JP2010064503A - Washer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washer device capable of preventing water from intruding into a motor part even when a breathing pipe is temporarily sunk in water. <P>SOLUTION: A grommet body 52 is inserted into a mounting hole 14 formed on the wall part 12A of a tank 12. The housing 22 of a pump device 20 is inserted into the inner peripheral surface of the grommet body 52. In this state, an attachment part 54 integrally provided on the grommet body 52 is liquid-tightly attached to a breathing pipe 38 communicated in the motor part. Further, a fine porous film 74 provided in the communication hole 72 of the attachment part 54 shuts off the intrusion of the liquid into the breathing pipe 38 allowing a gas to pass therethrough. Thereby, an atmospheric pressure difference of the motor part and outside air is eliminated without increasing the number of assembling parts, and water can be prevented from intruding into the motor part even when the breathing pipe 38 is temporarily sunk in water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a washer device in which a pump device is attached to a tank by a grommet.

  Patent Document 1 describes a rubber grommet used when a pump device is attached to a tank. The grommet is provided with a vent hole communicating with a breathing hole of a motor unit provided in the pump device in a state where the pump device is fixed to the tank by the grommet.

By forming this vent like a maze, water can be prevented from entering the motor part from the outside, and the motor part can be opened to the atmosphere via the breathing hole and the vent hole. Yes.
JP 11-117900 A

  However, the vent hole of the grommet that communicates with the breathing hole (breathing pipe) of the motor unit merely has a maze structure. For this reason, when the vent hole is submerged although it has a structure that suppresses the ingress of water, it is considered that water is sucked into the motor unit due to a difference in atmospheric pressure between the motor unit and the atmosphere.

  An object of the present invention is to prevent water from entering the motor portion even when the breathing pipe is temporarily submerged in consideration of the above fact.

  A washer device according to claim 1 of the present invention is inserted into a pump device including a motor unit and a pump unit driven by the motor unit, and a mounting hole formed in a wall of a tank in which liquid is stored, A cylindrical grommet body that holds the pump device in the mounting hole by inserting a part of the pump device into an inner peripheral surface, and a part of the pump device that is integrally provided in the grommet body. Is inserted in the grommet body, provided in a mounting portion where a breathing pipe communicating with the inside of the motor portion provided in the pump device is liquid-tightly mounted, and a communication hole formed in the mounting portion, A waterproof sheet that blocks the ingress of liquid into the breathing pipe and allows gas to pass therethrough while the breathing pipe is liquid-tightly mounted on the mounting portion. To.

  According to the above configuration, the cylindrical grommet main body is inserted into the mounting hole formed in the tank wall, and a part of the pump device is inserted into the inner peripheral surface of the grommet main body, or the pump is inserted into the inner peripheral surface of the grommet main body. The pump device is held in the mounting hole by inserting a part of the device and inserting the grommet body together with the pump device into the mounting hole of the tank.

  In this state, the mounting portion provided integrally with the grommet main body is liquid-tightly mounted on a breathing pipe communicating with a motor portion provided in the pump device. And the waterproof sheet provided in the communicating hole of the mounting part blocks the infiltration of the liquid into the breathing pipe and allows the gas to pass therethrough.

  In this way, by providing the mounting part with a waterproof sheet integrally with the grommet body, the pressure difference between the motor part and the outside air is eliminated without increasing the number of parts to be assembled, and the breathing pipe is temporarily submerged. Even in this case, water can be prevented from entering the motor portion.

  The washer device according to claim 2 of the present invention is the configuration according to claim 1, wherein the breathing pipe is attached to the attachment hole formed in the wall portion of the tank by the grommet body. The pump device extends downward in the gravitational direction. The pump device surrounds at least a part of the mounting portion in a state where the mounting portion is liquid-tightly attached to the breathing pipe, and extends downward in the gravitational direction. An extending drip wall is provided.

  According to the said structure, the water droplet adhering to the outer surface of a pump apparatus because a pump apparatus is submerged temporarily flows along a pump outer surface, and the gravity direction downward. However, the water droplets flowing downward in the gravity direction along the outer surface fall from the outer surface of the pump device by the drop wall formed to extend downward in the gravity direction. For this reason, it is suppressed that a water drop is transmitted to a mounting part, and it can prevent that a water drop penetrate | invades from the joint part of a mounting part and a pump apparatus.

  The washer device according to claim 3 of the present invention is characterized in that, in the configuration according to claim 1 or 2, the waterproof sheet is a resin-made porous film.

  According to the said structure, a waterproof sheet is a resin-made porous film. Thus, by using a general-purpose product as the waterproof sheet, it is possible to prevent liquid from entering the motor unit even when the breathing pipe is temporarily submerged.

  The washer device according to claim 4 of the present invention is the configuration according to any one of claims 1 to 3, wherein the grommet body and the mounting portion are integrally formed of an elastic material, A breathing pipe housing portion is provided for housing the breathing pipe, and the length of the breathing pipe is longer than the length of the breathing pipe housing portion, and the opening of the breathing pipe is a peripheral wall surface of the communication hole. It is characterized by hitting.

  According to the said structure, the length of the breathing pipe is set longer than the length of the breathing pipe accommodating part of a mounting part, and also the open port of the breathing pipe is applied to the hole surrounding wall surface of a communicating hole.

  For this reason, the hole peripheral wall surface of the communication hole can be easily brought into close contact with the opening of the breathing pipe by the elasticity of the mounting portion.

  An example of the washer device according to the first embodiment of the present invention will be described with reference to FIGS.

(overall structure)
As shown in FIGS. 1 and 5, the washer device 10 includes a tank 12 for storing a washer liquid (cleaning liquid) W, a grommet 16 attached to the mounting hole 14 of the tank 12, and the grommet 16 interposed therebetween. The main component is a pump device 20 that is liquid-tightly attached to the attachment hole 14. The mounting hole 14 has a circular shape and is formed in the wall portion 12 </ b> A near the bottom of the tank 12.

  The pump device 20 pressure-feeds the washer liquid W in the tank 12 to a washer nozzle (not shown). The pump device 20 has a substantially cylindrical housing 22 and a connector portion 24 disposed on one end side of the housing 22. It has.

  Further, a suction port 26 is provided on the other end side (left side in FIG. 1) of the housing 22, and a discharge port 28 is provided on the same end side (right side in FIG. 1) as the connector portion 24. The pump device 20 is inserted into the mounting hole 14 from the suction port 26 side along the axial direction (G direction shown in FIG. 1) of the housing 22, and is mounted so that a part of the housing 22 is disposed in the tank 12. It is attached to the hole 14.

  In addition, an electric motor is accommodated in a motor section (not shown) in the housing 22, and the electric motor is configured to operate when power is supplied from the connector section 24. When the electric motor is operated, an impeller (not shown) fixed to the rotating shaft of the electric motor is rotated, and the washer fluid W is sucked from the suction port 26 into a pump unit (not shown) that is liquid-tightly partitioned from the motor chamber. The sucked washer liquid W is sent out from the discharge port 28 in a pressurized state. The washer liquid W to be sent out is pressure-fed to the washer nozzle via a hose (not shown) connected to the discharge port 28.

  Further, the pump device 20 is provided with a breathing pipe 38 that communicates the inside of the motor unit with the outside (atmosphere). As a result, even if there is a change in the heat generation or ambient temperature of the electric motor itself, the internal pressure of the motor section becomes the same as the atmospheric pressure (there is no relative atmospheric pressure difference inside and outside), and water and dust are sucked into the motor section. To prevent this. Details of the breathing pipe 38 will be described later.

  The housing 22 is formed with a substantially cylindrical grommet mounting portion 30 for mounting the grommet 16 at an intermediate portion in the axial direction. A flange-shaped first restricting portion 32 having a diameter larger than that of the grommet mounting portion 30 is formed on the suction port 26 side of the grommet mounting portion 30, and the grommet mounting portion 30 is similarly formed on the discharge port 28 side. A flange-shaped second restricting portion 34 having a larger diameter than that is formed.

  The grommet mounting portion 30 is located slightly closer to the first restricting portion 32 than the intermediate point between the first restricting portion 32 and the second restricting portion 34, that is, on the inner side of the tank of the wall portion 12 </ b> A of the tank 12. In addition, double seal projections 36 are formed continuously in parallel over the entire outer periphery 30 </ b> A of the grommet mounting portion 30.

  The seal protrusion 36 is a seal portion that comes into contact with the inner peripheral surface 40 of the grommet 16 in a liquid-tight state. The seal protrusion 36 of this example is formed so as to protrude from the outer peripheral surface 30A in a substantially triangular shape.

(Main part configuration)
Next, the grommet 16 and the breathing pipe 38 will be described in detail.

  As shown in FIGS. 4A and 4B, the grommet 16 is liquid-tightly attached to the above-described grommet body 52 attached to the attachment hole 14 (see FIG. 1) and the breathing pipe 38 (see FIG. 1). And is integrally formed of a rubber material as an elastic material. The elastic material that is the material of the grommet 16 may be an elastomer material (rubber-like elastic polymer) or the like.

  3 and 4, the grommet main body 52 is a substantially cylindrical member as a whole, and seals between the outer peripheral surface 30A of the housing 22 and the mounting hole 14 shown in FIG. 20 is held in the mounting hole 14.

  As shown in FIG. 3, the grommet main body 52 is formed continuously from the outer appearance of the cylindrical portion 56 and the right side of the cylindrical portion 56 (the right side of FIG. 3). And a flange-shaped grommet guide 58 and an annular enlarged portion 64 having a mountain-shaped cross section that is formed continuously from the left side of the cylindrical portion 56 (left side of FIG. 3) and protrudes radially outward from the cylindrical portion 56. Configured.

  The cylindrical portion 56 is formed with a double ring-shaped grommet 60 having a substantially triangular cross section so as to protrude radially outward from the outer peripheral surface 56A of the cylindrical portion 56 slightly closer to the grommet guide 58. ing. In this example, two grommet ribs 60 are provided continuously in parallel over the entire circumference of the outer peripheral surface 56A.

  Further, the axial length (length X in the figure) of the grommet body 52 is the length between the first restricting portion 32 and the second restricting portion 34 of the housing 22 of the pump device 20 (the length Y shown in FIG. 1). ) Is set slightly smaller than. Therefore, in a state where the pump device 20 is inserted into the grommet body 52 and the grommet 16 is fitted into the grommet mounting portion 30, the pump device 20 is restricted from moving in the axial direction by the first restricting portion 32 and the second restricting portion 34. .

  That is, when an external force is applied to the pump device 20 in the direction of pulling out from the tank 12, the first restricting portion 32 comes into contact with one end portion of the grommet main body 52, and further movement is restricted. Further, when an external force in the direction of pushing into the tank 12 is applied to the pump device 20, the second restricting portion 34 comes into contact with the other end portion of the grommet main body 52, and further movement is restricted. Yes.

  Further, the inner peripheral surface 40 that connects the left and right ends of the grommet body 52 on the inner peripheral side is formed continuously with the circumferential surface portion 40A having substantially the same diameter in the axial direction and the left side of the circumferential surface portion 40A. A reduced diameter portion 40B formed so as to have a diameter smaller than that of the surface portion 40A, and a slope portion 40C formed continuously on the right side of the circumferential surface portion 40A and increasing in diameter toward the opening side are formed.

  The outer diameter of the outer peripheral surface 56A of the cylindrical portion 56 is formed to be substantially the same as the inner diameter of the mounting hole 14 (specifically, slightly larger than the inner diameter of the mounting hole 14). Thereby, when the grommet main body 52 is inserted into the mounting hole 14, the cylindrical portion 56 that is a contact portion with the mounting hole 14 is slightly reduced in diameter and elastically compressed in the grommet main body 52. The double ring-shaped grommets 60 are in close contact with the edge of the mounting hole 14 to ensure water tightness between the mounting hole 14 and the grommet body 52.

  The inner diameter of the circumferential surface portion 40A of the cylindrical portion 56 is substantially the same as the outer diameter of the outer peripheral surface 30A (see FIG. 1) of the grommet mounting portion 30 of the housing 22 (specifically, slightly smaller than the outer diameter of the outer peripheral surface 30A). ). As a result, when the pump device 20 is inserted into the inner peripheral surface 40, the grommet body 52 is in a state where the inner peripheral surface 40 is slightly expanded by the grommet mounting portion 30 and elastically deformed. The double seal protrusions 36 (see FIG. 1) are in close contact with the inner peripheral surface 40 of the grommet main body 52 so as to ensure water tightness between the grommet main body 52 and the grommet mounting portion 30. .

  On the other hand, as shown in FIG. 1, the breathing pipe 38 communicating the inside of the motor unit with the outside (atmosphere) is attached to the mounting hole 14 formed in the wall 12 </ b> A of the tank 12 by the pump device 20 by the grommet body 52. In this state, it extends downward in the direction of gravity. Furthermore, the opening part 38A which open | releases the air inside a motor part outside (atmosphere) is provided in the edge part below gravity direction.

  As shown in FIGS. 3 and 4, the mounting portion 54 that is liquid-tightly attached to the breathing pipe 38 has a substantially cubic outer diameter shape, and is a cylindrical breathing pipe that accommodates the breathing pipe 38. A housing part 70 is formed. The length of the breathing pipe 38 (length C shown in FIG. 1) is made longer than the length of the breathing pipe housing part 70 (length Z shown in FIG. 3).

  Further, a communication hole 72 having a diameter smaller than that of the breathing pipe housing part 70 is provided below the breathing pipe housing part 70, and a lower end of the communication hole 72 reaches the lower surface 54 </ b> A of the mounting part 54 and is opened. Yes. That is, the opening 38 </ b> A of the breathing pipe 38 is configured to contact the hole peripheral wall surface 80 of the communication hole 72 (see FIG. 1).

  Further, on the lower surface 54A of the mounting portion 54, a resinous microporous film 74 as a waterproof sheet that blocks the intrusion of liquid and allows the passage of gas so as to cover the communication hole 72 by an adhesive. It is bonded and fixed to the lower surface 54A. That is, the gas passing through the breathing pipe 38 is open to the outside (atmosphere) through the microporous film 74. In addition, as a waterproof sheet, the sheet | seat member etc. which are formed from polytetrafluoroethylene (PTFE) as an example can be used.

  Furthermore, the mounting portion 54 has a mounting opening 76 through which the breathing pipe 38 passes when the breathing pipe 38 is housed in the breathing pipe housing portion 70 in a direction in which the grommet body 52 is mounted on the pump device 20 (shown in FIG. 3). It opens in the direction of arrow B). Further, the three opening surfaces 78A, 78B, 78C constituting the mounting opening 76 are tapered so as to widen the mounting opening 76 outward.

  With this configuration, the breathing pipe 38 is accommodated in the breathing pipe accommodating portion 70 of the attaching portion 54 at the same time that the pump device 20 is to be attached to the grommet main body 52. Specifically, when the pump device 20 is moved in the direction of arrow G shown in FIG. 1 and the pump device 20 is attached to the grommet body 52, the breathing pipe 38 tries to pass through the attachment opening 76. The breathing pipe 38 comes into contact with the tapered opening surfaces 78A, 78B, 78C and presses the opening surfaces 78A, 78B, 78C. When the opening surfaces 78A, 78B, 78C are pressed, the mounting portion 54 is elastically deformed to expand the mounting opening 76, the respiratory pipe 38 is received in the respiratory pipe storage portion 70, and the mounting portion 54 is elastically restored. Accordingly, the breathing pipe 38 is mounted on the mounting portion 54 in a liquid-tight manner.

  On the other hand, as shown in FIG. 2, the pump device 20 has a drip cutting wall 82 so as to surround a part of the mounting portion 54 in a state where the breathing pipe 38 is liquid-tightly mounted on the mounting portion 54. Is provided. Specifically, two plate-shaped drip cutting walls 82 are extended downward in the direction of gravity so as to sandwich the mounting portion 54.

  As a result, when water droplets adhere to the outer surface of the pump device 20 due to the submergence of the pump device 20 temporarily, the adhering water droplets flow downward in the direction of gravity along the outer surface of the pump device, but travel along the outer surface. Thus, the water droplets flowing downward in the gravity direction are dropped from the outer surface of the pump device 20 by the droplet cutting wall 82 and do not enter the joint between the mounting portion 54 and the pump device 20.

(Action / Effect)
According to the configuration described above, as shown in FIG. 1, the cylindrical grommet body 52 is inserted into the circular mounting hole 14 formed in the wall portion 12 </ b> A of the tank 12, and the inner peripheral surface of the grommet body 52. By inserting the grommet mounting portion 30 of the housing 22 of the pump device into 40, the pump device 20 is held in the mounting hole 14 of the tank 12.

  In this way, the breathing pipe 38 provided in the pump device 20 is accommodated in the breathing pipe accommodating portion 70 of the mounting portion 54 at the same time as the grommet main body 52 tries to hold the pump device 20.

  That is, as shown in FIGS. 2, 3, and 4, when the breathing pipe 38 attempts to pass through the mounting opening 76, the breathing pipe 38 contacts the tapered opening surfaces 78 </ b> A, 78 </ b> B, 78 </ b> C, 78A, 78B, 78C is pressed. When the opening surfaces 78A, 78B, and 78C are pressed, the mounting portion 54 is elastically deformed to expand the mounting opening 76, the respiratory pipe 38 is received in the respiratory pipe storage portion 70, and the mounting portion 54 is elastically restored. Thereby, the breathing pipe 38 is attached to the attachment portion 54 in a liquid-tight manner. Further, the open port 38 </ b> A of the attached breathing pipe 38 hits the hole peripheral wall surface 80 of the communication hole 72.

  Here, in order to cover the communication hole 72, a liquid fine porous film 74 as a waterproof sheet that allows the passage of gas while blocking the intrusion of liquid is bonded and fixed to the lower surface 54A by an adhesive. It has been. That is, the fine porous film 74 blocks the intrusion of liquid into the breathing pipe 38 and allows gas to pass through the breathing pipe 38.

  Thus, by providing the fine porous film 74 on the mounting portion 54 of the grommet 16, the pressure difference between the motor portion and the outside air is eliminated without increasing the number of assembled parts, and the breathing pipe is temporarily submerged. Even in this case, water can be prevented from entering the motor unit.

  Further, by providing the drip cutting wall 82 so as to sandwich the mounting portion 54, water can enter the motor portion from the breathing pipe by suppressing the ingress of water droplets at the joint between the mounting portion 54 and the pump device 20. Can be prevented.

  In addition, by using a resin-made fine porous film 74 as the waterproof sheet, a general-purpose product can be used as the waterproof sheet. Even when the breathing pipe 38 is temporarily submerged, the fine porous film 74 remains in the motor unit. Water can be prevented from entering.

  Further, by making the length of the breathing pipe 38 longer than the length of the breathing pipe accommodating portion 70, the hole peripheral wall surface 80 of the communication hole 72 is easily brought into close contact with the opening 38 </ b> A of the breathing pipe 38 by the elasticity of the mounting portion 54. be able to.

  Next, a second embodiment of the washer device of the present invention will be described with reference to FIGS. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, in the second embodiment, the breathing pipe 90 provided in the pump device 20 is not extended linearly downward in the direction of gravity as in the first embodiment. , Bent in an L shape.

  Specifically, the breathing pipe 90 extends downward in the direction of gravity and is bent toward the mounting portion 100 by a bent portion 90A, and the opening 90B of the breathing pipe 90 is opened toward a substantially horizontal direction. Yes.

  Furthermore, the mounting portion 100 is provided with a breathing pipe housing portion 102 that houses the opening 90B of the breathing pipe 90 and has a ceiling closed. When the opening 90B of the breathing pipe 90 is accommodated in the breathing pipe housing 102, the guide surface 104 configured by a mortar-shaped tapered surface that guides the opening 90B of the breathing pipe 90 to the breathing pipe housing 102 is provided. Is formed.

  With this configuration, the pump device 20 is intended to be attached to the grommet main body 52, and at the same time, the opening 90 </ b> B of the breathing pipe 90 is accommodated in the breathing pipe accommodation portion 102 of the attachment portion 100. Specifically, when the pump device 20 is moved in the direction of the arrow G shown in FIG. 6 and the pump device 20 is attached to the grommet body 52, the opening 90B of the breathing pipe 90 is guided by the guide surface 104 and accommodates the breathing pipe. Part 102 is accommodated.

  In this way, the breathing pipe 90 is bent at the bent portion 90A, and the opening 90B of the breathing pipe 90 is directed to the mounting portion 100, whereby the opening 90B of the breathing pipe 90 is received in the breathing pipe storage portion 102 of the mounting portion 100. In doing so, the opening 90B can be accommodated in the breathing pipe accommodating portion 102 without greatly elastically deforming the mounting portion 100.

  In the above embodiment, the fine porous film 74 is bonded and fixed to the outer surface so as to cover the communication hole 72 of the mounting portion 54, but is not limited thereto, and is bonded and fixed to the peripheral wall surface 80 of the communication hole 72. May be.

It is sectional drawing which showed the washer apparatus which concerns on 1st Embodiment of this invention. It is the enlarged front view which showed the washer apparatus which concerns on 1st Embodiment of this invention. It is a side view including the partial cross section of the grommet employ | adopted for the washer apparatus which concerns on 1st Embodiment of this invention. (A) (B) It is a perspective view of the grommet employ | adopted as the washer apparatus which concerns on 1st Embodiment of this invention. It is the whole front view showing the washer device concerning a 1st embodiment of the present invention. It is sectional drawing which showed the washer apparatus which concerns on 2nd Embodiment of this invention. It is the enlarged front view which showed the washer apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Washer apparatus, 12 ... Tank, 12A ... Wall part, 14 ... Mounting hole, 16 ... Grommet, 20 ... Pump apparatus, 38 ... Breathing pipe, 38A ... Open port, 52... Grommet body, 54... Mounting portion, 70... Breathing pipe housing portion, 72 .. communication hole, 74 .. fine porous film (porous film), 80. ..Perimeter wall surface of hole, 82 ... drip wall, 90 ... breathing pipe, 90B ... opening, 100 ... mounting part, 102 ... breathing pipe housing part

Claims (4)

A pump device comprising a motor unit and a pump unit driven by the motor unit;
A cylindrical shape that is inserted into a mounting hole formed in a wall portion of a tank in which liquid is stored and that holds the pump device in the mounting hole by inserting a part of the pump device into an inner peripheral surface. Grommet body,
A breathing pipe that is provided integrally with the grommet main body and communicates with the motor portion provided in the pump apparatus in a state where a part of the pump apparatus is inserted into the grommet main body is liquid-tightly attached. A mounting part;
Provided in a communication hole formed in the mounting portion, and in a state where the breathing pipe is liquid-tightly mounted on the mounting portion, it prevents the liquid from entering the breathing pipe and allows gas to pass therethrough. Tarpaulin,
A washer device comprising: The breathing pipe extends downward in the gravitational direction in a state where the pump device is attached to the attachment hole formed in the wall portion of the tank by the grommet body,
The pump device is provided with a drip wall that surrounds at least a part of the mounting portion and extends downward in the direction of gravity while the mounting portion is liquid-tightly mounted on the breathing pipe. The washer device according to claim 1.   The washer device according to claim 1 or 2, wherein the waterproof sheet is a porous film made of resin. The grommet body and the mounting portion are integrally formed of an elastic material,
The mounting portion is provided with a breathing pipe housing portion that houses the breathing pipe,
The length of the breathing pipe is longer than the length of the breathing pipe housing part,
The washer device according to any one of claims 1 to 3, wherein an opening of the breathing pipe hits a peripheral wall surface of the communication hole.

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