Four-valve cylinder head structure

Abstract

The utility model relates to the technical field of motorcycle parts, in particular to a four-valve cylinder head structure. Comprising an engine top shell, an engine bottom shell, a cam shaft, an air inlet convex hull, an exhaust convex hull and an air inlet and exhaust module, the cam shaft is movably arranged in the engine bottom shell, the outer wall of the cam shaft is sleeved with the air inlet convex hull and the exhaust convex hull, and the air inlet and exhaust module comprises two air inlet valves, two exhaust valves, a first valve rocker arm and a second valve rocker arm; the first valve rocker is movably connected with the engine bottom shell and located in the engine bottom shell, the second valve rocker is movably connected with the engine bottom shell, the air inlet convex hull is movably matched with the first valve rocker, the exhaust convex hull is movably matched with the second valve rocker, and the first valve rocker and the second valve rocker are each provided with two screw parts. The number of the valves of the engine cylinder head is increased, the air inflow of the cylinder head is remarkably improved, and the rotating speed, horsepower and displacement of an engine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle components, in particular to a four-valve cylinder head structure. Background Art

[0002] The cylinder head of a motorcycle engine is one of the important parts of the engine. It is located at the top of the engine. Its main function is to seal the top of the cylinder and form a combustion chamber together with the top of the piston and the cylinder head. The cylinder head is also equipped with intake and exhaust valves, as well as spark plug holes (for gasoline engines) to control the inlet and outlet of gas and ignition. Most existing engine cylinder heads have two valves.

[0003] However, the existing engine cylinder head uses two valves, which will result in lower engine speed and horsepower, and cannot meet the market demand for high-performance racing cars and ordinary daily competitive racing cars. Utility Model Content

[0004] The purpose of the utility model is to provide a four-valve cylinder head structure, aiming to solve the technical problem that the engine cylinder head in the prior art adopts two valves, which leads to low engine speed and horsepower and cannot adapt to the market demand of high-performance racing cars and ordinary daily competitive racing cars.

[0005] To achieve the above-mentioned purpose, the utility model adopts a four-valve cylinder head structure, including an engine top shell, an engine bottom shell, a camshaft, an intake convex bulge, an exhaust convex bulge and an intake and exhaust module, wherein the engine top shell is connected to the engine bottom shell and is located above the engine bottom shell, the camshaft is movably arranged in the engine bottom shell, the intake convex bulge is fixedly connected to the camshaft and sleeved on the outer wall of the camshaft, the exhaust convex bulge is fixedly connected to the camshaft and sleeved on the outer wall of the camshaft, and the intake and exhaust module is arranged in the engine bottom shell and cooperates with the intake convex bulge and the exhaust convex bulge respectively;

[0006] The intake and exhaust module includes two intake valves, two exhaust valves, a first valve rocker arm and a second valve rocker arm. The engine bottom case has an intake port and an exhaust port. The intake port and the exhaust port are arranged on both sides of the engine bottom case. The first valve rocker arm is movably connected to the engine bottom case and is located in the engine bottom case. The second valve rocker arm is movably connected to the engine bottom case and is located in the engine bottom case. The intake bulge is movably matched with the first valve rocker arm, and the exhaust bulge is movably matched with the second valve rocker arm. Two screw parts are arranged on the first valve rocker arm and the second valve rocker arm. The two intake valves and the two exhaust valves are movably arranged in the engine bottom case and movably matched with the corresponding screw parts respectively.

[0007] Among them, the intake and exhaust module also includes two guide wheels, one of which is movably connected to the first valve rocker arm and is located on the first valve rocker arm, and the other guide wheel is movably connected to the second valve rocker arm and is located on the second valve rocker arm, and the intake bulge and the exhaust bulge are respectively movably cooperated with the corresponding guide wheels.

[0008] The engine bottom case further comprises an exhaust sensor mounting hole, and the exhaust sensor mounting hole is used for fixing the exhaust sensor on the engine bottom case.

[0009] Among them, the diameter of the intake port is 40mm, and the diameter of the exhaust port is 32mm.

[0010] Among them, the diameters of the two intake valves are both 24 mm, and the diameters of the two exhaust valves are both 21 mm.

[0011] The utility model discloses a four-valve cylinder head structure, by controlling the rotation of the camshaft, two rocker arms will respectively contact the convex bumps on the camshaft, and will be lifted according to the height of the convex bumps of the camshaft, and at the same time, the screw part of the other end of the rocker arm that contacts the valve will press according to the height of the convex bumps of the camshaft, so that the valve will be pressed by the screw part on the rocker arm to move downward; before improvement, the rocker arm has only one screw part and one intake valve and one exhaust valve, and after improvement, the rocker arm has two screw parts, and there are two intake valves and two exhaust valves in the cylinder head. When the camshaft rotates one circle at the same number of revolutions, the exhaust valve intake and the two exhaust valves exhaust can be controlled. Through the above method, the number of valves in the engine cylinder head is increased, the intake volume of the cylinder head is significantly improved, the speed, horsepower and displacement of the engine are improved, and the market demand for high-performance racing cars and ordinary daily competitive racing cars is met. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of a four-valve cylinder head structure of the utility model.

[0014] Figure 2 It is a structural bottom view of the four-valve cylinder head structure of the utility model.

[0015] Figure 3 It is a schematic diagram of the internal structure of the engine bottom shell of the four-valve cylinder head structure of the utility model.

[0016] Figure 4 It is a partial structural schematic right view of the four-valve cylinder head structure of the utility model.

[0017] Figure 5 It is a partial structural schematic left view of the four-valve cylinder head structure of the utility model.

[0018] Figure 6 It is a partial structural schematic diagram of the four-valve cylinder head structure of the utility model.

[0019] 101-engine top case, 102-engine bottom case, 103-camshaft, 104-intake cam, 105-exhaust cam, 106-intake valve, 107-exhaust valve, 108-first valve rocker arm, 109-second valve rocker arm, 110-guide wheel, 111-intake port, 112-exhaust port, 113-screw part, 114-exhaust sensor mounting hole. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] See also Figure 1 to Figure 6 The utility model provides a four-valve cylinder head structure, including an engine top shell 101, an engine bottom shell 102, a camshaft 103, an intake convex bulge 104, an exhaust convex bulge 105 and an intake and exhaust module, wherein the engine top shell 101 is connected to the engine bottom shell 102 and is located above the engine bottom shell 102, the camshaft 103 is movably arranged in the engine bottom shell 102, the intake convex bulge 104 is fixedly connected to the camshaft 103 and sleeved on the outer wall of the camshaft 103, the exhaust convex bulge 105 is fixedly connected to the camshaft 103 and sleeved on the outer wall of the camshaft 103, the intake and exhaust module is arranged in the engine bottom shell 102, and respectively cooperates with the intake convex bulge 104 and the exhaust convex bulge 105;

[0022] The intake and exhaust module includes two intake valves 106, two exhaust valves 107, a first valve rocker arm 108 and a second valve rocker arm 109. The engine bottom case 102 has an intake port 111 and an exhaust port 112. The intake port 111 and the exhaust port 112 are arranged on both sides of the engine bottom case 102. The first valve rocker arm 108 is movably connected to the engine bottom case 102 and is located in the engine bottom case 102. The second valve rocker arm 109 is movably connected to the engine bottom case 102 and is located in the engine bottom case 102. The shell 102 is movably connected and is located in the engine bottom shell 102, the intake bulge 104 is movably matched with the first valve rocker arm 108, the exhaust bulge 105 is movably matched with the second valve rocker arm 109, the first valve rocker arm 108 and the second valve rocker arm 109 are each provided with two screw portions 113, the two intake valves 106 and the two exhaust valves 107 are both movably set in the engine bottom shell 102, and are movably matched with the corresponding screw portions 113 respectively.

[0023] In this embodiment, by controlling the rotation of the camshaft 103, the two rocker arms will respectively contact the convex bulges on the camshaft 103, and will be lifted according to the height of the convex bulge of the camshaft 103. At the same time, the screw portion 113 at the other end of the rocker arm that contacts the valve will press according to the height of the convex bulge of the camshaft 103, so that the valve will be pressed by the screw portion 113 on the rocker arm to move downward.

[0024] The camshaft 103 is provided with the intake bulge 104 and the exhaust bulge 105, the height curve of the intake bulge 104 is related to the opening and closing time of the intake valve 106, and the valve lifting height, that is, the intake volume, the height curve of the exhaust bulge 105 is related to the opening and closing time of the exhaust valve 107, and the exhaust volume of the exhaust valve 107. When the camshaft 103 rotates one circle, the camshaft 103 will first drive the intake bulge 104 to contact and squeeze the first valve rocker arm 108, and then drive the exhaust bulge 105 to contact and squeeze the second valve rocker arm 109. During this period, the two intake valves 106 will be opened first, and the mixed gas of air and fuel gas will enter. The intake valve 106 is closed, and the mixed gas of air and fuel gas is ignited. The latter two The exhaust valve 107 is opened, and the post-combustion gas is discharged, and finally the two exhaust valves 107 are closed. This is when the camshaft 103 rotates one circle, and the engine cylinder head completes a working cycle. Among them, by improving the cylinder head to have two intake valves 106 and two exhaust valves 107, there is one more intake and exhaust valve than before the improvement. After the improvement, one rotation of the camshaft 103 will open and close the two intake valves 106, and the two exhaust valves 107 will open and close. In this way, the intake volume after the improvement will be significantly more than before the improvement, and the exhaust volume after the improvement will also be significantly increased. Through the above method, the number of valves in the engine cylinder head is increased, the intake volume of the cylinder head is significantly improved, the engine speed, horsepower and displacement are improved, and the market demand for high-performance racing cars and ordinary daily competitive racing cars is met.

[0025] Furthermore, the intake and exhaust module also includes two guide wheels 110, one of which is movably connected to the first valve rocker arm 108 and is located on the first valve rocker arm 108, and the other guide wheel 110 is movably connected to the second valve rocker arm 109 and is located on the second valve rocker arm 109, and the intake bulge 104 and the exhaust bulge 105 are movably cooperated with the corresponding guide wheels 110 respectively.

[0026] In this embodiment, the guide wheel 110 is respectively provided on the first valve rocker arm 108 and the second valve rocker arm 109. When the camshaft 103 rotates, the convex bump on the camshaft 103 will first cooperate with the guide wheel 110, and then the guide wheel 110 will be squeezed to drive the rocker arm to move in the engine bottom case 102, thereby improving flexibility.

[0027] Furthermore, the engine bottom case 102 also has an exhaust gas sensor mounting hole 114 , and the exhaust gas sensor mounting hole 114 is used to fix the exhaust gas sensor on the engine bottom case 102 .

[0028] In this embodiment, the exhaust gas sensor is fixed on the engine bottom case 102 through the exhaust gas sensor mounting hole 114 , and the exhaust gas sensor can monitor the exhaust gas volume at the exhaust port 112 .

[0029] Furthermore, the diameter of the intake port 111 is 40 mm, and the diameter of the exhaust port 112 is 32 mm; the diameters of the two intake valves 106 are both 24 mm, and the diameters of the two exhaust valves 107 are both 21 mm.

[0030] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the utility model.

Claims

1. A four-valve cylinder head structure, characterized in that: The invention comprises an engine top shell, an engine bottom shell, a camshaft, an intake convex bulge, an exhaust convex bulge and an intake and exhaust module, wherein the engine top shell is connected to the engine bottom shell and is located above the engine bottom shell, the camshaft is movably arranged in the engine bottom shell, the intake convex bulge is fixedly connected to the camshaft and sleeved on the outer wall of the camshaft, the exhaust convex bulge is fixedly connected to the camshaft and sleeved on the outer wall of the camshaft, and the intake and exhaust module is arranged in the engine bottom shell and cooperates with the intake convex bulge and the exhaust convex bulge respectively; The intake and exhaust module includes two intake valves, two exhaust valves, a first valve rocker arm and a second valve rocker arm. The engine bottom case has an intake port and an exhaust port. The intake port and the exhaust port are arranged on both sides of the engine bottom case. The first valve rocker arm is movably connected to the engine bottom case and is located in the engine bottom case. The second valve rocker arm is movably connected to the engine bottom case and is located in the engine bottom case. The intake bulge is movably matched with the first valve rocker arm, and the exhaust bulge is movably matched with the second valve rocker arm. Two screw parts are arranged on the first valve rocker arm and the second valve rocker arm. The two intake valves and the two exhaust valves are movably arranged in the engine bottom case and movably matched with the corresponding screw parts respectively.

2. The four-valve cylinder head structure according to claim 1, characterized in that: The intake and exhaust module also includes two guide wheels, one of which is movably connected to the first valve rocker arm and is located on the first valve rocker arm, and the other guide wheel is movably connected to the second valve rocker arm and is located on the second valve rocker arm, and the intake bulge and the exhaust bulge are respectively movably matched with the corresponding guide wheels.

3. The four-valve cylinder head structure according to claim 1, characterized in that: The engine bottom case also has an exhaust gas sensor mounting hole, and the exhaust gas sensor mounting hole is used to fix the exhaust gas sensor on the engine bottom case.

4. The four-valve cylinder head structure according to claim 1, characterized in that: The diameter of the air inlet port is 40 mm, and the diameter of the exhaust port is 32 mm.

5. The four-valve cylinder head structure according to claim 1, characterized in that: The diameters of the two intake valves are both 24 mm, and the diameters of the two exhaust valves are both 21 mm.

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