JP2009287527A - Washer pump for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washer pump for a vehicle, suppressing liquid scattering from a washer nozzle on a front side when injecting cleaning liquid to a rear side. <P>SOLUTION: With pressure in first and second valve chambers 16, 19 reaching equilibrium (with impeller 6 not rotated), the second seating surface 13e of a diaphragm valve 13 is separated from the seating face 18a of a rear delivery port 18, and also the first seating surface 13d thereof is brought into contact with the seating face 15a of a front delivery port 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle washer pump having a diaphragm valve for selectively supplying a cleaning liquid to a front window and a rear window of a vehicle.

  Conventionally, this type of vehicle washer pump is composed of a pump body and a valve device, as shown in Patent Document 1, for example. The valve device includes first and second valve chambers each having a discharge port, and a diaphragm valve that divides the first valve chamber and the second valve chamber and can be seated on each discharge port by its own elastic deformation. I have. The discharge port of the first valve chamber communicates with the washer nozzle on the front window side, and the discharge port of the second valve chamber communicates with the washer nozzle on the rear window side via piping such as a hose. The diaphragm valve is disposed so as to be separated from each discharge port of the first and second valve chambers, and can be seated on each discharge port by its own elastic deformation. On the other hand, the pump body is provided with an impeller that is rotated by driving a motor and supplies the cleaning liquid in the washer tank to the first and second valve chambers of the valve device, respectively. Depending on the direction, the pressure (water pressure) in one of the first and second valve chambers is larger than the other.

In such a vehicle washer pump, when the impeller rotates counterclockwise, the pressure in the first valve chamber becomes larger than the pressure in the second valve chamber, and the diaphragm valve is elastically deformed toward the second valve chamber. Close the rear discharge port. Then, the cleaning liquid is discharged from the front-side discharge port of the first valve chamber, and is jetted from the front-side washer nozzle through the hose. On the other hand, when the impeller is rotated clockwise, the pressure in the second valve chamber becomes larger than the pressure in the first valve chamber, and the diaphragm valve is elastically deformed toward the first valve chamber to close the front-side discharge port. To do. Then, the cleaning liquid is discharged from the rear side discharge port of the second valve chamber and is sprayed from the rear side washer nozzle through the hose. In this way, the cleaning liquid is selectively supplied to the front window and the rear window.
JP 2003-222262 A

  However, in the vehicle washer pump as described above, although the pressure difference is generated in the first and second valve chambers due to the rotation of the impeller, the cleaning liquid is supplied to each chamber and becomes a positive pressure. Therefore, the initial response of the diaphragm valve Sex is not so good. For this reason, for example, when the cleaning liquid is ejected from the rear washer nozzle, the pressure in the first valve chamber increases and the diaphragm valve is elastically deformed until the front discharge port is closed. There is a possibility that the cleaning liquid may be discharged and the cleaning liquid may unintentionally jump out of the front washer nozzle. In addition, unintended liquid splash on the front side is a problem that should be particularly improved because the interlocking operation of the wiper is not performed and the front visibility is deteriorated.

  The present invention has been made to solve the above-described problems, and has as its object the purpose of the present invention is to provide a vehicular washer capable of suppressing the liquid splash from the front-side washer nozzle when the cleaning liquid is sprayed to the rear side. To provide a pump.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a first valve chamber having a front discharge port communicated with a washer nozzle for supplying a cleaning liquid to a vehicle front window, and a vehicle rear window. A second valve chamber having a rear-side discharge port that communicates with a washer nozzle for supplying cleaning liquid to the first and second valve chambers, and the first valve chamber and the second valve chamber are partitioned into the respective discharge ports by their own elastic deformation. A valve device having a seatable diaphragm valve, and the cleaning liquid is supplied to the first and second valve chambers by rotation of the impeller, and one of the first and second valve chambers depending on the rotation direction of the impeller A pump body that makes the pressure in one chamber larger than the pressure in the other, and the pressure difference in the first and second valve chambers caused by the rotation of the impeller The diaphragm valve is seated on one of the front-side discharge port and the rear-side discharge port and is closed, and the vehicle washer pump discharges the cleaning liquid from the other discharge port. When the pressure in the second valve chamber is equal, the distance between the diaphragm valve and the seat surface of the front discharge port is set to be smaller than the distance between the diaphragm valve and the seat surface of the rear discharge port. It was.

  In this invention, since the diaphragm valve and the seat surface of the front discharge port are close to each other (including the contact state) when the pressures in the first and second valve chambers are equal, the second valve is rotated by the rotation of the impeller. When the pressure in the chamber is made larger than the pressure in the first valve chamber, the diaphragm valve operates to close the front side discharge port with good responsiveness. Therefore, it is possible to suppress liquid splash from the front washer nozzle when the cleaning liquid is ejected from the rear washer nozzle. By the way, the vehicle washer pump and the washer tank are usually installed in the engine room, and the pipe length from the discharge port on the rear side to the washer nozzle is much longer than the pipe length on the front side. Yes. For this reason, even when cleaning fluid leaks into the piping before the diaphragm valve closes the rear-side discharge port during front-side injection, the discharge amount is absorbed in the piping, so the rear side From the washer nozzle, it is difficult to splash liquid.

  According to a second aspect of the present invention, in the vehicle washer pump according to the first aspect, the diaphragm valve contacts the front-side discharge port in a state where the pressures in the first and second valve chambers are equal. ing.

  According to the present invention, the front side washer nozzle is generated by the vibration at the time of acceleration / deceleration of the vehicle because the front side discharge port is closed by the diaphragm valve not only at the time of injection to the rear window but also when the pump is not driven. The liquid leakage from the can be suppressed.

  According to a third aspect of the present invention, in the vehicle washer pump according to the first or second aspect, the diaphragm valve includes a fixed portion fixed to a valve housing constituting the first and second valve chambers, A valve main body portion that can be seated on the seating surface of each discharge port; and a thin flexible portion that connects the fixed portion and the valve main body portion. The valve main body portion is provided in the first and second valve chambers. In a state where the pressure is uniform, the wall thickness is greater on the first valve chamber side than on the second valve chamber side with reference to the center line between the seat surface of the front discharge port and the seat surface of the rear discharge port. It was said.

  In the present invention, the distance between the diaphragm valve and the seat surface of the front discharge port can be changed from the distance between the seat surface of the rear side discharge port by simply changing the shape of the diaphragm valve without changing the shape of the valve housing. Therefore, the conventional valve housing can be used as it is.

  According to a fourth aspect of the present invention, in the vehicular washer pump according to the first or second aspect, the front-side discharge port and the rear-side discharge port respectively protrude into the respective chambers and the seat at the front end portion. An inner discharge cylinder portion having a surface is formed, and the axial length of the inner discharge cylinder portion of the front side discharge port is set longer than the axial length of the inner discharge cylinder portion of the rear side discharge port.

  In the present invention, by changing the shape of the first and second valve chambers (valve housings), the distance between the diaphragm valve and the seat surface of the front discharge port is made smaller than the distance between the seat surface of the rear discharge port. Therefore, the diaphragm valve can be configured without an assembling direction, which can contribute to prevention of the incorrect assembly of the diaphragm valve. In addition, the conventional diaphragm valve can be used as it is.

  According to a fifth aspect of the present invention, in the vehicle washer pump according to any one of the first to fourth aspects, the valve housing constituting the first and second valve chambers includes the front discharge port and Identification means for identifying at least one of the rear side discharge ports is provided.

  In the present invention, the front discharge port and the rear discharge port can be identified at a glance from the outside by the identification means provided in the valve housing, which can contribute to prevention of erroneous assembly.

  Therefore, according to the above-described invention, it is possible to suppress liquid splash from the front washer nozzle when the cleaning liquid is jetted to the rear side.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the vehicle washer pump 1 of this embodiment includes a pump body 2 and a valve device 3.

  The pump body 2 includes a motor 4, a housing 5, an impeller 6, a pump chamber cover 7, and the like. The motor 4 can rotate the rotating shaft 8 forward and backward according to a power supply voltage supplied from the outside. The housing 5 is formed in a substantially bottomed cylindrical shape, and includes a motor accommodating portion 5a that substantially accommodates the motor 4, and a pair of flow paths 5b and 5c (see FIG. 2) that extend in parallel along the motor accommodating portion 5a. Is formed. A through hole 5d penetrating to the outside is formed in the bottom portion (left end portion in FIG. 1) of the motor housing portion 5a. The motor 4 is housed in the motor housing 5a so that the tip of the rotating shaft 8 is sealed and penetrates the through hole 5d and protrudes to the outside. An impeller 6 (see FIG. 2) is fixed to the tip of the rotating shaft 8.

  One end portions of the flow paths 5b and 5c (the end portion on the front end side of the rotating shaft 8 and the left end portion in FIG. 1) are opened to the outside as they are. The other end portions (the right end portion in FIG. 1) of the flow paths 5b and 5c are bent outward (in the radial direction of the housing 5) and protruded from the housing 5 into a cylindrical shape. (See FIG. 2). As shown in FIG. 2, the two main body discharge cylinder portions 5e and 5f are juxtaposed with a predetermined interval and project in parallel.

  A pump chamber cover 7 is fixed to one end portion of the housing 5 (the end portion on the front end side of the rotating shaft 8 and the left end portion in FIG. 1). As shown in FIGS. 1 and 2, the pump chamber cover 7 has an impeller receiving recess 7a that is recessed corresponding to the impeller 6 so as not to prevent the impeller 6 from rotating, and a predetermined number of the impeller receiving recess 7a. First and second communicating recesses 7b and 7c are formed so as to be connected to one end portions of the flow paths 5b and 5c from the angular position. As shown in FIG. 2, the first communication recess 7b is formed in one rotational direction (counterclockwise direction) of the impeller 6 and in the tangential direction of the outer periphery of the impeller 6. The second communication recess 7c is also formed in the impeller. 6 is formed in the other rotation direction (clockwise direction) 6 and in the tangential direction of the outer periphery of the impeller 6. Further, as shown in FIG. 1, an intake hole 7d penetrating to the outside is formed in the center of the bottom of the impeller accommodating recess 7a of the pump chamber cover 7. In the present embodiment, the pump chamber 10 is formed by the impeller accommodating recess 7 a and one end surface of the housing 5.

The valve device 3 includes first and second divided housings 11 and 12 constituting a valve housing, and a diaphragm valve 13.
The first divided housing 11 is for forming a first valve chamber 16 having an inlet 14 and a discharge port 15, and the second divided housing 12 is a second valve having an inlet 17 and a discharge port 18. This is for forming the chamber 19. In the present embodiment, the discharge port 15 of the first valve chamber 16 is the front discharge port 15, and the hose H1 is connected to the front washer nozzle FN for supplying the washer liquid (cleaning liquid) to the front window (not shown) of the vehicle. It is communicated through. The discharge port 18 of the second divided housing 12 is a rear-side discharge port 18 and communicates with a rear washer nozzle RN for supplying washer fluid to a rear window (not shown) via a hose H2. The vehicle washer pump 1 is disposed in a vehicle engine room (not shown) located in front of the front window together with a washer tank (not shown) communicating with the intake hole 7d of the pump body 2. Therefore, the length of the hose H1 on the front side is extremely shorter than the length of the hose H2 on the rear side.

  The diaphragm valve 13 is sandwiched between the first divided housing 11 and the second divided housing 12, and partitions the first valve chamber 16 and the second valve chamber 19. The diaphragm valve 13 is for opening one of the discharge ports 15 and 18 and closing the other by a pressure difference between the first valve chamber 16 and the second valve chamber 19. The first and second divided housings 11 and 12 are formed in the same shape, that is, the same component, while being able to be fitted and fixed to each other. Accordingly, the structure will be described below by taking the first divided housing 11 as an example, and the second divided housing 12 will be denoted by the same reference numerals and detailed description thereof will be omitted.

  As shown in FIGS. 4 and 5, the first divided housing 11 includes a main body portion 21, an outer extension portion 22, an inflow cylinder portion 23, an inner discharge cylinder portion 24, and an outer discharge cylinder portion 25. The main body portion 21 is formed in a substantially bottomed cylindrical shape. The outer extension 22 extends radially outward from the opening of the main body 21. The inflow cylinder part 23 is formed so as to protrude in a cylindrical shape from a part of the outer periphery (circumferential surface) of the main body part 21 in a direction orthogonal to the central axis S1 of the main body part 21 (upward in FIGS. 4B and 5). The outer side and the inner side of the main body 21 are communicated with each other. And the inflow cylinder part 23 is formed so that the inner periphery corresponds with the outer periphery of the said main body discharge cylinder part 5e so that the main body discharge cylinder part 5e of the pump main body 2 can be fitted. Further, the position of the inflow cylinder part 23 (inlet 14) is set so that the end part (outlet) on the main body part 21 side faces the outer peripheral surface of the inner discharge cylinder part 24.

  The inner discharge cylinder 24 protrudes in a cylindrical shape from the center of the bottom of the main body 21 toward the inner side in the direction of the central axis S1 of the main body 21 (the opening direction of the main body 21). Protrusively formed. The outer discharge cylinder part 25 protrudes in a cylindrical shape from the center of the bottom part of the main body part 21 toward the outer side in the direction of the central axis S1 of the main body part 21 (the reverse direction of the inner discharge cylinder part 24). It is formed to protrude in a shape. The inner and outer discharge cylinder portions 24 and 25 are communicated on the same straight line (the central axis S1), and are formed to communicate the inner side and the outer side of the main body portion 21. In the present embodiment, the inner and outer discharge cylinder portions 24 and 25 constitute the front-side discharge port 15.

  A valve seat portion 24 a having an inner edge extending in the direction of the central axis S <b> 1 of the main body portion 21 is formed at the distal end portion (opening side end portion of the main body portion 21) of the inner discharge cylinder portion 24. The valve seat portion 24a has a semicircular cross section along its central axis S1. The front end surface of the valve seat portion 24a is a seat surface 15a of the front discharge port 15, and the diaphragm valve 13 is seated on the seat surface 15a, so that the front discharge port 15 (inner discharge cylinder portion 24) is seated. ) Is blocked. In the assembled state of the first and second divided housings 11 and 12, the seat surfaces (the seat surface 15a of the front-side discharge port 15 and the seat surface 18a of the rear-side discharge port 18) of each inner discharge cylinder portion 24 are mutually connected. They are parallel and perpendicular to the central axis S1 (see FIG. 3B). An engagement protrusion 25a for connecting the hose H1 is formed at the tip of the outer discharge cylinder portion 25 that forms the front discharge port 15 with the inner discharge cylinder portion 24.

  A fitting part 26 is formed in the outer extension part 22. The fitting part 26 is formed in a substantially annular shape along the outer edge of the outer extension part 22. Specifically, the fitting part 26 includes a substantially arc-shaped outer arc part 26 a and an inner arc part 26 b erected along the outer edge of the outer extension part 22. As shown in FIG. 4B, the outer arc portion 26 a and the inner arc portion 26 b are straight lines that equally divide the fitting portion 26 when viewed from the axial direction of the main body portion 21. They are formed at symmetrical positions with respect to a straight line L1 passing through the axis S1 and the axial center of the inflow cylinder portion 23 (so that one is the outer arc portion 26a and the other is the inner arc portion 26b). In the outer arc portion 26a, two connecting slits 26c penetrating inward and outward in the radial direction are formed in the circumferential direction. The outer peripheral surface (outer surface) of the inner arc portion 26b is a distance from the inner peripheral surface (inner surface) of the outer arc portion 26a and the central axis S1 of the main body portion 21, as shown in FIG. (Radius) is set to be equal. A connecting claw 26d that fits into the connecting slit 26c when the outer peripheral surface is combined with the inner peripheral surface of the outer arc portion 26a is formed on the outer peripheral surface of the inner arc portion 26b.

  Further, the fitting portion 26 includes anti-rotation recesses 26e and 26f and anti-rotation projections 26g and 26h. As shown in FIG. 4B, the rotation stopper recesses 26e and 26f and the rotation prevention protrusions 26g and 26h are formed with respect to the straight line L1 (on one side, the rotation prevention recesses 26e, 26f, and the anti-rotation projections 26g and 26h on the other side) are formed at symmetrical positions.

  One anti-rotation concave part 26e and anti-rotation convex part 26g are formed adjacent to each other on the opposite side (point symmetrical position) of the inflow cylinder part 23 in the circumferential direction of the fitting part 26. The anti-rotation convex portion 26g is formed so as to continue from the opposite side of the inflow cylindrical portion 23 in the inner circular arc portion 26b and extend radially outward. The anti-rotation recess 26e is a gap formed by the end of the outer arc portion 26a opposite to the inflow cylinder 23 and the anti-rotation projection 26g.

  The other anti-rotation recess 26f and the anti-rotation projection 26h are formed apart from each other on the inflow cylinder 23 side. The anti-rotation convex portion 26h is formed so as to continue from the inflow cylindrical portion 23 side of the inner circular arc portion 26b and extend radially outward. The anti-rotation recess 26f is a gap formed by the end of the outer arc portion 26a on the inflow cylinder portion 23 side and the intermediate arc portion 26i. Further, the intermediate arc portion 26i is formed from the rotation preventing convex portion 26h in the circumferential direction to the symmetric position with respect to the straight line L1.

  Further, as shown in FIG. 4 (b), a pinching portion 27, which is an annular plane when viewed from the axial direction of the main body portion 21, is formed inside the fitting portion 26 in the outer extension portion 22. Yes. Further, as shown in FIGS. 4B and 5, an annular holding projection 28 is erected on the inner side of the pinching portion 27 in the outer extension portion 22 and on the inner edge of the outer extension portion 22. Yes.

  In the first and second divided housings 11 and 12 as described above, the inner circumferential surface of the outer arc portion 26a is aligned with the outer circumferential surface of the inner arc portion 26b, the coupling claw 26d is fitted in the coupling slit 26c, and the anti-rotation recess When the rotation preventing projections 26g and 26h are fitted to the 26e and 26f, they can be fitted and fixed to each other. The diaphragm valve 13 is interposed between the first and second divided housings 11 and 12 as shown in FIG. 3A and 3B show a state where the pump body 2 is not driven and the pressures in the first and second valve chambers 16 and 19 are equal to each other (equilibrium state).

  The diaphragm valve 13 is made of an elastic material such as a rubber material, and is formed in a substantially disk shape. An annular fixing portion 13 a is formed on the outer peripheral edge portion of the diaphragm valve 13. The diaphragm valve 13 is fixed to the valve housing by the fixing portion 13a being held between the holding portions 27 of the first and second divided housings 11 and 12. In addition, the fixed portion 13a is held by the holding projections 28 of the first and second divided housings 11 and 12 so that the inward movement is restricted. An annular flexible portion 13b that is continuous with the fixed portion 13a is formed on the inner side (radially inside) of the fixed portion 13a, and a substantially cylindrical shape that is continuous with the flexible portion 13b is formed at the center of the diaphragm valve 13. A valve body 13c is formed. The flexible portion 13b is formed thinner than the fixed portion 13a and the valve main body portion 13c, and a part thereof is formed in a wave shape. The valve main body portion 13c can be displaced in the direction of the central axis S1 by the bending of the flexible portion 13b. It has become. The valve main body 13c is seated on the seating surface 15a of the front-side discharge port 15 or the seating surface 18a of the rear-side discharge port 18, so that the discharge ports 15 and 18 can be closed.

  First and second seating surfaces 13d and 13e that are parallel to each other are formed on both end surfaces of the valve body 13c in the direction of the central axis S1. The end surface on the front discharge port 15 side is the first seating surface 13d, the end surface on the rear discharge port 18 side is the second seating surface 13e, and the first and second seating surfaces 13d and 13e are the central axis S1. Is orthogonal. The first seating surface 13d is formed with a conical convex valve body identification portion 13f. By this valve body identification portion 13f, which of the flat surfaces of the diaphragm valve 13 is on the first divided housing 11 side or the second divided housing side. It can be visually discriminated whether it is the 12 side. This contributes to prevention of erroneous assembly that causes the diaphragm valve 13 to be assembled with the first seating surface 13d as the rear discharge port 18 side.

  In the equilibrium state, the valve main body 13c is first than the second valve chamber 19 side with respect to the center line C between the seating surface 15a of the front discharge port 15 and the seating surface 18a of the rear discharge port 18. It is thick on the valve chamber 16 side. Specifically, as shown in FIG. 3B, the first seating from the center line C is more than the wall thickness T2 from the center line C to the second seating surface 13e in the direction of the center axis S1 between the seating surfaces 15a and 18a. The wall thickness T1 up to the surface 13d is set larger.

  The first seating surface 13d of the valve main body 13c contacts the seating surface 15a of the front discharge port 15 (inner discharge cylinder portion 24) in a balanced state, and closes the front discharge port 15. On the other hand, the second seating surface 13e of the valve body 13c is separated from the seating surface 18a of the rear-side discharge port 18. That is, in the balanced state of the first and second valve chambers 16 and 19, the distance between the diaphragm valve 13 and the seating surface 15a of the front discharge port 15 is smaller than the distance between the seating surface 18a of the rear discharge port 18. Is set. The distance between the second seating surface 13e and the seating surface 18a of the rear side discharge port 18 is such that the washer fluid can be preferably poured from the second valve chamber 19 into the rear side discharge port 18 when the pump body 2 is driven. It is set to a possible distance. Further, since the first seating surface 13d is in contact with the seating surface 15a of the front-side discharge port 15 in the equilibrium state, the first valve is caused by vibrations during acceleration / deceleration of the vehicle when the vehicle washer pump 1 is not used. The washer liquid in the chamber 16 is prevented from flowing out from the front discharge port 15 to the hose H1 and leaking out from the front washer nozzle FN.

  The first and second divided housings 11 and 12 are assembled by fitting and fixing a fitting portion 26 so that the diaphragm valve 13 is interposed therebetween. At this time, the fixed portion 13a of the diaphragm valve 13 is held by the holding portion 27. The first valve chamber 16 and the second valve chamber 19 are formed inside the main body portions 21 of the first and second divided housings 11 and 12 by being partitioned by the diaphragm valve 13. The valve device 3 assembled in this way is fixed to the pump main body 2 by fitting the inflow cylinder portions 23 to the main body discharge cylinder portions 5e and 5f. In addition, between the main body discharge cylinder parts 5e and 5f and each inflow cylinder part 23 is sealed with a seal ring (not shown). As shown in FIG. 2, an identification mark M as identification means for identifying the front discharge port 15 is attached to the outer peripheral surface of the outer discharge cylinder portion 25 constituting the front discharge port 15. Yes. This identification mark M makes it possible to distinguish between the front-side discharge port 15 and the rear-side discharge port 18 at first glance from the outside, which can contribute to prevention of erroneous assembly that reverses the front side and the rear side.

Next, the operation of the vehicle washer pump 1 configured as described above will be described.
First, when injecting the washer liquid from the rear washer nozzle RN, the motor 4 of the pump body 2 is driven to rotate the impeller 6 in the forward direction (in the present embodiment, it rotates clockwise in FIG. 2). Then, the washer liquid is sucked from the washer tank through the intake hole 7d, and the washer liquid is supplied to the second communication recess 7c (on the main body discharge cylinder portion 5f side) with a large positive pressure. At this time, the washer fluid is also supplied to the first communication recess 7b side (main body discharge cylinder portion 5e side) with a positive pressure smaller than the pressure supplied to the second communication recess 7c. Thereby, the pressure in the 2nd valve chamber 19 connected with the 2nd communication recessed part 7c becomes a big positive pressure, and the pressure in the 1st valve chamber 16 connected with the 1st communication recessed part 7b becomes a small positive pressure.

  Then, as shown in FIG. 6 (a), the diaphragm valve 13 has its flexible portion 13b and the valve main body portion 13c on the first valve chamber 16 side due to the differential pressure between the first and second valve chambers 16 and 19. The valve main body portion 13 c is pressed against the seating surface 15 a of the front discharge port 15 by being biased. Thereby, the closed state of the front-side discharge port 15 by the valve body 13c is stronger than when the pressures in the first and second valve chambers 16 and 19 are balanced (when the pump body 2 is not driven). Become. 6A, the washer liquid supplied to the second valve chamber 19 is discharged from the rear discharge port 18 and is injected from the rear washer nozzle RN through the hose H2.

  In the present embodiment, as described above, the front-side discharge port 15 is already closed in the balanced state of the first and second valve chambers 16 and 19 (the pump main body 2 is not driven), and the valve body from the balanced state. Until the portion 13c is urged toward the first valve chamber 16, the washer liquid in the first valve chamber 16 hardly flows out from the front discharge port 15. In other words, unintentional ejection of the washer liquid from the front washer nozzle FN during injection from the rear washer nozzle RN is suppressed.

  On the other hand, when the washer liquid is ejected from the front washer nozzle FN, the impeller 6 of the pump body 2 is rotated in the opposite direction to that described above, and the pressure in the first valve chamber 16 is increased in the second valve chamber 19. Greater than pressure. Then, as shown in FIG. 6B, the flexible portion 13b and the valve main body portion 13c of the diaphragm valve 13 are urged toward the second valve chamber 19 by the differential pressure between the first and second valve chambers 16 and 19. Then, the valve body 13c is displaced toward the second valve chamber 19 side. Then, the front discharge port 15 closed by the valve body 13c is opened, and the valve body 13c is seated (pressed contact) on the seat surface 18a of the rear discharge port 18 so that the rear discharge The outlet 18 is blocked. In the closed state of the rear-side discharge port 18, the washer liquid supplied to the first valve chamber 16 is discharged from the front-side discharge port 15 as shown by the arrow in FIG. 6B, and the front washer is supplied through the hose H1. Injected from nozzle FN.

  Incidentally, as described above, the length of the hose H2 on the rear side is extremely longer than the length of the hose H1 on the front side. Therefore, even if the washer fluid leaks from the rear side discharge port 18 to the hose H2 before the diaphragm valve 13 closes the rear side discharge port 18 during the injection from the front washer nozzle FN, the discharge amount is Since it is absorbed in the hose H2, almost no liquid splashes from the rear washer nozzle RN.

  In the present embodiment, the valve body 13c of the diaphragm valve 13 is not pressed against the seat surface 15a of the front discharge port 15 in the balanced state of the first and second valve chambers 16 and 19. Therefore, compared with a configuration in which the valve body is always urged toward the front discharge port 15 by a biasing member such as a spring, the ejection operation from the front washer nozzle FN (opening operation of the front discharge port 15 of the diaphragm valve 13). , And the closing operation of the rear-side discharge port 18). That is, the delay in closing the rear side discharge port 18 of the diaphragm valve 13 due to the urging of the urging member is prevented from being promoted to prevent the occurrence of liquid splash from the rear washer nozzle RN. It is also possible to ensure the responsiveness of the washer liquid injection from the front washer nozzle FN, which is performed more frequently than the number of times.

  As described above, in the vehicle washer pump 1 of the present embodiment, the front winder and the rear of the vehicle are suppressed while suppressing unintended liquid jumping from the side of the front washer nozzle FN and the rear washer nozzle RN that are not injecting operation. Washer liquid can be supplied to the window as an alternative.

Next, characteristic effects of the present embodiment will be described.
(1) In the present embodiment, in the balanced state of pressure in the first and second valve chambers 16 and 19 (the impeller 6 is not rotating), the diaphragm valve 13 has a second seating surface 13e whose rear discharge port Since the first seating surface 13d is in contact with the seating surface 15a of the front discharge port 15, the valve body 13c is attached to the first valve chamber 16 side from the balanced state. The washer fluid in the first valve chamber 16 is suppressed from flowing out from the front discharge port 15 until it is energized. Therefore, liquid splash from the front washer nozzle FN when the washer liquid is ejected from the rear washer nozzle RN can be suppressed.

  Furthermore, since the front-side discharge port 15 is closed by the diaphragm valve 13 even when the pump body 2 is not driven, it is possible to suppress liquid leakage from the front washer nozzle FN caused by vibrations during acceleration / deceleration of the vehicle.

  (2) In the present embodiment, the valve body 13c of the diaphragm valve 13 has a center line C between the seat surface 15a of the front discharge port 15 and the seat surface 18a of the rear discharge port 18 in the balanced state. As a reference, the first valve chamber 16 side is thicker than the second valve chamber 19 side. Thus, the seating surfaces of the diaphragm valve 13 and the front discharge port 15 can be changed by changing the shape of the diaphragm valve 13 without changing the shapes of the first and second divided housings 11 and 12 constituting the valve housing. Since the distance to 15a can be made smaller than the distance to the seating surface 18a of the rear side discharge port 18, the conventional valve housing can be used as it is.

  (3) In the present embodiment, the front-side discharge port 15 and the rear side at a glance from the outside by the identification mark M as the identification means attached to the outer peripheral surface of the outer discharge cylinder portion 25 constituting the front-side discharge port 15. Since the discharge port 18 can be identified, it can contribute to prevention of erroneous assembly that reverses the front side and the rear side.

  (4) In this embodiment, the valve body identification part 13f is provided in the 1st seating surface 13d of the valve main-body part 13c, and which of the flat surfaces of the diaphragm valve 13 is the 1st divided housing 11 side by this valve body identification part 13f. Or the second divided housing 12 side can be visually discriminated. Thereby, it can contribute to prevention of the incorrect assembly | attachment which attaches the diaphragm valve 13 by making the 1st seating surface 13d into the rear side discharge outlet 18 side.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the distance between the first seating surface 13d of the diaphragm valve 13 and the seating surface 15a of the front discharge port 15 (in this embodiment, the distance is zero because it is in contact) is the second seating surface 13e. Although the configuration that the distance is smaller than the distance between the rear discharge port 18 and the seating surface 18a is realized by changing the shape (thickness) of the diaphragm valve 13, the valve housing (first and second divided housings 11 and 12). It may be realized by changing the shape of the side. For example, in the example shown in FIG. 7, the length X1 of the inner discharge cylinder portion 30 of the front discharge port 15 in the direction of the central axis S1 is the length of the rear discharge port 18 of the inner discharge cylinder portion 24 in the direction of the central axis S1. It is set longer than X2. The length X1 is a length from the bottom inner surface of the main body 21 of the first divided housing 11 to the seating surface 15a of the front discharge port 15 (inner discharge cylinder portion 30), and the length X2 is This is the length from the bottom inner surface of the main body portion 21 of the second divided housing 12 to the seating surface 18a of the rear side discharge port 18 (inner discharge cylinder portion 24). Further, the valve body 13c of the diaphragm valve 31 has the same thickness on the first valve chamber 16 side and the second valve chamber 19 side. That is, the first valve chamber 16 side and the second valve chamber 19 side have no assembly direction. According to such a configuration, the distance between the diaphragm valve 31 and the seat surface 15a of the front discharge port 15 is made smaller than the distance between the seat surface 18a of the rear discharge port 18 by changing the shape on the valve housing side. Therefore, the diaphragm valve 31 can be configured without an assembling direction, and this can contribute to prevention of erroneous assembly in which the front side and the rear side of the diaphragm valve 31 are assembled reversely. In addition, the conventional diaphragm valve 31 can be used as it is.

  In addition, by changing the shape of both the diaphragm valve 13 and the valve housing, the distance between the diaphragm valve 31 and the seat surface 15a of the front discharge port 15 is made smaller than the distance between the seat surface 18a of the rear discharge port 18. Also good.

  In the above embodiment, the first seating surface 13 d of the diaphragm valve 13 is in contact with the seating surface 15 a of the front discharge port 15 in the balanced state of the first and second valve chambers 16 and 19. However, the first seating surface 13 d may be separated from the seating surface 15 a of the front discharge port 15 within a range smaller than the distance between the second seating surface 13 e and the seating surface 18 a of the rear discharge port 18. Even with such a configuration, the responsiveness of the closing operation of the diaphragm valve 13 with respect to the front discharge port 15 can be improved, so that the liquid from the front washer nozzle FN when the washer liquid is injected from the rear washer nozzle RN. Flying can be suppressed.

  In the above embodiment, the identification mark M as identification means for identifying the front discharge port 15 is attached to the outer peripheral surface of the outer discharge cylinder portion 25 constituting the front discharge port 15. For example, you may attach | subject to the main-body part 21 and the inflow cylinder part 23 of the 1st division | segmentation housing 11. FIG. Further, instead of (or in addition to) the identification mark M for identifying the front side discharge port, an identification mark for identifying the rear side discharge port may be added. In addition to attaching the identification mark M as the identification means, for example, an identification unit having a feature in the shape may be provided, or other configurations that can be identified may be employed.

  -In above-mentioned embodiment, although the valve body identification part 13f was formed in the cone shape on the 1st seating surface 13d, you may make a hemispherical convex shape etc. in addition to that. In addition to the first seating surface 13d, the place to be provided may be, for example, the second seating surface 13e or the flexible portion 13b.

  The diaphragm valve 13 of the above embodiment is divided into the first valve chamber 16 and the second valve chamber 19 and can be seated on the front side and rear side discharge ports 15 and 18 by its own elastic deformation. You may change into the structure of. Even if it does in this way, the effect similar to the said embodiment can be acquired.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In the vehicle washer pump according to any one of claims 1 to 5,
The vehicle washer pump according to claim 1, wherein the diaphragm valve is provided with a valve discriminating portion for identifying one of the first valve chamber side and the second valve chamber side of the diaphragm valve.

  According to this configuration, the first valve chamber side and the second valve chamber side of the diaphragm valve can be visually discriminated by the valve discriminating portion, so that the diaphragm valve is provided with the first seating surface 13d as the rear discharge port 18 side. This can contribute to the prevention of erroneous assembly of 13.

The side sectional view of the washer pump for vehicles of this embodiment. The schematic block diagram of the washer pump for vehicles. (A) Sectional drawing which expands and shows a valve apparatus part, (b) Sectional drawing which expands and shows a diaphragm valve part. (A) Top view of the 1st and 2nd division | segmentation housing, (b) Side view. Sectional drawing of the 1st and 2nd division | segmentation housing. (A) Sectional drawing for demonstrating the injection operation | movement from a rear washer nozzle, (b) Sectional drawing for demonstrating the injection operation | movement from a front washer nozzle. Sectional drawing which shows the valve apparatus of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle washer pump, 2 ... Pump main body, 3 ... Valve apparatus, 6 ... Impeller, 13, 31 ... Diaphragm valve, 15 ... Front side discharge port, 15a ... Seat surface of front side discharge port, 16 ... 1st valve 18, rear side discharge port, 18 a, seat surface of the rear side discharge port, 19, second valve chamber, C, center line, M, identification mark as identification means, S 1, main body of the divided housing (discharge port ), The central axis of the first valve chamber, T2 the thickness of the second valve chamber, FN, the front washer nozzle, and RN, the rear washer nozzle.

Claims (5)

A first valve chamber having a front side discharge port connected to a washer nozzle for supplying a cleaning liquid to a vehicle front window, and a rear side discharge port connected to a washer nozzle for supplying a cleaning solution to the rear window of the vehicle And a valve device having a diaphragm valve that partitions the first valve chamber and the second valve chamber and can be seated on each discharge port by elastic deformation of itself.
The cleaning liquid is supplied to the first and second valve chambers by the rotation of the impeller, and the pressure in one of the first and second valve chambers is set to be higher than that of the other in accordance with the rotation direction of the impeller. The pump body to enlarge,
The diaphragm valve is seated and closed at one of the front-side discharge port and the rear-side discharge port due to a pressure difference between the first and second valve chambers generated by the rotation of the impeller, and the other A vehicle washer pump for discharging the cleaning liquid from a discharge port of
In a state where the pressures in the first and second valve chambers are equal, the distance between the diaphragm valve and the seat surface of the front discharge port is greater than the distance between the diaphragm valve and the seat surface of the rear discharge port. A washer pump for vehicles characterized by being set small. In the vehicle washer pump according to claim 1,
The vehicle washer pump, wherein the diaphragm valve is in contact with the front-side discharge port in a state where the pressures in the first and second valve chambers are equal. In the vehicle washer pump according to claim 1 or 2,
The diaphragm valve includes a fixed portion fixed to a valve housing constituting the first and second valve chambers, a valve main body that can be seated on a seating surface of each discharge port, the fixed portion, and the valve main body. And a thin flexible part that connects
The valve main body portion is configured so that the first and second valve chambers have equal pressures with respect to a center line between a seat surface of the front discharge port and a seat surface of the rear discharge port. A vehicular washer pump characterized in that it is thicker on the first valve chamber side than on the two-valve chamber side. In the vehicle washer pump according to claim 1 or 2,
Each of the front-side discharge port and the rear-side discharge port is formed with an inner discharge cylinder portion that protrudes into the respective chambers and has the seat surface at a tip portion thereof,
A vehicular washer pump, wherein an axial length of an inner discharge cylinder portion of the front discharge port is set to be longer than an axial length of an inner discharge cylinder portion of the rear discharge port. In the vehicle washer pump according to any one of claims 1 to 4,
A vehicle washer pump, characterized in that an identification means for identifying at least one of the front-side discharge port and the rear-side discharge port is provided in a valve housing constituting the first and second valve chambers. .

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