A gearbox input shaft assembly and a gearbox

Abstract

The utility model relates to the technical field of gearbox, disclose a kind of gearbox input shaft assembly and gearbox, gearbox input shaft assembly includes input shaft, gear sleeve and limiting piece, gear sleeve is set to input shaft outside, limiting piece is located between input shaft and gear sleeve, at least one of input shaft and gear sleeve is set with limiting slot, limiting piece is used to extend into limiting slot and with limiting slot and limiting cooperation, make gear sleeve be limited to input shaft outside along the axial end of input shaft. Gearbox input shaft assembly adopts split type structure design, reduces processing technology difficulty, improves the reliability of gearbox whole while guaranteeing transmission efficiency, after limiting piece enters the limiting slot of input shaft or gear sleeve, form bidirectional axial constraint, prevent gear sleeve axial migration under high-speed operation or gear shift impact.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology, specifically relating to a gearbox input shaft assembly and a gearbox. Background Technology

[0002] In recent years, with the rapid development of agricultural machinery towards higher efficiency and intelligence, the requirements for the working capacity and operational quality of agricultural machinery have been continuously increasing. As the core component of power transmission in agricultural machinery, the gearbox's structural design directly affects the overall performance of the machine. Among the current mainstream technical solutions, the traditional integrated gear shaft structure achieves power transmission by molding the input shaft and gear into one piece. Although it has the advantage of compact structure in small and medium-sized agricultural machinery, in large-scale, high-load scenarios, its excessively long axial dimension of the input shaft makes it difficult to guarantee machining accuracy. At the same time, the long shaft structure is prone to overload due to insufficient support during assembly, inducing local stress concentration, significantly increasing the risk of shaft fatigue fracture, and requiring complete replacement during maintenance, resulting in poor economic efficiency. Utility Model Content

[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, the present invention provides a gearbox input shaft assembly and a gearbox. Through the split design and limiting components, it can reduce the local stress of the shaft and allow the gear sleeve or input shaft to be disassembled and replaced separately.

[0004] To achieve the above objectives, this utility model provides a gearbox input shaft assembly, the gearbox input shaft assembly comprising: Input axis; A toothed sleeve is fitted over the input shaft; A limiting member is located between the input shaft and the gear sleeve. At least one of the input shaft and the gear sleeve has a limiting groove. The limiting member is used to extend into the limiting groove and engage with the limiting groove to limit the gear sleeve so that both ends of the gear sleeve are limited to the outside of the input shaft along the axial direction of the input shaft.

[0005] In some embodiments, both the gear sleeve and the input shaft are provided with the limiting groove, and the limiting member located at the limiting position engages with the limiting groove and extends from one of the limiting grooves into the other limiting groove.

[0006] In some embodiments, the limiting groove on the input shaft is a first groove, the limiting groove on the gear sleeve is a second groove, the input end of the input shaft is used to connect with an external driving component, the gear sleeve is fitted onto the output end of the input shaft, and the second groove includes a guide section and a limiting section arranged sequentially from the input end to the output end, the depth of the guide section gradually increasing from the input end to the output end.

[0007] In some embodiments, the limiting member is an elastic member, and a deformation space for the limiting member to deform is provided between the bottom wall of the first groove, the bottom wall of the second groove, and the limiting member located at the limiting position.

[0008] In some embodiments, a compression groove is provided on the side of the toothed sleeve near the input end. The depth of the compression groove gradually decreases from the input end to the output end and forms an inwardly contracting compression slope. The compression slope is used to compress and guide the limiting member.

[0009] In some embodiments, the number of the first grooves is at least two, and the at least two first grooves are spaced apart along the axial direction of the input shaft. The number of the second grooves is the same as that of the first grooves and they are arranged in a one-to-one correspondence.

[0010] In some embodiments, the limiting groove is an annular groove, and the limiting member is an annular member adapted to the limiting groove.

[0011] In some embodiments, the limiting member is a snap ring.

[0012] In some embodiments, the gear sleeve is connected to the input shaft via a spline.

[0013] The second aspect of this utility model provides a gearbox, including the gearbox input shaft assembly described in any one of the above claims.

[0014] The above technical solution, through the split design of the gear sleeve being fitted outside the input shaft, significantly shortens the axial dimension of the input shaft body, avoids problems such as overload of the gear shaft components, reduces the difficulty of processing, and helps to ensure the transmission accuracy of the gearbox input shaft assembly. While improving the overall reliability of the gearbox, it also ensures transmission efficiency. At the same time, the bidirectional axial constraint formed by the limiting component set in the limiting groove of the input shaft or gear sleeve can both suppress the tendency of long shaft overload and distribute the load, significantly reducing the local stress of the shaft and improving its service life. In addition, the split design allows the gear sleeve or input shaft to be disassembled and replaced separately, which can reduce maintenance costs compared to the overall scrapping mode of the integrated structure.

[0015] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a cross-sectional view of an embodiment of the gearbox input shaft assembly of this utility model; Figure 2 for Figure 1 Enlarged view of section A; Figure 3 This is a schematic diagram of an embodiment of the first groove and the second groove in this utility model; Figure 4 for Figure 3 A schematic diagram of the installation process of the first and second grooves; Explanation of reference numerals in the attached figures Detailed Implementation

[0017] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0019] like Figure 1 As shown, this utility model provides a gearbox input shaft assembly, which includes an input shaft 10, a gear sleeve 20, and a limiting member 30. The gear sleeve 20 is sleeved outside the input shaft 10 and adopts a split structure to avoid the problem of reduced accuracy due to material deformation. The limiting member 30 is located between the input shaft 10 and the gear sleeve 20. At least one of the input shaft 10 and the gear sleeve 20 is provided with a limiting groove. That is, a limiting groove can be provided on the input shaft 10, or on the gear sleeve 20, or both can be provided with limiting grooves. The limiting member 30 is used to extend into the limiting groove and perform a limiting engagement with the limiting groove. The limiting member 30 simultaneously abuts against the input shaft 10 and the gear sleeve 20 in the limiting groove, so that the gear sleeve 20 is limited to both ends outside the input shaft 10 along the axial direction of the input shaft 10. After the limiting member 30 extends into the limiting groove of the input shaft 10 or the gear sleeve 20, it forms a bidirectional axial constraint, preventing the gear sleeve 20 from axially moving under high-speed operation or shifting impact.

[0020] The gearbox input shaft assembly provided by this utility model adopts a split structure design. By using a gear sleeve 20 fitted outside the input shaft 10, the axial dimension of the input shaft 10 body is significantly shortened, avoiding problems such as overload of the gear shaft component, reducing the difficulty of processing, and improving the transmission accuracy of the gearbox input shaft assembly. While improving the overall reliability of the gearbox, it also ensures transmission efficiency. At the same time, the bidirectional axial constraint formed by the limiting member 30 set in the limiting groove of the input shaft 10 or the gear sleeve 20 can prevent the input shaft 10 and the gear sleeve 20 from separating relative to each other along the axial direction. This can ensure the fixed stability between the input shaft 10 and the gear sleeve 20, suppress the tendency of long shaft overload, distribute the load, significantly reduce the local stress of the shaft, and improve the service life. In addition, the split design allows the gear sleeve 20 or the input shaft 10 to be disassembled and replaced separately. Compared with the overall scrapping mode of the integrated structure, it can reduce maintenance costs, especially suitable for the rapid maintenance needs of large agricultural machinery under high-frequency impact conditions.

[0021] In some embodiments, a limiting groove can be provided on the input shaft 10, and a limiting member 30 can be located within the limiting groove for limiting engagement. The limiting member 30 simultaneously abuts against the inner wall of the limiting groove and the inner wall of the gear sleeve 20. In another embodiment, a limiting groove can be provided on the gear sleeve 20, and a limiting member 30 can be located within the limiting groove for limiting engagement. The limiting member 30 simultaneously abuts against the inner wall of the limiting groove and the outer surface of the input shaft 10. Both of the above-described single-sided slotting embodiments can limit the gear sleeve 20 to both ends along the axial direction of the input shaft 10 outside the input shaft 10. Moreover, the single-sided slotting design eliminates the alignment requirement, and during assembly, only the engagement between the limiting member 30 and the limiting groove needs to be controlled, significantly reducing the assembly accuracy requirements.

[0022] In some embodiments, both the gear sleeve 20 and the input shaft 10 have limiting grooves, and the two limiting grooves are used to connect and form a limiting space, such as... Figure 3 As shown, the limiting component 30 located at the limiting position and the limiting space formed by the two limiting grooves perform limiting engagement, with the limiting component extending from one limiting groove into the other. Specifically, the limiting position is the position after the input shaft 10 and the gear sleeve 20 are assembled. The limiting grooves opened on the input shaft 10 and the gear sleeve 20 are connected after assembly to form a continuous limiting space. The limiting component 30 is located in both limiting grooves, achieving bidirectional limiting in both axial and radial directions. This eliminates the axial displacement and circumferential wobble of the gear sleeve 20 caused by vibration or impact. With the help of the limiting space enveloping the limiting component 30, the torsional and radial combined loads transmitted by the gear sleeve 20 can be effectively dispersed. At the same time, the split structure allows the gear sleeve 20 to be disassembled and replaced separately, requiring only axial extraction. Compared with the integrated long shaft structure, this reduces maintenance downtime and comprehensively considers structural strength and maintenance economy under high load conditions.

[0023] In some implementations, such as Figure 3 and Figure 4As shown, the limiting groove on the input shaft 10 is the first groove 11, and the limiting groove on the gear sleeve 20 is the second groove 21. The input end 12 of the input shaft 10 is used to connect with an external drive component, and the gear sleeve 20 is fitted onto the output end 13 of the input shaft 10. The second groove 21 includes a guide section 211 and a limiting section 212 arranged sequentially from the input end 12 to the output end 13. The depth of the guide section 211 gradually increases from the input end 12 to the output end 13. It can be understood that the guide section 211 of the second groove 21 makes the sidewall of the second groove 21 near the input end 12 of the input shaft 10 a slope. The slope facilitates the movement of the limiting member 30 into and out of the second groove 21. At the same time, the depth of the first groove 11 of the input shaft 10 is sufficient to accommodate the limiting member 30, making it convenient for the limiting member 30 to be accommodated in the first groove 11 during assembly. Figure 4 As shown, when the input shaft 10 is installed, the limiting member 30 is completely located within the first groove 11. The limiting member 30 enters the gear sleeve 20 along with the input shaft 10. As the input shaft 10 gradually extends axially into the gear sleeve 20, when it reaches the guide section 211 of the second groove 21, the limiting member 30 gradually enters the limiting section 212 of the second groove 21 through the inclined surface of the guide section 211. Figure 3 As shown, when the first groove 11 and the second groove 21 are aligned, the center of the limiting member 30 is located in the central region of the two grooves. At this time, the limiting member 30 restricts the relative movement of the input shaft 10 and the gear sleeve 20. When the input shaft 10 is disassembled, the same mechanism applies. The limiting member 30 can be squeezed into the first groove 11 by the guide section 211 on the second groove 21 and come out together with the input shaft 10.

[0024] In some embodiments, the limiting member 30 is an elastic member. A deformation space is provided between the bottom wall of the first groove 11, the bottom wall of the second groove 21, and the limiting member 30 located at the limiting position, allowing the limiting member 30 to deform. The limiting member 30 can be pre-installed in the first groove 11, where it is initially limited. During the axial insertion of the input shaft 10 into the gear sleeve 20, the elastic member undergoes elastic deformation due to the compression of the gear sleeve 20, reducing its diameter and further pressing the limiting member 30 into the first groove 11. This facilitates the limiting member 30 extending into the gear sleeve 20 along with the input shaft 10, improving the ease of installation. When the first groove 11 and the second groove 21 are aligned, the limiting member 30 returns to its original shape due to its elasticity. At this time, the center of the limiting member 30 is located in the central region of the limiting segment 212 of the first groove 11 and the second groove 21, thus restricting the relative movement of the input shaft 10 and the gear sleeve 20. When the input shaft 10 is disassembled, the same mechanism applies. The limiting member 30 can be deformed by the guide section 211 of the toothed sleeve 20 and re-enter the first groove 11 as a whole, and then come out together with the input shaft 10.

[0025] In some implementations, such as Figure 2 As shown, a compression groove is provided on the side of the toothed sleeve 20 near the input end 12. The depth of the compression groove gradually decreases from the input end 12 to the output end 13, forming an inwardly contracting compression slope 22. The compression slope 22 is used to compress the guide limiting member 30. The compression slope 22, formed by the gradually decreasing depth of the compression groove along the direction from the input end 12 to the output end 13, gradually compresses the limiting member 30 during axial installation through the sliding contact between the compression slope 22 and the outer edge of the limiting member 30, causing it to produce controllable elastic deformation. For example, it reduces the opening gap of the snap ring, thereby reducing assembly resistance. At the same time, the guiding effect of the compression slope 22 eliminates the risk of off-center loading caused by human operation deviation, such as avoiding snap ring twisting or local jamming.

[0026] In some embodiments, there are at least two first grooves 11, which are spaced apart along the axial direction of the input shaft 10. The number of second grooves 21 is the same as that of the first grooves 11, and they are arranged in a one-to-one correspondence. The at least two first grooves 11 spaced apart along the axial direction of the input shaft 10 and the corresponding second grooves 21 of the gear sleeve 20 form multiple sets of limiting spaces. The limiting member 30 can selectively enter any set of grooves, allowing the gear sleeve 20 to be adjusted in multiple gear positions along the axial direction of the input shaft 10 to adapt to the meshing requirements of different gear sets. The groove group design allows for quick adjustment of the working range of the gear sleeve 20 by changing the insertion position of the limiting member 30, without the need for overall replacement. This significantly reduces the modification costs of large agricultural machinery due to changes in working conditions and extends the service life of the gearbox input shaft assembly.

[0027] In some embodiments, the limiting groove is an annular groove, and the limiting member 30 is an annular member adapted to the limiting groove, realizing full circumferential limiting of the gear sleeve 20 and the input shaft 10. The combination design of the annular limiting groove and the elastic annular limiting member 30 significantly improves the axial positioning stability and impact resistance through the full circumferential elastic contact mechanism. The first annular groove 11 on the input shaft 10 and the second groove 21 on the gear sleeve 20 form a continuous annular limiting space. After the adapted elastic annular limiting member 30 enters the limiting space, it utilizes its elastic deformation capability to achieve a tight fit between the gear sleeve 20 and the input shaft 10 without additional fasteners, effectively suppressing axial movement; at the same time, the 360° wrapping structure of the annular groove makes the load evenly distributed along the circumference of the input shaft 10, which can avoid local wear.

[0028] In some embodiments, the limiting component 30 is a retaining ring. The retaining ring is both elastic and can be annular, meeting usage requirements and being economical. The retaining ring is adapted to the annular limiting grooves on the input shaft 10 and the gear sleeve 20. It enters the first groove 11 by utilizing the elastic deformation at the opening of the retaining ring, eliminating the need for complex fasteners or additional processing; axial pressing is sufficient for limiting, significantly simplifying the assembly process. Furthermore, as a standardized part, the retaining ring is easy to procure and can be quickly disassembled and replaced using specialized tools, significantly reducing maintenance costs.

[0029] In some embodiments, the gear sleeve 20 is connected to the input shaft 10 via a spline. The spline connection enables efficient torque transmission while ensuring relative rotational stability between the two; the axial multi-tooth structure of the spline increases the contact area between the input shaft 10 and the gear sleeve 20, which can evenly distribute stress, making the connection more reliable and effectively improving the load-bearing capacity and service life of the gearbox input shaft assembly.

[0030] The second aspect of this utility model provides a gearbox, including the aforementioned gearbox input shaft assembly. This gearbox is not only suitable for tractors, but also for agricultural machinery with similar structures such as harvesters and agricultural transport vehicles, meeting diverse operational needs.

[0031] The gearbox input shaft assembly also includes a bearing housing 40, a rear housing 50, and a bearing 60. The bearing housing 40 is sleeved on the input shaft 10; the rear housing 50 is connected to the output end 13 of the input shaft 10; the bearing 60 is sleeved on the gear sleeve 20 and connected to both the bearing housing 40 and the rear housing 50. The outer wall of the bearing 60 is interference-fitted with the mounting holes on the bearing housing 40 and the rear housing 50 to achieve axial and radial positioning and fixation of the gear sleeve 20. The bearing 60 used in this invention is a tapered roller bearing, but bearings of other sizes can also be used for adjustment; this invention does not impose specific limitations.

[0032] The gearbox input shaft assembly and gearbox provided by this utility model, through the split design of the gear sleeve 20 being fitted outside the input shaft 10, significantly shorten the axial dimension of the input shaft 10 body, avoid problems such as overload of the gear shaft component, reduce the difficulty of processing, and improve the transmission accuracy of the gearbox input shaft assembly. While improving the overall reliability of the gearbox, it also ensures transmission efficiency. At the same time, the bidirectional axial constraint formed by the limiting member 30 set in the limiting groove of the input shaft 10 or the gear sleeve 20 not only suppresses the tendency of long shaft overload, but also disperses the load, significantly reduces the local stress of the shaft body, and improves the service life. In addition, the split design allows the gear sleeve 20 or the input shaft 10 to be disassembled and replaced separately. Compared with the overall scrapping mode of the integrated structure, it can reduce maintenance costs, especially suitable for the rapid maintenance needs of large agricultural machinery under high-frequency impact conditions.

[0033] In the description of this utility model, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] 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. In this specification, the illustrative expressions of the above terms 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 or examples described in this specification, as well as the features of different embodiments or examples.

[0036] 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. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gearbox input shaft assembly, characterized in that, The gearbox input shaft assembly includes: Input axis (10); A toothed sleeve (20) is fitted over the input shaft (10); A limiting member (30) is located between the input shaft (10) and the gear sleeve (20). At least one of the input shaft (10) and the gear sleeve (20) has a limiting groove. The limiting member (30) is used to extend into the limiting groove and cooperate with the limiting groove to limit the gear sleeve (20) so that both ends of the gear sleeve (20) are limited to outside the input shaft (10) along the axial direction.

2. The gearbox input shaft assembly according to claim 1, characterized in that, Both the gear sleeve (20) and the input shaft (10) are provided with the limiting groove. The limiting member (30) located at the limiting position cooperates with the limiting groove and extends from one of the limiting grooves into the other limiting groove.

3. The gearbox input shaft assembly according to claim 2, characterized in that, The limiting groove on the input shaft (10) is a first groove (11), and the limiting groove on the gear sleeve (20) is a second groove (21). The input end (12) of the input shaft (10) is used to connect with an external drive component. The gear sleeve (20) is fitted onto the output end (13) of the input shaft (10). The second groove (21) includes a guide section (211) and a limiting section (212) arranged sequentially from the input end (12) to the output end (13). The depth of the guide section (211) gradually increases from the input end (12) to the output end (13).

4. The gearbox input shaft assembly according to claim 3, characterized in that, The limiting member (30) is an elastic member. The bottom wall of the first groove (11) and the bottom wall of the second groove (21) are provided with a deformation space for the limiting member (30) to deform between them and the limiting member (30) located at the limiting position.

5. The gearbox input shaft assembly according to claim 4, characterized in that, A compression groove is provided on the side of the tooth sleeve (20) near the input end (12). The depth of the compression groove gradually decreases from the input end (12) to the output end (13) and forms an inwardly contracting compression slope (22). The compression slope (22) is used to compress and guide the limiting member (30).

6. The gearbox input shaft assembly according to claim 3, characterized in that, The number of the first groove (11) is at least two, and the at least two first grooves (11) are spaced apart along the axial direction of the input shaft (10). The number of the second grooves (21) is the same as that of the first grooves (11) and they are arranged in a one-to-one correspondence.

7. The gearbox input shaft assembly according to any one of claims 1 to 6, characterized in that, The limiting groove is an annular groove, and the limiting member (30) is an annular member adapted to the limiting groove.

8. The gearbox input shaft assembly according to any one of claims 1 to 6, characterized in that, The limiting component (30) is a retaining ring.

9. The gearbox input shaft assembly according to any one of claims 1 to 6, characterized in that, The gear sleeve (20) is connected to the input shaft (10) by a spline.

10. A gearbox, characterized in that, Includes the gearbox input shaft assembly as described in any one of claims 1 to 9.

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