Integral mounting structure of cylinder head
By adding auxiliary tightening bolts at the connection between the cylinder head and the crankcase, the problem of oil leakage at the joint part of the lubricating oil passage of the cylinder head of a large-displacement universal gasoline engine and the cylinder surface of the box is solved, and the effect of extending the engine service life and enhancing safety is achieved.
Patent Information
- Application Number
- CN202421425883.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-21
AI Technical Summary
In general-purpose gasoline engines with large displacement and large sizes, the joint part of the cylinder head lubricating oil passage and the crankcase cylinder surface is prone to leak oil due to heat engine deformation, resulting in a shortened engine service life and an increased safety risk.
At the connection between the cylinder head and the crankcase, auxiliary tightening bolts are added to be located outside the lubricating oil inlet passage to enhance the connection tightness and prevent oil leakage.
It effectively reduces the oil leakage at the joint part of the lubricating oil passage and the cylinder surface of the cylinder head of the general-purpose gasoline engine during long-term and high-load operation, extends the service life of the engine and enhances safety.
Smart Images
Figure CN222615444U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of general gasoline engines, in particular to an integral mounting structure of a cylinder head. Background Art
[0002] A gasoline engine is an engine that uses gasoline as fuel to convert internal energy into kinetic energy. The working principle of a gasoline engine is to generate kinetic energy by burning the fuel in the cylinder, driving the piston in the engine cylinder to move back and forth, thereby driving the connecting rod connected to the piston and the crank connected to the connecting rod to make reciprocating circular motion around the center of the crankshaft to output power.
[0003] In conventional general-purpose gasoline engines, the cylinder head of the engine is pressed and fixed to the crankcase cylinder surface by four cylinder head bolts of the same specification, which ensure that the high-pressure and high-temperature gas does not leak when the engine is working, and ensure the stable operation of the engine.
[0004] This structure can meet the needs of the engine in a small displacement engine because the cylinder head is small in size. However, in a large displacement and large size general gasoline engine, the cylinder head will increase in size due to the increase in displacement, and the lubricating oil channel at the upper end of the cylinder head will be far away from the tightened cylinder head bolts. When the engine is running at high load for a long time, the far end of the cylinder head oil channel will be deformed due to thermal engine deformation, which may cause oil leakage, shorten the service life of the engine, and increase the risk of safe use of the engine. Summary of the invention
[0005] In order to solve the above technical problems, the utility model provides an integral installation structure of a cylinder head which has a simple structure and can extend the service life.
[0006] The technical scheme is as follows: an integral installation structure of a cylinder head, including a crankcase and a cylinder head, the crankcase and the cylinder head are provided with bolt holes correspondingly, and a fixing bolt for connection is inserted in the bolt hole, and the key point is that the cylinder head is provided with a cylinder head lubricating oil inlet passage, and a case lubricating oil inlet passage is provided on the crankcase corresponding to the cylinder head lubricating oil inlet passage, and the cylinder head lubricating oil inlet passage and the case lubricating oil inlet passage together constitute a lubricating oil inlet passage, and an auxiliary fixing bolt is inserted on the outside near the lubricating oil inlet passage to connect the cylinder head and the crankcase. With the above structure, an auxiliary fixing bolt is provided on the outside of the lubricating oil inlet passage to connect the cylinder head and the crankcase, which can effectively reduce the probability of oil leakage at the joint between the cylinder head lubricating oil inlet passage and the crankcase cylinder surface when a large-displacement, large-size general-purpose gasoline engine is running under high load.
[0007] Preferably, an auxiliary fixing bolt hole is provided on the cylinder head near the cylinder head lubrication oil inlet passage, a threaded through hole is provided on the crankcase corresponding to the auxiliary fixing bolt hole on the cylinder head, and an auxiliary fixing bolt is passed through the auxiliary fixing bolt hole and the threaded through hole. With the above structure, an auxiliary fixing bolt hole and a threaded through hole are provided near the lubrication oil inlet passage for connection to avoid oil leakage.
[0008] As a preferred embodiment, the number of the fixing bolts is four, and the specification of the auxiliary fixing bolts is smaller than that of the four fixing bolts. With the above structure, the newly added auxiliary fixing bolts play an auxiliary role, and the connection between the cylinder head and the crankcase mainly relies on the fixing bolts. The auxiliary fixing bolts are mainly used to prevent the leakage of the engine oil.
[0009] Preferably, a sealing gasket is also included, the sealing gasket is located between the crankcase and the cylinder head, an oil inlet passage through hole is opened on the sealing gasket corresponding to the lubricating oil inlet passage, an installation through hole is opened on the outside of the oil inlet passage through hole, and the installation through hole corresponds to the auxiliary fixing bolt hole and the threaded through hole. With the above structure, the auxiliary fixing bolt can pass through the safety through hole corresponding to the safety through hole set on the sealing gasket to achieve the connection between the fan cover and the crankcase, and at the same time, it can avoid the occurrence of oil leakage from the safety through hole.
[0010] Preferably, the auxiliary fixing bolt hole on the cylinder head, the threaded through hole on the crankcase and the mounting through hole on the sealing gasket are all located at the edge and protrude outward. With the above structure, the auxiliary fixing bolt is located outside the cylinder head and the crankcase, which is convenient for installing the auxiliary fixing bolt.
[0011] Compared with the prior art, the utility model has the following beneficial effects: simple structure, easy use, quick installation and disassembly, convenient inspection and maintenance by staff, and at the same time can improve the service life of general engines, enhance the safety of engines, and can effectively eliminate or reduce the problem of oil leakage at the joint between the cylinder head lubrication oil channel and the cylinder surface of the box body when large-displacement general gasoline engines are running for a long time and under high load. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model;
[0013] Figure 2 It is a top view of the cylinder head;
[0014] Figure 3 This is a bottom view of the cylinder head;
[0015] Figure 4 A top view of the crankcase. DETAILED DESCRIPTION
[0016] The utility model is further described below in conjunction with embodiments and drawings.
[0017] like Figures 1 to 4 As shown, an integral mounting structure of a cylinder head mainly comprises a crankcase 1 and a cylinder head 2, wherein bolt holes 3 are correspondingly provided on the crankcase 1 and the cylinder head 2, and fixing bolts 4 for connection are penetrated in the bolt holes 3, and a cylinder head lubricating oil inlet passage 8 is provided on the cylinder head 2, and a case lubricating oil inlet passage 11 is provided on the crankcase 1 corresponding to the cylinder head lubricating oil inlet passage 8, and the cylinder head lubricating oil inlet passage 8 and the case lubricating oil inlet passage 11 together constitute a lubricating oil inlet passage 12, and an auxiliary fixing bolt 7 is penetrated on the outer side near the lubricating oil inlet passage 12, which connects the cylinder head 2 and the crankcase 1, so that the cylinder head and the crankcase are tightly connected, and the oil leakage caused by the thermal engine deformation of the far end of the cylinder head oil passage when the engine is operated at high load for a long time on a large-displacement and large-size general-purpose gasoline engine can be avoided.
[0018] An auxiliary fixing bolt hole 5 is provided on the cylinder head 2 near the cylinder head lubricating oil inlet passage 8, and a threaded through hole 6 is opened on the crankcase 1 corresponding to the auxiliary fixing bolt hole 5 on the cylinder head 2. Auxiliary fixing bolts 7 are passed through the auxiliary fixing bolt hole 5 and the threaded through hole 6. The passed auxiliary fixing bolts 7 tightly connect the crankcase 1 and the cylinder head 2 near the lubricating oil inlet passage 12 to avoid oil leakage due to deformation.
[0019] It also includes a sealing gasket 9, which is located between the crankcase 1 and the cylinder head 2. The sealing gasket 9 corresponds to the cylinder head 2 and the crankcase 1. An oil inlet channel through hole 13 is opened on the sealing gasket 9 corresponding to the lubrication oil inlet channel 12, a bolt through hole 14 is provided corresponding to the fixing bolt 4, and an installation through hole 10 is opened on the outer side of the oil inlet channel through hole 13. The installation through hole 10 corresponds to the auxiliary fixing bolt hole 5 and the threaded through hole 6.
[0020] There are four fixing bolts 4, the specifications of the auxiliary fixing bolts 7 are smaller than the four fixing bolts 4, the depth of the threaded through hole 6 opened on the crankcase 1 is smaller than the depth of other bolt holes 3 on the crankcase 1, and its depth corresponds to the specifications of the auxiliary fixing bolts 7.
[0021] The auxiliary fixing bolt 7 passes through the auxiliary fixing bolt hole 5, the mounting through hole 10 and the threaded through hole 6 in sequence. The auxiliary fixing bolt 7 cooperates with the other four fixing bolts 4 to tightly connect the cylinder head 2 and the crankcase 1 together. The purpose of the auxiliary fixing bolt 7 is to effectively prevent the cylinder head lubrication oil inlet passage 8 of the cylinder head from being deformed due to the heat engine when the engine is running at high load for a long time, thereby reducing or eliminating the leakage of the engine oil, thereby further improving the service life of the general engine and enhancing the safety of the engine.
[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.
Claims
1. An integral mounting structure of a cylinder head, comprising a crankcase (1) and a cylinder head (2), wherein the crankcase (1) and the cylinder head (2) are provided with bolt holes (3) respectively, and wherein fixing bolts (4) for connection are passed through the bolt holes (3), wherein the fixing bolts (4) for connection are characterized in that: The cylinder head (2) is provided with a cylinder head lubricating oil inlet passage (8), and a crankcase lubricating oil inlet passage (11) is provided on the crankcase (1) corresponding to the cylinder head lubricating oil inlet passage (8). The cylinder head lubricating oil inlet passage (8) and the crankcase lubricating oil inlet passage (11) together form a lubricating oil inlet passage (12), and an auxiliary fixing bolt (7) is penetrated on the outer side close to the lubricating oil inlet passage (12) to connect the cylinder head (2) and the crankcase (1).
2. The integral mounting structure of the cylinder head according to claim 1, characterized in that: An auxiliary fixing bolt hole (5) is provided on the cylinder head (2) near the cylinder head lubrication oil inlet passage (8); a threaded through hole (6) is provided on the crankcase (1) corresponding to the auxiliary fixing bolt hole (5) on the cylinder head (2); and an auxiliary fixing bolt (7) is inserted into the auxiliary fixing bolt hole (5) and the threaded through hole (6).
3. The integral mounting structure of the cylinder head according to claim 1, characterized in that: The number of the fixing bolts (4) is four, and the specification of the auxiliary fixing bolts (7) is smaller than that of the four fixing bolts (4).
4. The integral mounting structure of the cylinder head according to claim 2, characterized in that: It also includes a sealing gasket (9), the sealing gasket (9) being located between the crankcase (1) and the cylinder head (2), an oil inlet passage through hole (13) being provided on the sealing gasket (9) corresponding to the lubricating oil inlet passage (12), a mounting through hole (10) being provided on the outer side of the oil inlet passage through hole (13), the mounting through hole (10) corresponding to the auxiliary fixing bolt hole (5) and the threaded through hole (6).
5. The integral mounting structure of the cylinder head according to claim 4, characterized in that: The auxiliary fixing bolt hole (5) on the cylinder head (2), the threaded through hole (6) on the crankcase (1), and the mounting through hole (10) on the sealing gasket (9) are all located at the edge and protrude outward.