CN211174369U

CN211174369U - Cylinder cover

Info

Publication number: CN211174369U
Application number: CN201921554775.8U
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, 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, bolt hole lug is connected through the strengthening rib respectively 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

Technical Field

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

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.

At present, the common method for enhancing the rigidity of the cylinder cover is to thicken the thickness of a bottom plate 2 of an air sealing part or add a reinforcing rib 6 between two nail hole passing 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 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 cylinder cover comprises 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, and the bolt hole lugs are respectively connected with the valve guide lug through reinforcing ribs.

Preferably, the top plate and the bottom plate are integrally formed, an air passage is arranged between the top plate and the bottom plate, an air valve guide pipe is arranged on the air valve guide pipe lug, and the lower portion of the air valve guide pipe 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 passes through the strengthening rib 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 and seal the gas position leakproofness reinforcing, 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 provided by the present invention;

fig. 2 is a cross-sectional view of the cylinder head 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 channel, 4-bolt hole lug, 41-first bolt hole lug, 42-second bolt hole lug, 43-third bolt hole lug, 44-fourth bolt hole lug, 45-fifth bolt hole lug, 46-sixth bolt hole lug, 5-valve guide lug, 51-first valve guide lug, 52-second valve guide lug, 53-third valve guide lug, 54-fourth valve guide lug, 6-reinforcing rib, 61-first reinforcing rib, 62-second reinforcing rib, 63-third reinforcing rib, 64-fourth reinforcing rib, 65-fifth reinforcing rib, 66-sixth reinforcing rib, 7-valve guide and 8-valve.

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, the embodiment of the present invention provides a cylinder head, which includes a top plate 1, a bottom plate 2, two or more bolt hole lugs 5 and a valve guide lug 5. The top plate 1 is arranged above the bottom plate 2, and the two ends of the bolt hole lug 4 are respectively connected with the top plate 1 and the bottom plate 2. The valve guide lug 5 is arranged in the middle of the top plate 1. The bolt hole lugs 4 are respectively connected with the valve guide pipe lugs 5 through reinforcing ribs 6.

The utility model discloses a cylinder head is when using, links to each other bolt hole lug 4 and valve pipe lug 5 respectively through strengthening rib 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.

Further, roof 1 and bottom plate 2 integrated into one piece, and be equipped with air flue 3 between roof 1 and the bottom plate 2, be equipped with valve guide 7 on the valve guide lug 5, the below of valve guide 7 stretches into in the air flue 3. A valve 8 is arranged in the valve guide 7.

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, and the six 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 head, 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, there are six ribs 6, which are a first rib 61, a second rib 62, a third rib 63, a fourth rib 64, a fifth rib 65, and a sixth rib 66.

In the present embodiment, the first bolt hole lug 41 is connected to the first valve guide lug 51 by the first reinforcing rib 61. The second bolt hole lug 42 is connected to the second valve guide lug 52 by a second stiffener 62. The third bolt hole lug 43 is connected to the second valve guide lug 52 by a third reinforcing rib 63. The fourth bolt hole lug 44 is connected to the third valve guide lug 53 by a fourth stiffener 64. The fifth bolt hole lug 45 is connected with the third valve guide lug 53 through a fifth strengthening rib 65. The sixth bolt hole lug 46 is connected to the fourth valve guide lug 54 by a sixth reinforcing bead 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 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, and the bolt hole lugs are respectively connected with the valve guide lug through reinforcing ribs.

2. The cylinder head of claim 1, wherein the top plate and the bottom plate are integrally formed, an air passage is arranged between the top plate and the bottom plate, a valve guide pipe is arranged on the valve guide lug, and the lower part of the valve guide pipe extends into the air passage.

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

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