WO2014168529A1 - A vehicle low pressure brake arrangement - Google Patents

A vehicle low pressure brake arrangement Download PDF

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Publication number
WO2014168529A1
WO2014168529A1 PCT/SE2013/050383 SE2013050383W WO2014168529A1 WO 2014168529 A1 WO2014168529 A1 WO 2014168529A1 SE 2013050383 W SE2013050383 W SE 2013050383W WO 2014168529 A1 WO2014168529 A1 WO 2014168529A1
Authority
WO
WIPO (PCT)
Prior art keywords
braking
low pressure
vehicle
ground
volume
Prior art date
Application number
PCT/SE2013/050383
Other languages
French (fr)
Inventor
Erik Rydsmo
Yngve Håland
Christian Svensson
Dan BRÅSE
Original Assignee
Autoliv Development Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Autoliv Development Ab filed Critical Autoliv Development Ab
Priority to US14/783,141 priority Critical patent/US9656638B2/en
Priority to EP13881738.2A priority patent/EP2983953B1/en
Priority to PCT/SE2013/050383 priority patent/WO2014168529A1/en
Priority to JP2016507514A priority patent/JP6172780B2/en
Publication of WO2014168529A1 publication Critical patent/WO2014168529A1/en

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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
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/12—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting otherwise than by retarding wheels, e.g. jet action
    • B60T1/14—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting otherwise than by retarding wheels, e.g. jet action directly on road
    • 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
    • B60T3/00—Portable devices for preventing unwanted movement of vehicles, e.g. chocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
    • F16D63/008—Brakes acting on a linearly moving member

Definitions

  • the present invention relates to a vehicle braking arrangement comprising a braking plate and a link arrangement arranged to connect the braking plate to a vehicle.
  • the braking plate 7 is movable from a rest position with a certain ground clearance to a braking position where contact is made with the ground.
  • the braking plate further comprises a sealing rim running circumferentially and being arranged to at least partially contact the ground in the braking position, such that an at least partly enclosed volume then is formed between the braking plate and the ground.
  • a braking plate may be lowered.
  • a vacuum chamber of the plate faces the road, the vacuum chamber being evacuated such that a retaining function is obtained by the plate being pressed against the road due to the lowered pressure in the vacuum chamber.
  • the lowered pressure is obtained by means of a gas generator acting on a so-called Venturi tube.
  • a braking plate may be lowered to the road and where a volume formed between the plate and the road may be subject to a lowered pressure such that the plate is pressed towards the road.
  • the time for lowering the pressure should be sufficient for obtaining a suitable braking effect, and the lowering of the pressure should be more rapidly performed than in prior arrangements of this kind.
  • a vehicle braking arrangement comprising a braking plate and a link arrangement arranged to connect the braking plate to a vehicle.
  • the braking plate 7 is movable from a rest position with a certain ground clearance to a braking position where contact is made with the ground.
  • the braking plate further comprises a sealing rim running circumferentially and being arranged to at least partially contact the ground in the braking position, such that an at least partly enclosed volume then is formed between the braking plate and the ground.
  • the vehicle braking arrangement further comprises a low pressure container that is fluidly connected to the volume via a valve assembly.
  • the air pressure in the low pressure container is below the air pressure of ambient air when the braking plate is in its rest position.
  • the valve assembly is arranged to be opened when the braking plate is in the braking position such that the pressure is lowered in the volume and the braking plate is pressed against the ground by a conferred pressure difference between air outside the volume and air in the volume.
  • the valve assembly comprises a trigger pin, at least one locking pin, a piston and a housing, the piston being co-axially arranged in the housing.
  • the housing comprises at least one aperture that connects the low pressure container to the interior of the housing.
  • the piston is locked in sealing engagement with the housing by said locking pin.
  • the trigger pin is arranged to release the piston by acting on said locking pin when the trigger pin is pressed against the ground, the released piston allowing a fluid connection between the volume and the low pressure container to be established.
  • the low pressure container is connected to a supporting arrangement for maintaining a low pressure after an at least partial pressurization of the low pressure container.
  • the supporting arrangement may comprise a braking system.
  • Figure 1 shows a schematic side view of a vehicle during normal running
  • Figure 2 shows a top perspective view of a vehicle braking arrangement according to the present invention in a normal running position
  • Figure 3 shows a schematic side view of a vehicle during use of the vehicle braking arrangement according to the present invention
  • Figure 4 shows a top perspective view of a vehicle braking arrangement according to the present invention in a braking position
  • Figure 5 shows a bottom perspective view of a vehicle braking arrangement according to the present invention
  • Figure 6 shows a sectional side view of the of the vehicle braking arrangement a moment before meeting the ground
  • Figure 7 shows a sectional side view of the vehicle braking arrangement at the moment the braking plate meets the ground
  • Figure 8 shows an exploded view of the valve assembly
  • Figure 9 shows a sectional side view of the vehicle braking arrangement when the piston is unlocked.
  • Figure 10 shows a sectional side view of the vehicle braking arrangement when the valve assembly is opened.
  • the emergency braking system 6 comprises a braking plate 7 connected to the bottom floor 5 by means of a link arm 8 which is pre-tensioned by a spring device 18. As shown in Figure 1, the braking plate is maintained in a rest position during normal running conditions, more or less obscured by the outer body of the vehicle 1, and preferably arranged to not disturb the vehicle's normal ground clearance G.
  • the link arm 8 comprises a beam 25 which is attached to the bottom floor 5.
  • Figure 3 and Figure 4 corresponds to Figure 1 and Figure 2, but here the emergency braking system 6 is shown with the braking plate 7 in the braking position.
  • the link arm 8 has been released such that a rapid displacement of the braking plate 7 to a braking position has been performed. In the braking position, the braking plate is in contact with the ground 4.
  • Figure 5 shows a bottom view of the emergency braking system 6
  • Figure 6 shows a sectional side view of the emergency braking system 6 a moment before the braking plate 7 meets the ground 4
  • Figure 7 shows a sectional side view of the emergency braking system 6 at the moment the braking plate 7 meets the ground 4.
  • the braking plate comprises a sealing rim 9, running circumferentially and providing a sealing between the braking plate 7 and the ground 4.
  • a volume 10 is formed in the braking plate 7.
  • the enclosed volume 10 is formed between the braking plate 7 and the ground 4, when the braking plate is in the braking position.
  • the volume 10 may not be & completely enclosed due to leakage in the sealing rim 9, for example due to unevenesses in the surface of the ground 4.
  • the emergency braking system 6 comprises a low pressure container 11 that is fluidly connected to the volume 10 via a valve assembly 12, where the air pressure in the low pressure container 11 is below the air pressure of ambient air when the emergency braking system 6 is in its normal running position.
  • the valve assembly 12 When the valve assembly 12 is opened, the pressure is rapidly lowered in the volume 10, such that the braking plate 7 is pressed against the ground 4.
  • the air pressure in the low pressure container 11 is initially much lower then the air pressure of ambient air, preferably essentially vacuum.
  • the braking plate 7 is pressed against the ground 4 such that a retaining force between the braking plate 7 and the ground 4 is obtained. This results in a braking force between the braking plate 7 and the ground 4.
  • the braking plate 7 may comprise high friction components such as rubber pads.
  • valve assembly 12 constitutes an interface between the volume 10 and the low pressure container 11.
  • the valve assembly 12 comprises a trigger pin 13, four locking pins 14a, 14b, 14c, 14d, a piston 15 and a housing 16, the piston 15 being co-axially arranged in the housing 16.
  • the housing 16 comprises circumferentially arranged apertures 17a, 17b, 17c, 17d that connect the low pressure container 11 to the interior of the housing 16.
  • the trigger pin 13 blocks the locking pins 14a, 14b, 14c, 14d, the piston 15 being in sealing engagement with the housing 16.
  • the locking pins 14a, 14b, 14c, 14d lock the piston 15 to the housing 16 in an axial direction, the locking pins 14a, 14b, 14c, 14d running in corresponding apertures 19a, 19b (only two of four shown in Figure 8) in the piston 15, and arranged to be locking against a circumferentially running shoulder edge 20 in the housing 16.
  • the cylinder 15 has moved to such a position that there now is a fluid connection from the volume 10 to the low pressure container 11, air now being evacuated from the volume 10 to the low pressure container 11 via the apertures 17a, 17b, 17c, 17d, for example as indicated with a dash-dotted air flow arrow 24.
  • the pressure in the volume is lowered relative the air surrounding the braking plate 7, the braking plate 7 being pressed towards the ground 4.
  • the retaining force is dependent of the magnitude of pressure drop, as well as of the sealing properties of the sealing rim 9.
  • valve assembly 12 By means of this arrangement, a secure and almost instant opening of the valve assembly 12 when the braking plate 7 hits the ground 4 is obtained. Due to the relative short time of braking effect, the timing of when opening the valve assembly 12 is critical for the function of the brake.
  • Other types of valve arrangements are of course conceivable, the one described only being an example.
  • a pyrotechnical charge may be arranged to open a valve element when the braking plate 7 hits the ground 4.
  • the low pressure container 11 may alternatively be connected to a supporting arrangement 21 for maintaining a low pressure after an at least partial pressurization of the low pressure container 11.
  • the low pressure container 11 is connected to the supporting arrangement 21 by means of a pipe 22, hose or similar, via a suitable valve arrangement 23.
  • the supporting arrangement 21 is only shown schematically as a box, and may be constituted in a number of ways. A number of examples follow below.
  • a supporting arrangement 21 may be constituted by one or several auxiliary low pressure containers which suitably are connected one at a time or in any other suitable previously configured manner.
  • One or several valves are used for such an arrangement, said valve being controlled by for example pressure levels and/or electrical signals.
  • Another example of a supporting arrangement 21 is an existing low pressure source in the vehicle, suitably a brake system of a vehicle with a vacuum brake system, such as a truck.
  • the use of an existing low pressure source in the vehicle requires that the low pressure source is connected to the low pressure container 11 via a valve arrangement 23 that suitably is in the form of a one-way valve.
  • the low pressure container 11 does not have to arranged on the braking plate 7, but may be arranged at any suitable position in the vehicle, and be connected to the braking plate 7 via a pipe, hose or similar, via a suitable valve arrangement.
  • the rapid displacement of the braking plate 7 to the braking position may be accomplished in many ways, with or without the use of a spring device 18, for example by means of a pyrotechnical charge acting on a suitable arrangement on the link arm 8.
  • the emergency braking system 6 is generally constituted by a vehicle braking arrangement.
  • the low pressure container 11 may be equipped with a pressure detector or pressure meter, which for example is arranged to indicate the air pressure in the low pressure container 11, or, alternatively, only whether the air pressure in the low pressure container 11 is below a certain predetermined pressure level or not.
  • the low pressure container 11 could be regularly checked by means of such a pressure detector or pressure meter, and, if needed, its pressure could be lowered.
  • the low pressure container 11 is preferably constituted by a separate part that is sealed and normally does not require any additional lowering of its pressure.
  • the low pressure container 11 may be connected to an arrangement in the vehicle that is arranged to maintain the air pressure in the low pressure container 11 below a certain predetermined pressure level.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Systems And Boosters (AREA)
  • Regulating Braking Force (AREA)

Abstract

The present invention relates to a vehicle braking arrangement (6) comprising a braking plate (7) connected to a vehicle (1) by a link arrangement (8). The braking plate (7) is movable from a rest position to a braking position where contact is made with the ground (4), and comprises a sealing rim (9) arranged to at least partially contact the ground (4) such that an at least partly enclosed volume (10) is formed. The vehicle braking arrangement (6) comprises a low pressure container (11) connected to the volume (10) via a valve assembly (12). Air pressure in the low pressure container (11) is below the air pressure of ambient air in the braking plate's rest position. The valve assembly (12) is arranged to be opened when the braking plate (7) is in the braking position such that the pressure is lowered in the volume (10) and the braking plate (7) is pressed against the ground (4) by a conferred pressure difference between air outside the volume (10) and air in the volume (10).

Description

TITLE
A vehicle low pressure brake arrangement DESCRIPTION OF THE INVENTION
The present invention relates to a vehicle braking arrangement comprising a braking plate and a link arrangement arranged to connect the braking plate to a vehicle. The braking plate 7 is movable from a rest position with a certain ground clearance to a braking position where contact is made with the ground. The braking plate further comprises a sealing rim running circumferentially and being arranged to at least partially contact the ground in the braking position, such that an at least partly enclosed volume then is formed between the braking plate and the ground.
In many traffic situations it is desired to acquire an enhanced braking effect, for example at collision situations and when the road grip is lost. One way to achieve an enhanced braking effect is described in US 8656685, where a braking plate may be lowered. When lowered, a vacuum chamber of the plate faces the road, the vacuum chamber being evacuated such that a retaining function is obtained by the plate being pressed against the road due to the lowered pressure in the vacuum chamber. The lowered pressure is obtained by means of a gas generator acting on a so-called Venturi tube.
However, for such an arrangement, the time between activation of the braking plate and the evacuation is too long for acquiring a braking effect in time. It is also likely that the pressure fall will be insufficient for obtaining a suitable braking effect whatsoever. It is therefore an object of the present invention to provide an emergency braking arrangement where a braking plate may be lowered to the road and where a volume formed between the plate and the road may be subject to a lowered pressure such that the plate is pressed towards the road. In particular, the time for lowering the pressure should be sufficient for obtaining a suitable braking effect, and the lowering of the pressure should be more rapidly performed than in prior arrangements of this kind.
Said object is achieved by means of a vehicle braking arrangement comprising a braking plate and a link arrangement arranged to connect the braking plate to a vehicle. The braking plate 7 is movable from a rest position with a certain ground clearance to a braking position where contact is made with the ground. The braking plate further comprises a sealing rim running circumferentially and being arranged to at least partially contact the ground in the braking position, such that an at least partly enclosed volume then is formed between the braking plate and the ground.
The vehicle braking arrangement further comprises a low pressure container that is fluidly connected to the volume via a valve assembly. The air pressure in the low pressure container is below the air pressure of ambient air when the braking plate is in its rest position. The valve assembly is arranged to be opened when the braking plate is in the braking position such that the pressure is lowered in the volume and the braking plate is pressed against the ground by a conferred pressure difference between air outside the volume and air in the volume. According to an example, the valve assembly comprises a trigger pin, at least one locking pin, a piston and a housing, the piston being co-axially arranged in the housing. The housing comprises at least one aperture that connects the low pressure container to the interior of the housing. The piston is locked in sealing engagement with the housing by said locking pin. The trigger pin is arranged to release the piston by acting on said locking pin when the trigger pin is pressed against the ground, the released piston allowing a fluid connection between the volume and the low pressure container to be established.
According to another example, the low pressure container is connected to a supporting arrangement for maintaining a low pressure after an at least partial pressurization of the low pressure container. The supporting arrangement may comprise a braking system.
Other examples are evident from the dependent claims.
A number of advantages are obtained by means of the present invention. Mainly, the time for lowering the pressure is sufficient for obtaining a suitable braking effect, and the lowering of the pressure is more rapidly performed than in prior arrangements of this kind.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described more in detail with reference to the appended drawings, where:
Figure 1 shows a schematic side view of a vehicle during normal running; Figure 2 shows a top perspective view of a vehicle braking arrangement according to the present invention in a normal running position; Figure 3 shows a schematic side view of a vehicle during use of the vehicle braking arrangement according to the present invention;
Figure 4 shows a top perspective view of a vehicle braking arrangement according to the present invention in a braking position;
Figure 5 shows a bottom perspective view of a vehicle braking arrangement according to the present invention;
Figure 6 shows a sectional side view of the of the vehicle braking arrangement a moment before meeting the ground; Figure 7 shows a sectional side view of the vehicle braking arrangement at the moment the braking plate meets the ground;
Figure 8 shows an exploded view of the valve assembly;
Figure 9 shows a sectional side view of the vehicle braking arrangement when the piston is unlocked; and
Figure 10 shows a sectional side view of the vehicle braking arrangement when the valve assembly is opened.
DETAILED DESCRIPTION With reference to Figure 1, showing a side view of a vehicle 1, where the vehicle 1 comprises wheels 2, 3 which are in contact with the ground 4 during normal running. Here, the vehicle 1 is assumed to be running in a forward direction F. At the rear of the vehicle 1, attached to a bottom floor 5, an emergency braking system 6 is arranged.
Also with reference to Figure 2, showing the emergency braking system 6 more in detail in its normal running position, the emergency braking system 6 comprises a braking plate 7 connected to the bottom floor 5 by means of a link arm 8 which is pre-tensioned by a spring device 18. As shown in Figure 1, the braking plate is maintained in a rest position during normal running conditions, more or less obscured by the outer body of the vehicle 1, and preferably arranged to not disturb the vehicle's normal ground clearance G. The link arm 8 comprises a beam 25 which is attached to the bottom floor 5.
With reference to Figure 3 and Figure 4, an emergency situation has been detected, and additional braking is required. Figure 3 and Figure 4 corresponds to Figure 1 and Figure 2, but here the emergency braking system 6 is shown with the braking plate 7 in the braking position. The link arm 8 has been released such that a rapid displacement of the braking plate 7 to a braking position has been performed. In the braking position, the braking plate is in contact with the ground 4.
Figure 5 shows a bottom view of the emergency braking system 6, Figure 6 shows a sectional side view of the emergency braking system 6 a moment before the braking plate 7 meets the ground 4, and Figure 7 shows a sectional side view of the emergency braking system 6 at the moment the braking plate 7 meets the ground 4.
As shown in Figure 5, Figure 6 and Figure 7, the braking plate comprises a sealing rim 9, running circumferentially and providing a sealing between the braking plate 7 and the ground 4. As evident from Figure 7, a volume 10 is formed in the braking plate 7. The enclosed volume 10 is formed between the braking plate 7 and the ground 4, when the braking plate is in the braking position. The volume 10 may not be & completely enclosed due to leakage in the sealing rim 9, for example due to unevenesses in the surface of the ground 4.
According to the present invention, the emergency braking system 6 comprises a low pressure container 11 that is fluidly connected to the volume 10 via a valve assembly 12, where the air pressure in the low pressure container 11 is below the air pressure of ambient air when the emergency braking system 6 is in its normal running position. When the valve assembly 12 is opened, the pressure is rapidly lowered in the volume 10, such that the braking plate 7 is pressed against the ground 4. In order to obtain this effect, the air pressure in the low pressure container 11 is initially much lower then the air pressure of ambient air, preferably essentially vacuum. The braking plate 7 is pressed against the ground 4 such that a retaining force between the braking plate 7 and the ground 4 is obtained. This results in a braking force between the braking plate 7 and the ground 4. In order to enhance the braking effect, the braking plate 7 may comprise high friction components such as rubber pads.
A sufficiently low pressure may be maintained up to a number of seconds, during which a braking effect is achieved. In the following, a more detailed description of the emergency braking system 6 will be described. With reference to Figure 6, Figure 7 and Figure 8, where Figure 8 is showing an exploded view of the valve assembly 12 and the low pressure container 11, the valve assembly 12 constitutes an interface between the volume 10 and the low pressure container 11. The valve assembly 12 comprises a trigger pin 13, four locking pins 14a, 14b, 14c, 14d, a piston 15 and a housing 16, the piston 15 being co-axially arranged in the housing 16. The housing 16 comprises circumferentially arranged apertures 17a, 17b, 17c, 17d that connect the low pressure container 11 to the interior of the housing 16.
As shown in Figure 6, the trigger pin 13 blocks the locking pins 14a, 14b, 14c, 14d, the piston 15 being in sealing engagement with the housing 16. The locking pins 14a, 14b, 14c, 14d lock the piston 15 to the housing 16 in an axial direction, the locking pins 14a, 14b, 14c, 14d running in corresponding apertures 19a, 19b (only two of four shown in Figure 8) in the piston 15, and arranged to be locking against a circumferentially running shoulder edge 20 in the housing 16.
In Figure 7, the braking plate 7 has reached the ground 4, and the trigger pin 13 has been pressed against the ground depressed into the piston 15. In this position, the locking pins 14a, 14b, 14c, 14d are not locked by the trigger pin 13 anymore, but remain in their position at this instant.
In Figure 9, due to the pressure in the low pressure container 11 falling below the pressure in the volume 10, the piston 15 is urged towards the low pressure container 11. Due to wedges in the locking pins 14a, 14b, 14c, 14d, and the wedged shape of the shoulder edge 20, the locking pins 14a, 14b, 14c, 14d are pushed away from the housing 16, into the apertures 19a, 19b in the cylinder 15, by means of the cylinder's movement, the locking pins 14a, 14b, 14c, 14d no longer being blocked by the trigger pin 13. This means that the initial movement of the cylinder 15 performs an unlocking of the cylinder 15 itself relative the housing 16.
As shown in Figure 10, the cylinder 15 has moved to such a position that there now is a fluid connection from the volume 10 to the low pressure container 11, air now being evacuated from the volume 10 to the low pressure container 11 via the apertures 17a, 17b, 17c, 17d, for example as indicated with a dash-dotted air flow arrow 24. As an effect of this, the pressure in the volume is lowered relative the air surrounding the braking plate 7, the braking plate 7 being pressed towards the ground 4. The retaining force is dependent of the magnitude of pressure drop, as well as of the sealing properties of the sealing rim 9.
The steps above with reference to Figure 6, Figure 7, Figure 9 and Figure 10 are performed very rapidly, roughly within 100 milliseconds.
By means of this arrangement, a secure and almost instant opening of the valve assembly 12 when the braking plate 7 hits the ground 4 is obtained. Due to the relative short time of braking effect, the timing of when opening the valve assembly 12 is critical for the function of the brake. Other types of valve arrangements are of course conceivable, the one described only being an example. For example, a pyrotechnical charge may be arranged to open a valve element when the braking plate 7 hits the ground 4.
Furthermore, as shown in Figure 6, Figure 7, Figure 9 and Figure 10, the low pressure container 11 may alternatively be connected to a supporting arrangement 21 for maintaining a low pressure after an at least partial pressurization of the low pressure container 11. The low pressure container 11 is connected to the supporting arrangement 21 by means of a pipe 22, hose or similar, via a suitable valve arrangement 23. The supporting arrangement 21 is only shown schematically as a box, and may be constituted in a number of ways. A number of examples follow below.
A supporting arrangement 21 may be constituted by one or several auxiliary low pressure containers which suitably are connected one at a time or in any other suitable previously configured manner. One or several valves are used for such an arrangement, said valve being controlled by for example pressure levels and/or electrical signals. Another example of a supporting arrangement 21 is an existing low pressure source in the vehicle, suitably a brake system of a vehicle with a vacuum brake system, such as a truck. The use of an existing low pressure source in the vehicle requires that the low pressure source is connected to the low pressure container 11 via a valve arrangement 23 that suitably is in the form of a one-way valve.
Yet another example is a pyrotechnical charge that creates a low pressure, suitably by acting on a so-called Venturi tube. A combination of the several supporting arrangements according to the above is also conceivable.
The low pressure container 11 does not have to arranged on the braking plate 7, but may be arranged at any suitable position in the vehicle, and be connected to the braking plate 7 via a pipe, hose or similar, via a suitable valve arrangement.
The invention is not limited to the examples above, but may vary freely within the scope of the appended claims. For example, the rapid displacement of the braking plate 7 to the braking position may be accomplished in many ways, with or without the use of a spring device 18, for example by means of a pyrotechnical charge acting on a suitable arrangement on the link arm 8.
Many details on the drawings are not discussed in detail, for example how the link arm 8 is constituted, the functionality and suitable forms all such details and arrangements being easily understood by the skilled person.
There may be any suitable number of locking pins and apertures in the housing 16, but at least one of each. The emergency braking system 6 is generally constituted by a vehicle braking arrangement.
The low pressure container 11 may be equipped with a pressure detector or pressure meter, which for example is arranged to indicate the air pressure in the low pressure container 11, or, alternatively, only whether the air pressure in the low pressure container 11 is below a certain predetermined pressure level or not. The low pressure container 11 could be regularly checked by means of such a pressure detector or pressure meter, and, if needed, its pressure could be lowered. However, the low pressure container 11 is preferably constituted by a separate part that is sealed and normally does not require any additional lowering of its pressure.
As an alternative, the low pressure container 11 may be connected to an arrangement in the vehicle that is arranged to maintain the air pressure in the low pressure container 11 below a certain predetermined pressure level.

Claims

CLAIMS 1. A vehicle braking arrangement (6) comprising a braking plate (7) and a link arrangement (8) arranged to connect the braking plate (7) to a vehicle, the braking plate (7) being movable from a rest position with a certain ground clearance to a braking position where contact is made with the ground (4), where the braking plate (7) further comprises a sealing rim (9), running circumferentially and being arranged to at least partially contact the ground (4) in the braking position, such that an at least partly enclosed volume (10) then is formed between the braking plate (7) and the ground (4), characterized in that the vehicle braking arrangement (6) comprises a low pressure container (11) that is fluidly connected to the volume (10) via a valve assembly (12), where the air pressure in the low pressure container (11) is below the air pressure of ambient air when the braking plate (7) is in its rest position, the valve assembly (12) being arranged to be opened when the braking plate (7) is in the braking position such that the pressure is lowered in the volume (10) and the braking plate (7) is pressed against the ground (4) by a conferred pressure difference between air outside the volume (10) and air in the volume (10) such that a retaining force between the braking plate (7) and the ground (4) is obtained.
2. A vehicle braking arrangement according to claim 1, characterized in that the valve assembly (12) comprises a trigger pin (13), at least one locking pin (14a, 14b, 14c, 14d) , a piston (15) and a housing (16), the piston (15) being co-axially arranged in the housing (16), where the housing (16) comprises at least one aperture (17a, 17b, 17c, 17d) that connects the low pressure container (11) to the interior of the housing (16), the piston (15) being locked in sealing engagement with the housing (16) by said locking pin (14a, 14b, 14c, 14d) , the trigger pin (13) being arranged to release the piston (15) by acting on said locking pin (14a, 14b, 14c, 14d) when the trigger pin (13) is pressed against the ground (4), the released piston (15) allowing a fluid connection between the volume (10) and the low pressure container (11) to be established.
3. A vehicle braking arrangement according to any one of the claims 1 or 2, characterized in that the low pressure container (11) is connected to a supporting arrangement (21) for maintaining a low pressure after an at least partial pressurization of the low pressure container (11) .
4. A vehicle braking arrangement according to claim 3, characterized in that the supporting arrangement 21 comprises at least one of:
at least one auxiliary low pressure container;
an existing low pressure source in the vehicle; and
a pyrotechnical charge acting on a Venturi tube.
5. A vehicle braking arrangement according to claim 4, characterized in that the existing low pressure source in the vehicle is constituted by the vehicle's brake system.
6. A vehicle braking arrangement according to any one of the claims 3-5, characterized in that the low pressure container (11) is connected to the supporting arrangement (21) via a one-way valve (23) .
7. A vehicle braking arrangement according to any one of the previous claims, characterized in that the low pressure container (11) is positioned on the braking plate (7) .
8. A vehicle (1) comprising the vehicle braking arrangement according to any one of the claims 1-7.
PCT/SE2013/050383 2013-04-10 2013-04-10 A vehicle low pressure brake arrangement WO2014168529A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US14/783,141 US9656638B2 (en) 2013-04-10 2013-04-10 Vehicle low pressure brake arrangement
EP13881738.2A EP2983953B1 (en) 2013-04-10 2013-04-10 A vehicle low pressure brake arrangement
PCT/SE2013/050383 WO2014168529A1 (en) 2013-04-10 2013-04-10 A vehicle low pressure brake arrangement
JP2016507514A JP6172780B2 (en) 2013-04-10 2013-04-10 Low pressure brake device for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2013/050383 WO2014168529A1 (en) 2013-04-10 2013-04-10 A vehicle low pressure brake arrangement

Publications (1)

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WO2014168529A1 true WO2014168529A1 (en) 2014-10-16

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PCT/SE2013/050383 WO2014168529A1 (en) 2013-04-10 2013-04-10 A vehicle low pressure brake arrangement

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WO2015163812A1 (en) * 2014-04-24 2015-10-29 Autoliv Development Ab A vehicle low pressure brake arrangement
US10137867B2 (en) 2014-04-24 2018-11-27 Autoliv Development Ab Vehicle low pressure brake arrangement
WO2016198284A1 (en) * 2015-06-08 2016-12-15 Autoliv Development Ab Device for enhancing the road adherence of a vehicle
US11220245B2 (en) * 2015-12-28 2022-01-11 Duplicent, Llc Braking system
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EP2983953A4 (en) 2016-11-16
JP6172780B2 (en) 2017-08-02
EP2983953A1 (en) 2016-02-17

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