Search

CN-122008732-A - Axle tube of heavy-duty vehicle

CN122008732ACN 122008732 ACN122008732 ACN 122008732ACN-122008732-A

Abstract

The axle tube of heavy-duty vehicle is composed of axle tube, square sleeve with two groups of axle tubes and fixed to two ends of internal cavity of axle tube, axle head with two groups of axle tubes, and axle head with one end of axle head and another end extending out of axle tube, and axle head and axle tube. According to the invention, the square sleeve is additionally arranged in the axle tube, an interference fit structure is formed by the square sleeve and the axle head, circumferential butt joint parts of the axle head and the axle tube are fixedly connected into a whole by adopting ring welding, and an integral axle tube structure is formed, so that the effective fit length of the axle tube and the axle head is prolonged, the assembly joint surface and the stress transmission area of the axle tube and the axle head are increased, local high stress can be effectively dispersed, and the structural rigidity and the fatigue resistance of a stress concentration area are effectively improved.

Inventors

  • ZHENG ZHIMING
  • JIANG YULONG

Assignees

  • 辽宁金天马专用车制造有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The axle tube of the heavy-duty vehicle is characterized by comprising an axle tube (1), square sleeves (2) and shaft heads (3), wherein the square sleeves (2) are provided with two groups, and the two groups of square sleeves (2) are respectively and fixedly assembled at two ends of an inner cavity of the axle tube (1), the shaft heads (3) are provided with two groups, one end of each group of shaft heads (3) is in interference fit with the inner cavity corresponding to the square sleeve (2), and the other end of each group of shaft heads extends out of the axle tube (1); The circumferential butt joint part of the shaft head (3) and the shaft tube (1) is fixedly connected into a whole through ring welding, and the square sleeve (2) increases the matching length of the shaft head (3) and the shaft tube (1), so that an axle tube integral structure is formed.
  2. 2. The axle tube of a heavy-duty vehicle according to claim 1, wherein: Four welding holes (4) are formed in the front and rear side walls of the shaft tube (1) in a penetrating mode, the front and rear two welding holes (4) are correspondingly arranged in a group, and the front and rear two corresponding welding holes (4) are connected through plug welding, so that a pin body structure corresponding to the front and rear is formed at the matching position of the shaft tube (1) and the shaft head (3).
  3. 3. The axle tube of a heavy-duty vehicle according to claim 1, wherein: The sleeving and overlapping part of the shaft tube (1) and the shaft head (3) is correspondingly arranged at the mounting position of the brake bottom plate (5) of the heavy-duty vehicle, and the brake bottom plate (5) is welded with the front side, the rear side and the top end of the shaft tube (1) in a segmented mode.
  4. 4. The axle tube of a heavy-duty vehicle according to claim 1, wherein: The shaft tube (1) comprises a tube body (101), a first groove (102) and a second groove (103), wherein the tube body (101) is of a hollow strip-shaped tubular structure, four corners of the inner wall and four corners of the outer wall of the tube body (101) are of round-corner structures, the first groove (102) is obliquely arranged at the end part of the tube body (101), and the second groove (103) is arranged on the inner wall of the tube body (101) and is in smooth transition connection with the first groove (102).
  5. 5. The axle tube for a heavy-duty vehicle of claim 4, wherein: the square sleeve (2) comprises a sleeve body (201), a round hole (202) and a third groove (203), wherein the sleeve body (201) is of a hollow structure, the sleeve body (201) is fixedly arranged in an inner cavity of the shaft tube (1), the round hole (202) penetrates through the sleeve body (201) and forms an integral structure of an outer square and an inner round together with the sleeve body (201), the third groove (203) is obliquely arranged along the circumferential direction of the outer side wall of the sleeve body (201), and the third groove (203) is positioned on one side, close to the shaft head (3), of the sleeve body (201).
  6. 6. The axle tube for a heavy-duty vehicle of claim 5, wherein: the outer diameter of the sleeve body (201) is matched with the inner diameter of the pipe body (101) in shape and size.
  7. 7. The axle tube for a heavy-duty vehicle of claim 5, wherein: The spindle head (3) comprises a spindle section (301), square sheets (302) and an extension shaft section (303), wherein the spindle section (301), the square sheets (302) and the extension shaft section (303) are integrally formed, the extension shaft section (303) is arranged at the end part of the spindle section (301), the square sheets (302) are arranged on the spindle section (301), the extension shaft section (303) and the round hole (202) are in interference fit, and circumferential butt joint parts of the square sheets (302) and the spindle tube (1) are fixedly connected into a whole through ring welding.
  8. 8. The axle tube for a heavy-duty vehicle of claim 7, wherein: The spindle head (3) further comprises a threaded portion (304), a first concave portion (305) and a second concave portion (306), wherein the threaded portion (304) is arranged at the end of the spindle section (301) and is opposite to the extension shaft section (303), the second concave portion (306) is arranged inside the extension shaft section (303), and the first concave portion (305) is arranged at one end, deviating from the extension shaft section (303), of the spindle section (301).
  9. 9. The axle tube of a heavy-duty vehicle according to claim 1, wherein: the shaft head (3) is a high-strength solid steel forging subjected to thermal refining.
  10. 10. The axle tube for a heavy-duty vehicle of claim 1, wherein: the two groups of square sleeves (2) and the two groups of shaft heads (3) are symmetrically arranged left and right by taking the central axis of the shaft tube (1) as a reference.

Description

Axle tube of heavy-duty vehicle Technical Field The invention belongs to the technical field of vehicle axles, and particularly relates to an axle tube of a heavy-duty vehicle. Background At present, axle tubes of a trailer are mainly divided into an integrated axle tube and a welded axle tube. The integrated axle tube adopts an integral molding process, is simple and convenient to process, but has limited structural strength and low bearing tonnage, and is difficult to meet the use requirement of heavy load working conditions, so that the axle tube of the 20-25 ton heavy load vehicle adopts a welded structure. However, as shown in fig. 17, the welding axle tube used in the existing heavy-duty vehicle has a short fitting length between the axle head and the axle tube, and an insufficient fitting area, and the welding area between the axle tube and the axle head is located at the concentrated position of the axle force. Under the action of heavy load, impact and alternating load, the factors easily cause the high stress of the welded joint, the integral fatigue resistance performance is reduced, and finally the fracture failure risk exists at the joint of the shaft tube and the shaft head. Disclosure of Invention Aiming at the problems of short matching length of a shaft head and a shaft tube, insufficient assembling and attaching area and the like of the welding type shaft tube of the existing heavy-duty vehicle in the prior art, the invention provides the shaft tube of the heavy-duty vehicle, wherein a square sleeve is additionally arranged in the shaft tube, an interference fit structure is formed by the square sleeve and the shaft head, and circumferential butt joint parts of the shaft head and the shaft tube are fixedly connected into a whole by adopting ring welding to jointly form an integral shaft tube structure; the structure prolongs the effective matching length of the shaft tube and the shaft head, increases the assembling joint surface and the stressed transfer area of the shaft tube and the shaft head, effectively disperses local high stress, effectively improves the structural rigidity and the fatigue resistance of the stress concentration area, and can better bear the actions of heavy load, impact and alternating load. The specific technical scheme is as follows: The axle tube of the heavy-duty vehicle comprises an axle tube, square sleeves and shaft heads, wherein the square sleeves are provided with two groups, and the two groups of square sleeves are respectively and fixedly assembled at two ends of an inner cavity of the axle tube; The axle head and the circumferential butt joint part of the axle tube are fixedly connected into a whole through ring welding, and the square sleeve increases the matching length of the axle head and the axle tube, so that the axle tube integral structure is formed. In the technical scheme, four welding holes are formed in the front and rear side walls of the shaft tube in a penetrating mode, two welding holes which are opposite in front and rear are arranged in a corresponding mode, and the two corresponding welding holes in the front and rear are connected through plug welding, so that a pin body structure which corresponds to the shaft tube in front and rear is formed at the matching position of the shaft tube and the shaft head. In the technical scheme, the sleeving and overlapping part of the shaft tube and the shaft head is correspondingly arranged at the mounting position of the brake bottom plate of the heavy-duty vehicle, and the brake bottom plate is welded with the front side, the rear side and the top end of the shaft tube in a segmented mode. According to the technical scheme, the shaft tube comprises a tube body, a first groove and a second groove, the tube body is of a hollow long-strip-shaped tubular structure, four corners of the inner wall and four corners of the outer wall of the tube body are of round-corner structures, the first groove is obliquely arranged at the end part of the tube body, and the second groove is arranged on the inner wall of the tube body and is in smooth transition connection with the first groove. According to the technical scheme, the square sleeve comprises a sleeve body, a round hole and a third groove, wherein the sleeve body is of a hollow structure and is fixedly arranged in an inner cavity of the shaft tube, the round hole penetrates through the sleeve body and forms an integral structure of an outer circle and an inner circle together with the sleeve body, the third groove is obliquely arranged along the circumferential direction of the outer side wall of the sleeve body, and the third groove is located at one side, close to the shaft head, of the sleeve body. In the technical scheme, the outer diameter of the sleeve body is matched with the inner diameter of the pipe body in shape and size. According to the technical scheme, the spindle head comprises a spindle section, square sheets and an extension shaft se