Dental pistol bearing

Abstract

The invention relates to the technical field of bearings, and discloses a dental pistol bearing which comprises an outer ring and an inner ring, a center ring is arranged between the outer ring and the inner ring, a raceway is arranged between the center ring and the inner ring, inner layer balls are arranged in the raceway in a rolling mode, a raceway is arranged between the outer ring and the center ring, outer layer balls are arranged in the raceway in a rolling mode, and the outer layer balls are arranged in the raceway in a rolling mode. The center ring is additionally arranged between the outer ring and the inner ring and used for providing an additional raceway, then the outer-layer balls located on the outer layer are arranged, when the bearing works, the inner ring is driven by a workpiece to rotate at a high speed, the inner-layer balls are stressed to roll in the raceway, part of force is transmitted to the center ring, and the center ring starts to rotate; and a part of friction and kinetic energy are transmitted to the outer-layer balls between the central ring and the outer ring, so that the friction borne by the inner-layer balls and the force acting on the inner-layer balls are reduced, the service life of the inner-layer balls is prolonged, and the service life of the whole bearing is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, in particular to a dental pistol bearing. Background Art

[0002] Dental pistol bearings are vital components in dental surgery. Dental pistol bearings are usually composed of inner rings, outer rings, rolling elements (balls) and cages. Among them, the inner ring and outer ring are made of refined stainless steel (such as 440 stainless steel), and the rolling elements are made of high-precision stainless steel or ceramics (such as Si3N4) according to requirements to maintain their high strength, corrosion resistance and wear resistance. The cage is made of reinforced phenolic resin (such as TORLON) or phenolic resin (such as PEEK) and other materials to provide high strength, low friction and self-lubrication. Its performance directly affects the surgical efficiency, noise level and the service life of the bearing. Dental pistol bearings in the prior art need to withstand higher rotation speeds, and the friction between the roller surface and the groove surface is higher than that of low-speed bearings. They are prone to wear after long-term use and have low strength. Therefore, how to solve the above problems is particularly critical. Summary of the invention

[0003] The object of the present invention is to provide a dental pistol bearing to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dental pistol bearing, comprising an outer ring and an inner ring, a center ring is arranged between the outer ring and the inner ring, a raceway is arranged between the center ring and the inner ring, and an inner layer of balls is arranged to roll in the raceway, a raceway is arranged between the outer ring and the center ring, and an outer layer of balls is arranged to roll in the raceway, a plurality of outer layer of balls are arranged, and an outer layer of the outer layer of balls is provided with an outer layer of retaining frame for an outer layer of the outer layer of balls, and an inner layer of the inner layer of balls is provided with an inner layer of retaining frame for an outer layer of the inner layer of balls, both the outer layer of retaining frame and the inner layer of retaining frame are circular chain, an outer support body is arranged on the outer side of the outer ring, the outer support body surrounds the outer ring, and the outer support body is fixedly mounted on the outer ring.

[0005] Furthermore, the outer layer balls and the inner layer balls have the same specifications, and the number of the outer layer balls is greater than the number of the inner layer balls.

[0006] Furthermore, the outer layer balls and the inner layer balls are both made of silicon nitride ceramics, the main bodies of the outer layer retaining frame and the inner layer retaining frame are made of polyamide nylon material, and the front and rear parts of the outer layer retaining frame and the inner layer retaining frame are connected by aluminum alloy rivets.

[0007] Furthermore, the outer support body is made of titanium alloy, and the outer support body is composed of bosses, and the gaps between adjacent bosses are in a semicircular arc shape.

[0008] Furthermore, the outer ring includes an alloy substrate, an anti-corrosion layer 1, and a wear-resistant layer 1. The anti-corrosion layer 1 is arranged on the outer layer of the alloy substrate, and the wear-resistant layer 1 is arranged on the inner layer of the alloy substrate.

[0009] Furthermore, the center ring includes a nano matrix, a second wear-resistant layer, and a third wear-resistant layer. The second wear-resistant layer is arranged on the outer layer of the nano matrix, and the third wear-resistant layer is arranged on the inner layer of the nano matrix.

[0010] Furthermore, the inner ring includes a ceramic matrix, a fourth wear-resistant layer, and a second anti-corrosion layer. The fourth wear-resistant layer is arranged on the outer layer of the ceramic matrix, and the second anti-corrosion layer is arranged on the inner layer of the ceramic matrix.

[0011] Furthermore, lubrication grooves are provided on the front and back sides of the center ring, a porous ceramic ring is fixedly installed inside the lubrication groove, a connecting hole is provided inside the lubrication groove, a circulation hole is provided on the center ring, the circulation hole connects the inner and outer sides of the center ring, and the circulation hole is connected to the connecting hole.

[0012] Furthermore, bearing covers are provided on the front and back sides of the outer ring, the center ring and the inner ring, a clamping ring is fixedly provided on the outer wall of the bearing cover facing the center ring, the clamping ring buckle is arranged in the lubrication groove, and the bearing cover is made of die-cast aluminum alloy.

[0013] Furthermore, the connection between the clamping ring and the bearing cover is rounded, and an outer wall of the bearing cover facing the outer ring is provided with an integrally formed semicircular protrusion.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Add a center ring between the outer ring and the inner ring to provide an additional raceway, and then set the outer layer balls on the outer layer. When the bearing is working, the inner ring is driven by the workpiece to rotate at high speed, so that the inner layer balls are subjected to force and roll in the raceway. Part of the force will be transmitted to the center ring, causing the center ring to start rotating, and part of the friction and kinetic energy will be transmitted to the outer layer balls between the center ring and the outer ring, thereby reducing the friction of the inner layer balls and the force acting on the inner layer balls, and prolonging the service life of the inner layer balls, thereby prolonging the service life of the overall bearing; 2. An outer support body is arranged outside the outer ring to support the outer ring and constrain the outer ring to prevent deformation of the outer ring under high temperature and high pressure environment, and to form a partition between the outer ring and the installation part to reduce the probability of deformation of the outer ring under stress. An outer cage and an inner cage are arranged on the outer layer balls and the inner layer balls respectively, and the outer layer balls and the inner layer balls are separated by equal distances and evenly distributed on the circumference of the raceway to prevent collision and friction between the outer layer balls and between the inner layer balls during operation, so as to ensure the normal operation of the bearing; 3. The outer cage and the inner cage wrap the outer balls and the inner balls to prevent them from direct contact with the rolling elements, reduce friction and heat generation to a minimum, thereby extending the service life of the bearing, and guide the outer balls and the inner balls to roll on the correct raceway to ensure the smooth operation of the bearing. The outer cage and the inner cage form a gap between the outer balls and the inner balls to provide space for lubricants, which helps to improve the lubrication performance of the bearing. By evenly distributing the outer balls and the inner balls, the outer cage and the inner cage can improve the load distribution inside the bearing, so that the bearing bears a more uniform load and improves the load-bearing capacity; 4. A porous ceramic ring is provided for storing lubricating oil. The holes on the porous ceramic ring are used to slowly release the lubricating oil. The lubricating oil flows from the connecting hole into the flow hole, and then flows from the flow hole to the outer raceway and the inner raceway of the center ring, and then lubricates the outer layer balls and the inner layer balls, thereby ensuring the lubrication effect of the outer layer balls and the inner layer balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the outer ring, the center ring and the inner ring of the present invention; Figure 3 For the present invention Figure 1 A schematic diagram of the structure in a sectional view on the right side; Figure 4 It is a schematic diagram of the structure of the outer ball and the inner ball of the present invention; Figure 5 This is a schematic diagram of the outer ring layered structure of the present invention; Figure 6 This is a schematic diagram of the layered structure of the center circle of the present invention; Figure 7 This is a schematic diagram of the inner ring layered structure of the present invention; Figure 8 It is a schematic diagram of the structure of the center ring and the porous ceramic ring of the present invention; Fig. 9 It is a structural schematic diagram of the center circle of the present invention; Fig.10 It is a schematic structural diagram of the bearing cover of the present invention.

[0016] In the figure: 1. outer ring; 101. alloy matrix; 102. anti-corrosion layer one; 103. wear-resistant layer one; 2. center ring; 201. nano matrix; 202. wear-resistant layer two; 203. wear-resistant layer three; 3. inner ring; 301. ceramic matrix; 302. wear-resistant layer four; 303. anti-corrosion layer two; 4. outer layer ball; 5. inner layer ball; 6. outer layer retaining frame; 7. inner layer retaining frame; 8. outer support body; 9. lubrication groove; 10. bearing cover; 1001. clamping ring; 11. porous ceramic ring; 12. flow hole; 13. connecting hole. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Embodiment 1 See also Figure 1-Figure 7The present invention provides a technical solution: a dental pistol bearing, comprising an outer ring 1 and an inner ring 3, a center ring 2 is arranged between the outer ring 1 and the inner ring 3, a raceway is arranged between the center ring 2 and the inner ring 3, and an inner layer ball 5 is arranged to roll in the raceway, a raceway is arranged between the outer ring 1 and the center ring 2, and an outer layer ball 4 is arranged to roll in the raceway, a plurality of outer layer balls 4 are arranged, and an outer layer retainer 6 is arranged on the outer rolling sleeve of the outer layer ball 4, and an inner layer retainer 7 is arranged on the outer rolling sleeve of the inner layer ball 5, and both the outer layer retainer 6 and the inner layer retainer 7 are circular ring chains, an outer support body 8 is arranged on the outer side of the outer ring 1, and the outer support body 8 is arranged around the outer ring 1 , and the outer support body 8 is fixedly installed on the outer ring 1, and the center ring 2 is added between the outer ring 1 and the inner ring 3 in the conventional design to provide an additional raceway, and then the outer layer balls 4 are arranged on the outer layer. When the bearing is working, the inner ring 3 is driven by the workpiece to rotate at a high speed, so that the inner layer balls 5 are subjected to force and roll in the raceway, and part of the force will be transmitted to the center ring 2, so that the center ring 2 also starts to rotate, and a part of the friction and kinetic energy is transmitted to the outer layer balls 4 between the center ring 2 and the outer ring 1, thereby reducing the friction of the inner layer balls 5 and the force acting on the inner layer balls 5, and improving the working life of the inner layer balls 5, thereby improving the overall shaft In order to extend the service life of the bearing, an outer support body 8 is arranged outside the outer ring 1 to support the outer ring 1, constrain the outer ring 1, prevent the outer ring 1 from deforming under high temperature and high pressure environment, and form a partition between the outer ring 1 and the installation part to reduce the probability of the outer ring 1 being deformed by force. An outer layer retainer 6 and an inner layer retainer 7 are respectively arranged on the outer layer balls 4 and the inner layer balls 5, and the outer layer balls 4 and the inner layer balls 5 are separated by equal distances and evenly distributed on the circumference of the raceway to prevent the outer layer balls 4 and the inner layer balls 5 from colliding and rubbing with each other during operation, thereby ensuring the normal operation of the bearing, and the outer layer retainer 6 and the inner layer retainer 7 are arranged on the outer layer balls 4 and the inner layer balls 5. 7 wraps the outer balls 4 and the inner balls 5 to prevent them from direct contact with the rolling elements, thereby reducing friction and heat generation to a minimum, thereby extending the service life of the bearing, and guiding the outer balls 4 and the inner balls 5 to roll on the correct raceway to ensure the smooth operation of the bearing. The outer cage 6 and the inner cage 7 form a gap between the outer balls 4 and the inner balls 5 to provide space for the lubricant, which helps to improve the lubrication performance of the bearing. By evenly distributing the outer balls 4 and the inner balls 5, the outer cage 6 and the inner cage 7 can improve the load distribution inside the bearing, so that the bearing bears a more uniform load and improves the load-bearing capacity; The outer layer balls 4 and the inner layer balls 5 have the same specifications, and the number of the outer layer balls 4 is greater than the number of the inner layer balls 5 to maintain the same density of the corresponding balls in the inner and outer layers, ensuring that the load inside the bearing is evenly distributed during the operation of the bearing; The outer layer balls 4 and the inner layer balls 5 are made of silicon nitride ceramics, which have high enough hardness and good wear resistance, and are suitable for high temperature and high speed bearings. The main bodies of the outer layer cages 6 and the inner layer cages 7 are made of polyamide nylon materials, which have the advantages of high elasticity and light weight. The cages made of this material have very good sliding and self-lubricating properties. The front and rear parts of the outer layer cages 6 and the inner layer cages 7 are connected by aluminum alloy rivets, which are simple to process and have good corrosion resistance, and can reduce the processing cost of the bearing. The outer support body 8 is made of titanium alloy, which has good toughness, can play a certain buffering role between the outer ring 1 and the installation part, is light in weight but high in strength, can limit the problem of looseness between the outer ring 1 and the installation part caused by the breakage of the outer support body 8 itself, and has good heat resistance, and can be used in high temperature environments. The outer support body 8 is composed of bosses, and the gaps between adjacent bosses are in a semicircular arc shape. The gaps between adjacent bosses are used for installation, and multiple installation angles are possible, and no additional installation holes are required; The outer ring 1 includes an alloy substrate 101, an anti-corrosion layer 102, and a wear-resistant layer 103. The anti-corrosion layer 102 is arranged on the outer layer of the alloy substrate 101, and the wear-resistant layer 103 is arranged on the inner layer of the alloy substrate 101. The alloy substrate 101 is made of alloy materials such as high-carbon chromium bearing steel, aluminum alloy, copper alloy, etc., which can withstand greater loads and higher speeds, and has good lubrication properties, and can effectively reduce vibration and noise. The anti-corrosion layer 102 is made of titanium nitride and carbide coatings, which not only have good anti-corrosion properties but also have sufficiently high hardness, thereby ensuring the strength of the outer ring 1 itself. The wear-resistant layer 103 is made of nitride coatings, which have good wear resistance and high hardness, and are useful for improving the strength of the outer ring 1, thereby reducing the probability of the outer ring 1 being deformed by force. The center ring 2 includes a nano matrix 201, a second wear-resistant layer 202, and a third wear-resistant layer 203. The second wear-resistant layer 202 is arranged on the outer layer of the nano matrix 201, and the third wear-resistant layer 203 is arranged on the inner layer of the nano matrix 201. The nano matrix 201 adopts nano graphene material, which has extremely low density, extremely high hardness and wear resistance, and a unique structure, and can withstand greater pressure and load, and can ensure that the center ring 2 will not be deformed under the pressure between the outer ball 4 and the inner ball 5. The second wear-resistant layer 202 and the third wear-resistant layer 203 adopt nitride coating, and have good fatigue resistance. For the center ring 2 that has been involved in the work, the fatigue resistance of the center ring 2 itself is improved, and the service life of the bearing can also be improved; The inner ring 3 includes a ceramic substrate 301, a wear-resistant layer four 302, and an anti-corrosion layer two 303. The wear-resistant layer four 302 is arranged on the outer layer of the ceramic substrate 301, and the anti-corrosion layer two 303 is arranged on the inner layer of the ceramic substrate 301. The ceramic substrate 301 is made of silicon nitride material, which can withstand sufficiently high rotation speed and high temperature. It is a commonly used material for high-speed bearings. The wear-resistant layer four 302 is made of nitride coating and has good fatigue resistance. For the inner ring 3 that has been involved in the work, the fatigue resistance of the inner ring 3 itself is improved, and the service life of the bearing can also be improved. The wear-resistant layer four 302 is made of polyimide coating, which has excellent properties such as high temperature resistance, corrosion resistance, and low friction coefficient. It is a commonly used wear-resistant coating material in high-speed bearings.

[0019] Working principle: During use, when the bearing is subjected to external force, such as the rotational force generated by the dental pistol during operation, the outer ring 1 remains relatively still, while the inner ring 3 rotates at high speed with the rotating parts of the dental pistol. The rotation of the inner ring 3 is transmitted to the center ring 2 through the inner ball 5. Since the inner ball 5 rolls in the raceway, this transmission is smooth and efficient. The center ring 2 then transmits the rotational force to the outer ring 1 through the outer ball 4, but since the outer ring 1 is fixed by the outer support body 8, it remains still. The rolling of the outer ball 4 in the raceway and the supporting effect of the outer retaining frame 6 ensure the smooth transmission of the rotational force and reduce friction and wear. The inner retaining frame 7 also plays a role in supporting and stabilizing the inner ball 5, ensuring the correct position and stable rolling of the inner ball 5 in the raceway. This structure and working principle of the bearing enable it to withstand high-speed rotation and large axial and radial loads. The design of the ball and retaining frame reduces friction and wear, improves the durability and reliability of the bearing, and the fixing effect of the outer support body 8 ensures the stability and precision of the bearing during operation.

[0020] Embodiment 2 See also Figure 1-Figure 9The present invention provides a technical solution: a dental pistol bearing, comprising an outer ring 1 and an inner ring 3, a center ring 2 is arranged between the outer ring 1 and the inner ring 3, a raceway is arranged between the center ring 2 and the inner ring 3, and an inner layer ball 5 is arranged to roll in the raceway, a raceway is arranged between the outer ring 1 and the center ring 2, and an outer layer ball 4 is arranged to roll in the raceway, a plurality of outer layer balls 4 are arranged, and an outer layer retainer 6 is arranged on the outer rolling sleeve of the outer layer ball 4, and an inner layer retainer 7 is arranged on the outer rolling sleeve of the inner layer ball 5, and both the outer layer retainer 6 and the inner layer retainer 7 are circular ring chains, an outer support body 8 is arranged on the outer side of the outer ring 1, and the outer support body 8 is arranged around the outer ring 1 , and the outer support body 8 is fixedly installed on the outer ring 1, and the center ring 2 is added between the outer ring 1 and the inner ring 3 in the conventional design to provide an additional raceway, and then the outer layer balls 4 are arranged on the outer layer. When the bearing is working, the inner ring 3 is driven by the workpiece to rotate at a high speed, so that the inner layer balls 5 are subjected to force and roll in the raceway, and part of the force will be transmitted to the center ring 2, so that the center ring 2 also starts to rotate, and a part of the friction and kinetic energy is transmitted to the outer layer balls 4 between the center ring 2 and the outer ring 1, thereby reducing the friction of the inner layer balls 5 and the force acting on the inner layer balls 5, and improving the working life of the inner layer balls 5, thereby improving the overall shaft In order to extend the service life of the bearing, an outer support body 8 is arranged outside the outer ring 1 to support the outer ring 1, constrain the outer ring 1, prevent the outer ring 1 from deforming under high temperature and high pressure environment, and form a partition between the outer ring 1 and the installation part to reduce the probability of the outer ring 1 being deformed by force. An outer layer retainer 6 and an inner layer retainer 7 are respectively arranged on the outer layer balls 4 and the inner layer balls 5, and the outer layer balls 4 and the inner layer balls 5 are separated by equal distances and evenly distributed on the circumference of the raceway to prevent the outer layer balls 4 and the inner layer balls 5 from colliding and rubbing with each other during operation, thereby ensuring the normal operation of the bearing, and the outer layer retainer 6 and the inner layer retainer 7 are arranged on the outer layer balls 4 and the inner layer balls 5. 7 wraps the outer balls 4 and the inner balls 5 to prevent them from direct contact with the rolling elements, thereby reducing friction and heat generation to a minimum, thereby extending the service life of the bearing, and guiding the outer balls 4 and the inner balls 5 to roll on the correct raceway to ensure the smooth operation of the bearing. The outer cage 6 and the inner cage 7 form a gap between the outer balls 4 and the inner balls 5 to provide space for the lubricant, which helps to improve the lubrication performance of the bearing. By evenly distributing the outer balls 4 and the inner balls 5, the outer cage 6 and the inner cage 7 can improve the load distribution inside the bearing, so that the bearing bears a more uniform load and improves the load-bearing capacity; Lubrication grooves 9 are provided on the front and back sides of the center ring 2. A porous ceramic ring 11 is fixedly installed inside the lubrication groove 9. A connecting hole 13 is provided inside the lubrication groove 9. A circulation hole 12 is provided on the center ring 2. The circulation hole 12 connects the inner and outer sides of the center ring 2. The circulation hole 12 is connected to the connecting hole 13. The porous ceramic ring 11 is provided to store lubricating oil. The lubricating oil is slowly released by utilizing the holes on the porous ceramic ring 11. The lubricating oil flows from the connecting hole 13 into the circulation hole 12, and then flows from the circulation hole 12 to the outer raceway and the inner raceway of the center ring 2, thereby lubricating the outer layer balls 4 and the inner layer balls 5, thereby ensuring the lubrication effect of the outer layer balls 4 and the inner layer balls 5.

[0021] Working principle: When in use, when the bearing is subjected to external force, such as the rotational force generated by the dental pistol when working, the outer ring 1 remains relatively still, while the inner ring 3 rotates at high speed with the rotating parts of the dental pistol. The rotation of the inner ring 3 is transmitted to the center ring 2 through the inner ball 5. Since the inner ball 5 rolls in the raceway, this transmission is smooth and efficient. The center ring 2 then transmits the rotational force to the outer ring 1 through the outer ball 4, but since the outer ring 1 is fixed by the external support body 8, it remains still. The rolling of the outer ball 4 in the raceway and the support of the outer retainer 6 ensure the smooth transmission of the rotational force and reduce friction and wear. The inner retainer 7 also supports and stabilizes the inner ball 5, ensuring the correct position and stability of the inner ball 5 in the raceway. Fixed rolling, this structure and working principle of the bearing enables it to withstand high-speed rotation and large axial and radial loads. The design of the ball and retainer reduces friction and wear, improves the durability and reliability of the bearing, and the fixing effect of the outer support body 8 ensures the stability and precision of the bearing during operation. During the rotation of the center ring 2, the lubricating oil in the porous ceramic ring 11 flows slowly under the action of centrifugal force, but when the center ring 2 stops, the lubricating oil in the porous ceramic ring 11 can flow out slowly, and the lubricating oil flows from the connecting hole 13 into the flow hole 12, and then flows from the flow hole 12 to the outer raceway and inner raceway of the center ring 2. When the center ring 2 is working, the outer ball 4 and the inner ball 5 roll and contact with the lubricating oil, ensuring that the lubricating oil is attached to the outer ball 4 and the inner ball 5.

[0022] Embodiment 3 See also Figure 1-Figure 10The present invention provides a technical solution: a dental pistol bearing, comprising an outer ring 1 and an inner ring 3, a center ring 2 is arranged between the outer ring 1 and the inner ring 3, a raceway is arranged between the center ring 2 and the inner ring 3, and an inner layer ball 5 is arranged to roll in the raceway, a raceway is arranged between the outer ring 1 and the center ring 2, and an outer layer ball 4 is arranged to roll in the raceway, a plurality of outer layer balls 4 are arranged, and an outer layer retainer 6 is arranged on the outer rolling sleeve of the outer layer ball 4, and an inner layer retainer 7 is arranged on the outer rolling sleeve of the inner layer ball 5, and both the outer layer retainer 6 and the inner layer retainer 7 are circular ring chains, an outer support body 8 is arranged on the outer side of the outer ring 1, and the outer support body 8 is arranged around the outer ring 1 , and the outer support body 8 is fixedly installed on the outer ring 1, and the center ring 2 is added between the outer ring 1 and the inner ring 3 in the conventional design to provide an additional raceway, and then the outer layer balls 4 are arranged on the outer layer. When the bearing is working, the inner ring 3 is driven by the workpiece to rotate at a high speed, so that the inner layer balls 5 are subjected to force and roll in the raceway, and part of the force will be transmitted to the center ring 2, so that the center ring 2 also starts to rotate, and a part of the friction and kinetic energy is transmitted to the outer layer balls 4 between the center ring 2 and the outer ring 1, thereby reducing the friction of the inner layer balls 5 and the force acting on the inner layer balls 5, and improving the working life of the inner layer balls 5, thereby improving the overall shaft In order to extend the service life of the bearing, an outer support body 8 is arranged outside the outer ring 1 to support the outer ring 1, constrain the outer ring 1, prevent the outer ring 1 from deforming under high temperature and high pressure environment, and form a partition between the outer ring 1 and the installation part to reduce the probability of the outer ring 1 being deformed by force. An outer layer retainer 6 and an inner layer retainer 7 are respectively arranged on the outer layer balls 4 and the inner layer balls 5, and the outer layer balls 4 and the inner layer balls 5 are separated by equal distances and evenly distributed on the circumference of the raceway to prevent the outer layer balls 4 and the inner layer balls 5 from colliding and rubbing with each other during operation, thereby ensuring the normal operation of the bearing, and the outer layer retainer 6 and the inner layer retainer 7 are arranged on the outer layer balls 4 and the inner layer balls 5. 7 wraps the outer balls 4 and the inner balls 5 to prevent them from direct contact with the rolling elements, thereby reducing friction and heat generation to a minimum, thereby extending the service life of the bearing, and guiding the outer balls 4 and the inner balls 5 to roll on the correct raceway to ensure the smooth operation of the bearing. The outer cage 6 and the inner cage 7 form a gap between the outer balls 4 and the inner balls 5 to provide space for the lubricant, which helps to improve the lubrication performance of the bearing. By evenly distributing the outer balls 4 and the inner balls 5, the outer cage 6 and the inner cage 7 can improve the load distribution inside the bearing, so that the bearing bears a more uniform load and improves the load-bearing capacity; The front and back sides of the center ring 2 are provided with lubrication grooves 9, and a porous ceramic ring 11 is fixedly installed inside the lubrication groove 9. A connecting hole 13 is provided inside the lubrication groove 9. A flow hole 12 is provided on the center ring 2. The flow hole 12 connects the inner and outer sides of the center ring 2. The flow hole 12 is connected to the connecting hole 13. The porous ceramic ring 11 is provided to store lubricating oil. The lubricating oil is slowly released by using the holes on the porous ceramic ring 11. The lubricating oil flows from the connecting hole 13 into the flow hole 12, and then flows from the flow hole 12 to the outer raceway and the inner raceway of the center ring 2, thereby lubricating the outer layer balls 4 and the inner layer balls 5, thereby ensuring the lubrication effect of the outer layer balls 4 and the inner layer balls 5; The front and back sides of the outer ring 1, the center ring 2 and the inner ring 3 are provided with bearing caps 10. A clamping ring 1001 is fixedly provided on the outer wall of the bearing cap 10 facing the center ring 2. The clamping ring 1001 is buckled and arranged in the lubrication groove 9. The bearing cap 10 is made of die-cast aluminum alloy. The bearing cap 10 is connected with the center ring 2 by buckling, so that the bearing cap 10 does not rotate when the center ring 2 rotates. The bearing cap 10 is arranged to shield the raceway between the outer ring 1 and the center ring 2 and the raceway between the center ring 2 and the inner ring 3 to prevent debris from entering the raceway. The bearing cap 10 made of die-cast aluminum alloy has sufficient tensile strength and toughness, and is suitable for high-speed rotating bearings. The connection between the clamping ring 1001 and the bearing cover 10 is rounded, and the outer wall of the bearing cover 10 facing the outer ring 1 is provided with an integrally formed semicircular protrusion. The semicircular protrusion is provided to reduce the contact surface between the bearing cover 10 and the outer ring 1, thereby reducing the friction between the bearing cover 10 and the outer ring 1 when the bearing cover 10 is driven by the center ring 2 to rotate.

[0023] Working principle: When in use, when the bearing is subjected to external force, such as the rotational force generated by the dental pistol when working, the outer ring 1 remains relatively still, while the inner ring 3 rotates at high speed with the rotating parts of the dental pistol. The rotation of the inner ring 3 is transmitted to the center ring 2 through the inner ball 5. Since the inner ball 5 rolls in the raceway, this transmission is smooth and efficient. The center ring 2 then transmits the rotational force to the outer ring 1 through the outer ball 4, but since the outer ring 1 is fixed by the external support body 8, it remains still. The rolling of the outer ball 4 in the raceway and the support of the outer retainer 6 ensure the smooth transmission of the rotational force and reduce friction and wear. The inner retainer 7 also supports and stabilizes the inner ball 5, ensuring the correct position and stable rolling of the inner ball 5 in the raceway. This structure and working principle of the bearing make It can withstand high-speed rotation and large axial and radial loads. The design of the ball and retainer reduces friction and wear, and improves the durability and reliability of the bearing. The fixing effect of the outer support body 8 ensures the stability and precision of the bearing during operation. During the rotation of the center ring 2, the lubricating oil in the porous ceramic ring 11 flows slowly under the action of centrifugal force, but when the center ring 2 stops, the lubricating oil in the porous ceramic ring 11 can flow out slowly, and the lubricating oil flows from the connecting hole 13 into the flow hole 12, and then flows from the flow hole 12 to the outer raceway and the inner raceway of the center ring 2. When the center ring 2 is working, the outer layer balls 4 and the inner layer balls 5 roll and contact with the lubricating oil, ensuring that the lubricating oil is attached to the outer layer balls 4 and the inner layer balls 5. When the center ring 2 rotates, the bearing cover 10 can be driven to rotate, and can also be stationary relative to the outer ring 1.

[0024] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A dental pistol bearing, comprising an outer ring (1) and an inner ring (3), characterized in that: A center ring (2) is arranged between the outer ring (1) and the inner ring (3), a raceway is arranged between the center ring (2) and the inner ring (3), and an inner layer ball (5) is arranged to roll in the raceway, a raceway is arranged between the outer ring (1) and the center ring (2), and an outer layer ball (4) is arranged to roll in the raceway, a plurality of outer layer balls (4) are arranged, and an outer layer retaining frame (6) is arranged on the outer rolling sleeve of the outer layer ball (4), and an inner layer retaining frame (7) is arranged on the outer rolling sleeve of the inner layer ball (5), and the outer layer retaining frame (6) and the inner layer retaining frame (7) are both circular chain, and an outer support body (8) is arranged on the outer side of the outer ring (1), and the outer support body (8) is wound around the outer ring (1) and fixedly mounted on the outer ring (1).

2. A dental pistol bearing according to claim 1, characterized in that: The outer layer balls (4) and the inner layer balls (5) have the same specifications, and the number of the outer layer balls (4) is greater than the number of the inner layer balls (5).

3. A dental pistol bearing according to claim 1, characterized in that: The outer layer balls (4) and the inner layer balls (5) are both made of silicon nitride ceramic material, the outer layer retaining frame (6) and the inner layer retaining frame (7) have their main bodies made of polyamide nylon material, and the front and rear parts of the outer layer retaining frame (6) and the inner layer retaining frame (7) are connected by aluminum alloy rivets.

4. A dental pistol bearing according to claim 1, characterized in that: The outer support body (8) is made of titanium alloy, and is composed of bosses, wherein the gaps between adjacent bosses are in a semicircular arc shape.

5. A dental pistol bearing according to claim 1, characterized in that: The outer ring (1) comprises an alloy substrate (101), an anti-corrosion layer 1 (102), and a wear-resistant layer 1 (103); the anti-corrosion layer 1 (102) is arranged on the outer layer of the alloy substrate (101), and the wear-resistant layer 1 (103) is arranged on the inner layer of the alloy substrate (101).

6. A dental pistol bearing according to claim 1, characterized in that: The central ring (2) comprises a nano matrix (201), a second wear-resistant layer (202), and a third wear-resistant layer (203); the second wear-resistant layer (202) is arranged on the outer layer of the nano matrix (201), and the third wear-resistant layer (203) is arranged on the inner layer of the nano matrix (201).

7. A dental pistol bearing according to claim 1, characterized in that: The inner ring (3) comprises a ceramic matrix (301), a wear-resistant layer four (302), and an anti-corrosion layer two (303), wherein the wear-resistant layer four (302) is arranged on the outer layer of the ceramic matrix (301), and the anti-corrosion layer two (303) is arranged on the inner layer of the ceramic matrix (301).

8. The dental pistol bearing according to claim 1, characterized in that: The front and back sides of the center ring (2) are both provided with lubrication grooves (9), a porous ceramic ring (11) is fixedly mounted inside the lubrication groove (9), a connecting hole (13) is provided inside the lubrication groove (9), a circulation hole (12) is provided on the center ring (2), the circulation hole (12) connects the inner and outer sides of the center ring (2), and the circulation hole (12) is connected to the connecting hole (13).

9. The dental pistol bearing according to claim 1, characterized in that: The front and back sides of the outer ring (1), the center ring (2) and the inner ring (3) are provided with bearing covers (10); a clamping ring (1001) is fixedly provided on the outer wall of the bearing cover (10) on one side facing the center ring (2); the clamping ring (1001) is buckled and arranged in the lubrication groove (9); and the bearing cover (10) is made of die-cast aluminum alloy.

10. A dental pistol bearing according to claim 9, characterized in that: The connection between the clamping ring (1001) and the bearing cover (10) is rounded, and an outer wall of the bearing cover (10) on one side facing the outer ring (1) is provided with an integrally formed semicircular convex point.

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