Differential assembly structure and drive axle

Abstract

The utility model discloses a differential mechanism assembly structure and a drive axle. The differential mechanism assembly structure comprises a transmission gear, a differential mechanism shell and a plurality of bolts. The key points of the utility model are as follows: a plurality of mounting holes penetrating through the mounting part are formed in the mounting part of the transmission gear; the differential case comprises a first differential case body and a second differential case body which are connected to the inner end and the outer end of the mounting part respectively, and a first flange of the first differential case body is connected to the inner end face of the mounting part and provided with a first bolt hole corresponding to each mounting hole. A second flange of the second differential shell is connected to the outer end surface of the mounting part and is provided with a second bolt hole corresponding to each mounting hole; and one bolt is matched with one first bolt hole, one mounting hole and one second bolt hole which correspond to one another, so that the first differential shell, the second differential shell and the transmission gear are fixed through a plurality of bolts located on the same reference circle, a plurality of bolts located on another reference circle can be omitted, and the outer diameter of the differential shell is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of differentials, and particularly relates to a differential assembly structure and a drive axle. Background Art

[0002] The differential assembly of a single-stage reduction drive axle includes a transmission gear, a differential housing and a plurality of bolts. The transmission gear has a receiving cavity penetrating therethrough. The differential housing includes an outer differential housing and an inner differential housing. The inner end face of the outer differential housing is attached to the outer end face of the transmission gear, and the inner end of the outer differential housing and the transmission gear are fixed by a first set of bolts. The first set of bolts consists of a plurality of bolts located on a first pitch circle. And a positioning portion is formed by protruding the inner end face of the outer differential housing, and the positioning portion extends into the receiving cavity. The outer end of the inner differential housing extends into the receiving cavity, the outer end face of the inner differential housing is attached to the free end face of the positioning portion, and the outer end of the inner differential housing and the positioning portion are fixed by a second set of bolts. The second set of bolts consists of a plurality of bolts located on a second pitch circle, and the second pitch circle is located inside the first pitch circle. However, the maximum outer diameter of the differential housing with the above structure is relatively large, resulting in a relatively heavy weight. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a differential assembly structure and a drive axle that connect a first differential housing and a second differential housing to the inner end and the outer end of an installation portion respectively, and set the first bolt holes of the first differential housing and the second bolt holes of the second differential housing to correspond to the installation holes of the installation portion to reduce the maximum outer diameter of the differential housing.

[0004] To achieve the above purpose, the embodiments of the utility model adopt the following technical solutions:

[0005] A differential assembly structure, including a transmission gear, a differential housing and a plurality of bolts;

[0006] The transmission gear has a first end, a second end located outside the first end, and a receiving cavity penetrating through the first end and the second end inside and outside. An annular installation portion is formed by protruding the inner peripheral wall of the receiving cavity inward. A plurality of installation holes penetrating therethrough are formed in the installation portion along the axial direction of the transmission gear, and the plurality of installation holes are distributed along the circumferential direction of the transmission gear;

[0007] The differential housing includes a first differential housing and a second differential housing respectively connected to the inner end and the outer end of the installation portion. A first flange is formed at the outer end of the first differential housing. The first flange is connected to the inner end face of the installation portion and is provided with a first bolt hole corresponding to each installation hole. A second flange is formed at the inner end of the second differential housing. The second flange is connected to the outer end face of the installation portion and is provided with a second bolt hole corresponding to each installation hole;

[0008] One of the bolts is engaged with a corresponding first bolt hole, an installation hole, and a second bolt hole for connecting the first flange, the installation part, and the second flange.

[0009] Further, the outer end of the installation part extends outward to the end face of the first end, such that the outer end face of the installation part and the end face of the first end are on the same plane. The outer end face of the first flange is in contact with the inner end face of the installation part, and the inner end face of the second flange is in contact with the end face of the second end.

[0010] Further, the outer end of the first differential case is located within the accommodating cavity. In the radial direction of the transmission gear, the second flange extends beyond the installation part in a direction away from the second differential case.

[0011] Further, the outer diameter of the second flange is greater than the outer diameter of the first flange, and the first bolt hole and the second bolt hole penetrate the first flange and the second flange respectively. The rod portion of the bolt is inserted into the first bolt hole, the installation hole, and the second bolt hole in sequence from inside to outside, and the head of the bolt is located within the accommodating cavity and abuts against the inner end face of the first flange.

[0012] Further, the end face of the second end integrally protrudes outward to form an annular protrusion. The inner diameter of the protrusion is greater than the outer diameter of the installation part, and the outer peripheral wall of the second flange is in clearance fit with the inner peripheral wall of the protrusion.

[0013] Further, the end face of the second end is recessed inward to form an annular recess. The inner end face of the second flange protrudes inward corresponding to the recess to form an annular convex ring, and the convex ring is engaged with the recess.

[0014] Further, the inner diameter of the recess is greater than the outer diameter of the installation part.

[0015] Further, there is a spacing between the inner end face and the outer end face of the installation part and the end face of the first end and the end face of the second end respectively, such that the installation part divides the accommodating cavity into a first chamber and a second chamber. The second chamber is located outside the first chamber, and the first flange and the second flange are respectively located in the first chamber and the second chamber.

[0016] The differential assembly structure of the present utility model connects the first differential case and the second differential case to the inner end and the outer end of the mounting portion respectively, and the first differential case and the second differential case are respectively provided with a first bolt hole and a second bolt hole corresponding to each mounting hole, and a bolt is provided to cooperate with a corresponding first bolt hole, a mounting hole and a second bolt hole, that is, the first differential case, the second differential case and the transmission gear are fixed by a plurality of bolts located on the same pitch circle, and a plurality of bolts located on another pitch circle can be cancelled, thereby reducing the outer diameter of the differential case, achieving the purpose of reducing the weight of the differential case and the transmission gear, making the structure more compact, and cancelling the reinforcing ribs while ensuring the strength of the parts, making the lubricating oil flow of the differential assembly structure smoother. The differential assembly structure of the present utility model has the characteristics of simple structure, high production efficiency and low cost.

[0017] An embodiment of the present utility model further provides a drive axle, including the differential assembly structure described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional exploded view of the differential assembly structure of an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 a cross-sectional view in the combined state;

[0020] Figure 3 is Figure 2 another cross-sectional view of an embodiment;

[0021] Figure 4 is Figure 2 a cross-sectional view of an alternative embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, in combination with the drawings and the specific embodiments, the present utility model will be further described:

[0023] As Figures 1 to 4 shown, an embodiment of the present utility model provides a differential assembly structure, which is installed on the drive axle of a heavy vehicle and includes a transmission gear 1, a differential case 2 and a plurality of bolts 3.

[0024] As Figure 1 , Figure 2As shown, the drive gear 1 is a bevel gear, having a first end 11, a second end 12 located outside the first end 11, and a receiving cavity 13 that penetrates through the first end 11 and the second end 12 inside and outside. An annular mounting portion 131 is integrally protruded inward from the inner peripheral wall of the receiving cavity 13. The mounting portion 131 is provided with a plurality of mounting holes 1311 penetrating through it along the axial direction of the drive gear 1. The plurality of mounting holes 1311 are evenly distributed along the circumferential direction of the drive gear 1 and are located on the same pitch circle. In this embodiment, the outer end of the mounting portion 131 extends outward to the end face of the first end 11, so that the outer end face of the mounting portion 131 and the end face of the first end 11 are in the same plane, which can simplify the structure and is beneficial to processing and installation.

[0025] As Figure 1 , Figure 2 shown, the differential case 2 includes a first differential case 21 and a second differential case 22 respectively connected to the inner end and the outer end of the mounting portion 131. A first flange 211 is formed at the outer end of the first differential case 21. The first flange 211 is connected to the inner end face of the mounting portion 131 and is provided with a first bolt hole 212 corresponding to each mounting hole 1311. A second flange 221 is formed at the inner end of the second differential case 22. The second flange 221 is connected to the outer end face of the mounting portion 131 and is provided with a second bolt hole 223 corresponding to each mounting hole 1311. When viewed from the direction perpendicular to the end face of the second end 12, the first bolt hole 212, the mounting hole 1311, and the second bolt hole 223 are located on the same pitch circle.

[0026] As Figure 1 , Figure 2 shown, a bolt 3 is engaged with a corresponding first bolt hole 212, a mounting hole 1311, and a second bolt hole 223 for connecting the first flange 211, the mounting portion 131, and the second flange 221. That is, the same bolt 3 is simultaneously engaged with a corresponding first bolt hole 212, a second bolt hole 223, and a mounting hole 1311. That is, the first differential case 21, the second differential case 22, and the drive gear 1 are fixed by a plurality of bolts 3 located on the same pitch circle. The plurality of bolts located on another pitch circle can be cancelled, thereby reducing the outer diameter of the differential case 2, achieving the purpose of reducing the weights of the differential case 2 and the drive gear 1, making the structure simpler and more compact, and cancelling the reinforcing ribs while ensuring the strength of the parts, making the lubricating oil flow of the differential assembly structure smoother.

[0027] As Figure 1 , Figure 2As shown, the outer end of the first differential housing 21 is located within the receiving cavity 13, and the outer end face of the first flange 211 is in close contact with the inner end face of the mounting portion 131. In the radial direction of the transmission gear 1, the second flange 221 extends beyond the mounting portion 131 in a direction away from the second differential housing 22 to enhance the structural strength. The inner end face of the second flange 221 is in close contact with the end face of the second end 12. To further enhance the structural strength, the outer diameter of the second flange 221 is set to be larger than the outer diameter of the first flange 211. For ease of machining, the first bolt hole 212 and the second bolt hole 223 penetrate through the first flange 211 and the second flange 221 respectively. The rod portion 31 of the bolt 3 is inserted into the first bolt hole 212, the mounting hole 1311, and the second bolt hole 223 in sequence from the inside out. The head 32 of the bolt 3 is located within the receiving cavity 13 to save space and abuts against the inner end face of the first flange 211.

[0028] As Figure 3 shown, in another embodiment, the end face of the second end 12 integrally protrudes outward to form an annular protrusion 121. The inner diameter of the protrusion 121 is larger than the outer diameter of the mounting portion 131. The outer peripheral wall of the second flange 221 is in clearance fit with the inner peripheral wall of the protrusion 121 to achieve radial limitation of the second differential housing 22, thereby improving the positioning accuracy.

[0029] As Figure 4 shown, in an alternative embodiment, the end face of the second end 12 is recessed inward to form an annular recess 122. The inner diameter of the recess 122 is larger than the outer diameter of the mounting portion 131 to ensure the structural strength of the transmission gear 1. The inner end face of the second flange 221 integrally protrudes inward corresponding to the recess 122 to form an annular protrusion ring 2211. The protrusion ring 2211 cooperates with the recess 122 to achieve radial limitation of the second differential housing 22 and further improve the positioning accuracy.

[0030] In other embodiments, there is a gap between the inner end face and the outer end face of the mounting portion 131 and the end faces of the first end 11 and the second end 12 respectively, such that the mounting portion 131 divides the receiving cavity 13 into a first chamber and a second chamber (not shown). The second chamber is located outside the first chamber, and the first flange 211 and the second flange 221 are respectively located within the first chamber and the second chamber.

[0031] The differential assembly structure of the present utility model connects the first differential case and the second differential case to the inner end and the outer end of the mounting portion respectively, and the first differential case and the second differential case are respectively provided with a first bolt hole and a second bolt hole corresponding to each mounting hole. A bolt is provided to cooperate with a corresponding first bolt hole, a mounting hole and a second bolt hole, that is, the first differential case, the second differential case and the transmission gear are fixed by a plurality of bolts located on the same pitch circle, and a plurality of bolts located on another pitch circle can be cancelled, thereby reducing the outer diameter of the differential case, achieving the purpose of reducing the weight of the differential case and the transmission gear, making the structure more compact, and cancelling the reinforcing ribs while ensuring the strength of the parts, making the lubricating oil flow of the differential assembly structure smoother. The differential assembly structure of the present utility model has the characteristics of simple structure, high production efficiency and low cost.

[0032] An embodiment of the present utility model further provides a drive axle (not shown), including the differential assembly structure described in any of the above embodiments.

[0033] The above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The differential assembly structure is characterized by: Including transmission gear, differential case and multiple bolts; The transmission gear comprises a first end, a second end located outside the first end, and a receiving cavity penetrating the first end and the second end, the inner peripheral wall of the receiving cavity protrudes inward to form an annular mounting portion, the mounting portion is provided with a plurality of mounting holes penetrating the mounting portion along the axial direction of the transmission gear, and the plurality of mounting holes are distributed along the circumference of the transmission gear; The differential case comprises a first differential case and a second differential case respectively connected to the inner end and the outer end of the mounting portion, wherein the outer end of the first differential case is formed with a first flange, the first flange is connected to the inner end surface of the mounting portion and has a first bolt hole corresponding to each mounting hole, and the inner end of the second differential case is formed with a second flange, the second flange is connected to the outer end surface of the mounting portion and has a second bolt hole corresponding to each mounting hole; The bolt cooperates with the first bolt hole, the mounting hole and the second bolt hole which correspond to each other, and is used to connect the first flange, the mounting portion and the second flange.

2. The differential assembly structure according to claim 1, characterized in that: The outer end of the mounting portion extends outward to the end face of the first end, so that the outer end face of the mounting portion and the end face of the first end are in the same plane, the outer end face of the first flange is in contact with the inner end face of the mounting portion, and the inner end face of the second flange is in contact with the end face of the second end.

3. The differential assembly structure according to claim 2, characterized in that: The outer end of the first differential housing is located in the accommodating cavity, and in the radial direction of the transmission gear, the second flange exceeds the mounting portion in a direction away from the second differential housing.

4. The differential assembly structure according to claim 1, characterized in that: The outer diameter of the second flange is larger than the outer diameter of the first flange, and the first bolt hole and the second bolt hole penetrate the first flange and the second flange respectively, the rod of the bolt is inserted into the first bolt hole, the mounting hole and the second bolt hole in sequence from the inside to the outside, and the head of the bolt is located in the accommodating cavity and abuts against the inner end surface of the first flange.

5. The differential assembly structure according to claim 1, characterized in that: The end surface of the second end integrally protrudes outward to form an annular convex portion, the inner diameter of the convex portion is larger than the outer diameter of the mounting portion, and the outer peripheral wall of the second flange is gap-matched with the inner peripheral wall of the convex portion.

6. The differential assembly structure according to claim 1, characterized in that: The end surface of the second end is inwardly concave to form an annular recessed portion, and the inner end surface of the second flange protrudes inwardly corresponding to the recessed portion to form an annular convex ring, and the convex ring cooperates with the recessed portion.

7. The differential assembly structure according to claim 6, characterized in that: The inner diameter of the recessed portion is greater than the outer diameter of the mounting portion.

8. The differential assembly structure according to claim 1, characterized in that: The inner end face and the outer end face of the mounting portion are spaced apart from the end faces of the first end and the second end, respectively, so that the mounting portion divides the accommodating cavity into a first cavity and a second cavity, the second cavity is located outside the first cavity, and the first flange and the second flange are located in the first cavity and the second cavity, respectively.

9. Drive axle, characterized in that: It comprises the differential assembly structure as claimed in any one of claims 1 to 8.

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