JPS6220720Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a pump for vehicles in which the motor part is housed inside the pump housing, and the space around the motor part is communicated with outside air. Regarding pore structure.

[Conventional technology]

Conventionally, the ventilation hole of this type of pump was provided above the pump housing, so if rainwater or wash water leaks from above when installed, water may enter the inside of the pump housing and cause motor failure. It was hot. It is also possible to provide a vent with the vent facing downward, that is, toward the ground, but in the case of a car wash pump, for example, it may be exposed to splashing water from the ground, and the pump chamber may be exposed to water splashing from the ground. Because of this, it was difficult to install, and the effective structure was unknown.

[Problem that the invention attempts to solve]

Therefore, an object of the present invention is to obtain a pump vent structure in which water splashed by a vehicle and the like hardly enters into the pump housing even if the vent hole is provided on the ground side of the pump housing.

[Structure of the present invention]

For this reason, the present invention provides a pump chamber 6 at one end of the pump housing 3, and a cover 5 that is joined to the pump housing 3 and encloses the pump chamber 6 at one end of the pump chamber 6.
A motor part for driving an impeller 4 rotating inside the pump chamber 6 is built inside. Then, in the pump installed state, the cover 5 is attached to the pump housing 3 toward the ground. In such a pump, the present invention further has the following configuration.

The cover 5 has a raised bottom-shaped trough 32 and this trough 3.
2 and has a wall portion 35 extending in the axial direction of the shaft 7 of the motor portion. A ventilation hole 24 is formed in the wall portion 35 and extends through the wall portion 35 in the radial direction of the shaft 7. And this vent 2
4 and the vent structure of the vehicle pump is formed so that the space around the motor section inside the pump housing 3 communicates with the outside of the pump via a gap 37 between the pump chamber 6 and the outer wall of the pump housing 3. be.

〔Example〕

An embodiment of the structure of the present invention shown in the drawings will be described below.

1 to 4 are an external view and a sectional view. 1
is a washer fluid inlet, which is press-fitted into a hole provided in the side wall of a washer tank (not shown).
2 is a discharge port, and a washer hose (not shown) is press-fitted into the tip thereof.

Note that a nozzle facing the vehicle window is attached to the tip of this washer hose. Reference numeral 3 denotes a pump housing, which is made of nylon and has a suction port 1 and a discharge port 2 integrally molded, and is located at one end of the pump housing 3 (on the left side in FIG. 1).
has a pump chamber 6. 4 is an impeller forming a centrifugal pump, and is made of polyacetal resin. Reference numeral 5 designates a bottom cover made of nylon. This cover 5 is provided at one end of the pump chamber 6 (on the left side in FIG. 1), and is joined to the pump housing 3 so as to constitute the bottom of the pump chamber 6. 6 is included. Next, the motor portion provided within the pump housing 3 will be explained. 7 is the shaft of the motor; 8 is a rubber oil seal that slides on the shaft 7 and is supported by the pump housing 3; 9 is a bearing, 10 is a motor armature, and 11 is a commutator. Further, 12 is a ring-shaped magnet surrounding the armature, and 13 is a cylindrical yoke made of iron, forming a magnetic circuit.

15 is a brush that slides on the commutator 11; 16 is a metal brush holder that supports the brush 15; 17
is a brush spring that presses the rear end of the brush 15 and rubs it against the commutator 11. The motor portion made up of these members drives the impeller 4. 18 is a cap press-fitted into the pump housing 3, and a connector guide 1 for inserting the connector.
9, a terminal 20 for inputting power, and a protrusion 21 for holding the brush spring 17, and is made of nylon.

In the above configuration, when the washer switch (not shown) is turned on, the battery is connected to the terminal 20 → brush holder 16 → brush 15 →
A current flows through the commutator 11 and the terminal 20 → brush holder 16 → brush spring 17 → brush 15 → commutator 11, and the shaft 7 of the motor and the impeller 4 connected thereto rotate, and the suction port 1
The washer liquid is sucked in and discharged to the discharge port 2.

At this time, the washer fluid fills the pump chamber 6, but does not enter the motor chamber 23 where the armature 10 of the motor is housed, and the inside of the motor chamber 23 is filled through the ventilation hole 24 shown in FIG. communicates with the atmosphere.

The pump housing 3 and the cover 5 are connected at a portion 25 by ultrasonic welding, and the cap 18 and the pump housing 3 are connected at a portion 26 by concave-convex fitting. Further, a metal terminal 20 is press-fitted into the cap 18 using ultrasonic vibration, and the cap 18 and the terminal 20 are
gaps are sealed.

The structural functions of each part will be specifically explained below.

First, the cover 5 at the bottom of the pump housing 3 is attached to the ground when the pump is installed.
Also, the structure of the ventilation hole 24 (FIG. 5) will be explained. The shape of the cover 5 when viewed from the bottom is as shown in FIG. 2, and is provided with reinforcing ribs 30, and is positioned by a peripheral linear portion 31 so as not to rotate with respect to the pump housing 3.

Reference numeral 32 denotes a raised bottom-shaped valley portion surrounded by the ribs 30, and is depressed with respect to the rib 30 and the surrounding ring-shaped raised portion 33. That is, there is a height difference between the flat part of the valley part 32 and the flat part of the ring-shaped raised part 33, and the ventilation hole 24 is a vertical ring that is not visible from FIG. 2 and is provided between the height difference. There are a total of four openings in the shaped wall portion 35 (FIG. 5).

This wall portion 35 surrounds the valley portion 32,
It extends in the axial direction of the shaft 7. Further, FIG. 5 is a sectional view taken along the line BB in FIG. 2. FIG. 5 shows a cross-sectional shape across one of the vent holes 24. Therefore, the outside of the pump communicates with the space around the motor section inside the pump housing via the vent hole and the gap 37 between the pump chamber 6 and the outer wall of the pump housing 3.

In addition, since this FIG. 5 is a sectional view taken along arrow B-B in FIG. 2, the ventilation hole 24 shown here is
This is the one on the upper right side of the figure.

Since the ventilation hole 24 is provided to penetrate the wall portion 35 in the radial direction of the shaft 7 in this way, water or rainwater during vehicle washing does not enter the armature 10 portion of the motor through the ventilation hole 24. , the motor will not deteriorate or become inoperable.
In addition, the ventilation holes 24 are distributed into four in total, and in particular, the ventilation holes 24 have sufficient strength between them.
A portion of the vertical wall 35 (FIG. 5) remains. In other words, the ring-shaped raised portion 33 in FIG.
The ventilation holes 24 are arranged in a dispersed manner so that a part of the cover 5 will not be damaged even if an external force is applied to the flat surface 33a between the ventilation holes 24, and a part of the wall 35 between the ventilation holes 24 is formed into a columnar shape. It is reinforced by intervening, and if part of this wall 35 is removed,
There are a total of two ventilation holes 24 on the left and right sides as shown in FIG. 6, but since there is a risk of damage if the portion 33a is pressed, they are divided into four.

Further, the cover 5 and the pump housing 3 are welded together by ultrasonic heating. FIG. 6 shows the state before welding, and FIGS. 1 and 5 show the state after welding.

The cover 5 is inserted into the pump housing 3 by applying pressure with a tool (ultrasonic horn) that vibrates at an ultrasonic frequency. As a result, the contact surface 40 (sixth
(Figure) generates frictional heat, causing the resin in that area to melt and weld together.

Next, the shapes of the pump chamber 6, the discharge port 2, and the pump housing 3 will be explained.

As shown in FIG. 1, a suction port 1, a discharge port 2, and a bearing holding portion 3c are integrally molded into the pump housing 3. 45 is an opening located at the upper center of the pump chamber 6, into which washer liquid flows. Reference numeral 46 is a recessed portion that accommodates a rubber seal 8 that seals the washer fluid from the pump chamber 6 to prevent it from flowing into the motor chamber 23.

Next, a method for assembling this pump will be explained.

FIG. 7 shows the state during assembly, with the cap 18 on the pedestal 80 of the assembly press machine and the shaft 7 on the cap 18.
Place the rotor portion 10a of the motor which is pivotally supported,
Next, the pump housing 3 in which the guide rod 81 is skewered through the bearing 9 on its own side in advance
The assembly consisting of the magnet 12 and yoke 13 is lowered from above to the bottom of the rotor 10a portion of the motor, and finally the tip of the shaft 7 of the motor is inserted into the truncated conical recess 83 of the tip 82 of the guide rod 81 as shown in the figure. Make sure that 7a fits in.

Note that the guide rod 81 and the shaft 7 are round rods having the same diameter, and the shaft 7 and the guide rod 81 are aligned in a straight line with the shaft 7 fitted into the truncated cone-shaped recess 83.

Further, the guide rod 81 is slidably passed through the hole 86 of the upper holding member 85.

Next, from the illustrated state, when the upper holding member 85 is lowered while leaving the guide rod 81 and the motor in the same position, the pump housing 3 will slide downward along the guide rod 81. The ring-shaped groove 26a of the pump housing 3 and the ring-shaped protrusion 26b of the cap 18 are fitted in a concave-convex manner, so that the cap 18 and the pump housing 3 are connected. .

In the next step, the guide rod 81 and the upper pressing member 85
is removed, and the pump housing 3 is removed as shown in Figure 6.
The cover 5 is placed on the bottom of the pump chamber 6, and the cover 5 is pressed onto the pump housing 3 by an ultrasonic horn (not shown), and the two are welded together as described above.

Since the cover 5 is welded to the bottom of the pump chamber 6 in this way, the sealing performance is good and it can be quickly assembled without using adhesives or sealing members.
In addition, cap 1, which does not require much sealing performance,
The connection between the pump housing 3 and the pump housing 3 is simple because it is press-fitted using the concave-convex fitting 26.

In addition, the pump housing 3 is integrally molded with synthetic resin, and the shape of the pump chamber 6, the center of the pump chamber,
The center of the motor shaft 7 and the position of the field magnet 12 of the motor can be accurately determined, and in particular, the center of the motor shaft 7 and the center of the pump chamber 6 can be accurately positioned, resulting in good dimensional accuracy.

[Effect of idea]

As described above, in the present invention, a vertical wall extending in the axial direction of the motor shaft of the cover joined to the pump housing is provided with a ventilation hole that penetrates in the radial direction of the shaft. As for water, since the vent holes are opened perpendicularly to the direction of water intrusion, it is difficult for water to enter, and there is no problem at all with respect to intrusion of rainwater from the sky. In other words, the effect is that water flying from the axial direction of the shaft is less likely to enter the pump. Furthermore, even if water should enter, the weight of the water will allow it to be drained out through the vent hole.

[Brief explanation of the drawing]

1 is a partial sectional view of the pump of the present invention taken along the arrow A-A in FIG. 2; FIG. 2 is a left side view of the pump;
The figure is a right side view of the pump, Figure 4 is a bottom view of the pump, Figure 5 is a partial sectional view taken along arrow B-B in Figure 2, and Figure 6 is a view of the pump before the cover is assembled to the pump housing. FIG. 7 is a sectional view similar to FIG. 1 showing the state, and an elevational view of the pump according to the present invention in the assembly process. 3...Pump housing, 6...Pump chamber, 5
...Cover, 4...Impeller, 32...Tanibe, 7
...shaft, 35 ... wall, 24 ... ventilation hole,
37...Gap.

Claims (1)

[Claims for Utility Model Registration] A pump chamber 6 is provided at one end of a pump housing 3, a cover 5 is provided at one end of the pump chamber 6 and is joined to the pump housing 3 to enclose the pump chamber 6, and A motor part for driving an impeller 4 that rotates in the pump chamber 6 is built in the pump housing 3, and the cover 5 is attached to the ground of the pump housing 3 when the pump is attached. 5 has a raised-bottomed trough 32 and a wall 35 surrounding the trough 32 and extending in the axial direction of the shaft 7 of the motor section. A vent hole 24 is formed to penetrate through the vent hole 24 and the air around the motor portion inside the pump housing 3 via the vent hole 24 and a gap 37 between the pump chamber 6 and the outer wall of the pump housing 3. A vent structure for a vehicle pump characterized by communicating a space with the outside of the pump.