Engine lubrication system

Abstract

The utility model discloses an engine lubricating system, which is characterized in that an engine comprises a shell, a crankshaft and a camshaft, the engine lubricating system comprises an engine oil inlet formed in the shell, a low-pressure oil duct arranged on the shell, an engine oil pump, a high-pressure oil duct arranged on the shell, a crankshaft oil duct structure arranged on a crankshaft and a camshaft oil duct structure arranged on a camshaft. The low-pressure oil duct is communicated with the engine oil inlet; an inlet of the oil pump is communicated with the low-pressure oil duct; the high-pressure oil duct comprises a first oil duct and a second oil duct, and the first oil duct is communicated with an outlet of the oil pump; inlets of the crankshaft oil duct structure and the second oil duct are respectively communicated with the first oil duct; and the camshaft oil duct structure is communicated with the second oil duct. The engine can well lubricate and cool all parts in the engine, the oil way is reasonable in design, and normal and stable operation of the engine is guaranteed.

Description

Technical Field

[0001] The utility model relates to an engine lubrication system and belongs to the technical field of engines. Background Art

[0002] At present, during the operation of the engine, multiple components in the casing need to be lubricated to ensure the normal and smooth operation of the engine; Chinese patent with publication number CN202810998U discloses a lubrication system for a V-type engine, and Chinese patent with publication number CN101943038A discloses an installation and lubrication structure for a diesel engine camshaft. Both patents are lubrication structures for the engine, but there are many oil passages, which are not very convenient to use. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an engine lubrication system, which can well realize the lubrication and cooling of various parts inside the engine, and the oil circuit is reasonably designed to ensure the normal and stable operation of the engine.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: an engine lubrication system, the engine includes a housing, a crankshaft and a camshaft, and the engine lubrication system includes:

[0005] An oil inlet disposed on the housing;

[0006] A low-pressure oil passage is provided on the housing, the low-pressure oil passage is connected to the engine oil inlet;

[0007] an oil pump, wherein an inlet of the oil pump is connected to the low-pressure oil passage;

[0008] A high-pressure oil passage is provided on the housing, the high-pressure oil passage comprises a first oil passage and a second oil passage, the first oil passage is connected to the outlet of the oil pump;

[0009] a crankshaft oil passage structure disposed on the crankshaft, wherein the crankshaft oil passage structure and an inlet of the second oil passage are respectively connected to the first oil passage;

[0010] A camshaft oil passage structure is arranged on the camshaft, and the camshaft oil passage structure is connected with the second oil passage.

[0011] The engine lubrication system further comprises an oil coarse filter, which is connected in the low-pressure oil passage or in a connecting line between the low-pressure oil passage and the oil inlet.

[0012] Furthermore, a method for driving an oil pump to work is provided, wherein the oil pump is connected to the crankshaft, and the rotation of the crankshaft drives the oil pump to work.

[0013] Furthermore, a specific structure of a crankshaft oil passage structure is provided, wherein the crankshaft oil passage structure comprises a crankshaft main journal oil passage, and the crankshaft main shaft diameter oil passage is connected to the first oil passage.

[0014] Furthermore, the crankshaft oil passage structure also includes an internal crankshaft oil passage and at least one crankshaft connecting rod journal oil passage arranged radially along the crankshaft connecting rod shaft, the internal crankshaft oil passage is connected to the crankshaft main journal oil passage, and the crankshaft connecting rod journal oil passage is connected to the internal crankshaft oil passage.

[0015] Furthermore, an annular oil passage arranged along the circumference of the crankshaft main journal is provided between the housing and the crankshaft main journal, the first oil passage is connected to the annular oil passage, and the second oil passage and the crankshaft main journal oil passage are respectively connected to the annular oil passage.

[0016] Furthermore, a specific structure of a camshaft oil passage structure is provided, and the camshaft oil passage structure comprises:

[0017] A camshaft axial passage arranged along the axial direction of the camshaft, wherein the camshaft axial passage is connected to the second oil passage;

[0018] A camshaft shaft end channel is arranged at the axial end of the camshaft and in the radial direction of the camshaft, wherein the camshaft shaft end channel is connected to the camshaft axial channel;

[0019] And / or a camshaft mid-channel arranged in the axial middle of the camshaft and arranged along the radial direction of the camshaft, the camshaft mid-channel is connected with the camshaft axial channel.

[0020] Furthermore, in order to lubricate camshaft accessories, such as camshaft lobes and intake and exhaust tappets, the engine lubrication system also includes a third oil passage and at least one oil spray hole arranged on the housing, wherein the oil spray hole is connected to the third oil passage, and the oil spray hole is suitable for guiding the engine oil to the camshaft accessories.

[0021] Furthermore, the engine lubrication system also includes an oil fine filter, and the oil fine filter is connected to the first oil channel.

[0022] Furthermore, the engine lubrication system also includes an oil radiator, which is connected to the first oil channel.

[0023] Furthermore, a pressure relief valve is provided in the high-pressure oil channel.

[0024] After adopting the above technical scheme, the utility model pumps the engine oil into the crankshaft oil channel structure through the oil pump to lubricate and cool the crankshaft part, and then diverts the engine oil to the camshaft oil channel structure to lubricate and cool the camshaft part. Finally, the engine oil can be diverted to the third oil channel to be sprayed out through the oil injection hole to lubricate and cool the camshaft accessories such as peaches and intake and exhaust tappets. The innovative design has a shorter oil circuit, better processability, and stable oil circuit pressure control, and realizes multifunctional selective lubrication paths such as oil coarse filtration, external oil fine filtration, and external oil radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the engine lubrication system of the first embodiment;

[0026] Figure 2 It is a structural cross-sectional view of the engine lubrication system of the first embodiment;

[0027] Figure 3 It is a structural schematic diagram of the engine lubrication system of the second embodiment;

[0028] Figure 4 This is a schematic diagram of the structure of the engine lubrication system of Example 3. DETAILED DESCRIPTION

[0029] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0030] like Figure 1 , 2 As shown, an engine lubrication system, the engine includes a housing 10, a crankshaft 20 and a camshaft 30. The specific structure of the engine is the prior art and will not be described in detail in this embodiment. In this embodiment, the engine is specifically a V-type engine, and the engine lubrication system includes:

[0031] An oil inlet 1 provided on the housing 10;

[0032] A low-pressure oil passage 2 is provided on the housing 10, and the low-pressure oil passage 2 is connected to the engine oil inlet 1;

[0033] An oil pump 3, the inlet of the oil pump 3 is connected to the low-pressure oil passage 2;

[0034] A high-pressure oil passage is provided on the housing 10, the high-pressure oil passage comprises a first oil passage 4 and a second oil passage 5, the first oil passage 4 is connected to the outlet of the oil pump 3;

[0035] A crankshaft oil passage structure is provided on the crankshaft 20, wherein the crankshaft oil passage structure and the inlet of the second oil passage 5 are respectively connected to the first oil passage 4;

[0036] The camshaft oil passage structure is arranged on the camshaft 30 , and the camshaft oil passage structure is connected to the second oil passage 5 .

[0037] Specifically, in this embodiment, both the low-pressure oil passage 2 and the high-pressure oil passage can be arranged on the chamber cover of the housing 10 .

[0038] In this embodiment, the oil inlet 1 is designed at the bottom of the oil pool of the engine to ensure that the oil in the oil pool can be smoothly absorbed even when the amount of oil is very small.

[0039] like Figure 1 , 2 As shown, the engine lubrication system further includes an oil coarse filter 6, which is connected to the low-pressure oil passage 2, and can also be connected to the connection line between the low-pressure oil passage 2 and the oil inlet 1. The low-pressure oil passage 2 passes through the middle of the oil coarse filter 6, ensuring that the oil first passes through the oil coarse filter 6 to filter impurities inside the oil pool when the oil flows upward in the low-pressure oil passage 2.

[0040] like Figure 1 , 2 As shown, the oil pump 3 is connected to the crankshaft 20, and the rotation of the crankshaft 20 drives the oil pump 3 to operate; specifically, the oil pump 3 includes an oil pump gear, and a timing gear is installed on the crankshaft 20, and the timing gear is meshed and connected with the oil pump gear, so that when the crankshaft 20 rotates, the oil pump 3 is driven to operate through the meshing of the timing gear and the oil pump gear.

[0041] Specifically, Figure 1 , 2 As shown, the crankshaft oil passage structure includes a crankshaft main journal oil passage 71 , and the crankshaft main shaft diameter oil passage 71 is connected to the first oil passage 4 .

[0042] Specifically, Figure 1 , 2 As shown, the crankshaft oil passage structure also includes a crankshaft internal oil passage 72 and at least one crankshaft connecting rod journal oil passage 73 arranged along the radial direction of the crankshaft connecting rod shaft 20a. The crankshaft internal oil passage 72 is connected to the crankshaft main journal oil passage 71, and the crankshaft connecting rod journal oil passage 73 is connected to the crankshaft internal oil passage 72.

[0043] Specifically, Figure 1 , 2 As shown, an annular oil passage 74 arranged along the circumference of the crankshaft main journal 20b is provided between the housing 10 and the crankshaft main journal 20b of the crankshaft 20, the first oil passage 4 is connected to the annular oil passage 74, and the second oil passage 5 and the crankshaft main journal oil passage 71 are respectively connected to the annular oil passage 74. The engine oil in the first oil passage 4 enters the annular oil passage 74, and then enters the second oil passage 5 and the crankshaft main journal oil passage 71.

[0044] Specifically, Figure 1 , 2As shown, the camshaft oil passage structure may be the following structure, including:

[0045] A camshaft axial passage 81 is arranged along the axial direction of the camshaft 30, and the camshaft axial passage 81 is connected to the second oil passage 5;

[0046] A camshaft shaft end passage 82 is disposed at an axial end of the camshaft 30 and in a radial direction of the camshaft 30 , and the camshaft shaft end passage 82 is communicated with the camshaft axial passage 81 .

[0047] Of course, the camshaft oil channel structure may also include a camshaft mid-channel disposed in the axial middle of the camshaft 30 and radially along the camshaft 30 , and the camshaft mid-channel is connected to the camshaft axial channel 81 .

[0048] Specifically, Figure 1 , 2 As shown, a pressure relief valve 60 is provided in the high-pressure oil passage. After the engine oil reaches the oil pump 3 and is pressurized by the oil pump 3, the engine oil flows forward along the high-pressure oil passage at a relatively high pressure inside the oil passage. A pressure relief valve 60 is designed on the high-pressure oil passage to ensure that the high-pressure oil passage does not generate excessive oil pressure.

[0049] Specifically, Figure 1 , 2 As shown, the engine lubrication system further includes a third oil passage 9 and at least one oil injection hole 91 disposed on the housing 10. The oil injection hole 91 is connected to the third oil passage 9 and is suitable for guiding the engine oil to the camshaft accessories.

[0050] In this embodiment, the engine oil enters through the engine oil inlet 1, and then passes through the engine oil coarse filter 6 to filter the impurities inside the oil pool. After being pressurized by the engine oil pump 3, it flows forward along the high-pressure oil channel through the annular oil channel 74 to reach the crankshaft main journal oil channel 71. After the high-pressure engine oil passes through the annular oil channel 74, it is divided into two paths: the first path: along the crankshaft internal oil channel 72, the high-pressure engine oil reaches the crankshaft connecting rod journal oil channel 73 to lubricate the moving friction pair composed of the crankshaft connecting rod journal and the connecting rod bearing, and this lubrication branch ends the lubrication; the second path: along the second oil channel on the chamber cover Channel 5 reaches the camshaft upward and is divided into two branches: the second branch line 1: the high-pressure engine oil flows along the camshaft axial channel 81 to the camshaft shaft end channel 82 at the front shaft end to lubricate it, and the flow channel camshaft small head end (i.e. the rear end camshaft shaft end channel 82) to lubricate the camshaft small head bearing; the second branch line 2: the high-pressure engine oil continues to flow upward along the main oil channel inside the chamber cover (i.e. the third oil channel 9), and is sprayed out through one or more oil injection holes 91 at the upper end of the chamber cover to lubricate the camshaft peach and the moving friction surfaces such as the intake and exhaust braces.

[0051] Embodiment 2

[0052] like Figure 3As shown, the engine lubrication system of this embodiment further includes an oil fine filter 40 on the basis of the first embodiment, and the oil fine filter 40 is connected to the first oil channel 4.

[0053] In this embodiment, after the engine oil is pressurized by the oil pump 3, it flows forward along the high-pressure oil channel to reach the oil inlet of the externally connected rotary oil fine filter 40. The oil filtered by the externally connected rotary oil fine filter 40 reaches the horizontal high-pressure oil channel and flows forward to reach the annular oil channel 74. The subsequent flow path of the engine oil is the same as that in Embodiment 1.

[0054] Embodiment 3

[0055] like Figure 4 As shown, the engine lubrication system of this embodiment further includes an oil radiator 50 on the basis of the second embodiment, and the oil radiator 50 is connected to the first oil passage 4. Specifically, the oil inlet of the oil radiator 50 is connected to the first oil passage 4, the oil outlet of the oil radiator 50 is connected to the oil inlet of the oil fine filter 40, and the oil outlet of the oil fine filter 40 is further connected to the first oil passage 4.

[0056] After being pressurized by the oil pump 3, the engine oil flows forward along the high-pressure oil channel to reach the oil inlet pipe of the oil radiator 50, further to the oil radiator 50, further to the oil outlet pipe of the oil radiator 50, and further to the inlet of the oil fine filter 40. The oil filtered by the oil fine filter 40 reaches the horizontal high-pressure oil channel, flows forward to reach the annular oil channel 74, and the subsequent flow path of the engine oil is the same as that in Example 1.

[0057] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine lubrication system, the engine comprising a housing (10), a crankshaft (20) and a camshaft (30), characterized in that: The engine lubrication system includes: An oil inlet (1) provided on the housing (10); A low-pressure oil passage (2) provided on the housing (10), the low-pressure oil passage (2) being in communication with the engine oil inlet (1); An oil pump (3), the inlet of the oil pump (3) being connected to the low-pressure oil passage (2); A high-pressure oil passage provided on the housing (10), the high-pressure oil passage comprising a first oil passage (4) and a second oil passage (5), the first oil passage (4) being connected to an outlet of the oil pump (3); A crankshaft oil passage structure disposed on the crankshaft (20), wherein the crankshaft oil passage structure and an inlet of the second oil passage (5) are respectively connected to the first oil passage (4); A camshaft oil passage structure is arranged on the camshaft (30), and the camshaft oil passage structure is connected to the second oil passage (5).

2. The engine lubrication system according to claim 1, characterized in that: It also includes an oil coarse filter (6), which is connected in the low-pressure oil passage (2) or in the connection line between the low-pressure oil passage (2) and the oil inlet (1).

3. The engine lubrication system according to claim 1, characterized in that: The oil pump (3) is connected to the crankshaft (20), and the rotation of the crankshaft (20) drives the oil pump (3) to operate.

4. The engine lubrication system according to claim 1, characterized in that: The crankshaft oil passage structure comprises a crankshaft main journal oil passage (71), and the crankshaft main shaft diameter oil passage (71) is connected to the first oil passage (4).

5. The engine lubrication system according to claim 4, characterized in that: The crankshaft oil passage structure also includes a crankshaft internal oil passage (72) and at least one crankshaft connecting rod journal oil passage (73) arranged radially along the crankshaft connecting rod shaft (20a), wherein the crankshaft internal oil passage (72) is connected to the crankshaft main journal oil passage (71), and the crankshaft connecting rod journal oil passage (73) is connected to the crankshaft internal oil passage (72).

6. The engine lubrication system according to claim 4, characterized in that: An annular oil passage (74) is provided between the housing (10) and the crankshaft main journal (20b) of the crankshaft (20) and is arranged along the circumference of the crankshaft main journal (20b); the first oil passage (4) is connected to the annular oil passage (74); and the second oil passage (5) and the crankshaft main journal oil passage (71) are respectively connected to the annular oil passage (74).

7. The engine lubrication system according to claim 1, characterized in that: The camshaft oil passage structure comprises: a camshaft axial channel (81) arranged along the axial direction of the camshaft (30), wherein the camshaft axial channel (81) is connected to the second oil channel (5); a camshaft end channel (82) disposed at an axial end of the camshaft (30) and radially along the camshaft (30), wherein the camshaft end channel (82) is connected to the camshaft axial channel (81); and / or a camshaft mid-channel arranged in the axial middle of the camshaft (30) and radially along the camshaft (30), the camshaft mid-channel being in communication with the camshaft axial channel (81).

8. The engine lubrication system according to claim 1, characterized in that: It also includes a third oil passage (9) and at least one oil injection hole (91) arranged on the housing (10), wherein the oil injection hole (91) is connected to the third oil passage (9), and the oil injection hole (91) is suitable for guiding engine oil to the camshaft accessories.

9. The engine lubrication system according to claim 1, characterized in that: It also includes an engine oil fine filter (40), wherein the engine oil fine filter (40) is connected to the first oil passage (4); And / or also includes an oil radiator (50), wherein the oil radiator (50) is connected to the first oil channel (4).

10. The engine lubrication system according to claim 1, characterized in that: A pressure relief valve (60) is provided in the high-pressure oil passage.

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