JP2008240543A - Motor driven water pump fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart a water-proofing function while securing the communication of a breathing hole with the outside, ensure peripheral positioning of a motor driven water pump to be held by a bracket, and prevent the peripheral turn thereof due to vibration. <P>SOLUTION: The motor driven water pump 1 consists of an impeller 14 inside, a pump body 2 with a motor 30 for driving it, and the breathing hole 27 formed in the pump body 2 in communication with the inside of the pump body 2. In the breathing hole of the motor driven water pump, a boss portion 28 is provided protruding from the pump body. On an elastic body attached to the pump body 2, a protruding cover 47 is formed for covering the boss portion 28 in the breathing hole 27. A breathing passage 50 is formed inside to communicate the breathing hole 27 with the outside. In a bracket 7 which clamps the elastic body 45 at its outside to support the pump body 2, a fitting hole 44 is formed to which the cover 47 is fitted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fixing device for an electric water pump that is used in a vehicle and circulates engine coolant.

As an apparatus for fixing the electric water pump, for example, Patent Document 1 can be shown. In this example, an elastic belt-like member (rubber-like member) is wound around the outer periphery of a cylindrical coupling chamber located at the center of the electric water pump, and is further held by wrapping the outer periphery with a bracket.
JP 2005-299602 A

  In general, when a pump body equipped with a motor or the like is sealed, condensation occurs inside due to a temperature change or the like, and the moisture causes short circuit or rust. For this countermeasure, the electric water pump has a breathing hole communicating with the outside in the pump body.

  In Patent Document 1, the vent hole 4 is formed in the pump body, and the belt-like member B is used to prevent rainwater and the like from entering from the hole 4, but in order to maintain a communication state with the outside, A through hole 17 and a groove-like passage 18 are formed in the belt-like member B.

  Also, in the example of the electric water pump that is actually assembled to the vehicle, three bosses are provided on the outer periphery of the cylindrical coupling chamber, and elastic members (grommets) are attached to the bosses and fixed to the brackets. ing. Then, the ventilation hole has a boss shape, and a waterproof filter and a waterproof cover are provided to allow ventilation.

  In Patent Document 1, it is not sufficient to prevent water from entering the vent hole 4 provided in the pump body. The vent hole 4 is located below the pump body, and an air inlet / outlet port 21 communicating with the groove-like passage 18 exists in the vicinity. When water enters from the air inlet / outlet port 21, there is a possibility that the area around the outlet of the vent hole 4 will be submerged and the communication with the outside may be blocked.

  Moreover, since it supports on the bracket C via the strip | belt-shaped member 8 from above a cylindrical pump body, positioning of the pump body in the circumferential direction is difficult. After the assembly, rotation in the circumferential direction due to the vibration of the vehicle, the occurrence of a malfunction in the communication state of the vent hole 4 and the through-hole 17 and the groove-like passage 18, and further, the vent hole 4 and the through-hole which are the assembly work There was a complicated workability in the work of fixing the bracket C after the position with the hole 17 was matched. Moreover, in the example of the well-known electric water pump assembled | attached to the said vehicle, there are many parts number and the workability | operativity of the assembly | attachment was also not good.

  Therefore, the present invention provides an electric water pump that has a waterproof function while ensuring communication to the outside of the breathing hole, and is capable of rotating in the circumferential direction due to vibration as well as ensuring circumferential positioning. The purpose is to prevent.

  An electric water pump according to the present invention includes an electric water pump having at least an impeller inside, a pump body having an electric motor for driving the impeller, and a breathing hole formed in the pump body. In the above, the elastic body attached to the pump body and protruding from a cover that covers the boss of the breathing hole, and the breathing hole formed on at least one of the pump body and the elastic body communicate with the outside. It is characterized by comprising a breathing passageway (claim 1).

  As a result, since there is a boss in the breathing hole that communicates the internal air with the outside, even if water enters the breathing passage, the height of the boss in the breathing hole cannot be overcome, and there is water in the pump body. Cannot penetrate.

  Since the boss part of the breathing hole and the cover surrounding the breathing hole are fitted into the fitting part formed on the bracket that supports the pump body (Claim 2), not only the determination of the circumferential position is ensured but also the vibration Circumferential rotation due to such as is also prevented.

  A gap is provided between the boss portion of the breathing hole and the cover covering the breathing hole, and the breathing passage communicates with the breathing passage (claim 3). Thereby, the breathing hole and the breathing passage are reliably communicated.

  One or a plurality of the respiratory passages are formed inside the elastic body (claim 4). Further, the boss portion of the breathing hole is provided so as to be directed upward or obliquely upward at least when fixed to the vehicle. In other words, the boss portion has only to be upward from the horizontal plane in the vehicle mounted state.

  As described above, according to the present invention, since the breathing hole has the boss portion and is covered with the cover, even if water enters the breathing passage formed in the elastic body, the height of the boss portion may be exceeded. It is not possible to prevent water from entering (claim 1).

  Further, since the boss portion of the breathing hole and the cover covering it are fitted into the fitting portion of the bracket, it is possible to ensure circumferential positioning and prevent circumferential rotation due to vibration or the like (claim 2).

Since there is a gap between the boss portion of the breathing hole and the cover covering the breathing hole and communicates with the breathing passage, the breathing hole and the breathing passage formed in the elastic body reliably communicate with each other. (Claim 3).

Since the boss portion of the breathing hole is installed upwards at least when fixed to the vehicle, it is possible to obtain the benefit (height) of the protrusion of the boss portion, so that water can be overcome. Intrusion can be prevented. Even if water permeates into the breathing passage formed in the elastic body, it is possible to prevent water from accumulating in the cover and prevent the communication with the outside from being blocked (Claim 5).

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

1 and 2, a fixing device and an exploded perspective view of the electric water pump 1 are shown. First, the outline of the electric water pump 1 will be described. The pump body 2 is an elongated cylindrical member, and is roughly composed of a pump part 3 which is three members, a coupling part 4 and a motor part 5. And it fixes with the bracket 7 and is attached to the vehicle which is not shown in figure.

The pump section 3 will be described with reference to FIG. 3. The pump section 3 has a cylindrical shape, is formed with a suction port 9 and a discharge port 10, and a separation support 12 is formed on the entire surface on the side opposite to the suction port. Is formed.

An impeller 14 is disposed in the pump chamber 13 and is supported by the separation support 12 at one end. The impeller 14 is rotated by an electric motor 30 described below, and a driven magnet 17 is attached to the rotating shaft 15. The driven magnet 17 transmits a rotational force from a motor 30 to be described below, and the impeller 14 is rotated. The engine cooling water is sucked from the suction port 9 and pressurized to flow out from the discharge port 10.

The coupling part 4 is a cylindrical member 18, one side of which is divided by the separation support 12 of the pump part 3, and the other side is provided with a separation wall body 19 to form a sealed coupling chamber 20. Yes. In the coupling chamber 20, a drive magnet 22 is arranged in a cylindrical shape, supported via a holding portion 23, and fixed to a drive shaft 33 of an electric motor 30 described below.

The drive magnet 22 is opposed to the follower magnet 17 via the separation support 12, and when it is rotated, torque is transmitted and the impeller 14 can be rotated. The coupling chamber 20 in which the drive magnet 22 is disposed has a through hole 25 formed in the separation wall 19 and communicates with a motor chamber 31 described below. Further, a breathing hole 27 is formed in the radial direction of the cylindrical member 18 of the coupling portion 4 and has a boss portion 28 protruding outward. The coupling part 4 is attached to the pump part 3 with screws 29.

The motor unit 5 has a cylindrical shape and is a motor chamber 31 in which the electric motor 30 is disposed. The motor chamber 31 is partitioned by the separation wall body 19 of the coupling portion 4 that constitutes one surface of the motor chamber 31, but is communicated by the through hole 25. The electric motor 30 in the motor chamber 31 has a drive shaft 33 that penetrates the separation wall body 19, and the holding portion 23 is fixed to the penetration portion. The motor unit 5 is attached to the coupling unit 4 with screws (not shown).

The electric water pump 1 is configured as described above, and is fixed to the bracket 7 as described below. First, the bracket 7 is composed of a base portion 7a and a lid portion 7b. The base portion 7a is a superposition having a semicircular arc portion 37 having a locking piece 37a and a hole 38a. It consists of the part 38 and the fixing | fixed part 39 which has the hole 39a fixed to a vehicle.

And the said cover part 7b consists of the semicircular arc part 41, the superposition | polymerization parts 42 and 43 on the right and left, and the fitting hole 44 formed in the top of the semicircular arc part 47, The superimposition part 42 does not show in figure Has an engagement hole, and the other overlapping portion 43 has a hole 43a. Then, the inner diameter of the fitting hole 44 is equal to or slightly larger than the outer diameter of the cover 47 described below.

In order to support the electric water pump 1 with such a bracket 7, it is attached via an elastic body 45 made of rubber or the like. That is, the elastic body 45 includes two arc-shaped members 45a and 45b, and a cover 47 projecting in the radial direction is formed on one arc-shaped member 45a. The cover 47 is cylindrical and has an inner diameter larger than the diameter of the boss portion 28 of the breathing hole 27 described above, and is configured so that a gap 48 is formed around when it is fitted to the boss portion 28.

Further, a breathing passage 50 communicating with the cover 47 and communicating with the outside is formed inside the arcuate member 45a. The breathing passage 50 communicates with the breathing hole 27 through the gap 48 and communicates with the coupling chamber 20 and the motor chamber 31 in the pump body 2. As a result, the coupling chamber 20 and the motor chamber 31 communicate with the outside air, and condensation is prevented from occurring inside. A plurality of breathing passages 50 may be formed, or a labyrinth such as a lattice shape may be used. The arcuate member 45b of the other elastic body 45 is merely a circular arc. The shape of the arcuate member 45a may be appropriately designed along the outer periphery of the cup part or the motor part, and the arcuate part 4b may be omitted.

Arc members 45 a and 45 b of the elastic body 45 are attached to the coupling portion 4 of the pump body 2, and the cover 47 is fitted on the boss portion 28 of the breathing hole 27. Then, the base portion 7a and the lid portion 7b of the bracket 7 are attached. At that time, the fitting hole 44 of the lid portion 7 b is fitted into the cover 47. Then, the base portion 7 a and the lid portion 7 b are coupled by the screw 52, and the electric water pump 1 is supported by the bracket 7.

As described above, when the electric water pump 1 is supported by the bracket 7, the cover 47 is fixed by the fitting hole 44, and positioning in the circumferential direction is prevented, and rotation in the circumferential direction from vibration or the like is prevented. Then, the inside of the pump body 2 is communicated with the outside through the breathing hole 27, the gap 48, and the breathing passage 50, and condensation does not occur inside the pump body 2. Even if vibration is applied, the cover 47 and the fitting hole 44 are in a locked state, and the communication state of the breathing means is not blocked without rotating.

As described above, since the boss portion 28 is provided in the breathing hole 27, even if water enters the breathing passage 50 formed in the elastic body 45, the height of the boss portion 28 cannot be exceeded. Can prevent intrusion into the pump body 2.

The boss portion 28 of the breathing hole 27 protruding from the coupling portion 4 of the pump body 2 is installed upward at the time of assembly. It has the effect of preventing water from entering.

1 is a perspective view of an electric water pump fixing device according to an embodiment of the present invention. It is a disassembled perspective view of an electric water pump fixing device same as the above. It is an expanded sectional view of the electric water pump at the time of the state fixed by the electric water pump fixing device same as the above. It is an expanded sectional view of the principal part which shows the relationship between the boss | hub part of the breathing hole which protrudes in a pump body, the cover of the elastic body which wraps this, and the fitting hole of a bracket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric water pump 2 Pump body 3 Pump part 4 Coupling part 5 Motor part 7 Bracket 13 Pump chamber 14 Impeller 15 Rotating shaft 18 Cylindrical member 20 Coupling chamber 25 Through-hole 27 Breathing hole 28 Boss part 30 Electric motor 31 Motor Chamber 37 Semicircular arc part 41 Semicircular arc part 44 Fitting hole 45 Elastic body 47 Cover 48 Crevice 50 Breathing passage

Claims (5)

In an electric water pump having at least an impeller inside, a pump body having an electric motor for driving the impeller, and a breathing hole formed in the pump body in communication with the inside of the pump body,
A boss provided protruding from the pump body in the breathing hole of the electric water pump;
An elastic body attached to the pump body and formed by protruding a cover that covers the boss of the breathing hole;
An electric water pump fixing device comprising a breathing passage formed in at least one of the pump body and the elastic body and communicating the breathing hole with the outside.   2. The electric water pump fixing device according to claim 1, further comprising: a bracket which is supported from the outside of the elastic body so as to support the pump body, and which forms a fitting portion into which the cover is inserted.   3. The electric water pump fixing device according to claim 1, wherein a gap is formed between the boss portion of the breathing hole and the cover covering the breathing hole and communicates with the breathing passage.   4. The electric water pump fixing device according to claim 1, wherein one or a plurality of the breathing passages are formed inside the elastic body.   The electric water pump fixing device according to any one of claims 1 to 4, wherein the boss portion of the breathing hole is provided at least upward or obliquely upward when the vehicle is fixed.

Images