horizontally opposed engine

Abstract

The utility model discloses a horizontally opposed engine. The horizontally opposed engine comprises a body, a crankshaft and a first bearing. The body has a first bearing hole. The crankshaft comprises a first main journal, a first crank arm and a first connecting rod neck. The main journal is located in the first bearing hole. The first crank arm is connected to the first main journal. The first connecting rod neck is connected to the first crank arm, and the first connecting rod neck and the first main journal are distributed in a radial direction of the crankshaft. A first bearing sleeve is sleeved on the first main journal and connected to the first main journal. The first bearing is connected to the body, and the first bearing is in transition fit with the first bearing hole. The body is a one-piece structure, and the diameter of the crankshaft is smaller than the diameter of the first bearing hole. The horizontally opposed engine has low cost, good stability, small vibration, long service life and facilitates the installation of the crankshaft.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, and in particular relates to a horizontally opposed engine. Background Technology

[0002] For horizontally opposed engines, the engine block is divided into a left block and a right block to facilitate crankshaft installation. After the crankshaft is installed, the left and right blocks are assembled together.

[0003] However, adopting a split design for the engine not only requires the development of two sets of tooling molds, increasing costs, but also causes unstable engine performance, excessive vibration, and a short service life. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] This utility model provides a horizontally opposed engine, comprising: The body has a first bearing hole; A crankshaft, rotatably connected to the engine block, the crankshaft comprising: The first main journal is located in the first bearing hole; A first crank arm, the first crank arm being connected to a first main journal; and A first connecting rod journal, connected to the first crank arm, the first connecting rod journal and the first main journal being radially staggered along the crankshaft; and The first bearing is sleeved on and connected to the first main journal, and is connected to the machine body. The first bearing is transitionally fitted with the first bearing hole. The body is a one-piece structure, and the diameter of the crankshaft is smaller than the diameter of the first bearing hole.

[0006] The horizontally opposed engine provided by this utility model includes a block, a crankshaft, and a first bearing. The block is a one-piece structure, which, on the one hand, requires only one set of tooling molds to develop, resulting in low cost. On the other hand, it improves the stability of engine performance, reduces vibration, and extends service life. The first bearing is sleeved on the first main journal, and the first bearing has a transition fit with the first bearing hole. The diameter of the crankshaft is smaller than the diameter of the first bearing hole, facilitating crankshaft installation.

[0007] In some embodiments, the first bearing includes: First sub-bearing; and The second sub-bearing is detachably connected to the first sub-bearing.

[0008] By configuring the first bearing to include a first sub-bearing and a second sub-bearing, it is convenient to fit the first bearing onto the first main journal.

[0009] In some embodiments, a first fastener is further included, the first sub-bearing has a first connecting hole, the second sub-bearing has a first threaded hole, and the first fastener passes through the first connecting hole and is threadedly connected to the second sub-bearing through the first threaded hole.

[0010] By providing a first connecting hole on the first sub-bearing and a first threaded hole on the second sub-bearing, the first sub-bearing and the second sub-bearing can be connected conveniently and quickly using a first fastener, while simultaneously allowing the first bearing to be sleeved on and connected to the first main journal.

[0011] In some embodiments, the first sub-bearing has two first connecting holes, which are symmetrically distributed about the centerline of the first sub-bearing, and the second sub-bearing has two first threaded holes, with the first connecting holes and the first threaded holes corresponding one-to-one.

[0012] By setting two first connecting holes on the first sub-bearing and two first threaded holes on the second sub-bearing, the connection between the first and second sub-bearings is made more secure, while avoiding excessive vibration of the first bearing during use and improving the service life of the first bearing.

[0013] In some embodiments, a second fastener is further included, the body having a first mounting hole, one of the first sub-bearing and the second sub-bearing having a second threaded hole, the second fastener passing through the first mounting hole and threadedly connected to one of the first sub-bearing and the second sub-bearing through the second threaded hole.

[0014] By setting a first mounting hole on the machine body and a second threaded hole on either the first sub-bearing or the second sub-bearing, the connection and fixation between the first bearing and the machine body are achieved using a second fastener. The structure is simple and the operation is convenient.

[0015] In some embodiments, a second bearing is further included. The housing has a second bearing bore. The second bearing is transitionally fitted with the second bearing bore. The second bearing is connected to the housing. The crankshaft includes a second main journal. The second main journal and the first main journal are spaced apart along the axial direction of the crankshaft. The second main journal is coaxial with the first main journal. The second bearing is sleeved on the second main journal and connected to the second main journal. The diameter of the crankshaft is smaller than the diameter of the second bearing bore.

[0016] By setting a second bearing, which is sleeved on and connected to the second main journal, and with the second bearing bore transition fit, the diameter of the crankshaft is smaller than the diameter of the second bearing bore, which facilitates the installation of the crankshaft.

[0017] In some embodiments, the second bearing includes: Third sub-bearing; and A fourth sub-bearing, which is detachably connected to the third sub-bearing.

[0018] By configuring the second bearing to include a third sub-bearing and a fourth sub-bearing, it is convenient to fit the second bearing onto the second spindle journal.

[0019] In some embodiments, a third fastener is also included, wherein the third sub-bearing has a second connecting hole and the fourth sub-bearing has a third threaded hole, and the third fastener passes through the second connecting hole and is threadedly connected to the fourth sub-bearing through the third threaded hole.

[0020] By setting a second connecting hole on the third sub-bearing and a third threaded hole on the fourth sub-bearing, the third fastener can be used to conveniently and quickly connect the third sub-bearing and the fourth sub-bearing, while simultaneously allowing the second bearing to be sleeved on and connected to the second main journal.

[0021] In some embodiments, the third sub-bearing has two second connecting holes, which are symmetrically distributed about the centerline of the third sub-bearing, and the fourth sub-bearing has two third threaded holes, with the second connecting holes and the third threaded holes corresponding one-to-one.

[0022] By setting two second connecting holes on the third sub-bearing and two third threaded holes on the fourth sub-bearing, the connection between the third and fourth sub-bearings is made more secure, while avoiding excessive vibration of the second bearing during use and improving the service life of the second bearing.

[0023] In some embodiments, a fourth fastener is further included, the body has a second mounting hole, one of the third sub-bearing and the fourth sub-bearing has a fourth threaded hole, and the fourth fastener passes through the second mounting hole and is threadedly connected to one of the third sub-bearing and the fourth sub-bearing through the fourth threaded hole.

[0024] By setting a second mounting hole on the machine body and a fourth threaded hole on one of the third and fourth sub-bearings, the connection and fixation between the second bearing and the machine body are achieved using a fourth fastener. The structure is simple and the operation is convenient. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the crankshaft structure provided in one embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the body provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the crankshaft structure provided in one embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of a horizontally opposed engine provided in one embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of a horizontally opposed engine provided in one embodiment of the present invention. Figure 2 ; Figure 6 This is a cross-sectional view of a horizontally opposed engine provided in one embodiment of the present invention; Figure 7 This is a cross-sectional view of the first bearing and crankshaft assembled according to one embodiment of the present invention; Figure 8 This is a cross-sectional view of the second bearing and crankshaft after assembly according to one embodiment of the present invention.

[0027] Figure label: 1. Body; 11. Main body; 12. First bearing housing; 121. First bearing bore; 122. First mounting hole; 13. Second bearing housing; 131. Second bearing bore; 132. Second mounting hole; 14. Third bearing housing; 141. Third bearing bore; 2. Crankshaft; 21. First main journal; 22. First crank arm; 23. First connecting rod journal; 24. Second main journal; 25. Second crank arm; 26. Third crank arm; 27. Second connecting rod journal; 28. Fourth crank arm; 29. ​​Third main journal; 3. First bearing; 31. First sub-bearing; 311. First connecting hole; 312. Second threaded hole; 32. Second sub-bearing; 321. First threaded hole; 4. First fastener; 5. Second fastener; 6. Second bearing; 61. Third sub-bearing; 611. Second connecting hole; 612. Fourth threaded hole; 62. Fourth sub-bearing; 621. Third threaded hole; 7. Third fastener; 8. Fourth fastener; D1, the diameter of the first bearing bore; D2, the diameter of the crankshaft. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0029] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0030] A horizontally opposed engine includes a housing, a crankshaft, and a first bearing. The housing has a first bearing bore. The crankshaft is rotatably connected to the housing. The crankshaft includes a first main journal, a first crank arm, and a first connecting rod journal. The main journal is located in the first bearing bore. The first crank arm is connected to the first main journal. The first connecting rod journal is connected to the first crank arm. The first connecting rod journal and the first main journal are staggered radially along the crankshaft. The first bearing is fitted onto and connected to the first main journal. The first bearing is connected to the housing. The first bearing has a transition fit with the first bearing bore. The housing is a single-piece structure. The diameter of the crankshaft is smaller than the diameter of the first bearing bore.

[0031] The horizontally opposed engine provided by this utility model includes a block, a crankshaft, and a first bearing. The block is a one-piece structure, which, on the one hand, requires only one set of tooling molds to develop, resulting in low cost. On the other hand, it improves the stability of engine performance, reduces vibration, and extends service life. The first bearing is sleeved on the first main journal, and the first bearing has a transition fit with the first bearing hole. The diameter of the crankshaft is smaller than the diameter of the first bearing hole, facilitating crankshaft installation.

[0032] like Figure 1 As shown, in some embodiments, the horizontally opposed engine includes a crankshaft 2. The crankshaft 2 includes a first main journal 21, a first crank arm 22, a first connecting rod journal 23, a second crank arm 25, a second main journal 24, a third crank arm 26, a second connecting rod journal 27, a fourth crank arm 28, and a third main journal 29 connected sequentially. The first main journal 21, the second main journal 24, and the third main journal 29 are coaxial. The first main journal 21, the second main journal 24, and the third main journal 29 are spaced apart along the axial direction of the crankshaft 2. The first connecting rod journal 23 is radially staggered with the first main journal 21 along the radial direction of the crankshaft 2. The second connecting rod journal 27 is radially staggered with the first main journal 21 along the crankshaft 2.

[0033] Specifically, the first main journal 21 is a cylindrical structure. The second main journal 24 is a cylindrical structure. The third main journal 29 is a cylindrical structure.

[0034] like Figure 2 As shown, the horizontally opposed engine also includes a body 1. The body 1 is a one-piece structure. The body 1 includes a main body 11, a first bearing housing 12, a second bearing housing 13, and a third bearing housing 14. The first bearing housing 12, the second bearing housing 13, and the third bearing housing 14 are all connected to the main body 11. The first bearing housing 12, the second bearing housing 13, and the third bearing housing 14 are spaced apart.

[0035] Specifically, the first bearing housing 12 has a first bearing hole 121. The second bearing housing 13 has a second bearing hole 131. The third bearing housing 14 has a third bearing hole 141.

[0036] like Figure 3 and Figure 4 As shown, in some embodiments, the diameter D1 of the first bearing bore is larger than the diameter D2 of the crankshaft. The diameter of the second bearing bore is also larger than the diameter D2 of the crankshaft. This arrangement facilitates the installation of the crankshaft 2.

[0037] like Figure 2 As shown, in some embodiments, the first bearing hole 121 is a circular hole. The second bearing hole 131 is a circular hole. The third bearing hole 141 is a circular hole.

[0038] In some embodiments, the first bearing housing 12 has a first mounting hole 122. The second bearing housing 13 has a second mounting hole 132.

[0039] In some embodiments, the first mounting hole 122 is a circular hole. The second mounting hole 132 is a circular hole.

[0040] Specifically, the axis of the first mounting hole 122 is perpendicular to the axis of the first bearing hole 121. The axis of the second mounting hole 132 is perpendicular to the axis of the second bearing hole 131.

[0041] like Figure 1 , Figure 2 and Figure 5 As shown, in some embodiments, the horizontally opposed engine further includes a first bearing 3. The first bearing 3 is sleeved on and connected to the first main journal 21. The first bearing 3 is located in the first bearing bore 121. The first bearing 3 has a transition fit with the first bearing housing 12. The first bearing 3 is connected to the first bearing housing 12.

[0042] like Figure 6 As shown, in some embodiments, the first bearing 3 includes a first sub-bearing 31 and a second sub-bearing 32. The first sub-bearing 31 is detachably connected to the second sub-bearing 32. By configuring the first bearing 3 to include the first sub-bearing 31 and the second sub-bearing 32, it is convenient to fit the first bearing 3 onto the first main journal 21.

[0043] In some embodiments, the first sub-bearing 31 has a semi-circular cross-section along its axial direction. The second sub-bearing 32 also has a semi-circular cross-section along its axial direction.

[0044] like Figure 7 As shown, specifically, the first sub-bearing 31 has a first connecting hole 311. The second sub-bearing 32 has a first threaded hole 321. The first fastener 4 passes through the first connecting hole 311 and is threadedly connected to the second sub-bearing 32 through the first threaded hole 321. By providing the first connecting hole 311 on the first sub-bearing 31 and the first threaded hole 321 on the second sub-bearing 32, the first fastener 4 can conveniently and quickly connect the first sub-bearing 31 and the second sub-bearing 32, while simultaneously allowing the first bearing 3 to be sleeved on and connected to the first main journal 21.

[0045] Optionally, the first fastener 4 is a bolt.

[0046] In some embodiments, the first sub-bearing 31 has two first connecting holes 311. The two first connecting holes 311 are symmetrically distributed about the centerline of the first sub-bearing 31. The second sub-bearing 32 has two first threaded holes 321. The first connecting holes 311 and the first threaded holes 321 are provided in a one-to-one correspondence. Correspondingly, two first fasteners 4 are also provided. The first fasteners 4 are provided in a one-to-one correspondence with the first connecting holes 311. By providing two first connecting holes 311 on the first sub-bearing 31 and two first threaded holes 321 on the second sub-bearing 32, the connection between the first sub-bearing 31 and the second sub-bearing 32 is made more secure, while avoiding excessive vibration of the first bearing 3 during use and improving the service life of the first bearing 3.

[0047] like Figure 6 and Figure 7 As shown, in some embodiments, one of the first sub-bearing 31 and the second sub-bearing 32 has a second threaded hole 312. The second fastener 5 passes through the first mounting hole 122 and is threadedly connected to one of the first sub-bearing 31 and the second sub-bearing 32 through the second threaded hole 312.

[0048] Specifically, the first sub-bearing 31 has a second threaded hole 312.

[0049] Optionally, the second fastener 5 is a bolt.

[0050] like Figure 1 , Figure 2 and Figure 5 As shown, in some embodiments, the horizontally opposed engine further includes a second bearing 6. The second bearing 6 is sleeved on and connected to the second main journal 24. The second bearing 6 is located in the second bearing bore 131. The second bearing 6 has a transition fit with the second bearing bore 131. The second bearing 6 is connected to the second bearing housing 13.

[0051] like Figure 7 As shown, specifically, the second bearing 6 includes a third sub-bearing 61 and a fourth sub-bearing 62. The third sub-bearing 61 and the fourth sub-bearing 62 are connected. By configuring the second bearing 6 to include the third sub-bearing 61 and the fourth sub-bearing 62, it is convenient to fit the second bearing 6 onto the second main journal 24.

[0052] like Figure 8As shown, in some embodiments, the third sub-bearing 61 has a second connecting hole 611. The fourth sub-bearing 62 has a third threaded hole 621. The third fastener 7 passes through the second connecting hole 611 and is threadedly connected to the fourth sub-bearing 62 through the third threaded hole 621. By providing the second connecting hole 611 on the third sub-bearing 61 and the third threaded hole 621 on the fourth sub-bearing 62, the third fastener 7 can conveniently and quickly connect the third sub-bearing 61 and the fourth sub-bearing 62, while simultaneously allowing the second bearing 6 to be sleeved on and connected to the second main journal 24.

[0053] Optionally, the third fastener 7 is a bolt.

[0054] In some embodiments, the third sub-bearing 61 has two second connecting holes 611, which are symmetrically distributed about the centerline of the third sub-bearing 61. The fourth sub-bearing 62 has two third threaded holes 621, with each of the second connecting holes 611 corresponding to one of the third threaded holes 621. Correspondingly, two third fasteners 7 are also provided, each corresponding to one of the second connecting holes 611. By providing two second connecting holes 611 on the third sub-bearing 61 and two third threaded holes 621 on the fourth sub-bearing 62, the connection between the third sub-bearing 61 and the fourth sub-bearing 62 is made more secure, while avoiding excessive vibration of the second bearing 6 during use and improving the service life of the second bearing 6.

[0055] like Figure 5 and Figure 8 As shown, in some embodiments, one of the third sub-bearing 61 and the fourth sub-bearing 62 has a fourth threaded hole 612, and the fourth fastener 8 passes through the second mounting hole 132 and is threadedly connected to one of the third sub-bearing 61 and the fourth sub-bearing 62 through the fourth threaded hole 612. By providing the second mounting hole 132 on the body 1 and the fourth threaded hole 612 on one of the third sub-bearing 61 and the fourth sub-bearing 62, the connection and fixation between the second bearing 6 and the body 1 is achieved by using the fourth fastener 8. The structure is simple and the operation is convenient.

[0056] Specifically, the third sub-bearing 61 has a fourth threaded hole 612.

[0057] Optionally, the fourth fastener 8 is a bolt.

[0058] In some embodiments, the third spindle journal 29 is located in the third bearing bore 141.

[0059] The first sub-bearing 31 and the second sub-bearing 32 are connected using the first fastener 4, and the first bearing 3 is connected to the first main journal 21. This ensures that the first main journal 21 can rotate relative to the first bearing 3. The third sub-bearing 61 and the fourth sub-bearing 62 are connected using the third fastener 7, and the second bearing 6 is connected to the second main journal 24. This ensures that the second main journal 24 can rotate relative to the second bearing 6. The first bearing 3 is placed in the first bearing hole 121, and the second bearing 6 is placed in the second bearing hole 131. The first bearing 3 is connected and fixed to the first bearing housing 12 using the second fastener 5. The second bearing 6 is connected to the second bearing housing 13 using the fourth fastener 8. This prevents the first bearing 3 from moving axially. This also prevents the second bearing 6 from moving axially.

[0060] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this utility model, 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 part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, 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.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A horizontally opposed engine, characterized in that, include: The body (1) has a first bearing hole (121); A crankshaft (2) rotatably connected to the machine body (1), the crankshaft (2) comprising: The first main journal (21) is located in the first bearing hole (121); A first crank arm (22) is connected to a first main journal (21); and A first connecting rod journal (23) is connected to the first crank arm (22), and the first connecting rod journal (23) and the first main journal (21) are radially interleaved along the crankshaft (2); and The first bearing (3) is sleeved on the first main journal (21) and connected to the first main journal (21). The first bearing (3) is connected to the machine body (1). The first bearing (3) is transitionally fitted with the first bearing hole (121). The body (1) is an integral structure, and the diameter (D2) of the crankshaft is smaller than the diameter (D1) of the first bearing hole.

2. The horizontally opposed engine according to claim 1, characterized in that, The first bearing (3) includes: First sub-bearing (31); and The second sub-bearing (32) is detachably connected to the first sub-bearing (31).

3. The horizontally opposed engine according to claim 2, characterized in that, It also includes a first fastener (4), the first sub-bearing (31) having a first connecting hole (311), the second sub-bearing (32) having a first threaded hole (321), the first fastener (4) passing through the first connecting hole (311) and being threadedly connected to the second sub-bearing (32) through the first threaded hole (321).

4. The horizontally opposed engine according to claim 3, characterized in that, The first sub-bearing (31) has two first connecting holes (311), which are symmetrically distributed about the centerline of the first sub-bearing (31). The second sub-bearing (32) has two first threaded holes (321), and the first connecting holes (311) and the first threaded holes (321) are arranged in a one-to-one correspondence.

5. The horizontally opposed engine according to claim 2, characterized in that, It also includes a second fastener (5), the body (1) has a first mounting hole (122), one of the first sub-bearing (31) and the second sub-bearing (32) has a second threaded hole (312), the second fastener (5) passes through the first mounting hole (122) and is threadedly connected to one of the first sub-bearing (31) and the second sub-bearing (32) through the second threaded hole (312).

6. The horizontally opposed engine according to claim 1, characterized in that, It also includes a second bearing (6), the body (1) has a second bearing hole (131), the second bearing (6) is transitionally fitted with the second bearing hole (131), the second bearing (6) is connected to the body (1), the crankshaft (2) includes a second main journal (24), the second main journal (24) and the first main journal (21) are spaced apart along the axial direction of the crankshaft (2), the second main journal (24) and the first main journal (23) are coaxial, the second bearing (6) is sleeved on the second main journal (24) and connected to the second main journal (24), the diameter (D2) of the crankshaft is smaller than the diameter of the second bearing hole.

7. The horizontally opposed engine according to claim 6, characterized in that, The second bearing (6) includes: The third sub-bearing (61); and A fourth sub-bearing (62) is detachably connected to the third sub-bearing (61).

8. The horizontally opposed engine according to claim 7, characterized in that, It also includes a third fastener (7), the third sub-bearing (61) having a second connecting hole (611), the fourth sub-bearing (62) having a third threaded hole (621), the third fastener (7) passing through the second connecting hole (611) and being threadedly connected to the fourth sub-bearing (62) through the third threaded hole (621).

9. The horizontally opposed engine according to claim 8, characterized in that, The third sub-bearing (61) has two second connecting holes (611), which are symmetrically distributed about the centerline of the third sub-bearing (61). The fourth sub-bearing (62) has two third threaded holes (621), and the second connecting holes (611) and the third threaded holes (621) are arranged in a one-to-one correspondence.

10. The horizontally opposed engine according to claim 7, characterized in that, It also includes a fourth fastener (8), the body (1) has a second mounting hole (132), one of the third sub-bearing (61) and the fourth sub-bearing (62) has a fourth threaded hole (612), the fourth fastener (8) passes through the second mounting hole (132) and is threadedly connected to one of the third sub-bearing (61) and the fourth sub-bearing (62) through the fourth threaded hole (612).

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