CN110985522A

CN110985522A - Self-lubricating shaft and working machine

Info

Publication number: CN110985522A
Application number: CN201911407882.2A
Authority: CN
Inventors: 谷云辉; 丁泽华; 毛成
Original assignee: Hunan Sany Intelligent Control Equipment Co Ltd
Current assignee: Hunan Sany Intelligent Control Equipment Co Ltd; Sany Automobile Manufacturing Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-10
Anticipated expiration: 2039-12-31
Also published as: CN110985522B; WO2021135328A1

Abstract

The embodiment of the invention provides a self-lubricating shaft and an operating machine, and relates to the field of engineering machinery. The self-lubricating shaft comprises a shaft body with an inner cavity and a piston movably arranged in the inner cavity of the shaft body, the inner cavity of the shaft body extends along the axial direction of the shaft body, one side of the piston is provided with an oil storage cavity which is used for storing a lubricating agent, the shaft body is provided with an oil outlet channel, one end of the oil outlet channel is communicated with the oil storage cavity, and the other end of the oil outlet channel extends to the outer peripheral surface of the shaft body; the piston is connected with the shaft body through an elastic member, and the elastic member is used for applying acting force to the piston to compress the oil storage cavity. Therefore, the self-lubricating shaft can continuously and spontaneously extrude the lubricant stored in the oil storage cavity of the shaft body to the outer surface of the shaft body so as to achieve a lubricating effect, avoid frequent manual lubricant supplement, and ensure that the lubricant on the outer surface of the shaft body is full under the active extrusion of the elastic part, so that the lubricating effect is good. The work machine of the present application is mounted with the self-lubricating shaft described above.

Description

Self-lubricating shaft and working machine

Technical Field

The invention relates to the field of engineering machinery, in particular to a self-lubricating shaft and an operating machine.

Background

The concrete pump truck has the advantages that the concrete pump truck and other operation machines are widely applied to construction of modern engineering construction sites, the conveying pipe of the concrete pump truck is arranged on the arm support consisting of the multiple sections of arms and can rotate, unfold and fold along with the arm support, and each section of arm support is connected through a special pin shaft. Along with the increase of the rotation times of the arm support, abrasion can occur between the pin shaft and the arm support, and accidents can occur due to abnormal motion of the arm support seriously. Therefore, a grease nipple is generally arranged on the pin shaft of the arm support, and a user can regularly inject grease into the grease nipple to reduce the abrasion between the arm support and the pin shaft. However, if the user does not inject oil in time, the arm support pin shaft is seriously abraded due to the fact that lubrication is not performed in time. Therefore, the existing pin shaft has poor lubricating effect.

Disclosure of Invention

The object of the present invention consists in providing a self-lubricating shaft which has a better lubricating effect. The invention also aims to provide a working machine provided with the self-lubricating shaft.

Embodiments of the invention may be implemented as follows:

in a first aspect, an embodiment of the present application provides a self-lubricating shaft, including a shaft body having an inner cavity and a piston movably disposed in the inner cavity of the shaft body, wherein the inner cavity of the shaft body extends along an axial direction of the shaft body, one side of the piston is an oil storage cavity, the oil storage cavity is used for storing a lubricant, the shaft body is provided with an oil outlet channel, one end of the oil outlet channel is communicated with the oil storage cavity, and the other end of the oil outlet channel extends to an outer peripheral surface of the shaft body; the piston is connected with the shaft body through an elastic element, and the elastic element is used for applying acting force to the piston to compress the oil storage cavity.

In an optional embodiment of the application, an oil filling port is arranged on an end surface of the shaft body, and the oil filling port is communicated with the oil storage cavity through an oil filling channel; the oil injection channel is embedded between the outer circumferential surface and the inner circumferential surface of the shaft body.

In an alternative embodiment of the present application, an oil cup is disposed at the oil filling port.

In an alternative embodiment of the present application, a side of the piston facing away from the oil storage chamber and a part of the inner wall of the shaft body form a non-oil storage chamber;

the elastic part is a compression spring capable of providing pushing force and is positioned in the non-oil storage cavity, or the elastic part is an extension spring capable of providing pulling force and is positioned in the oil storage cavity;

the non-oil storage cavity is communicated with the outside of the shaft body through an air hole.

In an alternative embodiment of the present application, two pistons are disposed in the inner cavity of the shaft body, the oil storage cavity is formed between the two pistons, and the two elastic members are respectively connected to the two pistons and provide forces for the two pistons to move in opposite directions.

In an optional embodiment of the present application, two pistons are disposed in an inner cavity of the shaft body, the elastic member is disposed between the two pistons, and two ends of the elastic member are respectively connected to the two pistons and provide a force for the two pistons to move back to back.

In an alternative embodiment of the present application, two inner cavities are provided in the shaft body, the two inner cavities are spaced in the axial direction of the shaft body and are separated by a baffle, and one piston is provided in each of the two inner cavities to separate the inner cavity into the oil storage cavity and the non-oil storage cavity; the two pistons and the baffle are connected with one elastic piece respectively, and the two oil storage cavities are communicated with the inside and the outside through one oil outlet channel respectively.

In an alternative embodiment of the present application, the piston includes a first piston and a second piston, the elastic member includes a first elastic member and a second elastic member, a first baffle and a second baffle are disposed in an inner cavity of the shaft, the first piston is connected to the first baffle through the first elastic member, the second piston is connected to the second baffle through the second elastic member, and the first elastic member and the second elastic member respectively provide a force to the first piston and the second piston, the force being away from each other; the first baffle is located between the second baffle and the second piston, the first elastic piece penetrates through a through hole in the second baffle, the second baffle is located between the first baffle and the first piston, and the second elastic piece penetrates through a through hole in the first baffle.

In an alternative embodiment of the present application, at least one end portion of the shaft body is provided with a transparent portion so as to observe the inside of the shaft body;

the tip of axis body is provided with and is used for the shutoff the end cover of the one end of inner chamber, be provided with the screw on the end cover, transparent portion is the ya keli pin, ya keli pin threaded connection in the screw.

In a second aspect, the present application provides a work machine including the self-lubricating shaft of the first aspect.

The beneficial effects of the embodiment of the invention include, for example:

the self-lubricating shaft comprises a shaft body with an inner cavity and a piston movably arranged in the inner cavity of the shaft body, wherein the inner cavity of the shaft body extends along the axial direction of the shaft body, one side of the piston is provided with an oil storage cavity which is used for storing a lubricant, the shaft body is provided with an oil outlet channel, one end of the oil outlet channel is communicated with the oil storage cavity, and the other end of the oil outlet channel extends to the peripheral surface of the shaft body; the piston is connected with the shaft body through an elastic member, and the elastic member is used for applying acting force to the piston to compress the oil storage cavity. Therefore, the self-lubricating shaft can continuously and spontaneously extrude the lubricant stored in the oil storage cavity of the shaft body to the outer surface of the shaft body so as to achieve a lubricating effect, avoid frequent manual lubricant supplement, and ensure that the lubricant on the outer surface of the shaft body is full under the active extrusion of the elastic part, so that the lubricating effect is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an exploded view of a self-lubricating shaft according to a first embodiment of the present application;

FIG. 2 is a cross-sectional view of a self-lubricating shaft according to a first embodiment of the present application;

FIG. 3 is a schematic illustration of a oiling channel of a self-lubricating shaft provided in accordance with a first embodiment of the present application;

FIG. 4 is a cross-sectional view of a self-lubricating shaft provided in accordance with a second embodiment of the present application;

FIG. 5 is a cross-sectional view of a self-lubricating shaft according to a third embodiment of the present application;

FIG. 6 is a cross-sectional view of a self-lubricating shaft according to a fourth embodiment of the present application;

FIG. 7 is a cross-sectional view of a self-lubricating shaft provided in accordance with a fifth embodiment of the present application;

fig. 8 is a cross-sectional view of a self-lubricating shaft according to a sixth embodiment of the present application.

Icon: 010-self-lubricating shaft; 100-shaft body; 101-an oil outlet channel; 102-a fill port; 103-oil cup; 104-oil injection channel; 105-an oil reservoir; 106-non-reservoir chamber; 107-air holes; 110-a first end cap; 112-transparent portion; 120-a second end cap; 130-a baffle; 132-a first baffle; 134-a second baffle; 200-a piston; 201-a first piston; 202-a second piston; 210-an elastic member; 211-a first elastic member; 212-a second resilient member; 220-sealing ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the present invention is used, the description is merely for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Fig. 1 is an exploded view of a self-lubricating shaft 010 provided in a first embodiment of the present application; fig. 2 is a cross-sectional view of a self-lubricating shaft 010 according to a first embodiment of the present application; fig. 3 is a schematic view of the oil filling passage 104 of the self-lubricating shaft 010 according to the first embodiment of the present application. Referring to fig. 1 to 3, the present embodiment provides a self-lubricating shaft 010, including a shaft body 100 having an inner cavity and a piston 200 movably disposed in the inner cavity of the shaft body 100, wherein the inner cavity of the shaft body 100 extends along an axial direction of the shaft body 100, the inner cavity of the shaft body 100 is divided into an oil storage cavity 105 and a non-oil storage cavity 106 by the piston 200, the oil storage cavity 105 is used for storing a lubricant, the shaft body 100 is provided with an oil outlet channel 101, one end of the oil outlet channel 101 is communicated with the oil storage cavity 105, and the other end extends to an outer peripheral surface of the shaft body; the piston 200 is connected to the shaft body 100 through an elastic member 210, and the piston 200 can move in an axial direction with respect to the shaft body 100 under the force of the elastic member 210 to compress the oil storage chamber 105. It can be understood that the piston 200 can press the lubricant (such as engine oil) in the oil storage cavity 105 under the action of the elastic member 210, so that the lubricant flows from the oil outlet channel 101 to the outer side surface of the shaft body 100, and the lubricant can lubricate between the outer side surface of the shaft body 100 and an external structure (such as an arm support). The lubricant in the self-lubricating shaft 010 can be continuously supplied to the outer peripheral surface under the action of the piston 200 and the elastic member 210, so that the situation that an operator frequently and manually adds the lubricant to the shaft surface is avoided, the elastic member 210 of the self-lubricating shaft 010 provides certain pre-pressure, and the lubricant has power which is extruded to the outer peripheral surface of the shaft body 100, so that the lubricant on the outer surface of the self-lubricating shaft 010 can be ensured to be full, and the lubricating effect is good.

In the embodiment shown in fig. 1 to 3, two ends of the shaft body 100 are sealed by end caps, namely a first end cap 110 and a second end cap 120. The connection between the end cap and the shaft body 100 may be a screw connection, a welding connection, or a connection by a fastener, and ensures sealing performance.

In an alternative embodiment, at least one end of the shaft body 100 is provided with a transparent part 112 so as to observe the inside of the shaft body 100. In the embodiment of fig. 1, optionally, a screw hole is formed on the first end cap 110, and the transparent portion 112 is an acrylic pin, and the acrylic pin is screwed into the screw hole. An operator can observe the condition of the inner cavity of the shaft body 100, such as the position of the piston 200, the remaining amount of the lubricant, and the like, through the acrylic pin. Of course, the transparent portion 112 could be replaced by other materials, such as a glass window.

In the present embodiment, a filler port 102 is provided on an end surface of the shaft body 100, and the filler port 102 communicates with a reservoir chamber 105 through a filler passage 104. Further, an oil cup 103 is arranged at the oil filling port 102. As shown in fig. 3, the oil filling passage 104 is embedded between the outer circumferential surface and the inner circumferential surface of the shaft body 100, extends to a position corresponding to the oil reservoir 105 in the axial direction, and then extends radially inward to communicate with the oil reservoir 105. In this embodiment, the oil fill port 102 is located at the first end of the first end cap 110, and in other embodiments, the oil fill port 102 may be located at the second end of the second end cap 120.

As shown in fig. 2, in the present application, the elastic member 210 is a compression spring capable of providing a pushing force, and the elastic member 210 is located in the non-oil storage chamber 106. One end of the elastic member 210 is connected to the piston 200, and the other end is connected to the second end cap 120, and both ends of the elastic member 210 may be connected to the corresponding components by welding. In order to ensure the sealing performance of the peripheral side of the piston 200, the piston 200 is provided with a sealing ring 220.

The working principle of the self-lubricating shaft 010 provided by the embodiment is as follows:

① oiling stage, after assembling the shaft body 100 with the external structure (such as the arm rest), opening the oil cup 103, and injecting lubricant into the oil storage cavity 105 inside the shaft body 100 through the oiling port 102, the pressure of the lubricant will push the piston 200 and the sealing ring 220 to move to the right (based on the orientation of fig. 2), so that the compression spring as the elastic member 210 is compressed, the compression spring stores the pressure, when the lubricant is injected with the same volume as the oil cavity when the spring is compressed, stopping oiling, and installing the screwed oil cup 103.

② during the lubrication stage, the pressure stored in the elastic element 210 is slowly released under the action of the pressure release at the outlet of the oil outlet channel 101, and pushes the piston 200 and the sealing ring 220 to move leftwards (in the orientation of fig. 2), so that the compression spring is released, and the lubricant injected into the oil storage cavity 105 flows into the matching part of the shaft body 100 and the external structure through the oil outlet channel 101, thereby achieving a continuous lubrication effect.

③ observing step that the user can observe the oil chamber 105 in the shaft body 100 through the transparent part 112 (i.e., the acrylic pin of the present embodiment) of the first end cap 110, when the lubricant is filled up, the color of the oil chamber becomes yellowish, and as the compression spring pushes the piston 200 and the sealing ring 220 to gradually move to the left, the color of the acrylic pin will gradually increase to the color of the piston 200 (the piston 200 is coated with a dark color different from the yellowish).

The self-lubricating shaft 010 provided by the embodiment has the beneficial effects that:

1. after oil is injected, the outlet of the oil outlet channel 101 on the shaft body 100 is continuously injected with the lubricant for the contact position of the shaft body 100 and an external assembly structure by the pre-tightening pressure of the elastic part 210, so that the scheme has high reliability and is not easy to lose efficacy.

2. When the self-lubricating oil cavity is used by a user, only after the self-lubricating shaft 010 is installed, quantitative lubricant is injected through the oil injection port 102, the injection amount is equal to the volume of the oil cavity when the spring is tightly pressed, and the operation is convenient and reliable.

3. Self-lubricating axle 010 has avoided the untimely wearing and tearing scheduling problem of axis body 100 that causes of lubrication through the mode of self-lubricating, and life increases.

4. Through the self-lubricating mode, inject emollient in succession, make the axis body 100 outside and the wearing and tearing condition of exterior structure assembly position alleviate, avoided the problem of abnormal sound.

Fig. 4 is a cross-sectional view of a self-lubricating shaft 010 according to a second embodiment of the present application. Referring to fig. 4, the self-lubricating shaft 010 of this embodiment is similar to the embodiment shown in fig. 2, but differs therefrom in that the elastic member 210 is a tension spring capable of providing a tensile force, and the elastic member 210 is located in the oil storage chamber 105. With the orientation shown in fig. 4, the region between the second end cap 120 and the piston 200 is the reservoir chamber 105, and the region between the first end cap 110 and the piston 200 is the non-reservoir chamber 106. The oil gallery 104 should be connected to the oil reservoir 105 on the right side of the piston 200.

Fig. 5 is a sectional view of a self-lubricating shaft 010 according to a third embodiment of the present application. Referring to fig. 5, in the present embodiment, two pistons 200 are disposed in the inner cavity of the shaft body 100, and an oil storage cavity 105 is formed between the two pistons 200. The two elastic members 210 are respectively connected to the two pistons 200 and provide a force for the two pistons 200 to move toward each other. The oil outlet passage 101 is located at a position between the two pistons 200. In the embodiment, the elastic members 210 are compression springs, and the two elastic members 210 are located in the non-oil-storage chamber 106 and abut against the end caps at the two ends of the shaft body 100. With the structure of the embodiment of fig. 5, effects similar to those of the embodiment of fig. 2 can be achieved. In this embodiment, of course, the oil filling passage 104 (not shown) should be communicated to a position between the two pistons 200 so that the lubricant can be filled into the oil reservoir 105.

Fig. 6 is a cross-sectional view of a self-lubricating shaft 010 according to a fourth embodiment of the present application. Referring to fig. 6, in the present embodiment, the shaft body 100 has two inner cavities spaced apart from each other in the axial direction of the shaft body 100 by a baffle 130, two pistons 200 are respectively disposed in the two inner cavities, and the two pistons 200 respectively divide the inner cavity into an oil storage cavity 105 and a non-oil storage cavity 106. An elastic member 210 is connected between the two pistons 200 and the baffle 130, in this embodiment, the elastic member 210 is a compression spring, the region between the pistons 200 and the baffle 130 is the non-oil-storage chamber 106, and the region between the pistons 200 and the end caps is the oil-storage chamber 105. The two oil storage chambers 105 are communicated with the inside and the outside through one oil outlet passage 101, respectively.

In the embodiment of fig. 6, two non-oil storage chambers 106 communicate with the outside of the shaft body 100 through air holes 107. It should be appreciated that the vent 107 can balance the air pressure outside the non-oil-storage chamber 106 and the shaft body 100, so as to avoid that the non-oil-storage chamber 106 generates negative pressure and the piston 200 cannot be pushed to the oil-storage chamber 105 continuously. In other embodiments of the present application, the non-oil-storage chamber 106 may be additionally provided with an air hole 107 communicating with the outside of the shaft body 100.

It should be understood that the oil filling channel 104 in this embodiment should branch off into two branches, corresponding to two outlets, respectively capable of introducing lubricant into the two oil storage chambers 105.

Fig. 7 is a cross-sectional view of a self-lubricating shaft 010 according to a fifth embodiment of the present application. Referring to fig. 7, the self-lubricating shaft 010 is similar to the self-lubricating shaft 010 of the embodiment of fig. 5, except that an elastic member 210 is used, and the elastic member 210 is a tension spring and is connected between two pistons 200. Therefore, an oil storage cavity 105 is formed between the baffle 130 and the piston 200, a non-oil storage cavity 106 is formed between the piston 200 and the end cover, and the elastic element 210 is located in the oil storage cavity 105. The effect achieved is similar to the self-lubricating shaft 010 of the embodiment of fig. 5.

Fig. 8 is a cross-sectional view of a self-lubricating shaft according to a sixth embodiment of the present application. Referring to fig. 8, the self-lubricating shaft 010 of the present embodiment is similar to the self-lubricating shaft of the embodiment of fig. 6, the piston includes a first piston 201 and a second piston 202, and the elastic member includes a first elastic member 211 and a second elastic member 212. The difference is that the inner cavity of the shaft body 100 is provided with a first baffle 132 and a second baffle 134, the first piston 201 is connected to the first baffle 132 through a first elastic member 211, and the second piston 202 is connected to the second baffle 134 through a second elastic member 212. In this embodiment, the first elastic member 211 and the second elastic member 212 are both compression springs, and provide a force to the first piston 201 and the second piston 202, respectively, away from each other. The first baffle 132 is positioned between the second baffle 134 and the second piston 202, the first elastic member 211 passes through the through hole of the second baffle 134, the second baffle 134 is positioned between the first baffle 132 and the first piston 201, and the second elastic member 212 passes through the through hole of the first baffle 132. Specifically, the number of the first elastic members 211 may be two, and the two elastic members are arranged at intervals in the vertical direction in the drawing; the second elastic members 212 may be two in number, and are arranged in a horizontal direction in the drawing (only one is shown).

As shown in fig. 8, the left side of the first piston 201 and the right side of the second piston 202 form the oil reservoir chamber 105, and the non-oil reservoir chamber 106 is formed therebetween. It will be appreciated that the compression spring, when compressed to an extreme position, has a minimum compressed length, wherein the portion that cannot be compressed further cannot be taken as the effective stroke zone of the spring. Therefore, compared to the two elastic members 210 of the self-lubricating shaft 010 in the embodiment of fig. 6, which are not overlapped at all, in this embodiment, at least a part of the length of the incompressible part of the first elastic member 211 and the second elastic member 212 is overlapped, which means that the inactive stroke sections of the two elastic members are overlapped at least partially, so that the entire self-lubricating shaft 010 can be made to face upward in the axial direction, the active stroke section occupancy ratio is larger, and the lubricant storage rate can be higher. In addition, in the embodiment, since the first baffle 132 and the second baffle 134 have through holes for air to flow through, only one air hole 107 is needed.

The embodiment of the present application further provides a working machine (not shown in the drawings), where the working machine includes at least two sections of arm supports, and the arm supports are connected through the self-lubricating shaft 010 provided in the above embodiment of the present application. Due to the fact that the self-lubricating shaft 010 provided by the embodiment of the application is installed, the arm support connecting part of the working machine has a good lubricating effect.

In summary, the self-lubricating shaft provided by the embodiment of the present application includes a shaft body having an inner cavity and a piston movably disposed in the inner cavity of the shaft body, the inner cavity of the shaft body extends along an axial direction of the shaft body, one side of the piston is an oil storage cavity, the oil storage cavity is used for storing a lubricant, the shaft body is provided with an oil outlet channel, one end of the oil outlet channel is communicated with the oil storage cavity, and the other end of the oil outlet channel extends to an outer peripheral surface of the shaft body; the piston is connected with the shaft body through an elastic member, and the elastic member is used for applying acting force to the piston to compress the oil storage cavity. Therefore, the self-lubricating shaft can continuously and spontaneously extrude the lubricant stored in the oil storage cavity of the shaft body to the outer surface of the shaft body so as to achieve a lubricating effect, avoid frequent manual lubricant supplement, and ensure that the lubricant on the outer surface of the shaft body is full under the active extrusion of the elastic part, so that the lubricating effect is good. The working machine provided by the embodiment of the application is provided with the self-lubricating shaft.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The self-lubricating shaft is characterized by comprising a shaft body (100) with an inner cavity and a piston (200) movably arranged in the inner cavity of the shaft body (100), wherein the inner cavity of the shaft body (100) extends along the axial direction of the shaft body (100), one side of the piston (200) is an oil storage cavity (105), the oil storage cavity (105) is used for storing lubricant, an oil outlet channel (101) is arranged on the shaft body (100), one end of the oil outlet channel (101) is communicated with the oil storage cavity (105), and the other end of the oil outlet channel extends to the outer peripheral surface of the shaft body (100); the piston (200) is connected with the shaft body (100) through an elastic member (210), and the elastic member (210) is used for applying acting force to the piston (200) to compress the oil storage cavity (105).

2. The self-lubricating shaft according to claim 1, wherein an oil filling port (102) is provided on an end surface of the shaft body (100), and the oil filling port (102) is communicated with the oil storage chamber (105) through an oil filling passage (104); the oil filling passage (104) is embedded between the outer circumferential surface and the inner circumferential surface of the shaft body (100).

3. Self-lubricating shaft according to claim 2, characterised in that an oil cup (103) is provided at the oil filling opening (102).

4. A self-lubricating shaft according to claim 1, characterised in that the side of the piston (200) facing away from the oil reservoir (105) forms a non-oil reservoir (106) with part of the inner wall of the shaft body (100);

the elastic member (210) is a compression spring capable of providing a pushing force, and the elastic member (210) is positioned in the non-oil storage cavity (106), or the elastic member (210) is an extension spring capable of providing a pulling force, and the elastic member (210) is positioned in the oil storage cavity (105);

the non-oil storage cavity (106) is communicated with the outside of the shaft body (100) through an air hole (107).

5. A self-lubricating shaft according to claim 1, wherein the shaft body (100) has two pistons (200) disposed in an inner cavity thereof, the two pistons (200) define the oil storage chamber (105) therebetween, and the two elastic members (210) are respectively connected to the two pistons (200) and provide forces for the two pistons (200) to move toward each other.

6. The self-lubricating shaft according to claim 1, wherein two pistons (200) are arranged in the inner cavity of the shaft body (100), the elastic member (210) is arranged between the two pistons (200), and two ends of the elastic member (210) are respectively connected to the two pistons (200) and provide a force for the two pistons (200) to move back and forth.

7. A self-lubricating shaft according to claim 1, characterised in that the shaft body (100) has two said internal chambers spaced axially of the shaft body (100) and separated by a barrier (130), each of the two said internal chambers having a said piston (200) disposed therein to divide the internal chamber into an oil storage chamber (105) and a non-oil storage chamber (106); the elastic piece (210) is connected between the two pistons (200) and the baffle plate (130), and the two oil storage cavities (105) are communicated with the inside and the outside through the oil outlet channel (101).

8. The self-lubricating shaft according to claim 1, wherein the piston (200) comprises a first piston (201) and a second piston (202), the elastic member (210) comprises a first elastic member (211) and a second elastic member (212), the inner cavity of the shaft body (100) is provided with a first baffle (132) (130) and a second baffle (134), the first piston (201) is connected to the first baffle (132) through the first elastic member (211), the second piston (202) is connected to the second baffle (134) through the second elastic member (212), and the first elastic member (211) and the second elastic member (212) provide a force to the first piston (201) and the second piston (202) away from each other, respectively; the first baffle plate (132) is located between the second baffle plate (134) and the second piston (202), the first elastic piece (211) penetrates through a through hole in the second baffle plate (134), the second baffle plate (134) is located between the first baffle plate (132) and the first piston (201), and the second elastic piece (212) penetrates through a through hole in the first baffle plate (132).

9. A self-lubricating shaft according to claim 1, characterised in that at least one end of the shaft body (100) is provided with a transparent portion for viewing the inside of the shaft body (100);

the tip of axis body (100) is provided with and is used for the shutoff the end cover of the one end of inner chamber, be provided with the screw on the end cover, transparent portion is the ya keli pin, ya keli pin threaded connection in the screw.

10. A working machine, characterized in that it comprises a self-lubricating shaft (010) according to any one of claims 1-9.