Direct injection cylinder head in single cylinder

Abstract

The utility model relates to the technical field of motorcycle engines, and discloses a single-cylinder in-cylinder direct injection cylinder head which comprises a cylinder head body, a chain cavity, an air inlet channel, an air outlet channel, a nozzle installation channel and a combustion chamber, and the air inlet channel and the air outlet channel are communicated with the combustion chamber from the two sides of the cylinder head body respectively. The air inlet channel, the exhaust channel and the nozzle mounting channel are located on different side faces of the cylinder head body. The device has the advantages of convenience in installation of the valve mechanism, small size, convenience, reliability and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle engines, in particular to a single-cylinder direct-injection cylinder head. Background Art

[0002] A single-cylinder motorcycle engine is the simplest of all engines, consisting of a single cylinder. During operation, the mixture within the cylinder ignites and burns once for every one (two-stroke) or two (four-stroke) revolutions of the crankshaft. The cylinder head is a key component in a single-cylinder motorcycle engine. Located at the top of the cylinder, it seals the cylinder, guides the combustible mixture into the cylinder, and discharges the resulting exhaust gases. The cylinder head contains key components such as the airway, valves, valve seats, and spark plugs, all of which work together to ensure proper engine operation.

[0003] Chinese patent document CN101624955B discloses a saddle-type vehicle, which relates to an air-cooled engine, including a cylinder body constituting a cylinder for accommodating a piston in a freely reciprocating manner; a cylinder head forming a combustion chamber together with the cylinder body and having a main passage connected to the combustion chamber through an intake valve opening; an intake valve (intake valve) freely opened and closed at the intake valve opening; a fuel injection device having a nozzle for injecting fuel; and a secondary passage branching off from the upstream of the main passage and guiding air to the vicinity of the nozzle of the fuel injection device at least when the air-cooled engine is idling; wherein, below the main frame, the cylinder head is arranged at the front and the cylinder body is arranged at the rear, so that the central axis of the cylinder extends approximately horizontally in the front-to-back direction and the cylinder head is exposed to wind during driving; the fuel injection device is arranged on the cylinder head so that the injection passage from the side wall of the main passage injects fuel toward the intake valve opening; the front end of the injector is inserted into the mounting hole through the retainer. Therefore, the nozzle at the front end of the injector is set close to the intake valve opening, and the nozzle is located in the area connected to the front end of the valve stem when the valve head closes the intake valve opening, the intersection of the axis of the intake valve and the center line of the intake port, and the intersection of the center line of the intake port and the external connection port at the upstream end of the intake port.

[0004] This existing technology has the following shortcomings: an intake channel, an exhaust channel and a nozzle channel for installing a nozzle are provided in the cylinder head, and the nozzle channel is provided above the intake channel, and the nozzle opening of the nozzle channel is connected to the middle part of the intake channel. The nozzle channel occupies the longitudinal space, which reduces the installation space of the valve mechanism on the upper part of the cylinder head and increases the difficulty of arranging the valve mechanism. Utility Model Content

[0005] In order to solve the technical problem of how to facilitate the installation of a valve train without increasing the size of an engine, the utility model provides a single-cylinder in-cylinder direct-injection cylinder head, comprising a cylinder head body, a chain cavity, an intake duct, an exhaust duct, a nozzle mounting channel and a combustion chamber, wherein the intake duct and the exhaust duct are connected to the combustion chamber from two sides of the cylinder head body respectively, and is characterized in that the intake duct, the exhaust duct and the nozzle mounting channel are located on different sides of the cylinder head body.

[0006] Preferably, the nozzle mounting channel is directly connected to the combustion chamber.

[0007] Furthermore, the intake duct and exhaust duct are arranged relative to each other in the cylinder head body with the combustion chamber as the center, and are respectively located on the front and rear sides of the cylinder head body. The nozzle mounting channel is located on the left or right side of the cylinder head body. The end of the nozzle mounting channel is a nozzle hole. The nozzle hole is arranged close to the intake duct and exhaust duct, and is connected to the combustion chamber between the intake duct and the exhaust duct.

[0008] In order to avoid affecting the installation of the chain cavity, the nozzle installation channel and the chain cavity are arranged relatively to each other in the cylinder head body with the combustion chamber as the center.

[0009] In order to ensure the sealing of the valve and facilitate the maintenance and replacement of the seat ring, the ends of the intake duct and the exhaust duct connected to the combustion chamber are both provided with seat ring holes.

[0010] In order to improve the power and efficiency of the engine and ensure the intake and exhaust volumes at the same time, the intake passages are dual intake passages and the exhaust passages are dual exhaust passages.

[0011] In order to facilitate ignition, a spark plug is vertically provided above the combustion chamber, and the spark plug is connected to the combustion chamber.

[0012] Preferably, the spark plug is connected at the center of the combustion chamber.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the prior art, the high-pressure nozzle is placed directly below the intake duct and must pass through the middle of the intake duct, which makes it difficult to ensure structural strength and may also encroach on the intake duct space, causing a sudden change in the cross-sectional shape and size of the intake duct, thereby reducing intake performance. However, the present invention locates the nozzle mounting channel on a different side of the cylinder head body from the intake and exhaust ducts, namely, on a side of the cylinder head body with ample free space. This does not increase the volume of the cylinder head or occupy the installation space of the valve train, and rationally allocates the available space of the cylinder head body. Not only is the structure simple, but it also has no impact on the layout of the intake and exhaust ducts or the valve train. Fuel is injected directly into the combustion chamber through the high-pressure nozzle, without affecting the layout of the intake duct.

[0015] 2. The utility model has the advantages of clever structural design, convenient and reliable use, and low cost. It can effectively simplify the structural arrangement of the cylinder head for direct injection of air into the cylinder, reduce production costs and improve product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of an embodiment of a single-cylinder direct-injection cylinder head according to the present invention;

[0017] Figure 2 for Figure 1 Bottom view of

[0018] Figure 3 for Figure 2 AA section view;

[0019] Figure 4 for Figure 2 BB cross-sectional view. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] Those skilled in the art will understand that the valve train is a crucial component of the engine, responsible for timing the opening and closing of the intake and exhaust valves of each cylinder to ensure timely entry of fresh combustible mixture and timely expulsion of exhaust gases from the cylinder. It primarily consists of the valve train and valve assembly. The valve train includes components such as the crankshaft timing gear, camshaft timing gear, camshaft, push rods, rocker arms, and rocker arm shafts. These components work together to convert the crankshaft's rotational motion into the opening and closing motion of the valves. The valve assembly includes components such as the valves, valve guides, valve springs, valve spring seats, valve oil seals, and valve seats.

[0022] The reference numerals in the drawings of the specification include: cylinder head body 1, chain chamber 2, intake duct 3, exhaust duct 4, nozzle mounting channel 5, combustion chamber 6, intake duct seat ring hole 7, exhaust duct seat ring hole 8, nozzle hole 9, spark plug 10.

[0023] Example 1

[0024] like Figure 1-4As shown, a single-cylinder direct injection cylinder head includes a cylinder head body 1, a chain chamber 2, an intake duct 3, an exhaust duct 4, a nozzle mounting channel 5 and a combustion chamber 6. The combustion chamber 6 is located at the bottom of the cylinder head body 1, and the upper part of the combustion chamber 6 is used to install the valve mechanism. The intake duct 3 and the exhaust duct 4 are respectively connected to the combustion chamber 6 from both sides of the cylinder head body 1. The intake duct 3, the exhaust duct 4 and the nozzle mounting channel 5 are located on different sides of the cylinder head body 1. The intake duct 3 is located on the front side of the cylinder head body 1, the exhaust duct 4 is located on the rear side of the cylinder head body 1, and the nozzle mounting channel 5 is located on the right side of the cylinder head body 1. The front, back, left and right here are represented by Figure 2 The combustion chamber 6 is divided as a reference point.

[0025] The nozzle installation channel 5 is directly connected to the combustion chamber 6 . The nozzle installation channel 5 is used to set a nozzle, and the nozzle can directly spray fuel into the combustion chamber 6 .

[0026] The intake duct 3 and the exhaust duct 4 are arranged relative to each other in the cylinder head body 1 with the combustion chamber 6 as the center. The nozzle mounting channel 5 is located on the right side of the cylinder head body 1. One end of the nozzle mounting channel 5 connected to the combustion chamber 6 is the nozzle hole 9. The nozzle hole 9 is arranged close to the intake duct 3 and the exhaust duct 4, and is connected to the combustion chamber 6 between the intake duct 3 and the exhaust duct 4.

[0027] The nozzle installation channel 5 and the chain cavity 2 are arranged opposite to each other in the cylinder head body 1 with the combustion chamber 6 as the center, and the chain cavity 2 is located on the left side.

[0028] The ends of the intake and exhaust ducts 3 and 4 that connect to the combustion chamber 6 are termini. These termini are provided with intake and exhaust valve seat holes 7 and 8, respectively. These seat holes are used to mount the intake and exhaust valve seats, primarily ensuring valve sealing. During engine operation, the valves are constantly opened and closed to control the intake and exhaust processes. To ensure that the valves fit tightly against the valve seats when closed and prevent gas leakage, the intake and exhaust valve seats must be highly precise and wear-resistant. This not only improves engine power and efficiency but also reduces harmful gas emissions.

[0029] The dual intake ducts 3 and exhaust ducts 4 increase the engine's air intake volume, allowing more air and fuel mixture to enter the cylinders, thereby improving combustion efficiency. This helps increase the engine's power output and torque, making the motorcycle perform better during acceleration and climbing.

[0030] A spark plug 10 is vertically provided above the combustion chamber 6 , and the spark plug 10 is connected to the combustion chamber 6 .

[0031] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A single-cylinder direct injection cylinder head, comprising a cylinder head body, a chain chamber, an intake duct, an exhaust duct, a nozzle mounting channel, and a combustion chamber, wherein the intake duct and the exhaust duct are connected to the combustion chamber from both sides of the cylinder head body, characterized in that: The air inlet passage, the exhaust passage and the nozzle installation passage are located on different sides of the cylinder head body.

2. The single-cylinder direct-injection cylinder head according to claim 1, characterized in that: The nozzle mounting channel is directly connected to the combustion chamber.

3. The single-cylinder direct injection cylinder head according to claim 2, characterized in that: The intake duct and exhaust duct are arranged relative to each other in the cylinder head body with the combustion chamber as the center, and are respectively located on the front and rear sides of the cylinder head body. The nozzle mounting channel is located on the left or right side of the cylinder head body. The end of the nozzle mounting channel is a nozzle hole. The nozzle hole is arranged close to the intake duct and exhaust duct, and is connected to the combustion chamber between the intake duct and the exhaust duct.

4. The single-cylinder direct-injection cylinder head according to claim 3, characterized in that: The nozzle installation channel and the chain cavity are arranged opposite to each other in the cylinder head body with the combustion chamber as the center.

5. The single-cylinder direct injection cylinder head according to any one of claims 1 to 4, characterized in that: The ends of the intake passage and the exhaust passage communicating with the combustion chamber are both provided with seat ring holes.

6. The single-cylinder direct-injection cylinder head according to claim 5, characterized in that: The air intake passage is a dual air intake passage, and the exhaust passage is a dual exhaust passage.

7. The single-cylinder direct-injection cylinder head according to claim 6, characterized in that: A spark plug is vertically arranged above the combustion chamber, and the spark plug is connected to the combustion chamber.

8. The single-cylinder direct-injection cylinder head according to claim 7, characterized in that: The spark plug is connected to the center of the combustion chamber.

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