JPS60182380A - Rotary displacement type fuel pump - Google Patents

Abstract

PURPOSE:To suppress the vibration and vibration noise of a connected equipment by arranging a shielding plate in a fuel suction space and damping the pulsation on the fuel suction side. CONSTITUTION:When a rotor 8 revolves, fuel is inhaled successively from a suction pipe 17 through the first chamber 30a, small hole 29b and the second chamber 30b, and then sent under pressure into a discharge pipe 24 similarly in the conventional. Though the minus pulsation is generated on the fuel suction side in this case, as in the conventional, this pulsation is softened by a shielding plate 29 for preventing pulsation which is arranged in a suction space 30 formed by a pump cover 16 and damped by the application of the resistance. In order to effectively perform this damping, the small hole 29a which communicates to two chambers 30a and 30b in the suction space 30 is formed at the position departed from a suction passage 18 and a suction pipe 17. Therefore, the pulsation generated on the suction side is damped by the shielding plate 29, and the vibration and vibration noise of the constitution parts of the equipment connected to the suction side can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary positive displacement fuel pump that copes with pulsation on the fuel suction side.

[Prior art]

First, a conventional example will be explained with reference to FIGS. 1 and 2.

FIG. 1 is a partially cutaway side view of a rotary positive displacement fuel pump for supplying gasoline to a gasoline engine. In this figure, (1) is a circular yoke, and a bearing member (2) is provided at the center of a wall surface (1a) connected to one end of the yoke. (3) is a motor, which consists of a permanent magnet (4) and an armature (5) provided within the yoke (1). (6) is a rotating shaft of the armature (5), one end (6a) of which is supported by the bearing member (2).

(7) is a pump device, the rotor (8) of which is fixed to one end (6a) of the rotating shaft (6);
The pump housing (9) into which the pump housing (9) is fitted is fixed to the wall surface (1a) of the yoke (1) with screws (2), together with the side plates αI, (11) whose both sides are closed. The inner circumferential surface (9a) of the housing is eccentric by a certain amount l (FIG. 2) with respect to the rotating shaft (6) to form a pump chamber Q3. Further, the rotor (8) has recesses (8a) at multiple positions on the outer circumference (Fig. 2), and each recess (8a)
The rotor (8) is placed against the inner peripheral surface (9a) of the housing.
A roller Q4 is fitted so as to be freely retractable in and out of the radius. The pump main body Qf9 having such a configuration has the above-mentioned yoke (
1) is covered by a pump cover Oej attached to the outer circumference of the wall surface (1a). The suction pipe α provided on the pump cover Qej is guided to the suction boat 0 to the pump chamber α [existed] by the suction passage (to), and the discharge boat (a) from the pump chamber 01 is connected to the above-mentioned The hole (1b) in the wall (1a) leads to the internal space Qη of the yoke (1).

Furthermore, in FIG. 1, the bracket is a bracket that is fitted and fixed to the other end of the yoke (1), and the bearing member (C) provided in the center of this bracket is attached to the rotating shaft (C).
6) The other end (6b) is supported. bracket(
The bearing hole (22a) of the yoke (1) is uneven in the circumferential direction, and supports the bearing member (c) at the convex part, and guides the internal space (c) of the yoke (1) to the discharge pipe (c) by the concave part. ing.

(C) is a cover provided with the above-mentioned discharge pipe (C), (E) is a commutator provided on the rotating shaft (6), the fins are brushes in contact with the commutator (E), (28a), (28b) is O for seal
It's a ring.

Next, the operation of the above configuration will be explained.

When the armature (5) rotates due to the power feeding action of the brush (goods) shown in Figure 1, the rotating shaft (6) and rotor (8) integrated with it rotate.
rotates in the direction of arrow S in FIG. As a result, roller 0
4 rolls in contact with the inner circumferential surface of the housing (9a) due to centrifugal force, causing the suction bow of pump chamber a3).In DI, by swinging out roller 0, adjacent rollers (J4) and Q4)
The volume between them increases and the pressure decreases. This allows suction pipe a
7) through the suction passage (G), fuel is sucked in between the rollers 0 fathom and α→ of the suction bow) (M).Then, as the rotor (8) further rotates, the
The space (18a) between q4) is cut off from the suction boat 00, and the space (18a) is
) decreases in volume, the pressure increases, and the fuel in the space (18a) is discharged to the discharge bow)]. The fuel discharged to the discharge port (1) is supplied to a predetermined engine through the hole (1b), the internal space η of the yoke (1), the recess of the bearing hole (22a), and the discharge pipe (c) in this order.

By the way, in the above-mentioned rotary positive displacement fuel pump, pulsation occurs due to changes in the volume of the pump chamber α field, so on the fuel suction side, the device (not shown) connected to the suction pipe Qη
There was a drawback that the component parts vibrated due to the above pulsation and vibration noise was generated.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and a rotary shield plate is arranged in the fuel intake space to damp pulsations on the fuel intake side and suppress vibrations and vibration noise of connected equipment. The purpose of the present invention is to provide a positive displacement fuel pump.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 8 is a partially cutaway side view of a rotary positive displacement fuel pump according to an embodiment of the present invention. In this figure, a shielding plate for preventing pulsation is placed in the suction space formed by the pump cover H, and a flange (29a) on its periphery covers the surface of the side plate Qυ. →
is attached to. In other words, the above-mentioned suction space (to)
There are two rooms (aoa) on the upstream side and downstream side due to the poppies and the cover plate.
, (80b).

Thus, the two chambers (80a) and (80b) communicate with each other through the small holes (29b) in the edge and shield plate.

Note that the other components are the same as those of the conventional one, so the same parts are given the same reference numerals and the explanation thereof will be omitted.

In the rotary positive displacement fuel pump configured as shown in FIG. 8, when the rotor (8) rotates, fuel flows into the suction pipe (17).
) to the first chamber (80a), the small hole (29b), and the second chamber (a
ob), and then, as in the past, the discharge pipe (
c). At this time, negative pulsations occur on the fuel suction side as in the past, but these pulsations are attenuated by the resistance caused by the shield and shield plate. In order to effectively perform this damping, two chambers (80a
), the small hole (29b) communicating between (80b) is the suction passage (g) and the suction pipe Q? ) is located far away from the

〔Effect of the invention〕

As described above, according to the rotary positive displacement fuel pump according to the present invention, the pulsation generated on the suction side is attenuated by the shield plate, so vibrations and vibration noise of the components of equipment connected to the suction side are attenuated. The effect of suppressing this can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a conventional rotary positive displacement fuel pump, FIG. 2 is a view taken along the line A-A in FIG. 1, and FIG. 8 is a rotary positive displacement fuel pump according to an embodiment of the present invention. FIG. 2 is a partially cutaway side view of the fuel pump. (8)...rotor, (8a)...recess, (9a)...
...Inner circumferential surface, al...pump chamber, Q4)...roller, fence...shielding plate, (1)...suction space. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa Procedural amendment (voluntary) Mr. Commissioner of the Japan Patent Office 1. Indication of case: Japanese Patent Application No. 59-040703 2. Title of invention: rotary positive displacement fuel pump 3. Person making the amendment: Relationship with the case: Patent applicant Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name:
(601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent 5, "Detailed Description of the Invention" column of the specification to be amended. 6. Contents of amendment (1) The description is amended as follows. (2)

Claims (1)

[Claims] (1) By fitting rollers into recesses provided at multiple positions on the outer circumference of the rotor and rotating the rotor in a pump chamber eccentric to the rotor, the rollers roll along the inner peripheral surface of the pump chamber. In a rotary positive displacement fuel pump that sucks and discharges fuel. A rotary positive displacement fuel pump characterized in that a shielding plate for damping pulsation is disposed within the fuel suction space into the pump chamber.