Method of assembling a piston connecting rod

Abstract

The application discloses a piston connecting rod assembly method, and the piston connecting rod is suitable for a multi-cylinder engine, the multi-cylinder engine comprises a crankshaft, a first cylinder body and a second cylinder body, the piston connecting rod comprises a first piston connecting rod assembly and a second piston connecting rod assembly, and the assembly method comprises the following steps: connecting the first piston connecting rod assembly with the crankshaft and mounting the first piston connecting rod assembly and the crankshaft on the first cylinder body, and arranging the first piston connecting rod assembly in a vertical direction; arranging the second piston connecting rod assembly in the vertical direction and connecting the second piston connecting rod assembly with the crankshaft; positioning high-position pistons and low-position pistons of the second piston connecting rod assembly in the vertical direction respectively; loading the second cylinder body into the high-position pistons and the low-position pistons in the vertical direction downwards; and fixing the second cylinder body with the first cylinder body. According to the piston connecting rod assembly method, the installation mode of the second piston connecting rod assembly is changed, the second piston connecting rod assembly is kept in a vertical fixed state without shaking during the installation process, and therefore the problem of assembly difficulty caused by complex structure and other factors is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a method for assembling a piston connecting rod. Background Technology

[0002] Currently, most internal combustion engines on the market are inline four-cylinder engines, while horizontally opposed six-cylinder and eight-cylinder engines are still relatively rare. However, the horizontally opposed design lowers the car's center of gravity and allows for a lower, flatter front end, reducing wind resistance and enhancing driving stability. Furthermore, the horizontally opposed cylinder layout is a symmetrical and stable structure, resulting in smoother engine operation and minimal power loss compared to inline and V-type engines. However, the complex design of existing horizontally opposed engines leads to complex assembly processes and challenges in ensuring manufacturing quality, thus leaving room for improvement. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a piston connecting rod assembly method to solve the problem of difficult assembly processes in horizontally opposed engines.

[0004] According to an embodiment of the present invention, a piston connecting rod assembly method is provided. The piston connecting rod is applicable to a multi-cylinder engine, the multi-cylinder engine including a crankshaft, a first cylinder block, and a second cylinder block. The piston connecting rod includes a first piston connecting rod assembly and a second piston connecting rod assembly. The assembly method includes: connecting the first piston connecting rod assembly and the crankshaft together and mounting them on the first cylinder block, with the first piston connecting rod assembly arranged vertically; arranging the second piston connecting rod assembly vertically and connecting it to the crankshaft; positioning the high-position piston and the low-position piston of the second piston connecting rod assembly vertically respectively; installing the second cylinder block vertically downwards and sequentially assembling it with the high-position piston and the low-position piston; and fixing the second cylinder block to the first cylinder block.

[0005] According to the piston connecting rod assembly method of the present invention, by changing the installation method of the second piston connecting rod assembly, the second piston connecting rod assembly is vertically positioned on the crankshaft, and then the second cylinder is vertically installed, so that the second cylinder is sequentially sleeved and connected to the high-position piston and low-position piston of the second piston connecting rod assembly, and finally fixedly connected to the first cylinder. This ensures that the second piston connecting rod assembly remains vertically fixed and without shaking during the installation process, thereby effectively solving the assembly difficulties caused by factors such as small cylinder space and complex structure.

[0006] According to the piston connecting rod assembly method of the present invention, the high-position piston and the low-position piston of the second piston connecting rod assembly are respectively positioned vertically; a positioning pad is supported below the low-position piston to keep the low-position piston in a vertical position; a positioning block is supported below the high-position piston to keep the high-position piston in a vertical position.

[0007] According to the piston connecting rod assembly method of the present invention, the positioning block provided below the high-position piston includes: installing the positioning block above the positioning pad, so that the lower end of the positioning block supports the positioning pad and the upper end supports the high-position piston.

[0008] According to an embodiment of the present invention, the method for assembling a piston connecting rod, wherein a positioning pad is provided below the lower piston, includes: moving a plurality of lower pistons of the second piston connecting rod assembly to the same height; and supporting the positioning pad on the bottom of the plurality of lower pistons so that the plurality of lower pistons extend vertically.

[0009] According to an embodiment of the present invention, the method for assembling a piston connecting rod, wherein the positioning block is provided below the high-position piston, includes: moving a plurality of high-position pistons of the second piston connecting rod assembly to the same height; and supporting the positioning block on the bottom of the plurality of high-position pistons so that the plurality of high-position pistons extend vertically.

[0010] According to an embodiment of the present invention, the assembly method for a piston connecting rod further includes: after assembling the positioning pad and the positioning block, providing a ring-collecting fixture on the outer sleeve of the high-position piston and the low-position piston; and after the high-position piston and the low-position piston are respectively assembled with the second cylinder body, disassembling the ring-collecting fixture.

[0011] According to the piston connecting rod assembly method of the present invention, the step of vertically and downwardly inserting the second cylinder body into sequential assembly with the high-position piston and the low-position piston includes: placing a high-position pad on the first cylinder body; pressing the second cylinder body toward the first cylinder body; removing the positioning block; and assembling the second cylinder body with the high-position piston.

[0012] According to the piston connecting rod assembly method of the present invention, the step of vertically inserting the second cylinder body downwards and assembling it sequentially with the high-position piston and the low-position piston further includes: replacing the high-position pad with the low-position pad; pressing the second cylinder body toward the first cylinder body; removing the positioning pad; and assembling the second cylinder body with the low-position piston.

[0013] According to the piston connecting rod assembly method of the present invention, the step of replacing the high-position pad with the low-position pad includes: removing a plurality of the high-position pads from the second cylinder body; and placing the low-position pads at a plurality of positions where the high-position pads were removed.

[0014] According to an embodiment of the present invention, the assembly method of the piston connecting rod further includes: before vertically positioning the high-position piston and the low-position piston of the second piston connecting rod assembly, rotating the crankshaft and moving the high-position piston to the highest stroke position and the low-position piston to the lowest stroke position.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the structure of a horizontally opposed engine according to an embodiment of the present invention;

[0018] Figure 2 This is an installation effect diagram of the second piston connecting rod assembly, positioning pad, and positioning block according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the high-position pad installed behind the engine according to an embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of an engine according to an embodiment of the present invention;

[0021] Figure 5 yes Figure 4 Enlarged view of point a in the middle;

[0022] Figure 6 This is an exploded view of the engine structure when the high-position piston is installed according to an embodiment of the present invention;

[0023] Figure 7 This is an exploded view of the engine structure when the low-position piston is installed according to an embodiment of the present invention;

[0024] Figure 8 This is a general flowchart of the assembly method of the piston connecting rod according to an embodiment of the present invention;

[0025] Figure 9 This is a flowchart illustrating the assembly method according to an embodiment of the present invention regarding the connection between the second piston connecting rod assembly and the crankshaft;

[0026] Figure 10 This is a flowchart illustrating the assembly method according to an embodiment of the present invention regarding the fixing of the high-position piston and the low-position piston;

[0027] Figure 11 This is a flowchart illustrating the assembly method according to an embodiment of the present invention regarding the connection between the second piston connecting rod assembly and the second cylinder block;

[0028] Figure 12 This is a flowchart illustrating the assembly method according to an embodiment of the present invention regarding the connection of the first cylinder block and the second cylinder block.

[0029] Figure label:

[0030] Engine 100,

[0031] First cylinder block 1, second cylinder block 2, crankshaft 3.

[0032] Piston connecting rod 4, first piston connecting rod assembly 41, second piston connecting rod assembly 42, high-position piston 421, low-position piston 422, positioning pad 5, positioning block 6, ring-receiving fixture 7, left ring-receiving fixture piece 71, right ring-receiving fixture piece 72.

[0033] First chamfer structure A, second chamfer structure B, arc-shaped bevel structure C, high-position pad 8, low-position pad 9.

[0034] Piston assembly tooling 200. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The cylinders of the horizontally opposed engine 100 are positioned horizontally, with the piston and connecting rod 4 assemblies placed symmetrically on both sides of the crankshaft 3. This helps lower the car's center of gravity and results in a flatter, lower front end, thus reducing wind resistance and enhancing driving stability. Furthermore, the stable, symmetrical cylinder layout ensures that the engine 100 operates more smoothly than either the inline engine 100 or the V-type engine 100, while also minimizing power loss during operation.

[0037] The piston assembly process of the horizontally opposed engine 100 is relatively complicated and the assembly technology is difficult. Therefore, this embodiment of the invention proposes an assembly method for the piston connecting rod 4 to solve the above problems.

[0038] The following is for reference. Figure 1-12This invention describes a method for assembling a piston connecting rod 4 according to an embodiment of the present invention. The piston connecting rod 4 is suitable for a multi-cylinder engine 100, which includes a crankshaft 3, a first cylinder block 1, and a second cylinder block 2. The piston connecting rod 4 includes a first piston connecting rod assembly 41 and a second piston connecting rod assembly 42. It is understood that, as Figure 1 As shown, the multi-cylinder engine 100 in this embodiment is applicable to six-cylinder and eight-cylinder engines 100, etc. That is, the assembly method of this embodiment is applicable to horizontally opposed engines 100 with an even number of cylinders, and is an assembly method adapted to the structure of horizontally opposed engines 100. Furthermore, in practical applications, the piston connecting rod 4 assembly method of this invention can be applied to passenger cars, SUVs, and motorcycles, thus having a wider range of applications.

[0039] The first piston connecting rod assembly 41 and the second piston connecting rod assembly 42 both include a high-position piston 421 and a low-position piston 422. The high-position piston 421 and the low-position piston 422 have the same structure. When the high-position piston 421 and the low-position piston 422 are installed on the crankshaft 3, the high-position piston 421 and the low-position piston 422 have a height difference in the height direction, that is, the high-position piston 421 is higher than the low-position piston 422.

[0040] Specifically, such as Figure 8 As shown, the assembly method includes:

[0041] S1: Connect the first piston connecting rod assembly 41 and the crankshaft 3 and install them together on the first cylinder block 1, and arrange the first piston connecting rod assembly 41 vertically;

[0042] In other words, the first piston connecting rod assembly 41 is installed on the first cylinder 1 from the outside of the first cylinder 1 through the piston assembly fixture 200, and then the first piston connecting rod assembly 41 is pushed out of the cylinder chamber, so that the big end of the connecting rod of the first piston connecting rod assembly 41 is fixed to the crankshaft 3, and the crankshaft 3 is fixed to the first cylinder 1. Thus, the installation of the first piston connecting rod assembly 41 can be realized.

[0043] Then, the first cylinder block 1 is vertically positioned so that the first piston connecting rod assembly 41 and the crankshaft 3 are vertically connected.

[0044] S2: The second piston connecting rod assembly 42 is arranged vertically and connected to the crankshaft 3;

[0045] In other words, such as Figure 2 As shown, the second piston connecting rod assembly 42 is fixedly connected to the crankshaft 3, and the second piston connecting rod assembly 42 is oscillated so that the second piston connecting rod assembly 42 is vertically connected to the crankshaft 3, and can be kept on the same horizontal line as the first piston connecting rod assembly 41. This facilitates the connection of the second piston connecting rod assembly 42 to the second cylinder block 2.

[0046] S3: Position the high-position piston 421 and the low-position piston 422 of the second piston connecting rod assembly 42 vertically, respectively;

[0047] In other words, such as Figure 2 As shown, when the high-position piston 421 and the low-position piston 422 are both standing on the same horizontal plane, all the low-position pistons 422 on the second piston connecting rod assembly 42 are fixed, and then all the high-position pistons 421 are positioned so that the high-position pistons 421 and the low-position pistons 422 are kept in a fixed position, preventing the high-position pistons 421 and the low-position pistons 422 from wobbling left and right, ensuring the stability of the installation process, and facilitating the installation of the second cylinder 2.

[0048] S4: Install the second cylinder 2 vertically downwards and assemble it with the high piston 421 and the low piston 422 in sequence;

[0049] In other words, such as Figure 3 As shown, after fixing the high-position piston 421 and low-position piston 422 on the second piston connecting rod assembly 42, the second cylinder block 2 is installed facing the crankshaft 3, so that the second cylinder block 2 is vertically downward and installed with the second piston connecting rod assembly 42. That is, the piston of the second piston connecting rod assembly 42 is sleeved and connected to the cylinder chamber of the second cylinder block 2, so that the high-position piston 421 and low-position piston 422 are connected to the second cylinder block 2. Thus, the installation of the second piston connecting rod assembly 42 is achieved.

[0050] S5: Fix the second cylinder 2 to the first cylinder 1.

[0051] In other words, such as Figure 7 As shown, after the second piston connecting rod assembly 42 is installed on the second cylinder 2, the second cylinder 2 is pressed into the first cylinder 1, and then fixed with bolts or other structures, thereby completing the entire piston connecting rod 4 installation process.

[0052] According to the assembly method of the piston connecting rod 4 of the present invention, by changing the installation method of the second piston connecting rod assembly 42, the second piston connecting rod assembly 42 is vertically fixed on the crankshaft 3, and then the second cylinder 2 is vertically installed, so that the second cylinder 2 is sequentially sleeved and connected to the high-position piston 421 and the low-position piston 422 of the second piston connecting rod assembly 42, and finally fixedly connected to the first cylinder 1, ensuring that the second piston connecting rod assembly 42 remains vertically fixed without shaking during the installation process, thereby effectively solving the assembly difficulties caused by factors such as small cylinder space and complex structure.

[0053] In some embodiments, step S3 includes vertically positioning the high piston 421 and the low piston 422 of the second piston rod assembly 42;

[0054] First, a positioning pad 5 is installed below the low-position piston 422 to keep the low-position piston 422 vertically positioned.

[0055] A positioning block 6 is then installed below the high-position piston 421 to keep the high-position piston 421 in a vertical position.

[0056] It should be noted that, as Figure 2 As shown, the positioning pad 5 is constructed as a U-shaped strip plate. The length and width of the positioning pad 5 are approximately the same as the length and width of the crankshaft 3, and the width of the positioning pad 5 is smaller than that of the piston end. Furthermore, the number of positioning blocks 6 is consistent with the number of high-position pistons 421, achieving a one-to-one correspondence.

[0057] Therefore, in actual installation, the S2 and S3 processes include the following steps:

[0058] S21: The high-position piston 421 and the low-position piston 422 are spaced apart and fixedly connected to the crankshaft 3 to ensure the stable connection of the second piston connecting rod assembly 42.

[0059] S31: The positioning pad 5 is vertically attached to the crankshaft 3, and the connecting rods of the low piston 422 and the high piston 421 are sequentially inserted through the space between the two arms of the positioning pad 5. Then, the end of the low piston 422 abuts against the two arms of the positioning pad 5 to achieve the function of limiting and fixing, thereby preventing the low piston 422 from shaking.

[0060] S32: The positioning pad 5 is connected to the positioning block 6, and the positioning block 6 is used to abut against the high piston 421 to limit the movement of the high piston 421 and prevent the high piston 421 from shaking.

[0061] In some embodiments, the positioning block 6 located below the high-position piston 421 includes:

[0062] The positioning block 6 is installed above the positioning pad 5 so that its lower end supports the positioning pad 5 and its upper end supports the high-position piston 421. In other words, during actual installation, the positioning block 6 is placed on the positioning pad 5 so that its bottom abuts against the two arms of the positioning pad 5, and its top abuts against the high-position piston 421, thereby providing support to the high-position piston 421 and limiting its sway.

[0063] In some embodiments, the positioning pad 5 provided below the low-position piston 422 includes:

[0064] Move the multiple lower pistons 422 of the second piston rod assembly 42 to the same height;

[0065] The positioning pad 5 is supported on the bottom of the multiple low-position pistons 422 so that the multiple low-position pistons 422 extend vertically.

[0066] In other words, when installing the positioning pad 5, if Figure 9 and Figure 10 As shown, S21 and S31 specifically include the following steps:

[0067] S211: Move all the low-position pistons 422 to the same height and connect them vertically to the crankshaft 3;

[0068] S311: The open end of the positioning pad 5 is sequentially inserted through the connecting rod portion of all the low-position pistons 422 from the extension direction of the crankshaft 3.

[0069] S312: Fix the positioning pad 5 to the end face of the crankshaft 3 and keep it horizontal;

[0070] S313: Position the lower piston 422 so that one end facing the crankshaft 3 is against the two arms of the positioning pad 5.

[0071] Therefore, all the lower pistons 422 are supported by the positioning pads 5, and are kept on the same horizontal plane, with the same height and spaced apart from each other, thus meeting the conditions for installing the second cylinder 2.

[0072] In some embodiments, the positioning block 6 below the high-position piston 421 includes:

[0073] The multiple high-position pistons 421 of the second piston connecting rod assembly 42 are moved to the same height;

[0074] The positioning block 6 is supported at the bottom of the multiple high-position pistons 421 so that the multiple high-position pistons 421 extend vertically.

[0075] In other words, when installing positioning block 6, such as Figure 9 and Figure 10 As shown, S21 and S32 specifically include the following steps:

[0076] S212: Move all the high-position pistons 421 to the same height and connect them vertically to the crankshaft 3;

[0077] S321: The opening end of the positioning pad 5 is sequentially inserted through the connecting rod portion of all the high-position pistons 421 from the extension direction of the crankshaft 3.

[0078] S322: Fix the positioning pad 5 to the end face of the crankshaft 3 and keep it horizontal;

[0079] S323: Place multiple positioning blocks 6 on the two arms of the positioning pad 5, with the end of each positioning block 6 facing away from the positioning pad 5 abutting against the end of a high-position piston 421.

[0080] It should be noted that in actual installation, steps S211 and S212 are performed simultaneously, steps S311 and S321 are performed simultaneously, and steps S312 and S322 are the same. This embodiment describes the assembly of different pistons differently, but it does not affect the installation of each piston.

[0081] In some embodiments, the assembly method further includes:

[0082] After assembling the positioning pad 5 and the positioning block 6, a retaining ring fixture 7 is installed on the outer sleeve of the high piston 421 and the low piston 422.

[0083] After the high-position piston 421 and the low-position piston 422 are respectively assembled with the second cylinder 2, the ring-retracting fixture 7 is disassembled.

[0084] It should be noted that, as Figure 2 and Figure 6 As shown, the piston ring retainer 7 includes a left retaining ring retainer piece 71 and a right retaining ring retainer piece 72. The left retaining ring retainer piece 71 and the right retaining ring retainer piece 72 are the same size and structure. The piston ring retainer 7 is formed by connecting the left retaining ring retainer piece 71 and the right retaining ring retainer piece 72 end to end. At the same time, the size of the piston ring retainer 7 is the same as the size of the piston ring. Therefore, in actual installation, the piston ring retainer 7 can be fitted onto the outer surface of the high-position piston 421 and the low-position piston 422, thereby serving to retain the piston ring and ensuring that the piston can be disassembled into two halves after being installed in the cylinder block and removed from the lower end of the engine 100.

[0085] Among them, such as Figure 4 and Figure 5 As shown, a first chamfer structure A is provided at the upper end of the left receiving ring tooling piece 71 and the right receiving ring tooling piece 72, and a second chamfer structure B is provided at the lower end of each cylinder bore of the second cylinder body 2. The chamfer angle α of the first chamfer structure A and the second chamfer structure B both satisfy: 30° < α < 60°. At the same time, the right angle sides of the first chamfer structure A and the second chamfer structure B are both greater than 3mm.

[0086] It is understandable that by designing the first chamfer structure A and the second chamfer structure B, the angle values ​​of the first chamfer structure A and the second chamfer structure B in the second cylinder 2 are the same. This facilitates the smooth guidance of the second piston connecting rod assembly 42 into the second cylinder 2 through the cooperation of the first chamfer structure A and the second chamfer structure B. At this time, the second piston connecting rod assembly 42 and the cylinder bore of the second cylinder 2 are concentrically set, thereby playing a guiding and precise positioning role.

[0087] And, such as Figure 5As shown, each left retaining ring tooling piece 71 and right retaining ring tooling piece 72 has an arc-shaped inclined surface structure C at the end away from the chamfer, and ensures that the maximum diameter is greater than the diameter of the piston ring in the free state, so as to make it easier to retract the piston ring during installation.

[0088] Therefore, in actual installation, the steps for installing the ring-retracting fixture 7 are included in S3, as follows:

[0089] S33: Install a ring-retracting fixture 7 on each high-position piston 421 and low-position piston 422.

[0090] In some embodiments, the process of vertically and downwardly inserting the second cylinder 2 into sequential assembly with the high-position piston 421 and the low-position piston 422 includes:

[0091] A high-position pad 8 is placed on the first cylinder block 1;

[0092] Press the second cylinder 2 toward the first cylinder 1;

[0093] Remove positioning block 6;

[0094] Assemble the second cylinder 2 with the high-position piston 421.

[0095] It should be noted that, as Figure 6 As shown, there are four high-position pads 8, and each high-position pad 8 is constructed as a rectangular block. The high-position pads 8 have stable strength and can stably support the weight of the second cylinder 2.

[0096] Therefore, in actual installation, such as Figure 11 As shown, the process of fixing the high-position piston 421 in step S4 includes the following:

[0097] S411: Place four high-position pads 8 at the mating surfaces of the first cylinder 1 and the second cylinder 2 respectively;

[0098] S412: The cylinder port of the second cylinder 2 and the high-position piston 421 are vertically aligned and the distance between them is maintained at 5-10mm.

[0099] S413: Press the second cylinder 2 to make the high-position piston 421 enter the second cylinder 2. Then the second cylinder 2 abuts against the high-position pad 8. At this time, ensure that the distance between the lower end of the cylinder port of the second cylinder 2 and the low-position piston 422 is kept at about 10mm.

[0100] S414: First, remove the positioning block 6 from the second cylinder 2, then open the left and right ring-retracting tooling pieces 72 on the high-position piston 421 and take them out from both sides of the second cylinder 2 respectively.

[0101] In step S414, it is necessary to ensure that the disassembly of the ring-receiving tool 7 and the positioning block 6 does not come into contact with the low-position piston 422, so as to avoid affecting the assembly of the low-position piston 422.

[0102] In some embodiments, the second cylinder 2 is installed vertically downwards and sequentially assembled with the high piston 421 and the low piston 422, which further includes:

[0103] Replace the high-position pad 8 with the low-position pad 9;

[0104] Press the second cylinder 2 toward the first cylinder 1;

[0105] Remove the positioning pad 5;

[0106] Assemble the second cylinder 2 with the low-position piston 422.

[0107] It should be noted that, as Figure 7 As shown, four low-position pads 9 are provided, and each low-position pad 9 is constructed as a rectangular block. The height of the low-position pads 9 is lower than that of the high-position pads 8. This ensures the strength of the low-position pads 9 so that they can stably support the weight of the second cylinder 2.

[0108] Therefore, in actual installation, such as Figure 11 As shown, the process of fixing the low-position piston 422 in step S4 includes the following:

[0109] S421: Replace the four high-position pads 8 with four low-position pads 9, and ensure that the replaced low-position pads 9 are positioned at the mating surface of the first cylinder 1 and the second cylinder 2.

[0110] S422: The cylinder port of the second cylinder 2 and the low-position piston 422 are vertically aligned and the distance between them is maintained at 5-10mm.

[0111] S423: Press the second cylinder 2 to make the lower piston 422 enter the second cylinder 2 until the second cylinder 2 abuts against the lower pad 9.

[0112] S424: First, remove the positioning pad 5 from the second cylinder 2, then open the left and right retracting ring tooling pieces 71 and 72 on the low piston 422 and take them out from both sides of the second cylinder 2 respectively.

[0113] In some embodiments, replacing the high-position pad 8 with the low-position pad 9 includes:

[0114] Remove multiple high-position pads 8 from the second cylinder block 2;

[0115] Furthermore, low-position pads 9 were placed at multiple locations where the high-position pad 8 was removed.

[0116] In other words, step S421 also includes the following specific steps:

[0117] S4211: Fix the second cylinder 2 vertically to ensure that the second cylinder 2 is horizontal and does not wobble;

[0118] S4212: Remove multiple high-position pistons 421 from the mating surface between the first cylinder 1 and the second cylinder 2, and then insert low-position pistons 422, ensuring that the height of the multiple low-position pistons 422 is consistent in the vertical direction.

[0119] In some embodiments, the assembly method further includes:

[0120] Before the high-position piston 421 and low-position piston 422 of the second piston connecting rod assembly 42 are positioned vertically, the crankshaft 3 is rotated so that the high-position piston 421 moves to the highest position of the stroke and the low-position piston 422 moves to the lowest position of the stroke.

[0121] In other words, S1 specifically includes the following:

[0122] S11: The first piston connecting rod assembly 41 is connected to the crankshaft 3 and the first cylinder block 1;

[0123] S12: Rotate crankshaft 3 so that the connecting rod journal of crankshaft 3 remains horizontal relative to the first cylinder block 1;

[0124] It is understandable that, as shown in S12, when the second piston connecting rod assembly 42 is connected to the crankshaft 3 journal, the second piston connecting rod assembly 42 forms a high-position piston 421 and a low-position piston 422 relative to the crankshaft 3. Among them, the high-position piston 421 of the first piston connecting rod assembly 41 is located at the highest point in the cylinder chamber, and the low-position piston 422 is located at the lowest point in the cylinder chamber.

[0125] Therefore, by rotating the crankshaft 3, the journal of the crankshaft 3 can be kept in the same vertical position, which facilitates the vertical installation of the second piston connecting rod assembly 42.

[0126] In some embodiments, the assembly method further includes:

[0127] Remove the low-position pad 9;

[0128] Fix the second cylinder 2 to the first cylinder 1.

[0129] In other words, step S5 immediately follows step S424 to fix the second cylinder 2 to the first cylinder 1, such as... Figure 12 As shown, step S5 specifically includes the following steps:

[0130] S51: Apply glue into the glue grooves provided in the first cylinder 1 and the second cylinder 2;

[0131] S52: Keep the second cylinder 2 fixed, and then remove all the low-position pads 9;

[0132] S53: Move the second cylinder 2 toward the first cylinder 1 so that the second cylinder 2 and the first cylinder 1 are in close contact and connected, and then tighten the bolts to apply the tightening torque.

[0133] Therefore, it can be understood that the assembly method of the piston connecting rod 4 in this embodiment of the invention, by utilizing a vertical assembly method, avoids the structural influence of the first cylinder block 1 and the second cylinder block 2, effectively meeting the requirements for adhesive sealing. Simultaneously, the use of the spacer allows the piston connecting rod 4 assembly to be assembled from the lower end of the cylinder block, thereby efficiently solving the process assembly requirements of the complex split cylinder block of a multi-cylinder engine 100 and resolving the problem of difficult structural assembly.

[0134] 1. In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention 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 invention.

[0135] 2. In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0136] 3. In the description of this invention, "a plurality of" means two or more.

[0137] 4. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0138] 5. In the description of the present invention, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0139] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. 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 any suitable manner in one or more embodiments or examples.

[0140] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method of assembling a piston connecting rod, characterized by, The piston connecting rod is suitable for a multi-cylinder engine, the multi-cylinder engine comprising a crankshaft, a first cylinder block and a second cylinder block, the piston connecting rod comprising a first piston connecting rod assembly and a second piston connecting rod assembly, the assembling method comprising: connecting the first piston connecting rod assembly and the crankshaft and mounting them on the first cylinder block together, and arranging the first piston connecting rod assembly in a vertical direction; arranging the second piston connecting rod assembly in a vertical direction and connecting it with the crankshaft; positioning high-position pistons and low-position pistons of the second piston connecting rod assembly in a vertical direction respectively; mounting the second cylinder block in a vertical direction downward and sequentially assembling it with the high-position pistons and the low-position pistons; fixing the second cylinder block with the first cylinder block; the high-position pistons and the low-position pistons of the second piston connecting rod assembly are positioned in a vertical direction respectively; supporting and arranging a positioning base plate below the low-position pistons to keep the low-position pistons positioned in a vertical direction; supporting and arranging a positioning block below the high-position pistons to keep the high-position pistons positioned in a vertical direction; the number of the positioning blocks is consistent with the number of the high-position pistons.

2. The piston connecting rod assembly method of claim 1 wherein, the positioning block below the high-position pistons comprises: mounting the positioning block above the positioning base plate so that the lower end of the positioning block is supported on the positioning base plate and the upper end of the positioning block supports the high-position pistons.

3. The piston connecting rod assembly method of claim 1 wherein, the positioning base plate supported below the low-position pistons comprises: moving multiple low-position pistons of the second piston connecting rod assembly to the same height; supporting the positioning base plate on the bottom of multiple low-position pistons so that multiple low-position pistons are all extended in a vertical direction.

4. The piston connecting rod assembly method of claim 1 wherein, the positioning block below the high-position pistons comprises: moving multiple high-position pistons of the second piston connecting rod assembly to the same height; supporting the positioning block on the bottom of multiple high-position pistons so that multiple high-position pistons are all extended in a vertical direction.

5. The piston connecting rod assembly method of claim 1 wherein, the assembling method further comprises: after the positioning base plate and the positioning block are assembled, arranging a collecting tool on the outer sleeve of the high-position pistons and the low-position pistons; after the high-position pistons and the low-position pistons are assembled with the second cylinder block respectively, disassembling the collecting tool.

6. The piston connecting rod assembly method of claim 1 wherein, the mounting of the second cylinder block in a vertical direction downward and sequentially assembling it with the high-position pistons and the low-position pistons comprises: placing high-position base blocks on the first cylinder block; pressing the second cylinder block toward the first cylinder block; removing the positioning block; assembling the second cylinder block with the high-position pistons.

7. The piston connecting rod assembly method of claim 6 wherein, the mounting of the second cylinder block in a vertical direction downward and sequentially assembling it with the high-position pistons and the low-position pistons further comprises: replacing the high-position base blocks with low-position base blocks; pressing the second cylinder block toward the first cylinder block; removing the positioning base plate; assembling the second cylinder block with the low-position pistons.

8. The piston connecting rod assembly method of claim 7 wherein, the replacing of the high-position base blocks with low-position base blocks comprises: removing multiple high-position base blocks from the second cylinder block; and placing the low-position base blocks at multiple positions where the high-position base blocks are removed.

9. The piston connecting rod assembly method of claim 1 wherein, the assembling method further comprises: Before the high and low pistons of the second piston link assembly are respectively positioned in the vertical direction, the crankshaft is rotated and the high piston is moved to the highest position of the stroke and the low piston is moved to the lowest position of the stroke.

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