WO2013023368A1

WO2013023368A1 - Method for welding axle housing to axle tube and structure for connecting axle housing to axle tube

Info

Publication number: WO2013023368A1
Application number: PCT/CN2011/078520
Authority: WO
Inventors: 谈智辉; 罗楠
Original assignee: 长沙中联重工科技发展股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-08-17
Filing date: 2011-08-17
Publication date: 2013-02-21

Abstract

Disclosed is a method for welding an axle housing to an axle tube, comprising: (a) processing a welding end face (1a) of the axle housing (1) and a welding end face (2a) of the axle tube (2) respectively such that the welding end face of the axle housing and the welding end face of the axle tube mate with each other and are not perpendicular to the axial direction of the axle tube; and (b) aligning and welding the welding end face of the axle tube with the welding end face of the axle housing. Also provided is a structure for connecting an axle housing to an axle tube, which connecting structure comprises an axle housing and an axle tube which are connected by welding, wherein the welding end face of the axle housing and the welding end face of the axle tube are mated with each other and are not perpendicular to the axial direction of the axle tube. Since the welding end faces of the axle housing and of the axle tube are not perpendicular to the axial direction, stress can be distributed on a plurality of cross sections perpendicular to the axial direction, thus dispersing the stress concentration at the welding location and effectively improving the overall fatigue strength of the axle housing and axle tube assembly.

Description

Welding method of bridge shell and shaft tube and connection structure of bridge shell and shaft tube

The present invention relates to a vehicle, and in particular to a method of welding a bridge housing and a shaft tube of a vehicle and a connection structure of the bridge housing and the shaft tube. Background technique

The stamped bridge housing is typically connected to the shaft tube by welding. As shown in FIG. 1 and FIG. 2 (FIG. 1 shows a structure in which the flange 4 is integrally formed on the shaft tube 2 in the prior art, and FIG. 2 shows that the flange 4 is fixed to the bridge housing by welding in the prior art. The structure on the 1), the welding end faces of the bridge housing 1 and the shaft tube 2 are aligned perpendicularly to the axial direction of the shaft tube 2, and the annular weld bead 3 is formed along the circumference of the aligned welding end faces. In this welded joint, the annular weld bead 3 is located on the same section perpendicular to the axial direction of the shaft tube 2, so that stress concentration is liable to occur at the welded end face. Therefore, the fatigue strength of the welded end faces of the bridge housing 1 and the shaft tube 2 is lower than the fatigue strength of the other positions of the bridge housing 1 and the shaft tube 2, so that an assembly having a higher overall fatigue strength cannot be obtained. Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to increase the fatigue strength of a bridge housing and a shaft tube assembly by dispersing the stress concentration of the welded end faces of the bridge housing and the shaft tube.

In order to achieve the above object, the present invention provides a method for welding a bridge housing and a shaft tube, the method comprising: (a) separately processing a welding end surface of the bridge housing and a welding end surface of the shaft tube, such that the bridge housing a welding end face and a welding end face of the shaft tube are matched to each other and not perpendicular to an axial direction of the shaft tube; and (b) aligning a welding end surface of the shaft tube with a welding end surface of the bridge housing and welding.

Preferably, in the step (a), the welded end face of the bridge housing and the welded end face of the shaft tube are machined into a flat surface. Preferably, the angle between the plane and the axial direction of the shaft tube is between 0 and 90 degrees. More preferably, the angle between the plane and the axial direction of the shaft tube is between 20 and 60 degrees.

Preferably, in the step (b), the welded end faces of the bridge housings aligned with each other and the circumferential end portions of the welded end faces of the shaft tubes are welded to form an annular weld bead.

Preferably, the method further includes mounting a flange on the outer circumference of the bridge housing and mounting a rear leaf spring seat on the axle housing.

Preferably, the lower portion of the axle housing leaves a region that is not welded to the flange.

The present invention also provides a connection structure of a bridge housing and a shaft tube, the connection structure comprising a welded connection bridge housing and a shaft tube, wherein the welding end surface of the bridge housing and the welding end surface of the shaft tube match each other And not perpendicular to the axial direction of the shaft tube.

Preferably, the welding end surface of the bridge housing and the welding end surface of the shaft tube are both planar. Preferably, the angle between the plane and the axial direction of the shaft tube is between 0 and 90 degrees. More preferably, the angle between the plane and the axial direction of the shaft tube is between 20 and 60 degrees.

Preferably, the connecting structure comprises welding a circumferential end of the welded end face of the bridge housing and the circumferential end of the welded end face of the shaft tube to form an annular weld.

Preferably, the connecting structure includes a peripheral flange welded to the axle housing and a rear leaf spring seat mounted on the axle housing.

According to the above technical solution, the welding end faces of the bridge shell and the shaft tube are not perpendicular to the axial direction, so that the stress concentration can be distributed in a plurality of cross sections perpendicular to the axial direction, thereby dispersing the stress concentration of the welded portion and effectively improving the bridge. Overall fatigue strength of the housing and the axle tube assembly.

Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are in the In the drawing:

1 is a schematic view showing a welded structure of a bridge housing and a shaft tube of an embodiment of the prior art, wherein the flange is integrally formed on the shaft tube;

2 is a schematic view showing a welded structure of a bridge housing and a shaft tube according to another embodiment of the prior art, wherein the flange is fixed to the bridge housing by welding;

Figure 3 is a schematic view showing a welded structure of a bridge housing and a shaft tube according to an embodiment of the present invention;

Figure 4 is a schematic view showing the welded end faces of the bridge housing and the shaft tube of Figure 3;

Figure 5 is a schematic view showing the welding end face of the flange and the bridge housing of Figure 3. Description of the reference numerals

1 : Bridge housing la: welding end face of the bridge housing

2: Shaft tube 2a: Welding end face of the shaft tube

3: Ring weld 4: Flange 4a: Welding end face of the flange

5: Rear leaf spring seat

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

In the present invention, the orientation words such as "up, down, left, and right" as used herein generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inside and outside". It refers to the inside and outside of the outline of each component itself. According to an aspect of the invention, a method of welding a bridge housing and a shaft tube is provided, the method comprising: (a) processing a welding end face 1a of the bridge housing 1 and a welding end surface 2a of the shaft tube 2, respectively, such that The welding end face 1a of the bridge housing 1 and the welding end face 2a of the shaft tube 2 are matched to each other and are not perpendicular to the axial direction of the shaft tube 2; and (b) the welding end face 2a of the shaft tube 2 is The welding end face la of the bridge housing 1 is aligned and welded.

By processing the welding end face 1a of the axle housing 1 and the welding end face 2a of the shaft tube 2 so as not to be perpendicular to the axial direction, the stress concentration after welding can be made not to be distributed on the same cross section perpendicular to the axial direction, but Distributed in a plurality of cross-sections perpendicular to the axial direction (ie, the welded end faces 1a of the bridge housing 1 and the plurality of axially perpendicular sections through which the welding end faces 2a of the shaft tubes 2 pass), thereby being capable of dispersing stress concentration and Overall increase the fatigue strength of the axle housing and the axle tube assembly.

Preferably, as shown in Fig. 4, in the step (a), the welding end face la of the bridge housing 1 and the welding end face 2a of the shaft tube 2 are machined into a flat surface. On the one hand, processing into a plane makes the processing simple; on the other hand, the welding end face la of the bridge housing 1 formed into a plane and the welding end face 2a of the shaft tube 2 facilitate subsequent alignment and welding operations. It will be understood by those skilled in the art that the welding end face 1a of the bridge housing 1 and the welding end surface 2a of the shaft tube 2 can also be formed into matching curved surfaces as long as the main portion of the curved surface is not perpendicular to the axial direction of the shaft tube 2 can.

In the case where the welding end face 1a of the bridge housing 1 and the welding end face 2a of the shaft tube 2 are machined into a plane, the welding end face 1a of the bridge housing 1 and the welding end face 2a of the shaft tube 2 are formed so as not to be perpendicular It is sufficient for the axial direction of the shaft tube 2 to pass through a plurality of cross sections perpendicular to the axial direction to disperse stress concentration. Preferably, the angle α between the plane and the axial direction of the shaft tube 2 may be between 0 and 90 degrees. More preferably, the angle α between the plane and the axial direction of the shaft tube 2 may be between 20 and 60 degrees for ease of processing and welding.

Further, as shown in FIG. 3, in the step (b), the circumferential weld bead 3 is welded along the circumferential end portions of the welded end faces 1a of the bridge housing 1 and the welded end faces 2a of the shaft tubes 2 which are aligned with each other. Since the welding end face 1a of the bridge housing 1 and the welding end surface 2a of the shaft tube 2 are formed as a plane inclined with respect to the axial direction, from the plane of the welding end face la of the axle housing 1 and the welding end face 2a of the shaft tube 2, Ring The weld bead 3 is actually formed into an elliptical shape. In the case where the welding end surface 1a of the bridge housing 1 and the welding end surface 2a of the shaft tube 2 are formed into a curved surface (for example, including a plurality of parallel flat portions and a connecting portion connecting the plurality of flat portions), the annular weld bead 3 does not It is also an elliptical shape, but a three-dimensional curved shape.

Furthermore, the method of the present invention may further comprise a welded flange 4 on the outer circumference of the axle housing 1 and a mounted leaf spring seat 5 on the axle housing 1. Among them, the flange 4 and the rear leaf spring seat 5 are well-known components of those skilled in the art, and will not be described in detail herein.

Preferably, as shown in Figs. 3 and 5, the lower portion of the bridge housing 1 leaves a region that is not welded to the flange 4. In other words, since the force receiving characteristic of the axle housing 1 is that the upper portion is pressed and the lower portion is pulled, although the flange 4 is welded to the outside of the axle housing 1, the present embodiment leaves the lower portion of the bridge housing 1 The area of the welding of the blue 4 is such that the welded portion does not include the lower portion of the annular belt (which may also be the lower half region) where the flange 4 is in contact with the axle housing 1, so as to be protected from the welded structure of the lower portion after welding. The flange 4 and the bridge housing 1 are different in structure to generate a stress concentration source, thereby generating stress concentration and reducing the fatigue life of the components of the bridge housing 1 and the shaft tube 2. In the embodiment shown in Figures 3 and 5, the welded end face 4a of the flange occupies most of the annular band of the flange 4 in contact with the axle housing 1, and the lower portion of the axle housing 1 remains unwelded. The area then occupies a small portion of the endless belt, but it will be understood by those skilled in the art that the welded end face 4a and the unwelded portion of the flange each may occupy half of the endless belt. Preferably, the unwelded area occupies 1/6-1/2 of the endless belt in contact with the bridge housing 1 of the flange 4.

According to another aspect of the present invention, there is also provided a connection structure of a bridge housing and a shaft tube, the connection structure comprising a welded connection bridge housing 1 and a shaft tube 2, wherein the welding end surface of the bridge housing 1 is la The welding end faces 2a of the shaft tube 2 are matched to each other and are not perpendicular to the axial direction of the shaft tube 2.

By forming the welding end face 1a of the axle housing 1 and the welding end face 2a of the shaft tube 2 so as not to be perpendicular to the axial direction, the stress can be prevented from being concentratedly distributed on the same cross section perpendicular to the axial direction after welding, but Distributed in a plurality of cross-sections perpendicular to the axial direction (ie, the welded end faces 1a of the bridge housing 1 and the plurality of axially perpendicular sections through which the welding end faces 2a of the shaft tubes 2 pass), thereby being capable of dispersing stress concentration and Overall increase the fatigue strength of the axle housing and the axle tube assembly. Preferably, the welding end face 1a of the axle housing 1 and the welding end face 2a of the axle tube 2 are both planar. On the one hand, the processing can be made simple; on the other hand, the welding end face 1a of the bridge housing 1 formed into a plane and the welding end face 2a of the shaft tube 2 facilitate alignment and welding. It will be understood by those skilled in the art that the welding end face 1a of the axle housing 1 and the welding end face 2a of the shaft tube 2 can also be formed as matching curved surfaces as long as the main portion of the curved surface is not perpendicular to the axial direction of the shaft tube 2 can.

In the case where the welding end surface 1a of the bridge housing 1 and the welding end surface 2a of the shaft tube 2 are formed into a flat surface, the welding end surface 1a of the bridge housing 1 and the welding end surface 2a of the shaft tube 2 are formed so as not to be perpendicular It is sufficient for the axial direction of the shaft tube 2 to pass through a plurality of cross sections perpendicular to the axial direction to disperse stress concentration. Preferably, the angle α between the plane and the axial direction of the shaft tube 2 is between 0 and 90 degrees. More preferably, the angle α between the plane and the axial direction of the shaft tube 2 is between 20 and 60 degrees for machining and welding.

Further, as shown in Fig. 3, the joint structure includes a welded end face la of the bridge housing 1 aligned with each other and a circumferential portion of the welded end face 2a of the shaft tube 2 welded to form an annular weld bead 3. Since the welding end face 1a of the bridge housing 1 and the welding end surface 2a of the shaft tube 2 are formed as a plane inclined with respect to the axial direction, from the plane of the welding end face la of the axle housing 1 and the welding end face 2a of the shaft tube 2, The annular weld bead 3 is actually formed into an elliptical shape.

Further, the connecting structure may further include a peripheral flange 4 welded to the bridge housing 1 and a rear leaf spring seat 5 mounted on the axle housing 1. Among them, the flange 4 and the rear leaf spring seat 5 are well-known components of those skilled in the art, and will not be described in detail herein.

Preferably, as shown in FIGS. 3 and 5, the lower portion of the axle housing 1 leaves a region that is not welded to the flange 4. Since the force-receiving feature of the axle housing 1 is that the upper portion is pressed and the lower portion is pulled, although the flange 4 is welded to the outside of the axle housing 1, the present embodiment leaves the flange 4 in the lower portion of the axle housing 1 The welded area is such that the welded portion does not include the lower portion of the annular band (which may also be the lower half region) where the flange 4 is in contact with the bridge housing 1 to protect the welded structure and flange after the lower portion is welded. 4 A stress concentration source is generated unlike the structure of the bridge housing 1, thereby generating stress concentration and reducing the fatigue life of the components of the bridge housing 1 and the shaft tube 2. Although in the embodiment shown in Figures 3 and 5, the method The welding end face 4a of the blue occupies most of the annular band of the flange 4 in contact with the axle housing 1, and the unwelded portion left in the lower portion of the axle housing 1 occupies a small half of the annular band, but It will be understood by those skilled in the art that it is also possible for the welded end face 4a and the unwelded region of the flange to each occupy half of the endless belt. Preferably, the unwelded area occupies 1/6-1/2 of the endless belt of the flange 4 in contact with the axle housing 1.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations.

In addition, any combination of various embodiments of the invention may be made, as long as it does not deviate from the idea of the invention, and should also be regarded as the disclosure of the invention.

Claims

1. A method of welding a bridge housing and a shaft tube, the method comprising:

(a) processing the welded end face (la) of the bridge housing (1) and the welding end face (2a) of the shaft tube (2), respectively, such that the welded end face (la) of the bridge housing (1) and the shaft The welding end faces (2a) of the tubes (2) match each other and are not perpendicular to the axial direction of the shaft tube (2);

(b) Align and weld the welded end face (2a) of the shaft tube (2) and the welded end face (la) of the bridge housing (1).

2. The method of welding a bridge housing and a shaft tube according to claim 1, wherein in the step (a), the welding end face (la) of the bridge housing (1) and the shaft tube (2) The welding end face (2a) is machined to a flat surface.

3. The method of welding a bridge housing and a shaft tube according to claim 2, wherein an angle (α) between the plane and an axial direction of the shaft tube (2) is between 0 and 90 degrees between.

4. The method of welding a bridge housing and a shaft tube according to claim 3, wherein an angle (α) between the plane and an axial direction of the shaft tube (2) is between 20 and 60 degrees between.

The method of welding a bridge housing and a shaft tube according to claim 2, wherein in the step (b), the welding end faces (la) of the bridge housing (1) aligned with each other and the The circumferential weld of the welded end face (2a) of the shaft tube (2) is welded to form an annular weld bead (3).

The method of welding a bridge housing and a shaft tube according to any one of claims 1 to 5, wherein the method further comprises welding a flange (4) on the outer circumference of the bridge housing (1) and A rear leaf spring seat (5) on the axle housing (1).

The method of welding a bridge housing and a shaft tube according to claim 6, wherein a lower portion of the axle housing (1) leaves a region that is not welded to the flange (4).

8. A connection structure of a bridge housing and a shaft tube, the connection structure comprising a welded connection bridge housing (1) and a shaft tube (2), characterized in that the welding end surface of the bridge housing (1) La) The welding end faces (2a) of the shaft tube (2) are matched to each other and are not perpendicular to the axial direction of the shaft tube (2).

9. The connection structure of the axle housing and the shaft tube according to claim 8, wherein the welding end surface (la) of the bridge housing (1) and the welding end surface (2a) of the shaft tube (2) are both It is a plane.

10. The connection structure of the axle housing and the shaft tube according to claim 9, wherein an angle (α) between the plane and the axial direction of the shaft tube (2) is between 0 and 90 degrees between.

11. The connection structure of the axle housing and the shaft tube according to claim 10, wherein an angle ([alpha]) between the plane and the axial direction of the shaft tube (2) is between 20 and 60 degrees between.

12. The connection structure of a bridge housing and a shaft tube according to claim 9, wherein the connection structure comprises a welding end face (la) of the bridge housing (1) aligned with each other and the shaft tube The circumferential weld of the welded end face (2a) of (2) forms a toroidal weld (3).

13. The connection structure of a bridge housing and a shaft tube according to any one of claims 8 to 12, wherein the connection structure comprises a peripheral flange (4) welded to the bridge housing (1) and A rear leaf spring seat (5) mounted on the axle housing (1).

14. The joint structure of a bridge housing and a shaft tube according to claim 13, wherein a lower portion of the bridge housing (1) leaves a region that is not welded to the flange (4).