Self-lubricating floating shaft sleeve

Abstract

The invention relates to a self-lubricating floating shaft sleeve which comprises a shaft sleeve base body, a first end face of the shaft sleeve base body is used for making contact with a gear, and two shaft holes are formed in the first end face; shafts of the gears are mounted in the corresponding shaft holes through the bushes; an oil collecting groove is formed in the first end face and located on the periphery of each shaft hole, and each shaft hole is provided with an oil discharging hole communicated with the corresponding oil collecting groove. An oil guide groove is formed in the inner wall of each lining, and an oil return hole is formed in each oil guide groove; each oil guide groove is in a spiral shape with the rotating shaft of the corresponding bush as the center, and the spiral direction is the same as the rotating direction of the corresponding shaft. The oil collecting groove and the oil discharging hole are formed in the shaft sleeve base body, the oil return hole and the spiral oil guide groove are formed in the lining, a gear scrapes oil liquid which is about to leak into the oil collecting groove again, then the oil liquid enters the oil return hole along the oil discharging hole and then enters the oil guide groove, a dynamic pressure oil film is formed, and therefore the interior of the shaft sleeve is lubricated, and the lubricating effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic components, and particularly to a self-lubricating floating bushing. Background Art

[0002] In modern hydraulic technology, gear pumps are pump components with simple structures, the largest production and usage amounts. Their principle mainly involves a pair of meshing gears, and the periodic change of the tooth space volume is utilized to achieve oil suction and oil discharge. With the technological development of high-pressure miniaturization of gear pumps, the demand for hydraulic components has further increased.

[0003] The floating bushing is a key structural component in a gear pump and also the axial compensation device of the gear pump. The automatic compensation of the clearance is achieved by pressing the floating bushing against the gear end face through oil pressure, thereby reducing the friction between the gear and the pump housing and improving the sealing performance. While the gear pump is transporting oil, the oil will also enter the inside of the bushing to act as lubricating oil for lubrication, thereby reducing the friction between the gear and the inside of the bushing. However, during the actual operation process, on the one hand, due to the high-load and fast-rotating working environment of the gear pump, the contact surface between the floating bushing and the gear wears, local voids will appear on the contact surface, and part of the lubricating oil will leak out from these voids, so the lubricating oil entering the inside of the bushing will decrease. On the other hand, relying solely on traditional lubrication methods, the improvement effect on the friction problem between the gear and the inside of the bushing is very limited. These two factors lead to low lubrication effect between the inside of the bushing and the gear shaft, ultimately reducing the operating efficiency, reliability, and service life of the gear pump.

[0004] Regarding the problem of low lubrication effect between the inside of the floating bushing and the gear shaft, no effective solution has been proposed yet. Summary of the Invention

[0005] In the present invention, a self-lubricating floating bushing is provided to solve the problem of low lubrication effect between the inside of the floating bushing and the gear shaft.

[0006] In a first aspect, the present invention provides a self-lubricating floating bushing, comprising:

[0007] A bushing base body, whose first end face is used to contact the gear, and two shaft holes are provided on the first end face;

[0008] Two bushings, which are respectively installed in the two shaft holes without clearance, and the gear shaft is installed in the corresponding shaft hole through one of the bushings;

[0009] At least one oil collecting groove is provided on the first end face and around each shaft hole, and at least one oil discharging hole communicating with the corresponding oil collecting groove is provided in each shaft hole; at least one oil guiding groove is provided on the inner wall of each bushing, and at least one oil returning hole corresponding to and communicating with the corresponding at least one oil discharging hole is provided in each oil guiding groove; each oil guiding groove is spiral with the rotation axis of the corresponding bushing as the center, and the spiral direction is the same as the rotation direction of the corresponding shaft.

[0010] In some embodiments thereof, two oil guiding grooves are provided on each bushing, and the two oil guiding grooves are rotationally symmetric about the central axis of the shaft hole by 180°.

[0011] In some embodiments thereof, a low-pressure unloading groove and a high-pressure unloading groove are provided on the first end face of the bushing base body. The high-pressure unloading groove and the low-pressure unloading groove are both located between the two shaft holes. The two shaft holes are respectively communicated with the two ends of the low-pressure unloading groove. A pressure oil groove and an oil suction groove are provided on the side wall of the bushing base body. The high-pressure unloading groove is communicated with the pressure oil groove. Two high-pressure zone oil guiding grooves and two low-pressure zone oil guiding grooves are symmetrically provided on the second end face of the bushing base body. The two high-pressure zone oil guiding grooves are both communicated with the pressure oil groove, and the two low-pressure zone oil guiding grooves are both communicated with the oil suction groove. One end of each of the two oil guiding grooves is respectively communicated with the low-pressure unloading groove and the low-pressure zone oil guiding groove.

[0012] In some embodiments thereof, three oil returning holes are provided on the inner wall of each oil guiding groove, and the three oil returning holes are evenly distributed along the oil guiding groove.

[0013] In some embodiments thereof, each set of oil collecting groove groups includes one oil collecting groove. The oil collecting groove is arc-shaped, and the central connection line of the two oil collecting grooves passes through the centers of the two shaft holes. The two ends and the middle of each oil collecting groove are communicated with the oil discharging holes.

[0014] In some embodiments thereof, the arc is a semi-circle, and the oil collecting groove is concentrically arranged with the shaft hole.

[0015] In some embodiments thereof, a plurality of strip-shaped protrusions are provided on the outer wall of each bushing along the circumferential direction. The strip-shaped protrusions extend along the axial direction of the bushing. A plurality of strip-shaped grooves corresponding to the strip-shaped protrusions one by one are provided on the inner wall of the shaft hole, and at least one end of the strip-shaped groove extends to the end face of the bushing base body.

[0016] In some embodiments thereof, two sub-high-pressure zone oil guiding grooves are further provided on the side wall of the bushing base body, and the central connection line of the two sub-high-pressure zone oil guiding grooves passes through the centers of the two shaft holes.

[0017] In some embodiments thereof, a sealing ring groove is further provided on the second end face of the bushing base body. The sealing ring groove is in a "3" shape, and the two high-pressure zone oil guiding grooves are communicated with the sealing ring groove.

[0018] Secondly, a gear pump is provided in the present invention, including:

[0019] Bushing;

[0020] Two gears, the shafts of which are movably installed in the bushing;

[0021] The bushing is the self-lubricating floating bushing described in the first aspect.

[0022] Compared with the related art, the present invention has the following beneficial effects:

[0023] 1. On the one hand, by providing an oil collecting groove and an oil discharging hole on the bushing matrix and an oil return hole and an oil guiding groove on the bushing, once the contact surface between the floating bushing and the gear wears and local voids appear on the contact surface, under the influence of the rotation of the gear, the about-to-leak oil will be scraped back into the oil collecting groove, then enter the oil return hole along the oil discharging hole and then enter the oil guiding groove, thereby lubricating the inside of the bushing, preventing the lubricating oil entering the inside of the bushing from decreasing, and ensuring that the lubrication effect between the inside of the bushing and the shaft of the gear will not decline. On the other hand, compared with the traditional floating bushing where the oil can only enter the shaft hole in one direction and then adhere to the shaft of the gear and rotate with it to achieve a certain lubrication effect, the helically arranged oil guiding groove inside the bushing can better introduce the oil and expand the coverage range of the oil on the bushing, improving the lubrication effect of the oil. And because the helical direction of the oil guiding groove is the same as the rotation direction of the gear, using the pumping effect caused by the rotation of the shaft of the gear, the lubricating oil entering the inside of the oil guiding groove is evenly transported to the inner wall of the bushing to form a dynamic pressure oil film in the same direction as the rotation direction of the shaft, further reducing the friction coefficient between the inside of the bushing and the shaft of the gear. Solve the problem of low lubrication effect between the inside of the floating bushing and the shaft of the gear, and improve the operating efficiency, reliability and service life of the gear pump.

[0024] 2. When the gear pump is working, the oil will enter the pump body from the oil suction port, then enter the low-pressure area oil guiding groove through the oil suction cavity, and the oil in the trapped oil area of the gear will enter one end of the oil guiding groove through the low-pressure unloading groove, and under the self-priming effect in the low-pressure area of the gear pump, the oil will enter the low-pressure area oil guiding groove along the oil guiding groove to form a self-lubricating circulation oil path of "leakage oil recovery - lubrication - circulation", and the heat dissipation capacity of the floating bushing is enhanced through the reciprocating circulation of the oil.

[0025] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an exploded view of the structure of the self-lubricating floating bushing proposed in this embodiment;

[0027] Figure 2 is a front view structural schematic diagram of the first end face of the self-lubricating floating bushing proposed in this embodiment;

[0028] Figure 3 It is a front view structural schematic diagram of the second end face of the self-lubricating floating bushing proposed in this embodiment;

[0029] Figure 4 It is a side sectional view of the self-lubricating floating bushing proposed in this embodiment.

[0030] In the figure: 1. Bushing matrix; 2. Borehole; 3. Bushing; 4. Low-pressure unloading groove; 5. High-pressure unloading groove; 6. Seal ring groove; 7. High-pressure area oil guiding groove; 8. Low-pressure area oil guiding groove; 9. Sub-high-pressure area oil guiding groove; 10. Oil collecting groove; 11. Oil discharging hole; 12. Oil return hole; 13. Oil guiding groove; 14. Strip-shaped protrusion; 15. Strip-shaped groove; 16. Oil suction groove; 17. Oil pressure groove. Specific embodiments

[0031] To understand the purpose, technical solution and advantages of this application more clearly, the following describes and explains this application in combination with the accompanying drawings and embodiments.

[0032] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by those with ordinary skills in the technical field to which this application belongs. In this application, words such as "a", "one", "a kind", "the", "these" and the like do not indicate a limitation in quantity, and they can be singular or plural. The terms "including", "comprising", "having" and any variants thereof involved in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent in these processes, methods, products or devices. The terms "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. Usually, the character " / " indicates that the associated objects before and after are in an "or" relationship. The terms "first", "second", "third" and the like involved in this application are only used to distinguish similar objects and do not represent a specific sorting of the objects.

[0033] A gear pump generally includes a bushing base body and a pair of gears, namely a driving gear and a driven gear respectively. The bushing base body is usually a columnar structure with a pair of shaft holes, and the shafts of the two gears are respectively installed in the two shaft holes. This embodiment mainly provides a new bushing base body.

[0034] In this embodiment, a self-lubricating floating bushing is provided. Referring to Figure 1 as shown, the self-lubricating floating bushing includes: a bushing base body 1 and two bushings 3. The self-lubricating floating bushing of the present invention is mainly applied to a gear pump. In addition to the self-lubricating floating bushing, the gear pump may also include a driving gear and a driven gear. The shafts of the driving gear and the driven gear are both movably installed in the self-lubricating floating bushing. The gear pump installed with the self-lubricating floating bushing is beneficial to improving its operating efficiency, reliability and service life.

[0035] Please refer to Figure 2 、 Figure 3 , the cross-section of the bushing base body 1 is in the shape of an "8". The first end face of the bushing base body 1 is used to contact the gear and has a pair of shaft holes 2 for installing the shafts of the gears. The gears can be the driving gear and the driven gear of a gear pump (not shown), so the two shaft holes 2 can be the shaft hole 2 of the driving gear and the shaft hole 2 of the driven gear respectively. When installing the gear pump, insert the two shaft holes 2 on the bushing base body 1 respectively into the shafts of the driving gear and the driven gear. There is a rotational contact between the shaft holes 2 and the shafts of the gears. The first end face of the bushing base body 1 is the one that contacts the end face of the gear. Two groups of oil collecting groove groups are provided on the first end face of the bushing base body 1. Each group of oil collecting groove groups includes at least one oil collecting groove 10. The two groups of oil collecting groove groups are respectively on the opposite sides of the two shaft holes 2. The oil collecting groove 10 has a complete side wall, that is, the oil collecting groove 10 is not connected to the side wall of the bushing base body 1, that is, the oil entering the oil collecting groove 10 will not flow out from the side wall of the bushing base body 1. At least one oil discharging hole 11 communicating with the oil collecting groove 10 on the same side is provided on the inner walls of the two shaft holes 2. The first end face of the bushing base body 1 contacts the gear. Once local voids appear due to wear on the contact surface, under the influence of the rotation of the gear, the about-to-leak oil will be scraped back into the oil collecting groove by it, thus completing the collection of the leaked oil.

[0036] In order to better collect the leaked oil, in this embodiment, referring to Figure 2As shown, each oil collecting tank group is exemplified by including one oil collecting tank 10. The oil collecting tank 10 can be arc-shaped, and the center connection line of the two oil collecting tanks 10 can pass through the centers of the two shaft holes 2, that is, the two oil collecting tanks 10 can be symmetrically distributed along the symmetry axis of the bushing base 1. The number of oil discharge holes 11 is exemplified by three. Both ends and the middle of each oil collecting tank 10 are communicated with one of the oil discharge holes 11, that is, the oil collecting tank 10 is connected to three oil discharge holes 11, and one end openings of the oil discharge holes 11 can be evenly arranged on the inner bottom wall of the oil collecting tank 10, and the oil collecting tank 10 is arranged at a position where oil is more likely to leak, so as to achieve a better collection effect.

[0037] The arc can be a semi-circle, and the oil collecting tank 10 and the shaft hole 2 can be concentrically arranged. The diameter of the semi-circle should be larger than the diameter of the shaft hole 2. If the oil collecting tank 10 is too large, it will reduce the bearing capacity of the bushing base 1 to a certain extent. Therefore, on the premise of ensuring the stability of the bushing base 1, the collection capacity of the oil collecting tank 10 should be expanded as much as possible.

[0038] Refer to Figure 1 As shown, two bushings 3 (also called DU bearings, which play a role in supporting the gear shaft and further reducing friction) are respectively arranged in the two shaft holes 2. The outer wall of the bushing 3 is in non-gap contact with the inner wall of the corresponding shaft hole 2. The aperture of the shaft hole 2 is smaller than the diameter of the bushing 3, that is, there is an interference fit between the bushing base 1 and the bushing 3, and oil is not easy to enter the gap between them. At least one oil guiding groove 13 (the height of the oil guiding groove 13 in the vertical direction is equal to the length of the bushing 3) can be opened on the inner wall of each bushing 3. Each oil guiding groove 13 is spiral with the rotation axis of the corresponding bushing 3 as the center, and the spiral direction (observed from the top or bottom of the spiral. If the spiral extends clockwise, it is the clockwise direction. If the spiral extends counterclockwise, it is the counterclockwise direction) is the same as the rotation direction of the corresponding shaft. At least one oil return hole 12 corresponding to and communicated with the corresponding at least one oil discharge hole 11 is arranged on the inner wall of each oil guiding groove 13. After being communicated, the oil collected by the oil collecting tank 10 can be transported into the oil guiding groove 13 for lubrication. Compared with the traditional floating bushing, in which the oil can only enter the shaft hole 2 in one direction and then adhere to the shaft of the gear and rotate with it to achieve a certain lubrication effect, the spiral oil guiding groove 13 arranged inside the bushing 3 can better introduce the oil and expand the coverage range of the oil on the bushing 3, improve the lubrication effect of the oil, and because the spiral direction of the oil guiding groove 13 is the same as the rotation direction of the gear, using the pumping effect caused by the rotation of the shaft of the gear, the lubricating oil entering the oil guiding groove 13 is evenly transported to the inner wall of the bushing 3 to form a dynamic pressure oil film in the same direction as the rotation direction of the shaft, further reducing the friction coefficient between the inside of the bushing and the shaft of the gear.

[0039] To better form a hydrodynamic oil film, on the premise of ensuring the interconnection between the oil guide groove 13 and the oil sump 10, more oil guide grooves 13 can also be provided on the inner wall of the bushing 3. Refer to Figure 4 As shown, in this embodiment, two are taken as examples for illustration. Two oil guide grooves 13 are provided on each bushing 3, and the two oil guide grooves 13 are rotationally symmetric about the central axis of the shaft hole 2 by 180°, so as to expand the oil guiding area on the bushing 3, thereby forming a more stable hydrodynamic oil film. Three oil return holes 12 can also be provided on the inner wall of each oil guide groove 13. These three oil return holes 12 are in one-to-one correspondence and communication with the three oil discharge holes 11 of the same oil sump 10. The aperture of the oil return hole 12 is the same as that of the oil discharge hole 11. And in order to prevent the abrasive debris generated by wear from blocking the oil discharge hole 11, the aperture of the oil discharge hole 11 is usually greater than 0.5 mm. The three oil return holes 12 can be evenly distributed along the oil guide groove 13, so that the oil liquid input into the oil guide groove 13 is more uniform, and the formation of the hydrodynamic oil film is accelerated.

[0040] To make the oil return hole 12 more accurately correspond and communicate with the oil discharge hole 11, in this embodiment, refer to Figure 1 As shown, the outer wall of the bushing 3 can have a plurality of strip-shaped protrusions 14 along the circumferential direction. Exemplarily, the strip-shaped protrusions 14 can be set to three or more (three are provided in this embodiment). A plurality of strip-shaped grooves 15 corresponding to the strip-shaped protrusions 14 one by one are provided on the inner wall of the shaft hole 2. At least one end of the strip-shaped groove 15 extends to the end face of the bushing base 1, or both ends can extend to the end face of the bushing base 1. When installing the bushing 3, just slide the strip-shaped protrusion 14 into the corresponding strip-shaped groove 15.

[0041] Please combine with Figure 2 、 Figure 3, in this embodiment, a low-pressure unloading groove 4 and a high-pressure unloading groove 5 are provided on the first end face of the bushing base body 1. Both the high-pressure unloading groove 5 and the low-pressure unloading groove 4 are located between the two shaft holes 2. The two shaft holes 2 are respectively communicated with both ends of the low-pressure unloading groove 4. An oil pressure groove 17 and an oil suction groove 16 are provided on the side wall of the bushing base body 1. When the floating bushing is installed in the gear pump, an oil pressure chamber will be formed between the oil pressure groove 17 and the housing of the gear pump. Similarly, an oil suction chamber will be formed between the oil suction groove 16 and the housing of the gear pump. The high-pressure unloading groove 5 is communicated with the oil pressure groove 17, and the low-pressure unloading groove 4 is perpendicular to the high-pressure unloading groove 5. Two high-pressure zone oil guiding grooves 7 and two low-pressure zone oil guiding grooves 8 are symmetrically provided on the second end face of the bushing base body 1. Both of the two high-pressure zone oil guiding grooves 7 are communicated with the oil pressure groove 17, and both of the two low-pressure zone oil guiding grooves 8 are communicated with the oil suction groove 16. Both ends of one of the oil guiding grooves 13 are respectively communicated with the low-pressure unloading groove 4 and the low-pressure zone oil guiding groove 8, and both ends of the other oil guiding groove 13 respectively extend to the first end face and the second end face of the bushing base body 1. A 45° chamfer can also be provided at the opening position of the oil guiding groove 13 to facilitate the circulating flow of the oil fluid. When the gear pump is working, during the oil suction process, on the side where the two gears are disengaged, since a gradually expanding sealed cavity is formed between the teeth and tooth grooves of the gears, the volume of this sealed cavity gradually increases from zero. Due to the increase in the volume of the sealed cavity, the pressure inside the cavity decreases, forming a vacuum, and the pressure at the oil suction port is usually atmospheric pressure or other external pressures. Therefore, a pressure difference is formed between the oil suction port and the sealed cavity, and the oil fluid will enter the pump body from the oil suction port, and then enter the low-pressure zone oil guiding groove 8 through the oil suction chamber. The oil fluid in the trapped oil area of the gears (the trapped oil area is usually located in the meshing transition area of the two gears, that is, the area where the gears transition from disengaged meshing to engaged meshing) will enter the oil guiding groove 13 through the low-pressure unloading groove 4, and under the self-priming action in the low-pressure zone of the gear pump, the oil fluid flows along the oil guiding groove 13 into the low-pressure zone oil guiding groove 8 to form a self-lubricating circulation oil path of "leakage oil recovery - lubrication - circulation", and the heat dissipation capacity of the floating bushing is enhanced through the reciprocating circulation of the oil fluid; during the oil discharge process, on the side where the two gears are engaged, due to the rotation of the gears, the oil fluid in the sealed cavity is compressed, and the sealed volume continuously decreases, and the pressure continuously increases. Then the high-pressure oil fluid enters the oil pressure chamber (pressure relief) through the high-pressure unloading groove 5 and finally discharges from the oil discharge port out of the pump body to realize the transportation of the oil fluid.

[0042] Refer to Figure 3As shown in the figure, a sealing ring groove 6 may also be provided on the second end face of the bushing base body 1. The sealing ring groove 6 may be in the shape of a "3". Two high-pressure zone oil guiding grooves 7 communicate with the sealing ring groove 6. The sealing ring groove 6 divides the second end face of the floating bushing into a high-pressure zone and a low-pressure zone. Among them, the high-pressure zone is located on the convex side of the sealing ring groove 6, and the low-pressure zone is located on the concave side of the sealing ring groove 6. The sealing ring groove 6 plays a sealing role during the oil drainage process to prevent the high-pressure oil from flowing back to the low-pressure zone. At the same time, the floating bushing will lead the high-pressure oil at the outlet of the gear pump to the second end face of the floating bushing through the two high-pressure zone oil guiding grooves 7 in the high-pressure zone, pushing the second end face of the floating bushing to closely combine with the gear end face, reducing the leakage at the end face of the gear pump and improving the volumetric efficiency of the gear pump.

[0043] Two sub-high-pressure zone oil guiding grooves 9 may also be provided on the side wall of the bushing base body 1. The central connection line of the two sub-high-pressure zone oil guiding grooves 9 may pass through the centers of the two shaft holes 2. When the gear pump is working, on the side where the two gears are disengaged, there is also a gap between the tooth clearance of the gear and the pump body, which will carry oil. And as the gear rotates, some oil will pass through the sub-high-pressure zone oil guiding grooves 9 of the floating bushing, thereby increasing the lubrication between the floating bushing and the pump body and improving the floating property of the sliding bushing.

[0044] To sum up, on the one hand, by providing an oil collecting groove 10 and an oil discharging hole 11 on the bushing base body 1, and an oil return hole 12 and an oil guiding groove 13 on the bushing 3. Once the contact surface between the floating bushing and the gear is worn and local voids appear on the contact surface, under the influence of the rotation of the gear, the about-to-leak oil will be scraped back into the oil collecting groove 10, then enter the oil return hole 12 through the oil discharging hole 11 and then enter the oil guiding groove 13, thereby lubricating the inside of the bushing, preventing the lubricating oil entering the inside of the bushing from decreasing, and ensuring that the lubrication effect between the inside of the bushing and the shaft of the gear will not decline. On the other hand, compared with the traditional floating bushing in which the oil can only enter the shaft hole 2 in one direction and then adhere to the shaft of the gear and rotate with it to achieve a certain lubrication effect, the helically arranged oil guiding groove 13 inside the bushing 3 can better introduce the oil and expand the coverage range of the oil on the bushing 3, improving the lubrication effect of the oil. And because the helical direction of the oil guiding groove 13 is the same as the rotation direction of the gear, using the pumping effect caused by the rotation of the shaft of the gear, the lubricating oil entering the inside of the oil guiding groove 13 is evenly transported to the inner wall of the bushing 3, forming a dynamic pressure oil film in the same direction as the rotation direction of the shaft, further reducing the friction coefficient between the inside of the bushing and the shaft of the gear. Solved the problem of low lubrication effect between the inside of the floating bushing and the shaft of the gear, and improved the operating efficiency, reliability and service life of the gear pump.

[0045] When the gear pump is working, the oil will enter the pump body from the oil suction port, and then enter the low-pressure oil guiding groove 8 through the oil suction cavity. The oil in the trapped oil area of the gear will enter one end of the oil guiding groove 13 through the low-pressure unloading groove 4, and under the self-priming effect in the low-pressure area of the gear pump, the oil will flow along the oil guiding groove 13 into the low-pressure oil guiding groove 8 to form a self-lubricating circulation oil path of "leakage oil recovery - lubrication - circulation". The heat dissipation capacity of the floating bush is enhanced through the reciprocating circulation of the oil.

[0046] It should be understood that the specific embodiments described herein are only used to explain this application, rather than to limit it. According to the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

[0047] Obviously, the accompanying drawings are only some examples or embodiments of this application. For those of ordinary skill in the art, this application can also be applied to other similar situations based on these drawings without creative work. Additionally, it can be understood that although the work done during this development process may be complex and time-consuming, for those of ordinary skill in the art, certain design, manufacturing, or production changes based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient disclosure of this application.

Claims

1. A self-lubricating floating sleeve, comprising: A shaft sleeve base (1), the first end surface of which is used to contact the gear, and the first end surface is provided with two shaft holes (2); Two bushings (3) are respectively installed in the two shaft holes (2) without clearance, and the shaft of the gear is installed in the corresponding shaft hole (2) through one of the bushings (3); It is characterized in that at least one oil collecting groove (10) is provided on the first end surface and on the periphery of each shaft hole (2), and each shaft hole (2) is provided with at least one oil discharge hole (11) connected to the corresponding oil collecting groove (10); at least one oil guide groove (13) is provided on the inner wall of each bushing (3), and at least one oil return hole (12) is provided in each oil guide groove (13) that corresponds to and is connected to the corresponding at least one oil discharge hole (11); each oil guide groove (13) is spirally shaped with the rotation axis of the corresponding bushing (3) as the center, and the spiral direction is the same as the rotation direction of the corresponding shaft.

2. The self-lubricating floating sleeve according to claim 1, characterized in that: Each bushing (3) is provided with two oil guide grooves (13), and the two oil guide grooves (13) are rotationally symmetrical at 180 degrees about the central axis of the shaft hole (2).

3. The self-lubricating floating sleeve according to claim 2, characterized in that: The first end surface of the shaft sleeve base (1) is provided with a low-pressure unloading groove (4) and a high-pressure unloading groove (5), both of which are located between two shaft holes (2), and the two shaft holes (2) are respectively connected to the two ends of the low-pressure unloading groove (4), and the side wall of the shaft sleeve base (1) is provided with an oil pressure groove (17) and an oil suction groove (16), and the high-pressure unloading groove (5) is connected to the oil pressure groove (17), and the second end surface of the shaft sleeve base (1) is symmetrically provided with two high-pressure area oil guide grooves (7) and two low-pressure area oil guide grooves (8), both of which are connected to the oil pressure groove (17), and both of which are connected to the oil suction groove (16), and the two ends of one of the oil guide grooves (13) are respectively connected to the low-pressure unloading groove (4) and the low-pressure area oil guide groove (8).

4. The self-lubricating floating sleeve according to claim 2, characterized in that: Three oil return holes (12) are arranged on the inner wall of each oil guide groove (13), and the three oil return holes (12) are evenly distributed along the oil guide groove (13).

5. The self-lubricating floating sleeve according to claim 1, characterized in that: Each oil collecting tank group comprises an oil collecting tank (10), the oil collecting tank (10) is arc-shaped, and the center line of the two oil collecting tanks (10) passes through the centers of the two shaft holes (2), and both ends and the middle of each oil collecting tank (10) are connected to the oil unloading hole (11).

6. The self-lubricating floating sleeve according to claim 5, characterized in that: The arc shape is a semicircular arc, and the oil collecting groove (10) is arranged concentrically with the shaft hole (2).

7. The self-lubricating floating sleeve according to claim 1, characterized in that: The outer wall of each bushing (3) is provided with a plurality of strip-shaped protrusions (14) along the circumferential direction, the strip-shaped protrusions (14) extending along the axial direction of the bushing (3), the inner wall of the shaft hole (2) is provided with a plurality of strip-shaped grooves (15) corresponding one-to-one to the strip-shaped protrusions (14), and at least one end of the strip-shaped grooves (15) extends to the end surface of the bushing base (1).

8. The self-lubricating floating sleeve according to claim 1, characterized in that: The side wall of the shaft sleeve base (1) is also provided with two secondary high-pressure area oil guide grooves (9), and the center line connecting the two secondary high-pressure area oil guide grooves (9) passes through the centers of the two shaft holes (2).

9. The self-lubricating floating sleeve according to claim 4, characterized in that: The second end surface of the shaft sleeve base (1) is also provided with a sealing ring groove (6), the sealing ring groove (6) is in a "3" shape, and the two high-pressure area oil guide grooves (7) are connected to the sealing ring groove (6).

10. A gear pump comprising: Bushings; The shafts of the two gears are movably mounted in the sleeves; It is characterized in that the sleeve is a self-lubricating floating sleeve as described in any one of claims 1-9.

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