JP2528845B2 - Windshield Washer Pump for Vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle windshield washer pump used in a washer device for injecting a cleaning liquid onto a windshield glass of an automobile, for example. is there.

(Prior Art) Conventionally, for example, the above-mentioned vehicle windshield washer pump (hereinafter referred to as a washer pump) has been shown in FIGS. 3 and 4.

That is, the washer pump 100 shown in the figure has an impeller 111 that is fitted into the armature shaft 121 protruding from the motor section 120 in the pump chamber 110 and that rotates together with the armature shaft 121.
It has.

The impeller 111 integrally includes a blade portion 111a and a shaft portion 111b, and is made of synthetic resin such as polyacetal.
A D-shaped opening 111c is provided at the center of the shaft portion 111b so as to be fitted into the D-cut portion 121a formed at the tip of the armature shaft 121, that is, the lower end portion in FIG.

The impeller 111 rotates in the pump chamber 110 sandwiched between the pump wall 101a provided in the lower part of the casing 101 in FIG. 3 and the conical pump wall 112a provided in the upper part of the end bracket 112 in FIG. Then, the cleaning liquid stored in the washer tank 130 is sucked from the suction port 112a provided in the end bracket 112, pressurized in the pump chamber 110, and then the cleaning liquid is pressure-fed from the discharge port 101b provided in the casing 101. .

(Problems to be Solved by the Invention) However, when the washer pump 100 is operated as described above, the pressure P ₁ on the discharge port 103 side of the pump chamber 110 becomes higher than the pressure P ₂ on the suction port 102 side. Therefore, the impeller 111 fitted into the armature shaft 121 and rotating is
It moves downward in FIG. 3, that is, toward the conical pump wall 112a side of the end bracket 112, and is brought into a sliding state of surface contact with the conical pump wall 112a. Therefore, when the impeller 111 and the conical pump wall 112a are in sliding contact with each other when the washer pump 100 is operating, a frictional resistance is generated in the sliding portion, and depending on the increase in the frictional resistance, the conical pump wall is increased.
The 112a and the impeller 111 may generate heat. Then, due to this heat generation, the D-shaped opening 111c of the impeller 111 is melted, the armature shaft 121 spins idle, and there is a problem that the washer pump 100 fails in discharge.

(Object of the Invention) The present invention was conceived in order to solve the above-mentioned conventional problems, and an object thereof is to provide a washer pump which does not cause discharge failure, and its structure has a special device. It is a fancy thing.

[Structure of the Invention] (Means for Solving the Problems) A washer pump according to the present invention includes a washer pump including an impeller fitted into an armature shaft protruding from a motor portion in a pump chamber formed by a casing and an end cover. The pump is characterized in that an annular convex portion that is in sliding contact with the impeller is provided on a pump wall of an end cover that forms the pump chamber.

(Embodiment) Hereinafter, a washer pump according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

That is, reference numeral 1 is a washer pump, which is attached to a hole 20b provided in a lower side wall 20a of the washer tank 20 through a rubber packing 21, and the suction port 2 of the washer pump 1 is connected to the washer tank 20. It communicates with the inside of.

The washer pump 1 includes an impeller 6 that is fitted into the armature shaft 5 protruding from the motor portion 4 in the pump chamber 3 and that rotates together with the armature shaft 5.

The motor portion 4 is provided with a bearing 8 provided at one end of the motor yoke 7, that is, at the upper side in FIG. 1, and a casing 9 that is fitted into the other end opening of the motor yoke 7, that is, at the lower side in FIG. The bearing 10 rotatably supports the armature shaft 5. The armature shaft 5 has an armature 11 and a commutator on it.
The armature 11 is rotated together with the armature shaft 5 by pressing the brush 13 against the commutator 12 and energizing it. Also, this armature shaft 5
Has a lower end in FIG. 1 penetrating the bearing 10 and the water seal 14 provided in the casing 9, and is projected to the lower side of the casing 9, that is, the pump chamber 3. The D cut portion 5a is formed on the protruding portion.

On the other hand, the pump chamber 3 is located on the lower side in FIG. 1 with the motor portion 4 and the casing 9 separated from each other, and the pump wall 9a provided on the casing 9 and the conical pump wall 15 provided on the end cover 15 are provided.
The impeller 6 is provided in the space formed by a and.

The casing 9 has a discharge port which communicates with the pump chamber 3 and serves as a feed end of the cleaning liquid in the washer pump 1.
9a is provided on the left side in FIG.

The end cover 15 is provided with a suction port 2 and an introduction hole 15 that connects the suction port 2 and the pump chamber 3 to each other.
b is provided. In the end cover 15, a conical pump wall 15a that can form the pump chamber 3 is connected in an annular manner on the conical pump wall 15a in this embodiment, and the conical pump wall 15a is connected to the conical pump wall 15a as shown in FIG. An annular convex portion 15c protruding upward in the middle is provided.

The impeller 6 is composed of a blade portion 6a and a shaft portion 6b,
A D-shaped opening 6c that can be fitted into a D-cut portion 5a formed at the end of the armature shaft 5 on the pump chamber 3 side is provided at a substantially central position of the shaft portion 6b.

That is, the impeller 6 is the D provided on the impeller 6.
The armature shaft 5 with the shaped opening 6c protruding into the pump chamber 3
In the state of being fitted in the D-cut portion 5a of the end cover 15, the end cover 15 rotates in the pump chamber 3 while sliding on the annular convex portion 15c provided on the conical pump wall 15a.

In other words, here, in the washer pump 100 shown in the related art, the impeller 111 is a surface contact slide with respect to the conical pump 112a, but the impeller 6 is not in line contact with the annular projection 15c. It can be sliding. As a result, the conical pump wall 15a and the impeller 6 do not generate heat as in the conventional case, and therefore the discharge failure of the washer pump 1 caused by the melting of the D-shaped opening 6c provided in the impeller 6 is prevented. You can

[Effects of the Invention] As described above, according to the washer pump of the present invention, the washer having the impeller fitted in the armature shaft protruding from the motor portion is provided in the pump chamber formed by the casing and the end cover. In the pump, the pump wall of the end cover that forms the pump chamber is provided with an annular convex portion that is in sliding contact with the impeller, so that there is no discharge failure as in the conventional case, and as a result, long-term It has an excellent effect that it can be used over a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view for explaining a washer pump according to an embodiment of the present invention, and FIG. 2 is an external perspective view of each part showing an assembling relationship between an impeller and an end cover in the washer pump shown in FIG. FIG. 3 is a vertical cross-sectional view showing a conventional washer pump, and FIG. 4 is an external perspective view of each part showing an assembling relationship between an impeller and an end cover in the washer pump shown in FIG. 1 ... Vehicle windshield washer pump, 3 ... Pump chamber, 4 ... Motor part, 5 ... Armature shaft, 6 ... Impeller, 9 ... Casing, 15 ... End cover, 15a ... Pump wall , 15c …… Ring-shaped convex part.

Claims (1)

(57) [Claims] 1. A washer pump including an impeller fitted into an armature shaft projecting from a motor portion in a pump chamber formed by a casing and an end cover, wherein a pump wall of the end cover forming the pump chamber. A windshield washer pump for a vehicle, characterized in that an annular convex portion that is in sliding contact with the impeller is provided on the vehicle.