JPS63184275A - Duct conductor joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a duct conductor joint used for connecting electrical wiring.

[Background technology]

A typical conventional duct conductor joint is shown in FIG. 3. In FIG. 1, the conductor l is made of copper or the like and has an insertion recess 2 at one end. The insertion recess 2 is a cylindrical hole provided in the axial direction of the conductor l.

The joint body 3 is entirely made of copper or the like, and the 0-divided insertion bent portion 4 having a divided insertion convex portion 4 at one end is
The 0-divided insertion curved part 4, which is a cylinder formed in the axial direction and divided into two in the circumferential direction, has its rear end supported by a support part 3a, and its distal end within a certain range around the rear end. It can flex and exert force. Further, the tip portion is tapered and has a small diameter. The joint body 3 has a spline-shaped connecting portion 7 at the other end. 11 hand body 3
is connected to the conductor 8 by press-fitting the connecting portion 7 into the conductor 8 having the same configuration as the conductor 1.

The spring body 6 is a disc spring made of steel, and is disposed in contact with the inner circumferential portion of the split insertion convex portion 4, and has one flat end portion supported by the support portion 3b. The spring body 6 resists the reaction force of the deflection of the divided insertion convex portion 4 and expands the divided insertion convex portion in the radial direction.

According to such a configuration, the joint body 30 connected to the conductor 8 is inserted into the insertion recess 2, and the outer periphery of the divided insertion protrusion 4 is pushed into the inner periphery of the insertion recess 2 by the spring force of the spring body 6. Being pushed. By connecting the conductor 1 and the joint body 3 in this manner, the conductor 1 and the conductor 8 are electrically connected.

However, this configuration has a problem in that contact reliability and workability are not compatible. That is, in order to ensure the connection between the joint body 3 connected to the conductor 8 and the conductor l and improve contact reliability, the spring force of the spring body 5 must be increased, but if this is done, the joint Because a strong force is required when inserting the main body 3, workability is poor.

[Object of the Invention] An object of the present invention is to provide a duct conductor joint that does not require strong force for connection, has reliable connection, high contact reliability, and suppresses heat generation due to contact resistance.

[Disclosure of the invention]

The duct conductor joint of the present invention has a joint body having a divided insertion convex portion divided into a plurality of parts in the circumferential direction to be inserted into a conductor insertion recess at one end, and a connecting portion connected to another conductor at the other end. and a spring body that is interposed between the divided insertion convex parts and biases the divided insertion convex parts to expand in the radial direction, wherein the spring body is deformed at a constant temperature and has a spring force. It uses a shape memory alloy that increases the

According to the configuration of the present invention, a shape memory alloy that deforms at a constant temperature to increase the spring force is used as a spring body that expands the divided insertion convex portion of the joint body in the radial direction. Even if the initial spring force of the spring body is set to such an extent that it can be easily inserted into the spring body, the spring body deforms due to heat generated by the contact resistance of energization after connection and increases the spring force. Then, the pressing force of the divided insertion protrusion against the insertion recess is increased to strengthen the connection. At this time, the contact pressure between the divided insertion protrusion and the insertion recess increases, thereby suppressing heat generation due to contact resistance.

In this way, strong force is not required for connection, and the connection is strong and has high contact reliability.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2. This duct conductor joint has a divided insertion convex part 4 divided into a plurality of parts in the circumferential direction to be inserted into the insertion recess 2 of the conductor l at one end, and a connecting part 7 connected to the ground conductor 8 at the other end. In the duct conductor joint, the spring body 5 is provided with a joint body 3 having a joint body 3 and a spring body 5 that is interposed between the divided insertion convex parts 4 and biases the divided insertion convex parts 4 to expand in the radial direction.
It uses a shape memory alloy that deforms at a constant temperature to increase the spring pressure. The spring body 5 is made of a bidirectional shape memory alloy that deforms so that the spring stiffness increases when the temperature exceeds a certain level, and returns to its original state when the temperature falls below a certain level (Figure 2).

The rest of the structure is the same as that of the conventional example shown in FIG. 3, so the same reference numerals are used in the figure and the explanation thereof will be omitted.

According to the configuration of this embodiment, the spring body 5 that expands the split insertion protrusion 4 of the joint body 3 in the radial direction is made of a shape memory alloy that deforms at a constant temperature to increase the spring force. Even if the initial spring force of the spring body 5 is set to such an extent that it can be easily inserted into the insertion recess 2 of the conductor 1, the spring body 5 may be deformed due to heat generated by contact resistance when energized after connection, causing the spring to deform. Increase power.

Then, the connection is strengthened by increasing the pressing force of the divided insertion protrusion 4 against the insertion recess 2. At this time, the contact pressure between the divided insertion protrusion 4 and the insertion recess 2 increases, so heat generation due to contact resistance is reduced. In this way, strong force is not required for connection, and the connection is strong and has high contact reliability.

The spring body 5 may be made of a unidirectional shape memory alloy that deforms above a certain temperature and does not return to its original state even when the temperature falls below a certain temperature. That way, the connection will remain strong even if the power is turned off.

The spring body 5 may be a coil spring or a torsion spring.

The divided insertion convex portion may be divided into three or more parts.

The connecting portion 7 may have the same configuration as the divided insertion convex portion 4.

〔Effect of the invention〕

According to the duct conductor joint of the present invention, a shape memory alloy that deforms at a certain temperature to increase the spring force is used as a spring body that expands the split insertion projection of the joint body in the radial direction. Even if the initial spring force of the spring body is set to such an extent that the spring body can be easily inserted into the insertion recess, the spring body is deformed by heat generation due to contact resistance during energization after connection, increasing the spring force. Then, the pressing force of the divided insertion protrusion against the insertion recess is increased to strengthen the connection. At this time, the contact pressure between the divided insertion protrusion and the insertion recess increases, thereby suppressing heat generation due to contact resistance.

In this way, strong force is not required for connection, and the connection is strong and has high contact reliability.

[Brief explanation of the drawing]

FIG. 1 is a broken side view of an embodiment of the present invention, FIG. 2 is a diagram of a deformed state of the spring body, and FIG. 3 is a broken side view of a conventional example. 1.8...Conductor, 2...Insertion recess, 3...Joint body, 4...Divided insertion protrusion, 5...Spring body, 7...
Connection part Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] A joint body having a plurality of split insertion protrusions in the circumferential direction that are inserted into conductor insertion recesses at one end and a connecting part connected to another conductor at the other end; A duct conductor joint comprising a spring body interposed between the spring bodies that biases the divided insertion convex portions to expand in the radial direction, and the spring body is made of a shape memory alloy that deforms at a constant temperature to increase the spring force. A duct conductor joint characterized by: