JP3909486B2 - Fuel supply device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a motor type fuel pump having a pump part that sucks and discharges fuel in a pump case and a motor that rotationally drives the pump part, and a fuel pressure that is boosted and discharged from the fuel pump is constant. A fuel supply device comprising a pressure regulator for controlling the pressure, the fuel supply device boosts the fuel in the fuel tank and supplies the fuel having a constant fuel pressure toward the fuel injection valve. Used for injection devices.
[0002]
[Prior art]
In such a fuel supply device, the fuel supplied from the fuel pump toward the fuel injection valve is clean and does not contain foreign substances because the fuel metering portion controlled by the fuel injection valve is formed with a very small gap. Since it is required to be a fuel, a filter for removing foreign substances in the fuel is installed for this purpose.
Further, the fuel pressure supplied from the fuel pump toward the fuel injection valve must be maintained at a substantially constant pressure. For this purpose, 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 energization time of the fuel injection valve.)
The fuel pump, the filter, and the pressure regulator are obtained by individually preparing each component and simply assembling the components.
This is shown, for example, in Japanese Patent Laid-Open No. 8-193552.
[0003]
[Problems to be solved by the invention]
According to such a conventional fuel supply device, it is difficult to make the device itself compact.
In this case, it is necessary to prepare a fuel pump, a filter, and a pressure regulator individually, and it is impossible to assemble the apparatus below the size originally possessed by these components.
In addition, it is difficult to reduce the manufacturing cost of the fuel supply device.
This is attributed to the fact that each part is prepared individually and does not have a common part between each part, and that each part needs to be connected to each other by piping, resulting in a large number of assembly steps. .
[0004]
The fuel supply apparatus according to the present invention is made in view of such a problem, and the fuel supply apparatus including a fuel pump, a filter, and a pressure regulator is compactly combined and the manufacturing cost is reduced. The main object of the present invention is to provide a fuel supply device that is extremely narrow compared to a four-wheeled vehicle and that is highly compatible with a motorcycle.
[0005]
[Means for solving the problems]
In order to achieve the above object, the fuel supply apparatus according to the present invention is a fuel supply apparatus including a pump unit that boosts and discharges fuel in a pump case, and a motor that imparts rotation to the pump unit.
A pump housing and a pump cover forming a pump chamber are arranged at one end of the pump case, and a bearing holding cover is arranged at the other end of the pump case,
A motor and a filter are arranged in a motor chamber formed in the pump case by the bearing holding cover and the pump housing;
On the other hand, a regulator housing that forms a fuel chamber for the pressure regulator is formed integrally with the bearing holding cover, a pump suction passage that is connected to the pump chamber in the pump cover, and a discharge passage that is connected to a filtration chamber divided by a filter F in the motor chamber. And the fuel chamber of the pressure regulator and the motor chamber are connected via the regulator fuel introduction path.
[0006]
In addition to the first feature, the present invention has a second feature that the fuel chamber of the pressure regulator is connected to the filter chamber in the motor chamber via the regulator fuel introduction passage.
[0007]
According to the present invention, in addition to the first feature, the filter disposed in the motor chamber is formed in a cylindrical shape so as to surround the outer periphery of the motor, and the filtration chamber formed in the motor chamber is formed in a cylindrical shape. This is the third feature.
[0008]
In addition to the third feature, the present invention has a fourth feature that the motor is an outer rotor type brushless motor.
[0009]
Furthermore, in addition to the fourth feature, the fifth feature of the present invention is that the rotation shaft of the motor is rotatably supported by a bearing holding cover and a pump housing.
[0010]
Furthermore, in addition to the first feature, the present invention attaches the fuel supply device to a lid member that closes an opening formed below the fuel tank, and stores and arranges the fuel supply device in the fuel tank.
A sixth feature is that the pump suction path is connected to the inside of the fuel tank via a strainer, and the discharge path is opened toward the outside of the fuel tank.
[0011]
[Action]
According to the first feature of the fuel supply apparatus of the present invention, the foreign matter contained in the fuel traveling toward 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 that constitutes the fuel pump, and the fuel chamber of the pressure regulator is formed integrally with the bearing holding cover. Therefore, the filter does not increase in size in the longitudinal direction and radial direction of the fuel pump, and the number of parts is reduced. A fuel supply device that can be reduced and that is compact and inexpensive can be provided.
[0012]
According to the second feature of the present invention, clean fuel from which foreign matter has been removed by the filter is supplied into the fuel chamber of the pressure regulator, so that foreign matter does not get caught in the valve body portion of the pressure regulator.
[0013]
According to the third feature of the present invention, since the filter is formed in a cylindrical shape, it is possible to increase the filtration area of the filter and to have good storage in the motor chamber and to form an annular filtration chamber. As a result, the degree of freedom in selecting the opening of the discharge path can be increased.
[0014]
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.
[0015]
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, so that the assembly workability is improved. it can.
[0016]
Further, according to the sixth aspect of the present invention, when the fuel supply device is attached to the lid member, the discharge passage provided in the pump cover and the pump suction passage can be opened downward. The connection to the inside of the fuel tank and the connection pipe between the discharge path and the fuel distribution pipe are excellent, and in a motorcycle, when the fuel pump is mounted below the fuel tank, the design flexibility of the fuel pipe can be improved.
[0017]
【Example】
An embodiment of the fuel supply apparatus 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.
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. 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, and the downstream side of the pump discharge path 6 opens into the motor chamber 8.
[0018]
A pressure regulator R is mounted on the bearing holding cover 3 as follows.
Reference numeral 10 denotes a regulator housing that is integrally formed so as to protrude from the bearing holding cover 3. A bottomed fuel chamber 10 </ b> B is integrally recessed from the upper end surface 10 </ b> A into the bearing holding cover 3.
10C is a regulator fuel discharge passage that opens from the fuel chamber 10B to the outside through the valve seat 10D. In this example, a notch groove K6 provided in the other end K2 of the pump case K from the outer periphery of the bearing holding cover 3 is provided. And opened to the outside.
Reference numeral 11 denotes a valve body that is on the fuel chamber 10B side and opens and closes the valve seat 10C. The valve body 11 is attached in a direction away from the valve seat 10C by the first spring S1 (the side that opens the valve seat 10C). Be forced.
Reference numeral 12 denotes a partition body such as a diaphragm which is disposed on the upper end surface 10A of the regulator housing 10 and is sandwiched between the upper end surface 10A and a cup-shaped cover 13 covering the upper end surface 10A. The opening is closed and sealed, and the spring chamber 14 is partitioned by the partition 12 and the cover 13.
The second spring S2 is contracted in the spring chamber 14 to press the partition 12 toward the fuel chamber 10B, and the spring force of the second spring S2 is set stronger than the spring force of the first spring S1. Therefore, in a state where fuel pressure does not act in the fuel chamber 10B, 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 is a valve seat. 10C is closed and held.
The fuel chamber 10B is in communication with the motor chamber 8 via a regulator fuel introduction path 16, and the regulator fuel introduction path 16 opens to the lower surface 3A of the bearing holding cover 3 and faces the motor chamber 8.
The pressure regulator R to be mounted on the bearing holding cover 3 as described above may be installed on the bearing holding cover 3 in advance or after the bearing holding cover 3 is mounted on the other end K2 of the pump case K. Good.
[0019]
The motor M consists of the following.
Reference numeral 20 denotes a rotor yoke having a bottomed cylindrical shape. A magnet 21 is fixedly disposed on the inner peripheral wall of the rotor yoke 20 with an adhesive or the like, and is integrally fixed to a rotary shaft 22 penetrating the center of the rotor yoke 20.
The upper part of the rotary shaft 22 is rotatably supported via a bearing B on a cylindrical portion 3B directed downward from the center of the bearing holding cover 3, and the lower part of the rotary shaft 12 is rotated by the pump housing 1 via a bearing C. It is supported freely.
Reference numeral 23 denotes a stator around which an armature coil 24 is wound. The stator 23 is arranged inside the rotor yoke 20 and fixedly arranged outside the cylindrical portion 3B. The motor M formed as described above is accommodated in the motor chamber 8.
[0020]
The pump part P houses and arranges the impeller 25 in the pump chamber 4, and the lower end of the rotating shaft 22 is engaged with the impeller 25.
[0021]
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 25 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 having the pressure regulator R, and the motor M is placed in the motor chamber 8 formed by the bearing holding cover 3, the pump case K, and the pump housing 1. Is stored and arranged.
[0022]
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 accommodated in the motor chamber 8.
The filter F is formed with a cylindrical tube portion FD (this tube portion FD is formed by a net or the like having a filtering function) upward from the disc-shaped bottom portion FA, and an inner side of the pump case K at the upper end thereof. A fitting flange FB to be fitted to K5 is formed and a pump 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 1A of the pump housing 1 and the cylindrical portion FD is spaced from the outer periphery of the rotor yoke 20 of the motor M. And the fitting flange portion FB is fitted and arranged on the inner side K5 of the pump case K. According to the above, the filtration chamber A is formed in the outer periphery of the cylinder portion FD of the filter F and in the motor chamber 8 of the inner side K5 of the pump case K, and the upstream side of the discharge passage 9 provided in the pump cover 2 is this side. Connected to the filtration chamber A, the downstream side opens to the outside.
In this state, the pump discharge path 6 that is drilled in the pump housing 1 is connected to the pump discharge path FC that is drilled in the bottom FA of the filter F.
[0023]
Next, the operation will be described.
When the rotor yoke 20 is rotated by supplying power to the amateur coil 14, this rotation causes the impeller 25 to rotate via the rotating shaft 22, 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 and pressurized in the pump chamber 4 is discharged into the motor chamber 8 through the pump discharge passage 6 and FC.
When the fuel is filled in the motor chamber 8, foreign matters contained therein are removed from the fuel by the tube portion FD of the filter F disposed in the motor chamber 8, and formed outside the tube portion FD. A clean fuel is supplied to the filtration chamber A.
[0024]
On the other hand, the pressurized fuel in the motor chamber 8 is supplied into the fuel chamber 10B of the pressure regulator R via the regulator fuel introduction path 16, and the fuel pressure in the fuel chamber 10B is set to a constant value. If it rises exceeding it, the division body 12 will be displaced to the spring chamber 14 side against the spring force of 2nd spring S2.
According to this, the valve body 11 opens the valve seat 10D corresponding to the displacement of the partition body 12 by the spring force of the first spring S1, so that the increased fuel pressure in the fuel chamber 10B together with the fuel is regulated by the regulator fuel discharge passage 10C. The fuel pressure in the motor chamber 8 can be adjusted to a predetermined set pressure.
Note that the pressure regulating action itself of the pressure regulator R is the same as the conventional one.
[0025]
According to the above, clean fuel adjusted to a predetermined pressure is present in the filter chamber A, which is in the motor chamber 8 and is formed from the inside of the filter F to the outside of the filter F through the cylinder portion FD. A fuel supply device suitable for the fuel injection device can be provided by supplying the fuel to a fuel injection valve (not shown).
[0026]
Here, according to the fuel supply device according to the present invention, the filter F is disposed in the motor chamber 8 and the fuel from the motor chamber 8 toward the discharge passage 9 is filtered by the filter F. All the generated foreign matters can be completely removed, and extremely clean fuel can be supplied from the discharge passage 9 toward the fuel injection valve. In particular, a fuel supply device suitable for the fuel injection device can be provided. .
[0027]
According to the fact that the filter F is accommodated in the motor chamber 8 and that the fuel chamber 10B of the pressure regulator R is formed integrally with the bearing holding cover 3, the fuel supply device can be compactly integrated and The manufacturing cost can be greatly reduced.
In other words, the filter F is accommodated in the motor chamber 8 because the filter case that covers the outer periphery of the filter F and includes the suction path and the discharge path is unnecessary, and according to this, the filter case is unnecessary. Thus, a compact fuel pump can be provided correspondingly, and the parts cost and assembly cost can be reduced corresponding to the reduced number of parts.
Further, since the fuel chamber 10B of the pressure regulator R is integrally formed with the bearing holding cover 3, the regulator housing 10 for forming the fuel chamber 10B of the pressure regulator R (the regulator housing 10 is a bearing holding cover in the present invention). 3), which can be provided with a compact fuel supply device corresponding to the fact that a special regulator housing is not required, and the number of parts and assembly man-hours can be reduced. The manufacturing cost can be reduced.
Further, when the filter F and the pressure regulator R are integrally disposed in the pump case K, piping such as a rubber pipe connecting the filter F, the fuel pump, and the pressure regulator R becomes unnecessary.
[0028]
Further, the filter F disposed in the motor chamber 8 is formed in a cylindrical shape so as to surround the outer periphery of the motor M, and the filtration chamber A is formed in a cylindrical shape along the longitudinal axis of the rotary shaft 22. According to this, the filter F can be equipped without increasing the overall height and outer diameter of the fuel supply device.
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. When the foreign matter adheres to the cylindrical portion FD of the inner F1 of the filter F, the foreign matter is peeled off by the rotating fuel flow, and the foreign matter adheres to the cylindrical portion FD. Clogging is prevented.
Therefore, good filtration performance can be maintained over a long period of time.
Furthermore, according to the fuel supply device 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 25 is housed 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
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 side of the rotating shaft 22 of the motor M is the bearing of the pump housing 1. The motor M formed by the rotor yoke 20 and the like is inserted in the motor chamber 8 inside the cylindrical portion FD of the filter F, while being inserted into the C and engaged with the impeller 25.
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 fuel supply device. The components 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 and the other end of the pump case K are disposed. Since K2 only has to be caulked, the assembly is very simple and can be performed in a short time.
[0029]
Further, when the outer rotor type brushless motor having the rotor yoke 20 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 20 and the inner side K5 of the pump case K, so that it is cylindrical. It is suitable for disposing the filter F.
In addition, the use of the brushless motor makes it easy to form the closed motor chamber 8 because it is not necessary to open a recess for storing the brush or pick tail on the lower surface 3A of the bearing holding cover 3 in particular. (A part of the motor chamber 8 is formed by the lower surface of the bearing holding cover 3)
[0030]
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, firstly, an upper fitting hole K8 formed above one end K2 of the pump case K above the upper locking step K1, and above the upper locking step K1 at the other end K2 of the pump case K. The upper fitting hole K9 formed in the upper and lower fitting holes K9 is very accurately concentrically processed by a lathe or the like with reference to the axis of the pump case K.
Secondly, 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 supporting the bearing B are processed with high accuracy.
This is because the lathe can be processed on the basis of either the outer peripheral portion 3C or the bearing hole B1.
Thirdly, the outer peripheral portion 1B of the pump housing 1 fitted and disposed in the lower fitting hole K8 and the bearing hole C1 for supporting the bearing C are processed to be very concentric.
This is for the same reason as above.
According to the above, since the concentricity of all the components related to the rotation axis of the rotation shaft 22 can be manufactured with extremely high accuracy, the rotation shaft 22 can be easily assembled and supported without causing any runout.
[0031]
Another embodiment will be described with reference to FIG.
Only the parts different from FIG. 1 will be described, and the same structural parts are denoted by the same reference numerals, and the description thereof will be omitted.
The cylindrical portion 3D slightly extends from the lower surface 3A of the bearing holding cover 3 toward the inside of the motor chamber 8.
The cylinder portion 3D is disposed in the motor chamber 8 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 disposed outside the cylinder 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. The filtration chamber A is formed in the annular groove 3E formed in the lower surface 3A of the bearing holding cover 3. Reach.
The upstream side of the regulator fuel introduction passage 16 opened 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, since the fuel introduced into the fuel chamber 10B is supplied with clean fuel from which the foreign matter in the filtration chamber A has been removed, foreign matter is caught between the valve seat 10D and the valve body 11. In addition, damage to the partition 12 when the partition 12 is formed of a thin rubber material can be suppressed, and stable pressure regulation can be performed over a long period of time.
[0032]
FIG. 3 shows a specific example in which the fuel supply device is attached to the fuel tank T.
When the motorcycle is housed in the fuel pump and the fuel tank, the fuel pump is often disposed in the fuel tank T from the opening TA formed in the lower part of the fuel tank in view of the fuel tank.
Reference numeral 30 denotes a lid member that detachably closes the opening TA of the fuel tank T, and the fuel supply device provided with a filter F and a pressure regulator R on the support arm 30A protruding upward from the lid member 30. Is attached by the fastening band 32.
At this time, the pump suction path 5 and the discharge path 9 protrude from the lower end of the fuel supply device, and a strainer 31 is attached to the pump suction path 5, and the strainer 31 opens into the fuel tank T. Arranged.
On the other hand, the discharge path 9 is connected to a discharge path 30 </ b> B provided in the lid member 30, and the downstream of the discharge path 30 </ b> B 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 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 inside is mounted on the support arm 30A of the lid member 30, and the strainer 31 is mounted on the pump suction passage 1, and in this state, the fuel supply device Can be inserted into the fuel tank T through the opening TA and the opening TA can be closed by the lid member 30, so that the fuel supply device can be attached to the fuel tank T very easily and in a short time. Can do.
Therefore, a fuel supply device suitable for a motorcycle can be provided.
[0033]
【The invention's effect】
As described above, according to the fuel supply device of the present invention, the pump housing forming the pump chamber and the pump cover are arranged at one end of the pump case, and the bearing holding cover is arranged at the other end of the pump case,
A motor and a filter are arranged in a motor chamber formed in the pump case by the bearing holding cover and the pump housing;
On the other hand, a regulator housing that forms a fuel chamber for the pressure regulator is formed integrally with the bearing holding cover, a pump suction passage that is connected to the pump chamber in the pump cover, and a discharge passage that is connected to the filtration chamber divided by the filter F in the motor chamber. In addition, the fuel chamber of the pressure regulator and the motor chamber are connected via the regulator fuel introduction passage, so that foreign matter generated by the pump chamber and the motor can be completely removed, and extremely clean fuel is used as the fuel injection valve. Can be supplied towards.
In addition, a fuel supply device having a filter and a pressure regulator can be provided in a very compact and inexpensive manner, and is particularly suitable as a fuel supply device for a motorcycle having a small storage space.
In addition, piping such as a rubber pipe for particularly connecting a fuel pump, a filter, and a pressure regulator is unnecessary.
In addition, when the pressure regulator fuel chamber is connected to the motor chamber filtration chamber via the regulator fuel introduction passage, clogging of the valve body and valve seat, and damage to the compartment can be suppressed, and for a long time. Stable pressure regulation can be performed.
Further, according to the fact that the filter disposed in the motor chamber 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 Can be prevented, and the filtration area of the filter can be increased, and foreign matter adhering to the filter does not bite into the filter, so that stable filtration performance can be maintained over a long period of time. Further, when the motor is an outer rotor type brushless motor, it is suitable for forming a hermetically sealed motor chamber, and a cylindrical motor chamber can be formed, which is convenient for disposing a cylindrical filter.
Furthermore, if the rotating shaft of the motor is rotatably supported by the bearing holding cover and the pump housing, the assembling property of the rotating shaft can be improved and the swinging of the rotating 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.
By connecting the pump suction path to the inside of the fuel tank via the strainer and opening the discharge path to the outside of the fuel tank, it is possible to improve the attachment property to a fuel tank for a motorcycle.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a fuel supply apparatus of the present invention.
FIG. 2 is a longitudinal sectional view showing a second embodiment of the fuel supply apparatus 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]
1 Pump housing
2 Pump cover
4 Pump room
5 Pump suction passage
8 Motor room
9 Discharge path
10B Fuel chamber
16 Regulator Letter Fuel Introduction Route
22 Rotating shaft
A Filtration chamber
K pump case
F filter
M motor
R pressure regulator

Claims (6)

In a fuel supply apparatus comprising: a pump unit that boosts and discharges fuel in a pump case; and a motor that imparts rotation to the pump unit.
The pump housing 1 and the pump cover 2 that form the pump chamber 4 are arranged at one end K4 of the pump case K, and the 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;
On the other hand, a regulator housing 10 for forming a fuel chamber 10B for the pressure regulator R is integrally formed on the bearing holding cover, and the pump cover 2 is separated from the pump chamber 4 by the pump cover 2 and the filter F in the motor chamber M. And a discharge passage 9 connected to the filtration chamber A, and the fuel chamber 10B of the pressure regulator R and the motor chamber 8 are connected via a regulator fuel introduction passage 16. The fuel supply apparatus according to claim 1, wherein the fuel chamber (10B) of the pressure regulator is connected to the filtration chamber (A) in the motor chamber (8) via a regulator fuel introduction passage (16). 2. The filter F disposed in the motor chamber is formed in a cylindrical shape so as to surround the outer periphery of the motor M, and the filtration chamber A formed in the motor chamber 8 is formed in a cylindrical shape. The fuel supply apparatus as described. 4. The fuel supply apparatus according to claim 3, wherein the motor is an outer rotor type brushless motor. 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. The fuel supply device is attached to a lid member 30 that closes an opening TA formed below the fuel tank T, and is accommodated in the fuel tank T.
2. The fuel supply apparatus according to claim 1, wherein the pump suction path is connected to the inside of the fuel tank T via a strainer 31, and the discharge path 9 is opened toward the outside of the fuel tank T.

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