JP2654621B2 - Tire valve core - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire valve core suitable for, for example, checking internal pressure, detecting a temperature inside a tire, or detecting a tire wheel distortion or the like. It is.

[Conventional technology]

As a conventional means for detecting the tire internal pressure (tire air pressure), a detecting means is provided on the tire side to detect the tire internal pressure even while the vehicle is running by applying electromagnetic induction, electromagnetic wave resonance, or the like. What is made known is known. This is called a non-contact method. Further, a method of transmitting the tire internal pressure by a slip ring, a projecting bar, or the like, a method called a so-called contact method is also known. Among them, the non-contact tire pressure detecting means requires a large-scale device and a high cost, and requires, for example, modification of a dedicated wheel or a car. In addition, it is difficult to secure environmental resistance and reliability, and to solve these problems, the cost is further increased. Also,
The display-type tire pressure detection means has been developed as a low-cost means, but if the device is damaged due to its original structure, the tire pressure will be released to the atmosphere, and if the temperature is low in winter, In such a case, an operation failure or the like occurs due to freezing, and therefore, there is a problem in reliability and safety, and it has not reached practical use. In any of the internal pressure detecting means, the tire valve itself is manufactured only for the purpose of smoothly injecting and sealing air, and has a structure according to the purpose for detecting the internal pressure and the temperature inside the tire. Was not turned.

[Problem to be solved]

As described above, various types of tire internal pressure detecting means have been developed, but the tire valve core used therein has not been devised at all, and what is sufficiently satisfactory as a tire internal pressure detecting means has been developed. It has not been developed yet.

Therefore, an object of the present invention is to provide a tire valve core suitable for detecting a tire internal pressure, a temperature in a tire, and the like.

[Means for solving the problem]

In order to achieve the above-described object, the present invention provides a shaft formed of a conductor of a valve core housed in a valve stem as a first conductor, insulated from the first conductor by an insulating portion, A head, a body, a valve packing receiver, a spring, a spring receiver, and a valve stem formed as a second conductor, and a sensor is provided on a tip side of the shaft to be inserted into the tire, and information such as tire internal pressure and temperature is provided. Can be extracted to the outside as an electric signal from the sensor via the first and second conductors.

[Action]

According to the present invention, for example, an insulating coating is applied to the outer surface of the shaft of the component part, and other parts such as a head, a trunk packing receiver, a trunk,
If the valve packing receiver, the spring, and the spring receiver are electrically insulated from each other and used as the second conductor, the shaft becomes the first conductor. Since the first and second conductors are insulated from each other by the insulating portion, a sensor or the like suitable for the purpose is attached to a portion to be inserted into the tire, a tip of a shaft of the valve core, and the like. Are connected to a first conductor and a second conductor, respectively, and a signal line such as an electronic circuit is connected to the first conductor and the second conductor, respectively. It is possible to easily detect information such as the temperature in the inside and the distortion of the wheel.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a valve core 1 is housed inside a valve stem 2, and the valve stem 2 is attached to a wheel 4 by a nut 3. Valve core 1 is shaft 11
The head 12 into which the shaft 11 is inserted is screwed into the inner peripheral surface of the valve stem 2. A trunk 13 is provided below the head 12, and a trunk packing 14 is provided on the outer periphery of the trunk 13 for airtightness between the trunk 13 and the inner peripheral surface of the valve stem 2. The lower end of the body 13 contacts the valve packing 16, and the valve packing 16
And is seated on the valve packing receiver 15. A spring 17 is interposed between the lower surface of the valve packing receiver 15 and the spring receiver 18. The outer peripheral surface of the shaft 11 is coated with an insulating material to form an insulating portion 19. The shaft 11, the head 12, the body 13, the valve packing receiver 15, the spring 17, and the spring receiver 18 are all formed of a conductor, for example, copper or a copper alloy. The trunk 13 and the valve packing receiver 15 are in a non-contact state in the drawing, but the spring receiver 18 and the head 12 are in a conductive state via the valve stem 2 which is a conductor. Thereby, the shaft 11 made of a conductor constitutes the first conductor, and the insulating portion
The head 12 and the torso 1 are insulated from the first conductor (axis 11) by 19
3. The valve packing receiver 15, the spring 17, the spring receiver 18, and the valve stem 2 constitute a second conductor. A sensor 20 is provided at the tip of the shaft 11, and an electrode wire 21 from the sensor 20 is brought into contact with the inner surface of the spring receiver 18 by a spring 22. The reason why the electrode wire 21 is brought into contact with the spring 22 is that the electrode wire 21 also moves along the inner surface of the spring receiver 18 when the top 11A of the shaft 11 is pressed downward. The sensor 20 detects information such as a tire internal pressure and a tire internal temperature, and detects a first conductor (axis 11) and a second conductor (head 1).
2, the body 13, the packing receiver 15, the spring 17, and the spring receiver 18) can be taken out as an electric signal to the outside. Although the valve core 1 seals the air in the tire in the state shown in FIG. 1, when the top 11A of the shaft 11 is pushed down, the shaft 11 pushes down the valve packing 16 and the valve packing receiver 15, As a result, the seal between the body 13 and the valve packing 16 is released, and air in the tire flows into the passage between the shaft 11 and the body 13 and flows out of the gap between the head 12 and the shaft 11 to the outside. Will be done. Similarly, air can be injected into the tire.

An example of processing after extracting information detected by such a sensor 20 as an electric signal via the first conductor and the second conductor will be described with reference to FIG. A case in which the sensor 20 in this case is used as a pressure sensor to check the internal pressure in the tire will be described. An electronic circuit 6 is built in a cap 5 that is screwed into the valve stem 2, and signal lines 7 and 8 of the electronic circuit 6 are respectively connected. The connection is made to the first conductor and the second conductor. Thus, when the cap 5 is placed on the valve stem 2, a signal from the sensor 20 is received by the electronic circuit 6 using the first conductor and the second conductor as lead wires, and the result is processed and displayed. I can do it. The signal line 7 has a clip 9 made of a conductor.
The clip 9 contacts the top 11A of the shaft 11. Since the top portion 11A is not coated with an insulating material, a signal from the sensor 20 can be received by the electronic circuit 6 via the clip 9 and the lead wire 7 using the shaft 11 as the first conductor as a lead wire. Has become. The signal line 8 allows the electronic circuit 6 to receive a signal sent from the sensor 20 via the valve stem 2. Therefore, in this embodiment, the valve stem 2 is also formed of a conductor, and constitutes a second conductor. Capacitor in electronic circuit 6
6A and a coil 6B, and a resonance unit 61 is configured as a whole. The inspection device 30 includes a ring portion 32 having a hole 31 into which the resonance portion 61 is inserted, an oscillation coil 33 provided in the ring portion 32,
And an oscillation unit 34 to which the oscillation coil 33 is connected. The oscillating unit 34 is connected to the signal processing unit 35, and the signal processing unit 35 is connected to the display unit 36. A battery 38 serving as a power source for the lamp 37 and the oscillating unit 34 is housed in a casing 39. The lamp 37 is provided so that the bulb can be seen even in a dark place and the bulb can be inserted into the hole 31 of the ring portion 33. When the detected tire internal pressure is an appropriate value, the display unit 36 turns on blue and emits a comfortable chime sound, and when the detected tire internal pressure is equal to or less than the appropriate value, turns on red and emits a buzzer warning. FIG. 5 is a waveform of an oscillating current representing the oscillation state of the oscillating unit 34, and FIG. It is. A waveform in the figure indicates a state in which the resonance unit 61 and the oscillation unit 34 are separated from each other in position and are not affected by the resonance unit 61. Also, when the resonance section 61 approaches the oscillation coil 33 of the oscillation section 34, the oscillation energy is absorbed by the resonance section 61 and the current in the oscillation section 34 becomes abnormal, and the amplitude of the oscillation current becomes almost zero. It shows the case where it becomes. Such a change in the output signal from the oscillating unit 34 is detected and compared by the signal processing unit 35, and an H level signal is output only for a width corresponding to the symbol B as shown in FIG. Then, the blue lamp of the display unit 36 may be turned on only during the H level shown in FIG. Conversely, if the tire internal pressure is lower than the specified value even when the ring portion 32 of the inspection device 30 is inserted into the resonance portion 61, the sensor 20 remains off and the resonance portion 61 does not form a closed loop. Therefore, even if the ring portion 32 of the inspection device 30 is brought closer to the resonance portion 61, the output of the oscillation portion 34 remains as shown in FIG. 5, and in this case, as shown in FIG. No H level signal is generated. In such a case, the red lamp on the display unit 36 may be turned on to warn that the tire internal pressure has not reached the specified value.

The electronic circuit 6 does not necessarily need to be built in the cap 5, and the electronic circuit 6 may be built in a member attached to the valve stem 2. It is sufficient that the first conductor and the second conductor are electrically insulated by the insulating portion 19. Furthermore, it goes without saying that the present invention can be applied not only to a straight valve as shown in the figure, but also to a bent valve.
Further, it is possible to configure not only the first and second conductors but also third, fourth and higher conductors.

Means for extracting information such as tire pressure and temperature from the inside of the tire wheel to the outside as electrical signals from the first and second conductors using the sensor 20 or the like may be either a contact type or a non-contact type. .

〔effect〕

As described above, according to the present invention, the shaft made of the conductor of the valve core housed in the valve stem is configured as the first conductor, and is insulated from the first conductor by the insulating portion. A head, a body, a valve packing receiver, a spring, a spring receiver, and a valve stem formed as a second conductor, and a sensor is provided on a tip side of the shaft to be inserted into the tire, and information such as tire internal pressure and temperature is provided. Is configured to be able to be extracted to the outside as an electric signal from the sensor via the first and second conductors, so that it is not necessary to perform special processing on the wheel. In addition, it becomes easy to detect the tire internal pressure and the like, and it is also possible to configure various detection devices at low cost. Further, there is no distinction between tube tires and tubeless tires, and mounting can be performed easily. Furthermore,
It can be implemented at low cost without requiring advanced manufacturing technology. That is, when devising the valve stem side, there is a demand for durability and the like, and an advanced manufacturing technique is required. However, for the components constituting the valve core, an insulating material is interposed between the first conductor and the second conductor. Therefore, the present invention can be implemented at low cost. Further, according to the present invention, since it is not necessary to apply special processing to the wheel portion, that is, it can be applied to a normal wheel as it is, and the replacement can be easily performed as in the case of replacing a normal valve core.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention, FIG. 2 is a sectional view of a cap, FIG. 3 is a block diagram showing a configuration example of a tire internal pressure checking device, and FIG. 4 is a perspective view of the checking device. It is. 1 ... valve core, 11 ... shaft, 12 ... head, 13 ... trunk, 15
…… Valve packing receiver, 17 …… Spring, 18 …… Spring receiver, 19
...... Insulation part, 2 ... Valve stem, 20 ... Sensor.

Claims (1)

(57) [Claims] 1. A shaft (11) made of a conductor of a valve core (1) housed inside a valve stem (2) is constituted as a first conductor, and is separated from the first conductor by an insulating portion (19). A head (12), a body (13), a valve packing receiver (15), a spring (17), a spring receiver (18) and a valve stem (2), which are insulated and made of a conductor, are configured as a second conductor; A sensor (20) is provided on the tip side of the shaft (11) to be inserted into the tire, and information such as tire internal pressure and temperature is provided as an electric signal from the sensor (20) via the first and second conductors. A tire valve core that can be taken out.