CN101362423B - Inflated and deflated apparatus for rotary tyre and control system thereof - Google Patents

Abstract

The invention discloses a device for inflating and deflating a rotating tire, which comprises a rotating part composed of an outer sealing plate, an inner sealing plate and a sleeve, and an outer cylinder, an inner cylinder, a rotating sealing ring and a dustproof ring. The non-rotating part consists of two parts. The outer sealing plate is installed on the end of the sleeve close to the wheel, the inner sealing plate is installed on the end of the sleeve away from the wheel, and the inner cylinder is set on the sleeve and located on the inner and outer sealing plates. In between, the outer cylinder is set on the inner cylinder and is located between the inner and outer sealing plates, and a rotating sealing ring is respectively installed between the inner and outer two sealing plates near the inner and outer sealing plates. Compared with the existing technology, the rotary sealing ring is freed from long-term wear and high temperature environment, thereby prolonging the service life and improving the reliability of the entire inflation and deflation system; at the same time, it provides a simple control system implementation method, The whole CTI/DS is simplified.

Description

Device and Control System for Inflating and Deflating Rotating Tires

technical field

The invention relates to a device for inflation and deflation of rotating tires and a control system thereof, in particular to a rotating sealed air chamber and a control system in a central tire inflation and deflation system.

Background technique

The tire central inflation and deflation system (CTI/DS) of off-road vehicles is mainly composed of air source, steering control device, rotary sealing device, wheel valve and connecting air circuit, etc. It is used to adjust the air pressure of the tire to adapt to different road conditions. To improve the maneuverability of the vehicle. The rotary sealing device is one of the key components of the system. It includes two parts, the non-rotating part and the rotating part. The two parts are connected by a rotating sealing ring. The compressed gas from the gas source is realized by the dynamic sealing effect of the rotating sealing ring. Transmit to the rotating tire air chamber, or transmit the gas in the tire air chamber to the atmosphere. During the process of tire inflation and deflation and pressure measurement by CTI/DS, the gas transmission is completed through this device. In the existing technology, the rotary sealing ring is in a state of wear for a long time during the running of the vehicle. When the wear reaches a certain level, the sealing effect of the rotary sealing ring on the gas will decrease, resulting in air leakage and the failure of the entire inflation and deflation system; The long-term wear of the sealing ring will generate a lot of heat, which itself will accelerate the aging speed of the rotating sealing ring. The rotary sealing ring is the key among the keys, which affects the reliability of the entire inflation and deflation system. Therefore, while developing high-performance sealing materials, attention is also paid to improving the structure of the rotary sealing device to minimize the rotation. The wear rate of the sealing ring.

Contents of the invention

The purpose of the present invention is to provide a rotary sealing device, which can free the rotary sealing ring from long-term wear and high temperature environment, thereby prolonging the service life of the rotary sealing ring, thereby improving the reliability of the entire inflation and deflation system; at the same time, providing A simple control system implementation method simplifies the entire CTI/DS.

The scheme that the present invention solves its technical problem adopts is:

A device used to inflate and deflate rotating tires. It consists of two parts: a rotating part and a non-rotating part. The rotating part consists of an outer sealing plate, an inner sealing plate and a sleeve, and the non-rotating part consists of an outer cylinder, an It consists of a cylinder, a rotating sealing ring and a dustproof ring. The outer sealing plate is installed on the end of the sleeve close to the wheel, the inner sealing plate is installed on the end of the sleeve away from the wheel, and the inner cylinder is set on the sleeve and located in the inner, Between the outer two sealing plates, the outer cylinder is set on the inner cylinder and is located between the inner and outer sealing plates, and the positions between the inner and outer two cylinders near the inner and outer sealing plates are respectively installed with rotary seals The outer ring of the rotary sealing ring is airtightly matched with the inner surface of the outer cylinder, the inner ring of the rotary sealing ring is airtightly matched with the outer surface of the inner cylinder, and the working end surface of the rotary sealing ring is in clearance fit with the sealing plate. There are dust-proof rings installed in the grooves of the two end faces of the cylinder, the first air circuit interface a is provided on the cylinder wall of the outer cylinder, the air hole b is provided on the cylinder wall of the inner cylinder, and the second air hole is provided on the outer sealing plate. Two gas path interface c.

The radial dimension of the sealing plate is larger than the radial dimension of the outer cylinder.

Both the first gas path interface a and the air hole b are located on the cylinder wall between the two rotating sealing rings.

A dust-proof ring is installed between the two ends of the outer cylinder and the corresponding sealing plate to prevent dust and moisture in the air from entering the interior and damaging the rotating sealing ring.

The first air circuit interface a is connected to the vehicle air source, and the second air circuit interface c is connected to the wheel valve.

When the compressed gas enters through the first gas circuit interface a, the two rotating sealing rings are driven by the compressed gas to move to both sides and press against the corresponding sealing plate, and the rotating sealing ring and the sealing plate are airtightly matched. , at this time, the rotary sealing device is in working condition, the compressed gas cannot leak to the atmosphere under the sealing effect of the rotary sealing ring, and the compressed gas can only enter the wheel valve through the air hole b and the second gas circuit interface c; when the first gas circuit When there is no compressed gas entering interface a, there is a gap between the rotating sealing ring and the sealing plate, the rotating sealing device is in a non-working state, and the rotating sealing ring does not rotate with the sealing plate but is in a static state. At this time, the rotating sealing ring does not wear .

The electric circuit of the present invention comprises an electronic control unit, an air source, a solenoid valve, a pressure sensor and a wheel valve, and the solenoid valve 8, a pressure sensor, a rotary sealing device and a wheel valve are sequentially connected on the air path from the air source to the tire air chamber; The gas path between the pressure sensor and the solenoid valve 8 is connected with a conduit connected to the outside atmosphere, and a normally closed solenoid valve 9 is set on the conduit; the wheel valve is described in detail in the patent "Pneumatic Wheel Valve" (application number: 200810095414.1); the pressure signal collected by the pressure sensor is transmitted to the electronic control unit, and the electronic control unit controls the opening and closing of each solenoid valve by executing the program flow; the flow chart of the control system is shown in Figure 3.

The whole system works like this:

Select or set the air pressure value of each group of tires according to the road surface conditions, the electronic control unit sends a signal to open the solenoid valve 8, the compressed air from the air source enters the tire air chamber through the rotary sealing device and the wheel valve, after a period of time, the electronic control unit controls The solenoid valve 8 is closed, and the tire is in the deflated state at this time. The electronic control unit reads the pressure signal collected by the pressure sensor and compares it with the set value. If the pressure signal is not greater than the set value and is within the target value range, then The electronic control unit controls the solenoid valve 9 to open, the gas transmission pipeline is deflated, the wheel valve is closed, and the system enters the pressure maintaining state; if the pressure signal is greater than the set value, continue to collect the pressure signal and compare it with the target value, repeat the above process until the collection If the received pressure signal is within the target value range, the electronic control unit controls the solenoid valve 9 to open, and the tire enters the pressure maintaining state from the deflated state; if the collected pressure signal is not greater than the set value and is not within the target value range, the electronic control unit The unit calculates the difference and estimates the inflation time based on the difference, and at the same time opens the solenoid valve 8 to enter the inflation state, closes the solenoid valve 8 again after the inflation time is over, and then compares the collected pressure signal with the set value, if it is not greater than the set value If it is not within the target value range, it will repeatedly estimate the inflation time and enter the inflation state. If it is not greater than the set value and within the target value range, it will enter the pressure maintaining state. If it is greater than the set value, it will enter the deflation state until the collected When the pressure signal is within the range of the target value, the electronic control unit controls the solenoid valve 9 to open to enter the pressure maintaining state.

Compared with the prior art, the present invention frees the rotary sealing ring from long-term wear and high temperature environment, greatly prolonging the service life; the structure is simple, the process is mature, and the manufacturing cost is low; the modification to the vehicle is small and easy to assemble; the control system Be simplified, save energy, be safe and reliable.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the electric circuit connection schematic diagram of the present invention;

Fig. 3 is a flow chart of the control system of the present invention;

In the figure: 1. Outer sealing plate, 2. Outer cylinder, 3. Rotating sealing ring, 4. Dustproof ring, 5. Inner sealing plate, 6. Inner cylinder, 7. Sleeve; a. The first air path Interface, b, air hole, c second gas path interface.

Detailed ways

As shown in the drawings, the outer sealing plate 1 is threaded on the end of the sleeve 7 close to the wheel, the inner sealing plate 5 is threaded on the end of the sleeve 7 away from the wheel, and the inner cylinder 6 is set on the sleeve 7 and is located between the inner sealing plate 5 and the outer sealing plate 1, the outer cylinder 2 is set on the inner cylinder 6 and is located between the inner sealing plate 5 and the outer sealing plate 1, the inner cylinder 6 and the outer cylinder 2 are respectively installed at positions close to the inner sealing plate 5 and the outer sealing plate 1, and the outer ring of the rotating sealing ring 3 is airtightly matched with the inner surface of the outer cylinder 2, and the inner ring of the rotating sealing ring 3 is in contact with the The outer surface of the inner cylinder 6 is airtightly matched, the working end surface of the rotating sealing ring 3 is in clearance fit with the inner sealing plate 5 and the outer sealing plate 1, and a dustproof ring 4 is installed in the grooves of the two end surfaces of the outer cylinder 2 , a first gas circuit interface a is provided on the wall of the outer cylinder 2, an air hole b is provided on the wall of the inner cylinder 6, a second gas circuit interface c is provided on the outer sealing plate 1, and the first gas circuit interface a is connected to the vehicle air source, and the second air circuit interface c is connected to the wheel valve.

The electric circuit of the present invention comprises an electronic control unit, an air source, a solenoid valve, a pressure sensor and a wheel valve, and the solenoid valve 8, a pressure sensor, a rotary sealing device and a wheel valve are sequentially connected on the air path from the air source to the tire air chamber; The gas path between the pressure sensor and the solenoid valve 8 is connected with a conduit connected to the outside atmosphere, and a normally closed solenoid valve 9 is set on the conduit; the wheel valve is described in detail in the patent "Pneumatic Wheel Valve" (application number: 200810095414.1 ); the pressure signal collected by the pressure sensor is transmitted to the electronic control unit, and the electronic control unit controls the opening and closing of each solenoid valve by executing the program flow; the flow chart of the control system is shown in Figure 3.

The direction of rotation of the connecting thread between the sealing plate and the sleeve is determined according to the following principles:

When the vehicle is moving forward, the frictional force transmitted by the rotating sealing ring to the sealing plate makes the thread tighten. The thread direction of the outer sealing plate on the left side of the vehicle is left-handed, and the thread direction of the inner sealing plate is right-handed; the thread direction of the outer sealing plate on the right side of the vehicle is right-handed, and the thread direction of the inner sealing plate is left-handed.

Claims (4)

1. A device for inflating and deflating rotating tires, characterized in that it consists of two parts: a rotating part and a non-rotating part, wherein the rotating part consists of an outer sealing plate (1), an inner sealing plate (5) and a sleeve ( 7), the non-rotating parts are composed of outer cylinder (2), inner cylinder (6), rotating sealing ring (3) and dustproof ring (4), and the outer sealing plate (1) is installed on the sleeve (7) On the end close to the wheel, the inner sealing plate (5) is installed on the end of the sleeve (7) away from the wheel, the inner cylinder (6) is set on the sleeve (7) and is located between the inner sealing plate (5) and the outer sealing Between the plates (1), the outer cylinder (2) is set on the inner cylinder (6) and is located between the inner sealing plate (5) and the outer sealing plate (1), the inner cylinder (6) and the outer cylinder Rotating sealing rings (3) are installed between the cylinders (2) close to the inner sealing plate (5) and the outer sealing plate (1), respectively, and dust-proof seals are installed in the grooves on the two end faces of the outer cylinder (2). Ring (4), the first gas path interface (a) is set on the wall of the outer cylinder (2), the air hole (b) is set on the wall of the inner cylinder, and the second gas path is set on the outer sealing plate interface (c). 2. A device for inflating and deflating rotating tires according to claim 1, characterized in that: the outer ring of the rotating sealing ring (3) is airtightly matched with the inner surface of the outer cylinder (2), and the rotating seal The inner ring of the ring (3) is in airtight fit with the outer surface of the inner cylinder (6), and the working end face of the rotary seal ring (3) is in clearance fit with the inner seal plate (5) and the outer seal plate (1). 3. A device for inflating and deflated rotating tires according to claim 1, characterized in that: the first air circuit interface (a) and the air hole (b) are both located between the two rotating sealing rings (3) s position. 4. A device for inflating and deflated rotating tires according to claim 1, characterized in that: the first air circuit interface (a) is connected to the vehicle air source, and the second air circuit interface (c) is connected to the wheel valve connect.

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