JPS585234Y2 - Kuukitire youkuukiatsukenchiki - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air pressure detector that automatically detects abnormalities in air pressure in pneumatic tires of automobiles, etc., and the device is screwed onto the outer end of the existing air valve outer cylinder of the pneumatic tire. Supplying air to pneumatic tires by simply installing it and without removing it.
The purpose of this invention is to provide a novel structure that can perform drainage.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a housing, on the upper side there is an air inlet 2 which is usually closed with a cap C, and on the lower side there is an outer end of the air valve outer cylinder of the pneumatic tire. A connecting port 3 to which the holder can be directly screwed is formed, and first and second pressure receiving chambers 4 and 5 communicating with the above-mentioned ports 2 and 3 are formed on both the left and right sides, respectively.

The communication hole 6 between the air inlet 2 and the connection port 3 supports an operating rod 8 which is constantly pushed upward by a spring 7 so as to be able to rise and fall freely, and the upper limit of the upward movement of the operating rod 8 is integrally located in the middle part. The shaped valve body 8a is regulated by coming into contact with the lower surface of the valve seat member 9 screwed onto the air inlet 2.

The valve seat member 9 is provided with an air hole 10 that opens and closes as the valve element 8a moves up and down, and a seal member 8b is provided on the upper surface of the valve element 8a.
is glued.

In addition, the operating rod 8 has a length that allows its upper end to face the opening end of the air inlet 2 at its upper limit, and to push down the valve rod Va in the air valve outer cylinder ■ which is screwed into the connection port 3 with its lower end. have.

A diaphragm 1 is provided on the outside of the first and second pressure receiving chambers 4 and 5.
1 and 12 between the first and second switch chambers 13 and 14
and a fixed contact 15 in the first switch chamber 13.
a, and a movable contact 15b operated by the diaphragm 11.
The low pressure switch 15 is constructed by facing the same, and fixed and movable contacts 16a, 16 are also provided in the second switch chamber 14.
The high voltage switch 16 is configured by facing b.

The low pressure switch 15 is closed by the curvature of the diaphragm 11 when a pressure equal to or higher than the specified lower limit air pressure of the pneumatic tire is applied to the first pressure receiving chamber 4, and the high pressure switch 16 is closed when the pressure of the pneumatic tire is applied to the second pressure receiving chamber 5. When a pressure exceeding the specified upper limit air pressure is applied, the diaphragm 12 is bent to close, and when the low pressure switch 15 is opened, the low pressure alarm 1 installed on the instrument panel of the vehicle is activated.
7, and when the high pressure switch 16 is closed, a high pressure alarm 18 on the same instrument panel is activated.

Next, the operation of this embodiment will be explained.

When the outer end of the air valve outer cylinder (■) of a pneumatic tire is attached to the connection port 3 of the housing 1, the valve rod (a) inside the outer cylinder is pressed down by the operating rod (8), and the air valve (not shown) is opened. Both pressure receiving chambers 4, 5 have the same pressure as the inside of the pneumatic tire.

At this time, the valve body 8a is pressed against the lower surface of the valve seat member 9 to close the air hole 10, so that even if the cap C is removed, the internal air will not leak out.

Now, if the pressure in both pressure receiving chambers 4 and 5 is within the range of the tire air pressure predetermined and lower limit value, the pressure in the first pressure receiving chamber 4 causes the low pressure switch 15 to be activated via the diaphragm 11 as shown in the figure. is closed, while the high pressure switch 16 remains open, so both alarms 17,18 remain inactive, indicating that there is no abnormality in the air pressure.

However, if for some reason the tire air pressure drops to the specified lower limit, the pressure in both pressure receiving chambers 4 and 5 will also drop at the same time, and the low pressure switch 15 will automatically open and send a signal to the low pressure alarm 17. , so the pilot can immediately detect an abnormal drop in air pressure.

In addition, when the pressure rises above the specified upper limit, both pressure receiving chambers 4
, 5 also rises at the same time, and the pressure in the second pressure receiving chamber 5 opens the high pressure switch 16 via the diaphragm 12 and sends an activation signal to the high pressure alarm 18, so the operator can detect an abnormal increase in air pressure. It can be detected in the same way.

To fill the tire with air, remove the cap C and apply an air supply mouthpiece (not shown) connected to the compressed air source to the air inlet 2, as is conventionally done, and the air supply mouth is operated by the air supply mouthpiece. The rod 8 is pushed down against the spring 7, and accordingly the valve body 8
a is separated from the valve seat member 9, compressed air flows through the air hole 1.
0, and is filled into the tire through the air valve, which is already open due to the lowering of the valve lever.

If the compressed air is overfilled, simply pressing down on the upper end of the operating rod 8 with your fingertip will lower the air pressure by lowering the valve body 8a.
0 opens, allowing the air inside the tire to be properly discharged to the outside.

In addition, when the connection port 3 of the device housing 1 is removed from the air valve outer cylinder V of the pneumatic tire for inspection and maintenance, etc., the valve rod ■a in the outer cylinder ■ that had been pressed down by the operating rod 8 until then is removed. but,
Since the air valve is automatically closed when the housing 1 is removed and the air valve is automatically closed, there is no need to worry about the air inside the tire escaping to the outside.

As described above, according to the present invention, an air inlet 2 is provided on the upper side of a single housing 1, and a connecting port 3 to which the outer end of the air valve outer cylinder V of a pneumatic tire can be directly screwed is further provided on the lower side. First and second pressure receiving chambers 4 and 5 are formed on the sides and communicate with the air inlet 2 and the connection port 3, respectively, and engage with a valve seat provided in the air inlet 2 in the raised position and lower. The valve body 8a is provided with a valve body 8a that is spaced apart at the position, and the spring 7
An operating rod 8 that is always urged upward is supported in the communication hole 6 between the air inlet 2 and the connection port 3 so as to be able to rise and fall freely, and when the operating rod 8 is in the raised position, its upper end is connected to the air inlet. 2, and its lower end can push down the valve lever ``a'' in the air valve outer cylinder ``,'' which is screwed into the connection port 3, and outside the first pressure receiving chamber 4, A low pressure switch 15 is installed outside the second pressure receiving chamber 5 to activate a low pressure alarm 17 in response to the pressure within the pressure receiving chamber 4 falling below a predetermined lower limit air pressure. When the air pressure exceeds a predetermined upper limit, the high pressure alarm 18 is activated in response.
Since a high pressure switch 16 that can operate the
By simply screwing the connection port 3 of the housing 1 into the air valve outer cylinder (■) of a general pneumatic tire, the valve rod (a) inside the outer cylinder (■) is automatically pushed down by the operating rod 8, and the When the air valve is opened, the inside of both pressure receiving chambers 4.5 can be made equal to the pressure inside the pneumatic tire, and in this state, the low pressure and high pressure switches 15 and 16 can be used to prevent abnormal decreases and increases in tire air pressure. Can be detected reliably and automatically.

In addition, by simply applying an air supply mouthpiece connected to a compressed air source to the air inlet 2, the operating rod 8 is depressed and the valve body 8 is pressed down.
By lowering a, the air inlet 2 can be opened, so that compressed air can be filled into the tire through the air inlet 2 and the air valve without any problem.

Furthermore, when the connection port 3 of the device housing 1 is removed from the air valve outer cylinder (■) for inspection and maintenance etc., the air valve valve rod (a), which had been pressed down by the operating rod (8), is raised and returned to its original position. The air valve can be automatically closed, and there is no need to worry about the air inside the tire escaping to the outside.
In the work of attaching and removing the air valve from the outer cylinder V of the air valve, the trouble of refilling the tire with air is completely omitted, and the work efficiency can be greatly improved.

The air pressure sensor of the present invention has the air inlet 2, the connection port 3, and the first... Since the second pressure receiving chambers 4 and 5 are formed and all the constituent members such as the operating rod 8 are housed inside the housing 1, the overall structure is simple and can be provided at low cost. Moreover, since a compact shape is obtained, the appearance of the tire wheel is not impaired, and damage accidents due to collision with other objects can be avoided as much as possible.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of an embodiment of the present invention. 1 is the housing, 2 is the air inlet, 3 is the connection port, 4 and 5 are the first
and a second pressure receiving chamber, 6 is a communication hole, 8 is an operating rod, 8a is a valve body, 9 is a valve seat member having a valve seat, 15 and 16 are low pressure and high pressure switches, 17 and 18 are low pressure and high pressure alarms, ■ is the air valve outer cylinder, and ■a is the valve rod.

Claims (1)

[Scope of utility model registration request] □ An air inlet 2 on the upper side of the single housing 1, an air valve outer cylinder of a pneumatic tire on the lower side □ A connecting port 3 that can be directly screwed onto the outer end, and furthermore, on the side, the air inlet 2 and A valve body 8a is provided, which has first and second pressure receiving chambers 4 and 5 communicating with the connection port 3, respectively, and engages with a valve seat provided in the air inlet 2 in a raised position and separates in a lowered position. , and an operating rod 8, which is always urged upward by a spring 7, is supported in the communication hole 6 between the air inlet 2 and the connection port 3 so as to be able to rise and fall freely, and furthermore, when the operating rod 8 is in the raised position, its upper end is The first pressure receiving chamber 4 is arranged so as to face near the opening end of the air inlet 2 and to be able to push down the valve lever ■a in the air valve outer cylinder ■ which is screwed into the connection port 3 by its lower end. A low pressure switch 15 is provided on the outside of the second pressure receiving chamber 5, and a low pressure switch 15 is provided on the outside of the second pressure receiving chamber 5. , a high pressure switch 1 capable of activating a high pressure alarm 18 in response to a predetermined upper limit air pressure or more in the pressure receiving chamber 5;
An air pressure detector for pneumatic tires, each equipped with 6.