CN211448844U

CN211448844U - Throttle valve and choke valve control linkage mechanism and diaphragm type carburetor thereof

Info

Publication number: CN211448844U
Application number: CN201921794537.4U
Authority: CN
Inventors: 陈其安; 贾永成
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-09-08
Anticipated expiration: 2029-10-23

Abstract

The utility model relates to the technical field of carburetors, in particular to a choke valve and choke valve control linkage mechanism and a diaphragm carburetor, which comprises a choke valve assembly and a choke valve assembly, wherein the choke valve assembly can be linked with the choke valve assembly; the choke valve assembly comprises a choke valve, a choke valve handle and a fast idle speed handle, the choke valve assembly comprises a throttle valve and a throttle valve handle, a plurality of linkage surfaces capable of being linked with the throttle valve handle are arranged on the choke valve handle, and the fast idle speed handle comprises a clamping groove, a first vertex and a plurality of linkage edges; the throttle valve handle is provided with a first linkage shaft, and when the fast idling handle rotates to the position where the first top point abuts against the outer surface of the first linkage shaft, the throttle valve handle drives the throttle valve to rotate to the position of the maximum opening degree in the linkage process. The utility model has the advantages that: the throttle handle has simple structure and is convenient to process and assemble.

Description

Throttle valve and choke valve control linkage mechanism and diaphragm type carburetor thereof

Technical Field

The utility model relates to a carburetor technical field, in particular to throttle and choke valve control link gear and diaphragm formula carburetor thereof.

Background

The carburetor is a mechanical device which mixes gasoline and air in a certain proportion under the action of vacuum generated by the operation of an engine. The existing carburettors on the market are of various types, have different structures, basically have the same function and principle, and mainly control the mixture of air and fuel entering an engine, wherein the flow rate of the mixture is determined by the opening degree of a throttle valve, and the opening degree of the throttle valve of the carburetor is changed by pulling an accelerator trigger of the engine so as to control the amount of the mixture entering the engine.

At present, a linkage mechanism is arranged on a carburetor, and the movement of a throttle valve and a choke valve is controlled through the linkage mechanism so as to realize the adjustment of the opening degree of the throttle valve. The linkage mechanism at least comprises a choke valve handle, a fast idle speed handle and a throttle valve handle, wherein the choke valve handle, the fast idle speed handle and the throttle valve handle are linked with each other to achieve the aim of controlling the movement of the throttle valve and the choke valve. However, in the prior art, in order to enable the throttle valve handle to participate in linkage, a plurality of surfaces and bending structures are arranged on the throttle valve handle, so that the structure is complex and the processing cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a throttle and choke control linkage mechanism and a diaphragm carburetor that have a simple structure and are low in cost.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

a throttle valve and choke valve control linkage mechanism of a diaphragm type carburetor comprises a choke valve assembly and a throttle valve assembly, wherein the choke valve assembly can be linked with the throttle valve assembly;

the choke valve assembly comprises a choke valve, a choke shaft, a choke valve handle, a fast idling handle and a torsion spring, the choke valve is installed at one end of the choke shaft, the choke valve handle is installed at the other end of the choke shaft, and the fast idling handle is installed on the choke shaft and can rotate on the choke shaft;

the throttle valve assembly comprises a throttle valve, a throttle shaft and a throttle valve handle, the throttle valve is mounted at one end of the throttle shaft, the throttle valve handle is mounted at the other end of the throttle shaft and used for being linked with the throttle valve handle and the fast idle handle, the torsion spring is sleeved on the throttle shaft, one end of the torsion spring is fixed on the fast idle handle, and the other end of the torsion spring is fixed on the throttle shaft to provide acting force for resetting of the fast idle handle;

the choke valve handle is provided with a plurality of linkage surfaces which can be linked with the throttle valve handle, and the fast idling handle comprises a clamping groove, a first vertex and a plurality of linkage edges; the throttle valve handle is provided with a first linkage shaft, and when the fast idling handle rotates to the first vertex to prop against the outer surface of the first linkage shaft, the throttle valve handle drives the throttle valve to rotate to the maximum opening position in the linkage process; meanwhile, when the choke valve handle is linked with the throttle valve handle, the choke valve can be ensured to be opened by an angle under the condition of full closing, and in the state, the throttle valve handle and the clamping groove are not in a linked state, and a gap is formed between the first linkage shaft and the fast idling handle.

It can be understood that the first linkage shaft is arranged on the throttle valve handle, so that linkage between the first linkage shaft and the fast idling handle is realized, convenience and a simple structure are achieved, a complex linkage surface is prevented from being processed on the throttle valve handle, and cost is effectively reduced.

In one embodiment, the plurality of coupling surfaces comprises a first coupling surface, the plurality of coupling edges comprises a first coupling edge, the throttle handle is further provided with a second coupling shaft, and when the choke handle rotates to enable the first coupling surface to be in contact with the outer surface of the second coupling shaft, the first coupling shaft enters the first coupling edge of the fast idling handle and is not in contact with the clamping groove.

It can be understood that the first linkage shaft enters the first linkage edge of the fast idle handle and is not in contact with the clamping groove, namely when the first linkage surface is in contact with the outer surface of the second linkage shaft, the first linkage shaft is not in contact with the fast idle handle, so that the first linkage shaft does not influence the movement of the choke valve, and the consistency of the choke valve is better in the state.

In one embodiment, the first coupling surface has a recess formed therein, and the choke valve is in a fully closed position and the throttle valve is opened at an angle when the choke valve handle is rotated until the second coupling shaft is fully received in the recess.

In one embodiment, the first linkage shaft and the second linkage shaft are spaced apart on the throttle handle.

In one embodiment, the first linkage shaft and the second linkage shaft are both vertically arranged, and the first linkage shaft and the second linkage shaft are parallel to each other.

In one embodiment, the throttle handle is provided with a first mounting hole and a second mounting hole, one end of the first linkage shaft and one end of the second linkage shaft are respectively mounted in the first mounting hole and the second mounting hole, and the other end of the first linkage shaft and the other end of the second linkage shaft respectively protrude out of the surface of the throttle handle.

It can be understood that the first mounting hole and the second mounting hole are formed, so that the first linkage shaft and the second linkage shaft are respectively mounted in the first mounting hole and the second mounting hole, the assembly is convenient and simple, the processing is easier, and the production cost is effectively saved.

In one embodiment, the first linkage shaft and the second linkage shaft are respectively provided with the throttle handle in an integrated manner.

It will be appreciated that the provision of a one-piece construction may facilitate the manufacture and manufacture of the throttle handle.

In one embodiment, the choke handle is a split handle.

In one embodiment, the choke handle includes an operating handle and a linkage handle, both of which are fixed to the choke shaft, the operating handle drives the choke shaft to rotate, and the linkage handle rotates with the choke shaft and is linked with the second linkage shaft.

The utility model discloses still provide following technical scheme:

a diaphragm carburetor comprises a body, a throttle valve and a choke valve control linkage mechanism, wherein the throttle valve and choke valve control linkage mechanism is installed on the body.

Compared with the prior art, the diaphragm type carburetor throttle valve and choke valve control linkage mechanism has the advantages that the first linkage shaft is arranged on the throttle valve handle, so that linkage between the diaphragm type carburetor throttle valve and the fast idle speed handle is realized through the first linkage shaft, convenience and simple structure are realized, a complex linkage surface is prevented from being processed on the throttle valve handle, and the cost is effectively reduced.

Drawings

Fig. 1 is a schematic structural view of a throttle and choke valve control linkage of a diaphragm carburetor according to the present invention.

Fig. 2 is an exploded view of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of the present invention as shown in fig. 1.

Fig. 3 is an exploded view of the throttle assembly of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 1 according to the present invention.

Fig. 4 is an exploded view of the choke shaft assembly of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor according to the present invention as shown in fig. 1.

Fig. 5 is a schematic view of the throttle handle of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 1 according to the present invention.

Fig. 6 is a schematic view of the construction of the fast idle handle of the preferred embodiment of fig. 1 of the throttle and choke control linkage of the diaphragm carburetor according to the present invention.

Fig. 7 is a schematic view of the choke handle of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 1 according to the present invention.

Fig. 8 is a schematic view of another embodiment of the choke handle of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 1 according to the present invention.

Fig. 9a is a schematic view of the preferred embodiment of the choke valve and choke valve control linkage of the diaphragm carburetor of fig. 1, illustrating the choke valve fully open and fully closed, according to the present invention.

Fig. 9b is a schematic view of the preferred embodiment of the choke valve and choke valve control linkage of the diaphragm carburetor of fig. 1, illustrating the choke valve fully open and fully closed, in accordance with the present invention.

Fig. 10a is a diagram of the linkage of the choke handle and the fast idle handle of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor according to the present invention as shown in fig. 1.

Fig. 10b is a view of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 10a showing the quick idle handle in contact with the throttle handle in accordance with the present invention.

Fig. 11a is a diagram showing the state of maximum opening (threshold state) when the throttle valve is rotated to be interlocked in the preferred embodiment of the throttle valve and choke valve control interlocking mechanism of the diaphragm carburetor according to the present invention shown in fig. 1.

Fig. 11b is a diagram of the critical state of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 11a showing the linkage of the fast idle handle and the throttle handle according to the present invention.

Fig. 12a is a view of the throttle handle and choke handle of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 1 just prior to contact according to the present invention.

Fig. 12b is a view of the throttle handle and choke handle linkage of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 12a according to the present invention.

Fig. 12c is a view of the throttle handle and fast idle handle linkage of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 12a according to the present invention.

Fig. 13a is a view of the preferred embodiment of the choke valve control linkage of the diaphragm carburetor of fig. 1, shown in a fully closed position, in accordance with the present invention.

Fig. 13b is a view of the throttle handle and choke handle linkage of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 13a according to the present invention.

Fig. 13c is a view of the throttle handle and fast idle handle linkage of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 13c according to the present invention.

Fig. 14 is a view of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 1 showing the choke handle rotated clockwise with the throttle handle in contact with the fast idle handle and the choke handle in accordance with the present invention.

Fig. 15a is a view of the throttle handle of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 1 shown in a stopped state in accordance with the present invention.

Fig. 15b is a view of the throttle handle and choke handle linkage of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 15a according to the present invention.

Fig. 15c is a view of the throttle handle and fast idle handle linkage of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 15a according to the present invention.

Fig. 16 is a diagram of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 1 showing the fast idle handle and throttle handle linkage when the choke valve is fully open according to the present invention.

Fig. 17 is a state diagram of the throttle handle of the preferred embodiment of the throttle and choke control linkage of the diaphragm carburetor of fig. 1, shown in the critical state, rotated from the fast idle state to the wide open state.

Fig. 18 is a state diagram of the preferred embodiment of the diaphragm carburetor throttle and choke control linkage of fig. 1, with both the choke and throttle valves processing full opening, in accordance with the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1, FIG. 1 illustrates a block diagram of a carburetor 100 according to an embodiment of the present invention. The carburetor 100 includes a body 14, an air inlet 141 and an air throttle (not shown) formed in the body 14, and a throttle and choke valve control linkage 20 mounted to the body 14 for controlling the opening of the air inlet 141 and the air throttle. Alternatively, the carburetor may be a diaphragm carburetor or other type of carburetor.

Preferably, in the present embodiment, the carburetor is a diaphragm carburetor, the linkage 20 is a throttle and choke valve control linkage of the diaphragm carburetor, and the throttle and choke valve control linkage 20 of the diaphragm carburetor is taken as an illustration object, specifically, the structure of the linkage 20 and the operation principle thereof are illustrated.

The throttle and choke valve control linkage 20 comprises a choke valve assembly 21 and a throttle valve assembly 22, wherein the choke valve assembly 21 is used for controlling the opening degree of the air inlet 141, the throttle valve assembly 22 is used for controlling the opening degree of the air throttle, and the choke valve assembly 21 can be linked with the throttle valve assembly 22 to jointly control the opening degrees of the air inlet 141 and the air throttle.

Further, as shown in fig. 2-4, the choke assembly 21 includes a choke valve 9, a choke shaft 7, a choke valve handle 13, a fast idle handle 11 and a torsion spring 12, the choke shaft 7 is rotatably installed on the body 14, the choke valve 9 is installed at one end of the choke shaft 7 and located at the air inlet 141, the choke valve 9 rotates along with the choke shaft 7 to control the opening degree of the air inlet 141, the choke valve handle 13 is installed at the other end of the choke shaft 7, and the fast idle handle 11 is installed on the choke shaft 7 and can rotate on the choke shaft 7.

Throttle valve subassembly 22 includes throttle valve 3, throttle shaft 1 and throttle valve handle 5, and throttle shaft 1 installs on body 14 with rotating, throttle valve 3 install in the one end of throttle shaft 1 and lie in throttle mouth department, and throttle valve 3 rotates along with throttle shaft 1 to control throttle mouth aperture, throttle valve handle 5 install in the other end of throttle shaft 1, be used for with choke valve handle 13 and fast idle handle 11 linkage, torsional spring 12 cover is established on choke shaft 7, and torsional spring 12's one end is fixed on fast idle handle 11, and the other end is fixed at throttle shaft 1, for the reset of fast idle handle 11 provides the effort.

Further, as shown in fig. 5-7, the choke handle 13 is provided with a plurality of coupling surfaces 131 capable of being coupled with the throttle handle 5, and the fast idle handle 11 includes a slot 11-3, a first vertex 11-5 and a plurality of coupling edges 111; the throttle valve handle 5 is provided with a first linkage shaft 5-3, and when the fast idling handle 11 rotates to the position where the first vertex 11-5 props against the outer surface of the first linkage shaft 5-3, the throttle valve handle 5 drives the throttle valve 3 to rotate to the maximum opening position in the linkage process; meanwhile, when the choke valve handle 13 is linked with the throttle valve handle 5, the choke valve 9 can be ensured to open the throttle valve 3 by an angle under the condition of full closing, and in this state, the throttle valve handle 5 and the clamping groove 11-3 are not in a linkage state, and a gap is formed between the first linkage shaft 5-3 and the fast idle handle 11, namely, at this time, the fast idle handle 11 does not influence the throttle valve handle 5, so that the throttle valve 3 can keep the opening. When the engine is started, the choke valve 9 is opened after the engine sends a POP sound, the choke valve handle 13 is separated from the throttle valve handle 5, and the throttle valve handle 5 is coupled with the fast idling handle 11 at the clamping groove 11-3, so that the consistency of the throttle opening of the throttle valve 3 is good, and the starting performance of the engine and the consistency of the fast idling speed are greatly improved.

It can be understood that the first linkage shaft 5-3 is arranged on the throttle handle 5, so that linkage with the fast idle handle 11 is realized through the first linkage shaft 5-3, convenience and simple structure are realized, a complex linkage surface is prevented from being processed on the throttle handle 5, and cost is effectively reduced.

When the choke valve 9 is rotated from the open position to the fully closed position, the throttle and choke control linkage 20 automatically opens the throttle valve 3 to a position greater than the fast idle position, making engine starting easier.

Further, the throttle valve 3 is fixed to the throttle shaft 1 by a screw 2, and the choke valve 9 is fixed to the choke shaft 7 by a screw 8.

The air-saving shaft 1 is provided with a non-circular surface 1-1 and a non-circular surface 1-2, the throttle handle 5 is provided with a non-circular surface 5-1 and a non-circular surface 5-2, and the non-circular surface 1-1, the non-circular surface 1-2, the non-circular surface 5-1 and the non-circular surface 5-2 are matched and fastened by an upper screw 6, so that the connection of the air-saving shaft 1 and the throttle handle 5 is realized.

Preferably, as shown in fig. 3, the throttle shaft 1 is provided with a gasket 4, and the gasket 4 is matched with the screw 6 to ensure that the throttle handle 5 is more stably installed.

The choke lever 13 is used to rotate the choke valve 9 from the fully open to the fully closed or from the fully closed to the fully open position and is fixed to the choke shaft 7. In this embodiment, as shown in FIG. 4, the non-circular surfaces 13-1 and 13-2 of the choke handle 13 are engaged with the non-circular surfaces 7-1 and 7-2 of the choke shaft 7, respectively, to rotate the choke shaft 7.

Further, a choke valve shaft sleeve 10 is arranged at the joint of the fast idle handle 11 and the choke valve shaft 7. The fast idle handle 11 is inserted on the choke shaft 7 deflected by a torsion spring 12 and has a free end which can oscillate in a path of travel which is coplanar and crosswise to the path of travel of the free end of the throttle handle 5.

One or both of the choke handle 13 and the fast idle handle 11 is provided with a boss operable to impart co-rotation of the fast idle handle 11 toward the engaged position by connecting the choke handle 13 to one of the choke handle 13 and the fast idle handle 11, the choke handle 13 causing the choke valve 9 to close.

Specifically, in the present embodiment, as shown in fig. 6 and 7, the choke lever 13 is provided with a boss 13-5, and the fast idle lever 11 is provided with a boss 11-6.

Further, the plurality of coupling surfaces 131 includes a first coupling surface 13-4, the plurality of coupling edges 111 includes a first coupling edge 11-4, the throttle handle 5 is further provided with a second coupling shaft 5-4, and when the choke handle 13 is rotated to make the first coupling surface 13-4 contact with the outer surface of the second coupling shaft 5-4, the first coupling shaft 5-3 enters the first coupling edge 11-4 of the fast idle handle 11 and does not contact with the card slot 11-3.

A groove 13-3 is formed in the first linkage surface 13-4 in a concave mode, when the choke valve handle 13 rotates until the second linkage shaft 5-4 completely enters the groove 13-3, the choke valve 9 is in a fully closed state, and the throttle valve 3 is opened at an angle. It will be appreciated that the provision of the recess 13-3 positions the second coupling shaft 5-4 so that the angle at which the throttle valve 3 is opened is consistent. It is understood that the "opening angle" in the present embodiment refers to the opening degree of the throttle valve 3.

Further, the linkage edge 111 further comprises a second linkage edge 11-1 and a third linkage edge 11-2, the second linkage edge 11-1 is located on one side of the boss 11-6, and the third linkage edge 11-2 is linked with the second linkage shaft 5-4. The coupling faces 131 further include a second coupling face 13-6, a third coupling face 13-7; the second coupling surface 13-6 is located on one side of the boss 13-5 and is used for being matched with the second coupling edge 11-1, and the third coupling edge 13-7 is coupled with the second coupling shaft 5-4.

Preferably, the first linkage shaft 5-3 and the second linkage shaft 5-4 are arranged on the throttle handle 5 at intervals. The first linkage shaft 5-3 and the second linkage shaft 5-4 are both vertically arranged, and the first linkage shaft 5-3 and the second linkage shaft 5-4 are parallel to each other. In other embodiments, the axis of the first linkage shaft 5-3 and the axis of the second linkage shaft 5-4 may not be parallel.

In one embodiment, the throttle handle 5 is provided with a first mounting hole 5-5 and a second mounting hole 5-6, one end of the first linkage shaft 5-3 and one end of the second linkage shaft 5-4 are respectively mounted in the first mounting hole 5-5 and the second mounting hole 5-6, and the other ends of the first linkage shaft and the second linkage shaft respectively protrude out of the surface of the throttle handle 5. Of course, in other embodiments, the first linkage shaft 5-3 and the second linkage shaft 5-4 can be connected to the throttle handle 5 by welding or the like.

In another embodiment, the first linkage shaft 5-3 and the second linkage shaft 5-4 are integrally formed with the throttle handle 5, respectively. It will be appreciated that the integral arrangement may facilitate the overall manufacture of the throttle grip 5. Preferably, the first linkage shaft 5-3 and the second linkage shaft 5-4 and the throttle handle 5 can be integrally processed by casting or stamping.

Further, as shown in FIG. 8, the choke handle 13 may be a split handle.

Specifically, the choke valve handle 13 comprises an operating handle 13a and a linkage handle (13b), a groove 13-3 is located on the linkage handle (13b), the operating handle 13a and the linkage handle (13b) are both fixed on the choke shaft 7, the operating handle 13a drives the choke shaft 7 to rotate, and the linkage handle 13b rotates along with the choke shaft 7 and is linked with the second linkage shaft 5-4.

The operation of the throttle and choke control linkage 20 is explained below

Referring to fig. 9a and 9b, a process diagram of the choke valve 9 from fully open to fully closed is shown.

When the choke valve 9 is in the full-open position, the fast idle handle 11 is tightly attached to the first linkage edge 11-1 and the third linkage surface 13-6 under the torsion action of the torsion spring 12. When the choke valve 9 is rotated from the fully open position to the fully closed position; that is, when the choke valve handle 13 is pulled counterclockwise, the choke valve handle 13 drives the fast idle handle 11 to rotate counterclockwise.

As described in fig. 10a to 10b, a process diagram of the throttle valve 3 from the idle position to the open position is shown.

When the third linkage edge 11-2 of the fast idle handle 11 rotates to be in contact with the first linkage shaft 5-3 on the throttle handle 5, the throttle handle 5 and the throttle 3 are driven to correspondingly move clockwise, and the throttle 3 gradually rotates from the idle speed to the opening position.

The maximum opening position state diagram of the throttle valve 3 in the linkage process as shown in fig. 11a to 11 b.

When the third linkage edge 11-2 of the fast idle handle 11 pushes the throttle handle 5 to rotate and the vertex 11-5 of the fast idle handle 11 rotates to be in contact with the first linkage shaft 5-3 of the throttle handle 5, the throttle 3 gradually rotates from the idle speed to the full-open direction, and at the moment, the vertex 11-5 of the fast idle handle 11 abuts against the first linkage shaft 5-3, and the opening degree of the throttle 3 is at the maximum position.

As shown in fig. 12a to 12c, when the choke valve handle 13 is pulled continuously, the fast idle handle 11 rotates counterclockwise continuously, the throttle handle 5 enters the first coupling surface 11-4 of the fast idle handle 11 through the first linkage shaft 5-3 under the torsion of the torsion spring 12, but does not contact with the clamping groove 11-3; at the same time, the second linkage shaft 5-4 on the throttle handle 5 rests on the first linkage face 13-4 of the choke handle 13, i.e., the first linkage face 13-4 of the choke handle 13 contacts the second linkage shaft 5-4.

As shown in fig. 13 a-13 b, as the choke handle 13 continues to rotate, the push fast idle handle 11 also continues to rotate until the choke valve 9 is fully closed. At the moment, the second linkage shaft 5-4 on the throttle handle 5 enters the groove 132 on the first linkage surface 13-4, and the first linkage shaft 5-3 is not in contact with the first linkage edge 11-4 and the linkage shaft 5-3 and the clamping groove 11-3, namely, a gap exists between the first linkage shaft 5-4 and the clamping groove.

As shown in FIG. 14, when the choke valve 9 is rotated clockwise by pushing the choke valve handle 13, at the same time, the third linkage surface 13-7 of the choke valve handle 13 pushes the throttle lever 5 to rotate clockwise; the fast idle handle 11 also rotates clockwise under the torsion of the torsion spring 12 until the first linkage edge 11-4 contacts and is clamped with the first linkage shaft 5-3 of the throttle handle 5. At which time fast idle handle 11 is no longer rotated clockwise.

As shown in fig. 15a to 15c, the choke handle 13 is further pushed to rotate clockwise, the third linkage surface 13-7 of the choke handle 13 is not in contact with the first linkage shaft 5-3, and at this time, the throttle handle 5 rotates counterclockwise under the torque of the torsion spring 12 until the first linkage shaft 5-3 is clamped in the clamping groove 11-3 of the fast idle handle 11. At this time, the throttle grip 5 stops rotating counterclockwise.

As shown in FIG. 16, continued clockwise rotation of the choke handle 13 causes the third linkage surface 13-7 of the choke handle 13 to disengage completely from the first linkage shaft 5-3 until the choke valve 9 is rotated clockwise to a fully open position, at which time the choke valve 9 contacts the stop 14-1 on the body 14. The first linkage shaft 5-3 of the throttle handle 5 is completely clamped in the clamping groove 11-3 of the fast idle handle 11, and at the moment, a gap is formed between the boss 11-6 and the boss 13-5, namely, a gap is formed between the second linkage surface 13-6 of the second linkage edge 11-1.

As shown in FIG. 17, when the throttle is operated to rotate from fast idle to full open position, i.e. the throttle grip 5 is pulled clockwise, the first linkage 5-3 of the throttle grip 5 is at the vertex 11-5 of the fast idle grip 11, and the throttle grip 5 is in critical state.

Finally, referring to fig. 18, the linkage mechanism of the present invention is shown in the end of motion state.

And (3) continuing operating the accelerator, continuing clockwise rotating the throttle valve handle 5, enabling the vertex 11-5 of the fast idle handle to be separated from the first linkage shaft 5-3 of the throttle valve handle, and enabling the fast idle handle 11 to rotate clockwise under the action of the torsion spring 12 until the second linkage edge 11-1 of the fast idle handle 11 is contacted with the second linkage surface 13-6 of the choke valve handle 13, namely, no gap exists between the boss 11-6 and the boss 13-6, and ending the movement of the linkage mechanism.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A throttle and choke control linkage mechanism of a diaphragm carburetor comprises a choke assembly (21) and a throttle assembly (22), wherein the choke assembly (21) can be linked with the throttle assembly (22);

the choke valve assembly (21) comprises a choke valve (9), a choke shaft (7), a choke valve handle (13), a fast idling handle (11) and a torsion spring (12), the choke valve (9) is installed at one end of the choke shaft (7), the choke valve handle (13) is installed at the other end of the choke shaft (7), and the fast idling handle (11) is installed on the choke shaft (7) and can rotate on the choke shaft (7);

the throttle valve assembly (22) comprises a throttle valve (3), a throttle shaft (1) and a throttle valve handle (5), the throttle valve (3) is installed at one end of the throttle shaft (1), the throttle valve handle (5) is installed at the other end of the throttle shaft (1) and is used for being linked with the throttle valve handle (13) and the fast idling handle (11), the torsional spring (12) is sleeved on the throttle shaft (7), one end of the torsional spring (12) is fixed on the fast idling handle (11), and the other end of the torsional spring is fixed on the throttle shaft (1) so as to provide acting force for resetting of the fast idling handle (11);

the quick idling air valve is characterized in that a plurality of linkage surfaces (131) capable of being in linkage with a throttle valve handle (5) are arranged on the choke valve handle (13), and the quick idling handle (11) comprises a clamping groove (11-3), a first peak (11-5) and a plurality of linkage edges (111); a first linkage shaft (5-3) is arranged on the throttle valve handle (5), and when the fast idling handle (11) rotates to the position where the first vertex (11-5) abuts against the outer surface of the first linkage shaft (5-3), the throttle valve handle (5) drives the throttle valve (3) to rotate to the maximum opening position in the linkage process; meanwhile, when the choke valve handle (13) is linked with the throttle valve handle (5), the choke valve (9) can be ensured to be opened by an angle under the condition of full closing, in the state, the throttle valve handle (5) and the clamping groove (11-3) are not in a linkage state, and a gap is formed between the first linkage shaft (5-3) and the fast idling handle (11).

2. The throttle and choke control linkage of a diaphragm carburetor according to claim 1, wherein the plurality of linkage surfaces (131) includes a first linkage surface (13-4), the plurality of linkage edges (111) includes a first linkage edge (11-4), the throttle lever (5) further includes a second linkage shaft (5-4), and the first linkage shaft (5-3) enters the first linkage edge (11-4) of the fast idle lever (11) and does not contact the notch (11-3) when the choke lever (13) is rotated to bring the first linkage surface (13-4) into contact with the outer surface of the second linkage shaft (5-4).

3. A diaphragm carburettor throttle and choke control linkage according to claim 2 wherein the first linkage surface (13-4) is recessed with a recess (13-3) and the choke valve (9) is fully closed and the throttle valve (3) is opened at an angle when the choke handle (13) is rotated until the second linkage shaft (5-4) is fully received in the recess (13-3).

4. A diaphragm carburettor throttle and choke control linkage according to claim 3 wherein the first linkage shaft (5-3) and the second linkage shaft (5-4) are spaced apart on the throttle handle (5).

5. A throttle and choke control linkage for a diaphragm carburetor according to claim 3, characterized in that the first linkage shaft (5-3) and the second linkage shaft (5-4) are both arranged vertically and the first linkage shaft (5-3) and the second linkage shaft (5-4) are parallel to each other.

6. The throttle and choke valve control linkage mechanism of the diaphragm carburetor according to claim 3, wherein the throttle lever (5) is provided with a first mounting hole (5-5) and a second mounting hole (5-6), one end of the first linkage shaft (5-3) and one end of the second linkage shaft (5-4) are respectively mounted in the first mounting hole (5-5) and the second mounting hole (5-6), and the other end of the first linkage shaft protrudes out of the surface of the throttle lever (5).

7. A diaphragm carburettor throttle and choke control linkage according to claim 3 characterised in that the first (5-3) and second (5-4) linkages are integral with the throttle handle (5) respectively.

8. A diaphragm carburettor throttle and choke control linkage according to claim 2 in which the choke lever (13) is a split lever.

9. A throttle and choke control linkage of a diaphragm carburettor according to claim 5 characterised in that the choke lever (13) includes an operating handle (13a) and a linkage handle (13b), the operating handle (13a) and the linkage handle (13b) being fixed to the choke shaft (7), the operating handle (13a) driving the choke shaft (7) to rotate, the linkage handle (13b) rotating with the choke shaft (7) and being linked to the second linkage shaft (5-4).

10. A diaphragm carburettor comprising a body and a throttle and choke control linkage mounted to the body (14), characterised in that the throttle and choke control linkage is as defined in any one of claims 1 to 9 inclusive.