Hydraulic damper

FIELD: mechanical engineering.

SUBSTANCE: hydraulic damper comprises piston provided with axial passages and working cylinder filled with fluid. The piston is connected with the rod. The inner side of the cylinder and outer side of the cylinder, which is in a contact with the piston side, are provided with thread. The piston is mounted on the rod for permitting rotation around the rod. The piston is provided with radial passages whose longitudinal axes intersect with the longitudinal axes of the axial passages of the piston. The diameters of the axial passages decrease from the longitudinal axis of symmetry of the piston to its periphery. The radial passages receive movable spring-loaded slide valves whose diameters exceed these of axial passages of the piston.

EFFECT: expanded functional capabilities.

3 dwg

 

The invention relates to mechanical engineering and can be used in the construction of various transport equipment.

Known hydraulic damper described in the book of Derborence A.D. Hydraulic shock absorbers of vehicles. M., engineering, 1962, page 8, Fig. 4. This damper consists of a working cylinder, which is movable in a vertical plane placed a piston rigidly fixed on the rod. The piston has a number of parts, including springs and valves, which are in the process of stroke of the piston exposed to significant loads at pressures from 15 to 30 MPa, which significantly affects their reliability. At the same time, an important disadvantage of such a damper is that it has a constant force resistance and cannot adjust them based on abrupt changes in the external dynamic load, i.e. when the forward speed of the piston varies within very wide limits.

Also known hydraulic damper (hydraulic shock absorber), described in the book Design, calculation and design of locomotives. Edited Nev. M., engineering, 1981, page 95, Fig. 62. The design of this damper is similar and therefore the limitations of their own kind.

Therefore, the aim of the invention is the extension of the operational characteristics of the hydraulic dempf the RA and in particular, the change in a wide range of forces of resistance to the motion of its piston, depending on the abrupt change of the translational velocity of the rod that is widely observed in practice, operation of the hydraulic dampers installed in the suspensions of vehicles, railway rolling stock, etc.

This objective is achieved in that the inner surface of the working cylinder and the external contact with the surface of the piston has a running thread and the piston on the rod is mounted for rotation relative to the latter, the piston is made of radial channels, the longitudinal axes of which intersect with the longitudinal axes of the axial channels of the piston, having different diameters, changing to the lower side of the longitudinal axis of symmetry of the piston to its periphery, and in radial channels movably placed spring-loaded spool, the diameter of which exceeds the value of the diameters mentioned axial channel of the piston.

Figure 1 shows a General view of part of a hydraulic damper in section, figure 2 - cross section of its piston AA and figure 3 - cross section of the piston for CENTURIES.

The hydraulic damper comprises a working cylinder 1 filled with the working liquid 2. The inner surface of the working cylinder 1 is equipped with a running thread 3, interconnected with the similar, made by the external contactor the emnd-surface of the piston 4, which is rotatably mounted on the rod 5 and is fixed by stops 6. The piston 4 provided with axial channels 7, having different diameters, changing to the lower side of the longitudinal axis of symmetry of the piston 4 to its periphery, and radial channels 8, the longitudinal axes of which intersect with the axial channels 7. In radial channels 8 movably placed spools 9, spring-loaded by compression springs 10. The diameter of the spools 9 exceeds the largest diameter of the axial channel 7 of the piston 4.

Operates hydraulic damper as follows. In bridging the micro and macroprocesses roads, for example, trackless vehicle, which in its suspension is the hydraulic damper and the piston rod 5 is connected with the body, and the work cylinder 1 with suspension wheels (this node is not shown in the drawings, since these designs are widely known in the art), and in this case, the rod 5 is moved in the direction of arrow C (Fig 1), and since the piston 4 is connected with the latter, and he gets going on the arrow C. However, the piston 4 is equipped at its outer contact surface of the running thread, which interconnected with the running thread 3, is made on the inner surface of the working cylinder 1, therefore, the translational motion of the piston 4 will be accompanied by its rotation in the direction of arrow D with respect to the working cylinder 1 and the rod 5 When the working fluid 2 will flow through the axial channels 7 on the arrows M, campfire thus such dynamic loads. With increasing dynamic loads on the piston rod 5 will also increase and rotation of the piston 4, accompanied by an angular velocity. Such a rotation depending on the growth of the translational speed of the shaft 5 by the arrow With the centrifugal force F will cause translational movement of spools 9 on the arrows E and such movement will help both the compression springs 10, and they overlap one or more axial channels 7, which will create conditions for the emergence of the forces of the hydraulic resistance in the flow of working fluid 2, and hence the reduction of the translational speed of the piston 4 in the direction of arrow C. At the same time as the axial channels 7 are made of different diameters along the radius of the piston 4, the resistance of the damper when exposed to the rod 5 external load will continue to grow, which will provide effective damping. When the piston 4 in the direction opposite to the arrow C, the process will be similar to the above with the only difference that the working fluid 2 to flow along the axial channels 7 in the opposite direction of the arrow M. as soon As the rotation of the piston 4 will stop valve 9 under the action of compression spring 10 will return to its original position, such as shown in figure 1 and figure 3. Further, the described process is repeatedly p is vteretsa.

Feasibility advantage of the proposed technical solutions in comparison with known constructions obviously due to the fact that the damping body and suspension trackless vehicles by automatically changes the resistance forces will be more effective. The use of the proposed design of the damper in the transport machines will improve the smoothness of its operation, which will create more comfortable conditions for passengers.

Hydraulic damper, consisting of a piston with an axial channel connected with the rod, and a working cylinder filled with a working fluid, wherein the inner surface of the working cylinder and the external contact with the surface of the piston has a running thread, the piston on the rod is mounted for rotation relative to the latter, the piston is made of radial channels, the longitudinal axes of which intersect with the longitudinal axes of the axial channels of the piston, having different diameters, changing to the lower side of the longitudinal axis of symmetry of the piston to its periphery, and in radial channels movably placed spring-loaded spool, the diameter of which exceeds the largest diameter mentioned axial channel of the piston.



 

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Hydraulic damper // 2247269

FIELD: mechanical engineering.

SUBSTANCE: hydraulic damper comprises piston provided with axial passages and working cylinder filled with fluid. The piston is connected with the rod. The inner side of the cylinder and outer side of the cylinder, which is in a contact with the piston side, are provided with thread. The piston is mounted on the rod for permitting rotation around the rod. The piston is provided with radial passages whose longitudinal axes intersect with the longitudinal axes of the axial passages of the piston. The diameters of the axial passages decrease from the longitudinal axis of symmetry of the piston to its periphery. The radial passages receive movable spring-loaded slide valves whose diameters exceed these of axial passages of the piston.

EFFECT: expanded functional capabilities.

3 dwg

FIELD: hydraulic shock absorbers.

SUBSTANCE: viscous friction damper includes housing, partition with openings and rod passing through central opening of partition. Two similar corrugations of elastic material are fastened in housing; central partition is clamped between said corrugations. The last define two different-volume and variable-dimension cavities filled with shock absorbing liquid. Rod has two sites for fluid-tight securing of it to said two corrugations. Openings of partition through which shock-absorbing liquid is pressed are covered by means of flexible membrane providing possibility for controlling their number and size.

EFFECT: enlarged manufacturing possibilities, improved efficiency of shock absorber.

1 dwg

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