CN206360947U - A kind of helicopter tractor wheel compresses hydraulic system - Google Patents
A kind of helicopter tractor wheel compresses hydraulic system Download PDFInfo
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- CN206360947U CN206360947U CN201621444912.9U CN201621444912U CN206360947U CN 206360947 U CN206360947 U CN 206360947U CN 201621444912 U CN201621444912 U CN 201621444912U CN 206360947 U CN206360947 U CN 206360947U
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Abstract
A kind of helicopter tractor wheel compresses hydraulic system, solves and occurs wheel slippage when traction helicopter is turned or loosen；Including two hydraulic cylinders, accumulator, three-position four-way valve, hydraulic pump and liquid reserve tank；Wherein hydraulic cylinder is divided into two cavitys by piston, cavity of two hydraulic cylinders provided with piston rod is interconnected by pipeline, the cavity for being not provided with piston rod is interconnected by pipeline, lead to and accumulator is connected on the pipeline for be not provided with plunger, the port of this two pipelines is connected to two interfaces of the three-position four-way valve with end；Two interfaces of the three-position four-way valve other end are connected with leading to the pipeline of liquid reserve tank, wherein a pipeline is provided with hydraulic pump；It the advantage is that reliability is high, operate pinch roller frame that is easy to maintenance, making tractor freely to be stretched with the swing of helicopter front-wheel, while constant pressure can be provided to wheel.
Description
Technical field
The utility model is related to a kind of helicopter tractor, and more particularly to a kind of helicopter tractor wheel compresses hydraulic system.
Background technology
At present, when helicopter tractor is drawn to helicopter, helicopter is it some times happens that turning, helicopter front-wheel
A deflection angle will be produced, it is necessary to helicopter tractor clamping lifting device is provided with the safeguard measure for adapting to front wheel nutation angle,
Slipped or loosening so as to avoid the occurrence of wheel.The country is existing more using stub nutation type, and this kind of measure can allow to clamp lifting device
Deflected in low-angle, but it is larger to the abrasion of elevating ram, easily cause elevating ram leakage of oil.
The content of the invention
In order to solve problem above, the utility model provides a kind of reliability height, operation is easy to maintenance, wheel can be carried
Hydraulic system is compressed for the helicopter tractor wheel of constant pressure.
Helicopter tractor wheel described in the utility model compresses hydraulic system, including two hydraulic cylinders, accumulator, three
Four-way valve, hydraulic pump and liquid reserve tank；Wherein hydraulic cylinder is divided into two cavitys by piston, and two hydraulic cylinders are provided with the cavity of piston rod
It is interconnected by pipeline, the cavity for being not provided with piston rod is interconnected by pipeline, leads to the pipe for being not provided with plunger
Accumulator is connected on road, the port of this two pipelines is connected to two interfaces of the three-position four-way valve with end；Three-position four-way valve
Two interfaces of the other end are connected with leading to the pipeline of liquid reserve tank, wherein a pipeline is provided with hydraulic pump.
During work, the three-position four-way valve has three positions, and three-position four-way valve first is in first position, and hydraulic pump is from storage
Extract liquid medium in liquid case out, the cavity of non-piston rod is not provided with by three-position four-way valve input hydraulic cylinder, with liquid medium
Input hydraulic cylinder, constantly promotes hydraulic cylinder piston and piston rod to stretch out, so as to hold wheel tightly；When the pressure to wheel reach it is specified
During pressure, three-position four-way valve is switched into pipeline between middle position, i.e. liquid reserve tank and hydraulic cylinder and cut off, hydraulic cylinder, accumulator and
A closed-loop path is formed between three-position four-way valve, hydraulic system pressure is balanced, and helicopter is straight-line travelling；When helicopter is turned
When, hydraulic cylinder is exceeded the rated pressure that accumulator is provided by the reaction force of wheel, and hydraulic cylinder shrinks, and unnecessary liquid is situated between
Matter is compressed in accumulator, and media interior pressure rises, reaction of the rated pressure equal to wheel provided until accumulator
Power, now hydraulic cylinder stopping is shunk；When helicopter returns to straight-line travelling from turning, hydraulic cylinder is subtracted by the reaction force of wheel
Small, now pressure medium starts to reduce in system, and accumulator discharges liquid medium to hydraulic cylinder, and hydraulic cylinder stretches out, until accumulation of energy
The reaction force that the rated pressure that device is provided is equal to；When drawing after hours, three-position four-way valve is in the 3rd position, hydraulic pump
The cavity that liquid medium is provided with piston rod by three-position four-way valve input hydraulic cylinder, hydraulic cylinder piston rod contracting are pumped out out of liquid reserve tank
Return, unclamp wheel.
Helicopter tractor wheel described in the utility model compresses hydraulic system, can with the swing of helicopter front-wheel freedom
Flexible, in whole process, wheel can be by lasting, constant pressure, and the lateral attitude that inclined front-wheel can keep fixed is moved,
Therefore be not in that wheel slips or loosened phenomenon.
Further, a pipeline for leading to liquid reserve tank, the pipeline are connected between the three-position four-way valve and liquid reserve tank
It is provided with overflow valve.When the thrust that constantly entrance hydraulic cylinder is formed to wheel of the medium in liquid reserve tank is excessive, overflow valve is beaten
Open, medium flows back to hydraulic oil container, protection wheel prevents from being subject to crushing.The pressure size of regulation relief valve, can adjust clamping frame to machine
The thrust of wheel.
Further, the hydraulic cylinder is oil cylinder, and the liquid reserve tank is fuel tank.
Further, the hydraulic pump of stating is gear pump.
Brief description of the drawings
Fig. 1 is the structure chart that helicopter tractor wheel described in the utility model compresses hydraulic system.
Each piece number explanation in figure：
1- gear pumps；2- overflow valves；3- three-position four-way valves；4- accumulators；5- compressed oil cylinders；6- hydraulic oil containers；7- pipelines
A；8- pipelines B；9- pipelines C；10- pipelines D；11- chambers A；12- chambers B.
Embodiment
Hydraulic system is compressed with reference to Fig. 1 to helicopter tractor wheel described in the utility model further to retouch in detail
State.
As shown in figure 1, helicopter tractor wheel described in the utility model compresses hydraulic system, including two compressed oil cylinders
5th, accumulator 4, three-position four-way valve 3, gear pump 1 and hydraulic oil container 6 and overflow valve 2.
The compressed oil cylinder 5 is divided into two cavitys by piston --- piston rod, chamber are provided with chamber A11 and chamber B12, chamber A11
Piston rod is not provided with B12, as shown in Figure 1.
It is interconnected, is interconnected between chamber B12 by pipeline B8 phases by pipeline A7 between the chamber A11 of two compressed oil cylinders 5
It is logical, accumulator 4 is connected on pipeline B8.
Pipeline A7 and pipeline B8 port are connected to two interfaces of the three-position four-way valve with end；Three-position four-way valve is another
Two interfaces at end distinguish connecting line C9 and pipeline D10, and pipeline C9 is connected with hydraulic oil container 6, pipeline D10 and hydraulic oil container 6
Between be connected with hydraulic oil container 6 after combination gear pump 1 and overflow valve 2.
When drawing helicopter straight-line travelling, three-position four-way valve 3 is in middle position, and now pipeline A and pipeline B pass through three four
Port valve 3 is connected, so that three-position four-way valve 3, accumulator 4 and compressed oil cylinder 5 constitute the loop of a closure, when helicopter is turned
When, compressed oil cylinder 5 is exceeded the rated pressure that accumulator 4 is provided by the reaction force of wheel, and compressed oil cylinder 5 shrinks, and chamber A increases
Greatly, chamber B reduces, and the fluid in chamber B is compressed in accumulator 4, and fluid internal pressure rises, the volume provided until accumulator 4
Constant-pressure is equal to the reaction force of wheel, and now chamber A space stops change, and compressed oil cylinder 5 stops shrinking.
When helicopter returns to straight-line travelling from turning, compressed oil cylinder 5 is reduced by the reaction force of wheel, now system
Internal oil liquid pressure starts to reduce, and the release pressure oil liquid of accumulator 4 enters chamber B, and chamber B increases, chamber A reduce, and compressed oil cylinder 5 is stretched
Go out, until reaction force of the rated pressure equal to wheel that 4 accumulators are provided, oil system balance, compressed oil cylinder 5 stops stretching
Go out.In whole process, wheel can be by lasting pressure.
Three-position four-way valve 3 is controlled to arrive left position, pipeline D10 and pipeline A7 connections, pipeline B8 and pipeline C9 connections, hydraulic oil container
Oil in 6 is pumped into chamber A by gear pump 1, and compressed oil cylinder 5 is withdrawn, and wheel is released.
Three-position four-way valve 3 is controlled to arrive right position, pipeline D10 and pipeline B8 connections, pipeline A7 and pipeline C9 connections, hydraulic oil container
Oil in 6 is pumped into chamber B by gear pump 1, and compressed oil cylinder 5 is stretched out, and wheel is gradually held tightly.When thrust is excessive, overflow
Valve 2 is opened, and fluid flows back to hydraulic oil container 6, is protected wheel, is prevented from being subject to crushing.
As described above, given plan content in conjunction with the accompanying drawings and embodiments, can derive similar technical scheme.But
Every content without departing from technical solutions of the utility model, is made according to technical spirit of the present utility model to above example
Any simple modification, equivalent variations and modification, in the range of still falling within technical solutions of the utility model.
Claims (5)
1. a kind of helicopter tractor wheel compresses hydraulic system, it is characterised in that：Including two hydraulic cylinders, accumulator, three
Four-way valve, hydraulic pump and liquid reserve tank；Wherein hydraulic cylinder is divided into two cavitys by piston, and two hydraulic cylinders are provided with the cavity of piston rod
It is interconnected by pipeline, the cavity for being not provided with piston rod is interconnected by pipeline, leads to the pipe for being not provided with plunger
Accumulator is connected on road, the port of this two pipelines is connected to two interfaces of the three-position four-way valve with end；Three-position four-way valve
Two interfaces of the other end are connected with leading to the pipeline of liquid reserve tank, wherein a pipeline is provided with hydraulic pump.
2. helicopter tractor wheel compresses hydraulic system according to claim 1, it is characterised in that：In the 3-position 4-way
A pipeline for leading to liquid reserve tank is connected between valve and liquid reserve tank, the pipeline is provided with overflow valve.
3. helicopter tractor wheel compresses hydraulic system according to claim 1, it is characterised in that：The hydraulic cylinder is oil
Cylinder, the liquid reserve tank is fuel tank.
4. helicopter tractor wheel compresses hydraulic system according to claim 1, it is characterised in that：The hydraulic cylinder is oil
Cylinder, the liquid reserve tank is fuel tank.
5. hydraulic system is compressed according to any helicopter tractor wheel of Claims 1-4, it is characterised in that：The liquid
Press pump is gear pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621444912.9U CN206360947U (en) | 2016-12-27 | 2016-12-27 | A kind of helicopter tractor wheel compresses hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621444912.9U CN206360947U (en) | 2016-12-27 | 2016-12-27 | A kind of helicopter tractor wheel compresses hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206360947U true CN206360947U (en) | 2017-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621444912.9U Active CN206360947U (en) | 2016-12-27 | 2016-12-27 | A kind of helicopter tractor wheel compresses hydraulic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762879A (en) * | 2016-12-27 | 2017-05-31 | 青岛中汽特种汽车有限公司 | A kind of helicopter tractor wheel compresses hydraulic system |
-
2016
- 2016-12-27 CN CN201621444912.9U patent/CN206360947U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762879A (en) * | 2016-12-27 | 2017-05-31 | 青岛中汽特种汽车有限公司 | A kind of helicopter tractor wheel compresses hydraulic system |
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