JPS61145383A - Fuel pump device with built-in motor - Google Patents

Abstract

PURPOSE:To reduce length of a fixed shaft supporting a pump, by providing a means, which engages with each of both rotors, in a coupling member, fitted to one of the opposed end parts in both fixed shafts of a motor and a rotor, and rotatably supporting the both rotors respectively to the separate fixed shaft. CONSTITUTION:A coupling member 29 made of synthetic resin is fitted to the free end part of a fixed shaft 24 in a rotor 27 of a motor. This member 29 protrusively provides in its end part, in a side appearing in a pump unit 6, a pair of protrusions 29b in the direction of an axial line to be fitted to a notch (not shown in the drawing) respectively provided in the diagonal position of a center hole of a rotor 17 rotatably supported to a rotary shaft 14 of the vane pump unit 6. The coupling member 29 provides in its other end part a pair of protrusions 29a to plunge into a hollow 30 respectively provided in the rotor 27. In this way, a fuel pump device, rotatably supporting the pump rotor 17 and the motor rotor 27 by the separate fixed shafts 14, 24, relaxes a condition of use of a bearing for these both rotary parts and enables the fixed shaft 14, supporting a pump, to be shortened while the expense of a hardening process to be reduced.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a fuel pump device for supplying fuel to an internal combustion engine, and in particular, a fuel pump device in which a motor and a fuel pump are disposed coaxially within the same casing. The present invention relates to a fuel pump device of the above type.

<Prior Art> Fuel pump devices for internal combustion engines can be divided into those that utilize part of the output of the internal combustion engine and those that utilize an external moving horn such as an electric motor. Fuel pump devices powered by electric motors have been increasingly used in recent years because their installation locations can be freely selected.

In this type of fuel pump device, the motor and pump share a common rotation axis in order to make the configuration compact. Therefore, its rotating shaft is relatively long,
It is difficult to align the motor and pump relative to each other, and the assembly process tends to become complicated.

Furthermore, although it is necessary to harden the surface of the rotating shaft, the entire long rotating shaft must be hardened, which increases manufacturing costs. Furthermore, since it is not possible to test the motor and pump separately, performance confirmation tests become complicated.
Easy to cause quality control problems.

<Problems to be Solved by the Invention> In view of these drawbacks of the prior art, the main object of the present invention is to provide a fuel pump device with a built-in motor that does not require a long rotating shaft. Another object of the present invention is to provide a fuel pump device that is improved so that the motor and pump can be tested separately.

According to the present invention, an object of the present invention is to provide a fuel pump device in which a motor and a fuel pump are disposed coaxially within the same casing. A rotor is rotatably supported on a first fixed shaft, a rotor of the motor is rotatably supported on a second fixed shaft, and the rotor is fitted onto at least one of the opposite ends of the fixed shafts. This is achieved by providing a fuel pump device characterized in that the joint member is provided with means for engaging with each of the two rotors.

<Operation> By rotatably supporting the pump rotor and the motor rotor by separate fixed shafts in this manner, the usage conditions of the bearings for these two rotating parts are relaxed. Furthermore, since the total length of the fixed shaft that supports the pump can be shortened, the cost required for hardening the pump can be reduced.

<Embodiments> Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 show a fuel pump device according to the invention. A cylindrical casing 1 with one end open
A fuel inlet pipe 2 is integrally provided at the right end in FIG. 1, and a retainer 3 for receiving a strainer (not shown) is fitted into the inlet pipe. An annular step 1a is provided on the inner circumferential surface of the casing 1 on the inlet pipe 2 side, and a partition wall 5 is fitted into the casing 1 via a sealing O-ring 4 so as to come into contact with the shoulder of the step. ing. A vane pump unit 6, which will be described later, is screwed onto the left side surface of wAAs2 in FIG. 1 with screws 7.

One end of a collar 8 forming a smoother contacts the outer peripheral edge of the left side surface of the partition wall 5 in FIG. 1, and one end of a stator core 10 having a solenoid 9 contacts the other end of the collar 8. This positions the vane pump unit 6 and stator core 10 in the axial direction.

A skirt portion 11b of a second partition wall 11 is in contact with the other end of the stator core 10, and a cover plate 13 is mounted on the outer surface of the partition wall 11.
The open end 1b of the casing 1 is caulked inwardly toward the outer surface of the cover plate 13, thereby fixing each component inside the casing 1.

A base end of a fixed shaft 14 of the vane pump unit 6 is tightly fitted into the center hole of a boss 5a provided at the center of the first partition wall 5, and a bushing 1 is attached to the end of the fixed shaft 14.
A rotor 17 of a vane pump unit 6 is rotatably fitted through the rotor 5. This rotor 17 is provided with 5 qA radial depressions 16 in which respective cylindrical roller vanes 18 are received. Rotor 17
is a circular inner hole 2Q of the stator 20 surrounding the rotor.
It is eccentrically received within a.

As shown in FIG. 2, the spacing W5 and the holding plate 19 defining the other side of the vane pump unit 6 each have an opening 21. formed by an arcuate slot.
23 are provided at diagonal positions. Therefore, like a known vane pump, as the rotor 17 rotates, the vane pump unit 6 opens into a pump chamber defined by the outer circumferential surface of the rotor 17, the inner circumferential surface of the inner hole 20a of the stator 20, and the roller vane 18. The fuel sucked in through the opening 21 is discharged through the opening 23 as the volume increases or decreases.

The second partition wall 11 is also provided with a boss 11a at its center, and the base end of the fixed shaft 24 is tightly fitted into the center hole of the boss. A rotor 27 is rotatably supported at the intermediate portion of the fixed shaft 24 via a pair of bushings 25 . A thrust washer 26 is sandwiched between the free end surface of the boss 11a and the opposing end surface of the rotor 27. A permanent magnet 28 is fixed to the outer periphery of the rotor 27, and this permanent magnet 28 is driven to rotate around the fixed shaft 24 in response to changes in the direction of excitation of the stator core 10.

A joint member 29 made of synthetic resin RM is fitted to the free end of the fixed shaft 24, and a pair of axial protrusions 29b protrudes from the end of the joint member 29 on the side facing the bomb unit 6. (FIG. 3), and are fitted into radial notches 22 provided at diagonal positions of the center hole of the rotor 17 of the vane pump unit 6, each of which receives the bushing 15.

A pair of axial protrusions 29 are also provided at the other end of the coupling member 29.
a (FIG. 3), each protruding into a recess 30 formed in the rotor 27.

Therefore, the rotor 17 of the vane pump unit 6 is driven to rotate as the rotor 27 of the motor unit rotates, and the fuel introduced from the inlet pipe 2 of the casing 1 is sucked into the vane pump unit 6 through the opening 21 and discharged through the opening 23. It will be discharged toward the empty space in the casing where the motor unit is located. When the discharge pressure becomes excessive, the relief valve body 33 biased by the compression coil spring 32 in the through hole of the partition wall 5 opens, and the discharge pressure of the vane pump unit 6 is released.

An outlet pipe 35 is tightly fitted through an O-ring 34 at a position offset radially outward from the axis of the second partition 11 . A valve body 37 similar to that described above is also supported in the through hole of the outlet pipe 35 by a compression coil spring 36, and this valve body 37 is opened when the discharge pressure of the vane pump unit 6 exceeds a certain value. Then, the internal combustion ei is discharged from the outlet pipe 35.
Fuel will be sent to the +i carburetor or the like.

In the space obtained in the partition wall 11 by offsetting the outlet pipe 35, a boss 11c is integrally formed on the partition wall 11 so as to protrude outward from the opening 13a of the cover plate 13, and a solenoid is installed in the boss. A pin 38 internally connected to 9 is fixed and forms a connector to be connected to a power source (not shown).

Effect> As described above, according to the present invention, both the central axis of the pump unit and the central axis of the motor unit are fixed shafts,
Since the rotor 17 of the pump and the rotor 27 of the motor are rotatably supported on these fixed shafts, the usage conditions for the bearings of these two rotating members are relaxed. In particular, the central shaft of the pump must be finished with high precision so that the pump can exhibit the required performance, and the surface must be hardened.According to the present invention, the central shaft of the pump Since it is extremely short, the cost required for its curing process is low.

Furthermore, the rotor of the pump unit and the motor unit may be made of a flexible member.
9, even if there is a slight misalignment of the axes of the motor unit and the pump unit, the operation thereof will not be hindered, and therefore manufacturing thereof is facilitated.

In addition, since the central axes of the motor unit and pump unit are separate from each other, it is easier to assemble the rotor and stator of the pump unit, which have a particularly important effect on performance, and it is easier to assemble the rotor and stator. Since they can be operated separately, the motor unit test and the pump unit test can be performed independently, making it easier to perform performance confirmation tests to ensure stable quality. It also has a big effect on the top.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the entire fuel pump device according to the present invention. FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1. FIG. 3 is an enlarged perspective view of the joint member used in the embodiment of FIG. 1. 1...Casing 1a...Step 1b...Open end 2...Inlet pipe 3...Retainer
4... O-ring 5... Partition wall 5a...
Boss 6... Vane pump unit 7... Screw 8... Collar 9... Solenoid 10... Stator core 11... Partition wall
11a...Boss 11b...Skirt part 1
1 c-... Boss 12... O-ring 13...
Lid plate 13a...Opening 14...Fixed shaft 15.
... Bushing 16 ... Recess 17 ... Rotor
18... Vane roller 19... Holding plate
20... Stator 20a... Inner hole 21.
...Opening 22...Notch 23...Opening 24
... Fixed shaft 25 ... Bushing 26 ...
Thrust washer 27...0-Yu 28...Permanent magnet 29...
・Joint members 29a, 29b...Protrusion 30...
Recess 32... Compression coil spring 33... Valve body 34... O-ring 35... Outlet pipe
36... Compression coil spring 37... Valve body
38...Bin patent applicant Honda Motor Co., Ltd. representative Patent attorney
Yo Oshima - 2nd vA η 3rd E

Claims (1)

[Claims] A fuel pump device in which a motor and a fuel pump are coaxially arranged in the same casing, the rotor of the fuel pump is rotatably supported on a first fixed shaft, and the rotor of the motor is supported on a second fixed shaft. A joint member rotatably supported by a fixed shaft and fitted to at least one of opposing ends of the fixed shafts is provided with means for engaging with each of the rotors. Fuel pump equipment.