WO2012009944A1

WO2012009944A1 - Carburetor and choke valve control mechanism thereof

Info

Publication number: WO2012009944A1
Application number: PCT/CN2011/000011
Authority: WO
Inventors: 陈俭敏; 徐小平; 徐炎
Original assignee: Chen Jianmin; Xu Xiaoping; Xu Yan
Priority date: 2010-07-23
Filing date: 2011-01-12
Publication date: 2012-01-26
Also published as: CN101922381B; CN101922381A

Abstract

A carburetor and a choke valve control mechanism thereof are provided. The carburetor includes a carburetor main body (1) and a throttle valve (2) mounted thereon, a throttle valve rocker-arm (3) connected to the throttle valve (2), a choke valve (4), a choke valve shaft (5) and a choke valve control mechanism (6) both connected to the choke valve(4). The choke valve control mechanism (6) includes a choke valve rocker-arm (61), a sliding connecting-rod (62), a release spring (64) and a metal temperature-controlling device (65) for controlling the position of the choke valve rocker-arm (61). The sliding connecting-rod (62) is connected to the throttle valve rocker-arm (3) and the choke valve shaft (5) of the carburetor, the release spring (64) is provided on the choke valve shaft (5) and is connected to the carburetor main body (1), the choke valve rocker-arm (61) is rotatablely connected to the choke valve shaft (5), and on the choke valve rocker-arm (61) is provided a rocker-arm working surface for driving the choke valve shaft (5) to rotate. The metal temperature-controlling device (65) is connected to the choke valve rocker-arm (61) and is provided on a heat radiating component of an engine. The carburetor is convenient in use, simple in structure, and runs steady and reliably.

Description

Carburetor and its choke control mechanism

The invention relates to a carburetor for an engine, in particular to a carburetor and a fully automatic choke thereof. Background technique

With the improvement of science and technology, people have higher and higher requirements for automatic product control. Generally, when starting the engine, the carburetor choke must be manually closed. After starting, the choke should be manually opened. The choke is manually controlled, which is extremely inconvenient. Referring to Fig. 1, Fig. 1 is a schematic view showing the structure of a carburetor and a choke valve of the prior art. As shown in the figure, a conventional carburetor is shown. When the engine is started, the choke valve 100 is fully closed, and needs to be manually rotated after starting. The shift fork 200 drives the choke shaft 300 to rotate and open the choke valve 100. When the engine is stopped, the next time the cold machine is started, the choke valve 100 needs to be manually closed, and then turned on after being turned on.

The carburetor disclosed in the Chinese utility model patent entitled "ZL200820078655. 0", the name "a carburetor" can improve the reliability of the engine start, avoid the difficulty of starting and the idling stop after the choke is opened, but The choke valve of the carburetor needs manual control, which affects the convenience of operation to a certain extent. Patent No. "ZL200510055078. 4", the Chinese invention patent entitled "Automatic choke device", the disclosed automatic choke device can perform precise choke control in accordance with the operating state of the engine, but its structure is complicated. , higher cost. Invention disclosure

The technical problem to be solved by the present invention is to provide a carburetor and a choke valve which are simple in structure, safe and convenient to use, and whose choke can realize automatic control.

In order to achieve the above object, the present invention provides a choke control mechanism disposed on a carburetor of an engine, wherein the choke control mechanism includes a choke rocker arm, a sliding link, a return spring, and is used for control a metal temperature control device for the position of the choke arm, the sliding link connecting the throttle arm of the carburetor and the choke shaft of the carburetor, the return spring being disposed at the resistor a damper shaft is coupled to the carburetor body of the carburetor, the choke rocker arm is rotatably coupled to the choke shaft, and the choke rocker arm is provided with a member for driving the choke shaft to rotate a rocker working surface, the metal temperature control device is coupled to the choke rocker arm, and the metal temperature control device is disposed at the engine On the heating parts.

The above-mentioned choke control mechanism, wherein the metal temperature control device comprises a bimetal thermostat and a thermostat connecting rod, one end of the thermostat connecting rod is connected with the bimetal thermostat, The choke rocker arm is rotatably coupled to the other end of the thermostat link.

The above-described choke control mechanism, wherein the bimetal thermostat is disposed on a muffler or cylinder of the engine.

The above-mentioned choke control mechanism, wherein the choke rocker arm includes a first plane, a second plane, and a third plane that are sequentially connected, and the first plane is provided with a first for connecting with the choke shaft a connecting hole, the third plane is provided with a second connecting hole for connecting with the thermostat link, and the second plane is the rocker working surface.

The above-mentioned choke control mechanism, wherein the first plane is disposed in parallel with the third plane, and the second plane is disposed perpendicular to the first plane and the second plane, the first plane and the A first transitional arc surface is disposed between the second planes, and a second transition arc surface is disposed between the second plane and the third plane.

The above-mentioned choke control mechanism further includes a bushing for defining a choke rocker arm and a returning torsion spring, the bushing is sleeved on the choke shaft, the returning torsion spring and the choke valve The rocker arm is sleeved on the sleeve, and the choke rocker arm is located above the return torsion spring.

The above-mentioned choke control mechanism, wherein the sliding link includes a first end, a second end, and a sliding slot, and the first end is provided with a sliding connecting hole for connecting with the throttle rocker arm, the sliding The groove is disposed along a length direction of the sliding link, and the sliding groove is adjacent to the second end.

In the above-described choke control mechanism, the sliding link is a linear structure, an arc structure or a bent structure.

The above-mentioned choke control mechanism, wherein the thermostat link and the choke rocker arm are connected by a rocker arm connecting member, the rocker arm connecting member includes a connecting rod connecting portion, a rocker arm connecting portion, and a connection a connecting surface of the connecting rod connecting portion and the rocker connecting portion, the connecting rod connecting portion is provided with a connecting groove adapted to the thermostat connecting rod, and the rocking arm connecting portion is provided with the The connecting hole of the thermostat connecting rod.

In order to better achieve the above object, the present invention also provides a carburetor including a carburetor body and a throttle valve mounted on the carburetor body, a throttle rocker arm connected to the throttle valve, a choke valve, a choke shaft connected to the choke valve, and a choke control mechanism, wherein the choke control mechanism is the choke control mechanism described above. The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but not to limit the invention. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic view showing the structure of a carburetor and a choke valve of the prior art;

2A is a schematic perspective view showing a carburetor and a choke control mechanism thereof according to the present invention;

2B is a schematic perspective view of the other direction of FIG. 2A;

3A is a schematic view showing a throttle state of the carburetor of the present invention when the engine is cold;

3B is a schematic view showing the state of the choke valve of the carburetor of the present invention when the engine is cold;

Figure 3C is a plan view of Figure 3B;

4A is a schematic view showing the state of the choke valve of the carburetor of the present invention when the cold machine is started;

Figure 4B is a plan view of Figure 4A;

Figure 5A is a plan view of the carburetor of the present invention in an idling condition;

Figure 5B is a plan view of the carburetor of the present invention in a fully open position;

6A is a schematic view showing the connection between the choke arm and the metal temperature control device according to an embodiment of the present invention; FIG. 6B is a schematic view showing the working principle of the metal temperature control device when the engine is cold;

6C is a schematic view showing the working principle of the metal temperature control device when the engine is hot;

7A is a schematic view showing the assembly relationship between the choke arm and the choke shaft of the present invention;

Figure 7B is a plan view of Figure 7A;

8A is a schematic structural view of a sliding link according to an embodiment of the present invention;

8B is a schematic structural view of a sliding link according to another embodiment of the present invention;

8C is a schematic structural view of a sliding link according to still another embodiment of the present invention;

9 is a schematic structural view of a choke rocker arm according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of a returning torsion spring according to an embodiment of the present invention; FIG.

FIG. 11 is a schematic structural view of a rocker connector according to an embodiment of the present invention.

Wherein, the reference numeral

current technology

100 choke

200 fork

300 choke shaft this invention

1 carburetor body

2 throttle

21 throttle reversal 3 throttle rocker

4 choke

41 choke reversal 5 choke shaft

51 choke shaft side 6 choke control mechanism

61 choke rocker

611 first plane 612 second plane 613 third plane 614 first connection hole 615 second connection hole 616 first transitional arc surface 617 second transitional arc surface 62 sliding link

621 First end 622 Second end 623 Sliding connection hole 624 Sliding groove 64 Return torsion spring

641 spring body 642 first spring end 643 second spring end 65 metal temperature control device 51 bimetal thermostat

652 thermostat connecting rod 67 rocker connector

671 connecting rod connection

672 rocker connection

673 connection surface

674 connection slot

675 connection hole

68 bushing

7 engine The best way to achieve the invention

The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings - see Fig. 1, Fig. 2A and Fig. 2B, Fig. 1 is a schematic view of the prior art carburetor and its choke structure, Fig. 2A is a schematic view of the present invention FIG. 2B is a schematic perspective view showing the three-dimensional structure of the carburetor and its choke control mechanism. FIG. The carburetor of the present invention includes a carburetor body 1 and a throttle valve 2 mounted on the carburetor body 1, a throttle rocker arm 3 connected to the throttle valve 2, a choke valve 4, and the The choke shaft 5 and the choke control mechanism 6 connected to the choke valve 4 are all mature prior art, and will not be described herein. Only the choke control mechanism 6 will be described in detail below.

Referring to FIG. 2B, the choke control mechanism 6 of the present invention is disposed on the carburetor of the engine 7, and the choke control mechanism 6 includes a choke rocker arm 61, a sliding link 62, a return torsion spring 64, and a metal temperature control device 65 for controlling the position of the choke rocker arm 61, the metal temperature control device 65 is connected to the choke rocker arm 61, and the metal temperature control device 65 is disposed on the heat generating component of the engine 7. . The heat generating component of the engine according to the present invention refers to a place where the temperature of the engine changes with the engine heat engine. In the present embodiment, the metal temperature control device 65 is preferably disposed on the muffler or the cylinder of the engine 7. The metal temperature control device 65 in this embodiment is preferably a bimetal temperature controller 651 and a thermostat link 652. Of course, other temperature control devices that can change the positional relationship according to temperature changes can be selected as long as the resistance can be achieved. The control of the damper rocker arm 61 can realize the automatic control of the choke valve 4, which is not limited thereto. The sliding link 62 is connected to the throttle rocker arm 3 of the carburetor and the choke shaft 5 of the carburetor, and the return torsion spring 64 is disposed on the choke shaft 5 and The body 1 of the carburetor is connected, and the choke arm 61 is rotatably connected to the choke shaft 5, and the choke arm 61 is provided with a rocker working surface for pushing the choke shaft 5 to rotate. One end of the thermostat link 652 and the bimetal thermostat Connected to 651, the choke rocker arm 61 is rotatably coupled to the other end of the thermostat link 652, and the bimetal thermostat 651 is disposed on the engine.

The choke control mechanism 6 of the present invention is applicable to an engine in which the throttle valve 2 is fully open in a cold state, and its working principle is shown in FIG. 3A to FIG. 3C. FIG. 3A is a schematic diagram of a throttle state of the carburetor in an engine cold state according to the present invention. 3B is a schematic view showing the state of the choke valve of the carburetor of the present invention when the engine is cold, and FIG. 3C is a plan view of FIG. 3B. When the engine is in the cold state, as shown in the figure, the throttle 2 is in the fully open position, and the choke 4 is in the fully closed position by the return torsion spring 64. The working process that the choke valve 4 needs to achieve is as follows: a. When the refrigerator is cold, the choke valve 4 is fully closed;

b. When cold start, the choke valve 4 is half open to avoid the choke valve 4 opening too early or too late to cause flameout; c. After the heat engine, the choke valve 4 is fully open, and the throttle valve 2 can be turned to any working condition;

d. When the hot start is started, the choke valve 4 is kept fully open;

e. After the shutdown, the choke valve 4 returns to the fully closed position, ready for the next start.

Referring to Figures 4A and 4B, Figure 4A is a schematic view showing the state of the choke valve of the carburetor of the present invention when the cold machine is started, and Figure 4B is a plan view of Figure 4A. As shown in the figure, when the engine starts the engine, the throttle 2 is rotated to the no-load position, and the choke 4 is driven to rotate to the half-open position by the sliding link 62. This will not cause the engine to stall if the bellows 4 is opened too early or too late at startup, or the mixture is too late to open the choke 4, causing the mixture to become too thick and polluting the environment, thus having good starting performance and environmental protection requirements.

Engine heat engine process: As the engine is running, the bimetal thermostat 651 mounted on the muffler or cylinder of the engine 7 will bend and rotate as the temperature rises, thereby driving through the thermostat link 652. The connected choke rocker arm 61 rotates. As shown in Fig. 2B, the rocker arm working surface (i.e., the second plane 612) is turned to the illustrated position to be in contact with the choke shaft side 51, and is rotated by the choke shaft 5 until the choke valve 4 is fully opened.

Normal engine operation: After the engine heat engine, the choke valve 4 is controlled by the bimetal thermostat 651 and will remain fully open. The throttle 2 can be turned to any working position at this time, and the throttle pin 21 on the throttle 2 can slide in the sliding groove 624 of the sliding link 62, temporarily losing connection with the choke 4, and satisfying various working conditions of the engine. The requirements for running below. 5A, FIG. 5B are two extreme positions of the engine working, FIG. 5A is a plan view of the carburetor in the idling condition position of the present invention, and FIG. 5B is a position of the carburetor in the fully open working position of the present invention. Top view.

The heat engine starts: When the engine is stopped in the heat engine, the throttle valve 2 will return to the initial full open position, and the choke valve 4 is in the fully open position due to the action of the bimetal thermostat 651, and the start is started again. The machine just meets the requirement that the heat engine start the choke 4 fully open.

Engine stop: After the engine is stopped, the throttle 2 will automatically return to the initial fully open position. As the engine temperature drops, the bimetal of the bimetal thermostat 651 will slowly return to the original state and the bending and swirling motion will occur. The thermostat link 652 drives the choke rocker arm 61 to rotate in the opposite direction and slowly returns. Cold machine location. At the same time, as the working face of the choke rocker arm 61 is disengaged from the choke shaft side 51, the choke valve 4 returns to the fully closed position of the cold state under the action of the return torsion spring 64. During this process, the sliding link 62 will slide with it, but the throttle 3 will not be controlled.

Referring to FIG. 2B and FIG. 6A to FIG. 6C, FIG. 6A is a schematic diagram showing the connection between the choke arm and the metal temperature control device according to an embodiment of the present invention, and FIG. 6B is a schematic diagram of the working principle of the metal temperature control device when the engine is cold, FIG. 6C is Schematic diagram of the working principle of the metal temperature control device when the engine is hot. 6B and 6C show the two extreme positions of the choke control mechanism 6 of the present invention, respectively. The bimetal thermostat 651 of the present invention on the muffler or cylinder of the engine 7 of the engine is rotatably coupled to the choke rocker arm 61 via the thermostat link 652. The shape of the thermostat link 652 can be designed according to different engine and carburetor configurations, and there is no limitation thereto. 6A and 6B show the state of the cold machine. When the temperature rises, the bimetal thermostat 651 will bend and rotate, thereby pulling the thermostat link 652 and driving the choke rocker 61 connected thereto. Rotating, reaching the position shown in Fig. 6C; when the temperature is lowered, the bimetal thermostat 651 will reversely rotate, causing the thermostat link 652 and the choke rocker arm 61 to return to the cold position shown in Fig. 6B.

Referring to Figures 7A and 7B, Figure 7A is a schematic view showing the assembly relationship between the choke arm and the choke shaft of the present invention, and Figure 7B is a plan view of Figure 7A. The choke control mechanism 6 further includes a sleeve 68 for defining the choke rocker arm 61 and the return torsion spring 64, the bushing 68 is sleeved on the choke shaft 5, the return torsion spring 64 and the The choke rocker arm 61 is sleeved on the sleeve 68, and the choke rocker arm 61 is located above the return torsion spring 64.

8A to 8C, FIG. 8A is a schematic structural view of a sliding link according to an embodiment of the present invention, FIG. 8B is a schematic structural view of a sliding link according to another embodiment of the present invention, and FIG. 8C is a sliding connection according to still another embodiment of the present invention. Schematic diagram of the rod structure. The sliding link 62 includes a first end 621, a second end 622, and a sliding slot 624. The first end 621 is provided with a sliding connecting hole 623 for connecting with the throttle rocker arm 3. The sliding slot 624 The sliding groove 624 is disposed along the longitudinal direction of the sliding link 62, and the sliding groove 624 is adjacent to the second end 621. The shape of the sliding link 62 is not particularly limited as long as the linkage function of the throttle valve 2 and the choke valve 4 can be realized. For example, the sliding link 62 can be a linear connecting rod, that is, the sliding joint The rod 62 is an axisymmetric structure, and the axis of symmetry of the sliding link 62 is a straight line (as shown in FIG. 8C); The sliding link 62 may be an arc structure (as shown in FIG. 8A) or a bent structure (as shown in FIG. 8B). Referring to FIG. 9, FIG. 9 is a schematic structural view of a choke rocker arm according to an embodiment of the present invention. The choke rocker arm 61 includes a first plane 611, a second plane 612 and a third plane 613 which are sequentially connected, and the first plane 611 is provided with a first connecting hole 614 for connecting with the choke shaft 5 The third plane 613 is provided with a second connecting hole 615 for connecting with the thermostat link 652, and the second plane 612 is the rocker working surface. In this embodiment, the first plane 611 is disposed in parallel with the third plane 613, and the second plane 612 is disposed perpendicular to the first plane 611 and the second plane 612, and the first plane 611 A first transition arc surface 616 is disposed between the second plane 612 and a second transition arc surface 617 between the second plane 612 and the third plane 613.

Referring to FIG. 10, FIG. 10 is a schematic diagram of a returning twist structure according to an embodiment of the present invention. The return torsion spring 64 includes a spring body 641 and a first end 642 for connection to the choke shaft, i.e., a second end 643 for connection to the carburetor body 1. The torsion force of the return torsion spring 64 should meet the set requirement, that is, the torsion force can push the choke shaft 5 to rotate under the driving of the choke rocker arm 61 by the thermostat link 652, and can also be rotated at the end of the driving force. A smooth reset of the choke shaft 5 is achieved.

Referring to Figures 11, Figure 11 is a schematic view showing the structure of a rocker connector according to an embodiment of the present invention. The thermostat link 652 and the choke rocker arm 61 are connected by a rocker arm connecting member 67. The rocker arm connecting member 67 includes a connecting rod connecting portion 671, a rocker connecting portion 672, and a connecting body a connecting portion 673 of the lever connecting portion 671 and the rocker connecting portion 672, the connecting rod connecting portion 671 is provided with a connecting groove 674 adapted to the thermostat link 652, and the rocker connecting portion 672 is disposed There is a connection hole 675 that is adapted to the thermostat link 652. In this embodiment, the axis of the connecting groove 674 is perpendicular to the axis of the connecting hole 675.

The invention realizes the automatic control of the choke by means of the mechanical structure, adds a sliding link between the throttle valve and the choke valve, adds a return torsion spring and a choke rocker arm at the choke valve, and adds a metal temperature control on the engine. The device realizes the automatic switch of the choke, which fully meets the needs of the engine work, and has the advantages of convenient use, simple structure, stability and reliability.

There are a variety of other embodiments of the present invention, and various modifications and changes can be made thereto in accordance with the present invention without departing from the spirit and scope of the invention. Changes and modifications are intended to be included within the scope of the appended claims. Industrial applicability

The invention adds a sliding link between the throttle valve and the choke valve, and adds a return torsion spring at the choke valve And the rocker arm, in addition to the engine to add a metal temperature control device, together to achieve the automatic switch of the choke, fully meet the needs of the engine work, and meet environmental requirements. The invention has the advantages of convenient use, simple structure, stability and reliability, and is more environmentally friendly than the conventional carburetor. The invention avoids the conventional carburetor after the engine is started, because the user opens the choke valve too late and the mixture is too rich. It produces thick smoke and pollutes the environment, and has high practical economic value.

Claims

Claim

A choke control mechanism, disposed on an carburetor of an engine, wherein the choke control mechanism includes a choke rocker arm, a sliding link, a return spring, and a control for the choke flap a metal temperature control device at an arm position, the sliding link connecting a throttle rocker arm of the carburetor and a choke shaft of the carburetor, the return spring being disposed on the choke shaft and The carburetor body of the carburetor is connected, the choke rocker arm is rotatably coupled to the choke shaft, and the choke arm is provided with a rocker working surface for pushing the choke shaft to rotate The metal temperature control device is coupled to the choke rocker arm, and the metal temperature control device is disposed on a heat generating component of the engine.

2. The choke control mechanism according to claim 1, wherein the metal temperature control device comprises a bimetal thermostat and a thermostat link, one end of the thermostat link and the A bimetal thermostat is coupled, and the choke rocker arm is rotatably coupled to the other end of the thermostat link.

The choke control mechanism according to claim 2, wherein the bimetal temperature controller is disposed on a muffler or a cylinder of the engine.

The choke control mechanism according to claim 2, wherein the choke rocker arm includes a first plane, a second plane, and a third plane that are sequentially connected, and the first plane is provided with The first connecting hole of the choke shaft is connected, and the third plane is provided with a second connecting hole for connecting with the thermostat link, and the second plane is the rocker working surface.

The choke control mechanism according to claim 4, wherein the first plane is disposed in parallel with the third plane, and the second plane is perpendicular to the first plane and the second plane The first transitional arc surface is disposed between the first plane and the second plane, and the second transitional arc surface is disposed between the second plane and the third plane.

6. The choke control mechanism of claim 2, further comprising a bushing for defining a choke rocker arm and a return torsion spring, the bushing being sleeved on the choke shaft, The return torsion spring and the choke rocker arm are sleeved on the sleeve, and the choke rocker arm is located above the return torsion spring.

7. The choke control mechanism of claim 2, wherein the sliding link includes a first end, a second end, and a sliding slot, the first end being provided with a throttle arm for the throttle A sliding contact hole is provided, the sliding groove is disposed along a length direction of the sliding link, and the sliding groove is adjacent to the second end.

8. The choke control mechanism according to claim 7, wherein the sliding link is a linear structure, an arc structure, or a bent structure.

9. The choke control mechanism according to claim 2, wherein the thermostat link and the choke rocker arm are connected by a rocker arm connecting member, and the rocker arm connecting member includes a connecting rod connecting portion a rocker arm connecting portion and a connecting surface for connecting the connecting rod connecting portion and the rocker arm connecting portion, wherein the connecting rod connecting portion is provided with a connecting groove adapted to the thermostat connecting rod, The rocker arm connection portion is provided with a connection hole adapted to the thermostat link.

10. A carburetor comprising a carburetor body and a throttle valve mounted on the carburetor body, a throttle rocker arm connected to the throttle valve, a choke valve, and a resistance connected to the choke valve The damper shaft and the choke control mechanism are characterized in that the choke control mechanism is the choke control mechanism according to any one of claims 1 to 9.