CN116006568A - Four-point support type high-torque high-speed shafting - Google Patents

Abstract

The invention discloses a four-point support type high-torque high-speed shafting, which comprises a mandrel and two groups of bearing units, wherein the two groups of bearing units are respectively arranged at two ends of the mandrel; the bearing unit comprises a bearing seat, wherein a space ring assembly and two groups of bearing assemblies are arranged in the bearing seat; the bearing assembly comprises an inner ring, a bearing and an outer ring; the spacer ring assembly is arranged between the two groups of bearing assemblies and comprises an inner spacer ring and an outer spacer ring, the inner spacer ring corresponds to the inner ring, and the outer spacer ring corresponds to the outer ring; the four-point supporting type high-torque high-speed shafting is used for controlling the torque gyroscope. The four-point support type high-torque high-speed shafting has the advantages that the four bearings are used as the support parts at the two ends of the four-point support type high-torque high-speed shafting, so that the bearing capacity of the shafting is enhanced, a larger output torque can be born, the risk of product failure caused by failure of a pair of traditional bearings in operation is reduced by the four bearings, and the operation reliability of the shafting is improved.

Description

A four-point support type large moment high speed shaft system

technical field

The invention relates to the field of control moment gyroscopes, in particular to a four-point support type large-moment high-speed shaft system.

Background technique

The control moment gyro is an inertial actuator, which is mainly used in large-angle maneuvering and attitude control of agile satellites. The control torque gyro generates control torque by changing the direction of angular momentum. Compared with the flywheel, it has the advantages of large output torque, high precision and low power consumption. Based on the demand for high torque output of medium and large control torque gyroscopes, the high-speed rotor must have a large moment of inertia and high speed, resulting in a large size and heavy weight of the whole machine; at the same time, high torque output requires the outer frame to be fast and high-speed. Dynamic maneuvering, these characteristics lead to huge shafting load and low control accuracy.

The high-speed shaft system is the most important part of the control moment gyro, which provides a large moment of inertia and high speed, and is the main component of the control moment gyro failure. At present, the structure of high-speed shafting is mainly a double-bearing support structure supported at one end and a support structure at both ends with one bearing at each end. One-end supported high-speed shafting, due to the short span between bearings, is generally used for small and medium-sized control moment gyroscopes with small output torque. The shafting structure supported by one bearing at each end, with the increasing requirement of the output torque, the single bearing bears a large force, and it is prone to failure during long-term operation; and it is difficult to apply the pretightening force of a bearing at each end , the accuracy is not high, and the shafting rigidity is difficult to guarantee. Therefore, it is necessary to propose a new type of high-speed shafting structure that meets the requirements of high stiffness and high solid frequency under high-speed rotation, reduces the contact stress of the bearing, and achieves a strong load, so as to meet the output requirements of the large torque of the control torque gyroscope.

Contents of the invention

The purpose of the invention is to solve the problems that it is difficult to ensure the rigidity of the shaft system of the existing large-scale control moment gyroscope accurately, and the contact stress of the shaft system bearing is relatively large under the output of large torque.

In order to achieve the above purpose, the present invention provides a four-point support type high-moment high-speed shafting system, which includes a mandrel and two sets of bearing units, and the two sets of bearing units are respectively arranged at both ends of the mandrel;

The bearing unit includes a bearing seat, and a spacer assembly and two sets of bearing assemblies are arranged in the bearing seat;

The bearing assembly includes an inner ring, a bearing and an outer ring;

The spacer assembly is arranged between two groups of the bearing assemblies, and includes an inner spacer and an outer spacer, the inner spacer corresponds to the inner ring, and the outer spacer corresponds to the outer ring ;

The four-point support type high-moment high-speed shaft system is used to control the moment gyroscope.

Optionally, the bearing unit further includes: an upper gland and a lower gland; the upper gland and the lower gland are connected to the bearing seat by screws.

Optionally, the end surfaces of the upper gland and the lower gland are pressed against the outer ring.

Optionally, the bearing unit further includes a ferrule disposed on the side of the lower gland, one end of the ferrule is supported on the shoulder of the mandrel, and the other end is pressed against the inner ring.

Optionally, the bearing unit further includes a lock nut disposed on the side of the upper gland, an end surface of the lock nut is pressed against the inner ring, and the lock nut is threadedly connected with the mandrel.

Optionally, the lock nut is provided with a compression nut for locking the lock nut.

Optionally, there is a height difference between the inner spacer and the outer spacer, and an axial positioning pretightening force is applied to make the two sets of bearing assemblies fixedly connected.

Optionally, two sets of said bearing assemblies are installed back to back.

Optionally, the bearing unit further includes an oil storage ring, the oil storage ring is located between the inner spacer and the outer spacer, and is installed on the inner wall of the outer spacer.

Optionally, the center of the mandrel is a hollow hole to reduce the weight of the mandrel; a stepped structure is provided in the middle of the mandrel for installing a flywheel body and a high-speed motor.

The beneficial effects of the present invention are:

Compared with the traditional high-speed shafting system, the two ends of the four-point-supported high-moment high-speed shafting system of the present invention use four bearings as supporting parts, which effectively share the force of a single bearing, thereby enhancing the bearing capacity of the shafting system and being able to withstand higher loads. Large output torque, and the work of four bearings reduces the risk of product failure caused by the failure of a traditional pair of bearings, and increases the reliability of the shafting operation. The two bearing units at both ends of the mandrel are loaded by positioning and pre-tightening, and the pre-tightening force is applied more accurately, which ensures the axial stiffness of the high-speed shafting system, and the performance of the shafting system is more stable and reliable. The oil storage ring is placed on the static ring of the bearing, which can provide longer time supplementary oil supply for the shaft system and guarantee the long life of the high-speed shaft system. The mandrel is designed to reduce weight, which greatly improves the rigidity of the mandrel, thereby increasing the rigidity of the entire shaft system; both sides of the flange adopt a stepped structure, which provides conditions for the implementation of dual-motor drive operation and ensures the operation accuracy and high torque of the shaft system. output.

Description of drawings

Fig. 1 is a structural schematic diagram of the four-point support type high-moment high-speed shafting of the present invention.

Fig. 2 is a structural schematic diagram of the bearing unit of the present invention.

In the figure, 1-hexagon screw, 2-upper gland, 3-lock nut, 4-bearing, 5-bearing seat, 6-outer spacer, 7-oil storage ring, 8-inner spacer, 9-bottom Gland, 10-ferrule, 11-mandrel, 12-compression nut.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" are based on the drawings The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention . In addition, the terms "first", "second" and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in FIG. 1 , the present invention provides a four-point support type large-torque high-speed shaft system for controlling a moment gyroscope, including a core shaft 11 and bearing units at both ends. Except for the flange part of the mandrel, the radial and axial structures are symmetrical. The center of the mandrel adopts a hollow hole to reduce weight, which reduces the weight of the mandrel and greatly improves the rigidity of the mandrel, thereby improving the rigidity of the entire high-speed shaft system. Guaranteed the running precision of the shaft system and high torque output. The flange of the mandrel is connected to the load wheel body to provide a large angular momentum for the shaft system. Both ends of the flange adopt a stepped structure to provide conditions for the implementation of a dual-motor drive shaft system. The shaft system is driven by a high-speed motor. Spin at high speed. There are a group of bearing units at both ends of the mandrel. The bearing unit and the mandrel are tightly fitted through the cylindrical surface. The high-speed rotation of the mandrel drives the inner ring of the bearing unit to rotate. The bearing unit is used as the supporting part of the external force of the high-speed shaft system to realize the force transmission. Four The bearing support method effectively shares the force of a single bearing, thereby enhancing the bearing capacity of the shaft system and able to withstand a large output torque, and the work of four bearings reduces the risk of product failure caused by a traditional pair of bearings working, increasing the overall High-speed shafting operation reliability.

As shown in Fig. 2, the bearing unit includes a bearing housing 5, and a spacer assembly and two sets of bearing assemblies are arranged in the bearing housing. The bearing assembly includes an inner ring, a bearing 4 and an outer ring; the spacer assembly is arranged between two sets of bearing assemblies, including an inner spacer 8 and an outer spacer 6, and the inner spacer 8 and the Corresponding to the inner ring, the outer spacer 6 is corresponding to the outer ring. Two sets of said bearing assemblies are installed back to back. The inner spacer 8 and the outer spacer 6 have a height difference, exert an axial positioning pre-tightening force, and make the two sets of bearing assemblies fixedly connected. The bearing unit also includes an oil storage ring 7, the oil storage ring 7 is located between the inner spacer 8 and the outer spacer 6, and is installed on the inner wall of the outer spacer 6 to provide the bearing unit with Oil atmosphere, so as to achieve supplementary lubrication for bearings, and realize long life and high reliability of high-speed shafting.

The bearing unit also includes an upper gland 2 and a lower gland 9 . The bearing seat 5 is in clearance fit with the outer ring of the bearing, and the upper gland 2 and the lower gland 9 are connected to the bearing seat 5 through a hexagonal screw 1 in the axial direction. The small-diameter end surfaces of the upper gland 2 and the lower gland 9 are pressed against the outer ring to ensure the connection of the bearing 4, the outer spacer 6, the outer ring, and the upper gland 2/lower gland 9.

The bearing unit also includes a ferrule 10 disposed on one side of the lower gland 9 , one end of the ferrule 10 is supported on the shoulder of the mandrel 11 , and the other end is pressed against the inner ring. The inner ring and the inner spacer ring 8 are tightly fitted with the mandrel 11. A part of the structure of the ferrule 10 is overlapped with a part of the structure of the lower gland 9, so as to strengthen the tight fit between the ferrule 10, the lower gland 9 and the inner ring.

The bearing unit also includes a lock nut 3 arranged on one side of the upper gland 2, the end face of the lock nut 3 is pressed against the inner ring, and the lock nut 3 is threadedly connected with the mandrel 11 , screwed on the mandrel 11 by threads. A part of the structure of the lock nut overlaps with a part of the structure of the upper gland 2, so as to strengthen the tight fit between the upper gland 2, the lock nut 3 and the inner ring. The lock nut 3 is provided with a compression nut 12 for locking the lock nut. The compression nut 12 is additionally locked to ensure that the nut will not loosen under the high-speed rotation of the shaft system.

The two bearing units at both ends of the mandrel 11 are respectively positioned and preloaded, and the preload is applied more accurately, which ensures the axial stiffness of the high-speed shaft system, and the performance of the shaft system is more stable and reliable, providing a guarantee for the realization of large torque output .

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (10)

1. A four-point support type high-torque high-speed shafting system, characterized in that it includes a mandrel and two sets of bearing units, and the two sets of bearing units are respectively arranged at both ends of the mandrel; The bearing unit includes a bearing seat, and a spacer assembly and two sets of bearing assemblies are arranged in the bearing seat; The bearing assembly includes an inner ring, a bearing and an outer ring; The spacer assembly is arranged between two groups of the bearing assemblies, and includes an inner spacer and an outer spacer, the inner spacer corresponds to the inner ring, and the outer spacer corresponds to the outer ring ; The four-point support type high-moment high-speed shaft system is used to control the moment gyroscope. 2. The four-point support type high-moment high-speed shafting system according to claim 1, wherein the bearing unit further comprises: an upper gland and a lower gland; the upper gland and the lower gland pass through Screws are attached to the bearing housing. 3. The four-point support type high-moment high-speed shafting system according to claim 2, wherein the end surfaces of the upper gland and the lower gland are pressed against the outer ring. 4. The four-point support type high-moment high-speed shafting system according to claim 1, characterized in that, the bearing unit further comprises a ferrule arranged on the side of the lower gland, and one end of the ferrule is supported on the The shoulder of the mandrel, the other end is pressed against the inner ring. 5. The four-point support type high-moment high-speed shafting system according to claim 1, wherein the bearing unit further comprises a lock nut arranged on the side of the upper gland, and the end face of the lock nut presses On the inner ring, the locking nut is threadedly connected with the mandrel. 6. The four-point support type high-torque high-speed shafting system according to claim 5, wherein a compression nut for locking the lock nut is provided on the lock nut. 7. The four-point support type high-moment high-speed shafting system according to claim 1, characterized in that, the inner spacer and the outer spacer have a height difference, and an axial positioning pretightening force is applied to make the two sets of spacers The above-mentioned bearing assembly is fixedly connected. 8. The four-point support type high-moment high-speed shafting system according to claim 1, characterized in that two sets of said bearing assemblies are installed back to back. 9. The four-point support type high-moment high-speed shafting system according to claim 1, wherein the bearing unit further includes an oil storage ring, and the oil storage ring is located between the inner spacer and the outer spacer installed on the inner wall of the outer spacer. 10. The four-point support type high-moment high-speed shafting system according to claim 1, characterized in that, the center of the mandrel is a hollow hole to reduce the weight of the mandrel; the middle part of the mandrel is provided with a step Structure for mounting flywheel body and high speed motor.

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