RU181778U1 - Low-amplitude vibration damper - Google Patents

Abstract

The utility model relates to the field of engineering and can be used to damp vibrations of various mechanical structures, provided that the oscillation source and vibration damper are located at a considerable distance from each other (for example, bridges, engines on pylons of aircraft wings, etc.), and also used as an independent damping support. The low-amplitude vibration damper contains a base, an annular spring, a friction pair consisting of a ring with a tribological coating and an eccentric shaft, U-shaped traction, and the base is made collapsible and consisting of two half rings, an elastic guide element is attached to the lower half ring, blocking the rotation of the U-shaped rod around the base, and the eccentric shaft and ring are made with tribological coating on the main and side surfaces. The strength of all the damper nodes allows use it at loads of more than 100 kN and medium pressures on the friction surfaces of the rings of rotational pairs greater than 50 MPa. At the same time, the low-amplitude oscillation damper was able to be made more compact and light (mass not more than 5.2 kg) in comparison with the prototype.

Description

The utility model relates to the field of engineering and can be used to damp vibrations of various mechanical structures, provided that the oscillation source and vibration damper are located at a considerable distance from each other (for example, bridges, engines on pylons of aircraft wings, etc.), and also used as an independent damping support.

Basically, dampers are used to damp vibrations of mechanical structures that are affected by loads that create vibrations in wide frequency ranges under conditions of small displacements of the point of attachment of the damper to the vibrating structure.

There are numerous designs of mechanical dampers (with the movement of bulk solids and spring), hydraulic, hydromechanical. Their designs are protected by a group of patents:

- patent RU No. 2464462 C1 dated 10.20.2012 HYDROMECHANICAL DAMPER, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2461752 C1 dated 09/20/2012 ADAPTIVE HYDROMECHANICAL DAMPER, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2427742 C1 of 08.27.2011 HYDRAULIC DAMPER, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2427741 C1 dated 08/27/2011 HYDRAULIC DAMPER OF OSCILLATIONS, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2427740 C1 dated 08/27/2011 HYDRAULIC DAMPER, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2324090 C1 from 10.05. 2008 DAMPER, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2324089 C1 as of May 10, 2008 HYDRAULIC DAMPER, IPC F16F 9/14 F16F 5/00,

- patent RU No. 2135856 C1 dated 08/27/1999 HYDRODEMPHERE, IPC F16F 9/14 F16F 5/00.

All of the above dampers can be used only in conditions where the source and vibration damper are located in close proximity to each other.

For the prototype we take the mechanical damper of low-amplitude vibrations with rotational friction pairs patent RU No. 2544046 C2 MPK F16F 7/02 of 02/05/2015. The mechanical damper of low-amplitude vibrations with rotational friction pairs consists of a base, an annular spring, a ring with a tribological coating, an eccentric shaft, two adjusting rings, a shaft with tapered seats. The main disadvantage of this device is the small value of the workloads of the damper, clearly insufficient for operation in real conditions.

The objective and technical result of the utility model is to create a low-amplitude oscillation damper for operation in real conditions, when the magnitude of the workloads on the damper and the pressure on the coatings are an order of magnitude higher than the values at which the prototype was tested.

The solution of the problem and the technical result are achieved in that the low-amplitude vibration damper containing the base, an annular spring, a friction pair consisting of a tribological coating ring and an eccentric shaft additionally contains a U-shaped rod, the base is made collapsible and consists of two half rings, to an elastic guide element is attached to the lower half ring, blocking the rotation of the U-shaped rod around the base, and the eccentric shaft and ring are made with a tribological coating on the main and side surfaces.

The figure 1 presents the damper low-amplitude oscillations

The figure 2 shows a collapsible base and an elastic guide element with fasteners.

Figure 3 shows a roller for articulating the half rings.

The figure 4 shows the lower half ring with a mounting rack.

The figure 5 shows an elastic guide element and a screw with a washer.

The figure 6 shows the shaped spring.

The figure 7 shows the eccentric shaft.

The figure 8 shows the upper half ring with a tribological coating.

The figure 9 shows the lower half ring with a tribological coating.

The figure 10 shows a shaped spring, an eccentric shaft, a tribological-coated ring, a collapsible base and an elastic guide element with fasteners.

The figure 11 shows the fasteners for assembling the base, spring and cam shaft.

The figure 12 shows the eccentric shaft, a tribological-coated ring, a collapsible base and an elastic guide element with fasteners.

The figure 13 shows the rings with an external tribological coating.

The figure 14 presents the mechanical damper of low-amplitude vibrations with rotational friction pairs, shows the positions of the screws and washers.

The damper consists of a base 1 (figure 1, 2, 4), which is formed by hinging two half rings 2 and 3. There is a mounting hole on the damping object adjacent to the half ring 2 to the damping object or the mounting base of the damping object (figure 2). The articulation of the half rings 2 and 3 is carried out using the roller 14 (figures 2, 3). The closure of the semirings into a ring with an inner diameter corresponding to the fixed fit of the ring of the rotational pair (bearing) is carried out using the screw 7 and the washer 13 (figure 2). The final processing of the hole in the base 1 for a fixed fit of the ring of the rotary pair is carried out only after installing the screw 7 and the washer 13. An elastic guide element 9 is installed on the half-ring 2 with the help of screw 7 (figure 5). Inside the hole in the base 1 (figure 12) are placed two half rings 11, 12, together forming a bearing ring of a rotational pair. On the inner cylindrical surfaces of the semirings 12 and their ends, an ASO tribological coating is applied. When tested, this coating showed the best results. An eccentric shaft 10 (figure 7), a cylindrical surface of the middle part of the eccentric shaft 10 and half rings 11, 12 together form a rotary pair (figure 12) is placed inside the bearing ring of the rotational pair formed by the half rings 11, 12 (figure 8, 9). The landing of the rotary pair is sliding. It is assumed that during operation of the damper, as the running-in of the coating of the half rings 11, 12 is made, it is possible to replace the mounting washer 13 with a thinner washer to eliminate excessive backlash (figure 10).

The base 1, together with the parts attached to it, is placed inside the annular shaped spring 8 (figure 6). One of the ends of the shaped spring 8 is pivotally attached to the base 1, and the other end is pivotally connected to the brackets on the cam shaft 10. The hinged connection of the spring is made using three rollers 15, coated with ACO, six washers 16 and six cotter pins 17 (figure 10 , eleven).

Two rings of rotational pairs 18 are dressed on the outer cylindrical surfaces of the eccentric shaft 10 (Figure 12, 13), tribological coating ASO is applied to their inner cylindrical surfaces and the ends adjacent to the eccentric shaft. The rings of rotational pairs 18 with their outer seating surfaces are fixedly mounted inside the holes of the U-shaped rod 19 (figures 1, 14) with a mounting hole to the damping object at the opposite end. The fixed position of the rings of the rotational pairs 18 in the holes of the U-shaped rod 19 is made by terminal clamps using screws 20 and washers 21 (figure 14). It is assumed that during operation of the damper, as the rings 18 are run-in, it is possible to replace the mounting washers 21 with thinner washers to eliminate unnecessary backlash. The lower ends of the U-shaped rod 19 using bolts 22 and washers 23 are connected to the ends of the elastic guide element 9 (figure 1, 14).

An elastic guide element 9 is embedded in the design of the damper to prevent rotation of the U-shaped rod 19 around the hole in the base 1 when the damper is in tension and compression by applying a load to its mounting holes on the base 1 and the U-shaped rod 19.

The strength of all nodes of the damper allows you to use it with loads of more than 100 kN and medium pressures on the friction surfaces of the rings of rotational pairs greater than 50 MPa. At the same time, the low-amplitude vibration damper c was able to be made more compact and light (mass not more than 5.2 kg) in comparison with the prototype.

Claims (1)

A low-amplitude vibration damper containing a base, an annular spring, a friction pair consisting of a tribological-coated ring and an eccentric shaft, characterized in that it further comprises a U-shaped rod, the base is collapsible and consisting of two half rings, an elastic guide is attached to the lower half ring an element blocking the rotation of the U-shaped traction around the base, and the eccentric shaft and ring are made with a tribological coating on the main and side surfaces.

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