Conical roller bearing

Abstract

The utility model discloses a special-shaped conical roller bearing, including bearing outer ring, bearing inner race, retainer and the rolling body of movable setting between bearing outer ring and bearing inner race, the bearing outer ring is sleeved on bearing inner race and is formed with the open containing space of the clearance cooperation of bearing outer ring inner peripheral wall and bearing inner race outer peripheral wall for the accommodation of rolling body and retainer, the axial both sides of open containing space are through -type structure to form the installation channel for the installation of rolling body and retainer, the inner peripheral wall of bearing outer ring and bearing inner race outer peripheral wall all form the raceway for the movement of rolling body, the included angle between the normal line of raceway and axis is contact angle, the radial section shape of bearing outer ring and bearing inner race is the geometry shape for making contact angle inhabit the preset angle interval and mutually adapt. The utility model has solved the problem of traditional general angle contact ball bearing load deficiency, ordinary conical roller bearing contact angle small and inconvenient installation and disassembly.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to a special-shaped tapered roller bearing. Background Technology

[0002] In applications with limited internal cross-sectional space, such as industrial robot joints, rotary platforms, and machine tool turntables, the compact overall structure of some equipment results in very limited internal space to accommodate bearings. This places clear demands on the comprehensive performance of the bearings: on the one hand, they must withstand combined radial and axial loads to cope with multi-directional forces during equipment operation; on the other hand, they must be compatible with high operating speeds to ensure efficient equipment operation. Furthermore, they must possess convenient installation and disassembly characteristics and allow for a certain degree of displacement due to thermal expansion during operation to prevent shaft deformation from affecting normal bearing operation and equipment stability.

[0003] However, existing bearing structures cannot fully meet the above requirements: conventional angular contact ball bearings can be used in some scenarios, but their load-bearing capacity is insufficient and cannot meet the requirements of composite loads; while ordinary tapered roller bearings not only have a small contact angle (usually only 10 to 20 degrees), making it difficult to balance radial and axial forces, but also only the outer ring of the bearing can be separated, and its inner ring has large and small flanges, which makes it difficult to easily separate the rolling elements and cage assembly from the inner ring, making installation and disassembly inconvenient. At the same time, it requires precise preload to work properly, and cannot allow the shaft to move due to thermal expansion, and its speed adaptability is also relatively poor. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a special-shaped tapered roller bearing, which solves the problems of insufficient load capacity of traditional conventional angular contact ball bearings, small contact angle of ordinary tapered roller bearings, and inconvenience in installation and disassembly.

[0005] To achieve the above objectives, this utility model provides a non-circular tapered roller bearing, comprising an outer ring, an inner ring, a cage, and rolling elements movably disposed between the outer and inner rings. The outer ring is fitted onto the inner ring, and a clearance fit between the inner and outer walls of the outer and inner rings forms an open accommodating space for accommodating the rolling elements and the cage. The axial sides of the open accommodating space are through-type structures to form installation channels for mounting the rolling elements and the cage. Both the inner and outer walls of the outer and inner rings have raceways for the movement of the rolling elements. The angle between the normal of the raceway and the axis is the contact angle. The radial cross-sectional shapes of the outer and inner rings are geometric shapes designed to ensure that the contact angles are within a preset angle range and are mutually compatible.

[0006] The advantages of adopting the above technical solution are as follows: the collaborative structure of the bearing outer ring, bearing inner ring, cage, and rolling elements in the above technology enables orderly assembly of components; the innovatively designed open accommodating space can reasonably accommodate the rolling elements and cage, avoiding movement obstruction caused by component congestion during assembly, and the through-type installation channel breaks through the limitations of traditional closed or semi-closed accommodating structures of bearings, greatly simplifying the installation process of rolling elements and cages, allowing assembly to be completed without complex disassembly, reducing operational difficulty; the raceway provides a stable motion trajectory for the rolling elements, reducing frictional losses caused by motion deviation, and the adaptive design of the radial cross-sections of the inner and outer rings can precisely control the contact angle within a preset range, enabling the bearing to have both radial and axial load-bearing capacity, breaking through the load-bearing limitations of traditional single radial or thrust bearings, meeting the requirements of composite loads, and the overall structure does not require excessive additional space, making it suitable for narrow cross-section scenarios such as industrial robot joints and rotating platforms, ensuring the compactness of the equipment structure.

[0007] The present invention further comprises: the radial cross-sections of the outer ring and the inner ring of the bearing are arranged in an equilateral right triangle.

[0008] The advantages of adopting the above technical solution are as follows: The innovative design of the radial cross-section of the bearing outer and inner rings using equilateral right-angled triangles ensures symmetrical structure and high adaptability of the inner and outer rings, avoiding assembly deviations caused by traditional asymmetrical cross-sections and improving assembly accuracy. At the same time, the equilateral right-angled triangle can accurately match the preset contact angle requirements, ensuring balanced bearing capacity of the bearing for radial and axial forces, avoiding uneven stress caused by unreasonable cross-sectional shape, reducing local wear, and extending service life. In addition, the processing flow of this cross-sectional shape is simpler, reducing the processing difficulty of the inner and outer rings, facilitating the control of processing consistency, and the symmetrical structure during operation makes the stress distribution more uniform, improving the bearing's operational stability, adapting to long-term high-frequency operation of equipment, and overcoming the problems of complex processing and unbalanced stress in traditional cross-sections.

[0009] The present invention is further configured such that the contact angle is set at 45 degrees.

[0010] The advantages of adopting the above technical solution are as follows: The innovative setting of the contact angle with a specific angle enables the bearing to achieve a balanced state in radial and axial load, breaking through the limitations of traditional methods where an excessively small contact angle leads to insufficient axial load and an excessively large contact angle leads to a decrease in radial performance, thus ensuring that the bearing can stably withstand composite loads; This angle design can optimize the contact state between the rolling elements and the raceway, reduce stress concentration in the contact area, reduce rolling friction loss, and improve operating efficiency; At the same time, it adapts to the movement trajectory of the rolling elements, avoiding movement jamming caused by improper contact angle, making the rolling elements move more smoothly, reducing vibration and noise, and improving the quietness of equipment operation; It can also adapt to higher speed requirements, breaking through the problem of speed limitation under traditional contact angles, ensuring stable load-bearing performance under high-speed operation, and meeting the needs of efficient equipment operation.

[0011] The present invention further comprises: the rolling element being composed of several cylindrical rollers.

[0012] The advantages of adopting the above technical solution are: the innovative choice of cylindrical rollers as rolling elements in the above technology is different from the tapered rollers of traditional tapered roller bearings. The cylindrical structure can increase the contact length with the raceway, so that the force is evenly transmitted to the inner and outer rings, reducing local contact stress and reducing the wear rate. Moreover, the structural characteristics of cylindrical rollers make their movement guidance in the raceway better, avoiding the deviation or jamming that is prone to occur with tapered rollers, and improving the smoothness of operation.

[0013] The present invention is further provided in that: the retainer is provided with a plurality of pockets for accommodating cylindrical rollers, and the retainer is a nylon retainer or a steel stamped retainer.

[0014] The advantages of adopting the above technical solution are as follows: the innovative choice of cage material offers several advantages: when using nylon, its lightweight properties reduce the overall weight of the bearing, decrease inertial forces, and overcome the speed limitation caused by the heavy weight of steel cages. Furthermore, nylon possesses excellent wear resistance and corrosion resistance, reducing frictional losses. Conversely, when using a stamped steel cage, its high strength enhances load-bearing capacity, overcoming the limitation of nylon cages being prone to deformation under high loads, making it suitable for high-load operating scenarios and ensuring stable operation under high loads. Through the selection of these materials, the adaptability and practicality of the structure are improved.

[0015] This utility model further includes the following configuration: spacer rings are provided on both sides of the outer ring and the inner ring of the bearing. Each spacer ring is composed of a connecting part and a bending part. The connecting part on the outer ring of the bearing is detachably connected to the outer ring, and the connecting part on the inner ring is detachably connected to the inner ring. The bending part is made of shape memory alloy. The bending part has a first shape in a first temperature range and a second shape in a second temperature range. In the first shape, the inner wall of the bending part is attached to the outer wall of the connecting part. In the second shape, the bending part is deformed and bends towards the installation channel and is inclined relative to the connecting part.

[0016] The advantages of adopting the above technical solution are as follows: The innovative choice of shape memory alloy as the material for the bending section enables it to adapt to temperature. In the first temperature range (i.e., when the bearing is not running or the temperature gradually decreases to below 35 degrees Celsius), its first shape reduces the space occupied by the spacer ring, making it suitable for confined installation environments. In the second temperature range (when the bearing is running and the temperature gradually increases to above 35 degrees Celsius), its second shape enhances the limiting effect, preventing component loosening or roller slippage during high-speed bearing operation. The shape memory alloy material properties allow the bending section to automatically adjust its shape according to temperature without manual intervention, overcoming the limitations of traditional spacers in adapting to temperature fluctuations, improving the bearing's adaptability to temperature changes, and ensuring stable operation under different temperature environments. Since shape memory alloy is existing technology, its structure and function will not be described in detail here. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention in its non-operational state; Figure 2 for Figure 1 A magnified view of part A in the middle; Figure 3 for Figure 2 A simplified view of the running status; Figure 4 This is a schematic diagram of the contact angle in this utility model, where α is the contact angle. Detailed Implementation

[0018] This utility model provides a non-circular tapered roller bearing, including an outer ring 1, an inner ring 2, a cage 11, and rolling elements movably disposed between the outer ring 1 and the inner ring 2. The outer ring 1 is fitted onto the inner ring 2, and the inner circumferential wall of the outer ring 1 and the outer circumferential wall of the inner ring 2 form an open accommodating space 13 for accommodating the rolling elements and the cage 11 through the axial sides of the open accommodating space 13 to form an installation channel 131 for mounting the rolling elements and the cage 11. Both the inner circumferential wall of the outer ring 1 and the outer circumferential wall of the inner ring 2 have raceways 21 for the movement of the rolling elements. The angle between the normal of the raceway 21 and the axis is the contact angle. The radial cross-sectional shapes of the outer ring 1 and the inner ring 2 are geometric shapes designed to ensure that the contact angle is within a preset angle range and mutually compatible. The radial cross-sections of the outer ring 1 and the inner ring 2 are arranged in equilateral right triangles. The angle of the contact angle... The bearing is set at a 45-degree angle. The rolling element is composed of several cylindrical rollers 12. The cage 11 has several pockets for accommodating the cylindrical rollers 12. The cage 11 is a nylon cage or a stamped steel cage. Spacer rings 3 are provided on both sides of the outer ring 1 and the inner ring 2. The spacer rings 3 are connected by a connecting part 31 and a bending part 32. The connecting part 31 on the outer ring 1 is detachably connected to the outer ring 1. The connecting part 31 on the inner ring 2 is detachably connected to the inner ring 2. The bending part 32 is made of shape memory alloy. The bending part 32 has a first shape in a first temperature range and a second shape in a second temperature range. In the first shape, the inner wall of the bending part 32 is attached to the outer wall of the connecting part 31. In the second shape, the bending part 32 is deformed and bent towards the mounting channel 131 and is inclined relative to the connecting part 31.

[0019] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A special-shaped tapered roller bearing, characterized in that: The bearing includes an outer ring, an inner ring, a cage, and rolling elements movably disposed between the outer and inner rings. The outer ring is fitted onto the inner ring, and a clearance fit between the inner and outer walls of the outer and inner rings forms an open accommodating space for accommodating the rolling elements and the cage. The open accommodating space has a through-type structure on both axial sides to form an installation channel for mounting the rolling elements and the cage. Both the inner and outer walls of the outer and inner rings have raceways for the movement of the rolling elements. The angle between the normal of the raceway and the axis is the contact angle. The radial cross-sectional shapes of the outer and inner rings are geometric shapes designed to ensure that the contact angle is within a preset angle range and is mutually compatible.

2. The irregular tapered roller bearing according to claim 1, characterized in that: The radial sections of the outer and inner rings of the bearing are arranged in an equilateral right-angled triangle.

3. The irregular tapered roller bearing according to claim 1, characterized in that: The contact angle is set at 45 degrees.

4. A special-shaped tapered roller bearing according to claim 1, characterized in that: The rolling element is composed of several cylindrical rollers.

5. A special-shaped tapered roller bearing according to claim 4, characterized in that: The cage has several pockets for accommodating cylindrical rollers, and the cage is a nylon cage or a steel stamped cage.

6. A tapered roller bearing according to claim 1, characterized in that: Spacer rings are provided on both sides of the outer ring and the inner ring of the bearing. Each spacer ring is composed of a connecting part and a bending part. The connecting part on the outer ring is detachably connected to the outer ring, and the connecting part on the inner ring is detachably connected to the inner ring. The bending part is made of shape memory alloy. The bending part has a first shape in a first temperature range and a second shape in a second temperature range. In the first shape, the inner wall of the bending part is attached to the outer wall of the connecting part. In the second shape, the bending part is deformed and bends towards the mounting channel and is inclined relative to the connecting part.

Images