JP5689019B2 - Washer pump and washer device - Google Patents

Description

  The present invention relates to a washer pump and a washer device including a motor body that drives a pump unit.

  A vehicle such as an automobile is equipped with a washer device for cleaning the windshield. The washer device has a washer tank for storing the cleaning liquid and a washer pump attached to the washer tank. For example, as described in Patent Document 1, the washer pump is arranged in a state where a part of the washer pump is inserted into the washer tank, and the cleaning liquid leaks between the washer pump and the washer tank to the outside of the washer tank by the grommet. Is prevented.

  The washer pump includes a pump unit that sucks the cleaning liquid in the washer tank and discharges the cleaning liquid to the outside of the washer tank, and a motor body as a drive source that drives the pump unit. A motor housing chamber for housing the motor body is formed in the washer pump housing, and the tip of the rotating shaft of the motor body passes through the housing and protrudes into the pump section. By rotating the impeller attached to the tip of the rotating shaft, the cleaning liquid in the washer tank is sucked into the washer pump, and the cleaning liquid is jetted from the washer nozzle to the windshield. Further, a sealing material is provided between the motor housing chamber and the pump unit so that the cleaning liquid does not leak into the motor housing chamber.

  By the way, the air in the motor housing chamber expands or contracts due to temperature changes when the motor main body is driven and stopped. For this reason, when the motor housing chamber is sealed with respect to the outside of the housing, a pressure difference is generated between the motor housing chamber and the outside of the housing due to the expansion or contraction of air in the motor housing chamber. When the air contracts, the cleaning liquid may leak into the motor housing chamber through the gap of the sealing material due to the negative pressure. If the cleaning liquid leaks into the motor housing chamber in this way, it becomes a factor that causes an abnormality in the operation of the washer pump due to the water in the motor body.

  Therefore, for example, in the washer pumps described in Patent Documents 1 and 2, in order to prevent the cleaning liquid from leaking into the motor housing chamber, an air passage that communicates between the motor housing chamber and the outside of the housing is provided, and the motor housing chamber is provided. And a pressure difference between the outside of the housing and the outside of the housing.

JP 2000-177542 A JP 2010-120507 A

  Such an air passage is provided on the lower side of the washer pump, and water enters the motor housing chamber through the air passage by bending and communicating between the motor housing chamber and the outside of the housing in a plurality of directions. To prevent that.

  For example, in the washer pump shown in FIG. 1 of Patent Document 1, a communication chamber and an external communication portion formed in the housing, and an air passage that bends in three directions by an internal communication portion formed between the housing and the lid. Is formed. However, in this case, since it is necessary to form the communication chamber and the external communication portion that are bent with respect to each other in the housing, the molding operation of the housing becomes complicated. In other words, it is necessary to separately form an external communication portion that opens to the side orthogonal to the mold drawing direction when the housing is injection-molded, which increases the housing molding operation process.

  Similarly, in the washer pump shown in FIG. 5 of Patent Document 1, an external communication portion that is bent at a right angle is formed on the lid, which complicates the molding operation of the lid. Further, in this case, since a ventilation path is formed between the opening end of the housing and the lid, the path of the ventilation path that communicates between the motor chamber and the outside of the housing is shortened. For this reason, when strong water is received from below the washer pump, water may enter the motor chamber through the air passage.

  Moreover, in the pump apparatus described in Patent Document 2, the motor chamber and the outside of the housing are communicated with each other by attaching a separate waterproof cap having an L-shaped communication path to the housing. In this case, the molding work of the waterproof cap having the air passages whose opening directions are orthogonal to each other is complicated, and the work process for mounting the waterproof cap of another member to the housing increases, so that the assembling workability of the washer device is improved. It will get worse.

  An object of the present invention is to form a complicated air passage with a simple structure.

  Another object of the present invention is to reliably prevent water from entering the motor housing chamber.

The washer pump of the present invention includes a pump unit that is attached to a tank that stores liquid, sucks the liquid in the tank, and discharges the liquid to the outside of the tank, and a motor body that drives the pump unit. A washer pump, wherein a motor housing chamber for housing the motor main body is formed to open on the axial base end side, and an opening portion on the axial base end side of the motor housing chamber assembled to the housing. A lid that closes the housing, an elastic body that is attached to the housing and seals between the housing and the tank in a state of being attached to the tank, and is provided integrally with the housing, and its axially proximal end side And the outer surface of the housing between the motor housing chamber and the outer end of the housing. And a vent path formation section for forming an air passage that is bent in at least three directions passing, the air passage is formed inside of the air passage forming portion, the opening portion of the axial tip side by the elastic member An axial passage that is closed, and an opening formed on the side that bends with respect to the axial passage between the end portion on the axial base end side of the air passage forming portion and the lid, and is formed in the axial direction. An internal communication opening that communicates the passage and the motor housing chamber, and an axially distal end of the air passage forming portion between the axially distal end of the air passage forming portion and the elastic body And having an external communication opening formed to open to the side bent with respect to the axial passage and communicating the axial passage with the outside of the housing .

Washer pump of the present invention, the axial passage, the opening of the axial base end side, characterized that you have been closed by the lid.

  In the washer pump of the present invention, the axially proximal end face of the partition partitioning the motor housing chamber and the axial passage is disposed opposite to the inner surface of the lid body through the gap, The internal communication opening is formed between the partition wall and the lid.

  The washer pump of the present invention forms an external extension passage that is bent with respect to the external communication opening by an external passage extension wall provided in the air passage forming portion so as to face the external communication opening, and the external extension The external communication passage communicates with the outside of the housing through a passage.

  The washer pump according to the present invention is characterized in that the axial passage is formed so as to be inclined downward toward the tip end side in the axial direction.

  The washer pump according to the present invention is characterized in that the motor body is a brush motor having a power feeding brush, and the brush is held by the lid.

  The washer pump according to the present invention is characterized in that the motor body has a cylindrical yoke that opens to both ends in the axial direction.

  A washer device according to the present invention includes any one of the above-described washer pumps and the tank to which the washer pump is attached, and the washer pump is disposed in a state where an axial front end side of the washer pump is inserted into the tank. It is characterized by doing.

  According to the present invention, since the air passage is formed by the air passage forming portion, the lid body, and the elastic body integrally provided in the housing, a complicated air passage bent at least in three directions can be formed with a simple structure. Can be formed. Accordingly, it is not necessary to form a passage that bends in the housing or the lid body, so that the housing and the lid body can be easily molded. Further, since the passage of the air passage can be made long, it is possible to reliably prevent water from entering the motor housing chamber through the air passage. Further, since the lid and elastic body conventionally used in the washer pump are used, there is no increase in cost due to an increase in the number of parts, and deterioration in workability due to an increase in the mounting process of separate members. .

  According to the present invention, since the end surface on the axial base end side of the partition wall is arranged to face the inner surface of the lid through a gap, the axial passage is formed in the motor housing chamber via the internal communication opening. Direct communication over a wide range can more effectively suppress the occurrence of a temperature difference or a pressure difference between the motor housing chamber and the outside of the housing.

  According to the present invention, the external communication opening and the outside of the housing are communicated with each other via the external extension passage, so that the number of times the air passage is bent is increased as compared with the case where the external extension passage is not provided. The path can be formed in a more complicated manner, and the path of the ventilation path can be further extended. Therefore, it is possible to more reliably prevent water from entering the motor housing chamber through the air passage.

  According to the present invention, the axial passage is formed so as to be inclined downward toward the tip end side in the axial direction, so that even if water enters the ventilation path, the axial passage is inclined. Since water flows along the axial front end side and is discharged to the outside of the housing from the external communication opening, it is possible to more reliably prevent water from entering the motor housing chamber through the air passage.

  According to the present invention, since the power supply brush is held by the lid, there is no need to provide a brush holder for holding the brush in the opening on the axially proximal end side of the motor housing chamber. It can be set as the structure which opened the peripheral part to the axial direction base end side. Thereby, since the motor housing chamber and the air passage are communicated in a wide range, it is possible to more effectively suppress a temperature difference and a pressure difference between the motor housing chamber and the outside of the housing.

  According to the present invention, since the water entering the motor housing chamber is reliably prevented, the yokes can be shaped to be opened at both axial ends. Thereby, the axial direction dimension of a motor main body becomes small, and a washer pump can be reduced in size and weight by extension. In addition, by forming the yokes so as to open to both ends in the axial direction, the air passage can be communicated over a wide range up to the end on the front end side in the axial direction of the motor accommodating chamber. It can suppress more effectively that a temperature difference and a pressure difference arise between the exterior of this.

It is the schematic which shows the washer apparatus provided with the washer pump which is one embodiment of this invention. It is sectional drawing of the washer pump shown in FIG. It is a perspective view of the washer pump shown in FIG. It is a disassembled perspective view of the washer pump shown in FIG. It is sectional drawing of the washer pump which follows the AA line in FIG. It is sectional drawing of the washer pump which follows the BB line in FIG. It is sectional drawing of the washer pump which follows the CC line in FIG. It is sectional drawing of the washer pump which follows the DD line | wire in FIG. It is sectional drawing which shows the modification of a washer pump. It is sectional drawing of the washer pump which follows the EE line in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The washer device 10 is mounted on a vehicle such as an automobile and is used for cleaning windshields (not shown) on the front side and rear side of the vehicle. As shown in FIG. 1, the washer device 10 includes a washer tank 11 that stores a cleaning liquid L for cleaning the windshield, and a washer pump 12 that is attached to the washer tank 11.

  The washer tank 11 is formed in a container shape from a resin material such as plastic, and a cleaning liquid L is stored therein. The tank wall 13 forming the outline of the washer tank 11 is provided so that the vicinity of the bottom of the tank wall 13 is recessed toward the inside of the washer tank 11, thereby forming the pump housing space S outside the tank wall 13 a near the bottom. ing. Moreover, the circular insertion hole 14 which penetrates the tank wall 13a is formed in the tank wall 13a near the bottom. The washer pump 12 is arranged in the pump housing space S with the axially distal end side (left side in FIG. 1) of the washer pump 12 inserted into the washer tank 11 through the insertion hole 14.

  An annular grommet (elastic body) 15 made of an elastic material such as rubber is attached to a housing 22 (described later) of the washer pump 12 so as to surround the outer periphery of the substantially central portion in the axial direction. In a state where the washer pump 12 is attached to the washer tank 11, the grommet 15 is assembled in the insertion hole 14 of the washer tank 11 in a compressed state, and the gap between the tank wall 13 a and the housing 22 is sealed by the grommet 15. In other words, the washer pump 12 is liquid-tightly attached to the insertion hole 14 of the washer tank 11 by the grommet 15, and the cleaning liquid L is prevented from leaking between the washer tank 11 and the washer pump 12 to the outside of the washer tank 11. ing.

  FIG. 2 is a cross-sectional view of the washer pump shown in FIG. 3 is a perspective view of the washer pump shown in FIG. 1, and FIG. 4 is an exploded perspective view of the washer pump shown in FIG. 5 is a cross-sectional view of the washer pump along the line AA in FIG. 2, and FIG. 6 is a cross-sectional view of the washer pump along the line BB in FIG. 7 is a cross-sectional view of the washer pump along the line CC in FIG. 2, and FIG. 8 is a cross-sectional view of the washer pump along the line DD in FIG. In addition, illustration of the grommet 15 mentioned above is abbreviate | omitted in FIGS.

  As shown in FIG. 2, the washer pump 12 includes a pump unit 20 that sucks the cleaning liquid L in the washer tank 11 and discharges the cleaning liquid L to the outside of the washer tank 11, and a motor as a drive source that drives the pump unit 20. It has a main body 21 and a housing 22 in which the motor main body 21 is assembled.

  The housing 22 is formed in a substantially cylindrical shape by a resin material, and the housing 22 is provided with a motor accommodating portion 23 for accommodating the motor main body 21. The motor housing portion 23 includes a cylindrical wall 24 extending in the axial direction, and a bottom wall 25 that closes an opening on the axial front end side (left side in FIG. 2) of the cylindrical wall 24. The storage chamber 26 is formed to open to the axial base end side (right side in FIG. 2). A resin lid 27 is assembled to the end of the housing 22 on the proximal side in the axial direction. The lid 27 closes the opening of the motor housing chamber 26 on the proximal side in the axial direction.

  A DC motor with a brush is used for the motor main body 21 accommodated in the motor accommodating chamber 26. The motor main body 21 has yokes 29 formed in a cylindrical shape that are opened to both ends in the axial direction by thin steel plates. doing. As shown in FIG. 6, the yoke 29 has a flat cross-sectional shape including a pair of flat portions 29 a extending in parallel with each other and a pair of arc portions 29 b respectively connecting the ends of the pair of flat portions 29 a. ing.

  The motor housing chamber 26 has a substantially flat cross section corresponding to the cross sectional shape of the yoke 29, and the cylindrical wall 24 of the motor housing portion 23 faces the arc portion 29 b of the yoke 29 from its inner surface. A plurality of protrusions 30 projecting radially inward are provided. Each projection 30 has a different radial dimension, and by providing a plurality of projections 30 having different shapes, it is possible to suppress the occurrence of sink marks during the injection molding of the housing 22. Further, the radially inner end of each protrusion 30 is in contact with the outer surface of the arc portion 29 b of the yoke 29, and the yoke 29 is held in the motor housing chamber 26 by the plurality of protrusions 30. As a result, the heat dissipation of the motor main body 21 is improved, and the cylindrical wall 24 of the motor housing portion 23 can be formed thin, so that the housing 22 is reduced in size and weight.

  On the inner surface of the arc portion 29b of the yoke 29, a pair of arc-shaped permanent magnets 31 magnetized in the N-pole and S-pole respectively inward in the radial direction are fixed opposite to each other. An armature 32 that faces each permanent magnet 31 via a minute gap is rotatably provided inside the yoke 29, and a coil 33 is wound around the armature 32.

  A rotation shaft 34 of the motor body 21 is fixed to the rotation center of the armature 32 so as to penetrate in the axial direction. The front end side in the axial direction of the rotating shaft 34 is rotatably supported by an annular radial bearing 35 fixed to the bottom wall 25 of the motor housing portion 23. Further, the end of the rotating shaft 34 on the front end side in the axial direction protrudes outside the motor housing portion 23 through a through hole 36 formed in the bottom wall 25. An annular sealing material 37 made of an elastic material such as rubber is attached to the through hole 36, and the sealing material 37 is in sliding contact with the outer peripheral surface of the rotating shaft 34. The sealing material 37 prevents the cleaning liquid L from leaking into the motor housing chamber 26 from between the bottom wall 25 of the motor housing portion 23 and the rotating shaft 34. On the other hand, the axially proximal end of the rotating shaft 34 is rotatably supported by an annular radial bearing 38 fixed to the lid 27.

  A cylindrical commutator 39 is fixed between the armature 32 and the radial bearing 38 on the proximal end side in the axial direction of the rotary shaft 34, and the end of the coil 33 is electrically connected to the commutator 39. It is connected to the. A pair of power supply brushes 40 held by the lid body 27 is in sliding contact with the outer peripheral surface of the commutator 39. Further, the lid 27 is integrally provided with a connector connecting portion 41, and the connector connecting portion 41 is electrically connected to a vehicle control device (not shown).

  In the motor main body 21, when a driving switch provided in the vehicle interior is turned on by the driver, a driving current is supplied to the coil 33 via the connector connecting portion 41, the brush 40, and the commutator 39. As a result, electromagnetic force torque in the rotational direction is generated in the armature 32, and the rotary shaft 34 is driven to rotate in the forward direction or the reverse direction at a predetermined rotational speed in accordance with the magnitude or direction of the drive current supplied to the motor body 21. It has come to be.

  As shown in FIG. 2, a resin-made pump casing 44 is assembled to the end of the housing 22 in the axial front end side, and a pump chamber 45 is formed between the housing 22 and the pump casing 44. An end portion of the rotating shaft 34 on the tip end side in the axial direction protrudes into the pump chamber 45, and an impeller 46 is fixed to an end portion of the tip end side of the rotating shaft 34 in the axial direction. The impeller 46 includes a plurality of blades extending radially, and is rotated integrally with the rotary shaft 34 in the pump chamber 45.

  In the pump casing 44, a suction port 47 for sucking the cleaning liquid L in the washer tank 11 into the pump chamber 45 is formed so as to penetrate in the axial direction so as to face the impeller 46 in the axial direction. . In the state where the washer pump 12 is attached to the washer tank 11, the tip end side in the axial direction of the washer pump 12 is inserted into the washer tank 11, and the pump chamber 45 is communicated into the washer tank 11 via the suction port 47. Yes. Further, the housing 22 is positioned on the outside of one flat portion 29a of the yoke 29, that is, on the upper side of the motor accommodating portion 23 in FIG. A communication channel 48b is formed along the axial direction.

  The housing 22 is provided with a valve unit 50 for switching the injection of the cleaning liquid L between the front side and the rear side on the axial base end side, that is, the side disposed outside the washer tank 11. Yes. The valve unit portion 50 is disposed above the motor housing portion 23 in FIG. In the valve unit 50, a first valve chamber 51a communicating with the first communication channel 48a and a second valve chamber 51b communicating with the second communication channel 48b are formed, and the first valve chamber 51a The second valve chamber 51b is partitioned by a diaphragm-type switching valve 52 made of an elastic material such as rubber. The valve chambers 51a and 51b are respectively provided with a first valve seat portion 53a and a second valve seat portion 53b that face the switching valve 52 with a predetermined gap therebetween. The switching valve 52 is provided with the first valve chamber 51a. Due to the pressure difference between the inside and the second valve chamber 51b, it is elastically deformable in the left-right direction in FIG.

  In the washer pump 12, when the rotation shaft 34 of the motor body 21 is driven to rotate in the forward direction and the impeller 46 is rotated in the clockwise direction in FIG. 5 in the pump chamber 45, the cleaning liquid L is supplied from the suction port 47 to the pump chamber. It is sucked into 45 and sent out to the first communication channel 48a in a pressurized state. When the pressure in the first valve chamber 51a is increased by the cleaning liquid L supplied into the first valve chamber 51a, the switching valve 52 is elastically deformed toward the second valve chamber 51b, and the switching valve 52 is It abuts on the valve seat 53b. As a result, the first discharge passage 55a formed in the first discharge pipe 54a and the first valve chamber 51a are in communication with each other, and the second discharge passage 55b formed in the second discharge pipe 54b and the second discharge passage 54b are in communication with each other. The valve chamber 51b is not in communication. Under this state, the cleaning liquid L is jetted from the front washer nozzle to the windshield on the front side through a tube (not shown) attached to the first discharge pipe 54a.

  On the other hand, when the rotating shaft 34 of the motor main body 21 is rotationally driven in the reverse direction and the impeller 46 is rotated in the counterclockwise direction in FIG. 5 in the pump chamber 45, the cleaning liquid L enters the pump chamber 45 from the suction port 47. Inhaled and sent out to the second communication channel 48b in a pressurized state. When the pressure in the second valve chamber 51b is increased by the cleaning liquid L supplied into the second valve chamber 51b, the switching valve 52 is elastically deformed toward the first valve chamber 51a, and the switching valve 52 is It abuts on the valve seat 53a. As a result, the first discharge passage 55a formed in the first discharge pipe 54a and the first valve chamber 51a are not in communication with each other, and the second discharge passage 55b formed in the second discharge pipe 54b and the first The two-valve chamber 51b is in communication. Under this state, the cleaning liquid L is jetted from the rear washer nozzle to the rear windshield through a tube (not shown) attached to the second discharge pipe 54b.

  The pump unit 20 includes the pump chamber 45, the impeller 46, the communication channels 48a and 48b, and the valve unit 50 described above.

  As shown in FIG. 2, the housing 22 has a ventilation path for communicating the inside of the motor housing chamber 26 and the outside of the housing 22 on the axially proximal end side, that is, the side disposed outside the washer tank 11. The air passage forming portion 60 to be formed is integrally provided. The air passage forming part 60 is located outside the other flat part 29a of the yoke 29 and is disposed below the motor accommodating part 23 in FIG. The ventilation path forming portion 60 is a connection that connects a pair of side walls 61 that extend parallel to each other from the outer surface of the cylindrical wall 24 of the motor housing portion 23 to the lower side in FIG. It has a tube shape with a rectangular cross section provided with a wall (lower wall) 62, and axial passages 63 that open to both ends in the axial direction are formed therein. The connecting wall 62 is formed so as to incline downward in FIG. 2 as it goes to the axial front end side, whereby the axial passage 63 is formed to incline downward in FIG. 2 as it goes to the axial front end side. Has been. Normally, as shown in FIG. 1, the washer pump 12 is attached to the washer tank 11 with the air passage forming portion 60 disposed on the lower side.

  A lid body 27 is abutted against the end portion on the axial base end side of the air passage forming portion 60, and the opening portion on the axial base end side of the axial passage 63 is closed by the lid body 27. A partition wall 64 that partitions the axial passage 63 and the motor storage chamber 26 is formed by the cylindrical wall 24 of the motor storage portion 23, and the end surface on the axial base end side of the partition wall 64 is formed on the inner surface of the lid 27. On the other hand, they are arranged opposite to each other through a predetermined gap. A side bent with respect to the axial passage 63 between the end surface on the axial base end side of the partition wall 64, that is, the end portion on the axial base end side of the air flow path forming portion 60 and the inner surface of the lid body 27 by this gap ( An internal communication opening 65 that opens to the upper side in FIG. 2 is formed, and the axial passage 63 and the motor housing chamber 26 are communicated with each other by the internal communication opening 65.

  On the other hand, the grommet 15 is abutted against the end portion on the axial front end side of the air passage forming portion 60, and the opening portion on the axial front end side of the axial passage 63 is closed by the grommet 15. In addition, the pair of side walls 61 at the end on the axially distal end side of the air passage forming portion 60 has a notch that opens to the side that is bent with respect to the axial passage 63 (the left-right direction in FIG. 6) and the axially distal end side. Are formed respectively. The opening on the axial front end side of the notch is closed by the grommet 15, so that the external communication opening 66 that opens to the side bent with respect to the axial passage 63 becomes the notch of the ventilation path forming portion 60 by the notch. It is formed between the end on the axial front end side and the grommet 15.

  As shown in FIG. 8, the air passage forming portion 60 is provided with external passage extension walls 67 at predetermined intervals on the outside of the pair of side walls 61 so as to face the external communication opening 66. The external passage extension wall 67 extends in the axial direction along the side wall 61, and the end portion on the front end side in the axial direction is abutted against the grommet 15. Between the external passage extension wall 67 and the side wall 61, an external extension passage 68 that is bent and communicated with the external communication opening 66 and opens to the axial base end side is formed. The external communication opening 66 communicates with the axial passage 63 and the outside of the housing 22 through the external extension passage 68.

  The ventilation path is bent in four directions by the axial passage 63, the internal communication opening 65, the external communication opening 66, and the external extension passage 68 that are bent and communicated with each other. As shown by arrows in FIGS. 2 and 8, the temperature difference between the inside of the motor housing chamber 26 and the outside of the housing 22 is established by connecting the inside of the motor housing chamber 26 and the outside of the housing 22 through this air passage. And pressure differences are suppressed. As a result, the cleaning liquid L leaks from the pump chamber 45 into the motor housing chamber 26 through the gap of the sealing material 37 due to a pressure difference between the inside of the motor housing chamber 26 and the outside of the housing 22, or the motor housing chamber. Condensation is prevented from occurring in the motor housing chamber 26 due to a temperature difference between the inside of the housing 26 and the outside of the housing 22. Further, since the air passage is formed by bending in four directions, even if the washer pump 12 receives strong water, it is prevented that water enters the motor housing chamber 26 through the air passage. Has been.

  As described above, in the washer pump 12 according to the present embodiment, the air passage is formed by the air passage forming portion 60, the lid 27, and the grommet 15 that are integrally provided in the housing 22, and therefore, at least in three directions. A bent and complicated air passage can be formed with a simple structure. That is, the internal communication opening 65 and the external communication opening 66 that open to the side bent with respect to the axial passage 63 formed in the air passage forming portion 60 are connected to the air passage forming portion 60 and the lid body 27. And between the air passage forming portion 60 and the grommet 15. This eliminates the need to form a passage that bends in the housing 22 or the lid 27 alone, that is, a passage that opens to the side perpendicular to the mold drawing direction when the housing 22 or the lid 27 is injection-molded. Since it becomes unnecessary to separately form the housing 22, the housing 22 and the lid 27 can be easily formed.

  Furthermore, a lid 27 attached to the end of the housing 22 on the proximal side in the axial direction, a grommet 15 attached to a substantially central portion in the axial direction of the housing 22, and a shaft between the lid 27 and the grommet 15. Since the air passage is formed by the air passage forming portion 60 extending in the direction, the passage of the air passage can be made long. Thereby, it can prevent reliably that water permeates into the motor storage chamber 26 through the ventilation path. In addition, since the lid 27 and the grommet 15 conventionally used in the washer pump 12 are used, the cost increases due to the increase in the number of parts, and the workability deteriorates due to the increase in the mounting work process of another member. There is no invitation.

  Furthermore, since the end on the axial direction front end side of the air passage forming portion 60 is abutted against the grommet 15, the air passage forming portion 60 can be disposed within the diameter of the grommet 15, for example, the air passage forming portion. The washer pump 12 can be reduced in size and weight as compared with the case where the end on the axial front end side is abutted against the tank wall of the washer tank. As a result, the washer pump 12 can be disposed on the lower side with respect to the washer tank 11, which is advantageous for the capacity of the washer tank 11 and the remaining amount of the cleaning liquid L. Further, for example, when the end on the axial front end side of the air passage forming portion is abutted against the tank wall of the washer tank, the tank wall of the washer tank needs to be formed in a specific shape. Since the end of the path forming portion 60 on the front end side in the axial direction is abutted against the grommet 15, it can be applied to various washer devices 10 in which the shape of the tank wall 13 a of the washer tank 11 is different.

  In the present embodiment, a notch is formed at the end of the pair of side walls 61 on the tip end side in the axial direction, and the external communication opening 66 that opens in the left-right direction in FIG. 6 is formed by this notch. However, it is not limited to this. For example, a notch may be formed at the end of the connecting wall 62 on the front end side in the axial direction, and the external communication opening 66 opening downward in FIG. 6 may be formed by this notch.

  In the washer pump 12 of the present embodiment, the end face on the axially proximal end side of the partition wall 64 is disposed to face the inner surface of the lid body 27 via a gap so that the partition wall 64 does not contact the lid body 27. Therefore, the internal communication opening 65 that allows the axial passage 63 and the motor housing chamber 26 to communicate with each other can be widely formed. As a result, the axial passage 63 communicates directly with the motor housing chamber 26 over a wide range via the internal communication opening 65, so that a temperature difference or pressure between the motor housing chamber 26 and the outside of the housing 22 can be obtained. It can suppress more effectively that a difference arises.

  In the washer pump 12 of the present embodiment, the axially proximal end face of the partition wall 64 is disposed to face the inner surface of the lid body 27 via a gap so that the partition wall 64 does not contact the lid body 27. However, it is not limited to this. For example, at the end of the partition wall 64 abutted against the inner surface of the lid 27 on the axial base end side, a notch that is bent with respect to the axial passage 63 and opened to the axial base end side is formed. By closing the opening on the axial base end side of the notch with the lid 27, the internal communication opening between the end on the axial base end side of the air flow path forming portion 60 and the lid 27 is made by the notch. The portion 65 may be formed.

  In the washer pump 12 of the present embodiment, the external communication opening 66 communicates with the outside of the housing 22 through an external extension passage 68 that is bent and communicates with the external communication opening 66. Thereby, compared with the case where the external extension passage 68 is not provided, the number of times the air passage is bent is increased, the air passage can be formed more complicatedly, and the passage of the air passage can be further extended. In addition, since the external passage extension wall 67 is provided outside the external communication opening 66 so as to face the external communication opening 66, water droplets flowing downward along the outer surface of the housing 22 are contained in the external communication opening 66. It is possible to prevent the external passage extension wall 67 from entering. Therefore, it is possible to more reliably prevent water from entering the motor accommodating chamber 26 through the air passage.

  In the washer pump 12 of the present embodiment, the axial passage 63 is formed so as to be inclined downward as it goes toward the distal end side in the axial direction. As a result, even if water enters the ventilation path, the water flows along the inclined surface of the connecting wall 62 toward the front end in the axial direction and is discharged from the external communication opening 66 to the outside of the housing 22. In addition, it is possible to more reliably prevent water from entering the motor accommodating chamber 26 through the air passage.

  In the washer pump 12 of the present embodiment, since the power supply brush 40 is held by the lid 27, a brush holder for holding the brush 40 in the opening on the axially proximal end side of the motor housing chamber 26. There is no need to provide a structure, and the peripheral portion of the brush 40 can be opened to the proximal side in the axial direction. Thereby, since the inside of the motor housing chamber 26 and the air passage are communicated over a wide range, it is possible to more effectively suppress the occurrence of a temperature difference or a pressure difference between the inside of the motor housing chamber 26 and the outside of the housing 22. Can do.

  In the washer pump 12 of the present embodiment, the structure described above prevents water from entering the motor housing chamber 26 with certainty, and therefore the yoke 29 has a shape that opens to both axial ends. it can. In other words, when there is a risk of water in the motor housing chamber, it is necessary to suppress the water in the yoke by making the yoke into a bottomed cylindrical shape. In the washer pump 12 of the present embodiment, which has no fear, the yoke 29 can be shaped without a bottom wall. As a result, the axial dimension of the motor main body 21 is reduced, and as a result, the washer pump 12 can be reduced in size and weight. Further, by forming the yokes 29 so as to open to both ends in the axial direction, the air passage can be communicated over a wide range up to the end on the front end side in the axial direction of the motor storage chamber 26. It is possible to more effectively suppress a temperature difference or a pressure difference between the inside of the housing 26 and the outside of the housing 22.

  FIG. 9 is a cross-sectional view showing a modified example of the washer pump, and FIG. 10 is a cross-sectional view of the washer pump along the line EE in FIG. 9 and 10, the same reference numerals are given to the members in the same manner as the above-described members, and the description thereof is omitted.

  As shown in FIG. 9, the washer pump 70 is different from the washer pump 12 described above in that the yoke 71 is formed in a bottomed shape having a bottom wall 71 a that closes the opening on the axial front end side. Yes. The axially distal end side of the rotating shaft 34 extends through the bottom wall 71a of the yoke 71 and is rotatably supported by a radial bearing 35 fixed to the bottom wall 71a of the yoke 71. Further, a brush holder 72 for holding the power supply brush 40 is provided in the opening on the axially proximal end side of the yoke 71. The brush holder 72 is formed with a communication hole (not shown) that communicates the air passage with the inside of the motor housing chamber 26.

  Thus, the yoke 71 is not limited to a cylindrical shape that opens to both ends in the axial direction, but may have a bottomed shape including a bottom wall 71a that closes the opening at the tip end in the axial direction. Further, the structure is not limited to the structure in which the brush 40 is held by the lid body 27, and the brush holder 72 may be provided in the opening portion on the proximal end side in the axial direction of the yoke 71.

  As shown in FIG. 10, in this washer pump 70, unlike the washer pump 12 described above, the external passage extension wall 67 is not provided in the vent passage forming portion 60. As described above, in the washer pump 12 described above, the external passage extension wall 67 is provided and the ventilation passage is bent in four directions, but the external passage extension wall 67 is not necessarily provided. That is, if the air passage is formed to be bent in at least three directions, it is possible to sufficiently prevent water from entering the motor housing chamber 26 through the air passage.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the washer device 10 is described as being mounted on a vehicle such as an automobile, but the present invention is not limited to this. For example, the washer device 10 of the present invention may be used as a washer device mounted on an aircraft, a railway vehicle, a construction machine, or the like.

DESCRIPTION OF SYMBOLS 10 Washer apparatus 11 Washer tank 12 Washer pump 13, 13a Tank wall 14 Insertion hole 15 Grommet (elastic body)
DESCRIPTION OF SYMBOLS 20 Pump part 21 Motor main body 22 Housing 23 Motor accommodating part 24 Cylindrical wall 25 Bottom wall 26 Motor accommodating chamber 27 Cover 29 Yoke 29a Flat part 29b Arc part 30 Protrusion 31 Permanent magnet 32 Armature 33 Coil 34 Rotating shaft 35 Radial bearing 36 Through hole 37 Sealing material 38 Radial bearing 39 Commutator 40 Brush 41 Connector connection 44 Pump casing 45 Pump chamber 46 Impeller 47 Suction port 48a First communication channel 48b Second communication channel 50 Valve unit 51a First valve chamber 51b 2nd valve chamber 52 Switching valve 53a 1st valve seat part 53b 2nd valve seat part 54a 1st discharge pipe 54b 2nd discharge pipe 55a 1st discharge flow path 55b 2nd discharge flow path 60 Ventilation passage formation part 61 Side wall 62 Connection Wall 63 Axial passage 64 Bulkhead 65 Internal communication opening 66 External Communication opening 67 External passage extension wall 68 External extension passage 70 Washer pump 71 Yoke 71a Bottom wall 72 Brush holder L Cleaning liquid S Pump accommodation space

Claims (8)

A washer pump attached to a tank for storing liquid, comprising a pump part for sucking the liquid in the tank and discharging the liquid to the outside of the tank; and a motor body for driving the pump part,
A housing in which a motor housing chamber for housing the motor main body is opened to the axial base end;
A lid that is assembled to the housing and closes the opening on the axially proximal end side of the motor housing chamber;
An elastic body attached to the housing and sealed between the housing and the tank in a state of being attached to the tank;
The motor housing chamber and the housing are provided integrally with the housing and abut against the end on the axial base end side and abut against the elastic body against the end on the axial front end side. An air passage forming portion that forms an air passage bent in at least three directions communicating with the outside ,
The air passage is
An axial passage formed inside the vent passage forming portion and having an opening on the axial tip side closed by the elastic body;
An opening is formed between the end portion on the axial base end side of the air flow passage forming portion and the lid, and is opened to the side bent with respect to the axial passage, and the axial passage and the motor housing chamber are formed. An internal communication opening that communicates;
Between the end on the axial front end side of the air passage forming portion and the elastic body, an opening is formed at the end on the front end side in the axial direction of the air passage forming portion so as to bend with respect to the axial passage. An external communication opening that communicates the axial passage with the outside of the housing;
A washer pump characterized by having In washer pump according to claim 1, wherein the axial passage, washer pump according to claim Rukoto axial opening base end side is closed by the lid.   The washer pump according to claim 2, wherein an end face on the axially proximal end side of the partition partitioning the motor housing chamber and the axial passage is disposed to face the inner surface of the lid body via a gap. The washer pump is characterized in that the internal communication opening is formed between the partition wall and the lid.   4. The washer pump according to claim 2, wherein an external extension passage that is bent with respect to the external communication opening is formed by an external passage extension wall provided in the ventilation passage forming portion so as to face the external communication opening. The washer pump, wherein the external communication passage communicates with the outside of the housing through the external extension passage.   The washer pump according to any one of claims 2 to 4, wherein the axial passage is formed so as to be inclined downward toward the distal end side in the axial direction.   The washer pump according to any one of claims 1 to 5, wherein the motor body is a motor with a brush provided with a brush for power supply, and the brush is held by the lid. .   The washer pump according to any one of claims 1 to 6, wherein the motor body has a cylindrical yoke that opens to both ends in the axial direction.   A washer pump according to any one of claims 1 to 7, and the tank to which the washer pump is attached, wherein the washer pump is inserted in the tank in a state where an axial front end side of the washer pump is inserted into the tank. A washer device, characterized in that:

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