JP3936080B2 - Breather for motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a breather for a motor that is applied to prevent condensation within the motor and to discharge water that has entered the motor.
[0002]
[Prior art]
Generally, a hole or a cylindrical breather is provided in a motor case at a position corresponding to the lower part in the vertical direction when the motor is mounted on the motor in order to prevent dew condensation in the motor or to discharge water entering the motor.
In addition, depending on the vehicle mounting position of the motor, strong water exposure from the road is received. If a hole or a normal breather is provided, water enters the motor from the hole and the breather.
[0003]
In order to solve this problem, in Japanese Utility Model Publication No. 7-39260, an L-shaped breather that tries to protect against strong water at the bent part, and in Japanese Utility Model Publication No. 59-28261, the cylinder is divided vertically. There has been proposed a breather in which a plurality of pieces each provided with a plurality of substantially semicircular barriers projecting from each other in the cylinder extending direction from the inner circumference of the cylinder are formed by abdomen.
[0004]
[Problems to be solved by the invention]
However, in the above-described L-shaped breather, the high-pressure water goes around the bent portion and enters the motor in the case of high-pressure washing or the like of the vehicle.
The semicircular barrier breather described above is expensive because it requires two parts and assembly, or the semicircular barriers face each other, so that the direction of mounting the breather is restricted in order to discharge water. End up. Furthermore, if this breather is to be manufactured inexpensively with a single part by molding using an elastic material such as rubber, this barrier is missing from the breather body when the inner mold for molding this semicircular barrier is pulled out of the breather. As a result, the breather becomes expensive.
[0005]
Therefore, the present invention solves the above problems, and provides an inexpensive breather that can be manufactured with one component that does not allow water to enter from the breather even when the motor receives high-pressure water during high-pressure washing of a car or the like. The purpose is to do. Furthermore, an object of the present invention is to improve the yield of the breather, without restricting the mounting direction of the breather.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a breather for a motor made of a cylindrical elastic material provided with a connecting hole for connecting a motor internal air intake port and a breathing port with outside air, and is connected from the inner peripheral surface of the connecting hole. The three or more barrier walls projecting so as to block a part of the holes are separated from each other in the connecting hole extending direction and disposed at different connecting hole circumferential angle positions with a projecting angle of 120 ° or less, The gist is that the projection surface in the extending direction of the connecting hole by the barrier substantially covers the cross section of the connecting hole.
[0007]
The invention according to claim 2 is the motor breather according to claim 1, wherein the number of the barriers is three and the projecting angle with the inner peripheral surface of the connecting hole is approximately 120 °. To do.
[0008]
According to a third aspect of the present invention, in the motor breather according to the first and second aspects of the present invention, the connecting hole small-diameter portion and the L are sequentially formed between the barrier and the internal air intake port toward the intake port. The gist is to provide a bent portion.
[0009]
According to a fourth aspect of the present invention, there is provided a breather for a motor made of a cylindrical elastic material provided with a connecting hole for connecting a motor inside air intake port and a breathing port with outside air, and is connected from the inner peripheral surface of the connecting hole. The barriers protruding so as to block a part of the holes are separated from each other in the direction of extension of the connecting holes and are arranged at different connecting hole circumferential angular positions with a protruding angle of 120 ° or less, and the barrier and the intake of the inside air The gist is that a connecting hole small-diameter portion is provided between the opening and the inlet, and the projection surface in the extending direction of the connecting hole by the plurality of barriers substantially covers the cross-section of the connecting hole small-diameter portion.
[0010]
A fifth aspect of the present invention is the motor breather according to the fourth aspect, wherein there are two barriers and the projecting angle with the inner peripheral surface of the connecting hole is approximately 120 °. To do.
[0011]
[Action]
According to the first aspect of the present invention, the three or more barriers are separated from each other in the connecting hole extending direction and are arranged at different connecting hole circumferential angle positions with a projecting angle of 120 ° or less, Since the projection surface in the extending direction of the connecting hole by the barrier substantially covers the cross section of the connecting hole, it is possible to prevent the intrusion of high-pressure water. In addition, since the projecting angle with the connecting hole of the barrier is set at a small angle of 120 ° or less, even if the breather is manufactured as a single part by molding, the barrier can be prevented from being lost, and the breather becomes inexpensive. .
[0012]
According to the invention of claim 2, in the motor breather according to claim 1, the number of the barriers is three and the projecting angle with the inner peripheral surface of the connecting hole is approximately 120 °. In addition to the above effects, motor intrusion water can be discharged regardless of the mounting direction of the breather.
[0013]
According to a third aspect of the present invention, in the motor breather according to the first and second aspects, the connecting hole small-diameter portion is sequentially disposed between the barrier and the internal air intake port toward the intake port. And the L-shaped bent portion, the entry of high-pressure water can be further prevented.
[0014]
According to the fourth aspect of the present invention, the barrier walls protruding so as to block the connecting hole from the inner peripheral surface of the connecting hole are separated from each other in the connecting hole extending direction, and the protruding angle is set at different connecting hole circumferential angle positions. A connecting hole small diameter portion is provided between the barrier and the intake port for the inside air, and the projection surface in the extending direction of the connecting hole by the plurality of barriers is a connecting hole. Since the cross section of the small-diameter portion is almost covered, high-pressure water can be prevented from entering. In addition, since the projecting angle with the connecting hole of the barrier is set at a small angle of 120 ° or less, even if the breather is manufactured as a single part by molding, the barrier can be prevented from being lost, and the breather becomes inexpensive. .
[0015]
According to the invention described in claim 5, in the motor breather according to claim 4, the number of the barriers is two and the projecting angle with the inner peripheral surface of the connecting hole is approximately 120 °. Motor intrusion water can be discharged regardless of the breather mounting direction.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.
First, the first embodiment will be described with reference to FIGS.
[0017]
FIG. 1 is a cross-sectional view of the breather 20 mounted on the motor according to the first embodiment of the present invention, and FIG. 2 is an enlarged front view as viewed from the direction A in FIG.
1 and 2, 10 is a motor, 12 is an armature of the motor 10, 14 is a first case of the motor 10, 16 is a second case of the motor 10, and 20 is a breather.
[0018]
Here, the breather 20 is made of an elastic material such as a cylindrical rubber having a connecting hole 26 that connects the intake port 22 for the internal air of the motor 10 and the breathing port 24 to the outside air, and from the inner peripheral surface 26 a of the connecting hole 26. Three fan-shaped barriers 28 having a projecting angle of 120 ° projecting so as to block a part of the connecting hole 26 are separated from each other in the extending direction of the connecting hole 26 and 120 ° in the circumferential direction of the connecting hole 26. It is set to deviate. The projecting angle θ referred to here refers to the projecting angle from the inner peripheral surface 26a in the circumferential direction of the barrier 28 with respect to the hole center of the connecting hole 26, as shown in FIG.
[0019]
The breather 20 is provided with a small-diameter portion 29 of the connecting hole 26 and an L-shaped bent portion 27 between the barrier wall 28 and the intake port 22 for the inside air.
[0020]
As described above, according to the configuration of the present embodiment, the projection surface in the extending direction of the connecting hole 26 covers the cross section of the connecting hole 26 by the three barriers 28, thereby preventing entry of high-pressure water from the outside. It becomes possible.
[0021]
Further, since the protruding angle θ of the barrier wall 28 is set to 120 °, the barrier wall 28 is eliminated. This will be described with reference to FIG. FIG. 5 illustrates the increase degree of the length in the y-axis direction joined to the inner peripheral surface 26a of the barrier 28 with respect to the protruding angle θ of the barrier. Since the length in the y-axis direction acts to prevent the barrier wall 28 from falling when the hole-side mold having the barrier-wall 28 forming groove is extracted from the breather 20, the longer the length in the y-axis direction, the easier the barrier wall 28 is lost. As apparent from FIG. 5, when the projecting angle θ exceeds 120 °, the length in the y direction with respect to the projecting angle θ increases abruptly. Therefore, it can be said that the projecting angle θ of the barrier 28 is preferably 120 ° or less. In the actual product, the breather with the protruding angle θ of the barrier wall 28 of 180 ° generates a very large amount of the missing barrier wall 28, but the breather with the protruding angle θ of the barrier wall 28 of 120 ° has the barrier wall 28. This is also clear from the fact that there is no omission and the product yield is high.
[0022]
Further, in the present embodiment, the barriers 28 having a projecting angle θ of 120 ° are shifted at a 120 ° pitch, so that intrusion water can be discharged even if the installation position angle of the breather is shifted, and the installation position of the breather is Not limited.
Further, the small diameter portion 29 and the L-shaped bent portion 27 prevent the high-pressure water from entering more reliably.
[0023]
Next, a second embodiment will be described with reference to FIGS.
FIGS. 3A and 3B are a cross-sectional view of a breather 30 according to a second embodiment of the present invention and a right front view of FIG.
[0024]
The breather 30 is made of an elastic material such as a cylindrical rubber having a connecting hole 36 that connects the intake port 32 for the internal air of the motor 10 and the breathing port 34 to the outside air, and the connecting hole 36 extends from the inner peripheral surface 36 a of the connecting hole 36. Two rectangular barrier walls 38 having a projecting angle of 120 ° protruding so as to block a part of the connecting hole 36 are set apart from each other in the extending direction of the connecting hole 36 and opposed to the circumferential direction of the connecting hole 36 by 180 °. Further, a small-diameter portion 39 of the connecting hole 36 that is covered by the projection surface in the connecting hole extending direction of the two barrier walls 38 facing the intake port 32 between the barrier wall 38 and the inside air intake port 32. Is set.
[0025]
As described above, according to the configuration of the present embodiment, the projection surface in the extending direction of the connecting hole by the two barrier walls 38 covers the cross section of the connecting hole small-diameter portion, thereby preventing the entry of high-pressure water from the outside. It becomes possible. In this example, since there are two barriers and the overall shape is simple, the cost is extremely low.
[0026]
Next, a third embodiment will be described with reference to FIGS.
4A and 4B are a cross-sectional view of a breather 40 according to a third embodiment of the present invention and a right front view of FIG.
[0027]
The breather 40 is made of an elastic material such as a cylindrical rubber having a connection hole 46 that connects the intake port 42 for the motor internal air and the breathing port 44 to the outside air. The breather 40 extends from the inner peripheral surface 46 a of the connection hole 46 to the connection hole 46. Two rectangular barrier walls 48 having a projecting angle of 120 ° protruding so as to partially block are set apart from each other in the extending direction of the connecting hole 46 and opposed to the circumferential direction of the connecting hole 46 by 180 °. Further, an L-shaped bent portion 47 is set between the barrier wall 48 and the inside air inlet 42.
[0028]
As described above, according to the configuration of the present embodiment, most of the high-pressure water can be prevented from entering by the barrier wall 48 having the projecting angle θ of 120 °, and further, the pressure is reduced by the barrier wall 48, but the breather 40 exceeds the barrier wall 48. Water that enters the water can be prevented from entering by the L-shaped bent portion. In this example, since there are two barriers and the overall shape is simple, the cost is extremely low.
[0029]
【The invention's effect】
As is clear from the above description, according to the present invention, water does not enter from the breather even when the motor receives high-pressure water during high-pressure washing of the vehicle. Moreover, the breather can be manufactured with a single component, and the loss of the barrier can be prevented, so that an inexpensive breather can be obtained. Furthermore, since the protruding angle of the barrier can be about 120 °, the position of attaching the breather to the motor can be freely selected.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where the motor according to the first embodiment of the present invention is mounted.
2 is an enlarged front view of the first embodiment of the present invention as seen from the direction A in FIG. 1;
FIG. 3 is a cross-sectional view and a right front view of the second embodiment of the present invention.
FIG. 4 is a cross-sectional view and a right front view of a third embodiment of the present invention.
FIG. 5 is an explanatory diagram of an increasing tendency of the length in the y direction with respect to the protruding angle θ of the barrier.
[Explanation of symbols]
10 ... motor, 12 ... armature, 14 ... first case,
16 ... second case, 20, 30, 40 ... breather, 22, 32, 42 ... intake,
24, 34, 44 ... breathing port, 26, 36, 46 ... connecting hole, 26a, 36a, 46a ... connecting hole inner peripheral surface 27, 47 ... L-shaped bent part, 28, 38, 48 ... barrier, 29, 39 … Small diameter of connecting hole,
θ… Projection angle of the barrier

Claims (5)

A breather for a motor made of a cylindrical elastic material having a connection hole that connects a motor intake port and a breathing port with outside air, and projects so as to block a part of the connection hole from the inner peripheral surface of the connection hole. Three or more barriers to be provided are separated from each other in the connecting hole extending direction and are arranged at different connecting hole circumferential angular positions at a projecting angle of 120 ° or less, and projection surfaces in the connecting hole extending direction by the plurality of barriers Covers the cross section of the connecting hole. Together with the barrier is three, motors breather according to claim 1, wherein the projecting angle of the inner circumferential surface of the connecting hole is substantially 120 °.   3. The motor according to claim 1, wherein a connecting hole small-diameter portion and an L-shaped bent portion are provided in order toward the intake port between the barrier and the intake port of the inside air. Breather for. A breather for a motor made of a cylindrical elastic material having a connection hole that connects a motor intake port and a breathing port with outside air, and projects so as to block a part of the connection hole from the inner peripheral surface of the connection hole. The barriers to be installed are spaced apart from each other in the connecting hole extending direction and are arranged at different connecting hole inner circumferential direction positions with a projecting angle of 120 ° or less, and the intake port between the barrier and the intake port for the inside air A motor breather, characterized in that a connecting hole small-diameter portion is provided toward the surface, and a projection surface in the extending direction of the connecting hole by the plurality of barriers substantially covers the cross-section of the connecting hole small-diameter portion. The barrier is with a two motor breather according to claim 4, wherein the projecting angle of the inner circumferential surface of the connecting hole, characterized in that it is approximately 120 °.

Images