Ultra-high-speed bearing

Abstract

An ultra-high-speed bearing, comprising rolling elements, a cage, an inner ring, an outer ring, and cooling grooves. The rolling elements are placed on the cage; inner and outer raceways are provided on opposite sides of the inner ring and the outer ring; the inner and outer raceways cooperate to clamp and limit the movement of the rolling elements within the raceways; the plurality of cooling grooves are arranged spaced apart on the outer diameter of the outer ring; a coolant is provided in the cooling grooves and circulates with the external environment; and the heat generated by the high-speed rotation of the rolling elements is transferred from the inner diameter to the outer diameter of the outer ring and is cooled down by the coolant in the cooling grooves. The invention is cleverly designed, has a simple structure, is convenient and practical, and can quickly and effectively remove the heat from the outer ring, thus reducing the temperature rise and improving the ultra-high-speed performance of the bearing.

Description

An ultra-high-speed bearing Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to an ultra-high-speed bearing. Background Art

[0002] The dm×n value of the ultra-high-speed bearing in operation reaches 4.5×10 6 When the speed reaches 0.1333 rpm, the centrifugal force of the rolling elements reduces the contact force between the rolling elements and the inner ring, while the contact force with the outer ring increases significantly, which seriously aggravates the friction and generates very large frictional heat. If the bearing is not cooled in time, it will burn and fail. It is difficult to achieve ultra-high-speed and stable operation of the bearing using oil mist or oil-gas lubrication. Therefore, frictional heat generation in ultra-high-speed bearings is a technical problem that needs to be solved by those skilled in the art.

[0003] How to design an ultra-high-speed bearing with ingenious design, simple structure, convenience and practicality, which can quickly and effectively take away the heat of the outer ring, reduce temperature rise, and improve the ultra-high-speed performance of the bearing is a problem that needs to be solved at present. Summary of the Invention

[0004] In order to solve the problems that occur in existing ultra-high-speed bearings when reaching a certain ultra-high speed rating, the contact force between the rolling elements and the inner ring decreases due to centrifugal force, while the contact force with the outer ring increases significantly, seriously aggravating friction, generating very large frictional heat, and easily causing bearing burns and failure. Even if traditional oil mist or oil-gas lubrication is used, it is difficult to achieve ultra-high-speed stable operation of the bearing. The present invention provides an ultra-high-speed bearing with an ingenious design, simple structure, convenience and practicality, which can quickly and effectively remove heat from the outer ring, reduce temperature rise, and improve the ultra-high-speed performance of the bearing.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an ultra-high-speed bearing, including rolling elements, an inner ring of a cage, an outer ring and a cooling groove, the rolling elements are placed on the cage, and inner and outer raceways are provided on opposite sides of the inner ring and the outer ring, and the inner and outer raceways cooperate to clamp and limit the movement of the rolling elements in the raceways; a plurality of cooling grooves are arranged at intervals on the outer diameter of the outer ring, and a coolant is provided in the cooling grooves, and the coolant circulates with the outside, and the heat generated by the high-speed operation of the rolling elements is transferred from the inner diameter to the outer diameter of the outer ring, and is cooled by the coolant in the cooling grooves.

[0006] As a further optimization solution for the above-mentioned ultra-high-speed bearing, the number of the cooling grooves is four, and the positions of the four cooling grooves are symmetrical with respect to the center line of the outer ring width.

[0007] As a further optimization solution for the above-mentioned ultra-high-speed bearing, the opening shape of the cooling groove is rectangular or isosceles trapezoidal.

[0008] As a further optimization solution for the above-mentioned ultra-high-speed bearing, the coolant is made of a liquid with a large specific heat capacity, so as to facilitate the rapid transfer of heat from the outer ring to the outside.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The present invention includes rolling elements, a cage inner ring, an outer ring, and cooling grooves. The rolling elements are placed on the cage, and inner and outer raceways are provided on opposite sides of the inner and outer rings. The inner and outer raceways cooperate to clamp and limit the movement of the rolling elements within the raceways. Multiple cooling grooves are provided at intervals on the outer diameter of the outer ring. Coolant is provided in the cooling grooves and circulates with the outside. The heat generated by the high-speed operation of the rolling elements is transferred from the inner diameter to the outer diameter of the outer ring and is cooled by the coolant in the cooling grooves.

[0011] 2. The main innovation of the present invention is that a plurality of cooling grooves for external circulation are arranged at intervals on the outer diameter of the outer ring. The coolant in the cooling grooves can quickly and effectively remove the heat of the outer ring, reduce the temperature rise, and improve the ultra-high-speed performance of the bearing.

[0012] 3. A groove wall of a certain width is set between each adjacent groove to ensure the strength of the working outer ring.

[0013] 4. The opening shape of the cooling groove is rectangular or isosceles trapezoidal. The rectangular or isosceles trapezoidal opening shape can maximize the heat conduction area of ​​the outer diameter of the outer ring.

[0014] 5. The coolant is made of a liquid with a large specific heat capacity, so as to facilitate the rapid transfer of heat from the outer ring to the outside. This cooling method is simple in structure, effective and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of the three-dimensional structure of the present invention;

[0016] FIG2 is a half-cut perspective schematic diagram of the present invention;

[0017] FIG3 is a schematic diagram of the longitudinal cross-section structure of the present invention;

[0018] Markings in the figure: 1. Rolling element, 2. Cage, 3. Inner ring, 4. Outer ring, 5. Cooling groove. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] As shown in Figures 1 and 2, Figure 1 is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a schematic diagram of a half-section three-dimensional structure of the present invention. An ultra-high-speed bearing includes a rolling element 1, a retainer 2, an inner ring 3, an outer ring 4, and a cooling groove 5. The rolling element 1 is mounted on the retainer 2. Inner and outer raceways are provided on opposite sides of the inner ring 3 and the outer ring 4. The inner and outer raceways cooperate to clamp and limit the movement of the rolling element 1 within the raceway. A plurality of cooling grooves 5 are provided at intervals on the outer diameter of the outer ring 4. The cooling grooves 5 contain coolant, which circulates with an external circuit. The external circuit can be operated in a manner in which a fixed chamber surrounds the outer ring, the fixed chamber and the outer ring are fixed as a whole, and the inner ring rotates at high speed. The heat generated by the high-speed operation of the rolling element 1 is transferred from the inner diameter to the outer diameter of the outer ring 4 and is cooled by the coolant in the cooling grooves 5.

[0021] As shown in FIG3 , which is a schematic diagram of the longitudinal cross-section structure of the present invention, there are four cooling slots 5 , which are positioned symmetrically relative to the width centerline of the outer ring 4 . The opening shape of the cooling slots 5 is rectangular or isosceles trapezoidal.

[0022] The coolant is made of a liquid with a large specific heat capacity, so as to facilitate the rapid transfer of heat from the outer ring 4 to the outside.

[0023] The external circulation can adopt the method of wrapping the outer ring with a fixed chamber. The fixed chamber and the outer ring are fixed as a whole, and the inner ring rotates at high speed.

[0024] In actual application, taking the 7208 bearing shown in Figure 3 as an example, the bearing includes an inner ring 3, an outer ring 4, a rolling element 1, and a retainer 2. The bearing has an inner diameter of φ40 mm, an outer diameter of φ80 mm, a width of 18 mm, and a ball diameter of 12.303 mm.

[0025] To ensure the strength of the outer ring after the grooves are set, four cooling grooves 5 with the same width and depth are designed on its outer diameter surface symmetrically with the center line of the outer ring width, such as the cooling groove 5 in Figure 3. A groove wall of a certain width is set between each adjacent cooling groove 5. The groove width B = 2.5mm, the adjacent groove wall width b = 1.5mm, and the depth Hc = 2mm. Among them, 4B + 3b = 14.5mm is larger than the diameter of the steel ball (rolling element 1) of 12.303mm. After simulation calculation, the strength of the outer ring meets the design requirements.

[0026] The bearing adopts the above technical solution, which can effectively reduce the temperature rise during ultra-high-speed bearing operation and ensure the operating performance of the bearing.

[0027] In practical applications, the opening shape of the cooling groove 5 can also be adjusted to an isosceles trapezoidal shape that is easy to dissipate heat according to heat dissipation requirements. The cooling groove 5 of the present invention is not limited to the above shape.

[0028] The present invention has an ingenious design, a simple structure, is convenient and practical, can quickly and effectively remove heat from the outer ring, reduce temperature rise, and improve the ultra-high-speed performance of the bearing. It solves the problem that when a certain ultra-high speed rating is reached in existing ultra-high-speed bearings, the contact force between the rolling element and the inner ring decreases due to the action of centrifugal force, while the contact force with the outer ring increases significantly, seriously aggravating friction, generating very large frictional heat, and easily causing bearing burns and failures. Even if traditional oil mist or oil-gas lubrication is used, it is difficult to achieve ultra-high-speed stable operation of the bearing. Compared with the existing technology, it has good market prospects and development space.

[0029] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes and embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the concept of the present invention.

Claims

1. A super-high-speed bearing, characterized in that: It includes rolling elements (1), a cage (2), an inner ring (3), an outer ring (4) and cooling grooves (5). The rolling elements (1) are placed on the cage (2). Inner and outer raceways are provided on the opposite sides of the inner ring (3) and the outer ring (4). The inner and outer raceways cooperate to clamp and limit the movement of the rolling elements (1) within the raceways. A plurality of cooling grooves (5) are spaced on the outer diameter of the outer ring (4). A coolant is provided in the cooling grooves (5), and the coolant circulates externally. The heat generated by the high-speed rotation of the rolling elements (1) is transferred from the inner diameter to the outer diameter of the outer ring (4) and cooled by the coolant in the cooling grooves (5).

2. A super-high-speed bearing according to claim 1, characterized in that: The number of the cooling grooves (5) is four, and the positions of the four cooling grooves (5) are symmetric about the width center line of the outer ring (4).

3. A super-high-speed bearing according to claim 1, characterized in that: The opening shape of the cooling groove (5) is a rectangle or an isosceles trapezoid.

4. A super-high-speed bearing according to claim 1, characterized in that: The material of the coolant is a liquid with a large specific heat capacity to facilitate the rapid transfer of heat on the outer ring (4) to the outside.

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