Stepless adjustable hub structure and tractor

Abstract

The utility model provides a stepless adjustable hub structure and tractor, stepless adjustable hub structure includes drive axle, hub cover, hub no. 1, hub no. 2, the hub cover is equipped with the conical mounting hole, hub no. 1 and hub no. 2 both extend into the mounting hole from the big end of mounting hole and with the hub cover through the fastener, the hub no. The first hub and the second hub are both semicircular and define an annular inner hub, and the outer wall of the inner hub is provided with an outer conical face capable of being matched with the inner wall of the mounting hole. A special-shaped transmission hole is formed in the middle of the inner hub, the driving shaft is special-shaped, and the transmission hole is matched with the driving shaft to form transmission connection. By the adoption of the hub assembly, the inner hub is in matched transmission with the driving shaft through the special-shaped transmission hole, the transmission capacity is improved, part of torque does not need to be transmitted by means of the holding friction force of the hub to the driving shaft, excessive holding between the hub and the driving shaft is avoided, and the disassembly and assembly difficulty and the wheel track adjustment difficulty are small.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery hub technology, specifically to a continuously adjustable hub structure and a tractor. Background Technology

[0002] Tractors, as agricultural power machinery, provide power to agricultural implements. The distance between the center points of the left and right wheels touching the ground on the same axle of a tractor is called the wheel track. Due to agronomic requirements, the wheel track of a tractor needs to be adjusted according to the specific agronomic conditions.

[0003] There are generally two ways to adjust the wheel track of a tractor: stepped adjustment, which allows for a fixed number of wheel track widths, is simple and low-cost, but cannot be continuously adjusted and has poor adaptability to various agronomic requirements; and stepless adjustment, which allows for adjustment of the wheel track within a certain range, better adapting to the agronomic requirements of inter-row cultivation, and is more widely used and popular with users.

[0004] The continuously adjustable wheel hub includes a hubcap and two semi-circular hubs, hub one and hub two. The inner hole on the hubcap is a frustoconical hole, and the outer surfaces of hub one and hub two are semi-conical surfaces. During assembly, after hub one and hub two are joined together, the conical surfaces formed by their outer surfaces mate with the frustoconical hole on the hubcap. Both hub one and hub two are pre-tightened to the hubcap via bolts and washers, thus forming an expansion sleeve structure that tightly grips the drive shaft. When the bolts and washers are loosened, the position can be adjusted along the axial direction of the drive shaft.

[0005] Because hub one and hub two are connected to the drive shaft via a key drive, which has limited capacity, the semi-conical surfaces of hub one and hub two have a smaller slope to withstand the tractor's enormous traction. This, combined with a larger preload on the bolt washers, increases the clamping force of hub one and hub two on the drive shaft, using friction to transmit some torque. This results in excessive clamping between the hub caps, hub one and hub two, and the drive shaft after prolonged use, making them difficult to remove. Utility Model Content

[0006] The technical problem to be solved by this utility model is: how to avoid excessive tightness between the wheel hub and the drive shaft.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] This utility model provides a continuously adjustable wheel hub structure, including a drive shaft, a hub cover, a first wheel hub, and a second wheel hub. The hub cover has a tapered mounting hole. Both the first and second wheel hubs extend into the mounting hole from the larger end and are connected to the hub cover by fasteners. The first and second wheel hubs are both semi-circular and together form an annular inner hub. The outer wall of the inner hub has an outer tapered surface that matches the inner wall of the mounting hole. The middle of the inner hub has an irregularly shaped transmission hole. The drive shaft is irregularly shaped, and the transmission hole cooperates with the drive shaft to form a transmission connection.

[0009] The beneficial effects of this utility model are:

[0010] This invention utilizes an inner hub that engages with the drive shaft via a specially shaped transmission hole, increasing the transmission area between the inner hub and the drive shaft and improving transmission capacity. It eliminates the need for frictional force between the hub and the drive shaft to transmit torque, preventing excessive clamping between the hub and the drive shaft, and simplifying disassembly, assembly, and wheelbase adjustment. The outer conical surface of the inner hub engages with the inner conical surface of the mounting hole, ensuring that hub one and hub two are firmly clamped onto the drive shaft during installation, achieving axial position fixation and good stability. Furthermore, hub one and hub two are easily separated from the hubcap when the fasteners are disassembled.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the inner wall of the transmission hole is provided with the same number of planar inner walls and multiple arc-shaped inner walls, with the planar inner walls and arc-shaped inner walls arranged alternately along the circumference of the transmission hole; the drive shaft is provided with multiple flat cuts, each flat cut corresponding to a planar inner wall.

[0013] The drive shaft can be formed by cutting a circular shaft with a flat cut, which is simple and convenient, reducing manufacturing costs. Through the cooperation between the flat cut and the inner wall of the plane, the transmission surface is evenly stressed, avoiding material crushing, resulting in good reliability and long service life.

[0014] Furthermore, the inner wall of the plane is uniformly distributed along the circumference of the transmission hole.

[0015] This facilitates the improvement of the uniformity of power transmission along the circumferential direction of the transmission hole, thereby increasing the transmission capacity.

[0016] Furthermore, the inner wall of the opening of hub one and the inner wall of the opening of hub two are both arc-shaped, and the inner walls of the openings of hub one and hub two are connected to each other to form two opposing arc-shaped inner walls.

[0017] By avoiding transmission at the opening between hub one and hub two, and instead transmitting power through the middle of hub one and hub two, stress concentration at the opening is avoided, thus improving transmission capacity.

[0018] Furthermore, there are two planar inner walls and two arc-shaped inner walls.

[0019] It is easy to process, low in cost, and easy to promote and use.

[0020] Furthermore, the mounting hole is conical, and the outer side of the portion of hub one and hub two that extends into the mounting hole is provided with a semi-conical surface, the taper of which is the same as the taper of the mounting hole.

[0021] The semi-conical surfaces of hub one and hub two form an outer conical surface that matches the inner wall of the mounting hole. During installation, the outer conical surface fits tightly against the inner wall of the mounting hole, effectively constraining the inner hub's grip on the drive shaft. The gripping force is evenly distributed on the inner wall of the mounting hole, avoiding stress concentration that could lead to jamming. This makes disassembly and assembly convenient.

[0022] Furthermore, both the portion of hub one located outside the mounting hole and the portion of hub two located outside the mounting hole are provided with flange edges, which are connected to the hub cover by fasteners.

[0023] It offers strong connection strength and high reliability; at the same time, it keeps the fasteners away from the drive shaft, making disassembly and assembly convenient.

[0024] Furthermore, the end of the hub cover is provided with a groove, and when hub one and hub two extend into the mounting hole, the flange edge extends into the groove.

[0025] This design facilitates a flush fit between the hubcap and the inner hub, resulting in a compact structure and reduced difficulty in bolt protection.

[0026] Furthermore, the hubcap is also provided with a flange, which can be used to connect to the tire by bolts.

[0027] Easy to install tires, convenient installation.

[0028] This utility model also provides a tractor, including a body, the rear axle half shaft of the body is provided with the above-mentioned continuously adjustable hub structure, and a tire is provided on the hub cover.

[0029] It eliminates the need for friction between the wheel hub and the drive shaft to transmit some torque, avoiding excessive tension between the wheel hub and the drive shaft, and making disassembly, assembly, and track adjustment easier. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 This is a schematic diagram of the structure of hub one.

[0032] Figure 3 This is a structural diagram of the present invention in its installed state.

[0033] Figure 4 This is a schematic diagram of the tractor of this utility model.

[0034] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0035] 1-Drive shaft; 2-Hub cap; 3-Hub 1; 4-Hub 2; 5-Flat inner wall; 6-Arc inner wall; 7-Flat cut; 8-Flange edge; 9-Groove; 10-Flange; 11-Vehicle body. Detailed Implementation

[0036] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0037] This utility model refers to Figure 1-4 .

[0038] This utility model provides a continuously adjustable wheel hub structure, including a drive shaft 1, a hub cover 2, a first hub 3, and a second hub 4. The hub cover 2 has a tapered mounting hole. The first hub 3 and the second hub 4 both extend into the mounting hole from the larger end and are connected to the hub cover 2 by fasteners. The first hub 3 and the second hub 4 are both semi-circular and together form an annular inner hub. The outer wall of the inner hub has an outer tapered surface that matches the inner wall of the mounting hole. The middle of the inner hub has an irregularly shaped transmission hole. The drive shaft 1 is irregularly shaped, and the transmission hole cooperates with the drive shaft 1 to form a transmission connection.

[0039] principle:

[0040] During installation, the hubcap 2 is fitted onto the drive shaft 1. Wheel hub 3 and wheel hub 4 extend into the mounting holes of the hubcap 2 and close together to form an inner hub. With the outer conical surface of the inner hub engaging with the inner conical surface of the mounting hole, wheel hub 3 and wheel hub 4 approach each other until they are firmly clamped onto the drive shaft 1. Then, fasteners are used to secure wheel hub 3 and wheel hub 4 to the hubcap 2. At this point, under the clamping force, wheel hub 3, wheel hub 4, and hubcap 2 cannot move. When the fasteners are removed, wheel hub 3 and wheel hub 4 can be slightly moved out of the mounting holes, thus eliminating the clamping force and allowing for axial adjustment to adjust the wheel track.

[0041] The inner hub has an irregularly shaped transmission hole in the center. "Irregularly shaped" means non-circular, such as rectangular, elliptical, or splined. The inner hub engages with the drive shaft 1 through this hole, increasing the transmission area between the inner hub and drive shaft 1. This facilitates the transmission of the tractor's high traction force, eliminating the need for friction to transmit torque. At this point, the clamping force of hub 3 and hub 4 on drive shaft 1 is only used to constrain their position on drive shaft 1, requiring less clamping force. Simultaneously, the semi-conical surface slope of hub 3 and hub 4 can be appropriately increased, making it easier to separate hub 3 and hub 4 from the hub cap 2 when the fasteners are removed.

[0042] In summary, by adopting this utility model, the inner hub engages with the drive shaft 1 through a specially shaped transmission hole, increasing the transmission area between the inner hub and the drive shaft 1 and improving the transmission capacity. It eliminates the need for the hub to rely on frictional force to grip the drive shaft 1 to transmit some torque, avoiding excessive gripping between the hub and the drive shaft 1, and simplifying disassembly, assembly, and wheel track adjustment. Through the engagement of the outer conical surface of the inner hub with the inner conical surface of the mounting hole, hub 3 and hub 4 are tightly gripped on the drive shaft 1 during installation, achieving axial position fixation and good stability. When disassembling the fasteners, hub 3 and hub 4 are easily separated from the hub cap 2.

[0043] Furthermore, the inner wall of the transmission hole is provided with the same number of planar inner walls 5 and arc-shaped inner walls 6, with the planar inner walls 5 and arc-shaped inner walls 6 arranged alternately along the circumference of the transmission hole; the drive shaft 1 is provided with multiple flat cuts 7, each flat cut 7 corresponding to a planar inner wall 5.

[0044] The drive shaft 1 can be formed by machining a flat cut 7 from a circular shaft. The process is simple and convenient, which reduces the manufacturing cost. The transmission is achieved by the flat cut 7 cooperating with the inner wall 5 of the plane. The transmission surface is evenly stressed, which avoids material crushing, resulting in good reliability and long service life.

[0045] Furthermore, the inner wall 5 of the plane is uniformly distributed along the circumference of the transmission hole.

[0046] This facilitates the improvement of the uniformity of power transmission along the circumferential direction of the transmission hole, thereby increasing the transmission capacity.

[0047] Furthermore, the inner wall of the opening of hub 3 and the inner wall of the opening of hub 4 are both arc-shaped, and the inner walls of the opening of hub 3 and hub 4 are connected to each other to form two opposing arc-shaped inner walls 6.

[0048] Transmission is avoided at the opening between hub 3 and hub 4. Instead, transmission occurs through the middle of hub 3 and hub 4, preventing stress concentration at the opening and improving transmission capacity.

[0049] Furthermore, there are two of each of the planar inner wall 5 and the arc-shaped inner wall 6.

[0050] It is easy to process, low in cost, and easy to promote and use.

[0051] Furthermore, the mounting hole is conical, and the outer side of the portion of the hub 3 and hub 4 that extends into the mounting hole is provided with a semi-conical surface, the taper of which is the same as the taper of the mounting hole.

[0052] The semi-conical surfaces of hub 3 and hub 4 form an outer conical surface that matches the inner wall of the mounting hole. During installation, the outer conical surface fits tightly against the inner wall of the mounting hole, effectively constraining the inner hub's grip on the drive shaft 1. The gripping force is evenly distributed on the inner wall of the mounting hole, avoiding stress concentration that could lead to jamming. This makes disassembly and assembly convenient.

[0053] Furthermore, both the portion of hub 3 outside the mounting hole and the portion of hub 4 outside the mounting hole are provided with flange edges 8, which are connected to the hub cover 2 by fasteners.

[0054] Preferably, the fastener is a bolt with a washer. This allows for adjustment of the clamping force of the inner hub on the drive shaft 1 by adding or removing shims.

[0055] It has high connection strength and good reliability; at the same time, it keeps the fasteners away from the drive shaft 1, making disassembly and assembly convenient.

[0056] Furthermore, the end of the hub cover 2 is provided with a groove 9, and when the hub 3 and hub 4 are inserted into the mounting hole, the flange edge 8 is inserted into the groove 9.

[0057] This design facilitates a flush fit between the hubcap 2 and the inner hub, resulting in a compact structure and reduced difficulty in bolt protection.

[0058] Furthermore, the hubcap 2 is also provided with a flange 10, which can be used to connect to the tire by bolts.

[0059] Easy to install tires, convenient installation.

[0060] like Figure 4 As shown: This utility model also provides a tractor, including a body 11, the rear axle half shaft of the body 11 is provided with the above-mentioned continuously adjustable wheel hub structure, and the wheel hub cover 2 is provided with a tire.

[0061] Note: The rear axle half-shaft is an existing technology structure, namely the drive shaft 1 on the rear axle.

[0062] It does not require the frictional force of the wheel hub to grip the drive shaft 1 to transmit part of the torque, thus avoiding excessive grip between the wheel hub and the drive shaft 1, and making disassembly, assembly, and track adjustment easier.

[0063] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0064] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0066] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0067] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A continuously adjustable wheel hub structure, characterized in that: The device includes a drive shaft (1), a hub cover (2), a first hub (3), and a second hub (4). The hub cover (2) has a tapered mounting hole. The first hub (3) and the second hub (4) both extend into the mounting hole from the larger end and are connected to the hub cover (2) by fasteners. The first hub (3) and the second hub (4) are both semi-circular and enclose to form an annular inner hub. The outer wall of the inner hub has an outer tapered surface that matches the inner wall of the mounting hole. The middle part of the inner hub has an irregularly shaped transmission hole. The drive shaft (1) is irregularly shaped, and the transmission hole cooperates with the drive shaft (1) to form a transmission connection.

2. The continuously adjustable hub structure according to claim 1, characterized in that: The inner wall of the transmission hole is provided with the same number of planar inner walls (5) and arc-shaped inner walls (6), and the planar inner walls (5) and arc-shaped inner walls (6) are arranged alternately along the circumference of the transmission hole; the drive shaft (1) is provided with multiple flat cuts (7), and each flat cut (7) is arranged corresponding to a planar inner wall (5).

3. The continuously adjustable hub structure according to claim 2, characterized in that: The inner wall (5) of the plane is evenly distributed along the circumference of the transmission hole.

4. The continuously adjustable hub structure according to claim 3, characterized in that: The inner wall of the opening of hub one (3) and the inner wall of the opening of hub two (4) are both arc-shaped. The inner wall of the opening of hub one (3) and the inner wall of the opening of hub two (4) are connected to each other to form two opposing arc-shaped inner walls (6).

5. The continuously adjustable hub structure according to claim 4, characterized in that: The number of planar inner walls (5) and arc-shaped inner walls (6) are both two.

6. The continuously adjustable hub structure according to claim 1, characterized in that: The mounting hole is conical, and the outer side of the portion of hub one (3) and hub two (4) that extends into the mounting hole is provided with a semi-conical surface, the taper of the semi-conical surface being the same as the taper of the mounting hole.

7. The continuously adjustable hub structure according to claim 6, characterized in that: The portion of hub one (3) outside the mounting hole and the portion of hub two (4) outside the mounting hole are both provided with flange edges (8), and the flange edges (8) are connected to the hub cover (2) by fasteners.

8. The continuously adjustable hub structure according to claim 7, characterized in that: The end of the hub cover (2) is provided with a groove (9). When hub one (3) and hub two (4) are inserted into the mounting hole, the flange edge (8) is inserted into the groove (9).

9. The continuously adjustable hub structure according to claim 1, characterized in that: The hubcap (2) is also provided with a flange (10), which can be used to connect to the tire by bolts.

10. A tractor, comprising a chassis (11), characterized in that: The rear axle half-shaft of the vehicle body (11) is provided with a continuously adjustable hub structure as described in any one of claims 1-9, and a tire is provided on the hub cover (2).

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