JP2009180179A - Motor pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor pump reduced in cost and assembling man-hours as compared with a conventional pump. <P>SOLUTION: A pump housing 3 sealing a front side of a stator housing 2 in an axial direction is a member forming a bottomed cylindrical pump housing 31 and a front insulator 33 extending rearward from a bottom 38 of the pump housing 31 as one unit. A front side of a stator housing 2 is sealed by the pump housing 31 and the front insulator 33 covers front ends of six core bodies 73 (hereafter, called as a front end 74). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric pump, and more particularly to an electric pump capable of facilitating assembly work, reducing weight, and reducing costs.

  With the reduction in price and weight of automobiles, there is a strong demand for lowering the cost of electric pumps, especially oil pumps for lubricating engine oil in automobiles. Moreover, simplification of an assembly process is desired as one element of cost reduction. However, an electric pump used as an oil pump for lubricating an engine oil of an automobile, in particular, an internal gear type electric pump generally has a complicated structure such as the use of a plurality of rotors, a large number of parts, and an assembly process. It is complicated. An example is shown below.

  As shown in FIG. 3, a housing 101 of a conventional electric pump 110 has a shape in which both ends of a cylindrical stator housing 102 are sealed by a pump housing 103 and a substantially disc-shaped rear housing 104. A stator core 107 is fitted into 102. The stator core 107 has a cylindrical outer peripheral portion 171 and is equally spaced in the circumferential direction of the outer peripheral portion 171, and inward in the radial direction from the inner peripheral surface 172 of the outer peripheral portion 171 (hereinafter referred to as inward). There are six core bodies 173 that are extended. A front insulator 133 is put on a front end portion (hereinafter referred to as a front end 174) of the six core main bodies 173, and a rear end portion (hereinafter referred to as a rear end 175) of the core main body 173 is covered. A rear insulator 134 is covered. Insulated conducting wires 120 are wound around each of the six core bodies 173 insulated by the front insulator 133 and the rear insulator 134, and a winding coil 121 having a magnetic flux direction directed radially inward is formed. . The core body 173 and the winding coil 121 form a stator that is an electromagnet.

  The conventional electric pump 110 is assembled in the following procedure, for example. First, the core body 173 is covered with the front insulator 133 and the rear insulator 134. Subsequently, the insulated conductor 120 is wound around the core body 173 insulated by the front insulator 133 and the rear insulator 134. At this time, the insulated conducting wire 120 inserts a jig from the rear to the front in the axial direction, and crawls from the inner side to the outer side in the radial direction. Subsequently, the stator core 107 formed with the electromagnet is press-fitted into the stator housing 102. Further, after the pump housing 103 is attached to the stator housing 102, the motor is electrically driven through steps such as insertion of the rotary shaft 8, attachment of the rear housing 104, attachment of the inner rotor 191, attachment of the outer rotor 195, and attachment of the pump lid 115. The pump is assembled.

There has been proposed a technique in which an outer rotor and an inner rotor, which are conventionally made of metal, are made of a thermosetting plastic reinforced with glass fiber for the purpose of cost reduction. It is described that such a configuration can provide a trochoid pump capable of reducing costs (for example, Patent Document 1).
Noto 3046977

  Here, as a means for reducing the weight of the conventional electric pump 110, for example, a method of forming the pump housing 103 or the like with a resin is conceivable. However, even when the resin is used in this way, it is used. Depending on the resin, it cannot always be said that the cost can be reduced, and the complicated assembly process cannot be simplified yet.

  Therefore, the present invention has been made in view of such circumstances, and can be reduced in weight, can be reduced in cost as compared with a conventional electric pump, and can further simplify the assembly process. The object is to supply an electric pump that can be used.

  An electric pump according to the present invention includes a core formed of a magnetic material and a winding coil wound around the core, an electromagnet used as a stator, the electromagnet, and the core and the winding An electric pump including an insulator that is interposed between the coil and the core and the winding coil, and a pump housing having a pump chamber for sucking and discharging liquid or gas. Further, the insulator and the pump housing are integrally formed.

  According to the above configuration, since the insulator and the pump housing are integrally formed, the number of parts can be reduced as compared with the conventional electric pump in which the insulator and the pump housing are separate members. Therefore, for example, by integrally forming the insulator and the pump housing using a lightweight material, the electric pump can be reduced in weight and cost can be reduced, and the assembly process can be simplified. It becomes possible to plan.

  In the electric pump according to the present invention, the insulator and the pump housing are preferably made of resin.

  According to the above configuration, since the insulator and the pump housing that are integrally formed are made of resin, they can be easily formed with a mold or the like. Therefore, the cost can be further reduced and the electric pump can be easily reduced in weight.

  In the electric pump according to the present invention, the pump chamber includes a rotor for discharging the pressurized liquid or gas by pressurization, and the rotor and the pump housing are formed of the same material. Further preferred.

  According to the above configuration, since the rotor is formed of the same material as the pump housing, the rotor has the same linear expansion coefficient with the pump housing, and the clearance between the rotor and the pump housing can be easily managed.

  According to the present invention, it is possible to reduce the weight and to supply an electric pump capable of reducing the cost as compared with the conventional electric pump and further simplifying the assembly process. it can.

  The structure of the electric pump according to this embodiment will be described below with reference to the drawings.

  As shown in FIG. 1, the housing 1 of the electric pump 10 according to the present embodiment has a shape in which both ends of a cylindrical stator housing 2 are sealed by a pump housing 3 integrated with an insulator and a substantially disc-shaped rear housing 4. It is. A stator core 7 is fitted in the stator housing 2. The stator core 7 has a cylindrical outer peripheral portion 71, and is equally spaced in the circumferential direction of the outer peripheral portion 71, and is inward in the radial direction from the inner peripheral surface 72 of the outer peripheral portion 71 (hereinafter referred to as inward). It has six core bodies 73 extended.

  The pump housing 3 that seals the front (hereinafter referred to as the front) in the axial direction of the stator housing 2 includes a bottomed cylindrical pump housing portion 31 and a front insulator extending rearward from the bottom portion 38 of the pump housing portion 31. 33 is a member formed integrally. The front of the stator housing 2 is sealed by the pump housing portion 31, and the front insulator 33 is put on the front end portions (hereinafter referred to as the front ends 74) of the six core bodies 73. On the other hand, a rear insulator 34 is put on a rear end portion (hereinafter referred to as a rear end 75) of the core body 73, and the rear of the stator housing 2 is sealed by the rear housing 4 as described above. The insulated conductor 20 is wound around each of the six core bodies 73 insulated by the front insulator 33 and the rear insulator 34, and the winding coil 21 having the magnetic flux direction directed radially inward is formed. . The core body 73 and the winding coil 21 form a stator that is an electromagnet.

  A bearing 35 and a bearing 45 are respectively fixed to the pump housing 3 and the rear housing 4, and the rotating shaft 8 is rotatably supported by the bearing 35 and the bearing 45. A rotor 81 formed of a permanent magnet is attached to a portion corresponding to the core body 73 as well as the outer peripheral surface of the rotating shaft 8. Further, the front end 82 of the rotary shaft 8 projects forward from the through hole 36 provided in the bottom 38 of the pump housing, and an external gear-shaped inner rotor 91 is fixed. On the other hand, since the outer peripheral surface 96 of the inner gear-shaped outer rotor 95 is fitted so as to be in sliding contact with the inner peripheral surface 37 of the pump housing portion 31, the outer teeth 92 of the inner rotor 91 and the inner teeth of the outer rotor 95. 97 mesh with each other. Further, the front opening portion of the pump housing portion 31 is sealed by the pump lid 15 having the suction port 11 and the discharge port 12 so that it is surrounded by the pump housing portion 31 and the pump lid 15, and the inner rotor 91 and the outer rotor 95. A pump chamber 39 is formed.

  Here, the material forming the stator housing 2 and the rear housing 4 is not particularly limited, but may be made of metal such as steel, aluminum, and stainless steel, for example. As a material for forming the stator core 7, for example, a magnetic material such as sintered metal is used. On the other hand, the material forming the pump housing 3, the pump lid 15, the inner rotor 91, and the outer rotor 95 is preferably made of resin.

  The electric pump 10 is assembled in the following procedure, for example.

  As shown in FIG. 2, the core body 73 is covered with a front insulator 33 and a rear insulator 34 that are integrally formed as the pump housing 3. Subsequently, the insulated conductor 20 is wound around the core body 73 insulated by the front insulator 33 and the rear insulator 34. At this time, since the insulated conducting wire 20 is inserted from the rear to the front in the axial direction not sealed, and is moved from the inner side to the outer side in the radial direction, the front in the axial direction is the pump housing of the pump housing 3. Even if it is sealed in the part 31, no particular problem occurs. Next, the stator housing 2 is attached. Since the pump housing 3 is already attached to the stator core 7, the work of attaching the pump housing 3 to the stator housing 2 at the same time that the stator core 7 is press-fitted into the stator housing 2 can be performed. it can. Thereafter, the electric pump 10 is assembled through steps such as insertion of the rotary shaft 8, attachment of the rear housing 4, attachment of the inner rotor 91, attachment of the outer rotor 95, attachment of the pump lid 15, and the like.

  According to the electric pump of the above embodiment, the following effects can be obtained.

  (1) According to the electric pump according to the above embodiment, since the front insulator 33 (insulator) and the pump housing portion 31 are integrally formed, the number of parts is reduced as compared to the conventional member that is a separate member. Contributes to cost reduction. In addition, since the stator housing 7 can be press-fitted into the stator housing 2 and the pump housing 3 can be attached to the stator housing 2 at the same time, the number of assembly steps can be reduced.

  (2) According to the electric pump according to the above embodiment, the pump housing portion 31 and the front insulator 33 are integrally formed of resin as the pump housing 3, and therefore can be easily formed with a mold or the like. Therefore, it contributes to cost reduction. Moreover, weight reduction becomes easy.

  (3) According to the electric pump according to the above embodiment, since the rotor is formed of the same material as the pump housing, that is, resin, the linear expansion coefficients of the rotor, particularly the outer rotor 95 and the pump housing 3 are equal, and the outer The clearance between the rotor 95 and the pump housing 3 can be easily managed.

  (4) Since the electric pump according to the above embodiment is an internal gear type electric pump, the inner rotor 91 and the outer rotor 95 are engaged with each other, and the outer rotor 95 and the pump housing 3 (the inner wall thereof) are in sliding contact. . On the other hand, since the inner rotor 91, the outer rotor 95, and the pump housing 3 are formed of the same material, the respective wear coefficients are equal, and any of them does not wear unilaterally. Therefore, there is no member with particularly weak wear strength, and durability is increased as compared with the case where at least one of the inner rotor 91, the outer rotor 95, and the pump housing 3 is formed of a different material.

  In addition, you may change the said embodiment as follows.

  -Although the electric pump concerning the said embodiment is an internal gear type electric pump, another structure may be sufficient. For example, even in the case of a centrifugal pump, by integrating the pump housing and the insulator, the cost can be reduced and the number of assembly steps can be reduced by reducing the number of parts.

  -In the electric pump concerning the said embodiment, although the inner rotor 91, the outer rotor 95, and the pump housing 3 are formed with the same raw material, another structure may be sufficient. For example, if the difference in friction coefficient does not become a problem, even if the inner rotor 91 and the outer rotor 95 are made of metal and the pump housing 3 is made of resin, the number of parts can be increased by integrating the pump housing and the insulator. As a result, the cost can be reduced and the assembly man-hours can be reduced.

  In the electric pump according to the above embodiment, the pump housing 3 in which the front insulator 33 and the pump housing portion 31 are integrally formed is formed of resin, but other configurations may be used. If strength, durability, and insulation are all satisfied, for example, ceramic may be used.

  -Although the electric pump concerning the said embodiment is an internal gear pump used for a liquid, especially oil etc., another structure may be sufficient. For example, a pump that sucks and discharges gas may be used.

  Next, technical ideas that can be grasped from the above-described embodiment and other examples will be described below together with their effects.

  (A) In the electric pump according to the present invention, the rotor is fixed to the rotating shaft and rotates along with the rotating shaft, and has an outer gear-shaped inner rotor and an internal gear shape. It is preferable that the outer rotor mesh with the outer teeth of the inner rotor and have an outer peripheral surface that is in sliding contact with the inner wall of the pump chamber.

  Therefore, according to the invention described in (a), the rotor is fixed to the rotating shaft and rotates along with the rotating shaft, and has an external gear-shaped inner rotor, an internal gear shape, and an internal gear. Is an electric pump comprising an outer rotor that meshes with the outer teeth of the inner rotor and whose outer peripheral surface is in sliding contact with the inner wall of the pump chamber. Therefore, the inner rotor and the outer rotor mesh with each other, and the outer rotor and the pump housing ) Is in sliding contact. On the other hand, since the inner rotor, the outer rotor, and the pump housing are formed of the same material, the respective wear coefficients are equal, and any of them does not wear unilaterally. Accordingly, there is no member with particularly low wear strength, and durability is increased as compared with the case where at least one of the inner rotor, the outer rotor, and the pump housing is formed of a different material.

  The present invention can be used as an electric pump that is particularly easy, lightweight, and low in assembly work.

It is drawing explaining one Embodiment of the electric pump concerning this invention, and is an axial sectional view. It is drawing explaining other one Embodiment of the electric pump concerning this invention, and is an axial direction end view in the state which attached the pump housing and the insulator to the stator core. It is drawing explaining the conventional electric pump, and is an axial sectional view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Stator housing, 3 ... Pump housing, 4 ... Rear housing, 7 ... Stator core, 8 ... Rotating shaft, 10 ... Electric pump, 11 ... Intake port, 12 ... Discharge port, 15 ... Pump lid, 20 ... Insulated lead wire, 21 ... Winding coil, 31 ... Pump housing part, 33 ... Front insulator, 34 ... Rear insulator, 35 ... Bearing, 36 ... Through-hole, 37 ... Inner peripheral surface, 38 ... Bottom, 39 ... Pump chamber, 45 DESCRIPTION OF SYMBOLS ... Bearing, 71 ... Outer peripheral part, 72 ... Inner peripheral surface, 73 ... Core main body, 74 ... Front end, 75 ... Rear end, 81 ... Rotor, 82 ... Front end, 91 ... Inner rotor, 92 ... External teeth, 95 ... Outer rotor, 96 ... outer peripheral surface, 97 ... inner teeth, 101 ... housing, 102 ... stator housing, 103 ... pump housing, 104 ... rear housing, 107 ... stator 110 ... Electric pump, 115 ... Pump lid, 120 ... Insulated conductor, 121 ... Wound coil, 133 ... Front insulator, 134 ... Rear insulator, 171 ... Outer peripheral portion, 172 ... Inner peripheral surface, 173 ... Core body, 174 ... front end, 175 ... rear end, 191 ... inner rotor, 195 ... outer rotor.

Claims (3)

An electromagnet including a core formed of a magnetic material and a winding coil wound around the core and used as a stator;
An insulator that is provided in the electromagnet and that insulates the core and the winding coil by being interposed between the core and the winding coil;
In an electric pump comprising a pump housing having a pump chamber for sucking and discharging liquid or gas,
The electric pump, wherein the insulator and the pump housing are integrally formed.   The electric pump according to claim 1, wherein the insulator and the pump housing are made of resin.   2. The pump chamber according to claim 1, wherein a rotor for discharging the pressurized liquid or gas by pressurizing is contained in the pump chamber, and the rotor and the pump housing are made of the same material. Item 3. The electric pump according to Item 2.

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