Assembly structure of differential shell and main reduction gear

Abstract

The assembly structure of the differential shell and the main reduction gear comprises the differential shell and the main reduction gear, the differential shell is provided with an installation circular ring corresponding to the main reduction gear and a positioning circular ring abutting against the end face of the main reduction gear, and the main reduction gear is welded to the installation circular ring. The supporting convex ribs are arranged on the inner side of the mounting ring in the radial direction and evenly distributed in the circumferential direction of the mounting ring. The mounting ring is supported by the plurality of supporting convex ribs, and the structural strength of the mounting ring is improved, so that the bearing capacity of a welding seam on the mounting ring is improved, the deformation rate of the mounting ring in the torque transmission process is reduced, and the probability of deformation and cracking of the welding seam between the mounting ring and the main reduction gear is reduced; therefore, the risk of cracking and unsoldering between the differential shell and the main reduction gear is reduced, and the stability and reliability of the differential and main reduction gear assembly structure are improved.

Description

Technical Field

[0001] The utility model relates to an assembly structure of a differential case and a main reduction gear, which is used for connecting a differential case and the main reduction gear. Background Art

[0002] When assembling the differential and the main reduction gear, the main reduction gear needs to be set on the housing of the differential to transmit torque. The connection methods generally include bolt connection, welding or spline. Bolt connection will increase weight on the one hand, and the end of the bolt will protrude after connection on the other hand. As the main reduction gear rotates, the protruding part of the bolt will also participate in oil stirring, resulting in large oil stirring loss and low transmission efficiency. Although spline connection can ensure the transmission of torque between the differential and the main reduction gear, the main reduction gear will still be subjected to axial force during vehicle driving. Even if the spline tooth side or tooth top adopts an interference fit design, it is difficult to effectively resist its axial force by relying solely on the interference required by the spline assembly. The main reduction gear is prone to axial movement, and its reliability and stability are poor. In addition, even if an axial locking structure is set between the splines to suppress axial movement, the splines are in a lubricating oil environment for a long time, and micro corrosion will occur under long-term operation. The side clearance between the splines becomes larger, and sudden acceleration or deceleration will produce abnormal noise problems such as knocking. In recent years, welded differentials have obvious advantages in terms of light weight and cost, and tend to replace bolted or splined differentials. However, when welding is used to transmit torque, the differential is made of ductile iron, and the main reduction gear is made of alloy steel. After the main reduction gear and the differential housing are welded, when the main reduction gear transmits torque, only the gear meshing part is used for torque transmission. When the torque is transmitted to the weld, only the weld at the stress-bearing part is loaded, and the load on the welds at other parts is very small. During the stress process of the differential housing, the welding position of the differential housing is prone to slight deformation under the traction of the weld, resulting in deformation cracks on the weld between the differential housing and the main reduction gear. Continuing to carry the load has the risk of inducing cracking and desoldering, reducing the stability and reliability of the assembly structure of the differential and the main reduction gear. Utility Model Content

[0003] The assembly structure of the differential case and the main reduction gear provided by the utility model improves the structural strength of the installation ring by supporting the installation ring through multiple supporting ribs, thereby improving the load-bearing capacity of the weld on the installation ring, reducing the deformation rate of the installation ring during torque transmission, and reducing the probability of deformation and cracking of the weld between the installation ring and the main reduction gear, thereby reducing the risk of cracking and desoldering between the differential case and the main reduction gear, and improving the stability and reliability of the assembly structure of the differential and the main reduction gear.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The assembly structure of the differential housing and the main reduction gear comprises a differential housing and the main reduction gear, wherein the differential housing is provided with a mounting ring corresponding to the main reduction gear and a positioning ring abutting against the end face of the main reduction gear, and the main reduction gear is welded to the mounting ring, and is characterized in that: a supporting rib for supporting the mounting ring is integrally formed on the differential housing, the supporting rib is radially arranged on the inner side of the mounting ring, and a plurality of supporting ribs are evenly distributed along the circumference of the mounting ring.

[0006] Preferably, the mounting ring is coaxially arranged on the outer side of the half-shaft mounting hole convex ring on the differential housing, the supporting ribs are arranged between the mounting ring and the half-shaft mounting hole convex ring, and the inner end is connected to the half-shaft mounting hole convex ring, and the outer end is connected to the mounting ring, and the number of the supporting ribs is 4 to 16.

[0007] Preferably, the outer wall of the mounting ring is formed by an annular welding surface welded to the inner wall of the main reduction gear, a downwardly recessed annular exhaust groove and an annular press-fit surface with interference fit to the main reduction gear, which are connected in sequence from outside to inside.

[0008] Preferably, the annular welding surface is an inclined slope surface inclined downward by 5° to 10°, and the outer edge of the annular welding surface is a chamfered edge and the chamfering angle is greater than the downward inclination angle of the annular welding surface.

[0009] Preferably, the interference between the annular press-fit surface and the inner wall of the main reduction gear is 0.03-0.1 mm.

[0010] The beneficial effects of the utility model are:

[0011] The utility model discloses an assembly structure of a differential case and a main reduction gear, in which the main reduction gear is welded on a mounting ring, and an integrally formed supporting rib is formed on the differential case, the supporting rib is radially arranged on the inner side of the mounting ring, and a plurality of supporting ribs are evenly distributed along the circumference of the mounting ring. The mounting ring is supported by a plurality of supporting ribs, so that the structural strength of the mounting ring is improved, thereby improving the bearing capacity of the weld on the mounting ring, reducing the deformation rate of the mounting ring during torque transmission, and reducing the probability of deformation and cracking of the weld between the mounting ring and the main reduction gear, thereby reducing the risk of cracking and desoldering between the differential case and the main reduction gear, and improving the stability and reliability of the assembly structure of the differential and the main reduction gear.

[0012] The main reducer gear and the mounting ring are assembled by a combination of welding and interference fit, which not only facilitates the rapid positioning of the main reducer gear and the mounting ring, but also the interference fit can bear part of the torque, reducing the impact of the alternating load on the weld between the mounting ring and the main reducer gear, thereby further reducing the probability of weld deformation and cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the assembly structure of the differential housing and the main reduction gear of the utility model.

[0014] Figure 2 Schematic diagram of the differential shell.

[0015] Figure 3 Set up the cross section on the differential housing for the mounting ring and the locating ring. DETAILED DESCRIPTION

[0016] Combine the following Figures 1 to 3 The embodiments of the present utility model are described in detail.

[0017] The assembly structure of the differential housing and the main reduction gear comprises a differential housing 1 and a main reduction gear 2. The differential housing 1 is provided with a mounting ring 3 corresponding to the main reduction gear 2 and a positioning ring 4 abutting against the end face of the main reduction gear. The main reduction gear 2 is welded to the mounting ring 3. The feature is that: a supporting rib 5 for supporting the mounting ring 3 is integrally formed on the differential housing 1. The supporting rib 5 is radially arranged on the inner side of the mounting ring 3, and a plurality of supporting ribs 5 are evenly distributed along the circumference of the mounting ring 3.

[0018] In the assembly structure of the differential case and the main reduction gear described above, the main reduction gear 2 is welded on the mounting ring 3, and a supporting rib 5 is integrally formed on the differential case 1. The supporting rib 5 is radially arranged on the inner side of the mounting ring 3, and multiple supporting ribs 5 are evenly distributed along the circumference of the mounting ring. The mounting ring 3 is supported by multiple supporting ribs 5 to improve the structural strength of the mounting ring 3, thereby improving the bearing capacity of the weld on the mounting ring 3, reducing the deformation rate of the mounting ring 3 during torque transmission, and reducing the probability of deformation and cracking of the weld between the mounting ring 3 and the main reduction gear 2, thereby reducing the risk of cracking and desoldering between the differential case 1 and the main reduction gear 2, and improving the stability and reliability of the assembly structure of the differential and the main reduction gear.

[0019] Among them, the mounting ring 3 is coaxially arranged on the outside of the half-shaft mounting hole convex ring 6 on the differential housing 1, and the supporting convex rib 5 is arranged between the mounting ring 3 and the half-shaft mounting hole convex ring 6, and the inner end is connected to the half-shaft mounting hole convex ring 6, and the outer end is connected to the mounting ring 3, and the number of the supporting convex ribs 5 is 4 to 16. Both ends of the supporting convex rib 5 are connected to the circular ring structure, and the supporting strength is higher. The 4 to 16 supporting convex ribs 5 are evenly distributed along the circumference of the mounting ring 3, forming a full circle of support for the mounting ring 3, improving the structural strength of the mounting ring 3, and improving the bearing capacity of the weld on the mounting ring 3 during the torque transmission process, effectively resisting the traction during the torque transmission process, and effectively reducing the probability of welding deformation and cracking.

[0020] The outer wall of the mounting ring 3 is formed by connecting the annular welding surface 31 welded to the inner wall of the main reduction gear 2, the downwardly recessed annular exhaust groove 32 and the annular press-fit surface 33 with interference fit with the main reduction gear from the outside to the inside. The annular press-fit surface 33 is interference fit with the main reduction gear 2, and the annular welding surface 31 is welded to the main reduction gear 2, so that the main reduction gear 2 and the mounting ring 3 are assembled by welding and interference fit. The interference fit between the annular press-fit surface 33 and the main reduction gear 2 not only facilitates the rapid positioning of the main reduction gear 2 and the mounting ring 3, but also the interference fit can bear part of the torque, reduce the impact of the alternating load on the weld between the mounting ring 3 and the main reduction gear 2, and further reduce the probability of weld deformation and cracking. The annular exhaust groove 32 is used to discharge the solder gas during welding. An exhaust groove corresponding to the annular exhaust groove 32 can be opened on the main reduction gear 2, and an exhaust hole connected to the exhaust groove can be opened to exhaust gas outward.

[0021] The annular welding surface 31 is an inclined slope surface inclined downward by 5° to 10°, and the outer edge 34 of the annular welding surface 31 is a chamfered edge and the chamfer angle is greater than the downward inclination angle of the annular welding surface 31. The annular welding surface 31 is an inclined slope surface inclined downward, and a groove is formed between the annular welding surface 31 and the inner wall of the main reduction gear 2, and the outer edge 34 of the annular welding surface 31 is set as a chamfered edge, so that the groove forms an opening shape that opens outward, which not only increases the groove area and increases the welding area between the main reduction gear 2 and the mounting ring 3, but also the groove of the open shape guides the filling of the solder, which is conducive to the solder fully filling into the groove and improving the reliability of welding.

[0022] The interference between the annular press-fit surface 33 and the inner wall of the main reduction gear is 0.03-0.1mm. The inner wall of the main reduction gear 2 and the annular press-fit surface 33 form a small interference fit, which facilitates the rapid matching and positioning of the main reduction gear 2 and the mounting ring 1, and forms a groove with uniform width between the annular welding surface 31 and the inner wall of the main reduction gear 2, ensuring the uniformity of the weld between the main reduction gear 2 and the mounting ring 3, and the interference fit can share part of the torque load, reduce the load of the weld, and improve the reliability and stability of the assembly structure of the main reduction gear 2 and the differential housing 1.

[0023] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. The assembly structure of the differential housing and the main reduction gear comprises a differential housing and a main reduction gear. The differential housing has a mounting ring corresponding to the main reduction gear and a positioning ring abutting against the end face of the main reduction gear. The main reduction gear is welded on the mounting ring, and is characterized in that: The differential housing is integrally formed with supporting convex ribs for supporting the mounting ring, the supporting convex ribs are radially arranged on the inner side of the mounting ring, and a plurality of supporting convex ribs are evenly distributed along the circumference of the mounting ring.

2. The assembly structure of the differential housing and the main reduction gear according to claim 1 is characterized in that: The mounting ring is coaxially arranged on the outer side of the half-shaft mounting hole convex ring on the differential housing, the supporting convex ribs are arranged between the mounting ring and the half-shaft mounting hole convex ring, and the inner end is connected to the half-shaft mounting hole convex ring, and the outer end is connected to the mounting ring, and the number of the supporting convex ribs is 4 to 16.

3. The assembly structure of the differential housing and the main reduction gear according to claim 2 is characterized in that: The outer wall of the mounting ring is formed by connecting in sequence from outside to inside an annular welding surface welded to the inner wall of the main reduction gear, a downwardly recessed annular exhaust groove and an annular pressing surface with interference fit to the main reduction gear.

4. The assembly structure of the differential housing and the main reduction gear according to claim 3 is characterized in that: The annular welding surface is an inclined slope surface inclined downward by 5° to 10°, and the outer edge of the annular welding surface is a chamfered edge and the chamfering angle is greater than the downward inclination angle of the annular welding surface.

5. The assembly structure of the differential housing and the main reduction gear according to claim 3 is characterized in that: The interference between the annular press-fit surface and the inner wall of the main reduction gear is 0.03-0.1 mm.

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