CN112392840B - Lock nut - Google Patents
Lock nut Download PDFInfo
- Publication number
- CN112392840B CN112392840B CN201910757886.7A CN201910757886A CN112392840B CN 112392840 B CN112392840 B CN 112392840B CN 201910757886 A CN201910757886 A CN 201910757886A CN 112392840 B CN112392840 B CN 112392840B
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- CN
- China
- Prior art keywords
- lock nut
- nut
- lock
- locking
- branches
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000013011 mating Effects 0.000 claims abstract description 15
- 230000000284 resting effect Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or 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
- F16B37/00—Nuts or like thread-engaging members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention relates to a lock nut, the lock nut (2) being capable of resting on an end piece (1) at an axial end side thereof, the lock nut (2) comprising a nut body (21), the nut body (21) having a central bore provided with an internal thread for mating with an external thread of a mating piece (3), wherein the lock nut (2) further comprises a locking portion extending axially from the nut body (21) to the axial end side, the locking portion comprising a plurality of circumferentially distributed locking branches (22), wherein the direction of extension of the locking branches (22) from the nut body to the axial end side is inclined to the axis (X) of the lock nut (2) such that the locking branches (22) are capable of deforming when the lock nut (2) is resting on the end piece (1) to generate a moment (T) preventing loosening of the lock nut (2).
Description
Technical Field
The invention relates to a lock nut.
Background
The lock nut can be mounted to a mating member such as a shaft member or a bolt by its internal thread, and can be used for positioning and fixing a member located on the end side of the lock nut. For example, a lock nut can be mounted on the spindle, the lock torque of the lock nut providing an axial load to the spindle bearing to maintain proper play of the spindle bearing. The locking nut is provided with a locking and anti-loosening mechanism, so that the locking nut is not loosened even under severe working conditions such as vibration, impact and the like.
Various locking mechanisms for lock nuts are known from the prior art. One conventional lock nut has a cylindrical nut body, and a plurality of through holes penetrating from an outer peripheral surface to an inner peripheral surface are provided in a circumferential direction of the nut body. When the lock nut is assembled, after the nut body is screwed onto the external thread of the rotary shaft, the set screw is screwed into the through hole, and the set screw bites into the external thread portion of the rotary shaft, thereby preventing the loosening of the nut. For example, patent document 201410553374.6 discloses a lock nut using the above locking mechanism.
However, the current lock nuts have the following main problems: on the one hand, the lock nut loosens after a period of operation. For example, can lead to failure of the spindle bearings, which can cause serious damage to the spindle system. Such failures occur more frequently and the time costs and economic costs required for maintenance are higher. On the other hand, the present lock nut often includes two or more mating parts, and the locking effect is achieved by the cooperation between these mating parts, so that the working procedures such as machining, assembling, etc. are complicated. On the other hand, under very strict assembly conditions, for example, axial load is applied to the spindle bearing by the lock nut to maintain play, the flatness requirement of the contact surface between the lock nut and the spindle bearing is very high, and the perpendicularity requirement between the contact surface and the axis of the lock nut is also very high, so that the manufacturing cost of the lock nut is increased.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the lock nut which has good anti-loosening effect, is convenient to assemble and has low cost.
This technical problem is solved by a lock nut which can be abutted against an end-side piece located at an axial end side thereof, the lock nut comprising a nut body having a central bore provided with an internal thread for cooperation with an external thread of a mating piece.
According to the present invention, the lock nut further comprises a lock portion extending from the nut body base in the axial direction to the axial end side, the lock portion comprising a plurality of lock branch portions distributed circumferentially, wherein an extending direction of the lock branch portions extending from the nut body to the axial end side is inclined from an axis of the lock nut, so that the lock branch portions can be deformed to generate a moment preventing the lock nut from loosening when the lock nut abuts against the end side member.
In the context of the present invention, the axis of the lock nut refers to the central axis of the central bore of the nut body. Unless otherwise indicated, the terms "circumferential", "axial" and "radial" are relative to the axis.
The present invention is not limited to the shape of the lock nut on the radially outer side or to the shape of the nut body on the radially outer side. For example, the union nut or nut body as a whole can be polygonal, in particular regular polygonal, in particular circular.
In the context of the invention, the fitting can be a component, for example a shaft or a bolt, which has an external thread at least in sections for fitting with an internal thread of a lock nut. The mating element may be stationary in the operating state, or may be in a rotational or other form of movement.
In the context of the invention, the end piece is located on the axial end side of the lock nut and should be able to abut against the lock nut in the assembled state. The end piece can be placed on the mating piece or can also be part of the mating piece. Or the end side pieces can be separate parts from the mating pieces and not connected to the mating pieces.
The locking portions or locking branches extend substantially axially from the nut body to an axial end side which can extend to the end side piece. The locking branches form free ends on the axial end side or on the side remote from the nut body, so that a plurality of structures can be formed which resemble cantilevers. In the context of the present invention, substantially axially means in a direction which is not exactly perpendicular to the axis of the lock nut.
The extending direction of each locking branch portion extending from the nut body to the axial end side is inclined with respect to the axis of the lock nut. For example, the extending direction of each of the locking branch portions is biased toward the same circumferential direction of the lock nut in accordance with the rotation direction of the internal thread, i.e., the extending direction of each of the locking branch portions is biased in a clockwise direction or a counterclockwise direction in the circumferential direction of the lock nut as viewed from one axial end portion of the lock nut. The extending direction of the locking branch portion means a direction from the nut main body side end portion toward the free end.
In the context of the present invention, the direction of rotation of the internal thread, i.e. the direction of the helix of the internal thread, may be right-handed or left-handed. Right-handed threads follow the principle of clockwise direction, i.e. when the screw is rotated in a clockwise direction, as seen from either end of the screw towards the part provided with the screw, the screw will move away from the viewer. In contrast, left-handed threads follow the principle of counter-clockwise direction, i.e. when the screw is rotated in a counter-clockwise direction, as seen from either end of the screw towards the component provided with the screw, the screw will move away from the viewer.
If the internal thread of the lock nut is a right-hand thread, the extending direction of the lock branch portion coincides with the clockwise direction in the circumferential direction of the nut body when viewed axially toward the lock portion.
If the internal thread of the lock nut is a left-hand thread, the extending direction of the lock branch portion coincides with the counterclockwise direction in the circumferential direction of the nut body when viewed axially toward the lock portion.
By means of the technical scheme, when the lock nut abuts against the end side piece, the end side piece applies axial pre-tightening load to the locking part, and in this case, each locking branch part can deform to generate a moment for preventing the lock nut from loosening, and the moment can enable at least the inner thread tooth surface of the lock nut in the nut main body and the outer thread tooth surface of the matching piece to be pressed, so that a good anti-loosening effect is achieved. In particular, even when the lock nut rotates at a high speed with a mating member such as a spindle, a good anti-loosening effect can be achieved. In addition, since the locking portions or the locking branch portions can be compensated for by deformation, even under the working condition that the assembly requirements are very strict, the contact surfaces of the end side pieces on the locking branch portions do not need to be processed more precisely, i.e., the precision in particular in terms of flatness and perpendicularity can be reduced appropriately, thereby saving the cost. In addition, the lock nut is a single piece, so that the process especially in the assembly aspect is simplified, and the cost is saved.
In an advantageous embodiment, the locking branch protrudes from an axial end face of the nut body. Therefore, on one hand, the position of the anti-loosening moment generated by deformation of the locking branch part is more beneficial to compacting the tooth surfaces of the internal and external threads, so that a better anti-loosening effect is realized. On the other hand, the union nut can have a smaller radial dimension, so that it can be installed in a comparatively small installation space.
In a further advantageous embodiment, the end faces of the locking branches on the axial end sides are all planar and all lie in the same plane perpendicular to the axis. In this case, the lock nut can be advantageously used in cases where the assembly requirements are very strict, for example, in cases where an axial load is provided to the spindle bearing with high accuracy to maintain an appropriate play of the spindle bearing.
In a preferred embodiment, the radially inner surface of the locking portion is designed as a circumferential surface, the radially inner surface having the same radial dimension as the central bore, and the internal thread is arranged continuously in the locking portion and the central bore. Thus, on the one hand, such a structure has convenience in terms of manufacturing; on the other hand, under the axial pretension load effect of the matching piece, each locking branch part can deform, and when the anti-loosening effect is realized according to the anti-loosening torque, the pitch of the internal thread at the locking part can be reduced, so that the compression fit among the thread tooth surfaces at the locking part is further enhanced, and the anti-loosening effect is enhanced.
In an advantageous embodiment, the radially outer surface of the locking portion is designed as a circumferential surface, and the radial dimension of the radially outer surface is smaller than the smallest radial dimension of the outer surface of the nut body. This makes it possible to avoid any possible interference of the individual locking branches with their installation space during deformation.
Preferably, the locking branches are distributed uniformly in the circumferential direction of the nut body at least in groups. That is, the locking branch groups are preferably uniformly distributed in the circumferential direction. Particularly preferably, the locking branch groups are distributed uniformly in the circumferential direction and the individual locking branches within the locking branch groups are also distributed uniformly in the circumferential direction. In this case, it is particularly preferable that the locking branches are uniformly distributed in the circumferential direction of the nut body. Thereby be favorable to on the nut main part of locking moment evenly distributed, locking effect is good, and be favorable to lock nut's life.
In an advantageous embodiment, the locking portion and the nut body are of one-piece construction. Therefore, the advantages of convenient manufacture, low cost and good anti-loosening effect are realized.
Drawings
Preferred embodiments of the present invention are schematically illustrated below with reference to the accompanying drawings. The attached drawings are as follows:
figure 1 is a partial side view of a spindle system having a lock nut according to a preferred embodiment,
Figure 2 is a perspective view of the lock nut according to figure 1,
Figure 3 is a front view of the lock nut according to figure 1,
FIG. 4 is a half cross-sectional view of the lock nut according to FIG. 1, and
Fig. 5 is a schematic view of the principle of locking the lock nut according to fig. 1.
In the various figures, identical or functionally identical components are provided with the same reference numerals.
Detailed Description
Fig. 1 shows a partial side view of a spindle system with a lock nut 2 according to a preferred embodiment. The lock nut 2 is screwed with the spindle 3 and abuts against the spindle bearing 1 at the axial end side thereof to maintain an appropriate play of the spindle bearing 1.
Fig. 2 shows a perspective view of the lock nut according to fig. 1. Fig. 3 and 4 show a front view and a half-section view, respectively, of the lock nut according to fig. 1. As can be seen in connection with fig. 2, 3 and 4, the lock nut 2 is integrally formed in a ring shape and includes a nut body 21 and a locking portion which are integrally formed. The nut body 21 has a central hole. The radially inner surface of the locking portion is designed as a circumferential surface, the radially inner surface has the same radial dimension as the center hole, and the internal thread is continuously provided in the locking portion and the center hole. The radially outer surface of the locking portion is designed as a circumferential surface, and the diameter of the radially outer surface is smaller than the diameter of the outer circumferential surface of the nut body 21. An internal thread (not shown) for mating with the external thread of the spindle 3 is continuously provided in the locking portion and the central hole.
In this embodiment, the internal thread of the lock nut 2 is a right-hand thread, and the extending direction of the lock branch portion 22 coincides with the clockwise direction in the circumferential direction of the nut body 21 when viewed axially toward the lock portion, as shown in fig. 2 and 3.
The locking portion includes a plurality of locking branches 22. In the present embodiment, these locking branches 22 are uniformly distributed in the circumferential direction. The locking branch 22 extends substantially in the axial direction from the axial end face of the nut body, and forms a free end on the side remote from the nut body 21. The axial end faces of the respective locking branches 22 at the free ends are all planar, all lie in the same plane perpendicular to the axis X (see fig. 1) of the lock nut 2, and all rest against the end piece 1.
Fig. 5 is a schematic view of the principle of locking the lock nut according to fig. 1. As shown on the left side of fig. 5, after the assembly is completed, the bearing applies an axial preload F to each of the lock branches, which is a reaction force to the axial load provided to the spindle bearing by the lock nut. As shown on the right side of fig. 5, each locking branch 22 constitutes a cantilever-like structure. The locking branch portion 22 forms a moment T as shown in the figure due to the axial pre-tightening load F, and the moment T can make the internal thread pitch of the locking nut and the external thread pitch of the main shaft different, so that the internal thread tooth surface and the external thread tooth surface are further compressed, thereby achieving a good anti-loosening effect. At the same time, the locking branch portion 22 is deformed from the shape schematically shown by the solid line in the drawing to the shape schematically shown by the broken line in the drawing by the axial preload F, and the original pitch of the internal thread in the locking portion is reduced, thereby enhancing the loosening prevention effect. In addition, since the locking portions or the locking branch portions can compensate for the deviation by deformation, even under the working condition that the assembly requirements are very strict, the contact surfaces of the locking branch portions, which are in contact with the end side pieces, do not need to be processed more precisely, i.e., the precision, particularly in terms of flatness and perpendicularity, can be reduced appropriately, thereby saving the cost. In addition, the lock nut is a single piece, so that the process especially in the assembly aspect is simplified, and the cost is saved.
While possible embodiments are exemplarily described in the above description, it should be understood that there are numerous variations of the embodiments still through all known and furthermore easily conceivable combinations of technical features and embodiments by the skilled person. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. The technical teaching for converting at least one exemplary embodiment is provided more in the foregoing description to the skilled person, wherein various changes may be made without departing from the scope of the claims, in particular with regard to the function and structure of the components.
List of reference numerals
1. End side piece and main shaft bearing
2. Lock nut
21. Nut main body
22. Locking branch part
3. Fitting piece, spindle
X axis
F axial pretension load
T moment
Claims (8)
1. A lock nut, said lock nut (2) being capable of being abutted against an end-side member (1) located at an axial end side thereof, said lock nut (2) comprising a nut body (21), said nut body (21) having a central hole provided with an internal thread for mating with an external thread of a mating member (3), characterized in that,
The lock nut (2) further comprises a locking portion extending axially from the nut body (21) to the axial end side, the locking portion comprising a plurality of circumferentially distributed locking branches (22), wherein the extending direction of the locking branches (22) extending from the nut body (21) to the axial end side is inclined to the axis (X) of the lock nut (2), and if the internal thread of the lock nut (2) adopts a right-handed thread, the extending direction of the locking branches (22) coincides with a clockwise direction in the circumferential direction of the nut body (21) when viewed axially towards the locking portion, and if the internal thread of the lock nut adopts a left-handed thread, the extending direction of the locking branches coincides with a counterclockwise direction in the circumferential direction of the nut body when viewed axially towards the locking portion, so that the branches (22) can prevent the lock nut (2) from being deformed when the lock nut (2) abuts against the end side member (1).
2. Lock nut according to claim 1, characterized in that the lock branch (22) protrudes from an axial end face of the nut body (21).
3. Lock nut according to claim 1, characterized in that the end faces of the lock branches (22) on the axial end side are all plane and all lie in the same plane perpendicular to the axis (X).
4. The lock nut as claimed in claim 1, characterized in that a radially inner surface of the locking portion is designed as a circumferential surface, the radially inner surface has the same radial dimension as the center hole, and the internal thread is continuously provided in the locking portion and the center hole.
5. Lock nut according to claim 1, characterized in that the radially outer surface of the locking portion is designed as a circumferential surface and the radial dimension of the radially outer surface is smaller than the smallest radial dimension of the radially outer surface of the nut body (21).
6. Lock nut according to claim 1, characterized in that the lock branches (22) are distributed uniformly over the circumference of the nut body (21) at least in groups.
7. The lock nut as claimed in claim 6, characterized in that the lock branches (22) are uniformly distributed in the circumferential direction of the nut body (21).
8. Lock nut according to claim 1, characterized in that the locking part and the nut body (21) are made in one piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910757886.7A CN112392840B (en) | 2019-08-16 | 2019-08-16 | Lock nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910757886.7A CN112392840B (en) | 2019-08-16 | 2019-08-16 | Lock nut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112392840A CN112392840A (en) | 2021-02-23 |
| CN112392840B true CN112392840B (en) | 2024-10-01 |
Family
ID=74601990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910757886.7A Active CN112392840B (en) | 2019-08-16 | 2019-08-16 | Lock nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112392840B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202182100U (en) * | 2011-07-20 | 2012-04-04 | 河南航天精工制造有限公司 | Self-locking nut |
| CN203146547U (en) * | 2013-04-17 | 2013-08-21 | 江苏浩瀚汽车标准件有限公司 | Self-locked stop nut |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5302066A (en) * | 1993-01-19 | 1994-04-12 | Textron Inc. | Locking fastener |
| DE202010006200U1 (en) * | 2010-04-28 | 2010-08-05 | MÜLLER-PAUL, Dirk | Fastening element for lashing rails |
| CN104110433A (en) * | 2013-04-17 | 2014-10-22 | 江苏浩瀚汽车标准件有限公司 | Automatic locking anti-loosening nut |
| CN204664121U (en) * | 2015-03-26 | 2015-09-23 | 海盐县华昇汽车配件有限公司 | A kind of pressure point formula locking nut |
| CN207554534U (en) * | 2017-10-09 | 2018-06-29 | 恺霖卫浴科技（厦门）有限公司 | Subassembly of lock bolt |
| CN109595247B (en) * | 2019-01-25 | 2023-10-31 | 华侨大学 | Self-locking check bolt and installation method thereof |
| CN109899367A (en) * | 2019-04-17 | 2019-06-18 | 海盐宏茂五金制品有限公司 | A kind of anti-loosening fastening type flange nut |
-
2019
- 2019-08-16 CN CN201910757886.7A patent/CN112392840B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202182100U (en) * | 2011-07-20 | 2012-04-04 | 河南航天精工制造有限公司 | Self-locking nut |
| CN203146547U (en) * | 2013-04-17 | 2013-08-21 | 江苏浩瀚汽车标准件有限公司 | Self-locked stop nut |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112392840A (en) | 2021-02-23 |
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