CN206449154U - Shock damper - Google Patents

Abstract

The utility model discloses a damper for shock absorption, which is characterized in that a two-way piston capable of reciprocating displacement with a cylinder body is arranged in the cylinder body filled with hydraulic oil, a mandrel relatively extending out of the cylinder body is connected on the two-way piston, at least one-way valve is arranged on the mandrel, a first oil return channel is arranged at the axis of the mandrel in a penetrating way, and a first valve rod is arranged at the first oil return channel of the mandrel; under the action of the one-way valve, another channel allowing hydraulic oil to pass through the two-way piston in one direction is formed, so that the wheel can generate better ground gripping performance, and the flow of the hydraulic oil passing through the one-way valve can be controlled in a mode of simply adjusting the relative position of the first valve rod outside the cylinder body if necessary under the condition of not changing factory setting, so that the aim of quickly adjusting the damping flow rate ratio of the shock-absorbing damper during impact and rebound is fulfilled.

Description

Shock-absorbing damper

Technical field

The utility model is relevant with the suspension system of vehicle, it is desirable to provide vehicle suspension system one kind is available for convenient use person The shock-absorbing damper of adjustment damping flow velocity ratio.

Background technology

Press, the suspension system of vehicle is substantially connected with a spring and a damping between car body and the support body of installing wheel Device, the main metamorphosis using spring absorbs impact strength when being lifted on wheel, and when spring is by larger extension or pressure During contracting power, appropriate restraint can be given by damper, use buffering vibration, the rapid resonance for weakening spring and reduce spring because The danger for causing to destroy drastically is deformed, and the adherence properties of tire can be improved and avoids skidding, to improve travel safety and seating Comfortableness.

The damper that similar vehicles shock absorbing apparatus is commonly used is filled as shown in figure 1, being filled with one in the cylinder body 11 of hydraulic oil If one can be back and forth the bidirectional piston 12 moved with the cylinder body 11, the core of the relative extension cylinder body 11 is connected on the bidirectional piston 12 Axle 13, as the cylinder body 11 and the mandrel 13 respectively with the two ends of spring 20 corresponding to mechanical body (figure is omited) be connected, the two-way work Plural spill port 121 is offered on plug 12, limiting hydraulic oil by way of the bidirectional piston 12 using spill port 121 produces resistance Buddhist nun acts on.

And, further it can be respectively mounted in the top surface of the bidirectional piston 12 and bottom surface provided with an at least throttle sheet 122, Among total spill port 12, the spill port 12 for having predetermined amount is set by it in one end of the top surface of bidirectional piston 12 Covered by throttle sheet 122, the spill port 121 of other quantity be then set by its bottom surface of bidirectional piston 12 one end by throttle Piece 122 covers, and using the quantity of throttle sheet 122 set by the top surface and bottom surface for changing the bidirectional piston 12, changes spring 20 Damping flow velocity ratio when impact and resilience.

Furthermore, some vehicles are met in actual use, unavoidably because car body mass (load-carrying) change, the custom of driver Different or different track conditions and the demand that shock absorbing apparatus damps flow velocity ratio must be changed；Due to above taking off to keep away and commonly using damping Device is installed on the top surface of bidirectional piston 12 or the throttle sheet 122 of top surface is mothballed in cylinder body 11 together with bidirectional piston 12, its The performance requirement of vehicle must be applied according to it before dispatching from the factory, low flow rate impact damping, low flow rate resilience is configured to The product of the different damping flow velocity ratios such as damping, high flow rate impact damping or high flow rate resilience damping, user can not regard actual Demand voluntarily adjusts damping flow velocity ratio, still is apparent not enough for practicality and applicability.

Utility model content

The technical problem that the utility model is solved is providing vehicle suspension system a kind of convenient use person's adjustment damping The shock-absorbing damper of flow velocity ratio.

The technological means that the utility model is used is as described below.

A kind of shock-absorbing damper is provided, being substantially filled with the cylinder body of hydraulic oil installing one one can be reciprocal with the cylinder body The bidirectional piston of displacement, is offered in being set on the mandrel that the relative extension cylinder body is connected on the bidirectional piston, the bidirectional piston Plural first spill port；It is characterized in that：The shock-absorbing damper is provided with an at least check valve in the mandrel, and this is at least one unidirectional One first is provided at the second spill port that valve is only capable of discharging in the same direction provided with least one limitation hydraulic oil, the axle center of the mandrel Drainback passage；It is another to there is one first valve rod to be in be available for the kenel for changing itself and the mandrel relative position to be installed in first time of the mandrel At oily passage；The mandrel and its correspond to first valve rod preset at stroke provided with least one constitute first oil return The first valve opening that passage is communicated with the second spill port of an at least check valve.

Utilize said structure feature, shock-absorbing damper of the present utility model, in use, using set on bidirectional piston The first spill port opened up limits hydraulic oil and damping action is produced by way of bidirectional piston；And, can check valve work Under, form another and make hydraulic oil unidirectional by the passage of bidirectional piston, allow wheel to produce preferably adherence properties, and can be Do not change in the state of factory setting, the mode of the relative position of the first valve rod of simple adjustment outside cylinder body passed through if necessary, Change the degree (flow of the control hydraulic oil by check valve) that the first valve rod covers the first valve opening, and then reach adjustment shock-absorbing Damper damps the purpose of flow velocity ratio when impact and resilience.

According to said structure feature, described first valve rod provides a valve through hole at its axle center, separately there is one second valve rod The valve through hole is installed in the kenel for being available for changing itself and the first valve rod relative position, the bidirectional piston is provided with plural number point The by-pass prot that respectively first spill port is communicated with the mandrel is not constituted, and the mandrel corresponds to presetting for second valve rod at it At stroke the second valve opening that first drainback passage is communicated with the by-pass prot of the bidirectional piston, second valve rod are constituted provided with plural number Above and provided with least one for constituting the second valve opening and the first valve opening of the mandrel it is able to the second drainback passage connected.

According to said structure feature, described first valve rod is installed in the of the mandrel with the kenel with the mandrel bolt At one drainback passage.

According to said structure feature, described first valve rod is installed in the of the mandrel with the kenel with the mandrel bolt At one drainback passage, one end of first valve rod and the mandrel is correspondingly stretched out, separately in the first valve rod relative extension mandrel Spiral shell is provided with one first hold-doun nut at section.

According to said structure feature, described first valve rod provides a valve through hole at its axle center, separately there is one second valve rod The valve through hole is installed in the kenel for being available for changing itself and the first valve rod relative position, the bidirectional piston is provided with plural number point The by-pass prot that respectively first spill port is communicated with the mandrel is not constituted, and the mandrel corresponds to presetting for second valve rod at it At stroke the second valve opening that first drainback passage is communicated with the by-pass prot of the bidirectional piston, second valve rod are constituted provided with plural number Above and provided with least one for constituting the second drainback passage that the second valve opening of the mandrel is communicated with the first valve opening；Second valve rod with The valve through hole of first valve rod is installed in the kenel of the first valve rod bolt.

According to said structure feature, described first valve rod provides a valve through hole at its axle center, separately there is one second valve rod The valve through hole is installed in the kenel for being available for changing itself and the first valve rod relative position, the bidirectional piston is provided with plural number point The by-pass prot that respectively first spill port is communicated with the mandrel is not constituted, and the mandrel corresponds to presetting for second valve rod at it At stroke the second valve opening that first drainback passage is communicated with the by-pass prot of the bidirectional piston, second valve rod are constituted provided with plural number Above and provided with least one for constituting the second drainback passage that the second valve opening of the mandrel is communicated with the first valve opening；Second valve rod with The valve through hole of first valve rod, one end of second valve rod and correspondence stretching are installed in the kenel of the first valve rod bolt First valve rod, separately spiral shell is provided with one second hold-doun nut at the section of the second valve rod relative extension first valve rod.

According to said structure feature, described first valve rod provides a valve through hole at its axle center, separately there is one second valve rod The valve through hole is installed in the kenel for being available for changing itself and the first valve rod relative position, the bidirectional piston is provided with plural number point The by-pass prot that respectively first spill port is communicated with the mandrel is not constituted, and the mandrel corresponds to presetting for second valve rod at it At stroke the second valve opening that first drainback passage is communicated with the by-pass prot of the bidirectional piston, second valve rod are constituted provided with plural number Above and provided with least one for constituting the second valve opening and the first valve opening of the mandrel it is able to the second drainback passage connected；First valve Bar is installed at the first drainback passage of the mandrel with the kenel with the mandrel bolt, one end of first valve rod and is correspondingly stretched Go out the mandrel, separately spiral shell is provided with one first hold-doun nut at the section of the first valve rod relative extension mandrel；Second valve rod It is installed in the valve through hole of first valve rod with the kenel with the first valve rod bolt, one end of second valve rod and correspondingly stretches Go out first valve rod, separately spiral shell is provided with one second hold-doun nut at the section of the second valve rod relative extension first valve rod.

The top surface of the bidirectional piston and bottom surface are respectively mounted provided with an at least throttle sheet, in its first total oil return Among hole, the first spill port for having predetermined amount is set to be hidden by it in one end of the bidirectional piston top surface by throttle sheet Cover, the first spill port of other quantity is then set to be covered by it in one end of the bidirectional piston bottom surface by throttle sheet.

A described at least check valve is supplied the throttle sheet of respectively the second oil return maskaperture mask provided with least one.

The top surface of the bidirectional piston and bottom surface are respectively mounted provided with an at least throttle sheet, in its first total oil return Among hole, the first spill port for having predetermined amount is set to be hidden by it in one end of the bidirectional piston top surface by throttle sheet Cover, the first spill port of other quantity is then set to be covered by it in one end of the bidirectional piston bottom surface by throttle sheet；This is extremely A few check valve is supplied the throttle sheet of respectively the second oil return maskaperture mask provided with least one.

Technique effect produced by the utility model：The main design using check valve and the first valve rod, forms another Make hydraulic oil unidirectional by the passage of bidirectional piston, allow wheel to produce preferably adherence properties, and factory setting can not changed Under state, through the mode of the relative position of the first valve rod of simple adjustment outside cylinder body, quick adjustment shock-absorbing damper is in punching Hit and damping flow velocity ratio during resilience；Even, it is further transmitted through coordinating the mode of the relative position of the second valve rod of adjustment, reaches The strong and weak purpose of fine setting damping.

Brief description of the drawings

Fig. 1 is a lateral partial structurtes sectional view for commonly using damper.

Fig. 2 is the shock-absorbing damper lateral partial structurtes sectional view of the utility model first embodiment.

Fig. 3 for the utility model first embodiment shock-absorbing damper in adjust its first valve rod relative position after part Structure sectional view.

Fig. 4 is the shock-absorbing damper lateral partial structurtes sectional view of the utility model second embodiment.

Fig. 5 for the utility model second embodiment shock-absorbing damper in adjust its second valve rod relative position after part Structure sectional view.

Figure number explanation：

Prior art

11 cylinder bodies

12 bidirectional pistons

121 spill ports

122 throttle sheets

13 mandrels

20 springs

The utility model

31 cylinder bodies

32 bidirectional pistons

321 first spill ports

322 throttle sheets

323 by-pass prots

33 mandrels

331 first drainback passages

332 first valve openings

333 second valve openings

34 check valves

341 second spill ports

342 throttle sheets

35 first valve rods

351 valve through holes

36 second valve rods

361 second drainback passages

371 first hold-doun nuts

372 second hold-doun nuts.

Embodiment

The utility model mainly provides that vehicle suspension system is a kind of to be available for users to adjustment its resistance when impact and resilience The shock-absorbing damper of Buddhist nun's flow velocity ratio, as shown in Fig. 2 shock-absorbing damper of the present utility model, is substantially filled with hydraulic pressure one The bidirectional piston 32 that installing one can be with the shift reciprocately of cylinder body 31 in the cylinder body 31 of oil is relative in connection one on the bidirectional piston 32 The mandrel 33 of the cylinder body 31 is stretched out, is set on the bidirectional piston 32 and offers plural first spill port 321.

When implementing, the top surface of the bidirectional piston 32 and bottom surface are respectively mounted provided with an at least throttle sheet 322, at it Among the first total spill port 321, there is the first spill port 321 (first time in left side of such as figure middle position of predetermined amount Oilhole) it is set and is covered by it in one end of the top surface of bidirectional piston 32 by throttle sheet 322, the first spill port of other quantity Be set if 321 (if figure middle position is in first spill port on right side) by its bottom surface of bidirectional piston 32 one end by throttle sheet 322 maskings.

It is of the present utility model to be characterised by：Integral shockproof damper is provided with an at least check valve 34 in the mandrel 33, should The second spill port 341 that an at least check valve 34 is only capable of discharging in the same direction provided with least one limitation hydraulic oil, the mandrel 33 Axle center at provide one first drainback passage 331；It is another to there is one first valve rod 35 to be in be available for changing itself and the relative position of mandrel 33 Kenel be installed at the first drainback passage 331 of the mandrel 33；The mandrel 33 and its correspond to first valve rod 35 it is pre- First provided with least one the second spill port 341 for constituting first drainback passage 331 and an at least check valve 34 at setting stroke The first valve opening 332 communicated.

When implementing, a described at least check valve 34 is provided with least one for by oil that respectively second spill port 341 covers Door piece 342, in the present embodiment, an at least check valve 34 is provided with extremely in its opposite side corresponding with the bidirectional piston 32 A few throttle sheet 342, throttle sheet 342 set by it can be relative towards going deep into the internal direction of cylinder body 31 with mandrel 33 in check valve 34 During the process of displacement, by hydraulic oil effect and warpage, and the inside of cylinder body 31 is located at the bottom surface side of bidirectional piston 32 originally Hydraulic oil is able to that the top surface side of bidirectional piston 32 need not be located relatively at into cylinder body 31 by the metering function of bidirectional piston 32.

And, in check valve 34 with mandrel 33 towards during relatively toward the outside direction displacement of cylinder body 31, its check valve 34 Set throttle sheet 342 then covers the second spill port 341 corresponding to it, makes to be located at the top surface side of bidirectional piston 32 originally Hydraulic oil must be located relatively at the bottom surface one of bidirectional piston 32 into cylinder body 31 via the first spill port 321 of bidirectional piston 32 Side.

In principle, shock-absorbing damper of the present utility model, in use, the spring 20 that can arrange in pairs or groups be installed on the car body of vehicle with Between the support body of installing wheel, as cylinder body 31 and mandrel 33 respectively with the two ends of spring 20 corresponding to mechanical body (figure is omited) even Connect, in addition to impact strength when being lifted on wheel is absorbed using the metamorphosis of spring 20, Integral shockproof damper is in its mandrel 33 compress with spring 20 and drive bidirectional piston 32 relative towards during going deep into the internal direction displacement of cylinder body 31, and its position is two-way The throttle sheet 322 of the top surface of piston 32 simultaneously by hydraulic oil effect and warpage, and the inside of cylinder body 31 is located at bidirectional piston originally The hydraulic oil of 32 bottom surfaces side is able to be located relatively at bidirectional piston into cylinder body 31 via the first spill port 321 of bidirectional piston 32 32 top surface sides.

Conversely, Integral shockproof damper stretches with spring 20 in its mandrel 33 and drives bidirectional piston 32 towards relatively toward cylinder body During 31 outside direction displacements, its bottom surface of bidirectional piston 32 throttle sheet 322 simultaneously by hydraulic oil pressure act on And warpage, and the inside of cylinder body 31 is located at the hydraulic oil of the top surface side of bidirectional piston 32 originally via the of bidirectional piston 32 One spill port 321 is located relatively at the bottom surface side of bidirectional piston 32 into cylinder body 31.

According to this, it can limit hydraulic oil when spring 20 is by larger extension or compression stress using the first spill port 321 and lead to The mode for crossing bidirectional piston 32 gives appropriate suppression damping, uses buffering vibration, the rapid resonance for weakening spring 20 and reduction Spring avoids skidding because drastically deforming the danger for causing to destroy, and can improve the adherence properties of tire, to improve travel safety And riding comfort；Before dispatching from the factory, more using the top surface and the quantity configuration of throttle sheet 322 of bottom surface of the bidirectional piston 32, if Determine spring 20 to impact and damping flow velocity ratio during resilience.

Especially, shock-absorbing damper of the present utility model, using the design of the valve rod 35 of check valve 34 and first, is formed another It is individual to make hydraulic oil unidirectional by the passage of bidirectional piston 32, not only allow wheel to produce preferably adherence properties, help to lift vehicle Manipulation ability, and can be as shown in figure 3, in the state of factory setting not be changed, through in the simple adjustment in the outside of cylinder body 31 the The mode of the relative position of one valve rod 35, (control hydraulic oil passes through the degree that the first valve rod 35 of change covers the first valve opening 332 The flow of check valve), and then reach that quick adjustment shock-absorbing damper damps the purpose of flow velocity ratio when impact and resilience.

Because shock-absorbing damper of the present utility model will be available for mainly to adjust the component of damping flow velocity ratio (such as list To the valve rod 35 of valve 34 and first) be incorporated into inside cylinder body 31, therefore can not change face shaping, size condition limitation Under, allow whole shock-absorbing damping device is standby to be available for the function of quick adjustment damping flow velocity ratio, and be not to be limited to vehicle or car The installation limitation in body space, not only relatively tool operation ease, also relatively has practicality and an applicability.

In the embodiment shown in Fig. 2 and Fig. 3, described first valve rod 35 with the kenel of the bolt of mandrel 33 install At the first drainback passage 331 of the mandrel 33 so that with the outside side through the first valve rod of simple rotation 35 of cylinder body 31 The relative position of formula, accurately the first valve rod 35 of adjustment；And in described first valve rod 35 with the type with the bolt of mandrel 33 State is installed under the structure kenel at the first oil return channel 331 of the mandrel 33, one end of first valve rod 35 and correspondence stretching The mandrel 33, separately spiral shell is provided with one first hold-doun nut 371 at the section of the relative extension of the first valve rod 35 mandrel 33 so that To be adjusted really to expected position in the first valve rod 35, first valve rod 35 is fixed on using the first hold-doun nut 371 The position adjusted.

Furthermore, shock-absorbing damper of the present utility model, can be further as shown in figure 4, in described first valve when implementing A valve through hole 351 is provided at the axle center of bar 35, it is in be available for changing it with first valve rod 35 with respect to position separately to have one second valve rod 36 The kenel put is installed at the valve through hole 351, the bidirectional piston 32 provided with plural number respectively constitute respectively first spill port 321 with The by-pass prot 323 that the mandrel 33 is communicated, the mandrel 33 corresponds to presetting for second valve rod 36 at it and is provided with multiple at stroke Number constitutes the second valve opening 333 that first drainback passage 331 is communicated with the by-pass prot 323 of the bidirectional piston 32, second valve rod Lead on 36 and provided with least one for constituting the second valve opening 333 of the mandrel 33 with the second oil return that the first valve opening 332 is able to connect Road 361.

According to this, shock-absorbing damper of the present utility model, except the design using the valve rod 35 of check valve 34 and first, generation side Just user is outside effect of the quick adjustment damping flow velocity ratio in the outside of cylinder body 31；Even, can further as shown in figure 5, by Due to the mode of the relative position of the second valve rod 36 of the outside of cylinder body 31 adjustment, change what the second valve rod 36 covered the second valve opening 33 Degree, and then reach the strong and weak purpose of fine setting damping.

In the embodiment shown in Fig. 4 and Fig. 5, described second valve rod 36 is equally used and the bolt of the first valve rod 35 Kenel be installed at the valve through hole 351 of first valve rod 35 so as to pass through the valve of simple rotation second in the outside of cylinder body 31 The relative position of the mode of bar 36, accurately the second valve rod 36 of adjustment；Described second valve rod 36 with first valve rod 35 The kenel of bolt is installed under the structure kenel at the valve through hole 351 of first valve rod 35, one end of second valve rod 36 and Correspondence stretches out first valve rod 35, and separately spiral shell is provided with one second at the section of the relative extension of the second valve rod 36 first valve rod 35 Hold-doun nut 372.

Certainly, shock-absorbing damper of the present utility model, in the valve through hole 351 in first valve rod 35 shown in Fig. 4 and Fig. 5 Place is installed under the structure kenel of one second valve rod 36, and described first valve rod 35 is installed in the kenel with the bolt of mandrel 33 At first drainback passage 331 of the mandrel 33, one end of first valve rod 35 and the mandrel 33 is correspondingly stretched out, separately in first valve Structure kenel of the spiral shell provided with one first hold-doun nut 371 is presented at the section of the relative extension of bar 35 mandrel 33；And, this second Valve rod 36 is installed at the valve through hole 351 of first valve rod 35 with the kenel with the bolt of the first valve rod 35, second valve rod 36 one end and first valve rod 35 is correspondingly stretched out, separately the spiral shell at the section of the relative extension of the second valve rod 36 first valve rod 35 Structure kenel provided with one second hold-doun nut 372 is rendered as most preferably.

Structure is commonly used with tradition to compare, the shock-absorbing damper disclosed by the utility model, it is main to utilize check valve and first The design of valve rod, forms another and makes hydraulic oil unidirectional by the passage of bidirectional piston, allow wheel to produce preferably adherence properties, and Can be in the state of factory setting not be changed, through the mode of the relative position of the first valve rod of simple adjustment outside the cylinder body, soon Damping flow velocity ratio of the whole shock-absorbing damper of velocity modulation when impact and resilience；Even, it can be further transmitted through coordinating the second valve of adjustment The mode of the relative position of bar, reaches the strong and weak purpose of fine setting damping.

Claims (10)

1. a kind of shock-absorbing damper, can be with cylinder body (31) shift reciprocately in a middle installing one of the cylinder body (31) for being filled with hydraulic oil Bidirectional piston (32), in the mandrel (33) that the relative extension cylinder body (31) is connected on the bidirectional piston (32), the two-way work Set on plug (32) and offer plural first spill port (321)；It is characterized in that：

The shock-absorbing damper is provided with an at least check valve (34) in the mandrel (33), and an at least check valve (34) is provided with least One limitation hydraulic oil is only capable of providing one first at the second spill port (341) discharged in the same direction, the axle center of the mandrel (33) Drainback passage (331)；It is another to there is one first valve rod (35) to be installed in the kenel for being available for changing itself and mandrel (33) relative position The first drainback passage (331) place of the mandrel (33)；The mandrel (33) and its correspond to first valve rod (35) in advance setting Determine at stroke provided with least one the second spill port for constituting first drainback passage (331) and an at least check valve (34) (341) the first valve opening (332) communicated.

2. shock-absorbing damper as claimed in claim 1, it is characterised in that first valve rod (35) provides a valve at its axle center Through hole (351), separately has one second valve rod (36) to be installed in the kenel for being available for changing itself and the first valve rod (35) relative position Valve through hole (351) place, the bidirectional piston (32) respectively constitutes respectively first spill port (321) and the mandrel provided with plural number (33) by-pass prot (323) communicated, the mandrel (33) is provided with it corresponding to presetting for second valve rod (36) at stroke Plural number constitutes the second valve opening (333) that first drainback passage (331) is communicated with the by-pass prot (323) of the bidirectional piston (32), Obtained on second valve rod (36) and provided with least one for constituting the second valve opening (333) of the mandrel (33) with the first valve opening (332) With the second drainback passage (361) of connection.

3. shock-absorbing damper as claimed in claim 1, it is characterised in that first valve rod (35) with mandrel (33) the phase spiral shell The kenel connect is installed in the first drainback passage (331) place of the mandrel (33).

4. shock-absorbing damper as claimed in claim 1, it is characterised in that first valve rod (35) with mandrel (33) the phase spiral shell The kenel connect is installed in the first drainback passage (331) place of the mandrel (33), one end of first valve rod (35) and correspondence stretching The mandrel (33), separately spiral shell is provided with one first hold-doun nut at the section of the first valve rod (35) relative extension mandrel (33) (371)。

5. shock-absorbing damper as claimed in claim 1, it is characterised in that first valve rod (35) provides a valve at its axle center Through hole (351), separately has one second valve rod (36) to be installed in the kenel for being available for changing itself and the first valve rod (35) relative position Valve through hole (351) place, the bidirectional piston (32) respectively constitutes respectively first spill port (321) and the mandrel provided with plural number (33) by-pass prot (323) communicated, the mandrel (33) is provided with it corresponding to presetting for second valve rod (36) at stroke Plural number constitutes the second valve opening (333) that first drainback passage (331) is communicated with the by-pass prot (323) of the bidirectional piston (32), Obtained on second valve rod (36) and provided with least one for constituting the second valve opening (333) of the mandrel (33) with the first valve opening (332) With the second drainback passage (361) of connection；Second valve rod (36) is installed in the kenel with the first valve rod (35) bolt Valve through hole (351) place of first valve rod (35).

6. shock-absorbing damper as claimed in claim 1, it is characterised in that first valve rod (35) provides a valve at its axle center Through hole (351), it is in be installed in this for changing the kenel of itself and the first valve rod (35) relative position separately to have one second valve rod (36) Valve through hole (351) place, the bidirectional piston (32) respectively constitutes respectively first spill port (321) and the mandrel (33) provided with plural number The by-pass prot (323) communicated, the mandrel (33) corresponds to presetting for second valve rod (36) at it and plural number is provided with stroke The second valve opening (333) that first drainback passage (331) is communicated with the by-pass prot (323) of the bidirectional piston (32) is constituted, this Connected on two valve rods (36) and provided with least one for constituting the second valve opening (333) of the mandrel (33) with the first valve opening (332) Logical the second drainback passage (361)；Second valve rod (36) with the kenel with the first valve rod (35) bolt be installed in this Valve through hole (351) place of one valve rod (35), one end of second valve rod (36) and correspondingly stretches out first valve rod (35), separately in this Spiral shell is provided with one second hold-doun nut (372) at the section of second valve rod (36) relative extension, first valve rod (35).

7. shock-absorbing damper as claimed in claim 1, it is characterised in that first valve rod (35) provides a valve at its axle center Through hole (351), separately has one second valve rod (36) to be installed in the kenel for being available for changing itself and the first valve rod (35) relative position Valve through hole (351) place, the bidirectional piston (32) respectively constitutes respectively first spill port (321) and the mandrel provided with plural number (33) by-pass prot (323) communicated, the mandrel (33) is provided with it corresponding to presetting for second valve rod (36) at stroke Plural number constitutes the second valve opening (333) that first drainback passage (331) is communicated with the by-pass prot (323) of the bidirectional piston (32), Obtained on second valve rod (36) and provided with least one for constituting the second valve opening (333) of the mandrel (33) with the first valve opening (332) With the second drainback passage (361) of connection；First valve rod (35) is installed in the core with the kenel with mandrel (33) bolt The first drainback passage (331) place of axle (33), one end of first valve rod (35) and correspondingly stretches out the mandrel (33), separately in this Spiral shell is provided with one first hold-doun nut (371) at the section of one valve rod (35) relative extension mandrel (33)；Second valve rod (36) Valve through hole (351) place of first valve rod (35), second valve rod are installed in the kenel with the first valve rod (35) bolt (36) one end and first valve rod (35) is correspondingly stretched out, separately in the second valve rod (36) relative extension first valve rod (35) Spiral shell is provided with one second hold-doun nut (372) at section.

8. the shock-absorbing damper as described in claim 1 to 7 any of which, it is characterised in that the top surface of the bidirectional piston (32) And bottom surface is respectively mounted provided with an at least throttle sheet (322), among its total first spill port (321), preset The first spill port (321) of quantity is set to be covered by its position in one end of bidirectional piston (32) top surface by throttle sheet (322), The first spill port (321) of other quantity be then set by its position bidirectional piston (32) bottom surface one end by throttle sheet (322) cover.

9. the shock-absorbing damper as described in claim 1 to 7 any of which, it is characterised in that the check valve (34) is provided with least One for will respectively second spill port (341) masking throttle sheet (342).

10. the shock-absorbing damper as described in claim 1 to 7 any of which, it is characterised in that the top surface of the bidirectional piston (32) And bottom surface is respectively mounted provided with an at least throttle sheet (322), among its total first spill port (321), preset The first spill port (321) of quantity is set to be covered by its position in one end of bidirectional piston (32) top surface by throttle sheet (322), The first spill port (321) of other quantity be then set by its position bidirectional piston (32) bottom surface one end by throttle sheet (322) cover；The check valve (34) provided with least one for will respectively second spill port (341) masking throttle sheet (342).