CN203548690U - Hydraulic damper - Google Patents

Abstract

The utility model discloses a hydraulic damper, which comprises a working cylinder, a piston and a sliding piston rod arranged in the working cylinder. The piston divides the working cylinder into an upper chamber and a lower chamber. The piston is provided with a damping channel. The working cylinder is equipped with a screw nut that cooperates with the piston rod to form an internal circulation ball screw drive. The piston includes a piston body and a valve that can move linearly to adjust the opening of the damping channel when the piston body rotates. Degrees slider. Compared with the existing technology, the hydraulic damper adopts the piston rod and the screw nut to cooperate to form an internal circulation ball screw drive to drive the damping plunger slider in the piston body to move, and the damping plunger slider moves along the piston body. Move radially to adjust the gap with the inner wall of the working cylinder, so that the size of the damping channel can be adjusted. The damping force generated by the damper changes with the magnitude of the external force it bears, and the damping effect is good.

Description

a hydraulic damper

technical field

The utility model relates to a shock absorbing device, in particular to a hydraulic damper.

Background technique

Most of the dampers used in automobiles and civil engineering use electricity as the main form of adjusting the damping effect. For some occasions where the energy supply is inconvenient and when the energy supply fails, the expected damping demand cannot be obtained or a great safety failure will occur and the structure will be damaged. Complicated installation is inconvenient. However, the existing passive hydraulic dampers without energy input often produce large vibrations and shocks during use and cannot meet the expected damping requirements, resulting in failure to produce stable and ideal damping output.

Utility model content

The technical problem to be solved by the utility model is to provide a hydraulic damper capable of producing stable and ideal damping output.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a hydraulic damper, including a working cylinder, a piston and a piston rod that can slide in the working cylinder, and the piston divides the working cylinder into an upper chamber and a lower chamber. chamber, the piston is provided with a damping channel, one end of the piston rod is connected to the piston, and the other end protrudes from the outside of the working cylinder and a connecting device is provided at this end, the working cylinder is equipped with a The screw nut constituting the internal circulation ball screw transmission, the outer surface of the piston rod is provided with threads, and the end of the piston rod is in rotation connection with the connecting device. The piston includes a piston body and a piston in the piston body. When the main body rotates, the slider that adjusts the opening of the damping channel can be moved linearly.

The damping passage is arranged on the outer circumferential surface of the piston body, and the piston body is provided with a chute extending radially toward the inside of the piston body on the outer surface of the damping passage, and the chute is provided with a linearly movable The damping plunger slider is provided with a reset mechanism in the chute to shrink the damping plunger slider into the chute.

There are four damping passages evenly distributed along the circumference of the piston body, and four sliding grooves are also uniformly distributed, each of which is provided with a damping plunger slider.

The outer end surface of the damping plunger slider is an arc surface.

The reset mechanism includes a reset spring arranged in the chute, one end of the return spring is connected with the damping plunger slider, and the other end is connected with the inner wall of the chute.

The connecting device is a suspension ring, one end of the suspension ring is provided with a mounting hole, and the other end is connected with the piston rod through a bearing.

The utility model adopts the above-mentioned technical scheme. Compared with the prior art, the hydraulic damper adopts the cooperation of the piston rod and the screw nut to form an inner circulation ball screw transmission, so as to drive the damping plunger slider in the piston body to move. The damping plunger slider moves radially along the piston body to adjust the gap with the inner wall of the working cylinder, so that the opening of the damping channel can be adjusted. The damping force generated by the damper changes with the external force it bears. The damping effect is good, and it has the advantages of simple structure, reliable performance and low production cost.

Description of drawings

Fig. 1 is the sectional view of hydraulic damper of the present utility model;

Fig. 2 is the sectional view of piston;

Fig. 3 is a structural schematic diagram when the damping plunger slider moves to the port of the chute;

Fig. 4 is a structural schematic diagram of the damping plunger slider shrinking into the chute;

The marks in the above figures are: 1. Upper ring; 2. Bearing; 3. Piston rod; 4. Screw nut; 5. Upper end cover; 6. Working cylinder; 7. Upper chamber; 8. Piston; 81. Piston body; 82, damping plunger slider; 83, return spring; 9, lower chamber; 10, lower end cover; 11, lower suspension ring; 12, damping channel.

Detailed ways

As shown in Fig. 1, it is a kind of hydraulic damper of the present utility model, comprises working cylinder 6, piston rod 3 and the piston rod 3 that is located in working cylinder 6 and can slide. The lower end of the piston rod 3 is inserted into the working cylinder 6 to be connected with the piston 8, and the upper end protrudes from the outside of the working cylinder 6 and a connecting device is provided at this end. The upper and lower ends of the working cylinder 6 are closed by the upper end cover 5 and the lower end cover 10, the piston 8 is in close contact with the inner wall of the working cylinder 6, and the working cylinder 6 is divided into an upper chamber 7 and a lower chamber 9, and the piston 8 is provided with a connecting upper chamber Chamber 7 and damping channel 12 of lower chamber 9. The piston rod 3 passes through the upper end cover 5, and another connecting device is provided on the lower end cover 10, and the damper is installed and fixed by the connecting device at the upper end of the piston rod 3 and the connecting device at the lower end of the working cylinder 6.

The working cylinder 6 of the damper is provided with a screw nut 4 that cooperates with the piston rod 3 to form an internal circulation ball screw drive. The inside of the screw nut 4 is provided with balls, and the outer surface of the piston rod 3 is provided with a section screw thread, the screw nut 4 is fixedly installed in the working cylinder 6, the end of the piston rod 3 is connected in rotation with the connecting device, so as to ensure that the piston rod 3 can rotate relative to the connecting device, and when the shock absorber bears external force, it can work The cylinder 6 drives the screw nut 4 to move linearly, and the screw nut 4 drives the piston rod 3 to perform spiral motion through the external thread on the surface of the piston rod 3 . In order to prevent self-locking from being stuck in the screw transmission, it is necessary to set a larger pitch of the external thread on the outer surface of the piston rod 3 .

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the piston 8 in the working cylinder 6 includes a circular piston body 81 and a damping channel 12 that can move linearly when the piston body 81 rotates and is located in the piston body 81. A slider for the opening size. The damping channel 12 is formed by extending on the outer peripheral surface of the piston body 81 in a direction parallel to the axis of the piston body 81, that is, there is a gap between the outer peripheral surface of the piston body 81 and the inner wall of the working cylinder 6 at the position of the damping channel 12, and the rest The parts are still in close contact. On the outer surface of the damping channel 12, the piston body 81 is provided with a chute extending radially toward the inside of the piston body 81, and a damping plunger slider 82 capable of linear movement is provided in the chute. The damping plunger slider 82 shrinks to the reset mechanism in the chute.

When the damper is not working, the damping plunger slider 82 shrinks in the chute, the outer end surface of the damping plunger slider 82 is not in contact with the inner wall of the working cylinder 6, and the damping passage 12 is unblocked. When the damper is working, the damping plunger slider 82 moves toward the inner wall of the working cylinder 6 and protrudes from the chute to adjust the opening of the damping passage 12, thereby changing the damping force generated by the damper.

The movement of the damping plunger slider 82 in the chute is realized by the rotation of the piston 8. When the damper bears the external axial force, the piston 8 can move linearly and rotate under the drive of the piston rod 3, and the piston 8 rotates, so that a centrifugal force can be generated on the damping plunger slider 82, and the damping plunger slider 82 moves in the chute towards the direction away from the center of the piston 8 under the action of the centrifugal force, protrudes from the chute, adjusts and works The gap between the inner walls of the cylinder 6, so that the size of the damping channel 12 can be adjusted. The greater the external axial force, the faster the rotation speed of the piston 8, and the greater the centrifugal force generated, so that the distance between the outer end surface of the damping plunger slider 82 and the inner wall of the working cylinder 6 will be closer, and finally the damping passage 12 Fig. 3 shows the state of the piston 8 when the external axial force is relatively large, and Fig. 4 shows the state of the piston 8 when the external axial force is small.

In the chute, be provided with a return mechanism that makes the damping plunger slide block 82 contract in the chute, the return mechanism is a return spring 83 located in the chute, one end of the return spring 83 is connected with the damping plunger slide block 82, and the other One end is connected with the inner wall of the chute. When the external axial force disappears, the damping plunger slider 82 returns to the initial state under the tension of the return spring 83 , at this time the damping channel 12 is the largest and the damping effect is the smallest. If it is used in a car, the ride comfort can be greatly improved in a state with better road conditions.

Preferably, four damping passages 12 are uniformly distributed along the circumferential direction on the piston body 81 , and four corresponding sliding grooves are also uniformly distributed, and each sliding groove is provided with a damping plunger slider 82 .

The outer end surface of the damping plunger slider 82 is a circular arc surface. When the damping plunger slider 82 moves to the outer edge of the piston body 81, the outer end surface of the damping plunger slider 82 and the outer circumferential surface of the piston body 81 can form a a complete circumference.

Because the piston rod 3 needs to rotate, the working cylinder 6 can only move in a straight line. The connecting device at the upper end of the piston rod 3 is the upper suspension ring 1, the upper end of the upper suspension ring 1 is provided with a mounting hole, and the lower end is connected with the piston rod 3 through a bearing 2, and the upper suspension ring 1 is fixedly installed on the object at the upper end of the damper to ensure that the piston rod 3 can rotate. The connecting device of the working cylinder 6 lower ends is a lower suspension ring 11, the upper end of the upper suspension ring 1 is fixedly connected with the lower end cover 10, and the lower end is provided with a mounting hole, and the lower suspension ring 11 is fixedly installed on the object at the damper lower end through the mounting hole.

Since the working cylinder 6 is filled with damping fluid, it is necessary to ensure a good sealing effect between the piston rod 3 and the screw nut 4. The piston rod 3 and the screw nut 4 form an internal circulation sealed ball screw transmission. In this way, the screw nut 4 can be directly installed on the upper end cover 5 .

In addition, a sealing device can also be arranged between the working cylinder 6 and the polished section of the piston rod 3, the piston rod 3 is only provided with external threads on a part of the outer surface, and the sealing device can be arranged above the screw nut 4, so that sealing can also be realized.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned method, as long as various insubstantial improvements are made by adopting the method concept and technical solution of the utility model, or Directly applying the ideas and technical solutions of the utility model to other occasions without improvement is within the protection scope of the utility model.

Claims (6)

1. a hydraulic damper, comprise clutch release slave cylinder, piston and be located at slidable piston rod in clutch release slave cylinder, piston is divided into upper chamber and lower chambers by clutch release slave cylinder, piston is provided with damp channel, one end of piston rod is connected with piston, the other end stretches out in the outside of clutch release slave cylinder and is provided with connection set at this end, it is characterized in that: in described clutch release slave cylinder, being provided with matches with described piston rod forms the feed screw nut of inner circulation type ball helical gearing, the outer surface of piston rod is provided with screw thread, the end of piston rod and described connection set are for being rotationally connected, described piston comprises piston only and be located at the slide block of can the rectilinear movement described damp channel aperture size of adjusting in piston only when piston only rotates.

2. hydraulic damper according to claim 1, it is characterized in that: described damp channel is located on the outer peripheral surface of described piston only, on piston only, on the outer side surface at damp channel place, be provided with radially towards the inner chute extending of piston only, in chute, be provided with the damping plunger slide that can move linearly, in chute, be provided with and make damping plunger slide be contracted to the resetting-mechanism in chute.

3. hydraulic damper according to claim 2, is characterized in that: described damp channel is along being circumferentially evenly equipped with four on described piston only, and described chute is also evenly equipped with four, is respectively provided with a described damping plunger slide in chute.

4. according to the hydraulic damper described in claim 2 or 3, it is characterized in that: the exterior edge face of described damping plunger slide is arc surface.

5. hydraulic damper according to claim 4, is characterized in that: described resetting-mechanism comprises the Returnning spring being located in described chute, and Returnning spring one end is connected with described damping plunger slide, and the other end is connected with the inwall of chute.

6. hydraulic damper according to claim 5, is characterized in that: described connection set is suspension ring, and one end of suspension ring is provided with mounting hole, and the other end is connected with described piston rod by bearing.

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