CN107940050B - Pressure limiting valve of hydrostatic drive system - Google Patents
Pressure limiting valve of hydrostatic drive system Download PDFInfo
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- CN107940050B CN107940050B CN201710941728.8A CN201710941728A CN107940050B CN 107940050 B CN107940050 B CN 107940050B CN 201710941728 A CN201710941728 A CN 201710941728A CN 107940050 B CN107940050 B CN 107940050B
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- limiting valve
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- pressure medium
- discharge line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0446—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces
- F16K17/046—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces the valve being of the gate valve type or the sliding valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0473—Multiple-way safety valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/048—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded combined with other safety valves, or with pressure control devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
- G05D16/103—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger the sensing element placed between the inlet and outlet
- G05D16/106—Sleeve-like sensing elements; Sensing elements surrounded by the flow path
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Safety Valves (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a pressure-limiting valve (1) of a hydrostatic drive system, which is connected on the input side to a pressure medium line (2) and on the output side to a discharge line (3), wherein the pressure-limiting valve (1) has: a shut-off position (SP), in which the connection of the pressure medium line (2) to the discharge line (3) is shut off; an Open Position (OP) in which the pressure medium line (2) communicates with the discharge line (3). The pressure-limiting valve (1) is connected to at least one additional discharge line (ZL; ZL1, ZL2) and the pressure-limiting valve (1) has a control position (ST; ST1, ST2) for each additional discharge line (ZL; ZL1, ZL2), in which the pressure medium line (2) communicates with the additional discharge line (ZL; ZL1, ZL 2).
Description
Technical Field
The invention relates to a pressure-limiting valve of a hydrostatic drive system, which is connected on the input side to a pressure medium line and on the output side to a discharge line, wherein the pressure-limiting valve has: a shut-off position in which the connection of the pressure medium line to the discharge line is shut off; and an open position in which the pressure medium line communicates with the discharge line.
Background
A pressure limiting valve is installed in the hydrostatic drive system in order to limit the maximum system pressure and thus prevent mechanical damage to components of the hydrostatic drive system. The known pressure limiting valve is designed as a valve which compares the current system pressure in the pressure medium line of the drive system with a predetermined opening pressure at the pressure limiting valve, which opening pressure is usually predetermined by a spring bias of a spring acting in the direction of the blocking position. If the current system pressure acting in the direction of the open position exceeds the set opening pressure, the pressure-limiting valve is loaded into the open position, in which the pressure medium line communicates with the discharge line. The discharge line is typically connected to the container. The pressure-limiting valve can, in the open position, allow the pressure medium to flow out into the discharge line and thus to the container for so long as the system pressure in the pressure medium line is again below the set opening pressure.
Directly actuated pressure relief valves are known in which a spring acting in the direction of a blocking position and specifying an opening pressure acts directly on the valve body of the pressure relief valve. In such directly controlled pressure limiting valves, a large increase in the system pressure to be ensured occurs via the pressure limiting valve in the case of large flows, so that the directly controlled pressure limiting valve is used only for small flows. In order to ensure that the system pressure to be ensured by the pressure limiting valve does not rise sharply even in the event of high flow rates, two-stage pressure limiting valves, so-called pilot pressure limiting valves, are known. In such pilot-controlled pressure-limiting valves, the pilot-controlled valve (which is designed as a small pilot-controlled pressure-limiting valve) detects the current system pressure and opens the main pressure-limiting valve when required. In such a pilot-controlled pressure relief valve, a smaller flow dependence of the system pressure to be ensured is achieved, in which case the system pressure rises only slightly at high flows.
In the known pressure limiting valve, the pressure limiting valve has: a shut-off position in which the connection of the pressure medium line to the discharge line is shut off; and an open position in which the pressure medium line discharge line communicates (which discharge line is connected to the container), resulting in the system pressure in the pressure medium line being throttled relative to the container in the open position.
As long as in the open position of the pressure-limiting valve a throttling of the system pressure in the pressure medium line relative to the container is to be avoided and the pressure medium and thus the energy source is to be tapped from the pressure medium line into the pressure medium reservoir, this can be achieved by means of two pressure-limiting valves arranged in parallel, wherein the first pressure-limiting valve is open relative to the pressure medium reservoir and the second pressure-limiting valve is open relative to the container, whereby the first pressure-limiting valve throttles the pressure medium from the pressure medium line to the pressure medium reservoir and the second pressure-limiting valve throttles the pressure medium from the pressure medium line to the container when the pressure in the pressure medium reservoir has reached the opening pressure of the second pressure-limiting valve. In the case of a parallel connection of the two pressure-limiting valves, it is important that the first pressure-limiting valve (which is open with respect to the pressure medium reservoir) is set to a lower opening pressure than the second pressure-limiting valve, which is open with respect to the container, in order to ensure that the pressure medium reservoir is charged with pressure medium of the pressure medium line before the pressure medium is throttled from the pressure medium line to the container. However, due to the different opening pressures of the two parallel pressure-limiting valves, the system pressure in the pressure medium line is not constantly maintained, but rather a pressure increase occurs in the pressure medium line during the transition from the first pressure-limiting valve to the second pressure-limiting valve. For this purpose, a plurality of separate pressure limiting valves is required, which results in a higher structural expenditure and a higher position requirement for the pressure limiting valves.
Disclosure of Invention
The invention is based on the object of providing a pressure-limiting valve of the type mentioned at the outset which enables energy recovery without the disadvantages mentioned above.
According to the invention, this object is achieved by: the pressure-limiting valve is connected to at least one additional discharge line and has a control position for each additional discharge line, in which control position the pressure medium line communicates with the additional discharge line. The pressure-limiting valve according to the invention is thus connected on the input side to the pressure medium line and on the output side to the discharge line and to the at least one additional discharge line, so that it can connect the pressure medium line to the at least one additional discharge line or discharge line. Energy recovery can be achieved by the communication of the at least one additional discharge line and the pressure medium line with the respective additional discharge line in the respective control position. The pressure limiting valve according to the invention thus combines the functions of a plurality of pressure limiting valves connected in parallel into a single pressure limiting valve with low structural expenditure and low space requirement.
According to an advantageous embodiment of the invention, the at least one control position is arranged between a blocking position and an open position. In this way, when the pressure-limiting valve is open, energy recovery can be achieved in at least one control position before the pressure-limiting valve is loaded into an open position in which pressure medium flows out of the pressure medium line into the discharge line.
A particular advantage results when, according to a development of the invention, the pressure-limiting valve is designed as a pilot-controlled pressure-limiting valve and a pilot-controlled valve, in particular a pilot-controlled pressure-limiting valve (which controls the opening pressure of the pressure-limiting valve), is provided. The pressure-limiting valve can be pre-set without pressure jumps occurring during the transition between the control positions and from the control position to the open position.
According to an advantageous embodiment of the invention, a pressure medium reservoir is connected to each additional discharge line. Energy recovery can be achieved in a simple manner in at least one control position by loading a pressure medium reservoir or a plurality of pressure medium reservoirs.
In one embodiment of the pressure-limiting valve, the pressure-limiting valve is connected to n additional outlet lines, which are each connected to a pressure medium reservoir, wherein n ≧ 2, which is suitable for the pressure of the pressure medium reservoir and the outlet pressure of the outlet line,
p1＞p2＞pn＞pA，
and the pressure limiting valve passes n control positions in succession when the pressure control valve communicates the pressure medium line with the discharge line in the open position. In the case of a pressure-limiting valve reaction, the pressure medium reservoirs are thus charged successively with pressure medium starting from the pressure medium reservoir set to the highest pressure p1 in the pressure-limiting valve connected to the n additional discharge lines, and the pressure medium lines communicate with the discharge lines when all the pressure medium reservoirs are charged.
According to an advantageous embodiment of the invention, the pressure limiting valve has a valve body which is arranged so as to be longitudinally displaceable in a housing bore, which is connected to the pressure medium line, wherein at least one additional discharge line and the discharge line are connected to the housing bore, and for controlling the connection of the housing bore to the at least one additional discharge line and the discharge line, the valve body has a control slot in each case, wherein the control slot in the blocking position of the pressure limiting valve has a positive cover in each case with respect to the connection of the at least one additional discharge line and the discharge line, wherein the cover with respect to the at least one additional discharge line is smaller than the cover with respect to the discharge line. This can be achieved in a simple manner by a corresponding arrangement and thus the position of the control slot in the valve body, with the pressure-limiting valve open, the pressure medium line being connected to the at least one additional discharge line before the pressure-limiting valve reaches the open position, in which the pressure medium line is connected to the discharge line.
In one embodiment of the pressure limiting valve, the pressure limiting valve is connected to n additional discharge lines, where n ≧ 2, and for the covering:
U1＜U2＜Un＜UA。
by the design of the cover, this is achieved in a simple manner by controlling the respective position of the notches on the valve body: in the case of a corresponding longitudinal displacement of the valve body, the additional discharge lines are actuated one after the other by means of the corresponding control slots before the open position is reached in the open pressure limiting valve.
Drawings
Further advantages and details of the invention are explained in detail by means of embodiments shown in the schematic drawings. Shown here are:
FIG. 1 is a circuit diagram of a pressure limiting valve according to the invention and
fig. 2 is a longitudinal section through a pressure limiting valve according to the invention.
Detailed Description
Fig. 1 shows a circuit diagram of a pressure limiting valve 1 according to the invention of a hydrostatic drive system.
The pressure-limiting valve 1 is connected on the input side to a pressure medium line 2 and on the output side to a discharge line 3. The discharge line 3 is connected to a container 4. The pressure-limiting valve 1 has a stop position SP in which the connection of the pressure medium line 2 to the discharge line 3 is stopped. The pressure-limiting valve 1 furthermore has an open position OF in which the pressure medium line 2 communicates with the discharge line 3.
According to the invention, the pressure-limiting valve 1 is connected to at least one additional discharge line ZL, which in the embodiment shown in fig. 1 is connected to the additional discharge line ZL to which the pressure medium reservoir DM is connected.
The pressure-limiting valve 1 has for each additional discharge line ZL a control position ST in which the pressure medium line 2 communicates with the additional discharge line ZL.
At least one control position ST is arranged between the cut-off position SP and the open position OF.
Furthermore, in the pressure limiting valve 1 according to the invention, the connection of the pressure medium line 2 to the at least one additional discharge line ZL is blocked in the blocking position SP. In at least one control position ST, the communication of the pressure medium line 2 to the discharge line 3 is blocked. In the open position OF, the connection OF the pressure medium line 2 to at least one additional discharge line ZL is opened.
The pressure limiting valve 1 according to the invention is designed as a pilot-controlled pressure limiting valve, wherein a pilot-controlled valve 10 is provided, which controls the opening pressure of the pressure limiting valve 1. The pilot control valve 10 is designed as a pilot control pressure relief valve 11, which is connected on the input side to a control line 12, which is connected to a control pressure surface 13 of the pressure relief valve 1, which surface acts in the direction of the stop position SP. The control line 12 is connected to the pressure medium line 2 by means of a branch line 14. The preset pressure-limiting valve 11 is connected on the outlet side to the container 4. The preset pressure-limiting valve 11 is loaded by a spring 15 into the blocking position and in the open position by the pressure in the control line 12.
A throttle 16, for example a diaphragm, can be arranged in the branch pipe 14, and a throttle 17, for example a diaphragm, can be arranged in the control line 12.
The pressure-limiting valve 1 is loaded in the direction OF the open position OF by the system pressure in the pressure medium line 12. For this purpose, the control pressure surface 18 OF the pressure-limiting valve 1, which surface acts in the direction OF the open position OF, is connected to the pressure medium line 2.
If the system pressure p0 in the pressure medium line 2 exceeds the opening pressure of the preset pressure-limiting valve 11, which is predetermined by the spring bias of the spring 15, the pressure-limiting valve 1 is initially charged, starting from the blocking position SP, into the control position ST, in which the pressure medium line 2 is open to the additional discharge line ZL and the pressure medium reservoir DM is charged. As soon as the pressure medium reservoir DM is filled and loaded at a pressure P1 (which is higher than the discharge pressure pA in the discharge line 3 and lower than the system pressure P0), the pressure-limiting valve 1 is loaded, starting from the control position ST, into the open position OF, in which the pressure medium line 2 opens into the discharge line 3, so that pressure medium is discharged from the pressure medium line 2 into the container 4. No pressure jumps occur in the event OF a transition from the control position ST to the open position OF by means OF a pre-regulation, which is produced by a pre-regulation OF the pre-regulation valve 10 and a stepless opening to the discharge line 3.
Fig. 2 shows a longitudinal section through a pressure-limiting valve 1 according to the invention. The same components as in fig. 1 are provided with the same reference numerals.
The pressure-limiting valve 1 of fig. 2 is connected to n additional discharge lines ZL1, ZL2, which are connected to pressure medium reservoirs DM1, DM2, respectively, where n is equal to 2.
The pressure limiting valve 1 has a valve body 21 which is longitudinally displaceable in a housing bore 20. The housing bore 20 has a pressure medium line 2, a discharge line 3 and additional discharge lines ZL1, ZL2 connected thereto. The discharge line 3 and the additional discharge lines ZL1, ZL2 are formed by corresponding transverse bores in the housing bore 20, which are spaced apart from one another in the longitudinal direction of the housing bore 20.
Fig. 2 also shows a spring 22, which acts on the valve body 21 in the direction of the illustrated blocking position SP.
The valve body 21 has a control notch 25 for controlling the connection of the housing bore 20 to the additional discharge line ZL 1. The control slot 25 is formed in the illustrated embodiment by the end face of the valve body 21. In addition, the valve body 21 has a control slot 26 for connecting the control housing bore 20 to the additional discharge line ZL 2. The control slot 26 is formed in the illustrated embodiment by a plurality of transverse bores in the valve body 21. Furthermore, the valve body 21 has a control slot 27 for controlling the connection of the housing bore 20 to the discharge line 3. The control slot 27 is formed in the illustrated embodiment by a plurality of transverse bores in the valve body 21.
The control slot 25 has a positive cover U1 in the illustrated blocking position SP of the pressure-limiting valve 1 with respect to the connection of the additional discharge line ZL 1. The control slot 26 has a positive cover U2 in the illustrated blocking position SP of the pressure-limiting valve 1 with respect to the connection of the additional discharge line ZL 2. The control slot 27 has a positive cover UA in the illustrated blocking position SP of the pressure-limiting valve 1 relative to the connection of the discharge line 3.
For the dimensions covering U1, U2 and UA, the following applies:
U1＜U2＜UA。
thereby defining the positions in relation to the control slots 25, 26, 27 which first open the output lines (additional discharge lines ZL1, ZL2, discharge line 3). Suitable for the pressures p1, p2 of the pressure medium reservoirs DM1, DM2 and the discharge pressure pA of the discharge line 3 in the embodiment of fig. 2 are:
p1＞p2＞pA。
as soon as the system pressure p0 in the pressure medium line 2 in the exemplary embodiment of fig. 2 exceeds the opening pressure of the pilot control valve 10, the pressure-limiting valve 1 therefore opens the connection of the pressure medium line 2 to the first additional discharge line ZL1 in the first control position ST1 via the control slot 25, so that the pressure medium reservoir DM1 is loaded at the pressure p 1. The pressure-limiting valve 1 then opens the connection of the pressure medium line 2 to the second additional discharge line ZL2 in the second control position ST2 via the control notch 26, so that the pressure medium reservoir DM2 is loaded at the pressure p 2. The pressure-limiting valve 1 then opens the connection OF the pressure medium line 2 to the discharge line 3 in the open position OF via the control slot 27, so that pressure medium flows out OF the pressure medium line 2 into the container 4. Thereby, the pressure-limiting valve 1 passes successively through the two control positions ST1, ST2 to successively load the pressure medium reservoirs DM1 and DM2 before the pressure-limiting valve 1 communicates the pressure medium line 2 with the discharge line 3 in the open position OF.
The pressure limiting valve 1 according to the invention thus has the function of a plurality of pressure limiting valves connected in parallel and provides an integrated selection function. With the pressure limiting valve 1 according to the invention, it is thus possible to recover energy from the pressure medium line 2 into the additional discharge line ZL or into a plurality of additional discharge lines ZL1, ZL2 and thus into the pressure medium reservoir DM or a plurality of pressure medium reservoirs DM1, DM2 (for example in the case of user braking) with low structural expenditure and low space requirement. When the pressure limiting valve 1 is opened for the next stage, no pressure increase occurs in the pressure limiting valve 1 according to the invention and therefore no reaction is caused to the system pressure P0 which is located in the pressure medium line 2 and is to be limited.
Claims (7)
1. Pressure-limiting valve (1) of a hydrostatic drive system, which limits the maximum system pressure of the hydrostatic drive system, the pressure-limiting valve (1) being connected on the input side to a pressure medium line (2) and on the output side to a discharge line (3), which is connected to a tank (4), wherein the pressure-limiting valve (1) has: a shut-off position (SP) in which the connection of the pressure medium line (2) to the discharge line (3) is shut off; and an open position in which the pressure medium line (2) communicates with the discharge line (3) connected to the vessel (4), wherein the pressure-limiting valve (1) is connected to at least two additional discharge lines (ZL; ZL1, ZL2), a pressure medium reservoir (DM; DM1, DM2) is connected to each additional discharge line (ZL; ZL1, ZL2), and the pressure-limiting valve (1) has, for each additional discharge line (ZL; ZL1, ZL2), a control position (ST; ST1, ST2) in which the pressure medium line (2) communicates with the additional discharge line (ZL; ZL1, ZL2), energy recovery in the respective control position (ST; ST1, ZL2) being made possible by loading the pressure medium reservoir (DM; DM1, DM2) with pressure medium from the pressure medium line (2), the pressure-limiting valve (1) has a valve body (21) which can be moved longitudinally in a housing bore (20), the housing bore (20) being connected to the pressure medium line (2) and the discharge line (3), wherein the at least two additional discharge lines (ZL; ZL1, ZL2) are connected to the housing bore (20), and wherein, when the pressure in the pressure medium line (2) exceeds the opening pressure OF the pressure-limiting valve (1), the pressure medium moves the valve body (21) in order to pass two control positions (ST; ST1, ST2) in succession in order to load the pressure medium reservoir (DM; DM1, DM2) in succession, and then into an open position (OF) in order to connect the pressure medium line (2) to the container (4).
2. Pressure limiting valve according to claim 1, characterized in that at least two control positions (ST; ST1, ST2) are arranged between the cut-off position (SP) and the open position (OF).
3. The pressure limiting valve according to claim 1 or 2, characterized in that the pressure limiting valve (1) is configured as a preset pressure limiting valve and a preset valve (10) is provided, which controls the opening pressure of the pressure limiting valve (1).
4. The pressure limiting valve according to claim 1 or 2, characterized in that the pressure limiting valve (1) is connected to n additional discharge lines (ZL; ZL1, ZL2) which are each connected to a pressure medium reservoir (DM; DM1, DM2), and the pressure p1, p2 of the pressure medium reservoir (DM; DM1, DM2) and the discharge pressure pA of the discharge line (3) are adapted:
p1 > p2 > pn > pA, where pn is the pressure of the pressure medium reservoir adjoining the nth additional discharge line, where n is greater than 2,
and that the pressure-limiting valve (1) passes n control positions (ST; ST1, ST2) in succession before the pressure-limiting valve (1) connects the pressure medium line (2) with the discharge line (3) in the open position (OF).
5. Pressure limiting valve according to claim 1 or 2, characterized in that, for controlling the connection of the housing bore (20) with the at least two additional discharge lines (ZL; ZL1, ZL2) and the discharge line (3), the valve body (21) has a control slot (25, 26, ZL 27), respectively, wherein the control slot (25, 26, ZL 27) has, in the shut-off position (SP) of the pressure limiting valve (1), a positive coverage UA relative to the positive coverage U1, U2 of the at least two additional discharge lines (ZL; ZL1, ZL2) and the connection of the discharge line (3), respectively, wherein the positive coverage U1, U2 relative to the at least two additional discharge lines (ZL 1, ZL2) is smaller than the positive coverage UA relative to the discharge line (3).
6. The pressure limiting valve according to claim 5, characterized in that the pressure limiting valve (1) is connected to n additional discharge lines (ZL; ZL1, ZL2) and the applicable dimensions for the covers U1, U2, UA are:
u1 < U2 < Un < UA, where Un is that the control slot has a positive coverage Un relative to the nth additional discharge line in the blocking position of the pressure-limiting valve (1), where n is greater than 2.
7. Pressure limiting valve according to claim 3, characterized in that the preset valve (10) comprises a preset pressure limiting valve (11).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016119416.6A DE102016119416A1 (en) | 2016-10-12 | 2016-10-12 | Pressure relief valve of a hydrostatic drive system |
| DE102016119416.6 | 2016-10-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107940050A CN107940050A (en) | 2018-04-20 |
| CN107940050B true CN107940050B (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710941728.8A Active CN107940050B (en) | 2016-10-12 | 2017-10-11 | Pressure limiting valve of hydrostatic drive system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107940050B (en) |
| DE (1) | DE102016119416A1 (en) |
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- 2016-10-12 DE DE102016119416.6A patent/DE102016119416A1/en not_active Withdrawn
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| WO1997013972A1 (en) * | 1995-10-10 | 1997-04-17 | Alliedsignal Inc. | Combined pressurizing, flow measuring and flow splitting valve |
| CN102635604A (en) * | 2011-02-14 | 2012-08-15 | 林德材料控股有限责任公司 | Hydrostatic drive system |
| CN103256265A (en) * | 2012-02-16 | 2013-08-21 | 林德材料处理有限责任公司 | Hydrostatic drive system |
| CN104520620A (en) * | 2012-08-13 | 2015-04-15 | 罗伯特·博世有限公司 | Pressure-limiting valve and hydrostatic traction drive |
| CN104061202A (en) * | 2013-03-18 | 2014-09-24 | 林德液压两合公司 | Hydraulic control device of lifting cylinder of movable working machine |
| CN105378298A (en) * | 2013-07-24 | 2016-03-02 | 舍弗勒技术股份两合公司 | Hydraulic system |
| CN104712755A (en) * | 2013-12-13 | 2015-06-17 | 林德液压两合公司 | Hydrostatic drive with energy storage |
| CN104709065A (en) * | 2013-12-13 | 2015-06-17 | 林德液压两合公司 | Hydrostatic hybrid drive device for a hybrid drive train |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016119416A9 (en) | 2018-05-24 |
| DE102016119416A1 (en) | 2018-04-12 |
| CN107940050A (en) | 2018-04-20 |
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