RU2708517C2 - Rotary damper - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to the machine building. Rotary damper includes housing on one side of which shaft is installed with possibility of rotation and without possibility of axial movement. Sleeve with a main compression spring is screwed onto the threaded part of the shaft inside the housing. Sleeve is fixed in the housing so that when the shaft rotates, the sleeve only has translational motion. Screw with composite nut is installed coaxially with shaft with possibility of free rotation and without possibility of axial movement. Composite nut pre-deforms the main spring and is fixed in the sleeve so that when the sleeve moves the composite nut has only translational movement. Under action of the force created by the main spring, the composite nut represents two elements moving along the screw, which are extended by the compression spring. Spring force is adjusted by means of nut moving along extreme element.

EFFECT: resistance to motion is achieved, which increases as the speed of rotation of the damper elements increases in any climatic conditions of operation.

1 cl, 3 dwg

Description

The present invention relates to devices, limiting the speed of rotation of the elements of the spacecraft, under the action of the torque created by the spring drives of the mechanical deployment devices of these elements.

From the prior art, a rotary damper is known (patent RU 2440522 C1 F16F 9/12 12/22/2008), comprising a housing with a receiving channel formed therein with an opening at one end and a lower section at the other. The pivoting member is rotatably and held in the open end portion of the receiving channel. The piston is located between the rotary element and the coil spring located in the lower section. The locking means prevents the piston from turning and causes the piston to stop at a predetermined starting position. The displacement blocking means prevents the piston from moving beyond the second position. The moving means comprises a biasing means and a cam mechanism. The biasing means displaces the piston from the first position in the direction of the second position, deforming the coil spring, while the rotation resistance of the rotary element increases as its rotation angle increases, thereby limiting the rotation speed of the rotary element.

The design shortcomings of this rotary damper is that when it is used as a part of mechanical devices for deploying elements of the spacecraft under the action of the driving moment created by the spring drives of these devices, the limitation of the speed of rotation of one element relative to another is achieved due to the creation of a resistance to movement by the damper, which increases in the turning process and becomes maximum at the end of the movement, that is, the resistance to movement created by the damper depends from the magnitude of the deformation of the spiral spring. Thus, this damper works like a brake and, when used in the construction of mechanical devices for deploying elements of the spacecraft, will impede their immediate deployment.

From the existing level of technology, the closest to the claimed solution (prototype) is a rotary damper (patent US 2003/0111308 A1 F16F 9/14 06/19/2003) containing a housing with many chambers filled with liquid with a given viscosity. A shaft is mounted in the housing rotatably relative to the housing, having several blades, the number of which is equal to the number of chambers in the housing. The blades divide the chambers into constricting and expanding chambers. Moreover, the shaft has openings that allow viscous fluid through the center of the rotor to flow from the compression chambers to the expanding chambers when the rotor rotates under the action of a torque, while the rotation resistance of the rotor increases as its rotation speed increases, thereby limiting the rotation speed of the rotary element.

The design shortcomings of this rotary damper is that when it is used as a part of mechanical devices for deploying elements of the spacecraft, under the action of the torque generated by the spring drives of these devices, the limitation of the speed of rotation of one element relative to another depends on the climatic conditions of the damper, then there is resistance to movement created by the damper increases when the liquid is cooled and decreases when it is heated. Thus, in outer space, such a device will require certain temperature conditions, which will entail the complication of the damper design and the consumption of additional energy from the spacecraft.

The problem to which the claimed invention is directed is to create a rotary damper, using which, as part of the mechanical devices for deploying elements of the spacecraft, under the action of the torque created by the spring drives of these devices, the speed of rotation of one element relative to another is achieved by creating a damper resistance to movement, which increases with increasing speed of rotation of these elements in any climatic conditions kspluatatsii.

The task of the invention is achieved through the use of a rotary damper containing a housing in which the shaft is mounted with the possibility of rotation and without the possibility of axial movement. A sleeve with a main compression spring is screwed onto the threaded part of the shaft inside the case and fixed in the case so that when the shaft rotates, the sleeve has only translational motion. Coaxially with the shaft, with the possibility of free rotation and without the possibility of axial movement, a screw with a compound nut is installed, which, after deforming the main spring, is fixed in the sleeve so that when the sleeve is moved, the composite nut has only translational motion, under the action of the force created by the main spring. A composite nut consists of two elements moving together along a screw, bursting with a compression spring, the force of which is regulated by means of a nut moving along the extreme element. Moreover, all helical gears must satisfy the condition under which the angle of the thread should be greater than the angle of friction in the corresponding thread.

In FIG. 1 shows a general view of a rotary damper;

In FIG. 2 - damper at the beginning of deployment;

In FIG. 3 - damper at the end of deployment.

The rotary damper comprises a housing 1 into which a shaft 2 is mounted rotatably and without axial movement. A sleeve 8 with a main compression spring 5 is screwed onto the threaded part of the shaft inside the case and fixed in the case so that when the shaft rotates, the sleeve has only translational movement. Coaxial with the shaft, with the possibility of free rotation and without the possibility of axial movement, a screw 3 is installed with a composite nut 4, which, after deforming the main spring, is fixed in the sleeve so that when the sleeve is moved, the composite nut has only translational movement under the action of force created by the main spring. A composite nut consists of two elements moving together along a screw, bursting with a compression spring 6, the force of which is regulated by means of a nut 7 moving along the extreme element. Moreover, all helical gears must satisfy the condition under which the angle of the thread should be greater than the angle of friction in the corresponding thread.

это приводит к тому, что основная пружина начинает сжиматься, а усилие F₁ начинает расти, пока не достигнет значения достаточного для обеспечения условия V₁=V₂. Таким образом, увеличение усилия F₁ приводит к росту сопротивления перемещения втулки и как следствие вращения вала, за счет чего происходит ограничения скорости вращения вала.Rotary damper works as follows. When the damper shaft is rotated (by an angle α under the action of a torque M, with a given angular velocity ω), the sleeve with the main spring moves along the shaft with the given linear speed V ₁ by the distance S. The main spring, previously deformed by the compound nut, begins to act on it with a given force F ₁ sufficient to displace the latter with a speed V ₂ equal to the speed of the sleeve. The speed V ₂ depends on the frictional forces arising in the screw gear screw-compound nut and is determined by the force F _{2 of the} compression spring located between the two elements of the composite nut, which is regulated by a nut moving along the extreme element. At the moment when the angular velocity of the shaft becomes greater than the set, the displacement speed of the sleeve becomes greater than the displacement speed of the composite nut

this leads to the fact that the main spring begins to compress, and the force F ₁ begins to increase until it reaches a value sufficient to ensure the condition V ₁ = V ₂ . Thus, an increase in the force F ₁ leads to an increase in the resistance to movement of the sleeve and, as a consequence, the rotation of the shaft, due to which the speed of rotation of the shaft is limited.

Claims (2)

1. A rotary damper comprising a housing, on one side of which a shaft is mounted with the possibility of rotation and without the possibility of axial movement, characterized in that a sleeve with a main compression spring is screwed onto the threaded part of the shaft located inside the housing and fixed in the housing so that when turning the shaft, the sleeve had only translational motion, coaxial with the shaft, with the possibility of free rotation and without the possibility of axial movement, a screw is installed with a compound nut, which By aligning the main spring, it is fixed in the sleeve so that when moving the sleeve the composite nut has only translational motion under the action of the force created by the main spring, the composite nut consists of two elements moving together along a screw, bursting by a compression spring, the force of which is regulated by the nut moving along the extreme element. 2. The rotary damper according to claim 1, characterized in that all helical gears must satisfy the condition under which the angle of the thread should be greater than the angle of friction in the corresponding thread.

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