JPH0759953B2 - Pump device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a pump device.

[0002]

2. Description of the Related Art A conventional pump apparatus has a vertical cross-sectional view shown in FIG. 1, in which a motor is incorporated in a cylindrical housing 104 whose inner surface is straight, and a pump casing 21 and a bearing holder. Since there is no axial holding of 67, it is necessary to insert another component 107 between them and fix them axially at both ends 105 and 106, increasing the number of components and increasing the cost. There was a drawback.

Further, as another conventional example, as shown in the longitudinal sectional view of FIG. 2, both inner ends of a cylindrical housing 104 are simply cut so that the central inner diameter of the housing 104 corresponds to that of the pump casing 21 and the bearing holder 67. In the case where the pump casing 21 and the bearing holder 67 are fixed in the radial direction inside both ends 100 and 101 of the housing 104 and axially fixed by the step portions 120 and 121, as shown in FIG. Separate part 107 as in the conventional example
However, the reference surfaces of the pump casing 21 and the bearing holder 67 are different, and in order to reduce the axial misalignment of both bearings 82 and 28, it is necessary to process the concentricity of both reference surfaces with high accuracy. There was a drawback.

Furthermore, as disclosed in Japanese Patent Laid-Open No. 57-176352, the inside of the housing is
It is known that a medium inner diameter portion located on both sides thereof and a large inner diameter portion located on both sides thereof are formed in three stages, and a bearing holder and a pump casing are provided on the middle inner diameter portion and the large inner diameter portion. ing. This Japanese Patent Application Laid-Open No. 57-1763
According to the pump device disclosed in Japanese Unexamined Patent Publication No. 52-52, the bearing holder and the pump casing can be axially positioned by the step of the housing, but the bearing holder and the pump casing are provided on different inner peripheral surfaces of the housing. However, there is a drawback in that high precision machining is required to reduce the misalignment of the shaft supported by these.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art as described above, and an object thereof is to provide a high-performance pump device at a low cost. The side wall members provided can be positioned, and with a simple structure and relatively easy processing, axial misalignment of the shaft of the motor supported by these side wall members can be reduced. An object of the present invention is to provide a pump device in which the side wall members are easily fixed to both ends.

[0006]

In order to achieve the above object, the present invention comprises a cylindrical housing (10) and two side wall members (21, 67) provided at both ends of the housing, respectively. A shaft (25) provided in the housing and supported at both ends by the side wall member, a stator (61) provided in the housing and forming a part of a motor (16), and the shaft A pump (15) provided in the housing and constituting a part of a motor, and a pump portion (15) provided in the housing and rotationally driven by the rotor. ) Is a radial reference part (110, 110) formed on the inside of the housing and having a continuous cylindrical surface with the same inner diameter.
111) and two thin portions (thicknesses smaller than the radial reference portion) formed by cutting the inside of the housing to an inner diameter larger than the radial reference portion over a predetermined length from both ends of the housing (111). 14, 18), and each of the side wall members (21, 67) has a small diameter portion having an outer peripheral surface in contact with the radial reference portion of the housing, and an outer diameter larger than the outer peripheral surface. A large diameter portion located inside the thin portion of the housing, and the side wall members (21, 67) are fixed to both sides of the housing by bending the thin portions at both ends of the housing to the inner diameter side. The technical means of being adopted is adopted.

[0007]

According to the above-described structure of the present invention, the side wall members are provided on the one end side and the other end side of the housing, respectively. Then, at each end of the housing, the outer peripheral surface of the small diameter portion of the side wall member contacts the radial reference portion of the housing,
The large-diameter portion of the sidewall member is located in the thin portion formed by cutting on both sides of the radial reference portion of the housing. Since the outer diameter of the large diameter portion of the side wall member is larger than the inner diameter of the radial reference portion of the housing, the large diameter portion of the side wall member does not enter the radial reference portion of the housing. Positioned axially.

Further, the side wall members provided at both ends of the housing are brought into contact with the radial reference portion of the housing on the outer peripheral surface of the small diameter portion to be positioned in the radial direction, and the radial reference portion is located inside the housing. Since they are formed with the same continuous inner diameter, the radial positioning of the side wall members at both ends is performed by the common radial reference portion, and the misalignment of the shaft supported by the side wall members at both ends is reduced.

Further, since the thin portions are formed at both ends of the housing by cutting, it is easy to bend both ends of the housing when fixing the side wall members at both ends.
As described above, in the configuration of the present invention, a thin portion is formed inside the housing by cutting, and by utilizing this,
The side wall members provided at both ends of the housing can be easily and accurately positioned in the axial direction and the radial direction, the axial misalignment can be reduced, and the side wall member can be easily fixed by the thin portion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a vertical cross-sectional view showing the configuration of an embodiment of the pump device according to the present invention (fuel supply pump device for automobile), and FIG. 4 is a vertical cross-sectional view taken along the line AA of FIG. Reference numeral 10 denotes a cylindrical housing, and steps 11 are formed at both inner ends thereof.
2, 113 are provided. Further, the steps 112, 1 of the housing are also provided on the outer peripheral side of the bearing holder 67 that supports the bearing 82 and the pump casing 21 that supports the bearing 28.
13 to form a step for fitting with the bearing holder 6
7 and pump casing 21 are press-fitted inside the housing at radial reference portions 110 and 111 in the same cylinder inside the housing 10, respectively. That is, in each of the bearing holder 67 and the pump casing 21,
A small-diameter portion that comes into contact with the radial reference portions 110 and 111 of the housing and a large-diameter portion whose outer diameter is larger than the small-diameter portion are formed, and the step between the small-diameter portion and the large-diameter portion is the step 1 of the housing.
The bearings 67 and the pump casing 21 are brought into contact with the bearings 12, 113 to determine axial positions of the bearing holder 67 and the pump casing 21. And
As shown in FIG. 3, the large diameter portion and the housing end portions 1
There is a gap between 4, and 18. Since the inner diameters of both end portions 14 and 18 and the outer diameter of the large diameter portion are formed in such a size that this gap is formed, the radial reference portions 110 and 111 and the small diameter portion can be reliably positioned. The bearing holder 67 and the pump casing 21 are fixed by caulking both ends 14 and 18 of the housing, which are thin-walled portions thinned by cutting the inside of the housing.

The pump device further includes a regenerative pump portion 15 provided in the housing in contact with the caulking portion 18 on the opening 11 side of the housing 10, and a motor provided in the housing 10 adjacent to the regenerative pump portion. 16 and
The motor 16 is adapted to drive the pump section which is operatively connected to the regeneration pump section 15.

The pump chamber has a recess portion 24 of the pump casing 21 having a casing portion 58 and a recess portion 1 of the pump cover 17.
3 and their peripheral portions 91. The shaft 25 has an axis extending in a coaxial relationship with the arcuate recesses 13 and 24. One end 26 in the axial direction of the shaft 25
Is rotatably supported by a bearing 28 in an axial center hole (bearing surface) 27 provided in the pump casing 21. One end 26 in the axial direction of the shaft 25 penetrates the pump chamber and has an axial end face located in the space 43 in the central recess 31 formed in the inner surface 22 of the pump cover 17.

The generally disk-shaped impeller 32 has a diameter φ of 40 mm and an axial thickness t of 2.8 mm, and is mounted on the shaft 25 so as to be rotatable in the pump chamber. The impeller 32 has an axial center hole 33 (FIG. 4) into which the axial end portion 26 of the shaft 25 is fitted, and a wall surface of the central hole 33 is provided with a pair of diametrically opposed axial grooves 34. Has been formed. A pin 36 having a circular cross section extends through the shaft 25 and also has ends which are respectively fitted in the pair of axial grooves 34. 44 is an impeller 32 and a bearing 28
It is a space between and.

Thus, the impeller 32 is mounted on the shaft 25 so as to be movable axially relative to the shaft 25 but not rotatable relative to the shaft 25. The impeller 32 has an outer peripheral portion that cooperates with a pump chamber defined in the pump cover 17 and the pump casing 21 to define an arcuate pump flow passage 46, and the outer peripheral portion has one axial end surface 38 and the other. On the end face 39, a plurality of radial vane grooves 47 are formed at equal intervals in the circumferential direction of the impeller 32 and are separated from each other. In the impeller 32 shown in FIG. 4, the bottom surface of the blade groove 47 formed on the one axial end surface 38 and the bottom surface of the blade groove 47 formed on the other axial end surface 39 do not intersect each other. It is a so-called closed-wing type. W1 is the inner surface 22 and one end surface 3 of the impeller.
8 is the clearance between the second end surface 39 and the inner surface 19
Is the clearance between.

The electric motor portion 16 has a concentric circle relationship with the shaft 25 and is disposed in the housing 10 so as to have two approximately semi-cylindrical permanent magnets 61 and a concentric circle relationship with the permanent magnet 61 and is fixed to the shaft 25. Armature 62 attached by
It has a commutator 63 connected to the armature 62 and fixed to the shaft 25. A brush 64 is in sliding contact with the commutator 63. The brush 64 is held by a brush holder 66 fixed to a bearing holder 67. The bearing holder 67 is arranged in the housing 10 so as to substantially close the opening 12 surrounded by the other axial end portion 14 of the housing 10.

The bearing holder 67 is a central recess 71 formed on one axial end surface facing the inner space of the housing 10.
And the second central concave portion 7 formed on the bottom surface of the central concave portion
Have two. A plurality of grooves 73 are formed on the wall surface of the second recess 72 so as to be separated from each other in the circumferential direction, and the groove 73 has an inclined bottom surface and the central recess 71.
Has an open end on the bottom surface. Bearing holder 6
7 has a hollow projecting portion 74 projecting outward from the other axial end surface thereof, and the hollow portion of the hollow projecting portion 74 communicates with the second recess 72. The hollow protrusion 74 is adapted to be connected to a fuel injection device (not shown).

The other axial end portion 81 of the shaft 25 is rotatably supported by a bearing 82. The bearing 82 is seated on a seat 83 formed by chamfering the second concave portion 72 and the central concave portion 71. It is held in place by an annular retainer 85 deployed in the. The retainer 85 has a plurality of holes 86 formed so as to be separated from each other in the circumferential direction. The shaft 25 is held at a predetermined radial position by an annular retainer 85. The shaft 25 comes into contact with one end face in the axial direction of the bearing 82 and a spacer 87 attached to the shaft 25 and comes into contact with one end face in the axial direction of the bearing 28 and a spacer 88 attached to the shaft 25 makes a predetermined position in the axial direction. It is designed to be held at.

The material of the pump casing 21 is aluminum, the material of the bearing holder 67 is synthetic resin, and the housing 10 is iron. Further, in order to improve the accuracy of the inner diameter of the housing 10, the inner diameter is sized. After sizing, the inner diameter of both ends of the housing is cut to obtain steps 112, 1
13 is formed.

As for the assembling order, the pump casing 21 is pressed into the housing 10, the armature 62 and the bearing holder 67 are then assembled, and the bearing holder 67 is pressed into the housing 10. After that, the impeller 32 is attached, the pump cover 17 is attached, and both ends 1 of the housing are attached.
Crimp 4,18.

The operation of the pump device described above will be described. An electric current from a power source (not shown) is supplied to the commutator 63 through the brush 64 to rotate the armature 62. The rotation of the armature 62 is transmitted to the impeller 32 by the shaft 25 and causes the impeller to rotate.

The rotation of the impeller 32 allows the liquid fuel to be introduced into the pump passage 46 from the suction port 51. The fuel is pressurized in the pump flow path 46 by the blade grooves 47 of the impeller 32, is discharged into the internal space of the housing 10 through the discharge port 52, and is provided in the annular gap between the permanent magnet 61 and the armature 62, and the retainer 85. Hole 86, groove 73 provided in bearing holder 67 and hollow protrusion 74
Is sent to the fuel injection device through the hollow portion of.

[0022]

As described above, according to the present invention, the side wall members provided at both ends of the housing can be easily and accurately positioned in the axial direction and the radial direction by a simple structure and relatively easy processing. The misalignment can be reduced, and the side wall members provided at both ends of the housing can be more easily fixed, so that a high-performance pump device with less friction loss can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional pump device.

FIG. 2 is a vertical sectional view of a conventional pump device.

FIG. 3 is a vertical sectional view showing the configuration of an embodiment of the pump device according to the present invention.

4 is a vertical cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 10 Housing 16 Motor Section 67 Bearing Holder 21 Pump Casing 82, 28 Bearing 110, 111 Radial Reference Section 112, 113 Step 14, 18 Housing Both Ends (Thin Section)

Claims (1)

[Claims] Cylindrical housing (10) and two side wall members (21, 67) provided on both ends of the housing, respectively.
A shaft (25) provided in the housing and supported at both ends by the side wall member; a stator (61) provided in the housing and forming a part of a motor (16); A pump device comprising a rotor (62) provided on a shaft and forming a part of a motor, and a pump section (15) provided in the housing and rotationally driven by the rotor, wherein the housing ( 10) is
A radial reference portion (110, 111) formed on the inside of the housing and having a continuous cylindrical surface having the same inner diameter, and a predetermined length from both ends of the housing,
The thin wall portion (14, 18) formed by cutting the inside of the housing to have an inner diameter larger than the radial reference portion, and having a thickness smaller than that of the radial reference portion, the sidewall member (21, 67) each include a small-diameter portion having an outer peripheral surface in contact with the radial reference portion of the housing and a large-diameter portion having an outer diameter larger than that of the outer peripheral surface and located inside the thin-walled portion of the housing. The side wall member (2
1, 67), wherein thin-walled portions at both ends of the housing are bent toward the inner diameter side and fixed to both sides of the housing, respectively.