JP3668788B2 - Breeza - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a breather used to ventilate the inside of a motor.
[0002]
[Prior art]
Conventionally, as a breather for ventilating the inside of a motor, one described in Japanese Utility Model Publication No. 3-45056 is known.
[0003]
In the breather described in the above publication, one side of the cylindrical body is fixed to the air vent of the motor, and the other side facing the lower side of the vehicle is opened.
[0004]
In a motor with a breather equipped with such a breather, when current is supplied from the power supply, the armature rotates and the current flowing through the armature winding heats the winding, warming the air inside the motor. Inflated. The expanded air is exhausted through the breather. On the other hand, when the current supplied to the motor is interrupted, the warmed air inside the motor contracts and the atmosphere is introduced into the motor through the breather. In addition, when electric current is supplied to the motor and water is applied to the motor in a state where the temperature of the motor is high, the motor is cooled by water and the air in the motor contracts. Even in this case, air is introduced into the motor through the breather.
[0005]
[Problems to be solved by the invention]
In a motor with a breather, if there is a large amount of water in the breather, a water film may form at the opening of the breather.If the air inside the motor shrinks with the water film formed at the opening, the water film There is a problem that the water is sucked into the motor and water enters the motor.
[0006]
OBJECT OF THE INVENTION
An object of the breather according to the present invention is to provide a breather in which rainwater does not enter even if there is a large amount of water.
[0007]
[Structure of the invention]
[0008]
[Means for Solving the Problems]
Breather according to claim 1 of the present invention is formed by flexible rubber, a body formed in a tubular shape, is formed annularly on one side of the body, the vent hole provided in the motor of the gear casing a case fixing portion mounted to communicated with the, an open portion formed annularly on the other end of the body, a greater length dimension than the inner diameter of the body in the cylindrical direction of the body on the periphery of the opening A plurality of tongue pieces that are continuously formed in the circumferential direction, and the tongue pieces are provided with tapered end portions that are tapered toward the tip of the open portion. The breather according to claim 2 of the present invention is characterized in that the tongue piece has at least three continuous triangular forming surfaces in the circumferential direction of the open portion. It is said.
[0009]
[Effects of the Invention]
In the breather according to the first aspect of the present invention, since the main body is formed of flexible rubber, the tip end portion easily swings and drops of water easily fall and a water film is formed in the open portion. Not. Since the opening portion has an opening area including the tongue piece portion, the opening area of the opening portion is larger than the cross-sectional area of the main body. Therefore, it becomes difficult to form a water film in the open portion. In addition, since the opening portion has an opening area including the tongue piece portion and the surface area decreases as it goes to the tapered end portion, the opening area of the opening portion becomes larger than the cross-sectional area of the main body and has a small surface area. Rainwater will flow in the open area. Therefore, it becomes more difficult to form a water film in the open portion. In the breather according to claim 2 of the present invention, the open portion has an opening area including a continuous tongue piece portion formed in a triangular shape at least at three triangular positions in the circumferential direction, and has a surface area toward the tip. Therefore, the opening area of the open part becomes larger than the cross-sectional area of the main body, and rainwater concentrates and flows in the open part having a small surface area. Therefore, it becomes difficult to form a rainwater film in the open portion.
[0010]
【Example】
1 to 5 show a breather according to a first embodiment of the present invention.
[0011]
The illustrated breather 9 is attached to a motor 1, and the motor 1 mainly includes a yoke 2, a magnet 3, an armature 4, a speed reduction mechanism 5, an output shaft 6, a gear casing 7, and a gear casing cover 8. A breather 9 is attached to the gear casing 7 of the motor 1.
[0012]
The yoke 2 is formed in a cylindrical shape, and its open end is fixed by screwing a screw 10 into one side of the gear casing 7. Two semi-cylindrical magnets 3 are attached to the inner peripheral surface of the yoke 2, and the armature 4 is disposed on the inner peripheral side of both the magnets 3.
[0013]
In the armature 4, an armature core 4b is fixed to an armature shaft 4a corresponding to the magnet 3, and an armature coil 4c is wound around the armature core 4b. The armature coil 4c is electrically connected to a plurality of commutator pieces 4d1 included in the commutator 4d fixed to the armature shaft 4a in the vicinity of the armature core 4b.
[0014]
Since the armature shaft 4a is rotatably supported by a bearing 11 mounted on the opposite side of the yoke 2 on the one side and a bearing 12 mounted on the gear casing 7, the armature shaft 4a can be slidably contacted with each commutator piece 4d1. When an energization path is formed by connecting a power source to the two brushes 13 arranged, the armature coil 4c is excited by the passing current to generate a magnetic force, and the magnetic force of the armature coil 4c and the magnet 3 are generated. The armature 4 is rotated by the magnetic force.
[0015]
The gear casing 7 is formed with a speed reduction mechanism accommodating portion 7b surrounded by a side wall 7a. The speed reduction mechanism accommodating portion 7b is sealed by screwing the gear casing cover 8 with a screw (not shown). The other side of the armature shaft 4a and the speed reduction mechanism 5 are housed in the speed reduction mechanism accommodating portion 7b.
[0016]
In the armature shaft 4a, a worm 4a1 constituting a part of the speed reduction mechanism 5 is formed at a portion protruding into the speed reduction mechanism accommodating portion 7b, and a worm constituting another part of the speed reduction mechanism 5 is formed on the worm 4a1. Since the wheel 5a is engaged, and the worm wheel 5a is fixed to the output shaft 6 rotatably supported by the gear casing 7, the rotational force of the armature shaft 4a is decelerated by the worm wheel 5a to cause the output shaft 6 to move. Rotate. The output shaft 6 is coupled to a glass lifting and lowering device for moving up and down a window glass (not shown) which is a load outside the gear casing 7.
[0017]
Further, a yoke communication portion 7c that is open to the yoke 2 side and independent from the speed reduction mechanism housing portion 7b is formed at a portion where the gear casing 7 is coupled to the yoke 2. The yoke communication portion 7c is connected to the yoke communication portion 7c. One end of the pore 7d is in communication. Since the other end of the vent hole 7d is opened outside the gear casing 7, the yoke communication portion 7c communicates with the outside via the vent hole 7d.
[0018]
A breather locking portion 7d1 protruding in an annular shape is formed on the side edge of the other end of the vent hole 7d, and a breather 9 is attached to the breather locking portion 7d1.
[0019]
As shown in FIG. 3, the breather 9 includes a main body 9a formed of a flexible rubber in a cylindrical shape, a case fixing portion 9b formed in an annular shape on one end side of the main body 9a, and a main body 9a. It consists of an open part 9c formed in an annular shape on the other end side and a tongue piece part 9d formed continuously in the circumferential direction of the open part 9c.
[0020]
The main body 9a of the breather 9 is formed with a bent portion 9a1 which is bent at approximately 90 degrees at the center portion.
[0021]
As shown in FIG. 4, the case fixing part 9b of the breather 9 is formed to have an outer diameter larger than the outer dimension of the main body 9a, and the outer side of the breather locking part 7d1 of the gear casing 7 is formed inside. Since the concave portion 9b1 formed to be slightly smaller than the diameter dimension is provided, the flow passage 9a2 is communicated with the vent hole 7d by being pushed into the breather locking portion 7d1, and the breather locking portion 7d1 is elastic. It is mated.
[0022]
As shown in FIG. 4, the open portion 9c of the breather 9 is open on the other end side of the main body 9a, so that the flow path 9a2 communicated with the case fixing portion 9b is opened to the atmosphere. When the motor 1 is attached to the vehicle body side, the opening portion 9c is disposed so as to open the flow path 9a2 downward.
[0023]
And since the tongue piece part 9d of the breather 9 is formed in three places which continued in the triangle shape in the circumferential direction of the open part 9c, it consists of the continuous triangle formation surface 9d1. Since the tongue piece 9d has a depth dimension L1 shown in FIG. 4 larger than the inner diameter dimension D1 of the main body 9a shown in FIG. 5, the opening 9c is also divided into three parts, and the surface area of the opening 9c is the tongue piece. Since the surface area of the tapered end portion 9c1 which is formed to include the portion 9d and is tapered toward the tip is reduced, the area where rainwater adheres becomes extremely small at the open portion 9c.
[0024]
Further, since the tongue piece 9d is continuously formed by the triangular forming surface 9d1 in the circumferential direction of the opening 9c, the volume of the tapered end 9c1 is reduced in the opening 9c, thereby opening the opening 9c. Since the tapered end portion 9c1 of the portion 9c is elastically swingable so as to increase or decrease the cross-sectional area of the open portion 9c due to vehicle body vibration or the like, the tapered end portion 9c1 swings. It also has a function of imparting kinetic energy to the rainwater that has flowed along the outside of the main body 9a, causing the rainwater to scatter and spontaneously fall at the opening 9c, thereby making it difficult to form a water film.
[0025]
Further, since the tongue piece 9d is not arranged in the radial direction of the open part 9c in the three-divided open part 9c, the opening part 9c does not form a flow path that faces in the radial direction, and therefore rainwater is released from the open part. 9c is prevented from passing in the radial direction, and the distance between the tapered end portions 9c1 and 9c1 is increased, thereby preventing the generation of a water film. In this embodiment, the tongue piece portion 9d is provided at three locations. However, if the opening portion 9c is arranged so as not to oppose the radial direction, the tongue piece portion 9d is not limited to three locations. It is desirable to arrange in odd places.
[0026]
The motor 1 to which the breather 9 having such a structure is attached is mounted in a vehicle door by coupling the output shaft 6 to a glass lifting device (not shown), and external wirings (not shown) are connected to the brushes 13 respectively. The opening 9c of the breather 9 is disposed with the flow path 9a2 open toward the lower side of the vehicle.
[0027]
Therefore, when a window switch (not shown) is switched on to the down side, the external wiring is connected to the power source, and a current in the positive direction flows through the brushes 13 and 13, so that the armature 4 rotates forward. Since the output shaft 6 is rotated forward by the forward rotation of the armature 4, the window glass is moved downward by the forward rotation of the output shaft 6.
[0028]
On the contrary, when the window switch is turned on to the up side, the external wiring is reversely connected to the power source, and a current in the reverse direction flows through the brushes 13 and 13, so that the armature 4 rotates in the reverse direction. Since the output shaft 6 is reversely rotated by the reverse rotation of the armature 4, the window glass is moved to the ascending side by the reverse rotation of the output shaft 6.
[0029]
When the armature 4 is rotated forward or backward by each turn-on of the window switch, the armature coil 4c is sequentially excited by the current supply from the brushes 13 to each commutator piece 4d1, and the armature 4 is caused by resistance loss. Fever.
[0030]
When the air inside the motor 1 is heated by the heat generated by the armature 4 and the air inside the yoke 2 expands, the yoke 9 passes through the flow passage 9a2 of the breather 9, the vent hole 7d of the gear casing 7, and the yoke communication portion 7c. Since the inside of 2 communicates with the atmosphere, the air expanded in the yoke 2 is led out to perform a breathing action, and the inside of the yoke 2 is adjusted to atmospheric pressure.
[0031]
When rain is applied to the motor 1 due to rain or being washed, rain water is also applied to the gear casing 7 and the yoke 2, and the rain water flows through the outside of the main body 9 a of the breather 9 to the open portion 9 c.
[0032]
The rainwater flowing into the opening 9c of the breather 9 has the tongue piece 9d continuous in the circumferential direction of the opening 9c by the triangular forming surface 9d1, and the depth dimension L1 of the triangular tongue piece 9d is the depth of the main body 9a. Furthermore, since the tapered end 9c1 is formed at the tip, it is concentrated at the tapered end 9c1, falls easily, does not adhere to the inside of the opening 9c, The position of the tapered end portion 9c1 is displaced by elastically swinging the tapered end portion 9c1 of the opening portion 9c so as to increase or decrease the cross-sectional area of the opening portion 9c due to vehicle body vibration or the like. In order to impart kinetic energy to rainwater, a water film is not easily formed on the open portion 9c, and rainwater is scattered without adhering to the open portion 9c and is naturally dropped.
[0033]
【The invention's effect】
As described above, according to the breather according to the first aspect of the present invention, since the main body is formed of flexible rubber, the tip end portion easily swings and water droplets easily fall. In addition, a water film is not formed in the open portion. Since the opening area of the opening includes the tongue piece and is larger than the cross-sectional area of the main body, it is difficult for the water film to occur in the opening. In addition, since the opening area of the opening includes the tongue piece and the surface area is reduced as it goes to the tapered end, the opening area of the opening is larger than the cross-sectional area of the main body and the surface area is small. Since rainwater concentrates and flows in the open portion, rainwater stagnation hardly occurs in the open portion, and a water film is not easily formed. According to the breather according to claim 2 of the present invention, the open portion has an opening area including the tongue piece portion continuous in the circumferential direction by the triangular forming surface, and the surface area is reduced toward the tapered end portion. Therefore, since the opening area of the opening part is made larger than the cross-sectional area of the main body and rainwater concentrates and flows in the opening part having a small surface area, the stagnation of rainwater can be remarkably reduced in the opening part, and a water film is not easily generated Excellent effect.
[0034]
In the first and second aspects of the present invention, since the tongue piece portion vibrates easily, a uniform water film is not easily formed on the open portion. Therefore, even if the temperature of the motor decreases and the air inside the motor contracts, rainwater does not become a water film and is not sucked into the motor.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a breather according to the present invention in a motor mounting state in a first embodiment.
FIG. 2 is a partially longitudinal side view of the breather in a motor-mounted state shown in FIG.
3 is an external perspective view of the breather shown in FIG. 1. FIG.
4 is a partially longitudinal front view of the breather shown in FIG. 3;
FIG. 5 is a side view of the breather shown in FIG. 3;
DESCRIPTION OF SYMBOLS 1 Motor 7 Gear casing 7d Air hole 9 Breather 9a Main body 9b Case fixing | fixed part 9c Opening part 9c1 Tapered end part 9d Tongue piece part 9d1 Triangle formation surface 9d2 Rectangle formation surface

Claims (2)

A main body formed of a flexible rubber and formed in a cylindrical shape; a case fixing portion which is formed in an annular shape on one end side of the main body and attached in communication with a vent hole provided in a gear casing of the motor; An opening portion formed in an annular shape on the other end side of the main body, and a length dimension larger than the inner diameter of the main body in the cylindrical direction of the main body on the periphery of the opening portion, and continuously formed in the circumferential direction And a plurality of tongue pieces, wherein the tongue pieces are provided with tapered end portions that are tapered toward the tip of the open portion . 2. The breather according to claim 1, wherein the tongue piece is provided with a continuous triangular forming surface in at least three triangular shapes in the circumferential direction of the opening.

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