JP2007211669A - Fuel pump unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel pump unit, to which large flow and small flow pressure regulators are selectively mounted without changing the shapes of a lid and a pump holder. <P>SOLUTION: In a lid A, an annular cylinder part 11 projected downward from the lower surface 10a of a flange part 10, and a fuel passage boss part 12 inside thereof are projected, a first insert hole connected to a first fuel outflow passage 14 is opened toward the lower end 12a, and a second insert hole opened in the horizontal direction is opened in the side surface 12b. The pump holder B includes a fuel pump P, the pump holder B is mounted on the lid A with an insert cylindrical part 17 locked on the annular cylindrical part 11, and a fuel discharge shaft part 20 connected to a pump discharge passage Pa is inserted and connected to the first insert hole. A joint member 1 includes a horizontal shaft part 1a and a vertical shaft part 1b, an inflow cylindrical part 41a of the large-flow rate pressure regulator Rb is inserted in the regulator insert hole 1d opened at the lower end 1b1 of the vertical shaft part 1b, and the horizontal shaft part 1a is inserted and connected to the second insert hole of the lid A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, fuel is boosted by a fuel pump disposed in a fuel tank, and the boosted fuel is controlled to a predetermined fuel pressure by a pressure regulator and is injected and supplied from a fuel injection valve toward an engine. With regard to the injection device, a fuel pump unit device is formed by mounting at least a fuel pump and a pressure regulator in a lid that closes the opening of the fuel tank, and a pump holder locked to the fuel tank, and the lid is a fuel. The present invention relates to a fuel pump unit apparatus in which an opening of a tank is closed and a fuel pump mounted on a pump holder and a pressure regulator are inserted and arranged in the fuel tank through the opening of the fuel tank.

A conventional fuel pump unit device is shown in FIG. FIG. 2 is a longitudinal sectional view of an essential part of a conventional fuel pump unit device. The fuel pump unit device U is formed of a lid A and a pump holder B that is locked to the lid A. The lid A has a flange 10 that closes the opening Ta of the fuel tank T, an annular cylinder 11 that protrudes downward from the lower surface 10a of the flange 10, and an inner side of the annular cylinder 11 that is at least a flange A fuel flow path boss portion 12 that protrudes downward from the lower surface 10a of the portion 10 is provided. The annular cylinder portion 11 is provided with a locking hole 13 penetrating laterally, and a first fuel outflow portion 14 is provided in the fuel flow passage boss portion 12 in the vertical direction in the drawing. A lower portion of the one fuel outflow passage 14 is opened with a first insertion hole 15 at a lower end 12a of the fuel passage boss portion 12, and an upper portion thereof opens toward the outside.
Further, a second insertion hole 15 is formed in the side surface 12 b of the fuel flow path boss portion 12 so as to be opened in the horizontal direction, and the second insertion hole 15 is a first fuel outflow path above the first insertion hole 15. 14 through a second fuel outlet 16. The pump holder B is formed thereon with an insertion cylinder part 17 to be inserted inward of the annular cylinder part 11, and is inserted into the locking hole 13 of the annular cylinder part 11 outside the insertion cylinder part 17. A locking projection 18 that locks the lid member A and the pump holder B in the vertical direction protrudes. Further, a pump storage cylinder portion 19 for storing and holding the fuel pump P is formed below the pump holder B, and a fuel discharge shaft portion 20 is formed on the upper portion of the pump storage cylinder portion 19 so as to protrude upward. Is done. The fuel discharge shaft portion 20 is formed with a fuel discharge passage 21 penetrating therethrough in the vertical direction. The upper portion of the fuel discharge passage 21 opens at the upper end 20a of the fuel discharge shaft portion 20, and the lower portion is inserted with a pump. A hole 22 opens at the lower end 20 b of the fuel discharge shaft portion 20. The pump insertion hole 22 opens toward the inside of the pump storage cylinder portion 19.

Then, the fuel pump P is inserted into the pump housing cylinder portion 19 from the lower end opening of the pump housing tube portion 19 of the pump holder B, and the lower end opening is fitted by the bottomed cup-shaped cap 23, thereby The fuel pump P is housed and disposed inside the cylinder portion 19. At this time, the pump discharge path Pa protruding above the fuel pump P is inserted into the pump insertion hole 22 through the O-ring 24 in an airtight manner. Be placed.
The pump suction path Pb of the fuel pump P opens downward, and a fuel filter F is attached to the pump suction path Pb.
On the other hand, the pressure regulator Ra shown in FIG. Such pressure regulator Ra is formed by: Reference numeral 30 denotes a first casing having a bottomed cup shape having a discharge hole 30b formed in the upper bottom part 30a and a flange part 30c below the upper hole 30a. Reference numeral 31 denotes an inflow hole 31b formed in the lower bottom part 31a. It is the 2nd housing | casing which makes bottomed cup shape which has the collar part 31c above it.
An outer peripheral edge of a diaphragm 32 is sandwiched and fixed between the flange portion 30c and the flange portion 31c, and a spring chamber 33 is formed on the first housing 30 side by the diaphragm 32, so that the second housing A fuel chamber 34 is sectioned on the 31 side. In addition, a valve seat 35 is fixedly disposed on the diaphragm 32, and a flow path 36 is formed through the valve seat 35 from the upper end toward the lower end. A valve seat 37 facing the inside of the fuel chamber 34 is formed below, and the upper side opens into the spring chamber 33. A valve body 38 having a spherical shape is disposed between a valve body locking projection 31d protruding above the lower bottom 31a of the second housing 31 and the valve seat 37. Is constantly held and pressed by the valve body locking projection 31d by a valve body pressing spring 39 that is contracted in the flow path 36 of the valve seat body 35. Further, the valve seat 37 of the valve seat body 35 is elastically pressed against the valve body 38 by a diaphragm spring 40 that is contracted in the spring chamber 33.
The pressure regulator Ra is attached to the lid A, and the second housing 31 of the pressure regulator Ra is inserted into the second insertion hole 15 in the horizontal direction from the side surface 12b of the fuel flow path boss portion 12. The fuel passage boss 12 is screwed by a plate (not shown). Note that L1 is an O-ring that is contracted between the second housing 31 and the second insertion hole 15, and the pressure regulator Ra is mounted in the second insertion hole 15 in an airtight manner. And the insertion cylinder part 17 of the pump holder B provided with the fuel pump P and the fuel filter F is inserted into the inside of the annular cylinder part 11 of the lid A, and the locking protrusion 18 is inserted into the locking hole 13. Then, the pump holder B is locked and attached to the lid body A. At this time, the upper portion of the fuel discharge shaft portion 20 is hermetically inserted into the first insertion hole 15 via the O-ring L2. .
Thus, the fuel pump unit device Ua including at least the fuel pump P, the fuel filter F, and the pressure regulator Ra is formed. The pump holder B of the fuel pump unit device Ua and the annular cylindrical portion 11 of the lid A are the fuel. The fuel tank T is inserted into the fuel tank T through the opening Ta of the tank T. In this state, the opening Ta of the fuel tank T is held closed by the flange 10.

  According to the above, the fuel in the fuel tank T is removed from the foreign matter by the fuel filter F, and is sucked into the fuel pump P from the pump suction passage Pb and boosted, and the boosted fuel is pumped into the pump discharge passage Pa and the fuel discharge. The fuel is supplied from the passage 21 into the first fuel outflow passage 14. On the other hand, a part of the fuel flowing in the first fuel outflow passage 14 is introduced into the fuel chamber 34 of the pressure regulator Ra via the second fuel outflow passage 16, and the fuel pressure applied to the fuel chamber 34 and the diaphragm spring The diaphragm 32 is moved up to a position where the spring force of 40 is balanced with the set pressure to open the valve seat 37, thereby adjusting the fuel pressure flowing in the first fuel outflow passage 14 to a predetermined fuel pressure, The pressure-adjusted fuel is supplied through a fuel pipe to a fuel injection valve (a fuel injection valve is not shown) disposed outside. When the valve seat 37 is opened, the return fuel flowing through the flow path 36 of the valve seat body 35 is returned into the fuel tank T through the spring chamber 33 and the discharge hole 30b. The valve body 38 is always held in contact with the valve body locking projection 31d by the valve body pressing spring 39.

Here, the flow rate of the return fuel of the pressure regulator Ra used in the above is limited to a small flow rate of about 20 L / H. This is because the valve seat 37 and the flow path 36 are formed inside the valve seat body 35 attached to the diaphragm 30. The overall height of the spring chamber 33 is kept low and the movement stroke of the diaphragm 32 is restricted by using the spherical valve body 38. Etc. The pressure regulator Ra is called a small flow pressure regulator Ra and is often used for a small displacement internal combustion engine. On the other hand, when the fuel pump unit device is used for an internal combustion engine with a large displacement, the flow rate of the return fuel is small and a desired control pressure, for example, 294 kpa, cannot be obtained. For example, a pressure regulator Rb shown in FIG. 4 that can flow a large flow rate of about 40 L / H is employed. This pressure regulator Rb is called a large flow pressure regulator Rb and will be described with reference to FIG. Reference numeral 40 denotes a first housing having a lower bottom portion 40a on the lower side and opened upward. Reference numeral 41 denotes a second housing having an inflow cylinder portion 41a formed upward and opening downward from the upper bottom portion 41b. The second housing 41 has an upper end from the upper end of the inflow tube portion 41a toward the lower bottom portion 41b. A valve seat 42 in which an inflow hole 41c is formed and a flow path 42a is formed in the upper bottom portion 41b is disposed so as to protrude. Further, a discharge passage 43 that opens outward is connected to the valve seat 42. A diaphragm 44 is disposed between the upper opening of the first casing 40 and the lower opening of the second casing 41, and the outer peripheral edge of the diaphragm 44 is between the flange 40 b of the first casing 40 and the second casing 41. It is clamped and fixed by the flange 41d.
According to the above, the spring chamber 45 is formed by the diaphragm 44 and the first housing 40, and the fuel chamber 46 is partitioned by the diaphragm 44 and the second housing 41. A flat plate-like valve body 47 is attached to the diaphragm through a support body 48 so as to face a valve seat 42b formed at the lower end of the valve seat 42, and the valve body 47 is contracted in the spring chamber 45. The diaphragm spring 48 is biased toward the valve seat 42a. Similarly to the pressure regulator Ra, the pressure regulator Rb opens the valve seat 42b at a predetermined opening at a position where the fuel pressure flowing into the fuel chamber 46 from the inflow hole 41c and the spring force of the diaphragm spring 48 are balanced. The fuel pressure can be adjusted to a predetermined pressure by discharging the fuel in the fuel chamber 46 through the flow path 42 a and the discharge hole 43 of the valve seat 42. The pressure regulator Rb can increase the flow rate of the return fuel (exhaust fuel) to a large flow rate without restricting the valve seat diameter of the valve seat 42b of the valve seat 42 by other members. What can be set. The movement of the diaphragm 44 is not limited by the use of the flat valve body 47. Etc.

Here, in the fuel pump unit apparatus Ua shown in FIG. 2, when the pressure regulator Rb for large flow rate is mounted instead of the pressure regulator Ra for small flow rate, the following problems are caused. That is, the inflow tube portion 41a of the large flow pressure regulator Rb is inserted into the second insertion hole 15 of the lid A, and the large flow pressure regulator Rb is attached to the lid A. The pressure regulator Rb for a large flow rate is arranged so as to protrude largely to the side as shown by a one-dot chain line in FIG. That is, the longitudinal axis XX passing through the centers of the fuel chamber 46 and the spring chamber 45 largely protrudes to the side.
According to the above, it becomes difficult to insert the fuel pump unit device Ua into the fuel tank T through the opening Ta of the fuel tank T, and the diameter of the opening Ta of the fuel tank T is increased, or the lid A It was necessary to change the shape of this product, which was accompanied by a major remodeling, resulting in a significant increase in manufacturing cost.

  The present invention has been made in view of the above problems, and by adopting a single component, the pressure regulator Rb for large flow rate can be directly mounted on the conventional fuel pump unit device, and the fuel pump unit is inexpensive in manufacturing cost. An object is to provide an apparatus.

In the fuel pump unit device according to the present invention, in order to achieve the above-mentioned object, the lid body protrudes downward from the flange portion closing the opening of the fuel tank and the lower surface of the flange portion, and is locked toward the side. An annular cylindrical portion in which a hole is drilled, a fuel flow channel boss portion that protrudes downward from at least the lower surface of the collar portion, and is formed in the fuel flow channel boss portion. A lower end of the fuel flow path boss part opens from the lower end of the fuel flow path boss portion with a first insertion hole, and a first flow path from the first fuel flow path above the first insertion hole branches to the side. A second fuel outflow passage that is open with a second insertion hole on a side surface of the portion;
The pump holder is inserted and arranged in the upper part of the annular cylinder part, and has an insertion cylinder part provided with a locking projection to be locked in the locking hole. A pump housing cylinder, a fuel discharge shaft projecting upward from the pump housing cylinder, and penetrating through the fuel discharge shaft, the lower end of which is directed toward the lower end of the fuel discharge shaft. A fuel discharge path that opens with a locking projection of the insertion tube portion locked in the locking hole of the annular tube portion, and a pump discharge path of a fuel pump that is housed in the pump storage tube portion is a pump. In a fuel pump unit device that is hermetically inserted and disposed in the insertion hole and the upper end of the fuel discharge shaft portion is hermetically inserted and disposed in the first insertion hole, the joint member includes a horizontal shaft portion extending in a horizontal direction, Vertical axis that extends substantially perpendicular to the horizontal axis And a regulator fuel flow path having one end opened at the outer end of the horizontal shaft portion and the other end opened by a regulator insertion hole at the lower end of the vertical shaft portion. (2) Airtightly inserted into the insertion hole, the pressure regulator is airtightly inserted into the joint member's regulator insertion hole, and the pressure regulator is placed in the upper projection surface of the annular tube portion of the lid. And

  According to the present invention, the inflow cylinder portion of the pressure regulator for a large flow rate is hermetically inserted into the regulator insertion hole opened at the lower end of the vertical shaft portion of the joint member and attached to the joint member. A horizontal shaft portion of a joint member having a pressure regulator for flow rate is hermetically inserted into a second insertion hole opened on a side surface of the fuel flow passage boss portion of the lid member, and the joint member is connected to the fuel flow passage boss of the lid member. It is attached to the department. According to the above, the pressure regulator for the large flow rate is arranged with the longitudinal axis of the fuel chamber and the spring chamber along the weight axis of the joint member, and the pressure regulator for the large flow rate is the upper part of the annular cylindrical portion of the lid Since it is arranged in the projection plane, the fuel pump unit device can be inserted into the fuel tank without changing the diameter of the opening of the conventional fuel tank. In addition, in the above, the conventional lid and pump holder constituting the fuel tank, the fuel pump unit device can be used as they are, and it is only necessary to prepare a joint member. It was a deterrent.

The fuel pump unit device Ub according to the present invention will be described below with reference to FIG. The lid A, the pump holder B, and the like constituting the fuel pump unit device Ub are used as they are, and the description of the used configuration is omitted using the names and symbols in FIG. The joint member 1 is formed by the following.
1a is a horizontal shaft portion extending in the horizontal direction, 1b is a vertical shaft portion extending downward from the left end in FIG. 1 of the horizontal shaft portion 1a, and the horizontal shaft portion 1a and the vertical shaft portion 1b are L-shaped. . A regulator fuel passage 1c is bored from the outer end 1a1 of the horizontal shaft portion 1a (the right end of the horizontal shaft portion 1a) toward the lower end 1b1 of the vertical shaft portion 1b. Of these, the regulator fuel passage 1c is connected to the lower end 1b1 of the regulator fuel passage 1c. A regulator insertion hole 1d is formed in the opening. That is, the regulator fuel channel 1c is opened to the lower end 1b1 of the vertical shaft portion 1b by the regulator insertion hole 1d. Such a joint member 1 is manufactured at low cost by injection molding using a synthetic resin material.

  And the fuel pump unit apparatus Ub provided with the pressure regulator Rb for large flow rates is formed by the following. First, the inflow tube portion 41a of the pressure regulator Rb for large flow rate is inserted and arranged in an airtight manner with the O-ring 2 in the regulator insertion hole 1d of the joint member 1. Secondly, the horizontal shaft portion 1a of the joint member 1 is inserted in an airtight manner with the O-ring 3 into the second insertion hole 15 opened in the side surface 12b of the fuel flow passage boss portion 12 of the lid member A. The member 1 is attached to the fuel flow path boss 12 by a plate or the like (not shown). According to the above, the pressure regulator Rb for large flow rate is attached to the lid A via the joint member 1. Thirdly, the pump holder B including the fuel filter F and the fuel pump P is locked and coupled to the lid A by the locking protrusion 18 being locked to the locking hole 13.

  Thus, the fuel pump unit device Rb including the fuel filter F, the fuel pump P, and the pressure regulator Rb for a large flow rate is formed. Even in the fuel pump unit device Rb, the fuel pressure increased by the fuel pump P is formed. A part of the fuel is supplied into the fuel chamber 46 of the pressure regulator Rb for large flow rate via the first fuel outflow passage 14, the second fuel outflow passage 16, and the regulated fuel passage 1 c of the joint member 1. The fuel pressure flowing in the outflow passage 14 can be regulated to a predetermined constant fuel pressure. Also, return fuel at a large flow rate (for example, 40 L / H) can be discharged from the valve seat 42b, the flow path 42a of the valve seat 42, and the discharge hole 43.

According to the fuel pump unit device Rb of the present invention, the inflow tube portion 41a of the pressure regulator Rb for large flow rate is inserted and disposed in the regulator insertion hole 1d formed in the vertical shaft portion 1b of the joint member 1, and the horizontal shaft portion. Since 1a is inserted and arranged in the second insertion hole 15 that opens in the horizontal direction, the longitudinal axis X-X passing through the fuel chamber 46 and the spring chamber 45 of the pressure regulator Rb for large flow rate is connected to the fuel pump unit device Ub. The pressure regulator Rb for large flow rate can be disposed in the upper projection surface Y of the annular cylindrical portion 11 of the lid A. According to this, the conventional fuel tank T The fuel pump unit device Ub can be inserted into the fuel tank T without increasing the diameter of the opening Ta. Also, when adopting the high flow pressure regulator Rb, the lid A and the pump holder B used when adopting the low flow pressure regulator Ra can be used as they are, and the joint member 1 is prepared slightly. Therefore, an increase in manufacturing cost can be suppressed extremely small.
Further, the fact that the opening Ta of the fuel tank T can be used as it is does not change the external shape of the fuel tank T, and according to this, the external appearance of the motorcycle in which the fuel tank T is exposed to the outside is not particularly impaired.
It should be noted that when the pressure regulator Ra for small flow rate is adopted, the joint member 1 may be removed and the first housing 30 of the pressure regulator Ra for small flow rate may be inserted and disposed in the second insertion hole 15. Nor.
Further, the joint member 1 inserted into the second insertion hole 15 of the fuel flow path boss portion 12 is allowed to escape to the left side of the horizontal shaft portion 1a, and the left inner side 17a of the insertion cylinder portion 17 of the pump holder B is used. Arranged to face the outside of the vertical shaft portion 1b. And the escape in the longitudinal axis direction XX of the pressure regulator Rb for large flow rate inserted into the regulator insertion hole 1d, the regulating projection Ba projecting upward from the pump holder B is used as the pressure regulator Rb for large flow rate. According to the arrangement facing the lower bottom portion 40a of the first casing 40, the joint member 1 having the large flow pressure regulator Rb can be attached to the lid A very easily and more reliably. In addition, according to the above, the joint member 1 can also be attached to the lid A without using a special attachment member such as a plate. Moreover, according to the said method, especially the detachment | desorption of the joint member 1 can be performed very easily, and assembly property and maintenance property can be improved.

The principal part longitudinal cross-sectional view which shows one Example of the fuel pump unit apparatus which becomes this invention. The principal part longitudinal cross-sectional view of the conventional fuel pump unit apparatus. The longitudinal cross-sectional view which shows the pressure regulator for small flow rates. The longitudinal cross-sectional view which shows the pressure regulator for large flow rates.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint member 1a Horizontal axis | shaft part 1b Vertical axis | shaft part 1c Regulator fuel flow path 1d Regulator insertion hole 10 collar part 11 Annular cylinder part 12 Fuel channel boss part 14 1st fuel outflow path 15 1st insertion hole 17 Insertion cylinder part 19 Pump Storage cylinder 20 Fuel discharge shaft 22 Pump insertion hole A Lid B Pump holder P Fuel pump Rb Pressure regulator for large flow rate

Claims (1)

The lid A has a flange portion 10 that closes the opening Ta of the fuel tank T, and an annular tube portion 11 that protrudes downward from the lower surface 10a of the flange portion 10 and that has a locking hole 13 formed in a lateral direction. And at least the fuel flow path boss part 12 that protrudes downward from the lower surface 10a of the flange part 10 at the inside of the annular cylinder part 11, and the lower end of the fuel flow path boss part 12. A first fuel outflow passage 14 opening at the lower end 12a of the flow passage boss portion 12 with a first insertion hole 15 and a side branching from the first fuel outflow passage 14 above the first insertion hole 15 to the side. A second fuel outflow passage 16 that opens with a second insertion hole 15 is provided on the side surface 12b of the road boss portion 12,
The pump holder B is inserted and arranged on the inner side of the annular cylindrical portion 11 at the upper side thereof, and the insertion cylindrical portion 17 having a locking projection 18 locked to the locking hole 13, and below that, A pump housing cylinder portion 19 that houses the fuel pump P, a fuel discharge shaft portion 20 that protrudes upward from the pump storage tube portion 19, and a fuel discharge shaft portion 20 that penetrates the lower end of the fuel discharge shaft portion 20. A fuel discharge passage 21 having a pump insertion hole 22 that opens toward the lower end 20b of the shaft portion 20, and the locking projection 18 of the insertion tube portion is locked in the locking hole 13 of the annular tube portion 11, The pump discharge path Pa of the fuel pump P housed in the pump housing cylinder 19 is inserted and disposed in an airtight manner in the pump insertion hole 22, and the upper end 20 a of the fuel discharge shaft part 20 is in the first insertion hole 15. Fuel pump unit device that is hermetically inserted and arranged The joint member 1 has a horizontal shaft portion 1a extending in the horizontal direction, a vertical shaft portion 1b extending substantially perpendicular to the horizontal shaft portion 1a, and one end opened to the outer end 1a1 of the horizontal shaft portion 1a. The other end is formed by a regulator fuel passage 1c having a regulator insertion hole 1d at the lower end 1b1 of the vertical shaft portion 1b, and the horizontal shaft portion 1a of the joint member is hermetically sealed in the second insertion hole 15 of the lid A. The pressure regulator Rb is hermetically inserted into the regulator insertion hole 1d of the joint member 1 and the pressure regulator Rb is arranged in the upper projection surface Y of the annular cylindrical portion 11 of the lid A. Fuel pump unit device.

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