WO2015074442A1

WO2015074442A1 - Cylinder cover of four-valve diesel engine

Info

Publication number: WO2015074442A1
Application number: PCT/CN2014/083536
Authority: WO
Inventors: 沈捷; 李伟; 黄永仲; 王利乐; 蔡晓霞
Original assignee: 广西玉柴机器股份有限公司
Priority date: 2013-11-25
Filing date: 2014-08-01
Publication date: 2015-05-28
Also published as: DE112014005363T5; CN103603741A; GB2536136B; GB2536136A; AU2014101535A4; GB201603850D0; CN103603741B

Abstract

A cylinder cover of a four-valve diesel engine comprises a cylinder cover body (1), a rocker arm shaft mounting hole (11), and a valve bridge guide rod mounting hole (12). The cylinder cover body (1) is of a four-valve cylinder cover structure. The rocker arm shaft mounting hole (11) is used for mounting a rocker arm shaft. The rocker arm shaft is used for mounting an air exhaust valve rocker arm (141) and an air inlet valve rocker arm (142). The valve bridge guide rod mounting hole (12) is used for mounting a valve bridge guide rod (121). A valve bridge (122) is inserted into the upper end of the valve bridge guide rod (121). In the cylinder cover of a four-valve diesel engine, the rocker arm shaft mounting hole (11) and the valve bridge guide rod mounting hole (12) are integrated in the cylinder cover body (1), so that it can ensured that the rocker arm shaft is conveniently and quickly mounted, and an air inlet valve rocker arm assembly and an exhaust valve rocker arm assembly are reliable in operation; the number of auxiliary parts are reduced, and the disassembly and assembly are easy.

Description

Four-valve diesel engine cylinder head

The invention relates to the field of engines, and in particular to a cylinder head of a four-valve diesel engine. Background technique

As we all know, the cylinder head of the diesel engine is an important part of the diesel engine, and many parts of the valve train must be attached to the cylinder head for installation and use. The rocker shaft support is used for separate processing, and some rocker shaft bearings are used. The rocker arm shaft is also processed during machining. Some of the rocker arm shaft supports are reserved for the rocker arm shaft mounting hole, and the rocker arm shaft support is fixed to the cylinder head by bolt connection. The intake valve rocker arm assembly and the exhaust valve rocker arm assembly in the valve train are assembled on the rocker arm support fixed to the cylinder head through the rocker shaft, and the rocker shaft support passes through the corresponding lubricating oil passage to the intake air The rotating portion of the door rocker assembly and the exhaust valve rocker assembly provides lubrication and cooling.

At present, the cylinder heads used in domestic diesel engines usually do not include the rocker shaft bearings. The rocker shaft bearings need to be separately processed and fixed by bolts and cylinder heads. The number of parts for auxiliary installation and positioning is large, and the structure is not compact. The positioning accuracy is low, the accessibility during maintenance is poor, and the selection is not flexible enough due to the limited installation space. Summary of the invention

The present invention is to overcome the above-mentioned deficiencies in the prior art, and provides a four-valve diesel engine cylinder head which is integrated with a rocker shaft support, has a simple and compact structure, high positioning accuracy, convenient assembly and disassembly, compact structure and convenient maintenance.

In order to achieve the above object, according to the present invention, a four-valve diesel engine cylinder head is provided, comprising: a cylinder head body, which is a four-valve cylinder head structure;

Rocker shaft mounting hole for mounting a rocker arm shaft for mounting an exhaust valve rocker arm and an intake valve rocker arm; The valve bridge guide rod mounting hole is used to install the valve bridge guide rod, and the upper end of the valve bridge guide rod is inserted with the valve bridge.

In the above technical solution, the top of the cylinder head body is a polygonal reinforced frame structure with reinforcing ribs.

In the above technical solution, the valve bridge guide rod mounting holes are two, and one valve bridge guide rod is installed in each of the two valve bridge guide rod mounting holes. In the above technical solution, the gap between the valve bridge and the valve guide rod is matched by a gap.

Compared with the prior art, the invention has the following beneficial effects: The cylinder head of the four-valve diesel engine is integrated with a rocker shaft mounting hole and a valve bridge guide rod mounting hole on the cylinder head body for mounting the rocker shaft and the valve bridge guide On the one hand, because of the integral structural design of the rocker shaft mounting hole and the cylinder head, the rocker arm shaft is easy to install, compact and accurate, and the intake valve rocker arm assembly and the exhaust valve rocker arm assembly The work is more reliable; the related auxiliary positioning, installation and sealing parts are greatly reduced, thereby reducing the cost; the accessibility of maintenance and maintenance is good, and it is easy to assemble and disassemble, which is beneficial to popularization and application. On the other hand, due to the integration of the valve bridge guide rod mounting hole on the cylinder head body, the valve bridge guide rod is added to the cylinder head, and the up and down position movement in the valve bridge work is more accurate, and the valve bridge is not prone to flipping and flying off during work. The opening action of the valve is smoother and more accurate.

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a In the drawing:

1 is a schematic top plan view of a cylinder head of a four-valve diesel engine of the present invention;

Figure 2 is a cross-sectional structural view of the A-A direction of Figure 1;

Figure 3 is a cross-sectional view showing the structure of Figure 1 in the direction of BB; Figure 4 is a cross-sectional view showing the structure of the CC in Figure 1;

The following reference numerals are marked on the drawing in conjunction with the drawings:

I-cylinder head body;

I I-rocker shaft mounting hole;

12-valve bridge guide rod mounting hole;

121-valve bridge guide rod;

122-valve bridge;

123- intake valve bearing surface;

124-Exhaust valve bearing surface;

13- stiffener plate;

14-rocker shaft;

141-exhaust door rocker arm;

142- intake valve rocker arm;

143-valve bridge clamp. detailed description

The preferred embodiments of the present invention are described with reference to the accompanying drawings, and the preferred embodiments of the present invention are intended to illustrate and explain the invention.

The cylinder head of the four-valve diesel engine of the invention integrates a rocker shaft mounting hole and a valve bridge guide rod mounting hole on the cylinder head body for mounting the rocker shaft and the valve bridge guide rod; on the one hand, the rocker shaft is mounted by the rocker arm The integrated structural design of the hole and the cylinder head ensures easy installation of the rocker shaft, compact structure and accurate positioning. The operation of the intake valve rocker arm assembly and the exhaust valve rocker arm assembly is more reliable; the auxiliary auxiliary positioning is greatly reduced. , installation and sealing of components to reduce costs; easy access to maintenance and maintenance, easy to assemble and disassemble, and promote the application. On the other hand, due to the integration of the valve bridge guide rod mounting hole on the cylinder head body, the valve bridge guide rod is added to the cylinder head, and the up and down position movement in the valve bridge work is more accurate, and the valve bridge is not prone to flipping and flying off during work. Opening of the valve The movement is more smooth and accurate.

As shown in FIG. 1 to FIG. 4, the specific structure of the cylinder head of the four-valve diesel engine includes: a cylinder head body 1 , and a rocker shaft mounting hole 11 and a valve bridge guide rod mounting hole 12 which are opened on the cylinder head body 1. The rocker shaft mounting hole 11 is used to mount the rocker arm shaft, and the intake valve rocker arm and the exhaust valve rocker arm are mounted on the rocker arm shaft, ensuring convenient installation of the rocker arm shaft, compact structure, accurate positioning, and the intake valve rocker arm The components and the exhaust valve rocker arm assembly work more reliably; the associated auxiliary positioning, installation and sealing of components are greatly reduced, thereby reducing costs; the accessibility of maintenance and service is good, easy to assemble and disassemble, and is conducive to popularization and application. The valve bridge guide rod mounting hole 12 is used for installing the valve bridge guide rod, so that the up and down position movement of the valve bridge is more accurate, and the valve bridge is not prone to flipping and flying off during the working, and the opening action of the valve is smoother and more accurate.

The cylinder head body 1 is a four-valve cylinder head structure, that is, a structure of two intake valves and two exhaust valves, and a polygonal reinforced frame structure with a reinforcing rib 13 at the top of the cylinder head body 1 is formed by a polygonal reinforcement. The frame is used to improve the overall rigidity of the cylinder head, and after the cylinder head bolt is tightened, the pressure distribution on the mounting surface between the cylinder head and the body is more uniform, and the sealing is more reliable.

As shown in FIG. 1 and FIG. 3, a rocker arm shaft 14 is mounted in the rocker shaft mounting hole 11, and an exhaust valve rocker arm 141 and an intake valve rocker arm 142 are further mounted on the rocker arm shaft 14 at the exhaust valve. A valve bridge pressing block 143 is disposed in each of the rocker arm 141 and the intake valve rocker arm 142. When installing, firstly insert the intake valve rocker bearing into the intake valve bearing hole laterally, and the exhaust valve rocker bearing into the exhaust valve bearing hole, then the inner end shaft of the rocker shaft of the rocker shaft 14 And the 0-type sealing ring is respectively installed in the sealing groove of the outer shaft of the rocker shaft, the inner shaft of the rocker shaft is inserted into the rocker shaft mounting hole 11, and then the inlet valve of the washer and the rocker arm of the intake valve is sequentially inserted. Rocker bearing, washer, exhaust valve rocker bearing and washer on the rocker arm of the exhaust valve, and finally insert the outer end shaft of the rocker shaft into the rocker shaft mounting hole 11; the inner end shaft of the rocker shaft and the rocker arm The 0-ring seal on the shaft of the shaft serves as a sealing function; the gasket prevents wear between the contact surfaces and effectively ensures the safety of the assembly.

As shown in FIG. 1 and FIG. 4, the valve bridge guide rod mounting holes 12 are two, and each of the two valve bridge guide rod mounting holes 12 is mounted with a valve bridge guide rod 121, which is installed in an interference fit manner, in the valve. The upper end of the bridge guide rod 121 is also inserted with a valve bridge 122. The valve bridge 122 and the valve bridge guide rod 121 are gap-fitted. When the engine is in operation, the valve bridge 122 can move up and down along the axis direction of the valve bridge guide rod 121. In addition, the valve bridge 122 includes an intake valve bearing surface 123 for pushing the intake valve, and an exhaust valve bearing surface 124 for pushing the exhaust valve, and an intake valve bearing surface 123 for pushing the intake valve is used for the engine. The opening of the intake valve is pushed during operation, and the exhaust valve bearing surface 124 that pushes the exhaust valve to open is used to push the exhaust valve to open when the engine is working. The valve bridge with the machining hole is installed with the valve bridge guide rod, and the valve bridge can be moved along the axial direction of the valve guide rod under the push of the intake valve rocker arm or the exhaust valve rocker arm, thereby improving the structure of the valve bridge. Stability, avoiding the valve bridge when the engine is running at high speed, the valve rocker is affected by inertia and the valve bridge is no longer moving synchronously or the valve rocker is biased against the valve bridge, the valve bridge flips or bounces and causes the valve bridge Falling off or stuck and affecting the normal operation of the engine.

In summary, the cylinder head of the four-valve diesel engine is integrated with a rocker shaft mounting hole and a valve bridge guide rod mounting hole on the cylinder head body for mounting the rocker arm shaft and the valve bridge guide rod; The integrated structural design of the mounting hole and the cylinder head ensures easy installation of the rocker shaft, compact structure and accurate positioning. The operation of the intake valve rocker arm assembly and the exhaust valve rocker arm assembly is more reliable; the related auxiliary is greatly reduced. Positioning, installing and sealing parts to reduce costs; easy access to maintenance and service, easy to assemble and disassemble, and easy to promote applications. On the other hand, due to the integration of the valve bridge guide rod mounting hole on the cylinder head body, the valve bridge guide rod is added to the cylinder head, and the up and down position movement in the valve bridge work is more accurate, and the valve bridge is not prone to flipping and flying off during work. The opening action of the valve is smoother and more accurate.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A four-valve diesel engine cylinder head, comprising:

a cylinder head body, which is a four-valve cylinder head structure;

a rocker shaft mounting hole for mounting a rocker shaft for mounting an exhaust valve rocker arm and an intake valve rocker arm;

A valve bridge guide rod mounting hole is provided for mounting a valve bridge guide rod, and a valve bridge is inserted at an upper end of the valve bridge guide rod.

2. The four-valve diesel engine cylinder head according to claim 1, wherein: the top of the cylinder head body is a polygonal reinforced frame structure with a stiffener plate.

3. The cylinder head of a four-valve diesel engine according to claim 1, wherein: the valve bridge guide rod mounting holes are two, and one of the two valve bridge guide rod mounting holes is mounted with a valve bridge guide rod. .

The cylinder head of a four-valve diesel engine according to any one of claims 1 to 3, characterized in that: the valve bridge guide rod and the valve bridge guide rod mounting hole are interference-fitted.

5. The cylinder head of a four-valve diesel engine according to claim 4, wherein: a clearance fit is formed between the valve bridge and the valve guide rod.