Dental handpiece with torque adjustment

Abstract

The utility model discloses a dental handpiece with torque adjusting function, including the head, handle and transmission mechanism, still include torque adjusting mechanism, torque adjusting mechanism sets up in handle far from the one end of head and with transmission mechanism transmission connection, torque adjusting mechanism includes first connecting head, second connecting head, power input shaft, sleeve, first massive piece and second massive piece, first connecting head installs in the first end of sleeve and with handle limit cooperation, second connecting head installs in the second end of sleeve and with sleeve screw cooperation, the first end of power input shaft is connected with the output end of electric motor, first massive piece sets up in the second end of power input shaft, first massive piece and second massive piece limit cooperation, second massive piece with transmission mechanism transmission connection. The utility model discloses a dental handpiece with torque adjusting function, high security, strong applicability, and torque adjusting operation is convenient, convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of dental handpiece technology, and in particular to a dental handpiece with torque adjustment function. Background Technology

[0002] Dental handpieces, also known as oral handpieces, are specialized medical instruments used in dentistry, unlike everyday handpieces. They are used to clean tartar and polish decayed teeth. There are various types of dental handpieces, which can be categorized into high-speed and low-speed handpieces based on their rotation speed and structure. Current high-speed dental handpieces use a turbine-type fan to drive the bur for cutting. However, under resistance, the bur cannot cut, resulting in low efficiency and prolonged operation time for the dentist. This not only increases the dentist's workload but also causes more pain for the patient.

[0003] As shown in the existing patent document with publication number CN208274635U, a high-efficiency dental handpiece is disclosed, including a handpiece head, a handpiece sleeve, a handpiece assembly, a drive shaft assembly, a bend, a housing, and a insertion / removal assembly; the handpiece sleeve is fixedly installed inside the handpiece head, and the handpiece assembly is rotatably installed inside the handpiece sleeve; the handpiece assembly includes a needle housing, a press-type needle shaft, and a bur; the head of the bend is fixedly connected to the handpiece head, and the drive shaft assembly is installed inside the bend, the drive shaft assembly including a drive shaft sleeve and a drive shaft; the head of the housing is fixedly connected to the tail of the bend, and the insertion / removal assembly is installed inside the housing, the insertion / removal assembly including a gear shaft, a gear shaft sleeve, and a shaft-shaped connector.

[0004] The aforementioned dental handpiece uses a mechanical transmission speed-increasing method, and its rotation will not stop due to cutting resistance. It can continuously provide high-speed, high-torque cutting kinetic energy, fully meeting the cutting requirements of dental handpieces required by surgeons, improving surgical efficiency, and reducing patient pain. However, it also has the following drawbacks: Existing mechanically driven speed-increasing dental handpieces generally use electric motors for power input, without a torque adjustment mechanism. The output torque cannot be adjusted. If the dental handpiece requires a small torque, but the motor outputs a large torque, the final output torque of the handpiece head will also be large, which can easily lead to excessive torque. Excessive torque can cause safety accidents, and the safety performance needs to be improved. Utility Model Content

[0005] The purpose of this invention is to provide a dental handpiece with torque adjustment function, which can at least solve some of the problems in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution: A dental handpiece with torque adjustment function includes a head, a handle, and a transmission mechanism, and also includes a torque adjustment mechanism, which is located at the end of the handle away from the head and is connected to the transmission mechanism. The torque adjustment mechanism includes a first connector, a second connector, a power input shaft, a sleeve, a first block, and a second block. The first connector is installed at the first end of the sleeve and is limited by the handle. The second connector is installed at the second end of the sleeve and is threaded into the sleeve. The first end of the power input shaft is connected to the output end of the electric motor. The first block is disposed at the second end of the power input shaft. The first block and the second block are limited by each other. The second block is connected to the transmission mechanism. When the torque of the first block is less than or equal to the torque of the second block, the first block drives the second block to rotate synchronously under the action of the power input shaft. When the torque of the first block is greater than the torque of the second block, the first block cannot drive the second block to rotate.

[0007] In some embodiments, the torque adjustment mechanism further includes a first bearing, a second bearing, an elastic element, and a first assembly. The first block has a first limiting groove, the first bearing is fitted onto the outer periphery of the power input shaft and installed in the first limiting groove, the second connector has a second limiting groove, the second bearing is fitted onto the outer periphery of the power input shaft and installed in the second limiting groove, the first assembly is fitted onto the outer periphery of the power input shaft and its first end abuts against the second bearing, the elastic element is fitted onto the outer periphery of the power input shaft, the first end of the elastic element abuts against the second end of the first assembly, and the second end abuts against the first block, and the first block is pressed against the second block by the action of the elastic element. Therefore, the first and second bearings can ensure the normal rotation of the power input shaft and also act as a limit to prevent axial displacement of the power input shaft. The elastic element can effectively ensure the fit between the first and second blocks. The second connector is threaded with the sleeve, and the elastic force of the elastic element can be adjusted by adjusting the position between the two, thereby adjusting the torque. For example, if a larger torque is needed, the second connector and the sleeve can be brought closer together to compress the elastic element, so that the first block presses the second block more forcefully. Therefore, a larger torque is required to achieve this.

[0008] In some embodiments, a limiting head is formed at the second end of the power input shaft to cooperate with the limiting head of the first bearing. The first bearing is pressed against the limiting head by the elastic element. Thus, the elastic element can press the first block and the first bearing against the power input shaft, thereby effectively ensuring that the first block rotates synchronously with the power input shaft and realizing power input.

[0009] In some embodiments, the torque adjustment mechanism further includes a second component. The second block has a third limiting groove at one end near the power input shaft, which engages with the second component. The second component is fitted onto the outer periphery of the limiting head and located within the third limiting groove. Thus, the second component acts as a bearing, ensuring both free rotation of the power input shaft and limiting its movement.

[0010] In some embodiments, the torque adjustment mechanism further includes a third assembly and a third bearing. The transmission mechanism includes a second shaft-shaped connector. A shaft-shaped portion is formed at the end of the second block away from the first block. The third bearing is mounted on the first connector and fitted around the outer periphery of the shaft-shaped portion. The third assembly is fitted around the outer periphery of the shaft-shaped portion and engages with the second shaft-shaped connector for limiting. The end of the shaft-shaped portion away from the second block can be inserted into the second shaft-shaped connector.

[0011] In some embodiments, the transmission mechanism further includes a linkage shaft, a first gear transmission assembly, a transmission shaft, and a second gear transmission assembly. The machine head includes a machine head housing and a core assembly disposed within the machine head housing. The second shaft-shaped connector, the linkage shaft, and the first gear transmission assembly are installed inside the handle. The transmission shaft and the second gear transmission assembly are installed inside the machine head housing. One end of the linkage shaft is fixedly connected to the second shaft-shaped connector, and the other end is drivenly connected to the first gear transmission assembly. One end of the transmission shaft is drivenly connected to the first gear transmission assembly, and the other end is drivenly connected to the second gear transmission assembly. The second gear transmission assembly is drivenly connected to the core assembly.

[0012] In some implementations, the handle is detachably coupled to the head housing.

[0013] In some implementations, the first connector is provided with a guide post that engages with the handle for positioning.

[0014] In some embodiments, a limiting protrusion is provided on the first block, and a fourth limiting groove is provided on the second block to cooperate with the limiting protrusion. Alternatively, the second block may have a limiting protrusion, and the first block may have a fourth limiting groove that cooperates with the limiting protrusion.

[0015] In some embodiments, the torque adjustment mechanism further includes a first shaft-shaped connector, the first end of which is connected to the first end of the power input shaft, and the second end of which is connected to the output end of the electric motor.

[0016] The beneficial effects of this utility model are: This invention provides a novel dental handpiece with a torque adjustment mechanism added to the end of the handle. Its working principle is as follows: an electric motor drives a power input shaft to rotate, which in turn drives a first block to rotate. Because the first block presses tightly against a second block and they are mutually restrained, the second block rotates synchronously with the first block, thus transmitting power to the dental handpiece's transmission mechanism. When the torque of the first block exceeds the restraining force of the second block, the surface torque is too large, causing the first block to slip relative to the second block and preventing it from rotating, thus providing protection. When the output torque needs adjustment, the second connector and / or sleeve are rotated to allow relative movement between them. The second connector and sleeve move closer together, increasing the torque required to prevent the first block from slipping relative to the second block, resulting in a larger output torque; conversely, the output torque decreases as the two components move closer together.

[0017] Therefore, this dental handpiece has a torque adjustment function, high safety, wide applicability, and convenient torque adjustment operation, making it easy to use. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the dental handpiece with torque adjustment function according to this utility model; Figure 2 for Figure 1 A side view of the dental handpiece structure is shown. Figure 3 for Figure 2 The diagram shows a cross-sectional view of a dental handpiece along the AA direction. Figure 4 This is a three-dimensional structural diagram of the torque adjustment mechanism of this utility model; Figure 5 This is a cross-sectional structural diagram of the torque adjustment mechanism of this utility model; Figure 6 for Figure 4 The exploded structural diagram of the torque adjustment mechanism is shown. Figure 7 This is a three-dimensional structural diagram of the first block component of this utility model; Figure 8 This is a three-dimensional structural diagram of the second block of this utility model; Figure 9 This is a three-dimensional structural diagram of the torque adjustment mechanism of this utility model in conjunction with an electric motor; Figure 10 for Figure 9 The diagram shows a cross-sectional structure.

[0019] Wherein: 100-Dental handpiece; 200-Electric motor; 1-Headpiece; 2-Handle; 3-Transmission mechanism; 4-Torque adjustment mechanism; 101-Headpiece housing; 102-Mechanical assembly; 301-Second shaft connector; 302-Linkage shaft; 303-First gear transmission assembly; 304-Transmission shaft; 305-Second gear transmission assembly; 401-First connector; 402-Second connector; 403-Power input shaft; 404-Sleeve; 405-First block component; 40 6-Second block-shaped component; 407-First bearing; 408-Second bearing; 409-Third bearing; 4010-Elastic component; 4011-First assembly; 4012-Second assembly; 4013-Third assembly; 4014-First shaft-shaped connector; 401a-Guide post; 401b-Second limiting groove; 403a-Limiting head; 405a-First limiting groove; 405b-Fourth limiting groove; 406a-Third limiting groove; 406b-Shaft-shaped part; 406c-Limiting protrusion. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] refer to Figures 1 to 10 The illustration discloses a dental handpiece with torque adjustment function as one embodiment of the present invention.

[0022] Specifically, the dental handpiece 100 with torque adjustment function includes a head 1, a handle 2 and a transmission mechanism 3, and also includes a torque adjustment mechanism 4, which is located at the end of the handle 2 away from the head 1 and is connected to the transmission mechanism 3. The torque adjustment mechanism 4 includes a first connector 401, a second connector 402, a power input shaft 403, a sleeve 404, a first block 405, and a second block 406. The first connector 401 is installed at the first end of the sleeve 404 and is limited to the handle 2. The second connector 402 is installed at the second end of the sleeve 404 and is threaded to the sleeve 404. The first end of the power input shaft 403 is connected to the output end of the electric motor 200. The first block 405 is disposed at the second end of the power input shaft 403. The first block 405 and the second block 406 are limited to each other. The second block 406 is connected to the transmission mechanism 3. When the torque of the first block 405 is less than or equal to the torque of the second block 406, the first block 405 drives the second block 406 to rotate synchronously under the action of the power input shaft 403. When the torque of the first block 405 is greater than the torque of the second block 406, the first block 405 cannot drive the second block 406 to rotate.

[0023] Preferably, the torque adjustment mechanism 4 further includes a first bearing 407, a second bearing 408, an elastic element 4010, and a first assembly 4011. The first block 405 has a first limiting groove 405a. The first bearing 407 is fitted around the outer periphery of the power input shaft 403 and installed in the first limiting groove 405a. The second connector 402 has a second limiting groove 401b. The second bearing 408 is fitted around the outer periphery of the power input shaft 403 and installed in the second limiting groove 401b. The first assembly 4011 is fitted around the outer periphery of the power input shaft 403, with its first end abutting against the second bearing 408. The elastic element 4010 is fitted around the outer periphery of the power input shaft 403. The first end of the elastic element 4010 abuts against the second end of the first assembly 4011, and the second end abuts against the first block 405. The first block 405 is pressed against the second block 406 by the elastic element 4010. Therefore, the first bearing 407 and the second bearing 408 can both ensure the normal rotation of the power input shaft 403 and act as a limit to prevent axial displacement of the power input shaft 403; the elastic element 4010 can effectively ensure the fit between the first block 405 and the second block 406; the second connector 402 is threadedly engaged with the sleeve 404, and the elastic force of the elastic element 4010 can be adjusted by adjusting the position between the two, thereby adjusting the torque. For example, if a larger torque is needed, the second connector 402 and the sleeve 404 can be brought closer together, thereby compressing the elastic element 4010, so that the first block 405 presses the second block 406 with greater force. Therefore, a larger torque is required to achieve this.

[0024] Preferably, the second end of the power input shaft 403 has a limiting head 403a that engages with the first bearing 407. The first bearing 407 is pressed against the limiting head 403a by the elastic member 4010. The diameter of the limiting head 403a is larger than the diameter of the power input shaft 403 body. Therefore, the elastic member 4010 can press the first block 405 and the first bearing 407 against the power input shaft 403, thereby effectively ensuring that the first block 405 rotates synchronously with the power input shaft 403, thus realizing power input.

[0025] Preferably, the torque adjustment mechanism 4 further includes a second component 4012. The second block 406 has a third limiting groove 406a at one end near the power input shaft 403, which engages with the second component 4012. The second component 4012 is fitted onto the outer periphery of the limiting head 403a and located within the third limiting groove 406a. Thus, the second component 4012 acts as a bearing, ensuring both free rotation of the power input shaft 403 and limiting its movement.

[0026] As a further preferred embodiment, the elastic element 4010 in this embodiment is a spring.

[0027] Preferably, the torque adjustment mechanism 4 further includes a third component 4013 and a third bearing 409. The transmission mechanism 3 includes a second shaft-shaped connector 301. The end of the second block 406 away from the first block 405 forms a shaft-shaped portion 406b. The third bearing 409 is mounted on the first connector 401 and fitted around the outer periphery of the shaft-shaped portion 406b. The third component 4013 is fitted around the outer periphery of the shaft-shaped portion 406b and is limited to the second shaft-shaped connector 301. The end of the shaft-shaped portion 406b away from the second block 406 can be inserted into the second shaft-shaped connector 301.

[0028] Preferably, the transmission mechanism 3 further includes a linkage shaft 302, a first gear transmission assembly 303, a transmission shaft 304, and a second gear transmission assembly 305. The head 1 includes a head housing 101 and a core assembly 102 disposed within the head housing 101. The second shaft-shaped connector 301, the linkage shaft 302, and the first gear transmission assembly 303 are installed inside the handle 2. The transmission shaft 304 and the second gear transmission assembly 305 are installed inside the head housing 101. One end of the linkage shaft 302 is fixedly connected to the second shaft-shaped connector 301, and the other end is drivenly connected to the first gear transmission assembly 303. One end of the transmission shaft 304 is drivenly connected to the first gear transmission assembly 303, and the other end is drivenly connected to the second gear transmission assembly 305. The second gear transmission assembly 305 is drivenly connected to the core assembly 102.

[0029] Movement assembly 102 is existing technology.

[0030] As a further preferred embodiment, both the first gear transmission assembly 303 and the second gear transmission assembly 305 include at least two meshing gears.

[0031] Preferably, the handle 2 is detachably coupled to the head housing 101.

[0032] Preferably, the first connector 401 is provided with a guide post 401a that cooperates with the handle 2 for positioning.

[0033] Preferably, the first block 405 is provided with a limiting protrusion 406c, and the second block 406 is provided with a fourth limiting groove 405b that cooperates with the limiting protrusion 406c. Alternatively, the second block 406 may be provided with a limiting protrusion 406c, and the first block 405 may be provided with a fourth limiting groove 405b that cooperates with the limiting protrusion 406c for limiting.

[0034] This embodiment uses the example of a limiting protrusion 406c on the second block 406 and a fourth limiting groove 405b on the first block 405 for illustration.

[0035] As a further preferred embodiment, there are multiple limiting protrusions 406c and fourth limiting grooves 405b, and the number of fourth limiting grooves 405b is twice the number of limiting protrusions 406c.

[0036] Preferably, the torque adjustment mechanism 4 further includes a first shaft connector 4014, the first end of which is connected to the first end of the power input shaft 403, and the second end of which is connected to the output end of the electric motor 200.

[0037] The working principle of the dental handpiece 100 with torque adjustment function of this utility model is as follows: When the electric motor 200 operates, it drives the power input shaft 403 to rotate. The power input shaft 403 drives the first block 405 to rotate. Since the first block 405 presses tightly against the second block 406 and mutually limits each other, the second block 406 rotates synchronously with the first block 405, thereby transmitting power to the transmission mechanism 3 of the dental handpiece 100. When the torque of the first block 405 exceeds the limiting force of the second block 406, the surface torque is too large. At this time, the first block 405 slips relative to the second block 406 and cannot drive the second block 406 to rotate, thus playing a protective role. When it is necessary to adjust the output torque, by rotating the second connector 402 and / or the sleeve 404, the two move relative to each other. The second connector 402 and the sleeve 404 move closer to each other, and the torque required for the first block 405 to slip relative to the second block 406 is greater, and the subsequent output torque is greater. Conversely, the output torque is smaller.

[0038] Therefore, the dental handpiece 100 has a torque adjustment function, high safety, strong applicability, and convenient torque adjustment operation, making it easy to use.

[0039] The above description only discloses some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A dental handpiece with torque adjustment function, comprising a head (1), a handle (2), and a transmission mechanism (3), characterized in that, It also includes a torque adjustment mechanism (4), which is located at the end of the handle (2) away from the machine head (1) and is connected to the transmission mechanism (3) in a transmission connection. The torque adjustment mechanism (4) includes a first connector (401), a second connector (402), a power input shaft (403), a sleeve (404), a first block (405), and a second block (406). The first connector (401) is installed on the first end of the sleeve (404) and is limited to the handle (2). The second connector (402) is installed on the second end of the sleeve (404) and is threaded to the sleeve (404). The first end of the power input shaft (403) is connected to the output end of the electric motor (200). The first block (405) is disposed on the second end of the power input shaft (403). The first block (405) and the second block (406) are limited to each other. The second block (406) is connected to the transmission mechanism (3) in a transmission manner. When the torque of the first block (405) is less than or equal to the torque of the second block (406), under the action of the power input shaft (403), the first block (405) can drive the second block (406) to rotate synchronously. When the torque of the first block (405) is greater than the torque of the second block (406), the first block (405) cannot drive the second block (406) to rotate.

2. The dental handpiece with torque adjustment function according to claim 1, characterized in that, The torque adjustment mechanism (4) further includes a first bearing (407), a second bearing (408), an elastic element (4010), and a first assembly (4011). The first block (405) has a first limiting groove (405a). The first bearing (407) is fitted onto the outer periphery of the power input shaft (403) and installed in the first limiting groove (405a). The second connector (402) has a second limiting groove (401b). The second bearing (408) is fitted onto the outer periphery of the power input shaft (403) and installed in the first limiting groove (401a). Within the second limiting groove (401b), the first kit (4011) is fitted onto the outer periphery of the power input shaft (403) with its first end abutting against the second bearing (408). The elastic member (4010) is fitted onto the outer periphery of the power input shaft (403), with its first end abutting against the second end of the first kit (4011) and its second end abutting against the first block (405). Under the action of the elastic member (4010), the first block (405) is pressed against the second block (406).

3. The dental handpiece with torque adjustment function according to claim 2, characterized in that, The second end of the power input shaft (403) is formed with a limiting head (403a) that is matched with the first bearing (407). The first bearing (407) is pressed against the limiting head (403a) by the elastic member (4010).

4. The dental handpiece with torque adjustment function according to claim 3, characterized in that, The torque adjustment mechanism (4) further includes a second component (4012). The second block (406) has a third limiting groove (406a) at one end near the power input shaft (403) that is matched with the second component (4012). The second component (4012) is fitted around the outer periphery of the limiting head (403a) and is located in the third limiting groove (406a).

5. The dental handpiece with torque adjustment function according to claim 3, characterized in that, The torque adjustment mechanism (4) further includes a third component (4013) and a third bearing (409). The transmission mechanism (3) includes a second shaft-shaped connector (301). The second block (406) has a shaft-shaped portion (406b) formed at one end away from the first block (405). The third bearing (409) is installed on the first connector (401) and fitted around the outer periphery of the shaft-shaped portion (406b). The third component (4013) is fitted around the outer periphery of the shaft-shaped portion (406b) and is limited to the second shaft-shaped connector (301). The end of the shaft-shaped portion (406b) away from the second block (406) can be inserted into the second shaft-shaped connector (301).

6. The dental handpiece with torque adjustment function according to claim 5, characterized in that, The transmission mechanism (3) further includes a linkage shaft (302), a first gear transmission assembly (303), a transmission shaft (304), and a second gear transmission assembly (305). The machine head (1) includes a machine head housing (101) and a core assembly (102) disposed in the machine head housing (101). The second shaft-shaped connector (301), the linkage shaft (302), and the first gear transmission assembly (303) are installed in the handle (2). The transmission shaft (304) and the second gear transmission assembly (305) are installed in the machine head housing (101). One end of the linkage shaft (302) is fixedly connected to the second shaft-shaped connector (301), and the other end is drivenly connected to the first gear transmission assembly (303). One end of the transmission shaft (304) is drivenly connected to the first gear transmission assembly (303), and the other end is drivenly connected to the second gear transmission assembly (305). The second gear transmission assembly (305) is drivenly connected to the core assembly (102).

7. The dental handpiece with torque adjustment function according to claim 6, characterized in that, The handle (2) is detachably coupled to the head shell (101).

8. The dental handpiece with torque adjustment function according to any one of claims 1-7, characterized in that, The first connector (401) is provided with a guide post (401a) that is limited to the handle (2).

9. The dental handpiece with torque adjustment function according to any one of claims 1-7, characterized in that, The first block (405) is provided with a limiting protrusion (406c), and the second block (406) is provided with a limiting groove that cooperates with the limiting protrusion (406c). Alternatively, the second block (406) is provided with a limiting protrusion (406c), and the first block (405) is provided with a limiting groove that cooperates with the limiting protrusion (406c).

10. The dental handpiece with torque adjustment function according to any one of claims 1-7, characterized in that, The torque adjustment mechanism (4) further includes a first shaft-shaped connector (4014), the first end of which is connected to the first end of the power input shaft (403), and the second end of which is connected to the output end of the electric motor (200).

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