JPH0332337A - Drainage tube - Google Patents

Abstract

PURPOSE:To prevent direct intrusion of water into a tubular section by providing a flexible tubular section having a water discharge port at the tip and a fixing section at the other end, and projecting sections such that the tip side of the tubular section inclines toward the center of the tubular section and further providing a part inclining reversely from the fixing section. CONSTITUTION:A drainage tube 1 is formed integrally with a tubular section 2 and first and second projecting sections 3, 4 by pouring flexible material and removing the mold upon finish of molding. The tubular section 2 is provided with a fixing section 21 at the upper end side and an inclining section 22 at the tip side, where the inclining section 22 inclines with predetermined angle toward the center of the tubular section 2 and the tip part is projected farther than the center of the tubular section 2 so that a water discharge port 24 is opened at a position shifted to the right from the center of the tubular section 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drain tube for a rotating electric machine such as an electric motor or a generator.

[Prior Art] In Japanese Patent Application Laid-Open No. 63-240345, when the car body is exposed to water from below and the water tries to enter from the open end of the cylindrical part, the thin wall of the second protruding part due to elasticity A water drain tube is disclosed that prevents water from entering a rotating electric machine such as a starter by covering a water entry passage by abutting a first projecting part.

[Problems to be Solved by the Invention] However, in the conventional drain tube described above, when the thin wall portion of the second protruding portion receives continuous direct impact water, the thin wall portion is flexible and easily deforms. Excessive deformation due to the force of
There was a possibility that it might change. For this reason, there is a problem in that the thin wall portion of the second protrusion moves beyond the first protrusion and upwards from the first protrusion, thereby opening a passage for water to enter. Therefore, if this water drain tube is used as a water drain tube for a rotating electrical machine such as an electric motor or a generator, water may enter the rotating electrical machine, resulting in a decrease in the insulation properties of the insulating parts and lubrication of the interlocking parts. There was a possibility that problems such as defects would occur.

An object of the present invention is to provide a drainage tube that reliably prevents direct water from entering into a cylindrical portion.

[Means for Solving the Problems] The drainage tube of the present invention includes a flexible cylindrical portion having an outlet for discharging water at its tip and an attachment portion attached to a rotating electric machine at the other end, and the cylindrical portion. a protrusion protruding from the inner circumferential surface of the cylindrical portion toward the center of the cylindrical portion, the tip end of the cylindrical portion being inclined toward the center of the cylindrical portion, It has an inclined portion inclined in a direction opposite to the direction.

[Function] When the tip of the cylindrical portion is directly hit by water, the water collides with the inclined portion provided around the tip of the cylindrical portion. Direct water that collides with the inclined part of the cylinder part scatters outward of the inclined part of the cylinder part.

At this time, the sloping part of the cylinder receives force from the direct water, so the isotropic cylinder, which is flexible and easily deformed, deforms, and the outlet provided at the tip of the cylinder moves to a position that avoids the direct water. do.

[Effects of the Invention] When the tip of the cylindrical portion receives direct impact water, the discharge port moves to a position where it avoids the direct impact water, so it is possible to reliably prevent direct impact water from entering through the discharge port.

[Example] The drainage tube of the present invention will be explained based on the example shown in the drawings.

1 to 3 show a first embodiment of the invention. 1st
Figures 1 and 2 show a water drain tube of a starter that drains water accumulated due to condensation or the like inside a starter installed in an automobile and supplies air to the inside of the starter.

This drainage tube 1 is integrally formed by pouring a visible member such as synthetic rubber into a mold (not shown), shaping the bottom, and then pulling out the mold.

Further, the drain tube 1 includes a cylindrical portion 2, a first protruding portion 3, and a second protruding portion 4.

The cylindrical part 2 has a starter (not shown) on the outer periphery of the upper end in the figure.
A mounting portion 21 is provided to be mounted to the.

Further, the cylindrical portion 2 is provided with an inclined portion 22 at the lower end (in the figure) where the tip thereof is bent.

This inclined portion 22 is inclined at a predetermined angle (acute angle) with respect to the center line of the cylinder portion 2 toward the center of the cylinder portion 2 . The inclined portion 22 is inclined in a direction opposite to the direction of the mounting portion 21 (downward in the drawing). Also,
The tip portion of the inclined portion 22 is provided to protrude beyond the center of the cylindrical portion 2.

Furthermore, a discharge passage 23 through which water flows from the upper end in the drawing toward the lower end in the drawing is formed inside the cylinder portion 2 . Moreover, a semicircular discharge port 24 is provided at the tip of the cylindrical portion 2 for discharging water flowing inside the discharge passage 23 to the outside.

The opening area of the distal end of the discharge passage 23 is gradually reduced toward the distal end by the inclined portion 22. The discharge port 24 normally opens toward the ground, and also opens at a position eccentric to the right in the figure from the center of the cylindrical portion 2.

In this embodiment, the length of the cylindrical portion 2 without a protrusion from the lowermost first protrusion 3 to the second protrusion 4 is as follows:
By making the diameter 1.5 times or more of the diameter of the cylindrical portion 2, the cylindrical portion 2 becomes extremely flexible and easily deformable.

The first protruding portion 3 has a semicircular shape and protrudes toward the center from the inner circumferential surface of the cylindrical portion 2, and is provided in a direction perpendicular to the inner circumferential surface of the cylindrical portion 2. A plurality of first protrusions 3 are provided alternately on the inner circumferential surface of the cylindrical portion 2 facing each other in the radial direction, and form the discharge passage 23 in a labyrinth shape.

The second protruding portion 4 has a semicircular shape and is provided on the inner circumferential surface of the cylindrical portion 2 radially facing the position where the inclined portion 22 of the cylindrical portion 2 is formed. Further, the second protruding portion 4 protrudes from the inner circumferential surface of the cylindrical portion 2 toward the center, and is attached to the discharge port 24 at a predetermined angle (acute angle) with respect to the inner circumferential surface of the cylindrical portion 2. It is sloping towards.

Furthermore, the tip portion of the second protruding portion 4 is provided so as to extend beyond the center of the cylindrical portion 2 and overlap with the tip portion of the inclined portion 22 of the cylindrical portion 2 . Therefore, the second protruding portion 4, together with the inclined portion 22 of the cylindrical portion 2, forms the discharge passage 23 in a labyrinth shape to prevent water from entering from below in the figure.

The function of the drain tube 1 of this embodiment will be explained based on the drawings.

As shown in FIG. 3, when direct water hits the sloping part 22 of the cylindrical part 2 from below, the sloping part 22 of the cylindrical part 2 is slanted, so the water is scattered diagonally to the left in the drawing. .

At this time, since the cylindrical part 2 is made of a flexible member and is flexible and easily deformable, when it receives the force F of the direct water, the cylindrical part 2 moves in the opposite direction to the direction of splashing water. be bent in the direction

Therefore, by moving the discharge port 24 provided at the tip of the cylindrical portion 2 to the right in the figure to avoid direct water impact,
The discharge port 24 opens in the illustrated toll direction.

Further, the larger the force F of the direct hit water, the more the cylindrical part 2 is bent in the direction opposite to the direction of the splashing water, and the more the direct hit water is continuous, the more the discharge port 24 moves to avoid the direct hit water. do. Therefore, the discharge passage 23 of the cylindrical portion 2 from the discharge port 24
It is possible to reliably prevent water from entering the interior.

Furthermore, since the water that hits the inclined portion 22 of the cylindrical portion 2 scatters without entering the discharge passage 23 of the cylindrical portion 2 from the discharge port 24, the water-covered area within the discharge passage 23 of the cylindrical portion 2 is reduced. can be reduced.

Therefore, by attaching the water drain tube 1 of this embodiment to the starter, even if the car is exposed to water from below while driving or washing the car, water can be prevented from entering the starter, and the insulating part It is possible to reliably prevent problems such as a decrease in the insulation properties of the motor and poor lubrication of interlocking parts.

4 and 5 do not show the 2.3 embodiment of the multi-part drainage tube.

(Same functional objects as in the first embodiment are given the same number S.) In the first embodiment, the cylindrical portion 2 of the water drain tube 1 was formed integrally, but in the second and third embodiments, the water drain tube 1 was formed integrally. One cylindrical portion 2 is formed from a plurality of parts. A conical part 5 or an inclined part 6 made of a hard material (resin, etc.) is attached to the tip of the cylindrical part 2. In this way, the same effects as in the first embodiment can be obtained by using the drain tube 1 from a plurality of parts.

[Other Example 1 In this example, the water drain tube of the present invention was used in a starter, but the water drain tube of the present invention may also be used in electric motors other than starters, and may also be used in rotating electric machines such as generators. It's okay.

In this embodiment, the first protrusion and the second protrusion are used as the protrusion, but only the first protrusion or the second protrusion may be used as the protrusion.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show a water drain tube of a starter employed in a first embodiment of the present invention. Figure 1 shows the drain tube. A cross-sectional view, FIG. 2 is a front view showing the drain tube, and FIG. 3 is an explanatory view of the function of the drain tube. FIG. 4 is a cross-sectional view showing a drainage tube made up of multiple parts adopted in the second embodiment of the present invention, and FIG. 5 is a cross-sectional view showing a drainage tube made up of multiple parts adopted in the third embodiment of the invention. FIG. In the figure 1... Drainage tube 2... Cylinder part 3... Second
Projection part 4...Second projection part 5...Conical part 6...Inclination part 22...Inclination part 24...Discharge port

Claims (1)

[Scope of Claims] 1) A flexible cylindrical part having an outlet for discharging water at its tip and a mounting part to be attached to a rotating electric machine at the other end; a protruding portion protruding toward the center, and the tip end of the cylindrical portion is inclined toward the center of the cylindrical portion and is inclined toward the opposite direction with respect to the mounting portion direction. A drainage tube characterized in that it has a sloped portion.