CN213808618U

CN213808618U - Low-noise hydraulic vibration reduction piston with adjustable damping and hydraulic vibration reducer

Info

Publication number: CN213808618U
Application number: CN202022691129.5U
Authority: CN
Inventors: 郭怀宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-07-27
Anticipated expiration: 2030-11-19

Abstract

A low-noise hydraulic vibration reduction piston with adjustable damping and a hydraulic vibration reducer belong to the technical field of hydraulic vibration reduction. The piston comprises a piston cylinder (7), a movable piston (3) and a fixed piston (6) are arranged in the piston cylinder (7), a piston rod (1) drives the movable piston (3) and the fixed piston (6) to reciprocate, and at least one circulation channel (10) is arranged on the inner wall of the piston cylinder (7); the method is characterized in that: a silencing mechanism is arranged between the movable piston (3) and the fixed piston (6), and the silencing mechanism is sleeved on the outer ring of the piston rod (1) and moves along the axial direction of the piston rod (1). In the low-noise hydraulic vibration damping piston with adjustable damping and the hydraulic vibration damper, the silencing mechanism is arranged between the movable piston and the fixed piston, and the movable piston and the fixed piston are buffered when being attached, so that the noise generated when the movable piston and the fixed piston are attached is effectively eliminated, and the driving experience is improved.

Description

Low-noise hydraulic vibration reduction piston with adjustable damping and hydraulic vibration reducer

Technical Field

A low-noise hydraulic vibration reduction piston with adjustable damping and a hydraulic vibration reducer belong to the technical field of hydraulic vibration reduction.

Background

Hydraulic damping is a common damping mode in the automotive field. The output end and the body of the automobile hydraulic shock absorber are respectively arranged on an automobile body and wheels, a shock absorber piston is arranged in the automobile shock absorber, when the automobile vibrates up and down in the running process, the piston reciprocates in a piston cylinder, and when the piston reciprocates, hydraulic oil on two sides of the piston can flow through the piston in a reciprocating mode through an overflowing hole in the piston in the direction opposite to that of the piston, so that the shock absorbing effect is achieved. In the prior art, the hydraulic damper has the following defects:

the shock absorber piston among the automobile shock absorber realizes the pull under the drive of piston rod, however because the piston rod has taken certain volume in the piston chamber this application, consequently the piston is under the same condition of actual motion and reciprocating motion distance, during the piston rod compression with during recovering, there is the difference in the flow that hydraulic oil comes and goes to the piston, thereby it is different that its damping force when reciprocating motion has caused the piston rod, to the passenger, there is the difference in damping effect when its concrete impression jolts about for the automobile body, it can cause the damage of automobile body even jolting comparatively seriously to have influenced and take the travelling comfort. Therefore, when the piston is designed, the value of the damping force during the restoration of the piston needs to be adjusted to make up for the defects caused by different reciprocating oil amounts during the reciprocating motion of the piston. The traditional adjusting mode generally adopts the mode of adjusting the viscosity of hydraulic oil or adjusting the sectional area of a piston damping hole to realize the adjustment of the damping force value of the piston, but the damping force value cannot be accurately set when the piston is restored in the traditional adjusting mode, so that the vibration reduction effect of the piston is influenced.

In order to overcome the defects in the prior art, the application date is 2019, 4, 3, the application number is 201910266696.5, and the Chinese patent with the patent name of 'a damping-adjustable hydraulic damping piston and hydraulic damper' proposes a technical scheme.

However, the following defects are found in the practical implementation of the technical scheme: when the instant noise generated by the joint of the movable piston and the original piston body is large, the defect is particularly obvious when the piston is in a working state with high frequency and low stroke (when an automobile is in a long-distance low-slight-vibration road section), and the driving experience of passengers is seriously influenced.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the hydraulic damping piston and the hydraulic damper have the advantages that the defects in the prior art are overcome, the silencing mechanism is arranged between the movable piston and the fixed piston, the movable piston and the fixed piston are buffered when being attached, the noise generated when the movable piston and the fixed piston are attached is effectively eliminated, and the driving experience is improved.

The utility model provides a technical scheme that its technical problem adopted is: the low-noise damping adjustable hydraulic vibration damping piston comprises a piston cylinder filled with hydraulic oil, wherein a fixed piston is arranged in the piston cylinder, one end of a piston rod is connected with one end of the fixed piston and is led out from an end opening of the piston cylinder, the piston rod drives the fixed piston to reciprocate in the piston cylinder, a movable piston is sleeved on the outer ring of the piston rod, the movable piston and the fixed piston are respectively in sliding connection with the inner wall of the piston cylinder, and a circulation channel is arranged on the inner wall of the piston cylinder; the method is characterized in that: a silencing mechanism is arranged between the movable piston and the fixed piston, and the silencing mechanism is sleeved on the outer ring of the piston rod and moves along the axial direction of the piston rod.

Preferably, the silencing mechanism comprises an upper gasket and a lower gasket which are sequentially stacked up and down, wherein the diameter of the upper gasket is larger than that of the lower gasket.

Preferably, the bottom surface of the movable piston is provided with a circular extrusion groove, and the diameter of the extrusion groove is larger than that of the lower gasket and smaller than that of the upper gasket.

Preferably, at least one group of silencing mechanisms is arranged.

Preferably, the circulation channel is axially arranged along the piston cylinder, the circulation channel is a straight groove with uniform width, the circulation channel is provided with a plurality of circulation channels, the plurality of circulation channels are uniformly distributed along the circumferential direction of the piston cylinder, and the plurality of circulation channels are different in axial length; the central lines of the plurality of flow channels in the circumferential direction of the piston cylinder are positioned on the same circumference.

Preferably, a stop table for limiting the movable piston is fixed on the piston rod and is positioned on the outer side of the movable piston.

Preferably, the movable piston is provided with a piston flow through hole which axially penetrates through the movable piston, and the piston flow through hole is formed in an inner ring of the noise elimination mechanism.

Preferably, the lower gasket is provided with a plurality of grooves or/and through holes penetrating through the upper end surface and the lower end surface of the lower gasket.

The utility model provides a hydraulic press with adjustable low noise damping which characterized in that: the outer side of the piston cylinder is hermetically sleeved with an outer vibration absorber cylinder, an outer oil cavity of the vibration absorber is formed between the outer vibration absorber cylinder and the piston cylinder at intervals, and the bottom of the piston cylinder is communicated with the outer vibration absorber cylinder.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

1. in the low-noise hydraulic vibration damping piston with adjustable damping and the hydraulic vibration damper, the silencing mechanism is arranged between the movable piston and the fixed piston, and the movable piston and the fixed piston are buffered when being attached, so that the noise generated when the movable piston and the fixed piston are attached is effectively eliminated, and the driving experience is improved.

2. In the low-noise damping adjustable hydraulic vibration damping piston, the movable piston is arranged, and the length of the throttling channel is increased by the fit of the movable piston and the fixed piston when the piston is restored, so that the damping force value when the piston is restored is increased, and the defect caused by different oil amounts of reciprocating circulation when the piston reciprocates is overcome.

3. In the low-noise damping adjustable hydraulic vibration damping piston, the flow passage is arranged, so that the piston body realizes throttling when moving greatly, and the vibration damping effect is slowed down.

4. The thicknesses of the movable piston and the fixed piston can be set at will, so that the length of the throttling channel can be accurately adjusted, and the damping force value can be accurately adjusted.

Drawings

Fig. 1 is a schematic structural diagram of a low-noise damping adjustable hydraulic damping piston in an embodiment 1.

Fig. 2 is a sectional view taken along a line a-a in fig. 1.

Fig. 3 is a sectional view taken along the line B-B in fig. 1.

Fig. 4 is a structural schematic diagram of a low-noise damping adjustable hydraulic shock absorber.

FIGS. 5 to 6 are schematic views showing the fluid flow in the compression process of the low-noise damping adjustable hydraulic vibration-damping piston.

FIGS. 7 to 8 are schematic views showing the fluid circulation in the recovery process of the low-noise damping adjustable hydraulic damping piston.

Fig. 9 is an enlarged view of fig. 7 at a.

Wherein: 1. the piston rod 2, keep off platform 3, movable piston 4, upper gasket 5, lower gasket 6, fixed piston 7, piston cylinder 8, piston flow through hole 9, extrusion groove 10, circulation passageway 11, shock absorber urceolus.

Detailed Description

Fig. 1 to 9 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 9.

Example 1:

as shown in fig. 1, the low-noise damping adjustable hydraulic vibration damping piston includes a piston cylinder 7, the piston cylinder 7 is a cylinder with two closed ends, an inner cavity of the piston cylinder 7 is a piston cavity, and hydraulic oil is filled in the piston cavity. Be provided with the piston in the piston chamber and do 1, be fixed with fixed piston 6 in the bottom of piston rod 1, still overlap in the outer lane of piston rod 1 and be equipped with movable piston 3, movable piston 3 and piston rod 1 swing joint, movable piston 3 and fixed piston 6 all are located the piston chamber and respectively with the inside in close contact with of piston chamber. The other end of the piston rod 1 is led out from any end of the piston cylinder 7, and the fixed piston 6 is driven by the piston rod 1 to reciprocate in the piston cavity. The piston rod 1 is further provided with a blocking platform 2, the blocking platform 2 is located on the outer side of the movable piston 3, and when the movable piston 3 and the piston rod 1 move axially relative to each other, the blocking platform 2 limits the movable piston 3.

As shown in fig. 2, a plurality of flow channels 10 are formed in the inner wall of the piston cylinder 7, the flow channels 10 are straight grooves formed in the axial direction of the piston cylinder 7, and the length, width, and depth of the flow channels 10 are the same. The center lines of all the flow passages 10 in the circumferential direction of the piston cylinder 7 are located on the same circumference, and this circumference is defined as the initial position of the stationary piston 6

A set of shims is placed from top to bottom above the stationary piston 6: upper gasket 4 and lower gasket 5, the diameter of upper gasket 4 is greater than the diameter of lower gasket 5. The piston rod 1 simultaneously passes through the upper gasket 4 and the lower gasket 5, and the upper gasket 4 and the lower gasket 5 can respectively slide up and down along the piston rod 1.

Referring to fig. 3, a circular extrusion groove 9 is formed at the bottom of the movable piston 3, and the diameter of the extrusion groove 9 is larger than that of the lower gasket 5 and smaller than that of the upper gasket 4. A plurality of piston circulation holes 8 are further formed in the movable piston 3, the piston circulation holes 8 are formed in the inner side of the extrusion groove 9, and the piston circulation holes 8 penetrate through the upper end face and the lower end face of the movable piston 3.

As shown in fig. 4, a damper outer cylinder 11 is sleeved outside the piston cylinder 7 to form a hydraulic damper with adjustable damping, at this time, the piston cylinder 7 is used as an inner cylinder of the damper, an upper port of the damper outer cylinder 11 is hermetically arranged with the piston cylinder 7, an outer oil cavity of the hydraulic damper is formed between the damper outer cylinder 11 and the piston cylinder 7 at intervals, the piston cavity in the piston cylinder 7 becomes an inner oil cavity of the hydraulic damper, and a conventional through hole or a valve body is arranged at the bottom of the piston cylinder 7 to realize communication between the inner oil cavity and the outer oil cavity.

When the vehicle body is subjected to vibration reduction, the low-noise damping adjustable hydraulic vibration reduction piston can be independently realized, and the damping adjustable hydraulic vibration reduction piston can also be realized by using the damping adjustable hydraulic vibration reducer.

The specific working process and working principle are as follows:

the piston rod 1 and the piston cylinder 7 are respectively fixed at the automobile body and the wheel assembly of the automobile, when the automobile body and the wheel float up and down, the piston rod 1 and the piston cylinder 7 move relatively, as shown in fig. 5-6, when the piston compresses, the fixed piston 6 extends into the piston cavity under the pushing of the piston rod 1, at the moment, the movable piston 3 and the piston rod 1 move relatively and are far away from the fixed piston 6, due to the arrangement of the baffle table 2, when the movable piston 3 moves to the baffle table 2, the movable piston stops moving, and if the piston rod 1 continues to extend into the piston cavity at the moment, the movable piston 3 can move synchronously with the fixed piston 6 under the pushing of the baffle table 2.

When the automobile body and the wheel assembly slightly vibrate, hydraulic oil in the piston cavity can flow in the two sides of the fixed piston 6/the movable piston 3 in a reciprocating mode through the flow channel 10 and the piston flow through hole 8, the oil flows smoothly at the moment, the generated damping force value is small, and the comfort level is improved.

When the piston is compressed at the highest speed due to large vibration between the automobile body and the wheel assembly, the fixed piston 6 can move to the lower part of the circulation channel 10, the lower port of the circulation channel 10 is plugged by the fixed piston 6 at the moment, oil below the fixed piston 6 cannot quickly circulate to the upper part, the pressure of the lower part becomes large, and a large compression force value is generated, so that the controllability of the automobile is guaranteed.

As shown in fig. 7, when the piston rod 1 is restored, the fixed piston 6 is driven by the piston rod 1 to be close to the movable piston 3, and because the upper gasket 4 and the lower gasket 5 are further arranged between the movable piston 3 and the fixed piston 6, the movable piston 3, the lower gasket 5, the upper gasket 4 and the movable piston 3 are sequentially attached to each other. Meanwhile, the diameter of the upper gasket 4 is larger than that of the extrusion groove 9, so that after the upper gasket 4 is attached to the movable piston 3, the bottom end of the extrusion groove 9 is plugged, and meanwhile, the lower port of the piston circulation hole 8 is indirectly plugged, so that hydraulic oil does not circulate through the piston circulation hole 8 any more in the process of restoring the piston rod 1.

Referring to fig. 9, since the diameter of the lower gasket 5 is smaller than the diameter of the upper gasket 4, a gap is formed in the outer ring of the lower gasket 5 by the gap effect of the lower gasket 5, and thus, after the movable piston 3 is attached to the upper gasket 4, the outer ring of the extrusion groove 9 extrudes the upper gasket 4 to deform the upper gasket, and thus, a certain buffering effect is exerted on the movable piston 3 by the deformation of the upper gasket 4. Because the outer lane at lower gasket 5 is formed with the clearance, and hydraulic oil is full of piston cylinder 5, consequently when movable piston 3 extrudes gasket 4 and makes it take place deformation, can outwards extrude the hydraulic oil in the 5 outer lane clearances of lower gasket simultaneously, and hydraulic oil is extruded the back and is flowed out via circulation passageway 10, and the in-process of hydraulic oil being extruded has played the effect of secondary buffering to movable piston 3. Through set up gasket 4 and lower gasket 5 between movable piston 3 and fixed piston 6, when piston rod 1 recovers, played the cushioning effect between movable piston 3 and the fixed piston 6, noise when effectively avoiding movable piston 3 and the direct laminating of fixed piston 6, improved experience by bus.

Further referring to fig. 8, the inner wall of the piston cylinder 5 gradually seals the piston flow through hole 8, so that the flow length of the hydraulic oil gradually increases, which has the effect of gradually increasing the restoring damping of the piston when the piston is restored, when the movable piston 3 is completely located above the flow channel 10, the fixed piston 6 gradually moves to the upper side of the flow channel 10, and the restoring damping force of the piston reaches the maximum value, so that the damping force when the piston is restored can be set by setting the lengths of the movable piston 3 and the fixed piston 6 and the position of the flow channel 10.

Example 2:

this example differs from example 1 in that: in this embodiment, the flow passage 10 is not designed as a straight groove along the axial direction of the piston cylinder inner cylinder 8, but as a through groove with a wide middle part and gradually narrowed two ends, when the fixed piston 6 gradually moves, the flow passage 10 gradually narrows, so that the effect of smaller hydraulic oil flow area is achieved, and the vibration damping degree is further reduced.

In this embodiment, the flow channels 10 may have the same length or different lengths.

Example 3:

this example differs from example 1 in that: in this embodiment, the upper and

lower spacers

4 and 5 are stacked and a plurality of sets are disposed between the movable piston 3 and the fixed piston 6.

Example 4:

this example differs from example 1 in that: in this embodiment, the lower pad 5 is provided with a plurality of grooves (blind holes) or/and through holes penetrating the upper and lower end surfaces thereof, thereby achieving the effect of eliminating noise to a certain extent.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A low-noise damping adjustable hydraulic vibration reduction piston comprises a piston cylinder (7) filled with hydraulic oil, wherein a fixed piston (6) is arranged in the piston cylinder (7), one end of a piston rod (1) is connected with the fixed piston (6), the other end of the piston rod is led out from the port of the piston cylinder (7), the piston rod (1) drives the fixed piston (6) to reciprocate in the piston cylinder (7), a movable piston (3) is sleeved on the outer ring of the piston rod (1), the movable piston (3) and the fixed piston (6) are respectively in sliding connection with the inner wall of the piston cylinder (7), and a circulation channel (10) is arranged on the inner wall of the piston cylinder (7); the method is characterized in that: a silencing mechanism is arranged between the movable piston (3) and the fixed piston (6), and the silencing mechanism is sleeved on the outer ring of the piston rod (1) and moves along the axial direction of the piston rod (1).

2. The low noise, damping adjustable hydraulic damping piston of claim 1, wherein: the silencing mechanism comprises an upper gasket (4) and a lower gasket (5) which are sequentially stacked up and down, wherein the diameter of the upper gasket (4) is larger than that of the lower gasket (5).

3. The low noise, damping adjustable hydraulic damping piston of claim 2, wherein: the bottom surface of the movable piston (3) is provided with an extrusion groove (9), the extrusion groove (9) is circular, and the diameter of the extrusion groove is larger than that of the lower gasket (5) and smaller than that of the upper gasket (4).

4. The low noise damping adjustable hydraulic damping piston according to claim 1 or 2, characterized in that: the silencing mechanism is at least provided with one group.

5. The low noise, damping adjustable hydraulic damping piston of claim 1, wherein: the circulation channel (10) is axially arranged along the piston cylinder (7), the circulation channel (10) is a straight groove with uniform width, the circulation channel (10) is provided with a plurality of circulation channels, the circulation channels (10) are uniformly distributed along the circumferential direction of the piston cylinder (7), and the axial lengths of the circulation channels (10) are different; the central lines of the plurality of flow channels (10) in the circumferential direction of the piston cylinder (7) are positioned on the same circumference.

6. The low noise, damping adjustable hydraulic damping piston of claim 1, wherein: the piston rod (1) is fixed with a baffle table (2) for limiting the movable piston (3), and the baffle table (2) is positioned on the outer side of the movable piston (3).

7. The low noise, damping adjustable hydraulic damping piston of claim 1, wherein: the movable piston (3) is provided with a piston circulation hole (8) which axially penetrates through, and the piston circulation hole (8) is arranged on an inner ring of the noise elimination mechanism.

8. The low noise, damping adjustable hydraulic damping piston of claim 2, wherein: the lower gasket (5) is provided with a plurality of grooves or/and through holes penetrating through the upper end surface and the lower end surface of the lower gasket.

9. A hydraulic damper made by using the low-noise damping adjustable hydraulic damping piston as claimed in any one of claims 1 to 8, wherein: the outer side of the piston cylinder (7) is hermetically sleeved with an outer shock absorber cylinder (11), an outer oil cavity of the shock absorber is formed between the outer shock absorber cylinder (11) and the piston cylinder (7) at intervals, and the bottom of the piston cylinder (7) is communicated with the outer shock absorber cylinder (11).