CN208858842U

CN208858842U - A dynamic shock absorber with adjustable damping

Info

Publication number: CN208858842U
Application number: CN201821424680.XU
Authority: CN
Inventors: 高燕; 上官文斌; 赵学智
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2019-05-14
Anticipated expiration: 2028-08-31

Abstract

The utility model discloses a kind of adjustable dynamic vibration absorbers of damping, including cabinet and Box Cover, piston and piston rod, liquid medium is injected in the cylinder body, the centre bore that separate piston one end of the piston rod passes through Box Cover is fixedly connected with mass block, the rod end and rear end of the piston are fixedly installed the upper helical spring being connected with cylinder body both ends inner wall and lower helical spring respectively, between the rod end of the piston and upper helical spring, the upper damping connecting plate and lower damping connecting plate being slidably matched with cabinet wall are coaxially disposed between rear end and lower helical spring respectively, the upper damping connecting plate, circle on lower damping connecting plate and piston along same diameter is circumferentially evenly arranged with several damping holes, the upper damping connecting plate, it can be relatively rotated around axis between lower damping connecting plate and piston.The utility model can provide biggish damping, good damping result, and damping and intrinsic frequency are adjustable, and structure is simple, compact, convenient disassembly.

Description

A kind of adjustable dynamic vibration absorber of damping

Technical field

The utility model relates to a kind of bump leveller more particularly to a kind of adjustable dynamic vibration absorbers of damping.

Background technique

There is vibration that will generate noise, nuisance vibration can cause product and structure premature breakdown, reduce the service life, even Jeopardize the health and safety of people.The NVH performance of passenger car has been to be concerned by more and more people at present, and dynamic formula power is inhaled Vibration device because its structure is simple, convenient disassembly due to be widely used in the noise-and-vibration-reduction of automobile partial structurtes, such as it is steering wheel, outstanding It sets, subframe, drive shaft, transmission shaft and exhaust pipe etc..

Dynamic vibration absorber belongs to single-degree-of-freedom shock absorption system, be it is a kind of using resonance system absorb object vibrational energy with The device for reducing object vibration, after additional power bump leveller, main system generates two apart from close near its intrinsic frequency Formant, absorbing frequency band is very narrow, and when extraneous frequency changes, effectiveness in vibration suppression can have a greatly reduced quality.Certain damping is added, It can effectively reduce two formants near absorbing frequency, widen its absorbing frequency band.

Bump leveller common at present is composed of rubber and mass block, and rubber can provide certain structural damping, but Damp it is still smaller, to a bump leveller structure, damping ratio be it is fixed, cannot thus meet people's difference well Demand.

Utility model content

Purpose of the utility model is to solve the damping of passive type dynamic vibration absorber, small and nonadjustable problem, is designed A adjustable dynamic vibration absorber of damping, structure is simple, good damping result, vibration damping bandwidth.

The technical scheme adopted by the utility model to solve the technical problem is as follows:

The adjustable dynamic vibration absorber of a kind of damping, including forming the cabinet of sealed cylinder block and Box Cover, matching with cylinder body Piston and piston rod, liquid medium is injected in the cylinder body, separate piston one end of the piston rod passes through the cabinet The centre bore of lid is fixedly connected with mass block, and the rod end and rear end of the piston are fixedly installed and the cylinder body two respectively End the inner wall upper helical spring and lower helical spring that are connected, between the rod end of the piston and upper helical spring, rear end Be coaxially disposed respectively between lower helical spring in the circle being slidably matched with the cabinet wall damp connecting plate and under Connecting plate is damped, the upper damping connecting plate, the lower circle damped on connecting plate and piston along same diameter are circumferentially uniformly arranged There are several damping holes, the upper damping connecting plate can relatively rotate between lower damping connecting plate and piston around axis.

Preferably, the cabinet is connected with Box Cover by screw thread or flange seal；Alternatively, the opening of the cabinet It is provided with annular groove, being provided on one side for the opening of the relatively described cabinet of the Box Cover is matched with the annular groove interference The annular protrusion of conjunction.

Preferably, the piston rod is provided with the external screw thread for quality of connection block far from piston one end.

Preferably, the piston rod is additionally provided with and the plane or vertical of spanner cooperation far from the circumferential wall of piston one end The blind hole of axis, being inserted into shaft by spanner or in blind hole can be rotated piston.

Preferably, being provided with one immediately below the plane or blind hole for marking the instruction of piston rotation angle Line, the cabinet exterior surface are provided with corresponding angle groove.

Preferably, being provided with the seal member with the piston rod axial seal, institute in the centre bore of the Box Cover Stating seal member is sealing ring or rubber coating, and the lower end of the rubber coating is higher than Box Cover lid surface, and protrusion Outside is the conical surface.

Preferably, being provided with the sky for making the centre bore be divided into two coaxial central bores in the middle part of the Box Cover Chamber is provided with the seal member with the piston rod axial seal, the seal member in two coaxial central bores For sealing ring or rubber coating, the lower end of the rubber coating is higher than Box Cover lid surface, and is the conical surface on the outside of protrusion. The cavity of the Box Cover is used to collect piston rod and moves back and forth the liquid taken out of.

Preferably, the rod aperture of the upper damping connecting plate being provided centrally with the piston rod clearance fit, The diameter of the rod aperture is greater than the piston rod outer diameter and is less than helical spring path, and passing through convenient for piston rod simultaneously can be freely Rotation and connection helical spring；The circumference that the upper damping connecting plate, lower damping connecting plate and cabinet internal perisporium are slidably matched It is provided with small boss on face, the axially disposed rotation stop groove having with small boss sealing cooperation on the cabinet internal perisporium, Two match to guarantee that two damping connecting plates are not rotated with piston rotation.

Preferably, the upper damping connecting plate, lower damping connecting plate respectively with the upper helical spring, lower spiral bullet Spring is by welding or is adhesively fixed connected.

Preferably, being separately provided for fixing close to the side of cabinet with the Box Cover on the inside of the bottom of box The groove of lower helical spring and upper helical spring.

Compared with prior art, the utility model has the beneficial effects that

This dynamic vibration absorber can design the size of damping ratio according to demand, and damping ratio is adjustable, good damping result, vibration damping Bandwidth is able to satisfy different demands, while the structural natural frequencies are adjustable, simple and compact for structure, convenient disassembly.

Detailed description of the invention

Fig. 1 is the integrally-built semi-cutaway of the utility model embodiment；

Fig. 2 is the piston of the utility model embodiment and the structural schematic diagram of piston rod；

Fig. 3 is the structural schematic diagram of the upper damping connecting plate of the utility model embodiment；

Fig. 4 is the partial enlarged view of rubber coating in the overall structure sectional view of the utility model embodiment；

Fig. 5 is the cabinet and Box Cover cooperation schematic diagram of the utility model embodiment；

Fig. 6 is the cabinet schematic top plan view of the utility model embodiment；

Fig. 7 is the cabinet schematic cross-sectional view of the utility model embodiment.

Attached drawing mark explanation: 1, mass block；2, piston rod；3, rubber coating；4, Box Cover；5, upper helical spring；6, on Damp connecting plate；6-1, damping hole；6-2, rod aperture；6-3, small boss；7, piston；8, lower damping connecting plate；9, lower spiral Spring；10, cabinet.

Specific embodiment

Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.

As shown in Figure 1, a kind of adjustable dynamic vibration absorber of damping, including form sealed cylinder block cabinet 10 and Box Cover 4, The piston 7 and piston rod 2 matched with cylinder body is injected with liquid medium, the separate piston one of the piston rod 2 in the cylinder body Hold and be fixedly connected across the centre bore of the Box Cover 4 with mass block 1, be provided in the centre bore of the Box Cover 4 with it is described The seal member of 2 axial seal of piston rod, the seal member are sealing ring or rubber coating 3, the lower end of the rubber coating 3 It higher than 4 lid surface of Box Cover, and is the conical surface on the outside of protrusion.Fixation is set the rod end and rear end of the piston 7 respectively Be equipped with the upper helical spring 5 being connected with cylinder body both ends inner wall and lower helical spring 9, the rod end of the piston 7 with it is upper Between helical spring 5, it has been coaxially disposed between rear end and lower helical spring 9 and has been slidably matched with 10 inner wall of cabinet respectively Circle on damp connecting plate 6 and lower damping connecting plate 8, the upper helical spring 5 and lower helical spring 9 respectively with upper damping company Fishplate bar 6 and lower damping connecting plate 8 are welded and fixed, along identical straight on the upper damping connecting plate 6, lower damping connecting plate 8 and piston 7 The circle of diameter is circumferentially evenly arranged with several damping holes, can between the upper damping connecting plate 6, lower damping connecting plate 8 and piston 7 It is relatively rotated around axis.

In the present embodiment, liquid medium is added in the confined space that the Box Cover 4 and cabinet 10 form, it is such as hydraulic This closed space is divided into two cavitys up and down by oil, the piston 7 and upper damping connecting plate 6, lower damping connecting plate 8, Under the action of upper helical spring 5 and lower helical spring 9, the piston 7 and upper damping connecting plate 6, lower damping connecting plate 8 are at this Axially reciprocating is done in a confined space, the volume of upper and lower cavities then constantly changes, so that liquid medium be made constantly to flow The damping hole 6-1 crossed on piston 7 and upper damping connecting plate 6, lower damping connecting plate 8 is lived to generate larger damping by selection Plug 7 changes a relative position of damping hole 6-1, i.e., the size of conveniently adjusted damping.

As shown in Fig. 2, the piston rod 2 is machined with external screw thread far from one end of piston 7, it is used for quality of connection block 1, is used The mass block 1 of this connection type, conveniently replaced different size meets the needs of different to change its intrinsic frequency.Outside Have a blind hole below the bottom of thread, the rotation of piston 7 can be realized in insertion shaft, so as to adjust upper damping connecting plate 6, under Damp the folding situation of damping hole 6-1 on connecting plate 8.Angled groove is arranged in 4 outer surface of Box Cover, blind hole just under Draw an index line matched with the angle groove, the angle for marking piston 7 to rotate through in side.The piston 7 it is upper Be evenly distributed six equal-sized damping hole 6-1, when six damping hole 6-1 completely with upper damping connecting plate 6, lower damping When damping hole 6-1 on connecting plate 8 is aligned, the damping of the bump leveller is minimum, and with the rotation of piston 7, damping hole 6-1 is gradually closed It closes, damping is also gradually increased.

As shown in figure 3, being machined with damping hole 6-1 on the upper damping connecting plate 6, the quantity and diameter of damping hole can It is adjusted according to actually required damping, the diameter of intermediate rod aperture 6-2 is greater than the diameter of piston rod 2, but is less than upper spiral shell Revolve spring 5 internal diameter, in this way can guarantee piston rod 2 can without frictionally pass through and meanwhile go up 5 company of being capable of fixing of helical spring It connects above.

As shown in Figure 1 and Figure 4, the middle part of the Box Cover 4, which is provided with, makes the centre bore be divided into two coaxial centers The cavity in hole is provided with the seal member with 2 axial seal of piston rod in two coaxial central bores, described close Envelope component is rubber coating 3, is located in centre bore by vulcanization, is taken out of from cabinet 10 on piston rod 2 for sealing and wiping Liquid.The lower end of the rubber coating 3 is higher than 4 lid surface of Box Cover, and is the conical surface on the outside of protrusion, can remove piston Residual liquid on bar 2.

As shown in figure 5, the opening of the cabinet 10 is provided with annular groove, the relatively described cabinet 10 of the Box Cover 4 Opening be provided on one side with the annular groove interference fit annular protrusion, have good leakproofness.

As shown in Figure 3 and Figure 6, it is set on the circumference side that the upper damping connecting plate 6 is slidably matched with 10 internal perisporium of cabinet It is equipped with small boss 6-3, is exactly fitted in rotation stop groove axially disposed on 10 internal perisporium of cabinet, to guarantee to damp Connecting plate is not rotated with piston 7 and is rotated.The structure and upper 6 structure of damping connecting plate shown in Fig. 3 of the lower damping connecting plate 8 Similar, difference is that the center of lower damping connecting plate 8 does not have rod aperture.

10 bottom inside of cabinet and the Box Cover 4 are separately provided for fixing lower spiral close to the side of cabinet The groove of spring 9 and upper helical spring 5, and 10 bottom outside surrounding of the cabinet is then equipped with boss, and is machined with mounting hole, just On the master system in installation, see Fig. 7.

The utility model utilizes the working principle of damping hole, i.e., when gas or liquid pass through from thick pipeline, due to extra heavy pipe It is mounted with aperture or micropore among road, slows down fluid flow rate, flow reduces, and damping action is played, then by adjusting damping The quantity and diameter in hole adjust the damping ratio of bump leveller, meet the needs of different operating conditions.

Embodiment described above is a kind of preferable scheme of the utility model, is not made to the utility model any Formal limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.

Claims

1. A dynamic vibration absorber with adjustable damping, comprising a box (10) and a box cover (4) forming a sealed cylinder, a piston (7) and a piston rod (2) matched with the cylinder, the A liquid medium is injected into the cylinder, the end of the piston rod (2) away from the piston passes through the central hole of the box cover (4) and is fixedly connected to the mass block (1), and the piston (7) has a rod The upper coil spring (5) and the lower coil spring (9) connected to the inner walls of the two ends of the cylinder are respectively fixed at the end and the non-rod end, and are characterized in that:

Between the rod end of the piston (7) and the upper coil spring (5), and between the rodless end and the lower coil spring (9), there are respectively coaxially provided with sliding fittings with the inner wall of the box body (10). A circular upper damping connecting plate (6) and a lower damping connecting plate (8), the upper damping connecting plate (6), the lower damping connecting plate (8) and the piston (7) are uniformly arranged along the circumference of the same diameter There are several damping holes, and the upper damping connecting plate (6), the lower damping connecting plate (8) and the piston (7) can rotate relative to each other around the axis.

2. The dynamic vibration absorber with adjustable damping according to claim 1, characterized in that: the box body (10) and the box body cover (4) are sealedly connected by threads or flanges; 10) An annular groove is provided at the opening, and a surface of the box cover (4) opposite to the opening of the box body (10) is provided with an annular protrusion that interferes with the annular groove.

3 . The dynamic vibration absorber with adjustable damping according to claim 1 , wherein the end of the piston rod ( 2 ) away from the piston ( 7 ) is provided with an external thread for connecting the mass ( 1 ). 4 .

4. The dynamic vibration absorber with adjustable damping according to claim 1, characterized in that: the circumferential wall of one end of the piston rod (2) away from the piston (7) is also provided with a blind plane or vertical axis that cooperates with the wrench. hole.

5. The dynamic vibration absorber with adjustable damping according to claim 4, characterized in that: an indicator line for marking the rotation angle of the piston (7) is provided directly below the plane or blind hole, and the box The outer surface of the body cover (4) is provided with corresponding angle scribe lines.

6 . The dynamic vibration absorber with adjustable damping according to claim 1 , characterized in that: the central hole of the box cover ( 4 ) is provided with a sealing member that is axially sealed with the piston rod ( 2 ), The sealing member is a sealing ring or a rubber coating (3), the lower end of the rubber coating (3) is higher than the surface of the cover plate of the box cover (4), and the outer side of the protruding part is a tapered surface.

7. The dynamic vibration absorber with adjustable damping according to claim 6, characterized in that: the middle of the box cover (4) is provided with a cavity for dividing the central hole into two coaxial central holes, Both of the two coaxial central holes are provided with a sealing member that is axially sealed with the piston rod (2), the sealing member is a sealing ring or a rubber coating (3), and the rubber coating (3) ) has a lower end higher than the surface of the cover plate of the box cover (4), and the outside of the protruding part is a tapered surface.

8 . The dynamic vibration absorber with adjustable damping according to claim 1 , wherein the center of the upper damping connecting plate ( 6 ) is provided with a piston rod hole ( 6 that is clearance fit with the piston rod ( 2 ). 9 . -2), the diameter of the piston rod hole (6-2) is larger than the outer diameter of the piston rod (2) and smaller than the small diameter of the coil spring; the upper damping connecting plate (6), the lower damping connecting plate (8) and the Small bosses (6-3) are provided on the circumferential side surfaces of the inner peripheral wall of the box body (10) that are slidably fitted, and the inner peripheral wall of the box body (10) is axially provided with the small bosses (6-3) Anti-rotation groove for sealing fit.

9. The dynamic vibration absorber with adjustable damping according to claim 1, characterized in that: the upper damping connecting plate (6) and the lower damping connecting plate (8) are respectively connected with the upper coil spring (5), The lower coil springs (9) are fixedly connected by welding or bonding.

10. The dynamic vibration absorber with adjustable damping according to claim 1, characterized in that: the inner side of the bottom of the box body (10) and the side of the box body cover (4) close to the box body are respectively provided with for fixing The grooves of the lower coil spring (9) and the upper coil spring (5).