WO2017110320A1

WO2017110320A1 - Vaporizer

Info

Publication number: WO2017110320A1
Application number: PCT/JP2016/084044
Authority: WO
Inventors: 鈴木　祥介; 知幸千田; 崇後藤
Original assignee: 本田技研工業株式会社
Priority date: 2015-12-25
Filing date: 2016-11-17
Publication date: 2017-06-29
Also published as: JP2017115734A

Abstract

This vaporizer (11) is provided with: a piston-shaped throttle valve (32) for opening and closing an intake path (27) formed in a vaporizer body (15), the throttle valve (32) being caused to open and close the intake path (27) by a throttle cable (14) being operated; and an arm mechanism having an arm part (67) connected to the throttle valve and a shaft part (22) rotatably supported by the vaporizer body. The throttle valve and the arm part are housed in a housing part (25) formed on the vaporizer body. A first lid member (18) covering the open end of the housing part is mounted on the vaporizer body. An opening (35) through which the throttle valve can be inserted is formed in the first lid member. A second lid member (21), which covers the opening and which has formed therein an insertion path (34) through which the throttle cable can be inserted, is detachably mounted on the first lid member. It is thereby possible to provide a vaporizer in which workability and working efficiency when attaching a throttle cable can be improved.

Description

Vaporizer

The present invention relates to a vaporizer.

As disclosed in Patent Document 1, the carburetor includes a piston-type throttle valve that changes the opening of the intake passage formed in the carburetor body by operating the throttle cable. The throttle valve is connected to a free end of an arm body that is rotatably supported around the axis of the carburetor body. The throttle valve and the arm body are accommodated in an accommodating portion formed in the carburetor body. The open end of the accommodating part is closed with a lid member. The lid member is fastened and fixed to the carburetor body by a plurality of screws, and a holding cylinder that receives the throttle cable is formed on the lid member.

Japanese Unexamined Patent Publication No. 11-229968

する When a carburetor is mounted on a vehicle such as a saddle-ride type vehicle, the carburetor is delivered to the finished vehicle manufacturer in a state disconnected from the throttle cable. The assembly of the throttle cable is carried out in the vehicle production process. In assembling the throttle cable, the operator loosens a plurality of screws such as two or three, removes the lid member from the carburetor body, and takes out the components of the throttle valve from the housing space of the carburetor body. The operator connects the throttle cable to the component part outside, and returns the component part with the throttle cable to the accommodating space of the carburetor body again. Subsequently, the operator assigns the lid member to the vaporizer body, and fastens the screw to fix the lid member to the vaporizer body. As described above, in assembling the throttle cable, it takes time to remove and fasten the plurality of screws, and there is a possibility that the screws may drop, so that sufficient workability and work efficiency have not been ensured. In addition, there was room for improvement in the case of maintenance such as replacement of the throttle cable because it was conceivable that the same problems would be faced.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a vaporizer that can improve workability and work efficiency.

According to the first aspect, by operating a throttle cable, a piston-like throttle valve that opens and closes an intake passage formed in a carburetor body, an arm portion connected to the throttle valve, and the carburetor A carburetor including an arm mechanism having a shaft portion rotatably supported by a main body, wherein the throttle valve and the arm portion are housed in a housing portion formed in the carburetor body, and the housing A first lid member that covers the open end of the portion is attached to the carburetor body, and an opening through which the throttle valve can be inserted is formed in the first lid member, and the throttle cable covers the opening. There is provided a carburetor in which a second lid member in which an insertion passage that can be inserted is formed is detachably attached to the first lid member.

According to the second aspect, in addition to the configuration of the first side surface, only the engaging portion formed integrally with the first lid member and the engaged portion formed integrally with the second lid member. Thus, the coupling state of the first lid member and the second lid member is maintained.

According to the third aspect, in addition to the configuration of the first side surface, the first lid member is detachably attached to the vaporizer body by a fastening member, and the second lid member includes the second lid member. A grip portion is formed that is gripped when the lid member is attached to and detached from the first lid member, and at least a part of the grip portion is provided at a position higher than the top of the fastening member.

According to the fourth aspect, in addition to the configuration of the first side surface, when the opening is viewed from the direction in which the throttle valve is inserted, the connecting portion between the arm mechanism and the throttle valve can be visually recognized. An opening is formed.

According to the fifth aspect, in addition to the configuration of the first side surface, at least a part of the shaft portion of the arm mechanism is provided with a protrusion portion that protrudes from the shaft portion, and the protrusion portion is disposed on the vaporizer. The shaft portion can be rotated by operating from the outside.

According to the sixth aspect, in addition to the configuration of the first side surface, the first lid member is formed with a boss surrounding the opening, and the second lid member is screwed into the boss and screwed. The insertion path is formed on the rotation axis of the second lid member rotated by the rotation.

According to the seventh aspect, in addition to the configuration of the first side surface, the arm mechanism includes a spring member that biases the throttle valve in a closing direction, and the arm portion is configured to resist the biasing of the spring member. The connection between the tip of the arm and the throttle valve can be released by turning, and when the throttle valve is removed from the housing, the tip of the arm is A restricting portion for restricting the amount of rotation of the arm mechanism is formed in the accommodating portion so as not to contact the vaporizer body.

According to the first aspect, in the parts supply manufacturer that delivers the carburetor to the finished vehicle manufacturer, when the throttle valve and the arm part are accommodated in the accommodating part, each part is vaporized from the open end of the wide frontage in the accommodating part. It can be incorporated into a vessel and good workability can be ensured. In addition, the manufacturer and user of the finished vehicle to which the carburetor is delivered can attach the throttle cable to the carburetor by attaching / detaching the second lid member to / from the first lid member. Thus, the second lid member can be attached and detached without going through the removal work and fastening work, and workability and work efficiency can be improved. Also, maintenance work such as replacement of the throttle cable can be performed efficiently as well.

According to the second aspect, the first lid member and the second lid are formed only by the engaging portion formed integrally with the first lid member and the engaged portion formed integrally with the second lid member. Since the coupling state with the lid member is maintained, the second lid member can be attached to and detached from the first lid member with a simple configuration without using a fastening member such as a screw.

According to the third aspect, when the second lid member is attached to or detached from the first lid member, at least a part of the grip portion is provided at a position higher than the top portion of the fastening member. Instead, the grip portion can be easily gripped. The attaching / detaching operation of the second lid member can be performed more easily.

According to the fourth aspect, after connecting the throttle cable to the throttle valve, when returning the throttle valve from the opening to the accommodating portion, the operator can visually check the connection state of the connection portion between the throttle valve and the arm mechanism. Workability is further improved.

According to the fifth aspect, since the projecting portion is provided on the shaft portion and the shaft portion can be turned by operating the projecting portion from the outside of the carburetor, the connecting operation between the arm mechanism and the throttle valve is performed. The arm mechanism can be rotated by operating the protrusion from the outside of the carburetor body, so that the arm portion and the throttle valve can be connected, and the workability is further improved.

According to the sixth aspect, since the throttle cable insertion passage is formed on the rotation axis of the second lid member, the twisting of the throttle cable, the throttle cable, Interference with the insertion path can be suppressed, and the second lid member can be attached and detached more easily.

According to the seventh aspect, since the restricting portion is formed in the accommodating portion, the amount of rotation of the arm mechanism is adjusted so that the tip of the arm portion is not in contact with the carburetor body when the throttle valve is removed from the accommodating portion. It is possible to regulate, and contact between the tip of the arm portion and the vaporizer body can be avoided.

FIG. 1 is a side view schematically showing the overall configuration of a vaporizer according to an embodiment of the present invention (first embodiment). FIG. 2 is a plan view of the vaporizer observed from above (first embodiment). FIG. 3 is a vertical sectional view of the vaporizer body (first embodiment). FIG. 4 is a vertical sectional view of the carburetor body partially showing a main air bleed passage facing the main jet (first embodiment). FIG. 5 is a vertical sectional view of the carburetor body partially showing a slow air bleed passage facing the slow jet (first embodiment). FIG. 6 is an enlarged partial vertical sectional view schematically showing the configuration of the air bleed passage (first embodiment). FIG. 7 is an enlarged partial vertical sectional view schematically showing the relationship between the main air bleed passage and the slow air bleed passage and the valve body (first embodiment). FIG. 8 is an enlarged partial vertical sectional view schematically showing a part of the arm mechanism (first embodiment). FIG. 9 corresponds to FIG. 2 and is a plan view of the vaporizer with the first lid member removed (first embodiment). FIG. 10 corresponds to FIG. 2 and is a plan view of the vaporizer with the second lid member removed (first embodiment). FIG. 11 is an enlarged partial vertical cross-sectional view schematically showing a part of an arm mechanism as an alternative (first embodiment).

DESCRIPTION OF SYMBOLS 11 ... Vaporizer 14 ... Throttle cable 15 ... Vaporizer main body 18 ... 1st cover member 19 ... Fastening member (bolt)
21 ... 2nd lid member 21a ... Grasping part 22 ... Shaft part (operation shaft)
23 ... Spring support piece 24 ... Spring member 25 ... Accommodating part 26 ... Valve cylinder 27 ... Intake passage 32 ... Throttle valve 34 ... Insertion passage 35 ... Opening 36 ... Boss 67 ... Arm part 74 ... Restriction part (projection piece)

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

First embodiment

First, FIG. 1 schematically shows the entire vaporizer 11 according to an embodiment of the present invention. The carburetor 11 is used by being incorporated in a saddle-ride type vehicle such as a motorcycle. When mounted on a motorcycle, an intake duct 12 and an intake pipe 13 are connected to the carburetor 11 almost coaxially from both sides. An air cleaner (not shown) is connected to the intake duct 12. Air is introduced into the vaporizer 11 from the air cleaner through the intake duct 12. An intake port of an internal combustion engine (not shown) is connected to the intake pipe 13. In the vaporizer 11, vaporized fuel is mixed with air. An air-fuel mixture is introduced into the combustion chamber of the internal combustion engine from the intake port via the intake pipe 13.

A throttle cable 14 is connected to the vaporizer 11. The throttle cable 14 is connected to a throttle grip (not shown). The operation of the throttle grip is converted into an axial movement of the throttle cable 14. The flow rate and mixture ratio of the air-fuel mixture are adjusted according to the operation of the throttle cable 14.

The vaporizer 11 includes a vaporizer body 15. The intake duct 12 and the intake pipe 13 are connected to the carburetor body 15. The carburetor body 15 defines an intake passage that interconnects the space in the intake duct 12 and the space in the intake pipe 13. A float chamber 16 is coupled to the lower end of the vaporizer body 15. The float chamber body 16 partitions the float chamber with the vaporizer body 15 as will be described later.

A first lid member 18 is attached to the upper end of the vaporizer body 15. A fastening member, that is, a bolt 19 is used for attachment. The first lid member 18 is detachably coupled to the vaporizer body 15 with, for example, a plurality of bolts 19.

The second lid member 21 is detachably attached to the first lid member 18. The throttle cable 14 passes through the second lid member 21. The second lid member 21 is formed with a grip portion 21 a that is gripped when the second lid member 21 is attached to and detached from the first lid member 18. The gripping portion 21 a is provided at a position higher than the top of the bolt 19.

2, the second lid member 21 has a circular contour concentric with the axis of the throttle cable 14. The second lid member 21 rotates with respect to the first lid member 18 around the rotation axis Xis that overlaps the axis of the throttle cable 14 and is screwed into the first lid member 18. In the screwing, the grip portion 21a of the second lid member 21 is gripped by the operator. The bolt 19 is disposed outside the outline of the second lid member 21 and is screwed into the carburetor body 15 around an axis parallel to the rotation axis Xis.

A position sensor PS is attached to the vaporizer body 15. An operating shaft 22 is connected to the position sensor PS. The operating shaft 22 extends in the horizontal direction and is rotatably supported by the vaporizer body 15. The position sensor PS detects the rotation amount of the operating shaft 22. The rotation amount of the operating shaft 22 provides an index of the throttle valve opening, as will be described later.

A part of the operating shaft 22 is exposed to the outside of the vaporizer body 15 to form an exposed portion. A spring support piece 23 for supporting a spring member 24 described later is attached to the exposed portion. The spring support piece 23 includes a flange portion 23 a extending in the centrifugal direction from the axis along a virtual plane orthogonal to the axis of the operating shaft 22. The flange portion 23a of the spring support piece 23 is formed with a protruding piece 23b that protrudes in a direction away from the vaporizer body 15 (a direction substantially along the axial direction of the operating shaft 22). It functions as a finger hook for hooking. The projecting portion according to the present invention includes both the flange portion 23a and the projecting piece 23b. However, if the operating shaft 22 can be rotated by hooking or grasping the finger on the flange portion 23a, the projecting portion is projected. The piece 23b may not be present.

Further, the protruding portion is not limited to the configuration formed in the flange portion 23a, and a protruding portion of the spring member 24 may be used as the protruding portion by protruding a part of the spring member 24. In short, in the direction away from the carburetor main body (direction substantially along the axial center direction of the working shaft 22) or the direction away from the working shaft 22 in the radial direction, the shaft portion (the working shaft 22, the spring support piece 23, A protrusion is provided on at least a part of at least one of the spring members 24, and this protrusion only needs to have a protrusion amount that allows a finger to be hooked.

A spring member 24 is disposed between the spring support piece 23 and the vaporizer body 15. The spring member 24 is constituted by a torsion spring, for example. The spring member 24 exerts an elastic force that urges the spring support piece 23 in the first direction FR around the axis of the operating shaft 22. The first direction FR corresponds to the closing direction of the throttle valve, as will be described later. The operator hooks a finger on the projecting piece 23b provided on the flange portion 23a of the spring support piece 23, and moves the spring support piece 23 around the axis of the operating shaft 22 in the second direction SE opposite to the first direction FR. It can be rotated. The rotation of the spring support piece 23 causes the rotation of the operating shaft 22.

As shown in FIG. 3, a housing portion 25 is formed in the vaporizer body 15. A valve cylinder 26 is formed in the accommodating portion 25. The valve cylinder 26 defines a slide space 28 branched from an intake passage 27 extending in the horizontal direction. Here, the slide space 28 is shaped like a cylinder having a central axis 31 orthogonal to the central axis 29 of the intake passage 27. The central axis 31 overlaps the rotation axis Xis.

A piston-like throttle valve 32 is slidably supported in the slide space 28. Thus, the throttle valve 32 is accommodated in the accommodating portion 25. The throttle valve 32 opens and closes the intake passage 27 according to the vertical movement of the throttle valve 32. The opening degree of the intake passage 27 is adjusted according to the position of the throttle valve 32.

A string-wound spring 33 is disposed between the throttle valve 32 and the second lid member 21. The string spring 33 is sandwiched between the throttle valve 32 and the second lid member 21 and exhibits a repulsive force in the extending direction. Therefore, the string spring 33 pushes down the throttle valve 32 toward the lowest position. The throttle valve 32 at the lowest position establishes a minimum opening (for example, a closed state) in the intake passage 27.

The throttle cable 14 is connected to the throttle valve 32. An insertion path 34 for the throttle cable 14 is formed on the rotation axis Xis in the second lid member 21. The throttle cable 14 is inserted into the insertion passage 34 so as to be movable back and forth in the axial direction. When the throttle cable 14 is pulled and the throttle valve 32 is displaced upward against the repulsive force of the string spring 33, the opening of the intake passage 27 increases.

The first lid member 18 covers the open end of the accommodating portion 25. An opening 35 through which the throttle valve 32 can be inserted is formed in the first lid member 18. A boss 36 surrounding the opening 35 is formed in the first lid member 18. The second lid member 21 is screwed to the boss 36. The second lid member 21 closes the opening 35. An insertion path 34 is formed on the rotation axis of the second lid member 21 that rotates by screwing. The end of the valve cylinder 26 protrudes upward from the mating surface 37 between the first lid member 18 and the vaporizer body 15 toward the outside.

In the intake passage 27, a choke valve 38 is disposed upstream of the throttle valve 32. The choke valve 38 is configured as a so-called butterfly type. The choke valve 38 rotates about an axis extending in the horizontal direction, and opens and closes the intake passage 27 according to the rotation.

In the float chamber 39, a float 41 having a specific gravity smaller than that of the fuel is accommodated. The float 41 moves up and down according to the fuel level. A support plate 42 is coupled to the float 41. The support plate 42 is disposed in the float chamber 39 so as to be swingable around the support shaft 43. The support plate 42 supports the float valve 44 from below. The float valve 44 closes the fuel inflow passage 45 at a predetermined liquid level. When the fuel level drops, the float valve 44 opens. The fuel flows into the float chamber 39 from the fuel inflow passage 45 in response to opening of the valve. In this way, the fuel that forms the oil level at a constant liquid level is always stored in the float chamber 39. A fuel conduit extending from the fuel tank is connected to the fuel inflow passage 45. Fuel is supplied to the fuel inflow passage 45 from a fuel tank.

In the float chamber 39, a main jet 46 and a slow jet 47 are arranged in parallel. A main nozzle 48 that opens to the intake passage 27 is connected to the main jet 46. The fuel is measured by the main jet 46 and ejected from the main nozzle 48. The slow jet 47 is connected to a slow nozzle 49 that opens to the intake passage 27 downstream of the main nozzle 48. The fuel is measured by the slow jet 47 and ejected from the slow nozzle 49.

The needle valve 51 is connected to the throttle valve 32. The needle valve 51 is disposed coaxially with the throttle valve 32 and protrudes downward from the lower end of the throttle valve 32. The needle valve 51 is inserted into the main nozzle 48. The needle valve 51 moves up and down in the main nozzle 48 according to the vertical movement of the throttle valve 32.

As shown in FIG. 4, a main air bleed passage 52 is formed in the vaporizer body 15. The first passage 52a of the main air bleed passage 52 opens to the main jet 46 at the tip. The first path 52a is formed by a drill hole inclined downward. The outer end of the first path 52a is closed by a closing member 53a fitted into the vaporizer body 15.

As shown in FIG. 5, a slow air bleed passage 54 is formed in the vaporizer body 15. The first passage 54 a of the slow air bleed passage 54 opens to the slow jet 47 at the tip. The first passage 54a is formed by a drill hole inclined downward. The outer end of the first path 54 a is closed by a closing member 53 b that is fitted into the vaporizer body 15.

The second path 54b of the slow air bleed path 54 is connected to the first path 54a at the tip. The second path 54b is formed by a drill hole extending in the horizontal direction. The outer end of the second path 54b is closed by a closing member 53c fitted into the vaporizer body 15.

6, an air bleed common path 55 is formed in the vaporizer body 15. The common path 55 defines a cylindrical space having a central axis 55a extending in the vertical direction. A valve body 56 is accommodated in the common path 55. The valve body 56 is slidably brought into surface contact with the slide surface 55b of the common path 55. The valve body 56 moves up and down in the common path 55 in the axial direction. The second path 52 b of the main air bleed path 52 opens at the slide surface 55 b of the common path 55. The second path 54 b is formed by a drill hole extending in the horizontal direction and crossing the common path 55. The tip of the drill hole is connected to the first path 52 a of the main air bleed passage 52. Thus, the common path 55 is connected to the main jet 46 via the main air bleed path 52.

The third path 54c of the slow air bleed passage 54 is similarly opened at the slide surface 55b. The opening 54 d of the slow air bleed passage 54 is disposed at a position higher than the opening 52 c of the main air bleed passage 52. The third path 54 c is formed by a drill hole extending in the horizontal direction and crossing the common path 55. The tip of the drill hole is connected to the second path 54 b of the slow air bleed passage 54. The common path 55 is connected to the slow jet 47 through the slow air bleed path 54.

The introduction path 59 opens in the common path 55. The opening of the introduction path 59 is disposed at a position lower than the opening 52 c of the main air bleed passage 52. The introduction path 59 is connected to the intake passage 27 on the upstream side of the throttle valve 32. Air is introduced into the common passage 55 from the intake passage 27 through the introduction passage 59.

An electric motor 61 is connected to the valve body 56. The drive shaft 62 of the electric motor 61 is threaded. The thread groove meshes with the thread groove of the female thread member 63 fixed to the valve body 56. The rotational movement of the drive shaft 62 is converted into vertical movement of the female screw member 63 by the action of the thread groove. Thus, the vertical movement of the valve body 56 is controlled according to the rotation control of the electric motor 61.

As shown in FIG. 7, the valve body 56 has a window hole 64 that overlaps the opening 54d of the slow air bleed passage 54 according to the sliding operation, and an outer edge that overlaps the opening 52c of the main air bleed passage 52 according to the sliding operation. 65 is partitioned. The outer edge 65 forms a notch. The opening area of the main air bleed passage 52 and the opening area of the slow air bleed passage 54 are controlled according to the vertical movement of the valve body 56.

As shown in FIG. 8, an arm portion 67 connected to the throttle valve 32 is accommodated in the accommodating portion 25 of the carburetor body 15. The arm portion 67 is fixed to the operating shaft 22 so as not to be relatively rotatable. The arm portion 67 extends in the centrifugal direction from the axis of the operating shaft 22. The arm portion 67 swings around the axis of the operating shaft 22 as the operating shaft 22 rotates. A roller member 69 is attached to the tip of the arm portion 67. The roller member 69 can rotate around a rotation axis parallel to the axis of the operating shaft 22.

The slider 71 is fixed to the throttle valve 32. The slider 71 is disposed in a guide window 72 that is partitioned into the valve cylinder 26 and extends linearly in the sliding direction of the throttle valve 32. The slider 71 enters the guide window 72 and guides the sliding movement of the throttle valve.

The connecting piece 73 is fixed to the slider 71 integrally. The connecting piece 73 protrudes outward from the valve cylinder 26. The connecting piece 73 moves up and down together with the throttle valve 32. The connecting piece 73 is partitioned with a support surface 73 a that extends in a virtual plane orthogonal to the central axis 55 a of the common path 55. The roller member 69 is received by the support surface 73a. As a result, the vertical movement of the throttle valve 32 is converted into the rotational motion of the operating shaft 22.

When the urging force of the spring member 24 is applied in the first direction FR around the axis of the operating shaft 22, the roller member 69 is pressed against the support surface 73 a of the connecting piece 73. The roller member 69 continues to be in contact with the support surface 73a because the roller member 69 rotates around the rotation axis parallel to the axis of the operating shaft 22 when the throttle valve 32 moves up and down by the urging force of the spring member 24. Can do. Thus, the movement amount of the throttle valve 32 is converted into the rotation amount of the operating shaft 22. Based on the rotation amount of the operating shaft 22, the position sensor PS specifies the opening degree of the throttle valve 32. The swing of the arm portion 67 is restricted by the connecting piece 73. If no force is applied from the throttle cable 14 to the throttle valve 32, the throttle valve 32 moves downward as much as possible by the action of the string spring 33.

In the housing portion 25, the vaporizer body 15 is integrally formed with a projecting piece 74 on the track of the arm portion 67 defined around the axis of the operating shaft 22. The projecting piece 74 is opposed to the arm portion 67 with an interval when the throttle valve 32 is lowered to the maximum. Here, when the connecting piece 73 is removed, the restriction of the connecting piece 73 with respect to the swing of the arm portion 67 is removed, and the arm portion 67 further rotates in the first direction FR by the action of the urging force of the spring member 24. Then, it is received by the projecting piece 74. Even if the arm portion 67 contacts the protruding piece 74, the collision between the roller member 69 and the vaporizer body 15 is avoided, and adverse effects on the roller member 69 and the arm mechanism due to the collision can be suppressed. The protrusion 74 restricts the amount of rotation of the arm portion 67 so that the tip of the arm portion 67 is not in contact with the carburetor body 15 when the throttle valve 32 is detached from the housing portion 25. It functions as a part.

On the other hand, a second regulating piece 75 is formed in the first lid member 18 in the accommodating portion 25. The restricting piece 75 is formed integrally with the first lid member 18 on the track of the arm portion 67 defined around the axis of the operating shaft 22. When the arm portion 67 rotates around the axis of the operating shaft 22 in the second direction SE and the roller member 69 is retracted from the track of the connecting piece 73, the restricting piece 75 receives the arm portion 67. Thus, the arm mechanism ARM is configured to be able to release the connection between the tip of the arm portion 67 and the throttle valve 32 by rotating the arm portion 67 against the urging of the spring member 24. Even if the arm portion 67 rotates to the maximum in the second direction SE and the arm portion 67 contacts the regulating piece 75, the collision between the roller member 69 and the vaporizer body 15 is avoided. The restricting piece 75 is arranged so that the tip of the arm portion 67 is not in contact with the carburetor main body 15 even when the arm portion 67 is moved farthest from the protruding piece 74 when the throttle valve 32 is put in and out of the housing portion 25. The amount of rotation of the portion 67 is restricted.

As shown in FIG. 9, the arm mechanism ARM according to the present embodiment includes an arm portion 67, an operation shaft 22, a spring support piece 23, and a spring member 24. At this time, as shown in FIG. 10, when the opening 35 is viewed from the insertion direction of the throttle valve 32, the contact portion between the arm mechanism ARM and the throttle valve 32, that is, the contact between the roller member 69 and the connecting piece 73. The opening 35 is formed in such a size that the portion can be visually recognized.

When the carburetor 11 is mounted on a motorcycle, the carburetor 11 is delivered to a finished vehicle manufacturer in a state of being disconnected from the throttle cable 14. The assembly of the throttle cable 14 is performed in the vehicle production process. The operator removes the second lid member 21 when assembling the throttle cable 14. Upon removal, the operator holds the holding portion 21a, rotates the second lid member 21 with respect to the first lid member 18 around the rotation axis Xis, and releases the screwing.

Next, the operator removes the string spring 33 and the throttle valve 32 from the carburetor body 15. At this time, for example, as shown in FIG. 10, the operator visually moves to the spring support piece 23 in the second direction SE around the axis of the operating shaft 22 while visually recognizing the contact portion between the roller member 69 and the connecting piece 73. In order to apply a forcing force, the spring support piece 23 is forcibly rotated by hooking a finger on the protruding piece 23 b provided on the spring support piece 23. When the roller member 69 is separated from the connecting piece 73 and the arm portion 67 rotates to the maximum in the second direction SE, the arm portion 67 is received by the regulating piece 75. The roller member 69 and the arm part 67 are retracted from the track of the connecting piece 73. The throttle valve 32 is pulled out from the opening 35 of the first lid member 18.

The throttle valve 32 is coupled to the tip of the throttle cable 14 in a state where the throttle cable 14 is inserted into the insertion passage 34 and the string spring 33 of the second lid member 21. After the coupling, the throttle valve 32 is returned to the housing portion 25 of the carburetor body 15. At this time, the contact between the arm portion 67 and the restricting piece 75 may be maintained prior to the insertion of the throttle valve 32.

When the throttle valve 32 is set in the accommodating portion 25, the operator relaxes the forcing force on the spring support piece 23. As a result, the arm portion 67 swings in the first direction FR around the axis of the operating shaft 22 according to the elastic force of the spring member 24. The roller member 69 is received by a connecting piece 73 fixed to the throttle valve 32. The operator can proceed with the work while observing the connection relationship between the roller member 69 and the connecting piece 73 through the opening 35. Thus, the connection between the roller member 69 and the connecting piece 73 is established. Once the connection is established, the spring support piece 23 is completely released from the forcing force.

Subsequently, the operator screws the second lid member 21 into the first lid member 18. Thus, the assembly of the throttle cable 14 to the carburetor 11 is completed. Thereafter, the carburetor 11 is mounted on the motorcycle body.

In a parts supplier that delivers the carburetor 11 to a finished vehicle maker, when the throttle valve 32 and the arm part 67 are accommodated in the accommodating part 25, each part is removed from the wide open end of the accommodating part 25. 15 and good workability can be ensured. Further, a manufacturer or user of a finished vehicle to which the carburetor 11 has been delivered can assemble the throttle cable 14 to the carburetor 11 by detaching the second lid member 21 from the first lid member 18, such as a screw. The second lid member 21 can be attached and detached without going through the fastening member removal work and the fastening work, and workability and work efficiency can be improved. Also, maintenance work such as replacement of the throttle cable 14 can be performed efficiently as well.

Since at least a part of the grip portion 21 a of the second lid member 21 is provided at a position higher than the top of the bolt 19, the bolt 19 is obstructed when the second lid member 21 is attached to and detached from the first lid member 18. Instead, the grip portion 21a can be easily gripped. The second lid member 21 can be attached and detached more easily.

The opening 35 of the first lid member 18 is formed in such a size that the connection portion between the roller member 69 and the connecting piece 73 can be visually recognized when the opening 35 is viewed from the insertion direction of the throttle valve 32. After the throttle cable 14 is connected to the valve 32, when returning the throttle valve 32 from the opening 35 to the accommodating portion 25, the operator can visually check the connection state of the connecting portion between the roller member 69 and the connecting piece 73. Workability is further improved.

In the vaporizer 11, the projecting piece 23 b is formed on the exposed portion of the operating shaft 22, and the operating shaft 22 can be rotated by hooking a finger on the projecting piece 23 b, so that the connection work between the roller member 69 and the coupling piece 73 When performing, the arm part 67 can be rotated by hooking a finger on the protruding piece outside the vaporizer main body 15 to connect the roller member 69 and the connecting piece 73, and the workability is further improved.

In the present embodiment, the projecting piece is provided in the exposed portion where a part of the operating shaft 22 is exposed to the outside of the carburetor main body. However, the present invention is not limited to this. It is good also as a structure which provides a protrusion piece in the non-exposed part which is not exposed outside. In this case, it is desirable that the opening provided in the first lid member has a size that allows the protruding piece to be accessed from the outside. An example is shown in FIG. The protruding piece 77 is integrated with the arm portion 67, and extends from the upper surface of the arm portion 67 in the centrifugal direction of the axis of the operating shaft 22. At this time, the opening 35 extends from the lowest position where the arm portion 67 contacts the projecting piece 74 to the position where the arm portion 67 swings in the second direction SE and the roller member 69 retracts from the track of the connecting piece 73. It is formed in a size that can be accessed by an operator's fingertip.

As described above, the end of the valve cylinder 26 is formed so as to protrude upward from the mating surface 37 between the first lid member 18 and the vaporizer body 15. Accordingly, when the second lid member 21 is removed, the valve cylinder 26 is exposed so as to protrude to the outside, so that the operation of inserting and removing the throttle valve 32 from the valve cylinder 26 can be easily performed. Can be improved.

In the carburetor 11, the insertion path 34 of the throttle cable 14 is formed on the rotation axis Xis of the second lid member 21. Therefore, when the second lid member 21 is screwed, Interference between the cable 14 and the insertion path 34 can be suppressed, and the second lid member 21 can be attached and detached more easily.

As described above, the arm mechanism ARM includes the spring member 24 that urges the throttle valve 32 in the closing direction, and rotates the arm portion 67 against the urging of the spring member 24 to thereby rotate the tip of the arm portion 67. The roller member 69 and the coupling piece 73 fixed to the throttle valve 32 are configured to be able to be disconnected. The accommodating portion 25 has a rotation amount of the arm portion 67 so that the roller member 69 at the tip of the arm portion 67 is not in contact with the vaporizer body 15 when the throttle valve 32 is detached from the accommodating portion 25. A projecting piece 74 to be regulated is formed. Therefore, when the throttle valve 32 is removed from the accommodating portion 25, the rotation amount of the arm portion 67 can be regulated so that the roller member 69 at the tip of the arm portion 67 is not in contact with the vaporizer body 15. The contact between the 67-end roller member 69 and the vaporizer body 15 can be avoided.

In the present embodiment, the male screw portion is formed on the boss 36 as the engaging portion formed integrally with the first lid member, and the female screw is used as the engaged portion formed integrally with the second lid member. The portion is formed on the inner wall surface of the second lid member 21. However, the present invention is not limited to this, and the first lid member 18 may have a female screw portion and the second lid member 21 may have a male screw portion. Further, a claw piece as an engaging portion is integrally formed on one of the first lid member 18 and the second lid member 21, and either one of the first lid member 18 or the second lid member 21 is formed. The lid member may be integrally formed with a groove, a notch or the like for engaging the claw piece as an engaged portion. In short, the coupling between the first lid member 18 and the second lid member 21 is achieved only by the engaging portion formed integrally with the first lid member 18 and the engaged portion integrally formed with the second lid member 21. Any configuration that can maintain the state may be used. With this configuration, the second lid member 21 can be attached to and detached from the first lid member 18 with a simple configuration without using a fastening member such as a screw. it can.

In addition, the first lid member 18 and the second lid member 21 in the present embodiment are made of metal, but may be made of resin.

Claims

A piston-like throttle valve (32) that opens and closes an intake passage (27) formed in the carburetor body (15) by operating the throttle cable (14);
A carburetor comprising: an arm portion (67) connected to the throttle valve (32); and an arm mechanism having a shaft portion (22) rotatably supported by the carburetor body (15).
The throttle valve (32) and the arm part (67) are housed in a housing part (25) formed in the carburetor body (15), and
A first lid member (18) covering the open end of the accommodating part (25) is attached to the vaporizer body (15),
The first lid member (18) has an opening (35) through which the throttle valve (32) can be inserted,
A second lid member (21) that covers the opening (35) and has an insertion passage (34) through which the throttle cable (14) can be inserted is detachable from the first lid member (18). A vaporizer characterized by being attached.
2. The vaporizer according to claim 1, wherein only the engaging portion formed integrally with the first lid member (18) and the engaged portion formed integrally with the second lid member (21). The vaporizer is characterized in that the coupling state of the first lid member (18) and the second lid member (21) is maintained.
The vaporizer according to claim 1, wherein the first lid member (18) is detachably attached to the vaporizer body (15) by a fastening member (19), and the second lid member (21). Is formed with a gripping portion (21a) that is gripped when the second lid member (21) is attached to and detached from the first lid member (18), and at least one of the gripping portions (21a) is formed. The carburetor is characterized in that the portion is provided at a position higher than the top of the fastening member (19).
The carburetor according to claim 1, wherein the connecting portion between the arm mechanism and the throttle valve (32) is visible when the opening (35) is viewed from the insertion direction of the throttle valve (32). Further, the vaporizer is characterized in that the opening (35) is formed.
The carburetor according to claim 1, wherein at least a part of the shaft portion (22) in the arm mechanism is provided with a projecting portion (23) projecting from the shaft portion (22), and the projecting portion (23 ) Is operated from the outside of the vaporizer body (15), so that the shaft portion (22) can be rotated.
The carburetor according to claim 1, wherein a boss (36) surrounding the opening (35) is formed in the first lid member (18), and the second lid member (21) is the boss ( 36) The carburetor characterized in that the insertion passage (34) is formed on the rotation axis (Xis) of the second lid member (21) that is screwed into the screw 36) and rotated by the screwing.
2. The carburetor according to claim 1, wherein the arm mechanism includes a spring member (24) that biases the throttle valve (32) in a closing direction, and resists the bias of the spring member (24). The arm portion (67) is configured to be able to release the connection between the tip portion of the arm portion (67) and the throttle valve (32) by rotating the arm portion (67),
The arm so that the tip of the arm (67) is not in contact with the carburetor body (15) when the throttle valve (32) is detached from the housing (25). A carburetor characterized in that a restricting portion (74) for restricting the amount of rotation of the mechanism is formed in the accommodating portion (25).