Inline two-cylinder two-stroke engine intake system and engine

Abstract

The present invention discloses an intake system for an in-line twin-cylinder two-stroke engine, comprising an intake pipe assembly mounted on the engine and an injector bracket assembly mounted in cooperation with the intake pipe assembly; the intake pipe assembly comprises an intake pipe body, an upper end of the intake pipe body being formed with an intake pipe oblique opening for fittingly mounting with the injector bracket assembly; the intake system of the present invention adopts a design method of controlling dual valve plates with a single servo, thereby simplifying the valve plate control structure of the dual-cylinder engine, reducing the weight of the overall structure, and improving the intake uniformity of the dual cylinders at small openings; the intake pipe body opening is connected and mounted with the bracket assembly in an inclined manner, thereby ensuring the stability and sealing of the product installation, and facilitating the overall disassembly of the bracket for maintenance of the intake system, thereby improving the convenience of maintenance.

Description

Technical Field

[0001] The present invention relates to the field of two-stroke engines, and in particular to an in-line twin-cylinder two-stroke engine intake system and an engine. Background Art

[0002] Unlike a four-stroke engine, a two-stroke engine uses the vacuum created in the crankcase during the upward movement of the piston to send fresh air into the crankcase. At the same time, fuel injection is completed within an appropriate time to promote the formation of a mixture. The intake system of the crankcase is closed through a reed valve, and the crankcase pressure is increased during the downward movement of the piston, and the fuel mixture in the crankcase is sent into the cylinder through the scavenging effect.

[0003] The traditional inline two-cylinder two-stroke engine uses an inverted Y-shaped intake manifold to control the intake of the two cylinders, which can only control the flow of the manifold. However, due to the characteristics of the two-stroke engine intake, the two cylinders are intermittently inhaled (with a phase difference of 180CA), which causes intake pulsation in the branch pipe, affecting the intake uniformity of the two cylinders. At the same time, because the flow control position is on the manifold, the engine stability is very poor at a small opening.

[0004] Newer technology uses two independent intake valve bodies, driven by two servos. This results in inconsistent opening and flow rates, requiring two complete sets of position sensors to provide feedback on the valve openings of the two valve bodies and two complete sets of servos to control the valve openings. Due to production tolerances, it is difficult to calibrate the flow rates of the two valve bodies to a high degree of accuracy. In particular, uneven flow rates at small engine openings can lead to unstable idle conditions, significant differences in combustion between the two cylinders, and even single-cylinder combustion. At the same time, in aviation applications, the dual system increases the system complexity and the weight of related components (such as the ECU drive interface, wiring harness, etc.). During the service of the aircraft engine, the installation space and the sealing effect between components need to be considered. The injector generally needs to be replaced regularly. During the replacement of the injector, the injector mounting plate and injector plug need to be removed. When replacing the injector in the traditional intake system, the operation needs to be performed on the entire engine. Due to limited maintenance space and a large number of pipes and wiring harnesses (oil inlet pipe X2, oil return pipe X2, servo control X2, TPSX2, T-MAPX2, injector X2), the operation difficulty and replacement time are greatly increased.

[0005] Therefore, in order to solve the above problems, an in-line twin-cylinder two-stroke engine intake system is needed to solve the above problems. Summary of the Invention

[0006] In view of this, the in-line twin-cylinder two-stroke engine intake system of the present invention adopts a design method of controlling dual valve plates with a single servo, which simplifies the butterfly valve control structure of the twin-cylinder engine, reduces the weight of the overall structure, and improves the intake uniformity of the twin-cylinder at a small opening. The intake pipe body opening is connected and installed with the bracket assembly in an inclined manner, ensuring the stability and sealing of the product installation while facilitating the disassembly of the bracket as a whole for maintenance of the intake system, thereby improving the convenience of maintenance.

[0007] An inline twin-cylinder two-stroke engine intake system comprises an intake pipe assembly mounted on the engine and an injector bracket assembly mounted in conjunction with the intake pipe assembly; the intake pipe assembly comprises an intake pipe body, which is fitted onto the lower surface of the injector bracket assembly.

[0008] Furthermore, an intake pipe oblique opening is formed at the upper end of the intake pipe body for fitting with the injector bracket assembly, and a guide ring is formed outwardly along the radial direction of the intake pipe oblique opening, and the guide ring protrudes outward to form a guide ring support ear for fixed installation with the injector bracket assembly.

[0009] Furthermore, the injector bracket assembly includes a bracket body, an injector mounted on the bracket body, and a butterfly valve. The butterfly valve is arranged above the intake pipe body and the lower end of the butterfly valve extends into the intake pipe body.

[0010] Furthermore, the lower end surface of the bracket body is tilted and positioned to match the oblique opening of the air intake pipe. The lower end of the bracket body extends downward and bends to form a bracket buckle that matches the guide ring for clamping and installation.

[0011] Furthermore, the middle part of the injector is installed on the bracket body, and the lower end of the injector is formed with an injector mounting joint that is fixedly installed in conjunction with the intake pipe body. The end of the injector mounting joint is extended and bent to form a joint buckle that is clipped and installed in conjunction with the intake pipe body.

[0012] Furthermore, the intake pipe body is provided with an injector interface for cooperating with the injector mounting joint for installation, and the lower end of the injector interface protrudes outward to form a positioning buckle for cooperating with the joint buckle for clamping and installation.

[0013] Furthermore, a sealing ring positioning groove for sealing installation is formed in a downward depression between the oblique opening of the air intake pipe and the guide ring.

[0014] Furthermore, the intake pipe assembly further includes a steering gear mounted on the intake pipe body, and a position sensor is mounted on the intake pipe body.

[0015] An engine is provided, wherein the above-mentioned in-line two-cylinder two-stroke engine intake system is installed on the engine.

[0016] The beneficial effects of the present invention are as follows: the in-line twin-cylinder two-stroke engine intake system of the present invention adopts a design method of controlling dual valve plates with a single servo, which simplifies the valve plate control structure of the twin-cylinder engine, reduces the weight of the overall structure, and improves the intake uniformity of the twin-cylinder at a small opening. The intake pipe body opening is connected and installed with the bracket assembly in an inclined manner, ensuring the stability and sealing of the product installation, while facilitating the disassembly of the bracket as a whole for maintenance of the intake system, thereby improving the convenience of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is an axonometric diagram of the air intake system of the present invention;

[0019] Figure 2 This is a schematic structural diagram of the fuel injector bracket assembly of the present invention;

[0020] Figure 3 Schematic diagram of the air intake pipe assembly of the present invention;

[0021] Figure 4 A top view of the air intake system of the present invention;

[0022] Figure 5 It is a front view of the air intake system of the present invention;

[0023] Figure 6 This is a BB cross-sectional view of the present invention;

[0024] Figure 7 It is a cross-sectional view of the installation of the present invention;

[0025] Figure 8 This is a schematic diagram of the installation of the present invention. DETAILED DESCRIPTION

[0026] Figure 1 This is an axonometric diagram of the air intake system of the present invention; Figure 2 Schematic diagram of the support structure of the present invention; Figure 3 This is a partial schematic diagram of the air intake pipe of the present invention; Figure 4 A top view of the air intake system of the present invention; Figure 5 It is a front view of the air intake system of the present invention; Figure 6 This is a BB cross-sectional view of the present invention; Figure 7 It is a cross-sectional view of the installation of the present invention; Figure 8This is an installation diagram of the present invention; as shown in the figure, an in-line twin-cylinder two-stroke engine intake system includes an intake pipe assembly installed on the engine and an injector bracket assembly 1 installed in conjunction with the intake pipe assembly; the intake pipe assembly includes an intake pipe body 15, and the upper end of the intake pipe body 15 is formed with an intake pipe oblique opening that is fitted with the injector bracket assembly 1 for installation; the in-line twin-cylinder two-stroke engine intake system of the present invention adopts a design method of controlling dual valve plates with a single servo, which simplifies the valve plate control structure of the twin-cylinder engine, reduces the weight of the overall structure, and improves the intake uniformity of the twin-cylinder at a small opening. The intake pipe body opening is connected and installed with the bracket assembly in an inclined manner, which ensures the stability and sealing of the product installation while facilitating the disassembly of the bracket as a whole for maintenance of the intake system, thereby improving the convenience of maintenance.

[0027] In this embodiment, the intake pipe oblique opening is formed with a guide ring 10 in the radial direction outward, and the guide ring 10 is formed with a guide ring ear 11 protruding outward to match the injector bracket assembly 1 for fixed installation. Figure 3 As shown, an oblique opening structure is provided at the upper end of the intake pipe body 15, and a guide ring 10 structure is formed after protruding in the radial direction at the opening, which is used to connect and install with the bracket assembly. The tail end of the intake pipe is a reed valve installation and positioning structure. The two intake pipe bodies are processed using the principle of 3D printing. The intake pipe part is stacked, and the two pipe walls are stacked at the same time in an 8-shape, thereby ensuring that the inner diameter of each layer of the pipe is the same. The two pipe holes are processed at the same time by one clamping, which ensures accuracy and thus ensures flow at the same opening.

[0028] In this embodiment, the injector bracket assembly includes a bracket body 2, an injector 3 mounted on the bracket body 2, and a butterfly valve 18. The butterfly valve is positioned above the intake pipe body 2, with its lower end extending into the intake pipe body. The bracket body 2 provides an integrated mounting location for various components, facilitating later disassembly and maintenance.

[0029] In this embodiment, the lower end surface of the bracket body 2 is tilted and positioned to match the oblique opening of the intake pipe. The lower end of the bracket body 2 extends downward and bends to form a bracket buckle 6 that matches the guide ring 10 for clamping and installation. Figure 2 Figure 6 As shown, the bottom surface of the bracket is provided with a bracket buckle 6 that cooperates with the guide ring 10 of the intake pipe body. The installation is completed by inserting the bracket into the intake pipe locking mechanism, and the locking bolt 21 is used to fix and lock the bracket through the guide ring support ear 11.

[0030] In this embodiment, the middle portion of the injector 3 is mounted on the bracket body 2. The lower end of the injector 3 is formed with an injector mounting joint 4 that mates with the intake pipe body for fixed installation. The end of the injector mounting joint 4 extends and bends to form a joint clip 5 that clips into the intake pipe body for installation. Multiple injector nozzles 19 are mounted on the upper end of the injector 3 to connect with the remaining components. The middle portion of the injector 3 is mounted on the bracket body, and the lower end is formed with a joint structure that mates with the intake pipe body 15 for installation. The lower end of the joint is bent to form a joint clip 5 that clips into the intake pipe body for installation.

[0031] In this embodiment, the intake pipe body 15 is provided with an injector interface 13 for mating with the injector mounting connector. The lower end of the injector interface is formed with a protruding positioning clip 8 that engages with the connector clip for secure installation. The injector interface 13 is provided on the intake pipe body 15 for mating with the lower end of the injector for secure installation. The injector interface 13 is provided with an annular groove for mounting a sealing ring, ensuring overall sealing performance with the injector after installation. The positioning clip 8 engages with the connector clip 5 for secure installation and subsequent disassembly and maintenance.

[0032] In this embodiment, a seal ring positioning groove 12 is formed downwardly between the oblique opening of the intake pipe and the guide ring 10 for sealed installation. Supported by the locking mechanism, the arrangement of locking bolts 21 provides the required sealing pressure for the seal ring 20. To prevent the seal ring 20 from being squeezed by the bracket bottom surface during insertion, matching inclined surfaces are provided on the intake pipe body 15 and the bracket body 2. This ensures that the bracket's sliding movement is not affected by the seal ring 20, and provides sufficient pressure at the end of the sliding stage to ensure a seal on the end surface.

[0033] In this embodiment, the intake duct assembly also includes a servo 9 mounted on the intake duct body 15. A position sensor 16 is mounted on the intake duct body for use with a butterfly valve 18. A reed valve 7 is mounted at the end of the intake duct body 15. Two mounting shafts for the butterfly valves are machined at corresponding locations on the intake duct. These shafts are driven by a single servo 9, with a single position sensor 16 located at the end. This ensures that both butterfly valves maintain the same position under a single servo control command, and the position indicated by the position sensor is also the same. This avoids the deviations that occur during the traditional dual-servo signal execution process and eliminates the calibration work required for the servo and TPS position sensors. A pressure sensor 17 is also mounted on the bracket body for temperature and pressure monitoring.

[0034] An engine, wherein the engine 22 is equipped with the above-mentioned in-line two-cylinder two-stroke engine intake system.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the invention of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the invention of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the invention of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An inline twin-cylinder two-stroke engine intake system, characterized by: It includes an intake pipe assembly installed on the engine and an injector bracket assembly installed in conjunction with the intake pipe assembly; the intake pipe assembly includes an intake pipe body, the intake pipe body is fitted on the lower surface of the injector bracket assembly, an intake pipe oblique opening is formed on the upper end of the intake pipe body and fits with the injector bracket assembly for fitting, the intake pipe assembly also includes a servo installed on the intake pipe body and a mounting shaft driven by the servo, the mounting shaft is provided on the intake pipe body and is used to install two valve plates.

2. The inline twin-cylinder two-stroke engine intake system according to claim 1, characterized in that: The intake pipe oblique opening is formed with a guide ring outwardly in the radial direction, and the guide ring is protruded outwardly to form a guide ring support ear which is fixedly installed in conjunction with the injector bracket assembly.

3. The inline twin-cylinder two-stroke engine intake system according to claim 2, characterized in that: The injector bracket assembly includes a bracket body, an injector mounted on the bracket body, and a butterfly valve. The butterfly valve is arranged above the intake pipe body, and the lower end of the butterfly valve extends into the intake pipe body.

4. The inline twin-cylinder two-stroke engine intake system according to claim 3, characterized in that: The lower end surface of the bracket body is tilted and positioned to match the oblique opening of the air intake pipe. The lower end of the bracket body extends downward and bends to form a bracket buckle that matches the guide ring for clamping and installation.

5. The inline two-cylinder two-stroke engine intake system according to claim 3, characterized in that: The middle part of the injector is mounted on the bracket body, and the lower end of the injector is formed with an injector mounting joint for fixed installation in conjunction with the intake pipe body. The end of the injector mounting joint is extended and bent to form a joint buckle for clamping installation in conjunction with the intake pipe body.

6. The inline twin-cylinder two-stroke engine intake system according to claim 5, characterized in that: The intake pipe body is provided with an injector interface for cooperating with the injector mounting joint for installation. The lower end of the injector interface protrudes outward to form a positioning buckle for cooperating with the joint buckle for clamping and installation.

7. The inline two-cylinder two-stroke engine intake system according to claim 2, characterized in that: A sealing ring positioning groove for sealing installation is formed in a downward depression between the oblique opening of the air intake pipe and the guide ring.

8. The inline twin-cylinder two-stroke engine intake system according to claim 3, characterized in that: A position sensor is installed on the air intake pipe body.

9. An engine, characterized in that: The engine is equipped with an in-line two-cylinder two-stroke engine intake system as described in any one of claims 1 to 8.

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