JPS6346277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller vane pump, such as a roller vane pump for fuel delivery to automobiles.

Figures 1, 2, and 3 show conventional examples of roller vane pumps. In the figures, 1 is a cylindrical motor yoke forming a part of the casing, and a wall 1A is formed on the other side. A protruding portion 1B is formed in the center of 1A. Reference numeral 2 denotes a bracket having a first stepped portion 2A and a second stepped portion 2B formed inside and outside, and the annular first stepped portion 2A is fitted into the opening 1C of the motor yoke 1. 2C is a recess formed in the center of the bracket 2 and opened to the motor section 3 side, 2D is a semicircular step continuous to the recess 2C, and 2E is a first hole bored in the bracket 2 continuous to the step 2D. This is a through hole. 4 is bracket 2
is fitted onto the outer periphery of the annular second step portion 2B, and
The discharge side cover forms a part of the casing whose outer periphery is fitted into the opening 1C of the motor yoke and is fixed to the bracket 2. 4A is a second through hole passing through the center of the discharge side cover 4. . 5 is a cylindrical discharge tube, the other end of which is fitted into the second through hole 4A.

6 is a first bearing that is fitted into the step 2D of the bracket 2 and fixed by a presser foot 7; 8 is a brush device connected to an external conductor (not shown); 9 is fitted into the protruding portion 1B of the motor yoke 1. A second bearing 10 is inserted and fixed by a presser foot 7, and 10 is a first and a second bearing.
11 is a commutator that comes into contact with the brush device 8 fitted on the main shaft 10, 12 is an armature fitted on the main shaft 10, and the outer periphery of this armature. A permanent magnet 1 facing the motor yoke 1 and installed inside the motor yoke 1 to serve as a magnetic field section.
A motor consisting of 3.

Reference numeral 14 denotes a pump cover which covers a pump device 16 to be described later to form a pump part 15 on the other side of the motor part 3, and which forms part of a casing whose outer peripheral part is fitted onto the motor yoke 1 by, for example, a press. It is. 14A is a third through hole passing through the center of the pump cover 14. 3
0 is a cylindrical suction cylinder, one side of which is connected to the third through hole 14
It is inserted into A and welded or soldered. Reference numeral 16 denotes a pump device, which has the following configuration, details of which are shown in FIGS. 2 and 3. In other words, 17 is the inner circle 17A
The axial center of the pump housing is shifted from the axial center of the main shaft 10 by a predetermined amount. 18 is a rotor that is fitted into the main shaft 10 and is rotatable; 18A is a rotor 18;
A plurality of grooves 19 are formed on the outer periphery of the groove 18.
A rotatable roller inserted in A, 20 is roller 1
A pump chamber 9 is formed between the inner circle 17A of the pump housing 17 divided into a plurality of parts and the outer circumference of the rotor 18, and a pump chamber 21 is formed between the outer circumference of the roller 19 and the groove 18A of the rotor 18. It is a space where 22 is a first lid member that closes one side (upper side) of the pump housing 17;
A through hole 23 corresponding to 0 is bored. 24 is the other side (lower side) of the pump housing 17
A second lid member for closing the pump chamber 20 is provided with a discharge hole 25 extending therethrough and corresponding to the pump chamber 20 . The first and second lid members 22 and 24 are made of a plate material such as a metal plate that can be press-cutted. 2
6 communicates with the discharge hole 25 and the wall 1 of the motor yoke 1
This is the discharge hole formed in A. Numeral 27 is a tightening screw that screws the pump housing 17, the first lid member 22, and the second lid member 24 onto the wall 1A.

In the conventional roller vane pump having the above configuration, first, when power is supplied to the commutator 11 from an external conductor (not shown) via the brush device 8,
The main shaft 10 to which the armature 12 is fitted rotates. Therefore, as the rotor 18 rotates, a well-known pumping action is performed in the pump chamber 20 by the movement and rotation of the roller 19 fitted into the groove 18A of the rotor 18. Due to this action, fuel flows into the motor 3 via the pump device 16.
This state will be explained in detail with reference to FIGS. 2 and 3. When the rotor 18 rotates as described above,
Due to the action of the roller 19 rotating along the inner circle 17A, the pump chamber 20 gradually becomes larger from the vicinity of the fourth through hole 23 on the suction side. Therefore, negative pressure is generated in the pump chamber 20 and fuel flows into the pump chamber 20. The fuel that has flowed into this pump chamber 20 is transferred to the rotor 1
8 and flows into the motor 3 through the discharge holes 25 and 26, and further into the recess 2 of the bracket 2.
C is supplied to the load via the first through hole 2E and the discharge cylinder 5.

The conventional roller vane pump described above has the following drawbacks. That is, the fuel is transferred to the motor 3 through the fourth through hole 23, the pump chamber 20, and the discharge holes 25 and 26. In this case, the fuel intake hole 2
3 and the discharge hole 25 are opposed to each other in the axial direction of the roller 19, so that the suction hole 2
The fluid pressure of fuel applied to the roller 19 corresponding to No. 3 and the roller 19 corresponding to the discharge hole 25 in the axial direction changes. Therefore, during rotation, the roller 19
The lid member 22 and the second lid member 24 are pressed alternately. Therefore, sound is generated by the reciprocating movement of the roller 19 in the axial direction. Moreover, the fourth through hole 23
is formed in the first lid member 22, so the above-mentioned sound resonates with the pump cover 14 through the fourth through hole 23, resulting in a large sound.

This invention addresses the above-mentioned drawbacks of the roller vane pump, and includes forming a communication hole in one lid member and the pump housing along the axial direction of the roller from the other side in the axial direction of the roller, and communicating with the communication hole. By drilling a suction hole and a discharge hole in the other lid member so that the suction hole and the discharge port communicate with each other from the same direction into the pump chamber, the axial movement of the roller is eliminated, and the pump is smooth and quiet. To provide a roller vane pump with improved durability.

An embodiment of the present invention shown in FIGS. 4 and 5 will be described below. In the figure, reference numeral 28 denotes a communication hole bored between the first cover member 22 forming the upper cover of the pump housing and the pump housing 17 forming the main body thereof, and is bored along the axial direction of the roller 19. . Reference numeral 29 denotes a suction hole that communicates the communication hole 28 with the pump chamber 20, and is bored in the second lid member 24 forming the lower lid of the pump housing. Arrows F in FIGS. 1 to 3 indicate the inflow and outflow routes of fuel.

In the configurations shown in FIGS. 4 and 5 above, when negative pressure is generated in the pump chamber 20 due to the rotation and rotation of the rotor 18 and roller 19, the fuel from the suction cylinder 30 passes through the communication hole 28 and enters the suction hole 29. After reaching the pump, it makes a U-turn and flows into the pump chamber 20, and is pumped to the motor section 3 through the discharge holes 25 and 26 (Fig. 1).
be done.

As described above, according to the present invention, the suction hole and the discharge hole that open from the same direction into the pump chamber are formed in the lid member that closes one side of the pump housing, and the inhaled fuel is passed through the suction hole. Since the communication hole leading into the pump chamber is formed in the pump housing which is thick in the axial direction, the length of the communication hole becomes long, and as a result, when the sucked fuel flows through this communication hole, fuel pulsation is inevitable. The sound damping effect of the pump is improved.

Further, according to the present invention, since the lid member is made of a plate material, the suction hole 29 and the discharge hole 25 can be formed at the same time during press punching, which has the effect of reducing the number of manufacturing steps. ing. Moreover, it has the effect that the entire pump can be manufactured in a compact size.In particular, this kind of small fuel pump is designed so that the fuel sucked into the pump chamber from one side of the pump housing is discharged from the other side of the pump housing. It is useful if it is implemented.

[Brief explanation of the drawing]

Figures 1, 2, and 3 show a conventional roller vane pump, with Figure 1 being a longitudinal sectional view, Figure 2 being a partially cutaway plan view showing the main parts, and Figure 3 showing the main parts. The longitudinal cross-sectional view, FIGS. 4 and 5 show one embodiment of the present invention. FIG. 4 is a partly cutaway plan view showing the main part, and FIG. 5 is a longitudinal cross-sectional view showing the main part. be. 1...Motor yoke forming part of the casing, 4...Discharge side cover forming part of the casing, 5...(discharge cylinder), 12...Motor, 14
...Pump cover forming part of the casing,
16... Pump device, 17... Pump housing, 17A... Inner circle, 18... Rotor, 18A...
...Concave groove, 19...Roller, 20...Pump chamber, 2
DESCRIPTION OF SYMBOLS 1...Second space, 22...First lid member forming the upper lid of the pump housing, 23...Through hole, 24
...Second lid member forming the lower lid of the pump housing, 25...Discharge hole, 28...Communication hole, 29...
Suction hole, 30...Suction cylinder. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A pump device and a motor for driving the pump device are built in a cylindrical casing, and the fuel sucked into the casing in the axial direction from a suction cylinder provided on one end surface of the casing is A plate material that closes the other axial side of the pump housing through a through hole provided in a lid member made of a plate material that closes one axial side of the pump housing of the pump device through a pump chamber in which a rotating rotor is housed. In a roller vane pump that discharges water into a casing from a discharge hole provided in a lid member made of the same, and discharges water to the outside from a discharge tube provided on the other end surface of the casing through a gap in the motor located on the other side, A suction hole opening from the same direction as the discharge hole is formed in the pump chamber in the lid member that closes the other side of the pump housing, and the fuel is sucked from one side of the pump housing through the through hole. A roller vane pump characterized in that a communication hole is formed in the pump housing to guide the water into the pump chamber through the suction hole.