JP7277890B1 - Low-pressure side regulator of fluid power transmission device and fluid power source - Google Patents

Abstract

Kind Code: A1 A completely closed circuit type actuator having a pipe that connects an actuator that converts liquid power into an operating force that moves a target moving body, and a fluid power generation source that supplies the operating liquid to the actuator in a completely closed circuit. To use a relatively inexpensive and general fluid power generation source in a liquid power transmission device. A regulator (50) is provided in a pipe (31) on the low-pressure side of a fluid power generation source (20) for absorbing a volume change of a working liquid (3). [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fluid power transmission devices and low-side regulators for fluid power generation sources (eg, pumps).

Conventionally, an actuator (for example, a cylinder) that converts liquid power into an actuation force that moves a target moving body,
a fluid power source (e.g., a pump) that supplies actuating liquid to the actuator;
a pipe connecting the actuator and a fluid power generation source;
is generally known.

Since this conventional general liquid power transmission device (e.g., hydraulic device) is an open circuit type in which a part of the circuit is open to the atmosphere, a relatively inexpensive and general pump can be used as a fluid power generation source. is possible.

However, since it is an open circuit type, it has the following drawbacks.
For example, in the case of hydraulic circuits, most failures in the hydraulic system are caused by air and foreign matter.
(1) Dust (dust and foreign matter) enters from the outside.
(2) Oxidative deterioration of hydraulic oil progresses.
(3) There is air separation by opening to the atmosphere.
This is very important and
Air bubbles in hydraulic systems cause all sorts of problems, reducing controllability, stability, reducing equipment life and reducing energy efficiency.

In particular, the adverse effects of air in oil include the following. Occurrence of damage due to deterioration of lubricity Occurrence of cavitation Occurrence of cavitation Decreased hydraulic efficiency including pump Malfunction due to increased oil compressibility Occurrence of noise Accelerated deterioration of lubricating oil Decreased cooling capacity

On the other hand, conventionally, there is known a technique of closing a circuit in order to solve the above problems.
By adopting the closed circuit type, the above problem is eliminated.
In addition, in the case of a hydraulic system, there is a great advantage that a large oil reservoir (tank) required in the case of an open circuit type can be dispensed with.

However, conventional closed-circuit hydraulic power transmission devices cannot use relatively inexpensive general pumps.
This is because, if the circuit is closed, the performance of the pump deteriorates, that is, the discharge amount decreases as the suction pressure increases. In addition, damage to the seal of the pump (puncture, etc.) may occur.

Therefore, the conventional closed-circuit type hydraulic power transmission system uses a special and expensive pump, resulting in an expensive system as a whole.

In addition, for example, in Patent Document 1,
The task is to "suppress pressure fluctuations in the fluid circulation system and prevent various adverse effects such as cavitation."
"The temperature-controlled system 1 that performs temperature control using the heat medium liquid 2, and the temperature of the heat medium liquid 2 discharged from the temperature-controlled system 1 is adjusted and the temperature of the heat medium liquid 2 is adjusted as described above. a heat exchanger 3 that supplies the temperature controlled system 1; a circulation pump 10 that circulates the heat medium liquid 2 between the temperature controlled system 1 and the heat exchanger 3; the temperature controlled system 1; In a heat exchange system provided with heat medium pipes 6 and 8 connecting a heat exchanger 3 and a circulation pump 10 to circulate the heat medium liquid 2, the circulation path of the heat medium liquid 2 is connected to the outside air. On the other hand, it is characterized in that it is an isolated closed system and that a pressure absorbing means 11 for absorbing pressure fluctuations of the heat medium liquid 2 is arranged in the circulation path of the heat medium. Document summary column)
A heat exchange system is described.
That is, in the same document,
The point that the circulation path of the heat medium liquid 2 is a closed system isolated from the outside air,
Disposing a pressure absorbing means 11 for absorbing pressure fluctuations of the heat medium liquid 2 in the circulation path of the heat medium;
is described.

However, in FIG. 1 and paragraph 0019 of the same document, there is a description that "a check valve 17 is provided to introduce gas into the gas chamber 13 when the pressure in the gas chamber 13 of the expansion tank 12 falls below a predetermined pressure". , the circulation path of the heat medium liquid 2 in the document cannot be said to be a completely closed circuit.

JP-A-11-30467

The problem to be solved by the present invention is
an actuator that converts liquid power into an actuation force that moves a target moving body;
a fluid power source that supplies a working liquid to the actuator;
a pipe that connects the actuator and the fluid power generation source in a completely closed circuit;
In a completely closed circuit type hydraulic power transmission device having
To make it possible to use a relatively inexpensive and common fluid power generation source.

In order to solve the above problems, the fluid power transmission device of the present invention includes:
an actuator that converts liquid power into an actuation force that moves a target moving body;
a fluid power source that supplies a working liquid to the actuator;
a pipe that connects the actuator and the fluid power generation source in a completely closed circuit;
A completely closed circuit type hydraulic power transmission device having
It is characterized in that a regulator for absorbing a volume change of the working liquid is provided in a pipe on the low-pressure side of the fluid power generation source.

Since this fluid power transmission device has the above configuration, the following effects can be obtained.
A fluid power generation source supplies an actuation liquid to an actuator, and the actuator converts the liquid power into an actuation force to move a target moving body.
Since the piping connecting the actuator and the fluid power generation source is in the form of a completely closed circuit, the above-described effect of the closed circuit (the effect of resolving the problems caused by the open circuit) can be obtained.
In the case where the piping connecting the actuator and the fluid power generation source forms a completely closed circuit, if a relatively inexpensive and general fluid power generation source is used without taking any measures, the fluid On the low-pressure side of the power source, pressure fluctuations occur due to changes in the volume of the working liquid, which can lead to destruction of the fluid power source due to cavitation erosion and seal failure.
On the other hand, according to the present invention, since the piping on the low-pressure side of the fluid power generation source is provided with a regulator that absorbs the volume change of the working liquid, Pressure fluctuations due to volume changes of the liquid are suppressed.
Therefore, it is possible to prevent destruction of the fluid power generation source due to the cavitation erosion phenomenon and seal destruction, and as a result, in the completely closed circuit type liquid power transmission device, a relatively inexpensive and general fluid power generation source can be used. become able to.

Further, in order to solve the above problems, the fluid power transmission device of the present invention includes:
an actuator that converts liquid power into an actuation force that moves a target moving body;
a fluid power source that supplies a working liquid to the actuator;
a pipe that connects the actuator and the fluid power generation source in a completely closed circuit;
has
At least one of the actuator and the fluid power generation source is a completely closed circuit type liquid power transmission device that discharges excess adjustment oil,
a regulator provided in a pipe on the low-pressure side of the fluid power generation source and absorbing a volume change of the working liquid;
a first recovery port provided in the downstream piping of the regulator with respect to the flow direction of the working liquid via a first flow control valve, and capable of recovering excess regulated oil from the actuator and/or the fluid power generation source; ,
a second recovery port provided in the upstream side piping of the regulator via a second flow control valve with respect to the flow direction of the working liquid, and capable of recovering excess regulated oil from the actuator and/or the fluid power generation source; ,
with
A valve releasing force of the first flow control valve is higher than a valve releasing force of the second flow control valve.

Since this fluid power transmission device has the above configuration, the following effects can be obtained.
A fluid power generation source supplies an actuation liquid to an actuator, and the actuator converts the liquid power into an actuation force to move a target moving body.
Since the piping that connects the actuator and the fluid power generation source is in the form of a completely closed circuit, the above-described effect of the closed circuit (the effect of eliminating the problems caused by the open circuit) can be obtained.
In the case where the piping connecting the actuator and the fluid power generation source forms a completely closed circuit, if a relatively inexpensive and general fluid power generation source is used without taking any measures, the fluid On the low-pressure side of the power source, pressure fluctuations occur due to changes in the volume of the working liquid, which can lead to destruction of the fluid power source due to cavitation erosion and seal failure.
In contrast, according to the present invention, since the piping on the low-pressure side of the fluid power generation source is provided with a regulator that absorbs the volume change of the working liquid, Pressure fluctuations due to volume changes of the liquid are suppressed.
Therefore, it is possible to prevent destruction of the fluid power generation source due to the cavitation erosion phenomenon and seal destruction, and as a result, in the completely closed circuit type liquid power transmission device, a relatively inexpensive and general fluid power generation source can be used. become able to.

In such a completely closed circuit type hydraulic power transmission device, there is a demand that at least one of the actuator and the fluid power generation source should be configured to discharge adjustment surplus oil.

In contrast, according to the present invention,
a first recovery port provided in the downstream piping of the regulator with respect to the flow direction of the working liquid via a first flow control valve, and capable of recovering excess regulated oil from the actuator and/or the fluid power generation source; ,
a second recovery port provided in the upstream side piping of the regulator via a second flow control valve with respect to the flow direction of the working liquid, and capable of recovering excess regulated oil from the actuator and/or the fluid power generation source; ,
with
Since the valve releasing force of the first flow control valve is higher than the valve releasing force of the second flow control valve, the following effects are obtained.
Regulated surplus oil from the actuator and/or fluid power source normally opens the valve of the second flow control valve and is collected through the second collection port into the upstream line of the regulator and flows to the regulator. Therefore, this hydraulic power transmission operates normally.
On the other hand, if the adjuster fails for some reason and the adjusted surplus oil from the actuator and/or the fluid power generation source is no longer collected in the upstream piping of the adjuster through the second recovery port, the adjusted surplus oil , the valve of the first flow control valve is released, and the gas is recovered in the upstream piping of the regulator through the first recovery port. This protects the circuitry that drains the conditioned surplus oil.

Further, in order to solve the above problems, the low-pressure side regulator of the fluid power generation source of the present invention includes:
an actuator that converts liquid power into an actuation force that moves a target moving body;
a fluid power source that supplies a working liquid to the actuator;
a pipe that connects the actuator and the fluid power generation source in a completely closed circuit;
A regulator provided in a pipe on the low-pressure side of the fluid power generation source in a completely closed circuit type fluid power transmission device having
A working liquid storage chamber, which is connected to the low-pressure side piping of the fluid power generation source, stores the working liquid and allows the working liquid to flow in and out, and which is not open to the outside air. Characterized by

Since the low pressure side regulator of this fluid power generation source has the above configuration, the following effects can be obtained.
In the case where the piping connecting the actuator and the fluid power generation source forms a completely closed circuit, if a relatively inexpensive and general fluid power generation source is used without taking any measures, the fluid On the low-pressure side of the power source, pressure fluctuations occur due to changes in the volume of the working liquid, which can lead to destruction of the fluid power source due to cavitation erosion and seal failure.
In contrast, the low-pressure side regulator of the fluid power generation source of the present invention is provided in the piping on the low-pressure side of the fluid power generation source and absorbs the volume change of the working liquid. It is possible to suppress the pressure fluctuation caused by the volume change of the working liquid in.
Therefore, it is possible to prevent destruction of the fluid power generation source due to the cavitation erosion phenomenon and seal destruction, and as a result, in the completely closed circuit type liquid power transmission device, a relatively inexpensive and general fluid power generation source can be used. become able to.
In the low-pressure side regulator of the fluid power generation source, the working liquid storage chamber in which the working liquid is stored and into which the working liquid flows is not open to the outside air. A perfect closed circuit state can be maintained.

In the low-pressure side regulator of this fluid power generation source,
The working liquid storage chamber is
a storage chamber case connected to a low-pressure side pipe of the fluid power generation source;
an elastic partition membrane hermetically stretched on the inner surface of the storage chamber case;
can be configured to have

With this configuration, the partition membrane facilitates the formation of the working liquid storage chamber that is not exposed to the outside air, and the elasticity of the partition membrane allows the volume change of the working liquid in the actuator to be absorbed satisfactorily. can be configured.

In the low-pressure side regulator of this fluid power generation source,
The working liquid storage chamber is
Consists of a sealed storage chamber case connected to the low-pressure side piping of the fluid power generation source and having a volume larger than the maximum amount of the working liquid to be stored,
The upper space in the storage chamber case may be filled with a gas that is difficult to dissolve in the working liquid.

With this configuration, the working liquid reservoir that is not exposed to the outside air can be easily formed by the sealed reservoir case without using a partition membrane, and contraction/expansion due to gas that is difficult to dissolve in the working liquid. Therefore, it is possible to satisfactorily absorb the change in the volume of the working liquid in the actuator.

In the low-pressure side regulator of this fluid power generation source,
The working liquid storage chamber is
a storage chamber case connected to a low-pressure side pipe of the fluid power generation source;
a temperature adjusting fluid introduction member provided on the outer surface side of the storage chamber case and for allowing the temperature adjusting fluid to flow between the storage chamber case and the outer surface side of the storage chamber case;
can be configured to have

With this configuration, the temperature of the working liquid stored and flowing in the working liquid storage chamber is adjusted by the temperature adjusting fluid that is introduced by the temperature adjusting fluid introduction member and flows between the outer surface side of the storage chamber case and the temperature adjusting fluid. can do.
As a result, it is possible to efficiently suppress the volume fluctuation caused by the density change due to the temperature change of the working liquid.
Therefore, it is possible to more reliably prevent destruction of the fluid power generation source due to cavitation erosion phenomenon and seal destruction. You will be able to use the source stably.

In the low-pressure side regulator of this fluid power generation source,
The working liquid storage chamber is
a storage chamber case connected to a low-pressure side pipe of the fluid power generation source;
a temperature adjusting fluid introduction member provided on the outer surface side of the storage chamber case and for allowing the temperature adjusting fluid to flow between the storage chamber case and the outer surface side of the storage chamber case;
has
The temperature adjusting fluid introducer has a case shape covering the outer surface side of the storage chamber case,
At least one of the inner surface and the outer surface of the storage chamber case can be configured to have an uneven surface having a large number of uneven surfaces.

With this configuration, the introduction path for the temperature adjusting fluid can be easily formed by the case-shaped temperature adjusting fluid introduction member covering the outer surface side of the storage chamber case, and the inner surface of the storage chamber case, The uneven surface having a large number of uneven surfaces provided on at least one of the outer surfaces improves the heat exchange efficiency and enables more efficient temperature control of the working liquid.

1 is a configuration diagram showing an embodiment of a fluid power transmission device and a low-pressure side regulator of a fluid power generation source according to the present invention; FIG. The block diagram which similarly shows another embodiment. (a), (b), and (c) are diagrams showing examples of actuators, respectively. 4(a), 4(b) and 4(c) are diagrams showing examples of a low-pressure side regulator of a fluid power generation source, respectively; FIG. (a) is a cross-sectional view showing another example of the low-pressure side regulator of the fluid power generation source, and (b) is a partially enlarged view of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a fluid power transmission device and a low-pressure side regulator of a fluid power generation source according to the present invention will be described with reference to the drawings. In each figure, the same reference numerals are given to the same or corresponding parts.

As shown in FIG. 1, the fluid power transmission device 1 of this embodiment includes:
an actuator 10 that converts the liquid power into an actuation force that moves the target moving body 2;
a fluid power generation source 20 that supplies the working liquid 3 to the actuator 10;
a pipe 30 that connects the actuator 10 and the fluid power generation source 20 in a completely closed circuit;
have.
A regulator (low-pressure side regulator of the fluid power generation source) 50 that absorbs the volume change of the working liquid 3 is provided in the pipe 31 on the low pressure side of the fluid power generation source 20 .

Since the fluid power transmission device 1 is configured as described above, the device provides the following effects.

The fluid power generation source 20 supplies the working liquid 3 to the actuator 10 , and the liquid power is converted into working force by the actuator 10 to move the target moving body 2 .
Since the pipe 30 that connects the actuator 10 and the fluid power generation source 20 is in the form of a completely closed circuit, the effect of the closed circuit (the effect of eliminating the problems caused by the open circuit) can be obtained.

In the case where the pipe 30 connecting the actuator 10 and the fluid power generation source 20 is in the form of a completely closed circuit, a relatively inexpensive and general fluid power generation source 20 is used without taking any measures. Then, on the low-pressure side (suction side) of the fluid power generation source 20, pressure fluctuations occur due to the volume change of the working liquid 3, which causes the fluid power generation source 20 to break due to the cavitation erosion phenomenon and the seal breakage. may occur.

In contrast, according to this embodiment, the pipe 31 on the low pressure side (suction side) of the fluid power generation source 20 is provided with the regulator 50 for absorbing the volume change of the working liquid 3. Pressure fluctuations due to changes in the volume of the working liquid 3 on the low pressure side (suction side) of the fluid power generation source 20 are suppressed.

Therefore, it is possible to prevent the destruction of the fluid power generation source 20 due to the cavitation erosion phenomenon and the seal destruction. can be used.

In FIG. 1, reference numeral 41 denotes a direction switching device for switching the direction of action of the liquid power, and 42 denotes a relief valve for suppressing an increase in pressure in the circuit of the liquid power to a constant value.

In such a completely closed-circuit type hydraulic power transmission device 1, there is a demand that at least one of the actuator 10 and the fluid power generation source 20 should be configured to discharge the adjustment surplus oil DR.

Therefore, for example, as shown in FIG. 2, the fluid power transmission device 1 of this embodiment has
If at least one of the actuator 10 and the fluid power generation source 20 is a circuit configuration device that discharges adjustment surplus oil,
With respect to the flow direction of the working liquid 3, the regulator 50 is provided in the downstream piping 31 via the first flow control valve 61, and can recover the regulated surplus oil DR from the actuator 10 and/or the fluid power generation source 20. a first recovery port 61p;
With respect to the flow direction of the working liquid 3, the regulator 50 is provided in the upstream piping 32 via the second flow control valve 62, and can recover the regulated surplus oil DR from the actuator 10 and/or the fluid power generation source 20. a second recovery port 62p;
with
The valve releasing force of the first flow control valve 61 may be higher than the valve releasing force of the second flow control valve 62 . In other words, for example, the urging force of the first flow control valve 61 against the valve seat may be smaller than that of the second flow control valve 62 . That is, the second flow control valve 62 can be configured to allow the adjusted surplus oil DR to flow more easily than the first flow control valve 61 .

In the fluid power transmission device 1 shown in FIG. 2, the actuator 10, the fluid power generation source 20, the direction switching device 41, and the relief valve 42 are all circuit components configured to discharge the adjusted surplus oil DR. At least one of the circuit constituent devices of the completely closed circuit type liquid power transmission device is a circuit constituent device configured to discharge the adjusted surplus oil DR (hereinafter also referred to as "adjusted surplus oil discharging device"). In the case of the above circuit configuration, i.e.
Regarding the flow direction of the working liquid 3, a first recovery port 61p is provided in the downstream side pipe 31 of the regulator 50 via the first flow control valve 61, and is capable of recovering the regulated surplus oil DR from the regulated surplus oil discharge device. and,
Regarding the flow direction of the working liquid 3, a second recovery port 62p is provided in the upstream side pipe 32 of the regulator 50 via a second flow control valve 62, and is capable of recovering the adjusted surplus oil DR from the adjusted surplus oil discharge device. and,
with
A configuration in which the valve releasing force of the first flow control valve 61 is higher than the valve releasing force of the second flow control valve 62 is effective.

With this configuration, the following effects can be obtained.
Adjusted surplus oil DR from the adjusted surplus oil discharge device (actuator 10, etc., hereinafter the same) is normally recovered to the upstream side pipe of the regulator 50 through the second recovery port 62p by releasing the valve of the second flow control valve 62. and flows to regulator 50 . Therefore, this hydraulic power transmission device 1 operates normally.
On the other hand, if the adjuster 50 malfunctions for some reason and the adjusted surplus oil DR from the adjusted surplus oil discharging device is no longer collected in the upstream pipe 32 of the adjuster 50 through the second recovery port 62p, then the adjusted surplus The oil DR releases the valve of the first flow control valve 61 and is recovered in the upstream pipe 31 of the regulator 50 through the first recovery port 61p. This protects the circuit components that discharge the adjusted surplus oil DR.

As shown in FIG. 1 and the like, the low-pressure side regulator 50 of the fluid power generation source 20 of this embodiment is
For example, a regulator provided in the pipe 31 on the low-pressure side of the fluid power generation source 20 in the above-described completely closed circuit type fluid power transmission device to absorb the volume change of the working fluid 3,
It is connected to a pipe 31 on the low pressure side (suction side) of the fluid power generation source 20, stores the working liquid 3 (the stored working liquid is indicated by reference numeral 3a), and allows the working liquid 3 to flow in and out. , has a working liquid reservoir 51 that is not open to the atmosphere.

Since the low-pressure side regulator 50 of the fluid power generation source 20 has the structure described above, the same effects can be obtained as described above.
In the low-pressure side regulator 50 of the fluid power generation source 20, the working liquid 3 is stored (the stored working liquid is indicated by reference numeral 3a), and the working liquid 3 flows in and out. Since the storage chamber 51 is not open to the outside air, the liquid power transmission device 1 can maintain a completely closed circuit state.

The working liquid storage chamber 51 of this embodiment is
a storage chamber case 52 connected to the low pressure side pipe 31 of the fluid power generation source 20;
an elastic partition membrane 53 hermetically stretched on the inner surface of the storage chamber case 52;
have.

With this configuration, the working liquid storage chamber 51 that is not exposed to the outside air can be easily formed by the partition membrane 53, and the elasticity of the partition membrane 53 allows the working liquid 3 on the low pressure side of the fluid power generation source 20 to be stored. It is possible to configure the structure so as to favorably absorb the volume change of the .

For example, as shown in FIG. 4A, the working liquid storage chamber 51 in the low-pressure side regulator 50 of the fluid power generation source 20 is
It is connected to the low-pressure side pipe 31 of the fluid power generation source 20 and is composed of a sealed storage chamber case 52 having a volume larger than the maximum amount of the stored working liquid 3a,
The upper space S1 in the storage chamber case 52 may be filled with a gas G1 that is difficult to dissolve in the working liquid 3 (3a).

With this configuration, the working liquid storage chamber 51 that is not exposed to the outside air can be easily formed by the closed storage chamber case 52 without using the partition membrane 53, and a gas that is difficult to dissolve in the working liquid 3 can be easily formed. The contraction/expansion due to G1 makes it possible to satisfactorily absorb the volume change of the working liquid 3 on the low pressure side of the fluid power generation source 20 .

As shown in FIG. 1 and the like, the working liquid storage chamber 51 in the low-pressure side regulator 50 of the fluid power generation source 20 of this embodiment is
a storage chamber case 52 connected to the low pressure side pipe 31 of the fluid power generation source 20;
a temperature adjusting fluid introduction body 54 which is provided on the outer surface side of the storage chamber case 52 and which flows the temperature adjusting fluid 4 between itself and the outer surface side of the storage chamber case 52;
have.

With this configuration, the operating liquid 3 (3a) stored and flowing in the operating liquid storage chamber 51 is introduced by the temperature adjusting fluid introduction member 54 and flows between the outer surface side of the storage chamber case 52 and the temperature S2. The temperature can be regulated by the conditioning fluid 4 .

As a result, it is possible to suppress the density change due to the temperature change of the working liquid 3 on the low pressure side of the fluid power generation source 20 and the pressure fluctuation caused thereby.

Therefore, it is possible to more reliably prevent the destruction of the fluid power generation source 20 due to the cavitation erosion phenomenon and the seal destruction. The generation source 20 can be stably used.

For example, as shown in FIG. 5, the working liquid storage chamber 51 in the low-pressure side regulator 50 of the fluid power generation source 20 is
a storage chamber case 52 connected to the low pressure side pipe 31 of the fluid power generation source 20;
a temperature adjusting fluid introduction body 54 which is provided on the outer surface side of the storage chamber case 52 and which flows the temperature adjusting fluid 4 between itself and the outer surface side of the storage chamber case 52;
has
The temperature adjusting fluid introduction body 54 has a case shape covering the outer surface side of the storage chamber case 52,
At least one of the inner surface and the outer surface of the storage chamber case 52 (both in the illustrated case) may be configured to have an uneven surface 55 having a large number of uneven surfaces.

With this configuration, the introduction path 4p for the temperature-adjusting fluid 4 can be easily formed by the case-shaped temperature-adjusting fluid introduction body 54 that covers the outer surface of the storage-chamber case 52, The uneven surface 55 having a large number of uneven surfaces provided on at least one of the inner surface and the outer surface of the case 52 increases the heat exchange area and turbulates the flow of the working liquid 3 and/or the temperature adjusting fluid 4 ( A schematic example of a turbulent flow state of the working liquid 3 is indicated by reference numeral 3b, and a schematic example of a turbulent flow state of the temperature adjusting fluid 4 is indicated by reference numeral 4b. more efficient temperature control is possible.

Further details are given below.
Liquid power means power using a liquid, and known liquids such as oil, water, seawater, and chemical solutions (eg, radiator liquid) can be used as the liquid.
Therefore, as the working liquid 3, known liquids such as oil, water, seawater, and chemical solutions can be used.

The target moving body 2 is a variety of known targets to be moved by the actuator 10 and has a wide variety. For example, an excavator in an excavator can be mentioned.

The actuator 10 is for moving the target moving body 2, and includes a single-rod cylinder (Fig. 1), a double-rod direct-acting cylinder (Fig. 3(a)), a rotary motor (Figs. 2 and 3(b)), a swing A motor (FIG. 3(c)) and the like can be mentioned.

In the case of a single-rod cylinder (Fig. 1), since the rod 10r exists only on one side of the cylinder, the amount of the working liquid 3 flowing in (or outflowing) to the rod 10r side and the amount of the working liquid 3 flowing out (or inflowing) to the side without the rod There is a rod volume difference between the amount of working liquid 3 and the amount of working liquid 3 that flows, and this difference is a major cause of pressure fluctuations on the suction side of the fluid power source 20 .
This embodiment is particularly effective when using a single-rod cylinder as the actuator 10 in a closed circuit because even such large linear fluctuations can be absorbed by the regulator 50 .

The fluid power generation source 20 is for supplying the working liquid 3 to the actuator 10, and a known and inexpensive general pump (eg, gear pump, piston pump, vane pump, trochoid pump, etc.) can be adopted. .
A specific example of a general pump is A70-FR01BS-60 manufactured by Yuken Kogyo (reference price: about 150,000 yen).
On the other hand, a conventional closed circuit type pump having substantially the same performance as the above pump is expensive.
The present invention makes it possible to use a common pump that is well known and inexpensive.

The piping 30 can be made of a known appropriate piping material.
A direction switching device 41 for switching the direction of action of the liquid power and a relief valve 42 for suppressing an increase in the pressure in the circuit of the liquid power to a constant value can each adopt a known appropriate one.
A publicly known device such as an actuator configured to discharge the adjustment surplus oil DR can also be used.

The first flow control valve 61 and the second flow control valve 62 themselves may employ known ones. For example, in the embodiment shown in FIG. , and the second flow control valve 62 is configured to open at 0 to 0.5 MPa.
In the embodiment shown in FIG. 2, an external release port 64 may be provided through a relief valve 63 . With this configuration, in the unlikely event that the pressure fluctuation exceeds the adjustment capability of the regulator 50 , the working liquid 3 can be released to the outside through the relief valve 63 .

The storage chamber case 52 that constitutes the working liquid storage chamber 51 can be made of an appropriate known material (for example, a metal such as iron, stainless steel, or aluminum).
The partition wall film 53 having elasticity can be composed of, for example, a moving wall using metal or resin, a bellows, a shrinkable resin film, or the like. The partition membrane 53 and the inner surface of the storage chamber case 52 are joined together by inserting a sealing material (for example, an O-ring), so that the working liquid storage chamber 51 can be hermetically sealed.

If the working liquid 3 is oil and the actuator 10 is a hydraulic cylinder, the capacity required for adjusting the working liquid 3 by the regulator 50 (adjustment-required capacity) should be twice the capacity of the cylinder. A specific example is as follows.
Cylinder capacity of inner diameter φ63 x stroke 300mm is about 0.94L
The required adjustment capacity should be 0.94×2 ≒ 2L.

On the other hand, in the case of a conventional general open-circuit type liquid power transmission device (for example, a hydraulic device), an oil reservoir (tank) is required.
Since the oil tank (tank) capacity is required to be 3 to 5 times the pump flow rate (per minute), in the above example,
The required flow rate is 56.1 L/min when moving a cylinder with an inner diameter of 63 mm and a stroke of 300 mm in 1 second.
Approximately 56.1 × 3 = 168 L for a variable pump and 56.1 × 5 = 280 L for a fixed displacement pump.

Therefore, by using the regulator 50 of the present embodiment, in the above example, the required amount of oil is reduced from 1/84 to 1/140 compared to the conventional general open circuit type hydraulic power transmission device. It becomes possible to Therefore, an oil tank (tank) becomes unnecessary, and the size of the entire liquid power transmission device can be reduced.

For example, as shown in FIG. 4A, when the upper space S1 in the storage chamber case 52 is filled with a gas G1 that is difficult to dissolve in the working liquid 3 (3a), the gas G1 may be nitrogen, air, or the like. to adopt.
In FIG. 4(a), 56 is a gas filling valve, which shuts off the upper space S1 from the outside air.
When the partition film 53 is used as shown in FIG. 1 and the like, the upper space S3 can be opened to the atmosphere. In FIG. 1 etc., S4 is an opening.

The temperature adjusting fluid introducer 54 can be made of a known appropriate material (for example, a metal such as iron, stainless steel, or aluminum).
As the temperature adjusting fluid 4, gas (including air), water, seawater, oil, chemical liquid, radiator liquid, or the like can be used.

For example, as shown in FIG. 4B, the temperature adjusting fluid 4 can be circulated and supplied to the introduction space S2 described above by a circulation pump 43 and a pipe 44. As shown in FIG.
Further, when the temperature adjusting fluid 4 is gas (including air), as shown in FIG. A channel 47 may supply the aforementioned introduction space S2.

Excess power energy may be added to the working liquid 3 as heat.
When the working liquid 3 is heated, its density changes and its volume also changes.
In a completely closed-circuit fluid power transmission 1, an increase in the density of the working liquid 3 leads to an increase in pressure, which can lead to failure of equipment that cannot withstand it.
On the other hand, according to this embodiment, by adjusting the temperature of the working liquid 3 with the temperature adjusting fluid 4 as described above, together with the pressure adjustment by the regulator 50, the working liquid can be 3 pressure increase can be suppressed.

In FIG. 5, reference numeral 57 denotes a cylindrical body made of a porous wall (for example, punching metal, etc.) provided in the storage chamber case 52, which makes the flow of the working liquid 3 turbulent (a schematic diagram of a turbulent state). 3b) can be facilitated.
Reference numeral 58 denotes an inflow/outlet port for the working liquid 3 connected to the low-pressure side pipe 31 of the fluid power generation source 20, and 59 denotes a secondary connection port for the working liquid 3. FIG.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist of the present invention.

1: fluid power transmission device 2: target moving body 3: working liquid 4: temperature adjusting fluid 10: actuator 20: fluid power generation source 30: piping 50: regulator (low-pressure side regulator of fluid power generation source)
51: Actuating liquid storage chamber 52: Storage chamber case 53: Partition membrane 54: Temperature adjusting fluid introduction member 61: First flow control valve 61p: First recovery port 62: Second flow control valve 62p: Second recovery mouth

Claims (5)

an actuator (10) that converts liquid power into an actuation force that moves a target moving body (2);
a fluid power source (20) supplying a working liquid (3) to the actuator (10);
a pipe (30) connecting the actuator (10) and the fluid power generation source (20) in a completely closed circuit;
has
At least one of the actuator (10) and the fluid power generation source (20) is a completely closed circuit type hydraulic power transmission device, wherein at least one of the fluid power generation source (20) is a circuit component device for discharging adjustment excess oil (DR),
a regulator (50) provided in a pipe (31) on the low pressure side of the fluid power generation source (20) and absorbing a volume change of the working liquid (3);
With respect to the flow direction of the working liquid (3), the actuator (10) and/or fluid power generation is provided in the downstream pipe (31) of the regulator (50) via a first flow control valve (61). a first recovery port (61p) capable of recovering regulated surplus oil (DR) from the source (20);
With respect to the flow direction of the working liquid (3), the actuator (10) and/or fluid power generation is provided in the upstream pipe (32) of the regulator (50) via a second flow control valve (62). a second recovery port (62p) capable of recovering conditioned excess oil (DR) from the source (20);
with
A fluid power transmission device, wherein the valve releasing force of the first flow control valve (61) is higher than the valve releasing force of the second flow control valve (62). an actuator (10) that converts liquid power into an actuation force that moves a target moving body (2);
a fluid power source (20) supplying a working liquid (3) to the actuator (10);
a pipe (30) connecting the actuator (10) and the fluid power generation source (20) in a completely closed circuit;
The adjuster (50 ) and
Connected to the low-pressure side pipe (31) of the fluid power generation source (20), the working liquid (3) is stored and the working liquid (3) flows in and out, and is not open to the outside air having an actuating liquid reservoir (51) ,
The working liquid storage chamber (51) is
a storage chamber case (52) connected to the low pressure side pipe (31) of the fluid power generation source (20);
a temperature adjusting fluid introduction member (54) provided on the outer surface side of the storage chamber case (52) for allowing the temperature adjusting fluid (4) to flow between itself and the outer surface side of the storage chamber case (52);
A low-pressure side regulator for a fluid power generation source, characterized by comprising : In claim 2 ,
The working liquid storage chamber (51) is
a storage chamber case (52) connected to the low pressure side pipe (31) of the fluid power generation source (20);
an elastic partition membrane (53) hermetically stretched on the inner surface of the storage chamber case (52);
A low-pressure side regulator for a fluid power generation source, characterized by comprising: In claim 2 ,
The working liquid storage chamber (51) is
It is connected to the low-pressure side pipe (31) of the fluid power generation source (20) and consists of a sealed storage chamber case (52) having a volume larger than the maximum amount of the working liquid (3) to be stored. is,
A low-pressure side regulator for a fluid power generation source, characterized in that the upper space (S1) in the storage chamber case (52) is filled with a gas (G1) that is difficult to dissolve in the working liquid (3). . In any one of claims 2 to 4 ,
The temperature adjusting fluid introducer (54) has a case shape covering the outer surface side of the storage chamber case (52),
A low-pressure side regulator for a fluid power generation source, wherein at least one of the inner surface and the outer surface of a storage chamber case (52) has an uneven surface (55) having a large number of uneven surfaces.

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