JP5520171B2 - Fuel pump mounting device for saddle riding type vehicles - Google Patents

Description

The present invention relates to a fuel pump mounting structure in a saddle-ride type vehicle such as a motorcycle, and in particular, when mounting a fuel pump on the bottom of a fuel tank, the mounting is possible even in a relatively small installation space. It is related to what improved the freedom degree of arrangement | positioning of a fuel pump.

As a fuel pump mounting structure in a conventional motorcycle, an opening is made in the bottom of the fuel tank, the opening edge is slightly bulged downward, a fixing ring is fixed to the outer periphery of the edge, A ring-shaped packing is applied to the part, a ring-shaped contact plate is applied to the bottom of the packing, and an open end of the cup-shaped member that is opened upward separately from the fuel tank and the fuel pump is provided below the contact plate. A structure in which a flange that protrudes downward is attached to the bottom plate of the fuel tank by attaching the flange formed on the bottom to the fixing ring with bolts and nuts, and the lower part of the fuel pump is accommodated and fixed in this cup is disclosed. Has been.

Japanese Patent No. 4205742

According to the above conventional example, a fuel pump can be attached by providing a cup on the bottom plate of the fuel tank, and the fuel is drawn from the inside of the cup having a relatively small capacity that protrudes downward from the bottom plate of the fuel tank. The remaining amount can be reduced.
However, in this structure, in order to provide the welded portion of the fixing ring, the bottom surface of the tank must have a relatively large area comparable to that of the cup flange. There was a restriction in arrangement that the pump mounting portion can be provided only in a space that can be accommodated.
For example, if separate parts such as engine cylinders and cushion support members are arranged around the tank and there is not enough space to accommodate the tank bottom having a relatively large area as described above, the fuel pump is installed with the mounting structure. It was difficult to install.
Accordingly, an object of the present invention is to make it possible to attach a pump to the bottom of a fuel tank so as to increase the degree of freedom in arrangement even when it is difficult to ensure a sufficiently large space as described above. To do.

In order to solve the above problems, the invention of claim 1 relating to a fuel pump mounting structure for a saddle-ride type vehicle includes a fuel tank mounted on a vehicle body frame,
A base member provided around an opening provided in the bottom plate of the fuel tank;
In a fuel pump mounting structure for a saddle-ride type vehicle comprising: a fuel pump inserted into the opening and attached to the base member;
The base member has a cylindrical part on the upper side, and a base side flange having a larger diameter than the cylindrical part on the lower side,
The fuel pump has a cup portion on the lower side and a pump side flange,
The upper part of the cylindrical part of the base member is welded to the opening of the fuel tank,
The pump side flange is attached to the base side flange.
Furthermore, the groove | channel along a circumferential direction is provided in the cylindrical part upper side surface of the said base member,
By this groove, a tank mounting edge projecting radially outward is formed at the uppermost portion of the cylindrical portion of the base member,
The periphery of the opening of the fuel tank and the tank mounting edge are welded, and the weld bead is welded so as to cross from the bottom plate of the fuel tank to the lower edge of the tank mounting edge. .

According to a second aspect of the present invention, in the first aspect of the present invention, the bottom plate of the fuel tank is provided with a bulging portion that bulges downward.

According to a fourth aspect of the present invention, in the first aspect, the saddle riding type vehicle includes a rearward tilting cylinder that is inclined rearward, and an engine fastened to the body frame.
A swing arm having a rear wheel at the rear and pivotally supported by the body frame,
A cushion unit provided between the swing arm and the body frame,
The cushion unit is connected to a cushion support member provided at the rear upper part of the vehicle body frame,
The fuel pump is disposed so as to be sandwiched between the rearward tilt cylinder and the cushion support member.

According to a third aspect of the present invention, in the second aspect of the present invention, a buffer plate is provided on each of the upper surfaces of the front and rear portions of the bottom portion of the bulging portion in the fuel tank to prevent the fuel from moving back and forth. .

The invention of claim 5,
A fuel tank attached to the body frame;
A base member provided around an opening provided in the bottom plate of the fuel tank;
In a fuel pump mounting structure for a saddle-ride type vehicle comprising: a fuel pump inserted into the opening and attached to the base member;
The base member has a cylindrical part on the upper side, and a base side flange having a larger diameter than the cylindrical part on the lower side,
The fuel pump has a cup portion on the lower side and a pump side flange,
The upper part of the cylindrical part of the base member is welded to the opening of the fuel tank,
The pump side flange is attached to the base side flange,
The saddle riding type vehicle has a rearwardly inclined cylinder inclined rearward, and an engine fastened to the vehicle body frame;
A swing arm having a rear wheel at the rear and pivotally supported by the body frame,
A cushion unit provided between the swing arm and the body frame,
The cushion unit is connected to a cushion support member provided at the rear upper part of the vehicle body frame,
The fuel pump is disposed so as to be sandwiched between the backward tilting cylinder and the cushion support member,
A plurality of nut holes are provided in the base side flange of the base member,
While having a bolt insertion hole coinciding with this nut hole, a holding plate for pressing the pump side flange from below is provided,
An escape portion for avoiding the cushion support member is provided at the rear portion of the pressing plate.

According to the first aspect of the present invention, the base member includes a cylindrical portion and a base side flange having an outer diameter larger than that of the cylindrical portion, and the fuel tank bottom plate is formed by the cylindrical portion having a relatively small outer diameter. When welding, the base member can be attached to the bottom of the fuel tank with a relatively small area, and a large-diameter base side flange is positioned below, so this is the pump side provided on the fuel pump as the fuel pump attachment part The flanges can be combined and fixed with bolts.
For this reason, even if it is difficult to secure a sufficient space for arranging the bottom of the fuel tank having a relatively large area where the flange of the cup member can be directly attached, the fuel pump is attached to the bottom of the fuel tank. Since it becomes possible to attach, the freedom degree of arrangement | positioning can be raised. In addition, since the fuel in the fuel tank enters the cylindrical portion that protrudes downward from the bottom plate of the fuel tank, even if the fuel is reduced in the fuel tank above the cylindrical portion, the fuel pump is fueled from within the cylindrical portion. Therefore, the remaining amount of death can be reduced.
Furthermore, by providing a groove in the upper part of the cylindrical portion, the welding tool can be moved closer to the base member to work. Further, since the tank attachment edge is left above the groove and the weld bead is passed from the bottom plate of the fuel tank to the lower edge of the tank attachment edge, the welding strength can be increased.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the fuel tank bottom plate is bulged downward to form the bulged portion, and the cylindrical portion is attached to the bottom portion, so that the tank capacity is secured. It can be made easier and the remaining amount of death can be reduced.

According to the third aspect of the present invention, since the buffer plates are provided at the front and rear bottom portions of the bulging portion , it is possible to suppress the fuel from moving back and forth by the buffer plates, so that the fuel dead amount can be reduced. can do.

According to the invention described in claim 4, it is possible to attach the cylindrical portion which is a member for attaching the fuel pump even in a narrow region sandwiched between the rearward tilting cylinder and the cushion support member.

According to the invention described in claim 5,
When the base member is provided with a cylindrical portion and a base-side flange having a larger outer diameter than the cylindrical portion, and is welded to the fuel tank bottom plate with the cylindrical portion having a relatively small outer diameter, the fuel tank having a relatively small area is obtained. A base member can be attached to the bottom, and a large-diameter base-side flange is positioned below, so that the pump-side flange provided on the fuel pump can be used as an attachment for the fuel pump and fixed with bolts.
For this reason, even if it is difficult to secure a sufficient space for arranging the bottom of the fuel tank having a relatively large area where the flange of the cup member can be directly attached, the fuel pump is attached to the bottom of the fuel tank. Since it becomes possible to attach, the freedom degree of arrangement | positioning can be raised. In addition, since the fuel in the fuel tank enters the cylindrical portion that protrudes downward from the bottom plate of the fuel tank, even if the fuel is reduced in the fuel tank above the cylindrical portion, the fuel pump is fueled from within the cylindrical portion. Therefore, the remaining amount of death can be reduced.
Furthermore, it is possible to attach a cylindrical portion which is a member for attaching the fuel pump even in a narrow region sandwiched between the rearward tilt cylinder and the cushion support member.
Moreover, even when the pump side flange of the fuel pump is clamped between the base plate and the flange with the presser plate, the presser plate is provided with an escape portion, so that a clearance with the cushion support member can be secured and the fuel tank can be installed. In addition, it is possible to easily prevent interference between the pressing plate and the cushion support member.

External side view of a motorcycle according to an embodiment Left side view of relevant parts of the vehicle The right side view which shows the opposite side of the site | part similar to FIG. Fig. 2 is an enlarged side view around the fuel tank. The perspective view which cuts off and shows a part of fuel tank about the site | part similar to FIG. Bottom view of fuel tank with fuel pump unit installed Sectional view along line 7-7 in FIG. A perspective view showing the fuel pump unit obliquely from below Top view of fuel tank Fuel tank side view Figure showing a rupture around the bulge Fig. 12 arrow 12 Fig. 13 arrow 13 Top view of base member Sectional view taken along line 15-15 in FIG. Top view of holding plate

An embodiment will be described below with reference to the drawings. FIG. 1 is a left side view of an external appearance of a motorcycle that is an example of a saddle-ride type vehicle to which the present invention is applied, with a vehicle body cover attached, and FIG. 2 is a vehicle body in which some of the external parts such as the vehicle body cover are omitted. 3 is a left side view of the main part, and FIG. 3 is a right side view of the main part of the vehicle body, in which a part of the exterior parts such as the vehicle body cover are shown in phantom lines.
In these drawings, reference numeral 1 denotes a front wheel which is rotatably supported by a head pipe 3 via a front fork 2 and is steered by a handle 4.

The head pipe 3 is provided at the front end of the vehicle body frame 5. A fuel tank 7 is supported on a main frame 6 extending in a pair of left and right sides obliquely downward to the rear, and an engine 8 is supported below.

The engine 8 includes a crankcase 9 and a cylinder 10 tilted rearward thereon. The crankcase 9 has an oil pan 9a that protrudes downward most greatly at the front lower portion, and a mission portion 9b is formed behind the oil pan 9a. The ground clearance at the lower surface of the mission unit 9b is higher than that of the oil pan 9a.
The transmission 9b is stepped higher than the oil pan 9a of the crankcase 9, and a relatively large diameter and large capacity muffler 20 is located below the transmission 9b.

The cylinder 10 tilts rearward and is positioned below the fuel tank 7, and the upper end portion (head cover) of the cylinder 10 approaches the bottom surface of the fuel tank 7.
An intake box 11 is located in front of the cylinder 10. The intake box 11 is sandwiched between a radiator 12 positioned in front of the intake box 11 and the cylinder 10, and the upper end of the intake box 11 is fixed to the bottom surface of the fuel tank 7.

An intake duct 13 is provided in the upper portion of the intake box 11, and a wind guide port 14 at the tip of the intake box 11 projects forward from the upper side of the radiator 12, and travel air is taken into the intake box 11 from the front side of the radiator 12.

The radiator 12 is arranged transversely in the vehicle width direction (left-right direction), the middle part in the left-right direction forms a curved surface that protrudes most backward, the upper part is supported by the main frame 6, and the lower part projects from the front surface of the crankcase 9. Supported by the stay 9c.

A known throttle body (not shown) is accommodated in the intake box 11 and is connected to an intake port 17 formed on the front surface of the cylinder 10 so as to face upward, and intake air from the front through the throttle body. ing.
Fuel is supplied to the throttle body from a fuel pump, which will be described later, and is electronically injected into the intake port 17.

An exhaust port 18 directed rearward is provided on the back side of the cylinder 10, and is discharged from here through an exhaust pipe 19. The exhaust pipe 19 once extends rearward, and then bends approximately 180 ° immediately afterward and extends across the left side of the crankcase 9 in a diagonally downward direction. After exiting the front of the crankcase 9, the exhaust pipe 19 is bent downward to the front. Of the crankcase 9 that extends downward along the rear side, bends further rearward, and winds the tip end of the oil pan 9a that projects to the lowermost side in a side view, forming a step behind the oil pan 9a. It goes down and connects to the muffler 20 arranged below the mission unit 9b.

Exhaust gas that has entered the muffler 20 is discharged to the outside air from a tail pipe 21 connected to the rear of the muffler 20. The tail pipe 21 bends approximately 90 ° to the right side of the vehicle body, further bends upward and rises, and the exhaust port 21a at the exhaust downstream end opens toward the rear of the vehicle body on the side of the rear arm 28 and the rear wheel 31.

Below the mission unit 9b is one step higher than the oil pan 9a, and below that, a space for arranging the muffler 20 between the oil pan 9a and the rear rear wheel 31 is secured. Therefore, the muffler 20 having a relatively large diameter and a large capacity can be disposed in this space. As a result, the center of gravity can be lowered by arranging the muffler 20 at the lowest position of the engine 8 with a minimum ground clearance equivalent to that of the oil pan 9a below the muffler 20. Since the muffler 20 can be arranged close to the center of gravity of 8, the mass can be concentrated.

The exhaust pipe 19 extends rearward from the exhaust port 18 and bends forward immediately thereafter, a second bent portion 19b that bends forward in front of the crankcase 9, and from the front of the crankcase 9 downward. A third bent portion 19c that bends is provided. The third bent portion 19 c is bent so as to go around the tip of the oil pan 9 a of the crankcase 9. As described above, the exhaust pipe 19 is formed so as to wind around the cylinder 10 in a substantially S-shape when viewed from the side, so that the mass is concentrated concentrically and is necessary and sufficient for improving the output in combination with the backward tilt of the cylinder 10. Realizes a long exhaust pipe length. The rearward inclination of the cylinder 10 is arbitrarily determined according to the required exhaust pipe length, but the exhaust pipe length can be shortened as the cylinder 10 is tilted backward compared to the upright position.

The exhaust port 18 is located in the vicinity of the center of the vehicle body, and gradually protrudes outward (leftward) from the first bent portion 19a to the second bent portion 19b rearward and forward, and from the second bent portion 19b to the vehicle body center. The third bent portion 19c is located on the center of the vehicle body, and then connected to the muffler 20 located along the center of the vehicle body and on the center of the vehicle body.

The exhaust pipe 19 has a first bent portion 19a curved in a space formed between the back surface of the cylinder 10 and the upper surface of the transmission portion 9b of the crankcase 9, and the side surface of the engine 8 is connected to the connecting portion between the cylinder 10 and the crankcase 9. The second bent portion 19b enters the space formed between the lower end of the radiator 12 and the lower front portion of the oil pan 9a, and enters the lower portion of the crankcase 9 at the third bent portion 19c. It is arranged using a gap formed between the parts.

The first bent portion 19a is substantially U-shaped in a plan view and a side view and bends into a three-dimensional shape. A portion 19e that wraps around the side surface of the cylinder 10 toward the second bent portion 19b is the cylinder 10 The bent portion 19e is also a part of the first bent portion 19a.

A center frame 22 extending in the vertical direction is connected to the rear end portion of the main frame 6, and a stay 23 that protrudes obliquely upward from the upper end portion thereof is provided. From the upper end of the stay 23, there is provided a seat rail 24 that rises obliquely and extends rearward, and supports the rear end portion of the fuel tank 7 and the seat 25 (FIG. 1). Reference numeral 26 denotes a rear stay that connects the lower portion of the stay 23 and the seat rail 24. The center frame 22, the stay 23, the seat rail 24, and the rear stay 26 are provided in a pair of left and right.

The center frame 22 extends obliquely up and down along the rear part of the transmission part 9b which is the rear part of the crankcase 9, and the front end part of the rear arm 28 is supported by the pivot part 27 at the middle part in the vertical direction. The front portion of the rear arm 28 is connected to the stay 23 by a cushion unit 30 via a link 29 provided at the lower portion. The stay 23 supports the seat rail 24 and is also a support member for the cushion unit 30.
A rear wheel 31 is supported at the rear end of the rear arm 28 and is chain driven by the engine 8.

The car body is covered with a car body cover. As shown in FIGS. 1 and 3, the vehicle body cover includes an upper cover 33 that covers the radiator 12, the intake box 11 and the cylinder 10 from the front of the head pipe 3, and a lower side surface of the engine 8 that is below the radiator 12. A lower cover 34 for covering is provided. The upper cover 33 and the lower cover 34 are divided into upper and lower portions on a side surface of the vehicle body, with a dividing line obliquely descending forward.

The lower cover 34 covers exhaust system components below the vicinity of the second bent portion 19b of the exhaust pipe 19. The rear end portion of the lower cover 34 is provided with an extending portion 35 extending so as to overlap the side surface of the rear wheel 31, and the tail pipe 21 covered with the extending portion 35 on the front side is bent in a substantially crank shape. The rear end portion (upper end portion) extends upward from the extending portion 35 and bends backward at a position overlapping the side surfaces of the rear wheel 31 and the rear arm 28, from which exhaust is discharged rearward.

A step 37 is located above the extending portion 35. The step 37 is provided at the rear end of the step holder 38 that protrudes rearward from the center frame 22 in a substantially V shape. The exhaust port 21a is located below and behind the step 37, and the exhaust port 21a opens rearwardly outward and obliquely upward.

Hereinafter, the attachment structure of the fuel pump unit 40 to the fuel tank 7 will be described in detail. FIG. 4 is an enlarged side view around the fuel tank, and FIG. 5 is a perspective view of the same portion with a part of the fuel tank cut away.
The fuel tank 7 integrally includes a front portion 7 a that covers the intake box 11 and the cylinder 10, and a large-capacity rear portion 7 b that is located behind the cylinder 10.
The bottom of the rear portion 7b forms a bulging portion 7c that protrudes downward, and the fuel pump unit 40 is built therein.

The bulging portion 7c is formed narrow in the vehicle width direction by a step 7d formed on the side surface of the rear portion 7b, and the front end portion of the seat rail 24 is disposed in a space below the step 7d and on the side of the bulging portion 7c. Has been. The fuel tank 7 has a bottom plate 7e continuous from the front portion 7a to the rear portion 7b, and the bulging portion 7c is formed by bulging the rear portion 7b of the bottom plate 7e downward.

A cup portion 41, which is a lower portion of the fuel pump unit 40, is detachably attached to the bottom portion of the bulging portion 7 c via a base member 50. The lower part of the cup part 41 of the fuel pump unit 40 is exposed by projecting further downward from the base member 50 projecting downward from the bulging part 7c.

The exposed portion of the cup portion 41 and the base member 50 are disposed in a V-shaped space S with the base portion of the stay 23 as the lowest portion in the vicinity of the connection between the rear end portion 6 a of the main frame 6 and the upper portion of the center frame 22. The front part is close to the back surface of the upper end part (head cover) of the cylinder 10, and the rear part is close to the cushion unit support part 23 a of the stay 23. A portion of the fuel pump unit 40 above the exposed portion of the cup portion 41 passes through the inside of the base member 50 and protrudes from the bulging portion 7c into the rear portion 7b of the fuel tank 7 and is built in a forward inclined state.

A discharge portion joint 42 connected to the discharge port of the fuel pump unit 40 is provided in the exposed portion of the cup portion 41, and a fuel supply hose 43 having a rear end connected to the discharge portion joint 42 extends forward, and the main frame 6 It is connected to a throttle body arranged on the front side of the cylinder 10 through the inside.

The cushion unit support portion 23a is a through hole formed in the left and right stays 23. The upper end portion of the cushion unit 30 is inserted between the left and right stays 23, and a bolt is passed from one cushion unit support portion 23a to the other side with a nut. By fastening, the upper end portion of the cushion unit 30 is supported by the stay 23.

The front end portions of the left and right seat rails 24 are attached to the upper end portion of the stay 23 above the cushion unit support portion 23a by bolting brackets 24a provided respectively.

As apparent from FIG. 4, the perpendicular V passing through the front end of the seat rail 24 intersects the rear end portion of the base side flange (described later) which is the maximum diameter portion of the base member 50. In other words, a part of the base member 50 can be arranged close to the front end of the seat rail 24 so as to overlap in the vertical direction, and can be arranged with high density, which contributes to the compactness of the entire vehicle body.
According to the invention described in claim 4, it is possible to attach the cylindrical portion which is a member for attaching the fuel pump unit 40 even in a narrow region sandwiched between the backward tilting cylinder and the cushion support member.

6 is a bottom view of the fuel tank 7 with the fuel pump unit 40 attached, FIG. 7 is a sectional view taken along line 7-7 of FIG. 4, and FIG. FIG. 6 is a perspective view showing the part cut away obliquely from below, and shows a part of the bulging part 7 c and showing the inside of the fuel tank 7.
The fuel tank 7 has a wide front portion 7a, and a rear portion 7b gradually changes in width toward the rear.

The fuel pump unit 40 is provided with a cup portion 41 having a predetermined depth with its upper portion opened at the lower portion, and an upper end portion of the cup portion 41 is folded outward to form a pump-side flange 45. A pump body 46 is provided above the pump side flange 45 so as to protrude upward. The pump main body 46 integrates the fuel pump unit 40 and various members necessary for sucking and sending the fuel to the discharge port. A fuel suction filter 47 is disposed near the bottom 41 a in the cup portion 41, and the fuel pump unit 40 sucks fuel through the fuel suction filter 47.

The cup portion 41 communicates with the bulging portion 7c via the base member 50, and the fuel in the bulging portion 7c flows into the cup portion 41. Therefore, the bottom portion 41a corresponds to the lowest portion of the fuel tank 7, and the fuel pump unit. Since the fuel can be sucked from the lowest portion 40, the remaining amount of death can be reduced.
Reference numeral 44 denotes a power source and signal line coupler.

As shown in FIG. 7, the base member 50 is attached to the bottom of the bulging portion 7c by a tank attachment edge portion 51 provided at the upper end portion, and the pump side flange 45 is attached to the base side flange 55 provided at the lower end portion. It has been. In this attachment, the upper surface of the pump side flange 45 is overlapped with the lower surface of the base side flange 55, and the pressing plate 70 is further overlapped with the lower surface of the pump side flange 45 and fastened with bolts 71. Reference numeral 72 denotes a wire clamp, which is fastened together with a base-side flange 55 by a bolt 71.
The maximum lateral width W2 of the base side flange 55 is larger than the lateral width W1 in the vehicle width direction at the bottom 60 of the bulging portion 7c (W2> W1).

9 to 13 show a single fuel tank, FIG. 6 is a plan view of the fuel tank, FIG. 10 is a side view, FIG. 11 is a view showing the bulging portion 7c around, FIG. 12 and FIG. It is a 12 and 13 arrow figure.

As shown in FIGS. 9 and 10, a front mounting bracket 62 is provided on the front portion 7 a so as to protrude forward, and is bolted to the front portion of the main frame 6. A rear mounting bracket 63 is provided at the rear end portion of the bulging portion 7c so as to protrude rearward, and is inserted below the mounting pipe 24b provided in the seat rail 24. The rear end portion of the rear portion 7b and the rear mounting bracket By fitting the attachment pipe 24b into the gap formed between the three. It can be attached to the seat rail 24 side by insertion.

As shown in FIG. 10, the bulging part 7c protrudes downward from the rear part 7b and forms the lowest part of the rear part 7b. The front side wall surface 60a of the bulging portion 7c is inclined obliquely downward and rearward toward the bottom portion 60 of the bulging portion 7c, and the rear side wall surface 60b is inclined obliquely downward and forward toward the bottom portion 60. A base member 50 is attached to the bottom 60 of the bulging portion 7c.

As shown in FIG. 11, a bottom opening 61 for inserting the fuel pump unit 40 into the rear portion 7b from below is formed in the bottom portion 60 of the bulging portion 7c. The bottom portion 60 of the bulging portion 7c is also a part of the bottom plate 7e.
On the tank mounting edge 51 of the base member 50, a ring-shaped rib 52 projects upward at a height of the thickness of the bottom 60 inside the outer periphery. The outer diameter of the ring-shaped rib 52 matches the hole diameter of the bottom opening 61, and when the ring-shaped rib 52 is fitted into the bottom opening 61, the outer peripheral surface of the ring-shaped rib 52 surrounds the bottom opening 61 of the bottom 60. The portion of the tank mounting edge 51 that protrudes outward in the radial direction is in close contact with the lower surface of the bottom portion 60. Therefore, when the periphery of the outer periphery of the tank mounting edge 51 is welded to the bottom 60, the tank mounting edge 51 can be liquid-tightly attached to the bottom 60.

In this way, the bulging portion 7c is reinforced by the base member 50 by bringing the bottom 60 into close contact with the tank mounting edge 51 and fitting the ring-shaped rib 52 into the bottom opening 61 to closely contact the end surface of the opening edge. it can. For this reason, in addition to the base member 50, a reinforcing member such as another ring-shaped member can be eliminated. Further, since it can be liquid-tightly attached, there is no need to interpose a seal member.

Further, a lower portion of the tank mounting edge portion 51 is a circumferential groove 53, and the outer wall of the cylindrical portion 54 is drawn inward in the radial direction. For this reason, since it becomes difficult for a tool to contact the outer wall of the cylinder part 54 at the time of welding operation, workability | operativity improves.
Further, since the bead 73 at the time of welding can be continuously formed from the lower surface of the bottom portion 60 into the circumferential groove 53 to the lower surface of the outer peripheral portion of the tank mounting edge portion 51, the welding strength can be increased.

Buffer plates 64 and 65 are provided before and after sandwiching the bottom opening 61. As shown in FIG. 12, the front buffer plate 64 has a substantially U-shape opened rearward and is perpendicular to the inclined surface of the front side wall surface 60 a and welded to the lower portion.

As shown in FIG. 13, the rear buffer plate 65 has a substantially U-shape opened to the front and is vertically arranged, and a lower end portion is welded to the rear side wall surface 60 b.
Since these buffer plates 64 and 65 can suppress the fuel in the bulging portion 7c from moving back and forth, the remaining amount of fuel can be reduced.

14 is a plan view of the base member 50, and FIG. 15 is a sectional view taken along line 15-15 of FIG.
In these drawings, the base member 50 is formed in a cylindrical shape and is formed by casting or forging an appropriate metal material. A circumferential groove 53 is formed on the outer periphery of the cylindrical portion 54. A tank mounting edge portion 51 is formed at the upper end portion so as to extend outward so as to cover the circumferential groove 53.

The tank mounting edge 51 is circular in plan view, and its radius is R1. The base-side flange 55 is also formed with notches 57a and 57b on the front and rear sides, but is substantially circular in plan view, and the radius of the portion other than the notch is R2. The base side flange 55 has a larger diameter than the tank mounting edge portion 51, R2 <R1, and there is a difference D = R2-R1 (see FIG. 15).
The outer diameter of the tank mounting edge 51 and the outer diameter of the portion below the circumferential groove 53 of the cylindrical portion 54 are substantially equal.

A plurality of nut holes 56 are provided on the outer peripheral portion of the base-side flange 55 at unequal intervals in the circumferential direction on a concentric circle. The position of the nut hole 56 is a position where, in plan view, the inner half of one hole is hidden under the tank mounting edge 51 and the outer half protrudes outward from the tank mounting edge 51, that is, A concentric circle passing through the center of each nut hole 56 and the outer periphery of the tank mounting edge 51 overlap.
A concave portion 45a into which the outer periphery of the pump side flange 45 is closely fitted is formed on the inner peripheral side of the nut hole 56 of the base side flange 55 (see FIG. 15).

The front cutout portion 57a is cut out linearly in the vehicle width direction and serves as a relief portion for the cylinder 10. The rear cutout 57 b serves as a relief for the cushion unit 30.
In this way, by providing the notches 57a and 57b that form the relief portions in the front and rear, the front and rear are made large in a narrow space S (see FIG. 4) sandwiched between the stays 23 that support the cylinder 10 and the cushion unit 30. The base member 50 having the base side flange 55 can be disposed.

At the upper end of the base member 50, the inner peripheral side of the ring-shaped rib 52 protrudes inward in the radial direction beyond the cylindrical portion 54, forms an inwardly protruding portion 58, and the inner peripheral end thereof is an upper opening 59. Is enclosed. The upper opening 59 is concentric with the bottom opening 61, but the hole diameter of the upper opening 59 is smaller than the hole diameter of the bottom opening 61 formed in the bottom portion 60 of the bulging portion 7c.

The size of the upper opening 59 is large enough to pass through the pump main body 46 of the fuel pump unit 40, and the bottom opening 61 is larger than this. Accordingly, the inwardly projecting portion 58 projects radially inward from the bottom opening 61, so that the fuel in the bulging portion 7c can be used when the vehicle body is tilted with a small amount of remaining fuel or during sudden acceleration / deceleration. Even if the liquid level is inclined, it is difficult for the liquid level to flow into the upper fuel tank, so that it is possible to ensure fuel supply when the remaining amount of fuel is low.

Next, in order to attach the fuel pump unit 40 to the bottom of the fuel tank 7, the pump body of the fuel pump unit 40 is inserted into the inner space of the base member 50 in a state where the base member 50 is previously attached below the bulging portion 7 c. The portion 46 is inserted from below, the upper portion is inserted into the rear portion 7b of the fuel tank 7 through the upper opening 59, and the pump side flange 45 is fitted into the recess 55a of the base side flange 55. Subsequently, the holding plate 70 in which the cup portion 41 of the fuel pump unit 40 is placed in the central hole 70 d is pushed up from below and pressed against the lower surfaces of the pump side flange 45 and the base side flange 55.

Thereafter, with each bolt through hole 70c aligned with the corresponding nut hole 56, and simultaneously with the notches 57a and 70a and 57b and 70b aligned with each other, the bolt 71 is passed through the bolt through hole 70c from below. Fasten to the nut hole 56. As a result, when the pump side flange 45 is attached by pressing the pump side flange 45 with the base side flange 55 and the holding plate 70, the pump side flange 45 cannot be directly bolted. Effective when manufactured. The present embodiment corresponds to this case.

In addition, since it is not necessary to provide a bolt hole in the pump side flange 45, the pump side flange 45 can be made small. Further, by holding the base side flange 55 between the base side flange 55 and the pressing plate 70, it is possible to increase the attachment rigidity of the base side flange 55 to the fixed portion.

However, the mounting with the holding plate 70 is not essential, and the pump side flange 45 may be directly attached to the base side flange 55 and the holding plate 70 may be omitted if conditions such as the use of a relatively large metal pump side flange are available. it can.

The base member 50 includes a cylinder portion 54 and a base-side flange 55 having an outer diameter larger than that of the cylinder portion 54, and a tank mounting edge 51 provided at the upper end portion of the cylinder portion 54 having a relatively small outer diameter. When welding to the bottom 60 of the bulging portion 7c, which is the bottom plate of the fuel tank, the base member 50 can be attached to the bottom 60 having a relatively small area where the pump side flange 45 cannot be attached.

In addition, since the base-side flange 55 having a large diameter is positioned below, the pump-side flange 45 provided on the cup portion 41 of the fuel pump unit 40 as an attachment portion of the fuel pump unit 40 can be combined with the base-side flange 55 and fixed with the bolts 71. .

Therefore, as a space S (FIGS. 4 and 5) sandwiched between the front and rear by the cylinder 10 and the stay 23, a comparatively wide area is provided so that the flange of the cup member configured separately from the fuel pump unit 40 can be directly attached. Even when it is difficult to secure a sufficiently large space for disposing the bottom of the fuel tank, the fuel pump unit 40 can be attached to the bulging portion 7 c provided at the bottom of the fuel tank 7. Therefore, the freedom degree of arrangement | positioning can be raised.

Further, since the fuel in the fuel tank 7 enters the inside of the cylindrical base member 50 protruding downward from the bottom portion 60 of the bulging portion 7c, which is the bottom plate of the fuel tank, the fuel tank rear portion 7b above the base member 50. Even when the amount of fuel decreases, the fuel pump unit 40 can suck the fuel from the base member 50 and the cup portion 41, so that the remaining amount of death can be reduced.

In addition, since the bottom plate 7e of the fuel tank 7 is bulged downward to form a bulged portion 7c, and the cylindrical base member 50 is attached to the bottom portion 60, it is easy to ensure the tank capacity and reduce the remaining amount of death. can do.

Further, when the pump side flange 45 is sandwiched between the presser plate 70 and the base side flange 55, the presser plate 70 is provided with a relief portion including the cutout portions 70a and 70b. 23 can be secured, and when the fuel tank 7 is attached, interference between the presser plate 70 and the stay 23 can be easily prevented.

The invention of the present application can be applied not only to a motorcycle but also to a saddle-ride type vehicle such as a four-wheel buggy.

6: main frame, 7: fuel tank, 7c: bulging part, 8: engine, 10: cylinder, 23: stay, 24: seat rail, 30: cushion unit, 40: fuel pump unit, 41: cup part, 45 : Pump side flange, 50: base member, 51: tank mounting edge, 53: groove, 54: cylindrical portion, 55: base side flange, 56: nut hole, 57a / 57b: notch, 70: holding plate , 70a, 70b: Notch, 71: Bolt, 73: Beat

The fuel pump mounting structure according to the present invention is suitable for a fuel tank of a saddle-ride type vehicle such as a motorcycle or a wheel buggy.

Claims (5)

A fuel tank (7) attached to the body frame (5);
A base member (50) provided around an opening (61) provided in a bottom plate (7e) of the fuel tank (7);
In a fuel pump mounting structure for a saddle-ride type vehicle, the fuel pump (40) being inserted into the opening (61) and attached to the base member (50).
The base member (50) has a cylindrical part (54) on the upper side and a base side flange (55) having a larger diameter than the cylindrical part (54) on the lower side,
The fuel pump (40) has a cup part (41) and a pump side flange (45) on the lower side,
The upper part of the cylindrical part (54) of the base member (50) is welded to the opening (61) of the fuel tank,
The pump side flange (45) is attached to the base side flange (55) ;
A groove (53) extending in the circumferential direction is provided on the upper side surface of the cylindrical portion (54) of the base member (50),
The groove (53) forms a tank mounting edge (51) projecting radially outward at the uppermost portion of the cylindrical portion of the base member (50),
The periphery of the opening (61) of the fuel tank and the tank mounting edge 51 (51) are welded, and the weld bead (73) is welded from the fuel tank bottom plate (7e) to the tank mounting edge ( 51) A fuel pump mounting structure for a saddle-ride type vehicle, which is welded so as to cross over a lower edge . The fuel pump mounting structure for a saddle-ride type vehicle according to claim 1, wherein a bulging portion (7c) bulging downward is provided on a bottom plate (7e) of the fuel tank. Buffer plates (64, 65) are provided on the upper surfaces of the front and rear parts (60a, 60b) of the bottom part (60) of the bulging part (7c) in the fuel tank (7) to suppress the fuel from moving back and forth. the fuel pump mounting structure for a saddle type vehicle according to claim 2, characterized in that was. The saddle riding type vehicle has a rearward tilting cylinder (10) inclined rearward and an engine (8) fastened to the body frame (5);
A swing arm (28) having a rear wheel (31) at the rear and pivotally supported by the body frame;
A cushion unit (30) provided between the swing arm (28) and the vehicle body frame (5);
The cushion unit (30) is connected to a cushion support member (23) provided at the rear upper part of the vehicle body frame (5),
The fuel pump mounting structure for a saddle-ride type vehicle according to claim 1, wherein the fuel pump (40) is disposed so as to be sandwiched between the rearward tilting cylinder (10) and the cushion support member (30). . A fuel tank (7) attached to the body frame (5);
A base member (50) provided around an opening (61) provided in a bottom plate (7e) of the fuel tank (7);
In a fuel pump mounting structure for a saddle-ride type vehicle, the fuel pump (40) being inserted into the opening (61) and attached to the base member (50).
The base member (50) has a cylindrical part (54) on the upper side and a base side flange (55) having a larger diameter than the cylindrical part (54) on the lower side,
The fuel pump (40) has a cup part (41) and a pump side flange (45) on the lower side,
The upper part of the cylindrical part (54) of the base member (50) is welded to the opening (61) of the fuel tank,
The pump side flange (45) is attached to the base side flange (55);
The saddle riding type vehicle has a rearward tilting cylinder (10) inclined rearward and an engine (8) fastened to the body frame (5);
A swing arm (28) having a rear wheel (31) at the rear and pivotally supported by the body frame;
A cushion unit (30) provided between the swing arm (28) and the vehicle body frame (5);
The cushion unit (30) is connected to a cushion support member (23) provided at the rear upper part of the vehicle body frame (5),
The fuel pump (40) is disposed so as to be sandwiched between the backward tilting cylinder (10) and the cushion support member (30),
The base side flange (55) of the base member (50) is provided with a plurality of nut holes (56),
While having a bolt insertion hole (70a) coinciding with this nut hole (56), a pressing plate (70) for pressing the pump side flange (45) from below is provided,
The fuel pump mounting structure for a saddle type vehicle you characterized in that escape portion is provided to avoid the cushion support member (23) in a rear portion of the pressing plate (70).

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