Low noise bearing

Abstract

The utility model discloses a low noise bearing forms the cross roller way of the section being 90 degree right angle through the outer ring and upper and lower two layers inner ring, sets up in the cross roller way with the steel ball rolling, relative to traditional ball bearing, the roller way becomes the straight line from the circular arc, makes the envelope angle of steel ball and cross roller way significantly reduce, greatly reduces the contact area and microcosmic elastic deformation between steel ball 4 and cross roller way, reduces the friction, vibration and operating noise from the root, and the steel ball is supported in the cross roller way through point contact mode, guarantees the bearing can bear axial, radial and moment compound load at the same time, always maintains the point contact state, relative to traditional cross roller bearing, changes from line contact to point contact, avoids the problem that the friction resistance is big, easy to slide and noise sharp that line contact brings, realizes the perfect combination of high rigidity bearing and extreme silence, makes the bearing especially suitable for CT machine and other precision equipment that the requirement of the silence performance is extremely high.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology and relates to a cross roller bearing, specifically a low-noise cross raceway ball bearing. Background Technology

[0002] In the field of high-end medical imaging equipment and precision instruments such as computed tomography (CT), there are extremely stringent requirements for the quiet operation of bearings, a core component of the drive system. Excessive operating noise not only affects the patient experience but may also interfere with the accurate imaging and diagnosis of the equipment.

[0003] Currently, several technical approaches are mainly used in this field to meet the requirements for quiet operation, but all have inherent drawbacks. The first is wire raceway bearings, which, while offering some noise reduction, often have limited structural strength and load-bearing capacity, affecting equipment lifespan and stability. The second is traditional ball bearings, the most widely used solution, but their raceways are arc-shaped, forming a large envelope angle with the steel balls, resulting in a large contact area and significant micro-elastic deformation, becoming a major source of vibration and noise. The third is crossed roller bearings, which provide high rigidity and precision through the crossed arrangement of rollers, but their rolling elements and raceways have line contact, resulting in high frictional torque and sensitivity to machining errors, also easily generating vibration and noise, making them unsuitable for top-tier quiet operation scenarios.

[0004] Therefore, there is a clear contradiction in the existing technology: steel wire raceways with good noise reduction potential have insufficient mechanical properties; while crossed roller bearings with excellent mechanical properties have bottlenecks in terms of noise reduction. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a low-noise bearing that uses a cross-type raceway in conjunction with steel ball rolling elements, achieving a perfect combination of high rigidity load-bearing capacity and extreme quietness.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A low-noise bearing is characterized by comprising: an outer ring, a first inner ring, a second inner ring, steel balls, and a spacer block. The first inner ring and the second inner ring are coaxially rotatably disposed inside the outer ring to form a cross raceway with a right angle between the outer circumferential surface of the first inner ring and the second inner ring and the inner circumferential surface of the outer ring. The steel balls are rotatably disposed within the cross raceway. The spacer block is disposed at intervals with the steel balls to separate adjacent steel balls.

[0008] Furthermore, the inner circumference of the outer ring is provided with an integrally formed first V-shaped channel, and the corresponding outer circumferences of the first inner ring and the second inner ring are combined to form a second V-shaped channel. The first V-shaped channel and the second V-shaped channel are arranged opposite to each other to form a cross raceway with a right angle in cross section.

[0009] Furthermore, the two inclined surfaces of the first V-shaped channel are parallel to the two inclined surfaces of the second V-shaped channel, and the steel ball is rolled between the two sets of parallel inclined surfaces so that the steel ball rolls relative to each other in a straight line between the parallel inclined surfaces.

[0010] Furthermore, the steel ball is supported in the cross raceway by point contact, and the steel ball simultaneously forms four-point contact with the two inclined surfaces of the first V-shaped channel and the two inclined surfaces of the second V-shaped channel.

[0011] Furthermore, the spacer is a ring-shaped retainer with pockets on it that match the number of steel balls. The steel balls are partially embedded in the pockets to guide the steel balls to roll through the spacer.

[0012] Furthermore, the cross raceways are filled with lubricating grease.

[0013] Furthermore, the outer ring and / or the first inner ring are provided with oil injection holes for injecting lubricating grease into the cross raceways.

[0014] Furthermore, the bearing also includes: a first sealing strip and a second sealing strip. The first sealing strip is installed on the first inner ring and its sealing lip is pressed against the end face of the outer ring to form a seal. The second sealing strip is installed on the outer ring and its sealing lip is pressed against the end face of the second inner ring to form a seal.

[0015] Furthermore, both the sealing lips of the first and second sealing strips are provided with spiral oil return lines facing the pressing surface.

[0016] Furthermore, the first inner ring and the second inner ring are fixed together as one unit by circumferentially distributed connecting bolts to form a complete bearing inner ring.

[0017] The beneficial effects of this utility model are as follows: The low-noise bearing provided by this utility model forms a cross raceway with a cross section of 90 degrees through the outer ring and the upper and lower inner rings. Steel balls are rolled in the cross raceway. Compared with traditional ball bearings, the raceway changes from an arc to a straight line, which significantly reduces the envelope angle between the steel balls and the cross raceway. This greatly reduces the contact area and micro-elastic deformation between the steel balls and the cross raceway, thereby reducing friction, vibration and running noise at the source. The steel balls are supported in the cross raceway through point contact. While ensuring that the bearing can withstand axial, radial and torque combined loads, it always maintains a point contact state. Compared with traditional crossed roller bearings, it changes from line contact to point contact, avoiding the problems of high frictional resistance, easy slippage and sharp noise caused by line contact. It achieves a perfect combination of high rigidity and extreme quietness, making the bearing particularly suitable for precision equipment such as CT scanners with extremely high requirements for quiet performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a partial cross-sectional schematic diagram of the present invention.

[0020] Figure 3 This is a schematic diagram showing the spaced arrangement of the steel balls and isolation blocks of this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1-2 As shown, this utility model provides a low-noise bearing, including: an outer ring 1, a first inner ring 2, a second inner ring 3, steel balls 4, and a spacer block 5. The first inner ring 2 and the second inner ring 3 are coaxially rotatably disposed inside the outer ring 1, forming a cross raceway with a cross-section at a 90-degree right angle between the outer circumferential surfaces of the first inner ring 2 and the second inner ring 3 and the inner circumferential surface of the outer ring 1. The outer ring 1, the first inner ring 2, and the second inner ring 3 are all made of high-carbon chromium bearing steel and have undergone quenching and tempering treatment. Specifically, the inner circumferential surface of the outer ring 1 has an integrally formed first V-shaped groove, and the corresponding outer circumferential surfaces of the first inner ring 2 and the second inner ring 3 are joined together to form a second V-shaped groove. The first V-shaped groove and the second V-shaped groove are arranged opposite each other, together forming a cross raceway with a cross-section at a 90-degree right angle, ensuring the accuracy of the cross raceway geometry and the overall structural strength. This split groove design not only facilitates high-precision grinding and ultra-precision machining to obtain excellent surface finish to further reduce noise, but also simplifies the manufacturing process and improves production efficiency. The first inner ring 2 and the second inner ring 3 are fixed together by circumferentially distributed connecting bolts to form a complete and highly rigid bearing inner ring. This not only ensures the accuracy of the two inner rings forming the second V-shaped groove and the geometric consistency of the cross raceway, but also facilitates the installation and preload adjustment of the bearing, and improves its overall structural stability and load-bearing capacity.

[0023] The steel ball 4 is rolled within the cross raceway. The two inclined surfaces of the first V-shaped groove are parallel to the two inclined surfaces of the second V-shaped groove. The steel ball 4 is rolled between the two sets of parallel inclined surfaces, allowing it to roll relative to each other in a straight line between the parallel inclined surfaces. This optimizes the traditional circular arc raceway into a straight raceway, significantly reducing the envelope angle between the steel ball 4 and the cross raceway. This greatly reduces the contact area and micro-elastic deformation between the steel ball 4 and the cross raceway, fundamentally reducing friction, vibration, and operating noise. This makes the bearing particularly suitable for precision equipment such as CT scanners that require extremely high quiet operation. Both sets of parallel inclined surfaces are smooth surfaces that have been ground and ultra-precision treated, further reducing friction and noise.

[0024] The steel ball 4 is supported in the crossed raceway through point contact, and simultaneously forms four-point contact with the two inclined surfaces of the first V-shaped groove and the two inclined surfaces of the second V-shaped groove. This contact mode ensures that the bearing can withstand combined axial, radial, and moment loads while maintaining point contact, avoiding the problems of high frictional resistance, easy slippage, and sharp noise caused by the line contact of traditional crossed roller bearings, and achieving a perfect combination of high rigidity and extremely quiet operation.

[0025] like Figure 3 As shown, the spacer block 5 is spaced apart from the steel balls 4 to precisely and equidistantly separate adjacent steel balls 4, preventing them from colliding and rubbing against each other during operation. Specifically, the spacer block 5 is an annular cage made of wear-resistant nylon PA66 or engineering plastics such as polyetheretherketone (PEEK). The spacer block 5 has pockets matching the number of steel balls 4, with some steel balls 4 embedded in the pockets. The outline of the pockets leaves a gap between the non-contact parts of the steel balls 4 and the spacer block 5 to guide the rolling of the steel balls 4. This guiding method ensures the uniform distribution and orderly movement of the steel balls 4 in the cross raceway, which not only effectively reduces the noise generated by the vibration of the spacer block 5 itself, but also significantly improves the dynamic balance performance and operational stability of the bearing.

[0026] The crossed raceways are filled with lubricating grease, forming a complete oil film on the surfaces of the moving parts, providing lubrication, reducing friction, and minimizing wear. Simultaneously, the grease also has a damping effect, absorbing and weakening the high-frequency vibration waves generated when the steel ball 4 collides with the crossed raceways and the spacer block 5, playing a crucial supporting role in achieving low-noise operation. The lubricating grease used is a low-noise, long-life lithium-based grease or a fully synthetic grease. The outer ring 1 and / or the first inner ring 2 have oil injection holes for injecting lubricating grease into the crossed raceways, allowing for replenishment of lubrication without disassembly after long-term use. This greatly improves the maintainability and service life of the bearing, ensuring that internal lubrication is always in good condition and preventing increased noise and premature failure due to grease aging or lack of lubrication.

[0027] The crossed raceways are sealed by a first sealing strip 6 and a second sealing strip 7. The first sealing strip 6 is installed on the first inner ring 2, and its sealing lip presses against the end face of the outer ring 1 to form a seal. The second sealing strip 7 is installed on the outer ring 1, and its sealing lip presses against the end face of the second inner ring 3 to form a seal. This constitutes a highly efficient multi-seal system that effectively prevents external contaminants (such as dust and moisture) from entering the crossed raceways, while also preventing internal lubricating grease leakage. This provides a clean and reliable sealed environment for the bearing's low-noise, long-life operation. Both the sealing lips of the first sealing strip 6 and the second sealing strip 7 are provided with spiral oil return lines facing the pressing surface. When the bearing is running, these oil return lines generate a pumping effect, pumping any grease attempting to leak outwards back into the bearing. While ensuring a good sealing effect, this greatly reduces frictional resistance and lip wear, further improving the reliability and durability of the seal.

[0028] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A low-noise bearing, characterized in that, include: Outer ring (1), first inner ring (2), second inner ring (3), steel ball (4), and isolation block (5). The first inner ring (2) and the second inner ring (3) are coaxially rotatably arranged inside the outer ring (1) to form a cross raceway with a cross section of 90 degrees between the outer circumferential surface of the first inner ring (2) and the second inner ring (3) and the inner circumferential surface of the outer ring (1). The steel ball (4) is rolled in the cross raceway. The isolation block (5) is spaced apart from the steel ball (4) to separate adjacent steel balls (4).

2. The bearing according to claim 1, characterized in that, The outer ring (1) has an integrally formed first V-shaped groove on its inner circumference surface. The corresponding outer circumference surfaces of the first inner ring (2) and the second inner ring (3) are combined to form a second V-shaped groove. The first V-shaped groove and the second V-shaped groove are arranged opposite to each other to form a cross raceway with a cross section at a right angle of 90 degrees.

3. The bearing according to claim 2, characterized in that, The two inclined surfaces of the first V-shaped channel are parallel to the two inclined surfaces of the second V-shaped channel, and the steel ball (4) is rolled between the two sets of parallel inclined surfaces so that the steel ball (4) rolls relative to each other in a straight line between the parallel inclined surfaces.

4. The bearing according to claim 3, characterized in that, The steel ball (4) is supported in the cross raceway by point contact, and the steel ball (4) simultaneously forms four-point contact with the two inclined surfaces of the first V-shaped channel and the two inclined surfaces of the second V-shaped channel.

5. The bearing according to claim 1, characterized in that, The isolation block (5) is an annular retainer. The isolation block (5) has pockets that match the number of steel balls (4). The steel balls (4) are partially embedded in the pockets so as to guide the steel balls (4) to roll through the isolation block (5).

6. The bearing according to claim 1, characterized in that, The cross raceways are filled with lubricating grease.

7. The bearing according to claim 6, characterized in that, The outer ring (1) and / or the first inner ring (2) are provided with oil injection holes for injecting lubricating grease into the cross raceway.

8. The bearing according to claim 6, characterized in that, Also includes: The first sealing strip (6) and the second sealing strip (7) are installed on the first inner ring (2) and their sealing lips are pressed against the end face of the outer ring (1) to form a seal. The second sealing strip (7) is installed on the outer ring (1) and its sealing lips are pressed against the end face of the second inner ring (3) to form a seal.

9. The bearing according to claim 8, characterized in that, Both the sealing lips of the first sealing strip (6) and the second sealing strip (7) are provided with spiral oil return lines facing the pressing surface.

10. The bearing according to claim 1, characterized in that, The first inner ring (2) and the second inner ring (3) are fixed together by circumferentially distributed connecting bolts to form a complete bearing inner ring.

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