Engine oil lubricating system of automobile engine

Abstract

The invention provides an engine oil lubricating system of an automobile engine, and belongs to the technical field of automobile engine structures. According to the system, through the structural design of the oil level gauge, the oil cover and the crankshaft oil duct, the problem that an oil lubrication system in the prior art is high in maintenance burden cost for a target passenger group of a commercial vehicle of a micro-plane / light passenger level is solved. At least two torsion parts are arranged on a dipstick body of the oil dipstick; the ruler body is clockwise twisted for 30-60 degrees at the twisting part; the engine oil cover comprises a cover plug and a cover handle, and external threads are arranged on the outer wall of the cover plug. A first torsion limiting part is arranged on the cover plug, a second torsion limiting part is arranged on the cover handle, and the cover plug and the cover handle are mutually limited in the circumferential direction of the engine oil cover through matching of the first torsion limiting part and the second torsion limiting part. The crankshaft oil duct comprises a main shaft oil duct and a connecting rod oil duct, and the main shaft oil duct is formed in a main journal of the crankshaft and penetrates through the main journal in the radial direction of the main journal; one end of the connecting rod oil duct is communicated with the main shaft oil duct, and the other end is arranged on a connecting rod journal of the crankshaft adjacent to the main journal.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive engine structures, and particularly relates to an engine oil lubrication system for an automotive engine. Background Art

[0002] The engine oil lubrication system of an automotive engine is a key system to ensure the normal operation of the engine. Its core functions are to lubricate, cool, clean, and seal the internal moving parts of the engine through engine oil. Here, lubrication means forming an oil film between moving parts such as pistons, crankshafts, connecting rods, camshafts, and valves to reduce friction and wear on the metal contact surfaces. Cooling means removing the heat generated by the moving parts through the flow of engine oil to prevent the engine from overheating. Cleaning means that the additives and cleaning factors in the engine oil can remove dirt, carbon deposits, and metal debris inside the engine to keep the engine clean. Sealing means that the engine oil fills the gap between the piston and the cylinder wall to enhance the sealing performance, reduce gas leakage, and improve the combustion efficiency. Rust prevention means that the engine oil covers the metal surface to prevent oxidation and rust.

[0003] The main components of the engine oil lubrication system include: an oil sump, located at the bottom of the engine, for storing engine oil; an oil pump, driven by the crankshaft, which pumps out and pressurizes the engine oil from the oil sump and delivers it to various parts of the engine; oil passages, which deliver the engine oil to key parts of the engine, such as the crankshaft main journals, connecting rod journals, camshafts, etc.; an oil dipstick, used to check the oil level to ensure there is enough engine oil in the oil sump; and an oil filler cap, used to seal the oil filler opening to prevent external contaminants from entering the oil sump, ensure the cleanliness of the engine oil, and at the same time prevent the engine oil in the oil sump from leaking out.

[0004] Common problems in the engine oil lubrication system include too low an oil level in the oil sump, resulting in insufficient lubrication, which in turn causes engine overheating or component wear. To address this problem, maintenance personnel need to insert an oil dipstick into the oil sump through the oil dipstick tube of the engine to check the oil level. For commercial vehicles of the minivan / light passenger vehicle class, the oil dipstick tubes on the transversely-mounted gasoline engines they are equipped with are generally bent to adapt to the overall design of the vehicle body. In this case, a new type of oil dipstick described in the Chinese utility model patent with the authorization announcement number CN201635798U can be selected. The body of this oil dipstick is made of a steel wire rope with good flexibility and toughness, enabling the oil dipstick to be freely inserted and removed in the bent oil dipstick tube. Obviously, the cost of this type of oil dipstick is higher than that of an oil dipstick made of common materials for the body. Considering the target customer group and usage scenarios of minivan / light passenger vehicle class commercial vehicles, when this oil dipstick is damaged or lost and needs to be replaced, the relatively expensive oil dipstick will increase the maintenance burden on users.

[0005] Meanwhile, when the oil level in the oil sump is checked to be too low using the dipstick, the user will add oil to the oil sump through the oil filler port. At this time, it is necessary to unscrew the oil cap. After filling the oil, the oil cap needs to be tightened again. Common metal screw caps not only have poor sealing performance, but also it is difficult for the user to accurately judge whether they are tightened during the screwing process. If not tightened, the sealing effect will be poor. And if tightened too tightly, it will not only damage the threads of the oil cap and cause thread slipping, but also be not conducive to the next oil filling, which also increases the user's maintenance burden.

[0006] The crankshaft is not only the main rotating part of the automotive engine, but also oil passages of the engine oil lubrication system are provided on the crankshaft. The existing lubricating oil passages of the crankshaft are inclined oil passages extending from the main journal to the connecting rod journal. In order to ensure that the engine oil can smoothly enter the inclined oil passage, oil grooves need to be provided on both the upper bearing shell and the lower bearing shell of the main journal. Since the lower bearing shell bears greater pressure, its strength will be reduced after the oil groove is provided on it. In order to ensure the reliable operation of the lower bearing shell, it is necessary to select materials with better performance to make the lower bearing shell, which is obviously not a good choice for commercial vehicles in the microvan / light bus category with strict cost control. And if only the oil groove is provided on the upper bearing shell, the existing inclined oil passage can only supply oil to the connecting rod journal within 180° in the circumferential direction of the crankshaft rotation, and the lubrication effect is insufficient, which is likely to cause mechanical failures of the engine and increase the user's maintenance burden.

[0007] In summary, for the target customer group of commercial vehicles in the microvan / light bus category, the maintenance burden cost of the existing engine oil lubrication system is relatively high. Summary of the Invention

[0008] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an engine oil lubrication system for an automobile, which is used to solve the problem that for the target customer group of commercial vehicles in the microvan / light bus category, the maintenance burden cost of the existing engine oil lubrication system is relatively high.

[0009] To achieve the above purpose and other related purposes, the present invention provides an engine oil lubrication system for an automobile, which lubricates the moving parts inside the engine through engine oil, including:

[0010] An oil sump for storing engine oil, a crankshaft oil passage provided on the engine crankshaft, a dipstick for checking the oil level in the oil sump, and an oil cap for sealing the filling port of the oil sump;

[0011] The dipstick includes a handle and a body. The top end of the body is fixedly connected to the handle, and at least two torsion parts are provided on the body. Looking from the bottom end of the body to the top end of the body, the body is twisted clockwise by 30 - 60° at the torsion part;

[0012] The oil filler cap includes a plug and a handle. An external thread adapted to the internal thread of the filling port of the oil sump is provided on the outer wall of the plug. A torque limiting part one is provided on the plug, and a torque limiting part two is provided on the handle. The plug and the handle are mutually limited in the circumferential direction of the oil filler cap through the cooperation of the torque limiting part one and the torque limiting part two. When the torque applied to the handle drives the torque limiting part one and the torque limiting part two to disengage from each other, the plug and the handle rotate relative to each other.

[0013] The crankshaft oil passage includes a main shaft oil passage and a connecting rod oil passage. The main shaft oil passage is opened on the main journal of the crankshaft and penetrates the main journal along the radial direction of the main journal. One end of the connecting rod oil passage communicates with the main shaft oil passage, and the other end is opened on the connecting rod journal of the crankshaft adjacent to the main journal.

[0014] As described above, an oil lubrication system for an automotive engine of the present invention has at least the following beneficial effects:

[0015] Through the design of setting a torsion part on the ruler body, compared with the prior art that uses a steel wire rope with better flexibility and toughness to make the ruler body, the oil dipstick of the present invention not only adapts to the bent oil dipstick conduit on the engines of microvans / light buses, but also can be made of common oil dipstick materials, such as 65Mn alloy steel with surface galvanized treatment or common stainless steel. During production and subsequent maintenance and replacement, the cost is lower. At the same time, the plug and the handle are mutually limited in the circumferential direction of the oil filler cap through the cooperation of the torque limiting part one and the torque limiting part two. When the torque applied to the handle drives the torque limiting part one and the torque limiting part two to disengage from each other, the design that the plug and the handle rotate relative to each other enables the user to intuitively feel the disengagement of the torque limiting part one and the torque limiting part two when tightening the oil filler cap. Thus, not only can it accurately judge whether the oil filler cap is tightened, but also it can avoid over-tightening the oil filler cap. Moreover, through the design that the main shaft oil passage is opened on the main journal of the crankshaft and penetrates the main journal along the radial direction of the main journal, and one end of the connecting rod oil passage communicates with the main shaft oil passage, and the other end is opened on the connecting rod journal of the crankshaft adjacent to the main journal, when there is no oil groove opened on the lower bearing shell, the crankshaft oil passage can still convey oil to the outer circumferential surface of the connecting rod journal in the circumferential direction of 360° during the rotation of the crankshaft. In summary, through the above structural design, the oil lubrication system for an automotive engine of the present invention solves the problem that the maintenance burden cost of the oil lubrication system in the prior art is relatively high for the target customer group of microvans / light buses. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It shows a schematic diagram of an oil lubrication system for an automotive engine of the present invention.

[0017] Figure 2 It shows a schematic diagram of the oil dipstick of the present invention.

[0018] Figure 3 Shown is an exploded schematic view of the oil filler cap and the filling port of the present invention.

[0019] Figure 4 Shown is a schematic view of the oil filler cap of the present invention.

[0020] Figure 5 Shown is a circumferential sectional view of the oil filler cap of the present invention.

[0021] Figure 6 Shown is an axial sectional view of the oil filler cap of the present invention.

[0022] Figure 7 Shown is a schematic view of the crankshaft and the crankshaft oil passage of the present invention.

[0023] Description of Component Labels

[0024] Oil sump 1, filling port 11;

[0025] Oil dipstick 2, handle 21, body 22, torsion part 23, steel ball 24, solder joint 25;

[0026] Oil filler cap 3, cap plug 31, cap handle 32, ratchet teeth 33, ratchet bar 34, ratchet bar base 35, claw 36, clamping projection 37, torsion table 38, sealing plug 39;

[0027] Oil dipstick conduit 4;

[0028] Crankshaft oil passage 5, main shaft oil passage 51, connecting rod oil passage 52;

[0029] Crankshaft 6, main journal 61, connecting rod journal 62. Detailed Embodiment

[0030] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0031] Please refer to Figures 1 to 7It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are also only for the convenience of clear narration and are not used to limit the scope for the implementation of the present invention. Any change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present invention.

[0032] The following various embodiments are only for illustration purposes. Combinations can be made between the various embodiments, and it is not limited to the content shown in the following single embodiments only.

[0033] Please refer to Figure 1 , the present invention provides an oil lubrication system for an automotive engine. Like the prior art, this lubrication system lubricates the moving parts inside the engine through oil, including:

[0034] As Figure 1 shown, the oil sump 1, which is installed at the bottom of the engine and is used to store oil.

[0035] The oil pump, which is driven by the crankshaft 6, pumps out the oil from the oil sump 1, pressurizes it, and delivers it to various parts of the engine.

[0036] The oil filter, which filters impurities (such as metal debris, dust, carbon deposits) in the oil, is divided into a full-flow filter (filtering all the oil) and a bypass filter (filtering part of the oil).

[0037] The oil cooler, which cools the high-temperature oil to prevent the viscosity of the oil from decreasing or the oil from deteriorating due to overheating. It is usually integrated with the cooling system or uses an independent cooler.

[0038] The oil passages, which deliver the oil to key parts of the engine, such as the main journals 61 of the crankshaft 6, the connecting rod journals 62, the camshaft, etc.; and deliver the oil to specific moving parts, such as pistons, valves, turbochargers, etc.; the oil passages opened on the engine crankshaft 6 are called crankshaft oil passages.

[0039] The oil pressure sensor, which monitors the oil pressure to ensure the normal operation of the lubrication system.

[0040] As Figure 1 and Figure 2 shown, the oil dipstick 2, which is used to check the oil level in the oil sump 1 to ensure that there is enough oil in the oil sump 1.

[0041] As Figure 1 shown, the oil filler cap 3 is used to seal the filling port 11 of the oil sump 1, prevent pollutants from entering the engine interior, ensure the cleanliness of the oil; at the same time, reduce the negative impact of air oxidation on the oil and extend the service life of the oil; in addition, the oil filler cap 3 also ensures that the high-temperature and high-pressure oil during engine operation will not splash or leak from the filling port 11 of the oil sump 1.

[0042] The difference between the oil lubrication system of this automotive engine and the prior art lies in:

[0043] As Figure 2 shown, the dipstick 2 includes a handle 21 and a stick body 22. The top end of the stick body 22 is fixedly connected to the handle 21, and at least two torsion portions 23 are provided on the stick body 22; looking from the bottom end of the stick body 22 towards the top end of the stick body 22, the stick body 22 is twisted clockwise by 30 - 60° at the torsion portion 23; when the user uses the dipstick 2 to insert it into the dipstick conduit 4 to detect the oil level in the oil sump 1, due to the action of at least two torsion portions 23 of the stick body 22 of the dipstick 2, the dipstick 2 can be smoothly bent to adapt to the bent dipstick conduit 4; when the dipstick 2 is pulled out from the dipstick conduit 4, due to the action of the torsion portion 23, the user can also smoothly pull out the dipstick 2; considering that for commercial vehicles of the microvan / light bus level, the dipstick conduit 4 on the transversely-mounted gasoline engine carried by them is not only bent but also relatively long in order to adapt to the overall design of the vehicle body, so the corresponding length of the dipstick 2 is also relatively long, and at least two torsion portions 23 need to be designed to ensure that the dipstick 2 can be smoothly inserted into the dipstick conduit 4 and pulled out from the dipstick conduit 4; compared with the prior art in which the stick body 22 is made of a steel wire rope with better flexibility and toughness, this dipstick 2 not only adapts to the bent dipstick conduit 4 on the engines of commercial vehicles of the microvan / light bus level, but also can be made of common dipstick 2 materials, such as 65Mn alloy steel with surface galvanizing treatment or common stainless steel, and the cost is lower during production and subsequent maintenance and replacement.

[0044] As Figure 3 and Figure 4As shown in the figure, the oil filler cap 3 includes a plug 31 and a handle 32. An external thread adapted to the internal thread of the filling port 11 of the oil sump 1 is provided on the outer wall of the plug 31. A torque limiting part one is provided on the plug 31, and a torque limiting part two is provided on the handle 32. The plug 31 and the handle 32 are mutually limited in the circumferential direction of the oil filler cap 3 through the cooperation of the torque limiting part one and the torque limiting part two. When the torque applied to the handle 32 drives the torque limiting part one and the torque limiting part two to disengage from each other, the plug 31 and the handle 32 rotate relative to each other. The torque that drives the torque limiting part one and the torque limiting part two to disengage from each other is greater than the tightening force when the engine hood is tightened. When the user tightens the oil filler cap 3, they can intuitively feel the disengagement of the torque limiting part one and the torque limiting part two, thereby not only accurately judging whether the oil filler cap 3 is tightened, but also preventing the oil filler cap 3 from being tightened too tightly. The structural design of the oil filler cap 3 enables the user to neither cause poor sealing due to the failure to tighten the oil filler cap 3, nor damage the thread of the oil filler cap 3 and cause thread slipping due to over-tightening, which is not conducive to the next oil filling. The specific structural form of the oil filler cap 3 will be introduced below.

[0045] As Figure 7 shown in the figure, the crankshaft oil passage 5 includes a main shaft oil passage 51 and a connecting rod oil passage 52. The main shaft oil passage 51 is opened on the main journal 61 of the crankshaft 6 and penetrates the main journal 61 along the radial direction of the main journal 61. One end of the connecting rod oil passage 52 communicates with the main shaft oil passage 51, and the other end is opened on the connecting rod journal 62 of the crankshaft 6 adjacent to the main journal 61. The design of the crankshaft oil passage 5 enables the crankshaft oil passage 5 to still convey oil to the outer peripheral surface of the connecting rod journal 62 in the circumferential direction of 360° during the rotation of the crankshaft 6 even if the lower bearing bush does not have an oil groove. Thus, it not only ensures the sufficient lubrication of the connecting rod journal 62, but also ensures the strength of the lower bearing bush while not using high-cost materials to manufacture the lower bearing bush.

[0046] In summary, through the above structural design, the engine oil lubrication system of this vehicle solves the problem that the maintenance cost of the existing engine oil lubrication system is relatively high for the target customer group of microvans / light buses.

[0047] In another embodiment, please refer to Figure 2, the body 22 is sheet-shaped, and two torsion parts 23 are provided on the body 22, and are respectively located at the 1 / 3 length and 2 / 3 length of the body 22; looking from the bottom end of the body 22 to the top end of the body 22, the body 22 is twisted 45° clockwise at the torsion part 23; the cost of processing the torsion part 23 on the sheet-shaped body 22 is lower; the two torsion parts 23 are respectively located at the 1 / 3 length and 2 / 3 length of the body 22, compared with other arrangement forms, the dimensions are easier to guarantee during processing, and during use, it is also easier to adapt to the bent shape of the dipstick conduit 4; of course, the designer can design the specific position of the torsion part 23 according to the specific shape and size of the dipstick conduit 4, which will not be elaborated here.

[0048] In another embodiment, please refer to Figure 2 , the handle 21 is made of plastic, with low cost and easy procurement; the body 22 is made of stainless steel, which can not only meet the anti-corrosion requirements of the dipstick 2, but also has a relatively low raw material procurement cost; a steel ball 24 is welded to the bottom end of the body 22. After the body 22 is inserted into the oil sump 1, the steel ball 24 contacts the bottom of the oil sump 1. Compared with the direct contact of the body 22, it has a buffering effect, which not only protects the bottom of the oil sump 1 from being damaged, but also protects the body 22 and prevents the body 22 from being worn; a plurality of welding points 25 are welded on the body 22 as liquid level marks. For low-cost minivans / light commercial vehicles, the method of welding the welding points 25 is simple in processing and low in cost.

[0049] In another embodiment, please refer to Figure 2 , a sealing ring is installed at the joint of the handle 21 and the body 22 to prevent oil from leaking out of the dipstick conduit 4.

[0050] In another embodiment, please refer to Figure 2 , an annular hole is provided on the handle 21 for the convenience of the user's operation.

[0051] In another embodiment, please refer to Figures 3 to 6 , we introduce the specific structures of the torque-limiting part one and the torque-limiting part two. The plug 31 is a barrel-shaped structure with a closed bottom and an open top. The torque-limiting part one is a plurality of ratchet teeth 33 provided on the inner wall of the plug 31, and the plurality of ratchet teeth 33 are evenly distributed along the circumferential direction of the plug 31; the torque-limiting part two is a ratchet bar 34 provided on the cap handle 32; the ratchet bar 34 meshes with the ratchet teeth 33; when the user needs to tighten the oil cap 3, such as Figure 5As shown, when the cap handle 32 is rotated clockwise, before it is tightened, the ratchet teeth 33 and the ratchet bar 34 are engaged with each other; when tightened, when the user applies a greater force to rotate the cap handle 32, the ratchet bar 34 and the ratchet teeth 33 disengage from each other, and the cap handle 32 and the cap plug 31 rotate relative to each other. The torsional force applied by the user can no longer be transmitted to the cap plug 31 through the cap handle 32, and the external thread on the outer wall of the cap plug 31 no longer continues to be screwed tightly with the internal thread of the filling port 11; when the ratchet bar 34 rotates to the next ratchet tooth 33, similarly, the two will also disengage; when the user needs to loosen the oil cap 3, as Figure 5 shown, when the cap handle 32 is rotated counterclockwise, because the ratchet bar 34 and the ratchet teeth 33 are of the reverse tooth-shaped structure as shown, when a torsional force exceeding the tightening force is applied, the ratchet bar 34 and the ratchet teeth 33 still remain engaged with each other, so that the oil cap 3 can be loosened smoothly.

[0052] In another embodiment, please refer to Figure 4 and Figure 5 , there are multiple ratchet bars 34, which are fixedly connected to the lower surface of the cap handle 32 at equal intervals along the circumferential direction of the cap handle 32; to ensure the stability of the cooperation between the cap handle 32 and the cap plug 31 when the cap handle 32 is rotated.

[0053] In another embodiment, please refer to Figure 5 , with the central axis of the cap handle 32 as the axis, 6 ratchet bar bases 35 are arranged at equal intervals in a circle at the lower part of the cap handle 32. The ratchet bar bases 35 are fixedly connected to the lower part of the cap handle 32, and the ratchet bar 34 is fixedly connected to the outside of the ratchet bar base 35. The design of the ratchet bar base 35 further ensures the stability of the cooperation between the cap handle 32 and the cap plug 31 when the cap handle 32 is rotated.

[0054] In another embodiment, please refer to Figure 4 and Figure 6 , a claw 36 is arranged on the outside of the cap handle 32, and a convex 37 is arranged radially outward at the top of the cap plug 31. The claw 36 is engaged with the convex 37 in the axial direction of the oil cap 3; to ensure that the cap handle 32 and the cap plug 31 can be axially non-separable and can rotate relative to each other circumferentially.

[0055] In another embodiment, please refer to Figure 6 , there are at least three claws 36, which are arranged at equal intervals along the circumferential direction of the cap handle 32 on the outside of the cap handle 32, so as to ensure that the cap handle 32 and the cap plug 31 can be firmly connected axially without separation; more specifically, the claw 36 can be designed to be 8 or other numbers, which will not be elaborated here.

[0056] In another embodiment, please refer to Figure 3 and Figure 4, a sealing plug 39 is installed between the plug 31 and the filling port 11, further ensuring the sealing effect of the engine oil cap 3.

[0057] In another embodiment, please refer to Figure 3 and Figure 4 , the connection part of the connecting rod oil passage 52 and the main shaft oil passage 51 is on the side of the main shaft oil passage 51 away from the connecting rod journal 62. Since the engine oil pressed out from the oil groove of the upper bearing shell enters one end of the main shaft oil passage 51 on the side away from the connecting rod journal 62, the structural form of this embodiment enables the engine oil entering the main shaft oil passage 51 to enter the connecting rod oil passage 52 faster, and then be sprayed from the connecting rod oil passage 52 onto the connecting rod journal 62 to achieve the lubrication effect.

[0058] In another embodiment, please refer to Figure 7 , the included angle between the central axis of the main shaft oil passage 51 and the central axis of the connecting rod oil passage 52 is 36.26°. The selection of this angle is on the one hand to meet the dimensional requirements of the crankshaft 6 of the microvan / light commercial vehicle engine, and on the other hand, through experimental verification, it also has a good lubrication effect.

[0059] In another embodiment, please refer to Figure 2 , the body 22 of the dipstick is 521 mm long, 4.7 mm wide, and 1 mm thick to meet the dimensional requirements of the engine oil dipstick conduit 4 of the microvan / light commercial vehicle engine.

[0060] In other embodiments, as Figure 4 shown, a torsion platform 38 is fixedly connected to the top of the handle 32 of the cap, and anti-slip patterns are provided on the surface of the torsion platform 38 to facilitate the user to turn the engine oil cap 3.

[0061] In summary, through the structural design of the dipstick 2, the engine oil cap 3, and the crankshaft oil passage 5 in the engine oil lubrication system of the vehicle engine, while adapting to the curved engine oil dipstick conduit 4 of the microvan / light commercial vehicle engine, the cost is lower during production and subsequent maintenance and replacement; the user can accurately judge whether the engine oil cap 3 is tightened and avoid over-tightening the engine oil cap 3; when the oil groove is not provided on the lower bearing shell, the crankshaft oil passage 5 can still convey the engine oil to the outer peripheral surface of the connecting rod journal 62 in the circumferential direction of 360° when the crankshaft 6 rotates; thus solving the problem that the existing engine oil lubrication system has a relatively high maintenance cost for the target customer group of microvan / light commercial vehicles. Therefore, the present invention effectively overcomes the shortcomings in the prior art and has a high industrial utilization value.

[0062] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An engine oil lubrication system for an automobile engine lubricates moving parts inside the engine through engine oil, comprising: An engine oil sump for storing engine oil, a crankshaft oil passage opened on the crankshaft of the engine, an oil dipstick for checking the oil level in the engine oil sump, and an oil cap for sealing the filling port of the engine oil sump, characterized in that: The oil dipstick includes a handle and a dipstick body. The top end of the dipstick body is fixedly connected to the handle, and at least two torsion parts are arranged on the dipstick body; looking from the bottom end of the dipstick body to the top end of the dipstick body, the dipstick body twists clockwise by 30-60° at the torsion part; The oil cap includes a plug and a cap handle. The outer wall of the plug is provided with an external thread adapted to the internal thread of the filling port of the engine oil sump; a first torque-limiting part is arranged on the plug, and a second torque-limiting part is arranged on the cap handle. The plug and the cap handle are mutually limited in the circumferential direction of the oil cap through the cooperation of the first torque-limiting part and the second torque-limiting part; when the torque applied to the cap handle drives the first torque-limiting part and the second torque-limiting part to disengage from each other, the plug and the cap handle rotate relative to each other; The crankshaft oil passage includes a main shaft oil passage and a connecting rod oil passage. The main shaft oil passage is opened on the main journal of the crankshaft and penetrates through the main journal along the radial direction of the main journal; one end of the connecting rod oil passage communicates with the main shaft oil passage, and the other end is opened on the connecting rod journal of the crankshaft adjacent to the main journal.

2. The engine oil lubrication system for an automobile engine according to claim 1, characterized in that: The dipstick body is sheet-shaped, and two torsion parts are arranged on the dipstick body, which are respectively located at the 1 / 3 length position and the 2 / 3 length position of the dipstick body; looking from the bottom end of the dipstick body to the top end of the dipstick body, the dipstick body twists clockwise by 45° at the torsion part.

3. The engine oil lubrication system for an automobile engine according to claim 1, characterized in that: The handle is made of plastic, the dipstick body is made of stainless steel, a steel ball is welded at the bottom end of the dipstick body, and a plurality of welding points are welded on the dipstick body.

4. The engine oil lubrication system for an automobile engine according to claim 1, characterized in that: The plug is a barrel-shaped structure with a closed bottom and an open top. The first torque-limiting part is a plurality of ratchet teeth arranged on the inner wall of the plug, and the plurality of ratchet teeth are equally spaced along the circumferential direction of the plug; the second torque-limiting part is a ratchet bar arranged on the cap handle; both the ratchet bar and the ratchet teeth are reverse teeth and are engaged together.

5. The engine oil lubrication system for an automobile engine according to claim 4, characterized in that: There are a plurality of ratchet bars, which are fixedly connected to the lower surface of the cap handle at equal intervals along the circumferential direction of the cap handle.

6. The engine oil lubrication system for an automobile engine according to claim 1, characterized in that: A claw is arranged on the outer side of the cap handle, and a convex is arranged radially outward on the top of the plug. The claw is engaged with the convex in the axial direction of the oil cap.

7. The engine oil lubrication system for an automobile engine according to claim 1, characterized in that: The connection between the connecting rod oil passage and the main shaft oil passage is on the side of the main shaft oil passage away from the connecting rod journal.

8. The oil lubrication system of an automotive engine according to claim 1, characterized in that: The included angle between the central axis of the main shaft oil passage and the central axis of the connecting rod oil passage is 36.26°.

9. The oil lubrication system of an automotive engine according to claim 1, characterized in that: The length of the ruler body is 521 mm, the width is 4.7 mm, and the thickness is 1 mm.

10. The oil lubrication system of an automotive engine according to claim 1, characterized in that: A torsion table is fixedly connected to the top of the handle of the cover, and anti-slip lines are provided on the surface of the torsion table.

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