TWI818453B - Reducer transmission system - Google Patents

Abstract

A transmission system of a reducer includes a planetary arm frame and a planetary gear unit. The planetary arm frame includes a main body and several planetary shaft units pivoted on the main body. The rack body has a first wall surface and a second wall surface that are opposite. The planetary gear unit includes a sun gear and a planetary gear set. The sun gear is adjacent to the first wall. The planetary gear set has a plurality of first gears adjacent to the first wall surface and respectively nested in the planetary shaft units and meshed with the sun gear, and a plurality of second wall surfaces adjacent to the first gears and coaxial with the first gears. Second gears are provided, and a ring gear meshes with the second gears. By disposing the first gears and the second gears on opposite sides of the frame body, mutual interference during rotation can be avoided and the overall volume can be reduced.

Description

Reducer transmission system

The present invention relates to a reducer, and in particular to a transmission system of the reducer.

Referring to Figures 1 to 3, a transmission system 1 of an existing reducer is shown. The reducer also includes a casing (not shown) and a support shaft (not shown) extending through the casing along an axis L. And a motor rotor (not shown) located in the casing and capable of being driven to rotate around the support shaft. The transmission system 1 of the existing reducer is located in the casing and includes a set of devices and fixed connections. The planetary arm bracket 11 that supports the shaft, a sun gear 12 that is rotatably sleeved on the support shaft and connected to the motor rotor to be driven by the motor rotor to rotate around the axis L, and a sun gear 12 that abuts the planetary arm. abutting member 13 between the carrier 11 and the sun gear 12, and a planetary gear set 14 pivoted on the planetary arm carrier 11 and connected to the casing. The planetary arm carrier 11 has a carrier body 111 that is set and fixed to the support shaft and for the sun gear 12 to be rotatably disposed, and three first planets that are spaced apart around the axis L and are disposed on the carrier body 111. The shaft 112 and three second planetary shafts 113 are spaced around the axis L and are arranged on the frame body 111 and are respectively located between any two first planetary shafts 112 . The first planetary shafts 112 are relatively adjacent to the sun gear 12 , and the second planetary shafts 113 are relatively far away from the sun gear 12 . The planetary gear set 14 has three first gears 141 respectively pivoted on the first planetary shafts 112 and adjacent to the carrier body 111 and meshed with the sun gear 12 , and three first gears 141 respectively pivoted on the first planetary shafts 112 . The shaft 112 is respectively located on a side of the first gears 141 away from the frame body 111 and is coaxially arranged with the corresponding first gear 141. Three second gears 142 are respectively pivoted on the second planetary shafts. The rods 113 are respectively engaged with the third gears 143 of the second gears 142, and three are respectively pivoted on the second planetary shafts 113 and are respectively located on one side of the third gears 143 adjacent to the frame body 111. A fourth gear 144 is coaxially arranged with the corresponding third gear 143, and a ring gear 145 is meshed with the fourth gears 144 and connected to the casing to rotate the casing. The motor rotor drives the sun gear 12 to rotate around the axis. The sun gear 12 drives the first gears 141 to rotate. When the first gears 141 rotate, the second gears 142 rotate coaxially. The second gears 142 The third gears 143 are then driven to rotate respectively. When the third gears 143 rotate, the fourth gears 144 rotate coaxially. The fourth gears 144 then drive the ring gear 145 to rotate, and the ring gear 145 interlocks to make the ring gear 145 rotate. The casing rotates.

However, when the first gears 141 and the fourth gears 144 adjacent to the rack body 111 rotate, in order to avoid interference with the rack body 111, there must be a gap between each first gear 141 and the rack body 111. A gap D1 is maintained, and a gap D2 must be maintained between each fourth gear 144 and the frame body 111 . In order to avoid interference with the sun gear 12 when the second gears 142 rotate, a gap D3 must be maintained between each second gear 142 and the sun gear 12 . In order to avoid interference with the third gears 143 when the first gears 141 rotate, a gap D4 must be maintained between each third gear 143 and the corresponding first gear 141 . In order to avoid interference with the ring gear 145 when the third gears 143 rotate, a gap D5 must be maintained between each third gear 143 and the ring gear 145 . Retaining the above gap will cause the required length of the first planetary shafts 112 and the second planetary shafts 113 to increase, and as the length of the first planetary shafts 112 and the second planetary shafts 113 As the length of the planetary gear set 14 increases, the shaking and deflection of the planetary gear set 14 will also increase. Therefore, more safety distances must be reserved to make the entire transmission system 1 of the existing reducer longer along the axis L. Long, the casing requires a larger accommodation space, resulting in a larger overall volume of the reducer.

Therefore, an object of the present invention is to provide a transmission system of a reducer that can overcome the shortcomings of the prior art.

Therefore, the transmission system of the reducer of the present invention includes a planetary arm carrier and a planetary gear unit. The planetary arm carrier includes a carrier body arranged around an axis, and a plurality of planetary shaft units penetrating through and pivoting on the carrier body along an axial direction parallel to the axis. The frame body has a first wall surface and a second wall surface opposite to each other along the axis. The planetary gear unit includes a sun gear and a planetary gear set. The sun gear can rotate around the axis and is adjacent to the first wall. The planetary gear set has a plurality of first gears adjacent to the first wall surface and respectively nested and connected to the planetary shaft units and meshed with the sun gear, and a plurality of adjacent second wall surfaces and respectively nested and connected to the sun gear. The second gears are planetary shaft units and are respectively arranged coaxially with the first gears, and a ring gear surrounds the axis and meshes with the second gears. Each first gear rotates coaxially with the corresponding second gear, and the second gears drive the ring gear to rotate.

The effect of the present invention is that by disposing the first gears and the second gears on opposite sides of the frame body along the axial direction, the gap between the first gears and the second gears can be avoided. Interference with each other, and only gaps must be left between the first gears and the frame body, and between the second gears and the frame body, so that the required length of the planetary shafts along the axis direction is greatly reduced, so the The overall volume of the transmission system of the reducer is small, and the shaking and deflection generated during the operation of the planetary gear unit can also be greatly reduced.

Referring to Figures 4 and 5, an embodiment of the transmission system of the reducer of the present invention is shown. The reducer also includes a support shaft (not shown) extending along an axis L1, and a support shaft for the support shaft to pass through and can A casing (not shown) that rotates relative to the support shaft, and a motor rotor (not shown) that is located in the casing and can be driven to rotate relative to the support shaft. The transmission system of the reducer of the present invention is located in the casing and includes a planetary arm carrier 2 and a planetary gear unit 3.

Referring to Figures 5 to 7, the planetary arm frame 2 includes an annular frame body 21 arranged around the axis L1, and three penetrating and pivoting frames 21 along an axial direction X parallel to the axis L1. The planetary shaft unit 22 , a one-way bearing ring 23 fixed to the inner circumferential surface of the frame body 21 , and a sleeve 24 abutting the inner circumferential surface of the one-way bearing ring 23 and sleeved on the support shaft.

Referring to FIGS. 6 to 9 , the rack body 21 has a first wall 211 and a second wall 212 that are opposite along the axis L1 , and three holes penetrating the first wall 211 and the second wall 212 along the axis direction X. Embedding holes 213 for the planetary shaft units 22 to pass through are provided at equal intervals around the axis L1, and three annular ribs 214 respectively protrude into the embedding holes 213. The planetary shaft units 22 are respectively inserted into the inserting holes 213 along the axial direction X, and each planetary shaft unit 22 has a planetary shaft rod 221 extending through the respective inserting hole 213 along the axial direction X. And two sets of planetary bearings 222 are placed on the planetary shaft 221 and embedded in the embedding hole 213. The planetary bearings 222 can enable the planetary shaft 221 to rotate smoothly in the embedded hole 213. It is worth mentioning that the number of planetary bearings 222 of each planetary shaft unit 22 can only be one, so that the planetary shaft can rotate smoothly. 221 rotates smoothly in the embedded hole 213, so it is not limited to this embodiment. Each annular rib 214 is used to separate the planet bearings 222 located in the respective embedded holes 213 to prevent the planet bearings 222 from abutting each other and causing wear. Each planet shaft 221 has a D-shaped limiting portion 223 (see FIG. 7 ) at one end adjacent to the first wall 211 along the axis direction A buckle 224 at one end of the wall 211.

The planetary gear unit 3 includes a sun gear 31 and a planetary gear set 32 . The sun gear 31 is placed on the support shaft and driven by the motor rotor to rotate relative to the support shaft and adjacent to the first wall 211 . The planetary gear set 32 has three first gears 321 adjacent to the first wall 211 and respectively disposed on the planetary shafts 221 and meshed with the sun gear 31 , and three adjacent second walls 212 and respectively disposed. A second gear 322 is provided on the planetary shafts 221 and coaxially with the first gears 321 , and a second gear 322 that surrounds the axis L1 and meshes with the second gears 322 and is connected to the casing to link the casing relative to the casing. The ring gear 323 supports the rotation of the shaft. In order to avoid interference between the first gears 321 and the rack body 21 , a gap d1 is reserved between each first gear 321 and the first wall surface 211 of the rack body 21 . In order to avoid interference between the second gears 322 and the rack body 21 , a gap d2 is reserved between each second gear 322 and the second wall surface 212 of the rack body 21 . Each first gear 321 has a D-shaped limiting hole 324 corresponding to the limiting portion 223 of the individual planetary shaft 221 , and the limiting portion 223 of the planetary shaft 221 can pass through the limiting hole 324 . The first gear 321 and the planet shaft 221 are fixedly connected through the position hole 324 and through the respective buckle 224 . Each second gear 322 is over-molded on an end of the respective planetary shaft 221 opposite to the first gear 321 to be fixed to the planetary shaft 221 . It is worth noting that the second gears 322 can also be fixed to the planetary shafts 221 by the structural limiting method of the first gears 321 being fixed to the planetary shafts 221 , so it is not necessary. It is limited to this embodiment.

The operation process of the transmission system of the reducer of the present invention is as follows. The motor rotor is driven to drive the sun gear 31 to rotate relative to the support shaft. The sun gear 31 drives the first gears 321 to rotate, and the first gears 321 rotate. When the second gears 322 rotate coaxially through the planetary shafts 221, the second gears 322 drive the ring gear 323 to rotate, and the ring gear 323 then drives the casing to rotate relative to the support shaft. Complete the transmission of power.

To sum up, in the transmission system of the reducer of the present invention, by disposing the first gears 321 and the second gears 322 respectively on opposite sides of the frame body 21 along the axis direction Interference between the gear 321 and the second gears 322 can be avoided, and compared with the existing transmission system 1 of the reducer that requires a gap between multiple gears, the present invention only requires a gap between each first gear. The gap d1 remains between 321 and the first wall 211, and the gap d2 remains between each second gear 322 and the second wall 212. Therefore, the required movement of the planetary shafts 221 along the axial direction X The length can be greatly reduced, making the overall volume of the present invention smaller, which is beneficial to space utilization in the casing, and can reduce the shaking and deflection generated when the planetary gear unit 3 is operating, so the purpose of the present invention can indeed be achieved.

However, the above are only examples of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made based on the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. within the scope covered by the patent of this invention.

2:Planetary arm 21: Frame body 211:First wall 212:Second wall 213: embedded hole 214: Ring type convex rib 22:Planetary axis unit 221:Planetary shaft 222:Planetary bearing 223: Limiting part 224:Buckle 23: One-way bearing ring 24: Shaft sleeve 3: Planetary gear unit 31:Sun gear 32:Planetary gear set 321:First gear 322: Second gear 323:Ring gear 324: Limit hole L1: axis X: axis direction Gap:d1 Gap:d2

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view of the transmission system of an existing reducer; Figure 2 is another perspective view of the transmission system of the existing reducer; Figure 3 is a cross-sectional view of the transmission system of the existing reducer; Figure 4 is a perspective assembly view of an embodiment of the transmission system of the reducer of the present invention; Figure 5 is another perspective assembly view of this embodiment; Figure 6 is an exploded perspective view of this embodiment; Figure 7 is another perspective exploded view of this embodiment; Figure 8 is a perspective cross-sectional view of this embodiment; and Figure 9 is a side cross-sectional view of this embodiment.

2:Planetary arm 21: Frame body 212:Second wall 23: One-way bearing ring 24: Shaft sleeve 3: Planetary gear unit 32:Planetary gear set 321:First gear 322: Second gear 323:Ring gear L1: axis X: axis direction

Claims (4)

A transmission system of a reducer, including: a planetary arm frame, including a frame body arranged around an axis, and several planetary shaft units penetrating and pivoting on the frame body along an axial direction parallel to the axis, the frame The body has a first wall surface and a second wall surface that are opposite along the axis, a plurality of embedded holes that penetrate the first wall surface and the second wall surface along the axial direction and are respectively used for the planetary shaft units to pass through, and several embedded holes. There are annular ribs respectively protruding in the embedded holes. Each planetary shaft unit has a planetary shaft extending through the individual embedded holes in the axial direction, and two sets of planetary shafts are placed on the planetary shafts and embedded in the holes. Planetary bearings located in individual insert holes, each annular rib serving to separate the planet bearings located in individual insert holes; and a planetary gear unit, including a sun gear, rotatable about the axis Rotating and adjacent to the first wall, and a planetary gear set having a plurality of first gears adjacent to the first wall and respectively sleeved and connected to the planetary shafts and meshed with the sun gear, and several adjacent first gears. The second wall surface is respectively sleeved with second gears connected to the planetary shafts and coaxially arranged with the first gears, and a ring gear surrounding the axis and meshing with the second gears; wherein, each Two opposite ends of a planetary shaft along the axial direction are respectively used to connect the respective first gears and the respective second gears. Each first gear rotates coaxially with the corresponding second gear. The third gears rotate coaxially. The two gears drive the ring gear to rotate. The transmission system of the reducer as described in claim 1, wherein the planetary shafts The units are arranged on the frame body at equal intervals around the axis. The transmission system of the reducer as claimed in claim 1, wherein each second gear is over-injection molded on the planetary shaft of the respective planetary shaft unit, and each planetary shaft is connected to one end of the first gear. It has a D-shaped limiting portion, and each first gear has a D-shaped limiting hole corresponding to the limiting portion of the individual planet shaft. The transmission system of the reducer according to claim 1, wherein the frame body is annular, and the planetary arm frame also includes a one-way bearing ring connected to the inner circumferential surface of the frame body, and a bearing ring abutting against the inner circumferential surface of the frame body. The sleeve on the inner circumference of the one-way bearing ring.

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