Round nut locking mechanism and assembling method thereof

Abstract

The invention relates to the technical field of mechanical assembly, in particular to a round nut locking mechanism and an assembly method.The round nut is used for being installed on the threaded connection portion of a connected piece, a plurality of clamping grooves are formed in the threaded connection portion of the connected piece, and a convex ring is arranged on the end face of one side of the round nut; when the round nut is installed on the threaded connection portion of a connected piece, the protruding ring is arranged on the outer side of the clamping groove in a sleeved mode, and part of the protruding ring can be knocked into the clamping groove. The invention has the advantages that as long as the pre-tightening is reasonable and meets the clearance requirement, the thin edge of the nut is knocked into the shaft head chute and the rotation of the nut is limited, the clearance of the round nut can be more accurately adjusted without dead angle limitation, the whole locking and positioning process is convenient and quick, the requirement on the machining precision of parts is reduced, and the use of stop washers can be reduced; the phenomena of wrong assembly and neglected assembly in the assembly process are avoided, and the assembly quality is effectively controlled.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical assembly, and in particular to a round nut locking mechanism and an assembly method thereof. Background Art

[0002] In the assembly process of shaft parts, accurate clearance adjustment and reliable axial positioning are key factors to ensure the normal operation of the equipment. Traditionally, in order to achieve these requirements, retaining ring positioning or round nut locking positioning methods are usually adopted. For example, a thread safety groove is milled in the center of the threaded part of the shaft head, and a retaining washer and a round nut are assembled. The locking is completed by driving the retaining plate on the retaining washer into the retaining groove on the round nut. Although this method can meet certain positioning requirements, it has direction and clearance requirements. It is not convenient enough in the assembly of complex parts, especially in situations where the end face clearance requirements are extremely high.

[0003] For example, patent CN109114092B proposes an anti-loosening and anti-retraction nut, which achieves locking by arranging multiple washers between the nut and the connected part, and the stop plates on the washers are embedded in each other. Although the locking effect is excellent, the processing accuracy requirements are high and the assembly is cumbersome, and it is not suitable for occasions where the end face clearance requirements are extremely high.

[0004] The industry has been looking for an end face locking and anti-loosening mechanism that has low processing requirements and is quick and easy to use, in order to simplify the structure, reduce costs and improve assembly efficiency. However, most current design solutions are still constrained by traditional ideas, that is, they are committed to improving the stop washer, but it is difficult to fundamentally solve the above problems.

[0005] Based on this, this case is brought forward. Summary of the invention

[0006] One of the purposes of the present invention is to provide a round nut locking mechanism to reduce processing accuracy and improve assembly efficiency.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] A round nut locking mechanism, the round nut is used to be installed on the threaded connection part of the connected part, the threaded connection part of the connected part is provided with a plurality of slots, a convex ring is provided on one end face of the round nut, when the round nut is installed on the threaded connection part of the connected part, the convex ring is sleeved on the outside of the slot, and part of the convex ring can be knocked into the slot.

[0009] Furthermore, the card slot adopts an oblique slot structure.

[0010] Furthermore, the inner diameter of the convex ring is defined as d1, the outer diameter of the threaded connection portion of the connected component is defined as d2, and d1-d2=0.5 mm.

[0011] Furthermore, the round nut is provided with notches on its circumference for facilitating force application.

[0012] Furthermore, the notch adopts a straight slot structure.

[0013] A second object of the present invention is to provide an assembly method based on the above-mentioned round nut locking mechanism, comprising the following steps:

[0014] Screw the round nut into the threaded connection part of the connected part and pre-tighten it into place;

[0015] Tap the raised ring so that part of the raised ring enters the groove.

[0016] The advantages of the present invention are: as long as the pre-tightening is reasonable and meets the clearance requirements, the thin edge of the nut is knocked into the inclined groove of the shaft head to limit the rotation of the nut, the round nut can be more accurately adjusted in clearance, there is no dead angle restriction, the entire locking and positioning process is convenient and fast, the requirements for the processing accuracy of parts are reduced, and at the same time, the use of stop washers can be reduced, so as to avoid wrong installation and missing installation during the assembly process, and effectively control the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the shaft head of the connected member in the embodiment;

[0018] Figure 2 for Figure 1 AA cross-sectional view in FIG.

[0019] Figure 3 This is a schematic diagram of the structure of the round nut in the embodiment;

[0020] Figure 4 for Figure 3 AA cross-sectional view in FIG.

[0021] Figure 5 It is a schematic diagram of the assembly of the round nut and the shaft head of the connected member in the embodiment;

[0022] Figure 6 This is a physical diagram of the assembly of the round nut and the shaft head of the connected part in the embodiment;

[0023] Description of symbols

[0024] 1. Shaft head; 101. Bevel groove; 2. Round nut; 201. Protruding ring; 202. Notch. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the embodiments. It should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" herein are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0026] This embodiment proposes a round nut locking mechanism, and the round nut 2 needs to be installed on the threaded connection part of the connected part to achieve locking. The threaded connection part of the connected part in this embodiment is the threaded connection part of the shaft head 1, and the round nut 2 needs to be assembled on the threaded connection part of the shaft head 1 for locking.

[0027] like Figure 1 and Figure 2 As shown, the locking mechanism of this embodiment includes two inclined grooves 101 provided at the threaded connection portion of the shaft head 1. The alignment requirements of the two inclined grooves 101 are not high and the processing is convenient. Figure 3 and Figure 4 As shown, the locking mechanism also includes a round nut 2, and a convex ring 201 is provided on one end surface of the round nut 2. The convex ring 201 is a thin edge, and the inner diameter of the convex ring 201 is about 0.5mm larger than the outer diameter of the threaded connection part of the shaft head 1, so as to achieve rough positioning of the round nut 2 when screwed in. Figure 1 and Figure 4 As shown, in this embodiment, the outer diameter of the threaded connection portion of the shaft head 1 is 40 mm, and the inner diameter of the convex ring 201 is 40.5 mm.

[0028] like Figure 5 and Figure 6 As shown, during installation, the round nut 2 is screwed into the shaft head 1 for pre-tightening. After the pre-tightening is in place, the convex ring 201 is just sleeved on the outside of the inclined groove 101, and the convex ring 201 is knocked so that part of the convex ring 201 enters the inclined groove 101 to achieve locking. The process of knocking the convex ring 201 into the inclined groove 101 not only limits the rotational freedom of the round nut 2 to prevent it from loosening, but also does not need to consider the direction and gap size restrictions in the traditional method during the entire assembly process, achieving dead angle positioning.

[0029] In the present embodiment, the groove milled on the threaded connection part of the shaft head 1 adopts an inclined groove 101 instead of grooves of other shapes, mainly because the centering requirement of the inclined groove 101 is not high and it is more convenient to process; at the same time, the inclined surface of the inclined groove 101 can better cooperate with the convex ring 201. When the convex ring 201 is knocked in, the inclined surface of the inclined groove 101 can fit with the knocked-in part of the convex ring 201, thereby improving the locking effect.

[0030] Preferably, four straight grooves 202 are milled on the outer ring of the round nut 2. The grooves 202 are used for locking and applying force, so there is no requirement for the grooves to be evenly distributed like traditional round nuts (traditional round nuts are milled with grooves to embed the stop edge into the groove for easy clearance measurement, so there is a requirement for the grooves to be evenly distributed).

[0031] Under this embodiment, the machining accuracy of parts can be reduced, thereby improving efficiency, reducing assembly costs, and avoiding assembly errors and omissions. At the same time, the axial clearance can be adjusted accurately without dead angles and is easy to operate. This solution is worthy of promotion and application.

[0032] The above embodiments are only used to explain the concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A round nut locking mechanism, the round nut is used to be installed on the threaded connection part of the connected part, characterized in that: The threaded connection part of the connected part is provided with a plurality of slots, and a convex ring is provided on one end face of the round nut. When the round nut is installed on the threaded connection part of the connected part, the convex ring is sleeved on the outside of the slot, and part of the convex ring can be knocked into the slot.

2. A round nut locking mechanism according to claim 1, characterized in that: The card slot adopts an oblique slot structure.

3. A round nut locking mechanism according to claim 1, characterized in that: The inner diameter of the convex ring is defined as d1, the outer diameter of the threaded connection portion of the connected part is defined as d2, and d1-d2=0.5mm.

4. A round nut locking mechanism according to claim 1, characterized in that: The round nut is provided with notches on its circumference for easy force application.

5. A round nut locking mechanism as claimed in claim 4, characterized in that: The notch adopts a straight slot structure.

6. An assembly method of the round nut locking mechanism according to any one of claims 1 to 5, characterized in that: The following steps are involved: Screw the round nut into the threaded connection part of the connected part and pre-tighten it into place; Tap the raised ring so that part of the raised ring enters the groove.

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