JP3310758B2 - Connection terminal used for starting system by DC motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

About the connection pin of the large current flows wiring used to start the engine system and the like by the DC motor BACKGROUND OF THE <br/> Ru.

[0002]

2. Description of the Related Art A connection terminal shown in FIG. 2 is used in an engine starting system using a conventional DC motor. That is, the portion of the cable terminal 2a of the cable 2 is fastened to the terminal block 1 by the fastening bolt 7 and the washer 6 for preventing loosening.

In starting an engine with a DC motor, a large current of 1000 amperes or more flows through the wiring of the starting system although the voltage is low immediately after the start. In this case, in the conventional connection terminal shown in FIG. 2, the contact resistance of the connection terminal portion is 0.1Ω.
Sudden heat generation despite the following: For this reason, devices that cannot increase the mass, such as switches and relays, generally limit the current.

[0004]

In the conventional connection terminal shown in FIG. 2, the tightening pressure of the terminal is increased or the surface of the terminal is coated in order to reduce the contact resistance. The heat generation temperature reaches 300 ° C. or more in a short time depending on the magnitude of the current, the duration of the current, the number of times of the current, and the interval. In this case, when the material such as solder low melting point at the junction of the cable and the terminals are used, the problem of the material to melt occurs. As a result, a short circuit or disconnection of the circuit may occur, leading to cable burnout.

[0005] The present invention is intended to <br/> provide connection pin used in the start-up system by a DC motor which can solve the above problems.

[0006]

According to the DC motor of the present invention,
That connection pin for use in starting system has taken the following means. (1) A metal first heat absorbing plate having a high thermal conductivity is provided on a cable terminal through which a large current flows, and a metal heat absorbing member having a large specific heat and a relatively high thermal conductivity is provided on the first heat absorbing plate. A heat radiation plate, a second heat absorption plate having a large specific heat and a relatively low thermal conductivity is arranged in layers on the heat absorption / radiation plate, and the first heat absorption plate, the heat absorption / radiation plate and the second A heat absorbing plate was fastened to the cable terminal. (2) The first heat absorbing plate is made of copper, the heat absorbing / radiating plate is made of aluminum, and the second heat absorbing plate is made of iron.

[0007]

[Action] Heat is generated in the cable terminal when a large current flows through the contact resistance of the portion of the cable terminal. In the present invention,
Since the first heat absorbing plate in contact with the cable terminal is made of a metal having a high thermal conductivity such as copper, the first heat absorbing plate quickly absorbs heat generated from the connection terminal. Since a heat absorbing and radiating plate made of metal such as aluminum having a relatively high thermal conductivity is disposed on the first heat absorbing plate, the heat absorbed by the first heat absorbing plate is absorbed by the heat absorbing and radiating plate. To the heat sink and radiate heat from the heat absorbing / radiating plate. Further, the heat absorbing / radiating plate is made of a metal such as aluminum having a large specific heat, and the temperature rise due to the heat absorbed is suppressed.

Further, a second heat absorbing / radiating plate disposed on the heat absorbing / radiating plate.
The heat-absorbing plate is made of metal such as iron, which has a large specific heat and relatively low thermal conductivity, so it becomes a cold heat source when absorbing heat generated.
Temperature rise due to absorbed heat is suppressed.

As described above, the heat generated at the cable terminal is rapidly guided to the heat absorbing / radiating plate via the first heat absorbing plate and radiated, and generated by the heat absorbing / radiating plate and the second heat absorbing plate. Since the temperature rise due to heat is suppressed, the temperature rise at the connection terminals can be stopped to a safe degree, and
When the current is interrupted, the connection terminals can be quickly restored to the initial temperature.

[0010]

An embodiment of the present invention EXAMPLES according to the connection pin to be used in the starting system of the engine by a DC motor, is described with reference. In this embodiment, the cable terminal 2 of the cable 2
A first heat absorbing plate 3 made of copper having a high thermal conductivity and a small specific heat having a thickness similar to that of the cable terminal 2a and having two fins 4a is provided on the upper surface of the first heat absorbing plate 3a. The heat absorbing / radiating plate 4 made of aluminum having a large specific heat and a relatively high thermal conductivity is arranged. Further, the second heat absorbing plate 5 made of iron having a large specific heat as a cold heat source and a relatively low thermal conductivity is provided on its upper surface.
And the cable terminal 2 a, the first heat absorbing sheet 3, the heat absorbing / radiating plate 4 and the second heat absorbing sheet 5 are fastened and fixed to the terminal block 1 by the washer 6 and the fastening bolt 7.

In this embodiment, heat flows through the cable terminal 2a due to the current flowing through the cable 2. This generated heat is rapidly absorbed by the first heat absorbing plate 3 made of copper having a high thermal conductivity, and is quickly absorbed by the heat absorbing and radiating plate 4 made of aluminum having a relatively high thermal conductivity via the heat absorbing plate 3. The heat is dissipated from the fins 4a of the heat absorbing / radiating plate 4, and the temperature rise due to the generated heat is suppressed. Further, since the heat absorbing / radiating plate 4 is made of aluminum having a large specific heat, the heat absorbing / radiating plate 4
The temperature rise due to the heat generated is suppressed.

On the other hand, since the second heat absorbing plate 5 made of iron having a large specific heat and a relatively low thermal conductivity is disposed on the heat absorbing / radiating plate 4, the second heat absorbing plate 5 is provided with heat absorbing / radiating heat. It serves as a cold source when the plate 4 absorbs heat, and suppresses a rise in the temperature of the heat absorbing / radiating plate 4.

As described above, the first heat absorbing plate 3 having a high thermal conductivity, the heat absorbing / radiating plate 4 having a large specific heat and a relatively high thermal conductivity, and the second heat absorbing plate having a large specific heat and a relatively low thermal conductivity. The plate 5 rapidly absorbs the heat generated from the cable terminal 2a and dissipates the heat, and suppresses the temperature rise due to the generated heat, so that the temperature rise of the cable terminal 2a is stopped to a safe degree and the current is cut off. At times, the temperature of the cable terminal 2a can be quickly restored to the initial temperature.

According to an experiment conducted by the inventor, the terminal temperature was 100 ° C. or more in the conventional apparatus shown in FIG. Further, in the short-time three-time energization test, the terminal temperature of 270 ° C. or higher in the above-described conventional apparatus was reduced to about 160 ° C. in the present embodiment. From this,
The heat absorption and heat radiation effects of this example were confirmed, and it was found that this example had an effect of preventing a rapid rise in the temperature of the cable terminal in a short time.

In the above embodiment, the first heat absorbing plate 3 is made of copper, the heat absorbing / radiating plate 4 is made of aluminum, and the second heat absorbing plate 5 is made of iron. Other metals having high specific heat and relatively high thermal conductivity and other metals having high specific heat and relatively low thermal conductivity can be substituted. Further, it is effective to increase the thickness of the first heat absorbing plate 3, the heat absorbing / radiating plate 4, and the second heat absorbing plate 5 when the interval between repeated energizations is short.
In addition, when the interval between repeated energizations is long, the thickness can be reduced.

[0016]

As described in the claims, the present invention provides a first heat absorbing plate made of a metal having a high thermal conductivity and a heat absorbing / radiating plate made of a metal having a large specific heat and a relatively high thermal conductivity. In addition, since the second heat absorbing plate made of metal, which has a large specific heat and relatively low thermal conductivity, is arranged in layers and fastened to the cable terminals, the rise in temperature due to the heat generated by the cable terminals during energization is suppressed and the generated heat is rapidly increased. In this case, heat can be absorbed and heat can be dissipated, the temperature rise of the connection terminal can be suppressed, and the temperature of the connection terminal can be quickly restored to the initial temperature when current is interrupted.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a perspective view of a conventional cable terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal block 2 Cable 2a Cable terminal 3 First heat absorbing plate 4 Heat absorbing / radiating plate 5 Second heat absorbing plate 6 Washer 7 Tightening bolt

Claims (2)

(57) [Claims] 1. A first heat absorbing plate made of a metal having a high thermal conductivity is placed on a cable terminal through which a large current flows, and a heat absorbing member made of a metal having a large specific heat and a relatively high thermal conductivity is placed on the heat absorbing plate. A second heat absorbing plate made of metal having a large specific heat and a relatively low thermal conductivity is arranged in layers on the heat absorbing / radiating plate, and the first heat absorbing plate, the heat absorbing / radiating plate, wherein the second heat absorbing plates Ke
DC motor, which is fastened to the cable terminal .
Connection terminal used for the starting system . 2. The DC motor according to claim 1, wherein said first heat absorbing plate is made of copper, said heat absorbing / radiating plate is made of aluminum, and said second heat absorbing plate is made of iron.
Connection terminal used for starting system .