Pin shaft

Abstract

The utility model discloses a pin shaft in the technical field of track instruments, and aims to solve the problem that in the prior art, a pin shaft and a pin hole in a track instrument work abnormally due to lack of lubrication after being used for a long time. When the pin roll rolls in a pin hole wall and the extrusion force of the pin hole wall on the outer wall of the pin roll is small, an elastic piece mainly controls a first sealing switch piece, the first sealing switch piece seals a medium outlet piece under the action of the elastic force of the elastic piece, and a lubricating mechanism between the outer wall and the pin hole wall is prevented from being kept at a reasonable level; when the friction force between the outer wall and the pin hole wall is increased until the extrusion force borne by the first sealing switch piece is enough to overcome the elastic force of the elastic piece, the lubricating medium can be dispersed into the space between the outer wall and the pin hole wall from the gap until the space between the outer wall and the pin hole wall is lowered to a certain level; and self-supplement of the lubricating medium is realized, so that the service life of the pin shaft is prolonged.

Description

Technical Field

[0001] This utility model relates to a pin shaft and belongs to the field of tracked machinery technology. Background Technology

[0002] In tracked machinery, such as hydraulic excavators, the pins and pin holes come pre-lubricated with lubricant from the factory, and no additional lubricant is needed for subsequent maintenance and repair.

[0003] During use, the pin shaft is constantly in contact with and wears down the track plate pin holes. This can cause problems, such as: after the main unit has been working for a period of time, the wear of the pin holes increases, causing the distance between the two pin holes of the track plate to increase and become mismatched with the tooth pitch of the drive wheel, resulting in tooth skipping and ultimately damaging the track plate and drive wheel, reducing their service life.

[0004] Therefore, we can conclude that the lack of lubrication in the pins and pin holes of tracked machinery after prolonged use can lead to malfunctions. Utility Model Content

[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide a pin with a self-replenishing lubricating medium to improve service life.

[0006] To achieve the above objectives, this application employs the following technical solution:

[0007] This application provides a pin,

[0008] The outer wall of the pin is provided with a countersunk hole that communicates with the storage cavity. The countersunk hole is provided with a medium outlet, a first sealing switch and an elastic element connected to the first sealing switch.

[0009] The elastic force of the elastic element drives the first sealing switch to block the medium outlet; when the pin hole wall squeezes the first sealing switch, a gap is generated between the first sealing switch and the medium outlet, and the lubricating medium in the storage cavity flows into the pin hole wall through the gap.

[0010] In some embodiments of this application, the elastic force of the elastic element also drives the first sealing switch element to form a protrusion structure on the outer wall that can be squeezed by the pin hole wall.

[0011] In some embodiments of this application, the first sealing switch is made of an elastic material.

[0012] In some embodiments of this application, the first sealing switch is a rolling element capable of rolling along the pin hole wall or a sliding element capable of sliding along the pin hole wall.

[0013] In some embodiments of this application, the first sealing switch is a sealing ball; the medium outlet is provided with an outlet hole facing the pin hole wall, and the inner diameter of the outlet hole is smaller than the maximum outer diameter of the first sealing switch; when the first sealing switch rolls along the pin hole wall, the lubricating medium is spread to the pin hole wall as the first sealing switch rolls.

[0014] In some embodiments of this application, the medium outlet component is interference-fitted with the countersunk hole.

[0015] In some embodiments of this application, the elastic element is a spring, with one end of the spring abutting against the first sealing switch element and the other end abutting against the bottom wall of the countersunk hole.

[0016] In some embodiments of this application, the storage cavity is located inside the pin, the storage cavity is a cylindrical cavity and its central axis is aligned with the rotation axis of the pin; a first channel is arranged radially along the pin, and the two ends of the first channel are respectively connected to the storage cavity and the countersunk hole.

[0017] In some embodiments of this application, the opening of the storage cavity on the pin surface is sealed by a second elastic seal, the second elastic seal having a pinhole for external injection of lubricating medium into the storage cavity.

[0018] In some embodiments of this application, the opening of the storage cavity on the pin surface is located on the end face of the pin, and the pin eye is aligned with the axis of rotation of the pin.

[0019] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0020] When the pin provided in this application rolls within the pin hole wall, and the pressure exerted by the pin hole wall on the outer wall of the pin is relatively small, the elastic element plays a major control role on the first sealing switch. Under the action of the elastic force of the elastic element, the first sealing switch seals the medium outlet, preventing the lubrication mechanism between the outer wall and the pin hole wall from reaching a reasonable level. When the friction between the outer wall and the pin hole wall increases to the point that the pressure exerted on the first sealing switch is sufficient to overcome the elastic force of the elastic element, the lubricating medium can be dispersed from the gap into the space between the outer wall and the pin hole wall until it drops to a certain level. This achieves self-replenishment of the lubricating medium, thereby improving the service life of the pin. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the pin structure provided in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Cross-sectional view and detailed view of the axis of rotation;

[0024] Figure 3 This is a schematic diagram showing the connection relationship between the pin and the track plate;

[0025] In the diagram: 1. Storage cavity; 2. First channel; 3. Elastic element; 4. First sealing switch element; 5. Medium outlet element; 6. Countersunk hole; 7. Second elastic seal element; 7.1. Pinhole; 8. Outer wall;

[0026] 10. Pin;

[0027] 20. Track plates. Detailed Implementation

[0028] The technical solutions of this application / the embodiments thereof will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application / the embodiments thereof, and not all embodiments thereof. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application / the application thereof or its application or use. Example 1

[0029] This embodiment provides a pin to solve the problem of excessive wear of the pin and pin hole during the use of tracked equipment due to the lack of lubrication medium in the later stage of the process.

[0030] refer to Figures 1 to 3 The pin provided in this embodiment includes,

[0031] The outer wall 8 of the pin 10 is provided with a countersunk hole 6 that communicates with the storage cavity 1. The countersunk hole 6 is provided with a medium outlet 5, a first sealing switch 4 and an elastic element 3 connected to the first sealing switch 4.

[0032] The elastic force of the elastic element 3 drives the first sealing switch element 4 to block the medium outlet element 5; when the pin hole wall squeezes the first sealing switch element 4, a gap is generated between the first sealing switch element 4 and the medium outlet element 5, and the lubricating medium in the storage cavity 1 flows into the pin hole wall through the gap.

[0033] Lubricating medium is pre-stored in storage cavity 1. In one embodiment, during use, the pin 10 rolls in the pin hole wall. When the pressure of the pin hole wall on the outer wall 8 of the pin 10 is small, the elastic element 3 plays a major control role on the first sealing switch 4. Under the action of the elastic force of the elastic element 3, the first sealing switch 4 seals the medium outlet 5, preventing the lubrication mechanism between the outer wall 8 and the pin hole wall from maintaining a reasonable level. When the friction between the outer wall 8 and the pin hole wall increases to the point that the pressure on the first sealing switch 4 is sufficient to overcome the elastic force of the elastic element 3, the lubricating medium can be dispersed from the gap into the space between the outer wall 8 and the pin hole wall until the pressure between the outer wall 8 and the pin hole wall drops to a certain level.

[0034] Figure 3 The connection relationship between pin 10 and track plate 20 is revealed.

[0035] As one embodiment, the correlation mechanism between the increased extrusion pressure on the pin hole wall and the increased friction between the outer wall 8 and the pin hole wall includes at least the following: frictional heat generation or thermal expansion and contraction caused by changes in ambient temperature leads to a decrease in the distance between the outer wall 8 and the pin hole wall; metal debris generated by frictional wear causes jamming, resulting in a slight eccentric rotation of the pin shaft 10; wear on the outer wall 8 causes the first sealing switch 4 to protrude more than the outer wall 8, making it more susceptible to stress concentration from the pin hole wall. Example 2

[0036] This embodiment provides a pin shaft. This embodiment is an optimization based on Embodiment 1 to improve the technical effect and refine the technical solution. For details not described in this embodiment, please refer to Embodiment 1.

[0037] In one embodiment, the elastic force of the elastic element 3 also drives the first sealing switch element 4 to form a protrusion structure on the outer wall 8 that can be squeezed by the pin hole wall. That is, under the action of the elastic force of the elastic element 3, the first sealing switch element 4 seals the medium outlet element 5 as a whole, but a part of it is relatively outside the outer wall 8 and can be subjected to the squeezing force of the pin hole wall. This setting is more sensitive.

[0038] In one embodiment, the first sealing switch 4 is made of an elastic material, such as a rubber component. The elastic material can better seal the contact portion between it and the medium outlet component 5, and if the protruding structure is elastic, it can reduce the wear of the pin hole wall.

[0039] In one embodiment, the first sealing switch 4 is a rolling element capable of rolling along the pin hole wall or a sliding element capable of sliding along the pin hole wall. The rolling and sliding elements can also reduce wear on the pin hole wall. When the first sealing switch 4 is a rolling element, when the gap between the first sealing switch 4 and the medium outlet 5 is open, the lubricating medium located in the countersunk hole 6 can adhere to the surface of the first sealing switch 4. As the first sealing switch 4 rolls, it moves to the outside of the countersunk hole 6, contacts the pin hole wall, and adheres to it, similar to the principle of a ballpoint pen refill. The sliding first sealing switch 4 can be made of graphite, while the rolling first sealing switch 4 can be a small steel ball, a quasi-cylindrical ball, or a rubber ball.

[0040] In one embodiment, the medium outlet 5 can have an outlet hole on one side facing the pin hole wall, and the other side can be fully open to connect with the countersunk hole 6, forming a space inside to accommodate the elastic element 3; the first sealing switch 4 can be a sealing ball, which can be either rigid or elastic, and the inner diameter of the outlet hole is smaller than the maximum outer diameter of the first sealing switch 4. When the first sealing switch 4 rolls along the pin hole wall, the lubricating medium is spread to the pin hole wall along with the rolling of the first sealing switch 4; a sealing ring can also be fitted along the outlet hole to reduce wear.

[0041] In one embodiment, the medium outlet 5 is interference-fitted with the countersunk hole 6. This way, only the countersunk hole 6 needs to be machined on the outer wall 8. After manufacturing the medium outlet 5 with an outer diameter slightly larger than the inner diameter of the countersunk hole 6, the elastic element 3 and the first sealing switch element 4 are assembled inside the medium outlet 5. Then, the medium outlet 5 is pressed into the countersunk hole 6, or the medium outlet 5 is cooled and placed into the countersunk hole 6, thus achieving simple manufacturing.

[0042] In one embodiment, the elastic element 3 is preferably selected with anisotropic compressive properties, so that when the elastic element 3 is compressed, it will not laterally compress the space inside the counterbore 6 and the first sealing switch 4. The elastic element 3 is a spring, with one end of the spring abutting against the first sealing switch 4 and the other end abutting against the bottom wall of the counterbore 6. The elastic deformation of the spring is two-dimensional. When the spring is compressed, almost only axial compression occurs, while the lateral outer diameter remains unchanged. Moreover, the spring is hollow, which facilitates the flow of lubricating medium.

[0043] In one embodiment, the storage cavity 1 is located within the pin 10, and the storage cavity 1 is a cylindrical cavity with its central axis aligned with the rotation axis of the pin 10; a first channel 2 is arranged radially along the pin 10, and the two ends of the first channel 2 are respectively connected to the storage cavity 1 and the countersunk hole 6. The pin 10 is... Figure 1 When the arrow shown rotates, the lubricating medium undergoes centrifugal force due to inertia. (Refer to...) Figure 2 This creates a tendency for the material to flow into the sinkhole 6 along the first channel 2.

[0044] In one embodiment, the opening of the storage cavity 1 on the surface of the pin 10 is sealed by a second elastic seal 7. The second elastic seal 7 has a pinhole 7.1, which is used to inject / extract lubricating medium into the storage cavity 1 from the outside. This satisfies the need for subsequent lubricating medium addition, and prevents leakage at the pinhole 7.1 under the elastic action of the second elastic seal 7.

[0045] In one embodiment, the opening of the storage cavity 1 on the surface of the pin 10 is located on the end face of the pin 10, and the second elastic seal 7 also corresponds to the end face of the pin 10. The pinhole 7.1 is aligned with the axis of rotation of the pin 10. During use, due to the rotation of the pin 10, the distribution probability of the lubricating medium is lower closer to the axis of rotation, and the lubricating medium tends to move away from the axis of rotation and away from the pinhole 7.1, further preventing leakage.

[0046] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not 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. Furthermore, the terms "first," "second," etc., 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "located in," "equipped with," "located in," "installed," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. "Hinged connection" includes "rotational connection."

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pin, characterized in that, The outer wall (8) of the pin (10) is provided with a countersunk hole (6) that communicates with the storage cavity (1). The countersunk hole (6) is provided with a medium outlet (5), a first sealing switch (4) and an elastic element (3) connected to the first sealing switch (4). The elastic force of the elastic element (3) drives the first sealing switch element (4) to block the medium outlet element (5); when the pin hole wall squeezes the first sealing switch element (4), a gap is generated between the first sealing switch element (4) and the medium outlet element (5), and the lubricating medium in the storage cavity (1) flows into the pin hole wall through the gap.

2. The pin according to claim 1, characterized in that, The elastic force of the elastic element (3) also drives the first sealing switch element (4) to form a protrusion structure on the outer wall (8) that can be squeezed by the pin hole wall.

3. The pin according to claim 2, characterized in that, The first sealing switch (4) is made of elastic material.

4. The pin according to claim 2, characterized in that, The first sealing switch (4) is a rolling element that can roll along the pin hole wall or a sliding element that can slide along the pin hole wall.

5. The pin according to claim 4, characterized in that, The first sealing switch (4) is a sealing ball; the medium outlet (5) is provided with an outlet hole facing the pin hole wall, and the inner diameter of the outlet hole is smaller than the maximum outer diameter of the first sealing switch (4); when the first sealing switch (4) rolls along the pin hole wall, the lubricating medium is spread to the pin hole wall along with the rolling of the first sealing switch (4).

6. The pin according to claim 1, characterized in that, The medium outlet component (5) is interference-fitted with the countersunk hole (6).

7. The pin according to claim 1, characterized in that, The elastic element (3) is a spring, with one end of the spring abutting against the first sealing switch element (4) and the other end abutting against the bottom wall of the countersunk hole (6).

8. The pin according to claim 1, characterized in that, The storage cavity (1) is located inside the pin (10). The storage cavity (1) is a cylindrical cavity and its central axis is aligned with the rotation axis of the pin (10). The first channel (2) is arranged radially along the pin (10). The two ends of the first channel (2) are respectively connected to the storage cavity (1) and the countersunk hole (6).

9. The pin according to claim 8, characterized in that, The opening of the storage cavity (1) on the surface of the pin (10) is sealed by a second elastic seal (7), and the second elastic seal (7) has a pinhole (7.1) for external injection of lubricating medium into the storage cavity (1) by injection.

10. The pin according to claim 9, characterized in that, The opening of the storage cavity (1) on the surface of the pin (10) is located on the end face of the pin (10), and the eye (7.1) is aligned with the axis of rotation of the pin (10).

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