JP2012154177A - Pump device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device which prevents disconnection between a second outlet on a rear window glass side and a hose, while suppressing increase in cost.SOLUTION: In the pump device 10 for a vehicle, a pump chamber side 18D of a pump body 12 is located inside a tank 84, and a flow passage 56 for pressure reduction is formed in an end housing 24 disposed in the pump chamber side 18D of the pump body 12 and constituting a pump chamber 46. In the housing 24, the flow passage 56 communicates with a second body discharge flow passage 38B on a rear window glass side and allows a part of a fluid to flow from the pump chamber 46 into the tank 84. When the fluid sucked into the pump chamber 46 is discharged from an outlet 42B of the second body discharge flow passage 38B, a part of the fluid is returned into the tank 84 through the flow passage 56 for pressure reduction, discharge pressure at a second discharge port 76B connected to the rear window glass side is consequently reduced compared to discharge pressure at a first discharge port 76A connected to a front window glass side.

Description

  The present invention relates to a vehicle pump device.

  2. Description of the Related Art Conventionally, there is a washer pump device that discharges cleaning liquid alternatively to a front window glass and a rear window glass of a vehicle (see, for example, Patent Document 1). This washer pump device is a so-called in-tank type washer pump device in which a large part of the pump body is inserted into the washer tank, and the pump body includes a motor unit in which a motor for rotating the impeller is disposed. And an impeller is disposed and a pump unit that discharges the cleaning liquid.

  The pump unit includes a pump chamber in a substantially cylindrical housing in which an impeller fixed to a rotation shaft of a motor capable of rotating in the forward and reverse directions of the motor unit is accommodated. Further, the pump chamber is provided with communication holes communicating with the outlets on the front window glass side and the rear window glass side, respectively, and the impeller is rotated in the forward and reverse directions by the motor so that the cleaning liquid is transferred to the front window glass side. And are discharged alternatively to the rear window glass side.

Japanese Patent No. 4527352

  By the way, the supply of cleaning liquid by the rotation of the impeller is alternative to the front window glass side and the rear window glass side by rotating forward and reverse using a common motor on the front window glass side and the rear window glass side. Has been made. For this reason, the discharge pressure at the front window glass side and the rear window glass side discharge pressure on the front window glass side requires a high cleaning liquid injection pressure that does not lose airflow even at high speeds, whereas the rear window glass side Then, since the influence by the airflow is small, a low injection pressure is sufficient. Therefore, in order to make a difference in the spray pressure of the cleaning liquid to each window glass, it is necessary to take measures such as providing a control circuit for controlling the motor rotation speed on the front window glass side and the rear window glass side, which increases the cost. It was the cause.

  Furthermore, since the washer tank is usually placed in the engine room, the distance between each spray nozzle set on each window glass and the washer pump is farther on the rear window glass side than on the front window glass side, so The length of the hose (tube) to be supplied also becomes longer on the rear window glass side. Therefore, when the hose is routed in the vehicle, the hose may be bent in the middle and the cleaning liquid may be blocked. In this case, there is a problem that the pressure in the hose is increased, and the outlet on the rear window glass side is disconnected from the hose.

  This invention is made | formed in view of the said subject, Comprising: Providing the vehicle pump apparatus which can suppress that the connection with the 2nd outlet by the side of a rear window glass and a hose is removed, suppressing a cost increase. Objective.

  In order to solve the above-described problem, the vehicle pump device according to claim 1 is formed with a pump chamber in which an impeller is disposed and a motor housing chamber in which a motor that rotationally drives the impeller is housed. By rotating the impeller forward and backward by the motor, the liquid in the tank is sucked into the pump chamber through the suction hole, and the sucked liquid is pressurized from the outlets of the first main body discharge channel and the second main body discharge channel. Discharge with a difference, and the pump chamber side is located inside the tank and is attached to the tank, and the outlets of the first main body discharge flow path and the second main body discharge flow path Either the first outlet or the second outlet formed in the first outlet and the second outlet based on the pressure difference of the liquid flowing in from the first inlet and the second inlet connected to each other A valve that discharges liquid and selectively supplies the liquid to a front window glass side injection nozzle and a rear window glass side injection nozzle connected to the first discharge port and the second discharge port, respectively. The pump body is fixed to the housing body in which the first body discharge flow path and the second body discharge flow path are formed, and to the end of the housing body on the pump chamber side. An end housing that forms the pump chamber together with the housing main body, and the end housing communicates with the second main body discharge passage, and a part of the liquid flows out of the pump chamber into the tank. Possible decompression flow paths are formed.

  According to this vehicle pump device, the pump chamber side of the pump body is located inside the tank, and the end housing that is provided on the pump chamber side of the pump body and constitutes the pump chamber has the second body A pressure reducing flow path is formed which communicates with the discharge flow path and allows a part of the liquid to flow from the pump chamber into the tank. Therefore, when the impeller is reversely rotated by the motor and the liquid sucked into the pump chamber is discharged from the outlet of the second main body discharge flow path, a part of the liquid is returned to the tank through the pressure reducing flow path. Therefore, the discharge pressure of the 2nd discharge port connected to the rear window glass side can be reduced compared with the discharge pressure of the 1st discharge port connected to the front window glass side. Thereby, it can suppress that the connection of the 2nd outlet by the side of a rear window glass and a hose remove | deviates.

  Further, paying attention to the fact that the end housing is disposed in the tank, it is possible to suppress an increase in cost because it is a simple configuration in which a pressure reducing flow path is formed in the end housing.

  Moreover, the second discharge port connected to the rear window glass side without changing the size (cross-sectional area) of the pressure reducing flow path formed in the end housing without requiring redesign of members other than the end housing. It is possible to easily adjust the discharge pressure.

  The vehicle pump device according to claim 2 is the vehicle pump device according to claim 1, wherein an inlet of the pressure reducing flow path is formed with a smaller cross-sectional area than an inlet of the second main body discharge flow path. ing.

  According to this vehicular pump device, the inlet of the pressure reducing flow path is formed with a smaller cross-sectional area than the inlet of the second main body discharge flow path, while suppressing the inflow of liquid into the pressure reducing flow path ( The discharge pressure of the second discharge port can be reduced as compared with the discharge pressure of the first discharge port (while ensuring the supply of liquid to the second main body discharge channel).

  The vehicle pump device according to claim 3 is the vehicle pump device according to claim 1 or 2, wherein the pump body is a centrifugal pump, and the end housing is on a central axis of the impeller. In addition, the suction hole is formed, and the pressure reducing flow path is formed on the radially outer side of the impeller with respect to the suction hole.

  According to this vehicular pump device, the pressure reducing flow path is formed on the outer side of the end housing (where the pressure is high in the centrifugal pump) (outside in the radial direction of the impeller from the suction hole formed on the central axis of the impeller). ). Thereby, when the liquid sucked into the pump chamber is discharged from the outlet of the second main body discharge flow path, a part of the liquid can be efficiently returned to the tank through the pressure reducing flow path.

  The vehicle pump device according to claim 4 is the vehicle pump device according to claim 3, wherein the end housing is made of resin, and the pressure reducing flow path extends along a central axis of the impeller. Is formed.

  According to this vehicle pump device, the pressure reducing flow path is formed along the central axis of the impeller in the end housing made of resin. Therefore, for example, when the end housing is resin-molded, a mold that is divided in a direction corresponding to the axial direction of the impeller may be used. Therefore, since it is not necessary to use, for example, a slide type for forming the pressure reducing flow path, it is easy to form the pressure reducing flow path, and the cost increase can be further effectively suppressed.

It is side surface sectional drawing which shows the state by which the vehicle pump apparatus which concerns on one Embodiment of this invention was attached to the tank. FIG. 2 is a sectional view taken along line 2-2 of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a vehicle pump device 10 according to an embodiment of the present invention includes a pump body 12 and a valve device 14.

  The pump main body 12 is a centrifugal pump, and includes a motor 16, a housing main body 18, an impeller 20, a connector cap 22, and an end housing 24. The motor 16 is for driving the impeller 20 to rotate, and can rotate the rotating shaft 26 forward and backward according to a power supply voltage supplied from the outside.

  The housing body 18 is made of resin, for example, and is formed in a substantially bottomed cylindrical shape. A motor housing chamber 28 that houses the motor 16 and first and second axial flow paths 30 </ b> A and 30 </ b> B that extend in parallel along the motor housing chamber 28 are formed in the housing body 18. The first and second axial flow paths 30 </ b> A and 30 </ b> B are formed close to each other radially outside the motor housing chamber 28 (see FIG. 2). A through hole 32 that penetrates in the axial direction of the motor 16 is formed in the bottom 18 </ b> A of the housing body 18. The distal end portion of the rotating shaft 26 is inserted into the through hole 32, and the impeller 20 is coaxially fixed to the protruding portion protruding from the through hole 32 at the distal end portion of the rotating shaft 26.

  On the opening 18B side of the housing body 18, first and second connecting pipes 34A and 34B projecting radially outward are formed in parallel. The first and second radial flow paths 36A and 36B formed inside the first and second connection pipes 34A and 34B are communicated with the first and second axial flow paths 30A and 30B, respectively. The first and second axial flow paths 30A and 30B constitute first and second main body discharge flow paths 38A and 38B, respectively.

  One end of each of the first and second main body discharge flow paths 38A and 38B (that is, the open end of the first and second axial flow paths 30A and 30B) is connected to the end face 18C on the bottom 18A side of the housing main body 18 at the inlet 40A. , 40B, and the other ends of the first and second main body discharge channels 38A, 38B (that is, the open ends of the first and second radial channels 36A, 36B) are the first and second Openings 42A and 42B are opened at the protruding ends of the connecting pipes 34A and 34B.

  The connector cap 22 has a structure in which a connector portion 44 for supplying a power supply voltage to the motor 16 is integrally formed. The connector cap 22 is provided on the opening 18B side of the housing body 18 and closes the opening 18B.

  The end housing 24 is fixed to the bottom 18 </ b> A (the end on the pump chamber 46 side) of the housing body 18. The end housing 24 is formed with an impeller accommodating recess 24A that opens to the housing body 18 side. When the end housing 24 is fixed to the bottom 18A of the housing main body 18, the impeller 20 is disposed by the inner wall surface 24B of the impeller receiving recess 24A and the end surface 18C of the housing main body 18 on the bottom 18A side. A chamber 46 is formed.

  Further, as shown in FIG. 2, first and second communication passages 48 </ b> A and 48 </ b> B are formed in the end housing 24 along the substantially tangential direction of the impeller 20. The first and second communication passages 48A and 48B connect the pump chamber 46 and the first and second main body discharge passages 38A and 38B (first and second axial passages 30A and 30B), respectively. . Further, as shown in FIG. 1, the end housing 24 is formed with a recess 50 on the side opposite to the housing body 18 side with respect to the impeller receiving recess 24 </ b> A. The recess 50 is opened on the side opposite to the housing body 18 side, and a plurality of ribs 52 are formed radially inside the recess 50.

  Further, the end housing 24 is formed with a suction hole 54 and a pressure reducing channel 56. Each of the suction hole 54 and the pressure reducing flow path 56 penetrates along the central axis of the impeller 20. The suction hole 54 is formed on the central axis of the impeller 20, and the pressure reducing flow path 56 is formed on the radially outer side of the impeller 20 with respect to the suction hole 54. In the present embodiment, as an example, the pressure reducing flow path 56 is formed substantially coaxially with the second axial flow path 30B.

  The pressure reducing flow channel 56 communicates with the second axial flow channel 30B (second main body discharge flow channel 38B), and the inlet 56A of the pressure reducing flow channel 56 is the inlet of the second main body discharge flow channel 38B. The cross-sectional area is smaller than 40B. The pressure reducing flow channel 56 and the second main body discharge flow channel 38B are formed with a constant cross-sectional area in the longitudinal direction.

  As shown in FIG. 2, the valve device 14 includes first and second divided housings 58 </ b> A and 58 </ b> B constituting a valve housing, and a valve body 60.

  The first and second divided housings 58A and 58B include main body portions 62A and 62B, outer extension portions 64A and 64B, first and second inflow cylinder portions 66A and 66B, and first and second inner extension cylinder portions 68A, 68B, and first and second extending cylinder portions 70A and 70B as first and second outlets.

  The main body portions 62A and 62B are formed in a substantially bottomed cylindrical shape, and the insides thereof are formed as first and second valve chambers 72A and 72B, respectively. The outwardly extending portions 64A and 64B are extended radially outward from the peripheral portions on the opening side of the main body portions 62A and 62B, and the fitting portions (not shown) of the outwardly extending portions 64A and 64B are fitted and fixed. The first and second divided housings 58A and 58B are assembled with each other.

  The first and second inflow tube portions 66A and 66B are formed to protrude radially outward from the bottom side of the outer extension portions 64A and 64B in the main body portions 62A and 62B. The valve device 14 is fixed to the pump body 12 by fitting the first and second inflow tube portions 66A and 66B to the first and second connection pipes 34A and 34B. Further, first and second inflow ports 74A and 74B connected to the respective outlets 42A and 42B of the first and second main body discharge channels 38A and 38B are opened on the outer peripheral portions of the main body portions 62A and 62B. Yes.

  The first and second inwardly extending cylindrical portions 68A and 68B are formed so as to protrude from the center of the bottom of the main body portions 62A and 62B to the inside of the main body portions 62A and 62B. The first and second outwardly extending cylindrical portions 70A and 70B are The main body parts 62A and 62B are formed so as to protrude from the center of the bottom part to the outside of the main body parts 62A and 62B. The first inner extending cylinder part 68A and the first outer extending cylinder part 70A, and the second inner extending cylinder part 68B and the second outer extending cylinder part 70B are coaxially formed. Moreover, the opening of the front end side of 1st and 2nd extending cylinder part 70A, 70B is formed as 1st and 2nd discharge outlet 76A, 76B.

  The valve body 60 is made of, for example, an elastic material such as a rubber material, and has a substantially disk shape. The valve body 60 includes an annular outer peripheral edge portion 78, an annular thin wall portion 80 formed inside the outer peripheral edge portion 78 and thinner than the outer peripheral edge portion 78, and a disc shape formed inside the thin wall portion 80. Thus, the valve body 82 is thicker than the thin portion 80.

  And this valve body 60 is assembled | attached to the 1st and 2nd division | segmentation housings 58A and 58B because the outer periphery part 78 is clamped by the extension parts 64A and 64B. In a state where the valve body 60 is assembled to the first and second divided housings 58A and 58B, the first valve chamber 72A and the second valve chamber 72B are partitioned by the valve body 60. Further, the valve main body 82 is located between the distal end portion of the first inner extending cylindrical portion 68A and the distal end portion of the second inner extending cylindrical portion 68B, and the thin portion 80 defines the first inner extending cylindrical portion 68A. It is elastically supported so that it can come into contact with the distal end portion and the distal end portion of the second inwardly extending cylindrical portion 68B.

  Next, the assembly state and operation of the above-described vehicle pump device 10 to the tank 84 will be described.

  As shown in FIG. 1, the vehicle pump device 10 employs a so-called in-tank mounting structure, and the pump body 12 is positioned so that the pump chamber side 18 </ b> D of the pump body 12 is located inside the tank 84. , Attached to the tank 84. A seal member 88 is provided between the inner peripheral surface of the mounting hole 86 formed in the tank 84 and the outer peripheral surface of the pump body 12. Further, the first and second outer cylinder portions 70A and 70B (first and second discharge ports 76A and 76B) of the valve device 14 are both used for a vehicle front window glass and a rear window glass via a hose or the like not shown. Connected to the injection nozzle.

  In the vehicle pump device 10, when the motor 16 is driven and the rotating shaft 26 and the impeller 20 are rotated in the forward direction (clockwise in FIG. 2), the cleaning liquid (liquid) in the tank 84 is sucked into the suction hole 54. The cleaning liquid sucked into the pump chamber 46 is supplied to the first main body discharge flow path 38A through the first series passage 48A with a large positive pressure. At this time, a small positive pressure is also applied to the second main body discharge flow path 38B side, but this pressure is sufficiently smaller than the positive pressure of the first main body discharge flow path 38A.

  Then, the cleaning liquid is discharged with a pressure difference from the outlets 42A and 42B of the first main body discharge flow path 38A and the second main body discharge flow path 38B, and the first of the valve device 14 communicated with the first main body discharge flow path 38A. The pressure in the one valve chamber 72A becomes a large positive pressure, and the pressure in the second valve chamber 72B communicating with the second main body discharge channel 38B becomes a small positive pressure.

  Further, by this, the valve main body portion 82 is pressed and brought into contact with the distal end portion of the second extending cylindrical portion 68B on the second valve chamber 72B side by the pressure difference between the first valve chamber 72A and the second valve chamber 72B. The second discharge port 76B is closed. On the other hand, the first discharge port 76A is opened, and the cleaning liquid is discharged only from the first discharge port 76A. As a result, the cleaning liquid is injected (supplied) only to the front window glass of the vehicle.

  On the other hand, when the motor 16 is driven reversely and the rotating shaft 26 and the impeller 20 are rotated in the reverse direction (rotated counterclockwise in FIG. 2), the cleaning liquid in the tank 84 is sucked into the pump chamber 46 from the suction hole 54. Then, the cleaning liquid sucked into the pump chamber 46 is supplied with a large positive pressure to the second main body discharge flow path 38B through the second communication path 48B. At this time, a small positive pressure is also applied to the first main body discharge flow path 38A side.

  Then, the cleaning liquid is discharged with a pressure difference from the outlets 42A and 42B of the first main body discharge flow path 38A and the second main body discharge flow path 38B, and the first of the valve device 14 communicated with the second main body discharge flow path 38B. The pressure in the two-valve chamber 72B becomes a large positive pressure, and the pressure in the first valve chamber 72A communicating with the first main body discharge channel 38A becomes a small positive pressure.

  Further, by this, the valve main body portion 82 is pressed and brought into contact with the distal end portion of the first inwardly extending cylindrical portion 68A on the first valve chamber 72A side due to the pressure difference between the first valve chamber 72A and the second valve chamber 72B. The first discharge port 76A is closed. On the other hand, the second discharge port 76B is opened, and the cleaning liquid is discharged only from the second discharge port 76B. As a result, the cleaning liquid is injected (supplied) only to the rear window glass of the vehicle.

  As described above, in the valve device 14, the cleaning liquid is discharged from either the first discharge port 76 </ b> A or the second discharge port 76 </ b> B based on the pressure difference between the cleaning liquid flowing in from the first inlet 74 </ b> A and the second inlet 74 </ b> B. The cleaning liquid is alternatively supplied to the front window glass side and the rear window glass side of the vehicle.

  Further, as described above, when the cleaning liquid sucked into the pump chamber 46 is discharged from the outlet 42B of the second main body discharge flow path 38B, a part of the cleaning liquid passes through the pressure reducing flow path 56 and enters the tank 84. Returned to As a result, the discharge pressure of the second discharge port 76B connected to the rear window glass side is reduced compared to the discharge pressure of the first discharge port 76A connected to the front window glass side.

  Next, the operation and effect of one embodiment of the present invention will be described.

  As described in detail above, according to the vehicle pump device 10, the pump chamber side 18 </ b> D of the pump body 12 is located inside the tank 84, and is provided on the pump chamber side 18 </ b> D of the pump body 12. The end housing 24 constituting the chamber 46 is formed with a pressure reducing channel 56 that communicates with the second main body discharge channel 38 </ b> B and allows a part of the liquid to flow out from the pump chamber 46 into the tank 84.

  Therefore, when the impeller 20 is reversely rotated by the motor 16 and the liquid sucked into the pump chamber 46 is discharged from the outlet 42B of the second main body discharge flow path 38B, a part of this liquid is reduced in the pressure reducing flow path described above. 56, the discharge pressure of the second discharge port 76B connected to the rear window glass side can be reduced compared to the discharge pressure of the first discharge port 76A connected to the front window glass side. it can. Thereby, it can suppress that the connection of the hose and the second extended cylinder part 70B on the rear window glass side is disconnected. Since the discharge pressure is reduced by returning a part of the liquid into the tank 84 through the pressure reducing channel 56, there is no waste of liquid due to the reduced pressure.

  In addition, paying attention to the fact that the end housing 24 is disposed in the tank 84, a simple configuration in which the pressure reducing flow channel 56 is formed in the end housing 24 can suppress the increase in cost.

  In addition, it is possible to connect the rear window glass side to the rear window glass side only by changing the size (cross-sectional area) of the pressure reducing flow path 56 formed in the end housing 24 without requiring redesign of members other than the end housing 24. It is possible to easily adjust the discharge pressure of the two discharge ports 76B.

  Further, since the inlet 56A of the pressure reducing flow path 56 is formed with a smaller cross-sectional area than the inlet 40B of the second main body discharge flow path 38B, the flow of liquid into the pressure reducing flow path 56 is suppressed (second). While ensuring the supply of liquid to the main body discharge flow path 38B), the discharge pressure of the second discharge port 76B can be reduced compared to the discharge pressure of the first discharge port 76A.

  Further, the pressure reducing flow path 56 is provided on the outer side of the end housing 24 where the pressure is high in the centrifugal pump (outside in the radial direction of the impeller 20 from the suction hole 54 formed on the central axis of the impeller 20). Is formed. Thereby, when the liquid sucked into the pump chamber 46 is discharged from the outlet 42B of the second main body discharge flow path 38B, a part of the liquid is efficiently introduced into the tank 84 through the pressure reducing flow path 56 described above. Can be returned.

  The decompression flow path 56 is formed along the central axis of the impeller 20 in the end housing 24 made of resin. Therefore, for example, when the end housing 24 is resin-molded, a mold that is divided in a direction corresponding to the axial direction of the impeller 20 may be used. Therefore, since it is not necessary to use a slide type or the like for forming the pressure reducing flow path 56, it is easy to form the pressure reducing flow path 56, and the cost increase can be further effectively suppressed.

  Next, a modification of one embodiment of the present invention will be described.

  In the above embodiment, the pressure reducing flow path 56 is formed substantially coaxially with the second axial flow path 30B, but is formed on the radially inner side of the end housing 24 with respect to the second axial flow path 30B. (The inlet 56A may open in the middle in the longitudinal direction of the second communication passage 48B).

  Further, the end housing 24 may be formed with a pressure reducing flow path similar to the pressure reducing flow path 56 in communication with the first axial flow path 30A (first main body discharge flow path 38A). However, in this case, the pressure reducing flow path 56 communicated with the second axial flow path 30B so that the discharge pressure of the second discharge opening 76B is reduced as compared with the discharge pressure of the first discharge opening 76A. It is desirable that the cross-sectional area be set smaller than the cross-sectional area of the pressure reducing flow path communicating with the first axial flow path 30A.

  With this configuration, the vehicular pump device having a large discharge pressure can be used as a low-pressure vehicular pump device, and the cost is reduced due to the mass production effect due to the increase in the number of pump bodies 12 excluding the end housing 24. be able to.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Pump apparatus for vehicles, 12 ... Pump main body, 14 ... Valve apparatus, 16 ... Motor, 18 ... Housing main body, 20 ... Impeller, 22 ... Connector cap, 24 ... End housing, 24A ... Impeller accommodating recess, 26 ... Rotating shaft, 28 ... Motor accommodating chamber, 30A, 30B ... First and second axial flow paths, 32 ... Through holes, 34A, 34B ... first and second connecting pipes, 36A, 36B ... first and second radial flow paths, 38A, 38B ... first and second main body discharge flow paths, 40A , 40B... Each inlet of the first and second main body discharge channels, 42A, 42B... Each outlet of the first and second main body discharge channels, 44... Connector portion, 46. 48A, 48B ... first and second communication passages, 50 ... recess, 52・ Rib, 54... Suction hole, 56... Pressure reducing channel, 56 A... Pressure reducing channel inlet, 58 A, 58 B. 62A, 62B ... Main body, 64A, 64B ... Outward extension, 66A, 66B ... First and second inflow cylinders, 68A, 68B ... First and second inward extension cylinders, 70A, 70B ... 1st and 2nd extension cylinder part (1st and 2nd outlet), 72A, 72B ... 1st and 2nd valve chamber, 74A, 74B ... 1st and 2nd inflow port 76A, 76B ... first and second outlets, 78 ... outer peripheral edge, 80 ... thin wall, 82 ... valve body, 84 ... tank, 86 ... mounting hole , 88... Sealing member

Claims (4)

A pump chamber in which the impeller is disposed and a motor storage chamber in which a motor that rotationally drives the impeller is formed, and by rotating the impeller forward and backward by the motor, the liquid in the tank is sucked through the suction hole. The liquid sucked into the pump chamber is discharged from each outlet of the first main body discharge channel and the second main body discharge channel with a pressure difference, and the pump chamber side is located inside the tank. A pump body attached to the tank;
Based on the pressure difference between the first inlet and the second inlet connected to the outlets of the first main body discharge channel and the second main body discharge channel, respectively, the first outlet and the second outlet. A jet nozzle on the front window glass side of a vehicle, which discharges liquid from either the formed first discharge port or the second discharge port, and is connected to the first discharge port and the second discharge port, respectively. And a valve device that alternatively supplies to the injection nozzle on the rear window glass side,
With
The pump body includes a housing body in which the first body discharge passage and the second body discharge passage are formed, and is fixed to an end portion of the housing body on the pump chamber side, together with the housing body, the pump chamber An end housing, and
The end housing is formed with a depressurizing flow path that communicates with the second main body discharge flow path and allows a part of the liquid to flow out from the pump chamber into the tank.
Vehicle pump device. The inlet of the pressure reducing channel is formed with a smaller cross-sectional area than the inlet of the second main body discharge channel,
The vehicular pump device according to claim 1. The pump body is a centrifugal pump,
The end housing is configured such that the suction hole is formed on a central axis of the impeller, and the pressure reducing flow path is formed on a radially outer side of the impeller from the suction hole.
The vehicle pump device according to claim 1 or 2. The end housing is made of resin,
The pressure reducing flow path is formed along the central axis of the impeller.
The vehicle pump device according to claim 3.