GB2567834A - Comfort damper - Google Patents

Comfort damper Download PDF

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Publication number
GB2567834A
GB2567834A GB1717528.2A GB201717528A GB2567834A GB 2567834 A GB2567834 A GB 2567834A GB 201717528 A GB201717528 A GB 201717528A GB 2567834 A GB2567834 A GB 2567834A
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GB
United Kingdom
Prior art keywords
comfort damper
comfort
damper
damping
outer diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1717528.2A
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GB2567834B (en
GB201717528D0 (en
Inventor
Boby Toghe Ion
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Continental Automotive Systems SRL
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Continental Automotive Systems SRL
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Publication date
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Priority to GB1717528.2A priority Critical patent/GB2567834B/en
Publication of GB201717528D0 publication Critical patent/GB201717528D0/en
Publication of GB2567834A publication Critical patent/GB2567834A/en
Application granted granted Critical
Publication of GB2567834B publication Critical patent/GB2567834B/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
    • B60T8/368—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units combined with other mechanical components, e.g. pump units, master cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/50—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition having means for controlling the rate at which pressure is reapplied to or released from the brake
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4068—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system the additional fluid circuit comprising means for attenuating pressure pulsations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3154—Accumulator separating means having flexible separating means the flexible separating means being completely enclosed, e.g. using gas-filled balls or foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3156—Accumulator separating means having flexible separating means characterised by their attachment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/405—Housings
    • F15B2201/4056—Housings characterised by the attachment of housing components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/605—Assembling or methods for making housings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A pulsating or comfort damper intended to be in­tegrated into an anti-locking brake system for motor vehicles, in particular a servo-assisted anti-lock brake system, is provided. The comfort damper A is placed within a block B of valves SV, PRV connected by a passage c through which circulates brake fluid. The comfort damper A comprises a multitude of damping membranes 1 perpendicularly positioned to the passage c by means of a centring element 2, a spacer ring 3 and pressing rings 4, which are tightly sealed by a clinch pot 5, so that a multitude of air chambers a are sealed. By this configuration, the pul­sations of the brake fluid are absorbed and the propagation of vibrations in the hydraulic circuit is mitigated. A valve block B containing such a comfort damper A is also disclosed.

Description

Comfort damper
The invention refers to a comfort damper, designed to be integrated into anti-lock hydraulic brake systems, in particular servo-assisted brake systems.
In principle, such a servo-assisted brake system contains hydraulic valves arranged within a valve block, one self-priming pump per wheel circuit, as well as an enhanced master cylinder setup used to reduce the amount of pedal pressure needed for braking - among other hydraulic components connected by a hydraulic circuit. In order to damp the pulsations/shocks produced by opening/closing the valves and induced by pump in the brake fluid, there is also provided a pulsation damper, also known as comfort damper. By this arrangement, there are combined the advantages of a greater overall stability with a higher braking power, especially under emergency braking.
In this respect, WO 2012161835 Al, published on 29 November 2012, belonging to Continental Automotive Systems, Inc. describes an electronically controlled hydraulic brake system and a method for reducing wear of the brake pads. It is disclosed a hydraulic system equipped for anti-slip control and for active brake intervention and which has a self-priminq pump. A pressure retention vale prevents the brake system's low-pressure accumulator and the wheel brakes from beinq evacuated below atmospheric pressure durinq a sensitive brake operation. A two-position valve deactivates the bias of the pressure retention valve by openinq a fluid path from the low-pressure accumulator to the pump when it is desired that the wheel brakes be retracted farther to reduce draq and excessive wear of the brake friction elements .
The disadvantage of the above-mentioned configuration is given by the fact that the efficacy of the pulsation damping depends on the distance to the pulsation sources, mainly the hydraulic valves. The longer the distance, the lower the pump performance, especially at low temperatures, which renders the comfort damper less effective.
Another disadvantage of the afore-mentioned configuration is that, if the elastic membrane is damaged, there is no other available component able to absorb the pulsations unless the entire comfort damper is replaced.
The present invention addresses at least one above-mentioned disadvantages .
Besides the need of compacting as much as possible the volume occupied by the comfort damper, there is also a need to enhance the damping efficacy.
Therefore, the technical problem to be solved is to increase the damping surface inside a compact comfort damper.
The object of the invention is to provide a reliable compact comfort damper which implies low efforts and costs in manufacture and assembly.
According to the invention, this obj ect is achieved by the subj ect matters of the independent claims, namely a comfort damper as well as a valve block equipped with such a comfort damper. Further advantageous embodiments are the subject matter of the dependent claims .
According to a first aspect, the invention provides a comfort damper comprising a multitude of damping membranes perpen dicularly positioned to a directly connecting passage between valves by means of a centering element, a spacer ring and pressing rings, and tightly sealed by a clinch pot, by that a multitude of sealed air chambers are formed, and act as air cushions able to absorb the pulsations of the brake fluid.
The advantage of such a configuration is that the air chambers placed in the flow path of the brake fluid ensure enough extension space for damping membranes, as to be able to absorb any pressure peaks induced in the brake fluid by opening/closing the valves . By this arrangement, the further propagation of pulsations in the hydraulic circuit is mitigate.
According to a second aspect, the invention provides a valve block provided with a corresponding profiled bore as to be able to accommodate the mentioned comfort damper.
By this specific arrangement, the advantage is that only one working interface has to be machined, meaning reduced manufacturing operations and costs.
According to a preferred embodiment of the comfort damper according to the invention, each damping membrane is provided with rims at both ends and has an undulated tubular portion formed by a continuous succession of projections and recesses.
The advantage of such a configuration is that the fluid is obligated to follow a certain path between the damping membranes, and the damping surface is distributed, reducing the risk of being damaged.
According to an exemplary embodiment of the comfort damper, the outer diameter of the rim exceeds the outer diameter of the undulated tubular portion.
The advantage of such a configuration is that a support area is ensured, the exceeding portion also ensuring the sealing of the air chambers.
According to another exemplary embodiment of the comfort damper, the centering element has a base and a central cylindrical pylon, the base ensuring the support for the multitude of damping membranes .
According to another exemplary embodiment of the comfort damper, the spacer ring is a cylinder with vertical cuts equally spaced on circumference, in order to allow the brake fluid to pass through .
According to another exemplary embodiment of the comfort damper, each pressing ring is a disc with raised edge and provided with a number of passage holes equal to the number of damping membranes, each passage hole having the same diameter as the internal diameter of the damping membrane.
By this configuration, the damping membranes are firmly mounted and fixed into position.
According to another exemplary embodiment of the comfort damper, the diameter of the base is equal to the outer diameter of pressing rings and the outer diameter of the spacer ring. Further on, the clinch pot has a cylindrical portion with an outer diameter equal to the outer diameter of pressing ring, continued with an annular sealing ring. Moreover, the clinch pot has an orifice which allows the insertion of the central pylon for a portion exceeding the height of the damping membrane. The multitude of damping membranes is symmetrically spaced along the central pylon, while the spacer ring is kept in place by the pressing rings, so as by placing the clinch pot on top of them and sealing the whole assembly by clinching, so as to compose a cartridge able to keep the positional stability of the damping membranes under the pressured brake fluid.
This design facilitates the insertion of the mentioned components into a cartridge.
By using the invention, the advantages are that the overall design is more reliable and compact, the mounting is simpler and the lifetime of such an assembly is extended, since it is able to function even in the unlikely case one damping membrane is damaged.
For a better understanding of the invention and the advantages thereof, an exemplary embodiment of the invention is given, with reference to the attached figures, in which similar reference numbers designate similar parts. The figures represent:
Fig. 1 - longitudinal section through a valve block from prior art;
Fig. 2 - exploded view of a comfort damper according to the invention, seen from one side;
Fig. 3 - longitudinal section through the comfort damper according to the invention;
Fig. 4 - view of a four damping membranes of the composition of the comfort damper according to the invention;
Fig. 5 - view of a centering element of the composition of the comfort damper according to the invention;
Fig. 6 - view of a spacer ring of the composition of the comfort damper according to the invention;
Fig. 7 - view of two pressing rings of the composition of the comfort damper according to the invention;
Fig. 8 - view of a clinch pot of the composition of the comfort damper according to the invention;
Fig. 9 - transversal section through the comfort damper according to the invention.
Fig. 1 shows a valve block B used in the prior art configuration, comprising a suction valve SV and a pressure retention valve PRV between which there is positioned a comfort damper CD of a known design. In order to obtain this arrangement, there is a need for an additional bore in the valve block, in order to host the comfort damper, as well as a channel to link the comfort damper to the hydraulic circuit between the suction valve and the pressure retention valve.
In the prior art configuration from Fig. 1, for example, the valve block contains a non-return suction valve and a pressure retention valve, between which is inserted the pulsation damper. The usual pulsation damper has as components an elastic membrane, usually a high-pressure diaphragm, and a cover, usually a clinch pin. On the side facing the brake fluid, the membrane is designed as a substantially inverse cup-shaped body, with flat bottom and side walls bent upwardly, ending into a flat edge on which the cover is supported. The cover is inserted into a space between the side walls of the membrane and is joined by clinching. The cover has a cavity inside, so to provide space for the membrane extension. Thus, by extension of the membrane under the pressured brake fluid, pulsations and oscillations given in the system by opening/closing the valves are absorbed.
This arrangement means additional operations to be performed, with additional related costs.
Fig. 2 represents an exploded view of a comfort damper according to the invention, seen from one side. In order to avoid such afore-mentioned additional efforts, the comfort damper A comprises a multitude of damping membranes 1 perpendicularly positioned to a passage c directly connecting suction valve SV of a pump (not shown) and pressure retention valve PRV of a low pressure accumulator LPA. Damping membranes 1 are supported by a centering element 2 and a spacer ring 3 and aligned by means of pressing rings 4, and further on tightly sealed by a clinch pot 5. In this manner multiple air chambers a are formed, corresponding to the internal space of each damping membrane 1, in which will be always a volume of air, as long as the assembly remains sealed.
The above-mentioned air chambers a are visible in Fig. 3, which contains a longitudinal section through the comfort damper, mounted inside valve block B, in order to give more details about the arrangement of the damping membranes with respect to the other components .
Fig. 4 represents a view of a group of damping membranes, in particular four of them, as components of the comfort damper according to the invention. In order to ensure both functions of sealing and damping, each damping membrane 1 is provided with rims 101 at both ends and has an undulated tubular portion consisting of a continuous succession of projections 102 and recesses 103. The outer diameter of rim 101 exceeds the outer diameter of the undulated tubular portion, by this design rim 101 providing a wider contact surface, therefore a better grip. The undulated tubular portion has the role of damping, since the air enclosed in the sealed air chamber a is a compressible medium able to absorb pressure-induced vibrations.
Fig. 5 is view of a centering element which support the group of damping membranes 1. Centering element 2 has a circular base 201 and a central cylindrical pylon 202, the base 201 bearing the multitude of damping membranes 1. On the other end, clinch pot has an orifice o which allows the insertion of central pylon 202 for a portion exceeding the height of damping membrane 1.
Further on, the figures 6, 7 and 8 offer details about the spacer ring 3 (Fig. 6) , the pressing rings 4 (Fig. 7) and the clinch pot 5 (Fig. 8) of the comfort damper A. In order to position and align damping membranes 1, one spacer ring 3 and two pressing rings 4 are provided. Spacer ring 3 is a cylinder with vertical cuts g egually spaced on circumference, in order to allow the brake fluid to pass through, providing in the same time the support framework for the entire assembly. Each pressing ring 4 is a disc with raised edge 401 and provided with a number of passage holes h equal to the number of damping membranes 1 used in the assembly, each passage hole h having the same diameter as the internal diameter of damping membrane 1.
Lastly, fig. 9 shows a transversal section through the comfort damper according to the invention. The multitude of damping membranes 1 are symmetrically spaced along the central pylon 202, while spacer ring 3 is kept in place by pressing rings 4, so as by placing the clinch pot 5 on top of them and sealing the whole assembly by clinching, there is provided a cartridge able to keep the positional stability of damping membranes 1 under the pressured brake fluid. The cartridge design is favored by the fact that the outer diameter of base 201 is equal to the outer diameter of pressing rings 4 and the outer diameter of spacer ring 3, and clinch pot 5 has a cylindrical portion with an outer diameter egual to the outer diameter of pressing ring 4, continued with an annular sealing ring 501. Thus, the assembly can be easily inserted in the special bore drilled in valve block B. In order to facilitate the mounting in any position of the comfort damper according to the invention, two flycuts f are previously cut on both sides of the bore along passage channel c - with the advantage that a dedicated station in the assembly line doesn't need to be changed.
Mounting the comfort damper according to the invention is carried out in a few steps: first, in the special bore drilled in the valve block B, is introduced the centering element 2, upon it the first pressing ring 4, then the spacer ring 3, then the damping membranes 1 and the second pressing ring 4. By clinching the clinch top 5 on top of them, the assembly is sealed and stable.
In order to achieve the best overall results, different materials are used for different components, such as:
free-cutting steel, for clinch pot, pressing rings and centering element;
- plastic, for spacer ring;
- rubber, for damping membrane.
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.
List of reference signs
1 Damping membrane
2 Centering element
3 Spacer ring
4 Pressing ring
5 Clinch pot
101 End rim
102 Projection
103 Recess
201 Base
202 Pylon
401 Edge
501 Sealing ring
A Comfort damper
B Valve block
SV Suction valve
PRV Pressure retention valve
a Air chamber
g Interstitial cut
h Passage hole
o Orifice
f Flycut
P Centering orifice

Claims (11)

1. Comfort damper (A) intended to be integrate into antilocking brake systems for motor vehicles, in particular servo-assisted brake systems, placed within a block (B) of valves (SV, PRV) connected by a passage (c) through which circulates brake fluid and having as damping element a membrane, characterized by that the comfort damper (A) comprises a multitude of damping membranes (1) perpendicularly positioned to the passage (c) connecting the valves (SV, PRC) by means of a centering element (2), a spacer ring (3) and pressing rings (4), and tightly sealed by a clinch pot (5), so that a multitude of air chambers (a) are sealed, and act as air cushions able to absorb the pulsations of the brake fluid.
2. Comfort damper (A) according to claim 1, characterized by that each damping membrane (1) is provided with rims (101) at both ends and has an undulated tubular portion formed by a continuous succession of projections (102) and recesses (103).
3. Comfort damper (A) according to claims 1 and 2, characterized by that the outer diameter of the rim (101) exceeds the outer diameter of the undulated tubular portion.
4. Comfort damper (A) according to claims 1-3, characterized by that the centering element (2) has a base (201) and a central cylindrical pylon (202), the base (201) ensuring the support for the multitude of damping membranes (1).
5. Comfort damper (A) according to claim 1 characterized by that the spacer ring (3) is a cylinder with vertical cuts (g) equally spaced on circumference, in order to allow the brake fluid to pass through .
6. Comfort damper (A) according to claim 1, characterized by that each pressing ring (4) is a disc with raised edge (401) and provided with a number of passage holes (h) equal to the number of damping membranes (1), each passage hole (h) having the same diameter as the internal diameter of the damping membrane (1).
7. Comfort damper (A) according to preceding claims, characterized by that the diameter of the base (201) is equal to the outer diameter of pressing rings (4) and the outer diameter of the spacer ring (3) .
8. Comfort damper (A) according to any preceding claims, characterized by that the clinch pot (5) has a cylindrical portion with an outer diameter equal to the outer diameter of pressing ring (4), continued with an annular sealing ring (501).
9. Comfort damper (A) according to any preceding claims, characterized by that the clinch pot (5) has an orifice (o) which allows the insertion of the central pylon (202) for a portion exceeding the height of the damping membrane (1).
10. Comfort damper (A) according to any of preceding claims, characterized by that the multitude of damping membranes (1) is symmetrically spaced along the central pylon (202), while the spacer ring (3) is kept in place by the pressing rings (4), so as by placing the clinch pot (5) on top of them and sealing the whole assembly by clinching, so as to compose a cartridge able to keep the positional stability of the damping membranes (1) under the pressured brake fluid.
5 11. Valve block (B) containing the comfort damper (A) according to claims 1 to 16, characterized by that it has a corresponding profiled bore with flycuts (f) as to be able to accommodate the comfort damper (A).
1206 18
Amendments to claims have been filed as follows
Patent claims
1. Comfort damper (A) placed within a block (B) of valves (SV, PRV) connected by a passage (c) through which circulates brake
5 fluid and having as damping element a membrane, character!zed by that the comfort damper (A) comprises a multitude of damping membranes (1) perpendicularly positioned to the passage (c) connecting the valves (SV, PRC) by means of a centering element (2), a spacer 10 ring (3) and pressing rings (4), and tightly sealed by a clinch pot (5), so that a multitude of air chambers (a) are sealed, and act as air cushions able to absorb the pulsations of the brake fluid.
15 2. Comfort damper (A) according to claim 1, characterized by that each damping membrane (1) is provided with rims (101) at both ends and has an undulated tubular portion formed by a continuous succession of projections (102) and recesses (103).
3. Comfort damper (A) according to claims 1 and 2, character!zed by that the outer diameter of the rim (101) exceeds the outer diameter of the undulated tubular portion.
4. Comfort damper (A) according to claims 1-3, character!zed by that the centering element (2) has a base (201) and a central cylindrical pylon (202), the base (201) ensuring the support for 30 the multitude of damping membranes (1).
5. Comfort damper (A) according to claim 1, character!zed by that
1206 18 the spacer ring (3) is a cylinder with vertical cuts (g) equally spaced on circumference, in order to allow the brake fluid to pass through.
5 6. Comfort damper (A) according to claim 1, character!zed by that each pressing ring (4) is a disc with raised edge and provided with a number of passage holes (h) equal to the number of damping membranes (1), each passage hole (h) having the same diameter as 10 the internal diameter of the damping membrane (1).
7. Comfort damper (A) according to preceding claims, character!zed by that the diameter of the base (201) is equal to the outer diameter of 15 pressing rings (4) and the outer diameter of the spacer ring (3) .
8. Comfort damper (A) according to any preceding claims, character!zed by that the clinch pot (5) has a cylindrical portion with an outer 20 diameter equal to the outer diameter of pressing ring (4), and an annular sealing ring (501).
9. Comfort damper (A) according to any preceding claims, character!zed by that
25 the clinch pot (5) has an orifice (o) which allows the insertion of the central pylon (202) for a portion exceeding the height of the damping membrane (1).
10. Comfort damper (A) according to any of preceding claims,
30 characterized by that the multitude of damping membranes (1) is symmetrically spaced along the central pylon (202), while the spacer ring (3) is kept in place by the pressing rings (4).
11. Valve block (B) containing the comfort damper (A) according to claims 1 to 10, characterized by that it has a corresponding profiled bore with flycuts (f) as to be able to accommodate the 5 comfort damper (A).
GB1717528.2A 2017-10-25 2017-10-25 Comfort damper Active GB2567834B (en)

Priority Applications (1)

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GB1717528.2A GB2567834B (en) 2017-10-25 2017-10-25 Comfort damper

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GB2567834A true GB2567834A (en) 2019-05-01
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010092861A (en) * 2000-03-27 2001-10-27 밍 루 Noise reduction device of anti-lock brake system
DE102014217408A1 (en) * 2014-09-01 2016-03-03 Robert Bosch Gmbh Damping element of a piston pump of a vehicle brake system
US20170057478A1 (en) * 2015-09-02 2017-03-02 Mando Corporation Pulsation damping device of hydraulic brake system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010092861A (en) * 2000-03-27 2001-10-27 밍 루 Noise reduction device of anti-lock brake system
DE102014217408A1 (en) * 2014-09-01 2016-03-03 Robert Bosch Gmbh Damping element of a piston pump of a vehicle brake system
US20170057478A1 (en) * 2015-09-02 2017-03-02 Mando Corporation Pulsation damping device of hydraulic brake system

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GB2567834B (en) 2019-10-23
GB201717528D0 (en) 2017-12-06

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