JP2000120556A - Hydraulic power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reduce a vibration and a noise being generated due to vibration with very simple structure, in a hydraulic power unit which is hangingly installed. SOLUTION: In this hydraulic power unit, a U-shaped hanging member is integrally installed so as to make it go along a bottom face 23 of a casing 2 and an opposed side face 24, while a reinfroced body 33 is installed in a bottom plate part 31 of the hanging member 3, thereby making improvements in rigidity. With this constitution, a vibration is well controlled, and thus a noise to be produced due to the vibration is reducible in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic unit used for a hydraulically driven industrial machine or the like.

[0002]

2. Description of the Related Art A hydraulic unit of this type is often mounted on a vehicle among industrial machines, and in such a case, it is generally mounted on a chassis of the vehicle. In particular, when such a hydraulic unit is hung from the chassis and attached, conventionally, as shown in FIG. 4, an attaching plate 103 such as a sheet metal member is provided on each of opposing side surfaces 102 of a casing 101 constituting the hydraulic unit 100. There has been adopted a method of welding two places each, a total of four places, and hanging down the hydraulic unit 100 via these mounting plates 103 (only one side surface 102 is shown in FIG. 4).

[0003]

However, in the above-described hanging structure in which a plurality of mounting plates are welded to a casing,
Since the casing is made of a thin sheet metal, the rigidity of the hydraulic unit itself is low, so that the rigidity of the mounting is reduced, and the hydraulic unit is easily twisted or vibrated. In particular, since the hydraulic unit itself vibrates due to the operation of the electric motor or the hydraulic pump, in combination with the vibration of the vehicle, in a structure having such a low rigidity, the vibration may be amplified and a large noise may be generated. is there. On the other hand, a method of increasing the rigidity of the hydraulic unit by increasing the thickness of the casing to suppress vibration is also conceivable. However, such a method causes an increase in weight and is not preferable in view of the application to mounting on a vehicle.

In order to cope with such a problem, according to the present invention, a hydraulic pump, an electric motor, and the like built in the casing are supported by a bottom plate of the casing, and their vibrations propagate through the bottom plate to cause noise. This was done for the first time, and a U-shaped fishing member was integrally attached along the bottom surface and the opposing side surface of the casing, and the bottom plate portion of the fishing member was rigidly attached. The main object of the present invention is to effectively reduce vibration and noise generated due to the vibration with a very simple structure by making the height higher.

[0005]

That is, a hydraulic unit according to the present invention comprises a unit main body having at least an electric motor and a hydraulic pump driven by the electric motor mounted on a casing; A lowering member for attaching to the base so as to hang it down, wherein the lowering member is attached to a bottom plate portion attached to the bottom surface of the casing, and from both ends of the bottom plate portion to opposing side surfaces of the casing. And a reinforcing member disposed on the bottom plate portion, the side plate portion being erected along the base plate and having an upper end attached to the base.

In such a case, not only is the hanging member arranged along the outer periphery of the casing to improve the rigidity as a whole, but also the reinforcing member is attached to the bottom plate, so that it becomes a vibration source. Since the rigidity of the bottom plate mainly supporting the built-in components such as the electric motor is particularly improved, the vibration is extremely effectively suppressed, and the noise caused by the vibration can be greatly reduced. In addition, it is possible to preferably reduce noise caused by amplification and propagation of the vibration of the base of the vehicle or the like to the hydraulic unit, or noise generated by resonance between the base vibration and the vibration of the hydraulic unit. In addition, since the weight of the catching member can be easily reduced, the weight of the hydraulic unit does not increase significantly.

As a specific embodiment for suppressing vibration more effectively without particularly increasing the weight, a bottom plate and a side plate are integrally formed of a band-shaped sheet metal material.
It is desirable that the reinforcing member is made of a channel-shaped member. In order to properly carry out the hanging on the base, it is preferable to arrange a pair of hanging members in parallel with the casing.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1, 2, and 3, the hydraulic unit according to the present invention has a unit main body 1 attached to a vehicle (not shown) serving as a base through a catching member 3.

The unit body 1 comprises an electric system 4 including an electric motor 41, a hydraulic system 5 including a hydraulic pump 51, and a casing 2 containing the electric system 4 and the hydraulic system 5. As shown in FIG. 3, the electric system 4 includes a DC electric motor 41, an introduction terminal B for electric power supplied from an external power supply such as a battery of a vehicle, and wiring connecting the introduction terminal B and the electric motor 41. The battery switch 42 and the contactor 43 provided in series on the upper side and a control terminal C for controlling the operation of the contactor 43 are connected by wiring. Thus, the battery switch 42 is turned on and the control terminal C
By applying a predetermined voltage to the contactor 43, the contactor 43 is turned on, and the electric motor 41 is driven to rotate.

As shown in FIG. 3, the hydraulic system 5 includes a hydraulic oil tank 50, a hydraulic pump 51 rotationally driven by the electric motor 41, a first input / output port 52 serving as a connection port with an external hydraulic circuit, and The second input / output port 53, the first and second input / output ports 52 and 53, and the hydraulic pump 5
It has a control unit 54 and an input / output unit 55 interposed therebetween.

The hydraulic pump 51 is of a fixed displacement type that sucks hydraulic oil from a tank 50 through a filter F1 and discharges hydraulic oil from a discharge port thereof. The controller 54 includes an input port 54a connected to the pump discharge port, an output port 54b, a main path 54d for connecting the input / output ports 54a and 54b via a check valve 54c, and a check valve 5
A first branch path 54e connecting the main path 54d and the tank 50 on the upstream side of the first branch path 5c.
The main passage 54d and the tank 5 are located downstream of the relief valve 54f provided on the
0 and a filter F2, an electromagnetic valve 54h, and a flow control valve 54i provided in series on the second branch path 54g, and are integrally formed on the adapter plate 6. Have been. The relief valve 54f regulates the pressure of the hydraulic fluid discharged from the pump 51. Also, the electromagnetic valve 54h is opened by applying a voltage, and the first or second input / output port 5 is opened.
It is used so that the amount of the hydraulic fluid returning from the tanks 2 and 53 to the tank 50 can be adjusted by the flow control valve 54i.

On the other hand, the input / output unit 55 has an input port 55a connected to an output port 54b of the control unit 54 by a pipe.
A first communication path 55b for directly connecting the input port 55a to the first input / output port 52;
Through the filter F3, the first solenoid valve 55d, the second solenoid valve 55e, and the filter F4.
3 and is formed integrally with the manifold block 7. The first electromagnetic valve 55d and the second electromagnetic valve 55e close the second communication passage 55c when no voltage is applied to both, and operate the second communication passage 55c when a voltage is applied to either one. Allow liquid to flow in only one direction. Further, if a voltage is applied to both, the hydraulic fluid is allowed to flow in both directions through the second communication path 55c.

Thus, as described above, the electric system 4 and the hydraulic system 5
, The electromagnetic valves 54h, 55d, 5
An operation such as 5e is intended to flexibly apply to various external hydraulic circuits. As shown in FIGS. 1 and 2, the casing 2 has a rectangular parallelepiped main body 2 that opens to one side and upward.
1 and a cover 22 for closing the opening of the casing 2, the tank 50, the hydraulic pump 51, the electric motor 41, the adapter plate 6, etc.
And is integrally fixed to an L-shaped mounting plate 25 attached to the bottom plate 23 of the side view. The manifold block 7 is attached to the main body. Reference numeral 26 in the drawing indicates a soundproof material attached to the lid.

In this embodiment, the unit main body 1 having such a structure is attached to a not-shown chassis via a pair of hanging members 3 arranged side by side as shown in FIG. The lowering member 3 includes a bottom plate portion 31 and side plate portions 3 erected integrally from both ends of the bottom plate portion 31.
2 and a reinforcing member 33 attached to the bottom plate portion 31.

The bottom plate portion 31 and the side plate portion 32 are band-shaped integrally formed so as to form a U-shape. The front end of the side plate portion 32 is bent outward, and a mounting hole 32b for the chassis is formed in the bent portion 32a. Has been drilled. The reinforcing member 33 is formed of a channel member that opens downward, and
1, and has the same width and length as those of the casing 1, and is disposed between the edges of the bottom plate 23 of the casing 2.

Each side plate portion 32 is attached to the upper end of the opposite side surface 24 of the casing 2 using a bolt B1. The bottom plate portion 31 and the reinforcing member 33 are integrally attached at two locations (a total of four locations because there are a pair of fishing members 3) by bolts B2 penetrating the mounting plate 25 and the bottom plate 23 of the casing 2. The reinforcing member 33
A bolt B3 disposed at one end of the bolt is for tightly coupling the bottom plate portion 31 and the reinforcing member 33.

In such a configuration, for example, the electric motor 41
And the vibration caused by the operation of the hydraulic pump 51 are:
It is mainly transmitted to the bottom plate 23 of the casing 2 via the mounting plate 25. However, since the rigid body 33 having high rigidity is attached to the bottom plate 23, the vibration is suppressed, and the noise caused by the vibration can be reduced. Particularly, in this embodiment, since the mounting plate 25, the bottom plate 23 of the casing 2, the bottom plate portion 31 of the fishing member 3, and the reinforcing member 33 are integrally screwed and tightened by the bolts B2, vibration and noise can be reduced. The effect becomes remarkable.

In addition, since the lowering member 3 increases the rigidity of the entire hydraulic unit, it is possible to suppress not only noise (for example, the adapter plate 6 easily vibrates and generate noise) generated by the hydraulic unit itself, but also It is possible to preferably reduce noise caused by vibration of the vehicle, or noise caused by resonance between vibration of the vehicle and vibration of the hydraulic unit.

In addition, the lowering member 3 has a bottom plate 31 and a side plate 32 which are light and band-shaped, and the reinforcing member 33 has the rigidity of a channel member and is lightweight. No significant weight increase is caused. As described above, according to the present embodiment, it is possible to suppress noise generated from the hydraulic unit without causing a significant increase in weight.

The present invention is not limited to the above embodiment. For example, the reinforcing member is not limited to the channel member, and may be, for example, an L-shaped cross section as long as required rigidity capable of suppressing vibration and noise can be obtained. Further, the reinforcing member may be integrally formed with the bottom plate of the fishing member. Further, the number of the catching members is not limited to a pair, and a wide one may be provided singly, or three or more may be provided. Of course, it goes without saying that the internal structure of the hydraulic unit is not limited to the above embodiment.

In addition, the present invention is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0022]

As described above in detail, according to the hydraulic unit according to the present invention, not only the catch member is disposed along the outer periphery of the casing, but also a highly rigid reinforcing member is provided on the bottom plate. Since it is attached, the vibration is extremely effectively suppressed, and the noise caused by the vibration can be reduced. In addition, since the lowering member increases the rigidity of the hydraulic unit as a whole, not only can the noise generated by the hydraulic unit itself be suppressed, but also noise generated due to vibration of the base of a vehicle or the like, or vibration of the base. It is possible to preferably reduce noise or the like generated by resonance of the vibration of the hydraulic unit. In addition, since it is easy to reduce the weight of the catch member, there is an effect that the weight of the hydraulic unit does not increase significantly.

[Brief description of the drawings]

FIG. 1 is a front view showing the internal structure of a hydraulic unit according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic circuit diagram showing the internal structure of the hydraulic unit of the embodiment.

FIG. 4 is a front view showing a conventional hydraulic unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Unit main body 2 ... Casing 3 ... Lowering member 31 ... Bottom plate part 32 ... Side plate part 33 ... Reinforcement body 41 ... Electric motor 51 ... Hydraulic pump (hydraulic pump)

Claims (1)

[Claims] 1. A unit main body having at least an electric motor and a hydraulic pump driven by the electric motor mounted on a casing, and a lowering member for attaching the unit main body to a base so as to hang it down. A lowering member is attached to the bottom surface of the casing, and a bottom plate portion is erected from both ends of the bottom plate portion along opposing side surfaces of the casing, and an upper end portion is attached to the base. A hydraulic unit comprising: a side plate portion to be provided; and a reinforcing member disposed on the bottom plate portion.