WO2012122846A1

WO2012122846A1 - Gasoline engine inclined valve cylinder head and gasoline engine therewith

Info

Publication number: WO2012122846A1
Application number: PCT/CN2011/084765
Authority: WO
Inventors: 刘兵; 谢育明; 陈宏波
Original assignee: 隆鑫通用动力股份有限公司
Priority date: 2011-03-14
Filing date: 2011-12-27
Publication date: 2012-09-20
Also published as: CN102305126A

Abstract

Disclosed is a gasoline engine inclined valve cylinder head, which comprises a cylinder head body (1), and an intake passage (3), an exhaust passage (2) and a spark plug installation hole (6) arranged within the cylinder head body (1). On the outer surface of the cylinder head body (1) there are provided cooling fans (4), at the inner side of the cylinder head body (1) there is formed a combustion chamber face (5), on the cylinder head body (1) there are provided an intake valve (31) and an exhaust valve (21), with the intake valve (31) inclined towards the intake passage (3) from the bottom to the top, the exhaust valve (21) inclined towards the exhaust passage (2) from the bottom to the top, and the axis of the intake valve (31) and the axis of the exhaust valve (21) are respectively perpendicular to the tangent planes at the points where the combustion chamber face (5) intersects with the respective axis. Also disclosed is a gasoline engine with the inclined valve cylinder head. The gasoline engine inclined valve cylinder head facilitates the organization of the intake air, the improvement of the intake efficiency, the increase of air flow turbulence within the cylinder, and the acceleration of the combustion, so as to improve the power of the gasoline engine.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of power machinery, and more particularly to a gasoline engine tilt valve head and a gasoline engine thereof. BACKGROUND OF THE INVENTION A gasoline engine is a power machine that uses gasoline as a fuel. It consists of a cylinder, a crank-link mechanism, a gas distribution system, a fuel supply system, a lubrication system, and an ignition system. The cylinder head is provided with an intake passage and an exhaust passage, and together with the cylinder constitute a combustion chamber surface, and thus, it is a relatively important component of the gasoline engine. The valve assembly is an important component on the cylinder head for providing a gas mixture to the combustion chamber and exhausting the exhaust gas. The valve of the valve assembly is disposed at the cylinder head for opening and closing the connection between the intake and exhaust passages and the combustion chamber. In the prior art, the valve setting mainly considers the convenience of the arrangement of the cylinder head, generally perpendicular to the intake passage and the exhaust passage, increases the intake and exhaust resistance and affects the efficiency of intake and exhaust; thereby affecting the fullness of the mixed gas in the combustion chamber. Combustion, reducing the efficiency of gasoline engines and affecting emissions. Therefore, it is necessary to improve the valve assembly of the gasoline engine cylinder head, reduce the intake and exhaust resistance, improve the operating efficiency of the gasoline engine, save fuel, and reduce emissions; at the same time, it has better adaptability for installation of other components on the cylinder head. SUMMARY OF THE INVENTION In view of the above, the present invention provides a gasoline engine inclined valve cylinder head and a gasoline engine thereof, which reduces intake and exhaust resistance, improves the operating efficiency of the gasoline engine, saves fuel, and reduces emissions; meanwhile, for other components on the cylinder head The installation has better adaptability. The gasoline engine tilting valve cylinder head of the present invention comprises a cylinder head body and an intake passage, an exhaust passage and a spark plug mounting hole disposed on the cylinder head body, wherein a heat sink is disposed on the outer surface of the cylinder head body, and a combustion chamber is formed inside the cylinder head body In the cylinder head body, an intake valve is arranged corresponding to the intake passage, and an exhaust valve is arranged corresponding to the exhaust passage, and the intake valve is inclined from the bottom to the top toward the intake passage side, and the exhaust valve is from bottom to top. The exhaust passage side is inclined; the intake valve axis and the exhaust valve axis are perpendicular to the tangent plane of the combustion chamber face and the respective intersection points. Further, the inner end of the race of the intake valve and the inner end of the race of the exhaust valve are adapted to the shape of the combustion chamber surface. The shape of the end face of the inner end of the race of the valve and the inner end of the race of the exhaust valve is adapted to the shape of the face of the combustion chamber. Eliminate the steps, reduce the interference to the intake and exhaust, reduce the resistance, eliminate dead ends and sudden changes in shape, ensure the full combustion of the mixed gas, and improve the efficiency of the gasoline engine. Further, a portion of the combustion chamber surface between the intake valve and the exhaust valve forms a nose bridge region, and a width of the nose bridge portion on the combustion chamber surface is greater than 8 mm. Appropriately increase the thickness of the nose bridge area, increase its ability to resist thermal deformation, effectively improve the valve sealing performance, and effectively avoid the air leakage phenomenon of the valve; at the same time, avoid the instantaneous interference between the intake and exhaust, ensure full combustion, and improve the gasoline engine. power. Further, the intake passage axis and the exhaust passage axis are coplanar. The intake passage axis and the exhaust passage axis are in the same plane, facilitating the arrangement of the valve and the rocker arm. Further, the angle between the intake valve and the exhaust valve and the vertical center line of the combustion chamber surface is 22.5°, respectively, and the intake passage and the exhaust passage are respectively inclined from the inside to the outside with respect to the mounting surface of the cylinder head body. Further reduce the angle between the intake and exhaust valves and the intake and exhaust passages, reduce the intake and exhaust resistance, and at the same time facilitate the arrangement of the intake and exhaust passages. Further, the outer circumference of the outer circumference of the intake valve and the outer circumference of the outer circumference of the exhaust valve are tangent to the bottom edge of the combustion chamber surface. Increase the distance between the intake and exhaust valves, and adapt to the intake and exhaust flow lines, so that the intake and exhaust do not interfere with each other, and ensure the power and economy of the gasoline engine. Further, a rocker arm is respectively arranged corresponding to the intake valve and the exhaust valve, and a rocker arm seat is arranged on the cylinder head body corresponding to the corresponding rocker arm, and the rocker arm is fixedly provided with a corresponding rocker arm shaft, and the rocker arm shaft can be wound around The single degree of freedom of the rotation of the own axis is set to the corresponding rocker arm seat, and the two rocker arm shafts are inclined in the radial direction inwardly with respect to the cylinder head body mounting surface, and the tilt angle of the rocker arm shaft with respect to the cylinder head body mounting surface The inclination angles respectively corresponding to the vertical centerlines of the intake and exhaust valves with respect to the combustion chamber surface are the same; the rocker arms form a lever structure with the corresponding rocker arm shaft as a fulcrum. The inclined rocker shaft can be adapted to the inclined valve structure and adapt to the geometry of the composite spherical combustion chamber, which is beneficial to ensure the coordination and sealing of the rocker to move the valve. During the operation of the fixed rocker arm, its various directions The amount of swaying or shaking is small, which can effectively reduce the failure rate of the rocker arm and reduce the maintenance cost. It is suitable for the position of the intake and exhaust to properly arrange the rocker arm, which is also beneficial to ensure the valve timing and ensure the phase of the valve distribution, thereby improving Performance and reduced emissions. Further, the rocker arm seat has an upward opening structure, and both ends of the rocker arm shaft are correspondingly inserted into the sides of the opening of the rocker arm seat and are coupled to rotate around the axis thereof, and the rocker arm is fixedly disposed in the opening of the corresponding rocker arm seat. The corresponding rocker shaft; the outward side of the rocker seat opening structure is a split bearing housing structure, including a gland and a seat body, and a detachable fixed connection between the gland and the seat body. The split bearing housing structure facilitates the installation of the rocker shaft, reduces the friction area, increases the flexibility of the rocker arm movement, and is simple and compact in structure, saving space. The invention also discloses a gasoline engine having the foregoing gasoline engine inclined valve cylinder head, wherein the gasoline engine inclined valve cylinder head is installed on the gasoline engine. Advantageous Effects of Invention: The gasoline engine tilt valve head of the present invention and the gasoline engine thereof, because the valve is inclined, and the intake valve axis and the exhaust valve axis are perpendicular to the section of the combustion chamber surface and the intersection thereof, respectively, intake and exhaust The angle between the door and the intake and exhaust air passages is smaller than that of the existing structure combustion chamber surface, which facilitates the organization of the intake air, improves the intake efficiency, facilitates the organization of the intake and intake vortex in the cylinder, and increases the in-cylinder airflow. Disturb, speed up combustion, increase gasoline engine power. The inlet and exhaust valves are adapted to the direction of the intake and exhaust of the combustion chamber, which is beneficial to reducing the resistance to a large extent, improving the efficiency of the gasoline engine, increasing the power of the gasoline engine, making the intake and exhaust more smooth, and improving the power of the gasoline engine. Fuel consumption, reducing emissions and protecting the environment. For example, a gasoline engine with a maximum power (3060 rpm) of 7.5 kW can increase the power to 8.0 kW, and the emission is reduced from 8.0 g/kW.h to 6.0 g/kW.h, which meets and exceeds the EPA3 stage of 8 g/kW.h. . It can be seen that the power increase and emission reduction of the gasoline engine of the present invention are more obvious. The inclined valve can make the nose bridge area in the middle of the inlet and exhaust passages wider, which is conducive to cooling, increases the resistance to deformation, greatly improves the cooling effect of the nose beam region, reduces the deformation of the cylinder head at high temperatures, and improves reliability. Sex. The cylinder head of the invention is used for ordinary general machinery, which saves energy and reduces consumption. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be further described below in conjunction with the drawings and embodiments. 1 is a schematic cross-sectional view of the present invention; FIG. 2 is a perspective view of the present invention; FIG. 3 is a cross-sectional view of the rocker arm shaft and the rocker arm seat. 1 is a schematic cross-sectional view of the present invention, FIG. 2 is a perspective view of the present invention, and FIG. 3 is a cross-sectional view of a rocker arm shaft and a rocker arm seat. As shown in the figure: the gasoline engine tilting valve cylinder head of the embodiment includes a cylinder head body 1 and an intake passage 3, an exhaust passage 2 and a spark plug mounting hole 6 provided in the cylinder head body 1, and an outer surface of the cylinder head body 1 A heat sink 4 is disposed, and a combustion chamber surface 5 is formed on the inner side of the cylinder head body 1. An intake valve 31 is disposed on the cylinder head body 1 corresponding to the intake passage 3, and an exhaust valve 21 is provided corresponding to the exhaust passage 2, and the intake air is provided. The door 31 is inclined from the bottom to the top toward the intake passage 3 side, and the exhaust valve 21 is inclined from the bottom to the top toward the exhaust passage 2 side; the intake valve 31 axis and the exhaust valve 21 axis are perpendicular to the combustion chamber surface 5, respectively. The cut surface of the point, that is, the cut surface at the intersection of the axis of the intake valve 31 and the axis of the exhaust valve 21, respectively, intersects the combustion chamber face 5. The above structure is adapted to the direction of the intake and exhaust of the combustion chamber, reducing the resistance and increasing the power of the gasoline engine. In the present embodiment, the inner end portion of the race 31a of the intake valve 31 and the inner end portion of the race 21a of the exhaust valve 21 are conformed to the combustion chamber face 5. The conformal shape is adapted to the shape, and the shape of the end surface of the inner end of the seat ring of the intake valve and the inner end of the seat ring of the exhaust valve is adapted to the shape of the combustion chamber surface, eliminating steps and reducing interference with intake air and exhaust gas. Reduce the resistance, eliminate dead ends and sudden changes in shape, ensure the full combustion of the mixed gas, and improve the efficiency of the gasoline engine. In the present embodiment, the portion of the combustion chamber face 5 between the intake valve 31 and the exhaust valve 21 forms a nose bridge region. As shown in Fig. 1, the width L of the nose bridge region at the combustion chamber face 5 is greater than 8 mm. Appropriately increase the thickness of the nose bridge area, increase its ability to resist thermal deformation, effectively improve the valve sealing performance, and effectively avoid the air leakage phenomenon of the valve; at the same time, avoid the instantaneous interference between the intake and exhaust, ensure full combustion, and improve the gasoline engine. Power; In this embodiment, the axis of the intake passage 3 and the axis of the exhaust passage 2 are coplanar. The intake passage axis and the exhaust passage axis are in the same plane, facilitating the arrangement of the valve and the rocker arm. In this embodiment, the angle between the intake valve 31 and the exhaust valve 21 and the vertical center line of the combustion chamber surface 5 is 22.5°, respectively, and the intake passage 3 and the exhaust passage 2 are installed from the inside to the outside with respect to the cylinder head body 1, respectively. Tilt to the top. Further reduce the angle between the intake and exhaust valves and the intake and exhaust passages, reduce the intake and exhaust resistance, and at the same time facilitate the arrangement of the intake and exhaust passages. In the present embodiment, the outer circumference of the race 31a of the intake valve 31 and the outer circumference of the race 21a of the exhaust valve 21 and the combustion chamber surface

5 The bottom edge is tangent. The distance between the intake valve 31 and the exhaust valve 21 is increased, and both are adapted to the intake and exhaust flow lines, so that the intake and exhaust gases do not interfere with each other, and the power and economy of the gasoline engine are ensured. In this embodiment, the intake valve 31 and the exhaust valve 21 are respectively provided with rocker arms, as shown in the figure: the rocker arm 11 of the intake valve 31, the rocker arm 13 of the exhaust valve 21; the cylinder head body 1 and the rocker The arm (the rocker arm 11 and the rocker arm 13) is correspondingly provided with a rocker arm seat (the rocker arm seat 8 and the rocker arm seat 12), and the rocker arm (the rocker arm 11 and the rocker arm 13) are respectively fixedly provided with the rocker arm shaft ( The rocker arm shaft 10 and the rocker arm shaft 9), the rocker arm shaft (the rocker arm shaft 10 and the rocker arm shaft 9) are arranged in a single degree of freedom corresponding to the rocker arm seat (the rocker arm seat 8 and the rocker arm) so as to be rotatable about its own axis. Seat 12), two rocker shafts (rocker shaft 10 and rocker shaft 9) are arranged radially inwardly with respect to the cylinder head body 1 facing the top, radial means the radial direction of the cylinder head body; rocker arm The inclination angle of the shaft (the rocker shaft 10 and the rocker shaft 9) with respect to the mounting surface of the cylinder head body 1 is the same as the inclination angle of the intake valve 31 and the exhaust valve 21 with respect to the vertical center line of the combustion chamber surface 5; (Rocker arm 11 and rocker arm 13) A lever structure having a rocker arm shaft (rocker arm shaft 10 and rocker arm shaft 9) as a fulcrum is formed, and an inclined fixed rocker arm is formed together with the rocker arm shaft. The inclined rocker shaft can be adapted to the inclined valve structure and adapt to the geometry of the composite spherical combustion chamber, which is beneficial to ensure the coordination and sealing of the rocker to move the valve. During the operation of the fixed rocker arm, its various directions The small amount of shaking or shaking can effectively reduce the failure rate of the rocker arm and reduce maintenance costs. Adapting to the position of intake and exhaust to properly arrange the rocker arm, it is also beneficial to ensure valve timing and ensure the phase of the gas distribution, thereby improving performance and reducing emissions. In this embodiment, the rocker arm seat (the rocker arm seat 8 and the rocker arm seat 12) has an upward opening structure, and the rocker arm shafts (the rocker arm shaft 10 and the rocker arm shaft 9) are respectively inserted into the rocker arm seat (rocker arm). Both sides of the opening of the seat 8 and the rocker seat 12) are engaged in such a manner as to be rotatable about their own axes. The single degree of freedom fit means that the axial freedom of the rocker shaft 10 and the rocker shaft 9 is limited, and a structure in which the shoulders respectively abut on the sides of the rocker seat opening are provided on the rocker shaft can also be There are any ways in the art that can limit axial movement and slidable in the circumferential direction. The rocker arm (rocker arm 11 and rocker arm 13) is fixedly disposed on the rocker arm shaft (rocker arm shaft 10 and rocker arm shaft 9) in the opening of the rocker arm seat (rocker arm seat 8 and rocker arm seat 12); rocker arm seat (rocker base 8 and rocker seat 12) The outward side of the opening structure is a split type bearing housing structure. As shown in Fig. 3, the outward side of the opening structure of the rocker base 8 includes a gland 81a and a seat body. 81, a detachable fixed connection between the gland 81a and the seat body 81, and a screw connection in FIG. 3, and a bearing pad 101 for reducing friction (the rocker arm 8 and the rocker seat 12 opening structure are inwardly arranged) The bearing pad is also provided on one side; the outward side of the opening structure of the rocker seat 12 is identical to the outward side of the opening structure of the rocker seat 8. The split bearing housing structure facilitates the installation of the rocker shaft, reduces the friction area, increases the flexibility of the rocker arm movement, and is simple and compact in structure, saving space. The invention also discloses a gasoline engine having the foregoing gasoline engine inclined valve cylinder head, wherein the gasoline engine oblique valve cylinder head is installed on the gasoline engine. Gasoline engines can be used in motorcycles or general machinery, and general machinery includes pumps, fans, compressors, gearshifts, generators, and the like. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting, and the present invention will be described in detail with reference to the preferred embodiments. Modifications or equivalents are intended to be included within the scope of the appended claims.

Claims

Claim

1. A gasoline engine tilt valve head comprising a cylinder head body (1) and an intake passage (3), an exhaust passage (2) and a spark plug mounting hole (6) disposed in the cylinder head body (1) The outer surface of the cylinder head body (1) is provided with a heat sink (4), and the inner side of the cylinder head body (1) forms a combustion chamber surface (5), characterized in that: the cylinder head body (1) is The intake passage (3) is correspondingly provided with an intake valve (31), and an exhaust valve (21) is provided corresponding to the exhaust passage (2), and the intake valve (31) is from bottom to top. The intake passage (3) side is inclined, the exhaust valve (21) is inclined from the bottom to the top toward the exhaust passage (2) side; the intake valve (31) axis and the exhaust valve (21) the axes are perpendicular to the combustion chamber surface

(5) The section of the point of intersection with each other.

2. The gasoline engine tilt valve head according to claim 1, wherein: an inner end of the race (31a) of the intake valve (31) and a race (21a) of the exhaust valve (21) The inner end portion is adapted to the shape of the combustion chamber face (5).

3. The gasoline engine inclined valve cylinder head according to claim 2, wherein: the combustion chamber surface (5) is located between the intake valve (31) and the exhaust valve (21) A nose bridge region is formed, the nose bridge region being located at a width of the combustion chamber face (5) greater than 8 mm.

4. The gasoline engine inclined valve cylinder head according to claim 3, wherein: the intake passage (3) axis and the exhaust passage (5) axis are coplanar.

5. The gasoline engine inclined valve cylinder head according to claim 4, wherein: the intake valve (31) and the exhaust valve (21) are perpendicular to a center line of the combustion chamber surface (5) The angles are 22.5°, respectively, and the intake passage (3) and the exhaust passage (2) are inclined from the inside to the outside with respect to the mounting surface of the cylinder head body (1).

6. The gasoline engine tilt valve head according to claim 5, characterized in that: the outer circumference of the race (31a) of the intake valve (31) and the race of the exhaust valve (21) (21a) The outer circle is tangent to the bottom edge of the combustion chamber face (5).

7. The gasoline engine inclined valve cylinder head according to claim 6, wherein: corresponding to the intake valve

(31) and the exhaust valve (21) are respectively provided with rocker arms (11, 13), and the cylinder head body (1) is provided with a rocker seat corresponding to the corresponding rocker arms (11, 13) (8, 12), the rocker arms (11, 13) are fixedly provided with corresponding rocker shafts (10, 9), and the rocker arm shafts (10, 9) are single degrees of freedom in a manner of being rotatable about their own axes. Set on the corresponding rocker seat (8, 12), two rocker shafts (10, 9) Tilting inwardly with respect to the cylinder head body (1) facing the top, the inclination angles of the rocker shafts (10, 9) with respect to the mounting surface of the cylinder head body (1) are respectively The inclination angles of the intake valve (3) and the exhaust valve (2) with respect to the vertical center line of the combustion chamber surface (5) are the same; the rocker arms (11, 13) are formed with corresponding rocker shafts (10, 9) The lever structure of the fulcrum.

8. The gasoline engine tilt valve head according to claim 7, wherein the rocker seat (8, 12) is an upward opening structure, and the rocker shafts (10, 9) are respectively worn at both ends. And the two sides of the opening of the corresponding rocker seat (8, 12) are engaged with each other so as to be rotatable about their own axes, the rocker arms (11, 13) are located at the corresponding rocker seats (8, 12) The opening is fixedly disposed on the corresponding rocker shaft (10, 9); the outward side of the rocker seat (8, 12) is a split bearing structure, including a gland (81a) And a seat body (81), the gland (81a) and the seat body (81) are detachably fixedly connected.

A gasoline engine having a gasoline engine inclined valve cylinder head according to any one of claims 1 to 8, wherein: said gasoline engine inclined valve cylinder head is mounted to said gasoline engine.