of a first opening located at a first end, and by means of at least one through hole, at the second end; - an elastic element (16); - a connecting element (17), annular in shape, comprising: either a peripheral section tightly fitted to the tubular cavity of the guide element (15); or a first flat end base comprising a sealing area (172) located on the outside of the tubular cavity of the guide element (15); or an axial through-hole; wherein the elastic element (16) is configured to press the sealing area (172) of the first flat end base of the connecting element (17) against a flat surface (22) of the second tube (2), in which the intermediate lateral through-hole (23) of the second tube (2) is located, creating a watertight joint between them; and wherein the hole The axial through-hole of the connecting element (17) is configured to channel fluid between the first chamber (13), which passes through the intermediate side through-hole (23) of the second tube (2), and the solenoid valve (7, 8); and wherein the tight fit between the perimeter section of the connecting element (17) and the tubular cavity of the guide element (15) is configured to restrict the passage of fluid between said fit.

2. Hydraulic connector (14), according to claim 1, configured to be located inside a transverse guide tube (6) of the damping system, with a clearance with respect to an inner surface of said transverse guide tube (6), which is rigidly attached, at a first end, to an outer side of the first tube (1) and, at a second end, the solenoid valve (7, 8) is fixed.

3. Hydraulic connector (14), according to any of the preceding claims, wherein the tight joint between the perimeter section of the connecting element (17) with the tubular cavity of the guide element (15) is a ball-joint articulated connection.

4. Hydraulic connector (14), according to any of the preceding claims, wherein the elastic element (16) is an element selected from the group comprising: a helical spring, a compression spring, a wave spring and an elastomeric element.

5. Hydraulic connector (14), according to any of the preceding claims, wherein the sealing area (172) of the first flat end base of the connecting element (17) comprises at least one open groove (24) that surrounds, totally or partially, the axial through-hole of the connecting element (17), wherein said groove (24) is configured to channel a liquid between said sealing area (172) and the flat surface (22) of the second tube (2), when said sealing area (172) is pressing the flat surface (22) generating the watertight joint.

6. Hydraulic connector (14), according to any of the preceding claims, wherein the hydraulic connector (14) comprises an axial sealing gasket (19) located on the first flat end base of the connecting element (17), surrounding the axial through hole of the connecting element (17).

7. Hydraulic connector (14), according to any of the preceding claims, where The hydraulic connector (14) comprises a perimeter sealing gasket (18), tightened between the perimeter section of the connecting element (17) and the open tubular cavity of the guide element (15).

8. Hydraulic connector (14), according to the preceding claim, wherein the perimeter sealing gasket (18) comprises a U-shaped section, comprising a movable flange (181) configured to deform elastically due to pressure exerted by a fluid flow passage, only in an axial direction, between the perimeter section of the connecting element (17) and the open tubular cavity of the guide element (15).

9. Hydraulic connector (14), according to any of the preceding claims, wherein the first flat end base of the connecting element (17) comprises a thrust area (171), peripherally outside the sealing area (172), located at a first separation distance from the sealing area (172) in a direction normal to said sealing area; wherein the sealing area (172) being in contact with the flat surface (22) of the second tube (2), the thrust area (171) is located at a separation distance from the flat surface (22) comprising a channel configured to channel fluid; and wherein the connecting element (17) is configured to move, with respect to the guide element (15), in the direction normal to the thrust area (171), in a compressive direction, when a pressure is applied to the thrust area (171) greater than the pressure exerted on said connecting element (17) in the opposite direction.

10. A damping system comprising the hydraulic connector (14) of any of the preceding claims, and wherein the damping system also comprises: - the first tube (1) which is an outer tube of the shock absorber system; - a third tube (3) which is an inner tube of the shock absorber system; - the second tube (2) which is an intermediate tube of the damping system, located between the outer tube and the inner tube; - a stem (4) configured to move in a straight longitudinal direction relative to the outer tube; - a piston (5) attached to a first end part of the rod (4), movable in the longitudinal direction, through an interior of the third tube (3), between a first end and a second end of said third tube (3); - a traction chamber (10) located inside the third tube (3) between the piston (5) and the first end of the third tube (3); - a compression chamber (11) located inside the third tube (3), between the piston (5) and the second end of the third tube (3); - the second chamber (12) which is an expansion chamber located between the outer tube (1) and the second tube (2); - the first chamber (13) which is an intermediate chamber located between the second tube (2) and the third tube (3); - the damping fluid, configured to flow between the chambers (10, 11, 12, 13) of the damping system; and - at least one intermediate solenoid valve (7, 8) that is a compression solenoid valve (7) or a pull solenoid valve (8), configured to limit the longitudinal displacement of the stem (4), in the compression and expansion directions, respectively; wherein the third tube (3), the first tube (1), and the second tube (2) are straight, oriented in a longitudinal direction, rigidly connected to each other, and preferably arranged concentrically; and wherein the solenoid valve (7, 8) is attached to a portion of the first tube (1), in an intermediate part located between two ends of said first tube (1), and is configured to control a flow of damping fluid between the first chamber (13) and the second chamber (12); wherein the hydraulic connector (14) is configured to: - channel damping fluid between the first chamber (13) and the solenoid valve (7, 8); and - to regulate or restrict a passage of damping fluid between the second chamber (12) and the first chamber (13) in the connection between the hydraulic connector (14) and the second tube (2).

11. Damping system, according to the previous claim, wherein the second tube (2) comprises the flat surface (22), in an intermediate part, comprising the intermediate lateral through hole (23) that connects the first chamber (13) with the second chamber (12).

12. Damping system, according to any of claims 10 to 11, comprising the hydraulic connector (14) according to claim 9, wherein the solenoid valve (7, 8) is a traction solenoid valve (8) and where, the sealing area (172) of the connecting element (17) being in contact against the flat surface (22) of the intermediate tube (2), the connecting element (17) is configured to move in a direction normal to said sealing area (172), with respect to the guide element (15), separating the sealing area (172) with respect to the flat surface (22) of the second tube (2), generating a damping fluid exchange passage between the second chamber (12) and the first chamber (13), when the damping fluid of the second chamber (12) exerts a pressure on the thrust area (171) greater than the pressure exerted by the elastic element (16) and the damping fluid, in the opposite direction, on the connecting element (17).

13. Damping system, according to any of claims 10 to 12, comprising the hydraulic connector (14) according to claim 2, wherein the damping system comprises at least one transverse guide tube (6) rigidly fixed to the first tube (1), preferably oriented in a direction transverse to the longitudinal direction of the first tube (1); wherein the hydraulic connector (14) is located inside said transverse guide tube (6), with sufficient clearance to channel a damping fluid flow between the solenoid valve (7, 8) and the second chamber (12).

14. Damping system, according to any of claims 10 to 13, comprising two intermediate solenoid valves (7, 8), a first intermediate solenoid valve being the traction solenoid valve (8) and a second intermediate solenoid valve being the compression solenoid valve (7), wherein each of said intermediate solenoid valves (7, 8) is attached to a different zone of the same or different intermediate parts of the first tube (1) and is configured to regulate a different damping fluid flow rate between the first chamber (13) and the second chamber (12).

15. Damping system, according to claim 11, wherein the second tube (2) comprises two flat surfaces (22), in different intermediate parts of said second tube (2), each comprising an intermediate lateral through hole (23) that connects the first chamber (13) with the second chamber (12); and wherein the damping system comprises two hydraulic connectors (14), each of them connected to one of the two solenoid valves (7, 8).

16. Damping system, according to any of claims 10 to 15, wherein the third tube (3) comprises at least one inner upper hole (20) that communicates damping fluid between the traction chamber (10) and the first chamber (13) and at least one inner lower hole (21) that communicates damping fluid between the compression chamber (11) and the first chamber (13).

17. Damping system, according to any of claims 10 to 16, comprising a valve support (9) connected to a lower end portion of the first tube (1). [0001] [0002]DECLARATION UNDER ARTICLE 19.1 PCT [0003]Claim 1 has been amended; claim 3 has been amended; claims 4 to 18 have been renumbered. [0004]• Claims 1 and 3 currently in the file have been combined into a new amended claim 1. [0005]• Dependent claims 4 to 10 currently in the file have been renumbered as claims 3 to 9, and their dependencies have been updated accordingly to refer to "any of the preceding claims" or the specific renumbered claim, as appropriate. [0006]• Independent claim 1 (damping system) currently in the file has been renumbered as claim 10, and its reference to the hydraulic connector has been updated to read "the hydraulic connector (14) of any of the preceding claims (1 to 9)", so that it expressly incorporates the amended independent claim 1 and all of its dependent claims. [0007]• The original claim 12 in the dossier has now been renumbered as claim 11, with its dependency updated to refer to claim 10. [0008]• Claims 13 to 18 currently in the file have been renumbered as claims 12 to 17, and their dependencies have been updated accordingly. In particular, the reference in renumbered claim 12 (original claim 13) to the hydraulic connector has been corrected to refer to claim 9 (original claim 10), which contains the thrust area feature (171).

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