JPH0138386Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal box for a solenoid valve, and more particularly to an improvement in the ground terminal mounting portion of the terminal box.

In a normal solenoid valve, a terminal box is attached to the solenoid valve to electrically connect the solenoid as the driving device of the solenoid valve and a power source, and a terminal box is attached to the terminal box to connect the ground terminal to the solenoid valve body. A ground terminal connection is provided. The conventional structure of such a terminal box is to insert a grounding screw into a commonly used mounting hole, screw the tip of the grounding screw into a threaded hole in the solenoid valve body, and then attach the terminal box to the synthetic resin terminal box body. The ground terminal is fixed between the head of the mounting screw and the head of the mounting screw.

By the way, when fixing a terminal between a synthetic resin terminal box body and the head of a mounting screw, not only dimensional shrinkage occurs due to changes over time such as creep of the synthetic resin material due to tightening force. In hydraulic solenoid valves, where the solenoid valve body is relatively hot (for example, it can reach 100 degrees Celsius), the terminal box directly attached to the solenoid valve body is also affected by the heat, so terminal box creep may occur. This accelerates the loosening of the mounting screws, which causes the ground terminal to loosen, resulting in poor contact.

If we try to solve these problems by changing the characteristics of the synthetic resin material that makes up the terminal box body, it will be necessary to use a high-grade, expensive resin material that contains several 10% glass. There is a problem of high cost.

Accordingly, an object of the present invention is to provide a terminal box for a solenoid valve in which the ground terminal does not become loose due to creep of the resin material constituting the terminal box.

The present invention includes a terminal box main body having an outer box and an inner box made of synthetic resin, and the terminal box main body is attached to the main body of a solenoid valve to electrically connect the solenoid of the solenoid valve to a power source. In the terminal box for a solenoid valve, the inner box and the outer box have through-holes that are aligned with each other, a metal space pipe is arranged in the through-hole, and a ground is installed in the space pipe. A screw is inserted and the grounding screw is screwed into the screw hole of the solenoid valve body, and the grounding terminal is connected and fixed within the terminal box by working together with the space tube and the grounding screw. has been done.

In the above configuration, if the outer box of the terminal box is fixed to the main body of the solenoid valve, the ground terminal is placed on top of the space pipe, and the mounting screw is screwed into the screw hole of the main body, the ground terminal will be connected to the space pipe and the main body of the solenoid valve. and is electrically connected to the main body via a mounting screw. Therefore, even if the ground terminal is fixed with a large clamping force, the clamping force is not directly applied to the terminal box body. In addition, loosening of the ground terminal due to creep of the terminal box body is also prevented.

Embodiments of the terminal box according to the present invention will be described below with reference to the drawings.

1 and 2, a terminal box 10 of this embodiment is shown. In the figure, 1 is a solenoid valve, 2 is a metal body of the solenoid valve, 3 is a solenoid for driving the solenoid valve, and 4 is an insertion terminal of the solenoid.

The terminal box 10 has an outer box 12 that is fixed to the electromagnetic valve body 2 with mounting screws 14, and an inner box 13 that is mounted inside the outer box 12. The outer box 12 and the inner box 13 are made of synthetic resin and form the main body 11 of the terminal box. Although not shown, the outer box 12 and the inner box 13 may be formed integrally.

A printed circuit board 15 is arranged and fixed at the bottom of the outer box 12 and between it and the inner box 13.
A conductive holder 16 is attached to the solenoid side solenoid-side plug terminal 4 to make contact therewith.

Through-holes 12b and 13b, which are aligned vertically, are formed in one place of the terminal connection part 13a partitioned by the bottom 12a of the outer box 12 and the partition wall of the inner box 13, and a metal space pipe is inserted into the through-hole. 17 is inserted through the solenoid valve body with its lower end in contact with the solenoid valve body. The length of the space pipe 17 is approximately the same as the height from the mounting surface of the solenoid valve main body, that is, the upper surface 5 to the upper surface of the terminal connection portion 13a of the inner box 13.

A length installation screw 18 for the earth terminal is inserted into the space tube 17, and the tip of the installation screw 18 is adapted to be screwed into the screw hole 6 of the electromagnetic valve body. The ground terminal 20 is connected to the space tube 17
The mounting screw 18 and the space pipe 17 cooperate to connect and fix the solenoid valve body 2 within the terminal box. Therefore, the electrical connection between the ground terminal 20 and the solenoid valve body 2 is made through the mounting screw 18 and the space pipe 17, unlike the conventional method, which is made only through the mounting screw. certainty can be obtained. Furthermore, since the ground terminal is crimped between the metal space tube and the mounting screw, the crimping force can be increased, so that loosening of the ground terminal due to creep of the synthetic resin main body can be prevented.

Further, the ground terminal 20 is made larger than the diameter of the space tube 17 so that the lower surface of the peripheral part of the ground terminal is connected to the terminal connection part 1 of the inner box 13 around the through hole 13b.
3a and fix the ground terminal to the space tube with the mounting screw 18, the inner box can be fixed with respect to the outer box. Moreover, since no large tightening force is applied to the inner box itself, there is no need to increase the wall thickness of the inner box or the terminal connection part of the main body, and even if a space G is formed at the bottom, the ground terminal No slack will occur.

Note that 21 is a power supply connection conductor whose lower end is electrically connected to the printed circuit board and whose upper end is arranged at the terminal connection part of the inner box, and 22 is a cover.

As is clear from the above description, the terminal box according to the present invention can achieve the following effects.

(a) The ground terminal is tightened and fixed using a metal space tube and mounting screw, and large tightening force is not applied directly to the terminal box body, so the ground connection is complete, and it is very useful for body grounding such as vehicle solenoid valves. Can conduct current.

(b) Since the synthetic resin main body is not directly used to secure the ground terminal, there is no possibility of loosening of the ground terminal due to creep of the synthetic resin material due to temperature changes, clamping force, etc., or loosening of the ground terminal due to vibration. Occurrence can be prevented.

(c) Since the ground terminal clamping force does not act directly on the terminal box body, it is possible to reduce costs by using a relatively thin resin material that is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a terminal box for a solenoid valve according to an embodiment, and FIG. 2 is a sectional view taken along the line - in FIG. 1. 10: Terminal box, 11: Main body, 12: Outer box, 1
3: Middle box, 17: Space pipe, 18: Installation screw.

Claims (1)

[Scope of utility model registration request] A solenoid comprising a terminal box main body having an outer box and an inner box made of synthetic resin, and the terminal box main body is attached to the main body of a solenoid valve to electrically connect the solenoid of the solenoid valve to a power source. In the valve terminal box,
The inner box and the outer box are formed with through holes that are aligned with each other, and a metal space tube is disposed in the through hole, and a grounding screw is inserted into the space tube and the grounding screw is fixed. 1. A terminal box for a solenoid valve, which is screwed into a screw hole of a solenoid valve body, and a ground terminal is connected and fixed within the terminal box by cooperation of the space tube and the ground mounting screw.