An internal combustion engine cylinder head valve body opening and closing mechanism

Abstract

This invention discloses a valve body opening and closing mechanism for an internal combustion engine cylinder head, comprising a camshaft and two valve body assemblies. Two valve opening cams and two valve closing cams are arranged radially on the camshaft. Each valve body assembly includes an opening rocker arm, a closing rocker arm, and at least one valve body. Both the opening and closing rocker arms are rotatably mounted on the cylinder head. A valve lifter is mounted on the valve body, and a valve tappet is connected to the top of the valve body. One end of the opening rocker arm is connected to the valve tappet, and the other end engages with one of the opening cams. One end of the closing rocker arm contacts the bottom of the valve lifter, and the other end engages with one of the closing cams. This structure overcomes the problems of untimely closing and mixture vibration and leakage inherent in existing spring-return mechanisms.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, and more specifically to an opening and closing mechanism for the cylinder head valve body of an internal combustion engine. Background Technology

[0002] The existing cylinder head structure of motorcycle internal combustion engines has valve bodies that are opened by camshaft drive and closed by spring force. However, the valve body closure cannot be precisely controlled, which may cause the engine cylinder piston to collide with the valve body due to valve body lag or untimely closure, resulting in malfunctions, especially when the engine speed is too high.

[0003] Even if a spring with greater elasticity can drive the valve body to return to its original position in a timely manner, the resistance on the camshaft acting on the camshaft when driving the valve body to open will also increase. Furthermore, due to the characteristics of the spring, uncontrollable vibrations can occur after the valve body closes, leading to leakage of the air-fuel mixture in the cylinder and a decrease in engine performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an opening and closing mechanism for the cylinder head valve body of an internal combustion engine, overcoming problems such as untimely closing and mixture vibration and leakage in existing spring reset methods.

[0005] An internal combustion engine cylinder head valve body opening and closing mechanism includes a camshaft and two valve body assemblies, with two valve opening cams and two valve closing cams arranged radially on the camshaft.

[0006] The valve body assembly includes an opening rocker arm, a closing rocker arm, and at least one valve body. Both the opening and closing rocker arms are rotatably mounted on the cylinder head. A valve top cup is mounted on the valve body, and a valve stem is connected to the top of the valve body.

[0007] One end of the valve rocker arm is connected to the valve tappet, and the other end of the valve rocker arm engages with one of the valve opening cams.

[0008] One end of the valve rocker arm contacts the bottom of the valve cup, and the other end of the valve rocker arm engages with one of the valve closing cams.

[0009] When the camshaft rotates once, the two valve opening cams can alternately drive the two valve opening rocker arms to move, which in turn causes the valve bodies in the two valve body assemblies to move alternately to open the valve. The two valve closing cams can alternately drive the two valve closing rocker arms to move, which in turn causes the valve bodies in the two valve body assemblies to move alternately to close the valve.

[0010] Preferably, the valve cup includes a cup body, a cup base, a cup nut, and a valve lock clip. The cup base is a hollow structure with external threads. The valve lock clip is fixed to the inner wall of the cup base and is fixed to the valve body. The cup body and the cup nut are threaded to the cup base. The valve closing rocker arm is in contact with the bottom of the cup body.

[0011] Preferably, the valve body has a groove, and the valve lock clip has a flange, which is embedded in the groove.

[0012] Preferably, the valve lock clamp abuts against the inner wall of the top cup base.

[0013] Preferably, the inner diameter of the top cup base gradually decreases from top to bottom, and the outer wall of the valve lock clamp cooperates with the inner wall of the top cup base.

[0014] Preferably, the valve body assembly has two valve bodies distributed in the front-rear direction.

[0015] Preferably, the valve opening rocker arm has two valve opening rocker arm forks, and the two valve opening rocker arm forks are respectively connected to the valve top posts on the two valve bodies.

[0016] Preferably, the valve rocker arm has two valve rocker arm forks, and the two valve rocker arm forks respectively contact the bottom of the valve cups on the two valve bodies.

[0017] Preferably, the valve opening rocker arm is mounted on the valve opening rocker arm shaft, the valve closing rocker arm is mounted on the valve closing rocker arm shaft, and both the valve opening rocker arm shaft and the valve closing rocker arm shaft are rotatably mounted on the cylinder head.

[0018] Preferably, the valve top post is an elastic column.

[0019] The beneficial effects of this invention are reflected in:

[0020] By using a valve closing cam and a valve closing rocker arm to drive the valve body to close, replacing the traditional spring return, precise control of the valve closing moment is achieved, avoiding valve impact failure caused by spring hysteresis.

[0021] The valve closing action is precisely controlled by the valve closing cam, eliminating uncontrollable vibrations after the spring closes, effectively reducing air-fuel mixture leakage, improving engine combustion efficiency and performance, and reducing emissions.

[0022] The valve top cup adopts a threaded connection structure, and the fit clearance between the valve rocker arm and the valve cam can be adjusted by rotating the main body of the top cup, which facilitates assembly and wear compensation. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the split-opening valve rocker arm disassembly structure;

[0026] Figure 3 for Figure 2 A schematic diagram of the disassembly of the camshaft;

[0027] Figure 4 This is a schematic diagram of the overall structure of the valve body with valve top cup installed in this invention;

[0028] Figure 5 A schematic diagram of the overall structure of the valve body in this invention;

[0029] Figure 6 A schematic diagram of the structure of the valve lock clip and the valve body in this invention;

[0030] Figure 7 This is a cross-sectional view of the valve top cup in this invention.

[0031] In the attached diagram, 1-camshaft, 2-opening cam, 3-closing cam, 4-valve body, 5-opening rocker arm, 6-closing rocker arm, 7-valve crown, 8-valve pushrod, 9-groove.

[0032] 51 - Open valve rocker arm bifurcated, 61 - Close valve rocker arm bifurcated

[0033] 71-Top cup body, 72-Top cup base, 73-Top cup nut, 74-Valve lock clip, 75-Flange. Detailed Implementation

[0034] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0035] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0036] Example 1

[0037] like Figures 1-7 As shown, this embodiment provides a cylinder head valve body opening and closing mechanism for an internal combustion engine, characterized in that it includes a camshaft 1 and two valve body assemblies, the two valve body assemblies being symmetrically arranged about the camshaft 1, and two valve opening cams 2 and two valve closing cams 3 being arranged radially on the camshaft 1.

[0038] The valve body assembly includes an opening rocker arm 5, a closing rocker arm 6, and at least one valve body 4. The opening rocker arm 5 and the closing rocker arm 6 are both rotatably mounted on the cylinder head. A valve cup 7 is mounted on the valve body 4, and a valve stem 8 is connected to the top of the valve body 4.

[0039] One end of the valve rocker arm 5 is connected to the valve stem 8, and the other end of the valve rocker arm 5 is engaged with one of the valve cams 2.

[0040] One end of the valve rocker arm 6 contacts the bottom of the valve cup 7, and the other end of the valve rocker arm 6 engages with one of the valve closing cams 3.

[0041] When the camshaft 1 rotates one revolution, the two valve opening cams 2 can alternately drive the two valve opening rocker arms 5 to move, thereby causing the valve bodies 4 in the two valve body assemblies to move alternately to open the valve. The two valve closing cams 3 can alternately drive the two valve closing rocker arms 6 to move, thereby causing the valve bodies 4 in the two valve body assemblies to move alternately to close the valve. When the valve body 4 in one valve body assembly opens the valve, the valve body 4 in the other valve body assembly closes the valve.

[0042] The specific working principle is as follows: Camshaft 1 is rotated and mounted on the cylinder head. Two valve body assemblies control the intake and exhaust respectively. For example, the left valve body assembly controls the intake and the right valve body assembly controls the exhaust.

[0043] During intake, the intake valve opens, and the camshaft 1 rotates, causing the corresponding valve opening cam 2 to rotate. This cam 2 engages with the right end of the valve opening rocker arm 5 inside the left valve body assembly. The right end of the left valve opening rocker arm 5 moves upward and the left end moves downward, causing the left valve body 4 to move downward and open the intake valve.

[0044] When the intake valve is closed, the camshaft 1 rotates, causing the corresponding valve closing cam 3 to rotate. The valve closing cam 3 cooperates with the valve closing rocker arm 6. The right end of the left valve closing rocker arm 6 moves downward and the left end moves upward, pushing the valve cup 7 upward, which in turn causes the left valve body 4 to move upward and close the intake valve.

[0045] The principle is the same when the right valve body assembly controls the exhaust.

[0046] Thus, this device forcibly drives the valve body 4 to close via the valve-closing cam 3 and the valve-closing rocker arm 6, replacing the traditional spring return mechanism. This achieves precise control of the valve closing moment, avoiding valve-piston impact failure caused by spring lag. Furthermore, the valve closing action is precisely controlled by the valve-closing cam 3, eliminating uncontrollable vibrations after spring closure, effectively reducing air-fuel mixture leakage, improving engine combustion efficiency and performance, and simultaneously reducing emissions.

[0047] In this embodiment, the valve cup 7 includes a cup body 71, a cup base 72, a cup nut 73, and a valve lock clip 74. The cup base 72 is a hollow structure with external threads. The valve lock clip 74 is fixed to the inner wall of the cup base 72. The valve lock clip 74 is fixed to the valve body 4. The cup body 71 and the cup nut 73 are both threaded to the cup base 72. The valve rocker arm 6 is in contact with the bottom of the cup body 71.

[0048] Specifically, in this structure, the valve lock clip 74 is fixed inside the top cup base 72, and the valve lock clip 74 is fixed on the valve body 4 to realize the connection between the top cup base 72 and the valve body 4. The top cup body 71 and the top cup nut 73 are both threadedly connected to the top cup base 72, and the height of the top cup body 71 can be adjusted, thereby adjusting the gap between the valve rocker arm 6 and the valve cam 3, which facilitates assembly and wear compensation.

[0049] In this embodiment, the valve body 4 has a groove 9, and the valve lock clip 74 has a flange 75, which is embedded in the groove 9.

[0050] Specifically, in this embodiment, the valve lock clip 74 has a flange 75, which is embedded in the groove 9 to achieve the positioning connection between the valve lock clip 74 and the valve body 4.

[0051] In this embodiment, the valve lock clip 74 is pressed against the inner wall of the top cup base 72.

[0052] In this embodiment, the inner diameter of the top cup base 72 gradually decreases from top to bottom, and the outer wall of the valve lock clip 74 cooperates with the inner wall of the top cup base 72.

[0053] Specifically, the outer wall of the valve lock clip 74 and the inner wall of the top cup base 72 are fitted with a conical surface to achieve a tight and fixed effect.

[0054] In this embodiment, the valve body assembly has two valve bodies 4 distributed along the front-to-back direction.

[0055] In this embodiment, the valve opening rocker arm 5 has two valve opening rocker arm forks 51, and the two valve opening rocker arm forks 51 are respectively connected to the valve top posts 8 on the two valve bodies 4.

[0056] In this embodiment, the valve rocker arm 6 has two valve rocker arm forks 61, and the two valve rocker arm forks 61 respectively contact the bottom of the valve cups 7 on the two valve bodies 4.

[0057] Specifically, this embodiment employs a four-valve layout. Furthermore, a rocker arm drives the movement of two valve bodies 4 within the valve body assembly, resulting in a more compact structure that is easier to arrange within the limited space of a motorcycle, while also providing a centrally located mounting position for the spark plug.

[0058] In this embodiment, the valve opening rocker arm 5 is mounted on the valve opening rocker arm shaft, and the valve closing rocker arm 6 is mounted on the valve closing rocker arm shaft. Both the valve opening rocker arm shaft and the valve closing rocker arm shaft are rotatably mounted on the cylinder head.

[0059] Specifically, the valve opening rocker arm shaft and the valve closing rocker arm shaft are rotatably mounted on the cylinder head. The valve opening rocker arm 5 and the valve closing rocker arm 6 are mounted on the valve opening rocker arm shaft and the valve closing rocker arm shaft, thereby achieving the rotatable setting of the valve opening rocker arm 5 and the valve closing rocker arm 6. Furthermore, a torsion spring is installed on the valve closing rocker arm shaft to ensure that the valve closing rocker arm 6 always maintains contact with the valve top cup 7.

[0060] In this embodiment, the valve top pillar 8 is an elastic pillar. This elasticity is designed to accommodate deformation requirements during operation.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A valve body opening and closing mechanism for an internal combustion engine cylinder head, characterized in that: It includes a camshaft (1) and two valve body assemblies, with two valve opening cams (2) and two valve closing cams (3) arranged radially on the camshaft (1). The valve body assembly includes an opening rocker arm (5), a closing rocker arm (6), and at least one valve body (4). The opening rocker arm (5) and the closing rocker arm (6) are rotatably mounted on the cylinder head. A valve cup (7) is installed on the valve body (4), and a valve stem (8) is connected to the top of the valve body (4). One end of the valve rocker arm (5) is connected to the valve top column (8), and the other end of the valve rocker arm (5) is engaged with one of the valve opening cams (2). One end of the valve rocker arm (6) contacts the bottom of the valve cup (7), and the other end of the valve rocker arm (6) engages with one of the valve cams (3). When the camshaft (1) rotates one revolution, the two valve opening cams (2) can alternately drive the two valve opening rocker arms (5) to move, thereby causing the valve bodies (4) in the two valve body assemblies to move alternately to open the valve. The two valve closing cams (3) can alternately drive the two valve closing rocker arms (6) to move, thereby causing the valve bodies (4) in the two valve body assemblies to move alternately to close the valve.

2. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 1, characterized in that, The valve cup (7) includes a cup body (71), a cup base (72), a cup nut (73), and a valve lock clip (74). The cup base (72) is a hollow structure with external threads. The valve lock clip (74) is fixed to the inner wall of the cup base (72). The valve lock clip (74) is fixed to the valve body (4). The cup body (71) and the cup nut (73) are both threaded to the cup base (72). The valve rocker arm (6) contacts the bottom of the cup body (71).

3. The cylinder head valve body opening and closing mechanism for an internal combustion engine according to claim 2, characterized in that, The valve body (4) has a groove (9), and the valve lock clip (74) has a flange (75), which is embedded in the groove (9).

4. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 3, characterized in that, The valve lock clip (74) abuts against the inner wall of the top cup base (72).

5. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 4, characterized in that, The inner diameter of the top cup base (72) gradually decreases from top to bottom, and the outer wall of the valve lock clip (74) cooperates with the inner wall of the top cup base (72).

6. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 1, characterized in that, The valve body assembly has two valve bodies (4) distributed in the front-rear direction.

7. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 6, characterized in that, The valve rocker arm (5) has two valve rocker arm forks (51), and the two valve rocker arm forks (51) are respectively connected to the valve top posts (8) on the two valve bodies (4).

8. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 6, characterized in that, The valve rocker arm (6) has two valve rocker arm forks (61), and the two valve rocker arm forks (61) respectively contact the bottom of the valve cups (7) on the two valve bodies (4).

9. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 1, characterized in that, The valve opening rocker arm (5) is mounted on the valve opening rocker arm shaft, and the valve closing rocker arm (6) is mounted on the valve closing rocker arm shaft. Both the valve opening rocker arm shaft and the valve closing rocker arm shaft are rotatably mounted on the cylinder head.

10. The cylinder head valve body opening and closing mechanism of an internal combustion engine according to claim 1, characterized in that, The valve top column (8) is an elastic column.

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