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CN-122014775-A - Anti-cracking rubber bushing and preparation method thereof

CN122014775ACN 122014775 ACN122014775 ACN 122014775ACN-122014775-A

Abstract

The application relates to a cracking-resistant rubber bushing and a preparation method thereof, wherein the cracking-resistant rubber bushing comprises a first bushing, a second bushing and a composite elastomer group, wherein the second bushing is coaxially arranged in the first bushing, the composite elastomer group is arranged between the first bushing and the second bushing and axially extends along the second bushing and comprises a plurality of composite elastomers distributed along the circumferential direction, a cavity is arranged between every two adjacent composite elastomers, each composite elastomer comprises an elastic matrix, a reinforcing rib net and a bonding layer, the reinforcing rib net is wound outside the elastic matrix in a prestress state, and the bonding layer is arranged between the elastic matrix and the first bushing and between the elastic matrix and the second bushing. By winding the reinforcing rib net on the surface of the elastic matrix with preset tension, a continuous precompression stress field is applied to the elastic matrix, and when tensile stress generated by external load acts on the elastic body, the precompression stress needs to be counteracted at first, so that the net tensile stress actually born by the elastic body is greatly reduced, and the cracking threshold is remarkably improved.

Inventors

  • WANG LUN
  • SU HUAFEI
  • SHEN DENGKE
  • SONG JIANHUA
  • MA HAILONG

Assignees

  • 岚图汽车科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. A crack resistant rubber bushing, comprising: A first sleeve (1); the second sleeve (2) is coaxially arranged in the first sleeve (1); The compound elastomer group sets up between first sleeve pipe (1) and second sleeve pipe (2), and follows first sleeve pipe (1) axial extension, including a plurality of edges second sleeve pipe (2) circumference distribution's compound elastomer (3), adjacent be equipped with cavity (4) between compound elastomer (3), every compound elastomer (3) include: -an elastic matrix (301); -a web of reinforcing ribs (302) wound in a pre-stressed state outside said elastic matrix (301); -an adhesive layer (303) placed outside the web (302) of reinforcing ribs, between the elastic matrix (301) and the first sleeve (1), and between the elastic matrix (301) and the second sleeve (2).
  2. 2. A crack resistant rubber bushing as recited in claim 1, wherein, The web (302) comprises: a plurality of first stirrups (3021), wherein the plurality of first stirrups (3021) are arranged outside the elastic base body (301) in a parallel and spaced mode along the axial direction of the elastic base body (301).
  3. 3. The crack resistant rubber bushing of claim 2 wherein: the web (302) further comprises: A plurality of second stirrups (3022), wherein the second stirrups (3022) are arranged outside the elastic base body (301) at intervals along the elastic base body (301); Wherein the plane of the first stirrup (3021) is perpendicular to the plane of the second stirrup (3022).
  4. 4. The crack resistant rubber bushing of claim 1 wherein: the two ends of the second sleeve (2) axially extend out of the end parts of the composite elastic body group by 3-10 mm respectively.
  5. 5. The crack resistant rubber bushing of claim 1 wherein: The cavity (4) is internally provided with a limiting rib (5), and the limiting rib (5) is connected with the inner wall of the first sleeve (1) and extends along the axial direction of the first sleeve (1) and protrudes towards the outer wall of the second sleeve (2).
  6. 6. The crack resistant rubber bushing of claim 5 wherein: The cross section of the limiting rib (5) is trapezoid or semicircular, a gap is arranged between the top end of the limiting rib and the outer wall of the second sleeve (2), and the size of the gap is smaller than the radial compression amount of the composite elastic body (3) under the maximum design load.
  7. 7. The crack resistant rubber bushing of claim 1 wherein: The bonding layer (303) is a cured adhesive layer.
  8. 8. The crack resistant rubber bushing of claim 1 wherein: The reinforcing rib net (302) is a mixed fiber bundle of aramid fiber and carbon fiber.
  9. 9. A method of producing the crack resistant rubber bushing as claimed in any one of claims 1 to 8, comprising the steps of: Coating the inner wall of the first sleeve (1) and the outer wall of the second sleeve (2) with a vulcanization adhesive; applying a vulcanization adhesive to the surface of the preformed elastic substrate (301); after the reinforcing rib net (302) is fully soaked in rubber cement, uniformly winding the rubber cement on the surface of the elastic matrix (301) with preset tension to form an elastic body prefabricated body of the pre-buried reinforcing rib net (302); Loading said first sleeve (1), said second sleeve (2) and a plurality of said elastomeric preforms into a vulcanization mold and placing a shaping mandrel between adjacent elastomeric preforms to form said cavity (4); And (3) heating, pressurizing and vulcanizing the mold, and demolding after vulcanization is completed to obtain the cracking-resistant rubber bushing.
  10. 10. The method for preparing the cracking-resistant rubber bushing according to claim 9, wherein: The mass mixing ratio of the aramid fiber to the carbon fiber in the reinforcing rib net (302) is 1:0.5-1:2.

Description

Anti-cracking rubber bushing and preparation method thereof Technical Field The application relates to the technical field of rubber bushings, in particular to an anti-cracking rubber bushing and a preparation method thereof. Background The rubber bushing is used as a key elastic connecting element and is widely applied to automobile suspension systems, power assembly suspensions and various industrial vibration reduction structures. Under actual working conditions, the rubber bushing needs to bear complex multidirectional loads, including axial force, radial force, torsion moment and compound action thereof. Particularly under the condition of high load or high-frequency reciprocating motion, the stress concentration is easily generated in the rubber elastomer. After long-term service, the stress concentration areas can initiate the initiation and the expansion of microscopic cracks, and finally the fatigue damage phenomena such as cracking of the rubber bushing, debonding of the rubber and the sleeve and the like are caused. Once the bushing fails, it directly affects the operating stability, ride comfort, and even poses a safety risk. To solve the above problems, the prior art generally improves the tear strength of the rubber material itself by optimizing the formulation of the rubber material, for example by adding reinforcing fillers, anti-aging agents or by using new rubber systems to improve the tear strength and fatigue resistance of the rubber matrix itself. However, simple material modification has inherent limitations, and it is difficult to suppress crack generation. Disclosure of Invention The embodiment of the application provides a cracking-resistant rubber bushing and a preparation method thereof, which are used for solving the inherent limitation of simple material modification in the related art and are difficult to inhibit the occurrence of cracks of the rubber bushing. In a first aspect, there is provided a crack resistant rubber bushing comprising: A first sleeve; the second sleeve is coaxially arranged in the first sleeve; The compound elastomer group sets up between first sleeve pipe and second sleeve pipe, and follows first sleeve pipe axial extension, including a plurality of edges second sleeve pipe circumference distribution's compound elastomer is equipped with the cavity between the adjacent compound elastomer, every compound elastomer includes: -an elastic matrix; -a web of reinforcing bars wound in a pre-stressed state outside said elastomeric matrix; -an adhesive layer, placed outside the web of reinforcing ribs, between the elastic matrix and the first sleeve, and between the elastic matrix and the second sleeve. In some embodiments, the stiffener mesh comprises: The first stirrups are axially spaced along the elastic matrix and are arranged outside the elastic matrix in parallel in a surrounding mode. In some embodiments, the stiffener web further comprises: The second stirrups are arranged outside the elastic matrix at intervals along the elastic matrix; The plane where the first stirrup is located is perpendicular to the plane where the second stirrup is located. In some embodiments, two ends of the second sleeve axially extend out of the end of the composite elastomer set by 3-10 mm respectively. In some embodiments, a limiting rib is disposed in the cavity, and the limiting rib is connected with the inner wall of the first sleeve, extends along the axial direction of the first sleeve, and protrudes toward the outer wall of the second sleeve. In some embodiments, the cross section of the limiting rib is trapezoid or semicircular, a gap is arranged between the top end of the limiting rib and the outer wall of the second sleeve, and the size of the gap is smaller than the radial compression amount of the composite elastomer under the maximum design load. In some embodiments, the tie layer is a cured adhesive layer. In some embodiments, the reinforcing mesh is a mixed fiber bundle of aramid fibers and carbon fibers. In a second aspect, a method for preparing a crack resistant rubber bushing is provided, comprising the steps of: Coating a vulcanization adhesive on the inner wall of the first sleeve and the outer wall of the second sleeve; Coating a vulcanization adhesive on the surface of the preformed elastic matrix; After the reinforcing rib net is completely soaked in the rubber cement, uniformly winding the rubber cement on the surface of the elastic matrix with preset tension to form an elastic body preform embedded with the reinforcing rib net; loading said first sleeve, said second sleeve and a plurality of said elastomeric preforms into a vulcanization mold and placing a forming mandrel between adjacent elastomeric preforms to form said cavity; And (3) heating, pressurizing and vulcanizing the mold, and demolding after vulcanization is completed to obtain the cracking-resistant rubber bushing. In some embodiments, the mass mixing ratio of the aramid fiber to the car