阅读说明：本技术 输出轴密封结构以及带有该输出轴密封结构的行星齿轮箱 (Output shaft sealing structure and planetary gear box with same ) 是由 史锋 金万兵 李思成 蒋浣浣 姬中营 于 2020-05-30 设计创作，主要内容包括：本发明涉及一种输出轴密封结构以及带有该输出轴密封结构的行星齿轮箱,包括齿轮箱本体以及设置在齿轮箱本体内的三级行星齿轮传动机构,所述的齿轮箱本体包括输出轴密封结构和内齿圈,所述的输出轴和内齿圈分别与三级行星齿轮传动机构相匹配,所述的输出轴密封结构包括输出轴、密封件以及前端盖,所述的密封件安装在前端盖内孔中,并与输出轴同轴设置。与现有技术相比,本发明具有可有效防止外部环境中的水汽进入齿轮箱,从而延长了整个齿轮箱的使用寿命等优点。(The invention relates to an output shaft sealing structure and a planetary gear box with the same, which comprises a gear box body and a three-stage planetary gear transmission mechanism arranged in the gear box body, wherein the gear box body comprises the output shaft sealing structure and an inner gear ring, the output shaft and the inner gear ring are respectively matched with the three-stage planetary gear transmission mechanism, the output shaft sealing structure comprises an output shaft, a sealing element and a front end cover, and the sealing element is arranged in an inner hole of the front end cover and is coaxially arranged with the output shaft. Compared with the prior art, the invention has the advantages that the water vapor in the external environment can be effectively prevented from entering the gear box, so that the service life of the whole gear box is prolonged, and the like.)

1. The output shaft sealing structure is characterized by comprising an output shaft (10), a sealing element (8) and a front end cover (9), wherein the sealing element (8) is arranged in an inner hole of the front end cover (9) and is coaxially arranged with the output shaft (10).

2. An output shaft sealing arrangement according to claim 1, characterised in that the seal (8) is a composite seal consisting of an O-ring and a support ring.

3. A planetary gearbox with an output shaft sealing structure according to claim 1, characterized by comprising a gearbox body and a three-stage planetary gear transmission mechanism arranged in the gearbox body, wherein the gearbox body comprises the output shaft sealing structure and an inner gear ring (1), and the output shaft (10) and the inner gear ring (1) are respectively matched with the three-stage planetary gear transmission mechanism.

4. A planetary gearbox according to claim 3, characterised in that said three stage planetary gearing comprises an input stage planet wheel (2), a planet carrier a (3), an output stage planet wheel (4), a planet carrier B (5), a planet pin B (12), a sun wheel (13) and a planet pin a (14), said planet carrier a (3) being connected to the planet pin a (14), said planet carrier B (5) being connected to the planet pin B (12), said output stage planet wheel (2) being arranged on the planet pin a (14), said output stage planet wheel (4) being arranged on the planet pin B (12), said planet carrier B (5) being arranged in the annulus gear (1) and abutting against the inner end surface of the output shaft (10), said planet carrier B (5) rotating axially driving the sun wheel (13) to rotate axially together.

5. An epicyclic gearbox according to claim 4, wherein said input stage planet (2) is a planet made of a plastics material.

6. The planetary gearbox as claimed in claim 4, wherein the planetary pins B (12) and A (14) are made of ceramic materials.

7. An epicyclic gearbox according to claim 4, wherein said gearbox body further comprises a bearing seat (6), a bearing (11), a rear end cover (16), said annulus gear (1) being connected to said bearing seat (6) and said front end cover (9) respectively, said bearing (11) being disposed on said output shaft (10) and on said bearing seat (6).

8. An epicyclic gearbox according to claim 7, wherein said annulus gear (1) is connected to said bearing block (6) and said front end cover (9) by laser welding.

9. An epicyclic gearbox according to claim 4, wherein said bearing housing (6) is provided with an opening for the placement of a bearing (11).

10. An epicyclic gearbox according to claim 4, wherein said bearing (11) is a rolling bearing.

Technical Field

The invention relates to the technical field of micro transmission mechanisms, in particular to an output shaft sealing structure and a planetary gear box with the same.

Background

At present, miniature gear boxes with small size and high reduction ratio are more and more widely used, such as electronic door locks, communication equipment, precise instruments, medical equipment, smart homes and the like. The micro planetary gear transmission is combined with various micro motors to form an ideal novel micro-electromechanical integrated transmission mechanism.

The micro planetary gear box in the prior art is lubricated by grease, and the consistency grade of the grease is basically about NLGI-1.5, so that the micro planetary gear box does not need to be sealed to prevent the grease from leaking. However, the gear box with the structure has the defect that external water vapor cannot be prevented from entering the gear box, so that the lubricating performance of grease is damaged, and the gear transmission fails. In addition, in the prior art, the drive motor is connected with the gear ring of the gear box and the gear ring is connected with the bearing seat through threads, cylindrical pins or screws, so that the connection reliability is not uniform, and the appearance of the whole gear box is influenced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an output shaft sealing structure and a planetary gear box with the same, which can effectively prevent water vapor in the external environment from entering the gear box, thereby prolonging the service life of the whole gear box.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an output shaft seal structure, includes output shaft, sealing member and front end housing, the sealing member install in the front end housing hole to with output shaft coaxial arrangement.

Preferably, the sealing element is a composite sealing element consisting of an O-shaped ring and a supporting ring.

The planetary gear box with the output shaft sealing structure comprises a gear box body and a three-stage planetary gear transmission mechanism arranged in the gear box body, wherein the gear box body comprises the output shaft sealing structure and an inner gear ring, and the output shaft and the inner gear ring are respectively matched with the three-stage planetary gear transmission mechanism.

Preferably, the three-stage planetary gear transmission mechanism comprises an input stage planetary gear, a planetary carrier a, an output stage planetary gear, a planetary carrier B, a planetary pin B, a sun gear and a planetary pin a, the planetary carrier a is connected with the planetary pin a, the planetary carrier B is connected with the planetary pin B, the output stage planetary gear is arranged on the planetary pin a, the output stage planetary gear is arranged on the planetary pin B, the planetary carrier B is arranged in the inner gear ring and is attached to the inner end face of the output shaft, and the planetary carrier B axially rotates to drive the sun gear to axially rotate together.

Preferably, the input stage planet wheel is a planet wheel made of a plastic material.

Preferably, the planet pin shaft B and the planet pin shaft A are made of ceramic materials.

Preferably, the gear box body further comprises a bearing seat, a bearing and a rear end cover, the inner gear ring is respectively connected with the bearing seat and the front end cover, and the bearing is arranged on the output shaft and arranged on the bearing seat.

Preferably, the inner gear ring is respectively connected with the bearing seat and the front end cover by laser welding.

Preferably, the bearing seat is provided with an opening for placing the bearing.

Preferably, the bearing adopts a rolling bearing.

Compared with the prior art, the invention has the following advantages:

1) the output shaft sealing mechanism can effectively prevent water vapor in the external environment from entering the gear box, so that the service life of the whole gear box is prolonged;

2) the noise of the gear box is effectively reduced, and the overall operation stability of the micro gear box is improved;

3) the traditional connection mode of the motor and the gear box and the traditional connection mode of the gear ring and the bearing seat are avoided, and the motor and the gear box are connected in a laser welding mode, so that the reliability and the strength of the motor and the gear ring are higher, and the appearance is attractive;

4) the output shaft is in limit fit with the planet carrier through the positioning part of the output shaft, and the output shaft is welded with the inner ring of the bearing close to the output direction, so that the movement limit along the central shaft towards the outer end direction of the output shaft is formed, thus the problem that the output shaft moves towards the outer part of the gear box to be separated is avoided, the integral operation stability of the micro gear box is effectively improved, and the service life of the micro gear box is further prolonged;

5) the gear box is simple in structure and convenient to process and assemble.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

fig. 4 is a schematic view of the sealing structure of the present invention.

The device comprises a gear ring 1, an inner gear ring 2, an input stage planet wheel 3, planet carriers A and 4, an output stage planet wheel 5, planet carriers B and 6, a bearing seat 7, a spacer sleeve 8, a sealing element 9, a front end cover 10, an output shaft 11, a bearing 12, planet pin shafts B and 13, a sun wheel 14, planet pin shafts A and 15, a motor gear 16 and a rear end cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

As shown in fig. 4, the output shaft sealing structure comprises an output shaft 10, a sealing member 8 and a front end cover 9, wherein the sealing member 8 is installed in an inner hole of the front end cover 9 and is coaxially arranged with the output shaft 10. The sealing element 8 is a composite sealing element consisting of an O-shaped ring and a supporting ring.

As shown in fig. 1 to 3, a planetary gear box with an output shaft sealing structure comprises a gear box body and a three-stage planetary gear transmission mechanism arranged in the gear box body, wherein the gear box body comprises an output shaft sealing structure and an inner gear ring 1, and an output shaft 10 and the inner gear ring 1 are respectively matched with the three-stage planetary gear transmission mechanism. The structure has the advantages of simple structure, strong reliability, convenient manufacture and the like.

The three-stage planetary gear transmission mechanism comprises an input stage planetary gear 2, a planetary carrier A3, an output stage planetary gear 4, a planetary carrier B5, a planetary pin shaft B12, a sun gear 13 and a planetary pin shaft A14, the planetary carrier A3 is connected with the planetary pin shaft A14, the planetary carrier B5 is connected with the planetary pin shaft B12, the output stage planetary gear 2 is arranged on the planetary pin shaft A14, the output stage planetary gear 4 is arranged on the planetary pin shaft B12, the planetary carrier B5 is arranged in an inner gear ring 1 and clings to the inner end face of the output shaft 10, the output shaft 10 penetrates through a shell formed by the inner gear ring 1, a bearing 11 and a front end cover 9, the tail end of the output shaft 10 extends into the shell and is rotationally positioned with the planetary carrier B5, and the planetary carrier B5 axially rotates to drive the sun gear 13 to axially rotate together. The output shaft 10 is arranged on a planet carrier B5, the center of the planet carrier B5 is provided with a mounting hole, a distribution circle is provided with a planet pin shaft mounting hole, the planet pin shaft B is assembled on the distribution round hole of the planet carrier, and the sun gear 13 is arranged in the central hole of the planet carrier B5;

the input stage planet wheel 2 is a planet wheel made of plastic materials.

The planet pin B12 and the planet pin A14 are made of ceramic materials, so that abrasion can be effectively reduced, and the service life of the gear box is prolonged.

The gear box body further comprises a bearing seat 6, a bearing 11 and a rear end cover 16, the inner gear ring 1 is respectively connected with the bearing seat 6 and the rear end cover 16, and the bearing 11 is arranged on the output shaft 10 and arranged on the bearing seat 6.

The inner gear ring 1 is respectively connected with the bearing seat 6 and the front end cover 9 in a laser welding mode, so that the reliability and the strength are higher, and the appearance is attractive.

The bearing seat 6 is provided with an opening for placing the bearing 11. The bearing 11 adopts a rolling bearing, and a shaft body can be rotatably arranged in the bearing in a penetrating way.

The micro gear box and the sealing mechanism of the output shaft thereof effectively reduce the noise of the gear box, improve the overall operation stability of the micro gear box, and simultaneously effectively prevent water vapor in the external environment from entering the gear box by the sealing mechanism of the output shaft, thereby prolonging the service life of the whole gear box.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.