阅读说明：本技术 一种适用于空间环境的精密驱动关节 (Precision driving joint suitable for space environment ) 是由 赵明宣 殷爱平 陈宝东 励吉鸿 钱志源 于 2020-03-23 设计创作，主要内容包括：本发明提供了一种适用于空间环境的精密驱动关节,包括：直流力矩电机、光电编码器、角接触轴承、深沟球轴承、壳体、电机端盖、尾罩、驱动轴组件、轴承固定螺母、轴承挡圈、轴承隔圈、电机调整垫片、电机固定螺母、轴套和码盘转接环；其中,驱动轴组件由驱动轴前端和驱动轴末端组成。该关节采用以直流力矩电机作为驱动源的直接驱动,光电码盘采集轴系角度,定位预紧的背对背安装的角接触轴承支撑轴系,驱动轴组件和壳体采用钛合金材料,所有的定位配合面均采用0～5微米过盈量的小过盈配合。本驱动关节具有温度适应范围大、抗振、抗冲击、无轴系回差、回转精度和测角精度高、精度稳定性高等优点。(The invention provides a precision driving joint suitable for a space environment, which comprises: the device comprises a direct-current torque motor, a photoelectric encoder, an angular contact bearing, a deep groove ball bearing, a shell, a motor end cover, a tail cover, a driving shaft assembly, a bearing fixing nut, a bearing retainer ring, a bearing spacer ring, a motor adjusting gasket, a motor fixing nut, a shaft sleeve and a code wheel adapter ring; wherein, the drive shaft subassembly comprises drive shaft front end and drive shaft end. The direct drive that uses direct current torque motor as the driving source is adopted to this joint, and the photoelectric encoder gathers shafting angle, and the angular contact bearing support shafting of back-to-back installation of location pretension, the drive shaft subassembly and casing adopt titanium alloy material, and all location fitting surfaces all adopt the little interference fit of 0 ~ 5 micron magnitude of interference. The driving joint has the advantages of large temperature adaptation range, vibration resistance, impact resistance, no shaft system return difference, high rotation precision, high angle measurement precision, high precision stability and the like.)

1. A precision driving joint suitable for a space environment is characterized by comprising a direct-current torque motor, a shell, a driving shaft assembly and a photoelectric encoder; the direct-current torque motor comprises a motor stator and a motor rotor, the motor stator is fixed in the inner cavity of the shell, and the motor rotor is fixed on the driving shaft assembly; the driving shaft assembly comprises a driving shaft front end and a driving shaft tail end, the driving shaft front end is supported by a pair of angular contact bearings, and a photoelectric encoder is mounted at the driving shaft tail end; and the photoelectric encoder and the motor rotor are supported by a deep groove ball bearing.

2. A precision drive joint adapted for use in a space environment as in claim 1 wherein said drive shaft nose is radially positioned with respect to said servo mechanism by a spigot and circumferentially positioned with a cylindrical pin in a fixed plane.

3. The precision drive joint suitable for the space environment as claimed in claim 1, wherein the housing is radially positioned between the spigot and the servo mechanism, and is circumferentially fixed between the connecting flanges by taper pins for screw fastening.

4. The precision drive joint suitable for the space environment as claimed in claim 1, wherein the angular contact bearing is installed in an inner cavity of a front positioning spigot of the precision drive joint and used for supporting a servo mechanism shaft system; the inner ring of the angular contact bearing is pressed tightly by a bearing fixing nut, and the outer ring of the angular contact bearing is fixed by a bearing retainer ring.

5. A precision actuated joint adapted for use in a spatial environment as claimed in any one of claims 2 to 4 wherein said spigot is adapted to achieve high precision radial positioning with a small interference fit of interference of 0 to 5 microns.

6. The precision drive joint suitable for the space environment is characterized in that the motor rotor is fixed on the drive shaft assembly through a motor fixing nut, and the axial distance between the motor rotor and the motor stator is adjusted through a motor adjusting gasket between the motor rotor and the shaft shoulder.

7. The precision drive joint suitable for the space environment as claimed in claim 1, wherein the precision drive joint further comprises a motor end cover, the motor end cover is fixed at the tail end of the shell, radial positioning between the motor end cover and the tail end of the shell is realized through a spigot, and circumferential positioning is realized through a taper pin on a fixed plane.

8. The precision drive joint suitable for the space environment is characterized in that the tail end of the drive shaft and the end cover of the motor are supported by a deep groove ball bearing, the inner ring of the deep groove ball bearing is fixed through a shaft sleeve and a coded disc adapter ring, and the outer ring of the deep groove ball bearing moves.

9. The precision drive joint suitable for the space environment as claimed in claim 8, wherein the photoelectric encoder is protected by a tail cover and is installed at the tail part of the precision drive joint, the reading head and the signal processing board of the photoelectric encoder are installed on the motor cover, the code disc of the photoelectric encoder is fixed on the code disc adapter ring, and the tail cover is fixed on the outer cylindrical surface of the motor cover.

10. The precision drive joint suitable for the space environment as claimed in claim 9, wherein the angular contact bearing realizes the pre-tightening force loading by adjusting the height difference of the bearing spacer ring.

Technical Field

The invention relates to the technical field of aerospace electromechanical, in particular to a precision driving joint suitable for a space environment.

Background

The space precision driving joint is used for driving a space mechanism shafting in the aerospace field to rotate and detecting the rotation angle of the shafting in real time, and is a core component of precision machinery such as an optical camera, an optical communication and microwave radar servo mechanism. The level of skill in the drive joint determines the level of precision of the above-described spatially precise machines.

In order to meet the requirements of optical loads and microwave radars, the driving precision rotation precision and the angle measurement precision of a servo mechanism shafting driving joint need to reach the order of arc seconds. The existing space driving joint is mainly used for a spacecraft data transmission antenna, a relay antenna and a radar antenna, the precision is below an angular division level, and the requirement of the precision machinery can not be met.

In the rooms of ground plants, laboratories and the like, the environment temperature is controllable, no vibration impact interference exists, and under the condition that the weight cost is not considered, mature products are developed for selection. However, in space applications, the temperature and mechanical conditions are much worse, and the light weight of the product needs to be considered, so that new and even subversive designs are needed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a precision driving joint suitable for a space environment, the precision driving joint comprising: the device comprises a direct-current torque motor, a photoelectric encoder, an angular contact bearing, a deep groove ball bearing, a shell, a motor end cover, a tail cover, a driving shaft assembly, a bearing fixing nut, a bearing retainer ring, a bearing spacer ring, a motor adjusting gasket, a motor fixing nut, a shaft sleeve and a code wheel adapter ring.

A motor stator of the direct-current torque motor is fixed in the inner cavity of the shell, a motor rotor is fixed on the driving shaft assembly through a motor fixing nut, and torque is transmitted between the motor rotor and the driving shaft assembly through a flat key; the front end of the driving shaft is supported by a pair of angular contact bearings, and the tail end of the driving shaft is provided with a photoelectric encoder; and a deep groove ball bearing is used for supporting the motor rotor and the photoelectric encoder.

The drive shaft assembly comprises a drive shaft front end and a drive shaft tail end, is a stepped split hollow shaft and is formed by combination machining; radial positioning is realized between the front end of the driving shaft and the tail end of the driving shaft through a small interference fit spigot, and circumferential positioning is realized by punching a taper pin on a fastening plane.

The angular contact bearing is arranged in the inner cavity of the positioning spigot at the front end of the driving joint in a back-to-back positioning mode and can be used for supporting a servo mechanism shaft system; the inner ring of the angular contact bearing is tightly pressed by a bearing fixing nut, and the outer ring of the angular contact bearing is fixed by a bearing retainer ring.

The code wheel adapter ring is used as an adjusting link for installing the photoelectric encoder, the code wheel installing surface can be polished, and the end face runout of a driving joint shaft system is ensured to meet the code wheel installing requirement.

The rotor of the precision driving joint, namely the front end of the driving shaft, and the servo mechanism are radially positioned through a small interference fit spigot, and are circumferentially positioned on a fixed plane through a cylindrical pin.

The precise driving joint stator, namely the shell, realizes radial positioning between the spigot and the servo mechanism, and is circumferentially fixed between the connecting flanges through the taper pin to be fastened by screws.

The shell and the driving shaft assembly are made of TC4 materials, and the thermal expansion coefficients of the shell and the driving shaft assembly are basically consistent with those of bearing steel G95Cr18 materials of inner and outer rings of an angular contact bearing and a deep groove ball bearing.

And the middle spigot of the driving joint is matched with a small interference of 0-5 microns in interference to realize high-precision radial positioning.

The precision driving joint has the advantages of large temperature adaptation range, vibration resistance, impact resistance, no shaft system return difference, high rotation precision, high angle measurement precision, high precision stability and the like.

Drawings

FIG. 1 is a schematic view of a precision drive joint assembly suitable for use in a space environment according to the present invention;

FIG. 2 is a schematic diagram of a precision drive joint adapted for use in a space environment according to the present invention;

FIG. 3 is a schematic diagram of a DC torque motor suitable for use in a space environment according to the present invention;

FIG. 4 is a schematic view of a drive shaft assembly adapted for use in a space environment in accordance with the present invention.

Description of reference numerals:

the device comprises a direct current torque motor 1, a photoelectric encoder 2, an angular contact bearing 3, a deep groove ball bearing 4, a shell 5, a motor end cover 6, a tail cover 7, a driving shaft assembly 8, a bearing fixing nut 9, a bearing retainer ring 10, a bearing spacer ring 11, a motor adjusting gasket 12, a motor fixing nut 13, a shaft sleeve 14, a coded disc adapter ring 15, a motor rotor 101, a motor stator 102, a driving shaft front end 801 and a driving shaft tail end 802.

Detailed Description

The invention provides a precision driving joint suitable for space environment, and the specific implementation mode of the invention is further described in detail in the following with reference to the attached drawings.

The assembly schematic diagram of the precision driving joint of the invention is shown in figure 1, and figure 2 is the appearance schematic diagram of the precision driving joint of the invention, comprising: the device comprises a direct-current torque motor, a photoelectric encoder, an angular contact bearing, a deep groove ball bearing, a shell, a motor end cover, a tail cover, a driving shaft assembly, a bearing fixing nut, a bearing retainer ring, a bearing spacer ring, a motor adjusting gasket, a motor fixing nut, a shaft sleeve and a code wheel adapter ring.

The precision driving joint adopts a split type motor, as shown in figure 3; the motor stator is arranged in the inner cavity of the shell through a positioning surface at one end, and the other end of the motor stator is fixed through a countersunk screw; the electronic rotor is fixed on the driving shaft assembly by a motor fixing nut, torque is transmitted through a flat key, and the axial distance between the electronic rotor and a motor stator is adjusted through a motor adjusting gasket between the electronic rotor and a shaft shoulder; the front end of the driving shaft is supported by a pair of angular contact bearings; the end cover of the motor is fixed at the tail end of the shell by using a screw, the radial positioning between the end cover and the shell is realized through a spigot, and the circumferential positioning is realized by punching a taper pin on a fixed plane; the tail end of the driving shaft and the motor end cover are supported by a deep groove ball bearing, the inner ring of the bearing is fixed by a shaft sleeve and a coded disc adapter ring, and the outer ring moves; the photoelectric encoder is protected by a tail cover and is arranged at the tail part of the precision driving joint, a reading head and a signal processing board of the photoelectric encoder are arranged on a motor cover, and a code disc is stuck and fixed on a code disc adapter ring. Wherein, the tail cover is fixed on the outer cylindrical surface of the motor end cover by a countersunk screw.

The driving shaft assembly is shown in fig. 4, comprises a front end of a driving shaft and a tail end of the driving shaft, is a stepped split hollow shaft, and is formed by combination machining; radial positioning is realized between the front end of the driving shaft and the tail end of the driving shaft through a spigot, and circumferential positioning is realized by punching a taper pin on a fastening plane so as to fasten the driving shaft by screws.

The angular contact bearing is arranged in the inner cavity of the positioning spigot at the front end of the driving joint in a back-to-back positioning mode and can be used for supporting a servo mechanism shaft system; the pretightening force is 120N, and the pretightening force loading is realized by adjusting the height difference of the inner bearing space ring and the outer bearing space ring of the bearing; the inner ring of the bearing is pressed tightly by a bearing fixing nut, and the outer ring is fixed by a bearing retainer ring.

The code wheel adapter ring is used as an adjusting link for installing the photoelectric encoder, the parallelism of two surfaces of the code wheel adapter ring is adjusted by grinding the code wheel installation surface, and the end face runout of a driving joint shaft system is ensured to meet the code wheel installation requirement.

The rotor of the precision driving joint, namely the front end of the driving shaft assembly, is radially positioned with the servo mechanism through a spigot, the cylindrical pin is used for circumferential positioning on a fixed plane, and a fixing screw is screwed in from the servo mechanism end.

The precise driving joint stator, namely the shell, realizes radial positioning between the spigot and the servo mechanism, and is circumferentially fixed between the connecting flanges through the taper pin to be fastened by screws.

The shell and the drive shaft assembly are made of TC4 material, and the thermal expansion coefficient of the shell and the drive shaft assembly is basically consistent with that of bearing steel G95Cr18 material of the inner ring and the outer ring of the bearing.

And the middle spigot of the driving joint is matched with a small interference of 0-5 microns in interference to realize high-precision radial positioning.

It should be noted that the foregoing is only illustrative and illustrative of the present invention, and that any modifications and alterations to the present invention are within the scope of the present invention as those skilled in the art will recognize.