Pneumatic dental handpiece

Abstract

This utility model discloses a pneumatic dental handpiece, relating to the field of medical device technology, comprising a connector, a lower housing, an upper housing, a guide sleeve, a connecting nut, and a pneumatic motor assembly. The connector has an internal air passage structure for connecting an external gas supply and exhaust device. The lower end of the lower housing is fitted onto the connector, and the upper end has a first flange extending radially inward. The lower end of the upper housing is aligned with the upper end of the lower housing. The guide sleeve is housed within the cavities of the lower and upper housings, with its lower end threadedly connected to the connector, a threaded connection portion in the middle, and its upper end engaging with the upper housing. The connecting nut is screwed onto the threaded connection portion and abuts against the first flange to press the lower housing onto the connector. The pneumatic motor assembly is disposed within the cavity of the lower housing, with its input end connected to the air passage structure and its output end rotatably engaged within the cavity of the guide sleeve and externally connected to dental surgical tools. This design simplifies the structure of the pneumatic dental handpiece and improves ease of assembly and disassembly.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a pneumatic dental handpiece. Background Technology

[0002] Pneumatic dental handpieces are indispensable tools in modern dental surgery, widely used in procedures such as tooth cutting, grinding, drilling, and restoration. The core function of a pneumatic dental handpiece is to achieve high-speed rotation via a gas-driven motor, providing precise and stable power support for dental procedures.

[0003] Existing pneumatic dental handpieces typically consist of multiple components assembled through complex mechanical connections. In practical use, disassembly and assembly often require specialized tools and involve cumbersome and time-consuming procedures. This complex structure not only increases manufacturing costs but also limits the efficiency of equipment maintenance to some extent. Therefore, how to simplify the structural design and improve the ease of disassembly and assembly while ensuring the basic performance of pneumatic dental handpieces has become an urgent technical problem to be solved. Utility Model Content

[0004] The main purpose of this invention is to propose a pneumatic dental handpiece, which aims to simplify the structure of existing pneumatic dental handpieces and improve the ease of assembly and disassembly.

[0005] To achieve the above objectives, the pneumatic dental handpiece proposed in this utility model includes:

[0006] The connector has an internal air passage structure, which is used to connect to external gas supply and exhaust equipment.

[0007] The lower housing is cylindrical in shape, with its lower end fitted onto the connector, and its upper end having a first flange extending radially inward.

[0008] The upper shell is cylindrical, and the lower end of the upper shell is connected to the upper end of the lower shell.

[0009] A guide sleeve is housed in the inner cavity of the lower housing and the inner cavity of the upper housing. The lower end of the guide sleeve is threaded to the connector, and the middle part of the guide sleeve is provided with a threaded connection part. The upper end of the guide sleeve is engaged with the upper housing.

[0010] A connecting nut is screwed onto the threaded connection portion; the connecting nut abuts against the first flange to press the lower housing onto the connector;

[0011] A pneumatic motor assembly is disposed in the inner cavity of the lower housing. The input end of the pneumatic motor assembly is connected to the air passage structure, and the output end of the pneumatic motor assembly is rotatably fitted into the inner cavity of the guide sleeve and used for external connection of dental surgical instruments.

[0012] In one embodiment, the guide sleeve has a second flange extending radially outward at its center. The second flange is located below the threaded connection portion. The upper end face of the second flange abuts against the lower end face of the first flange, and the connecting nut abuts against the upper end face of the first flange.

[0013] The pneumatic dental handpiece also includes a connecting bolt, which is locked to the connector from top to bottom by the upper end face of the second flange.

[0014] In one embodiment, the pneumatic dental handpiece further includes an elastic opening retainer ring, the inner periphery of which is engaged with the upper end of the guide sleeve, and the outer periphery of which expands outward based on elastic force and abuts against the inner sidewall of the upper housing.

[0015] In one embodiment, a limiting groove is provided around the outer periphery of the guide sleeve in the circumferential direction, and the inner periphery of the elastic open retaining ring is engaged in the limiting groove.

[0016] In one embodiment, the inner wall of the upper housing is provided with a third flange extending radially inward, and the outer periphery of the elastic open retaining ring has an inclined portion. The cross-sectional area of ​​the inclined portion gradually increases from bottom to top, and the inclined portion abuts against the upper turning point of the third flange under elastic force.

[0017] In one embodiment, the pneumatic motor assembly includes a stator base, a pneumatic rotor, and a transmission mechanism. The stator base is clamped between the guide sleeve and the connector. The air cavity of the stator base is connected to the air passage structure. The pneumatic rotor is rotatably disposed in the air cavity. The rotor shaft of the pneumatic rotor is connected to the input end of the transmission mechanism. The output end of the transmission mechanism is used to connect dental surgical tools externally.

[0018] In one embodiment, the pneumatic dental handpiece further includes a first connecting seat, which is clamped between the guide sleeve and the stator base; the lower end of the rotor shaft is rotatably connected to the connector via a first bearing, the middle part of the rotor shaft is rotatably connected to the first connecting seat via a second bearing, and the upper end of the rotor shaft is connected to the input end of the transmission mechanism.

[0019] The pneumatic dental handpiece also includes a connecting bolt, which passes through the guide sleeve, the first connecting seat, and the stator seat from top to bottom and is locked onto the connector.

[0020] In one embodiment, the transmission mechanism includes a sun gear, planet gears, a ring gear, and an output shaft. The sun gear is disposed on the rotor shaft. At least three planet gears are disposed circumferentially at intervals on the lower end of the output shaft and surrounding the sun gear. The sun gear meshes with the at least three planet gears for transmission. The upper end of the output shaft is used to connect dental surgical tools. The ring gear is disposed in the inner cavity of the guide sleeve and meshes with the at least three planet gears for transmission.

[0021] In one embodiment, the pneumatic dental handpiece further includes a first connecting seat and a second connecting seat; the first connecting seat is clamped between the guide sleeve and the stator seat, and the middle part of the rotor shaft is rotatably connected to the first connecting seat through a second bearing; the second connecting seat is disposed in the inner cavity of the guide sleeve, and the outer periphery of the second connecting seat is provided with a fourth flange extending radially outward, the gear ring is clamped between the fourth flange and the first connecting seat, and the middle part of the output shaft is rotatably connected to the second connecting seat through a third bearing.

[0022] In one embodiment, the output shaft includes a first shaft and a second shaft; at least three planetary gears are circumferentially spaced at the lower end of the first shaft, the middle part of the first shaft is rotatably connected to the second connecting seat via the third bearing, the upper end of the first shaft is connected to the lower end of the second shaft, the middle part of the second shaft is rotatably connected to the upper end of the guide sleeve via the fourth bearing, the upper end of the second shaft extends outward from the upper end of the guide sleeve and is opposite to the insertion interface of the upper housing, and the second shaft is used to connect dental surgical tools externally.

[0023] The pneumatic dental handpiece proposed in this utility model is based on the connection and fit between the connector, lower housing, guide sleeve, connecting nut and lower housing, making the structure simpler and more compact. It can quickly and conveniently complete the disassembly and assembly of the pneumatic dental handpiece without the need for professional tools. While ensuring the basic power output function of the pneumatic motor assembly and ensuring that the dental surgical tools can work normally, it reduces the manufacturing cost of the pneumatic dental handpiece and improves the maintenance efficiency of the pneumatic dental handpiece through convenient disassembly and assembly. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the pneumatic dental handpiece provided by this utility model;

[0026] Figure 2 A cross-sectional structural schematic diagram of an embodiment of the pneumatic dental handpiece provided by this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 for Figure 2 Enlarged diagram of point B in the middle.

[0029] Explanation of icon numbers:

[0030] 1. Connector; 101. Air circuit structure;

[0031] 2. Lower housing; 201. First flange;

[0032] 3. Upper housing; 301. Third flange; 302. Insertion interface;

[0033] 4. Guide sleeve; 401. Threaded connection; 402. Second flange; 403. Limiting groove;

[0034] 5. Connecting nuts;

[0035] 6. Pneumatic motor assembly; 601. Stator housing; 602. Pneumatic rotor; 603. Transmission mechanism; 6021. Rotor shaft; 6022. Rotor blades; 6031. Sun gear; 6032. Planet gears; 6033. Gear ring; 6034. Output shaft; 60341. First shaft; 60342. Second shaft;

[0036] 7. Connecting bolts;

[0037] 8. Flexible open retaining ring; 801. Inclined part;

[0038] 9. First connecting seat; 10. First bearing; 11. Second bearing;

[0039] 12. Second connecting seat; 1201. Fourth flange;

[0040] 13. Third bearing; 14. Fourth bearing.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] Pneumatic dental handpieces are indispensable tools in modern dental surgery, widely used in procedures such as tooth cutting, grinding, drilling, and restoration. The core function of a pneumatic dental handpiece is to achieve high-speed rotation via a gas-driven motor, providing precise and stable power support for dental procedures.

[0046] Existing pneumatic dental handpieces typically consist of multiple components assembled through complex mechanical connections. In practical use, disassembly and assembly often require specialized tools and involve cumbersome and time-consuming procedures. This complex structure not only increases manufacturing costs but also limits the efficiency of equipment maintenance to some extent. Therefore, how to simplify the structural design and improve the ease of disassembly and assembly while ensuring the basic performance of pneumatic dental handpieces has become an urgent technical problem to be solved.

[0047] To address the aforementioned problems, this invention provides a pneumatic dental handpiece, which aims to simplify the structure of existing pneumatic dental handpieces and improve the ease of assembly and disassembly.

[0048] Please see Figure 1 and Figure 2 The pneumatic dental handpiece provided by this utility model includes:

[0049] Connector 1 has an internal gas passage structure 101, which is used to connect to external gas supply and exhaust equipment.

[0050] The lower housing 2 is cylindrical in shape. The lower end of the lower housing 2 is sleeved on the connector 1, and the upper end of the lower housing 2 is provided with a first flange 201 extending radially inward.

[0051] The upper shell 3 is cylindrical, and the lower end of the upper shell 3 is connected to the upper end of the lower shell 2.

[0052] Guide sleeve 4 is housed in the inner cavity of the lower housing 2 and the inner cavity of the upper housing 3. The lower end of the guide sleeve 4 is threaded to the connector 1. The middle part of the guide sleeve 4 is provided with a threaded connection part 401. The upper end of the guide sleeve 4 is engaged with the upper housing 3.

[0053] The connecting nut 5 is screwed into the threaded connection part 401; the connecting nut 5 abuts against the first flange 201 to press the lower housing 2 onto the connector 1;

[0054] The pneumatic motor assembly 6 is disposed in the inner cavity of the lower housing 2. The input end of the pneumatic motor assembly 6 is connected to the air passage structure 101, and the output end of the pneumatic motor assembly 6 is rotatably fitted in the inner cavity of the guide sleeve 4 and used for external connection of dental surgical instruments.

[0055] In this embodiment, the air passage structure 101 may include an air inlet channel and an exhaust channel provided through the connector 1; the gas supply and exhaust device may include an air supply device connected to the air inlet channel and a gas extraction device connected to the exhaust channel. The gas supply and exhaust device may also be configured to simultaneously connect the air inlet channel and the exhaust channel and simultaneously have air supply and gas extraction functions, which is not limited here. In actual operation, gas is supplied to the pneumatic motor assembly 6 through the air inlet channel, and at the same time, the gas at the pneumatic motor assembly 6 is discharged outward through the exhaust channel, so that a gas flow channel is formed between the air inlet channel, the pneumatic motor assembly 6, and the exhaust channel. In this way, the eccentric structure of the pneumatic motor assembly 6 can be used to generate a pressure difference on both sides of its rotor blades 6022, thereby driving the rotor structure of the pneumatic motor assembly 6 to rotate, and then driving dental surgical tools such as grinding and polishing instruments connected to the pneumatic motor assembly 6 to rotate, so as to complete the dental surgery. For the specific structure and detailed working principle of the pneumatic motor assembly 6, please refer to existing pneumatic motors, which will not be elaborated here.

[0056] Connector 1 can be configured as follows: Figure 1 The elbow structure shown is designed to better accommodate the gas pipeline connection between connector 1 and the gas supply and exhaust equipment.

[0057] The upper end of the connector 1 may be provided with a stepped boss structure, so that the lower end of the lower housing 2 can be sleeved on the boss structure to achieve radial positioning of the lower housing 2. The first flange 201 is provided in the inner cavity of the lower housing 2.

[0058] The lower half of the guide sleeve 4 is located in the inner cavity of the lower housing 2. The lower end of the guide sleeve 4 may be provided with connecting structures such as flanges and ears, so that the connecting structures can be locked to the upper end of the connector 1 from top to bottom by means of threaded fasteners such as bolts. The highest point of the threaded connection part 401 should be located above the upper end face of the first flange 201. In this way, during the process of tightening the connecting nut 5, the connecting nut 5 will gradually move downward relative to the guide sleeve 4 and press against the upper end face of the first flange 201 to apply a downward pressing force to the first flange 201, thereby pressing the lower housing 2 onto the lower connector 1 and achieving relative fixation between the lower housing 2 and the connector 1.

[0059] The upper half of the guide sleeve 4 is exposed outside the lower housing 2, and the lower end of the upper housing 3 is connected to the upper end of the lower housing 2, so that the upper housing 3 covers the upper half of the guide sleeve 4. A corresponding elastic snap-fit ​​structure can be provided between the inner wall of the upper housing 3 and the outer wall of the guide sleeve 4, so as to simultaneously realize the snap-fit ​​fixation between the upper housing 3 and the guide sleeve 4 during the process of fitting the upper housing 3 onto the upper half of the guide sleeve 4 from top to bottom.

[0060] Based on the above structural design, the connection and fixation between the various components can be easily completed. In practical applications, the dental surgical instrument can be inserted into the upper opening of the upper housing 3 from top to bottom, so that the dental surgical instrument can be connected with the output end of the pneumatic motor assembly 6. Then, the power of the pneumatic motor assembly 6 can be transmitted to the dental surgical instrument to drive the dental surgical instrument to rotate and complete the corresponding surgical operation.

[0061] Therefore, the pneumatic dental handpiece provided in this embodiment, based on the connection and cooperation between the connector 1, lower housing 2, guide sleeve 4, connecting nut 5 and lower housing 2, makes the structure simpler and more compact. It can quickly and conveniently complete the disassembly and assembly of the pneumatic dental handpiece without the need for professional tools. While ensuring the basic power output function of the pneumatic motor assembly 6 and ensuring that the dental surgical tools can work normally, it reduces the manufacturing cost of the pneumatic dental handpiece and improves the maintenance efficiency of the pneumatic dental handpiece through convenient disassembly and assembly operations.

[0062] In one embodiment, refer to Figure 2 The guide sleeve 4 has a second flange 402 extending radially outward in the middle. The second flange 402 is located below the threaded connection portion 401. The upper end face of the second flange 402 abuts against the lower end face of the first flange 201. The connecting nut 5 abuts against the upper end face of the first flange 201.

[0063] The pneumatic dental handpiece also includes a connecting bolt 7, which is locked from top to bottom onto the connector 1 by the upper end face of the second flange 402.

[0064] Specifically, the lower end face of the second flange 402 can be directly or indirectly pressed against the upper end of the connector 1. The upper end of the connector 1 can be provided with multiple threaded connection holes at intervals along the circumference. The upper end face of the second flange 402 can be provided with multiple vertical through-holes at intervals along the circumference. The through-holes on the second flange 402 are one-to-one with the threaded connection holes on the connector 1. This makes it easy to pass multiple connecting bolts 7 one-to-one through the through-holes from top to bottom and lock them into the threaded connection holes to achieve the connection and fixation between the guide sleeve 4 and the connector 1.

[0065] After the guide sleeve 4 and the connector 1 are connected and fixed, the lower housing 2 can be sleeved on the upper end of the connector 1 so that the lower end face of the first flange 201 abuts against the upper end face of the second flange 402. Then, by screwing, the connecting nut 5 is pressed against the upper end face of the first flange 201 so that the lower end face of the first flange 201 is tightly attached to the upper end face of the second flange 402. At the same time, the lower end of the lower housing 2 is tightly attached to the upper end of the connector 1. Thus, the connection and fixation between the lower housing 2, the connector 1, and the guide sleeve 4 are achieved in a convenient way, and the connection stability between the components is improved.

[0066] In one embodiment, refer to Figure 2 and Figure 3 The pneumatic dental handpiece also includes an elastic opening retainer 8. The inner periphery of the elastic opening retainer 8 is engaged with the upper end of the guide sleeve 4, and the outer periphery of the elastic opening retainer 8 expands outward based on elastic force and abuts against the inner sidewall of the upper housing 3.

[0067] The outer diameter of the elastic open retaining ring 8 in the unloaded state should be larger than the inner diameter of the corresponding position of the upper housing 3. In this way, during the process of fitting the upper housing 3 onto the upper half of the guide sleeve 4 from top to bottom, the inner wall of the upper housing 3 can drive the elastic open retaining ring 8 to shrink radially inward based on the corresponding chamfer structure. After shrinking, the elastic open retaining ring 8 can abut against the inner wall of the upper housing 3 and apply an elastic force radially outward to the upper housing 3. In this way, the upper housing 3 can be tightened, thereby conveniently realizing the snap-fit ​​fixation between the upper housing 3 and the guide sleeve 4.

[0068] In one embodiment, refer to Figure 2 and Figure 3 The outer periphery of the guide sleeve 4 is provided with a limiting groove 403 around it in the circumferential direction, and the inner periphery of the elastic open retaining ring 8 is engaged in the limiting groove 403.

[0069] By setting the limiting groove 403, the elastic open retaining ring 8 can be axially limited, which can prevent the elastic open retaining ring 8 from axially sliding relative to the guide sleeve 4.

[0070] In one embodiment, refer to Figure 2 and Figure 3 The inner wall of the upper housing 3 is provided with a third flange 301 extending radially inward. The outer periphery of the elastic open retaining ring 8 has an inclined portion 801. The cross-sectional area of ​​the inclined portion 801 gradually increases from bottom to top. Under the elastic force, the inclined portion 801 abuts against the upper turning point of the third flange 301.

[0071] like Figure 3 As shown, when the inclined part 801 abuts against the upper turning point of the third flange 301 under the elastic force, the inclined part 801 can simultaneously apply a downward elastic force and a radially outward elastic force to the third flange 301. Thus, while the upper housing 3 is tensioned radially, the upper housing 3 can be pressed downward against the upper end of the lower housing 2. This enables the connection and fixation between the upper housing 3 and the lower housing 2 in both the axial and radial directions, improving the stability of the connection between the upper housing 3, the lower housing 2, and the guide sleeve 4.

[0072] In one embodiment, refer to Figure 2 and Figure 4The pneumatic motor assembly 6 includes a stator base 601, a pneumatic rotor 602, and a transmission mechanism 603. The stator base 601 is clamped between the guide sleeve 4 and the connector 1. The air chamber of the stator base 601 is connected to the air passage structure 101. The pneumatic rotor 602 is rotatably disposed in the air chamber. The rotor shaft 6021 of the pneumatic rotor 602 is connected to the input end of the transmission mechanism 603. The output end of the transmission mechanism 603 is used to connect external dental surgical tools.

[0073] Specifically, the pneumatic rotor 602 has multiple radially movable rotor blades 6022 spaced circumferentially on its rotor shaft 6021. These rotor blades 6022, under the action of an elastic element, abut against the cavity wall of the air chamber, forming multiple air pressure chambers of varying volumes. During actual operation, gas is supplied to the corresponding air pressure chambers through the air intake channel of the air passage structure 101, while simultaneously being discharged from the corresponding air pressure chambers through the exhaust channel of the air passage structure 101. This creates a gas flow channel between the air intake channel, the pneumatic rotor 602 in the air chamber, and the exhaust channel. The eccentric structure between the air chamber and the pneumatic rotor 602 generates a pressure difference on both sides of the rotor blades 6022, driving the pneumatic rotor 602 to rotate relative to the stator base 601. The rotating rotor shaft 6021 then drives the dental surgical instruments via the transmission mechanism 603 to complete the corresponding dental surgical operation. For the specific structure and detailed working principle of the pneumatic motor assembly 6, please refer to existing pneumatic motors; details are not provided here.

[0074] The transmission mechanism 603 can adopt gear transmission, belt transmission, etc., and the specific design can be based on the transmission ratio and torque requirements, which are not limited here.

[0075] The stator base 601 is clamped between the guide sleeve 4 and the connector 1. Multiple vertical through holes or grooves can be provided on the stator base 601 at intervals along the circumference. These through holes or grooves are aligned with the connecting through holes on the guide sleeve 4 and the threaded connecting holes on the connector 1. In actual installation, the connecting bolts 7 can be passed through the connecting through holes on the guide sleeve 4 and the through holes or grooves on the stator base 601 from top to bottom and finally locked into the threaded connecting holes of the connector 1. In this way, the stator base 601 can be pressed onto the connector 1 by the guide sleeve 4, thereby conveniently realizing the connection and fixation between the guide sleeve 4, the stator base 601, and the connector 1.

[0076] In one embodiment, refer to Figure 2The pneumatic dental handpiece also includes a first connecting seat 9, which is clamped between the guide sleeve 4 and the stator seat 601; the lower end of the rotor shaft 6021 is rotatably connected to the connector 1 through the first bearing 10, the middle part of the rotor shaft 6021 is rotatably connected to the first connecting seat 9 through the second bearing 11, and the upper end of the rotor shaft 6021 is connected to the input end of the transmission mechanism 603.

[0077] The pneumatic dental handpiece also includes a connecting bolt 7, which passes through the guide sleeve 4, the first connecting seat 9, and the stator seat 601 from top to bottom and is locked onto the connector 1.

[0078] By setting the first connecting seat 9, a mounting base can be provided for the second bearing 11, so that the rotor shaft 6021 can be rotatably connected to the fixed part of the pneumatic dental handpiece through the first bearing 10 and the second bearing 11. The rotational stability of the rotor shaft 6021 is ensured by the two connection points (i.e. the connection part between the first bearing 10 and the rotor shaft 6021, and the connection part between the second bearing 11 and the rotor shaft 6021), which can prevent the rotor shaft 6021 from swinging in the radial direction.

[0079] Multiple vertical through holes can be provided at intervals along the circumference on the first connecting seat 9. These through holes correspond one-to-one with the connecting through holes on the guide sleeve 4, the through holes or grooves on the stator base 601, and the threaded connecting holes on the connector 1. In actual installation, the connecting bolts 7 can be passed through the connecting through holes on the guide sleeve 4, the through holes on the first connecting seat 9, and the through holes or grooves on the stator base 601 from top to bottom and finally locked into the threaded connecting holes of the connector 1. In this way, the first connecting seat 9 and the stator base 601 can be pressed onto the connector 1 by the guide sleeve 4, thereby conveniently realizing the connection and fixation between the guide sleeve 4, the first connecting seat 9, the stator base 601, and the connector 1.

[0080] In one embodiment, refer to Figure 2 and Figure 4 The transmission mechanism 603 includes a sun gear 6031, planet gears 6032, a gear ring 6033, and an output shaft 6034. The sun gear 6031 is mounted on the rotor shaft 6021. At least three planet gears 6032 are provided. The at least three planet gears 6032 are circumferentially spaced at the lower end of the output shaft 6034 and surround the sun gear 6031. The sun gear 6031 meshes with the at least three planet gears 6032 for transmission. The upper end of the output shaft 6034 is used to connect dental surgical tools. The gear ring 6033 is mounted in the inner cavity of the guide sleeve 4 and meshes with the at least three planet gears 6032 for transmission.

[0081] Based on the planetary gear transmission of this embodiment, the power output from the rotor shaft 6021 can be precisely transmitted to the output shaft 6034 through the meshing transmission between the sun gear 6031, planet gears 6032, and ring gear 6033. The rotation of the output shaft 6034 then drives dental surgical instruments to complete corresponding dental surgical operations. This planetary gear transmission achieves efficient and precise power transmission and torque amplification, thereby improving the output performance of pneumatic dental handpieces.

[0082] In one embodiment, refer to Figure 2 and Figure 4 The pneumatic dental handpiece also includes a first connecting seat 9 and a second connecting seat 12; the first connecting seat 9 is clamped between the guide sleeve 4 and the stator seat 601, and the middle part of the rotor shaft 6021 is rotatably connected to the first connecting seat 9 through the second bearing 11; the second connecting seat 12 is disposed in the inner cavity of the guide sleeve 4, and the outer periphery of the second connecting seat 12 is provided with a fourth flange 1201 extending radially outward, the gear ring 6033 is clamped between the fourth flange 1201 and the first connecting seat 9, and the middle part of the output shaft 6034 is rotatably connected to the second connecting seat 12 through the third bearing 13.

[0083] By providing the second connecting seat 12, a mounting base can be provided for the third bearing 13, allowing the output shaft 6034 to be rotatably connected to the fixed part of the pneumatic dental handpiece via the third bearing 13; wherein, the third bearing 13 can be as follows: Figure 2 and Figure 4 The configuration shown is two and arranged at intervals in the vertical direction, so as to ensure the rotational stability of the output shaft 6034 through two connection points (i.e. the upper and lower connection points between the third bearing 13 and the output shaft 6034), and to prevent the output shaft 6034 from swaying in the radial direction.

[0084] Meanwhile, by setting the second connecting seat 12, the gear ring 6033 can be pressed onto the first connecting seat 9 by utilizing the cooperation between the fourth flange 1201 on the second connecting seat 12 and the guide sleeve 4, thereby conveniently realizing the connection and fixation between the guide sleeve 4, the gear ring 6033, the first connecting seat 9, and the second connecting seat 12.

[0085] In one embodiment, refer to Figure 2 and Figure 4The output shaft 6034 includes a first shaft 60341 and a second shaft 60342; at least three planetary gears 6032 are circumferentially spaced at the lower end of the first shaft 60341; the middle part of the first shaft 60341 is rotatably connected to the second connecting seat 12 via a third bearing 13; the upper end of the first shaft 60341 is connected to the lower end of the second shaft 60342; the middle part of the second shaft 60342 is rotatably connected to the upper end of the guide sleeve 4 via a fourth bearing 14; the upper end of the second shaft 60342 extends outward from the upper end of the guide sleeve 4 and is opposite to the insertion interface 302 of the upper housing 3; the second shaft 60342 is used to connect dental surgical tools.

[0086] By configuring the output shaft 6034 as a separate first shaft 60341 and second shaft 60342, disassembly and maintenance can be easily performed as needed, thereby further improving the ease of use of the pneumatic dental handpiece. The lower end of the second shaft 60342 can be provided with an axially extending insertion hole, into which the upper end of the first shaft 60341 can be axially inserted. A locating pin is then radially inserted into both the first and second shafts 60341 and 60342. Dental surgical instruments can be inserted into the inner cavity of the upper housing 3 via the insertion interface 302 and dock with the upper end of the second shaft 60342. Based on this configuration, the connection between the first shaft 60341 and the second shaft 60342 can be easily achieved, as can the connection between the dental surgical instruments and the second shaft 60342. This allows the power from the first shaft 60341 to be stably transmitted to the second shaft 60342, thereby driving the dental surgical instruments to rotate and complete the corresponding dental surgical operations.

[0087] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pneumatic dental handpiece, characterized in that, The pneumatic dental handpiece includes: The connector has an internal air passage structure, which is used to connect to external gas supply and exhaust equipment. The lower housing is cylindrical in shape, with its lower end fitted onto the connector, and its upper end having a first flange extending radially inward. The upper shell is cylindrical, and the lower end of the upper shell is connected to the upper end of the lower shell. A guide sleeve is housed in the inner cavity of the lower housing and the inner cavity of the upper housing. The lower end of the guide sleeve is threaded to the connector, and the middle part of the guide sleeve is provided with a threaded connection part. The upper end of the guide sleeve is engaged with the upper housing. A connecting nut is screwed onto the threaded connection portion; the connecting nut abuts against the first flange to press the lower housing onto the connector; A pneumatic motor assembly is disposed in the inner cavity of the lower housing. The input end of the pneumatic motor assembly is connected to the air passage structure, and the output end of the pneumatic motor assembly is rotatably fitted into the inner cavity of the guide sleeve and used for external connection of dental surgical instruments.

2. The pneumatic dental handpiece as described in claim 1, characterized in that, The guide sleeve has a second flange extending radially outward in the middle. The second flange is located below the threaded connection portion. The upper end face of the second flange abuts against the lower end face of the first flange. The connecting nut abuts against the upper end face of the first flange. The pneumatic dental handpiece also includes a connecting bolt, which is locked to the connector from top to bottom by the upper end face of the second flange.

3. The pneumatic dental handpiece as described in claim 1, characterized in that, The pneumatic dental handpiece also includes an elastic opening retainer ring, the inner periphery of which is engaged with the upper end of the guide sleeve, and the outer periphery of which expands outward based on elastic force and abuts against the inner sidewall of the upper housing.

4. The pneumatic dental handpiece as described in claim 3, characterized in that, The outer periphery of the guide sleeve is provided with a limiting groove around it in the circumferential direction, and the inner periphery of the elastic open retaining ring is engaged in the limiting groove.

5. The pneumatic dental handpiece as described in claim 3, characterized in that, The inner wall of the upper housing is provided with a third flange extending radially inward, and the outer periphery of the elastic open retaining ring has an inclined portion. The cross-sectional area of ​​the inclined portion gradually increases from bottom to top, and the inclined portion abuts against the upper turning point of the third flange under elastic force.

6. The pneumatic dental handpiece as described in claim 1, characterized in that, The pneumatic motor assembly includes a stator base, a pneumatic rotor, and a transmission mechanism. The stator base is clamped between the guide sleeve and the connector. The air cavity of the stator base is connected to the air passage structure. The pneumatic rotor is rotatably disposed in the air cavity. The rotor shaft of the pneumatic rotor is connected to the input end of the transmission mechanism. The output end of the transmission mechanism is used to connect dental surgical tools.

7. The pneumatic dental handpiece as described in claim 6, characterized in that, The pneumatic dental handpiece further includes a first connecting seat, which is clamped between the guide sleeve and the stator base; the lower end of the rotor shaft is rotatably connected to the connector through a first bearing, the middle part of the rotor shaft is rotatably connected to the first connecting seat through a second bearing, and the upper end of the rotor shaft is connected to the input end of the transmission mechanism. The pneumatic dental handpiece also includes a connecting bolt, which passes through the guide sleeve, the first connecting seat, and the stator seat from top to bottom and is locked onto the connector.

8. The pneumatic dental handpiece as described in claim 6, characterized in that, The transmission mechanism includes a sun gear, planet gears, a gear ring, and an output shaft. The sun gear is mounted on the rotor shaft. There are at least three planet gears, which are circumferentially spaced at the lower end of the output shaft and surround the sun gear. The sun gear meshes with the at least three planet gears for transmission. The upper end of the output shaft is used to connect dental surgical tools. The gear ring is located in the inner cavity of the guide sleeve and meshes with the at least three planet gears for transmission.

9. The pneumatic dental handpiece as described in claim 8, characterized in that, The pneumatic dental handpiece further includes a first connecting seat and a second connecting seat; the first connecting seat is clamped between the guide sleeve and the stator base, and the middle part of the rotor shaft is rotatably connected to the first connecting seat through a second bearing; the second connecting seat is disposed in the inner cavity of the guide sleeve, and the outer periphery of the second connecting seat is provided with a fourth flange extending radially outward, the gear ring is clamped between the fourth flange and the first connecting seat, and the middle part of the output shaft is rotatably connected to the second connecting seat through a third bearing.

10. The pneumatic dental handpiece as described in claim 9, characterized in that, The output shaft includes a first shaft and a second shaft; at least three planetary gears are circumferentially spaced at the lower end of the first shaft, the middle part of the first shaft is rotatably connected to the second connecting seat through the third bearing, the upper end of the first shaft is connected to the lower end of the second shaft, the middle part of the second shaft is rotatably connected to the upper end of the guide sleeve through the fourth bearing, the upper end of the second shaft extends outward from the upper end of the guide sleeve and is opposite to the insertion interface of the upper housing, and the second shaft is used to connect dental surgical tools.

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