A pulley positioning method and axial positioning mechanism

Abstract

This invention discloses a pulley positioning method. First, the pulley assembly is installed in the gap between the inner and outer sides of the inner arm, aligning the inner ring of the pulley assembly's bearing with the mounting hole of the outer arm. Then, a positioning shaft is inserted into the positioning hole of the pulley shaft, and the angle of the positioning shaft is adjusted so that the positioning cap is in a retracted state. Next, the pulley shaft with the positioning shaft installed is inserted into the mounting hole and the inner ring of the pulley assembly's bearing. Subsequently, the positioning shaft is rotated to adjust the positioning cap to an unfolded state to position the pulley assembly. Finally, the pulley shaft and the positioning shaft are fixed. Rotating the positioning shaft on the outside of the outer arm allows the positioning cap to axially limit the pulley assembly, while the limiting part can circumferentially limit the positioning cap, ensuring the stability of the positioning and reducing the difficulty of positioning. This invention also provides an axial positioning mechanism applied to the above-described pulley positioning method, which has the aforementioned advantages.

Description

Technical Field

[0001] This invention relates to the technical field, and in particular to a pulley positioning method. The invention also relates to an axial positioning mechanism applicable to the aforementioned pulley positioning method. Background Technology

[0002] Existing aerial work platforms or cranes typically use wire ropes to extend and retract the boom, with pulleys positioned on the side of the boom. Because there are sliders on the side of the inner boom base, the installation process requires first inserting the inner boom into the outer boom, then installing the pulleys through the gap between the two boom sections, and finally positioning the pulleys. The limited operating space during pulley positioning increases the difficulty of positioning the pulleys and also affects the stability of the positioning.

[0003] Therefore, how to reduce the difficulty of axial positioning of pulleys is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a pulley positioning method that enables the positioning of the pulley assembly by operating from the outside of the outer arm, thereby reducing the difficulty of positioning the pulley assembly and improving the stability of the positioning. Another purpose of this invention is to provide an axial positioning mechanism applied to the above-mentioned pulley positioning method.

[0005] To achieve the above objectives, the present invention provides a pulley positioning method, comprising:

[0006] Install the pulley assembly into the gap between the inner arm side and the outer arm side, so that the inner ring of the bearing of the pulley assembly is aligned with the mounting hole of the outer arm;

[0007] Insert the positioning shaft into the positioning hole of the pulley shaft. One end of the positioning shaft is provided with a positioning cap for positioning the pulley assembly. Adjust the angle of the positioning shaft so that the positioning cap of the positioning shaft is in the retracted state.

[0008] Insert the pulley shaft with the positioning shaft already installed into the mounting hole and the inner ring of the bearing of the pulley assembly;

[0009] Rotate the positioning shaft to adjust the positioning cap to the unfolded state to position the pulley assembly. The end face of the pulley shaft located in the gap has a limiting part, which circumferentially limits the positioning cap when the positioning cap is in the unfolded state.

[0010] Fix the pulley shaft and the positioning shaft.

[0011] Preferably, the limiting part is the limiting groove with a side opening, the positioning hole is located at the bottom of the limiting groove, and the axis of the positioning hole is at a preset distance from the axis of the pulley shaft;

[0012] When the positioning cap is in the stored state, the projection of the positioning cap on the mating surface is completely within the projection range of the pulley shaft on the mating surface, and the mating surface is the plane where the end face of the pulley shaft located within the gap is located.

[0013] Preferably, the positioning cap includes two arc-shaped sides, one of which is a positioning side and the other is a limiting side, and the distance between the positioning side and the positioning axis is greater than the distance between the limiting side and the positioning axis.

[0014] When the positioning cap is in the unfolded state, the projection of the positioning edge on the mating surface is outside the projection range of the pulley shaft on the plane.

[0015] Preferably, the end of the pulley shaft located outside the gap is provided with a base plate;

[0016] The fixing of the pulley shaft and the positioning shaft includes:

[0017] The base plate is fixedly connected to the outer arm using fixing bolts.

[0018] Preferably, the end of the pulley shaft located outside the gap is provided with a base plate;

[0019] The fixing of the pulley shaft and the positioning shaft includes:

[0020] The base plate is fixedly connected to the outer arm using fixing bolts.

[0021] Preferably, the end of the positioning shaft away from the positioning cap is provided with an external thread;

[0022] The method for fixing the pulley shaft and the positioning shaft further includes:

[0023] The positioning shaft is fixed by a positioning nut, so that the positioning cap fits against the inner ring of the bearing of the pulley assembly.

[0024] Preferably, the end of the positioning shaft away from the positioning cap is provided with a position indicator for indicating the position of the positioning cap.

[0025] Preferably, the position indicator is a position indicator protrusion extending away from the positioning cap, the cross-section of the position indicator protrusion is semi-circular, and the position indicator protrusion corresponds to the position of the positioning cap;

[0026] The step of rotating the positioning shaft to adjust the positioning cap to the unfolded state to position the pulley assembly includes:

[0027] Rotate the positioning shaft 180° and pull the positioning shaft along its axial direction to allow the positioning cap to enter the limiting groove.

[0028] The present invention also provides an axial positioning mechanism applicable to any of the pulley positioning methods described above, comprising a pulley shaft and a positioning shaft, wherein the pulley shaft has a positioning hole extending axially, the positioning shaft is installed in the positioning hole, the end of the positioning shaft located on the inner side of the outer arm is provided with a positioning cap for axial positioning of the pulley assembly, the end face of the pulley shaft located on the inner side of the outer arm is provided with a limiting part for circumferential positioning of the positioning cap, and the end of the positioning shaft located on the outer side of the outer arm is fixed by the positioning part.

[0029] The pulley positioning method provided by this invention first involves installing the pulley assembly into the gap between the inner arm side and the outer arm side, aligning the inner ring of the pulley assembly's bearing with the mounting hole of the outer arm; then, inserting the positioning shaft into the positioning hole of the pulley shaft, with a positioning cap at one end of the positioning shaft for positioning the pulley assembly; adjusting the angle of the positioning shaft to retract the positioning cap; then inserting the pulley shaft with the positioning shaft installed into the mounting hole and the inner ring of the pulley assembly's bearing; subsequently, rotating the positioning shaft to adjust the positioning cap to the unfolded state to position the pulley assembly; a limiting part is located at one end of the pulley shaft within the gap, which circumferentially limits the positioning cap when it is in the unfolded state; finally, fixing the pulley shaft and the positioning shaft.

[0030] The pulley positioning process can be completed on the outer side of the outer wall. Rotating the positioning shaft can make the positioning cap axially limit the pulley assembly, while the limiting part can circumferentially limit the positioning cap, ensuring the firmness of the positioning and reducing the difficulty of positioning.

[0031] The present invention also provides an axial positioning mechanism applied to the above-described pulley positioning method, and has the aforementioned advantages. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 A flowchart of the pulley positioning method provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the axial positioning mechanism provided by the present invention in its retracted state.

[0035] Figure 3 for Figure 2 A schematic diagram of the central axis positioning mechanism in its unfolded state inside;

[0036] Figure 4 for Figure 2 A schematic diagram of the central axis positioning mechanism in its retracted state.

[0037] Figure 5 for Figure 2 A schematic diagram of the central axis positioning mechanism in its outward unfolded state;

[0038] Figure 6 for Figure 2 Schematic diagram of the middle pulley shaft;

[0039] Figure 7 for Figure 2 Schematic diagram of the middle positioning axis;

[0040] Figure 8 This is a schematic diagram of the pulley assembly.

[0041] Figure 9 for Figure 2 A cross-sectional view of the central axis positioning mechanism in its stowed state;

[0042] Figure 10 for Figure 2 A cross-sectional view of the central axis positioning mechanism in its deployed state;

[0043] Figure 11 This is a schematic diagram of a telescopic boom without an axial positioning mechanism installed.

[0044] Figure 12 This is a schematic diagram of a telescopic boom equipped with an axial positioning mechanism.

[0045] in, Figures 1 to 12 The attached figures are labeled as follows:

[0046] 1. Fixing bolt, 2. Pulley shaft, 3. Positioning nut, 4. Positioning shaft, 5. Pulley assembly, 6. Outer arm, 7. Inner arm, 21. Positioning hole, 22. Limiting groove, 23. Base plate, 41. Positioning cap, 42. Indicator protrusion, 61. Mounting hole, 411. Positioning edge, 412. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Please refer to Figures 1 to 12 .

[0050] The pulley positioning method provided by this invention includes:

[0051] S1. Insert the pulley assembly 5 into the gap between the side of the inner arm 7 and the side of the outer arm 6, so that the inner ring of the bearing of the pulley assembly 5 is aligned with the mounting hole 61 of the outer arm 6.

[0052] like Figure 11 As shown, the inner arm 7 is inserted into the outer arm 6, with a gap between them. The pulley assembly 5 is installed in the gap. The installation method can refer to the existing technology, and will not be described in detail here.

[0053] S2. Insert the positioning shaft 4 into the positioning hole 21 of the pulley shaft 2. One end of the positioning shaft 4 is provided with a positioning cap 41 for positioning the pulley assembly 5. Adjust the angle of the positioning shaft 4 so that the positioning cap 41 of the positioning shaft 4 is in the retracted state.

[0054] Optionally, the positioning hole 21 adopts an eccentric structure in the pulley shaft 2, that is, the axis of the positioning hole 21 is separated from the axis of the pulley shaft 2 by a preset distance, which is less than the radius difference between the pulley shaft 2 and the positioning hole 21. The positioning cap 41 is in a retracted state when it rotates to the side of the positioning hole 21 that is close to the axis of the pulley shaft 2.

[0055] When the positioning cap 41 is in the stored state, the projection of the positioning cap 41 on the mating surface is completely within the projection range of the pulley shaft 2 on the mating surface. The mating surface is the plane where the end face of the pulley shaft 2 located in the gap is located.

[0056] At this time, the outer periphery of the positioning cap 41 will not exceed the outer periphery of the pulley shaft 2, thus facilitating the installation of the pulley shaft 2 into the mounting hole 61.

[0057] S3. Insert the pulley shaft 2 with the positioning shaft 4 already installed into the mounting hole 61 and the inner ring of the bearing of the pulley assembly 5;

[0058] The structure of the pulley shaft 2 with the positioning shaft 4 already installed is as follows: Figure 2 As shown, the pulley shaft 2 is inserted into the mounting hole 61 and the inner ring of the bearing. At this time, the pulley assembly 5 can rotate around the pulley shaft 2, but the axial positioning mechanism does not axially limit the pulley assembly 5, as shown. Figure 9 As shown, the pulley assembly 5 can still move towards the inner arm 7.

[0059] S4. Rotate the positioning shaft 4 to adjust the positioning cap 41 to the unfolded state. Position the pulley assembly 5. The end face of the pulley shaft 2 located in the gap has a limiting part. The limiting part circumferentially limits the positioning cap 41 when the positioning cap 41 is in the unfolded state.

[0060] Rotating the positioning shaft 4 allows the positioning cap 41 to be adjusted to the unfolded state. In the unfolded state, the projection of one side of the positioning cap 41 onto the mating surface lies outside the projection range of the pulley shaft 2 on that plane. For example... Figure 3 and Figure 10 As shown, the positioning cap 41 is located on the side of the pulley assembly 5 away from the outer arm 6, and limits the inner ring of the bearing of the pulley assembly 5.

[0061] Optionally, the limiting part is a limiting groove 22 with a side opening, and the positioning hole 21 is located at the bottom of the limiting groove 22. The positioning cap 41 includes two arc-shaped sides, one of which is a positioning edge 411 and the other is a limiting edge 412. The distance between the positioning edge 411 and the axis of the positioning shaft 4 is greater than the distance between the limiting edge 412 and the axis of the positioning shaft 4. The curvature of the side wall of the limiting groove 22 is equal to the curvature of the limiting edge 412, and the distance between the side wall of the limiting groove 22 and the axis of the positioning hole 21 is equal to the distance between the limiting edge 412 and the axis of the positioning shaft 4. Therefore, when the positioning cap 41 rotates to the position corresponding to the limiting groove 22, the positioning cap 41 can enter the limiting groove 22, and the side wall of the limiting groove 22 can limit the positioning cap 41 through the limiting edge 412 to prevent the positioning cap 41 from rotating.

[0062] Optionally, the end of the positioning shaft 4 away from the positioning cap 41 is provided with an indicator for indicating the position of the positioning cap 41, and the assembly personnel can determine the position of the positioning cap 41 through the indicator.

[0063] Optionally, the position indicator is a position protrusion 42 extending away from the positioning cap 41, such as... Figure 4 and Figure 5 As shown, the cross-section of the positioning protrusion 42 is semi-circular, and the position of the positioning protrusion 42 corresponds to that of the positioning cap 41. During the positioning of the pulley assembly 5, the positioning shaft 4 is rotated 180°, and then the positioning shaft 4 is pulled along the axial direction of the positioning shaft 4, so that the positioning cap 41 enters the limiting groove 22, thereby achieving the positioning of the pulley assembly 5, and at the same time, the limiting groove 22 limits the positioning cap 41.

[0064] S5, fixed pulley shaft 2 and positioning shaft 4.

[0065] Optionally, the pulley shaft 2 has a base plate 23 at one end outside the clearance. The base plate 23 has a fixing hole that extends through the thickness direction, and the outer arm 6 has a threaded hole located around the mounting hole 61. When fixing the pulley shaft 2, the fixing bolt 1 passes through the fixing hole and connects to the threaded hole. Of course, the user can also fix the base plate 23 to the outer arm 6 by welding or other methods as needed, which is not limited here.

[0066] Optionally, the end of the positioning shaft 4 furthest from the positioning cap 41 has an external thread. When rotated to the unfolded state, the external thread of the positioning shaft 4 extends out of the gap between the outer arm 6 and the inner arm 7. The assembler connects the positioning nut 3 to the positioning shaft 4, with the bolt preload directed axially outward from the gap along the positioning shaft 4. The bolt preload ensures that the positioning cap 41 fits tightly against the inner ring of the bearing in the pulley assembly 5.

[0067] In this embodiment, the pulley positioning method only requires operation on the outer side of the outer arm 6. The pulley shaft 2 is connected to the inner ring of the bearing of the pulley assembly 5. Then, the positioning shaft 4 is rotated to axially position the pulley assembly 5. Finally, the pulley shaft 2 and the positioning shaft 4 are fixed to complete the positioning of the pulley assembly 5. The operation process is simple, the positioning difficulty is low, and the stability of the pulley assembly 5 positioning can be guaranteed.

[0068] The axial positioning mechanism provided by this invention has the following structure: Figures 1 to 4 As shown, the assembly includes a pulley shaft 2 and a positioning shaft 4. One end of the pulley shaft 2 has a base plate 23, and the outer arm has a mounting hole. The pulley shaft 2 is inserted into the mounting hole, and the base plate 23 fits against the outer side of the outer arm and is connected to the outer arm by a fixing bolt 1. The pulley assembly 5 includes a bearing, which is mounted on the outer circumference of the pulley shaft 2. The pulley shaft 2 has a positioning hole 21 extending axially therefrom, and the positioning shaft 4 is mounted in the positioning hole 21.

[0069] A positioning cap 41 is provided at one end of the positioning shaft 4 located on the inner side of the outer arm. The plane of the end face of the pulley shaft 2 located on the inner side of the outer wall is the mating surface. Rotating the positioning shaft 4 can adjust the position of the positioning cap 41, allowing the positioning cap 41 to switch between an unfolded state and a retracted state. The positioning cap 41 is located on the side of the pulley assembly 5 away from the base plate 23. When the positioning cap 41 is in the retracted state, the projection of the positioning cap 41 on the mating surface is completely within the projection range of the pulley shaft 2 on the mating surface. At this time, the pulley shaft 2 can drive the positioning cap 41 to insert into the mounting hole and connect with the pulley assembly 5. When the positioning cap 41 is in the unfolded state, a part of the projection of the positioning cap 41 on the mating surface is outside the projection of the pulley shaft 2 on the mating surface. This part can provide axial positioning for the pulley assembly 5. A limiting part is provided at the end face of the pulley shaft 2 located on the inner side of the outer arm. The limiting part can provide circumferential positioning for the positioning cap 41, ensuring that the positioning cap 41 is always in the unfolded state when the pulley rotates. In addition, the end of the positioning shaft 4 located on the outer side of the outer arm is connected to the positioning part, and the positioning part fixes the positioning shaft 4.

[0070] Optionally, the limiting part is a limiting groove 22 with a side opening, and the positioning hole 21 is located at the bottom of the limiting groove 22. Figure 5As shown, the top and upper sides of the limiting groove 22 are open. When the positioning cap 41 is in the limiting groove 22, it is in the unfolded state; when the positioning cap 41 is in the retracted state, it is outside the limiting groove 22, and the positioning cap 41 is in contact with the end face of the pulley shaft 2. At this time, the end face of the pulley shaft 2 supports the positioning cap 41, ensuring that it will not enter the limiting groove 22. During the process of switching from the retracted state to the unfolded state, the positioning cap 41 enters the limiting groove 22 from the top and extends from the side opening to position the pulley assembly 5. The side wall of the limiting groove 22 can limit the positioning cap 41 to prevent it from rotating. Of course, the limiting part can also adopt a limiting protrusion or other structures, which are not limited here.

[0071] Optionally, the positioning cap 41 includes two arcuate sides, each with a central angle less than 180°, thus forming a leaf-like structure. One arcuate side of the positioning cap 41 is the positioning edge 411, and the other is the limiting edge 412. The distance between the positioning edge 411 and the axis of the positioning shaft 4 is greater than the distance between the limiting edge 412 and the axis of the positioning shaft 4. When the positioning cap 41 is in the unfolded state, the positioning edge 411 is located outside the limiting groove 22, positioning the pulley assembly 5. In addition, the sidewall of the limiting groove 22 is also set along an arc, and the shape of the arc is the same as that of the limiting edge 412. The distance between the sidewall of the limiting groove 22 and the axis of the positioning hole 21 is equal to the distance between the limiting edge 412 and the axis of the positioning shaft 4, and both are less than the radius of curvature of the limiting edge 412. Therefore, the sidewall of the limiting groove 22 can limit the positioning cap 41. Of course, users can also set the positioning cap 41 and the limiting groove 22 to other shapes as needed, which is not limited here.

[0072] Optionally, the positioning hole 21 adopts an eccentric structure in the pulley shaft 2, that is, the axis of the positioning hole 21 is separated from the axis of the pulley shaft 2 by a preset distance, which is less than the radius difference between the pulley shaft 2 and the positioning hole 21.

[0073] Optionally, the positioning part is a positioning nut 3, and the end of the positioning shaft 4 away from the positioning cap 41 is provided with an external thread. The positioning nut 3 and the positioning shaft 4 are connected by the thread. Of course, the user can also use a fixing clip or a fixing pin to axially position the positioning shaft 4.

[0074] Optionally, the positioning shaft 4 has a position indicator at one end located on the outer side of the outer arm, which can indicate the position of the positioning cap 41. The assembly personnel can determine whether the positioning cap 41 can enter the limiting groove 22 by observing the position of the position indicator.

[0075] Optionally, the indicating portion is an indicating protrusion 42 extending away from the positioning cap 41, and the cross-section of the indicating protrusion 42 is semi-circular. The positioning edge 411 of the positioning cap 41 is located in a fan-shaped region centered on a point on the positioning axis 4, and this fan-shaped region is in the same direction as the semi-circle of the indicating protrusion 42. Therefore, the assembler can determine the angle of the positioning cap 41 based on the angle of the indicating protrusion 42.

[0076] Additionally, when the positioning cap 41 is in the retracted state, the height of the indicator protrusion 42 is relatively low. The operator continuously rotates the positioning shaft 4 until the positioning cap 41 enters the positioning groove. At the same time, the indicator protrusion 42 will also extend outward from the base plate 23, at which point the indicator protrusion 42 can extend beyond the positioning nut 3. The assembly personnel can also determine whether the axial positioning mechanism has completed positioning based on the height of the indicator protrusion 42.

[0077] In this embodiment, the axial positioning mechanism includes a positioning shaft 4 within the pulley shaft 2. A positioning cap 41 on the positioning shaft 4 engages with a limiting groove 22 on the pulley shaft 2 to axially position the pulley assembly 5. During positioning, the assembler only needs to rotate the positioning shaft 4 from the outside of the outer arm to allow the positioning cap 41 to enter the limiting groove 22. Finally, a positioning nut 3 is installed from the outside to secure the positioning shaft 4. The entire positioning process is performed on the outside of the outer arm, reducing operational difficulty and improving positioning reliability.

[0078] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0079] The pulley positioning method and axial positioning mechanism provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A pulley positioning method, characterized in that, include: Insert the pulley assembly (5) into the gap between the side of the inner arm (7) and the side of the outer arm (6), so that the inner ring of the bearing of the pulley assembly (5) is aligned with the mounting hole (61) of the outer arm (6); Insert the positioning shaft (4) into the positioning hole (21) of the pulley shaft (2). One end of the positioning shaft (4) is provided with a positioning cap (41) for positioning the pulley assembly (5). Adjust the angle of the positioning shaft (4) so ​​that the positioning cap (41) of the positioning shaft (4) is in the stored state. Insert the pulley shaft (2) with the positioning shaft (4) already installed into the mounting hole (61) and the bearing inner ring of the pulley assembly (5); Rotate the positioning shaft (4) to adjust the positioning cap (41) to the unfolded state to position the pulley assembly (5). The end face of the pulley shaft (2) located in the gap has a limiting part. The limiting part circumferentially limits the positioning cap (41) when the positioning cap (41) is in the unfolded state. Fix the pulley shaft (2) and the positioning shaft (4); The limiting part is a limiting groove (22) with a side opening. The positioning hole (21) is located at the bottom of the limiting groove (22). The axis of the positioning hole (21) is at a preset distance from the axis of the pulley shaft (2). When the positioning cap (41) is in the stored state, the projection of the positioning cap (41) on the mating surface is completely within the projection range of the pulley shaft (2) on the mating surface. The mating surface is the plane where the end face of the pulley shaft (2) is located at one end of the gap. The positioning cap (41) includes two arc-shaped sides, one of which is a positioning edge (411) and the other is a limiting edge (412). The distance between the positioning edge (411) and the axis of the positioning shaft (4) is greater than the distance between the limiting edge (412) and the axis of the positioning shaft (4). When the positioning cap (41) is in the unfolded state, the projection of the positioning edge (411) on the mating surface is located outside the projection range of the pulley shaft (2) on the plane; The positioning shaft (4) has a positioning part at one end away from the positioning cap (41) to indicate the position of the positioning cap (41); The position indicator is a position indicator protrusion (42) extending away from the positioning cap (41). The cross-section of the position indicator protrusion (42) is semi-circular, and the position indicator protrusion (42) corresponds to the position of the positioning cap (41). The step of rotating the positioning shaft (4) to adjust the positioning cap (41) to the unfolded state to position the pulley assembly (5) includes: Rotate the positioning shaft (4) 180° and pull the positioning shaft (4) along the axial direction of the positioning shaft (4) so ​​that the positioning cap (41) enters the limiting groove (22); The pulley shaft (2) is provided with a base plate (23) at one end outside the gap; The method of fixing the pulley shaft (2) and the positioning shaft (4) includes: The base plate (23) is fixedly connected to the outer arm (6) by fixing bolts (1); The end of the positioning shaft (4) away from the positioning cap (41) is provided with an external thread; The method for fixing the pulley shaft (2) and the positioning shaft (4) further includes: The positioning shaft (4) is fixed by the positioning nut (3) so that the positioning cap (41) fits against the inner ring of the bearing of the pulley assembly (5).

2. An axial positioning mechanism, applied to the pulley positioning method of claim 1, characterized in that, The assembly includes a pulley shaft (2) and a positioning shaft (4). The pulley shaft (2) has a positioning hole (21) extending axially. The positioning shaft (4) is installed in the positioning hole (21). The end of the positioning shaft (4) located inside the outer arm (6) is provided with a positioning cap (41) for axial positioning of the pulley assembly (5). The end face of the pulley shaft (2) located inside the outer arm (6) is provided with a limiting part for circumferentially limiting the positioning cap (41). The end of the positioning shaft (4) located outside the outer arm (6) is fixed by the positioning part.

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