JP2019161848A - Electric motor with cooler - Google Patents

Abstract

To provide an electric motor with a cooler which can inhibit increase of an axial dimension in a structure using a cooler.SOLUTION: An electric motor with a cooler according to one embodiment includes: an electric motor body; a frame covering the electric motor body; a fan which is connected to a rear end of a rotary shaft of the electric motor and disposed outside the frame; a fan cover which is attached to the frame so as to cover the fan; and a cooler which is attached contacting with a ventilation surface of the fan cover and cools a liquid injected into the device with air blown by the fan.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an electric motor including a cooler.

  For example, as disclosed in Patent Document 1, the hydraulic apparatus includes a hydraulic pump that sucks and discharges hydraulic oil stored in an oil tank, and a cooler for cooling the hydraulic oil. The cooler cools the hydraulic oil by blowing air from a fan provided on the motor side that drives the hydraulic pump.

JP, 2006-56929, A

And the axial direction dimension of the said electric motor must be lengthened only by having provided the cooler, and the size of the whole hydraulic apparatus is enlarged.
Therefore, a motor with a cooler that can suppress an increase in axial dimension even in a configuration using a cooler is provided.

The electric motor with a cooler of the embodiment is
An electric motor body,
A frame that covers the motor body;
A fan connected to the rear end of the rotating shaft of the electric motor and disposed outside the frame;
A fan cover attached to the frame so as to cover the fan;
And a cooler which is attached in contact with the ventilation surface of the fan cover and cools the liquid injected into the fan cover by blowing air from the fan.

FIG. 2 is a rear view of the electric motor as viewed from the rear end side according to the first embodiment, and shows a cooler. The figure which shows the packing attached to the ventilation surface of a fan cover Side view showing the structure of the electric motor with a part of the frame cut away In FIG. 3 equivalent figure, the figure which shows the flow of the ventilation by a fan with an arrow Hydraulic device perspective view Front view of hydraulic system The figure which is 2nd Embodiment and shows the packing attached to the ventilation surface of the fan cover Perspective view showing packing

(First embodiment)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 7. FIG. 6 is a perspective view of the hydraulic device, and FIG. 7 is a front view thereof. Hydraulic oil is stored inside the oil tank 1. The oil tank 1 has a substantially rectangular parallelepiped shape in which a first side plate 1A, a second side plate 1B, a third side plate 1C, and a fourth side plate 1 are erected on a bottom plate 1E, and an upper portion is opened. The upper plate 2 closes the upper opening of the oil tank 1 and is detachably attached to the oil tank 1. The electric motor 3 rotationally drives the hydraulic pump 4 and is fixed to the upper plate 2 via two legs 36 and 36 extending along the axial direction of the electric motor 3 and a plurality of buffer members 5.

  The hydraulic pump 4 is fixed to the front surface of the electric motor 3 on the upper plate 2, and the hydraulic oil in the oil tank 1 is sucked from the suction pipe 4 </ b> A by the rotational driving force of the electric motor 3 and discharged from the discharge path 4 </ b> B. The discharge path 4B is connected to an actuator (not shown). The hydraulic oil that has passed through the actuator is returned to the oil tank 1 via the return path 6. The pressure gauge 7 displays the discharge pressure of the hydraulic pump 4, and is connected to the discharge path 4B by the mounting member 7A, and the front face is directed to the first side plate 1A.

  The oil filler member 10 is disposed on the upper plate 2 and forms an oil filler port for supplying hydraulic oil into the oil tank 1. The lid member 11 closes the fuel filler port and is detachably attached to the fuel filler member 10. The oil level gauge 8 is provided in order to visually recognize the storage amount of the hydraulic oil from the front direction, and the back surface direction opposite to the front direction is in contact with the first side plate 1A of the oil tank 1.

  Below the first side plate 1A, there is provided a plug member 12 that detachably closes a discharge port for discharging hydraulic oil. The upper plate 2 is provided with a plurality of hook members 13 for lifting and moving the apparatus. The oil receiver 19 accommodates hydraulic oil leaked from the pump 4 and is detachably attached to the oil tank 1. The oil receiver 19 is provided with two inverted L-shaped tank mounting portions 19A standing on the oil receiving bottom portion 19C, and by attaching the bottom plate 1E to the tank mounting portion 19A, the bottom plate 1E and the oil receiving bottom portion 19C are connected to each other. There is a gap between them.

  A fan cover 35 is disposed on the rear end side of the electric motor 4, and a cooler 41 for cooling the hydraulic oil is disposed in contact with the ventilation surface of the fan cover 35. The oil injection pipe 14 injects drain into the cooler 41 from the hydraulic pump 4, and the oil discharge pipes 15 </ b> L and 15 </ b> R return the drain cooled by the cooler 41 to the tank 1.

  3 to 5 are side views showing the structure of the electric motor 3 with a part of the frame cut away. For convenience of illustration, the reference numerals are assigned to FIGS. A stator 22 is disposed on the inner periphery of the frame 21. The stator 22 includes a stator iron core 22a and a stator winding 22b installed on the iron core 22a. A rotor 23 is disposed inside the stator 22, and the rotor 23 includes a rotor iron core 23a and a squirrel-cage-shaped rotor winding 23b around the iron core 23a. A rotation shaft 24 is inserted through the central portion of the rotor 23 in the axial direction, the left-right direction in the figure.

  Brackets 25 and 26 are coupled to both ends in the axial direction of the frame 21 by a plurality of bolts 27 and 28, respectively. Both end portions 24a and 24b of the rotary shaft 24 are supported by the brackets 25 and 26 via bearings 31 and 32, respectively. Both brackets 25, 26 constitute a housing 33 that encloses an electric motor main body including the stator 22 and the rotor 23 with the frame 21. Both end portions 24 a and 24 b of the rotating shaft 24 protrude outward from the brackets 25 and 26. Further, the above-described leg portion 36 is attached to the lower portion of the housing 33.

  The frame 21 has a large number of fins 21a for heat dissipation, and all the fins 21a project in the radial direction of the frame 21 and extend in the axial direction. One end portion 24a of the rotating shaft 24 is an output shaft, to which a drive mechanism of the hydraulic pump 4 is connected. A fan 34 is attached to the other end 24b. That is, this rotating electrical machine has a fully enclosed outer fan shape.

  In addition, a fan cover 35 that covers the entire fan 34 is coupled to the frame 21 at the end on the fan 34 side. A cooler 41 for cooling the hydraulic oil of the hydraulic device is attached to the ventilation surface of the fan cover 35 so as to be in contact therewith. As shown in FIG. 1, the cooler 41 has a generally rectangular shape, and the left side portion in the figure is an oil injection portion 42, and the right side portion is an oil discharge portion 43. The oil injection pipe 14 is connected to the upper part of the oil injection part 42, and the oil discharge pipe 15 is connected to the upper part of the oil discharge part 43.

  The oil injection part 42 and the oil discharge part 43 are connected by a plurality of oil delivery parts 44 having a flat tubular shape. As a result, the hydraulic oil injected into the oil injection part 42 reaches the oil discharge part 43 via the oil delivery part 44. And between the some oil delivery parts 44, the radiation fin 45 which consists of a zigzag-shaped metal plate is arrange | positioned.

  As shown in FIGS. 3 and 6, the oil injection pipe 14 and the oil discharge pipe 15 are arranged between the fins 21 a of the frame 21 along the axial direction of the electric motor 3, and are led out to the front side of the electric motor 3. Has been. The oil injection pipe 14 is connected to the hydraulic pump 4, and the oil discharge pipe 15 is connected to the oil tank 1. The rear end 36 a of the leg portion 36 of the electric motor 3 extends beyond the attachment position of the fan cover 35 to the lower side of the cooler 41, and the cooler 41 is placed on the leg portion 36, and the leg 37 is supported by a bolt 37. It is fixed to the part 36.

  FIG. 2 shows the ventilation surface 35a of the fan cover 35, and a packing 37 as a buffer member is attached to the center of the ventilation surface 35a with an adhesive or the like. The packing 37 has a circular thin plate shape, and a part of the cooler 41 is in contact with the ventilation surface 35a via the packing 37, so that vibration generated by the electric motor 3 and transmitted to the cooler 41 is attenuated.

  Next, the operation of this embodiment will be described. In FIG.1 and FIG.3, the flow of the hydraulic fluid which passes through the cooler 41 is shown by the arrow. In FIG. 4, the flow of wind generated by the fan 34 is indicated by arrows.

  The hydraulic oil flows from the drain of the hydraulic pump 4 through the oil injection pipe 14 and is injected into the oil injection portion 42 of the cooler 41. The heat of the hydraulic oil is transmitted to the heat radiating fins 45 when passing through the oil delivery part 44, and the air generated by the fan 34 cools the heat radiating fins 45. In this way, the hydraulic oil is cooled. Then, the hydraulic oil returns from the oil discharge portion 43 to the oil tank 1 through the oil discharge pipe 15. In addition, since air blows also to the oil injection part 42 and the oil discharge part 43, oil is cooled also in them.

  Further, between the fins 21a of the frame 21, as shown in FIGS. 3 and 4, there is a path through which the air blown by the fan 34 passes toward the front end side in the axial direction. Accordingly, the hydraulic oil is cooled by the air blowing while flowing through the oil injection pipe 14 and the oil discharge pipe 15. Thereby, cooling efficiency improves.

  As described above, according to the present embodiment, in the electric motor 3 in which the fan 34 is connected to the rear end 24b of the rotary shaft 24, the cooler 41 is disposed in contact with the ventilation surface 35a of the fan cover 35 that covers the fan 34. . The cooler 41 cools the hydraulic oil of the hydraulic pump 4 injected therein by blowing air from the fan 34. Therefore, the axial direction dimension which added the cooler 41 to the electric motor 3 becomes shorter than before, and the whole becomes small.

  And the cooler 41 connects between the oil injection part 42 arrange | positioned on one side, the oil discharge part 43 arrange | positioned on the opposite side, and between the oil injection part 42 and the oil discharge part 43, oil injection In order to send the hydraulic oil injected into the part 42 to the oil discharge part 43, a plurality of oil delivery parts 44 arranged at predetermined intervals and a plurality of oil delivery parts 44 arranged between the plurality of oil delivery parts 44 respectively. The heat dissipating fins 45 are provided. As a result, the hydraulic oil can be efficiently cooled by blowing air from the fan 34. In addition, since the heat dissipating fins 45 have a shape that folds back continuously between the two oil delivery portions 44 sandwiching itself, the oil can be cooled more efficiently.

  Further, since the packing 37 is disposed between the ventilation surface 35a of the fan cover 35 and the cooler 41, even if a configuration in which the cooler 41 is brought into contact with the fan cover 35 is employed, vibration transmitted to the cooler 41 is not affected by the packing 37. Can be attenuated. Further, since the cooler 41 is fixed to the leg portion 36 that is attached to the housing 33 including the frame 21 and whose rear end 36 a extends beyond the attachment position of the fan cover 35, the fan cover 35 is processed. The cooler 41 can be fixed.

  In addition, the oil injection pipe 14 and the oil discharge pipe 15 are arranged along the axial direction of the rotary shaft 24 outside the frame 21 of the electric motor 3 and led out to the front end 24 a side of the rotary shaft 24. Thereby, since hydraulic oil is cooled by ventilation while flowing through the oil injection pipe 14 and the oil discharge pipe 15, the cooling efficiency is further improved.

  In addition, since the hydraulic device is configured to include the oil tank 1 that stores the hydraulic oil therein, the hydraulic pump 4 that sucks and discharges the hydraulic oil, and the electric motor 3 that rotationally drives the hydraulic pump 4, the hydraulic device is Can be configured small.

(Second Embodiment)
7 and 8 show the second embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described. As shown in FIG. 7 corresponding to FIG. 2, a square attachment port 51 b is formed at the center of the ventilation surface 51 a of the fan cover 51 that replaces the fan cover 35. A packing 52 having a square frame shape is attached to the attachment port 51b.

  As shown in FIG. 8, a groove 52a for attachment is formed on the outer periphery of the packing 52, and the packing 52 is attached to the ventilation surface 51a by fitting the groove 52a into the opening of the attachment port 51b. It has been.

  As described above, according to the second embodiment, the attachment port 51b is formed in the central portion of the ventilation surface 51a of the fan cover 51, the square frame-shaped packing 52, the groove portion 52a in the outer peripheral portion, and the opening portion of the attachment port 51b. Fit to fit. If comprised in this way, since the packing 52 does not block the wind which goes to the electric motor 3 side via the cooler 41 and the ventilation surface 51a, hydraulic oil and the electric motor 3 can be cooled efficiently.

(Other embodiments)
The cooler 41 may be rotated 90 degrees so that the oil injection part 42 is positioned on the upper side and the oil discharge part 43 is positioned on the lower side.
The oil discharge pipe 15 may be connected on the upper side of the oil discharge portion 43.
The oil injection pipe 14 and the oil discharge pipe 15 are not necessarily arranged along the frame 21.

The external shape of the cooler need not be limited to a square or a rectangle.
The shape of the radiation fin is not limited to the zigzag shape.
The shape of the packing according to the first embodiment is not limited to a circle but may be other squares or rectangles.
The shape of the packing according to the second embodiment is not limited to a square frame shape, but may be a rectangular frame shape or a circular frame shape.
The cooler is not limited to being fixed to the leg portion 36, and may be fixed to the fan cover 35.
An electric motor is not restricted to what is used for a hydraulic device.
The object to be cooled by the cooler is not limited to oil, but may be any other liquid such as water.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 3 is an electric motor, 4 is a hydraulic pump, 14 is an oil injection pipe, 15 is an oil discharge pipe, 21 is a frame, 21a is a fin, 34 is a fan, 35 is a fan cover, 35a is a ventilation surface, and 36 is a leg. 37 is a packing, 41 is a cooler, 42 is an oil injection part, 43 is an oil discharge part, 44 is an oil delivery part, 45 is a heat radiating fin, 51 is a fan cover, 51a is a ventilation surface, 51b is an attachment port, 52 is Packing 52a indicates a groove.

Claims (8)

An electric motor body,
A frame that covers the motor body;
A fan connected to the rear end of the rotating shaft of the electric motor and disposed outside the frame;
A fan cover attached to the frame so as to cover the fan;
An electric motor with a cooler comprising: a cooler that is attached in contact with the ventilation surface of the fan cover and cools liquid injected into the fan cover by blowing air from the fan.   The electric motor with a cooler according to claim 1, wherein the cooler includes a buffer member at a portion in contact with the fan cover. The ventilation surface includes an attachment port for attaching the buffer member,
The electric motor with a cooler according to claim 2, wherein the shock-absorbing member has a frame shape, has a groove portion for attachment on the outside of the frame, and is attached by fitting the groove portion around the opening of the attachment port.   The electric motor with a cooler according to claim 3, wherein the attachment port is formed so as to be related to a central portion of the ventilation surface. It is attached to the frame for installing the electric motor main body, and includes a leg portion whose rear end extends beyond the attachment position of the fan cover,
The electric motor with a cooler according to any one of claims 1 to 4, wherein the cooler is fixed to the leg portion. The cooler has a rectangular shape,
A liquid injection part disposed on one side;
A liquid discharger disposed on the opposite side of the one side;
A plurality of liquid delivery sections arranged at predetermined intervals to connect between the liquid injection section and the liquid discharge section and to send the liquid injected into the liquid injection section to the liquid discharge section; ,
The electric motor with a cooler according to any one of claims 1 to 5, further comprising a plurality of heat dissipating fins respectively disposed between the plurality of liquid delivery units.   The electric motor with a cooler according to claim 6, wherein the heat dissipating fin has a shape that folds continuously between two liquid delivery parts sandwiching itself. A liquid injection pipe having one end connected to the liquid injection part;
A liquid discharge pipe having one end connected to the liquid discharge portion;
The liquid injection pipe and the liquid discharge pipe are arranged along the axial direction of the rotary shaft outside the frame, and the other end thereof is led out to the front end side of the rotary shaft. 7. An electric motor with a cooler according to 7.

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