阅读说明：本技术 提高板簧衬套抗撕裂能力和扭转性能的方法及板簧衬套 (Method for improving tear resistance and torsion performance of plate spring bushing and plate spring bushing ) 是由 艾敏 李晓晔 刘峰 钟海兵 郭春杰 荆问宇 于 2021-09-26 设计创作，主要内容包括：一种提高板簧衬套抗撕裂能力和扭转性能的方法及板簧衬套,采用橡胶金属硫化一体的板簧衬套,并将硫化体的橡胶弹性体内面复合在自润滑套管上,再将自润滑套管压装在内套管上；同时将硫化体的外瓦盖分成两片分瓣梯形子口相匹配结构,在外瓦盖的两端设置压环,压环过盈装配于内套管上并插入硫化体空腔；本发明通过控制两端的压环和外瓦盖两片分瓣梯形子口相对位置,实现橡胶弹性体的轴向窜动和径向变形限位,增大安装接触面积提升螺栓预紧力,并通过自润滑衬套有润滑和耐磨涂层,避免扭转时橡胶层磨耗和金属摩擦异响,从而提升螺栓预紧力来提升板簧衬套橡胶抗撕裂能力和扭转性能。(A method for improving the tearing resistance and torsion performance of a plate spring bushing and the plate spring bushing are disclosed, wherein the plate spring bushing is integrally vulcanized by rubber and metal, the inner surface of a rubber elastic body of a vulcanized body is compounded on a self-lubricating sleeve, and then the self-lubricating sleeve is pressed on an inner sleeve; simultaneously, dividing an outer tile cover of the vulcanized body into two split trapezoid sub-opening matched structures, arranging compression rings at two ends of the outer tile cover, and assembling the compression rings on the inner sleeve in an interference manner and inserting the compression rings into a cavity of the vulcanized body; according to the invention, the relative positions of the two split trapezoid sub-openings of the compression ring and the outer tile cover at two ends are controlled, so that the axial movement and radial deformation limit of the rubber elastomer are realized, the installation contact area is increased, the pretightening force of the bolt is improved, the lubricating and wear-resistant coating is arranged on the self-lubricating bushing, the rubber layer abrasion and metal friction abnormal sound during torsion are avoided, and the pretightening force of the bolt is improved to improve the rubber tearing resistance and the torsion performance of the plate spring bushing.)

1. A method for improving the tear resistance and the torsion performance of a plate spring bushing is characterized in that: adopting a rubber metal vulcanized integral plate spring bushing, compounding the inner surface of a rubber elastic body of a vulcanized body on a self-lubricating sleeve, and pressing the self-lubricating sleeve on an inner sleeve; simultaneously, dividing an outer tile cover of the vulcanized body into two split trapezoid sub-opening matched structures, arranging compression rings at two ends of the outer tile cover, and assembling the compression rings on the inner sleeve in an interference manner and inserting the compression rings into a cavity of the vulcanized body; the compression rings at two ends compress the two split trapezoidal sub-openings of the outer tile cover, so that the axial movement and radial deformation of the rubber elastic body are limited, the pre-tightening force of the lifting bolt for the installation area is increased, the self-lubricating bushing has a lubricating and wear-resistant coating to avoid rubber layer abrasion and metal friction abnormal sound, and the pre-tightening force of the lifting bolt is used for improving the anti-tearing performance of the plate spring bushing.

2. The method of improving the tear resistance and torsion performance of a leaf spring bushing according to claim 1, wherein: compression ring through both ends to two trapezoidal rim of partial sections of outer tile lid compress is the outer tile lid that adopts two lamella formula structures, and the side of each lamella is trapezoidal rim of partial section structure, trapezoidal side is mutually supported when two lamellas are closed and is formed a trapezoidal faying face, the trapezoidal rim of partial section outer tile lid cooperates in the outmost that is located the leaf spring bush, it leaves the clearance to vulcanize through rubber between two outer tile lids of partial section, realize the axial precompression of rubber body through the clamping ring when closing up after the clamping ring pressure equipment, it is spacing to realize rubber elastomer's axial float and radial deformation, increase installation area promotes the bolt pretightning force.

3. The method of improving the tear resistance and torsion performance of a leaf spring bushing according to claim 2, wherein: the side surfaces of the trapezoids are matched with each other to form a trapezoidal combined surface when the two segments are combined, the side surfaces of the outer tile covers of the two split trapezoids are of a three-section structure in radial distribution, straight-line segments which are distributed at different angles are close to the two ends of the outer tile covers, the middle of the straight-line segments at the two ends are connected through a transition section to form a Z-shaped side surface, the side surfaces of the outer tile covers of the two split trapezoids are just in opposite matching, and when the outer tile covers of the two split trapezoids are combined to form a Z-shaped interface gap of the two side surfaces.

4. The method of improving the tear resistance and torsion performance of a leaf spring bushing according to claim 2, wherein: the transition section is a straight line or a curve, the axial play of the plate spring bushing is reduced by adjusting the profile of the transition section or the angle between the profile of the transition section and the straight line at two ends, and the required axial and radial matching rigidity is adjusted.

5. The method of improving the tear and torsion resistance of a leaf spring bushing according to claim 4, wherein: the two split outer tile covers are provided with a gap through rubber vulcanization, when the two split outer tile covers of the trapezoidal sub-opening are combined together, a Z-shaped interface gap of two side surfaces is just formed, the gap is filled by rubber vulcanization, and the compression amount and the matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

6. The method of improving the tear and torsion resistance of a leaf spring bushing according to claim 5, wherein: have lubricated and wear-resistant coating through self-lubricating bush and avoid rubber layer wearing and tearing and metal friction abnormal sound to adopt open-ended self-lubricating sleeve pipe, and there are tin copper sintered layer and PTFE filler coating at self-lubricating sleeve pipe internal surface, the open-ended self-lubricating sleeve pipe that will have tin copper sintered layer and PTFE coating blocks on interior sleeve pipe with interference fit mode, realize when the super moment of torsion is rotatory, vulcanize the body mutually through having lubricated slip between the internal sleeve pipe, avoid rubber layer wearing and tearing and metal friction abnormal sound, prevent that rubber from tearing.

7. The method of improving the tear and torsion resistance of a leaf spring bushing according to claim 6, wherein: the determination of the over-torque value can adjust the initial sliding moment value by adjusting the thickness of the self-lubricating sleeve and the interference with the inner sleeve.

8. A leaf spring bushing according to the method for improving the tear resistance and torsion performance of a leaf spring bushing according to claims 1-6, comprising a carcass and a vulcanized body, characterized in that: the framework is formed by assembling two baffle rings and an inner sleeve; the vulcanized body is press-mounted on the inner sleeve in an interference fit manner and is positioned between the two retaining rings; the vulcanized body comprises a self-lubricating sleeve, a split outer tile cover, a spacer and a rubber elastomer; the vulcanizing body is of a structure with two ends of the vulcanizing body being internally contracted, and the baffle ring is inserted into the cavity of the vulcanizing body to form matching.

9. The leaf spring bushing according to claim 8, wherein: the stop ring is of a T-shaped structure, is assembled in the inner sleeve in an interference mode and is inserted into the cavity of the vulcanizing body, the axial movement and radial deformation limiting of the vulcanizing body are achieved, and the mounting area is increased, so that the pre-tightening force of the bolt is improved.

10. The leaf spring bushing according to claim 8, wherein: the split outer tile cover and the self-lubricating sleeve are provided with openings, and the split outer tile cover and the self-lubricating sleeve are distributed in a 90-degree cross mode in the opening direction.

11. The leaf spring bushing according to claim 8, wherein: the inner surface of the self-lubricating sleeve is provided with a tin-copper sintered layer and a PTFE (polytetrafluoroethylene) filling coating, and the self-lubricating sleeve is press-mounted on the inner sleeve in an interference fit manner.

12. The leaf spring bushing according to claim 8, wherein: the split outer tile cover is of a sub-opening matching structure, when the outer tile covers of two split trapezoid sub-openings are combined to form a Z-shaped interface gap of two side faces, the gap is filled by rubber vulcanization, and the compression amount and matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

13. The leaf spring bushing according to claim 8, wherein: the inner sleeve is subjected to surface carbonitriding and hardening treatment.

Technical Field

The invention relates to a method for improving the performance of a plate spring bushing and the plate spring bushing thereof, in particular to a method for improving the tear resistance and the torsion performance of the plate spring bushing and the plate spring bushing thereof.

Background

The plate spring bushing is an important component of a plate spring system and is used for flexibly connecting a plate spring and a frame, and the plate spring bushing systems have the function of absorbing high-frequency vibration through structure and composition, and meanwhile have certain protection effect on the plate spring in the running process of the plate spring, so that the excessive deformation and large stress concentration of the plate spring caused by the unevenness of a road are avoided.

Because the leaf spring can swing around the connecting point and transmit the action of traction braking force in the application process, the leaf spring bushing needs to provide large-angle torsion and radial bearing capacity, and axial movement and disengagement cannot occur.

The traditional plate spring bushing structure is in a copper bush greasing and lubricating mode, can realize large-angle torsion and radial bearing capacity, needs frequent maintenance and greasing, and is easy to generate abnormal sound caused by foreign matter invasion or dry friction; in order to realize maintenance-free, a sleeve structure made of materials such as nylon, polyurethane, rubber and the like is produced, and the structural form has certain buffering and wear-resisting effects, but the bearing capacity is insufficient, and the sleeve structure is easy to wear and lose efficacy; at present, the rubber metal vulcanization integrated bushing is used for connecting a plate spring frame, has the effect of absorbing high-frequency vibration and flexible connection, and has certain heavy-load capacity, but the connection failure condition caused by tearing of the rubber body is caused by a large torsion angle in the use process, and the service life is short relative to a copper sleeve structure.

In summary, the existing solutions for leaf spring bushings are not sufficient to satisfy both the requirements of large torsion angle and heavy duty fatigue, and therefore there is a need for improvement.

Patent documents in which the same technology as that of the present invention is not found through patent search are reported, and the following patents which have a certain relationship with the present invention are mainly included:

1. the application number is CN202021800832.9, which is named as 'a plate spring bushing', the application number is Chinese utility model patent of Zhejiang city automobile parts Limited, the patent discloses a plate spring bushing, which comprises an inner sleeve, an outer sleeve, a rubber filling layer and an end cover, wherein a buffer part is arranged on the end cover, the buffer part comprises a top plate, elastic connecting plates arranged at two sides of the top plate, a bottom plate arranged on the elastic connecting plates and elastic strips arranged on the bottom plate; when the plate spring bush receives the impact, the top plate is firstly extruded, the top plate extrudes the elastic strip, and then the impact is absorbed through the deformation of the elastic strip, so that the impact is reduced, and the service life of the plate spring bush is prolonged.

2. The application number is CN201710769364.X, entitled "a plate spring bushing assembly", the application person is a Chinese invention patent of Jianghuai automobile group, Inc., in Anhui, the patent discloses a plate spring bushing assembly, which comprises two outer bushings, two inner bushings and a shaft tube; the two outer bushings are sleeved on the shaft tube, and the two inner bushings are respectively arranged between the outer bushings and the shaft tube from two ends of the shaft tube; the outer bushing comprises an inner cylinder and a rubber layer, and the rubber layer is vulcanized on the outer side surface of the inner cylinder; the rubber layer comprises a cylindrical main body, and a plurality of small protrusions are arranged on the side surface of the cylindrical main body in the axial direction. The interference between the end part of the leaf spring eye and the leaf spring bracket is avoided; a non-metal part is adopted, so that the weight is reduced; the interference magnitude is small, the moment of the plate spring relative to the plate spring support is reduced when the vehicle runs, and the running smoothness of the vehicle is improved; the disassembly and the replacement are convenient during maintenance; eliminating noise when the plate spring moves.

3. The application number is CN201721089258.9, which is named as 'buffering and noise-reducing leaf spring bushing of heavy truck axle frame', the applicant is a Chinese utility model patent of Xihua rubber Limited company, Xihua, Xiyang, the patent discloses a buffering and noise-reducing leaf spring bushing of heavy truck axle frame, which is provided with a bushing body, the bushing body is formed by matching and installing three parts of a mandrel, an outer sleeve and a rubber elastic body, and the rubber elastic body is lined between the mandrel and the outer sleeve; the mandrel is a cylindrical optical axis hollow structure made of metal, the rubber elastic body sleeved on the outer wall of the mandrel is of a circular tubular structure with a certain wall thickness, and the outer sleeve sleeved on the outer wall of the rubber elastic body is of an integral type ring-wrapped metal structure wrapping the end faces of outer rings at two ends of the rubber elastic body and the wall surface of an outer cylinder.

4. The application number is CN201410347857.0, the name is 'automobile plate spring bush', the application is the Chinese invention patent of Ningguo Tianyun rubber and plastic products Limited company, the patent discloses an automobile plate spring bush, which belongs to an automobile suspension elastic element, and the automobile plate spring bush comprises an inner sleeve, an outer sleeve, a filling rubber layer and a check ring, wherein, the outer surface of the inner sleeve is an arc protruding outwards on the axial section of the bush, the inner surface of the outer sleeve is an arc protruding inwards on the axial section of the bush, a high damping alloy layer is arranged between the inner sleeve and the outer sleeve, the filling rubber layer is filled between the inner sleeve and the high damping alloy layer and between the outer sleeve and the high damping alloy layer, the inner sleeve is a hollow cylinder structure with steps at two ends, the diameter of the two ends is smaller than the diameter of the middle part of the inner sleeve, and the two ends of the inner sleeve are respectively provided with the check ring to be sleeved on the steps of the inner sleeve.

Through careful analysis of the above patents, although some problems of the leaf spring bushing and some improved technical solutions have been proposed, through careful analysis, these patents still adopt some simple methods to provide elastic damping and shock-absorbing performance, but the problem of connection failure caused by tearing of the rubber body due to large torsion angle is not effectively solved, and axial play and pull-out are easy to occur, and the systematic consideration is lacked; the existing solutions for leaf spring bushings are not sufficient to satisfy both the requirements of large torsion angle and heavy duty fatigue, so the problems mentioned above still exist, and further research and improvement are needed.

Disclosure of Invention

The invention aims to provide a novel method for resisting tearing of a plate spring bushing and the plate spring bushing, aiming at the defects that the existing plate spring bushing has a large torsion angle, so that the rubber body is torn to cause connection failure and axial movement and separation are easy to occur; the method for tearing the plate spring bushing and the plate spring bushing can effectively solve the problem of connection failure caused by tearing of the rubber body due to a large torsion angle, and can effectively prevent axial movement and separation, so that the service life of the plate spring bushing is prolonged.

In order to achieve the purpose, the invention provides a method for improving the tear resistance and the torsion performance of a plate spring bushing, wherein the plate spring bushing is integrally vulcanized by rubber and metal, the inner surface of a rubber elastic body of a vulcanized body is compounded on a self-lubricating sleeve, and then the self-lubricating sleeve is pressed on an inner sleeve; simultaneously, dividing an outer tile cover of the vulcanized body into two split trapezoid sub-opening matched structures, arranging compression rings at two ends of the outer tile cover, and assembling the compression rings on the inner sleeve in an interference manner and inserting the compression rings into a cavity of the vulcanized body; the compression rings at two ends compress the two split trapezoidal sub-openings of the outer tile cover, so that the axial movement and radial deformation of the rubber elastic body are limited, the pre-tightening force of the lifting bolt for the installation area is increased, the self-lubricating bushing has a lubricating and wear-resistant coating to avoid rubber layer abrasion and metal friction abnormal sound, and the pre-tightening force of the lifting bolt is used for improving the anti-tearing performance of the plate spring bushing.

Furthermore, the compression of the two split trapezoidal sub-openings of the outer tile cover by the compression rings at the two ends adopts the outer tile cover with a two-piece structure, the side surface of each split is of a trapezoidal sub-opening structure, the trapezoidal side surfaces are mutually matched to form a trapezoidal joint surface when the two split outer tile covers are combined, the trapezoidal sub-openings of the two split outer tile covers are matched with the outermost layer of the plate spring bushing, a gap is reserved between the two split outer tile covers through rubber vulcanization, the axial precompression of a rubber body is realized through the compression rings when the compression rings are folded after press mounting, the axial movement and radial deformation limitation of the rubber elastomer are realized, and the pre-tightening force of the bolt is improved by increasing the mounting area.

Further, the trapezoidal side surfaces are matched with each other to form a trapezoidal combined surface when the two split trapezoidal sub-openings are combined, the side surfaces of the outer tile covers of the two split trapezoidal sub-openings are of a three-section structure in radial distribution, straight-line segments which are distributed at different angles are close to the two ends, the straight-line segments at the two ends are connected through a transition section to form a Z-shaped side surface, the side surfaces of the outer tile covers of the two split trapezoidal sub-openings are in exact opposite matching, and when the outer tile covers of the two split trapezoidal sub-openings are combined to form a Z-shaped interface gap of the two side surfaces, the Z-shaped interface gap is in exact formation.

Furthermore, the transition section is a straight line or a curve, the axial play of the plate spring bushing is reduced by adjusting the profile of the transition section or the angle between the profile of the transition section and the straight line at two ends, and the required axial and radial matching rigidity is adjusted.

Furthermore, a gap is reserved between the two split outer tile covers through rubber vulcanization, when the two split outer tile covers of the trapezoidal sub-opening are combined to form a Z-shaped interface gap of two side surfaces, the gap is filled by rubber vulcanization, and the compression amount and the matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

Furthermore, the self-lubricating bushing with the lubricating and wear-resistant coating for avoiding the rubber layer abrasion and the metal friction abnormal sound is an open-ended self-lubricating bushing, the tin-copper sintered layer and the PTFE coating are arranged on the inner surface of the self-lubricating bushing, the open-ended self-lubricating bushing with the tin-copper sintered layer and the PTFE coating is clamped on the inner bushing in an interference fit mode, and the vulcanized body is prevented from being torn through the lubricating sliding between the inner bushing and the vulcanized body when the super-torque is rotated.

Further, the determination of the over-torque value can adjust the initial sliding moment value by adjusting the thickness of the self-lubricating sleeve and the interference with the inner sleeve.

A plate spring bushing comprises a framework and a vulcanizing body, wherein the framework is formed by assembling two baffle rings and an inner sleeve; the vulcanized body is press-mounted on the inner sleeve in an interference fit manner and is positioned between the two retaining rings; the vulcanized body comprises a self-lubricating sleeve, a split outer tile cover, a spacer and a rubber elastomer; the vulcanizing body is of a structure with two ends of the vulcanizing body being internally contracted, and the baffle ring is inserted into the cavity of the vulcanizing body to form matching.

Furthermore, the baffle ring is of a T-shaped structure, is assembled in the inner sleeve in an interference mode and is inserted into the cavity of the vulcanizing body, the axial movement and radial deformation limiting of the vulcanizing body are achieved, and the mounting area is increased to improve the pretightening force of the bolt.

Furthermore, the split outer tile cover and the self-lubricating sleeve are provided with openings, and the split outer tile cover and the self-lubricating sleeve are distributed in a 90-degree cross mode in the opening direction.

Furthermore, the inner surface of the self-lubricating sleeve is provided with a tin-copper sintered layer and a PTFE coating, and the self-lubricating sleeve is press-mounted on the inner sleeve in an interference fit manner.

Furthermore, the split outer tile cover is of a sub-opening matching structure, when the outer tile covers of the two split trapezoid sub-openings are combined to form a Z-shaped interface gap of the two side surfaces, the gap is filled by rubber vulcanization, and the compression amount and the matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

Furthermore, the inner sleeve is subjected to surface carbonitriding and hardening treatment.

The invention has the advantages that:

the invention adopts a plate spring bushing which is integrally vulcanized by rubber and metal, the inner surface of a rubber elastic body of a vulcanized body is compounded on a self-lubricating sleeve, and then the self-lubricating sleeve is pressed on an inner sleeve; simultaneously, dividing an outer tile cover of the vulcanized body into two split trapezoid sub-opening matched structures, arranging compression rings at two ends of the outer tile cover, and assembling the compression rings on the inner sleeve in an interference manner and inserting the compression rings into a cavity of the vulcanized body; the compression ring through both ends is to the trapezoidal rim of two split lamellas of outer tile lid compression, realizes that rubber elastomer's axial float and radial deformation are spacing, and increase installation area hoisting bolt pretightning force to there is lubrication and wear-resistant coating to avoid rubber layer wearing and tearing and metal friction abnormal sound through the self-lubricating bush, thereby hoisting bolt pretightning force promotes the anti-tear performance of leaf spring bush, has following advantage:

1. when the plate spring bushing is used, the rubber vulcanized body can realize relative rotation under a large load through the self-lubricating sleeve, an excess torsion angle can be provided, the torsion angle can reach 360 degrees under the limit condition, the rubber body is not influenced, and the service life of the plate spring bushing can be greatly prolonged.

2. The design of the self-lubricating sleeve of the plate spring bushing increases the PTFE lubricating layer and the tin-copper wear-resistant coating, and can avoid the rubber layer abrasion and the abnormal sound caused by the mutual friction of metals under relative rotation.

3. The matching design of the sub-openings of the split outer bush covers of the plate spring bush can reduce the axial movement of the bush caused by the axial component force in the bearing process.

4. The T-shaped baffle ring structure design of the plate spring bushing can integrate axial direction, radial direction and deflection limiting, and can effectively increase the installation area of the bolt and promote friction force.

5. The opening design of the self-lubricating sleeve of the plate spring bushing can adjust the initial sliding moment value by adjusting the thickness of the self-lubricating sleeve and the interference magnitude with the inner sleeve.

Drawings

Fig. 1 is a sectional view schematically showing a leaf spring bush according to a first embodiment of the present invention;

FIG. 2 is an isometric view of the leaf spring bushing of FIG. 1;

FIG. 3 is a sectional view of a vulcanized body according to a first embodiment of the present invention;

FIG. 4 is a schematic isometric view of the vulcanizate shown in FIG. 3;

FIG. 5 is a sectional view of the self-lubricating sleeve according to the first embodiment of the invention;

FIG. 6 is an isometric illustration of the self-lubricating sleeve shown in FIG. 5;

FIG. 7 is a schematic structural view of a split outer cap according to a first embodiment of the present invention;

FIG. 8 is an isometric illustration of the split outer cap mouth fit shown in FIG. 7;

FIG. 9 is a sectional view of a T-shaped retainer ring according to a first embodiment of the present invention;

FIG. 10 is an isometric illustration of the T-ring of FIG. 9;

FIG. 11 is a functional curve test chart of the present invention.

Illustration of the drawings:

the novel rubber gasket comprises, by weight, 1-T-shaped retaining ring, 2-inner sleeve, 3-vulcanized body, 4-cavity, 5-split outer tile cover, 6-self-lubricating sleeve, 7-rubber body, 8-PTFE coating, 9-tin-copper wear-resistant layer, 10-steel sleeve, 11- 'Z' -shaped middle section, 12- 'Z' -shaped seam allowance, 13-opening position, 14-seam allowance gap, 15-boss and 16-outer ring.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

Example one

As can be seen from the attached drawings 1-9, the invention relates to a plate spring bushing, which comprises a T-shaped baffle ring 1, an inner sleeve 2 and a vulcanizing body 3, wherein the T-shaped baffle ring 1 is of a circular ring structure with a T-shaped section; the inner sleeve 2 is a surface-hardened tubular structure; the vulcanized body 3 comprises a split outer tile cover 5, a self-lubricating sleeve 6 and a rubber body 7, wherein the rubber body 7 is of a multilayer rubber structure, and the rubber body 7 and the self-lubricating sleeve 6 are contracted inwards to form a cavity 4; the inner sleeve 2 is pressed into an inner hole of the vulcanized body 3 in an interference fit manner; the T-shaped baffle rings 1 are assembled at two ends of the inner sleeve 2 in an interference manner.

In the embodiment, the two split outer tile covers 5 are matched with the outermost layer of the plate spring bushing, the two split outer tile covers 5 are matched with the staggered Z-shaped seam allowance 12, a gap is reserved between the two split outer tile covers 5, the pre-compression of the rubber body can be realized by folding after press mounting, the width of the Z-shaped seam allowance gap 14 can be adjusted, and the compression amount and the matching rigidity of the rubber body can be adjusted by the molded surface and the angle of the Z-shaped middle section 11. The width of the seam allowance 14 is 1.5-6 mm; the middle section 11 of the Z shape can be a straight line section or an arc line section, and the included angle a formed by the middle section can be 0-60 degrees, and preferably 10-45 degrees; the inventors have found that this results in good radial and axial and yaw stiffness.

The self-lubricating sleeve 6 is of an opening structure, and the opening position 13 and the Z-shaped sub-opening 12 of the two split outer tile covers 5 are arranged in a clearance staggered mode, so that rigidity matching is facilitated, and stress concentration is reduced; the self-lubricating sleeve 6 consists of a PTFE coating 8, a tin-copper wear-resistant layer 9 and a steel sleeve 10, the PTFE coating 8 covers and is filled in a hole on the surface of the tin-copper wear-resistant layer 9 to realize a self-lubricating function, the steel sleeve 10 ensures the interference fit of the self-lubricating sleeve 6 and the inner sleeve 2, and the vulcanized body 3 can slide relative to the inner sleeve 2 after the super-torque moment is realized under the control of the interference fit of 300Nm, so that a plate spring bush is provided with a function curve shown in figure 11; therefore, the condition of over-torque moment can be effectively ensured to prevent the rubber part of the vulcanizing body 3 from being damaged.

The T-shaped baffle ring 1 is filled in the cavities 4 at the two ends of the vulcanized body 3, the boss 15 of the T-shaped baffle ring 1 is pressed into the inner diameter of the two split outer tile covers 5 and abuts against the end surface of the self-lubricating sleeve 6, and the outer ring 16 of the T-shaped baffle ring 1 abuts against the outer end surfaces of the two split outer tile covers 5, is used for stopping the axial movement of the rubber body, and also plays roles in limiting radial, axial and deflection and adjusting compression force; in addition, the T-shaped baffle ring 1 wraps the inner sleeve 2 to increase the installation contact area, so that the friction force is increased, and the deflection rigidity is improved.

Example two

The principle of the second embodiment is the same as that of the first embodiment, but the combination structure is slightly different, and as can be seen from the attached figure 7, the invention relates to a plate spring bushing, which comprises a framework and a vulcanized body, wherein the framework is formed by assembling two baffle rings and an inner sleeve; the vulcanized body is press-mounted on the inner sleeve in an interference fit manner and is positioned between the two retaining rings; the vulcanized body comprises a self-lubricating sleeve, a split outer tile cover, a spacer and a rubber elastomer; the vulcanizing body is of a structure with two ends of the vulcanizing body being internally contracted, and the baffle ring is inserted into the cavity of the vulcanizing body to form matching.

Furthermore, the baffle ring is of a T-shaped structure, is assembled in the inner sleeve in an interference mode and is inserted into the cavity of the vulcanizing body, the axial movement and radial deformation limiting of the vulcanizing body are achieved, and the mounting area is increased to improve the pretightening force of the bolt.

Furthermore, the split outer tile cover and the self-lubricating sleeve are provided with openings, and the split outer tile cover and the self-lubricating sleeve are distributed in a 90-degree cross mode in the opening direction.

Furthermore, the inner surface of the self-lubricating sleeve is provided with a tin-copper sintered layer and a PTFE coating, and the self-lubricating sleeve is press-mounted on the inner sleeve in an interference fit manner.

Furthermore, the split outer tile cover is of a sub-opening matching structure, when the outer tile covers of the two split trapezoid sub-openings are combined to form a Z-shaped interface gap of the two side surfaces, the gap is filled by rubber vulcanization, and the compression amount and the matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

Furthermore, the inner sleeve is subjected to surface carbonitriding and hardening treatment.

EXAMPLE III

The principle of the third embodiment is the same as that of the first embodiment, but the combination structure is slightly different, and as can be seen from the attached figure 8, the invention relates to a plate spring bushing, which comprises a framework and a vulcanized body, wherein the framework is formed by assembling two baffle rings and an inner sleeve; the vulcanized body is press-mounted on the inner sleeve in an interference fit manner and is positioned between the two retaining rings; the vulcanized body comprises a self-lubricating sleeve, a split outer tile cover, a spacer and a rubber elastomer; the vulcanizing body is of a structure with two ends of the vulcanizing body being internally contracted, and the baffle ring is inserted into the cavity of the vulcanizing body to form matching.

The split outer tile cover is in a sub-opening matching structure, when the two split outer tile covers of the trapezoidal sub-openings are combined to form a Z-shaped interface gap of two side faces, the middle section of the split outer tile cover is obliquely arranged, the gap is filled by rubber vulcanization, and the compression amount and the matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

Through the embodiment, the invention can be seen to also relate to a method for improving the tear resistance and the torsion performance of the plate spring bushing, wherein the plate spring bushing integrated with rubber metal vulcanization is adopted, the inner surface of a rubber elastic body of a vulcanized body is compounded on a self-lubricating sleeve, and then the self-lubricating sleeve is pressed on an inner sleeve; simultaneously, dividing an outer tile cover of the vulcanized body into two split trapezoid sub-opening matched structures, arranging compression rings at two ends of the outer tile cover, and assembling the compression rings on the inner sleeve in an interference manner and inserting the compression rings into a cavity of the vulcanized body; the compression rings at two ends compress the two split trapezoidal sub-openings of the outer tile cover, so that the axial movement and radial deformation of the rubber elastic body are limited, the pre-tightening force of the lifting bolt for the installation area is increased, the self-lubricating bushing has a lubricating and wear-resistant coating to avoid rubber layer abrasion and metal friction abnormal sound, and the pre-tightening force of the lifting bolt is used for improving the anti-tearing performance of the plate spring bushing.

Furthermore, the compression of the two split trapezoidal sub-openings of the outer tile cover by the compression rings at the two ends adopts the outer tile cover with a two-piece structure, the side surface of each split is of a trapezoidal sub-opening structure, the trapezoidal side surfaces are mutually matched to form a trapezoidal joint surface when the two split outer tile covers are combined, the trapezoidal sub-openings of the two split outer tile covers are matched with the outermost layer of the plate spring bushing, a gap is reserved between the two split outer tile covers through rubber vulcanization, the axial precompression of a rubber body is realized through the compression rings when the compression rings are folded after press mounting, the axial movement and radial deformation limitation of the rubber elastomer are realized, and the pre-tightening force of the bolt is improved by increasing the mounting area.

Further, the trapezoidal side surfaces are matched with each other to form a trapezoidal combined surface when the two split trapezoidal sub-openings are combined, the side surfaces of the outer tile covers of the two split trapezoidal sub-openings are of a three-section structure in radial distribution, straight-line segments which are distributed at different angles are close to the two ends, the straight-line segments at the two ends are connected through a transition section to form a Z-shaped side surface, the side surfaces of the outer tile covers of the two split trapezoidal sub-openings are in exact opposite matching, and when the outer tile covers of the two split trapezoidal sub-openings are combined to form a Z-shaped interface gap of the two side surfaces, the Z-shaped interface gap is in exact formation.

Furthermore, the transition section is a straight line or a curve, the axial play of the plate spring bushing is reduced by adjusting the profile of the transition section or the angle between the profile of the transition section and the straight line at two ends, and the required axial and radial matching rigidity is adjusted.

Furthermore, a gap is reserved between the two split outer tile covers through rubber vulcanization, when the two split outer tile covers of the trapezoidal sub-opening are combined to form a Z-shaped interface gap of two side surfaces, the gap is filled by rubber vulcanization, and the compression amount and the matching rigidity of the rubber body can be adjusted by adjusting the width of the gap.

Furthermore, the self-lubricating bushing with the lubricating and wear-resistant coating for avoiding the rubber layer abrasion and the metal friction abnormal sound is an open-ended self-lubricating bushing, the tin-copper sintered layer and the PTFE coating are arranged on the inner surface of the self-lubricating bushing, the open-ended self-lubricating bushing with the tin-copper sintered layer and the PTFE coating is clamped on the inner bushing in an interference fit mode, and the vulcanized body is prevented from being torn through the lubricating sliding between the inner bushing and the vulcanized body when the super-torque is rotated.

Further, the determination of the over-torque value can adjust the initial sliding moment value by adjusting the thickness of the self-lubricating sleeve and the interference with the inner sleeve.

The above listed embodiments are only for clear and complete description of the technical solution of the present invention with reference to the accompanying drawings; it should be understood that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments, and the terms such as "upper", "lower", "front", "back", "middle", etc. used in this specification are for clarity of description only, and are not intended to limit the scope of the invention, which can be implemented, and the changes or modifications of the relative relationship thereof are also regarded as the scope of the invention without substantial technical changes. Meanwhile, the structures, the proportions, the sizes, and the like shown in the drawings are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes in proportion relation, or adjustments of the sizes, can still fall within the range covered by the technical contents disclosed in the present invention without affecting the effects and the achievable purposes of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention has the advantages that:

the invention adopts a plate spring bushing which is integrally vulcanized by rubber and metal, the inner surface of a rubber elastic body of a vulcanized body is compounded on a self-lubricating sleeve, and then the self-lubricating sleeve is pressed on an inner sleeve; simultaneously, dividing an outer tile cover of the vulcanized body into two split trapezoid sub-opening matched structures, arranging compression rings at two ends of the outer tile cover, and assembling the compression rings on the inner sleeve in an interference manner and inserting the compression rings into a cavity of the vulcanized body; the compression ring through both ends is to the trapezoidal rim of two split lamellas of outer tile lid compression, realizes that rubber elastomer's axial float and radial deformation are spacing, and increase installation area hoisting bolt pretightning force to there is lubrication and wear-resistant coating to avoid rubber layer wearing and tearing and metal friction abnormal sound through the self-lubricating bush, thereby hoisting bolt pretightning force promotes the anti-tear performance of leaf spring bush, has following advantage:

1. the plate spring bushing can rotate relatively under a large load when the rubber vulcanized body is used, can provide an excess torsion angle, can reach 360 degrees in a limit condition, has no influence on the rubber body, and can greatly prolong the service life of the plate spring bushing.

2. The design of the self-lubricating sleeve of the plate spring bushing increases the PTFE lubricating layer and the tin-copper wear-resistant coating, and can avoid the rubber layer abrasion and the abnormal sound caused by the mutual friction of metals under relative rotation.

3. The matching design of the sub-openings of the split outer bush covers of the plate spring bush can reduce the axial movement of the bush caused by the axial component force in the bearing process.

4. The T-shaped baffle ring structure design of the plate spring bushing can integrate axial direction, radial direction and deflection limiting, and can effectively increase the installation area of the bolt and promote friction force.

5. The opening design of the self-lubricating sleeve of the plate spring bushing can adjust the initial sliding moment value by adjusting the thickness of the self-lubricating sleeve and the interference magnitude with the inner sleeve.