JP4120175B2 - Motor fuel pump - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a motor-type fuel pump including a pump unit that sucks and discharges fuel in a pump case, and a motor that rotationally drives the pump unit. The motor-type fuel pump boosts the fuel in a fuel tank. And used for a fuel injection device of an internal combustion engine that supplies the fuel injection valve.
[0002]
[Prior art]
In such a motor-type fuel pump, the fuel supplied from the fuel pump toward the fuel injection valve is clean without containing foreign substances because the fuel metering portion controlled by the fuel injection valve is formed with a very small gap. Therefore, a filter for removing foreign matters in the fuel is attached.
This filter is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-193552. In this filter, a fuel pump and a filter are separately prepared, and the filter is connected and arranged downstream of the fuel pump.
4 and 5 show a case in which a pump case forming a fuel pump is extended along the axial direction and a filter is arranged in the pump case.
3 shows that the filter F, the pump P, and the motor M are arranged in the order of the pump case K in the pump case K, and the pump part P, the motor M, and the filter F shown in FIG. Are arranged in this order.
[0003]
[Problems to be solved by the invention]
According to such a conventional fuel pump, since the filter is disposed on the downstream side of the fuel pump, clean fuel can be supplied toward the fuel injection valve. However, the fuel pump including the filter is compactly assembled. I can't.
On the other hand, even in motorcycles, in recent years, fuel injection devices have been adopted for the purpose of reducing harmful exhaust gases, and accordingly, downsizing of the fuel pump is strongly desired. This is because, in particular, a motorcycle has a very small storage space for these parts as compared to a four-wheeled vehicle, and is greatly limited in arrangement.
[0004]
The motor-type fuel pump according to the present invention has been made in view of the above-mentioned problems. The motor-type fuel pump is a motor type suitable for a fuel injection device for a motorcycle by reducing the size of the fuel pump with a built-in filter and reducing the manufacturing cost. The main purpose is to provide a fuel pump.
[0005]
[Means for solving the problems]
The motor type fuel pump according to the present invention has a motor chamber in which a motor is accommodated in a pump case for achieving the above-mentioned object,
A motor-type fuel pump that includes a pump unit that performs a pumping action by rotation of the motor, and in which fuel boosted by the pump unit is discharged from the discharge path to the outside through the motor chamber;
A filter formed in a cylindrical shape is disposed on the outer periphery of the motor in the motor chamber, and the motor chamber is formed on the inner side of the filter facing the motor by a cylindrical portion formed of a filter or the like having a filtration performance.
It is divided into the outside of the filter facing the inside of the pump case,
The first feature is that the pump discharge passage connected to the pump chamber of the pump is opened inward of the filter and the discharge passage is opened outward of the filter.
[0006]
In addition to the first feature of the present invention, the motor is an outer rotor type brushless motor, and the second feature is that the cylindrical filter is disposed so as to surround the outer periphery of the rotor yoke of the motor. To do.
[0007]
According to the present invention, in addition to the first feature, the filter includes a bottom portion, a cylinder portion extending upward from the outer periphery of the bottom portion, one end connected to the inside of the filter, and the other end to the pump discharge path. A third feature is that a continuous filter discharge path is provided, and one end of the filter discharge path protrudes upward from the bottom of the filter.
[0008]
Furthermore, in addition to the second feature of the present invention, a pump housing and a pump cover are fixedly disposed at one end of the pump case, and a bearing holding cover is fixedly disposed at the other end.
A fourth feature is that the pump chamber of the pump section is formed by a pump housing and a pump cover, and the rotation shaft of the motor is rotatably supported by the bearing holding cover and the pump housing.
[0009]
Furthermore, the present invention is characterized in that, in addition to the fourth feature, the pump cover is provided with a pump suction passage that goes into the pump chamber and a discharge passage that continues to the outside of the filter.
[0010]
[Action]
According to the first feature of the motor type fuel pump of the present invention, the foreign matter in the fuel which goes to the discharge path is removed by the filter in the motor chamber.
Since the filter is formed in a cylindrical shape, it is possible to increase the filtration area of the filter, and it is easy to store in the motor chamber, and the discharge path is formed by forming the outer side of the filter as an annular filtration chamber. The degree of freedom in selecting the opening can be increased.
[0011]
According to the second feature of the present invention, since a relatively large annular space can be formed in the motor chamber between the rotor yoke and the pump case, it is suitable for disposing a cylindrical filter.
[0012]
According to the third feature of the present invention, particularly when the motor is stopped, foreign matter existing inside the filter is effectively prevented from entering the pump portion through the filter discharge path .
[0013]
According to the fourth aspect of the present invention, the pump chamber is formed by the pump housing and the pump cover, and both ends of the rotating shaft are rotatably supported by the bearing holding cover and the pump housing, so that the assembly workability can be improved. .
[0014]
According to the fifth feature of the present invention, since the pump suction path and the discharge path are provided in the pump cover, the design flexibility of the fuel pipe can be improved when the fuel pump is mounted below the fuel tank in the motorcycle.
[0015]
【Example】
An embodiment of a motor type fuel pump according to the present invention will be described below with reference to FIG.
K is a cylindrical pump case, and the other end K2 opens upward via the upper locking step K1 and one end K4 opens downward via the lower locking step K3.
A pump housing 1 is disposed in contact with the lower locking step K3 of the pump case K, and a pump cover 2 is disposed in contact with the lower surface of the pump housing 1. In this state, one end K4 of the pump case K is The lower end is caulked inward toward the pump cover 2, whereby the pump housing 1 and the pump cover 2 are fixedly disposed on the lower locking step K 3.
Reference numeral 3 denotes a bearing holding cover disposed in contact with the upper locking step portion K1 of the pump case K. In this state, the upper end of the other end KC of the pump case K is caulked inward toward the bearing holding cover 3. As a result, the bearing holding cover 3 is fixedly disposed on the upper locking step K1.
A pump chamber 4 is formed between the contact surfaces of the pump housing 1 and the pump cover 2, and the pump discharge path 6 formed in the pump housing 1 and the downstream side of the pump suction path 5 formed in the pump cover 2. The upstream side of the pump chamber 4 opens into the pump chamber 4.
On the other hand, the upstream side of the discharge passage 7 formed in the bearing holding cover 3 opens toward the pump case K.
Accordingly, a motor chamber 8 is formed which is closed by the inner side K5 of the pump case K, the upper surface 1A of the pump housing 1 and the lower surface 3A of the bearing holding cover 3, and is downstream of the pump discharge path 6 and upstream of the discharge path 7. The side opens to the motor chamber 8.
[0016]
The motor M consists of the following.
Reference numeral 10 denotes a rotor yoke having a bottomed cylindrical shape. A magnet 11 is fixedly disposed on the inner peripheral wall of the rotor yoke 10 with an adhesive or the like, and is integrally fixed to a rotary shaft 12 penetrating the center of the rotor yoke 10.
The upper portion of the rotary shaft 12 is rotatably supported by a cylindrical portion 3B that goes downward from the center of the bearing holding cover 3 via a bearing B, and the lower portion of the rotary shaft 12 is rotated by the pump housing 1 via a bearing C. A stator 13 is wound around an armature coil 14, and the stator 13 is disposed inside the rotor yoke 10 and fixedly disposed outside the cylindrical portion 3B.
The motor M formed as described above is accommodated in the motor chamber 8.
[0017]
The pump part P houses and arranges the impeller 15 in the pump chamber 4, and the lower end of the rotary shaft 12 is engaged with the impeller 15.
[0018]
According to the above, one end K4 of the pump case K is closed by the pump housing 1 and the pump cover 2, and the impeller 15 is accommodated in the pump chamber 4 between the pump housing 1 and the pump cover 2, and the pump part P The other end K2 of the pump case K is closed by the bearing holding cover 3, and the motor M is accommodated in the motor chamber 8 formed by the bearing holding cover 3, the pump case K, and the pump housing 1. .
[0019]
In the motor chamber 8, a filter F for removing foreign substances contained in the fuel flowing from the motor chamber 8 toward the discharge passage 7 is accommodated.
The filter F is formed with a cylindrical tubular portion FD (this tubular portion FD is formed by a mesh having a filtering performance) upward from the bottom portion FA, and a fitting tubular portion FB is formed at the upper end thereof. At the same time, a filter discharge passage FC is formed through the bottom FA.
The filter F is disposed in the motor chamber 8. Specifically, the bottom portion FA of the filter F is disposed on the upper surface 1 </ b> A of the pump housing 1, and the cylinder portion FD surrounds the outer periphery of the rotor yoke 10 of the motor M. Further, the fitting cylinder portion FB is fitted and arranged on the inner peripheral wall 3C of the annular groove 3B formed in the lower surface 3A of the bearing holding cover 3.
In this state, the pump discharge path 6 that is drilled in the pump housing 1 is connected to the filter discharge path FC that is drilled in the bottom FA of the filter F.
Further, the upstream side of the discharge passage 7 formed in the bearing holding cover 3 is communicated with the annular groove 3B.
[0020]
Next, the operation will be described.
When the rotor yoke 10 is rotated by supplying power to the amateur coil 14, this rotation causes the impeller 15 to rotate via the rotating shaft 12, and the fuel in the fuel source (not shown) is pumped through the pump suction path 5 to the pump chamber 4. The fuel sucked into the pump chamber 4 and pressurized in the pump chamber 4 is supplied to the inner F1 of the filter F through the pump discharge passage 6 and the filter discharge passage FC. The fuel in the inner F1 is supplied to the filter F. Foreign matter is removed by the tube portion FD and discharged to the filtration chamber A formed by the outer side F2 of the main filter F and the inner side K5 of the pump case K.
The cleanly filtered fuel in the filtration chamber A is supplied from the discharge passage 7 to the fuel distribution pipe equipped with, for example, a fuel injection valve via the annular groove 3B.
[0021]
According to the above, the motor type fuel pump provided with the filter F inside can be formed compactly.
That is, since the filter F is formed in a cylindrical shape and disposed in the existing motor chamber 8 formed on the outer periphery of the motor M, the filter F can be equipped without increasing the overall height and outer diameter of the fuel pump.
Moreover, since the part which has especially filtration performance of the filter F is formed by the cylindrical cylinder part FD, a filtration area can be taken large and favorable filtration performance can be maintained over a long period of time.
Further, when the filter F is formed by the cylindrical tube portion FD and disposed in the motor chamber 8, the tube portion FD collides with the rotating fuel flow generated by the rotation of the motor M while colliding with the tube portion FD. It flows into the filtration chamber A from the FD, and when a foreign substance adheres to the cylinder part FD of the inner F1 of the filter F, the foreign substance is peeled off by the rotating fuel flow and the foreign substance adheres to the cylinder part FD and is clogged. Is suppressed.
Therefore, good filtration performance can be maintained over a long period of time.
Furthermore, according to the motor type fuel pump of the present invention, its assembling property can be improved.
That is, first, the pump housing 1 and the pump cover 2 are arranged toward the lower locking step portion K3 of the pump case K. In this state, one end K4 of the pump case K is directed inward toward the pump cover 2. Caulking is combined.
At this time, the impeller 15 is accommodated in a rotatable state in the pump chamber 4 formed by the pump housing 1 and the pump cover 2.
Second, the filter F is inserted and arranged from the opening of the other end K2 of the pump case K into the pump case K. At this time, the bottom FA of the filter F is arranged on the upper surface 1A of the pump housing 1. The
Third, the bearing holding cover 3 to which the motor M is attached is disposed on the upper locking step K1 of the pump case K. At this time, the bearing B of the pump housing 1 is inserted below the rotating shaft 12 of the motor M. A motor M that is engaged with the impeller 15 and formed by the rotor yoke 10 or the like is disposed in the motor chamber 8 inside the cylindrical portion FD of the filter F.
In this state, the other end K <b> 2 of the pump case K is crimped inward toward the bearing holding cover 3.
This completes the assembly of the motor type fuel pump. The parts are simply arranged sequentially toward the lower locking step K3 and the upper locking step K1 of the pump case K, and one end K4 of the pump case K and the like. Since it is only necessary to crimp the end K2, the assembly is very simple and can be performed in a short time.
[0022]
Further, when the outer rotor type brushless motor having the rotor yoke 10 on the outer periphery is used as the motor, the motor chamber 8 composed of an annular space can be formed by the outer periphery of the rotor yoke 10 and the inner side K5 of the pump case K. It is suitable for disposing the filter F.
Further, when the brushless motor is used, it is not necessary to open a recess for storing the brush or the pick tail in the lower surface 3A of the bearing holding cover 3, so that it is easy to form the closed motor chamber 8. (A part of the motor chamber 8 is formed by the lower surface of the bearing holding cover 3)
[0023]
Furthermore, according to the fact that the filter discharge passage FC that opens to the bottom FA of the filter F protrudes upward from the bottom FA, foreign matter that has accumulated in the bottom FA during long-term use is removed from the filter discharge passage FC and the pump. Inflow into the pump chamber 4 via the discharge path 6 is suppressed, and the pump performance can be maintained satisfactorily.
[0024]
Still another embodiment will be described with reference to FIG.
Only the parts different from FIG. 11 will be described, and the same structural parts are denoted by the same reference numerals and the description thereof will be omitted.
In this example, the pump suction path 5 and the discharge path 7 are provided in the pump cover 2 and open toward the outside.
The filter F is provided with a cylindrical tube portion FD upward from the bottom portion FA, and an annular flange FE is formed at the upper end of the tube portion FD.
And this filter F is arrange | positioned in the motor chamber 8, At this time, bottom part FA is arrange | positioned on the upper surface 1A of the pump housing 1, and upper annular collar part FE is the inner side K5 of the upper part of the pump case K. Is fitted and arranged. Fuel leakage from the fitting portion of the annular flange FE is suppressed.
According to the above, the inner side F1 and the outer side F2 of the filter F are connected by the cylinder part FD provided with filtration performance, and the filtration chamber A is formed in the motor chamber 8 of the outer side F2 of the filter F.
A discharge passage 7 formed in the pump cover 2 and opening outward is connected to the filtration chamber A through a discharge passage 1B formed in the pump housing 1 and opens.
Accordingly, the fuel supplied from the pump chamber 4 into the motor chamber 8 in the inner F1 of the filter F is removed by the cylinder portion FD of the filter F, flows into the filtration chamber A, and cleans the filter chamber A. Fresh fuel is supplied to the outside through the discharge passages 1B and 7.
[0025]
According to the above, it is suitable as a fuel pump used in a fuel supply device for a motorcycle.
That is, in the motorcycle, when the fuel pump is housed in the fuel tank, the fuel pump is often placed in the fuel tank through an opening formed below the fuel tank in view of the fuel tank.
In this case, when the pump suction passage 5 and the discharge passage 7 of the fuel pump are opened downward as in the present embodiment, the suction that communicates the pump suction passage 5 and a fixed position in the fuel tank. The degree of freedom of the arrangement of the discharge pipe that connects the pipe and the discharge path 7 and the fuel distribution pipe including the fuel injection valve can be increased.
Of these, the discharge pipe is particularly preferable because it can be connected to the fuel distribution pipe without passing through the upper and side surfaces of the fuel tank.
[0026]
【The invention's effect】
As described above, according to the motor type fuel pump of the present invention, the motor chamber in which the motor is housed in the pump case,
A motor-type fuel pump that includes a pump unit that performs a pumping action by rotation of the motor, and in which fuel boosted by the pump unit is discharged from the discharge path to the outside through the motor chamber;
A filter formed in a cylindrical shape is disposed on the outer periphery of the motor in the motor chamber, and the motor chamber is formed on the inner side of the filter facing the motor by a cylindrical portion formed of a filter or the like having a filtration performance.
It is divided into the outside of the filter facing the inside of the pump case,
The pump discharge passage connected to the pump chamber of the pump is opened to the inside of the filter and the discharge passage is opened to the outside of the filter, so that the filtration area of the filter is sufficiently large and the overall height and outer diameter of the fuel pump are increased. Thus, a compact motor-type fuel pump can be provided, and further, the fuel flow swirling in the motor chamber can be more positively acted on the cylinder portion of the filter, and clogging of the filter can be further suppressed.
[0027]
According to the present invention, the motor is an outer rotor type brushless motor, and the cylindrical filter is arranged so as to surround the outer periphery of the rotor yoke of the motor, so that a closed motor chamber can be easily formed and the cylindrical filter Can be arranged very easily.
[0028]
Further, the filter is provided with a bottom, a cylindrical portion extending toward the outer periphery of the bottom upwardly, one end continuous to the inside of the filter, the filter discharge passage other end connected to the pump discharge passage, and the filter discharge Since one end of the path is protruded upward from the bottom of the filter, foreign matter inside the filter is prevented from flowing into the pump chamber through the pump discharge path even when used for a long time.
[0029]
Further, the pump housing and the pump cover are fixedly arranged at one end of the pump case, and the bearing holding cover is fixedly arranged at the other end,
The pump chamber of the pump part is formed by the pump housing and the pump cover, and the rotating shaft of the motor is rotatably supported by the bearing holding cover and the pump housing. Since the components are sequentially arranged toward the stop portion and one end and the other end of the pump case may be caulked and connected, the assembly is extremely simple and can be performed in a short time.
[0030]
Furthermore, the pump cover is provided with a pump suction path toward the pump chamber and a discharge path connected to the outside of the annular filter, so that the fuel pump is disposed in the fuel tank from below the fuel ink. It is suitable as a fuel pump of the fuel supply arrangement.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a motor type fuel pump according to the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the motor type fuel pump according to the present invention.
FIG. 3 is a simplified diagram showing a first example of the arrangement of a conventional motor, pump, and filter.
FIG. 4 is a simplified diagram showing a second example of the arrangement of a conventional motor, pump, and filter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump housing 2 Pump cover 3 Bearing holding cover 7 Discharge path 8 Motor chamber 10 Rotor yoke 12 Rotating shaft F Filter K Pump case

Claims (5)

The pump case (K) includes a motor chamber (8) in which the motor M is accommodated, and a pump part (P) that performs a pumping action by the rotation of the motor, and the fuel is pressurized by the pump part (P). In the motor type fuel pump in which is discharged from the discharge passage (7) to the outside through the motor chamber (8),
The filter (F) formed in a cylindrical shape is arranged on the outer periphery of the motor (M) in the motor chamber (8), and the motor chamber is formed by a filter (F) having a filtration performance or the like. The inner part (F1) of the filter (F) facing the motor (M) by the cylinder part (FD),
It is divided into the outside (F2) of the filter (F) facing the inside (K5) of the pump case (K),
The pump discharge path (6) connected to the pump chamber (4) of the pump (P) is opened to the inner side (F1) of the filter (F) and the discharge path (7) is opened to the outer side (F2) of the filter (F). A motor type fuel pump characterized by opening.   The motor-type fuel pump according to claim 1, wherein the motor is an outer rotor type brushless motor, and the cylindrical filter F is disposed so as to surround an outer periphery of a rotor yoke (10) of the motor. The filter has a bottom part (FA), a cylinder part (FD) extending upward from the outer periphery of the bottom part (FA), one end connected to the inside (F1) of the filter (F), and the other end to the pump discharge path. A filter discharge path (FC) connected to (6), wherein one end of the filter discharge path (FC) protrudes upward from the bottom (FA) of the filter (F). The motor fuel pump according to 1. A pump housing (1) and a pump cover (2) are fixedly arranged at one end (K4) of the pump case, and a bearing holding cover (3) is fixedly arranged at the other end (K2).
The pump chamber (4) of the pump section (P) is formed by the pump housing (1) and the pump cover (2), and the rotating shaft (12) of the motor M is connected to the bearing holding cover (3) and the pump housing (1 The motor type fuel pump according to claim 2, wherein the motor type fuel pump is rotatably supported by the motor.   5. A pump suction path (5) directed into the pump chamber (4) and a discharge path (7) connected to the outside (F2) of the filter (F) are provided in the pump cover. Motor fuel pump.

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