A lightweight cylinder head assembly

Abstract

The present application relates to the technical field of engine, and discloses a lightweight cylinder head assembly, which comprises a cylinder head, a valve assembly and a rocker arm shaft component; the cylinder head is connected with an engine assembly through cylinder head bolts; a cooling jacket inside the cylinder head is used for cooling an air inlet passage and an exhaust passage; the cooling jacket is provided with an arc-shaped flow guide wall for guiding the flow of cooling liquid to a high-heat nose bridge area inside the cylinder head; the upper part of the cylinder head is provided with the rocker arm shaft component for acting on a plurality of valve assemblies; the rocker arm shaft component comprises a valve rocker arm, a rocker arm shaft seat, a rocker arm spring, an adjusting screw and a rocker arm shaft; the rocker arm shaft is a hollow shaft; the bottom of the cylinder head is provided with an open-cast oil channel; the upper part of the cylinder head is provided with a transverse machining oil hole and a vertical machining oil hole; the rocker arm shaft is provided with an arc-shaped cutting groove; and the shaft body of the rocker arm shaft is further provided with an oil outlet hole communicating with the hollow chamber. The present application can realize the lightweight of the cylinder head, significantly improve the cooling efficiency, structural rigidity, lubrication performance and sealing reliability, and reduce the manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of engine technology, specifically to a lightweight cylinder head assembly. Background Technology

[0002] With increasingly stringent emission regulations and ever-increasing market demands for engine power, economy, and compatibility, modern engines are developing towards higher strength, lighter weight, and greater integration. As one of the core assemblies of an engine, the cylinder head assembly has seen a significant increase in structural complexity and the harshness of its operating environment. The cylinder head assembly consists of the cylinder head, cylinder head gasket, cylinder head bolts, valve assembly, valve seat rings, and valve drive mechanism. Its main functions are to seal the engine cylinders and control the entry of fresh air into the cylinders and the exit of combustion exhaust gases. However, existing cylinder head assemblies still have the following deficiencies in structural design and manufacturing processes: 1. In an engine, the valve bridge area (the area between the intake and exhaust valves) is subjected to the dual thermal shocks of high-temperature exhaust and high-pressure combustion, making it the area with the highest thermal load in the cylinder head. Existing cooling water jacket designs often use simple annular or parallel flow channels, resulting in uneven flow velocity distribution of the coolant as it flows through this area. This easily creates cooling dead zones or insufficient turbulence, leading to localized overheating. This not only limits the increase in engine compression ratio but also easily leads to valve seat erosion, cylinder head cracks, and even deformation, affecting engine reliability and service life. 2. In the traditional cylinder head assembly design, the oil inlet path of the rocker arm lubrication passage generally starts from the oil hole on the top surface of the engine block, and finally flows into the interior of the rocker arm bearing through multiple interconnected machining holes on the cylinder head. Each machining hole requires an independent cover, which leads to a complex internal structure of the cylinder head, increasing the difficulty and cost of manufacturing. The unreasonableness of the traditional oil return structure is that the oil flows back to the oil pan through the exhaust pushrod hole. The exhaust pushrod hole cover is connected to the exhaust passage, which will have the adverse effect of increasing the oil temperature. In addition, in the traditional oil return structure, there is a common problem of oil remaining on the top of the cylinder head, resulting in incomplete oil return. Moreover, the existing oil passage design is often quite scattered. 3. In the context of the high-strength development of modern engines, the current cylinder head is mostly fixed with 6 (or more) bolts per cylinder. This makes it difficult to reduce the width of the cylinder head, increasing the overall weight and cost. When a 4-bolt layout is used, due to the large difference in width between the intake and exhaust sides, the bolt sealing force is difficult to be transmitted to the wider side, which can lead to water and oil leakage problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a lightweight cylinder head assembly that, while achieving cylinder head weight reduction, significantly improves cooling efficiency, structural rigidity, lubrication performance and sealing reliability, and reduces manufacturing costs, thus effectively solving the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a lightweight cylinder head assembly, comprising a cylinder head, a valve assembly, and a rocker arm shaft component; The cylinder head is connected to the engine block assembly by cylinder head bolts. The cylinder head is provided with cylinder head bolt through holes that are clearance-fitted with the cylinder head bolts. The cooling water jacket inside the cylinder head is used to cool the intake and exhaust ports. The cooling water jacket is provided with equidistant arrays of arc-shaped guide walls near the intake side to guide the coolant to the high-heat nose area inside the cylinder head. The cylinder head is provided with valve guides and valve seats that cooperate with valve assemblies. The upper part of the cylinder head is provided with a rocker arm shaft assembly that acts on multiple valve assemblies. The rocker arm shaft assembly includes a valve rocker arm, a rocker arm bearing, a rocker arm spring, an adjusting screw, and a rocker arm shaft. The rocker arm shaft is a hollow shaft. The rocker arm shaft is rotatably mounted on the upper part of the cylinder head through multiple rocker arm bearings. The valve rocker arm is movably sleeved on the rocker arm shaft. One end of the valve rocker arm corresponds to the valve assembly, and the other end is threaded with an adjusting screw. The engine block assembly is rotatably fitted with a camshaft. The cylinder head is movably sleeved with multiple pushrods. The upper end of the pushrods abuts against the adjusting screw, and the lower end of the pushrods abuts against the cam on the camshaft through a tappet. The cylinder head is provided with intake pushrod holes and exhaust pushrod holes that are clearance-fitted with the pushrods. The cylinder head has an open cast oil passage at the bottom that connects the cylinder head bolt hole and the oil inlet hole on the top surface of the engine block assembly. The cylinder head has a horizontal oil filling hole that connects to the cylinder head bolt hole. The end of the horizontal oil filling hole is sealed with a plug. The cylinder head and rocker arm bearing both have vertical oil filling holes that connect to the horizontal oil filling hole. The rocker arm shaft has an arc-shaped groove that connects the vertical oil filling hole and the hollow cavity of the rocker arm shaft. The rocker arm shaft also has an oil outlet hole that connects to the hollow cavity.

[0005] Preferably, the lower end of the adjusting screw has a ball head, and the upper end of the push rod has a ball socket that matches the ball head of the adjusting screw; the lower end of the push rod has a ball head, and the inner cavity of the tappet has a conical groove that matches the ball head of the push rod, the two working together to form a wedge-shaped oil film, and the side wall of the tappet has an oil outlet hole that connects to its inner cavity.

[0006] Preferably, the upper part of the cylinder head is provided with an oil sump that is inclined toward the side of the intake pushrod hole and the exhaust pushrod hole, and the top surface height of the oil sump corresponding to the intake pushrod hole is lower than the top surface height of the exhaust pushrod hole.

[0007] Preferably, the cylinder head is fixed with one cylinder head bolt per cylinder, and the bottom of the cooling water jacket is provided with a bottom plate reinforcing rib that connects the latches of all the cylinder head bolts together.

[0008] Preferably, a cylinder head gasket is provided between the cylinder head and the engine block assembly, and the cylinder head gasket has a copper protective ring at the cylinder head bolt through hole on the intake side.

[0009] Preferably, two valve rocker arms are provided at both ends of the rocker arm bearing, one of which acts on the intake valve assembly and the other acts on the exhaust valve assembly; the rocker arm spring is sleeved on the rocker arm shaft and located between the two valve rocker arms between the two rocker arm bearings.

[0010] Preferably, the cylinder head has multiple water inlet holes at the bottom that are connected to the cooling water jacket, the cylinder head has a thermostat housing at the front end, the thermostat housing has multiple square flange outlets that are connected to the cooling water jacket, and the remaining openings of the cooling water jacket are sealed by a cup plug.

[0011] Preferably, the offset distance between the axis of the injector mounting hole of the cylinder head and the cylinder center is 6.5mm; the valve sinking amount of the valve assembly is 0-0.25mm, and the conical surface of the valve assembly head is flush with the conical surface of the port chamfer at the bottom of the cylinder head.

[0012] Preferably, the center of the tappet and the center of the adjusting screw are not coaxial, the tappet is offset from the rocker arm shaft seat, and the distance between the center of the tappet and the center of the adjusting screw is 0.5-1.5mm.

[0013] Preferably, the cylinder head is manufactured using a sand casting process. The cylinder head mold consists of a top sand mold, a bottom sand mold, a water jacket sand core, an intake manifold sand core, and an exhaust manifold sand core, and the mating surface between the top sand mold and the bottom sand mold is a single plane.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, by setting an equidistant array of arc-shaped guide walls on the intake side of the cooling water jacket, can effectively guide the coolant to the high-heat nose area inside the cylinder head, making the coolant flow more uniform and sufficient, significantly improving the cooling efficiency of the high-heat area, and avoiding cylinder head deformation or damage caused by local overheating. 2. The present invention features a bottom plate reinforcing rib at the bottom of the cooling water jacket that connects all the cylinder head bolts together, which effectively enhances the overall rigidity and sealing reliability of the cylinder head bottom, prevents the cylinder head from deforming under the action of bolt preload and combustion pressure, thereby ensuring the sealing performance between the cylinder head and the engine block assembly, extending the service life of the cylinder head. Combined with the fixing method of 4 cylinder head bolts per cylinder, the number of bolts is reduced while ensuring sealing reliability, reducing the structural weight and achieving lightweight design. 3. This invention designs a wedge-shaped oil film structure in the spherical kinematic pair of the tappet and push rod. The wedge-shaped oil film is formed by the eccentric fit between the tappet ball socket and the push rod spherical surface. During the swinging process of the push rod and tappet, a stable hydrodynamic oil film can be formed, which significantly improves the lubrication conditions. At the same time, the push rod and the adjusting screw adopt a spherical hinge, which reduces the wear and friction loss between the kinematic pairs, improves the transmission efficiency and the service life of the components. 4. This invention constructs a complete lubricating oil supply channel by setting an open cast oil passage at the bottom of the cylinder head that connects the cylinder head bolt through hole and the oil inlet hole on the top surface of the engine block assembly, and by cooperating with the horizontal and vertical oil inlets. The lubricating oil starts from the lubricating oil outlet of the engine block assembly, flows sequentially through the cast oil passage, the cylinder head bolt through hole, the horizontal oil inlet, and the vertical oil inlet to the rocker arm shaft, and then lubricates the rocker arm shaft component through the arc-shaped groove and oil outlet hole on the rocker arm shaft. Subsequently, it flows along the push rod to the tappet, and finally flows along the oil outlet hole of the tappet to the camshaft. This achieves sufficient lubrication of the rocker arm shaft component, push rod, tappet, and camshaft, simplifies the lubricating oil supply path, and simplifies the oil passage by using the cylinder head bolt through hole and the intake push rod hole as oil passages, achieving lubrication of multiple components, reducing manufacturing costs, and ensuring the reliability and sufficiency of lubrication. In summary, this invention achieves lightweight cylinder head while significantly improving cooling efficiency, structural rigidity, lubrication performance, and sealing reliability, and reducing manufacturing costs. Attached Figure Description

[0015] Figure 1 This is the general assembly drawing of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a bottom view of the present invention; Figure 5 This is an exploded view of the cylinder head casting of the present invention; Figure 6 This is a schematic diagram of the gasket structure of the present invention; Figure 7 This is a cross-sectional view (AA) of the present invention; Figure 8 This is a BB cross-sectional view of the present invention; Figure 9 This is a CC cross-sectional view of the present invention; Figure 10 This is a schematic diagram of the rocker arm shaft component and its driving component according to the present invention; Figure 11 for Figure 10 A magnified schematic diagram of a local structure.

[0016] In the diagram: 200-engine block assembly, 1-cylinder head, 2-cylinder head bolts, 3-valve assembly, 4-rocker arm shaft assembly, 5-cylinder head gasket, 6-cup plug, 7-plug, 8-valve guide, 9-valve seat ring, 10-pushrod, 11-taper, 12-camshaft, 13-wedge oil film; 1-1 Top sand mold, 1-2 Bottom sand mold, 1-3 Water jacket sand core, 1-4 Intake sand core, 1-5 Exhaust sand core, 1-6 Bottom plate reinforcing rib, 1-7 Arc-shaped guide wall, 1-8 Intake, 1-9 Exhaust, 1-10 Injector mounting hole, 1-11 Casting oil passage, 1-12 Horizontal machine oil filling hole, 1-13 Vertical machine oil filling hole, 1-14 Oil sump, 1-15 Intake push rod hole, 1-16 Exhaust push rod hole, 1-17 Cooling water jacket, 1-18 High-heat nose bridge area, 1-19 Air port chamfer, 4-1 Valve rocker arm, 4-2 Rocker arm bearing seat, 4-3 Rocker arm spring, 4-4 Adjusting screw, 5-1 Copper retaining ring. Detailed Implementation

[0017] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0018] Please see Figure 1-11 The present invention provides the following technical solutions: Example 1: As Figure 1 , Figure 7 and Figure 8 As shown, a lightweight cylinder head assembly includes a cylinder head 1, a valve assembly 3, and a rocker arm shaft assembly 4. The cylinder head 1 is connected to the engine block assembly 200 via cylinder head bolts 2. The cylinder head 1 is provided with cylinder head bolt through holes that are clearance-fitted with the cylinder head bolts 2. The cooling water jacket 1-17 inside the cylinder head 1 is used to cool the intake manifold 1-8 and the exhaust manifold 1-9. The cooling water jacket 1-17 is provided with equidistantly arranged arc-shaped guide walls 1-7 near the intake side to guide the coolant flow to the high-heat nose area 1-18 inside the cylinder head 1, making the coolant flow more uniform and sufficient, significantly improving the cooling efficiency of the high-heat area, and avoiding cylinder head deformation or damage caused by local overheating. like Figure 2 , Figure 3 , Figure 4 and Figure 10As shown, the cylinder head 1 is provided with valve guides 8 and valve seats 9 that cooperate with valve assemblies 3. The upper part of the cylinder head 1 is provided with a rocker arm shaft assembly 4 that acts on multiple valve assemblies 3. The rocker arm shaft assembly 4 includes a valve rocker arm 4-1, a rocker arm shaft seat 4-2, a rocker arm spring 4-3, an adjusting screw 4-4, and a rocker arm shaft. The rocker arm shaft is a hollow shaft. The rocker arm shaft is rotatably mounted on the upper part of the cylinder head 1 through multiple rocker arm shaft seats 4-2. The valve rocker arm 4-1 is movably sleeved on the rocker arm shaft. One end of the valve rocker arm 4-1 corresponds to the valve assembly 3, and the other end is threaded with an adjusting screw 4-4. Two valve rocker arms 4-1 are provided at each end of the rocker arm shaft seat 4-2, one of which acts on the intake valve assembly and the other acts on the exhaust valve assembly. The rocker arm spring 4-3 is sleeved on the rocker arm shaft and located between the two valve rocker arms 4-1 between the two rocker arm shaft seats 4-2; the engine block assembly 200 is rotatably fitted with the camshaft 12, and the cylinder head 1 is movably sleeved with multiple push rods 10. The upper end of the push rod 10 abuts against the adjusting screw 4-4, and the lower end of the push rod 10 abuts against the cam on the camshaft 12 through the tappet 11. The cylinder head 1 is provided with an intake push rod hole 1-15 and an exhaust push rod hole 1-16 that are clearance-fitted with the push rod 10. When the camshaft 12 rotates, it drives the cam to rotate, thereby causing the multiple push rods 10 to move. Each push rod pushes the corresponding valve rocker arm 4-1, thereby realizing the clearance action of the intake valve assembly and the exhaust valve assembly, and realizing the intake and exhaust of the cylinder. The cylinder head 1 has an open cast oil passage 1-11 at its bottom, connecting the cylinder head bolt through hole and the oil inlet hole on the top surface of the engine block assembly 200. The upper part of the cylinder head 1 has a transverse oil filling hole 1-12 connecting the cylinder head bolt through hole. The end of the transverse oil filling hole 1-12 is sealed with a plug 7. Both the upper part of the cylinder head 1 and the rocker arm bearing 4-2 have vertical oil filling holes 1-13 corresponding to and connected to the transverse oil filling hole 1-12. The rocker arm shaft, located within the rocker arm bearing 4-2, has an arc-shaped groove connecting the vertical oil filling hole 1-13 to the hollow cavity of the rocker arm shaft. The rocker arm shaft also has an oil outlet hole connecting to its hollow cavity; thus, a complete lubricating oil supply channel is constructed. Starting from the lubricating oil outlet of the machine body assembly 200, the oil flows sequentially through the casting oil passage 1-11, the cylinder head bolt through hole, the horizontal machine oil filling hole 1-12, and the vertical machine oil filling hole 1-13 to reach the rocker arm shaft. Then, the rocker arm shaft component 4 is lubricated through the arc-shaped groove and oil outlet hole on the rocker arm shaft, achieving sufficient lubrication of the rocker arm shaft component. Subsequently, the push rod 10 and tappet 11 are lubricated through the intake push rod hole 1-15 and the exhaust push rod hole 1-16. The cylinder head bolt through hole, intake push rod hole 1-15, and exhaust push rod hole 1-16 serve as oil passages, simplifying the lubricating oil supply path, eliminating the need to open oil passages, reducing manufacturing costs, and ensuring the reliability and sufficiency of lubrication. The cylinder head 1 has multiple water inlet holes at the bottom that communicate with the cooling water jackets 1-17. The cylinder head 1 has a thermostat housing at the front end, which has multiple square flange outlets that communicate with the cooling water jackets 1-17. The remaining openings of the cooling water jackets 1-17 are sealed by a cup plug 6, ensuring the working efficiency and reliability of the cooling system. At the same time, the cup plug sealing design simplifies the structure and facilitates assembly and maintenance. The offset distance between the axis of the injector mounting holes 1-10 of the cylinder head 1 and the cylinder center is 6.5mm, which optimizes the arrangement of the injectors in the combustion chamber, improves the fuel-air mixing effect, and increases combustion efficiency. The valve sinking of the valve assembly 3 is 0-0.25mm, and the conical surface of the valve assembly 3 head is flush with the conical surface of the port chamfer 1-19 at the bottom of the cylinder head 1, which helps to improve the intake airflow dynamics and enhance engine power performance and fuel economy.

[0019] Example 2: Unlike Example 1, as follows Figure 11 As shown, the lower end of the adjusting screw 4-4 has a ball head, and the upper end of the push rod 10 has a ball socket that matches the ball head of the adjusting screw 4-4. The lower end of the push rod 10 has a ball head, and the inner cavity of the tappet 11 has a tapered groove that matches the ball head of the push rod 10. The two work together to form a wedge-shaped oil film 13. The side wall of the tappet 11 has an oil outlet hole that connects to its inner cavity. The wedge-shaped oil film 13 is formed by the fit between the tappet 11 and the ball surface of the push rod 10. During the swinging process of the push rod 10 and the tappet 11, a stable hydrodynamic oil film can be formed, which significantly improves the lubrication conditions, reduces wear and friction loss between moving parts, improves transmission efficiency and service life of parts. The side wall of the tappet 11 has an oil outlet hole that connects to the inner cavity, which can realize the lubrication of the camshaft 12. At the same time, a wedge-shaped oil film structure is also provided in the spherical moving part of the push rod 10 and the adjusting screw 4-4, which further improves the lubrication reliability of the entire rocker arm shaft assembly 4.

[0020] Example 3: Unlike Example 1, as follows Figure 2 and Figure 9 As shown, the upper part of the cylinder head 1 is provided with an oil sump 1-14 inclined towards the intake pushrod hole 1-15 and the exhaust pushrod hole 1-16. This oil sump is used to collect the lubricating oil falling from the rocker arm shaft and to allow the lubricating oil to flow to the intake pushrod hole 1-15 and the exhaust pushrod hole 1-16. The top surface of the intake pushrod hole 1-15 corresponding to the oil sump 1-14 is lower than the top surface of the exhaust pushrod hole 1-16, so that the lubricating oil can flow into the lower camshaft 12 from the intake pushrod hole 1-15 as much as possible, thereby achieving lubrication of the camshaft 12. Because the exhaust pushrod hole 1-16 is close to the exhaust passage 1-9 of the cylinder head 1, and the exhaust temperature of the exhaust passage 1-9 is high, the temperature rise of the lubricating oil is reduced.

[0021] Example 4: Unlike Example 1, as follows Figure 6 and Figure 7As shown, the cylinder head 1 is fixed with 4 cylinder head bolts 2 per cylinder. Compared with the 6-bolt fixing method, the overall width of the cylinder head 1 is reduced by 8%, which has the beneficial effects of compact structure and light weight. The bottom of the cooling water jacket 1-17 is provided with bottom plate reinforcing ribs 1-6 that connect all the cylinder head bolts 2 to each other, thereby increasing the overall rigidity of the cylinder head and strengthening the sealing effect of the cylinder head gasket. A cylinder head gasket 5 is provided between the cylinder head 1 and the engine block assembly 200. The cylinder head gasket 5 is provided with a copper protective ring 5-1 at the cylinder head bolt through hole on the intake side, thereby enhancing the sealing force of the exhaust side structure and offsetting the adverse effect of the asymmetry of the intake and exhaust side structure widths on the sealing performance.

[0022] Example 5: Unlike Example 1, the center of the tappet 11 is not on the same axis as the center of the adjusting screw 4-4. The tappet 11 is offset from the rocker arm shaft seat 4-2. The distance between the center of the tappet 11 and the center of the adjusting screw 4-4 is 0.5-1.5mm. When the rocker arm shaft component drives the component to operate, the valve rocker arm 4-1 is always subjected to a lateral force from the push rod 10 and is pressed against the rocker arm shaft seat 4-2 to prevent the rocker arm spring 4-3 from oscillating and becoming unstable due to manufacturing and assembly errors.

[0023] Example 6: Unlike Example 1, as follows Figure 5 As shown, the cylinder head 1 is manufactured using sand casting. The cylinder head mold consists of a top sand mold 1-1, a bottom sand mold 1-2, a water jacket sand core 1-3, an intake manifold sand core 1-4, and an exhaust manifold sand core 1-5. The mating surface between the top sand mold 1-1 and the bottom sand mold 1-2 is a single plane. The cylinder head 1 is manufactured using sand casting, and the mold adopts an integrated design concept. Its constituent parts are only 5 (2 sand molds and 3 sand cores). The number of positioning surfaces between the sand molds and sand cores effectively increases the accuracy of the blank and eliminates the problems of increased cost and large offset between structural features caused by complex molds. At the same time, the mating surface between the top sand mold and the bottom sand mold is designed as a single plane, reducing the time spent on burr grinding.

[0024] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents in the content of this invention.

Claims

1. A lightweight cylinder head assembly, comprising a cylinder head (1), a valve assembly (3), and a rocker arm shaft assembly (4), characterized in that: The cylinder head (1) is connected to the engine block assembly (200) by cylinder head bolts (2). The cylinder head (1) is provided with cylinder head bolt through holes that are clearance-fitted with the cylinder head bolts (2). The cooling water jacket (1-17) inside the cylinder head (1) is used to cool the intake manifold (1-8) and the exhaust manifold (1-9). The cooling water jacket (1-17) is provided with arc-shaped guide walls (1-7) arranged at equal intervals near the intake side to guide the coolant to the high-heat nose bridge area (1-18) inside the cylinder head (1). The cylinder head (1) is provided with valve guides (8) and valve seats (9) that cooperate with valve assemblies (3). The upper part of the cylinder head (1) is provided with rocker arm shaft components (4) that act on multiple valve assemblies (3). The rocker arm shaft components (4) include a valve rocker arm (4-1), a rocker arm bearing (4-2), a rocker arm spring (4-3), an adjusting screw (4-4), and a rocker arm shaft. The rocker arm shaft is a hollow shaft. The rocker arm shaft is rotatably mounted on the upper part of the cylinder head (1) through multiple rocker arm bearings (4-2). The valve rocker arm (4-1) is movably sleeved on the rocker arm shaft. One end of the arm (4-1) corresponds to the valve assembly (3), and the other end is threaded with an adjusting screw (4-4); the engine block assembly (200) is rotatably fitted with a camshaft (12), and the cylinder head (1) is movably fitted with multiple push rods (10). The upper end of the push rod (10) is in contact with the adjusting screw (4-4), and the lower end of the push rod (10) is in contact with the cam on the camshaft (12) through a tappet (11). The cylinder head (1) is provided with an intake push rod hole (1-15) and an exhaust push rod hole (1-16) that are clearance-fitted with the push rod (10). The bottom of the cylinder head (1) is provided with an open cast oil passage (1-11) that connects the cylinder head bolt through hole and the oil inlet hole on the top surface of the engine block assembly (200). The upper part of the cylinder head (1) is provided with a horizontal machine oiling hole (1-12) that connects the cylinder head bolt through hole. The end of the horizontal machine oiling hole (1-12) is sealed by a plug (7). The upper part of the cylinder head (1) and the rocker arm shaft seat (4-2) are both provided with a vertical machine oiling hole (1-13) that corresponds to and connects with the horizontal machine oiling hole (1-12). The shaft body of the rocker arm shaft located in the rocker arm shaft seat (4-2) is provided with an arc-shaped groove that connects the vertical machine oiling hole (1-13) and the hollow cavity of the rocker arm shaft. The shaft body of the rocker arm shaft is also provided with an oil outlet hole that connects with the hollow cavity.

2. The lightweight cylinder head assembly according to claim 1, characterized in that: The lower end of the adjusting screw (4-4) has a ball head, and the upper end of the push rod (10) is provided with a ball socket that matches the ball head of the adjusting screw (4-4); the lower end of the push rod (10) has a ball head, and the inner cavity of the tappet (11) has a conical groove that matches the ball head of the push rod (10). The two work together to form a wedge-shaped oil film (13), and the side wall of the tappet (11) is provided with an oil outlet hole that connects to its inner cavity.

3. A lightweight cylinder head assembly according to claim 1, characterized in that: The upper part of the cylinder head (1) is provided with an oil sump (1-14) inclined towards the side of the intake push rod hole (1-15) and the exhaust push rod hole (1-16), and the top surface height of the oil sump (1-14) corresponding to the intake push rod hole (1-15) is lower than the top surface height of the exhaust push rod hole (1-16).

4. A lightweight cylinder head assembly according to claim 1, characterized in that: The cylinder head (1) is fixed with 4 cylinder head bolts (2) per cylinder, and the bottom of the cooling water jacket (1-17) is provided with bottom plate reinforcing ribs (1-6) that connect the latches of all the cylinder head bolts (2) to each other.

5. A lightweight cylinder head assembly according to claim 1, characterized in that: A cylinder head gasket (5) is provided between the cylinder head (1) and the engine block assembly (200), and a copper protective ring (5-1) is provided at the cylinder head bolt hole on the intake side of the cylinder head gasket (5).

6. A lightweight cylinder head assembly according to claim 1, characterized in that: Two valve rocker arms (4-1) are respectively provided at both ends of the rocker arm bearing (4-2), one of which acts on the intake valve assembly and the other acts on the exhaust valve assembly; the rocker arm spring (4-3) is sleeved on the rocker arm shaft and located between the two valve rocker arms (4-1) between the two rocker arm bearings (4-2).

7. A lightweight cylinder head assembly according to claim 1, characterized in that: The cylinder head (1) has multiple water inlet holes at the bottom that are connected to the cooling water jacket (1-17). The cylinder head (1) has a thermostat housing at the front end. The thermostat housing has multiple square flange outlets that are connected to the cooling water jacket (1-17). The remaining openings of the cooling water jacket (1-17) are sealed by a bowl plug (6).

8. A lightweight cylinder head assembly according to claim 1, characterized in that: The offset distance between the axis of the injector mounting hole (1-10) of the cylinder head (1) and the cylinder center is 6.5mm; the valve sinking amount of the valve assembly (3) is 0-0.25mm, and the cone surface of the head of the valve assembly (3) is flush with the cone surface of the port chamfer (1-19) at the bottom of the cylinder head (1).

9. A lightweight cylinder head assembly according to claim 1, characterized in that: The center of the tappet (11) is not on the same axis as the center of the adjusting screw (4-4), the tappet (11) is offset from the rocker arm shaft seat (4-2), and the distance between the center of the tappet (11) and the center of the adjusting screw (4-4) is 0.5-1.5mm.

10. A lightweight cylinder head assembly according to claim 1, characterized in that: The cylinder head (1) is made by sand casting process. The cylinder head mold consists of a top sand mold (1-1), a bottom sand mold (1-2), a water jacket sand core (1-3), an intake sand core (1-4), and an exhaust sand core (1-5). The mating surface between the top sand mold (1-1) and the bottom sand mold (1-2) is a single plane.

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