US-12617451-B2 - Oil-immersed steering gear

US12617451B2US 12617451 B2US12617451 B2US 12617451B2US-12617451-B2

Abstract

The present invention belongs to the technical field of steering gears, and specifically discloses an oil-immersed steering gear, including a shell assembly, where a control chamber and an oil immersion chamber are separated in the shell assembly. According to the oil-immersed steering gear of the present invention, the gear transmission assembly is immersed in the liquid gear oil in the oil immersion chamber, so that fluid lubrication conditions can be maintained in a meshing area of the gear transmission assembly for a long time, thereby preventing gear wear, ensuring stable output speed, and prolonging the service life of the steering gear. Even if the steering gear is used for a long time, no noise will be made.

Inventors

Wei Li

Assignees

Jiangxi Jizhun Technology Co., Ltd.

Dates

Publication Date: 20260505
Application Date: 20230517
Priority Date: 20230307

Claims (9)

1 . An oil-immersed steering gear, comprising a shell assembly, wherein a control chamber and an oil immersion chamber are separated in the shell assembly, liquid gear oil is filled in the oil immersion chamber, a control board is accommodated in the control chamber, a motor and a potentiometer are arranged on the control board, an output end of the motor is connected to an output gear shaft of the potentiometer through a gear transmission assembly in a transmission manner, the gear transmission assembly is located in the oil immersion chamber and immersed in the liquid gear oil, and the output gear shaft rotates to pass through the oil immersion chamber and extend outside the shell assembly, wherein a side surface of the shell assembly is provided with an oil outlet hole, which communicates with the oil immersion chamber, and a transparent oil cap is covered on the oil outlet hole in a sealing manner.
2 . The oil-immersed steering gear according to claim 1 , wherein an output end surface of the shell assembly is provided with an oil injection hole, which communicates with the oil immersion chamber, and a hole sealing screw is screwed in the oil injection hole in a sealing manner.
3 . The oil-immersed steering gear according to claim 1 , wherein the oil immersion chamber and the control chamber are separated in a column, the shell assembly comprises an upper cover, a middle shell and a bottom cover, the upper cover is covered on the top of the middle shell in a sealing manner to form the oil immersion chamber, and the bottom cover is covered on the bottom of the middle shell in a sealing manner to form the control chamber.
4 . The oil-immersed steering gear according to claim 1 , wherein the motor is located in the control chamber, the output end of the motor is provided with an input gear shaft, and the input gear shaft and the motor are both connected to the shell assembly in a sealing manner.
5 . The oil-immersed steering gear according to claim 4 , wherein an end surface of the motor is connected to the shell assembly in a sealing manner through a motor sealing ring, and the outside of the input gear shaft is connected to the shell assembly in a sealing manner through a motor oil seal.
6 . The oil-immersed steering gear according to claim 4 , wherein the gear transmission assembly comprises a one-stage helical gear, a two-stage helical gear set, a three-stage helical gear set, a four-stage helical gear set, and a five-stage helical gear; the one-stage helical gear is located on the input gear shaft, the five-stage helical gear is located on the output gear shaft, and the one-stage helical gear is connected in a transmission manner to the five-stage helical gear through the two-stage helical gear set, the three-stage helical gear set, and the four-stage helical gear set in turn.
7 . The oil-immersed steering gear according to claim 6 , wherein a two and four-stage gear shaft is arranged between the output gear shaft and the input gear shaft, the two and four-stage gear shaft is located in the oil immersion chamber and both ends of the two and four-stage gear shaft are rotatably connected to the shell assembly respectively through first bearings, and the two-stage helical gear set and the four-stage helical gear set are both located on the two and four-stage gear shaft.
8 . The oil-immersed steering gear according to claim 6 , wherein a positioning part is protruded on the bottom of the oil immersion chamber, the one-stage helical gear is located in the positioning part and helical teeth of the one-stage helical gear are exposed in the positioning part, the three-stage helical gear set is arranged on a three-stage gear shaft which is disposed coaxially with the positioning part, one end of the three-stage gear shaft is rotatably connected to the shell assembly through a third bearing, and the other end of the three-stage gear shaft is sleeved outside the positioning part and rotatably connected to the positioning part through the other third bearing.
9 . The oil-immersed steering gear according to claim 1 , wherein the potentiometer is located in the control chamber, both ends of the output gear shaft are rotatably connected to the shell assembly respectively through fourth bearings, and both ends of the output gear shaft are connected to the shell assembly in a sealing manner respectively through output gear shaft oil seals.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The application claims priority to Chinese patent application No. 202310209861.X, filed on Mar. 7, 2023, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present invention belongs to the technical field of steering gears, and in particular relates to an oil-immersed steering gear. BACKGROUND A steering gear is a position (angle) servo driver, which is suitable for control systems that require changing angles that can be maintained, and has at present been widely used in various fields such as high-end remote control toys, for example, aircraft and submarine models, remote robots, etc. Generally, the steering gear is mainly composed of a reduction gear set, a position feedback potentiometer, a control circuit board and a direct current motor. An output shaft of the steering gear is connected to the position feedback potentiometer. The control circuit board receives a control signal from a signal line. An IC on the control circuit board drives the motor to rotate, and the motor drives a series of gear sets to decelerate and then be transmitted to an output steering wheel. When rotating, the steering wheel drives the position feedback potentiometer to output a voltage signal to the control circuit board for feedback, and then the control circuit board determines the rotating direction and speed of the motor according to the position, thereby achieving the stop of a target. In the existing steering gear, the reduction gear set is generally located in a closed chamber, and individual gears of the reduction gear set are meshed by straight teeth. In order to increase the rotational speed of the steering gear and prevent damage to the steering gear, each gear tooth of the reduction gear set in the steering gear is generally greased so as to form a lubricating oil film on the tooth surface of each gear, thereby ensuring that fluid lubrication conditions can be reached in a meshing area and preventing individual gears from rubbing against each other and wearing. Due to limited amount of grease on inner gears of the existing steering gear, the grease will dry out and the gears will wear out after the steering gear works for a period of time, resulting in a decrease in the output speed of the steering gear, affecting the service life of the steering gear, and making noise in severe cases. Therefore, the inventor commits to designing a steering gear to solve the above problems. SUMMARY The present invention aims to provide an oil-immersed steering gear with stable output speed, prolonged service life, and no noise made. In order to achieve the above object, the present invention adopts a technical solution as follows: an oil-immersed steering gear, including a shell assembly, where a control chamber and an oil immersion chamber are separated in the shell assembly, liquid gear oil is filled in the oil immersion chamber, a control board is accommodated in the control chamber, a motor and a potentiometer are arranged on the control board, an output end of the motor is connected to an output gear shat of the potentiometer through a gear transmission assembly in a transmission manner, the gear transmission assembly is located in the oil immersion chamber and immersed in the liquid gear oil, and the output gear shaft rotates to pass through the oil immersion chamber and extend outside the shell assembly. As an improvement of the oil-immersed steering gear of the present invention, an output end surface of the shell assembly is provided with an oil injection hole, which communicates with the oil immersion chamber, and a hole sealing screw is screwed in the oil injection hole in a sealing manner. As an improvement of the oil-immersed steering gear of the present invention, a side surface of the shell assembly is provided with an oil outlet hole, which communicates with the oil immersion chamber, and a transparent oil cap is covered on the oil outlet hole in a sealing manner. As an improvement of the oil-immersed steering gear of the present invention, the oil immersion chamber and the control chamber are separated in a column, the shell assembly includes an upper cover, a middle shell and a bottom cover, the upper cover is covered on the top of the middle shell in a sealing manner to form the oil immersion chamber, and the bottom cover is covered on the bottom of the middle shell in a sealing manner to form the control chamber. As an improvement of the oil-immersed steering gear of the present invention, the motor is located in the control chamber, an output end of the motor is provided with an input gear shaft, and the input gear shaft and the motor are both connected to the shell assembly in a sealing manner. As an improvement of the oil-immersed steering gear of the present invention, an end surface of the motor is connected to the shell assembly in a sealing manner through a motor sealing ring, and the outside of the input gear shaft is connected