JPH088308Y2 - Hydraulic system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a hydraulic system including an electric motor and a pump which is driven by the electric motor to suck and discharge hydraulic oil in an oil tank.

[Conventional technology]

Conventionally, as shown in FIG. 5, this type of hydraulic system has a base plate member 34 fixedly mounted on an upper plate 32 of an oil tank 31 which stores hydraulic oil therein via a vibration absorbing member 33 which absorbs vibration. An electric motor 35 having a rotary shaft 35A at both ends and two pumps 36 and 37 are mounted and fixed on the substrate member 34. And the electric motor 35
The rotary shaft 35A of the pump is connected to the rotary shafts 36A and 37A of the pumps 36 and 37 via couplings 38 and 39, respectively. When the electric motor 35 drives the pumps 36 and 37, the hydraulic oil in the oil tank 31 is sucked and discharged. It Further, at one end of the electric motor 35, a cooling fan 40 for cooling the heat generated by the operation of the electric motor 35 by its own driving is attached to the rotary shaft 35A.

[Problems to be solved by the invention]

In this way, the pumps 36 and 37 driven at both ends of the rotary shaft 35A of the electric motor 35 can drive many pumps as compared with those driven at only one end of the rotary shaft. Even if the pump at the one end fails, the pump at the other end can be driven, so that there is an advantage that the device itself can be effectively operated. However, in the conventional device, the rotary shafts 35A, 3A of the pumps 36, 37 and the electric motor 35 are
Since the two couplings 38 and 39 and the cooling fan 40 are attached to connect the 6A and 37A, there is a problem that the entire apparatus becomes large.

The present invention solves such a problem, and provides a hydraulic device capable of connecting the rotary shafts of each pump and an electric motor without increasing the size of the entire device.

[Means for solving problems]

For this reason, the present invention includes an electric motor having a rotary shaft exposed on both sides, and two pumps driven by the electric motor to suck and discharge hydraulic oil stored in an oil tank. The rotary shaft of the pump is fitted into the fitting holes provided at the end face of the rotary shaft, and the pump coupling body is provided by connecting the electric motor and the two pumps. In the oil tank, a holding member is provided so as to face the inner wall above the oil surface of the stored working oil, and a supporting member is mounted on the holding member via a vibration absorbing member to store the working oil in the oil tank. A pump assembly is provided by immersing the pump assembly in an upper part, and the pump assembly has an area that allows the pump assembly to be taken out from the opening of the oil tank, a discharge pipe for supplying the hydraulic oil discharged by the pump, and an operation. With a mounting board equipped with a return pipe that returns oil to the oil tank, Comprising providing to close the mouth.

[Action]

In the structure of the present invention, the pump coupling body, in which the rotation shaft of the pump is inserted into the insertion hole of the rotation shaft of the electric motor and the electric motor and the two pumps are connected to each other, is the working oil stored in the oil tank. It is immersed in. For this reason, the electric motor is always in an oil-cooled state, and it is possible to eliminate the need for a cooling fan like the conventional device and to eliminate the need for a coupling. The length of the longitudinal direction connecting the electric motor and the pump can be shortened and the device can be downsized. can do.

〔Example〕

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

1 to 3, reference numeral 1 denotes an oil tank, which is formed in a quadrangular shape so as to store a certain amount of hydraulic oil inside by opening an upper portion, and an opening 1A in the upper portion is provided with an upper plate 2 and a mounting substrate 3 And the inside is hermetically sealed. The upper plate 2 is fixed to the oil tank 1 by a plurality of fixing bolts 4,
It can be attached and detached by attaching and detaching the fastening bolt 4. Reference numeral 5 denotes a pump coupling body, which is composed of an oil-immersed electric motor 7 having rotary shafts exposed on both sides, and two pumps 8 and 9 driven by the electric motor 7 to suck and discharge hydraulic oil stored in the oil tank 1. Made of The electric motor 7 is provided with a fitting insertion hole 11 along with a key groove 11A in one of the rotating shafts 6 and is opened to the end face 10 of the rotating shaft 6, and a pump 8 having a key portion 12A in the fitting insertion hole 11. The rotary shaft 12 is fitted into the key groove 11A by inserting the key portion 12A into the key groove 11A, and is connected to the pump 8.

In addition, the electric motor 7 is similarly connected to the pump 9 on the other rotating shaft (not shown). Reference numeral 13 denotes a support member, a pair of leg portions 14, a flat plate portion 16 fixed to the leg portions 14 by fastening bolts 15, two standing portions 17 standing upright on the flat plate portion 16, and a standing member. On the upper end surface of the installation portion 17 in the drawing, which is parallel to the flat plate portion 16 and is extended to a position near the oil tank inner wall 1B, there are two base plate portions 18 each provided with a fastening portion 18A. The electric motor 7 of the pump combination 5 which connects the pumps 8 and 9 of the table is fixed to the pair of legs 14. Reference numeral 19 denotes a holding member that is welded to the inner wall of the oil tank so as to face the inner wall of the oil tank. The holding member includes a vibration damping rubber member 19A as a vibration absorbing member, and the upper surface of the vibration damping rubber member 19A is positioned above the oil surface L to support The mounting surface 19B to be mounted is used. Then, the fastening portion 18A provided at the end of the base plate portion 18 of the supporting member 13 is mounted on the mounting surface 19B of the holding member 19 via the anti-vibration rubber member 19A to pump the working oil stored in the oil tank 1. The combined body 5 is arranged by immersion. Reference numeral 20 denotes a bolt, and a nut is screwed to fix the support member 13 to the holding member 19. Further, in order to maintain the pump assembly 5, the upper plate 2 is removed from the opening 1A of the oil tank 1 and the fixing portion 18
The pump coupling body 5 is taken out from the opening 1A of the oil tank 1 by removing the nut A and lifting the base plate portion 18 upward. The size of the upper plate 2 is set so that it can be taken out when the pump coupling body 5 is taken out from the opening 1A of the oil tank 1. 22 is a suction pipe to which a strainer 23 is attached, and 25 is a discharge pipe for feeding the hydraulic oil discharged by the pumps 8 and 9, respectively, which are provided on the mounting substrate 3. An internal discharge pipe 24 connects the discharge sides of the pumps 8 and 9 and the discharge pipe 25, respectively. 26 is a check valve provided on the discharge pipe 25, 27 is an air breather that also serves as an oil supply port, and 28 is the mounting substrate 3
It is a return pipe installed in.

 Next, the operation of this configuration will be described.

When the rotating shaft 6 of the electric motor 7 is driven by energization of the electric motor 7, the rotating shaft 12 of the pumps 8 and 9 is rotated via the key portion 12A, and the working oil in the oil tank 1 is sucked through the strainer 23. At the same time as being sucked into 22, the working oil flows through the inner discharge pipe 24 and the discharge pipe 25 by the pumps 8 and 9, and the working oil is supplied to an actuator (not shown). Then, the hydraulic oil from this actuator flows back from the return pipe 28 into the oil tank 1 to control the operation of the actuator.

In such an operation, the pump coupling body 5 provided by inserting the rotary shafts of the pumps 8 and 9 into the fitting holes of the rotary shaft of the electric motor 7 and connecting the electric motor 7 and the two pumps 8 and 9 to each other,
The oil tank 1 is immersed in the stored hydraulic oil. Therefore, the electric motor 7 is always in an oil-cooled state, and it is possible to eliminate the need for a cooling fan as in the conventional device and to eliminate the need for a coupling, and to shorten the length in the longitudinal direction connecting the electric motor 7 and the pumps 8 and 9. Thus, the device can be downsized. Further, since the pump coupling body 5 is disposed so as to be immersed in the oil in the oil tank 1, it is possible to favorably prevent the noise generated from the electric motor 7 or the pumps 8 and 9 from being propagated to the outside. Furthermore, when the upper plate 2 is removed, the opening 1A of the oil tank 1 can be secured in such a size that the pump coupling body 5 can be taken out, and the upper plate 2 is provided with the discharge pipe 25, the return pipe 28 and the like. Since the upper plate 2 is removed, the electric motor 7 and the pump 8,
9 can be taken out of the oil tank 1, and maintenance of the electric motor 7 and the pumps 8 and 9 can be carried out extremely easily without spending a great deal of labor.

[Effect of device]

As described above, according to the present invention, the rotating shaft of the electric motor includes the electric motor having the rotating shaft exposed on both sides, and the two pumps that are driven by the electric motor to suck and discharge the working oil stored in the oil tank. The rotary shaft of the pump is fitted into the fitting holes formed in the end face of the rotary shaft, and a pump coupling body that connects the electric motor and the two pumps is provided, and the pump coupling body is provided with a support member. Is fixed, and a holding member is provided to face the inner wall of the oil tank above the oil surface of the stored working oil,
A support member is mounted on the holding member via a vibration absorbing member, and the pump coupling body is provided in the oil tank by immersing the pump coupling body in the stored hydraulic oil. The pump coupling body can be taken out from the opening of the oil tank. By providing the upper plate having a width, the discharge pipe for feeding the hydraulic oil discharged by the pump and the mounting substrate having the return pipe for returning the hydraulic oil to the oil tank, the opening is closed, It is not necessary to provide a cooling fan for cooling the electric motor or a coupling for connecting the rotating shaft of the electric motor and the rotating shaft of the pump. Therefore, the length in the longitudinal direction connecting the electric motor and the pump can be shortened to reduce the size of the device. You can measure.

Further, since the pump assembly is immersed in the oil in the oil tank, noise generated from the electric motor or the pump can be effectively prevented from being propagated to the outside.

Furthermore, when the upper plate is removed, the opening for the oil tank can be secured so that the pump assembly can be taken out, and since there is no discharge pipe, return pipe, or other piping provided on this upper plate, the upper plate must be removed for support. The electric motor and the pump can be taken out of the oil tank by a simple work of hoisting the members, and the electric motor and the pump can be extremely easily maintained without spending a lot of labor.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a hydraulic system showing an embodiment of the present invention, FIG. 2 is a partially cutaway right side view of one embodiment, FIG. 3 is a plan view of one embodiment, and FIG. Is a partially enlarged cross-sectional view of the main part A of FIG. 1, and FIG. 5 is a front view of a hydraulic device showing a conventional example. 1 ... oil tank, 1A ... opening, 1B ... oil tank inner wall,
2 ... Upper plate, 5 ... Pump combination, 6 ... Electric motor rotating shaft, 7 ... Electric motor, 8, 9 ... Pump, 11 ... Fitting hole,
12 …… Rotary shaft of pump, 13 …… Supporting member, 18A …… Fastening part, 19 …… Holding member, 19B …… Mounting surface.

Claims (1)

[Scope of utility model registration request] 1. An electric motor having a rotary shaft exposed to both sides,
Two pumps that are driven by an electric motor and suck and discharge the stored operating oil in an oil tank are provided, and the pump is rotated into a fitting hole formed in the rotary shaft of the electric motor and opened to the end face of the rotary shaft. A pump coupling body, in which the shafts are respectively inserted and connected to the electric motor and the two pumps, is provided, a supporting member is fixed to the pump coupling body, and a holding member is provided on the inner wall above the oil level of the working oil stored in the oil tank. Are provided so as to face each other, a supporting member is mounted on the holding member via a vibration absorbing member, and the pump coupling body is disposed by being immersed in the hydraulic oil stored in the oil tank. The pump coupling body is provided at the opening of the oil tank. The opening is closed by an upper plate having a width that allows it to be taken out from the outer part, and a mounting board having a discharge pipe for feeding the hydraulic oil discharged by the pump and a return pipe for returning the hydraulic oil to the oil tank. The hydraulic system provided by