Gear box of phi 12 high-efficiency dental handpiece

Abstract

The utility model relates to the technical field of dental handpieces, in particular to a gear box of a phi 12 high-efficiency dental handpiece. The planetary gear transmission mechanism comprises an inner gear and a bottom plate, the inner gear is fixedly connected with the bottom plate, two-stage gear transmission is arranged in the inner gear, the first stage is that a motor gear is matched with a planetary gear and a planetary carrier, the planetary gear is connected with the planetary carrier through a gear shaft, and a planetary carrier gasket is arranged between the planetary gear and the planetary carrier. The second stage is that the sun gear is matched with a planetary gear and an output planet carrier, the planetary gear is connected with the output planet carrier through a gear shaft, and a planet carrier gasket is arranged between the planetary gear and the output planet carrier; direct contact friction between the planetary gears and the planetary carrier can be avoided, resistance generated during rotation friction of the planetary gears is smaller, the gears are not prone to abrasion during high-speed rotation, and the overall efficiency loss of the gearbox is smaller.

Description

TECHNICAL FIELD

[0001] The utility model relates to dental handpiece technical field, especially a gear box of high efficiency dental handpiece of phi 12. BACKGROUND

[0002] With the development of our society, people's living standards are higher and higher, and people's awareness of dental health is constantly improving. Under this background, the development of automation technology keeps pace with the times, and more and more automation products are applied to dental medical treatment. With people's increasing demand for low power loss of gear box motor, the efficiency of gear box is also required to be higher and higher.

[0003] Figure 1 、 Figure 2 It is an old gear box of phi 12, which has the following disadvantages and shortcomings:

[0004] Firstly, the contact area between the output shaft 06 of the old structure gear box and the hole in the cover plate 07 is large, which belongs to sliding friction. When the gear box is continuously loaded and operated for a long time, the hole in the cover plate 07 wears out quickly. Although there is grease lubrication in the transmission process, a large resistance will still be generated under high speed friction, which will lose some efficiency, thus reducing the overall transmission efficiency of the gear box.

[0005] Secondly, the material selection of the planetary gear of the old structure gear box is unreasonable. The old structure gear box adopts plastic inclined planetary gear 04 and steel straight gear 05. The surface roughness of the plastic inclined planetary gear 04 and the steel straight gear 05 is large, so the friction resistance generated when the gears mesh is larger, and the efficiency loss is more. Moreover, the noise generated when the steel straight gear 05 meshes is larger. At the same time, since the plastic inclined planetary gear 04 and the plastic inclined internal gear 02 are mold products, the gear precision is low, so the efficiency loss is more when transmitting.

[0006] Thirdly, the planet carrier 08 of the old structure gear box only has a middle hole and four gear shaft holes. The mass of the planet carrier 08 is large, so more force is needed to drive the planet carrier 08 to rotate when the gear box is working. Moreover, the old gear box adopts four steel straight gears 05 at each stage. The gears themselves have a certain mass, and the steel straight gear 05 contacts the internal gear 01 and the sun gear more when meshing, so the resistance is larger, and the transmission efficiency of the gear box is lower.

[0007] Fourthly, the steel straight gear 05 of the old structure gear box directly contacts the planet carrier 08. The roughness of the end face of the planet carrier 08 and the end face of the steel straight gear 05 is relatively large. When the gear box is working, the steel straight gear 05 rotates at high speed on the end face of the planet carrier 08. The end face of the steel straight gear 05 and the end face of the planet carrier 08 are easy to wear under high speed friction, which generates more resistance and reduces the transmission efficiency of the gear box.

[0008] Fifth point: the old structure gear box initial stage adopts steel helical gear 03, plastic helical planetary gear 04 structure, plastic helical planetary gear 04 generates axial force during transmission, under the action of axial force, plastic helical planetary gear 04 is extruded along the axial direction of the bottom plate gasket and planet carrier 08, thereby generating sliding friction in the end face contact area, reducing transmission efficiency; at the same time, the motor matched with the gear box is more easily damaged, thereby reducing the service life of the whole system;

[0009] Sixth point: the length of the old structure gear box is too long, which cannot meet the size requirements of the present medical instruments, the structure is not compact, the customer assembly space is limited, and the gear box cannot be used on compact and limited precision instruments.

[0010] The applicant improves the old gear box structure, develops and designs a new type of gear box structure to meet market demand, and specifically proposes the patent application. Practical new type content

[0011] The utility model discloses a kind of gear boxes of Φ12 high efficiency dental handpieces, which solves the defects of the gear box of the existing dental handpiece, such as large gear wear and large loss.

[0012] To achieve the above object, the utility model is realized by the following technical scheme.

[0013] A kind of gear box of Φ12 high efficiency dental handpiece, including inner gear, bottom plate, inner gear is fixedly connected with bottom plate, inner gear is provided with two-stage gear transmission in, first stage is motor gear cooperation planetary gear, planet carrier, planetary gear is connected planet carrier by gear shaft, planetary gear is provided with planet carrier gasket between planet carrier, second stage is sun gear cooperation planetary gear, output planet carrier, planetary gear is connected output planet carrier by gear shaft, planetary gear is provided with planet carrier gasket between output planet carrier.

[0014] Further, six through holes are formed in the planet carrier for fixing the gear shaft, three through holes are formed in the planet carrier gasket for fixing the gear shaft, and three planetary gears are provided.

[0015] Further, six through holes are formed in the planet carrier for fixing the gear shaft, three through holes are formed in the planet carrier gasket for fixing the gear shaft, and three planetary gears are provided.

[0016] Further, the output planet carrier is connected with the output shaft, the front end of the inner gear is connected with a cover plate, the cover plate is provided with a through hole for the output shaft to pass through, and a ball bearing is arranged between the cover plate and the output shaft. When the gear box rotates, the transmission efficiency is higher, the efficiency loss is smaller, and the efficiency of the gear box is improved.

[0017] Further, the inner side of the cover plate is formed with a groove, the groove is provided with a ball bearing, and the ball bearing is sleeved on the output shaft. The ball bearing is more stable in installation, and the stability of the output shaft is ensured.

[0018] Further, the inner wall of the inner gear is a straight tooth, and the motor gear and the planetary gear are straight gears. The axial force generated when the gear box rotates is avoided, the transmission efficiency of the gear box is improved, and the service life is improved.

[0019] The beneficial effects of the utility model lie in: the direct contact and friction between the planetary gear and the planet carrier can be avoided, the resistance generated when the planetary gear rotates and rubs is smaller, the gear is not easy to wear when rotating at high speed, and the efficiency loss of the gear box as a whole is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional view of the existing gear box.

[0021] Figure 2 It is an exploded view of the existing gear box.

[0022] Figure 3 It is a sectional view of the utility model.

[0023] Figure 4 It is an exploded view of the utility model.

[0024] Label and explanation:

[0025] Inner gear 01, plastic bevel inner gear 02, steel bevel gear 03, plastic bevel planetary gear 04, steel straight gear 05, output shaft 06, cover plate 07, planet carrier 08, inner gear 1, bottom plate 2, motor gear 3, planetary gear 4, gear shaft 5, planet carrier 6, planet carrier gasket 7, sun gear 8, output planet carrier 9, output shaft 10, cover plate 11, ball bearing 12. DETAILED DESCRIPTION

[0026] The utility model will be further described below in combination with the drawings.

[0027] See Figure 3 , Figure 4The utility model discloses a kind of gearboxes of Φ12 high-efficiency dental handpieces, it include: internal gear 1, bottom plate 2, internal gear 1 is fixedly connected with bottom plate 2, internal gear 1 is provided with two-stage gear transmission inside, first stage is motor gear 3 cooperation planetary gear 4, planet carrier 6, planetary gear 4 is connected planet carrier 6 by gear shaft 5, planetary gear 4 and planet carrier 6 between being provided with planet carrier gasket 7, planet carrier 6 is provided with six through holes for gear shaft 5 fixed, planet carrier gasket 7 is provided with three through holes for gear shaft 5 fixed, and planetary gear 4 has three;Second stage is sun gear 8 cooperation planetary gear 4, output planet carrier 9, planetary gear 4 is connected output planet carrier 9 by gear shaft 5, planetary gear 4 and output planet carrier 9 between being provided with planet carrier gasket 7, output planet carrier 9 is provided with six through holes for gear shaft 5 fixed, planet carrier gasket 7 is provided with three through holes for gear shaft 5 fixed, and planetary gear 4 has three;Output planet carrier 9 is connected with output shaft 10, output shaft 10 is sleeved with ball bearing 12, the front end of internal gear 1 is connected with cover plate 11, the inside of cover plate 11 is profiled with recess, recess is embedded with ball bearing 12, cover plate 11 is provided with through hole for output shaft 10 to pass through, and ball bearing 12 is sleeved on output shaft 10.

[0028] The utility model discloses a kind of gearboxes of Φ12 high-efficiency medical instruments, and the improvement scheme is as follows.

[0029] Improvement point 1: change cover plate 11 structure, increase 1 ball bearing at cover plate.

[0030] Change the structure of cover plate 11, increase 1 ball bearing 12 at cover plate 11, the transmission efficiency of ball bearing 12 is high, the efficiency that can be transmitted when gear box rotates is also higher, simultaneously, the sliding friction of output shaft 10 and cover plate 11 changes into rolling friction, and the efficiency loss of rolling friction is less than sliding friction, and after increasing ball bearing 12, the contact surface of output shaft 10 and cover plate 11 is also correspondingly reduced, the frictional resistance generated when high-speed rotating is smaller, and the efficiency loss of gear box is also less, so as to improve the efficiency of gear box.

[0031] Improvement point 2: the material of planetary gear 4 is changed from plastic and stainless steel to tin bronze.

[0032] The surface roughness of tin bronze material planetary gear 4 after finish machining is better than plastic and stainless steel, and the surface is smoother, the frictional resistance received when planetary gear 4 rotates is smaller, and tin bronze is a wear-reducing material, and the wear resistance is good, and the precision of planetary gear 4 after machining is also higher, so as to be less affected to the efficiency loss of gear box;Meanwhile, using tin bronze gear can reduce the noise of gear box, and also meet the demand of low-noise gear box in market.

[0033] Improvement point 3: the number of planetary gears 4 is changed from 4 to 3, and 3 through holes are reprocessed in the middle of the unused part of the planetary gear shaft hole position of the planet carrier, thereby improving the assembly convenience.

[0034] The weight of the gear is reduced, and the contact surface when the planetary gear 4 meshes with the internal gear 1 and the sun gear 8 is also reduced, and the frictional resistance generated is correspondingly reduced; meanwhile, 3 through holes are reprocessed in the middle of the unused part of the 3 gear shaft hole positions of the planet carrier 6, which can reduce the weight of the planet carrier 6, and the force required to drive the planet carrier 6 to rotate is also correspondingly reduced, and the response speed of the transmission is improved, and the transmission efficiency of the gear box is also improved.

[0035] Improvement point 4: one planet carrier pad 7 is added in the middle of the planetary gear 4 and the planet carrier 6 and in the middle of the planetary gear 4 and the output planet carrier 9.

[0036] The planetary gear 4 and the planet carrier 6 are prevented from directly contacting and rubbing, the surface roughness of the planet carrier pad 7 after processing is low, the surface is smoother, the resistance generated when the planetary gear 4 rotates and rubs on the surface of the planet carrier pad 7 is smaller, and the hardness of the planet carrier pad 7 is higher than that of the planet carrier 6, and the planet carrier pad 7 is more wear-resistant and is not easy to wear when the gear rotates at high speed, and the efficiency loss of the gear box as a whole is smaller.

[0037] Improvement point 5: the gear box structure is changed, and the primary helical gear is changed into a straight gear.

[0038] The motor gear 3 is a straight gear, and the planetary gear 4 matched with the motor gear 3 is also a straight gear, and through such a change, the axial force generated when the gear box rotates can be avoided, the sliding friction between the planetary gear 4 and the bottom plate pad and the end surface of the planet carrier 6 is reduced, the transmission efficiency of the gear box is improved, the service life of the motor matched with the gear box is improved, and the service life of the gear box motor is correspondingly improved.

[0039] Improvement point 6: the gear strength and service life are improved through optimization of gear parameters, and the length of the gear box is appropriately reduced; the strength and service life of the gear box are calculated according to known conditions, the gear thickness is reasonably distributed, the ideal strength and service life of the gear box are achieved, and the length of the gear box is appropriately shortened, so that the length required by medical instruments is met, and market demand is met.

[0040] The utility model mainly applies to dental handpiece, dental nursing, precision instrument, medical instrument, medical equipment and the field.

[0041] Of course, the above-mentioned embodiments are only preferred examples of the present application, and are not intended to limit the scope of the present application. Therefore, equivalent changes or modifications made in accordance with the structure, features and principles described in the patent application of the present application shall be included in the patent application of the present application.

Claims

1. A gear box for a Φ 12 high efficiency dental handpiece, characterized by: The inner gear is fixedly connected with the bottom plate, the inner gear is internally provided with two-stage gear transmission, the first stage is motor gear cooperation planetary gear and planet carrier, the planetary gear is connected with the planet carrier through a gear shaft, planet carrier gaskets are arranged between the planetary gear and the planet carrier, the second stage is sun gear cooperation planetary gear and output planet carrier, the planetary gear is connected with the output planet carrier through a gear shaft, planet carrier gaskets are arranged between the planetary gear and the output planet carrier.

2. A gear box for a Φ 12 high efficiency dental handpiece according to claim 1 characterized in that: Six through holes are formed in the planet carrier for fixing the gear shaft, three through holes are formed in the planet carrier gasket for fixing the gear shaft, and the planet gear has three.

3. A gear box for a Φ 12 high efficiency dental handpiece according to claim 1 characterized in that: Six through holes are formed in the planet carrier for fixing the gear shaft, three through holes are formed in the planet carrier gasket for fixing the gear shaft, and the planet gear has three.

4. The gear box of a Φ 12 high efficiency dental handpiece according to claim 1, characterized in that: The output planet carrier is connected with the output shaft, the front end of the inner gear is connected with a cover plate, the cover plate is provided with a through hole for the output shaft to pass through, and a ball bearing is arranged between the cover plate and the output shaft.

5. A gear box for a Φ 12 high efficiency dental handpiece according to claim 4, characterized in that: A groove is formed in the inner side of the cover plate, the groove is embedded with a ball bearing, and the ball bearing is sleeved on the output shaft.

6. A gear box for a Φ 12 high efficiency dental handpiece according to claim 1 characterized by: The inner wall of the inner gear is a straight tooth, and the motor gear and the planetary gear are straight gears.

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