JPS61121738A - Drainage - Google Patents

Abstract

PURPOSE:To make the dimentional error of a fitted unit negligible, by a method wherein the salient section of a drain tube which is more flexible than a connecting member is provided between the salient section of the connecting member and the fitted unit. CONSTITUTION:A salient section 3a is formed on the inner peripheral side of the end frame 2 side end section of a drain tube 3,and the wideth of the salient section 3a is arranged to be slightly larger than a space between the end frame 2 and a sub-salient section 4c. the inner periphery of the salient section 3a is butt-jointed to the outer periphery of the cylinder section 4a of a connecting member 4. The sub-salent section 4c of the connecting member 4 is inserted into the groove 3b of the drain tube 3, and the salient section 3a is inserted between the sub-salient section 4c and the end frame 2, and the tube 3 is fixed in the drain hole 2a of the end frame 2 to be press-jointed. Accordingly, the dimensional error of a fitted unit can be made negligible due t the salient section 3a.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to, for example, a water draining structure for a starter motor.

[Conventional technology]

The conventional one is Nippondenso public branch axis, serial number 29-118
(Publication date: January 20, 1983), the end of a drainage tube made of rubber or plastic has a first protrusion that protrudes in the outer radial direction, and
A second protrusion that protrudes in the outer circumference radial direction is formed at a distance approximately equal to the thickness of the end frame that is the attached body, and the drain hole of the end frame is connected to the first protrusion.
A drain hole of the end frame is inserted between the protruding part and the second protruding part, and a drain tube is fixed to this drain hole.

[Problem that the invention seeks to solve]

However, with the conventional products mentioned above, due to dimensional errors, etc.
If the thickness of the end frame becomes larger than the distance between the first protrusion and the second protrusion, if a flexible material such as rubber is used, the first. Since the second protrusion deforms and warps outward in the axial direction, there is a problem that the drain tube may come out. Also, if a relatively hard material such as plastic is used, 1. There is a problem in that the second protrusion is broken.

Therefore, the present invention is to reliably attach a drain tube to a drain hole.

[Means for solving problems]

A connecting member having an attached body having a drain hole formed therein, a cylindrical portion that substantially contacts the inner periphery of the drain hole, and protruding portions that respectively protrude toward the outer circumferential radial direction of both ends of the cylindrical portion. and disposed between the protrusion and the object to be attached,
A draining structure comprising: a draining tube having a projecting portion slightly larger than the distance between the projecting portion and the attached body at the end thereof and having more flexibility than the connecting member; It is.

[For production]

Since the projecting portion of the drain tube, which is more flexible than the connecting member, is sandwiched between the projecting portion of the connecting member and the object to be attached, slight dimensional errors can be absorbed by the projecting portion.

(Example〕 The present invention will be described below with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, 5 is a starter, 6 is a magnet switch, and 7 is a starter motor. A drain hole 2a for draining water from the starter motor 7 is formed in the end frame 2 to which the starter motor 7 is attached. 4 is an annular member made of resin, for example, and includes a cylindrical portion 4a that substantially contacts the inner periphery of the drain hole 2a, and a cylindrical portion 4a that protrudes in the outer radial direction from the entire circumference of both ends of the cylindrical portion 4a, and includes an end frame 2. It is composed of a first protrusion 4b disposed inside the end frame 2 and a second protrusion 4C disposed outside the end frame 2. Furthermore, a notch portion 4d is formed at the end portion of the cylindrical portion 4a within the end frame 2. The cutout portion 4d is formed on substantially the same plane as the inner circumferential surface of the end frame 2, so that water in the starter motor 7 can be easily drained. Also, 1st. The second protrusions 4b and 4c are respectively formed with tapered portions 4e and 4f that become smaller in diameter toward the outside in the axial direction.

Reference numeral 3 designates a cylindrical drainage tube, which is made of an elastic body such as rubber, which has more flexibility than the connecting member 1. At the end of the drain tube 3 on the end frame 2 side,
A projecting portion 3a is formed on the inner peripheral side, and this projecting portion 3
The width a is slightly larger than the gap between the end frame 2 and the second protrusion 4C. The inner periphery of the projecting portion 3a is in contact with the outer periphery of the cylindrical portion 4a of the connecting member 4. Further, a truncated conical groove 3b having the same shape as the second protrusion 4C is formed on the side of the protrusion 3a opposite to the end frame 2. Further, projections 3C are alternately formed on the inner periphery of the drain tube 3, and serve to prevent water from splashing into the end frame 2 from the outside. Then, the second protrusion 4c of the connecting member 4 is inserted into the groove 3b of the drain tube 3, and the second protrusion 4C
The tube 3 is fixed to the drain hole 2a of the end frame 2 by inserting the projecting portion 3a between the end frame 2 and the end frame 2 and pressing the tube 3a into pressure contact with the end frame 2.

Therefore, the end frame 2 and the overhanging portion 3 of the tube 3
The sealing property between a and a is good, and dimensional errors in the plate thickness of the end frame 2 can be absorbed by the overhanging portion 3a. Roughly speaking, even if the end frame 2 is not flat but has a slightly curved surface, it can be absorbed by the overhanging portion 3a in the same way. Furthermore, since the projecting portion 3a of the drain tube 3 is pressed between the end frame 2, which is harder than the drain tube 3, and the second projecting portion 4c, the projecting portion 4c of the connecting member 4 is not deformed. , the drain tube 3 is loose. Furthermore, the first protrusion 4b
The connecting member 4 is connected to the end frame 2 by the tapered portion 4e.
The groove 3b of the drain tube can be easily inserted into the second protrusion 4c by the tapered portion 4f of the second protrusion 4G.

In the embodiment described above, the connecting member 4 and the drain tube 3 are connected to the end frame 2 of the starter motor 7.
Although it is used for the drain hole 2a, it can also be used for electric motors used for other purposes, magnetic switches, and devices with drain ports.

〔Effect of the invention〕

As described above, in the present invention, the projecting part of the drain tube, which is more flexible than the connecting member, is pressed and fixed between the attached body and the projecting part of the connecting member. The projecting portion absorbs dimensional errors of the object to be attached, and the protruding portion of the connecting member is less likely to deform, providing excellent effects in that the drain tube can be reliably fixed to the drain hole.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a starter to which an embodiment of the water draining structure of the present invention is applied, and FIG. 2 is an enlarged sectional view of the main parts shown in FIG. 1. 2... End frame forming the object to be attached, 2a... Drain hole, 3... Drain tube, 3a... Overhanging part, 4... Connecting member, 4a... Cylindrical part, 4b , 4c
...1st degree second protrusion.

Claims (1)

[Scope of Claims] An attached body in which a drain hole is formed, a cylindrical portion that substantially contacts the inner periphery of the drain hole, and a protrusion that protrudes toward the outer circumferential radial side of both ends of the cylindrical portion, respectively. a connecting member having a portion, and a connecting member disposed between the protruding portion and the attached body;
A draining structure comprising: a draining tube having a projecting portion slightly larger than the distance between the projecting portion and the attached body at the end thereof and having more flexibility than the connecting member.