JP3135140B2 - Hydraulic pressure source device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure source device in which an electric motor and a hydraulic pump driven by the electric motor for sucking and discharging hydraulic fluid stored in a tank are integrally provided and arranged in the tank.

[0002]

2. Description of the Related Art As this type of hydraulic pressure source device, there is one as shown in FIG. In this device, an electric motor 1 and a hydraulic pump 2 are immersed and arranged in a hydraulic fluid stored in a tank 3, and the hydraulic pump 2 is driven by the electric motor 1 to suck and discharge the hydraulic fluid from a suction pipe 4. The hydraulic fluid discharged to the pipe 5 and discharged from the hydraulic pump 2 flows from the discharge pipe 5 through the discharge port 8 through the manifold 7 fixed to the upper plate 6 of the tank 3, and is supplied to an external hydraulic device (not shown). It is provided that the hydraulic fluid returned from the hydraulic device flows through the return pipe 10 from the return port 9 and is returned to the tank 3. The discharge pipe 5 is formed of a flexible member such as a rubber pipe or a resin pipe, and is provided in a bent shape due to the arrangement position of the electric motor 1 and the hydraulic pump 2. One end is connected to the hydraulic pump 2 and the other end is connected. It is connected to the lower part of the manifold 7 fixed to the upper plate 6 of the tank 3.

[0003]

However, in this configuration, the discharge pipe 5 made of a flexible member is provided in a bent shape and both ends thereof are connected to the hydraulic pump 2 and the manifold 7 side. Due to the pressure pulsation of the working fluid discharged from the pressure pump 2, vibration occurs in the discharge pipe 5 such that the radius of curvature fluctuates, and there is a problem that operation noise increases due to the vibration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a hydraulic pressure source device capable of reducing the operation noise without causing vibration in the discharge pipe in which the radius of curvature fluctuates. is there.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has a tank in which a hydraulic fluid is formed so as to be able to store therein, and drives a hydraulic pump for sucking and discharging the hydraulic fluid into the tank and a hydraulic pump. One end is connected to the hydraulic pump and the other end is connected to the fixed part on the tank side so that the hydraulic fluid discharged from the hydraulic pump is supplied to the outside of the tank. The discharge tube was constituted by a straight tube portion made of a flexible member and a bent tube portion made of a rigid member.

[0006]

In the above construction of the present invention, the discharge pipe comprises a straight pipe section made of a flexible member and a bent pipe section made of a rigid member, and the bent pipe section of the discharge pipe is made of a rigid member and is a hydraulic pump. Since the radius of curvature does not fluctuate due to the pressure pulsation of the hydraulic fluid to be discharged, vibration in the form of a radius of curvature fluctuating in the discharge pipe can be prevented, and operation noise can be reduced satisfactorily.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 11 denotes a tank which is formed in a rectangular parallelepiped box shape with an upper opening, and is provided so as to be able to store a hydraulic fluid therein. L1 is the level of the hydraulic fluid stored in the tank 11. An upper plate 12 provided in the tank 11 is provided so as to close an upper opening of the tank 11. Reference numeral 13 denotes a receiving plate fixed to the inner surface of the upper portion of the side wall of the tank 11 by welding. Reference numeral 15 denotes a holding frame which has a horizontal mounting portion 16 and hanging portions 17 and 18 erected on both ends of the mounting portion 16, and the hanging portions 17 and 18 have mounting pieces 19 and 2 at their upper ends.
0 is fixedly provided so as to project in the direction perpendicular to the paper surface. The holding frame 15 is disposed in the hydraulic fluid stored in the tank 11 by mounting the projecting ends of the mounting pieces 19 and 20 on the vibration-proof rubber 14 and fixing the mounting screws 16 with the mounting screws 21. . Reference numeral 22 denotes an electric motor,
6 and fixed by mounting screws 23 and immersed in a working fluid. Reference numeral 24 denotes a hydraulic pump driven by the electric motor 22 to suck and discharge the hydraulic fluid, which is integrally connected to the electric motor 22 and immersed in the hydraulic fluid. Reference numeral 25 denotes a suction pipe connected to the hydraulic pump 24, and a strainer 26
have. 27 is a discharge pipe, one end of which is a hydraulic pump 24.
And the other end is connected to a lower portion of a manifold 31 fixed to the upper plate 12 of the tank 11 located above the hydraulic fluid level L1. The discharge pipe 27 has straight pipe sections 29A and 29B made of a flexible member such as a rubber pipe and a resin pipe, and bent pipe sections 30A and 30B made of a rigid member such as a steel pipe and a non-iron pipe.
And provided. 35 is a return pipe, and 36 is a drain pipe, each of which is suspended from the lower surface of the manifold 31 and whose tip is immersed in the working fluid stored in the tank 11.
Reference numeral 32 denotes a discharge port, 33 denotes a return port, and 34 denotes a drain port, which are provided above the manifold 31 so as to be connected to external hydraulic equipment (not shown). The manifold 31 has a space between the discharge pipe 27 and the discharge port 32, a space between the return pipe 35 and the return port 33, and the drain pipe 3.
6 and an internal flow path (not shown) that communicates between the drain port 34. 37 is a partition plate and 38 is an air breather.

Next, the operation of the above configuration will be described. As shown in FIG. 1, the hydraulic pump 24 is driven by the electric motor 22 in a state where the hydraulic pump 24 is immersed in the working fluid stored in the tank 11.
The hydraulic fluid stored in 1 is sucked into the hydraulic pump 24 from the suction pipe 25, flows through the discharge port 32 from the discharge pipe 27, and is supplied to an external hydraulic device (not shown). The hydraulic fluid returned from the hydraulic device is It flows through the return pipe 35 from the return port 33 and flows back into the tank 11.

Even if pressure pulsation occurs in the working fluid discharged from the hydraulic pump 24 by this operation, the bent pipe portion 3 of the discharge pipe 27
Since 0A and 30B are made of rigid members and the radius of curvature does not fluctuate due to the pressure pulsation of the hydraulic fluid discharged from the hydraulic pump 24, the discharge pipe 27 can be prevented from vibrating in the form of the radius of curvature fluctuating, thereby reducing the operation noise. Good reduction can be achieved. Further, the discharge pipe 27 is formed by straight pipe sections 29A, 29B made of a flexible member and bent pipe sections 30A, 3A made of a rigid member.
0B, the flexibility of the flexible member can be maintained without being deteriorated by long-term bending, as compared with a conventional device in which the flexible member is provided in a bent shape to form the discharge pipe. The life of the discharge pipe 27 can be extended, and the durability of the device can be improved.

Now, the rotational speed of the electric motor 22 is 1800 rpm.
m, displacement of hydraulic pump 24 14.5 cm ³ / r
ev, a hydraulic pressure source device having a discharge pressure of 70 kgf / cm ² , wherein a straight tube portion 29A made of a flexible member having a length of 450 mm, a straight tube portion 29B made of a flexible member having a length of 380 mm, and a rigid member are provided. 1 is connected to the hydraulic pump 24 and the other end is fixed to the upper plate 12 of the tank 11. The discharge pipe 27 shown in FIG. The lower part of the manifold 31 was connected, and the acceleration accompanying vibration was measured at the connection point of the discharge pipe 27 with the manifold 31, and it was 0.4 G.
However, with such a hydraulic pressure source device, the length is 850 m.
When an experiment was performed using the conventional discharge pipe 5 shown in FIG. 3 in which m flexible members were provided in a bent shape, the acceleration accompanying vibration was measured to be 1.6 G. As a result, it was found that the acceleration associated with the vibration was reduced to one-fourth of the conventional one.

FIG. 2 shows another embodiment of the present invention, in which the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only different points will be described. The electric motor 40 is erected and fixed on the upper plate 12 of the tank 11, and the hydraulic pump 41 is
And is integrally connected to the lower part of the electric motor 40 so as to hang down in the tank 11. A discharge pipe 42 having one end connected to the hydraulic pump 41 and the other end connected to the lower part of the manifold 31 is provided by being constituted by a straight pipe 43 made of a flexible member and a bent pipe 44 made of a rigid member. It has the same function and effect as the embodiment.

[0012]

As described above, the present invention has a tank in which a hydraulic fluid is formed so as to be able to store therein, and a hydraulic pump for sucking and discharging the hydraulic fluid into the tank and an electric motor for driving the hydraulic pump. One end is connected to the hydraulic pump so that the hydraulic fluid discharged from the hydraulic pump is supplied to the outside of the tank, and the other end is connected to a fixed part on the tank side, and a discharge pipe is provided.
Since the discharge pipe is constituted by a straight pipe section made of a flexible member and a bent pipe section made of a rigid member, the discharge pipe can be prevented from vibrating in a form in which the radius of curvature fluctuates, thereby reducing operating noise. Good reduction can be achieved.

Further, since the discharge pipe is constituted by a straight pipe section made of a flexible member and a bent pipe section made of a rigid member, the discharge pipe is constituted by providing the flexible member in a bent shape. Compared with the conventional device, the flexibility of the flexible member can be maintained without being damaged by long-term bending, so that the discharge pipe can have a long life and the durability of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hydraulic pressure source device showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a hydraulic pressure source device showing another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a hydraulic pressure source device showing a conventional example.

[Explanation of symbols]

 3, 11 tank 1, 22, 40 electric motor 2, 24, 41 hydraulic pump 5, 27, 42 discharge pipe 29A, 29B, 43 discharge pipe part 30A, 30B, 44 bent pipe part L1 liquid level

Claims (1)

(57) [Claims] A hydraulic pump for sucking and discharging the hydraulic fluid and an electric motor for driving the hydraulic pump are integrally provided and arranged in the tank; One end is connected to the hydraulic pump and the other end is connected to a fixed part on the tank side so as to supply the hydraulic fluid discharged from the hydraulic pump to the outside of the tank, and a discharge pipe is provided. The discharge pipe is a straight line made of a flexible member. A hydraulic pressure source device comprising a pipe section and a bent pipe section made of a rigid member.