Lightweight speed reducer for small steering engine

Abstract

The lightweight speed reducer for the small steering engine is characterized in that an input worm is rotationally supported and mounted in a worm mounting hole in a rear box body, and one end of the input worm extends out of the worm mounting hole to form a power input end; the rear end part of the worm-wheel shaft is rotatably supported on the rear box body, and the front end part of the worm-wheel shaft is rotatably supported on the output gear shaft; the output gear shaft is rotatably supported and matched with the front box body; the worm gear is coaxially fixed on the worm gear mounting part of the worm gear shaft, and the worm gear is meshed with worm teeth; the planetary gear is matched with the eccentric outer circle part of the worm wheel shaft in a rotary supporting manner; inner teeth on the inner ring of the planetary gear are meshed with outer teeth on the outer circle of the output gear shaft; an inner gear ring is fixedly arranged in a transmission part mounting hole in the rear part of the front box body; teeth on an inner ring of the inner gear ring are meshed with outer teeth on an outer ring of the planet wheel outer ring; the number of teeth on the inner gear ring is larger than the number of teeth on the outer ring of the planetary gear, and the number of teeth on the inner ring of the planetary gear is larger than the number of teeth on the outer ring of the output gear shaft. The invention has the advantages of few transmission components, light weight and compact structure.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment transmission, and particularly relates to a lightweight reducer for a small steering gear. Background Art

[0002] A servo is a servo device capable of controlling angles. Composed primarily of a motor and a reducer, it's suitable for control systems that require constant and stable angle changes. Due to the high speeds of small motors, existing servo reducers often require multiple gear stages, resulting in complex structures and high forces, leading to high costs and poor positioning accuracy. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a lightweight reducer for a small steering gear, which has few transmission components, high positioning accuracy, light weight and compact structure.

[0004] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0005] A lightweight reducer for a small steering gear, comprising a rear housing, a front housing, an input worm, a worm shaft, a worm wheel, a planetary gear, an inner gear ring, and an output gear shaft;

[0006] The rear housing is provided with a worm mounting hole and a worm wheel mounting hole. The worm wheel mounting hole is arranged in the center of the rear housing along the front and rear sides. The worm mounting hole and the worm wheel mounting hole are arranged vertically and staggered and are connected. A bearing mounting hole is coaxially provided on the rear end of the worm wheel mounting cavity on the rear housing.

[0007] The front box body is provided with a center hole, which is composed of a bearing mounting hole located at the front and a transmission member mounting hole located at the rear; the rear end of the front box body contacts the front end of the rear box body and is fixedly connected by screws to form an integral box body, and the center hole on the front box body and the worm gear mounting hole on the rear box body are coaxially arranged front to back;

[0008] The front and rear ends of the worm gear shaft are bearing mounting ends. A worm gear mounting portion is provided on the worm gear shaft near the rear bearing mounting end, and an eccentric outer circle portion is provided on the worm gear shaft near the front bearing mounting end. The output gear shaft is a hollow gear shaft with external teeth provided on the rear part of the outer circle. The front part of its outer circle is the bearing mounting portion, and the rear part of its inner hole is the bearing mounting portion. The outer ring and the front part of the inner ring of the planetary gear are respectively provided with external teeth and internal teeth, and the rear part of the inner ring of the planetary gear is the bearing mounting portion.

[0009] The worm is rotatably supported by a bearing and mounted in a worm mounting hole on the rear housing, with one end extending from the worm mounting hole to form a power input end;

[0010] The rear end bearing mounting end of the worm gear shaft is rotatably supported by the bearing mounting hole on the rear housing through a bearing, and the front end bearing mounting end of the worm gear shaft is rotatably supported by the bearing mounting portion on the output gear shaft through a bearing; the front bearing mounting portion of the outer ring of the output gear shaft is rotatably supported by the bearing mounting hole on the front housing through a bearing.

[0011] The worm wheel is coaxially fixed to the worm wheel mounting portion of the worm wheel shaft, and the worm wheel is meshed with the worm gear teeth;

[0012] The planetary gear forms a rotational support cooperation with the eccentric outer circle of the worm gear shaft through the bearing installed in the bearing mounting hole at the rear thereof, and the internal teeth on the inner ring of the planetary gear and the external teeth on the outer circle of the output gear shaft form a tooth meshing; the inner gear ring is fixedly installed in the rear transmission component mounting hole on the front box body, and the teeth on the inner ring of the inner gear ring form a tooth meshing with the external teeth on the outer ring of the planetary gear; the number of teeth on the inner gear ring is greater than the number of teeth on the outer ring of the planetary gear, forming a small differential gear mechanism, and the number of teeth on the inner ring of the planetary gear is greater than the number of teeth on the outer ring of the output gear shaft, forming a small differential gear mechanism.

[0013] The advantages and positive effects of the present invention are:

[0014] 1. The reducer of the present invention adopts a combination of a first-stage worm gear transmission and a first-stage planetary transmission, and the first-stage planetary transmission adopts a two-stage small-difference tooth meshing mechanism consisting of the meshing of the planetary gear and the internal gear ring, and the meshing of the planetary gear and the output gear shaft, so that the reducer of the present invention achieves a large transmission ratio and greatly reduces the number of transmission parts, with the advantages of light weight, compact structure and low cost.

[0015] 2. Compared with the traditional servo structure, the present invention has fewer transmission stages under the same speed ratio, and the single-stage planetary gear meshing overlap is high, so the backlash is small and the transmission accuracy is high; the internal rolling bearing support is used instead of the traditional sliding bearing support to improve the rotational rigidity of the output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded perspective view of the present invention;

[0017] Figure 2 is a two-dimensional cross-sectional view of the present invention;

[0018] Figure 3 is a cross-sectional view of the planetary gear meshing portion of the present invention;

[0019] Figure 4 It is a three-dimensional appearance diagram of the present invention. DETAILED DESCRIPTION

[0020] The structure of the present invention will be further described below with reference to the accompanying drawings and through examples. It should be noted that the present examples are descriptive rather than restrictive.

[0021] A lightweight reducer for small servos, see Figure 1-Figure 4 The invention point is: it mainly includes a rear box body 13, a front box body 2, an input worm 12, a worm gear shaft 9, a worm wheel 10, a planetary gear 5, an inner ring 8, an output gear shaft 4, multiple bearings, a pressure ring 14 and a connecting screw 1.

[0022] The rear housing is provided with a worm mounting hole and a worm wheel mounting hole. The worm wheel mounting hole is arranged in the center of the rear housing along the front-to-back direction. The worm mounting hole and the worm wheel mounting hole are arranged vertically and staggered and are connected. A bearing mounting hole is coaxially provided on the rear housing at the rear end of the worm wheel mounting hole. The diameter of the bearing mounting hole is smaller than that of the worm wheel mounting hole. A step is provided near the rear end of the bearing mounting hole to axially limit the bearing installed in this position.

[0023] The front housing is provided with a center hole, which is composed of a bearing mounting hole at the front and a transmission component mounting hole at the rear. The rear end of the front housing contacts the front end of the rear housing, and the two are fixedly connected by connecting screws 1 to form an integrated housing. The center hole on the front housing and the worm gear mounting hole on the rear housing are coaxially arranged front to back.

[0024] The front and rear ends of the worm gear shaft serve as bearing mountings. A worm gear mounting portion is located near the rear bearing mounting end of the worm gear shaft, and an eccentric outer circumference portion is located near the front bearing mounting end. The output gear shaft is a hollow gear shaft, with external teeth located at the rear of its outer circumference, a bearing mounting portion located at the front of its outer circumference, and a bearing mounting portion located at the rear of its inner bore. The outer and inner rings of the planetary gears are provided with external and internal teeth, respectively. The rear of the inner ring of the planetary gear serves as the bearing mounting portion. The aperture of this bearing mounting portion is larger than the aperture of the internal teeth on the inner ring of the planetary gear to ensure axial positioning of the bearing installed there.

[0025] The worm is rotatably supported by a bearing 11 and mounted in a worm mounting hole on the rear housing, with one end extending from the worm mounting hole to form the power input end of the reducer. The bearing supporting the worm is axially limited by a pressure ring 14.

[0026] The rear end bearing mounting end of the worm gear shaft is rotatably supported by the bearing mounting hole on the rear housing via bearing 15. The front end bearing mounting end of the worm gear shaft is rotatably supported by the bearing mounting portion on the output gear shaft via bearing 6. The front bearing mounting portion of the outer ring of the output gear shaft is rotatably supported by the front bearing mounting hole on the front housing via bearing 3.

[0027] The worm wheel is sleeved on the worm wheel mounting portion of the worm wheel shaft and is coaxially fixedly connected to the worm wheel shaft, specifically by a spline connection and a radial top screw, etc. The worm wheel meshes with the worm teeth to transmit power to the worm wheel shaft.

[0028] The planetary gears are rotationally supported by bearings 7 mounted in the bearing mounting holes at their rear ends, and the eccentric outer circumference of the worm gear shaft forms a meshing connection. The internal teeth on the inner ring of the planetary gears mesh with the external teeth on the outer circumference of the output gear shaft. The inner ring gear is fixedly mounted in the rear transmission component mounting hole on the front housing via screws or other means, and the teeth on the inner ring of the inner ring gear mesh with the external teeth on the outer ring of the planetary gears. The number of teeth on the inner ring gear is greater than the number of teeth on the outer ring of the planetary gears, forming a small-gear differential mechanism. The number of teeth on the inner ring of the planetary gears is greater than the number of teeth on the outer ring of the output gear shaft, forming a small-gear differential mechanism.

[0029] The bearings in all the above locations are rolling bearings.

[0030] The proportional relationship between the teeth on the inner gear ring, the teeth on the outer circle of the planetary gear, the teeth on the inner circle of the planetary gear, and the teeth on the output gear shaft is specifically configured according to the actual transmission ratio requirements.

[0031] The working principle of this lightweight reducer for small servo is:

[0032] This small servo uses a lightweight reducer. Power is input through the input worm. The worm meshes with the worm wheel to transmit motion to the worm wheel shaft. The worm wheel shaft rotates to drive the planetary gear. The outer teeth of the planetary gear mesh with the ring gear, and the inner teeth mesh with the teeth of the output gear shaft. Since the ring gear is fixed, the planetary gear drives the output gear shaft to rotate. The output gear shaft serves as the output mechanism of the reducer to realize motion output.

[0033] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various replacements, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A lightweight reducer for a small steering gear, characterized in that: It includes a rear box body, a front box body, an input worm, a worm gear shaft, a worm wheel, a planetary gear, an inner gear ring, and an output gear shaft; The rear box body is provided with a worm mounting hole and a worm wheel mounting hole, the worm wheel mounting hole is arranged at the center of the rear box body along the front and rear, the worm mounting hole and the worm wheel mounting hole are arranged vertically and staggered and connected; a bearing mounting hole is coaxially arranged at the rear end of the worm wheel mounting cavity on the rear box body; The front box body is provided with a center hole, and the center hole is composed of a bearing mounting hole located at the front and a transmission member mounting hole located at the rear; the rear end of the front box body contacts the front end of the rear box body and is fixedly connected by screws to form an integral box body, and the center hole on the front box body and the worm gear mounting hole on the rear box body are coaxially arranged front and back; The front and rear ends of the worm shaft are bearing mounting ends, a worm wheel mounting portion is provided on the worm shaft near the rear bearing mounting end, and an eccentric outer circle portion is provided on the worm shaft near the front bearing mounting end; the output gear shaft is a hollow gear shaft with external teeth provided at the rear of the outer circle, the front of the outer circle is the bearing mounting portion, and the rear of the inner hole is the bearing mounting portion; the outer ring and the front of the inner ring of the planetary gear are provided with external teeth and internal teeth respectively, and the rear of the inner ring of the planetary gear is the bearing mounting portion; The worm is rotatably supported by a bearing and installed in a worm mounting hole on the rear housing, and one end of the worm extends out of the worm mounting hole to form a power input end; The rear end bearing mounting end of the worm gear shaft is rotatably supported by the bearing mounting hole on the rear housing through the bearing, and the front end bearing mounting end of the worm gear shaft is rotatably supported by the bearing mounting portion on the output gear shaft through the bearing; the outer ring front bearing mounting portion of the output gear shaft is rotatably supported by the bearing and the front bearing mounting hole on the front housing through the bearing; The worm wheel is coaxially fixed to the worm wheel mounting portion of the worm wheel shaft, and the worm wheel is meshed with the worm gear teeth; The planetary gear forms a rotational support cooperation with the eccentric outer circle of the worm gear shaft through the bearing installed in the bearing installation hole at the rear thereof, and the internal teeth on the inner ring of the planetary gear form a tooth meshing with the external teeth on the outer circle of the output gear shaft; the inner gear ring is fixedly installed in the rear transmission part installation hole on the front box body, and the teeth on the inner ring of the inner gear ring form a tooth meshing with the external teeth on the outer ring of the planetary wheel; the number of teeth on the inner gear ring is greater than the number of teeth on the outer ring of the planetary gear, forming a small-difference tooth mechanism, and the number of teeth on the inner ring of the planetary gear is greater than the number of teeth on the outer ring of the output gear shaft, forming a small-difference tooth mechanism.

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