Fuel injection structure, engine and motorcycle

Abstract

The present invention relates to an oil injection structure, an engine and a motorcycle, comprising: a cylinder head cover, the cylinder head cover is formed with an oil circuit, the oil circuit has an oil injection port; a valve assembly, the valve assembly includes a valve guide and a valve stem that are slidably sleeved with each other and a spring disk arranged at the end of the valve stem; and an elastic reset member, the elastic reset member is arranged at the periphery of the valve stem and the end thereof is in conflict with the spring disk, and the elastic reset member is located between the oil injection port and the valve stem. The elastic reset member has a breaking effect on the oil column so that the oil column is evenly dispersed, and the dispersed lubricating oil finally passes through each oil passing part and is sprayed onto the valve stem, so that the periphery of the entire valve stem can be relatively evenly and completely covered with the lubricating oil, ensuring that the valve stem and the valve guide slide relatively smoothly, avoiding noise generation, strengthening the quietness of the engine and the motorcycle, and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of motorcycles, and in particular to an oil injection structure, an engine and a motorcycle. Background Art

[0002] In the engines of motor vehicles such as motorcycles, valve mechanisms are usually installed. The valve mechanisms are divided into intake valves and exhaust valves. The intake valve is used to input air into the engine, and the exhaust valve is used to discharge the exhaust gas generated by the engine. The valve stem is in the valve sleeve and can reciprocate. Since the arrangement of valve-related parts is relatively compact, and the valve stem is in high-speed reciprocating motion in the valve sleeve during the movement of the engine, the lubrication between the existing valve stem and the valve sleeve is achieved by the oil splashed by the relevant parts in the cylinder head cover during the movement. This will cause abnormal wear or may generate loud noise due to the lack of effective and sufficient lubrication between the valve stem and the valve sleeve, thereby affecting the use experience of the motorcycle. Summary of the invention

[0003] Based on this, it is necessary to provide an oil injection structure, an engine and a motorcycle, aiming to solve the problems of poor lubrication effect and high noise in the prior art.

[0004] The technical solution is as follows:

[0005] On the one hand, the present application provides an oil injection structure, which includes:

[0006] A cylinder head cover, wherein the cylinder head cover is formed with an oil passage, and the oil passage has an oil injection port;

[0007] A valve assembly, the valve assembly comprising a valve guide and a valve stem that are slidably sleeved with each other, and a spring disc arranged at the end of the valve stem; and

[0008] An elastic return member is arranged on the outer periphery of the valve stem and an end of the elastic return member contacts the spring disk. The elastic return member is located between the oil injection port and the valve stem.

[0009] The oil injection structure of the above scheme is applied and installed in the engine of a motorcycle, which can realize directional oil injection lubrication of the matching part of the valve stem and the valve oil seal to improve the lubrication effect between the valve and the guide tube, and reduce or eliminate noise. Specifically, the valve assembly is installed inside the cylinder head cover, and the elastic reset member is installed on the valve assembly to realize the automatic reset of the valve stem. Since an oil circuit is made on the cylinder head cover, and the oil beam sprayed from the oil injection port of the oil circuit is directly sprayed to the spring position above the valve oil seal. In addition, the elastic reset member is arranged between the oil injection port and the valve stem. In this way, during operation, the lubricating oil (such as engine oil) in the oil circuit can be ejected from the oil injection port to form an oil column, which is directly ejected onto the elastic return part. The elastic return part has a breaking-up effect on the oil column to disperse the oil column. The dispersed lubricating oil eventually passes through various oil-passing parts and is sprayed to the position where the valve stem and the valve oil seal cooperate. When the valve stem reciprocates, it can effectively improve the lubrication between the valve stem and the valve sleeve, avoid noise, enhance the quietness of the engine and motorcycle, and improve the user experience.

[0010] The technical solution of this application is further described below:

[0011] In one of the embodiments, a valve oil seal is provided on the valve guide tube, and the oil injection path of the oil injection port extends to the upper part of the valve oil seal.

[0012] In one of the embodiments, the elastic return member is provided with at least two oil passing portions, the oil passing portions are oil passing gaps, and at least two of the oil passing gaps are spaced apart along the length direction of the valve stem.

[0013] In one of the embodiments, the elastic return member is further provided with an oil guiding arc surface, and the oil guiding arc surface is located between two adjacent oil passing gaps.

[0014] In one embodiment, the elastic reset member is an elastic sleeve, the oil passing portion is an oil passing hole opened on the wall of the elastic sleeve, and the oil passing holes are multiple and spaced apart and dispersed.

[0015] In one embodiment, the number of the oil injection ports is at least two, and the oil injection ports are arranged at intervals around the outer circumference of the elastic return member.

[0016] In one embodiment, the outer wall of the valve stem is recessed to form at least two oil accumulation grooves, the oil accumulation grooves extend along the length direction of the valve stem, and at least two of the oil accumulation grooves are arranged at intervals along the circumference of the valve stem; or, the outer wall of the valve stem is recessed to form at least two oil accumulation grooves, the oil accumulation grooves extend along the circumference of the valve stem, and at least two of the oil accumulation grooves are arranged at intervals along the length direction of the valve stem.

[0017] In one embodiment, the valve guide is provided with a spring disk, the valve stem is provided with a spring seat spaced opposite to the spring disk, and the elastic return member is pressed between the spring disk and the spring seat.

[0018] On the other hand, the present application also provides an engine, which includes the fuel injection structure as described above.

[0019] In addition, the present application also provides a motorcycle, which includes the engine as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the fuel injection structure according to an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 10. Cylinder head cover; 11. Oil circuit; 12. Oil injection port; 20. Valve guide; 30. Valve stem; 40. Elastic return member; 50. Oil passing part; 60. Spring plate; 70. Spring seat; 80. Rocker arm mechanism; 90. Valve oil seal. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0024] It should be noted that when an element is referred to as being "fixed on", "arranged on" or "mounted on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time; the specific method of fixedly connecting one element to another element can be achieved by existing technologies, which will not be described in detail here, and preferably a threaded connection is used.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0027] The present application requires a motorcycle, which can be any model or structure of motorcycle products commonly available on the market, and can be a fuel-powered motorcycle, an electric motorcycle, a hybrid motorcycle, etc., without specific limitation herein.

[0028] The following explanation is made by taking a fuel-powered motorcycle as an example. It is understandable that in addition to the frame, electronic control system, transmission system, and wheels, a motorcycle also includes an engine. The engine is the heart of the motorcycle and is used to provide the power necessary for normal driving. The engine is provided with a valve mechanism, which is used to supply oxygen-containing air to the engine when burning fuel, or to discharge exhaust gas generated by combustion from the engine through piston movement. This scheme proposes a fuel injection structure, which includes a valve mechanism and a new type of fuel supply method to assist the valve mechanism in working more smoothly, reliably and silently.

[0029] like Figure 1 As shown, an oil injection structure of an embodiment of the present application includes: a cylinder head cover 10, a valve assembly and an elastic return member 40. The cylinder head cover 10 is a part of the engine cylinder housing, and the cylinder head cover 10 is formed with an oil circuit 11, and the oil circuit 11 has an oil injection port 12. In this way, a separate external oil circuit 11 can be eliminated, which is conducive to simplifying the engine structure and improving reliability.

[0030] The valve assembly includes a valve guide 20 and a valve stem 30 that are slidably connected to each other and a spring disk 60 arranged at the end of the valve stem 30; the elastic return member 40 is arranged on the outer periphery of the valve stem 30 and its end is in contact with the spring disk 60, and the elastic return member 40 is located between the oil injection port 12 and the valve stem 30, and the elastic return member 40 is provided with at least two oil passing parts 50.

[0031] In summary, the implementation of the technical solution of the present application will have the following beneficial effects: the oil injection structure of the above solution is applied and installed in the engine of a motorcycle, which can realize directional oil injection lubrication of the matching parts of the valve stem and the valve oil seal, improve the lubrication between the valve stem and the valve guide, and reduce or eliminate noise. Specifically, the valve assembly is installed inside the cylinder head cover 10, and the elastic reset member 40 is installed on the valve assembly to realize the automatic reset of the valve stem 30 after the compression stroke. Since the oil circuit 11 is made on the cylinder head cover 10, in addition, the elastic reset member 40 is arranged between the oil injection port 12 and the valve stem 30, and the elastic reset member 40 is provided with at least two oil passing parts 50. In this way, during operation, the lubricating oil (such as engine oil) in the oil circuit 11 can be sprayed out from the oil injection port 12 to form an oil column, and the oil column is directly sprayed onto the elastic return member 40. The elastic return member 40 has a breaking up effect on the oil column so that the oil column is evenly dispersed. The dispersed lubricating oil finally passes through the oil passing portion 50 and is sprayed to the matching position of the valve stem 30 and the valve oil seal, so that the outer periphery of the entire valve stem 30 can have more lubricating oil to lubricate the valve stem and the guide tube, thereby ensuring that the valve stem 30 and the valve guide tube 20 slide smoothly relative to each other, improving the wear caused by relative movement and reducing noise generation, thereby increasing the service life of the engine and improving the quietness of the motorcycle, thereby improving the user experience.

[0032] In this solution, the valve assembly also includes a valve seat, which is mounted on the cylinder head, and the valve guide 20 is press-fitted on the cylinder head, thereby ensuring that the entire valve assembly installation structure is stable.

[0033] Please continue reading Figure 1 In this solution, the engine further includes a rocker arm mechanism 80. The intermittent driving force output by the camshaft to the rocker arm mechanism can push the valve stem 30 to reciprocate in the valve guide 20, and the air is sucked into the cylinder combustion chamber to be fully mixed with the fuel, thereby improving the fuel combustion efficiency. In one embodiment, the elastic reset member 40 is a valve spring. The valve spring can be directly mounted on the outside of the valve stem 30 and the valve guide 20, and the mounting structure is simple and easy to assemble and disassemble. The telescopic deformation of the valve spring can provide the lift reset driving force of the valve stem 30, and the implementation method and principle are simple.

[0034] Please continue reading Figure 1 In order to ensure that the valve spring is firmly installed and will not jump out during the expansion and contraction deformation process, the valve guide 20 is further provided with a spring seat 70, the valve stem 30 is provided with a spring seat 60 spaced opposite to the spring seat 70, and the elastic reset member 40 is pressed and arranged between the spring plate 60 and the spring seat 70. In this way, the spring plate 60 and the spring seat 70 can better constrain the freedom of the two ends of the valve spring, so that the valve spring cannot be loosened from the rod length direction of the valve stem 30, and the valve stem 30 is ensured to be reliably reset.

[0035] Specifically, the valve spring is a spiral structure, and the oil-passing portion 50 is a spiral gap within a certain height fault in the spiral structure, that is, the oil-passing gap in this case, and the oil-passing gap is at least two and is arranged at intervals along the length direction of the valve stem 30. In this way, the oil column sprayed from the oil injection port 12 hits the spiral spring, and can be dispersed through the multiple oil-passing gaps spaced at intervals in the length direction of the stem and finally sprayed to the mouth or upper part of the valve oil seal, so that the valve stem 30 has good oil lubrication during the entire movement process, ensuring the lubrication effect and reducing noise generation.

[0036] It should be noted that the oil injection action preferably occurs when the valve stem is at 300 to 1 / 2 valve lift, because at this time the length of the valve stem 30 exposed from the valve guide 20 is appropriate, providing sufficient area for the lubricating oil to adhere; and the compression (or extension) of the valve spring is appropriate, which can form a spiral gap of appropriate size (i.e., oil gap), making it easier for the lubricating oil to be broken up and sprayed through the oil gap to the mouth or upper part of the valve oil seal.

[0037] It should be noted that the above-mentioned oil-passing gap is actually a multi-stage gap of the spring spiral gap facing the side part of the oil injection port 12, and only this multi-stage gap is actually used to disperse the engine oil.

[0038] It is easy to understand that the cross section of the coil spring is circular, that is, the elastic reset member 40 is also provided with an oil guiding arc surface arranged toward the oil injection port 12, and the oil guiding arc surface is located between two adjacent oil passing gaps. In this way, the oil arc surface has a guiding effect on the injected lubricating oil, which can reduce the blocking force on the oil column, making it easier for the lubricating oil to be dispersed and sprayed onto the valve stem 30, avoiding excessive resistance, splashing the lubricating oil around to cause waste, and affecting the lubricating efficiency of the lubricating oil.

[0039] Alternatively, as an alternative embodiment of the valve spring, in another embodiment, the elastic reset member 40 is an elastic sleeve, and the oil-passing portion 50 is an oil-passing hole opened on the wall of the elastic sleeve, and the oil-passing holes are multiple and spaced and dispersed. Specifically, the elastic sleeve can be made of rubber with good elasticity, and can achieve reciprocating motion of the valve stem 30 under the pressure of the rocker mechanism 80); when the camshaft rotates, the elastic sleeve stretches and resets under the action of the rebound force, pushing the valve stem 30 to lift and reset. In this process, the oil-passing hole opened on the wall of the elastic sleeve can still allow the lubricating oil sprayed from the oil injection port 12 to pass through and spray onto the valve stem 30, ensuring the lubrication effect between the valve stem 30 and the valve guide 20, and preventing noise caused by lack of oil lubrication friction.

[0040] Preferably, the number of the oil injection ports 12 is at least two, and the oil injection ports 12 are arranged at intervals around the outer circumference of the elastic return member 40. In this way, the lubricating oil on the cylinder head cover 10 can be sprayed onto the valve stem 30 from all directions at the same time, which can ensure that the valve stem 30 is evenly and completely attached with the lubricating oil to the greatest extent, thereby ensuring the lubrication effect.

[0041] In addition, considering that the valve stem 30 and the valve guide 20 frequently slide relative to each other, the lubricating oil attached to the valve stem 30 will be scraped off by the valve guide 20, causing the valve stem 30 to fall into a poor lubrication condition again. Based on this, the outer wall of the valve stem 30 is concavely formed with at least two oil accumulation grooves, the oil accumulation grooves are extended along the length direction of the valve stem 30, and at least two of the oil accumulation grooves are arranged at intervals along the circumference of the valve stem 30; or, the outer wall of the valve stem 30 is concavely formed with at least two oil accumulation grooves, the oil accumulation grooves are extended along the circumference of the valve stem 30, and at least two of the oil accumulation grooves are arranged at intervals along the length direction of the valve stem 30. In this way, by providing the oil accumulation grooves, the lubricating oil can be stored in the oil accumulation grooves, so that the lubricating oil will not or is difficult to be scraped off the surface of the valve stem 30, and the valve stem 30 and the valve guide 20 can be continuously guaranteed to have a better lubrication condition.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fuel injection structure, characterized in that: include: A cylinder head cover, wherein the cylinder head cover is formed with an oil passage, and the oil passage has an oil injection port; A valve assembly, the valve assembly comprising a valve guide and a valve stem that are slidably sleeved with each other, and a spring disc arranged at the end of the valve stem; an elastic return member, wherein the elastic return member is arranged on the outer periphery of the valve stem and an end portion thereof contacts the spring disk, and the elastic return member is located between the oil injection port and the valve stem; and A valve oil seal is arranged on the valve guide, and the oil injection path of the oil injection port extends to the upper part of the valve oil seal. The lubricating oil is sprayed out from the oil injection port to form an oil column, which is sprayed onto the elastic return member. The elastic return member breaks up the oil column. The elastic return member is provided with an oil passing portion, and the dispersed lubricating oil passes through the oil passing portion and is sprayed to the position where the valve stem and the valve oil seal cooperate.

2. The oil injection structure according to claim 1, characterized in that: The elastic return member is provided with at least two oil passing parts, the oil passing parts are oil passing gaps, and at least two of the oil passing gaps are arranged at intervals along the length direction of the valve stem.

3. The oil injection structure according to claim 2, characterized in that: The elastic reset member is also provided with an oil guiding arc surface, and the oil guiding arc surface is located between two adjacent oil passing gaps.

4. The oil injection structure according to claim 1, characterized in that: The elastic reset member is an elastic sleeve, the oil passing portion is an oil passing hole opened on the cylinder wall of the elastic sleeve, and the oil passing holes are multiple and spaced and dispersedly arranged.

5. The oil injection structure according to claim 1, characterized in that: The number of the oil injection ports is at least two, and the oil injection ports are arranged around the outer circumference of the elastic return member at intervals.

6. The oil injection structure according to claim 1, characterized in that: At least two oil accumulation grooves are formed in the outer wall of the valve stem. The oil accumulation grooves are extended along the length direction of the valve stem, and at least two of the oil accumulation grooves are arranged at intervals along the circumference of the valve stem.

7. The oil injection structure according to claim 1, characterized in that: At least two oil accumulation grooves are formed in the outer wall of the valve stem. The oil accumulation grooves are extended along the circumference of the valve stem, and at least two of the oil accumulation grooves are spaced apart along the length direction of the valve stem.

8. The oil injection structure according to claim 1, characterized in that: The valve guide is provided with a spring disk, the valve stem is provided with a spring seat spaced opposite to the spring disk, and the elastic return member is pressed and arranged between the spring disk and the spring seat.

9. An engine, characterized in that: It comprises the oil injection structure as described in any one of claims 1 to 8 above.

10. A motorcycle, characterized in that: Comprising an engine as claimed in claim 9 above.

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