A plastic plain bearing with a metal sheet

Abstract

The application relates to the technical field of bearings, in particular to a plastic plane bearing with a piece type, which comprises an upper bearing cover, a lower bearing base and end face rotating chips and friction sheets arranged in the upper and lower bearing cover; an axial cavity is formed between the bearing base and the bearing cover; the end face rotating chips are arranged in the axial cavity and lubricant is arranged in the axial cavity; the friction sheets are arranged on the two sides of the end face rotating chips and slide and rub with the end face rotating chips; and the friction sheets are provided with limiting structures for limiting the rotation of the friction sheets between the bearing base and the bearing cover. The bearing has a service life which is longer than that of a plastic plane bearing and almost the same as that of a metal rolling bearing, and has the impact resistance and mud water resistance which are not possessed by the metal rolling bearing; the cost is slightly higher than that of the plastic plane bearing, and the bearing has high economic value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a plastic plane bearing with a piece-shaped structure. BACKGROUND

[0002] The existing automobile suspension bearings are mainly divided into two types, namely plastic metal composite rolling bearings and plastic plane bearings, and each type has its own advantages and disadvantages. The plastic metal composite rolling bearing adopts upper and lower plastic shells to cover the metal raceway, and a certain number of steel balls are used as rolling elements. The advantages are small torque, low noise, large load capacity, and wide adaptability. The disadvantages are high cost, poor mud adaptability, poor impact resistance, and complex process. The bearing shell and rotating core of the plastic plane bearing are made of plastic. The advantages are low cost, stable rotation, good mud adaptability, and impact resistance. The disadvantages are large torque, easy to produce noise, and small radial load.

[0003] Due to the impact resistance and mud resistance of the plane bearing, and the cost is much lower than that of the rolling bearing, many main machine factories have prepared to replace the rolling bearing with the plane bearing. However, the existing plane bearing has the disadvantages of large torque and high noise, which is difficult to meet the use requirements.

[0004] Therefore, it is necessary to improve the prior art. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, a plastic plane bearing with a piece-shaped structure is provided, which has moderate torque, low noise, moderate load capacity, moderate cost, stable rotation, good mud adaptability, and good impact resistance.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0007] A plastic plane bearing with a piece-shaped structure, comprising an upper bearing cover and a lower bearing base arranged in a vertical direction, and an axial cavity formed between the bearing base and the bearing cover, further comprising:

[0008] An end face rotating core arranged in the axial cavity, and a lubricant arranged in the axial cavity;

[0009] A friction plate arranged on both sides of the end face rotating core and in sliding friction with the end face rotating core, and a limiting structure arranged between the friction plate and the bearing base or the bearing cover to limit the rotation of the friction plate.

[0010] In order to improve the radial load capacity of the bearing, the bearing base and the bearing cover are coaxially arranged, the inner sides of the bearing base and the bearing cover are extended to one side along the axis and form a radial cavity, and a radial rotating core is arranged in the radial cavity to bear the radial force and reduce the rotation torque.

[0011] In order to limit the position of the friction sheet, a limit edge is arranged on the end face formed by the bearing cover in the axial cavity, the limit edge is arranged circumferentially along the bearing cover and forms a plurality of limit intervals on the end face, the friction sheet is arranged in the limit interval and has a gap with the limit edge, so that when the bearing rotates, the friction sheet continuously presses the lubricant in the oil groove, the lubricant is continuously brought between the four fluorine friction sheet and the core sheet by the rotating core sheet, a stable oil film is continuously formed, the wear of the bearing core sheet is reduced, the height of the friction sheet is higher than the limit edge, and sufficient wear of the four fluorine friction sheet is ensured in the whole life cycle of the bearing.

[0012] Further, a limit edge is arranged on the end face formed by the bearing base in the axial cavity, the limit edge is arranged circumferentially along the bearing base and forms a plurality of limit intervals on the end face, the friction sheet is arranged in the limit interval and has a gap with the limit edge, and the height of the friction sheet is higher than the limit edge.

[0013] In order to reasonably arrange the friction sheet, the limit edge is uniformly distributed along the circumference of the bearing cover or the bearing base and separates the end face into a plurality of fan-shaped limit intervals, the friction sheet is a A sheet type fan-shaped friction sheet adapted to the fan-shaped limit interval, and the limit interval is provided with lubricating grease.

[0014] In order to seal the bearing, the outer sides of the bearing cover and the bearing base extend towards each other and form a labyrinth seal groove, and a TPU sealing ring is arranged in the labyrinth seal groove and forms a line contact with the labyrinth seal groove.

[0015] Further, the labyrinth seal groove comprises two sealing rings I formed by the extension of the outer side of the bearing base and two sealing rings II formed by the extension of the outer side of the bearing cover, the two sealing rings I form an annular groove I, the upper side of the TPU sealing ring is provided with a sealing slope, the TPU sealing ring is arranged in the annular groove I, and the sealing slope of the TPU sealing ring forms a line seal with one of the sealing rings II. Through the TPU sealing ring, the grease in the bearing is in a relatively closed environment, the erosion of external mud and water is reduced, and the loss of lubricating grease in the bearing is also reduced to the greatest extent.

[0016] Further, the radial cavity is communicated with the axial cavity, and the axial cavity and the radial cavity are both provided with a sealing structure.

[0017] Further, the end face rotating core sheet is made of steel or PP material.

[0018] Further, the friction sheet is a four fluorine friction sheet, and the height of the friction sheet is 0.15-0.25mm higher than the limit edge.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The application sets the limiting edge, which can limit the sliding position of the friction plate, and also can be the oil groove of the lubricating grease. When the bearing rotates back and forth, the lubricating grease in the oil groove is continuously extruded, and is brought into the friction plate and the chip by the rotating chip, continuously forming a stable oil film, reducing the wear of the bearing chip; the height of the friction plate is about 0.2mm higher than the edge, which ensures that the Teflon friction plate has sufficient wear amount in the whole life cycle of the bearing.

[0021] 2. The application installs the sealing ring of TPU material on the basis of the labyrinth seal groove, so that the grease in the bearing is in a relatively closed environment, reducing the erosion of external mud, and at the same time, the loss of the lubricating grease in the bearing is reduced to the maximum extent.

[0022] 3. The bearing described in the application has a service life that fully exceeds that of the plastic plane bearing, and is almost the same as that of the metal rolling bearing, and at the same time, has the impact resistance and mud resistance characteristics that the metal rolling bearing does not have, and the cost is only slightly higher than that of the plastic plane bearing, which has high economic value. BRIEF DESCRIPTION OF DRAWINGS

[0023] The specific embodiments of the application will be further described in detail below with the help of the drawings.

[0024] Figure 1 is the exploded structural schematic view of the application;

[0025] Figure 2 is the cross-sectional schematic view of the application;

[0026] Figure 3 is Figure 2 is the local enlarged view of A in the middle;

[0027] Figure 4 is the bearing base structure schematic view;

[0028] Figure 5 is the friction plate arrangement schematic view.

[0029] In the figure: 1-bearings cover, 11-limiting edge, 12-limiting interval, 13-labyrinth seal groove, 14-TPU sealing ring, 15-sealing ring II, 2-bearing base, 21-sealing ring I, 22-annular groove I, 3-axial cavity, 4-end face rotating chip, 5-friction plate, 6-radial cavity, 7-radial rotating chip. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1:

[0032] like Figures 1 to 5 As shown, a plate-type plastic plane bearing includes a bearing cover 1 and a bearing base 2 arranged above and below, as well as an end face rotating chip 4 and a friction plate 5. An axial cavity 3 is formed between the bearing base 2 and the bearing cover 1 for placing the end face rotating chip 4.

[0033] A limiting edge 11 is provided on the upper end face of the axial cavity 3, that is, the end face formed by the bearing cover 1. The height of the limiting edge 11 can be selected to be 0.8 mm. The limiting edge 11 is arranged along the circumference of the bearing cover 1, and a plurality of limiting intervals 12 are formed on the end face of the bearing cover 1. The limiting intervals 12 are preferably fan-shaped, forming a grid-type track on the end face. The limiting edges 11 can be evenly distributed along the circumference of the bearing cover 1, and the number can be set according to demand, with at least two set, preferably 12.

[0034] The friction plate 5 adopts a structure that is compatible with the limit interval 12, preferably in a sector shape. The number of friction plates 5 is the same as the number of limit intervals. The friction plate 5 is set in the limit interval 12 and has a gap with the limit edge 11. The gap size can be 1mm. Grease is provided in the limit interval. When the bearing reciprocates, the grease in the oil tank is continuously squeezed and carried by the end surface rotating chip into the space between the friction plate and the rotating chip, continuously forming a stable oil film and reducing wear on the rotating chip. To prevent the rotating chip from rubbing against the limit edge 11, the height of the friction plate 5 is 0.15-0.25mm higher than the end surface of the limit edge 11, ensuring sufficient wear of the friction plate throughout the life cycle of the bearing.

[0035] A grid-type track structure identical to the upper end face of the axial cavity 3 is provided on the lower end face formed by the bearing base 2 in the axial cavity 3. The grid-type track structure is circumferentially arranged along the bearing base 2 through a limiting edge, and a plurality of limiting intervals are formed on the end face. The friction plate 5 is arranged in the limiting interval and there is a gap between the friction plate 5 and the limiting edge. The height of the friction plate 5 is higher than the limiting edge.

[0036] The end face rotating chip 4 is arranged in the axial cavity 3. The upper and lower end faces of the end face rotating chip 4 slide and rub against the friction plate. The axial cavity 3 is filled with lubricant.

[0037] The outer sides of the bearing cover 1 and the bearing base 2 extend towards each other and form a labyrinth seal groove 13, which comprises two sealing rings I 21 formed by the outer side of the bearing base 2 and two sealing rings II 15 formed by the outer side of the bearing cover 1, and the two sealing rings I 21 form an annular groove I 22 in which a TPU sealing ring 14 is arranged, and the upper side of the TPU sealing ring 14 is provided with a sealing slope which forms a linear seal with one of the sealing rings II 15. The sealing enables the grease in the bearing to be in a relatively closed environment, reduces the erosion of external mud, and at the same time maximizes the loss of lubricating grease in the bearing.

[0038] The end face rotating chip 4 is made of steel, such as 65Mn steel, and is quenched and treated to have a hardness of 57HRC, a parallelism of 0.02mm and a roughness Ra of 0.2.

[0039] When the bearing requires to absorb a larger impact, the middle steel rotating chip can be replaced by a modified PP material chip, and the bearing life and durability performance is slightly reduced, and the friction torque is increased by 30%.

[0040] The friction plate 5 can be made of a tetrafluoroethylene friction plate with a hardness of 4.5HB, an elongation at break of 450% and a friction coefficient of 0.14. The four-flake tetrafluoroethylene friction plate can reduce the thermal deformation caused by friction heat, which is an important technical improvement for the durability and life of the plastic plain bearing. The traditional single-piece structure will cause the friction plate to warp after being heated, and the heat will cause the bearing shell to deform and the torque to increase sharply.

[0041] The bearing base and the bearing cover can be made of POM modified material by injection molding process, with a hardness of 80±5HD, an elongation at break of ≥18 and an impact strength of ≥60KJ / ㎡. EMBODIMENT

[0042] In order to improve the radial stress capacity of the bearing, a radial rotating chip 7 can be arranged between the bearing base 2 and the bearing cover 1 based on the bearing structure of Embodiment 1.

[0043] The bearing base 2 and the bearing cover 1 are coaxially arranged, the inner sides of the bearing base 2 and the bearing cover 1 extend along the axis to one side and form a radial cavity 6, the radial rotating chip 7 is arranged in the radial cavity 6, the radial rotating chip 7 can be made of pp modified material with a hardness of 82HD, an elongation at break of ≥40% and an impact strength of ≥5KJ / ㎡, an oil storage groove is designed on the inner diameter surface of the radial rotating chip 7 in contact with the bearing base, the upper end of the radial cavity 6 is connected with the axial cavity 3, and a sealing structure is arranged at the lower end of the radial cavity 6.

[0044] The test sample of the plastic sheet type plane bearing has been completed and passed the durability test of 1 million times, the product meets the requirements of the plane bearing test outline, the friction sheet after the durability test has the wear of 0.01-0.02mm on the single side, and meets the requirements. The test data are as follows:

[0045] ① Test standard of the durability test: axial load 5000N, rotation frequency 1Hz, rotation angle ±40°, cycle period 1 million times, friction torque <10N·m, and the torque after 1 million rotations is ≤8N·m.

[0046] Test result: 5.2N·m-5.6N·m, result determination: qualified.

[0047] ② Test standard of the starting torque:

[0048] Axial load: 5000N, after the durability test, the torque is tested after pressure maintaining for one minute: starting torque ≤10N·M.

[0049] Test result: 6.0N·M-6.5N·M, result determination: qualified.

[0050] Through the test, compared with the conventional plastic plane bearing, the torque of the present application is small, the bearing capacity is large, and the friction torque after the durability test rises by only 10%. The problem of bearing damage due to friction heat is completely solved, and it is not necessary to pause for heat dissipation in the middle, the main shortcomings of the conventional plastic plane bearing are solved, and the characteristics of the plane bearing, such as impact resistance, mud water resistance and high safety factor, are also retained.

[0051] The above only details the preferred embodiments of the present application, but the present application is not limited to the above embodiments, various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application, and various changes shall be included in the protection scope of the present application.

Claims

1. A plate-type plastic plane bearing, comprising a bearing cover (1) and a bearing base (2) arranged above and below, wherein an axial cavity (3) is formed between the bearing base (2) and the bearing cover (1), and characterized in that: include: The end surface rotating chip (4) is arranged in the axial cavity (3), and a lubricant is provided in the axial cavity (3); Friction plates (5) are arranged on both sides of the end face rotating chip (4) and are in sliding friction with the end face rotating chip (4); a limiting structure for limiting the rotation of the friction plate (5) is provided between the friction plate (5) and the bearing base (2) or the bearing cover (1); A limiting edge (11) is provided on the end surface formed by the bearing cover (1) in the axial cavity (3), the limiting edge (11) is provided along the circumference of the bearing cover (1) and forms a plurality of limiting intervals (12) on the end surface, the friction plate (5) is provided in the limiting interval (12) and has a gap with the limiting edge (11), and the height of the friction plate (5) is higher than the limiting edge (11); A limiting edge is provided on the end surface formed by the bearing base (2) in the axial cavity (3), the limiting edge is provided along the circumference of the bearing base (2) and forms a plurality of limiting intervals on the end surface, the friction plate (5) is provided in the limiting interval and has a gap with the limiting edge, and the height of the friction plate (5) is higher than the limiting edge; The limiting edges (11) are evenly distributed along the circumference of the bearing cover (1) or the bearing base (2) and divide the end face into a plurality of sector-shaped limiting intervals. The friction plate (5) is a sector-shaped friction plate adapted to the sector-shaped limiting interval, and the sector-shaped limiting interval is provided with grease. When the bearing reciprocates, the grease in the oil tank is continuously squeezed and brought into the space between the friction plate (5) and the end face rotating chip (4) by the end face rotating chip (4), thereby continuously forming a stable oil film and reducing the wear of the end face rotating chip (4).

2. The plate-type plastic plane bearing according to claim 1, characterized in that: The bearing base (2) and the bearing cover (1) are coaxially arranged, and the inner sides of the bearing base (2) and the bearing cover (1) extend to one side along the axis to form a radial cavity (6), and a radial rotating chip (7) is arranged in the radial cavity (6).

3. The plate-type plastic plane bearing according to claim 1, characterized in that: The outer sides of the bearing cover (1) and the bearing base (2) extend in a direction approaching each other and form a labyrinth sealing groove (13); a TPU sealing ring (14) is provided in the labyrinth sealing groove (13) and forms a line contact with the labyrinth sealing groove (13).

4. The plate-type plastic plane bearing according to claim 3, characterized in that: The labyrinth sealing groove (13) includes two sealing rings I (21) formed by extending from the outside of the bearing base (2) and two sealing rings II (15) formed by extending from the outside of the bearing cover (1), the two sealing rings I (21) form an annular groove I (22), the upper side of the TPU sealing ring (14) is provided with a sealing bevel, the TPU sealing ring (14) is arranged in the annular groove I (22), and the sealing bevel of the TPU sealing ring (14) forms a line seal with one of the sealing rings II (15).

5. The plate-type plastic plane bearing according to claim 2, characterized in that: The radial cavity (6) is communicated with the axial cavity (3), and both the axial cavity (3) and the radial cavity (6) are provided with a sealing structure.

6. The plate-type plastic plane bearing according to claim 1, characterized in that: The end face rotating chip (4) is made of steel or PP.

7. The plate-type plastic plane bearing according to claim 1, characterized in that: The friction plate (5) is a tetrafluoroethylene friction plate, and the friction plate (5) is 0.15-0.25 mm higher than the limiting edge.

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