JP2001355444A - Fan unit for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the attachment and detachment of a motor and a fan to rapidly carry out the maintenance work of a fan unit in a short time. SOLUTION: A drive side coupling member 25 is mounted to a base end side large diameter part 22a of an output shaft 22 of the motor 20, and a fan side coupling member 24 is mounted to a tip side small diameter part 22b. The drive side coupling member 25 is connected to the output shaft 22 so as to be integrally rotated by a key 26, and the drive side coupling member 25 and the fan side coupling member 24 are jointed to each other and detachably connected by connecting bolts 27. The fan side coupling member 24 is fitted to a collar 28 fitted to the small diameter part 22b of the output shaft 22. A stopper plate 29 is provided abutting on the tip face of the collar 28, and the slip-out of the fan side coupling member 24 from the output shaft 22 is prevented by the stopper plate 29. The stopper plate 29 is fixed by a fastening bolt 30 screw-inserted in the tip face of the output shaft 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for cooling a predetermined fluid to be cooled, such as a radiator or an oil cooler, provided on a construction machine or the like. The fan supplies cooling air to the heat exchanger. It concerns the structure of the unit.

[0002]

2. Description of the Related Art As a construction machine, for example, an engine is mounted on a hydraulic shovel, and a hydraulic pump is driven by the engine to operate hydraulic actuators provided at various parts by hydraulic oil supplied from the hydraulic pump. I have to. For this purpose, a radiator for cooling engine cooling water and an oil cooler for cooling return oil from a hydraulic actuator are mounted on the hydraulic shovel. The radiator and the oil cooler are heat exchangers, and have substantially the same configuration. The difference is that the fluid to be cooled is engine cooling water for the radiator and hydraulic oil for the oil cooler.

That is, as shown in FIG. 3, an upper tank 1 into which a fluid to be cooled flows is provided on an upper side, and a lower tank 2 which is an outlet of the cooled fluid to be cooled is provided on a lower side. The heat radiating section 3 is arranged between the upper tank 1 and the lower tank 2. Radiator 3
In the figure, a large number of small tubes 5 are provided in a vertical direction in a frame 4, and a large number of radiation fins 6 are fixed to these small tubes 5. The thin tube 5 allows a fluid to be cooled to flow from the upper tank 1 to the lower tank 2, and allows cooling air to flow through the heat radiating portion 3 to exchange heat with the fluid to be cooled flowing through the small tube 5. .

The heat exchanger 7 configured as described above
As shown in FIG. 4, a fan unit 8 is provided to allow cooling air to flow through the heat radiating section 3. The fan unit 8 includes a fan 9 and a motor 10,
The fan 9 is arranged so as to face the heat radiating section 3,
The motor 10 for driving the fan 9 is constituted by, for example, a hydraulic motor (or an electric motor). The fan 9 and the motor 10 for driving the fan 9 are detachably fixed to a motor bracket 12 serving as a support member connected to a shroud 11 for forming a cooling air flow path. The fan unit 8 includes a motor 10 for driving the fan 9 at regular intervals such as overhaul.
In case of failure, maintenance work must be performed at any time. For this purpose, the motor 10 is detachably attached to the motor bracket 12, and the motor 10 and the fan 9 are configured to be separably connected.

FIG. 5 shows a structure of a conventional mechanism for detachably connecting the fan 9 and the motor 10 to each other. In the figure, a fan 9 includes a rotating block 9a,
The blade 9b is attached to the rotating block 9a with bolts 13 and extends radially. The output shaft 10a of the motor 10 is inserted through a shaft insertion hole 14 formed in the rotary block 9a. And the output shaft 10
a has a stepped shape in which the base end side has a large diameter and the distal end side has a small diameter, and the shaft insertion hole 14 also has an output shaft 10a.
And has a large-diameter portion and a small-diameter portion so as to correspond to.

A key 15 is provided between the large-diameter portion of the output shaft 10a and the large-diameter portion of the shaft insertion hole 14, so that the output shaft 10a and the rotary block 9a cannot be relatively rotated by the key 15. That is, when the output shaft 10a is rotated, the rotation is reliably transmitted to the rotation block 9a. A collar 16 is fitted around the small diameter portion of the output shaft 10a, and the collar 16 is fitted into the small diameter portion of the shaft insertion hole 14 of the rotary block 9a.
Further, a stopper plate 17 is provided in contact with the distal end surface of the output shaft 10a, and the stopper plate 17 is fixed in a state of being in contact with the distal end of the output shaft 10a by a bolt 18 screwed into the output shaft 10a. Have been.

[0007]

When performing maintenance work on the fan unit, the fan 9 and the motor 10 must be separated. To this end, it is necessary to remove the bolt 18 and remove the rotary block 9a constituting the fan 9 from the output shaft 10a. Therefore, the bolt 18 is detached and attached to the output shaft 10a.
Alternatively, the fan 9 and the motor 10 are separated by displacing the rotating block 9a in a direction to separate it from the other party. Here, the work of separating the fan 9 and the motor 10 itself does not involve any particular difficulty. However, after performing the maintenance work, the rotating block 9 of the fan 9
It is extremely difficult to connect a to the output shaft. That is, in order to prevent vibrations or the like from occurring when the fan 9 rotates, the mounting portion between the rotary block 9a, the key 15, and the output shaft 10a has almost no gap. For this reason, when assembling the fan 9 and the motor 10, the three members described above must be aligned very accurately. However, the heat exchanger 7 is disposed in front of the fan unit 8, and the motor bracket 12 connected to the shroud 11 is disposed in the mounting portion of the motor 10, and various surroundings are provided. Since the members are arranged, the rotating block 9a, the key 15, the output shaft 10a
The task of accurately aligning the two with each other becomes extremely difficult. For this reason, there is a problem that an extremely long time is required for maintenance work, and time and labor are wasted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to facilitate the attachment and detachment of a motor and a fan, so that the maintenance work of the fan unit can be performed quickly in a short time. It is to make.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, according to the present invention, a fan is detachably mounted on an output shaft of a motor detachably mounted on a support member, and the fan is mounted on the output shaft by the fan. A cooling air is supplied to the heat radiating portion, and a drive side coupling member and a fan side coupling member are fitted on the output shaft, and the drive side coupling member is provided with the output side. The blade constituting the fan is radially attached to the fan-side coupling member located at the base end side of the shaft, connected to the output shaft so as to be relatively non-rotatable, and located at the distal end side of the output shaft, The two coupling members are detachably connected to each other by a rotation transmitting means, and a retaining means for the coupling members is detachably provided at a tip of the output shaft. Is shall.

The means for connecting the output shaft and the drive-side coupling member so that they cannot rotate relative to each other can be constituted by, for example, a key, a spline, or the like. Further, when the rotation transmitting means is constituted by a connecting bolt attached between the coupling members, the attachment and detachment between the coupling members becomes easy. Further, the output shaft has a stepped structure in which the base end side has a large diameter and the distal end side has a small diameter, the drive side coupling member is fitted to the large diameter portion of the output shaft, and the fan side coupling member is provided. Can be configured to be fitted to a small diameter portion of the output shaft via a collar having a predetermined thickness. In this case, the stopper means is attached to the tip of the output shaft, is joined to the end face of the collar, and has a stopper plate having an outer diameter larger than the fitting portion of the fan-side coupling member to the collar. In order to removably fix the stopper plate, the stopper plate can be constituted by a fixing bolt screwed into the tip end surface of the output shaft.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. Note that the configuration of the heat exchanger itself is not particularly different from that of the above-described conventional technology, and thus illustration and description thereof are omitted.

FIG. 1 shows a state in which the drive side motor 20 and the fan 21 constituting the fan unit are connected to each other, and FIG. 2 shows a state in which the motor 20 is separated from the fan 21. . Here, the output shaft 22 is connected to the motor 20.
The output shaft 22 has a large-diameter portion 22a on the base end side and a small-diameter portion 22b on the front end side. On the other hand, the fan 21 has a predetermined number of blades 23, and each of these blades 23
Is attached to the fan-side coupling member 24, and the blades 2
3 extend radially.

The fan-side coupling member 24 has a shaft insertion hole 24a formed in the center of rotation thereof. The output shaft 22, specifically, the small-diameter portion 22a is formed in the shaft insertion hole 24a.
b is inserted. However, the rotation of the output shaft 22 is not directly transmitted to the fan-side coupling member 24, but is transmitted to the fan-side coupling member 24 via the drive-side coupling member 25. For this purpose, a shaft insertion hole 25a is formed in the drive side coupling member 25, and a key 2 is provided between the large diameter portion 22a of the output shaft 22 and the shaft insertion hole 25a of the drive side coupling member 25.
6 are interposed. With this key 26, the output shaft 2
2 and the drive-side coupling member 25 cannot rotate relative to each other, and when the output shaft 22 rotates, the rotation is reliably transmitted to the drive-side coupling member 25. In addition, in order to eliminate play during the rotation transmission, the large-diameter portion 22a of the output shaft 22 and the drive-side coupling member 25
The fitting portion of the shaft insertion hole 25a and the key 26 is substantially tightly fitted.

Opposing surfaces of the fan-side coupling member 24 and the drive-side coupling member 25 are joint surfaces 24b,
25b. And both coupling members 2
The rotation of the drive-side coupling member 25 can be transmitted to the fan-side coupling member 24 by tightening the connection bolt 27 in a state where the joining surfaces 24b, 25b of the 4, 25 are mutually joined. I have. Therefore, the drive side coupling member 25 is moved from the fan side coupling member 2
The mechanism for transmitting the rotation to 4 is constituted by a connecting bolt 27. To ensure that the rotation is transmitted, the connecting bolt 2
7 is a plurality of points, preferably three points at equal angles (12
0 °) or 4 points (90 °). Moreover, the joint surfaces 24b of the coupling members 24, 25,
25b are joined to each other, so that no excessive load acts on the connecting bolt 27. In order to attach the connection bolt 27, the drive side coupling member 25 has a bolt insertion hole 25c, and the fan side coupling member 24
Is provided with a screw hole 24c. Therefore, the connecting bolt 27 is screwed from the motor 20 side.

A collar 28 is fitted to the small diameter portion 22b of the output shaft 22, and the collar 28 is attached to the small diameter portion 2b.
2b and the large-diameter portion 22a. And
A shaft insertion hole 24a of the fan-side coupling member 24 is fitted into the collar 28. And
To facilitate the fitting of the fan-side coupling member 24 to the collar 28, a slight gap is formed between the collar 28 and the shaft insertion hole 24a. The length of the collar 28 is slightly longer than the length of the shaft insertion hole 24a.

A stopper plate 29 is provided on the distal end surface of the collar 28.
Are provided in contact with each other. The inner diameter of the stopper plate 29 is slightly larger than the outer diameter of the small diameter portion 22 b of the output shaft 22.
It is formed of an annular plate having a hole diameter sufficiently smaller than the outer diameter of the collar 28 and having an outer diameter sufficiently larger than the inner diameter of the shaft insertion hole 24a of the fan-side coupling member 24. A fastening bolt 30 is screwed into the end surface of the output shaft 22, and the head 30 a of the fastening bolt 30 is larger than the hole diameter of the stopper plate 29. Numeral 31 denotes a washer which exerts a function of preventing the fastening bolt 30 from loosening. Therefore, the stopper plate 29 and the fastening bolt 30 for fixing the stopper plate 29 constitute a mechanism for preventing the fan 21 from coming off the output shaft 22 of the motor 20.

The fan unit comprising the motor 20 and the fan 21 is assembled as described above. The motor 20 constituting the fan unit is provided with a motor bracket 32 provided as a support member and connected to a shroud.
Fixed to For this purpose, the motor bracket 32 is provided with a mounting hole 32a, and the motor 20 is provided with a flange portion 20a having a larger diameter than the mounting hole 32a. And fastening means 3 comprising a bolt and nut
3, the flange portion 20a of the motor 20 is detachably attached to the motor bracket 32. Here, the mounting hole 32a formed in the motor bracket 32 must be large enough to allow at least the distal end portion of the motor 20 to be inserted.
5 has an opening diameter that can be inserted.

The present embodiment is constructed as described above. When the motor 20 is operated in the mounted state shown in FIG. 1, the fan 21 rotates, and the heat exchanger is cooled. Can supply wind. That is, the motor 20
When the output shaft 22 rotates, the rotation is transmitted to the drive-side coupling member 25 via the key 26. further,
The rotation of the drive-side coupling member 25 is transmitted to the fan-side coupling member 24 via the connection bolt 27, and the blade 2 provided on the fan-side coupling member 24
3 will rotate. Here, output shaft 22, key 2
6 and the drive-side coupling member 25 are substantially free of a gap, and the joint surfaces 24b and 25b of the coupling members 24 and 25 are in close contact with each other.
Therefore, at the time of transmitting the rotation, there is no play between the output shaft 22 and the drive-side coupling member 25, and the connecting bolt 27 between the coupling members 24, 25 is not deformed. Is transmitted very efficiently.

At the end of the output shaft 22, a stopper plate 29 is fixedly provided, and a fan-side coupling member 24 is provided.
Is substantially clamped between the stopper plate 29 and the step between the small-diameter portion 22b and the large-diameter portion 22a of the output shaft 22, so that the fan-side coupling member 24 is substantially axially displaced. The position does not shift. Further, the drive side coupling member 25 connected to the fan side coupling member 24 by the connection bolt 27 is also prevented from moving in the axial direction. However, when the stopper plate 29 is pressed against the fan-side coupling member 24, a rotational force is applied to the stopper plate 29 by the inertial force of the blades 23 and the fan-side coupling member 24 when the fan 21 starts and stops. Acting, the fastening bolt 30 may be loosened.
However, the stopper plate 29 is pressed against the collar 28 so that a slight gap is formed with respect to the fan-side coupling member 24.
No force is exerted that causes loosening of the body.
Therefore, the fan 21 is connected and held to the output shaft 22 of the motor 20 in an extremely stable state.

The fan unit having the above configuration must perform maintenance work periodically or whenever a failure of the motor 20 occurs. In particular,
When performing maintenance work on the motor 20,
This motor 20 must be removed. To remove the motor 20, first, the connection bolt 27 and the fastening bolt 30 are detached and attached, and the stopper plate 29 is attached to the collar 28.
Away from Thereby, the fan side coupling member 24 and the drive side coupling member 25 are separated,
In addition, the fan-side coupling member 24 can move in the axial direction of the output shaft 22.

In this state, the motor 20 can be detached from the motor bracket 32 by detaching the fastening means 33 composed of a bolt and nut that fixes the flange portion 20a of the motor 20 to the motor bracket 32. . In this state, the motor 20 is moved in a direction to separate the motor 20 from the motor bracket 32, as shown in the direction of the arrow in FIG. Then, the motor 20
With the drive-side coupling member 25 connected to the output shaft 22, the drive-side coupling member 25 is separated from the fan-side coupling member 24 constituting the fan 21 and can be removed from the motor bracket 32. Here, although the drive-side coupling member 25 and the key 26 are not fixed in the axial direction of the output shaft 22, they are tightly fitted to each other and a holding force due to friction acts, so that no particularly large force is applied. As long as they are integral, they can be removed. The collar 28 also has a small diameter portion 2 of the output shaft 22.
The motor 20 can be removed from the motor bracket 32 with the collar 28 attached, if a certain degree of frictional engagement force acts on the 2b and the fitting is performed. However, the collar 28 may be separated at the time of the removal. Although the fan 21 is located between the motor bracket 32 and the heat exchanger, the fan 21 may be supported by an appropriate member, or may be slid horizontally if it does not interfere with the shroud. Can be taken out to the outside. Therefore, fan 2
The maintenance work of 1, for example, operations such as cleaning and screw tightening can be performed smoothly.

As described above, the maintenance work is performed with the motor 20 separated from the motor bracket 32. However, since the drive-side coupling member 25 is not fixed to the output shaft 22, the motor 20 is disassembled. For example, the drive-side coupling member 25 can be separated from the output shaft 22. Motor 20 with motor bracket 3
In a state separated from the drive coupling 2, the drive-side coupling member 25 and the key 26 can be easily attached and detached.

After the maintenance work is completed, if the drive-side coupling member 25 and the key 26 are separated from the output shaft 22 of the motor 20, they are mounted and
The motor 20 is mounted on the motor bracket 32 and assembled with the fan 21.
Here, the connection of the drive-side coupling member 25 and the key 26 to the output shaft 22 is substantially tightly fitted. However, since the assembly thereof can be performed in a completely open space, particular difficulty is involved. Never. The collar 28 is also fitted to the small-diameter portion 22b of the output shaft 22, but this operation can be performed in an open space, so that there is no difficulty in mounting the collar.

The output shaft 22 on which the drive-side coupling member 25 and the key 26 are mounted from the front side of the motor bracket 32 is attached to the mounting hole 32 in the motor bracket 32.
Insert into a. Then, the small diameter portion 22 of the output shaft 22
The collar 28 fitted into the shaft b is inserted into the shaft insertion hole 24a of the fan-side coupling member 24. Here, the collar 28 and the shaft insertion hole 24a of the fan side coupling member 24 are provided.
This fitting operation is extremely easily performed since the fitting portion with the fitting is substantially in a loosely fitted state. In this state,
In order to fix the motor 20 in a stable state, it is desirable that the motor 20 be fixed to the motor bracket 32 by the fastening means 33. However, the motor 20 may be fixed to the motor bracket 32 last.

Next, while the two coupling members 24 and 25 are in the fitted state, the fan side coupling member 24 is rotated by a predetermined angle, so that the screw hole 24c of the fan side coupling member 24 is driven. The axis line coincides with the bolt insertion hole 25c of the coupling member 25. Note that the screw hole 24c is provided for the fan-side coupling member 2.
4, the screw holes 24c and the bolt insertion holes 25c can be easily aligned. Also, this alignment may be performed at only one position. When the drive-side coupling member 25 and the fan-side coupling member 24 are aligned, the connecting bolt 27 is inserted from the bolt insertion hole 25c and screwed into the screw hole 24c. Since it can be performed from the side, the connection bolt 27 can be easily fastened.

Thereafter, the stopper plate 29 is brought into contact with the front end surface of the collar 28, and the fastening bolt 30 is screwed into the front end of the output shaft 22. As a result, the stopper plate 29 is pressed against the distal end surface of the collar 28, and as a result, the fan-side coupling member 24 is fixed so as not to move substantially in the axial direction of the output shaft 22. Further, since the drive side coupling member 25 is connected and fixed to the fan side coupling member 24 by the connection bolt 27, the drive side coupling member 25 is also substantially fixed in the axial direction of the output shaft 22. become.

[0027]

As described above, the present invention has various effects such as easy attachment and detachment of the motor and the fan, and quick maintenance work of the fan unit in a short time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a connecting portion between a motor and a fan constituting a fan unit according to an embodiment of the present invention.

FIG. 2 is a sectional view similar to FIG. 1, showing a state where a motor and a fan are separated.

FIG. 3 is a front view showing an example of a heat exchanger.

FIG. 4 is a side view showing a state where the heat exchanger and the fan unit of FIG. 3 are assembled.

FIG. 5 is a cross-sectional view of a connection portion between a motor and a fan of a conventional fan unit.

[Explanation of symbols]

 Reference Signs List 20 motor 21 fan 22 output shaft 22a large diameter portion 22b small diameter portion 23 blade 24 fan side coupling member 25 drive side coupling member 24a, 25a shaft insertion hole 24b, 25b joint surface 24c screw hole 25c bolt insertion hole 26 key 27 connection Bolt 28 Collar 29 Stopper plate 30 Fixing bolt 32 Motor bracket 32a Mounting hole

Claims (4)

[Claims] 1. A motor in which a fan is removably mounted on an output shaft of a motor removably mounted on a support member, and the fan supplies cooling air to a heat radiating portion of the heat exchanger. The drive-side coupling member and the fan-side coupling member are provided so as to be fitted to each other, and the drive-side coupling member is located on the base end side of the output shaft, and cannot rotate relative to the output shaft. The fan constituting the fan is radially attached to a fan-side coupling member located on the tip end side of the output shaft, and the two coupling members are detachably connected to each other by rotation transmission means. A fan unit for a heat exchanger, wherein a retaining means for the two coupling members is detachably provided at a tip of an output shaft. 2. The fan unit for a heat exchanger according to claim 1, wherein the means for connecting the output shaft and the drive-side coupling member so that they cannot rotate relatively is a key or a spline. 3. A fan unit for a heat exchanger according to claim 1, wherein said rotation transmitting means comprises a connecting bolt attached between said coupling members. 4. The output shaft has a stepped structure in which a base end side has a large diameter and a distal end side has a small diameter. The drive side coupling member is fitted to a large diameter portion of the output shaft. The fan-side coupling member is fitted to a small-diameter portion of the output shaft via a collar having a predetermined thickness, and the retaining means is attached to a tip of the output shaft, and is attached to an end surface of the collar. A stopper plate that has been joined and has an outer diameter larger than a fitting portion of the fan-side coupling member to the collar, and a tip end surface of the output shaft for detachably fixing the stopper plate. 2. A fan unit for a heat exchanger according to claim 1, wherein said fan unit comprises a fastening bolt inserted.