Engine crankcase exhaust system and excavator
By introducing a check valve into the engine crankcase exhaust system, the problem of oil leakage in the crankcase exhaust at a large inclination angle is solved, and the effect of reducing lubricating oil liquid loss and extending maintenance cycle is achieved.
Patent Information
- Application Number
- CN202422063651.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-26
AI Technical Summary
When the crawler excavator is working, the leakage of combustible mixed gas in the engine crankcase leads to poor lubricant performance, intensified wear of parts, and may cause abnormal pressure in the crankcase, which in turn leads to the illusion of engine oil leakage and the loss of lubricant oil.
An engine crankcase exhaust system is designed, including an engine, an oil and gas separator and a check valve. By setting a check valve on the oil return pipe of the oil-gas separator, the valve core and spring are used to ensure that the valve is closed when the engine is inclined to prevent the lubricating oil from flowing out.
It effectively prevents oil leakage from the crankcase exhaust at a large inclination angle, reduces the loss of lubricating oil, extends the maintenance cycle, and reduces the cost of the machine.
Smart Images
Figure CN222863483U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, and more specifically to an engine crankcase exhaust system and an excavator. Background Art
[0002] When the engine is running, a small amount of combustible mixed gas and exhaust gas leak into the crankcase through the gap between the piston rings. The combustible mixed gas entering the engine crankcase will deteriorate the performance of the lubricating oil, increase the wear and corrosion of parts, and cause abnormal pressure in the crankcase.
[0003] In order to reduce the adverse effects of the combustible mixed gas in the crankcase on the engine, the crankcase must be connected to the outside for ventilation and exhaust. In existing engines, the crankcase vent hole is set at the top of the engine, connected to the oil-gas separator through a vent pipe, the gas part is discharged to the atmosphere through the exhaust pipe, and the oil part is drained to the crankcase at the bottom of the engine through the oil return pipe.
[0004] Crawler excavators have good stability and can work in various working conditions. They can still work normally when the body has a large inclination angle. When the crawler excavator is equipped with the above-mentioned engine and the body has a large inclination angle, the oil in the crankcase will flow back along the oil return pipe to the oil-gas separator and be discharged from the exhaust pipe under the action of the air pressure in the crankcase, creating the illusion of engine oil leakage. At the same time, the discharge of lubricating oil will increase the loss of lubricating oil, shorten the maintenance cycle, and increase the cost of the machine. Utility Model Content
[0005] The technical problem to be solved by the utility model is that the crankcase exhaust oil leaks when the engine is at a large inclination angle, and an engine crankcase exhaust system and an excavator are provided.
[0006] The utility model provides a technical solution to achieve its purpose: an engine crankcase exhaust system, which includes an engine, an oil-gas separator and a one-way valve, wherein the top of the engine is provided with an air vent connected to the inner cavity of the crankcase, and the lower part is provided with an oil return hole connected to the inner cavity of the crankcase; the air inlet of the oil-gas separator is connected to the air vent through a vent pipe, and the oil discharge port is connected to the oil return hole through the one-way valve and the oil return pipe whose position height is lower than the position height of the oil discharge port.
[0007] In the crankcase exhaust system of the utility model engine, the one-way valve is fixedly installed relative to the engine and is located above the middle of the engine.
[0008] In the crankcase exhaust system of the utility model, the one-way valve comprises a valve body, a valve core which slides vertically up and down in the valve body, and a spring which is installed in the valve body and elastically supports the valve core from bottom to top. Furthermore, when the sliding direction of the valve core of the one-way valve is vertical, the gravity of the valve core is equal to the elastic force of the spring. In the utility model, the vertical direction is the plumb direction when the engine is normally installed on the machine equipment and the machine equipment is parked on the horizontal ground. When the engine is not tilted or slightly tilted, the gravity of the valve core is equivalent to the elastic force of the spring, and the oil separated by the oil-gas separator can easily open the one-way valve and flow back to the engine crankcase along the return oil pipe. When the engine tilts at a large angle, the component force of the gravity of the valve core in the direction of the spring elastic force is less than the spring elastic force, and the spring elastic force pushes the valve core to close the one-way valve, and the oil in the crankcase cannot flow outward along the return oil pipe, thereby preventing the oil from flowing out.
[0009] In the crankcase exhaust system of the engine of the utility model, the one-way valve is arranged on the oil-gas separator, for example, located at the oil discharge port of the oil-gas separator.
[0010] In the crankcase exhaust system of the utility model, the oil return pipe is a rigid pipe. The rigid pipe can support the one-way valve to ensure that its posture remains fixed relative to the engine. The rigid pipe can be a steel pipe or a rubber pipe with a thicker wall.
[0011] In the crankcase exhaust system of the utility model engine, the ventilation pipe is a rigid pipe. The rigid ventilation pipe and the oil return pipe can support and fix the oil-gas separator.
[0012] In the crankcase exhaust system of the utility model engine, the exhaust port of the oil-gas separator is connected with an exhaust pipe extending downward.
[0013] The utility model provides a technical solution for achieving the purpose: an excavator having the above-mentioned engine crankcase exhaust system.
[0014] Compared with the prior art, in the utility model, a one-way valve is arranged on the oil return pipe of the oil-gas separator, which can prevent the lubricating oil in the crankcase from entering the oil-gas separator through the oil return pipe and flowing out when the engine inclination angle is large. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The utility model is a structural schematic diagram of an engine crankcase exhaust system.
[0016] Figure 2 The utility model is a schematic diagram of the structure of a one-way valve in an engine crankcase exhaust system.
[0017] Parts names and serial numbers in the figure:
[0018] Engine 1, oil-gas separator 2, one-way valve 3, valve body 31, valve core 2, spring 33, ventilation pipe 4, oil return pipe 5, exhaust pipe 6. DETAILED DESCRIPTION
[0019] The specific implementation scheme is described below with reference to the accompanying drawings.
[0020] like Figure 1 As shown, the engine crankcase exhaust system in this embodiment includes an engine 1, an oil-gas separator 2 and a one-way valve 3. The engine 1 is provided with an air vent connected to the inner cavity of the crankcase at the top and an oil return hole connected to the inner cavity of the crankcase at the bottom; the air inlet of the oil-gas separator 2 is connected to the air vent through a vent pipe 4, and the oil discharge port is connected to the oil return hole through a one-way valve 3 and an oil return pipe 5 whose height is lower than that of the oil discharge port. The air vent is usually provided on the engine cylinder head, and the oil return port is usually provided on the oil pan.
[0021] In this embodiment, the oil-gas mixture in the engine crankcase is discharged from the vent hole on the top of the engine and enters the oil-gas separator 2 through the vent pipe 4, the separated air is discharged from the exhaust hole of the oil-gas separator 2, and the separated oil flows back into the engine 1 through the oil return pipe 5 and the one-way valve 3. When the engine 1 is tilted with the whole machine, the oil in the engine 1 cannot enter the oil-gas separator 2 along the oil return pipe 5 and then be discharged outside the machine, thus avoiding the false appearance of oil leakage in the engine 1 and reducing the consumption of engine lubricating oil.
[0022] Optionally, the one-way valve 3 is fixedly mounted relative to the engine 1 and is located above the middle of the engine 1. The one-way valve 3 is arranged at this height to prevent the one-way valve 3 from being soaked by the oil in the engine 1 when the engine 1 is in a normal posture.
[0023] Alternatively, if Figure 2 As shown, the one-way valve 3 includes a valve body 31, a valve core 32 that slides vertically up and down in the valve body 31, and a spring 33 installed in the valve body 31 to elastically support the valve core 32. When the sliding direction of the valve core 32 of the one-way valve 3 is vertical, the gravity of the valve core 32 is equal to the elastic force of the spring 33.
[0024] The position height of the one-way valve 3 and the oil return pipe 5 is lower than the position height of the oil discharge port of the oil-gas separator 2, so that the oil separated by the oil-gas separator can flow into the crankcase through the one-way valve 3 and the oil return pipe 5. The one-way valve 3 can be arranged on the oil-gas separator 2, for example, at the oil discharge port of the oil-gas separator 2.
[0025] In this embodiment, the vertical direction is the plumb line direction. When the engine 1 is normally installed on the machine equipment and the machine equipment is parked on the horizontal ground, the sliding direction of the valve core 32 of the one-way valve 3 is the plumb line direction. When the engine 1 is not tilted or slightly tilted, the gravity of the valve core 32 is equivalent to the elastic force of the spring 33, and the oil separated by the oil-gas separator 2 can easily open the one-way valve 3 and flow back to the engine crankcase along the return oil pipe 5. When the engine 1 tilts at a large angle, the component force of the gravity of the valve core 32 in the direction of the spring elastic force is smaller than the spring elastic force, and the spring elastic force pushes the valve core 32 to close the one-way valve 3, and the oil in the crankcase cannot flow outward along the return oil pipe 5, thereby preventing the oil from flowing out.
[0026] Optionally, the oil return pipe 5 is a rigid pipe. The rigid pipe can support the one-way valve 3 to ensure that its posture remains fixed relative to the engine 1. The rigid pipe can be a steel pipe or a rubber pipe with a thicker wall. Furthermore, the vent pipe 4 is a rigid pipe. The oil-gas separator 2 can be supported and fixed by the rigid vent pipe 4 and the oil return pipe 5.
[0027] In the crankcase exhaust system of the engine of the utility model, the exhaust port of the oil-gas separator 2 is connected to an exhaust pipe 6 extending downward. Although the air discharged from the oil-gas separator 2 is separated from the oil-gas, it may still contain a small amount of oil and gas. The air discharged from the oil-gas separator 2 is guided downward through the exhaust pipe 6 to prevent the oil and gas contained in the air discharged from the oil-gas separator 2 from dripping on the engine and causing contamination on the engine surface.
[0028] This embodiment also provides an excavator, the engine of which has the aforementioned engine crankcase exhaust system.
[0029] In this embodiment, a one-way valve 3 is provided on the oil return pipe 5 of the oil-gas separator 2 to prevent the lubricating oil in the crankcase from flowing out of the oil-gas separator through the oil return pipe when the engine has a large inclination angle.
Claims
1. An engine crankcase exhaust system, characterized in that: It includes an engine, an oil-gas separator and a one-way valve; the top of the engine is provided with an air vent connected to the inner cavity of the crankcase, and the lower part is provided with an oil return hole connected to the inner cavity of the crankcase; the air inlet of the oil-gas separator is connected to the air vent through a vent pipe, and the oil discharge port is connected to the oil return hole through the one-way valve and the oil return pipe whose position height is lower than the position height of the oil discharge port.
2. The engine crankcase exhaust system according to claim 1, characterized in that: The one-way valve is fixedly installed relative to the engine and is located above the middle of the engine.
3. The engine crankcase exhaust system according to claim 2, characterized in that: The one-way valve comprises a valve body, a valve core which slides vertically up and down in the valve body, and a spring which is installed in the valve body and elastically supports the valve core from bottom to top.
4. The engine crankcase exhaust system according to claim 3, characterized in that: When the valve core of the one-way valve slides in a vertical direction, the gravity of the valve core is equal to the elastic force of the spring.
5. The engine crankcase exhaust system according to any one of claims 1 to 4, characterized in that: The one-way valve is arranged on the oil-gas separator.
6. The engine crankcase exhaust system according to any one of claims 1 to 4, characterized in that: The oil return pipe is a rigid pipe.
7. The engine crankcase exhaust system according to claim 6, characterized in that: The ventilation tube is a rigid tube.
8. The engine crankcase exhaust system according to claim 1, characterized in that: The exhaust port of the oil-gas separator is connected with an exhaust pipe extending downward.
9. An excavator, characterized in that: An engine crankcase exhaust system according to any one of claims 1 to 8.