JPS5859359A - Rotary volumetric type fuel pump for automobile - Google Patents

Abstract

PURPOSE:To prevent the corrosion of a motor due to the leakage of a fuel and to prevent the leaking fuel from ignition by a method wherein in the case of roller vane pump, a magnetized rotor which is supported by a projection extending from a partition wall and whose surface is treated by a nitriding process is driven by a magnetic member fixed to the output shaft of the motor through the partition wall. CONSTITUTION:The disk-shaped magnetic member 1b made of a ferrite magnet or an alnico magnet is fitted on the top end of the output shaft 1a of the motor so as to extend normal to the output shaft 1a and is magnetized to a single pole or a plurality of poles. The rotor 4 is made of high carbon steel whose surface is treated by a nitriding process and is magnetized to a single pole or a plurality of poles in the circumferential direction. When the magnetic member 1b on the top of the output shaft 1a of the motor is rotated with the rotation of the motor, the magnetized rotor 4 which is rotatably supported by the pump case projection 2a rotates due to its magnetic force in accordance with the magnetic force of the magnetic member 1b and as a result, the fuel is supplied from a fuel intake throughhole 6d to a fuel discharge throughhole 6f.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a relatively small rotary liquid pump to be applied to an automobile fuel pump, and particularly a bottle roller type rotary customer displacement pump (1: J lower vane, (referred to as a pump).

A conventional vane pump of this type is shown in FIG. That is, in Fig. 1, (1) is the electric armature that drives the pump, (1a) is the output shaft of the W411 child (1), and (2) is the pump base, one end of which is the flat wall of the pump chamber. (2C) and has a guide hole Ib) for discharge. (8a) is a pouf kit, on which (2) a brush (not shown) etc. for electrically feeding power is attached, and a bearing (8) supporting the output shaft (la) is not fitted. (4) is the rotor,
When fitted onto the output shaft (la), it has a plurality of through grooves (4a) that open toward the outer periphery and are equally spaced.

(6) are rollers that are movably inserted into the through grooves (4&) of the rotor (4), (6) are bomb housing 5 rings that form the circular side wall of the pump chamber; )
At the same time, attach the rotor (4) to the rotor (if the rotating tooth is present, make the center of the inner diameter of the C output shaft (Xa) eccentric from the center as shown in Fig. 2, and attach the eccentric body) to the rotor (4). radius of 0
It is manufactured with a radius of A+R+α that is slightly larger than the sum of A+R+α. And the dough is a guide groove for suction (
6a), discharge guide groove (s'b), discharge guide hole (6
C) and a hose connection port (6e) having a through hole (6d) that communicates with the suction guide groove (6a) and serves as a suction port. (γ) is a pump case, and (8) is a cylindrical metal case housing a pump device, to which a discharge pipe aI having a discharge port (9) is fixed via a packing 01). Q21.03), (b), ni) and ocn are 0 rings for maintaining sword tightness.

The operation of the vane pump configured in this way will be explained. That is, when power is supplied to the electric paddle (1) of the electric motor, as the output shaft (la) rotates, the rotor (4) fitted to the output shaft (1a) is rotated counterclockwise. The roller (
5) is also rotated counterclockwise by centrifugal force while contacting the inner peripheral surface of the pump howling (6). Here the rotor (4
) The state of change in the pump chamber with respect to the loaf (5) will be explained in detail as the loaf (5) rotates. For example, as shown in Figure 2, a roller (
When Is) is started from the inner circumferential surface (6f) of the pump housing (6), the space in the pump chamber gradually expands, and with kneading, a negative pressure is generated in the space and gradually increases. For this reason, the furnace is removed from the through hole (6d), which serves as a suction port and communicates with the suction guide and inner groove (6a). When the rotor (4) is further rotated, the space in the pump chamber gradually becomes narrower, bordering on the inner peripheral surface (6g) of the pump housing (6), and the above-mentioned combustion chamber gradually becomes narrower (pressurization, discharge guide). When it reaches the groove (60), it looks like the arrow &: Electric transport case (
8) and is discharged from the discharge port (9), where a well-known pump action is performed.

In the conventional vane pump configured as described above,
Since the P size is discharged from the pump chamber through the electric arm, it has a notch like a cutout.

(2) Since the fuel leaks into the electric motor part, there is a problem of corrosion of the metals that make up the electric motor parts or deterioration of synthetic resins due to the fuel, and therefore it is necessary to use special materials or treatments. be.

(b) Since flammable and explosive molten metal flows into the electric motor, there is no risk of ignition or explosion in the electric motor.

(C) It is necessary to use a large number of O-rings between the w-movement W1 section and the pump chamber to prevent fluid (fuel) leakage.

口) If a problem occurs in the pump chamber, it is difficult to replace only the pump chamber.

(e) [lj+ai+ output shaft (1&) and rotor (4
) and the pump housing (6), if the surface angles are not precise, there will be a problem of wear between them, so great care must be taken during assembly.

(6) In the unlikely event that an abnormality occurs in the pump chamber and the rotor (4) becomes stuck, damage to the electric motor is unlikely.

The present invention provides a rotary positive displacement pump having a structure that overcomes the deficiencies of the conventional pumps as described above. Below, one embodiment of this invention will be explained with reference to the drawings. In Figs. 8 and 4, (1) is electric-like itr, p-child, (
ta) is the pressure axis of electric machine f (11), (lb) is the disc magnet body, and the output axis (la) of 'it jilt ff'
The output shaft is fitted to the tip of the output shaft in the vertical direction, and the output shaft is fitted in the circumferential direction. It is magnetized to j/l pole. This magnet body (lb) is made of a magnetic material such as a ferrite magnet or an alnico magnet. (2) is a pump base, which has a base protrusion (2a) on one end surface for supporting the rotor (4). (8) is the output shaft (la)
This is a bearing for supporting the bracket (8a) and is fixed to the bracket (8a). (4) is the rotor, and the pace protrusion (2
A) is rotatably supported on a), is open toward the outer periphery, and is divided into equal parts aCIfl.'through*(4a)
has.

The rotor (4) is made of high carbon steel with a nitrided surface, and has a single pole or collar in the circumferential direction. # It is magnetized to the pole. Since the high carbon steel material whose surface has been subjected to nitriding treatment is used, the abrasive body can be produced at low cost, yet has a structure with excellent wear resistance and corrosion resistance. Note that the same effect can be obtained even if the high-grade steel is the next-grade tool-1 high carbon chromium bearing steel. (5) is a rotor (6) which is movably inserted into each through groove (4a) of the rotor (4).
) is the pump forming the circular wall of the pump chamber,
In the housing, the rotor (4) together with the loaf (5) is rotatably supported on the pace projection (2a), and as shown in FIG.
2), and the radius is slightly larger than the sum of the radius 0 of the rotor (41).The stiffness is caused by the suction guide groove (
Sa), discharge guide #II (61)), discharge guide hole (6c), suction through hole (6d), suction hose connection port (6e), discharge through hole (6f), and discharge It has a hose connection port (mg) and is in trouble. (7) is a pump case, and (8) is a cylindrical metal case containing 111r1114f. The connection C between the metal case 7 (8) and the pump pace (2) does not require the use of O-rings (B)), (B), and (B) as in the conventional example (Fig. 1), and is normally (B) and (I6) are O-rings for tight retention.

The operation of the vane pump configured in this way is such that when the magnet body (t'b) at the tip of the output shaft (la) of the electric motor is rotated by the electric motor, the movement of the magnetic force of the magnet body (lb) occurs. ,
A magnetic rotor (41) rotatably supported on the pump pace protrusion (2a) rotates through magnetic force. Once the rotor (4) rotates, it operates in the same manner as the conventional example, and the suction through hole (6d) to the discharge through hole (6f), where the pump action is performed.In order to perform the above operation more smoothly, the material of the pump pace (2) and pump housing (6) is For this purpose, non-resistant materials such as plastic, aluminum, zinc, which have excellent wear resistance and corrosion resistance, or non-magnetic stainless steel and surface treated materials are used.

The vane pump according to the present invention has a number of superior effects as compared to the conventional example since the fuel passes only through the pump chamber and does not flow into the electric paddle section.

Since the C size does not flow into the oak part of Seal 111, there is no corrosion of the metal that is the component material of the electric type, or the excellent work of synthetic resin. There is no need for special materials or treatments for the format.
A particularly advantageous structure is obtained when Gunnar, which is a mixture of gasoline and alcohol, is used as I4.

CF) 1 l Because the smoke mark is not included in the 11th section of IEII,
Electric rabbit! There is no risk of ignition or explosion inside the paddle (metal case).

(Insert an O-ring between the cl N W
There is no need to use )).

(d) If a problem occurs in the pump section, it is easy to replace only the pump chamber.

(e) Since the pump base protrusion (2a) that rotatably supports the rotor (4) has a structure separated from the output shaft (1a) of the electric 1H, the pump housing (6) and the rotor (4)
) and the output shaft (1a), there is no need for conventional precision during assembly.

(f'1 In the unlikely event that an abnormality occurs in the pump part, the rotor (4)
Even if it is stuck, the M moving W portion will not be damaged.

In addition, since the rotor (4) is made of high iron alloy steel whose surface is treated with nitrogen, the pump has excellent wear resistance, corrosion resistance, and heat resistance.

In addition, the above Toratake example showed a roller vane pump, but
The same effect can be obtained using vanes other than Rollare.

In addition, the electric magnet body (1'b) is composed of a single rod shape other than a disk shape or multiple rods, each of which is borated to N-8 next to each other and arranged in a radial manner. Alternatively, a U-shape as shown in FIG. 5 can produce the same effect.

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view showing a conventional combustion pump, Fig. 2 is a cross-sectional view showing only the Wwe of Fig. 1, and Fig. 8 is a partial cross-sectional view showing a conventional pump. FIG. 4 is a cross-sectional view showing the main part of FIG. 8, and FIG. 6 is a front view, partially in section, showing a sock gong according to another embodiment of the present invention. In the diagram, (7) is lightning! 'W-client of oar, (xa)G
j Output shaft, (lb) is magnetic material, (2) is pump pace,
(2a) is a protrusion, (4) is a rotor, (6) is a lobe, (
61 is a pump housing, and (7) is a pump case. In the drawings, the same reference numerals indicate the same or equivalent F portions. Agent Shin Kuzuno - Figure 1 1 +13U''

Claims (1)

[Claims] b) iir motion 41I! Due to the structure in which the chamber and the pump chamber are isolated through the pan wall, a magnet body magnetized to a single pole or multiple poles is output at the tip of the output shaft of the motor on the side of the motor-driven chamber. On the other hand, on the pump chamber side, there is a pump housing with a pump chamber whose inner circumference is circular, and inside this pump housing, the surface is coated with hot nitriding silicon. A rotor made of high-grade raw steel and magnetized in the circumferential direction &: single pole or multiple poles,
The rotor is equipped with a roller fitted into the rotor, and the rotational force of the electric motor is transmitted through both the magnetic body of the magnet at the tip of the output shaft and the rotor, which is made of a magnetic body. Characteristic rotary positive displacement fuel pump for automobiles. (2) The rotary displacement type tI for automobiles according to claim 1, which is rotatably supported on a protrusion provided on the rotor bulkhead! 5 needle pump.