JP2002303219A - Fuel supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a fuel supply system provided with a filter and a pressure regulator compact, and reduce its manufacturing cost. SOLUTION: One end K4 of a pump case K is closed by a pump housing 1 forming a pump chamber 4 and a pump cover 2, and the other end K2 is closed by a bearing holding cover 3 to form a motor chamber 8 in the pump case K. Impellers 25 disposed in the pump chamber 4 are driven by a motor M disposed in the motor chamber 8. With the bearing holding cover 3, a fuel chamber 10B of the pressure regulator R is integrally formed, and a rotation shaft 22 of the motor M is rotatably supported by the bearing holding cover 3 and the pump housing 1. In the motor chamber 8 around the motor M, the cylindrical filter F is disposed to form a filtration chamber A, and a delivery passage 9 is opened from the filtration chamber A outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor type fuel pump having a pump section for sucking and discharging fuel in a pump case, and a motor for driving the pump section to rotate. A pressure regulator that controls the pressure of the discharged fuel to a constant pressure.The fuel supply device pressurizes the fuel in the fuel tank and directs the fuel having a constant fuel pressure to the fuel injection valve. Used for a fuel injection device of an internal combustion engine that supplies the fuel.

[0002]

2. Description of the Related Art In such a fuel supply apparatus, fuel supplied from a fuel pump toward a fuel injection valve contains foreign matters because a fuel metering section controlled by the fuel injection valve is formed with a very small gap. It is required that the fuel be clean and free of fuel. For this purpose, a filter for removing foreign matter in the fuel is installed. Further, the fuel pressure supplied from the fuel pump toward the fuel injection valve must always be maintained at a substantially constant pressure. For this reason, a pressure regulator is disposed on the discharge side of the fuel pump. (In other words, a pressure regulator is required so that the injection amount is uniquely determined by the power supply time to the fuel injection valve.) Then, the fuel pump, the filter, and the pressure regulator have their respective components prepared individually. , They are simply assembled and plumbed. This is disclosed, for example, in JP-A-8-193552.

[0003]

According to such a conventional fuel supply device, it is difficult to make the device itself compact. This requires that a fuel pump, a filter, and a pressure regulator be separately prepared, and the apparatus cannot be reduced to a size smaller than the intrinsic size of these components. Also, it is difficult to reduce the manufacturing cost of the fuel supply device. This is because each part is prepared individually and does not have a common part between each part, and it is necessary to connect those parts to each other by piping,
This is due to the large number of assembly steps.

The fuel supply device according to the present invention has been made in view of the above-mentioned problems, and has a compact fuel supply device including a fuel pump, a filter, and a pressure regulator, reduces the manufacturing cost thereof, and in particular, stores components. It is a primary object of the present invention to provide a fuel supply device having a room space extremely narrower than that of a four-wheeled vehicle and having high compatibility with a motorcycle.

[0005]

According to the present invention, there is provided a fuel supply apparatus comprising, in a pump case, a pump section for pressurizing and discharging fuel and a motor for imparting rotation to the pump section in order to achieve the above object. In the fuel supply device, a pump housing and a pump cover forming a pump chamber are arranged at one end of a pump case, and a bearing holding cover is arranged at the other end of the pump case, and a pump is provided by the bearing holding cover and the pump housing. A motor and a filter are arranged in a motor chamber formed in a case,
A regulator housing that forms a fuel chamber of a pressure regulator is integrally formed with the bearing holding cover, a pump suction passage connected to the pump chamber in the pump cover, and a discharge passage connected to a filtration chamber divided by a filter F in the motor chamber. The first feature is that the fuel chamber of the pressure regulator and the motor chamber are connected via a regulator fuel introduction path.

[0006] In addition to the first feature, the present invention is characterized in that the fuel chamber of the pressure regulator is connected to a filtration chamber in the motor chamber via a regulator fuel introduction path.

According to the present invention, in addition to the first feature, the filter disposed in the motor chamber is arranged in a cylindrical shape so as to surround the outer periphery of the motor, and the filter chamber formed in the motor chamber is formed in a cylindrical shape. Is a third feature.

The present invention has a fourth feature in that, in addition to the third feature, the motor is an outer rotor type brushless motor.

Further, according to the present invention, in addition to the fourth feature,
A fifth feature is that a rotation shaft of the motor is rotatably supported by a bearing holding cover and a pump housing.

Further, according to the present invention, in addition to the first feature, the fuel supply device is attached to a lid member for closing an opening formed below the fuel tank and housed in the fuel tank. A sixth feature is that the pump suction passage is disposed inside the fuel tank via a strainer and the discharge passage is opened to the outside of the fuel tank.

[0011]

According to a first feature of the fuel supply device of the present invention,
Foreign matter contained in the fuel directed to the discharge path is removed by a filter disposed in the motor chamber. The fuel chamber of the pressure regulator is formed integrally with the bearing holding cover. The filter is housed and arranged in the motor chamber constituting the fuel pump, and the fuel chamber of the pressure regulator is formed integrally with the bearing holding cover, so that the size of the fuel pump in the longitudinal and radial directions is not increased, and the number of parts is reduced. It is possible to provide a compact and inexpensive fuel supply device which can be reduced.

According to the second feature of the present invention, since clean fuel from which foreign matter has been removed by the filter is supplied into the fuel chamber of the pressure regulator, the foreign matter does not bite into the valve body of the pressure regulator. .

According to the third feature of the present invention, since the filter is formed in a cylindrical shape, the filter area of the filter can be increased, the storage capacity in the motor chamber is good, and the annular filter chamber is formed. By being formed, the degree of freedom in selecting the opening of the discharge path can be increased.

According to the fourth aspect 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.

According to the fifth 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. Performance can be improved.

According to a sixth feature of the present invention, when the fuel supply device is attached to the lid member, the discharge passage and the pump suction passage provided in the pump cover can be opened downward. The connection between the pump suction path and the fuel tank and the connection pipe between the discharge path and the fuel distribution pipe are excellent.This improves the design flexibility of the fuel pipe when mounting the fuel pump below the fuel tank on a motorcycle. it can.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fuel supply device according to the present invention will be described below with reference to FIG. K is a cylindrical pump case, the other end K2 opens upward through an upper locking step K1, and one end K4 opens downward through a lower locking step K3. Reference numeral 1 denotes a pump housing which is disposed in contact with the lower locking step K3 of the pump case K,
The pump cover 2 is disposed in contact with the lower surface of the pump housing 1, and in this state, the lower end of one end K4 of the pump case K is caulked inward toward the pump cover 2 so that the lower locking step K3 is formed. The pump housing 1 and the pump cover 2 are fixedly arranged on the upper side. Reference numeral 3 denotes a bearing holding cover abutting on the upper locking step K1 of the pump case K, and in this state, the pump case K
The upper end of the other end KC is caulked inward toward the bearing holding cover 3 so that the upper locking step K1 is formed.
The bearing holding cover 3 is fixedly arranged on the upper side. Therefore, the inner side K5 of the pump case K and the pump housing 1
, And a lower surface 3A of the bearing holding cover 3 forms a motor chamber 8 which is closed. A pump chamber 4 is formed between the contact surfaces of the pump housing 1 and the pump cover 2. The pump chamber 4 is formed on the downstream side of the pump suction passage 5 formed on the pump cover 2 and the pump discharge passage 6 formed on the pump housing 1. Is open in the pump chamber 4, and the downstream side of the pump discharge passage 6 is opened in the motor chamber 8.

A pressure regulator R is mounted on the bearing holding cover 3 as follows. 1
Reference numeral 0 denotes a regulator housing which is formed integrally with the bearing holding cover 3 so as to protrude therefrom. A bottomed fuel chamber 10B is integrally formed in the bearing holding cover 3 from its upper end face 10A. 10C is fuel chamber 10B
Is a regulator fuel discharge passage that opens to the outside through a valve seat 10D. In this example, the regulator fuel discharge passage opens outside from the outer periphery of the bearing holding cover 3 through a notch groove K6 provided in the other end K2 of the pump case K. I let it. Reference numeral 11 denotes a valve body which is located on the fuel chamber 10B side and opens and closes a valve seat 10C. The valve body 11 is opened by a first spring S1.
It is urged in a direction away from 0C (the side that opens the valve seat 10C). 12 is the upper end surface 1 of the regulator housing 10
0A, and is a partition such as a diaphragm sandwiched between the upper end face 10A and a cup-shaped cover 13 covering the upper end face 10A.
The upper opening of B is closed and hermetically closed, and the partition body 12 and the cover 13 form the spring chamber 14 separately.
The second spring S is provided in the spring chamber 14.
2 is contracted to press the partition 12 toward the fuel chamber 10B, and the spring force of the second spring S2 is set to be stronger than the spring force of the first spring S1.
In a state in which the fuel pressure does not act on B, the spring force of the second spring S2 acts on the valve body 11 via the partition body 12 and the retainer 15, and the valve body 11 closes and holds the valve seat 10C. . The fuel chamber 10B communicates with the motor chamber 8 by a regulator fuel introduction passage 16, and the regulator fuel introduction passage 16 opens to the lower surface 3A of the bearing holding cover 3 and faces the motor chamber 8. The pressure regulator R mounted on the bearing holding cover 3 as described above can be mounted on the bearing holding cover 3 in advance, or can be mounted after the bearing holding cover 3 is mounted on the other end K2 of the pump case K. Good.

The motor M comprises the following. Reference numeral 20 denotes a rotor yoke having a bottomed cylindrical shape, and a magnet 21 is fixedly disposed on an inner peripheral wall of the rotor yoke 20 by an adhesive or the like, and a rotating shaft 2 penetrating the center of the rotor yoke 20.
2 are integrally fixed. The upper portion of the rotating shaft 22 is rotatably supported via a bearing B on a cylindrical portion 3B that extends downward from the center of the bearing holding cover 3, and the rotating shaft 12
Is rotatably supported by the pump housing 1 via a bearing C. Reference numeral 23 denotes a stator around which an armature coil 24 is wound. The stator 23 is disposed inside the rotor yoke 20 and fixedly disposed outside the cylindrical portion 3B. The motor M formed as described above is housed and arranged in the motor room 8.

The pump section P has an impeller 25 inside the pump chamber 4.
And the lower end of the rotating shaft 22 is engaged with the impeller 25.

According to the above, one end K4 of the pump case K
Is closed by the pump housing 1 and the pump cover 2, the impeller 25 is housed in the pump chamber 4 between the pump housing 1 and the pump cover 2, and the pump portion P is disposed. K2 is closed by the bearing holding cover 3 provided with the pressure regulator R, and the bearing holding cover 3, the pump case K,
A motor M is housed and arranged in a motor chamber 8 formed by the pump housing 1.

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 9 formed in the pump cover 2 is provided.
Are stored and arranged. The filter F is formed with a cylindrical tubular portion FD (the tubular portion FD is formed by a net having a filtering function or the like) upward from the disc-shaped bottom portion FA.
At its upper end, a fitting flange portion FB that fits inside K5 of the pump case K is formed, and a pump discharge passage FC is formed through the bottom portion FA. The filter F is disposed in the motor chamber 8. Specifically, the bottom part FA of the filter F is disposed on the upper surface 1 </ b> A of the pump housing 1, and the cylindrical part FD is disposed between the outer periphery of the rotor yoke 20 of the motor M. And the fitting flange portion F
B is fitted to the inner side K5 of the pump case K. According to the above description, the filtration chamber A is formed in the outer periphery of the cylindrical portion FD of the filter F and in the motor chamber 8 in the inside K5 of the pump case K, and the upstream side of the discharge passage 9 provided in the pump cover 2 It is connected to the filtration chamber A, and the downstream side opens to the outside. In this state, the pump discharge path 6 formed in the pump housing 1 is connected to the pump discharge path FC formed in the bottom FA of the filter F.

Next, the operation will be described. When power is supplied to the amateur coil 14 and the rotor yoke 20 rotates, the rotation causes the impeller 25 to rotate via the rotating shaft 22 and the fuel in the fuel source (not shown) to be pumped through the pump suction passage 5 into the pump chamber 4. The fuel sucked into the pump chamber and pressurized in the pump chamber 4 is supplied to the motor chamber 8 through the pump discharge path 6 and the FC.
It is discharged inside. When the fuel is filled in the motor chamber 8, foreign matter contained in the fuel is removed by the cylinder FD of the filter F disposed in the motor chamber 8, and the fuel is formed outside the cylinder FD. Clean fuel is supplied to the filtration chamber A to be cleaned.

On the other hand, the pressurized fuel in the motor chamber 8 is
The fuel is supplied into the fuel chamber 10B of the pressure regulator R via the regulator fuel introduction passage 16. When the fuel pressure in the fuel chamber 10B rises above a set constant value, the partition 12 is moved by the second spring. It is displaced toward the spring chamber 14 against the spring force of S2. According to this, the valve body 11 is moved by the spring force of the first spring S1.
The valve seat 10D is opened corresponding to the displacement of 2 and the increased fuel pressure in the fuel chamber 10B is discharged to the outside through the regulator fuel discharge passage 10C together with the fuel, thereby reducing the fuel pressure in the motor chamber 8 to a predetermined value. Can be adjusted to the set pressure. Incidentally, the pressure regulating action of the pressure regulator R is the same as that of the conventional one.

As described above, the filter chamber A formed in the motor chamber 8 from the inside of the filter F to the outside of the filter F via the cylindrical portion FD is provided with the clean pressure regulated to a predetermined pressure. A suitable fuel supply device for a fuel injection device can be provided by supplying a suitable fuel and supplying the fuel to a fuel injection valve (not shown).

Here, according to the fuel supply device of the present invention, the filter F is disposed in the motor chamber 8 and the motor chamber 8
Since the fuel flowing from the discharge passage 9 to the discharge passage 9 is filtered by the filter F, all foreign substances generated by the pump chamber 4 and the motor M can be completely removed. The fuel can be supplied to the valve, and a fuel supply device particularly suitable for a fuel injection device can be provided.

Since the filter F is housed and arranged in the motor chamber 8 and the fuel chamber 10B of the pressure regulator R is formed integrally with the bearing holding cover 3, the fuel supply device can be made compact. As a result, the manufacturing cost can be greatly reduced. That is, storing the filter F in the motor chamber 8 covers the outer periphery of the filter F and eliminates the need for a filter case having a suction path and a discharge path, thereby eliminating the need for a filter case. Thus, a compact fuel pump can be provided correspondingly, and a reduction in parts cost and a reduction in assembly cost can be achieved corresponding to the reduction in the number of parts.
Further, according to the fact that the fuel chamber 10B of the pressure regulator R is formed integrally with the bearing holding cover 3, the regulator housing 10 for forming the fuel chamber 10B of the pressure regulator R (in the present invention, the regulator housing 10 is a bearing holding cover) 3), it is possible to provide a compact fuel supply device corresponding to the need for a special regulator housing, and to reduce the number of parts.
The reduction in manufacturing costs was achieved by reducing the number of assembly steps. Further, since the filter F and the pressure regulator R are integrally disposed in the pump case K, piping such as a rubber pipe for connecting the filter F, the fuel pump, and the pressure regulator R is not required.

The filter F disposed in the motor chamber 8 is formed in a cylindrical shape and disposed so as to surround the outer periphery of the motor M. The filter chamber A is formed in a cylindrical shape along the longitudinal axis of the rotating shaft 22. According to the formation, the filter F can be provided without increasing the overall height and outer diameter of the fuel supply device. In addition, since the portion of the filter F having particularly the filtering performance is formed by the cylindrical tubular portion FD, the filtering area can be increased, and the good filtering performance can be maintained over a long period of time. Further, according to the fact that the filter F is formed by the cylindrical tubular portion FD and is disposed in the motor chamber 8, the rotating fuel flow generated by the rotation of the motor M collides with the tubular portion FD. The foreign matter flows into the filtration chamber A from the FD. When foreign matter adheres to the cylindrical part FD of the inner part F1 of the filter F, the foreign matter is separated by the rotating fuel flow, and the foreign matter adheres to the cylindrical part FD. The occurrence of clogging is suppressed. Therefore, good filtration performance can be maintained over a long period. Furthermore, according to the fuel supply device of the present invention, the assemblability can be improved. That is, first, the pump case K
The pump housing 1 and the pump cover 2 are arranged toward the lower locking step K3, and in this state, one end K4 of the pump case K is swaged inward toward the pump cover 2. At this time, an impeller 25 is provided in the pump chamber 4 formed by the pump housing 1 and the pump cover 2.
Are rotatably accommodated. Secondly, 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 portion FA of the filter F is arranged on the upper surface 1A of the pump housing 1. You. Thirdly, the bearing holding cover 3 to which the motor M and the pressure regulator R are attached is disposed on the upper locking step K1 of the pump case K. At this time, the lower part of the rotating shaft 22 of the motor M is the bearing of the pump housing 1. C
And the rotor yoke 20 is engaged with the impeller 25.
The motor M formed by the above-described method is used to control the cylindrical portion F of the filter F.
D is disposed inside the motor chamber 8. In this state, the other end K2 of the pump case K is swaged inward toward the bearing holding cover 3. The assembly of the fuel supply device is completed as described above. The components are simply arranged in order toward the lower locking step K3 and the upper locking step K1 of the pump case K, and one end K4 and the other end of the pump case K are arranged. Since it is sufficient to caulk K2, the assembly can be performed extremely simply and in a short time.

Further, a rotor yoke 20 is provided on the outer periphery as a motor.
According to the use of the outer rotor type brushless motor, the outer circumference of the rotor yoke 20 and the pump case K
The inner side K5 can form the motor chamber 8 having an annular space, which is suitable for disposing the cylindrical filter F. Further, according to the use of the brushless motor, it is not necessary to open a recess for accommodating a brush or a pick tail on the lower surface 3A of the bearing holding cover 3, so that the closed motor chamber 8 can be easily formed. (A part of the motor chamber 8 is formed by the lower surface of the bearing holding cover 3)

Further, since the rotating shaft 22 of the outer rotor type brushless motor is rotatably supported by the bearing holding cover 3 and the pump housing 1, the assembly of the rotating shaft 22 can be improved. That is, first, an upper fitting hole K8 formed above the upper locking step K1 at one end K2 of the pump case K, and the other end K2 of the pump case K
The upper fitting hole K9 formed above the upper locking step K1 is extremely accurately concentrically machined with a lathe or the like based on the axis of the pump case K. Second, the outer peripheral portion 3C of the bearing holding cover 3 fitted and disposed in the upper fitting hole K9 and the bearing hole B1 that supports the bearing B are very accurately concentrically machined. This is because the outer peripheral portion 3C and the bearing hole B1
This is because lathe processing can be performed based on either one of them. Third, the outer peripheral portion 1B of the pump housing 1 fitted in the lower fitting hole K8 and the bearing hole C for supporting the bearing C are provided.
1 is very accurately concentrically machined. This is for the same reason as above. According to the above, since the concentricity of all the components involved in the rotation axis of the rotation shaft 22 can be manufactured with extremely high precision, the rotation shaft 22 can be easily assembled and supported without causing rotational runout.

Another embodiment will be described with reference to FIG. Only the parts different from those in FIG. 1 will be described, and the description of the same structural parts will be omitted by using the same reference numerals. The cylindrical portion 3D slightly extends from the lower surface 3A of the bearing holding cover 3 into the motor chamber 8. This cylindrical portion 3D is provided with
And between the outer periphery of the rotor yoke 20 of the motor M and the inner side K5 of the pump case K. Further, an annular portion FE is formed on the upper portion of the filter F, and the inside of the annular portion FE is fitted and arranged outside the cylindrical portion 3D. According to the above, the filtration chamber A is formed by the outer side F2 of the filter F and the inner side K5 of the pump case K, and the filtration chamber A is formed on the lower surface 3A of the bearing holding cover 3.
Reaches the annular groove 3E formed in the hole. The upstream side of the regulator fuel introduction passage 16 opening to the fuel chamber 10B of the pressure regulator R is connected to the filtration chamber A via the annular groove 3E. According to the above, the fuel introduced into the fuel chamber 10B is supplied with the clean fuel from which the foreign matter in the filtration chamber A has been removed, so that the foreign matter between the valve seat 10D and the valve body 11 is not caught. In addition, it is possible to suppress the damage to the partition 12 when the partition 12 is formed of a thin rubber material, and thus it is possible to perform stable pressure regulation over a long period of time.

FIG. 3 shows that the fuel supply device is a fuel tank T
A specific example to be mounted on the pod is shown. In motorcycles,
When the fuel pump is housed in the fuel pump and the fuel tank, the fuel pump is often disposed in the fuel tank T through an opening TA formed below the fuel tank, in view of the appearance of the fuel tank. Reference numeral 30 denotes a lid member that removably closes the opening TA of the fuel tank T. The fuel supply device includes a support arm 30A that projects upward from the lid member 30 and includes a filter F and a pressure regulator R. Is attached by the fastening band 32. At this time, a pump suction passage 5 and a discharge passage 9 project from the lower end of the fuel supply device.
Among them, a strainer 31 is mounted on the pump suction path 5, and the strainer 31 is arranged so as to open into the fuel tank T. On the other hand, the discharge path 9 is connected to a discharge path 30B provided in the lid member 30, and the downstream of the discharge path 30B opens outward from the bottom of the fuel tank T. Reference numeral 33 denotes a fastening bolt for fastening the lid member 30 to the fuel tank T, and reference numeral 34 denotes an O-ring for liquid-tightly sealing the lid member 30 and the opening TA. According to the above, the fuel supply device having the filter F and the pressure regulator R therein is mounted on the support arm 30A of the lid member 30 and the strainer 31 is mounted on the pump suction passage 1. Is inserted into the fuel tank T via the opening TA, and the opening T
A can be closed, so the fuel tank T of the fuel supply device
It is very easy to mount the device on the device and can be performed in a short time. Accordingly, a fuel supply device suitable for a motorcycle can be provided.

[0033]

As described above, according to the fuel supply device of the present invention, the pump housing and the pump cover forming the pump chamber are disposed at one end of the pump case, and the bearing holding cover is disposed at the other end of the pump case. Place,
A motor and a filter are arranged in a motor chamber formed in a pump case by the bearing holding cover and the pump housing, while a regulator housing that forms a fuel chamber of a pressure regulator is integrally formed with the bearing holding cover, The pump cover is provided with a pump suction path connected to the pump chamber and a discharge path connected to the filtration chamber divided by the filter F in the motor chamber. Further, the fuel chamber of the pressure regulator and the motor chamber are connected via the regulator fuel introduction path. Since the communication has been made, foreign matter generated by the pump chamber and the motor can be completely removed, and extremely clean fuel can be supplied to the fuel injection valve. Further, a fuel supply device having a filter and a pressure regulator can be provided extremely compactly and inexpensively, and is particularly suitable as a fuel supply device for a motorcycle having a small storage space. Further, piping such as a rubber pipe for specially communicating the fuel pump, the filter, and the pressure regulator is not required. Further, according to the fact that the fuel chamber of the pressure regulator is communicated with the filtration chamber in the motor chamber via the regulator fuel introduction path, clogging of the valve body and the valve seat and damage of the partition body can be suppressed, and for a long period of time. A stable pressure adjustment operation can be performed. Also, according to the filter disposed in the motor chamber, which is formed in a cylindrical shape so as to surround the outer periphery of the motor, and the filter chamber formed in the motor chamber is formed in a cylindrical shape, the overall height and outer diameter of the fuel supply device are reduced. Of the filter can be suppressed, and the filtration area of the filter can be increased, and foreign matter attached to the filter does not bite into the filter, so that stable filtration performance can be maintained for a long period of time. Further, the use of the outer rotor type brushless motor as the motor is suitable for forming a closed motor chamber, and a cylindrical motor chamber can be formed, which is convenient for disposing a cylindrical filter. Further, since the rotation shaft of the motor is rotatably supported by the bearing holding cover and the pump housing, the assemblability of the rotation shaft can be improved and the rotation of the rotation shaft can be suppressed. Furthermore, the fuel supply device is attached to a lid member that closes an opening formed below the fuel tank and is accommodated in the fuel tank, and the pump suction path is inserted into the fuel tank via a strainer. According to the communication and the opening of the discharge path to the outside of the fuel tank, the mountability to the fuel tank for a motorcycle can be particularly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a fuel supply device of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the fuel supply device of the present invention.

FIG. 3 is a longitudinal sectional view showing an embodiment in which the fuel supply device of the present invention is mounted on a fuel tank.

[Explanation of symbols]

 Reference Signs List 1 pump housing 2 pump cover 4 pump chamber 5 pump suction path 8 motor chamber 9 discharge path 10B fuel chamber 16 regulator fuel introduction path 22 rotation axis A filtration chamber K pump case F filter M motor R pressure regulator

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 69/00 340 F02M 69/00 340T H02K 21/22 H02K 21/22 M

Claims (6)

[Claims] 1. A pump unit that pressurizes and discharges fuel in a pump case, a motor that imparts rotation to the pump unit,
A pump housing 1 and a pump cover 2 forming a pump chamber 4 are arranged at one end K4 of a pump case K, and a bearing holding cover 3 is arranged at the other end K2 of the pump case K. A motor M and a filter F are arranged in a motor chamber 8 formed in the pump case K by the bearing holding cover and the pump housing 1, while a regulator housing for forming a fuel chamber 10B of the pressure regulator R in the bearing holding cover. While integrally forming 10,
A pump suction passage 5 connected to the pump chamber 4 in the pump cover 2
And a discharge passage 9 connected to the filtration chamber A divided by a filter F in the motor chamber M. Further, the fuel chamber 10B of the pressure regulator R and the motor chamber 8 are connected via the regulator fuel introduction path 16. A fuel supply device, characterized in that: 2. The pressure regulator fuel chamber 10B is connected to a filtration chamber A in a motor chamber 8 through a regulator fuel introduction passage 16.
The fuel supply device as described in the above. 3. The filter F disposed in the motor chamber is arranged in a cylindrical shape so as to surround the outer periphery of the motor M,
2. The fuel supply device according to claim 1, wherein the filtration chamber A formed in the motor chamber 8 is formed in a cylindrical shape. 4. The fuel supply device according to claim 3, wherein the motor is an outer rotor type brushless motor. 5. The fuel supply device according to claim 4, wherein the rotating shaft of the motor is rotatably supported by the bearing holding cover and the pump housing. 6. The fuel supply device is attached to a lid member 30 that closes an opening TA formed below the fuel tank T, and is housed and disposed in the fuel tank T. The fuel supply device according to claim 1, wherein the fuel supply device communicates with the inside of the fuel tank (T) via the first opening (31), and the discharge path (9) is opened to the outside of the fuel tank (T).