CN211174371U

CN211174371U - Cylinder cover structure

Info

Publication number: CN211174371U
Application number: CN201921554762.0U
Authority: CN
Inventors: 朱杰; 兰棠洁
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-08-04
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a cylinder head structure, including roof, bottom plate, two above bolt hole lugs and valve guide lug, the roof set up in the top of bottom plate, the both ends of bolt hole lug are connected respectively the roof with the bottom plate, valve guide lug is established the middle part of roof, the roof with be equipped with the air flue between the bottom plate, the bolt hole lug is respectively through air flue outer wall connection the valve guide lug. The utility model discloses be favorable to strengthening the rigidity of cylinder head, reduce the deflection of cylinder head bottom plate, reduce towards the jar pad and reduce valvetrain's unusual wearing and tearing hidden danger.

Description

Cylinder cover structure

Technical Field

The utility model relates to the technical field of engines, especially, relate to a cylinder head structure.

Background

Along with the upgrading of the emission, the requirements on various performance indexes of the diesel engine are continuously improved. At present, the maximum detonation pressure index designed for diesel engines meeting the national Liu-b emission regulations is generally more than 20MPa, which leads to the increase of the wear failure rate of cylinder cushion and valve mechanism. Therefore, measures are required to enhance the rigidity of the cylinder head and enhance the sealing performance of the joint surface between the cylinder head and the cylinder block, thereby reducing the failure rate of the wear of the cylinder head gasket and the valve train.

It is known that there is a strain in force, and at high explosion pressures, deformation of the cylinder head is inevitable, especially at high cylinder head firing surfaces. And in the peripheral area of the cylinder cover bolt hole, the cylinder cover screw hole lug is directly compressed by the pretightening force of the bolt, so that the displacement of the cylinder cover bolt screw hole lug is relatively small.

The current common method for enhancing the rigidity of the cylinder cover is to thicken the thickness of the bottom plate 2 of the air sealing part or add a reinforcing rib 9 between two nail hole lugs of the cylinder cover, as shown in figure 3.

However, the above method has a limit to the enhancement of the rigidity of the head base plate. Under the condition of high explosion pressure, high-pressure gas pushes a fire surface of a cylinder cover to generate displacement deformation, each valve is surrounded by an air passage outer wall connected with a cylinder cover bottom plate, the air passage outer wall forms a hollow supporting column, the upper part of the hollow air passage supporting column is connected with a guide pipe lug, the cylinder cover bottom plate and the cylinder cover bottom plate are pushed by the explosion pressure to push the air passage outer wall, and the air passage outer wall pushes the guide pipe lug, so that the cylinder cover bottom plate and the guide pipe hole lug are deformed along with the explosion pressure, and the cylinder cushion and the valve mechanism are easy to generate abnormal abrasion faults when deviating from normal working.

In order to enhance the local strength of each part of the cylinder cover, chinese patent application No. CN105257423B on 11/13/2015, entitled cylinder cover, discloses a cylinder cover, which adds a plurality of reinforcing ribs at a plurality of positions of the cylinder cover to enhance the local strength of each part of the cylinder cover, thereby forming a solid frame structure between a top plate and a bottom plate. The novel cylinder cover has the disadvantages that for each cylinder, only one reinforcing rib in the four valve guide pipe lugs connects one valve guide pipe lug with the bolt hole lug, the rigidity of the novel cylinder cover is enhanced limitedly, and the deformation of the novel cylinder cover cannot be well prevented when the novel cylinder cover faces the high explosion pressure index of the national six-model.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a cylinder head structure is favorable to strengthening the rigidity of cylinder head, reduces the deflection of cylinder head bottom plate, reduces towards the jar pad and reduces valvetrain's unusual wearing and tearing hidden danger.

The utility model discloses take following technical scheme to realize above-mentioned purpose:

the utility model provides a cylinder head structure, includes roof, bottom plate, two above bolt hole lugs and valve guide lug, the roof set up in the top of bottom plate, the both ends of bolt hole lug are connected respectively the roof with the bottom plate, valve guide lug is established the middle part of roof, the roof with be equipped with the air flue between the bottom plate, the bolt hole lug is respectively through air flue outer wall connection the valve guide lug.

Preferably, the top plate and the bottom plate are integrally formed, the valve guide lug is provided with a valve guide, and the lower part of the valve guide extends into the air passage.

Preferably, the number of the valve guide lugs is four, and each two valve guide lugs are symmetrically arranged with respect to the center of the top plate.

Preferably, the bolt hole lugs are six, and each two bolt hole lugs are symmetrically arranged with respect to the center of the cylinder head.

The utility model has the advantages that:

the utility model discloses a cylinder head structure passes through the air flue outer wall and links to each other bolt hole lug and valve guide lug, has strengthened the whole rigidity of cylinder head, the deflection of the cylinder head fire face that has significantly reduced to make the gas sealing position leakproofness strengthen, make valve guide lug deformation displacement volume reduce, reduced towards the risk of jar pad, the abnormal wear of valve mechanism.

Drawings

Fig. 1 is a cross-sectional view of a single cylinder of a cylinder head structure provided by the present invention;

fig. 2 is a cross-sectional view of the cylinder head structure provided by the present invention;

fig. 3 is a schematic structural diagram of a conventional cylinder head described in the background of the present invention.

In the figure, 1-top plate, 2-bottom plate, 3-air flue, 4-bolt hole strap, 41-first bolt hole strap, 42-second bolt hole strap, 43-third bolt hole strap, 44-fourth bolt hole strap, 45-fifth bolt hole strap, 46-sixth bolt hole strap, 5-valve guide strap, 51-first valve guide strap, 52-second valve guide strap, 53-third valve guide strap, 54-fourth valve guide strap, 6-air flue outer wall, 61-first air flue outer wall, 62-second air flue outer wall, 63-third air flue outer wall, 64-fourth air flue outer wall, 65-fifth air flue outer wall, 66-sixth air flue outer wall, 7-valve guide, 8-valve, 9-reinforcing ribs.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings 1-2 and the detailed description thereof.

Please refer to fig. 1 and fig. 2 simultaneously, the embodiment of the present invention provides a cylinder head structure, which includes a top plate 1, a bottom plate 2, two or more bolt hole lugs 4 and a valve guide lug 5. The top plate 1 is arranged above the bottom plate 2, two ends of the bolt hole lug 4 are respectively connected with the top plate 1 and the bottom plate 2, and the valve guide lug 5 is arranged in the middle of the top plate 1. An air passage 3 is arranged between the top plate 1 and the bottom plate 2, and the bolt hole lugs 4 are respectively connected with the valve guide pipe lugs 5 through an air passage outer wall 6.

The utility model discloses a cylinder head structure is when using, links to each other bolt hole lug 4 and valve pipe lug 5 respectively through air flue outer wall 6. The bolt hole lug 4 of the cylinder cover and the peripheral area thereof are compressed by the bolt, and the displacement is extremely small under the detonation pressure. After the valve guide lug 5 is connected with the bolt hole lug 4, the rigidity is enhanced, the displacement of the valve guide lug 5 is obviously reduced, and a hollow supporting column is formed outside an air passage connected with the cylinder cover bottom plate 2 below the valve guide lug 5, so that the displacement (or called as cylinder head lifting amount) of the cylinder cover bottom plate 2 is also obviously reduced, the whole rigidity of the cylinder cover is enhanced by the structure, the fire surface of the cylinder cover bottom plate 2 and the deformation displacement of the valve guide lug 5 are greatly reduced, the sealing performance of a gas sealing part is enhanced, the motion and normal matching of a valve mechanism are ensured, and the risk of abnormal abrasion of a cylinder cushion and the valve mechanism is reduced.

Furthermore, the top plate 1 and the bottom plate 2 are integrally formed, the valve guide lug 5 is provided with a valve guide 7, and the lower part of the valve guide 7 extends into the air passage 3.

Furthermore, four valve guide lugs 5 are respectively a first valve guide lug 51, a second valve guide lug 52, a third valve guide lug 53 and a fourth valve guide lug 54, and every two valve guide lugs 5 are symmetrically arranged relative to the center of the top plate 1, so that the purpose of uniform stress is achieved, and the top plate 1 is prevented from being easily deformed. In the present embodiment, the first valve guide lug 51 and the fourth valve guide lug 54 are symmetrically arranged with respect to the center of the top plate 1, and the second valve guide lug 52 and the third valve guide lug 53 are symmetrically arranged with respect to the center of the top plate 1.

Furthermore, the number of the bolt hole lugs 4 is six, the bolt hole lugs are respectively a first bolt hole lug 41, a second bolt hole lug 42, a third bolt hole lug 43, a fourth bolt hole lug 44, a fifth bolt hole lug 45 and a sixth bolt hole lug 46, and every two bolt hole lugs 4 are symmetrically arranged relative to the center of the cylinder cover, so that the purpose of uniform stress is achieved, and the top plate 1 and the bottom plate 2 are prevented from being easily deformed. In the present embodiment, the first bolt hole strap 41 and the sixth bolt hole strap 46 are symmetrically arranged with respect to the center of the cylinder head, the second bolt hole strap 42 and the fifth bolt hole strap 45 are symmetrically arranged with respect to the center of the cylinder head, and the third bolt hole strap 43 and the fourth bolt hole strap 44 are symmetrically arranged with respect to the center of the cylinder head.

Correspondingly, the number of the outer airway walls 6 is six, namely a first outer airway wall 61, a second outer airway wall 62, a third outer airway wall 63, a fourth outer airway wall 64, a fifth outer airway wall 65 and a sixth outer airway wall 66.

In the present embodiment, the first bolt hole lug 41 is connected to the first valve guide lug 51 through the first duct outer wall 61. The second bolt hole lug 42 is connected to the second valve guide lug 52 by a second port outer wall 62. The third bolt hole lug 43 is connected to the second valve guide lug 52 through a third port outer wall 63. The fourth bolt hole strap 44 is connected to the third valve guide strap 53 by a fourth airway outer wall 64. The fifth bolt hole lug 45 is connected to the third valve guide lug 53 through a fifth duct outer wall 65. The sixth bolt hole lug 46 is connected to the fourth valve guide lug 54 by a sixth duct outer wall 66.

Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The cylinder cover structure is characterized by comprising a top plate, a bottom plate, more than two bolt hole lugs and a valve guide lug, wherein the top plate is arranged above the bottom plate, two ends of the bolt hole lugs are respectively connected with the top plate and the bottom plate, the valve guide lug is arranged in the middle of the top plate, an air passage is arranged between the top plate and the bottom plate, and the bolt hole lugs are respectively connected with the valve guide lug through the outer wall of the air passage.

2. The cylinder head structure of claim 1, wherein the top plate and the bottom plate are integrally formed, and a valve guide is provided on the valve guide tab, and a lower portion of the valve guide extends into the air passage.

3. The cylinder head structure according to claim 1, wherein the valve guide tabs are four, and each two valve guide tabs are arranged symmetrically with respect to a center of the head plate.

4. The cylinder head structure according to claim 1, wherein the bolt hole lugs are six, and each two bolt hole lugs are arranged symmetrically with respect to the center of the cylinder head.