Drive device and dental handpiece

Abstract

This invention discloses a driving device and a dental handpiece. The driving device includes a housing, a drive motor, and a torque compensation device. Both the drive motor and the torque compensation device are installed within the housing. The torque compensation device is used to compensate for the torque of the drive motor. The torque compensation device includes a sensing component and a sensing circuit board corresponding to the sensing component. The drive motor includes a stator module, a magnetic base, and a rotor module. A fixing module is provided within the housing, and the fixing module includes a first fixing member and a second fixing member arranged sequentially along the direction close to the rotor module. Based on the use of a housing, a drive motor, and a torque compensation device, this invention can achieve torque compensation for the drive motor and facilitates the installation of the sensing circuit board and sensing component, ensuring accurate alignment of the sensing circuit board and sensing component.

Description

Technical Field

[0001] This invention relates to the field of power device technology, specifically to drive devices and dental handpieces. Background Technology

[0002] As a core power component, the drive unit's performance directly affects the operational stability, control accuracy, and lifespan of dental handpieces. However, existing drive units generally lack torque compensation for the drive motor, which can easily affect the performance and accuracy.

[0003] With technological advancements, although drive devices that can solve the aforementioned problems have emerged on the market, these drive devices suffer from issues such as unreasonable layout, inconvenient installation, and alignment deviations affecting performance, thus increasing manufacturing costs and difficulties. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a driving device that can realize torque compensation of the drive motor, facilitate the installation of the sensing circuit board and sensing components, and ensure accurate alignment of the sensing circuit board and sensing components.

[0005] Another objective of this invention is to provide a dental handpiece that can compensate for the torque of the drive motor while facilitating the installation of the sensing circuit board and sensing components, and ensuring accurate alignment of the sensing circuit board and sensing components.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A drive unit includes a housing, a drive motor, and a torque compensation device; both the drive motor and the torque compensation device are installed inside the housing; the torque compensation device is used to compensate the torque of the drive motor; the torque compensation device includes a sensing component and a sensing circuit board corresponding to the sensing component; the drive motor includes a stator module, a magnetic base, and a rotor module; a fixing module is provided inside the housing, the fixing module including a first fixing member and a second fixing member arranged sequentially along the direction close to the rotor module; the sensing circuit board is sandwiched between the first fixing member and the second fixing member; the stator module is fixed inside the housing, and the stator module has a central cavity; the rotor module passes through the central cavity of the stator module; the magnetic base is fitted onto the rotor module and is provided with an embedding groove; the sensing component is disposed in the embedding groove of the magnetic base.

[0008] The fixing module also includes a third fixing component; the first fixing component, the second fixing component, and the third fixing component are arranged sequentially in the housing along the direction close to the rotor module, the third fixing component is provided with a mounting groove, and the end of the magnetic base close to the induction circuit board passes through the mounting groove.

[0009] The end of the three fixed components away from the rotor module is provided with an embedded protrusion, and the second fixed component is provided with a proximity positioning groove, and the embedded protrusion is embedded in the proximity positioning groove.

[0010] The sensing circuit board is provided with a remote positioning groove, and the embedded protrusion is embedded in the remote positioning groove.

[0011] The first fixing member includes a first annular body and a first pressing protrusion. The first pressing protrusion is disposed on the first annular body and presses against the embedded protrusion.

[0012] The first fixing member further includes a second pressing protrusion and a third pressing protrusion; the second pressing protrusion, the first pressing protrusion, and the third pressing protrusion are arranged circumferentially around the central axis of the first annulus; the second pressing protrusion and the third pressing protrusion are used to press against the sensing circuit board.

[0013] The magnetic base includes a first cylinder, a second cylinder, and a convex ring; the convex ring is disposed between the first cylinder and the second cylinder; the first cylinder and the convex ring form the embedding groove; the second cylinder is provided with an insertion slot for inserting a rotor module; the insertion slot communicates with the embedding groove.

[0014] The magnet base is provided with a clearance surface, and the extension trajectory of the clearance surface is circular. From the end of the clearance surface near the rotor module to the end away from the rotor module, the clearance surface gradually tilts away from the central axis of the magnet base.

[0015] The clearance surface extends from the convex ring to the first cylinder.

[0016] The housing also includes a support base, which is positioned between the stator module and the fixed module; the support base has a conical cavity; and the magnetic base is housed within the conical cavity.

[0017] A dental handpiece comprising any of the above-mentioned driving devices.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The drive device provided by this invention, based on a housing, a drive motor, and a torque compensation device, can achieve torque compensation of the drive motor. At the same time, through the cooperation between the first fixing component, the second fixing component, and the sensing circuit board, and through the cooperation between the rotor module, the magnetic base, and the sensing component, it facilitates the installation of the sensing circuit board and the sensing component, ensuring accurate alignment of the sensing circuit board and the sensing component. Moreover, the structure is compact, the layout is reasonable, and the alignment is accurate, which significantly improves the convenience, efficiency, and consistency of assembly, reduces production and maintenance costs, and is conducive to promotion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the drive device of the present invention;

[0021] Figure 2 This is a cross-sectional view of the driving device of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A;

[0023] Figure 4 This is a schematic diagram showing the fit of the fixed modules;

[0024] Among them, 10 is the outer shell; 20 is the drive motor; 21 is the stator module; 23 is the rotor module; 30 is the torque compensation device; 31 is the sensing component; 32 is the sensing circuit board; 33 is the remote positioning groove; 40 is the fixing module; 51 is the first fixing member; 52 is the first ring; 53 is the first pressing protrusion; 54 is the second pressing protrusion; 55 is the third pressing protrusion; 60 is the second fixing member; 61 is the proximity positioning groove; 70 is the third fixing member; 71 is the mounting groove; 72 is the embedding protrusion; 80 is the support seat; 81 is the conical cavity; 90 is the magnetic seat; 91 is the first cylinder; 92 is the second cylinder; 93 is the convex ring; 94 is the embedding groove; 95 is the insertion groove; 96 is the clearance surface; and 97 is the conducting unit. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] like Figure 1-4 As shown, the drive device includes a housing 10, a drive motor 20, and a torque compensation device 30. Both the drive motor 20 and the torque compensation device 30 are installed inside the housing 10. The torque compensation device 30 is used to sense the torque changes of the drive motor 20 in real time and to compensate for the torque of the drive motor 20. It includes a sensing component 31 and a sensing circuit board 32 corresponding to the sensing component 31.

[0027] The drive motor 20 includes a stator module 21, a magnetic base 90, and a rotor module 23. The stator module 21 is fixed inside the housing 10 and has a central cavity. The rotor module 23 passes through the central cavity of the stator module 21. The magnetic base 90 is fixedly fitted onto the rotor module 23 and is provided with an embedding groove 94, in which the sensing component 31 is disposed.

[0028] The housing 10 also includes a fixing module 40. The fixing module 40 includes a first fixing member 51 and a second fixing member 60 arranged sequentially along the direction close to the rotor module 23. The sensing circuit board 32 is securely clamped between the first fixing member 51 and the second fixing member 60, thereby achieving reliable positioning and avoiding vibration interference.

[0029] During use, as the rotor module 23 rotates, the sensing component 31, along with the magnetic base 90, rotates with the rotor module 23, causing a change in the magnetic field environment of the sensing component 31 within the embedding slot 94. By sensing the sensing component 31 through the sensing circuit board 32, the position and rotation angle of the rotor module 23 can be detected, thereby sensing changes in the load torque of the drive motor 20. The torque compensation device 30 then adjusts the drive current to achieve rapid compensation, ensuring stable torque output of the drive motor 20. The sensing component 31 can be a sensing magnet, or any other commercially available sensing component. The sensing circuit board 32 can be any sensing circuit board corresponding to and capable of sensing the sensing component 31, such as a circuit board with an encoder.

[0030] The drive device provided by the present invention, based on the use of a housing 10, a drive motor 20, and a torque compensation device 30, and with the torque compensation device 30 consisting of a sensing component 31 and a sensing circuit board 32, can achieve torque compensation of the drive motor 20. In conjunction with the first fixing component 51, the second fixing component 60, and the magnetic base 90, during installation, the magnetic base 90 can be fitted onto the rotor module 23, and the sensing component 31 can be embedded in the embedding groove 94 of the magnetic base 90, thereby achieving accurate alignment of the sensing component 31 and simplifying the installation alignment operation. Furthermore, by facilitating the clamping of the sensing circuit board 32 between the first fixing component 51 and the second fixing component 60 within the housing 10, the installation of the sensing circuit board 32 and the sensing component 31 can be facilitated, ensuring accurate alignment and stable fixation of the sensing circuit board 32 and the sensing component 31.

[0031] As a further improvement of the present invention, the fixing module 40 further includes a third fixing member 70. The first fixing member 51, the second fixing member 60, and the third fixing member 70 are arranged sequentially along the direction close to the rotor module 23. The third fixing member 70 is provided with a mounting groove 71, and the end of the magnetic base 90 near the induction circuit board 32 passes through the mounting groove 71.

[0032] As a further improvement of the present invention, the third fixing member 70 is provided with an embedding protrusion 72 at one end away from the rotor module 23, and the second fixing member 60 is provided with a proximity positioning groove 61. During the installation process, the embedding protrusion 72 is embedded in the proximity positioning groove 61, thereby realizing the alignment and pre-fixation between the second fixing member 60 and the third fixing member 70.

[0033] As a further improvement of the present invention, a remote positioning groove 33 is correspondingly provided on the sensing circuit board 32, and the embedding protrusion 72 of the third fixing member 70 is also embedded in the remote positioning groove 33. During the installation process, the first fixing member 51, the sensing circuit board 32, the second fixing member 60, and the third fixing member 70 can be arranged in sequence, and the embedding protrusion 72 of the third fixing member 70 can be embedded in the proximal positioning groove 61 of the second fixing member 60 and the remote positioning groove 33 of the sensing circuit board 32. This allows the sensing circuit board 32 to achieve precise positioning by directly cooperating with the third fixing member 70, improving the accuracy of the installation alignment of the sensing circuit board 32. Furthermore, the sensing component 31 is embedded in the embedding groove 94 of the magnetic base 90, with one end of the magnetic base 90 near the sensing circuit board 32 passing through the mounting groove 71. A corresponding mating position relationship is established between the sensing circuit board 32 and the sensing component 31 through the third fixing member 70 and the magnetic base 90, ensuring the relative positional accuracy between the sensing component 31 and the sensing circuit board 32, which is beneficial to improving the accuracy of the torque detection signal.

[0034] As a further improvement of the present invention, the first fixing member 51 includes a first annular body 52 and a first pressing protrusion 53 disposed thereon, the first pressing protrusion 53 pressing against the embedded protrusion 72. The first fixing member 51 also includes a second pressing protrusion 54 and a third pressing protrusion 55. The second pressing protrusion 54, the first pressing protrusion 53, and the third pressing protrusion 55 are arranged circumferentially around the central axis of the first annular body 52. ​​The second pressing protrusion 54 and the third pressing protrusion 55 press against the sensing circuit board 32. During assembly, the first fixing component 51, the sensing circuit board 32, the second fixing component 60, and the third fixing component 70 are arranged in sequence, and the embedding protrusion 72 of the third fixing component 70 is embedded in the proximal positioning groove 61 of the second fixing component 60 and the distal positioning groove 33 of the sensing circuit board 32. The first pressing protrusion 53 presses against the embedding protrusion 72 of the third fixing component 70, and the second pressing protrusion 54 and the third pressing protrusion 55 press directly against the surface of the sensing circuit board 32 to ensure that the sensing circuit board 32 is stably and evenly clamped and to prevent it from warping or shifting.

[0035] The third fixing component 70 includes a circular plate and a second annular body; the central axis of the second annular body coincides with the central axis of the circular plate, and the second annular body is disposed on one end of the circular plate near the rotor module 23. The embedded protrusion 72 is disposed on one end of the circular plate away from the rotor module 23. The circular plate and the second annular body form the mounting groove 71. By adopting the above structure, the formation of the mounting groove 71 can be facilitated, and the manufacture of the third fixing component 70 can be facilitated.

[0036] As a further improvement of the present invention, the magnetic base 90 includes a first cylinder 91, a second cylinder 92, and a convex ring 93 located between the two. The convex ring 93 and the first cylinder 91 together form the mounting groove 94. The second cylinder 92 is provided with an insertion slot 95 for inserting the rotor module 23, and the insertion slot 95 is connected to the mounting groove 94. By reasonably setting the structure of the magnetic base 90, the positioning between the sensing component 31 and the rotor module 23 can be easily achieved through the magnetic base 90, and the manufacturing of the magnetic base 90 is also convenient.

[0037] As a further improvement of the present invention, the magnetic base 90 is also provided with a clearance surface 96, the extension trajectory of which is annular. From the end of the clearance surface 96 near the rotor module 23 to the end away from the rotor module 23, the clearance surface 96 gradually slopes away from the central axis of the magnetic base 90. The clearance surface 96 extends from the convex ring 93 of the magnetic base 90 to the first cylinder 91. By using the clearance surface 96 in addition to the embedding groove 94 and the insertion groove 95 of the magnetic base 90, the structure can be made more compact and space-saving.

[0038] As a further improvement of the present invention, a support base 80 is also provided inside the outer casing 10, which is located between the stator module 21 and the fixed module 40. A conical cavity 81 is provided on the support base 80, and the magnetic base 90 is accommodated within the conical cavity 81. This structure facilitates the provision of accommodating space for the magnetic base 90 and improves stability during high-speed operation. The drive device also includes a conduction unit 97; the conduction unit 97 is sequentially disposed on the stator module 21, the support base 80, the fixed module 40, and the sensing circuit board 32. The conduction unit 97 includes a first conduction component and a second conduction component, which are sleeved together. The first conduction component passes through the stator module 21, the support base 80, the third fixed component 70, and the second fixed component 60, while the second conduction component passes through the sensing circuit board 32 and the first fixed component 51.

[0039] A dental handpiece, including any of the dental handpieces mentioned above.

[0040] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. Drive device, characterized in that: The device includes a housing (10), a drive motor (20), and a torque compensation device (30); both the drive motor (20) and the torque compensation device (30) are installed inside the housing (10); the torque compensation device (30) is used to compensate the torque of the drive motor (20); the torque compensation device (30) includes a sensing component (31) and a sensing circuit board (32) corresponding to the sensing component (31); the drive motor (20) includes a stator module (21), a magnetic base (90), and a rotor module (23); a fixing module (40) is provided inside the housing (10), the fixing module (40) includes... The device includes a first fixing member (51) and a second fixing member (60) arranged sequentially along the direction close to the rotor module (23); the sensing circuit board (32) is sandwiched between the first fixing member (51) and the second fixing member (60); the stator module (21) is fixed inside the outer shell (10) and the stator module (21) has a central cavity; the rotor module (23) passes through the central cavity of the stator module (21); the magnetic base (90) is fitted on the rotor module (23) and is provided with an embedding groove (94); the sensing component (31) is disposed in the embedding groove (94) of the magnetic base (90).

2. The drive apparatus according to claim 1, characterized by: The fixing module (40) further includes a third fixing component (70); the first fixing component (51), the second fixing component (60), and the third fixing component (70) are arranged sequentially in the housing (10) along the direction close to the rotor module (23). The third fixing component (70) is provided with a mounting groove (72), and the end of the magnetic base (90) close to the induction circuit board (32) passes through the mounting groove (72).

3. The drive apparatus according to claim 2, characterized by: The third fixing member (70) has an embedded protrusion (72) at one end away from the rotor module (23), and the second fixing member (60) has a proximity positioning groove (61), and the embedded protrusion (72) is embedded in the proximity positioning groove (61).

4. The drive apparatus according to claim 3, characterized by: The sensing circuit board (32) is provided with a remote positioning groove (33), and the embedded protrusion (72) is embedded in the remote positioning groove (33).

5. The drive apparatus according to claim 4, characterized by: The first fixing member (51) includes a first annular body (52) and a first pressing protrusion (53). The first pressing protrusion (53) is disposed on the first annular body (52) and presses against the embedded protrusion (72).

6. The drive apparatus according to claim 5, characterized by: The first fixing member (51) further includes a second pressing protrusion (54) and a third pressing protrusion (55); the second pressing protrusion (54), the first pressing protrusion (53), and the third pressing protrusion (55) are arranged in a circle around the central axis of the first annular body (52); the second pressing protrusion (54) and the third pressing protrusion (55) are used to press against the sensing circuit board (32).

7. The drive apparatus according to claim 1, wherein: The magnetic base (90) includes a first cylinder (91), a second cylinder (92), and a convex ring (93); the convex ring (93) is disposed between the first cylinder (91) and the second cylinder (92); the first cylinder (91) and the convex ring (93) form the embedding groove (94); the second cylinder (92) is provided with an insertion groove (95) for inserting the rotor module (23); the insertion groove (95) communicates with the embedding groove (94).

8. The drive apparatus according to claim 7, characterized by: The magnetic base (90) is provided with a clearance surface (96), and the extension trajectory of the clearance surface (96) is circular. From the end of the clearance surface (96) close to the rotor module (23) to the end away from the rotor module (23), the clearance surface (96) gradually tilts away from the central axis of the magnetic base (90). The clearance surface (96) extends from the convex ring (93) to the first cylinder (91).

9. The drive apparatus according to claim 1, wherein: The outer casing (10) is also provided with a support base (80), which is located between the stator module (21) and the fixed module (40); a conical cavity (81) is provided on the support base (80); and the magnetic base (90) is housed in the conical cavity (81).

10. A dental handpiece characterised by: Includes the drive device as described in any one of claims 1-9.

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