JPH08332814A - Wheel state detecting device and wheel state detecting wheel - Google Patents

Abstract

PURPOSE: To provide a wheel state detecting device stabilizing the radio wave transmission from a transmitter, facilitating the maintenance of a device such as the replacement of a battery and the adjustment of the transmitter, and resolving the trouble caused when a tire is fitted to or removed from a wheel and to provide a wheel state detecting wheel excellent in rotation balance. CONSTITUTION: This wheel state detecting device 1 detects the information indicating the state of a wheel that a tire 3 is fitted to the wheel and internal pressure is filled into the tire 3, and it is provided with an information detecting sensor, a transmitter 11 transmitting the signal from the sensor as the radio signal, and a power source feeding electric power to them. At least the transmitter 11 is installed at the rotation center portion of the wheel. A wheel removably fitted with a cap 14 storing the transmitter 11 and the power source to a boss section 5 is used for the wheel state detecting device 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a wheel condition detecting device for detecting a wheel condition such as a tire air pressure or a tire temperature while a vehicle is traveling and notifying the driver of the detected wheel condition, and a wheel condition detecting device. Regarding wheels.

[0002]

2. Description of the Related Art Conventionally, a tire internal pressure detecting device has been known as a device for displaying a running state of a wheel in which a tire is mounted on a wheel and filled with internal pressure. As shown in FIG. 3, the tire internal pressure detecting device 100 has an assembly consisting of a pressure sensor, a transmitter and a power source, which is housed in one case, and the case is mounted on the existing wheel 101. The rim portion 102 is placed on the well portion 103 formed in a groove shape in the circumferential direction of the central portion, and the well portion 103 is clamped and fixed by the metal belt 104.

[0003]

However, in the conventional tire internal pressure detecting device 100, when the tire 105 is attached to or detached from the wheel 101, the wheel 10 is set as described above.
No. 1 tire part 103 attached to the well portion 103 (usually height 38 mm × length 140 mm × width 2
(Having a size of 0 mm) becomes a large protrusion to hinder the attachment / detachment work, and if the attachment / detachment work is inadvertently performed, the bead portion 106 of the tire 105 or the attachment / detachment device will be the tire internal pressure detection device. There is a risk of hitting 100 and damaging the detection device 100.

Moreover, since the transmitter as a so-called transmitter for transmitting the signal from the pressure sensor to the outside as a radio wave signal is installed inside the tire, when the radio wave is transmitted to the outside of the tire, it is transmitted to the tire. In addition to being disturbed and the radio field intensity remarkably lowered, the radio field intensity is affected by the size of the tire or wheel, so that stable intensity cannot be transmitted. Furthermore, when the transmitter is installed inside the tire, there is a problem that the intensity and strength of the radio wave reaching the receiver are not stable because the position and orientation of the transmitter change significantly due to the rotation of the tire.

Further, when it becomes necessary to replace the battery serving as a power source or adjust the transmitter, it is necessary to remove the tire from the wheel and attach the tire each time, which makes maintenance of the apparatus complicated. Was becoming.

Further, in the conventional apparatus, an existing wheel is used as a wheel for mounting a tire, and a battery and a transmitter are provided in a part on the circumference of the well portion located at a distance from the center of rotation of the tire. Since a relatively heavy one is fixedly installed, there is a problem that the rotational balance of the wheel is deteriorated.

In view of the above situation, the object of the present invention is to stabilize the transmission of radio waves from a transmitter, facilitate the maintenance of the device such as battery replacement and adjustment of the transmitter, and attach / detach the tire to / from the wheel. (EN) Provided are a wheel condition detecting device for eliminating obstacles in the case and a wheel condition detecting wheel which is excellent in rotation balance.

[0008]

In order to achieve the above-mentioned object, according to the present invention, as described in claim 1, a wheel in which a tire is mounted on a wheel and the tire is filled with internal pressure. Is a wheel state detection device for detecting information representing the state of, the information detection sensor-, a transmitter that transmits a signal from the sensor as a radio signal, and a power supply that supplies power to these, Moreover, at least the transmitter is mounted on the center of rotation of the wheel.

As a wheel applied to the above apparatus, as described in claim 2, a housing in which the transmitter and the power source can be built in a boss portion through which an axle of the wheel is inserted. The wheel state detecting wheel is provided with a detachable cap having a portion.

[0010]

In the wheel condition detecting device according to the present invention, of the information detecting sensor, the transmitter, and the power source, which are the main components of the device, the transmitter and the power source having a relatively large volume are brought out of the tire. When the tire is attached to or detached from the wheel, the wheel condition detector is mounted on the wheel state detecting device by attaching the tire to the center of rotation of the wheel.
The door and tire attachment / detachment device may collide and damage it,
Therefore, it is possible to avoid the trouble that the tire attaching / detaching work itself is difficult to perform. Since the information detection sensor is usually small, even if it is installed inside the tire, it does not particularly disturb the work of attaching and detaching the tire.

In the wheel condition detecting device of the present invention, since the transmitter is always installed outside the tire, the intensity of the radio wave transmitted from the transmitter is weakened by being blocked by the tire as in the conventional device. There is no. Further, since the transmitter is mounted on the center of rotation of the wheel, the distance from the center of rotation of the wheel to the installation position of the transmitter is short, and the position and orientation of the transmitter change due to the rotation of the wheel. Therefore, the fluctuation of the intensity of the transmitted radio wave can be suppressed to be small. Further, even when the size of the tire or the wheel is changed, the position of the transmitter hardly changes, and the change in the radio field intensity due to the change is suppressed.

Further, according to the present invention, by installing a battery as a power source and a transmitter outside the tire,
Maintenance such as battery replacement and transmitter adjustment can be performed easily.

Further, the wheel condition detecting wheel according to the present invention.
In the vehicle, a cap having a storage portion for storing a battery as a power source and a transmitter is detachably attached to a boss portion through which the axle of the wheel is inserted. In assembling the device, after mounting the tire on the wheel in advance, the cap is attached to the boss portion, and the transmitter and the battery built in the cap are installed on the wheel side to detect the information. Sensor
After connecting the inner pressure detecting device to the well portion of the existing wheel as in the conventional device, the tire is mounted and the tire bead portion and the tire attaching / detaching device are collided with the device, and the device is connected to the device. It does not cause any problems that may damage the Further, even when the tire is removed from the wheel, the work can be performed by a conventional method as long as the cap is removed from the boss portion in advance, and there is concern that the device installed in the tire like a conventional device may be damaged. Then, you will be freed from the trouble of working with special consideration. Furthermore, in the device according to the invention, a relatively heavy battery and transmitter
Since it is installed near the center of rotation of the battery, the rotational unbalanced moment due to the battery and the transmitter can be suppressed to be small.

[0014]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a side view (a) when a tire 3 is mounted on a wheel condition detecting wheel 2 applied to a wheel condition detecting device 1 according to a first embodiment of the present invention and a in the side view.
It is a sectional view (b) taken along the line a.

In FIG. 1 (a), a wheel condition detecting wheel 2 includes a rim 4 and a boss portion 5 through which an axle of a vehicle is inserted.
And a spoke 6 for connecting the rim 4 and the boss portion 5,
The cap 14 described later is the main constituent element. Then, as shown in the sectional view of FIG.
One of them has a hollow inside and is provided with a communication passage 7 so that the gas filled in the tire is filled with the well portion 8 of the rim 4.
Introduced from the opening 9 provided at one place on the bottom of the
Through the communication passage 7, the pressure sensor 10 as an information detection sensor installed at the inner end portion of the communication passage 7, that is, the outer peripheral end portion of the boss portion 5 is reached. On the other hand, a housing 13 for housing a transmitter 11 and a battery 12 serving as a power source is provided, and furthermore, fitting type spring legs 15 are provided at four places on the bottom so that corresponding fastening holes 16 of the boss portion 5 are provided.
A resin cap 14 configured to be detachable is separately prepared.

The cap 14 accommodating the transmitter 11 and the battery 12 in the accommodating portion 13 is attached to the boss portion 5, and the terminal of the pressure sensor 10 and the transmitter 1 are attached.
The wheel state detection device 1 is configured by connecting the battery 1 and the battery 12 with the electric wire 17.

Next, the operation in this embodiment will be described using the wheel state detecting device 1 and the wheel state detecting wheel 2 configured as described above. A predetermined tire 3 is mounted on the wheel condition detecting wheel 2 according to the present invention in which the pressure sensor 10 is attached to the boss portion 5, and the inside of the tire is filled with a prescribed internal pressure. The wheels on which the tire 3 is mounted on the wheel 2 are mounted on all the wheels of a general passenger car. Next, the cap 14 having the transmitter 11 and the battery 12 built in the storage portion 13
Is attached to the boss portion 5 of the wheel 2 of all wheels, and the terminal of the pressure sensor 10 and the transmitter 11 are attached to each wheel.
The electric field 17 communicates with the battery 12 to assemble the wheel state detecting device 1 for each wheel.

Then, a receiving device (not shown) is arranged at a predetermined position of the passenger car, and by this, the signal indicating the fluctuation state of the tire internal pressure transmitted from the transmitter 11 of each wheel is received and compared with the reference value. The result is displayed above on a display device (eg, a lamp) in the driver's seat.

In the first embodiment, since the transmitter and the battery are attached to the outside of the tire and to the boss portion near the center of rotation of the wheel, the intensity of the signal radio wave from the transmitter is prevented from being lowered, and in addition the radio wave is transmitted. The effect of wheel rotation on strength is minimized. Further, the wheel condition detecting device is not damaged when the tire is attached or detached, and the tire can be easily attached and detached. Furthermore, maintenance such as battery replacement and transmitter adjustment is facilitated, and there is an advantage that rotational imbalance due to the device is unlikely to occur.

Next, a second embodiment according to the present invention will be described.
FIG. 2 is a side view (a) when the tire 3 is mounted on the wheel condition detecting wheel 18 applied to the wheel condition detecting device 1 according to the second embodiment of the present invention and a in the side view. It is a sectional view (b) taken along the line a. In FIG. 2 (a), the wheel state detecting wheel 18 has almost the same structure as the wheel 2 of the first embodiment, except that the spoke 6 is solid. In this embodiment, the pressure sensor 10 for detecting the filling internal pressure in the tire is installed in the well portion 8 of the rim 4. Then, as in the first embodiment, the resin cap 14 accommodating the transmitter 11 and the battery 12 is attached to the boss portion 5, and the pressure sensor 10 and the transmitter 11 and the battery 12 are connected to the boss portion 5. Sealing perforations 20 provided in a part of the electric wire 17 and the rim through a connector-19 installed at the outer peripheral end of the
The wheel state detection device 1 is configured by being connected by the electric wires 21 that penetrate through the tire and are drawn out of the tire.

Next, the operation of this embodiment will be described using the wheel state detecting device 1 and the wheel state detecting wheel 18 configured as described above. The tire 3 is mounted on the wheel state detecting wheel 18 and filled with a prescribed internal pressure.
Next, the cap 14 is attached to the boss portion 5 and the electric wire 17 is attached.
Is connected to the connector-19. That is, the electric wire 17 connected to the transmitter 11 and the battery 12 is connected to the electric wire 21 connected to the pressure sensor via the connector 19 to form the wheel state detection device 1. Thus, the pressure fluctuation of the gas in the tire is received as a transmission signal from the transmitter 11 by the receiver installed in the passenger car, collated with the reference value, and displayed on the display device in the driver's seat.

In the second embodiment, the pressure sensor 10 is incorporated in the tire 3, but the normal pressure sensor is extremely small, so that it does not hinder the attachment / detachment of the tire 3 to / from the wheel 18, and the others. Configuration and operation of the first embodiment
Since it is almost the same as the above, it is possible to obtain the same effect as that of the first embodiment.

In each of the above embodiments, the pressure sensor is used as the information detecting sensor, but it is used as various temperature sensors including the existing one for detecting the temperature of the gas filled in the tire. You can

[0024]

By adopting the wheel condition detecting device and the wheel condition detecting wheel according to the present invention, electric signals representing the wheel condition such as the tire internal pressure and the tire internal temperature are stably taken out and displayed on the driver's seat. To be done. Moreover, when the tire is attached to or detached from the wheel, the possibility of damaging the detection device is eliminated, and the tire is easily attached and detached. Further, maintenance of the device such as battery replacement and adjustment of the transmitter becomes easy. In particular, the present invention provides a wheel condition detecting wheel having excellent rotation balance.

[Brief description of drawings]

FIG. 1 (a) is a side view when a tire is mounted on a wheel condition detection wheel according to the first embodiment. (B) The aa line sectional view in the said side view (a).

FIG. 2 (a) is a side view when a tire is mounted on a wheel condition detection wheel according to the second embodiment. (B) The aa line sectional view in the said side view (a).

FIG. 3 is a view showing a conventional wheel state detecting device and a wheel.

[Explanation of symbols]

 1 Wheel State Detection Device 2 Wheel State Detection Wheel (of Example 1) 3 Tire 4 Rim 5 Boss 6 Spoke 7 Communication Passage 8 Well 9 Opening 10 Pressure Sensor-11 Transmitter 12 Battery 13 Storage Part 14 Cap 15 Spring leg 16 Fastening hole 17 Electric wire 18 Wheel state detection wheel (of Example 2) 19 Connector 20 Perforation 21 Electric wire

Claims (2)

[Claims] 1. A wheel condition detecting device for mounting a tire on a wheel to detect information representing a condition of a wheel in which internal pressure is filled in the tire, comprising: an information detecting sensor; and a sensor from the sensor. A wheel condition detecting device having a transmitter for transmitting a signal as a radio signal and a power supply for supplying electric power to the transmitter, and at least the transmitter is installed at a center of rotation of the wheel. . 2. A wheel condition detecting wheel having a detachable cap having a storage portion capable of accommodating the transmitter and the power source, provided on a boss portion through which an axle of the wheel is inserted.