JPH01172003A - Air pressure supplementary device for tire - Google Patents

Abstract

PURPOSE:To enable constant supplementation of tire air pressure by providing an air valve, which opens when a pressure inside an tire air chamber becomes below the preset value, between an accumulator and the tire air chamber, and enabling the supply of air pressure into the accumulator by an air pump. CONSTITUTION:A slant cam 13 is installed on a shaft 5. A piston 17, which has steel balls 16 to roll on the peripheral portion of the slant cam 13, is fitted in the pipe portion 15 of cast wheel 6. This piston 17 is energized in the direction of the slant cam 13 by the force of a spring 18. An accumulator 21 is formed between the tip of pipe section 15 and filter case 20, thus an air pump is constructed. When the tire air pressure reaches below the preset value, an air valve 24 opens against the spring force, and the high-pressure air in the accumulator 21 is supplied to an air chamber 7a through an air passage 23. On the other hand, when the tire air pressure reaches the preset value, the air valve 35 of a back pressure passage 30 opens to keep the air pressure inside the accumulator 21 constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tire air pressure compensation device that is capable of constantly supplementing tire air pressure.

(Prior Art) In order to maintain good running performance of a vehicle, it is desirable that tire air pressure is always maintained at a set value.

Conventionally, in order to maintain the air pressure of such tires at a set value, it is necessary to perform periodic inspections and replenish the air pressure as necessary, or to attach an air pressure detection device to the tire and check the detection results of the detection device. Depending on the situation, the necessary air pressure is replenished.

(Problem to be Solved by the Invention) However, in the former case, if periodic inspection is neglected, or if the air pressure decreases for some reason before the inspection time, In the latter case, even if a detection signal is given from the detection device, the tire pressure will not be sufficient until the tire is refilled. This is undesirable because a situation may arise in which the amount of water is insufficient.

Further, in the latter case, although the air pressure inspection work required for the former can be omitted, the air pressure compensation is not automatically performed, making the work cumbersome.

Therefore, the present invention was made in order to solve such conventional problems, and its purpose is to provide a tire air pressure compensation device that can constantly compensate for weak air pressure in tires while driving. It is in.

(Means and effects for solving the problems) In order to solve the above problems, the present invention provides a pressure accumulation chamber 21 and a tire air chamber 7.
A first air valve 24 is provided between the pressure accumulation chamber 21 and the tire air chamber 7a, which communicates the two chambers 21.7a when the pressure in the pressure accumulation chamber 21 becomes higher than the pressure in the tire air chamber 7a by a first set value or more. A second air pulp 35 is provided to release the pressure in the pressure accumulation chamber 21 to the outside air when the pressure in the chamber 21 exceeds a second set value, and the rotational motion of the cast wheel 6 is changed to a reciprocating motion parallel to the axle shaft 5. The inclined cam 13 to be converted is connected to the axle shaft 5 to form an air pump, and air pressure is supplied to the pressure accumulation chamber 21 by the air pump.

According to such a configuration, when the tire air pressure falls below the set value, the air pressure is compensated through the first air valve until it reaches the set value, and the tire air pressure is always maintained at a constant set value. becomes possible.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is an overall view showing a two-wheeled vehicle according to an embodiment of the present invention;
FIG. 2 is a partially detailed view showing a front wheel to which the present invention is applied, and FIGS. 3 to 7 are detailed views of main parts.

In the two-wheeled vehicle l shown in Fig. 81, 2 indicates the front wheel, 3 indicates the rear wheel, 4 indicates the front fork, 5 indicates the axle shaft,
6 indicates a cast wheel, 7 indicates a tire, and 8 indicates a disc brake.

As shown in FIG. 3, the axle shaft 5 has a bracket 4b fastened to the bottom case 4a of the front fork 4, and a recess 4c formed in the bottom case 4a and the bracket 4b, respectively.

Both ends 5a are fixed to the support section 4d.

The cast wheel 6 has a hub plate 9 screwed and fixed to its side, and bearings 1 interposed on the left and right between the hub plate 9 and the axle shaft 5.
It is rotatably supported by an axle shaft 5 by oil seals 11 and 11, and a tubeless tire 7 is held on its outer periphery.

Incidentally, a portion 5b of the axle shaft 5 is serrated, and the inclined cam 13 is serrated and fixed to the serrated portion.

On the other hand, a cylindrical tube portion 15 is formed near the center of the cast wheel 6, and the inclined cam 1 is attached to the tube portion 15.
A piston 17 equipped with a steel pole 16 that contacts while rolling near the periphery of the return spring 18
It is slidably provided while being biased in the direction of the inclined cam 13 by. The return spring 18 is provided with an inner circlip 19 to prevent removal, and an O-ring 17a is provided near the tip of the piston 17.

As shown in FIG. 4, a pressure accumulator 21 is provided at the tip of the cylindrical portion 15 and is a sealed space between it and the filter case 20.
An air passage 23 is formed between the pressure accumulation chamber 21 and the air chamber 7a of the tubeless tire 7 to communicate with the air chamber 7a.
is formed in the air passage 23, and an air valve 2 that communicates with the passage 23 when the pressure in the pressure accumulation chamber 21 becomes higher than the pressure in the tire air chamber 7a by a set value (first set value) or more.
4 is provided.

This air valve 24 is constructed by inserting a return spring 25 and a steel pole 26 into an air passage 23 formed in the cast wheel 6, press-fitting a tapered member 27, and forcing the steel pole 26 into contact with the tapered member 27. The tapered surface 27a and the ball 28 form a sealing structure when they come into contact with each other.

On the other hand, as shown in FIGS. 4 and 85, between the pressure accumulation chamber 21 and the outside air, there are first and second back pressure passages 30 and 31 for exhaust pressure that communicate the pressure accumulation chamber 21 with the outside air; Outside air is transferred to pressure storage chamber 2
A supply passage 32 for supplying outside air to the air conditioner 1 is formed.

The 1.82nd back pressure passage 30.31 is connected to the first exhaust pressure passage 30 in the pressure accumulator case 20 when the pressure in the pressure accumulator 21 becomes higher than a predetermined value (second set value) with respect to the outside pressure. To,
An air valve 35 is provided to communicate the pressure accumulation chamber 21 with the outside air, and the second exhaust pressure passage 31 is provided with an air valve 35 that communicates with the outside air. An air valve 36 is provided for emergency evacuation to be released.

Both of these air valves 35 and 36 have the same configuration as the air valve 24 described above, and have tapered members 37 and 36, respectively.
8. The spring constant of the return spring 41, which is composed of steel poles 39, 40 and return springs 41 and 42 and is provided in the first exhaust pressure passage 30, is 2. The spring constant is 2, which is provided in the air passage 23 to the tire air chamber described above. The spring constant of the spring 25 is set higher than 1, and the spring constant 3 of the return spring 42 provided in the second exhaust pressure passage 31 is further set higher than 2.

A one-sided reed valve 45 is provided in the outside air supply passage 32 . As shown in FIG. 5, the reed valve 45 is press-fitted and fixed to the cast wheel 6 side together with the filter case 20, and a hole 2 for a supply passage is provided in the filter case 20 to be surrounded by the filter 22.
0b is arranged so as to be closed by a reed valve portion 45a.

According to such a reed valve 45, as shown in FIG. 6, air in the direction of arrow A does not pass through, but air in the direction of arrow B passes through, thereby ensuring unidirectionality.

Note that the hole 45b formed in the reed valve 45 and filter case 20 shown in FIG.

45c and 20b, 20c are the first exhaust pressure passages 30. This hole is for forming the second exhaust pressure passage 31.

In the above configuration, the inclined cam 13, the steel pole 1
6. The piston 17, the pressure accumulation chamber 21, the reed valve 45, etc. constitute an air pump. Therefore, according to this configuration, when the tire air pressure falls below the set value, the air valve 35 is activated against the drag force of the return spring 25. The air chamber 7a is opened and air is supplied to the air chamber 7a until the tire air pressure reaches the set value.

On the other hand, when the tire air pressure is at the set value, if the pressure in the pressure accumulation chamber 21 becomes higher than the pressure value determined by the tire air pressure and the biasing force of the return spring 25, the air valve in the exhaust pressure passage , or
This valve 30 and the emergency exhaust pressure air valve 36 are both opened to maintain the air pressure in the pressure accumulator 21 constant, and to prevent the air pressure from being supplied to the tire above a set value.

(Effects of the Invention) As is clear from the above explanation, according to the present invention,
When the tire air pressure falls below the set value, the pump installed inside the wheel can automatically replenish the air pressure to the set value, making it possible to always drive under the best conditions and further improving the tire pressure. It is possible to provide a tire air pressure compensation device that can extend the maintenance intervals such as the above, and can also save a lot of troublesome effort.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing a two-wheeled vehicle according to an embodiment of the present invention;
FIG. 2 is a partially detailed view showing a front wheel to which the present invention is applied, and FIGS. 3 to 7 are detailed views of main parts. In the drawings, 5 is an axle shaft, 6 is a cast wheel, 7 is a tire, 7a is a tire air chamber, 13 is an inclined cam, 21 is a pressure accumulation chamber, 24 is a first air valve, 35 is a second air valve, Figure 4 Figure 5! , 5b 45bi

Claims (1)

[Claims] Between a pressure accumulation chamber and a tire air chamber, when the pressure in the pressure accumulation chamber becomes higher than the pressure in the tire air chamber by a first set value or more,
A first air valve is provided to communicate these two chambers, and a second air valve is provided to release the pressure in the pressure accumulation chamber to the outside air when the pressure in the pressure accumulation chamber exceeds a second set value. A tire air pressure compensating device characterized in that an air pump whose power source is the relative rotational movement of a shaft is formed, and the air pump supplies air pressure to the pressure accumulating chamber. (2) The tire according to claim 1, wherein the air pump is formed by connecting to the axle shaft an inclined cam that converts the rotational motion of the cast wheel into reciprocating motion parallel to the axle shaft. air pressure compensation device.