CN212028297U

CN212028297U - Combined locking nut

Info

Publication number: CN212028297U
Application number: CN202020558831.1U
Authority: CN
Inventors: 王诗娴
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2020-11-27
Anticipated expiration: 2030-04-16

Abstract

A combined locking nut belongs to the field of fastening elements and comprises an outer sleeve and an inner sleeve; the outer sleeve is positioned outside the inner sleeve and is annular; the periphery of the outer sleeve is polygonal and is adapted to the specification of the appearance of the nut in national standard; the hole of the outer sleeve is in a pyramid shape, the large end of the outer sleeve is an inner sleeve insertion end, and the small end of the outer sleeve is a limiting end; the inner hole of the outer sleeve is a pyramid formed by equal edges, and the number of the edges is more than 3; the locking device has the characteristics of quick locking, firmness, durability and reusability.

Description

Combined locking nut

Technical Field

The utility model belongs to the locking element field among the mechanical parts, in particular to a combination lock nut for preventing pine takes off.

Background

In mechanical equipment and a connecting structure needing nut fastening, nuts are often adopted for connection and fastening, in some key connecting parts, due to the structural characteristics of threads, the nuts can loosen on external threads under the conditions of vibration or stress relief, and for some important structural parts connected by the nuts, the connecting nuts are required not to loosen, otherwise serious consequences can be caused to connecting components, such as positions which are not frequently overhauled or are not easily replaced or positions which are frequently vibrated, and the like, so that higher requirements are provided for the connecting nuts; or the threads of the nut and the threads of the screw rod are staggered by adopting multiple threads or eccentric threads, so that the gap between the nut and the screw rod is eliminated, and the aim of locking is fulfilled; in addition, the nut is made of a flexible material and is sleeved between the nut and the screw to form filling, so that the purpose of locking the nut is achieved; the method has the defects that when the retaining pin is used for locking, the retaining pin is positioned in the same position of the pin hole on the nut and the pin hole, and meanwhile, a gap exists between the retaining pin and the pin hole, so that the pin hole on the nut and the pin hole on the screw cannot be exactly positioned in the same position when the nut is locked, the gap is easily left between the nut and the screw and a part to be locked, the retaining pin cannot be used for locking in a locking state, and the method can only be used in occasions with low requirements on locking precision; for the situation of filling type locking, most of filling materials are plastics such as nylon, the filling materials are easily damaged after being locked for several times and need to be replaced frequently, and the locking force is limited in high-strength locking occasions due to the large elasticity of the plastics; the nut manufactured by adopting the eccentric threads or the double-pitch threads is difficult to manufacture, has small application range and is unreliable in strong locking.

Disclosure of Invention

The above-mentioned problem that locking mode and lock nut to current nut exist, the utility model provides a combination lock nut, its characterized in that: comprises an outer sleeve and an inner sleeve; the outer sleeve is positioned outside the inner sleeve and is annular; the periphery of the outer sleeve is polygonal and is adapted to the specification of the appearance of the nut in national standard; the hole of the outer sleeve is in a pyramid shape, the large end of the outer sleeve is an inner sleeve insertion end, and the small end of the outer sleeve is a limiting end; the inner hole of the outer sleeve is a pyramid formed by equal edges, and the number of the edges is more than 3; the inclination of the conical surface formed by the two edges of the inner hole of the outer sleeve is 0.5-30 degrees, namely the half cone angle; the inclination of the conical surface of the inner hole of the outer sleeve is matched with the inclination of the conical surface of the periphery of the inner sleeve; the inner sleeve is arranged in the outer sleeve and is sleeved with the outer sleeve; the inner sleeve is in a thin-wall annular shape, an inner hole of the inner sleeve is a threaded hole, and the specification and the size of the threaded hole are matched with those of an external thread on a screw to be locked; the periphery of the inner sleeve is in a pyramid shape, and the number of edges of the inner sleeve is the same as that of the pyramid edges of the inner hole in the outer sleeve; the conical surface of the pyramid at the periphery of the inner sleeve has an inclination which is matched with the inclination of the conical surface of the inner hole on the outer sleeve; the two ends of the inner sleeve are provided with locking grooves, and the width or the sum of the widths of the locking grooves is larger than the circumferential length difference under the minimum diameter after the clearance between the threaded hole of the inner sleeve and the external thread of the matched and locked screw rod is eliminated; more than one locking groove penetrates through the thickness of the inner sleeve; the wall thickness of the inner sleeve is greater than the thread height of the inner threaded hole of the inner sleeve.

Further, the outer periphery of the jacket is in an equilateral hexagon shape; the size of the outer sleeve can be reduced, materials are saved, and the wrench can be suitable for operating according with national standards.

Furthermore, the inner hole of the outer sleeve is hexagonal; easily contrasts with the hexagonal shape of the periphery and is uniformly stressed in the circumferential direction.

Furthermore, the inclination of the conical surface of the inner hole of the outer sleeve is less than or equal to that of the outer surface of the inner sleeve.

Furthermore, a plurality of locking grooves are formed in the inner sleeve and are uniformly distributed on the circumference of the inner sleeve.

Furthermore, the locking grooves on the inner sleeve are respectively positioned at two ends of the inner sleeve and are distributed in a crossed manner.

Furthermore, the length of the locking groove on the inner sleeve is greater than one third of the length of the inner sleeve.

Furthermore, the periphery of the inner sleeve is a hexagonal pyramid.

Furthermore, arc-shaped chamfers are arranged at edges of the inner hole pyramid of the outer sleeve and the periphery pyramid of the inner sleeve.

Further, the outer sleeve and the inner sleeve are made of metal materials.

Furthermore, the outer sleeve and the inner sleeve are made of steel or copper materials.

Advantageous effects

The utility model has the advantages of convenient use, similar use method to the common nut, and no need of filler; the locking effect is good, and the reuse can be realized.

Drawings

FIG. 1 is a schematic structural diagram of the present invention

1. An outer sleeve and 2 an inner sleeve.

FIG. 2 is a schematic view of the structure of the jacket

11. The outer sleeve is in the shape of 12, the inner hole small end of the outer sleeve is in the shape of a pyramid 13, and the inner hole large end of the outer sleeve is in the shape of a pyramid 14.

FIG. 3 is a schematic view of the inner sleeve

21. The inner sleeve comprises an inner sleeve small end, 22 inner sleeve pyramids, 23 inner sleeve large ends, 24 large end contraction grooves, 25 small end contraction grooves and 26 inner sleeve internal thread holes.

Detailed Description

In order to further explain the technical scheme of the utility model, the specific implementation mode of the utility model is described with reference to the accompanying drawings, as shown in fig. 1 and fig. 2, in this example, the materials of the outer sleeve 1 and the inner sleeve 2 are made of steel materials, so that the strength and the rigidity of the locknut can be improved, and the locknut can be applied to occasions with large bearing capacity; in the embodiment, the outer periphery of the outer sleeve 1 is in an equilateral hexagon shape, and the distance between opposite sides of the hexagon meets the peripheral size of a common hexagonal nut of the national standard; in the embodiment, a hexagonal opposite side distance of 41 mm (M27 national standard nut) is selected; the length of the jacket 1 is 28 mm, the inner hole pyramid 13 of the jacket is selected to be a hexagonal pyramid,

selecting the distance between the hexagonal opposite edges of the large end of the inner hole of the outer sleeve as 29 mm, and the distance between the hexagonal opposite edges of the small end of the inner hole of the outer sleeve as 26.12 mm; arranging an arc chamfer at the edge of the large end 14 of the inner hole of the outer sleeve, wherein the radius of the arc of the chamfer is distributed on the edge along the edge according to the same inclination as the prismatic surface; this completes the implementation of the jacket 1; in the embodiment, the inner sleeve 2 is selected to be made of steel materials, the periphery of the inner sleeve 2 is in a hexagonal pyramid shape which is the same as the inner hole of the outer sleeve 1, the distance between the hexagonal opposite sides of the large end 23 of the inner sleeve is 30 mm, the distance between the hexagonal opposite sides of the small end 21 of the inner sleeve is 27.12 mm, and the length of the inner sleeve is 23 mm; each edge is provided with an arc chamfer matched with the arc chamfer of the edge of the inner hole of the jacket; in the embodiment, the size of the inner sleeve internal thread hole 26 is the common internal thread of the national standard M27; the large end 23 of the inner sleeve is provided with three large end contraction grooves 24 which are distributed along the circumference of the inner hole, the width of each large end contraction groove is 1.5 mm, the depth of each large end contraction groove is 15 mm, and the large end contraction grooves penetrate through the wall thickness of the inner sleeve 2; 3 inner sleeve small end contraction grooves 25 which are uniformly distributed along the circumference of the inner hole are arranged at the inner sleeve small end 21, the groove width is 1.5 mm, the groove depth is 14.5 mm, and the wall thickness of the inner sleeve 2 is thick in the process; thus, the inner sleeve 2 is implemented.

When the device is applied, the inner sleeve 2 is sleeved in the inner hole of the outer sleeve 1, and the small end of the inner sleeve 2 and the small end of the inner hole of the outer sleeve 1 are positioned in the same direction; the inner threaded hole of the inner sleeve 2 is screwed on a screw rod to be fastened, the big end is positioned on one side of a member to be fastened, the periphery of the outer sleeve 1 is rotated, the inner sleeve 2 advances along the screw rod under the action of the inner threaded hole, the outer sleeve 1 continues to rotate after the big end of the inner sleeve 2 is contacted with the member to be fastened, at the moment, the inner sleeve 2 cannot continue to advance along the screw rod due to the blocking of the member to be fastened, another common standard nut is installed on the end surface of the small end of the inner hole of the outer sleeve 1, the common nut is rotated, the common nut advances on the screw rod, after the end surface of the common nut is contacted with the small end of the inner hole of the outer sleeve 1 (hereinafter referred to as the small end of the outer sleeve), the common nut continues to rotate, the outer sleeve 1 is pressed by the common nut to move forwards along the peripheral pyramid surface of the inner sleeve 2, the outer sleeve inner hole compresses the appearance of the inner, the inner sleeve internal thread hole 26 on the inner sleeve 2 is contracted, the diameter is reduced, the inner sleeve internal thread hole 26 is tightly attached to the external thread on the screw rod, the gap between the threads is eliminated, prestress is applied to the inner sleeve internal thread hole, the purposes of preventing the threads from loosening and locking the threads are achieved, and if the space is insufficient, the common nut can be dismounted; when the locking nut needs to be disassembled, a wrench is adopted to clamp the outer sleeve 1, the outer sleeve 1 is rotated to the loosening direction of the thread rotation, and the inner sleeve 2 is withdrawn from the screw rod, so that the nut is disassembled; the outer sleeve 1 and the inner sleeve 2 are separated, so that a use cycle of the utility model is completed, and the locking device is widely applied to occasions requiring the prevention of automatic nut loosening and clearance elimination in the screw nut locking device; the utility model discloses simple structure, intensity rigidity is high, and is durable to can used repeatedly, simple to operate is swift.

Claims

1. The utility model provides a combination lock nut which characterized in that: comprises an outer sleeve and an inner sleeve; the outer sleeve is positioned outside the inner sleeve and is annular; the periphery of the outer sleeve is polygonal; the hole of the outer sleeve is in a pyramid shape, the large end of the outer sleeve is an inner sleeve insertion end, and the small end of the outer sleeve is a limiting end; the inner hole of the outer sleeve is a pyramid formed by equal edges, and the number of the edges is more than 3; the inclination of the conical surface formed by the two edges of the inner hole of the outer sleeve is 0.5-30 degrees, namely the half cone angle; the inclination of the conical surface of the inner hole of the outer sleeve is matched with the inclination of the conical surface of the periphery of the inner sleeve; the inner sleeve is arranged in the outer sleeve and is sleeved with the outer sleeve; the inner sleeve is in a thin-wall annular shape, an inner hole of the inner sleeve is a threaded hole, and the specification and the size of the threaded hole are matched with those of an external thread on a screw to be locked; the periphery of the inner sleeve is in a pyramid shape, and the number of edges of the inner sleeve is the same as that of the pyramid edges of the inner hole in the outer sleeve; the conical surface of the pyramid at the periphery of the inner sleeve has an inclination which is matched with the inclination of the conical surface of the inner hole on the outer sleeve; the two ends of the inner sleeve are provided with locking grooves, and the width or the sum of the widths of the locking grooves is larger than the circumferential length difference under the minimum diameter after the clearance between the threaded hole of the inner sleeve and the external thread of the matched and locked screw rod is eliminated; more than one locking groove penetrates through the thickness of the inner sleeve; the wall thickness of the inner sleeve is greater than the thread height of the inner threaded hole of the inner sleeve.

2. The combination lock nut of claim 1, wherein: the periphery of the jacket is in an equilateral hexagon shape.

3. The combination lock nut of claim 1, wherein: the inner hole of the outer sleeve is hexagonal.

4. The combination lock nut of claim 1, wherein: the inclination of the conical surface of the inner hole of the outer sleeve is less than or equal to that of the outer surface of the inner sleeve.

5. The combination lock nut of claim 1, wherein: the locking grooves on the inner sleeve are uniformly distributed on the circumference of the inner sleeve.

6. The combination lock nut of claim 1, wherein: the locking grooves on the inner sleeve are respectively positioned at two ends of the inner sleeve and are distributed in a crossed manner.

7. The combination lock nut of claim 1, wherein: the length of the locking groove on the inner sleeve is greater than one third of the length of the inner sleeve.

8. The combination lock nut of claim 1, wherein: the periphery of the inner sleeve is a hexagonal pyramid.

9. The combination lock nut of claim 1, wherein: the edges of the inner hole pyramid of the outer sleeve and the periphery pyramid of the inner sleeve are provided with arc-shaped chamfers.