High-speed dental drill bearing

Abstract

A high-speed dental drill bearing comprises an outer ring, an inner ring and a plurality of rolling bodies located between the outer ring and the inner ring, the rolling bodies are placed in a retainer, the retainer comprises pockets corresponding to the rolling bodies in number, and the hole diameter of an opening, corresponding to one side of the inner ring, of each pocket is larger than that of an opening, corresponding to one side of the outer ring, of each pocket. The hole diameter of each pocket hole is gradually reduced from an opening corresponding to one side of the inner ring to an opening corresponding to one side of the outer ring; the retainer is integrally formed in an injection molding mode, and the retainer makes contact with the outer diameter face of the inner ring and rotates along with the inner ring. The retainer has the advantages that the retainer is integrally formed through injection molding, the tedious process of traditional turning machining is changed, production cost and machining difficulty are reduced, production efficiency is improved, and the problems of low efficiency and high cost caused by complex turning machining are effectively solved.

Description

Technical Field

[0001] The utility model relates to a bearing, in particular to a high-speed dental drill bearing. Background Art

[0002] High-speed dental drill bearings are key components in dental drill equipment. They primarily support the high-speed rotation of the drill, ensuring stable and precise operation during dental treatment. These bearings typically require high precision, high speed, low noise, and excellent wear resistance. Their compact design allows them to fit into the confined space of the drill. To reduce friction, high-quality lubrication methods and high-performance lubricants are typically used. During high-speed rotation, these bearings effectively reduce vibration, provide a comfortable operating experience for the doctor, and improve the efficiency and service life of the drill, playing a vital role in the field of dental care.

[0003] Existing high-speed dental drill bearing retainers are often manufactured through turning. This process requires high-precision machine tools and specialized cutting tools, and involves multiple steps of cutting, measuring, and adjustment, resulting in cumbersome operations. Turning is difficult and requires high worker skills. This results in low production efficiency, long processing cycles, and increased costs, making it difficult to meet the growing market demand for high-speed dental drill bearings. Improved processing technology is urgently needed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a high-speed dental drill bearing with a retainer manufactured by injection molding.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a high-speed dental drill bearing, comprising an outer ring, an inner ring and a plurality of rolling elements located between the outer ring and the inner ring, and the plurality of rolling elements are placed in a retaining frame, the retaining frame comprising pockets arranged corresponding to the number of rolling elements, the aperture of the opening of the pocket corresponding to the side of the inner ring being larger than the aperture of the opening corresponding to the side of the outer ring, and the aperture of the pocket is gradually reduced from the opening corresponding to the side of the inner ring toward the opening corresponding to the side of the outer ring; the retaining frame is integrally formed by injection molding, and the retaining frame is in contact with the outer diameter surface of the inner ring and rotates with the inner ring.

[0006] The beneficial effects of the present invention are as follows: the retaining frame is formed by one-piece injection molding, which changes the cumbersome process of traditional turning processing, reduces production costs and processing difficulty, improves production efficiency, and effectively solves the problems of low efficiency and high cost caused by complex turning processing. The unique aperture design of the pocket hole makes the rolling element more stable during operation, reduces the collision and friction between the rolling element and the retaining frame, reduces operating noise, extends the service life of the bearing, and improves the reliability and stability of the bearing, providing a strong guarantee for the efficient and precise operation of high-speed dental drills, enhancing the competitiveness of the product in the market, and meeting the high-speed dental drill's demand for high-performance and low-cost bearings. In addition, the retaining frame adopts an internal guide method in combination with the pocket hole aperture setting to better prevent the retaining frame from shifting during operation.

[0007] Furthermore, the outer surface of the retaining frame facing the inner ring is provided with contact surfaces between adjacent pockets, and a clearance arc groove is provided at the center of each contact surface, and the clearance arc groove reduces the contact area between the contact surface and the outer diameter surface of the inner ring.

[0008] The unique contact surface and relief arc groove design on the cage further optimizes the performance of high-speed dental drill bearings. The relief arc groove reduces the contact area between the contact surface and the outer diameter of the inner ring, reducing friction between the two, reducing energy loss, and improving bearing operating efficiency. Simultaneously, the reduced contact area also reduces heat generation, which helps maintain good thermal stability at high-speed operation and extends the bearing's service life. Furthermore, this design reduces cage weight and inertia, making the bearing more flexible during startup and operation, and enhancing the adaptability and reliability of high-speed dental drill bearings in high-speed dental drill equipment.

[0009] Furthermore, it also includes a dust cover, and the outer ring is provided with a mounting groove for inserting the dust cover, and the mounting groove includes a limiting surface distributed along the radial direction, and the limiting surface has at least partial radial contact area with the dust cover and prevents the dust cover from moving axially toward the rolling element through the limiting surface.

[0010] The design of the dust cover and outer ring mounting groove offers several significant benefits for high-speed dental drill bearings. The radial contact between the mounting groove's stop surface and the dust cover effectively prevents axial movement of the dust cover toward the rolling elements, ensuring a secure position. This effectively blocks dust and impurities from entering the bearing, reducing wear on components such as the rolling elements and cage due to foreign matter intrusion, thereby extending bearing service life. Furthermore, the stable dust cover mounting structure ensures a clean environment within the bearing, maintaining bearing operating accuracy, enhancing the reliability and stability of high-speed dental drills, reducing the probability of failure due to dust and impurities, and improving overall equipment performance.

[0011] Furthermore, it also includes a retaining spring, and the outer ring is provided with a retaining spring groove for inserting the retaining spring, and the retaining spring groove includes an abutting surface parallel to the limiting surface, and the side corresponding to the abutting surface is an adjustment surface arranged at an angle, and the retaining spring is placed in the retaining spring groove, and its two ends respectively abut against the adjustment surface and the abutting surface, and the end surface facing the abutting surface is abutted on the dust cover except for the part abutting against the abutting surface.

[0012] The design of the retaining ring and outer ring retaining ring groove further enhances the structure of the high-speed dental drill bearing. The retaining ring's ends rest against the abutment and adjustment surfaces, respectively, and a portion of its end face rests against the dust cover. This design enhances the dust cover's retention and provides a more secure barrier against the intrusion of dust and other impurities. Furthermore, the angled adjustment surface facilitates installation and fine-tuning of the retaining ring, reducing installation difficulty and improving assembly efficiency. Furthermore, the retaining ring and dust cover work together to withstand a certain amount of axial force, optimizing the bearing's axial load capacity and enhancing the stability and reliability of the high-speed dental drill bearing under complex operating conditions.

[0013] Furthermore, the outer ring and the inner ring are made of 95Cr18 stainless steel, the rolling elements are made of silicon nitride, and the retaining frame is made of PEEK+reinforced material.

[0014] The materials used in this high-speed dental drill bearing each have their own advantages. The outer and inner rings are made of 95Cr18 stainless steel, which offers excellent corrosion resistance, high strength, and hardness. It can maintain a stable structure in the complex environment of the oral cavity, ensuring the durability and reliability of the bearing. The rolling elements are made of silicon nitride, which has high hardness, high wear resistance, and good high-temperature resistance. It can withstand the friction and impact during high-speed operation, extend the service life of the rolling elements, and maintain the precision and stability of the bearing. The cage is made of PEEK + reinforced material. This material combination has excellent mechanical properties, wear resistance, and chemical stability. It is lightweight and can meet the requirements of high-speed rotation, reducing the moment of inertia and also reducing the friction coefficient to a certain extent, which helps to improve the overall performance and operating efficiency of the bearing. This allows the high-speed dental drill bearing to perform excellently under high-speed and high-precision working conditions and meet the stringent requirements of professional medical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an axonometric diagram of an embodiment of the present utility model;

[0016] Figure 2 A cross-sectional view of an embodiment of the present utility model;

[0017] Figure 3 This is a partial enlarged view of the mounting groove and the retaining spring groove of the embodiment of the utility model;

[0018] Figure 4 This is an axonometric view of the retaining frame according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The utility model embodiment of a high-speed dental drill bearing Figure 1 Figure 4 shows an outer ring 1, an inner ring 2, and a retainer 3 positioned between them. Retainer 3 is provided with several pockets 31 for receiving rolling elements 4. The opening of each pocket 31 corresponding to the inner ring 2 is larger than the opening corresponding to the outer ring 1, and the diameter of each pocket 31 tapers from the opening corresponding to the inner ring 2 toward the opening corresponding to the outer ring 1. First and second curved tracks 11, 21 are provided at corresponding positions on the outer ring 1 and inner ring 2, respectively. These pockets 31 allow the rolling elements 4 to fit more closely into the second curved tracks 21 during operation. Furthermore, retainer 3 contacts the outer diameter surface of the inner ring 2 and rotates with it. This interaction prevents significant displacement of retainer 3 during operation, achieving a quieter operation.

[0020] Several pockets 31 form contact surfaces 32 between adjacent pockets 31, facing toward and in contact with the inner ring 2. Each contact surface 32 is provided with a relief arc groove 321 at its center. This relief arc groove 321 reduces the contact area between the contact surface 32 and the outer diameter surface of the inner ring 2. This embodiment also includes a dust cover 5 and a retaining spring 6. The outer ring 1 is provided with a mounting groove 12 and a retaining spring groove 13 for inserting these two, respectively. The mounting groove 12 includes radially distributed limiting surfaces 121. These limiting surfaces 121 have at least partial radial contact with the dust cover 5 and prevent axial movement of the dust cover 5 toward the rolling element 4 through the limiting surfaces 121. The retaining ring groove 13 includes a rest surface 131 parallel to the limiting surface 121, and the side corresponding to the rest surface 131 is an adjustment surface 132 arranged at an angle. The retaining ring 6 is placed in the retaining ring groove 13, and its two ends respectively rest against the adjustment surface 132 and the rest surface 131, and the end surface facing the rest surface 131, except for the part resting against the rest surface 131, rests on the dust cover.

[0021] In this embodiment, the outer ring 1 and inner ring 2 are made of 95Cr18 stainless steel, the rolling elements 4 are made of silicon nitride, and the retainer 3 is made of PEEK + reinforcement material. The operation of this embodiment is as follows: After proper installation, the rolling elements 4 rotate within the channel formed by the first and second curved paths 11 and 21, with a bias toward the second curved path 21. Furthermore, the retainer 3 rotates with the inner ring 2, driving the retainer 3 to move at a specific speed and trajectory. This reduces the wobble and deflection of the retainer 3, thereby improving the bearing's rotational accuracy.

[0022] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A high-speed dental drill bearing comprising an outer ring, an inner ring, and a plurality of rolling elements positioned therebetween, wherein the plurality of rolling elements are positioned within a retaining frame, the retaining frame including pockets corresponding to the number of rolling elements, characterized in that: The aperture of the opening of the pocket corresponding to the inner ring side is larger than the aperture of the opening corresponding to the outer ring side, and the aperture of the pocket is gradually reduced from the opening corresponding to the inner ring side toward the opening corresponding to the outer ring side; the retaining frame is integrally formed by injection molding, and the retaining frame is in contact with the outer diameter surface of the inner ring and rotates with the inner ring.

2. The high-speed dental drill bearing according to claim 1, characterized in that: The outer surface of the retaining frame facing the inner ring is provided with contact surfaces between adjacent pockets, and a clearance arc groove is provided at the center of each contact surface. The clearance arc groove reduces the contact area between the contact surface and the outer diameter surface of the inner ring.

3. The high-speed dental drill bearing according to claim 1, characterized in that: It also includes a dust cover, and the outer ring is provided with a mounting groove for inserting the dust cover, and the mounting groove includes a limiting surface distributed along the radial direction, and the limiting surface has at least a partial radial contact area with the dust cover and prevents the dust cover from axially moving toward the rolling element through the limiting surface.

4. The high-speed dental drill bearing according to claim 3, characterized in that: It also includes a retaining spring, and the outer ring is provided with a retaining spring groove for inserting the retaining spring, and the retaining spring groove includes a supporting surface parallel to the limiting surface, and the side corresponding to the supporting surface is an adjustment surface arranged at an angle, and the retaining spring is placed in the retaining spring groove, and its two ends respectively abut against the adjustment surface and the supporting surface, and the end surface facing the supporting surface is abutted on the dust cover except for the part abutting against the supporting surface.

5. The high-speed dental drill bearing according to claim 1, characterized in that: The outer ring and the inner ring are made of 95Cr18 stainless steel, the rolling elements are made of silicon nitride, and the retaining frame is made of PEEK+ reinforced material.

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