Planetary reducer with small size and large reduction ratio

Abstract

An output gear ring and an end cover are sequentially arranged at the right side end of a shell to form a mounting shell, a planet carrier is arranged in the center of the interior of the mounting shell, a plurality of planet wheels are evenly distributed on the periphery of the right side of the planet carrier, a sun wheel is further inserted into the right side end of the planet carrier, and the sun wheel is meshed with the planet wheels at the same time; the outer side of the tail end of the left side of the planet carrier is sleeved with an eccentric shaft sleeve, the outer side of the head end of the right side of the planet carrier is sleeved with a fixed duplicate gear, the outer side of the fixed duplicate gear is sleeved with a middle duplicate gear, the fixed duplicate gear and the middle duplicate gear are each provided with an outer gear and an inner gear, and the inner gear of the fixed duplicate gear is meshed with a plurality of planet gears at the same time. An inner gear of the middle duplicate gear is meshed with an outer gear of the fixed duplicate gear, and an inner gear ring of the output gear ring is meshed with an outer gear of the middle duplicate gear. The planetary reducer solves the problem that an existing planetary reducer is too large in size when a large reduction ratio is achieved, and the requirement for high-reduction-ratio transmission in a limited space is met.

Description

Technical Field

[0001] The invention relates to a planetary reducer, in particular to a planetary reducer with a small volume and a large reduction ratio. Background Art

[0002] Among the numerous mechanical transmission devices, the reducer plays a vital role. It is widely used in industrial production, robotics, aerospace and other fields to reduce the speed and increase the torque. With the continuous development of modern industry, the performance requirements for reducers are getting higher and higher, especially in some occasions where space is limited but a large reduction ratio is required, such as small robot joints, precision instruments and equipment. Traditional planetary reducers often face the problem of increased volume when achieving a large reduction ratio, which limits their application in certain specific scenarios. Therefore, it is of great practical significance to develop a planetary reducer with a large reduction ratio and small volume. Summary of the invention

[0003] The purpose of the present invention is to provide a planetary reducer with a small volume and a large reduction ratio, so as to solve the problem that the existing planetary reducer is too large in volume when achieving a large reduction ratio, and meet the demand for high reduction ratio transmission in a limited space.

[0004] The technical solution of the present invention is a planetary reducer with a small volume and a large reduction ratio, comprising a shell, an output gear ring and an end cover are sequentially arranged at the right end of the shell, and the three are fixedly connected together to form an installation shell, a planet carrier is arranged at the center inside the installation shell, a plurality of planetary gears are evenly distributed on the right outer periphery of the planet carrier, a sun gear is also inserted into the right end of the planet carrier, the sun gear is meshed with a plurality of planetary gears at the same time, an eccentric shaft sleeve is sleeved on the outer side of the left tail end of the planet carrier, a fixed double gear is sleeved on the outer side of the right head end of the planet carrier, an intermediate double gear is sleeved on the outer side of the fixed double gear, the fixed double gear and the intermediate double gear are both arranged with external gears and internal gears, wherein the internal gear of the fixed double gear is meshed with a plurality of planetary gears at the same time, the internal gear of the intermediate double gear is meshed with the external gear of the fixed double gear, the internal gear of the output gear ring is meshed with the external gear of the intermediate double gear, and a sun gear support cover is also arranged on the outer side of the right end of the sun gear.

[0005] In the aforementioned small-volume, large-reduction-ratio planetary reducer, a plurality of mounting openings are provided on the right periphery of the planet carrier, and after the planet column passes through the planet carrier and the planetary wheel, the planetary wheel is fixed at the mounting opening.

[0006] In the aforementioned small-volume, large-reduction-ratio planetary reducer, a connecting hole is provided at the right end of the sun gear, and a through hole corresponding to the position of the connecting hole is provided on the sun gear support cover.

[0007] In the aforementioned small-volume, high-reduction-ratio planetary reducer, a plurality of fixing holes are evenly distributed on the right end surface of the fixed duplex gear.

[0008] In the aforementioned small-volume, large-reduction-ratio planetary reducer, a keyway is provided at the left end of the planetary carrier, a flat key is inserted into the keyway, and a slot is provided inwardly extending from the left end of the eccentric sleeve, and the exposed end of the flat key is inserted into the slot.

[0009] In the aforementioned small-volume, large-reduction-ratio planetary reducer, the sun gear is sleeved with a bearing, which supports the sun gear support cover; the planetary carrier is sleeved with a bearing, which supports the fixed duplex gear; the left side of the fixed duplex gear is sleeved with a plurality of bearings, which support the eccentric shaft sleeve, and the right side of the fixed duplex gear is sleeved with a bearing, which supports the end cover; the eccentric shaft sleeve is sleeved with a plurality of bearings, which respectively support the housing and the intermediate duplex gear.

[0010] Beneficial effects of the present invention: Compared with the prior art, the fixed double gear in the above technical solution of the present invention serves as both the inner gear ring of the first stage reducer and the fixed outer gear of the second stage reducer. By embedding the first stage reducer inside the second stage reducer, the reduction ratio is improved without increasing the overall structural size. A large reduction ratio is achieved, which can meet the demand for high reduction ratio transmission in a limited space. Moreover, the overall structure is small in size and light in weight, easy to install and use, and suitable for various miniaturized equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 An exploded view of the present invention; Figure 3 It is a schematic diagram of the eccentric sleeve of the present invention; Figure 4 It is a schematic diagram of a double gear of the present invention; Figure 5 It is a schematic diagram of a fixed double gear of the present invention; Figure 6 It is a schematic structural diagram of the planetary gear and the planetary carrier of the present invention; Figure 7 It is a schematic diagram of the structure of the output ring gear.

[0012] Figure numerals: 1-end cover, 2-sun gear support cover, 3-sun gear, 4-planetary gear, 5-planet column, 6-planet carrier, 7-fixed duplex gear, 8-inner ring gear, 9-screw, 10-output ring gear, 11-housing, 12-intermediate duplex gear, 13-eccentric shaft sleeve, 14-flat key. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0014] An embodiment of the present invention: A planetary reducer with a small volume and a large reduction ratio comprises a shell 11, an output gear ring 10 and an end cover 1 are sequentially arranged at the right end of the shell 11, and the three are fixedly connected together to form an installation shell, a planet carrier 6 is arranged at the center inside the installation shell, a plurality of planetary gears 4 are evenly distributed on the right outer periphery of the planet carrier 6, a sun gear 3 is also inserted into the right end of the planet carrier 6, and the sun gear 3 is meshed with a plurality of planetary gears 4 at the same time, an eccentric shaft sleeve 13 is sleeved on the outer side of the left tail end of the planet carrier 6, a fixed double gear 7 is sleeved on the outer side of the right head end of the planet carrier 6, a double gear 12 is sleeved on the outer side of the fixed double gear 7, and an external gear and an internal gear are arranged on the fixed double gear 7 and the intermediate double gear 12, wherein the internal gear of the fixed double gear 7 is meshed with a plurality of planetary gears 4 at the same time, the internal gear of the intermediate double gear 12 is meshed with the external gear of the fixed double gear 7, the internal gear 8 of the output gear ring 10 is meshed with the external gear of the intermediate double gear 12, and a sun gear support cover 2 is also arranged on the outer side of the right end of the sun gear 3.

[0015] The right outer periphery of the planet carrier 6 is provided with a plurality of mounting openings. After the planet column 5 passes through the planet carrier 6 and the planetary gear 4, the planetary gear 4 is fixed at the mounting openings.

[0016] The right side end of the sun gear 3 is provided with a connection hole, and the sun gear support cover 2 is provided with a through hole corresponding to the position of the connection hole. The connection hole facilitates the connection of the sun gear 3 with an external power source, thereby providing power input to the reducer.

[0017] The right end surface of the fixed double gear 7 is evenly distributed with a plurality of fixing holes, which are connected to an external mechanism through the fixing holes to fix the entire reducer.

[0018] The left end of the planet carrier 6 is provided with two key slots, each of which is inserted with a flat key 14. The left end of the eccentric sleeve 13 is provided with two slots extending inwardly, and the exposed ends of the flat key 14 are inserted into the slots. Through this structure, power is transmitted from the planet carrier 6 to the eccentric sleeve 13.

[0019] The sun gear 3 is sleeved with a bearing, which supports the sun gear support cover 2; the planetary carrier 6 is sleeved with a bearing, which supports the fixed duplex gear 7; the left side of the fixed duplex gear 7 is sleeved with multiple bearings, which support the eccentric shaft sleeve 13, and the right side of the fixed duplex gear 7 is sleeved with a bearing, which supports the end cover 1; the eccentric shaft sleeve 13 is sleeved with multiple bearings, which respectively support the housing 11 and the intermediate duplex gear 12, and support between adjacent components is achieved through the bearings.

[0020] The present invention discloses a planetary reducer with a large reduction ratio and a small volume, comprising an end cover 1, a sun gear support cover 2, a sun gear 3, a planetary gear 4, a planetary column 5, a planetary carrier 6, a fixed double gear 7, an inner gear ring 8, a screw 9, an output gear ring 10, a housing 11, an intermediate double gear 12, an eccentric shaft sleeve 13, and a flat key 14.

[0021] The sun gear 3 is connected to an external power source as an input end, and is located at a central position, with its external teeth meshing with the external teeth of a plurality of planetary gears 4 .

[0022] The sun gear support cover 2 is fixed on the fixed duplex gear 7 to support the sun gear 3 .

[0023] The fixed double gear 7 includes an internal gear and an external gear, and serves as a fixed component of the reducer for connecting and fixing the reducer with an external mechanism.

[0024] The planetary gears 4 are evenly distributed around the sun gear 3 , and the outer teeth of the planetary gears 4 are meshed with the inner teeth of the fixed duplex gear 7 at the same time.

[0025] The planet carrier 6 is used to install the planetary gear 4, and the planetary gear 4 is fixed to the planet carrier 6 through the planetary column 5, and the power of the planetary gear 4 is transmitted.

[0026] The sun gear 3 to the planetary gear 4 to the planetary carrier 6, and the internal gear of the fixed double gear 7 serve as the power transmission path of the fixed gear, which is the first stage reduction of the reducer.

[0027] The further eccentric sleeve 13 is arranged on the fixed double gear 7 through a bearing, and transmits the power from the planetary carrier 6 through the flat key 14, thereby transmitting the power of the first-stage reducer.

[0028] The intermediate double gear 12 also includes an internal gear and an external gear. The intermediate double gear 12 is arranged on the eccentric sleeve 13 through a bearing, and the internal gear of the intermediate double gear 12 is meshed with the external gear of the fixed double gear 7.

[0029] The inner ring gear 8 of the output ring gear 10 meshes with the outer gear of the intermediate double gear 12 .

[0030] The housing 11 and the end cover 8 are connected to the output ring gear 10 through screws 9. The output ring gear 10, the housing 11 and the end cover 8 are used as a whole for the power output of the entire reducer.

[0031] The power transmission path from the planet carrier 6 to the eccentric shaft 13 to the intermediate duplex gear 12 to the output ring gear 10, with the outer gear of the fixed duplex gear 7 serving as the fixed gear, is the second stage reduction of the reducer.

[0032] There is a difference in the number of teeth between the external gear of the fixed duplex gear 7 of the second-stage reducer and the internal gear of the intermediate duplex gear 12, and between the external gear of the intermediate duplex gear 12 and the internal gear ring 8 of the output gear ring 10. The external gear of the fixed duplex gear 7 serves as a fixed gear, and the eccentric wheel sleeve 13 drives the intermediate duplex gear 12 to rotate one circle, and the output gear ring 10 rotates relative to the external gear of the fixed duplex gear 7 by an angle corresponding to the difference in the number of teeth.

Claims

1. A planetary reducer with small volume and large reduction ratio, characterized in that: The invention comprises a housing (11), wherein an output gear ring (10) and an end cover (1) are sequentially arranged at the right end of the housing (11), and the three are fixedly connected together to form an installation housing, wherein a planet carrier (6) is arranged at the center of the installation housing, and a plurality of planetary gears (4) are evenly distributed on the right outer periphery of the planet carrier (6), and a sun gear (3) is also inserted into the right end of the planet carrier (6), and the sun gear (3) is meshed with the plurality of planetary gears (4) at the same time, an eccentric shaft sleeve (13) is sleeved on the outer side of the left tail end of the planet carrier (6), and a fixed double gear sleeve (13) is sleeved on the outer side of the right head end of the planet carrier (6). The fixed double gear (7) is sleeved with an intermediate double gear (12) on the outside, and the fixed double gear (7) and the intermediate double gear (12) are both provided with external gears and internal gears, wherein the internal gear of the fixed double gear (7) is meshed with a plurality of planetary gears (4) at the same time, the internal gear of the intermediate double gear (12) is meshed with the external gear of the fixed double gear (7), the internal gear ring (8) of the output gear ring (10) is meshed with the external gear of the intermediate double gear (12), and a sun gear support cover (2) is also provided on the outside of the right end of the sun gear (3).

2. A planetary reducer with small volume and large reduction ratio according to claim 1, characterized in that: The right outer periphery of the planet carrier (6) is provided with a plurality of mounting openings, and after the planet column (5) passes through the planet carrier (6) and the planet wheel (4), the planet wheel (4) is fixed at the mounting opening.

3. The planetary reducer with small volume and large reduction ratio according to claim 1, characterized in that: The right side end of the sun gear (3) is provided with a connection hole, and the sun gear support cover (2) is provided with a through hole corresponding to the position of the connection hole.

4. The planetary reducer with small volume and large reduction ratio according to claim 1, characterized in that: A plurality of fixing holes are evenly distributed on the right end surface of the fixed duplex gear (7).

5. The planetary reducer with small volume and large reduction ratio according to claim 1, characterized in that: The left end of the planet carrier (6) is provided with a keyway, in which a flat key (14) is inserted; the left end of the eccentric shaft sleeve (13) is provided with a slot extending inwardly, in which the exposed end of the flat key (14) is inserted.

6. The planetary reducer with small volume and large reduction ratio according to claim 3, characterized in that: The sun gear (3) is sleeved with a bearing, which supports the sun gear support cover (2); the planet carrier (6) is sleeved with a bearing, which supports the fixed duplex gear (7); the left side of the fixed duplex gear (7) is sleeved with a plurality of bearings, which support the eccentric shaft sleeve (13); the right side of the fixed duplex gear (7) is sleeved with a bearing, which supports the end cover (1); the eccentric shaft sleeve (13) is sleeved with a plurality of bearings, which respectively support the housing (11) and the intermediate duplex gear (12).

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