Delivery pipe for engine

Abstract

To provide a delivery pipe for an engine which can support a pipe body in a posture directing an opening upward when welding a plug and prevent useless extension of the whole length.SOLUTION: A delivery pipe for an engine includes: a synthetic resin pipe body 2 in which each of bracket sections 8l, 8r, as an outer peripheral projection section on an outer peripheral surface, which is formed with a flange-like large diameter section 5 on one end side and has an opening 6 having one end of a fuel passage 4 inside along an axis line which is formed in the large diameter section 5, and a plurality of injector connection sections 10l, 10r are integrally formed; and a plug 3 which is joined to the large diameter section 5 and closes the opening 6. In the injector connection section 10r closest to one end side, a first support surface 17 supported by a first fixing jig 21r is formed. A second support surface 19 supported by a second fixing jig 21l is formed on an opposite side with the axis line as a center with respect to the first support surface 17 and on the other end side of the large diameter section 5. The first and second support surfaces 17, 19 are formed into a planar shape facing the other end side.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a delivery pipe of an engine.

Background Art

[0002] For example, Patent Document 1 discloses a delivery pipe in which a main body portion having a cylindrical shape with one end open and a plug are each made of a synthetic resin material, and the plug is liquid-tightly welded to the open end portion of the main body portion. A delivery passage for supplying fuel is formed in the main body portion along the axis, and a large-diameter portion having a flange shape is formed at one end portion of the main body portion, and the delivery passage is opened to the outside through the open end portion formed in this large-diameter portion. The open end portion is formed for mold release when the main body portion is injection-molded, but since it is necessary to block the open end portion in order to function as fuel distribution, the plug is welded to the large-diameter portion as described above.

[0003] When welding the plug, with the main body portion having the open end portion opened upward, the fixing jigs of the ultrasonic welding device are arranged from the left and right on the lower surface of the large-diameter portion, and the large-diameter portion is supported from below by these fixing jigs. Then, the plug is arranged on the large-diameter portion, and ultrasonic vibration is applied while pressing the plug from above by the horn of the ultrasonic welding device for welding.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] On the main body of the delivery pipe, for example, an injector connection part connected to an injector, or a bracket part for attaching the delivery pipe to the engine is integrally formed. When these injector connection parts or bracket parts are close to the large-diameter part, a fixing jig for supporting the large-diameter part from below cannot be arranged during the welding operation. Therefore, it is necessary to separate the large-diameter part upward from the injector connection part or the bracket part to secure a space where the fixing jig can be arranged. As a result, the overall length of the delivery pipe is unnecessarily extended by the amount of the separated arrangement, and there is a problem that the arrangement of the delivery pipe and the injector is restricted and the mountability to the engine deteriorates.

[0006] The present invention has been made to solve such problems, and the object thereof is to support the pipe body in a welding posture with the opening facing upward during the welding operation of the plug, and to prevent an unnecessary extension of the overall length and improve the mountability to the engine. An object of the present invention is to provide a delivery pipe for an engine.

Means for Solving the Problems

[0007] To achieve the above object, the delivery pipe for an engine of the present invention has a large-diameter part formed in a flange shape on one end side, and one end of a fuel passage formed inside along the axis has an opening formed in the large-diameter part. A bracket part for attachment to the engine as an outer peripheral protrusion on the outer peripheral surface, and a plurality of injector connection parts arranged side by side in the axial direction to which injectors are respectively connected are integrally formed. In a delivery pipe for an engine including a pipe body made of synthetic resin and a plug joined to the large-diameter part of the pipe body to close the opening, a first support surface for being supported by a first fixing jig is formed on the outermost peripheral protrusion located on the most one end side, and with respect to the first support surface, on the opposite side centered on the axis and on the other end side of the large-diameter part, a second support surface for being supported by a second fixing jig is formed, and the first support surface and the second support surface are formed in a planar shape facing the other end side.

[0008] As another aspect, the first support surface and the second support surface may be formed on opposite sides of 180° about the axis of the pipe body.

[0009] As another aspect, the outer peripheral protrusion located at the most one end side is an injector connection portion, the first support surface and the second support surface are surfaces perpendicular to the axis, and the first support surface may be formed on the outer peripheral surface of the cylindrical shape of the injector connection portion.

[0010] As another aspect, the outer peripheral protrusion located at the most one end side is a bracket portion, the first support surface and the second support surface are surfaces perpendicular to the axis, and the first support surface may be formed on the bracket portion.

[0011] As another aspect, a reinforcing rib connecting a plurality of injector connection portions may be integrally formed on the outer peripheral surface of the pipe body, and the first support surface may have a region cut out corresponding to the reinforcing rib.

[0012] As another aspect, the injector connection portion may be formed with an engaging portion that keeps the coupler connected to the connector of the injector in a posture directed obliquely toward the pipe body side and one end side.

[0013] As another aspect, the second support surface is formed by a step between the outer peripheral surface of the pipe body and the outer peripheral surface of the large-diameter portion to form a surface perpendicular to the axis facing the other end side, and may have an arc-shaped region surrounding the outer peripheral surface of the pipe body.

Advantages of the Invention

[0014] According to the delivery pipe of the engine of the present invention, during the welding operation of the plug, the pipe body can be supported in a welding posture with the opening facing upward, and unnecessary extension of the entire length can be prevented, thereby improving the mountability to the engine.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0016] Hereinafter, an embodiment of the delivery pipe of the engine embodying the present invention will be described. FIG. 1 is a perspective view showing the delivery pipe of the present embodiment, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a front view thereof, and FIG. 4 is a right side view thereof.

[0017] The delivery pipe 1 of the present embodiment is applied to a two-cylinder engine mounted on a four-wheel buggy which is a kind of so-called ATV (All Terrain Vehicle). In each figure, the engine is located below the delivery pipe 1. In the following description, the vertical direction in FIG. 3 is referred to as up and down, the horizontal direction in FIG. 3 is referred to as left and right, and the direction orthogonal to the plane of FIG. 3 is referred to as front and back to represent each direction. In the present embodiment, the right side corresponds to one end side of the present invention, and the left side corresponds to the other end side of the present invention.

[0018] As shown in FIGS. 1 to 3, the delivery pipe 1 is composed of a pipe body 2 made of synthetic resin and a plug 3, and these members 2 and 3 are manufactured by injection molding using, for example, a synthetic resin material. The pipe body 2 has a cylindrical shape extending in the left - right direction along the axis Cdp, and its interior serves as a fuel passage 4. The left end of the fuel passage 4 is closed, and the right end of the fuel passage 4 is integrally formed with a large - diameter portion 5 having a circular flange shape. The right end of the fuel passage 4 is open to the outside through an opening 6 formed on the right end face of the large - diameter portion 5.

[0019] A nipple portion 7 projects rearward at the left - right center of the pipe body 2. In the state where the delivery pipe 1 is assembled to the engine, a fuel hose extending from the vehicle body side is connected to the nipple portion 7. On both the left and right sides of the nipple portion 7 on the pipe body 2, bracket portions 8l and 8r for attachment to the engine are integrally formed. Each of the bracket portions 8l and 8r projects downward and rearward from the outer peripheral surface 2a of the pipe body 2, and a metal bush 9 is fitted therein by insert molding. In the state of being assembled to the engine, each of the bracket portions 8l and 8r is fastened to the engine by bolts from above through the bush 9, whereby the delivery pipe 1 is fixed at the intended position.

[0020] Corresponding to each cylinder of the engine, two injector connection portions 10l and 10r are arranged in parallel along the axial direction on the pipe body 2. One injector connection portion 10l is located at the left end of the pipe body 2, and the other injector connection portion 10r is located near the right end of the pipe body 2, that is, near the large - diameter portion 5. The left - right bracket portions 8l and 8r and the left - right injector connection portions 10l and 10r correspond to the "outer peripheral protruding portions" of the present invention, and the right - hand injector connection portion 10r corresponds to the "outer peripheral protruding portion located on the most one - end side" of the present invention. The relationship between this right - hand injector connection portion 10r and the large - diameter portion 5 relates to the gist of the present invention, and its details will be described later.

[0021] Each injector connection part 10l, 10r protrudes downward, and its outer peripheral surface is cylindrical. A fitting hole 10r-2 (shown only on the right side in FIG. 5) is formed at the lower end. In the state of being assembled to the engine, the upper ends of the injectors 11l, 11r are fitted into the fitting holes 10r-2 of each injector connection part 10l, 10r in a state of being liquid-tightly held by the O-ring 12. Further, the lower ends of the injectors 11l, 11r are fitted into the fitting holes of the intake manifold 13 of the engine shown by the two-dot chain line in FIG. 3 in a state of being liquid-tightly held.

[0022] As shown in FIGS. 1, 3, and 4, connectors 11l-1, 11r-1 are provided on the side surfaces of the injectors 11l, 11r, respectively. The left connector 11l-1 faces in the upper and left diagonal directions, and the right connector 11r-1 faces in the upper and right diagonal directions. In the state of being assembled to the engine, couplers 14l, 14r of the harness extended from the vehicle body side are connected to these connectors 11l-1, 11r-1, respectively, and the injectors 11l, 11r are driven by the drive signals supplied from the controller for engine control.

[0023] An engaging convex portion 10l-1 protrudes leftward on the outer peripheral surface of the left injector connection part 10l. By fitting this engaging convex portion 10l-1 into the engaging concave portion 14l-1 protruding from the left coupler 14l, the rotation around the axis Clij of the left injector 11l is restricted. Similarly, an engaging convex portion 10r-1 protrudes rightward on the outer peripheral surface of the right injector connection part 10r. By fitting this engaging convex portion 10r-1 into the engaging concave portion 14r-1 protruding from the right coupler 14r, the rotation around the axis Crij of the right injector 11r is restricted. The engaging convex portion 10r-1 of the right injector connection part 10r corresponds to the "engaging portion" of the present invention.

[0024] FIG. 5 is an enlarged cross-sectional view corresponding to part A of FIG. 3, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5. As shown in FIGS. 3, 5, and 6, reinforcing ribs 16 that connect the respective injector connection portions 10l and 10r and the respective bracket portions 8l and 8r are integrally formed on the lower side of the outer peripheral surface 2a of the pipe body 2, thereby enhancing the rigidity of the delivery pipe 1. A first support surface 17 having a planar shape facing leftward is formed on the outer peripheral surface of the right injector connection portion 10r. In other words, the first support surface 17 forms a plane perpendicular to the axis Cdp of the pipe body 2. As shown by hatching in FIG. 6, the first support surface 17 has a square-shaped region cut out corresponding to the reinforcing rib 16 and extends to the outer peripheral surface 2a of the pipe body 2. Since the right injector connection portion 10r and the right bracket portion 8r are spaced apart in the left-right direction, a first space 18 indicated by a two-dot chain line where the fixing jigs 21l and 21r of the infrared welding device described later can be disposed is necessarily formed on the left side of the first support surface 17. That is, in the delivery pipe of the present embodiment, the first space 18 is formed between the injector connection portion 10r and the bracket portion 8r.

[0025] The above-described large-diameter portion 5 is integrally formed with a portion on the right side of the right injector connection portion 10r. Specifically, as shown in FIG. 3, the large-diameter portion 5 is located at the right end side of the right injector connection portion 10r, and its lower left portion is integrally formed with the upper right portion of the injector connection portion 10r. A step is formed between the outer peripheral surface 5a of the large-diameter portion 5 and the outer peripheral surface 2a of the smaller-diameter pipe body 2, and a second support surface 19 is formed by this step. As shown by hatching in FIG. 6, the second support surface 19 has an arc-shaped region of about 180° surrounding the outer peripheral surface 2a of the pipe body 2 centered on the axis Cdp, and has a planar shape facing leftward as shown in FIG. 5. In other words, the second support surface 19 forms a plane perpendicular to the axis Cdp of the pipe body 2. Since no large protrusion is formed on the upper side of the outer peripheral surface 2a of the pipe body 2 other than the large-diameter portion 5, a second space 20 indicated by a two-dot chain line where the fixing jigs 21l and 21r can be disposed is necessarily formed on the left side of the second support surface 19.

[0026] Although the injector connection part 10r and the large-diameter part 5 are partially integrally formed, the large-diameter part 5 is located on the right side with respect to the injector connection part 10r. For this reason, in the axial direction Cdp of the pipe body 2, the second support surface 19 is located on the right side of the first support surface 17.

[0027] On the other hand, as described above, the opening 6 is formed on the right side surface of the large-diameter part 5, and the plug 3 is joined to the large-diameter part 5 by infrared welding, thereby closing the opening 6. Specifically, as shown in FIG. 5, on the right side surface of the large-diameter part 5, inner and outer double grooves 5b and 5c are formed so as to surround the opening 6, and a welding region 5d having an annular shape is formed between the grooves 5b and 5c. Similarly, on the left side surface of the plug 3, inner and outer double grooves 3a and 3b are formed, and a welding region 3c having an annular shape is formed between the grooves 3a and 3b. These welding regions 5d and 3c are butted against each other and joined to each other by infrared welding, and the opening 6 is closed by the plug 3. Although not shown, the welding regions 5d and 3c of the large-diameter part 5 and the plug 3 before welding slightly protrude in a direction approaching each other compared to the inner and outer peripheral regions thereof, and during the welding operation, this protruding portion melts and welds together as the welding allowance. Note that the cross-sectional shape of the welding regions 5d and 3c is not limited to the above and can be arbitrarily changed.

[0028] The delivery pipe 1 configured as described above is assembled to the engine, and during the operation of the engine, fuel is supplied from the fuel hose to the delivery pipe 1 through the nipple part 7. The fuel is distributed to each injector connection part 10l and 10r through the fuel passage 4, and is injected into the intake manifold 13 of the engine according to the opening and closing of the injectors 11l and 11r, mixed with the intake air, and supplied as an air-fuel mixture into each cylinder of the engine for combustion.

[0029] Next, in the above delivery pipe 1, the working procedure for welding the plug 3 to the large-diameter part 5 of the pipe body 2 will be described. FIG. 7 is a front view showing the pipe body 2 supported by a fixing jig during the welding operation of the plug 3, FIG. 8 is a front view showing the pipe body 2 when the plug 3 is pressurized by a movable jig, and FIG. 9 is a plan view showing the pipe body 2 supported by the fixing jig.

[0030] As shown in these figures, the welding operation of the plug 3 is carried out by holding the pipe body 2 in a welding posture with the opening 6 facing upward and arranging the fixing jigs 21l and 21r from the left and right. Therefore, in the following description, the vertical direction along the axis of the pipe body 2 in the welding posture in FIG. 7 is referred to as up and down, and the left-right direction in which the jigs are arranged is referred to as left and right. The fixing jig 21r on the right side of the present embodiment corresponds to the "first fixing jig" of the present invention, and the fixing jig 21l on the left side corresponds to the "second fixing jig" of the present invention.

[0031] First, as shown in FIGS. 7 and 9, after the pipe body 2 is set in the welding posture, the fixing jigs 21l and 21r of the infrared welding device are arranged from the left and right. Since the first space 18 is formed below the first support surface 17, the fixing jig 21r on the right side is arranged in the first space 18 without any problem and supports the first support surface 17 of the injector connection portion 10r from below. In the plan view of FIG. 9, since the first support surface 17 is cut out corresponding to the reinforcing rib 16, the fixing jig 21r also has a shape cut out corresponding to the reinforcing rib 16.

[0032] In addition, since the second space 20 is formed below the second support surface 19, the fixing jig 21l on the left side is arranged in the second space 20 without any problem and supports the second support surface 19 of the large-diameter portion 5 from below. In the plan view of FIG. 9, since the second support surface 19 has an arc shape surrounding the outer peripheral surface 2a of the pipe body 2, the fixing jig 21l also has a shape curved in an arc corresponding to the outer peripheral surface 2a of the pipe body 2.

[0033] In this way, by supporting the first and second support surfaces 17 and 19 from below with the fixing jigs 21l and 21r, the pipe body 2 is maintained in the intended welding posture with the opening 6 facing upward. As shown in FIG. 7, above the large-diameter portion 5, a movable jig 22 that moves up and down by a servomotor (not shown) is positioned, and the plug 3 is fixed to this movable jig 22. In this state, the large-diameter portion 5 and the plug 3 are vertically separated from each other. Between them, as shown by the two-dot chain line, an infrared lamp 23 is inserted, and then the infrared rays are irradiated onto the respective welding regions 5d and 3c to melt them. Next, the infrared lamp 23 is retracted to the position shown by the solid line, and as shown in FIG. 8, the plug 3 is lowered together with the movable jig 22 by the servomotor and is pressed and crimped onto the large-diameter portion 5. The welding regions 5d and 3c are welded, and the plug 3 is joined to the large-diameter portion 5 to close the opening 6.

[0034] Next, the operation and effect of the delivery pipe 1 of the present embodiment will be described. A major feature of the delivery pipe 1 of the present embodiment is that, instead of the large-diameter portion 5, the existing injector connection portion 10r formed on the pipe body 2 is supported from below by the right fixing jig 21r. For example, as in Patent Document 1, in FIG. 7, when the large-diameter portion 5 is supported by the left fixing jig 21l in the same way as the first support surface 17 of the large-diameter portion 5 is supported, and when the large-diameter portion 5 is also supported by the right fixing jig 21r, it is necessary to secure a space for disposing the fixing jig 21r below the large-diameter portion 5. As a result, the large-diameter portion 5 is spaced apart upward from the right injector connection portion 10r, and as shown by the two-dot chain line in FIG. 3, the overall length of the delivery pipe 1 is uselessly extended by the dimension L.

[0035] By using the existing injector connection part 10r for support by the fixing jig 21r on the right side, it becomes unnecessary to space the large-diameter part 5 apart from the injector connection part 10r. Therefore, as shown by the solid line in FIG. 3, the large-diameter part 5 can be integrally formed at the right-side part of the injector connection part 10r, whereby the overall length of the delivery pipe 1 can be shortened by the dimension L compared to that of Patent Document 1. And the shortening of the overall length of the delivery pipe 1 leads to an improvement in the mountability of the delivery pipe 1 in the engine room of the limited four-wheel buggy, such as expanding the degree of freedom in arranging the delivery pipe 1 in the engine room.

[0036] Also, since it becomes unnecessary to space the large-diameter part 5 apart, the degree of freedom regarding the arrangement of the injectors 11l, 11r is also improved. For example, as shown by the two-dot chain line in FIG. 3, when the large-diameter part 5 is spaced apart from the injector connection part 10r, the large-diameter part 5 interferes with the coupler 14r connected to the connector 11r-1 of the injector 11r on the right side. For this reason, for example, as shown by the two-dot chain line in FIG. 4, a measure is taken to change the posture of the connector 11r-1 centered on the axis Crij of the injector 11r by 90°. However, if the coupler 14r protrudes forward from the delivery pipe 1, the possibility of interference with the peripheral components in the engine room increases, thus deteriorating the mountability of the delivery pipe 1.

[0037] In this embodiment, since it is not necessary to space apart the large-diameter portion 5, the connector 11r-1 and the coupler 14r can be arranged on the right side of the right injector connection portion 10r. Specifically, an engaging convex portion 10r-1 is projectingly provided rightward on the outer peripheral surface of the right injector connection portion 10r. By this engaging convex portion 10r-1, as shown in FIGS. 3 and 4, the connector 11r-1 and the coupler 14r can be kept in a posture facing upward and rightward, in other words, facing the pipe body 2 side and the right side. Therefore, the protrusion of the coupler 14r in the front-rear direction can be prevented. As a result, although the overall shape of the delivery pipe 1 including the injectors 11l and 11r, the connectors 11l-1 and 11r-1, and the couplers 14l and 14r requires a certain amount of occupied space in the left-right direction and the up-down direction, since there is no protruding portion in the front-rear direction, almost no occupied space is required. Therefore, the mountability of the delivery pipe 1 in the engine room can be further improved.

[0038] Also, the second support surface 19 of the large-diameter portion 5 is flat, and the first support surface 17 is also formed to be flat on the cylindrical outer peripheral surface of the injector connection portion 10r. In addition, the first support surface 17 and the second support surface 19 are formed on the 180° opposite sides centered on the axis Cdp of the pipe body 2. Due to these factors combined, each of the fixing jigs 21l and 21r can receive the pressing force from the movable jig 22 evenly and stably support the pipe body 2, which also contributes to good welding of the plug 3 and thus quality improvement.

[0039] On the other hand, as shown by hatching in FIG. 9, the first support surface 17 is cut out corresponding to the reinforcing rib 16, and the fixing jig 21r also has a shape cut out corresponding to the reinforcing rib 16. Therefore, the first support surface 17 and the fixing jig 21r are in contact with each other with a large area in plan view, and in the left-right direction, they are in contact up to a region close to the axis Cdp of the pipe body 2, in other words, a region close to the pressing force received from the movable jig 22. Due to these requirements combined, the first support surface 17 can be supported more stably.

[0040] Further, the second support surface 19 has an arc shape surrounding the outer peripheral surface 2a of the pipe body 2, and the fixing jig 21l also has a shape that conforms to an arc corresponding to the outer peripheral surface 2a of the pipe body 2. Therefore, the second support surface 19 and the fixing jig 21l are in contact with each other over a large area in a plan view, and in the left-right direction, they are in contact up to a region close to the axis Cdp of the pipe body 2, in other words, up to a region close to the pressing force received from the movable jig 22. These requirements combined can support the second support surface 19 more stably. The above points also contribute to good welding of the plug 3 and thus to quality improvement.

[0041] Aspects of the present invention are not limited to this embodiment. For example, in the above embodiment, it is embodied in the delivery pipe 1 applied to a two-cylinder engine mounted on a four-wheel buggy, but it is not limited to this. For example, as the vehicle on which the engine is mounted, it may be applied to a passenger car, or a motorcycle or a bicycle with an electric motor, etc., and the type of the engine can also be arbitrarily changed.

[0042] Also, in the above embodiment, the side where the plug 3 is welded to the end of the fuel passage 4 is described as one end side (right side), and the side where the plug 3 is not welded to the end of the fuel passage 4 is described as the other end side (left side). However, it is sufficient that at least one end is welded with the plug 3. For example, it is also applicable in the case where both ends are welded with the plug 3.

[0043] Also, in the above-described embodiment, although the first support surface 17 is formed on the right injector connection portion 10r as the outer peripheral protruding portion, the present invention is not limited to this. The arrangements of the injector connection portions 10l and 10r and the bracket portions 8l and 8r on the pipe body 2 vary depending on, for example, requirements from the engine side or various conditions such as the space within the engine room. For this reason, in FIG. 3, for example, the positions of the right injector connection portion 10r and the bracket portion 8r may be interchanged, and the bracket portion 8r may be formed at a position close to the large-diameter portion 5. In this case, since the right bracket portion 8r corresponds to the "outer peripheral protruding portion located at the most one-end side" of the present invention, the bracket portion 8r is integrally formed with the large-diameter portion 5 and the first support surface 17 is formed, and a first space 18 in which the fixing jig 21r can be disposed may be formed between the first support surface 17 and the injector connection portion 10r.

Explanation of Reference Numerals

[0044] 1 Delivery pipe 2 Pipe body 3 Plug 4 Fuel passage 5 Large-diameter portion 6 Opening 8l Bracket portion (outer peripheral protruding portion) 8r Bracket portion (outer peripheral protruding portion located at the most one-end side) 10l Injector connection portion (outer peripheral protruding portion) 10r Injector connection portion (outer peripheral protruding portion located at the most one-end side) 10r-1 Engagement convex portion (engagement portion) 11l,11r Injector 11r-1 Connector 14r Coupler 16 Reinforcing rib 17 First support surface 19 Second support surface 21r Fixing jig (first fixing jig) 21l Fixing jig (second fixing jig)

Claims

1. A synthetic resin pipe body integrally formed with a large-diameter portion having a flange shape formed at one end, one end of a fuel passage formed inside along the axis having an opening formed in the large-diameter portion, a bracket portion for attachment to an engine as an outer peripheral protrusion on the outer peripheral surface, and a plurality of injector connection portions arranged side by side in the axial direction to which injectors are respectively connected; A plug joined to the large-diameter portion of the pipe body for closing the opening; In a delivery pipe of an engine comprising: The outermost peripheral protrusion located at the most one end side has a first support surface for being supported by a first fixing jig; With respect to the first support surface, on the opposite side centered on the axis, a second support surface for being supported by a second fixing jig is formed on the other end side of the large-diameter portion; The first support surface and the second support surface are formed in a planar shape facing the other end side. A delivery pipe of an engine, characterized in that.

2. The first support surface and the second support surface are formed on opposite sides 180° centered on the axis. The delivery pipe of an engine according to claim 1, characterized in that.

3. The outermost peripheral protrusion located at the most one end side is the injector connection portion; The first support surface and the second support surface are surfaces perpendicular to the axis; The first support surface is formed on the cylindrical outer peripheral surface of the injector connection portion. The delivery pipe of an engine according to claim 1 or 2, characterized in that.

4. The outermost peripheral protrusion located at the most one end side is the bracket portion; The first support surface and the second support surface are surfaces perpendicular to the axis; The first support surface is formed on the bracket portion. The delivery pipe of an engine according to claim 1 or 2, characterized in that.

5. Reinforcing ribs for connecting the plurality of injector connection portions are integrally formed on the outer peripheral surface of the pipe body; The first support surface has a region cut out corresponding to the reinforcing rib. The delivery pipe of an engine according to claim 3, characterized in that.

6. The injector connection portion is formed with an engaging portion for maintaining a posture in which a coupler connected to the connector of the injector is directed obliquely in the pipe body side and one end side direction. The delivery pipe of an engine according to claim 3, characterized in that.

7. The second support surface is formed by a step between the outer peripheral surface of the pipe body and the outer peripheral surface of the large-diameter portion, forms a plane perpendicular to the axis facing the other end side, and has an arc-shaped region surrounding the outer peripheral surface of the pipe body. The delivery pipe of the engine according to claim 1 or 2, characterized by the above.

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