JPH04134124U - grommet - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding the grommet 5 made of a rubber-like elastic material that is press-fitted into the lead wire outlet 3 opened in the case 1 of an electrical device, the sealing performance between the grommet 5 and the case 1 is evaluated. Improve. [Structure] A potting agent introduction groove 11 is provided on the outer peripheral surface 9 of the grommet 5, and the potting agent 4 is introduced from the potting agent introduction groove 11 into the gap 12 between the grommet 5 and the case 1. to seal between the grommet 5 and the case 1.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to the improvement of waterproof grommets used in lead wiring of electrical equipment. do.

0002

[Conventional technology]

As shown in Figures 7 and 8, case 1 of electrical equipment such as solenoids and sensors When taking out the lead wire 2 from the case 1 to the outside, the lead wire take-out part 3 is opened, and a grommet 5 made of a rubber-like elastic material is press-fitted into the lead wire extraction portion 3. Ru. The case 1 is filled with a potting agent 4. However, as shown in FIGS. 9 to 11, the conventional grommet 5 has a front surface 6. A required number of through holes 8 are provided from the rear surface 7 through which the lead wires 2 are inserted. An engagement groove 10 that engages with the periphery of the lead wire take-out portion 3 of the base 1 is provided. grommet Between the grommet 5 and the case 1, the grommet 5 is slightly larger than the lead wire outlet 3. By forming the grommet 5 to have a tightening margin for the case 1, A part of the through hole 8 is sealed between the grommet 5 and the lead wire 2. The grommet 5 is formed to be slightly thinner than 2 so that the grommet 5 has a tightening margin for the lead wire 2. It is sealed by putting it on.

0003

[Problem that the idea aims to solve]

The above conventional technology relies only on the tightening margin of the grommet 5 to the case 1, and The space between the cut 5 and the case 1 is sealed. Grommet 5 and case 1 are not glued together It is. Therefore, the lead wire 2 was pulled and the grommet 5 was deformed. case, or when there are dimensional variations in the size of the lead wire outlet part 3 of case 1, etc. In addition, a gap is created between the grommet 5 and the case 1, which impairs the sealing performance. There is a problem.

0004

[Means to solve the problem] In view of the above points, the present invention was devised in order to solve the problems seen in the above conventional technology. In order to achieve this purpose, an opening in the case of electrical equipment is used. In a grommet made of rubber-like elastic material that is press-fitted into the lead wire outlet, the grommet A potting agent is introduced between the grommet and the case on the outer peripheral surface of the grommet. To provide a grommet characterized by being provided with a potting agent introduction groove.

[0005]

[Effect]

A potting agent introduction groove is provided on the outer peripheral surface of the grommet, and the potting agent introduction groove Introduce the potting agent into the gap between the grommet and the case, and Seal between the grommet and the case using a sealing agent.

[0006]

【Example】

Next, embodiments of the present invention will be described with reference to the drawings.

[0007] As shown in Figures 1 to 6, insert the lead wire 2 from the front 6 to the back 7. A required number of through holes 8 are formed on the outer circumferential surface 9 to accommodate the lead wire outlet portion 3 of the case 1. An engagement groove 10 that engages with the edge is formed. Similarly, from the engagement groove 10 on the outer peripheral surface 9 A required number (four in the figure) of potting agent introduction grooves 11 are formed near the back surface 7. It is. The potting agent introduction groove 11 is parallel to the through hole 8 and straight to the engagement groove 10. The potting agent introducing groove 1 is formed deeper than the engaging groove 10. 1 to the gap 12 between the grommet 5 and the case 1. The potting agent 4 seals between the grommet 5 and the case 1. However, According to this configuration, the grommet 5 is deformed when the lead wire 2 is pulled or the like. or if there are dimensional variations in the size of the lead wire outlet 3 of case 1. Even if the grommet 5 and the case 1 are sealed, the potting agent 4 seals the gap between the grommet 5 and the case 1. can do.

[0008] The rising portion 13 forming the side wall on the front side 6 of the engagement groove 10 is formed into a lip as shown in the figure. The tip of the lip 14 is brought into pressure contact with the case 1, and a space is created inside the lip 14. 15, and the potting agent is introduced into this space 15 from the potting agent introduction groove 11. A potting agent 4 is introduced, and this potting agent 4 creates a seal between the grommet 5 and the case 1. to call. In this way, a large amount of potting agent 4 can be applied to grommet 5 and case 1. The sealing performance can be further improved because the sealing property is introduced between the Also space 1 Even if the potting agent 4 is not completely filled in the lip 14 Because it can be expected to have a sealing effect as a lip-type seal, This allows the sealing performance to be further improved.

[0009] Regarding the type of potting agent 4, the material of grommet 5 or the case 1 By selecting a material with adhesive properties, the potting agent 4 can be used to Met 5 and case 1 can be integrated, and in this case, the sealing performance is perfect. Ru.

0010

[Effect of the idea]

The present invention has the following effects. In other words, potting agent is applied to the outer circumferential surface of the grommet. An introduction groove is provided, and from the potting agent introduction groove to the gap between the grommet and the case. Introduce the potting agent and use the potting agent to connect the grommet and the case. Due to the seal, the grommet may become deformed due to the lead wire being pulled. or when there are dimensional variations in the size of the lead wire entry part of the case. Even if there is a sealing effect, the sealing performance can be improved compared to conventional technology. Ru.

[Brief explanation of drawings]

[Fig. 1] Front view of a grommet according to an embodiment of the present invention.

[Figure 2] A-A sectional view in Figure 1

[Figure 3] Plan view of the grommet

[Figure 4] Side view of the grommet

[Figure 5] BB sectional view in Figure 4

[Figure 6] Enlarged cross-sectional view of main parts of the grommet

[Figure 7] Perspective view of the case with grommet installed

[Figure 8] Cross-sectional view of the case with grommet installed

[Fig. 9] Plan view of a grommet according to a conventional example

[Figure 10] CC sectional view in Figure 9

[Fig. 11] Enlarged sectional view of main parts of the grommet

[Explanation of symbols]

1 case 2 Lead wire 3 Lead wire outlet 4 Potting agent 5 Grommet 6 Front 7 Back 8 Through hole 9 Outer surface 10 Engagement groove 11 Potting agent introduction groove 12 Gap 13 Rising part 14 Lip 15 Space

Claims (1)

[Scope of utility model registration request] Claim 1: A grommet 5 made of a rubber-like elastic material that is press-fitted into a lead wire outlet 3 opened in a case 1 of an electrical device.
A grommet characterized in that a potting agent introduction groove 11 for introducing a potting agent 4 between the grommet 5 and the case 1 is provided on the outer peripheral surface 9.