Range extender

Abstract

The range extender comprises an engine and a generator which are connected, the engine comprises an air cylinder body, an engine oil pan and an oil seal assembly, the air cylinder body and the engine oil pan are distributed in the height direction, a first sealing piece is arranged between the air cylinder body and the engine oil pan, and a second sealing piece is arranged between the generator and the engine. The oil seal assembly is located between the engine and the generator, and a third sealing piece is arranged between the oil seal assembly and the engine. In the length direction and / or the width direction of the range extender, the second sealing piece and the third sealing piece are arranged in a spaced mode, at least part of the first sealing piece is connected with the second sealing piece and the third sealing piece at the same time to form a three-dimensional annular sealing structure, and engine oil in an engine oil pan can be prevented from leaking to the outside of an engine; in addition, engine oil in the crankcase can be prevented from leaking into the generator, dust and water in the external environment can be prevented from permeating into the engine and the generator, the sealing reliability of the range extender is improved, and the service life of the range extender is prolonged.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a range extender. Background Technology

[0002] Range extenders are typically installed in range-extended electric vehicles (REEVs) and are primarily used to convert the chemical energy of fuels (such as gasoline and natural gas) into electrical energy to power the vehicle's drive motor or charge the onboard battery, thereby extending the vehicle's driving range. A range extender consists of an interconnected cylinder block, an oil pan, and a generator. During assembly, these three components form multiple mating surfaces, each sealed with seals to ensure a tight connection between the cylinder block and the oil pan, the cylinder block and the generator, and the oil pan and the generator.

[0003] In the existing technology, the seals on each mating surface are independent of each other. When the range extender is affected by factors such as assembly error, vibration, wear or aging, the relative displacement between the components is likely to occur. During the displacement process, the seals on the mating surface will move, which will affect the sealing performance between the components. This can easily lead to internal oil leakage and the risk of external liquid penetrating into the interior, thereby affecting the working performance and service life of the range extender. Utility Model Content

[0004] In view of this, this application provides a range extender to solve the technical problems in the prior art where reduced sealing performance of the range extender leads to leakage of internal engine oil and penetration of external liquids into the interior.

[0005] This application provides a range extender, which includes a connected engine and a generator; the engine includes a cylinder block and an oil pan distributed along the height direction of the range extender, and a first seal is provided between the cylinder block and the oil pan; the generator is located on one side of the engine along the length direction of the range extender, and a second seal is provided between the generator and the engine; the engine further includes an oil seal assembly located on the side of the engine facing the generator, and a third seal is provided between the oil seal assembly and the cylinder block; wherein, along the length direction and / or width direction of the range extender, the second seal and the third seal are spaced apart, at least a portion of the first seal is connected to the second seal, and at least a portion of the first seal is connected to the third seal to form a three-dimensional annular sealing structure.

[0006] In this embodiment, by setting a seal that connects simultaneously with a second and a third seal to form a three-dimensional annular sealing structure, it is possible to prevent oil leakage from the oil pan to the outside of the engine, prevent oil leakage from the crankcase to the inside of the generator, and prevent dust and moisture from the external environment from penetrating into the engine and generator. This design allows multiple seals to be interconnected to form a continuous sealing path. When the range extender operates at high power or high temperature, and relative displacement occurs between components, causing synchronous movement of the seals at their mating surfaces, the seals can provide mutual tension, thereby reducing the amount of displacement between components, preventing leakage channels at the mating surfaces, improving the installation stability of each seal, enhancing the overall sealing reliability of the range extender, and extending its service life.

[0007] In one possible implementation, the engine further includes a crankcase, the oil pan further includes an oil reservoir, the generator further includes a stator and a rotor, and the first seal includes a first sealing section, a second sealing section, and a third sealing section; the first sealing section is disposed around the oil reservoir and is used to seal the oil reservoir; one end of the second sealing section is connected to the first sealing section, and the other end of the second sealing section is connected to the second seal to form a first annular sealing structure for sealing the oil reservoir, the stator, and the rotor; one end of the third sealing section is connected to the first sealing section, and the other end of the third sealing section is connected to the third seal to form a second annular sealing structure for sealing the oil reservoir and the crankcase.

[0008] In one possible implementation, along the length of the range extender, the area at the connection between the second sealing section and the second seal is greater than the area at the connection between the second sealing section and the first sealing section, and / or, the area at the connection between the third sealing section and the third seal is greater than the area at the connection between the third sealing section and the first sealing section.

[0009] In one possible implementation, at the connection between the second sealing segment and the second sealing member, the second sealing segment and / or the second sealing member are provided with a first reinforcing rib to divide the end of the second sealing segment and / or the second sealing member into a plurality of first sealing spaces; at the connection between the third sealing segment and the third sealing member, the third sealing segment and / or the third sealing member are provided with a second reinforcing rib to divide the end of the third sealing segment and / or the third sealing member into a plurality of second sealing spaces.

[0010] In one possible implementation, the first sealing section, the second sealing section, and the third sealing section are integrally formed.

[0011] In one possible implementation, at least one of the cylinder block and the oil pan is provided with a first receiving groove along the height direction of the range extender, the first receiving groove being used to receive the first seal.

[0012] In one possible implementation, the width of the first receiving groove is L1, and L1 satisfies 3mm≤L1≤5mm, and the depth of the first receiving groove is H1, and H1 satisfies 0.5mm≤H1≤1.5mm.

[0013] In one possible implementation, the inner edge of the cylinder block is provided with a first chamfer, and the inner edge of the oil pan is provided with a second chamfer. Along the height direction of the range extender, the first chamfer and the second chamfer form a second receiving groove, which is used to receive a fourth seal, and the fourth seal is used to seal the inner edge of the joint between the cylinder block and the oil pan.

[0014] In one possible implementation, the width of the second receiving groove is L2, and L2 satisfies 4mm≤L2≤6mm, the depth of the second receiving groove is H2, and H2 satisfies 0.5mm≤H2≤1.5mm, and the angle between the sidewall of the second receiving groove and the height direction of the range extender is α, and α satisfies 5°≤α≤15°.

[0015] In one possible implementation, at least one of the cylinder block and the oil pan is provided with a first receiving groove for accommodating the first seal. The distance between the side wall of the first receiving groove and the bottom wall of the second receiving groove along the length and width directions of the range extender is L3, and L3 satisfies 3mm≤L3≤5mm.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an exploded view of one embodiment of the range extender provided in this application;

[0019] Figure 2 This is a structural schematic diagram of the connection between the first seal and the second and third seals provided in this application;

[0020] Figure 3 This is a partial enlarged view of the oil pan provided in this application;

[0021] Figure 4 This is a partial sectional view of the cylinder block and oil pan provided in this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1- Engine;

[0024] 11-Cylinder block;

[0025] 111 - First chamfer;

[0026] 12-Oil pan;

[0027] 121 - Oil storage tank;

[0028] 122 - First receiving tank;

[0029] 123 - Second chamfer;

[0030] 13-Oil seal assembly;

[0031] 2-Generator;

[0032] 3-First seal;

[0033] 31 - First sealing section;

[0034] 32 - Second sealing section;

[0035] 33 - Third sealing section;

[0036] 4-Second seal;

[0037] 5-Third seal;

[0038] 51 - Second reinforcing rib;

[0039] 6-Second receiving tank.

[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0041] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0042] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0043] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0044] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0045] Embodiments of this application provide a range extender, such as Figure 1 and Figure 2 As shown, the range extender includes an engine 1 and a generator 2 connected together. The engine 1 includes a cylinder block 11 and an oil pan 12 distributed along the height direction of the range extender, and a first seal 3 is provided between the cylinder block 11 and the oil pan 12; the generator 2 is located on one side of the engine 1 along the length direction of the range extender, and a second seal 4 is provided between the generator 2 and the engine 1; the engine 1 also includes an oil seal assembly 13, which is located on the side of the engine 1 facing the generator 2, and a third seal 5 is provided between the oil seal assembly 13 and the cylinder block 11.

[0046] In this configuration, along the length and / or width of the range extender, the second seal 4 and the third seal 5 are spaced apart, at least a portion of the first seal 3 is connected to the second seal 4, and at least a portion of the first seal 3 is connected to the third seal 5, to form a three-dimensional annular sealing structure.

[0047] In this embodiment, by setting a sealing element 3 to be connected to the second sealing element 4 and the third sealing element 5 to form a three-dimensional annular sealing structure, it is possible to prevent the oil in the oil pan 12 from leaking to the outside of the engine 1, and also to prevent the oil in the crankcase from leaking to the inside of the generator 2. It is also possible to prevent dust and moisture from the external environment from penetrating into the engine 1 and the generator 2, thereby improving the stability and reliability of the range extender during operation and extending its service life.

[0048] Specifically, the cylinder block 11, as the core component of the range extender, is mainly used to burn fuel and generate power, while the oil pan 12, which is distributed along the height of the range extender with the cylinder block 11, is mainly used to store and circulate oil to ensure that the lubrication system of the range extender can work normally.

[0049] Therefore, by providing a first seal 3 between the cylinder block 11 and the oil pan 12, the sealing performance at the connection between the cylinder block 11 and the oil pan 12 can be improved, reducing the possibility of oil leakage to the outside of the engine 1 through the mating surface of the cylinder block 11 and the oil pan 12. This avoids the risk of oil circulation pressure imbalance and ensures the lubrication efficiency of the range extender lubrication system. The first seal 3 also reduces the possibility of dust or moisture from the external environment penetrating into the engine 1 through the mating surface of the cylinder block 11 and the oil pan 12, thus avoiding the risk of oil contamination, increasing the number of oil cycles, and extending the service life of the range extender.

[0050] Specifically, generator 2 is usually directly connected to the crankshaft in engine 1, and is mainly used to convert the power generated by engine 1 into electrical energy and transmit it to electric motor or vehicle battery in order to extend the vehicle's driving range.

[0051] Therefore, by setting a second seal 4 between the engine 1 and the generator 2, the sealing performance at the connection between the engine 1 and the generator 2 can be improved, reducing the possibility of dust or moisture from the external environment entering the generator 2 through the joint surface of the engine 1 and the generator 2. This can avoid the risk of short circuits or failures of the internal components of the generator 2 due to contamination or wear, thereby improving the stability and reliability of the generator 2 during operation and ensuring the working performance of the range extender.

[0052] Specifically, the oil seal assembly 13 is usually directly connected to the crankcase in the engine 1, and is mainly used to seal the gap between the crankshaft and the crankcase to ensure that the lubrication system of the range extender can work properly.

[0053] It should be noted that the crankcase is usually integrally formed with the cylinder block 11, and the crankcase is located on the side of the cylinder block 11 facing the oil pan 12.

[0054] Therefore, by providing a third seal 5 between the oil seal assembly 13 and the cylinder block 11, the sealing performance at the connection between the oil seal assembly 13 and the crankcase can be improved, reducing the possibility of oil leaking into the generator 2 through the mating surface of the oil seal assembly 13 and the crankcase. This avoids the risk of imbalance in the oil circulation pressure and the risk of oil contaminating the internal components of the generator 2, causing short circuits or failures. Consequently, it ensures the lubrication efficiency of the lubrication system and the stability and reliability of the generator 2 during operation.

[0055] Therefore, in this embodiment of the application, by setting a sealing element 3 to be connected to the second sealing element 4 and the third sealing element 5 to form a three-dimensional annular sealing structure, multiple sealing elements can be connected to each other to form a continuous sealing path. When the range extender is in a high-power or high-temperature environment, when the relative displacement between the components causes the sealing elements at their mating surfaces to move synchronously, the sealing elements can provide mutual tension, thereby reducing the amount of displacement between the components, avoiding leakage channels at the mating surfaces between the components, and thus improving the installation stability of each sealing element and improving the overall sealing reliability of the range extender.

[0056] This design also reduces the number of individual seals, thus simplifying the assembly process of the range extender. Furthermore, it expands the range extender's applicability, making it more stable and reliable in high-power or high-temperature environments, thereby reducing the likelihood of seal failure during operation.

[0057] In one possible implementation, the first seal 3, the second seal 4, and the third seal 5 can be an integrally formed structure.

[0058] In one possible implementation, when the first seal 3 is a sealant, and the second seal 4 and the third seal 5 are stamped components on the generator 2 and the oil seal assembly 13 respectively, the first seal 3 can be connected to the second seal 4 and the third seal 5 simultaneously through the cooling and curing of the first seal 3.

[0059] In one specific implementation, such as Figure 1 and Figure 2 As shown, the oil pan 12 also includes an oil reservoir 121, the generator 2 also includes a stator (not shown in the figure) and a rotor (not shown in the figure), and the first seal 3 includes a first sealing section 31, a second sealing section 32 and a third sealing section 33.

[0060] The first sealing section 31 is disposed around the oil reservoir 121 and is used to seal the oil reservoir 121; one end of the second sealing section 32 is connected to the first sealing section 31 and the other end of the second sealing section 32 is connected to the second sealing element 4 to form a first annular sealing structure for sealing the oil reservoir 121, the stator and the rotor; one end of the third sealing section 33 is connected to the first sealing section 31 and the other end of the third sealing section 33 is connected to the third sealing element 5 to form a second annular sealing structure for sealing the oil reservoir 121 and the crankcase.

[0061] In this embodiment, by connecting the second sealing section 32 and the third sealing section 33 in parallel, they can be connected to the first sealing section 31 to form a first annular sealing structure and a second annular sealing structure, respectively. Furthermore, the first sealing section 31 can further connect the two annular sealing structures, which helps to further reduce the number of independent sealing components inside the range extender, thereby further reducing the assembly difficulty of the range extender and improving the sealing performance of each mating surface.

[0062] Specifically, the first sealing section 31 is located around the oil reservoir 121 to prevent oil from leaking from the oil reservoir 121 to the outside of the engine 1, thereby avoiding the risk of oil circulation pressure imbalance, ensuring the lubrication efficiency of the range extender lubrication system, and preventing dust or moisture from penetrating from the external environment into the engine 1, thus avoiding the risk of oil contamination, increasing the number of oil cycles, and extending the service life of the range extender. The first sealing section 31 can also be designed with a structure corresponding to the shape of the outer edge of the oil reservoir 121 to avoid the risk of leakage due to the special structure of the oil reservoir 121.

[0063] Specifically, the second sealing section 32 is located on the side of the first sealing section 31 facing the generator 2 and is connected to the first sealing section 31. The other end of the second sealing section 32 is connected to the second sealing element 4 to form a first annular sealing structure. This structure can prevent dust or moisture from penetrating into the engine 1 from the external environment, and also prevent the possibility of it penetrating into the generator 2 from the external environment. This can improve the oil utilization efficiency, as well as the stability and reliability of the stator and rotor during operation, thereby ensuring the working performance of the range extender.

[0064] Specifically, the third sealing section 33 is located on the side of the first sealing section 31 facing the oil seal assembly 13 and is connected to the first sealing section 31. The other end of the third sealing section 33 is connected to the third sealing element 5 to form a second annular sealing structure. This structure can prevent oil from leaking from the oil reservoir 121 to the outside of the engine 1, and also prevent the possibility of oil leaking from the crankcase to the inside of the generator 2. This ensures the stability of the lubrication system while improving the stability and reliability of the stator and rotor during operation, thereby ensuring the performance of the range extender.

[0065] It should be noted that the first sealing section 31, the second sealing section 32, and the third sealing section 33 are all located in the plane formed by the length and width directions of the range extender, and the second sealing element 4 and the third sealing element 5 are both located in the plane formed by the width and height directions of the range extender. That is, the second sealing element 4 is inclined or perpendicular to the second sealing section 32, and the third sealing element 5 is inclined or perpendicular to the third sealing section 33.

[0066] In one specific implementation, the first sealing section 31, the second sealing section 32, and the third sealing section 33 can be separate structures. This design allows each sealing section to be designed according to the working conditions at different locations, thereby further improving the sealing performance of the range extender.

[0067] In one specific embodiment, the first sealing section 31, the second sealing section 32, and the third sealing section 33 are integrally molded. This design eliminates gaps between the sealing sections, reducing the possibility of oil, dust, and moisture leaking or seeping through these gaps, thereby improving the sealing performance between the cylinder block 11 and the oil pan 12. Simultaneously, the integral molding design enhances the structural strength and elastic deformation capacity of the first seal 3, giving it stronger fatigue resistance and extending its service life, thus reducing the frequency of seal replacement. Furthermore, the integral molding design reduces the number of parts and assembly steps, improving the production efficiency of the first seal 3.

[0068] In one specific embodiment, along the length of the range extender, the area at the connection between the second sealing section 32 and the second sealing element 4 is greater than the area at the connection between the second sealing section 32 and the first sealing section 31.

[0069] In this embodiment, by setting a larger area at the connection between the second sealing section 32 and the second sealing element 4, the pressure distribution at the connection can be evenly dispersed, avoiding the risk of local stress concentration at the connection. This improves the sealing performance and pressure bearing capacity of the end of the second sealing section 32, reducing the possibility of oil leakage from the oil reservoir 121 to the outside of the engine 1, and the possibility of dust and moisture penetrating from the external environment into the engine 1 and generator 2. It also helps resist vibration or impact generated by the range extender during operation, extending the service life of the first sealing element 3, thereby further improving the sealing performance of the first annular sealing structure for the oil reservoir 121 and the inside of the generator 2. Simultaneously, when the range extender is operating in a high-temperature environment, the larger area at the connection between the second sealing section 32 and the second sealing element 4 allows for greater deformation space at the end of the second sealing section 32 during thermal expansion, preventing the possibility of separation between the engine 1 and generator 2 due to temperature differences, thus further improving the sealing performance at their joint surface. In addition, by setting the area at the connection between the second sealing section 32 and the second sealing element 4 to be larger, the assembly accuracy at the connection between the first sealing element 3 and the second sealing element 4 can be reduced, thereby avoiding the risk of seal failure due to installation errors.

[0070] In one possible implementation, the width of the second sealing section 32 may gradually increase along the direction in which it extends toward the generator 2.

[0071] In one possible implementation, the area at the connection between the second seal 4 and the first seal 3 is larger than the area at the rest of the second seal 4.

[0072] In one specific embodiment, along the length of the range extender, the area at the connection between the third sealing section 33 and the third sealing element 5 is greater than the area at the connection between the third sealing section 33 and the first sealing section 31.

[0073] In this embodiment, by setting a larger area at the connection between the third sealing section 33 and the third sealing element 5, the pressure distribution at the connection can be evenly dispersed, avoiding the risk of local stress concentration at the connection. This improves the sealing performance and pressure bearing capacity of the end of the third sealing section 33, reducing the possibility of oil leakage from the crankcase to the engine 1, and helping to resist vibrations or impacts generated by the range extender during operation, thus extending the service life of the first sealing element 3. This further improves the sealing performance of the second annular sealing structure for the oil reservoir 121 and the crankcase. Simultaneously, when the range extender is operating in a high-temperature environment, the larger area at the connection between the third sealing section 33 and the third sealing element 5 provides greater deformation space at the end of the third sealing section 33 during thermal expansion, preventing the possibility of separation between the crankcase and the oil seal assembly 13 due to temperature differences, thereby further improving the sealing performance at their interface. Furthermore, by setting a larger area at the connection between the third sealing section 33 and the third sealing element 5, the assembly precision at the connection between the first sealing element 3 and the third sealing element 5 can be reduced, thus avoiding the risk of seal failure due to installation errors.

[0074] In one possible implementation, the width of the third sealing section 33 gradually increases along the direction in which it extends toward the oil seal assembly 13.

[0075] In one possible implementation, the area at the connection between the third seal 5 and the first seal 3 is larger than the area at the rest of the third seal 5.

[0076] In one specific embodiment, at the connection between the second sealing section 32 and the second sealing member 4, the second sealing section 32 and / or the second sealing member 4 are provided with a first reinforcing rib (not shown in the figure) to divide the end of the second sealing section 32 and / or the second sealing member 4 into a plurality of first sealing spaces.

[0077] In this embodiment, by providing first reinforcing ribs at the ends of the second sealing section 32 and / or the second sealing element 4, the load they bear can be distributed, improving the bending, torsional, and compressive strength at the connection point. This avoids the risk of breakage at the connection point of the second sealing section 32 and the second sealing element 4 due to vibration, alternating loads, or high pressure, thereby improving the structural stability of the first annular sealing structure. Simultaneously, by providing multiple first reinforcing ribs, the ends of the second sealing section 32 and / or the second sealing element 4 are divided into multiple independent first sealing spaces. This ensures that oil, dust, and moisture remain within each first sealing space in the event of leakage or seepage from the range extender, further improving the range extender's sealing performance. Furthermore, the first reinforcing ribs also enhance the structural strength of the ends of the second sealing section 32 and the second sealing element 4, preventing the risk of sealing failure due to deformation caused by the compression of components.

[0078] In one possible implementation, the first reinforcing rib located at the end of the second sealing section 32 can be distributed crosswise along the length and width directions of the range extender, and / or the first reinforcing rib located at the end of the second sealing element 4 can be distributed crosswise along the width and height directions of the range extender to form a grid-like structure, so as to achieve lightweight design while improving sealing performance.

[0079] In one specific implementation, such as Figure 2 As shown, the third sealing section 33 and / or the third sealing element 5 are provided with a second reinforcing rib 51, which is used to divide the end of the third sealing section 33 and / or the third sealing element 5 into a plurality of second sealing spaces.

[0080] In this embodiment, by providing second reinforcing ribs 51 at the ends of the third sealing section 33 and / or the third sealing element 5, the load can be distributed, improving the bending, torsional, and compressive strength at the connection point. This avoids the risk of breakage at the connection point between the third sealing section 33 and the third sealing element 5 due to vibration, alternating loads, or high pressure, thereby improving the structural stability of the second annular sealing structure. Simultaneously, by providing multiple second reinforcing ribs 51, the ends of the third sealing section 33 and / or the third sealing element 5 are divided into multiple independent second sealing spaces. This ensures that oil, dust, and moisture remain within each second sealing space in the event of leakage or seepage in the range extender, further improving the range extender's sealing performance. Furthermore, the second reinforcing ribs 51 also enhance the structural strength of the ends of the third sealing section 33 and the third sealing element 5, preventing the risk of sealing failure due to deformation caused by the compression of various components.

[0081] In one possible implementation, the second reinforcing rib 51 located at the end of the third sealing section 33 may be distributed crosswise along the length and width directions of the range extender, and / or the second reinforcing rib 51 located at the end of the third sealing element 5 may be distributed crosswise along the width and height directions of the range extender to form a grid-shaped structure, so as to achieve lightweight design while improving sealing performance.

[0082] In one specific implementation, such as Figure 3 As shown, at least one of the cylinder block 11 and the oil pan 12 is provided with a first receiving groove 122 along the height direction of the range extender. The first receiving groove 122 is used to receive the first seal 3.

[0083] In this embodiment of the application, when the oil pan 12 is provided with a first receiving groove 122, the first receiving groove 122 can be arranged around the oil storage tank 121 to prevent oil from leaking from the oil storage tank 121 to the outside of the engine 1, and to prevent dust and moisture from penetrating from the outside of the engine 1 into the oil storage tank 121.

[0084] Therefore, by providing a first receiving groove 122 to accommodate the first seal 3, precise positioning of the first seal 3 can be achieved, reducing assembly errors and improving installation efficiency. Specifically, the first receiving groove 122 restricts the displacement of the first seal 3 along the length and width directions of the range extender, reducing the possibility of the first seal 3 detaching from the first receiving groove 122 and improving installation stability. This, in turn, enhances the sealing reliability of the first seal 3 at the mating surfaces of the cylinder block 11 and the oil pan 12. Furthermore, since the first seal 3 is located within the first receiving groove 122, when the first seal 3 is deformed by compression or thermally expanded, the first receiving groove 122 also prevents separation from the mating surfaces of the cylinder block 11 and the oil pan 12.

[0085] In one possible implementation, the cross-sectional shape of the first receiving groove 122 along the height direction of the range extender can be one of the following: triangular, rectangular, trapezoidal, and semi-circular.

[0086] In one specific implementation, such as Figure 3 As shown, the width of the first receiving groove 122 is L1, and L1 satisfies 3mm≤L1≤5mm.

[0087] In this embodiment of the application, the width of the first receiving groove 122 can be 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0088] When the width of the first receiving groove 122 meets the requirement of 3mm≤L1≤5mm, the width of the first receiving groove 122 is moderate, making it more suitable for the size of the first seal 3. This can prevent the first seal 3 from being over-compressed and causing excessive wear, and can also prevent gaps between the first seal 3 and the inner wall of the first receiving groove 122. This is beneficial to improving the stability and reliability of the installation of the first seal 3, and can ensure that the first seal 3 has a suitable compression ratio during the assembly of the range extender. As a result, the first seal 3 can still seal the mating surface of the cylinder block 11 and the oil pan 12 during elastic deformation, thereby improving the sealing performance of the range extender and improving the stability and reliability of the range extender during operation.

[0089] In one specific embodiment, the depth of the first receiving groove 122 is H1, and H1 satisfies 0.5mm≤H1≤1.5mm.

[0090] In this embodiment of the application, the depth of the first receiving groove 122 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0091] When the depth of the first receiving groove 122 satisfies 0.5mm≤H1≤1.5mm, the depth of the first receiving groove 122 is moderate. This not only avoids the risk that the first seal 3 cannot be fully compressed, resulting in the failure to form an effective sealing contact surface, but also avoids the risk that the first seal 3 is prone to displacement and detachment from the first receiving groove 122. This is beneficial to improving the stability and reliability of the installation of the first seal 3, reducing the possibility of displacement of the first seal 3 due to vibration and thermal expansion, and the appropriate depth eliminates the need to prepare a first seal 3 with a large cross-sectional area, so as to reduce the amount of production materials input during the production process, thereby reducing the production cost of the first seal 3.

[0092] In one specific implementation, such as Figure 1 and Figure 4 As shown, the inner edge of the cylinder block 11 is provided with a first chamfer 111, and the inner edge of the oil pan 12 is provided with a second chamfer 123. Along the height direction of the range extender, the first chamfer 111 and the second chamfer 123 form a second receiving groove 6. The second receiving groove 6 is used to receive a fourth seal (not shown in the figure). The fourth seal is used to seal the inner edge of the joint between the cylinder block 11 and the oil pan 12.

[0093] In this embodiment, the second receiving groove 6, formed by the first chamfer 111 and the second chamfer 123, is located inside the engine 1 and is used to receive the fourth seal. The fourth seal seals the inner edge of the joint between the cylinder block 11 and the oil pan 12, thereby further improving the sealing performance of the joint and ensuring the stability and reliability of the lubrication system during operation.

[0094] The second receiving groove 6 can limit the displacement of the fourth seal, preventing the fourth seal from detaching from the second receiving groove 6 under the impact of the engine oil. This helps to improve the installation stability of the fourth seal, thereby ensuring the sealing reliability of the joint between the cylinder block 11 and the oil pan 12.

[0095] Meanwhile, when the first seal 3 is provided on the mating surface of the cylinder block 11 and the oil pan 12, the fourth seal can form a double sealing structure with the first seal 3. The fourth seal is used to seal the inner edge of the mating surface of the cylinder block 11 and the oil pan 12, and the first seal 3 is used to seal the mating surface of the cylinder block 11 and the oil pan 12. This helps to further reduce the possibility of oil leakage from the oil reservoir 121 to the outside of the engine 1, and reduces the possibility of dust and moisture penetrating from the outside of the engine 1 to the oil reservoir 121, thereby further ensuring the stability and reliability of the engine 1 during operation.

[0096] Furthermore, when the first seal 3 is made of sealant, there is a possibility of overflow during engine 1 assembly, as the first seal 3 located between the cylinder block 11 and the oil pan 12 may overflow. By setting the first chamfer 111 and the second chamfer 123, the overflowing sealant can be guided and confined within the second receiving groove 6, making it a fourth seal or part of a fourth seal. This design avoids sealant waste, reduces production costs, and improves assembly efficiency. Moreover, when the overflowing sealant serves as the fourth seal, the step of installing a separate fourth seal can be omitted, reducing the assembly difficulty of the engine 1 and simplifying its assembly process.

[0097] In one specific implementation, such as Figure 4 As shown, the width of the second receiving groove 6 is L2, and L2 satisfies 4mm≤L2≤6mm.

[0098] In this embodiment of the application, the width of the second receiving groove 6 can be 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, etc.

[0099] When the width of the second receiving groove 6 meets the requirement of 4mm≤L2≤6mm, the width of the second receiving groove 6 is moderate, making it more compatible with the size of the fourth seal. This can avoid the fourth seal not being able to seal properly and also avoid gaps between the fourth seal and the inner wall of the second receiving groove 6. This is beneficial to improving the stability and reliability of the fourth seal installation, thereby ensuring the sealing performance of the fourth seal at the inner edge of the joint between the cylinder block 11 and the oil pan 12, and thus ensuring the stability and reliability of the range extender during operation.

[0100] In one specific implementation, such as Figure 4 As shown, the depth of the second receiving groove 6 is H2, and H2 satisfies 0.5mm≤H2≤1.5mm.

[0101] In this embodiment of the application, the depth of the second receiving groove 6 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0102] When the depth of the second receiving groove 6 meets the condition 0.5mm≤H2≤1.5mm, the depth of the second receiving groove 6 is moderate. This can prevent the fourth seal from falling off easily and also prevent residual oil from remaining in the second receiving groove 6. This is beneficial to improve the sealing performance of the inner edge of the joint between the cylinder block 11 and the oil pan 12 through the fourth seal, while reducing the possibility of excess gaps in the second receiving groove 6.

[0103] In one possible implementation, when the fourth seal is located within the second receiving groove 6 along the length and width directions of the range extender, the fourth seal is flush with the side wall of the oil reservoir 121.

[0104] In one specific implementation, such as Figure 4 As shown, the angle between the side wall of the second receiving tank 6 and the height direction of the range extender is α, and α satisfies 5°≤α≤15°.

[0105] In this embodiment of the application, the angle between the side wall of the second receiving groove 6 and the height direction of the range extender can be 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, etc.

[0106] When the angle between the sidewall of the second receiving groove 6 and the height direction of the range extender is 5°≤α≤15°, the inclination angle of the sidewall of the second receiving groove 6 is moderate. This can prevent the fourth seal from easily falling out of the second receiving groove 6 and also prevent there from being an excessive gap between the fourth seal and the second receiving groove 6. This is beneficial to improving the fit between the receiving space of the second receiving groove 6 and the fourth seal. Thus, while ensuring good sealing of the inner edge of the joint between the cylinder block 11 and the oil pan 12, the amount of fourth seal required is reduced, thereby reducing production costs.

[0107] In one possible implementation, the cross-sectional shape of the first receiving groove 122 along the height direction of the range extender can be triangular.

[0108] In other possible implementations, the cross-sectional shape of the first receiving groove 122 along the height direction of the range extender can be one of a rectangle, a trapezoid, and a semicircle.

[0109] In one specific implementation, such as Figure 3 As shown, along the length and width directions of the range extender, the distance between the side wall of the first receiving groove 122 and the bottom wall of the second receiving groove 6 is L3, and L3 satisfies 3mm≤L3≤5mm.

[0110] In this embodiment of the application, the distance between the inner edge of the first receiving groove 122 and the bottom wall of the second receiving groove 6 can be 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0111] When the distance between the side wall of the first receiving groove 122 and the bottom wall of the second receiving groove 6 is 3mm≤L3≤5mm, the distance between the side wall of the first receiving groove 122 near the oil reservoir 121 and the bottom wall of the second receiving groove 6 is moderate. When the first sealing element 3 is a sealant, the sealant can overflow into the second receiving groove 6 under the action of extrusion, thereby forming a fourth sealing element to improve the sealing performance of the inner edge of the joint between the cylinder block 11 and the oil pan 12.

[0112] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this application. The above description is only a preferred embodiment of this application, but this application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of this application, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, should be within the protection scope of this application.

Claims

1. A range extender, characterized in that, The range extender includes a connected engine and a generator; The engine includes a cylinder block and an oil pan distributed along the height direction of the range extender, and a first seal is provided between the cylinder block and the oil pan; The generator is located on one side of the engine along the length of the range extender, and a second seal is provided between the generator and the engine; The engine also includes an oil seal assembly located on the side of the engine facing the generator, and a third seal is provided between the oil seal assembly and the cylinder block; Wherein, along the length and / or width direction of the range extender, the second seal and the third seal are spaced apart, at least a portion of the first seal is connected to the second seal, and at least a portion of the first seal is connected to the third seal to form a three-dimensional annular sealing structure.

2. The range extender according to claim 1, characterized in that, The engine also includes a crankcase, the oil pan also includes an oil reservoir, the generator also includes a stator and a rotor, and the first seal includes a first sealing section, a second sealing section and a third sealing section; The first sealing section is disposed on the periphery of the oil storage tank, and the first sealing section is used to seal the oil storage tank; One end of the second sealing section is connected to the first sealing section, and the other end of the second sealing section is connected to the second sealing element to form a first annular sealing structure for sealing the oil reservoir, the stator, and the rotor. One end of the third sealing section is connected to the first sealing section, and the other end of the third sealing section is connected to the third sealing element to form a second annular sealing structure for sealing the oil reservoir and the crankcase.

3. The range extender according to claim 2, characterized in that, Along the length of the range extender, the area at the connection between the second sealing section and the second sealing element is greater than the area at the connection between the second sealing section and the first sealing section, and / or, the area at the connection between the third sealing section and the third sealing element is greater than the area at the connection between the third sealing section and the first sealing section.

4. The range extender according to claim 2, characterized in that, At the connection between the second sealing section and the second sealing member, the second sealing section and / or the second sealing member are provided with a first reinforcing rib, which is used to divide the end of the second sealing section and / or the second sealing member into a plurality of first sealing spaces; At the connection between the third sealing section and the third sealing element, the third sealing section and / or the third sealing element are provided with a second reinforcing rib, which is used to divide the end of the third sealing section and / or the third sealing element into a plurality of second sealing spaces.

5. The range extender according to claim 2, characterized in that, The first sealing section, the second sealing section, and the third sealing section are integrally formed.

6. The range extender according to any one of claims 1-5, characterized in that, Along the height direction of the range extender, at least one of the cylinder block and the oil pan is provided with a first receiving groove, the first receiving groove being used to receive the first seal.

7. The range extender according to claim 6, characterized in that, The width of the first receiving groove is L1, and L1 satisfies 3mm≤L1≤5mm. The depth of the first receiving groove is H1, and H1 satisfies 0.5mm≤H1≤1.5mm.

8. The range extender according to any one of claims 1-5, characterized in that, The cylinder block has a first chamfer on its inner edge and the oil pan has a second chamfer on its inner edge. Along the height direction of the range extender, the first chamfer and the second chamfer form a second receiving groove. The second receiving groove is used to receive a fourth seal. The fourth seal is used to seal the inner edge of the joint between the cylinder block and the oil pan.

9. The range extender according to claim 8, characterized in that, The width of the second receiving groove is L2, and L2 satisfies 4mm≤L2≤6mm. The depth of the second receiving groove is H2, and H2 satisfies 0.5mm≤H2≤1.5mm. The angle between the sidewall of the second receiving groove and the height direction of the range extender is α, and α satisfies 5°≤α≤15°.

10. The range extender according to claim 8, characterized in that, At least one of the cylinder block and the oil pan is provided with a first receiving groove for accommodating the first seal. The distance between the side wall of the first receiving groove and the bottom wall of the second receiving groove along the length and width directions of the range extender is L3, and L3 satisfies 3mm≤L3≤5mm.

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