Dental handpieces and dental instruments

Abstract

The embodiment of the present invention provides a dental handpiece and a dental treatment instrument, which relate to the technical field of oral medical devices. The dental handpiece includes a body shell, a head shell, a drive motor and a clamping member. The head shell is connected to one end of the body shell, and the inner cavity of the body shell is connected to the inner cavity of the head shell. The other end of the body shell is used to connect an operating handle. The drive motor is arranged in the body shell, and the output shaft of the drive motor extends into the head shell. The clamping member is used to clamp the working tip. The clamping member is arranged in the head shell and is transmission-connected to the output shaft of the drive motor at an angle so as to rotate under the drive of the drive motor. The intermediate transmission is omitted, the number of parts is reduced, the production process is short, and the assembly requirements are low. At the same time, the overall size of the dental handpiece can also be reduced, which meets the requirements of green engineering and lightweight design.

Description

Technical Field

[0001] The invention relates to the technical field of oral medical instruments, and in particular to a dental mobile phone and a dental therapeutic instrument. Background Art

[0002] Root canal therapy, also known as endodontic therapy, is a surgical procedure in dentistry to treat pulp necrosis and root infection. Root canal therapy mainly targets the inside of the tooth and is the most effective treatment for acute pulpitis. By removing the necrotic tissue in the pulp cavity and then refilling the pulp cavity after disinfection, the compression and stimulation of the diseased tissue on the dental nerve can be relieved to prevent the tooth from further deteriorating. When performing root canal therapy, in order to reduce the treatment time and relieve the patient's pain, it is usually necessary to use a dental mobile phone to assist in the treatment.

[0003] Dental handpieces are mainly equipment for grinding, polishing and cutting during dental surgery. Currently, dental handpieces mainly use drive motors as the driving source, and then use gears and drive shafts for transmission, resulting in as many as 25 or more parts, complex structure and heavy overall weight. In addition, the production process is long, the cost is high, and the assembly requirements are high, which makes it difficult to reduce carbon emissions and the total cost remains high. Summary of the invention

[0004] The purpose of the present invention is to provide a dental handpiece and a dental treatment instrument, which eliminate the intermediate transmission, reduce the number of parts, shorten the production process, and have low assembly requirements. At the same time, the overall size of the dental handpiece can also be reduced, meeting the requirements of green engineering and lightweight design.

[0005] In a first aspect, the present invention provides a dental handpiece, comprising:

[0006] A body shell and a head shell connected to one end of the body shell, wherein the inner cavity of the body shell is connected to the inner cavity of the head shell;

[0007] A drive motor is disposed in the body shell, and an output shaft of the drive motor extends into the head shell;

[0008] The clamping member is used for clamping the working tip, is arranged in the head housing, and is transmission-connected with the output shaft of the driving motor at an angle so as to rotate under the drive of the driving motor.

[0009] In an optional embodiment, a first bevel gear circumferentially surrounding the clamping member is disposed on the periphery, and a second bevel gear circumferentially surrounding the end of the output shaft of the drive motor is disposed on the periphery, and the first bevel gear is meshed with the second bevel gear.

[0010] In an optional embodiment, a first limiting surface is provided in the body shell, which is at an angle to the body shell's axis, and one end of the motor shell of the drive motor from which the output shaft extends is in contact with the first limiting surface;

[0011] The dental handpiece also includes a locking piece and a plug, wherein the locking piece is detachably engaged in the other end of the body shell and abuts against the end of the motor shell away from the clamping piece, wherein the locking piece has a penetrating mounting hole, the plug is engaged in the mounting hole and is electrically connected to the drive motor.

[0012] In an optional embodiment, the mounting hole includes a first hole segment and a second hole segment that are coaxially connected, the first hole segment is farther away from the head housing than the second hole segment, the inner diameter of the first hole segment is smaller than the inner diameter of the second hole segment, and a first step surface is formed between the first hole segment and the second hole segment;

[0013] The plug is matched with the first hole segment and is partially located in the second hole segment, wherein the portion of the plug located in the second hole segment has a first protrusion extending in the radial direction, and one end surface of the first protrusion is in contact with the first step surface;

[0014] The dental handpiece further comprises a first sleeve, the first sleeve is fitted in the second hole section, and the first sleeve is abutted between the other end surface of the first protrusion and the motor housing.

[0015] In an optional embodiment, the inner hole of the first sleeve includes a coaxially connected mating hole section and a accommodating hole section, the mating hole section is away from the head housing relative to the accommodating hole section, the inner diameter of the mating hole section is larger than the inner diameter of the accommodating hole section, the second step surface is formed between the mating hole section and the accommodating hole section, the first protrusion is mated with the mating hole section, the plug portion is accommodated in the accommodating hole section, and the second step surface is in contact with the other end surface of the first protrusion.

[0016] In an optional embodiment, the dental mobile phone further comprises a second sleeve and a bearing, wherein the second sleeve is fitted in the body shell, the bearing is fitted in the second sleeve, and the output shaft is passed through the second sleeve and the bearing, wherein an area on the outer peripheral wall of the second sleeve away from the head shell has a second protrusion protruding radially, one end face of the second protrusion is fitted with the first limiting surface, and an end face of the second sleeve away from the head shell is fitted with the motor shell.

[0017] In an optional embodiment, the inner circumferential wall of the second sleeve is provided with a circumferentially surrounding groove, the groove is away from the head housing relative to the bearing, and a sealing ring is provided between the groove and the output shaft.

[0018] In an optional embodiment, the inner circumferential wall of the second sleeve is provided with a first curved portion which is circumferentially surrounding, and the first curved portion is away from the head housing relative to the bearing. The outer circumferential wall of the output shaft is provided with a second curved portion which is circumferentially surrounding, and the first curved portion and the second curved portion are adapted to each other to form a labyrinth dynamic seal.

[0019] In an optional embodiment, the first bending portion includes a first inner ring, a first connecting ring and a first outer ring, the first outer ring is matched with the inner hole of the second sleeve and is arranged outside the first inner ring, the first connecting ring is connected between one end of the first inner ring and one end of the first outer ring, and the first inner ring, the first connecting ring and the first outer ring jointly form a first matching groove;

[0020] The second bending portion includes a second inner ring, a second connecting ring and a second outer ring, the second inner ring is matched with the output shaft, the second outer ring is arranged outside the second inner ring, the second connecting ring is connected between one end of the second inner ring and one end of the second outer ring, and the second inner ring, the second connecting ring and the second outer ring jointly form a second matching groove;

[0021] The openings of the first mating groove and the second mating groove face opposite to each other, the first inner ring can be movably inserted into the second mating groove, and the second outer ring can be movably inserted into the first mating groove.

[0022] In a second aspect, the present invention provides a dental treatment device, comprising:

[0023] A dental handpiece as described in any of the preceding embodiments;

[0024] An operating handle is connected to the other end of the fuselage shell.

[0025] The dental handpiece and dental treatment instrument of the embodiment of the present invention are provided with a driving motor directly in the body shell, and the output shaft of the driving motor is directly connected to the clamping member in transmission, and the output shaft of the driving motor is arranged at an angle with the clamping member, so that when the clamping member clamps the working tip of the turning needle, root canal file, etc., the working tip extends out of the head shell in a direction at an angle with the body shell, so that when the output shaft of the driving motor rotates, the clamping member can be driven to drive the working tip of the turning needle, root canal file, etc. to rotate, eliminating the intermediate transmission, reducing the number of parts, shortening the production process, and reducing the assembly requirements. At the same time, the overall size of the dental handpiece can also be reduced, meeting the requirements of green engineering and lightweight design. In addition, since the driving motor is moved to the body shell, the space in the operating handle is increased, which can carry a larger power supply and more control components, thereby improving the functional diversity of the dental handpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a cross-sectional view of a dental handpiece according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A magnified view of part A;

[0029] Figure 3 for Figure 1 A magnified view of part B;

[0030] Figure 4 for Figure 1 Enlarged view of part C;

[0031] Figure 5 is a cross-sectional view of a fuselage shell according to an embodiment of the present invention;

[0032] Figure 6 is a cross-sectional view of a locking member according to an embodiment of the present invention;

[0033] Figure 7 is a cross-sectional view of a first sleeve according to an embodiment of the present invention;

[0034] Figure 8 A partial cross-sectional view of a dental mobile phone according to another embodiment of the present invention;

[0035] Fig. 9 is a cross-sectional view of a first bending portion of another embodiment of the present invention;

[0036] Fig.10 It is a cross-sectional view of the second bending portion of another embodiment of the present invention.

[0037] Icons: 10-head housing; 12-clamping piece; 121-needle clamping spring; 123-shaft core; 14-first bevel gear; 16-first shaft core bearing; 18-second shaft core bearing; 30-body housing; 300-first limit surface; 301-connecting hole section; 303-main hole section; 305-through hole section; 307-second limit surface; 32-drive motor; 321-output shaft; 323-motor housing; 325-second bevel gear; 34-locking piece; 341-mounting hole; 3410-first hole section; 3412-second hole section; 3414-first step surface; 343-connecting section; 345-matching section; 347-third limit surface; 36 -plug; 361-first protrusion; 363-circuit; 37-bearing; 38-first bushing; 381-matching hole section; 383-accommodating hole section; 385-second step surface; 39-second bushing; 390-second protrusion; 392-groove; 52-back cover; 54-support body; 541-support part; 56-elastic member; 58-bearing seat; 70-sealing ring; 80-first bending part; 801-first inner ring; 803-first connecting ring; 805-first outer ring; 807-first matching groove; 90-second bending part; 901-second inner ring; 903-second connecting ring; 905-second outer ring; 907-second matching groove. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "connected", "connected", and "fitted" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements; it can be a direct fit or an indirect fit through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0045] The embodiment of the present invention provides a dental treatment device, which at least includes a connected operating handle and a dental handpiece, and various functional elements are arranged on the operating handle to control the dental handpiece. Figure 1 The dental handpiece includes a body shell 30, a head shell 10, a driving motor 32 and a clamping member 12. The head shell 10 is connected to one end of the body shell 30, and the inner cavity of the body shell 30 is connected to the inner cavity of the head shell 10. The other end of the body shell 30 is used to connect the operating handle. The driving motor 32 is arranged in the body shell 30, and the output shaft 321 of the driving motor 32 extends into the head shell 10. The clamping member 12 is used to clamp the working tip. The clamping member 12 is arranged in the head shell 10 and is transmission-connected to the output shaft 321 of the driving motor 32 at an angle so as to rotate under the drive of the driving motor 32.

[0046] Thus, by directly setting the driving motor 32 in the body shell 30, the output shaft 321 of the driving motor 32 is directly connected to the clamping member 12, and the output shaft 321 of the driving motor 32 is set at an angle with the clamping member 12, so that when the clamping member 12 clamps the working tip of the turning needle, root canal file, etc., the working tip extends out of the head shell 10 in a direction that is at an angle with the body shell 30, so that when the output shaft 321 of the driving motor 32 rotates, the clamping member 12 can be driven to drive the working tip of the turning needle, root canal file, etc. to rotate, eliminating the intermediate transmission, reducing the number of parts, shortening the production process, and reducing the assembly requirements. At the same time, the overall size of the dental mobile phone can also be reduced, meeting the requirements of green engineering and lightweight design. In addition, since the driving motor 32 is moved to the body shell 30, the space in the operating handle is increased, which can carry a larger power supply and more control components, thereby improving the functional diversity of the dental mobile phone.

[0047] The inner cavity of the head housing 10 and the inner cavity of the body housing 30 are both cylindrical, and the inner cavity of the head housing 10 and the inner cavity of the body housing 30 intersect each other. The clamping member 12 is coaxial with the head housing 10, that is, the axis of the clamping member 12 and the axis of the head housing 10 are both coincident with the preset axis, so that the clamping member 12 can drive the working tip to rotate with the preset axis as the central axis, and the output shaft 321 of the driving motor 32 is coaxial with the head housing 10. A first bevel gear 14 is provided around the periphery of the clamping member 12, and a second bevel gear 325 is provided around the end of the output shaft 321 of the driving motor 32. The first bevel gear 14 and the second bevel gear 325 are meshed, so that when the output shaft 321 of the driving motor 32 rotates, the rotation of the clamping member 12 can be realized through the meshing transmission of the first bevel gear 14 and the second bevel gear 325.

[0048] For further information, please refer to Figure 1 and Figure 2The head housing 10 is open at both ends on the preset axis. The clamping member 12 includes a needle clamping spring 121 and a shaft core 123. The shaft core 123 is roughly in the shape of a hollow circular tube, and the axis of the shaft core 123 coincides with the preset axis. The needle clamping spring 121 is roughly in the shape of a hollow tube, and its axis also coincides with the preset axis. The needle clamping spring 121 is inserted into the shaft core 123 and fixed relative to the shaft core 123. The working tip can be inserted into or removed from the needle clamping spring 121 from one end of the head housing 10. The outer peripheral wall of the shaft core 123 is provided with the above-mentioned first bevel gear 14, so that when the output shaft 321 of the driving motor 32 rotates, the shaft core 123 drives the needle clamping spring 121 to rotate around the preset axis, so that the working tip clamped by the needle clamping spring 121 rotates around the preset axis. Among them, the first bevel gear 14 can be integrally connected to the shaft core 123, or can be a split connection that is sleeved outside the shaft core 123 and fixed relative to the shaft core 123. The specific connection method is not limited. As long as the first bevel gear 14 and the shaft core 123 can be relatively fixed, when the first bevel gear 14 rotates around the preset axis, it can drive the shaft core 123 to rotate around the preset axis.

[0049] The other end of the machine head housing 10 is provided with a rear cover 52 assembly, which includes a rear cover 52 and a support body 54. The support body 54 is annular and provided with a through hole whose axis extends along a preset axis. The support body 54 is provided at the other end of the machine head housing 10. The rear cover 52 is provided on the side of the support body 54 away from the clamping member 12 and is spaced from the clamping needle spring 121. The rear cover 52 can move toward the clamping needle spring 121 under the action of an external force to contact the clamping needle spring 121 and expand the clamping needle spring 121, so that the working tip can be taken out of the clamping needle spring 121 or inserted into the clamping needle spring 121, so as to achieve the replacement and maintenance of the working tip.

[0050] The rear cover 52 assembly also includes an elastic member 56. The inner peripheral wall of the support body 54 has a support portion 541 extending radially inward, and the support portion 541 is annular. The elastic member 56 is held between the rear cover 52 and the support portion 541. Therefore, when the rear cover 52 is moved toward the needle clamping spring 121 by an external force, the elastic member 56 is compressed, and the rear cover 52 will gradually approach and contact the needle clamping spring 121, so that the needle clamping spring 121 expands, thereby replacing the working tip. After the working tip is reinserted into the needle clamping spring 121, the rear cover 52 is released, so that the elastic member 56 rebounds and applies a thrust to the rear cover 52, so that the rear cover 52 moves in a direction away from the needle clamping spring 121, and the needle clamping spring 121 gradually returns to the original tightened state to clamp the working tip. Among them, the elastic member 56 can be a tubular element that can undergo elastic deformation, such as a coil spring, a bellows, etc., and the elastic member 56 surrounds the outer periphery of the needle clamping spring 121.

[0051] Specifically, the rear cover 52 assembly also includes a bearing seat 58, which is annular and is disposed between the head housing 10 and the support body 54. The outer circumference of the bearing seat 58 is provided with an external thread, and the inner circumference of the head housing 10 is provided with an internal thread, so that the bearing seat 58 and the head housing 10 are connected by threaded engagement. A portion of the outer circumference of the bearing seat 58 is located outside the head housing 10, and the inner circumference of the bearing seat 58 is provided with the above-mentioned support portion 541, and the elastic member 56 is supported between the bearing seat 58 and the rear cover 52. The inner circumference of the support body 54 is also provided with an internal thread, so that the support body 54 and the bearing seat 58 are connected by threaded engagement of the support body 54 with the portion of the bearing seat 58 located outside the head housing 10.

[0052] A first shaft core bearing 16 and a second shaft core bearing 18 are also provided in the head housing 10. The first shaft core bearing 16 is located at one end of the head housing 10, and the second shaft core bearing 18 is located at the other end of the head housing 10. The first shaft core bearing 16 and the second shaft core bearing 37 are both coaxial with the preset axis. The clamping member is passed through the first shaft core bearing 16 and the second shaft core bearing 18, that is, the shaft core 123 is passed through the first shaft core bearing 16 and the second shaft core bearing 18, and the first bevel gear 14 is located between the first shaft core bearing 16 and the second shaft core bearing 18. Therefore, the first shaft core bearing 16 and the second shaft core bearing 18 play a role in improving the rotation accuracy of the clamping member 12 and reducing the rotation smoothness of the clamping member 12.

[0053] Please refer to Figure 1 , Figure 3 and Figure 4 A first limiting surface 300 is provided in the body shell 30, which is at an angle to the axial direction thereof. One end of the motor shell 323 of the driving motor 32 extending with the output shaft 321 is in contact with the first limiting surface 300, thereby preventing the driving motor 32 from moving toward the head shell 10. The dental handpiece further comprises a locking member 34 and a plug 36. The locking member 34 is detachably fitted in the other end of the body shell 30, and abuts against one end of the motor shell 323 away from the clamping member 12, thereby preventing the driving motor 32 from moving in a direction away from the head shell 10. Thus, by limiting the axial movement of the driving motor 32, the first bevel gear and the second bevel gear 325 are prevented from being too tight or too loose in meshing, or even out of meshing, thereby ensuring the transmission stability between the driving motor 32 and the clamping member 12. Among them, the locking member 34 has a through mounting hole 341, the plug 36 is fitted into the mounting hole 341, and is electrically connected to the drive motor 32, that is, the plug 36 is electrically connected to the drive motor 32 through the circuit 363, and the part of the plug 36 located outside the body shell 30 is used to be electrically connected to the power supply in the operating handle, so that the power supply can supply energy to the drive motor 32 so that the output shaft 321 of the drive motor 32 can rotate.

[0054] The locking piece 34 is mainly in the shape of a circular ring, and its outer peripheral wall is provided with an external thread, and the body shell 30 is provided with an internal thread, so that the locking piece 34 is fixed relative to the body shell 30 through the engagement of the external thread and the internal thread, and can be pressed against the motor shell 323 of the drive motor 32. At the same time, it can also well achieve the sealing between the locking piece 34 and the body shell 30, preventing water vapor from entering the body shell 30 through the gap between the body shell 30 and the locking piece 34 when the dental mobile phone is working, causing the drive motor 32 to be damaged by moisture.

[0055] For more details, please refer to Figure 5 The inner cavity of the fuselage shell 30 can be divided into a connecting hole section 301, a main hole section 303 and a through hole section 305 which are coaxially connected in sequence and have decreasing diameters in sequence. The connecting hole section 301 is far away from the head shell 10 relative to the main hole section 303, and the through hole section 305 is directly connected to the inner cavity of the head shell 10. The motor housing 323 of the drive motor 32 is located in the main hole section 303. The above-mentioned first limit surface 300 is formed between the through hole section 305 and the main hole section 303, and a second limit surface 307 is formed between the connecting hole section 301 and the main hole section 303.

[0056] Please combine Figure 5 refer to Figure 1 , Figure 3 and Figure 6 The locking member 34 can be divided into a coaxially connected connecting section 343 and a matching section 345. The outer diameter of the connecting section 343 is larger than the outer diameter of the matching section 345, so that a third limiting surface 347 is formed between the connecting section 343 and the matching section 345. The matching section 345 is matched in the main hole section 303, and the end surface of the matching section 345 away from the connecting section 343 is in contact with the motor housing 323 to limit the axial movement of the driving motor 32. The connecting section 343 is matched in the connecting hole section 301, and the second limiting surface 307 and the third limiting surface 347 are in contact with each other, so as to achieve the fixing of the locking member 34 relative to the body shell 30 and ensure the sealing between the body shell 30 and the locking member 34. Among them, the outer peripheral wall of the connecting hole section 301 is provided with an internal thread, and the outer peripheral wall of the connecting section 343 is provided with an external thread, so that the connecting hole section 301 is in contact with the connecting hole thread.

[0057] The mounting hole 341 includes a first hole section 3410 and a second hole section 3412 which are coaxially connected. The first hole section 3410 is farther away from the head housing 10 than the second hole section 3412. The inner diameter of the first hole section 3410 is smaller than the inner diameter of the second hole section 3412. A first step surface 3414 is formed between the first hole section 3410 and the second hole section 3412. The plug 36 is matched with the first hole section 3410 and is partially located in the second hole section 3412. The portion of the plug 36 located in the second hole section 3412 has a first protrusion 361 extending in the radial direction, and one end surface of the first protrusion 361 is in contact with the first step surface 3414. The dental handpiece further comprises a first sleeve 38, which is fitted in the second hole section 3412, and is abutted between the other end surface of the first protrusion 361 and the motor housing 323, thereby achieving fixation of the plug 36 and sealing between the plug 36 and the locking member 34. Since the locking member 34 and the body shell 30 are also sealed, moisture will not enter the motor housing 323 when the dental handpiece is working or is sterilized by steaming.

[0058] Please refer to Figure 7 The inner hole of the first sleeve 38 includes a coaxially connected matching hole section 381 and a receiving hole section 383. The matching hole section 381 is farther from the head housing 10 than the receiving hole section 383. The inner diameter of the matching hole section 381 is larger than the inner diameter of the receiving hole section 383. A second step surface 385 is formed between the matching section 345 and the receiving hole section 383. The first protrusion 361 is matched with the matching hole section 381. The plug 36 is partially received in the receiving hole section 383. The second step surface 385 is in contact with the other end surface of the first protrusion 361. The first sleeve 38 and the second hole section 3412 are interference fit to better ensure sealing.

[0059] Please continue to refer to Figure 1 The dental handpiece further comprises a second sleeve 39 and a bearing 37. The second sleeve 39 is arranged in the body shell 30. Specifically, the second sleeve 39 cooperates with and is fixed to the through hole section 305 of the body shell 30. The bearing 37 is arranged in the second sleeve 39. The output shaft 321 is passed through the first sleeve 38 and the bearing 37, so as to protect the output shaft 321 and improve the smoothness and accuracy of the rotation of the output shaft 321, thereby ensuring the accuracy and smoothness of the rotation of the clamp 12. Among them, the outer peripheral wall of the second sleeve 39 has a second protrusion 390 protruding in the radial direction in the area away from the head shell 10. One end face of the second protrusion 390 is in contact with the first limit surface 300. The end face of the second sleeve 39 away from the head shell 10 is in contact with the motor housing 323 to limit the axial movement of the drive motor 32.

[0060] The second bevel gear 325 can be connected to the output shaft 321 in an integral manner, or can be sleeved outside the output shaft 321 and connected in a split manner fixed relative to the shaft core 123. The specific connection method is not limited, and the main thing is to ensure that the second bevel gear 325 is fixed relative to the shaft core 123. For example, the second bevel gear 325 is a separate component, sleeved at the end of the output shaft 321. When the drive motor 32 is fixed in the body shell 30, the bearing 37 is first fixed in the second sleeve 39, and then the output shaft 321 of the drive motor 32 is passed through the second sleeve 39 and extends from the second sleeve 39 and the bearing 37, and then the second bevel gear 325 is sleeved on the end of the output shaft 321 extending from the second sleeve 39 and the bearing 37; then the combination of the first sleeve 38, the locking member 34 and the plug 36 is inserted into the body shell 30, and the locking member 34 is screwed so that the external thread on the locking member 34 is meshed with the internal thread in the body shell 30 until the second step surface 385 and the third step surface are in contact. At the same time, the contact between the outer peripheral wall of the second sleeve 39 and the inner peripheral wall of the through-hole section 305 can also ensure the tight fit and sealing between the second sleeve 39 and the body shell 30.

[0061] Please continue to refer to Figure 3 In addition, in order to prevent water vapor from entering the motor housing 323 from the handpiece housing 10 when the dental handpiece is working or steam sterilized, a circumferentially surrounding groove 392 is provided on the inner peripheral wall of the second sleeve 39. The groove 392 is away from the handpiece housing 10 relative to the bearing 37. A sealing ring 70 is provided between the groove 392 and the output shaft 321, thereby achieving the sealing between the second sleeve 39 and the output shaft 321, and the matching sealing between the second sleeve 39 and the ghost hole section further improves the sealing of the drive motor 32 in the body housing 30, ensuring that water vapor does not enter the motor housing 323. Among them, the sealing ring 70 is a shaped ring, a Y-shaped ring, a V-shaped ring, etc., and the number of the sealing ring 70 is not limited, and can be one or more than two.

[0062] Of course, the sealing between the second sleeve 39 and the output shaft 321 is not limited to the above-mentioned provision of the sealing ring 70. For example, please refer to Figure 8 In some embodiments, the inner circumferential wall of the second sleeve 39 is provided with a first curved portion 80 which is circumferentially surrounded. The first curved portion 80 is away from the head housing 10 relative to the bearing 37. The outer circumferential wall of the output shaft 321 is provided with a second curved portion 90 which is circumferentially surrounded. The first curved portion 80 and the second curved portion 90 are matched with each other and are filled with oil to jointly form a labyrinth dynamic seal.

[0063] Specifically, please refer to Figures 8 to 10The first bending portion 80 is located in the groove 392 and is coaxial with the output shaft 321. The first bending portion 80 includes a first inner ring 801 and a first outer ring 805 surrounding the first inner ring 801. One end of the first inner ring 801 and one end of the first outer ring 805 are connected by a first connecting ring 803, so that the first inner ring 801, the first connecting ring 803 and the first outer ring 805 together form a first matching groove 807, and the opening direction of the first matching groove 807 faces the motor housing 323. The ring 803 fits with the side wall of the groove 392, and the first outer ring 805 and the second sleeve 39 have an interference fit, that is, the outer peripheral wall of the first outer ring 805 fits with the bottom wall of the groove 392, and the axial length of the first outer ring 805 can be greater than the axial length of the first inner ring 801, so that the other end of the first outer ring 805 fits with the motor housing 323, and the other end of the first inner ring 801 will have a distance from the motor housing 323, while ensuring the fixation of the first curved portion 80 relative to the motor housing 323 and the second sleeve 39.

[0064] The second zigzag portion 90 includes an interference fit coaxially with the output shaft 321, and includes a second inner ring 901 and a second outer ring 905 surrounding the second inner ring 901. One end of the second inner ring 901 and one end of the second outer ring 905 are connected through a second connecting ring 903, and the second inner ring 901 is interference fit with the output shaft 321, so that the second zigzag portion 90 is fixed relative to the output shaft 321. The second inner ring 901, the second connecting ring 903 and the second outer ring 905 together form a second matching groove 907, the opening direction of the second matching groove 907 faces the head housing 10, and the second connecting ring 903 is attached to the motor housing 323. Among them, the size relationship between the axial length of the second inner ring 901 and the axial length of the second inner ring 901 is not limited.

[0065] The first inner ring 801 can be movably inserted in the second matching groove 907, the first connecting ring 803 is located between the second outer ring 905 and the side wall of the groove 392, the second outer ring 905 can be movably inserted in the first matching groove 807, and the second connecting ring 903 is located between the first inner ring 801 and the motor housing 323, so as to realize the dynamic sealing cooperation between the output shaft 321 and the second sleeve 39.

[0066] Of course, it should be noted that the opening direction of the above-mentioned first matching groove 807 can also be toward the head housing 10, that is, the first connecting ring 803 is attached to the motor housing 323, and the first inner ring 801 is at a distance from the side wall of the groove 392, and the corresponding opening direction of the second matching groove 907 is toward the motor housing 323, the second connecting ring 903 is attached to the side wall of the groove 392, and the second outer ring 905 is at a distance from the motor housing 323. As long as the opening direction of the first matching groove 807 and the opening direction of the second matching groove 907 are opposite to each other, so that the first inner ring 801 can be movably inserted in the second matching groove 907, and the second outer ring 905 can be movably inserted in the first matching groove 807, when the output shaft 321 drives the second curved portion 90 to rotate, the first curved portion 80 and the second curved portion 90 can rotate relative to each other, and dynamic sealing can be achieved.

[0067] In summary, the dental handpiece and dental treatment instrument of the embodiment of the present invention directly set the driving motor 32 in the body shell 30, the output shaft 321 of the driving motor 32 is directly connected to the clamping member 12, and the output shaft 321 of the driving motor 32 is set at an angle with the clamping member 12, so that when the clamping member 12 clamps the working tip of the needle, root canal file, etc., the working tip extends out of the head shell 10 in a direction at an angle with the body shell 30, so that when the output shaft 321 of the driving motor 32 rotates, the clamping member 12 can be driven to drive the working tip of the needle, root canal file, etc. to rotate, eliminating the intermediate transmission, reducing the number of parts, shortening the production process, and reducing the assembly requirements. At the same time, the overall size of the dental handpiece can also be reduced, meeting the requirements of green engineering and lightweight design. In addition, since the driving motor 32 is moved to the body shell 30, the space in the operating handle is increased, which can carry a larger power supply and more control components, thereby improving the functional diversity of the dental handpiece.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dental handpiece, characterized in that: include: A body shell and a head shell connected to one end of the body shell, wherein the inner cavity of the body shell is connected to the inner cavity of the head shell; A drive motor is disposed in the body shell, and an output shaft of the drive motor extends into the head shell; A clamping member, used for clamping the working tip, is disposed in the head housing and is transmission-connected to the output shaft of the drive motor at an angle so as to rotate under the drive of the drive motor; A first limiting surface is provided in the body shell, which is at an angle to the axial direction thereof, and one end of the motor shell of the drive motor from which the output shaft extends is in contact with the first limiting surface; The dental handpiece further comprises a locking member and a plug, wherein the locking member is detachably fitted in the other end of the body shell and abuts against the end of the motor shell away from the clamping member, wherein the locking member has a through mounting hole, the plug is fitted in the mounting hole and is electrically connected to the drive motor; Wherein, the locking member is in a circular ring shape, the outer peripheral wall of the locking member is provided with an external thread, the fuselage shell is provided with an internal thread, and the external thread and the internal thread are meshed; The mounting hole comprises a first hole section and a second hole section which are coaxially connected, the first hole section is farther away from the head housing than the second hole section, the inner diameter of the first hole section is smaller than the inner diameter of the second hole section, and a first step surface is formed between the first hole section and the second hole section; The plug is matched with the first hole segment and is partially located in the second hole segment, wherein the portion of the plug located in the second hole segment has a first protrusion extending in the radial direction, and one end surface of the first protrusion is in contact with the first step surface; The dental handpiece further comprises a first sleeve, the first sleeve is fitted in the second hole section, and the first sleeve is abutted between the other end surface of the first protrusion and the motor housing; The inner hole of the first sleeve includes a coaxially connected matching hole section and a receiving hole section, the matching hole section is away from the head housing relative to the receiving hole section, the inner diameter of the matching hole section is larger than the inner diameter of the receiving hole section, a second step surface is formed between the matching hole section and the receiving hole section, the first protrusion is matched with the matching hole section, the plug part is received in the receiving hole section, and the second step surface is in contact with the other end surface of the first protrusion; The dental handpiece further comprises a second sleeve and a bearing, wherein the second sleeve is fitted in the body shell, the bearing is fitted in the second sleeve, and the output shaft is passed through the second sleeve and the bearing, wherein an area on the outer peripheral wall of the second sleeve away from the handpiece shell has a second protrusion protruding in the radial direction, an end surface of the second protrusion is in contact with the first limiting surface, and an end surface of the second sleeve away from the handpiece shell is in contact with the motor shell; The inner peripheral wall of the second sleeve is provided with a circumferentially surrounding groove, the groove is away from the head housing relative to the bearing, and a sealing ring is provided between the groove and the output shaft; The inner circumferential wall of the second sleeve is provided with a first circumferentially surrounding curved portion, the first circumferentially surrounding curved portion is away from the head housing relative to the bearing, the outer circumferential wall of the output shaft is provided with a circumferentially surrounding second circumferentially surrounding portion, the first circumferentially surrounding portion and the second circumferentially surrounding portion are matched to form a labyrinth-type dynamic seal fit together.

2. The dental handpiece according to claim 1, characterized in that: A first bevel gear is circumferentially arranged on the periphery of the clamping member, and a second bevel gear is circumferentially arranged on the periphery of the end of the output shaft of the driving motor, and the first bevel gear is meshed with the second bevel gear.

3. The dental handpiece according to claim 1, characterized in that: The first bending portion includes a first inner ring, a first connecting ring and a first outer ring, the first outer ring is matched with the inner hole of the second sleeve and is arranged outside the first inner ring, the first connecting ring is connected between one end of the first inner ring and one end of the first outer ring, and the first inner ring, the first connecting ring and the first outer ring jointly form a first matching groove; The second bending portion includes a second inner ring, a second connecting ring and a second outer ring, the second inner ring is matched with the output shaft, the second outer ring is arranged outside the second inner ring, the second connecting ring is connected between one end of the second inner ring and one end of the second outer ring, and the second inner ring, the second connecting ring and the second outer ring jointly form a second matching groove; The openings of the first mating groove and the second mating groove face opposite to each other, the first inner ring can be movably inserted into the second mating groove, and the second outer ring can be movably inserted into the first mating groove.

4. A dental treatment device, characterized in that: include: The dental handpiece according to any one of claims 1 to 3; An operating handle is connected to the other end of the fuselage shell.

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