Double-row integrated miniature bearing for accelerating dental handpiece and dental handpiece

Abstract

The utility model relates to the technical field of dental medical instruments, in particular to a double-row integrated miniature bearing for accelerating a dental handpiece and the dental handpiece. The bearing comprises a cylindrical bearing outer ring, and the inner sides of the two ends of the bearing outer ring are respectively provided with a coaxial bearing inner ring; a coaxial cylindrical retainer is arranged between each bearing inner ring and each bearing outer ring, gaps are formed between the inner side and the outer side of each retainer and the corresponding bearing inner ring and between the inner side and the outer side of each retainer and the corresponding bearing outer ring, a plurality of through holes penetrating through the inner side wall and the outer side wall of each retainer are formed in each retainer in the circumferential direction at intervals, and a rolling piece capable of freely rotating is arranged in each through hole. The inner sides and the outer sides of the rolling pieces are attached to the bearing inner ring and the bearing outer ring respectively, and the bearing inner ring and the bearing outer ring are rotatably connected through the rolling pieces. According to the double-row integrated miniature bearing provided by the utility model, the problems of bearing misalignment, unbalanced stress, relatively large vibration, relatively large noise, short service life and the like which are easily caused by a split type bearing can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of dental medical device technology, specifically a dual-row integrated miniature bearing and dental handpiece for accelerating dental handpieces. Background Technology

[0002] A dental handpiece is a commonly used oral medical instrument used for drilling, cutting, grinding, and polishing teeth. Dental handpieces are generally divided into high-speed and low-speed types. High-speed handpieces are typically driven by compressed air that rotates a turbine at high speed, resulting in high output speed but low torque, making them unsuitable for applications requiring higher torque. Low-speed handpieces are usually driven by a motor, generating higher torque. In some applications, both high torque and high output speed are required. This is typically achieved by incorporating a speed-increasing gear assembly in the handpiece's transmission mechanism. Some speed-increasing gear assemblies can achieve a speed increase of 5:1. The output gears and drive shaft of this speed-increasing gear assembly rotate at very high speeds, placing higher demands on the bearings. However, current technology generally uses separate bearings at each end of the drive shaft. During high-speed rotation, these separate bearings are prone to problems such as misalignment, unbalanced forces, excessive vibration, high noise, and short lifespan. Furthermore, they are difficult to assemble, requiring extremely high precision, which can lead to a high product defect rate. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the present invention aims to provide a dual-row integrated miniature bearing and dental handpiece for speed-up dental handpieces.

[0004] One of the objectives of this utility model is achieved through the following technical solution:

[0005] A dual-row integrated miniature bearing for speed-up dental handpieces includes a cylindrical bearing outer ring, with a coaxial bearing inner ring on each of the inner and outer ends of the outer ring. A coaxial cylindrical cage is provided between each bearing inner ring and the bearing outer ring. The inner and outer sides of the cage have gaps with the bearing inner ring and the bearing outer ring, respectively. The cage has several through holes spaced circumferentially through its inner and outer walls. Each through hole contains a freely rotatable rolling element. The inner and outer sides of the rolling element are in contact with the bearing inner ring and the bearing outer ring, respectively. The bearing inner ring and the bearing outer ring are rotatably connected through the rolling elements.

[0006] As a preferred technical solution, the inner and outer rings of the bearing are respectively provided with annular grooves on their respective circumferential surfaces for each of the rolling elements to be embedded in, thereby limiting the movement of the rolling elements.

[0007] The second objective of this utility model is achieved through the following technical solution:

[0008] A dental handpiece includes a head and a body. The head is connected to the front end of the body. A transmission mechanism is provided inside the body. The rear end of the transmission mechanism is provided with a connector for driving a motor. The transmission mechanism includes at least one speed-increasing gear assembly, which includes an input gear and an output gear. The gear ratio of the input gear to the output gear is greater than 1 to achieve a speed-increasing effect. The drive shaft of at least the output gear is rotatably connected to the body through the aforementioned double-row integrated miniature bearing.

[0009] This utility model discloses a double-row integrated miniature bearing and dental handpiece for speed-up dental handpieces, which has the following advantages: by providing a coaxial bearing inner ring on the inner side of each end of the outer ring of the bearing, and providing a coaxial cylindrical cage between each bearing inner ring and the outer ring of the bearing, with rolling elements spaced in each through hole of the cage, it can effectively avoid the problems of bearing misalignment, unbalanced force, large vibration, large noise, and short service life that are prone to occur in split bearings. Moreover, it is easy to assemble and has a low failure rate.

[0010] The following will further explain the concept, specific structure and effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the external structure of the dual-row integrated miniature bearing used for speed-up dental handpieces in Example 1;

[0012] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0013] Figure 3 yes Figure 1 A schematic diagram of the decomposed structure;

[0014] Figure 4 This is a schematic diagram of the external structure of the dental handpiece in Example 2;

[0015] Figure 5 yes Figure 4 A schematic diagram of the longitudinal cross-sectional structure.

[0016] The components include: a double-row integrated miniature bearing 1, an outer bearing ring 11, an inner bearing ring 12, a cage 13, rolling elements 14, an annular groove 15, a head 2, a body 3, a transmission mechanism 4, a coupling 41, an input gear 42, an output gear 43, and a transmission shaft 44. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0018] It should be noted that in this application, the terms "upper," "lower," "left," "right," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are primarily used to better describe this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, the terms "installed," "set," "equipped with," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0019] Example 1:

[0020] like Figure 1-3 As shown, this embodiment provides a dual-row integrated miniature bearing 1 for speed-up dental handpieces, including a cylindrical bearing outer ring 11. Two coaxial bearing inner rings 12 are respectively provided on the inner sides of both ends of the outer ring 11, with an axial distance between the two inner rings 12. A coaxial cylindrical retainer 13 is provided between each inner ring 12 and the outer ring 11. The inner and outer sides of the retainer 13 have gaps with the inner ring 12 and the outer ring 11, respectively. The retainer 13 has several through holes spaced circumferentially through its inner and outer walls. Each through hole contains a freely rotatable rolling element 14. The inner and outer sides of the rolling element 14 are in contact with the inner ring 12 and the outer ring 11, respectively. The inner ring 12 and the outer ring 11 are rotatably connected by the rolling elements 14. In this embodiment, the rolling element 14 is a ball; in other embodiments, the rolling element can also be a roller or other rolling structure.

[0021] The dual-row integrated miniature bearing 1 for speed-up dental handpieces provided in this embodiment has a coaxial bearing inner ring 12 on the inner side of each end of the bearing outer ring 11, and a coaxial cylindrical cage 13 between each bearing inner ring 12 and the bearing outer ring 11. Rolling elements 14 are spaced apart in each through hole of the cage 13, thereby effectively avoiding the problems of bearing misalignment, unbalanced force, large vibration, large noise, and short service life that are easy to occur in split bearings.

[0022] As one preferred embodiment, the inner ring 12 and the outer ring 11 of the bearing are respectively provided with annular grooves 15 for each of the rolling elements 14 to be partially embedded, thereby limiting the rolling elements 14.

[0023] Example 2:

[0024] like Figure 4-5 As shown, a dental handpiece includes a head 2 and a body 3. The head 2 is connected to the front end of the body 3. A transmission mechanism 4 is provided inside the body 3. The rear end of the transmission mechanism 4 is provided with a coupling 41 for driving a motor (not shown in the figure). The transmission mechanism 4 includes a speed-increasing gear assembly, which includes an input gear 42 and an output gear 43. The gear ratio of the input gear 42 to the output gear 43 is 5:1, so that the rotational speed of the output gear 43 and its transmission shaft will increase to 5 times the rotational speed of the input gear 42. The transmission shaft 44 of the output gear 43 is rotatably connected to the body 3 through a double-row integrated miniature bearing 1 as shown in Embodiment 1. The transmission shaft 44 of the output gear 43 is fixedly inserted in the inner ring 12 of the bearing, and the outer ring 11 of the bearing is fixedly connected to the body 3. In this embodiment, the dental handpiece uses the double-row integrated miniature bearing 1 from Embodiment 1 on the drive shaft 44 of the output gear 43, which makes it easier to meet the high speed requirements of the output gear 43 and its drive shaft 44, and avoids problems such as bearing misalignment, unbalanced force, large vibration, large noise, and short service life.

[0025] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A dual-row integrated miniature bearing for speed-up dental handpieces, characterized in that, The bearing includes a cylindrical outer ring, with a coaxial inner ring on each of its two inner ends. A coaxial cylindrical cage is provided between each inner ring and the outer ring. The inner and outer sides of the cage have gaps with the inner and outer rings, respectively. The cage has several through holes spaced circumferentially through its inner and outer walls. Each through hole contains a freely rotatable rolling element. The inner and outer sides of the rolling element are in contact with the inner and outer rings, respectively. The inner and outer rings are rotatably connected through the rolling elements.

2. The dual-row integrated miniature bearing for speed-increasing dental handpieces according to claim 1, characterized in that, The inner and outer rings of the bearing are respectively provided with annular grooves on their opposite circumferential surfaces for each of the rolling elements to be embedded in, thereby limiting the movement of the rolling elements.

3. A dental handpiece, characterized in that, The device includes a head and a body. The head is connected to the front end of the body. A transmission mechanism is provided inside the body. The rear end of the transmission mechanism is provided with a coupling for connecting a motor. The transmission mechanism includes at least one speed-increasing gear assembly, which includes an input gear and an output gear. The gear ratio between the input gear and the output gear is greater than 1 to achieve a speed-increasing effect. The transmission shaft of at least the output gear is rotatably connected to the body through a double-row integrated miniature bearing as described in any one of claims 1-2.

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