JP2002242894A - Pump motor of two-way exhaust type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump motor including a selector valve installed in its fluid exhaust chamber, whereby the valve has a good sealing performance and a convenience to conduct the installing operation. SOLUTION: A distance T between a front and rear supporting pieces 8m and 8n of the washer liquid exhaust chamber 8 in which the selector valve 9 is installed, is set greater than the fore-and-aft thickness W of the peripheral edge 9a of the selector valve 9 inserted between the supporting pieces 8m and 8n, which allows simple insertion of the selector valve, and the valve 9 can make displacement by that much of the gap formed between the supporting pieces 8m and 8n and the peripheral edge 9a of the valve part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle mounted on a vehicle,
The present invention belongs to the technical field of a two-way discharge type pump motor used for applications such as supplying a washer liquid to a wiper device.

[0002]

2. Description of the Related Art In general, a housing of a pump motor of this kind is provided with a motor chamber in which a motor to be driven forward and backward is accommodated, and a pump chamber in which an impeller for sending fluid through forward and reverse rotation with the driving of the motor is disposed. For example, in a case where this supplies the washer liquid to the wiper device, a fluid discharge chamber is connected to the pump chamber, and a pair of discharge cylinder ports and a fluid discharge port are provided in the fluid discharge chamber. A switching valve formed of an elastic body that opens and closes so as to close one of the cylinder holes of each of the discharge cylinder ports and open the other in response to the delivery, so that the washer liquid supplied to the pump chamber is supplied from each of the discharge cylinder ports. There is known one that selectively discharges (discharges). For example, U.S. Pat.
There is JP-A No. 0361, in which a pair of discharge cylinder ports are provided in a pump chamber and a cover body (end cover) provided at an opening of the pump chamber.
In this device, the switching valve is disposed in a fluid discharge chamber connected to the pump chamber so as to face in the radial direction of the motor shaft, and the peripheral edge of the switching valve is elastically clamped between the pump chamber and the cover body. It is configured to be supported in a shape. Further, in this device, a flow path for guiding the washer liquid to the discharge cylinder opening is formed in each of the pump chamber and the cover body, and the pump chamber side flow path or the cover body side flow path is formed by rotation of the impeller accompanying motor driving. The switching valve is opened and closed by pressure-feeding the washer fluid to either one of the two sides, whereby the washer fluid is discharged from one of the discharge cylinder ports.

[0003]

However, this one is
The discharge cylinder port and the fluid flow path must be separately formed on both the pump chamber side and the cover body, which complicates the structure.In addition, when the pump chamber is attached to the pump chamber by sealing means such as welding. There is a problem that the sealing mounting work becomes difficult. Further, since the respective flow paths are provided in parallel in the motor axis direction, an impeller having to be long in the axial direction must be used in order to cope with this, and the length of the pump chamber portion in the motor axis direction is required. However, there is also a problem that the length of the device becomes longer and hinders miniaturization. Besides,
The switching valve partitions the fluid discharge chamber in a sealed shape, and it is necessary to close one of the two cylindrical holes and open the other, but in this case, the periphery of the switching valve is formed by the pump chamber and the cover body. During the opening / closing operation after receiving the washer liquid, the elastic deformation is exerted, although the sealing property is good. For this reason, when switching the discharge direction, a reaction force is generated in the switching valve to lower the pump efficiency, and in addition, the switching valve may be fatigued or aged due to long-term use. There is a problem because it may not be possible to secure it. On the other hand, as shown in U.S. Pat. No. 5,984,644, a pump chamber is provided with an axially recessed fluid discharge chamber, and a switching valve is inserted and incorporated into the pump chamber, so that an impeller associated with motor driving is provided. There is one in which one side surface of a switching valve is pressed by the pressure of a washer liquid fed by rotation to close the other discharge cylinder hole. This configuration eliminates the need for a flow path on the cover body side, simplifies the structure of the cover body, and allows the impeller to be short in the axial direction, so that the pump motor can It can be made compact in the longitudinal direction. However, in this case, the switching valve is made rigid by fixing a rigid support member to the peripheral portion, and a part of the rigid portion is fitted to the fluid discharge chamber. For this reason, at the time of opening and closing operation of the cylindrical hole of the discharge port, elastic deformation based on rubber elasticity is performed similarly to the above-described switching valve, and the same problem as described above still remains. In addition, the switching valve of this type has a problem that the inner diameter side protrudes to the pump chamber side and there is no partition between the fluid discharge chamber and the pump chamber, so that the pump efficiency cannot be increased. There was a problem to do.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made to solve these problems, and has a motor room in which a forward-reversely driven motor is housed. A pump chamber provided with an impeller for rotating the pump in a forward / reverse direction with the drive of the motor and delivering a fluid, and a pump chamber having a groove formed in a groove in the axial direction of the motor. The fluid discharge chamber includes a pair of discharge cylinder ports opposed to each other, and an elastic body that opens and closes to receive the fluid and close one of the cylinder holes of the discharge cylinder ports and open the other. When the switching valve is provided, the switching valve is inserted with a gap between a pair of support pieces formed in the fluid discharge chamber by insertion with the peripheral portion facing the motor axis direction, and the switching valve is provided. If one of the valves is Along with receiving the fluid delivery to close the hole, the peripheral portion is pressed against the support piece on the closed side, and is configured to partition the fluid discharge chamber into one side and the other side in a sealed manner. Things. With this configuration, it is possible to obtain a pump motor having excellent sealing performance and an excellent pump efficiency while the operation of inserting the switching valve into the fluid discharge chamber is simple. In this case, each of the fluid discharge chambers partitioned by the switching valve of the present invention is formed with a storage chamber, and each of the storage chambers is configured to communicate with a corresponding cylindrical hole. it can. Further in this, the switching valve of the present invention can be configured so that both side surfaces face each storage chamber,
In this manner, the entire switching valve receives the delivery pressure of the fluid, and the sealing performance of the fluid discharge chamber is improved. In this case, the fluid pumped from the pump chamber of the present invention is configured to flow into each storage chamber via the first and second flow paths formed in parallel with each other. Can be. Still further, in this case, the first and second flow paths of the present invention can both be formed so as to be located on the concave groove opening side of the fluid discharge chamber. Further, in this valve, the switching valve of the present invention includes a thick-walled peripheral portion formed in a substantially rectangular shape, a valve body portion facing the discharge cylinder hole, and a position between the valve body portion and the peripheral edge portion. And a thin portion for performing the opening and closing operation of the valve body.

[0005]

FIG. 1 shows an embodiment of the present invention.
Explanation will be made based on the drawings of FIG. In the drawings, reference numeral 1 denotes a pump motor for supplying washer fluid in a washer tank (not shown) to a washer nozzle provided in a wiper device. (Lower side surface which is a cylinder end surface and faces downward with a pump motor attached) A funnel-shaped partition wall 2b is formed integrally with the distal end side (upper end side) and located closer to the inner side of the cylinder following the 2a. The motor chamber M is formed on the distal end side and the pump chamber P is formed on the proximal end side so as to be adjacent to each other in the axial direction via the partition wall 2b.

A yoke 3 is integrally provided on the inner peripheral surface of the cylinder of the motor chamber M, and a pair of permanent magnets 3a are fixed to the inner peripheral surface of the yoke 3. The armature 4 is disposed in the motor chamber M so that the outer peripheral surface of the armature core 4a is opposed to the inner peripheral surface of the permanent magnet 3a. The armature shaft (motor shaft) 5 that constitutes the armature 4 is provided.
Of the housing 2 is supported by a front cover 6 covered by a front end of the housing 2 via a bearing 6a.
Is set to be rotatably supported by the motor chamber M by being supported through a bearing 2d on a cylindrical bearing 2c formed in the partition wall 2b. 5 d is a commutator fixed to the armature shaft 5, and 6 b is an electric connection part formed integrally with the front cover 6.

In the pump chamber P, a base end 5c of the armature shaft 5 protrudes from the bearing 2c of the housing, and the protruding armature shaft base 5c is chamfered in a one-sided shape. The impeller 7 is integrally provided, and is set so that the impeller 7 rotates integrally with the forward / reverse rotation of the armature shaft 5. Further, in the vicinity of the base end side surface 2a of the outer peripheral surface of the housing 2, a suction port 2e communicating with the pump chamber P side for sucking the washer liquid into the pump chamber P is formed so as to protrude outward. .

On the other hand, a washer liquid discharge chamber (corresponding to a fluid discharge chamber of the present invention) 8 protrudes from a portion of the housing base end side surface 2a facing the suction port 2e so as to communicate with the pump chamber P. The washer liquid discharge chamber 8 is recessed toward the distal end side (on the motor chamber M side and upward in the direction of the armature shaft 5), and is formed in a concave groove opening at the base end side. ing. By forming the washer liquid discharge chamber 8 in this manner, the pump chamber P and the washer liquid discharge chamber 8 are horizontally elongated at the base end portion of the housing 2 in the radial direction.

The washer liquid discharge chamber 8 has a rectangular groove bottom surface 8a formed so as to protrude from the outer peripheral surface of the housing 2 in the outer radial direction, and extends from three sides of the groove bottom surface 8a toward the base end. Extended three side pieces (front and rear sides and left side pieces based on FIG. 3A as a front view) 8b, 8
c, 8d and a right side piece 8e which is the outer peripheral surface of the cylinder of the housing 2. And the front and rear pieces 8
b, 8c, a pair of first and second discharge cylinder openings 8
f, 8g are formed so as to protrude into and out of the groove, and the first and second cylindrical hole ends 8h, 8i, which are the inner ends of the discharge cylinder openings 8f, 8g, form a predetermined gap S. And are set to be close to each other. In addition, a projecting portion 8j that extends to the bottom surface is formed at the tip half portion of each of the discharge cylinder openings 8f and 8g that project inside the groove. Further, the inside of the groove of the washer liquid discharge chamber 8, that is, from the left piece 8 d to the groove bottom piece 8.
a, a pair of front and rear support pieces 8m and 8n opposed in the front and rear direction for inserting a switching valve 9 described later are integrally formed on the inner peripheral surface leading to the right piece 8e in a rib shape toward the inside of the groove. The front and rear support pieces 8m and 8n are located before and after the opposing gaps, and the respective discharge cylinder openings 8h and 8i
The first and second storage chambers 8p and 8q communicating with are formed. Incidentally, in the present embodiment, the distance T between the pair of front and rear support pieces 8m and 8n is the same as the facing gap S between the first and second cylindrical hole ends 8h and 8i (T = S). It is set to be. The width of the washer liquid discharge chamber 8 in the left-right direction is set to the groove width H.

Further, an outer side wall 2f is formed on the base side surface 2a of the housing so as to protrude toward the base end side in a state of including (surrounding) the pump chamber P (part facing the partition wall 2b) and the washer liquid discharge chamber 8. The space surrounded by the outer wall 2f is set as a washer liquid reservoir. Then, between the pump chamber P and the washer liquid discharge chamber 8, that is, at the base end of the right piece 8 e of the washer liquid discharge chamber 8, the protrusion protrudes toward the base end with the same protrusion amount as the outer wall 2 f. An inner wall 2g is formed, and a portion (housing end 2a) that retreats to the tip side between the inside of the outer wall 2f and the front and rear ends of the inner wall 2g is a front and rear portion of the washer liquid discharge chamber 8 from the pump chamber P. First and second storage rooms 8
a pair of first and second flow paths F1 and F
2 is set. Incidentally, these two first and second flow paths F1 and F2 are in a mutually parallel relationship,
Further, it is formed on the groove opening side of the washer liquid discharge chamber 8. Reference numeral 2h denotes a sealing groove formed around the outer periphery of the housing base end side surface 2a, and the inner side of the sealing groove 2h is constituted by the outer wall 2f.

The switching valve 9 is integrally formed of a resin material having rubber elasticity such as synthetic rubber.
It is formed in a substantially square outer shape. Further, the four peripheral edges of the switching valve 9 are formed in a thick peripheral portion 9a, and three sides (lower edge, left and right edges) of the thick peripheral portion 9a.
Is inserted between the front and rear support pieces 8m and 8n of the washer liquid discharge chamber 8, whereby the front and rear side surfaces of the switching valve 9 are set to face the first and second storage chambers 8p and 8q. ing. Further, the thickness W of the peripheral portion 9a in the front-rear direction is set to be smaller than the distance T between the opposed front and rear support pieces 8m and 8n (W <T). In the state where the switching valve 9 is inserted between them, a slight gap (clearance, clearance) is provided between the switching valve peripheral portion 9a and the front and rear support pieces 8m and 8n.
(Set by (T−W)) is provided so that displacement in the front-back direction is possible. In addition, the length of one side of the peripheral portion 9a is set to a length D slightly shorter than the width H of the washer liquid discharge chamber 8 in the left-right direction, and thereby, between the support pieces 8m and 8n. When inserted, a slight gap in the left and right direction (clearance, (HD) is set) is provided between the support pieces 8m and 8n and the peripheral edge 9a, whereby the washer of the switching valve 9 is provided. Care is taken to facilitate insertion into the liquid discharge chamber 8. The outer peripheral surface of the four peripheral edge portion 9a of the switching valve is formed in an arc shape, and when inserted between the front and rear support pieces 8m and 8n, the outer end surface is connected to the side pieces 8d, 8a and 8e of the washer liquid discharge chamber 8. It is set so as to make a line contact instead of a plane contact. The length of the switching valve 9 in the vertical direction is set to be longer than the depth of the groove of the washer liquid discharge chamber 8. As will be described later, the opening ends of the washer liquid discharge chamber 8 and the pump chamber P are covered by a cover body 10. When the cover is covered, the support piece 10 formed on the cover body 10 side
The dimension is set so as to be the length to be inserted between a.

The switching valve 9 inserted between the front and rear support pieces 8m and 8n is connected to the first and second storage chambers 8 and 8n.
At this time, a substantially central portion of the switching valve 9 is opposed to the first and second cylindrical hole ends 8h and 8i of the discharge cylinder ports 8f and 8g. The part is formed in the substantially circular valve body 9b. A ring-shaped thin portion 9c for opening and closing the valve portion 9b is formed on an outer peripheral portion of the valve portion 9b, and the thin portion 9c and the valve portion 9b are formed in a peripheral portion. It is formed so as to be deviated to one side from the center line in the front-rear direction of 9a and protrude to one side from one side surface of the peripheral portion 9a (see FIG. 6D), and to the washer liquid discharge chamber 8. In the insertion state, the valve body portion 9b abuts on one of the first and second cylindrical hole ends 8h of the pair of first and second cylindrical hole ends 8g in a resilient manner,
The second or first cylindrical hole end 8i or 8h on the opposite side is set to be supported in a closed state. Incidentally, in the present embodiment, the valve body portion 9b deviated to one side of the switching valve 9 closes the rear end 8i of the second discharge cylinder port. 9d and 9e are two first and second rib-like projections 9d formed continuously around the circumference of the front and rear surfaces of the switching valve peripheral portion 9a.

On the other hand, the end cover 10 is disposed in a protruding manner at the base side surface 2a of the housing, that is, at the opening end of the pump chamber P and the opening end of the washer liquid discharge chamber 8, and covers these openings. However, an engagement protrusion 10a for sealing the pump chamber P is fitted on the front end side surface (upper side surface) of the end cover 10 together with a sealing material in the sealing concave groove 2h on the housing 2 side. Is formed. Further, engagement concave grooves 10b are formed at two locations facing the outer peripheral edge portion of the pump chamber P and two locations facing the inner wall 2g, and the engagement projections protrudingly provided on the housing base end side surface 2a. 2i is set to be fitted and locked. Further, a portion of the end cover 10 facing the washer liquid discharge chamber 8 is formed in a concave groove portion 10c recessed on the base end side, and is located at a central portion in the front and rear direction of the concave groove portion 10c and has a front and rear support piece portion 10d. , 10e are formed in a pair in front and back, and these support pieces 10d,
0e, the switching valve peripheral portion 9a projecting from the housing base end side surface 2a is set to be inserted. These support pieces 10d and 10e are similar to those formed in the washer liquid discharge chamber 8. It is formed with a distance T between facing sides. Here, in a state where the end cover 10 is assembled, the switching valve 9 is in a state of being smoothly assembled (without being elastically deformed) into the washer liquid discharge chamber 8.

Then, the switching valve 9 is inserted and assembled into the washer liquid discharge chamber 8, and the end cover 10 is attached to a state where the lower peripheral edge of the switching valve 9 projects from the base end 2 a of the housing 2. The pump motor 1 is configured by incorporating the components in a sealed manner. In this one,
In the non-operating (stationary) state where the motor unit M is not driven,
As described above, the switching valve 9 is in a state where the valve body 9b closes the second cylindrical hole end 8i on the rear side. At this time, the hydraulic pressures (water pressures) based on the washer fluid in the first and second storage chambers 8p and 8q are equal to each other, and therefore, the switching valve peripheral portion 9a is connected to the washer fluid discharge chamber 8 and the cover. Front and rear support pieces 8m, 8 formed on body 10
Although it can be displaced by the gap (T−W) between n and 10d and 10e (play is possible), the peripheral edge 9
a is in a neutral state in contact with the front support pieces 8m and 10d. In this state, the switching valve peripheral portion 9
a is formed in an arc shape, and the washer liquid storage chamber 8 is formed.
And the end cover 10 is in line contact with the support pieces 8m, 8n, 10d, and 1e.

Next, from the pump chamber P, each discharge cylinder port 8f,
The state of supplying the washer liquid to 8 g will be described. In the non-operating state, the armature shaft 5 on the motor chamber M side
When the impeller 7 of the pump chamber P rotates with the rotation of the pump chamber P, for example, as shown in FIG. 4B, when the impeller 7 rotates in the direction of arrow X, the washer liquid supplied to the pump chamber P from the suction port 2e is In response to the rotation of the impeller 7, the impeller 7 is pressure-fed in the direction of arrow X, that is, toward the first flow path F <b> 1 on the front side, and the washer liquid passes through the first flow path F <b> 1 and the first storage chamber 8 p on the front side of the washer liquid discharge chamber 8. Supplied to the side. And
When the water pressure in the first storage chamber 8p becomes higher than the water pressure in the second storage chamber 8q due to the supply of the washer liquid to the first storage chamber 8p, the water pressure acts to push the switching valve 9 toward the second storage chamber 8q. The switching valve 9
Is displaced toward the second storage chamber 8q by the difference (T−W) between the distance T between the opposed support pieces 8m and 8n and the thickness W of the switching valve 9, so that the peripheral edge 9a is moved to the washer liquid discharge chamber. 8 and the cover body 10 are pressed against the rear support pieces 8n and 10e (FIG. 4B). At this time,
The first and second ribs 9 are provided on both sides of the switching valve peripheral portion 9a.
d and 9e are formed, and one or both of the first and second ribs 9d and 9e formed on the side surface (rear side surface) of the second storage chamber 8q are pressed against the rear support pieces 8n and 10e. The switching valve 9 is set so as to partition the first and second storage chambers 8p and 8q in a sealed manner. Then, in this state, when the rotation of the armature shaft 5 is further performed, the washer liquid is supplied to the first storage chamber 8p, and the washer liquid is discharged from the first discharge cylinder port 8f side. Incidentally, when the supply of the washer fluid is stopped (when the rotation of the armature shaft 5 is stopped), the switching valve 9 is displaced toward the first storage chamber 8p due to a decrease in the water pressure in the first storage chamber 8p. However, at this time, the switching valve 9 does not perform the switching operation of the valve body 9b, and no reaction force is generated in the switching valve 9.

On the other hand, when the impeller 7 rotates in the direction opposite to the arrow X, the washer liquid is supplied to the second storage chamber 8q from the rear second flow path F2, contrary to the above. And
When the water pressure in the second storage chamber 8q becomes higher than the water pressure in the first storage chamber 8p due to the supply of the washer liquid to the second storage chamber 8q, the water pressure acts to push the switching valve 9 toward the first storage chamber 8p. As a result, the switching valve 9 is displaced toward the first storage chamber 8p by the difference (T−W),
The peripheral portion 9a includes the washer liquid discharge chamber 8 and the cover body 10.
Is pressed against the front support piece portions 8m and 10d formed on the front side. At this time, the first storage chamber 8 of the switching valve peripheral portion 9a
First and second ribs 9d, 9 formed on the p-side (front side)
e, or both of the front support pieces 8m, 10d
The sealing between the first and second storage chambers 8p and 8q is performed by the switching valve 9. Further, in this case, the valve body portion 9b is pushed to the first storage chamber 8p side based on the fact that the thin portion 9c is elastically deformed from the posture of closing the second cylindrical hole end 8i by the water pressure,
The opening and closing operation of closing the end 8h of the first discharge cylinder mouth is set so that the washer liquid supplied to the second storage chamber 8q is discharged from the second discharge cylinder mouth 8g. By the way, when the sending of the washer fluid to the side is completed, the switching valve 9 loses the water pressure facing the first storage chamber 8p side, and returns to the elastic deformation state, the posture of the non-operating state,
That is, it is set so as to return to the posture of closing the second cylindrical hole end 8i. The entire periphery of the switching valve peripheral portion 9a is supported by the front and rear support pieces 8m, 8n, 10d, and 10e, and the support pieces 8m or 8n corresponding to the contact state when receiving the water pressure of the washer liquid. 10d or 10e is abutted to receive a fixed support, so that the opening / closing operation (switching operation) based on the elastic deformation of the thin portion 9c of the switching valve valve body 9b can be more efficiently performed. Is set.

In the embodiment of the present invention configured as described above, as described above, when the impeller 7 of the pump chamber P rotates as the motor of the motor chamber M is driven, the washer fluid is changed to the washer fluid. The washer liquid is sent out to one of the first and second storage chambers 8p and 8q formed in the discharge chamber 8, and the washer liquid is discharged from any of the corresponding first and second discharge cylinder ports 8f and 8g based on the sending pressure. Discharge. In this case, a switching valve 9 arranged in the washer liquid discharge chamber 8 for selectively opening or closing any one of the first and second cylindrical hole ends 8h and 8i is provided in the first and second storage chambers 8p. , 8q is sealed so that the pump pressure can be ensured, but the replacement valve 9 inserted and assembled (fitted and assembled) in the axial direction of the armature shaft 5 has a peripheral edge 9a. There is a predetermined gap (T-W) between the support pieces 8m, 8n and 10d, 10e, and a predetermined width (H) of the washer liquid discharge chamber 8 in the left-right direction. Since the gap (HD) is present, the insertion operation can be simplified. Moreover, in this case, when the washer fluid is sent out to one of the storage chambers 8p or 8q and a hydraulic pressure (water pressure) acts on the switching valve 9, the switching valve valve body is formed based on the elastic deformation of the thin portion 9c. 9b is opened and closed so as to close the first and second cylindrical hole ends 8i or 8h.
Of the thin portion 9
The elastic deformation of c may be small, and the fatigue and aging of the switching valve 9 can be reduced. In addition, at this time, the switching valve 9 closely contacts the first and second storage chambers 8p and 8q formed in the washer liquid discharge chamber 8 to the support piece 8m or 8n so as to be sealed with each other, so that the pump efficiency is improved. It can be good. Moreover, in this embodiment, the first and second discharge ports 8f and 8g and the first and second flow paths F1 and F2 between the pump chamber P and the washer liquid discharge chamber 8 are both formed on the housing 2 side. Therefore, not only can the structure of the end cover 10 be simplified, but also the work of assembling the end cover 10 to the housing 2 with sealing means can be facilitated.

As described above, according to the embodiment of the present invention, the opening and closing operation of the valve body 9b is performed by the water pressure caused by the supply of the washer fluid to the first and second storage chambers 8p and 8q. In this case, however, the switching valve 9 receives the water pressure of the washer liquid in the entire switching valve 9 because the entire valve surface (both sides) faces the first and second storage chambers 8p and 8q. As a result, the opening / closing operation based on the elastic deformation of the thin portion 9c of the valve body 9b and the sealing by the peripheral edge 9a are ensured.

Further, in this case, the first and second flow paths F
Both F1 and F2 are formed on the opening side of the pump chamber P and at the front and rear sides and in parallel with each other. Therefore, when the washer pump 1 is mounted, the first and second flow paths F
1, the washer liquid sent out via F2 is sent out to the first and second storage chambers 8p and 8q along the tangential direction of the pump chamber P, and the washer liquid accompanying the rotation of the impeller 7 The efficiency of sending to the first and second storage chambers 8p and 8q can be improved. Further, each of the first and second flow paths F1, F2
Since is located at the lower end of the pump chamber P, there is no problem that air enters the first and second storage chambers 8p and 8q, and the pump efficiency can be improved.

In this embodiment, the switching valve 9
The valve element 9b is formed so as to be deviated so as to protrude to one side from the side surface of the peripheral portion 9a, and when the washer pump 1 is not operated, the valve element 9b is disposed on the deviated side of the discharge cylinder The hole end 8i is closed. As a result,
By using the first discharge cylinder port 8f which is opened in a non-operating state as a supply path to the frequently used front window side, it is possible to reduce the occurrence of a reaction force in the switching valve 9 and to improve the functionality. An excellent washer pump can be provided. Further, this can be configured as a washer pump that discharges the washer fluid only from the one-way discharge cylinder port. In this case, a highly efficient washer pump with high pump efficiency can be obtained. It can correspond to any form of a mold and a two-way discharge mold.

The present invention is, of course, not limited to the above-described embodiment, and the switching valve can be adopted without being limited to the valve body portion deviated to the peripheral portion. It goes without saying that a storage chamber that does not have a storage chamber can also be used.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a pump motor.

FIG. 2 is a front sectional view of a housing.

FIGS. 3A and 3B are a front sectional view of the housing and a sectional view taken along line XX of FIG. 3A, respectively.

FIGS. 4A and 4B are a plan view and a bottom view of the housing, respectively.

FIGS. 5A, 5B, and 5C are a bottom view of the end cover, a cross-sectional view taken along line XX of FIG. 5A, and a plan view, respectively.

FIGS. 6A, 6B, 6C, and 6D are a front view, a side view, a rear view, and a cross-sectional view of a switching valve, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump motor 2 Housing 2a Base side surface 2b Partition wall 2e Inlet 2f Outer side wall 2g Inner side wall 2h Sealing concave groove 3 Yoke 4 Armature 5 Armature shaft 6 Front cover 7 Impeller 8 Washer liquid discharge chamber 8a Groove bottom surface 8f First discharge Tube opening 8i Second cylindrical hole end 8m Front support piece 8p First storage chamber 9 Switching valve 9a Peripheral edge 9b Valve body 9c Thin part 10 End cover 10d Front support piece

Claims (6)

[Claims] 1. The pump chamber of a pump motor, comprising: a motor chamber in which a motor to be driven forward and backward is housed; A fluid discharge chamber in the form of a groove in the axial direction of the motor is connected to the fluid discharge chamber. And a switching valve formed of an elastic body that opens and closes to open the other while closing the other, the switching valve includes a pair of support members formed in the fluid discharge chamber by insertion with the peripheral portion facing the motor axis direction. The peripheral part is pressed against the supporting piece on the closed side as the switching valve receives fluid delivery to close one of the cylindrical holes, with a gap between the pieces. The fluid discharge chamber on one side A two-way discharge type pump motor configured to partition in a sealed manner with the other side. 2. A storage chamber is formed in each of the fluid discharge chambers separated by the switching valve according to claim 1,
A two-way discharge type pump motor configured such that each of the storage chambers communicates with a corresponding cylindrical hole. 3. The two-way discharge type pump motor according to claim 2, wherein the switching valve is configured so that both side surfaces face each storage chamber. 4. The fluid according to claim 2, wherein the fluids pumped from the pump chamber are formed in parallel with each other.
A two-way discharge type pump motor configured to flow into each storage chamber via the second flow path. 5. The first and second flow paths according to claim 4,
Both are two-way discharge type pump motors formed on the concave groove opening side of the fluid discharge chamber. 6. The switching valve according to claim 1, wherein the switching valve has a thick peripheral portion formed in a substantially square shape, a valve body facing the discharge cylinder hole, and the valve. A two-way discharge type pump motor including a thin portion located between a body portion and a peripheral portion for performing an opening / closing operation of a valve body portion.