JPH0643536U - Terminal connection structure of transmitter in tire pressure warning device - Google Patents

Abstract

(57) [Summary] [Object] The present invention replaces the terminal connection structure by the split pin 11 and the pin 22 in the conventional transmitter 1 with a contact probe 27 whose tip is slid by an internal spring, and The purpose is to improve the connection between the terminals on the switch 1'side and the transmitter 2'side. The terminal connection structure of the transmitter in the tire air pressure alarm device of the present invention has a lower end of one of the two lead wires 19 and 21 connected to the control unit 20 on the transmitter 2'side. A contact probe 27, the tip of which slides by an internal spring, is fixedly provided on the portion, and when the transmitter 2'is screwed into the pressure switch 1'and fixed,
The tip portion of the contact probe 27 is brought into pressure contact with the upper surface of the metal support base 13 on the pressure switch 1 ′ side by the spring force of the contact plug 27.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tire pressure warning device mounted on a tire wheel, and more particularly to a connection structure between a pressure switch and an input terminal of a transmitter.

[0002]

[Prior art]

 As shown in Fig. 2, the transmitter of a conventional tire pressure alarm device uses a metal bellows 14 that expands and contracts according to the tire pressure and a contact screw 9 as contacts, and when the tire pressure decreases, the bellows 14 expands and conversely increases. In this case, the bellows 14 is contracted so that the contacts are opened, and the transmitter 2 is configured to transmit the tire pressure information to the passenger compartment by using the contacts. It is fixed to the rim hole 4 of the wheel 3 with a nut 7 via a grommet 5 and a flat washer 6. The pressure switch 1 includes a cup-shaped bellows case 10 having a through hole 8 for guiding the tire internal pressure at its side and a contact screw 9 for adjusting a contact position at its lower portion, and an upper shaft. Is provided with a split pin 11 by press-fitting, and is integrally formed with a frame-shaped metal support base 13 having a lower shaft as a stopper 12 and a flange lower surface of the metal support base 13 so as to enclose the lower stopper 12. The metal bellows 14 provided, the insulating packing 15 formed so as to cover the flange upper surface and the outer peripheral surface of the support base 13, and the shaft above the metal support base 13 placed above the insulating packing 15. And a cylindrical housing 16 formed so as to enclose the cotter pin 11 press-fitted in.

On the other hand, the transmitting unit 2 includes a cylindrical metal case 18 having a resin bush 17 in the center, a control unit 20 connected to the metal case 18 by a lead wire 19, and a control unit 20. A pin 22 connected to a lead wire 21 hanging from the lower surface of the center and inserted into a hole of the resin bush 17, a battery 23, a disc-shaped antenna 24 connected to a control unit 20, and the metal case 18 It is composed of a resin case 25 which is inserted from below and is fixedly adhered to the outer side surface of the case, and a lid 26. The control unit 20, the pins 22, the battery 23, and the disk-shaped antenna 24 are fixed in a resin case 25 by casting such as epoxy resin.

Further, the electric circuit in the conventional transmitter is as follows: control unit 20 → lead wire 19 → metal case 18 → housing 16 → bellows case 10 → contact screw 9 → bellows 14 → metal support base 13 → It is connected to the split pin 11 → pin 22 → lead wire 21 → control section 20.

[0005]

[Problems to be solved by the device]

 Therefore, when the transmitter 2 is screwed into the pressure switch 1 for mounting, the operation is troublesome because the pin 22 is screwed while inserting it into the hole of the split pin 11, and the pin 22 is also attached to the split pin 11. If not properly inserted, there will be no continuity or the split pins 11 and 22 will be damaged. In addition, the hole of the split pin 11 is deformed while the transmitter 2 is repeatedly attached and detached, and good fitting cannot be obtained. Therefore, in order to solve these problems, the dimensional accuracy of the split pin 11 and the pin 22 is increased or the material is changed, but the cost is increased and it is not an appropriate solution.

[0006]

[Means for Solving the Problems]

 According to the present invention, by replacing the terminal connection structure by the split pin 11 and the pin 22 in the conventional transmitter 1 with the contact probe 27 whose tip portion slides by the internal spring, the pressure switch 1 ′ side and the transmission side are transmitted. The purpose is to improve the connection of the terminal portion on the part 2'side.

That is, the terminal connection structure of the transmitter in the tire air pressure alarm device of the present invention is such that the pressure switch 1 that opens and closes the contact by detecting the tire air pressure, and the open / closed state of the contact of the pressure switch 1 in the vehicle interior. In the transmitter of the tire air pressure alarm device including the transmitting unit 2 for transmitting, in the lower end portion of one of the two lead wires 19 2 connected to the control unit 20 on the transmitting unit 2 ′ side, A contact probe 27, the tip of which slides by an internal spring, is fixedly provided, and when the transmitter 2'is screwed into and fixed to the pressure switch 1 ', the tip of the contact probe 27 is located on the pressure switch 1'side. An electric circuit is formed on the upper surface of the metal supporting base 13 so as to be pressed against it by the spring force of the contact plug 27. It

[0008]

[Action]

 The terminal connection structure of the transmitter in the tire air pressure alarm device of the present invention is the same as the conventional split pin when the transmitter 2 is screwed and fixed to the pressure switch 1'which detects the air pressure of the tire and opens and closes the contact. It is easy to assemble because it is not necessary to fit the pin 22 into the hole of 11. Further, the spring inside the contact probe 27 maintains good electrical connection between the transmitter 2'side and the pressure switch 1'side.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the transmitter in the tire pressure warning device of the present invention comprises a pressure switch 1'and a transmitter 2 '. In the conventional pressure switch 1, the split pin 11 is fixed to the shaft provided above the metal support base 13 by press fitting. However, the pressure switch 1'of the present invention only needs to remove the split pin 11. Yes, the other parts configuration is exactly the same as the conventional product. Further, in the transmitter 2 ′, the pin 22 is fixed to the lower end of one of the two lead wires 19 and 21 connected to the controller 20 by soldering in the conventional product. A contact probe 27 is fixed instead of the pin 22, and the contact probe 27 is composed of a spring 27b for pressing the needle 27a and a sleeve 27c for inserting them. The other components are the same as the conventional product. Further, the electric circuit in the transmitter of the present invention includes a control unit 20 → lead wire 19 → metal case 18 → housing 16 → bellows case 10 → contact screw 9 → bellows 14 → metal support base 13 → contact probe 27 → leads. The line 21 is connected to the control unit 20.

[0010]

[Effect of device]

 The terminal connection structure of the transmitter of the present invention uses the contact probe 27 instead of the combination of the split pin 11 and the pin 22 which has been used as a conventional connecting member, so that the transmitter 2'is screwed into the pressure switch 1 '. When fixing with, the pin 22 does not have to be fitted into the hole of the split pin 11 as in the conventional case, so that the assembly is easy. Further, if the pin 22 is not properly inserted into the split pin 11, there will be no conduction and the split pin 11 and the pin 22 will not be damaged, so the reliability is significantly improved.

[Brief description of drawings]

FIG. 1 is a semi-longitudinal side view showing a transmitter of the present invention.

FIG. 2 is a semi-longitudinal side view showing a conventional transmitter.

[Explanation of symbols]

1,1 'Pressure switch 2,2' Transmitter, 3
Wheels, 4 rim holes, 5 grommets, 6
Plain washer, 7 nut, 8 conduction hole, 9 contact screw, 10 bellows case, 11 split pin, 12 stopper, 13 metal support base, 14 metal bellows, 15 insulating packing, 16 housing, 17 resin bush,
18 metal case, 19 lead wire, 20 control section, 21 lead wire, 22 pin, 23
Battery, 24 disk-shaped antenna, 25 resin case, 26 lid, 27 contact probe.

Claims (1)

[Scope of utility model registration request] 1. A transmitter of a tire pressure warning device, comprising: a pressure switch 1 for detecting a tire pressure and opening / closing a contact; and a transmitter 2 for transmitting an open / closed state of the contact of the pressure switch 1 to a vehicle interior. Of the two lead wires 19 and 21 connected to the control unit 20 on the transmitter 2 ′ side, a contact probe 27 whose tip slides by an internal spring is fixed to the lower end of one lead wire 21. When the transmitter 2'is screwed into the pressure switch 1'and fixed, the tip of the contact probe 27 is pressed against the upper surface of the metal support base 13 on the pressure switch 1'side by the spring force of the contact plug 27. A terminal connection structure of a transmitter in a tire pressure warning device, characterized in that an electric circuit is formed in such a manner.