Engine assembly and vehicle

Abstract

This disclosure relates to an engine assembly and a vehicle, belonging to the field of vehicle technology. The engine assembly includes a cylinder head, a cylinder block, and a three-way catalytic converter. The cylinder block and cylinder head are connected. The outer wall of the cylinder block has a drive shaft support. The three-way catalytic converter includes a first housing, a second housing, and a catalytic element. The first housing has a tubular structure and includes a straight pipe section and a curved pipe section that are connected to each other. The straight pipe section is connected to the cylinder head. The second housing is located above the drive shaft support. The second housing has a tubular structure and is connected to the curved pipe section. The catalytic element is located within the tubular structure of the second housing and is connected to the second housing. The curved pipe section allows the entire three-way catalytic converter to be located above the drive shaft support. This eliminates the need to consider the second housing's clearance from the drive shaft support and the drive shaft, allowing the three-way catalytic converter to remain close to the engine sidewall, thereby reducing wasted interior space in the vehicle.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and in particular to an engine assembly and a vehicle. Background Technology

[0002] The three-way catalytic converter is an important external purification device installed in the automobile engine and exhaust system. It can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction reactions.

[0003] In the related technologies of rear-mounted exhaust engines, the three-way catalytic converter is usually arranged vertically, located on the side of the engine, and corresponding to the height of the entire engine. At the same time, in order to avoid the drive shaft mounted on the engine side wall, the three-way catalytic converter needs to be a considerable distance away from the engine side wall.

[0004] With the above structure, it is also difficult to arrange other components between the three-way catalytic converter and the engine side wall, resulting in wasted space inside the vehicle. Summary of the Invention

[0005] This disclosure provides an engine assembly and a vehicle, which can solve the aforementioned technical problems existing in the related art. The technical solution is as follows:

[0006] In a first aspect, an engine assembly is provided, the engine assembly including a cylinder head, a cylinder block and a three-way catalytic converter;

[0007] The cylinder block and the cylinder head are connected, and the outer wall of the cylinder block has a drive shaft support;

[0008] The three-way catalytic converter includes a first housing, a second housing, and a catalytic element. The first housing has a tubular structure and includes a straight pipe section and a curved pipe section that are connected to each other. The straight pipe section is connected to the cylinder head. The second housing is located above the drive shaft support. The second housing has a tubular structure and is connected to the curved pipe section. The catalytic element is located inside the tubular structure of the second housing and is connected to the second housing.

[0009] Optionally, the three-way catalytic converter further includes an oxygen sensor, with an interface on the side wall of the first housing, the oxygen sensor being located at and connected to the interface.

[0010] Optionally, the three-way catalytic converter further includes a ventilation pipe connected to the bend section.

[0011] Optionally, the bend has an arc-shaped structure.

[0012] Optionally, the diameter of the bend gradually increases from the first end to the second end, the first end being the end where the bend is connected to the straight section, and the second end being the end where the bend is connected to the second shell.

[0013] Optionally, the straight pipe section and the bent pipe section are integrally formed.

[0014] Optionally, the second housing is fitted to the outer wall of the cylinder.

[0015] Optionally, the first housing has one or more first connecting portions connected to the cylinder head.

[0016] Optionally, the second housing has one or more second connecting portions connected to the cylinder body.

[0017] In a second aspect, a vehicle is provided, the vehicle comprising the engine assembly described in any one of the first aspects.

[0018] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0019] In this embodiment, the outer wall of the cylinder block has a drive shaft support. The first housing of the three-way catalytic converter includes a straight pipe section and a curved pipe section connected together. The straight pipe section is connected to the cylinder head, and the curved pipe section is connected to the second housing, which is located above the drive shaft support. The curved pipe section allows the entire three-way catalytic converter to be positioned above the drive shaft support. This eliminates the need to consider the second housing's clearance from the drive shaft support and drive shaft, allowing the three-way catalytic converter to remain close to the engine sidewall, thereby reducing wasted interior space in the vehicle.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an engine assembly provided in an embodiment of this disclosure;

[0023] Figure 2 This is a schematic diagram of the structure of a three-way catalytic converter provided in an embodiment of this disclosure.

[0024] Figure label:

[0025] Cylinder head 1, cylinder block 2, drive shaft support 21;

[0026] Three-way catalytic converter 3, first housing 31, straight pipe section 311, bent pipe section 312, interface 313, first connecting part 314, second housing 32, second connecting part 321;

[0027] 4. Ventilation duct; 5. Exhaust gas recirculation device. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0029] This disclosure provides an engine assembly, with reference to... Figure 1 As shown, Figure 1 This is a schematic diagram of an engine assembly provided in an embodiment of the present disclosure. The engine assembly may include a cylinder head 1, a cylinder block 2, and a three-way catalytic converter 3.

[0030] The following is a description of each component of the engine assembly:

[0031] 1. Cylinder head 1

[0032] The cylinder head 1 may have an exhaust flange (not shown in the attached figure). The exhaust gas generated by the operation of the cylinder elements of the engine assembly can be discharged to the outside of the cylinder elements through the exhaust flange. At the same time, the exhaust flange can be connected to the three-way catalytic converter 3. The exhaust gas generated by the operation of the cylinder elements passes through the exhaust flange and enters the three-way catalytic converter 3. The three-way catalytic converter 3 can convert harmful gases (such as CO, HC and NOx) in the exhaust gas into harmless gases (such as carbon dioxide, water vapor and nitrogen) through a preset chemical reaction, thereby meeting the relevant emission standards of the vehicle.

[0033] 2. Cylinder block 2

[0034] The cylinder block 2 is connected to the cylinder head 1. The cylinder block 2 has a hollow cavity. After the fuel enters the space formed by the cylinder block 2 and the cylinder head 1, it is ignited. The combustion of the fuel can produce high temperature and high pressure gas. The high temperature and high pressure gas pushes the relevant components (e.g., piston) in the cylinder block 2 to move, so as to perform work.

[0035] This disclosure does not specifically limit the connection relationship between the cylinder block 2 and the cylinder head 1. For example, a flange connection can be used, with a flange face on the cylinder head 1 and the cylinder block 2 respectively. The two flange faces are tightly connected together by bolts and nuts. The flange connection is easy to disassemble and can transmit a large torque. A threaded connection can also be used, with internal threads pre-drilled on the cylinder head 1. The connection is achieved by screwing into the corresponding threaded hole on the cylinder block 2. Tie rod connection, welding, and other connection methods can also be used. The specific connection method can be matched and set according to the usage scenario of the engine assembly and the connection strength between the cylinder block 2 and the cylinder head 1 of different vehicles.

[0036] A cylinder gasket may be provided between the cylinder block 2 and the cylinder head 1. The cylinder gasket can ensure the overall sealing of the cylinder head 1 and the cylinder block 2 after they are connected, and prevent the leakage of gas (e.g., high temperature and high pressure gas generated by combustion) and liquid (e.g., coolant) inside the cylinder block 2.

[0037] The outer wall of the cylinder block 2 has a drive shaft support 21, which is used to support the drive shaft of the vehicle. The position of the drive shaft is usually related to the specific structure of the cylinder element in the engine assembly. The position of the drive shaft relative to the cylinder block 2 is not easily changed.

[0038] 3. Three-way catalytic converter

[0039] The three-way catalytic converter is an important purification device in the engine assembly. It converts harmful gases such as CO, HC, and NOx in the exhaust gases produced by cylinder elements into harmless gases such as carbon dioxide, water, and nitrogen through oxidation and reduction reactions. (Refer to...) Figure 2 As shown, Figure 2 This is a schematic diagram of a three-way catalytic converter 3 provided in an embodiment of the present disclosure. The three-way catalytic converter 3 may include a first housing 31, a second housing 32, and a catalytic element (not shown in the figure). The various components of the three-way catalytic converter 3 are described below:

[0040] 3.1. First shell 31

[0041] The first housing 31 is connected to the cylinder head 1. For example, the first housing 31 has one or more first connecting parts 314, the first connecting parts 314 have through holes or threaded holes, the cylinder head 1 has through holes or threaded grooves corresponding to the first connecting parts 314, and the first connecting parts 314 and the cylinder head 1 are connected by screws, bolts or other components to achieve threaded fastening connection.

[0042] This disclosure does not specifically limit the number of the first connecting parts 314, but can match and set them according to factors such as the volume and shape of the first housing 31 and the connection strength between the first housing 31 and the cylinder head 1.

[0043] This disclosure does not specifically limit the shape of the first connecting part 314. It can be matched and set according to factors such as the size and shape of the space in which the first connecting part 314 is arranged. Multiple first connecting parts 314 may have the same shape or different shapes.

[0044] This disclosure does not limit the relative position of the first connecting part 314 to other areas of the first housing 31. The first connecting part 314 can be connected to the straight pipe section 311 or the bent pipe section 312. Specifically, it can be matched and set according to factors such as the volume and shape of the straight pipe section 311 and the bent pipe section 312.

[0045] The first housing 31 has a tubular structure. The exhaust gas generated by the operation of the cylinder element enters the tubular structure of the first housing 31 from the inside of the cylinder body 2 through the exhaust flange of the cylinder head 1. After passing through the tubular structure of the first housing 31, the exhaust gas can enter the second housing 32.

[0046] The three-way catalytic converter 3 may also include an oxygen sensor (not shown in the figures). An interface 313 is located on the side wall of the first housing 31, and the oxygen sensor is located and connected to the interface 313. The oxygen sensor monitors the oxygen content of the gas in the cavity of the first housing 31 and feeds this information back to the vehicle's engine control unit (ECU). The ECU can adjust the air-fuel mixture supply based on changes in oxygen content to ensure optimal combustion efficiency and emission control of the engine assembly, thereby enabling the vehicle to achieve a more efficient combustion process and reduce the generation of harmful emissions.

[0047] The first housing 31 may include a straight pipe section 311 and a bend section 312 that are connected, and the straight pipe section 311 and the bend section 312 can be integrally formed. On the one hand, the integrally formed straight pipe section 311 and bend section 312 have no connection points or connection areas, which can provide higher strength and rigidity and avoid cracks or damage at the connection between the straight pipe section 311 and the bend section 312 due to stress concentration or other reasons. On the other hand, the integral forming maintains the continuity of the material, and there are no welding or other connection points, which can avoid the reduction of airtightness due to errors or defects in the connection process. Thus, exhaust gas can be discharged into the external environment from the poorly sealed connection, thereby causing damage and pollution to the external environment by harmful substances in the exhaust gas.

[0048] 3.1.1. Straight pipe section 311

[0049] The straight pipe section 311 is connected to the cylinder head 1. The cavity of the straight pipe section 311 may contain a turbocharger. The turbocharger is connected to the inner wall of the straight pipe section 311. The turbocharger can increase the pressure and flow rate of the gas flowing through it to ensure that the exhaust gas generated inside the cylinder 2 is discharged in time. The compressed gas can also re-enter the interior of the cylinder 2 through the ventilation pipe 4 and the exhaust gas recirculation device 5, thereby improving the combustion efficiency of fuel, reducing fuel consumption, and reducing the generation of harmful emissions.

[0050] 3.1.2. Bend section 312

[0051] One end of the bent pipe section 312 is connected to the straight pipe section 311, and the other end is connected to the air intake end of the second housing 32. The setting of the bent pipe section 312 can reduce the extension of the second housing 32 in the first direction while ensuring the normal flow of exhaust gas. The first direction is the extension direction of the side wall of the cylinder 2 towards the ground. At this time, the space occupied by the second housing 32 in the first direction in this embodiment of the present disclosure is further reduced, and the space of the three-way catalytic converter 3 inside the vehicle is further reduced, which is conducive to reserving more space in the first direction for the arrangement of the surrounding components of the three-way catalytic converter 3.

[0052] At the same time, it can also avoid the second housing 32 from avoiding the drive shaft support 21 and the drive shaft, thereby reducing the distance between the second housing 32 and the side wall of the cylinder 2 and reducing the space occupied by the three-way catalytic converter 3.

[0053] This disclosure does not specifically limit the size and shape of the bend section 312, but can match and set it according to factors such as the position of the drive shaft support 21 and the shape and size of the second housing 32.

[0054] The bend section 312 can have an arc-shaped structure. On the one hand, the arc-shaped structure, due to its continuous curve, can provide a more uniform stress distribution under stress, helping to reduce stress concentration, thereby improving the structural strength of the bend section 312 and increasing its service life. On the other hand, the arc-shaped structure has a simpler manufacturing process and generates less waste, which helps to reduce the processing cost of the bend section 312 and simplify the manufacturing process. At the same time, the arc-shaped structure of the bend section 312 can provide better hydrodynamic characteristics, improve the flow efficiency of its internal gas, and avoid the bend section 312 generating large resistance to the flow of exhaust gas, thus affecting the exhaust gas treatment capacity of the three-way catalytic converter 3.

[0055] The diameter of the bend section 312 gradually increases from the first end 312a to the second end 312b. The first end 312a is the end where the bend section 312 connects to the straight section 311, and the second end 312b is the end where the bend section 312 connects to the second housing 32. The second housing 32 houses a catalytic element, so its inner wall diameter is relatively large. To increase the waste flow rate and reduce space occupation, the inner wall diameter of the straight section 311 is relatively small. The bend section 312 is located between the straight section 311 and the second housing 32. The gradually increasing diameter of the bend section 312 has the following advantages: First, the exhaust gas flow rate can be gradually adjusted to adapt to the change in the diameter of the bend section 312, which helps to maintain the pressure stability inside the bend section 312; Second, it can reduce noise and vibration caused by hydrodynamic effects and improve the driver's driving experience; Third, the exhaust gas flow rate changes more slowly, and the gradually increasing diameter can reduce the erosion and wear of the inner wall of the bend section 312 by the exhaust gas, especially when the exhaust gas contains solid particles.

[0056] 3.2. Second shell 32

[0057] In related technologies, the second housing 32 needs to avoid the drive shaft support 21 and the drive shaft, resulting in a large distance between it and the side wall of the cylinder 2. That is, the distance between the second housing 32 and the side wall of the cylinder 2 is large in the second direction, which is the direction in which the second housing 32 points to the side wall of the cylinder 2. The second direction is perpendicular to the first direction.

[0058] In this embodiment, the second housing 32 is located above the drive shaft support 21. The second housing 32 does not need to avoid the drive shaft support 21 and the drive shaft. Therefore, the arrangement of the second housing 32 can be close to the side wall of the cylinder block 2 in the second direction. Compared with related technologies, the second housing 32 in this embodiment occupies less space in the second direction, and the space of the three-way catalytic converter 3 inside the vehicle is further reduced, which is beneficial to reserve more space for the arrangement of the surrounding components of the three-way catalytic converter 3.

[0059] The second housing 32 can fit against the outer wall of the cylinder 2. The second housing 32 does not need to avoid the drive shaft support 21 and the drive shaft. Therefore, the arrangement position of the second housing 32 can fit against the outer wall of the cylinder 2. At this time, the space occupied by the second housing 32 in the second direction in this embodiment of the present disclosure is further reduced, and the space of the three-way catalytic converter 3 inside the vehicle is further reduced, which is conducive to reserving more space in the second direction for the arrangement of the surrounding components of the three-way catalytic converter 3.

[0060] The second housing 32 is connected to the cylinder 2. For example, the second housing 32 has one or more second connecting parts 321. The second connecting parts 321 have through holes or threaded holes. The cylinder 2 has through holes or threaded grooves corresponding to the first connecting parts 314. The second connecting parts 321 and the cylinder 2 are connected by screws, bolts or other components to achieve threaded fastening.

[0061] This disclosure does not specifically limit the number of the second connecting parts 321, but can match and set them according to factors such as the volume and shape of the second housing 32 and the connection strength between the second housing 32 and the cylinder 2.

[0062] This disclosure does not specifically limit the shape of the second connecting part 321. It can be matched and set according to factors such as the size and shape of the space in which the second connecting part 321 is arranged. Multiple second connecting parts 321 may have the same shape or different shapes.

[0063] This disclosure does not limit the relative position of the second connecting part 321 to other regions of the second housing 32. For example, the second connecting part 321 may be evenly distributed along the circumferential direction of the outer wall of the second housing 32, or evenly distributed along the axial direction of the outer wall of the second housing 32. Specifically, it can be matched and set according to factors such as the volume and shape of the second housing 32.

[0064] The second housing 32 has a tubular structure and is connected to the bent pipe section 312. The exhaust gas generated by the operation of the cylinder element enters the first housing 31 from the inside of the cylinder block 2 through the exhaust flange of the cylinder head 1. After flowing through the straight pipe section 311 and the bent pipe section 312 in sequence, it can enter the tubular structure of the second housing 32. The catalytic element located in the cavity of the second housing 32 reacts chemically with the exhaust gas. The harmless exhaust gas obtained by the chemical reaction flows out from the outlet end of the second housing 32 and flows into subsequent elements (e.g., exhaust front pipe).

[0065] 3.3. Catalytic element

[0066] The catalytic element is located inside the tubular structure of the second housing 32 and is connected to the second housing 32. The catalytic element may include a support carrier and a catalyst. The support carrier is connected to the inner wall of the second housing 32. The support carrier may be made of a honeycomb structure of ceramic or metal to increase the contact area between the exhaust gas and the catalyst.

[0067] The catalyst is distributed on and connected to the support. The catalyst can be composed of one or more of platinum, rhodium, and palladium in a predetermined ratio. For example, platinum can promote the oxidation of carbon monoxide (CO) and hydrocarbons (HC), converting these harmful gases into carbon dioxide and water; rhodium can promote the reduction of nitrogen oxides (NOx), converting these gases into nitrogen and oxygen; palladium can promote the oxidation of carbon monoxide (CO) and hydrocarbons (HC) at lower temperatures and also has a certain catalytic effect on the reduction of nitrogen oxides (NOx).

[0068] 3.4. Ventilation duct 4

[0069] The three-way catalytic converter 3 may also include a ventilation pipe 4, which is connected to a bend section 312. The exhaust gas pressure before entering the second housing 32 is relatively high. The ventilation pipe 4 is connected to the bend section 312 located before the second housing 32, which can ensure that the amount of exhaust gas entering the ventilation pipe 4 is sufficient. Other components of the vehicle (e.g., exhaust gas recirculation device 5) can be connected to the ventilation pipe 4 to obtain sufficient exhaust gas for subsequent related work.

[0070] Based on the same concept, this disclosure also provides a vehicle that may include an engine assembly as described in any of the above embodiments.

[0071] It is understood that the vehicle provided in this disclosure includes hardware structures and / or software modules corresponding to the execution of each function in order to achieve the above-mentioned functions. In conjunction with the units and algorithm steps of the various examples disclosed in this disclosure, this disclosure can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the technical solutions of this disclosure.

[0072] The vehicle may also include an Exhaust Gas Recirculation (EGR) system 5, located above the cylinder head 1. The EGR system 5 can be directly connected to the ventilation pipe 4 of the three-way catalytic converter 3. The EGR system 5 mixes collected exhaust gases with fresh air and fuel before entering the combustion chamber of the cylinder block 2. Because the exhaust gases contain inert gases, they slow down the combustion rate and lower the combustion temperature. This reduces the formation of nitrogen oxides (NOx) and effectively controls engine emissions. The operation of the EGR system 5 can be monitored and adjusted by the vehicle's electronic control unit (ECU) to ensure optimal emission control and performance.

[0073] At this time, on the one hand, under the influence of the large exhaust gas pressure, the exhaust gas recirculation device 5 can obtain sufficient exhaust gas to participate in the fuel combustion process of the engine assembly, reducing the generation of harmful substances; on the other hand, the ventilation pipe 4 has a short pipe length, which can reduce the space occupied by the ventilation pipe 4 and reserve more space for the arrangement of the components around the three-way catalytic converter 3.

[0074] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0076] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0077] It is further understood that the terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0078] It is further understood that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the two components; they can refer to a direct connection between two components without the presence of other components, or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0079] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0080] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the scope of the claims.

[0081] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An engine assembly, characterized in that, The engine assembly includes a cylinder head (1), a cylinder block (2), and a three-way catalytic converter (3); The cylinder body (2) is connected to the cylinder head (1), and the outer wall of the cylinder body (2) has a drive shaft support (21). The three-way catalytic converter (3) includes a first housing (31), a second housing (32), and a catalytic element. The first housing (31) has a tubular structure and includes a straight pipe section (311) and a bent pipe section (312) that are connected to each other. The straight pipe section (311) is connected to the cylinder head (1). The bent pipe section (312) has an arc-shaped structure. The diameter of the bent pipe section (312) gradually increases from the first end (312a) to the second end (312b). The first end (312a) is... The bent pipe section (312) is connected to one end of the straight pipe section (311), and the second end (312b) is the end of the bent pipe section (312) connected to the second housing (32). The second housing (32) has a tubular structure. The second housing (32) is located above the drive shaft support (21) and is connected to the bent pipe section (312). The catalyst element is located inside the tubular structure of the second housing (32) and is connected to the second housing (32).

2. The engine assembly according to claim 1, characterized in that, The three-way catalytic converter (3) also includes an oxygen sensor; The first housing (31) has an interface (313) on its side wall, and the oxygen sensor is located in and connected to the interface (313).

3. The engine assembly according to claim 1, characterized in that, The three-way catalytic converter (3) also includes a ventilation pipe (4), which is connected to the bend section (312).

4. The engine assembly according to claim 1, characterized in that, The straight pipe section (311) and the bent pipe section (312) are integrally formed.

5. The engine assembly according to claim 1, characterized in that, The second housing (32) is attached to the outer wall of the cylinder (2).

6. The engine assembly according to claim 1, characterized in that, The first housing (31) has one or more first connecting parts (314) connected to the cylinder head (1).

7. The engine assembly according to claim 1, characterized in that, The second housing (32) has one or more second connecting parts (321) connected to the cylinder (2).

8. A vehicle, characterized in that, The vehicle includes an engine assembly as described in any one of claims 1-7.

Images