A roller friction damper capable of achieving variable damping force output

Abstract

The present invention provides a roller friction damper capable of outputting variable damping force, and belongs to the technical field of structural vibration reduction. The damper comprises a friction plate, a support plate, a linear bearing, a damping force output shaft, a pre-tightening bolt, a roller fixing structure, a roller, a fixing plate, a deep groove ball bearing, and a screw. Under the action of an external load, the roller rolls on the friction surface of the friction plate, and under the action of rolling friction, outputs a damping force, thereby dissipating the vibration energy. The present invention can achieve nonlinear variable friction damping by changing the shape of the horizontal friction surface, and can be applied to vibration reduction of equipment under variable load. The present invention is provided with a self-resetting device, which can automatically return to the initial state after the external excitation disappears. In addition, the output damping force of the present invention is highly accurate, and can achieve efficient vibration reduction under small-amplitude excitation and variable-amplitude excitation. The present invention has the characteristics of simple structure, low cost, and the ability to output variable damping force.

Description

Technical Field

[0001] The invention belongs to the technical field of structural vibration reduction, and mainly relates to a roller friction damper capable of realizing variable damping force output. Background Art

[0002] Dampers absorb energy and reduce vibration by providing resistance to mechanical equipment or structures through movement. They are widely used in aerospace, rail transit, marine vessels, and other fields. Existing friction dampers are primarily used for seismic vibration reduction in major engineering structures, large machinery, and vehicles. However, for equipment with smaller loads, such as instrument panels and engines, which experience less excitation, existing friction dampers struggle to start sliding under small excitations, resulting in poor vibration energy dissipation and inability to effectively isolate vibration.

[0003] Furthermore, existing friction dampers struggle to achieve high-precision damping force adjustment for constantly changing excitations. Furthermore, wear and tear during motion can affect the damper's service life and output damping force. Therefore, developing novel friction dampers with adjustable damping force is crucial for improving the accuracy of various precision instruments operating under small or variable excitations. Summary of the Invention

[0004] In order to solve the problem that the damping force of traditional dampers is fixed, the adjustable range of the damping force is small, and it cannot meet the effective vibration reduction and isolation requirements under small excitation conditions, the present invention provides a roller friction damper that can achieve variable damping force output.

[0005] The damper includes a friction plate, a support plate, a linear bearing, an output shaft, a fixing bolt, a pre-tightening bolt, a roller fixing structure, a roller, a fixing plate, a deep groove ball bearing and a screw; the two friction plates are connected to the two support plates by pre-tightening bolts, and the two linear bearings are respectively connected to the left and right support plates by fixing bolts; the two ends of the roller are respectively mounted on the roller fixing structure and the deep groove ball bearings on the fixing plate, and the roller fixing device is fixed to the fixing plate by screws to form a roller motion device; the output shaft is connected to the roller motion device by a threaded pair, and the output shaft slides along the linear bearing. At the same time, the roller motion device is placed between the upper and lower friction plates, and the two rollers are respectively in contact with the friction surfaces of the two friction plates, and the rollers roll on the friction surfaces as the output shaft moves; the output shaft is connected to the excited external structure through a coupling, and the other end is connected to the main structure through a coupling mounted outside the linear bearing to realize the damping effect between the excitation and the main structure.

[0006] Furthermore, the friction plate includes a horizontal friction surface 1, two symmetrically distributed slope surfaces 2, two symmetrically distributed slope surfaces 3, and two symmetrically distributed slope surfaces 4.

[0007] Furthermore, by changing the width of friction surface one, the rolling contact area is adjusted, thereby changing the magnitude of the damping force; the inclination angles of ramp surfaces two, three, and four are gradually increased in sections, and the roller is subjected to a gradually increasing normal force on the contact surface when moving to this point, thereby achieving a segmented increase in stiffness and damping.

[0008] Furthermore, the surface roughness of the contact surfaces of the roller and the friction plate is an important factor affecting the magnitude of the damping force. Increasing the surface roughness of both can increase the output damping force, while decreasing the surface roughness of both can reduce the output damping force.

[0009] Furthermore, a compression spring is introduced into the roller friction damper as a self-resetting device, the spring base plate is connected to the support plate by a fixing bolt, the compression spring is placed between the spring base plate and the pre-tightening nut, the pre-tightening nut can be adjusted on the output shaft through a threaded pair to provide a pre-tightening force for the compression spring, and the anti-loosening nut is connected to the output shaft through a threaded pair to prevent the pre-tightening nut from loosening; when the external excitation of the roller friction damper disappears, the roller motion device can return to its initial position under the action of the compression spring.

[0010] Furthermore, a side roller motion device is introduced into the roller motion device, and the orthogonal positioning and fixation of the two are achieved through the cooperation of the boss and the groove, and then the three are connected and tightened by using the threaded pair on the output shaft; a side friction plate is installed on the side of the damper and fixed by a pre-tightening bolt, and two side rollers installed on the side are in contact with the friction surfaces of the two side friction plates respectively, and the side rollers also roll on the side friction surfaces as the output shaft moves.

[0011] Furthermore, the roller friction damper has two rollers moving on the friction surface, and two side rollers moving on the side friction surfaces, and the damping force is output through the joint action of the four rolling friction structures.

[0012] Furthermore, in order to meet specific vibration isolation requirements, the shape of the horizontal friction surface, the inclination angles of each slope surface, and the surface roughness of the friction surface are designed according to the nonlinear damping force required in actual conditions.

[0013] Beneficial effects:

[0014] 1. The present invention uses rolling friction instead of traditional sliding friction in the friction damper, effectively reducing the damping force of the friction damper, so that the friction damper can be used in situations where small damping is required, and is suitable for micro-vibration reduction of precision equipment.

[0015] 2. The present invention can achieve nonlinear variable friction damping force by changing the shape of the horizontal friction surface, overcoming the defect of fixed damping force of traditional friction dampers.

[0016] 3. The present invention adopts the design of the slope friction surface, so that the damper can increase the normal force through the slope surface when subjected to relatively large excitation, thereby effectively achieving a significant increase in the damping force and effectively enhancing the safety of the damper when subjected to large excitation or impact.

[0017] 4. The present invention takes into account a self-resetting structure, so that the damper returns to its initial state after the excitation disappears, thereby improving the performance of the damper.

[0018] 5. The present invention has a simple structure, low cost, can adapt to harsh external environments, and can be used in vacuum, and has a wide range of applications.

[0019] 6. The roller friction damper of the present invention can output a wide range of adjustable damping force in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the structure of a roller friction damper capable of achieving variable damping force output;

[0021] Figure 2 This is a schematic diagram of the installation of the roller motion device of the roller friction damper;

[0022] Figure 3 The left side view of the roller motion device of the roller friction damper;

[0023] Figure 4 Schematic diagram of the sinusoidal friction plate structure;

[0024] Figure 5 Schematic diagram of the arc-shaped friction plate structure;

[0025] Figure 6 It is a schematic diagram of the double arc friction plate structure;

[0026] Figure 7 Schematic diagram of the structure of the self-resetting roller friction damper;

[0027] Figure 8 Schematic diagram of the structure of the improved roller friction damper;

[0028] Figure 9 Schematic diagram of the installation of the roller motion device for improving the roller friction damper.

[0029] Reference numerals:

[0030] 1-Friction plate; 2-Support plate; 3-First linear bearing; 4-Output shaft; 5-Fixing bolt; 6-Pretightening bolt; 7-Roller fixing structure; 8-Roller; 9-Second linear bearing; 10-Fixing plate; 11-Deep groove ball bearing; 12-Screw; 13-Compression spring; 14-Pretightening nut; 15-Locking nut; 16-Spring base plate; 17-Side friction plate; 18-Side roller fixing structure; 19-Side roller; a1-Friction plate horizontal friction surface one; a2-Friction plate slope surface two; a3-Friction plate slope surface three; a4-Friction plate slope surface four; b1-Boss surface of main roller fixing structure; c1-Groove surface of side roller fixing structure. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] The invention provides a roller friction damper capable of realizing variable damping force output.

[0033] like Figure 1 As shown, the roller friction damper includes a friction plate 1, a support plate 2, a first linear bearing 3, an output shaft 4, a fixing bolt 5, a pre-tightening bolt 6, a roller fixing structure 7, a roller 8, and a second linear bearing 9; the two friction plates 1 are connected to the support plate 2 by the pre-tightening bolt 6, the first linear bearing 3 and the second linear bearing 9 are connected to the support plate 2 by the fixing bolt 5, the two output shafts 4 are connected to the roller motion device by a threaded pair, and the two output shafts 4 are respectively matched with the first linear bearing 3 and the second linear bearing 9. After assembly is completed, the roller motion device is placed between the upper and lower friction plates 1, and the two rollers 8 are respectively in contact with the friction surface of the friction plate 1. The roller 8 rolls on the friction plate 1 as the output shaft moves; the output shaft 4 is connected to the excited external structure through a coupling, and the other end is connected to the main structure through a coupling installed outside the second linear bearing 9 to achieve a damping effect between the excitation and the main structure.

[0034] like Figure 2 and Figure 3 As shown, the roller motion device includes a roller fixing structure 7, a roller 8, a fixing plate 10, a deep groove ball bearing 11, and a screw 12; two deep groove ball bearings 11 are respectively installed in the holes of the roller fixing structure 7 and the fixing plate 10, and the two ends of the roller 8 are respectively installed on the two deep groove ball bearings 11, and the roller fixing structure 7 and the fixing plate 10 are fixed by screws 12.

[0035] like Figure 4As shown, the friction surface of the friction plate 1 includes a horizontal friction surface a1, a slope surface a2, a slope surface a3, and a slope surface a4. When the roller moves on the friction plane a1, the rolling contact area can be adjusted as the width of the horizontal friction surface a1 changes, thereby changing the damping force. When the roller moves onto the slope surface, the inclination angles of the slope surfaces a2, a3, and a4 gradually increase in sections, and the roller is subjected to a gradually increasing contact surface normal force during movement, thereby achieving a segmented increase in stiffness and damping.

[0036] like Figure 5 and Figure 6 As shown in FIG, according to the actual damping force requirements, friction plates of different shapes are designed to output damping forces with different characteristics.

[0037] like Figure 7 As shown, on the basis of the original roller friction damper, a self-resetting device is introduced, including a compression spring 13, a pre-tightening nut 14, a lock nut 15 and a spring base plate 16; the spring base plate 16 is connected to the support plate 2 through a fixing bolt 5, and the compression spring 13 is placed between the spring base plate 16 and the pre-tightening nut 14. The pre-tightening nut 14 can be adjusted on the output shaft 4 through a threaded pair to provide a pre-tightening force for the compression spring 13. The lock nut 15 is connected to the output shaft 4 through a threaded pair to prevent the pre-tightening nut 14 from loosening.

[0038] like Figure 8 As shown, on the basis of the original roller friction damper, a side rolling friction structure is introduced on its side, and the side rolling friction structure includes a side friction plate 17, a side roller motion device, and the side roller motion device includes a side roller fixing structure 18 and a side roller 19; the side friction plate 14 is connected to the support plate 2 through a pre-tightening bolt 6, and the two output shafts 4 are connected to the side roller motion device through a threaded pair, and are respectively matched with the first linear bearing 3 and the second linear bearing 9, so that the side roller motion device is placed between the two side friction plates, and the two side rollers 19 roll on the friction surfaces of the two friction plates 14 respectively.

[0039] like Figure 9 As shown, the roller motion device of the improved roller friction damper includes a roller motion device and a side roller motion device. The roller fixing structure 7 and the side roller fixing structure 18 are positioned by cooperating with the boss surface b1 and the groove surface c1. The roller motion device and the side roller motion device are connected by the threaded pair of the output shaft 4.

[0040] The roller friction damper capable of outputting variable damping force as described above is installed between the excited external structure and the main structure. Its initial position is that the roller is placed at the center of the horizontal friction surface a1. When external excitation is generated, the output shaft will be subjected to tension or pressure, driving the roller to move on the friction surface. At the same time, a continuously changing damping force is generated to consume the energy generated by the vibration process and reduce the vibration of the main structure. When the excitation force continues to increase, the roller moves to the slope surface, and the damper exhibits greater stiffness and generates greater resistance, protecting the main structure from being damaged under greater excitation. After the external excitation disappears, the roller motion device can return to its initial position under the action of the self-resetting device.

[0041] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A roller friction damper capable of achieving variable damping force output, characterized in that: It comprises a friction plate (1), a support plate (2), a first linear bearing (3), a second linear bearing (9), an output shaft (4), a fixing bolt (5), a pre-tightening bolt (6), a roller fixing structure (7), a roller (8), a fixing plate (10), a deep groove ball bearing (11) and a screw (12); the two friction plates (1) and the two support plates (2) are connected by the pre-tightening bolt (6), the first linear bearing (3) and the second linear bearing (9) are respectively connected to the two support plates (2) by the fixing bolt (5), and the two output shafts (4) are connected to the roller motion device by a threaded pair; The roller motion device comprises a roller fixing structure (7), a roller (8), a fixing plate (10), a deep groove ball bearing (11), and a screw (12); both ends of the roller (8) are respectively mounted on the roller fixing structure (7) and the deep groove ball bearing (11) on the fixing plate (10); the roller fixing structure (7) and the fixing plate (10) are fixed by screws (12); the output shaft (4) cooperates with the first linear bearing (3) and the second linear bearing (9); at the same time, the roller motion device is placed between the upper and lower friction plates (1); the two rollers (8) are respectively in contact with the upper and lower friction plates (1); the rollers (8) roll on the friction plates (1) as the output shaft (4) moves; The friction plate (1) comprises a horizontal friction surface 1 (a1), two symmetrically distributed slope surfaces 2 (a2), two symmetrically distributed slope surfaces 3 (a3), and two symmetrically distributed slope surfaces 4 (a4); When the roller moves on the horizontal friction surface one (a1), the rolling contact area is adjusted as the width of the horizontal friction surface one (a1) changes, thereby changing the magnitude of the damping force; when the roller moves on the slope surface, the inclination angles of the slope surface two (a2), the slope surface three (a3), and the slope surface four (a4) gradually increase in sections, and the roller is subjected to a gradually increasing normal force on the contact surface during movement, thereby achieving a segmented increase in stiffness and damping; The self-resetting device comprises a compression spring (13), a pre-tightening nut (14), and a spring base plate (16); the spring base plate (16) is connected to the support plate (2) via a fixing bolt (5); the compression spring (13) is placed between the spring base plate (16) and the pre-tightening nut (14); the pre-tightening nut (14) can be adjusted on the output shaft (4) via a threaded pair to provide a pre-tightening force for the compression spring (13).

2. The roller friction damper capable of achieving variable damping force output according to claim 1, characterized in that: include: The self-resetting device further includes a locking nut (15); the locking nut (15) is connected to the output shaft (4) via a threaded pair to prevent the pre-tightening nut (14) from loosening.

3. The roller friction damper capable of achieving variable damping force output according to claim 2, characterized in that: After the external excitation to the roller friction damper disappears, the roller motion device can return to the initial position under the action of the compression spring (13), thereby realizing a self-resetting function.

4. The roller friction damper capable of achieving variable damping force output according to claim 1, characterized in that: include: A side rolling friction structure is introduced on the side thereof, the side rolling friction structure includes a side friction plate (17), a side roller motion device, and the side roller motion device includes a side roller fixing structure (18) and a side roller (19); the side friction plate (17) is connected to the support plate (2) through a pre-tightening bolt (6), and the two output shafts (4) are connected to the side roller motion device through a threaded pair and respectively cooperate with the first linear bearing (3) and the second linear bearing (9), so that the side roller motion device is placed between the two side friction plates, and the two side rollers (19) respectively roll on the friction surfaces of the two side friction plates (17).

5. The roller friction damper capable of achieving variable damping force output according to claim 4, characterized in that: The roller fixing structure (7) and the side roller fixing structure (18) are positioned by cooperating with the boss surface (b1) and the groove surface (c1), and the roller motion device and the side roller motion device are connected by the threaded pair of the output shaft (4).

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