Locking nut and method for manufacturing and assembling a locking nut

Abstract

The invention relates to a lock nut and to a method for manufacturing and assembling a lock nut. The lock nut (10) is screwable at a mating member (30) and has a central bore, wherein the central bore has a first inner threaded region (11) and a second inner threaded region (12) arranged axially spaced apart, wherein the inner thread of the first inner threaded region (11) and the inner thread of the second inner threaded region (12) have the same pitch, wherein the axial distance between any thread tooth in the first inner threaded region (11) and any thread tooth in the second inner threaded region (12) is greater in a free state of the lock nut than in a state of the lock nut assembled at the mating member (30). The method for manufacturing and assembling a lock nut comprises carrying out the respective manufacturing or assembly steps by means of an auxiliary bore (14) configured at the lock nut preform or at the lock nut finished product.

Description

TECHNICAL FIELD

[0001] The present application relates to a lock nut. Accordingly, the present application also relates to a method for manufacturing and assembling a lock nut. BACKGROUND

[0002] Lock nuts can be mounted to a cooperating member such as a shaft or a bolt by means of their inner thread and can position and secure a component located at the end side of the lock nut. For example, a lock nut can be mounted on a main shaft, and the locking torque of the lock nut provides an axial load to the main shaft bearing to maintain the proper play of the main shaft bearing. The lock nut is provided with a locking anti-loosening mechanism so that the lock nut does not loosen even in harsh working conditions with vibration, impact, etc.

[0003] Various locking mechanisms of lock nuts are known from the prior art. For example, Chinese patent application document CN104564990A discloses a lock nut having a nut body in the shape of a cylinder, a plurality of through holes being provided in the circumferential direction of the nut body from the outer circumferential surface to the inner circumferential surface. When assembling the lock nut, after the nut body is screwed onto the outer thread of the rotating shaft, a clamping screw is screwed into the through hole, and the clamping screw bites into the outer threaded portion of the rotating shaft, thereby preventing loosening of the nut.

[0004] However, the current lock nuts have the following main problems: On the one hand, the lock nut will loosen after a period of work. For example, it can cause the main shaft bearing to fail, which causes serious damage to the main shaft system. Such a failure occurs frequently, and the time cost and economic cost required for maintenance are both high. On the other hand, the current lock nut often includes two or more matched components, and the locking effect is achieved by cooperation between these matched components, so the product manufacturing cost and transportation cost are high. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a lock nut which has good anti-loosening effect and is low in cost.

[0006] The above technical problem can be solved by a lock nut. The lock nut can be screwed on a cooperating member and has a central hole, wherein the central hole has a first inner threaded region and a second inner threaded region arranged axially spaced apart, wherein the inner thread of the first inner threaded region and the inner thread of the second inner threaded region have the same pitch, and wherein the axial distance between any thread tooth in the first inner threaded region and any thread tooth in the second inner threaded region is greater in a free state of the lock nut than in a state in which the lock nut is assembled to the cooperating member.

[0007] In the context of the present document, the shape of the lock nut on the radially outer side is not limited. For example, the lock nut can have a polygonal, in particular a regular polygonal, in particular a circular, radial cross section as a whole.

[0008] In the context of the present document, the central bore of the lock nut is in particular configured as a cylindrical through-hole, which penetrates both axial end faces, i.e. the first axial end face and the second axial end face, of the lock nut.

[0009] In the context of the present document, the terms "radial", "axial" and "circumferential" are thus based on the central axis of the central bore of the lock nut, unless otherwise stated.

[0010] In the context of the present document, the lock nut can be screwed by means of the internal thread of the first internal thread region and the second internal thread region on a mating member, in particular can be used to abut against an end-side member located on the axial end side thereof.

[0011] Here, the mating member can be a component, for example a shaft or a bolt, which has at least in sections an external thread for cooperating with the internal thread of the first internal thread region and the second internal thread region of the lock nut. The mating member can be stationary in the working state, or can be in rotational or other forms of motion.

[0012] Here, the end-side member is located on the axial end side of the lock nut and should be able to abut against one axial end face, for example the first axial end face, of the lock nut in the completed assembled state. The end-side member can be mounted on the mating member, or can also be an integral component of the mating member. Alternatively, the end-side member can also be a component independent of and not connected to the mating member. For example, the end-side member can be a bearing or a washer on a shaft.

[0013] In the context of the present document, advantageously, the first internal thread region of the lock nut is arranged axially on the side, in particular the first axial end face side, which is closer to the end-side member after completion of the assembly, and the second internal thread region of the lock nut is arranged axially on the side, in particular the second axial end face side, which is further away from the end-side member after completion of the assembly.

[0014] Here, the internal thread of the first internal thread region and the internal thread of the second internal thread region can be configured identically or similarly and have the same thread pitch and thread count, so that the lock nut can be screwed onto the external thread in the external thread region of the mating member.

[0015] In the lock nut provided herein, the axial distance between any thread of the first internal thread region and any thread of the second internal thread region, in particular between the respective positions, is greater in the free state of the lock nut than in the state in which the lock nut is fitted to the mating member. Here, the threads in the two internal thread regions mean the thread forms shown in each of the two thread regions, in particular in an axial section of the lock nut, which can consist of the same thread from a single thread or a multi-thread, or can consist of different threads from a multi-thread. Here, the respective positions of the two threads are, for example, the axial distance between the two points on the respective median line corresponding to the two threads.

[0016] With this design, after the lock nut is fitted to the mating member, the internal thread in the first thread region of the lock nut can be screwed onto the external thread of the mating member as a conventional internal thread, whereby the lock nut can be pressed against the end-side member with a predetermined axial force via the first axial end face, in particular a first axial end face perpendicular to the central axis of the lock nut; at the same time, the internal thread in the second thread region of the lock nut is screwed onto the external thread of the mating member and is pressed against the thread face of the external thread of the mating member at the thread face on the axial side, in particular close to the second axial end face, with a greater pressing force than in the first thread region, whereby the lock nut can be locked at the mating member, thus achieving a good anti-loosening function of the lock nut.

[0017] In an advantageous embodiment, the first internal thread region and the second thread region are spaced apart from each other by an annular groove extending radially outward from the central bore. This allows the annular material portion of the lock nut, which is axially from the annular groove to the second axial end face and radially in particular close to the central bore, to be deformed or offset as a whole in the axial direction. In other words, this allows the annular material portion of the lock nut preform, which is to be provided with the second internal thread region, or the already existing second internal thread region of the lock nut finished product, to be offset towards the soon-to-be-provided or already existing first internal thread region, thus facilitating the manufacture and assembly of the lock nut lock.

[0018] Here, advantageously, during the manufacture of the lock nut, a lock nut preform can first be provided with a central bore and an annular groove, and the annular material portion of the lock nut preform, which is axially from the annular groove to the second axial end face and radially in particular close to the central bore, is offset as a whole towards the annular groove; then, the internal thread is manufactured at the central bore; finally, the above-mentioned annular material portion is released so that it is returned in the axial direction.

[0019] Here, advantageously, during the assembly of the lock nut, the lock nut having the central bore and the annular groove can be provided first, and the annular material portion of the lock nut axially from the annular groove to the second axial end face, radially particularly close to the central bore, is integrally offset toward the annular groove; then the lock nut is screwed to the mating member; finally, the above-mentioned annular material portion is released so that it is axially returned, so that the internal thread in the second threaded region can be particularly tightly compressed at the external thread of the mating member, achieving a good anti-loosening function.

[0020] In a preferred embodiment, the lock nut further has an auxiliary hole configured to intersect the annular groove, the auxiliary hole comprising a first auxiliary hole section and a second auxiliary hole section distributed axially, wherein the first auxiliary hole section is configured with an internal thread, and the inner diameter of the second auxiliary hole section is greater than or equal to the bottom diameter of the first auxiliary hole section, wherein the first auxiliary hole section is completely arranged on one axial side of the annular groove, and the second auxiliary hole section extends from the end of the first auxiliary hole section close to the annular groove to the axial end face of the lock nut.

[0021] Here, the internal thread in the first auxiliary hole section matches the external thread of an auxiliary member, such as a bolt, used for manufacturing and / or assembling the lock nut. The inner diameter of the second auxiliary hole section is greater than or equal to the bottom diameter of the first auxiliary hole section, i.e. the major diameter of the internal thread in the first auxiliary hole section, so that the external thread section of the auxiliary member, such as the shank of the bolt, can extend through the second auxiliary hole section without interference from the second axial end face of the lock nut preform or finished product. Here, in an embodiment, the first auxiliary hole section and the second auxiliary hole section can be separated by the annular groove. Alternatively, the second auxiliary hole section is distributed on both axial sides of the annular groove. In this way, the external thread at the external thread section of the auxiliary member, such as the shank of the bolt, can be screwed into the internal thread in the first auxiliary hole section from one side of the second axial end face until the stop section of the auxiliary member, such as the head of the bolt, abuts against the second axial end face of the lock nut preform or finished product and deforms the second axial end face toward the annular groove, i.e. deforms or offsets the above-mentioned annular material portion toward the annular groove of the lock nut, thereby implementing the manufacturing step or assembly step of the lock nut. In this case, the lock nut itself is configured as a separate part, which is low in cost and easy to transport. Furthermore, since the auxiliary member, such as the bolt, itself is very low in cost and can be reused during the manufacturing and / or assembly of the lock nut, the manufacturing cost of the lock nut can be further reduced.

[0022] Particularly advantageously, the auxiliary hole extends parallel to the central axis of the central bore. This facilitates the manufacturing and processing of the auxiliary hole, and facilitates the deformation of the above-mentioned annular material portion toward the annular groove of the lock nut by means of the auxiliary member.

[0023] Particularly advantageously, the auxiliary hole is configured as a through hole. In this case, the end of the first auxiliary hole section, which is remote from the annular groove, extends to the first axial end face of the lock nut. This facilitates the manufacture and machining of the auxiliary hole.

[0024] Particularly advantageously, the annular groove extends radially outward beyond the auxiliary hole, in particular the second auxiliary hole section. Thereby, the deformation or offset of the above-mentioned annular material portion in axial direction can advantageously be increased.

[0025] Particularly advantageously, the lock nut has at least two auxiliary holes distributed in the circumferential direction. Preferably, four, six or eight auxiliary holes are arranged in the circumferential direction. Preferably, the at least two auxiliary holes are evenly distributed in the circumferential direction of the lock nut, thereby facilitating the dynamic balancing of the lock nut.

[0026] Correspondingly, a manufacturing method for manufacturing a lock nut, in particular by means of an auxiliary hole, is proposed, wherein the manufacturing method comprises the following steps:

[0027] a1) providing a lock nut preform having a central hole, an annular groove and an auxiliary hole, wherein the annular groove extends radially outward from the central hole, the auxiliary hole is configured intersecting, in particular perpendicularly to, the annular groove, wherein the auxiliary hole comprises a first auxiliary hole section and a second auxiliary hole section distributed in axial direction, wherein the first auxiliary hole section is configured with an internal thread, and the inner diameter of the second auxiliary hole section is greater than or equal to the bottom diameter of the first auxiliary hole section, wherein the first auxiliary hole section is arranged completely on one axial side of the annular groove, and the second auxiliary hole section extends from the end of the first auxiliary hole section, which is close to the annular groove, to the axial end face of the lock nut preform;

[0028] b1) providing a bolt, and passing the shank of the bolt through the second auxiliary hole section of the lock nut preform provided by step a) and screwing into the first auxiliary hole section until the head of the bolt abuts against the axial end face of the lock nut preform and deforms the axial end face towards the annular groove;

[0029] c1) machining an internal thread in the central hole of the lock nut preform resulting from step b1);

[0030] d1) after step c1), removing the bolt from the lock nut preform to obtain a lock nut finished product.

[0031] Thereby, a lock nut can be simply manufactured by means of an auxiliary hole and a bolt. It is noted here that although the annular groove is described with reference to the central hole in step a1) and the auxiliary hole is described with reference to the annular groove, this only defines the relative position relationship of the central hole, the annular groove and the auxiliary hole of the lock nut preform, and does not define the manufacturing and machining sequence of the central hole, the annular groove and the auxiliary hole.

[0032] It is particularly preferred that the above manufacturing method further comprises the steps of:

[0033] e1 ) before step c1 ), arranging a ring-shaped stopper in the annular groove, wherein the ring-shaped stopper is located radially inside the locking nut preform with respect to the auxiliary hole;

[0034] f1 ) after step c1 ), removing the ring-shaped stopper from the annular groove.

[0035] Here, the ring-shaped stopper is, for example, a washer, in particular a plastic washer, which can prevent the above-mentioned annular material portion of the locking nut from being excessively deflected towards the annular groove, so that the pressing force of the internal thread in the second threaded region of the locking nut against the external thread of the mating component can be controlled in a predetermined range.

[0036] Correspondingly, it is also proposed here a method for assembling a locking nut, in particular by means of an auxiliary hole, wherein the method comprises the steps of:

[0037] a2) providing a locking nut, which has, in particular, an auxiliary hole;

[0038] b2) providing a bolt and passing the shank of the bolt through the second auxiliary hole section of the locking nut provided by step a2) and screwing it into the first auxiliary hole section until the head of the bolt abuts against the axial end face of the locking nut and deforms the axial end face towards the annular groove;

[0039] c2) assembling or screwing the locking nut obtained by step b2) to the mating component;

[0040] d2) after step c2), removing the bolt from the locking nut.

[0041] In this way, the locking nut can be simply assembled by means of the auxiliary hole and the bolt. Here, since the bolt used during assembly can be a standard part, it can be provided by the assembly plant or workshop of the locking nut, so that only the transportation of the locking nut is required during the transportation of the parts, so that the transportation of the parts can be more convenient and the cost can be more economical.

[0042] Alternatively to the manufacturing and assembly by means of the auxiliary hole, in another possible solution, the locking nut preform or the finished locking nut can also be clamped from both axial sides by means of another auxiliary tool, so that the above-mentioned annular material portion of the locking nut preform or the finished locking nut is deflected towards the annular groove, so that the corresponding manufacturing steps or assembly steps can be carried out accordingly. BRIEF DESCRIPTION OF DRAWINGS

[0043] A preferred embodiment of the present application will be described below with reference to the accompanying drawings. The drawings are as follows:

[0044] Figure 1is a schematic assembly cross-section of a locking nut according to a preferred embodiment,

[0045] Figure 2 is a schematic assembly cross-section of a locking nut according to a preferred embodiment, Figure 1 is a schematic assembly cross-section of a locking nut according to a preferred embodiment, and

[0046] Figure 3 is a schematic assembly cross-section of a locking nut according to a preferred embodiment, Figure 1 is a schematic assembly cross-section of a locking nut according to a preferred embodiment. DETAILED DESCRIPTION

[0047] Figure 1 is a schematic assembly cross-section of a locking nut 10 according to a preferred embodiment. The locking nut 10 is used here for a spindle system in a machine tool. The locking nut 10 is screwed at a spindle 30 and can abut, by means of its first axial end face 15, against a spindle bearing (not shown) located at the axial end side of the locking nut 10, in order to maintain the appropriate play of the spindle bearing.

[0048] As shown in Figure 1 , the locking nut 10 has a central bore, wherein the central bore has a first inner threaded region 11 and a second inner threaded region 12 arranged spaced apart in the axial direction by an annular groove 13. The inner thread of the first inner threaded region 11 and the inner thread of the second inner threaded region 12 can be configured identically or similarly and have the same thread pitch and thread number, so that the locking nut 10 can be screwed at the outer thread in the outer threaded region 31 of the spindle 30. Here, the axial distance between any thread tooth in the first inner threaded region 11 and any thread tooth in the second inner threaded region 12 is greater in the free state of the locking nut 10 than in the state in which the locking nut 10 is assembled to the spindle 30. As a result, the inner thread in the first threaded region 11 of the locking nut 10 can be screwed like a conventional inner thread to the outer thread in the outer threaded region 31 of the spindle 30, whereby the locking nut 10 can be pressed with a predetermined axial force against the spindle bearing by means of the first axial end face 15 perpendicular to the central axis of the locking nut 10. At the same time, the inner thread in the second threaded region 12 of the locking nut 10 is screwed to the outer thread in the outer threaded region 31 of the spindle 30 and is pressed against the thread tooth face of the outer thread of the spindle 30 at the second axial end face 16 with a greater pressing force than in the middle of the first threaded region 11, whereby a good anti-rotation function of the locking nut 10 can be achieved.

[0049] In order to achieve the manufacture and assembly of the locking nut 10, four or six auxiliary holes 14 are advantageously configured in the locking nut 10 in the present embodiment, which are distributed uniformly in the circumferential direction. As shown in Figure 1As shown, the auxiliary hole 14 is configured as an axial through hole which penetrates the first axial end face 15 and the second axial end face 16 of the lock nut 10. Here, the auxiliary hole 14 is arranged perpendicularly to the annular groove 13. The annular groove 13 extends radially outward beyond the auxiliary hole 14.

[0050] The auxiliary hole 14 comprises a first auxiliary hole section 141 and a second auxiliary hole section 142 which are distributed axially. The first auxiliary hole section 141 is arranged completely on the axial side of the annular groove 13 close to the first axial end face 15. The end of the first auxiliary hole section 141 which is away from the annular groove 13 is configured at the first axial end face 15 of the lock nut 10. The end of the first auxiliary hole section 141 which is close to the annular groove 13 is connected to the second auxiliary hole section 142. Here, the second auxiliary hole section 142 extends from the end of the first auxiliary hole section 141 to the second axial end face 16 of the lock nut 10. In the present embodiment, the second auxiliary hole section 142 is distributed on both axial sides of the annular groove 13. The first auxiliary hole section 141 is configured with an internal thread, and the inner diameter of the second auxiliary hole section 142 is greater than or equal to the bottom diameter of the first auxiliary hole section 141.

[0051] Correspondingly, in a manufacturing method for manufacturing the lock nut 10 by means of the auxiliary hole 14, the following steps are included:

[0052] a1) providing a lock nut preform which has a central hole, an annular groove 13 and four or six auxiliary holes 14 which are distributed circumferentially, wherein the annular groove 13 extends radially outward from the central hole and beyond the auxiliary holes 14, the auxiliary holes 14 are configured perpendicularly to the annular groove 13, wherein the auxiliary holes 14 comprise a first auxiliary hole section 141 and a second auxiliary hole section 142 which are distributed axially, wherein the first auxiliary hole section 141 is configured with an internal thread, and the inner diameter of the second auxiliary hole section 142 is greater than or equal to the bottom diameter of the first auxiliary hole section 141, wherein the first auxiliary hole section 141 is arranged completely on one axial side of the annular groove 13, and the second auxiliary hole section 142 extends from the end of the first auxiliary hole section 141 which is close to the annular groove 13 to the axial end face 16 of the lock nut preform;

[0053] b1) providing four or six bolts 20, and correspondingly threading the shanks of the bolts 20 through the second auxiliary hole sections 142 of the lock nut preform provided by step a) and screwing them into the first auxiliary hole sections 141 until the heads of the bolts 20 abut against the second axial end face 16 of the lock nut preform and deform or displace the second axial end face 16 towards the annular groove 13 (the second axial end face 16 in the dashed line in Figure 2

[0054] ​e1) Before or after step b1), an annular stop 40 in the form of a plastic washer is arranged in the annular groove 13, wherein the annular stop 40 is located radially inside the locking nut preform relative to the auxiliary hole 14.

[0055] c1) Then, as Figure 2 As shown, the internal threads in the first internal thread region 11 and the second internal thread region 12 are machined at the center hole of the locking nut preform obtained in the previous step, i.e., step b1) or step e1.

[0056] d1) Then, that is, after step c1), remove all bolts 20 from the lock nut prefabrication;

[0057] f1) After step c1) and before or after step d1), remove the annular stop 40 from the annular groove 13.

[0058] By following the above steps, the finished lock nut 10 can be obtained.

[0059] Accordingly, an assembly method for assembling a lock nut 10 using an auxiliary hole 14 includes the following steps:

[0060] a2) Provide 10 finished locknuts as described above;

[0061] b2) Provide bolts 20 corresponding to the number of auxiliary holes 14, and accordingly make the studs of the bolts 20 pass through the second auxiliary hole section 142 of the locking nut finished product 10 provided in step a2) and screw them into the first auxiliary hole section 141, until the bolt head of the bolt 20 abuts against the second axial end face 16 of the locking nut finished product 10 and deforms or shifts the second axial end face 16 toward the annular groove 13. Figure 3 The dashed line in the figure shows the second axial end face 16 when it is undeformed or unoffset;

[0062] c2) such as Figure 3 As shown, the locking nut 10 obtained in step b2) is assembled or screwed onto the main shaft 30;

[0063] d2) After step c2), remove all bolts 20 from the lock nut 10.

[0064] In the present embodiment, the lock nut 10 is configured as a separate part itself, which is cost-effective and easy to transport. Furthermore, the manufacturing costs of the lock nut 20 can be further reduced, since the components used for the auxiliary manufacturing and / or assembly, i.e. the bolts 20, are very cost-effective themselves and can be reused during the manufacturing and / or assembly of the lock nut 10. Furthermore, the bolts 20 can be standard parts, which can be provided by the assembly plant or workshop of the lock nut, whereby it is not necessary to transport the bolts during the transportation of the parts, in other words, only the transportation of the lock nut has to be realized, so that the transportation of the parts can be made easier and cost-effectively.

[0065] Although the possible embodiments have been described in the above description, it is not the intention of the Applicant to limit the scope of the present application to those embodiments. The scope of the present application is limited only by the claims and equivalents thereof. Numerous variations on the embodiments described herein will be readily apparent to those skilled in the art and the general principles defined herein can be applied to other embodiments without departing from the scope of the application. Therefore, the present application is not to be restricted to the embodiments disclosed in this description, but is to be accorded the full scope that the law permits and several future changes in the technical field that will come with time.

[0066] List of reference signs

[0067] 10 lock nut

[0068] 11 first internally threaded region

[0069] 12 second internally threaded region

[0070] 13 annular groove

[0071] 14 auxiliary hole, axial hole

[0072] 141 first auxiliary hole section, first axial hole section

[0073] 142 second auxiliary hole section, second axial hole section

[0074] 15 first axial end face

[0075] 16 second axial end face

[0076] 20 bolt

[0077] 30 mating component

[0078] 31 externally threaded region

[0079] 40 annular stop; spacer

Claims

1. Lock nut (10) which can be screwed at a mating member (30) and has a central hole, characterized in that The central bore has a first internally threaded region (11) and a second internally threaded region (12) arranged axially spaced apart, wherein the internal thread of the first internally threaded region (11) and the internal thread of the second internally threaded region (12) have the same pitch, wherein the axial distance between any thread tooth in the first internally threaded region (11) and any thread tooth in the second internally threaded region (12) is greater in the free state of the lock nut than in the state in which the lock nut is fitted to the mating member (30) and the auxiliary member is removed.

2. Locking nut (10) according to claim 1, characterized in that The first internally threaded region (11) and the second threaded region (12) are spaced apart from each other by an annular groove (13) which extends radially outward from the central bore.

3. The lock nut (10) according to claim 2, characterized in that The lock nut (10) also has an auxiliary bore (14) configured intersecting the annular groove (13), the auxiliary bore (14) comprising a first auxiliary bore section (141) and a second auxiliary bore section (142) distributed axially, wherein the first auxiliary bore section (141) is configured with an internal thread, and the internal diameter of the second auxiliary bore section (142) is greater than or equal to the bottom diameter of the first auxiliary bore section (141), wherein the first auxiliary bore section (141) is arranged entirely on one axial side of the annular groove (13), and the second auxiliary bore section (142) extends from the end of the first auxiliary bore section (141) close to the annular groove (13) to the axial end face (16) of the lock nut (10).

4. The lock nut (10) according to claim 3, characterized in that The auxiliary bore (14) extends parallel to the central axis of the central bore.

5. The lock nut (10) according to claim 3, characterized in that The auxiliary bore (14) is configured as a through-hole.

6. The lock nut (10) according to claim 3, characterized in that The annular groove (13) extends radially outward beyond the auxiliary bore (14).

7. A lock nut (10) according to any one of claims 3 to 6, characterized in that The lock nut (10) has at least two auxiliary bores (14) distributed circumferentially.

8. Manufacturing method for manufacturing a lock nut (10) according to any one of claims 1 to 7, characterized in that, The manufacturing method comprises the steps of: a1) providing a lock nut preform, the lock nut preform having - a central bore; - an annular groove (13) extending radially outward from the central bore; - an auxiliary bore (14) configured intersecting the annular groove (13), wherein the auxiliary bore (14) comprises a first auxiliary bore section (141) and a second auxiliary bore section (142) distributed axially, wherein the first auxiliary bore section (141) is configured with an internal thread, and the internal diameter of the second auxiliary bore section (142) is greater than or equal to the bottom diameter of the first auxiliary bore section (141), wherein the first auxiliary bore section (141) is arranged entirely on one axial side of the annular groove (13), and the second auxiliary bore section (142) extends from the end of the first auxiliary bore section (141) close to the annular groove (13) to the axial end face (16) of the lock nut preform. b1 ) providing a bolt (20) and passing the shank of the bolt (20) through the second auxiliary hole section (142) of the lock nut preform provided by step a) and screwing into the first auxiliary hole section (141 ) until the head of the bolt (20) abuts against the axial end face (16) of the lock nut preform and deforms the axial end face (16) towards the annular groove (13); c1 ) machining an internal thread at the central hole of the lock nut preform resulting from step b1 ); d1 ) after step c1 ), removing the bolt (20) from the lock nut preform to obtain the lock nut (10).

9. The production method according to claim 8, wherein The manufacturing method comprises the steps of: e1 ) before step c1 ), arranging an annular stopper (40) in the annular groove (13), wherein the annular stopper (40) is located radially inside the auxiliary hole (14) with respect to the lock nut preform; f1 ) after step c1 ), removing the annular stopper (40) from the annular groove (13).

10. Method for assembling a lock nut (10) according to any one of claims 3 to 7, characterized in that, The assembly method comprises the steps of: a2) providing the lock nut (10); b2) providing a bolt (20) and passing the shank of the bolt (20) through the second auxiliary hole section (142) of the lock nut (10) provided by step a2) and screwing into the first auxiliary hole section (141 ) until the head of the bolt (20) abuts against the axial end face (16) of the lock nut (10) and deforms the axial end face (16) towards the annular groove (13); c2) assembling the lock nut (10) resulting from step b2) to a mating member; d2) after step c2), removing the bolt (20) from the lock nut (10).

Images