JPS59150995A - Pumping device - Google Patents

Abstract

PURPOSE:To make high accuracy working for the purpose of preventing increase of the number of parts as well as reducing the deviation of axial center, unnecessary by a method wherein the radial direction reference part in the same cylinder at the inside of a housing is utilized as the radial direction reference of a holder bearing and a casing pump, which are supporting both of bearings respectively. CONSTITUTION:The radial direction reference parts 110, 111 of the same cylinder at the inside of the housing 10 are utilized as the radial direction reference of the holder bearing 67, supporting the bearing 82, and the casing pump 21, supporting the bearing 28 respectively. The end parts of the inside of the housing are formed with steps 112, 113 and the outer peripheries of said holder bearing 67 and the casing pump 21 are formed with steps to engage with the steps 112, 113 of the housing 10. According to such constitution, the high accuracy working, for the purpose of preventing the increase of the number of parts as well as contriving the reduction of deviations of the axial centers of bearings 82, 28, may be made unnecessary.

Description

[Detailed description of the invention] The present invention relates to the structure of a pump device.

The conventional pump device, as shown in the vertical cross-sectional view in FIG. Since there is no presser foot, it is necessary to insert another part 107 between the two for fixation in the axial direction, which has the drawback of increasing the number of parts and increasing costs.

As another conventional example, as shown in a vertical cross-sectional view in FIG. If the casing pump 21 and the holder bearing 67 are fixed in the radial direction inside both ends of the housing 104, the separate part 107 as in the conventional example shown in FIG. 21 and the holder bearing 67, and in order to reduce the misalignment of both bearings 82 and 28, the concentricity of both reference surfaces must be machined with high precision.

Furthermore, if the machining accuracy of the concentricity of both reference surfaces is low, it is necessary to correct the misalignment of the axes by using an alignment bearing as shown in FIG.

In view of the above points, it is an object of the present invention to provide a pump device that does not increase the number of parts and does not require high-precision machining.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described. Third
The figure is a longitudinal sectional view showing the configuration of an embodiment of the pump device (fuel supply pump device for automobiles) according to the present invention, and FIG. 4 is a longitudinal sectional view taken along the line A-A shown in FIG. 3. 10 is a cylindrical housing with steps 112.1 at both inner ends thereof.
13 are provided. In addition, the holder bearing 67 that supports the bearing 82 and the casing pump 2 that supports the bearing 28 are also provided.
1 is also formed on the outer circumferential side of the housing 10, and the holder bearing 67 and the casing pump 21 are located inside the housing 10 at the radial reference portions 110 and 111 within the same cylinder. is press-fitted into the The holder bearing 67 and the casing pump 21 are fixed by caulking both housing ends 14.1B.

The pump device further includes a regeneration pump section 15 disposed within the housing in contact with the caulking portion 18 of the housing 10, and a motor 16 disposed within the housing 10 adjacent to the regeneration pump section. Motor 16 is operatively connected to regeneration pump section 15 to drive the pump section.

The pump chamber is defined by the recess 24 of the casing pump 21 and the recess 13 of the cover pump 17.

The shaft 25 has an axis extending coaxially with the arcuate recesses 13 and 24. One end 26 in the axis 1 direction of the shaft 25 is rotatably supported by a bearing 28 in an axial center hole 27 provided in the casing pump 21 . One axial end 26 of the shaft 25 extends through the pump chamber and has an axial end face located within a central recess 31 formed in the inner surface 22 of the cover pump 17 .

The impeller 32, which is approximately disk-shaped, has a diameter φ of 40 mm and an axial thickness t of 2.8 mm, and is bonded to the shaft 25 so as to be rotatable within the pump chamber. The impeller 32 is the shaft 25
an axial center hole 3 into which one axial end 26 of the
3 (FIG. 4), and a pair of axial grooves 34 diametrically opposed to each other are formed in the wall surface of the central hole 33. A bottle 36 having a circular cross section extends through the shaft 25 and has ends that fit into a pair of axial grooves 34, respectively.

The impeller 32 is thus mounted on the shaft 25 for axial movement but not for rotation relative to the shaft 25. The impeller 32 is the cover pump 1
7 and a pump chamber defined in the casing pump 21 to define an arc-shaped pump flow path 46, and the outer circumference has one axial end surface 38 and the other end surface 39.
A plurality of radial blade grooves 47 are formed at equal intervals in the circumferential direction of the impeller 32.

The illustrated impeller 32 has one axial end surface 3
The blade groove 47 has a so-called closed blade shape in which the bottom surface of the blade groove 47 formed in the blade groove 8 and the bottom surface of the blade groove 47 formed in the other end surface 39 in the axial direction do not intersect with each other.

The electric motor section 16 is disposed within the housing 10 in concentric relationship with the shaft 25 and includes two approximately semi-cylindrical permanent magnets 61.
and a shaft 25 in a concentric relationship with the permanent magnet 61.
It has an armature armature 2 fixedly attached to the armature 2, and a commutator 63 connected to the armature 62 and fixed to the shaft 25. Brush 6 for commutator 63
4 are in sliding contact. The brush 64 is held by a brush holder 66 fixed to a holder bearing 67. The holder bearing 67 is arranged within the housing to substantially close the opening 12 in the other axial end wall 14 of the housing 10.

The holder bearing 67 has a central recess 71 formed on one end surface in the axial direction facing the inner space of the housing 10 and a second central recess 72 formed on the bottom surface of the central recess. A plurality of grooves 73 are formed on the wall surface of the second recess 72 and are spaced apart from each other in the circumferential direction, and the grooves 73 have an inclined bottom surface and an end that opens into the bottom surface of the central recess 71. are doing. The holder bearing 67 has a hollow protrusion 74 that protrudes outward from the other end surface in the axial direction, and the hollow part of the hollow protrusion 74 communicates with the second recess 72 . The hollow protrusion 74 is connected to a fuel injection device 2 (not shown).

The other end 81 in the axial direction of the shaft 25 is rotatably supported by a bearing 82 , and the bearing 82 is seated on a seat 83 formed by chamfering the second recess 72 .
It is held in place by an annular retainer 85 disposed at C. The retainer 85 has a plurality of holes 86 formed spaced apart from each other in the circumferential direction. The shaft 25 is held in a predetermined radial position by an annular retainer 85. The shaft 25 is held at a predetermined position in the axial direction by a spacer 87 attached to the shaft 25 in contact with one end surface in the axial direction of the bearing 82 and a spacer 88 attached to the shaft 25 in contact with one end surface in the axial direction of the bearing 28. It is designed to be held in

The material of the casing pump 21 is Al, the material of the holder bearing 67 is PAC, and the material of the housing 10 is Fe. Further, in order to improve the accuracy of the inner diameter of the housing 10, sizing processing is performed on the inner diameter. After the sizing process, the inner diameter of both ends of the housing is cut to form steps 112 and 113.

As for the assembly order, casing pump 21 is installed in housing lO.
After that, the armature 62 and holder bearing 67 are assembled, and the holder bearing 67 is attached to the housing 10.
Press fit into. Thereafter, the impeller 32 is assembled, the cover pump 17 is assembled, and both ends 14.18 of the housing are caulked.

The operation of the pump device described above will be explained.

Current from a power source (not shown) is supplied to the commutator 63 through the brush 64 to rotate the armchair 2. The rotation of the armature 62 is caused by the shaft 25 of the impeller 3.
2 and rotates the impeller.

As the impeller 32 rotates, liquid fuel is introduced from the suction port 51 into the pump channel 46 . The fuel is pressurized in the pump channel 46 by the blade grooves 47 of the impeller 32, and then
2 into the internal space of the housing lO, and the annular gap between the permanent magnet 61 and the armature 62, the retainer 8
The fuel is sent to the fuel injection device Z through the hole 86 provided in the fuel injection device Z, the groove 73 provided in the holder bearing 67, and the hollow part of the hollow protrusion 74.

As described above, in the pump device according to the present invention, the pump unit and the motor for driving the pump unit are housed in one housing. Bearing 8
The holder bearing 67 that supports the holder bearing 67 and the casing pump 21 that support the bearing 28 are the radial reference of the casing pump 21, and steps 112 and 113 are formed at both ends of the inner side of the housing, and the steps 112 and 113 of the housing are formed on the outer peripheral sides of the holder bearing 67 and the casing pump 21. Since steps are formed to fit with 112 and 113, there is no need to increase the number of parts, and there is no need for high-precision machining to reduce the misalignment of the bearings 82 and 28. The effect is great.

[Brief explanation of the drawing]

1 and 2 are vertical cross-sectional views of a conventional pump device, FIG. 3 is a vertical cross-sectional view showing the configuration of an embodiment of the pump device according to the present invention, and FIG. 4 is a vertical cross-sectional view of a conventional pump device. It is a longitudinal cross-sectional view taken along line A, and the same reference numerals indicate the same or equivalent parts in the figure. 10...Housing, 16...Motor part, 67.
...Holder bearing, 21...Casing pump,
82.28...Bearing, 110.111...Longitudinal reference part. 112.113...step. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] In a pump device in which a pump part and a motor for driving the pump part are housed in one housing, a longitudinal reference part (11O1111) in the same cylinder inside the housing is a holder bearing (67) that supports a bearing (82), and a holder bearing (67) that supports a bearing (82), respectively. As a longitudinal reference of the casing pump (21) that supports the bearing (28), there are steps (112, 113) at both ends inside the housing.
), and steps are formed on the outer peripheral sides of the holder bearing (67) and the casing pump (21), respectively, to fit with the steps (112, 113) of the housing.