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CN-224214642-U - Planetary reducer with seal

CN224214642UCN 224214642 UCN224214642 UCN 224214642UCN-224214642-U

Abstract

The planetary reducer with the seal comprises a planetary gear II, a pin shaft, a bearing cover, a bearing II, a steel wire retainer II, an output shaft, a screw and a steel ball, wherein the housing is provided with a seal groove I, the bearing cover is provided with the seal groove II, the seal groove I and the seal groove II are respectively used for installing an O-shaped seal ring, and the joint A of the housing and the bearing cover is coated with silicone sealant. The utility model adopts two-stage planetary transmission to realize 7.5:1 high-precision reduction ratio transmission, has small volume, compact structure, can bear 20g of impact vibration, has excellent sealing, long service life, safety, reliability, silence and practicability, and is suitable for popularization.

Inventors

  • ZHOU GAIMEI
  • JIN YONGFENG
  • ZHANG YANJUN
  • ZHU HAILANG
  • ZHANG WEI
  • CHEN JUNLIANG
  • SHI SHAOQING
  • LIU YUANYUAN

Assignees

  • 陕西渭河工模具有限公司

Dates

Publication Date
20260508
Application Date
20250814

Claims (7)

  1. 1. The planetary reducer with the seal is a two-stage planetary transmission and is characterized by comprising an input shaft (1), a steel wire retainer ring I (2), a bearing I (3), a shell (4), a fixed shaft (5), a sleeve (6), a planet wheel I (7) and an inner gear ring (8), wherein the second-stage planetary transmission comprises a planet wheel II (9), a pin shaft (10), a bearing cover (11), a bearing II (12), a steel wire retainer ring II (13), an output shaft (14), a screw (15) and a steel ball (16), a seal groove I (4 a) is arranged on the shell (4), a seal groove II (11 a) is arranged on the bearing cover (11), the seal groove I (4 a) and the seal groove II (11 a) are respectively used for installing an O-shaped seal ring, and a joint A between the shell (4) and the bearing cover (11) is coated with silicone sealant.
  2. 2. The planetary reducer according to claim 1 is characterized in that a power input end of the planetary reducer is an input shaft (1), a power output end of the planetary reducer is an output shaft (14), a sun wheel I and the input shaft (1) are of an integral structure in first-stage planetary transmission, a sun wheel II and an inner gear ring (8) are of a coaxial integral structure in second-stage planetary transmission, the fixed shaft (5) is in interference fit connection with a shell (4) in first-stage planetary transmission, and a planet wheel I (7) is in clearance fit connection with the fixed shaft (5); In the second-stage planetary transmission, the output shaft (14) is in interference fit connection with the pin shaft (10), and the planetary gear II (9) is installed on the pin shaft (10) in a clearance fit manner; In the first-stage planetary transmission, the number of teeth of the inner gear ring (8) is 60, the number of teeth of the sun gear I is 24, the number of teeth of the planet gear I (7) is 18, the number of the planet gears I (7) is 3, the reduction ratio of the first-stage planetary transmission is 2.5, in the second-stage planetary transmission, the number of teeth of the inner gear ring on the shell (4) is 60, the number of teeth of the sun gear II is 30, the number of teeth of the planet gear II (9) is 15, the number of the planet gears II (9) is 3, the reduction ratio of the second-stage planetary transmission is 3, and the total speed ratio of the two-stage planetary transmission is 2.5X3=7.5.
  3. 3. The planetary reducer according to claim 1 or 2, characterized in that the axial length of the planet wheel II (9) is L1, the distance from the axial end face of the planet wheel II to the axial end face of the inner gear ring (8) is M, wherein M is less than or equal to L1/8, the axial length of the planet wheel I (7) is L2, and the clearance between the planet wheel I and the inner side face of the shell (4) is N, wherein N is less than or equal to L2/10.
  4. 4. A planetary reducer according to claim 3, characterized in that the input shaft (1) is provided with a spherical socket I (1 a), the output shaft (14) is provided with a spherical socket II (14 a), a steel ball (16) is installed in a clearance fit between the spherical socket I (1 a) and the spherical socket II (14 a), wherein the radius of the spherical socket I (1 a) and the spherical socket II (14 a) is SR, the clearance between the spherical socket I (1 a) and the spherical socket II (14 a) is L3, the depth of the spherical socket I (1 a) is L4, the depth of the spherical socket II (14 a) is L5, and the diameter of the steel ball (16) is phi m , and the L3+L4+L5 = steel ball is Phi m /2＜SR＜φ m , SR is the radius of spherical socket I or spherical socket II.
  5. 5. The planetary reducer according to claim 4, wherein the bearing I (3) and the bearing II (12) are deep groove ball bearings, the bearing I (3) is a 618/6-ZZ type bearing, and the bearing II (12) is a 618/8-ZZ type bearing.
  6. 6. The planetary reducer according to claim 5, wherein the diameter of the steel ball (16) is 2-2.5 mm, and the steel ball (16) is used for bearing 20g of impact vibration.
  7. 7. The planetary reducer according to claim 6, wherein the installation and positioning position of the bearing I (3) is provided with a steel wire check ring I (2), and the installation and positioning position of the bearing II (12) is provided with a steel wire check ring II (13).

Description

Planetary reducer with seal Technical Field The utility model relates to the technical field of transmission devices, in particular to a design of a small floating planetary reducer with a seal, which is suitable for a mechanical transmission scene with specific requirements on transmission efficiency, volume, bearing capacity, speed ratio, sealing performance and impact resistance. Background The planetary reducer is widely applied in the field of small-speed-ratio transmission due to the remarkable characteristics of high transmission efficiency, small volume, high bearing capacity, wide speed ratio range and the like. Taking the speed reducer of a specific application as an example, the speed reducer needs to achieve a reduction ratio of 7.5:1, and is placed in a limited space with a size of ∅ 42 ×54. Meanwhile, the speed reducer also needs to bear impact vibration of up to 20g, which puts extremely high requirements on the structural strength and stability of the speed reducer. In addition, the decelerator should pass the rain test, meaning that it must have good waterproof sealing property. In the selection of the transmission mode, if two-stage gear transmission is adopted, the problem that input and output cannot be coaxial occurs, and the layout and performance of the whole mechanical system can be affected. Thus, planetary reducer transmissions are a more preferred option. However, if the first-stage planetary reducer is adopted for transmission, it is difficult to design the number of teeth satisfying the assembly relationship requirement that (sun gear number Z s +ring gear number Z r)/planet gear number Z p is an integer. Comprehensively considering, adopting two-stage transmission and developing a 2.5×3 reduction ratio speed matching scheme becomes a necessary choice. Meanwhile, when the design is tried to meet the requirement of the first-stage planetary transmission with the speed ratio of 2.5 in the reduction ratio, according to the requirements of space size and bearing capacity, if the modulus is 0.4, the inner gear ring is fixed, the transmission mode of the planet carrier output is adopted for transmission, the number of teeth Z r of the inner gear ring is 60, the number of teeth of the sun gear is 40, the number of teeth of the planet gear is 10, at the moment, the reduction ratio=1+the number of teeth of the inner gear ring/the number of teeth of the sun gear=2.5, but 4 planet gears are required to be distributed, so that the difficulty of machining and assembling is increased, and the number of teeth of the planet gears is too small, so that the pitting phenomenon is easy to occur, and the bearing capacity and the precision test index are reduced. Therefore, the planet carrier is used for fixing, and the reduction ratio is 2.5 in the mode of outputting the inner gear ring. Disclosure of utility model The utility model solves the technical problem of realizing the design of a two-stage planetary reducer meeting specific requirements by providing a planetary reducer with a seal. The technical scheme includes that the planetary reducer with the seal is a two-stage planetary transmission, the first-stage planetary transmission comprises an input shaft, a steel wire retainer ring I, a bearing I, a shell, a fixed shaft, a sleeve, a planet wheel I and an inner gear ring, the second-stage planetary transmission comprises a planet wheel II, a pin shaft, a bearing cover, a bearing II, a steel wire retainer ring II, an output shaft, a screw and a steel ball, a seal groove I is arranged on the shell, a seal groove II is arranged on the bearing cover, the seal groove I and the seal groove II are respectively used for installing an O-shaped seal ring, and a joint A of the shell and the bearing cover is coated with silicone seal adhesive. According to the technical scheme, the power input end of the planetary reducer is an input shaft, the power output end of the planetary reducer is an output shaft, in first-stage planetary transmission, a sun wheel I and the input shaft are of an integrated structure, in second-stage planetary transmission, a sun wheel II and the inner gear ring are of a coaxial integrated structure, in first-stage planetary transmission, the fixed shaft is in interference fit connection with the shell, the planet wheel I is in clearance fit connection with the fixed shaft, in second-stage planetary transmission, the output shaft is in interference fit connection with the pin shaft, and the planet wheel II is in clearance fit installation on the pin shaft. The first-stage planetary transmission comprises a first-stage planetary transmission body, a second-stage planetary transmission body, a sun gear II, a planet wheel II and a planet wheel I, wherein the number of teeth of the inner gear ring is 60, the number of teeth of the sun gear I is 18, the number of teeth of the planet wheel I is 3, the reduction ratio of the first-stage planetary transmission body is 2.5, the number of t