Agricultural machinery chain wheel with high connection strength

Abstract

The utility model relates to an agricultural machinery chain wheel with high connection strength, which comprises a chain wheel main body consisting of a wheel disc and a plurality of wheel teeth, and further comprises a bushing, the center of the wheel disc protrudes to form a boss, a rotating shaft connecting hole penetrating through the boss and the wheel disc is formed in the middle of the boss, and the bushing is inserted into the rotating shaft connecting hole and is fixedly connected with the rotating shaft connecting hole in a pressing manner. At least one first key groove is formed in the outer wall of the boss, at least one second key groove is formed in the outer wall of the bush, and the first key grooves and the second key grooves are distributed in an aligned mode. The high-strength steel lining is inserted into the rotating shaft connecting hole in the center of the wheel disc and fixedly connected with the rotating shaft connecting hole in a pressing mode, so that the surface hardness of the connecting position of the chain wheel and the rotating shaft is larger than that of a chain wheel body, and abrasion of the contact area of the chain wheel and the rotating shaft can be reduced; contact stress is homogenized, and stress concentration is reduced.

Description

Technical Field

[0001] This utility model relates to the field of sprocket technology, specifically to an agricultural machinery sprocket with high connection strength. Background Technology

[0002] Sprockets, as key transmission components, are widely used in agricultural machinery such as tractors and combine harvesters. A typical sprocket consists of a disc and teeth, with a shaft connection hole in the center of the disc for connecting to a shaft, allowing the sprocket to rotate.

[0003] In actual use, agricultural machinery sprockets need to withstand large torque, impact loads, and frequent start-stop operations. This makes the connection between the sprocket and the shaft prone to wear, deformation, or even breakage, which can easily affect the normal operation of the machinery. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] This invention provides a high-strength agricultural machinery sprocket, solving the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-strength agricultural machinery sprocket, comprising a sprocket body composed of a disc and multiple teeth, and a bushing. A boss protrudes from the center of the disc, and a shaft connection hole is formed in the middle of the boss, penetrating the boss and the disc. The bushing is inserted into the shaft connection hole and pressed to it. At least one first keyway is formed on the outer wall of the boss, and at least one second keyway is formed on the outer wall of the bushing. Several first keyways and several second keyways are aligned with each other, and a key is inserted in each coaxially aligned first keyway and second keyway to connect the shaft to the sprocket body and the bushing.

[0008] Preferably, the bushing includes a shaft hole reinforcing sleeve and a positioning ring, the positioning ring being formed on the end face of the shaft hole reinforcing sleeve, and both the shaft hole reinforcing sleeve and the positioning ring having through deformation slots.

[0009] In a further preferred embodiment, a positioning groove is formed on the inner wall of the end of the boss away from the wheel disk. The shape and size of the positioning ring are adapted to the positioning groove. The shaft hole reinforcing sleeve is inserted into the shaft connecting hole by the positioning ring. The end face of the positioning ring facing away from the shaft hole reinforcing sleeve is coplanar with the end face of the boss facing away from the wheel disk.

[0010] In a further preferred embodiment, the bushing is integrally constructed as a 42CrMo quenched steel bushing.

[0011] In a further preferred embodiment, the connection between the boss and the wheel is further provided with a number of reinforcing ribs.

[0012] (III) Beneficial Effects

[0013] Compared with the prior art, this utility model provides an agricultural machinery sprocket with high connection strength, which has the following beneficial effects:

[0014] In this invention, a high-strength steel bushing is inserted and pressurized into the shaft connection hole at the center of the sprocket, so that the surface hardness at the connection between the sprocket and the shaft is greater than the surface hardness of the sprocket body. This reduces wear in the contact area between the sprocket and the shaft. Furthermore, the bushing installed in the shaft connection hole by interference fit can form a continuous compressive stress layer with the hole wall, homogenizing the contact stress and reducing stress concentration.

[0015] In addition, the combination of the boss at the center of the sprocket and the reinforcing ribs can improve the structural strength of the connection between the sprocket and the drive shaft, and reduce the impact on the stability of the drive shaft caused by deformation and cracking of the shaft hole due to excessive load. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a high-strength agricultural machinery sprocket according to the implementation plan;

[0017] Figure 2 This is a structural schematic diagram of the sprocket body according to the implementation plan;

[0018] Figure 3 This is a structural schematic diagram of the bushing according to the implementation plan.

[0019] In the diagram: 10. Sprocket body; 11. Sprocket disc; 12. Sprocket tooth; 13. Boss; 14. Shaft connection hole; 15. Positioning groove; 16. First keyway; 17. Reinforcing rib; 20. Bushing; 21. Shaft hole reinforcing sleeve; 22. Positioning ring; 23. Deformation slot; 24. Second keyway. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1A high-strength agricultural machinery sprocket includes a sprocket body 10 composed of a disc 11 and multiple teeth 12, and a bushing 20. A boss 13 protrudes from the center of the disc 11, and a shaft connection hole 14, penetrating the boss 13 and the disc 11, is formed in the middle of the boss 13. The bushing 20 is inserted into the shaft connection hole 14 and press-fitted thereto. When assembling the shaft with the agricultural machinery sprocket, the shaft can be inserted into the bushing 20. At least one first keyway 16 is formed on the outer wall of the boss 13, and at least one second keyway 24 is formed on the outer wall of the bushing 20. Several first keyways 16 and several second keyways 24 are aligned and distributed with each other. After the shaft is inserted into the bushing 20, a key can be inserted into each coaxially aligned first keyway 16 and second keyway 24 to connect and fix the shaft to the sprocket body 10 and the bushing 20, thus completing the connection and assembly of the agricultural machinery sprocket and the shaft.

[0022] See Figure 2 A positioning groove 15 is formed on the inner wall of the end of the boss 13 away from the wheel 11. The positioning groove 15 is used to cooperate with the positioning and installation of the bushing 20. Several reinforcing ribs 17 are also formed at the connection between the boss 13 and the wheel 11. The reinforcing ribs 17 are used to help enhance the mechanical strength of the boss 13 and reduce the impact on the stability of the transmission shaft caused by deformation and cracking of the shaft hole due to excessive load.

[0023] See Figure 3 The bushing 20 includes a shaft hole reinforcing sleeve 21 and a positioning ring 22, and the bushing 20 as a whole can be made of 42CrMo high-strength alloy steel and 42CrMo quenched steel sleeve. The positioning ring 22 is formed on the end face of the shaft hole reinforcing sleeve 21, and the shape and size of the positioning ring 22 are adapted to the positioning groove 15, so that when the bushing 20 is pressed into the shaft connecting hole 14, the shaft hole reinforcing sleeve 21 can be inserted into the shaft connecting hole 14 in a limited manner by the positioning ring 22. After pressing, the end face of the positioning ring 22 facing away from the shaft hole reinforcing sleeve 21 is coplanar with the end face of the boss 13 facing away from the wheel disk 11. Both the shaft hole reinforcing sleeve 21 and the positioning ring 22 have through deformation slots 23, so that when the bushing 20, which has an interference fit with the shaft connecting hole 14, is pressed into it, it can generate a certain deformation through the deformation slots 23 to avoid interference. By inserting and pressing a high-strength steel bushing into the shaft connection hole at the center of the sprocket, the surface hardness at the connection between the sprocket and the shaft can be made greater than the surface hardness of the sprocket body. This can reduce wear in the contact area between the sprocket and the shaft. Furthermore, the bushing installed in the shaft connection hole through an interference fit can form a continuous compressive stress layer with the hole wall, homogenizing the contact stress and reducing stress concentration.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be 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 be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength agricultural machinery sprocket, comprising a sprocket body (10) consisting of a sprocket disc (11) and multiple gear teeth (12), characterized in that, It also includes a bushing (20). A boss (13) is formed protruding from the center of the wheel (11). A shaft connection hole (14) is formed in the middle of the boss (13) and the wheel (11). The bushing (20) is inserted into the shaft connection hole (14) and pressed to be connected with it. At least one first keyway (16) is formed on the outer wall of the boss (13). At least one second keyway (24) is formed on the outer wall of the bushing (20). A plurality of first keyways (16) and a plurality of second keyways (24) are aligned with each other. A key is inserted in each coaxially aligned first keyway (16) and second keyway (24) to connect the shaft to the sprocket body (10) and the bushing (20).

2. The agricultural machinery sprocket with high connection strength according to claim 1, characterized in that: The bushing (20) includes a shaft hole reinforcing sleeve (21) and a positioning ring (22). The positioning ring (22) is formed on the end face of the shaft hole reinforcing sleeve (21), and both the shaft hole reinforcing sleeve (21) and the positioning ring (22) have through deformation slots (23).

3. The agricultural machinery sprocket with high connection strength according to claim 2, characterized in that: A positioning groove (15) is formed on the inner wall of the end of the boss (13) away from the wheel (11). The shape and size of the positioning ring (22) are adapted to the positioning groove (15). The shaft hole reinforcing sleeve (21) is inserted into the rotating shaft connecting hole (14) by the positioning ring (22).

4. The agricultural machinery sprocket with high connection strength according to claim 3, characterized in that: The end face of the positioning ring (22) facing away from the shaft hole reinforcing sleeve (21) is coplanar with the end face of the boss (13) facing away from the wheel disk (11).

5. A high-strength agricultural machinery sprocket according to any one of claims 1-4, characterized in that: The bushing (20) is made of 42CrMo quenched steel.

6. The agricultural machinery sprocket with high connection strength according to claim 1, characterized in that: Several reinforcing ribs (17) are also formed at the connection between the boss (13) and the wheel (11).

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