Dental handpiece telescopic handpiece with single-stage speed reduction

Abstract

The dental handpiece telescopic handpiece comprises a speed reduction part and a telescopic part, the speed reduction part comprises a transmission shaft and a gear, one end of the transmission shaft is connected with a power source, and the other end of the transmission shaft is connected with a connecting gear; the telescopic part comprises a fixed transmission shaft, a telescopic assembly and a movement assembly, one end of the fixed transmission shaft is connected with the gear, the other end is connected with one end of the telescopic assembly, and the other end of the telescopic assembly is connected with the movement assembly; the telescopic assembly comprises a telescopic transmission shaft and a shaft sleeve sleeving the telescopic transmission shaft, the telescopic transmission shaft extends into an inner cavity in one end of the fixed transmission shaft, the shaft sleeve wraps the outer wall of the fixed transmission shaft, and the telescopic transmission shaft and the shaft sleeve can slide relative to the fixed transmission shaft. The machine head adopts single-stage speed reduction and is low in noise, high in transmission efficiency, simple in structure, convenient to assemble, high in production efficiency and low in cost, and the telescopic transmission shaft can stretch and retract relative to the fixed transmission shaft, so that the distance between the machine head assembly and the fixed transmission shaft is adjusted, and a user can treat teeth at different positions conveniently.

Description

Technical Field

[0001] This utility model relates to the field of dental medical device technology, specifically a single-stage deceleration dental handpiece telescopic head. Background Technology

[0002] Dental handpieces are essential tools for dentists to perform dental treatments. Telescopic dental handpieces allow dentists to adjust their length according to the position of the teeth during treatment, providing a comfortable and convenient treatment posture. Existing telescopic handpieces mainly consist of a multi-stage gear reducer and a telescopic mechanism. Their complex structure makes assembly and maintenance difficult, and they suffer from low efficiency in manufacturing, significant torque loss during use, high noise levels both under no-load and during operation, and low output speed. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-stage deceleration dental handpiece telescopic head.

[0004] The technical solution to achieve the purpose of this utility model is:

[0005] A single-stage deceleration dental handpiece telescopic head includes a deceleration section and a telescopic section, wherein:

[0006] The deceleration section includes a drive shaft and a gear, with one end of the drive shaft connected to a power source and the other end connected to the gear;

[0007] The telescopic part includes a fixed drive shaft, a telescopic assembly, and a mechanism assembly. One end of the fixed drive shaft is connected to the gear, the other end of the fixed drive shaft is connected to one end of the telescopic assembly, and the other end of the telescopic assembly is connected to the mechanism assembly; wherein:

[0008] The telescopic assembly includes a telescopic drive shaft and a bushing sleeved outside the telescopic drive shaft. The telescopic drive shaft extends into the inner cavity of one end of a fixed drive shaft, and the bushing sleeve wraps around the outer wall of the fixed drive shaft. The telescopic drive shaft and the bushing sleeve can slide relative to the fixed drive shaft.

[0009] The gear is connected to a fixed transmission shaft via a bearing, which is mounted on a bearing housing.

[0010] The fixed drive shaft is provided with an adapter, and an annular cavity is formed between the outer wall of the fixed drive shaft and the adapter, and the bushing can slide in the annular cavity.

[0011] The adapter is also equipped with an outer cover. An O-ring is provided between the outer cover and the adapter near the end of the mechanism assembly, and the contact surface between the outer cover and the O-ring is set as an inclined surface. The outer cover can rotate relative to the adapter. The clamping force on the bushing is adjusted by adjusting the amount of compression of the O-ring by the outer cover. When the amount of compression of the O-ring is reduced by rotating the outer cover, the bushing and the telescopic transmission shaft can be moved relative to the fixed transmission shaft, thereby adjusting the length between the head assembly and the fixed transmission shaft. When the head assembly needs to work, the amount of compression of the O-ring by the outer cover is increased, so that the outer cover clamps the bushing, thereby realizing the adjustment of different lengths.

[0012] The telescopic drive shaft is also provided with a drive pin at the end where it connects to the fixed drive shaft.

[0013] This utility model provides a single-stage reduction dental handpiece telescopic head. The handpiece adopts a single-stage reduction, which results in lower noise, higher transmission efficiency, simple structure, easy assembly, high production efficiency, and low cost. Furthermore, the telescopic transmission shaft can move relative to the fixed transmission shaft, i.e., it can extend and retract, thereby adjusting the distance between the handpiece assembly and the fixed transmission shaft, which is convenient for users to treat teeth in different positions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a single-stage deceleration dental handpiece telescopic head according to an embodiment of this application;

[0015] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0016] In the diagram: 1. Drive shaft 2. Connecting gear 3. Bearing seat 4. Bearing 5. Adapter 6. Outer cover 7. Telescopic drive shaft 8. Bushing 9. Fixed rotating shaft 10. Drive pin 11. Z8 gear 12. Mechanism assembly 13. First O-ring 14. Inclined surface 15. Second O-ring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the present invention. Example

[0018] like Figure 1 As shown, a single-stage deceleration dental handpiece telescopic head includes a deceleration section and a telescopic section, wherein:

[0019] The deceleration section includes a drive shaft 1 and a gear 2. One end of the drive shaft 1 is connected to the power source, and the other end is connected to the gear 2 through a bearing.

[0020] The telescopic part includes a fixed drive shaft 9, a telescopic assembly, and a mechanism assembly 12. One end of the fixed drive shaft 9 is connected to the gear 2, the other end of the fixed drive shaft 9 is connected to one end of the telescopic assembly, and the other end of the telescopic assembly is connected to the mechanism assembly 12; wherein:

[0021] The telescopic assembly includes a telescopic drive shaft 7 and a bushing 8 sleeved on the outside of the telescopic drive shaft 7. The telescopic drive shaft 7 extends into the inner cavity of one end of the fixed drive shaft 9, and the bushing 8 wraps around the outer wall of the fixed drive shaft 9. The telescopic drive shaft 7 and the bushing 8 can slide relative to the fixed drive shaft 9.

[0022] In this embodiment, the gear 2 is connected to the fixed transmission shaft 9 via a bearing 4, and the bearing 4 is mounted on a bearing seat 3.

[0023] The fixed transmission shaft 9 is provided with an adapter 5. An annular cavity is formed between the outer wall of the fixed transmission shaft 9 and the adapter 5, and the bushing 8 can slide in the annular cavity.

[0024] like Figure 2 As shown, the adapter 5 is also provided with an outer cover 6. A first O-ring 13 is provided between the outer cover 6 and the adapter 5 near the end of the mechanism assembly 12, and the contact surface between the outer cover 6 and the first O-ring 13 is set as an inclined surface 14. The outer cover 6 can rotate relative to the adapter 5. The clamping force on the bushing 8 can be adjusted by adjusting the amount of compression of the outer cover 6 on the first O-ring 13. When the amount of compression of the first O-ring 13 is reduced by rotating the outer cover 6, the bushing 8 and the telescopic transmission shaft 7 can be moved relative to the fixed transmission shaft 9, thereby adjusting the length between the mechanism assembly 12 and the fixed transmission shaft 9. When the mechanism assembly 12 needs to work, the amount of compression of the first O-ring 13 by the outer cover 6 is increased, so that the outer cover 6 clamps the bushing 9, thereby realizing the adjustment of different lengths.

[0025] The connection between the adapter 5 and the outer cover 6 can be a threaded connection, a snap-fit ​​connection, or other methods.

[0026] The outer cover 6 can be clamped to the bushing 8 by pressing with the first O-ring, or by other methods such as pressing with an inclined surface or locking with a groove.

[0027] like Figure 2 As shown, the bushing 8 has a groove, and a second O-ring 15 is provided in the groove to achieve a seal between the bushing 8 and the adapter 5.

[0028] The bushing 9 is also provided with a groove, and a second O-ring 15 is provided in the groove to seal the bushing 9 and the adapter 5.

[0029] The telescopic drive shaft 7 is connected to the fixed drive shaft 9 at one end and is also provided with a drive pin 10. The drive pin 10 is located in the hollow hole of the fixed drive shaft 9 and is placed in the groove on the fixed drive shaft 9. When the fixed drive shaft 9 rotates, it will drive the telescopic drive shaft 7 to rotate. When the telescopic drive shaft 7 extends and retracts, it will drive the drive pin 10 to move back and forth in the groove. With this setting, the telescopic drive shaft 7 can extend and retract without affecting the transmission.

Claims

1. A single-stage deceleration dental handpiece telescopic head, characterized in that, Includes a deceleration section and a telescopic section, wherein: The deceleration section includes a drive shaft and a gear. One end of the drive shaft is connected to the power source, and the other end is connected to the connecting gear. The telescopic part includes a fixed drive shaft, a telescopic assembly, and a mechanism assembly. One end of the fixed drive shaft is connected to the gear, the other end of the fixed drive shaft is connected to one end of the telescopic assembly, and the other end of the telescopic assembly is connected to the mechanism assembly. The telescopic assembly includes a telescopic drive shaft and a bushing sleeved outside the telescopic drive shaft. The telescopic drive shaft extends into the inner cavity of one end of the fixed drive shaft, and the bushing sleeve wraps around the outer wall of the fixed drive shaft. The telescopic drive shaft and the bushing sleeve can slide relative to the fixed drive shaft.

2. The dental handpiece telescopic head with single-stage deceleration according to claim 1, characterized in that, The gear is connected to a fixed transmission shaft via a bearing, which is mounted on a bearing housing.

3. The dental handpiece telescopic head with single-stage reduction according to claim 1, characterized in that, The fixed drive shaft is provided with an adapter, and an annular cavity is formed between the outer wall of the fixed drive shaft and the adapter, and the bushing can slide in the annular cavity.

4. The dental handpiece telescopic head with single-stage reduction according to claim 3, characterized in that, The adapter is also provided with an outer cover. An O-ring is provided between the outer cover and the adapter near the end of the mechanism assembly. The contact surface between the outer cover and the O-ring is set as an inclined surface. The outer cover can rotate relative to the adapter.

5. The dental handpiece telescopic head with single-stage reduction according to claim 1, characterized in that, The telescopic drive shaft is also provided with a drive pin at the end where it connects to the fixed drive shaft.

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