AU2020102934A4 - Collet-structure locknut - Google Patents
Collet-structure locknut Download PDFInfo
- Publication number
- AU2020102934A4 AU2020102934A4 AU2020102934A AU2020102934A AU2020102934A4 AU 2020102934 A4 AU2020102934 A4 AU 2020102934A4 AU 2020102934 A AU2020102934 A AU 2020102934A AU 2020102934 A AU2020102934 A AU 2020102934A AU 2020102934 A4 AU2020102934 A4 AU 2020102934A4
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- Prior art keywords
- collet
- nut
- cone nut
- bolt
- workpiece
- Prior art date
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- Ceased
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- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 230000002265 prevention Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0053—Specially shaped nuts or heads of bolts or screws for rotations by a tool with a conical or prismatic recess for receiving a centering pin of the tool apparatus
-
- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
-
- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/16—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut
- F16B39/18—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut in which the locknut grips with screw-thread in the nuts as well as on the bolt
-
- 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
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
- F16B23/0046—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool having one eccentric circular or polygonal recess or protrusion
-
- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/126—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft
- F16B39/128—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft by means of eccentrical or spiral interengaging parts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The present invention relates to a collet-structure locknut, and belongs to the technical field
of threaded fasteners. The collet-structure locknut is composed of a collect cone nut and an inner
cone nut. The center of the collet cone nut is provided with a threaded hole. The bottom surface
of the collet cone nut is provided with a toothed groove. A threaded hole and an inner taper hole
are arranged in the inner cone nut. A collet cone toothed nut is installed and screwed with a bolt
or a stud, so that the toothed groove on the bottom of the collet cone nut contacts the surface of a
workpiece II. The inner cone nut is screwed onto the bolt. When the inner taper hole is screwed
with a frustum, a radial force and an axial force are generated on a cone, and the radial force
drives the collet cone nut to retract towards the center of the bolt to further clamp the surface of
the bolt so as to prevent the loosening. The axial force pushes the collet cone nut to move
towards the workpiece II; the bottom surface of the collet cone nut contacts the workpiece II to
generate axial pressure; and the toothed groove overcomes a reverse torque to further prevent the
loosening. The collet-structure locknut is simple in structure and low in manufacturing cost and
meets the application needs under the working conditions of high speed, large dynamic load,
great vibration, large temperature difference and lubrication.
Drawings of Description
LOC C
Fig. 1
LO
Fig. 2
1
Description
Drawings of Description
Fig. 1
Fig. 2
Description
Technical Field
The present invention belongs to the technical field of threaded fasteners, relates to a
locknut, and particularly to a collet-structure locknut used under the working conditions of high
speed, large dynamic load, great vibration, large temperature difference and lubrication.
Background
With the advantages of large connection force, compact structure and convenience in
disassembling, threaded connection is widely used in various mechanical structures and is one of
the most common fastening means. The threaded connection allows the force (or movement) to
be reliably transferred between connected structures. When connected parts are pressure
containers or pipelines, the threaded connection structure should also ensure that an assembly
body has good leak tightness.
A working principle of a locknut is to use the friction force between a nut and a bolt for
self-locking. At present, the first way is to tighten two nuts of the same type onto a bolt, and to
add a tightening torque between the two nuts to make the bolt connection reliable; and the other
way is for a dedicated locknut which shall be used together with an anti-loosing washer. The
dedicated locknut is not a hexagonal nut but a mid-round nut with six notches on its
circumference. The six notches are force application points of a tightening tool, and also are used
for clamping bayonets of the anti-loosing washer. The second anti-loosening way is more
reliable than the first way, but has relatively complicated structure.
The loosening of the nut connection is mainly caused by initial deformation of a threaded
connecting part, the action of an axial load and the action of a transverse load. The loosening of
the nut connection may affect the operation of machines, and even may cause accidents, so that
an effective loosening prevention measure should be adopted when in design. A common
loosening prevention method for the nut is frictional loosening prevention, mechanical loosening
Description
prevention and the loosening prevention by destroying movement relationship of thread pairs. In
the frictional loosening prevention, a pressure that does not change with the connection load
exists in the thread pair, so that three is always a friction torque preventing the relative rotation.
The pressure may be generated by longitudinal or transverse pressing of the thread pair. A
common method is to use a counter-jacking nut, a spring washer and an ordinary self-locking
nut. The mechanical loosening prevention adopts a split pin and a hexagonal slotted nut. After
the hexagonal slotted nut is tightened, the split pin is penetrated into a small hole at the tail
portion of the bolt and a slot of the nut, and the tail portion of the split pin is split to fit to the side
surface of the nut; or after the nut is tightened by a check washer, the single-ear or double-ear
check washer is bent towards and fit to the nut and the side surface of a connected part, so that
the nut can be locked. If the two bolts need double locking, a double-locking check washer can
be used, so that the two nuts are locked by each other; or a series-connecting steel wire is used,
and a low-carbon steel wire is penetrated into a head hole of each screw to connect the screws in
series, so that the screws are locked by each other. The loosening prevention by destroying the
movement relationship of the thread pair is to rivet an extension portion of the tail end of the bolt
after a riveting locknut is tightened, or to use a formed punch to punch at a seam between the tail
end of the bolt and the nut, and to use a punch point to prevent the loosening. This method is
reliable; and the thread pair can be disassembled, but the disassembled thread pair cannot be
reused.
At present, although a large number of self-locking nuts are applied, each variety of the nuts
is small and single in application occasion. The existing self-locking nut is complicated in
structure, diversified in forms, high in manufacturing cost, and inconvenient in maintenance. The
self-locking nut involves too many conditions such as self-locking varieties, quantity, application
environment, vibration, temperature rise, lubrication, material and friction pairs, which brings
difficulty to the research.
Summary
For the disadvantages of the existing self-locking bolt that the structure is complicated, the
Description
cost is high, the maintenance is inconvenient, the application function is single, and the
application occasion is limited, the present invention aims at providing an anti-loosening bolt
with a sawtooth structure, which is simple in structure, low in manufacturing cost, and capable of
meeting the application needs under the working conditions of high speed, large dynamic load,
great vibration, large temperature difference and lubrication.
The present invention adopts the technical solution as follows: a collet-structure locknut
includes a workpiece I, a workpiece II and a bolt connected and disposed in the workpiece I and
the workpiece II. The head of the bolt is connected and provided with a collect cone nut and an
inner cone nut. The collet cone nut is composed of a frustum and a regular hexagonal prism,
which are superimposed to form an integral structure. The center of the frustum and the regular
hexagonal prism is provided with a first threaded hole. The outer root of the frustum is provided
with a circle of radial annular groove. The conical wall of the frustum is provided with a
plurality of through grooves. The bottom of each through groove is provided with a circular
through hole penetrating through the conical wall. The circular through hole is communicated
with the through groove. The bottom surface of the collet cone nut is provided with a toothed
groove. A second threaded hole and an inner taper hole, which are superimposed, are arranged
inside the inner cone nut. The collet cone nut is screwed onto the bolt, so that the toothed groove
on the bottom of the collet cone nut closely contacts the surface of the workpiece II. The inner
cone nut is screwed onto the bolt, and when the inner taper hole is screwed with the frustum, a
radial force and an axial force are generated on a cone. The radial force drives the frustum of the
collet cone nut to retract towards the center of the bolt, and a thread profile of the first threaded
hole of the frustum further clamps the surface of the bolt to prevent the loosening. The axial
force pushes the collet cone nut to move towards the workpiece II; the bottom surface of the
collet cone nut contacts the workpiece II to generate the axial pressure; and the toothed groove
overcomes a reverse torque to further prevent the loosening.
The conicity of the inner taper hole is slightly smaller than the conicity of the frustum.
The first threaded hole and the second threaded hole have the same thread specification.
The through grooves are equally divided into three parts or six parts to be arranged on the
Description
conical wall of the frustum. The aperture of the circular through hole is greater than the width of
the through groove.
The opening direction of the toothed groove is opposite to the screwing direction of the
collet cone nut.
The toothed groove is a sawtooth groove. Each toothed groove has a same distance from
the bottom to the top. The quantity of the toothed groove is not less than 20.
The first threaded hole is concentric with the center of the regular hexagonal prism.
The present invention has the beneficial effects as follows: the collet-structure locknut
provided by the present invention is composed of the collect cone nut and the inner cone nut.
The center of the collet cone nut is provided with the threaded hole. The bottom surface of the
collet cone nut is provided with the toothed groove. The threaded hole and the inner taper hole
are formed in the inner cone nut. The collet cone toothed nut is installed and screwed with the
bolt or the stud until a thread profile portion on the end of the collet cone toothed nut contacts the
connected workpiece II, so that the toothed groove on the bottom of the collet cone nut closely
contacts the surface of the workpiece II. The inner cone nut is screwed onto the bolt. When the
inner taper hole is screwed with the frustum, the radial force and the axial force are generated on
the cone. The radial force drives the frustum of the collet cone nut to retract towards the center of
the bolt. The thread profile of the first threaded hole of the frustum further clamps the surface of
the bolt to prevent the loosening. The axial force pushes the collet cone nut to move towards the
workpiece II; the bottom surface of the collet cone nut contacts the workpiece II to generate axial
pressure; and the toothed groove overcomes the reverse torque to further prevent the loosening.
The collet-structure locknut is simple in structure and low in manufacturing cost and meets the
application needs under the working conditions of high speed, large dynamic load, great
vibration, large temperature difference and lubrication.
Description of Drawings
Fig. 1 is an overall installation structural schematic diagram of the present invention.
Fig. 2 is a complete section structural schematic diagram of an inner cone nut in the
Description
present invention.
Fig. 3 is a complete section structural schematic diagram of a collet cone nut in the present
invention.
Fig. 4 is a structural schematic diagram of a bottom surface of a collet cone nut in the
present invention.
Fig. 5 is a structural schematic diagram of a top surface of a collet cone nut in the present
invention.
Fig. 6 is an enlarged structural schematic diagram of a position A in Fig. 4.
Fig. 7 is a schematic diagram of a removed section at a position B-B in Fig. 6.
Fig. 8 is a structural schematic diagram of a collet cone nut in embodiment I.
Fig. 9 is a structural schematic diagram of a collet cone nut in embodiment II.
In the drawings: bolt 1; workpiece I2; workpiece II3; collet cone nut 4; through groove 4-1;
circular through hole 4-2; radial annular groove 4-3; first threaded hole 4-4; toothed groove 4-5;
frustum 4-6; regular hexagonal prism 4-7; inner cone nut 5; second threaded hole 5-1; inner taper
hole 5-2.
Detailed Description
The present invention is further described below in combination with the accompanying
drawings:
As shown in Figs. 1-7, a collet-structure locknut includes a workpiece I2, a workpiece II3
and a bolt 1 connected and disposed in the workpiece I2 and the workpiece II3. The head of the
bolt 1 is connected and provided with a collet cone nut 4 and an inner cone nut 5. The collet cone
nut 4 is composed of a frustum 4-6 and a regular hexagonal prism 4-7, which are superimposed
to form an integral structure. The center of the frustum 4-6 and the regular hexagonal prism 4-7
is provided with a first threaded hole 4-4. The outer root of the frustum 4-6 is provided with a
circle of radial annular groove 4-3. The conical wall of the frustum 4-6 is provided with a
plurality of through grooves 4-1. The bottom of each through groove 4-1 is provided with a
circular through hole 4-2 penetrating through the conical wall. The circular through hole 4-2 is
Description
communicated with the through groove 4-1. The bottom surface of the collet cone nut 4 is
provided with a toothed groove 4-5. A second threaded hole 5-1 and an inner taper hole 5-2 are
superimposed inside the inner cone nut 5. The collet cone nut 4 is screwed onto the bolt 1, so that
the toothed groove 4-5 on the bottom of the collet cone nut 4 closely contacts the surface of the
workpiece II3. The inner cone nut 5 is screwed onto the bolt 1, and when the inner taper hole
-2 is screwed with the frustum 4-6, a radial force and an axial force are generated on a cone.
The radial force drives the frustum of the collet cone nut 4 to retract towards the center of the
bolt 1, and a thread profile of the first threaded hole of the frustum further clamps the surface of
the bolt to prevent the loosening. The axial force pushes the collet cone nut 4 to move towards
the workpiece II 3; the bottom surface of the collet cone nut 4 contacts the workpiece II 3 to
generate the axial pressure; and the toothed groove 4-5 overcomes a reverse torque to further
prevent the loosening.
As shown in Figs. 1-7, in the collet-structure locknut, the conicity of the inner taper hole
-2 is slightly smaller than the conicity of the frustum 4-6. The first threaded hole 4-4 and the
second threaded hole 5-1 have same thread specification. The through groove 4-1 is equally
divided into three parts or six parts to be arranged on the conical wall of the frustum 4-6. The
aperture of the circular through hole 4-2 is greater than the width of the through groove 4-1. The
opening direction of the toothed groove 4-5 is opposite to the screwing direction of the collet
cone nut 4. The toothed groove 4-5 is a sawtooth groove. Each toothed groove 4-5 has a same
distance from the bottom to the top. The quantity of the toothed grooves 4-5 is not less than 20.
The first threaded hole 4-4 is concentric with the center of the regular hexagonal prism 4-7.
Embodiment I
As shown in Fig. 8, a collet-structure locknut is composed of a frustum 4-6 and a regular
hexagonal prism 4-7, which are superimposed to form an integral structure. The center of the
frustum 4-6 and the regular hexagonal prism 4-7 is provided with an unthreaded hole 4-4. The
center of the unthreaded hole is eccentric to the center of the regular hexagonal prism, and an
eccentric distance is e. The eccentric distance e makes the collet cone nut and an inner cone nut
form a cylindrical pair and a thread pair respectively for the bolt to generate a mutual restrictive
Description
effect. The eccentric distance e is adjusted according to the application occasion, pitch
characteristic, material, heat treatment and surface treatment of the bolt. The outer root of the
frustum 4-6 is provided with a circle of radial annular groove 4-3. The conical wall of the
frustum 4-6 is provided with six through grooves 4-1. The bottom of each through groove 4-1 is
provided with a circular through hole 4-2 penetrating through the conical wall. The circular
through hole 4-2 is communicated with the through groove 4-1. The bottom surface of the collet
cone nut 4 is provided with 52 sawteeth 4-5. An angle between every two sawteeth is a. Each
sawtooth has a distance b from the top to the bottom.
Embodiment II
As shown in Fig. 9, in a collet-structure locknut, a collet cone nut 4 is composed of a
frustum 4-6 and a regular hexagonal prism 4-7, which are superimposed to form an integral
structure. The center of the frustum 4-6 and the regular hexagonal prism 4-7 is provided with a
threaded hole 4-4. The center of the threaded hole is eccentric to the center of the regular
hexagonal prism, and an eccentric distance is e. The eccentric distance e makes the collet cone
nut and an inner cone nut form two nut pairs respectively for the bolt to generate a restrictive
effect. The eccentric distance e is adjusted according to the application occasion, pitch
characteristic, material, heat treatment and surface treatment of the bolt. The outer root of the
frustum 4-6 is provided with a circle of radial annular groove 4-3. The conical wall of the
frustum 4-6 is provided with six through grooves 4-1. The bottom of each through groove 4-1 is
provided with a circular through hole 4-2 penetrating through the conical wall. The circular
through hole 4-2 is communicated with the through groove 4-1. The bottom surface of the collet
cone nut 4 is provided with 52 sawteeth 4-5. An angle formed between every two sawteeth is a,
and each sawtooth has a distance b from the top to the bottom.
As shown in Figs. 1-9, an application principle of the collet-structure locknut is as follows:
The collet cone toothed nut is firstly installed and screwed with the bolt or stud until a
thread profile portion on the end of the collet cone toothed nut contacts the surface of the
connected workpiece, and when attaining a specified pre-tightening torque, the installation of the
collet cone toothed nut is finished. The inner cone nut is screwed with the bolt or the stud, and
Description
after being matched with an outer cone collet of the collet cone toothed nut, the inner cone nut is
continuously screwed so as to be screwed with the bolt or the stud. After continuously matching
with the outer cone collet of the collet cone toothed nut and attaining the specified deformation
of a collet cone, the inner cone nut reaches a specified position. The collet frustum of the collet
cone toothed nut is deformed to the specified position; the internal thread profile is tightly
clamped on the thread profile of the bolt or the stud screwed therewith; the axial force transfers
the axial pressure generated by the collet cone nut to the workpiece from the bottom surface; and
the toothed groove overcomes the reverse torque to further prevent the loosening.
An inner cone of the inner cone nut is matched with the outer cone of the collet cone
toothed nut. By adopting a collet chuck structure, a threaded portion of the inner cone is screwed
with the bolt or the stud, and the inner cone is driven to move towards the connected workpiece
along the axis direction of the bolt or the stud. The inner cone generates pressure perpendicular
to the inner cone in this movement process. The pressure perpendicular to the inner cone is
transferred to the collet cone toothed nut matched with the inner cone. The pressure is
decomposed into a force in an axial direction and a force perpendicular to the axis direction of
the bolt or the stud. The force perpendicular to the axis direction of the bolt or the stud drives the
collet frustum of the collet cone toothed nut to retract along a radial direction. When in retraction,
a component force in the radial direction clamps the internal thread profile tightly on the thread
profile of the bolt screwed with the frustum, which plays a role in further deformation. Therefore,
this process relies on the force generated in the radial direction to cause the deformation of the
collet cone to achieve a purpose of locking and loosening prevention. The axial force enables the
thread profile on the end of the collet cone toothed nut to produce slight elastic deformation for
the workpiece so as to prevent the reverse rotation of the collet cone toothed nut caused by
dynamic loads, forced transverse and longitudinal vibrations, temperature difference changes and
lubrication. The lower surface of the collet cone toothed nut contacts the workpiece, and in the
self-locking process, the teeth on the lower end surface contacts the surface of the workpiece.
For the right-hand thread, as shown in the figures, the clockwise rotation is only allowed; and the
counterclockwise rotation is blocked. On the contrary, for the left-hand thread pair, the direction
Description
of teeth is just opposite to that shown in the figures, which is suitable for the locking of the
left-hand thread pair. The upper end cone portion of the collet cone toothed nut has an elastic
function. By means of the grooves that are equally divided into six parts or three parts along the
circumference of the cone and the circular holes on the bottom of each groove, and in
combination with the heat treatment of the material, this portion can automatically retract
towards the axis of the cone under the action of the inner cone in the elastic range. Meanwhile,
when the inner cone relieves the force, this portion can be automatically returned to the original
position. As shown in Fig. 8, the inner hole and its center 01 of the collet cone sawtooth "nut"
have eccentricity e relative to a geometric center 0 of its appearance, so that the upper nut and
lower nut form a cylindrical pair and a thread pair respectively for the bolt to generate a mutual
restrictive effect. As shown in Fig. 9, the threads and its center 01 of the collet cone toothed nut
have eccentricity e relative to the geometric center 0 of its appearance, so that the upper nut and
the lower nut form two nut pairs respectively for the bolt to generate the mutual restrictive effect.
The collet cone toothed nut and the inner cone nut have same appearance dimensions with a
standard part with the same specification, which is convenient for designers to select the nut and
locknut with the same specification and to select the bolt standard part according to the original
standard bolt. When the nut is used for connecting nonmetal materials, a metal washer can be
embedded into the surface matched with the collet cone toothed nut to prevent the collet cone
toothed nut from being embedded into the connected workpiece.
Claims (7)
1. A collet-structure locknut, comprising a workpiece 1(2), a workpiece 11(3) and a bolt (1)
connected and disposed in the workpiece 1(2) and the workpiece 11(3), wherein the head of the
bolt (1) is connected and provided with a collet cone nut (4) and an inner cone nut (5); the collet
cone nut (4) is composed of a frustum (4-6) and a regular hexagonal prism (4-7), which are
superimposed to form an integral structure; the center of the frustum (4-6) and the regular
hexagonal prism (4-7) is provided with a first threaded hole (4-4); the outer root of the frustum
(4-6) is provided with a circle of radial annular groove (4-3); the conical wall of the frustum (4-6)
is provided with a plurality of through grooves (4-1); the bottom of each through groove (4-1) is
provided with a circular through hole (4-2) penetrating through the conical wall; the circular
through hole (4-2) is communicated with the through groove (4-1); the bottom surface of the
collet cone nut (4) is provided with a toothed groove (4-5); a second threaded hole (5-1) and an
inner taper hole (5-2) are superimposed inside the inner cone nut (5); the collet cone nut (4) is
screwed onto the bolt (1), so that the toothed groove (4-5) on the bottom of the collet cone nut (4)
closely contacts the surface of the workpiece 11(3); the inner cone nut (5) is screwed onto the bolt
(1); when the inner taper hole (5-2) is screwed with the frustum (4-6), a radial force and an axial
force are generated on a cone; the radial force drives the collet cone nut (4) to retract towards the
center of the bolt (1) to further clamp the surface of the bolt to prevent the loosening; the axial
force pushes the collet cone nut (4) to move towards the workpiece 11(3); the bottom surface of
the collet cone nut (4) contacts the workpiece 11(3) to generate the axial pressure; and the toothed
groove (4-5) overcomes a reverse torque to further prevent the loosening.
2. The collet-structure locknut according to claim 1, wherein the conicity of the inner taper
hole (5-2) is smaller than the conicity of the frustum (4-6).
3. The collet-structure locknut according to claim 1, wherein the first threaded hole (4-4)
and the second threaded hole (5-1) have same thread specification.
4. The collet-structure locknut according to claim 1, wherein the through groove (4-1) is
equally divided into three parts or six parts to be arranged on the conical wall of the frustum
(4-6); and the aperture of the circular through hole (4-2) is greater than the width of the through
groove (4-1).
Claims
5. The collet-structure locknut according to claim 1, wherein the opening direction of the
toothed groove (4-5) is opposite to the screwing direction of the collet cone nut (4).
6. The collet-structure locknut according to claim 1, wherein the toothed groove (4-5) is a
sawtooth groove; each toothed groove (4-5) has a same distance from the bottom to the top; and
the quantity of the toothed grooves (4-5) is not less than 20.
7. The collet-structure locknut according to claim 1, wherein the first threaded hole (4-4) is
concentric or eccentric with the center of the regular hexagonal prism (4-7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102934A AU2020102934A4 (en) | 2020-10-21 | 2020-10-21 | Collet-structure locknut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102934A AU2020102934A4 (en) | 2020-10-21 | 2020-10-21 | Collet-structure locknut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020102934A4 true AU2020102934A4 (en) | 2020-12-24 |
Family
ID=73838799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020102934A Ceased AU2020102934A4 (en) | 2020-10-21 | 2020-10-21 | Collet-structure locknut |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2020102934A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115338605A (en) * | 2022-09-14 | 2022-11-15 | 中冶华天工程技术有限公司 | Method for manufacturing and using workpiece moving chute |
-
2020
- 2020-10-21 AU AU2020102934A patent/AU2020102934A4/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115338605A (en) * | 2022-09-14 | 2022-11-15 | 中冶华天工程技术有限公司 | Method for manufacturing and using workpiece moving chute |
| CN115338605B (en) * | 2022-09-14 | 2024-03-22 | 中冶华天工程技术有限公司 | Manufacturing and using method of workpiece moving chute |
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| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |