Combined roller bearing

Abstract

The utility model provides a combined roller cutter bearing, comprising a cutter shaft arranged as an inner ring and a roller cutter body arranged as an outer ring, two radial raceways for installing cylindrical rollers are arranged on the outer peripheral wall of the cutter shaft, a boss is formed between the two radial raceways, the outer peripheral wall of the boss comprises at least two axial abutment surfaces, and the two axial abutment surfaces of the boss distributed along the axial direction form an axial raceway for installing a thrust cylindrical roller bearing, radial loads and axial loads are respectively borne by the radial raceway corresponding to the cylindrical roller installation and the axial raceway corresponding to the thrust cylindrical roller installation, the overturning moment generated by the external axial radial load is borne by the cylindrical roller bearing and the thrust cylindrical roller bearing together, so that the cylindrical roller and the thrust cylindrical roller are respectively installed on different raceways, thereby being able to effectively separate the radial load and the axial load, thereby improving the bearing capacity and stability of the bearing.

Description

Technical Field

[0001] The utility model relates to a combined roller cutter bearing. Background Art

[0002] With the rapid development of the national economy, people's demand for quality of life and convenient transportation is increasing, and the country is also increasing its investment in infrastructure. Therefore, the construction of high-speed railway tunnels is also becoming more frequent, which plays a vital role in the use of tunnel boring machines and the cutter heads attached to their cutter heads; the use of bearings inside them is also extremely considerable.

[0003] Cutter bearings are an important component used in engineering machinery such as shield machines. They mainly bear the radial and axial forces generated by the cutter during rock breaking. The reliability and performance of this bearing have a significant impact on the excavation operation and consumption of the cutter. Cutter bearings are special parts for shield machine engineering equipment. Their market demand is greatly affected by domestic infrastructure construction. With the increase in demand for shield machines, the demand for cutter bearings is also rising.

[0004] The current roller cutter bearings are not suitable for heavy-load applications and cannot meet the conditions of combined axial and radial loads and overturning moments. The rolling elements inside the bearings cannot fully withstand the axial and radial loads, which affects the application of the bearings. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a combined roller cutter bearing.

[0006] To achieve the above-mentioned purpose, the utility model provides a combined roller cutter bearing, including a cutter shaft arranged as an inner ring and a roller cutter body arranged as an outer ring, two radial raceways for cylindrical roller installation are arranged on the outer peripheral wall of the cutter shaft, a boss is formed between the two radial raceways, the outer peripheral wall of the boss includes at least two axial abutment surfaces, and the two axial abutment surfaces of the boss distributed axially form an axial raceway for the installation of a thrust cylindrical roller bearing, and radial loads and axial loads are respectively borne by installing the cylindrical roller corresponding to the radial raceway and installing the thrust cylindrical roller corresponding to the axial raceway.

[0007] Furthermore, the outer diameter of the hob body is gradually reduced in the axial direction, and the cylindrical roller includes a first cylindrical roller arranged near the end of the hob body with a larger outer diameter, and a second cylindrical roller arranged near the end of the hob body with a smaller outer diameter, and the first cylindrical roller is larger than the second cylindrical roller.

[0008] Furthermore, a first gasket is arranged between the two rows of cylindrical rollers and the inner circumferential wall of the cutter body, and a second gasket is arranged on the axially outward end of the thrust cylindrical roller and is fitted with its end face, and the axial end face of the second gasket abuts against the axial end face of the first gasket.

[0009] Furthermore, a sealing groove and a sealing ring that cooperates with the sealing groove to seal are provided between the first gasket and the hob body.

[0010] Furthermore, a guiding inclined surface is provided between the axial abutting surface of the boss and the radial raceway.

[0011] The beneficial effects of the utility model are as follows: by providing four raceway structures, two radial raceways and two axial raceways, it is equivalent to four conventional bearings being embedded in the hob cutter chamber, two radial cylindrical roller bearings bear radial loads, and two axial thrust cylindrical roller bearings bear axial loads; the overturning moment generated by the external axial radial load is jointly borne by the cylindrical roller bearings and the thrust cylindrical roller bearings, so that the cylindrical rollers and the thrust cylindrical rollers are respectively installed on different raceways, thereby effectively separating the radial load and the axial load, improving the bearing capacity and stability of the bearing, and the axial raceway formed by the axial abutment surface on the outer peripheral wall of the boss distributes the load more reasonably and reduces the stress concentration of a single rolling body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A. DETAILED DESCRIPTION

[0014] The following is a further description of the embodiment of the utility model in conjunction with the accompanying drawings: As shown in the figure, the combined cutter bearing includes a cutter shaft 1 as an inner ring and a cutter body 2 as an outer ring. Two radial raceways 3 for cylindrical roller installation are arranged on the outer peripheral wall of the cutter shaft 1. A boss 4 is formed between the two radial raceways 3. The outer peripheral wall of the boss 4 includes at least two axial abutment surfaces 5. The two axial abutment surfaces 5 distributed along the axial direction of the boss 4 form an axial raceway for the installation of the thrust cylindrical roller bearing. The radial raceway 3 corresponds to the cylindrical roller installation, and the axial raceway corresponds to the thrust cylindrical roller installation to bear radial load and axial load respectively. The bearing is used in the reverse shaft type tunnel boring machine. The internal structure is that the radial cylindrical roller bearing adopts a full roller design, has a strong load-bearing capacity, is suitable for heavy load and low speed occasions, and the thrust cylindrical roller bearing adopts a metal cage design, which is convenient for the processing and assembly of the bearing; at the same time, it needs good sealing performance to prevent the entry of harsh and dirty mud and water from the outside.

[0015] The outer diameter of the hob body 2 is gradually reduced in the axial direction, and the cylindrical rollers include a first cylindrical roller 6 arranged near the end of the hob body 2 with a larger outer diameter, and a second cylindrical roller 7 arranged near the end of the hob body 2 with a smaller outer diameter, and the first cylindrical roller 6 is larger than the second cylindrical roller 7. In this way, the load can be distributed more reasonably, ensuring that the rolling elements at different positions can evenly bear the corresponding loads, thereby improving the overall load-bearing capacity and stability.

[0016] A first gasket 8 is also provided between the two rows of cylindrical rollers and the inner circumferential wall of the hob body, and a second gasket 9 is provided at the axially outward end of the thrust cylindrical roller to fit with its end face, and the axial end face of the second gasket 9 abuts against the axial end face of the first gasket 8. Adjusting the gap and preload: By using gaskets, the gap between the cylindrical roller and the thrust cylindrical roller can be accurately adjusted, and preload (preload force) can be applied. This helps to improve the rigidity of the bearing.

[0017] A sealing groove and a sealing ring that seals with the sealing groove are also provided between the first gasket 8 and the hob body 2. The provision of the sealing groove and the sealing ring can effectively prevent the leakage of lubricating oil and external pollutants (such as dust, moisture and other particles) from entering the interior of the bearing, and protect the cleanliness and lubrication conditions of the rolling element. The sealing ring helps to maintain the stability of the lubricating grease inside the bearing and avoid performance degradation due to grease loss or contamination.

[0018] A guide slope 10 is also provided between the axial abutment surface 5 of the boss 4 and the radial raceway 3. The guide slope 10 makes the installation and removal of the roller smoother and facilitates the assembly and maintenance of the bearing. The guide slope 10 can ensure that the roller correctly enters and remains in the raceway during installation and movement, thereby improving the guidance and stability of the roller. It also prevents mutual interference between the cylindrical roller and the thrust cylindrical roller.

[0019] The installation steps of the utility model are as follows: (1) Stand the cutter shaft 1 upright and embed the thrust cylindrical roller retainer assembly and gasket; (2) Fill in the first cylindrical roller 6 cylindrical roller, fill the raceway of the cutter shaft 1, and then install the long cylindrical outer ring; (3) Place the installed components on top of the tooling to prevent the outer ring from falling off; (4) Repeat steps 1 and 2 to install the upper thrust cylindrical roller retainer assembly, gasket and second cylindrical roller 7, and outer ring assembly; (5) Place the assembled components in the hob body 2, install the seals on both sides, and the assembly is complete.

[0020] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A combined cutter bearing, comprising a cutter shaft as an inner ring and a cutter body as an outer ring, characterized in that: Two radial raceways for cylindrical roller installation are arranged on the outer peripheral wall of the knife shaft, and a boss is formed between the two radial raceways. The outer peripheral wall of the boss includes at least two axial abutment surfaces. The two axial abutment surfaces of the boss distributed along the axial direction form an axial raceway for the installation of a thrust cylindrical roller bearing. The radial raceway corresponds to the cylindrical roller installation, and the axial raceway corresponds to the thrust cylindrical roller installation to bear radial loads and axial loads respectively.

2. The combined cutter bearing according to claim 1, characterized in that: The outer diameter of the hob body is gradually reduced in the axial direction, and the cylindrical roller includes a first cylindrical roller arranged near the end of the hob body with a larger outer diameter, and a second cylindrical roller arranged near the end of the hob body with a smaller outer diameter. The first cylindrical roller is larger than the second cylindrical roller.

3. The combined cutter bearing according to claim 1 or 2, characterized in that: A first gasket is arranged between the two rows of cylindrical rollers and the inner circumferential wall of the cutter body, and a second gasket is arranged on the axially outward end of the thrust cylindrical roller to fit with its end face, and the axial end face of the second gasket abuts against the axial end face of the first gasket.

4. The combined cutter bearing according to claim 3, characterized in that: A sealing groove and a sealing ring which cooperates with the sealing groove for sealing are also provided between the first gasket and the hob body.

5. The combined roller bearing according to claim 4, characterized in that: A guiding inclined surface is also arranged between the axial abutting surface of the boss and the radial raceway.

Images