Axle Spindle Assembly Capable of Quantitatively Adjusting Bearing Clearance

Technical Field

The utility model relates to an axle spindle assembly, in particular to an axle spindle assembly capable of quantitatively adjusting bearing clearance, belonging to the technical field of semi-trailer axles.

Background Technology

With the rapid development of the national economy, the development of special transport semi-trailers has become increasingly prominent, and people’s awareness of product quality has improved, making the extension of product service life an urgent issue.

The semi-trailer axle is a core component of a special semi-trailer. The optimal floating clearance of bearing 518445 during assembly is preferably between 0.13 mm and 0.20 mm. If the bearing floating clearance is too small, it may cause bearing overheating, reduce lubricant viscosity, generate uneven local heating due to rolling friction, and reduce bearing precision. If the bearing floating clearance is too large, the number of rolling elements carrying the load during operation is relatively reduced, while also causing eccentric loading of the axle center. Especially during turning, edge stress concentration occurs in the bearing, greatly reducing the bearing service life.

Summary of the Utility Model

The purpose of the utility model is to provide an axle spindle assembly capable of quantitatively adjusting bearing clearance, so as to solve the problems mentioned in the background technology, including overheating caused by excessively small bearing floating clearance, reduced lubricant viscosity, and reduced load-bearing roller quantity caused by excessively large bearing floating clearance.

To achieve the above purpose, the utility model provides the following technical solution:

An axle spindle assembly capable of quantitatively adjusting bearing clearance comprises an axle body and two wheel hubs. The two wheel hubs are respectively sleeved onto both ends of the axle body. Two bearings connected to the axle body are fixedly arranged in the middle portions of the two wheel hubs. External threads are formed on the outer surfaces of both ends of the axle body. Nuts are threaded onto both ends of the axle body. Reference holes, first cotter pin holes, and second cotter pin holes are formed at both ends of the axle body. Eight equally spaced cotter pin grooves are formed on the surfaces of the two nuts.

Preferably, the included angle between the two first cotter pin holes and the horizontal plane is 22.5°, and the included angle between the two second cotter pin holes and the horizontal plane is 33.75°.

Preferably, the pitch of the two external threads is 2.12 mm.

Preferably, sealing covers are snap-fitted to the middle portions of one sides of the two wheel hubs.

Preferably, washers are installed between the two nuts and the bearings.

Beneficial Effects

Compared with the related technology, the axle spindle assembly capable of quantitatively adjusting bearing clearance provided by the utility model has the following beneficial effects:

After tightening the nuts on the axle spindle, the nuts are rotated by a certain angle to appropriately enlarge the floating clearance of the two wheel-end bearings, thereby improving the service life of the wheel-end bearings.

By providing first cotter pin holes and second cotter pin holes with different spacing intervals, the clearance can be quantitatively adjusted, additional cotter pin combinations can be achieved, the range of bearing floating clearance can be changed, and the bearing service life can be improved.

Description of the Drawings

Figure 1 is a structural schematic diagram of the utility model;

Figure 2 is a partially enlarged structural schematic diagram of the utility model;

Figure 3 is a sectional structural schematic diagram of the axle body of the utility model;

Figure 4 is a structural schematic diagram of the nut of the utility model;

Figure 5 is a structural schematic diagram after the nut rotates by 22.5°;

Figure 6 is a structural schematic diagram after the nut rotates by 33.75°.

Reference numerals in the drawings:

Axle body

Reference hole

First cotter pin hole

Second cotter pin hole

Wheel hub

Bearing

Nut

Cotter pin groove

Washer

Sealing cover

Detailed Description

The technical solutions in the embodiments of the utility model are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model rather than all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort fall within the protection scope of the utility model.

Embodiment 1

Referring to Figures 1–6, the utility model provides an axle spindle assembly capable of quantitatively adjusting bearing clearance, including an axle body 1 and two wheel hubs 2. The two wheel hubs 2 are respectively sleeved onto both ends of the axle body 1. Two bearings 3 connected to the axle body 1 are fixedly arranged in the middle portions of the two wheel hubs 2.

External threads are formed on the outer surfaces of both ends of the axle body 1. Nuts 4 are threaded onto both ends of the axle body 1. Reference holes 101 and first cotter pin holes 102 are formed at both ends of the axle body 1. Eight equally spaced cotter pin grooves 401 are formed on the surfaces of the two nuts 4.

The included angle between the two first cotter pin holes 102 and the horizontal plane is 22.5°, meaning that when the nut 4 rotates by 22.5°, one cotter pin groove 401 can align with the first cotter pin hole 102.

The pitch of the two external threads is 2.12 mm, meaning that when the nut rotates 360 degrees, the nut 4 moves axially by 2.12 mm.

Sealing covers 6 are snap-fitted to the middle portions of one sides of the two wheel hubs 2.

Washers 5 are installed between the two nuts 4 and the bearings 3.

Embodiment 2

The assembly further includes two second cotter pin holes 103, which are respectively formed on the surfaces of both ends of the axle body 1.

The included angle between the two second cotter pin holes 103 and the horizontal plane is 33.75°, meaning that when the nut 4 rotates by 33.75°, one cotter pin groove 401 can align with the second cotter pin hole 103.

Specifically, as shown in Figures 1, 2, and 3, the two nuts 4 are first rotated by 33.75°, enabling the two second cotter pin holes 103 to align with the corresponding cotter pin grooves 401 of the two nuts 4, after which cotter pin combinations are installed to adjust the floating clearance of the bearings 3. This appropriately enlarges the floating clearance of the two bearings 3 and improves their service life.

Working Principle

During specific use, the bearings 3 are first assembled back-to-back, and the two nuts 4 are tightened with a tightening torque of 240–260 Nm to eliminate the floating clearance of the bearings 3.

After the nuts 4 are tightened, the nuts are rotated by a certain angle to appropriately enlarge the floating clearance of the two bearings 3. The nut grooves of the nuts 4 are backed off to the nearest axle hole position by 0.5–0.75 groove intervals. The rotation angle of the nuts 4 is between 22.5° and 33.75°, thereby forming a bearing floating clearance of 0.13–0.198 mm.

The first cotter pin holes 102 or second cotter pin holes 103 are aligned with the corresponding cotter pin grooves 401 of the nuts 4, and cotter pin combinations are installed to quantitatively adjust the bearing floating clearance. This appropriately enlarges the floating clearance of the two bearings 3 and improves their service life.

After adjustment, the two sealing covers 6 are installed to seal the bearings 3.

Although embodiments of the utility model have been illustrated and described, those skilled in the art can understand that various changes, modifications, substitutions, and variations may be made without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.