Crankshaft balancing weight positioning pin bush mounting device

Abstract

The utility model relates to a crankshaft balancing weight positioning pin bush mounting device, and belongs to the field of crankshaft assembly. Comprising an axial limiting mechanism, a stepped ejector rod, a spring, a nylon guide sleeve and a fixing bolt. The axial limiting mechanism is detachably clamped on a crankshaft balancing weight mounting surface, the fixing bolt penetrates through the axial limiting mechanism and is connected with a crankshaft crank, the positioning pin sleeve, the nylon guide sleeve and the spring are arranged on the stepped ejector rod from inside to outside in a sleeving manner, and the positioning pin sleeve is connected with the nylon guide sleeve. The positioning pin sleeve, the nylon guide sleeve and the spring are sequentially arranged in the axial direction of the stepped ejector rod, the stepped ejector rod and the nylon guide sleeve detachably penetrate through the axial limiting mechanism, and the positioning pin sleeve is inserted into the positioning pin sleeve mounting hole in a matched mode. The positioning pin sleeve can be guided and positioned, and the quality problems such as deformation, inclined installation and burr generation of the positioning pin sleeve are avoided.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft assembly, and in particular to a crankshaft counterweight positioning pin sleeve installation device. Background Technology

[0002] As a core component of the engine, the crankshaft operates at high speed inside the engine. The crankshaft has extremely high requirements for its dynamic balance. Therefore, during the structural design of the crankshaft, corresponding counterweights are designed on different cranks to ensure balance, as shown in the attached diagram. Figure 5 As shown. Large forged steel crankshafts used in ships or large generator sets are often manufactured and machined separately from the counterweights due to limitations in technology and production equipment, and then assembled together. The counterweights and crankshaft body of such large crankshafts are generally fastened together with high-strength bolts after precision machining. To ensure the accuracy of the counterweight and crankshaft installation positions, locating pins are often used for positioning. These locating pins are installed with an interference fit, which places high demands on the installation process. Locating pins are generally characterized by low hardness and thin walls. Current technology typically uses a copper hammer or rubber hammer to directly drive them in. This method lacks guidance and easily leads to misalignment, causing deformation, tilting, burrs, and other quality problems. In severe cases, it can even lead to crankshaft scrapping, resulting in significant economic losses and severely impacting production efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a crankshaft counterweight positioning pin sleeve installation device to solve the above-mentioned problem.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A crankshaft counterweight positioning pin sleeve installation device includes: an axial limiting mechanism, a stepped top rod, a spring, a nylon guide sleeve, and a fixing bolt; the axial limiting mechanism is detachably clamped on the crankshaft counterweight mounting surface, the fixing bolt passes through the axial limiting mechanism and is connected to the crankshaft crank, the positioning pin sleeve, the nylon guide sleeve, and the spring are sleeved from the inside to the outside on the stepped top rod, the positioning pin sleeve, the nylon guide sleeve, and the spring are arranged sequentially along the axial direction of the stepped top rod, the stepped top rod and the nylon guide sleeve detachably pass through the axial limiting mechanism, and the positioning pin sleeve is adapted to be inserted into the positioning pin sleeve mounting hole.

[0005] The beneficial effects of this utility model are as follows: When the stepped top rod is struck with a hammer, downward pressure is generated, which drives the spring, nylon guide sleeve, and positioning pin sleeve into the mounting hole of the positioning pin sleeve. During this process, the nylon guide sleeve, together with the stepped top rod, provides guidance and positioning for the positioning pin sleeve, avoiding quality problems such as deformation, installation tilt, and burrs in the positioning pin sleeve. The axial limiting mechanism, together with the fixing bolt, helps to provide axial limiting during the installation of the positioning pin sleeve, ensuring the stability of the installation. The spring helps to lift the stepped top rod with its rebound force after the positioning pin sleeve is installed in place, making it easier to remove the stepped top rod and improving the installation efficiency of the positioning pin sleeve.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the stepped top rod includes: a handle, a spring abutment block, a first stepped post, a second stepped post, and a third stepped post; the handle, the spring abutment block, the first stepped post, the second stepped post, and the third stepped post are coaxially connected in sequence, and their diameters decrease sequentially.

[0008] The beneficial effect of adopting the above-mentioned further solution is that it facilitates the formation of a stepped shape, providing installation positions for the spring, nylon guide sleeve, and locating pin sleeve.

[0009] Furthermore, the positioning pin sleeve is fitted onto the third step post, and its top end abuts against the bottom end of the second step post. The outer wall of the positioning pin sleeve is set with the same diameter as the outer wall of the second step post.

[0010] The beneficial effect of adopting the above-mentioned further solution is that it allows the nylon guide sleeve fitted on the second step column to be fitted on the locating pin sleeve at the same time, thereby providing guidance and protection for the locating pin sleeve and preventing the thin-walled locating pin sleeve from deforming due to force.

[0011] Furthermore, the nylon guide sleeve is fitted onto the second stepped post and the positioning pin sleeve, and its top end abuts against the bottom end of the first stepped post. The outer wall of the nylon guide sleeve is set with the same diameter as the outer wall of the first stepped post.

[0012] The beneficial effect of adopting the above-mentioned further solution is that the nylon guide sleeve is made of plastic, which helps to achieve guidance and positioning while avoiding damage to the crankshaft counterweight mounting surface, thus preventing poor fit between the counterweight and the crankshaft mounting surface and affecting product quality.

[0013] Furthermore, the spring is sleeved on the first stepped post and the nylon guide sleeve, and its top end is connected to the bottom end of the spring abutment block.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the spring helps to lift the stepped top rod by using the rebound force after the positioning pin sleeve is installed in place, which facilitates the removal of the stepped top rod and improves the installation efficiency of the positioning pin sleeve.

[0015] Furthermore, the axial limiting mechanism includes an axial limiting plate, which is a plate-shaped structure with a groove at one end. The axial limiting plate is clamped on the crankshaft crank, and the end with the groove is in contact with the mounting surface of the crankshaft counterweight. The fixing bolt passes through the axial limiting plate and is connected to the crankshaft crank. The axial limiting plate is provided with a guide hole, which is a through hole coaxially arranged with the mounting hole of the positioning pin sleeve.

[0016] The beneficial effects of adopting the above-mentioned further solution are: the groove at one end of the axial limiting plate is conducive to the adaptation with the crankshaft crank, thereby fitting with the crankshaft counterweight mounting surface, which facilitates the subsequent installation of the positioning pin sleeve.

[0017] Furthermore, under the action of downward pressure, the third step column and the positioning pin sleeve pass through the guide hole, and the bottom end of the third step column and the bottom end of the positioning pin sleeve abut against the inner wall of the bottom end of the positioning pin sleeve mounting hole, and the outer wall of the positioning pin sleeve abuts against the circumferential inner wall of the positioning pin sleeve mounting hole.

[0018] The beneficial effect of adopting the above-mentioned further solution is that it facilitates the assembly of the locating pin sleeve with the locating pin sleeve mounting hole under the action of downward pressure, guided by the stepped top rod and the nylon guide sleeve.

[0019] Furthermore, under the action of downward pressure, the second stepped column and the nylon guide sleeve pass through the guide hole, the bottom end of the nylon guide sleeve abuts against the mounting surface of the crankshaft counterweight, and the outer wall of the nylon guide sleeve abuts against the inner wall of the guide hole.

[0020] The beneficial effect of adopting the above-mentioned further solution is that, through the design of the dimensions, it is beneficial to achieve the bottom end of the positioning pin sleeve abutting against the bottom inner wall of the positioning pin sleeve mounting hole when the bottom end of the nylon guide sleeve abuts against the crankshaft counterweight mounting surface, thereby achieving the positioning of the positioning pin sleeve installation.

[0021] Furthermore, under the action of downward pressure, the spring is compressed, and its bottom end abuts against the top end of the axial limiting plate.

[0022] The beneficial effect of adopting the above-mentioned further solution is that it helps to compress and store the spring force, lift the step rod, and facilitate the removal of the step rod.

[0023] Furthermore, the axial limiting mechanism also includes: multiple abutment plates, multiple studs, multiple abutment springs, and multiple nuts; the abutment plate is a plate-shaped structure disposed in the groove of the axial limiting plate; the multiple studs are vertically mounted on the multiple abutment plates one by one and pass through the side wall of the axial limiting plate; the multiple abutment springs are sleeved on the multiple studs one by one; the two ends of the abutment springs are connected to the axial limiting plate and the abutment plate one by one; the multiple nuts are threadedly connected to the multiple studs one by one; and the end of the abutment plate away from the studs abuts against the crankshaft crank.

[0024] The beneficial effect of adopting the above-mentioned further solution is that by turning the nut on the stud, it is easier to adjust the compression of the abutment spring, so that the abutment plate can abut against crankshafts and cranks of different specifications, thereby improving the applicability of this utility model. Attached Figure Description

[0025] Figure 1 A schematic diagram of the overall structure mounted on the crankshaft according to an embodiment of this utility model;

[0026] Figure 2 For along Figure 1 A schematic diagram after being cut open by the middle section line AA;

[0027] Figure 3 A schematic diagram of the axial limiting mechanism provided in this embodiment of the utility model;

[0028] Figure 4 A schematic diagram of the stepped top rod provided in an embodiment of this utility model;

[0029] Figure 5 A schematic diagram showing the counterweight block installed on the crankshaft via a locating pin sleeve, as provided in an embodiment of this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Axial limiting mechanism; 2. Stepped top rod; 3. Spring; 4. Nylon guide sleeve; 5. Locating pin sleeve; 6. Fixing bolt; 7. Crankshaft counterweight mounting surface; 8. Locating pin sleeve mounting hole; 11. Axial limiting plate; 12. Abutment plate; 13. Stud; 14. Abutment spring; 15. Nut; 16. Guide hole; 21. Handle; 22. Spring abutment block; 23. First step column; 24. Second step column; 25. Third step column. Detailed Implementation

[0032] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] like Figures 1 to 4As shown, a crankshaft counterweight positioning pin sleeve installation device includes: an axial limiting mechanism 1, a stepped push rod 2, a spring 3, a nylon guide sleeve 4, and a fixing bolt 6; the axial limiting mechanism 1 is detachably mounted on the crankshaft counterweight mounting surface 7, the fixing bolt 6 passes through the axial limiting mechanism 1 and is connected to the crankshaft crank, the positioning pin sleeve 5, the nylon guide sleeve 4, and the spring 3 are sleeved from the inside out on the stepped push rod 2, the positioning pin sleeve 5, the nylon guide sleeve 4, and the spring 3 are arranged sequentially along the axial direction of the stepped push rod 2, the stepped push rod 2 and the nylon guide sleeve 4 are detachably passed through the axial limiting mechanism 1, and the positioning pin sleeve 5 is adapted to be inserted into the positioning pin sleeve mounting hole 8.

[0034] The beneficial effects of this utility model are as follows: When the stepped top rod is struck with a hammer, downward pressure is generated, which drives the spring, nylon guide sleeve, and positioning pin sleeve into the mounting hole of the positioning pin sleeve. During this process, the nylon guide sleeve, together with the stepped top rod, provides guidance and positioning for the positioning pin sleeve, avoiding quality problems such as deformation, installation tilt, and burrs in the positioning pin sleeve. The axial limiting mechanism, together with the fixing bolt, helps to provide axial limiting during the installation of the positioning pin sleeve, ensuring the stability of the installation. The spring helps to lift the stepped top rod with its rebound force after the positioning pin sleeve is installed in place, making it easier to remove the stepped top rod and improving the installation efficiency of the positioning pin sleeve.

[0035] Preferred, such as Figure 2 and Figure 4 As shown, the stepped top rod 2 includes: a handle 21, a spring abutment block 22, a first stepped post 23, a second stepped post 24, and a third stepped post 25; the handle 21, the spring abutment block 22, the first stepped post 23, the second stepped post 24, and the third stepped post 25 are connected coaxially in sequence, and their diameters decrease in sequence.

[0036] The advantages of adopting the above preferred solution are: it facilitates the formation of a stepped shape, providing installation positions for the spring, nylon guide sleeve, and locating pin sleeve.

[0037] Preferred, such as Figure 2 and Figure 4 As shown, the positioning pin sleeve 5 is sleeved on the third step column 25, and its top end abuts against the bottom end of the second step column 24. The outer wall of the positioning pin sleeve 5 is set with the same diameter as the outer wall of the second step column 24.

[0038] The advantages of adopting the above preferred solution are: it allows the nylon guide sleeve fitted on the second step column to be fitted on the positioning pin sleeve at the same time, thereby providing guidance and protection for the positioning pin sleeve and preventing the thin-walled positioning pin sleeve from deforming due to force.

[0039] Preferred, such as Figure 2 and Figure 4As shown, the nylon guide sleeve 4 is sleeved on the second step post 24 and the positioning pin sleeve 5, and its top end abuts against the bottom end of the first step post 23. The outer wall of the nylon guide sleeve 4 is set with the same diameter as the outer wall of the first step post 23.

[0040] The advantages of adopting the above preferred solution are: the nylon guide sleeve is made of plastic, which helps to achieve guidance and positioning while avoiding damage to the crankshaft counterweight mounting surface, thus preventing poor fit between the counterweight and the crankshaft mounting surface and affecting product quality.

[0041] Preferred, such as Figure 2 and Figure 4 As shown, the spring 3 is sleeved on the first stepped column 23 and the nylon guide sleeve 4, and its top end is connected to the bottom end of the spring abutment block 22.

[0042] The advantages of adopting the above-mentioned preferred solution are: the spring helps to lift the stepped top rod by using the rebound force after the positioning pin sleeve is installed in place, which facilitates the removal of the stepped top rod and improves the installation efficiency of the positioning pin sleeve.

[0043] Preferred, such as Figure 2 and Figure 3 As shown, the axial limiting mechanism 1 includes an axial limiting plate 11, which is a plate-shaped structure with a groove at one end. The axial limiting plate 11 is clamped on the crankshaft crank, and the end with the groove is in contact with the crankshaft counterweight mounting surface 7. The fixing bolt 6 passes through the axial limiting plate 11 and is connected to the crankshaft crank. The axial limiting plate 11 is provided with a guide hole 16, which is a through hole coaxially arranged with the positioning pin sleeve mounting hole 8.

[0044] The advantages of adopting the above preferred solution are: the groove at one end of the axial limiting plate is conducive to the adaptation with the crankshaft crank, thereby fitting with the crankshaft counterweight mounting surface, which facilitates the subsequent installation of the positioning pin sleeve.

[0045] Preferred, such as Figure 2 As shown, under the action of downward pressure, the third step post 25 and the positioning pin sleeve 5 pass through the guide hole 16. The bottom end of the third step post 25 and the bottom end of the positioning pin sleeve 5 abut against the inner wall of the bottom end of the positioning pin sleeve mounting hole 8, and the outer wall of the positioning pin sleeve 5 abuts against the circumferential inner wall of the positioning pin sleeve mounting hole 8.

[0046] The advantages of adopting the above preferred solution are: it facilitates the assembly of the locating pin sleeve with the locating pin sleeve mounting hole under the action of downward pressure, guided by the stepped top rod and the nylon guide sleeve.

[0047] Preferred, such as Figure 2As shown, under the action of downward pressure, the second stepped column 24 and the nylon guide sleeve 4 pass through the guide hole 16, the bottom end of the nylon guide sleeve 4 abuts against the crankshaft counterweight mounting surface 7, and the outer wall of the nylon guide sleeve 4 abuts against the inner wall of the guide hole 16.

[0048] The beneficial effect of adopting the above-mentioned preferred solution is that, through the design of the dimensions, it is convenient to achieve the bottom end of the positioning pin sleeve abutting against the bottom inner wall of the positioning pin sleeve mounting hole when the bottom end of the nylon guide sleeve abuts against the crankshaft counterweight mounting surface, thereby achieving the positioning of the positioning pin sleeve installation.

[0049] Preferably, under the action of downward pressure, the spring 3 is compressed and its bottom end abuts against the top end of the axial limiting plate 11.

[0050] The advantages of adopting the above preferred solution are: it helps to compress and store the spring force to lift the step rod, making it easier to remove the step rod.

[0051] Preferred, such as Figure 1 and Figure 3 As shown, the axial limiting mechanism 1 further includes: multiple abutment plates 12, multiple studs 13, multiple abutment springs 14, and multiple nuts 15; the abutment plate 12 is a plate-shaped structure disposed in the groove of the axial limiting plate 11; the multiple studs 13 are vertically mounted on the multiple abutment plates 12 and pass through the side wall of the axial limiting plate 11; the multiple abutment springs 14 are sleeved on the multiple studs 13; the two ends of the abutment springs 14 are connected to the axial limiting plate 11 and the abutment plate 12 respectively; the multiple nuts 15 are threadedly connected to the multiple studs 13 respectively; and the end of the abutment plate 12 away from the studs 13 abuts against the crankshaft crank.

[0052] The advantages of adopting the above preferred solution are: by turning the nut on the stud, it is easy to adjust the compression of the abutment spring, so that the abutment plate abuts against crankshafts and cranks of different specifications, thereby improving the applicability of this utility model.

[0053] The working process of this utility model is described below:

[0054] like Figures 1 to 4As shown, first, the axial limiting mechanism 1 is clamped onto the crankshaft crank, so that the side of the axial limiting plate 11 with the groove is in contact with the crankshaft counterweight mounting surface 7. At the same time, the displacement of the nut 15 on the stud 13 is adjusted so that the abutment plate 12 abuts against the crankshaft crank. The fixing bolt 6 is then passed through the axial limiting plate 11 and connected to the crankshaft crank. Then, the positioning pin sleeve 5 is sequentially fitted onto the third step column 25, the nylon guide sleeve 4 is fitted onto the second step column 24, and the spring is fitted onto the first step column 23. Next, the stepped top rod 2 and the nylon guide sleeve fitted onto it are... The guide sleeve 4 and the positioning pin sleeve 5 pass through the guide hole 16. At this time, the positioning pin sleeve 5 and the third step post 25 are aligned with the positioning pin sleeve mounting hole 8. Finally, the handle 21 is struck with a hammer to provide downward pressure, so that the positioning pin sleeve 5 enters the positioning pin sleeve mounting hole 8. When the bottom end of the nylon guide sleeve 4 abuts against the crankshaft counterweight mounting surface 7, it indicates that the depth of the positioning pin sleeve 5 in the positioning pin sleeve mounting hole 8 has reached the installation requirement, thus completing the guidance and positioning of the positioning pin sleeve 5. After releasing the handle 21, the step rod 2 will be lifted by the rebound force of the spring 3, making it easy for the operator to remove.

[0055] 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.

[0056] 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.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical connection; 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.

[0058] 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.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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 present 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] 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 crankshaft counterweight positioning pin sleeve installation device, characterized in that, include: The axial limiting mechanism (1), stepped top rod (2), spring (3), nylon guide sleeve (4), and fixing bolt (6) are provided. The axial limiting mechanism (1) is detachably mounted on the crankshaft counterweight mounting surface (7). The fixing bolt (6) passes through the axial limiting mechanism (1) and is connected to the crankshaft crank. The positioning pin sleeve (5), the nylon guide sleeve (4), and the spring (3) are sleeved from the inside to the outside of the stepped top rod (2). The positioning pin sleeve (5), the nylon guide sleeve (4), and the spring (3) are arranged sequentially along the axial direction of the stepped top rod (2). The stepped top rod (2) and the nylon guide sleeve (4) are detachably mounted through the axial limiting mechanism (1), and the positioning pin sleeve (5) is fitted into the positioning pin sleeve mounting hole (8).

2. The crankshaft counterweight positioning pin sleeve installation device according to claim 1, characterized in that, The stepped top rod (2) includes: a handle (21), a spring abutment block (22), a first step post (23), a second step post (24), and a third step post (25); the handle (21), the spring abutment block (22), the first step post (23), the second step post (24), and the third step post (25) are coaxially connected in sequence, and their diameters decrease in sequence.

3. The crankshaft counterweight positioning pin sleeve installation device according to claim 2, characterized in that, The positioning pin sleeve (5) is sleeved on the third step column (25), and its top end abuts against the bottom end of the second step column (24). The outer wall of the positioning pin sleeve (5) is set with the same diameter as the outer wall of the second step column (24).

4. The crankshaft counterweight positioning pin sleeve installation device according to claim 2, characterized in that, The nylon guide sleeve (4) is sleeved on the second step post (24) and the positioning pin sleeve (5), and its top end abuts against the bottom end of the first step post (23). The outer wall of the nylon guide sleeve (4) is set with the same diameter as the outer wall of the first step post (23).

5. The crankshaft counterweight positioning pin sleeve installation device according to claim 2, characterized in that, The spring (3) is sleeved on the first step post (23) and the nylon guide sleeve (4), and its top end is connected to the bottom end of the spring abutment block (22).

6. The crankshaft counterweight positioning pin sleeve installation device according to claim 2, characterized in that, The axial limiting mechanism (1) includes an axial limiting plate (11), which is a plate-shaped structure with a groove at one end. The axial limiting plate (11) is clamped on the crankshaft crank, and the end with the groove is in contact with the crankshaft counterweight mounting surface (7). The fixing bolt (6) passes through the axial limiting plate (11) and is connected to the crankshaft crank. The axial limiting plate (11) is provided with a guide hole (16), which is a through hole coaxially arranged with the positioning pin sleeve mounting hole (8).

7. The crankshaft counterweight positioning pin sleeve installation device according to claim 6, characterized in that, Under the action of downward pressure, the third step column (25) and the positioning pin sleeve (5) pass through the guide hole (16). The bottom end of the third step column (25) and the bottom end of the positioning pin sleeve (5) abut against the inner wall of the bottom end of the positioning pin sleeve mounting hole (8). The outer wall of the positioning pin sleeve (5) abuts against the circumferential inner wall of the positioning pin sleeve mounting hole (8).

8. The crankshaft counterweight positioning pin sleeve installation device according to claim 6, characterized in that, Under the action of downward pressure, the second stepped column (24) and the nylon guide sleeve (4) pass through the guide hole (16), the bottom end of the nylon guide sleeve (4) abuts against the crankshaft counterweight mounting surface (7), and the outer wall of the nylon guide sleeve (4) abuts against the inner wall of the guide hole (16).

9. The crankshaft counterweight positioning pin sleeve installation device according to claim 6, characterized in that, Under the action of downward pressure, the spring (3) is compressed and its bottom end abuts against the top end of the axial limiting plate (11).

10. The crankshaft counterweight positioning pin sleeve installation device according to claim 6, characterized in that, The axial limiting mechanism (1) further includes: multiple abutment plates (12), multiple studs (13), multiple abutment springs (14), and multiple nuts (15); the abutment plate (12) is a plate-shaped structure disposed in the groove of the axial limiting plate (11); the multiple studs (13) are vertically installed on the multiple abutment plates (12) one by one and pass through the side wall of the axial limiting plate (11); the multiple abutment springs (14) are sleeved on the multiple studs (13) one by one; the two ends of the abutment springs (14) are connected to the axial limiting plate (11) and the abutment plate (12) one by one; the multiple nuts (15) are threadedly connected to the multiple studs (13) one by one; and the end of the abutment plate (12) away from the studs (13) abuts against the crankshaft crank.

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