Rotary Damper

Abstract

The rotary damper prevents the viscous fluid filled inside from leaking out in high temperature environments such as outdoors in the blazing sun in summer and low temperature environments such as outdoors in winter. [Solution] A space is provided in the rotor 2 and cylinder portion of the rotary damper to absorb pressure changes inside the cylinder 1 that occur due to temperature changes in the viscous fluid, and bubble cushioning or porous cushioning material is placed to reduce internal pressure changes in the cylinder, thereby reducing leakage from the gasket and other sealing parts of the damper body and the intrusion of outside air and rainwater.

Description

[Technical field]

[0001] The present invention relates to the technical field of rotary dampers, and more particularly to dampers using viscous fluids. [Background technology]

[0002] In recent years, at large-scale construction sites using large cranes, a method has been adopted in which a camera is attached near the end of the boom, and the image captured by this camera is displayed on a monitor in front of the operator, who operates the crane while checking the direction of the suspended load and its position relative to the building on the monitor. In this case, no matter what angle the boom changes to, the camera needs to be facing the load suspended directly below from the end of the boom, and it needs to be stable in order to obtain a stable image. A rotary damper is used to prevent this wobble. (Patent Document 1)

[0003] Conventionally, rotary dampers used for such purposes are dampers that seal viscous fluid. When used outdoors in a high-temperature environment due to direct sunlight in summer, the expansion of the internal viscous fluid in such a rotary damper exceeds the holding force of the packing and O-ring that maintain the seal, causing the internal viscous fluid to flow out. In addition, when the internal viscous fluid contracts in low temperatures such as winter, a reduction in pressure occurs inside the rotary damper. If the pressure exceeds the holding force of the packing and O-ring that maintain the seal, outside air or rainwater will enter the inside, causing torque fluctuations (uneven cushioning force) in the rotary damper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2005-090727 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved is the leakage of viscous fluid inside the rotary damper to the outside. [Means for solving the problem]

[0006] Space is provided in the rotor and cylinder structure, and bubble cushioning or porous cushioning material is placed in it. Furthermore, a gap is provided in the space to allow viscous fluid to enter and exit, making it possible to easily absorb the pressure of the expansion or contraction of the viscous fluid, suppressing fluctuations in internal pressure due to changes in ambient temperature and preventing the outflow of the viscous fluid. In addition, a structure in which the rotating shaft passes through a flange-type bearing prevents thrust load from being applied to the packing, O-ring, and rotor, preventing the outflow of the viscous fluid. [Brief description of the drawings]

[0007] [Figure 1] A diagram of the cylinder inside the rotary damper. [Diagram 2] FIG. 2 is a diagram of a flange of a rotary damper. [Diagram 3] This is a cross-sectional view of the entire rotary damper, and will be used to explain the bearings, the rotating shaft, and the flanges. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] First, the internal structure and mechanism of the rotary damper of this invention will be explained using Figure 1. A rotor 2 is placed inside a cylinder 1 which is filled with a viscous fluid. A key is fitted to the rotating shaft 3, which engages with a groove in the rotor so that the rotating shaft and rotor rotate as one unit. When the rotor rotates, the viscous fluid moves through 4 inside the cylinder. The amount of viscous fluid that moves is adjusted by flow control valve 5, which moves back and forth by a screw placed midway through 4, and this makes it possible to adjust the torque of the rotary damper.

[0009] By using the flange-type bearing 32 in FIG. 3, thrust load is not applied to the rotor 33, and outflow of viscous fluid is reduced. [Explanation of symbols]

[0010] 1 Inside of cylinder, 2 Rotor, 3 Rotating shaft, 4, 5 Flow control valve, 6, 7 Cushioning material arrangement hole, 20 Exhaust hole, 30 Flange, 31 Cylinder, 32 Flange type bearing, 33 Rotor, 34 Rotating shaft

Claims

1. A rotary damper with a structure that provides a space for placing bubble cushioning or porous cushioning material in the rotor and cylinder structure, and a gap that allows viscous fluid to enter and exit the space, making it easy to absorb pressure changes caused by the expansion or contraction of the viscous fluid.

2. A rotary damper with a structure that sandwiches the front and rear of the internal rotor with flange-type bearings that pass through the rotating shaft, stabilizing the gap between the rotating shaft, rotor, and the inner wall of the cylinder, and dissipating the thrust load received through the rotating shaft to the outside without applying the load to the rotor.

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