JPH0436192Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a transmission case cable extraction device that has an improved part for extracting cables such as electric wires from inside the transmission case. It is related to.

(Prior Art) A conventional cable extraction device will be explained with reference to FIG. 4. Reference numeral 1 refers to a case (mission case).
The same applies hereafter), and the transmission is housed inside. This case 1 is provided with a hole 2, into which is fitted a ring 5 having a groove 3 formed on its outer periphery and an O-ring 4 fitted into the groove 3. A recess 6 is provided in the upper part of the groove 3 in the ring 5, and the tip of a stopper 8 whose base is supported on the case 1 by a screw 7 is engaged with the recess 6. The inside of the ring 5 is filled with a filler 9 made of adhesive or rubber material, and the electric wire 10 is supported by this filler 9.

(Problem that the invention aims to solve) In the conventional cable extraction device with this structure, only the O-ring 4 is used to prevent the oil (lubricating oil) inside the case 1 from leaking outside. Therefore, the hole 2 in the case 1 must be precisely finished. Therefore, there was a problem in that the processing and assembly were complicated. The present invention was made with the aim of solving this problem.

(Means for Solving the Problem) As a means for solving the above-mentioned problem, the present invention provides a case with a protrusion in the vicinity of the lower opening, in which the upper part is expanded relative to the lower part. At the same time, a thick boss part is integrally molded around the hole, a screw hole is formed on the outer surface of the boss part, and a cable insertion hole is provided below the hole. A plate is locked, a rubber bushing having a thickness slightly thicker than the depth of the hole and having a cable insertion hole therethrough is placed on the upper part of the lower plate, and a presser foot having the cable insertion hole is placed on the upper part of the rubber bushing. Place the board
A screw in which a cable extending from the inside of the case to the outside is inserted through each cable insertion hole in the lower plate, the rubber bushing, and the holding plate, and the rubber bushing is pressed by a holding plate from above to form the holding plate in the boss portion. It is fixed to the case with a screw that screws into the hole.

(Function) With this configuration, when the rubber button is pressed by the presser plate, the rubber button deforms in the direction of pressing against the inner wall of the hole in the case and in the direction of tightening the cable, so the hole in the case is not precisely finished. Even without it, sufficient liquid tightness can be maintained.

(Example) An example of the present invention will be described below with reference to FIG.
The same members as in FIG. 4 are given the same numbers.The hole 2 of the case 1 has a widened upper part, and the lower part of the hole 2 has an inward protrusion 2a.
is formed. And on this protrusion 2a, a second
As shown in the figure, a lower plate 11 having a cable insertion hole 11a in the center is locked. As shown in FIG.
A rubber bushing 12 is placed which has a cable insertion hole 12a at a position that matches the cable insertion hole 11a, and whose thickness is slightly thicker than the depth of the hole 2. 13a is placed, and the case 1
A thick boss portion 1a integrally formed around the hole 2 of
The case 1 is fastened to the case 1 with a screw 14 that is screwed into a screw hole 1b formed in the case 1.

This cable extraction device configured in this way takes out the electric wire 10 from the inside of the case 1 to the outside, and connects it to each cable insertion hole 11a, 12a, 13a.
penetrate. As a result, the lower plate 11, rubber bushing 12, and presser plate 13 are stacked in the order shown. Therefore, when the presser plate 13 is fastened and fixed to the case 1 with the screws 14, the rubber bush 1 whose thickness is thicker than the depth of the hole 2 is formed.
2 is in pressure contact with the inner wall of the hole 2 and the direction in which the electric wire 10
deforms in the direction of tightening, increasing the liquid tightness inside and outside the case.

(Effects of the invention) Since the present invention is configured as explained above, it has the following effects.

With a simple structure consisting of just a rubber bush and a plate, it reliably seals the oil inside the case and allows the cable to be taken out of the case.

When the presser plate is fastened to the case, the rubber bush deforms in the radial direction to form a seal, so the machining accuracy of the holes in the case can be as small as the dimensional tolerance of die casting.

By controlling the thickness of the rubber bush and the depth of the hole in the case, the amount of deformation of the rubber bush can be kept within a certain limit, so the reliability of assembly with the rubber bush can be increased.

The shape of the hole is tapered, with the upper part widening relative to the lower part, and the inner opening is smaller than the outer opening, so the force applied to the opening from inside the container is small. The stress for receiving this force is dispersed by the outer presser plate, which is wider than the inner opening, and it is possible to withstand high pressure.

The shape of the hole is tapered, with the upper part expanding relative to the lower part, and the rubber bushing receives pressure inward from the slope of the hole, so the contact surface between the rubber bushing and the hole, and the cable insertion A strong clamping force will be applied to the hole. As a result, sealing performance is significantly improved.

From the perspective of maintaining confidentiality, this structure is ideal because it is simple and avoids the need to drill screws that communicate with the inside of the container. Since it can be easily processed from the outside, it leads to improvements in processability and processing system.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a plan view of the lower plate, Fig. 3 is a plan view of the holding plate, and Fig. 4 is a sectional view of an example of a conventional cable extraction device. . 1... Case, 2... Hole, 10... Electric wire, 11
... Lower plate, 11a, 12a, 13a ... Cable insertion hole, 12 ... Rubber button, 13 ... Holding plate, 14 ... Screw.

Claims (1)

[Scope of utility model registration request] The case is provided with a hole in which the upper part is expanded relative to the lower part and has an inwardly protruding shape near the lower opening, and a thick boss part is integrally molded around the hole. A screw hole is formed on the outer surface of the boss part, a lower plate having a cable insertion hole is fixed to the lower side of the hole, and the upper part of the lower plate has a thickness slightly thicker than the depth of the hole. , a rubber bushing having a penetrating cable insertion hole is placed thereon, a holding plate having a cable insertion hole is placed on top of the rubber bushing, and a cable extending from the inside of the case to the outside is placed on the lower plate,
The cable insertion holes of the rubber bushing and the holding plate are inserted, the rubber bushing is pressed from above with the holding plate, and the holding plate is fixed to the case with screws that are screwed into the screw holes formed in the boss portion. The cable extraction device of the transmission case is a feature.