CN205101307U - Engineering vehicle's bypass unloading device - Google Patents
Engineering vehicle's bypass unloading device Download PDFInfo
- Publication number
- CN205101307U CN205101307U CN201520827649.0U CN201520827649U CN205101307U CN 205101307 U CN205101307 U CN 205101307U CN 201520827649 U CN201520827649 U CN 201520827649U CN 205101307 U CN205101307 U CN 205101307U
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- Prior art keywords
- engineering vehicle
- control valve
- pressure
- valve
- filler opening
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Abstract
The utility model discloses an engineering vehicle's bypass unloading device, include: the first control valve, it has oil inlet, oil -out and feedback port to can whether communicate with the oil -out according to poor its oil inlet of change control of the hydraulic pressure between its oil inlet and the feedback port, the overload pressure when being in the slow -speed of revolution for the engine that is less than or equal to engineering vehicle is established to overflow valve, its overflow pressure, control unit, its oil inlet pressure that is used for making the first control valve is less than the pressure of its feedback port, or is used for being increased to when being greater than the default at the flow of engineering vehicle's work oil circuit, and the oil inlet pressure that makes the first control valve is less than the pressure of its feedback port, when engineering vehicle's engine was in the slow -speed of revolution, the first control valve flow that the hydraulic oil process of engineering vehicle's work oil circuit was opened was to the overflow valve. The utility model provides an engineering vehicle engine when the slow -speed of revolution the engine that the arouses flame -out problem that overloads because the load is too big.
Description
Technical field
The utility model relates to a kind of relief arrangement, particularly relates to a kind of bypass relief arrangement of engineering vehicle.
Background technique
At present, after the motor type selecting of engineering vehicle, some motor driving force when the slow-speed of revolution is inadequate, be actually slow-speed of revolution overload, this easy engine knock or flame-out situation, and car load during engine knock, can be caused to occur the seismism being difficult to accept, greatly reduce the travelling comfort that driver takes.
China Patent No. be 201420587007.3 utility model patent disclose a kind of control gear preventing low engine speeds flame-out, although it can prevent from stopping working during low engine speeds, but its control gear adopting the parts such as controller, guide's safety switch, safety valve, Proportional valve, speed probe to form, exist complex structure, cost high, control the deficiencys such as loaded down with trivial details.
Model utility content
The utility model provides a kind of bypass relief arrangement of engineering vehicle, occurs or the problem such as engine misses, also have the features such as structure is simple, cost is low when it not only solves the low engine speeds of engineering vehicle.
The utility model solves the technological scheme that its technical problem adopts: a kind of bypass relief arrangement of engineering vehicle, and it comprises:
First control valve, it has filler opening, oil outlet and feedback port, and whether can be communicated with oil outlet according to its filler opening of hydraulic difference change control between its filler opening and feedback port;
Relief valve, its oil pressure relief is set to the overload pressure when motor being less than or equal to engineering vehicle is in the slow-speed of revolution;
Controlling component, its pressure for making the inlet pressure of the first control valve be less than its feedback port, or for the flow of the working oil path at engineering vehicle be increased to be greater than predefined value time, make the inlet pressure of the first control valve be less than the pressure of its feedback port;
Filler opening and the feedback port of the first control valve are communicated with the working oil path of engineering vehicle respectively, the oil outlet of the second control valve is communicated with the filler opening of relief valve, the oil outlet of relief valve is communicated with the fuel tank of engineering vehicle, when the motor of engineering vehicle is in the slow-speed of revolution, the hydraulic oil of the working oil path of engineering vehicle flows to relief valve through the first control valve opened.
In one embodiment, described controlling component is the second control valve, and it has filler opening and oil outlet, and makes its oil outlet pressure be less than its inlet pressure by current limliting; The filler opening of described first control valve is communicated with the working oil path of engineering vehicle by this second control valve.
In one embodiment, described first control valve is check valve.
In one embodiment, described second control valve is throttle valve.
In one embodiment, the feedback port of described first control valve and the filler opening of described second control valve adopt tee union to coordinate oil pipe to connect the working oil path of engineering vehicle.
Compared to prior art, the utility model has following beneficial effect:
1, the first control valve of the present utility model coordinates relief valve can be in the slow-speed of revolution at the motor of engineering vehicle, and the pressure that the hydraulic system of engineering vehicle produces is when being greater than overload pressure when motor is in the slow-speed of revolution, off-load is carried out to the working oil path of engineering vehicle, there is the phenomenon that pinking is even stopped working when avoiding the low engine speeds of engineering vehicle to work, therefrom eliminate the phenomenon of the crew comfort reduction because of pinking generation during low engine speeds;
2, component of the present utility model few (comprising the first control valve, relief valve and controlling component), and controlling component preferably adopts the second control valve, has the features such as structure is simple, cost is low, control is convenient;
3, the first control valve of the present utility model preferably adopts check valve, and the second control valve preferably adopts throttle valve, reduce further cost of production, and controls more simple, direct.
Below in conjunction with drawings and Examples, the utility model is described in further detail; But the bypass relief arrangement of a kind of engineering vehicle of the present utility model is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
The bypass relief arrangement of a kind of engineering vehicle of the present utility model, it induced pressure size and specific flow can carry out the bypass off-load of hydraulic control system, thus stability when ensureing the low engine speeds 700rpm ~ N of engineering vehicle, prevent pinking, the generation of flame-out situation.N is 1100 ~ 1300rpm, specifically depends on the performance of motor.As shown in Figure 1, the utility model comprises:
First control valve, it has filler opening, oil outlet and feedback port, and whether can be communicated with oil outlet according to its filler opening of hydraulic difference change control between its filler opening and feedback port;
Relief valve 3, its oil pressure relief is set to the overload pressure when motor being less than or equal to engineering vehicle is in the slow-speed of revolution; Here, " being less than " is preferably and is slightly less than, and during to ensure that the pressure that the hydraulic system of engineering vehicle produces is not greater than the overload pressure of motor, the hydraulic system of engineering vehicle can full load go to perform hydraulic function substantially;
Controlling component, when its flow for the working oil path at engineering vehicle is increased to and is greater than predefined value, makes the inlet pressure of the first control valve be less than the pressure of its feedback port;
Filler opening and the feedback port of the first control valve are communicated with the working oil path of engineering vehicle respectively, the oil outlet of the second control valve is communicated with the filler opening of relief valve 3, the oil outlet of relief valve 3 is communicated with the fuel tank of engineering vehicle, when the motor of engineering vehicle is in the slow-speed of revolution, the hydraulic oil of the working oil path of engineering vehicle flows to relief valve 3 through the first control valve opened, otherwise the first control valve is closed.
In the present embodiment, described controlling component is the second control valve, and it has filler opening and oil outlet, and makes its oil outlet pressure be less than its inlet pressure by current limliting; The filler opening of described first control valve is communicated with the working oil path of engineering vehicle by this second control valve.
In the present embodiment, described first control valve preferably adopts check valve, and is specially two check valves 2.
In the present embodiment, described second control valve is throttle valve 1, and the feedback port of the filler opening of this throttle valve 1 and two check valves 2 specifically adopts tee union to coordinate oil pipe to connect the working oil path of engineering vehicle.
In Fig. 1, P point represents the pressure source from the working oil path of the hydraulic system of engineering vehicle, the feedback port of one end of F point expression two check valves 2, the filler opening of B point expression two check valves 2, the oil outlet of C point expression two check valves 2, a port of the other end of G point expression two check valves 2, this port is communicated with the filler opening B of two check valves 2; The filler opening of D point epi-position relief valve 3, E point represents the oil outlet of relief valve 3, and H point represents the feedback port of relief valve 3; A point is between the pressure source P and throttle valve 1 of bypass, is also the tie point of the working oil path of the feedback port F connection engineering vehicle of two check valves 2 simultaneously.
When the motor of engineering vehicle is in slow-speed of revolution working state, and the hydraulic system of engineering vehicle is when starting working, the pressure of the working oil path of hydraulic system reaches pressure source P place, shunt at A point, a small amount of fluid arrives the feedback port F of two check valves 2 through oil hydraulic circuit, thus forms active force at F end.The a large amount of fluid in A place arrives the filler opening B of two check valves 2 by throttle valve 1.Because the flow of the now hydraulic system of engineering vehicle is less, thus, throttle valve 1 does not carry out current limliting, and the fluid flowing through throttle valve 1 is equal at the pressure at A place and B place.Because the filler opening B of two check valves 2 is connected with the feedback port G of its other end, thus, a small amount of fluid at B place can arrive the feedback port G of two check valve 2 the other ends by oil hydraulic circuit, thus forms active force at G end.Because the pressure at G place is equal with B place constantly, the pressure at F place is equal with A place, and the pressure at A place and B place is equal, therefore, the pressure at F place is equal with the pressure at G place (now, hydraulic difference between the filler opening of two check valves 2 and feedback port is 0), the active force that the F of two check valves 2 is held is not enough to overcome G and holds active force and spring force, two check valves 2 are in normally open, a large amount of fluid at B place arrive the oil outlet C of two check valves 2 by the internal path of two check valves 2, the fluid at C place all can arrive the filler opening D of relief valve 3.A small amount of fluid at D place arrives the feedback port H of relief valve 3 through oil hydraulic circuit, thus forms active force at H place.When the active force at H place arrives greatly the oil pressure relief of relief valve 3 setting, relief valve 3 is opened, and makes the fluid at D place arrive the oil outlet E of relief valve 3, and flows back to fuel tank, with this, bypass off-load is carried out to the working oil path of engineering vehicle, avoid the motor of engineering vehicle to overload when the slow-speed of revolution works.When H active force is just less than the oil pressure relief (this oil pressure relief is less than or equal to the overload pressure of the motor of engineering vehicle) of relief valve 3 setting, relief valve 3 cuts out, the bypass unloading function being equivalent to engineering vehicle is closed, now, the working oil path of engineering vehicle can full load be gone to perform hydraulic function when low engine speeds operates.
Except can allow except bypass off-load from the pressure at P place, when the flow at P place be increased to be greater than predefined value time, the fluid flowing through throttle valve 1, at the pressure no longer equal (throttle valve 1 carries out current limliting) at A place and B place, produces certain pressure reduction △ P.The pressure at G place is equal with B place constantly, the pressure at F place is equal with A place (now, hydraulic difference between the filler opening of two check valves 2 and feedback port becomes △ P), because pressure reduction △ P makes the active force at two check valve 2 two ends unequal, wherein F holds active force to be greater than G end.When the active force of F end is greatly to when overcoming G end active force and spring force, the working position transposition of two check valves 2, become stop-pass from often opening, the fluid at B place again flows the oil outlet C less than two check valves 2, unloading function is subsequently closed, and car load can full load be gone to perform hydraulic function.Owing to using the engineering vehicle of oil hydraulic pump, its flow is all increase along with the increase of engine speed.Thus, when the flow of the working oil path of engineering vehicle increases, the rotating speed also corresponding increase of motor, now, even if load is large again, the situation that motor also there will not be rotary speed unstabilization fixed.
Bypass relief arrangement shown in Fig. 1 is got involved the working oil path of engineering vehicle by the utility model, and make the working oil path of engineering vehicle have when low engine speeds, hydraulic system has bypass unloading function.When engine speed is increased to certain rotating speed, the bypass unloading function of hydraulic system is closed.
The utility model solves engineering vehicle engine under low speed state, and the motor overload stall that cause excessive due to load or the flame-out problem of engine overload.
In other embodiment, described controlling component also can, when the flow of the working oil path of engineering vehicle is arbitrary value, make the inlet pressure of the first control valve be less than the pressure of its feedback port all the time.
The bypass relief arrangement of a kind of engineering vehicle of the present utility model, it can be applicable to the engineering vehicle such as fork truck, hydraulic shovel.
Above-described embodiment is only used for further illustrating the bypass relief arrangement of a kind of engineering vehicle of the present utility model; but the utility model is not limited to embodiment; every above first control valve, controlling component are done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all fall in the protection domain of technical solutions of the utility model.
Claims (5)
1. a bypass relief arrangement for engineering vehicle, is characterized in that: it comprises:
First control valve, it has filler opening, oil outlet and feedback port, and whether can be communicated with oil outlet according to its filler opening of hydraulic difference change control between its filler opening and feedback port;
Relief valve, its oil pressure relief is set to the overload pressure when motor being less than or equal to engineering vehicle is in the slow-speed of revolution;
Controlling component, its pressure for making the inlet pressure of the first control valve be less than its feedback port, or for the flow of the working oil path at engineering vehicle be increased to be greater than predefined value time, make the inlet pressure of the first control valve be less than the pressure of its feedback port;
Filler opening and the feedback port of the first control valve are communicated with the working oil path of engineering vehicle respectively, the oil outlet of the second control valve is communicated with the filler opening of relief valve, the oil outlet of relief valve is communicated with the fuel tank of engineering vehicle, engineering vehicle motor be in the slow-speed of revolution time, the hydraulic oil of the working oil path of engineering vehicle flows to relief valve through the first control valve opened.
2. the bypass relief arrangement of engineering vehicle according to claim 1, is characterized in that: described controlling component is the second control valve, and it has filler opening and oil outlet, and makes its oil outlet pressure be less than its inlet pressure by current limliting; The filler opening of described first control valve is communicated with the working oil path of engineering vehicle by this second control valve.
3. the bypass relief arrangement of engineering vehicle according to claim 1 and 2, is characterized in that: described first control valve is check valve.
4. the bypass relief arrangement of engineering vehicle according to claim 2, is characterized in that: described second control valve is throttle valve.
5. the bypass relief arrangement of engineering vehicle according to claim 2, is characterized in that: the feedback port of described first control valve and the filler opening of described second control valve adopt tee union to coordinate oil pipe to connect the working oil path of engineering vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520827649.0U CN205101307U (en) | 2015-10-23 | 2015-10-23 | Engineering vehicle's bypass unloading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520827649.0U CN205101307U (en) | 2015-10-23 | 2015-10-23 | Engineering vehicle's bypass unloading device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205101307U true CN205101307U (en) | 2016-03-23 |
Family
ID=55517089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520827649.0U Withdrawn - After Issue CN205101307U (en) | 2015-10-23 | 2015-10-23 | Engineering vehicle's bypass unloading device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205101307U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673605A (en) * | 2015-10-23 | 2016-06-15 | 林德（中国）叉车有限公司 | Bypass unloading device and method for engineering vehicle |
| CN113830059A (en) * | 2021-09-29 | 2021-12-24 | 徐工集团工程机械股份有限公司科技分公司 | Control valve, wet brake system and control method |
-
2015
- 2015-10-23 CN CN201520827649.0U patent/CN205101307U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673605A (en) * | 2015-10-23 | 2016-06-15 | 林德（中国）叉车有限公司 | Bypass unloading device and method for engineering vehicle |
| CN105673605B (en) * | 2015-10-23 | 2018-03-23 | 林德（中国）叉车有限公司 | The bypass relief arrangement and unloading method of a kind of engineering truck |
| CN113830059A (en) * | 2021-09-29 | 2021-12-24 | 徐工集团工程机械股份有限公司科技分公司 | Control valve, wet brake system and control method |
| CN113830059B (en) * | 2021-09-29 | 2022-07-29 | 徐工集团工程机械股份有限公司科技分公司 | Control valve, wet brake system and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160323 Effective date of abandoning: 20180323 |