Long-life combined bearing of screw drill

Abstract

The long-life combined bearing comprises a top column part, a bottom column part, at least two groups of middle column parts and oil storage cavities formed among the top column part, the bottom column part and the middle column parts, the top column part comprises a top column inner ring, a top column first half outer ring, a top column second half outer ring and steel balls among the top column inner ring, the top column first half outer ring and the top column second half outer ring; the bottom row part comprises a bottom row inner ring, a bottom row first half outer ring, a bottom row second half outer ring and steel balls among the bottom row inner ring, the bottom row first half outer ring and the bottom row second half outer ring; the middle column part comprises an inner space ring, an outer space ring, a shaft ring, a seat ring and steel balls among the inner space ring, the outer space ring, the shaft ring and the seat ring, the inner space ring and the outer space ring which are provided with spring steel can resist impact force; a closed state is formed, and slurry can be prevented from entering; grease lubrication is guaranteed through the oil storage cavity, friction of the inner ring, the shaft ring, the outer ring, the seat ring and the steel ball can be reduced, and the service life of the bearing is prolonged; and the total axial force is decomposed, so that the stress of each row of steel balls is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to a long-life combined bearing for a screw drill. Background Art

[0002] The existing multi-row thrust ball bearings cannot be used in screw drills because the housing of the transmission shaft assembly needs bearings for positioning. The existing multi-row ball bearings cannot play a positioning role. The existing string bearings can play a positioning role, but the service life of the bearings is more than 100 hours, which is short. We need to develop a combined bearing that can both position and increase the service life of the bearings. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a long-life combined bearing for a screw drill.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a long-life combined bearing for screw drilling tools, including a top row part, a bottom row part, at least two groups of middle row parts and an oil storage cavity formed therebetween; the top row part includes a connected top row inner ring, a top row first half outer ring, a top row second half outer ring and steel balls therebetween; the bottom row part includes a connected bottom row inner ring, a bottom row first half outer ring, a bottom row second half outer ring and steel balls therebetween; the middle row part includes a connected inner spacer ring, an outer spacer ring, a shaft ring, a seat ring and steel balls therebetween.

[0005] Furthermore, an outer sealing ring is provided between the top row inner ring and the first half outer ring of the top row, and between the bottom row inner ring and the second half outer ring of the bottom row.

[0006] Furthermore, inner sealing rings are provided between the top row inner ring and the second half outer ring of the top row, and between the bottom row inner ring and the first half outer ring of the bottom row.

[0007] Furthermore, the cross-section of the inner spacer ring is a positive L-shaped structure, and the material is spring steel; the horizontal side ring end face of the inner spacer ring is placed in the concave ring groove or end face of the lower shaft ring, the bottom row inner ring; the vertical side ring end face of the inner spacer ring is placed in the concave ring groove or end face of the upper top row inner ring, the shaft ring.

[0008] Furthermore, the cross-section of the outer spacer ring is an inverted L-shaped structure, and the material is spring steel; the end face of the horizontal side ring of the outer spacer ring is placed in the concave ring groove or end face of the second half outer ring and the seat ring in the upper top row; the end face of the vertical side ring of the outer spacer ring is placed in the concave ring groove or end face of the seat ring and the first half outer ring in the bottom row.

[0009] Furthermore, the cross-section of the outer spacer is a C-shaped structure and the material is spring steel; the end face of the upper end ring of the outer spacer is placed in the concave ring groove or end face of the second half outer ring and the seat ring in the upper top row; the end face of the lower end ring of the outer spacer is placed in the concave ring groove or end face of the seat ring and the first half outer ring in the bottom row.

[0010] Furthermore, the cross-section of the outer spacer is a Z-shaped structure and the material is spring steel; the end face of the upper end ring of the outer spacer is placed in the concave ring groove or end face of the second half outer ring and the seat ring in the upper top row; the end face of the lower end ring of the outer spacer is placed in the concave ring groove or end face of the seat ring and the first half outer ring in the bottom row.

[0011] Furthermore, the cross-section of the outer spacer is an I-type structure and the material is spring steel; the end face of the upper end ring of the outer spacer is placed in the concave ring groove or end face of the second half outer ring and the seat ring in the upper top row; the end face of the lower end ring of the outer spacer is placed in the concave ring groove or end face of the seat ring and the first half outer ring in the bottom row.

[0012] Furthermore, the cross-section of the outer spacer is a linear structure and the material is spring steel; the end face of the upper end ring of the outer spacer is placed in the concave ring groove or end face of the second half outer ring and the seat ring in the upper top row; the end face of the lower end ring of the outer spacer is placed in the concave ring groove or end face of the seat ring and the first half outer ring in the bottom row.

[0013] The present invention is provided with inner and outer spacers made of spring steel to resist impact force; a closed state is formed to prevent mud from entering; an oil storage cavity is used to ensure grease lubrication, which can reduce the friction of the inner ring, shaft ring, outer ring, seat ring and steel balls, and improve the service life of the bearing; the total axial force is decomposed to reduce the force on each row of steel balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The inverted L-shaped cross-section outer spacer structure of the present invention is schematically shown. Figure 1 ;

[0015] Figure 2 The inverted L-shaped cross-section outer spacer structure of the present invention is schematically shown. Figure 2 ;

[0016] Figure 3 The inverted L-shaped cross-section outer spacer structure of the present invention is schematically shown. Figure 3 ;

[0017] Figure 4 It is a schematic diagram of the structure of the outer spacer ring of the C-shaped cross section of the present invention;

[0018] Figure 5 It is a schematic diagram of the structure of the outer spacer ring of the Z-shaped cross section of the present invention;

[0019] Figure 6 It is a schematic diagram of the structure of the outer spacer ring with a straight cross section of the present invention;

[0020] Figure 7 It is a schematic diagram of the structure of the outer spacer ring of the I-type cross section of the present invention.

[0021] Among them: 1. outer sealing ring; 2. top row inner ring; 3. top row first half outer ring; 4. top row second half outer ring; 5. inner spacer; 6. outer spacer; 7. seat ring; 8. oil storage chamber; 9. shaft ring; 10. steel ball; 11. inner sealing ring; 12. bottom row first half outer ring; 13. bottom row inner ring; 14. bottom row second half outer ring. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-7 The specific implementation modes of the present invention are further described.

[0023] The long-life combined bearing for screw drilling tools comprises a top row part, a bottom row part, at least two groups of middle row parts and an oil storage cavity 8 formed therebetween; the top row part comprises a top row inner ring 2, a top row first half outer ring 3, a top row second half outer ring 4 connected thereto and steel balls 10 therebetween; the bottom row part comprises a bottom row inner ring 13, a bottom row first half outer ring 12, a bottom row second half outer ring 14 connected thereto and steel balls 10 therebetween; the middle row part comprises an inner spacer 5, an outer spacer 6, a shaft ring 9, a seat ring 7 connected thereto and steel balls 10 therebetween.

[0024] An outer sealing ring 1 is provided between the top row inner ring 2 and the top row first half outer ring 3 and between the bottom row inner ring 13 and the bottom row second half outer ring 14 .

[0025] Inner sealing rings 11 are provided between the top row inner ring 2 and the top row second half outer ring 4 and between the bottom row inner ring 13 and the bottom row first half outer ring 12 .

[0026] The cross-section of the inner spacer ring 5 is a regular L-shaped structure, and the material is spring steel; the horizontal side ring end face of the inner spacer ring 5 is placed in the concave ring groove or end face of the lower shaft ring 9 and the bottom row inner ring 13; the vertical side ring end face of the inner spacer ring 5 is placed in the concave ring groove or end face of the upper top row inner ring 2 and the shaft ring 9.

[0027] The cross-section of the outer spacer ring 6 is an inverted L-shaped structure, and the material is spring steel; the horizontal side ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the second half outer ring 4 and the seat ring 7 in the upper top row; the vertical side ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the seat ring 7 and the first half outer ring 12 in the bottom row.

[0028] The cross-sectional dimensions of the inner spacer 5 and the outer spacer 6 are different, and the axial force acting on the bearing can be decomposed into each row of ball bearings through the elastic variable. The magnitude of the force in each row is determined by the dimensions of the inner and outer spacers and the elastic variable. There are two forms: one is that the outer spacer 6 gradually increases from the thinnest cross section at the top, and the cross section of the last row is the thickest. The cross-sectional thickness of the inner spacer 5 is greater than the thickest cross section of the outer spacer 6. The other is that the inner spacer 5 gradually increases from the thinnest cross section at the top, and the cross section of the last row is the thickest. The thickness of the outer spacer 6 is greater than the thickest cross section of the inner spacer 5.

[0029] The cross-section of the outer spacer ring 6 is a C-shaped structure and is made of spring steel; the upper end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the second half outer ring 4 and the seat ring 7 in the upper top row; the lower end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the seat ring 7 and the first half outer ring 12 in the bottom row.

[0030] The cross-section of the outer spacer ring 6 is a Z-shaped structure and is made of spring steel; the upper end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the second half outer ring 4 and the seat ring 7 in the upper top row; the lower end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the seat ring 7 and the first half outer ring 12 in the bottom row.

[0031] The cross-section of the outer spacer ring 6 is an I-type structure and is made of spring steel; the upper end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the second half outer ring 4 and the seat ring 7 in the upper top row; the lower end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the seat ring 7 and the first half outer ring 12 in the bottom row.

[0032] The cross-section of the outer spacer ring 6 is a linear structure and is made of spring steel; the upper end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the second half outer ring 4 and the seat ring 7 in the upper top row; the lower end ring end face of the outer spacer ring 6 is placed in the concave ring groove or end face of the seat ring 7 and the first half outer ring 12 in the bottom row.

[0033] The inner spacer 5 and the outer spacer 6 are made of spring steel. After the bearing is assembled and pressed, if there is an impact force during operation, the destructive effect of the impact on the bearing can be alleviated through elastic deformation.

[0034] The diameter of the steel balls 10 in each row is the same, but the diameter of the steel balls 10 between rows can be the same or different, which is determined by the position and magnitude of the force. When the forces at both ends of the bearing are large, large steel balls 10 can be used, and when the forces in the middle are small, small steel balls 10 can be used.

[0035] Each layer has a gap a, the size of which is used to determine the distribution value of the axial force. It can be evenly distributed or unevenly distributed in each layer according to the size of the steel ball 10. The more rows there are, the greater the total axial force that the bearing can bear. After the total axial force is decomposed, the service life of the bearing will be doubled.

[0036] This bearing is composed of a four-point contact ball bearing, a thrust ball bearing and a spacer. The two ends of the bearing are radial four-point contact ball bearings, which cannot be changed. The rest of the middle part is a multi-row thrust ball bearing with more than two rows. The existing figure is a three-row thrust ball bearing, and it can also be a two-row, four-row, five-row... multi-row thrust ball bearing. The number of rows of the thrust ball bearing is determined according to the working force.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Long-life combined bearings for screw drills, characterized in that: The invention comprises a top row part, a bottom row part, at least two groups of middle row parts and an oil storage cavity (8) formed therebetween; the top row part comprises a top row inner ring (2), a top row first half outer ring (3), a top row second half outer ring (4) connected thereto and a steel ball (10) therebetween; the bottom row part comprises a bottom row inner ring (13), a bottom row first half outer ring (12), a bottom row second half outer ring (14) connected thereto and a steel ball (10) therebetween; and the middle row part comprises an inner spacer ring (5), an outer spacer ring (6), a shaft ring (9), a seat ring (7) connected thereto and a steel ball (10) therebetween.

2. The long-life combined bearing for screw drill according to claim 1, characterized in that: An outer sealing ring (1) is provided between the top row inner ring (2) and the top row first half outer ring (3), and between the bottom row inner ring (13) and the bottom row second half outer ring (14).

3. The long-life combined bearing for screw drill according to claim 2, characterized in that: An inner sealing ring (11) is provided between the top row inner ring (2) and the top row second half outer ring (4), and between the bottom row inner ring (13) and the bottom row first half outer ring (12).

4. The long-life combined bearing for screw drill according to claim 1, characterized in that: The cross-section of the inner spacer (5) is a regular L-shaped structure and is made of spring steel; the end face of the horizontal side ring of the inner spacer (5) is placed in the concave ring groove or end face of the lower shaft ring (9) and the bottom row inner ring (13); the end face of the vertical side ring of the inner spacer (5) is placed in the concave ring groove or end face of the upper top row inner ring (2) and the shaft ring (9).

5. The long-life combined bearing for screw drill according to claim 1, characterized in that: The cross-section of the outer spacer (6) is an inverted L-shaped structure and is made of spring steel; the end face of the horizontal side ring of the outer spacer (6) is placed in the concave ring groove or end face of the second half outer ring (4) and the seat ring (7) in the upper top row; the end face of the vertical side ring of the outer spacer (6) is placed in the concave ring groove or end face of the seat ring (7) and the first half outer ring (12) in the lower bottom row.

6. The long-life combined bearing for screw drill according to claim 1, characterized in that: The cross-section of the outer spacer (6) is a C-shaped structure and is made of spring steel; the upper end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the second half outer ring (4) and the seat ring (7) in the upper top row; the lower end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the seat ring (7) and the first half outer ring (12) in the lower bottom row.

7. The long-life combined bearing for screw drill according to claim 1, characterized in that: The cross-section of the outer spacer (6) is a Z-shaped structure and is made of spring steel; the upper end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the second half outer ring (4) and the seat ring (7) in the upper top row; the lower end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the seat ring (7) and the first half outer ring (12) in the lower bottom row.

8. The long-life combined bearing for screw drill according to claim 1, characterized in that: The cross-section of the outer spacer (6) is an I-shaped structure and is made of spring steel; the upper end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the second half outer ring (4) and the seat ring (7) in the upper top row; the lower end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the seat ring (7) and the first half outer ring (12) in the lower bottom row.

9. The long-life combined bearing for screw drill according to claim 1, characterized in that: The cross-section of the outer spacer (6) is a linear structure and is made of spring steel; the upper end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the second half outer ring (4) and the seat ring (7) in the upper top row; the lower end ring end face of the outer spacer (6) is placed in the concave ring groove or end face of the seat ring (7) and the first half outer ring (12) in the lower bottom row.

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