JPH0627827Y2 - Drainage structure of vehicle starter motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a water draining structure for draining water in a solenoid housing to which a solenoid switch of a starter motor is attached.

<Prior Art> As a conventional example of a drainage structure of a starter motor, there is one as shown in FIGS. 5 and 6 (see Japanese Utility Model Publication No. 58-8940).

First, the outline of the starter motor will be described with reference to FIG. 5. The front case 1 is attached to the engine housing 2. A large-diameter first cylindrical opening 1a and a second cylindrical opening 1b having a smaller diameter than the first cylindrical opening 1a are formed outside the engine housing 2 of the front case 1. Further, a cutout opening 1c into which a ring gear is fitted is formed inside the engine housing 2 of the front case 1.

A motor portion is fitted in the first tubular opening portion 1a of the front case 1, and a solenoid switch 4 is fitted in the second tubular opening portion 1b.

Here, the second cylindrical opening 1b of the front case 1
As shown in FIG. 6, a drainage groove 5 is formed in the side wall by being bent in the radial direction, and water that enters the starter motor through the drainage groove 5 is discharged to the outside while the tire is scratched. The raised mud is prevented from flowing back from the drain groove 5 into the starter motor.

Further, as another conventional example, as shown in FIG. 7, there is one in which a drain groove 6 is linearly extended in the radial direction on the side wall of the first cylindrical opening 1a of the front case 1.

<Problems to be Solved by the Invention> However, in such a conventional drainage structure, since bent or linear drainage grooves 5 and 6 are formed in the mounting side wall of the solenoid switch 4 of the front case 1, There was a problem.

That is, since the passage lengths of the drainage grooves 5 and 6 are short and have a simple structure, there is a problem that water easily flows backward from the outside into the starter motor through the drainage grooves 5 and 6. Further, since the drainage grooves 5, 6 are formed in the side wall of the front case 1 to which the solenoid switch 4 is attached, the weight of the solenoid switch 4 acts on the side wall thereof, so that the drainage grooves 5, 6 are prevented in order to prevent cracks or the like. However, there was a problem in that it could not be formed with a sufficient width and a sufficient drainage effect could not be secured.

The present invention has been made in view of such circumstances, and an object thereof is to provide a drainage structure of a starter motor for a vehicle, which can prevent water from entering from the outside and ensure a sufficient drainage effect.

<Means for Solving the Problems> Therefore, the present invention has a hollow front case whose one end is attached to an engine housing or a transmission housing, and a hollow front case which is formed at the other end of the front case and to which a motor unit is attached. And a hollow solenoid housing formed at the other end of the front case adjacent to the motor housing and having a solenoid switch attached thereto. And a notch portion formed by notching the solenoid housing, the solenoid housing protruding from the motor housing below the notch portion toward the shank, and the upper joint surface disposed at a position lower than the bottom surface of the solenoid housing. A protruding portion, a joint surface of the protruding portion, and the cutout portion A dust cover formed of an elastic member that is attached to the cutout portion to cover the bottom surface of the solenoid housing and the communication path that communicates with the outside of the solenoid housing. did.

<Action> In this way, the water in the solenoid housing is discharged to the outside through the communication passage, while the passage length of the communication passage is lengthened and a maze structure is formed to prevent water from entering the solenoid housing from the outside. I decided to do it.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, one end of a hollow cast metal front case 11 is attached to a rear end of a cylinder block of an engine, a front end of a transmission, etc. (not shown) through front case mounting bolt holes 11A.

A solenoid housing 12 is integrally formed at the other end of the front case 11, and a solenoid switch (not shown) is mounted on a mounting surface 12A of the solenoid housing 12 via a solenoid mounting bolt hole 12B. A motor housing 13 is integrally formed at the other end of the front case 11 so as to be adjacent to the solenoid housing 12, and an opening of the solenoid housing 13 is provided with a motor portion (not shown) through a motor mounting bolt hole 13A. Can be installed. Here, the motor housing 13 is formed so as to project from the solenoid housing 12 toward the other end of the front case 11.

A notch 14 is formed in the solenoid housing 12 of the motor housing 13, and an upper end 15 and a lower end 16 are formed in the motor housing 13 so as to face each other through the notch 14. . A projecting portion 17 is integrally formed on the outer wall of the lower end portion 16 by projecting a predetermined amount of the solenoid housing 12 into the crocodile, and a flat joint surface 18 is formed on the upper surface of the projecting portion 17. There is. Here, the joint surface 18 is formed so as to be located at a position lower than the mounting bottom surface 19 of the solenoid housing 12, and a step is formed at the connecting portion between the joint surface 18 and the mounting bottom surface 19. In addition, a water drainage hole 20 is formed in the protruding portion 17 so as to linearly penetrate downward from the substantially central portion of the joint surface 18.

The notch 14 has a dust cover 21 made of an elastic member,
As shown in FIGS. 2 to 4, it is fitted and inserted, and the dust cover 21 is sandwiched by the upper end portion 15, the lower end portion 16 and the joint surface 18. The dust cover 21 is formed in such a shape that it is aligned with the cutout portion 14 so as to form a part of the motor housing 13 and is aligned with the outer walls of the motor portion and the solenoid switch. Further, at the lower end of the dust cover 21 that abuts against the abutting surface 18, a drainage groove 22 as a communication passage is provided, and one end of the drain cover 22 is made to communicate with the drainage hole 20 while the other end is provided as shown in FIG. It is formed in communication with the bottom of the solenoid housing 12.

According to this structure, the water in the solenoid housing 12 flows into the water drain groove 22 and then is discharged to the outside from the water drain groove 20 as shown by the arrow in FIG. At this time, since the drain groove 22 is formed between the joint surface 18 of the protruding portion 17 and the dust cover 21, the passage length is significantly longer than that of the conventional example, and the joint surface 18 and the bottom surface 19 are A step is formed and the passage becomes a maze structure. Therefore, it is possible to prevent water from entering the inside of the solenoid housing 12 through the drain groove 22 from the outside, and thus prevent rusting of the contacts of the solenoid switch. Further, since almost no external force acts on the dust cover 21 in which the drainage groove 22 is formed, the passage cross-sectional area of the drainage groove 22 can be increased, and thus the drainage effect can be greatly improved. Further, since the water drainage hole 20 is formed in the protruding portion 17 of the motor housing 13, the water drainage hole 20 can be processed very easily without lowering the strength of the motor housing 13. Further, since the water drain groove 22 is formed in the dust cover 21 made of an elastic member, grooves of various shapes can be easily formed.

<Effect of the Invention> As described above, according to the present invention, since the communication passage is formed between the dust cover and the protruding portion protruding from the motor housing, the water inside the solenoid housing is discharged to the outside to enhance the drainage effect. While water can be discharged while it is being discharged, it is possible to prevent water from flowing back into the solenoid housing from the outside.

[Brief description of drawings]

1 is an exploded view showing an embodiment of the present invention, FIG. 2 is a left side view of the same as above, FIG. 3 is a bottom view of FIG. 2, FIG. 4 is a perspective view of the same as above, and FIG. FIG. 6 is a side view showing a conventional example, FIG. 6 is a sectional view of an essential part of the same, and FIG. 7 is a sectional view of an essential part showing another conventional example. 11 …… Front case, 12 …… Solenoid housing,
13 …… Motor housing, 14 …… Notch, 18 …… Joint surface, 19 …… Bottom surface, 20 …… Drain hole, 21 …… Dust cover,
22 …… Drainage groove

Claims (1)

[Scope of utility model registration request] 1. A hollow front case having one end attached to an engine housing or a transmission housing, a hollow motor housing formed at the other end of the front case to which a motor is attached, and adjacent to the motor housing. A hollow solenoid housing formed at the other end of the front case and to which a solenoid switch is attached, in a vehicle starter motor, wherein the solenoid housing of the motor housing is formed by cutting out a part of the notch. A projection portion formed such that the solenoid housing protrudes from the motor housing below the cutout portion toward the wall and the upper joint surface is arranged at a position lower than the bottom surface of the solenoid housing, and the projection portion. The cutout portion covering the joint surface of the installation portion and the cutout portion For a vehicle, comprising: a dust cover made of an elastic member to be attached; and a communication passage formed at a joint between the dust cover and the projecting portion and connecting the bottom of the solenoid housing to the outside. Drainage structure of starter motor.