DE102007036201A1 - Valve i.e. freewheel valve, for vehicle tire, has pressure chamber with piston that does not create friction between cover and body and seals cover and body such that piston surrounds control and pressure chambers with body - Google Patents

Abstract

The valve i.e. freewheel valve (5) has a control chamber (23), and a body (20) closed by a cover (21). A leakage chamber (24) is connected outwards by an air exhaust hole (25). A pressure chamber (26) is connected with a content by a borehole (27) and comprises a piston (22), which does not create a friction between the cover and the body and seals the cover and the body such that the piston is hermetically connected with the cover, and surrounds the control and pressure chambers with the body, and the leakage chamber with the cover. The piston allows flow connection between the chambers.

Description

Of the The technical scope of the following invention includes the control systems and the pressure control of a room content, e.g. B. a vehicle tire.

In connection with the above-mentioned field of application, it has already been proposed to use a pneumatic valve for the tire filling and the discharge of air from a conventional tire. The principle of tire inflation and deflation of a vehicle tire using remotely controlled valves has already been in the patents FR-2616194 . FR-2667826 and EP-0731655 explained.

Of the Use of these valves is based on the following technique: It come Flaps are used, which in a first position, the passage allow compressed air in a volume. In a second flap position, the air from the volume content to the outside dissipated and guaranteed a third so-called rest position the closing of the pneumatic circuit.

In order to That works, the flap is generally a higher Pressure than that exposed in the volume to the compressed air supply too to enable this volume. There is this pressure much lower than the pressure in the volume, even negative. This allows the air outlet from the volume to the outside.

These Systems for extracting the volume with low, positive or negative pressure have one major disadvantage: the flaps used because of the membrane diameter and other necessary devices blocked.

One another major disadvantage of low pressure systems but far below the targeted minimum pressure for suction of the volume content, there is a risk of instability the suction process.

systems, which use a negative pressure to exhaust the volume, also have the serious shortage that it causes difficulties to achieve this negative pressure in a vehicle as well. moreover fails the tightness of the necessary pipe joint that the flap is supplied with this negative pressure from the air source.

It is also crucial in these developments, that flap as reliable as possible works so that they immediately react to "pneumatic commands" can.

If now the lasting reliability of a pneumatic one The device wants to achieve that, as is the case with a tire is exposed to a polluted air, then you have to understand dispense with any device that contains moving components and are exposed to friction, or those requiring rapid elimination of liquids or impurities.

Any Friction would result in hysteresis effects from the control system difficult to handle. Much more serious but would be any blockages in the penetration of foreign bodies between the rubbing parts.

task It is an object of this invention to overcome all these problems by introducing a pneumatic component, the while driving a quick suction of the space allowing, with a positive pressure on the component exercised, which is much higher than that for this volume targeted maximum pressure. It will be all previously explained reliability and tightness criteria, d. H. the component is small in size, does not cause friction and does not hinder the removal of foreign objects that are in the tire. Traditional operations like tire inflation, Pressure measurement or slow deflation of air can be like usually performed.

at This invention is thus a valve for inflating and suction of the volume and its pressure measurement. This volume consists of a closed with a lid surface and is divided into the following chambers: A control chamber in conjunction with a suction station; an outflow chamber through an air vent secures the connection to the outside; a with the volume through a bore connected pressure chamber. These Pressure chamber contains a moving piston, which no Friction between the lid and body causes and both parts seals. This piston is hermetically connected to the lid, In its content, the different elements are bounded by its course and connects the different chambers: on the one hand, the housing with the control and pressure chamber, on the other hand, the lid with the control and outflow chamber.

It Now follows a description of the main features of the piston. This is hermetically connected to the lid by a metal bellows, which in turn is attached to the lid.

Due to the traction of the bellows and with the help of a sealing material, the piston remains constantly in contact with one on the lid socket. A bore leads to a flap in the piston.

These Flap consists of a ball attached to a pedestal by a restraint system on the piston.

The Restraint system consists of deformable lips, which are supported on a cover of the ball.

in the Relative to the piston becomes the restraint system held in place by a ring.

Around to allow a pumping up of the volume remains the Flap ball due to tire inflation pressure in contact with the ground.

Around to allow a quick inflation of the volume, remain the flap and the piston with the ground in touch.

Of the The main advantage of this invention is that the development the vehicle tire has a simplified structure which makes it possible to to monitor the tire inflation pressure with the help of all integrated elements and by the small size of the freewheel valve to survey the exact status.

One Another important advantage of this invention is the fact that No negative pressure required for valve control is. This significantly facilitates the operation of the controller and the sealing rings, which are part of the connection of the tire rotation area and the immovable system area.

In The following drawing will now be used for information purposes Describe properties and advantages.

The 1 shows the schematic section of a vehicle tire according to the present invention in connection with an inflating device;

the 2 shows a section of an embodiment of the freewheel valve in its idle state;

The 3a and 3b show two different states of the freewheel valve during operation.

In the 1 you see the tire 1 a vehicle, not shown, consisting of the rim 2 on which an external shell 3 is mounted. This shell represents the volume 4 ie, a volume that may contain air pressure. The rims 2 contains a freewheel valve 5 in that the following elements are interconnected: on the one hand, the line 6 with the volume 4 and on the other hand with the control device 7 through the pipe 8th , connected by a pipe joint 9 and a connection chamber 18 ,

The control device 7 is of known type and usually includes a suction station 10 , a control unit 11 together with a keyboard 12 and an electropneumatic assembly 13 ,

An advantageous addition to the control device 7 consists of the following elements: one in the volume 4 integrated pressure and temperature detector 15 , one in the control unit 11 integrated receiver 14 as well as a pressure sensor 16 and one in the electropneumatic assembly 13 integrated Auströmungsvorrichtung 17 , The task of these last elements will be described below.

In the 2 becomes the valve 5 shown according to the invention. It consists of a through a lid 21 closed body 20 and contains a piston 22 , On the cover side, will be different chambers of this piston 22 delimited: Through the connecting chamber 18 , the pipe joint 9 and the line 8th , leads a control chamber 23 to the control device 7 ( 1 ); an outflow chamber 24 is through a vent hole 25 connected to the outside. On the body side: one with the volume 4 through a hole 27 connected pressure chamber 26 , with the guidance 6 connected to the rim ( 1 ). The air vent hole 25 is in the lid 21 and in the body 20 ; the hole 27 is located in the body as shown in the figure 20 ,

The piston 22 is hermetic with the lid 21 through a metal bellows 28 connected, on the one hand, by a ring 29 on the lid and on the other hand on the piston 22 through a washer 30 is attached.

Together with the valve 5 generates the control device 7 three different pressure levels in the control chamber 23 the valve according to the invention, through the conduit 8th , the pipe joint 9 and the connection chamber 18 , The first pressure level corresponds to the atmospheric pressure, the second corresponds to either the tire inflation pressure, the pressure according to the measured value or the pressure by slow discharge of air and the third corresponds to the pressure for rapid deflation.

The control chamber 23 So it is with the pneumatic control device 7 and ensures a variable pressure supply that is greater than that for the volume 4 targeted maximum pressure, or a pressure that is much greater as the same maximum pressure in the pipe 8th , Pipe joint 9 and connection chamber 18 ,

The shut-off of the valve is thus on the one hand by the acting force of the metal bellows 28 controlled, which connects the closure with the valve cover and the other by the volume in the space 4 prevailing pressure. This ensures double safety to block any air passage as long as the valve does not respond to a "pneumatic command".

The piston 22 contains a central hole 37 with built-in flap 33 and contains a favorable truncated or hemispherical outer part 34 , This part contains a sealing mechanism 35 that is on the pedestal 36 of the lid 21 supports under the influence of the constantly acting traction of the metal bellows 28 and additionally by the existing pressure in the pressure chamber 26 ,

In one of these possible developments, the flap 33 the shape of a hole in the hole 37 inserted ball 39 , This flap contains on the side of the control chamber 23 a pedestal 38 and serves this ball 39 as a tight support. On the body side, the flap contains one of the ball 39 removable lip device 40 with a ring 41 who's the ball 39 Controls when using the contact piece 42 the valve body comes into contact.

The opening and height of the ring 41 are planned to be an escape of the bullet 39 is prevented. The height of the ring 41 was also chosen to be any contact between the ring and the ground of the body 20 to avoid. Thus, the detachment of the ball 39 secured in any case.

The flap 33 thus directs the ball 39 in two different positions, divided by the removable lip device 40 , and then, when the ball is on the pedestal 38 rushed from its rest position moved to its second position and then with the contact piece 42 the valve body comes into contact.

The piston central bore 37 can be closed on the lid side with the help of a plate 32 by a spring 31 with the washer 30 connected is. This plate 32 is subjected to pressure from the controller 7 comes before this on the ball 39 effect. In case of very high pressure from the device 7 becomes the plate 32 directly exposed to this high pressure, the spring 31 is compressed and drives the piston 22 at; this then drives the ball 39 in the direction of the contact piece 42 of body 20 , The feather 31 is calibrated to withstand low pressure. This low pressure will only affect the movement of the ball 39 Direction contact piece 42 of body 20 cause; The piston 22 remains in its original position.

2 shows the freewheel valve in the normal closed position, ie the volume 4 was pumped up ( 1 ) and the outgoing pressure from him, z. B. 3 bar, ensures that the ball 39 in her pedestal 38 with the hole 37 stays in contact and that the piston 22 in the lid 21 with his pedestal 34 stays in touch.

3a shows the ball 39 in their position during inflation, during the pneumatic pressure measurement or during the slow release of air from the volume 4 ,

Starting from the control chamber 23 , from the controller 7 out ( 1 ), a gas pressure is supplied for this purpose, the z. B. by 1 bar is greater than the targeted for the tire maximum pressure. This pressure causes the ball to lift off 39 from her pedestal 38 and her move to a second position, where she then with the contact piece 42 of the valve body 20 comes in contact after she has the lip 40 removed and led by Ring 41 , her last movement begins. To inflate the volume, the compressed air supply from the control device runs 7 to the volume 4 ( 1 ). The course is the following: control chamber 23 , Drilling 37 , Ring 41 and pressure chamber 26 ; The hole 27 and the line 6 of the rim ( 1 ) provide for a pumping up of the volume 4 ,

If the air supply is interrupted after this tire inflation pressure, then the ball remains 39 in their position, as in 3a shown. It then comes to pressure equalization between the controller 7 and the volume 4 ( 1 ). The pressure measurement of the room contents 4 can now be beneficial through the sensor 16 be made in the electropneumatic assembly 13 is integrated ( 1 ), or by the in the volume 4 integrated sensor 15 in connection with the control unit 11 and the receiver 14 ,

A slow release of air from the volume 4 is also possible, through the Auströmungsvorrichtung 17 ( 1 ). This allows a very controlled, gradual deflation through the electropneumatic assembly 13 ( 1 ) with their corresponding connections to the volume 4 , This air outlet can be advantageously controlled by a pressure reading from the sensor 16 ( 1 ), which is in the electropneumatic assembly 13 is integrated, or by the volume in the volume 4 integrated sensor 15 ( 1 ), in conjunction with the control unit 11 and the receiver 14 ( 1 ). In this structure is the ball 39 still in its open position through the lip 40 , Its resistance to the ball pass is greater than the acting force on the ball, a force that results from the small difference in pressure between the space 4 and the electropneumatic block.

Noteworthy here is that the ring 41 closing the air supply and clamping the ball 39 prevented.

3a shows a different position of the piston 22 and the ball 39 in the rapid deflation of the space content 4 ( 1 ). Starting from the control chamber 23 , For this purpose, a strong pressure in the connection chamber 18 supplied ( 1 ), the z. B. 2 times larger than that for the volume 4 targeted maximum pressure. This pressure sets the piston 22 moving. Guided by the bellows 28 This piston is stable on the contact piece 42 of the valve body 20 overthrown. This is done with the help of the ball 39 , which presses the piston on its base, resulting in a complete tightness between the high-pressure connection chamber 18 ( 1 ) and the pressure chamber 26 guaranteed. The movement of the piston 22 as well as his lifting off his pedestal 36 allows a free circulation of air between the volume 4 and the outflow chamber 24 , where the following elements are involved: The rim line 6 ( 1 ); the hole 27 of the valve block 20 ; the pressure chamber 26 ,

A quick deflation of the space so finds out through the air vent hole 25 instead (see arrows), adding the air through the volume 4 flows ( 1 ), through the pipe 27 to the outflow chamber 24 ,

Of course this system is applied to all vehicle tires; simplicity Half here is shown only a tire.

Thus, according to the invention, a control system is added to the previously described tire to control the pressure in the volume 4 to control and this automatically according to certain criteria, such. As the transported load or the terrain condition to change.

Obviously such a possibility is welcome by the users. Depending on whether the vehicle is fully loaded, half-loaded or empty, Namely, the vehicle structure is not claimed equally. The same applies if the vehicle is on intersected terrain traveling, on sandy ground, on a road or on a highway. The control of the tire inflation pressure makes it is possible to reduce such stresses and puts sure they match the mobility and security criteria. It also contributes to the normal life of the vehicle at. A precise intervention in tire inflation pressure every single vehicle tire even allows the To optimize mobility and safety conditions.

It On the other hand, it is important at all times to know the exact condition of the vehicle tires to know, especially in cases of burst tires or irrecoverable damage.

With this assembly, the following operations can be performed: Inflating or deflating the tire from the wheel 1 or a group of tires, as appropriate; automatic monitoring of one or a group of tires by means of a constant temperature and pressure indication; an automatic pressure adjustment of the tire as a result of an instruction; The acquisition and location of an externally open volume; a balancing of the same opening; A separation of the tire from the rest of the system, if compensation is not possible; The information transmission of an overspeed and a corresponding pressure correction.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• FR 2616194 [0002]
• FR 2667826 [0002]
• EP 0731655 [0002]

Claims (10)

Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ), consisting of a through a lid ( 21 ) closed body ( 20 ), a control chamber ( 23 ) in connection with a suction station ( 7 ), an outflow chamber ( 24 ) through a vent hole ( 25 ) connected to the outside, one with the volume ( 4 ) through a hole ( 27 ) connected pressure chamber ( 26 ), characterized in that said pressure chamber comprises a movable piston ( 22 ) containing no friction between lids ( 21 ) and body ( 20 ) and seals both parts, this piston ( 22 ) is hermetically connected to the lid, and wherein this piston ( 22 ) on the one hand with the body ( 20 ) the control chamber ( 23 ) and the pressure chamber ( 26 ), on the other hand with the lid ( 21 ) the outflow chamber ( 24 ), said piston having means for establishing flow communication between the different chambers ( 23 . 24 . 26 ). Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to claim 1, wherein the piston ( 22 ) hermetically with the lid by a metal bellows ( 28 ), which in turn is attached to the lid ( 21 ) is attached. Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to claim 2, wherein the piston ( 22 ) constantly in contact with one on the lid ( 21 ) attached socket ( 36 ), under the influence of the constantly acting traction of the bellows ( 28 ) with the aid of a sealing material ( 35 ). Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to any one of claims 1 to 3, wherein 22 ) a hole ( 37 ) to a position with a closure flap ( 33 ) leads. Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to claim 4, wherein said flap ( 33 ) from a sphere ( 39 ), which in the bore ( 37 ) on a pedestal ( 38 ) is attached by a restraint system ( 40 ) on the piston ( 22 ). Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to claim 5, wherein the restraint system ( 40 ) consists of a deformable lip which is on a cover of the ball ( 39 ) is supported. Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to claim 6, wherein the restraint system ( 40 ) through a ring ( 41 ) is connected to the piston. Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to any one of claims 4 to 7, wherein the valve is a closure flap ( 32 ) for the piston bore ( 37 ), the effect of the return spring ( 31 ) is exposed. Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to any one of claims 4 to 7, wherein in order to inflate the volume ( 4 ), closure flap ball ( 33 . 39 ) because of the tire inflation pressure with the substrate ( 20 ) remains in contact. Valve ( 5 ) for pressure measurement and for pumping and aspirating a volume ( 4 ) according to any one of claims 4 to 7, wherein in order to allow a fast discharge of air from the volume ( 4 ) to allow the closure flap ( 33 ) and the piston ( 22 ) with the underground ( 20 ) stay in touch.