CN112814987A - Locking nut - Google Patents

Abstract

The invention relates to a union nut, the union nut (2) can be leaned against the end side member (1) located on its axial end side, the union nut (2) includes the nut body (21), the nut body (21) has centre hole, there is internal thread in the centre hole, wherein, the union nut (2) includes at least two bulges (25) distributed evenly along circumference, wherein, the bulge (25) protrudes axially the axial end of the nut body (21) in order to lean against the said end side member (1), the union nut (2) also includes constructing the ditch groove (24) on both sides of circumference of the bulge (25), the ditch groove (24) begins the radial inside of the nut body (21) and extends axially from the said axial end respectively.

Description

Locking nut

Technical Field

The invention relates to a lock nut.

Background

The lock nut can be attached to a mating member such as a shaft or a bolt by its internal thread, and can be used to position and fix a member located on an 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 the 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 and impact.

A number of locking mechanisms for locking nuts are known from the prior art. One conventional lock nut includes a cylindrical nut body having a plurality of through holes extending from an outer peripheral surface to an inner peripheral surface in a circumferential direction of the nut body. When the locknut is assembled, after the nut body is screwed to 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 No. 201410553374.6 discloses a lock nut that utilizes the above locking mechanism.

However, the current lock nut has the following major problems: on the one hand, the lock nut may loosen after a period of operation. For example, can lead to spindle bearing failure, which can cause serious damage to the spindle system. Such failures occur frequently and the time cost and economic cost required for maintenance are high. On the other hand, the current lock nut often includes two or more mating components, and the locking effect is achieved through the matching between the mating components, so the processes of processing, assembling and the like are complicated.

Disclosure of Invention

Therefore, an object of the present invention is to provide a lock nut, which has a good anti-loosening effect, and is easy to assemble and low in cost.

This technical problem is solved by a lock nut which can be abutted against an end side member located on the axial end side thereof, the lock nut comprising a nut body having a central hole provided with an internal thread for cooperation with an external thread of a mating member.

According to the invention, the union nut comprises at least two projections distributed uniformly in the circumferential direction, wherein the projections project axially beyond the axial end face of the nut body, i.e. the axial end face which faces the end side part after assembly, for abutting against the end side part. Furthermore, the union nut comprises grooves formed on both sides of the projection in the circumferential direction, wherein the grooves each extend in the axial direction from the axial end face on the radially inner side of the nut body.

In other words, an abutment for abutment against the end face piece and non-abutment portions arranged on both sides in the circumferential direction of the abutment are formed on the union nut by a projection projecting from the axial end face of the nut body, wherein the abutment and the non-abutment portions are spaced apart in the circumferential direction by a groove formed on the radially inner side of the nut body, wherein the abutment is provided with a projection projecting from the axial end face of the nut body, in particular, from the radially inner region of the axial end face. Here, the structural units consisting of the abutment portions and the non-abutment portions on both sides in the circumferential direction thereof are arranged uniformly in the circumferential direction of the lock nut. When the projection abuts against the end side member, the abutting portion and the non-abutting portion can be deformed to different degrees, so that the internal threads on the abutting portion and the non-abutting portion can be relatively shifted, particularly in the axial direction, thereby preventing the lock nut from loosening. In addition, the locking nut is a single piece, so that the locking nut is beneficial to simplifying the working procedures particularly in the aspect of assembly and saving the cost.

In the context of the present invention, the terms "radial", "axial" and "circumferential" are based on the central axis of the union nut, unless otherwise stated.

The present invention does not limit the shape of the lock nut on the radially outer side. For example, the union nut or the nut body as a whole can be polygonal, in particular regular polygonal, in particular circular.

In the context of the invention, the mating element can be a component, such as a shaft or a bolt, which has an external thread at least in some regions for mating with an internal thread of the union nut. The engaging member may be stationary in the operative condition, or may be movable in a rotational or other manner.

In the context of the invention, the end face piece is located on the axial end face of the union nut and should be able to abut against the union nut in the completely assembled state. The end side pieces can be arranged on the mating piece or can also be part of the mating piece. Alternatively, the end face piece can also be a separate component from the counterpart and not connected to the counterpart.

In an advantageous embodiment, the grooves are distributed uniformly over the circumference of the union nut. In this case, the structure of the abutment and the non-abutment in the radial plane may be configured substantially identically. The lock nut can thereby be more uniformly configured in the circumferential direction, for example, the mass can be distributed uniformly, which is advantageous for the use of the lock nut on spindles rotating at high speeds.

In a preferred embodiment, the groove may extend axially through the lock nut. In this case, the lock nut is easy to manufacture and material can be saved.

Alternatively, the groove may also extend only over a partial axial section of the nut body. In this case, the groove penetrates through the axial end face that faces the end side member after assembly, and does not penetrate through the axial end face that faces away from the end side member after assembly. At this time, the lock nut and the mating member have more thread contact area.

In a preferred embodiment, the grooves are substantially triangular or trapezoidal in cross-section in the radial direction. Thereby facilitating the fabrication of the trench.

In a preferred embodiment, the axial end faces of the projections extend in the same radial plane. That is to say, the axial end faces of the individual projections, i.e. the contact faces for abutment on the end-side part, each extend perpendicular to the central axis of the union nut, but also in the same plane. Thereby, the lock nut or the projection can smoothly abut against, for example, an end side member of the spindle bearing, whereby an axial load can be smoothly applied to the spindle bearing.

The axial length of the projection is advantageously 1 to 2 thread pitches here. Thereby advantageously combining the axial dimension of the lock nut with the locking effect. Here, the axial length refers to an axial distance between an axial end surface of the projection and an axial end surface of the nut main body on which the projection is provided. The pitch corresponds here to the pitch of the internal thread of the union nut.

In a preferred embodiment, the projection is made in one piece with the nut body.

In this case, the cross section of the projection in the radial direction is advantageously a circular arc segment. This is particularly advantageous for simplifying the machining of the projection.

In this case, the radial inner side of the projection is advantageously provided with an internal thread. That is, the distance of the radially inner surface of the projection from the central axis of the lock nut coincides with the radius of the central bore of the nut body, and in this case, the projection and the nut body have a coincident internal thread. The relative offset of the internal threads in different regions after assembly can be enhanced, and the locking effect of the locking nut is optimized.

Alternatively, the lug and the nut body can also be manufactured separately and connected to each other in a subsequent step to form a single piece. Thereby facilitating simplification of the process, particularly in terms of assembly, and cost saving.

Drawings

Preferred embodiments of the present invention are schematically illustrated in the following with reference to the accompanying drawings. The attached drawings are as follows:

figure 1 is a partial side view of a spindle system with a lock nut according to a preferred embodiment of the invention,

figure 2 is a front view of the lock nut according to figure 1,

fig. 3 is a side view of the lock nut according to fig. 1, an

Fig. 4 is a partial perspective view of a lock nut according to another preferred embodiment.

In the various figures, identical or functionally identical components are provided with the same reference symbols.

Detailed Description

Fig. 1 shows a partial side view of a spindle system with a lock nut 2 according to a preferred embodiment of the invention. The locking nut 2 is connected with the main shaft 3 through threads. The lock nut 2 abuts on the spindle bearing 1 at the axial end side thereof to apply an appropriate axial load to the spindle bearing 1.

Fig. 2 and 3 show a front view and a side view, respectively, of the lock nut according to fig. 1, and fig. 4 is a partial perspective view of another embodiment of the lock nut constructed in accordance with the embodiment similar to fig. 1 to 3.

The common features of both embodiments will be described first.

As can be seen in connection with fig. 2, 3 and 4, the lock nut 2 has a nut body 21 which is annular in its entirety. An abutment 22 and a non-abutment 23 are formed on the union nut 2, wherein the abutment 22 and the non-abutment 23 are spaced apart in the circumferential direction by a groove 24 formed on the radially inner side of the nut body 21, wherein the abutment 22 is provided with a projection 25 projecting from an axial end face of the nut body 21. In the present exemplary embodiment, the union nut 2 or the nut body 21 and the projection 25 are produced in one piece.

As shown in fig. 2, in the present embodiment, the abutting portions 22 and the non-abutting portions 23 are alternately and uniformly distributed in the circumferential direction of the lock nut 2. In this case, the grooves 24 are evenly distributed in the circumferential direction of the lock nut 2. Whereby the lock nut 2 has a uniform circumferential structure.

As shown in fig. 2 and 4, in the present embodiment, the grooves 24 penetrate the lock nut 2 in the axial direction and the grooves 24 have a substantially triangular radial cross section, respectively. This embodiment is particularly advantageous for the simple and cost-effective production of the groove 24 in the production of the union nut.

As shown in fig. 2, 3 and 4, the axial end surface of each projection 25 is configured as a flat surface extending in the radial direction, and each projection 25 has the same axial dimension, whereby the lock nut can smoothly abut on the spindle bearing, thereby smoothly applying an axial load to the spindle bearing. Here, the axial end face of the projecting portion 25 is preferably 1 to 2 pitches from the axial end face of the nut main body 21.

As shown in particular in fig. 2 and 4, the projection 25 is configured as a circular arc section, which matches the partial structure of the nut body 21 with the groove 24. In other embodiments, the projections may be different from a partial structure of the nut main body 21. Further, the radially inner side of the projecting portion 25 is located at a distance from the central axis of the lock nut 2 corresponding to the radius of the central hole of the nut main body 21, and an internal thread (not shown) for mating with the external thread of the main shaft 3 (see fig. 1) is continuously provided in the radially inner side surface of the projecting portion 25 and the central hole of the nut main body 21. The term "continuous" as used herein does not take into account the thread interruption caused by the groove 24.

The differences between the two embodiments shown in fig. 2 and 3 and in fig. 4 are described below. In the embodiment illustrated in fig. 2 and 3, the radially outer surface of the projection 25 has the same radial dimension as the groove base of the groove 24. In the embodiment shown in fig. 4, the radially outer surface of the projection 25 is closer to the center axis of the union nut 2 than the groove bottom of the groove 24. In both embodiments, the location of the action of the axial force exerted by the end-piece 1 (see fig. 1) is advantageously optimized, which facilitates a relative offset, in particular an axial relative offset, of the internal thread on the abutment 22 and the internal thread on the non-abutment 23, thereby preventing the lock nut from loosening.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. 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. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

1 end side part, main shaft bearing

2 locking nut

21 nut body

22 abutting part

23 non-abutting part

24 groove

25 projection

3 mating part, spindle

Claims (10)

1. Lock nut, the lock nut (2) being capable of abutting on an end side member (1) located on an axial end side thereof, the lock nut (2) comprising a nut body (21), the nut body (21) having a central bore in which an internal thread is provided, characterized in that,

the locking nut (2) comprises at least two bulges (25) which are uniformly distributed along the circumferential direction, wherein the bulges (25) axially protrude out of the axial end surface of the nut main body (21) and are used for abutting against the end side piece (1),

the union nut (2) further comprises grooves (24) formed on both sides of the projection (25) in the circumferential direction, wherein the grooves (24) each extend in the axial direction from the axial end face on the radially inner side of the nut body (21).

2. Lock nut according to claim 1, characterized in that the grooves (24) are evenly distributed in the circumferential direction of the lock nut (2).

3. Lock nut according to claim 1, characterized in that the groove (24) extends axially through the lock nut (2).

4. Lock nut according to claim 1, characterized in that the groove (24) extends over a partial axial section of the nut body (21).

5. Lock nut according to claim 1, characterized in that the cross section of the groove (24) in the radial direction is substantially triangular or trapezoidal.

6. Lock nut according to claim 1, characterized in that the axial end faces of the protrusions (25) extend in the same radial plane.

7. Lock nut according to claim 6, characterized in that the axial length of the protrusions (25) is 1 to 2 thread pitches.

8. Lock nut according to claim 1, characterized in that the protrusion (25) is made in one piece with the nut body (21).

9. The lock nut as claimed in claim 8, characterized in that said projection (25) is a circular arc segment in cross section in the radial direction.

10. The lock nut as claimed in claim 9, characterized in that a radially inner side of the projection (25) is configured with the internal thread.

Images