Rocker arm arrangement structure of four-valve engine

Abstract

The invention discloses a four-valve engine rocker arm arrangement structure, and relates to the technical field of engine parts, the four-valve engine rocker arm arrangement structure comprises an engine cylinder cover, a rocker arm shaft seat, a cam transmission assembly, an air inlet rocker arm assembly and an exhaust rocker arm assembly; the rocker arm shaft seat is mounted on the mounting position, and two groups of rocker arm mounting positions are arranged on the rocker arm shaft seat; the cam transmission assembly is installed on an engine cylinder cover. The air inlet rocker arm assembly is mounted on one group of rocker arm mounting positions; the exhaust rocker arm assembly is mounted on the other group of rocker arm mounting positions; according to the technical key points, the air inlet rocker arm assembly and the exhaust rocker arm assembly both adopt independent rocker arm shafts, namely one rocker arm corresponds to one rocker arm shaft, a special rocker arm shaft seat structure is designed, a proper rocker arm ratio is ensured, and the rocker arm shafts of the air inlet rocker arm assembly and the exhaust rocker arm assembly are staggered and arranged in parallel; the rocker arm is more convenient to operate and install, good in using effect and good in application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine components, and specifically relates to a rocker arm arrangement structure for a four-valve engine. Background Technique

[0002] An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc.

[0003] A valve rocker arm is a double-armed lever with a rocker arm shaft as the fulcrum, and the lengths of the two arms are unequal. There are threaded holes at the short arm end for installing valve clearance adjusting screws, and the long arm end is machined into an arc surface for pushing the valve.

[0004] The valve rocker arm is installed on the rocker arm seat through the rocker arm shaft. One end is driven by the camshaft through the tappet, and the other end acts on the valve stem together with the valve spring to control the opening and closing of the valve. The opening and closing of the valve are completed by the actions of the tappet and the rocker arm. Metal connecting rods are usually used to connect between the rocker arms, and the cam lifts the connecting rod to push the rocker arm to achieve the opening and closing of the valve.

[0005] The existing patent authorization announcement number is CN214196432U, and the invention patent with the name of a valve rocker arm assembly and a four-stroke rocker arm mechanism applying the same records the technical field related to motorcycle accessories, and solves the problem that common valve rocker arms need to generate friction every time the valve is opened. As the rotational speed increases, the number and frequency of opening the valve per unit time also increase, and it is more difficult to form an oil film, and the generated noise and wear also increase; thus resulting in a large engine noise and serious wear between the valve and the valve rocker arm. The key points of its technical solution are that it includes a main rocker arm, a rotating mechanism is rotatably penetrated through the middle of the main rocker arm, a rotating through groove is opened on the side wall of one end of the main rocker arm, and a rolling pair is rotatably connected in the rotating through groove, achieving the purpose of not only facilitating a significant reduction in the wear force between the camshaft and the main rocker arm, but also facilitating the reduction of the noise caused by the relatively large friction force between the camshaft and the main rocker arm, and having good stability and service life.

[0006] However, the above rocker arm mechanism is mainly applicable to old engines with square valves, but it is not applicable to engines with an inclined valve layout after improvement. Due to the inclined valve layout, the driving rocker arm cannot meet its working requirements. Therefore, in the prior art, the method of sharing the rocker arm shaft is mostly adopted. At this time, due to different valve positions, the rocker arm lengths are different. To ensure that the valve reaches the position, the rocker arm shaft needs to be inclined, which is not good for the machining of the rocker arm shaft hole and the installation of the rocker arm shaft, and the long-term use effect is not good;

[0007] In summary, the existing rocker arm structures of engines all have certain drawbacks during use and do not meet people's usage requirements. Therefore, we propose a rocker arm arrangement structure for a four-valve engine. Summary of the Invention

[0008] To overcome the deficiencies of the prior art, the embodiments of the present application provide a rocker arm arrangement structure for a four-valve engine. Both the intake rocker arm assembly and the exhaust rocker arm assembly adopt independent rocker arm shafts, that is, one rocker arm corresponds to one rocker arm shaft, and a special rocker arm shaft seat structure is designed to ensure a suitable rocker ratio, and the rocker arm shafts of the intake rocker arm assembly and the exhaust rocker arm assembly are staggered and arranged in parallel, making the operation and installation of the rocker arms more convenient, with good usage effects and a good usage prospect, thus effectively solving the problems raised in the background art.

[0009] The technical solution adopted by the embodiments of the present application to solve its technical problems is as follows:

[0010] A rocker arm arrangement structure for a four-valve engine, comprising an engine cylinder head, a rocker arm shaft seat, a cam drive assembly, an intake rocker arm assembly, and an exhaust rocker arm assembly:

[0011] An installation position is provided on the upper end surface of the engine cylinder head;

[0012] The rocker arm shaft seat is installed on the installation position, and two groups of rocker arm installation positions are provided thereon;

[0013] The cam drive assembly is installed on the engine cylinder head;

[0014] The intake rocker arm assembly is installed on one group of rocker arm installation positions;

[0015] The exhaust rocker arm assembly is installed on the other group of rocker arm installation positions;

[0016] Among them, the intake rocker arm assembly and the exhaust rocker arm assembly are arranged in parallel, the length of the exhaust rocker arm assembly is longer than that of the intake rocker arm assembly, the lever ratios of the exhaust rocker arm assembly and the intake rocker arm assembly are the same, and two groups of valve assemblies are installed on both the intake rocker arm assembly and the exhaust rocker arm assembly.

[0017] Preferably, both the intake rocker arm assembly and the exhaust rocker arm assembly include a rocker arm rod body, a rocker arm shaft, and a mounting bolt:

[0018] A cylindrical connection hole position is laterally provided on the rocker arm rod body;

[0019] The rocker arm shaft is inserted into the connection hole position;

[0020] The lower end of the mounting bolt penetrates through the rocker arm shaft, the rocker arm rod body, and the rocker arm shaft seat and is connected to the engine cylinder head, and the rocker arm shafts on the intake rocker arm assembly and the exhaust rocker arm assembly are arranged in parallel.

[0021] Preferably, a weight-reducing hole is provided at the upper end of the rocker arm rod body away from the rocker arm shaft seat, and a roller assembly is installed at one end of the rocker arm rod body away from the valve assembly.

[0022] Preferably, the roller assembly includes a roller and a roller pin. The roller is rotatably installed on the rocker arm rod body through the roller pin, and the outer surfaces of two cams at different positions on the cam drive assembly are respectively in contact with the outer surfaces of the two rollers.

[0023] Preferably, a roller oil inlet hole is provided on the rocker arm rod body corresponding to the roller position, a roller pin oil inlet hole is provided at one end of the rocker arm rod body corresponding to the roller, and an elephant foot oil inlet hole is provided on the rocker arm rod body corresponding to the rocker arm shaft position.

[0024] Preferably, a through-pin oil inlet hole is provided at the rocker arm installation position on the rocker arm shaft seat, and the two through-pin oil inlet holes are communicated through a rocker arm oil passage.

[0025] Preferably, one of the through-pin oil inlet holes is communicated with an oil supply passage on the engine cylinder head, and the roller oil inlet hole, the roller pin oil inlet hole, and the elephant foot oil inlet hole are all communicated with the through-pin oil inlet hole.

[0026] Preferably, the rocker arm installation position on the rocker arm shaft seat is arc-shaped, and a positioning pin hole for connecting with the engine cylinder head is provided at the bottom of the rocker arm shaft seat.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects:

[0028] First, the present invention discloses a rocker arm arrangement structure for a four-valve engine. Both the intake rocker arm assembly and the exhaust rocker arm assembly adopt independent rocker arm shafts, that is, one rocker arm corresponds to one rocker arm shaft, and a special rocker arm shaft seat structure is designed to ensure a proper rocker ratio, and the rocker arm shafts of the intake rocker arm assembly and the exhaust rocker arm assembly are staggered and arranged in parallel, making the operation and installation of the rocker arms more convenient, with good use effects and good application prospects.

[0029] Second, the present invention discloses a rocker arm arrangement structure for a four-valve engine. A special rocker arm shaft seat structure is designed, so that the two rocker arm shafts are respectively installed and fixed on the engine cylinder head together with the rocker arm shaft seat through a mounting bolt, making the installation of the rocker arm shaft and the rocker arm shaft seat convenient. In addition, an axial positioning is realized between the rocker arm and the rocker arm shaft through a clever cooperation structure, making the fixing effect of the rocker arm shaft better and having high stability during use and good application prospects.

[0030] Thirdly, the present invention describes a rocker arm arrangement structure for a four-valve engine, which involves a good oil circuit. Centered on the oil hole on the through-pin, other parts are all connected to it. When in use, lubricating oil can be directly transported from the engine cylinder head, without the need to construct and connect the lubricating oil circuit multiple times. The installation is relatively convenient, the use effect is good, and it has a good application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the present invention in the use state;

[0032] Figure 2 is a schematic structural diagram of the whole of the present invention;

[0033] Figure 3 is a schematic connection structure diagram of the cam drive assembly in the present invention;

[0034] Figure 4 is a schematic diagram of other connection structures of the cam drive assembly in the present invention;

[0035] Figure 5 is a schematic diagram of the overall installation state of the rocker arm assembly in the present invention;

[0036] Figure 6 is a schematic diagram of the installation state of the rocker arm assembly in the present invention;

[0037] Figure 7 is a schematic structural diagram of the rocker arm shaft seat in the present invention;

[0038] Figure 8 is a schematic diagram of the partial sectional structure of the rocker arm shaft seat in the present invention;

[0039] Figure 9 is a schematic side sectional structure diagram of the rocker arm shaft seat and the rocker arm shaft in the present invention;

[0040] Figure 10 is a schematic structural diagram of the rocker arm shaft seat in the present invention;

[0041] Figure 11 is a schematic sectional structure diagram of the rocker arm shaft seat in the present invention.

[0042] Reference numerals: 1, engine cylinder head; 2, rocker arm shaft seat; 3, cam drive assembly; 4, intake rocker arm assembly; 5, exhaust rocker arm assembly; 6, valve assembly; 7, rocker arm shaft; 8, mounting bolt; 9, roller; 10, roller pin; 11, oil hole on the through-pin; 12, oil passage on the rocker arm. DETAILED DESCRIPTION OF THE INVENTION

[0043] In an embodiment of the present application, by providing a rocker arm arrangement structure for a four-valve engine, the problem in the prior art is solved. The existing rocker arm mechanism is mainly applicable to the engines with square valves in the old models, but it is not applicable to the engines with inclined valve layouts after improvement. Due to the inclined valve layout, the driving rocker arms cannot meet their working requirements. Therefore, in the prior art, the method of sharing a rocker arm shaft is mostly adopted. At this time, since the valve positions are different, the rocker arm lengths are different. To ensure that the valves reach the proper positions, the rocker arm shaft needs to be arranged obliquely, which is not good for the machining of the rocker arm shaft holes and the installation of the rocker arm shaft, and the long-term use effect is not good.

[0044] Embodiment 1:

[0045] A rocker arm arrangement structure for a four-valve engine, as Figure 1 - Figure 2 shown, includes an engine cylinder head 1, rocker arm shaft seats 2, a cam drive assembly 3, an intake rocker arm assembly 4, and an exhaust rocker arm assembly 5:

[0046] An installation position is provided on the upper end surface of the engine cylinder head 1; the rocker arm shaft seats 2 are installed on the installation position, and two groups of rocker arm installation positions are provided thereon; the cam drive assembly 3 is installed on the engine cylinder head 1; the intake rocker arm assembly 4 is installed on one group of rocker arm installation positions; the exhaust rocker arm assembly 5 is installed on the other group of rocker arm installation positions;

[0047] Among them, the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 are arranged in parallel. The length of the exhaust rocker arm assembly 5 is longer than that of the intake rocker arm assembly 4. The leverage ratios of the exhaust rocker arm assembly 5 and the intake rocker arm assembly 4 are the same. Two groups of valve assemblies 6 are installed on both the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5.

[0048] Axial positioning surfaces are provided on the lower end surfaces of the exhaust rocker arm assembly 5 and the intake rocker arm assembly 4, which is convenient for installation.

[0049] The two groups of rocker arm installation positions are arranged in a staggered manner, so that the rotation center positions of the exhaust rocker arm assembly 5 and the intake rocker arm assembly 4 are different. Combining with the leverage ratios of the exhaust rocker arm assembly 5 and the intake rocker arm assembly 4, the movement amplitudes of the valve assemblies 6 at different positions can be made the same, thereby ensuring the use effect of the valve assemblies 6.

[0050] During use, the engine drives the cam drive assembly 3 to rotate. The cams on the cam drive assembly 3 contact the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5, and swing with the connection positions of the exhaust rocker arm assembly 5, the intake rocker arm assembly 4, and the rocker arm shaft seats 2 as the center lines, thereby realizing the movement of the valve assemblies 6.

[0051] Embodiment 2

[0052] On the basis of Embodiment 1, as Figure 1 - 9 shown, it further includes the following structure:

[0053] Both the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 include a rocker arm rod body, a rocker arm shaft 7, and mounting bolts 8:

[0054] The rocker arm rod body is laterally provided with a cylindrical connection hole position; the rocker arm shaft 7 is inserted into the connection hole position; the lower end of the mounting bolt 8 penetrates through the rocker arm shaft 7, the rocker arm rod body, and the rocker arm shaft seat 2 and is connected to the engine cylinder head 1. The rocker arm shafts 7 on the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 are arranged in parallel.

[0055] This invention describes a rocker arm arrangement structure for a four-valve engine. Both the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 adopt independent rocker arm shafts, that is, one rocker arm corresponds to one rocker arm shaft, and a special structure of the rocker arm shaft seat 2 is designed to ensure a suitable rocker ratio, and the rocker arm shafts 7 of the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 are staggered and arranged in parallel, making the operation and installation of the rocker arms more convenient, with good use effects and a good application prospect.

[0056] The mounting bolt 8 has a through design, realizing the one-time installation of the rocker arm shaft 7 and the rocker arm shaft seat 2, which is relatively convenient for installation and can improve the installation efficiency of the entire structure.

[0057] The mounting bolt 8 has a through design and is perpendicular to the rocker arm shaft, enabling the rocker arm and the rocker arm shaft to achieve axial positioning through a matching structure.

[0058] A weight-reducing hole is provided at the upper end of the rocker arm rod body away from the rocker arm shaft seat 2, and a roller assembly is installed at one end of the rocker arm rod body away from the valve assembly 6.

[0059] The design of the weight-reducing hole makes one end of the rocker arm rod body lighter, enabling the roller assembly at the other end of the rocker arm rod body to keep in contact with the outer surface of the cam on the cam drive assembly 3.

[0060] The roller assembly includes a roller 9 and a roller pin 10. The roller 9 is rotatably installed on the rocker arm rod body through the roller pin 10, and the outer surfaces of two cams at different positions on the cam drive assembly 3 are respectively in contact with the outer surfaces of the two rollers 9.

[0061] This invention describes a rocker arm arrangement structure for a four-valve engine. A special structure of the rocker arm shaft seat 2 is designed, enabling the two rocker arm shafts 7 to be respectively installed and fixed on the engine cylinder head 1 together with the rocker arm shaft seat 2 through one mounting bolt 8, making the installation of the rocker arm shaft 7 and the rocker arm shaft seat 2 convenient. In addition, the axial positioning between the rocker arm and the rocker arm shaft is achieved through a clever matching structure, making the fixing effect of the rocker arm shaft 7 better and having high stability during use and a good application prospect.

[0062] Embodiment 3

[0063] On the basis of Embodiment 2, as Figure 1 - 11As shown in the figure, this embodiment also records the following structures:

[0064] A roller oil inlet hole is provided on the rocker arm rod body corresponding to the position of the roller 9, a roller pin oil inlet hole is provided on the rocker arm rod body corresponding to one end position of the roller 9, and an elephant foot oil inlet hole is provided on the rocker arm rod body corresponding to the position of the rocker arm shaft 7.

[0065] A nail-passing oil inlet hole 11 is opened at the rocker arm mounting position on the rocker arm shaft seat 2, and the two groups of nail-passing oil inlet holes 11 are connected through a rocker arm oil passage 12.

[0066] One group of the nail-passing oil inlet holes 11 is connected to the oil supply passage on the engine cylinder head 1, and the roller oil inlet hole, the roller pin oil inlet hole, and the elephant foot oil inlet hole are all connected to the nail-passing oil inlet hole 11.

[0067] The lubricating oil in the rocker arm oil passage 12 can enter the nail-passing oil inlet hole 11, and then flow into the roller pin oil inlet hole, the elephant foot oil inlet hole, and the roller oil inlet hole to achieve comprehensive lubrication.

[0068] The present invention records a rocker arm arrangement structure for a four-valve engine, which involves a good oil circuit. It takes the nail-passing oil inlet hole 11 as the center, and other parts are all connected to it. During use, lubricating oil can be directly transported from the engine cylinder head without constructing and connecting the lubricating oil circuit multiple times. The installation is relatively convenient, the use effect is good, and it has a good application prospect.

[0069] The rocker arm mounting position on the rocker arm shaft seat 2 is arc-shaped, which can better cooperate with the rocker arm shaft 7. A positioning pin hole for connecting to the engine cylinder head 1 is opened at the bottom of the rocker arm shaft seat 2, and the positioning pin hole can assist in installing the rocker arm shaft seat 2.

[0070] It should be noted that when this rocker arm arrangement structure for a four-valve engine is in use, the internal structure of the engine drives the cam drive assembly 3 to rotate. The cams on the cam drive assembly 3 contact the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5, and swing with the connection position of the exhaust rocker arm assembly 5, the intake rocker arm assembly 4, and the rocker arm shaft seat 2 as the center line, so as to realize the movement of the valve assembly 6. The contact positions of the cams on the cam drive assembly 3 with the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 are different. Therefore, the intake rocker arm assembly 4 and the exhaust rocker arm assembly 5 operate alternately.

[0071] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A rocker arm arrangement structure for a four-valve engine, characterized in that: include: An engine cylinder head (1) having an upper end surface provided with a mounting position; A rocker arm shaft seat (2) is mounted on a mounting position, and two sets of rocker arm mounting positions are arranged on the rocker arm shaft seat; A cam drive assembly (3) mounted on the engine cylinder head (1); An intake rocker arm assembly (4), which is mounted on one of the rocker arm mounting positions; An exhaust rocker arm assembly (5), which is mounted on another set of rocker arm mounting positions; The intake rocker arm assembly (4) and the exhaust rocker arm assembly (5) are arranged in parallel, the exhaust rocker arm assembly (5) is longer than the intake rocker arm assembly (4), the exhaust rocker arm assembly (5) and the intake rocker arm assembly (4) have the same lever ratio, and two groups of valve assemblies (6) are installed on both the intake rocker arm assembly (4) and the exhaust rocker arm assembly (5).

2. A four-valve engine rocker arm arrangement structure as claimed in claim 1, characterized in that: The intake rocker arm assembly (4) and the exhaust rocker arm assembly (5) both include: The rocker arm body has a cylindrical connection hole on its side; A rocker arm shaft (7) which is inserted into the connecting hole; The lower end of the mounting bolt (8) passes through the rocker shaft (7), the rocker arm body and the rocker shaft seat (2) and is connected to the engine cylinder head (1). The rocker shaft (7) on the intake rocker arm assembly (4) and the rocker shaft (7) on the exhaust rocker arm assembly (5) are arranged in parallel.

3. A four-valve engine rocker arm arrangement structure as claimed in claim 2, characterized in that: A weight-reducing hole is provided at the upper end of the rocker arm body away from the rocker arm shaft seat (2), and a roller assembly is installed at one end of the rocker arm body away from the valve assembly (6).

4. A four-valve engine rocker arm arrangement structure as claimed in claim 3, characterized in that: The roller assembly comprises a roller (9) and a roller pin (10); the roller (9) is rotatably mounted on the rocker arm body via the roller pin (10); and the outer surfaces of two groups of cams at different positions on the cam transmission assembly (3) are respectively in contact with the outer surfaces of the two groups of rollers (9).

5. A four-valve engine rocker arm arrangement structure as claimed in claim 4, characterized in that: A roller oil inlet hole is arranged on the rocker arm body at a position corresponding to the roller (9), a roller pin oil inlet hole is arranged on the rocker arm body at a position corresponding to one end of the roller (9), and an elephant foot oil hole is arranged on the rocker arm body at a position corresponding to the rocker arm shaft (7).

6. A rocker arm arrangement structure for a four-valve engine as claimed in claim 5, characterized in that: The rocker arm mounting position on the rocker arm shaft seat (2) is provided with nail oiling holes (11), and two groups of nail oiling holes (11) are connected via a rocker arm oiling channel (12).

7. A rocker arm arrangement structure for a four-valve engine as claimed in claim 6, characterized in that: One group of the oil holes (11) on the nail is connected to the oil delivery channel on the engine cylinder cover (1), and the roller oil inlet hole, the roller pin oil inlet hole and the oil hole on the elephant foot are all connected to the oil holes (11) on the nail.

8. The rocker arm arrangement structure of a four-valve engine as claimed in claim 1, characterized in that: The rocker arm mounting position on the rocker arm shaft seat (2) is arc-shaped, and a positioning pin hole connected to the engine cylinder cover (1) is provided at the bottom of the rocker arm shaft seat (2).

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