WO2002018895A1

WO2002018895A1 - Torque tester

Info

Publication number: WO2002018895A1
Application number: PCT/KR2000/000895
Authority: WO
Inventors: Young Jong Won
Original assignee: Fine Instrument Corporation
Priority date: 1999-01-21
Filing date: 2000-08-11
Publication date: 2002-03-07
Also published as: KR100355960B1; KR20000051376A; CN1378644A

Abstract

The present invention relates to the torque tester which is very precise with simple operation. Since the torque tester in accordance with the present invention includes a torque sensor for sensing the torque applied; an adaptor for adjusting gain of inputted sense signal from the torque sensor and outputting gain-adjusted sense signal as display signal; and a digital multimeter for displaying a numerical number corresponding the value of the display signal form the adaptor on the display panel, the user can check whether bolt or nut is screwed adequately by numerical number displayed on display panel while screwing them after connecting torque sensor to digital multi-meter through adaptor. Thus the convenience of using is provided and the simplicity of operating is accomplished.

Description

Title of the Invention

Torque tester

Technical Field

The present invention relates to the torque tester, and more particularly, torque tester which confirms that the user can check the bolts and nuts are screwed adequately by the torque as much as he wants while he equips a car with an engine.

Background Art

Typically, the magnetic torque meter for measuring the rotatory power can be divided into two types, an absorption type and a transmission type. The absorption type includes a frictional power meter which absorbs the power generated by a motor through friction between solids, a water power meter which absorbs the power through a rotator stirring water, a air power meter which absorbs the power through a rotating fan arranged in the air and an electric power meter which measures electric force generated by an electric generator or an electrical load which consumes the power.

And the transmission type torque meter includes a twist force meter which measures twist force of axis which transmits the power to a load and receives twist force in proportion with the torque. Furthermore there may be various torque meters in the view of the method for measuring twist force.

In accordance with a rapid progress in reduction of engine's weight of an automobile, not only a conventional torque meter fails to check whether bolts and nuts are screwed adequately when the user equips an automobile with an engine but also .a conventional torque meter has such complicate operating process that the beginner feels hard to operate it.

Furthermore, if the user drives an automobile in such a case that bolts ISA/KR 08. 01. 2002

and nuts inside are not screwed by proper torque, an terrific accident could be caused by a leakage of the engine oil, and rate of combustion could be lowered by an disorder in the burning of the gasoline.

Disclosure of Invention

To solve the above problems, it is an object of the present invention to provide the torque tester which can be operated precisely and simply

To achieve the object of the present invention, the torque tester of the present invention comprises a torque sensor for sensing the torque applied , an adaptor for adjusting gain of inputted sense signal from the torque sensor and outputting gain-adjusted sense signal as display signal, and a digital multimeter for displaying a numerical number corresponding the value of the display signal from the adaptor on the display panel..

Brief Description of Drawings

The above object and advantages of the present invention will become more apparent by describing in detail preferred embodiment thereof with reference to the attached drawings in which;

Fig. 1 shows the structure of torque tester according to a preferred embodiment of the present invention.

Fig. 2 shows a circuit diagram of torque sensor shown in Fig. 1.

Fig. 3 shows a detailed circuit diagram of adaptor shown in Fig. 1.

Best Mode for Carrying Out the Invention Referring now to the attached drawings, the preferred embodiment according to the present invention is described in detail.

Fig. 1 shows a structure of an embodiment of the present invention.

Referring to Fig. 1 , reference number 10 denotes the torque sensor for sensing

the torque which is applied to the screwing tool 80, reference number 20

denotes an adaptor for adjusting a gain of inputted sense signal from the ISA/KR 08. 01. 2002

torque sensor and outputting gain-adjusted sense signal as display signal and

reference number 30 denotes a digital multi-meter for displaying a numerical

number corresponding the value of the display signal from the adaptor on the

display panel..

As shown in Fig. 2, the torque sensor 10 comprises a strain gage 11 , the first variable resistor VR1 for adjusting an offset of the digital multi-meter 30 and the second variable resistor VR2 for adjusting a gain of the strain gage 11. The torque sensor 10 is serially connected between pin 1 and pin 3 among 6 output pins(here, NC denotes no connection), and the torque sensor 10 is comprised of two variable resistors VRG1 and VRG2 whose junction point is connected to pin 2.

The second variable resistor VR2 is connected between pin 1 and pin 3, and connected to pin 5 through the resistor R1. And, one terminal of the first variable resistor VR1 is connected to pin 5 and the other terminal is connected to pin 4.

Although the screwing tool 80 is constituted by a socket wrench which has been generally adapted to bolts and nuts, not only it is not limited in such things but also it can be set directly to spanner or driver, etc.

The strain gage 11 is fixed to the middle part of said the screwing tool 80.

As shown in Fig. 3, the adaptor 20 comprises an amplifier which amplifies the sense signal inputted through each output pin of the torque sensor 10 and transmits the result to digital multi-meter 30, a gain controller VR01 which controls the gain of the adaptor 20 when the adaptor 20 was connected to the digital multi-meter 30, and switch which sets on/off of the operating mode, the torque's value display 1 b, ft. and Newton's value display N, m, and the light emitting diode LED as a display means which emits light signal when the user turns on the adaptor 20.

The turn-on of the adaptor 20 is automatically accomplished along with ISA/KR 08. 01. 2002

switching operation of the switch SW to the location of torque value display 1 b, ft or Newton's value display N, m. And in the case that switch SW is switched to the location "off', the adaptor 20 is turned off.

Here, the switch SW is established to the upper portion of adaptor 20 so that the user operate it and light emitting diode LED is established to the portion that the user can recognize it.

And, the gain controller VR01 is built in the inner side of an adaptor, and it should be controlled by manufacturer at the optimum gain during manufacturing process. In Fig. 3, un-described reference number 22 denotes the driving amplifier to drive the light emitting diode LED, un-described reference number 23 denotes OP amplifier for setting mode, which amplifies the difference between pin 4 of the torque sensor 10 and output from the amplifier 21 , un- described reference number 24 denotes the voltage regulator providing the regulated voltage to the adaptor 20, un-described reference number 90 denotes a wrench, and un-described reference number 92 denotes a bolt. Subsequently, the operation of the torque tester according to the present invention is described in detailed as follows.

At first, the user must adjust the offset of the digital multi-meter 30 and the gain of strain gage 1 1 by adjusting the first variable resistor VR1 and the second variable resistor VR2 respectively.

At this time, the switch SW on the adaptor 20 is in the state that it switches into operation on-mode (Ib.ft or N.n), and the light emitting diode LED is in the state that it emits light signal. After then, if the user puts a bolt or a nut in the torque sensor 10 and then starts to screw, the strain gage 1 1 within the torque sensor 10 transfers the torque applied into corresponding voltage signal and transmits the voltage signal to adaptor 20. The amplifier 21 of the adaptor 20 amplifies voltage signal inputted and transmits the result to digital multi-meter 30. As the result of these process, the numerical number corresponding to the torque currently applied is displayed on the display panel 40. ISA/KR 08. 01. 2002

Accordingly, with looking the numerical number displayed on the display panel 40, the user can controls the power applied to bolt or nut Industrial Applicability

As described in the above, according to the present invention, since the user can check whether bolt or nut is screwed adequately by numerical number displayed on display panel while screwing them after connecting torque sensor to digital multi-meter through adaptor,, the convenience of using is provided and the simplicity of operating is accomplished. On the other hand, the present invention is not limited the embodiments as described in the above but it can be used to amend and to change within the main point of the present invention, and the technical idea due to such a amendment and the changing must be regarded as it belong to the following claims.

Claims

ISA/KR 08. 01. 2002What is claimed;

1. The torque tester comprising; a torque sensor for sensing the torque applied; an adaptor for adjusting a gain of inputted sense signal from the torque sensor and outputting gain-adjusted sense signal as display signal; and a digital multi-meter for displaying a numerical number corresponding the value of the display signal from the adaptor on the display panel.

2. The torque tester in accordance with claim 1 , wherein said torque sensor comprising; strain gage, fixed in middle part of screwing tool, for reacting to the torque applied and outputting voltage signal corresponding to the torque, and first variable resistor for controlling the off-set of said digital multi-meter, second variable resistor for controlling the gain of said strain gage.

3. The torque tester in accordance with claim 1 , wherein the adaptor amplifies the sense signal from the torque sensor and comprising; gain controller for controlling the gain of the adaptor when the adaptor is connected to the digital multi-meter; switch for setting operation mode along with user's operation; and the display means for displaying the state of the present operation.

4. The torque tester in accordance with claim 3, wherein the display means is an light emitting diode.