JP2003159919A - Casing structure of transmitter for tire pneumatic pressure warning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To conduct a tire replacing work without removing a transmitter for a tire pneumatic pressure warning device. <P>SOLUTION: The casing structure of the transmitter 1 for the tire pneumatic pressure warning device comprises a pressure sensor for sensing the tire pneumatic pressure, a signal processing circuit, an electronic board, a battery and the like contained in a rectangular casing 2, a tire valve 3 protruding rearward and integrally provided at the upper part of the casing 2. In the structure, the forward corner part of the casing 2 is formed in an R shape, the wall surface 2a of the corner part is formed with a skirt part 10 with a taper angle θ<SB>2</SB>=65 to 75°, and the part between both ends of the skirt part 10 and the wall surface 2a is formed of a suitable curve of R shape from the upper surface of the casing toward the bottom. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing structure of a transmitter for a tire air pressure alarm device for detecting an abnormality in tire air pressure and giving an alarm to a driver in a vehicle compartment, and more particularly to an electronic board on which a microcomputer or the like is integrated. By increasing the rigidity of the casing that houses the battery, which is the power supply for operating it, and making it easy to ride the tire beads when changing tires, it is possible to remove the transmitter for the tire pressure alarm device. The present invention relates to a casing structure of a transmitter for a tire pressure warning device, which enables tire replacement work.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional transmitter 1 for transmitting tire pressure information to a receiver (not shown) provided in a vehicle compartment, as disclosed in Japanese Patent Laid-Open No. 2000-81358. FIG. 2 is an external perspective view showing the transmitter 1
Is integrally provided with a casing 2 and a tire valve 3 formed in a rectangular box shape, and the casing 2 accommodates a pressure detection unit, a signal processing circuit, an electronic board, a battery, etc., which are not shown. . In addition, the air injected from the tire valve 3 has a vent hole 4 formed in a thick wall portion above the casing 2.
More can be injected into the tire. And
The transmitter 1 is attached to a very small space of the wheel, as shown in the transmitter housing sectional view of FIG. Therefore, the electronic board housed in the casing 2 has poor radio wave characteristics if it is too close to the wheel, so the electronic board is housed in the casing so that the electronic board is located as far as possible from the wheel.

The casing 2 has a flange 5 extending outward from the bottom and a plurality of triangular reinforcing ribs 6 provided between the flange 5 and the outer wall surface of the casing 2. As shown in FIG. 7, the rib 6 has a taper angle θ on the outer peripheral portion of the casing as described below.

A mechanical model for obtaining the taper angle of the reinforcing rib shown in FIG. 7 will be described below. FIG. 10 is an external perspective view of a general tire attaching / detaching machine, in which wheels are rotated with the tire fixed. FIG. 11 is a process diagram showing the locus of the tire bead when the tire is removed. When disassembling the tire removing work, the tire bead 7 gets on the transmitter from about 60 ° to 45 ° around the ventilation hole 4 of the transmitter 1. (FIG. 11) In addition, the reinforcing rib 6 of the transmitter on which the tire bead 7 rides
The taper angle of is from the model of FIG. 12 when the tire bead 7 slides up the casing slope, the bending moment M applied to the fixed end of the transmitter is M = Q (cos θ-μ sin θ) ×
sin θ × L.

FIG. 13 is a relational diagram in which the taper angle of the reinforcing rib is obtained, and the allowable maximum value of the taper angle is obtained from the relation between the moment and the taper angle in FIG. Further, the most suitable taper angle can be obtained from the rim shape. From the above, the outer peripheral reinforcing ribs 6 of the transmitter 1 in the conventional tire pressure alarm device ride on the tire beads 7 (transmitter position 60 ° to 45 °) at the time of tire removal, so that in the conventional casing, as shown in FIG. Also, the taper angle θ of the reinforcing rib 6 shown in FIG. 11 is set to a value within the range of 60 ° to 45 °.

[0006]

The casing 2 of the transmitter 1 configured as described above has a flange 5 and a reinforcing rib 6.
Therefore, it is possible to sufficiently withstand the contact or pressing of the tire bead 7, and especially when the tire is removed, the tire bead easily rides on the casing side surface or the upper surface to prevent an excessive force from acting on the casing. . However, depending on the shape of the wheel, a large gap is generated between the bottom surface of the transmitter and the wheel, and when the state of (c) at the time of tire removal in FIG. 10 is approached, the flange 5 formed at the corner portion 8 of the casing 2 becomes The tire bead 7 enters under the overhanging portion 9 formed by the reinforcing rib 6, is wrapped from the rear end surface and the side surface of the casing 2 and is pulled up by the roller of the detaching machine, so that the transmitter is attached to the wheel. If the tire is removed in this condition, the casing 2 of the transmitter will be damaged, so remove the transmitter from the wheel beforehand.
(It is necessary to loosen the mounting screw and drop it into the tire), but this work was complicated.

[0007]

SUMMARY OF THE INVENTION The present invention is capable of sufficiently withstanding contact or pressing of a tire bead, and when the tire is removed, the tire bead easily rides on the casing side surface or upper surface. An object of the present invention is to provide a casing structure of a transmitter for a tire pressure alarm device, which enables tire replacement work without removing the transmitter for the tire pressure alarm device by preventing an excessive force from acting on the casing. Is.

That is, the transmitter for a tire air pressure alarm device according to the first aspect of the present invention houses a pressure detecting portion for detecting tire air pressure, a signal processing circuit, an electronic board, a battery, etc. in a rectangular casing 2. In the casing structure of the transmitter 1 for a tire pressure warning device, which is integrally provided with a tire valve 3 so as to project rearward on the upper part of 2,
Forming a front corner portion of the casing 2 into an R shape,
The wall surface 2a at this corner portion has a taper angle θ2 = 6.
It is characterized in that the skirt portion 10 is formed at an angle of 5 to 75 °, and an appropriate R-shaped curve is formed between both ends of the skirt portion 10 and the wall surface 2a from the top surface to the bottom surface of the casing. It is a thing.

A transmitter for a tire air pressure alarm device according to a second aspect of the present invention is a pressure detector for detecting tire air pressure,
A transmitter 1 for a tire air pressure alarm device in which a signal processing circuit, an electronic board, a battery, etc. are housed in a rectangular casing 2, and a tire valve 3 is integrally provided on the upper portion of the casing 2 so as to project rearward. In the above casing structure, the angle θ1 of the front corner portion of the casing 2 is set to 15 to 45.
The angle is within the range of 0 °, and the wall surface 2a at the angle θ1 of this corner portion has a taper angle θ2 = 65 to
The skirt portion 10 is formed at 75 °.

The transmitter for a tire pressure warning device according to the third aspect of the invention has a tongue portion 11 at the center of the casing.
The wall surface 2a in the width of
And a wall surface of the tongue portion 11 and other wall surfaces are rounded from the bottom surface to the top surface of the casing.
It is a thing of Claim 1 and Claim 2 characterized by gradually changing in shape.

Further, in the transmitter for a tire pressure warning device according to the fourth aspect of the present invention, the lower end of the skirt portion 10 formed at the front corner portion of the casing 2 is extended below the wall surface 2a to form the protrusion 12. According to claim 1, claim 2 and claim 3, characterized in that.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an external perspective view of a casing of a transmitter for a tire pressure warning device of the present invention. FIG. 2 is a diagram for explaining the relationship between the skirt portion of the present invention and the conventional rib. As shown in FIG. 1, the transmitter 1 of the present invention has a casing 2 and a tire valve 3 which are formed in a rectangular box shape and are integrally provided, as shown in FIG. A pressure detector, a signal processing circuit, an electronic board, a battery, etc. are housed. In addition, the air injected from the tire valve 3 can be injected into the tire through a ventilation hole 4 formed in a thick wall portion above the casing 2.

The difference between the transmitter 1 of the present invention and the conventional product is that
Forming a front corner portion of the casing 2 into an R shape,
The wall surface 2a at this corner portion has a taper angle θ2 = 6.
The skirt portion 10 is formed at 5 to 75 °. Then, between both ends of the skirt portion 10 and the wall surface 2a, an appropriate R-shaped curve is formed from the upper surface to the bottom surface of the casing. In other words, since the skirt portion 10 is formed into an R-shaped curved surface, when the tire is removed, the same stress is applied to the tire with respect to the contact with the tire bead from any angle, and the electronic substrate and the battery incorporated in the casing are exposed to the stress. Stress can be kept to a minimum. Also,
As shown in FIG. 2, since the R shape of the skirt portion of the present invention is configured to contact the taper angle θ of the conventional reinforcing rib, it is shorter than the conventional reinforcing rib by ΔL. Therefore, the bending moment M applied to the fixed end of the transmitter when the tire bead 7 slides up the casing slope.
Has the advantage of being reduced by ΔL.

FIG. 3 is a diagram showing a second invention. Second
The difference from the conventional product of the invention is that the angle θ1 of the front corner portion of the casing 2 is formed within the range of 15 to 45 °, and the wall surface 2a at the angle θ1 of the corner portion has a taper angle θ2 = The point is that the skirt portion 10 is formed at 65 to 75 °. That is, the corner angle θ1 of the skirt portion is set to the same angle (15 to 45 °) as the angle formed by the wheel and the tire when approaching the state when the tire is removed (C) of FIG. With respect to the rib angle θ2 = 45 to 60 °, the divergence angle θ2 of the skirt portion formed in the corner portion of the present invention corresponding to this angle
= 65 to 75 ° is slightly larger, but as described above, the bending moment M applied to the transmitter fixed end when the tire bead 7 slides up the casing slope is smaller than that of the conventional product, Since the smaller amount of the moment M acts more than the taper angle θ2, it is possible to minimize the stress against the contact with the tire bead when the tire is removed.

FIGS. 4 and 5 are views showing a third invention. A third aspect of the invention is to form the wall surface 2a in the width of the tongue portion 11 in a skirt shape with a taper angle θ2 = 65 to 75 °, and to form the wall surface of the tongue portion 11 and other wall surfaces from the bottom surface of the casing to the upper surface. The shape is gradually changed in an R shape. The tongue portion 11 is different from the case where the tire bead enters the bottom surface of the corner portion of the transmitter when a large gap is generated between the bottom surface of the transmitter and the wheel due to the shape of the wheel, and thus the tongue portion 11 is pulled up. And have an effective shape. That is, when the tire bead approaches the tongue portion 11 in the above-described pulling-up state, the tire rides on the tongue portion 11 due to the taper angle θ3, and the corner portion of the transmitter is The state of the tire bead wrapping on the bottom is gradually alleviated, and eventually all of the tire beads in contact with the transmitter will move to the top of the casing, preventing damage to the casing. Can be done.

FIG. 6 is a diagram showing a fourth invention. 4th invention forms the skirt part 10 with the taper angle (theta) 2 = 65-75 degrees in the wall surface 2a in the front corner part which concerns on 1st invention, and casing between the both ends of this skirt part 10 and the wall surface 2a. The point is that it is formed by an appropriate R-shaped curve from the upper surface to the bottom surface of the above, but in addition to this, the lower end of the skirt portion 10 is extended below the wall surface 2a to form the protrusion portion 12. It is a point. That is, the protrusion 12 is for preventing the tire bead from entering the gap when a large gap is formed between the bottom surface of the transmitter and the wheel due to the shape of the wheel. Mao,
Since the protruding portion 12 is formed in the section from the outer peripheral side surface of the casing 2 to the rear end surface, in order to ensure the contact with the tire bead, the tire on the gap between the bottom surface of the transmitter 1, the wheel and the tire is formed. It is possible to prevent beads from entering. Needless to say, the projection 12 can be applied to the second to third inventions.

Although not shown in particular, the battery, which is a power supply unit housed in the casing 2, is a battery-less device for generating electricity between a magnet having a built-in coil and provided outside the tire. The present invention is applicable even to the transmitter.

Further, although not particularly shown, the casing 2
The present invention is also applicable to a transmitter in which the tire valve 3 is not configured, that is, a so-called valve separation type transmitter in which there is no valve portion for supplying air to the tire.

[0019]

As described above, according to the casing structure of the transmitter for a tire pressure warning device of the present invention, even if the tire bead comes into contact with or hits the casing of the transmitter at the time of tire replacement, the tire bead is not damaged. Since the vehicle smoothly rides on the casing of the transmitter, tire replacement work can be performed without removing the transmitter for the tire pressure warning device. Further, the stress on the electronic substrate and the battery incorporated in the casing can be minimized. Further, the protrusion provided on the skirt portion of the casing has an advantage that the transmitter can be prevented from rotating because the protrusion comes into contact with the wheel when the transmitter is attached to the wheel. As described above, according to the present invention, the quality can be maintained at the time of tire replacement without adding the number of parts, and the manufacturing can be performed at low cost, so that the effect is great.

[0020]

[Brief description of drawings]

FIG. 1 is an external perspective view of a first embodiment of a transmitter for a tire pressure warning device according to the present invention.

FIG. 2 is a diagram illustrating a relationship between a skirt portion of the present invention and a conventional rib.

FIG. 3 is an external perspective view of a second embodiment of a transmitter for a tire pressure warning device according to the present invention.

FIG. 4 is an external perspective view of a third embodiment of the transmitter for a tire pressure warning device according to the present invention.

5 is an external perspective view showing another embodiment of the third embodiment of the transmitter for a tire pressure warning device according to the present invention. FIG.

FIG. 6 is an external perspective view of a transmitter for a tire pressure warning device according to a fourth embodiment of the present invention.

FIG. 7 is an external perspective view of a conventional transmitter for a tire pressure warning device.

FIG. 8 is a sectional view of a storage portion of a transmitter for a conventional tire pressure warning device.

FIG. 9 is an external perspective view of a tire attaching / detaching machine.

FIG. 10 is a process drawing showing the trajectory of a tire bead when the tire is removed.

FIG. 11 is an enlarged perspective view illustrating the positional relationship between the casing of the transmitter and the tire beads in the step (c) of FIG.

FIG. 12 is a mechanical model for obtaining the optimum taper angle value of a conventional transmitter reinforcing rib.

13 is a view showing the relationship between the moment and the taper angle shown in FIG.

[Explanation of symbols]

1 transmitter 2 casing 3 tire valve
4 Vent hole 5 Flange 6 Rib 7 Tire bead 8
Corner 9 Overhang 10 Skirt 11 Tongue
12 protrusion

Claims (4)

[Claims] 1. A tire casing 3 in which a pressure detecting portion for detecting tire air pressure, a signal processing circuit, an electronic substrate, a battery, etc. are housed in a rectangular casing 2, and the casing 2 has a tire valve 3 projecting rearward. In the casing structure of the transmitter 1 for a tire pressure warning device, which is provided in a special manner, the front corner portion of the casing 2 is formed in an R shape,
The wall surface 2a at this corner portion has a taper angle θ2 = 6.
It is characterized in that the skirt portion 10 is formed at an angle of 5 to 75 °, and an appropriate R-shaped curve is formed between both ends of the skirt portion 10 and the wall surface 2a from the top surface to the bottom surface of the casing. Casing structure of transmitter for tire pressure warning device. 2. A tire casing 3 in which a pressure detecting portion for detecting tire air pressure, a signal processing circuit, an electronic board, a battery, etc. is housed in a rectangular casing 2, and the casing 2 has a tire valve 3 integrally projecting rearward. In the casing structure of the transmitter 1 for a tire pressure warning device, which is provided in a specific manner, the angle θ1 of the front corner portion of the casing 2 is formed within an angle range of 15 to 45 °, and the angle θ1 of the corner portion is formed. The wall surface 2a at the taper angle θ2 = 65 to 75
A casing structure of a transmitter for a tire pressure warning device, characterized in that a skirt portion 10 is formed at an angle of °. 3. A wall surface 2a in the width of the tongue portion 11 is formed in a skirt shape with a taper angle θ2 = 65 to 75 ° in the central portion of the casing, and the wall surface of the tongue portion 11 and other wall surfaces of the casing are formed. The casing structure of the transmitter for a tire pressure warning device according to claim 1 or 2, wherein the casing structure is gradually changed in an R shape from the bottom surface to the top surface. 4. A projection 12 is formed by extending a lower end of a skirt portion 10 formed at a front corner portion of the casing 2 below a wall surface 2a to form a protrusion 12. The casing structure of the transmitter for a tire pressure warning device according to claim 3.