WO2008019824A1 - Device and method for automatically changing the tyre pressure of a pneumatic tyre of a vehicle wheel - Google Patents
Device and method for automatically changing the tyre pressure of a pneumatic tyre of a vehicle wheel Download PDFInfo
- Publication number
- WO2008019824A1 WO2008019824A1 PCT/EP2007/007182 EP2007007182W WO2008019824A1 WO 2008019824 A1 WO2008019824 A1 WO 2008019824A1 EP 2007007182 W EP2007007182 W EP 2007007182W WO 2008019824 A1 WO2008019824 A1 WO 2008019824A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- pressure medium
- arm
- nozzle
- inlet valve
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
Definitions
- the present invention relates to an apparatus and a method for automatically changing the tire pressure of a pneumatic tire of a vehicle wheel, in particular of a motor vehicle wheel.
- DE 199 61 020 A1 describes a device in which a compressor arranged in the vehicle puts air under pressure and if necessary leads through a pressure medium line into the pneumatic tire.
- the pressure medium line is guided through the hub of the suspension and connected by means of a quick coupling with a connection hose, which opens into the rim of the vehicle wheel, so that the compressed air can get into the tire interior.
- the quick coupling is rotatably held in the pressure medium line and therefore subject to high wear, which almost inevitably leads to leaks at this point after a certain period of operation.
- the object of the invention is to provide an apparatus and a method for automatically changing the tire pressure of a pneumatic tire of a vehicle wheel, which during driving, i. when the vehicle wheel rotates, allow an automatic change in the tire pressure, without the existing in known systems of this type leak problems.
- the device should also be simple and robust to ensure trouble-free operation for a long time.
- the device according to the invention comprises a rim and a pneumatic tire which is mounted on the rim for rotation therewith about an axis of rotation.
- the rim and the pneumatic tire thus form a vehicle wheel intended for rotatable mounting on a vehicle.
- the device according to the invention further comprises a pressure medium source for supplying pressurized pressure means, which is intended for attachment to a part of the vehicle which is fixed to the vehicle relative to the rotatable wheel.
- the pressure medium source for example, an electrically operated Compressor, which is powered by the electrical system of a motor vehicle with electrical energy and the pressure medium, usually air, if necessary, pressurized.
- Such a compressor may be mounted at any suitable location of the motor vehicle, for example in the engine compartment of the motor vehicle.
- the source of pressure medium can also be a pressure vessel containing pressurized fluid and from which the fluid is called when needed.
- a combination of these two pressure fluid sources is also possible, for example, a compressor can pressurize the pressure fluid independent of a current need and lead into a pressure vessel in which it is stored for further use.
- the device according to the invention comprises at least one inlet valve, which is arranged on an inner peripheral surface of the rim facing the axis of rotation of the vehicle wheel, and also a radially directed arm, which is intended for mounting on the axle on the vehicle side, with the pressure medium source in pressure-medium-conducting connection and at its free end remote from the axle, has a pressure medium exit nozzle which, for increasing the tire pressure of the pneumatic tire, is capable of being brought into a state of temporary engagement with the intake valve and which is otherwise unrelated to the intake valve.
- a plurality of intake valves are arranged distributed over the circumference of the rim, wherein all inlet valves are advantageously located on one and the same circumferential line of the rim, so that with the vehicle wheel rotating, all inlet valves successively pass the pressure medium outlet nozzle of the arm, without any change the position of the arm is necessary.
- the pressure medium exit nozzle only cooperates with the inlet valve or the inlet valves when an increase in the tire pressure is to take place. If the vehicle wheel rotates, the temporary interaction between the pressure medium outlet nozzle and each inlet valve takes place contactlessly. However, during standstill of the vehicle and thus of the vehicle wheel, mechanical contact of the pressure medium outlet nozzle with an inlet valve may occur during the temporary interaction.
- the OF INVENTION ⁇ dung modern device can also be designed such that during the zeitweili ⁇ gen interaction is always a mechanical contact between the Pressure medium outlet nozzle and an inlet valve comes. Even with such an embodiment, however, the mechanical contact between the pressure medium outlet nozzle and an inlet valve is canceled again after the desired tire pressure change.
- the Druckstoffausbergsdüse from the free end of the arm in the radial direction can be extended.
- this radial extension of the pressure medium outlet nozzle takes place pneumatically.
- the pressure medium exit nozzle which is for the purpose of temporarily interacting with the or each inlet valve, the radial distance between the pressure medium exit nozzle and the inlet valve or the inlet valves located on the inner circumference of the rim is reduced.
- the approach of the pressure fluid exit nozzle to the or each inlet valve improves the efficiency with which pressure fluid can be delivered through the or each inlet valve into the rim and thus into the pneumatic tire. In the retracted state, however, the Druckstoffausbergsdüse is closed and protected against mechanical damage.
- the latter is preferably extendable into a first working position in which the nozzle is radially close to the inlet valve, but not in contact with the same. In this first working position then pressure medium exits from the nozzle, which is below a first pressure which is higher than the tire pressure.
- the or each inlet valve is adapted to open by the pressure pulse of the pressurized fluid under the first pressure. In this way, non-contact tire pressure increase is possible even with the vehicle wheel rotating, since the jet of pressurized fluid emerging from the nozzle is capable of momentarily opening the or each intake valve when an intake valve is in operation a rotation of the rim past the pressure medium outlet nozzle.
- each inlet valve is recessed with respect to the rim surface forming the inner circumference, the recess extending circumferentially on both sides beyond the inlet valve and shaped to direct the jet of pressurized fluid exiting the nozzle to the inlet valve.
- the time duration is increased during which a filling of the pneumatic tire with pressure medium can take place with a passage of an inlet valve at the pressure medium outlet nozzle.
- At least one outlet valve is also arranged on the radial inside of the rim facing the axis of rotation, on which each inlet valve is arranged.
- the device according to the invention is preferably designed so that in the first working position of the nozzle selectively pressure medium exiting the nozzle, which is at a second pressure which is higher than the first pressure.
- the or each outlet valve is preferably configured to be opened only by the pressure pulse of the pressurized fluid under the second pressure, and is further designed so that the amount of pressure fluid flowing out of the pneumatic tire when the exhaust valve is open is greater than that inflowing pressure medium amount is.
- This can be achieved, for example, by suitably arranged and dimensioned outflow channels, which allow more pressure fluid to flow out of the pneumatic tire when the outlet valve is open than to pass into the pneumatic tire through the pressure fluid jet under the second pressure. In this way, by operating the device according to the invention at the second pressure, the tire pressure of a pneumatic tire can be lowered.
- each outlet valve is preferably located in a recess in the rim that directs the pressure fluid exiting the nozzle to the outlet valve.
- an intake valve and an exhaust valve are each disposed in the same recess.
- the device according to the invention can be designed such that in front of a tire pressure change process first pressure medium from the nozzle exits, which is under a lower pressure than said first pressure. This pressure medium is used to remove possible contamination on the intake valves or exhaust valves, without it already comes to an opening of the valves.
- each outlet valve is arranged on the same circumferential line as the or each inlet valve, each outlet valve being arranged circumferentially apart from the or each inlet valve.
- the arm holding the Druckschausbergsdüse be arranged rotatably and it is still an automatic change of the tire pressure while driving possible because each exhaust valve and each inlet valve repeatedly move past the pressure fluid outlet nozzle.
- the device is operated either with the first pressure or the second pressure.
- pressure medium in an undesirable manner passes through each inlet valve in the pneumatic tire, but this fact can be compensated by a suitable dimensioning of the exhaust valves or, so that it comes to a reduction in tire pressure ,
- all of the exhaust valves are arranged on a circumferential line which is offset in the axial direction of the rim to the circumferential line on which all intake valves are arranged.
- the arm carrying the Druckstoffausbergsdüse may also be arranged rotationally fixed, but must be axially displaceable, if it has only one Druckstoffausbergsdüse to selectively interact with the intake valves or the exhaust valves can.
- the arm has two juxtaposed pressure medium exit nozzles which are arranged so that one nozzle can interact with the inlet valve (s) and the other nozzle with the outlet valve (s).
- the arm When the arm is axially displaceable or has two juxtaposed nozzles (one nozzle each for the inlet and outlet valves, respectively), it is not necessary to operate the apparatus at a second pressure higher than the first pressure in order to operate the apparatus To open exhaust valves. Instead, be designed so that they open at the first pressure both the A ⁇ outlet valves and the exhaust valves.
- the arm is pivotally mounted about the axis of rotation of the vehicle wheel. With such a configuration, it is possible to carry out a change in tire pressure even when the vehicle is stationary, because specifically approached an intake valve or exhaust valve
- the arm preferably has a sensor which is able to recognize an inlet valve and / or outlet valve.
- This sensor may be an optical, capacitive or inductive sensor, an ultrasonic sensor is also possible. Any sensor that can act alone or in combination with a mating element on the corresponding valve is able to recognize when the desired valve is located opposite the pressure medium outlet nozzle. If the rim includes means for determining its respective rotational position, the position of an intake or exhaust valve may also be determined by calculation only. In any case, with such a device, the i5 arm is pivoted about the axis while the vehicle is stationary until its free end is opposite an inlet valve and / or outlet valve. The desired tire pressure change can then be carried out without contact as described above.
- the device just described can also be designed so that the or each Druckstoffaus Stammsdüse when the vehicle is stationary in a second working position can be extended, in which it gets into contact, in particular in sealing contact, with an inlet valve or exhaust valve. In this way, losses of pressure medium can be prevented, which is the result of non-contact tire pressure changes.
- the device according to the invention can be designed such that a continuous jet exits the pressure medium outlet nozzle when a tire pressure change
- the device may be configured to constantly “blow” (at the first pressure or the second pressure) when a tire pressure change is desired.
- the device is preferably designed such that pressure medium only exits the pressure medium outlet nozzle when an inlet valve or outlet valve in the
- the device according to the invention and the method according to the invention are preferably set up to react to signals from such a tire pressure detection or monitoring device and automatically perform a requested change in the tire pressure. In this way, using the device according to the invention or the method according to the invention, a novel automatic tire pressure regulation system is obtained.
- FIG. 1 shows an overall view of a first embodiment of a device according to the invention
- FIG. 2 shows an enlarged view of essential parts of the device from FIG. 1,
- FIG. 3A is a plan view of the first embodiment shown in FIG.
- FIG. 3B shows the detail K from FIG. 3A in an enlarged view
- FIG. 4A shows a pivotable arm of the device shown in Figures 1 to 3 in an enlarged view and in section
- FIG. 4B shows the detail F from FIG. 4A in an enlarged view and in a state in which a pressure medium outlet nozzle is closed
- FIG. 4C shows the detail F in a state in which the pressure medium outlet nozzle is open
- FIG. 5 shows a view similar to FIG. 2 of a second embodiment of the device according to the invention
- Figure 6A shows a cross section through the device according to the invention according to the second embodiment
- Figure 6B shows the detail M of Figure 6A in an enlarged view.
- a device for automatically changing the tire pressure of a pneumatic tire of a vehicle wheel is generally designated 10.
- the illustrated in Figure 1 first embodiment of the device 10 is shown in conjunction with a motor vehicle wheel 12, which includes a rim 14 and a mounted on the rim for rotation with her pneumatic tire 16.
- the vehicle wheel 12 may be, for example, the front wheel of a passenger car, which is rotatably mounted in a conventional manner on a pivot pin 18 of the front wheel suspension of the vehicle.
- the axle pin 18 defines an axis of rotation A about which the vehicle wheel 12 rotates during operation.
- a brake disc 20 Connected to the vehicle wheel 12 for rotation about the axis A is a brake disc 20, which is overlapped by a brake caliper 22, which forms a Sectionbelaginbremse for braking the rotation of the vehicle wheel 12 together with other parts, not shown here.
- An essential part of the device 10 is an arm 24 which is rotatably mounted on the axle pin 18 by means of a bearing ring 26 and which extends radially with respect to the axis A in the direction of the inner rim peripheral side of the rim 14.
- an elbow 28 At the axle bolt near the end of the arm 24 is an elbow 28, which is part of a pressure medium line, not shown, through which a pressure medium, in this case compressed air, from a likewise not shown pressure medium source the arm 24 can be supplied.
- a Druckschausbergsdüse 30 which is able to cooperate with an inlet valve 32 which is arranged in a recess 34 also referred to as Strömungsleitaus supraung the rim 14 (see in particular Figure 3B).
- the intake valve 32 is thus mounted on the inner peripheral surface of the rim 14 and, when opened, establishes a fluid-conducting connection between the interior of the tire 16 and the external environment. It should be noted at this point that this only works if the tire 16 is a tubeless tire, but other tires are barely used today.
- pressure medium can enter the arm 24 and reach it through a channel 36 to the pressure medium outlet nozzle 30.
- the channel 36 has a circular cross-section in the example shown.
- a sealing ram 38 Centrally located in the channel 36 is a sealing ram 38 which extends through the entire channel 36 and tapers conically at its end adjacent to the pressure medium outlet nozzle 30.
- the flow cross-section available for guiding the pressure medium in the channel 36 is accordingly annular.
- the Druckstoffaus Stammsdüse 30 consists of a substantially hollow cylindrical portion 40 having a nozzle opening 42 and a first annular flange 44 at the end of the part 40, in which the nozzle opening 42 is disposed, and a second annular flange 46 at the opposite end of the part 40.
- a compression spring 48th which is arranged around the central portion of the part 40, is supported at one end to the inside of the second annular flange 46 and at its other end to an annular projection 50 in the channel 36, which also serves for the axial guidance of the part 40.
- the compression spring 48 thus biases the hollow cylindrical part 40 into the closed position shown in FIG.
- FIG. 4C shows the opening position of the Druckstoffaus Stammsdüse 30 in which the compression spring 48 is compressed and about half the length of the hollow cylindrical portion 40 is extended from the free end of the arm 24. Pressure medium can then flow past the conically tapered part of the sealing ram 38 past the hollow cylindrical part 40 to the opening 42 and out of it.
- FIG. 4C shows the pressure medium outlet nozzle 30 in a first working position, into which the nozzle 30 is moved, when the pressure medium in the channel 36 is below a first pressure pl, which is higher than the highest expected tire pressure in operation.
- the interaction of the pressure medium outlet nozzle 30 with the inlet valve 32 will now be explained in greater detail.
- the radial distance between the nozzle opening 42 and the inlet valve 32 is reduced.
- the nozzle 30 extends only so far that it does not come into contact with the rim 14.
- Under the pressure pl standing pressure medium leaves the pressure medium outlet nozzle 30 jet-shaped and is able to open the inlet valve 32, which is shown here schematically by a spring 52 and a ball 54 which is pressed by the spring 52 in the closed position.
- a small amount of air always reaches the pneumatic tire 16 to increase the tire pressure when, during operation, the inlet valve 32 moves past the pressure medium outlet nozzle 30 and pressure medium escapes from the nozzle 30.
- a plurality of inlet valves are distributed over the circumference of the rim 14, in the illustrated embodiment, two inlet valves 32, each of which sits at the bottom of an associated recess 34, the pressure medium jet leaving the nozzle 30 in a region over which the recess 34 in the circumferential direction - Direction extends to the inlet valve 32, when the nozzle 30 is not exactly above the inlet valve 32.
- an outlet valve 56 which can be opened by a pressure p2 that is greater than the pressure p1, is also arranged on the edge of each depression 34.
- Each outlet valve 56 has a plunger 58 or similar actuator on which acts under the pressure p2 standing and the nozzle 30 leaving pressure medium to open the outlet valve 56.
- the outlet valve 56 is schematically shown here as consisting of a spring 60 and a ball 62 which is pressed by the spring 60 in a sealing position.
- Each exhaust valve 56 is configured to release a flow area as it is opened, allowing more fluid to flow out of the tire 16 than can flow through the adjacent intake valve 32 and / or the exhaust valve 56 simultaneously.
- each inlet valve 32 opens momentarily as it passes the pressure fluid exit nozzle 30 due to the rotation of the vehicle wheel 12 and the fluid jet exiting the nozzle orifice 42 strikes the inlet valve 32 and the flow-conducting recess 34, respectively, in which the inlet valve 32 is located is.
- the tire pressure is thus increased in small fast steps to the desired value.
- the pressure medium supply is then turned off, whereupon the pressure medium outlet nozzle 30 their
- a sensor 64 disposed at the free end of the arm 24 detects each recess 34 and provides a signal to a control, not shown, of the device 10, which opens the pressure medium supply into the channel 36 of the arm 24 only when a recess 34 from the sensor 64 has been recognized.
- the device 10 is operated at the pressure p2, which is greater than the pressure pl and is able to open each outlet valve 56 analogous to the inlet valve 32.
- the tire pressure is thus reduced in small quick steps to the desired value.
- the arm 24 is rotatably disposed about the axis A.
- a motor 66 which is fixed to the arm 24 and drives a worm 68 which engages in a corresponding toothing on the bearing ring 26 and depending on the direction of rotation of the motor 66, the arm 24 can rotate back and forth. In this way, it is possible, even at a standstill of a vehicle, ie to make a tire pressure increase or decrease in non-rotating vehicle wheel 12, as by means of the rotatable arm 24 which are randomly approached during vehicle standstill position of an intake valve 32 or exhaust valve 56 targeted can.
- this can then also be operated at a pressure p3>p2> pl, in which the pressure medium outlet nozzle 30 extends as far as the arm 24 until it is in contact with the inlet valve 32 or outlet valve 56 device.
- the compression spring 48 may be designed in two stages (not shown), wherein only the higher pressure p3 for compression of the second spring stage leads and thus a further extension of the nozzle 30 is possible only in this operating state. Because an intake valve 32 or exhaust valve 56 is specifically approached in this operating state, the higher pressure p3 can be used both for tire pressure increase and for tire pressure reduction, ie for opening the intake valve 32 or the exhaust valve 56.
- all the intake valves 32 and exhaust valves 56 are arranged on one and the same circumferential line of the rim 14.
- the intake valves 32 are located on a peripheral line which is offset in the axial direction of the rim 14 to a circumferential line on which all the exhaust valves 56 are located.
- two pressure medium outlet nozzles 30a, 30b are arranged at a distance from one another at the free end of the arm, which corresponds to the offset of the two circumferential lines on which the inlet valves 32 and outlet valves 56 are located.
- two channels 36a, 36b each with a sealing ram 38a, 38b arranged. The other function corresponds to the function described in connection with the first embodiment.
- the arm 24 has only one nozzle 30, but is designed to be axially displaceable.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112007001919T DE112007001919A5 (en) | 2006-08-14 | 2007-08-14 | Device and method for automatically changing the tire pressure of a pneumatic tire of a vehicle wheel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006038179.3 | 2006-08-14 | ||
DE102006038179 | 2006-08-14 |
Publications (1)
Publication Number | Publication Date |
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WO2008019824A1 true WO2008019824A1 (en) | 2008-02-21 |
Family
ID=38690528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/007182 WO2008019824A1 (en) | 2006-08-14 | 2007-08-14 | Device and method for automatically changing the tyre pressure of a pneumatic tyre of a vehicle wheel |
Country Status (2)
Country | Link |
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DE (1) | DE112007001919A5 (en) |
WO (1) | WO2008019824A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10953707B2 (en) | 2015-12-29 | 2021-03-23 | Bridgestone Americas Tire Operations, Llc | Air distribution system for rapid tire inflation |
US10953706B2 (en) | 2015-12-29 | 2021-03-23 | Bridgestone Americas Tire Operations, Llc | Air storage system for rapid tire inflation |
US11021023B2 (en) | 2015-12-29 | 2021-06-01 | Bridgestone Americas Tire Operations, Llc | Rapid tire inflation system with air compressor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105365500A (en) * | 2015-12-07 | 2016-03-02 | 徐州猎奇商贸有限公司 | Vehicle tyre pressure control system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4598750A (en) * | 1984-11-16 | 1986-07-08 | Gant Lawrence A | Tire inflation/deflation system |
WO2000015451A1 (en) * | 1998-09-11 | 2000-03-23 | Innovationssupport Ab | Swivel connection for controlling of the air pressure in a tyre for a vehicle |
DE19961020A1 (en) * | 1999-12-17 | 2000-06-21 | Post Dieter | Automatic tire air pressure control with integrated tire defect elimination for all cars is operated electronically in next to no time from inside car and whole system is joined rigidly with car |
-
2007
- 2007-08-14 WO PCT/EP2007/007182 patent/WO2008019824A1/en active Application Filing
- 2007-08-14 DE DE112007001919T patent/DE112007001919A5/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4598750A (en) * | 1984-11-16 | 1986-07-08 | Gant Lawrence A | Tire inflation/deflation system |
WO2000015451A1 (en) * | 1998-09-11 | 2000-03-23 | Innovationssupport Ab | Swivel connection for controlling of the air pressure in a tyre for a vehicle |
DE19961020A1 (en) * | 1999-12-17 | 2000-06-21 | Post Dieter | Automatic tire air pressure control with integrated tire defect elimination for all cars is operated electronically in next to no time from inside car and whole system is joined rigidly with car |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10953707B2 (en) | 2015-12-29 | 2021-03-23 | Bridgestone Americas Tire Operations, Llc | Air distribution system for rapid tire inflation |
US10953706B2 (en) | 2015-12-29 | 2021-03-23 | Bridgestone Americas Tire Operations, Llc | Air storage system for rapid tire inflation |
US11021023B2 (en) | 2015-12-29 | 2021-06-01 | Bridgestone Americas Tire Operations, Llc | Rapid tire inflation system with air compressor |
Also Published As
Publication number | Publication date |
---|---|
DE112007001919A5 (en) | 2009-06-25 |
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