JP3956751B2 - Hydraulic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic device used in a hydraulic drive type industrial machine or the like.
[0002]
[Prior art]
As shown in FIG. 5 , the conventional hydraulic device includes a tank T in which a storage space F that can store a hydraulic pump 119 and an electric motor 120 that are noise sources is formed. There has been a structure in which a manifold (adapter) 117 to which the hydraulic pump 119 and the electric motor 120 are fixed is floated and supported from the tank T via an elastic body such as rubber 114 to prevent noise.
[0003]
Further, in the hydraulic device having such a structure, the oil is returned to the tank T from a pipe connected to the tank T, for example, the suction pipe 123 for supplying hydraulic oil from the tank T to the hydraulic pump 119 or the relief valve 124. As a return pipe for the purpose, a soft and flexible material such as a rubber hose was used so that vibrations from the hydraulic pump 119 and the electric motor 120 are not transmitted to the tank T.
[0004]
[Problems to be solved by the invention]
However, in the hydraulic apparatus as shown in FIG. 5 , the vibration of the noise source is absorbed only by the elasticity of the elastic body such as the vibration isolating rubber 114, and the vibration absorbing effect is low. Further, as described above, in order to make use of the elasticity of the vibration isolating rubber 114, a rubber hose is used as a flexible material in order to make use of elasticity for the pipe between the tank T and a member that needs to be connected to the tank T. However, such a rubber hose cannot be directly connected to the manifold 117 or the tank T. As shown in FIG. 6 , a cylindrical connector 131 screwed into the manifold 117 or the like is connected to the rubber hose. It is necessary to insert it into the return pipe 122 and fix it using a band 132 or the like, which increases the number of parts and increases the number of processes. Such fixing is necessary for both ends of the rubber hose, in Figure 5, extends to four locations.
[0005]
The present invention provides a hydraulic device that can easily suppress vibrations transmitted from noise sources such as a hydraulic pump and an electric motor, and thus reduce noise, without causing such problems. For the purpose.
[0006]
[Means for Solving the Problems]
The hydraulic device of the present invention includes an electric motor, a hydraulic pump driven by the electric motor to suck in and discharge hydraulic oil, and supports the electric motor and the hydraulic pump, and at least a region for accommodating the electric motor. An inner wall member formed on the inside and a tank including the inner wall member and an outer wall member that forms a space for storing hydraulic oil between the inner wall member and the inner wall member of the tank is an elastic body. is held in the outer wall member via Rutotomoni, adapters said hydraulic pump is secured to the outer wall member side on the bottom surface of the inner wall member and wherein the fixed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the hydraulic device of the present invention will be described in detail. FIG. 1 is a schematic configuration diagram showing a hydraulic apparatus of the present embodiment.
[0008]
Hereinafter, the hydraulic apparatus of the present embodiment will be described with reference to FIG. The tank T that stores the hydraulic oil S includes an inner wall member 11 and an outer wall member 12 that includes the inner wall member 11 and forms a space for storing the hydraulic oil S between the inner wall member 11 and the inner wall member 11. Is supported by an anti-vibration rubber 14 placed on a support member 13 fixed to the outer wall member 12 and is not in direct contact with the outer wall member 12 in a floating state. A lid 16 having a hole for projecting a port 15 to be described later is attached and attached to the upper end on the open surface side of the outer wall member 12 of the tank T so that the hydraulic oil S does not leak or foreign matter enters. .
[0009]
Further, a manifold 17 that also serves as an adapter is fixed to the bottom surface of the inner wall member 11, and hydraulic pressure is applied to the outer wall member 12 side so that the hydraulic oil S in the tank T is sucked through the suction filter 18 and the suction pipe 23. The pump 19 is fixed, and an electric motor 20 for driving the hydraulic pump 19 is fixed on the opposite side. Therefore, since the hydraulic pump 19 is not lifted from the inner wall member 11 of the tank T, it is not necessary to use a flexible material for the pipe from the hydraulic pump 19 to the tank T.
[0010]
A discharge pipe 21 having a port 15 for supplying hydraulic oil S to the outside by switching a solenoid valve (not shown) provided inside the manifold 17 is attached to the manifold 17 and is connected from a hydraulic cylinder or the like. A return pipe 22 is attached to return the hydraulic oil S that has passed through (not shown) to the tank T. The discharge pipe 21 and the return pipe 22 are directly screwed into the manifold 17 as shown in FIG. Further, a relief valve 24 is attached to the manifold 17 so that the hydraulic oil S blown over the relief pressure returns to the tank T.
[0011]
Next, the operation of the hydraulic apparatus of this embodiment shown in FIG. 1 will be described. First, the electric motor 20 is driven by energizing from a power supply (not shown), and the hydraulic pump 19 is operated by the driving force. The hydraulic oil S sucked up by the hydraulic pump 19 via the suction filter 18 and the suction pipe 23 is supplied to a hydraulic cylinder (not shown) via the discharge pipe 21 and the port 15.
[0012]
In particular, vibration is generated from the electric motor 20 and the hydraulic pump 19 that are in operation, and this vibration is caused by the manifold 17 via the manifold (adapter) 17 to which the electric motor 20 and the hydraulic pump 19 are fixed. Although it is transmitted to the fixed inner wall member 11, the inner wall member 11 is supported by the vibration isolating rubber 14, and the inner wall member 11 and the member fixed to the inner wall member 11 are in a state of floating from the outer wall member 12. It is absorbed by the hydraulic oil S together with the vibration rubber 14 and is sufficiently suppressed before being transmitted to the outer wall member 12. Therefore, the noise generated with the vibration is also reduced.
[0013]
After supplying the hydraulic oil S to the hydraulic cylinder and the like, the hydraulic oil S returns from the hydraulic cylinder and the like to the tank T through the return pipe 22 by switching the solenoid valve.
[0014]
By the way, in the present embodiment of FIG. 1, for example, in the case where the amount of hydraulic oil supplied to a hydraulic cylinder or the like is small, that is, even if the oil level falls, the return pipe 22 does not fall below the manifold 17. Can be omitted. Further, in the present embodiment, parts that need to be piped to the tank T, such as the hydraulic pump 19, the suction pipe 23, the return pipe 22, and the relief valve 24, are provided on the side where the inner wall member 11 and the hydraulic oil S are in contact with each other. Therefore, even if the hydraulic oil S leaks at this portion, it only returns to the tank T, and the influence of leakage to the outside of the apparatus is eliminated.
[0015]
In this embodiment, as the inner wall member 11, it has been configured to be supported on the anti-vibration rubber 14 mounted on the support member 13 fixed to the outer wall member 12, shown in FIG. 3, Ma A modification in which the nihold 17 is fixed on the support base 50 via a vibration isolating rubber 32 is also included in the present invention as a modification.
[0016]
Further, as shown in FIG. 4 , components such as various valves, for example, the switching valve 41 and the laminated valve 42 are fixed to a base plate 46 fixed to the upper surface of the lid 16 and integrated with the hydraulic device body. It is possible. The base plate 46 is connected to the discharge pipe 43 and the return pipe 44 and has a port 45 formed therein. In this case, in order to suppress the vibration from the manifold 17 to which the electric motor and the hydraulic pump are fixed being transmitted to the lid 16, the switching valve 41 and the laminated valve 42, the discharge pipe 43 and the return pipe 44 include It is necessary to use a soft and flexible material such as rubber.
[0017]
【The invention's effect】
As described above, according to the present invention, the tank is divided into the inner wall member and the outer wall member, and the inner wall member is supported by the outer wall member by the anti-vibration rubber. Therefore, in the accommodation space formed inside the inner wall member. The vibration of the housed electric motor and hydraulic pump is absorbed by the anti-vibration rubber and hydraulic oil and can be prevented from being directly transmitted to the outer wall member of the tank, reducing the noise generated by such vibration. Can do. In addition, it is not necessary to use a rubber hose that is troublesome for piping in order to exert the elastic action of the vibration-proof rubber.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hydraulic apparatus according to the present embodiment.
FIG. 2 is a schematic configuration diagram illustrating connection of piping according to the present embodiment.
FIG. 3 is a schematic configuration diagram of a hydraulic device that is a modified example of the embodiment.
FIG. 4 is a diagram showing a case where a hydraulic circuit is changed in the hydraulic apparatus of the present embodiment.
FIG. 5 is a schematic configuration diagram of a conventional hydraulic device.
FIG. 6 is a schematic configuration diagram showing connection of conventional piping.

Claims (1)

An electric motor, a hydraulic pump that is driven by the electric motor and sucks and discharges hydraulic oil, an inner wall member that supports the electric motor and the hydraulic pump and that has at least a region for accommodating the electric motor formed inside, A hydraulic apparatus including a tank including an outer wall member including the inner wall member and forming a space for storing the hydraulic oil between the inner wall member and the inner wall member. held by the member Rutotomoni, hydraulic system, characterized in that the adapter is fixed to the hydraulic pump is secured to the outer wall member side on the bottom surface of the inner wall member.

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