Rear axle housing with middle PTO (Power Take Off)

Abstract

The utility model provides a rear axle housing equipped with a middle PTO, which comprises a rear axle housing body, the lower side of the rear part of the rear axle housing body is provided with a PTO cavity protruding downwards, the PTO cavity is internally provided with a PTO driven shaft and a PTO driving shaft, the PTO driven shaft is in transmission connection with the PTO driving shaft, and the front end of the PTO driven shaft extends out of the front side wall of the PTO cavity. By the adoption of the rear axle shell, the lower side of the rear portion of the rear axle shell body protrudes and forms the PTO cavity, the PTO driven shaft and the PTO driving shaft are both arranged in the PTO cavity, and an independent middle PTO shell is omitted; the middle PTO shell and the rear axle shell can be cast and formed at a time through the casting technology of the rear axle shell, the overall casting, machining and assembling complexity of the middle PTO shell and the rear axle shell is reduced, and the manufacturing cost is low.

Description

Technical Field

[0001] This utility model relates to the field of tractor rear axle housing technology, specifically to a rear axle housing with a centrally located PTO. Background Technology

[0002] Currently, more and more tractors are equipped with center-mounted PTOs to meet the diverse operational needs of tractors. The center-mounted PTO is an independent unit; on common tractors, the center-mounted PTO housing is an additional component separate from the rear axle housing. When an external implement requires the center-mounted PTO, the housing is bolted to the rear axle housing, and gears within the center-mounted PTO housing mesh with gears within the rear axle housing to achieve power transmission. This independent structure of the center-mounted PTO housing and the rear axle housing increases the complexity of housing casting, machining, and assembly, resulting in high manufacturing costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is: how to reduce the manufacturing cost and complexity of the mid-mounted PTO housing and the rear axle housing.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] This utility model provides a rear axle housing with a centrally located PTO, including a rear axle housing body. The rear lower side of the rear axle housing body is provided with a downwardly protruding PTO cavity. The PTO cavity is provided with a PTO passive shaft and a PTO active shaft. The PTO passive shaft is connected to the PTO active shaft for transmission. The front end of the PTO passive shaft extends out of the front side wall of the PTO cavity.

[0006] The beneficial effects of this utility model are:

[0007] By adopting this utility model, the rear lower side of the rear axle housing body protrudes and forms a PTO cavity, in which both the PTO passive shaft and the PTO active shaft are arranged, eliminating the need for a separate central PTO housing. It can be cast in one piece using the casting process of the rear axle housing, reducing the complexity of casting, processing and assembly of the central PTO housing and the rear axle housing as a whole, and resulting in low manufacturing costs.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the rear end of the rear axle housing body is also provided with a rear axle housing cover, the rear end of the PTO passive shaft and the rear end of the PTO active shaft are respectively connected to the inner side of the rear axle housing cover, and the front part of the PTO passive shaft and the front end of the PTO active shaft are respectively connected to the front side wall of the PTO cavity.

[0010] The PTO driven shaft and PTO drive shaft can be disassembled and installed by removing the rear cover of the rear axle housing, which is convenient for disassembly and installation; at the same time, it is easy to perform axial positioning of the PTO driven shaft and PTO drive shaft, which has good reliability.

[0011] Furthermore, the inner side of the rear cover of the rear axle housing is provided with bearing seats corresponding to the PTO passive shaft and the PTO active shaft, respectively, and the rear ends of the PTO passive shaft and the PTO active shaft are respectively connected to the bearing seats through bearings.

[0012] To avoid interference between the rear axle housing and the PTO driven shaft and the PTO driven shaft, and to reduce mechanical friction.

[0013] Furthermore, the front sidewall of the PTO cavity is provided with bearing grooves corresponding to the PTO passive shaft and the PTO active shaft, and the front part of the PTO passive shaft and the front end of the PTO active shaft are respectively connected to the bearing grooves through bearings.

[0014] It helps to reduce mechanical friction.

[0015] Furthermore, an oil seal is fitted on the front of the PTO passive shaft, and the oil seal is located on the front side of the bearing groove corresponding to the PTO passive shaft.

[0016] This helps prevent lubricant leakage.

[0017] Furthermore, the PTO passive shaft is provided with a passive gear, and the PTO active shaft is provided with an active gear, which meshes with the passive gear.

[0018] During installation, the drive gear meshes with the gear inside the rear axle housing; during operation, the drive gear transmits the power from the rear axle housing to the driven gear, thereby driving the PTO driven shaft to rotate; it is easy to assemble and has good reliability.

[0019] Furthermore, the driving gear is higher than the driven gear.

[0020] This facilitates the engagement of the drive gear with the gear inside the rear axle housing, allowing power to be obtained through the drive gear.

[0021] Furthermore, the drive gear is integrally formed with the PTO drive shaft.

[0022] The drive gear and PTO drive shaft can be integrally machined from forgings, resulting in high strength, good transmission reliability, and convenient installation.

[0023] Furthermore, the passive gear is movably fitted onto the PTO passive shaft, and a meshing sleeve is provided on one side of the hub of the passive gear. The meshing sleeve can slide along its own axial direction to mesh with the PTO passive shaft.

[0024] When the centrally mounted PTO is required to output power, the engagement sleeve slides to engage with the PTO driven shaft; when the centrally mounted PTO is not required to output power, the engagement sleeve slides to be fully positioned on one side of the hub of the driven gear; this provides convenient control, avoids the PTO driven shaft from spinning idly when there are no external tools, and improves safety.

[0025] Furthermore, the PTO driven shaft is also provided with a shoulder and a sleeve. The shoulder and the meshing sleeve are located on the front side of the driven gear. The outer diameter of the front hub of the driven gear is the same as the outer diameter of the shoulder. Both the front hub of the driven gear and the shoulder are provided with spline structures that can mesh with the meshing sleeve. The sleeve is located on the rear side of the driven gear.

[0026] The driven gear can drive the PTO driven shaft to rotate by meshing with the shaft shoulder; the shaft shoulder and shaft sleeve can constrain the axial position of the driven gear, resulting in good stability; the driven gear can be disassembled and assembled by removing the shaft sleeve, which is convenient. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 This is a vertical sectional view of the present invention along the centrally located PTO output shaft.

[0029] Figure 3 This is a horizontal sectional view of the present invention along the output shaft of the centrally located PTO.

[0030] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0031] 1-Rear axle housing body; 2-PTO cavity; 3-PTO driven shaft; 4-PTO drive shaft; 5-Rear axle housing rear cover; 6-Bearing seat; 7-Bearing groove; 8-Oil seal; 9-Driven gear; 10-Drive gear; 11-Meshing sleeve; 12-Shaft shoulder; 13-Shaft sleeve. Detailed Implementation

[0032] 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.

[0033] This utility model refers to Figure 1-3 .

[0034] This utility model provides a rear axle housing with a centrally located PTO, including a rear axle housing body 1. The rear lower side of the rear axle housing body 1 is provided with a downwardly protruding PTO cavity 2. The PTO cavity 2 is provided with a PTO passive shaft 3 and a PTO active shaft 4. The PTO passive shaft 3 and the PTO active shaft 4 are connected in a driving connection. The front end of the PTO passive shaft 3 extends out of the front side wall of the PTO cavity 2.

[0035] principle:

[0036] During installation, the gear mounting method inside the rear axle housing body 1 remains unchanged, and various existing rear axle housing transmission structures can be adopted. The gear in the rear axle housing used to transmit the power of the mid-mounted PTO is connected to the PTO drive shaft 4. During operation, the PTO drive shaft 4 is used to receive the power in the rear axle housing and transmit it to the PTO driven shaft 3. The front end of the PTO driven shaft 3 can output power to external implements.

[0037] By adopting this utility model, the rear lower side of the rear axle housing body 1 protrudes to form a PTO cavity 2, and the PTO passive shaft 3 and PTO active shaft 4 are both arranged in the PTO cavity 2, eliminating the need for a separate central PTO housing; it can be cast in one piece using the casting process of the rear axle housing, reducing the complexity of casting, processing and assembly of the central PTO housing and the rear axle housing as a whole, and resulting in low manufacturing cost.

[0038] Furthermore, the rear end of the rear axle housing body 1 is also provided with a rear axle housing cover 5, the rear end of the PTO passive shaft 3 and the rear end of the PTO active shaft 4 are respectively connected to the inner side of the rear axle housing cover 5, and the front part of the PTO passive shaft 3 and the front end of the PTO active shaft 4 are respectively connected to the front side wall of the PTO cavity 2.

[0039] The PTO driven shaft 3 and PTO drive shaft 4 can be disassembled and assembled by removing the rear cover 5 of the rear axle housing, which is convenient for disassembly and assembly; at the same time, it is easy to perform axial positioning of the PTO driven shaft 3 and PTO drive shaft 4, which has good reliability.

[0040] Furthermore, the inner side of the rear cover 5 of the rear axle housing is provided with bearing seats 6 corresponding to the PTO passive shaft 3 and the PTO active shaft 4 respectively. The rear ends of the PTO passive shaft 3 and the PTO active shaft 4 are respectively connected to the bearing seats 6 by bearings.

[0041] To avoid interference between the rear axle housing cover 5 and the rotation of the PTO passive shaft 3 and the PTO active shaft 4, and to reduce mechanical friction.

[0042] Furthermore, the front sidewall of the PTO cavity 2 is provided with bearing grooves 7 corresponding to the PTO passive shaft 3 and the PTO active shaft 4. The front part of the PTO passive shaft 3 and the front end of the PTO active shaft 4 are respectively connected to the bearing grooves 7 by bearings.

[0043] It helps to reduce mechanical friction.

[0044] Furthermore, an oil seal 8 is also fitted on the front part of the PTO passive shaft 3, and the oil seal 8 is located on the front side of the bearing groove 7 corresponding to the PTO passive shaft 3.

[0045] This helps prevent lubricant leakage.

[0046] Furthermore, the PTO passive shaft 3 is provided with a passive gear 9, and the PTO active shaft 4 is provided with an active gear 10, which meshes with the passive gear 9.

[0047] During installation, the drive gear 10 meshes with the gear inside the rear axle housing 1; during operation, the drive gear 10 transmits the power inside the rear axle housing 1 to the driven gear 9, thereby driving the PTO driven shaft 3 to rotate; it is easy to assemble and has good reliability.

[0048] Furthermore, the driving gear 10 is higher than the driven gear 9.

[0049] This facilitates the engagement of the drive gear 10 with the gear inside the rear axle housing 1, allowing power to be obtained through the drive gear 10.

[0050] Furthermore, the drive gear 10 is integrally formed with the PTO drive shaft 4.

[0051] The drive gear 10 and the PTO drive shaft 4 can be integrally formed by forging, which has high strength, good transmission reliability, and is easy to install.

[0052] Furthermore, the passive gear 9 is movably fitted onto the PTO passive shaft 3, and a meshing sleeve 11 is provided on one side of the hub of the passive gear 9. The meshing sleeve 11 can slide along its own axial direction to mesh with the PTO passive shaft 3.

[0053] When the PTO output power is required, the engagement sleeve 11 slides to engage with the PTO driven shaft 3; when the PTO output power is not required, the engagement sleeve 11 slides to be fully located on one side of the hub of the driven gear 9; this makes control convenient, avoids the PTO driven shaft 3 from spinning idly when there are no external tools, and improves safety.

[0054] Furthermore, the PTO driven shaft 3 is also provided with a shoulder 12 and a sleeve 13. The shoulder 12 and the meshing sleeve 11 are located on the front side of the driven gear 9. The outer diameter of the front hub of the driven gear 9 is the same as the outer diameter of the shoulder 12. Both the front hub of the driven gear 9 and the shoulder 12 are provided with spline structures that can mesh with the meshing sleeve 11. The sleeve 13 is located on the rear side of the driven gear 9.

[0055] The driven gear 9 can drive the PTO driven shaft 3 to rotate by meshing the sleeve 11 with the shoulder 12; the axial position of the driven gear 9 can be constrained by the shoulder 12 and the sleeve 13, which has good stability; the driven gear 9 can be disassembled and assembled by removing the sleeve 13, which is convenient.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 rear axle housing with a mid-mounted PTO, characterized in that: The rear axle housing body (1) is provided with a downward protruding PTO cavity (2) on the lower rear side of the rear axle housing body (1). The PTO cavity (2) is provided with a PTO passive shaft (3) and a PTO active shaft (4). The PTO passive shaft (3) and the PTO active shaft (4) are connected in a drive connection. The front end of the PTO passive shaft (3) extends out of the front side wall of the PTO cavity (2).

2. The rear axle housing with a centrally located PTO as described in claim 1, characterized in that: The rear end of the rear axle housing body (1) is also provided with a rear axle housing cover (5). The rear end of the PTO passive shaft (3) and the rear end of the PTO active shaft (4) are respectively connected to the inner side of the rear axle housing cover (5). The front part of the PTO passive shaft (3) and the front end of the PTO active shaft (4) are respectively connected to the front side wall of the PTO cavity (2).

3. The rear axle housing with a centrally located PTO as described in claim 2, characterized in that: The inner side of the rear cover (5) of the rear axle housing is provided with bearing seats (6) corresponding to the PTO passive shaft (3) and the PTO active shaft (4), respectively. The rear end of the PTO passive shaft (3) and the rear end of the PTO active shaft (4) are respectively connected to the bearing seats (6) through bearings.

4. The rear axle housing with a centrally located PTO as described in claim 2, characterized in that: The front side wall of the PTO cavity (2) is provided with bearing grooves (7) corresponding to the PTO passive shaft (3) and the PTO active shaft (4). The front part of the PTO passive shaft (3) and the front end of the PTO active shaft (4) are respectively connected to the bearing grooves (7) through bearings.

5. The rear axle housing with a centrally located PTO as described in claim 4, characterized in that: The front part of the PTO passive shaft (3) is also fitted with an oil seal (8), which is located on the front side of the bearing groove (7) corresponding to the PTO passive shaft (3).

6. The rear axle housing with a centrally located PTO as described in claim 1, characterized in that: The PTO passive shaft (3) is provided with a passive gear (9), and the PTO active shaft (4) is provided with an active gear (10). The active gear (10) meshes with the passive gear (9).

7. The rear axle housing with a centrally located PTO as described in claim 6, characterized in that: The driving gear (10) is higher than the driven gear (9).

8. The rear axle housing with a centrally located PTO as described in claim 6, characterized in that: The drive gear (10) and the PTO drive shaft (4) are integrally formed.

9. The rear axle housing with a centrally located PTO as described in claim 6, characterized in that: The passive gear (9) is movably fitted onto the PTO passive shaft (3). A meshing sleeve (11) is also provided on one side of the hub of the passive gear (9). The meshing sleeve (11) can slide along its own axis to mesh with the PTO passive shaft (3).

10. The rear axle housing with a centrally located PTO as described in claim 9, characterized in that: The PTO driven shaft (3) is also provided with a shoulder (12) and a sleeve (13). The shoulder (12) and the meshing sleeve (11) are located on the front side of the driven gear (9). The outer diameter of the front hub of the driven gear (9) is the same as the outer diameter of the shoulder (12). Both the front hub of the driven gear (9) and the shoulder (12) are provided with spline structures that can mesh with the meshing sleeve (11). The sleeve (13) is located on the rear side of the driven gear (9).

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