Trailer axle housing and follow-up axle

Abstract

The utility model provides a trailer axle housing and a follow-up axle, and relates to the technical field of vehicle parts. The trailer axle housing comprises an axle tube body, a first guide arm, a second guide arm, a brake bottom plate, an ABS support seat and a shock absorber seat mounting boss. The first guide arm, the second guide arm, the brake bottom plate, the ABS bracket seat, the shock absorber seat mounting boss and the axle tube body are integrally cast; a first guide arm and a second guide arm are arranged on the two sides of the axis of the shaft tube body respectively. Brake bottom plates are arranged at the two ends of the axle tube body; an ABS support seat is arranged close to the brake bottom plate shaft tube body. The shock absorber seat mounting boss is arranged between the first guide arm and the second guide arm close to the axis of the axle tube body, so that the integration level of the trailer axle housing is improved, abrasion caused by relative movement of all parts of the trailer axle housing is avoided, the service life of the trailer axle housing is prolonged, bolts and nuts are not needed for assisting fixation, and the cost is reduced. Potential safety hazards caused by loosening of the bolt and the nut can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts, in particular to a trailer axle housing and a trailing axle. Background Art

[0002] The trailer axle housing is a key component affecting the load-bearing capacity of the vehicle, mainly used for load-bearing, braking, etc.

[0003] At present, the existing trailer axle housing is mainly assembled by stamping and welding parts, forgings and a small number of castings. The above method makes there be gaps between the components of the trailer axle housing. During the driving process of the vehicle, on the one hand, the components of the trailer axle housing are prone to relative movement, causing wear to the components of the trailer axle housing; on the other hand, the bolts and nuts are prone to loosen, causing potential safety hazards. Summary of the Utility Model

[0004] The embodiment of the present application provides a trailer axle housing and a trailing axle. Among them, the first guiding arm, the second guiding arm, the brake backing plate and the ABS bracket seat of the trailer axle housing are integrally cast with the axle tube body, which is beneficial to improving the integration of the trailer axle housing, avoiding relative movement between the components of the trailer axle housing to form wear, beneficial to extending the service life of the trailer axle housing, and without the assistance of bolts and nuts for fixing, which is beneficial to eliminating the potential safety hazards caused by the loosening of bolts and nuts.

[0005] In the first aspect, the present application proposes a trailer axle housing, including: an axle tube body, a first guiding arm, a second guiding arm, a brake backing plate, an ABS bracket seat and a shock absorber seat mounting boss; the first guiding arm, the second guiding arm, the brake backing plate, the ABS bracket seat and the shock absorber seat mounting boss are integrally cast with the axle tube body; wherein, the first guiding arm and the second guiding arm are respectively arranged on both sides of the axis of the axle tube body; the brake backing plates are arranged at both ends of the axle tube body; the ABS bracket seat is arranged on the axle tube body close to the brake backing plate; the shock absorber seat mounting boss is arranged between the first guiding arm and the second guiding arm close to the axis of the axle tube body.

[0006] In some feasible embodiments, the radial cross-section of the axle tube body is an irregular quadrilateral; wherein, a flange is formed on one side of the axle tube body provided with the first guiding arm and / or one side of the axle tube body provided with the second guiding arm, so as to enable the smooth connection between the axle tube body and the first guiding arm and / or the second guiding arm.

[0007] In some feasible embodiments, the wall thickness distribution of the axle tube body is positively correlated with the stress distribution borne by the axle tube body, wherein the wall thickness distribution and / or the fillet radius of the four fillets of the irregular quadrilateral are positively correlated with the stress borne by the four fillets.

[0008] In some feasible embodiments, the radial cross-section of the first guiding arm is concave, and the cross-sectional area of the radial cross-section decreases sequentially from the connecting end to the supporting end of the first guiding arm. Wherein, a first flanging is formed on the supporting edge of the first guiding arm.

[0009] In some feasible embodiments, sand discharge holes are respectively formed on one side of the middle section of the axle tube body where the first guiding arm is arranged and on one side of the axle tube body where the second guiding arm is arranged. Wherein, a second flanging is formed on the outer edge of the sand discharge hole.

[0010] In some feasible embodiments, the trailer axle housing as described in any one of the above also includes: axle heads integrally cast at both ends of the axle tube body; or, the axle heads are made of high-strength materials and are inserted at both ends of the axle tube body. Wherein, a positioning pin is arranged between the axle head and the axle tube body, and the thickness distribution of the axle head is positively correlated with the stress distribution received by the axle head.

[0011] In some feasible embodiments, the trailer axle housing further includes: an oil seal installation part arranged on the axle head; or, the oil seal installation part is arranged on the axle tube body. Wherein, the oil seal installation part, the axle head and the axle tube body are integrally cast.

[0012] In some feasible embodiments, when the oil seal installation part is arranged on the axle head, a first boss is arranged at one end of the oil seal installation part close to the axle tube body.

[0013] In some feasible embodiments, when the oil seal installation part is arranged on the axle tube body, second bosses are formed at both ends of the inner wall of the axle tube body.

[0014] In a second aspect, the present application proposes a trailing axle, including the trailer axle housing as described in any one of the above.

[0015] A trailer axle housing and a trailing axle proposed by the present application relate to the technical field of vehicle parts. Wherein, the trailer axle housing includes: an axle tube body, a first guiding arm, a second guiding arm, a brake backing plate, an ABS bracket seat and a shock absorber seat installation boss; the first guiding arm, the second guiding arm, the brake backing plate and the ABS bracket seat are integrally cast with the axle tube body; wherein, the first guiding arm and the second guiding arm are respectively arranged on both sides of the axis of the axle tube body; brake backing plates are arranged at both ends of the axle tube body; an ABS bracket seat is arranged on the axle tube body close to the brake backing plate; a shock absorber seat installation boss is arranged between the first guiding arm and the second guiding arm close to the axis of the axle tube body. The present application is beneficial to improving the integration degree of the trailer axle housing, avoiding relative movement and wear of each component of the trailer axle housing, beneficial to extending the service life of the trailer axle housing, and without the assistance of bolts and nuts for fixing, which is beneficial to eliminating potential safety hazards caused by loosening of bolts and nuts.

[0016] Other advantages, objects, and features of the present application will be partly reflected by the following description, and partly will be understood by those skilled in the art through the research and practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of exemplary embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the exemplary embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1 FIG. 9 is a structural schematic diagram of a trailer axle housing provided by an embodiment of the present application;

[0019] Figure 2 FIG. 13 is another structural schematic diagram of a trailer axle housing provided by an embodiment of the present application;

[0020] Figure 3 FIG. 17 is yet another structural schematic diagram of a trailer axle housing provided by an embodiment of the present application;

[0021] Figure 4 FIG. 21 is yet another structural schematic diagram of a trailer axle housing provided by an embodiment of the present application;

[0022] Figure 5 FIG. 25 is a cross-sectional schematic diagram of a shaft tube body provided by an embodiment of the present application;

[0023] Figure 6 FIG. 29 is another structural schematic diagram of a trailer axle housing provided by an embodiment of the present application

[0024] Figure 7 FIG. 33 is a structural schematic diagram of a first guide arm provided by an embodiment of the present application;

[0025] Figure 8 FIG. 37 is yet another structural schematic diagram of a trailer axle housing provided by an embodiment of the present application;

[0026] Figure 9 FIG. 41 is a structural schematic diagram of a middle section of a shaft tube body provided by an embodiment of the present application;

[0027] Figure 10 FIG. 45 is yet another structural schematic diagram of a middle section of a shaft tube body provided by an embodiment of the present application.

[0028] Among them, Figures 1 to 10 The corresponding relationship between the reference numerals and the structural names in the drawings is as follows:

[0029] 1. Axle tube body; 2. First guiding arm; 3. Second guiding arm; 4. Brake backing plate; 5. ABS bracket seat; 6. Shock absorber seat mounting boss; 7. Axle head; 8. Oil seal mounting part; 8a. Oil seal seat ring mounting part; 9. Positioning pin;

[0030] 10. Flange; 11. Second boss; 100a. Oval sand outlet hole; 100b. Oblong sand outlet hole; 1001. Second flanging;

[0031] 111a. First fillet; 111b. Second fillet; 111c. Third fillet; 111d. Fourth fillet;

[0032] 21. Connecting end; 22. Supporting end; 23. First flanging;

[0033] 81. First boss. Detailed implementation mode

[0034] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below through the drawings and specific embodiments. It should be understood that the specific features in the embodiments of this specification and the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. Without conflict, the technical features in the embodiments of this specification and the embodiments can be combined with each other.

[0035] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element. The term "more than two" includes two or more than two.

[0036] The trailer axle housing is a key component affecting the vehicle's load-bearing capacity and is mainly used for load-bearing, braking, etc.

[0037] Currently, existing trailer axle housings are mainly assembled from stamping and welding parts, forgings, and a small number of castings. The above methods cause gaps between the components of the trailer axle housing. During vehicle driving, on the one hand, the components of the trailer axle housing are prone to relative movement, causing wear to the components of the trailer axle housing; on the other hand, bolts and nuts are prone to loosening, posing a safety hazard.

[0038] In view of this, an embodiment of the present application provides a trailer axle housing and a trailing axle. Among them, the first guiding arm, the second guiding arm, the brake backing plate and the ABS bracket seat of the trailer axle housing are integrally cast with the axle tube body, which is beneficial to improving the integration degree of the trailer axle housing, avoiding relative movement between the components of the trailer axle housing to form wear, beneficial to extending the service life of the trailer axle housing, and eliminating the need for bolts and nuts to assist in fixing, which is beneficial to eliminating potential safety hazards caused by the loosening of bolts and nuts.

[0039] In the first aspect of the embodiment of the present application, a trailer axle housing is provided. Figures 1-4 As a structural schematic diagram of the trailer axle housing provided by the embodiment of the present application, as Figures 1-4 shown, the trailer axle housing provided by the present application includes: an axle tube body 1, a first guiding arm 2, a second guiding arm 3, a brake backing plate 4, an ABS bracket seat 5, and a shock absorber seat mounting boss 6; the first guiding arm 2, the second guiding arm 3, the brake backing plate 4, the ABS bracket seat 5, and the shock absorber seat mounting boss 6 are integrally cast with the axle tube body 1; among them, the first guiding arm 2 and the second guiding arm 3 are respectively arranged on both sides of the axis of the axle tube body 1; brake backing plates 4 are arranged at both ends of the axle tube body 1; an ABS bracket seat 5 is arranged on the axle tube body 1 close to the brake backing plate 4; a shock absorber seat mounting boss 6 is arranged between the first guiding arm 2 and the second guiding arm 3 close to the axis of the axle tube body 1.

[0040] It should be noted that the first guiding arm 2, the second guiding arm 3, the brake backing plate 4, the ABS bracket seat 5, and the shock absorber seat mounting boss 6 of the trailer axle housing provided by the present application are integrally cast with the axle tube body 1, which is beneficial to reducing the risk of deformation and weld cracking of the trailer axle housing caused by the welding process, improving the integration degree of the trailer axle housing, avoiding relative movement between the components of the trailer axle housing to form wear, extending the service life of the trailer axle housing, and eliminating the need for bolts and nuts to assist in fixing, which is beneficial to eliminating potential safety hazards caused by the loosening of bolts and nuts.

[0041] In some feasible embodiments, the above-mentioned components of the trailer axle housing can adopt the machining method with the same positioning in different machining processes at the same time, which is beneficial to improving the product dimensional tolerance and dimensional matching degree of the components of the trailer axle housing and reducing the assembly difficulty of the trailer axle housing.

[0042] In some feasible embodiments, the above-mentioned trailer axle housing may further include axle heads 7, and the above-mentioned axle heads 7 are integrally cast at both ends of the axle tube body 1 to further improve the integration degree of the components of the trailer axle housing.

[0043] Alternatively, the above-mentioned axle head 7 can also be integrally cast with the above-mentioned axle tube body 1. In this case, the above-mentioned axle head 7 is inserted into both ends of the above-mentioned axle tube body 1, and the above-mentioned axle head 7 and the above-mentioned axle tube body 1 are connected by a positioning pin 9 to limit the movement and / or rotation of the above-mentioned axle head 7 relative to the above-mentioned axle tube body 1. Specifically, the above-mentioned positioning pin 9 can be a cylindrical pin.

[0044] It should be noted that in order to meet the application requirements of the trailer axle housing of the present application for large load conditions, the above-mentioned axle head 7 can be made of high-strength materials. Exemplarily, the above-mentioned high-strength materials can include: high-strength steel, cast steel, and other composite materials, etc.

[0045] In some feasible embodiments, the thickness distribution of the above-mentioned axle head 7 is positively correlated with the stress distribution received by the axle head 7, which is beneficial to improving the stiffness of the axle head 7, enhancing the safety performance of the trailer axle housing, and facilitating the scientific setting of the thickness distribution of the above-mentioned axle head 7 according to the load distribution of each part of the axle head 7. While ensuring the anti-deformation performance of each part of the axle head 7, the weight of the axle head 7 is reduced, thereby reducing the overall weight of the trailer axle housing.

[0046] In some feasible embodiments, the above-mentioned trailer axle housing further includes: an oil seal mounting portion 8.

[0047] It should be noted that the above-mentioned oil seal mounting portion 8 can be arranged on the axle head 7 to increase the strength of the above-mentioned axle head 7 and limit the position of the above-mentioned axle head 7 relative to the above-mentioned axle tube body 1, realizing assembly limit.

[0048] In some feasible embodiments, when the oil seal mounting portion 8 is arranged on the axle head 7, a first boss 81 can be arranged at one end of the oil seal mounting portion 8 close to the axle tube body 1 to limit the movement of the above-mentioned axle head 7 in the horizontal direction and limit the positions of the oil seal mounting portion 8 and the axle head 7 relative to the axle tube body 1. Alternatively, the above-mentioned oil seal mounting portion 8 can also be arranged on the axle tube body 1, wherein the oil seal mounting portion 8, the above-mentioned axle head 7, and the axle tube body 1 are integrally cast, thereby further improving the integration of the above-mentioned trailer axle housing.

[0049] In some feasible embodiments, when the oil seal mounting portion 8 is arranged on the axle tube body 1, second bosses 11 can be formed at both ends of the inner wall of the axle tube body 1 to limit the position of the above-mentioned axle head 7 relative to the above-mentioned axle tube body 1, realizing assembly limit.

[0050] Based on this, on the one hand, the present application can provide various setting methods between the axle head 7, the oil seal installation part 8, and the limiting boss and the axle tube body 1, which is beneficial to enriching the applicable scenarios of the trailer axle housing while ensuring the various functions of the trailer axle housing. On the other hand, the present application uses the boss or the oil seal installation part 8 to limit the axle head 7 and the axle tube body 1, which is beneficial to reducing the components required in the limiting process while improving the integration of the trailer axle housing, without the assistance of bolts and nuts for limiting, which is beneficial to eliminating the safety hazards caused by the loosening of bolts and nuts.

[0051] It should be noted that, alternatively, as Figure 1 shown, in some feasible embodiments, an oil seal seat ring installation part 8a may also be provided between the axle tube body 1 and the axle head 7 to replace the above-mentioned oil seal installation part 8 for cooperating with the oil seal seat ring, and the oil seal seat ring cooperates with the oil seal to enhance the strength of the axle head 7 and limit the position of the above-mentioned axle head 7 relative to the axle tube body 1, thereby realizing assembly limiting.

[0052] In some feasible embodiments, the radial cross-section of the axle tube body 1 is an irregular quadrilateral; wherein, a flange 10 is formed on one side of the axle tube body 1 where the first guiding arm 2 is provided and / or on one side of the axle tube body 1 where the second guiding arm 3 is provided to enable a smooth connection between the axle tube body 1 and the first guiding arm 2 and / or the second guiding arm 3.

[0053] Exemplarily, Figure 5 is a cross-sectional schematic diagram of an axle tube body 1 provided by an embodiment of the present application, Figure 6 is a structural schematic diagram of another trailer axle housing provided by an embodiment of the present application. As Figures 5-6 shown, the radial cross-section of the axle tube body 1 can adopt an irregular quadrilateral structure. Among them, the front section of the upper plane of the axle tube body 1 can be upturned to enable a smooth connection between the first guiding arm 2 and the above-mentioned axle tube body 1, thereby reducing the stress concentration on the first guiding arm 2 and the axle tube body 1. The lower plane of the axle tube body 1 can form a certain angle with the horizontal axis to enable a smooth connection between the second guiding arm 3 and the above-mentioned axle tube body 1, thereby reducing the stress concentration on the second guiding arm 3 and the axle tube body 1.

[0054] In some feasible embodiments, the wall thickness distribution of the axle tube body 1 is positively correlated with the stress distribution of the axle tube body 1, wherein the wall thickness distribution and / or the fillet radius of the four fillets of the irregular quadrilateral, namely the first fillet 111a, the second fillet 111b, the third fillet 111c, and the fourth fillet 111d, are positively correlated with the stress on the four fillets, namely the first fillet 111a, the second fillet 111b, the third fillet 111c, and the fourth fillet 111d.

[0055] It should be noted that, for the parts of the above-mentioned axle tube body 1 that are subjected to relatively large stress, the wall thickness can be increased to improve the strength of the target parts of the axle tube body 1. For the parts of the above-mentioned axle tube body 1 that are subjected to relatively small stress, process holes can be provided to further reduce the weight of the trailer axle housing. Specifically, the wall thickness can be increased at the connection between the above-mentioned axle tube body 1 and the first guiding arm 2 and between the above-mentioned axle tube body 1 and the second guiding arm 3 to increase the strength of the connection.

[0056] Among them, the greater the stress on the four rounded corner parts of the above-mentioned axle tube body 1 corresponding to the irregular quadrilateral, the greater the wall thickness and / or the greater the radius of the rounded corner, so as to increase the strength of the rounded corner of the axle tube body 1.

[0057] Based on this, the trailer axle housing provided by the present application can optimize the stress distribution of the axle tube body 1, optimize the structure of the trailer axle housing, and improve the overall strength of the trailer axle housing while further reducing the weight of the trailer axle housing.

[0058] In some feasible embodiments, the radial cross-section of the first guiding arm 2 is concave, and the cross-sectional area of the radial cross-section gradually decreases from the connection end 21 to the support end 22 of the first guiding arm 2. Among them, a first flanging 23 is formed on the support edge of the first guiding arm 2.

[0059] Exemplarily, Figure 7 is a structural schematic diagram of a first guiding arm 2 provided by an embodiment of the present application. As Figure 7 shown, the radial cross-section of the above-mentioned first guiding arm 2 is bent downward. Specifically, the above-mentioned radial cross-section can be a concave-shaped cross-section that is narrow in the front and wide in the back. The cross-sectional area of the above-mentioned first guiding arm 2 gradually decreases from the connection end 21 to the root end, and the lower support edge of the above-mentioned first guiding arm 2 can adopt a flanging form to further enhance the strength of the above-mentioned first guiding arm 2 and improve the support stability of the trailer axle housing.

[0060] In some feasible embodiments, sand outlet holes are respectively formed on one side of the middle section of the axle tube body 1 where the first guiding arm 2 is provided and on one side of the axle tube body 1 where the second guiding arm 3 is provided. Among them, a second flanging 1001 is formed on the outer edge of the sand outlet hole.

[0061] Exemplarily, Figure 8 is another structural schematic diagram of the trailer axle housing provided by an embodiment of the present application. Figures 9-10 is a structural schematic diagram of the middle section of the axle tube body 1 provided by an embodiment of the present application. As Figures 8-10 shown, 2 oval sand outlet holes 100a can be formed on one side of the middle section of the above-mentioned axle tube body 1 where the first guiding arm 2 is provided, and 1 oblong sand outlet hole 100b can be formed on one side of the middle section of the above-mentioned axle tube body 1 where the second guiding arm 3 is provided. It should be noted that the shape, position, and number of the above-mentioned sand outlet holes can be set according to actual needs and are not specifically limited herein.

[0062] It should be noted that, since the stress on the middle section of the axle tube body 1 is relatively small, opening the above-mentioned sand outlet holes in the middle section of the axle tube body 1 is beneficial to reducing the weight of the axle tube body 1 and optimizing the stress distribution of the axle tube body 1. A second flanging 1001 is formed on the outer edge of the above-mentioned sand outlet holes, which is beneficial to avoiding stress concentration at the sand outlet and optimizing the stress distribution of the axle tube body 1, thereby optimizing the stress distribution of the entire trailer axle housing.

[0063] In a second aspect, the present application provides a trailing axle, which includes the trailer axle housing described in any one of the above.

[0064] It should be noted that those of ordinary skill in the art can understand the specific details and beneficial effects of the trailing axle by reading the above relevant descriptions of the trailer axle housing. For the sake of brevity, they will not be elaborated here.

[0065] It should be noted that in the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application 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 described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

[0067] Although the preferred embodiments of this specification have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of this specification.

[0068] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalent technologies, this specification is also intended to include these modifications and variations.

Claims

1. A trailer axle housing, characterized in that, Comprising: A shaft tube body, a first guiding arm, a second guiding arm, a brake backing plate, an ABS bracket seat, and a shock absorber seat mounting boss; The first guiding arm, the second guiding arm, the brake backing plate, the ABS bracket seat, and the shock absorber seat mounting boss are integrally cast with the shaft tube body; Wherein, the first guiding arm casting and the second guiding arm are respectively arranged on both sides of the axis of the shaft tube body; The brake backing plates are arranged at both ends of the shaft tube body; The ABS bracket seat is arranged on the shaft tube body close to the brake backing plate; A shock absorber seat mounting boss is arranged between the first guiding arm and the second guiding arm close to the axis of the shaft tube body.

2. The trailer axle housing according to claim 1, characterized in that, The radial cross-section of the shaft tube body is an irregular quadrilateral; Wherein, a flange is formed on one side of the shaft tube body where the first guiding arm is arranged and / or on one side of the shaft tube body where the second guiding arm is arranged, so as to achieve a smooth connection between the shaft tube body and the first guiding arm and / or the second guiding arm.

3. The trailer axle housing according to claim 2, wherein, The wall thickness distribution of the shaft tube body is positively correlated with the stress distribution received by the shaft tube body. Among them, the wall thickness distribution and / or the fillet radius of the four fillets of the irregular quadrilateral are positively correlated with the stress received by the four fillets.

4. The trailer axle housing according to claim 2, characterized in that, The radial cross-section of the first guiding arm is concave, and the cross-sectional area of the radial cross-section decreases successively from the connecting end to the supporting end of the first guiding arm. Among them, a first flanging is formed on the supporting edge of the first guiding arm.

5. The trailer axle housing according to claim 1, characterized in that, Sand outlet holes are respectively formed on one side of the middle section of the shaft tube body where the first guiding arm is arranged and on one side of the shaft tube body where the second guiding arm is arranged. Among them, a second flanging is formed on the outer edge of the sand outlet hole.

6. The trailer axle housing according to any one of claims 1 to 5, characterized in that, The trailer axle housing further comprises: axle heads, integrally cast at both ends of the shaft tube body; Or, the axle heads are made of high-strength materials and are inserted at both ends of the shaft tube body. Among them, a positioning pin is arranged between the axle heads and the shaft tube body, and the material thickness distribution of the axle heads is positively correlated with the stress distribution received by the axle heads.

7. The trailer axle housing according to claim 6, wherein, The trailer axle housing further comprises: An oil seal mounting part, arranged on the axle head; Or, the oil seal mounting part is arranged on the shaft tube body, and the oil seal mounting part, the axle head, and the shaft tube body are integrally cast.

8. The trailer axle housing according to claim 7, characterized in that, When the oil seal mounting part is arranged on the axle head, a first boss is arranged at one end of the oil seal mounting part close to the shaft tube body.

9. The trailer axle housing according to claim 8, characterized in that, When the oil seal mounting part is arranged on the shaft tube body, second bosses are formed at both ends of the inner wall of the shaft tube body.

10. A follow-up bridge, characterized in that, Including the trailer axle housing according to any one of claims 1 to 9.

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