CN113202854B - Assembled plastic rod end joint bearing and manufacturing method thereof - Google Patents
Assembled plastic rod end joint bearing and manufacturing method thereof Download PDFInfo
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- CN113202854B CN113202854B CN202110455085.2A CN202110455085A CN113202854B CN 113202854 B CN113202854 B CN 113202854B CN 202110455085 A CN202110455085 A CN 202110455085A CN 113202854 B CN113202854 B CN 113202854B
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- 238000007789 sealing Methods 0.000 claims abstract description 54
- 238000001746 injection moulding Methods 0.000 claims abstract description 32
- 239000002131 composite material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 24
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- 239000000463 material Substances 0.000 description 10
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- 229920001778 nylon Polymers 0.000 description 7
- 229920006351 engineering plastic Polymers 0.000 description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C43/00—Assembling bearings
- F16C43/02—Assembling sliding-contact bearings
Abstract
The invention discloses an assembled plastic rod end joint bearing, which comprises a rod end body, wherein an outer ring body is arranged on the rod end body, and an inner ring body is arranged in the outer ring body; the outer ring body comprises a first ring opening and a second ring opening along the loading direction of the inner ring body, and an assembly groove is formed in the inner side of the first ring opening; wherein, the assembly inslot lock is provided with the sealing member. The inner ring body is wrapped up by the first assembly surface between the first ring opening and the second ring opening in the axial direction, so that the inner ring body is ensured not to deviate from the ring openings at two sides of the outer ring body in the working process, the structure is stable after assembly, and the phenomenon of inner ring body clamping stagnation or over loosening can not be generated in the operation process. According to the invention, the inner ring body and the outer ring body are respectively injection molded in a separation injection molding mode, and the gap after the inner ring body is arranged in the outer ring body is controlled by the sealing piece, so that the inner ring body and the outer ring body can be bonded without gaps and smoothly rotate, and the running smoothness of the plastic rod end joint bearing is remarkably improved.
Description
Technical Field
The invention relates to the technical field of joint bearings, in particular to an assembled plastic rod end joint bearing and a manufacturing method thereof.
Background
The knuckle bearing is a spherical sliding bearing, the sliding contact surfaces of which are an inner spherical surface and an outer spherical surface, and the knuckle bearing can rotate and swing at any angle during movement.
The knuckle bearing mainly comprises an inner ring body with an outer spherical surface and an outer ring body with an inner spherical surface. The knuckle bearing is generally used for swinging motion (i.e. angular motion) with lower speed, and because the sliding surface is spherical, the knuckle bearing can also perform tilting motion (i.e. aligning motion) within a certain angle range, and still can normally work when the supporting shaft and the shaft housing hole have larger concentricity.
The conventional knuckle bearing is made of a metal material, and an inner ball is fixed in a housing by using thermal or cold deformation of the housing of the metal material. The metal joint bearing has the problems of low processing precision, heavy weight, large deformation, easy corrosion, short service life and the like, is limited by the use environment in the fields of food, medicine, chemical industry and the like, and cannot meet the user requirements. The engineering plastic has the advantages of light weight, low manufacturing cost, good wear resistance and the like, and many designers try to use the advantages of the engineering plastic to manufacture the joint bearing, and the engineering plastic is thermoplastic material, so that the engineering plastic joint bearing shell material, the engineering plastic joint bearing inner ball material and the forming method thereof can not be deformed after the shell is formed, and the patent 200810150773.2 discloses the manufacturing method which is to firstly inject the inner ball, then put the inner ball into a shell mould as an insert to inject the shell, and put the engineering plastic joint bearing after injection molding into an oven for a plurality of times of post-treatment of heating, heat preservation and cooling, so that the inner ball can rotate in the shell. The method can make the inner ball rotate in the shell, but has complex process, low production efficiency and high manufacturing cost, and because of the large plasticity of the plastic, the inner ball is possibly stuck or too loose due to different components of the plastic and different heating or cooling temperatures and speeds in the processing process, and the processing precision and quality are difficult to ensure.
Disclosure of Invention
Aiming at the problems that in the prior art, the plastic rod end joint bearing is limited by material characteristics and manufacturing methods, and the clamping stagnation or the excessive loosening of an inner ring body is difficult to avoid in practical application, the invention provides the assembled plastic rod end joint bearing and the manufacturing method thereof, the traditional processing mode of embedded injection molding of an inner ball and an outer ball is abandoned, the inner ring body and the outer ring body are respectively injection molded in a separated injection molding mode, and a sealing piece is utilized to control a gap after the inner ring body is arranged in the outer ring body, so that the inner ring body and the outer ring body can be attached without gaps and smoothly rotate, and the running smoothness of the plastic rod end joint bearing is remarkably improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the assembled plastic rod end joint bearing comprises a rod end body, wherein an outer ring body is arranged on the rod end body, and an inner ring body is arranged in the outer ring body; the outer ring body comprises a first ring opening and a second ring opening along the loading direction of the inner ring body, and an assembly groove is formed in the inner side of the first ring opening; wherein, the assembly inslot lock is provided with the sealing member. The assembly groove is used for enabling the inner ring body to be smoothly arranged in the outer ring body, after the inner ring body is arranged in the assembly groove, the sealing piece is buckled and connected with the assembly groove, the sealing piece can seal the first ring opening, sundries such as dust are prevented from entering between the outer ring body and the inner ring body, meanwhile, the inner ring body is limited at the front-back position in the outer ring body, gaps between the inner ring body and the outer ring body are eliminated, the inner ring body and the outer ring body are guaranteed to be always attached, and the problem that stress concentration and the like affect the service life of the joint bearing of the plastic rod end is avoided.
Preferably, a first assembling cambered surface is arranged between the first ring opening and the second ring opening of the outer ring body, and the inner ring body is attached to the first assembling cambered surface. The axial height of the inner ring body is smaller than the radial length, so that after the inner ring body is transversely arranged in the outer ring body, the inner ring body can be guaranteed to be wrapped and limited by a first assembling surface between a first ring opening and a second ring opening in the axial direction, the inner ring body is guaranteed not to deviate from the ring openings at two sides of the outer ring body in the working process, the structure is stable after assembling, and the phenomenon of inner ring body clamping stagnation or excessive loosening cannot be generated in the operation process.
Preferably, the assembly groove is arranged on the first assembly cambered surface, a clamping inner groove is arranged on the assembly groove, a clamping strip is arranged on the outer edge of the sealing piece, and the clamping strip is in buckled connection with the clamping inner groove. After the clamping strip is buckled with the clamping inner groove, the sealing element can be firmly installed on the first ring opening, so that the dustproof effect is achieved, meanwhile, the sealing element is matched with the first assembly cambered surface to jointly limit the inner ring body in a wrapping mode, and the inner ring body is guaranteed to move stably in the outer ring body.
Preferably, the assembly groove is a composite groove and comprises a basic groove, the clamping inner groove is arranged on the basic groove, and the depth of the clamping inner groove is larger than that of the basic groove. The clamping inner groove is used for limiting the clamping strip, so that the sealing element is fixed on the assembly groove and cannot generate relative displacement, and the sealing element can be prevented from being separated from the outer ring body while the sealing element does not interfere with rotation of the inner ring body.
Preferably, the inner edge of the sealing element is provided with a second assembling cambered surface, and the radius of the second assembling cambered surface corresponds to the radius of the radian of the first assembling cambered surface. After the sealing element is arranged in the assembly groove, the second assembly cambered surface is connected with the first assembly cambered surface, the first assembly cambered surface and the second assembly cambered surface form a wrapping surface for the inner ring body together, the inner ring body and the outer ring body are guaranteed to be attached, the defect that the surface roughness of a plastic material is higher than that of a metal material can be overcome under the connection state, and the rod end joint bearing with stable and smooth operation process is obtained.
Preferably, the outer ring body and the inner ring body are arranged concentrically. The characteristics that the inner ring body and the outer ring body are concentrically arranged are utilized, a good structural foundation is provided for the stable operation of the rod end joint bearing, and the problem that the joint surface of the outer ring body and the inner ring body is subjected to stress concentration and rapidly worn due to the fact that the joint surface of the outer ring body and the joint surface of the inner ring body are not concentric is avoided, so that the operation stability and the service life of the joint bearing are reduced. The concentrically arranged rod end knuckle bearing is capable of maintaining stable operation and silence.
Preferably, the outer ring body and the inner ring body are injection molding pieces. In the running process of the plastic rod end joint bearing, sliding friction between the inner ring body and the outer ring body has the characteristic of self lubrication. The outer ring body and the inner ring body are both formed by injection molding by adopting reinforced nylon as a raw material, the main chemical component of the self-lubricating layer is polyamide, the wear resistance is excellent, meanwhile, the groups have better rigidity and flexibility by virtue of a plurality of repeated amide groups contained in a polyamide main chain, and the aggregation state of the groups can form a smooth surface structure, so that the surface friction coefficient of the material is very low, and the material has very good self-lubricating property. Meanwhile, glass fiber, toughening agent and other blending materials are additionally added into the reinforced nylon, so that mechanical properties such as stretching, bending strength and toughness of the self-lubricating layer can be effectively improved, and stable lubricating effect can be ensured to be provided by the self-lubricating layer in the running of the rod end joint bearing.
Preferably, the first ring opening is further provided with a locking opening, and the inner ring body is attached to the side edge of the locking opening, which is close to the second ring opening. In the working process of the rod end joint bearing, when the inner ring body receives outward stretching force and has a trend of outward action, the locking port part on the first ring port can avoid the generation of forward release action of the inner ring body and the self-lubricating layer. The wrapping surface formed by the first assembling cambered surface and the second assembling cambered surface is matched with the locking notch part to limit the inner ring body in the outer ring body. After the inner ring body is arranged in the outer ring body, the front part of the inner ring body is attached to the side edge of the lock opening part close to the second ring opening at the position where the axes of the inner ring body and the outer ring body are coincident, namely, the inner side edge of the lock opening part is attached to the inner side edge of the lock opening part.
Preferably, the first assembly cambered surface is provided with a stable cambered surface corresponding to the position of the locking opening, the stable cambered surface is an inner concave surface, and the inner ring body is attached to the stable cambered surface. The stable cambered surface is used for assisting the inner ring body to keep stable in the running process of the rod end joint bearing, and the condition that the position of the first assembly cambered surface corresponding to the locking part is in point contact or line contact with the inner ring body due to machining errors is avoided, so that the integral running effect of the rod end joint bearing is affected.
Preferably, the assembly grooves are arranged in a central symmetry manner with the central axis of the outer ring body as the axis. The assembly grooves are arranged on a first ring opening of the outer ring body in a central symmetry structure, the area of the first ring opening, where the assembly grooves are not arranged, is a locking opening part, the number of the assembly grooves is even, the structure is an outer arc groove, and the inner ring body can be ensured to be smoothly arranged in the outer ring body.
Preferably, the rod end body comprises but is not limited to three structures, namely an external thread structure is arranged on the outer surface of one end of the rod end body far away from the outer ring body, the rod end body is of a screw rod structure, and the rod end body is used for connecting screw holes of various mechanical equipment; the end, far away from the outer ring body, of the rod is of a hollow structure, an inner thread structure is arranged on the inner wall of the hollow structure, and the rod end body is used for being directly connected with screws of various mechanical equipment; the end of the third rod end body, which is far away from the outer ring body, is of a hollow structure, the outer surface of the hollow structure is provided with external threads, the inner wall of the hollow structure is provided with internal threads, and the rod end body is used for compound connection. The rod end bodies of the different structures can effectively improve the universality of the assembled plastic rod end joint bearing disclosed in the application.
The invention also discloses a manufacturing method of the assembled plastic rod end joint bearing, which comprises the following steps:
s1: injection molding the inner ring body;
s2: injection molding the rod end body;
s3: injection molding the sealing piece;
s4: the inner ring body is arranged in the outer ring body from the first ring opening;
s5: and adjusting the angle of the inner ring body to the position where the inner ring body and the outer ring body are concentric, loading the sealing element into the assembly groove from the first ring opening, buckling the clamping inner groove on the outer ring body by the clamping strip on the sealing element, and attaching the inner ring body by the second assembly cambered surface 41 of the inner edge of the sealing element, so that the assembly of the assembled plastic rod end joint bearing is completed.
In the method, the inner ring body, the outer ring body and the sealing piece are respectively subjected to mold opening injection molding, and the injection molding requirements comprise: 1. the inner ring body and the outer ring body are concentric; 2. the first assembly cambered surface on the outer ring body corresponds to the second assembly cambered surface 41 on the sealing member; the two influencing hardness standards are used for ensuring smooth operation of the inner ring body after assembly forming. After injection molding of the three components, the inner ring body can be smoothly installed in the outer ring body by an assembly groove, and after the assembly groove is installed, the sealing element is buckled on the first ring opening, so that the rod end joint bearing made of plastic and running smoothly is obtained. When in actual use, the movable rod can be smoothly operated only by connecting the movable rod with the ring opening in the middle of the inner ring body.
The beneficial effects of the invention are as follows: (1) The traditional backward processing mode of embedding and injection molding of the inner ball and the outer ball is abandoned, the inner ring body and the outer ring body are respectively injection molded in a separation injection molding mode, and the gap after the inner ring body is arranged in the outer ring body is controlled by utilizing the sealing piece, so that the inner ring body and the outer ring body can be jointed without gaps and smoothly rotate, and the running smoothness of the plastic rod end joint bearing is remarkably improved; (2) The inner ring body is wrapped and limited by a first assembly surface between the first ring opening and the second ring opening in the axial direction, so that the inner ring body is ensured not to deviate from the ring openings at two sides of the outer ring body in the working process, the structure is stable after assembly, and the phenomenon of clamping stagnation or over loosening of the inner ring body is avoided in the running process; (3) The sliding friction between the inner ring body and the outer ring body formed by reinforced nylon injection molding has the characteristic of self lubrication; (4) The stable cambered surface is used for assisting the inner ring body to keep stable in the running process of the rod end joint bearing, and the position, corresponding to the locking part, of the first assembly cambered surface is prevented from forming point contact or line contact with the inner ring body due to machining errors, so that the integral running effect of the rod end joint bearing is influenced; (5) After the inner ring body is arranged in the outer ring body, the front part of the inner ring body is attached to the side edge of the lock opening part close to the second ring opening at the position where the axes of the inner ring body and the outer ring body are coincident, namely, the inner side edge of the lock opening part is attached to the inner side edge of the lock opening part.
Drawings
FIG. 1 is an exploded view of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;
in the figure: 1. the rod comprises a rod end body, 2, an outer ring body, 21, a first ring opening, 22, a second ring opening, 3, an inner ring body, 4, a sealing piece, 41, a second assembly cambered surface, 42, a clamping strip, 5, an assembly groove, 51, a basic groove, 52, a clamping inner groove, 6, a first assembly cambered surface, 61, a stable cambered surface, 7 and a locking opening.
Description of the embodiments
The invention is further described below with reference to the drawings and specific embodiments.
Example 1:
as shown in fig. 1 and 2, the assembled plastic rod end joint bearing comprises a rod end body 1, wherein an outer ring body 2 is arranged on the rod end body 1, and an inner ring body 3 is arranged in the outer ring body 2; the outer ring body 2 comprises a first ring opening 21 and a second ring opening 22 along the loading direction of the inner ring body 3, and an assembly groove 5 is formed in the inner side of the first ring opening 21; wherein, the assembly groove 5 is internally buckled and provided with a sealing element 4. The assembly groove 5 is used for smoothly loading the inner ring body 3 into the outer ring body 2, after the inner ring body 3 is loaded, the sealing piece 4 is buckled and connected with the assembly groove 5, the sealing piece 4 can seal the first ring opening 21, sundries such as dust can be prevented from entering between the outer ring body 2 and the inner ring body 3, meanwhile, the front and back positions of the inner ring body 3 in the outer ring body 2 are limited, gaps between the inner ring body 3 and the outer ring body 2 are eliminated, the inner ring body 3 and the outer ring body 2 are always attached, and the problem that stress concentration and the like influences the service life of the plastic rod end joint bearing is avoided. Particularly, the outer ring body 2 and the inner ring body 3 are concentrically arranged, and the characteristics that the inner ring body 3 and the outer ring body 2 are concentrically arranged are utilized to provide a good structural foundation for the stable operation of the rod end joint bearing, so that the problem that the joint bearing is stable in operation and long in service life due to the fact that stress concentration is rapidly worn in a certain area of a joint surface of the outer ring body 2 and the inner ring body 3 due to the fact that the outer ring body 2 and the inner ring body 3 are not concentric is avoided. The concentrically arranged rod end knuckle bearing is capable of maintaining stable operation and silence.
The outer ring body 2 and the inner ring body 3 are injection molding pieces. In the running process of the plastic rod end joint bearing, sliding friction between the inner ring body 3 and the outer ring body 2 has the characteristic of self lubrication. The outer ring body 2 and the inner ring body 3 are both formed by injection molding by adopting reinforced nylon as raw materials, the main chemical component of the self-lubricating layer is polyamide, the wear resistance is excellent, meanwhile, by virtue of a plurality of repeated amide groups contained in a polyamide main chain, the groups have better rigidity and flexibility, and the aggregation state of the groups can form a smooth surface structure, so that the surface friction coefficient of the material is very low, and the self-lubricating property is very good. Meanwhile, glass fiber, toughening agent and other blending materials are additionally added into the reinforced nylon, so that mechanical properties such as stretching, bending strength and toughness of the self-lubricating layer can be effectively improved, and stable lubricating effect can be ensured to be provided by the self-lubricating layer in the running of the rod end joint bearing.
In this embodiment, the rod end body 1 and the outer ring body 2 are of an integral structure, and the processing raw materials of the rod end body 1 and the inner ring body 3 disclosed by the invention include, but are not limited to, the following reinforced nylon, POM, PTFE, PA and other plastic materials, and the surface roughness is low due to the crystals with internal crystallization, so that the self-lubricating property is shown. The components of the reinforced nylon comprise, but are not limited to, polyamide, glass fiber and asbestos fiber, and are used for improving the wear resistance, the dimensional stability, the aging resistance and the like of the rod end joint bearing. The rod end joint bearing with the dimensional stability being particularly important in the application, dimensional change data in the injection molding process of the inner ring body 3, the outer ring body 2 and the sealing piece 4 are obtained through multiple tests, and concentricity of the inner ring body 3 and the outer ring body 2 can be improved to the greatest extent by utilizing the test data when a finished product is processed, so that running smoothness of the assembled plastic rod end joint bearing is improved. Under the condition of meeting the requirements of basic mechanical properties and surface treatment, other chemical components can be added according to the requirements to process and manufacture the rod end joint bearing.
As shown in fig. 3 and 4, a first assembling cambered surface is arranged between the first ring opening 21 and the second ring opening 22 of the outer ring body 2, and the inner ring body 3 is attached to the first assembling cambered surface 6. The inner edge of the sealing element 4 is provided with a second assembling cambered surface 41, and the radius of the second assembling cambered surface 41 corresponds to the radian radius of the first assembling cambered surface. The axial height of the inner ring body 3 is smaller than the radial length, so that after the inner ring body 3 is transversely arranged in the outer ring body 2, the inner ring body 3 can be guaranteed to be wrapped and limited by a first assembling surface between the first ring opening 21 and the second ring opening 22 in the axial direction, the inner ring body 3 is guaranteed not to deviate from the ring openings on two sides of the outer ring body 2 in the working process, the structure is stable after assembling, and the phenomenon of clamping stagnation or excessive loosening of the inner ring body 3 can not be generated in the operation process. After the sealing element 4 is installed in the assembly groove 5, the second assembly cambered surface 41 is jointed with the first assembly cambered surface, the first assembly cambered surface and the second assembly cambered surface form a wrapping surface for the inner ring body 3 together, the inner ring body 3 and the outer ring body 2 are guaranteed to be attached, the defect that the surface roughness of a plastic material is higher than that of a metal material can be overcome under the connection state, and the rod end joint bearing with stable and smooth operation process is obtained.
The assembly groove 5 is arranged on the first assembly cambered surface, the assembly groove 5 is provided with a clamping inner groove, the outer edge of the sealing piece 4 is provided with a clamping strip 42, and the clamping strip 42 is in buckled connection with the clamping inner groove 52. The assembly groove 55 is a composite groove and comprises a basic groove 51, the clamping inner groove is arranged on the basic groove, and the depth of the clamping inner groove is larger than that of the basic groove. In this embodiment, the base groove is a straight groove in the axial direction, the engaging inner groove is a wedge groove, and the engaging strip 42 is injection molded into a wedge shape corresponding to the engaging inner groove structure. The connecting surface of the wedge-shaped structure is an inclined surface, and the sealing element 4 and the assembly groove 5 can be firmly and stably connected by utilizing the self-locking characteristic of the inclined surface. After the clamping strip 42 and the clamping inner groove are buckled, the sealing piece 4 can be firmly installed on the first ring opening 21 to play a dustproof role, and meanwhile, the sealing piece 4 is matched with the first assembly cambered surface to jointly limit the inner ring body 3 in a wrapping mode, so that the inner ring body 3 is ensured to stably move in the outer ring body 2. The clamping inner groove is used for limiting the clamping strip 42, so that the sealing element 4 is fixed on the assembly groove 5 and cannot generate relative displacement, and the sealing element 4 can be prevented from being separated from the outer ring body 2 while the sealing element 4 does not interfere with the rotation of the inner ring body 3.
The first ring opening 21 is also provided with a locking opening 7, and the inner ring body 3 is attached to the side edge of the locking opening 7, which is close to the second ring opening 22. The position of the first assembly cambered surface corresponding to the locking part 7 is provided with a stable cambered surface 61, the stable cambered surface 61 is an inner concave surface, and the inner ring body 3 is attached to the stable cambered surface 61.
In the working process of the rod end joint bearing, the locking port part 7 on the first ring port 21 can avoid the generation of forward release action of the inner ring body 3 and the self-lubricating layer whenever the inner ring body 3 receives outward stretching force and has a trend of outward action. The inner ring body 3 is limited in the outer ring body 2 by the wrapping surface formed by the first assembly cambered surface and the second assembly cambered surface 41 in cooperation with the locking part 7. After the inner ring body 3 is arranged in the outer ring body 2, the front part of the inner ring body 3 is attached to the side edge of the locking part 7 close to the second ring opening 22, namely the inner side edge of the locking part 7, at the position where the axis of the inner ring body 3 and the axis of the outer ring body 2 are coincident, and the design effectively reduces the front-back gap between the inner ring body 3 and the outer ring body 2, so that the assembly compactness of the inner ring body 3 and the outer ring body 2 is improved. The stable cambered surface 61 is used for assisting the inner ring body 3 to keep stable in the running process of the rod end joint bearing, and avoids the position of the first assembly cambered surface corresponding to the locking part 7 from forming point contact or line contact with the inner ring body 3 due to machining errors, so that the integral running effect of the rod end joint bearing is affected.
The assembly grooves 5 are arranged in a central symmetry manner by taking the central axis of the outer ring body 2 as the axis. The assembly grooves 5 are arranged on the first ring opening 21 of the outer ring body 2 in a central symmetry structure, the area of the first ring opening 21, where the assembly grooves 5 are not arranged, is a locking opening part 7, the number of the assembly grooves 5 is even, the structure is an outer arc groove, and the inner ring body 3 can be ensured to be smoothly arranged in the outer ring body 2.
The rod end body 1 includes, but is not limited to, three structures, one of which is; the end, far away from the outer ring body 2, of the rod end body 1 is of a hollow structure, an inner thread structure is arranged on the inner wall of the hollow structure, and the rod end body 1 is used for being directly connected with screws of various mechanical equipment; the end of the third rod end body 1 far away from the outer ring body 2 is of a hollow structure, the outer surface of the hollow structure is provided with external threads, the inner wall of the hollow structure is provided with internal threads, and the rod end body 1 is used for compound connection. The rod end body 1 with the different structures can effectively improve the universality of the assembled plastic rod end joint bearing disclosed in the application. In this embodiment, rod end body 1 is hollow structure, and its hollow structure inner wall is provided with the internal thread for connect the screw rod of all kinds of equipment, it is convenient to assemble.
The invention also discloses a manufacturing method of the assembled plastic rod end joint bearing, which comprises the following steps:
s1: injection molding the inner ring body 3;
s2: injection molding the rod end body 1;
s3: injection molding the sealing member 4;
s4: the inner ring body 3 is arranged in the outer ring body 2 from the first ring opening 21;
s5: and adjusting the angle of the inner ring body 3 to the position where the inner ring body 3 and the outer ring body 2 are concentric, loading the sealing element 4 into the assembly groove 5 from the first ring opening 21, buckling the buckling inner groove on the outer ring body 2 by the buckling strip 42 on the sealing element 4, and attaching the second assembly cambered surface 41 on the inner edge of the sealing element 4 to the inner ring body 3 to complete the assembly of the assembled plastic rod end joint bearing.
In the method, the inner ring body 3, the outer ring body 2 and the sealing piece 4 are respectively subjected to mold opening injection molding, and the injection molding requirements comprise: 1. the inner ring body 3 is concentric with the outer ring body 2; 2. the first assembling cambered surface on the outer ring body 2 corresponds to the second assembling cambered surface 41 on the sealing element 4; the two influencing hardness standards are used for ensuring smooth operation of the inner ring body 3 after assembly forming. After injection molding of the three components, the inner ring body 3 can be smoothly installed in the outer ring body 2 by the assembly groove 5, and after the assembly, the sealing element 4 is buckled on the first ring opening 21, so that the plastic rod end joint bearing with stable structure and smooth operation is obtained. When in actual use, the movable rod can be smoothly operated only by connecting the movable rod with the ring opening in the middle of the inner ring body 3.
The manufacturing method of the rod end knuckle bearing in this embodiment is as follows: firstly, injection molding an inner ring body 3, wherein a ring opening for connecting a movable rod is formed in the middle of the inner ring body 3, and the radian of the outer surface of the inner ring body 3 meets the design size requirement after cooling and stabilization under the support of test data; then the outer ring body 2 is injection molded, so that the radius of the first assembling cambered surface of the outer ring body 2 is ensured to be matched with the radius of the inner ring body 3; in the present embodiment, the assembly groove 5 has a two-half arc structure separately disposed in the left-right direction of the first ring opening 21; finally, the sealing element 4 is injection molded, so that the second assembling cambered surface 41 of the sealing element 4 corresponds to the second assembling cambered surface 41 of the outer ring body 2. The injection molded inner ring body 3 and outer ring body 2 have uniform density, complete structure and smooth and flawless inner and outer surfaces.
After the injection molding is completed, the inner ring body 33 is installed in the outer ring body 22 vertically installed in a posture in which the central axis is vertical, and since the diameter of the inner ring body 33 is slightly smaller than the distance between the left and right fitting grooves 5, the inner ring body 33 can be smoothly installed in the outer ring body 22, and after the installation, the inner ring body 33 is rotated so that the central axis thereof rotates by 90 ° and coincides with the central axis of the outer ring body 22, at this time, the inner ring body 33 and the outer ring body 22 remain in a concentric state, and the inner ring body 33 cannot be removed from the first ring port 2121 under the restriction of the lock port 7. The locking part 7 is matched with the first assembling cambered surface to ensure the anti-interference performance of the assembling structure. After the inner ring body 33 is installed, the sealing element 4 is pressed into the assembly groove 5 on the first ring opening 21, so that the clamping strip 42 is completely buckled with the clamping inner groove, and the whole plastic rod end joint bearing is manufactured. When the plastic rod end joint formed by injection molding and assembled is operated, the self-lubricating rod end joint has the characteristics of self-lubrication, good running smoothness and stability, light weight, low cost and the like, and can be applied to the fields of medicines, foods and the like.
It should be noted that the assembly groove 5 may be disposed as a plurality of through grooves uniformly formed around the first ring opening 2121 for simultaneously performing injection molding to obtain the self-lubricating layer 4 with uniform density and complete structure.
Example 2
Unlike embodiment 1, in this embodiment, the outer surface of the end body 1 far away from the outer ring body 2 is provided with an external thread structure, the end body 1 is a screw structure, and the end body 1 is used for connecting screw holes of various mechanical devices.
The rod end body 1 in the embodiment 1 is a female rod end body 1, and the diversity of the male rod end body 1 in the embodiment 2 can ensure that the rod end joint bearing can adapt to the requirements of various mechanical equipment, and the adaptability and the universality of the rod end joint bearing are effectively improved.
In addition to the above embodiments, the technical features of the present invention may be rearranged and combined within the scope of the claims and the disclosure of the present invention to form new embodiments, which may be realized by those skilled in the art without inventive effort, and thus, embodiments of the present invention not described in detail should be considered as embodiments of the present invention within the scope of the protection of the present invention.
Claims (7)
1. A fabricated plastic rod end joint bearing, comprising:
the rod end body is provided with an outer ring body, and an inner ring body is arranged in the outer ring body;
the outer ring body comprises a first ring opening and a second ring opening along the loading direction of the inner ring body, and an assembly groove is formed in the inner side of the first ring opening;
wherein, a sealing element is buckled in the assembly groove;
a first assembly cambered surface is arranged between the first ring opening and the second ring opening of the outer ring body; the inner edge of the sealing piece is provided with a second assembly cambered surface, and the radius of the second assembly cambered surface corresponds to the radius of the radian of the first assembly cambered surface;
after the sealing element is installed in the assembly groove, the second assembly cambered surface is jointed with the first assembly cambered surface to form a wrapping surface for the inner ring body together;
the axial height of the inner ring body is smaller than the radial length, and the inner ring body is attached to the first assembling cambered surface;
the rod end body and the outer ring body are of an integrated structure, and the outer ring body and the inner ring body are injection molding pieces.
2. The assembled plastic rod end joint bearing according to claim 1, wherein the assembling groove is arranged on the first assembling cambered surface, and the assembling groove is arranged in a central symmetry manner by taking the central axis of the outer ring body as the axis; the assembly groove is provided with a clamping inner groove, the outer edge of the sealing piece is provided with a clamping strip, and the clamping strip is buckled and connected with the clamping inner groove.
3. The fabricated plastic rod end joint bearing according to claim 2, wherein the assembly groove is a composite groove comprising a base groove, the snap fit inner groove is disposed on the base groove, and the snap fit inner groove has a depth greater than the base groove.
4. The fabricated plastic rod end joint bearing of claim 1, wherein the outer race body is concentric with the inner race body.
5. The fabricated plastic rod end joint bearing according to claim 1, wherein the first collar is further provided with a locking portion, and the inner collar engages the locking portion adjacent a side edge of the second collar.
6. The assembled plastic rod end joint bearing according to claim 5, wherein a stable cambered surface is arranged at a position of the first assembling cambered surface corresponding to the locking opening part, the stable cambered surface is an inner concave surface, and the inner ring body is adhered to the stable cambered surface.
7. A method of manufacturing a fabricated plastic rod end joint bearing according to any one of claims 1-6, comprising the steps of:
s1: injection molding the inner ring body;
s2: injection molding the rod end body;
s3: injection molding the sealing piece;
s4: the inner ring body is arranged in the outer ring body from the first ring opening;
s5: the inner ring body is arranged in the outer ring body which is vertically arranged in a central axis vertical posture, the angle of the inner ring body is adjusted to the concentric position of the inner ring body and the outer ring body, the sealing element is arranged in the assembly groove from the first ring opening, the clamping strip on the sealing element is buckled with the clamping inner groove on the outer ring body, the second assembly cambered surface of the inner edge of the sealing element is attached to the inner ring body, and the assembly of the joint bearing of the assembled plastic rod end is completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110455085.2A CN113202854B (en) | 2021-04-26 | 2021-04-26 | Assembled plastic rod end joint bearing and manufacturing method thereof |
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| CN202110455085.2A CN113202854B (en) | 2021-04-26 | 2021-04-26 | Assembled plastic rod end joint bearing and manufacturing method thereof |
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| CN113202854A (en) | 2021-08-03 |
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Address after: 323000 No.12, Pinggu 1st Road, Shuige Industrial Zone, Liandu District, Lishui City, Zhejiang Province Applicant after: Odeke intelligent steering system (Zhejiang) Co.,Ltd. Address before: 323000 No.12, Pinggu 1st Road, Shuige Industrial Zone, Liandu District, Lishui City, Zhejiang Province Applicant before: LISHUI CITY RUIXING BEARINGS Co.,Ltd. |
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