Powertrain

Abstract

Powertrain, comprising: an internal combustion engine (10) comprising a crankshaft (12) and an internal combustion engine block (14); a rotor section (40) which is connected to the crankshaft (12) and of which a magnet (42) is connected to a first side of the rotor section (40); a stator section (50) which is arranged between the rotor section (40) and the internal combustion engine block (14); a cylinder block water jacket (80) formed on the internal combustion engine (10) and in which an electric motor cooling opening (82) is formed for cooling an electric motor; and an electric motor housing (30) which is connected to the combustion engine block (14) and in which a housing opening (32) is formed, wherein an inlet (34) and an outlet (36), through which coolant from the electric motor cooling opening (82) can flow, are formed in the electric motor housing (30) for cooling the stator section (50), wherein the stator section (50) has: a core plate (54) on which a coil (52) is wound along a radial direction of the core plate (54); and a stator plate (56) in which a coil slot (57) is formed, into which the coil (52) is inserted, and wherein a cooling chamber (58) is formed within the stator plate (56) along a radial direction thereof, and the cooling chamber (58) is connected to the inlet (34) and the outlet (36).

Description

[0001] The invention relates to a drive train, and in particular a drive train equipped with a two-cylinder internal combustion engine and an electric motor.

[0002] Recently, research has been conducted to increase the fuel efficiency of a vehicle, such as by developing a two-cylinder engine or a three-cylinder engine.

[0003] However, the increase in power and fuel efficiency of the two-cylinder or three-cylinder engine may be limited depending on different vehicle propulsion conditions.

[0004] Similarly, the two-cylinder or three-cylinder engine emits relatively serious vibrations, and the use of an element such as a balance shaft to suppress vibrations on the two-cylinder or three-cylinder engine can be limiting.

[0005] DE 100 43 736 A1 and DE 100 43 856 A1 each describe a drive train comprising an internal combustion engine having a crankshaft and an internal combustion engine block, a rotor section connected to the crankshaft and from which a magnet is connected to a first side of the rotor section, a stator section arranged between the rotor section and the internal combustion engine block, a cylinder block water jacket formed on the internal combustion engine and in which an electric motor cooling opening is formed for cooling an electric motor.

[0006] The CN 2 03 537 176 U describes a water cooling system for an electric motor.

[0007] The invention creates a drive train equipped with a two-cylinder combustion engine and an electric motor, in which vibrations and noise are reduced and fuel efficiency is increased.

[0008] This is achieved according to the invention by a drive train according to the features of claim 1 or 13. Advantageous further developments are described in the dependent claims.

[0009] A drive train according to an exemplary embodiment of the invention comprises: an internal combustion engine having a crankshaft and an internal combustion engine block, a rotor section connected to the crankshaft and to which a magnet is connected with a first side thereof, a stator section arranged between the rotor section and the internal combustion engine block, and a cylinder block water jacket formed on the internal combustion engine and in which an electric motor cooling opening is formed for cooling an electric motor.

[0010] The drive train further comprises an electric motor housing which is connected to the combustion engine block and in which a housing opening is formed, wherein an inlet and an outlet, through which coolant from the electric motor cooling opening can flow, are formed in the electric motor housing for cooling the stator section.

[0011] The stator section has a core plate on which a coil is wound along a radial direction, and a stator plate in which a coil slot is formed into which the coil is inserted.

[0012] A receiving section for the stator section can be formed in the electric motor housing.

[0013] The inlet can direct the coolant to the stator plate, and the outlet can release the coolant from the stator plate.

[0014] A cooling chamber is formed inside the stator plate along a radial direction thereof, and the cooling chamber is connected to the inlet and the outlet.

[0015] The drive train may also include a gearbox and a clutch, which optionally transmits a rotation of the rotor section to the gearbox.

[0016] The rotor section may have a projecting section that is connected to the crankshaft via the housing opening, and a disk that is connected to the projecting section and to which the magnet is connected.

[0017] A radiation section can be formed on the rotor section.

[0018] The radiation section can be formed on an outer circumference of the disk.

[0019] The radiation section can have a concave shape on the outer circumference of the disk.

[0020] A compensating section can be formed on the disc to compensate for unbalanced rotational energy transmitted by the crankshaft.

[0021] The compensating section can have a fan shape along one circumferential direction of the disk.

[0022] The compensating section can be made of a material whose density is lower than that of the disk.

[0023] The internal combustion engine can be a two-cylinder internal combustion engine, and the balance section can be designed in a position that corresponds to a crankpin of the crankshaft.

[0024] A drive train according to another exemplary embodiment of the invention comprises: an internal combustion engine having a crankshaft and an internal combustion engine block, an electric motor housing connected to the internal combustion engine block and in which a housing opening is formed, a rotor section connected to the crankshaft via the housing opening, of which a magnet is connected to a first side and which stores unbalanced rotational energy transmitted by the crankshaft, a stator section arranged between the rotor section and the electric motor housing and connected to the electric motor housing, wherein the stator section has a core plate on which a coil is wound along a radial direction thereof, and a stator plate in which a coil groove is formed into which the coil is inserted, and a transmission connected to the internal combustion engine block.a cooling chamber is formed in the stator plate.

[0025] An inlet and an outlet, connected to the cooling chamber in such a way that coolant can flow through them, can be formed in the electric motor housing.

[0026] The cooling chamber is formed within the stator plate along a radial direction of it.

[0027] The drive train may also include a cylinder block water jacket formed on the internal combustion engine, to which an electric motor cooling opening is connected with the inlet.

[0028] As described above, the powertrain, which includes a two-cylinder internal combustion engine and an electric motor, can reduce vibrations and noise and increase fuel efficiency according to an exemplary embodiment of the invention, and the size of the internal combustion engine can also be reduced.

[0029] Since an electric motor cooling opening is designed in a cylinder block water jacket for cooling an electric motor, no additional cooling lines are required.

[0030] The invention is explained in more detail with reference to the drawing. The drawing shows: Fig. 1 a front view of a drive train according to an exemplary embodiment of the invention; Fig. 2 an exploded view of a drive train according to an exemplary embodiment of the invention; Fig. 3 a perspective view of a cylinder block water jacket of a drive train according to an exemplary embodiment of the invention; Fig. 4 a perspective exploded view of a stator section of a drive train according to an exemplary embodiment of the invention; Fig. 5 a perspective partial view of a stator section of a drive train according to an exemplary embodiment of the invention; Fig. 6 a perspective view of a stator plate of a drive train according to an exemplary embodiment of the invention; Fig. 7 a sectional view of a stator plate of a drive train according to an exemplary embodiment of the invention; Fig. 8 a sectional view of an internal combustion engine of a drive train according to an exemplary embodiment of the invention; Fig. 9 a perspective view of a rotor section of a drive train according to an exemplary embodiment of the invention; Fig. 10 a perspective exploded view of a drive train according to an exemplary embodiment of the invention; Fig. 11 a front view of a rotor section of a drive train according to an exemplary embodiment of the invention; and Fig. 12 a diagram of a drive train according to an exemplary embodiment of the invention.

[0031] In the following detailed description, only certain exemplary embodiments of the invention are shown and described for illustrative purposes.

[0032] As technically skilled professionals would recognize, the described embodiments could be modified in various ways without deviating from the essence or scope of the invention.

[0033] A part that is irrelevant to the description is omitted in order to clearly describe the invention, and the same or similar elements are designated by the same reference drawings throughout the description.

[0034] In the drawing, the thickness of layers, films, panels, areas, etc., is exaggerated for clarity.

[0035] In the description and claims, unless expressly stated otherwise, the term "have" and its variations, such as "has" or "having ... the elements mentioned, are to be understood as including the elements mentioned but not excluding other elements.

[0036] An exemplary embodiment of the invention is described in detail below with reference to the drawing.

[0037] With regard to the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 comprises a drive train 1 according to an exemplary embodiment of the invention, an internal combustion engine 10, which has a crankshaft 12 and an internal combustion engine block 14, a rotor section 40, which is connected to the crankshaft 12 and to whose first side a magnet 42 is connected, a stator section 50, which is arranged between the rotor section 40 and the internal combustion engine block 14, and a cylinder block water jacket 80, which is formed on the internal combustion engine 10 and in which an electric motor cooling opening 82 is formed for cooling an electric motor.

[0038] An electric motor housing 30, in which a housing opening 32 is formed, is connected to the combustion engine block 14.

[0039] The rotor section 40 has a projecting section 45 which is connected to the crankshaft 12 via the housing opening 32, and a disk 41 which is connected to the projecting section 45 and to which the magnet 42 is connected.

[0040] In an exemplary embodiment of the invention, the drive train 1 further comprises a gearbox 60 and a clutch 70, which selectively transmits a rotation of the rotor section 40 to the gearbox 60.

[0041] In an exemplary embodiment of the invention, the drive train 1 has an electric motor / rotor section 20 which is arranged between the internal combustion engine 10 and the transmission 60 and acts as a flywheel and an electric motor, and therefore the electric motor / rotor section 20 can reduce the vibrations of the internal combustion engine 10 and support the output power of the internal combustion engine 10.

[0042] In this case, the electric motor / rotor section 20 has the rotor section 40 and the stator section 50.

[0043] The rotor section 40 is directly connected to the crankshaft 12 and stores rotational energy of the crankshaft 12, which acts as a flywheel in such a way that the rotor section 40 can reduce the vibrations of the internal combustion engine 10.

[0044] The stator section 50 and the rotor section 40 can act as an electric motor to assist the power output of the internal combustion engine 10 and can serve as a primary drive source when the internal combustion engine 10 is not operating. Furthermore, the stator section 50 and the rotor section 40 deliver a compensating torque corresponding to the vibrations of the internal combustion engine 10, so that the stator section 50 and the rotor section 40 can act as a counterweight.

[0045] The stator section 50 has a core plate 54, along whose radial direction a coil 52 is wound, and a stator plate 56 in which a coil slot 57 is formed, into which the coil 52 is inserted. The stator plate 56 is connected to the electric motor housing 30.

[0046] A receiving section 31 for the support of the stator section 50 can be formed in the electric motor housing 30, and therefore an increase in the length of the electric motor / rotor section 20 can be prevented.

[0047] The electric motor housing 30 and the stator plate 56 can be assembled using a screw, so that assembly and disassembly can be carried out easily.

[0048] Since the stator section 50 is arranged between the rotor section 40 and the electric motor housing 30, assembly can be carried out easily, and therefore the electric motor / rotor section 20 can be stable.

[0049] Since the coil 52 is inserted into the coil groove 57, the coil 52 can be stably fixed in a predetermined position without additional parts.

[0050] This means that the magnet 42 and the coil 52 are arranged along a radial direction, and therefore an increase in the length of the electric motor / rotor section 20 can be suppressed.

[0051] An inlet 34 and an outlet 36 for the flow of coolant from the electric motor cooling opening 82 are provided in the electric motor housing 30 for cooling the stator section 50.

[0052] A connecting pipe 33, which is connected to the electric motor cooling opening 82, can be inserted into the inlet 34.

[0053] The inlet 34 supplies the coolant to the stator plate 56, and the outlet 36 releases the coolant from the stator plate 56.

[0054] With regard to the Fig. 6 and Fig. 7 a cooling chamber 58 is formed within the stator plate 56 along a radial direction thereof, and the cooling chamber 58 is connected to the outlet 36 and is connected to the inlet 34 via a cooling chamber inlet 59 formed in the stator plate 56.

[0055] With regard to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. Section 8 describes the cooling of the electric motor.

[0056] A coolant is supplied by a water pump to the cylinder block water jacket 80, and part of the coolant is supplied via the electric motor cooling opening 82, the connecting pipe 33 and the cooling chamber inlet 59 to the cooling chamber 58.

[0057] The coolant, which is directed to the cooling chamber 58, cools the stator plate 56 and the coil 52, which is connected to the stator plate 56.

[0058] The coolant inside the cooling chamber 58 is discharged via the outlet 36.

[0059] With regard to the Fig. 9, Fig. 10 to Fig. 11 is a radiation section 46 formed in the rotor section 40.

[0060] The radiation section 46 is formed on an outer circumference of the rotor section 40.

[0061] The radiation section 46 has a concave shape in the outer circumference of the rotor section 40.

[0062] That is, as in Fig. As shown in Figure 9, since the radiation section 46 is formed as a concave shape on the outer circumference of the rotor section 40, the manufacturing process of the rotor section 40 is simplified. The rotor section 40 can circulate the air surrounding it to cool it. The surface area of ​​the rotor section 40 is increased as a result of the radiation section 46, and therefore the heat transfer of the rotor section 40 is enhanced.

[0063] A compensating section 90 is formed on the rotor section 40 to compensate for unbalanced rotational energy transmitted by the crankshaft 12.

[0064] The rotor section 40 is designed as a disk shape, and the compensating section 90 is designed as a concave shape on a first side of the rotor section 40.

[0065] This means that the balancing section 90 can be a spatial function, i.e., a balancing weight with a negative value. Therefore, the total weight of the rotor section 40 can be reduced, allowing the rotor section 40 to be highly efficient at high speeds.

[0066] The compensating section 90 is designed as a fan shape along a circumferential direction of the rotor section 40.

[0067] Therefore, the cross-section along a diameter direction of the rotor section 40 can be simplified and highly efficient in productivity.

[0068] In a modified exemplary embodiment of the invention, the compensating section 90 can be made of a material whose density is lower than that of the disk 41 of the rotor section 40. Therefore, the stiffness of the rotor section 40 can be maintained.

[0069] The compensating section 90 is designed in a position that corresponds to a crankpin 16 of the crankshaft 12.

[0070] A connecting rod 81 is connected to the crankpin 16 and also to a piston 83. The compensating section 90 is positioned in the position corresponding to the crankpin 16 of the crankshaft 12 to compensate for the unbalanced rotational energy transmitted by the crankshaft 12.

[0071] A form of the 90° regression section, denoted by “α” in Fig. As shown in Figure 11, the imbalance force resulting from the reciprocating motion of the piston 83 can be determined.

[0072] With reference to Fig. In the exemplary embodiment of the invention, the combustion engine 10 is directly connected to the electric motor / rotor section 20, and the coupling 70 is arranged between the gearbox 60 and the rotor section 40 for selectively connecting the gearbox 60 to the rotor section 40.

[0073] Depending on the connection state of the coupling 70, the electric motor / rotor section 20 can act as a starter motor by means of supplied electric current from a battery 72, and can also act as a drive power source that supports the internal combustion engine 10.

[0074] The electric motor / rotor section 20 can act as a generator when auxiliary power is not required, and the generated electric current is stored in the battery 72.

[0075] As described above, the powertrain, which includes a two-cylinder internal combustion engine and an electric motor, can reduce vibrations and noise and increase fuel efficiency according to an exemplary embodiment of the invention, and the size of the internal combustion engine can also be reduced.

[0076] Since an electric motor cooling opening is designed in a cylinder block water jacket for cooling an electric motor, no additional cooling lines are required.

Claims

[1] Powertrain comprising: an internal combustion engine (10) comprising a crankshaft (12) and an internal combustion engine block (14); a rotor section (40) which is connected to the crankshaft (12) and of which a magnet (42) is connected to a first side of the rotor section (40); a stator section (50) which is arranged between the rotor section (40) and the internal combustion engine block (14); a cylinder block water jacket (80) formed on the internal combustion engine (10) and in which an electric motor cooling opening (82) is formed for cooling an electric motor; and an electric motor housing (30) which is connected to the combustion engine block (14) and in which a housing opening (32) is formed, wherein an inlet (34) and an outlet (36), through which coolant from the electric motor cooling opening (82) can flow, are formed in the electric motor housing (30) for cooling the stator section (50), wherein the stator section (50) has: a core plate (54) on which a coil (52) is wound along a radial direction of the core plate (54); and a stator plate (56) in which a coil slot (57) is formed, into which the coil (52) is inserted, and wherein a cooling chamber (58) is formed within the stator plate (56) along a radial direction thereof, and the cooling chamber (58) is connected to the inlet (34) and the outlet (36). [2] Drive train according to claim 1, wherein a receiving section (31) is formed for resting the stator section (50) in the electric motor housing (30). [3] Powertrain according to claim 1 or 2, wherein: the inlet (34) leads the coolant to the stator plate (56), and the outlet (36) releases the coolant from the stator plate (56). [4] Powertrain according to any one of claims 1 to 3, further comprising: a gearbox (60); and a coupling (70) which selectively transmits a rotation of the rotor section (40) to the gearbox (60). [5] Drive train according to any one of claims 1 to 3, wherein the rotor section (40) comprises: a projecting section (45) which is connected to the crankshaft (12) via the housing opening (32); and a disk (41) which is connected to the preceding section (45) and to which the magnet (42) is connected. [6] Drive train according to claim 5, wherein a radiation section (46) is formed on the rotor section (40). [7] Drive train according to claim 6, wherein the radiation section (46) is formed on an outer circumference of the disk (41). [8] Drive train according to claim 7, wherein the radiation section (46) has a concave shape in the outer circumference of the disk (41). [9] Drive train according to one of claims 5 to 8, wherein a compensating section (90) is formed on the disk (41) to compensate for unbalanced rotational energy transmitted by the crankshaft (12). [10] Drive train according to claim 9, wherein the compensating section (90) has a fan shape along a circumferential direction of the disk (41). [11] Drive train according to claim 9 or 10, wherein the compensating section (90) is made of a material whose density is less than that of the disk (41). [12] Powertrain according to any one of claims 9 to 11, wherein: the internal combustion engine (10) is a two-cylinder internal combustion engine, and the compensating section (90) is arranged in a position that corresponds to a crankpin (16) of the crankshaft (12). [13] Powertrain comprising: an internal combustion engine (10) comprising a crankshaft (12) and an internal combustion engine block (14); an electric motor housing (30) which is connected to the combustion engine block (14) and in which a housing opening (32) is formed; a rotor section (40) which is connected to the crankshaft (12) via the housing opening (32), of which a magnet (42) is connected to a first side thereof, and which stores unbalanced rotational energy which is transmitted by the crankshaft (12); a stator section (50) arranged between the rotor section (40) and the electric motor housing (30) and connected to the electric motor housing (30), the stator section (50) comprising a core plate (54) on which a coil (52) is wound along a radial direction thereof, and a stator plate (56) in which a coil slot (57) is formed into which the coil (52) is inserted; and a gearbox (60) connected to the internal combustion engine block (14), wherein a cooling chamber (58) is formed in the stator plate (56), and wherein the cooling chamber (58) is formed within the stator plate (56) along a radial direction thereof. [14] Drive train according to claim 13, wherein an inlet (34) and an outlet (36) which are connected to the cooling chamber (58) in such a way that they can be supplied with coolant, are formed in the electric motor housing (30). [15] Drive train according to claim 14, further comprising a cylinder block water jacket (80) formed on the internal combustion engine (10) and through which an electric motor cooling opening (82) is connected to the inlet (34).

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