Dental bent handpiece and root canal preparation machine

Abstract

The utility model belongs to the field of oral medical instruments, and relates to a dental bent handpiece which comprises a shell, a gearbox assembly, a straight annular sleeve and a transmission assembly, the gearbox assembly is arranged at the end of the shell, the transmission assembly is arranged in the shell, and the straight annular sleeve is arranged at the end, close to the gearbox assembly, of the transmission assembly; the gearbox assembly comprises a gearbox and a first transmission shaft, and a butt-joint inclined face is arranged on the side, close to the transmission assembly, of the gearbox. The first transmission shaft is arranged in the gear box; the transmission assembly comprises a shaft sleeve and a second transmission shaft, the shaft sleeve is arranged in the shell, and the second transmission shaft is sleeved with the shaft sleeve. The shaft sleeve is sleeved with the straight-cylinder annular sleeve, parallel face contact is formed between the straight-cylinder annular sleeve and the butt-joint inclined face, and a second preset included angle is formed between the first transmission shaft and the second transmission shaft. The utility model further relates to a root canal preparation machine. According to the technical scheme, the production cost of the dental bent handpiece can be reduced, and the transmission connection stability of each structure is improved.

Description

Technical Field

[0001] This application relates to the field of dental medical equipment technology, and more specifically, to a dental handpiece and root canal preparation machine. Background Technology

[0002] A root canal preparation machine is an electric or pneumatic device used in dental root canal treatment. It primarily uses a nickel-titanium file driven by rotation or reciprocating motion to efficiently remove infected tissue from the root canal, enlarge and shape the root canal. Compared to traditional manual operation, it improves treatment efficiency, reduces the risk of instrument fatigue and breakage, and achieves more precise preparation results. It is suitable for handling complex or curved root canals.

[0003] The curved dental handpiece is an important component of the root canal preparation machine. Its front end is usually set with a certain curvature angle to facilitate access to the posterior tooth area or the narrow space of the curved root canal.

[0004] The transmission mechanism in a conventional dental handpiece is usually connected by screws or glue, which increases the time and cost of assembly and maintenance, as well as the cost of parts. In addition, when the screw threads or glue fail, it can cause instability in the transmission mechanism, which in turn can lead to malfunction of the dental handpiece. Utility Model Content

[0005] The technical problem to be solved by the embodiments of this application is that the existing dental curved handpieces have high production costs and poor transmission connection stability.

[0006] To address the aforementioned technical problems, this application provides a dental handpiece with a curved handle, employing the following technical solution:

[0007] A dental curved handpiece includes a housing, a gearbox assembly, a straight cylindrical annular sleeve, and a transmission assembly. The gearbox assembly is mounted at one end of the housing, the transmission assembly is mounted inside the housing, and the straight cylindrical annular sleeve is mounted on one end of the transmission assembly near the gearbox assembly.

[0008] The gearbox assembly includes a gearbox and a first drive shaft. The gearbox is connected to the end of the housing. The gearbox has a through mounting hole and a mating slope on the side of the gearbox near the transmission assembly. The mating slope forms a first preset angle with the central axis of the gearbox, wherein the first preset angle is an acute angle. The first drive shaft is installed in the mounting hole and is located on the central axis of the gearbox.

[0009] The transmission assembly includes a bushing and a second transmission shaft. The bushing is installed inside the housing, and the second transmission shaft is installed inside the bushing and located on the central axis of the bushing.

[0010] The straight cylindrical annular sleeve is fitted onto the bushing, and the end face of the straight cylindrical annular sleeve abuts against the mating inclined surface in a parallel plane. The first drive shaft is connected to the second drive shaft in a driving connection, and a second preset angle is formed between the first drive shaft and the second drive shaft, wherein the second preset angle is a complementary angle to the first preset angle.

[0011] Furthermore, the housing is provided with a mounting cavity, and the shaft is fitted into the mounting cavity;

[0012] The bushing has an annular protrusion, one end of which abuts against the inner wall of the mounting cavity, and the other end abuts against the straight annular bushing.

[0013] Furthermore, the dental handpiece also includes a first elastic element, which is disposed between the straight annular sleeve and the annular protrusion.

[0014] Furthermore, the gearbox has a first mounting slot and a second mounting slot that communicate with each other, and the first mounting slot and the second mounting slot communicate to form the mounting hole that penetrates the gearbox. The first mounting slot is located at the end of the gearbox away from the transmission component, and the second mounting slot is located at the end of the gearbox close to the transmission component. A second preset angle is formed between the central axis of the first mounting slot and the central axis of the second mounting slot.

[0015] The bottom surface of the second mounting groove is the mating slope, the second drive shaft is at least partially placed in the second mounting groove and is connected to the first drive shaft in a driving connection; the straight cylindrical annular sleeve is at least partially placed in the second mounting groove, and the mating slope and the end face of the straight cylindrical annular sleeve form a parallel surface contact.

[0016] Furthermore, the end face of the gearbox facing the transmission assembly is the mating slope, and the second transmission shaft is at least partially inserted into the mounting hole and is connected to the first transmission shaft in a transmission manner; the mating slope forms a parallel surface contact with the end face of the straight cylindrical annular sleeve.

[0017] Furthermore, the dental handpiece also includes a mechanism assembly, which is installed inside the housing and located at the end of the housing away from the gearbox assembly. The transmission assembly is tractively connected between the mechanism assembly and the gearbox assembly.

[0018] Furthermore, the transmission assembly also includes a first gear, a second gear, and a supporting component;

[0019] The first gear is sleeved on one end of the second drive shaft near the movement assembly, and the first gear is connected to the movement assembly in a transmission manner;

[0020] The second gear is sleeved on one end of the second drive shaft near the gearbox assembly, and the second gear is connected to the first drive shaft in a driving connection.

[0021] The bushing has a guide groove at one end facing the gearbox, and the abutting component is installed in the guide groove. The abutting component is used to push the second gear to move toward the first transmission shaft.

[0022] Furthermore, the supporting component includes a first bearing, a slider, and a second elastic element. The first bearing is sleeved on the second transmission shaft, the slider is fixedly connected to the first bearing and is movably mounted in the guide groove, and the second elastic element is connected between the inner wall of the guide groove and the slider.

[0023] Furthermore, the gearbox assembly also includes a third gear, a motor connector, and a head connector;

[0024] The third gear is sleeved on one end of the first drive shaft near the second drive shaft, and the third gear engages with the second gear.

[0025] The motor connector is sleeved on the end of the first drive shaft that is away from the second drive shaft;

[0026] The head connector is fixedly connected to the side of the gearbox away from the outer casing, and the head connector is sleeved outside the motor connector.

[0027] To address the aforementioned technical problems, this application also provides a root canal preparation machine, which employs the following technical solution:

[0028] A root canal preparation machine includes a dental handpiece as described above and a handle, the dental handpiece being mounted on the handle.

[0029] Compared with the prior art, the embodiments of this application have the following main advantages:

[0030] The dental handpiece provided in this application has a mating inclined surface on the gearbox that abuts against the parallel surface of the straight cylindrical annular sleeve. During assembly, the mating inclined surface pushes the straight cylindrical annular sleeve to move along the central axis of the sleeve, facilitating the fixing of the sleeve within the housing. This reduces the assembly difficulty of the dental handpiece, improves its assembly efficiency, and lowers its production cost. Simultaneously, because the straight cylindrical annular sleeve and the mating inclined surface form a parallel abutment, there is no relative movement between them after assembly, ensuring stable contact between the gearbox and the sleeve. This allows for a stable inclined transmission connection between the first and second drive shafts, reducing the number of fixing parts used in the first and second drive shafts, thus lowering the production cost of the dental handpiece and improving the stability of the transmission connection. Attached Figure Description

[0031] To more clearly illustrate the solution of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a dental handpiece according to an embodiment of this application;

[0033] Figure 2 It is about Figure 1 An enlarged schematic diagram of the structure at point A;

[0034] Figure 3 This is a schematic diagram of the structure of the gearbox assembly according to an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the gearbox structure according to an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the transmission assembly according to an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the structure of a dental handpiece according to another embodiment of this application.

[0038] Figure label:

[0039] 1. Outer shell; 11. Mounting cavity; 2. Gearbox assembly; 21. Gearbox; 211. Mounting hole; 2111. First mounting groove; 2112. Second mounting groove; 212. Mud-joint bevel; 213. Connector; 22. First drive shaft; 23. Third gear; 24. Motor connector; 25. Head connector; 26. Bearing positioning component; 261. Bearing positioning component; 262. Second bearing; 263. Third bearing; 264. Bearing positioning sleeve; 3. Straight cylindrical annular sleeve; 4. Transmission assembly; 41. Bushing; 411. Annular protrusion; 412. Positioning pin; 42. Second drive shaft; 43. First gear; 44. Second gear; 45. Supporting component; 451. First bearing; 452. Slider; 453. Second elastic element; 5. Mechanism assembly; 6. First elastic element. Detailed Implementation

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] Existing dental handpieces typically include a housing, a transmission assembly, and a gearbox. When assembling the gearbox and housing, a clamping wedge is usually provided between the transmission assembly and the gearbox. This clamping wedge has a first end face near the transmission assembly and a second end face near the gearbox. The first end face and the second end face have a certain angle between them so that the clamping wedge abuts against the transmission assembly through the first end face and against the end face of the gearbox through the second end face. This allows the clamping wedge to fix the transmission assembly located inside the housing during the assembly of the gearbox and housing.

[0043] However, due to insufficient space inside the dental handpiece and the small size of the clamping block, it is difficult to machine the first and second end faces with a certain included angle at both ends of the clamping block. In addition, since the second end face is inclined relative to the central axis of the transmission component, during the use of the dental handpiece, shaking and vibration may cause relative displacement between the second end face of the clamping block and the end face of the gearbox. This causes relative displacement of the clamping block along the axis of the transmission component, which in turn loosens the transmission component and affects the transmission connection stability of the dental handpiece. In severe cases, it may cause the dental handpiece transmission to fail.

[0044] In view of the background and technical problems described above, this application provides a dental curved handpiece.

[0045] Embodiment 1 of the dental curved handpiece of this application

[0046] Please see Figure 1 As shown in the figure, this application provides a dental handpiece, including: a housing 1, a gearbox assembly 2, a straight annular sleeve 3, and a transmission assembly 4.

[0047] Please see Figure 1 As shown, in some embodiments, the gearbox assembly 2 is mounted at the end of the housing 1, the transmission assembly 4 is mounted inside the housing 1 and is connected to the gearbox assembly 2 in a driving manner, and the straight cylindrical annular sleeve 3 is mounted on the end of the transmission assembly 4 near the gearbox assembly 2.

[0048] In this embodiment, the dental curved handpiece further includes a mechanism assembly 5, which is used to load a working tip and drive the working tip to rotate for root canal treatment. The mechanism assembly 5 is installed inside the housing 1 and is located at the end of the housing 1 away from the gearbox assembly 2. The transmission assembly 4 is drivingly connected between the mechanism assembly 5 and the gearbox assembly 2. The transmission assembly 4 is used to transmit the power output from the gearbox assembly 2 to the mechanism assembly 5, thereby driving the working tip to rotate.

[0049] Please see Figure 1 , Figure 3 , Figure 4 As shown, in some embodiments, the gearbox assembly 2 includes a gearbox 21 and a first drive shaft 22. The gearbox 21 is connected to the end of the housing 1. In this embodiment, the gearbox 21 is connected to the end of the housing 1 away from the movement assembly 5. The gearbox 21 has a through mounting hole 211, and the gearbox 21 has a mating slope 212 on the side near the transmission assembly 4. The mating slope 212 forms a first preset angle α with the central axis of the gearbox 21. Figure 3As shown; the first drive shaft 22 is installed in the mounting hole 211. In this embodiment, the first preset included angle α is an acute angle, and the first drive shaft 22 is located on the central axis of the gearbox 21.

[0050] Please see Figure 1 , Figure 5 As shown, in some embodiments, the transmission assembly 4 includes a bushing 41 and a second transmission shaft 42. The bushing 41 is installed inside the housing 1, and the second transmission shaft 42 is sleeved inside the bushing 41. In this embodiment, the second transmission shaft 42 is arranged parallel to the central axis of the bushing 41.

[0051] The straight cylindrical annular sleeve 3 is sleeved on the bushing 41. In some embodiments, the straight cylindrical annular sleeve 3 has a first end face and a second end face that are arranged opposite to each other, and the first end face and the second end face are arranged parallel to each other, that is, the angle between the perpendicular lines of the first end face and the second end face is 0°.

[0052] In some embodiments, the first end face of the straight annular sleeve 3 abuts against the inclined mating surface 212, forming a parallel surface contact. This contact between the straight annular sleeve 3 and the inclined mating surface 212 enables the inclined assembly between the gearbox assembly 2 and the transmission assembly 4. A second preset angle β is formed between the central axis of the gearbox 21 and the central axis of the bushing 41. Figure 1 As shown, in this embodiment, the second preset included angle β is an acute angle, and the second preset included angle β is a complementary angle to the first preset included angle α, that is, the sum of the included angles of the first preset included angle and the second preset included angle is 90°. Figure 3 As shown.

[0053] In this embodiment, the parallel contact between the first end face of the straight annular sleeve 3 and the mating inclined surface 212 means that the first end face of the straight annular sleeve 3 is parallel to the mating inclined surface 212, and when the first end face of the straight annular sleeve 3 contacts the mating inclined surface 212, the first end face of the straight annular sleeve 3 is tightly fitted to the mating inclined surface 212.

[0054] In this embodiment, after the gearbox 21 and the transmission assembly 4 are assembled, the first transmission shaft 22 and the second transmission shaft 42 are connected in a transmission manner, and a second preset included angle β is formed between the first transmission shaft 22 and the second transmission shaft 42, such as... Figure 1 As shown.

[0055] The dental curved handpiece provided in this embodiment has a mating inclined surface 212 on the gearbox 21 that abuts against the parallel surface of the straight cylindrical annular sleeve 3. During assembly, the mating inclined surface 212 pushes the straight cylindrical annular sleeve 3 to move along the central axis of the bushing 41, so as to fix the bushing 41 in the outer shell 1. This reduces the assembly difficulty of the dental curved handpiece, improves the assembly efficiency of the dental curved handpiece, and reduces the production cost of the dental curved handpiece. At the same time, since the straight cylindrical annular sleeve 3 and the mating inclined surface 212 form a parallel surface abutment, after the assembly is completed, the mating inclined surface 212 and the straight cylindrical annular sleeve 3 do not move relative to each other, which can realize the abutment stability between the gearbox 21 and the bushing 41, thereby realizing the connection between the first drive shaft 22 and the second drive shaft 42. The stable inclined transmission connection reduces the number of fixed parts used between the first transmission shaft 22 and the second transmission shaft 42, thereby reducing the production cost of the dental handpiece and improving the stability of the transmission connection. In addition, since the gearbox 21 is relatively large, the machining difficulty and cost of setting the mating inclined surface 212 on the gearbox 21 are lower, which also reduces the production cost of the dental handpiece. Since the mating inclined surface 212 and the straight cylindrical annular sleeve 3 are parallel surfaces, the mating inclined surface 212 and the straight cylindrical annular sleeve 3 are directly and stably abutted during the use of the dental handpiece, without relative displacement, which improves the abutment stability of the bushing, thereby improving the assembly stability of the transmission components, and thus improving the structural stability and transmission connection stability of the dental handpiece.

[0056] Please see Figure 1 As shown, in some embodiments, the gearbox 21 further includes a connector 213. The gearbox 21 is provided with a first mating groove, and the outer shell 1 is provided with a second mating groove at the corresponding location. The connector 213 is disposed in the first mating groove. When the gearbox 21 is installed at the end of the outer shell 1, the connector 213 extends out from the first mating groove and engages with the second mating groove, thereby realizing a fixed connection between the gearbox 21 and the outer shell 1. In this embodiment, the connector 213 can be selected from a pin, a connecting post, or a ball.

[0057] In some embodiments, the straight cylindrical annular sleeve 3 can be fixedly connected to the bushing 41 by interference fit or rigid connection. When the gearbox 21 is fixedly connected to the end of the housing 1 by the connector 213, the gearbox 21 uses the abutment surface 212 to support the straight cylindrical annular sleeve 3, thereby fixing the bushing 41 inside the housing 1, thus achieving structural assembly stability of the dental handpiece.

[0058] Please see Figure 1 , Figure 5As shown, in some embodiments, the housing 1 is provided with a mounting cavity 11, and the bushing 41 is installed in the mounting cavity 11. In this embodiment, the bushing 41 has an annular protrusion 411. One end of the annular protrusion 411 abuts against the inner wall of the mounting cavity 11, and the other end abuts against the second end face of the straight cylindrical annular sleeve 3. When the gearbox 21 is fixedly connected to the end of the housing 1 through the connector 213, the gearbox 21 abuts against the straight cylindrical annular sleeve 3 through the mating inclined surface 212, thereby causing the straight cylindrical annular sleeve 3 to push the bushing 41 to move towards the inner wall of the mounting cavity 11, so that the annular protrusion 411 abuts against the second end face of the straight cylindrical annular sleeve 3 and the inner wall of the mounting cavity 11, thus fixing the bushing 41 in the housing 1 and realizing the structural assembly stability of the dental handpiece.

[0059] This embodiment of the application achieves the fixed assembly of the transmission component 4 into the housing 1 without the need for additional fixing parts by the abutting cooperation between the gearbox 21, the straight cylindrical annular sleeve 3, the annular protrusion 411 and the inner wall of the mounting cavity 11. This reduces assembly and maintenance costs while achieving structural assembly stability of the dental handpiece.

[0060] Please see Figure 2 As shown, in this embodiment, the annular protrusion 411 is further provided with a through hole, and a positioning pin 412 is provided in the through hole. The inner wall of the mounting cavity 11 is provided with a positioning hole corresponding to the position of the positioning pin 412. When the annular protrusion 411 abuts against the straight cylindrical annular sleeve 3 and the inner wall of the mounting cavity 11, the positioning pin 412 is at least partially inserted into the positioning hole to achieve the anti-rotation function of the bushing 41.

[0061] Please continue reading. Figure 2 As shown, in this embodiment, the dental handpiece further includes a first elastic element 6, which is disposed between the straight annular sleeve 3 and the annular protrusion 411.

[0062] In this embodiment, the first elastic element 6 can be configured as either a linear spring or a wave spring washer.

[0063] In this embodiment, by setting the first elastic element 6, when the straight cylindrical annular sleeve 3 abuts against the annular protrusion 411, the position of the annular protrusion 411 is finely adjusted by the elastic action of the first elastic element 6, thereby realizing the fine adjustment of the bushing 41 relative to the mounting cavity 11, and further realizing the fine adjustment of the position of the first transmission shaft 22, so as to improve the fit stability between the first transmission shaft 22 and the second transmission shaft 42.

[0064] Please see Figure 1 , Figure 5As shown, in some embodiments, the transmission assembly 4 further includes a first gear 43, a second gear 44, and a supporting member 45.

[0065] The first gear 43 is sleeved on the second drive shaft 42 near the end of the movement assembly 5, and the first gear 43 is connected to the movement assembly 5 in a transmission connection.

[0066] The second gear 44 is sleeved on the second drive shaft 42 near one end of the gearbox assembly 2, and the second gear 44 is connected to the first drive shaft 22 in a transmission connection.

[0067] The bushing 41 has a guide groove at one end facing the gearbox 21, and the abutting member 45 is installed in the guide groove. The abutting member 45 is used to push the second gear 44 to move toward the first transmission shaft 22.

[0068] In this embodiment, the arrangement of the first gear 43 and the second gear 44 enables gear meshing transmission between the mechanism assembly 5, the second transmission shaft 42, and the first transmission shaft 22, thereby improving the stability of power transmission and the reliability of connection. In addition, by providing the abutment member 45, the position of the second gear 44 can be finely adjusted to improve the coordination stability between the second gear 44 and the second transmission shaft 42, thereby improving the stability of power transmission and the reliability of connection.

[0069] In this embodiment, the dental handpiece further includes a first elastic element 6, which is disposed between the straight cylindrical annular sleeve 3 and the annular protrusion 411. The elastic action of the first elastic element 6 can finely adjust the position of the annular protrusion 411, thereby improving the stability of the fit between the first gear 43 and the core assembly 5, and further improving the stability of power transmission and connection reliability.

[0070] Please continue reading. Figure 1 , Figure 5 As shown, in some embodiments, the supporting component 45 includes a first bearing 451, a slider 452 and a second elastic member 453. The first bearing 451 is sleeved on the second transmission shaft 42. The slider 452 is fixedly connected to the first bearing 451 and is movably installed in the guide groove. The second elastic member 453 is connected between the inner wall of the guide groove and the slider 452.

[0071] When the dental handpiece completes the assembly of the housing 1, the transmission assembly 4, and the gearbox assembly 2, the slider 452, under the elastic force of the second elastic element 453, pushes the first bearing 451 to move toward the second gear 44. This keeps the second bearing 262 in contact with the second gear 44 while also pushing the second gear 44 to move along the second transmission shaft 42 toward the first transmission shaft 22. This improves the stability of the fit between the second gear 44 and the first transmission shaft 22, thereby improving the stability of power transmission and the reliability of the connection.

[0072] Please see Figure 1 , Figure 3 , Figure 4 As shown, in this embodiment, the gearbox 21 has a first mounting groove 2111 and a second mounting groove 2112 that are connected, and the first mounting groove 2111 and the second mounting groove 2112 are connected to form the mounting hole 211 that penetrates the gearbox 21.

[0073] In this embodiment, the first mounting groove 2111 is located at the end of the gearbox 21 away from the transmission component 4, and the second mounting groove 2112 is located at the end of the gearbox 21 close to the transmission component 4. A second preset angle β is formed between the central axis of the first mounting groove 2111 and the central axis of the second mounting groove 2112.

[0074] In some embodiments, the bottom surface of the second mounting groove 2112 is the mating slope 212, and the second drive shaft 42 is at least partially placed in the second mounting groove 2112 and is connected to the first drive shaft 22 in a driving connection. In this embodiment, the shape of the second mounting groove 2112 matches the shape of the straight cylindrical annular sleeve 3, the straight cylindrical annular sleeve 3 is at least partially placed in the second mounting groove 2112, and the mating slope 212 forms a parallel surface contact with the end face of the straight cylindrical annular sleeve 3.

[0075] In this embodiment, by setting the second mounting groove 2112, when the straight cylindrical annular sleeve 3 is placed into the second mounting groove 2112, since the shape of the second mounting groove 2112 matches the shape of the straight cylindrical annular sleeve 3, relative wobbling of the straight cylindrical annular sleeve 3 can be prevented, thereby improving the docking stability of the straight cylindrical annular sleeve 3, reducing assembly difficulty, and improving assembly efficiency; at the same time, by setting the bottom of the second mounting groove 2112 as a docking slope 212, when the straight cylindrical annular sleeve 3 is placed into the second mounting groove 2112 and its end face abuts against the docking slope 212 in parallel, the transmission connection stability between the first transmission shaft 22 and the second transmission shaft 42 can be improved.

[0076] Please see Figure 1 , Figure 3As shown, in some embodiments, the gearbox assembly 2 further includes a third gear 23, a motor connector 24, and a head connector 25.

[0077] The third gear 23 is sleeved on one end of the first drive shaft 22 near the second drive shaft 42, and the third gear 23 engages with the second gear 44.

[0078] The motor connector 24 is sleeved on the end of the first drive shaft 22 away from the second drive shaft 42, and the motor connector 24 is used for transmission connection with the output shaft of the drive motor.

[0079] The head connector 25 is fixedly connected to the gearbox 21 on the side away from the outer shell 1, and the head connector 25 is sleeved on the motor connector 24. The head connector 25 is used to fix the handle and protect the motor connector 24. In this embodiment, the head connector 25 is fixedly connected to the end of the gearbox 21 away from the outer shell 1 by means of threaded engagement or glue bonding.

[0080] In this embodiment, the gearbox assembly 2 further includes a bearing positioning component 26, which is installed in the positioning hole. The bearing positioning component 26 includes a bearing positioning element 261, a second bearing 262, and a third bearing 263.

[0081] The bearing positioning component 261 is fixedly installed in the first mounting groove 2111. The bearing positioning component 261 has a through hole in its center for the first drive shaft 22 to pass through. In this embodiment, the bearing positioning component 261 is fixedly installed in the first mounting groove 2111 by interference fit or adhesive bonding.

[0082] The second bearing 262 is rotatably sleeved on the first transmission shaft 22 and is located between the bearing positioning member 261 and the third gear 23; the third bearing 263 is rotatably sleeved on the first transmission shaft 22 and is located between the bearing positioning member 261 and the motor connector 24.

[0083] In this embodiment, the bearing positioning component 26 further includes a bearing positioning sleeve 264, which is connected between the second bearing 262 and the third bearing 263. The outer diameter of the bearing positioning sleeve 264 is smaller than the outer diameter of the bearing positioning component 261. By setting the bearing positioning sleeve 264, the problem of the second bearing 262 and the third bearing 263 dying due to excessive pressing during the assembly process is effectively prevented.

[0084] In this embodiment, a bearing positioning component 26 is provided in the positioning hole to position the first drive shaft 22, thereby improving the coaxiality between the first drive shaft 22 and the gearbox 21 and ensuring that the central axis of the first drive shaft 22 coincides with the central axis of the gearbox 21, thereby improving the transmission stability between the first drive shaft 22 and the second drive shaft 42.

[0085] Embodiment 2 of the dental handpiece of this application

[0086] Please see Figure 6 As shown, the difference between the dental handpiece provided in this embodiment and Embodiment 1 is that the end face of the gearbox 21 facing the transmission assembly 4 is the mating slope 212, the second transmission shaft 42 is at least partially inserted into the mounting hole 211 and is connected to the first transmission shaft 22 in a transmission manner; the mating slope 212 forms a parallel surface contact with the end face of the straight cylindrical annular sleeve 3.

[0087] In this embodiment, the straight cylindrical annular sleeve 3 abuts against the gearbox 21 and the annular protrusion 411.

[0088] In this embodiment, by setting the end face of the gearbox 21 as a mating inclined surface 212, the complexity of the gearbox 21 processing can be further reduced and the processing cost can be reduced. At the same time, by the gearbox 21 and the annular protrusion 411 supporting the straight cylindrical annular sleeve 3, the assembly stability of the straight cylindrical annular sleeve 3 can be ensured.

[0089] Based on the dental curved handpiece described above, embodiments of this application also provide a root canal preparation machine.

[0090] In some embodiments, the root canal preparation machine includes the aforementioned curved dental handpiece and a handle, the curved dental handpiece being mounted on the handle.

[0091] In this embodiment, a motor is provided on the handle, and the dental curved handpiece is fixedly mounted on the handle via a head connector 25. The motor connector 24 is connected to the output end of the motor for transmission.

[0092] During operation, the motor control motor connector 24 rotates, driving the first transmission shaft 22 to rotate. The third gear 23 drives the second gear 44 to rotate, thereby driving the second transmission shaft 42 to rotate. Subsequently, the first gear 43 drives the working tip mounted on the mechanism assembly 5 to rotate, so that medical staff can perform root canal treatment.

[0093] The root canal preparation machine provided in this application embodiment, by adopting the dental curved handpiece as described above, can reduce the complexity of the dental curved handpiece parts processing, reduce the parts processing cost, and reduce the production cost of the dental curved handpiece; at the same time, it can also improve the assembly stability of the dental curved handpiece, reduce the assembly difficulty and maintenance cost of the dental curved handpiece, and improve the assembly efficiency.

[0094] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A dental curved handpiece, characterized in that, The device includes a housing, a gearbox assembly, a straight cylindrical annular sleeve, and a transmission assembly. The gearbox assembly is installed at one end of the housing, the transmission assembly is installed inside the housing, and the straight cylindrical annular sleeve is installed at one end of the transmission assembly near the gearbox assembly. The gearbox assembly includes a gearbox and a first drive shaft. The gearbox is connected to the end of the housing. The gearbox has a through mounting hole and a mating slope on the side of the gearbox near the transmission assembly. The mating slope forms a first preset angle with the central axis of the gearbox, wherein the first preset angle is an acute angle. The first drive shaft is installed in the mounting hole and is located on the central axis of the gearbox. The transmission assembly includes a bushing and a second transmission shaft. The bushing is installed inside the housing, and the second transmission shaft is installed inside the bushing and located on the central axis of the bushing. The straight cylindrical annular sleeve is fitted onto the bushing, and the end face of the straight cylindrical annular sleeve abuts against the mating inclined surface in a parallel plane. The first drive shaft is connected to the second drive shaft in a driving connection, and a second preset angle is formed between the first drive shaft and the second drive shaft, wherein the second preset angle is a complementary angle to the first preset angle.

2. The dental handpiece according to claim 1, characterized in that, The housing has a mounting cavity, and the shaft is fitted into the mounting cavity; The bushing has an annular protrusion, one end of which abuts against the inner wall of the mounting cavity, and the other end abuts against the straight annular bushing.

3. The dental handpiece according to claim 2, characterized in that, The dental handpiece further includes a first elastic element, which is disposed between the straight annular sleeve and the annular protrusion.

4. The dental handpiece according to claim 1, characterized in that, The gearbox has a first mounting slot and a second mounting slot that are connected, and the first mounting slot and the second mounting slot are connected to form a mounting hole that passes through the gearbox. The first mounting slot is located at the end of the gearbox away from the transmission component, and the second mounting slot is located at the end of the gearbox close to the transmission component. A second preset angle is formed between the central axis of the first mounting slot and the central axis of the second mounting slot. The bottom surface of the second mounting groove is the mating slope, the second drive shaft is at least partially placed in the second mounting groove and is connected to the first drive shaft in a driving connection; the straight cylindrical annular sleeve is at least partially placed in the second mounting groove, and the mating slope and the end face of the straight cylindrical annular sleeve form a parallel surface contact.

5. The dental handpiece according to claim 1, characterized in that, The end face of the gearbox facing the transmission assembly is the mating slope. The second transmission shaft is at least partially inserted into the mounting hole and is connected to the first transmission shaft in a transmission manner. The mating slope forms a parallel surface contact with the end face of the straight cylindrical annular sleeve.

6. The dental handpiece according to any one of claims 1 to 5, characterized in that, The dental handpiece also includes a mechanism assembly, which is installed inside the housing and located at the end of the housing away from the gearbox assembly. The transmission assembly is motive-connected between the mechanism assembly and the gearbox assembly.

7. The dental handpiece according to claim 6, characterized in that, The transmission assembly also includes a first gear, a second gear, and a supporting component; The first gear is sleeved on one end of the second drive shaft near the movement assembly, and the first gear is connected to the movement assembly in a transmission manner; The second gear is sleeved on one end of the second drive shaft near the gearbox assembly, and the second gear is connected to the first drive shaft in a driving connection. The bushing has a guide groove at one end facing the gearbox, and the abutting component is installed in the guide groove. The abutting component is used to push the second gear to move toward the first transmission shaft.

8. The dental handpiece according to claim 7, characterized in that, The supporting component includes a first bearing, a slider, and a second elastic element. The first bearing is sleeved on the second transmission shaft. The slider is fixedly connected to the first bearing and is movably mounted in the guide groove. The second elastic element is connected between the inner wall of the guide groove and the slider.

9. The dental handpiece according to claim 7, characterized in that, The gearbox assembly also includes a third gear, a motor connector, and a head connector; The third gear is sleeved on one end of the first drive shaft near the second drive shaft, and the third gear engages with the second gear. The motor connector is sleeved on the end of the first drive shaft that is away from the second drive shaft; The head connector is fixedly connected to the side of the gearbox away from the outer casing, and the head connector is sleeved outside the motor connector.

10. A root canal preparation machine, characterized in that, The device includes a dental handpiece and a handle as described in any one of claims 1 to 9, wherein the dental handpiece is mounted on the handle.

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