JP2000232752A - Motor and fluid pressure-transporting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive motor which can cope with fluid pressure- transporting units of various specifications, and a fluid pressure-transporting unit using the motor. SOLUTION: A motor has output shafts 15 on both sides of its casing 11 and the shafts 15 can be engaged with each other in the direction of rotation, by engaging the end section 15T of one shaft 15 into the end section 15R of the other shaft 15. The end faces of the casing 11 are formed, in such a way that one end face 13P has a flange-like shape so that the end face 13P on be coupled with the other end face 14R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electric motor.
Also, the present invention relates to a fluid pressure feeding unit using a plurality of the electric motors, and is used, for example, as a hydraulic pressure source of a hydraulic elevator.

[0002]

2. Description of the Related Art Conventionally, in hydraulic elevators,
A hydraulic unit for supplying pressure oil for driving is provided. Since hydraulic elevators are often used for houses, it is preferable that the hydraulic unit has low noise and is small in size.

A belt-type hydraulic unit is known as a conventional hydraulic unit. In a belt-type hydraulic unit, the rotational force of an electric motor is transmitted to a pump via a belt. Thereby, the rotor of the pump rotates, and the oil in the oil tank is pumped.

However, there is a problem that the noise of the electric motor is large in the belt-mounted hydraulic unit. There is an oil immersion type hydraulic unit as a low noise hydraulic unit. In an oil immersion type hydraulic unit, an electric motor and a pump are integrated and housed in a housing which also serves as an oil tank. Since the electric motor and the pump rotate in the oil, noise is reduced.

[0005] The size of an oil immersion type hydraulic unit largely depends on the sizes of an electric motor and a pump. In addition, since the rotor portion of the electric motor rotates in oil, a loss is caused. Note that this loss is generally proportional to the cube of the diameter of the rotor portion.

Therefore, in the oil immersion type hydraulic unit, when the size of the electric motor is large, the efficiency is reduced,
In addition, the size of the housing is disadvantageous because the housing needs to be large.

In order to solve this problem, it is conceivable to manufacture an elongated motor having a smaller diameter rotor portion.

[0008]

However, in the above-described elongated motor, the output shaft (rotary shaft) becomes longer, and therefore, the motor is easily bent. Therefore, it is necessary to adopt a special metal or structure so that the output shaft does not bend, which is expensive.

Further, it is necessary to select the output of the electric motor according to the specifications of the hydraulic unit. The output of the motor includes, for example, 11 KW, 15 KW, 18.5 KW, 22 KW,
Since there are many types such as 30KW or 37KW, if various motors are stocked in order to correspond to various specifications of the hydraulic unit, the types and number of the motors become extremely large, which is disadvantageous in terms of cost. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a low-cost motor capable of coping with various types of fluid pumping units and a fluid pumping unit using such a motor. With the goal.

[0011]

An electric motor 1 according to claim 1.
Is a motor having an output shaft 15 provided on both sides of a casing 11 as shown in FIG.
Each end 15T has one end 15T and the other end 1
5R, and has a fitting shape such that the casing 11 can be engaged with each other in the rotation direction. Each of the end faces of the casing 11 is such that one end face 13P is the other end face 14R.
It has a flange shape that can be connected to a.

As shown in FIG. 4, a fluid pressure feeding unit 2 according to a second aspect includes a plurality of electric motors 1A and 1A according to the first aspect.
1B, the end portions are fitted to each other and the end faces are connected to each other, a composite electric motor CM, a pump 22 that is rotationally driven by the composite electric motor CM and pumps the fluid HD, the composite electric motor CM, the pump 22, and And a housing 21 for storing the fluid HD.

The plurality of electric motors 1 can be used as a composite electric motor by connecting a plurality of them in series. The concatenation is
For example, this is performed as follows.

1 to 3, first, the transmission unit 15
T is another motor (hereinafter, referred to as “motor”) configured similarly to the motor 1.
(Referred to as another electric motor). At this time, the key 17 is fitted into the key groove 15RK of another electric motor. Next, the protrusion 13P is fitted into the recess 14R of another electric motor. Finally, Cover-13
And the cover 14 of the other electric motor are fixed by inserting bolts into the through holes 13H and the female screws 14H of the other electric motor and tightening them. Thereby, the electric motor 1
Can be coupled in series with another electric motor to combine the output of the electric motor 1 with the output of the other electric motor.

[0015]

1 is a sectional front view showing a part of a motor 1 according to the present invention, FIG. 2 is a left side view of the motor 1, and FIG. 3 is a right side view of the motor 1. As shown in FIG.

As shown in FIG. 1, the motor 1 comprises a cylindrical casing 12, covers 13, 14, a rotor 16, a bearing 18, and a field winding or a permanent magnet (not shown). The electric motor 1 can be either DC or AC. Cylindrical casing 12 and covers-13, 14
Constitutes the casing 11.

The cover 13 is a flange-shaped member having a substantially square outer shape. The cover 13 has a disc-shaped protrusion 13P for fitting, and a through hole 13 through which the output shaft 15 passes.
J and four through holes 13H for connection by bolts
Is provided.

The cover 14, like the cover 13, is a flange-shaped member having a substantially square outer shape. Hippo-1
4 has a concave portion 14R having a shape to which the protrusion 13P can be fitted, a through hole 14J, and a female screw 14H for connection by a bolt.

The rotor 16 has an output shaft 15 and is driven to rotate about the output shaft 15 by supplying a predetermined power.

The output shaft 15 has one end penetrating through the cover 13 and the other end penetrating through the cover 14. That is,
A rotational output can be obtained on both sides of the casing 11.

The portion of the output shaft 15 that penetrates through the cover 13 has a smaller outer diameter than other portions.
A transmission part 15T is formed. A key groove is provided at the tip of the transmitting portion 15T, and a key 17 is attached thereto.

The output shaft 15 has a transmission groove 15R formed in a portion of the output shaft 15 penetrating the cover 14, so that the transmission portion 15T can be fitted into the output shaft 15 and coupled to each other in the rotation direction. Have been. In addition, a key groove 15RK is provided on the inner peripheral surface of the transmission groove 15R such that the key 17 is just fitted and engages with each other in the rotation direction.

The output shaft 15 is rotatably supported by bearings 18 provided on the cover 13. No bearing is provided on the side of the cover 14, so that the output shaft 15 is not supported on the side of the cover 14. This is because, on the side of the cover 14, the shaft of another electric motor or the hydraulic pump 22 configured in the same manner as the electric motor 1 is connected to the output shaft 15, and they rotate integrally, and the output shaft 15 is connected to the other shaft. This is because it is rotatably supported by the shaft of the electric motor or the hydraulic pump 22. Since the output shaft 15 is not supported by the cover 14, the shaft can be smoothly rotated without being twisted even if the center at the time of connection is slightly displaced. Therefore, the cover 14 is also provided with a bearing,
The centering at the time of connection may be performed with high accuracy.

A plurality of motors 1 having different outputs, for example, three motors of 11 KW, 15 KW, and 18.5 KW are prepared as the motor 1. However, they are the covers-13, 14, the transmission portion 15T, and the transmission groove 15
The shapes of R are the same and can be connected to each other. Therefore, in order to make the output different, the length of the electric motor 1 or the internal structure may be made different.

The plurality of electric motors 1 configured as described above can be used as a composite electric motor by connecting a plurality of them in series. The connection is performed as follows.

1 to 3, first, the transmission unit 15
T is fitted into a transmission groove 15R of another electric motor configured similarly to the electric motor 1. At this time, the key 17 is fitted into the key groove 15RK of another electric motor. Next, the protrusion 13P is fitted into the recess 14R of another electric motor. Finally, the cover 13 and the cover 14 of the other electric motor are fixed by inserting bolts into the through holes 13H and the female screws 14H of the other electric motor and tightening them. Thereby, the electric motor 1 can be coupled in series with another electric motor, and can combine the output of the electric motor 1 with the output of the other electric motor.

When the number of electric motors 1 is three or more, they can be connected in a similar manner.

If three types of motors, 11 KW, 15 KW, and 18.5 KW, are prepared as the motor 1, one of them can be used or a combination of a plurality of types can be used. , 11KW, 15K
W, 18.5KW, 22KW, 30KW, and 37KW
Many types of output can be obtained. Therefore, a large number of types of outputs can be obtained with a small number of types of motors 1, the types of motors 1 to be stocked can be reduced, and the stock load can be reduced as compared with the conventional case.

Next, a specific example of use of such a composite electric motor will be described.

FIG. 4 is a sectional front view showing a part of the hydraulic unit 2 in section, and FIG. 5 is a sectional side view of the hydraulic unit 2.

As shown in FIGS. 4 and 5, the hydraulic unit 2 comprises a casing 21, a composite electric motor CM, a hydraulic pump 2
2, filter 23, hydraulic valve 24, pipelines 25, 26,
27 and a fixing member 28. The casing 21 also serves as an oil tank, and the oil HD is stored in the casing 21. The hydraulic unit 2 is an oil immersion type and is used for a hydraulic elevator or the like.

The composite electric motor CM is the electric motor 1 shown in FIG.
The two electric motors 1A and 1B having the same configuration as
Are connected to each other.

The hydraulic pump 22 has a rotating shaft having a tip portion similar in shape to the transmitting portion 15T of the electric motor 1. This rotation shaft is fitted in the transmission groove 15R of the electric motor 1A. The hydraulic pump 22 uses the bolt 31 to
It is fixed to. A filter 23 is attached to a suction port of the hydraulic pump 22.

The composite electric motor CM and the hydraulic pump 22 are fixed by a fixing member 28 so as to be suspended from the upper wall of the casing 21.

The hydraulic pump 22 is driven to rotate by the composite electric motor CM, and the oil HD sucked through the filter 23
To the outside via a pipe 26, a hydraulic valve 24, and a pipe 27.

According to the above-described embodiment, the composite electric motor CM
Has an output obtained by combining the output of the electric motor 1A and the output of the electric motor 1B, so that it is possible to cope with the hydraulic units 2 of various specifications by using a small number of electric motors 1A and 1B. Moreover, the size in the diameter direction of the electric motors 1A and 1B is not different from the size of the electric motor 1A or the electric motor 1B. Therefore, as is well shown in FIG. 5, the depth dimension of the casing 21 may be small, and the installation area is correspondingly reduced. For the same reason, the height of the casing 21 is also reduced, and the size of the hydraulic unit can be reduced. Thereby, cost reduction can be achieved. Further, since the diameter of the composite electric motor CM is small, the resistance of oil due to the rotation of the rotor 16 is small, and the efficiency can be improved.

When a larger output is required for driving the hydraulic pump 22, the number of motors 1 to be connected may be increased. Even in that case, the size of the composite electric motor CM in the longitudinal direction becomes longer, but the size in the diametrical direction remains unchanged. Therefore, the same effect can be obtained for the same reason as described above.

In the above embodiment, the composite motor C
Although M is applied to the hydraulic unit 2, it can be applied to a pneumatic unit, other units or devices.

In the above embodiment, the configuration, structure, shape, material, number, etc. of the entire electric motor 1 and the hydraulic unit 2 or each part can be changed as appropriate in accordance with the gist of the present invention.

[0040]

According to the present invention, it is possible to provide a low-cost electric motor which can cope with fluid pumping units of various specifications.

According to the second aspect of the present invention, it is possible to reduce the size and cost of the fluid pumping unit.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a part of a motor according to the present invention in section.

FIG. 2 is a left side view of the electric motor.

FIG. 3 is a right side view of the electric motor.

FIG. 4 is a sectional front view showing a part of the hydraulic unit in section.

FIG. 5 is a sectional side view of the hydraulic unit.

[Explanation of symbols]

 1, 1A, 1B Motor 2 Hydraulic unit (fluid pumping unit) 11 Casing 13P Projection 13P (one end surface) 14R Recess 14R (the other end surface) 15 Output shaft 15T Transmission unit (one end) 15R Transmission groove (the other) 21) Casing (housing) 22 Hydraulic pump (pump) CM Compound motor HD Oil (fluid)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02P 7/69 H02P 7/69 F term (Reference) 3F301 BA01 BB03 CA01 3H086 AA27 AB03 AC03 AE02 AE50 5H572 AA09 BB03 5H605 AA07 BB07 CC02 CC10 DD05 GG04 5H607 AA11 BB01 BB14 CC01 CC09 DD01 DD07 DD09 DD19 FF06 FF33 JJ05 JJ06

Claims (2)

[Claims] 1. An electric motor in which output shafts are provided on both sides of a casing, and one end of each of the output shafts is fitted into the other end to engage with each other in a rotational direction. Each of the casings has a flange shape such that one end face can be coupled to the other end face, and Electric motor. 2. A composite electric motor in which a plurality of electric motors according to claim 1 are fitted with each other at said ends and said end faces are connected to each other; a pump driven by said composite electric motor to rotate and pump a fluid; A fluid pumping unit comprising: a composite electric motor, the pump, and a housing for storing the fluid.