Tire pressure monitor

• US 8,474,312 B2
• Filed: 12/02/2011
• Issued: 07/02/2013
• Est. Priority Date: 12/02/2011
• Status: Expired due to Fees

• Current Assignee: Josn Electronic Co., Ltd.
• Original Assignee: Josn Electronic Co., Ltd.
• Inventors: Liao, Wen-Ping
• Primary Examiner(s): ALLEN, ANDRE J
• Application Number:
  US13/309,715
• Publication Number:
  US 20130139582A1
• Time in Patent Office: 578 Days
• Field of Search: 73146-1468
• US Class Current: 73/146.8
• CPC Class Codes: B60C 23/0452 Antenna structure, control or arrangement vehicle tyre mounted antennas H01Q1/2241
• CPC Class Codes: B60C 23/0494 Valve stem attachments positioned inside the tyre chamber

Abstract

A tire pressure monitor enables the TPMS (Tire Pressure Monitoring System) in a tire to detect and send a tire pressure signal from an air faucet to the outer side of the wheel rim by an antenna connecting line, and uses an insulation sleeve to isolate an electrical transmission between the air faucet and an external air faucet so that the whole external air faucet becomes an insulating and independent transmitting antenna which can be unaffected by the serious shield from the wheel rim or steel wire annulus. Therefore, the tire pressure can be measured directly by the tire pressure detector inside of the tire and the transmitting signal can be sent accurately to the receiver in the vehicle in order to enhance the reliability of measuring tire pressure and driving safety.

Claims

1. A tire pressure monitor having a tire pressure detector installed inside a tire, comprising:

a tire pressure detector having a body, the body being provided on a wheel rim inside a tire, and a tire pressure monitor PCB being provided in the body;

an air faucet made of metal and provided at a front end of the tire pressure detector, the outside of the air faucet being in the form of threads, a leakproof cushion being set around the root, the air faucet being clamped with a screw nut after an external part of the air faucet passes through a piercing hole of the wheel rim so that a first conducting hole being axially formed, and the external part of the first conducting hole is formed into a first connector;

an antenna connecting line having both ends pass through the first conducting hole, and an inside end thereof electrically connecting an antenna contact on the tire pressure monitor PCB;

an external air faucet made of metal conductor, a second conducting hole being axially provided in the external air faucet, the internal part of the second conducting hole is formed into a second connector corresponding to the first connector of the first conducting hole, the second connector and the first connector being connected end to end, and electrically connecting an outside end of the antenna connecting line, and an air faucet bolt being provided outside of the second conducting hole; and

an insulation sleeve having an axial hole and being provided between the first connector and the second connector in order to isolate the electrical transmission between the air faucet and the external air faucet so that the external air faucet being formed to be an independent transmitting antenna without an interference from the tire.

2. The tire pressure monitor as claimed in claim 1, wherein the internal diameter of the first connector is larger than the external diameter of the second connector for the second connector to extend into the internal diameter of the first connector, and the insulation sleeve is fixed between the internal diameter of the first connector and the external diameter of the second connector.

3. The tire pressure monitor as claimed in claim 2, wherein the outer side surface of the insulation sleeve has a flange outward extended in a radial direction.

4. The tire pressure monitor as claimed in claim 1, wherein the external diameter of the first connector is smaller than the internal diameter of the second connector for the first connector to extend into the internal diameter of the second connector, and the insulation sleeve is fixed between the external diameter of the first connector and the internal diameter of the second connector.

5. The tire pressure monitor as claimed in claim 4, wherein the outer side surface of the insulation sleeve has a flange inward extended in a radial direction.