CN112985807A

CN112985807A - Cambered surface roller ball holds in palm structure

Info

Publication number: CN112985807A
Application number: CN202110434364.0A
Authority: CN
Inventors: 栗心明; 江楠; 金旭阳; 杨萍
Original assignee: Qingdao University of Technology
Current assignee: Qingdao University of Technology
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-06-18

Abstract

The invention belongs to the technical field of mechanical equipment manufacturing, and in particular relates to a cambered roller ball support structure based on a rolling bearing raceway. There are two mutually parallel main shafts between the blocks. The main shaft is sleeved with a rolling bearing and a compression nut. The outer side of the rolling bearing is sleeved with a cambered roller, which can simulate the lubrication between the rolling element and the rolling track in the rolling bearing. The number and radius of curvature of the cambered rollers can simulate the geometric size effect between the actual bearing ball and the track, and explore the distribution of the oil pool near the contact between the rolling element and the inner and outer rings of the bearing and its influence on the lubrication state under the moving state of the bearing. Tests and observations have shown that the ball carrier can be used to simulate and analyze the distribution of lubricant flow between the rolling elements and raceways of a bearing.

Description

Cambered surface roller ball holds in palm structure

The technical field is as follows:

the invention belongs to the technical field of mechanical equipment manufacturing, and particularly relates to a cambered surface roller ball support structure based on a rolling bearing raceway, which can simulate the lubrication condition between a rolling body and a rolling track in a rolling bearing.

Background art:

the rolling bearing is a key basic part of mechanical equipment, can change sliding friction between a running shaft and a shaft seat into rolling friction, thereby reducing friction loss, and generally comprises an inner ring, an outer ring, a rolling body and a retainer, wherein the inner ring is matched with the shaft and rotates together with the shaft, the outer ring is matched with a bearing seat to play a supporting role, the rolling body is uniformly distributed between the inner ring and the outer ring by virtue of the retainer, the shape, size and number of the rolling body directly influence the service performance and service life of the rolling bearing, the retainer can uniformly distribute the rolling body, guide the rolling body to rotate to play a lubricating role, support the rotating shaft and parts on the shaft, and keep the normal working position and rotation precision of the shaft. The lubricating property of the rolling bearing affects the operation reliability of the whole equipment, the traditional ball-disk contact mode is commonly used for equivalently simulating the contact between the rolling body of the rolling bearing and the inner ring and the outer ring, and the lubricating property of the rolling bearing is analyzed theoretically and experimentally. In the ball-disc contact mode, the inner ring and the outer ring of the bearing are replaced by glass discs or glass rings, the rolling bodies are replaced by steel balls, the optical interference images are captured by a laser, a microscope and a CCD (charge coupled device), the thickness of an oil film in a lubrication contact area is obtained by processing the images through real-time optical interference images and a DIIM (digital image acquisition) technology, and the lubrication state in the contact area is further quantitatively analyzed. The supporting and loading of the steel ball in the ball-disk oil testing film measuring device is usually realized by a ball support, as shown in fig. 1, a common ball support structure comprises a double-V-shaped bearing structure and a 4-rolling bearing structure, which can ensure the rotation of the steel ball, as shown in fig. 2 and 3.

However, the influence of the bearing raceway arc on the flowing distribution of the lubricant is ignored in the ball-disc contact mode, and the steel ball support mode intentionally avoids the contact of the steel ball and the raceway of the ball support, so that the contact geometric characteristics between the rolling element and the inner and outer rings in the real bearing are difficult to reproduce. Therefore, aiming at the measurement limitation of a ball-disc contact mode, based on the geometric contact characteristics of the rolling body of the rolling bearing and the inner ring and the outer ring of the rolling bearing, the cambered roller ball support with the curvature is researched and designed, and the phenomenon of lubricant backfill caused by the contact geometric characteristics is observed on the basis of reproducing the real contact of the bearing, so that the method has important significance.

The invention content is as follows:

the invention aims to overcome the defects in the prior art, and develops and designs a cambered surface roller ball support structure, which reproduces the geometric contact characteristics of a rolling body of a rolling bearing and inner and outer rings and observes the backfill characteristics of a lubricant and the influence of the backfill characteristics on the lubricating state.

In order to achieve the purpose, the main body structure of the cambered roller ball support structure comprises a base, a pressing block, a main shaft, a rolling bearing, a compression nut and a cambered roller; two main shafts which are parallel to each other are arranged between the base and the pressing block, a rolling bearing 4 and a gland nut are sleeved on the main shafts, and a cambered surface roller is sleeved on the outer side of the rolling bearing.

The base related by the invention is connected with the pressing block in a bolt manner; the main shaft is made of No. 45 steel; the compression nut is M14 × 1.5.

The compression nut only compresses the inner ring of the rolling bearing, does not compress the cambered roller, does not influence the rotation of the cambered roller, and depends on the transition fit with the rolling bearing for positioning the cambered roller.

Compared with the prior art, the ball support mainly comprises a bracket, cambered surface rollers and a pressing block, can simulate the lubrication condition between a rolling body and a rolling track in a rolling bearing, can simulate the geometric size effect between actual bearing balls and the track by changing the number and the curvature radius of the cambered surface rollers, explores the distribution form of an oil pool near the contact of the rolling body and inner and outer rings of the bearing in the motion state of the bearing and the influence of the distribution form on the lubrication state, and proves that the ball support can be used for simulating and analyzing the flow distribution of a lubricant between the rolling body and the rolling track of the bearing through tests and observation; the device has a simple structure, is scientific and reliable in principle, and can accurately and quickly acquire the influence of the contact curvature of the rolling element of the rolling bearing and the inner and outer rings on the distribution of an oil pool, the backfill of a lubricant and the lubrication state.

Description of the drawings:

fig. 1 is a schematic structural diagram of a main body of a ball-disk oil test film measuring device according to the background art of the present invention.

Fig. 2 is a structural diagram of a double V-shaped bearing according to the background art of the present invention.

FIG. 3 is a structural view of a 4-rolling bearing according to the background of the invention.

Fig. 4 is a schematic diagram of the main structure of the present invention.

Fig. 5 is a rear view of the main structure of the present invention.

Fig. 6 is a top view of the main structure of the present invention.

Fig. 7 is a 3D schematic diagram of the main structure of the present invention.

Fig. 8 is a schematic view of a main structure of a cambered roller according to the present invention.

Fig. 9 is a schematic view of ball holders of different numbers of cambered surface rollers according to embodiment 2 of the present invention.

Fig. 10 is a schematic diagram showing test results of ball-carrier oil lubrication of different numbers of cambered surface rollers according to embodiment 2 of the present invention.

Fig. 11 is a schematic view showing the results of the oil lubrication test of the ball bearings of the cambered rollers with different curvatures according to example 2 of the present invention, wherein (a) is the ball bearing of the single cambered roller, and (b) is the ball bearing of the double cambered roller.

Fig. 12 is a schematic diagram showing test results of grease lubrication of different numbers of cambered rollers according to embodiment 2 of the present invention.

Fig. 13 is a schematic diagram showing the test results of grease lubrication of the cambered rollers with different curvatures according to embodiment 2 of the present invention.

The specific implementation method comprises the following steps:

the invention is further described with reference to the accompanying drawings and the specific implementation method.

Example 1:

the main structure of the cambered roller ball support structure related to the present embodiment is shown in fig. 4-8, and includes a base 1, a pressing block 2, a main shaft 3, a rolling bearing 4, a compression nut 5 and a cambered roller 6; two main shafts 3 which are parallel to each other are arranged between a base 1 and a pressing block 2 of the U-shaped structure, the base 1 is in bolt connection with the pressing block 2, a rolling bearing 4 and a compression nut 5 are sleeved on the main shafts 3, a cambered surface roller 6 is sleeved on the outer side of the rolling bearing 4, and the compression nut 5 only compresses an inner ring of the rolling bearing 4 without compressing the cambered surface roller 6.

Example 2:

in this embodiment, in order to quantitatively compare the influence of the arc roller 6 on the lubrication state, the arc roller 6 is matched with a conventional V-shaped bearing roller, and according to the number of the arc rollers 6 used, a double V-shaped roller ball support, a single arc roller ball support and a double arc roller ball support as shown in fig. 9 are respectively formed; in order to observe the influence of curvature on the lubricating state, cambered surface roller ball holders with the curvature radiuses of 13mm, 14mm and 15mm are manufactured respectively, and the radius r of a steel ball in a ball-disc (ball-ring) oil test film measuring device is 12.7 mm.

Firstly, the influence of different numbers of cambered surface rollers on the backfilling of the lubricant under the oil lubrication condition is as follows:

supporting the steel balls by using different numbers of cambered surface roller ball holders, dripping 10 mu l of PAO10 basic oil on the steel balls, uniformly distributing lubricating oil on the glass disc, the steel balls and the cambered surface rollers 6 at a set load and a set speed, then applying a load of 30N, and collecting oil film light interference images at different speeds under the test condition, wherein the result is shown in figure 10, and the integral lubricating state of the ball holder with the cambered surface rollers 6 is better; and the oil pools are distributed differently, which is mainly influenced by the backflow of the ball support oil pool of the cambered surface roller 6, and the function of backfilling the lubricant on the steel ball is reflected.

Secondly, the influence of the cambered surface rollers 6 with different curvatures on the backfilling of the lubricant under the oil lubrication condition is as follows:

adopting ball holders of cambered rollers 6 with different curvatures, supplying 10 mu l of PAO10 base oil in the same way, wherein the test load is 30N, and obtaining the test results of the ball holders of 1 cambered roller 6 and the ball holders of 2 cambered rollers 6 shown in FIG. 11, wherein the smaller the curvature radius is, the better the lubricating effect is, and the smaller the total phase difference is; and the difference between the curvature of the ball supports of the 2 cambered rollers 6 is more obvious than that of the ball supports of the 1 cambered rollers 6.

Thirdly, the influence of different numbers of cambered surface rollers 6 on the backfilling of the lubricant under the condition of grease lubrication:

0.5g of lubricating grease is uniformly distributed on a glass disc by adopting ball holders with different numbers of cambered rollers 6, the fixed entrainment speed is set to be 64mm/s, the load is 30N, a change graph of oil film interference along with time under the condition of 30N shown in figure 12 is acquired, and the more the number of the cambered rollers 6 is, the longer the effective lubrication time of the grease lubrication is.

Fourthly, the influence of the cambered surface rollers 6 with different curvatures on the backfilling of the lubricant under the condition of grease lubrication:

0.5g of lubricating grease is uniformly distributed on a glass disc by adopting ball holders of cambered rollers 6 with different curvatures, the fixed entrainment speed is set to be 64mm/s, the load is 30N, and the result shown in figure 13 is acquired, so that the smaller the curvature radius is, the longer the effective lubrication time is, and the different curvatures have obvious differences.

Claims

1. A cambered roller ball holder structure, characterized in that the main structure comprises a base, a pressure block, a main shaft, a rolling bearing, a compression nut and a cambered roller; The main shaft is sleeved with a rolling bearing and a compression nut, and the outer side of the rolling bearing is sleeved with a cambered roller.

2 . The cambered roller ball holder structure according to claim 1 , wherein the base is bolted to the pressing block. 3 .

3 . The cambered roller ball holder structure according to claim 2 , wherein the material of the main shaft is 45# steel. 4 .

4 . The cambered roller ball holder structure according to claim 3 , wherein the compression nut is M14*1.5. 5 .

5. A cambered roller ball holder structure according to any one of claims 1-4, wherein the compression nut only compresses the inner ring of the rolling bearing and does not compress the cambered roller , The positioning of the cambered roller depends on the transition fit with the rolling bearing.