GB2615609A

GB2615609A - One-way valve, reservoir assembly comprising one-way valve and brake system

Info

Publication number: GB2615609A
Application number: GB2202024.2A
Authority: GB
Inventors: Loghin Constantin; Costas Andrei-Nicolaie; Petrica Cazacu Constantin; Baciu Mihai
Original assignee: Continental Automotive Technologies GmbH
Current assignee: Continental Automotive Technologies GmbH
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2023-08-16
Also published as: GB202202024D0

Abstract

A valve for a brake fluid reservoir including a rigid rod 1; a flexible sealing 2 fastened on the rod by a push lock nut 3; a guide flange 4; a spring 5 and a disc 6 clipped onto the rod. The guide flange 4 is to be press-fit inside a reservoir port and the rod slidingly located inside it. The spring 5 is held between the disc 6 and the guide flange 4. The rod has three rod sections 1.1, 1.2, 1.3 with progressively smaller diameters, and a tapered fourth section 1.4 with a slit 1s. To assemble, the valve is pushed into the reservoir port from the outside (see figure 3) such that the flexible sealing 2 is located inside the reservoir chamber and the valve is normally closed by the force of the spring 5 holding the sealing 2 against the inside of the port. In use, when a force is applied to the end of rod 1.4, for example by connecting the reservoir to a valve support, the spring 5 is compressed and a space opens up between the sealing 2 and the reservoir port allowing brake fluid flow from the reservoir.

Description

One-way valve, reservoir assembly comprising one-way valve and brake system

Field of the invention

This invention generally relates to brake fluid reservoirs for brake systems.

More particularly, this invention relates to a one-way valve for a brake fluid reservoir port including one-way valve assembly, a reservoir assembly comprising one-way valve and a brake system.

Background of the invention

The brake system is supplied with a brake fluid from a brake fluid reservoir placed on the top of the brake system unit, a reservoir port ensuring a continuous flow of the brake fluid to the braking lines, as shown in Fig. la.

The known one-way valves and the corresponding reservoir assemblies comprising same, for example the one-way valve type shown in Fig. 1 b, have complicated design, are difficult to be mounted in the reservoir port, involving many complex inter-relating parts which are moving in respect to each other leading to a variety of operational issues in maintaining control of flow, and pressures in the brake systems.

In addition, the known one-way valves do not provide a leakage safety, in particular the brake fluid freely flows from the brake fluid reservoir, the brake fluid being lost when disassembling the brake fluid reservoir or in the event of an accident causing the brake fluid reservoir to snap off the brake system unit.

Problem to be solved by the invention The technical problem to be solved by the invention is preventing the loss of the brake fluid during replacement of the brake fluid reservoir or in case of an accident when the brake fluid reservoir snaps off the brake system unit.

Summary of the invention

In one aspect of the invention it is provided a one-way valve for a brake fluid reservoir of a brake system, the brake system reservoir comprising a reservoir chamber and a reservoir port, the reservoir port having two parts: a first reservoir port part with an outward diameter and a second reservoir port part adjacent to the reservoir chamber having an inward diameter, said outward diameter being greater than the inward diameter with a value placed in a first predetermined interval, said one-way valve comprising: - a rigid rod comprising: * three consecutive rod segments with progressively smaller diameters a first end rod segment having a first rod diameter dimensioned in respect to the inward diameter such that the first end rod segment to be slidable within the second reservoir port part, a second rod segment having a second rod diameter a third rod segment having a third rod diameter and * a fourth end rod segment comprising a tapered head, said fourth end rod segment having a fourth rod diameter, said rigid rod comprising a rod slit centrally extending along the fourth end rod segment and along a part of third rod segment, said rod slit having a slit thickness; wherein the fourth rod diameter is greater than the third rod diameter with a 15 value in a second predetermined interval between a minimum of 0.5 mm and maximum equal with the slit thickness; - a flexible sealing having a flexible sealing thickness and a central through hole with an internal diameter configured to receive the second rod segment, said flexible sealing being fastened against the first end rod segment by means 20 of a push lock nut clamped on the second rod segment and pressed on the flexible sealing; wherein the push lock nut has an external diameter smaller than the first rod diameter with a value equal to twice of the flexible sealing thickness, and the flexible sealing has an external diameter greater than the inward diameter of the reservoir port with a value within a third predetermined interval; - a guide flange slidingly mounted on the third rod segment having an internal diameter dimensioned in respect to the third rod diameter such that to allow sliding of the guide flange on the third rod segment and an external diameter dimensioned in respect to the outward diameter such that to be pressed-fit inside the reservoir port, said guide flange being configured to allow the brake fluid to pass through said guide flange; - a disc clipped on the third rod segment, said disc having an internal disc diameter smaller than the fourth rod diameter, and dimensioned in respect to the third rod diameter such that to be pressed-fit on the third rod segment; - a spring slidingly mounted on the third rod segment between the guide flange and the disc, said spring having an elastic force being configured to ensure when the one-way valve is mounted within the brake reservoir port: *a brake fluid flow from the reservoir when said spring is in a compressed state due to a compression force applied on the fourth end segment or on the disc; * no fluid flow from the reservoir when said spring is not compressed due to the said compression force, wherein the one-way valve has a normal closed position when the spring is not compressed by said compression force and an open position when the spring is compressed by said compression force.

In a second aspect of the invention it is provided a reservoir assembly of a brake system comprising a reservoir chamber and a one-way valve according to the first aspect; the reservoir chamber comprising a reservoir port; the reservoir port having two parts, namely a first reservoir port part with an outward diameter and a second reservoir port part, the second reservoir port part adjacent to the reservoir chamber, having an inward diameter, wherein the outward diameter is greater than the inward diameter.

In a third aspect of the invention it is provided a brake system comprising the reservoir assembly according to the second aspect of the invention.

Advantages The one-way valve according to present invention has the advantage that is easily mounted within the reservoir assembly because it is mounted from the exterior of the reservoir port, as compared with the known one-way valves are mounted through the inner part of the brake fluid reservoir.

The one-way valve and the reservoir assembly comprising the one-way valve provide improved tightness of the brake fluid system, eliminating leakages when removing the brake fluid reservoir by stopping the brake fluid to flow when the brake fluid reservoir is removed due to the switch from the open position to the normal closed position of the one-way valve.

Further features and advantages of the invention stems from the following description and the claims with reference to the accompanying drawings in which like reference characters designate the same component throughout the figures.

List of drawings Further special features and advantages of the present invention can be taken from the following description of an advantageous embodiment by way of the accompanying drawings: Fig. la General architecture of a brake system;

Fig. lb One-way valve according to prior art;

Fig. 2 One-way valve according to invention with main component parts -perspective view; Fig. 3 One-way valve according to invention to be mounted in the reservoir port -perspective view; Fig. 4 Detailed view of the one-way valve according to the invention with the rigid rod during mounting of guide flange, spring and disc -cross-section; Fig. 5 One-way valve according to invention mounted in the reservoir port, in perspective view, with the component parts and references; Fig. 6 One-way valve according to invention mounted in the reservoir port -perspective view; Fig. 7a One-way valve according to invention mounted in the reservoir port, in closed state -cross-section; Fig. 7b One-way valve according to invention mounted in the reservoir port, in open state -cross-section; Fig. 8 One-way valve according to the invention, with the three compression states of the spring: Fig. 8a One-way valve not assembled within the reservoir port; Fig. 8b One-way valve assembled within the reservoir port, but the assembly not mounted in the brake system, when no compression force is applied; Fig. 8c One-way valve assembled within the reservoir port, with the assembly mounted in the brake system, when a compression force is applied; Fig. 9a Preferred embodiment of one-way valve according to the invention, not assembled; Fig. 9b Preferred embodiment of one-way valve according to the invention, assembled in the reservoir port.

Detailed description

The one-way valve of the invention, as seen in Fig. 5 is a component adapted for a brake fluid reservoir of a brake system. The brake fluid reservoir comprises a reservoir chamber and an adapted reservoir port having two parts: - a first reservoir port part placed outwardly, opposite in respect to the reservoir chamber, said first reservoir port part having an outward diameter drpo and - a second reservoir port part adjacent to the reservoir chamber, said second reservoir port part having an inward diameter dmi.

The outward diameter dry, is greater than the inward diameter do, with a value within a first predetermined interval.

The one-way valve comprises: a rigid rod 1 that is arranged to be mounted inside the reservoir port, a flexible sealing 2, arranged to be fastened on the rigid rod 1 by means of a push lock nut 3, a guide flange 4, arranged to be slidingly mounted on the rigid rod 1, a spring 5 arranged to be slidingly mounted on the rigid rod 1, a disc 6, arranged to be clipped on the rigid rod 1.

Said rigid rod 1 comprises three consecutive rod segments with progressively smaller diameters and a fourth rod segment, the fourth rod segment comprising a tapered head with a larger diameter than the adjacent segment, as follows: The first end rod segment 1.1 is configured to be mounted inside the reservoir port, being the first among the four rod segments to be mounted inside the reservoir port. The first end rod segment 1.1 has a diameter di.i substantially larger than the diameters of the other rod segments of the rigid rod 1. The diameter di.i is configured in respect to the inward diameter dipi such that the first end rod segment 1.1 be slidable within the second reservoir port part.

The second rod segment 1.2 has a diameter di 2, allowing the sliding fit of the sealing.

The third rod segment 1.3 has a diameter di.3, the diameter di.3 being the smallest diameter of the rigid rod 1. On the third rod segment 1.3 is slidably mounted the guide flange 4 that fixes the valve inside the reservoir port.

The fourth end rod segment 1.4 has a diameter di.4. The fourth end rod segment 1.4 comprises a tapered head and a rod slit 1s centrally extending along the fourth end rod segment 1.4 and continuing along a part of third rod segment 1.3. The rod slit 1s has a slit thickness t. The diameter di.4 is greater than the diameter di.3 with a value that stands in a second predetermined interval between a minimum of 0.5 mm and maximum equal with the slit thickness t, in order to allow the mounting in this order of the guide flange 4, the spring 5 and the disc 6, as depicted in Fig. 4.

The diameters di.i, di.2, di.3, di.4 of the rigid rod 1 are dimensioned depending on the particulars of the one-way valve and of the reservoir port, considering that the rigid rod 1 is pressed against the valve support in order to ensure the open state of the one-way valve and correspondingly the brake fluid, when said one-way valve is assembled in the reservoir port.

The flexible sealing 2 has a thickness t2. The flexible sealing 2 comprises a central through hole having an internal diameter d21, configured to receive the second rod segment 1.2. The internal diameter dzi of the flexible sealing 2 is dimensioned such to allow the sliding mounting of the flexible sealing 2 onto the second rod segment 1.2. The flexible sealing 2 has an external diameter the greater than the inward diameter do of the reservoir port with a value within a third predetermined interval, in order to seal the brake reservoir when the one-way valve is assembled in the reservoir port but the brake fluid reservoir is not mounted in the brake system. The push lock nut 3 is clamped on the second rod segment 1.2, said push lock nut 3 being pressed on the flexible sealing 2. The push lock nut 3 fastens the flexible sealing 2 against the first end rod segment 1.1, due to the substantially larger diameter di., compared to the diameter di.2 of the respective rod segments. The push lock nut 3 has an external diameter d3e smaller than the first rod diameter di.i with a value that is equal to twice of the thickness t2 of the flexible sealing 2.

The guide flange 4 is the component part that fixes the one-way valve inside the reservoir port of the brake fluid reservoir. The guide flange 4 has an internal diameter dai and an external diameter the. The internal diameter dai enables the guide flange 4 to slide on the third rod segment 1.3. The external diameter dae is dimensioned such that to enable the guide flange 4 to be pressed-fit inside the reservoir port on the first reservoir port part having the first outward diameter drpo, fastening said guide flange 4 against the second reservoir port part due to the fact that the second inward diameter do is smaller than the first outward diameter dmo. The guide flange 4 is configured for allowing the brake fluid to pass through said guide flange 4.

The disc 6 is clipped on the third rod segment 1.3, in the vicinity of the fourth 1 0 end rod segment 1.4. Said disc 6 has an internal disc diameter -not represented graphically, that is smaller than the fourth rod diameter di.4, and dimensioned in respect to the third rod diameter di.3 such that to be pressed-fit on the third rod segment 1.3.

The disc 6 has a diameter di.4 that is greater than the diameter di.3 with a value at most equal to slit thickness t. The disc 6 is configured for allowing the brake fluid to pass through it.

The spring 5 is slidingly mounted on the third rod segment 1.3 between the guide flange 4 and the disc 6, the disc 6 locking the spring 5 in order to prevent said spring 5 to pass off the rigid rod 1.

The disc 6 is clipped on the third rod segment 1.3 to secure the spring 5 and to limit its position against the fourth end rod segment 1.4.

The tapered head of the fourth end rod segment 1.4 and to the central slit extending along the fourth end rod segment 1.4 and continuing along a portion of the third rod segment 1.3 allow mounting of the guide flange 4, of the spring 5 and of the disc 6.

Said spring 5 is characterized by an elastic force configured to ensure when the one-way valve is mounted within the brake reservoir port: * a brake fluid flow from the brake fluid reservoir when said spring 5 is in a compressed state due to a compression force applied on the fourth end segment 1.4. or on the disc 6; * no fluid flow from the brake fluid reservoir when said spring 5 is not compressed due to the said compression force, The one-way valve has a normal closed position when the spring 5 is not compressed by said compression force and an open position when the spring 5 is compressed by said compression force. The switch between the open position and the normal closed position is ensured by the elastic force of said spring 5 that automatically changes from the open position to the normal closed position in the absence of said compression force, and by this eliminating the leakages of the brake fluid.

The elastic force of the spring 5 is able to keep on fixed position the guide flange 4 and the disc 6 when the one-way valve is not mounted and determines the open or closed state of the mounted one-way valve, allowing the brake fluid to flow from the brake fluid reservoir when said spring 5 is compressed and sealing the brake fluid reservoir when said spring 5 is released.

The one-way valve according to the invention, as depicted in the Fig. 2 is assembled in the reservoir port, as seen in Fig. 3 before assemblage and in Fig. 5.

Fig. 6, Fig. 7a and Fig. 7b after assemblage.

The one-way valve assembled in the reservoir port, but the reservoir assembly containing said one-way valve is not placed in the brake system has a normal closed position maintained by the component parts, as seen in Fig. 6 and Fig. 7a, particularly by the spring 5, the guide flange 4, the flexible sealing 2, and the rigid rod 1, the rigid rod 1 extending out of the reservoir port.

When the one-way valve is assembled in the reservoir port and the reservoir assembly containing said one-way valve is placed in the brake system, pressed against the valve support, the mechanical action of the valve support presses the rigid rod 1, ensuring an open position in a mounted state, as seen in Fig. 7b.

In order to use the one-way valve according to the invention, a special adaptation of the reservoir port is necessary, said reservoir port having two parts with different diameters: the first reservoir port part, outwardly, opposite in respect to the reservoir chamber, having the first outward diameter drp0 and the second reservoir port part, inwardly, adjacent to the reservoir chamber, the second reservoir port part having the second inward diameter drpi, wherein drpo is larger than drpi, as seen in Fig. 5, 7a and 7b. The smaller diameter drpi on the inward part of the reservoir port allows the fit mounting of the one-way valve within the reservoir port, particularly preventing the one-way valve to get into the reservoir port. The guide flange 4 is fastened on the first reservoir port part with larger diameter drpo, nearby the second reservoir port part with smaller diameter drpi, due to the diameter reduction The material of the rigid rod 1 is chosen in order to carry out its functions, as above mentioned, namely to resist to all tensions acting on the rigid rod 1. Said rigid rod 1 is made of plastic.

The material of the flexible sealing 2 is chosen in order to carry out its functions, as above mentioned, namely to be able to correspondingly flatten and to extend and to seal the reservoir port from the brake fluid reservoir. Said flexible sealing 2 is made of rubber.

The material of the guide flange 4 is plastic.

The material of the spring 5 is alloy steel.

The material of the disc 6 is plastic.

The method of mounting the one-way valve according to the invention within the reservoir port for the reservoir assembly needs to carry out the following steps: Firstly, the one-way valve according to the invention is positioned in front of the reservoir port with the first end rod segment 1.1 towards the brake fluid reservoir, in alignment with the longitudinal axis of the reservoir port, as seen in Fig. 3. The flexibility of the flexible sealing 2 determines its flattening, enough to force said flexible sealing 2 to fit in the space between the external diameter d3e of the push lock nut 3 and the inward diameter dm; of the reservoir port, traveling along the first reservoir port part. By increasing the force applied, the flexible sealing 2 is more flattened, it fitting in the next smaller space between the external diameter d30 and the inward diameter drpi, traveling along the second port part. The push lock nut 3 maintains the position of the flexible sealing 2 on the second rigid rod segment 1.2, against the first end rod segment 1.1, while said flexible sealing 2 passes through the reservoir port. When reaching the reservoir chamber, the larger space determines the flexible sealing 2 to extend, as seen in Fig. 5, Fig. 7a and Fig. 7b.

The reservoir assembly containing the one-way valve according to invention, mounted in the brake system, allows the brake fluid to flow. Said reservoir assembly will stop the brake fluid flow only in the case it is removed, for replacement operation or in case of an accident with the reservoir assembly snapped off the brake system unit.

The one-way valve has a first, free position, when it is not assembled in the reservoir port, with the spring 5 having a minimum compression ensuring the fixation of the guide flange 4 and the disc 6, as seen in Fig. 8a.

The second is the closed position of the one-way valve, when it is preassembled in the reservoir port but the brake fluid reservoir is not mounted in the brake system. The spring 5 has a compression given only by the guide flange 4 mounted pressed-fit inside the reservoir port, as seen in Fig. Sc. The spring 5 maintains the one-way valve in closed position as seen in Fig. 7a.

The third is the open position of the one-way valve, when the brake fluid reservoir is mounted, the spring 6 having a maximum, very high compression as seen in Fig. 8b, through mechanical action of the valves support that spaces the flexible sealing 2 from the inside wall surface of the reservoir port with a distance D, as represented in Fig. 7 b.

The difference between the external diameter d2e of the flexible sealing 2 and the inward diameter drpi of the reservoir port is a value within the third predetermined interval, determining the sealing of the brake fluid reservoir against the reservoir port on the resulting 0-ring surface between two concentric circles of diameters d2e and drpi, when the one-way valve is preassem bled in the reservoir port, but said brake fluid reservoir is not mounted in the brake system.

Example of realization With reference with the Fig. 9a and Fig. 9b, a particular embodiment of the present invention is presented, wherein the one way valve for a brake fluid reservoir of a brake system comprises three consecutive segments with progressively smaller diameters, the first end rod segment 1.1 of 7,6 mm, the second rod segment 1.2 of 6 mm, and the third rod segment 1.3 of 2,5 mm. In particular, the first end rod segment 1.1, which has a thickness of a 1 mm, and a first rod diameter cli.i in amount of 7,6 mm which is dimensioned in respect to the inward diameter drpi of 7,9 mm, such that first end rod segment 1.1 to be slidable mounted within the second reservoir port part. The second rod segment 1.2 has a length of 7 mm, and a second rod diameter di.2 of 3 mm, and the third rod segment 1.3 which has a length of 12,5 mm, and a third rod diameter di.3 of 2,5 mm. The rigid rod 1 further comprises the fourth end rod segment 1.4 of 2mm length which has a tapered head to allow easily mounting of the flexible sealing 2, spring 5 and disc 6, as it is presented in Fig. 4. The fourth end rod segment 1.4 has a fourth rod diameter d14 of 3 mm, being greater than the third rod diameter di.3 with 0.5 mm. The rod slit 1s centrally extends along the fourth end rod segment 1.4, and along a part of third rod segment 1.3, and has a slit thickness t of a value of 0,8 mm in order to allow arrangement of the disc 6 which has an inner diameter smaller with than the fourth rod diameter di.4 of 3 mm.

The flexible sealing 2 has a flexible sealing thickness t2 of 0,8mm and the central through hole with the internal diameter d21 configured to receive the second rod segment 1.2 of 3 mm. Said flexible sealing 2 is fastened against the first end rod segment 1.1 by means of the push lock nut 3 clamped on the second rod segment 1.2 and pressed on the flexible sealing 2. The push lock nut 3 has an external diameter d3e of 6 mm, smaller than the first rod diameter di.i with a value equal to twice of the flexible sealing thickness t2, while the flexible sealing 2 has the external diameter d2e of 10 mm greater than the inward diameter do of 7,9mm of the reservoir port. The guide flange 4 has the internal diameter da; dimensioned in respect to the third rod diameter dr.3 of 2,5mm such that to be sliding mounted on the third rod segment 1.3.

The external diameter dire of the guide flange 4 is dimensioned in respect to the outward diameter drpo of 8,5 mm such that to be pressed-fit inside the reservoir port and larger than drip of 7,9 mm so that to be fastened against first reservoir port part. The disc 6 is clipped on the third rod segment 1.3, said disc 6 has the internal disc diameter smaller than the fourth rod diameter di.4, and dimensioned in respect to the third rod diameter di.3 such that to be pressed-fit on the third rod segment 1.3. The spring 5 is mounted between the guide flange 4 and the disc 6. The elastic force is configured to ensure the brake fluid flow from the brake fluid reservoir when it is compressed by means of the compression force applied on the fourth end segment 1.4 or on the disc 6, and no fluid flow from the brake fluid reservoir when no compression force is applied.

In a second aspect of the invention, it is provided a reservoir assembly of a brake system comprising the reservoir chamber and the one-way valve according to the first aspect of the invention. The reservoir chamber comprises a reservoir port.

The reservoir port has two parts: namely a first reservoir port part with an outward diameter drpo and a second reservoir port part, the second reservoir port part adjacent to the reservoir chamber, having an inward diameter do, wherein the outward diameter drpo is greater than inward diameter drpi.

In a third aspect of the invention, it is provided a brake system comprising the reservoir assembly of the second aspect of the invention.

While certain embodiments of the present invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention as defined by the following claims.

REFERENCE SIGNS

1 rigid rod 1.1 first end rod segment di.i first diameter of the first end rod segment 1.2 second rod segment cli.2 second diameter of the second end rod segment 1.3 third rod segment di.3 third diameter of the third end rod segment 1.4 fourth end rod segment cli.4 fourth diameter of the fourth end rod segment 1s rod slit thickness of the rod slit 2 flexible sealing c121 internal diameter of the flexible sealing the external diameter of the flexible sealing t2 flexible sealing thickness 3 push lock nut 4 guide flange c141 internal diameter of the guide flange d4e external diameter of the guide flange spring 6 disc drpo outward diameter of the reservoir port drpi inward diameter of the reservoir port

Claims

CLAIMS1. One-way valve for a brake fluid reservoir of a brake system, the brake system reservoir comprising a reservoir chamber and a reservoir port, the reservoir port having two parts: a first reservoir port part with an outward diameter (drpo) and a second reservoir port part adjacent to the reservoir chamber having an inward diameter (drpi), said outward diameter (drpo) being greater than the inward diameter (drpi) with a value within a first predetermined interval, said one-way valve comprising: - a rigid rod (1) comprising: * three consecutive rod segments with progressively smaller diameters: * a first end rod segment (1.1) having a first rod diameter (chi) dimensioned in respect to the inward diameter (do) such that the first end rod segment (1.1) to be slidable within the second reservoir port part; * a second rod segment (1.2) having a second rod diameter (Ch.2); * a third rod segment (1.3) having a third rod diameter (d1.3) and * a fourth end rod segment (1.4) comprising a tapered head, said fourth end rod segment having a fourth rod diameter (dr.4), said rigid rod (1) comprising a rod slit (1s) centrally extending along the fourth end rod segment (1.4) and along a part of third rod segment (1.3), said rod slit (1s) having a slit thickness (t); wherein the fourth rod diameter (1.4) is greater than the third rod diameter (c11.3) with a value in a second predetermined interval between a minimum of 0.5 mm and maximum equal with the slit thickness (t); - a flexible sealing (2) having a flexible sealing thickness (t2) and a central through hole with an internal diameter (d21) configured to receive the second rod segment (1.2), said flexible sealing (2) being fastened against the first end rod segment (1.1) by means of a push lock nut (3) clamped on the second rod segment (1.2) and pressed on the flexible sealing (2), wherein * the push lock nut (3) has an external diameter (d3e) smaller than the first rod diameter (di.i) with a value equal to twice of the flexible sealing thickness (t2), and * the flexible sealing (2) has an external diameter (the) greater than the inward diameter (drpi) of the reservoir port with a value within a third predetermined interval; - a guide flange (4) slidingly mounted on the third rod segment (1.3) having * an internal diameter (din) dimensioned in respect to the third rod diameter (d1.3) such that to allow sliding of the guide flange (4) on the third rod segment (1.3); * and an external diameter (ciao) dimensioned in respect to the outward diameter (drpo) such that to be pressed-fit inside the reservoir port; said guide flange (4) being configured to allow the brake fluid to pass through said guide flange (4); - a disc (6) clipped on the third rod segment (1.3), said disc (6) having an internal disc diameter smaller than the fourth rod diameter (dr.4), and dimensioned in respect to the third rod diameter (d1.3) such that to be pressed-fit on the third rod segment (1.3); -a spring (5) slidingly mounted on the third rod segment (1.3) between the guide flange (4) and the disc (6), said spring (5) having an elastic force being configured to ensure when the one-way valve is mounted within the brake reservoir port: * a brake fluid flow from the reservoir when said spring (5) is in a compressed state due to a compression force applied on the fourth end segment (1.4.) or on the disc (6); * no fluid flow from the reservoir when said spring (5) is not compressed due to the said compression force, wherein the one-way valve has a normal closed position when the spring (5) is not compressed by said compression force and an open position when the spring (5) is compressed by said compression force.
2. One-way valve according claim 1 wherein the external diameter (the) of the flexible sealing (2) is greater than the inward diameter (drpi) with a value within the third predetermined interval between 0,5 mm and 10 mm, preferable between 1 mm and 5 mm, more preferable 2,1 mm.
3. One-way valve according claim 1 or 2 wherein the material of the rigid rod (1) is plastic.
4. One-way valve according to any preceding claim, wherein the material of the flexible sealing (2) is rubber.
5. One-way valve according to any preceding claim, wherein the material of the guide flange (4) is plastic.
6. One-way valve according to any preceding claim, wherein the material of the spring (5) is spring steel.
7. One-way valve according to any preceding claim wherein the material of the disc (6) is plastic. 15
8. Reservoir assembly of a brake system comprising a reservoir chamber and a one-way valve according to any preceding claim, the reservoir chamber comprising a reservoir port, the reservoir port having two parts namely a first reservoir port part with an outward diameter (drpo) and a second reservoir port part adjacent to the reservoir chamber having an inward diameter (do), wherein the outward diameter (drpo) is greater than the inward diameter (drpi) with a value within the first predetermined interval.
9. Brake system characterized in that it comprises the reservoir assembly according to claim 8.