JP2515961Y2 - hydraulic unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hydraulic unit equipped with an electric motor for driving a hydraulic pump and a solenoid valve for controlling the flow of oil, which can be remotely operated by an operation switch.

[Conventional technology]

Conventionally, a hydraulic unit of this type has an electric motor 4 for driving a hydraulic pump 3 arranged inside a tank 1 on an upper plate 2 of a tank 1 for storing oil therein, as shown in FIG. 3 and FIG.
And the pilot-operated check valves 6A and 6B and two electromagnets 7A, 7B and 8A and 8B on the manifold 5 mounted and fixed on the upper plate 2 to control the switching of the oil flow direction. Solenoid valves 7 and 8 are stacked, and two hydraulic actuators (not shown) that are connected to the manifold member 5 by pipes corresponding to the solenoid valves 7 and 8 are operated and controlled, and the electric motor 4 on the upper plate 2 and the manifold 5 are controlled. , Pilot operated check valve
An outer cover 9 is attached to the tank 1 so as to cover the 6A and 6B and the solenoid valves 7 and 8, and a front opening of the outer cover 9 is closed by a lid member 10.
Is stuck. As shown in FIG. 5, this hydraulic unit is provided so that the electric motor 4 and the solenoid valves 7 and 8 can be remotely operated by the operation switches 13 and 14 which are specially arranged apart from the tank 1. Current is electrical wiring
The electric switch 16 flows from the electric wire 15 to the operation switch 13, and the electric switch 16B flows from the electric wire 15 to the operation switch 1
Up to 4. Then, for example, the operation switch 13 closes the space between the electric wire 16A and the electric wire 17 electrically connected to one electromagnet 7A of the solenoid valve 7, and electrically connects the electric wire 16A and the electromagnetic switch 22 via the electric wire 23. Electric wiring 24A
When the space between is closed, the current flowing from the DC power supply 21 through the electric wiring 16A flows through the electric wiring 17 and the one electromagnet 7A of the solenoid valve 7 is closed.
And the electric current flowing through the electric wiring 16A flows through the electric wirings 24A and 23 to energize the electromagnetic switch 22. The electromagnetic switch 22 is closed when energized, and the current from the DC power supply 21 flows through the electromagnetic switch 22 that is closed to energize the electric motor 4. When the operation switch 13 closes the electric wire 16A and the electric wire 18 electrically connected to the other electromagnet 7B of the solenoid valve 7, and when the electric wire 16A and the electric wire 24A are closed, The other electromagnet 7B is energized and the electric motor 4 is energized. Similarly, the operation switch 14 closes the gap between the electric wiring 16B and the electric wiring 19 electrically connected to one electromagnet 8A of the solenoid valve 8, and at the same time, the electric wiring 16B and the electric wiring 2
When the space between 4B and 4B is closed, one electromagnet 8A of the solenoid valve 8 is energized and the electric motor 4 is energized. Also, the operation switch
The electrical wiring 16B and the electrical wiring 20 electrically connected to the other electromagnet 8B of the solenoid valve 8 are closed by 14 and the electrical wiring is
When the space between 16B and the electrical wiring 24B is closed, the other electromagnet 8B of the solenoid valve 8 is energized and the electric motor 4 is energized.

[Problems to be solved by the invention]

However, the operation switches 13 and 14 have first contacts 13A and 14A for opening and closing between the electric wirings 16A and 16B and the electric wirings 17 and 19, and
The second contacts 13B and 14B for opening and closing between the electric wirings 16A and 16B and the electric wirings 18 and 20, and between the electric wirings 16A and 16B and the electric wirings 24A and 24B are interlocked with the first contact points 13A and 14A. Electrical wiring 16 that interlocks with the third contacts 13C and 14C that open and close, and the second contacts 13B and 14B
Fourth contact 13 for opening and closing between A and 16B and electrical wiring 24A and 24B
Since it has to have D and 14D, the operation switches 13 and 14 have a complicated structure with four contact points, which is large and heavy, which makes the handling difficult and increases the manufacturing cost of the entire hydraulic unit. There was a problem that invited me.

The present invention solves such a problem, and provides a hydraulic unit that can be manufactured at a low cost by using a small and lightweight operation switch.

[Means for solving problems]

For this reason, the present invention provides a solenoid valve having an electric motor for driving a hydraulic pump for sucking and discharging oil and two electromagnets on an upper plate of a tank provided for storing oil and for controlling an oil flow. And the operation switch for remotely operating the electric motor and the solenoid valve is arranged separately from the tank, and the operation switch is the first contact and solenoid valve for opening and closing between one electromagnet of the solenoid valve and the DC power supply side. Has a second contact that opens and closes between the other electromagnet and the DC power supply side, and electrically connects the electric motor and the DC power supply side through an electromagnetic switch that opens and closes the contact by energizing and de-energizing, and The electromagnetic switch and each electromagnet of the solenoid valve are electrically connected through a rectifier so that the electromagnetic switch opens and closes when the solenoid valve is energized and deenergized by operation.Each rectifier energizes the solenoid valve. Allow current to flow from each electromagnet side of the solenoid valve to the solenoid switch side so that the current flowing from the electromagnet side to the solenoid switch side does not flow to the non-energized electromagnet side.Current from the solenoid switch side to each electromagnet side of the solenoid valve It is arranged so that the flow of can be blocked.

[Action]

In such a configuration, when the second contact of the operation switch is opened and the first contact is closed, the current from the DC power supply side flows through the closed first contact to energize one electromagnet of the solenoid valve and energize the electromagnetic switch. Then the electromagnetic switch closes,
The current from the DC power supply side flows through the electromagnetic switch that is closed to energize the motor. At this time, the current flowing from the one electromagnet side energized by the rectifier interposed between the electromagnetic switch and the other non-energized electromagnet to the electromagnetic switch side is prevented from flowing to the other non-energized electromagnet side. When the first contact of the operation switch is opened and the second contact is closed, the current from the DC power source flows through the closed second contact to energize the other electromagnet of the solenoid valve and energize the electromagnetic switch. The electromagnetic switch is closed, and the current from the DC power source flows through the closed electromagnetic switch to energize the motor. At this time,
A current flowing from the other electromagnet side energized by the rectifier interposed between the electromagnetic switch and the one non-energized electromagnet to the electromagnetic switch side is prevented from flowing to one non-energized electromagnet side. Therefore, the operation switch has a first contact opening and closing between one electromagnet of the solenoid valve and the DC power supply side and a second contact opening and closing between the other electromagnet of the solenoid valve and the DC power supply side. The cost of manufacturing the entire hydraulic unit can be kept low by using a small and lightweight operation switch.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 25 is a tank for storing oil therein, which is formed in a rectangular parallelepiped shape. 26 is a hydraulic pump, which is installed inside the tank 25 and is driven by the tank 25.
The stored oil is sucked and discharged inside. 27 is a spacer member, which is mounted and fixed on the upper plate 25A, and the tank 2
5. The hydraulic pump 26 arranged inside is fixed to the lower surface. 28
Is an electric motor for driving the hydraulic pump 26, which is erected on the upper surface of the spacer member 27 fixedly mounted on the upper plate 25A.
Internally connected to the hydraulic pump 26. 29 is a relief valve, which is retracted inside the spacer member 27 and the head is a spacer member.
The discharge pressure of the oil discharged from the hydraulic pump 26 is set so as to project from the hydraulic pump 26. Reference numeral 30 denotes a manifold member, which is connected to the spacer member 27 and fixedly mounted on the upper plate 25A. The pilot operated check valves 31A and 31B are provided on the upper surface.
And solenoid valves 32 and 33 having two electromagnets 32A, 32B and 33A, 33B for switching control of the oil flow direction are arranged in layers. The hydraulic pump 26, the relief valve 29, the pilot-operated check valves 31A and 31B, and the solenoid valves 32 and 33 are connected to each other through internal passages (not shown) of the spacer member 27 and the manifold member 30, and are connected to each other as shown in FIG. A hydraulic circuit similar to that of the conventional example shown in FIG. The reference numeral 34 designates an exterior cover, which crosses over the side plates of the tank 25 in three directions over the upper plate 25A, the electric motor 28, the solenoid valves 32, 33.
The spacer member 27, the electric motor 28, the manifold member 30, the pilot-operated check valves 31A, 31B, and the solenoid valve, which are formed by extending from the uppermost part of the above to the upper plate 25A.
It covers 32 and 33 from three directions. The exterior cover 34 has openings formed in the front and upper portions. Reference numeral 35 denotes a lid member, which is detachably provided so as to close the front opening and the upper opening of the exterior cover 34. Then, the outer cover 34 and the lid member 25 are used to form a spacer member 27, an electric motor 28, a manifold member 30, pilot operation check valves 31A and 31B, a solenoid valve 32,
It is designed to protect the 33 from outside dust. Reference numeral 34A is a mounting portion of the outer cover 34. 36 is a first operation switch for remotely operating the electric motor 28 and the solenoid valve 32.
Placed separately from 25, DC voltage source 48 and electrical wiring 48
The solenoid valve 32 is electrically connected via A, 37, 38A, and is electrically connected to one electromagnet 32A of the solenoid valve 32 via electrical wiring 39, 40.
The other electromagnet 32B is electrically connected to the other electromagnet 32B via electrical wirings 41 and 42. Reference numeral 43 is a second operation switch for remotely operating the electric motor 28 and the solenoid valve 33, which is specially arranged apart from the tank 25 and electrically connected to the DC voltage source 48 through the electric wiring 48A, 37, 38B, and the solenoid valve. 38 one electromagnet 33A and electrical wiring 4
Electrically connected via 4, 45, the other electromagnet 33B of the solenoid valve 33
And electrical connection via electrical wirings 46 and 47. The operation switch 36 includes a first manually operated contact 36A that opens and closes between the electrical wiring 38A and the electrical wiring 40 and the electrical wiring 3
Manually operated second contact 36 for opening and closing between 8A and electrical wiring 42
Have B. Also, the operation switch 43 has an electric wiring 38B.
Manually operated first contact 43A that opens and closes between the wiring and the electrical wiring 45
Further, it has a manually operated second contact 43B for opening and closing between the electric wiring 38B and the electric wiring 47. 37A is a fuse arranged in the electric wiring 37, 49 is an electromagnetic switch that opens and closes the contact by energizing and de-energizing, and is attached to the inner wall surface of the outer cover 34,
It is provided so as to be interposed between the DC power source 48 and the electric motor 28 that are electrically connected. The electromagnetic switch 49 has an electric wiring 39 via an electric wiring 50 branched from an electric wiring 49A included in the electromagnetic switch 49 so as to be opened and closed by energizing and de-energizing each electromagnet 32A, 32B of the solenoid valve 32 by operating the operation switch 36. , 40 and are electrically connected to the electric wirings 41 and 42 through the electric wiring 51. Then, in the electric wiring 50, 51, from the electromagnets 32A, 32B side of the solenoid valve 32, the electromagnetic switch
Rectifiers 52A and 52B that allow the flow of current to the 49 side and block the flow of current from the electromagnetic switch 49 side to the electromagnets 32A and 32B sides of the solenoid valve 32 are installed, and the electromagnet 32A or 32B that energizes is provided.
Side of the electromagnetic switch 49 side is a non-energized electromagnet
It does not flow to the 32B or 32A side. Further, the electromagnetic switch 49 is electrically connected via an electric wire 53 branched from an electric wire 49A included in the electromagnetic switch 49 so as to be opened / closed by energizing / de-energizing each electromagnet 33A, 33B of the solenoid valve 33 by operating the operation switch 43. It is electrically connected to the wirings 44 and 45, and is also electrically connected to the electrical wirings 46 and 47 through the electrical wiring 54. Then, the electric wires 53, 54 allow the flow of current from the electromagnets 33A, 33B side of the solenoid valve 33 to the electromagnetic switch 49 side, respectively, and from the electromagnetic switch 49 side to the electromagnets 33A, 33B side of the solenoid valve 33, respectively. Rectifier 52C, 5 to block current flow
2D is provided so that the current flowing from the energized electromagnet 33A or 33B side to the electromagnetic switch 49 side does not flow to the non-energized electromagnet 33B or 33A side. 55 is the exterior cover 34
The rectifier storage box installed on the inner wall of the
It contains A, 52B, 52C, 52D. Reference numeral 56 denotes two insertion holes penetratingly formed in the exterior cover 34 so that the respective electric wirings electrically connected to the operation switches 36 and 43 are inserted.

 Next, the operation of this configuration will be described.

Now, from the state shown in FIG. 2, the first contact 36 of the operation switch 36
When A is closed by manual operation, the current from the DC power source 48 is electric wiring 48A, fuse 37A, electric wiring 37, 38A 1st contact 36
A, one of the electromagnets 32A of the solenoid valve 32 flowing through the electric wiring 40, 39
Energizing, electrical wiring 50, rectifier 52A, electrical wiring 4
9A to energize the electromagnetic switch 49 to close the electromagnetic switch 49, and a current from the DC power source 48 flows through the electric wiring 48A and the electromagnetic switch 49 to energize the electric motor 28. At this time, the current flowing through the electric wiring 50, 49A is changed by the rectifiers 52B, 52C, 52D to the other electromagnet 32B of the solenoid valve 32 and each electromagnet 3 of the solenoid valve 33.
It is blocked from flowing to 3A and 33B. The electric motor 28 drives the hydraulic pump 26 by energization, the hydraulic pump 26 sucks and discharges the oil stored in the tank 25, and the oil discharged from the hydraulic pump 26 is actuated to one side by energizing one electromagnet 32A.
By this, the flow direction of the oil is switched and controlled. From this state,
When the first contact 36A of the operation switch 36 is opened, the electromagnet 32B of the solenoid valve 32 is de-energized to return to the neutral position and the motor 28
De-energizes and stops. When the second contact 36B of the operation switch 36 is manually closed from the state shown in FIG. 2, a current is supplied from the DC power source 48 to the electric wiring 48A, the fuse 37A,
While flowing through the electric wiring 37, 38A, the second contact 36B, the electric wiring 42, 41 to energize the other electromagnet 32B of the solenoid valve 32, it also flows through the electric wiring 51, the rectifier 52B, the electric wiring 49A and the electromagnetic switch.
The electromagnetic switch 49 is closed by energizing 49, and the current from the DC power source 48 flows through the electric wiring 48A and the electromagnetic switch 49, and the motor 2
Energize 8. At this time, the current flowing through the electric wiring 51, 49A is changed by the rectifiers 52A, 52C, 52D to the solenoid valve 3 of the solenoid valve 32.
2A and the electromagnets 33A and 33B of the solenoid valve 33 are prevented from flowing. The electric motor 28 drives the hydraulic pump 26 by energization, and the oil discharged from the hydraulic pump 26 is switched and controlled in the direction of oil flow by the solenoid valve 32 which operates to the other side by energizing the other electromagnet 32B. The second contact of the operation switch 36
When 36B is opened, the solenoid valve 32 returns to neutral and the electric motor 28 stops.

Next, from the state of FIG. 2, the first contact 43 of the operation switch 43
When A is closed, one of the electromagnets 33A of the solenoid valve 33 is energized and the electric motor 28 is energized, and the oil discharged from the hydraulic pump is switched to one side by the solenoid valve 33, and the flow direction of the oil is controlled to be switched. When the first contact 43A of 43 is opened, the solenoid valve 33
Returns to neutral and the electric motor 28 stops. Further, when the second contact 43B of the operation switch 43 is closed from the state of FIG. 2, the other electromagnet 33B of the solenoid valve 33 and the electric motor 28 are energized, and when the second contact 43B of the operation switch 43 is opened, the solenoid valve 33 is opened. Returns to neutral and the electric motor 28 stops.

By such operation, the electromagnets 32A, 32B, 33 of the solenoid valves 32, 33 are
The electromagnetic switch 49 is opened / closed by energizing / de-energizing the A / 33B, and the current flowing from the energized electromagnet 32A or 32B or 33A or 33B side to the electromagnetic switch 49 side is the non-energized electromagnet 32B or 33A. Or rectifier 52B, 52C, 52D or 52 to flow to 33B or 32A side
Since it is blocked by A, the operation switches 36 and 43 are the first
It may have contacts 36A, 43A and second contacts 36B, 43B,
By using the small and lightweight operation switches 36 and 43, the manufacturing cost of the entire hydraulic unit can be kept low. In addition, the operation switches 36 and 43 are electrically connected to the DC power source 48.
38A, 38B, electrical wiring 40, 45 electrically connected to one electromagnet 32A, 33A of the solenoid valve 32, 33, and electrical wiring 42, 47 electrically connected to the other electromagnet 32B, 33B of the solenoid valve 32, 33. Since it is not necessary to electrically connect the electric wiring 49A having the electromagnetic switch 49 to the operation switches 36 and 43, it is possible to reduce the number of electric wirings electrically connected to the operation switch as compared with the conventional hydraulic unit. The electric wires 38A, 40, 42 and 38B, 45, 47 that are electrically connected to the operation switches 36, 43 can be integrated into a small shape, and the handleability of the operation switches 36, 43 can be improved. In addition, since the rectifier housing box 55, which houses the rectifiers 52A, 52B, 52C, and 52D, is mounted on the inner wall surface of the outer cover 34, it is not necessary to secure a special installation location, and the hydraulic unit is enlarged. You can do it without doing it.

In addition, in the embodiment, two solenoid valves 32 and 33 and two operation switches 36 and 43 are provided, but it goes without saying that each solenoid valve and operation switch may be provided one.

[Effect of device]

As described above, the present invention includes an electromagnetic motor for controlling the flow of oil, which has an electric motor for driving a hydraulic pump for sucking and discharging oil and two electromagnets on an upper plate of a tank provided for storing oil therein. The valve is mounted, and the operation switch for remotely operating the electric motor and the solenoid valve is arranged separately from the tank. The operation switch is the first contact and the solenoid that opens and closes between one electromagnet of the solenoid valve and the DC power supply side. It has a second contact that opens and closes between the other electromagnet of the valve and the DC power supply side, and electrically connects the electric motor and the DC power supply side through an electromagnetic switch that opens and closes the contact by energizing and de-energizing the operation switch. The solenoid switch and each electromagnet of the solenoid valve are electrically connected through a rectifier so that the solenoid switch opens and closes when electricity is not supplied to each electromagnet of the solenoid valve. The flow of current from each electromagnet side of the solenoid valve to the solenoid switch side is allowed so that the current flowing from the electromagnet side to the solenoid switch side does not flow to the non-energized electromagnet side, and from the solenoid switch side to each electromagnet side of the solenoid valve. The operation switch may have the first contact point and the second contact point because the current flow can be blocked freely, and the manufacturing cost of the entire hydraulic unit can be kept low by using the small and light operation switch.

Further, since the operation switch does not require electric wiring for electrically connecting the electromagnetic switch, the number of electric wires electrically connected to the operation switch can be reduced as compared with the conventional hydraulic unit, and the electric wiring electrically connected to the operation switch can be reduced. Since it can be integrated into a small shape, the handling of the operation switch can be improved, and the manufacturing cost can be further reduced.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a front view of a hydraulic unit with a partial cross section, FIG. 2 is an electric circuit diagram, and FIGS. An example is shown, FIG. 3 is a front view of a hydraulic unit with a partial cross section, FIG. 4 is a hydraulic circuit diagram, and FIG. 5 is an electric circuit diagram. 25 ... Tank, 25A ... Upper plate, 26 ... Hydraulic pump, 28 ...
… Motor, 32, 33 …… Solenoid valve, 32A, 32B, 33A, 33B ……
Electromagnet, 36, 43 ... Operation switch, 36A, 43A ... First contact, 36B, 43B ... Second contact, 48 ... DC power supply, 49 ... Electromagnetic switch, 52A, 52B, 52C, 52D ... Rectifier .

Claims (1)

(57) [Scope of utility model registration request] 1. An electromagnetic valve for controlling a flow of oil having an electric motor for driving a hydraulic pump for sucking and discharging oil and two electromagnets is mounted on an upper plate of a tank provided for storing oil therein. The operation switch for remotely controlling the electric motor and the solenoid valve is arranged separately from the tank, and the operation switch opens and closes between one electromagnet of the solenoid valve and the DC power supply side.
It has a second contact that opens and closes between the contact and the other electromagnet of the solenoid valve and the DC power supply side, and electrically connects the motor and the DC power supply side through an electromagnetic switch that opens and closes the contact by energizing and de-energizing. , The electromagnetic switch and each electromagnet of the solenoid valve are electrically connected through a rectifier so that the electromagnetic switch opens and closes when each electromagnet of the solenoid valve is energized or de-energized by operating the operation switch. Allowing the flow of current from each electromagnet side of the solenoid valve to the solenoid switch side so that the current flowing from the energized electromagnet side of the valve to the solenoid switch side does not flow to the non-energized electromagnet side, and each electromagnet of the solenoid valve from the solenoid switch side A hydraulic unit that is arranged so that it can block the flow of current to the side.