Slewing bearing for semitrailer steering drive axle

Abstract

The utility model relates to a slewing bearing for a semitrailer steering drive axle, which comprises an inner ring, an outer ring, an oil cup, a sealing strip, a steel ball, a plug and a taper pin, the outer ring is sleeved outside the inner ring, opposite side surfaces of the outer ring and the inner ring are respectively provided with a raceway, the steel ball is arranged in the raceway, one side of the outer ring is provided with the oil cup, the other side of the outer ring is provided with a plug hole, and the plug is arranged in the plug hole. The upper side and the lower side of a gap between the outer ring and the inner ring are respectively provided with a sealing strip, the sections of the inner ring and the outer ring are both of an L-shaped structure which is arranged in sequence, the upper parts of the inner ring and the outer ring are both cylindrical ring bodies, the lower parts of the inner ring and the outer ring are both disc ring bodies, and the gap between the inner ring and the outer ring is controlled to be 0.001-0.04 mm. Countersunk bolt holes are respectively formed in the disc ring body of the inner ring and the disc ring body of the outer ring, and countersunk bolts are arranged in the countersunk bolt holes; the surface of the plug is recessed inwards in the circumferential direction to form a groove, and an O-shaped sealing ring is arranged in the groove. The slewing bearing is compact in structure, small in up-down floating, stable in overall structure and small in installation space.

Description

Technical Field

[0001] The utility model relates to a slewing bearing, in particular to a slewing bearing for a steering drive axle of a semitrailer, and belongs to the technical field of slewing bearings. Background Art

[0002] Slewing bearing is an important force transmission component on engineering machinery that can withstand axial force, radial force and overturning moment. It is widely used in real industry and is called "machine joint". It is widely used in automobile cranes, port cranes, railway cranes, ship cranes, container cranes, metallurgical cranes, excavators, filling machines, navigation instruments, as well as high-precision and cutting-edge fields such as CT standing wave therapy devices, radar antenna bases, missile launchers, tanks, robots and revolving restaurants. The force situation of slewing bearing is complex, and high requirements are placed on performance indicators. However, the technology and production equipment of most domestic slewing bearing manufacturers cannot meet the requirements for the time being.

[0003] The reasons why the performance indicators of domestic high-end slewing bearings are currently poor involve many aspects such as structural design, materials, heat treatment, machining, assembly, and testing.

[0004] At present, more and more semi-trailers are beginning to use slewing bearings on their steering drive axles. When the front tractor turns, the bogie will drive the tires at the rear of the semi-trailer to rotate in the opposite direction, so that the whole vehicle can turn. During the turning process, a slewing bearing is installed on the last row of driving wheels of the semi-trailer, which can make the whole vehicle compact, easy to guide and rotate, easy to install, and easy to maintain. At present, there are many slewing bearings on the market, whether in terms of structural design or maintenance. Figure 1 and 2 As shown, there are deficiencies in both production and processing;

[0005] Patent CN202597455U double L-shaped cross roller slewing bearing discloses that its outer ring is an L-shaped ring, and the inner ring is also an L-shaped ring. During the installation and use of the double L-shaped slewing bearing, the slewing bearing is connected to the main machine through bolts, and the bolt heads are placed in the L shape, which saves installation space; it can withstand a certain axial force, radial force and overturning moment, and is easy to install and disassemble.

[0006] Patent CN202719027U single-row four-point contact ball slewing bearing, the cross-sections of the outer gear ring (1) and the inner ring (2) are both L-shaped structures, and the size requirements are relatively high. While ensuring the bearing capacity, the height of the ring is reduced, so that the metal consumption of the utility model is greatly reduced and the cost is low.

[0007] In the structures of the slewing bearings of the above two patents, the inner ring and the outer ring form a double L-shape, one in the forward and the other inverted. The focus is relatively dispersed and the center of gravity is unstable, which makes it unstable during use and affects the stability. In addition, the structure is not compact enough, and there are defects such as large axial runout or large radial runout, which affects the accuracy of use. The flexibility is insufficient and the friction is large.

[0008] Therefore, developing a slewing bearing that can overcome the above defects has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0009] The technical problem to be solved by the utility model is to overcome the disadvantages of the prior art and provide a slewing bearing for a steering drive axle of a semitrailer, which has a compact structure, small up and down floating, stable overall structure and small installation space.

[0010] In order to solve the above technical problems, the utility model provides a slewing bearing for a steering drive axle of a semi-trailer, comprising an inner ring, an outer ring, an oil cup, a sealing strip, a steel ball, a plug and a conical pin. The outer ring is sleeved outside the inner ring, and the opposite sides of the outer ring and the inner ring are respectively provided with raceways, and a plurality of steel balls are arranged in the raceways. The outer ring is rotatably connected and integrated with the inner ring through the steel balls, and a threaded hole oil passage communicating with the raceway is transversely opened on one side of the outer ring, and the oil cup is installed on the oil passage. A plugging hole is provided on the side of the outer ring away from the oil cup, and a plug is detachably provided in the plugging hole, which is connected to the outer ring through the conical pin, and sealing strips are respectively arranged on the upper and lower sides of the gap between the outer ring and the inner ring, and the cross sections of the inner ring and the outer ring are both L-shaped structures arranged in sequence. The upper part of the inner ring is a cylindrical ring body, and the lower part is a disc ring body. The upper part of the outer ring is a cylindrical ring body, and the lower part is a disc ring body. The cylindrical ring body of the inner ring and the cylindrical ring body of the outer ring are respectively provided with raceways. The gap between the cylindrical ring body of the inner ring and the cylindrical ring body of the outer ring is controlled to be 0.001-0.04mm. The disc ring body of the inner ring and the disc ring body of the outer ring are respectively provided with countersunk bolt holes, and countersunk bolts are arranged in the countersunk bolt holes.

[0011] The blocking surface is concave inwardly along its circumferential direction to form a groove, and an O-type sealing ring is arranged in the groove.

[0012] The technical solution further defined in the utility model is:

[0013] Furthermore, in the aforementioned slewing bearing for the steering drive axle of the semi-trailer, the cylindrical ring body in the inner ring is provided with a sealing groove at the upper edge of one side of the raceway for placing a sealing strip, and the cylindrical ring body in the outer ring is provided with a sealing groove at the lower edge of one side of the raceway for placing a sealing strip.

[0014] Technical effect: the sealing groove is set to facilitate the placement of the sealing strip to ensure the sealing.

[0015] In the aforementioned slewing bearing for the steering drive axle of a semi-trailer, the gap includes an axial gap between the inner cylindrical ring body and the outer cylindrical ring body controlled to be 0.001-0.04mm, and a radial gap between the inner cylindrical ring body and the outer cylindrical ring body controlled to be 0.001-0.04mm.

[0016] Technical effect: the outer ring and the inner ring are set back to back, which is more conducive to controlling the gap. The size of the gap is strictly controlled and is smaller than the gap value of the industry standard. The small gap makes the up and down floating small and the jump small, ensuring the accuracy of use.

[0017] In the aforementioned slewing bearing for the steering drive axle of a semi-trailer, the roughness Ra of the raceway is 0.4 to 0.8 μm.

[0018] Technical effect: reducing the roughness of the raceway means that its friction coefficient is low, which can effectively reduce the friction between the steel ball and the raceway, thereby reducing the starting torque.

[0019] In the aforementioned slewing bearing for the steering drive axle of a semitrailer, the surfaces of the inner ring and the outer ring are provided with a layer of electrophoretic paint film.

[0020] Technical effect: a paint film is provided on the surface of the inner ring and the outer ring, which makes the slewing bearing have a certain degree of corrosion resistance. The paint film has the advantages of full, uniform, balanced and smooth coating. At the same time, the electrophoretic paint film has excellent hardness, adhesion, corrosion resistance, impact performance and penetration performance, which effectively prolongs the life of the slewing bearing and is not easy to fall off.

[0021] In the aforementioned slewing bearing for the steering drive axle of the semi-trailer, lubricating oil is provided in the raceway, and the lubricating oil is BLR-M bearing grease.

[0022] Technical effect: The utility model is provided with lubricating oil in the raceway, so that the slewing bearing is easy to maintain and the maintenance cost is low. Since the semi-trailer is used under heavy-duty conditions and is restricted by maintenance conditions, BLR-M bearing grease is used. The grease has good mechanical stability, can maintain good consistency during use, and can be used for a long time. The grease has excellent water resistance and rust prevention properties, can maintain good lubricity and corrosion resistance in a water environment, and ensures its flexibility while having a better use effect.

[0023] In the aforementioned slewing bearing for the steering drive axle of a semi-trailer, an isolation block is provided between two adjacent steel balls.

[0024] The beneficial effects of the utility model are:

[0025] When a semi-trailer steering drive axle is working with a slewing bearing, it is required that the slewing bearing clearance is small and the up and down floating is small, such as Figure 1 and 2As shown in the figure, the ordinary L-type slewing bearing has the disadvantages of large clearance and large runout, so the inner and outer rings and the inner ring of the ordinary L-type slewing bearing are redesigned, the direction of the inner ring L is changed, and the center of gravity of the slewing bearing is sunk, so that the overall structure is more stable, and at the same time the clearance is reduced, the runout is reduced, and further stability is achieved.

[0026] The L-shaped structures of the utility model are arranged in a back-to-back manner, making the overall structure more compact and smaller, and easy to install. The countersunk bolt holes are provided with countersunk bolts for fixing, and the screw heads do not protrude from the plane. When the surface is flat, the bolt heads are placed in the L-shaped structure, which saves installation space and can withstand certain axial forces, radial forces and overturning moments. Compared with the existing cylindrical head bolt installation, the cylindrical head bolts are installed as follows: Figure 4 As shown, it is easy to install and disassemble, the space is small, the structure is more compact, and the overall structure is more stable.

[0027] Compared with the structure and installation of the blockage in the prior art Figure 6 and 8 As shown, in order to prevent the added grease from leaking from the plugging place, the utility model designs an O-ring on the plugging, further enhancing the sealing performance, ensuring the sealing performance, and also ensuring the stability of lubrication.

[0028] The utility model is improved from multiple angles. The countersunk bolts and the sequential placement of the double L-shaped inner and outer rings effectively save installation space, and also lower the center of gravity to ensure the stability of the overall structure. At the same time, the gap is reduced to reduce the up and down floating, thereby improving the overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a common slewing bearing in the prior art;

[0030] Figure 2 It is another structural schematic diagram of a common slewing bearing in the prior art;

[0031] Figure 3 This is a schematic structural diagram of a slewing bearing for a steering drive axle of a semitrailer according to an embodiment of the utility model;

[0032] Figure 4 It is a structural schematic diagram of a slewing bearing in the prior art that is installed using common cylindrical head bolts;

[0033] Figure 5 This is a schematic structural diagram of a slewing bearing for a steering drive axle of a semitrailer according to an embodiment of the utility model, which is installed with countersunk bolts;

[0034] Figure 6 It is the blockage of the common slewing bearing in the prior art;

[0035] Figure 7This is a schematic structural diagram of a blockage in a slewing bearing for a steering drive axle of a semi-trailer according to an embodiment of the utility model;

[0036] Figure 8 It is a cross-sectional view of the plugging installation of a common slewing bearing in the prior art;

[0037] Fig. 9 This is a cross-sectional view of the plug installation in the slewing bearing for the steering drive axle of a semi-trailer according to an embodiment of the utility model;

[0038] In the figure: 1-inner ring, 2-outer ring, 3-oil cup, 4-sealing strip, 5-steel ball, 6-plug, 7-taper pin, 8-countersunk bolt, 9-groove, 10-O-ring. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0040] This embodiment provides a slewing bearing for a semitrailer steering drive axle, the structure of which is as follows Figure 3 , 5, 7 and 9, comprising an inner ring 1, an outer ring 2, an oil cup 3, a sealing strip 4, a steel ball 5, a plug 6 and a conical pin 7, the outer ring 2 is sleeved outside the inner ring 1, and opposite sides of the outer ring 2 and the inner ring 1 are respectively provided with raceways, a plurality of steel balls 5 are arranged in the raceways, the steel balls 5 are arranged in a ring shape in the same row, and an isolation block is provided between two adjacent steel balls 5, the outer ring 2 is rotatably connected to the inner ring 1 through the steel balls 5 and connected as a whole, a threaded hole oil passage communicating with the raceway is transversely provided on one side of the outer ring 2, the oil cup 3 is installed on the oil passage, a plugging hole is provided on the side of the outer ring 2 away from the oil cup 3, a plug 6 is detachably provided in the plugging hole, the conical pin 7 runs through the side wall of the outer ring, the plug 6 is connected to the outer ring 2 through the conical pin 7, a sealing groove is provided on the upper edge of one side of the raceway on the cylindrical ring body of the inner ring 1 for placing the sealing strip 4, and a sealing groove is provided on the lower edge of one side of the raceway on the cylindrical ring body of the outer ring 2 Used to place the sealing strip 4. In this way, the upper and lower sides of the gap between the outer ring 2 and the inner ring 1 are respectively provided with sealing strips 4. The cross-sections of the inner ring 1 and the outer ring 2 are both L-shaped structures. The upper part of the inner ring 1 is a cylindrical ring body, and the lower part is a disc ring body. The upper part of the outer ring 2 is a cylindrical ring body, and the lower part is a disc ring body. The cylindrical ring body of the inner ring 1 and the cylindrical ring body of the outer ring 2 are correspondingly provided with raceways. The gap between the cylindrical ring body of the inner ring 1 and the cylindrical ring body of the outer ring 2 is controlled to be 0.001-0.04mm. Countersunk bolt holes are respectively provided on the disc ring body of the inner ring 1 and the disc ring body of the outer ring 2. Countersunk bolts 8 are provided in the countersunk bolt holes. The surface of the countersunk bolt 8 is flush with the lower surface of the outer ring 2. The slewing bearing is connected to the main machine through the countersunk bolt 8. The bolt head is placed in the L shape, which saves installation space, can withstand certain axial force, radial force and overturning moment, and is easy to install and disassemble;

[0041] like Figure 7 and 9 As shown, the surface of the plug 6 is concave along its circumferential direction to form a groove 9, and an O-ring 10 is arranged in the groove 9.

[0042] In this embodiment, the gap includes an axial gap between the cylindrical ring body of the inner ring 1 and the cylindrical ring body of the outer ring 2 controlled to be 0.001-0.04 mm, and a radial gap between the cylindrical ring body of the inner ring 1 and the cylindrical ring body of the outer ring 2 controlled to be 0.001-0.04 mm.

[0043] In this embodiment, the roughness Ra of the raceway is 0.4-0.8 um.

[0044] In this embodiment, a layer of electrophoretic paint film is provided on the surfaces of the inner ring 1 and the outer ring 2 .

[0045] In this embodiment, lubricating oil is provided in the raceway, and the lubricating oil is BLR-M bearing grease.

[0046] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A slewing bearing for a steering drive axle of a semitrailer, comprising an inner ring (1), an outer ring (2), an oil cup (3), a sealing strip (4), a steel ball (5), a plug (6) and a conical pin (7), wherein the outer ring (2) is sleeved outside the inner ring (1), and the outer ring (2) and the inner ring (1) are provided with raceways on opposite sides thereof, and a plurality of steel balls (5) are provided in the raceways, and the outer ring (2) is rotatably connected to the inner ring (1) through the steel balls (5) and connected as a whole, and a threaded hole oil passage communicating with the raceway is transversely provided on one side of the outer ring (2), and the oil cup (3) is installed on the oil passage, and a plugging hole is provided on the side of the outer ring (2) away from the oil cup (3), and the plug (6) is detachably provided in the plugging hole, and the plug (6) is connected to the outer ring (2) through the conical pin (7), and the sealing strip (4) is provided on the upper and lower sides of the gap between the outer ring (2) and the inner ring (1), characterized in that: The cross-sections of the inner ring (1) and the outer ring (2) are both L-shaped structures in sequence. The upper part of the inner ring (1) is a cylindrical ring body and the lower part is a disc ring body. The upper part of the outer ring (2) is a cylindrical ring body and the lower part is a disc ring body. The cylindrical ring body of the inner ring (1) and the cylindrical ring body of the outer ring (2) are respectively provided with the raceway. The gap between the cylindrical ring body of the inner ring (1) and the cylindrical ring body of the outer ring (2) is controlled to be 0.001-0.04 mm. The disc ring body of the inner ring (1) and the disc ring body of the outer ring (2) are respectively provided with countersunk bolt holes. Countersunk bolts (8) are provided in the countersunk bolt holes. The surface of the countersunk bolts (8) is flush with the lower surface of the outer ring (2). The bolt head of the countersunk bolt (8) is placed in the L-shaped outer ring. The surface of the plug (6) is concave along its circumferential direction to form a groove (9), and an O-type sealing ring (10) is arranged in the groove (9); A layer of electrophoretic paint film is provided on the surfaces of the inner ring (1) and the outer ring (2).

2. The slewing bearing for the steering drive axle of a semitrailer according to claim 1, characterized in that: The inner ring (1) has a cylindrical ring body with a sealing groove at the upper edge of one side of the raceway for accommodating a sealing strip (4), and the outer ring (2) has a cylindrical ring body with a sealing groove at the lower edge of one side of the raceway for accommodating a sealing strip (4).

3. The slewing bearing for the steering drive axle of a semitrailer according to claim 1, characterized in that: The gap includes an axial gap between the cylindrical ring body of the inner ring (1) and the cylindrical ring body of the outer ring (2) controlled to be 0.001-0.04 mm, and a radial gap between the cylindrical ring body of the inner ring (1) and the cylindrical ring body of the outer ring (2) controlled to be 0.001-0.04 mm.

4. The slewing bearing for the steering drive axle of a semitrailer according to claim 1, characterized in that: The roughness Ra of the raceway is 0.4-0.8 um.

5. The slewing bearing for the steering drive axle of a semitrailer according to claim 1, characterized in that: Lubricating oil is arranged in the raceway, and the lubricating oil is BLR-M bearing grease.

6. The slewing bearing for the steering drive axle of a semitrailer according to claim 1, characterized in that: An isolation block is provided between two adjacent steel balls (5).

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