CN115949484A

CN115949484A - Engine lubricating system

Info

Publication number: CN115949484A
Application number: CN202310048259.2A
Authority: CN
Inventors: 倪伟; 张欣林; 庞淑娟; 姜维; 张士鹏; 周修伟
Original assignee: Wuhu Ekotec Power Assembly Co ltd; Chery Automobile Co Ltd
Current assignee: Wuhu Ekotec Power Assembly Co ltd; Chery Automobile Co Ltd
Priority date: 2023-01-31
Filing date: 2023-01-31
Publication date: 2023-04-11

Abstract

The invention discloses an engine lubricating system which comprises an oil pump, a cylinder cover oil duct structure, a cylinder body oil duct structure, an oil pan oil duct, an oil return duct, an oil cooler and a filter, wherein the oil pump is connected with the cylinder body oil duct structure through a cylinder body longitudinal main oil duct, the cylinder body oil duct structure is connected with the cylinder cover oil duct structure through a cylinder cover main oil duct, the oil cooler is integrated on the oil pump, a piston cooling nozzle oil duct is arranged on the cylinder body oil duct structure, and a control valve for controlling the opening and the closing of the nozzle oil duct is arranged corresponding to the piston cooling nozzle oil duct. The engine lubricating system has the advantages of reasonable design, compact arrangement, low cost, convenient adjustment of the oil pressure of the system and convenient arrangement of the oil circuit of the whole engine; the on-demand oil supply is the primary consideration point of the arrangement of the lubricating oil path, and the PCJ is adopted to control the oil path and spray the oil path as required; the cylinder cover oil passage is supplied according to the requirement, the power consumption loss of the system is reduced, and reasonable lubrication of all parts of the engine can be ensured.

Description

Engine lubricating system

Technical Field

The invention relates to the technical field of engine lubrication, in particular to an engine lubrication system.

Background

The lubricating system is mainly used for conveying lubricating oil to all required parts of the engine to lubricate the surfaces of parts and reduce the abrasion loss of moving parts; simultaneously cooling and cleaning the surface of the part; corrosion prevention and sealing of parts (e.g., internal engine processing, individual parts without surface treatment) at certain locations (e.g., clearance between piston and cylinder wall, clearance between piston ring and ring, and prevention of leakage of mixture and exhaust gas); in addition, the lubricating oil contains acidic substances which can neutralize combustion products and prevent the oxidation and chemical corrosion of the surfaces of the parts. In brief, the lubricating system is used to continuously deliver sufficient clean engine oil with proper temperature to the friction surfaces of all transmission members when the engine is working, and form an oil film between the friction surfaces to realize liquid friction, thereby reducing friction resistance, power consumption and part abrasion, and achieving the purpose of improving the working reliability and durability of the engine. Without lubrication of these surfaces, dry friction will occur between them. Dry friction between metal surfaces not only increases the power consumption of the engine, accelerating wear of the working surfaces of the parts, but may also burn the working surfaces of the parts due to the heat generated by the friction, rendering the engine inoperable.

With the development of automobiles, the running speed of an engine is higher and higher, and the power per liter is higher and higher, so that the requirements of each friction pair on a lubricating system are more and more rigorous, the engine is ensured to meet the requirements of a high-strength engine, and the reliability and the low cost of the lubricating system of the engine are also ensured. It is known that the internal energy of fuel is converted to drive the engine after the fuel enters the engine for combustion, however, not all the work is used for driving the engine to run, because friction exists between the friction pairs of the engine, and the design requirement of a lubricating system is higher and higher in order to reduce the friction and reduce the oil consumption. Especially, along with the tightening of oil consumption and emission of the engine, the lubricating system of the engine has higher and higher requirements, not only is compact in arrangement and low in cost required, but also can ensure reasonable distribution of oil pressure as far as possible on the premise of ensuring various performance requirements of the engine, reduce resistance of an oil passage, meet the requirements of various oil using parts of the engine, and is simple and reliable in design.

The existing engine lubricating system adopts the traditional lubricating oil circuit arrangement technology, and the engine lubricating system is designed into an ancient plate and is not fully balanced in oil consumption requirement of the whole system; and the parts are many, the structure is not compact, and the cost is relatively high.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an engine lubricating system which can ensure reasonable lubrication of all parts of an engine, and has the advantages of compact structure and relatively low cost.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the engine lubricating system comprises an oil pump, a cylinder cover oil duct structure, a cylinder body oil duct structure, an oil pan oil duct, an oil return channel, an oil cooler and a filter, wherein the oil pump is connected with the cylinder body oil duct structure through a longitudinal main oil duct of a cylinder body, the cylinder body oil duct structure is connected with the cylinder cover oil duct structure through a cylinder cover main oil duct, the oil cooler is integrated on the oil pump, a piston cooling nozzle oil duct is arranged on the cylinder body oil duct structure, and a control valve used for controlling the opening and closing of the nozzle oil duct is arranged corresponding to the piston cooling nozzle oil duct.

Further:

the control valve is a normally open PCJ valve.

The cylinder oil duct structure comprises a cylinder main oil duct, a cylinder auxiliary oil duct, a main journal of a through crankshaft and a connecting rod journal which are communicated with each other; the oil supply of the connecting rod neck corresponds to the second cylinder and the fourth cylinder of the crankshaft.

The oil return channel is of a funnel-shaped oil channel structure, the side face of the lower portion of the oil return channel is provided with a hole, and the lower port of the oil return channel is sealed.

The cylinder cover oil duct structure comprises a first bearing cover, a second bearing cover, a roller bearing, a VVT oil duct, a camshaft diameter, a hydraulic tappet and a high-pressure oil pump; the first main bearing cover is an independent bearing cover, the oil way is cast, and the roller bearing is controlled by the diameter of the oil port of the first main bearing cover.

The joint of the filter adopts a hollow bolt, and the joint of the oil filter is flange-screwed on the upper oil pan by the hollow bolt.

The VVT oil passage is double, oil is got through the second bearing lid to the oil of getting of VVT oil passage, and the 90 degrees fuel feeding mode is adopted through VVT's function to the camshaft.

And a cylinder cover transverse oil duct is arranged in the cylinder cover oil duct structure, and a throttling plug is arranged on the cylinder cover transverse oil duct.

The cylinder cover further comprises a supercharger oil passage, and the supercharger oil passage is communicated with the cylinder cover main oil passage.

The oil pump is a fully variable oil pump.

Compared with the prior art, the invention has the following advantages:

the engine lubricating system has the advantages of reasonable design, compact arrangement, low cost, convenient adjustment of the oil pressure of the system and convenient arrangement of the oil circuit of the whole engine; the on-demand oil supply is the primary consideration point of the arrangement of the lubricating oil path, and the PCJ is adopted to control the oil path and spray the oil path as required; the cylinder cover oil passage is supplied according to the requirement, the power consumption loss of the system is reduced, and reasonable lubrication of all parts of the engine can be ensured.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1 is a schematic view of a lubrication system according to the present invention.

Fig. 2 is a schematic diagram of the oil path of the oil pan region according to the present invention.

FIG. 3 is a schematic diagram of the oil path of the cylinder body.

FIG. 4 is a schematic view of the oil orientation for the spindle diameter and the connecting rod diameter of the present invention.

Fig. 5 is a schematic diagram of the oil path of the cylinder head according to the present invention.

FIG. 6 is a schematic view illustrating the oil path of the first bearing cap according to the present invention.

In the figure:

1-full variable oil pump, 2-feedback oil duct, 3-cylinder body longitudinal main oil duct, 4-cylinder body main journal, 5-hydraulic tensioner, 6-cylinder cover main oil duct, 7-throttling plug, 8-roller bearing, 9-VVT oil duct, 10-camshaft shaft diameter, 11-supercharger oil duct, 12-hydraulic tappet, 13-high pressure oil pump, 14-oil return duct, 15-cylinder body main oil duct, 16-cylinder body auxiliary oil duct, 17-through crankshaft main journal, 18-through connecting rod journal, 19-engine oil cooler, 20-oil pan oil duct, 21-oil return closed oil duct, 22-filter, 23-piston cooling nozzle oil duct, 24-PCJ valve, 25-first bearing cover, 26-oil hole and 27-closed channel.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

As shown in fig. 1 to 6, the engine lubricating system includes an oil pump, a cylinder head oil passage structure, a cylinder block oil passage structure, an oil pan oil passage 20, an oil return passage 14, an oil cooler 19, and a filter 22; the oil pump is connected with the cylinder body oil duct structure through a cylinder body longitudinal main oil duct, the cylinder body oil duct structure is connected with the cylinder cover oil duct structure through a cylinder cover main oil duct 6, the oil cooler is integrated on the oil pump, a piston cooling nozzle oil duct 23 is arranged on the cylinder body oil duct structure, and a control valve for controlling the opening and closing of the nozzle oil duct is arranged corresponding to the piston cooling nozzle oil duct; the control valve is preferably a PCJ valve 24.

The cylinder oil duct structure comprises a cylinder main oil duct 15, a cylinder auxiliary oil duct 16, a cylinder main journal 4, a through crankshaft main journal 17 and a through connecting rod journal 18 which are communicated with each other; the cylinder main oil duct and the cylinder auxiliary oil duct are transversely arranged side by side, the oil pump is connected with a cylinder longitudinal main oil duct 3 through a feedback oil duct 2, and a hydraulic tensioner 5 is arranged on the cylinder longitudinal main oil duct; the oil supply of the connecting rod neck corresponds to the second cylinder and the fourth cylinder of the crankshaft. The oil return channel is of a funnel-shaped oil channel structure, the side face of the lower portion of the oil return channel is provided with a hole, and the lower port of the oil return channel is provided with a closed channel 27 to form an oil return closed oil channel 21.

The cylinder cover oil passage structure comprises a first bearing cover 25, a second bearing cover, a roller bearing 8, a VVT oil passage 9, a camshaft diameter 10, a hydraulic tappet 12 and a high-pressure oil pump 13; the first main bearing cover is an independent bearing cover, an oil hole 26 is formed in the bearing cover, the oil way is controlled in a casting mode, and the roller bearing is controlled through the diameter of the oil hole of the first main bearing cover.

And a cylinder cover transverse oil duct is arranged in the cylinder cover oil duct structure, and a throttle plug 7 is arranged on the cylinder cover transverse oil duct. The lubricating system further comprises a supercharger oil channel 11, and the supercharger oil channel is communicated with the cylinder cover main oil channel.

The engine lubricating system has reasonable design, compact arrangement, low cost, convenient adjustment of the oil pressure of the system and convenient arrangement of the oil circuit of the whole engine; the oil supply according to requirements is the primary consideration point of the arrangement of the lubricating oil path, and a PCJ control oil path is adopted for spraying according to requirements; the cylinder cover oil passage is supplied according to the requirement, the power consumption loss of the system is reduced, and reasonable lubrication of all parts of the engine can be ensured.

Preferred embodiments of the present invention are:

the engine oil collector is integrated on the engine oil pump, so that the number of sample pieces and the management cost are reduced, and meanwhile, the number of auxiliary connecting parts is reduced, and the cost is effectively reduced; and more oil passages are treated by adopting a casting mode, so that the oil passages are flexibly designed, and the oil passage processing cost is reduced. The oil pump feedback oil passage, the upper oil bottom case main oil passage, the cylinder cover main oil passage and the like can be optimized according to the oil passage with proper space, so that the processing cost is reduced.

In order to realize accurate control of the cooling nozzle, the opening and closing of the cooling nozzle are controlled through the PCJ valve, the oil injection time of the cooling nozzle is reasonably controlled, and meanwhile, the PCJ control electromagnetic valve is normally open, so that the PCJ valve can not fail and the piston head can still be cooled when an engine fails in a power failure, and the overheating of starting is prevented.

The invention fully considers the oil supply of the connecting rod diameter and the main journal and the oil demand of each part, so as to reasonably lubricate, and the oil taking of the connecting rod comes from 2 and 4 cylinders. Five oil flows to the main shaft diameter of the crankshaft from the main oil gallery of the cylinder body. The cylinder body main oil gallery is horizontally arranged, oil taking positions of four cooling nozzles are from the cylinder body auxiliary oil gallery, a PCJ valve is installed between the main oil gallery and the auxiliary oil gallery, and the injection control of the cooling nozzles is realized through the connection and the disconnection of the PCJ valve.

The invention fully considers the influence of the air content of the engine oil on the performance of the engine, the oil return channel of the cylinder body is designed into a funnel shape, the flow velocity impact of the engine oil flowing back from the cylinder cover is reduced as much as possible, the lower oil pan is positioned at the oil return hole and adopts a sealed channel, and the influence of the air content of the engine oil and the friction work of the engine caused by the falling of the oil of the circulating engine on the crankshaft connecting rod is avoided.

This patent is for reducing the friction loss of cylinder cap camshaft, and first main bearing cap department is through independent bearing cap, and the oil circuit passes through the casting mode, and roller bearing's machine oil demand is realized through the size of the hydraulic fluid port diameter of first main bearing cap, and roller bearing's reliability is satisfied.

This patent is arranged for two VVT oil ducts, and the getting oil of VVT oil duct is got oil through second main bearing cap department, and the oil duct derives from the main oil duct, and the camshaft adopts 90 degrees fuel feeding modes through VVT's function, and furthest has guaranteed the sufficiency of VVT fuel feeding. Ensuring sufficient oil supply of the VVT; in the cylinder cover transverse oil passage, by adding the throttling plug, the oil supply through the hydraulic tappet and the high-pressure oil pump is reduced after the throttling hole.

The oil is taken from the main oil duct of the cylinder cover by the supercharger, so that the length of a pipeline of the supercharger is effectively reduced, the pressure loss of the oil duct is small, and the system arrangement is simpler.

The oil filter joint disclosed by the invention is arranged by adopting the hollow bolt, so that the arrangement space of an oil way is saved, and the oil filter joint bolt flange at the position is screwed on the upper oil pan, so that the screwing and fixing effects are also realized. Additional bolts are saved. The oil pan adopts the layer-stepping oil pan, and the machine is strained and is connect and pass last oil pan.

The upper part of the first main bearing cover is divided into the exhaust side bearing pair into an integral structure, so that the coaxiality of all shaft diameters of the mounted camshaft can be effectively guaranteed, and the eccentric wear problem of all bearing pairs of the camshaft can be effectively reduced.

The oil pump is a fully variable oil pump 1, and the pressure of the main oil gallery is timely and accurately communicated to the oil pump feedback oil passage end through the arrangement mode of main oil gallery feedback.

The main oil duct of the system is directly connected with an oil inlet duct of the tensioner, so that the requirement of oil supply for the chain tensioner is met.

The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.

The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the above embodiments, and it is within the scope of the invention to use the concept and technical solution of the invention in other fields without substantial or direct modification.

Claims

1. The utility model provides an engine lubrication system, includes oil pump, cylinder cap oil duct structure, cylinder body oil duct structure, oil pan oil duct, oil return, oil cooler and filter, the oil pump passes through the vertical main oil duct of cylinder body and links to each other with cylinder body oil duct structure, links to each other its characterized in that through cylinder cap main oil duct between cylinder body oil duct structure and the cylinder cap oil duct structure: the oil cooler is integrated on the oil pump, the cylinder oil duct structure is provided with a piston cooling nozzle oil duct, and a control valve for controlling the opening and closing of the nozzle oil duct is arranged corresponding to the piston cooling nozzle oil duct.

2. The engine lubrication system of claim 1, wherein: the control valve is a normally open PCJ valve.

3. The engine lubrication system of claim 1, wherein: the cylinder body oil passage structure comprises a cylinder body main oil passage, a cylinder body auxiliary oil passage, a main journal of a through crankshaft and a through connecting rod journal which are communicated with each other; the oil supply of the connecting rod neck corresponds to the second cylinder and the fourth cylinder of the crankshaft.

4. The engine lubrication system of claim 1, wherein: the oil return passage is of a funnel-shaped oil passage structure, the side face of the lower portion of the oil return passage is provided with a hole, and the lower port of the oil return passage is sealed.

5. The engine lubrication system of claim 1, wherein: the cylinder cover oil duct structure comprises a first bearing cover, a second bearing cover, a roller bearing, a VVT oil duct, a camshaft diameter, a hydraulic tappet and a high-pressure oil pump; the first main bearing cover is an independent bearing cover, the oil way is controlled in a casting mode, and the roller bearing is controlled through the diameter of an oil port of the first main bearing cover.

6. The engine lubrication system of claim 1, wherein: the joint of the filter adopts a hollow bolt, and the joint of the oil filter is flange-screwed on the upper oil pan by the hollow bolt.

7. The engine lubrication system of claim 5, wherein: the VVT oil passage is double, oil is got through the second bearing lid to the oil of getting of VVT oil passage, and the 90 degrees fuel feeding mode is adopted through VVT's function to the camshaft.

8. The engine lubrication system of claim 5, wherein: and a cylinder cover transverse oil duct is arranged in the cylinder cover oil duct structure, and a throttling plug is arranged on the cylinder cover transverse oil duct.

9. The engine lubrication system of claim 5, wherein: the cylinder cover oil gallery is communicated with the cylinder cover main oil gallery.

10. The engine lubrication system as recited in any one of claims 1 through 9, wherein: the oil pump is a fully variable oil pump.