Pin shaft assembly, pin shaft pair and roller cage

Abstract

The application discloses a pin shaft assembly, a pin shaft pair and a roller cage, wherein the pin shaft assembly is the basis of the pin shaft pair, the pin shaft pair can be used as the pin shaft pair of the roller cage, and the pin shaft assembly comprises a pin shaft, the pin shaft is provided with a shoulder at both ends, end faces of the pin shaft are provided with coaxial taper blind holes, at least two notches are formed in side walls of the taper blind holes, a taper plug is matched with the taper blind hole, a cover is matched with the shoulder, and the cover is used for pressing the taper plug to press the taper plug into the taper blind hole, so that the shoulder is expanded to form an interference connection or a form locking with the cover. The pin shaft assembly disclosed by the application has good reliability, and the gap between the pin shaft assembly and a pin shaft hole is relatively easy to control.

Description

TECHNICAL FIELD

[0001] The present application relates to a pin shaft assembly for a roller cage, and also relates to a pin shaft pair formed by the pin shaft assembly, and to a roller cage equipped with the pin shaft pair. BACKGROUND

[0002] The coal industry standard "MT236-2011 Rectangular Steel Tank Guide Roller Cage" (hereinafter referred to as the standard) specifies the basic structure and main parameters of the roller cage. The standard provides that the roller cage is composed of a single row or double row roller, a buffer device and a chassis. The buffer device uses butterfly springs or rubber springs as buffer elements, or uses a combination of spring and hydraulic-gas buffer shock absorber. The condition for generating the buffer is that the chassis, also commonly known as the lower support, and the roller are installed on the upper support (also known as the swing frame) through the roller shaft. The upper support is hinged with the lower support through the main pin shaft, so that the upper support has the ability to swing. The buffer is located at the rear side of the upper support, one end of the buffer is hinged with the upper end of the upper support through the upper pin shaft, and the other end of the buffer is hinged with the lower support through the lower pin shaft, thereby forming a triangular mechanism.

[0003] In the field, the direction in which the roller hits or acts on the guide is forward, and the opposite direction is rear. Based on the triangular mechanism, when the roller runs on the guide and generates vibration, the buffer located at the rear side of the upper support will expand and contract, thereby achieving buffering. Correspondingly, the expansion and contraction of the buffer is equivalent to a change in the length of one side of the triangular mechanism. Accordingly, the upper support needs to swing to adapt to this change.

[0004] Due to the frequent swinging of the upper support, higher requirements are placed on the structure of the main pin shaft and its installation method on the roller cage. The same requirements also apply to the upper pin shaft and the lower pin shaft.

[0005] The traditional main pin shaft usually has a ring-shaped head at one end. After the main pin shaft is inserted into the pin shaft hole, the head forms an end limit. The other end of the main pin shaft usually has a radial hole, which is an open pin hole. The part with the open pin hole is exposed from the pin shaft hole, and then an open pin is fitted, forming a limit for the other end of the main pin shaft, thereby preventing the main pin shaft from coming out of the pin shaft hole.

[0006] The traditional main pin shaft has a relatively large gap with the corresponding main pin shaft hole, which is a relatively rough fit. Since most roller cages have the roller shaft fixed at one end of the upper support in a cantilevered state, it is obvious that the existence of the above-mentioned gap will cause the roller shaft to be inclined to a certain extent, so that the roller cannot be pressed on the guide. The larger the gap, the more serious the inclination, and further, the more likely it is to cause uneven wear of the rubber tire on the roller.

[0007] In addition, as mentioned above, frequent swinging of the upper support is normal, or the use environment of the roller cage, under which the kingpin shaft will axially move in the kingpin hole, and the contact between the cotter pin and the upper support will be generated, and then the friction and wear will be generated, and the cotter pin will be easily broken to cause an accident. SUMMARY

[0008] The present application aims to provide a pin shaft assembly with good reliability and relatively easy control of the gap between the pin shaft hole, and to provide a pin shaft pair formed by the pin shaft assembly and a roller cage provided with the pin shaft pair.

[0009] According to a first aspect of the embodiments of the present application, a pin shaft assembly is provided, comprising:

[0010] a pin shaft, comprising a pin shaft body and a shoulder at both ends of the pin shaft body and integrally formed with the pin shaft body as a stepped shaft, the shoulder having a diameter smaller than that of the pin shaft body; and a tapered blind hole coaxial with the pin shaft is formed in the end face of the pin shaft, and the side wall of the tapered blind hole is provided with at least two slits extending from the end face to the other end and penetrating the side wall radially;

[0011] a tapered plug matched with the tapered blind hole;

[0012] an end cap, comprising a sleeve and a cover sealing one end of the sleeve, wherein the sleeve is sleeved on the outer cylindrical surface of the shoulder, and the cover is used to press the tapered plug to press the tapered plug into the tapered blind hole, so that the shoulder is expanded to form an interference connection or a form locking with the sleeve;

[0013] Correspondingly, the end cap is used for axial positioning of the pin shaft body after the pin shaft body is fitted into the corresponding pin shaft hole.

[0014] Optionally, the depth of the tapered blind hole is greater than the length of the shoulder, and the excess part is 0.30-0.35 times the length of the shoulder.

[0015] Optionally, the slits are four, six or eight, and are arranged in a uniform annular array around the axis of the tapered blind hole.

[0016] Optionally, the length of the sleeve is shorter than the length of the shoulder, and the short part is 0.3-3.0 mm.

[0017] Optionally, the sleeve hole of the sleeve is a tapered hole, and the large end of the tapered hole is on the side of the cover.

[0018] The diameter of the large end of the tapered hole is 2.0-2.5 mm larger than that of the small end.

[0019] The outer contour of the sleeve is a cylindrical surface.

[0020] Correspondingly, the small end diameter of the conical plug is smaller than the hole diameter of the conical blind hole, and the large end diameter of the conical plug is 2.0-2.5 mm larger than the hole diameter of the conical blind hole; and the length of the conical plug is smaller than the depth of the conical blind hole.

[0021] Optionally, the small end diameter of the conical hole is 0.1-0.3 mm larger than the diameter of the stopper.

[0022] Optionally, the sleeve part is provided with a secondary gap, which extends from the other end of the sleeve part to the end of the cover body.

[0023] According to the second aspect of the embodiment of the present application, a pin shaft pair is provided, which comprises:

[0024] The first support provides a shaft sleeve;

[0025] The second support provides two bushings located at the two ends of the shaft sleeve;

[0026] The pin shaft assembly provided by the first aspect of the embodiment of the present application is characterized in that the pin shaft body cooperates with the shaft sleeve to form a rotating pair, and the end cover of the pin shaft assembly is located in the bushing and used for axially limiting the pin shaft body in the shaft sleeve.

[0027] Optionally, the end cover and the bushing are in clearance fit, and the end cover and the bushing form interference fit based on the expansion of the stopper.

[0028] According to the third aspect of the embodiment of the present application, a roller cage is provided, which comprises a lower support, an upper support hinged to the lower support through a first pin shaft assembly, a roller assembly installed on the upper end of the upper support, and a bumper having one end hinged to the upper part of the upper support through a second pin shaft assembly and the other end hinged to the lower support through a third pin shaft assembly, and at least the first pin shaft assembly adopts the pin shaft assembly provided by the first aspect of the embodiment of the present application.

[0029] In the embodiment of the present application, the pin shaft body is used to cooperate with the shaft sleeve provided by the lower support to form a rotating pair, and the two stoppers located at the two ends of the pin shaft body are used to construct the constraint for axially limiting the pin shaft body in the rotating pair. The form of the constraint is that the stopper can be expanded based on the gap and the material of the main pin shaft, and then the conical plug and the end cover are adapted, and in the process of pressing the end cover into the bushing provided by the upper support, the cover body of the end cover pushes the conical plug to move into the conical blind hole, and gradually expands the stopper. The expansion is that the end part of the stopper is larger than the root part, and even if the sleeve part of the end cover has an inner cylindrical surface, the combined force received by the sleeve part on the inner side in the axial direction is higher than that received on the outer side, thereby forming a profile connection or a structure similar to the profile connection (at least an interference connection), and the connection reliability is relatively good. Finally, the constraint function part formed by the outer contour of the end cover has reliable limiting, so that the main pin shaft is not easy to be pulled out. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the assembly structure of the upper bracket in the roller can ear on the lower bracket via a pin assembly in one embodiment.

[0031] Figure 2 This is a schematic diagram of the main cross-sectional structure of the lower support in one embodiment.

[0032] Figure 3 This is a schematic diagram of the main cross-sectional structure of the upper support in one embodiment.

[0033] Figure 4 This is an exploded view of the pin assembly in one embodiment.

[0034] Figure 5 This is a schematic diagram of the pin shaft structure viewed from the left in one embodiment.

[0035] In the diagram: 1. Lower bracket, 2. Pin assembly, 3. Upper bracket.

[0036] 11. Base plate, 12. Vertical plate, 13. Sealing ring, 14. Wear-resistant sleeve, 15. Bushing hole, 16. Bushing.

[0037] 21. End cap, 22. Conical plug, 23. Pin.

[0038] 31. Bushing, 32. Bushing hole, 33. Upper bracket plate, 34. Connecting plate, 35. Roller bushing, 36. Roller shaft hole, 37. Set screw, 38. Back tightening nut. Implementation

[0039] The general structure of the roller can ear has been described in relatively detail in the background section; see also the appendix to the instruction manual. Figure 3 The upper end of the upper bracket 3 is usually equipped with a roller bushing 35. The roller bushing 35 provides a roller shaft hole 36 for mounting the roller shaft on the upper bracket 3. Generally, the roller shaft is inserted into the roller shaft hole 36 and then locked with a set screw 37. In some applications, the roller shaft is also equipped with an axial limiting component, such as a shaft retaining ring.

[0040] Set screw 37 is usually equipped with a backing nut 38 to prevent it from coming loose.

[0041] Except for a few roller can ears, most roller can ears have a roller shaft with one end supported. That is, one end of the roller shaft is fixed to the upper bracket 3, and the other end extends perpendicularly to the upper bracket 3. Then the roller assembly is mounted on the roller shaft through the bearing assembly. In this case, the pin assembly 2 used for hinged mounting of the upper bracket 3 and the lower bracket 1 will inevitably be subjected to a large overturning torque.

[0042] As mentioned above, the force on the roller assembly is usually unbalanced, and the vibration caused thereby has a great influence on the pin shaft assembly 2, so it is necessary to ensure that the pin shaft 23 in the pin shaft assembly 2 cannot be pulled out of the bush hole 15 as shown in the figure under this condition. Figure 2

[0043] In order to more clearly show the features of the present application, in the embodiments of the present application, the three subjects described above are described in a combined manner. It should be noted that although the pin shaft assembly 2 in the embodiments of the present application is first applied to the roller cage, it is understood that the pin shaft assembly 2 in the embodiments of the present application is obviously not limited to the technical field of the roller cage, but can be applied to other fields.

[0044] Figure 1 In the embodiments of the present application, the pin shaft assembly 2 is a king pin shaft assembly for the articulation of the upper bracket 3 on the lower bracket 1, and for the other two pin shaft assemblies 2 in the roller cage, the pin shaft assembly 2 in the embodiments of the present application can be selected or not selected, because the other two pin shaft assemblies 2 have higher requirements for removability.

[0045] The pin shaft assembly 2 is used for the articulation of the upper bracket 3 on the lower bracket 1 in the exemplary structure, and the rotation pair formed by the articulation should rotate smoothly, and in applications such as the roller cage where the vibration is relatively large, the rotation pair is not prone to failure, and the pin shaft 23 in the pin shaft assembly 2 is not allowed to be pulled out of the pin shaft assembly 2. Figure 1

[0046] The structure of the pin shaft assembly 2 can be more clearly shown in the figure, in which the pin shaft assembly 2 includes one pin shaft 23, two tapered plugs 22, and two end covers 21. Figure 4 The pin shaft 23 is a stepped shaft, which has three shaft sections as a whole, the pin shaft body 233 constitutes a shaft section, which is the main shaft section, and the two stops 232 constitute two end shaft sections, and correspondingly, the three shaft sections constitute an integral shaft, which is usually machined on a bar stock.

[0047] In the figure, the two stops 232 are coaxial with the pin shaft body 233.

[0048] The diameter of the stop 232 is smaller than the diameter of the pin shaft body 232. Described with the end cover 21 as a reference, the outer diameter of the end cover 21 is the same as or slightly larger than the outer diameter of the pin shaft body 232. If it is slightly larger, it should be considered based on the fitting tolerance band, for example, if the pin shaft body 232 is clearance fit with the bush hole 15, if the end cover 21 can be fit with the bush hole 15, it can be interference fit.

[0049]

[0050] ​​The diameter of the stopper 232 is smaller than the diameter of the pin body 232, so that the stopper 232 is sufficient to meet the requirement of the end cover 21 being sleeved thereon. Accordingly, the part cooperating with the cylindrical surface of the stopper 232 is the sleeve part of the end cover 21, and the part cooperating with the end surface of the stopper 232 is the inner surface of the cover body of the end cover.

[0051] Further, the pin 23 is provided with a conical blind hole 234 coaxial with the pin 23 at the end surface of the pin 23, and the side wall of the conical blind hole 234 is provided with at least two slits 231 extending through the side wall and from the end surface of the pin 23 to the other end. If two slits 231 are used, they should be symmetrically arranged, i.e. symmetric about a certain median plane of the pin 23.

[0052] The slits 231 are used to interrupt the mutual pulling of the parts of the hole wall of the conical blind hole 234, so as to facilitate the bulging of the stopper 232.

[0053] The tapered plug 22 is the acting head for bulging the stopper 232, and cooperates with the conical blind hole 234 to push the tapered plug 22 to move inward in the conical blind hole 234 by the axial force when the stopper 232 is axially pressed, so as to gradually expand the stopper 232.

[0054] The taper of the tapered plug 22 is the same as the taper of the stopper 232 in the initial state, and since the amount of bulging is not high in the embodiment of the present application, the taper of the tapered plug 22 and the conical blind hole 234 can be relatively large. Figure 4 In the exemplary structure, the taper of the tapered plug 22 is 1:4, and the taper range can be [1:12, 1:3].

[0055] If the original shape of the stopper 232 is an external cylindrical surface, the inevitable result of the bulging of the tapered plug 22 and the conical blind hole 234 is that the diameter of the end part of the stopper 232 is larger than the diameter of the root part, even if the sleeve part of the end cover 21 has an internal cylindrical surface, which will inevitably result in different tightness of the internal and external (the external is divided by the mouth part of the end cover, and the internal is towards the mouth part) cooperation, for example, the internal part is in interference fit, and the external part can not be in mechanical tolerance fit, but in cooperation gap.

[0056] Accordingly, referring to the drawings of the specification Figure 4 , the end cover 21 is a dish as a whole, and can also be understood as a shallow bucket, so that the end cover 21 has a sleeve part and a cover body sealing one end of the sleeve part, and the cover body here is equivalent to a circular plate.

[0057] The sleeve part is sleeved on the outer cylindrical surface of the stopper 232. During the installation process, it is obvious that the sleeve part should be sleeved from the end surface of the stopper 232. During this process, the inner surface of the cover body first contacts the bottom surface of the conical plug 22 which is placed in the conical blind hole 234 and has not yet applied sufficient axial force to the stopper 232. Further axial force is applied to the end cover 21 to press the conical plug 22 into the conical blind hole 234 until the bottom surface of the conical plug 22 is flush with the end surface of the stopper 232.

[0058] Due to the effects of elastic deformation and motion interference, it is difficult to achieve the flush of the end surface, but it is the ideal design requirement under ideal conditions.

[0059] The outer contour of the stopper 232 in the initial state is a cylindrical surface. In principle, at least a slight deformation is required, and the diameter at the end surface is ultimately larger than the diameter at the root. Under this condition, if the deformation is relatively small, the inner contour of the sleeve part is an inner cylindrical surface, and the partial outer contour of the stopper 232, specifically the outer contour near the end surface, is in engagement with the sleeve part to form an interference connection.

[0060] In more applications, the inner contour of the sleeve part is pre-processed into a taper. Based on the basic requirements of locking, the large end is near the end of the cover body, and the small end is at the other end. Under this condition, the stopper 232 can have a relatively large bulging, and when the outer contour of the stopper 232 comes into contact with the tapered inner contour of the sleeve, a relatively reliable type of locking connection is formed.

[0061] As a design size, the diameter (outer contour) of the sleeve part of the end cover 21 can be equivalent to the diameter of the pin shaft body 233, or slightly larger, with a slight amount of 0.1-0.3 mm. Even if the diameter of the sleeve part of the end cover 21 is equal to the diameter of the pin shaft body 233, the deformation of the end cover 21 will occur due to the bulging of the stopper 232, which is sufficient to form a relatively reliable limit.

[0062] In order to reduce the influence of the mutual pulling inside the pin shaft 23 on the bulging of the stopper 232, so that the required axial force applied to the conical plug 22 is relatively small, thereby making it easier to assemble the pin shaft, the depth of the conical blind hole 234 is greater than the length of the stopper 232, and the excess part is 0.30-0.35 times the length of the stopper 232.

[0063] Figure 4 The inner hole of the middle end cover counterbore 211, i.e. the sleeve part, determines the length of the stopper 232, and vice versa. Based on the outer diameter of the end cover and the length of the stopper 232, the length-diameter ratio is preferably 1:3, and under this ratio, the 30% up and down floating is still a usable length-diameter ratio.

[0064] Figure 5This is a schematic diagram of the left side of the pin 23 in one embodiment. It can be seen that there are four notches 231, which are arranged in a circular array on the stop 232. The array axis is the axis of the stop 232.

[0065] The notch 231 is used to create a partition effect, so damage to the outer contour of the stop 232 should be minimized as much as possible, so that the outer contour of the stop 232 and the sleeve have a relatively large mating area.

[0066] Under these conditions, the size of the notch 231 depends essentially on the size of the tool itself, and the ideal size of the notch 231 is the one that can cut the smallest possible gap.

[0067] The more notches 231 there are, the easier it is to expand under the same axial force applied to the conical plug 22. However, the more solid parts of the stop 232 are cut off, the more the reliability of the fit between the stop 232 and the sleeve is affected.

[0068] There should be at least two notches 231, and no more than eight, preferably an even number. They are paired up, and the two notches 231 inside are symmetrical about a given midsection.

[0069] Since a reliable engagement needs to be formed between the sleeve and the stop 232, the sleeve needs to be able to form a reliable engagement before it reaches the shoulder at the transition point between the stop 232 and the pin body 233. Therefore, the length of the sleeve is required to be shorter than the length of the stop, with the shorter portion being 0.3~3.0mm.

[0070] The aforementioned short portion is a design margin. Due to manufacturing errors, especially in applications like roller can ears where precision requirements are not high, 0.3mm can be used in small-sized roller can ears, while 3.0mm is used in medium and large-sized roller can ears. In other words, the short portion is positively correlated with the model and specifications of the roller can ear. That is, a larger specification requires a larger short portion, and otherwise a smaller short portion is used.

[0071] The aforementioned range for the shorter portion can still be considered as an applicable range for the same type of roller can ear.

[0072] To improve the reliability of the pin assembly 2 within the pin pair, the sleeve bore of the sleeve portion is a tapered bore, with the larger end of the tapered bore on the cover side, thus allowing for... Figure 4 The cross-sectional shape of the end cap 21 shown is that the cross-sectional shape of the tapered hole is dovetail-shaped. Based on the expansion of the stop 232, it fits with the tapered hole with a dovetail-shaped cross-section to form a reliable profile connection structure.

[0073] Furthermore, the diameter of the large end of the tapered hole is 2.0~2.5mm larger than the diameter of the small end, and the diameter difference between the large and small ends of the tapered hole limits the maximum bulging dimension of the stop 232.

[0074] The outer contour of the sleeve part is cylindrical, which is used to form a shaft hole cooperation with the sleeve hole of the sleeve 31 in the Figure 3 In contrast, the inner contour of the sleeve part is a tapered hole, the small end of which is at the outer end, and the size thereof only needs to meet the requirement of the stopper 232 passing in, and thus the size thereof should be as small as possible. Correspondingly, the diameter of the small end of the tapered hole is 0.1-0.3 mm larger than the diameter of the stopper.

[0075] The corresponding structure also includes that the diameter of the small end of the tapered plug 22 is smaller than the diameter of the hole of the tapered blind hole 234, and the diameter of the large end of the tapered plug 22 is 2.0-2.5 mm larger than the diameter of the hole of the tapered blind hole 234; and the length of the tapered plug 22 is smaller than the depth of the tapered blind hole 234, so as to ensure that the tapered plug 22 can be fully inserted into the tapered blind hole 234.

[0076] Since the pin shaft 23 and the end cover 21 are generally made of Q235, 45 steel or other metals, the elastic modulus thereof is relatively large, and in order to reduce the difficulty in assembly, a secondary opening is arranged on the sleeve part, the secondary opening radially penetrates the sleeve part, and extends from the other end of the sleeve part to the end where the cover body is located, so that when the stopper 232 is expanded, the resistance is relatively small.

[0077] Figure 1 In the upper bracket 1 and the lower bracket 1 in the

[0078] The lower bracket 1 is arranged in the Figure 2 The exemplified structure includes a bottom plate 11, the bottom plate 11 is provided with bolt holes for the installation of the roller cage on, for example, the cage. The bottom plate 11 is provided with two vertical plates 12, which are arranged in parallel to determine the length of the shaft sleeve 16.

[0079] The shaft sleeve 16 generally needs to be inlaid with, for example, a copper sleeve to improve the wear resistance of the shaft sleeve 16, so as to improve the service life of the pin shaft pair.

[0080] The wear-resistant sleeve 14 is provided with a sealing ring 13 at both ends to prevent dust, moisture and the like from entering the pin shaft pair.

[0081] The pin shaft pair as a whole belongs to a cylindrical hinge, and in Figure 1 The exemplified structure is constructed in a sliding bearing style.

[0082] The upper bracket 1 is a swing arm in the roller cage, which can be a column or an L-shaped structure, and the roller shaft sleeve 35 is arranged at the corner of the L-shaped structure. For the column, the roller shaft sleeve 35 is arranged at the upper end.

[0083] A bushing 31 is provided at each end of the upper bracket 1 at the location of the end cap 21, which is normally completely accommodated in the bushing hole 32 of the bushing 31 in the pin shaft pair.

[0084] In some embodiments, the end cap 21 and the bushing 31 are in clearance fit, and the end cap 21 and the bushing 31 are in interference fit based on the expansion of the collar 232.

[0085] The rest of the application of the pin shaft assembly 2 to the rest of the roller cage, for example, belongs to the prior art, and will not be described here.

Claims

1. A pin assembly, characterized in that, include: A pin includes a pin body and stops located at both ends of the pin body and integrally formed with the pin body to form a stepped shaft. The diameter of the stops is smaller than the diameter of the pin body. The end faces of both ends of the pin have tapered blind holes coaxial with the pin. The side walls of the tapered blind holes have at least two notches that radially penetrate the side walls and extend from the end face to the other end. A tapered plug that mates with a tapered blind hole; An end cap includes a sleeve portion and a cover body that seals one end of the sleeve portion, wherein the sleeve portion is fitted onto the outer cylindrical surface of the stop, and the cover body is used to press against the conical plug to press the conical plug into the conical blind hole, causing the stop to expand and form an interference connection or a locking mechanism with the sleeve body. Correspondingly, the end cap is used for axial positioning after the pin body is inserted into the corresponding pin hole; The length of the sleeve is shorter than the length of the stop, with the shorter portion being 0.3~3.0mm; The sleeve has a secondary notch that extends radially through the sleeve and extends from the other end of the sleeve toward the end where the cover is located.

2. The pin assembly according to claim 1, characterized in that, The depth of the tapered blind hole is greater than the stop length, and the excess part is 0.30 to 0.35 times the stop length.

3. The pin assembly according to claim 1 or 2, characterized in that, The notches are four, six, or eight in number, arranged in a uniform ring around the axis of the conical blind hole.

4. The pin assembly according to claim 1, characterized in that, The sleeve hole of the sleeve part is a tapered hole, and the larger end of the tapered hole is on the side of the cover body; The diameter of the large end of the tapered hole is 2.0~2.5mm larger than the diameter of the small end; The outer contour of the sleeve is cylindrical; Correspondingly, the small end diameter of the conical plug is smaller than the diameter of the conical blind hole opening, and the large end diameter of the conical plug is 2.0~2.5mm larger than the diameter of the conical blind hole opening; and the length of the conical plug is smaller than the depth of the conical blind hole.

5. The pin assembly according to claim 4, characterized in that, The small end diameter of the tapered hole is 0.1~0.3mm larger than the diameter of the stop.

6. A pin pair, characterized in that, include: The first bracket provides the bushing; The second bracket provides a bushing at each end of the bushing; The pin assembly according to any one of claims 1 to 5, wherein the pin body in the pin assembly cooperates with the bushing to form a rotating pair, and the end cap of the pin assembly is located inside the bushing for axial positioning of the pin body within the bushing.

7. The pin pair according to claim 6, characterized in that, Before the end cap is fitted with a stop, the end cap and bushing have a clearance fit. After the end cap is fitted with a stop, the end cap and bushing form an interference fit due to the expansion of the stop.

8. A roller can ear, comprising a lower support, an upper support hinged to the lower support via a first pin assembly, a roller assembly mounted on the upper end of the upper support, and a buffer hinged at one end to the upper part of the upper support via a second pin assembly, the other end of the buffer being hinged to the lower support via a third pin assembly, characterized in that, At least the first pin assembly adopts the pin assembly described in any one of claims 1 to 5.

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