JPH0227201Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a hydraulic unit, specifically an oil tank, a hydraulic pump connected to the oil tank via a suction pipe and a drain pipe, and a system for driving the pump. This invention relates to a hydraulic unit equipped with an electric motor.

(Prior Art) In general, this type of hydraulic unit has a problem in that the hydraulic pump and electric motor vibrate during operation, and this vibration is transmitted to the oil tank, causing the tank to vibrate violently and generate large noise.

Therefore, as described in Japanese Utility Model Application Publication No. 52-123297, as shown in FIG. A base plate 55 is fixed via a cushioning material 54, and the pump 50 and the electric motor 51 are supported by the base plate 55. Thus, when the hydraulic unit is used, the cushioning material 54 allows the pump 50, This is intended to reduce noise by suppressing the vibrations of the electric motor 51 from being transmitted to the oil tank 52.

(Problem to be solved by the present invention) However, this conventional one
4 is interposed, the pump 50,
The electric motor 51 is attached to the tank 52, especially the upper lid 5 of the tank 52, which has relatively low rigidity and is easily vibrated.
Since the equipment 50, 5 was directly supported by
Due to the vibration of No. 1, the entire oil tank 52, including the upper lid 53, vibrated violently and produced a large resonance sound, and thus a sufficient noise suppression effect could not be obtained.

On the other hand, as the oil pump 50 is driven, drain oil accumulates inside the casing of the oil pump 50, and this drain oil is generally collected through a drain pipe (not shown).
However, since the drain oil is at a very high temperature, if it is directly returned to the oil tank 52, the drain oil will be returned to the oil tank 52 via the The temperature of the oil inside the pump was becoming high throughout, causing a problem that had an adverse effect on the hydraulic unit.Also, a cooler was installed separately to cool the drain oil, and the drain oil was pumped through the cooler. If the oil is returned to the tank 52, the problem of rising oil temperature can be solved, but
On the other hand, the problem was that the structure of the entire hydraulic unit became complicated.

Further, in the conventional hydraulic unit described above, the pump 50 and the electric motor 5 are mounted on the upper lid 53 of the oil tank 52.
1 is directly fixed via the base plate 55, the size of the hydraulic pump 50 and electric motor 51 may increase due to changes in the hydraulic pump 50 and the electric motor 51 between different models of hydraulic units with different specifications. If the space required for installing these devices differs significantly due to the addition of a control unit (not shown) consisting of a switching valve, etc., the capacity of the oil tank 52 may be changed between these different models. Even if there is no need to do so, the oil tank 5
In many cases, the shape of the oil tank 52 has to be changed between these different models of hydraulic units due to space requirements for installing the equipment on the top surface of the oil tank 52. There was also the problem that the oil tank 52 could not be standardized (standardized) and the manufacturing cost increased overall.

(Means for Solving the Problem) Therefore, the present invention does not support the pump and the electric motor on the oil tank as in the past, but instead provides a separate pedestal made of a hollow pipe member. The oil tank, the pump, and the electric motor are assembled independently from each other, and the drain oil discharged from the pump is made to flow through the inner cavity of the pipe member constituting the pedestal to the oil tank. By making it possible to return the tank, it is possible to reduce noise and also make the tank common between different models (standardization).
In addition, the drain oil can be cooled without the need for a separate cooler. Hydraulic pump 3
In a hydraulic unit equipped with an electric motor 4 for driving the pump 3, a first frame is formed of a hollow pipe member and includes a grounding part 10 and a pair of mounting parts 11, 11 rising from the grounding part 10. 8,
and a pair of first members 13, 13 facing the mounting portions 11, 11 of the first pedestal 8, and each of the first members 1.
A second mount 12 is formed with a pair of second members 14, 14 having receiving parts 15, 15 connecting both ends of 3, 13, and the oil tank 1 is mounted on the first mount 8.
At the same time as supporting the mounting portion 1 of the first pedestal 8
1 and 11, and the second frame 12 is attached to the second frame 12.
While the hydraulic pump 3 and the electric motor 4 are attached to the pedestal 12, the pipe member constituting the first pedestal 8 is provided with an inlet 26 and an outlet 27 that communicate with the inner cavity of the member, and the inlet 26 is The drain outlet 29 of the pump 3 and the outlet 27 are connected to the drain inlet 30 of the tank 1 via first and second drain pipes 71 and 72, respectively, and the pump 3 is connected to the oil tank 1. The drain oil returned through the first and second drain pipes 71 and 72 is made to flow into the inner cavity of the pipe member constituting the first pedestal 8.

(Function) Since it is constructed as described above, when the hydraulic unit is operated, the vibrations of the pump and the electric motor are
After being damped by the pedestal, it is transmitted to the oil tank, so vibration (noise) is suppressed accordingly, and the drain oil discharged from the pump is air-cooled while flowing through the first pedestal. It is possible to suppress the increase in oil temperature in the oil tank, and in addition, even if different models have different pumps and electric motors, the oil tank can be shared by simply changing the second mount.

(Example) Examples of the present invention will be described below based on the drawings.

In the hydraulic unit shown in Figs. 1 and 2, 1
is an oil tank, and a hydraulic pump 3 is connected to the tank 1 via a suction pipe 2.

Further, as will be described in detail later, the oil pump 3 drains drain oil accumulated in the casing of the pump 3 as it is driven through drain pipes (first and second drain pipes 71,
72) to be returned to the oil tank 1.

Further, an electric motor 4 for driving the pump 3 is connected to the hydraulic pump 3.

In addition, in FIGS. 1 and 2, 5 is a discharge pipe provided in the pump 3, and 6 is a discharge pressure gauge.

The oil tank 1 is supported by a first pedestal 8 made of a hollow pipe member, and a second pedestal 12 made of a hollow pipe member to which the pump 3 and the electric motor 4 are attached is supported by the first pedestal 8. The oil tank 1, the pump 3, and the electric motor 4 are supported independently of each other.

Specifically, the oil tank 1 has a substantially rectangular parallelepiped shape, with a flange 9 formed on the outer periphery of the intermediate portion in the height direction.

Further, as described above, the first pedestal 8 is formed by processing a hollow pipe member into a saddle shape, and specifically, as shown in FIGS. 1 to 3, the width of the oil tank 1 is A pair of grounding parts 1 whose length in the direction is slightly longer than l ₁
0, 10, and a pair of attachment parts 1 rising from each end of these grounding parts 10, 10 and connecting the opposing ends of each of these grounding parts 10, 10, respectively.
It consists of 1 and 11. Furthermore, a second mount 12 on which the oil tank 1, the hydraulic pump 3, and the electric motor 4 are mounted is attached to the pair of mounting portions 11, 11.
Horizontal portions 11a, 11a for attaching the and are provided respectively.

Further, the length of the horizontal portions 11a, 11a is approximately equal to the length _l2 of the oil tank 1 in the longitudinal direction,
In addition, the rising height h ₁ of the mounting portions 11, 11 is equal to the height h ₂ of the position where the flange 9 is formed in the oil tank 1.
Thus, as shown in FIGS. 1 and 2, the oil tank 1 is interposed between the pair of mounting parts 11, 11, and the flange part 9 is
The longitudinal portions 9a, 9a of the mounting portions 11, 1
By engaging the horizontal portions 11a, 11a of the oil tank 1, the oil tank 1 is supported by the first frame 8 while floating above the ground surface.

Further, in detail regarding the first pedestal 8, the pedestal 8 includes a pair of symmetrical split pipe members 8a, 8.
b are connected at two points, and among these two connection points, a hollow joint 22 is used at one connection point, and a solid closing joint 23 is used at the other connection point. Further, a pair of cheese joints 24 and 25 are provided on the pipe member at both sides of the closing joint 23, and an inlet 26 and an outlet 27 communicating with the inner cavity of the pipe member are provided.
In this way, a drain passage 28 is formed in the pipe member through which drain oil flows in the direction shown by the solid arrow A in FIGS. 1 to 3.

The inlet 26 is connected to the drain outlet 29 of the oil pump 3 via a first drain pipe 71, and the outlet 27 is connected to the drain inlet 30 of the oil tank 1 via a second drain pipe 72. In this way, the drain oil accumulated in the casing of the pump 3 is allowed to flow through the first drain pipe 71, the drain passage 28, and the second drain pipe 72 as shown by the arrow A. This is done so that it can be returned to the oil tank 1.

Further, the hydraulic pump 3 and the electric motor 4 are arranged above the oil tank 1 supported by the first frame 8 with a space therebetween. and the first pedestal 8
It is attached to the second mount 12 which is attached to the attachment parts 11, 11 of.

Specifically, as shown in FIGS. 1 to 3, the second pedestal 12 is formed by integrally processing a hollow metal pipe (rod-shaped member) into a saddle shape like the first pedestal 8.
A pair of first members 13, 13 facing each of the mounting portions 11, 11, and opposite ends of each of the first members 13, 13 above the oil tank 1 supported by a first frame 8. It consists of a pair of second members 14, 14 connected by detouring, and these second members 14,
Each receiving part 15, 15 to which the electric motor 4 is attached to 14
is formed.

Therefore, the assembly of the equipment to the first pedestal 8 is as follows:
As shown in FIGS. 1 and 2, the lengthwise portions 9a, 9a of the flange 9 of the oil tank 1 are connected to the horizontal portions 11a, 1 of the pair of mounting portions 11, 11.
1a, and this oil tank 1 is placed on the first frame 8.
Next, each first member 13, 13 of the second pedestal 12 is attached to each attachment part 11, 11 (horizontal part 11a, 11) of the first pedestal 8 via the collar part 9.
a) with the flange part 9 of the oil tank 1 interposed between the mounting parts 11, 11 of the first pedestal 8 and each of the first members 13, 13 of the second pedestal 12,
These mounting parts 11, 11, collar part 9, first member 1
3 and 13 are integrally connected by a holder 161 and a bolt 162 as shown in FIG. Thereafter, the electric motor 4 connected to the pump 3 is fixed to the receiving parts 15, 15 of the second frame 12 either directly or via the base plate 17.

The operation of the hydraulic unit constructed as above will be explained.

When the electric motor 4 is started, the pump 3 acts as a pump, sucking oil from the oil tank 1 through the suction pipe 2 and pumping it through the discharge pipe 5. At this time, the pump 3 and the electric motor 4 vibrate violently, but this vibration is attenuated in the process of being transmitted to the second frame 12, and then transmitted to the oil tank 1 via the flange 9.

Therefore, vibrations are less likely to be transmitted to the oil tank 1 compared to the conventional system in which the pump 3 and electric motor 4 are directly supported.

Moreover, since the distance from the vibration sources of the pump 3 and electric motor 4 to the oil tank 1 becomes longer, the vibrations are attenuated.Furthermore, even if the same vibration occurs in the first pedestal 8 made of pipe, this pedestal 8 Because the surface area is smaller, less sound is emitted, resulting in lower noise levels.

Moreover, since the oil tank 1 is supported by the first frame 8 via the flange 9 provided around the entire circumference of the oil tank 1, the peripheral wall 20 of the oil tank 1 is thin. Since the peripheral wall 20 is reinforced by the flange 9, the vibration of the peripheral wall 20 is suppressed, and the vibration of the oil tank 1, and thus the noise, can be further reduced compared to the conventional oil tank.

On the other hand, as the pump 3 is driven, high-temperature drain oil accumulates in the casing of the pump 3, and this drain oil flows through the first drain pipe 71, the drain passage 28 in the first frame 8, Second drain pipe 7
2 and is returned to the oil tank 1. Thus, by circulating the drain oil within the first frame 8, the length of the drain oil flowing is increased, and the drain oil is effectively cooled by the outside air during the circulation process, and as a result, the oil tank 1 This also suppresses the rise in internal oil temperature.

Furthermore, since the first frame 8 is filled with oil, the vibration of the first frame 8 can be reduced by forming the first frame 8 with a hollow pipe member and reducing the weight of the entire unit. In the same way as using a solid member for the first frame 8, it is possible to effectively attenuate.

Furthermore, in the past, the oil tank 1 directly supported the hydraulic pump 3 and the electric motor 4 so that the weight of these devices 3 and 4 was supported by the structure of the oil tank 1; 3,
In order to prevent the circumferential wall 20 of the oil tank 1 from vibrating greatly due to the violent vibrations described in step 4, the circumferential wall 20 of the oil tank 1 is made thicker than originally necessary to store the desired amount of oil. The thickness of the oil tank 1 was increased in order to increase the rigidity of the tank 1, and this resulted in a problem in that the weight of the oil tank 1 increased and the overall weight of the hydraulic unit increased. However, in this embodiment, the oil tank 1 includes the hydraulic pump 3 and the electric motor 4.
The oil tank 1
The thickness of the peripheral wall 20 of the oil tank 1 can be made thinner than in the past, and the weight of the oil tank 1 can be reduced. 8 and 12, as mentioned above, since a lightweight and strong hollow pipe is used, the weight of the entire hydraulic unit can be reduced compared to the conventional one.

Furthermore, the oil tank 1 does not have an oil pump 3 and an electric motor 4 mounted on the top surface of the tank 1 as in the conventional case, but these devices 3 and 4 are mounted on the first mount 8 and the second mount. 12, even in other models of hydraulic units where the sizes of the devices 3 and 4 are changed, as long as there is no capacity problem (insufficiency) in the oil tank 1. The oil tank 1 can be used in common.

Furthermore, by interposing a vibration absorbing material such as rubber between the first mount and the flange of the oil tank and between the flange of the oil tank and the second mount, the vibration-proofing effect can be further improved. Alternatively, a vibration absorbing material such as rubber may be interposed between the motor and the second frame to further damp vibration. Further, the first and second frames 8, 12
A holding member 161 made of an elastic member having a W-shaped cross section as shown in FIG.
may also be used.

(Effects of the Invention) As described above, the present invention includes a first frame 8 which is made of a hollow pipe member and includes a grounding part 10 and a pair of mounting parts 11, 11 rising from the grounding part 10;
and a pair of first members 13, 13 facing the mounting parts 11, 11 of the first pedestal 8, and each of the first members 1
A second frame 12 is formed with a pair of second members 14, 14 having receiving parts 15, 15 connecting both ends of the oil tank 1 to the first frame 8.
At the same time as supporting the mounting portion 1 of the first pedestal 8
1 and 11, and the second frame 12 is attached to the second frame 12.
While the hydraulic pump 3 and the electric motor 4 are attached to the pedestal 12, the pipe member constituting the first pedestal 8 is provided with an inlet 26 and an outlet 27 that communicate with the inner cavity of the member, and the inlet 26 is The drain outlet 29 of the pump 3 and the outlet 27 are connected to the drain inlet 30 of the tank 1 via first and second drain pipes 71 and 72, respectively, and the pump 3 is connected to the oil tank 1. Since the drain oil returned via the first and second drain pipes 71 and 72 is made to flow through the inner cavity of the pipe member constituting the first frame 8, vibrations of the oil tank 1 during operation are reduced. Therefore, the noise can be suppressed and the weight can be reduced compared to the conventional one, and the drain oil of the oil pump 3 is released into the tank 1 by flowing through the hollow pipe member that constitutes the pedestal 8,
Since the drain oil is cooled in this process, it can be cooled without installing a separate cooler, and in addition, the oil tank 1 can be used commonly between different models, and as a result, the oil tank 1 can be standardized. Manufacturing costs can also be reduced.

[Brief explanation of the drawing]

Figure 1 is a front view of the embodiment of the present invention, Figure 2 is a side view of the same, Figure 3 is a perspective view showing the first and second frames of the embodiment, and Figure 4 is the first frame of the embodiment. , an explanatory diagram showing the connection structure between the second mount and the oil tank, FIG. 5 is an explanatory diagram showing the connection structure between the first and second mounts and the oil tank in another embodiment, and FIG. 6 shows the conventional example. FIG. 1... Oil tank, 2... Suction pipe, 3... Hydraulic pump, 4... Electric motor, 8... First mount, 10...
Grounding part, 11...Mounting part, 12...Second frame, 1
3...First member, 14...Second member, 15...Receptacle, 26...Inflow port, 27...Outflow port, 28...
Drain passage, 29... drain outlet, 30... drain inlet, 71... first drain pipe, 72... second drain pipe.

Claims (1)

[Scope of utility model registration request] A hydraulic unit comprising an oil tank 1, a hydraulic pump 3 connected to the tank 1 via a suction pipe 2 and a drain pipe, and an electric motor 4 for driving the pump 3, which is made of a hollow pipe member and has a grounding part 10.
and a pair of mounting parts 1 rising from the grounding part 10.
1, 11, a pair of first members 13, 13 facing the mounting parts 11, 11 of the first mount 8, and both ends of each of the first members 13, 13. A second pedestal 12 having a pair of second members 14, 14 having connecting receiving parts 15, 15 is formed to support the oil tank 1 on the first pedestal 8, and to support the oil tank 1 on the first pedestal 8. The second pedestal 12 is attached to the mounting parts 11, 11 of the pedestal 8, and the hydraulic pump 3 and the electric motor 4 are attached to the second pedestal 12, while the pipe member constituting the first pedestal 8 is attached to the second pedestal 12. An inlet 26 and an outlet 27 communicating with the inner cavity are provided, the inlet 26 being connected to the drain outlet 29 of the pump 3, and the outlet 27 being connected to the drain inlet 30 of the tank 1, respectively. The drain oil, which is connected via two drain pipes 71 and 72 and is returned from the pump 3 to the oil tank 1 via the first and second drain pipes 71 and 72, is transferred to the drain oil constituting the first frame 8. A hydraulic unit characterized in that the fluid flows through the inner cavity of a pipe member.