CN216724774U - Dental handpiece and dental therapeutic apparatus - Google Patents

Abstract

The embodiment of the utility model provides a dental handpiece and a dental therapeutic apparatus, and relates to the technical field of oral medical instruments. The driving motor is arranged in the machine body shell, and an output shaft of the driving motor extends into the machine head shell. The clamping piece is used for clamping a working tip, is arranged in the handpiece shell and is in transmission connection with an output shaft of the driving motor in an included angle mode so as to rotate under the driving of the driving motor. The middle transmission is omitted, the number of parts is reduced, the production flow is short, the assembly requirement is low, and meanwhile, the overall size of the dental handpiece can be reduced, so that the dental handpiece meets the design requirements of green engineering and light weight.

Description

Dental handpiece and dental therapeutic apparatus

Technical Field

The utility model relates to the technical field of oral medical instruments, in particular to a dental handpiece and a dental therapeutic apparatus.

Background

Root canal therapy, also known as endodontic therapy, is an operation in dentistry to treat pulp necrosis and root infection. Root canal therapy is mainly directed to the interior of teeth, and is the most effective treatment method for treating acute pulpitis. The condition of the tooth is prevented from further worsening by removing necrotic tissue from within the pulp chamber and then refilling the pulp chamber after sterilization to relieve the pressure stimulation of the diseased tissue on the dental nerve. When the root canal therapy is carried out, in order to reduce the treatment time and relieve the treatment pain of a patient, the dental handpiece is usually used for assisting the treatment.

The existing dental handpiece mainly adopts a driving motor as a driving source and utilizes a gear and a transmission shaft for transmission, so that the number of parts is as large as 25 or more, the structure is complex, the whole quality is heavier, the production flow is long, the cost is high, the assembly requirement is high, the carbon emission is difficult to reduce, and the total cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a dental handpiece and a dental therapeutic apparatus, which omit intermediate transmission, reduce the number of parts, have short production flow and low assembly requirement, and simultaneously reduce the overall size of the dental handpiece, thereby meeting the design requirements of green engineering and light weight.

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

the aircraft comprises a fuselage shell and a handpiece shell connected to one end of the fuselage shell, wherein the inner cavity of the fuselage shell is communicated with the inner cavity of the handpiece shell;

the driving motor is arranged in the machine body shell, and an output shaft of the driving motor extends into the machine head shell;

the clamping piece is used for clamping a working tip, is arranged in the machine head shell and is in transmission connection with an output shaft of the driving motor in an included angle mode, so that the driving motor is driven to rotate.

In an alternative embodiment, the periphery of the clamping piece is provided with a first bevel gear which surrounds circumferentially, the periphery of the end part of the output shaft of the driving motor is provided with a second bevel gear which surrounds circumferentially, and the first bevel gear is meshed with the second bevel gear.

In an optional implementation manner, a first limiting surface which forms an included angle with the axial direction of the machine body is arranged in the machine body shell, and one end, extending out of the output shaft, of a motor shell of the driving motor is attached to the first limiting surface;

the dental handpiece still includes retaining member and plug, retaining member detachably cooperate in the other end of fuselage casing, and support hold in the motor casing is kept away from the one end of holder, wherein, the retaining member has the mounting hole that runs through, the plug cooperate in the mounting hole, and with driving motor electricity is connected.

In an alternative embodiment, the mounting hole comprises a first hole section and a second hole section which are coaxially communicated, the first hole section is far away from the handpiece shell relative to the second hole section, the inner diameter of the first hole section is smaller than that 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 section and is partially positioned in the second hole section, wherein the part of the plug positioned in the second hole section is provided with a first bulge extending along the radial direction, and one end surface of the first bulge is attached to the first step surface;

the dental handpiece also comprises a first shaft sleeve, wherein the first shaft sleeve is matched in the second hole section, and the first shaft sleeve is abutted between the other end face of the first bulge and the motor shell.

In an optional embodiment, the inner hole of the first shaft sleeve includes a matching hole section and an accommodating hole section which are coaxially communicated, the matching hole section is far away from the handpiece shell relative to the accommodating hole section, the inner diameter of the matching hole section is larger than that of the accommodating hole section, the second step surface is formed between the matching hole section and the accommodating hole section, the first protruding portion is matched with the matching hole section, the plug portion is accommodated in the accommodating hole section, and the second step surface is attached to the other end surface of the first protruding portion.

In an optional embodiment, the dental handpiece further includes a second shaft sleeve and a bearing, the second shaft sleeve is fitted in the handpiece housing, the bearing is fitted in the second shaft sleeve, and the output shaft is inserted in the second shaft sleeve and the bearing, wherein a region of the outer peripheral wall of the second shaft sleeve, which is far away from the handpiece housing, is provided with a second protruding portion protruding in the radial direction, one end face of the second protruding portion is attached to the first limiting face, and an end face of the second shaft sleeve, which is far away from one end of the handpiece housing, is attached to the motor housing.

In an alternative embodiment, the inner peripheral wall of the second shaft sleeve is provided with a circumferentially surrounding groove, the groove is far away from the handpiece shell relative to the bearing, and a sealing ring is arranged between the groove and the output shaft.

In an optional implementation mode, the inner peripheral wall of the second shaft sleeve is provided with a first zigzag portion which is circumferentially surrounded, the first zigzag portion is far away from the handpiece shell relative to the bearing, the outer peripheral wall of the output shaft is provided with a second zigzag portion which is circumferentially surrounded, and the first zigzag portion and the second zigzag portion are matched to form a labyrinth type dynamic seal fit together.

In an alternative embodiment, the first zigzag portion includes a first inner ring, a first connecting ring and a first outer ring, the first outer ring is fitted in the inner hole of the second sleeve and is enclosed 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 together enclose a first fitting groove;

the second zigzag portion comprises 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 in a surrounding mode, 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 form a second matching groove in a surrounding mode;

the opening directions of the first matching groove and the second matching groove are opposite, the first inner ring is movably inserted into the second matching groove, and the second outer ring is movably inserted into the first matching groove.

In a second aspect, the present invention provides a dental treatment apparatus comprising:

the dental handpiece of any one of the preceding embodiments;

and the operating handle is connected to the other end of the machine body shell.

According to the dental handpiece and the dental therapeutic apparatus provided by the embodiment of the utility model, the driving motor is directly arranged in the body shell, the output shaft of the driving motor is directly in transmission connection with the clamping piece, and the output shaft of the driving motor and the clamping piece are arranged in an included angle, so that when the clamping piece clamps the working tips such as a needle and a root canal file, the working tips extend out of the body shell in the direction forming the included angle with the body shell, and the output shaft of the driving motor can drive the clamping piece to drive the working tips such as the needle and the root canal file to rotate when rotating, so that intermediate transmission is omitted, the number of parts is reduced, the production flow is short, the assembly requirement is low, meanwhile, the overall size of the dental handpiece can be reduced, and the design requirements of green engineering and light weight are met. In addition, as the driving motor is moved into the body shell, the space in the operating handle is improved, a larger power supply and more control elements can be borne, and the functional diversity of the dental handpiece is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a dental handpiece in accordance with an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is an enlarged view of section C of FIG. 1;

FIG. 5 is a cross-sectional view of a fuselage shell according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a retaining member according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a first sleeve in accordance with an embodiment of the present invention;

FIG. 8 is a partial cross-sectional view of a dental handpiece according to another embodiment of the present invention;

FIG. 9 is a cross-sectional view of a first flexure according to another embodiment of the present invention;

fig. 10 is a sectional view of a second meandering section of another embodiment of the utility model.

Icon: 10-a handpiece housing; 12-a clamp; 121-clamping a needle elastic sheet; 123-axial core; 14-a first bevel gear; 16-a first shaft core bearing; 18-a second shaft bearing; 30-a fuselage shell; 300-a first limiting surface; 301-connecting the pore section; 303-a main bore section; 305-a via section; 307-a second limit surface; 32-a drive motor; 321-an output shaft; 323-motor case; 325-second bevel gear; 34-a locking member; 341-mounting holes; 3410-a first bore section; 3412-a second bore section; 3414-a first step face; 343-a connecting segment; 345-a mating segment; 347-a third limiting surface; 36-a plug; 361-a first boss; 363-circuitry; 37-a bearing; 38-a first sleeve; 381-a mating bore segment; 383-a receiving hole section; 385 — a second step surface; 39-second shaft sleeve; 390-a second boss; 392-a groove; 52-rear cover; 54-a support; 541-a support part; 56-an elastic member; 58-bearing seat; 70-sealing ring; 80-a first meander; 801-a first inner collar; 803-first connecting ring; 805-a first outer ring; 807-first mating groove; 90-a second bend; 901-a second inner ring; 903 — a second connecting ring; 905-a second outer ring; 907-second mating groove.

Detailed Description

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "attached" are to be construed broadly and can include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other; the bonding may be direct bonding or indirect bonding via an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the utility model are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The embodiment of the utility model provides a dental treatment apparatus, which at least comprises an operating handle and a dental handpiece which are connected, wherein various functional elements are arranged on the operating handle to operate the dental handpiece, referring to fig. 1, the dental handpiece comprises a handpiece shell 30, a handpiece shell 10, a driving motor 32 and a clamping piece 12, the handpiece shell 10 is connected to one end of the handpiece shell 30, the inner cavity of the handpiece shell 30 is communicated with the inner cavity of the handpiece shell 10, and the other end of the handpiece shell 30 is connected with the operating handle. The driving motor 32 is disposed in the body housing 30, and an output shaft 321 of the driving motor 32 extends into the handpiece housing 10. The clamping member 12 is used for clamping a working tip, and the clamping member 12 is disposed in the handpiece housing 10 and is in transmission connection with the output shaft 321 of the driving motor 32 in an angle shape so as to rotate under the driving of the driving motor 32.

From this, through directly setting up driving motor 32 in fuselage casing 30, driving motor 32's output shaft 321 is direct to be connected with the 12 transmission of holder, and driving motor 32's output shaft 321 is the contained angle setting with holder 12, thereby there is the eedle in the holder 12 centre gripping, when the tip such as root canal file, the tip stretches out aircraft nose casing 10 with the direction that is the contained angle with fuselage casing 30, thereby when driving motor 32's output shaft 321 rotates, can order about holder 12 and drive the eedle, the tip such as root canal file rotates, the intermediate drive has been saved, part quantity obtains reducing, the production flow is short, the assembly requirement is low, and simultaneously, the overall dimension of dental handpiece also can reduce, accord with green engineering, lightweight design requirement. In addition, as the driving motor 32 is moved into the body shell 30, the space in the operating handle is increased, a larger power supply and more control elements can be carried, and the functional diversity of the dental handpiece is improved.

The inner chamber of aircraft nose casing 10 and the inner chamber of fuselage casing 30 all are cylindricly, and the inner chamber of aircraft nose casing 10 and the inner chamber of fuselage casing 30 pass through mutually, and holder 12 is coaxial with aircraft nose casing 10, and the axis of holder 12 and the axis of aircraft nose casing 10 all coincide with the axis of predetermineeing promptly to holder 12 can drive the work point and use the axis of predetermineeing as the center pin rotation, and driving motor 32's output shaft 321 then is coaxial with aircraft nose casing 10. The periphery of the clamping member 12 is provided with a first bevel gear 14 which circumferentially surrounds, the periphery of the end part of the output shaft 321 of the driving motor 32 is provided with a second bevel gear 325 which circumferentially surrounds, and the first bevel gear 14 is meshed with the second bevel gear 325, 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.

Further, referring to fig. 1 and 2, both ends of the handpiece housing 10 on the preset axis are open, the clamping member 12 includes a needle clamping elastic sheet 121 and a shaft core 123, the shaft core 123 is substantially in the shape of a hollow circular tube, and the axis of the shaft core 123 coincides with the preset axis. The needle clamping elastic sheet 121 is substantially in a hollow tubular shape, the axis of the needle clamping elastic sheet 121 coincides with the preset axis, the needle clamping elastic sheet 121 penetrates through the shaft core 123 and is fixed relative to the shaft core 123, and the work tip can be inserted into the needle clamping elastic sheet 121 from one end of the handpiece shell 10 or taken out of the needle clamping elastic sheet 121. The first bevel gear 14 is disposed on the outer peripheral wall of the shaft core 123, so that when the output shaft 321 of the driving motor 32 rotates, the shaft core 123 drives the needle clamping elastic sheet 121 to rotate around the preset axis to the east, so that the work tip clamped by the needle clamping elastic sheet 121 rotates around the preset axis. Wherein, first bevel gear 14 can be with axle core 123 integral type be connected, also can be the cover locate outside the axle core 123, and for the fixed split type connection of axle core 123, specific connected mode does not restrict, as long as can guarantee that first bevel gear 14 and axle core 123 are relatively fixed, when first bevel gear 14 rotates around the axis of predetermineeing, can drive axle core 123 also around the axis of predetermineeing and rotate can.

The other end of the handpiece shell 10 is provided with a rear cover 52 assembly, the rear cover 52 assembly comprises a rear cover 52 and a support body 54, the support body 54 is annular and is provided with a through hole, the axis of the through hole extends along a preset axis, and the support body 54 is arranged at the other end of the handpiece shell 10. The rear cover 52 is arranged on one side of the supporting body 54 departing from the clamping piece 12 and is separated from the needle clamping elastic sheet 121, wherein the rear cover 52 can move towards the needle clamping elastic sheet 121 under the action of external force to contact the needle clamping elastic sheet 121 and expand the needle clamping elastic sheet 121, so that the work tip can be taken out of the needle clamping elastic sheet 121 or inserted into the needle clamping elastic sheet 121, and replacement and maintenance of the work tip are achieved.

The rear cover 52 assembly also includes a resilient member 56. The inner peripheral wall of the supporting body 54 has a supporting portion 541 extending radially inward, the supporting portion 541 is annular, and the elastic member 56 abuts between the rear cover 52 and the supporting portion 541, so that when the rear cover 52 moves toward the needle-clamping resilient piece 121 under the action of an external force, the elastic member 56 is compressed, and the rear cover 52 gradually approaches and contacts the needle-clamping resilient piece 121, so that the needle-clamping resilient piece 121 expands, thereby replacing the operating tip. After the work tip is reinserted into the needle clamping elastic sheet 121, the rear cover 52 is released, so that the elastic piece 56 rebounds to apply a pushing force to the rear cover 52, the rear cover 52 moves towards the direction away from the needle clamping elastic sheet 121, and the needle clamping elastic sheet 121 gradually returns to the original tightening state to clamp the work tip. The elastic member 56 may be a tubular element capable of elastically deforming, such as a coil spring, a bellows, etc., and the elastic member 56 surrounds the outer periphery of the needle clamping elastic sheet 121.

Specifically, the rear cover 52 assembly further includes a bearing seat 58, the bearing seat 58 is annular and is disposed between the handpiece housing 10 and the support body 54, an outer circumferential surface of the bearing seat 58 is provided with an external thread, and an inner circumferential surface of the handpiece housing 10 is provided with an internal thread, so that the bearing seat 58 and the handpiece housing 10 are connected by threaded engagement. A part of the outer peripheral surface of the bearing seat 58 is located outside the handpiece housing 10, the inner peripheral surface of the bearing seat 58 is provided with the support portion 541, and the elastic member 56 is abutted between the bearing seat 58 and the rear cover 52. The inner peripheral surface of the support body 54 is also provided with an internal thread, whereby the support body 54 is coupled to the bearing housing 58 by the threaded engagement of the support body 54 with the portion of the bearing housing 58 located outside the handpiece housing 10.

Still be equipped with first axle bearing 16 and second axle bearing 18 in the aircraft nose casing 10, first axle bearing 16 is located the one end of aircraft nose casing 10, second axle bearing 18 is located the other end of aircraft nose casing 10, first axle bearing 16, second axle bearing 37 all is coaxial with the axis of predetermineeing, first axle bearing 16 and second axle bearing 18 are worn to locate by the holder, promptly axle core 123 wears to locate first axle bearing 16 and second axle bearing 18, first bevel gear 14 is located between first axle bearing 16 and second axle bearing 18, with this first axle bearing 16 and second axle bearing 18 play the effect that improves the rotational accuracy of holder 12 and reduce the smooth nature of rotation of holder 12.

Referring to fig. 1, 3 and 4, a first limiting surface 300 forming an included angle with the axial direction of the body housing 30 is disposed in the body housing 30, and one end of the motor housing 323 of the driving motor 32, which extends out of the output shaft 321, is attached to the first limiting surface 300, so as to prevent the driving motor 32 from moving toward the head housing 10. The dental handpiece further includes a locking member 34 and a plug 36, the locking member 34 being detachably fitted into the other end of the body housing 30 and abutting against an end of the motor housing 323 remote from the holder 12 to prevent the drive motor 32 from moving in a direction away from the handpiece housing 10. Thus, by limiting the axial movement of the drive motor 32 to prevent the first and second bevel gears 325 from being engaged too tightly or too loosely, or even disengaged, the stability of the transmission between the drive motor 32 and the clamp member 12 is ensured. The locking member 34 has a through mounting hole 341, the plug 36 fits into the mounting hole 341 and is electrically connected to the driving motor 32, i.e. the plug 36 is electrically connected to the driving motor 32 through a circuit 363, and the portion of the plug 36 located outside the body housing 30 is used for electrically connecting to a power source in the operating handle, so that the power source can supply power to the driving motor 32 to enable the output shaft 321 of the driving motor 32 to rotate.

Retaining member 34 is mainly the ring form, and its periphery wall is equipped with the external screw thread, is equipped with the internal thread in the fuselage casing 30 to through external screw thread and internal screw thread meshing, in order to realize retaining member 34 for the fixed of fuselage casing 30, can support tight driving motor 32's motor casing 323, also can realize sealed between retaining member 34 and the fuselage casing 30 well simultaneously, prevent that aqueous vapor etc. when the dental handpiece work from getting into fuselage casing 30 from the gap between fuselage casing 30 and the retaining member 34 in, lead to driving motor 32 to wet and damage.

More specifically, referring to fig. 5, an inner cavity of the body housing 30 may be divided into a connecting hole section 301, a main hole section 303, and a via hole section 305, which are coaxially communicated in sequence and have a diameter decreasing in sequence, where the connecting hole section 301 is far away from the head housing 10 relative to the main hole section 303, the via hole section 305 is directly communicated with the inner cavity of the head housing 10, the motor casing 323 of the driving motor 32 is located in the main hole section 303, the first limiting surface 300 is formed between the via hole section 305 and the main hole section 303, and the second limiting surface 307 is formed between the connecting hole section 301 and the main hole section 303.

Referring to fig. 1, 3 and 6 in conjunction with fig. 5, the locking member 34 may be divided into a connecting section 343 and a matching section 345 connected coaxially, wherein the outer diameter of the connecting section 343 is greater 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 fitting section 345 is fitted in the main hole section 303, an end face of one end of the fitting section 345, which is far away from the connecting section 343, is fitted with the motor case 323 to limit the axial movement of the driving motor 32, the connecting section 343 is fitted in the connecting hole section 301, and the second limiting face 307 is fitted with the third limiting face 347, so that the locking member 34 is fixed relative to the body housing 30, and the sealing property between the body housing 30 and the locking member 34 is also ensured. Wherein, the periphery wall of connecting hole section 301 is equipped with the internal thread, and the periphery wall of connecting section 343 is equipped with the external screw thread to connecting hole section 301 and connecting hole screw-thread fit.

The mounting hole 341 includes a first hole segment 3410 and a second hole segment 3412 which are coaxially communicated, the first hole segment 3410 is distant from the head housing 10 with respect to the second hole segment 3412, an inner diameter of the first hole segment 3410 is smaller than an inner diameter of the second hole segment 3412, and a first step surface 3414 is formed between the first hole segment 3410 and the second hole segment 3412. The plug 36 fits into the first bore segment 3410 and is partially located within the second bore segment 3412, wherein the portion of the plug 36 located within the second bore segment 3412 has a first protrusion 361 extending in the radial direction, and an end surface of the first protrusion 361 abuts the first step surface 3414. The dental handpiece further includes a first sleeve 38, the first sleeve 38 is fitted in the second hole 3412, and the first sleeve 38 is held between the other end surface of the first protrusion 361 and the motor housing 323, so as to fix the plug 36 and seal between the plug 36 and the locking member 34, and since the locking member 34 and the body housing 30 are also in sealing engagement, moisture cannot enter the motor housing 323 during operation of the dental handpiece or during steam sterilization.

Referring to fig. 7, the inner bore of the first sleeve 38 includes a matching hole section 381 and an accommodating hole section 383 which are coaxially communicated, the matching hole section 381 is far away from the handpiece shell 10 relative to the accommodating hole section 383, the inner diameter of the matching hole section 381 is larger than that of the accommodating hole section 383, a second step surface 385 is formed between the hole of the matching section 345 and the accommodating hole section 383, the first protrusion 361 is matched with the matching hole section 381, the plug 36 is partially accommodated in the accommodating hole section 383, and the second step surface 385 is attached to the other end surface of the first protrusion 361. The first sleeve 38 is in interference fit with the second bore segment 3412, so that the sealing performance is better ensured.

With reference to fig. 1, the dental handpiece further includes a second shaft sleeve 39 and a bearing 37, the second shaft sleeve 39 is disposed in the body housing 30, specifically, the second shaft sleeve 39 is fixed to the through hole section 305 of the body housing 30 in a matching manner, the bearing 37 is disposed in the second shaft sleeve 39, and the output shaft 321 is disposed through the first shaft sleeve 38 and the bearing 37, so as to protect the output shaft 321 and improve the smooth rotation and precision of the output shaft 321, thereby ensuring the rotation precision and smooth rotation of the clamping member 12. The region of the outer peripheral wall of the second shaft sleeve 39, which is far away from the handpiece shell 10, is provided with a second protruding portion 390 protruding in the radial direction, one end face of the second protruding portion 390 is attached to the first limiting face 300, and the end face of one end of the second shaft sleeve 39, which is far away from the handpiece shell 10, is attached to the motor casing 323 so as to limit the axial movement of the driving motor 32.

The second bevel gear 325 may be integrally connected with the output shaft 321, or may be sleeved outside the output shaft 321, and is connected in a split manner fixed with respect to the shaft core 123, and a specific connection manner is not limited, so that it is mainly ensured that the second bevel gear 325 and the shaft core 123 are fixed with respect to each other. For example, the second bevel gear 325 is a separate component that is fitted over the end of the output shaft 321. When the driving motor 32 is fixed in the fuselage housing 30, the bearing 37 is fixed in the second shaft sleeve 39, then the output shaft 321 of the driving motor 32 is inserted into the second shaft sleeve 39 and extends out of the second shaft sleeve 39 and the bearing 37, and then the second bevel gear 325 is sleeved on the end part of the output shaft 321 extending out of the second shaft sleeve 39 and the bearing 37; the combination of the first sleeve 38, the locking member 34 and the plug 36 is then inserted into the body housing 30, and the locking member 34 is twisted so that the external threads on the locking member 34 engage the internal threads in the body housing 30 until the second step surface 385 engages the third step surface. Meanwhile, the fit tightness and the sealing property between the second shaft sleeve 39 and the fuselage housing 30 can be ensured by the fit between the outer peripheral wall of the second shaft sleeve 39 and the inner peripheral wall of the through hole section 305.

With reference to fig. 3, in addition, in order to prevent water vapor from entering the motor casing 323 from the handpiece casing 10 during operation or steam sterilization of the dental handpiece, a circumferentially surrounding groove 392 is formed in the inner peripheral wall of the second bushing 39, the groove 392 is away from the handpiece casing 10 relative to the bearing 37, and a sealing ring 70 is arranged between the groove 392 and the output shaft 321, so that sealing between the second bushing 39 and the output shaft 321 is realized, and the matching sealing between the second bushing 39 and the ghost hole section further improves the sealing performance of the driving motor 32 in the handpiece casing 30, thereby ensuring that water vapor cannot enter the motor casing 323. The number of the seal rings 70 is not limited, and may be one or more than two, such as a ring 70, a Y-ring, and a V-ring.

Of course, the sealing between the second shaft sleeve 39 and the output shaft 321 is not limited to the above-mentioned arrangement of the sealing ring 70, for example, referring to fig. 8, in some embodiments, the inner peripheral wall of the second shaft sleeve 39 is provided with a circumferentially surrounding first bent portion 80, the first bent portion 80 is far away from the handpiece housing 10 relative to the bearing 37, the outer peripheral wall of the output shaft 321 is provided with a circumferentially surrounding second bent portion 90, and the first bent portion 80 and the second bent portion 90 are adapted and filled with oil to form a labyrinth dynamic seal fit together.

Specifically, referring to fig. 8 to 10, the 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 enclose a first matching groove, the opening direction of the first matching groove 807 faces the motor casing 323, the first connecting ring 803 fits the side wall of the groove 392, the first outer ring 805 and the second bushing 39 are in interference fit, that is, the outer circumferential wall 807 of the first outer ring fits the bottom wall of the groove 392, the axial length of the first outer ring 805 may be greater than the axial length of the first inner ring 801, so that the other end of the first outer ring 805 fits the motor casing 323, and the other end of the first inner ring 801 is spaced from the motor casing 323, while ensuring the fixation of the first meandering portion 80 with respect to the motor housing 323 and the second boss 39.

The second meandering portion 90 includes a second inner ring 901 and a second outer ring 905 surrounding the second inner ring 901 coaxially in an interference fit with the output shaft 321, one end of the second inner ring 901 and one end of the second outer ring 905 are connected by a second connection ring 903, and the second inner ring 901 is in an interference fit with the output shaft 321, so that the second meandering portion 90 is fixed with respect to the output shaft 321. The second inner ring 901, the second connection ring 903 and the second outer ring 905 together define a second engagement groove 907, an opening direction of the second engagement groove 907 faces the handpiece housing 10, and the second connection ring 903 is attached to the motor housing 323. The relationship between the axial length of the second inner ring 901 and the axial length of the second inner ring 901 is not limited.

The first inner ring 801 is movably inserted into 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 is movably inserted into the first matching groove 807, and the second connecting ring 903 is located between the first inner ring 801 and the motor casing 323, so that the dynamic sealing matching between the output shaft 321 and the second shaft sleeve 39 is realized.

It should be noted that the opening direction of the first matching groove 807 may also be toward the handpiece housing 10, that is, the first connecting ring 803 is attached to the motor housing 323, the first inner ring 801 is away from the side wall of the groove 392, the opening direction of the corresponding 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 away from the motor housing 323, as long as the opening direction of the first matching groove 807 is opposite to the opening direction of the second matching groove 907, so that the first inner ring 801 can be movably inserted into the second matching groove 907, the second outer ring 905 can be movably inserted into the first matching groove, and when the output shaft 321 drives the second bending portion 90 to rotate, the first bending portion 80 and the second bending portion 90 can rotate relatively, and a dynamic sealing fit is achieved.

To sum up, according to the dental handpiece and the dental treatment apparatus of the embodiment of the present invention, the driving motor 32 is directly disposed in the handpiece housing 30, the output shaft 321 of the driving motor 32 is directly in transmission connection with the holder 12, and the output shaft 321 of the driving motor 32 and the holder 12 are disposed at an included angle, so that when the holder 12 holds a work tip such as a needle, a root canal file, etc., the work tip extends out of the handpiece housing 10 in the direction of the included angle with the handpiece housing 30, so that when the output shaft 321 of the driving motor 32 rotates, the holder 12 can be driven to drive the work tip such as a needle, a root canal file, etc., thereby omitting intermediate transmission, reducing the number of parts, shortening the production flow, lowering the assembly requirement, and simultaneously reducing the overall size of the dental handpiece and meeting the design requirements of green engineering and light weight. In addition, as the driving motor 32 is moved into the body shell 30, the space in the operating handle is increased, a larger power supply and more control elements can be carried, and the functional diversity of the dental handpiece is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A dental handpiece, comprising:

the aircraft comprises a fuselage shell and a handpiece shell connected to one end of the fuselage shell, wherein the inner cavity of the fuselage shell is communicated with the inner cavity of the handpiece shell;

the driving motor is arranged in the machine body shell, and an output shaft of the driving motor extends into the machine head shell;

the clamping piece is used for clamping a working tip, is arranged in the machine head shell and is in transmission connection with an output shaft of the driving motor in an included angle mode, so that the driving motor is driven to rotate.

2. The dental handpiece of claim 1, wherein the holder is provided with a circumferentially surrounding first bevel gear on the periphery thereof, and a circumferentially surrounding second bevel gear on the periphery of the end of the output shaft of the drive motor, the first bevel gear and the second bevel gear being in mesh.

3. The dental handpiece according to claim 1, wherein a first limit surface is provided in the handpiece body housing and forms an included angle with the axial direction of the handpiece body housing, and one end of the motor housing of the driving motor, from which the output shaft extends, is attached to the first limit surface;

the dental handpiece still includes retaining member and plug, retaining member detachably cooperate in the other end of fuselage casing, and support hold in the motor casing is kept away from the one end of holder, wherein, the retaining member has the mounting hole that runs through, the plug cooperate in the mounting hole, and with driving motor electricity is connected.

4. The dental handpiece of claim 3, wherein the mounting bore includes first and second coaxially communicating bore sections, the first bore section being remote from the handpiece housing relative to the second bore section, the first bore section having an inner diameter smaller than an inner diameter of the second bore section, the first and second bore sections forming a first step surface therebetween;

the plug is matched with the first hole section and is partially positioned in the second hole section, wherein the part of the plug positioned in the second hole section is provided with a first bulge extending along the radial direction, and one end surface of the first bulge is attached to the first step surface;

the dental handpiece also comprises a first shaft sleeve, wherein the first shaft sleeve is matched in the second hole section, and the first shaft sleeve is abutted between the other end face of the first bulge and the motor shell.

5. The dental handpiece of claim 4, wherein the inner bore of the first sleeve includes a fitting bore section and a receiving bore section which are coaxially communicated, the fitting bore section is far away from the handpiece housing relative to the receiving bore section, the fitting bore section has an inner diameter larger than that of the receiving bore section, a second step surface is formed between the fitting bore section and the receiving bore section, the first protrusion is fitted to the fitting bore section, the plug portion is received in the receiving bore section, and the second step surface is abutted to the other end surface of the first protrusion.

6. The dental handpiece of claim 3, further comprising a second shaft sleeve and a bearing, wherein the second shaft sleeve is fitted in the body housing, the bearing is fitted in the second shaft sleeve, the output shaft is arranged through the second shaft sleeve and the bearing, wherein a region of the outer peripheral wall of the second shaft sleeve, which is far away from the handpiece housing, is provided with a second bulge portion protruding in the radial direction, one end face of the second bulge portion is attached to the first limiting surface, and the end face of the second shaft sleeve, which is far away from the handpiece housing, is attached to the motor housing.

7. A dental handpiece according to claim 6, wherein the inner peripheral wall of the second sleeve is provided with a circumferentially surrounding groove remote from the handpiece housing relative to the bearing, a sealing ring being provided between the groove and the output shaft.

8. The dental handpiece of claim 6, wherein the inner peripheral wall of the second sleeve is provided with a circumferentially surrounding first labyrinth portion which is remote from the handpiece housing relative to the bearing, and the outer peripheral wall of the output shaft is provided with a circumferentially surrounding second labyrinth portion, the first and second labyrinth portions being adapted to form a labyrinth-type dynamic seal engagement.

9. The dental handpiece of claim 8, wherein the first flexure includes a first inner ring, a first connecting ring, and a first outer ring, the first outer ring being fitted to the inner bore of the second sleeve and being disposed around the first inner ring, the first connecting ring being connected between an end of the first inner ring and an end of the first outer ring, the first inner ring, the first connecting ring, and the first outer ring collectively defining a first mating groove;

the second zigzag portion comprises 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 in a surrounding mode, 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 form a second matching groove in a surrounding mode;

the opening directions of the first matching groove and the second matching groove are opposite, the first inner ring is movably inserted into the second matching groove, and the second outer ring is movably inserted into the first matching groove.

10. A dental treatment apparatus, comprising:

the dental handpiece of any one of claims 1-9;

and the operating handle is connected to the other end of the machine body shell.

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