CN113915204A - Fork lug assembly and assembly method thereof - Google Patents

Fork lug assembly and assembly method thereof Download PDF

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Publication number
CN113915204A
CN113915204A CN202010666388.4A CN202010666388A CN113915204A CN 113915204 A CN113915204 A CN 113915204A CN 202010666388 A CN202010666388 A CN 202010666388A CN 113915204 A CN113915204 A CN 113915204A
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CN
China
Prior art keywords
bush
hole
shoulder
fork
lug
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Pending
Application number
CN202010666388.4A
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Chinese (zh)
Inventor
王宝龙
熊曦耀
李智勇
沈国喜
俞应炜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Changhe Aviation Industries Co Ltd
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Jiangxi Changhe Aviation Industries Co Ltd
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Publication date
Application filed by Jiangxi Changhe Aviation Industries Co Ltd filed Critical Jiangxi Changhe Aviation Industries Co Ltd
Priority to CN202010666388.4A priority Critical patent/CN113915204A/en
Publication of CN113915204A publication Critical patent/CN113915204A/en
Pending legal-status Critical Current

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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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/0241—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread with the possibility for the connection to absorb deformation, e.g. thermal or vibrational
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/025—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread specially designed to compensate for misalignement or to eliminate unwanted play

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

The invention relates to a fork lug assembly and an assembly method thereof. The fork lug assembly comprises a fork lug, a shoulder bush, a connected piece, a bush, a bolt and a nut; the fork lug is provided with two lug plates which are arranged in parallel relatively, and the two lug plates are respectively provided with a coaxial through hole; the shoulder bush is assembled with one of the shoulder bush in an interference fit manner, the bush is assembled with the other through hole in a clearance fit manner, the connected piece is clamped between the shoulder bush and the bush, the bolt sequentially penetrates through the shoulder bush, the connected piece and the center of the bush, and the free end of the bolt is screwed and fixed with the nut in a threaded fit manner; when the convex shoulder bush, the connected piece and the bush are assembled in sequence and are in a free state, sinking exists between the convex shoulder bush and the outer end face of the through hole, the bush is higher than the outer end face of the through hole, and when the nut is screwed, pre-tightening force is generated and does not directly act on the fork lug, so that the fork lug is prevented from being subjected to torque and abrasion; meanwhile, assembly clearance is avoided, and the fatigue life is prolonged.

Description

Fork lug assembly and assembly method thereof
Technical Field
The invention belongs to the technical field of mechanical design, and particularly relates to a fork lug assembly and an assembly method thereof.
Background
The fork lug structure exists in common machinery and aircraft, rod end bearings of a stay rod, a swinging rod and a damping rod are connected with the fork lug through bolts, and the common fork lug assembly has the following defects:
1) as shown in fig. 1, the pretightening force of the bolt directly acts on the fork lug, so that the fork lug is subjected to the action of torque, the outer side of the fork lug is subjected to the action of tensile stress, and the inner side of the fork lug is subjected to the action of compressive stress; 2) as shown in fig. 2, the pretightening force of the bolt directly acts on the fork lug to enable the fork lug to be retracted to generate form and position change, so that the coaxiality and the straightness of a through hole of the fork lug are directly reduced, the eccentric wear phenomenon of the through hole is caused, and the abrasion of the hole and the bolt is accelerated; interference between the bolt and the fork lug through hole can be caused, so that assembly stress is generated, and a more serious damage effect is generated; 3) in addition, as shown in fig. 1, in a free state of an ordinary fork lug without screwing a bolt, a gap C exists between the bushing and the connected piece, and when the bolt is screwed and the axial assembling force is large enough, the gap C can be eliminated, but if the fork lug is deformed, as shown in fig. 2, local contact can occur between the bushing and the connected piece to generate a wedge-shaped gap, so that the connected piece is subjected to looseness and eccentric wear; when the axial assembling force is small, the clearance C cannot be eliminated, and the problem of free rattling is also generated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a fork lug assembly, which thoroughly overcomes the defects of the common fork lug assembly.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a fork lug assembly comprising a fork lug (1), a shoulder bushing (2), a connected member (3), a bushing (4), a bolt (5), and a nut (6), wherein:
the fork ear (1) is provided with a lug plate 1(11) and a lug plate 2(12) which are arranged in parallel, a through hole (111) is arranged on the lug plate 1(11), a through hole (121) is arranged on the lug plate 2(12), and the through hole (111) is coaxial with the through hole (121);
the centers of the shoulder bush (2), the connected piece (3) and the bush (4) are all provided with through holes;
the shoulder bush (2) is assembled with the through hole (111) in an interference fit mode, the interference is not suitable for being designed to be too large, the interference range does not exceed 0.1mm, one side of the shoulder bush (2) is provided with a shoulder part (21), the shoulder part (21) is lapped on the inner surface of the lug plate 1(11), the bush (4) is assembled with the through hole (121) in a clearance fit mode, and the connected piece (3) is clamped between the shoulder bush (2) and the bush (4); the bolt (5) sequentially penetrates through a convex shoulder bush (2) assembled on the fork lug (1), the connected piece (3) and a through hole in the center of the bush (4), and the free end of the bolt is screwed and fixed with the nut (6) in a threaded fit manner;
the method is characterized in that: when the shoulder bush (2), the connected piece (3) and the bush (4) are sequentially assembled on the fork lug (1) and are in a free state, the end face of the shoulder bush (2) close to one side of the outer end face of the through hole (111) is lower than the outer end face of the through hole (111), and the bush (4) is higher than the outer end face of the through hole (121); when the bolt (5) and the nut (6) are further assembled in sequence and the nut (6) is screwed according to the specified screwing torque, the end face of the shoulder bush (2) close to the outer end face of the through hole (111) is flush with the outer end face of the through hole (111), the bush (4) is still higher than the outer end face of the through hole (121), and meanwhile the clearance fit between the bush (4) and the through hole (121) is changed into the tight fit.
In one possible embodiment, the bore diameters of the center through holes of the shoulder bush (2), the connected piece (3) and the bush (4) are the same.
In one possible embodiment, when the shoulder bush (2), the connected piece (3) and the bush (4) are sequentially assembled on the fork lug (1) and are in a free state, the end face of the shoulder bush (2) close to the outer end face of the through hole (111) is not more than 0.5mm lower than the outer end face of the through hole (111).
In one possible embodiment, when the shoulder bush (2), the connected piece (3) and the bush (4) are assembled on the fork lug (1) in sequence and are in a free state, the distance range B of the bush (4) higher than the outer end face of the through hole (102) is not more than 0.5 mm.
In a possible embodiment, the bushing (4) has a shoulder portion (41).
In one possible embodiment, the shoulder portion (41) is located above the inner surface of the tab 2 (12).
In one possible embodiment, the shoulder portion (41) is located above an outer end face of the tab 2 (12).
According to a second aspect of the present invention, there is provided a fork lug assembly assembling method for assembling the fork lug assembly of the first aspect of the present invention, comprising the steps of:
the first step is as follows: mounting the shoulder bushing (2) in a through hole (111) on a tab 1(11) of the fork tab (1);
the second step is that: -mounting the bushing (4) in a through hole (121) on a tab 2(12) of the fork tab (1);
the third step: clamping the connected piece (3) between the shoulder bush (2) and the bush (4) and coaxially aligning the central through hole of the connected piece (3) with the central through holes of the shoulder bush (2) and the bush (4);
the fourth step: the bolt (5) sequentially penetrates through the central through hole of the bushing (2), the connected piece (3) and the bushing (4);
the fifth step: the nut (6) is sleeved on one side of the free end of the bolt (5), and the nut (6) is screwed according to a specified screwing torque.
In the invention, when the shoulder bush (2), the connected piece (3) and the bush (4) are sequentially assembled on the fork lug (1) and are in a free state, a sinking position exists between the shoulder bush (2) and the outer end surface of the through hole (111) on the lug plate 1(11) of the fork lug (1), and the bush (4) protrudes out of the outer end surface of the through hole (121) on the lug plate 2(12) of the fork lug (1), through the matching design of the component structures, when the bolt (6) is screwed, a pretightening force is generated on the connected piece (3), and the pretightening force does not directly act on the fork lug, thereby further producing the following beneficial effects:
1. avoiding torsion of tabs 1(11) and tabs 2(12) of the fork ear (1);
2. the coaxiality of the through hole (111) and the through hole (121) on the fork lug (1) is prevented from being deteriorated due to deformation of the fork lug (1), and series problems of eccentric wear of the through hole, abrasion of a bolt, assembly stress and the like caused by the coaxiality deterioration of the through hole (111) and the through hole (121) are further prevented;
3. the shoulder bush (2) is fixed on a lug piece (11) of the fork lug (1) by the connecting piece (3) and the bush (4), so that the assembly gap and looseness are avoided;
4. the aperture of the through hole (111) is reduced under the pressure action of the pretightening force of the bolt, which is equivalent to increase the interference between the shoulder bush (2) and the through hole (111) and improve the fatigue life;
5. the outer diameter of the bushing (4) is enlarged under the pressure action of the pretightening force of the bolt, so that the bushing (4) and the side wall of the through hole (121) on the fork lug (1) generate a pressure stress action, and the effect of prolonging the fatigue life is achieved;
6. the inner diameter of the central through hole of the bushing (4) is reduced under the pressure action of the pretightening force of the bolt, so that the gap between the bushing (4) and the bolt (5) is reduced, and the effect of reducing the vibration gap is achieved;
7. the inner diameter of the central through hole of the connected piece (3) is reduced under the pressure action of the pretightening force of the bolt, so that the gap between the connected piece (3) and the bolt (5) is reduced, and the effect of reducing the vibration gap is achieved.
Drawings
FIG. 1 is a schematic structural view of a conventional fork lug assembly in a free state;
FIG. 2 is a schematic structural diagram of a conventional fork lug assembly in a pre-tensioned state;
FIG. 3 is a schematic structural view of example 1 of the present invention;
FIG. 4 is a schematic structural view of example 2 of the present invention;
FIG. 5 is a schematic structural view of example 3 of the present invention;
wherein:
1-fork ear, 11-ear 1, 111-through hole, 12-ear 2, 121-through hole; 2-shoulder bushing, 21-shoulder portion; 3-connected piece; 4-bushing, 41-shoulder portion; 5-bolt; 6-nut.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention, and the terms "first", "second", "third" are used for descriptive purposes only and are not intended to indicate or imply relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; there may be communication between the interiors of the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in fig. 3, a fork lug assembly comprises a fork lug (1), a shoulder bushing (2), a connected piece (3), a bushing (4), a bolt (5) and a nut (6), wherein:
the fork ear (1) is provided with a lug plate 1(11) and a lug plate 2(12) which are arranged in parallel, a through hole (111) is arranged on the lug plate 1(11), a through hole (121) is arranged on the lug plate 2(12), and the through hole (111) is coaxial with the through hole (121);
the centers of the shoulder bush (2), the connected piece (3) and the bush (4) are all provided with through holes;
the shoulder bush (2) is assembled with the through hole (111) in an interference fit mode, a shoulder part (21) is arranged on one side of the shoulder bush (2), the shoulder part (21) is lapped on the inner surface of the lug plate 1(11), the bush (4) is assembled with the through hole (121) in a clearance fit mode, and the connected piece (3) is clamped between the shoulder bush (2) and the bush (4); the bolt (5) sequentially penetrates through a convex shoulder bush (2) assembled on the fork lug (1), the connected piece (3) and a through hole in the center of the bush (4), and the free end of the bolt is screwed and fixed with the nut (6) in a threaded fit manner;
when the shoulder bush (2), the connected piece (3) and the bush (4) are sequentially assembled on the fork lug (1) and are in a free state, the end face of the shoulder bush (2) close to one side of the outer end face of the through hole (111) is lower than the outer end face of the through hole (111), and the bush (4) is higher than the outer end face of the through hole (121); when the bolt (5) and the nut (6) are further assembled in sequence and the nut (6) is screwed according to the specified screwing torque, the end surface of the shoulder bush (2) close to one side of the outer end surface of the through hole (111) is flush with the outer end surface of the through hole (111), the bush (4) is still higher than the outer end surface of the through hole (121), and meanwhile, the clearance fit between the bush (4) and the through hole (121) is changed into tight fit;
the diameters of the central through holes of the shoulder bush (2), the connected piece (3) and the bush (4) are the same;
the distance A that the end surface of the shoulder bush (2) close to one side of the outer end surface of the through hole (111) is lower than the outer end surface of the through hole (111) is not more than 0.1 mm; the length range of the bush (4) higher than the outer end face of the through hole (102) is not more than 0.1 mm.
Example 2:
as shown in fig. 4, embodiment 2 is further illustrated on the basis of embodiment 1, the bushing (4) has a shoulder portion (41), the shoulder portion (41) being located above an inner surface of the tab 2 (12).
Example 3:
as shown in fig. 5, embodiment 3 is based on embodiment 1, the bush (4) has a shoulder portion (41), and the shoulder portion (41) is located above the outer end face of the tab 2 (12).
As shown in fig. 3-5, the fork lug assembly of embodiments 1-3 above is assembled by the following steps:
the first step is as follows: mounting the shoulder bushing (2) in a through hole (111) on a tab 1(11) of the fork tab (1);
the second step is that: -mounting the bushing (4) in a through hole (121) on a tab 2(12) of the fork tab (1);
the third step: clamping the connected piece (3) between the shoulder bush (2) and the bush (4) and coaxially aligning the central through hole of the connected piece (3) with the central through holes of the shoulder bush (2) and the bush (4);
the fourth step: the bolt (5) sequentially penetrates through the central through hole of the bushing (2), the connected piece (3) and the bushing (4);
the fifth step: the nut (6) is sleeved on one side of the free end of the bolt (5), and the nut (6) is screwed according to a specified screwing torque.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (8)

1. A fork lug assembly comprises a fork lug (1), a shoulder bushing (2), a connected piece (3), a bushing (4), a bolt (5) and a nut (6), wherein:
the fork ear (1) is provided with a lug plate 1(11) and a lug plate 2(12) which are arranged in parallel, a through hole (111) is arranged on the lug plate 1(11), a through hole (121) is arranged on the lug plate 2(12), and the through hole (111) is coaxial with the through hole (121);
the centers of the shoulder bush (2), the connected piece (3) and the bush (4) are all provided with through holes;
the shoulder bush (2) is assembled with the through hole (111) in an interference fit mode, a shoulder part (21) is arranged on one side of the shoulder bush (2), the shoulder part (21) is lapped on the inner surface of the lug plate 1(11), the bush (4) is assembled with the through hole (121) in a clearance fit mode, and the connected piece (3) is clamped between the shoulder bush (2) and the bush (4); the bolt (5) sequentially penetrates through a convex shoulder bush (2) assembled on the fork lug (1), the connected piece (3) and a through hole in the center of the bush (4), and the free end of the bolt is screwed and fixed with the nut (6) in a threaded fit manner;
the method is characterized in that: when the shoulder bush (2), the connected piece (3) and the bush (4) are sequentially assembled on the fork lug (1) and are in a free state, the end face of the shoulder bush (2) close to one side of the outer end face of the through hole (111) is lower than the outer end face of the through hole (111), and the bush (4) is higher than the outer end face of the through hole (121); when the bolt (5) and the nut (6) are further assembled in sequence and the nut (6) is screwed according to the specified screwing torque, the end face of the shoulder bush (2) close to the outer end face of the through hole (111) is flush with the outer end face of the through hole (111), the bush (4) is still higher than the outer end face of the through hole (121), and meanwhile the clearance fit between the bush (4) and the through hole (121) is changed into the tight fit.
2. A fork lug assembly according to claim 1, wherein the bore diameters of the shoulder bush (2), the connected part (3) and the bush (4) are the same.
3. A fork lug assembly according to claim 1, wherein when the shoulder bush (2), the connected member (3) and the bush (4) are fitted to the fork lug (1) in this order in a free state, the distance A between the end surface of the shoulder bush (2) on the side close to the outer end surface of the through hole (111) and the outer end surface of the through hole (111) is not more than 0.5 mm.
4. A fork lug assembly according to claim 1, characterized in that the distance B of the bush (4) above the outer end surface of the through hole (102) does not exceed 0.5mm when the shoulder bush (2), the connected piece (3) and the bush (4) are fitted in sequence on the fork lug (1) in a free state.
5. A fork ear assembly according to any of claims 1-4, characterized in that the bushing (4) has a shoulder portion (41).
6. A fork ear assembly according to claim 5, wherein the shoulder portion (41) is located above the inner surface of the ear 2 (12).
7. A fork lug assembly according to claim 5, wherein the shoulder portion (41) is located above the outer end face of the lug 2 (12).
8. A fork lug assembly method of assembling a fork lug assembly of any one of claims 1-7, wherein: the method comprises the following steps:
the first step is as follows: mounting the shoulder bushing (2) in a through hole (111) on a tab 1(11) of the fork tab (1);
the second step is that: -mounting the bushing (4) in a through hole (121) on a tab 2(12) of the fork tab (1);
the third step: clamping the connected piece (3) between the shoulder bush (2) and the bush (4) and coaxially aligning the central through hole of the connected piece (3) with the central through holes of the shoulder bush (2) and the bush (4);
the fourth step: the bolt (5) sequentially penetrates through the central through hole of the bushing (2), the connected piece (3) and the bushing (4);
the fifth step: the nut (6) is sleeved on one side of the free end of the bolt (5), and the nut (6) is screwed according to a specified screwing torque.
CN202010666388.4A 2020-07-10 2020-07-10 Fork lug assembly and assembly method thereof Pending CN113915204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010666388.4A CN113915204A (en) 2020-07-10 2020-07-10 Fork lug assembly and assembly method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010666388.4A CN113915204A (en) 2020-07-10 2020-07-10 Fork lug assembly and assembly method thereof

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Publication Number Publication Date
CN113915204A true CN113915204A (en) 2022-01-11

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Application Number Title Priority Date Filing Date
CN202010666388.4A Pending CN113915204A (en) 2020-07-10 2020-07-10 Fork lug assembly and assembly method thereof

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2517640A1 (en) * 1975-04-22 1976-10-28 Hilma Gmbh Maschf BUSHING FOR THE BEARING OF PISTONS, SHAFTS AND AXES
CN201931430U (en) * 2010-12-27 2011-08-17 江西昌河航空工业有限公司 Pressing tool of small gap double-fork lug shoulder piece lining of helicopter
CN204775995U (en) * 2015-06-23 2015-11-18 中国航空工业集团公司西安飞机设计研究所 Elevator actuator antihunting control structure
CN206600368U (en) * 2016-11-30 2017-10-31 中国直升机设计研究所 A kind of loose bush attachment structure
CN207454475U (en) * 2017-11-03 2018-06-05 江西洪都航空工业集团有限责任公司 A kind of structural assemblies that can eliminate gap automatically

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2517640A1 (en) * 1975-04-22 1976-10-28 Hilma Gmbh Maschf BUSHING FOR THE BEARING OF PISTONS, SHAFTS AND AXES
CN201931430U (en) * 2010-12-27 2011-08-17 江西昌河航空工业有限公司 Pressing tool of small gap double-fork lug shoulder piece lining of helicopter
CN204775995U (en) * 2015-06-23 2015-11-18 中国航空工业集团公司西安飞机设计研究所 Elevator actuator antihunting control structure
CN206600368U (en) * 2016-11-30 2017-10-31 中国直升机设计研究所 A kind of loose bush attachment structure
CN207454475U (en) * 2017-11-03 2018-06-05 江西洪都航空工业集团有限责任公司 A kind of structural assemblies that can eliminate gap automatically

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
东北重型机械学院，洛阳农业机械学院: "《机床夹具设计手册》", 31 January 1980 *

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