Withstand voltage testing device

Abstract

To provide a withstand voltage tester that reduces erroneous determination in a withstand voltage test for a high-voltage coil device.SOLUTION: An ignition coil 70 (high-voltage coil device) can supply electromotive voltage generated by an induction coil to the outside via a spring 75. A metal jig 11 of a withstand voltage tester 101 accommodates a joint 74 and a plug cap 76 of the ignition coil 70 and supports a coil case 71 with seal rubber 73 therebetween. A connection member 20 for a test is formed of conductive material into a rod shape, has a top part 21 and a column part 22, and is applied with test voltage from the ignition coil 70. An insulation protective tube 301 is formed of insulating material into a hollow cylindrical shape, has the column part 22 of the connection member 20 for a test inserted therein, and has an outer peripheral surface 33 on a side of the ignition coil 70 inserted into the plug cap 76. The insulation protective tube 301 has an uneven shape whose radial dimension alternately increases and decreases which is formed on the outer peripheral surface 33 on the side of the ignition coil 70 accommodated in the plug cap 76.SELECTED DRAWING: Figure 5

Claims

1. A voltage withstand test device for performing a voltage withstand test in the manufacturing process of a high-voltage coil device (70) comprising a coil case (71) including an induction coil, a joint (74) formed in a cylindrical shape from an insulating material and extending to one side from the coil case, a seal rubber (73) that insulates the end face of the coil case on the joint side, an insulating mounting cap (76) attached to the tip of the joint, and a conductive spring (75) that applies a biasing force from the coil case side to the mounting cap side, wherein the electromotive force generated by the induction coil is supplied to the outside via the spring, A conductive metal jig (11) that houses the joint and mounting cap of the high-voltage coil device and supports the coil case via the sealing rubber, A test connecting member (20) is formed in the shape of a rod from a conductive material and has a top portion (21) that abuts the tip of the spring inside the mounting cap, and a column portion (22) that extends from the top portion to the opposite side of the spring, and to which a test voltage is applied from the high-voltage coil device, An insulating protective tube (301) formed in a cylindrical shape from an insulating material, into which the column portion of the inspection connecting member is inserted, and whose outer peripheral surface (33) on the high-voltage coil device side is insertable into the mounting cap, A high-voltage probe (50) for measuring the test voltage applied to the test connection member, A high-voltage leak detection circuit (51) detects a high-voltage leak in which a current exceeding a predetermined value flows through the metal jig when an inspection voltage is applied from the high-voltage coil device to the inspection connecting member, Equipped with, The dielectric strength testing device wherein the insulating protective tube has an uneven shape formed on the outer surface of the high-voltage coil device side that is housed in the mounting cap, with large diameter portions and small diameter portions arranged alternately so that the diameter alternately increases and decreases, and there is an annular gap between the outer surface of the large diameter portion housed in the mounting cap and the inner wall of the mounting cap.

2. A connecting member holder (40) is formed of an insulating material, is positioned with a space between it and the metal jig, and supports the end of the inspection connecting member opposite to the high-voltage coil device, A holding actuator (45) holds the inspection connecting member so as to contact the spring of the high-voltage coil device at a predetermined relative position, The dielectric strength testing apparatus according to claim 1, further comprising:

3. The voltage withstand test device according to claim 1 or 2, wherein the high-voltage coil device is an ignition coil that causes a discharge at a spark plug (80) in an engine.

4. The dielectric strength testing apparatus according to claim 1 or 2, wherein the insulating protective tube is formed of a two-component thermosetting epoxy resin.

5. The dielectric strength testing apparatus according to claim 2, wherein the holding actuator has a servo function for controlling the relative position of the inspection connecting member with respect to the spring of the high-voltage coil device to a variable target value.

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