WO2018028204A1 - Pitch-circle differential speed-reduction device - Google Patents

Abstract

A pitch-circle differential speed-reduction device, comprising: a support housing (1), an input gear (2), a planetary gear set, and an output ring gear (3); the support housing (1) is fixedly provided with a fixed ring gear (4); the planetary gear set comprises: a main planetary gear (5) and a secondary planetary gear (6) coaxially and fixedly connected to the main planetary gear (5); the main planetary gear (5) simultaneously meshes with the input gear (2) and the fixed ring gear (4); the secondary planetary gear (6) meshes with the output ring gear (3); a pitch circle diameter of the output ring gear (3) is larger or smaller than that of the fixed ring gear (4). The pitch-circle differential speed-reduction device has a simple structure, stable operations and a high transmission ratio; said device also has the advantages of having high transmission efficiency, convenient disassembly and assembly, good rigidity and high transmission precision.

Description

 Title of the invention: an indexing circle difference reduction device

 Technical field

 [0001] The present invention relates to the field of reduction transmission technology, and more particularly to an indexing circle difference reduction device.

 Background technique

 [0002] In the current mechanisms for transmitting power and motion, the range of applications of the reducer is quite extensive. It can be seen in almost all kinds of mechanical transmission systems. From large power transmission work to small load, precise angle transmission can be seen in the application of reducer, and in industrial applications, the reducer has Deceleration and increased torque function, therefore widely used in speed and torque conversion equipment, the speed reducer is a power transmission mechanism, it is used in places where high torque is required and does not need too high speed, and With the development of industry and the automation of factories, the demand for the use of reducers is increasing.

 [0003] However, the widely used large speed ratio reducer has complicated structure, unstable operation, small single-stage transmission ratio, large volume, unreliable use, many failures, short life, high noise, inconvenient disassembly and assembly, and inconvenience. Many problems such as maintenance, and in the case of satisfying the large reduction ratio, multi-stage transmission is required, the efficiency is low, the rigidity is poor, the precision is low, the manufacturing process is complicated, and the defects are obvious.

 [0004] For example, the harmonic drive of a harmonic reducer utilizes the elastic deformation controlled by a flexible element to transmit motion and power. The volume is small and the precision is high, but the disadvantage is that the flexible wheel has limited life, is not impact resistant, and has rigidity. Metal parts are relatively poor. The input speed should not be too high, and the general requirement is less than 1500 rpm. The manufacturing process is complicated and the production cost is high.

 [0005] Another example is a planetary reducer, which has the advantages of compact structure, small return clearance, high precision, long service life, and large rated output torque. However, the disadvantage is that the reduction ratio is small, the single-stage deceleration is a minimum of 3, the maximum is generally not more than 10, and the accuracy of each additional stage deceleration is doubled, and the volume is also increased. technical problem

 [0006] The technical problem to be solved by the present invention is to provide an indexing and rounding speed reduction device with simple structure, stable operation, high transmission ratio, small volume and long service life, which has high transmission efficiency, convenient assembly and disassembly, and good rigidity. The advantage of high transmission precision.

Problem solution Technical solution

 [0007] In order to solve the above technical problem, the present invention adopts the following technical solution: An indexing differential gear reduction device includes a support housing, an input gear, a planetary gear set and an output inner ring gear, and the support housing is fixedly fixedly provided An inner ring gear, the planetary gear set includes a main planetary gear and a sub-planetary gear coaxially fixedly coupled to the main planetary gear, the main planetary gear is meshed with the input gear and the fixed inner ring gear, and the sub-planetary gear and the The output inner ring gear is meshed, and the diameter of the index circle of the output inner ring gear is larger or smaller than the diameter of the index circle of the fixed inner ring gear.

 [0008] Preferably, the number of the main planetary gears and the auxiliary planetary gears is one.

 [0009] According to another preferred embodiment, the planetary gear set includes a planetary carrier, two or more main planetary gears, and a sub-planetary gear connected in one-to-one correspondence with the main planetary gears, and two or more main planetary gear rings are evenly distributed on the planet. Bracket

[0010] Preferably, the planetary carrier comprises two single-sided brackets and a pin having the same number as the main planetary gears, and the main planetary gear and the sub-planetary gear are fixedly connected between the two single-sided brackets, and the pin passes through The two ends of the main planetary gear and the sub-planetary gear are respectively fixed to the two single-sided brackets.

 [0011] Preferably, the support housing and the output ring gear are connected by bearings.

 [0012] Preferably, the support housing is connected with an outer ring of the bearing by an interference fit, and the output inner ring gear is connected with the inner ring of the bearing by an interference fit.

 [0013] Preferably, the output inner ring gear is connected with an output cover.

 [0014] Preferably, the input gear is connected with an input shaft, and the main planetary gear and the sub-planetary gear are both spur gears or helical gears.

[0015] Preferably, the main planetary gear and the sub planetary gear are fixedly connected by screws.

 Advantageous effects of the invention

 Beneficial effect

 [0016] The beneficial effects of the present invention are as follows: The present invention provides an indexing circle difference deceleration device, and the indexing circle difference decelerating device of the invention has a simple structure, a stable operation, a large transmission ratio, and a reduction ratio of 5000 or more. Light weight, small size, high precision (within 1 minute), input shaft speed can be 15000 rev / min, volume is 20% of other reducers of the same power, suitable for large reduction ratio occasions and heavy-duty start reducer.

[0017] The speed reducer adopting the above technical solution has the following characteristics compared with the conventional speed reducer: [0018] 1. The single-stage transmission ratio is large, and the input-output shaft is on the same axis, which saves the installation space;

 [0019] 2. The number of parts is small, the transmission precision is higher, the operation is stable, the noise is small, the efficiency is high, and the service life is long.

[0020] 3, convenient assembly and disassembly, simple maintenance;

 [0021] 4, especially suitable for robot arm joints, aerospace and large reduction ratio occasions and occasions requiring precision transmission;

 [0022] 5, small size, large torque, simple structure, low production cost, is a low-energy environmental protection product, can replace all the reducer products on the market.

[0023] In summary, the indexing and rounding speed reduction device of the invention has the advantages of simple structure, stable operation, high transmission ratio, high transmission efficiency, convenient assembly and disassembly, good rigidity and high transmission precision. Gear ratio up to 1: 5000 or more

, the efficiency can reach more than 95%. Small in size and light in weight, it is 50<3⁄4-80% smaller than the traditional gear reducer, reliable in use, low in failure rate, high in creativity and obvious in progress.

 Brief description of the drawing

 DRAWINGS

 1 is a schematic cross-sectional structural view of a first embodiment of the indexing and rounding speed reduction device of the present invention.

2 is a schematic cross-sectional structural view of A-A of FIG. 1.

 3 is a schematic cross-sectional structural view of a second embodiment of the indexing and rounding speed reduction device of the present invention.

4 is a schematic cross-sectional structural view of a third embodiment of the indexing and rounding speed reduction device of the present invention.

 BEST MODE FOR CARRYING OUT THE INVENTION

 BEST MODE FOR CARRYING OUT THE INVENTION

 The present invention will be further described with reference to the embodiments and the accompanying drawings, which are not intended to limit the invention.

 [0029] As shown in FIG. 1 and FIG. 2, a first embodiment of an indexing and rounding speed reduction device includes a support housing 1, an input gear 2, a planetary gear set and an output inner ring gear 3, and the support housing 1 is fixed. A fixed ring gear 4 is provided. The planetary gear set includes a main planetary gear 5 and a sub-planetary gear 6 coaxially fixedly coupled to the main planetary gear 5. The main planetary gear 5 is coupled to the input gear 2 and fixed. The ring gear 4 is meshed, the sub-planetary gear 6 meshes with the output ring gear 3, and the index circle diameter of the output ring gear 3 is larger or smaller than the pitch circle diameter of the fixed ring gear 4.

[0030] In the deceleration transmission process of the indexing circle deceleration device, an electric motor of 1200 rpm is taken as an example, electric The main shaft of the machine is transmitted to the main planetary gear 5 through the input gear 2, and the sub-planetary gear 6 rotates in synchronization with the main planetary gear 5, and transmits the torque to the output ring gear 3, since the sub-planetary gear 6 and the main planetary gear 5 follow the planet The self-propagation of the bracket 7 revolves. If the ratio of the index circle diameter of the fixed ring gear 4 to the output ring gear 3 is 100:9 9, and the ratio of the index circle diameter of the input gear 2 to the main planet gear 5 is 1: 6. The transmission ratio of the input gear 2 and the output inner ring gear 3 of the indexing differential gear reduction device of the present invention is 6x100-99x100, and the transmission ratio is 600, that is, the input shaft 12 with a number of revolutions of 1200 rpm is subjected to the deceleration. After deceleration of the unit, the output shaft rotates at 2 rpm.

 [0031] The indexing round difference deceleration device of the invention has simple structure, stable operation, large transmission ratio, and the reduction ratio can be more than 5000, light weight, small volume, high precision, up to 1 minute, and the input shaft 12 speed can be 15000 rev / min, the volume is 20% of other reducers of the same power, suitable for large reduction ratio occasions and reducer for heavy-duty start.

 [0032] The indexing circular difference reduction device of the invention has the advantages of simple structure, stable operation, high transmission ratio, high transmission efficiency, convenient assembly and disassembly, good rigidity and high transmission precision. The single-stage transmission ratio is 1:5000 or more, and the efficiency can reach 95% or more. Small in size and light in weight, it is 50<3⁄4-80% smaller than the traditional gear reducer. It is reliable in use, low in failure rate, high in creativity and obvious in progress.

 [0033] In the embodiment, the input gear 2 is connected with an input shaft 12, and the main planetary gear 5 and the sub-planetary gear 6 are spur gears or helical gears, and the input shaft 12 may be a main shaft of the motor. It can also be connected with the motor drive through the coupling, which is convenient to use. The spur gear can effectively reduce the processing difficulty and production cost of the reducer. The helical gear can effectively reduce the noise of the reducer, and the operation is more stable. Higher precision.

[0034] In the embodiment, the planetary gear set includes a planetary carrier 7, two main planetary gears 5, and a sub-planetary gear 6 correspondingly connected to the main planetary gear 5, and the two main planetary gears 5 are symmetrically arranged. On the planet carrier 7. Specifically, the planetary carrier 7 includes two single-sided brackets 8 and a pin shaft 9 equal in number to the main planetary gears 5. The main planetary gears 5 and the sub-planetary gears 6 are fixedly connected and are located between the two single-sided brackets 8 . The pin 9 passes through the main planetary gear 5 and the sub-planetary gear 6 and is fixed to the two single-sided brackets 8 respectively. The planetary carrier 7 serves to support the main planetary gear 5 and the sub-planetary gear 6 to prevent the rotational speeds of the two main planetary gears 5 and the sub-planetary gear 6 from being inconsistent and affecting the transmission efficiency of the reducer. In a preferred embodiment, a bearing is arranged between the pin 9 and the main planetary gear 5 and the sub-planetary gear 6 for reducing the friction between the two and reducing the speed reducer. The heat is generated to extend the life of the planetary gear set.

 [0035] Preferably, the support housing 1 and the output inner ring gear 3 are connected by a bearing 10, wherein the support housing 1 is connected with an outer ring of the bearing 10, and the inner ring gear 3 is outputted. The inner ring of the bearing 10 has an interference fit connection. Therefore, the unique degree of freedom of the output inner ring gear 3 is effectively ensured, and the output inner ring gear 3 is prevented from being detached from the speed reducer, and the overall performance of the reducer is better.

 [0036] In the embodiment, the output inner ring gear 3 is connected with the output cover body 11. When the reducer of the present invention is used for the upper jaw of the robot, the lower first mechanical arm or the mechanical claw can be directly fixed to the output cover. On the body 11, the utility and extensiveness of the reducer are further enhanced. Embodiments of the invention

 [0037] FIG. 3 shows a second embodiment of the indexing-difference gear reduction device, which is different from the first embodiment in that: the main planetary gear 5 and the sub-planetary gear 6 are fixedly connected by screws 13, The processing difficulty and disassembly and assembly difficulty of the planetary wheel set are further reduced, and maintenance and overhaul are more convenient.

 [0038] In the embodiment, the output inner ring gear 3 is connected with an output cover body 11. The output cover body 11 is connected with an output shaft connection for mounting a pulley or a coupling, and is convenient to assemble.

 [0039] FIG. 4 shows a third embodiment of the indexing-difference gear reduction device, which is different from the above-described second embodiment in that: the number of the main planetary gear 5 and the sub-planetary gear 6 is one, The structure is simpler, the manufacturing cost is lower, and it is more suitable for the toy field where the transmission torque is not large and the precision is not high.

 Industrial applicability

 [0040] The speed reducer adopting the above technical solution has the following characteristics compared with the conventional speed reducer:

 [0041] 1. The single-stage transmission ratio is large, and the input and output shafts are on the same axis, which saves the installation space;

 [0042] 2. The number of parts is small, the transmission precision is higher, the operation is stable, the noise is small, the efficiency is high, and the service life is long.

[0043] 3, convenient assembly and disassembly, simple maintenance;

 [0044] 4, especially suitable for robot arm joints, aerospace and large reduction ratio occasions and occasions requiring precision transmission;

 [0045] 5, small size, large torque, simple structure, low production cost, is a low-energy environmentally friendly product, can replace all the reducer products on the market.

Claims

 Claim An indexing differential gear reduction device comprises a support housing (1), an input gear (2), a planetary gear set and an output inner ring gear (3), and the support housing (1) is fixedly provided with a fixed inner ring gear ( 4), characterized in that: the planetary gear set includes a main planetary gear (5) and a sub-planetary gear (6) coaxially fixedly coupled to the main planetary gear (5), the main planetary gear (5) is the same as the The input gear (2) meshes with the fixed ring gear (4), the sub-planetary gear (6) meshes with the output ring gear (3), and the output circle ring (3) has an index circle diameter larger or smaller than the solid The diameter of the index circle of the inner ring gear (4). The indexing-difference gear reduction device according to claim 1, wherein the number of the main planetary gear (5) and the sub-plane gear (6) is one. The indexing differential gear reduction device according to claim 1, wherein: the planetary gear set includes a planetary carrier (7), two or more main planetary gears (5), and a main planetary gear. (5) One-to-one connected sub-planetary gears (6), two or more main planetary gears (5) are annularly distributed on the planet carrier (7). The indexing gear reduction device according to claim 3, characterized in that: the planet carrier (7) comprises two single-sided brackets (8) and a pin (9) equal in number to the main planetary gears (5) The main planetary gear (5) and the sub planetary gear (6) are fixedly connected between the two single-sided brackets (8), and the pin (9) passes through the main planetary gear (5) and the sub-planetary gear (6) The two ends are then fixed to the two single-sided brackets (8). The indexing gear reduction device according to claim 1, wherein the support housing (1) and the output ring gear (3) are connected by a bearing (10). The indexing gear reduction device according to claim 5, characterized in that: the support shell (1) is connected with an outer ring of the bearing (10), and the inner ring gear (3) and the bearing are output. (10) The inner ring is fitted with an interference fit. The indexing-difference gear reduction device according to claim 1, wherein the output inner ring gear (3) is connected to an output cover (11). The indexing gear reduction device according to claim 4, wherein: said input gear (2) is connected to an input shaft (12), a main planetary gear (5) and a sub-plane gear (6). All are spur gears or helical gears with bearings between the pin (9) and the main planetary gear (5) and the sub planetary gear (6). [Equation 9] The indexing and rounding speed reduction device according to claim 1, wherein the main planetary gear (5) and the sub planetary gear (6) are fixedly connected by a screw (13).