Slewing support bearing and tractor with same

Abstract

The utility model relates to a slewing bearing and a tractor with the same. The slewing bearing comprises an annular bearing seat, a circular driving disc and a circular driven disc, an annular shaft shoulder is arranged in the middle of the inner wall of the bearing seat, the driving disc and the driven disc are coaxially arranged in the bearing seat, and the driving disc and the driven disc are distributed at the upper end and the lower end of the shaft shoulder respectively. An annular first ball cavity is defined among the outer edge of the driving disc, the inner wall of the bearing seat and the shaft shoulder, an annular second ball cavity is defined among the outer edge of the driven disc, the inner wall of the bearing seat and the shaft shoulder, first steel balls are arranged in the first ball cavity, and second steel balls are arranged in the second ball cavity. The driving disc and the driven disc are connected and fixed through a fastener, and the diameter of the first steel balls is smaller than that of the second steel balls. The asymmetric double-row ball slewing bearing has the advantages that the strength and the reliability of the slewing bearing are improved, and meanwhile, the self-lubricating performance and the sealing performance of the bearing are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery accessories, in particular to a slewing bearing and a tractor having the same. Background Art

[0002] The front wheel steering structure of agricultural tractors mostly uses a trapezoidal steering structure. The trapezoidal steering mechanism is activated by the steering rod to achieve synchronous linkage of the two steering wheels to drive the tractor to steer. This steering mechanism is only suitable for four-wheel mechanisms and not for single steering wheel structures.

[0003] For three-wheeled motor vehicles with front-wheel guidance, the steering mechanism mostly adopts a vertical shaft sleeve type structure, and two bearings are respectively installed between the vertical shaft and the sleeve. On the one hand, the operation is not flexible, the rigidity of the steering mechanism is small, and the operability and reliability are reduced under heavy loads. On the other hand, due to the relatively large axial dimension of the vertical shaft sleeve type structure, it cannot be used for field operations and is therefore not suitable for the front steering mechanism of a three-wheeled tractor.

[0004] The steering mechanism of three-wheel tractors with front-wheel steering generally uses a rack-and-pinion structure. The steering gear is integrated with the steering shaft. When the driver turns the steering wheel, the steering gear rotates accordingly, meshing with the steering rack, causing the rack to move axially. The rack movement is transmitted to the steering knuckle arm via the steering tie rod, thereby deflecting the wheel and achieving steering. This structure has a high reverse efficiency. When the vehicle is driving on uneven roads, most of the impact force between the steering wheel and the road surface is transferred to the steering wheel, making it difficult for the driver to accurately control the vehicle's direction.

[0005] At present, three-wheel tractors often use a steering mechanism in which a cylinder drives the steering bearing to drive the front guide wheel to steer. When the tractor is under heavy load, the steering bearing bears a large load and overturning moment, and the steel ball is easily damaged, causing steering jamming and affecting the steering performance of the tractor.

[0006] Based on this, it is necessary to develop a slewing bearing and a tractor having the same to overcome the above technical problems. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a slewing bearing and a tractor having the same, which effectively overcomes the defects of the prior art.

[0008] The technical solution of the utility model to solve the above technical problems is as follows:

[0009] A slewing bearing comprises an annular bearing seat, a circular active disc and a circular driven disc, a circular shoulder being provided in the middle portion of the inner wall of the bearing seat, the active disc and the driven disc being coaxially arranged in the bearing seat, the active disc and the driven disc being distributed at the upper and lower ends of the shoulder, a first annular ball cavity being defined between the outer edge of the active disc and the inner wall of the bearing seat and the shoulder, a second annular ball cavity being defined between the outer edge of the driven disc and the inner wall of the bearing seat and the shoulder, a first steel ball being housed in the first ball cavity, a second steel ball being housed in the second ball cavity, the active disc and the driven disc being connected and fixed by fasteners, the diameter of the first steel ball being smaller than the diameter of the second steel ball.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, a first annular notch with an arc-shaped cross section is provided on the outer edge of the lower end of the above-mentioned active disk, and a first annular groove with an arc-shaped cross section is formed at the connection between the upper part of the above-mentioned shoulder and the inner wall of the bearing seat. The above-mentioned first annular notch and the first annular groove together form the above-mentioned first ball cavity. A second annular notch with an arc-shaped cross section is provided on the outer edge of the upper end of the above-mentioned driven disk, and a second annular groove with an arc-shaped cross section is formed at the connection between the lower part of the above-mentioned shoulder and the inner wall of the bearing seat. The above-mentioned second annular notch and the second annular groove together form the above-mentioned second ball cavity.

[0012] Furthermore, the lower end of the active disc and the upper end of the driven disc are respectively configured as stepped surfaces that fit into each other, and an adjustment gasket is sandwiched between the stepped surfaces of the active disc and the driven disc.

[0013] Furthermore, a first sealing ring is embedded in the upper periphery of the driving disc and is in sealing contact with the inner wall of the bearing seat, and a second sealing ring is embedded in the lower periphery of the driven disc and is in sealing contact with the inner wall of the bearing seat.

[0014] Furthermore, a first dust cover is detachably mounted on the upper end of the active disc and the upper end of the bearing seat, and a second dust cover is detachably mounted on the lower end of the driven disc and the lower end of the bearing seat.

[0015] Furthermore, an upper convex ring is provided on the outer edge of the upper end of the above-mentioned active disk, and a first sealing ring groove is provided on the outer periphery of the upper end of the above-mentioned bearing seat. The above-mentioned first dust cover covers the upper convex ring and the upper end of the bearing seat, and one end of the above-mentioned first dust cover is engaged with the inner ring of the above-mentioned upper convex ring, and the other end of the above-mentioned first dust cover is engaged with the above-mentioned first sealing ring groove. The lower end outer edge of the above-mentioned driven disk is provided with a lower convex ring, and a second sealing ring groove is provided on the outer periphery of the lower end of the above-mentioned bearing seat. The above-mentioned second dust cover covers the above-mentioned lower convex ring and the lower end of the bearing seat, and one end of the above-mentioned second dust cover is engaged with the inner ring of the above-mentioned lower convex ring, and the other end of the above-mentioned second dust cover is engaged with the above-mentioned second sealing ring groove.

[0016] Furthermore, two opposite sides of the driving disk and the driven disk are provided with corresponding positioning holes along the axial direction, and positioning pins are respectively inserted into the positioning holes.

[0017] Furthermore, the above-mentioned fasteners include multiple fastening bolts, and the lower end of the above-mentioned driven disk is provided with multiple countersunk holes along its circumferential intervals, and the above-mentioned active disk is provided with multiple screw holes corresponding to the above-mentioned countersunk holes along its circumferential intervals. The multiple fastening bolts respectively pass through the multiple countersunk holes from bottom to top, penetrate into the corresponding screw holes, and screw together.

[0018] Furthermore, steering columns are symmetrically provided on both sides of the upper end of the driving disc.

[0019] The beneficial effects of the utility model are: simple and reasonable structural design, asymmetric double-row ball slewing bearing, improved strength and reliability of the slewing bearing, better adaptation to heavy-load operation of three-wheel tractors, while improving the lubrication and sealing performance of the bearing itself, improving steering flexibility, and greatly reducing the installation space of the tractor steering mechanism.

[0020] A three-wheel tractor is also provided, including a slewing bearing BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural cross-sectional view of the slewing bearing of the utility model;

[0022] Figure 2 This is a top view of the structure of the slewing bearing of the present invention.

[0023] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0024] 1. Bearing seat; 2. Driving plate; 3. Driven plate; 4. First steel ball; 5. Second steel ball; 6. Adjusting gasket; 7. First dust cover; 8. Second dust cover; 9. Locating pin; 10. Fastening bolt; 11. Shoulder; 21. First sealing ring; 22. Upper cam; 24. Steering column; 31. Second sealing ring; 32. Lower cam. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] Example 1

[0027] like Figure 1 and 2As shown, the slewing bearing of this embodiment includes an annular bearing seat 1, a circular active disc 2 and a circular driven disc 3. A circular shoulder 11 is provided in the middle part of the inner wall of the bearing seat 1. The active disc 2 and the driven disc 3 are coaxially arranged in the bearing seat 1 respectively. The active disc 2 and the driven disc 3 are respectively distributed at the upper and lower ends of the shoulder 11. A first annular ball cavity is defined between the outer edge of the active disc 2 and the inner wall of the bearing seat 1 and the shoulder 11. A second annular ball cavity is defined between the outer edge of the driven disc 3 and the inner wall of the bearing seat 1 and the shoulder 11. A first steel ball 4 is installed in the first ball cavity, and a second steel ball 5 is installed in the second ball cavity. The active disc 2 and the driven disc 3 are connected and fixed by fasteners. The diameter of the first steel ball 4 is smaller than the diameter of the second steel ball 5.

[0028] In the slewing bearing of this embodiment, the bearing seat 1 is used to be installed on the frame. The bearing seat 1 is located between the driving disc 2 and the driven disc 3, and has a shaft shoulder 11 in the middle to limit the upper and lower steel balls. The upper and lower steel balls adopt an asymmetric structure. The second steel ball 5 with a larger diameter at the bottom is mainly used to bear the load. During the assembly process, grease is filled in the first ball cavity and the second ball cavity to ensure that the slewing bearing rotates flexibly and reliably. The overall structural design is simple and reasonable. The asymmetric double-row ball slewing bearing improves the strength and reliability of the slewing bearing, better adapts to the heavy-load operation of three-wheel tractors, and at the same time improves the lubrication and sealing performance of the bearing itself, improves the steering flexibility, and greatly reduces the installation space of the tractor steering mechanism.

[0029] In this embodiment, the lower outer edge of the active disk 2 is provided with a first annular notch with an arc-shaped cross section, the connection between the upper portion of the shaft shoulder 11 and the inner wall of the bearing seat 1 forms a first annular groove with an arc-shaped cross section, and the first annular notch and the first annular groove together form the first ball cavity. The upper outer edge of the driven disk 3 is provided with a second annular notch with an arc-shaped cross section, the connection between the lower portion of the shaft shoulder 11 and the inner wall of the bearing seat 1 forms a second annular groove with an arc-shaped cross section, and the second annular notch and the second annular groove together form the second ball cavity. The first annular notch and the first annular groove together form the first ball cavity with a cross section that is approximately circular, and the second annular notch and the second annular groove together form the second ball cavity with a cross section that is approximately circular, which facilitates the flexible rotation of the balls in the two cavities.

[0030] In this embodiment, the lower end of the active disk 2 and the upper end of the driven disk 3 are each configured with interlocking stepped surfaces, with an adjustment spacer 6 interposed between the stepped surfaces of the active and driven disks 2 and 3. This stepped surface design facilitates the positioning and engagement between the ends of the active and driven disks 2 and 3, improving sealing performance to a certain extent. Furthermore, the design of the adjustment spacer 6 facilitates adjustment of the circumferential clearance of the bearings.

[0031] In this embodiment, a first sealing ring 21 is embedded in the upper portion of the outer periphery of the driving disc 2, in sealing contact with the inner wall of the bearing seat 1. A second sealing ring 31 is embedded in the lower portion of the outer periphery of the driven disc 3, in sealing contact with the inner wall of the bearing seat 1. The first sealing ring 21 improves the sealing performance between the driving disc 2 and the bearing seat 1, ensuring that lubricating grease does not leak. At the same time, the second sealing ring 31 also improves the sealing performance between the driven disc 3 and the bearing seat 1, ensuring good rolling performance of the first and second steel ball bearings 4 and 5.

[0032] In this embodiment, a first dust cover 7 is removably mounted on the upper end of the driving plate 2 and the upper end of the bearing seat 1, and a second dust cover 8 is removably mounted on the lower end of the driven plate 3 and the lower end of the bearing seat 1. The design of the first dust cover 7 and the second dust cover 8 effectively prevents dust from entering the first and second ball cavities, while also preventing pollutants such as rainwater from entering the plane bearings, thereby ensuring the service life of the plane bearings.

[0033] In this embodiment, an upper convex ring 22 is provided on the outer edge of the upper end of the above-mentioned active disk 2, and a first sealing ring groove is provided on the outer periphery of the upper end of the above-mentioned bearing seat 1. The above-mentioned first dust cover 7 covers the above-mentioned upper convex ring 22 and the upper end of the bearing seat 1, and one end of the above-mentioned first dust cover 7 is engaged with the inner ring of the above-mentioned upper convex ring 22, and the other end of the above-mentioned first dust cover 7 is engaged with the above-mentioned first sealing ring groove. The lower end outer edge of the above-mentioned driven disk 3 is provided with a lower convex ring 32, and a second sealing ring groove is provided on the outer periphery of the lower end of the above-mentioned bearing seat 1. The above-mentioned second dust cover 8 covers the above-mentioned lower convex ring 32 and the lower end of the bearing seat 1, and one end of the above-mentioned second dust cover 8 is engaged with the inner ring of the above-mentioned lower convex ring 32, and the other end of the above-mentioned second dust cover 8 is engaged with the above-mentioned second sealing ring groove. Among them, the design of the upper convex ring 22 and the first sealing groove enables the two end edges of the annular first dust cover 7 to be respectively stuck in the inner ring of the upper convex ring 22 and the first sealing ring groove, ensuring that the first dust cover 7 is installed firmly. Similarly, the design of the lower convex ring 32 and the second sealing groove enables the first dust cover 7 to be installed firmly, playing a better role in dustproof, waterproof and anti-pollutant.

[0034] As a preferred embodiment, two opposite sides of the driving disc 2 and the driven disc 3 are provided with corresponding positioning holes along the axial direction, and positioning pins 9 are respectively inserted into the positioning holes.

[0035] In the above embodiment, the design of the positioning pin 9 and the positioning hole can facilitate the adjustment of the radial clearance of the bearing.

[0036] In this embodiment, the fasteners include multiple fastening bolts 10. The driven plate 3 has multiple countersunk holes spaced circumferentially at its lower end, and the driving plate 2 has multiple screw holes spaced circumferentially corresponding to the countersunk holes. The fastening bolts 10 are passed through the countersunk holes from bottom to top, each correspondingly, and screwed into the corresponding screw holes. After the radial clearance is adjusted, the fastening bolts 10 are tightened to secure the assembly.

[0037] In this embodiment, steering columns 24 are symmetrically provided on both sides of the upper end of the driving plate 2. The steering columns 24 are symmetrically welded to the driving plate 2 and are used to assemble the cylinder fixing bolts. The oil cylinder drives the steering columns 24 to rotate the driving plate 2 and the driven plate 3, achieving steering. The design of the steering columns 24 facilitates assembly with the steering mechanism.

[0038] Example 2

[0039] The three-wheel tractor of this embodiment includes the slewing bearing in Embodiment 1, and the slewing bearing is applied in the slewing bearing of the three-wheel tractor.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A slewing bearing, characterized in that: The invention comprises an annular bearing seat (1), a circular active disk (2) and a circular driven disk (3), wherein an annular shaft shoulder (11) is provided in the middle of the inner wall of the bearing seat (1), the active disk (2) and the driven disk (3) are respectively coaxially arranged in the bearing seat (1), the active disk (2) and the driven disk (3) are respectively distributed at the upper and lower ends of the shaft shoulder (11), a first annular ball cavity is defined between the outer edge of the active disk (2) and the inner wall of the bearing seat (1) and the shaft shoulder (11), a second annular ball cavity is defined between the outer edge of the driven disk (3) and the inner wall of the bearing seat (1) and the shaft shoulder (11), a first steel ball (4) is installed in the first ball cavity, and a second steel ball (5) is installed in the second ball cavity, the active disk (2) and the driven disk (3) are connected and fixed by fasteners, and the diameter of the first steel ball (4) is smaller than the diameter of the second steel ball (5).

2. The slewing bearing according to claim 1, characterized in that: The outer edge of the lower end of the active disk (2) is provided with a first annular notch with an arc-shaped cross section, and the connection between the upper part of the shaft shoulder (11) and the inner wall of the bearing seat (1) forms a first annular groove with an arc-shaped cross section, and the first annular notch and the first annular groove together form the first ball cavity, and the outer edge of the upper end of the driven disk (3) is provided with a second annular notch with an arc-shaped cross section, and the connection between the lower part of the shaft shoulder (11) and the inner wall of the bearing seat (1) forms a second annular groove with an arc-shaped cross section, and the second annular notch and the second annular groove together form the second ball cavity.

3. The slewing bearing according to claim 1, characterized in that: The lower end of the active disk (2) and the upper end of the driven disk (3) are respectively provided with mutually engaged step surfaces, and an adjustment gasket (6) is sandwiched between the step surfaces of the active disk (2) and the driven disk (3).

4. The slewing bearing according to claim 1, characterized in that: A first sealing ring (21) is embedded in the upper outer periphery of the active disc (2) and is in sealing contact with the inner wall of the bearing seat (1), and a second sealing ring (31) is embedded in the lower outer periphery of the driven disc (3) and is in sealing contact with the inner wall of the bearing seat (1).

5. The slewing bearing according to claim 1, characterized in that: A first dust cover (7) is detachably mounted on the upper end of the active disk (2) and the upper end of the bearing seat (1), and a second dust cover (8) is detachably mounted on the lower end of the driven disk (3) and the lower end of the bearing seat (1).

6. The slewing bearing according to claim 5, characterized in that: The outer edge of the upper end of the active disk (2) is provided with an upper convex ring (22), the outer periphery of the upper end of the bearing seat (1) is provided with a first sealing ring groove, the first dust cover (7) covers the upper convex ring (22) and the upper end of the bearing seat (1), and one end of the first dust cover (7) is engaged with the inner ring of the upper convex ring (22), and the other end of the first dust cover (7) is engaged with the first sealing ring groove, the outer edge of the lower end of the driven disk (3) is provided with a lower convex ring (32), the outer periphery of the lower end of the bearing seat (1) is provided with a second sealing ring groove, the second dust cover (8) covers the lower convex ring (32) and the lower end of the bearing seat (1), and one end of the second dust cover (8) is engaged with the inner ring of the lower convex ring (32), and the other end of the second dust cover (8) is engaged with the second sealing ring groove.

7. The slewing bearing according to claim 1, characterized in that: One-to-one corresponding positioning holes are respectively provided on opposite sides of the driving disk (2) and the driven disk (3) along the axial direction, and positioning pins (9) are respectively inserted into the positioning holes.

8. The slewing bearing according to claim 7, characterized in that: The fastener comprises a plurality of fastening bolts (10), a plurality of countersunk holes are provided at intervals along the circumference of the lower end of the driven disk (3), a plurality of screw holes corresponding to the countersunk holes are provided at intervals along the circumference of the upper end of the active disk (2), and the plurality of fastening bolts (10) pass through the plurality of countersunk holes from bottom to top in a corresponding manner, penetrate into the corresponding screw holes, and are screwed together.

9. The slewing bearing according to any one of claims 1 to 8, characterized in that: Steering columns (24) are symmetrically provided on both sides of the upper end of the driving disc (2).

10. A three-wheel tractor, characterized by: The invention comprises a slewing bearing according to any one of claims 1 to 9.

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