CN107143598B - Oil-pressure damper - Google Patents

Abstract

The present invention proposes a kind of oil-pressure damper, including oil storage cylinder, working cylinder is arranged in the oil storage cylinder, hydraulic oil is filled in the oil storage cylinder and working cylinder, one end seal of the oil storage cylinder and working cylinder is equipped with guide cover, the opposite other end envelope of the working cylinder is equipped with bottom valve pedestal, and gas is further filled between the oil storage cylinder and working cylinder, the bottom valve unit of hydraulic oil in the negotiable oil storage cylinder and working cylinder is provided on the bottom valve pedestal.Oil-pressure damper of the invention keeps the structure of hydraulic oil snubber more compact, and save production cost and the set-up time of compensation air bag and mounting assembly, improves market competition advantage without increasing the volume of oil storage cylinder for installation compensation air bag.

Description

Oil-pressure damper

Technical field

The invention belongs to rail locomotive vehicle oil-pressure damper technical fields more particularly to a kind of non-gasbag-type oil pressure to subtract Shake device.

Background technique

Oil-pressure damper is the component part of railway locomotive bogie suspension, can effectively prevent vehicle that side occurs It puts, shake the head, the generation of the dangerous situations such as hunting, while can reduce the impact between wheel and rail, improving passenger and take Comfort.In the course of work, the piston unit of oil-pressure damper moves back and forth at work, and piston rod invades in hydraulic oil Volume also changes therewith, to cause the change of hydraulic fluid pressure.Become in order to compensate for volume in piston rod intrusion hydraulic oil Hydraulic fluid pressure caused by changing changes, and compensation air bag is typically provided in the oil storage cylinder of oil-pressure damper, compensates and fills in air bag There is air flat to hydraulic fluid pressure when perhaps inert gas is by compensating contraction or the expansion of air bag come the movement of compensating piston bar The change of weighing apparatus.

203348408 U of Chinese patent CN discloses a kind of oil-pressure damper with compensation air bag, including is located at middle part Pressure cylinder and peripheral ring around oil storage cylinder, pressure cylinder is connected to oil storage cylinder by being set to the bottom valve of bottom, pressure cylinder and storage The port envelope of oil cylinder sets guide cover, and piston rod is worn in pressure cylinder, and piston rod is fixedly connected with piston, have on piston orifice valve and Spring is symmetrical arranged compensation air bag at the periphery wall of pressure cylinder.The utility model has the oil-pressure damper of compensation air bag, in order to Smoothly installation compensation air bag, inevitably needs to increase the size of oil storage cylinder, larger so as to cause oil-pressure damper volume, knot Structure is not compact, and higher cost；Meanwhile air bag intrusion is compensated in oil liquid, as the extension of time inevitably results from Gas leaks in oil liquid, not only will affect the compensation effect to oil liquid volume, but also gas is mixed into oil liquid and will affect oil pressure The linear effectiveness in vibration suppression of damper.

Therefore, a kind of compact-sized oil-pressure damper is designed, volume and manufacturing cost is effectively reduced, while avoiding gas Body leakage problem, is very important to those skilled in the art.

Summary of the invention

The present invention technical problem not compact for above-mentioned oil-pressure damper structure, proposes a kind of compact-sized oil pressure Volume and manufacturing cost is effectively reduced in damper, and avoids gas leakage problem.

In order to achieve the above object, the technical solution adopted by the present invention are as follows:

A kind of oil-pressure damper, including oil storage cylinder are arranged with working cylinder, the oil storage cylinder and working cylinder in the oil storage cylinder In be filled with hydraulic oil, an end seal of the oil storage cylinder and working cylinder is equipped with guide cover, and the opposite other end of the working cylinder is sealed Equipped with bottom valve pedestal, it is further filled with gas in the oil storage cylinder, the negotiable oil storage is provided on the bottom valve pedestal The bottom valve unit of hydraulic oil in cylinder and working cylinder.

Preferably, being provided with the piston unit that can be moved back and forth in the working cylinder, the work in the working cylinder Filling in unit includes piston only, and the valve body group of negotiable piston only two sides hydraulic oil is provided on the piston only Part, be provided on the valve component between the negotiable piston only and bottom valve unit gas to the piston only with lead To the fixed orifice between lid.

Preferably, the oil-pressure damper further comprises that gas is extremely between the negotiable piston only and guide cover Exhaust unit between the oil storage cylinder and working cylinder, the exhaust unit include the conduction hole being set on the guide cover, The conduction hole is connected with the working cylinder, and air discharge duct has further been arranged radially on the guide cover, the air discharge duct One end is connected with the conduction hole, and the other end of the air discharge duct is connected with the oil storage cylinder.

Preferably, the conduction hole is circumferentially distributed on the guide cover along the guide cover, the exhaust unit into One step includes the annular groove being connected with the conduction hole, and one end of the air discharge duct is connected with the annular groove.

Preferably, the bottom valve unit includes that the hydraulic oil between the oil storage cylinder and working cylinder can be flowed into the work To make the oil return valve in cylinder, oil return hole is provided on the bottom valve pedestal, the oil return valve is set in the oil return hole, and described time Oilhole center line is located at the side of the bottom valve base central line.

Preferably, the bottom valve unit further comprise hydraulic oil in the working cylinder can be flowed into the oil storage cylinder and Unloading valve between working cylinder is provided with unloading hole on the bottom valve pedestal, and the unloading valve is set in the unloading hole.

Preferably, the bottom valve pedestal is further provided with the hydraulic oil that the unloading valve outflow may be guided described in Oil return hole side flows into the guidance set between the oil storage cylinder and working cylinder, and the guidance set includes being set to the bottom valve First guide plate of base bottom surface, first guide plate are synthetic into arc, and the opening of the arc is set towards the oil return valve It sets, first guide plate is located at the unloading valve away from the oil return valve side.

Preferably, the guidance set further comprises the second guide plate, second guide plate is led with described first It is connected to the bottom of plate and is bonded with the oil storage cylinder bottom surface, is arranged on second guide plate with the oil return valve corresponding position There is U-shaped opening.

Preferably, be connected with third guide plate at the U-shaped opening, the third guide plate further with the bottom valve Pedestal, the first guide plate are connected to form hydraulic oil channel, and the third guide plate and the unloading valve corresponding position are arranged Having may be guided the unloading valve hydraulic oil and flows to outlet to the oil return valve.

Compared with prior art, the advantages and positive effects of the present invention are:

1, oil-pressure damper of the invention, filled in the oil storage cylinder gas and the negotiable oil storage cylinder and The bottom valve unit of hydraulic oil in working cylinder, when the piston rod, which invades the volume in the working cylinder hydraulic oil, to change, By the gas expansion or compression so that the hydraulic oil circulates in the oil storage cylinder and working cylinder, to compensate the work The variation of the working cylinder hydraulic oil volume caused by stopper rod moves, without increasing the body of oil storage cylinder for installation compensation air bag Product, keeps the structure of hydraulic oil snubber more compact, and saves production cost and the installation of compensation air bag and mounting assembly Time improves market competition advantage；Gas leakage problem in compensation air bag is avoided simultaneously.

2, oil-pressure damper of the invention, the oil storage cylinder and work can be drained into for gas mixed in working cylinder by being provided with Make the exhaust unit between cylinder, avoids when the gas in the oil storage cylinder caused by being entered in working cylinder by oil return valve " air pocket " phenomenon, improves the stability of oil-pressure damper of the present invention.

3, oil-pressure damper of the invention, oil return centerline hole is located at the side of the bottom valve base central line, and returns Oilhole center line is located at the distance between described bottom valve base central line and meets the oil return when oil-pressure damper laterally works Valve invades in hydraulic oil completely, and the gas avoided in oil storage cylinder is entered in working cylinder by oil return valve, improves oil of the invention Stability when pressure damper laterally works.

4, oil-pressure damper of the invention, the hydraulic oil that bootable unloading valve outflow is provided on bottom valve pedestal flow to institute State the guidance set of oil return valve side, it is ensured that when oil-pressure damper is laterally disposed, the hydraulic oil of unloading valve outflow and oil storage The hydraulic oil in cylinder bottom portion mixes, and avoids and a possibility that gas mixing, further improves for oil-pressure damper of the present invention Laterally stability when work.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of oil-pressure damper hydraulic oil of the present invention flow direction；

Fig. 2 is enlarged drawing at A in Fig. 1；

Fig. 3 is the structural schematic diagram of gas flow when oil-pressure damper of the present invention is vented；

Fig. 4 is oil-pressure damper exhaust unit structure schematic diagram of the present invention；

Fig. 5 is one of oil-pressure damper bottom valve base construction schematic diagram of the present invention；

Fig. 6 is the two of oil-pressure damper bottom valve base construction schematic diagram of the present invention；

Fig. 7 is the three of oil-pressure damper bottom valve base construction schematic diagram of the present invention.

In above each figure: 1, oil storage cylinder；2, working cylinder；3, guide cover；4, piston unit；41, piston only；42, piston Bar；43, valve component；5, bottom valve pedestal；51, oil return hole；52, unloading hole；53, guidance set；531, the first guide plate；532, Second guide plate；533, third guide plate；534, outlet；6, bottom valve unit；61, oil return valve；611, oil return valve body；612, it returns Oil valve bar；613, oil return vavle shelf；614, oil return valve nut；615, oil return valve spring；62, unloading valve；621, off-load valve pocket；622, Off-load spool；623, unloading port；624, unloading valve shoulder；625, off-load valve spring；7, exhaust unit；71, conduction hole；72, ring Slot；73, air discharge duct；8, hydraulic oil；9, gas.

Specific embodiment

In the following, the present invention is specifically described by illustrative embodiment.It should be appreciated, however, that not into one In the case where step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiments In.

In the description of the present invention, it should be noted that when oil-pressure damper is vertically placed, the side towards guide cover is Top, the side towards bottom valve unit are lower section；The orientation of the instructions such as term "inner", "outside", "upper", "lower", "front", "rear" or Positional relationship is positional relationship based on the figure, is merely for convenience of description of the present invention and simplification of the description, rather than is indicated Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand For limitation of the present invention.In addition, term " first ", " second ", " third " are used for description purposes only, and should not be understood as indicating Or imply relative importance.

As shown in Figure 1 and Figure 2, a kind of oil-pressure damper, including oil storage cylinder 1, working cylinder 2, guide cover 3,4 and of piston unit Bottom valve pedestal 5, the oil storage cylinder 1 and working cylinder 2 are cylindrical shape, and 2 coaxial sleeve of the working cylinder is set to the oil storage cylinder 1 In, hydraulic oil 8 is filled in the oil storage cylinder 1 and working cylinder 2,3 envelope of guide cover is set to the oil storage cylinder 1 and working cylinder 2 one end simultaneously seals the end of the oil storage cylinder 1 and working cylinder 2；5 envelope of bottom valve pedestal is set to the phase of the working cylinder 2 It is sealed to the other end and by the end of the working cylinder 2, so that the hydraulic oil 8 in the working cylinder 2 and oil storage cylinder 1 is isolated；Institute It states piston unit 4 to be set in the working cylinder 1 and can move back and forth in the working cylinder 1, the piston unit 4 includes living The internal surface gaps of plug body 41, the lateral surface of the piston only 41 and the working cylinder 2 cooperate, and clearance fit meets at this The requirement of closing oil path is provided with piston rod 42 along the working cylinder 2 is axial on the piston only 41, and the piston rod 42 is worn And can be in the guide cover 3 axially movable in the guide cover 3, the piston rod 42 and 3 gap of guide cover It seals with merga pass oil liquid with closing oil path；It is hydraulic that the negotiable piston only two sides are provided on the piston only 41 The valve component 43 of oil 8, when the piston rod 42 drives the piston only 41 to move towards the guide cover 3, the work 8 pressure increase of hydraulic oil between plug body 41 and guide cover 3, the hydraulic oil pressure between the piston only 41 and guide cover 3 Power can open oil circuit of the valve component 43 by guide cover to bottom valve unit, to make the hydraulic oil 8 from the piston sheet It is flowed between body 41 and guide cover 3 before the piston only 41 and bottom valve unit 6, and then realizes unloading function, when the work When stopper rod 42 drives the piston only 41 to move towards the bottom valve unit 6, between the piston only 41 and bottom valve unit 6 8 pressure increase of hydraulic oil, the pressure of hydraulic oil 8 can open the valve component between the piston only 41 and bottom valve unit 6 By bottom valve unit 6 to the oil circuit of guide cover 3, to make the hydraulic oil 8 between the piston only 41 and bottom valve unit It flows between the piston only 41 and guide cover 3, and then realizes unloading function.

It should be noted that the piston rod 42 invades in the hydraulic oil 8 during the piston rod 42 movement Volume also therewith reduce or increase, so as to cause 8 stereomutation of hydraulic oil in the working cylinder 2, in order to compensate for because of institute It states piston rod 42 and invades 8 stereomutation of hydraulic oil in the working cylinder 2 caused by volume change in the hydraulic oil 8, it is described It is further filled with gas 9 in oil storage cylinder 1, the negotiable working cylinder 2 and oil storage are further provided on the bottom valve pedestal 5 The bottom valve assembly 6 of hydraulic oil 8 in cylinder 1, when the piston rod 42 is moved towards guide cover 3, the piston rod 42 invades described Volume in 2 hydraulic oil 8 of working cylinder is reduced, to make 8 pressure reduction of hydraulic oil in the working cylinder 2, the oil storage cylinder 1 and work The oil circuit by oil storage cylinder 1 to working cylinder 2 in bottom valve unit 6 can be opened by making 8 pressure of hydraulic oil between cylinder 2, the oil storage Gas between cylinder 1 and working cylinder 2 can oppress the hydraulic oil 8 between the oil storage cylinder 1 and working cylinder 2 and pass through the bottom valve unit 6 enter in the working cylinder 2；When the piston rod 42 is moved towards bottom valve unit 6, the piston rod 42 invades the work Volume in 2 hydraulic oil 8 of cylinder increases, thus increase hydraulic fluid pressure in the working cylinder 2, hydraulic oil 8 in the working cylinder 2 Pressure can will be opened in the bottom valve unit 6 by the oil circuit of working cylinder 2 to oil storage cylinder 1, and the hydraulic oil 8 in the working cylinder 2 is logical The bottom valve unit 6 is crossed to flow between the oil storage cylinder 1 and working cylinder 2 and compress the gas between the oil storage cylinder 1 and working cylinder 2 Body.

Oil-pressure damper of the invention fills gas 9 and negotiable institute between the oil storage cylinder 1 and working cylinder 2 The bottom valve unit 6 for stating hydraulic oil in oil storage cylinder 1 and working cylinder 2, when the piston rod 42 invades in 2 hydraulic oil 8 of working cylinder Volume when changing, expanded or compressed by the gas 9 so that the hydraulic oil 8 is in the oil storage cylinder 1 and work It circulates in cylinder 2, to compensate the variation of 2 hydraulic oil of working cylinder, 8 pressure caused by the piston rod 42 moves, without being installation Compensation air bag and increase the volume of oil storage cylinder 1, keep the structure of hydraulic oil snubber more compact, and save compensation air bag and The production cost of mounting assembly and set-up time, improve market competition advantage.

With further reference to Fig. 2, the bottom valve unit 6 includes oil return valve 61 and unloading valve 62, and the oil return valve 61 can make institute It states the hydraulic oil 8 between oil storage cylinder 1 and working cylinder 2 to flow into the working cylinder 2, the unloading valve 62 can make the working cylinder 2 In hydraulic oil 8 flow between oil storage cylinder 1 and working cylinder 2.Specifically, being provided with oil return hole 51, institute on the bottom valve pedestal 5 It states oil return valve 61 to be set in the oil return hole 51, the oil return valve 61 includes oil return valve body 611, oil return valve rod 612, oil return valve Bracket 613, oil return valve nut 614 and oil return valve spring 615, the oil return valve body 611 are round and are located at the bottom valve pedestal 5 Top, the oil return valve rod 612 be it is cylindrical and it is axial be arranged in the oil return hole 51,611 appearance of oil return valve rod There are gaps between 51 inner surface of face and oil return hole to form hydraulic oil access, the oil return valve rod 612 and 611 bottom of oil return valve body Face integrally connected, and the oil return valve rod 612 and oil return valve body 611 are perpendicular；The oil return valve support 613 is horizontally set at institute It states in oil return hole 51, the internal surface gaps of the transverse ends of the oil return valve support 613 and the oil return hole 51 cooperate, and described time Oil valve bracket 613 is connect with the part inner peripheral surface of the oil return hole 61, so that the hydraulic oil 8 can pass through the oil return Channel between valve support 613 and oil return hole 51, the oil return valve support 613 is axial to be provided with connecting hole, the oil return valve rod 612 are arranged in the connecting hole, and 612 outer surface of oil return valve rod and connecting hole internal surface gaps cooperate；The oil return valve Nut 614 is set to 612 bottom of oil return valve rod, and the outer surface of the oil return valve rod 612 is further equipped with oil return Valve spring 615, the both ends of the oil return valve spring 615 are solid with the oil return valve nut 614 and the oil return valve support 613 respectively Even, the oil return valve spring 615 is in compressive state, to make the top of 611 bottom surface of oil return valve body and the bottom valve pedestal 5 Face pressure is tight and closes the oil circuit between the oil return valve body 611 and the bottom valve pedestal 5；When the piston rod 42 is towards described When guide cover 3 moves, the piston rod 42 invades the volume in 2 hydraulic oil 8 of working cylinder and reduces, 2 hydraulic oil 8 of the working cylinder pressure Power reduces, and the gas 9 in the oil storage cylinder 1, which expands, makes the hydraulic oil between the oil storage cylinder 1 and working cylinder 2 oppress the oil return Valve body 611 is moved towards guide cover 3, and the oil circuit between the oil return valve body 611 and the bottom valve pedestal 5 is opened, the oil storage Hydraulic oil 8 between cylinder 1 and working cylinder 2 passes sequentially through between oil return hole 51, the oil return valve body 611 and the bottom valve pedestal 5 It flows between the piston only 41 and bottom valve unit 6, until the hydraulic oil pressure dynamic balance in the oil storage cylinder 1 and working cylinder 2, To compensation because between oil storage cylinder 1 and working cylinder hydraulic oil 8 reduce due to increased space.

Further, unloading hole 52 is provided on the bottom valve pedestal 5, the unloading valve 62 is installed on the unloading hole 52 In, the unloading valve 62 includes off-load valve pocket 621 and off-load spool 622,621 outer surface of off-load valve pocket and the unloading hole 52 connected and closing oil paths, the off-load valve pocket 621 is axial to be provided with through-hole, and the off-load spool 622 is arranged in the through-hole In, with closing oil path, the off-load spool 622 is set for 622 outer surface of off-load spool and the through-hole inner surface clearance fit It is equipped with blind hole, the bottom end of the blind hole is located below, and unloading port 623 has been arranged radially on the side wall of the blind hole；The off-load The bottom of spool 622 is provided with the shoulder 624 that can be matched with the off-load valve pocket 621, and the top surface of the shoulder is unloaded with described The bottom surface clearance fit of lotus valve pocket 622 is with closing oil path；The bottom surface of the off-load spool 622 is connected with the bottom valve pedestal 5 Unloading spring 625 is to make the off-load spool 622 that can move up and down；When the piston rod 42 is transported towards the bottom valve unit 6 When dynamic, the piston rod 42 invades the increase of the volume in 2 hydraulic oil 8 of working cylinder, and hydraulic fluid pressure increases in the working cylinder 2 Add, hydraulic oil is oppressed the off-load spool 622 and transported towards the bottom valve unit 6 between the piston only 41 and bottom valve unit 6 Dynamic, the unloading port 623 is separated with 621 inner surface of off-load valve pocket, and the shoulder 624 and 621 bottom of off-load valve pocket Part is from hydraulic oil passes sequentially through the blind hole, unloading port 623, the shoulder between the piston only 41 and bottom valve unit 6 Oil circuit flows between the oil storage cylinder 1 and working cylinder 2 between 624 and 621 bottom of off-load valve pocket, liquid in the oil storage cylinder 1 Oil pressure increases and compresses the gas 9, until the hydraulic oil pressure dynamic balance in the oil storage cylinder 1 and working cylinder 2, thus It compensates because hydraulic oil 8 increases due to the space of reduction in oil storage cylinder 1.

Preferably, the unloading valve 62 may be configured as one or more, to meet different 8 pressure of hydraulic oil and stream Amount compensation requires, and when the unloading valve 62 is set as multiple, the multiple unloading valve 62 is uniformly distributed and the oil return valve 61 Outside.

Referring to Fig. 5, when the oil-pressure damper is vertically arranged, the gas 9 in the oil storage cylinder 1 is located at because density is small The top of the hydraulic oil 8, the piston rod 42 have not had gas 9 and have passed through oil return valve 61 when moving towards the guide cover 3 Into in working cylinder 2；The same position of gas when the oil-pressure damper is laterally arranged, between the oil storage cylinder 1 and working cylinder 2 In the top of the hydraulic oil 8, in order to avoid the gas 9 is entered in the working cylinder 2 by oil return valve 61, the oil return hole 51 center lines are lower than the center line of the bottom valve pedestal 5, and 51 center line of oil return hole is lower than 5 center line of bottom valve pedestal Distance is h, and the capacity of h and hydraulic oil 8 meets the intrusion completely of oil return valve 61 when the oil-pressure damper is laterally disposed In hydraulic oil 8.

Further, referring to Fig. 6, Fig. 7, when the oil-pressure damper is laterally arranged, in order to guarantee in the working cylinder 2 Hydraulic oil 8 by after the unloading valve 62 towards the side of the oil return valve 61 flow into the oil storage cylinder 1 and working cylinder 2 it Between, the bottom of the bottom valve pedestal 5 is further provided with guidance set 53, and the guidance set 53 includes the first guide plate 531, The bottom surface of first guide plate 531 and the bottom valve pedestal 5 is connected, and first guide plate 531 and the bottom valve pedestal 5 Bottom surface it is perpendicular, 531 outer surface of the first guide plate be it is arc-shaped, the unloading valve 62 is located at first guide plate Inside 531 circular arc, in order to avoid hydraulic oil 8 is flowed by the unloading valve 62 between the piston only 41 and bottom valve unit 6 When entering between the oil storage cylinder 1 and working cylinder 2, the gas 9 between the oil storage cylinder 1 and working cylinder 2 is mixed, and described first leads It is greater than semicircle to the arc angle of plate 531, so that hydraulic oil 8 is unloaded by described between the piston only 41 and bottom valve unit 6 After lotus valve 62, mixed in the guidance of first guide plate 531 to the hydraulic oil 8 with 1 bottom of oil storage cylinder.

With continued reference to Fig. 6, Fig. 7, the unloading valve 62 flows through in order to further increase hydraulic oil 8 is towards the oil storage cylinder The uniformity of 1 flows, the guidance set 53 further comprise the second guide plate 532 and third guide plate 533, described Two guide plates 532 are vertically installed in the bottom of first guide plate 531, and second guide plate 532 is to lead with described first Matched to plate 531 arc-shaped, the bottom surface of second guide plate 532 and the bottom of the oil storage cylinder 1 fit, and described Second guide plate 532 is provided with U-shaped breach at position corresponding with the oil return valve 61, and the U-shaped breach makes the hydraulic oil 8 Pass through the oil return valve 61 and unloading valve 62；The upper end of the third guide plate 533 is vertically installed in the bottom valve pedestal 5 Bottom, the lower end of the third guide plate 533 is connected with the U-shaped breach of second guide plate 532, the third guide plate 533 both ends are connected with the both ends of first guide plate 531, on the third guide plate 533 with 62 phase of unloading valve The hydraulic oil 8 that being provided at corresponding position can be such that the unloading valve 62 flows through smoothly flows into the outlet of the oil storage cylinder 1, institute It states after hydraulic oil 8 between piston only 41 and bottom valve unit 6 passes through the unloading valve 62 and is flowed out from the outlet 534, and The third guide plate 533 leads the bottom for flowing downwardly into the oil storage cylinder 1, avoids and mixes and occur with the gas 9 on top " air pocket " phenomenon.

Referring to Fig. 3, Fig. 4, when the gas 9 between the oil storage cylinder 1 and working cylinder 2 passes through described in the oil return valve 61 entrance After working cylinder 1, in order to which the gas 9 to be discharged from the working cylinder 1, oil-pressure damper of the invention further comprises exhaust Unit 7, the exhaust unit 7 include conduction hole 71, annular groove 72 and air discharge duct 73, and the conduction hole 71 is axially set in described lead One side to the bottom surface of lid 3, i.e., towards the working cylinder 1；The annular groove 72 is set on the bottom surface of the guide cover 3, and with The conduction hole 71 is connected, and in order to which the gas in 1 hydraulic oil 8 of working cylinder is discharged uniformly, the conduction hole 71 can be set It is set to multiple, the multiple conduction hole is uniformly distributed circumferentially on the bottom surface of the guide cover 3, and the multiple conduction hole 71 is It is connected to the annular groove 73；The air discharge duct 73 is arranged radially in the bottom surface of the guide cover 3, one end of the air discharge duct 73 It is connected with the annular groove 72, the opposite other end of the air discharge duct 73 is connected with gas 9 between oil storage cylinder 1 and working cylinder 2； The gas 9 in the working cylinder 2 to be drained between oil storage cylinder 1 and working cylinder 2.

It should be noted that fixed orifice 431 is provided on the valve component 43, when the piston only 41 generates Subtle movement, i.e., it is described hydraulic when described 8 insufficient pressure of hydraulic oil is to overcome the oil circuit for opening the valve component 43 Oil 8 can circulate to realize unloading function, the piston only 41 in 41 two sides of piston only by fixed orifice 431 Mixed gas 9 can also flow into the piston only by the fixed orifice 431 in hydraulic oil 8 between bottom valve unit 6 Between 41 and guide cover 3.

Specifically, when exhaust, oil-pressure damper is vertically placed, and oppressing piston rod 42 downwards makes 41 direction of piston only The bottom valve unit 6 moves, and makes 9 pressure increase of gas between the piston only 41 and bottom valve unit 6, the piston only 41 Gas 9 is entered between the piston only 41 and guide cover 3 by the fixed orifice 431 between bottom valve unit 6；Upwards Pull the piston rod 42 to move the piston only 41 towards the guide cover 3, the piston only 41 and guide cover 3 it Between 9 pressure increase of gas and enter in the multiple conduction hole 71, gas collection in the multiple conduction hole 71 to annular groove 72 In and flow between the oil storage cylinder 1 and working cylinder 2 eventually by air discharge duct 73, complete exhaust work.

Claims (6)

1. a kind of oil-pressure damper, including oil storage cylinder (1), working cylinder (2), the oil storage cylinder are arranged in the oil storage cylinder (1) (1) and in working cylinder (2) it is filled with hydraulic oil (8), an end seal of the oil storage cylinder (1) and working cylinder (2) is equipped with guide cover (3), the opposite other end envelope of the working cylinder (2) is equipped with bottom valve pedestal (5), it is characterised in that: the oil storage cylinder (1) and work It is further filled between cylinder (2) gas (9), the negotiable oil storage cylinder (1) and work is provided on the bottom valve pedestal (5) The bottom valve unit (6) of hydraulic oil (8) in cylinder (2)；

The bottom valve unit (6) includes that the hydraulic oil (8) between the oil storage cylinder (1) and working cylinder (2) can be flowed into the work Make the oil return valve (61) in cylinder (2), be provided with oil return hole (51) on the bottom valve pedestal (5), the oil return valve (61) is set to In the oil return hole (51), oil return hole (51) center line is located at the side of bottom valve pedestal (5) center line；

The bottom valve unit (6) further comprise hydraulic oil (8) in the working cylinder (2) can be flowed into the oil storage cylinder (1) and Unloading valve (62) between working cylinder (2) is provided with unloading hole (52) on the bottom valve pedestal (5), and the unloading valve (62) sets It is placed in the unloading hole (52)；

The bottom valve pedestal (5) is further provided with the hydraulic oil (8) that the unloading valve (62) outflow may be guided towards described time Oilhole (51) side flows into the guidance set (53) between the oil storage cylinder (1) and working cylinder (2), guidance set (53) packet The first guide plate (531) for being set to bottom valve pedestal (5) bottom surface is included, first guide plate (531) is synthetic into arc, The opening of the arc is arranged towards the oil return valve (61), and first guide plate (531) is located at the unloading valve (62) and deviates from Oil return valve (61) side.

2. oil-pressure damper according to claim 1, it is characterised in that: being provided in the working cylinder (2) can be described The piston unit (4) moved back and forth in working cylinder (2), the piston unit (4) includes piston only (41), the piston only (41) valve component (43) of the negotiable piston only (41) two sides hydraulic oil (8), the valve component are provided on (43) gas (9) is provided between the negotiable piston only (41) and bottom valve unit (6) on to the piston only (41) Fixed orifice (431) between guide cover (3).

3. oil-pressure damper according to claim 2, it is characterised in that: the oil-pressure damper further comprises negotiable Exhaust list of the gas (9) extremely between the oil storage cylinder (1) and working cylinder (2) between the piston only (41) and guide cover (3) First (7), the exhaust unit (7) include the conduction hole (71) being set on the guide cover (3), the conduction hole (71) and institute It states working cylinder (2) to be connected, be further arranged radially air discharge duct (73) on the guide cover (3), the air discharge duct (73) One end is connected with the conduction hole (71), and the other end of the air discharge duct (73) is connected with the oil storage cylinder (1).

4. oil-pressure damper according to claim 3, it is characterised in that: the conduction hole (71) is along the guide cover (3) It is circumferentially distributed on the guide cover (3), the exhaust unit (7) further comprises the ring being connected with the conduction hole (71) One end of slot (72), the air discharge duct (73) is connected with the annular groove (72).

5. oil-pressure damper according to claim 1, it is characterised in that: the guidance set (53) further comprises second Guide plate (532), second guide plate be connected with the bottom of first guide plate (531) and with the oil storage cylinder (1) bottom Face paste is closed, and the oil return valve (61) corresponding position is provided with U-shaped opening on second guide plate (532).

6. oil-pressure damper according to claim 5, it is characterised in that: be connected with third guide plate at the U-shaped opening (533), the third guide plate (533) is further connected to form liquid with the bottom valve pedestal (5), the first guide plate (531) Pressure oil (8) channel, the third guide plate (533) and the unloading valve (62) corresponding position are provided with described in bootable flow through The hydraulic oil (8) of unloading valve (62) flows to the outlet (534) of the oil return valve (61).