CN216306453U

CN216306453U - Self-locking structure of pre-tightening nut

Info

Publication number: CN216306453U
Application number: CN202122465581.4U
Authority: CN
Inventors: 韩金腾; 王博文; 吴桐; 田晓庆; 张超
Original assignee: Yantai Eddie Precision Machinery Co Ltd
Current assignee: Yantai Eddie Precision Machinery Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-04-15
Anticipated expiration: 2031-10-13

Abstract

The utility model relates to the technical field of fastening, in particular to a self-locking structure of a pre-tightening nut, which comprises the pre-tightening nut and is characterized in that: a plurality of rectangular grooves are uniformly formed in the circumferential outer circular surface of the pre-tightening nut along the axial direction of the pre-tightening nut, and more than one clamping jaw suitable for being inserted into the rectangular grooves is formed in the lower end face of the planet carrier in a downward extending mode. Compared with the prior art, the self-locking structure does not need to be screwed with sealant or fastened with screws, and has the advantages of compact structure, high reliability, convenience in operation and the like.

Description

Self-locking structure of pre-tightening nut

Technical Field

The utility model relates to the technical field of fastening, in particular to a self-locking structure of a pre-tightening nut applied to a planet wheel speed reducer.

Background

The planet wheel speed reducer has the advantages of small volume, high transmission efficiency, wide speed reduction range, high precision and the like, and is widely applied to the aspects of hoisting transportation, engineering machinery, metallurgy, mines, petrochemical industry, construction machinery and the like. The transmission bearing of the planet wheel speed reducer generally adopts 2 pre-tightening tapered roller bearings which are oppositely arranged, and then a pre-tightening nut is used for adjusting the pre-tightening force of the bearing so as to adjust the axial clearance and the radial clearance of the pre-tightening tapered roller bearings, so that the bearing is in an ideal working state; after the pretightening force is adjusted by the pretightening nut, the pretightening nut can gradually loosen after the bearing runs for a period of time due to high-speed vibration in the running process of the bearing, so that the bearing clearance is enlarged, the bearing ball is stressed to be enlarged, the service life of the bearing is seriously influenced, and the pretightening nut needs a corresponding locking mechanism. The conventional practice is generally 2 types: firstly, a pre-tightening nut is fastened by adopting thread glue, but after the pre-tightening nut runs for a period of time, the measure has certain failure risk; secondly, a threaded hole is drilled on the side face of the pre-tightening nut, and 2 fastening screws which are arranged at 90 degrees are used for fastening the pre-tightening nut. The method has high reliability and does not have the risk of failure, but the method needs a large operation space, the structure of the planet wheel speed reducer is mostly compact, and if the installation space of a fastening screw is lacked, the structure cannot be adopted.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical problems in the prior art, the utility model provides a novel nut self-locking structure, which adopts the technical scheme that:

the utility model provides a self-locking structure of pretension nut, includes pretension nut, its characterized in that: a plurality of rectangular grooves are uniformly formed in the circumferential outer circular surface of the pre-tightening nut along the axial direction of the pre-tightening nut, and more than one clamping jaw suitable for being inserted into the rectangular grooves is formed in the lower end face of the planet carrier in a downward extending mode.

Furthermore, a section of spline with convex and concave alternated is arranged on the circumferential inner circular surface close to the lower end of the planet carrier, and correspondingly, a section of spline groove which is in sliding fit with the spline and is concave and convex alternated is arranged on the circumferential outer circular surface at the upper end of the speed reducer base.

Furthermore, the speed reducer base is connected with the speed reducer flange through the tapered roller bearing A and the tapered roller bearing B in a switching mode, the taper angles of the tapered roller bearing A and the tapered roller bearing B are arranged in a back-to-back mode, the inner rings of the tapered roller bearing A and the tapered roller bearing B are sleeved on the speed reducer base, the outer rings of the tapered roller bearing A and the tapered roller bearing B support the speed reducer flange, the lower end face of the inner ring of the tapered roller bearing A is limited through the upper step face of the speed reducer base, the lower end face of the outer ring of the tapered roller bearing B and the upper end face of the outer ring of the tapered roller bearing A are limited through the upper end face and the lower end face of the annular flange of the speed reducer flange, and the upper end face of the outer ring of the tapered roller bearing B is abutted to the lower end face of the pre-tightening nut to adjust the clearance.

Compared with the prior art, the self-locking structure does not need to be screwed with sealant or fastened with screws, and has the advantages of compact structure, high reliability, convenience in operation and the like.

Drawings

FIG. 1 is a schematic structural view of example 1.

Fig. 2 is a schematic structural view of the prefastened nut of example 1.

Fig. 3 is a schematic structural view of the carrier of embodiment 1.

In the figure: 1. a planet carrier; 2, pre-tightening the nut; 3, a tapered roller bearing A; 4, a speed reducer flange; a tapered roller bearing B; 6. a speed reducer base; 7. a claw; 8. a spline; 9. a rectangular groove.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1-3, a speed reducer base 6 is connected to a speed reducer flange 4 through a tapered roller bearing a5 and a tapered roller bearing B3, taper angles of the tapered roller bearing a5 and the tapered roller bearing B3 are arranged in a reverse manner, inner rings of the tapered roller bearing a5 and the tapered roller bearing B3 are sleeved on the speed reducer base 6, outer rings of the tapered roller bearing a5 and the tapered roller bearing B3 support the speed reducer flange 4, a lower end face of an inner ring of the tapered roller bearing a5 is limited by an upper step face of the speed reducer base 6, a lower end face of an outer ring of the tapered roller bearing B3 and an upper end face of an outer ring of the tapered roller bearing a5 are limited by upper and lower end faces of an annular flange of the speed reducer flange 4, and an upper end face of an outer ring of the tapered roller bearing B3 is abutted to a lower end face of the pretension nut 2 to adjust a play.

8 rectangular grooves 9 are uniformly formed in the circumferential outer circular surface of the pre-tightening nut 2 along the axial direction of the pre-tightening nut (the number can be determined according to actual conditions, the more the number is, the higher the adjustable precision is), and 2 clamping claws 7 suitable for being inserted into the rectangular grooves 9 are formed in the lower end surface of the planet carrier 1 in a downward extending mode. The connecting line of the 2 clamping claws 7 passes through the axis line of the planet carrier 1.

A section of convex-concave alternate spline 8 is arranged on the circumferential inner circular surface close to the lower end of the planet carrier 1, and correspondingly, a section of convex-concave alternate spline groove in sliding fit with the spline 8 is arranged on the circumferential outer circular surface at the upper end of the speed reducer base 6.

In actual use, after the pretightening force is adjusted by the pretightening nut, the clamping jaws of the planet carrier are clamped in the rectangular groove in the outer ring of the pretightening nut, the planet carrier and the speed reducer base are connected into a whole through the spline, the clamping jaws of the planet carrier clamp the pretightening nut, so that the pretightening nut cannot rotate freely, self-locking is formed on the pretightening nut, and the problem of looseness of the pretightening nut after long-time running is effectively prevented. The novel nut self-locking structure does not need to be screwed with sealant or fastened with screws, and has the advantages of compact structure, high reliability, convenience in operation and the like.

The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; those skilled in the art can make many possible variations or modifications to the utility model using the methods and techniques disclosed above, or to modify equivalent embodiments without departing from the scope of the utility model. Any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical scheme of the present invention.

Claims

1. The utility model provides a self-locking structure of pretension nut, includes pretension nut (2), its characterized in that: a plurality of rectangular grooves (9) are uniformly formed in the circumferential outer circular surface of the pre-tightening nut (2) along the axial direction of the pre-tightening nut, and more than one clamping jaw (7) suitable for being inserted into the rectangular grooves (9) is formed in the lower end face of the planet carrier (1) in a downward extending mode.

2. The self-locking structure of the pre-tightening nut as claimed in claim 1, wherein: a section of convex-concave alternate spline (8) is arranged on the circumferential inner circular surface close to the lower end of the planet carrier (1), and correspondingly, a section of convex-concave alternate spline groove in sliding fit with the spline (8) is arranged on the circumferential outer circular surface at the upper end of the speed reducer base (6).

3. The self-locking structure of the pre-tightening nut as claimed in claim 1, wherein: the speed reducer is characterized in that the speed reducer base (6) is connected with the speed reducer flange (4) through the tapered roller bearing A (5) and the tapered roller bearing B (3), the taper angles of the tapered roller bearing A (5) and the tapered roller bearing B (3) are arranged in a back-to-back mode, the inner rings of the tapered roller bearing A (5) and the tapered roller bearing B (3) are sleeved on the speed reducer base (6), the outer rings of the tapered roller bearing A (5) and the tapered roller bearing B (3) support the speed reducer flange (4), the lower end face of the inner ring of the tapered roller bearing A (5) is limited through the upper step face of the speed reducer base (6), the lower end face of the outer ring of the tapered roller bearing B (3) and the upper end face of the outer ring of the tapered roller bearing A (5) are limited through the upper end face and the lower end face of the annular convex edge of the speed reducer flange (4), and the upper end face of the outer ring of the tapered roller bearing B (3) is abutted to the lower end face of the pre-tightening nut (2) to adjust the clearance.