Long-life combined bearing of screw drill

Abstract

The long-life combination 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 utility model relates to the technical field of bearings, in particular to a long-life combined bearing for a screw drill. Background Art

[0002] Existing multi-row thrust ball bearings cannot be used in screw drills because the drive shaft assembly housing requires the bearings for positioning. Existing multi-row ball bearings are ineffective at positioning. Existing string bearings can provide positioning, but their service life is limited to just over 100 hours. We needed to develop a combined bearing that would both provide positioning and extend bearing life. Utility Model Content

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

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a long-life combined bearing for screw drill tools, comprising 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 comprises a connected top row inner ring, a top row first half outer ring, a top row second half outer ring and the steel balls therebetween; the bottom row part comprises a connected bottom row inner ring, a bottom row first half outer ring, a bottom row second half outer ring and the steel balls therebetween; the middle row part comprises a connected inner spacer ring, an outer spacer ring, a shaft ring, a seat ring and the steel balls therebetween.

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

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

[0007] Furthermore, the cross-section of the inner spacer is a positive L-shaped structure, and the material is spring steel; the horizontal side ring end face of the inner spacer 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 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 is an inverted L-shaped structure, and the material is spring steel; the end face of the horizontal side 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 vertical side 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.

[0009] Furthermore, the cross-section of the outer spacer is a C-shaped structure and the material is spring steel; the upper end ring end face 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 lower end ring end face 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 upper end ring end face 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 lower end ring end face 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 upper end ring end face 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 lower end ring end face 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 upper end ring end face 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 lower end ring end face 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 utility model 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, thereby increasing 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 This is a schematic diagram of the outer spacer structure of the inverted L-shaped cross section of the utility model. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the outer spacer structure of the inverted L-shaped cross section of the utility model. Figure 2 ;

[0016] Figure 3 This is a schematic diagram of the outer spacer structure of the inverted L-shaped cross section of the utility model. Figure 3 ;

[0017] Figure 4 This is a schematic diagram of the structure of the outer spacer ring of the C-shaped cross section of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the outer spacer ring with a Z-shaped cross section of the utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the outer spacer ring with a straight cross section of the utility model;

[0020] Figure 7 It is a schematic diagram of the structure of the I-section outer spacer of the utility model.

[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 methods of the present utility model are further described.

[0023] A long-life combined bearing for screw drilling tools includes 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 includes a top row inner ring 2, a top row first half outer ring 3, a top row second half outer ring 4 and the steel balls 10 therebetween; the bottom row part includes a bottom row inner ring 13, a bottom row first half outer ring 12, a bottom row second half outer ring 14 and the steel balls 10 therebetween; the middle row part includes an inner spacer 5, an outer spacer 6, a shaft ring 9, a seat ring 7 and the 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 L-shaped inner and outer spacers 5 and 6 have different cross-sectional dimensions. This allows the axial force acting on the bearing to be distributed to each row of ball bearings using elasticity variables. The force applied to each row is determined by the dimensions and elasticity variables of the inner and outer spacers. Two configurations are possible: one in which the outer spacer 6 has a thinnest cross-sectional area at the top and gradually increases in thickness, reaching the thickest section in the last row. The cross-sectional thickness of the inner spacer 5 is greater than the thickest section of the outer spacer 6. The other in which the inner spacer 5 has a thinnest cross-sectional area at the top and gradually increases in thickness, reaching the thickest section in the last row. The outer spacer 6 is thicker than the thickest section of the inner spacer 5.

[0029] The cross-section of the outer spacer 6 is a C-shaped structure, and the material is 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 bottom row.

[0030] The cross-section of the outer spacer 6 is a Z-shaped structure, and the material is 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 bottom row.

[0031] The cross-section of the outer spacer 6 is an I-type structure, and the material is 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 bottom row.

[0032] 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 bottom row.

[0033] The inner spacer 5 and the outer spacer 6 are made of spring steel. After the bearing is assembled and tightened, 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 the two 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 determines the distribution of the axial force. This can be distributed evenly or unevenly within each layer, depending on the size of the steel balls 10. The greater the number of rows, the greater the total axial force the bearing can bear. By distributing the total axial force, the bearing's service life is multiplied.

[0036] This bearing consists of a four-point contact ball bearing, a thrust ball bearing, and a spacer ring. The four-point contact ball bearings at each end of the bearing are radial and cannot be changed. The remaining center section is a multi-row thrust ball bearing with two or more rows. The current diagram shows a three-row thrust ball bearing, but two-, four-, five-, or other multi-row thrust ball bearings are also possible. The number of rows in the thrust ball bearing is determined by the operating load.

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of 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 by: 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) 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) and a steel ball (10) therebetween; the middle row part comprises an inner spacer (5), an outer spacer (6), a shaft ring (9), a seat ring (7) and a steel ball (10) therebetween; 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); 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).

2. 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 horizontal side ring end face 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 vertical side ring end face 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).

3. 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.

4. 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.

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 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.

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 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.

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 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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