JPH0145241Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a generator for an automobile, and particularly aims to provide a structure for an automobile generator that can improve the durability of the slip spring.

``Prior Art'' An automobile engine is generally mounted to a vehicle body 1 in a backward downward position, as shown in FIG.
For this reason, the generator 3 attached to the engine 2 is also placed in a backward downward position.

A passive pulley 4 is attached to the front end of the generator 3, and a belt is hung from the rotating shaft of the engine 2 to drive the generator 3. Since the front end of the automobile generator 3 has a structure in which a belt is applied to receive passive pressure, a large and highly durable bearing is used at the front end. On the other hand, the rotating shaft of the generator 3 does not receive a large force on the rear end side, so a small bearing is sufficient.

For this reason, the slip ring used in the generator 3 is provided on the rear end side of the generator 3.

Figure 2 shows the structure of the part of the generator 3 that accommodates the slip ring. In the figure, 5 is a slip ring, 6
indicates the bearing on the rear end side. slip ring 5
is housed in a chamber 8 formed by being covered by a housing 7 to prevent water from splashing on it from the outside.

``Problems to be solved by the invention'' In conventional automobile generators, the slip ring 5 is housed in a chamber 8 formed by being covered by a housing 7, so the temperature inside the chamber 8 increases significantly. This deteriorates the durability of the slip ring 5.

In other words, in order to lower the temperature inside the chamber 8, it is conceivable to form a gap G between the chamber 8 and the outside, and to allow air to flow through this gap G to dissipate heat. However, if the gap G between the chamber 8 and the outside is made large, moisture easily enters from the outside, resulting in a disadvantage that the humidity inside the chamber 8 becomes high. If the humidity in the room 8 increases, the life of the slip ring 5 will be further shortened due to the high temperature and humidity. Moisture is in the form of water spray generated from tires while the vehicle is running, and it is easy for it to enter even through small gaps.

Because of these contradictory conditions, conventionally chamber 8
Although the gap G between the inside and the outside is made small to prevent moisture from entering, the gap G cannot be completely eliminated because the heat dissipation path cannot be reduced to zero as explained earlier. A slight ingress of water into chamber 8 is therefore unavoidable. However, the slight amount of moisture that has entered tends to accumulate on the bottom surface 9 of the chamber 8.
Since the generator 3 is installed in a downward facing position, it is difficult for the moisture accumulated on the bottom of the chamber 8 to be discharged to the outside, and the moisture in the chamber remains constantly high. The disadvantage is that the lifespan is shortened.

The purpose of this invention is to extend the life of the slip ring in an automobile generator that is installed on the vehicle body in a backward downward position and has a slip ring installed at the rear end of the housing. The purpose is to provide a structure for a generator for

"Means for Solving the Problem" A rotating shaft protrudes from the front end side of the housing, a passive pulley is attached to the protruding rotating shaft, rotational force is applied from the engine to the passive pulley, and the inside of the housing is It has a structure in which a generator housed in the housing is driven to generate electricity, and the housing is attached to the vehicle body in a backward downward position with the driven pulley side facing upward, and the rotating shaft is located at the front end of the housing. A chamber is surrounded by the housing adjacent to the small diameter bearing provided at the rear end of the housing. In an automobile generator having a structure in which a slip ring which is attached to a rotating shaft and rotates is housed in this chamber, a drainage hole is provided at the bottom of the rear end side of the chamber formed in the housing and which houses the slip ring. The structure is such that a pipe is connected to this drainage hole and projects outward from the chamber housing the slip ring to prevent water from entering.

"Example" FIG. 3 shows an example of this invention. In FIG. 3, parts corresponding to those in FIG. 2 are designated by the same reference numerals. In this invention, a drainage hole 11 is formed in the bottom surface 9 of a chamber 8 formed in the housing surrounding the slip ring 5. This drainage hole 11 is connected to the generator 3
It is formed at the lowest side of the bottom surface 9, that is, at the rear end of the bottom surface 9 due to the downward downward posture.

The drain hole 11 is further provided with a pipe 12 to prevent water from entering from outside. The tube 12 for preventing water from entering can be constructed from a flexible tube. The length of the tube is selected to be at least twice the diameter.

"Effects of the Invention" According to the structure of this invention described above, in an automobile generator having a structure in which the slip ring 5 is housed in the chamber 8 formed in the housing, the chamber 8 in which the slip ring 5 is housed has a drainage hole. It is communicated with the outside air through 11. Therefore, ventilation is performed through this drain hole 11, and a rise in temperature within the room 8 can be suppressed. In other words, even if the conventionally provided gap G is sealed, ventilation can be performed, and a rise in temperature within the room 8 can be suppressed.

Further, even if water enters through the drain hole 11, the water is immediately drained through the drain hole 11. Therefore, even though the generator is installed in a downward facing position, there is no situation where water remains at the bottom of the chamber 8 forever, so the humidity inside the chamber 8 does not become high.

Furthermore, since the pipe 12 is attached to the drain hole 11 to prevent water from entering, the amount of water entering the chamber 8 can be reduced. In other words, if a flexible tube is used as the pipe 12, the tube will bend when hit by strong car wash water, and water will not be injected into the chamber 8. Furthermore, mist-like water such as water spray generated from tires often adheres to the inner wall of the tube when passing through the tube. Therefore, the amount of mist moisture entering the chamber 8 can be reduced.

As described above, the structure according to this invention can suppress the rise in temperature in the chamber 8 and also suppress the rise in humidity, thereby extending the life of the slip ring 5 and providing a highly durable automobile generator. can.

In the above example, a flexible tube was used as the pipe 12 to prevent water from entering the drain hole 11, but as another example, the hole 11 could be formed in the housing itself forming the bottom surface 9. A cylindrical body may be formed to protrude so as to surround the chamber 8, and the cylindrical body may be configured to prevent water for car washing or the like from being directly injected into the interior of the chamber 8.

[Brief explanation of the drawing]

Figure 1 is a side view to explain how the engine is installed in a car, Figure 2 is a sectional view to explain the structure of a conventional car generator, and Figure 3 is a side view to explain the main parts of this invention. It is an enlarged sectional view of a part. 1... Vehicle body, 2... Engine, 3... Generator,
4... Pulley, 5... Slip ring, 7... Housing, 8... Chamber housing the slip ring,
9...Bottom surface, 11...Drain hole, 12...Pipe for preventing water from entering.

Claims (1)

[Claims for Utility Model Registration] A. A rotating shaft protrudes from the front end side of the housing 7, a passive pulley 4 is attached to the protruding rotating shaft, rotational force is applied to the passive pulley 4 from the engine, and the above-mentioned The generator 3 housed inside the housing 7 is driven to generate electricity, and the housing 7 is attached to the vehicle body 1 in a backward downward position with the driven pulley side facing upward. The bearing is supported by a large diameter bearing provided on the front end side of the housing and a small diameter bearing 6 provided on the rear end side of the housing. A generator 3 for an automobile has a structure in which a chamber 8 surrounded by the housing 7 is formed adjacent to the housing 7, and a slip ring 5 that is attached to the rotating shaft and rotates is housed in the chamber 8, B. A drain hole 11 formed in the bottom surface 9 on the rear end side of the chamber 8, and a pipe 12 connected to the drain hole 11 and projected outside the chamber 8 to prevent water from entering.
An automobile generator comprising the following.