RU2106978C1 - Pneumatic tyre with automatic inflating device - Google Patents

Abstract

FIELD: transport engineering. SUBSTANCE: pipe of peristaltic pump connected with atmosphere through pressure limiter at one side and terminating in valve in tyre inflated space at other side is placed in tyre casing over its circumference or in wall of tube also over its circumference. EFFECT: enlarged operating capabilities. 3 dwg

Description

 The invention relates to the field of transport and can be used on all types of transport using pneumatic tires.

 It is known that pneumatic tires during operation are periodically checked for pressure and, if necessary, pumped up with various pumps and compressors.

 Previously, pneumatic tires with automatic pumping of air by pumps installed in the wheel were offered, for example, UK patent 1457404, class. B 60 C 23/12, 1975 or a peristaltic pump (U.S. Patent No. 5052456 B 60 C 23/12, 1991). The peristaltic pump of the US patent, consisting of a flexible hose mounted on the rim, as well as rollers, pushers, cams, electromagnetic exciters, etc., only about 70 parts located partially on the rim of the wheel, partially on the vehicle body, have a complex mechanical construction, makes the wheel heavier, increases the cost of energy for the rotation of the wheel and, apparently, therefore does not find practical application in transport.

 It is proposed to integrate a peristaltic pump into the pneumatic tire design for automatic pumping-pneumatic tires and maintaining optimal pressure in it. In general, this pump can be a tube (hose) with elastic walls located on the outer surface of the tire. The beginning of this tube is connected with the atmosphere, and the end through the valve goes into the inflated space of the tire. In place of tire contact with the road surface, the tube is compressed under the weight of the vehicle. The place of compression of the tube during the translational-rotational movement of the wheel moves along the length of the tube and squeezes air through the valve into the inflated space of the tire, and on the other hand draws in atmospheric air into the cavity of the tube. In order to maintain optimal pressure in the described pneumatic tire, it is necessary that atmospheric air enters the pump cavity through a pressure limiter. A simple pressure limiter can be the initial part of the tube of the peristaltic pump, if it is passed through the inflated tire cavity and in this part the walls of the tube are given the specified rigidity. Then, when the specified tire pressure is reached, the tube walls will close and the intake of atmospheric air into the pump cavity will stop.

 In the actual embodiment of the described embodiment of the pump, a problem of wear resistance of the material for the pump tube may occur. The problem is solved by placing the tube or pump cavity in the body of the tire, for example, under the tread or on the wall of the chamber. In this case, it is necessary to modify the design of the tire so that compression of the pump cavity at the point of contact of the tire with the road is ensured.

 In FIG. 1 shows a longitudinal section of a tubeless pneumatic tire with automatic pumping of air along its largest circumference; in FIG. 2 shows a fragment of a cross-section of a tubeless pneumatic tire with one of the options for placing a cross-section of a tubeless pneumatic tire with one of the options for placing the cavity of the peristaltic pump in the tire body; figure 3 shows a fragment of a cross section of a pneumatic tire with a chamber with an example of the placement of the pump cavity on the wall of the chamber.

 A pneumatic tire with automatic air pumping (see FIG. 1) has 1 cavity (tube) 2 in the tire body located around the tire circumference. The beginning of the cavity 2 is connected through a tube 3 with atmospheric air. The other end of this cavity exits through the valve 4 into the inflated space 5. Between the tube 3 and the valve 4, the cavity 2 is plugged by a partition 6. The cavity 2 is crushed at the point of contact of the tire with the road surface. The compression site of the cavity 2 during the translational-rotational movement of the wheel in the direction of the arrow 7 moves towards the valve 4 and squeezes air through it into the inflated tire space. At the same time, on the other hand, through the tube 3, atmospheric air is sucked into the cavity 2. Thus, the cavity 2 together with the tube 3, valve 4 forms a pump operating according to the peristaltic principle. In order for the tire inflation to stop when the optimum pressure is reached, the walls of the tube 3 are given the specified rigidity, i.e. its walls are crushed at a certain pressure in the tire and block the access of air into the pump cavity. In other words, tube 3 is a pressure limiter. The valve 4 for the device is completely similar to the valves used in inflatable rubber boats, made in the form of a rubber tube, crushed by air pressure in the tire.

 In FIG. 2 shows a tubeless tire 1 with an arrangement of a cavity 2 formed in a tire body under a tread. To reliably compress the cavity 2 when the tire comes into contact with the road, part 3 (darkened in FIG.) Is made of a softer material than the rest of the tire.

 In FIG. 3 shows a pneumatic tire 1 with a variant of the location of the cavity 2 of the peristaltic pump in the chamber 3.

 In order to better compress the cavity 2 upon contact of the tire with the road, part of the wall of the chamber 4 (darkened in FIG.) Is made of inextensible material.

Claims (1)

 Pneumatic tire with automatic air inflation, with a peristaltic pump built into the wheel design, made in the form of a tube along the circumference of the tire, connected to the atmosphere through a pressure limiter on one side and ending with a valve in the inflated tire space on the other hand, characterized in that the peristaltic pump tube located in the body of the tire around its circumference or on the wall of the chamber along its circumference.

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