Cylinder block assembly, engine, hybrid assembly and vehicle

Abstract

The invention discloses a cylinder block assembly, an engine, a hybrid assembly and a vehicle, and the cylinder block assembly is provided with a first balance shaft cavity suitable for installing a first balance shaft; the crankshaft cavity is suitable for mounting a crankshaft; the ventilation pipeline is communicated with the crankshaft cavity and is used for discharging oil gas in the crankshaft cavity; wherein the first balance shaft cavity is configured as a part of the ventilation pipeline. According to the air cylinder body assembly, the first balance shaft cavity is formed in the ventilation pipeline, oil gas in the crankshaft cavity is led into the first balance shaft cavity through the negative pressure effect of the ventilation pipeline, the first balance shaft and the bearing are lubricated, the structure is simple, an independent oil way does not need to be additionally arranged, the displacement of an oil liquid pump can be reduced, and the service life of the air cylinder body assembly is prolonged. The whole engine structure can be arranged more compactly, and the manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lubrication of vehicle engines, and in particular to a cylinder block assembly, an engine, a hybrid assembly and a vehicle. BACKGROUND

[0002] With the continuous development of modern automobile technology, the performance and comfort requirements of engines are becoming higher and higher. In order to improve the smoothness of the engine and reduce vibration and noise, a balance shaft system is introduced in many engine designs. The balance shaft offsets the inertial force generated during engine operation, thereby significantly improving the smoothness and driving comfort of the engine.

[0003] The smooth operation of the balance shaft depends on the performance of its bearing, and the lubrication of the balance shaft bearing is one of the key factors to ensure its normal operation. Insufficient lubrication will cause increased wear and tear, etc. In the related art, the lubrication of the balance shaft bearing often needs to be independently configured with a special oil line system. Therefore, during power transmission, part of the kinetic energy of the power source will inevitably be consumed due to the additional oil line driving demand, thereby affecting the overall energy utilization efficiency of the engine, and there is room for improvement. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a cylinder block assembly which can effectively lubricate the balance shaft and the bearing, and has a simple structure.

[0005] The present application also provides an engine.

[0006] The present application also provides a hybrid assembly.

[0007] The present application also provides a vehicle.

[0008] According to the cylinder block assembly of the present application, the first balance shaft cavity is adapted to install the first balance shaft, the crankshaft cavity is adapted to install the crankshaft, and the ventilation pipeline is in communication with the crankshaft cavity and is used to discharge oil gas in the crankshaft cavity. The first balance shaft cavity is configured as part of the ventilation pipeline.

[0009] According to the cylinder block assembly of the present application, by arranging the first balance shaft cavity on the ventilation pipeline, the oil gas in the crankshaft cavity is introduced into the first balance shaft cavity by the negative pressure effect of the ventilation pipeline, thereby lubricating the first balance shaft and the bearing. The structure is simple, no additional separate oil line is needed, the oil pump displacement can be reduced, the whole engine structure can be arranged more compactly, and the manufacturing cost can be reduced.

[0010] In some embodiments, the cylinder block assembly has a communication port, and the crankshaft cavity and the first balance shaft cavity are in communication through the communication port.

[0011] In some embodiments, the cylinder block assembly further comprises a plurality of pistons connected to the crankshaft in the crankshaft cavity through connecting rods, wherein a plurality of chambers corresponding to the plurality of pistons are provided in the crankshaft cavity, each of the chambers is in communication with the first balance shaft cavity, at least two adjacent pistons have opposite directions of movement, a pressure difference is formed between the chambers corresponding to the at least two adjacent pistons having opposite directions of movement, and the chambers corresponding to the at least two adjacent pistons having opposite directions of movement are in communication.

[0012] In some embodiments, the first balance shaft is supported in the first balance shaft cavity by a plurality of first balance shaft bearings, and the chambers corresponding to the at least two adjacent pistons having opposite directions of movement are in communication through a communication passage, and a gap between an inner ring and an outer ring of the first balance shaft bearing forms a part of the communication passage.

[0013] In some embodiments, the first balance shaft is supported in the first balance shaft cavity by a plurality of first balance shaft bearings, and at least one of the communication ports is between two adjacent first balance shaft bearings in an axial direction of the first balance shaft.

[0014] In some embodiments, the first balance shaft is supported in the first balance shaft cavity by a plurality of first balance shaft bearings, and the first balance shaft is sleeved with the plurality of first balance shaft bearings; the first balance shaft assembly further comprises a first protective sleeve sleeved on the first balance shaft, the first protective sleeve is located between two adjacent first balance shaft bearings in an axial direction of the first balance shaft, a first flow guide space is formed between the first protective sleeve and the first balance shaft, a first flow guide hole is provided on the first protective sleeve, a first flow guide cavity is formed between the protective sleeve and an inner wall of the balance shaft cavity, the first flow guide cavity is in communication with the communication port, and the first flow guide cavity is in communication with the first flow guide space through the first flow guide hole.

[0015] In some embodiments, the first flow guide hole comprises a plurality of first flow guide holes, and at least part of the first flow guide holes are arranged in a circumferential direction of the first protective sleeve. In some embodiments, the first balance shaft assembly further comprises a second balance shaft, and the cylinder block assembly further has a second balance shaft cavity and an oil return passage, the second balance shaft is arranged in the second balance shaft cavity, and at least part of the oil return passage is in communication with the second balance shaft cavity so that oil in the oil return passage lubricates a second balance shaft bearing on the second balance shaft.

[0016] In some embodiments, the oil return passage comprises at least one upper oil return section and at least one lower oil return section, the upper oil return section is located above the second balance shaft cavity, the lower oil return section is located below the second balance shaft cavity, and the upper oil return section and the lower oil return section are respectively in communication with the second balance shaft cavity, and the lower oil return section is adapted to communicate with an oil storage space in an oil pan.

[0017] In some embodiments, a plurality of second balance shaft bearings are included, the second balance shaft is supported in the second balance shaft cavity by the plurality of second balance shaft bearings, and in the axial direction of the second balance shaft, at least one of the upper oil return sections is located between two of the second balance shaft bearings.

[0018] In some embodiments, a second protective sleeve is further included, the second protective sleeve is sleeved on the second balance shaft and located between two of the second balance shaft bearings in the axial direction of the second balance shaft, a second flow guide space is formed between the second protective sleeve and the second balance shaft, the second protective sleeve is provided with a second flow guide hole, a second flow guide cavity is formed between the second protective sleeve and the inner wall of the second balance shaft cavity, the second flow guide cavity is respectively in communication with the upper oil return section and the lower oil return section, and the second flow guide cavity is in communication with the second flow guide space through the second flow guide hole.

[0019] In some embodiments, the cylinder block assembly is provided with a communication hole, the upper oil return section and the flow guide cavity are in communication through the communication hole, and in the axial direction of the second balance shaft, the communication hole is arranged in a staggered manner with the second flow guide hole.

[0020] In some embodiments, the second balance shaft bearings comprise a fourth bearing, a fifth bearing, and a sixth bearing, the upper oil return sections comprise a first upper oil return section and a second upper oil return section, the first upper oil return section and the second upper oil return section are arranged in a spaced manner along the axial direction of the second balance shaft, in the axial direction of the second balance shaft, the first upper oil return section is located between the fourth bearing and the fifth bearing, and the second upper oil return section is located between the fifth bearing and the sixth bearing.

[0021] In some embodiments, the oil return passage further comprises a straight-through section, the straight-through section is arranged in a spaced manner with the second balance shaft cavity, and the straight-through section is in communication with the oil storage space of the oil pan.

[0022] In some embodiments, the cylinder block has a first side and a second side arranged oppositely, the ventilation pipeline is located on the first side of the cylinder block, and the oil return passage is located on the second side of the cylinder block.

[0023] In some embodiments, when the engine is placed on a vehicle, the first side of the cylinder block is higher than the second side.

[0024] In some embodiments, a main oil gallery and an oil supply branch are further included, the oil supply branch is in communication with the main oil gallery, and the oil supply branch is in communication with the first balance shaft cavity and the second balance shaft cavity.

[0025] In some embodiments, the first balance shaft cavity includes a first balance shaft bearing cavity for mounting a first bearing provided on the first balance shaft, and the oil supply branch includes a first oil passage, the first balance shaft bearing cavity being in communication with the main oil gallery through the first oil passage.

[0026] In some embodiments, a crankshaft bearing cavity is provided in the crankshaft cavity for mounting a crankshaft bearing supporting a crankshaft, and the first oil passage is in communication with the first balance shaft bearing cavity through the crankshaft bearing cavity.

[0027] In some embodiments, the crankshaft bearing cavity includes a transition oil passage on an outer periphery of the crankshaft bearing, and the first oil passage is in communication with the first balance shaft bearing cavity through the transition oil passage.

[0028] In some embodiments, the second balance shaft cavity includes a second balance shaft bearing cavity for mounting a fourth bearing provided on the second balance shaft, and the oil supply branch includes a second oil passage, the second balance shaft bearing cavity being in communication with the main oil gallery through the second oil passage.

[0029] In some embodiments, the main oil gallery extends along an axial direction of the second balance shaft cavity and is arranged adjacent to the second balance shaft cavity.

[0030] In some embodiments, the first bearing is provided at a first end of the first balance shaft in an axial direction of the first balance shaft, and the first end of the first balance shaft is adapted to be drivingly connected to a crankshaft; and / or, the fourth bearing is provided at a first end of the second balance shaft in an axial direction of the second balance shaft, and the first end of the second balance shaft is adapted to be drivingly connected to a crankshaft.

[0031] The engine according to the embodiments of the present application includes the cylinder block assembly according to the embodiments of the present application, and by adopting the above-mentioned cylinder block assembly, the balance shafts and bearings can be effectively lubricated, thereby reducing the working noise of the engine, improving the working efficiency of the engine, and having small modification to the overall structure of the engine, simple structure, and facilitating the manufacturing of the structures.

[0032] In some embodiments, an oil pan is further included, the oil pan is provided on one side of the crankshaft cavity, and the oil pan has an oil storage space in communication with the crankshaft cavity.

[0033] According to the hybrid assembly of the embodiment of the present application, the engine of the embodiment of the present application is adopted, the balance shaft bearing can be effectively lubricated, the working noise can be reduced, and the working efficiency can be improved.

[0034] According to the vehicle of the embodiment of the present application, the engine of the embodiment of the present application and / or the hybrid assembly of the embodiment of the present application are adopted, the performance and comfort of the vehicle can be improved, the maintenance cost can be reduced, and the reliability of the vehicle can be improved.

[0035] Additional aspects and advantages of the present application will be given, partially in the following description, partially become obvious from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings, in which:

[0037] Figure 1 is a schematic view of a cylinder block assembly according to some embodiments of the present application;

[0038] Figure 2 is a cross-sectional view along line A-A in Figure 1

[0039] Figure 3 is a schematic view of an oil path according to some embodiments of the present application;

[0040] Figure 4 is a schematic view of an oil path according to some other embodiments of the present application;

[0041] Figure 5 is a schematic view of an oil path according to some other embodiments of the present application;

[0042] Figure 6 is a schematic view of an oil path according to some other embodiments of the present application;

[0043] Figure 7 is a cross-sectional view along line B-B in Figure 1

[0044] Figure 8 is a schematic view of a piston movement according to some embodiments of the present application;

[0045] Figure 9 is a schematic view of an oil and gas path of a ventilation system according to some embodiments of the present application;

[0046] Figure 10 is a schematic view of an oil and gas lubrication of a cylinder block assembly according to some embodiments of the present application;

[0047] ​​Figure 11 is a schematic illustration of the flow of blow-by gas for a cylinder block assembly according to some embodiments of the application;

[0048] Figure 12 is a cross-sectional view of a perspective of a cylinder block assembly according to some embodiments of the application;

[0049] Figure 13 is another perspective cross-sectional view of a cylinder block assembly according to some embodiments of the application;

[0050] Figure 14 is Figure 13 is a magnified view of area C in

[0051] Figure 15 is yet another perspective cross-sectional view of a cylinder block assembly according to some embodiments of the application;

[0052] Figure 16 is still another perspective cross-sectional view of a cylinder block assembly according to some embodiments of the application.

[0053] Figure 17 is Figure 16 is a magnified view of area D in

[0054] Figure 18 is a schematic illustration of a vehicle according to embodiments of the application.

[0055] Reference Signs:

[0056] cylinder block assembly 100, engine 200, hybrid assembly 300, vehicle 400,

[0057] Cylinder block 10, first side 10a, second side 10b, balance shaft cavity 11, first balance shaft cavity 1101, second balance shaft cavity 1102, first cavity section 111, second cavity section 112, third cavity section 113, fourth cavity section 114, first balance shaft bearing cavity 115, second balance shaft bearing cavity 116, oil outlet hole 12, oil return passage 13, upper oil return section 131, first upper oil return section 1311, second upper oil return section 1312, lower oil return section 132, first lower oil return section 1321, second lower oil return section 1322, straight section 133, upper straight section 1331, lower straight section 1332, crankshaft cavity 20, cavity chamber 201, communication port 21, first communication port 211, second communication port 212, third communication port 213, fourth communication port 214, flow guide plate 22, oil receiving port 221, balance shaft 30, first balance shaft 301, second balance shaft 302, bearing 31, first balance shaft bearing 31a, second balance shaft bearing 31b, first bearing 311, second bearing 312, third bearing 313, fourth bearing 314, fifth bearing 315, sixth bearing 316, first protective sleeve 32, first flow guide space 321, first flow guide hole 322, first drainage cavity 323, second protective sleeve 33, second flow guide space 331, second flow guide hole 332, second drainage cavity 333,

[0058] Ventilation pipeline 40, main oil passage 50, oil supply branch 51, first oil passage 511, second oil passage 512, crankshaft oil passage 513, transition oil passage 514, piston 60, first piston 61, second piston 62, third piston 63, fourth piston 64. DETAILED DESCRIPTION

[0059] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein like reference numerals identify identical or similar elements throughout the several views. The embodiments described below are merely exemplary and are not intended to limit the application, which is defined only by the appended claims.

[0060] In the description of the application, it is to be understood by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the features defined with "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0061] In the description of the application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0062] The following refers to Figures 1-17 The cylinder block assembly 100 according to an embodiment of the application is described below, which includes the cylinder block 10.

[0063] As Figures 1-17 shown, the cylinder block assembly 100 according to an embodiment of the application includes the crankshaft cavity 20 and the balance shaft cavity 11 for mounting the balance shaft 30, and the crankshaft cavity 20 is for mounting the engine crankshaft.

[0064] The balance shaft 30 is arranged in the balance shaft cavity 11, and the balance shaft 30 is provided with bearings 31, and the balance shaft 30 is supported in the balance shaft cavity 11 through the bearings 31. The oil mist in the crankshaft cavity 20 can enter the balance shaft cavity 11, thereby lubricating the bearings 31 on the balance shaft 30. Specifically, since the crankshaft cavity 20 is communicated with the oil pan, the lubricating oil in the oil pan enters the crankshaft cavity 20. When the engine is running at high speed, the lubricating oil is heated, and the oil mist is volatilized in the crankshaft cavity 20. The crankshaft cavity 20 is communicated with the balance shaft cavity 11, so that the oil mist in the crankshaft cavity 20 can enter the balance shaft cavity 11. The oil mist can condense to form lubricating oil in the balance shaft cavity 11, and the components at the accessory position can be lubricated, for example, the balance shaft 30 and the bearings 31 arranged in the balance shaft cavity 11 are lubricated. In addition, the lubricating oil falling on the crankshaft can also be thrown up by the rotating crankshaft, and part of the thrown-up lubricating oil can also enter the balance shaft cavity 11 to lubricate the balance shaft 30.

[0065] According to the cylinder block assembly 100 of the embodiment of the application, the crankshaft cavity 20 and the balance shaft cavity 11 are communicated, the oil mist in the crankshaft cavity 21 is used to lubricate the balance shaft 30 and the bearings 31, the balance shaft 30 and the bearings 31 can be effectively lubricated, the overall structure of the engine 200 is slightly changed, the structure is simple, and the manufacturing of the structures is facilitated.

[0066] In some specific embodiments, the balance shaft cavity 11 includes a first balance shaft cavity 1101 and a second balance shaft cavity 1102, the balance shaft 30 includes a first balance shaft 301 and a second balance shaft 302, the first balance shaft 301 is arranged in the first balance shaft cavity 1101, the second balance shaft 302 is arranged in the second balance shaft cavity 1102, the bearings 31 on the first balance shaft 301 are first balance shaft bearings 31a, the first balance shaft bearings 31a include three, i.e., a first bearing 311, a second bearing 312 and a third bearing 313, the bearings 31 on the second balance shaft 302 are second balance shaft bearings 31b, and the second balance shaft bearings 31b include three, i.e., a fourth bearing 314, a fifth bearing 315 and a sixth bearing 316.

[0067] Here, the first balance shaft cavity 1101 can be communicated with the crankshaft cavity 20, the second balance shaft cavity 1102 can be communicated with the crankshaft cavity 20, or the first balance shaft cavity 1101 and the second balance shaft cavity 1102 can be both communicated with the crankshaft cavity 20.

[0068] In some specific embodiments, the balance shaft cavity 11 has an oil outlet hole 12, and the crankshaft cavity 20 has multiple connecting ports 21, which are connected to the balance shaft cavity 11, so that the crankshaft cavity 20 is connected to the balance shaft cavity 11 through the connecting ports 21; the connecting ports 21, at least part of the bearings 31, and the oil outlet hole 12 are arranged in sequence in the extension direction of the balance shaft 30, and the oil mist in the crankshaft cavity 20 can pass into the balance shaft cavity 11 through the connecting ports 21, thereby lubricating the bearings 31 on the balance shaft 30. Specifically, because the crankshaft chamber 20 is connected to the oil pan, the lubricating oil in the oil pan will flow into the crankshaft chamber 20. When the engine is running at high speed, the lubricating oil heats up, and volatilized oil mist will be generated in the crankshaft chamber 20. The crankshaft chamber 20 is connected to the balance shaft chamber 11 through the communication port 21, so that the oil mist in the crankshaft chamber 20 can enter the balance shaft chamber 11. The oil mist can condense in the balance shaft chamber 11 to form lubricating oil, which can lubricate the components in the accessory position, such as the balance shaft 30 and bearing 31 installed in the balance shaft chamber 11. In addition, the lubricating oil that falls on the crankshaft can also be thrown up by the rotating crankshaft, and some of the thrown-up lubricating oil can also enter the balance shaft chamber 11 through the communication port 21 to lubricate the balance shaft 30.

[0069] In some examples, in the extension direction of the balance shaft 30, there is a connecting port 21 or multiple connecting ports 21 between two adjacent bearings 31, so that oil mist enters the balance shaft cavity 11 through the connecting port 21, and the lubricating oil can flow along the balance shaft 30 to the bearings 31 to lubricate the bearings 31, thereby reducing friction and wear. By providing a connecting port 21 between two adjacent bearings 31, it is ensured that each bearing 31 can be effectively lubricated.

[0070] In some embodiments, the lowest position of the connecting port 21 is higher than the lowest position of the balance shaft cavity 11, so that the oil mist entering the balance shaft cavity 11 will not flow back into the crankshaft cavity 20. The oil mist in the crankshaft cavity 20 can fully lubricate the bearing 31 and then flow out through the oil outlet 12, thereby improving the lubrication effect.

[0071] like Figures 13-15 As shown, in some specific embodiments, the balance shaft cavity 11 includes multiple cavity segments, such as Figure 15 The first cavity segment 111, the second cavity segment 112, the third cavity segment 113 and the fourth cavity segment 114 are shown, and the connecting port 21 includes the first connecting port 211, the second connecting port 212, the third connecting port 213 and the fourth connecting port 214. The multiple connecting ports 21 correspond one-to-one to the multiple cavity segments. Of course, the balance shaft cavity 11 can also be divided into two or three cavity segments, etc., and each chamber has a connecting port 21. The balance shaft cavity 11 has a part corresponding to each connecting port 21, and the oil mist in the crankshaft cavity 20 can enter the corresponding cavity segment through the connecting port 21.

[0072] The lowest position of each communication port 21 is higher than the lowest position of the corresponding cavity segment, such as Figure 14 and Figure 15 As shown, oil mist can enter the first cavity section 111 through the first connecting port 211. The lowest position of the first connecting port 211 is higher than the lowest position of the first cavity section 111, thereby preventing the condensed lubricating oil from flowing back from the connecting port 21 to the crankshaft cavity 20; correspondingly, the lowest position of the second connecting port 212 is higher than the lowest position of the second cavity section 112, the lowest position of the third connecting port 213 is higher than the lowest position of the third cavity section 113, and the lowest position of the fourth connecting port 214 is higher than the lowest position of the fourth cavity section 114, thereby effectively preventing the condensed lubricating oil from flowing back from the connecting port 21 to the crankshaft cavity 20.

[0073] like Figure 15 As shown, in some embodiments, the oil outlet 12 is located at the lowest position of the balance shaft cavity 11, that is, the heights of the bottom edge of the communication port 21, the bottom wall of the balance shaft cavity 11, and the oil outlet 12 decrease in sequence, as shown in FIG. Figure 15 As shown, along the direction close to the oil outlet 12 (as Figure 15 As shown from back to front, the lowest positions of the multiple cavity segments 111 of the balancing shaft cavity 11 gradually decrease, that is, the oil outlet hole 12 is the lowest point, and the balancing shaft 30 and the bearing 31 in the balancing shaft cavity 11 are both higher than the oil outlet hole 12. Therefore, the lubricating oil in the balancing shaft cavity 11 can be discharged from the oil outlet hole 12 after lubricating the balancing shaft 30 and the bearing 31, thereby preventing the lubricating oil from remaining in the balancing shaft cavity 11, resulting in insufficient lubricating oil supply in other structures and affecting the normal operation of other components.

[0074] Since the lowest position of each cavity segment is lower than the lowest position of the corresponding communication port 21, the oil outlet 12 is lower than the communication port 21, and the lubricating oil formed by the condensation of the oil mist flowing out of the communication port 21 can flow out through the oil outlet 12. Figure 15 As shown, the lubricating oil entering the balance shaft cavity 11 can flow from the back to the front, effectively lubricating the bearing 31, and then out through the frontmost oil outlet 12, without flowing into the crankshaft cavity 20 through the connecting port 21, so that the lubricating oil entering the balance shaft cavity 11 is effectively used. Here, the oil outlet 12 can be connected to the engine oil pan, and the lubricating oil can then flow back to the oil pan for further recycling of the lubricating oil.

[0075] like Figure 15 As shown, in some embodiments, the oil outlet 12 is located at one end of the balance shaft cavity 11 in the axial direction of the balance shaft 30 (e.g. Figures 13-15The lowest positions of the fourth cavity section 114, the third cavity section 113, the second cavity section 112, and the first cavity section 111 gradually decrease from back to front, and the oil outlet hole 12 is located at the lowest position of the first cavity section 11. In the direction from back to front, the connection between two adjacent cavity sections can be stepped or connected by a smooth plane, and the bottom of each cavity section can extend downward from back to front, thereby facilitating the flow of lubricating oil to the oil outlet hole 12, allowing the lubricating oil entering the balance shaft cavity 11 to flow axially along the balance shaft 30, improving the lubrication effect of the balance shaft 30, and eliminating the dead zone of lubricating oil in the entire balance shaft cavity 11.

[0076] As shown in Figure 16 , a plurality of bearings 31 are installed in the plurality of cavity sections, and the lowest positions of the installation positions of the plurality of bearings 31 gradually decrease from back to front. After the lubricating oil lubricates the bearings 31 on the last side, it can flow forward to lubricate the bearings 31 on the front side, thereby maximizing the use of lubricating oil to lubricate the bearings 31.

[0077] After the lubricating oil reaches the bearings 31, during the rotation of the bearings 31, the lubricating oil lubricates between the bearings 31 and the balance shaft 30. During the flow of the lubricating oil, it can also flush out impurities and metal chips inside the bearings 31, keeping the inside of the bearings 31 clean.

[0078] As shown in Figure 17 and Figure 17 , the cylinder block assembly 100 further comprises an oil return passage 13, which can return oil to the crankshaft cavity 20, which is in communication with the oil storage space of the oil pan, thereby allowing the oil to return to the oil pan. The crankshaft cavity 20 includes an oil return area located in the outlet direction of the oil return passage 13, which is in communication with the oil return passage 13, and at least one communication port 21 is communicated into the oil return area and located on the path of the oil flow in the oil return area. That is, the balance shaft cavity 11 can be communicated with the oil return area and the oil return passage 13 through one or more communication ports 21, thereby introducing system oil return into the balance shaft cavity 11, and the rotation of the balance shaft 30 forms oil mist, thereby further lubricating the balance shaft bearings 31 and improving the lubrication effect.

[0079] As shown in Figure 17 , in some embodiments, the cylinder block assembly 100 further comprises a flow guide plate 22 arranged at the communication port 21. The flow guide plate 22 can be an inclined flat plate or an arc-shaped plate, and the flow guide plate 22 extends into the oil return area. The flow guide plate 22 can guide the oil in the oil return area to the communication port 21, and under the action of the flow guide plate 22, the flow of the oil into the balance shaft cavity 11 can be facilitated.

[0080] In some examples, the guide plate 22 is connected to the lower edge of the connecting port 21, and the guide plate 22 extends upward from the lower edge of the connecting port 21. The guide plate 22 and the upper edge of the connecting port 21 are arranged at intervals, and an oil receiving port 221 is formed between the guide plate 22 and the upper edge of the connecting port 21. The oil receiving port 221 is connected to the oil return area, that is, the guide plate 22 can play a certain guiding role in the lubricating oil. When part of the lubricating oil in the return oil channel 13 flows downward along the wall and flows to the oil receiving port 221, the guide plate 22 can introduce the lubricating oil into the balance shaft cavity 11, thereby increasing the amount of lubricating oil in the return oil channel 13 entering the balance shaft cavity 11, thereby improving the lubrication effect on the balance shaft bearing 31, and this design structure is simple and low in implementation cost.

[0081] like Figure 13 As shown, in some embodiments, the guide plate 22 forms an arc-shaped plate, and the arc-shaped plate extends along the circumference of the balance shaft 30, thereby better guiding the lubricating oil into the balance shaft cavity 11, and the guide plate 22 can effectively reduce the splash loss of the lubricating oil, ensuring that more lubricating oil can reach the components that need lubrication.

[0082] In some specific examples, along the axial direction of the balancing shaft 30, the oil return area is located at one end of the balancing shaft cavity 11, and the other end of the balancing shaft cavity 11 has an oil outlet hole 12. For example, the oil return channel 13 can be connected to the rear end of the balancing shaft cavity 11 through the fourth connecting port 214, and the front end of the balancing shaft cavity 11 has an oil outlet hole 12. By arranging the oil return channel 13 and the oil outlet hole 12 at both ends of the balancing shaft cavity 11, the lubricating oil flowing out of the oil return channel 13 can flow through all the bearings 31 and then flow out from the oil outlet hole 12, thereby improving the lubrication effect on the bearings 31.

[0083] like Figure 14 and Figure 14 As shown, in some specific examples, a first bearing 311 and a second bearing 312 are provided on the balancing shaft 30, and there is a relatively large distance between the first bearing 311 and the second bearing 312. In order to improve the lubrication effect on the two bearings 31, two connecting ports 21 are provided between the two, namely the first connecting port 211 and the second connecting port 212. In the extension direction of the balancing shaft 30, the first connecting port 211 is close to the first bearing 311, thereby facilitating the lubricating oil introduced into the balancing shaft cavity 11 through the first connecting port 211 to flow to the first bearing 311 in time. The second connecting port 212 is close to the second bearing 312, and the lubricating oil introduced into the balancing shaft cavity 11 through the second connecting port 212 can flow to the second bearing 312 in time, thereby improving the lubrication effect at the bearing 31.

[0084] In addition, compared with opening a large hole between the two bearings 31 , stress can be distributed more evenly, thus avoiding a significant impact on the overall strength of the crankshaft chamber 20 .

[0085] As shown in Figure 14 some embodiments, the balance shaft 30 is further provided with a third bearing 313, the second bearing 312 is located between the first bearing 311 and the third bearing 313, the distance between the second bearing 312 and the first bearing 311 is relatively large, and the distance between the second bearing 312 and the third bearing 313 is relatively small, so that a communication port 21, i.e. a third communication port 213, can be arranged between the second bearing 312 and the third bearing 313 in the extension direction of the balance shaft 30, as shown in Figure 14 the third communication port 213 has one side edge close to the second bearing 312 and the other side edge close to the third bearing 313, so that the lubricating oil introduced into the balance shaft cavity 11 through the third communication port 213 can flow to the second bearing 312 or the third bearing 313, achieving lubrication of the two bearings 31.

[0086] As shown in Figures 13-17 some embodiments, the communication port 21 further includes a fourth communication port 214, which is located on the side of the third bearing 313 away from the second bearing 312 in the extension direction of the balance shaft 30, the fourth communication port 214 is arranged opposite to a part of the balance shaft 30, and the fourth communication port 214 is adjacent to the third bearing 313, so that the lubricating oil introduced into the balance shaft cavity 11 through the third communication port 213 can flow to the second bearing 312 or the third bearing 313, achieving lubrication of the bearings 31.

[0087] As shown in Figures 1-12 some specific embodiments, the balance shaft cavity 11 includes a first cavity section 111, a second cavity section 112, a third cavity section 113, and a fourth cavity section 114, the first cavity section 111, the second cavity section 112, the third cavity section 113, and the fourth cavity section 114 are connected in sequence from front to back, and the lowest positions of the fourth cavity section 114, the third cavity section 113, the second cavity section 112, and the first cavity section 111 gradually decrease, and the lowest position of the first cavity section 111 is provided with an oil outlet hole 12.

[0088] The balance shaft 30 is provided with a first bearing 311, a second bearing 312, and a third bearing 313, the first bearing 311 of the balance shaft 30 is installed in the first cavity section 111, the second bearing 312 is installed in the third cavity section 113, and the third bearing 313 is installed in the fourth cavity section 114.

[0089] The crankshaft cavity 20 has a first communication port 211, a second communication port 212, a third communication port 213, and a fourth communication port 214, the first communication port 211, the second communication port 212, the third communication port 213, and the fourth communication port 214 are arranged in sequence from front to back, and the lowest positions of the plurality of communication ports 21 gradually decrease from back to front.

[0090] Among them, the lowest position of the first communicating port 211 is higher than the lowest position of the first cavity segment 111, the lowest position of the second communicating port 212 is higher than the lowest position of the second cavity segment 112, the lowest position of the third communicating port 213 is higher than the lowest position of the third cavity segment 113, and the lowest position of the fourth communicating port 214 is higher than the lowest position of the fourth cavity segment 114.

[0091] In addition, a guide plate 22 is provided at the fourth connecting port 214. The guide plate 22 is connected to the lower edge of the connecting port 21. The guide plate 22 and the upper edge of the connecting port 21 are arranged at intervals. The guide plate 22 forms an arc-shaped plate and extends from top to bottom toward the direction close to the balance shaft cavity 11. An oil receiving port 221 is formed between the guide plate 22 and the upper edge of the connecting port 21. The oil receiving port 221 is connected to the return oil channel 13.

[0092] Thus, the oil mist in the crankshaft cavity 20 can enter the balance shaft cavity 11 through the four connecting ports 21, and the guide plate can guide part of the lubricating oil in the return oil channel 13 into the balance shaft cavity 11. The cavity sections that are lowered in sequence allow the crankshaft cavity lubricating oil and the lubricating oil in the return oil channel 13 that enter the balance shaft cavity 11 through the fourth connecting port 214 to flow through the third bearing 313, the third cavity section 113, the second bearing 312, the second cavity section 112, and the first bearing 311 in sequence. Similarly, the lubricating oil entering from the fourth connecting port 213, the second connecting port 212 and the first connecting port 211 can also flow from back to front, and finally flow out from the oil outlet 12, so that each bearing 31 is fully lubricated.

[0093] Reference below Figures 1-12 The cylinder block assembly 100 according to some embodiments of the present invention is described below. The cylinder block assembly 100 includes a cylinder block 10. Figure 11 As shown, according to one embodiment of the present invention, the cylinder block assembly 100 is provided with a first balance shaft cavity 1101 , a crankshaft cavity 20 and a ventilation line 40 , and the first balance shaft cavity 1101 is used to install the first balance shaft 301 .

[0094] The crank chamber 20 is where the engine crankshaft is installed. The ventilation line 40 is connected to the crank chamber 20 and is used to discharge the oil and gas in the crank chamber 20. Specifically, the crank chamber 20 has a connecting port 21. When the engine is running, the oil and gas pressure in the crank chamber 20 will increase due to the piston movement and high temperature. The connecting port 21 can discharge these oil and gas to prevent the pressure in the crank chamber 20 from being too high, so that the pressure in the crank chamber can be maintained within a reasonable range, thereby avoiding oil leakage, seal damage, etc.

[0095] The connecting port 21 can be located at the top or side of the crank chamber 20. The ventilation line 40 is connected between the connecting port 21 and the intake system. A PCV valve (positive crank chamber ventilation valve) is provided on the ventilation line 40. The PCV valve can control the flow direction of oil and gas to ensure that oil and gas can only flow from the crank chamber 20 to the intake system.

[0096] The intake system is typically under negative pressure (i.e., below atmospheric pressure) during engine operation, and the pressure within the ventilation line 40 also creates a negative pressure environment. The air pressure within the ventilation line 40 is lower than the air pressure within the crankshaft chamber 20. This negative pressure is utilized to guide the oil and gas within the crankshaft chamber 20 into the intake system. In this embodiment, the first balancer shaft cavity 1101 is configured as part of the ventilation line 40. Specifically, the first balancer shaft cavity 1101 can function as part of the ventilation line 40. Consequently, under the negative pressure of the ventilation line 40, the oil and gas within the crankshaft chamber 20 can flow into the first balancer shaft cavity 1101 and flow toward the outlet of the ventilation line 40. This flow of oil and gas can lubricate the first balancer shaft 301.

[0097] In some examples, such as Figure 11 As shown in FIG. 1 , the oil and gas in the crank chamber 20 may first enter the first balance shaft chamber 1101 and then enter the ventilation line 40; wherein the first balance shaft chamber 1101 and the crank chamber 20 may be directly connected, and an auxiliary line may also be provided between the first balance shaft chamber 1101 and the crank chamber 20, and the auxiliary line is connected between the ventilation line 40 and the crank chamber 20; in other examples, such as Figure 11 As shown in FIG. 2 , a portion of the oil and gas in the crank chamber 20 can directly enter the ventilation line 40, and the other portion can first enter the first balance shaft cavity 1101 and then enter the ventilation line 40; in some other examples, such as Figure 9 As shown in c, the oil and gas in the crankshaft chamber 20 can first enter the upstream of the ventilation line 40, then enter the first balance shaft chamber 1101, and then flow from the first balance shaft chamber 1101 to the downstream of the ventilation line 40.

[0098] The first balancing shaft 301 has a first balancing shaft bearing 31 a . The oil and gas flowing onto the first balancing shaft 301 can flow to the first balancing shaft bearing 31 a to lubricate the first balancing shaft bearing 31 a , thereby reducing friction and wear of the first balancing shaft bearing 31 a .

[0099] According to the cylinder block assembly 100 of the embodiment of the present invention, by arranging the first balance shaft cavity 1101 on the ventilation duct 40, the oil and gas in the crankshaft cavity 20 are passed into the first balance shaft cavity 1101 by utilizing the negative pressure of the ventilation duct 40, so as to lubricate the first balance shaft 301 and the first balance shaft bearing 31a. The structure is simple, and no separate oil circuit is required. The displacement of the oil pump can be reduced, and the entire engine structure can be made more compact, thereby reducing manufacturing costs.

[0100] As shown in Figure 9 , the oil gas entering the first balance shaft cavity 1101 can flow to the cavity end, and the outlet of the ventilation pipeline 40 is at the highest point of the rear end of the cylinder block 10, thereby increasing the oil gas flow path and improving the lubrication effect.

[0101] As shown in Figure 9 , in some embodiments, the engine 200 further comprises an oil pan, and the lower part of the first balance shaft cavity 1101 is open, thereby being in communication with the crank cavity 20, and the oil entering the first balance shaft cavity 1101 can also flow back from the lower part of the first balance shaft cavity 1101 to the crank cavity 20, and then to the oil pan, which can be directly downward to the oil pan, or can flow back to the oil pan through the lower oil return section 132 of the lower part of the second balance shaft cavity 1102.

[0102] In other embodiments, the first balance shaft cavity 1101 has at least one oil outlet hole 12, which can be located at the bottom of the first balance shaft cavity 1101, and the oil outlet hole 12 is in communication with the crank cavity 20 or the oil pan. By providing the oil outlet hole 12, the oil for lubricating the first balance shaft 301 and the first balance shaft bearing 31a can flow to the oil outlet hole 12 under the action of gravity, and then to the oil pan, so as to facilitate the further circulation of the oil.

[0103] As shown in Figure 9 , the first balance shaft cavity 1101 comprises a plurality of cavity sections, such as Figure 8 the first cavity section 111, the second cavity section 112, the third cavity section 113 and the fourth cavity section 114 as shown, and the bottom of each cavity section is open, thereby facilitating the timely flow back of the oil in the cavity section, avoiding the residual lubricating oil in the first balance shaft cavity 1101, causing insufficient lubricating oil supply at other structures, and affecting the normal operation of other components.

[0104] As shown in Figure 9As shown, in some embodiments, the cylinder block assembly 100 further comprises: a plurality of pistons 60 connected to a crankshaft in the crankshaft cavity 20 through connecting rods, wherein at least two adjacent pistons 60 have opposite directions of movement, the crankshaft cavity 20 comprises a plurality of chambers 201 corresponding to the plurality of pistons one-to-one, each chamber 201 is in communication with the first balance shaft cavity 1101, a pressure difference is formed between the chambers 201 corresponding to the two adjacent pistons 60 with opposite directions of movement, and the chambers 201 corresponding to the two adjacent pistons 60 with opposite directions of movement are in communication, so that a pressure difference can be formed between two adjacent regions in the first balance shaft cavity 1101, i.e. using the driving force brought by the opposite directions of movement of the adjacent pistons 60 to make oil gas enter the first balance shaft cavity 1101, so that the oil gas can lubricate the first balance shaft 301 and the first balance shaft bearing 31a in the first balance shaft cavity 1101, further improving the lubrication effect, and the movement of the pistons is used, without the need to separately arrange an oil circuit and a power source, which can further reduce the displacement of the oil pump, and the two adjacent chambers 201 are in communication, so that a vortex can be formed, the oil content in the oil gas is increased, and the lubrication effect is improved.

[0105] In some embodiments, the first balance shaft 301 is supported in the first balance shaft cavity 1101 by a plurality of first balance shaft bearings 31a, the chambers 201 corresponding to the two adjacent pistons 60 with opposite directions of movement are in communication through a communication passage, and the gap between the inner ring and the outer ring of the first balance shaft bearing 31a forms part of the communication passage, i.e. in the axial direction of the first balance shaft 301, the first balance shaft bearing 31a is located between the two adjacent chambers 201, so that the circulating oil gas can again lubricate the first balance shaft bearing 31a.

[0106] In some specific examples, the first balance shaft cavity 1101 comprises a plurality of cavity segments, such as Figure 8 the first cavity segment 111, the second cavity segment 112, the third cavity segment 113, and the fourth cavity segment 114 as shown, the communication port 21 comprises a plurality of, such as Figure 8 the first communication port 211, the second communication port 212, the third communication port 213, and the fourth communication port 214 as shown, the piston 60 comprises a plurality of, such as Figure 8 the first piston 61, the second piston 62, the third piston 63, and the fourth piston 64 as shown.

[0107] As shown, in some embodiments, the cylinder block assembly 100 further comprises: a plurality of pistons 60 connected to a crankshaft in the crankshaft cavity 20 through connecting rods, wherein at least two adjacent pistons 60 have opposite directions of movement, the crankshaft cavity 20 comprises a plurality of chambers 201 corresponding to the plurality of pistons one-to-one, each chamber 201 is in communication with the first balance shaft cavity 1101, a pressure difference is formed between the chambers 201 corresponding to the two adjacent pistons 60 with opposite directions of movement, and the chambers 201 corresponding to the two adjacent pistons 60 with opposite directions of movement are in communication, so that a pressure difference can be formed between two adjacent regions in the first balance shaft cavity 1101, i.e. using the driving force brought by the opposite directions of movement of the adjacent pistons 60 to make oil gas enter the first balance shaft cavity 1101, so that the oil gas can lubricate the first balance shaft 301 and the first balance shaft bearing 31a in the first balance shaft cavity 1101, further improving the lubrication effect, and the movement of the pistons is used, without the need to separately arrange an oil circuit and a power source, which can further reduce the displacement of the oil pump, and the two adjacent chambers 201 are in communication, so that a vortex can be formed, the oil content in the oil gas is increased, and the lubrication effect is improved. Figures 7-10As shown, the movement directions of the two adjacent pistons 60 are opposite. For example, the third piston 63 moves upward and the fourth piston 64 moves downward to compress the oil and gas, so that the pressure of the chamber below the fourth piston 64 is greater than the pressure of the chamber below the third piston 63. The two chambers flow to the fourth cavity section 114 and the third cavity section 113 through the fourth connecting port 214 and the third connecting port 213 respectively. At this time, a pressure difference is formed between the third cavity section 113 and the fourth cavity section 114 on both sides of the third bearing 313, thereby pushing the oil and gas to flow to the low-pressure side. The oil and gas in the fourth cavity section 114 can enter the third cavity section 113 through the first balancing shaft 301 and the third bearing 313, realizing the balance. Lubrication of the third bearing 313; during the operation of the engine, the third piston 63 and the fourth piston 64 constantly switch the direction of movement, the third piston 63 moves downward, and the fourth piston 64 moves upward, which can make the chamber pressure below the third piston 63 greater than the chamber pressure below the fourth piston 64, and then make the oil and gas in the third cavity section 113 enter the fourth cavity section 114 through the first balance shaft 301 and the third bearing 313, thereby achieving effective lubrication of the third bearing 313; correspondingly, the movement directions of the first piston 61 and the second piston 62 are opposite, which can drive the oil and gas into the first balance shaft cavity 1101, thereby achieving lubrication of other components.

[0108] like Figures 7-10 As shown, in some embodiments, the first balance shaft 301 is supported in the first balance shaft cavity 1101 by a plurality of first balance shaft bearings 31a, and the crankshaft cavity 20 has at least one connecting port 21 between two adjacent first balance shaft bearings 31a, thereby facilitating the oil and gas entering the balance shaft cavity 11 through the connecting port 21 to flow to the first balance shaft bearing 31a in a timely manner, thereby improving the lubrication effect at the first balance shaft bearing 31a.

[0109] like Figure 10 As shown, in some embodiments, the cylinder block assembly 100 further includes: a first protective sleeve 32, the first protective sleeve 32 is sleeved on the outside of the first balancing shaft 301, and the first protective sleeve 32 is located between the two first balancing shaft bearings 31a, a first guide space 321 is defined between the first protective sleeve 32 and the first balancing shaft 301, a first guide hole 322 is defined on the first protective sleeve 32, a first guide cavity 323 is formed between the protective sleeve 33 and the inner wall of the balancing shaft cavity 302, the first guide cavity 323 is communicated with the connecting port 21, and the first guide cavity 323 is communicated with the first guide space 321 through the first guide hole 322.

[0110] Specifically, under the negative pressure of the ventilation pipeline 40, the oil gas in the crankshaft cavity 20 enters the first drainage cavity 323 through the communication port 21, then enters the first flow guide space 321 through the first flow guide hole 322 on the first protective sleeve 32, and flows in the first flow guide space 321 towards the ventilation pipeline 40, carrying the oil gas to the first balance shaft bearing 31a to provide lubrication, and the oil liquid passing through the first balance shaft bearing 31a flows back to the oil pan through the oil outlet hole 12.

[0111] The first protective sleeve 32 can prevent the oil gas stirred by the crankshaft from entering the first balance shaft cavity 1101 in extreme working conditions, and the first balance shaft 301 from stirring the oil again, so that more bubbles are mixed into the oil liquid, affecting the lubrication performance of the oil liquid; at the same time, it can avoid the first balance shaft 301 from stirring to form a dense oil mist, causing the load of the crankshaft ventilation system to increase; in addition, it can also prevent the oil liquid at the first balance shaft 301 from being excessive, avoid the oil liquid from returning to the oil pan, which can easily cause vicious cycle and affect the reliability of the engine 200.

[0112] As shown in Figures 1-6 The first flow guide hole 322 includes a plurality of first flow guide holes 322, which are arranged in a circumferential direction of the first protective sleeve 32. By arranging a plurality of first flow guide holes 322, the flow capacity flowing into the first flow guide space 321 can be increased, the waste of lubricating oil can be avoided, and the utilization rate of lubricating oil can be improved. At the same time, the plurality of first flow guide holes 322 are uniformly distributed, so that the oil liquid can flow into the first flow guide space 321 uniformly, and the resistance of the oil liquid in the flow process can be reduced, so that the oil liquid can flow into the first flow guide space 321 more smoothly.

[0113] As shown in Figure 3 In some embodiments, the cylinder block assembly 100 further includes a second balance shaft 302, and the cylinder block 10 further has a second balance shaft cavity 1102 and an oil return passage 13. The second balance shaft 302 is arranged in the second balance shaft cavity 1102, and at least a portion of the oil return passage 13 communicates with the second balance shaft cavity 1102, so that the oil liquid in the oil return passage 13 lubricates the second balance shaft bearing 31b on the second balance shaft 302.

[0114] On the engine 200, the oil pump pumps the lubricating oil from the oil pan and pressurizes it, and then delivers it to each component of the engine through the main oil passage 50. The oil return passage 13 guides the lubricating oil from each component of the engine back to the oil pan to complete the circulation of the oil liquid. By arranging the oil return passage 13, the lubricating oil can be reused, the waste of lubricating oil can be reduced, the inside of the engine can be kept clean, and the performance and reliability of the engine 200 can be improved. The lubricating oil can absorb the heat of the engine components during the return process and be dissipated through the oil pan, which helps to cool the engine. It can be understood that the oil return passage 13 can also be located on other components of the engine 200.

[0115] The oil return channel 13 includes at least one upper oil return section 131, which is located above the second balance shaft cavity 1102. The above here refers to the direction of gravity when the engine 200 is in a working posture. The upper oil return section 131 is connected to the second balance shaft cavity 1102 so that the oil in the oil return channel 13 lubricates the bearings on the second balance shaft 302.

[0116] Specifically, the second balance shaft 302 has a second balance shaft bearing 31b, and the second balance shaft 302 is supported in the second balance shaft cavity 1102 through the second balance shaft bearing 31b. The oil flowing onto the second balance shaft 302 can flow to the second balance shaft bearing 31b to lubricate the second balance shaft bearing 31b, thereby reducing the friction and wear of the second balance shaft bearing 31b.

[0117] By connecting a portion of the return oil channel 13 with the second balance shaft cavity 1102, the oil and oil mist splashing in the return oil channel 13 are used to lubricate the second balance shaft bearing 31b, so that the second balance shaft 302 and the second balance shaft bearing 31b can be effectively lubricated. The structure is simple, and no separate oil circuit is required. The displacement of the oil pump can be reduced, which can make the entire engine structure more compact and reduce manufacturing costs.

[0118] like Figure 3 As shown, in some embodiments, the oil return channel 13 includes at least one lower oil return section 132, the upper oil return section 131 is located above the second balancing shaft cavity 1102, and the lower oil return section 132 is located below the second balancing shaft cavity 1102, and the lower oil return section 132 is connected to the second balancing shaft cavity 1102. The lower oil return section 132 can be directly or indirectly connected to the oil storage space of the oil pan, thereby timely discharging the lubricating oil in the second balancing shaft cavity 11, which can avoid excessive oil lubrication of the second balancing shaft and avoid lubricating oil remaining in the second balancing shaft cavity 11, resulting in insufficient lubricating oil supply in other structures and affecting the normal operation of other components.

[0119] like Figure 3 As shown, in some examples, the number of upper oil return sections 131 and lower oil return sections 132 is the same, and each lower oil return section 132 corresponds to each upper oil return section 131 along the second balance shaft 302, and is relatively arranged on both sides of the second balance shaft 302, as shown in FIG. Figure 3 As shown, the upper oil return section 131 includes a first upper oil return section 1311 and a second upper oil return section 1312, and the lower oil return section 132 includes a first lower oil return section 1321 and a second lower oil return section 1322, wherein the first upper oil return section 1311 and the first lower oil return section 1321 are arranged on both sides of the second balance shaft 302 (as shown in FIG. Figure 3The second upper oil return section 1312 and the second lower oil return section 1322 are arranged on opposite sides of the second balance shaft 302 (as shown on the upper and lower sides), and the first upper oil return section 1311 and the second upper oil return section 1312 are arranged in the axial direction of the second balance shaft 302. Figure 2 By arranging multiple upper oil return sections 131 and multiple lower oil return sections 132, on the one hand, the return flow channel 13 is designed as multiple oil return sections, which can optimize the distribution of oil and improve the uniformity of oil flowing to each position of the second balance shaft cavity 1102, thereby improving the lubrication effect on the second balance shaft bearing 31b on the second balance shaft 302. On the other hand, the lower oil return section 132 is arranged opposite each upper oil return section 131, which is conducive to the rapid return of oil, while reducing the flow resistance of oil during the return process, ensuring that the oil can flow back to the oil sump more smoothly.

[0120] Of course, the number of upper oil return sections 131 and lower oil return sections 132 can also be one each or more.

[0121] In some embodiments, the minimum flow area of the upper oil return section 131 is S1, and the minimum flow area of the lower oil return section 132 is S2. If the flow cross section of the lower oil return section 132 is too small, the oil will not return in time, and if the flow cross section of the lower oil return section 132 is too large, the oil entering the second balance shaft cavity 1102 will flow out of the lower oil return section 132 too quickly, making it difficult to provide sufficient lubrication to the second balance shaft bearing 31b. Therefore, S2 / S1 can be limited to between 1 and 3, and S2 / S1 can be any one of 1, 1.5, 2, 2.5, 3 or a range value between any two of them.

[0122] In this way, by reasonably designing the flow area, the oil can be supplied to each second balance shaft bearing 31b of the second balance shaft 302 as needed, which can ensure that the second balance shaft bearing 31b is sufficiently lubricated, while excess oil can flow back to the oil sump in time, avoiding problems such as excessive oil aeration caused by the second balance shaft 302 agitating the oil, reduced oil pump efficiency, increased engine power consumption, and the like.

[0123] As shown in FIG. 10, the first balance shaft 301 is arranged in the second balance shaft cavity 1102, and the second balance shaft 302 is arranged in the first balance shaft cavity 2102. Figure 3 and Figure 2As shown in some embodiments, the second balance shaft 302 is supported in the second balance shaft cavity 1102 by a plurality of second balance shaft bearings 31b, and in the axial direction of the second balance shaft 302, at least one upper oil return section 131 is in communication with the portion of the second balance shaft cavity 1102 between two second balance shaft bearings 31b, so that oil enters the second balance shaft cavity 1102 through the upper oil return section 131, and the lubricating oil can flow along the second balance shaft 302 to the second balance shaft bearings 31b to lubricate the second balance shaft bearings 31b, thereby reducing friction and wear. By providing the upper oil return section 131 between adjacent two second balance shaft bearings 31b, it is ensured that each second balance shaft bearing 31b can be effectively lubricated.

[0124] As shown in some embodiments, Figure 3 and Figure 2 As shown in some embodiments, the cylinder block assembly 100 further comprises a protective sleeve 33 arranged outside the second balance shaft 302, and in the axial direction of the second balance shaft 302, the protective sleeve 33 is located between two second balance shaft bearings 31b, and a second flow guide space 331 is formed between the protective sleeve 33 and the second balance shaft 302, the protective sleeve 33 is provided with a second flow guide hole 332, and a second drainage cavity 333 is formed between the protective sleeve 33 and the inner wall of the second balance shaft cavity 302, the second drainage cavity 333 is in communication with the upper oil return section 131 and the lower oil return section 132, and the second drainage cavity 333 is in communication with the second flow guide space 331 through the second flow guide hole 332. By providing the protective sleeve 33 with the second flow guide hole 332, the oil in the upper oil return section 131 can flow to the second flow guide hole 332 along the protective sleeve 33 after flowing into the second balance shaft cavity 1102, and then flow into the second flow guide space 331 through the second flow guide hole 332, and flow to the second balance shaft bearing 31b under the rotation of the second balance shaft 302, thereby achieving lubrication of the second balance shaft bearing 31b.

[0125] In addition, under the action of the protective sleeve 33, the oil can be prevented from directly flowing onto the second balance shaft 302, the oil on the second balance shaft 302 can be prevented from being excessive, and the second balance shaft can be prevented from stirring the oil to cause more air bubbles to mix into the oil, which is conducive to maintaining the lubricating performance of the oil.

[0126] In some examples, the cylinder block assembly has a communication hole, the upper oil return section 131 and the drainage cavity 333 are in communication through the communication hole, and in the axial direction of the second balance shaft 302, the communication hole is arranged in a staggered manner with the second flow guide hole 332, so that most of the oil can bypass the second balance shaft 302 and return to the oil storage space of the oil pan.

[0127] As shown in some embodiments, Figure 3 and Figure 3As shown, in some embodiments, the second guide holes 332 include a plurality of second guide holes 332 , which are arranged at intervals along the circumference of the protective sleeve 33 , thereby ensuring that the lubricating oil is evenly distributed in the second balance shaft cavity 1102 .

[0128] By providing a plurality of second guide holes 332, the flow rate into the second guide space 331 can be increased, thereby avoiding waste of lubricating oil and improving the utilization rate of lubricating oil. At the same time, the plurality of second guide holes 332 are evenly distributed, so that the oil can flow evenly into the second guide space 331, and the resistance of the oil during the flow process can be reduced, thereby ensuring that the oil can flow more smoothly into the second guide space 331.

[0129] like Figure 3 As shown, in some examples, the second balancing shaft bearing 31b includes a fourth bearing 314, a fifth bearing 315, and a sixth bearing 316, and the upper oil return section 131 includes a first upper oil return section 1311 and a second upper oil return section 1312. The first upper oil return section 1311 and the second upper oil return section 1312 are arranged at intervals along the axial direction of the second balancing shaft 302. In the axial direction of the second balancing shaft 302, the first upper oil return section 1311 is connected to the portion of the second balancing shaft cavity 1102 located between the fourth bearing 314 and the fifth bearing 315, thereby The oil flowing into the second balance shaft cavity 1102 from the return oil section 1311 can flow to the fourth bearing 314 and the fifth bearing 315, thereby lubricating the fourth bearing 314 and the fifth bearing 315; the second upper return oil section 1312 is connected to the part of the second balance shaft cavity 1102 located between the fifth bearing 315 and the sixth bearing 316, so that the oil flowing into the second balance shaft cavity 1102 from the second upper return oil section 1312 can flow to the fifth bearing 315 and the sixth bearing 316, thereby lubricating the fifth bearing 315 and the sixth bearing 316.

[0130] like Figure 3 As shown, in some examples, in the axial direction of the second balance shaft 302, the protective sleeve 33 is located between the fourth bearing 314 and the fifth bearing 315, and the second guide hole 332 is adjacent to the fifth bearing 315, thereby facilitating the timely flow of oil entering the second guide space 331 to the fifth bearing 315, thereby improving the lubrication effect on the fifth bearing 315. Of course, the second guide hole 332 may also be adjacent to the fourth bearing 314, thereby facilitating the timely flow of oil entering the second guide space 331 to the fourth bearing 314, thereby improving the lubrication effect on the fourth bearing 314.

[0131] like Figure 3As shown, in some examples, the oil return channel 13 also includes a direct current section 133, which is spaced apart from the second balance shaft cavity 1102 and communicates with the oil storage space in the oil pan. That is, a portion of the return channel 13 is not communicated with the second balance shaft cavity 1102, but directly returns to the oil storage space of the oil pan, thereby preventing excessive lubrication oil at the second balance shaft 302 and improving the oil return efficiency, thereby avoiding insufficient lubricating oil supply at other structures and affecting the normal operation of other components.

[0132] like Figure 2 As shown, the DC section 133 includes an upper DC section 1331 and a lower DC section 1332. The upper DC section 1331 and the lower DC section 1332 are directly connected, but the minimum flow areas of the two can be different. On the one hand, it is convenient to form the DC section 133 in the cylinder block 10. On the other hand, it can make full use of the space and facilitate the rapid reflux of oil by reasonably designing the flow area.

[0133] like Figure 2 As shown, in some embodiments, the cylinder block 10 has an oil outlet 12, which is communicated with the second balance shaft cavity 1102, and the oil outlet 12 is communicated with the oil pan. Therefore, the lubricating oil in the second balance shaft cavity 1102 can be discharged from the oil outlet 12 after lubricating the second balance shaft 302 and the second balance shaft bearing 31b, and then the lubricating oil can flow back to the oil pan for further recycling of the lubricating oil. Figure 2 As shown, the oil outlet hole 12 can be connected to the oil pan of the engine through a portion of the oil return channel 13 .

[0134] Among them, along the direction approaching the oil outlet hole 12, the lowest position of the second balancing shaft cavity 1102 gradually decreases, that is, the oil outlet hole 12 is the lowest point, and the second balancing shaft 302 and the second balancing shaft bearing 31b in the second balancing shaft cavity 11 are both higher than the oil outlet hole 12. Therefore, the lubricating oil in the second balancing shaft cavity 1102 can be discharged from the oil outlet hole 12 after lubricating the second balancing shaft 302 and the second balancing shaft bearing 31b, thereby avoiding the lubricating oil remaining in the second balancing shaft cavity 1102, resulting in insufficient lubricating oil supply in other structures, affecting the normal operation of other components.

[0135] like Figure 2 As shown, in some embodiments, the oil outlet hole 12 is located at one end of the second balance shaft cavity 1102 in the axial direction of the second balance shaft 302 (e.g., Figure 2The front end is shown in the figure), the second balance shaft cavity 1102 includes a plurality of cavity segments connected in sequence. Along the direction from back to front, the connection between two adjacent cavity segments can be stepped or connected by a smooth plane. The bottom of each cavity segment can extend downward from back to front, thereby facilitating the flow of lubricating oil to the oil outlet 12, so that the lubricating oil entering the second balance shaft cavity 1102 can flow axially along the second balance shaft 302, thereby improving the lubrication effect on the second balance shaft 302, and there is no dead zone of lubricating oil in the entire second balance shaft cavity 1102.

[0136] like Figures 3-6 As shown, multiple second balancing shaft bearings 31b are installed in multiple cavity segments, and the lowest position of the installation of the multiple second balancing shaft bearings 31b gradually decreases from back to front. After the lubricating oil lubricates the second balancing shaft bearing 31b on the rear side, it can flow forward to lubricate the second balancing shaft bearing 31b on the front side, so that the lubricating oil can be used to lubricate the second balancing shaft bearings 31b to the maximum extent.

[0137] like Figure 4 As shown, in some specific embodiments, the oil return channel 13 includes three independent flow paths, the first section includes a first upper oil return section 1311 and a first lower oil return section 1321, the second section includes a second upper oil return section 1312 and a second lower oil return section 1322, and the third section is a straight section 133. The first upper oil return section 1311 and the second upper oil return section 1312 are respectively connected to the second balance shaft cavity 1102, and the first lower oil return section 1321 and the second lower oil return section 1322 are respectively connected to the second balance shaft cavity 1102. The cavity 1102 is connected, the first upper oil return section 1311 and the first lower oil return section 1321 are relatively arranged on the upper and lower sides of the second balance shaft cavity 1102, the second upper oil return section 1312 and the second lower oil return section 1322 are relatively arranged on the upper and lower sides of the second balance shaft cavity 1102, and the direct current section 133 is arranged outside one end of the second balance shaft cavity 1102. The direct current section 133 is not connected to the second balance shaft cavity 1102, and the direct current section 133 extends roughly vertically, and the lower end extends to the oil pan.

[0138] When the cylinder block assembly 100 lubricates the fifth bearing 315 , the oil return channel 13 can simultaneously lubricate the fifth bearing 315 through the first upper return section 131 and the second upper return section 132 . Specifically, it includes a first lubricating oil liquid path and a second lubricating oil liquid path.

[0139] like Figure 5As shown, the first lubricating oil circuit is: the oil flows through the first upper return section 131 to the protective sleeve 33, and the oil can flow to the second flow guide hole 332 above the protective sleeve 33, and then enters the second flow guide space 331, and under the agitation of the rotating movement of the second balance shaft 302, the oil splashes to the fifth bearing 315 on the second balance shaft 302 to provide lubrication for the fifth bearing 315, and the oil gas brought by the agitation provides lubricating oil for the inside of the fifth bearing 315 through the gap of the fifth bearing 315, and the excess oil in the first upper return section 131 flows back to the oil sump through the first lower return section 1321, and the oil of the fifth bearing 315 flows back to the oil sump through the second lower return section 1322, forming a complete lubrication cycle.

[0140] As shown in FIG. 1, the first lubricating oil circuit is: the oil flows through the first upper return section 131 to the protective sleeve 33, and the oil can flow to the second flow guide hole 332 above the protective sleeve 33, and then enters the second flow guide space 331, and under the agitation of the rotating movement of the second balance shaft 302, the oil splashes to the fifth bearing 315 on the second balance shaft 302 to provide lubrication for the fifth bearing 315, and the oil gas brought by the agitation provides lubricating oil for the inside of the fifth bearing 315 through the gap of the fifth bearing 315, and the excess oil in the first upper return section 131 flows back to the oil sump through the first lower return section 1321, and the oil of the fifth bearing 315 flows back to the oil sump through the second lower return section 1322, forming a complete lubrication cycle. Figure 6 As shown in FIG. 1, the first lubricating oil circuit is: the oil flows through the first upper return section 131 to the protective sleeve 33, and the oil can flow to the second flow guide hole 332 above the protective sleeve 33, and then enters the second flow guide space 331, and under the agitation of the rotating movement of the second balance shaft 302, the oil splashes to the fifth bearing 315 on the second balance shaft 302 to provide lubrication for the fifth bearing 315, and the oil gas brought by the agitation provides lubricating oil for the inside of the fifth bearing 315 through the gap of the fifth bearing 315, and the excess oil in the first upper return section 131 flows back to the oil sump through the first lower return section 1321, and the oil of the fifth bearing 315 flows back to the oil sump through the second lower return section 1322, forming a complete lubrication cycle.

[0141] Figure 1 As shown in FIG. 1, the first lubricating oil circuit is: the oil flows through the first upper return section 131 to the protective sleeve 33, and the oil can flow to the second flow guide hole 332 above the protective sleeve 33, and then enters the second flow guide space 331, and under the agitation of the rotating movement of the second balance shaft 302, the oil splashes to the fifth bearing 315 on the second balance shaft 302 to provide lubrication for the fifth bearing 315, and the oil gas brought by the agitation provides lubricating oil for the inside of the fifth bearing 315 through the gap of the fifth bearing 315, and the excess oil in the first upper return section 131 flows back to the oil sump through the first lower return section 1321, and the oil of the fifth bearing 315 flows back to the oil sump through the second lower return section 1322, forming a complete lubrication cycle.

[0142] As shown in FIG. 1, the first lubricating oil circuit is: the oil flows through the first upper return section 131 to the protective sleeve 33, and the oil can flow to the second flow guide hole 332 above the protective sleeve 33, and then enters the second flow guide space 331, and under the agitation of the rotating movement of the second balance shaft 302, the oil splashes to the fifth bearing 315 on the second balance shaft 302 to provide lubrication for the fifth bearing 315, and the oil gas brought by the agitation provides lubricating oil for the inside of the fifth bearing 315 through the gap of the fifth bearing 315, and the excess oil in the first upper return section 131 flows back to the oil sump through the first lower return section 1321, and the oil of the fifth bearing 315 flows back to the oil sump through the second lower return section 1322, forming a complete lubrication cycle. Figure 1 Figure 12 ​​As shown, the engine 200 is arranged at a large angle, with the left side lower and the right side higher. Therefore, the oil return is arranged on the left side of the cylinder block 10, and the oil flows downward by gravity. The ventilation line 40 is arranged on the right side, and the oil and gas flow upward.

[0143] In addition, under the above arrangement, the second balance shaft cavity 1102 and the first balance shaft cavity 1101 are located on both sides of the crankshaft cavity 20, and the lowest position of the second balance shaft cavity 1102 is not higher than the lowest position of the first balance shaft cavity 1101, which is conducive to the reflux of oil.

[0144] like Figure 12 As shown, in some embodiments, the cylinder block assembly 100 further includes a main oil gallery 50 and an oil supply branch gallery 51. The oil supply branch gallery 51 is connected to the main oil gallery 50, and the oil supply branch gallery 51 is connected to the first balance shaft cavity 1101 and the second balance shaft cavity 1102. The main oil gallery 50 is connected to an oil pump, and the oil pump extracts and pressurizes lubricating oil from the oil pan and delivers it to various components of the engine through the main oil gallery 50. The two balance shaft cavities are connected to the main oil gallery 50 through the oil supply branch gallery 51. The high-pressure oil in the main oil gallery 50 can be used to lubricate the balance shaft bearings therein, thereby improving the lubrication effect and ensuring operational reliability.

[0145] like Figure 12 As shown, in some embodiments, the oil supply branch 51 includes a first oil passage 511, and the first balance shaft cavity 1101 includes a first balance shaft bearing cavity 115. The first balance shaft bearing cavity 115 is connected in series to the first oil passage 511. The first balance shaft bearing cavity 115 is used to install a first balance shaft bearing 31a provided on the first balance shaft 301, such as the first bearing 311. The first bearing 311 is located at one end of the first balance shaft 301, which can be used to install a sprocket. Therefore, the load on the first bearing 311 is relatively large. By connecting the first balance shaft bearing cavity 115 in series to the first oil passage 511, the high-pressure oil passage of the main oil passage 50 can be used to lubricate the first bearing 311, thereby improving the lubrication effect of the first bearing 311 and ensuring the reliability of the operation of the first bearing 311. In addition, the lubricating oil after lubricating the first bearing 311 can be further flowed to other locations to achieve full utilization of the oil. Of course, the first oil passage 511 can also be directly connected to the oil pan to facilitate the reuse of the oil.

[0146] In some examples, a crankshaft bearing cavity is provided in the crankshaft cavity 20, for installing a crankshaft bearing, and the crankshaft bearing is used to support the crankshaft. The first oil passage 511 is connected to the first balance shaft bearing cavity 115 through the crankshaft bearing cavity. That is to say, the oil in the main oil channel 50 can first enter the crankshaft bearing cavity, and the oil can flow into the crankshaft bearing in the crankshaft cavity 20, and then pass through the first oil passage 511 into the first bearing 311 of the first balance shaft cavity 1101.

[0147] In some examples, the crankshaft bearing cavity includes a transition oil passage 514, which is located on the outer periphery of the crankshaft bearing. The first oil passage 511 is connected to the first balance shaft bearing cavity 115 through the transition oil passage 514. By setting the transition oil passage 514, part of the oil can be passed into the crankshaft bearing in the crankshaft cavity 20, and part of the oil can flow along the transition oil passage 514 to the first oil passage 511. Compared with the oil that is lubricated by the crankshaft bearing and then passed into the first oil passage 511, it can not only improve the oil supply efficiency, but also improve the quality of the oil and improve the lubrication effect on the balance shaft bearing 31.

[0148] The transition oil passage 514 extends along the circumference of the crankshaft and can be formed by opening a groove in the circumference of the fixed hole of the crankshaft bearing. The structure is simple and easy to manufacture, while reducing flow resistance and improving flow efficiency. Figure 12 As shown, in some embodiments, the oil supply branch 51 also includes a crankshaft oil circuit 513, one end of the crankshaft oil circuit 513 is connected to the main oil channel 50, and the other end of the crankshaft oil circuit 513 extends to the oil supply port of the crankshaft chamber 20, for supplying oil to the crankshaft in the crankshaft chamber 20, and the first oil circuit 511 is connected to the crankshaft oil circuit 513, that is, the oil in the main oil channel 50 can first enter the crankshaft oil circuit 513, and then pass through the first oil circuit 511 into the first balance shaft bearing 31a of the first balance shaft chamber 1101, thereby utilizing the lubricating oil circuit of the crankshaft chamber 20 to lubricate the first balance shaft bearing 31a in the first balance shaft chamber 1101, and by sharing part of the oil circuit, the structural changes are reduced, and at the same time the oil supply path can be shortened, the pressure loss can be reduced, and the lubrication effect on the first balance shaft bearing 31a can be improved.

[0149] like Figure 12 As shown, in some embodiments, the oil supply branch 51 further includes a transition oil passage 514 , which extends along the circumference of the crankshaft. Both ends of the transition oil passage 514 are respectively connected to the crankshaft oil passage 513 and the first oil passage 511 .

[0150] like Figure 12As shown, in some embodiments, the oil supply branch 51 includes a second oil passage 512, the second balance shaft cavity 1102 includes a second balance shaft bearing cavity 116 connected in series with the second oil passage 512, and the second balance shaft bearing cavity 116 is used to mount a second balance shaft bearing 31b, such as a fourth bearing 314, provided on the second balance shaft 302, which is located at one end of the second balance shaft 302 and can be used to mount a sprocket, so that the load at the fourth bearing 314 is large. By connecting the second balance shaft bearing cavity 116 in series with the second oil passage 512, the fourth bearing 314 can be lubricated by the high-pressure oil passage of the main oil passage 50, improving the lubrication effect of the fourth bearing 314 and ensuring the reliability of the operation of the fourth bearing 314. The lubricating oil after lubricating the fourth bearing 314 can further flow to other positions to achieve full utilization of the oil. Of course, the second oil passage 512 can also be directly connected to the oil pan to facilitate the reuse of the oil.

[0151] The first bearing 311 is arranged at the first end of the first balance shaft 301 in the axial direction, and the first end of the first balance shaft 301 is adapted to be drivingly connected to the crankshaft, i.e., the end is the end of the first balance shaft 301 connected to an external power source. The fourth bearing 314 is arranged at the first end of the second balance shaft 302 in the axial direction, and the first end of the second balance shaft 302 is adapted to be drivingly connected to the crankshaft, i.e., the end is the end of the second balance shaft 302 connected to an external power source. Since the end bears a large load, the lubrication by the main oil supply is improved, thereby improving the lubrication effect. Figure 18 As shown, in some embodiments, the main oil passage 50 extends along the axial direction of the first balance shaft cavity 1101, and the main oil passage 50 is arranged adjacent to the first balance shaft cavity 1101. The end of the second oil passage 512 is connected to the main oil passage 50, so that the oil supply path to the first balance shaft cavity 1101 can be shortened, the pressure loss can be reduced, and the lubrication effect of the bearings 31 can be improved.

[0152] As shown, in some embodiments, the main oil passage 50 extends along the axial direction of the first balance shaft cavity 1101, and the main oil passage 50 is arranged adjacent to the first balance shaft cavity 1101. The end of the second oil passage 512 is connected to the main oil passage 50, so that the oil supply path to the first balance shaft cavity 1101 can be shortened, the pressure loss can be reduced, and the lubrication effect of the bearings 31 can be improved. Figure 18 As shown, the engine 200 according to the embodiment of the present application includes the cylinder block assembly 100 according to the embodiment of the present application. By using the above-mentioned cylinder block assembly 100, the balance shaft bearings can be effectively lubricated, thereby reducing the operating noise of the engine 200 and improving the operating efficiency of the engine 200. The overall structure of the engine 200 is changed little, the structure is simple, and the manufacturing of each structure is facilitated.

[0153] In some embodiments, the engine 200 further includes an oil pan, and an oil pan cover is arranged on one side of the crankshaft cavity 20. The oil pan has a storage space, and the storage space is connected to the crankshaft cavity 20.

[0154] As shown, in some embodiments, the main oil passage 50 extends along the axial direction of the first balance shaft cavity 1101, and the main oil passage 50 is arranged adjacent to the first balance shaft cavity 1101. The end of the second oil passage 512 is connected to the main oil passage 50, so that the oil supply path to the first balance shaft cavity 1101 can be shortened, the pressure loss can be reduced, and the lubrication effect of the bearings 31 can be improved. Figure 18As shown, the hybrid assembly 300 according to an embodiment of the present invention includes the engine 200 according to an embodiment of the present invention. By adopting the above-mentioned engine 200, the balance shaft bearing can be effectively lubricated, thereby reducing working noise and improving working efficiency.

[0155] In some examples, the hybrid assembly 300 includes a power generation assembly, which includes an engine 200 and a generator. The engine provides mechanical energy, and the generator converts the mechanical energy of the engine 200 into electrical energy. Of course, the power generation assembly can also include a speed increaser, which increases the lower output speed of the engine to the higher rated speed required by the generator.

[0156] In some examples, the hybrid assembly 300 includes a drive assembly, which includes an engine 200, a drive motor and a reducer. The engine 200 and the drive motor can both serve as power sources, and the reducer serves as a transmission structure. The reducer is connected to the wheel drive shaft, and the engine 200 and the drive motor can both be connected to the reducer to drive the wheels to rotate.

[0157] like ​ As shown, a vehicle 400 according to an embodiment of the present invention includes an engine 200 according to an embodiment of the present invention and / or a hybrid system 300 according to an embodiment of the present invention. By adopting the above-mentioned engine 200, the performance and comfort of the vehicle 400 can be improved, the maintenance cost can be reduced, and the reliability of the vehicle 400 can be improved.

[0158] Other components and operations of the vehicle 400 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail herein.

[0159] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature therebetween. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0160] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cylinder block assembly, characterized in that: Features: A first balancing shaft cavity (1101), wherein the first balancing shaft cavity (1101) is suitable for installing a first balancing shaft (301); a crankshaft chamber (20), wherein the crankshaft chamber (20) is suitable for mounting a crankshaft; a ventilation line (40), the ventilation line (40) being in communication with the crank chamber (20) and being used for discharging oil and gas in the crank chamber (20); Wherein, the first balancing shaft cavity (1101) is constructed as a part of the ventilation pipeline (40).

2. The cylinder block assembly according to claim 1, characterized in that: The cylinder block assembly has a communication port (21), and the crankshaft chamber (20) and the first balance shaft chamber (1101) are communicated through the communication port (21).

3. The cylinder block assembly according to claim 1, characterized in that: The invention also includes: a plurality of pistons (60), wherein the plurality of pistons (60) are connected to the crankshaft in the crankshaft chamber (20) through a connecting rod, wherein the crankshaft chamber (20) is provided with a plurality of chambers (201) corresponding to the plurality of pistons one by one, and each of the chambers (201) is respectively connected to the first balance shaft chamber (1101), and the movement directions of at least two adjacent pistons (60) are opposite, so that a pressure difference is formed between the chambers (201) corresponding to the two adjacent pistons with opposite movement directions, and the chambers (201) corresponding to the two adjacent pistons with opposite movement directions are connected.

4. The cylinder block assembly according to claim 3, characterized in that: The first balancing shaft (301) comprises a plurality of first balancing shaft bearings (31a), wherein the first balancing shaft (301) is supported in the first balancing shaft cavity (1101) by the plurality of first balancing shaft bearings (31a). The chambers (201) corresponding to two adjacent pistons with opposite movement directions are connected via a communication channel, and the gap between the inner ring and the outer ring of the first balancing shaft bearing (31a) forms a part of the communication channel.

5. The cylinder block assembly according to claim 2, characterized in that: comprising a plurality of first balancing shaft bearings (31a), The first balancing shaft (301) is supported in the first balancing shaft cavity (1101) by a plurality of the first balancing shaft bearings (31a); in the axial direction of the first balancing shaft (301), at least one of the communication ports (21) is located between two adjacent first balancing shaft bearings (31a).

6. The cylinder block assembly according to claim 2, characterized in that: It comprises a plurality of first balancing shaft bearings (31a), wherein the plurality of first balancing shaft bearings (31a) are sleeved on the first balancing shaft (301); The invention also includes: a first protective sleeve (32), the first protective sleeve (32) is sleeved on the first balancing shaft (301), and in the axial direction of the first balancing shaft (301), the first protective sleeve (32) is located between the two first balancing shaft bearings (31a), and a first guide space (321) is formed between the first protective sleeve (32) and the first balancing shaft (301), a first guide hole (322) is provided on the first protective sleeve (32), and a first drainage cavity (323) is formed between the protective sleeve (33) and the inner wall of the balancing shaft cavity (302), the first drainage cavity (323) is communicated with the communicating port (21), and the first drainage cavity (323) is communicated with the first guide space (321) through the first guide hole (322).

7. The cylinder block assembly according to claim 6, characterized in that: The first flow guide holes (322) include a plurality of holes, and at least some of the first flow guide holes (322) are arranged at intervals along the circumference of the first protective sleeve (32).

8. The cylinder block assembly according to claim 1, characterized in that: The cylinder block assembly further comprises: a second balancing shaft (302); the cylinder block assembly further comprises a second balancing shaft cavity (1102) and an oil return passage (13); the second balancing shaft (302) is disposed in the second balancing shaft cavity (1102); At least a portion of the oil return channel (13) is in communication with the second balancing shaft cavity (1102) so that the oil in the oil return channel (13) lubricates the second balancing shaft bearing (31b) on the second balancing shaft (302).

9. The cylinder block assembly according to claim 8, characterized in that: The oil return passage (13) comprises at least one upper oil return section (131) and at least one lower oil return section (132); the upper oil return section (131) is located above the second balance shaft cavity (1102); the lower oil return section (132) is located below the second balance shaft cavity (1102); the upper oil return section (131) and the lower oil return section (132) are respectively connected to the second balance shaft cavity (1102); and the lower oil return section (132) is suitable for connecting to the oil storage space in the oil pan.

10. The cylinder block assembly according to claim 9, characterized in that: comprising a plurality of second balancing shaft bearings (31b), The second balancing shaft (302) is supported in the second balancing shaft cavity (1102) by a plurality of second balancing shaft bearings (31b); in the axial direction of the second balancing shaft (302), at least one upper oil return section (131) is located between two of the second balancing shaft bearings (31b).

11. The cylinder block assembly according to claim 10, characterized in that: The invention also includes: a second protective sleeve (33), the second protective sleeve (33) is sleeved on the second balancing shaft (302) and in the axial direction of the second balancing shaft (302), the second protective sleeve (33) is located between the two second balancing shaft bearings (31b), a second guide space (331) is formed between the second protective sleeve (33) and the second balancing shaft (302), a second guide hole (332) is provided on the second protective sleeve (33), a second drainage cavity (333) is formed between the second protective sleeve (33) and the inner wall of the second balancing shaft cavity (302), the second drainage cavity (333) is respectively connected to the upper oil return section (131) and the lower oil return section, and the second drainage cavity (333) is connected to the second guide space (331) through the second guide hole (332).

12. The cylinder block assembly according to claim 11, characterized in that: The cylinder block assembly has a connecting hole, the upper oil return section (131) and the drainage chamber (333) are connected through the connecting hole, and in the axial direction of the second balance shaft (302), the connecting hole and the second guide hole (332) are staggered.

13. The cylinder block assembly according to claim 9, characterized in that: The second balancing shaft bearing (31b) includes a fourth bearing (314), a fifth bearing (315) and a sixth bearing (316); the upper oil return section (131) includes a first upper oil return section (1311) and a second upper oil return section (1312); the first upper oil return section (1311) and the second upper oil return section (1312) are arranged at intervals along the axial direction of the second balancing shaft (302); In the axial direction of the second balance shaft (302), the first upper oil return section (1311) is located between the fourth bearing (314) and the fifth bearing (315), and the second upper oil return section (1312) is located between the fifth bearing (315) and the sixth bearing (316).

14. The cylinder block assembly according to claim 8, characterized in that: The oil return channel (13) further comprises a direct current section (133), the direct current section (133) being spaced apart from the second balance shaft cavity (1102), and the direct current section (133) being adapted to communicate with the oil storage space of the oil pan.

15. The cylinder block assembly according to claim 8, characterized in that: The cylinder block assembly has a first side and a second side that are arranged opposite to each other, the ventilation line (40) is located on the first side of the cylinder block assembly, and the oil return passage is located on the second side of the cylinder block assembly.

16. The cylinder block assembly according to claim 15, characterized in that: When the engine is placed on a vehicle, the first side of the cylinder block assembly is higher than the second side.

17. The cylinder block assembly according to any one of claims 8 to 16, characterized in that: The oil supply branch channel (51) is connected to the main oil channel (50), and the oil supply branch channel (51) is connected to the first balance shaft cavity (1101) and the second balance shaft cavity (1102).

18. The cylinder block assembly according to claim 17, characterized in that: The first balancing shaft cavity (1101) includes a first balancing shaft bearing cavity (115), and the first balancing shaft bearing cavity (115) is used to install a first bearing (311) provided on the first balancing shaft (301). The oil supply branch channel (51) includes a first oil passage (511), and the first balancing shaft bearing cavity (115) is connected to the main oil passage (50) through the first oil passage (511).

19. The cylinder block assembly according to claim 18, characterized in that: A crankshaft bearing cavity is provided in the crankshaft cavity (20), and the crankshaft bearing supporting the crankshaft is installed in the crankshaft bearing cavity. The first oil passage (511) is communicated with the first balance shaft bearing cavity (115) through the crankshaft bearing cavity.

20. The cylinder block assembly according to claim 19, wherein: The crankshaft bearing cavity comprises a transition oil passage (514) located on the outer periphery of the crankshaft bearing, and the first oil passage is communicated with the first balance shaft bearing cavity through the transition oil passage (514).

21. The cylinder block assembly according to claim 18, wherein: The second balancing shaft cavity (1102) includes a second balancing shaft bearing cavity (116), and the second balancing shaft bearing cavity (116) is used to install a fourth bearing (314) provided on the second balancing shaft (302). The oil supply branch passage (51) includes a second oil passage (512), and the second balancing shaft bearing cavity (116) is connected to the main oil passage (50) through the second oil passage (512).

22. The cylinder block assembly according to claim 21, characterized in that: The main oil passage (50) extends along the axial direction of the second balance shaft cavity (1102) and is arranged adjacent to the second balance shaft cavity (1102).

23. The cylinder block assembly according to claim 21, characterized in that The first bearing (311) is provided at a first axial end of the first balance shaft (301), and the first end of the first balance shaft (301) is suitable for being connected to a crankshaft in driving relation; and / or, The fourth bearing (314) is provided at the first axial end of the second balance shaft (302), and the first end of the second balance shaft (302) is suitable for being connected to the crankshaft in a driving manner.

24. An engine, characterized in that: Comprising a cylinder block assembly according to any one of claims 1-23.

25. The engine of claim 24, further comprising: An oil pan, wherein the oil pan cover is arranged on one side of the crank chamber, and the oil pan has an oil storage space communicated with the crank chamber.

26. A hybrid assembly, characterized in that: Comprising an engine according to any one of claims 24-25.

27. A vehicle, characterized in that: Comprising the engine according to any one of claims 24-25 and / or the hybrid assembly according to claim 26.

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