JPH083179Y2 - Fuel pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fuel pump of a type using a flat commutator as a means for supplying electric power to a rotor of a motor section.

[Conventional technology]

A trochoid type fuel pump will be described as an example of a conventional fuel pump with reference to FIGS. 3 to 5.

In the figure, reference numeral 1 denotes a tubular casing main body having a fuel discharge passage inside, and 2 denotes an upper cover for covering the upper end side of the casing main body 1.

3 is provided in the lower part of the casing main body 1, covers the other end side of the main body 1 in the axial direction (lower end side in FIG. 3), and
It is a trochoid pump part that sucks fuel in a fuel tank (not shown) by being driven by a motor part 12 to be described later. A lower cover 4 having a suction port 4A and a relief port 4B, and an eccentric circular pump chamber 5A provided in contact with the upper surface of the lower cover 4.
Pump housing 5 having a pump housing, and the pump housing 5
Outer rotor 6 rotatably mounted in the pump chamber 5A of
And an inner rotor 7 which is mounted in the outer rotor 6 and meshes with each other to form a pressurizing chamber, and an outer rotor 6 and a pump housing 5 accommodating the inner rotor 7, which abuts on the upper surface of the pump housing 5 to form a pump chamber 5A. An upper plate 8 for sealing the inside, and a plurality of bolts 9,1 for integrally fixing the lower cover 4, the pump housing 5, and the upper plate 8
It consists of 0 ,. A fixed shaft 11 is provided on the lower cover 4, and an inner rotor 7 is rotatably attached to the fixed shaft 11. The inner rotor 7 is formed with engagement claws (not shown) into which three engagement claws 20A of the motor section 12 described later are inserted in order to drive the inner rotor 7 to rotate.

Reference numeral 12 denotes a motor portion that is provided between the upper cover 2 and the trochoid pump portion 3 and is provided in the casing body 1, and drives the trochoid pump portion 3. The motor portion 12 has a yoke 13 in the casing body 1. It is roughly configured by a pair of stators 14 and 14 fixed via the rotor 14 and a rotor 15 rotatably arranged in each of the stators 14. Where the rotor 15
Is rotatably supported on the inner circumference of the stator 14,
The armature 16 is composed of a laminated iron core having a pole arm portion 16A, and each coil 17 is wound around each arm portion 16A of the armature 16. A support shaft 18 is inserted into the armature 16. The support shaft 18 has an upper end rotatably supported in an engagement hole 2A provided in the upper cover 2.

Reference numeral 19 denotes a collar portion fixedly provided on the upper part of the armature 16 with the support shaft 18 inserted therethrough, and a flat commutator 21 described later is provided on the upper side surface of the collar portion 19. Reference numeral 20 denotes a tubular portion fixedly provided at the lower portion of the armature 16, and the tubular portion
The fixed shaft 11 is rotatably fitted to the fixed shaft 11, and the lower end of the fixed shaft 11 is provided with an engaging claw 20A that is inserted into an engaging hole formed in the inner rotor 7 of the trochoid pump unit 3.

Reference numeral 21 is a flat commutator which is in sliding contact with each brush 24, 25 described later and supplies power to each coil 17 wound around the armature 16. The flat commutator 21 is a combination of twelve fan-shaped segments 21A, 21A, ... Formed into a substantially disk shape. 21B, 21B, ... are risers respectively formed on the outer peripheral edge of each segment 21A and electrically connected to each coil 17, and each riser 21B is an outer peripheral surface of each segment 21A.
It is formed so as to project radially outward from 21C, and each coil 17 is hooked and wound.

22A and 23A are terminal pins provided on the upper end of the upper cover 2, and one ends of connection wirings 22B and 23B are connected to the terminal pins 22A and 23A. Reference numerals 24 and 25 are a pair of brushes slidably fitted in a pair of brush sliding holes 2B and 2C provided in the upper cover 2, and the lower ends thereof are in sliding contact with the respective segments 21A of the flat commutator 21. The brushes 24, 25 are connected to the connection wirings 22B, 23B, are provided by urging each segment 21A by springs 24A, 25A in the brush sliding holes 2B, 2C, and through each segment 21A and the riser 21B. Power is supplied to each coil 17.

The fuel pump having the above structure is mounted in a fuel tank of a vehicle or the like.

In the trochoid fuel pump of the prior art configured as described above, the terminal pins 22A, 23
A, a flat commutator 2 that is supplied with power to the brushes 24, 25 via the connection wirings 22B, 23B and is in sliding contact with the brushes 24, 25.
Coil 17 through each segment 21A and riser 21B of 1
When electric power is supplied to the rotor 15, the rotor 15 starts to rotate and the trochoid pump unit 3 is driven. As a result, the fuel sucked from the suction port 4A is discharged into the casing body 1, passes through the outer periphery of the commutator 21, and is discharged to the outside from the discharge port (not shown) of the upper cover 2.

[Problems to be solved by the device]

By the way, in the fuel pump having the above structure, each riser 21B constituting the flat commutator 21 has a segment 21A.
Since the riser 21B is formed so as to project radially outward from the outer peripheral surface 21C, when each riser 21B rotates integrally with the flat commutator 21, fuel passes through the outer periphery of the flat commutator 21 and flows toward the discharge port. , Stirred by each riser 21B.

The stirring action of fuel by each riser 21B is performed by the rotor 1
When 5 is low rotation, it is not a problem, but when it is high rotation (for example, 5000 to 6000 rpm), there is a problem that pulsation occurs in the fuel discharged from the discharge port due to the stirring action of this riser 21B. is there.

Furthermore, the fuel agitation action by each riser 21B causes a rotational load when the rotor 15 rotates, which causes an increase in power consumption.

The present invention has been made in view of the above-mentioned problems of the conventional art, and an object of the present invention is to provide a fuel pump capable of reliably preventing the pulsation of fuel and the generation of rotational load by the riser.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention has a casing body, a pump section provided in the casing body, and a motor section for driving the pump section. The motor section is fixed to the casing body. And a rotor that is located inside the stator and is rotatably provided in the casing body and that drives the pump unit at one axial end, and an axial direction of the rotor. A flat commutator provided on the other end side and formed of a plurality of segments respectively connected to the coils of the rotor, and provided on the other end side in the axial direction of the casing body, and slidably contacting each segment of the flat commutator. A fuel pump comprising a pair of brushes for supplying power to each coil, wherein the outer peripheral surface of each segment is on the outer peripheral side of each segment of the flat commutator. And a riser that is located inside each of the recesses and is formed into a claw shape that is bent into an L shape and that is electrically connected to each coil of the rotor. The riser employs a structure characterized in that its outer peripheral edge is formed so as to substantially coincide with the outer peripheral surface of each segment.

[Action]

With the above-described configuration, on the outer peripheral side of each segment of the flat commutator, a recessed portion that is recessed inward from the outer peripheral surface thereof is provided, and each recessed portion has a claw shape bent into an L shape, and the outer peripheral edge thereof is Since a riser that substantially matches the outer peripheral surface of each segment is formed and each riser is electrically connected to each coil of the rotor, the flat commutator rotates integrally with the rotation of the rotor, and the flat commutator Even when the fuel circulates on the outer peripheral side, the risers do not come into direct contact with the flow of the fuel, the fuel is not agitated by the risers, and pulsation and rotational load are prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment also, a trochoid fuel pump is used as the fuel pump. Since the overall configuration of the fuel pump is almost the same as the above-mentioned conventional technique,
The same members are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 31 is a rotor of the present embodiment, and the rotor 31 is an armature 32 composed of a laminated iron core having 12 pole arms 32A.
And each coil 33 wound around each arm 32A of the armature 32.

34 is a flange part provided on the upper part of the armature 32, 35 is a flat commutator consisting of 12 segments 35A, 35A, ... Attached to the flange part 34 and electrically connected to the coils 33, respectively. On the outer peripheral side of each segment 35A of the flat commutator 35, a recessed portion 35C recessed inward from the outer peripheral surface 35B is provided, and in each recessed portion 35C, each riser 36 adopted according to this embodiment is provided. Has been formed.

Here, each riser 36 is formed in a claw shape that is bent upward in an L shape, and one end of each coil 33 is connected. Furthermore, each riser 36 minimizes the load generated between the flat commutator 35 and the fuel due to the rotation of the flat commutator 35.
Each segment 35A is located inside each recess 35C that is recessed inward from the outer peripheral surface 35B, and its outer peripheral edge 36A is located in each segment 35A.
It is formed so as to substantially coincide with the outer peripheral surface 35B which is the outer peripheral edge of A.

Although the trochoidal fuel pump of this embodiment is configured as described above, it is possible to connect the terminal pins 22A and 23
A, each brush 24, 25, each segment 35A and each riser 36
When the coil 33 of the rotor 31 is energized via the above, the rotor 31 starts to rotate and the trochoid pump unit 3 is driven. Then, similarly to the conventional technique, the fuel sucked from the suction port 4A is discharged into the casing body 1, passes through the outer periphery of the commutator 35, and is discharged to the outside from the discharge port of the upper cover 2.

The fuel discharged from the pump unit 3 is affected by the rotation of the commutator 35 when passing through the outer periphery of the rotating commutator 35, but each riser 36 has the same peripheral surface as the outer peripheral surface 35B of each segment 35A. Therefore, even if the commutator 35 rotates, the combustor 35 does not stir the fuel to cause pulsation of the fuel or a rotational load on the rotor 31 side. The property is improved.

Although the trochoid pump portion 3 is illustrated as the pump portion in the above-described embodiment, the pump portion of the present invention is not limited to this, and a turbine vane type pump portion or a roller vane type pump portion may be used.

[Effect of device]

As described in detail above, according to the present invention, on the outer peripheral side of each segment of the flat commutator, there is a recessed portion that is recessed inward from the outer peripheral surface of each segment, and the flat commutator is bent into an L-shape inside each recessed portion. And a riser electrically connected to each coil of the rotor, and each riser is formed so that its outer peripheral edge substantially coincides with the outer peripheral surface of each segment. Therefore, when the fuel pump operates, the flat commutator rotates together with the rotor, and even when the fuel flows around the flat commutator, it is possible to effectively eliminate the fuel agitation by each riser, and the pulsation in the discharged fuel is increased. And the rotational load on the rotor side does not increase, and the reliability of the fuel pump is improved.

[Brief description of drawings]

1 and 2 relate to an embodiment of the present invention, FIG. 1 is a perspective view showing a rotor provided with a flat commutator, FIG. 2 is a plan view of the rotor shown in FIG. 1, and FIG. Through fifth
FIG. 3 relates to the prior art, FIG. 3 is a longitudinal sectional view showing the overall structure of a trochoidal fuel pump, FIG. 4 is a perspective view showing a rotor provided with a flat commutator, and FIG. 5 is a rotation shown in FIG. It is a top view of a child. 1 ... Casing body, 3 ... Trochoid pump part, 12
...... Motor part, 14 …… Stator, 24,25 …… Brush, 31…
… Rotor, 33 …… Coil, 35 …… Flat commutator, 35A …… Segment, 35B …… Outer peripheral surface, 35C …… Dimple, 36 …… Riser.

Claims (1)

[Scope of utility model registration request] 1. A stator provided with a casing body, a pump portion provided in the casing body, and a motor portion for driving the pump portion, and a stator provided by fixing the motor portion to the casing body. A rotor that is located inside the stator and is rotatably provided in the casing body, and that drives the pump unit at one end side in the axial direction, and is provided at the other end side in the axial direction of the rotor, A flat commutator composed of a plurality of segments respectively connected to the coils of the rotor, and a pair provided on the other axial end of the casing body and slidingly contacting each segment of the flat commutator to supply power to the coils. In a fuel pump configured with a brush of, the outer peripheral side of each segment of the flat commutator,
A recessed portion that is recessed inward from the outer peripheral surface of each segment, and a riser that is located in each recessed portion and is formed into a claw shape that is bent into an L shape and that is electrically connected to each coil of the rotor. And each of the risers is formed such that the outer peripheral edge thereof substantially coincides with the outer peripheral surface of each segment.