A hot-chamber mechanism for an engine block and crankshaft

Abstract

The utility model provides a kind of hot mounting mechanism of engine box and crankshaft, which comprises rack, heating mechanism, sliding table and drawdown mechanism;The heating mechanism is arranged at one end of the rack;The drawdown mechanism is arranged at the other end of the rack;The rack is provided with guide rail and sliding drive unit;The sliding table is arranged on the guide rail, and under the drive of the sliding drive unit, the sliding table can slide along the guide rail;The engine box is arranged on the sliding table;In this way, through the synergistic effect of the heating mechanism and the drawdown mechanism, heating and assembly integration operation between the engine box and the crankshaft is realized, manual intervention is reduced, and assembly efficiency is improved;The heating mechanism only heats the box around the crankshaft mounting hole, greatly shortens the heating time of the engine box, and can ensure uniform expansion of the crankshaft mounting hole, avoiding poor assembly caused by local overheating or insufficient heating;The drawdown mechanism can ensure accurate installation of the crankshaft, improve the installation precision of the crankshaft and the box, and avoid assembly quality problems.

Description

Technical Field

[0001] This application relates to the field of engine housing assembly technology, and in particular to a heat-fitting mechanism for an engine housing and crankshaft. Background Technology

[0002] In existing engine crankshaft assembly processes, the hot fitting method is a common technique. This involves heating the engine block to expand its inner bore, then manually inserting the crankshaft to achieve an interference fit. In practice, workers place multiple blocks in an oven for approximately 20 minutes, then remove the hot blocks and install the crankshaft. However, this method suffers from several drawbacks: the heating time is long; manual operation in the high-temperature environment poses a risk of burns; and the cooling rate of the blocks is difficult to control after batch heating, potentially leading to uneven fit clearances and affecting assembly accuracy. Utility Model Content To address the aforementioned technical problems, this application provides a heat-fitting mechanism for an engine housing and crankshaft, comprising a frame, a heating mechanism, a slide, and a pull-down mechanism. The heating mechanism is disposed at one end of the frame; the pull-down mechanism is disposed at the other end of the frame; a first guide rail assembly and a sliding drive unit are disposed on the frame; the slide is disposed on the first guide rail assembly, and under the drive of the sliding drive unit, the slide can slide along the first guide rail assembly; the engine housing is disposed on the slide; when the slide moves to the end where the heating mechanism is disposed, the heating mechanism can heat the engine housing around the crankshaft mounting hole; when the slide moves to the end where the pull-down mechanism is disposed, the crankshaft is installed into the engine housing, and the crankshaft is pulled down by the pull-down mechanism.

[0003] In some embodiments of this application, the pull-down mechanism includes a first bracket, a second bracket, a rotary drive unit, a connecting component, and a first lifting drive unit; the first bracket is disposed on the frame, and a second guide rail assembly is disposed on the first bracket; the first lifting drive unit is disposed on the first bracket; the second bracket is disposed on the second guide rail assembly, the rotary drive unit is disposed on the second bracket, and the connecting component is drively connected to the output end of the rotary drive unit.

[0004] In some embodiments of this application, a first thread is formed at the top of the connecting assembly, a second thread is formed at the lower end of the crankshaft, and the rotation drive unit is capable of driving the connecting assembly to rotate, so that the connecting assembly and the crankshaft are threadedly connected.

[0005] In some embodiments of this application, the second bracket includes a bracket body, a first locking component, and a quick-release plate; a first slot and a second slot with openings opposite each other are formed on the bracket body; the quick-release plate is inserted into the first slot and the second slot, and a U-shaped groove with the opening direction in the same direction as the insertion direction is formed on the quick-release plate; the connecting component is engaged in the U-shaped groove; the first locking component is disposed on the bracket body and is used to press the quick-release plate in the axial direction.

[0006] In some embodiments of this application, the connecting assembly includes a floating tool holder and a pull-down claw; the lower part of the pull-down claw is inserted into the floating tool holder, and the upper part is formed with a first thread.

[0007] In some embodiments of this application, the slide table includes a base plate, a top plate, a second lifting drive unit, a guide assembly, and a centering assembly; the base plate is disposed on the first guide rail assembly; the second lifting drive unit is fixedly connected to the base plate, and its extended end passes through the base plate and is fixedly connected to the lower surface of the top plate; the guide assembly includes a guide sleeve and a guide post, the guide sleeve is fixedly connected to the base plate, the guide post is sleeved in the guide sleeve, and its end is fixedly connected to the top plate; the centering assembly is fixedly connected to the top plate.

[0008] In some embodiments of this application, the centering assembly includes a centering base, a centering block, and a second locking assembly; the centering base is provided with a mounting hole for mounting the centering block; the centering block is disposed in the mounting hole, and a snap-fit ​​groove is formed on the side wall of the centering block along the circumference of the centering block; the second locking assembly is disposed on the centering base, and its end can snap into the snap-fit ​​groove.

[0009] In some embodiments of this application, the heating mechanism includes a heating bracket, a heating part, and an adjustment component disposed on the frame; the adjustment component is disposed on the heating bracket, and the heating part is disposed on the adjustment component.

[0010] In some embodiments of this application, the heating mechanism further includes a temperature sensor disposed on the heating bracket, the temperature sensor being used to detect the temperature of the crankshaft mounting hole in the housing.

[0011] In some embodiments of this application, a spare parts carrying assembly is also included, which is disposed on one side of the conveyor line and is used to carry spare parts for the connecting assembly and the centering assembly.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects: The heat-fitting mechanism for the engine housing and crankshaft of this application includes a frame, a heating mechanism, a slide table, and a pull-down mechanism; the heating mechanism is located at one end of the frame; the pull-down mechanism is located at the other end of the frame; a guide rail and a sliding drive unit are provided on the frame; the slide table is located on the guide rail, and under the drive of the sliding drive unit, the slide table can slide along the guide rail; the engine housing is located on the slide table, and when the slide table moves to the end where the heating mechanism is located, the heating mechanism can heat the engine housing around the crankshaft mounting hole; when the slide table moves to the end where the pull-down mechanism is located... During the assembly process, the crankshaft is installed into the engine block and pulled down by a pull-down mechanism. In this way, the heating and assembly of the engine block and crankshaft are integrated through the combined action of the heating and pull-down mechanisms, reducing manual intervention and improving assembly efficiency. The heating mechanism only heats the area around the crankshaft mounting holes, significantly shortening the engine block's heating time and ensuring uniform expansion of the crankshaft mounting holes, avoiding assembly defects caused by localized overheating or insufficient heating. The pull-down mechanism ensures precise crankshaft installation, improving the installation accuracy between the crankshaft and the engine block and preventing quality problems caused by improper assembly.

[0013] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0014] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the heat-fitting mechanism for the engine housing and crankshaft provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the structure of the slide provided in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of the structure of a pull-down mechanism provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the structure of a pull-down mechanism provided in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the structure of a spare parts carrier assembly provided in an exemplary embodiment of this application.

[0015] In the picture: 40. Frame; 50. Heating mechanism; 60. Slide table; 70. Pull-down mechanism; 80. Spare parts carrying assembly; 401. First guide rail assembly; 402. Sliding drive unit; 501. Heating bracket; 502. Adjustment assembly; 503. Heating part; 504. Temperature sensor; 601. Base plate; 602. Top plate; 603. Second lifting drive unit; 604. Guide assembly; 605. Centering assembly; 6051. Centering seat; 6052. Centering block; 6053. Second locking assembly; 701. First bracket; 702. Second bracket; 7021. Bracket body; 7022. First locking assembly; 7023. Quick release plate; 7024. First slot; 7025. Second slot; 703. Rotation drive unit; 704. Connecting assembly; 7041. Floating tool holder; 7042. Pull-down claw; 705. First lifting drive unit; 706. Second guide rail assembly; 801. Spare parts carrier plate; 802. Detection sensor. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0017] In existing engine crankshaft assembly processes, the hot fitting method is a common technique. This involves heating the engine block to expand its inner bore, then manually inserting the crankshaft to achieve an interference fit. In practice, workers place multiple blocks in an oven for approximately 20 minutes, then remove the hot blocks and install the crankshaft. However, this method suffers from several drawbacks: the heating time is long; manual operation in the high-temperature environment poses a risk of burns; and the cooling rate of the blocks is difficult to control after batch heating, potentially leading to uneven fit clearances and affecting assembly accuracy.

[0018] Based on this, an exemplary embodiment of this application provides a heat-fitting mechanism for an engine housing and crankshaft. The mechanism includes a frame, a heating mechanism, a slide, and a pull-down mechanism. The heating mechanism is located at one end of the frame; the pull-down mechanism is located at the other end of the frame; a guide rail and a sliding drive unit are provided on the frame; the slide is located on the guide rail and can slide along the guide rail under the drive of the sliding drive unit; the engine housing is located on the slide, and when the slide moves to the end where the heating mechanism is located, the heating mechanism can heat the engine housing around the crankshaft mounting hole; when the slide moves to the end where the pull-down mechanism is located, the engine housing is heated... The crankshaft is installed into the engine block and pulled down by a pull-down mechanism. Thus, through the combined action of the heating and pull-down mechanisms, the heating and assembly of the engine block and crankshaft are integrated, reducing manual intervention and improving assembly efficiency. The heating mechanism only heats the area around the crankshaft mounting holes, significantly shortening the engine block's heating time and ensuring uniform expansion of the crankshaft mounting holes, preventing assembly defects caused by localized overheating or insufficient heating. The pull-down mechanism ensures precise crankshaft installation, improving the installation accuracy between the crankshaft and the engine block and preventing quality problems caused by improper assembly.

[0019] An exemplary embodiment of this application provides a heat-fitting mechanism for an engine housing and a crankshaft, such as... Figure 1 As shown, the heat-fitting mechanism for the engine housing and crankshaft includes a frame 40, a heating mechanism 50, a slide 60, and a pull-down mechanism 70. The heating mechanism 50 is located at one end of the frame 40; the pull-down mechanism 70 is located at the other end of the frame 40. A first guide rail assembly 401 and a sliding drive unit 402 are mounted on the frame 40; preferably, the sliding drive unit 402 is a rodless cylinder. The slide 60 is mounted on the first guide rail assembly 401, and under the drive of the sliding drive unit 402, the slide 60 can slide along the first guide rail assembly 401. The engine housing is mounted on the slide 60. When the slide 60 moves to the end where the heating mechanism 50 is located, the heating mechanism 50 can heat the housing around the crankshaft mounting hole of the engine housing. In this way, the heating mechanism 50 only heats the housing around the crankshaft mounting hole, greatly shortening the heating time of the engine housing and ensuring uniform expansion of the crankshaft mounting hole, avoiding poor assembly due to local overheating or insufficient heating. After heating is complete, the sliding drive unit 402 drives the slide table 60 to move towards the pull-down mechanism 70. When the slide table 60 moves to the end where the pull-down mechanism 70 is located, the crankshaft is installed into the engine block, and the crankshaft is pulled down by the pull-down mechanism 70. The pull-down mechanism 70 ensures that the crankshaft is accurately installed, improving the installation accuracy between the crankshaft and the engine block and avoiding quality problems caused by improper assembly. Through the synergistic effect of the heating mechanism 50 and the pull-down mechanism 70, the heating and assembly of the engine block and crankshaft are integrated, reducing manual intervention and improving the assembly efficiency of the engine block and crankshaft.

[0020] like Figure 3 and 4 As shown, the pull-down mechanism 70 includes a first bracket 701, a second bracket 702, a rotary drive unit 703, a connecting assembly 704, and a first lifting drive unit 705. The first bracket 701 is mounted on the frame 40, and a second guide rail assembly 706 is mounted on the first bracket 701. The first lifting drive unit 705 is mounted on the first bracket 701. The second bracket 702 is mounted on the second guide rail assembly 706, and the rotary drive unit 703 is mounted on the second bracket 702. Preferably, the first lifting drive unit 705 is a cylinder.

[0021] The connecting assembly 704 is driven to the output end of the rotary drive unit 703. Preferably, the rotary drive unit 703 is a motor, and a coupling is connected to its output end. The connecting assembly is driven to the coupling. For example, a fastening assembly is provided in the radial direction of the coupling. One end of the connecting assembly 704 is inserted into the interior of the coupling. The fastening assembly is arranged in the radial direction, and its end can abut against the connecting assembly 704 to achieve a drive connection between the connecting assembly 704 and the rotary drive unit 706. The fastening assembly can be a screw. Tightening the fastening assembly can release the connecting assembly 704, enabling quick disassembly of the connecting assembly 704. A first thread is formed on the top of the connecting assembly 704, and a second thread is formed at the lower end of the crankshaft. Preferably, an internal thread is formed on the connecting assembly 704, and an external thread is formed at the lower end of the crankshaft. The rotary drive unit 703 can drive the connecting assembly 704 to rotate, causing the connecting assembly 704 and the crankshaft to be threadedly connected. After the connecting assembly 704 and the crankshaft are threaded together, the first lifting drive unit 705 can drive the second bracket 702, the rotation drive unit 703 and the connecting assembly 704 to move downward along the second guide rail assembly 706, thereby driving the crankshaft to move downward and ensuring that the crankshaft is installed in place, thus ensuring the installation accuracy between the crankshaft and the housing.

[0022] Since different housing sizes have different crankshaft mounting dimensions and crankshaft dimensions, the connecting component 704 in this application can be quickly changed to adapt to different housing and crankshaft specifications in order to accommodate various housing and crankshaft specifications. For example, the second bracket 702 includes a bracket body 7021, a first locking component 7022, and a quick-release plate 7023; the bracket body 7021 has a first slot 7024 and a second slot 7025 with openings opposite to each other; the quick-release plate 7023 is inserted into the first slot 7024 and the second slot 7025, and a U-shaped groove with the opening direction in the same direction as the insertion direction is formed on the quick-release plate 7023; the connecting component 704 is engaged in the U-shaped groove; the connecting component 704 includes a floating tool holder 7041 and a pull-down claw 7042; the lower part of the pull-down claw 7042 is inserted into the floating tool holder 7041, and the upper part has a first thread. The pull-down claw 7042 is provided with two annular bosses spaced apart. The radial dimension of the annular bosses is larger than the radial dimension of the U-shaped groove. The annular bosses can restrict the movement of the lower connecting assembly 704 in the axial direction. The first locking assembly 7022 is provided on the bracket body 7021. The quick-release plate 7023 is provided with a connecting hole. The end of the first locking assembly 7022 can be screwed into the connecting hole to connect with the quick-release plate 7023, so as to press the quick-release plate 7023 in the axial direction.

[0023] When it is necessary to replace the connecting component 704, the first locking component 7022 can be screwed on to separate the first locking component 7022 from the quick release plate 7023. Then, the quick release plate 7023 can be pulled out, and the fastening component can be screwed on to release the connecting component 704. The connecting component 704 can then be pulled out and replaced with a connecting component 704 of a different specification.

[0024] like Figure 2 As shown, the slide table 60 includes a base plate 601, a top plate 602, a second lifting drive unit 603, a guide assembly 604, and a centering assembly 605. The base plate 601 is mounted on the first guide rail assembly 401. The second lifting drive unit 603 is fixedly connected to the base plate 601, and its extended end passes through the base plate 601 and is fixedly connected to the lower surface of the top plate 602. A positioning pin is provided on the top plate 602 to position the housing. The guide assembly 604 includes a guide sleeve and a guide post. The guide sleeve is fixedly connected to the base plate 601, and the guide post is sleeved inside the guide sleeve, with its end fixedly connected to the top plate 602. Preferably, the second lifting drive unit 603 is a cylinder, and the guide assembly 604 consists of four sets, respectively located at the four corners of the top plate 602. When the second lifting drive unit 603 drives the top plate 602 to move, the guide assembly 604 can guide the lifting movement of the top plate 602. A detection switch is also installed on the base plate 601 to detect the position of the top plate.

[0025] The centering component 605 is fixed to the top plate 602 and is used to position the enclosure. The centering component 605 includes a centering base 6051, a centering block 6052, and a second locking component 6053. The centering base 6051 has mounting holes for mounting the centering block 6052. The centering block 6052 is disposed in the mounting holes, and a snap-fit ​​groove is formed on the side wall of the centering block 6052 along its circumference. The second locking component 6053 is disposed on the centering base 6051, and its end can snap into the snap-fit ​​groove. Different enclosure sizes require different sizes of centering blocks 6052; therefore, when changing the enclosure size, the centering block needs to be replaced. When replacing the centering block 6052, the second locking component 6053 can be screwed on to disengage it from the centering block 6052, so that the centering block 6052 can be removed and replaced with a centering block 6052 of a different specification.

[0026] For example, two sets of limiting components are also provided on the top surface of the top plate 602. When the gripper holds the box and places it on the slide table 60, the limiting components can limit the gripper. Stop components are also provided on the top surfaces of both ends of the frame 40. The stop components can limit the movement of the slide table 60.

[0027] like Figure 1 As shown, the heating mechanism 50 includes a heating bracket 501, a heating part 503, and an adjusting assembly 502 mounted on the frame 40. The adjusting assembly 502 is mounted on the heating bracket 501, and the heating part 503 is mounted on the adjusting assembly 502. The heating part 503 is in the form of a spiral coil and can be inserted into the crankshaft mounting hole of the housing to heat the housing around the crankshaft mounting hole. This significantly shortens the heating time of the engine housing and ensures uniform expansion of the crankshaft mounting hole, preventing poor assembly of the crankshaft and housing due to local overheating or insufficient heating. The adjusting assembly 502 includes an upper mounting plate, a lower mounting plate, an adjusting shaft, a fixing sleeve, and a locking sleeve. The upper mounting plate is mounted on the heating bracket 501, the fixing sleeve is mounted on the upper mounting plate, the adjusting shaft passes through the fixing sleeve, the locking sleeve is fitted on the adjusting shaft and located above the fixing sleeve, and the lower mounting plate is located at the lower end of the adjusting shaft. Adjusting the position of the locking sleeve on the adjusting shaft adjusts the vertical position of the heating part 503.

[0028] The heating mechanism 50 also includes a temperature sensor 504 mounted on the heating bracket 501. The temperature sensor 504 is used to detect the temperature of the crankshaft mounting hole in the housing in real time, so as to achieve quality control of the installation accuracy of the housing and crankshaft, and prevent the heating temperature from being too low, resulting in the crankshaft mounting hole being too small and the crankshaft not being installed properly, which in turn affects the assembly quality of the housing.

[0029] Preferably, the hot-fitting mechanism for the engine block and crankshaft of this application further includes a spare parts carrying assembly 80, which is disposed on one side of the conveyor line and is used to carry spare parts for the connecting assembly 704 and the centering assembly 605. Figure 5 As shown, the spare parts carrier assembly 80 includes a spare parts carrier plate 801 and a detection sensor disposed on the spare parts carrier plate 801. The spare parts carrier plate 801 is provided with a mounting base for placing a centering block 6052 and a positioning hole for a positioning connection assembly 704. Multiple positioning holes and mounting bases can be provided to support centering blocks 6052 and connection assemblies 704 of various specifications.

[0030] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the article or device that includes that element.

[0031] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0032] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A heat-fitting mechanism for an engine housing and crankshaft, characterized in that, The system includes a frame (40), a heating mechanism (50), a slide (60), and a pull-down mechanism (70); the heating mechanism (50) is located at one end of the frame (40); the pull-down mechanism (70) is located at the other end of the frame (40); a first guide rail assembly (401) and a sliding drive unit (402) are provided on the frame (40); the slide (60) is located on the first guide rail assembly (401) and is driven by the sliding drive unit (402). The slide (60) can slide along the first guide rail assembly (401); the engine housing is disposed on the slide (60); when the slide (60) moves to the end where the heating mechanism (50) is disposed, the heating mechanism (50) can heat the engine housing around the crankshaft mounting hole; when the slide (60) moves to the end where the pull-down mechanism (70) is disposed, the crankshaft is installed in the engine housing and the crankshaft is pulled down by the pull-down mechanism (70).

2. The heat-fitting mechanism for the engine housing and crankshaft according to claim 1, characterized in that, The pull-down mechanism (70) includes a first bracket (701), a second bracket (702), a rotary drive unit (703), a connecting component (704), and a first lifting drive unit (705). The first bracket (701) is mounted on the frame (40), and a second guide rail assembly (706) is mounted on the first bracket (701). The first lifting drive unit (705) is mounted on the first bracket (701). The second bracket (702) is mounted on the second guide rail assembly (706), and the rotary drive unit (703) is mounted on the second bracket (702). The connecting component (704) is connected to the output end of the rotary drive unit (703).

3. The heat-fitting mechanism for the engine housing and crankshaft according to claim 2, characterized in that, The top of the connecting assembly (704) forms a first thread, and the lower end of the crankshaft forms a second thread. The rotation drive unit (703) can drive the connecting assembly (704) to rotate, so that the connecting assembly (704) and the crankshaft are threadedly connected.

4. The heat-fitting mechanism for the engine housing and crankshaft according to claim 2, characterized in that, The second bracket (702) includes a bracket body (7021), a first locking component (7022), and a quick-release plate (7023); the bracket body (7021) has a first slot (7024) and a second slot (7025) with openings opposite to each other; the quick-release plate (7023) is inserted into the first slot (7024) and the second slot (7025), and the quick-release plate (7023) has a U-shaped groove with the opening direction in the same direction as the insertion direction; the connecting component (704) is engaged in the U-shaped groove; the first locking component (7022) is disposed on the bracket body (7021) and is used to press the quick-release plate (7023) in the axial direction.

5. The heat-fitting mechanism for the engine housing and crankshaft according to claim 2, characterized in that, The connecting assembly (704) includes a floating tool holder (7041) and a pull-down claw (7042); the lower part of the pull-down claw (7042) is inserted into the floating tool holder (7041), and the upper part is formed with a first thread.

6. The heat-fitting mechanism for the engine housing and crankshaft according to claim 1, characterized in that, The slide (60) includes a base plate (601), a top plate (602), a second lifting drive unit (603), a guide assembly (604), and a centering assembly (605); the base plate (601) is disposed on the first guide rail assembly (401); the second lifting drive unit (603) is fixedly connected to the base plate (601), and its extended end passes through the base plate (601) and is fixedly connected to the lower surface of the top plate (602); the guide assembly (604) includes a guide sleeve and a guide post, the guide sleeve is fixedly connected to the base plate (601), the guide post is sleeved in the guide sleeve, and its end is fixedly connected to the top plate (602); the centering assembly (605) is fixedly connected to the top plate (602).

7. The heat-fitting mechanism for the engine housing and crankshaft according to claim 6, characterized in that, The centering assembly (605) includes a centering base (6051), a centering block (6052), and a second locking assembly (6053); the centering base (6051) is provided with a mounting hole for mounting the centering block (6052); the centering block (6052) is disposed in the mounting hole, and a snap-fit ​​groove is formed on the side wall of the centering block (6052) along the circumference of the centering block (6052); the second locking assembly (6053) is disposed on the centering base (6051), and its end can snap into the snap-fit ​​groove.

8. The heat-fitting mechanism for the engine housing and crankshaft according to claim 1, characterized in that, The heating mechanism (50) includes a heating bracket (501), a heating part (503), and an adjustment component (502) disposed on the frame (40); the adjustment component (502) is disposed on the heating bracket (501), and the heating part (503) is disposed on the adjustment component (502).

9. The heat-fitting mechanism for the engine housing and crankshaft according to claim 8, characterized in that, The heating mechanism (50) also includes a temperature sensor (504) disposed on the heating bracket (501), the temperature sensor (504) being used to detect the temperature of the crankshaft mounting hole in the housing.

10. The heat-fitting mechanism for the engine housing and crankshaft according to claim 2, characterized in that, It also includes a spare parts carrier assembly (80), which is located on one side of the conveyor line and is used to carry spare parts for the connecting assembly (704) and the centering assembly (605).

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