Fuel supply system and high and low speed adjusting mechanism thereof

Abstract

The utility model relates to a fuel supply system and a high-low speed adjusting mechanism thereof, the fuel supply system comprises the high-low speed adjusting mechanism arranged on a body, and the high-low speed adjusting mechanism comprises an adjusting oil way, a fuel supply system and a fuel supply system, the adjusting screws comprise a high-speed adjusting screw and an idle-speed adjusting screw which correspond to the high-speed adjusting oil way and the idle-speed adjusting oil way respectively and are installed on the body; screw bodies of the high-speed adjusting screw and the idle-speed adjusting screw are respectively provided with a working part, a thread part and a tail part, and the working part of the high-speed adjusting screw is respectively provided with a high-speed oil way opening position and a blocking position relative to the high-speed adjusting oil way; the working part of the idle speed adjusting screw is respectively provided with an idle speed oil way opening position and a blocking position relative to the idle speed adjusting oil way; the sealing structures are arranged on the threaded parts of the high-speed adjusting screw and the idle-speed adjusting screw respectively, the threaded parts of the high-speed adjusting screw and the idle-speed adjusting screw are provided with sealing through holes perpendicular to the axes of the screws respectively, and the sealing structures are installed in the sealing through holes and matched with the high-speed adjusting screw and the idle-speed adjusting screw in a pre-tightening mode respectively.

Description

Technical Field

[0001] The utility model relates to a fuel supply system, in particular to a fuel supply system and its high and low speed adjusting mechanism. Background Art

[0002] In the prior art, the high and low speed adjusting structure of the carburetor cannot avoid the problem of flow rate change after the carburetor is debugged due to the thread fit clearance of the high and low speed adjusting screws, thus directly affecting the performance of the carburetor. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a fuel supply system and its high and low speed adjusting mechanism aiming at the above defects of the prior art.

[0004] To achieve the above object, the utility model provides a high and low speed adjusting mechanism, which is arranged on the body of the fuel supply system. Among them, it includes:

[0005] Adjusting oil circuits, including a high speed adjusting oil circuit and an idle speed adjusting oil circuit, which are respectively arranged on the body;

[0006] Adjusting screws, including a high speed adjusting screw and an idle speed adjusting screw. The high speed adjusting screw and the idle speed adjusting screw are respectively installed on the body corresponding to the high speed adjusting oil circuit and the idle speed adjusting oil circuit; working parts, thread parts and tails are respectively arranged on the screw bodies of the high speed adjusting screw and the idle speed adjusting screw. The working part of the high speed adjusting screw respectively has a high speed oil circuit opening position and a high speed oil circuit blocking position relative to the high speed adjusting oil circuit; the working part of the idle speed adjusting screw respectively has an idle speed oil circuit opening position and an idle speed oil circuit blocking position relative to the idle speed adjusting oil circuit; and

[0007] Sealing structures are respectively arranged on the thread parts of the high speed adjusting screw and the idle speed adjusting screw. Sealing through holes perpendicular to the screw axis are respectively arranged on the thread parts of the high speed adjusting screw and the idle speed adjusting screw. The sealing structures are installed in the sealing through holes and are respectively pre-tightened and matched with the corresponding high speed adjusting screw and idle speed adjusting screw.

[0008] In the above high and low speed adjusting mechanism, the sealing structure is a lockpin. The pin body of the lockpin includes a press-in end, a guiding part and a matching part. The press-in end is located at the top of the guiding part, and the tail end of the guiding part is smoothly connected with the matching part.

[0009] In the above high and low speed adjusting mechanism, the guiding part is a cone, the matching part is a cylinder, and the diameter of the tail end of the guiding part is equal to the diameter of the matching part.

[0010] In the above-mentioned high and low speed adjustment mechanism, the outer surface of the introduction portion has an inclination angle relative to the outer surface of the matching portion.

[0011] The above-mentioned high and low speed adjustment mechanism, wherein the inclination angle is 11°.

[0012] In the above-mentioned high and low speed adjustment mechanism, the anti-loosening pin is made of low-density polyethylene material or nylon material.

[0013] The above-mentioned high and low speed adjustment mechanism, wherein the threaded parts of the high-speed adjustment screw and the idle speed adjustment screw are respectively provided with two mutually parallel sealing through holes, and the center distance between the two sealing through holes is adapted to the length of the threaded parts of the high-speed adjustment screw and the idle speed adjustment screw.

[0014] In the above-mentioned high and low speed adjustment mechanism, the high speed adjustment screw and the idle speed adjustment screw are respectively made of metal materials.

[0015] In the above-mentioned high and low speed adjustment mechanism, the high speed adjustment screw and the idle speed adjustment screw are respectively made of copper material or iron material.

[0016] In order to better achieve the above-mentioned purpose, the present invention also provides a fuel supply system, which includes the above-mentioned high and low speed adjustment mechanism.

[0017] The beneficial effects of the present invention are:

[0018] The fuel supply system of the utility model has a high and low speed adjustment mechanism, in which anti-loosening pins are arranged at the threads of the high-speed adjustment screw and the idle speed adjustment screw, thereby avoiding the carburetor flow debugging problem caused by the clearance between the threads of the high and low speed adjustment screws, improving the flow accuracy of the fuel supply system, and enhancing the overall performance of the fuel supply system.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a fuel supply system according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a high and low speed adjustment mechanism according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of an adjusting screw according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the anti-loosening pin structure of an embodiment of the present utility model.

[0024] Among them, the reference signs

[0025] 1 Body

[0026] 2 Upper cover

[0027] 3 Metering chamber diaphragm

[0028] 4 Metering chamber cover

[0029] 5 High and low speed adjustment mechanism

[0030] 51 High speed adjustment screw

[0031] 511 Sealing through hole

[0032] 512 Working part

[0033] 513 Threaded part

[0034] 514 Tail part

[0035] 52 Idle speed adjustment screw

[0036] 53 High speed adjustment oil circuit

[0037] 54 Idle speed adjustment oil circuit

[0038] 55 Anti-loosening pin

[0039] 551 Pressing end

[0040] 552 Introduction part

[0041] 553 Fitting part Detailed implementation manners

[0042] The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings:

[0043] See Figure 1 , Figure 1 which is a schematic structural diagram of the fuel supply system according to an embodiment of the present utility model. The fuel supply system of the present utility model includes a body 1, an upper cover 2, a metering chamber diaphragm 3, a metering chamber cover 4, and a high and low speed adjustment mechanism 5. The composition, structure, mutual positional relationship, connection relationship, and functions of other parts of the fuel supply system are all relatively mature prior arts, so they will not be described in detail here. Only the high and low speed adjustment mechanism 5 of the present utility model will be described in detail below.

[0044] See Figure 2 , Figure 2Cross-sectional view of the high and low speed adjustment mechanism 5 according to an embodiment of the present invention. The high and low speed adjustment mechanism 5 of the present invention is provided on the body 1 of the fuel supply system, and includes: an adjustment oil circuit, including a high speed adjustment oil circuit 53 and an idle speed adjustment oil circuit 54, which are respectively provided on the body 1; adjustment screws, including a high speed adjustment screw 51 and an idle speed adjustment screw 52, and the high speed adjustment screw 51 and the idle speed adjustment screw 52 are respectively installed on the body 1 corresponding to the high speed adjustment oil circuit 53 and the idle speed adjustment oil circuit 54; working parts 512, threaded parts 513 and tails 514 are respectively provided on the screw bodies of the high speed adjustment screw 51 and the idle speed adjustment screw 52, and the working part 512 of the high speed adjustment screw 51 has a high speed oil circuit opening position and a high speed oil circuit blocking position relative to the high speed adjustment oil circuit 53 respectively; the working part of the idle speed adjustment screw 52 has an idle speed oil circuit opening position and an idle speed oil circuit blocking position relative to the idle speed adjustment oil circuit 54 respectively; and a sealing structure, which is respectively provided on the threaded parts 513 of the high speed adjustment screw 51 and the idle speed adjustment screw 52, and sealing through holes 511 perpendicular to the screw axis are respectively provided on the threaded parts 513 of the high speed adjustment screw 51 and the idle speed adjustment screw 52, and the sealing structure is installed in the sealing through holes 511 and is pre-tightened and matched with the corresponding high speed adjustment screw 51 and idle speed adjustment screw 52 respectively.

[0045] See Figure 3 , Figure 3 Schematic structural diagram of the high speed adjustment screw 51 according to an embodiment of the present invention. The high speed adjustment screw 51 and the idle speed adjustment screw 52 have the same structure. Two sealing through holes 511 perpendicular to the screw axis are respectively provided on the threaded parts 513 of the high speed adjustment screw 51 and the idle speed adjustment screw 52 in this embodiment, and the center distance between the two sealing through holes 511 is adapted to the length of the threaded parts 513 of the high speed adjustment screw 51 and the idle speed adjustment screw 52, and can be adjusted according to the depth of the threaded hole. The high speed adjustment screw 51 and the idle speed adjustment screw 52 are respectively metal material parts, preferably copper material parts or iron material parts.

[0046] See Figure 4 , Figure 4Schematic diagram of the structure of the anti-loosening pin 55 according to an embodiment of the present utility model. The sealing structure in this embodiment is preferably the anti-loosening pin 55. The pin body of the anti-loosening pin 55 includes a press-in end 551, a guiding portion 552, and a mating portion 553. The press-in end 551 is located at the top of the guiding portion 552, and the tail end of the guiding portion 552 is connected to the mating portion 553. The guiding portion 552 is a cone, the mating portion 553 is a cylinder, and the diameter of the tail end of the guiding portion 552 is equal to the diameter of the mating portion 553. Among them, the outer surface of the guiding portion 552 has an inclination angle relative to the outer surface of the mating portion 553, and the angle of the inclination angle is preferably 11°; the anti-loosening pin 55 is preferably a low-density polyethylene material part or a nylon material part.

[0047] The high-low speed adjustment mechanism 5 of the prior art is pre-tightened by means of threads and springs, and it is easy to cause screw loosening due to the problem of the size of the thread clearance, resulting in a change in flow rate. The high-low speed adjustment mechanism 5 of the present utility model is pre-tightened and matched with the anti-loosening pin 55 through threads, which can effectively avoid the problem of loosening of the thread fit, improve the flow accuracy of the fuel supply system, and enhance the overall performance of the fuel supply system.

[0048] Certainly, the present utility model may also have many other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A high and low speed adjustment mechanism is provided on the body of the fuel supply system, characterized in that, Comprising: A regulating oil circuit, including a high-speed regulating oil circuit and an idle-speed regulating oil circuit, which are respectively arranged on the body; Regulating screws, including a high-speed regulating screw and an idle-speed regulating screw, the high-speed regulating screw and the idle-speed regulating screw are respectively installed on the body corresponding to the high-speed regulating oil circuit and the idle-speed regulating oil circuit; working parts, threaded parts and tails are respectively arranged on the screw bodies of the high-speed regulating screw and the idle-speed regulating screw, and the working part of the high-speed regulating screw respectively has a high-speed oil circuit opening position and a high-speed oil circuit blocking position relative to the high-speed regulating oil circuit; the working part of the idle-speed regulating screw respectively has an idle-speed oil circuit opening position and an idle-speed oil circuit blocking position relative to the idle-speed regulating oil circuit; And Sealing structures, which are respectively arranged on the threaded parts of the high-speed regulating screw and the idle-speed regulating screw, the threaded parts of the high-speed regulating screw and the idle-speed regulating screw are respectively provided with sealing through holes perpendicular to the screw axis, and the sealing structures are installed in the sealing through holes and are respectively pre-tightened and matched with the corresponding high-speed regulating screw and idle-speed regulating screw.

2. The high-low speed adjustment mechanism according to claim 1, characterized in that, The sealing structure is a lock pin, and the pin body of the lock pin includes a pressing end, a guiding part and a matching part. The pressing end is located at the top of the guiding part, and the tail end of the guiding part is smoothly connected with the matching part.

3. The high-low speed adjustment mechanism according to claim 2, wherein, The guiding part is a cone, the matching part is a cylinder, and the diameter of the tail end of the guiding part is equal to the diameter of the matching part.

4. The high-low speed adjustment mechanism according to claim 2, characterized in that, The outer surface of the guiding part has an inclination angle relative to the outer surface of the matching part.

5. The high-low speed adjustment mechanism according to claim 4, characterized in that, The angle of the inclination angle is 11°.

6. The high-low speed adjustment mechanism according to claim 2, characterized in that, The lock pin is a low-density polyethylene material part or a nylon material part.

7. The high-low speed adjustment mechanism according to claim 1, wherein Two mutually parallel sealing through holes are respectively arranged on the threaded parts of the high-speed regulating screw and the idle-speed regulating screw, and the center distance between the two sealing through holes is adapted to the length of the threaded parts of the high-speed regulating screw and the idle-speed regulating screw.

8. The high-low speed adjustment mechanism according to claim 1, wherein The high-speed regulating screw and the idle-speed regulating screw are respectively metal material parts.

9. The high-low speed adjustment mechanism according to claim 8, characterized in that, The high-speed regulating screw and the idle-speed regulating screw are respectively copper material parts or iron material parts.

10. A fuel supply system, characterized in that, Comprising the high-low speed regulating mechanism according to any one of claims 1-9.

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